Thermal: set upper and lower limits

set upper and lower limits when binding
a thermal cooling device to a thermal zone device.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: Eduardo Valentin <eduardo.valentin@ti.com>

1 files changed, 16 insertions, 7 deletions

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index d78c6dc6b00a..b04fe2c4b0d5 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -315,8 +315,9 @@ passive_store(struct device *dev, struct device_attribute *attr,
                         if (!strncmp("Processor", cdev->type,
                                      sizeof("Processor")))
                                 thermal_zone_bind_cooling_device(tz,
-                                                                 THERMAL_TRIPS_NONE,
-                                                                 cdev);
+                                                THERMAL_TRIPS_NONE, cdev,
+                                                THERMAL_NO_LIMIT,
+                                                THERMAL_NO_LIMIT);
                 }
                 mutex_unlock(&thermal_list_lock);
                 if (!tz->passive_delay)
@@ -801,7 +802,8 @@ static void thermal_zone_device_check(struct work_struct *work)
  */
 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
                                      int trip,
-                                     struct thermal_cooling_device *cdev)
+                                     struct thermal_cooling_device *cdev,
+                                     unsigned long upper, unsigned long lower)
 {
         struct thermal_cooling_device_instance *dev;
         struct thermal_cooling_device_instance *pos;
@@ -825,6 +827,15 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
         if (tz != pos1 || cdev != pos2)
                 return -EINVAL;
 
+        cdev->ops->get_max_state(cdev, &max_state);
+
+        /* lower default 0, upper default max_state */
+        lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
+        upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
+
+        if (lower > upper || upper > max_state)
+                return -EINVAL;
+
         dev =
             kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
         if (!dev)
@@ -832,10 +843,8 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
         dev->tz = tz;
         dev->cdev = cdev;
         dev->trip = trip;
-
-        cdev->ops->get_max_state(cdev, &max_state);
-        dev->upper = max_state;
-        dev->lower = 0;
+        dev->upper = upper;
+        dev->lower = lower;
 
         result = get_idr(&tz->idr, &tz->lock, &dev->id);
         if (result)