+++ /dev/null
-/*
- * hwmon driver for temperature/power/fan on IBM PowerNV platform
- * Copyright (C) 2013 IBM
- *
- * 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/init.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/hwmon.h>
-#include <linux/hwmon-sysfs.h>
-#include <linux/of.h>
-#include <linux/slab.h>
-
-#include <linux/jiffies.h>
-#include <linux/platform_device.h>
-#include <asm/opal.h>
-#include <linux/err.h>
-
-MODULE_DESCRIPTION("IBM PowerNV Platform power/temp/fan sensor hwmon module");
-MODULE_LICENSE("GPL");
-
-#define MAX_ATTR_LENGTH 32
-
-/* Device tree sensor name prefixes. The device tree has the names in the
- * format "cooling-fan#2-faulted" where the "cooling-fan" is the sensor type,
- * 2 is the sensor count, and "faulted" is the sensor data attribute type.
- */
-#define DT_FAULT_ATTR_SUFFIX "faulted"
-#define DT_DATA_ATTR_SUFFIX "data"
-#define DT_THRESHOLD_ATTR_SUFFIX "thrs"
-
-enum sensors {
- FAN,
- TEMPERATURE,
- POWERSUPPLY,
- POWER,
- MAX_SENSOR_TYPE,
-};
-
-enum attributes {
- INPUT,
- MINIMUM,
- MAXIMUM,
- FAULT,
- MAX_ATTR_TYPES
-};
-
-static struct sensor_name {
- char *name;
- char *compaible;
-} sensor_names[] = {
- {"fan-sensor", "ibm,opal-sensor-cooling-fan"},
- {"amb-temp-sensor", "ibm,opal-sensor-amb-temp"},
- {"power-sensor", "ibm,opal-sensor-power-supply"},
- {"power", "ibm,opal-sensor-power"}
-};
-
-static const char * const attribute_type_table[] = {
- "input",
- "min",
- "max",
- "fault",
- NULL
-};
-
-struct pdev_entry {
- struct list_head list;
- struct platform_device *pdev;
- enum sensors type;
-};
-
-static LIST_HEAD(pdev_list);
-
-/* The sensors are categorised on type.
- *
- * The sensors of same type are categorised under a common platform device.
- * So, The pdev is shared by all sensors of same type.
- * Ex : temp1_input, temp1_max, temp2_input,temp2_max all share same platform
- * device.
- *
- * "sensor_data" is the Platform device specific data.
- * There is one hwmon_device instance for all the sensors of same type.
- * This also holds the list of all sensors with same type but different
- * attribute and index.
- */
-struct sensor_specific_data {
- u32 sensor_id; /* The hex value as in the device tree */
- u32 sensor_index; /* The sensor instance index */
- struct sensor_device_attribute sd_attr;
- enum attributes attr_type;
- char attr_name[64];
-};
-
-struct sensor_data {
- struct device *hwmon_dev;
- struct list_head sensor_list;
- struct device_attribute name_attr;
-};
-
-struct sensor_entry {
- struct list_head list;
- struct sensor_specific_data *sensor_data;
-};
-
-static struct platform_device *powernv_sensor_get_pdev(enum sensors type)
-{
- struct pdev_entry *p;
- list_for_each_entry(p, &pdev_list, list)
- if (p->type == type)
- return p->pdev;
-
- return NULL;
-}
-
-static struct sensor_specific_data *powernv_sensor_get_sensor_data(
- struct sensor_data *pdata,
- int index, enum attributes attr_type)
-{
- struct sensor_entry *p;
- list_for_each_entry(p, &pdata->sensor_list, list)
- if ((p->sensor_data->sensor_index == index) &&
- (attr_type == p->sensor_data->attr_type))
- return p->sensor_data;
-
- return NULL;
-}
-
-static ssize_t show_name(struct device *dev,
- struct device_attribute *devattr, char *buf)
-{
- struct platform_device *pdev = to_platform_device(dev);
-
- return sprintf(buf, "%s\n", pdev->name);
-}
-
-/* Note: Data from the sensors for each sensor type needs to be converted to
- * the dimension appropriate.
- */
-static ssize_t show_sensor(struct device *dev,
- struct device_attribute *devattr, char *buf)
-{
- struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(devattr);
- struct platform_device *pdev = to_platform_device(dev);
- struct sensor_data *pdata = platform_get_drvdata(pdev);
- struct sensor_specific_data *tdata = NULL;
- enum sensors sensor_type = pdev->id;
- u32 x = -1;
- int ret;
-
- if (sd_attr && sd_attr->dev_attr.attr.name) {
- char *pos = strchr(sd_attr->dev_attr.attr.name, '_');
- int i;
-
- for (i = 0; i < MAX_ATTR_TYPES; i++) {
- if (strcmp(pos+1, attribute_type_table[i]) == 0) {
- tdata = powernv_sensor_get_sensor_data(pdata,
- sd_attr->index, i);
- break;
- }
- }
- }
-
- if (tdata) {
- ret = opal_get_sensor_data(tdata->sensor_id, &x);
- if (ret)
- x = -1;
- }
-
- if (sensor_type == TEMPERATURE && x > 0) {
- /* Temperature comes in Degrees and convert it to
- * milli-degrees.
- */
- x = x*1000;
- } else if (sensor_type == POWER && x > 0) {
- /* Power value comes in watts, convert to micro-watts */
- x = x * 1000000;
- }
-
- return sprintf(buf, "%d\n", x);
-}
-
-static u32 get_sensor_index_from_name(const char *name)
-{
- char *hash_position = strchr(name, '#');
- u32 index = 0, copy_length;
- char newbuf[8];
-
- if (hash_position) {
- copy_length = strchr(hash_position, '-') - hash_position - 1;
- if (copy_length < sizeof(newbuf)) {
- strncpy(newbuf, hash_position + 1, copy_length);
- sscanf(newbuf, "%d", &index);
- }
- }
-
- return index;
-}
-
-static inline void get_sensor_suffix_from_name(const char *name, char *suffix)
-{
- char *dash_position = strrchr(name, '-');
- if (dash_position)
- strncpy(suffix, dash_position+1, MAX_ATTR_LENGTH);
- else
- strcpy(suffix,"");
-}
-
-static int get_sensor_attr_properties(const char *sensor_name,
- enum sensors sensor_type, enum attributes *attr_type,
- u32 *sensor_index)
-{
- char suffix[MAX_ATTR_LENGTH];
-
- *attr_type = MAX_ATTR_TYPES;
- *sensor_index = get_sensor_index_from_name(sensor_name);
- if (*sensor_index == 0)
- return -EINVAL;
-
- get_sensor_suffix_from_name(sensor_name, suffix);
- if (strcmp(suffix, "") == 0)
- return -EINVAL;
-
- if (strcmp(suffix, DT_FAULT_ATTR_SUFFIX) == 0)
- *attr_type = FAULT;
- else if (strcmp(suffix, DT_DATA_ATTR_SUFFIX) == 0)
- *attr_type = INPUT;
- else if ((sensor_type == TEMPERATURE) &&
- (strcmp(suffix, DT_THRESHOLD_ATTR_SUFFIX) == 0))
- *attr_type = MAXIMUM;
- else if ((sensor_type == FAN) &&
- (strcmp(suffix, DT_THRESHOLD_ATTR_SUFFIX) == 0))
- *attr_type = MINIMUM;
- else
- return -ENOENT;
-
- if (((sensor_type == FAN) && ((*attr_type == INPUT) ||
- (*attr_type == MINIMUM)))
- || ((sensor_type == TEMPERATURE) && ((*attr_type == INPUT) ||
- (*attr_type == MAXIMUM)))
- || ((sensor_type == POWER) && ((*attr_type == INPUT))))
- return 0;
-
- return -ENOENT;
-}
-
-static int create_sensor_attr(struct sensor_specific_data *tdata,
- struct device *dev, enum sensors sensor_type,
- enum attributes attr_type)
-{
- int err = 0;
- char temp_file_prefix[50];
- static const char *const file_name_format = "%s%d_%s";
-
- tdata->attr_type = attr_type;
-
- if (sensor_type == FAN)
- strcpy(temp_file_prefix, "fan");
- else if (sensor_type == TEMPERATURE)
- strcpy(temp_file_prefix, "temp");
- else if (sensor_type == POWERSUPPLY)
- strcpy(temp_file_prefix, "powersupply");
- else if (sensor_type == POWER)
- strcpy(temp_file_prefix, "power");
-
- snprintf(tdata->attr_name, sizeof(tdata->attr_name), file_name_format,
- temp_file_prefix, tdata->sensor_index,
- attribute_type_table[tdata->attr_type]);
-
- sysfs_attr_init(&tdata->sd_attr.dev_attr.attr);
- tdata->sd_attr.dev_attr.attr.name = tdata->attr_name;
- tdata->sd_attr.dev_attr.attr.mode = S_IRUGO;
- tdata->sd_attr.dev_attr.show = show_sensor;
-
- tdata->sd_attr.index = tdata->sensor_index;
- err = device_create_file(dev, &tdata->sd_attr.dev_attr);
-
- return err;
-}
-
-static int create_name_attr(struct sensor_data *pdata,
- struct device *dev)
-{
- sysfs_attr_init(&pdata->name_attr.attr);
- pdata->name_attr.attr.name = "name";
- pdata->name_attr.attr.mode = S_IRUGO;
- pdata->name_attr.show = show_name;
- return device_create_file(dev, &pdata->name_attr);
-}
-
-static int create_platform_device(enum sensors sensor_type,
- struct platform_device **pdev)
-{
- struct pdev_entry *pdev_entry = NULL;
- int err;
-
- *pdev = platform_device_alloc(sensor_names[sensor_type].name,
- sensor_type);
- if (!*pdev) {
- pr_err("Device allocation failed\n");
- err = -ENOMEM;
- goto exit;
- }
-
- pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
- if (!pdev_entry) {
- pr_err("Device allocation failed\n");
- err = -ENOMEM;
- goto exit_device_put;
- }
-
- err = platform_device_add(*pdev);
- if (err) {
- pr_err("Device addition failed (%d)\n", err);
- goto exit_device_free;
- }
-
- pdev_entry->pdev = *pdev;
- pdev_entry->type = (*pdev)->id;
-
- list_add_tail(&pdev_entry->list, &pdev_list);
-
- return 0;
-exit_device_free:
- kfree(pdev_entry);
-exit_device_put:
- platform_device_put(*pdev);
-exit:
- return err;
-}
-
-static int create_sensor_data(struct platform_device *pdev)
-{
- struct sensor_data *pdata = NULL;
- int err = 0;
-
- pdata = kzalloc(sizeof(struct sensor_data), GFP_KERNEL);
- if (!pdata) {
- err = -ENOMEM;
- goto exit;
- }
-
- err = create_name_attr(pdata, &pdev->dev);
- if (err)
- goto exit_free;
-
- pdata->hwmon_dev = hwmon_device_register(&pdev->dev);
- if (IS_ERR(pdata->hwmon_dev)) {
- err = PTR_ERR(pdata->hwmon_dev);
- dev_err(&pdev->dev, "Class registration failed (%d)\n",
- err);
- goto exit_name;
- }
-
- INIT_LIST_HEAD(&pdata->sensor_list);
- platform_set_drvdata(pdev, pdata);
-
- return 0;
-
-exit_name:
- device_remove_file(&pdev->dev, &pdata->name_attr);
-exit_free:
- kfree(pdata);
-exit:
- return err;
-}
-
-static void delete_sensor_attr(struct sensor_data *pdata)
-{
- struct sensor_entry *s, *l;
-
- list_for_each_entry_safe(s, l, &pdata->sensor_list, list) {
- struct sensor_specific_data *tdata = s->sensor_data;
- kfree(tdata);
- list_del(&s->list);
- kfree(s);
- }
-}
-
-static int powernv_sensor_init(u32 sensor_id, const struct device_node *np,
- enum sensors sensor_type, enum attributes attr_type,
- u32 sensor_index)
-{
- struct platform_device *pdev = powernv_sensor_get_pdev(sensor_type);
- struct sensor_specific_data *tdata;
- struct sensor_entry *sensor_entry;
- struct sensor_data *pdata;
- int err = 0;
-
- if (!pdev) {
- err = create_platform_device(sensor_type, &pdev);
- if (err)
- goto exit;
-
- err = create_sensor_data(pdev);
- if (err)
- goto exit;
- }
-
- pdata = platform_get_drvdata(pdev);
- if (!pdata) {
- err = -ENOMEM;
- goto exit;
- }
-
- tdata = kzalloc(sizeof(struct sensor_specific_data), GFP_KERNEL);
- if (!tdata) {
- err = -ENOMEM;
- goto exit;
- }
-
- tdata->sensor_id = sensor_id;
- tdata->sensor_index = sensor_index;
-
- err = create_sensor_attr(tdata, &pdev->dev, sensor_type, attr_type);
- if (err)
- goto exit_free;
-
- sensor_entry = kzalloc(sizeof(struct sensor_entry), GFP_KERNEL);
- if (!sensor_entry) {
- err = -ENOMEM;
- goto exit_attr;
- }
-
- sensor_entry->sensor_data = tdata;
-
- list_add_tail(&sensor_entry->list, &pdata->sensor_list);
-
- return 0;
-exit_attr:
- device_remove_file(&pdev->dev, &tdata->sd_attr.dev_attr);
-exit_free:
- kfree(tdata);
-exit:
- return err;
-}
-
-static void delete_unregister_sensors(void)
-{
- struct pdev_entry *p, *n;
-
- list_for_each_entry_safe(p, n, &pdev_list, list) {
- struct sensor_data *pdata = platform_get_drvdata(p->pdev);
- if (pdata) {
- delete_sensor_attr(pdata);
-
- hwmon_device_unregister(pdata->hwmon_dev);
- kfree(pdata);
- }
- platform_device_unregister(p->pdev);
- list_del(&p->list);
- kfree(p);
- }
-}
-
-static int __init powernv_hwmon_init(void)
-{
- struct device_node *opal, *np = NULL;
- enum attributes attr_type;
- enum sensors type;
- const u32 *sensor_id;
- u32 sensor_index;
- int err;
-
- opal = of_find_node_by_path("/ibm,opal/sensors");
- if (!opal) {
- pr_err("%s: Opal 'sensors' node not found\n", __func__);
- return -ENXIO;
- }
-
- for_each_child_of_node(opal, np) {
- if (np->name == NULL)
- continue;
-
- for (type = 0; type < MAX_SENSOR_TYPE; type++)
- if (of_device_is_compatible(np,
- sensor_names[type].compaible))
- break;
-
- if (type == MAX_SENSOR_TYPE)
- continue;
-
- if (get_sensor_attr_properties(np->name, type, &attr_type,
- &sensor_index))
- continue;
-
- sensor_id = of_get_property(np, "sensor-id", NULL);
- if (!sensor_id) {
- pr_info("%s: %s doesn't have sensor-id\n", __func__,
- np->name);
- continue;
- }
-
- err = powernv_sensor_init(*sensor_id, np, type, attr_type,
- sensor_index);
- if (err) {
- of_node_put(opal);
- goto exit;
- }
- }
- of_node_put(opal);
-
- return 0;
-exit:
- delete_unregister_sensors();
- return err;
-
-}
-
-static void powernv_hwmon_exit(void)
-{
- delete_unregister_sensors();
-}
-
-module_init(powernv_hwmon_init);
-module_exit(powernv_hwmon_exit);
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