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>

3 files changed, 53 insertions, 26 deletions

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 9fe90e9fecb5..d7ef69d835f2 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -729,11 +729,9 @@ static int thermal_notify(struct thermal_zone_device *thermal, int trip,
 	return 0;
 }
 
-typedef int (*cb)(struct thermal_zone_device *, int,
-		  struct thermal_cooling_device *);
 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 					struct thermal_cooling_device *cdev,
-					cb action)
+					bool bind)
 {
 	struct acpi_device *device = cdev->devdata;
 	struct acpi_thermal *tz = thermal->devdata;
@@ -757,11 +755,19 @@ static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 		    i++) {
 			handle = tz->trips.passive.devices.handles[i];
 			status = acpi_bus_get_device(handle, &dev);
-			if (ACPI_SUCCESS(status) && (dev == device)) {
-				result = action(thermal, trip, cdev);
-				if (result)
-					goto failed;
-			}
+			if (ACPI_FAILURE(status) || dev != device)
+				continue;
+			if (bind)
+				result =
+					thermal_zone_bind_cooling_device
+					(thermal, trip, cdev,
+					 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
+			else
+				result =
+					thermal_zone_unbind_cooling_device
+					(thermal, trip, cdev);
+			if (result)
+				goto failed;
 		}
 	}
 
@@ -774,11 +780,17 @@ static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 		    j++) {
 			handle = tz->trips.active[i].devices.handles[j];
 			status = acpi_bus_get_device(handle, &dev);
-			if (ACPI_SUCCESS(status) && (dev == device)) {
-				result = action(thermal, trip, cdev);
-				if (result)
-					goto failed;
-			}
+			if (ACPI_FAILURE(status) || dev != device)
+				continue;
+			if (bind)
+				result = thermal_zone_bind_cooling_device
+					(thermal, trip, cdev,
+					 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
+			else
+				result = thermal_zone_unbind_cooling_device
+					(thermal, trip, cdev);
+			if (result)
+				goto failed;
 		}
 	}
 
@@ -786,7 +798,14 @@ static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
 		handle = tz->devices.handles[i];
 		status = acpi_bus_get_device(handle, &dev);
 		if (ACPI_SUCCESS(status) && (dev == device)) {
-			result = action(thermal, -1, cdev);
+			if (bind)
+				result = thermal_zone_bind_cooling_device
+						(thermal, -1, cdev,
+						 THERMAL_NO_LIMIT,
+						 THERMAL_NO_LIMIT);
+			else
+				result = thermal_zone_unbind_cooling_device
+						(thermal, -1, cdev);
 			if (result)
 				goto failed;
 		}
@@ -800,16 +819,14 @@ static int
 acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
 					struct thermal_cooling_device *cdev)
 {
-	return acpi_thermal_cooling_device_cb(thermal, cdev,
-				thermal_zone_bind_cooling_device);
+	return acpi_thermal_cooling_device_cb(thermal, cdev, true);
 }
 
 static int
 acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
 					struct thermal_cooling_device *cdev)
 {
-	return acpi_thermal_cooling_device_cb(thermal, cdev,
-				thermal_zone_unbind_cooling_device);
+	return acpi_thermal_cooling_device_cb(thermal, cdev, false);
 }
 
 static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
index 39abb150bdd4..a207466f4ba8 100644
--- a/drivers/platform/x86/acerhdf.c
+++ b/drivers/platform/x86/acerhdf.c
@@ -329,7 +329,8 @@ static int acerhdf_bind(struct thermal_zone_device *thermal,
 	if (cdev != cl_dev)
 		return 0;
 
-	if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) {
+	if (thermal_zone_bind_cooling_device(thermal, 0, cdev,
+			THERMAL_NO_LIMIT, THERMAL_NO_LIMIT)) {
 		pr_err("error binding cooling dev\n");
 		return -EINVAL;
 	}
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)