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Date: Tue, 8 May 2018 11:48:59 -0600
From: Lina Iyer <ilina@...eaurora.org>
To: edubezval@...il.com, rui.zhang@...el.com
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org, daniel.lezcano@...aro.org,
amit.kucheria@...aro.org, Lina Iyer <ilina@...eaurora.org>
Subject: [PATCH RFC 4/4] drivers: of-thermal: notify framework when sensor is tripped
Notify all related thermal zones when the sensor reports a thermal trip.
Signed-off-by: Lina Iyer <ilina@...eaurora.org>
---
drivers/thermal/of-thermal.c | 83 ++++++++++++++++++++++++++++++++++--
include/linux/thermal.h | 4 ++
2 files changed, 84 insertions(+), 3 deletions(-)
diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
index 6fb2eeb5b6cf..9b42bfed78bf 100644
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -41,12 +41,18 @@ struct __thermal_bind_params {
* @ops: sensor driver ops
* @tz_list: list of thermal zones for this sensor
* @lock: lock sensor during operations
+ * @low_trip: sensor's low trip temp
+ * @high_trip: sensor's high trip temp
+ * @low_tz: the thermal zone whose low trip is used as @low_trip
+ * @high_tz: the thermal zone whose high trip is used as @high_trip
*/
struct thermal_sensor {
void *sensor_data;
const struct thermal_zone_of_device_ops *ops;
struct list_head tz_list;
struct mutex lock;
+ int low_trip, high_trip;
+ struct thermal_zone_device *low_tz, *high_tz;
};
/**
@@ -102,18 +108,26 @@ static void __of_thermal_agg_trip(struct thermal_sensor *sensor,
int low, high;
int max_lo = INT_MIN;
int min_hi = INT_MAX;
- struct thermal_zone_device *tz;
+ struct thermal_zone_device *tz, *lo_tz = NULL, *hi_tz = NULL;
list_for_each_entry(tz, &sensor->tz_list, sensor_tzd) {
thermal_zone_get_trip(tz, &low, &high);
- if (low > max_lo)
+ if (low > max_lo) {
max_lo = low;
- if (high < min_hi)
+ lo_tz = tz;
+ }
+ if (high < min_hi) {
min_hi = high;
+ hi_tz = tz;
+ }
}
*floor = max_lo;
*ceil = min_hi;
+ sensor->low_trip = max_lo;
+ sensor->high_trip = min_hi;
+ sensor->low_tz = lo_tz;
+ sensor->high_tz = hi_tz;
}
static int of_thermal_set_trips(struct thermal_zone_device *tz,
@@ -427,6 +441,69 @@ static struct thermal_zone_device_ops of_thermal_ops = {
/*** sensor API ***/
+static void thermal_zone_of_get_trip(struct thermal_zone_device *tz,
+ int temp, int *low_trip, int *hi_trip)
+{
+ struct __thermal_zone *data = tz->devdata;
+ int low = INT_MIN;
+ int hi = INT_MAX;
+ int i;
+
+ for (i = 0; i < data->ntrips; i++) {
+ int trip_temp = data->trips[i].temperature;
+
+ if (trip_temp < temp && trip_temp > low)
+ *low_trip = i;
+ if (trip_temp > temp && trip_temp < hi)
+ *hi_trip = i;
+ }
+}
+
+/**
+ * thermal_zone_of_sensor_notify - notify framework of a trip
+ * @tzd: the thermal zone device
+ *
+ * Sensor drivers may use this API to notify the thermal framework that the
+ * temperature has crossed the trip threshold. This function is akin to
+ * thermal_notify_framework() call, but is expected to be called by a sensor
+ * that registered itself with the framework using the
+ * thermal_zone_of_add_sensor() function.
+ */
+void thermal_zone_of_sensor_notify(struct thermal_zone_device *tzd)
+{
+ struct __thermal_zone *tz = tzd->devdata;
+ struct thermal_sensor *sensor = tz->sensor;
+ int temp, low_trip, hi_trip, *trip;
+ struct thermal_zone_device *trip_tz = NULL;
+
+ if (!tz->sensor)
+ return;
+
+ if (of_thermal_get_temp(tzd, &temp))
+ return;
+
+ mutex_lock(&sensor->lock);
+ if (tzd->temperature < sensor->low_trip && sensor->low_tz) {
+ trip_tz = sensor->low_tz;
+ trip = &low_trip;
+ }
+ if (tzd->temperature > sensor->high_trip && sensor->high_tz) {
+ trip_tz = sensor->high_tz;
+ trip = &hi_trip;
+ }
+
+ if (trip_tz)
+ thermal_zone_of_get_trip(trip_tz, temp, &low_trip, &hi_trip);
+
+ mutex_unlock(&sensor->lock);
+
+ if (!trip_tz)
+ return;
+
+ thermal_notify_framework(trip_tz, *trip);
+}
+EXPORT_SYMBOL(thermal_zone_of_sensor_notify);
+
static struct thermal_zone_device *
thermal_zone_of_add_sensor(struct device_node *zone,
struct device_node *sensor_np,
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 000ae6a97678..603bf8065d7d 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -388,6 +388,7 @@ struct thermal_zone_device *devm_thermal_zone_of_sensor_register(
const struct thermal_zone_of_device_ops *ops);
void devm_thermal_zone_of_sensor_unregister(struct device *dev,
struct thermal_zone_device *tz);
+void thermal_zone_of_sensor_notify(struct thermal_zone_device *tzd);
#else
static inline struct thermal_zone_device *
thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
@@ -415,6 +416,9 @@ void devm_thermal_zone_of_sensor_unregister(struct device *dev,
{
}
+static inline
+void thermal_zone_of_sensor_notify(struct thermal_zone_device *tzd)
+{ }
#endif
#if IS_ENABLED(CONFIG_THERMAL)
--
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