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Thermal: Introduce multiple cooling states support 

This is because general active cooling devices, like fans,
may have multiple speeds, which can be mapped to different cooling states.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: Valentin, Eduardo <eduardo.valentin@ti.com>
This commit is contained in:
Zhang Rui 2012-06-26 16:26:40 +08:00
parent 0d7614f09c
commit e3f25e6e58
1 changed files with 10 additions and 2 deletions
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12
drivers/thermal/thermal_sys.c
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@ -1059,6 +1059,7 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
enum thermal_trip_type trip_type;
struct thermal_cooling_device_instance *instance;
struct thermal_cooling_device *cdev;
unsigned long cur_state, max_state;
mutex_lock(&tz->lock);
@ -1098,10 +1099,17 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
cdev = instance->cdev;
cdev->ops->get_cur_state(cdev, &cur_state);
cdev->ops->get_max_state(cdev, &max_state);
if (temp >= trip_temp)
cdev->ops->set_cur_state(cdev, 1);
cur_state = cur_state < max_state ?
(cur_state + 1) : max_state;
else
cdev->ops->set_cur_state(cdev, 0);
cur_state = cur_state > 0 ?
(cur_state - 1) : 0;
cdev->ops->set_cur_state(cdev, cur_state);
}
break;
case THERMAL_TRIP_PASSIVE: