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authorJavi Merino <javi.merino@arm.com>2015-02-18 16:04:24 +0000
committerEduardo Valentin <edubezval@gmail.com>2015-05-04 21:27:51 -0700
commitdb91651311c8b89978b17d27634582c28c33363e (patch)
tree67786b4eb698a3f3712a83a87ad89a0c267c1627 /drivers/thermal
parent80b89172f9c3410764e0d962d6494c0af6d6dba8 (diff)
thermal: export weight to sysfs
It's useful to have access to the weights for the cooling devices for thermal zones and change them if needed. Export them to sysfs. Cc: Zhang Rui <rui.zhang@intel.com> Cc: Eduardo Valentin <edubezval@gmail.com> Signed-off-by: Javi Merino <javi.merino@arm.com> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/thermal_core.c40
-rw-r--r--drivers/thermal/thermal_core.h2
2 files changed, 42 insertions, 0 deletions
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index a6cb9b78b629..605d6919c1b6 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -922,6 +922,34 @@ static const struct attribute_group *cooling_device_attr_groups[] = {
NULL,
};
+static ssize_t
+thermal_cooling_device_weight_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct thermal_instance *instance;
+
+ instance = container_of(attr, struct thermal_instance, weight_attr);
+
+ return sprintf(buf, "%d\n", instance->weight);
+}
+
+static ssize_t
+thermal_cooling_device_weight_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct thermal_instance *instance;
+ int ret, weight;
+
+ ret = kstrtoint(buf, 0, &weight);
+ if (ret)
+ return ret;
+
+ instance = container_of(attr, struct thermal_instance, weight_attr);
+ instance->weight = weight;
+
+ return count;
+}
/* Device management */
/**
@@ -1016,6 +1044,16 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
if (result)
goto remove_symbol_link;
+ 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;
+ dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
+ dev->weight_attr.show = thermal_cooling_device_weight_show;
+ dev->weight_attr.store = thermal_cooling_device_weight_store;
+ result = device_create_file(&tz->device, &dev->weight_attr);
+ if (result)
+ goto remove_trip_file;
+
mutex_lock(&tz->lock);
mutex_lock(&cdev->lock);
list_for_each_entry(pos, &tz->thermal_instances, tz_node)
@@ -1033,6 +1071,8 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
if (!result)
return 0;
+ device_remove_file(&tz->device, &dev->weight_attr);
+remove_trip_file:
device_remove_file(&tz->device, &dev->attr);
remove_symbol_link:
sysfs_remove_link(&tz->device.kobj, dev->name);
diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h
index 7a465e9d456c..faebe881f062 100644
--- a/drivers/thermal/thermal_core.h
+++ b/drivers/thermal/thermal_core.h
@@ -46,6 +46,8 @@ struct thermal_instance {
unsigned long target; /* expected cooling state */
char attr_name[THERMAL_NAME_LENGTH];
struct device_attribute attr;
+ char weight_attr_name[THERMAL_NAME_LENGTH];
+ struct device_attribute weight_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 */