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Thermal: Add a policy sysfs attribute

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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: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
Durgadoss R 2012-09-18 11:04:58 +05:30 committed by Zhang Rui
parent a4a15485fb
commit 5a2c090b33
1 changed files with 39 additions and 3 deletions
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42
drivers/thermal/thermal_sys.c
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@ -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;
mutex_lock(&thermal_governor_lock);
gov = __find_governor(buf);
if (!gov)
goto exit;
tz->governor = gov;
ret = count;
exit:
mutex_unlock(&thermal_governor_lock);
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,
&dev_attr_passive);
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);
remove_trip_attrs(tz);
tz->governor = NULL;