summaryrefslogtreecommitdiff
path: root/include/linux/thermal.h
diff options
context:
space:
mode:
authorSascha Hauer <s.hauer@pengutronix.de>2016-06-22 11:42:01 +0300
committerZhang Rui <rui.zhang@intel.com>2016-09-27 09:02:16 +0300
commit060c034a974187e930b790957cafc5047cc30a40 (patch)
tree0afdf73e38e94d0bd704ba40ae283ee088df6179 /include/linux/thermal.h
parent032d4057291e9d017cf50be017cf09b169ff438f (diff)
downloadlinux-060c034a974187e930b790957cafc5047cc30a40.tar.xz
thermal: Add support for hardware-tracked trip points
This adds support for hardware-tracked trip points to the device tree thermal sensor framework. The framework supports an arbitrary number of trip points. Whenever the current temperature is updated, the trip points immediately below and above the current temperature are found. A .set_trips callback is then called with the temperatures. If there is no trip point above or below the current temperature, the passed trip temperature will be -INT_MAX or INT_MAX respectively. In this callback, the driver should program the hardware such that it is notified when either of these trip points are triggered. When a trip point is triggered, the driver should call `thermal_zone_device_update' for the respective thermal zone. This will cause the trip points to be updated again. If .set_trips is not implemented, the framework behaves as before. This patch is based on an earlier version from Mikko Perttunen <mikko.perttunen@kapsi.fi> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Caesar Wang <wxt@rock-chips.com> Cc: Zhang Rui <rui.zhang@intel.com> Cc: Eduardo Valentin <edubezval@gmail.com> Cc: linux-pm@vger.kernel.org Reviewed-by: Javi Merino <javi.merino@arm.com> Signed-off-by: Eduardo Valentin <edubezval@gmail.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'include/linux/thermal.h')
-rw-r--r--include/linux/thermal.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 707d7353c28b..54cdfeaaedd4 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -98,6 +98,7 @@ struct thermal_zone_device_ops {
int (*unbind) (struct thermal_zone_device *,
struct thermal_cooling_device *);
int (*get_temp) (struct thermal_zone_device *, int *);
+ int (*set_trips) (struct thermal_zone_device *, int, int);
int (*get_mode) (struct thermal_zone_device *,
enum thermal_device_mode *);
int (*set_mode) (struct thermal_zone_device *,
@@ -168,6 +169,10 @@ struct thermal_attr {
* @last_temperature: previous temperature read
* @emul_temperature: emulated temperature when using CONFIG_THERMAL_EMULATION
* @passive: 1 if you've crossed a passive trip point, 0 otherwise.
+ * @prev_low_trip: the low current temperature if you've crossed a passive
+ trip point.
+ * @prev_high_trip: the above current temperature if you've crossed a
+ passive trip point.
* @forced_passive: If > 0, temperature at which to switch on all ACPI
* processor cooling devices. Currently only used by the
* step-wise governor.
@@ -199,6 +204,8 @@ struct thermal_zone_device {
int last_temperature;
int emul_temperature;
int passive;
+ int prev_low_trip;
+ int prev_high_trip;
unsigned int forced_passive;
atomic_t need_update;
struct thermal_zone_device_ops *ops;
@@ -426,6 +433,7 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
struct thermal_cooling_device *);
void thermal_zone_device_update(struct thermal_zone_device *);
+void thermal_zone_set_trips(struct thermal_zone_device *);
struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
const struct thermal_cooling_device_ops *);
@@ -477,6 +485,8 @@ static inline int thermal_zone_unbind_cooling_device(
{ return -ENODEV; }
static inline void thermal_zone_device_update(struct thermal_zone_device *tz)
{ }
+static inline void thermal_zone_set_trips(struct thermal_zone_device *tz)
+{ }
static inline struct thermal_cooling_device *
thermal_cooling_device_register(char *type, void *devdata,
const struct thermal_cooling_device_ops *ops)