---------------------------
-What: i2c_adapter.dev
- i2c_adapter.list
+What: i2c_adapter.list
When: July 2007
-Why: Superfluous, given i2c_adapter.class_dev:
- * The "dev" was a stand-in for the physical device node that legacy
- drivers would not have; but now it's almost always present. Any
- remaining legacy drivers must upgrade (they now trigger warnings).
- * The "list" duplicates class device children.
- The delay in removing this is so upgraded lm_sensors and libsensors
- can get deployed. (Removal causes minor changes in the sysfs layout,
- notably the location of the adapter type name and parenting the i2c
- client hardware directly from their controller.)
+Why: Superfluous, this list duplicates the one maintained by the driver
+ core.
Who: Jean Delvare <khali@linux-fr.org>,
David Brownell <dbrownell@users.sourceforge.net>
---------------------------
+What: i2c-ixp2000, i2c-ixp4xx and scx200_i2c drivers
+When: September 2007
+Why: Obsolete. The new i2c-gpio driver replaces all hardware-specific
+ I2C-over-GPIO drivers.
+Who: Jean Delvare <khali@linux-fr.org>
+
+---------------------------
* nForce4 MCP-04 10de:0034
* nForce4 MCP51 10de:0264
* nForce4 MCP55 10de:0368
+ * nForce4 MCP61 10de:03EB
+ * nForce4 MCP65 10de:0446
Datasheet: not publicly available, but seems to be similar to the
AMD-8111 SMBus 2.0 adapter.
-Revision 6, 2005-11-20
+Revision 7, 2007-04-19
Jean Delvare <khali@linux-fr.org>
Greg KH <greg@kroah.com>
Technical changes:
+* [Driver type] Any driver that was relying on i2c-isa has to be
+ converted to a proper isa, platform or pci driver. This is not
+ covered by this guide.
+
* [Includes] Get rid of "version.h" and <linux/i2c-proc.h>.
Includes typically look like that:
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
- #include <linux/i2c-isa.h> /* for ISA drivers */
#include <linux/hwmon.h> /* for hardware monitoring drivers */
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon-vid.h> /* if you need VRM support */
#include <linux/err.h> /* for class registration */
- #include <asm/io.h> /* if you have I/O operations */
Please respect this inclusion order. Some extra headers may be
required for a given driver (e.g. "lm75.h").
sensors mailing list <lm-sensors@lm-sensors.org> by providing a
patch to the Documentation/hwmon/sysfs-interface file.
-* [Attach] For I2C drivers, the attach function should make sure
- that the adapter's class has I2C_CLASS_HWMON (or whatever class is
- suitable for your driver), using the following construct:
+* [Attach] The attach function should make sure that the adapter's
+ class has I2C_CLASS_HWMON (or whatever class is suitable for your
+ driver), using the following construct:
if (!(adapter->class & I2C_CLASS_HWMON))
return 0;
- ISA-only drivers of course don't need this.
Call i2c_probe() instead of i2c_detect().
* [Detect] As mentioned earlier, the flags parameter is gone.
The type_name and client_name strings are replaced by a single
name string, which will be filled with a lowercase, short string.
- In i2c-only drivers, drop the i2c_is_isa_adapter check, it's
- useless. Same for isa-only drivers, as the test would always be
- true. Only hybrid drivers (which are quite rare) still need it.
The labels used for error paths are reduced to the number needed.
It is advised that the labels are given descriptive names such as
exit and exit_free. Don't forget to properly set err before
=============
I2C (pronounce: I squared C) is a protocol developed by Philips. It is a
-slow two-wire protocol (10-400 kHz), but it suffices for many types of
-devices.
+slow two-wire protocol (variable speed, up to 400 kHz), with a high speed
+extension (3.4 MHz). It provides an inexpensive bus for connecting many
+types of devices with infrequent or low bandwidth communications needs.
+I2C is widely used with embedded systems. Some systems use variants that
+don't meet branding requirements, and so are not advertised as being I2C.
-SMBus (System Management Bus) is a subset of the I2C protocol. Many
-modern mainboards have a System Management Bus. There are a lot of
-devices which can be connected to a SMBus; the most notable are modern
-memory chips with EEPROM memories and chips for hardware monitoring.
+SMBus (System Management Bus) is based on the I2C protocol, and is mostly
+a subset of I2C protocols and signaling. Many I2C devices will work on an
+SMBus, but some SMBus protocols add semantics beyond what is required to
+achieve I2C branding. Modern PC mainboards rely on SMBus. The most common
+devices connected through SMBus are RAM modules configured using I2C EEPROMs,
+and hardware monitoring chips.
-Because the SMBus is just a special case of the generalized I2C bus, we
-can simulate the SMBus protocol on plain I2C busses. The reverse is
-regretfully impossible.
+Because the SMBus is mostly a subset of the generalized I2C bus, we can
+use its protocols on many I2C systems. However, there are systems that don't
+meet both SMBus and I2C electrical constraints; and others which can't
+implement all the common SMBus protocol semantics or messages.
Terminology
An Algorithm driver contains general code that can be used for a whole class
of I2C adapters. Each specific adapter driver depends on one algorithm
driver.
+
A Driver driver (yes, this sounds ridiculous, sorry) contains the general
code to access some type of device. Each detected device gets its own
data in the Client structure. Usually, Driver and Client are more closely
in this package. See the lm_sensors project http://www.lm-sensors.nu
for device drivers.
+At this time, Linux only operates I2C (or SMBus) in master mode; you can't
+use these APIs to make a Linux system behave as a slave/device, either to
+speak a custom protocol or to emulate some other device.
+
Included Bus Drivers
====================
This is a small guide for those who want to write kernel drivers for I2C
-or SMBus devices.
+or SMBus devices, using Linux as the protocol host/master (not slave).
To set up a driver, you need to do several things. Some are optional, and
some things can be done slightly or completely different. Use this as a
.driver = {
.name = "foo",
},
+
+ /* iff driver uses driver model ("new style") binding model: */
+ .probe = foo_probe,
+ .remove = foo_remove,
+
+ /* else, driver uses "legacy" binding model: */
.attach_adapter = foo_attach_adapter,
.detach_client = foo_detach_client,
+
+ /* these may be used regardless of the driver binding model */
.shutdown = foo_shutdown, /* optional */
.suspend = foo_suspend, /* optional */
.resume = foo_resume, /* optional */
The name field is the driver name, and must not contain spaces. It
should match the module name (if the driver can be compiled as a module),
although you can use MODULE_ALIAS (passing "foo" in this example) to add
-another name for the module.
+another name for the module. If the driver name doesn't match the module
+name, the module won't be automatically loaded (hotplug/coldplug).
All other fields are for call-back functions which will be explained
below.
struct foo_data {
struct i2c_client client;
- struct semaphore lock; /* For ISA access in `sensors' drivers. */
- int sysctl_id; /* To keep the /proc directory entry for
- `sensors' drivers. */
enum chips type; /* To keep the chips type for `sensors' drivers. */
/* Because the i2c bus is slow, it is often useful to cache the read
information of a chip for some time (for example, 1 or 2 seconds).
It depends of course on the device whether this is really worthwhile
or even sensible. */
- struct semaphore update_lock; /* When we are reading lots of information,
+ struct mutex update_lock; /* When we are reading lots of information,
another process should not update the
below information */
char valid; /* != 0 if the following fields are valid. */
I have found it useful to define foo_read and foo_write function for this.
For some cases, it will be easier to call the i2c functions directly,
but many chips have some kind of register-value idea that can easily
-be encapsulated. Also, some chips have both ISA and I2C interfaces, and
-it useful to abstract from this (only for `sensors' drivers).
+be encapsulated.
The below functions are simple examples, and should not be copied
literally.
return i2c_smbus_write_word_data(client,reg,value);
}
-For sensors code, you may have to cope with ISA registers too. Something
-like the below often works. Note the locking!
-
- int foo_read_value(struct i2c_client *client, u8 reg)
- {
- int res;
- if (i2c_is_isa_client(client)) {
- down(&(((struct foo_data *) (client->data)) -> lock));
- outb_p(reg,client->addr + FOO_ADDR_REG_OFFSET);
- res = inb_p(client->addr + FOO_DATA_REG_OFFSET);
- up(&(((struct foo_data *) (client->data)) -> lock));
- return res;
- } else
- return i2c_smbus_read_byte_data(client,reg);
- }
-
-Writing is done the same way.
-
Probing and attaching
=====================
+The Linux I2C stack was originally written to support access to hardware
+monitoring chips on PC motherboards, and thus it embeds some assumptions
+that are more appropriate to SMBus (and PCs) than to I2C. One of these
+assumptions is that most adapters and devices drivers support the SMBUS_QUICK
+protocol to probe device presence. Another is that devices and their drivers
+can be sufficiently configured using only such probe primitives.
+
+As Linux and its I2C stack became more widely used in embedded systems
+and complex components such as DVB adapters, those assumptions became more
+problematic. Drivers for I2C devices that issue interrupts need more (and
+different) configuration information, as do drivers handling chip variants
+that can't be distinguished by protocol probing, or which need some board
+specific information to operate correctly.
+
+Accordingly, the I2C stack now has two models for associating I2C devices
+with their drivers: the original "legacy" model, and a newer one that's
+fully compatible with the Linux 2.6 driver model. These models do not mix,
+since the "legacy" model requires drivers to create "i2c_client" device
+objects after SMBus style probing, while the Linux driver model expects
+drivers to be given such device objects in their probe() routines.
+
+
+Standard Driver Model Binding ("New Style")
+-------------------------------------------
+
+System infrastructure, typically board-specific initialization code or
+boot firmware, reports what I2C devices exist. For example, there may be
+a table, in the kernel or from the boot loader, identifying I2C devices
+and linking them to board-specific configuration information about IRQs
+and other wiring artifacts, chip type, and so on. That could be used to
+create i2c_client objects for each I2C device.
+
+I2C device drivers using this binding model work just like any other
+kind of driver in Linux: they provide a probe() method to bind to
+those devices, and a remove() method to unbind.
+
+ static int foo_probe(struct i2c_client *client);
+ static int foo_remove(struct i2c_client *client);
+
+Remember that the i2c_driver does not create those client handles. The
+handle may be used during foo_probe(). If foo_probe() reports success
+(zero not a negative status code) it may save the handle and use it until
+foo_remove() returns. That binding model is used by most Linux drivers.
+
+Drivers match devices when i2c_client.driver_name and the driver name are
+the same; this approach is used in several other busses that don't have
+device typing support in the hardware. The driver and module name should
+match, so hotplug/coldplug mechanisms will modprobe the driver.
+
+
+Device Creation (Standard driver model)
+---------------------------------------
+
+If you know for a fact that an I2C device is connected to a given I2C bus,
+you can instantiate that device by simply filling an i2c_board_info
+structure with the device address and driver name, and calling
+i2c_new_device(). This will create the device, then the driver core will
+take care of finding the right driver and will call its probe() method.
+If a driver supports different device types, you can specify the type you
+want using the type field. You can also specify an IRQ and platform data
+if needed.
+
+Sometimes you know that a device is connected to a given I2C bus, but you
+don't know the exact address it uses. This happens on TV adapters for
+example, where the same driver supports dozens of slightly different
+models, and I2C device addresses change from one model to the next. In
+that case, you can use the i2c_new_probed_device() variant, which is
+similar to i2c_new_device(), except that it takes an additional list of
+possible I2C addresses to probe. A device is created for the first
+responsive address in the list. If you expect more than one device to be
+present in the address range, simply call i2c_new_probed_device() that
+many times.
+
+The call to i2c_new_device() or i2c_new_probed_device() typically happens
+in the I2C bus driver. You may want to save the returned i2c_client
+reference for later use.
+
+
+Device Deletion (Standard driver model)
+---------------------------------------
+
+Each I2C device which has been created using i2c_new_device() or
+i2c_new_probed_device() can be unregistered by calling
+i2c_unregister_device(). If you don't call it explicitly, it will be
+called automatically before the underlying I2C bus itself is removed, as a
+device can't survive its parent in the device driver model.
+
+
+Legacy Driver Binding Model
+---------------------------
+
Most i2c devices can be present on several i2c addresses; for some this
is determined in hardware (by soldering some chip pins to Vcc or Ground),
for others this can be changed in software (by writing to specific client
You do not have to use this parameter interface; but don't try to use
function i2c_probe() if you don't.
-NOTE: If you want to write a `sensors' driver, the interface is slightly
- different! See below.
-
-
-Probing classes
----------------
+Probing classes (Legacy model)
+------------------------------
All parameters are given as lists of unsigned 16-bit integers. Lists are
terminated by I2C_CLIENT_END.
without any prefix!
-Attaching to an adapter
------------------------
+Attaching to an adapter (Legacy model)
+--------------------------------------
Whenever a new adapter is inserted, or for all adapters if the driver is
being registered, the callback attach_adapter() is called. Now is the
are already in use (by some other registered client) are skipped.
-The detect client function
---------------------------
+The detect client function (Legacy model)
+-----------------------------------------
The detect client function is called by i2c_probe. The `kind' parameter
contains -1 for a probed detection, 0 for a forced detection, or a positive
number for a forced detection with a chip type forced.
-Below, some things are only needed if this is a `sensors' driver. Those
-parts are between /* SENSORS ONLY START */ and /* SENSORS ONLY END */
-markers.
-
Returning an error different from -ENODEV in a detect function will cause
the detection to stop: other addresses and adapters won't be scanned.
This should only be done on fatal or internal errors, such as a memory
For now, you can ignore the `flags' parameter. It is there for future use.
int foo_detect_client(struct i2c_adapter *adapter, int address,
- unsigned short flags, int kind)
+ int kind)
{
int err = 0;
int i;
- struct i2c_client *new_client;
+ struct i2c_client *client;
struct foo_data *data;
- const char *client_name = ""; /* For non-`sensors' drivers, put the real
- name here! */
+ const char *name = "";
/* Let's see whether this adapter can support what we need.
- Please substitute the things you need here!
- For `sensors' drivers, add `! is_isa &&' to the if statement */
+ Please substitute the things you need here! */
if (!i2c_check_functionality(adapter,I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_WRITE_BYTE))
goto ERROR0;
- /* SENSORS ONLY START */
- const char *type_name = "";
- int is_isa = i2c_is_isa_adapter(adapter);
-
- /* Do this only if the chip can additionally be found on the ISA bus
- (hybrid chip). */
-
- if (is_isa) {
-
- /* Discard immediately if this ISA range is already used */
- /* FIXME: never use check_region(), only request_region() */
- if (check_region(address,FOO_EXTENT))
- goto ERROR0;
-
- /* Probe whether there is anything on this address.
- Some example code is below, but you will have to adapt this
- for your own driver */
-
- if (kind < 0) /* Only if no force parameter was used */ {
- /* We may need long timeouts at least for some chips. */
- #define REALLY_SLOW_IO
- i = inb_p(address + 1);
- if (inb_p(address + 2) != i)
- goto ERROR0;
- if (inb_p(address + 3) != i)
- goto ERROR0;
- if (inb_p(address + 7) != i)
- goto ERROR0;
- #undef REALLY_SLOW_IO
-
- /* Let's just hope nothing breaks here */
- i = inb_p(address + 5) & 0x7f;
- outb_p(~i & 0x7f,address+5);
- if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) {
- outb_p(i,address+5);
- return 0;
- }
- }
- }
-
- /* SENSORS ONLY END */
-
/* OK. For now, we presume we have a valid client. We now create the
client structure, even though we cannot fill it completely yet.
But it allows us to access several i2c functions safely */
goto ERROR0;
}
- new_client = &data->client;
- i2c_set_clientdata(new_client, data);
+ client = &data->client;
+ i2c_set_clientdata(client, data);
- new_client->addr = address;
- new_client->adapter = adapter;
- new_client->driver = &foo_driver;
- new_client->flags = 0;
+ client->addr = address;
+ client->adapter = adapter;
+ client->driver = &foo_driver;
/* Now, we do the remaining detection. If no `force' parameter is used. */
parameter was used. */
if (kind < 0) {
/* The below is of course bogus */
- if (foo_read(new_client,FOO_REG_GENERIC) != FOO_GENERIC_VALUE)
+ if (foo_read(client, FOO_REG_GENERIC) != FOO_GENERIC_VALUE)
goto ERROR1;
}
- /* SENSORS ONLY START */
-
/* Next, specific detection. This is especially important for `sensors'
devices. */
/* Determine the chip type. Not needed if a `force_CHIPTYPE' parameter
was used. */
if (kind <= 0) {
- i = foo_read(new_client,FOO_REG_CHIPTYPE);
+ i = foo_read(client, FOO_REG_CHIPTYPE);
if (i == FOO_TYPE_1)
kind = chip1; /* As defined in the enum */
else if (i == FOO_TYPE_2)
/* Now set the type and chip names */
if (kind == chip1) {
- type_name = "chip1"; /* For /proc entry */
- client_name = "CHIP 1";
+ name = "chip1";
} else if (kind == chip2) {
- type_name = "chip2"; /* For /proc entry */
- client_name = "CHIP 2";
+ name = "chip2";
}
- /* Reserve the ISA region */
- if (is_isa)
- request_region(address,FOO_EXTENT,type_name);
-
- /* SENSORS ONLY END */
-
/* Fill in the remaining client fields. */
- strcpy(new_client->name,client_name);
-
- /* SENSORS ONLY BEGIN */
+ strlcpy(client->name, name, I2C_NAME_SIZE);
data->type = kind;
- /* SENSORS ONLY END */
-
- data->valid = 0; /* Only if you use this field */
- init_MUTEX(&data->update_lock); /* Only if you use this field */
+ mutex_init(&data->update_lock); /* Only if you use this field */
/* Any other initializations in data must be done here too. */
- /* Tell the i2c layer a new client has arrived */
- if ((err = i2c_attach_client(new_client)))
- goto ERROR3;
-
- /* SENSORS ONLY BEGIN */
- /* Register a new directory entry with module sensors. See below for
- the `template' structure. */
- if ((i = i2c_register_entry(new_client, type_name,
- foo_dir_table_template,THIS_MODULE)) < 0) {
- err = i;
- goto ERROR4;
- }
- data->sysctl_id = i;
-
- /* SENSORS ONLY END */
-
/* This function can write default values to the client registers, if
needed. */
- foo_init_client(new_client);
+ foo_init_client(client);
+
+ /* Tell the i2c layer a new client has arrived */
+ if ((err = i2c_attach_client(client)))
+ goto ERROR1;
+
return 0;
/* OK, this is not exactly good programming practice, usually. But it is
very code-efficient in this case. */
- ERROR4:
- i2c_detach_client(new_client);
- ERROR3:
- ERROR2:
- /* SENSORS ONLY START */
- if (is_isa)
- release_region(address,FOO_EXTENT);
- /* SENSORS ONLY END */
ERROR1:
kfree(data);
ERROR0:
}
-Removing the client
-===================
+Removing the client (Legacy model)
+==================================
The detach_client call back function is called when a client should be
removed. It may actually fail, but only when panicking. This code is
int foo_detach_client(struct i2c_client *client)
{
- int err,i;
-
- /* SENSORS ONLY START */
- /* Deregister with the `i2c-proc' module. */
- i2c_deregister_entry(((struct lm78_data *)(client->data))->sysctl_id);
- /* SENSORS ONLY END */
+ int err;
/* Try to detach the client from i2c space */
if ((err = i2c_detach_client(client)))
return err;
- /* HYBRID SENSORS CHIP ONLY START */
- if i2c_is_isa_client(client)
- release_region(client->addr,LM78_EXTENT);
- /* HYBRID SENSORS CHIP ONLY END */
-
kfree(i2c_get_clientdata(client));
return 0;
}
you have to do some initializing. Fortunately, just attaching (registering)
the driver module is usually enough.
- /* Keep track of how far we got in the initialization process. If several
- things have to initialized, and we fail halfway, only those things
- have to be cleaned up! */
- static int __initdata foo_initialized = 0;
-
static int __init foo_init(void)
{
int res;
- printk("foo version %s (%s)\n",FOO_VERSION,FOO_DATE);
if ((res = i2c_add_driver(&foo_driver))) {
printk("foo: Driver registration failed, module not inserted.\n");
- foo_cleanup();
return res;
}
- foo_initialized ++;
return 0;
}
- void foo_cleanup(void)
+ static void __exit foo_cleanup(void)
{
- if (foo_initialized == 1) {
- if ((res = i2c_del_driver(&foo_driver))) {
- printk("foo: Driver registration failed, module not removed.\n");
- return;
- }
- foo_initialized --;
- }
+ i2c_del_driver(&foo_driver);
}
/* Substitute your own name and email address */
MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"
MODULE_DESCRIPTION("Driver for Barf Inc. Foo I2C devices");
+ /* a few non-GPL license types are also allowed */
+ MODULE_LICENSE("GPL");
+
module_init(foo_init);
module_exit(foo_cleanup);
Note that some functions are marked by `__init', and some data structures
-by `__init_data'. Hose functions and structures can be removed after
+by `__initdata'. These functions and structures can be removed after
kernel booting (or module loading) is completed.
Below all general purpose routines are listed, that were not mentioned
before.
- /* This call returns a unique low identifier for each registered adapter,
- * or -1 if the adapter was not registered.
+ /* This call returns a unique low identifier for each registered adapter.
*/
extern int i2c_adapter_id(struct i2c_adapter *adap);
-
-The sensors sysctl/proc interface
-=================================
-
-This section only applies if you write `sensors' drivers.
-
-Each sensors driver creates a directory in /proc/sys/dev/sensors for each
-registered client. The directory is called something like foo-i2c-4-65.
-The sensors module helps you to do this as easily as possible.
-
-The template
-------------
-
-You will need to define a ctl_table template. This template will automatically
-be copied to a newly allocated structure and filled in where necessary when
-you call sensors_register_entry.
-
-First, I will give an example definition.
- static ctl_table foo_dir_table_template[] = {
- { FOO_SYSCTL_FUNC1, "func1", NULL, 0, 0644, NULL, &i2c_proc_real,
- &i2c_sysctl_real,NULL,&foo_func },
- { FOO_SYSCTL_FUNC2, "func2", NULL, 0, 0644, NULL, &i2c_proc_real,
- &i2c_sysctl_real,NULL,&foo_func },
- { FOO_SYSCTL_DATA, "data", NULL, 0, 0644, NULL, &i2c_proc_real,
- &i2c_sysctl_real,NULL,&foo_data },
- { 0 }
- };
-
-In the above example, three entries are defined. They can either be
-accessed through the /proc interface, in the /proc/sys/dev/sensors/*
-directories, as files named func1, func2 and data, or alternatively
-through the sysctl interface, in the appropriate table, with identifiers
-FOO_SYSCTL_FUNC1, FOO_SYSCTL_FUNC2 and FOO_SYSCTL_DATA.
-
-The third, sixth and ninth parameters should always be NULL, and the
-fourth should always be 0. The fifth is the mode of the /proc file;
-0644 is safe, as the file will be owned by root:root.
-
-The seventh and eighth parameters should be &i2c_proc_real and
-&i2c_sysctl_real if you want to export lists of reals (scaled
-integers). You can also use your own function for them, as usual.
-Finally, the last parameter is the call-back to gather the data
-(see below) if you use the *_proc_real functions.
-
-
-Gathering the data
-------------------
-
-The call back functions (foo_func and foo_data in the above example)
-can be called in several ways; the operation parameter determines
-what should be done:
-
- * If operation == SENSORS_PROC_REAL_INFO, you must return the
- magnitude (scaling) in nrels_mag;
- * If operation == SENSORS_PROC_REAL_READ, you must read information
- from the chip and return it in results. The number of integers
- to display should be put in nrels_mag;
- * If operation == SENSORS_PROC_REAL_WRITE, you must write the
- supplied information to the chip. nrels_mag will contain the number
- of integers, results the integers themselves.
-
-The *_proc_real functions will display the elements as reals for the
-/proc interface. If you set the magnitude to 2, and supply 345 for
-SENSORS_PROC_REAL_READ, it would display 3.45; and if the user would
-write 45.6 to the /proc file, it would be returned as 4560 for
-SENSORS_PROC_REAL_WRITE. A magnitude may even be negative!
-
-An example function:
-
- /* FOO_FROM_REG and FOO_TO_REG translate between scaled values and
- register values. Note the use of the read cache. */
- void foo_in(struct i2c_client *client, int operation, int ctl_name,
- int *nrels_mag, long *results)
- {
- struct foo_data *data = client->data;
- int nr = ctl_name - FOO_SYSCTL_FUNC1; /* reduce to 0 upwards */
-
- if (operation == SENSORS_PROC_REAL_INFO)
- *nrels_mag = 2;
- else if (operation == SENSORS_PROC_REAL_READ) {
- /* Update the readings cache (if necessary) */
- foo_update_client(client);
- /* Get the readings from the cache */
- results[0] = FOO_FROM_REG(data->foo_func_base[nr]);
- results[1] = FOO_FROM_REG(data->foo_func_more[nr]);
- results[2] = FOO_FROM_REG(data->foo_func_readonly[nr]);
- *nrels_mag = 2;
- } else if (operation == SENSORS_PROC_REAL_WRITE) {
- if (*nrels_mag >= 1) {
- /* Update the cache */
- data->foo_base[nr] = FOO_TO_REG(results[0]);
- /* Update the chip */
- foo_write_value(client,FOO_REG_FUNC_BASE(nr),data->foo_base[nr]);
- }
- if (*nrels_mag >= 2) {
- /* Update the cache */
- data->foo_more[nr] = FOO_TO_REG(results[1]);
- /* Update the chip */
- foo_write_value(client,FOO_REG_FUNC_MORE(nr),data->foo_more[nr]);
- }
- }
- }
L: linux-kernel@vger.kernel.org
S: Maintained
+BLACKFIN I2C TWI DRIVER
+P: Sonic Zhang
+M: sonic.zhang@analog.com
+L: uclinux-dist-devel@blackfin.uclinux.org (subscribers-only)
+W: http://blackfin.uclinux.org/
+S: Supported
+
BLOCK LAYER
P: Jens Axboe
M: axboe@kernel.dk
W: http://www.icp-vortex.com/
S: Supported
+GENERIC GPIO I2C DRIVER
+P: Haavard Skinnemoen
+M: hskinnemoen@atmel.com
+S: Supported
+
GENERIC HDLC DRIVER, N2, C101, PCI200SYN and WANXL DRIVERS
P: Krzysztof Halasa
M: khc@pm.waw.pl
T: quilt http://khali.linux-fr.org/devel/linux-2.6/jdelvare-i2c/
S: Maintained
+I2C-TINY-USB DRIVER
+P: Till Harbaum
+M: till@harbaum.org
+L: i2c@lm-sensors.org
+T: http://www.harbaum.org/till/i2c_tiny_usb
+S: Maintained
+
i386 BOOT CODE
P: Riley H. Williams
M: Riley@Williams.Name
#include <linux/cpufreq.h>
#include <linux/init.h>
#include <linux/sysdev.h>
-#include <linux/i2c.h>
#include <linux/hardirq.h>
#include <asm/prom.h>
#include <asm/machdep.h>
obj-$(CONFIG_INPUT) += input/
obj-$(CONFIG_I2O) += message/
obj-$(CONFIG_RTC_LIB) += rtc/
-obj-$(CONFIG_I2C) += i2c/
+obj-y += i2c/
obj-$(CONFIG_W1) += w1/
obj-$(CONFIG_HWMON) += hwmon/
obj-$(CONFIG_PHONE) += telephony/
# I2C subsystem configuration
#
-menu "I2C support"
-
-config I2C
+menuconfig I2C
tristate "I2C support"
---help---
I2C (pronounce: I-square-C) is a slow serial bus protocol used in
This I2C support can also be built as a module. If so, the module
will be called i2c-core.
+if I2C
+
+config I2C_BOARDINFO
+ boolean
+ default y
+
config I2C_CHARDEV
tristate "I2C device interface"
- depends on I2C
help
Say Y here to use i2c-* device files, usually found in the /dev
directory on your system. They make it possible to have user-space
config I2C_DEBUG_CORE
bool "I2C Core debugging messages"
- depends on I2C
help
Say Y here if you want the I2C core to produce a bunch of debug
messages to the system log. Select this if you are having a
config I2C_DEBUG_ALGO
bool "I2C Algorithm debugging messages"
- depends on I2C
help
Say Y here if you want the I2C algorithm drivers to produce a bunch
of debug messages to the system log. Select this if you are having
config I2C_DEBUG_BUS
bool "I2C Bus debugging messages"
- depends on I2C
help
Say Y here if you want the I2C bus drivers to produce a bunch of
debug messages to the system log. Select this if you are having
config I2C_DEBUG_CHIP
bool "I2C Chip debugging messages"
- depends on I2C
help
Say Y here if you want the I2C chip drivers to produce a bunch of
debug messages to the system log. Select this if you are having
a problem with I2C support and want to see more of what is going
on.
-endmenu
-
+endif # I2C
# Makefile for the i2c core.
#
+obj-$(CONFIG_I2C_BOARDINFO) += i2c-boardinfo.o
obj-$(CONFIG_I2C) += i2c-core.o
obj-$(CONFIG_I2C_CHARDEV) += i2c-dev.o
obj-y += busses/ chips/ algos/
#
menu "I2C Algorithms"
- depends on I2C
config I2C_ALGOBIT
tristate "I2C bit-banging interfaces"
- depends on I2C
help
This allows you to use a range of I2C adapters called bit-banging
adapters. Say Y if you own an I2C adapter belonging to this class
config I2C_ALGOPCF
tristate "I2C PCF 8584 interfaces"
- depends on I2C
help
This allows you to use a range of I2C adapters called PCF adapters.
Say Y if you own an I2C adapter belonging to this class and then say
config I2C_ALGOPCA
tristate "I2C PCA 9564 interfaces"
- depends on I2C
help
This allows you to use a range of I2C adapters called PCA adapters.
Say Y if you own an I2C adapter belonging to this class and then say
config I2C_ALGO8XX
tristate "MPC8xx CPM I2C interface"
- depends on 8xx && I2C
+ depends on 8xx
config I2C_ALGO_SGI
tristate "I2C SGI interfaces"
- depends on I2C && (SGI_IP22 || SGI_IP32 || X86_VISWS)
+ depends on SGI_IP22 || SGI_IP32 || X86_VISWS
help
Supports the SGI interfaces like the ones found on SGI Indy VINO
or SGI O2 MACE.
/* ----- global defines ----------------------------------------------- */
-#define DEB(x) if (i2c_debug>=1) x;
-#define DEB2(x) if (i2c_debug>=2) x;
-#define DEBSTAT(x) if (i2c_debug>=3) x; /* print several statistical values*/
-#define DEBPROTO(x) if (i2c_debug>=9) { x; }
- /* debug the protocol by showing transferred bits */
+#ifdef DEBUG
+#define bit_dbg(level, dev, format, args...) \
+ do { \
+ if (i2c_debug >= level) \
+ dev_dbg(dev, format, ##args); \
+ } while (0)
+#else
+#define bit_dbg(level, dev, format, args...) \
+ do {} while (0)
+#endif /* DEBUG */
/* ----- global variables --------------------------------------------- */
-/* module parameters:
- */
-static int i2c_debug;
static int bit_test; /* see if the line-setting functions work */
+module_param(bit_test, bool, 0);
+MODULE_PARM_DESC(bit_test, "Test the lines of the bus to see if it is stuck");
+
+#ifdef DEBUG
+static int i2c_debug = 1;
+module_param(i2c_debug, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(i2c_debug,
+ "debug level - 0 off; 1 normal; 2 verbose; 3 very verbose");
+#endif
/* --- setting states on the bus with the right timing: --------------- */
static inline void sdalo(struct i2c_algo_bit_data *adap)
{
setsda(adap,0);
- udelay(adap->udelay);
+ udelay((adap->udelay + 1) / 2);
}
static inline void sdahi(struct i2c_algo_bit_data *adap)
{
setsda(adap,1);
- udelay(adap->udelay);
+ udelay((adap->udelay + 1) / 2);
}
static inline void scllo(struct i2c_algo_bit_data *adap)
{
setscl(adap,0);
- udelay(adap->udelay);
+ udelay(adap->udelay / 2);
}
/*
}
cond_resched();
}
- DEBSTAT(printk(KERN_DEBUG "needed %ld jiffies\n", jiffies-start));
+#ifdef DEBUG
+ if (jiffies != start && i2c_debug >= 3)
+ pr_debug("i2c-algo-bit: needed %ld jiffies for SCL to go "
+ "high\n", jiffies - start);
+#endif
done:
udelay(adap->udelay);
static void i2c_start(struct i2c_algo_bit_data *adap)
{
/* assert: scl, sda are high */
- DEBPROTO(printk("S "));
- sdalo(adap);
+ setsda(adap, 0);
+ udelay(adap->udelay);
scllo(adap);
}
static void i2c_repstart(struct i2c_algo_bit_data *adap)
{
- /* scl, sda may not be high */
- DEBPROTO(printk(" Sr "));
- setsda(adap,1);
+ /* assert: scl is low */
+ sdahi(adap);
sclhi(adap);
-
- sdalo(adap);
+ setsda(adap, 0);
+ udelay(adap->udelay);
scllo(adap);
}
static void i2c_stop(struct i2c_algo_bit_data *adap)
{
- DEBPROTO(printk("P\n"));
/* assert: scl is low */
sdalo(adap);
sclhi(adap);
- sdahi(adap);
+ setsda(adap, 1);
+ udelay(adap->udelay);
}
* 0 if the device did not ack
* -ETIMEDOUT if an error occurred (while raising the scl line)
*/
-static int i2c_outb(struct i2c_adapter *i2c_adap, char c)
+static int i2c_outb(struct i2c_adapter *i2c_adap, unsigned char c)
{
int i;
int sb;
/* assert: scl is low */
for ( i=7 ; i>=0 ; i-- ) {
- sb = c & ( 1 << i );
+ sb = (c >> i) & 1;
setsda(adap,sb);
- udelay(adap->udelay);
- DEBPROTO(printk(KERN_DEBUG "%d",sb!=0));
+ udelay((adap->udelay + 1) / 2);
if (sclhi(adap)<0) { /* timed out */
- sdahi(adap); /* we don't want to block the net */
- DEB2(printk(KERN_DEBUG " i2c_outb: 0x%02x, timeout at bit #%d\n", c&0xff, i));
+ bit_dbg(1, &i2c_adap->dev, "i2c_outb: 0x%02x, "
+ "timeout at bit #%d\n", (int)c, i);
return -ETIMEDOUT;
};
/* do arbitration here:
* if ( sb && ! getsda(adap) ) -> ouch! Get out of here.
*/
- setscl(adap, 0 );
- udelay(adap->udelay);
+ scllo(adap);
}
sdahi(adap);
if (sclhi(adap)<0){ /* timeout */
- DEB2(printk(KERN_DEBUG " i2c_outb: 0x%02x, timeout at ack\n", c&0xff));
- return -ETIMEDOUT;
+ bit_dbg(1, &i2c_adap->dev, "i2c_outb: 0x%02x, "
+ "timeout at ack\n", (int)c);
+ return -ETIMEDOUT;
};
/* read ack: SDA should be pulled down by slave */
- ack=getsda(adap); /* ack: sda is pulled low ->success. */
- DEB2(printk(KERN_DEBUG " i2c_outb: 0x%02x , getsda() = %d\n", c & 0xff, ack));
+ ack = !getsda(adap); /* ack: sda is pulled low -> success */
+ bit_dbg(2, &i2c_adap->dev, "i2c_outb: 0x%02x %s\n", (int)c,
+ ack ? "A" : "NA");
- DEBPROTO( printk(KERN_DEBUG "[%2.2x]",c&0xff) );
- DEBPROTO(if (0==ack){ printk(KERN_DEBUG " A ");} else printk(KERN_DEBUG " NA ") );
scllo(adap);
- return 0==ack; /* return 1 if device acked */
+ return ack;
/* assert: scl is low (sda undef) */
}
sdahi(adap);
for (i=0;i<8;i++) {
if (sclhi(adap)<0) { /* timeout */
- DEB2(printk(KERN_DEBUG " i2c_inb: timeout at bit #%d\n", 7-i));
+ bit_dbg(1, &i2c_adap->dev, "i2c_inb: timeout at bit "
+ "#%d\n", 7 - i);
return -ETIMEDOUT;
};
indata *= 2;
if ( getsda(adap) )
indata |= 0x01;
- scllo(adap);
+ setscl(adap, 0);
+ udelay(i == 7 ? adap->udelay / 2 : adap->udelay);
}
/* assert: scl is low */
- DEB2(printk(KERN_DEBUG "i2c_inb: 0x%02x\n", indata & 0xff));
-
- DEBPROTO(printk(KERN_DEBUG " 0x%02x", indata & 0xff));
- return (int) (indata & 0xff);
+ return indata;
}
/*
int scl,sda;
if (adap->getscl==NULL)
- printk(KERN_INFO "i2c-algo-bit.o: Testing SDA only, "
- "SCL is not readable.\n");
+ pr_info("%s: Testing SDA only, SCL is not readable\n", name);
sda=getsda(adap);
scl=(adap->getscl==NULL?1:getscl(adap));
- printk(KERN_DEBUG "i2c-algo-bit.o: (0) scl=%d, sda=%d\n",scl,sda);
if (!scl || !sda ) {
- printk(KERN_WARNING "i2c-algo-bit.o: %s seems to be busy.\n", name);
+ printk(KERN_WARNING "%s: bus seems to be busy\n", name);
goto bailout;
}
sdalo(adap);
sda=getsda(adap);
scl=(adap->getscl==NULL?1:getscl(adap));
- printk(KERN_DEBUG "i2c-algo-bit.o: (1) scl=%d, sda=%d\n",scl,sda);
if ( 0 != sda ) {
- printk(KERN_WARNING "i2c-algo-bit.o: SDA stuck high!\n");
+ printk(KERN_WARNING "%s: SDA stuck high!\n", name);
goto bailout;
}
if ( 0 == scl ) {
- printk(KERN_WARNING "i2c-algo-bit.o: SCL unexpected low "
- "while pulling SDA low!\n");
+ printk(KERN_WARNING "%s: SCL unexpected low "
+ "while pulling SDA low!\n", name);
goto bailout;
}
sdahi(adap);
sda=getsda(adap);
scl=(adap->getscl==NULL?1:getscl(adap));
- printk(KERN_DEBUG "i2c-algo-bit.o: (2) scl=%d, sda=%d\n",scl,sda);
if ( 0 == sda ) {
- printk(KERN_WARNING "i2c-algo-bit.o: SDA stuck low!\n");
+ printk(KERN_WARNING "%s: SDA stuck low!\n", name);
goto bailout;
}
if ( 0 == scl ) {
- printk(KERN_WARNING "i2c-algo-bit.o: SCL unexpected low "
- "while pulling SDA high!\n");
+ printk(KERN_WARNING "%s: SCL unexpected low "
+ "while pulling SDA high!\n", name);
goto bailout;
}
scllo(adap);
sda=getsda(adap);
scl=(adap->getscl==NULL?0:getscl(adap));
- printk(KERN_DEBUG "i2c-algo-bit.o: (3) scl=%d, sda=%d\n",scl,sda);
if ( 0 != scl ) {
- printk(KERN_WARNING "i2c-algo-bit.o: SCL stuck high!\n");
+ printk(KERN_WARNING "%s: SCL stuck high!\n", name);
goto bailout;
}
if ( 0 == sda ) {
- printk(KERN_WARNING "i2c-algo-bit.o: SDA unexpected low "
- "while pulling SCL low!\n");
+ printk(KERN_WARNING "%s: SDA unexpected low "
+ "while pulling SCL low!\n", name);
goto bailout;
}
sclhi(adap);
sda=getsda(adap);
scl=(adap->getscl==NULL?1:getscl(adap));
- printk(KERN_DEBUG "i2c-algo-bit.o: (4) scl=%d, sda=%d\n",scl,sda);
if ( 0 == scl ) {
- printk(KERN_WARNING "i2c-algo-bit.o: SCL stuck low!\n");
+ printk(KERN_WARNING "%s: SCL stuck low!\n", name);
goto bailout;
}
if ( 0 == sda ) {
- printk(KERN_WARNING "i2c-algo-bit.o: SDA unexpected low "
- "while pulling SCL high!\n");
+ printk(KERN_WARNING "%s: SDA unexpected low "
+ "while pulling SCL high!\n", name);
goto bailout;
}
- printk(KERN_INFO "i2c-algo-bit.o: %s passed test.\n",name);
+ pr_info("%s: Test OK\n", name);
return 0;
bailout:
sdahi(adap);
int i,ret = -1;
for (i=0;i<=retries;i++) {
ret = i2c_outb(i2c_adap,addr);
- if (ret==1)
- break; /* success! */
- i2c_stop(adap);
- udelay(5/*adap->udelay*/);
- if (i==retries) /* no success */
+ if (ret == 1 || i == retries)
break;
- i2c_start(adap);
+ bit_dbg(3, &i2c_adap->dev, "emitting stop condition\n");
+ i2c_stop(adap);
udelay(adap->udelay);
+ yield();
+ bit_dbg(3, &i2c_adap->dev, "emitting start condition\n");
+ i2c_start(adap);
}
- DEB2(if (i)
- printk(KERN_DEBUG "i2c-algo-bit.o: Used %d tries to %s client at 0x%02x : %s\n",
- i+1, addr & 1 ? "read" : "write", addr>>1,
- ret==1 ? "success" : ret==0 ? "no ack" : "failed, timeout?" )
- );
+ if (i && ret)
+ bit_dbg(1, &i2c_adap->dev, "Used %d tries to %s client at "
+ "0x%02x: %s\n", i + 1,
+ addr & 1 ? "read from" : "write to", addr >> 1,
+ ret == 1 ? "success" : "failed, timeout?");
return ret;
}
static int sendbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
{
- struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
- char c;
- const char *temp = msg->buf;
+ const unsigned char *temp = msg->buf;
int count = msg->len;
unsigned short nak_ok = msg->flags & I2C_M_IGNORE_NAK;
int retval;
int wrcount=0;
while (count > 0) {
- c = *temp;
- DEB2(dev_dbg(&i2c_adap->dev, "sendbytes: writing %2.2X\n", c&0xff));
- retval = i2c_outb(i2c_adap,c);
+ retval = i2c_outb(i2c_adap, *temp);
if ((retval>0) || (nak_ok && (retval==0))) { /* ok or ignored NAK */
count--;
temp++;
wrcount++;
} else { /* arbitration or no acknowledge */
dev_err(&i2c_adap->dev, "sendbytes: error - bailout.\n");
- i2c_stop(adap);
return (retval<0)? retval : -EFAULT;
/* got a better one ?? */
}
int inval;
int rdcount=0; /* counts bytes read */
struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
- char *temp = msg->buf;
+ unsigned char *temp = msg->buf;
int count = msg->len;
while (count > 0) {
*temp = inval;
rdcount++;
} else { /* read timed out */
- printk(KERN_ERR "i2c-algo-bit.o: readbytes: i2c_inb timed out.\n");
break;
}
temp++;
count--;
- if (msg->flags & I2C_M_NO_RD_ACK)
+ if (msg->flags & I2C_M_NO_RD_ACK) {
+ bit_dbg(2, &i2c_adap->dev, "i2c_inb: 0x%02x\n",
+ inval);
continue;
-
- if ( count > 0 ) { /* send ack */
- sdalo(adap);
- DEBPROTO(printk(" Am "));
- } else {
- sdahi(adap); /* neg. ack on last byte */
- DEBPROTO(printk(" NAm "));
}
+
+ /* assert: sda is high */
+ if (count) /* send ack */
+ setsda(adap, 0);
+ udelay((adap->udelay + 1) / 2);
+ bit_dbg(2, &i2c_adap->dev, "i2c_inb: 0x%02x %s\n", inval,
+ count ? "A" : "NA");
if (sclhi(adap)<0) { /* timeout */
- sdahi(adap);
- printk(KERN_ERR "i2c-algo-bit.o: readbytes: Timeout at ack\n");
+ dev_err(&i2c_adap->dev, "readbytes: timeout at ack\n");
return -ETIMEDOUT;
};
scllo(adap);
- sdahi(adap);
+
+ /* Some SMBus transactions require that we receive the
+ transaction length as the first read byte. */
+ if (rdcount == 1 && (msg->flags & I2C_M_RECV_LEN)) {
+ if (inval <= 0 || inval > I2C_SMBUS_BLOCK_MAX) {
+ dev_err(&i2c_adap->dev, "readbytes: invalid "
+ "block length (%d)\n", inval);
+ return -EREMOTEIO;
+ }
+ /* The original count value accounts for the extra
+ bytes, that is, either 1 for a regular transaction,
+ or 2 for a PEC transaction. */
+ count += inval;
+ msg->len += inval;
+ }
}
return rdcount;
}
if ( (flags & I2C_M_TEN) ) {
/* a ten bit address */
addr = 0xf0 | (( msg->addr >> 7) & 0x03);
- DEB2(printk(KERN_DEBUG "addr0: %d\n",addr));
+ bit_dbg(2, &i2c_adap->dev, "addr0: %d\n", addr);
/* try extended address code...*/
ret = try_address(i2c_adap, addr, retries);
if ((ret != 1) && !nak_ok) {
- printk(KERN_ERR "died at extended address code.\n");
+ dev_err(&i2c_adap->dev,
+ "died at extended address code\n");
return -EREMOTEIO;
}
/* the remaining 8 bit address */
ret = i2c_outb(i2c_adap,msg->addr & 0x7f);
if ((ret != 1) && !nak_ok) {
/* the chip did not ack / xmission error occurred */
- printk(KERN_ERR "died at 2nd address code.\n");
+ dev_err(&i2c_adap->dev, "died at 2nd address code\n");
return -EREMOTEIO;
}
if ( flags & I2C_M_RD ) {
+ bit_dbg(3, &i2c_adap->dev, "emitting repeated "
+ "start condition\n");
i2c_repstart(adap);
/* okay, now switch into reading mode */
addr |= 0x01;
ret = try_address(i2c_adap, addr, retries);
if ((ret!=1) && !nak_ok) {
- printk(KERN_ERR "died at extended address code.\n");
+ dev_err(&i2c_adap->dev,
+ "died at repeated address code\n");
return -EREMOTEIO;
}
}
int i,ret;
unsigned short nak_ok;
+ bit_dbg(3, &i2c_adap->dev, "emitting start condition\n");
i2c_start(adap);
for (i=0;i<num;i++) {
pmsg = &msgs[i];
nak_ok = pmsg->flags & I2C_M_IGNORE_NAK;
if (!(pmsg->flags & I2C_M_NOSTART)) {
if (i) {
+ bit_dbg(3, &i2c_adap->dev, "emitting "
+ "repeated start condition\n");
i2c_repstart(adap);
}
ret = bit_doAddress(i2c_adap, pmsg);
if ((ret != 0) && !nak_ok) {
- DEB2(printk(KERN_DEBUG "i2c-algo-bit.o: NAK from device addr %2.2x msg #%d\n"
- ,msgs[i].addr,i));
- return (ret<0) ? ret : -EREMOTEIO;
+ bit_dbg(1, &i2c_adap->dev, "NAK from "
+ "device addr 0x%02x msg #%d\n",
+ msgs[i].addr, i);
+ goto bailout;
}
}
if (pmsg->flags & I2C_M_RD ) {
/* read bytes into buffer*/
ret = readbytes(i2c_adap, pmsg);
- DEB2(printk(KERN_DEBUG "i2c-algo-bit.o: read %d bytes.\n",ret));
- if (ret < pmsg->len ) {
- return (ret<0)? ret : -EREMOTEIO;
+ if (ret >= 1)
+ bit_dbg(2, &i2c_adap->dev, "read %d byte%s\n",
+ ret, ret == 1 ? "" : "s");
+ if (ret < pmsg->len) {
+ if (ret >= 0)
+ ret = -EREMOTEIO;
+ goto bailout;
}
} else {
/* write bytes from buffer */
ret = sendbytes(i2c_adap, pmsg);
- DEB2(printk(KERN_DEBUG "i2c-algo-bit.o: wrote %d bytes.\n",ret));
- if (ret < pmsg->len ) {
- return (ret<0) ? ret : -EREMOTEIO;
+ if (ret >= 1)
+ bit_dbg(2, &i2c_adap->dev, "wrote %d byte%s\n",
+ ret, ret == 1 ? "" : "s");
+ if (ret < pmsg->len) {
+ if (ret >= 0)
+ ret = -EREMOTEIO;
+ goto bailout;
}
}
}
+ ret = i;
+
+bailout:
+ bit_dbg(3, &i2c_adap->dev, "emitting stop condition\n");
i2c_stop(adap);
- return num;
+ return ret;
}
static u32 bit_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
+ I2C_FUNC_SMBUS_READ_BLOCK_DATA |
+ I2C_FUNC_SMBUS_BLOCK_PROC_CALL |
I2C_FUNC_10BIT_ADDR | I2C_FUNC_PROTOCOL_MANGLING;
}
/*
* registering functions to load algorithms at runtime
*/
-int i2c_bit_add_bus(struct i2c_adapter *adap)
+static int i2c_bit_prepare_bus(struct i2c_adapter *adap)
{
struct i2c_algo_bit_data *bit_adap = adap->algo_data;
return -ENODEV;
}
- DEB2(dev_dbg(&adap->dev, "hw routines registered.\n"));
-
/* register new adapter to i2c module... */
adap->algo = &i2c_bit_algo;
adap->timeout = 100; /* default values, should */
adap->retries = 3; /* be replaced by defines */
+ return 0;
+}
+
+int i2c_bit_add_bus(struct i2c_adapter *adap)
+{
+ int err;
+
+ err = i2c_bit_prepare_bus(adap);
+ if (err)
+ return err;
+
return i2c_add_adapter(adap);
}
EXPORT_SYMBOL(i2c_bit_add_bus);
+int i2c_bit_add_numbered_bus(struct i2c_adapter *adap)
+{
+ int err;
+
+ err = i2c_bit_prepare_bus(adap);
+ if (err)
+ return err;
+
+ return i2c_add_numbered_adapter(adap);
+}
+EXPORT_SYMBOL(i2c_bit_add_numbered_bus);
+
MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>");
MODULE_DESCRIPTION("I2C-Bus bit-banging algorithm");
MODULE_LICENSE("GPL");
-
-module_param(bit_test, bool, 0);
-module_param(i2c_debug, int, S_IRUGO | S_IWUSR);
-
-MODULE_PARM_DESC(bit_test, "Test the lines of the bus to see if it is stuck");
-MODULE_PARM_DESC(i2c_debug,
- "debug level - 0 off; 1 normal; 2,3 more verbose; 9 bit-protocol");
/*
- * i2c-algo-sgi.c: i2c driver algorithms for SGI adapters.
- *
+ * i2c-algo-sgi.c: i2c driver algorithm used by the VINO (SGI Indy) and
+ * MACE (SGI O2) chips.
+ *
* This file is subject to the terms and conditions of the GNU General Public
* License version 2 as published by the Free Software Foundation.
*
.functionality = sgi_func,
};
-/*
- * registering functions to load algorithms at runtime
+/*
+ * registering functions to load algorithms at runtime
*/
int i2c_sgi_add_bus(struct i2c_adapter *adap)
{
#
menu "I2C Hardware Bus support"
- depends on I2C
config I2C_ALI1535
tristate "ALI 1535"
- depends on I2C && PCI
+ depends on PCI
help
If you say yes to this option, support will be included for the SMB
Host controller on Acer Labs Inc. (ALI) M1535 South Bridges. The SMB
config I2C_ALI1563
tristate "ALI 1563"
- depends on I2C && PCI && EXPERIMENTAL
+ depends on PCI && EXPERIMENTAL
help
If you say yes to this option, support will be included for the SMB
Host controller on Acer Labs Inc. (ALI) M1563 South Bridges. The SMB
config I2C_ALI15X3
tristate "ALI 15x3"
- depends on I2C && PCI
+ depends on PCI
help
If you say yes to this option, support will be included for the
Acer Labs Inc. (ALI) M1514 and M1543 motherboard I2C interfaces.
config I2C_AMD756
tristate "AMD 756/766/768/8111 and nVidia nForce"
- depends on I2C && PCI
+ depends on PCI
help
If you say yes to this option, support will be included for the AMD
756/766/768 mainboard I2C interfaces. The driver also includes
config I2C_AMD8111
tristate "AMD 8111"
- depends on I2C && PCI
+ depends on PCI
help
If you say yes to this option, support will be included for the
second (SMBus 2.0) AMD 8111 mainboard I2C interface.
config I2C_AT91
tristate "Atmel AT91 I2C Two-Wire interface (TWI)"
- depends on I2C && ARCH_AT91 && EXPERIMENTAL
+ depends on ARCH_AT91 && EXPERIMENTAL
help
This supports the use of the I2C interface on Atmel AT91
processors.
config I2C_AU1550
tristate "Au1550/Au1200 SMBus interface"
- depends on I2C && (SOC_AU1550 || SOC_AU1200)
+ depends on SOC_AU1550 || SOC_AU1200
help
If you say yes to this option, support will be included for the
Au1550 and Au1200 SMBus interface.
This driver can also be built as a module. If so, the module
will be called i2c-au1550.
+config I2C_BLACKFIN_TWI
+ tristate "Blackfin TWI I2C support"
+ depends on BF534 || BF536 || BF537
+ help
+ This is the TWI I2C device driver for Blackfin 534/536/537.
+ This driver can also be built as a module. If so, the module
+ will be called i2c-bfin-twi.
+
+config I2C_BLACKFIN_TWI_CLK_KHZ
+ int "Blackfin TWI I2C clock (kHz)"
+ depends on I2C_BLACKFIN_TWI
+ range 10 400
+ default 50
+ help
+ The unit of the TWI clock is kHz.
+
config I2C_ELEKTOR
tristate "Elektor ISA card"
- depends on I2C && ISA && BROKEN_ON_SMP
+ depends on ISA && BROKEN_ON_SMP
select I2C_ALGOPCF
help
This supports the PCF8584 ISA bus I2C adapter. Say Y if you own
This support is also available as a module. If so, the module
will be called i2c-elektor.
+config I2C_GPIO
+ tristate "GPIO-based bitbanging I2C"
+ depends on GENERIC_GPIO
+ select I2C_ALGOBIT
+ help
+ This is a very simple bitbanging I2C driver utilizing the
+ arch-neutral GPIO API to control the SCL and SDA lines.
+
config I2C_HYDRA
tristate "CHRP Apple Hydra Mac I/O I2C interface"
- depends on I2C && PCI && PPC_CHRP && EXPERIMENTAL
+ depends on PCI && PPC_CHRP && EXPERIMENTAL
select I2C_ALGOBIT
help
This supports the use of the I2C interface in the Apple Hydra Mac
config I2C_I801
tristate "Intel 82801 (ICH)"
- depends on I2C && PCI
+ depends on PCI
help
If you say yes to this option, support will be included for the Intel
801 family of mainboard I2C interfaces. Specifically, the following
config I2C_I810
tristate "Intel 810/815"
- depends on I2C && PCI
+ depends on PCI
select I2C_ALGOBIT
help
If you say yes to this option, support will be included for the Intel
config I2C_PXA
tristate "Intel PXA2XX I2C adapter (EXPERIMENTAL)"
- depends on I2C && EXPERIMENTAL && ARCH_PXA
+ depends on EXPERIMENTAL && ARCH_PXA
help
If you have devices in the PXA I2C bus, say yes to this option.
This driver can also be built as a module. If so, the module
config I2C_PIIX4
tristate "Intel PIIX4 and compatible (ATI/Serverworks/Broadcom/SMSC)"
- depends on I2C && PCI
+ depends on PCI
help
If you say yes to this option, support will be included for the Intel
PIIX4 family of mainboard I2C interfaces. Specifically, the following
config I2C_IBM_IIC
tristate "IBM PPC 4xx on-chip I2C interface"
- depends on IBM_OCP && I2C
+ depends on IBM_OCP
help
Say Y here if you want to use IIC peripheral found on
embedded IBM PPC 4xx based systems.
config I2C_IOP3XX
tristate "Intel IOPx3xx and IXP4xx on-chip I2C interface"
- depends on (ARCH_IOP32X || ARCH_IOP33X || ARCH_IXP4XX || ARCH_IOP13XX) && I2C
+ depends on ARCH_IOP32X || ARCH_IOP33X || ARCH_IXP4XX || ARCH_IOP13XX
help
Say Y here if you want to use the IIC bus controller on
the Intel IOPx3xx I/O Processors or IXP4xx Network Processors.
config I2C_ISA
tristate
- depends on I2C
config I2C_IXP4XX
- tristate "IXP4xx GPIO-Based I2C Interface"
- depends on I2C && ARCH_IXP4XX
+ tristate "IXP4xx GPIO-Based I2C Interface (DEPRECATED)"
+ depends on ARCH_IXP4XX
select I2C_ALGOBIT
help
Say Y here if you have an Intel IXP4xx(420,421,422,425) based
This support is also available as a module. If so, the module
will be called i2c-ixp4xx.
+ This driver is deprecated and will be dropped soon. Use i2c-gpio
+ instead.
+
config I2C_IXP2000
- tristate "IXP2000 GPIO-Based I2C Interface"
- depends on I2C && ARCH_IXP2000
+ tristate "IXP2000 GPIO-Based I2C Interface (DEPRECATED)"
+ depends on ARCH_IXP2000
select I2C_ALGOBIT
help
Say Y here if you have an Intel IXP2000(2400, 2800, 2850) based
This support is also available as a module. If so, the module
will be called i2c-ixp2000.
+ This driver is deprecated and will be dropped soon. Use i2c-gpio
+ instead.
+
config I2C_POWERMAC
tristate "Powermac I2C interface"
- depends on I2C && PPC_PMAC
+ depends on PPC_PMAC
default y
help
This exposes the various PowerMac i2c interfaces to the linux i2c
config I2C_MPC
tristate "MPC107/824x/85xx/52xx/86xx"
- depends on I2C && PPC32
+ depends on PPC32
help
If you say yes to this option, support will be included for the
built-in I2C interface on the MPC107/Tsi107/MPC8240/MPC8245 and
config I2C_NFORCE2
tristate "Nvidia nForce2, nForce3 and nForce4"
- depends on I2C && PCI
+ depends on PCI
help
If you say yes to this option, support will be included for the Nvidia
nForce2, nForce3 and nForce4 families of mainboard I2C interfaces.
config I2C_OCORES
tristate "OpenCores I2C Controller"
- depends on I2C && EXPERIMENTAL
+ depends on EXPERIMENTAL
help
If you say yes to this option, support will be included for the
OpenCores I2C controller. For details see
config I2C_OMAP
tristate "OMAP I2C adapter"
- depends on I2C && ARCH_OMAP
+ depends on ARCH_OMAP
default y if MACH_OMAP_H3 || MACH_OMAP_OSK
help
If you say yes to this option, support will be included for the
config I2C_PARPORT
tristate "Parallel port adapter"
- depends on I2C && PARPORT
+ depends on PARPORT
select I2C_ALGOBIT
help
This supports parallel port I2C adapters such as the ones made by
config I2C_PARPORT_LIGHT
tristate "Parallel port adapter (light)"
- depends on I2C
select I2C_ALGOBIT
help
This supports parallel port I2C adapters such as the ones made by
config I2C_PASEMI
tristate "PA Semi SMBus interface"
- depends on PPC_PASEMI && I2C && PCI
+ depends on PPC_PASEMI && PCI
help
Supports the PA Semi PWRficient on-chip SMBus interfaces.
config I2C_PROSAVAGE
tristate "S3/VIA (Pro)Savage"
- depends on I2C && PCI
+ depends on PCI
select I2C_ALGOBIT
help
If you say yes to this option, support will be included for the
config I2C_RPXLITE
tristate "Embedded Planet RPX Lite/Classic support"
- depends on (RPXLITE || RPXCLASSIC) && I2C
+ depends on RPXLITE || RPXCLASSIC
select I2C_ALGO8XX
config I2C_S3C2410
tristate "S3C2410 I2C Driver"
- depends on I2C && ARCH_S3C2410
+ depends on ARCH_S3C2410
help
Say Y here to include support for I2C controller in the
Samsung S3C2410 based System-on-Chip devices.
config I2C_SAVAGE4
tristate "S3 Savage 4"
- depends on I2C && PCI && EXPERIMENTAL
+ depends on PCI && EXPERIMENTAL
select I2C_ALGOBIT
help
If you say yes to this option, support will be included for the
config I2C_SIBYTE
tristate "SiByte SMBus interface"
- depends on SIBYTE_SB1xxx_SOC && I2C
+ depends on SIBYTE_SB1xxx_SOC
help
Supports the SiByte SOC on-chip I2C interfaces (2 channels).
+config I2C_SIMTEC
+ tristate "Simtec Generic I2C interface"
+ select I2C_ALGOBIT
+ help
+ If you say yes to this option, support will be inclyded for
+ the Simtec Generic I2C interface. This driver is for the
+ simple I2C bus used on newer Simtec products for general
+ I2C, such as DDC on the Simtec BBD2016A.
+
+ This driver can also be build as a module. If so, the module
+ will be called i2c-simtec.
+
config SCx200_I2C
- tristate "NatSemi SCx200 I2C using GPIO pins"
- depends on SCx200_GPIO && I2C
+ tristate "NatSemi SCx200 I2C using GPIO pins (DEPRECATED)"
+ depends on SCx200_GPIO
select I2C_ALGOBIT
help
Enable the use of two GPIO pins of a SCx200 processor as an I2C bus.
This support is also available as a module. If so, the module
will be called scx200_i2c.
+ This driver is deprecated and will be dropped soon. Use i2c-gpio
+ (or scx200_acb) instead.
+
config SCx200_I2C_SCL
int "GPIO pin used for SCL"
depends on SCx200_I2C
config SCx200_ACB
tristate "Geode ACCESS.bus support"
- depends on X86_32 && I2C && PCI
+ depends on X86_32 && PCI
help
Enable the use of the ACCESS.bus controllers on the Geode SCx200 and
SC1100 processors and the CS5535 and CS5536 Geode companion devices.
config I2C_SIS5595
tristate "SiS 5595"
- depends on I2C && PCI
+ depends on PCI
help
If you say yes to this option, support will be included for the
SiS5595 SMBus (a subset of I2C) interface.
config I2C_SIS630
tristate "SiS 630/730"
- depends on I2C && PCI
+ depends on PCI
help
If you say yes to this option, support will be included for the
SiS630 and SiS730 SMBus (a subset of I2C) interface.
config I2C_SIS96X
tristate "SiS 96x"
- depends on I2C && PCI
+ depends on PCI
help
If you say yes to this option, support will be included for the SiS
96x SMBus (a subset of I2C) interfaces. Specifically, the following
config I2C_STUB
tristate "I2C/SMBus Test Stub"
- depends on I2C && EXPERIMENTAL && 'm'
+ depends on EXPERIMENTAL && m
default 'n'
help
This module may be useful to developers of SMBus client drivers,
If you don't know what to do here, definitely say N.
+config I2C_TINY_USB
+ tristate "I2C-Tiny-USB"
+ depends on USB
+ help
+ If you say yes to this option, support will be included for the
+ i2c-tiny-usb, a simple do-it-yourself USB to I2C interface. See
+ http://www.harbaum.org/till/i2c_tiny_usb for hardware details.
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-tiny-usb.
+
config I2C_VERSATILE
tristate "ARM Versatile/Realview I2C bus support"
- depends on I2C && (ARCH_VERSATILE || ARCH_REALVIEW)
+ depends on ARCH_VERSATILE || ARCH_REALVIEW
select I2C_ALGOBIT
help
Say yes if you want to support the I2C serial bus on ARMs Versatile
config I2C_ACORN
bool "Acorn IOC/IOMD I2C bus support"
- depends on I2C && ARCH_ACORN
+ depends on ARCH_ACORN
default y
select I2C_ALGOBIT
help
config I2C_VIA
tristate "VIA 82C586B"
- depends on I2C && PCI && EXPERIMENTAL
+ depends on PCI && EXPERIMENTAL
select I2C_ALGOBIT
help
If you say yes to this option, support will be included for the VIA
config I2C_VIAPRO
tristate "VIA VT82C596/82C686/82xx and CX700"
- depends on I2C && PCI
+ depends on PCI
help
If you say yes to this option, support will be included for the VIA
VT82C596 and later SMBus interface. Specifically, the following
config I2C_VOODOO3
tristate "Voodoo 3"
- depends on I2C && PCI
+ depends on PCI
select I2C_ALGOBIT
help
If you say yes to this option, support will be included for the
config I2C_PCA_ISA
tristate "PCA9564 on an ISA bus"
- depends on I2C
+ depends on ISA
select I2C_ALGOPCA
default n
help
config I2C_MV64XXX
tristate "Marvell mv64xxx I2C Controller"
- depends on I2C && MV64X60 && EXPERIMENTAL
+ depends on MV64X60 && EXPERIMENTAL
help
If you say yes to this option, support will be included for the
built-in I2C interface on the Marvell 64xxx line of host bridges.
config I2C_PNX
tristate "I2C bus support for Philips PNX targets"
- depends on ARCH_PNX4008 && I2C
+ depends on ARCH_PNX4008
help
This driver supports the Philips IP3204 I2C IP block master and/or
slave controller
obj-$(CONFIG_I2C_AMD8111) += i2c-amd8111.o
obj-$(CONFIG_I2C_AT91) += i2c-at91.o
obj-$(CONFIG_I2C_AU1550) += i2c-au1550.o
+obj-$(CONFIG_I2C_BLACKFIN_TWI) += i2c-bfin-twi.o
obj-$(CONFIG_I2C_ELEKTOR) += i2c-elektor.o
+obj-$(CONFIG_I2C_GPIO) += i2c-gpio.o
obj-$(CONFIG_I2C_HYDRA) += i2c-hydra.o
obj-$(CONFIG_I2C_I801) += i2c-i801.o
obj-$(CONFIG_I2C_I810) += i2c-i810.o
obj-$(CONFIG_I2C_S3C2410) += i2c-s3c2410.o
obj-$(CONFIG_I2C_SAVAGE4) += i2c-savage4.o
obj-$(CONFIG_I2C_SIBYTE) += i2c-sibyte.o
+obj-$(CONFIG_I2C_SIMTEC) += i2c-simtec.o
obj-$(CONFIG_I2C_SIS5595) += i2c-sis5595.o
obj-$(CONFIG_I2C_SIS630) += i2c-sis630.o
obj-$(CONFIG_I2C_SIS96X) += i2c-sis96x.o
obj-$(CONFIG_I2C_STUB) += i2c-stub.o
+obj-$(CONFIG_I2C_TINY_USB) += i2c-tiny-usb.o
obj-$(CONFIG_I2C_VERSATILE) += i2c-versatile.o
obj-$(CONFIG_I2C_ACORN) += i2c-acorn.o
obj-$(CONFIG_I2C_VIA) += i2c-via.o
/* set up the sysfs linkage to our parent device */
ali1535_adapter.dev.parent = &dev->dev;
- snprintf(ali1535_adapter.name, I2C_NAME_SIZE,
+ snprintf(ali1535_adapter.name, sizeof(ali1535_adapter.name),
"SMBus ALI1535 adapter at %04x", ali1535_smba);
return i2c_add_adapter(&ali1535_adapter);
}
/* set up the sysfs linkage to our parent device */
ali15x3_adapter.dev.parent = &dev->dev;
- snprintf(ali15x3_adapter.name, I2C_NAME_SIZE,
+ snprintf(ali15x3_adapter.name, sizeof(ali15x3_adapter.name),
"SMBus ALI15X3 adapter at %04x", ali15x3_smba);
return i2c_add_adapter(&ali15x3_adapter);
}
}
smbus->adapter.owner = THIS_MODULE;
- snprintf(smbus->adapter.name, I2C_NAME_SIZE,
+ snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
"SMBus2 AMD8111 adapter at %04x", smbus->base);
smbus->adapter.id = I2C_HW_SMBUS_AMD8111;
smbus->adapter.class = I2C_CLASS_HWMON;
--- /dev/null
+/*
+ * drivers/i2c/busses/i2c-bfin-twi.c
+ *
+ * Description: Driver for Blackfin Two Wire Interface
+ *
+ * Author: sonicz <sonic.zhang@analog.com>
+ *
+ * Copyright (c) 2005-2007 Analog Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/mm.h>
+#include <linux/timer.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+
+#include <asm/blackfin.h>
+#include <asm/irq.h>
+
+#define POLL_TIMEOUT (2 * HZ)
+
+/* SMBus mode*/
+#define TWI_I2C_MODE_STANDARD 0x01
+#define TWI_I2C_MODE_STANDARDSUB 0x02
+#define TWI_I2C_MODE_COMBINED 0x04
+
+struct bfin_twi_iface {
+ struct mutex twi_lock;
+ int irq;
+ spinlock_t lock;
+ char read_write;
+ u8 command;
+ u8 *transPtr;
+ int readNum;
+ int writeNum;
+ int cur_mode;
+ int manual_stop;
+ int result;
+ int timeout_count;
+ struct timer_list timeout_timer;
+ struct i2c_adapter adap;
+ struct completion complete;
+};
+
+static struct bfin_twi_iface twi_iface;
+
+static void bfin_twi_handle_interrupt(struct bfin_twi_iface *iface)
+{
+ unsigned short twi_int_status = bfin_read_TWI_INT_STAT();
+ unsigned short mast_stat = bfin_read_TWI_MASTER_STAT();
+
+ if (twi_int_status & XMTSERV) {
+ /* Transmit next data */
+ if (iface->writeNum > 0) {
+ bfin_write_TWI_XMT_DATA8(*(iface->transPtr++));
+ iface->writeNum--;
+ }
+ /* start receive immediately after complete sending in
+ * combine mode.
+ */
+ else if (iface->cur_mode == TWI_I2C_MODE_COMBINED) {
+ bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL()
+ | MDIR | RSTART);
+ } else if (iface->manual_stop)
+ bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL()
+ | STOP);
+ SSYNC();
+ /* Clear status */
+ bfin_write_TWI_INT_STAT(XMTSERV);
+ SSYNC();
+ }
+ if (twi_int_status & RCVSERV) {
+ if (iface->readNum > 0) {
+ /* Receive next data */
+ *(iface->transPtr) = bfin_read_TWI_RCV_DATA8();
+ if (iface->cur_mode == TWI_I2C_MODE_COMBINED) {
+ /* Change combine mode into sub mode after
+ * read first data.
+ */
+ iface->cur_mode = TWI_I2C_MODE_STANDARDSUB;
+ /* Get read number from first byte in block
+ * combine mode.
+ */
+ if (iface->readNum == 1 && iface->manual_stop)
+ iface->readNum = *iface->transPtr + 1;
+ }
+ iface->transPtr++;
+ iface->readNum--;
+ } else if (iface->manual_stop) {
+ bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL()
+ | STOP);
+ SSYNC();
+ }
+ /* Clear interrupt source */
+ bfin_write_TWI_INT_STAT(RCVSERV);
+ SSYNC();
+ }
+ if (twi_int_status & MERR) {
+ bfin_write_TWI_INT_STAT(MERR);
+ bfin_write_TWI_INT_MASK(0);
+ bfin_write_TWI_MASTER_STAT(0x3e);
+ bfin_write_TWI_MASTER_CTL(0);
+ SSYNC();
+ iface->result = -1;
+ /* if both err and complete int stats are set, return proper
+ * results.
+ */
+ if (twi_int_status & MCOMP) {
+ bfin_write_TWI_INT_STAT(MCOMP);
+ bfin_write_TWI_INT_MASK(0);
+ bfin_write_TWI_MASTER_CTL(0);
+ SSYNC();
+ /* If it is a quick transfer, only address bug no data,
+ * not an err, return 1.
+ */
+ if (iface->writeNum == 0 && (mast_stat & BUFRDERR))
+ iface->result = 1;
+ /* If address not acknowledged return -1,
+ * else return 0.
+ */
+ else if (!(mast_stat & ANAK))
+ iface->result = 0;
+ }
+ complete(&iface->complete);
+ return;
+ }
+ if (twi_int_status & MCOMP) {
+ bfin_write_TWI_INT_STAT(MCOMP);
+ SSYNC();
+ if (iface->cur_mode == TWI_I2C_MODE_COMBINED) {
+ if (iface->readNum == 0) {
+ /* set the read number to 1 and ask for manual
+ * stop in block combine mode
+ */
+ iface->readNum = 1;
+ iface->manual_stop = 1;
+ bfin_write_TWI_MASTER_CTL(
+ bfin_read_TWI_MASTER_CTL()
+ | (0xff << 6));
+ } else {
+ /* set the readd number in other
+ * combine mode.
+ */
+ bfin_write_TWI_MASTER_CTL(
+ (bfin_read_TWI_MASTER_CTL() &
+ (~(0xff << 6))) |
+ ( iface->readNum << 6));
+ }
+ /* remove restart bit and enable master receive */
+ bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() &
+ ~RSTART);
+ bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() |
+ MEN | MDIR);
+ SSYNC();
+ } else {
+ iface->result = 1;
+ bfin_write_TWI_INT_MASK(0);
+ bfin_write_TWI_MASTER_CTL(0);
+ SSYNC();
+ complete(&iface->complete);
+ }
+ }
+}
+
+/* Interrupt handler */
+static irqreturn_t bfin_twi_interrupt_entry(int irq, void *dev_id)
+{
+ struct bfin_twi_iface *iface = dev_id;
+ unsigned long flags;
+
+ spin_lock_irqsave(&iface->lock, flags);
+ del_timer(&iface->timeout_timer);
+ bfin_twi_handle_interrupt(iface);
+ spin_unlock_irqrestore(&iface->lock, flags);
+ return IRQ_HANDLED;
+}
+
+static void bfin_twi_timeout(unsigned long data)
+{
+ struct bfin_twi_iface *iface = (struct bfin_twi_iface *)data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&iface->lock, flags);
+ bfin_twi_handle_interrupt(iface);
+ if (iface->result == 0) {
+ iface->timeout_count--;
+ if (iface->timeout_count > 0) {
+ iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
+ add_timer(&iface->timeout_timer);
+ } else {
+ iface->result = -1;
+ complete(&iface->complete);
+ }
+ }
+ spin_unlock_irqrestore(&iface->lock, flags);
+}
+
+/*
+ * Generic i2c master transfer entrypoint
+ */
+static int bfin_twi_master_xfer(struct i2c_adapter *adap,
+ struct i2c_msg *msgs, int num)
+{
+ struct bfin_twi_iface *iface = adap->algo_data;
+ struct i2c_msg *pmsg;
+ int i, ret;
+ int rc = 0;
+
+ if (!(bfin_read_TWI_CONTROL() & TWI_ENA))
+ return -ENXIO;
+
+ mutex_lock(&iface->twi_lock);
+
+ while (bfin_read_TWI_MASTER_STAT() & BUSBUSY) {
+ mutex_unlock(&iface->twi_lock);
+ yield();
+ mutex_lock(&iface->twi_lock);
+ }
+
+ ret = 0;
+ for (i = 0; rc >= 0 && i < num; i++) {
+ pmsg = &msgs[i];
+ if (pmsg->flags & I2C_M_TEN) {
+ dev_err(&(adap->dev), "i2c-bfin-twi: 10 bits addr "
+ "not supported !\n");
+ rc = -EINVAL;
+ break;
+ }
+
+ iface->cur_mode = TWI_I2C_MODE_STANDARD;
+ iface->manual_stop = 0;
+ iface->transPtr = pmsg->buf;
+ iface->writeNum = iface->readNum = pmsg->len;
+ iface->result = 0;
+ iface->timeout_count = 10;
+ /* Set Transmit device address */
+ bfin_write_TWI_MASTER_ADDR(pmsg->addr);
+
+ /* FIFO Initiation. Data in FIFO should be
+ * discarded before start a new operation.
+ */
+ bfin_write_TWI_FIFO_CTL(0x3);
+ SSYNC();
+ bfin_write_TWI_FIFO_CTL(0);
+ SSYNC();
+
+ if (pmsg->flags & I2C_M_RD)
+ iface->read_write = I2C_SMBUS_READ;
+ else {
+ iface->read_write = I2C_SMBUS_WRITE;
+ /* Transmit first data */
+ if (iface->writeNum > 0) {
+ bfin_write_TWI_XMT_DATA8(*(iface->transPtr++));
+ iface->writeNum--;
+ SSYNC();
+ }
+ }
+
+ /* clear int stat */
+ bfin_write_TWI_INT_STAT(MERR|MCOMP|XMTSERV|RCVSERV);
+
+ /* Interrupt mask . Enable XMT, RCV interrupt */
+ bfin_write_TWI_INT_MASK(MCOMP | MERR |
+ ((iface->read_write == I2C_SMBUS_READ)?
+ RCVSERV : XMTSERV));
+ SSYNC();
+
+ if (pmsg->len > 0 && pmsg->len <= 255)
+ bfin_write_TWI_MASTER_CTL(pmsg->len << 6);
+ else if (pmsg->len > 255) {
+ bfin_write_TWI_MASTER_CTL(0xff << 6);
+ iface->manual_stop = 1;
+ } else
+ break;
+
+ iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
+ add_timer(&iface->timeout_timer);
+
+ /* Master enable */
+ bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() | MEN |
+ ((iface->read_write == I2C_SMBUS_READ) ? MDIR : 0) |
+ ((CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ>100) ? FAST : 0));
+ SSYNC();
+
+ wait_for_completion(&iface->complete);
+
+ rc = iface->result;
+ if (rc == 1)
+ ret++;
+ else if (rc == -1)
+ break;
+ }
+
+ /* Release mutex */
+ mutex_unlock(&iface->twi_lock);
+
+ return ret;
+}
+
+/*
+ * SMBus type transfer entrypoint
+ */
+
+int bfin_twi_smbus_xfer(struct i2c_adapter *adap, u16 addr,
+ unsigned short flags, char read_write,
+ u8 command, int size, union i2c_smbus_data *data)
+{
+ struct bfin_twi_iface *iface = adap->algo_data;
+ int rc = 0;
+
+ if (!(bfin_read_TWI_CONTROL() & TWI_ENA))
+ return -ENXIO;
+
+ mutex_lock(&iface->twi_lock);
+
+ while (bfin_read_TWI_MASTER_STAT() & BUSBUSY) {
+ mutex_unlock(&iface->twi_lock);
+ yield();
+ mutex_lock(&iface->twi_lock);
+ }
+
+ iface->writeNum = 0;
+ iface->readNum = 0;
+
+ /* Prepare datas & select mode */
+ switch (size) {
+ case I2C_SMBUS_QUICK:
+ iface->transPtr = NULL;
+ iface->cur_mode = TWI_I2C_MODE_STANDARD;
+ break;
+ case I2C_SMBUS_BYTE:
+ if (data == NULL)
+ iface->transPtr = NULL;
+ else {
+ if (read_write == I2C_SMBUS_READ)
+ iface->readNum = 1;
+ else
+ iface->writeNum = 1;
+ iface->transPtr = &data->byte;
+ }
+ iface->cur_mode = TWI_I2C_MODE_STANDARD;
+ break;
+ case I2C_SMBUS_BYTE_DATA:
+ if (read_write == I2C_SMBUS_READ) {
+ iface->readNum = 1;
+ iface->cur_mode = TWI_I2C_MODE_COMBINED;
+ } else {
+ iface->writeNum = 1;
+ iface->cur_mode = TWI_I2C_MODE_STANDARDSUB;
+ }
+ iface->transPtr = &data->byte;
+ break;
+ case I2C_SMBUS_WORD_DATA:
+ if (read_write == I2C_SMBUS_READ) {
+ iface->readNum = 2;
+ iface->cur_mode = TWI_I2C_MODE_COMBINED;
+ } else {
+ iface->writeNum = 2;
+ iface->cur_mode = TWI_I2C_MODE_STANDARDSUB;
+ }
+ iface->transPtr = (u8 *)&data->word;
+ break;
+ case I2C_SMBUS_PROC_CALL:
+ iface->writeNum = 2;
+ iface->readNum = 2;
+ iface->cur_mode = TWI_I2C_MODE_COMBINED;
+ iface->transPtr = (u8 *)&data->word;
+ break;
+ case I2C_SMBUS_BLOCK_DATA:
+ if (read_write == I2C_SMBUS_READ) {
+ iface->readNum = 0;
+ iface->cur_mode = TWI_I2C_MODE_COMBINED;
+ } else {
+ iface->writeNum = data->block[0] + 1;
+ iface->cur_mode = TWI_I2C_MODE_STANDARDSUB;
+ }
+ iface->transPtr = data->block;
+ break;
+ default:
+ return -1;
+ }
+
+ iface->result = 0;
+ iface->manual_stop = 0;
+ iface->read_write = read_write;
+ iface->command = command;
+ iface->timeout_count = 10;
+
+ /* FIFO Initiation. Data in FIFO should be discarded before
+ * start a new operation.
+ */
+ bfin_write_TWI_FIFO_CTL(0x3);
+ SSYNC();
+ bfin_write_TWI_FIFO_CTL(0);
+
+ /* clear int stat */
+ bfin_write_TWI_INT_STAT(MERR|MCOMP|XMTSERV|RCVSERV);
+
+ /* Set Transmit device address */
+ bfin_write_TWI_MASTER_ADDR(addr);
+ SSYNC();
+
+ iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
+ add_timer(&iface->timeout_timer);
+
+ switch (iface->cur_mode) {
+ case TWI_I2C_MODE_STANDARDSUB:
+ bfin_write_TWI_XMT_DATA8(iface->command);
+ bfin_write_TWI_INT_MASK(MCOMP | MERR |
+ ((iface->read_write == I2C_SMBUS_READ) ?
+ RCVSERV : XMTSERV));
+ SSYNC();
+
+ if (iface->writeNum + 1 <= 255)
+ bfin_write_TWI_MASTER_CTL((iface->writeNum + 1) << 6);
+ else {
+ bfin_write_TWI_MASTER_CTL(0xff << 6);
+ iface->manual_stop = 1;
+ }
+ /* Master enable */
+ bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() | MEN |
+ ((CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ>100) ? FAST : 0));
+ break;
+ case TWI_I2C_MODE_COMBINED:
+ bfin_write_TWI_XMT_DATA8(iface->command);
+ bfin_write_TWI_INT_MASK(MCOMP | MERR | RCVSERV | XMTSERV);
+ SSYNC();
+
+ if (iface->writeNum > 0)
+ bfin_write_TWI_MASTER_CTL((iface->writeNum + 1) << 6);
+ else
+ bfin_write_TWI_MASTER_CTL(0x1 << 6);
+ /* Master enable */
+ bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() | MEN |
+ ((CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ>100) ? FAST : 0));
+ break;
+ default:
+ bfin_write_TWI_MASTER_CTL(0);
+ if (size != I2C_SMBUS_QUICK) {
+ /* Don't access xmit data register when this is a
+ * read operation.
+ */
+ if (iface->read_write != I2C_SMBUS_READ) {
+ if (iface->writeNum > 0) {
+ bfin_write_TWI_XMT_DATA8(*(iface->transPtr++));
+ if (iface->writeNum <= 255)
+ bfin_write_TWI_MASTER_CTL(iface->writeNum << 6);
+ else {
+ bfin_write_TWI_MASTER_CTL(0xff << 6);
+ iface->manual_stop = 1;
+ }
+ iface->writeNum--;
+ } else {
+ bfin_write_TWI_XMT_DATA8(iface->command);
+ bfin_write_TWI_MASTER_CTL(1 << 6);
+ }
+ } else {
+ if (iface->readNum > 0 && iface->readNum <= 255)
+ bfin_write_TWI_MASTER_CTL(iface->readNum << 6);
+ else if (iface->readNum > 255) {
+ bfin_write_TWI_MASTER_CTL(0xff << 6);
+ iface->manual_stop = 1;
+ } else {
+ del_timer(&iface->timeout_timer);
+ break;
+ }
+ }
+ }
+ bfin_write_TWI_INT_MASK(MCOMP | MERR |
+ ((iface->read_write == I2C_SMBUS_READ) ?
+ RCVSERV : XMTSERV));
+ SSYNC();
+
+ /* Master enable */
+ bfin_write_TWI_MASTER_CTL(bfin_read_TWI_MASTER_CTL() | MEN |
+ ((iface->read_write == I2C_SMBUS_READ) ? MDIR : 0) |
+ ((CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ > 100) ? FAST : 0));
+ break;
+ }
+ SSYNC();
+
+ wait_for_completion(&iface->complete);
+
+ rc = (iface->result >= 0) ? 0 : -1;
+
+ /* Release mutex */
+ mutex_unlock(&iface->twi_lock);
+
+ return rc;
+}
+
+/*
+ * Return what the adapter supports
+ */
+static u32 bfin_twi_functionality(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
+ I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
+ I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_PROC_CALL |
+ I2C_FUNC_I2C;
+}
+
+
+static struct i2c_algorithm bfin_twi_algorithm = {
+ .master_xfer = bfin_twi_master_xfer,
+ .smbus_xfer = bfin_twi_smbus_xfer,
+ .functionality = bfin_twi_functionality,
+};
+
+
+static int i2c_bfin_twi_suspend(struct platform_device *dev, pm_message_t state)
+{
+/* struct bfin_twi_iface *iface = platform_get_drvdata(dev);*/
+
+ /* Disable TWI */
+ bfin_write_TWI_CONTROL(bfin_read_TWI_CONTROL() & ~TWI_ENA);
+ SSYNC();
+
+ return 0;
+}
+
+static int i2c_bfin_twi_resume(struct platform_device *dev)
+{
+/* struct bfin_twi_iface *iface = platform_get_drvdata(dev);*/
+
+ /* Enable TWI */
+ bfin_write_TWI_CONTROL(bfin_read_TWI_CONTROL() | TWI_ENA);
+ SSYNC();
+
+ return 0;
+}
+
+static int i2c_bfin_twi_probe(struct platform_device *dev)
+{
+ struct bfin_twi_iface *iface = &twi_iface;
+ struct i2c_adapter *p_adap;
+ int rc;
+
+ mutex_init(&(iface->twi_lock));
+ spin_lock_init(&(iface->lock));
+ init_completion(&(iface->complete));
+ iface->irq = IRQ_TWI;
+
+ init_timer(&(iface->timeout_timer));
+ iface->timeout_timer.function = bfin_twi_timeout;
+ iface->timeout_timer.data = (unsigned long)iface;
+
+ p_adap = &iface->adap;
+ p_adap->id = I2C_HW_BLACKFIN;
+ strlcpy(p_adap->name, dev->name, sizeof(p_adap->name));
+ p_adap->algo = &bfin_twi_algorithm;
+ p_adap->algo_data = iface;
+ p_adap->class = I2C_CLASS_ALL;
+ p_adap->dev.parent = &dev->dev;
+
+ rc = request_irq(iface->irq, bfin_twi_interrupt_entry,
+ IRQF_DISABLED, dev->name, iface);
+ if (rc) {
+ dev_err(&(p_adap->dev), "i2c-bfin-twi: can't get IRQ %d !\n",
+ iface->irq);
+ return -ENODEV;
+ }
+
+ /* Set TWI internal clock as 10MHz */
+ bfin_write_TWI_CONTROL(((get_sclk() / 1024 / 1024 + 5) / 10) & 0x7F);
+
+ /* Set Twi interface clock as specified */
+ bfin_write_TWI_CLKDIV((( 5*1024 / CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ )
+ << 8) | (( 5*1024 / CONFIG_I2C_BLACKFIN_TWI_CLK_KHZ )
+ & 0xFF));
+
+ /* Enable TWI */
+ bfin_write_TWI_CONTROL(bfin_read_TWI_CONTROL() | TWI_ENA);
+ SSYNC();
+
+ rc = i2c_add_adapter(p_adap);
+ if (rc < 0)
+ free_irq(iface->irq, iface);
+ else
+ platform_set_drvdata(dev, iface);
+
+ return rc;
+}
+
+static int i2c_bfin_twi_remove(struct platform_device *pdev)
+{
+ struct bfin_twi_iface *iface = platform_get_drvdata(pdev);
+
+ platform_set_drvdata(pdev, NULL);
+
+ i2c_del_adapter(&(iface->adap));
+ free_irq(iface->irq, iface);
+
+ return 0;
+}
+
+static struct platform_driver i2c_bfin_twi_driver = {
+ .probe = i2c_bfin_twi_probe,
+ .remove = i2c_bfin_twi_remove,
+ .suspend = i2c_bfin_twi_suspend,
+ .resume = i2c_bfin_twi_resume,
+ .driver = {
+ .name = "i2c-bfin-twi",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init i2c_bfin_twi_init(void)
+{
+ pr_info("I2C: Blackfin I2C TWI driver\n");
+
+ return platform_driver_register(&i2c_bfin_twi_driver);
+}
+
+static void __exit i2c_bfin_twi_exit(void)
+{
+ platform_driver_unregister(&i2c_bfin_twi_driver);
+}
+
+MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
+MODULE_DESCRIPTION("I2C-Bus adapter routines for Blackfin TWI");
+MODULE_LICENSE("GPL");
+
+module_init(i2c_bfin_twi_init);
+module_exit(i2c_bfin_twi_exit);
#include <linux/pci.h>
#include <linux/wait.h>
+#include <linux/isa.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-pcf.h>
.name = "i2c-elektor",
};
-static int __init i2c_pcfisa_init(void)
+static int __devinit elektor_match(struct device *dev, unsigned int id)
{
#ifdef __alpha__
/* check to see we have memory mapped PCF8584 connected to the
/* yeap, we've found cypress, let's check config */
if (!pci_read_config_byte(cy693_dev, 0x47, &config)) {
- pr_debug("%s: found cy82c693, config "
- "register 0x47 = 0x%02x\n",
- pcf_isa_ops.name, config);
+ dev_dbg(dev, "found cy82c693, config "
+ "register 0x47 = 0x%02x\n", config);
/* UP2000 board has this register set to 0xe1,
but the most significant bit as seems can be
8.25 MHz (PCI/4) clock
(this can be read from cypress) */
clock = I2C_PCF_CLK | I2C_PCF_TRNS90;
- pr_info("%s: found API UP2000 like "
- "board, will probe PCF8584 "
- "later\n", pcf_isa_ops.name);
+ dev_info(dev, "found API UP2000 like "
+ "board, will probe PCF8584 "
+ "later\n");
}
}
pci_dev_put(cy693_dev);
/* sanity checks for mmapped I/O */
if (mmapped && base < 0xc8000) {
- printk(KERN_ERR "%s: incorrect base address (%#x) specified "
- "for mmapped I/O\n", pcf_isa_ops.name, base);
- return -ENODEV;
+ dev_err(dev, "incorrect base address (%#x) specified "
+ "for mmapped I/O\n", base);
+ return 0;
}
if (base == 0) {
base = DEFAULT_BASE;
}
+ return 1;
+}
+static int __devinit elektor_probe(struct device *dev, unsigned int id)
+{
init_waitqueue_head(&pcf_wait);
if (pcf_isa_init())
return -ENODEV;
+ pcf_isa_ops.dev.parent = dev;
if (i2c_pcf_add_bus(&pcf_isa_ops) < 0)
goto fail;
- dev_info(&pcf_isa_ops.dev, "found device at %#x\n", base);
+ dev_info(dev, "found device at %#x\n", base);
return 0;
return -ENODEV;
}
-static void i2c_pcfisa_exit(void)
+static int __devexit elektor_remove(struct device *dev, unsigned int id)
{
i2c_del_adapter(&pcf_isa_ops);
iounmap(base_iomem);
release_mem_region(base, 2);
}
+
+ return 0;
+}
+
+static struct isa_driver i2c_elektor_driver = {
+ .match = elektor_match,
+ .probe = elektor_probe,
+ .remove = __devexit_p(elektor_remove),
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "i2c-elektor",
+ },
+};
+
+static int __init i2c_pcfisa_init(void)
+{
+ return isa_register_driver(&i2c_elektor_driver, 1);
+}
+
+static void __exit i2c_pcfisa_exit(void)
+{
+ isa_unregister_driver(&i2c_elektor_driver);
}
MODULE_AUTHOR("Hans Berglund <hb@spacetec.no>");
--- /dev/null
+/*
+ * Bitbanging I2C bus driver using the GPIO API
+ *
+ * Copyright (C) 2007 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+#include <linux/i2c-gpio.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <asm/gpio.h>
+
+/* Toggle SDA by changing the direction of the pin */
+static void i2c_gpio_setsda_dir(void *data, int state)
+{
+ struct i2c_gpio_platform_data *pdata = data;
+
+ if (state)
+ gpio_direction_input(pdata->sda_pin);
+ else
+ gpio_direction_output(pdata->sda_pin, 0);
+}
+
+/*
+ * Toggle SDA by changing the output value of the pin. This is only
+ * valid for pins configured as open drain (i.e. setting the value
+ * high effectively turns off the output driver.)
+ */
+static void i2c_gpio_setsda_val(void *data, int state)
+{
+ struct i2c_gpio_platform_data *pdata = data;
+
+ gpio_set_value(pdata->sda_pin, state);
+}
+
+/* Toggle SCL by changing the direction of the pin. */
+static void i2c_gpio_setscl_dir(void *data, int state)
+{
+ struct i2c_gpio_platform_data *pdata = data;
+
+ if (state)
+ gpio_direction_input(pdata->scl_pin);
+ else
+ gpio_direction_output(pdata->scl_pin, 0);
+}
+
+/*
+ * Toggle SCL by changing the output value of the pin. This is used
+ * for pins that are configured as open drain and for output-only
+ * pins. The latter case will break the i2c protocol, but it will
+ * often work in practice.
+ */
+static void i2c_gpio_setscl_val(void *data, int state)
+{
+ struct i2c_gpio_platform_data *pdata = data;
+
+ gpio_set_value(pdata->scl_pin, state);
+}
+
+int i2c_gpio_getsda(void *data)
+{
+ struct i2c_gpio_platform_data *pdata = data;
+
+ return gpio_get_value(pdata->sda_pin);
+}
+
+int i2c_gpio_getscl(void *data)
+{
+ struct i2c_gpio_platform_data *pdata = data;
+
+ return gpio_get_value(pdata->scl_pin);
+}
+
+static int __init i2c_gpio_probe(struct platform_device *pdev)
+{
+ struct i2c_gpio_platform_data *pdata;
+ struct i2c_algo_bit_data *bit_data;
+ struct i2c_adapter *adap;
+ int ret;
+
+ pdata = pdev->dev.platform_data;
+ if (!pdata)
+ return -ENXIO;
+
+ ret = -ENOMEM;
+ adap = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL);
+ if (!adap)
+ goto err_alloc_adap;
+ bit_data = kzalloc(sizeof(struct i2c_algo_bit_data), GFP_KERNEL);
+ if (!bit_data)
+ goto err_alloc_bit_data;
+
+ ret = gpio_request(pdata->sda_pin, "sda");
+ if (ret)
+ goto err_request_sda;
+ ret = gpio_request(pdata->scl_pin, "scl");
+ if (ret)
+ goto err_request_scl;
+
+ if (pdata->sda_is_open_drain) {
+ gpio_direction_output(pdata->sda_pin, 1);
+ bit_data->setsda = i2c_gpio_setsda_val;
+ } else {
+ gpio_direction_input(pdata->sda_pin);
+ bit_data->setsda = i2c_gpio_setsda_dir;
+ }
+
+ if (pdata->scl_is_open_drain || pdata->scl_is_output_only) {
+ gpio_direction_output(pdata->scl_pin, 1);
+ bit_data->setscl = i2c_gpio_setscl_val;
+ } else {
+ gpio_direction_input(pdata->scl_pin);
+ bit_data->setscl = i2c_gpio_setscl_dir;
+ }
+
+ if (!pdata->scl_is_output_only)
+ bit_data->getscl = i2c_gpio_getscl;
+ bit_data->getsda = i2c_gpio_getsda;
+
+ if (pdata->udelay)
+ bit_data->udelay = pdata->udelay;
+ else if (pdata->scl_is_output_only)
+ bit_data->udelay = 50; /* 10 kHz */
+ else
+ bit_data->udelay = 5; /* 100 kHz */
+
+ if (pdata->timeout)
+ bit_data->timeout = pdata->timeout;
+ else
+ bit_data->timeout = HZ / 10; /* 100 ms */
+
+ bit_data->data = pdata;
+
+ adap->owner = THIS_MODULE;
+ snprintf(adap->name, sizeof(adap->name), "i2c-gpio%d", pdev->id);
+ adap->algo_data = bit_data;
+ adap->dev.parent = &pdev->dev;
+
+ ret = i2c_bit_add_bus(adap);
+ if (ret)
+ goto err_add_bus;
+
+ platform_set_drvdata(pdev, adap);
+
+ dev_info(&pdev->dev, "using pins %u (SDA) and %u (SCL%s)\n",
+ pdata->sda_pin, pdata->scl_pin,
+ pdata->scl_is_output_only
+ ? ", no clock stretching" : "");
+
+ return 0;
+
+err_add_bus:
+ gpio_free(pdata->scl_pin);
+err_request_scl:
+ gpio_free(pdata->sda_pin);
+err_request_sda:
+ kfree(bit_data);
+err_alloc_bit_data:
+ kfree(adap);
+err_alloc_adap:
+ return ret;
+}
+
+static int __exit i2c_gpio_remove(struct platform_device *pdev)
+{
+ struct i2c_gpio_platform_data *pdata;
+ struct i2c_adapter *adap;
+
+ adap = platform_get_drvdata(pdev);
+ pdata = pdev->dev.platform_data;
+
+ i2c_del_adapter(adap);
+ gpio_free(pdata->scl_pin);
+ gpio_free(pdata->sda_pin);
+ kfree(adap->algo_data);
+ kfree(adap);
+
+ return 0;
+}
+
+static struct platform_driver i2c_gpio_driver = {
+ .driver = {
+ .name = "i2c-gpio",
+ .owner = THIS_MODULE,
+ },
+ .remove = __exit_p(i2c_gpio_remove),
+};
+
+static int __init i2c_gpio_init(void)
+{
+ int ret;
+
+ ret = platform_driver_probe(&i2c_gpio_driver, i2c_gpio_probe);
+ if (ret)
+ printk(KERN_ERR "i2c-gpio: probe failed: %d\n", ret);
+
+ return ret;
+}
+module_init(i2c_gpio_init);
+
+static void __exit i2c_gpio_exit(void)
+{
+ platform_driver_unregister(&i2c_gpio_driver);
+}
+module_exit(i2c_gpio_exit);
+
+MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
+MODULE_DESCRIPTION("Platform-independent bitbanging I2C driver");
+MODULE_LICENSE("GPL");
/* set up the sysfs linkage to our parent device */
i801_adapter.dev.parent = &dev->dev;
- snprintf(i801_adapter.name, I2C_NAME_SIZE,
+ snprintf(i801_adapter.name, sizeof(i801_adapter.name),
"SMBus I801 adapter at %04lx", i801_smba);
err = i2c_add_adapter(&i801_adapter);
if (err) {
#include <linux/platform_device.h>
#include <linux/completion.h>
+/* Exported by i2c-core for i2c-isa only */
+extern void i2c_adapter_dev_release(struct device *dev);
+extern struct class i2c_adapter_class;
+
static u32 isa_func(struct i2c_adapter *adapter);
/* This is the actual algorithm we define */
}
-/* Copied from i2c-core */
-static ssize_t show_adapter_name(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct i2c_adapter *adap = dev_to_i2c_adapter(dev);
- return sprintf(buf, "%s\n", adap->name);
-}
-static DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL);
-
-
/* We implement an interface which resembles i2c_{add,del}_driver,
but for i2c-isa drivers. We don't have to remember and handle lists
of drivers and adapters so this is much more simple, of course. */
isa_adapter.nr = ANY_I2C_ISA_BUS;
isa_adapter.dev.parent = &platform_bus;
sprintf(isa_adapter.dev.bus_id, "i2c-%d", isa_adapter.nr);
- isa_adapter.dev.driver = &i2c_adapter_driver;
isa_adapter.dev.release = &i2c_adapter_dev_release;
+ isa_adapter.dev.class = &i2c_adapter_class;
err = device_register(&isa_adapter.dev);
if (err) {
printk(KERN_ERR "i2c-isa: Failed to register device\n");
goto exit;
}
- err = device_create_file(&isa_adapter.dev, &dev_attr_name);
- if (err) {
- printk(KERN_ERR "i2c-isa: Failed to create name file\n");
- goto exit_unregister;
- }
-
- /* Add this adapter to the i2c_adapter class */
- memset(&isa_adapter.class_dev, 0x00, sizeof(struct class_device));
- isa_adapter.class_dev.dev = &isa_adapter.dev;
- isa_adapter.class_dev.class = &i2c_adapter_class;
- strlcpy(isa_adapter.class_dev.class_id, isa_adapter.dev.bus_id,
- BUS_ID_SIZE);
- err = class_device_register(&isa_adapter.class_dev);
- if (err) {
- printk(KERN_ERR "i2c-isa: Failed to register class device\n");
- goto exit_remove_name;
- }
dev_dbg(&isa_adapter.dev, "%s registered\n", isa_adapter.name);
return 0;
-exit_remove_name:
- device_remove_file(&isa_adapter.dev, &dev_attr_name);
-exit_unregister:
- init_completion(&isa_adapter.dev_released); /* Needed? */
- device_unregister(&isa_adapter.dev);
- wait_for_completion(&isa_adapter.dev_released);
exit:
return err;
}
/* Clean up the sysfs representation */
dev_dbg(&isa_adapter.dev, "Unregistering from sysfs\n");
init_completion(&isa_adapter.dev_released);
- init_completion(&isa_adapter.class_dev_released);
- class_device_unregister(&isa_adapter.class_dev);
- device_remove_file(&isa_adapter.dev, &dev_attr_name);
device_unregister(&isa_adapter.dev);
/* Wait for sysfs to drop all references */
dev_dbg(&isa_adapter.dev, "Waiting for sysfs completion\n");
wait_for_completion(&isa_adapter.dev_released);
- wait_for_completion(&isa_adapter.class_dev_released);
dev_dbg(&isa_adapter.dev, "%s unregistered\n", isa_adapter.name);
}
drv_data->adapter.id = I2C_HW_B_IXP2000,
strlcpy(drv_data->adapter.name, plat_dev->dev.driver->name,
- I2C_NAME_SIZE);
+ sizeof(drv_data->adapter.name));
drv_data->adapter.algo_data = &drv_data->algo_data,
drv_data->adapter.dev.parent = &plat_dev->dev;
drv_data->adapter.id = I2C_HW_B_IXP4XX;
drv_data->adapter.class = I2C_CLASS_HWMON;
strlcpy(drv_data->adapter.name, plat_dev->dev.driver->name,
- I2C_NAME_SIZE);
+ sizeof(drv_data->adapter.name));
drv_data->adapter.algo_data = &drv_data->algo_data;
drv_data->adapter.dev.parent = &plat_dev->dev;
}
strlcpy(drv_data->adapter.name, MV64XXX_I2C_CTLR_NAME " adapter",
- I2C_NAME_SIZE);
+ sizeof(drv_data->adapter.name));
init_waitqueue_head(&drv_data->waitq);
spin_lock_init(&drv_data->lock);
nForce4 MCP-04 0034
nForce4 MCP51 0264
nForce4 MCP55 0368
+ nForce MCP61 03EB
+ nForce MCP65 0446
This driver supports the 2 SMBuses that are included in the MCP of the
nForce2/3/4/5xx chipsets.
{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SMBUS) },
{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SMBUS) },
+ { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SMBUS) },
+ { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_SMBUS) },
{ 0 }
};
smbus->adapter.algo = &smbus_algorithm;
smbus->adapter.algo_data = smbus;
smbus->adapter.dev.parent = &dev->dev;
- snprintf(smbus->adapter.name, I2C_NAME_SIZE,
+ snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
"SMBus nForce2 adapter at %04x", smbus->base);
error = i2c_add_adapter(&smbus->adapter);
adap->dev.parent = &pdev->dev;
/* i2c device drivers may be active on return from add_adapter() */
- r = i2c_add_adapter(adap);
+ adap->nr = pdev->id;
+ r = i2c_add_numbered_adapter(adap);
if (r) {
dev_err(dev->dev, "failure adding adapter\n");
goto err_free_irq;
/* ------------------------------------------------------------------------ *
- * i2c-parport.c I2C bus over parallel port *
+ * i2c-parport-light.c I2C bus over parallel port *
* ------------------------------------------------------------------------ *
- Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
+ Copyright (C) 2003-2007 Jean Delvare <khali@linux-fr.org>
Based on older i2c-velleman.c driver
Copyright (C) 1995-2000 Simon G. Vogl
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
+#include <linux/platform_device.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include "i2c-parport.h"
#define DEFAULT_BASE 0x378
+#define DRVNAME "i2c-parport-light"
+
+static struct platform_device *pdev;
static u16 base;
module_param(base, ushort, 0);
.timeout = HZ,
};
-/* ----- I2c structure ---------------------------------------------------- */
+/* ----- Driver registration ---------------------------------------------- */
static struct i2c_adapter parport_adapter = {
.owner = THIS_MODULE,
.name = "Parallel port adapter (light)",
};
-/* ----- Module loading, unloading and information ------------------------ */
+static int __devinit i2c_parport_probe(struct platform_device *pdev)
+{
+ int err;
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!request_region(res->start, res->end - res->start + 1, DRVNAME))
+ return -EBUSY;
+
+ /* Reset hardware to a sane state (SCL and SDA high) */
+ parport_setsda(NULL, 1);
+ parport_setscl(NULL, 1);
+ /* Other init if needed (power on...) */
+ if (adapter_parm[type].init.val)
+ line_set(1, &adapter_parm[type].init);
+
+ parport_adapter.dev.parent = &pdev->dev;
+ err = i2c_bit_add_bus(&parport_adapter);
+ if (err) {
+ dev_err(&pdev->dev, "Unable to register with I2C\n");
+ goto exit_region;
+ }
+ return 0;
+
+exit_region:
+ release_region(res->start, res->end - res->start + 1);
+ return err;
+}
+
+static int __devexit i2c_parport_remove(struct platform_device *pdev)
+{
+ struct resource *res;
+
+ i2c_del_adapter(&parport_adapter);
+
+ /* Un-init if needed (power off...) */
+ if (adapter_parm[type].init.val)
+ line_set(0, &adapter_parm[type].init);
+
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ release_region(res->start, res->end - res->start + 1);
+ return 0;
+}
+
+static struct platform_driver i2c_parport_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = DRVNAME,
+ },
+ .probe = i2c_parport_probe,
+ .remove = __devexit_p(i2c_parport_remove),
+};
+
+static int __init i2c_parport_device_add(u16 address)
+{
+ struct resource res = {
+ .start = address,
+ .end = address + 2,
+ .name = DRVNAME,
+ .flags = IORESOURCE_IO,
+ };
+ int err;
+
+ pdev = platform_device_alloc(DRVNAME, -1);
+ if (!pdev) {
+ err = -ENOMEM;
+ printk(KERN_ERR DRVNAME ": Device allocation failed\n");
+ goto exit;
+ }
+
+ err = platform_device_add_resources(pdev, &res, 1);
+ if (err) {
+ printk(KERN_ERR DRVNAME ": Device resource addition failed "
+ "(%d)\n", err);
+ goto exit_device_put;
+ }
+
+ err = platform_device_add(pdev);
+ if (err) {
+ printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
+ err);
+ goto exit_device_put;
+ }
+
+ return 0;
+
+exit_device_put:
+ platform_device_put(pdev);
+exit:
+ return err;
+}
static int __init i2c_parport_init(void)
{
+ int err;
+
if (type < 0) {
- printk(KERN_WARNING "i2c-parport: adapter type unspecified\n");
+ printk(KERN_ERR DRVNAME ": adapter type unspecified\n");
return -ENODEV;
}
if (type >= ARRAY_SIZE(adapter_parm)) {
- printk(KERN_WARNING "i2c-parport: invalid type (%d)\n", type);
+ printk(KERN_ERR DRVNAME ": invalid type (%d)\n", type);
return -ENODEV;
}
if (base == 0) {
- printk(KERN_INFO "i2c-parport: using default base 0x%x\n", DEFAULT_BASE);
+ pr_info(DRVNAME ": using default base 0x%x\n", DEFAULT_BASE);
base = DEFAULT_BASE;
}
- if (!request_region(base, 3, "i2c-parport"))
- return -ENODEV;
-
if (!adapter_parm[type].getscl.val)
parport_algo_data.getscl = NULL;
- /* Reset hardware to a sane state (SCL and SDA high) */
- parport_setsda(NULL, 1);
- parport_setscl(NULL, 1);
- /* Other init if needed (power on...) */
- if (adapter_parm[type].init.val)
- line_set(1, &adapter_parm[type].init);
+ /* Sets global pdev as a side effect */
+ err = i2c_parport_device_add(base);
+ if (err)
+ goto exit;
- if (i2c_bit_add_bus(&parport_adapter) < 0) {
- printk(KERN_ERR "i2c-parport: Unable to register with I2C\n");
- release_region(base, 3);
- return -ENODEV;
- }
+ err = platform_driver_register(&i2c_parport_driver);
+ if (err)
+ goto exit_device;
return 0;
+
+exit_device:
+ platform_device_unregister(pdev);
+exit:
+ return err;
}
static void __exit i2c_parport_exit(void)
{
- /* Un-init if needed (power off...) */
- if (adapter_parm[type].init.val)
- line_set(0, &adapter_parm[type].init);
-
- i2c_del_adapter(&parport_adapter);
- release_region(base, 3);
+ platform_driver_unregister(&i2c_parport_driver);
+ platform_device_unregister(pdev);
}
MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
/* ------------------------------------------------------------------------ *
* i2c-parport.c I2C bus over parallel port *
* ------------------------------------------------------------------------ *
- Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
+ Copyright (C) 2003-2007 Jean Delvare <khali@linux-fr.org>
Based on older i2c-philips-par.c driver
Copyright (C) 1995-2000 Simon G. Vogl
.setscl = parport_setscl,
.getsda = parport_getsda,
.getscl = parport_getscl,
- .udelay = 60,
+ .udelay = 10, /* ~50 kbps */
.timeout = HZ,
};
/* ----- I2c and parallel port call-back functions and structures --------- */
-static struct i2c_adapter parport_adapter = {
- .owner = THIS_MODULE,
- .class = I2C_CLASS_HWMON,
- .id = I2C_HW_B_LP,
- .name = "Parallel port adapter",
-};
-
static void i2c_parport_attach (struct parport *port)
{
struct i2c_par *adapter;
}
/* Fill the rest of the structure */
- adapter->adapter = parport_adapter;
+ adapter->adapter.owner = THIS_MODULE;
+ adapter->adapter.class = I2C_CLASS_HWMON;
+ adapter->adapter.id = I2C_HW_B_LP;
+ strlcpy(adapter->adapter.name, "Parallel port adapter",
+ sizeof(adapter->adapter.name));
adapter->algo_data = parport_algo_data;
- if (!adapter_parm[type].getscl.val)
+ /* Slow down if we can't sense SCL */
+ if (!adapter_parm[type].getscl.val) {
adapter->algo_data.getscl = NULL;
+ adapter->algo_data.udelay = 50; /* ~10 kbps */
+ }
adapter->algo_data.data = port;
adapter->adapter.algo_data = &adapter->algo_data;
for (prev = NULL, adapter = adapter_list; adapter;
prev = adapter, adapter = adapter->next) {
if (adapter->pdev->port == port) {
+ i2c_del_adapter(&adapter->adapter);
+
/* Un-init if needed (power off...) */
if (adapter_parm[type].init.val)
line_set(port, 0, &adapter_parm[type].init);
- i2c_del_adapter(&adapter->adapter);
parport_unregister_device(adapter->pdev);
if (prev)
prev->next = adapter->next;
}
smbus->adapter.owner = THIS_MODULE;
- snprintf(smbus->adapter.name, I2C_NAME_SIZE,
+ snprintf(smbus->adapter.name, sizeof(smbus->adapter.name),
"PA Semi SMBus adapter at 0x%lx", smbus->base);
smbus->adapter.class = I2C_CLASS_HWMON;
smbus->adapter.algo = &smbus_algorithm;
#include <linux/pci.h>
#include <linux/wait.h>
+#include <linux/isa.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-pca.h>
.name = "PCA9564 ISA Adapter",
};
-static int __init pca_isa_init(void)
+static int __devinit pca_isa_probe(struct device *dev, unsigned int id)
{
-
init_waitqueue_head(&pca_wait);
- printk(KERN_INFO "i2c-pca-isa: i/o base %#08lx. irq %d\n", base, irq);
+ dev_info(dev, "i/o base %#08lx. irq %d\n", base, irq);
if (!request_region(base, IO_SIZE, "i2c-pca-isa")) {
- printk(KERN_ERR "i2c-pca-isa: I/O address %#08lx is in use.\n", base);
+ dev_err(dev, "I/O address %#08lx is in use\n", base);
goto out;
}
if (irq > -1) {
if (request_irq(irq, pca_handler, 0, "i2c-pca-isa", &pca_isa_ops) < 0) {
- printk(KERN_ERR "i2c-pca-isa: Request irq%d failed\n", irq);
+ dev_err(dev, "Request irq%d failed\n", irq);
goto out_region;
}
}
if (i2c_pca_add_bus(&pca_isa_ops) < 0) {
- printk(KERN_ERR "i2c-pca-isa: Failed to add i2c bus\n");
+ dev_err(dev, "Failed to add i2c bus\n");
goto out_irq;
}
return -ENODEV;
}
-static void pca_isa_exit(void)
+static int __devexit pca_isa_remove(struct device *dev, unsigned int id)
{
i2c_del_adapter(&pca_isa_ops);
free_irq(irq, &pca_isa_ops);
}
release_region(base, IO_SIZE);
+
+ return 0;
+}
+
+static struct isa_driver pca_isa_driver = {
+ .probe = pca_isa_probe,
+ .remove = __devexit_p(pca_isa_remove),
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "i2c-pca-isa",
+ }
+};
+
+static int __init pca_isa_init(void)
+{
+ return isa_register_driver(&pca_isa_driver, 1);
+}
+
+static void __exit pca_isa_exit(void)
+{
+ isa_unregister_driver(&pca_isa_driver);
}
MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>");
/* set up the sysfs linkage to our parent device */
piix4_adapter.dev.parent = &dev->dev;
- snprintf(piix4_adapter.name, I2C_NAME_SIZE,
+ snprintf(piix4_adapter.name, sizeof(piix4_adapter.name),
"SMBus PIIX4 adapter at %04x", piix4_smba);
if ((retval = i2c_add_adapter(&piix4_adapter))) {
writel(icr | ICR_START | ICR_TB, _ICR(i2c));
}
+static inline void i2c_pxa_stop_message(struct pxa_i2c *i2c)
+{
+ u32 icr;
+
+ /*
+ * Clear the STOP and ACK flags
+ */
+ icr = readl(_ICR(i2c));
+ icr &= ~(ICR_STOP | ICR_ACKNAK);
+ writel(icr, _IRC(i2c));
+}
+
/*
* We are protected by the adapter bus mutex.
*/
* The rest of the processing occurs in the interrupt handler.
*/
timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5);
+ i2c_pxa_stop_message(i2c);
/*
* We place the return code in i2c->msg_idx.
};
static struct pxa_i2c i2c_pxa = {
- .lock = SPIN_LOCK_UNLOCKED,
+ .lock = __SPIN_LOCK_UNLOCKED(i2c_pxa.lock),
.adap = {
.owner = THIS_MODULE,
.algo = &i2c_pxa_algorithm,
unsigned int msg_idx;
unsigned int msg_ptr;
+ unsigned int tx_setup;
+
enum s3c24xx_i2c_state state;
void __iomem *regs;
dev_dbg(i2c->dev, "START: %08lx to IICSTAT, %02x to DS\n", stat, addr);
writeb(addr, i2c->regs + S3C2410_IICDS);
- // delay a bit and reset iiccon before setting start (per samsung)
- udelay(1);
+ /* delay here to ensure the data byte has gotten onto the bus
+ * before the transaction is started */
+
+ ndelay(i2c->tx_setup);
+
dev_dbg(i2c->dev, "iiccon, %08lx\n", iiccon);
writel(iiccon, i2c->regs + S3C2410_IICCON);
if (!is_msgend(i2c)) {
byte = i2c->msg->buf[i2c->msg_ptr++];
writeb(byte, i2c->regs + S3C2410_IICDS);
-
+
+ /* delay after writing the byte to allow the
+ * data setup time on the bus, as writing the
+ * data to the register causes the first bit
+ * to appear on SDA, and SCL will change as
+ * soon as the interrupt is acknowledged */
+
+ ndelay(i2c->tx_setup);
+
} else if (!is_lastmsg(i2c)) {
/* we need to go to the next i2c message */
};
static struct s3c24xx_i2c s3c24xx_i2c = {
- .lock = SPIN_LOCK_UNLOCKED,
- .wait = __WAIT_QUEUE_HEAD_INITIALIZER(s3c24xx_i2c.wait),
- .adap = {
+ .lock = __SPIN_LOCK_UNLOCKED(s3c24xx_i2c.lock),
+ .wait = __WAIT_QUEUE_HEAD_INITIALIZER(s3c24xx_i2c.wait),
+ .tx_setup = 50,
+ .adap = {
.name = "s3c2410-i2c",
.owner = THIS_MODULE,
.algo = &s3c24xx_i2c_algorithm,
return 0;
}
-static void s3c24xx_i2c_free(struct s3c24xx_i2c *i2c)
-{
- if (i2c->clk != NULL && !IS_ERR(i2c->clk)) {
- clk_disable(i2c->clk);
- clk_put(i2c->clk);
- i2c->clk = NULL;
- }
-
- if (i2c->regs != NULL) {
- iounmap(i2c->regs);
- i2c->regs = NULL;
- }
-
- if (i2c->ioarea != NULL) {
- release_resource(i2c->ioarea);
- kfree(i2c->ioarea);
- i2c->ioarea = NULL;
- }
-}
-
/* s3c24xx_i2c_probe
*
* called by the bus driver when a suitable device is found
if (IS_ERR(i2c->clk)) {
dev_err(&pdev->dev, "cannot get clock\n");
ret = -ENOENT;
- goto out;
+ goto err_noclk;
}
dev_dbg(&pdev->dev, "clock source %p\n", i2c->clk);
if (res == NULL) {
dev_err(&pdev->dev, "cannot find IO resource\n");
ret = -ENOENT;
- goto out;
+ goto err_clk;
}
i2c->ioarea = request_mem_region(res->start, (res->end-res->start)+1,
if (i2c->ioarea == NULL) {
dev_err(&pdev->dev, "cannot request IO\n");
ret = -ENXIO;
- goto out;
+ goto err_clk;
}
i2c->regs = ioremap(res->start, (res->end-res->start)+1);
if (i2c->regs == NULL) {
dev_err(&pdev->dev, "cannot map IO\n");
ret = -ENXIO;
- goto out;
+ goto err_ioarea;
}
dev_dbg(&pdev->dev, "registers %p (%p, %p)\n", i2c->regs, i2c->ioarea, res);
ret = s3c24xx_i2c_init(i2c);
if (ret != 0)
- goto out;
+ goto err_iomap;
/* find the IRQ for this unit (note, this relies on the init call to
* ensure no current IRQs pending
if (res == NULL) {
dev_err(&pdev->dev, "cannot find IRQ\n");
ret = -ENOENT;
- goto out;
+ goto err_iomap;
}
ret = request_irq(res->start, s3c24xx_i2c_irq, IRQF_DISABLED,
if (ret != 0) {
dev_err(&pdev->dev, "cannot claim IRQ\n");
- goto out;
+ goto err_iomap;
}
i2c->irq = res;
ret = i2c_add_adapter(&i2c->adap);
if (ret < 0) {
dev_err(&pdev->dev, "failed to add bus to i2c core\n");
- goto out;
+ goto err_irq;
}
platform_set_drvdata(pdev, i2c);
dev_info(&pdev->dev, "%s: S3C I2C adapter\n", i2c->adap.dev.bus_id);
+ return 0;
- out:
- if (ret < 0)
- s3c24xx_i2c_free(i2c);
+ err_irq:
+ free_irq(i2c->irq->start, i2c);
+
+ err_iomap:
+ iounmap(i2c->regs);
+ err_ioarea:
+ release_resource(i2c->ioarea);
+ kfree(i2c->ioarea);
+
+ err_clk:
+ clk_disable(i2c->clk);
+ clk_put(i2c->clk);
+
+ err_noclk:
return ret;
}
static int s3c24xx_i2c_remove(struct platform_device *pdev)
{
struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev);
-
- if (i2c != NULL) {
- s3c24xx_i2c_free(i2c);
- platform_set_drvdata(pdev, NULL);
- }
+
+ i2c_del_adapter(&i2c->adap);
+ free_irq(i2c->irq->start, i2c);
+
+ clk_disable(i2c->clk);
+ clk_put(i2c->clk);
+
+ iounmap(i2c->regs);
+
+ release_resource(i2c->ioarea);
+ kfree(i2c->ioarea);
return 0;
}
--- /dev/null
+/*
+ * Copyright (C) 2005 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ *
+ * Simtec Generic I2C Controller
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+#include <asm/io.h>
+
+struct simtec_i2c_data {
+ struct resource *ioarea;
+ void __iomem *reg;
+ struct i2c_adapter adap;
+ struct i2c_algo_bit_data bit;
+};
+
+#define CMD_SET_SDA (1<<2)
+#define CMD_SET_SCL (1<<3)
+
+#define STATE_SDA (1<<0)
+#define STATE_SCL (1<<1)
+
+/* i2c bit-bus functions */
+
+static void simtec_i2c_setsda(void *pw, int state)
+{
+ struct simtec_i2c_data *pd = pw;
+ writeb(CMD_SET_SDA | (state ? STATE_SDA : 0), pd->reg);
+}
+
+static void simtec_i2c_setscl(void *pw, int state)
+{
+ struct simtec_i2c_data *pd = pw;
+ writeb(CMD_SET_SCL | (state ? STATE_SCL : 0), pd->reg);
+}
+
+static int simtec_i2c_getsda(void *pw)
+{
+ struct simtec_i2c_data *pd = pw;
+ return readb(pd->reg) & STATE_SDA ? 1 : 0;
+}
+
+static int simtec_i2c_getscl(void *pw)
+{
+ struct simtec_i2c_data *pd = pw;
+ return readb(pd->reg) & STATE_SCL ? 1 : 0;
+}
+
+/* device registration */
+
+static int simtec_i2c_probe(struct platform_device *dev)
+{
+ struct simtec_i2c_data *pd;
+ struct resource *res;
+ int size;
+ int ret;
+
+ pd = kzalloc(sizeof(struct simtec_i2c_data), GFP_KERNEL);
+ if (pd == NULL) {
+ dev_err(&dev->dev, "cannot allocate private data\n");
+ return -ENOMEM;
+ }
+
+ platform_set_drvdata(dev, pd);
+
+ res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(&dev->dev, "cannot find IO resource\n");
+ ret = -ENOENT;
+ goto err;
+ }
+
+ size = (res->end-res->start)+1;
+
+ pd->ioarea = request_mem_region(res->start, size, dev->name);
+ if (pd->ioarea == NULL) {
+ dev_err(&dev->dev, "cannot request IO\n");
+ ret = -ENXIO;
+ goto err;
+ }
+
+ pd->reg = ioremap(res->start, size);
+ if (pd->reg == NULL) {
+ dev_err(&dev->dev, "cannot map IO\n");
+ ret = -ENXIO;
+ goto err_res;
+ }
+
+ /* setup the private data */
+
+ pd->adap.owner = THIS_MODULE;
+ pd->adap.algo_data = &pd->bit;
+ pd->adap.dev.parent = &dev->dev;
+
+ strlcpy(pd->adap.name, "Simtec I2C", sizeof(pd->adap.name));
+
+ pd->bit.data = pd;
+ pd->bit.setsda = simtec_i2c_setsda;
+ pd->bit.setscl = simtec_i2c_setscl;
+ pd->bit.getsda = simtec_i2c_getsda;
+ pd->bit.getscl = simtec_i2c_getscl;
+ pd->bit.timeout = HZ;
+ pd->bit.udelay = 20;
+
+ ret = i2c_bit_add_bus(&pd->adap);
+ if (ret)
+ goto err_all;
+
+ return 0;
+
+ err_all:
+ iounmap(pd->reg);
+
+ err_res:
+ release_resource(pd->ioarea);
+ kfree(pd->ioarea);
+
+ err:
+ kfree(pd);
+ return ret;
+}
+
+static int simtec_i2c_remove(struct platform_device *dev)
+{
+ struct simtec_i2c_data *pd = platform_get_drvdata(dev);
+
+ i2c_del_adapter(&pd->adap);
+
+ iounmap(pd->reg);
+ release_resource(pd->ioarea);
+ kfree(pd->ioarea);
+ kfree(pd);
+
+ return 0;
+}
+
+
+/* device driver */
+
+static struct platform_driver simtec_i2c_driver = {
+ .driver = {
+ .name = "simtec-i2c",
+ .owner = THIS_MODULE,
+ },
+ .probe = simtec_i2c_probe,
+ .remove = simtec_i2c_remove,
+};
+
+static int __init i2c_adap_simtec_init(void)
+{
+ return platform_driver_register(&simtec_i2c_driver);
+}
+
+static void __exit i2c_adap_simtec_exit(void)
+{
+ platform_driver_unregister(&simtec_i2c_driver);
+}
+
+module_init(i2c_adap_simtec_init);
+module_exit(i2c_adap_simtec_exit);
+
+MODULE_DESCRIPTION("Simtec Generic I2C Bus driver");
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL");
/* set up the sysfs linkage to our parent device */
sis96x_adapter.dev.parent = &dev->dev;
- snprintf(sis96x_adapter.name, I2C_NAME_SIZE,
+ snprintf(sis96x_adapter.name, sizeof(sis96x_adapter.name),
"SiS96x SMBus adapter at 0x%04x", sis96x_smbus_base);
if ((retval = i2c_add_adapter(&sis96x_adapter))) {
--- /dev/null
+/*
+ * driver for the i2c-tiny-usb adapter - 1.0
+ * http://www.harbaum.org/till/i2c_tiny_usb
+ *
+ * Copyright (C) 2006-2007 Till Harbaum (Till@Harbaum.org)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+
+/* include interfaces to usb layer */
+#include <linux/usb.h>
+
+/* include interface to i2c layer */
+#include <linux/i2c.h>
+
+/* commands via USB, must match command ids in the firmware */
+#define CMD_ECHO 0
+#define CMD_GET_FUNC 1
+#define CMD_SET_DELAY 2
+#define CMD_GET_STATUS 3
+
+#define CMD_I2C_IO 4
+#define CMD_I2C_IO_BEGIN (1<<0)
+#define CMD_I2C_IO_END (1<<1)
+
+/* i2c bit delay, default is 10us -> 100kHz */
+static int delay = 10;
+module_param(delay, int, 0);
+MODULE_PARM_DESC(delay, "bit delay in microseconds, "
+ "e.g. 10 for 100kHz (default is 100kHz)");
+
+static int usb_read(struct i2c_adapter *adapter, int cmd,
+ int value, int index, void *data, int len);
+
+static int usb_write(struct i2c_adapter *adapter, int cmd,
+ int value, int index, void *data, int len);
+
+/* ----- begin of i2c layer ---------------------------------------------- */
+
+#define STATUS_IDLE 0
+#define STATUS_ADDRESS_ACK 1
+#define STATUS_ADDRESS_NAK 2
+
+static int usb_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
+{
+ unsigned char status;
+ struct i2c_msg *pmsg;
+ int i;
+
+ dev_dbg(&adapter->dev, "master xfer %d messages:\n", num);
+
+ for (i = 0 ; i < num ; i++) {
+ int cmd = CMD_I2C_IO;
+
+ if (i == 0)
+ cmd |= CMD_I2C_IO_BEGIN;
+
+ if (i == num-1)
+ cmd |= CMD_I2C_IO_END;
+
+ pmsg = &msgs[i];
+
+ dev_dbg(&adapter->dev,
+ " %d: %s (flags %d) %d bytes to 0x%02x\n",
+ i, pmsg->flags & I2C_M_RD ? "read" : "write",
+ pmsg->flags, pmsg->len, pmsg->addr);
+
+ /* and directly send the message */
+ if (pmsg->flags & I2C_M_RD) {
+ /* read data */
+ if (usb_read(adapter, cmd,
+ pmsg->flags, pmsg->addr,
+ pmsg->buf, pmsg->len) != pmsg->len) {
+ dev_err(&adapter->dev,
+ "failure reading data\n");
+ return -EREMOTEIO;
+ }
+ } else {
+ /* write data */
+ if (usb_write(adapter, cmd,
+ pmsg->flags, pmsg->addr,
+ pmsg->buf, pmsg->len) != pmsg->len) {
+ dev_err(&adapter->dev,
+ "failure writing data\n");
+ return -EREMOTEIO;
+ }
+ }
+
+ /* read status */
+ if (usb_read(adapter, CMD_GET_STATUS, 0, 0, &status, 1) != 1) {
+ dev_err(&adapter->dev, "failure reading status\n");
+ return -EREMOTEIO;
+ }
+
+ dev_dbg(&adapter->dev, " status = %d\n", status);
+ if (status == STATUS_ADDRESS_NAK)
+ return -EREMOTEIO;
+ }
+
+ return i;
+}
+
+static u32 usb_func(struct i2c_adapter *adapter)
+{
+ u32 func;
+
+ /* get functionality from adapter */
+ if (usb_read(adapter, CMD_GET_FUNC, 0, 0, &func, sizeof(func)) !=
+ sizeof(func)) {
+ dev_err(&adapter->dev, "failure reading functionality\n");
+ return 0;
+ }
+
+ return func;
+}
+
+/* This is the actual algorithm we define */
+static const struct i2c_algorithm usb_algorithm = {
+ .master_xfer = usb_xfer,
+ .functionality = usb_func,
+};
+
+/* ----- end of i2c layer ------------------------------------------------ */
+
+/* ----- begin of usb layer ---------------------------------------------- */
+
+/* The usb i2c interface uses a vid/pid pair donated by */
+/* Future Technology Devices International Ltd. */
+static struct usb_device_id i2c_tiny_usb_table [] = {
+ { USB_DEVICE(0x0403, 0xc631) },
+ { } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, i2c_tiny_usb_table);
+
+/* Structure to hold all of our device specific stuff */
+struct i2c_tiny_usb {
+ struct usb_device *usb_dev; /* the usb device for this device */
+ struct usb_interface *interface; /* the interface for this device */
+ struct i2c_adapter adapter; /* i2c related things */
+};
+
+static int usb_read(struct i2c_adapter *adapter, int cmd,
+ int value, int index, void *data, int len)
+{
+ struct i2c_tiny_usb *dev = (struct i2c_tiny_usb *)adapter->algo_data;
+
+ /* do control transfer */
+ return usb_control_msg(dev->usb_dev, usb_rcvctrlpipe(dev->usb_dev, 0),
+ cmd, USB_TYPE_VENDOR | USB_RECIP_INTERFACE |
+ USB_DIR_IN, value, index, data, len, 2000);
+}
+
+static int usb_write(struct i2c_adapter *adapter, int cmd,
+ int value, int index, void *data, int len)
+{
+ struct i2c_tiny_usb *dev = (struct i2c_tiny_usb *)adapter->algo_data;
+
+ /* do control transfer */
+ return usb_control_msg(dev->usb_dev, usb_sndctrlpipe(dev->usb_dev, 0),
+ cmd, USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
+ value, index, data, len, 2000);
+}
+
+static void i2c_tiny_usb_free(struct i2c_tiny_usb *dev)
+{
+ usb_put_dev(dev->usb_dev);
+ kfree(dev);
+}
+
+static int i2c_tiny_usb_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ struct i2c_tiny_usb *dev;
+ int retval = -ENOMEM;
+ u16 version;
+
+ dev_dbg(&interface->dev, "probing usb device\n");
+
+ /* allocate memory for our device state and initialize it */
+ dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ if (dev == NULL) {
+ dev_err(&interface->dev, "Out of memory\n");
+ goto error;
+ }
+
+ dev->usb_dev = usb_get_dev(interface_to_usbdev(interface));
+ dev->interface = interface;
+
+ /* save our data pointer in this interface device */
+ usb_set_intfdata(interface, dev);
+
+ version = le16_to_cpu(dev->usb_dev->descriptor.bcdDevice);
+ dev_info(&interface->dev,
+ "version %x.%02x found at bus %03d address %03d\n",
+ version >> 8, version & 0xff,
+ dev->usb_dev->bus->busnum, dev->usb_dev->devnum);
+
+ /* setup i2c adapter description */
+ dev->adapter.owner = THIS_MODULE;
+ dev->adapter.class = I2C_CLASS_HWMON;
+ dev->adapter.algo = &usb_algorithm;
+ dev->adapter.algo_data = dev;
+ snprintf(dev->adapter.name, I2C_NAME_SIZE,
+ "i2c-tiny-usb at bus %03d device %03d",
+ dev->usb_dev->bus->busnum, dev->usb_dev->devnum);
+
+ if (usb_write(&dev->adapter, CMD_SET_DELAY,
+ cpu_to_le16(delay), 0, NULL, 0) != 0) {
+ dev_err(&dev->adapter.dev,
+ "failure setting delay to %dus\n", delay);
+ retval = -EIO;
+ goto error;
+ }
+
+ dev->adapter.dev.parent = &dev->interface->dev;
+
+ /* and finally attach to i2c layer */
+ i2c_add_adapter(&dev->adapter);
+
+ /* inform user about successful attachment to i2c layer */
+ dev_info(&dev->adapter.dev, "connected i2c-tiny-usb device\n");
+
+ return 0;
+
+ error:
+ if (dev)
+ i2c_tiny_usb_free(dev);
+
+ return retval;
+}
+
+static void i2c_tiny_usb_disconnect(struct usb_interface *interface)
+{
+ struct i2c_tiny_usb *dev = usb_get_intfdata(interface);
+
+ i2c_del_adapter(&dev->adapter);
+ usb_set_intfdata(interface, NULL);
+ i2c_tiny_usb_free(dev);
+
+ dev_dbg(&interface->dev, "disconnected\n");
+}
+
+static struct usb_driver i2c_tiny_usb_driver = {
+ .name = "i2c-tiny-usb",
+ .probe = i2c_tiny_usb_probe,
+ .disconnect = i2c_tiny_usb_disconnect,
+ .id_table = i2c_tiny_usb_table,
+};
+
+static int __init usb_i2c_tiny_usb_init(void)
+{
+ /* register this driver with the USB subsystem */
+ return usb_register(&i2c_tiny_usb_driver);
+}
+
+static void __exit usb_i2c_tiny_usb_exit(void)
+{
+ /* deregister this driver with the USB subsystem */
+ usb_deregister(&i2c_tiny_usb_driver);
+}
+
+module_init(usb_i2c_tiny_usb_init);
+module_exit(usb_i2c_tiny_usb_exit);
+
+/* ----- end of usb layer ------------------------------------------------ */
+
+MODULE_AUTHOR("Till Harbaum <Till@Harbaum.org>");
+MODULE_DESCRIPTION("i2c-tiny-usb driver v1.0");
+MODULE_LICENSE("GPL");
}
vt596_adapter.dev.parent = &pdev->dev;
- snprintf(vt596_adapter.name, I2C_NAME_SIZE,
+ snprintf(vt596_adapter.name, sizeof(vt596_adapter.name),
"SMBus Via Pro adapter at %04x", vt596_smba);
vt596_pdev = pci_dev_get(pdev);
adapter = &iface->adapter;
i2c_set_adapdata(adapter, iface);
- snprintf(adapter->name, I2C_NAME_SIZE, "%s ACB%d", text, index);
+ snprintf(adapter->name, sizeof(adapter->name), "%s ACB%d", text, index);
adapter->owner = THIS_MODULE;
adapter->id = I2C_HW_SMBUS_SCX200;
adapter->algo = &scx200_acb_algorithm;
else {
int i;
+ pci_dev_put(pdev);
for (i = 0; i < MAX_DEVICES; ++i) {
if (base[i] == 0)
continue;
#
menu "Miscellaneous I2C Chip support"
- depends on I2C
config SENSORS_DS1337
tristate "Dallas Semiconductor DS1337 and DS1339 Real Time Clock"
- depends on I2C && EXPERIMENTAL
+ depends on EXPERIMENTAL
help
If you say yes here you get support for Dallas Semiconductor
DS1337 and DS1339 real-time clock chips.
config SENSORS_DS1374
tristate "Maxim/Dallas Semiconductor DS1374 Real Time Clock"
- depends on I2C && EXPERIMENTAL
+ depends on EXPERIMENTAL
help
If you say yes here you get support for Dallas Semiconductor
DS1374 real-time clock chips.
config SENSORS_EEPROM
tristate "EEPROM reader"
- depends on I2C && EXPERIMENTAL
+ depends on EXPERIMENTAL
help
If you say yes here you get read-only access to the EEPROM data
available on modern memory DIMMs and Sony Vaio laptops. Such
config SENSORS_PCF8574
tristate "Philips PCF8574 and PCF8574A"
- depends on I2C && EXPERIMENTAL
+ depends on EXPERIMENTAL
default n
help
If you say yes here you get support for Philips PCF8574 and
config SENSORS_PCA9539
tristate "Philips PCA9539 16-bit I/O port"
- depends on I2C && EXPERIMENTAL
+ depends on EXPERIMENTAL
help
If you say yes here you get support for the Philips PCA9539
16-bit I/O port.
config SENSORS_PCF8591
tristate "Philips PCF8591"
- depends on I2C && EXPERIMENTAL
+ depends on EXPERIMENTAL
default n
help
If you say yes here you get support for Philips PCF8591 chips.
config ISP1301_OMAP
tristate "Philips ISP1301 with OMAP OTG"
- depends on I2C && ARCH_OMAP_OTG
+ depends on ARCH_OMAP_OTG
help
If you say yes here you get support for the Philips ISP1301
USB-On-The-Go transceiver working with the OMAP OTG controller.
# and having mostly OMAP-specific board support
config TPS65010
tristate "TPS6501x Power Management chips"
- depends on I2C && ARCH_OMAP
+ depends on ARCH_OMAP
default y if MACH_OMAP_H2 || MACH_OMAP_H3 || MACH_OMAP_OSK
help
If you say yes here you get support for the TPS6501x series of
config SENSORS_M41T00
tristate "ST M41T00 RTC chip"
- depends on I2C && PPC32
+ depends on PPC32
help
If you say yes here you get support for the ST M41T00 RTC chip.
config SENSORS_MAX6875
tristate "Maxim MAX6875 Power supply supervisor"
- depends on I2C && EXPERIMENTAL
+ depends on EXPERIMENTAL
help
If you say yes here you get support for the Maxim MAX6875
EEPROM-programmable, quad power-supply sequencer/supervisor.
--- /dev/null
+/*
+ * i2c-boardinfo.h - collect pre-declarations of I2C devices
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/i2c.h>
+
+#include "i2c-core.h"
+
+
+/* These symbols are exported ONLY FOR the i2c core.
+ * No other users will be supported.
+ */
+DEFINE_MUTEX(__i2c_board_lock);
+EXPORT_SYMBOL_GPL(__i2c_board_lock);
+
+LIST_HEAD(__i2c_board_list);
+EXPORT_SYMBOL_GPL(__i2c_board_list);
+
+int __i2c_first_dynamic_bus_num;
+EXPORT_SYMBOL_GPL(__i2c_first_dynamic_bus_num);
+
+
+/**
+ * i2c_register_board_info - statically declare I2C devices
+ * @busnum: identifies the bus to which these devices belong
+ * @info: vector of i2c device descriptors
+ * @len: how many descriptors in the vector; may be zero to reserve
+ * the specified bus number.
+ *
+ * Systems using the Linux I2C driver stack can declare tables of board info
+ * while they initialize. This should be done in board-specific init code
+ * near arch_initcall() time, or equivalent, before any I2C adapter driver is
+ * registered. For example, mainboard init code could define several devices,
+ * as could the init code for each daughtercard in a board stack.
+ *
+ * The I2C devices will be created later, after the adapter for the relevant
+ * bus has been registered. After that moment, standard driver model tools
+ * are used to bind "new style" I2C drivers to the devices. The bus number
+ * for any device declared using this routine is not available for dynamic
+ * allocation.
+ *
+ * The board info passed can safely be __initdata, but be careful of embedded
+ * pointers (for platform_data, functions, etc) since that won't be copied.
+ */
+int __init
+i2c_register_board_info(int busnum,
+ struct i2c_board_info const *info, unsigned len)
+{
+ int status;
+
+ mutex_lock(&__i2c_board_lock);
+
+ /* dynamic bus numbers will be assigned after the last static one */
+ if (busnum >= __i2c_first_dynamic_bus_num)
+ __i2c_first_dynamic_bus_num = busnum + 1;
+
+ for (status = 0; len; len--, info++) {
+ struct i2c_devinfo *devinfo;
+
+ devinfo = kzalloc(sizeof(*devinfo), GFP_KERNEL);
+ if (!devinfo) {
+ pr_debug("i2c-core: can't register boardinfo!\n");
+ status = -ENOMEM;
+ break;
+ }
+
+ devinfo->busnum = busnum;
+ devinfo->board_info = *info;
+ list_add_tail(&devinfo->list, &__i2c_board_list);
+ }
+
+ mutex_unlock(&__i2c_board_lock);
+
+ return status;
+}
#include <linux/completion.h>
#include <asm/uaccess.h>
+#include "i2c-core.h"
+
static LIST_HEAD(adapters);
static LIST_HEAD(drivers);
static DEFINE_MUTEX(core_lists);
static DEFINE_IDR(i2c_adapter_idr);
+#define is_newstyle_driver(d) ((d)->probe || (d)->remove)
/* ------------------------------------------------------------------------- */
-/* match always succeeds, as we want the probe() to tell if we really accept this match */
static int i2c_device_match(struct device *dev, struct device_driver *drv)
{
- return 1;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct i2c_driver *driver = to_i2c_driver(drv);
+
+ /* make legacy i2c drivers bypass driver model probing entirely;
+ * such drivers scan each i2c adapter/bus themselves.
+ */
+ if (!is_newstyle_driver(driver))
+ return 0;
+
+ /* new style drivers use the same kind of driver matching policy
+ * as platform devices or SPI: compare device and driver IDs.
+ */
+ return strcmp(client->driver_name, drv->name) == 0;
+}
+
+#ifdef CONFIG_HOTPLUG
+
+/* uevent helps with hotplug: modprobe -q $(MODALIAS) */
+static int i2c_device_uevent(struct device *dev, char **envp, int num_envp,
+ char *buffer, int buffer_size)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int i = 0, length = 0;
+
+ /* by definition, legacy drivers can't hotplug */
+ if (dev->driver || !client->driver_name)
+ return 0;
+
+ if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
+ "MODALIAS=%s", client->driver_name))
+ return -ENOMEM;
+ envp[i] = NULL;
+ dev_dbg(dev, "uevent\n");
+ return 0;
}
+#else
+#define i2c_device_uevent NULL
+#endif /* CONFIG_HOTPLUG */
+
static int i2c_device_probe(struct device *dev)
{
- return -ENODEV;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct i2c_driver *driver = to_i2c_driver(dev->driver);
+
+ if (!driver->probe)
+ return -ENODEV;
+ client->driver = driver;
+ dev_dbg(dev, "probe\n");
+ return driver->probe(client);
}
static int i2c_device_remove(struct device *dev)
{
- return 0;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct i2c_driver *driver;
+ int status;
+
+ if (!dev->driver)
+ return 0;
+
+ driver = to_i2c_driver(dev->driver);
+ if (driver->remove) {
+ dev_dbg(dev, "remove\n");
+ status = driver->remove(client);
+ } else {
+ dev->driver = NULL;
+ status = 0;
+ }
+ if (status == 0)
+ client->driver = NULL;
+ return status;
}
static void i2c_device_shutdown(struct device *dev)
return driver->resume(to_i2c_client(dev));
}
+static void i2c_client_release(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ complete(&client->released);
+}
+
+static void i2c_client_dev_release(struct device *dev)
+{
+ kfree(to_i2c_client(dev));
+}
+
+static ssize_t show_client_name(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ return sprintf(buf, "%s\n", client->name);
+}
+
+static ssize_t show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ return client->driver_name
+ ? sprintf(buf, "%s\n", client->driver_name)
+ : 0;
+}
+
+static struct device_attribute i2c_dev_attrs[] = {
+ __ATTR(name, S_IRUGO, show_client_name, NULL),
+ /* modalias helps coldplug: modprobe $(cat .../modalias) */
+ __ATTR(modalias, S_IRUGO, show_modalias, NULL),
+ { },
+};
+
struct bus_type i2c_bus_type = {
.name = "i2c",
+ .dev_attrs = i2c_dev_attrs,
.match = i2c_device_match,
+ .uevent = i2c_device_uevent,
.probe = i2c_device_probe,
.remove = i2c_device_remove,
.shutdown = i2c_device_shutdown,
.suspend = i2c_device_suspend,
.resume = i2c_device_resume,
};
+EXPORT_SYMBOL_GPL(i2c_bus_type);
-/* ------------------------------------------------------------------------- */
+/**
+ * i2c_new_device - instantiate an i2c device for use with a new style driver
+ * @adap: the adapter managing the device
+ * @info: describes one I2C device; bus_num is ignored
+ *
+ * Create a device to work with a new style i2c driver, where binding is
+ * handled through driver model probe()/remove() methods. This call is not
+ * appropriate for use by mainboad initialization logic, which usually runs
+ * during an arch_initcall() long before any i2c_adapter could exist.
+ *
+ * This returns the new i2c client, which may be saved for later use with
+ * i2c_unregister_device(); or NULL to indicate an error.
+ */
+struct i2c_client *
+i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info)
+{
+ struct i2c_client *client;
+ int status;
-void i2c_adapter_dev_release(struct device *dev)
+ client = kzalloc(sizeof *client, GFP_KERNEL);
+ if (!client)
+ return NULL;
+
+ client->adapter = adap;
+
+ client->dev.platform_data = info->platform_data;
+ client->flags = info->flags;
+ client->addr = info->addr;
+ client->irq = info->irq;
+
+ strlcpy(client->driver_name, info->driver_name,
+ sizeof(client->driver_name));
+ strlcpy(client->name, info->type, sizeof(client->name));
+
+ /* a new style driver may be bound to this device when we
+ * return from this function, or any later moment (e.g. maybe
+ * hotplugging will load the driver module). and the device
+ * refcount model is the standard driver model one.
+ */
+ status = i2c_attach_client(client);
+ if (status < 0) {
+ kfree(client);
+ client = NULL;
+ }
+ return client;
+}
+EXPORT_SYMBOL_GPL(i2c_new_device);
+
+
+/**
+ * i2c_unregister_device - reverse effect of i2c_new_device()
+ * @client: value returned from i2c_new_device()
+ */
+void i2c_unregister_device(struct i2c_client *client)
{
- struct i2c_adapter *adap = dev_to_i2c_adapter(dev);
- complete(&adap->dev_released);
+ struct i2c_adapter *adapter = client->adapter;
+ struct i2c_driver *driver = client->driver;
+
+ if (driver && !is_newstyle_driver(driver)) {
+ dev_err(&client->dev, "can't unregister devices "
+ "with legacy drivers\n");
+ WARN_ON(1);
+ return;
+ }
+
+ mutex_lock(&adapter->clist_lock);
+ list_del(&client->list);
+ mutex_unlock(&adapter->clist_lock);
+
+ device_unregister(&client->dev);
}
+EXPORT_SYMBOL_GPL(i2c_unregister_device);
-struct device_driver i2c_adapter_driver = {
- .owner = THIS_MODULE,
- .name = "i2c_adapter",
- .bus = &i2c_bus_type,
-};
/* ------------------------------------------------------------------------- */
/* I2C bus adapters -- one roots each I2C or SMBUS segment */
-static void i2c_adapter_class_dev_release(struct class_device *dev)
+void i2c_adapter_dev_release(struct device *dev)
{
- struct i2c_adapter *adap = class_dev_to_i2c_adapter(dev);
- complete(&adap->class_dev_released);
+ struct i2c_adapter *adap = to_i2c_adapter(dev);
+ complete(&adap->dev_released);
}
+EXPORT_SYMBOL_GPL(i2c_adapter_dev_release); /* exported to i2c-isa */
-static ssize_t i2c_adapter_show_name(struct class_device *cdev, char *buf)
+static ssize_t
+show_adapter_name(struct device *dev, struct device_attribute *attr, char *buf)
{
- struct i2c_adapter *adap = class_dev_to_i2c_adapter(cdev);
+ struct i2c_adapter *adap = to_i2c_adapter(dev);
return sprintf(buf, "%s\n", adap->name);
}
-static struct class_device_attribute i2c_adapter_attrs[] = {
- __ATTR(name, S_IRUGO, i2c_adapter_show_name, NULL),
+static struct device_attribute i2c_adapter_attrs[] = {
+ __ATTR(name, S_IRUGO, show_adapter_name, NULL),
{ },
};
struct class i2c_adapter_class = {
.owner = THIS_MODULE,
.name = "i2c-adapter",
- .class_dev_attrs = i2c_adapter_attrs,
- .release = &i2c_adapter_class_dev_release,
+ .dev_attrs = i2c_adapter_attrs,
};
+EXPORT_SYMBOL_GPL(i2c_adapter_class); /* exported to i2c-isa */
-static ssize_t show_adapter_name(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct i2c_adapter *adap = dev_to_i2c_adapter(dev);
- return sprintf(buf, "%s\n", adap->name);
-}
-static DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL);
-
-
-static void i2c_client_release(struct device *dev)
-{
- struct i2c_client *client = to_i2c_client(dev);
- complete(&client->released);
-}
-
-static ssize_t show_client_name(struct device *dev, struct device_attribute *attr, char *buf)
+static void i2c_scan_static_board_info(struct i2c_adapter *adapter)
{
- struct i2c_client *client = to_i2c_client(dev);
- return sprintf(buf, "%s\n", client->name);
+ struct i2c_devinfo *devinfo;
+
+ mutex_lock(&__i2c_board_lock);
+ list_for_each_entry(devinfo, &__i2c_board_list, list) {
+ if (devinfo->busnum == adapter->nr
+ && !i2c_new_device(adapter,
+ &devinfo->board_info))
+ printk(KERN_ERR "i2c-core: can't create i2c%d-%04x\n",
+ i2c_adapter_id(adapter),
+ devinfo->board_info.addr);
+ }
+ mutex_unlock(&__i2c_board_lock);
}
-/*
- * We can't use the DEVICE_ATTR() macro here, as we used the same name for
- * an i2c adapter attribute (above).
- */
-static struct device_attribute dev_attr_client_name =
- __ATTR(name, S_IRUGO, &show_client_name, NULL);
-
-
-/* ---------------------------------------------------
- * registering functions
- * ---------------------------------------------------
- */
-
-/* -----
- * i2c_add_adapter is called from within the algorithm layer,
- * when a new hw adapter registers. A new device is register to be
- * available for clients.
- */
-int i2c_add_adapter(struct i2c_adapter *adap)
+static int i2c_register_adapter(struct i2c_adapter *adap)
{
- int id, res = 0;
+ int res = 0;
struct list_head *item;
struct i2c_driver *driver;
- mutex_lock(&core_lists);
-
- if (idr_pre_get(&i2c_adapter_idr, GFP_KERNEL) == 0) {
- res = -ENOMEM;
- goto out_unlock;
- }
-
- res = idr_get_new(&i2c_adapter_idr, adap, &id);
- if (res < 0) {
- if (res == -EAGAIN)
- res = -ENOMEM;
- goto out_unlock;
- }
-
- adap->nr = id & MAX_ID_MASK;
mutex_init(&adap->bus_lock);
mutex_init(&adap->clist_lock);
- list_add_tail(&adap->list,&adapters);
INIT_LIST_HEAD(&adap->clients);
+ mutex_lock(&core_lists);
+ list_add_tail(&adap->list, &adapters);
+
/* Add the adapter to the driver core.
* If the parent pointer is not set up,
* we add this adapter to the host bus.
"physical device\n", adap->name);
}
sprintf(adap->dev.bus_id, "i2c-%d", adap->nr);
- adap->dev.driver = &i2c_adapter_driver;
adap->dev.release = &i2c_adapter_dev_release;
+ adap->dev.class = &i2c_adapter_class;
res = device_register(&adap->dev);
if (res)
goto out_list;
- res = device_create_file(&adap->dev, &dev_attr_name);
- if (res)
- goto out_unregister;
-
- /* Add this adapter to the i2c_adapter class */
- memset(&adap->class_dev, 0x00, sizeof(struct class_device));
- adap->class_dev.dev = &adap->dev;
- adap->class_dev.class = &i2c_adapter_class;
- strlcpy(adap->class_dev.class_id, adap->dev.bus_id, BUS_ID_SIZE);
- res = class_device_register(&adap->class_dev);
- if (res)
- goto out_remove_name;
dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
- /* inform drivers of new adapters */
+ /* create pre-declared device nodes for new-style drivers */
+ if (adap->nr < __i2c_first_dynamic_bus_num)
+ i2c_scan_static_board_info(adap);
+
+ /* let legacy drivers scan this bus for matching devices */
list_for_each(item,&drivers) {
driver = list_entry(item, struct i2c_driver, list);
if (driver->attach_adapter)
mutex_unlock(&core_lists);
return res;
-out_remove_name:
- device_remove_file(&adap->dev, &dev_attr_name);
-out_unregister:
- init_completion(&adap->dev_released); /* Needed? */
- device_unregister(&adap->dev);
- wait_for_completion(&adap->dev_released);
out_list:
list_del(&adap->list);
idr_remove(&i2c_adapter_idr, adap->nr);
goto out_unlock;
}
+/**
+ * i2c_add_adapter - declare i2c adapter, use dynamic bus number
+ * @adapter: the adapter to add
+ *
+ * This routine is used to declare an I2C adapter when its bus number
+ * doesn't matter. Examples: for I2C adapters dynamically added by
+ * USB links or PCI plugin cards.
+ *
+ * When this returns zero, a new bus number was allocated and stored
+ * in adap->nr, and the specified adapter became available for clients.
+ * Otherwise, a negative errno value is returned.
+ */
+int i2c_add_adapter(struct i2c_adapter *adapter)
+{
+ int id, res = 0;
+
+retry:
+ if (idr_pre_get(&i2c_adapter_idr, GFP_KERNEL) == 0)
+ return -ENOMEM;
+
+ mutex_lock(&core_lists);
+ /* "above" here means "above or equal to", sigh */
+ res = idr_get_new_above(&i2c_adapter_idr, adapter,
+ __i2c_first_dynamic_bus_num, &id);
+ mutex_unlock(&core_lists);
+
+ if (res < 0) {
+ if (res == -EAGAIN)
+ goto retry;
+ return res;
+ }
+
+ adapter->nr = id;
+ return i2c_register_adapter(adapter);
+}
+EXPORT_SYMBOL(i2c_add_adapter);
+
+/**
+ * i2c_add_numbered_adapter - declare i2c adapter, use static bus number
+ * @adap: the adapter to register (with adap->nr initialized)
+ *
+ * This routine is used to declare an I2C adapter when its bus number
+ * matters. Example: for I2C adapters from system-on-chip CPUs, or
+ * otherwise built in to the system's mainboard, and where i2c_board_info
+ * is used to properly configure I2C devices.
+ *
+ * If no devices have pre-been declared for this bus, then be sure to
+ * register the adapter before any dynamically allocated ones. Otherwise
+ * the required bus ID may not be available.
+ *
+ * When this returns zero, the specified adapter became available for
+ * clients using the bus number provided in adap->nr. Also, the table
+ * of I2C devices pre-declared using i2c_register_board_info() is scanned,
+ * and the appropriate driver model device nodes are created. Otherwise, a
+ * negative errno value is returned.
+ */
+int i2c_add_numbered_adapter(struct i2c_adapter *adap)
+{
+ int id;
+ int status;
+
+ if (adap->nr & ~MAX_ID_MASK)
+ return -EINVAL;
+
+retry:
+ if (idr_pre_get(&i2c_adapter_idr, GFP_KERNEL) == 0)
+ return -ENOMEM;
+
+ mutex_lock(&core_lists);
+ /* "above" here means "above or equal to", sigh;
+ * we need the "equal to" result to force the result
+ */
+ status = idr_get_new_above(&i2c_adapter_idr, adap, adap->nr, &id);
+ if (status == 0 && id != adap->nr) {
+ status = -EBUSY;
+ idr_remove(&i2c_adapter_idr, id);
+ }
+ mutex_unlock(&core_lists);
+ if (status == -EAGAIN)
+ goto retry;
+
+ if (status == 0)
+ status = i2c_register_adapter(adap);
+ return status;
+}
+EXPORT_SYMBOL_GPL(i2c_add_numbered_adapter);
int i2c_del_adapter(struct i2c_adapter *adap)
{
/* detach any active clients. This must be done first, because
* it can fail; in which case we give up. */
list_for_each_safe(item, _n, &adap->clients) {
+ struct i2c_driver *driver;
+
client = list_entry(item, struct i2c_client, list);
+ driver = client->driver;
+
+ /* new style, follow standard driver model */
+ if (!driver || is_newstyle_driver(driver)) {
+ i2c_unregister_device(client);
+ continue;
+ }
- if ((res=client->driver->detach_client(client))) {
+ /* legacy drivers create and remove clients themselves */
+ if ((res = driver->detach_client(client))) {
dev_err(&adap->dev, "detach_client failed for client "
"[%s] at address 0x%02x\n", client->name,
client->addr);
/* clean up the sysfs representation */
init_completion(&adap->dev_released);
- init_completion(&adap->class_dev_released);
- class_device_unregister(&adap->class_dev);
- device_remove_file(&adap->dev, &dev_attr_name);
device_unregister(&adap->dev);
list_del(&adap->list);
/* wait for sysfs to drop all references */
wait_for_completion(&adap->dev_released);
- wait_for_completion(&adap->class_dev_released);
- /* free dynamically allocated bus id */
+ /* free bus id */
idr_remove(&i2c_adapter_idr, adap->nr);
dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name);
mutex_unlock(&core_lists);
return res;
}
+EXPORT_SYMBOL(i2c_del_adapter);
+
+/* ------------------------------------------------------------------------- */
-/* -----
- * What follows is the "upwards" interface: commands for talking to clients,
- * which implement the functions to access the physical information of the
- * chips.
+/*
+ * An i2c_driver is used with one or more i2c_client (device) nodes to access
+ * i2c slave chips, on a bus instance associated with some i2c_adapter. There
+ * are two models for binding the driver to its device: "new style" drivers
+ * follow the standard Linux driver model and just respond to probe() calls
+ * issued if the driver core sees they match(); "legacy" drivers create device
+ * nodes themselves.
*/
int i2c_register_driver(struct module *owner, struct i2c_driver *driver)
{
- struct list_head *item;
- struct i2c_adapter *adapter;
int res;
+ /* new style driver methods can't mix with legacy ones */
+ if (is_newstyle_driver(driver)) {
+ if (driver->attach_adapter || driver->detach_adapter
+ || driver->detach_client) {
+ printk(KERN_WARNING
+ "i2c-core: driver [%s] is confused\n",
+ driver->driver.name);
+ return -EINVAL;
+ }
+ }
+
/* add the driver to the list of i2c drivers in the driver core */
driver->driver.owner = owner;
driver->driver.bus = &i2c_bus_type;
+ /* for new style drivers, when registration returns the driver core
+ * will have called probe() for all matching-but-unbound devices.
+ */
res = driver_register(&driver->driver);
if (res)
return res;
list_add_tail(&driver->list,&drivers);
pr_debug("i2c-core: driver [%s] registered\n", driver->driver.name);
- /* now look for instances of driver on our adapters */
+ /* legacy drivers scan i2c busses directly */
if (driver->attach_adapter) {
- list_for_each(item,&adapters) {
- adapter = list_entry(item, struct i2c_adapter, list);
+ struct i2c_adapter *adapter;
+
+ list_for_each_entry(adapter, &adapters, list) {
driver->attach_adapter(adapter);
}
}
}
EXPORT_SYMBOL(i2c_register_driver);
-int i2c_del_driver(struct i2c_driver *driver)
+/**
+ * i2c_del_driver - unregister I2C driver
+ * @driver: the driver being unregistered
+ */
+void i2c_del_driver(struct i2c_driver *driver)
{
struct list_head *item1, *item2, *_n;
struct i2c_client *client;
struct i2c_adapter *adap;
- int res = 0;
-
mutex_lock(&core_lists);
+ /* new-style driver? */
+ if (is_newstyle_driver(driver))
+ goto unregister;
+
/* Have a look at each adapter, if clients of this driver are still
* attached. If so, detach them to be able to kill the driver
* afterwards.
list_for_each(item1,&adapters) {
adap = list_entry(item1, struct i2c_adapter, list);
if (driver->detach_adapter) {
- if ((res = driver->detach_adapter(adap))) {
+ if (driver->detach_adapter(adap)) {
dev_err(&adap->dev, "detach_adapter failed "
"for driver [%s]\n",
driver->driver.name);
- goto out_unlock;
}
} else {
list_for_each_safe(item2, _n, &adap->clients) {
dev_dbg(&adap->dev, "detaching client [%s] "
"at 0x%02x\n", client->name,
client->addr);
- if ((res = driver->detach_client(client))) {
+ if (driver->detach_client(client)) {
dev_err(&adap->dev, "detach_client "
"failed for client [%s] at "
"0x%02x\n", client->name,
client->addr);
- goto out_unlock;
}
}
}
}
+ unregister:
driver_unregister(&driver->driver);
list_del(&driver->list);
pr_debug("i2c-core: driver [%s] unregistered\n", driver->driver.name);
- out_unlock:
mutex_unlock(&core_lists);
- return 0;
}
+EXPORT_SYMBOL(i2c_del_driver);
+
+/* ------------------------------------------------------------------------- */
static int __i2c_check_addr(struct i2c_adapter *adapter, unsigned int addr)
{
return rval;
}
+EXPORT_SYMBOL(i2c_check_addr);
int i2c_attach_client(struct i2c_client *client)
{
client->usage_count = 0;
client->dev.parent = &client->adapter->dev;
- client->dev.driver = &client->driver->driver;
client->dev.bus = &i2c_bus_type;
- client->dev.release = &i2c_client_release;
+
+ if (client->driver)
+ client->dev.driver = &client->driver->driver;
+
+ if (client->driver && !is_newstyle_driver(client->driver))
+ client->dev.release = i2c_client_release;
+ else
+ client->dev.release = i2c_client_dev_release;
snprintf(&client->dev.bus_id[0], sizeof(client->dev.bus_id),
"%d-%04x", i2c_adapter_id(adapter), client->addr);
res = device_register(&client->dev);
if (res)
goto out_list;
- res = device_create_file(&client->dev, &dev_attr_client_name);
- if (res)
- goto out_unregister;
mutex_unlock(&adapter->clist_lock);
if (adapter->client_register) {
return 0;
-out_unregister:
- init_completion(&client->released); /* Needed? */
- device_unregister(&client->dev);
- wait_for_completion(&client->released);
out_list:
list_del(&client->list);
dev_err(&adapter->dev, "Failed to attach i2c client %s at 0x%02x "
mutex_unlock(&adapter->clist_lock);
return res;
}
-
+EXPORT_SYMBOL(i2c_attach_client);
int i2c_detach_client(struct i2c_client *client)
{
mutex_lock(&adapter->clist_lock);
list_del(&client->list);
init_completion(&client->released);
- device_remove_file(&client->dev, &dev_attr_client_name);
device_unregister(&client->dev);
mutex_unlock(&adapter->clist_lock);
wait_for_completion(&client->released);
out:
return res;
}
+EXPORT_SYMBOL(i2c_detach_client);
static int i2c_inc_use_client(struct i2c_client *client)
{
return 0;
}
+EXPORT_SYMBOL(i2c_use_client);
int i2c_release_client(struct i2c_client *client)
{
return 0;
}
+EXPORT_SYMBOL(i2c_release_client);
void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg)
{
}
mutex_unlock(&adap->clist_lock);
}
+EXPORT_SYMBOL(i2c_clients_command);
static int __init i2c_init(void)
{
int retval;
retval = bus_register(&i2c_bus_type);
- if (retval)
- return retval;
- retval = driver_register(&i2c_adapter_driver);
if (retval)
return retval;
return class_register(&i2c_adapter_class);
static void __exit i2c_exit(void)
{
class_unregister(&i2c_adapter_class);
- driver_unregister(&i2c_adapter_driver);
bus_unregister(&i2c_bus_type);
}
#ifdef DEBUG
for (ret = 0; ret < num; ret++) {
dev_dbg(&adap->dev, "master_xfer[%d] %c, addr=0x%02x, "
- "len=%d\n", ret, msgs[ret].flags & I2C_M_RD ?
- 'R' : 'W', msgs[ret].addr, msgs[ret].len);
+ "len=%d%s\n", ret, (msgs[ret].flags & I2C_M_RD)
+ ? 'R' : 'W', msgs[ret].addr, msgs[ret].len,
+ (msgs[ret].flags & I2C_M_RECV_LEN) ? "+" : "");
}
#endif
return -ENOSYS;
}
}
+EXPORT_SYMBOL(i2c_transfer);
int i2c_master_send(struct i2c_client *client,const char *buf ,int count)
{
transmitted, else error code. */
return (ret == 1) ? count : ret;
}
+EXPORT_SYMBOL(i2c_master_send);
int i2c_master_recv(struct i2c_client *client, char *buf ,int count)
{
transmitted, else error code. */
return (ret == 1) ? count : ret;
}
-
+EXPORT_SYMBOL(i2c_master_recv);
int i2c_control(struct i2c_client *client,
unsigned int cmd, unsigned long arg)
}
return ret;
}
+EXPORT_SYMBOL(i2c_control);
/* ----------------------------------------------------
* the i2c address scanning function
return 0;
}
+EXPORT_SYMBOL(i2c_probe);
+
+struct i2c_client *
+i2c_new_probed_device(struct i2c_adapter *adap,
+ struct i2c_board_info *info,
+ unsigned short const *addr_list)
+{
+ int i;
+
+ /* Stop here if the bus doesn't support probing */
+ if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_READ_BYTE)) {
+ dev_err(&adap->dev, "Probing not supported\n");
+ return NULL;
+ }
+
+ mutex_lock(&adap->clist_lock);
+ for (i = 0; addr_list[i] != I2C_CLIENT_END; i++) {
+ /* Check address validity */
+ if (addr_list[i] < 0x03 || addr_list[i] > 0x77) {
+ dev_warn(&adap->dev, "Invalid 7-bit address "
+ "0x%02x\n", addr_list[i]);
+ continue;
+ }
+
+ /* Check address availability */
+ if (__i2c_check_addr(adap, addr_list[i])) {
+ dev_dbg(&adap->dev, "Address 0x%02x already in "
+ "use, not probing\n", addr_list[i]);
+ continue;
+ }
+
+ /* Test address responsiveness
+ The default probe method is a quick write, but it is known
+ to corrupt the 24RF08 EEPROMs due to a state machine bug,
+ and could also irreversibly write-protect some EEPROMs, so
+ for address ranges 0x30-0x37 and 0x50-0x5f, we use a byte
+ read instead. Also, some bus drivers don't implement
+ quick write, so we fallback to a byte read it that case
+ too. */
+ if ((addr_list[i] & ~0x07) == 0x30
+ || (addr_list[i] & ~0x0f) == 0x50
+ || !i2c_check_functionality(adap, I2C_FUNC_SMBUS_QUICK)) {
+ if (i2c_smbus_xfer(adap, addr_list[i], 0,
+ I2C_SMBUS_READ, 0,
+ I2C_SMBUS_BYTE, NULL) >= 0)
+ break;
+ } else {
+ if (i2c_smbus_xfer(adap, addr_list[i], 0,
+ I2C_SMBUS_WRITE, 0,
+ I2C_SMBUS_QUICK, NULL) >= 0)
+ break;
+ }
+ }
+ mutex_unlock(&adap->clist_lock);
+
+ if (addr_list[i] == I2C_CLIENT_END) {
+ dev_dbg(&adap->dev, "Probing failed, no device found\n");
+ return NULL;
+ }
+
+ info->addr = addr_list[i];
+ return i2c_new_device(adap, info);
+}
+EXPORT_SYMBOL_GPL(i2c_new_probed_device);
struct i2c_adapter* i2c_get_adapter(int id)
{
mutex_unlock(&core_lists);
return adapter;
}
+EXPORT_SYMBOL(i2c_get_adapter);
void i2c_put_adapter(struct i2c_adapter *adap)
{
module_put(adap->owner);
}
+EXPORT_SYMBOL(i2c_put_adapter);
/* The SMBus parts */
return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
value,0,I2C_SMBUS_QUICK,NULL);
}
+EXPORT_SYMBOL(i2c_smbus_write_quick);
s32 i2c_smbus_read_byte(struct i2c_client *client)
{
else
return data.byte;
}
+EXPORT_SYMBOL(i2c_smbus_read_byte);
s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value)
{
return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
}
+EXPORT_SYMBOL(i2c_smbus_write_byte);
s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command)
{
else
return data.byte;
}
+EXPORT_SYMBOL(i2c_smbus_read_byte_data);
s32 i2c_smbus_write_byte_data(struct i2c_client *client, u8 command, u8 value)
{
I2C_SMBUS_WRITE,command,
I2C_SMBUS_BYTE_DATA,&data);
}
+EXPORT_SYMBOL(i2c_smbus_write_byte_data);
s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command)
{
else
return data.word;
}
+EXPORT_SYMBOL(i2c_smbus_read_word_data);
s32 i2c_smbus_write_word_data(struct i2c_client *client, u8 command, u16 value)
{
I2C_SMBUS_WRITE,command,
I2C_SMBUS_WORD_DATA,&data);
}
+EXPORT_SYMBOL(i2c_smbus_write_word_data);
+
+/* Returns the number of read bytes */
+s32 i2c_smbus_read_block_data(struct i2c_client *client, u8 command,
+ u8 *values)
+{
+ union i2c_smbus_data data;
+
+ if (i2c_smbus_xfer(client->adapter, client->addr, client->flags,
+ I2C_SMBUS_READ, command,
+ I2C_SMBUS_BLOCK_DATA, &data))
+ return -1;
+
+ memcpy(values, &data.block[1], data.block[0]);
+ return data.block[0];
+}
+EXPORT_SYMBOL(i2c_smbus_read_block_data);
s32 i2c_smbus_write_block_data(struct i2c_client *client, u8 command,
u8 length, const u8 *values)
I2C_SMBUS_WRITE,command,
I2C_SMBUS_BLOCK_DATA,&data);
}
+EXPORT_SYMBOL(i2c_smbus_write_block_data);
/* Returns the number of read bytes */
s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client, u8 command, u8 *values)
memcpy(values, &data.block[1], data.block[0]);
return data.block[0];
}
+EXPORT_SYMBOL(i2c_smbus_read_i2c_block_data);
s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client, u8 command,
u8 length, const u8 *values)
I2C_SMBUS_WRITE, command,
I2C_SMBUS_I2C_BLOCK_DATA, &data);
}
+EXPORT_SYMBOL(i2c_smbus_write_i2c_block_data);
/* Simulate a SMBus command using the i2c protocol
No checking of parameters is done! */
break;
case I2C_SMBUS_BLOCK_DATA:
if (read_write == I2C_SMBUS_READ) {
- dev_err(&adapter->dev, "Block read not supported "
- "under I2C emulation!\n");
- return -1;
+ msg[1].flags |= I2C_M_RECV_LEN;
+ msg[1].len = 1; /* block length will be added by
+ the underlying bus driver */
} else {
msg[0].len = data->block[0] + 2;
if (msg[0].len > I2C_SMBUS_BLOCK_MAX + 2) {
}
break;
case I2C_SMBUS_BLOCK_PROC_CALL:
- dev_dbg(&adapter->dev, "Block process call not supported "
- "under I2C emulation!\n");
- return -1;
+ num = 2; /* Another special case */
+ read_write = I2C_SMBUS_READ;
+ if (data->block[0] > I2C_SMBUS_BLOCK_MAX) {
+ dev_err(&adapter->dev, "%s called with invalid "
+ "block proc call size (%d)\n", __FUNCTION__,
+ data->block[0]);
+ return -1;
+ }
+ msg[0].len = data->block[0] + 2;
+ for (i = 1; i < msg[0].len; i++)
+ msgbuf0[i] = data->block[i-1];
+ msg[1].flags |= I2C_M_RECV_LEN;
+ msg[1].len = 1; /* block length will be added by
+ the underlying bus driver */
+ break;
case I2C_SMBUS_I2C_BLOCK_DATA:
if (read_write == I2C_SMBUS_READ) {
msg[1].len = I2C_SMBUS_BLOCK_MAX;
for (i = 0; i < I2C_SMBUS_BLOCK_MAX; i++)
data->block[i+1] = msgbuf1[i];
break;
+ case I2C_SMBUS_BLOCK_DATA:
+ case I2C_SMBUS_BLOCK_PROC_CALL:
+ for (i = 0; i < msgbuf1[0] + 1; i++)
+ data->block[i] = msgbuf1[i];
+ break;
}
return 0;
}
return res;
}
-
-
-/* Next four are needed by i2c-isa */
-EXPORT_SYMBOL_GPL(i2c_adapter_dev_release);
-EXPORT_SYMBOL_GPL(i2c_adapter_driver);
-EXPORT_SYMBOL_GPL(i2c_adapter_class);
-EXPORT_SYMBOL_GPL(i2c_bus_type);
-
-EXPORT_SYMBOL(i2c_add_adapter);
-EXPORT_SYMBOL(i2c_del_adapter);
-EXPORT_SYMBOL(i2c_del_driver);
-EXPORT_SYMBOL(i2c_attach_client);
-EXPORT_SYMBOL(i2c_detach_client);
-EXPORT_SYMBOL(i2c_use_client);
-EXPORT_SYMBOL(i2c_release_client);
-EXPORT_SYMBOL(i2c_clients_command);
-EXPORT_SYMBOL(i2c_check_addr);
-
-EXPORT_SYMBOL(i2c_master_send);
-EXPORT_SYMBOL(i2c_master_recv);
-EXPORT_SYMBOL(i2c_control);
-EXPORT_SYMBOL(i2c_transfer);
-EXPORT_SYMBOL(i2c_get_adapter);
-EXPORT_SYMBOL(i2c_put_adapter);
-EXPORT_SYMBOL(i2c_probe);
-
EXPORT_SYMBOL(i2c_smbus_xfer);
-EXPORT_SYMBOL(i2c_smbus_write_quick);
-EXPORT_SYMBOL(i2c_smbus_read_byte);
-EXPORT_SYMBOL(i2c_smbus_write_byte);
-EXPORT_SYMBOL(i2c_smbus_read_byte_data);
-EXPORT_SYMBOL(i2c_smbus_write_byte_data);
-EXPORT_SYMBOL(i2c_smbus_read_word_data);
-EXPORT_SYMBOL(i2c_smbus_write_word_data);
-EXPORT_SYMBOL(i2c_smbus_write_block_data);
-EXPORT_SYMBOL(i2c_smbus_read_i2c_block_data);
-EXPORT_SYMBOL(i2c_smbus_write_i2c_block_data);
MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>");
MODULE_DESCRIPTION("I2C-Bus main module");
--- /dev/null
+/*
+ * i2c-core.h - interfaces internal to the I2C framework
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+struct i2c_devinfo {
+ struct list_head list;
+ int busnum;
+ struct i2c_board_info board_info;
+};
+
+/* board_lock protects board_list and first_dynamic_bus_num.
+ * only i2c core components are allowed to use these symbols.
+ */
+extern struct mutex __i2c_board_lock;
+extern struct list_head __i2c_board_list;
+extern int __i2c_first_dynamic_bus_num;
+
static int
therm_of_remove( struct of_device *dev )
{
- return i2c_del_driver( &g4fan_driver );
+ i2c_del_driver( &g4fan_driver );
+ return 0;
}
static struct of_device_id therm_of_match[] = {{
mutex_init(&fc->i2c_mutex);
memset(&fc->i2c_adap, 0, sizeof(struct i2c_adapter));
- strncpy(fc->i2c_adap.name, "B2C2 FlexCop device",I2C_NAME_SIZE);
+ strncpy(fc->i2c_adap.name, "B2C2 FlexCop device",
+ sizeof(fc->i2c_adap.name));
i2c_set_adapdata(&fc->i2c_adap,fc);
return -EINVAL;
}
- strncpy(d->i2c_adap.name,d->desc->name,I2C_NAME_SIZE);
+ strncpy(d->i2c_adap.name, d->desc->name, sizeof(d->i2c_adap.name));
#ifdef I2C_ADAP_CLASS_TV_DIGITAL
d->i2c_adap.class = I2C_ADAP_CLASS_TV_DIGITAL,
#else
}
EXPORT_SYMBOL(dibx000_get_i2c_adapter);
-static int i2c_adapter_init(struct i2c_adapter *i2c_adap, struct i2c_algorithm *algo, const char name[I2C_NAME_SIZE], struct dibx000_i2c_master *mst)
+static int i2c_adapter_init(struct i2c_adapter *i2c_adap, struct i2c_algorithm *algo, const char *name, struct dibx000_i2c_master *mst)
{
- strncpy(i2c_adap->name, name, I2C_NAME_SIZE);
+ strncpy(i2c_adap->name, name, sizeof(i2c_adap->name));
i2c_adap->class = I2C_CLASS_TV_DIGITAL,
i2c_adap->algo = algo;
i2c_adap->algo_data = NULL;
#include <linux/init.h>
#include <linux/types.h>
#include <linux/videodev2.h>
-#include <linux/i2c.h>
#include <media/tuner.h>
#include <media/cx2341x.h>
#ifndef __LINUX_OVCAMCHIP_PRIV_H
#define __LINUX_OVCAMCHIP_PRIV_H
+#include <linux/i2c.h>
#include <media/ovcamchip.h>
#ifdef DEBUG
#include <linux/list.h>
-#include <linux/i2c.h>
#include <media/v4l2-dev.h>
#include <media/tuner.h>
#include "usbvision.h"
chan->dinfo = dinfo;
chan->reg = reg;
- snprintf(chan->adapter.name, I2C_NAME_SIZE, "intelfb %s", name);
+ snprintf(chan->adapter.name, sizeof(chan->adapter.name),
+ "intelfb %s", name);
chan->adapter.owner = THIS_MODULE;
chan->adapter.id = I2C_HW_B_INTELFB;
chan->adapter.algo_data = &chan->algo;
b->mask.data = data;
b->mask.clock = clock;
b->adapter = matrox_i2c_adapter_template;
- snprintf(b->adapter.name, I2C_NAME_SIZE, name,
+ snprintf(b->adapter.name, sizeof(b->adapter.name), name,
minfo->fbcon.node);
i2c_set_adapdata(&b->adapter, b);
b->adapter.algo_data = &b->bac;
int (*getscl) (void *data);
/* local settings */
- int udelay; /* half-clock-cycle time in microsecs */
- /* i.e. clock is (500 / udelay) KHz */
+ int udelay; /* half clock cycle time in us,
+ minimum 2 us for fast-mode I2C,
+ minimum 5 us for standard-mode I2C and SMBus,
+ maximum 50 us for SMBus */
int timeout; /* in jiffies */
};
int i2c_bit_add_bus(struct i2c_adapter *);
+int i2c_bit_add_numbered_bus(struct i2c_adapter *);
#endif /* _LINUX_I2C_ALGO_BIT_H */
--- /dev/null
+/*
+ * i2c-gpio interface to platform code
+ *
+ * Copyright (C) 2007 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef _LINUX_I2C_GPIO_H
+#define _LINUX_I2C_GPIO_H
+
+/**
+ * struct i2c_gpio_platform_data - Platform-dependent data for i2c-gpio
+ * @sda_pin: GPIO pin ID to use for SDA
+ * @scl_pin: GPIO pin ID to use for SCL
+ * @udelay: signal toggle delay. SCL frequency is (500 / udelay) kHz
+ * @timeout: clock stretching timeout in jiffies. If the slave keeps
+ * SCL low for longer than this, the transfer will time out.
+ * @sda_is_open_drain: SDA is configured as open drain, i.e. the pin
+ * isn't actively driven high when setting the output value high.
+ * gpio_get_value() must return the actual pin state even if the
+ * pin is configured as an output.
+ * @scl_is_open_drain: SCL is set up as open drain. Same requirements
+ * as for sda_is_open_drain apply.
+ * @scl_is_output_only: SCL output drivers cannot be turned off.
+ */
+struct i2c_gpio_platform_data {
+ unsigned int sda_pin;
+ unsigned int scl_pin;
+ int udelay;
+ int timeout;
+ unsigned int sda_is_open_drain:1;
+ unsigned int scl_is_open_drain:1;
+ unsigned int scl_is_output_only:1;
+};
+
+#endif /* _LINUX_I2C_GPIO_H */
/* --- MCP107 adapter */
#define I2C_HW_MPC107 0x0d0000
-/* --- Marvell mv64xxx i2c adapter */
+/* --- Embedded adapters */
#define I2C_HW_MV64XXX 0x190000
+#define I2C_HW_BLACKFIN 0x190001 /* ADI Blackfin I2C TWI driver */
/* --- Miscellaneous adapters */
#define I2C_HW_SAA7146 0x060000 /* SAA7146 video decoder bus */
#include <linux/sched.h> /* for completion */
#include <linux/mutex.h>
-/* --- For i2c-isa ---------------------------------------------------- */
-
-extern void i2c_adapter_dev_release(struct device *dev);
-extern struct device_driver i2c_adapter_driver;
-extern struct class i2c_adapter_class;
extern struct bus_type i2c_bus_type;
/* --- General options ------------------------------------------------ */
extern s32 i2c_smbus_read_word_data(struct i2c_client * client, u8 command);
extern s32 i2c_smbus_write_word_data(struct i2c_client * client,
u8 command, u16 value);
+/* Returns the number of read bytes */
+extern s32 i2c_smbus_read_block_data(struct i2c_client *client,
+ u8 command, u8 *values);
extern s32 i2c_smbus_write_block_data(struct i2c_client * client,
u8 command, u8 length,
const u8 *values);
* can be used by the driver to test if the bus meets its conditions
* & seek for the presence of the chip(s) it supports. If found, it
* registers the client(s) that are on the bus to the i2c admin. via
- * i2c_attach_client.
+ * i2c_attach_client. (LEGACY I2C DRIVERS ONLY)
*/
int (*attach_adapter)(struct i2c_adapter *);
int (*detach_adapter)(struct i2c_adapter *);
/* tells the driver that a client is about to be deleted & gives it
* the chance to remove its private data. Also, if the client struct
* has been dynamically allocated by the driver in the function above,
- * it must be freed here.
+ * it must be freed here. (LEGACY I2C DRIVERS ONLY)
*/
int (*detach_client)(struct i2c_client *);
+ /* Standard driver model interfaces, for "new style" i2c drivers.
+ * With the driver model, device enumeration is NEVER done by drivers;
+ * it's done by infrastructure. (NEW STYLE DRIVERS ONLY)
+ */
+ int (*probe)(struct i2c_client *);
+ int (*remove)(struct i2c_client *);
+
/* driver model interfaces that don't relate to enumeration */
void (*shutdown)(struct i2c_client *);
int (*suspend)(struct i2c_client *, pm_message_t mesg);
};
#define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
-#define I2C_NAME_SIZE 50
+#define I2C_NAME_SIZE 20
-/*
- * i2c_client identifies a single device (i.e. chip) that is connected to an
- * i2c bus. The behaviour is defined by the routines of the driver. This
- * function is mainly used for lookup & other admin. functions.
+/**
+ * struct i2c_client - represent an I2C slave device
+ * @addr: Address used on the I2C bus connected to the parent adapter.
+ * @name: Indicates the type of the device, usually a chip name that's
+ * generic enough to hide second-sourcing and compatible revisions.
+ * @dev: Driver model device node for the slave.
+ * @driver_name: Identifies new-style driver used with this device; also
+ * used as the module name for hotplug/coldplug modprobe support.
+ *
+ * An i2c_client identifies a single device (i.e. chip) connected to an
+ * i2c bus. The behaviour is defined by the routines of the driver.
*/
struct i2c_client {
- unsigned int flags; /* div., see below */
+ unsigned short flags; /* div., see below */
unsigned short addr; /* chip address - NOTE: 7bit */
/* addresses are stored in the */
/* _LOWER_ 7 bits */
+ char name[I2C_NAME_SIZE];
struct i2c_adapter *adapter; /* the adapter we sit on */
struct i2c_driver *driver; /* and our access routines */
int usage_count; /* How many accesses currently */
/* to the client */
struct device dev; /* the device structure */
+ int irq; /* irq issued by device (or -1) */
+ char driver_name[KOBJ_NAME_LEN];
struct list_head list;
- char name[I2C_NAME_SIZE];
struct completion released;
};
#define to_i2c_client(d) container_of(d, struct i2c_client, dev)
dev_set_drvdata (&dev->dev, data);
}
+/**
+ * struct i2c_board_info - template for device creation
+ * @driver_name: identifies the driver to be bound to the device
+ * @type: optional chip type information, to initialize i2c_client.name
+ * @flags: to initialize i2c_client.flags
+ * @addr: stored in i2c_client.addr
+ * @platform_data: stored in i2c_client.dev.platform_data
+ * @irq: stored in i2c_client.irq
+
+ * I2C doesn't actually support hardware probing, although controllers and
+ * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
+ * a device at a given address. Drivers commonly need more information than
+ * that, such as chip type, configuration, associated IRQ, and so on.
+ *
+ * i2c_board_info is used to build tables of information listing I2C devices
+ * that are present. This information is used to grow the driver model tree
+ * for "new style" I2C drivers. For mainboards this is done statically using
+ * i2c_register_board_info(), where @bus_num represents an adapter that isn't
+ * yet available. For add-on boards, i2c_new_device() does this dynamically
+ * with the adapter already known.
+ */
+struct i2c_board_info {
+ char driver_name[KOBJ_NAME_LEN];
+ char type[I2C_NAME_SIZE];
+ unsigned short flags;
+ unsigned short addr;
+ void *platform_data;
+ int irq;
+};
+
+/**
+ * I2C_BOARD_INFO - macro used to list an i2c device and its driver
+ * @driver: identifies the driver to use with the device
+ * @dev_addr: the device's address on the bus.
+ *
+ * This macro initializes essential fields of a struct i2c_board_info,
+ * declaring what has been provided on a particular board. Optional
+ * fields (such as the chip type, its associated irq, or device-specific
+ * platform_data) are provided using conventional syntax.
+ */
+#define I2C_BOARD_INFO(driver,dev_addr) \
+ .driver_name = (driver), .addr = (dev_addr)
+
+
+/* Add-on boards should register/unregister their devices; e.g. a board
+ * with integrated I2C, a config eeprom, sensors, and a codec that's
+ * used in conjunction with the primary hardware.
+ */
+extern struct i2c_client *
+i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
+
+/* If you don't know the exact address of an I2C device, use this variant
+ * instead, which can probe for device presence in a list of possible
+ * addresses.
+ */
+extern struct i2c_client *
+i2c_new_probed_device(struct i2c_adapter *adap,
+ struct i2c_board_info *info,
+ unsigned short const *addr_list);
+
+extern void i2c_unregister_device(struct i2c_client *);
+
+/* Mainboard arch_initcall() code should register all its I2C devices.
+ * This is done at arch_initcall time, before declaring any i2c adapters.
+ * Modules for add-on boards must use other calls.
+ */
+extern int
+i2c_register_board_info(int busnum, struct i2c_board_info const *info, unsigned n);
+
+
/*
* The following structs are for those who like to implement new bus drivers:
* i2c_algorithm is the interface to a class of hardware solutions which can
int timeout;
int retries;
struct device dev; /* the adapter device */
- struct class_device class_dev; /* the class device */
int nr;
struct list_head clients;
struct list_head list;
- char name[I2C_NAME_SIZE];
+ char name[48];
struct completion dev_released;
- struct completion class_dev_released;
};
-#define dev_to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
-#define class_dev_to_i2c_adapter(d) container_of(d, struct i2c_adapter, class_dev)
+#define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
static inline void *i2c_get_adapdata (struct i2c_adapter *dev)
{
*/
extern int i2c_add_adapter(struct i2c_adapter *);
extern int i2c_del_adapter(struct i2c_adapter *);
+extern int i2c_add_numbered_adapter(struct i2c_adapter *);
extern int i2c_register_driver(struct module *, struct i2c_driver *);
-extern int i2c_del_driver(struct i2c_driver *);
+extern void i2c_del_driver(struct i2c_driver *);
static inline int i2c_add_driver(struct i2c_driver *driver)
{
#define I2C_M_REV_DIR_ADDR 0x2000
#define I2C_M_IGNORE_NAK 0x1000
#define I2C_M_NO_RD_ACK 0x0800
+#define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */
__u16 len; /* msg length */
__u8 *buf; /* pointer to msg data */
};
#define PCI_DEVICE_ID_NVIDIA_NVENET_16 0x03E5
#define PCI_DEVICE_ID_NVIDIA_NVENET_17 0x03E6
#define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA 0x03E7
+#define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SMBUS 0x03EB
#define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_IDE 0x03EC
#define PCI_DEVICE_ID_NVIDIA_NVENET_18 0x03EE
#define PCI_DEVICE_ID_NVIDIA_NVENET_19 0x03EF
#define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA2 0x03F6
#define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA3 0x03F7
+#define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_SMBUS 0x0446
#define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP65_IDE 0x0448
#define PCI_DEVICE_ID_NVIDIA_NVENET_20 0x0450
#define PCI_DEVICE_ID_NVIDIA_NVENET_21 0x0451
#include <linux/videodev.h>
#include <media/v4l2-common.h>
-#include <linux/i2c.h>
/* --------------------------------- */
/* ENUMERATIONS */
#define _TUNER_H
#include <linux/videodev2.h>
+#include <linux/i2c.h>
#include <media/tuner-types.h>
extern int tuner_debug;
#ifndef _TAS_IOCTL_H_
#define _TAS_IOCTL_H_
-#include <linux/i2c.h>
#include <linux/soundcard.h>
projects / linux-drm-fsl-dcu.git / commitdiff