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>

5 files changed, 65 insertions, 28 deletions

diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index c087dbcf353..ca1a1a34970 100644
--- a/Documentation/thermal/sysfs-api.txt
+++ b/Documentation/thermal/sysfs-api.txt
@@ -84,7 +84,8 @@ temperature) and throttle appropriate devices.
 
 1.3 interface for binding a thermal zone device with a thermal cooling device
 1.3.1 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
-                int trip, struct thermal_cooling_device *cdev);
+        int trip, struct thermal_cooling_device *cdev,
+        unsigned long upper, unsigned long lower);
 
     This interface function bind a thermal cooling device to the certain trip
     point of a thermal zone device.
@@ -93,6 +94,12 @@ temperature) and throttle appropriate devices.
     cdev: thermal cooling device
     trip: indicates which trip point the cooling devices is associated with
           in this thermal zone.
+    upper:the Maximum cooling state for this trip point.
+          THERMAL_NO_LIMIT means no upper limit,
+          and the cooling device can be in max_state.
+    lower:the Minimum cooling state can be used for this trip point.
+          THERMAL_NO_LIMIT means no lower limit,
+          and the cooling device can be in cooling state 0.
 
 1.3.2 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
                 int trip, struct thermal_cooling_device *cdev);
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 9fe90e9fecb..d7ef69d835f 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 39abb150bdd..a207466f4ba 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 d78c6dc6b00..b04fe2c4b0d 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)
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 4b94a61955d..5946a3b90bb 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -75,6 +75,8 @@ struct thermal_cooling_device_ops {
         int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
 };
 
+#define THERMAL_NO_LIMIT -1UL /* no upper/lower limit requirement */
+
 #define THERMAL_TRIPS_NONE -1
 #define THERMAL_MAX_TRIPS 12
 #define THERMAL_NAME_LENGTH 20
@@ -157,7 +159,8 @@ struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
 void thermal_zone_device_unregister(struct thermal_zone_device *);
 
 int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
-                                     struct thermal_cooling_device *);
+                                     struct thermal_cooling_device *,
+                                     unsigned long, unsigned long);
 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
                                        struct thermal_cooling_device *);
 void thermal_zone_device_update(struct thermal_zone_device *);