thermal: extend the cooling device API to include power information

[deliverable/linux.git] / drivers / thermal / thermal_core.c

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index be62b1622ed320938e867fa219123bb88057c0e1..263628b0e862ab8f211075c87f256d61209cb3a7 100644 (file)
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -875,6 +875,58 @@ emul_temp_store(struct device *dev, struct device_attribute *attr,
 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 #endif/*CONFIG_THERMAL_EMULATION*/
 
+/**
+ * power_actor_get_max_power() - get the maximum power that a cdev can consume
+ * @cdev:      pointer to &thermal_cooling_device
+ * @tz:                a valid thermal zone device pointer
+ * @max_power: pointer in which to store the maximum power
+ *
+ * Calculate the maximum power consumption in milliwats that the
+ * cooling device can currently consume and store it in @max_power.
+ *
+ * Return: 0 on success, -EINVAL if @cdev doesn't support the
+ * power_actor API or -E* on other error.
+ */
+int power_actor_get_max_power(struct thermal_cooling_device *cdev,
+                             struct thermal_zone_device *tz, u32 *max_power)
+{
+       if (!cdev_is_power_actor(cdev))
+               return -EINVAL;
+
+       return cdev->ops->state2power(cdev, tz, 0, max_power);
+}
+
+/**
+ * power_actor_set_power() - limit the maximum power that a cooling device can consume
+ * @cdev:      pointer to &thermal_cooling_device
+ * @instance:  thermal instance to update
+ * @power:     the power in milliwatts
+ *
+ * Set the cooling device to consume at most @power milliwatts.
+ *
+ * Return: 0 on success, -EINVAL if the cooling device does not
+ * implement the power actor API or -E* for other failures.
+ */
+int power_actor_set_power(struct thermal_cooling_device *cdev,
+                         struct thermal_instance *instance, u32 power)
+{
+       unsigned long state;
+       int ret;
+
+       if (!cdev_is_power_actor(cdev))
+               return -EINVAL;
+
+       ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
+       if (ret)
+               return ret;
+
+       instance->target = state;
+       cdev->updated = false;
+       thermal_cdev_update(cdev);
+
+       return 0;
+}
+
 static DEVICE_ATTR(type, 0444, type_show, NULL);
 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);