ACPI: ibm-acpi: organize code
authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>
Fri, 23 Mar 2007 20:33:57 +0000 (17:33 -0300)
committerLen Brown <len.brown@intel.com>
Mon, 26 Mar 2007 03:37:54 +0000 (23:37 -0400)
Shuffle code around to better organize the driver code inside the
ibm-acpi.c file.

This patch adds no functional changes.  It is pure fluff that will make me
a bit more productive.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
drivers/acpi/ibm_acpi.c

index e2da95498f32ed96062371b1a49290c7efd425ec..984ec81bd234f047c56bf4001f3a3053bea57aeb 100644 (file)
@@ -87,8 +87,17 @@ MODULE_LICENSE("GPL");
 
 #define __unused __attribute__ ((unused))
 
-static int experimental;
-module_param(experimental, int, 0);
+/****************************************************************************
+ ****************************************************************************
+ *
+ * ACPI Helpers and device model
+ *
+ ****************************************************************************
+ ****************************************************************************/
+
+/*************************************************************************
+ * ACPI basic handles
+ */
 
 static acpi_handle root_handle = NULL;
 
@@ -105,183 +114,31 @@ IBM_HANDLE(ec, root, "\\_SB.PCI0.ISA.EC0",       /* 240, 240x */
           "\\_SB.PCI0.AD4S.EC0",       /* i1400, R30 */
           "\\_SB.PCI0.ICH3.EC0",       /* R31 */
           "\\_SB.PCI0.LPC.EC", /* all others */
-    );
+          );
 
-IBM_HANDLE(vid, root, "\\_SB.PCI.AGP.VGA",     /* 570 */
-          "\\_SB.PCI0.AGP0.VID0",      /* 600e/x, 770x */
-          "\\_SB.PCI0.VID0",   /* 770e */
-          "\\_SB.PCI0.VID",    /* A21e, G4x, R50e, X30, X40 */
-          "\\_SB.PCI0.AGP.VID",        /* all others */
-    );                         /* R30, R31 */
+IBM_HANDLE(ecrd, ec, "ECRD");  /* 570 */
+IBM_HANDLE(ecwr, ec, "ECWR");  /* 570 */
 
-IBM_HANDLE(vid2, root, "\\_SB.PCI0.AGPB.VID"); /* G41 */
+
+/*************************************************************************
+ * Misc ACPI handles
+ */
 
 IBM_HANDLE(cmos, root, "\\UCMS",       /* R50, R50e, R50p, R51, T4x, X31, X40 */
           "\\CMOS",            /* A3x, G4x, R32, T23, T30, X22-24, X30 */
           "\\CMS",             /* R40, R40e */
-    );                         /* all others */
-#ifdef CONFIG_ACPI_IBM_DOCK
-IBM_HANDLE(dock, root, "\\_SB.GDCK",   /* X30, X31, X40 */
-          "\\_SB.PCI0.DOCK",   /* 600e/x,770e,770x,A2xm/p,T20-22,X20-21 */
-          "\\_SB.PCI0.PCI1.DOCK",      /* all others */
-          "\\_SB.PCI.ISA.SLCE",        /* 570 */
-    );                         /* A21e,G4x,R30,R31,R32,R40,R40e,R50e */
-#endif
-#ifdef CONFIG_ACPI_IBM_BAY
-IBM_HANDLE(bay, root, "\\_SB.PCI.IDE.SECN.MAST",       /* 570 */
-          "\\_SB.PCI0.IDE0.IDES.IDSM", /* 600e/x, 770e, 770x */
-          "\\_SB.PCI0.SATA.SCND.MSTR", /* T60, X60, Z60 */
-          "\\_SB.PCI0.IDE0.SCND.MSTR", /* all others */
-    );                         /* A21e, R30, R31 */
-
-IBM_HANDLE(bay_ej, bay, "_EJ3",        /* 600e/x, A2xm/p, A3x */
-          "_EJ0",              /* all others */
-    );                         /* 570,A21e,G4x,R30,R31,R32,R40e,R50e */
-
-IBM_HANDLE(bay2, root, "\\_SB.PCI0.IDE0.PRIM.SLAV",    /* A3x, R32 */
-          "\\_SB.PCI0.IDE0.IDEP.IDPS", /* 600e/x, 770e, 770x */
-    );                         /* all others */
-
-IBM_HANDLE(bay2_ej, bay2, "_EJ3",      /* 600e/x, 770e, A3x */
-          "_EJ0",              /* 770x */
-    );                         /* all others */
-#endif /* CONFIG_ACPI_IBM_BAY */
-
-/* don't list other alternatives as we install a notify handler on the 570 */
-IBM_HANDLE(pci, root, "\\_SB.PCI");    /* 570 */
+          );                   /* all others */
 
 IBM_HANDLE(hkey, ec, "\\_SB.HKEY",     /* 600e/x, 770e, 770x */
           "^HKEY",             /* R30, R31 */
           "HKEY",              /* all others */
-    );                         /* 570 */
+          );                   /* 570 */
 
-IBM_HANDLE(lght, root, "\\LGHT");      /* A21e, A2xm/p, T20-22, X20-21 */
-IBM_HANDLE(ledb, ec, "LEDB");  /* G4x */
 
-IBM_HANDLE(led, ec, "SLED",    /* 570 */
-          "SYSL",              /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20-21 */
-          "LED",               /* all others */
-    );                         /* R30, R31 */
-
-IBM_HANDLE(beep, ec, "BEEP");  /* all except R30, R31 */
-IBM_HANDLE(ecrd, ec, "ECRD");  /* 570 */
-IBM_HANDLE(ecwr, ec, "ECWR");  /* 570 */
-IBM_HANDLE(fans, ec, "FANS");  /* X31, X40, X41 */
-
-IBM_HANDLE(gfan, ec, "GFAN",   /* 570 */
-          "\\FSPD",            /* 600e/x, 770e, 770x */
-    );                         /* all others */
-
-IBM_HANDLE(sfan, ec, "SFAN",   /* 570 */
-          "JFNS",              /* 770x-JL */
-    );                         /* all others */
-
-/*
- * FAN ACCESS MODES
- *
- * IBMACPI_FAN_RD_ACPI_GFAN:
- *     ACPI GFAN method: returns fan level
- *
- *     see IBMACPI_FAN_WR_ACPI_SFAN
- *     EC 0x2f not available if GFAN exists
- *
- * IBMACPI_FAN_WR_ACPI_SFAN:
- *     ACPI SFAN method: sets fan level, 0 (stop) to 7 (max)
- *
- *     EC 0x2f might be available *for reading*, but never for writing.
- *
- * IBMACPI_FAN_WR_TPEC:
- *     ThinkPad EC register 0x2f (HFSP): fan control loop mode Supported
- *     on almost all ThinkPads
- *
- *     Fan speed changes of any sort (including those caused by the
- *     disengaged mode) are usually done slowly by the firmware as the
- *     maximum ammount of fan duty cycle change per second seems to be
- *     limited.
- *
- *     Reading is not available if GFAN exists.
- *     Writing is not available if SFAN exists.
- *
- *     Bits
- *      7      automatic mode engaged;
- *             (default operation mode of the ThinkPad)
- *             fan level is ignored in this mode.
- *      6      disengage mode (takes precedence over bit 7);
- *             not available on all thinkpads.  May disable
- *             the tachometer, and speeds up fan to 100% duty-cycle,
- *             which speeds it up far above the standard RPM
- *             levels.  It is not impossible that it could cause
- *             hardware damage.
- *     5-3     unused in some models.  Extra bits for fan level
- *             in others, but still useless as all values above
- *             7 map to the same speed as level 7 in these models.
- *     2-0     fan level (0..7 usually)
- *                     0x00 = stop
- *                     0x07 = max (set when temperatures critical)
- *             Some ThinkPads may have other levels, see
- *             IBMACPI_FAN_WR_ACPI_FANS (X31/X40/X41)
- *
- *     FIRMWARE BUG: on some models, EC 0x2f might not be initialized at
- *     boot. Apparently the EC does not intialize it, so unless ACPI DSDT
- *     does so, its initial value is meaningless (0x07).
- *
- *     For firmware bugs, refer to:
- *     http://thinkwiki.org/wiki/Embedded_Controller_Firmware#Firmware_Issues
- *
- *     ----
- *
- *     ThinkPad EC register 0x84 (LSB), 0x85 (MSB):
- *     Main fan tachometer reading (in RPM)
- *
- *     This register is present on all ThinkPads with a new-style EC, and
- *     it is known not to be present on the A21m/e, and T22, as there is
- *     something else in offset 0x84 according to the ACPI DSDT.  Other
- *     ThinkPads from this same time period (and earlier) probably lack the
- *     tachometer as well.
- *
- *     Unfortunately a lot of ThinkPads with new-style ECs but whose firwmare
- *     was never fixed by IBM to report the EC firmware version string
- *     probably support the tachometer (like the early X models), so
- *     detecting it is quite hard.  We need more data to know for sure.
- *
- *     FIRMWARE BUG: always read 0x84 first, otherwise incorrect readings
- *     might result.
- *
- *     FIRMWARE BUG: when EC 0x2f bit 6 is set (disengaged mode), this
- *     register is not invalidated in ThinkPads that disable tachometer
- *     readings.  Thus, the tachometer readings go stale.
- *
- *     For firmware bugs, refer to:
- *     http://thinkwiki.org/wiki/Embedded_Controller_Firmware#Firmware_Issues
- *
- * IBMACPI_FAN_WR_ACPI_FANS:
- *     ThinkPad X31, X40, X41.  Not available in the X60.
- *
- *     FANS ACPI handle: takes three arguments: low speed, medium speed,
- *     high speed.  ACPI DSDT seems to map these three speeds to levels
- *     as follows: STOP LOW LOW MED MED HIGH HIGH HIGH HIGH
- *     (this map is stored on FAN0..FAN8 as "0,1,1,2,2,3,3,3,3")
- *
- *     The speeds are stored on handles
- *     (FANA:FAN9), (FANC:FANB), (FANE:FAND).
- *
- *     There are three default speed sets, acessible as handles:
- *     FS1L,FS1M,FS1H; FS2L,FS2M,FS2H; FS3L,FS3M,FS3H
- *
- *     ACPI DSDT switches which set is in use depending on various
- *     factors.
- *
- *     IBMACPI_FAN_WR_TPEC is also available and should be used to
- *     command the fan.  The X31/X40/X41 seems to have 8 fan levels,
- *     but the ACPI tables just mention level 7.
+/*************************************************************************
+ * ACPI helpers
  */
 
-static char *ibm_thinkpad_ec_found = NULL;
-
-static struct proc_dir_entry *proc_dir = NULL;
-
-static struct backlight_device *ibm_backlight_device = NULL;
-
 static int acpi_evalf(acpi_handle handle,
                      void *res, char *method, char *fmt, ...)
 {
@@ -354,21 +211,218 @@ static int acpi_evalf(acpi_handle handle,
                return 0;
        }
 
-       if (!success && !quiet)
-               printk(IBM_ERR "acpi_evalf(%s, %s, ...) failed: %d\n",
-                      method, fmt0, status);
+       if (!success && !quiet)
+               printk(IBM_ERR "acpi_evalf(%s, %s, ...) failed: %d\n",
+                      method, fmt0, status);
+
+       return success;
+}
+
+static void __unused acpi_print_int(acpi_handle handle, char *method)
+{
+       int i;
+
+       if (acpi_evalf(handle, &i, method, "d"))
+               printk(IBM_INFO "%s = 0x%x\n", method, i);
+       else
+               printk(IBM_ERR "error calling %s\n", method);
+}
+
+static int acpi_ec_read(int i, u8 * p)
+{
+       int v;
+
+       if (ecrd_handle) {
+               if (!acpi_evalf(ecrd_handle, &v, NULL, "dd", i))
+                       return 0;
+               *p = v;
+       } else {
+               if (ec_read(i, p) < 0)
+                       return 0;
+       }
+
+       return 1;
+}
+
+static int acpi_ec_write(int i, u8 v)
+{
+       if (ecwr_handle) {
+               if (!acpi_evalf(ecwr_handle, NULL, NULL, "vdd", i, v))
+                       return 0;
+       } else {
+               if (ec_write(i, v) < 0)
+                       return 0;
+       }
+
+       return 1;
+}
+
+static int _sta(acpi_handle handle)
+{
+       int status;
+
+       if (!handle || !acpi_evalf(handle, &status, "_STA", "d"))
+               status = 0;
+
+       return status;
+}
+
+/*************************************************************************
+ * ACPI device model
+ */
+
+static void __init ibm_handle_init(char *name,
+                                  acpi_handle * handle, acpi_handle parent,
+                                  char **paths, int num_paths, char **path)
+{
+       int i;
+       acpi_status status;
+
+       for (i = 0; i < num_paths; i++) {
+               status = acpi_get_handle(parent, paths[i], handle);
+               if (ACPI_SUCCESS(status)) {
+                       *path = paths[i];
+                       return;
+               }
+       }
+
+       *handle = NULL;
+}
+
+static void dispatch_notify(acpi_handle handle, u32 event, void *data)
+{
+       struct ibm_struct *ibm = data;
+
+       if (!ibm || !ibm->notify)
+               return;
+
+       ibm->notify(ibm, event);
+}
+
+static int __init setup_notify(struct ibm_struct *ibm)
+{
+       acpi_status status;
+       int ret;
+
+       if (!*ibm->handle)
+               return 0;
+
+       ret = acpi_bus_get_device(*ibm->handle, &ibm->device);
+       if (ret < 0) {
+               printk(IBM_ERR "%s device not present\n", ibm->name);
+               return -ENODEV;
+       }
+
+       acpi_driver_data(ibm->device) = ibm;
+       sprintf(acpi_device_class(ibm->device), "%s/%s", IBM_NAME, ibm->name);
+
+       status = acpi_install_notify_handler(*ibm->handle, ibm->type,
+                                            dispatch_notify, ibm);
+       if (ACPI_FAILURE(status)) {
+               if (status == AE_ALREADY_EXISTS) {
+                       printk(IBM_NOTICE "another device driver is already handling %s events\n",
+                               ibm->name);
+               } else {
+                       printk(IBM_ERR "acpi_install_notify_handler(%s) failed: %d\n",
+                               ibm->name, status);
+               }
+               return -ENODEV;
+       }
+       ibm->notify_installed = 1;
+       return 0;
+}
+
+static int __init ibm_device_add(struct acpi_device *device)
+{
+       return 0;
+}
+
+static int __init register_ibmacpi_subdriver(struct ibm_struct *ibm)
+{
+       int ret;
+
+       ibm->driver = kzalloc(sizeof(struct acpi_driver), GFP_KERNEL);
+       if (!ibm->driver) {
+               printk(IBM_ERR "kmalloc(ibm->driver) failed\n");
+               return -1;
+       }
+
+       sprintf(ibm->driver->name, "%s_%s", IBM_NAME, ibm->name);
+       ibm->driver->ids = ibm->hid;
+       ibm->driver->ops.add = &ibm_device_add;
+
+       ret = acpi_bus_register_driver(ibm->driver);
+       if (ret < 0) {
+               printk(IBM_ERR "acpi_bus_register_driver(%s) failed: %d\n",
+                      ibm->hid, ret);
+               kfree(ibm->driver);
+       }
+
+       return ret;
+}
+
+
+/****************************************************************************
+ ****************************************************************************
+ *
+ * Procfs Helpers
+ *
+ ****************************************************************************
+ ****************************************************************************/
+
+static int dispatch_read(char *page, char **start, off_t off, int count,
+                        int *eof, void *data)
+{
+       struct ibm_struct *ibm = data;
+       int len;
+
+       if (!ibm || !ibm->read)
+               return -EINVAL;
+
+       len = ibm->read(page);
+       if (len < 0)
+               return len;
+
+       if (len <= off + count)
+               *eof = 1;
+       *start = page + off;
+       len -= off;
+       if (len > count)
+               len = count;
+       if (len < 0)
+               len = 0;
+
+       return len;
+}
+
+static int dispatch_write(struct file *file, const char __user * userbuf,
+                         unsigned long count, void *data)
+{
+       struct ibm_struct *ibm = data;
+       char *kernbuf;
+       int ret;
+
+       if (!ibm || !ibm->write)
+               return -EINVAL;
+
+       kernbuf = kmalloc(count + 2, GFP_KERNEL);
+       if (!kernbuf)
+               return -ENOMEM;
 
-       return success;
-}
+       if (copy_from_user(kernbuf, userbuf, count)) {
+               kfree(kernbuf);
+               return -EFAULT;
+       }
 
-static void __unused acpi_print_int(acpi_handle handle, char *method)
-{
-       int i;
+       kernbuf[count] = 0;
+       strcat(kernbuf, ",");
+       ret = ibm->write(kernbuf);
+       if (ret == 0)
+               ret = count;
 
-       if (acpi_evalf(handle, &i, method, "d"))
-               printk(IBM_INFO "%s = 0x%x\n", method, i);
-       else
-               printk(IBM_ERR "error calling %s\n", method);
+       kfree(kernbuf);
+
+       return ret;
 }
 
 static char *next_cmd(char **cmds)
@@ -387,6 +441,19 @@ static char *next_cmd(char **cmds)
        return start;
 }
 
+
+/****************************************************************************
+ ****************************************************************************
+ *
+ * Subdrivers
+ *
+ ****************************************************************************
+ ****************************************************************************/
+
+/*************************************************************************
+ * ibm-acpi init subdriver
+ */
+
 static int ibm_acpi_driver_init(void)
 {
        printk(IBM_INFO "%s v%s\n", IBM_DESC, IBM_VERSION);
@@ -409,11 +476,51 @@ static int ibm_acpi_driver_read(char *p)
        return len;
 }
 
+/*************************************************************************
+ * Hotkey subdriver
+ */
+
 static int hotkey_supported;
 static int hotkey_mask_supported;
 static int hotkey_orig_status;
 static int hotkey_orig_mask;
 
+static int hotkey_init(void)
+{
+       /* hotkey not supported on 570 */
+       hotkey_supported = hkey_handle != NULL;
+
+       if (hotkey_supported) {
+               /* mask not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
+                  A30, R30, R31, T20-22, X20-21, X22-24 */
+               hotkey_mask_supported =
+                   acpi_evalf(hkey_handle, NULL, "DHKN", "qv");
+
+               if (!hotkey_get(&hotkey_orig_status, &hotkey_orig_mask))
+                       return -ENODEV;
+       }
+
+       return 0;
+}
+
+static void hotkey_exit(void)
+{
+       if (hotkey_supported)
+               hotkey_set(hotkey_orig_status, hotkey_orig_mask);
+}
+
+static void hotkey_notify(struct ibm_struct *ibm, u32 event)
+{
+       int hkey;
+
+       if (acpi_evalf(hkey_handle, &hkey, "MHKP", "d"))
+               acpi_bus_generate_event(ibm->device, event, hkey);
+       else {
+               printk(IBM_ERR "unknown hotkey event %d\n", event);
+               acpi_bus_generate_event(ibm->device, event, 0);
+       }
+}
+
 static int hotkey_get(int *status, int *mask)
 {
        if (!acpi_evalf(hkey_handle, status, "DHKC", "d"))
@@ -444,24 +551,6 @@ static int hotkey_set(int status, int mask)
        return 1;
 }
 
-static int hotkey_init(void)
-{
-       /* hotkey not supported on 570 */
-       hotkey_supported = hkey_handle != NULL;
-
-       if (hotkey_supported) {
-               /* mask not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
-                  A30, R30, R31, T20-22, X20-21, X22-24 */
-               hotkey_mask_supported =
-                   acpi_evalf(hkey_handle, NULL, "DHKN", "qv");
-
-               if (!hotkey_get(&hotkey_orig_status, &hotkey_orig_mask))
-                       return -ENODEV;
-       }
-
-       return 0;
-}
-
 static int hotkey_read(char *p)
 {
        int status, mask;
@@ -523,23 +612,9 @@ static int hotkey_write(char *buf)
        return 0;
 }
 
-static void hotkey_exit(void)
-{
-       if (hotkey_supported)
-               hotkey_set(hotkey_orig_status, hotkey_orig_mask);
-}
-
-static void hotkey_notify(struct ibm_struct *ibm, u32 event)
-{
-       int hkey;
-
-       if (acpi_evalf(hkey_handle, &hkey, "MHKP", "d"))
-               acpi_bus_generate_event(ibm->device, event, hkey);
-       else {
-               printk(IBM_ERR "unknown hotkey event %d\n", event);
-               acpi_bus_generate_event(ibm->device, event, 0);
-       }
-}
+/*************************************************************************
+ * Bluetooth subdriver
+ */
 
 static int bluetooth_supported;
 
@@ -606,6 +681,10 @@ static int bluetooth_write(char *buf)
        return 0;
 }
 
+/*************************************************************************
+ * Wan subdriver
+ */
+
 static int wan_supported;
 
 static int wan_init(void)
@@ -668,9 +747,22 @@ static int wan_write(char *buf)
        return 0;
 }
 
+/*************************************************************************
+ * Video subdriver
+ */
+
 static enum video_access_mode video_supported;
 static int video_orig_autosw;
 
+IBM_HANDLE(vid, root, "\\_SB.PCI.AGP.VGA",     /* 570 */
+          "\\_SB.PCI0.AGP0.VID0",      /* 600e/x, 770x */
+          "\\_SB.PCI0.VID0",   /* 770e */
+          "\\_SB.PCI0.VID",    /* A21e, G4x, R50e, X30, X40 */
+          "\\_SB.PCI0.AGP.VID",        /* all others */
+          );                           /* R30, R31 */
+
+IBM_HANDLE(vid2, root, "\\_SB.PCI0.AGPB.VID"); /* G41 */
+
 static int video_init(void)
 {
        int ivga;
@@ -695,6 +787,11 @@ static int video_init(void)
        return 0;
 }
 
+static void video_exit(void)
+{
+       acpi_evalf(vid_handle, NULL, "_DOS", "vd", video_orig_autosw);
+}
+
 static int video_status(void)
 {
        int status = 0;
@@ -736,33 +833,6 @@ static int video_autosw(void)
        return autosw & 1;
 }
 
-static int video_read(char *p)
-{
-       int status = video_status();
-       int autosw = video_autosw();
-       int len = 0;
-
-       if (!video_supported) {
-               len += sprintf(p + len, "status:\t\tnot supported\n");
-               return len;
-       }
-
-       len += sprintf(p + len, "status:\t\tsupported\n");
-       len += sprintf(p + len, "lcd:\t\t%s\n", enabled(status, 0));
-       len += sprintf(p + len, "crt:\t\t%s\n", enabled(status, 1));
-       if (video_supported == IBMACPI_VIDEO_NEW)
-               len += sprintf(p + len, "dvi:\t\t%s\n", enabled(status, 3));
-       len += sprintf(p + len, "auto:\t\t%s\n", enabled(autosw, 0));
-       len += sprintf(p + len, "commands:\tlcd_enable, lcd_disable\n");
-       len += sprintf(p + len, "commands:\tcrt_enable, crt_disable\n");
-       if (video_supported == IBMACPI_VIDEO_NEW)
-               len += sprintf(p + len, "commands:\tdvi_enable, dvi_disable\n");
-       len += sprintf(p + len, "commands:\tauto_enable, auto_disable\n");
-       len += sprintf(p + len, "commands:\tvideo_switch, expand_toggle\n");
-
-       return len;
-}
-
 static int video_switch(void)
 {
        int autosw = video_autosw();
@@ -812,6 +882,33 @@ static int video_switch2(int status)
        return ret;
 }
 
+static int video_read(char *p)
+{
+       int status = video_status();
+       int autosw = video_autosw();
+       int len = 0;
+
+       if (!video_supported) {
+               len += sprintf(p + len, "status:\t\tnot supported\n");
+               return len;
+       }
+
+       len += sprintf(p + len, "status:\t\tsupported\n");
+       len += sprintf(p + len, "lcd:\t\t%s\n", enabled(status, 0));
+       len += sprintf(p + len, "crt:\t\t%s\n", enabled(status, 1));
+       if (video_supported == IBMACPI_VIDEO_NEW)
+               len += sprintf(p + len, "dvi:\t\t%s\n", enabled(status, 3));
+       len += sprintf(p + len, "auto:\t\t%s\n", enabled(autosw, 0));
+       len += sprintf(p + len, "commands:\tlcd_enable, lcd_disable\n");
+       len += sprintf(p + len, "commands:\tcrt_enable, crt_disable\n");
+       if (video_supported == IBMACPI_VIDEO_NEW)
+               len += sprintf(p + len, "commands:\tdvi_enable, dvi_disable\n");
+       len += sprintf(p + len, "commands:\tauto_enable, auto_disable\n");
+       len += sprintf(p + len, "commands:\tvideo_switch, expand_toggle\n");
+
+       return len;
+}
+
 static int video_write(char *buf)
 {
        char *cmd;
@@ -862,14 +959,16 @@ static int video_write(char *buf)
        return 0;
 }
 
-static void video_exit(void)
-{
-       acpi_evalf(vid_handle, NULL, "_DOS", "vd", video_orig_autosw);
-}
+/*************************************************************************
+ * Light (thinklight) subdriver
+ */
 
 static int light_supported;
 static int light_status_supported;
 
+IBM_HANDLE(lght, root, "\\LGHT");      /* A21e, A2xm/p, T20-22, X20-21 */
+IBM_HANDLE(ledb, ec, "LEDB");          /* G4x */
+
 static int light_init(void)
 {
        /* light not supported on 570, 600e/x, 770e, 770x, G4x, R30, R31 */
@@ -933,21 +1032,45 @@ static int light_write(char *buf)
        return 0;
 }
 
-#if defined(CONFIG_ACPI_IBM_DOCK) || defined(CONFIG_ACPI_IBM_BAY)
-static int _sta(acpi_handle handle)
-{
-       int status;
-
-       if (!handle || !acpi_evalf(handle, &status, "_STA", "d"))
-               status = 0;
+/*************************************************************************
+ * Dock subdriver
+ */
 
-       return status;
-}
-#endif
+/* don't list other alternatives as we install a notify handler on the 570 */
+IBM_HANDLE(pci, root, "\\_SB.PCI");    /* 570 */
 
 #ifdef CONFIG_ACPI_IBM_DOCK
+
+IBM_HANDLE(dock, root, "\\_SB.GDCK",   /* X30, X31, X40 */
+          "\\_SB.PCI0.DOCK",   /* 600e/x,770e,770x,A2xm/p,T20-22,X20-21 */
+          "\\_SB.PCI0.PCI1.DOCK",      /* all others */
+          "\\_SB.PCI.ISA.SLCE",        /* 570 */
+    );                         /* A21e,G4x,R30,R31,R32,R40,R40e,R50e */
+
 #define dock_docked() (_sta(dock_handle) & 1)
 
+static void dock_notify(struct ibm_struct *ibm, u32 event)
+{
+       int docked = dock_docked();
+       int pci = ibm->hid && strstr(ibm->hid, IBM_PCI_HID);
+
+       if (event == 1 && !pci) /* 570 */
+               acpi_bus_generate_event(ibm->device, event, 1); /* button */
+       else if (event == 1 && pci)     /* 570 */
+               acpi_bus_generate_event(ibm->device, event, 3); /* dock */
+       else if (event == 3 && docked)
+               acpi_bus_generate_event(ibm->device, event, 1); /* button */
+       else if (event == 3 && !docked)
+               acpi_bus_generate_event(ibm->device, event, 2); /* undock */
+       else if (event == 0 && docked)
+               acpi_bus_generate_event(ibm->device, event, 3); /* dock */
+       else {
+               printk(IBM_ERR "unknown dock event %d, status %d\n",
+                      event, _sta(dock_handle));
+               acpi_bus_generate_event(ibm->device, event, 0); /* unknown */
+       }
+}
+
 static int dock_read(char *p)
 {
        int len = 0;
@@ -976,39 +1099,22 @@ static int dock_write(char *buf)
                if (strlencmp(cmd, "undock") == 0) {
                        if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 0) ||
                            !acpi_evalf(dock_handle, NULL, "_EJ0", "vd", 1))
-                               return -EIO;
-               } else if (strlencmp(cmd, "dock") == 0) {
-                       if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 1))
-                               return -EIO;
-               } else
-                       return -EINVAL;
-       }
-
-       return 0;
-}
-
-static void dock_notify(struct ibm_struct *ibm, u32 event)
-{
-       int docked = dock_docked();
-       int pci = ibm->hid && strstr(ibm->hid, IBM_PCI_HID);
-
-       if (event == 1 && !pci) /* 570 */
-               acpi_bus_generate_event(ibm->device, event, 1); /* button */
-       else if (event == 1 && pci)     /* 570 */
-               acpi_bus_generate_event(ibm->device, event, 3); /* dock */
-       else if (event == 3 && docked)
-               acpi_bus_generate_event(ibm->device, event, 1); /* button */
-       else if (event == 3 && !docked)
-               acpi_bus_generate_event(ibm->device, event, 2); /* undock */
-       else if (event == 0 && docked)
-               acpi_bus_generate_event(ibm->device, event, 3); /* dock */
-       else {
-               printk(IBM_ERR "unknown dock event %d, status %d\n",
-                      event, _sta(dock_handle));
-               acpi_bus_generate_event(ibm->device, event, 0); /* unknown */
+                               return -EIO;
+               } else if (strlencmp(cmd, "dock") == 0) {
+                       if (!acpi_evalf(dock_handle, NULL, "_DCK", "vd", 1))
+                               return -EIO;
+               } else
+                       return -EINVAL;
        }
+
+       return 0;
 }
-#endif
+
+#endif /* CONFIG_ACPI_IBM_DOCK */
+
+/*************************************************************************
+ * Bay subdriver
+ */
 
 #ifdef CONFIG_ACPI_IBM_BAY
 static int bay_status_supported;
@@ -1016,6 +1122,21 @@ static int bay_status2_supported;
 static int bay_eject_supported;
 static int bay_eject2_supported;
 
+IBM_HANDLE(bay, root, "\\_SB.PCI.IDE.SECN.MAST",       /* 570 */
+          "\\_SB.PCI0.IDE0.IDES.IDSM", /* 600e/x, 770e, 770x */
+          "\\_SB.PCI0.SATA.SCND.MSTR", /* T60, X60, Z60 */
+          "\\_SB.PCI0.IDE0.SCND.MSTR", /* all others */
+          );                           /* A21e, R30, R31 */
+IBM_HANDLE(bay_ej, bay, "_EJ3",        /* 600e/x, A2xm/p, A3x */
+          "_EJ0",              /* all others */
+          );                   /* 570,A21e,G4x,R30,R31,R32,R40e,R50e */
+IBM_HANDLE(bay2, root, "\\_SB.PCI0.IDE0.PRIM.SLAV",    /* A3x, R32 */
+          "\\_SB.PCI0.IDE0.IDEP.IDPS", /* 600e/x, 770e, 770x */
+          );                           /* all others */
+IBM_HANDLE(bay2_ej, bay2, "_EJ3",      /* 600e/x, 770e, A3x */
+          "_EJ0",                      /* 770x */
+          );                           /* all others */
+
 static int bay_init(void)
 {
        bay_status_supported = bay_handle &&
@@ -1031,6 +1152,11 @@ static int bay_init(void)
        return 0;
 }
 
+static void bay_notify(struct ibm_struct *ibm, u32 event)
+{
+       acpi_bus_generate_event(ibm->device, event, 0);
+}
+
 #define bay_occupied(b) (_sta(b##_handle) & 1)
 
 static int bay_read(char *p)
@@ -1081,12 +1207,19 @@ static int bay_write(char *buf)
 
        return 0;
 }
+#endif /* CONFIG_ACPI_IBM_BAY */
 
-static void bay_notify(struct ibm_struct *ibm, u32 event)
+/*************************************************************************
+ * CMOS subdriver
+ */
+
+static int cmos_eval(int cmos_cmd)
 {
-       acpi_bus_generate_event(ibm->device, event, 0);
+       if (cmos_handle)
+               return acpi_evalf(cmos_handle, NULL, NULL, "vd", cmos_cmd);
+       else
+               return 1;
 }
-#endif /* CONFIG_ACPI_IBM_BAY */
 
 static int cmos_read(char *p)
 {
@@ -1104,14 +1237,6 @@ static int cmos_read(char *p)
        return len;
 }
 
-static int cmos_eval(int cmos_cmd)
-{
-       if (cmos_handle)
-               return acpi_evalf(cmos_handle, NULL, NULL, "vd", cmos_cmd);
-       else
-               return 1;
-}
-
 static int cmos_write(char *buf)
 {
        char *cmd;
@@ -1134,8 +1259,18 @@ static int cmos_write(char *buf)
        return 0;
 }
 
+
+/*************************************************************************
+ * LED subdriver
+ */
+
 static enum led_access_mode led_supported;
 
+IBM_HANDLE(led, ec, "SLED",    /* 570 */
+          "SYSL",              /* 600e/x, 770e, 770x, A21e, A2xm/p, T20-22, X20-21 */
+          "LED",               /* all others */
+          );                   /* R30, R31 */
+
 static int led_init(void)
 {
        if (!led_handle)
@@ -1242,6 +1377,12 @@ static int led_write(char *buf)
        return 0;
 }
 
+/*************************************************************************
+ * Beep subdriver
+ */
+
+IBM_HANDLE(beep, ec, "BEEP");  /* all except R30, R31 */
+
 static int beep_read(char *p)
 {
        int len = 0;
@@ -1277,34 +1418,9 @@ static int beep_write(char *buf)
        return 0;
 }
 
-static int acpi_ec_read(int i, u8 * p)
-{
-       int v;
-
-       if (ecrd_handle) {
-               if (!acpi_evalf(ecrd_handle, &v, NULL, "dd", i))
-                       return 0;
-               *p = v;
-       } else {
-               if (ec_read(i, p) < 0)
-                       return 0;
-       }
-
-       return 1;
-}
-
-static int acpi_ec_write(int i, u8 v)
-{
-       if (ecwr_handle) {
-               if (!acpi_evalf(ecwr_handle, NULL, NULL, "vdd", i, v))
-                       return 0;
-       } else {
-               if (ec_write(i, v) < 0)
-                       return 0;
-       }
-
-       return 1;
-}
+/*************************************************************************
+ * Thermal subdriver
+ */
 
 static enum thermal_access_mode thermal_read_mode;
 
@@ -1446,6 +1562,10 @@ static int thermal_read(char *p)
        return len;
 }
 
+/*************************************************************************
+ * EC Dump subdriver
+ */
+
 static u8 ecdump_regs[256];
 
 static int ecdump_read(char *p)
@@ -1505,6 +1625,55 @@ static int ecdump_write(char *buf)
        return 0;
 }
 
+/*************************************************************************
+ * Backlight/brightness subdriver
+ */
+
+static struct backlight_device *ibm_backlight_device = NULL;
+
+static struct backlight_ops ibm_backlight_data = {
+        .get_brightness = brightness_get,
+        .update_status  = brightness_update_status,
+};
+
+static int brightness_init(void)
+{
+       int b;
+
+       b = brightness_get(NULL);
+       if (b < 0)
+               return b;
+
+       ibm_backlight_device = backlight_device_register("ibm", NULL, NULL,
+                                                        &ibm_backlight_data);
+       if (IS_ERR(ibm_backlight_device)) {
+               printk(IBM_ERR "Could not register backlight device\n");
+               return PTR_ERR(ibm_backlight_device);
+       }
+
+       ibm_backlight_device->props.max_brightness = 7;
+       ibm_backlight_device->props.brightness = b;
+       backlight_update_status(ibm_backlight_device);
+
+       return 0;
+}
+
+static void brightness_exit(void)
+{
+       if (ibm_backlight_device) {
+               backlight_device_unregister(ibm_backlight_device);
+               ibm_backlight_device = NULL;
+       }
+}
+
+static int brightness_update_status(struct backlight_device *bd)
+{
+       return brightness_set(
+               (bd->props.fb_blank == FB_BLANK_UNBLANK &&
+                bd->props.power == FB_BLANK_UNBLANK) ?
+                               bd->props.brightness : 0);
+}
+
 static int brightness_get(struct backlight_device *bd)
 {
        u8 level;
@@ -1516,23 +1685,6 @@ static int brightness_get(struct backlight_device *bd)
        return level;
 }
 
-static int brightness_read(char *p)
-{
-       int len = 0;
-       int level;
-
-       if ((level = brightness_get(NULL)) < 0) {
-               len += sprintf(p + len, "level:\t\tunreadable\n");
-       } else {
-               len += sprintf(p + len, "level:\t\t%d\n", level & 0x7);
-               len += sprintf(p + len, "commands:\tup, down\n");
-               len += sprintf(p + len, "commands:\tlevel <level>"
-                              " (<level> is 0-7)\n");
-       }
-
-       return len;
-}
-
 static int brightness_set(int value)
 {
        int cmos_cmd, inc, i;
@@ -1540,8 +1692,7 @@ static int brightness_set(int value)
 
        value &= 7;
 
-       cmos_cmd = value > current_value ?
-                  TP_CMOS_BRIGHTNESS_UP : TP_CMOS_BRIGHTNESS_DOWN;
+       cmos_cmd = value > current_value ? TP_CMOS_BRIGHTNESS_UP : TP_CMOS_BRIGHTNESS_DOWN;
        inc = value > current_value ? 1 : -1;
        for (i = current_value; i != value; i += inc) {
                if (!cmos_eval(cmos_cmd))
@@ -1553,6 +1704,23 @@ static int brightness_set(int value)
        return 0;
 }
 
+static int brightness_read(char *p)
+{
+       int len = 0;
+       int level;
+
+       if ((level = brightness_get(NULL)) < 0) {
+               len += sprintf(p + len, "level:\t\tunreadable\n");
+       } else {
+               len += sprintf(p + len, "level:\t\t%d\n", level & 0x7);
+               len += sprintf(p + len, "commands:\tup, down\n");
+               len += sprintf(p + len, "commands:\tlevel <level>"
+                              " (<level> is 0-7)\n");
+       }
+
+       return len;
+}
+
 static int brightness_write(char *buf)
 {
        int level;
@@ -1580,48 +1748,9 @@ static int brightness_write(char *buf)
        return 0;
 }
 
-static int brightness_update_status(struct backlight_device *bd)
-{
-       return brightness_set(
-               (bd->props.fb_blank == FB_BLANK_UNBLANK &&
-                bd->props.power == FB_BLANK_UNBLANK) ?
-                               bd->props.brightness : 0);
-}
-
-static struct backlight_ops ibm_backlight_data = {
-        .get_brightness = brightness_get,
-        .update_status  = brightness_update_status,
-};
-
-static int brightness_init(void)
-{
-       int b;
-
-       b = brightness_get(NULL);
-       if (b < 0)
-               return b;
-
-       ibm_backlight_device = backlight_device_register("ibm", NULL, NULL,
-                                                        &ibm_backlight_data);
-       if (IS_ERR(ibm_backlight_device)) {
-               printk(IBM_ERR "Could not register backlight device\n");
-               return PTR_ERR(ibm_backlight_device);
-       }
-
-       ibm_backlight_device->props.max_brightness = 7;
-       ibm_backlight_device->props.brightness = b;
-       backlight_update_status(ibm_backlight_device);
-
-       return 0;
-}
-
-static void brightness_exit(void)
-{
-       if (ibm_backlight_device) {
-               backlight_device_unregister(ibm_backlight_device);
-               ibm_backlight_device = NULL;
-       }
-}
+/*************************************************************************
+ * Volume subdriver
+ */
 
 static int volume_read(char *p)
 {
@@ -1673,8 +1802,7 @@ static int volume_write(char *buf)
                        return -EINVAL;
 
                if (new_level != level) {       /* mute doesn't change */
-                       cmos_cmd = new_level > level ?
-                                       TP_CMOS_VOLUME_UP : TP_CMOS_VOLUME_DOWN;
+                       cmos_cmd = new_level > level ? TP_CMOS_VOLUME_UP : TP_CMOS_VOLUME_DOWN;
                        inc = new_level > level ? 1 : -1;
 
                        if (mute && (!cmos_eval(cmos_cmd) ||
@@ -1693,8 +1821,7 @@ static int volume_write(char *buf)
                }
 
                if (new_mute != mute) { /* level doesn't change */
-                       cmos_cmd = new_mute ?
-                                  TP_CMOS_VOLUME_MUTE : TP_CMOS_VOLUME_UP;
+                       cmos_cmd = new_mute ? TP_CMOS_VOLUME_MUTE : TP_CMOS_VOLUME_UP;
 
                        if (!cmos_eval(cmos_cmd) ||
                            !acpi_ec_write(volume_offset, level + new_mute))
@@ -1705,6 +1832,111 @@ static int volume_write(char *buf)
        return 0;
 }
 
+
+/*************************************************************************
+ * Fan subdriver
+ */
+
+/*
+ * FAN ACCESS MODES
+ *
+ * IBMACPI_FAN_RD_ACPI_GFAN:
+ *     ACPI GFAN method: returns fan level
+ *
+ *     see IBMACPI_FAN_WR_ACPI_SFAN
+ *     EC 0x2f not available if GFAN exists
+ *
+ * IBMACPI_FAN_WR_ACPI_SFAN:
+ *     ACPI SFAN method: sets fan level, 0 (stop) to 7 (max)
+ *
+ *     EC 0x2f might be available *for reading*, but never for writing.
+ *
+ * IBMACPI_FAN_WR_TPEC:
+ *     ThinkPad EC register 0x2f (HFSP): fan control loop mode Supported
+ *     on almost all ThinkPads
+ *
+ *     Fan speed changes of any sort (including those caused by the
+ *     disengaged mode) are usually done slowly by the firmware as the
+ *     maximum ammount of fan duty cycle change per second seems to be
+ *     limited.
+ *
+ *     Reading is not available if GFAN exists.
+ *     Writing is not available if SFAN exists.
+ *
+ *     Bits
+ *      7      automatic mode engaged;
+ *             (default operation mode of the ThinkPad)
+ *             fan level is ignored in this mode.
+ *      6      disengage mode (takes precedence over bit 7);
+ *             not available on all thinkpads.  May disable
+ *             the tachometer, and speeds up fan to 100% duty-cycle,
+ *             which speeds it up far above the standard RPM
+ *             levels.  It is not impossible that it could cause
+ *             hardware damage.
+ *     5-3     unused in some models.  Extra bits for fan level
+ *             in others, but still useless as all values above
+ *             7 map to the same speed as level 7 in these models.
+ *     2-0     fan level (0..7 usually)
+ *                     0x00 = stop
+ *                     0x07 = max (set when temperatures critical)
+ *             Some ThinkPads may have other levels, see
+ *             IBMACPI_FAN_WR_ACPI_FANS (X31/X40/X41)
+ *
+ *     FIRMWARE BUG: on some models, EC 0x2f might not be initialized at
+ *     boot. Apparently the EC does not intialize it, so unless ACPI DSDT
+ *     does so, its initial value is meaningless (0x07).
+ *
+ *     For firmware bugs, refer to:
+ *     http://thinkwiki.org/wiki/Embedded_Controller_Firmware#Firmware_Issues
+ *
+ *     ----
+ *
+ *     ThinkPad EC register 0x84 (LSB), 0x85 (MSB):
+ *     Main fan tachometer reading (in RPM)
+ *
+ *     This register is present on all ThinkPads with a new-style EC, and
+ *     it is known not to be present on the A21m/e, and T22, as there is
+ *     something else in offset 0x84 according to the ACPI DSDT.  Other
+ *     ThinkPads from this same time period (and earlier) probably lack the
+ *     tachometer as well.
+ *
+ *     Unfortunately a lot of ThinkPads with new-style ECs but whose firwmare
+ *     was never fixed by IBM to report the EC firmware version string
+ *     probably support the tachometer (like the early X models), so
+ *     detecting it is quite hard.  We need more data to know for sure.
+ *
+ *     FIRMWARE BUG: always read 0x84 first, otherwise incorrect readings
+ *     might result.
+ *
+ *     FIRMWARE BUG: when EC 0x2f bit 6 is set (disengaged mode), this
+ *     register is not invalidated in ThinkPads that disable tachometer
+ *     readings.  Thus, the tachometer readings go stale.
+ *
+ *     For firmware bugs, refer to:
+ *     http://thinkwiki.org/wiki/Embedded_Controller_Firmware#Firmware_Issues
+ *
+ * IBMACPI_FAN_WR_ACPI_FANS:
+ *     ThinkPad X31, X40, X41.  Not available in the X60.
+ *
+ *     FANS ACPI handle: takes three arguments: low speed, medium speed,
+ *     high speed.  ACPI DSDT seems to map these three speeds to levels
+ *     as follows: STOP LOW LOW MED MED HIGH HIGH HIGH HIGH
+ *     (this map is stored on FAN0..FAN8 as "0,1,1,2,2,3,3,3,3")
+ *
+ *     The speeds are stored on handles
+ *     (FANA:FAN9), (FANC:FANB), (FANE:FAND).
+ *
+ *     There are three default speed sets, acessible as handles:
+ *     FS1L,FS1M,FS1H; FS2L,FS2M,FS2H; FS3L,FS3M,FS3H
+ *
+ *     ACPI DSDT switches which set is in use depending on various
+ *     factors.
+ *
+ *     IBMACPI_FAN_WR_TPEC is also available and should be used to
+ *     command the fan.  The X31/X40/X41 seems to have 8 fan levels,
+ *     but the ACPI tables just mention level 7.
+ */
+
 static enum fan_status_access_mode fan_status_access_mode;
 static enum fan_control_access_mode fan_control_access_mode;
 static enum fan_control_commands fan_control_commands;
@@ -1716,6 +1948,14 @@ static void fan_watchdog_fire(struct work_struct *ignored);
 static int fan_watchdog_maxinterval;
 static DECLARE_DELAYED_WORK(fan_watchdog_task, fan_watchdog_fire);
 
+IBM_HANDLE(fans, ec, "FANS");  /* X31, X40, X41 */
+IBM_HANDLE(gfan, ec, "GFAN",   /* 570 */
+          "\\FSPD",            /* 600e/x, 770e, 770x */
+          );                   /* all others */
+IBM_HANDLE(sfan, ec, "SFAN",   /* 570 */
+          "JFNS",              /* 770x-JL */
+          );                   /* all others */
+
 static int fan_init(void)
 {
        fan_status_access_mode = IBMACPI_FAN_NONE;
@@ -1831,6 +2071,12 @@ static int fan_get_status(u8 *status)
        return 0;
 }
 
+static void fan_exit(void)
+{
+       cancel_delayed_work(&fan_watchdog_task);
+       flush_scheduled_work();
+}
+
 static int fan_get_speed(unsigned int *speed)
 {
        u8 hi, lo;
@@ -1854,10 +2100,14 @@ static int fan_get_speed(unsigned int *speed)
        return 0;
 }
 
-static void fan_exit(void)
+static void fan_watchdog_fire(struct work_struct *ignored)
 {
-       cancel_delayed_work(&fan_watchdog_task);
-       flush_scheduled_work();
+       printk(IBM_NOTICE "fan watchdog: enabling fan\n");
+       if (fan_set_enable()) {
+               printk(IBM_ERR "fan watchdog: error while enabling fan\n");
+               /* reschedule for later */
+               fan_watchdog_reset();
+       }
 }
 
 static void fan_watchdog_reset(void)
@@ -1879,90 +2129,6 @@ static void fan_watchdog_reset(void)
                fan_watchdog_active = 0;
 }
 
-static int fan_read(char *p)
-{
-       int len = 0;
-       int rc;
-       u8 status;
-       unsigned int speed = 0;
-
-       switch (fan_status_access_mode) {
-       case IBMACPI_FAN_RD_ACPI_GFAN:
-               /* 570, 600e/x, 770e, 770x */
-               if ((rc = fan_get_status(&status)) < 0)
-                       return rc;
-
-               len += sprintf(p + len, "status:\t\t%s\n"
-                              "level:\t\t%d\n",
-                              (status != 0) ? "enabled" : "disabled", status);
-               break;
-
-       case IBMACPI_FAN_RD_TPEC:
-               /* all except 570, 600e/x, 770e, 770x */
-               if ((rc = fan_get_status(&status)) < 0)
-                       return rc;
-
-               if (unlikely(!fan_control_status_known)) {
-                       if (status != fan_control_initial_status)
-                               fan_control_status_known = 1;
-                       else
-                               /* Return most likely status. In fact, it
-                                * might be the only possible status */
-                               status = IBMACPI_FAN_EC_AUTO;
-               }
-
-               len += sprintf(p + len, "status:\t\t%s\n",
-                              (status != 0) ? "enabled" : "disabled");
-
-               /* No ThinkPad boots on disengaged mode, we can safely
-                * assume the tachometer is online if fan control status
-                * was unknown */
-               if ((rc = fan_get_speed(&speed)) < 0)
-                       return rc;
-
-               len += sprintf(p + len, "speed:\t\t%d\n", speed);
-
-               if (status & IBMACPI_FAN_EC_DISENGAGED)
-                       /* Disengaged mode takes precedence */
-                       len += sprintf(p + len, "level:\t\tdisengaged\n");
-               else if (status & IBMACPI_FAN_EC_AUTO)
-                       len += sprintf(p + len, "level:\t\tauto\n");
-               else
-                       len += sprintf(p + len, "level:\t\t%d\n", status);
-               break;
-
-       case IBMACPI_FAN_NONE:
-       default:
-               len += sprintf(p + len, "status:\t\tnot supported\n");
-       }
-
-       if (fan_control_commands & IBMACPI_FAN_CMD_LEVEL) {
-               len += sprintf(p + len, "commands:\tlevel <level>");
-
-               switch (fan_control_access_mode) {
-               case IBMACPI_FAN_WR_ACPI_SFAN:
-                       len += sprintf(p + len, " (<level> is 0-7)\n");
-                       break;
-
-               default:
-                       len += sprintf(p + len, " (<level> is 0-7, "
-                                      "auto, disengaged)\n");
-                       break;
-               }
-       }
-
-       if (fan_control_commands & IBMACPI_FAN_CMD_ENABLE)
-               len += sprintf(p + len, "commands:\tenable, disable\n"
-                              "commands:\twatchdog <timeout> (<timeout> is 0 (off), "
-                              "1-120 (seconds))\n");
-
-       if (fan_control_commands & IBMACPI_FAN_CMD_SPEED)
-               len += sprintf(p + len, "commands:\tspeed <speed>"
-                              " (<speed> is 0-65535)\n");
-
-       return len;
-}
-
 static int fan_set_level(int level)
 {
        switch (fan_control_access_mode) {
@@ -2053,25 +2219,109 @@ static int fan_set_disable(void)
        default:
                return -ENXIO;
        }
-       return 0;
-}
+       return 0;
+}
+
+static int fan_set_speed(int speed)
+{
+       switch (fan_control_access_mode) {
+       case IBMACPI_FAN_WR_ACPI_FANS:
+               if (speed >= 0 && speed <= 65535) {
+                       if (!acpi_evalf(fans_handle, NULL, NULL, "vddd",
+                                       speed, speed, speed))
+                               return -EIO;
+               } else
+                       return -EINVAL;
+               break;
+
+       default:
+               return -ENXIO;
+       }
+       return 0;
+}
+
+static int fan_read(char *p)
+{
+       int len = 0;
+       int rc;
+       u8 status;
+       unsigned int speed = 0;
+
+       switch (fan_status_access_mode) {
+       case IBMACPI_FAN_RD_ACPI_GFAN:
+               /* 570, 600e/x, 770e, 770x */
+               if ((rc = fan_get_status(&status)) < 0)
+                       return rc;
+
+               len += sprintf(p + len, "status:\t\t%s\n"
+                              "level:\t\t%d\n",
+                              (status != 0) ? "enabled" : "disabled", status);
+               break;
+
+       case IBMACPI_FAN_RD_TPEC:
+               /* all except 570, 600e/x, 770e, 770x */
+               if ((rc = fan_get_status(&status)) < 0)
+                       return rc;
+
+               if (unlikely(!fan_control_status_known)) {
+                       if (status != fan_control_initial_status)
+                               fan_control_status_known = 1;
+                       else
+                               /* Return most likely status. In fact, it
+                                * might be the only possible status */
+                               status = IBMACPI_FAN_EC_AUTO;
+               }
+
+               len += sprintf(p + len, "status:\t\t%s\n",
+                              (status != 0) ? "enabled" : "disabled");
+
+               /* No ThinkPad boots on disengaged mode, we can safely
+                * assume the tachometer is online if fan control status
+                * was unknown */
+               if ((rc = fan_get_speed(&speed)) < 0)
+                       return rc;
+
+               len += sprintf(p + len, "speed:\t\t%d\n", speed);
+
+               if (status & IBMACPI_FAN_EC_DISENGAGED)
+                       /* Disengaged mode takes precedence */
+                       len += sprintf(p + len, "level:\t\tdisengaged\n");
+               else if (status & IBMACPI_FAN_EC_AUTO)
+                       len += sprintf(p + len, "level:\t\tauto\n");
+               else
+                       len += sprintf(p + len, "level:\t\t%d\n", status);
+               break;
+
+       case IBMACPI_FAN_NONE:
+       default:
+               len += sprintf(p + len, "status:\t\tnot supported\n");
+       }
+
+       if (fan_control_commands & IBMACPI_FAN_CMD_LEVEL) {
+               len += sprintf(p + len, "commands:\tlevel <level>");
+
+               switch (fan_control_access_mode) {
+               case IBMACPI_FAN_WR_ACPI_SFAN:
+                       len += sprintf(p + len, " (<level> is 0-7)\n");
+                       break;
+
+               default:
+                       len += sprintf(p + len, " (<level> is 0-7, "
+                                      "auto, disengaged)\n");
+                       break;
+               }
+       }
 
-static int fan_set_speed(int speed)
-{
-       switch (fan_control_access_mode) {
-       case IBMACPI_FAN_WR_ACPI_FANS:
-               if (speed >= 0 && speed <= 65535) {
-                       if (!acpi_evalf(fans_handle, NULL, NULL, "vddd",
-                                       speed, speed, speed))
-                               return -EIO;
-               } else
-                       return -EINVAL;
-               break;
+       if (fan_control_commands & IBMACPI_FAN_CMD_ENABLE)
+               len += sprintf(p + len, "commands:\tenable, disable\n"
+                              "commands:\twatchdog <timeout> (<timeout> is 0 (off), "
+                              "1-120 (seconds))\n");
 
-       default:
-               return -ENXIO;
-       }
-       return 0;
+       if (fan_control_commands & IBMACPI_FAN_CMD_SPEED)
+               len += sprintf(p + len, "commands:\tspeed <speed>"
+                              " (<speed> is 0-65535)\n");
+
+       return len;
 }
 
 static int fan_write_cmd_level(const char *cmd, int *rc)
@@ -2171,16 +2421,18 @@ static int fan_write(char *buf)
        return rc;
 }
 
-static void fan_watchdog_fire(struct work_struct *ignored)
-{
-       printk(IBM_NOTICE "fan watchdog: enabling fan\n");
-       if (fan_set_enable()) {
-               printk(IBM_ERR "fan watchdog: error while enabling fan\n");
-               /* reschedule for later */
-               fan_watchdog_reset();
-       }
-}
+/****************************************************************************
+ ****************************************************************************
+ *
+ * Infrastructure
+ *
+ ****************************************************************************
+ ****************************************************************************/
+
+/* /proc support */
+static struct proc_dir_entry *proc_dir = NULL;
 
+/* Subdriver registry */
 static struct ibm_struct ibms[] = {
        {
         .name = "driver",
@@ -2301,132 +2553,9 @@ static struct ibm_struct ibms[] = {
         },
 };
 
-static int dispatch_read(char *page, char **start, off_t off, int count,
-                        int *eof, void *data)
-{
-       struct ibm_struct *ibm = data;
-       int len;
-
-       if (!ibm || !ibm->read)
-               return -EINVAL;
-
-       len = ibm->read(page);
-       if (len < 0)
-               return len;
-
-       if (len <= off + count)
-               *eof = 1;
-       *start = page + off;
-       len -= off;
-       if (len > count)
-               len = count;
-       if (len < 0)
-               len = 0;
-
-       return len;
-}
-
-static int dispatch_write(struct file *file, const char __user * userbuf,
-                         unsigned long count, void *data)
-{
-       struct ibm_struct *ibm = data;
-       char *kernbuf;
-       int ret;
-
-       if (!ibm || !ibm->write)
-               return -EINVAL;
-
-       kernbuf = kmalloc(count + 2, GFP_KERNEL);
-       if (!kernbuf)
-               return -ENOMEM;
-
-       if (copy_from_user(kernbuf, userbuf, count)) {
-               kfree(kernbuf);
-               return -EFAULT;
-       }
-
-       kernbuf[count] = 0;
-       strcat(kernbuf, ",");
-       ret = ibm->write(kernbuf);
-       if (ret == 0)
-               ret = count;
-
-       kfree(kernbuf);
-
-       return ret;
-}
-
-static void dispatch_notify(acpi_handle handle, u32 event, void *data)
-{
-       struct ibm_struct *ibm = data;
-
-       if (!ibm || !ibm->notify)
-               return;
-
-       ibm->notify(ibm, event);
-}
-
-static int __init setup_notify(struct ibm_struct *ibm)
-{
-       acpi_status status;
-       int ret;
-
-       if (!*ibm->handle)
-               return 0;
-
-       ret = acpi_bus_get_device(*ibm->handle, &ibm->device);
-       if (ret < 0) {
-               printk(IBM_ERR "%s device not present\n", ibm->name);
-               return -ENODEV;
-       }
-
-       acpi_driver_data(ibm->device) = ibm;
-       sprintf(acpi_device_class(ibm->device), "%s/%s", IBM_NAME, ibm->name);
-
-       status = acpi_install_notify_handler(*ibm->handle, ibm->type,
-                                            dispatch_notify, ibm);
-       if (ACPI_FAILURE(status)) {
-               if (status == AE_ALREADY_EXISTS) {
-                       printk(IBM_NOTICE "another device driver is already handling %s events\n",
-                               ibm->name);
-               } else {
-                       printk(IBM_ERR "acpi_install_notify_handler(%s) failed: %d\n",
-                               ibm->name, status);
-               }
-               return -ENODEV;
-       }
-       ibm->notify_installed = 1;
-       return 0;
-}
-
-static int __init ibm_device_add(struct acpi_device *device)
-{
-       return 0;
-}
-
-static int __init register_ibmacpi_subdriver(struct ibm_struct *ibm)
-{
-       int ret;
-
-       ibm->driver = kzalloc(sizeof(struct acpi_driver), GFP_KERNEL);
-       if (!ibm->driver) {
-               printk(IBM_ERR "kmalloc(ibm->driver) failed\n");
-               return -1;
-       }
-
-       sprintf(ibm->driver->name, "%s_%s", IBM_NAME, ibm->name);
-       ibm->driver->ids = ibm->hid;
-       ibm->driver->ops.add = &ibm_device_add;
-
-       ret = acpi_bus_register_driver(ibm->driver);
-       if (ret < 0) {
-               printk(IBM_ERR "acpi_bus_register_driver(%s) failed: %d\n",
-                      ibm->hid, ret);
-               kfree(ibm->driver);
-       }
-
-       return ret;
-}
+/*
+ * Module and infrastructure proble, init and exit handling
+ */
 
 static int __init ibm_init(struct ibm_struct *ibm)
 {
@@ -2500,27 +2629,35 @@ static void ibm_exit(struct ibm_struct *ibm)
        }
 }
 
-static void __init ibm_handle_init(char *name,
-                                  acpi_handle * handle, acpi_handle parent,
-                                  char **paths, int num_paths, char **path)
+/* Probing */
+
+static char *ibm_thinkpad_ec_found = NULL;
+
+static char* __init check_dmi_for_ec(void)
 {
-       int i;
-       acpi_status status;
+       struct dmi_device *dev = NULL;
+       char ec_fw_string[18];
 
-       for (i = 0; i < num_paths; i++) {
-               status = acpi_get_handle(parent, paths[i], handle);
-               if (ACPI_SUCCESS(status)) {
-                       *path = paths[i];
-                       return;
+       /*
+        * ThinkPad T23 or newer, A31 or newer, R50e or newer,
+        * X32 or newer, all Z series;  Some models must have an
+        * up-to-date BIOS or they will not be detected.
+        *
+        * See http://thinkwiki.org/wiki/List_of_DMI_IDs
+        */
+       while ((dev = dmi_find_device(DMI_DEV_TYPE_OEM_STRING, NULL, dev))) {
+               if (sscanf(dev->name,
+                          "IBM ThinkPad Embedded Controller -[%17c",
+                          ec_fw_string) == 1) {
+                       ec_fw_string[sizeof(ec_fw_string) - 1] = 0;
+                       ec_fw_string[strcspn(ec_fw_string, " ]")] = 0;
+                       return kstrdup(ec_fw_string, GFP_KERNEL);
                }
        }
-
-       *handle = NULL;
+       return NULL;
 }
 
-#define IBM_HANDLE_INIT(object)                                                \
-       ibm_handle_init(#object, &object##_handle, *object##_parent,    \
-               object##_paths, ARRAY_SIZE(object##_paths), &object##_path)
+/* Module init, exit, parameters */
 
 static int __init set_ibm_param(const char *val, struct kernel_param *kp)
 {
@@ -2538,6 +2675,9 @@ static int __init set_ibm_param(const char *val, struct kernel_param *kp)
        return -EINVAL;
 }
 
+static int experimental;
+module_param(experimental, int, 0);
+
 #define IBM_PARAM(feature) \
        module_param_call(feature, set_ibm_param, NULL, NULL, 0)
 
@@ -2559,44 +2699,6 @@ IBM_PARAM(brightness);
 IBM_PARAM(volume);
 IBM_PARAM(fan);
 
-static void acpi_ibm_exit(void)
-{
-       int i;
-
-       for (i = ARRAY_SIZE(ibms) - 1; i >= 0; i--)
-               ibm_exit(&ibms[i]);
-
-       if (proc_dir)
-               remove_proc_entry(IBM_DIR, acpi_root_dir);
-
-       if (ibm_thinkpad_ec_found)
-               kfree(ibm_thinkpad_ec_found);
-}
-
-static char* __init check_dmi_for_ec(void)
-{
-       struct dmi_device *dev = NULL;
-       char ec_fw_string[18];
-
-       /*
-        * ThinkPad T23 or newer, A31 or newer, R50e or newer,
-        * X32 or newer, all Z series;  Some models must have an
-        * up-to-date BIOS or they will not be detected.
-        *
-        * See http://thinkwiki.org/wiki/List_of_DMI_IDs
-        */
-       while ((dev = dmi_find_device(DMI_DEV_TYPE_OEM_STRING, NULL, dev))) {
-               if (sscanf(dev->name,
-                          "IBM ThinkPad Embedded Controller -[%17c",
-                          ec_fw_string) == 1) {
-                       ec_fw_string[sizeof(ec_fw_string) - 1] = 0;
-                       ec_fw_string[strcspn(ec_fw_string, " ]")] = 0;
-                       return kstrdup(ec_fw_string, GFP_KERNEL);
-               }
-       }
-       return NULL;
-}
-
 static int __init acpi_ibm_init(void)
 {
        int ret, i;
@@ -2662,5 +2764,19 @@ static int __init acpi_ibm_init(void)
        return 0;
 }
 
+static void acpi_ibm_exit(void)
+{
+       int i;
+
+       for (i = ARRAY_SIZE(ibms) - 1; i >= 0; i--)
+               ibm_exit(&ibms[i]);
+
+       if (proc_dir)
+               remove_proc_entry(IBM_DIR, acpi_root_dir);
+
+       if (ibm_thinkpad_ec_found)
+               kfree(ibm_thinkpad_ec_found);
+}
+
 module_init(acpi_ibm_init);
 module_exit(acpi_ibm_exit);