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From: Sascha Hauer <s.hauer@pengutronix.de>
To: linux-pm@vger.kernel.org
Cc: Zhang Rui <rui.zhang@intel.com>,
	Eduardo Valentin <edubezval@gmail.com>,
	linux-kernel@vger.kernel.org,
	Stephen Warren <swarren@wwwdotorg.org>,
	Mikko Perttunen <mikko.perttunen@kapsi.fi>,
	kernel@pengutronix.de, linux-mediatek@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	Brian Norris <computersforpeace@gmail.com>,
	Sascha Hauer <s.hauer@pengutronix.de>
Subject: [PATCH 12/13] thermal: thermal: Add support for hardware-tracked trip points
Date: Tue, 28 Apr 2015 10:26:02 +0200	[thread overview]
Message-ID: <1430209563-647-13-git-send-email-s.hauer@pengutronix.de> (raw)
In-Reply-To: <1430209563-647-1-git-send-email-s.hauer@pengutronix.de>

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 ULONG_MAX or 0 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>
---
 drivers/thermal/thermal_core.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/thermal.h        |  3 +++
 2 files changed, 45 insertions(+)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 420c702..4e1aaab 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -453,6 +453,45 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
 }
 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 
+static void thermal_zone_set_trips(struct thermal_zone_device *tz)
+{
+	int low = -INT_MAX;
+	int high = INT_MAX;
+	int trip_temp, hysteresis;
+	int temp = tz->temperature;
+	int i;
+
+	if (!tz->ops->set_trips)
+		return;
+
+	/* No need to change trip points */
+	if (temp > tz->prev_low_trip && temp < tz->prev_high_trip)
+		return;
+
+	for (i = 0; i < tz->trips; i++) {
+		unsigned long trip_low;
+
+		tz->ops->get_trip_temp(tz, i, &trip_temp);
+		tz->ops->get_trip_hyst(tz, i, &hysteresis);
+
+		trip_low = trip_temp - hysteresis;
+
+		if (trip_low < temp && trip_low > low)
+			low = trip_low;
+
+		if (trip_temp > temp && trip_temp < high)
+			high = trip_temp;
+	}
+
+	tz->prev_low_trip = low;
+	tz->prev_high_trip = high;
+
+	dev_dbg(&tz->device, "new temperature boundaries: %d < x < %d\n",
+			low, high);
+
+	tz->ops->set_trips(tz, low, high);
+}
+
 void thermal_zone_device_update(struct thermal_zone_device *tz)
 {
 	int temp, ret, count;
@@ -473,6 +512,7 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
 	mutex_lock(&tz->lock);
 	tz->last_temperature = tz->temperature;
 	tz->temperature = temp;
+	thermal_zone_set_trips(tz);
 	mutex_unlock(&tz->lock);
 
 	trace_thermal_temperature(tz);
@@ -1494,6 +1534,8 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
 	tz->trips = trips;
 	tz->passive_delay = passive_delay;
 	tz->polling_delay = polling_delay;
+	tz->prev_low_trip = INT_MAX;
+	tz->prev_high_trip = -INT_MAX;
 
 	dev_set_name(&tz->device, "thermal_zone%d", tz->id);
 	result = device_register(&tz->device);
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 07bd5e8..aef6e13 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -87,6 +87,7 @@ 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 *,
@@ -180,6 +181,8 @@ struct thermal_zone_device {
 	int last_temperature;
 	int emul_temperature;
 	int passive;
+	int prev_low_trip;
+	int prev_high_trip;
 	unsigned int forced_passive;
 	const struct thermal_zone_device_ops *ops;
 	const struct thermal_zone_params *tzp;
-- 
2.1.4


WARNING: multiple messages have this Message-ID
From: s.hauer@pengutronix.de (Sascha Hauer)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 12/13] thermal: thermal: Add support for hardware-tracked trip points
Date: Tue, 28 Apr 2015 10:26:02 +0200	[thread overview]
Message-ID: <1430209563-647-13-git-send-email-s.hauer@pengutronix.de> (raw)
In-Reply-To: <1430209563-647-1-git-send-email-s.hauer@pengutronix.de>

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 ULONG_MAX or 0 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>
---
 drivers/thermal/thermal_core.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/thermal.h        |  3 +++
 2 files changed, 45 insertions(+)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 420c702..4e1aaab 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -453,6 +453,45 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
 }
 EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
 
+static void thermal_zone_set_trips(struct thermal_zone_device *tz)
+{
+	int low = -INT_MAX;
+	int high = INT_MAX;
+	int trip_temp, hysteresis;
+	int temp = tz->temperature;
+	int i;
+
+	if (!tz->ops->set_trips)
+		return;
+
+	/* No need to change trip points */
+	if (temp > tz->prev_low_trip && temp < tz->prev_high_trip)
+		return;
+
+	for (i = 0; i < tz->trips; i++) {
+		unsigned long trip_low;
+
+		tz->ops->get_trip_temp(tz, i, &trip_temp);
+		tz->ops->get_trip_hyst(tz, i, &hysteresis);
+
+		trip_low = trip_temp - hysteresis;
+
+		if (trip_low < temp && trip_low > low)
+			low = trip_low;
+
+		if (trip_temp > temp && trip_temp < high)
+			high = trip_temp;
+	}
+
+	tz->prev_low_trip = low;
+	tz->prev_high_trip = high;
+
+	dev_dbg(&tz->device, "new temperature boundaries: %d < x < %d\n",
+			low, high);
+
+	tz->ops->set_trips(tz, low, high);
+}
+
 void thermal_zone_device_update(struct thermal_zone_device *tz)
 {
 	int temp, ret, count;
@@ -473,6 +512,7 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
 	mutex_lock(&tz->lock);
 	tz->last_temperature = tz->temperature;
 	tz->temperature = temp;
+	thermal_zone_set_trips(tz);
 	mutex_unlock(&tz->lock);
 
 	trace_thermal_temperature(tz);
@@ -1494,6 +1534,8 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
 	tz->trips = trips;
 	tz->passive_delay = passive_delay;
 	tz->polling_delay = polling_delay;
+	tz->prev_low_trip = INT_MAX;
+	tz->prev_high_trip = -INT_MAX;
 
 	dev_set_name(&tz->device, "thermal_zone%d", tz->id);
 	result = device_register(&tz->device);
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 07bd5e8..aef6e13 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -87,6 +87,7 @@ 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 *,
@@ -180,6 +181,8 @@ struct thermal_zone_device {
 	int last_temperature;
 	int emul_temperature;
 	int passive;
+	int prev_low_trip;
+	int prev_high_trip;
 	unsigned int forced_passive;
 	const struct thermal_zone_device_ops *ops;
 	const struct thermal_zone_params *tzp;
-- 
2.1.4

  parent reply	other threads:[~2015-04-28  8:26 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-28  8:25 [PATCH v2] Thermal cleanups and hardware " Sascha Hauer
2015-04-28  8:25 ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 01/13] thermal: consistently use int for temperatures Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 02/13] thermal: trivial: fix typo in comment Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 03/13] thermal: trivial: Add missing whitespace in message Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 04/13] thermal: remove useless call to thermal_zone_device_set_polling Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 05/13] thermal: Use IS_ENABLED instead of #ifdef Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 06/13] thermal: Add comment explaining test for critical temperature Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 07/13] thermal: inline only once used function Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 08/13] thermal: streamline get_trend callbacks Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:25 ` [PATCH 09/13] thermal: Allow sensor ops to fail with -ENOSYS Sascha Hauer
2015-04-28  8:25   ` Sascha Hauer
2015-04-28  8:26 ` [PATCH 10/13] thermal: of: always set sensor related callbacks Sascha Hauer
2015-04-28  8:26   ` Sascha Hauer
2015-04-28  8:26   ` Sascha Hauer
2015-04-28  8:26 ` [PATCH 11/13] thermal: Make struct thermal_zone_device_ops const Sascha Hauer
2015-04-28  8:26   ` Sascha Hauer
2015-04-28  8:26 ` Sascha Hauer [this message]
2015-04-28  8:26   ` [PATCH 12/13] thermal: thermal: Add support for hardware-tracked trip points Sascha Hauer
2015-04-28  8:26 ` [PATCH 13/13] thermal: of: implement .set_trips for device tree thermal zones Sascha Hauer
2015-04-28  8:26   ` Sascha Hauer

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