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-rw-r--r--drivers/thermal/gov_bang_bang.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/drivers/thermal/gov_bang_bang.c b/drivers/thermal/gov_bang_bang.c
new file mode 100644
index 000000000..a08bbe33b
--- /dev/null
+++ b/drivers/thermal/gov_bang_bang.c
@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * gov_bang_bang.c - A simple thermal throttling governor using hysteresis
+ *
+ * Copyright (C) 2014 Peter Kaestle <peter@piie.net>
+ *
+ * Based on step_wise.c with following Copyrights:
+ * Copyright (C) 2012 Intel Corp
+ * Copyright (C) 2012 Durgadoss R <durgadoss.r@intel.com>
+ */
+
+#include <linux/thermal.h>
+
+#include "thermal_core.h"
+
+static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
+{
+ int trip_temp, trip_hyst;
+ struct thermal_instance *instance;
+
+ tz->ops->get_trip_temp(tz, trip, &trip_temp);
+
+ if (!tz->ops->get_trip_hyst) {
+ pr_warn_once("Undefined get_trip_hyst for thermal zone %s - "
+ "running with default hysteresis zero\n", tz->type);
+ trip_hyst = 0;
+ } else
+ tz->ops->get_trip_hyst(tz, trip, &trip_hyst);
+
+ dev_dbg(&tz->device, "Trip%d[temp=%d]:temp=%d:hyst=%d\n",
+ trip, trip_temp, tz->temperature,
+ trip_hyst);
+
+ list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
+ if (instance->trip != trip)
+ continue;
+
+ /* in case fan is in initial state, switch the fan off */
+ if (instance->target == THERMAL_NO_TARGET)
+ instance->target = 0;
+
+ /* in case fan is neither on nor off set the fan to active */
+ if (instance->target != 0 && instance->target != 1) {
+ pr_warn("Thermal instance %s controlled by bang-bang has unexpected state: %ld\n",
+ instance->name, instance->target);
+ instance->target = 1;
+ }
+
+ /*
+ * enable fan when temperature exceeds trip_temp and disable
+ * the fan in case it falls below trip_temp minus hysteresis
+ */
+ if (instance->target == 0 && tz->temperature >= trip_temp)
+ instance->target = 1;
+ else if (instance->target == 1 &&
+ tz->temperature <= trip_temp - trip_hyst)
+ instance->target = 0;
+
+ dev_dbg(&instance->cdev->device, "target=%d\n",
+ (int)instance->target);
+
+ mutex_lock(&instance->cdev->lock);
+ instance->cdev->updated = false; /* cdev needs update */
+ mutex_unlock(&instance->cdev->lock);
+ }
+}
+
+/**
+ * bang_bang_control - controls devices associated with the given zone
+ * @tz: thermal_zone_device
+ * @trip: the trip point
+ *
+ * Regulation Logic: a two point regulation, deliver cooling state depending
+ * on the previous state shown in this diagram:
+ *
+ * Fan: OFF ON
+ *
+ * |
+ * |
+ * trip_temp: +---->+
+ * | | ^
+ * | | |
+ * | | Temperature
+ * (trip_temp - hyst): +<----+
+ * |
+ * |
+ * |
+ *
+ * * If the fan is not running and temperature exceeds trip_temp, the fan
+ * gets turned on.
+ * * In case the fan is running, temperature must fall below
+ * (trip_temp - hyst) so that the fan gets turned off again.
+ *
+ */
+static int bang_bang_control(struct thermal_zone_device *tz, int trip)
+{
+ struct thermal_instance *instance;
+
+ lockdep_assert_held(&tz->lock);
+
+ thermal_zone_trip_update(tz, trip);
+
+ list_for_each_entry(instance, &tz->thermal_instances, tz_node)
+ thermal_cdev_update(instance->cdev);
+
+ return 0;
+}
+
+static struct thermal_governor thermal_gov_bang_bang = {
+ .name = "bang_bang",
+ .throttle = bang_bang_control,
+};
+THERMAL_GOVERNOR_DECLARE(thermal_gov_bang_bang);