The Linux thermal framework support to change governor policy
in run time, but it can't show what available policies supported.
This patch adds available_policies attribut to the thermal
framework, it can list the thermal governors which can be
used for a particular zone. This attribut is read only.
Signed-off-by: Wei Ni <wni@xxxxxxxxxx>
---
Documentation/thermal/sysfs-api.txt | 6 ++++++
drivers/thermal/thermal_core.c | 25 +++++++++++++++++++++++++
2 files changed, 31 insertions(+)
diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index 87519cb..6a70b55c 100644
--- a/Documentation/thermal/sysfs-api.txt
+++ b/Documentation/thermal/sysfs-api.txt
@@ -172,6 +172,7 @@ Thermal zone device sys I/F, created once it's registered:
|---temp: Current temperature
|---mode: Working mode of the thermal zone
|---policy: Thermal governor used for this zone
+ |---available_policies Available governors for this zone
|---trip_point_[0-*]_temp: Trip point temperature
|---trip_point_[0-*]_type: Trip point type
|---trip_point_[0-*]_hyst: Hysteresis value for this trip point
@@ -238,6 +239,10 @@ policy
One of the various thermal governors used for a particular zone.
RW, Required
+available_policies
+ Availabe thermal governors which can be used for a particular zone.
+ RO, Required
+
trip_point_[0-*]_temp
The temperature above which trip point will be fired.
Unit: millidegree Celsius
@@ -330,6 +335,7 @@ method, the sys I/F structure will be built like this:
|---temp: 37000
|---mode: enabled
|---policy: step_wise
+ |---available_policies: step_wise fair_share
|---trip_point_0_temp: 100000
|---trip_point_0_type: critical
|---trip_point_1_temp: 80000
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 338a88b..aab1df8 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -761,6 +761,24 @@ policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
return sprintf(buf, "%s\n", tz->governor->name);
}
+static ssize_t
+available_policies_show(struct device *dev, struct device_attribute *devattr,
+ char *buf)
+{
+ struct thermal_governor *pos;
+ ssize_t count = 0;
+
+ mutex_lock(&thermal_governor_lock);
+
+ list_for_each_entry(pos, &thermal_governor_list, governor_list)
+ count += sprintf(buf + count, "%s ", pos->name);
+ count += sprintf(buf + count, "\n");
+
+ mutex_unlock(&thermal_governor_lock);
+
+ return count;
+}
+
#ifdef CONFIG_THERMAL_EMULATION
static ssize_t
emul_temp_store(struct device *dev, struct device_attribute *attr,
@@ -794,6 +812,7 @@ 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);
+static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
/* sys I/F for cooling device */
#define to_cooling_device(_dev) \
@@ -1527,6 +1546,11 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
if (result)
goto unregister;
+ /* Create available_policies attribute */
+ result = device_create_file(&tz->device, &dev_attr_available_policies);
+ if (result)
+ goto unregister;
+
/* Update 'this' zone's governor information */
mutex_lock(&thermal_governor_lock);
@@ -1622,6 +1646,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
if (tz->ops->get_mode)
device_remove_file(&tz->device, &dev_attr_mode);
device_remove_file(&tz->device, &dev_attr_policy);
+ device_remove_file(&tz->device, &dev_attr_available_policies);
remove_trip_attrs(tz);
tz->governor = NULL;
--
1.7.9.5
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