trip: indicates which trip point the cooling devices is associated with
in this thermal zone.
+1.4 Thermal Zone Parameters
+1.4.1 struct thermal_bind_params
+ This structure defines the following parameters that are used to bind
+ a zone with a cooling device for a particular trip point.
+ .cdev: The cooling device pointer
+ .weight: The 'influence' of a particular cooling device on this zone.
+ This is on a percentage scale. The sum of all these weights
+ (for a particular zone) cannot exceed 100.
+ .trip_mask:This is a bit mask that gives the binding relation between
+ this thermal zone and cdev, for a particular trip point.
+ If nth bit is set, then the cdev and thermal zone are bound
+ for trip point n.
+ .match: This call back returns success(0) if the 'tz and cdev' need to
+ be bound, as per platform data.
+1.4.2 struct thermal_zone_params
+ This structure defines the platform level parameters for a thermal zone.
+ This data, for each thermal zone should come from the platform layer.
+ This is an optional feature where some platforms can choose not to
+ provide this data.
+ .governor_name: Name of the thermal governor used for this zone
+ .num_tbps: Number of thermal_bind_params entries for this zone
+ .tbp: thermal_bind_params entries
+
2. sysfs attributes structure
RO read only value
|---type: Type of the thermal zone
|---temp: Current temperature
|---mode: Working mode of the thermal zone
+ |---policy: Thermal governor used for this zone
|---trip_point_[0-*]_temp: Trip point temperature
|---trip_point_[0-*]_type: Trip point type
|---trip_point_[0-*]_hyst: Hysteresis value for this trip point
charge of the thermal management.
RW, Optional
+policy
+ One of the various thermal governors used for a particular zone.
+ RW, Required
+
trip_point_[0-*]_temp
The temperature above which trip point will be fired.
Unit: millidegree Celsius
|---type: acpitz
|---temp: 37000
|---mode: enabled
+ |---policy: step_wise
|---trip_point_0_temp: 100000
|---trip_point_0_type: critical
|---trip_point_1_temp: 80000
event will be one of:{THERMAL_AUX0, THERMAL_AUX1, THERMAL_CRITICAL,
THERMAL_DEV_FAULT}. Notification can be sent when the current temperature
crosses any of the configured thresholds.
+
+5. Export Symbol APIs:
+
+5.1: get_tz_trend:
+This function returns the trend of a thermal zone, i.e the rate of change
+of temperature of the thermal zone. Ideally, the thermal sensor drivers
+are supposed to implement the callback. If they don't, the thermal
+framework calculated the trend by comparing the previous and the current
+temperature values.
+
+5.2:get_thermal_instance:
+This function returns the thermal_instance corresponding to a given
+{thermal_zone, cooling_device, trip_point} combination. Returns NULL
+if such an instance does not exist.
+
+5.3:notify_thermal_framework:
+This function handles the trip events from sensor drivers. It starts
+throttling the cooling devices according to the policy configured.
+For CRITICAL and HOT trip points, this notifies the respective drivers,
+and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
+The throttling policy is based on the configured platform data; if no
+platform data is provided, this uses the step_wise throttling policy.
+
+5.4:thermal_cdev_update:
+This function serves as an arbitrator to set the state of a cooling
+device. It sets the cooling device to the deepest cooling state if
+possible.
+
+5.5:thermal_register_governor:
+This function lets the various thermal governors to register themselves
+with the Thermal framework. At run time, depending on a zone's platform
+data, a particular governor is used for throttling.
+
+5.6:thermal_unregister_governor:
+This function unregisters a governor from the thermal framework.
if (tz->trips.passive.flags.valid)
tz->thermal_zone =
thermal_zone_device_register("acpitz", trips, 0, tz,
- &acpi_thermal_zone_ops,
+ &acpi_thermal_zone_ops, NULL,
tz->trips.passive.tsp*100,
tz->polling_frequency*100);
else
tz->thermal_zone =
thermal_zone_device_register("acpitz", trips, 0, tz,
- &acpi_thermal_zone_ops, 0,
- tz->polling_frequency*100);
+ &acpi_thermal_zone_ops, NULL,
+ 0, tz->polling_frequency*100);
if (IS_ERR(tz->thermal_zone))
return -ENODEV;
return -EINVAL;
thz_dev = thermal_zone_device_register("acerhdf", 1, 0, NULL,
- &acerhdf_dev_ops, 0,
+ &acerhdf_dev_ops, NULL, 0,
(kernelmode) ? interval*1000 : 0);
if (IS_ERR(thz_dev))
return -EINVAL;
goto err;
}
pinfo->tzd[i] = thermal_zone_device_register(name[i],
- 0, 0, td_info, &tzd_ops, 0, 0);
+ 0, 0, td_info, &tzd_ops, NULL, 0, 0);
if (IS_ERR(pinfo->tzd[i])) {
kfree(td_info);
ret = PTR_ERR(pinfo->tzd[i]);
for (i = 0; i < psy->num_properties; i++) {
if (psy->properties[i] == POWER_SUPPLY_PROP_TEMP) {
psy->tzd = thermal_zone_device_register(psy->name, 0, 0,
- psy, &psy_tzd_ops, 0, 0);
+ psy, &psy_tzd_ops, NULL, 0, 0);
if (IS_ERR(psy->tzd))
return PTR_ERR(psy->tzd);
break;
/* Create thermal zone */
data->omap_thermal = thermal_zone_device_register(domain,
OMAP_TRIP_NUMBER, 0, data, &omap_thermal_ops,
- FAST_TEMP_MONITORING_RATE,
+ NULL, FAST_TEMP_MONITORING_RATE,
FAST_TEMP_MONITORING_RATE);
if (IS_ERR_OR_NULL(data->omap_thermal)) {
dev_err(bg_ptr->dev, "thermal zone device is NULL\n");
help
If you say yes here you get support for TMU (Thermal Managment
Unit) on SAMSUNG EXYNOS series of SoC.
+
+config FAIR_SHARE
+ bool "Fair-share thermal governor"
+ depends on THERMAL
+ help
+ Enable this to manage platform thermals using fair-share governor.
+
+config STEP_WISE
+ bool "Step_wise thermal governor"
+ depends on THERMAL
+ help
+ Enable this to manage platform thermals using a simple linear
+
+config USER_SPACE
+ bool "User_space thermal governor"
+ depends on THERMAL
+ help
+ Enable this to let the user space manage the platform thermals.
+
+choice
+ prompt "Default Thermal governor"
+ depends on THERMAL
+ default THERMAL_DEFAULT_GOV_STEP_WISE
+ help
+ This option sets which thermal governor shall be loaded at
+ startup. If in doubt, select 'step_wise'.
+
+config THERMAL_DEFAULT_GOV_STEP_WISE
+ bool "step_wise"
+ select STEP_WISE
+ help
+ Use the step_wise governor as default. This throttles the
+ devices one step at a time.
+
+config THERMAL_DEFAULT_GOV_FAIR_SHARE
+ bool "fair_share"
+ select FAIR_SHARE
+ help
+ Use the fair_share governor as default. This throttles the
+ devices based on their 'contribution' to a zone. The
+ contribution should be provided through platform data.
+
+config THERMAL_DEFAULT_GOV_USER_SPACE
+ bool "user_space"
+ select USER_SPACE
+ help
+ Select this if you want to let the user space manage the
+ platform thermals.
+endchoice
obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o
obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o
+obj-$(CONFIG_FAIR_SHARE) += fair_share.o
+obj-$(CONFIG_STEP_WISE) += step_wise.o
+obj-$(CONFIG_USER_SPACE) += user_space.o
th_zone->cool_dev_size++;
th_zone->therm_dev = thermal_zone_device_register(sensor_conf->name,
- EXYNOS_ZONE_COUNT, 0, NULL, &exynos_dev_ops, 0,
+ EXYNOS_ZONE_COUNT, 0, NULL, &exynos_dev_ops, NULL, 0,
IDLE_INTERVAL);
if (IS_ERR(th_zone->therm_dev)) {
--- /dev/null
+/*
+ * fair_share.c - A simple weight based Thermal governor
+ *
+ * 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 of the License.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/thermal.h>
+
+#include "thermal_core.h"
+
+/**
+ * get_trip_level: - obtains the current trip level for a zone
+ * @tz: thermal zone device
+ */
+static int get_trip_level(struct thermal_zone_device *tz)
+{
+ int count = 0;
+ unsigned long trip_temp;
+
+ if (tz->trips == 0 || !tz->ops->get_trip_temp)
+ return 0;
+
+ for (count = 0; count < tz->trips; count++) {
+ tz->ops->get_trip_temp(tz, count, &trip_temp);
+ if (tz->temperature < trip_temp)
+ break;
+ }
+ return count;
+}
+
+static long get_target_state(struct thermal_zone_device *tz,
+ struct thermal_cooling_device *cdev, int weight, int level)
+{
+ unsigned long max_state;
+
+ cdev->ops->get_max_state(cdev, &max_state);
+
+ return (long)(weight * level * max_state) / (100 * tz->trips);
+}
+
+/**
+ * fair_share_throttle - throttles devices asscciated with the given zone
+ * @tz - thermal_zone_device
+ *
+ * Throttling Logic: This uses three parameters to calculate the new
+ * throttle state of the cooling devices associated with the given zone.
+ *
+ * Parameters used for Throttling:
+ * P1. max_state: Maximum throttle state exposed by the cooling device.
+ * P2. weight[i]/100:
+ * How 'effective' the 'i'th device is, in cooling the given zone.
+ * P3. cur_trip_level/max_no_of_trips:
+ * This describes the extent to which the devices should be throttled.
+ * We do not want to throttle too much when we trip a lower temperature,
+ * whereas the throttling is at full swing if we trip critical levels.
+ * (Heavily assumes the trip points are in ascending order)
+ * new_state of cooling device = P3 * P2 * P1
+ */
+static int fair_share_throttle(struct thermal_zone_device *tz, int trip)
+{
+ const struct thermal_zone_params *tzp;
+ struct thermal_cooling_device *cdev;
+ struct thermal_instance *instance;
+ int i;
+ int cur_trip_level = get_trip_level(tz);
+
+ if (!tz->tzp || !tz->tzp->tbp)
+ return -EINVAL;
+
+ tzp = tz->tzp;
+
+ for (i = 0; i < tzp->num_tbps; i++) {
+ if (!tzp->tbp[i].cdev)
+ continue;
+
+ cdev = tzp->tbp[i].cdev;
+ instance = get_thermal_instance(tz, cdev, trip);
+ if (!instance)
+ continue;
+
+ instance->target = get_target_state(tz, cdev,
+ tzp->tbp[i].weight, cur_trip_level);
+
+ instance->cdev->updated = false;
+ thermal_cdev_update(cdev);
+ }
+ return 0;
+}
+
+static struct thermal_governor thermal_gov_fair_share = {
+ .name = "fair_share",
+ .throttle = fair_share_throttle,
+ .owner = THIS_MODULE,
+};
+
+static int __init thermal_gov_fair_share_init(void)
+{
+ return thermal_register_governor(&thermal_gov_fair_share);
+}
+
+static void __exit thermal_gov_fair_share_exit(void)
+{
+ thermal_unregister_governor(&thermal_gov_fair_share);
+}
+
+/* This should load after thermal framework */
+fs_initcall(thermal_gov_fair_share_init);
+module_exit(thermal_gov_fair_share_exit);
+
+MODULE_AUTHOR("Durgadoss R");
+MODULE_DESCRIPTION("A simple weight based thermal throttling governor");
+MODULE_LICENSE("GPL");
}
zone = thermal_zone_device_register("rcar_thermal", 0, 0, priv,
- &rcar_thermal_zone_ops, 0, 0);
+ &rcar_thermal_zone_ops, NULL, 0, 0);
if (IS_ERR(zone)) {
dev_err(&pdev->dev, "thermal zone device is NULL\n");
ret = PTR_ERR(zone);
writel_relaxed(stdev->flags, stdev->thermal_base);
spear_thermal = thermal_zone_device_register("spear_thermal", 0, 0,
- stdev, &ops, 0, 0);
+ stdev, &ops, NULL, 0, 0);
if (IS_ERR(spear_thermal)) {
dev_err(&pdev->dev, "thermal zone device is NULL\n");
ret = PTR_ERR(spear_thermal);
--- /dev/null
+/*
+ * step_wise.c - A step-by-step Thermal throttling governor
+ *
+ * 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 of the License.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/thermal.h>
+
+#include "thermal_core.h"
+
+/*
+ * If the temperature is higher than a trip point,
+ * a. if the trend is THERMAL_TREND_RAISING, use higher cooling
+ * state for this trip point
+ * b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
+ * state for this trip point
+ */
+static unsigned long get_target_state(struct thermal_instance *instance,
+ enum thermal_trend trend)
+{
+ struct thermal_cooling_device *cdev = instance->cdev;
+ unsigned long cur_state;
+
+ cdev->ops->get_cur_state(cdev, &cur_state);
+
+ if (trend == THERMAL_TREND_RAISING) {
+ cur_state = cur_state < instance->upper ?
+ (cur_state + 1) : instance->upper;
+ } else if (trend == THERMAL_TREND_DROPPING) {
+ cur_state = cur_state > instance->lower ?
+ (cur_state - 1) : instance->lower;
+ }
+
+ return cur_state;
+}
+
+static void update_passive_instance(struct thermal_zone_device *tz,
+ enum thermal_trip_type type, int value)
+{
+ /*
+ * If value is +1, activate a passive instance.
+ * If value is -1, deactivate a passive instance.
+ */
+ if (type == THERMAL_TRIP_PASSIVE || type == THERMAL_TRIPS_NONE)
+ tz->passive += value;
+}
+
+static void update_instance_for_throttle(struct thermal_zone_device *tz,
+ int trip, enum thermal_trip_type trip_type,
+ enum thermal_trend trend)
+{
+ struct thermal_instance *instance;
+
+ list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
+ if (instance->trip != trip)
+ continue;
+
+ instance->target = get_target_state(instance, trend);
+
+ /* Activate a passive thermal instance */
+ if (instance->target == THERMAL_NO_TARGET)
+ update_passive_instance(tz, trip_type, 1);
+
+ instance->cdev->updated = false; /* cdev needs update */
+ }
+}
+
+static void update_instance_for_dethrottle(struct thermal_zone_device *tz,
+ int trip, enum thermal_trip_type trip_type)
+{
+ struct thermal_instance *instance;
+ struct thermal_cooling_device *cdev;
+ unsigned long cur_state;
+
+ list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
+ if (instance->trip != trip ||
+ instance->target == THERMAL_NO_TARGET)
+ continue;
+
+ cdev = instance->cdev;
+ cdev->ops->get_cur_state(cdev, &cur_state);
+
+ instance->target = cur_state > instance->lower ?
+ (cur_state - 1) : THERMAL_NO_TARGET;
+
+ /* Deactivate a passive thermal instance */
+ if (instance->target == THERMAL_NO_TARGET)
+ update_passive_instance(tz, trip_type, -1);
+
+ cdev->updated = false; /* cdev needs update */
+ }
+}
+
+static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
+{
+ long trip_temp;
+ enum thermal_trip_type trip_type;
+ enum thermal_trend trend;
+
+ if (trip == THERMAL_TRIPS_NONE) {
+ trip_temp = tz->forced_passive;
+ trip_type = THERMAL_TRIPS_NONE;
+ } else {
+ tz->ops->get_trip_temp(tz, trip, &trip_temp);
+ tz->ops->get_trip_type(tz, trip, &trip_type);
+ }
+
+ trend = get_tz_trend(tz, trip);
+
+ mutex_lock(&tz->lock);
+
+ if (tz->temperature >= trip_temp)
+ update_instance_for_throttle(tz, trip, trip_type, trend);
+ else
+ update_instance_for_dethrottle(tz, trip, trip_type);
+
+ mutex_unlock(&tz->lock);
+}
+
+/**
+ * step_wise_throttle - throttles devices asscciated with the given zone
+ * @tz - thermal_zone_device
+ * @trip - the trip point
+ * @trip_type - type of the trip point
+ *
+ * Throttling Logic: This uses the trend of the thermal zone to throttle.
+ * If the thermal zone is 'heating up' this throttles all the cooling
+ * devices associated with the zone and its particular trip point, by one
+ * step. If the zone is 'cooling down' it brings back the performance of
+ * the devices by one step.
+ */
+static int step_wise_throttle(struct thermal_zone_device *tz, int trip)
+{
+ struct thermal_instance *instance;
+
+ thermal_zone_trip_update(tz, trip);
+
+ if (tz->forced_passive)
+ thermal_zone_trip_update(tz, THERMAL_TRIPS_NONE);
+
+ 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_step_wise = {
+ .name = DEFAULT_THERMAL_GOVERNOR,
+ .throttle = step_wise_throttle,
+ .owner = THIS_MODULE,
+};
+
+static int __init thermal_gov_step_wise_init(void)
+{
+ return thermal_register_governor(&thermal_gov_step_wise);
+}
+
+static void __exit thermal_gov_step_wise_exit(void)
+{
+ thermal_unregister_governor(&thermal_gov_step_wise);
+}
+
+/* This should load after thermal framework */
+fs_initcall(thermal_gov_step_wise_init);
+module_exit(thermal_gov_step_wise_exit);
+
+MODULE_AUTHOR("Durgadoss R");
+MODULE_DESCRIPTION("A step-by-step thermal throttling governor");
+MODULE_LICENSE("GPL");
--- /dev/null
+/*
+ * thermal_core.h
+ *
+ * Copyright (C) 2012 Intel Corp
+ * Author: 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 of the License.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#ifndef __THERMAL_CORE_H__
+#define __THERMAL_CORE_H__
+
+#include <linux/device.h>
+#include <linux/thermal.h>
+
+/* Initial state of a cooling device during binding */
+#define THERMAL_NO_TARGET -1UL
+
+/*
+ * This structure is used to describe the behavior of
+ * a certain cooling device on a certain trip point
+ * in a certain thermal zone
+ */
+struct thermal_instance {
+ int id;
+ char name[THERMAL_NAME_LENGTH];
+ struct thermal_zone_device *tz;
+ struct thermal_cooling_device *cdev;
+ int trip;
+ unsigned long upper; /* Highest cooling state for this trip point */
+ unsigned long lower; /* Lowest cooling state for this trip point */
+ unsigned long target; /* expected cooling state */
+ char attr_name[THERMAL_NAME_LENGTH];
+ struct device_attribute attr;
+ struct list_head tz_node; /* node in tz->thermal_instances */
+ struct list_head cdev_node; /* node in cdev->thermal_instances */
+};
+
+#endif /* __THERMAL_CORE_H__ */
#include <net/netlink.h>
#include <net/genetlink.h>
+#include "thermal_core.h"
+
MODULE_AUTHOR("Zhang Rui");
MODULE_DESCRIPTION("Generic thermal management sysfs support");
MODULE_LICENSE("GPL");
-#define THERMAL_NO_TARGET -1UL
-/*
- * This structure is used to describe the behavior of
- * a certain cooling device on a certain trip point
- * in a certain thermal zone
- */
-struct thermal_instance {
- int id;
- char name[THERMAL_NAME_LENGTH];
- struct thermal_zone_device *tz;
- struct thermal_cooling_device *cdev;
- int trip;
- unsigned long upper; /* Highest cooling state for this trip point */
- unsigned long lower; /* Lowest cooling state for this trip point */
- unsigned long target; /* expected cooling state */
- char attr_name[THERMAL_NAME_LENGTH];
- struct device_attribute attr;
- struct list_head tz_node; /* node in tz->thermal_instances */
- struct list_head cdev_node; /* node in cdev->thermal_instances */
-};
-
static DEFINE_IDR(thermal_tz_idr);
static DEFINE_IDR(thermal_cdev_idr);
static DEFINE_MUTEX(thermal_idr_lock);
static LIST_HEAD(thermal_tz_list);
static LIST_HEAD(thermal_cdev_list);
+static LIST_HEAD(thermal_governor_list);
+
static DEFINE_MUTEX(thermal_list_lock);
+static DEFINE_MUTEX(thermal_governor_lock);
+
+static struct thermal_governor *__find_governor(const char *name)
+{
+ struct thermal_governor *pos;
+
+ list_for_each_entry(pos, &thermal_governor_list, governor_list)
+ if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
+ return pos;
+
+ return NULL;
+}
+
+int thermal_register_governor(struct thermal_governor *governor)
+{
+ int err;
+ const char *name;
+ struct thermal_zone_device *pos;
+
+ if (!governor)
+ return -EINVAL;
+
+ mutex_lock(&thermal_governor_lock);
+
+ err = -EBUSY;
+ if (__find_governor(governor->name) == NULL) {
+ err = 0;
+ list_add(&governor->governor_list, &thermal_governor_list);
+ }
+
+ mutex_lock(&thermal_list_lock);
+
+ list_for_each_entry(pos, &thermal_tz_list, node) {
+ if (pos->governor)
+ continue;
+ if (pos->tzp)
+ name = pos->tzp->governor_name;
+ else
+ name = DEFAULT_THERMAL_GOVERNOR;
+ if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
+ pos->governor = governor;
+ }
+
+ mutex_unlock(&thermal_list_lock);
+ mutex_unlock(&thermal_governor_lock);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(thermal_register_governor);
+
+void thermal_unregister_governor(struct thermal_governor *governor)
+{
+ struct thermal_zone_device *pos;
+
+ if (!governor)
+ return;
+
+ mutex_lock(&thermal_governor_lock);
+
+ if (__find_governor(governor->name) == NULL)
+ goto exit;
+
+ mutex_lock(&thermal_list_lock);
+
+ list_for_each_entry(pos, &thermal_tz_list, node) {
+ if (!strnicmp(pos->governor->name, governor->name,
+ THERMAL_NAME_LENGTH))
+ pos->governor = NULL;
+ }
+
+ mutex_unlock(&thermal_list_lock);
+ list_del(&governor->governor_list);
+exit:
+ mutex_unlock(&thermal_governor_lock);
+ return;
+}
+EXPORT_SYMBOL_GPL(thermal_unregister_governor);
static int get_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->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)
+{
+ dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
+ tz->type, cdev->type, ret);
+}
+
+static void __bind(struct thermal_zone_device *tz, int mask,
+ struct thermal_cooling_device *cdev)
+{
+ int i, ret;
+
+ for (i = 0; i < tz->trips; i++) {
+ if (mask & (1 << i)) {
+ ret = thermal_zone_bind_cooling_device(tz, i, cdev,
+ THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
+ if (ret)
+ print_bind_err_msg(tz, cdev, ret);
+ }
+ }
+}
+
+static void __unbind(struct thermal_zone_device *tz, int mask,
+ struct thermal_cooling_device *cdev)
+{
+ int i;
+
+ for (i = 0; i < tz->trips; i++)
+ if (mask & (1 << i))
+ thermal_zone_unbind_cooling_device(tz, i, cdev);
+}
+
+static void bind_cdev(struct thermal_cooling_device *cdev)
+{
+ int i, ret;
+ const struct thermal_zone_params *tzp;
+ struct thermal_zone_device *pos = NULL;
+
+ mutex_lock(&thermal_list_lock);
+
+ list_for_each_entry(pos, &thermal_tz_list, node) {
+ if (!pos->tzp && !pos->ops->bind)
+ continue;
+
+ if (!pos->tzp && pos->ops->bind) {
+ ret = pos->ops->bind(pos, cdev);
+ if (ret)
+ print_bind_err_msg(pos, cdev, ret);
+ }
+
+ tzp = pos->tzp;
+ if (!tzp || !tzp->tbp)
+ continue;
+
+ for (i = 0; i < tzp->num_tbps; i++) {
+ if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
+ continue;
+ if (tzp->tbp[i].match(pos, cdev))
+ continue;
+ tzp->tbp[i].cdev = cdev;
+ __bind(pos, tzp->tbp[i].trip_mask, cdev);
+ }
+ }
+
+ mutex_unlock(&thermal_list_lock);
+}
+
+static void bind_tz(struct thermal_zone_device *tz)
+{
+ int i, ret;
+ struct thermal_cooling_device *pos = NULL;
+ const struct thermal_zone_params *tzp = tz->tzp;
+
+ if (!tzp && !tz->ops->bind)
+ return;
+
+ mutex_lock(&thermal_list_lock);
+
+ /* If there is no platform data, try to use ops->bind */
+ if (!tzp && tz->ops->bind) {
+ list_for_each_entry(pos, &thermal_cdev_list, node) {
+ ret = tz->ops->bind(tz, pos);
+ if (ret)
+ print_bind_err_msg(tz, pos, ret);
+ }
+ goto exit;
+ }
+
+ if (!tzp || !tzp->tbp)
+ goto exit;
+
+ list_for_each_entry(pos, &thermal_cdev_list, node) {
+ for (i = 0; i < tzp->num_tbps; i++) {
+ if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
+ continue;
+ if (tzp->tbp[i].match(tz, pos))
+ continue;
+ tzp->tbp[i].cdev = pos;
+ __bind(tz, tzp->tbp[i].trip_mask, pos);
+ }
+ }
+exit:
+ mutex_unlock(&thermal_list_lock);
+}
+
+static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
+ int delay)
+{
+ if (delay > 1000)
+ mod_delayed_work(system_freezable_wq, &tz->poll_queue,
+ round_jiffies(msecs_to_jiffies(delay)));
+ else if (delay)
+ mod_delayed_work(system_freezable_wq, &tz->poll_queue,
+ msecs_to_jiffies(delay));
+ else
+ cancel_delayed_work(&tz->poll_queue);
+}
+
+static void monitor_thermal_zone(struct thermal_zone_device *tz)
+{
+ mutex_lock(&tz->lock);
+
+ if (tz->passive)
+ thermal_zone_device_set_polling(tz, tz->passive_delay);
+ else if (tz->polling_delay)
+ thermal_zone_device_set_polling(tz, tz->polling_delay);
+ else
+ thermal_zone_device_set_polling(tz, 0);
+
+ mutex_unlock(&tz->lock);
+}
+
+static void handle_non_critical_trips(struct thermal_zone_device *tz,
+ int trip, enum thermal_trip_type trip_type)
+{
+ tz->governor->throttle(tz, trip);
+}
+
+static void handle_critical_trips(struct thermal_zone_device *tz,
+ int trip, enum thermal_trip_type trip_type)
+{
+ long trip_temp;
+
+ tz->ops->get_trip_temp(tz, trip, &trip_temp);
+
+ /* If we have not crossed the trip_temp, we do not care. */
+ if (tz->temperature < trip_temp)
+ return;
+
+ if (tz->ops->notify)
+ tz->ops->notify(tz, trip, trip_type);
+
+ if (trip_type == THERMAL_TRIP_CRITICAL) {
+ pr_emerg("Critical temperature reached(%d C),shutting down\n",
+ tz->temperature / 1000);
+ orderly_poweroff(true);
+ }
+}
+
+static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
+{
+ enum thermal_trip_type type;
+
+ tz->ops->get_trip_type(tz, trip, &type);
+
+ if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
+ handle_critical_trips(tz, trip, type);
+ else
+ handle_non_critical_trips(tz, trip, type);
+ /*
+ * Alright, we handled this trip successfully.
+ * So, start monitoring again.
+ */
+ monitor_thermal_zone(tz);
+}
+
+static void update_temperature(struct thermal_zone_device *tz)
+{
+ long temp;
+ int ret;
+
+ mutex_lock(&tz->lock);
+
+ ret = tz->ops->get_temp(tz, &temp);
+ if (ret) {
+ pr_warn("failed to read out thermal zone %d\n", tz->id);
+ goto exit;
+ }
+
+ tz->last_temperature = tz->temperature;
+ tz->temperature = temp;
+
+exit:
+ mutex_unlock(&tz->lock);
+}
+
+void thermal_zone_device_update(struct thermal_zone_device *tz)
+{
+ int count;
+
+ update_temperature(tz);
+
+ for (count = 0; count < tz->trips; count++)
+ handle_thermal_trip(tz, count);
+}
+EXPORT_SYMBOL(thermal_zone_device_update);
+
+static void thermal_zone_device_check(struct work_struct *work)
+{
+ struct thermal_zone_device *tz = container_of(work, struct
+ thermal_zone_device,
+ poll_queue.work);
+ thermal_zone_device_update(tz);
+}
+
/* sys I/F for thermal zone */
#define to_thermal_zone(_dev) \
return sprintf(buf, "%d\n", tz->forced_passive);
}
+static ssize_t
+policy_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret = -EINVAL;
+ struct thermal_zone_device *tz = to_thermal_zone(dev);
+ struct thermal_governor *gov;
+
+ mutex_lock(&thermal_governor_lock);
+
+ gov = __find_governor(buf);
+ if (!gov)
+ goto exit;
+
+ tz->governor = gov;
+ ret = count;
+
+exit:
+ mutex_unlock(&thermal_governor_lock);
+ return ret;
+}
+
+static ssize_t
+policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
+{
+ struct thermal_zone_device *tz = to_thermal_zone(dev);
+
+ return sprintf(buf, "%s\n", tz->governor->name);
+}
+
static DEVICE_ATTR(type, 0444, type_show, NULL);
static DEVICE_ATTR(temp, 0444, temp_show, NULL);
static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
+static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
/* sys I/F for cooling device */
#define to_cooling_device(_dev) \
}
#endif
-static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
- int delay)
-{
- if (delay > 1000)
- mod_delayed_work(system_freezable_wq, &tz->poll_queue,
- round_jiffies(msecs_to_jiffies(delay)));
- else if (delay)
- mod_delayed_work(system_freezable_wq, &tz->poll_queue,
- msecs_to_jiffies(delay));
- else
- cancel_delayed_work(&tz->poll_queue);
-}
-
-static void thermal_zone_device_check(struct work_struct *work)
-{
- struct thermal_zone_device *tz = container_of(work, struct
- thermal_zone_device,
- poll_queue.work);
- thermal_zone_device_update(tz);
-}
-
/**
* thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
* @tz: thermal zone device
const struct thermal_cooling_device_ops *ops)
{
struct thermal_cooling_device *cdev;
- struct thermal_zone_device *pos;
int result;
if (type && strlen(type) >= THERMAL_NAME_LENGTH)
if (result)
goto unregister;
+ /* Add 'this' new cdev to the global cdev list */
mutex_lock(&thermal_list_lock);
list_add(&cdev->node, &thermal_cdev_list);
- list_for_each_entry(pos, &thermal_tz_list, node) {
- if (!pos->ops->bind)
- continue;
- result = pos->ops->bind(pos, cdev);
- if (result)
- break;
-
- }
mutex_unlock(&thermal_list_lock);
- if (!result)
- return cdev;
+ /* Update binding information for 'this' new cdev */
+ bind_cdev(cdev);
+
+ return cdev;
unregister:
release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
* thermal_cooling_device_unregister() must be called when the device is no
* longer needed.
*/
-void thermal_cooling_device_unregister(struct
- thermal_cooling_device
- *cdev)
+void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
{
+ int i;
+ const struct thermal_zone_params *tzp;
struct thermal_zone_device *tz;
struct thermal_cooling_device *pos = NULL;
return;
}
list_del(&cdev->node);
+
+ /* Unbind all thermal zones associated with 'this' cdev */
list_for_each_entry(tz, &thermal_tz_list, node) {
- if (!tz->ops->unbind)
+ if (tz->ops->unbind) {
+ tz->ops->unbind(tz, cdev);
continue;
- tz->ops->unbind(tz, cdev);
+ }
+
+ if (!tz->tzp || !tz->tzp->tbp)
+ continue;
+
+ tzp = tz->tzp;
+ for (i = 0; i < tzp->num_tbps; i++) {
+ if (tzp->tbp[i].cdev == cdev) {
+ __unbind(tz, tzp->tbp[i].trip_mask, cdev);
+ tzp->tbp[i].cdev = NULL;
+ }
+ }
}
+
mutex_unlock(&thermal_list_lock);
+
if (cdev->type[0])
device_remove_file(&cdev->device, &dev_attr_cdev_type);
device_remove_file(&cdev->device, &dev_attr_max_state);
}
EXPORT_SYMBOL(thermal_cooling_device_unregister);
-static void thermal_cdev_do_update(struct thermal_cooling_device *cdev)
+void thermal_cdev_update(struct thermal_cooling_device *cdev)
{
struct thermal_instance *instance;
unsigned long target = 0;
cdev->ops->set_cur_state(cdev, target);
cdev->updated = true;
}
+EXPORT_SYMBOL(thermal_cdev_update);
-static void thermal_zone_do_update(struct thermal_zone_device *tz)
-{
- struct thermal_instance *instance;
-
- list_for_each_entry(instance, &tz->thermal_instances, tz_node)
- thermal_cdev_do_update(instance->cdev);
-}
-
-/*
- * Cooling algorithm for both active and passive cooling
- *
- * 1. if the temperature is higher than a trip point,
- * a. if the trend is THERMAL_TREND_RAISING, use higher cooling
- * state for this trip point
- * b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
- * state for this trip point
- *
- * 2. if the temperature is lower than a trip point, use lower
- * cooling state for this trip point
- *
- * Note that this behaves the same as the previous passive cooling
- * algorithm.
- */
-
-static void thermal_zone_trip_update(struct thermal_zone_device *tz,
- int trip, long temp)
-{
- struct thermal_instance *instance;
- struct thermal_cooling_device *cdev = NULL;
- unsigned long cur_state, max_state;
- long trip_temp;
- enum thermal_trip_type trip_type;
- enum thermal_trend trend;
-
- if (trip == THERMAL_TRIPS_NONE) {
- trip_temp = tz->forced_passive;
- trip_type = THERMAL_TRIPS_NONE;
- } else {
- tz->ops->get_trip_temp(tz, trip, &trip_temp);
- tz->ops->get_trip_type(tz, trip, &trip_type);
- }
-
- if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
- /*
- * compare the current temperature and previous temperature
- * to get the thermal trend, if no special requirement
- */
- 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;
- }
-
- if (temp >= trip_temp) {
- list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
- if (instance->trip != trip)
- continue;
-
- cdev = instance->cdev;
-
- cdev->ops->get_cur_state(cdev, &cur_state);
- cdev->ops->get_max_state(cdev, &max_state);
-
- if (trend == THERMAL_TREND_RAISING) {
- cur_state = cur_state < instance->upper ?
- (cur_state + 1) : instance->upper;
- } else if (trend == THERMAL_TREND_DROPPING) {
- cur_state = cur_state > instance->lower ?
- (cur_state - 1) : instance->lower;
- }
-
- /* activate a passive thermal instance */
- if ((trip_type == THERMAL_TRIP_PASSIVE ||
- trip_type == THERMAL_TRIPS_NONE) &&
- instance->target == THERMAL_NO_TARGET)
- tz->passive++;
-
- instance->target = cur_state;
- cdev->updated = false; /* cooling device needs update */
- }
- } else { /* below trip */
- list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
- if (instance->trip != trip)
- continue;
-
- /* Do not use the inactive thermal instance */
- if (instance->target == THERMAL_NO_TARGET)
- continue;
- cdev = instance->cdev;
- cdev->ops->get_cur_state(cdev, &cur_state);
-
- cur_state = cur_state > instance->lower ?
- (cur_state - 1) : THERMAL_NO_TARGET;
-
- /* deactivate a passive thermal instance */
- if ((trip_type == THERMAL_TRIP_PASSIVE ||
- trip_type == THERMAL_TRIPS_NONE) &&
- cur_state == THERMAL_NO_TARGET)
- tz->passive--;
- instance->target = cur_state;
- cdev->updated = false; /* cooling device needs update */
- }
- }
-
- return;
-}
/**
- * thermal_zone_device_update - force an update of a thermal zone's state
- * @ttz: the thermal zone to update
+ * notify_thermal_framework - Sensor drivers use this API to notify framework
+ * @tz: thermal zone device
+ * @trip: indicates which trip point has been crossed
+ *
+ * This function handles the trip events from sensor drivers. It starts
+ * throttling the cooling devices according to the policy configured.
+ * For CRITICAL and HOT trip points, this notifies the respective drivers,
+ * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
+ * The throttling policy is based on the configured platform data; if no
+ * platform data is provided, this uses the step_wise throttling policy.
*/
-
-void thermal_zone_device_update(struct thermal_zone_device *tz)
+void notify_thermal_framework(struct thermal_zone_device *tz, int trip)
{
- int count, ret = 0;
- long temp, trip_temp;
- enum thermal_trip_type trip_type;
-
- mutex_lock(&tz->lock);
-
- if (tz->ops->get_temp(tz, &temp)) {
- /* get_temp failed - retry it later */
- pr_warn("failed to read out thermal zone %d\n", tz->id);
- goto leave;
- }
-
- tz->last_temperature = tz->temperature;
- tz->temperature = temp;
-
- for (count = 0; count < tz->trips; count++) {
- tz->ops->get_trip_type(tz, count, &trip_type);
- tz->ops->get_trip_temp(tz, count, &trip_temp);
-
- switch (trip_type) {
- case THERMAL_TRIP_CRITICAL:
- if (temp >= trip_temp) {
- if (tz->ops->notify)
- ret = tz->ops->notify(tz, count,
- trip_type);
- if (!ret) {
- pr_emerg("Critical temperature reached (%ld C), shutting down\n",
- temp/1000);
- orderly_poweroff(true);
- }
- }
- break;
- case THERMAL_TRIP_HOT:
- if (temp >= trip_temp)
- if (tz->ops->notify)
- tz->ops->notify(tz, count, trip_type);
- break;
- case THERMAL_TRIP_ACTIVE:
- thermal_zone_trip_update(tz, count, temp);
- break;
- case THERMAL_TRIP_PASSIVE:
- if (temp >= trip_temp || tz->passive)
- thermal_zone_trip_update(tz, count, temp);
- break;
- }
- }
-
- if (tz->forced_passive)
- thermal_zone_trip_update(tz, THERMAL_TRIPS_NONE, temp);
- thermal_zone_do_update(tz);
-
-leave:
- if (tz->passive)
- thermal_zone_device_set_polling(tz, tz->passive_delay);
- else if (tz->polling_delay)
- thermal_zone_device_set_polling(tz, tz->polling_delay);
- else
- thermal_zone_device_set_polling(tz, 0);
- mutex_unlock(&tz->lock);
+ handle_thermal_trip(tz, trip);
}
-EXPORT_SYMBOL(thermal_zone_device_update);
+EXPORT_SYMBOL(notify_thermal_framework);
/**
* create_trip_attrs - create attributes for trip points
* @mask: a bit string indicating the writeablility of trip points
* @devdata: private device data
* @ops: standard thermal zone device callbacks
+ * @tzp: thermal zone platform parameters
* @passive_delay: number of milliseconds to wait between polls when
* performing passive cooling
* @polling_delay: number of milliseconds to wait between polls when checking
struct thermal_zone_device *thermal_zone_device_register(const char *type,
int trips, int mask, void *devdata,
const struct thermal_zone_device_ops *ops,
+ const struct thermal_zone_params *tzp,
int passive_delay, int polling_delay)
{
struct thermal_zone_device *tz;
- struct thermal_cooling_device *pos;
enum thermal_trip_type trip_type;
int result;
int count;
strcpy(tz->type, type ? : "");
tz->ops = ops;
+ tz->tzp = tzp;
tz->device.class = &thermal_class;
tz->devdata = devdata;
tz->trips = trips;
passive = 1;
}
- if (!passive)
- result = device_create_file(&tz->device,
- &dev_attr_passive);
+ if (!passive) {
+ result = device_create_file(&tz->device, &dev_attr_passive);
+ if (result)
+ goto unregister;
+ }
+ /* Create policy attribute */
+ result = device_create_file(&tz->device, &dev_attr_policy);
if (result)
goto unregister;
+ /* Update 'this' zone's governor information */
+ mutex_lock(&thermal_governor_lock);
+
+ if (tz->tzp)
+ tz->governor = __find_governor(tz->tzp->governor_name);
+ else
+ tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
+
+ mutex_unlock(&thermal_governor_lock);
+
result = thermal_add_hwmon_sysfs(tz);
if (result)
goto unregister;
mutex_lock(&thermal_list_lock);
list_add_tail(&tz->node, &thermal_tz_list);
- if (ops->bind)
- list_for_each_entry(pos, &thermal_cdev_list, node) {
- result = ops->bind(tz, pos);
- if (result)
- break;
- }
mutex_unlock(&thermal_list_lock);
+ /* Bind cooling devices for this zone */
+ bind_tz(tz);
+
INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
thermal_zone_device_update(tz);
*/
void thermal_zone_device_unregister(struct thermal_zone_device *tz)
{
+ int i;
+ const struct thermal_zone_params *tzp;
struct thermal_cooling_device *cdev;
struct thermal_zone_device *pos = NULL;
if (!tz)
return;
+ tzp = tz->tzp;
+
mutex_lock(&thermal_list_lock);
list_for_each_entry(pos, &thermal_tz_list, node)
if (pos == tz)
return;
}
list_del(&tz->node);
- if (tz->ops->unbind)
- list_for_each_entry(cdev, &thermal_cdev_list, node)
- tz->ops->unbind(tz, cdev);
+
+ /* Unbind all cdevs associated with 'this' thermal zone */
+ list_for_each_entry(cdev, &thermal_cdev_list, node) {
+ if (tz->ops->unbind) {
+ tz->ops->unbind(tz, cdev);
+ continue;
+ }
+
+ if (!tzp || !tzp->tbp)
+ break;
+
+ for (i = 0; i < tzp->num_tbps; i++) {
+ if (tzp->tbp[i].cdev == cdev) {
+ __unbind(tz, tzp->tbp[i].trip_mask, cdev);
+ tzp->tbp[i].cdev = NULL;
+ }
+ }
+ }
+
mutex_unlock(&thermal_list_lock);
thermal_zone_device_set_polling(tz, 0);
device_remove_file(&tz->device, &dev_attr_temp);
if (tz->ops->get_mode)
device_remove_file(&tz->device, &dev_attr_mode);
+ device_remove_file(&tz->device, &dev_attr_policy);
remove_trip_attrs(tz);
+ tz->governor = NULL;
thermal_remove_hwmon_sysfs(tz);
release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
--- /dev/null
+/*
+ * user_space.c - A simple user space Thermal events notifier
+ *
+ * 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 of the License.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/thermal.h>
+
+#include "thermal_core.h"
+
+/**
+ * notify_user_space - Notifies user space about thermal events
+ * @tz - thermal_zone_device
+ *
+ * This function notifies the user space through UEvents.
+ */
+static int notify_user_space(struct thermal_zone_device *tz, int trip)
+{
+ mutex_lock(&tz->lock);
+ kobject_uevent(&tz->device.kobj, KOBJ_CHANGE);
+ mutex_unlock(&tz->lock);
+ return 0;
+}
+
+static struct thermal_governor thermal_gov_user_space = {
+ .name = "user_space",
+ .throttle = notify_user_space,
+ .owner = THIS_MODULE,
+};
+
+static int __init thermal_gov_user_space_init(void)
+{
+ return thermal_register_governor(&thermal_gov_user_space);
+}
+
+static void __exit thermal_gov_user_space_exit(void)
+{
+ thermal_unregister_governor(&thermal_gov_user_space);
+}
+
+/* This should load after thermal framework */
+fs_initcall(thermal_gov_user_space_init);
+module_exit(thermal_gov_user_space_exit);
+
+MODULE_AUTHOR("Durgadoss R");
+MODULE_DESCRIPTION("A user space Thermal notifier");
+MODULE_LICENSE("GPL");
#include <linux/device.h>
#include <linux/workqueue.h>
+#define THERMAL_TRIPS_NONE -1
+#define THERMAL_MAX_TRIPS 12
+#define THERMAL_NAME_LENGTH 20
+
+/* No upper/lower limit requirement */
+#define THERMAL_NO_LIMIT -1UL
+
+/* Unit conversion macros */
+#define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732 >= 0) ? \
+ ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
+#define CELSIUS_TO_KELVIN(t) ((t)*10+2732)
+
+/* Adding event notification support elements */
+#define THERMAL_GENL_FAMILY_NAME "thermal_event"
+#define THERMAL_GENL_VERSION 0x01
+#define THERMAL_GENL_MCAST_GROUP_NAME "thermal_mc_group"
+
+/* Default Thermal Governor: Does Linear Throttling */
+#define DEFAULT_THERMAL_GOVERNOR "step_wise"
+
struct thermal_zone_device;
struct thermal_cooling_device;
THERMAL_TREND_DROPPING, /* temperature is dropping */
};
+/* Events supported by Thermal Netlink */
+enum events {
+ THERMAL_AUX0,
+ THERMAL_AUX1,
+ THERMAL_CRITICAL,
+ THERMAL_DEV_FAULT,
+};
+
+/* attributes of thermal_genl_family */
+enum {
+ THERMAL_GENL_ATTR_UNSPEC,
+ THERMAL_GENL_ATTR_EVENT,
+ __THERMAL_GENL_ATTR_MAX,
+};
+#define THERMAL_GENL_ATTR_MAX (__THERMAL_GENL_ATTR_MAX - 1)
+
+/* commands supported by the thermal_genl_family */
+enum {
+ THERMAL_GENL_CMD_UNSPEC,
+ THERMAL_GENL_CMD_EVENT,
+ __THERMAL_GENL_CMD_MAX,
+};
+#define THERMAL_GENL_CMD_MAX (__THERMAL_GENL_CMD_MAX - 1)
+
struct thermal_zone_device_ops {
int (*bind) (struct thermal_zone_device *,
struct thermal_cooling_device *);
int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
};
-#define THERMAL_NO_LIMIT -1UL /* no upper/lower limit requirement */
-
-#define THERMAL_TRIPS_NONE -1
-#define THERMAL_MAX_TRIPS 12
-#define THERMAL_NAME_LENGTH 20
struct thermal_cooling_device {
int id;
char type[THERMAL_NAME_LENGTH];
struct list_head node;
};
-#define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732 >= 0) ? \
- ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
-#define CELSIUS_TO_KELVIN(t) ((t)*10+2732)
-
struct thermal_attr {
struct device_attribute attr;
char name[THERMAL_NAME_LENGTH];
int passive;
unsigned int forced_passive;
const struct thermal_zone_device_ops *ops;
+ const struct thermal_zone_params *tzp;
+ struct thermal_governor *governor;
struct list_head thermal_instances;
struct idr idr;
struct mutex lock; /* protect thermal_instances list */
struct list_head node;
struct delayed_work poll_queue;
};
-/* Adding event notification support elements */
-#define THERMAL_GENL_FAMILY_NAME "thermal_event"
-#define THERMAL_GENL_VERSION 0x01
-#define THERMAL_GENL_MCAST_GROUP_NAME "thermal_mc_group"
-enum events {
- THERMAL_AUX0,
- THERMAL_AUX1,
- THERMAL_CRITICAL,
- THERMAL_DEV_FAULT,
+/* Structure that holds thermal governor information */
+struct thermal_governor {
+ char name[THERMAL_NAME_LENGTH];
+ int (*throttle)(struct thermal_zone_device *tz, int trip);
+ struct list_head governor_list;
+ struct module *owner;
};
-struct thermal_genl_event {
- u32 orig;
- enum events event;
+/* Structure that holds binding parameters for a zone */
+struct thermal_bind_params {
+ struct thermal_cooling_device *cdev;
+
+ /*
+ * This is a measure of 'how effectively these devices can
+ * cool 'this' thermal zone. The shall be determined by platform
+ * characterization. This is on a 'percentage' scale.
+ * See Documentation/thermal/sysfs-api.txt for more information.
+ */
+ int weight;
+
+ /*
+ * This is a bit mask that gives the binding relation between this
+ * thermal zone and cdev, for a particular trip point.
+ * See Documentation/thermal/sysfs-api.txt for more information.
+ */
+ int trip_mask;
+ int (*match) (struct thermal_zone_device *tz,
+ struct thermal_cooling_device *cdev);
};
-/* attributes of thermal_genl_family */
-enum {
- THERMAL_GENL_ATTR_UNSPEC,
- THERMAL_GENL_ATTR_EVENT,
- __THERMAL_GENL_ATTR_MAX,
+
+/* Structure to define Thermal Zone parameters */
+struct thermal_zone_params {
+ char governor_name[THERMAL_NAME_LENGTH];
+ int num_tbps; /* Number of tbp entries */
+ struct thermal_bind_params *tbp;
};
-#define THERMAL_GENL_ATTR_MAX (__THERMAL_GENL_ATTR_MAX - 1)
-/* commands supported by the thermal_genl_family */
-enum {
- THERMAL_GENL_CMD_UNSPEC,
- THERMAL_GENL_CMD_EVENT,
- __THERMAL_GENL_CMD_MAX,
+struct thermal_genl_event {
+ u32 orig;
+ enum events event;
};
-#define THERMAL_GENL_CMD_MAX (__THERMAL_GENL_CMD_MAX - 1)
+/* Function declarations */
struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
- void *, const struct thermal_zone_device_ops *, int, int);
+ void *, const struct thermal_zone_device_ops *,
+ const struct thermal_zone_params *, int, int);
void thermal_zone_device_unregister(struct thermal_zone_device *);
int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
struct thermal_cooling_device *);
void thermal_zone_device_update(struct thermal_zone_device *);
+
struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
const struct thermal_cooling_device_ops *);
void thermal_cooling_device_unregister(struct thermal_cooling_device *);
+int get_tz_trend(struct thermal_zone_device *, int);
+struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
+ struct thermal_cooling_device *, int);
+void thermal_cdev_update(struct thermal_cooling_device *);
+void notify_thermal_framework(struct thermal_zone_device *, int);
+
+int thermal_register_governor(struct thermal_governor *);
+void thermal_unregister_governor(struct thermal_governor *);
+
#ifdef CONFIG_NET
extern int thermal_generate_netlink_event(u32 orig, enum events event);
#else
projects / karo-tx-linux.git / commitdiff