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125 lines
4.1 KiB
Diff
125 lines
4.1 KiB
Diff
From 346632bc00fe71c269709702fecb474bb22e933e Mon Sep 17 00:00:00 2001
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From: Sascha Hauer <s.hauer@pengutronix.de>
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Date: Wed, 13 May 2015 10:52:39 +0200
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Subject: [PATCH 20/76] thermal: thermal: Add support for hardware-tracked
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trip points
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This adds support for hardware-tracked trip points to the device tree
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thermal sensor framework.
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The framework supports an arbitrary number of trip points. Whenever
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the current temperature is updated, the trip points immediately
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below and above the current temperature are found. A .set_trips
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callback is then called with the temperatures. If there is no trip
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point above or below the current temperature, the passed trip
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temperature will be -INT_MAX or INT_MAX respectively. In this callback,
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the driver should program the hardware such that it is notified
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when either of these trip points are triggered. When a trip point
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is triggered, the driver should call `thermal_zone_device_update'
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for the respective thermal zone. This will cause the trip points
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to be updated again.
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If .set_trips is not implemented, the framework behaves as before.
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This patch is based on an earlier version from Mikko Perttunen
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<mikko.perttunen@kapsi.fi>
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Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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---
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drivers/thermal/thermal_core.c | 43 ++++++++++++++++++++++++++++++++++++++++
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include/linux/thermal.h | 3 +++
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2 files changed, 46 insertions(+)
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diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
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index 6bbf61f..3ae1795 100644
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--- a/drivers/thermal/thermal_core.c
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+++ b/drivers/thermal/thermal_core.c
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@@ -453,6 +453,45 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
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}
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EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
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+static void thermal_zone_set_trips(struct thermal_zone_device *tz)
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+{
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+ int low = -INT_MAX;
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+ int high = INT_MAX;
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+ int trip_temp, hysteresis;
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+ int temp = tz->temperature;
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+ int i;
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+
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+ if (!tz->ops->set_trips)
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+ return;
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+
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+ /* No need to change trip points */
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+ if (temp > tz->prev_low_trip && temp < tz->prev_high_trip)
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+ return;
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+
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+ for (i = 0; i < tz->trips; i++) {
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+ int trip_low;
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+
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+ tz->ops->get_trip_temp(tz, i, &trip_temp);
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+ tz->ops->get_trip_hyst(tz, i, &hysteresis);
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+
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+ trip_low = trip_temp - hysteresis;
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+
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+ if (trip_low < temp && trip_low > low)
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+ low = trip_low;
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+
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+ if (trip_temp > temp && trip_temp < high)
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+ high = trip_temp;
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+ }
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+
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+ tz->prev_low_trip = low;
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+ tz->prev_high_trip = high;
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+
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+ dev_dbg(&tz->device, "new temperature boundaries: %d < x < %d\n",
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+ low, high);
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+
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+ tz->ops->set_trips(tz, low, high);
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+}
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+
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void thermal_zone_device_update(struct thermal_zone_device *tz)
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{
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int temp, ret, count;
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@@ -479,6 +518,8 @@ void thermal_zone_device_update(struct thermal_zone_device *tz)
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dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
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tz->last_temperature, tz->temperature);
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+ thermal_zone_set_trips(tz);
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+
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for (count = 0; count < tz->trips; count++)
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handle_thermal_trip(tz, count);
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}
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@@ -1494,6 +1535,8 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
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tz->trips = trips;
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tz->passive_delay = passive_delay;
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tz->polling_delay = polling_delay;
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+ tz->prev_low_trip = INT_MAX;
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+ tz->prev_high_trip = -INT_MAX;
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dev_set_name(&tz->device, "thermal_zone%d", tz->id);
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result = device_register(&tz->device);
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diff --git a/include/linux/thermal.h b/include/linux/thermal.h
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index 07bd5e8..aef6e13 100644
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--- a/include/linux/thermal.h
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+++ b/include/linux/thermal.h
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@@ -87,6 +87,7 @@ struct thermal_zone_device_ops {
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int (*unbind) (struct thermal_zone_device *,
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struct thermal_cooling_device *);
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int (*get_temp) (struct thermal_zone_device *, int *);
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+ int (*set_trips) (struct thermal_zone_device *, int, int);
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int (*get_mode) (struct thermal_zone_device *,
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enum thermal_device_mode *);
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int (*set_mode) (struct thermal_zone_device *,
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@@ -180,6 +181,8 @@ struct thermal_zone_device {
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int last_temperature;
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int emul_temperature;
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int passive;
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+ int prev_low_trip;
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+ int prev_high_trip;
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unsigned int forced_passive;
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const struct thermal_zone_device_ops *ops;
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const struct thermal_zone_params *tzp;
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--
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1.7.10.4
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