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| author | Ni Wade <wni@nvidia.com> | 2015-07-14 15:40:56 +0800 |
|---|---|---|
| committer | Zhang Rui <rui.zhang@intel.com> | 2015-08-03 23:15:50 +0800 |
| commit | 25a0a5ce16ecd7e60c4cf1436892433873e9d99d (patch) | |
| tree | 4debaeb56d0784c137b0b91afb5cfd9b7da41bc6 /drivers/thermal | |
| parent | 74d33293e467df61de1b1d8b2fbe29e550dec33b (diff) | |
| download | linux-25a0a5ce16ecd7e60c4cf1436892433873e9d99d.tar.bz2 | |
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 <wni@nvidia.com>
Reviewed-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'drivers/thermal')
| -rw-r--r-- | drivers/thermal/thermal_core.c | 28 |
1 files changed, 28 insertions, 0 deletions
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); |