Commit 5a2c090b authored by Durgadoss R's avatar Durgadoss R Committed by Zhang Rui

Thermal: Add a policy sysfs attribute

This patch adds a policy sysfs attribute to a thermal zone.
This attribute denotes the throttling governor used for the
zone. This is a RW attribute.
Signed-off-by: default avatarDurgadoss R <>
Signed-off-by: default avatarZhang Rui <>
parent a4a15485
......@@ -454,10 +454,41 @@ passive_show(struct device *dev, struct device_attribute *attr,
return sprintf(buf, "%d\n", tz->forced_passive);
static ssize_t
policy_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
int ret = -EINVAL;
struct thermal_zone_device *tz = to_thermal_zone(dev);
struct thermal_governor *gov;
gov = __find_governor(buf);
if (!gov)
goto exit;
tz->governor = gov;
ret = count;
return ret;
static ssize_t
policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
struct thermal_zone_device *tz = to_thermal_zone(dev);
return sprintf(buf, "%s\n", tz->governor->name);
static DEVICE_ATTR(type, 0444, type_show, NULL);
static DEVICE_ATTR(temp, 0444, temp_show, NULL);
static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
/* sys I/F for cooling device */
#define to_cooling_device(_dev) \
......@@ -1509,10 +1540,14 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
passive = 1;
if (!passive)
result = device_create_file(&tz->device,
if (!passive) {
result = device_create_file(&tz->device, &dev_attr_passive);
if (result)
goto unregister;
/* Create policy attribute */
result = device_create_file(&tz->device, &dev_attr_policy);
if (result)
goto unregister;
......@@ -1588,6 +1623,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
device_remove_file(&tz->device, &dev_attr_temp);
if (tz->ops->get_mode)
device_remove_file(&tz->device, &dev_attr_mode);
device_remove_file(&tz->device, &dev_attr_policy);
tz->governor = NULL;
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