thermal: add hwmon sysfs I/F

Add hwmon sys I/F for generic thermal driver.

Note: we have one hwmon class device for EACH TYPE of the thermal zone device.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Zhang Rui 2008-04-21 16:07:52 +08:00 committed by Len Brown
parent 9ec732ff80
commit e68b16abd9
2 changed files with 187 additions and 0 deletions

View file

@ -295,6 +295,164 @@ thermal_cooling_device_trip_point_show(struct device *dev,
/* Device management */
#if defined(CONFIG_HWMON) || \
(defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE))
/* hwmon sys I/F */
#include <linux/hwmon.h>
static LIST_HEAD(thermal_hwmon_list);
static ssize_t
name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct thermal_hwmon_device *hwmon = dev->driver_data;
return sprintf(buf, "%s\n", hwmon->type);
}
static DEVICE_ATTR(name, 0444, name_show, NULL);
static ssize_t
temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct thermal_hwmon_attr *hwmon_attr
= container_of(attr, struct thermal_hwmon_attr, attr);
struct thermal_zone_device *tz
= container_of(hwmon_attr, struct thermal_zone_device,
temp_input);
return tz->ops->get_temp(tz, buf);
}
static ssize_t
temp_crit_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct thermal_hwmon_attr *hwmon_attr
= container_of(attr, struct thermal_hwmon_attr, attr);
struct thermal_zone_device *tz
= container_of(hwmon_attr, struct thermal_zone_device,
temp_crit);
return tz->ops->get_trip_temp(tz, 0, buf);
}
static int
thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
{
struct thermal_hwmon_device *hwmon;
int new_hwmon_device = 1;
int result;
mutex_lock(&thermal_list_lock);
list_for_each_entry(hwmon, &thermal_hwmon_list, node)
if (!strcmp(hwmon->type, tz->type)) {
new_hwmon_device = 0;
mutex_unlock(&thermal_list_lock);
goto register_sys_interface;
}
mutex_unlock(&thermal_list_lock);
hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
if (!hwmon)
return -ENOMEM;
INIT_LIST_HEAD(&hwmon->tz_list);
strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
hwmon->device = hwmon_device_register(NULL);
if (IS_ERR(hwmon->device)) {
result = PTR_ERR(hwmon->device);
goto free_mem;
}
hwmon->device->driver_data = hwmon;
result = device_create_file(hwmon->device, &dev_attr_name);
if (result)
goto unregister_hwmon_device;
register_sys_interface:
tz->hwmon = hwmon;
hwmon->count++;
snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
"temp%d_input", hwmon->count);
tz->temp_input.attr.attr.name = tz->temp_input.name;
tz->temp_input.attr.attr.mode = 0444;
tz->temp_input.attr.show = temp_input_show;
result = device_create_file(hwmon->device, &tz->temp_input.attr);
if (result)
goto unregister_hwmon_device;
if (tz->ops->get_crit_temp) {
unsigned long temperature;
if (!tz->ops->get_crit_temp(tz, &temperature)) {
snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
"temp%d_crit", hwmon->count);
tz->temp_crit.attr.attr.name = tz->temp_crit.name;
tz->temp_crit.attr.attr.mode = 0444;
tz->temp_crit.attr.show = temp_crit_show;
result = device_create_file(hwmon->device,
&tz->temp_crit.attr);
if (result)
goto unregister_hwmon_device;
}
}
mutex_lock(&thermal_list_lock);
if (new_hwmon_device)
list_add_tail(&hwmon->node, &thermal_hwmon_list);
list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
mutex_unlock(&thermal_list_lock);
return 0;
unregister_hwmon_device:
device_remove_file(hwmon->device, &tz->temp_crit.attr);
device_remove_file(hwmon->device, &tz->temp_input.attr);
if (new_hwmon_device) {
device_remove_file(hwmon->device, &dev_attr_name);
hwmon_device_unregister(hwmon->device);
}
free_mem:
if (new_hwmon_device)
kfree(hwmon);
return result;
}
static void
thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
{
struct thermal_hwmon_device *hwmon = tz->hwmon;
tz->hwmon = NULL;
device_remove_file(hwmon->device, &tz->temp_input.attr);
device_remove_file(hwmon->device, &tz->temp_crit.attr);
mutex_lock(&thermal_list_lock);
list_del(&tz->hwmon_node);
if (!list_empty(&hwmon->tz_list)) {
mutex_unlock(&thermal_list_lock);
return;
}
list_del(&hwmon->node);
mutex_unlock(&thermal_list_lock);
device_remove_file(hwmon->device, &dev_attr_name);
hwmon_device_unregister(hwmon->device);
kfree(hwmon);
}
#else
static int
thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
{
return 0;
}
static void
thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
{
}
#endif
/**
* thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
* @tz: thermal zone device
@ -642,6 +800,10 @@ struct thermal_zone_device *thermal_zone_device_register(char *type,
goto unregister;
}
result = thermal_add_hwmon_sysfs(tz);
if (result)
goto unregister;
mutex_lock(&thermal_list_lock);
list_add_tail(&tz->node, &thermal_tz_list);
if (ops->bind)
@ -700,6 +862,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
for (count = 0; count < tz->trips; count++)
TRIP_POINT_ATTR_REMOVE(&tz->device, count);
thermal_remove_hwmon_sysfs(tz);
release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
idr_destroy(&tz->idr);
mutex_destroy(&tz->lock);

View file

@ -66,6 +66,23 @@ struct thermal_cooling_device {
((long)t-2732+5)/10 : ((long)t-2732-5)/10)
#define CELSIUS_TO_KELVIN(t) ((t)*10+2732)
#if defined(CONFIG_HWMON) || \
(defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE))
/* thermal zone devices with the same type share one hwmon device */
struct thermal_hwmon_device {
char type[THERMAL_NAME_LENGTH];
struct device *device;
int count;
struct list_head tz_list;
struct list_head node;
};
struct thermal_hwmon_attr {
struct device_attribute attr;
char name[16];
};
#endif
struct thermal_zone_device {
int id;
char type[THERMAL_NAME_LENGTH];
@ -77,6 +94,13 @@ struct thermal_zone_device {
struct idr idr;
struct mutex lock; /* protect cooling devices list */
struct list_head node;
#if defined(CONFIG_HWMON) || \
(defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE))
struct list_head hwmon_node;
struct thermal_hwmon_device *hwmon;
struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */
#endif
};
struct thermal_zone_device *thermal_zone_device_register(char *, int, void *,