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Commit a66af145 authored by Ram Chandrasekar's avatar Ram Chandrasekar
Browse files

drivers: thermal: Add attributes to show the cdev limits 



At the moment, there is no method for the userspace to know the operating
upper and lower limit for a cooling device associated with a trip.

Add new sysfs attributes cdev#_upper_limit and cdev#_lower_limit to
display the operating upper and lower limit of the cooling device.

Change-Id: Ifda1c51f8ebaf071552d454a4f1b6d07f4e9d005
Signed-off-by: default avatarRam Chandrasekar <rkumbako@codeaurora.org>
parent 5b1c0d10

drivers/thermal/thermal_core.c

+51 −1
Original line number Diff line number Diff line
@@ -1289,6 +1289,30 @@ static DEVICE_ATTR(min_state, 0644, 
		   thermal_cooling_device_min_state_show,

		   thermal_cooling_device_min_state_store);



static ssize_t

thermal_cooling_device_lower_limit_show(struct device *dev,

				       struct device_attribute *attr, char *buf)

{

	struct thermal_instance *instance;



	instance =

	    container_of(attr, struct thermal_instance, lower_attr);



	return snprintf(buf, PAGE_SIZE, "%lu\n", instance->lower);

}



static ssize_t

thermal_cooling_device_upper_limit_show(struct device *dev,

				       struct device_attribute *attr, char *buf)

{

	struct thermal_instance *instance;



	instance =

	    container_of(attr, struct thermal_instance, upper_attr);



	return snprintf(buf, PAGE_SIZE, "%lu\n", instance->upper);

}



static ssize_t

thermal_cooling_device_trip_point_show(struct device *dev,

				       struct device_attribute *attr, char *buf)
@@ -1443,6 +1467,26 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, 
	if (result)

		goto remove_symbol_link;



	snprintf(dev->upper_attr_name, THERMAL_NAME_LENGTH,

			"cdev%d_upper_limit", dev->id);

	sysfs_attr_init(&dev->upper_attr.attr);

	dev->upper_attr.attr.name = dev->upper_attr_name;

	dev->upper_attr.attr.mode = 0444;

	dev->upper_attr.show = thermal_cooling_device_upper_limit_show;

	result = device_create_file(&tz->device, &dev->upper_attr);

	if (result)

		goto remove_trip_file;



	snprintf(dev->lower_attr_name, THERMAL_NAME_LENGTH,

			"cdev%d_lower_limit", dev->id);

	sysfs_attr_init(&dev->lower_attr.attr);

	dev->lower_attr.attr.name = dev->lower_attr_name;

	dev->lower_attr.attr.mode = 0444;

	dev->lower_attr.show = thermal_cooling_device_lower_limit_show;

	result = device_create_file(&tz->device, &dev->lower_attr);

	if (result)

		goto remove_upper_file;



	sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);

	sysfs_attr_init(&dev->weight_attr.attr);

	dev->weight_attr.attr.name = dev->weight_attr_name;
@@ -1451,7 +1495,7 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, 
	dev->weight_attr.store = thermal_cooling_device_weight_store;

	result = device_create_file(&tz->device, &dev->weight_attr);

	if (result)

		goto remove_trip_file;

		goto remove_lower_file;



	mutex_lock(&tz->lock);

	mutex_lock(&cdev->lock);
@@ -1472,6 +1516,10 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, 
		return 0;



	device_remove_file(&tz->device, &dev->weight_attr);

remove_lower_file:

	device_remove_file(&tz->device, &dev->lower_attr);

remove_upper_file:

	device_remove_file(&tz->device, &dev->upper_attr);

remove_trip_file:

	device_remove_file(&tz->device, &dev->attr);

remove_symbol_link:
@@ -1521,6 +1569,8 @@ int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz, 
	return -ENODEV;



unbind:

	device_remove_file(&tz->device, &pos->lower_attr);

	device_remove_file(&tz->device, &pos->upper_attr);

	device_remove_file(&tz->device, &pos->weight_attr);

	device_remove_file(&tz->device, &pos->attr);

	sysfs_remove_link(&tz->device.kobj, pos->name);

drivers/thermal/thermal_core.h

+4 −0
Original line number Diff line number Diff line
@@ -49,6 +49,10 @@ struct thermal_instance { 
	struct device_attribute attr;

	char weight_attr_name[THERMAL_NAME_LENGTH];

	struct device_attribute weight_attr;

	char upper_attr_name[THERMAL_NAME_LENGTH];

	struct device_attribute upper_attr;

	char lower_attr_name[THERMAL_NAME_LENGTH];

	struct device_attribute lower_attr;

	struct list_head tz_node; /* node in tz->thermal_instances */

	struct list_head cdev_node; /* node in cdev->thermal_instances */

	unsigned int weight; /* The weight of the cooling device */