Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / thermal / gov_bang_bang.c

diff --git a/kernel/drivers/thermal/gov_bang_bang.c b/kernel/drivers/thermal/gov_bang_bang.c
new file mode 100644 (file)
index 0000000..c5dd76b
--- /dev/null
+++ b/kernel/drivers/thermal/gov_bang_bang.c
@@ -0,0 +1,131 @@
+/*
+ *  gov_bang_bang.c - A simple thermal throttling governor using hysteresis
+ *
+ *  Copyright (C) 2014 Peter Feuerer <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>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ *
+ */
+
+#include <linux/thermal.h>
+
+#include "thermal_core.h"
+
+static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
+{
+       long trip_temp;
+       unsigned long trip_hyst;
+       struct thermal_instance *instance;
+
+       tz->ops->get_trip_temp(tz, trip, &trip_temp);
+       tz->ops->get_trip_hyst(tz, trip, &trip_hyst);
+
+       dev_dbg(&tz->device, "Trip%d[temp=%ld]:temp=%d:hyst=%ld\n",
+                               trip, trip_temp, tz->temperature,
+                               trip_hyst);
+
+       mutex_lock(&tz->lock);
+
+       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);
+
+               instance->cdev->updated = false; /* cdev needs update */
+       }
+
+       mutex_unlock(&tz->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;
+
+       thermal_zone_trip_update(tz, trip);
+
+       mutex_lock(&tz->lock);
+
+       list_for_each_entry(instance, &tz->thermal_instances, tz_node)
+               thermal_cdev_update(instance->cdev);
+
+       mutex_unlock(&tz->lock);
+
+       return 0;
+}
+
+static struct thermal_governor thermal_gov_bang_bang = {
+       .name           = "bang_bang",
+       .throttle       = bang_bang_control,
+};
+
+int thermal_gov_bang_bang_register(void)
+{
+       return thermal_register_governor(&thermal_gov_bang_bang);
+}
+
+void thermal_gov_bang_bang_unregister(void)
+{
+       thermal_unregister_governor(&thermal_gov_bang_bang);
+}