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authorDurgadoss R <durgadoss.r@intel.com>2012-09-18 09:34:57 +0400
committerZhang Rui <rui.zhang@intel.com>2012-11-05 10:00:05 +0400
commita4a15485fbba44d162d626141b9a7404e790f570 (patch)
tree1fdff11c9a771b879238f03eafec080fa193edf7 /drivers/thermal
parent50125a9b27dd09e9afdc1b8712ba0b3859886c68 (diff)
downloadlinux-a4a15485fbba44d162d626141b9a7404e790f570.tar.xz
Thermal: Add thermal governor registration APIs
This patch creates a structure to hold platform thermal governor information, and provides APIs for individual thermal governors to register/unregister with the Thermal framework. Signed-off-by: Durgadoss R <durgadoss.r@intel.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/thermal_sys.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index dca3bfc0e702..0afd84cb127d 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -49,7 +49,86 @@ static DEFINE_MUTEX(thermal_idr_lock);
static LIST_HEAD(thermal_tz_list);
static LIST_HEAD(thermal_cdev_list);
+static LIST_HEAD(thermal_governor_list);
+
static DEFINE_MUTEX(thermal_list_lock);
+static DEFINE_MUTEX(thermal_governor_lock);
+
+static struct thermal_governor *__find_governor(const char *name)
+{
+ struct thermal_governor *pos;
+
+ list_for_each_entry(pos, &thermal_governor_list, governor_list)
+ if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
+ return pos;
+
+ return NULL;
+}
+
+int thermal_register_governor(struct thermal_governor *governor)
+{
+ int err;
+ const char *name;
+ struct thermal_zone_device *pos;
+
+ if (!governor)
+ return -EINVAL;
+
+ mutex_lock(&thermal_governor_lock);
+
+ err = -EBUSY;
+ if (__find_governor(governor->name) == NULL) {
+ err = 0;
+ list_add(&governor->governor_list, &thermal_governor_list);
+ }
+
+ mutex_lock(&thermal_list_lock);
+
+ list_for_each_entry(pos, &thermal_tz_list, node) {
+ if (pos->governor)
+ continue;
+ if (pos->tzp)
+ name = pos->tzp->governor_name;
+ else
+ name = DEFAULT_THERMAL_GOVERNOR;
+ if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
+ pos->governor = governor;
+ }
+
+ mutex_unlock(&thermal_list_lock);
+ mutex_unlock(&thermal_governor_lock);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(thermal_register_governor);
+
+void thermal_unregister_governor(struct thermal_governor *governor)
+{
+ struct thermal_zone_device *pos;
+
+ if (!governor)
+ return;
+
+ mutex_lock(&thermal_governor_lock);
+
+ if (__find_governor(governor->name) == NULL)
+ goto exit;
+
+ mutex_lock(&thermal_list_lock);
+
+ list_for_each_entry(pos, &thermal_tz_list, node) {
+ if (!strnicmp(pos->governor->name, governor->name,
+ THERMAL_NAME_LENGTH))
+ pos->governor = NULL;
+ }
+
+ mutex_unlock(&thermal_list_lock);
+ list_del(&governor->governor_list);
+exit:
+ mutex_unlock(&thermal_governor_lock);
+ return;
+}
+EXPORT_SYMBOL_GPL(thermal_unregister_governor);
static int get_idr(struct idr *idr, struct mutex *lock, int *id)
{
@@ -1437,6 +1516,16 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
if (result)
goto unregister;
+ /* Update 'this' zone's governor information */
+ mutex_lock(&thermal_governor_lock);
+
+ if (tz->tzp)
+ tz->governor = __find_governor(tz->tzp->governor_name);
+ else
+ tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
+
+ mutex_unlock(&thermal_governor_lock);
+
result = thermal_add_hwmon_sysfs(tz);
if (result)
goto unregister;
@@ -1500,6 +1589,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
if (tz->ops->get_mode)
device_remove_file(&tz->device, &dev_attr_mode);
remove_trip_attrs(tz);
+ tz->governor = NULL;
thermal_remove_hwmon_sysfs(tz);
release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);