Commit d7203eed authored by Daniel Lezcano's avatar Daniel Lezcano
Browse files

thermal/core: Add critical and hot ops 



Currently there is no way to the sensors to directly call an ops in
interrupt mode without calling thermal_zone_device_update assuming all
the trip points are defined.

A sensor may want to do something special if a trip point is hot or
critical.

This patch adds the critical and hot ops to the thermal zone device,
so a sensor can directly invoke them or let the thermal framework to
call the sensor specific ones.

Tested-by: default avatarKai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: default avatarLukasz Luba <lukasz.luba@arm.com>
Link: https://lore.kernel.org/r/20201210121514.25760-2-daniel.lezcano@linaro.org
parent 433178e7

drivers/thermal/thermal_core.c

+27 −16
Original line number Diff line number Diff line
@@ -380,6 +380,25 @@ static void thermal_emergency_poweroff(void) 
			      msecs_to_jiffies(poweroff_delay_ms));

}



void thermal_zone_device_critical(struct thermal_zone_device *tz)

{

	dev_emerg(&tz->device, "%s: critical temperature reached, "

		  "shutting down\n", tz->type);



	mutex_lock(&poweroff_lock);

	if (!power_off_triggered) {

		/*

		 * Queue a backup emergency shutdown in the event of

		 * orderly_poweroff failure

		 */

		thermal_emergency_poweroff();

		orderly_poweroff(true);

		power_off_triggered = true;

	}

	mutex_unlock(&poweroff_lock);

}

EXPORT_SYMBOL(thermal_zone_device_critical);



static void handle_critical_trips(struct thermal_zone_device *tz,

				  int trip, enum thermal_trip_type trip_type)

{
@@ -396,22 +415,10 @@ static void handle_critical_trips(struct thermal_zone_device *tz, 
	if (tz->ops->notify)

		tz->ops->notify(tz, trip, trip_type);



	if (trip_type == THERMAL_TRIP_CRITICAL) {

		dev_emerg(&tz->device,

			  "critical temperature reached (%d C), shutting down\n",

			  tz->temperature / 1000);

		mutex_lock(&poweroff_lock);

		if (!power_off_triggered) {

			/*

			 * Queue a backup emergency shutdown in the event of

			 * orderly_poweroff failure

			 */

			thermal_emergency_poweroff();

			orderly_poweroff(true);

			power_off_triggered = true;

		}

		mutex_unlock(&poweroff_lock);

	}

	if (trip_type == THERMAL_TRIP_HOT && tz->ops->hot)

		tz->ops->hot(tz);

	else if (trip_type == THERMAL_TRIP_CRITICAL)

		tz->ops->critical(tz);

}



static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
@@ -1336,6 +1343,10 @@ thermal_zone_device_register(const char *type, int trips, int mask, 


	tz->id = id;

	strlcpy(tz->type, type, sizeof(tz->type));



	if (!ops->critical)

		ops->critical = thermal_zone_device_critical;



	tz->ops = ops;

	tz->tzp = tzp;

	tz->device.class = &thermal_class;

include/linux/thermal.h

+3 −0
Original line number Diff line number Diff line
@@ -79,6 +79,8 @@ struct thermal_zone_device_ops { 
			  enum thermal_trend *);

	int (*notify) (struct thermal_zone_device *, int,

		       enum thermal_trip_type);

	void (*hot)(struct thermal_zone_device *);

	void (*critical)(struct thermal_zone_device *);

};



struct thermal_cooling_device_ops {
@@ -399,6 +401,7 @@ void thermal_cdev_update(struct thermal_cooling_device *); 
void thermal_notify_framework(struct thermal_zone_device *, int);

int thermal_zone_device_enable(struct thermal_zone_device *tz);

int thermal_zone_device_disable(struct thermal_zone_device *tz);

void thermal_zone_device_critical(struct thermal_zone_device *tz);

#else

static inline struct thermal_zone_device *thermal_zone_device_register(

	const char *type, int trips, int mask, void *devdata,

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