diff options
| -rw-r--r-- | drivers/thermal/thermal.c | 163 | ||||
| -rw-r--r-- | include/linux/thermal.h | 24 |
2 files changed, 187 insertions, 0 deletions
diff --git a/drivers/thermal/thermal.c b/drivers/thermal/thermal.c index cf56af4b7e02..6098787341f3 100644 --- a/drivers/thermal/thermal.c +++ b/drivers/thermal/thermal.c @@ -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); diff --git a/include/linux/thermal.h b/include/linux/thermal.h index 16e6a8bdeb3c..06d3e6eb9ca8 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -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 *, |