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Commit 5a2c090b authored by Durgadoss R's avatar Durgadoss R Committed by Zhang Rui
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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 <durgadoss.r@intel.com>
Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
parent a4a15485

drivers/thermal/thermal_sys.c

+39 −3
Original line number Diff line number Diff line
@@ -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;