linux-kernel - [PATCH 3/3] thermal: of: notify sensor driver on trip updates

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Date:	Wed, 26 Nov 2014 17:16:29 -0800
From:	Navneet Kumar <navneetk@...dia.com>
To:	<rui.zhang@...el.com>, <edubezval@...il.com>
CC:	<linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	navneet kumar <navneetk@...dia.com>
Subject: [PATCH 3/3] thermal: of: notify sensor driver on trip updates

From: navneet kumar <navneetk@...dia.com>

some thermal sensor hardwares include logic which
can raise interrupts at certain programmed temperature
thresholds.

Drivers for such sensors should be able to learn the
appropriate threshold temperatures for interrupts by querying
the thermal framework.

This change provides a mechanism to allow a sensor driver to
update it's thresholds when userspace changes a trip point
temperature.

While this behavior may not make sense in thermal zones
with more than one sensor, no such examples exist in
the kernel.

Signed-off-by: navneet kumar <navneetk@...dia.com>
---
 drivers/thermal/of-thermal.c | 7 +++++++
 include/linux/thermal.h      | 1 +
 2 files changed, 8 insertions(+)

diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
index 3d47a0cf3825..3568e4a586dc 100644
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -258,6 +258,9 @@ static int of_thermal_set_trip_temp(struct thermal_zone_device *tz, int trip,
 	/* thermal framework should take care of data->mask & (1 << trip) */
 	data->trips[trip].temperature = temp;
 
+	if (data->sops.trip_update)
+		data->sops.trip_update(data->sensor_data, trip);
+
 	return 0;
 }
 
@@ -285,6 +288,9 @@ static int of_thermal_set_trip_hyst(struct thermal_zone_device *tz, int trip,
 	/* thermal framework should take care of data->mask & (1 << trip) */
 	data->trips[trip].hysteresis = hyst;
 
+	if (data->sops.trip_update)
+		data->sops.trip_update(data->sensor_data, trip);
+
 	return 0;
 }
 
@@ -500,6 +506,7 @@ void thermal_zone_of_sensor_unregister(struct device *dev,
 
 	tz->sops.get_temp = NULL;
 	tz->sops.get_trend = NULL;
+	tz->sops.trip_update = NULL;
 	tz->sensor_data = NULL;
 	mutex_unlock(&tzd->lock);
 }
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 58341c56a01f..b93e65815175 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -292,6 +292,7 @@ struct thermal_genl_event {
 struct thermal_of_sensor_ops {
 	int (*get_temp)(void *, long *);
 	int (*get_trend)(void *, long *);
+	int (*trip_update)(void *, int);
 };
 
 /* Function declarations */
-- 
1.8.1.5

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