From 25a0a5ce16ecd7e60c4cf1436892433873e9d99d Mon Sep 17 00:00:00 2001 From: Ni Wade Date: Tue, 14 Jul 2015 15:40:56 +0800 Subject: [PATCH] thermal: add available policies sysfs attribute The Linux thermal framework support to change thermal governor policy in userspace, but it can't show what available policies supported. This patch adds available_policies attribute to the thermal framework, it can list the thermal governors which can be used for a particular zone. This attribute is read only. Signed-off-by: Wei Ni Reviewed-by: Javi Merino Signed-off-by: Zhang Rui --- Documentation/thermal/sysfs-api.txt | 6 ++++++ drivers/thermal/thermal_core.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+) diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt index c1f6864a8c5d..10f062ea6bc2 100644 --- a/Documentation/thermal/sysfs-api.txt +++ b/Documentation/thermal/sysfs-api.txt @@ -180,6 +180,7 @@ 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 thermal 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 @@ -256,6 +257,10 @@ policy One of the various thermal governors used for a particular zone. RW, Required +available_policies + Available 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 @@ -417,6 +422,7 @@ 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 04659bfb888b..c4700950e42e 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -847,6 +847,27 @@ 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; + ssize_t size = PAGE_SIZE; + + mutex_lock(&thermal_governor_lock); + + list_for_each_entry(pos, &thermal_governor_list, governor_list) { + size = PAGE_SIZE - count; + count += scnprintf(buf + count, size, "%s ", pos->name); + } + count += scnprintf(buf + count, size, "\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, @@ -1032,6 +1053,7 @@ 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) \ @@ -1817,6 +1839,11 @@ 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); @@ -1917,6 +1944,7 @@ 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); thermal_set_governor(tz, NULL); -- 2.20.1