@@ -3,7 +3,8 @@
#
obj-$(CONFIG_THERMAL) += thermal_sys.o
-thermal_sys-y += thermal_core.o thermal_sysfs.o
+thermal_sys-y += thermal_core.o thermal_sysfs.o \
+ thermal_helpers.o
# interface to/from other layers providing sensors
thermal_sys-$(CONFIG_THERMAL_HWMON) += thermal_hwmon.o
@@ -230,48 +230,6 @@ static void release_idr(struct idr *idr, struct mutex *lock, int id)
mutex_unlock(lock);
}
-int get_tz_trend(struct thermal_zone_device *tz, int trip)
-{
- enum thermal_trend trend;
-
- if (tz->emul_temperature || !tz->ops->get_trend ||
- tz->ops->get_trend(tz, trip, &trend)) {
- if (tz->temperature > tz->last_temperature)
- trend = THERMAL_TREND_RAISING;
- else if (tz->temperature < tz->last_temperature)
- trend = THERMAL_TREND_DROPPING;
- else
- trend = THERMAL_TREND_STABLE;
- }
-
- return trend;
-}
-EXPORT_SYMBOL(get_tz_trend);
-
-struct thermal_instance *
-get_thermal_instance(struct thermal_zone_device *tz,
- struct thermal_cooling_device *cdev, int trip)
-{
- struct thermal_instance *pos = NULL;
- struct thermal_instance *target_instance = NULL;
-
- mutex_lock(&tz->lock);
- mutex_lock(&cdev->lock);
-
- list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
- if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
- target_instance = pos;
- break;
- }
- }
-
- mutex_unlock(&cdev->lock);
- mutex_unlock(&tz->lock);
-
- return target_instance;
-}
-EXPORT_SYMBOL(get_thermal_instance);
-
static void print_bind_err_msg(struct thermal_zone_device *tz,
struct thermal_cooling_device *cdev, int ret)
{
@@ -472,105 +430,6 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
monitor_thermal_zone(tz);
}
-/**
- * thermal_zone_get_temp() - returns the temperature of a thermal zone
- * @tz: a valid pointer to a struct thermal_zone_device
- * @temp: a valid pointer to where to store the resulting temperature.
- *
- * When a valid thermal zone reference is passed, it will fetch its
- * temperature and fill @temp.
- *
- * Return: On success returns 0, an error code otherwise
- */
-int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
-{
- int ret = -EINVAL;
- int count;
- int crit_temp = INT_MAX;
- enum thermal_trip_type type;
-
- if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
- goto exit;
-
- mutex_lock(&tz->lock);
-
- ret = tz->ops->get_temp(tz, temp);
-
- if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
- for (count = 0; count < tz->trips; count++) {
- ret = tz->ops->get_trip_type(tz, count, &type);
- if (!ret && type == THERMAL_TRIP_CRITICAL) {
- ret = tz->ops->get_trip_temp(tz, count,
- &crit_temp);
- break;
- }
- }
-
- /*
- * Only allow emulating a temperature when the real temperature
- * is below the critical temperature so that the emulation code
- * cannot hide critical conditions.
- */
- if (!ret && *temp < crit_temp)
- *temp = tz->emul_temperature;
- }
-
- mutex_unlock(&tz->lock);
-exit:
- return ret;
-}
-EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
-
-void thermal_zone_set_trips(struct thermal_zone_device *tz)
-{
- int low = -INT_MAX;
- int high = INT_MAX;
- int trip_temp, hysteresis;
- int i, ret;
-
- mutex_lock(&tz->lock);
-
- if (!tz->ops->set_trips || !tz->ops->get_trip_hyst)
- goto exit;
-
- for (i = 0; i < tz->trips; i++) {
- int trip_low;
-
- tz->ops->get_trip_temp(tz, i, &trip_temp);
- tz->ops->get_trip_hyst(tz, i, &hysteresis);
-
- trip_low = trip_temp - hysteresis;
-
- if (trip_low < tz->temperature && trip_low > low)
- low = trip_low;
-
- if (trip_temp > tz->temperature && trip_temp < high)
- high = trip_temp;
- }
-
- /* No need to change trip points */
- if (tz->prev_low_trip == low && tz->prev_high_trip == high)
- goto exit;
-
- tz->prev_low_trip = low;
- tz->prev_high_trip = high;
-
- dev_dbg(&tz->device,
- "new temperature boundaries: %d < x < %d\n", low, high);
-
- /*
- * Set a temperature window. When this window is left the driver
- * must inform the thermal core via thermal_zone_device_update.
- */
- ret = tz->ops->set_trips(tz, low, high);
- if (ret)
- dev_err(&tz->device, "Failed to set trips: %d\n", ret);
-
-exit:
- mutex_unlock(&tz->lock);
-}
-EXPORT_SYMBOL_GPL(thermal_zone_set_trips);
-
static void update_temperature(struct thermal_zone_device *tz)
{
int temp, ret;
@@ -1178,35 +1037,6 @@ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
}
EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
-void thermal_cdev_update(struct thermal_cooling_device *cdev)
-{
- struct thermal_instance *instance;
- unsigned long target = 0;
-
- mutex_lock(&cdev->lock);
- /* cooling device is updated*/
- if (cdev->updated) {
- mutex_unlock(&cdev->lock);
- return;
- }
-
- /* Make sure cdev enters the deepest cooling state */
- list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
- dev_dbg(&cdev->device, "zone%d->target=%lu\n",
- instance->tz->id, instance->target);
- if (instance->target == THERMAL_NO_TARGET)
- continue;
- if (instance->target > target)
- target = instance->target;
- }
- cdev->ops->set_cur_state(cdev, target);
- cdev->updated = true;
- mutex_unlock(&cdev->lock);
- trace_cdev_update(cdev, target);
- dev_dbg(&cdev->device, "set to state %lu\n", target);
-}
-EXPORT_SYMBOL(thermal_cdev_update);
-
/**
* thermal_notify_framework - Sensor drivers use this API to notify framework
* @tz: thermal zone device
new file mode 100644
@@ -0,0 +1,196 @@
+/*
+ * thermal_helpers.c - helper functions to handle thermal devices
+ *
+ * Copyright (C) 2016 Eduardo Valentin <edubezval@gmail.com>
+ *
+ * Highly based on original thermal_core.c
+ * Copyright (C) 2008 Intel Corp
+ * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
+ * Copyright (C) 2008 Sujith Thomas <sujith.thomas@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 of the License.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/sysfs.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include <trace/events/thermal.h>
+
+#include "thermal_core.h"
+
+int get_tz_trend(struct thermal_zone_device *tz, int trip)
+{
+ enum thermal_trend trend;
+
+ if (tz->emul_temperature || !tz->ops->get_trend ||
+ tz->ops->get_trend(tz, trip, &trend)) {
+ if (tz->temperature > tz->last_temperature)
+ trend = THERMAL_TREND_RAISING;
+ else if (tz->temperature < tz->last_temperature)
+ trend = THERMAL_TREND_DROPPING;
+ else
+ trend = THERMAL_TREND_STABLE;
+ }
+
+ return trend;
+}
+EXPORT_SYMBOL(get_tz_trend);
+
+struct thermal_instance *
+get_thermal_instance(struct thermal_zone_device *tz,
+ struct thermal_cooling_device *cdev, int trip)
+{
+ struct thermal_instance *pos = NULL;
+ struct thermal_instance *target_instance = NULL;
+
+ mutex_lock(&tz->lock);
+ mutex_lock(&cdev->lock);
+
+ list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
+ if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
+ target_instance = pos;
+ break;
+ }
+ }
+
+ mutex_unlock(&cdev->lock);
+ mutex_unlock(&tz->lock);
+
+ return target_instance;
+}
+EXPORT_SYMBOL(get_thermal_instance);
+
+/**
+ * thermal_zone_get_temp() - returns the temperature of a thermal zone
+ * @tz: a valid pointer to a struct thermal_zone_device
+ * @temp: a valid pointer to where to store the resulting temperature.
+ *
+ * When a valid thermal zone reference is passed, it will fetch its
+ * temperature and fill @temp.
+ *
+ * Return: On success returns 0, an error code otherwise
+ */
+int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
+{
+ int ret = -EINVAL;
+ int count;
+ int crit_temp = INT_MAX;
+ enum thermal_trip_type type;
+
+ if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
+ goto exit;
+
+ mutex_lock(&tz->lock);
+
+ ret = tz->ops->get_temp(tz, temp);
+
+ if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
+ for (count = 0; count < tz->trips; count++) {
+ ret = tz->ops->get_trip_type(tz, count, &type);
+ if (!ret && type == THERMAL_TRIP_CRITICAL) {
+ ret = tz->ops->get_trip_temp(tz, count,
+ &crit_temp);
+ break;
+ }
+ }
+
+ /*
+ * Only allow emulating a temperature when the real temperature
+ * is below the critical temperature so that the emulation code
+ * cannot hide critical conditions.
+ */
+ if (!ret && *temp < crit_temp)
+ *temp = tz->emul_temperature;
+ }
+
+ mutex_unlock(&tz->lock);
+exit:
+ return ret;
+}
+EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
+
+void thermal_zone_set_trips(struct thermal_zone_device *tz)
+{
+ int low = -INT_MAX;
+ int high = INT_MAX;
+ int trip_temp, hysteresis;
+ int i, ret;
+
+ mutex_lock(&tz->lock);
+
+ if (!tz->ops->set_trips || !tz->ops->get_trip_hyst)
+ goto exit;
+
+ for (i = 0; i < tz->trips; i++) {
+ int trip_low;
+
+ tz->ops->get_trip_temp(tz, i, &trip_temp);
+ tz->ops->get_trip_hyst(tz, i, &hysteresis);
+
+ trip_low = trip_temp - hysteresis;
+
+ if (trip_low < tz->temperature && trip_low > low)
+ low = trip_low;
+
+ if (trip_temp > tz->temperature && trip_temp < high)
+ high = trip_temp;
+ }
+
+ /* No need to change trip points */
+ if (tz->prev_low_trip == low && tz->prev_high_trip == high)
+ goto exit;
+
+ tz->prev_low_trip = low;
+ tz->prev_high_trip = high;
+
+ dev_dbg(&tz->device,
+ "new temperature boundaries: %d < x < %d\n", low, high);
+
+ /*
+ * Set a temperature window. When this window is left the driver
+ * must inform the thermal core via thermal_zone_device_update.
+ */
+ ret = tz->ops->set_trips(tz, low, high);
+ if (ret)
+ dev_err(&tz->device, "Failed to set trips: %d\n", ret);
+
+exit:
+ mutex_unlock(&tz->lock);
+}
+EXPORT_SYMBOL_GPL(thermal_zone_set_trips);
+
+void thermal_cdev_update(struct thermal_cooling_device *cdev)
+{
+ struct thermal_instance *instance;
+ unsigned long target = 0;
+
+ mutex_lock(&cdev->lock);
+ /* cooling device is updated*/
+ if (cdev->updated) {
+ mutex_unlock(&cdev->lock);
+ return;
+ }
+
+ /* Make sure cdev enters the deepest cooling state */
+ list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
+ dev_dbg(&cdev->device, "zone%d->target=%lu\n",
+ instance->tz->id, instance->target);
+ if (instance->target == THERMAL_NO_TARGET)
+ continue;
+ if (instance->target > target)
+ target = instance->target;
+ }
+ cdev->ops->set_cur_state(cdev, target);
+ cdev->updated = true;
+ mutex_unlock(&cdev->lock);
+ trace_cdev_update(cdev, target);
+ dev_dbg(&cdev->device, "set to state %lu\n", target);
+}
+EXPORT_SYMBOL(thermal_cdev_update);
Here we have a simple code organization. This patch moves functions that do not need to handle thermal core internal data structure to thermal_helpers.c file. Cc: Zhang Rui <rui.zhang@intel.com> Cc: linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Eduardo Valentin <edubezval@gmail.com> --- drivers/thermal/Makefile | 3 +- drivers/thermal/thermal_core.c | 170 --------------------------------- drivers/thermal/thermal_helpers.c | 196 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 198 insertions(+), 171 deletions(-) create mode 100644 drivers/thermal/thermal_helpers.c