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authorJavi Merino <javi.merino@arm.com>2015-02-26 22:00:28 +0300
committerEduardo Valentin <edubezval@gmail.com>2015-05-05 07:27:52 +0300
commit35b11d2e3a66279a477e36cefb2603806295b8ce (patch)
tree36d287c5dd3aa876e0909408fe8a691b0fd189de /drivers/thermal
parente33df1d2f3a0141cd79e770f31999ba0dd7ebfa8 (diff)
downloadlinux-35b11d2e3a66279a477e36cefb2603806295b8ce.tar.xz
thermal: extend the cooling device API to include power information
Add three optional callbacks to the cooling device interface to allow them to express power. In addition to the callbacks, add helpers to identify cooling devices that implement the power cooling device API. Cc: Zhang Rui <rui.zhang@intel.com> Cc: Eduardo Valentin <edubezval@gmail.com> Signed-off-by: Javi Merino <javi.merino@arm.com> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/thermal_core.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index be62b1622ed3..263628b0e862 100644
--- 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);