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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
Len Brown
parent
9ec732ff80
commit
e68b16abd9
@ -295,6 +295,164 @@ thermal_cooling_device_trip_point_show(struct device *dev,
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/* Device management */
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#if defined(CONFIG_HWMON) || \
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(defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE))
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/* hwmon sys I/F */
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#include <linux/hwmon.h>
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static LIST_HEAD(thermal_hwmon_list);
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static ssize_t
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name_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct thermal_hwmon_device *hwmon = dev->driver_data;
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return sprintf(buf, "%s\n", hwmon->type);
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}
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static DEVICE_ATTR(name, 0444, name_show, NULL);
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static ssize_t
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temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct thermal_hwmon_attr *hwmon_attr
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= container_of(attr, struct thermal_hwmon_attr, attr);
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struct thermal_zone_device *tz
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= container_of(hwmon_attr, struct thermal_zone_device,
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temp_input);
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return tz->ops->get_temp(tz, buf);
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}
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static ssize_t
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temp_crit_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct thermal_hwmon_attr *hwmon_attr
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= container_of(attr, struct thermal_hwmon_attr, attr);
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struct thermal_zone_device *tz
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= container_of(hwmon_attr, struct thermal_zone_device,
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temp_crit);
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return tz->ops->get_trip_temp(tz, 0, buf);
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}
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static int
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thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
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{
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struct thermal_hwmon_device *hwmon;
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int new_hwmon_device = 1;
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int result;
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mutex_lock(&thermal_list_lock);
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list_for_each_entry(hwmon, &thermal_hwmon_list, node)
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if (!strcmp(hwmon->type, tz->type)) {
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new_hwmon_device = 0;
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mutex_unlock(&thermal_list_lock);
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goto register_sys_interface;
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}
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mutex_unlock(&thermal_list_lock);
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hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
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if (!hwmon)
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return -ENOMEM;
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INIT_LIST_HEAD(&hwmon->tz_list);
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strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
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hwmon->device = hwmon_device_register(NULL);
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if (IS_ERR(hwmon->device)) {
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result = PTR_ERR(hwmon->device);
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goto free_mem;
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}
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hwmon->device->driver_data = hwmon;
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result = device_create_file(hwmon->device, &dev_attr_name);
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if (result)
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goto unregister_hwmon_device;
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register_sys_interface:
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tz->hwmon = hwmon;
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hwmon->count++;
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snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
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"temp%d_input", hwmon->count);
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tz->temp_input.attr.attr.name = tz->temp_input.name;
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tz->temp_input.attr.attr.mode = 0444;
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tz->temp_input.attr.show = temp_input_show;
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result = device_create_file(hwmon->device, &tz->temp_input.attr);
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if (result)
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goto unregister_hwmon_device;
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if (tz->ops->get_crit_temp) {
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unsigned long temperature;
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if (!tz->ops->get_crit_temp(tz, &temperature)) {
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snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
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"temp%d_crit", hwmon->count);
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tz->temp_crit.attr.attr.name = tz->temp_crit.name;
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tz->temp_crit.attr.attr.mode = 0444;
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tz->temp_crit.attr.show = temp_crit_show;
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result = device_create_file(hwmon->device,
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&tz->temp_crit.attr);
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if (result)
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goto unregister_hwmon_device;
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}
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}
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mutex_lock(&thermal_list_lock);
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if (new_hwmon_device)
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list_add_tail(&hwmon->node, &thermal_hwmon_list);
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list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
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mutex_unlock(&thermal_list_lock);
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return 0;
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unregister_hwmon_device:
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device_remove_file(hwmon->device, &tz->temp_crit.attr);
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device_remove_file(hwmon->device, &tz->temp_input.attr);
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if (new_hwmon_device) {
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device_remove_file(hwmon->device, &dev_attr_name);
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hwmon_device_unregister(hwmon->device);
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}
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free_mem:
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if (new_hwmon_device)
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kfree(hwmon);
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return result;
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}
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static void
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thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
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{
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struct thermal_hwmon_device *hwmon = tz->hwmon;
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tz->hwmon = NULL;
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device_remove_file(hwmon->device, &tz->temp_input.attr);
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device_remove_file(hwmon->device, &tz->temp_crit.attr);
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mutex_lock(&thermal_list_lock);
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list_del(&tz->hwmon_node);
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if (!list_empty(&hwmon->tz_list)) {
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mutex_unlock(&thermal_list_lock);
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return;
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}
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list_del(&hwmon->node);
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mutex_unlock(&thermal_list_lock);
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device_remove_file(hwmon->device, &dev_attr_name);
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hwmon_device_unregister(hwmon->device);
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kfree(hwmon);
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}
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#else
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static int
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thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
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{
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return 0;
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}
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static void
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thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
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{
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}
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#endif
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/**
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* thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
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* @tz: thermal zone device
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@ -642,6 +800,10 @@ struct thermal_zone_device *thermal_zone_device_register(char *type,
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goto unregister;
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}
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result = thermal_add_hwmon_sysfs(tz);
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if (result)
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goto unregister;
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mutex_lock(&thermal_list_lock);
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list_add_tail(&tz->node, &thermal_tz_list);
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if (ops->bind)
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@ -700,6 +862,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
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for (count = 0; count < tz->trips; count++)
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TRIP_POINT_ATTR_REMOVE(&tz->device, count);
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thermal_remove_hwmon_sysfs(tz);
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release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
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idr_destroy(&tz->idr);
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mutex_destroy(&tz->lock);
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@ -66,6 +66,23 @@ struct thermal_cooling_device {
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((long)t-2732+5)/10 : ((long)t-2732-5)/10)
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#define CELSIUS_TO_KELVIN(t) ((t)*10+2732)
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#if defined(CONFIG_HWMON) || \
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(defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE))
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/* thermal zone devices with the same type share one hwmon device */
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struct thermal_hwmon_device {
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char type[THERMAL_NAME_LENGTH];
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struct device *device;
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int count;
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struct list_head tz_list;
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struct list_head node;
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};
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struct thermal_hwmon_attr {
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struct device_attribute attr;
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char name[16];
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};
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#endif
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struct thermal_zone_device {
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int id;
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char type[THERMAL_NAME_LENGTH];
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@ -77,6 +94,13 @@ struct thermal_zone_device {
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struct idr idr;
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struct mutex lock; /* protect cooling devices list */
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struct list_head node;
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#if defined(CONFIG_HWMON) || \
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(defined(CONFIG_HWMON_MODULE) && defined(CONFIG_THERMAL_MODULE))
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struct list_head hwmon_node;
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struct thermal_hwmon_device *hwmon;
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struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
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struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */
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#endif
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};
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struct thermal_zone_device *thermal_zone_device_register(char *, int, void *,
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