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|
// SPDX-License-Identifier: GPL-2.0
/*
* thermal.c - Generic Thermal Management Sysfs support.
*
* Copyright (C) 2008 Intel Corp
* Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
* Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/device.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/kdev_t.h>
#include <linux/idr.h>
#include <linux/list_sort.h>
#include <linux/thermal.h>
#include <linux/reboot.h>
#include <linux/string.h>
#include <linux/of.h>
#include <linux/suspend.h>
#define CREATE_TRACE_POINTS
#include "thermal_trace.h"
#include "thermal_core.h"
#include "thermal_hwmon.h"
static DEFINE_IDA(thermal_tz_ida);
static DEFINE_IDA(thermal_cdev_ida);
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 *def_governor;
/*
* Governor section: set of functions to handle thermal governors
*
* Functions to help in the life cycle of thermal governors within
* the thermal core and by the thermal governor code.
*/
static struct thermal_governor *__find_governor(const char *name)
{
struct thermal_governor *pos;
if (!name || !name[0])
return def_governor;
list_for_each_entry(pos, &thermal_governor_list, governor_list)
if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
return pos;
return NULL;
}
/**
* bind_previous_governor() - bind the previous governor of the thermal zone
* @tz: a valid pointer to a struct thermal_zone_device
* @failed_gov_name: the name of the governor that failed to register
*
* Register the previous governor of the thermal zone after a new
* governor has failed to be bound.
*/
static void bind_previous_governor(struct thermal_zone_device *tz,
const char *failed_gov_name)
{
if (tz->governor && tz->governor->bind_to_tz) {
if (tz->governor->bind_to_tz(tz)) {
dev_err(&tz->device,
"governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
failed_gov_name, tz->governor->name, tz->type);
tz->governor = NULL;
}
}
}
/**
* thermal_set_governor() - Switch to another governor
* @tz: a valid pointer to a struct thermal_zone_device
* @new_gov: pointer to the new governor
*
* Change the governor of thermal zone @tz.
*
* Return: 0 on success, an error if the new governor's bind_to_tz() failed.
*/
static int thermal_set_governor(struct thermal_zone_device *tz,
struct thermal_governor *new_gov)
{
int ret = 0;
if (tz->governor && tz->governor->unbind_from_tz)
tz->governor->unbind_from_tz(tz);
if (new_gov && new_gov->bind_to_tz) {
ret = new_gov->bind_to_tz(tz);
if (ret) {
bind_previous_governor(tz, new_gov->name);
return ret;
}
}
tz->governor = new_gov;
return ret;
}
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)) {
bool match_default;
err = 0;
list_add(&governor->governor_list, &thermal_governor_list);
match_default = !strncmp(governor->name,
DEFAULT_THERMAL_GOVERNOR,
THERMAL_NAME_LENGTH);
if (!def_governor && match_default)
def_governor = governor;
}
mutex_lock(&thermal_list_lock);
list_for_each_entry(pos, &thermal_tz_list, node) {
/*
* only thermal zones with specified tz->tzp->governor_name
* may run with tz->govenor unset
*/
if (pos->governor)
continue;
name = pos->tzp->governor_name;
if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
int ret;
ret = thermal_set_governor(pos, governor);
if (ret)
dev_err(&pos->device,
"Failed to set governor %s for thermal zone %s: %d\n",
governor->name, pos->type, ret);
}
}
mutex_unlock(&thermal_list_lock);
mutex_unlock(&thermal_governor_lock);
return err;
}
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))
goto exit;
mutex_lock(&thermal_list_lock);
list_for_each_entry(pos, &thermal_tz_list, node) {
if (!strncasecmp(pos->governor->name, governor->name,
THERMAL_NAME_LENGTH))
thermal_set_governor(pos, NULL);
}
mutex_unlock(&thermal_list_lock);
list_del(&governor->governor_list);
exit:
mutex_unlock(&thermal_governor_lock);
}
int thermal_zone_device_set_policy(struct thermal_zone_device *tz,
char *policy)
{
struct thermal_governor *gov;
int ret = -EINVAL;
mutex_lock(&thermal_governor_lock);
mutex_lock(&tz->lock);
gov = __find_governor(strim(policy));
if (!gov)
goto exit;
ret = thermal_set_governor(tz, gov);
exit:
mutex_unlock(&tz->lock);
mutex_unlock(&thermal_governor_lock);
thermal_notify_tz_gov_change(tz, policy);
return ret;
}
int thermal_build_list_of_policies(char *buf)
{
struct thermal_governor *pos;
ssize_t count = 0;
mutex_lock(&thermal_governor_lock);
list_for_each_entry(pos, &thermal_governor_list, governor_list) {
count += sysfs_emit_at(buf, count, "%s ", pos->name);
}
count += sysfs_emit_at(buf, count, "\n");
mutex_unlock(&thermal_governor_lock);
return count;
}
static void __init thermal_unregister_governors(void)
{
struct thermal_governor **governor;
for_each_governor_table(governor)
thermal_unregister_governor(*governor);
}
static int __init thermal_register_governors(void)
{
int ret = 0;
struct thermal_governor **governor;
for_each_governor_table(governor) {
ret = thermal_register_governor(*governor);
if (ret) {
pr_err("Failed to register governor: '%s'",
(*governor)->name);
break;
}
pr_info("Registered thermal governor '%s'",
(*governor)->name);
}
if (ret) {
struct thermal_governor **gov;
for_each_governor_table(gov) {
if (gov == governor)
break;
thermal_unregister_governor(*gov);
}
}
return ret;
}
static int __thermal_zone_device_set_mode(struct thermal_zone_device *tz,
enum thermal_device_mode mode)
{
if (tz->ops.change_mode) {
int ret;
ret = tz->ops.change_mode(tz, mode);
if (ret)
return ret;
}
tz->mode = mode;
return 0;
}
static void thermal_zone_broken_disable(struct thermal_zone_device *tz)
{
struct thermal_trip_desc *td;
dev_err(&tz->device, "Unable to get temperature, disabling!\n");
/*
* This function only runs for enabled thermal zones, so no need to
* check for the current mode.
*/
__thermal_zone_device_set_mode(tz, THERMAL_DEVICE_DISABLED);
thermal_notify_tz_disable(tz);
for_each_trip_desc(tz, td) {
if (td->trip.type == THERMAL_TRIP_CRITICAL &&
td->trip.temperature > THERMAL_TEMP_INVALID) {
dev_crit(&tz->device,
"Disabled thermal zone with critical trip point\n");
return;
}
}
}
/*
* Zone update section: main control loop applied to each zone while monitoring
* in polling mode. The monitoring is done using a workqueue.
* Same update may be done on a zone by calling thermal_zone_device_update().
*
* An update means:
* - Non-critical trips will invoke the governor responsible for that zone;
* - Hot trips will produce a notification to userspace;
* - Critical trip point will cause a system shutdown.
*/
static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
unsigned long delay)
{
if (delay > HZ)
delay = round_jiffies_relative(delay);
mod_delayed_work(system_freezable_power_efficient_wq, &tz->poll_queue, delay);
}
static void thermal_zone_recheck(struct thermal_zone_device *tz, int error)
{
if (error == -EAGAIN) {
thermal_zone_device_set_polling(tz, THERMAL_RECHECK_DELAY);
return;
}
/*
* Print the message once to reduce log noise. It will be followed by
* another one if the temperature cannot be determined after multiple
* attempts.
*/
if (tz->recheck_delay_jiffies == THERMAL_RECHECK_DELAY)
dev_info(&tz->device, "Temperature check failed (%d)\n", error);
thermal_zone_device_set_polling(tz, tz->recheck_delay_jiffies);
tz->recheck_delay_jiffies += max(tz->recheck_delay_jiffies >> 1, 1ULL);
if (tz->recheck_delay_jiffies > THERMAL_MAX_RECHECK_DELAY) {
thermal_zone_broken_disable(tz);
/*
* Restore the original recheck delay value to allow the thermal
* zone to try to recover when it is reenabled by user space.
*/
tz->recheck_delay_jiffies = THERMAL_RECHECK_DELAY;
}
}
static void monitor_thermal_zone(struct thermal_zone_device *tz)
{
if (tz->passive > 0 && tz->passive_delay_jiffies)
thermal_zone_device_set_polling(tz, tz->passive_delay_jiffies);
else if (tz->polling_delay_jiffies)
thermal_zone_device_set_polling(tz, tz->polling_delay_jiffies);
}
static struct thermal_governor *thermal_get_tz_governor(struct thermal_zone_device *tz)
{
if (tz->governor)
return tz->governor;
return def_governor;
}
void thermal_governor_update_tz(struct thermal_zone_device *tz,
enum thermal_notify_event reason)
{
if (!tz->governor || !tz->governor->update_tz)
return;
tz->governor->update_tz(tz, reason);
}
static void thermal_zone_device_halt(struct thermal_zone_device *tz, bool shutdown)
{
/*
* poweroff_delay_ms must be a carefully profiled positive value.
* Its a must for forced_emergency_poweroff_work to be scheduled.
*/
int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS;
const char *msg = "Temperature too high";
dev_emerg(&tz->device, "%s: critical temperature reached\n", tz->type);
if (shutdown)
hw_protection_shutdown(msg, poweroff_delay_ms);
else
hw_protection_reboot(msg, poweroff_delay_ms);
}
void thermal_zone_device_critical(struct thermal_zone_device *tz)
{
thermal_zone_device_halt(tz, true);
}
EXPORT_SYMBOL(thermal_zone_device_critical);
void thermal_zone_device_critical_reboot(struct thermal_zone_device *tz)
{
thermal_zone_device_halt(tz, false);
}
static void handle_critical_trips(struct thermal_zone_device *tz,
const struct thermal_trip *trip)
{
trace_thermal_zone_trip(tz, thermal_zone_trip_id(tz, trip), trip->type);
if (trip->type == THERMAL_TRIP_CRITICAL)
tz->ops.critical(tz);
else if (tz->ops.hot)
tz->ops.hot(tz);
}
static void handle_thermal_trip(struct thermal_zone_device *tz,
struct thermal_trip_desc *td,
struct list_head *way_up_list,
struct list_head *way_down_list)
{
const struct thermal_trip *trip = &td->trip;
int old_threshold;
if (trip->temperature == THERMAL_TEMP_INVALID)
return;
/*
* If the trip temperature or hysteresis has been updated recently,
* the threshold needs to be computed again using the new values.
* However, its initial value still reflects the old ones and that
* is what needs to be compared with the previous zone temperature
* to decide which action to take.
*/
old_threshold = td->threshold;
td->threshold = trip->temperature;
if (tz->last_temperature >= old_threshold &&
tz->last_temperature != THERMAL_TEMP_INIT) {
/*
* Mitigation is under way, so it needs to stop if the zone
* temperature falls below the low temperature of the trip.
* In that case, the trip temperature becomes the new threshold.
*/
if (tz->temperature < trip->temperature - trip->hysteresis) {
list_add(&td->notify_list_node, way_down_list);
td->notify_temp = trip->temperature - trip->hysteresis;
if (trip->type == THERMAL_TRIP_PASSIVE) {
tz->passive--;
WARN_ON(tz->passive < 0);
}
} else {
td->threshold -= trip->hysteresis;
}
} else if (tz->temperature >= trip->temperature) {
/*
* There is no mitigation under way, so it needs to be started
* if the zone temperature exceeds the trip one. The new
* threshold is then set to the low temperature of the trip.
*/
list_add_tail(&td->notify_list_node, way_up_list);
td->notify_temp = trip->temperature;
td->threshold -= trip->hysteresis;
if (trip->type == THERMAL_TRIP_PASSIVE)
tz->passive++;
else if (trip->type == THERMAL_TRIP_CRITICAL ||
trip->type == THERMAL_TRIP_HOT)
handle_critical_trips(tz, trip);
}
}
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_EVENT_UNSPECIFIED);
}
static void thermal_zone_device_init(struct thermal_zone_device *tz)
{
struct thermal_instance *pos;
INIT_DELAYED_WORK(&tz->poll_queue, thermal_zone_device_check);
tz->temperature = THERMAL_TEMP_INIT;
tz->passive = 0;
tz->prev_low_trip = -INT_MAX;
tz->prev_high_trip = INT_MAX;
list_for_each_entry(pos, &tz->thermal_instances, tz_node)
pos->initialized = false;
}
static void thermal_governor_trip_crossed(struct thermal_governor *governor,
struct thermal_zone_device *tz,
const struct thermal_trip *trip,
bool crossed_up)
{
if (trip->type == THERMAL_TRIP_HOT || trip->type == THERMAL_TRIP_CRITICAL)
return;
if (governor->trip_crossed)
governor->trip_crossed(tz, trip, crossed_up);
}
static void thermal_trip_crossed(struct thermal_zone_device *tz,
const struct thermal_trip *trip,
struct thermal_governor *governor,
bool crossed_up)
{
if (crossed_up) {
thermal_notify_tz_trip_up(tz, trip);
thermal_debug_tz_trip_up(tz, trip);
} else {
thermal_notify_tz_trip_down(tz, trip);
thermal_debug_tz_trip_down(tz, trip);
}
thermal_governor_trip_crossed(governor, tz, trip, crossed_up);
}
static int thermal_trip_notify_cmp(void *not_used, const struct list_head *a,
const struct list_head *b)
{
struct thermal_trip_desc *tda = container_of(a, struct thermal_trip_desc,
notify_list_node);
struct thermal_trip_desc *tdb = container_of(b, struct thermal_trip_desc,
notify_list_node);
return tda->notify_temp - tdb->notify_temp;
}
void __thermal_zone_device_update(struct thermal_zone_device *tz,
enum thermal_notify_event event)
{
struct thermal_governor *governor = thermal_get_tz_governor(tz);
struct thermal_trip_desc *td;
LIST_HEAD(way_down_list);
LIST_HEAD(way_up_list);
int low = -INT_MAX, high = INT_MAX;
int temp, ret;
if (tz->suspended || tz->mode != THERMAL_DEVICE_ENABLED)
return;
ret = __thermal_zone_get_temp(tz, &temp);
if (ret) {
thermal_zone_recheck(tz, ret);
return;
} else if (temp <= THERMAL_TEMP_INVALID) {
/*
* Special case: No valid temperature value is available, but
* the zone owner does not want the core to do anything about
* it. Continue regular zone polling if needed, so that this
* function can be called again, but skip everything else.
*/
goto monitor;
}
tz->recheck_delay_jiffies = THERMAL_RECHECK_DELAY;
tz->last_temperature = tz->temperature;
tz->temperature = temp;
trace_thermal_temperature(tz);
thermal_genl_sampling_temp(tz->id, temp);
tz->notify_event = event;
for_each_trip_desc(tz, td) {
handle_thermal_trip(tz, td, &way_up_list, &way_down_list);
if (td->threshold <= tz->temperature && td->threshold > low)
low = td->threshold;
if (td->threshold >= tz->temperature && td->threshold < high)
high = td->threshold;
}
thermal_zone_set_trips(tz, low, high);
list_sort(NULL, &way_up_list, thermal_trip_notify_cmp);
list_for_each_entry(td, &way_up_list, notify_list_node)
thermal_trip_crossed(tz, &td->trip, governor, true);
list_sort(NULL, &way_down_list, thermal_trip_notify_cmp);
list_for_each_entry_reverse(td, &way_down_list, notify_list_node)
thermal_trip_crossed(tz, &td->trip, governor, false);
if (governor->manage)
governor->manage(tz);
thermal_debug_update_trip_stats(tz);
monitor:
monitor_thermal_zone(tz);
}
static int thermal_zone_device_set_mode(struct thermal_zone_device *tz,
enum thermal_device_mode mode)
{
int ret;
mutex_lock(&tz->lock);
/* do nothing if mode isn't changing */
if (mode == tz->mode) {
mutex_unlock(&tz->lock);
return 0;
}
ret = __thermal_zone_device_set_mode(tz, mode);
if (ret) {
mutex_unlock(&tz->lock);
return ret;
}
__thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
mutex_unlock(&tz->lock);
if (mode == THERMAL_DEVICE_ENABLED)
thermal_notify_tz_enable(tz);
else
thermal_notify_tz_disable(tz);
return 0;
}
int thermal_zone_device_enable(struct thermal_zone_device *tz)
{
return thermal_zone_device_set_mode(tz, THERMAL_DEVICE_ENABLED);
}
EXPORT_SYMBOL_GPL(thermal_zone_device_enable);
int thermal_zone_device_disable(struct thermal_zone_device *tz)
{
return thermal_zone_device_set_mode(tz, THERMAL_DEVICE_DISABLED);
}
EXPORT_SYMBOL_GPL(thermal_zone_device_disable);
static bool thermal_zone_is_present(struct thermal_zone_device *tz)
{
return !list_empty(&tz->node);
}
void thermal_zone_device_update(struct thermal_zone_device *tz,
enum thermal_notify_event event)
{
mutex_lock(&tz->lock);
if (thermal_zone_is_present(tz))
__thermal_zone_device_update(tz, event);
mutex_unlock(&tz->lock);
}
EXPORT_SYMBOL_GPL(thermal_zone_device_update);
void thermal_zone_trip_down(struct thermal_zone_device *tz,
const struct thermal_trip *trip)
{
thermal_trip_crossed(tz, trip, thermal_get_tz_governor(tz), false);
}
int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
void *data)
{
struct thermal_governor *gov;
int ret = 0;
mutex_lock(&thermal_governor_lock);
list_for_each_entry(gov, &thermal_governor_list, governor_list) {
ret = cb(gov, data);
if (ret)
break;
}
mutex_unlock(&thermal_governor_lock);
return ret;
}
int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
void *), void *data)
{
struct thermal_cooling_device *cdev;
int ret = 0;
mutex_lock(&thermal_list_lock);
list_for_each_entry(cdev, &thermal_cdev_list, node) {
ret = cb(cdev, data);
if (ret)
break;
}
mutex_unlock(&thermal_list_lock);
return ret;
}
int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *),
void *data)
{
struct thermal_zone_device *tz;
int ret = 0;
mutex_lock(&thermal_list_lock);
list_for_each_entry(tz, &thermal_tz_list, node) {
ret = cb(tz, data);
if (ret)
break;
}
mutex_unlock(&thermal_list_lock);
return ret;
}
struct thermal_zone_device *thermal_zone_get_by_id(int id)
{
struct thermal_zone_device *tz, *match = NULL;
mutex_lock(&thermal_list_lock);
list_for_each_entry(tz, &thermal_tz_list, node) {
if (tz->id == id) {
match = tz;
break;
}
}
mutex_unlock(&thermal_list_lock);
return match;
}
/*
* Device management section: cooling devices, zones devices, and binding
*
* Set of functions provided by the thermal core for:
* - cooling devices lifecycle: registration, unregistration,
* binding, and unbinding.
* - thermal zone devices lifecycle: registration, unregistration,
* binding, and unbinding.
*/
/**
* thermal_bind_cdev_to_trip - bind a cooling device to a thermal zone
* @tz: pointer to struct thermal_zone_device
* @trip: trip point the cooling devices is associated with in this zone.
* @cdev: pointer to struct thermal_cooling_device
* @cool_spec: cooling specification for @trip and @cdev
*
* This interface function bind a thermal cooling device to the certain trip
* point of a thermal zone device.
* This function is usually called in the thermal zone device .bind callback.
*
* Return: 0 on success, the proper error value otherwise.
*/
static int thermal_bind_cdev_to_trip(struct thermal_zone_device *tz,
const struct thermal_trip *trip,
struct thermal_cooling_device *cdev,
struct cooling_spec *cool_spec)
{
struct thermal_instance *dev;
struct thermal_instance *pos;
bool upper_no_limit;
int result;
/* lower default 0, upper default max_state */
if (cool_spec->lower == THERMAL_NO_LIMIT)
cool_spec->lower = 0;
if (cool_spec->upper == THERMAL_NO_LIMIT) {
cool_spec->upper = cdev->max_state;
upper_no_limit = true;
} else {
upper_no_limit = false;
}
if (cool_spec->lower > cool_spec->upper || cool_spec->upper > cdev->max_state)
return -EINVAL;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
dev->cdev = cdev;
dev->trip = trip;
dev->upper = cool_spec->upper;
dev->upper_no_limit = upper_no_limit;
dev->lower = cool_spec->lower;
dev->target = THERMAL_NO_TARGET;
dev->weight = cool_spec->weight;
result = ida_alloc(&tz->ida, GFP_KERNEL);
if (result < 0)
goto free_mem;
dev->id = result;
sprintf(dev->name, "cdev%d", dev->id);
result =
sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
if (result)
goto release_ida;
snprintf(dev->attr_name, sizeof(dev->attr_name), "cdev%d_trip_point",
dev->id);
sysfs_attr_init(&dev->attr.attr);
dev->attr.attr.name = dev->attr_name;
dev->attr.attr.mode = 0444;
dev->attr.show = trip_point_show;
result = device_create_file(&tz->device, &dev->attr);
if (result)
goto remove_symbol_link;
snprintf(dev->weight_attr_name, sizeof(dev->weight_attr_name),
"cdev%d_weight", dev->id);
sysfs_attr_init(&dev->weight_attr.attr);
dev->weight_attr.attr.name = dev->weight_attr_name;
dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
dev->weight_attr.show = weight_show;
dev->weight_attr.store = weight_store;
result = device_create_file(&tz->device, &dev->weight_attr);
if (result)
goto remove_trip_file;
mutex_lock(&cdev->lock);
list_for_each_entry(pos, &tz->thermal_instances, tz_node)
if (pos->trip == trip && pos->cdev == cdev) {
result = -EEXIST;
break;
}
if (!result) {
list_add_tail(&dev->tz_node, &tz->thermal_instances);
list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
atomic_set(&tz->need_update, 1);
thermal_governor_update_tz(tz, THERMAL_TZ_BIND_CDEV);
}
mutex_unlock(&cdev->lock);
if (!result)
return 0;
device_remove_file(&tz->device, &dev->weight_attr);
remove_trip_file:
device_remove_file(&tz->device, &dev->attr);
remove_symbol_link:
sysfs_remove_link(&tz->device.kobj, dev->name);
release_ida:
ida_free(&tz->ida, dev->id);
free_mem:
kfree(dev);
return result;
}
/**
* thermal_unbind_cdev_from_trip - unbind a cooling device from a thermal zone.
* @tz: pointer to a struct thermal_zone_device.
* @trip: trip point the cooling devices is associated with in this zone.
* @cdev: pointer to a struct thermal_cooling_device.
*
* This interface function unbind a thermal cooling device from the certain
* trip point of a thermal zone device.
* This function is usually called in the thermal zone device .unbind callback.
*/
static void thermal_unbind_cdev_from_trip(struct thermal_zone_device *tz,
const struct thermal_trip *trip,
struct thermal_cooling_device *cdev)
{
struct thermal_instance *pos, *next;
mutex_lock(&cdev->lock);
list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
if (pos->trip == trip && pos->cdev == cdev) {
list_del(&pos->tz_node);
list_del(&pos->cdev_node);
thermal_governor_update_tz(tz, THERMAL_TZ_UNBIND_CDEV);
mutex_unlock(&cdev->lock);
goto unbind;
}
}
mutex_unlock(&cdev->lock);
return;
unbind:
device_remove_file(&tz->device, &pos->weight_attr);
device_remove_file(&tz->device, &pos->attr);
sysfs_remove_link(&tz->device.kobj, pos->name);
ida_free(&tz->ida, pos->id);
kfree(pos);
}
static void thermal_release(struct device *dev)
{
struct thermal_zone_device *tz;
struct thermal_cooling_device *cdev;
if (!strncmp(dev_name(dev), "thermal_zone",
sizeof("thermal_zone") - 1)) {
tz = to_thermal_zone(dev);
thermal_zone_destroy_device_groups(tz);
mutex_destroy(&tz->lock);
complete(&tz->removal);
} else if (!strncmp(dev_name(dev), "cooling_device",
sizeof("cooling_device") - 1)) {
cdev = to_cooling_device(dev);
thermal_cooling_device_destroy_sysfs(cdev);
kfree_const(cdev->type);
ida_free(&thermal_cdev_ida, cdev->id);
kfree(cdev);
}
}
static struct class *thermal_class;
static inline
void print_bind_err_msg(struct thermal_zone_device *tz,
const struct thermal_trip *trip,
struct thermal_cooling_device *cdev, int ret)
{
dev_err(&tz->device, "binding cdev %s to trip %d failed: %d\n",
cdev->type, thermal_zone_trip_id(tz, trip), ret);
}
static void thermal_zone_cdev_bind(struct thermal_zone_device *tz,
struct thermal_cooling_device *cdev)
{
struct thermal_trip_desc *td;
if (!tz->ops.should_bind)
return;
mutex_lock(&tz->lock);
for_each_trip_desc(tz, td) {
struct thermal_trip *trip = &td->trip;
struct cooling_spec c = {
.upper = THERMAL_NO_LIMIT,
.lower = THERMAL_NO_LIMIT,
.weight = THERMAL_WEIGHT_DEFAULT
};
int ret;
if (!tz->ops.should_bind(tz, trip, cdev, &c))
continue;
ret = thermal_bind_cdev_to_trip(tz, trip, cdev, &c);
if (ret)
print_bind_err_msg(tz, trip, cdev, ret);
}
mutex_unlock(&tz->lock);
}
/**
* __thermal_cooling_device_register() - register a new thermal cooling device
* @np: a pointer to a device tree node.
* @type: the thermal cooling device type.
* @devdata: device private data.
* @ops: standard thermal cooling devices callbacks.
*
* This interface function adds a new thermal cooling device (fan/processor/...)
* to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
* to all the thermal zone devices registered at the same time.
* It also gives the opportunity to link the cooling device to a device tree
* node, so that it can be bound to a thermal zone created out of device tree.
*
* Return: a pointer to the created struct thermal_cooling_device or an
* ERR_PTR. Caller must check return value with IS_ERR*() helpers.
*/
static struct thermal_cooling_device *
__thermal_cooling_device_register(struct device_node *np,
const char *type, void *devdata,
const struct thermal_cooling_device_ops *ops)
{
struct thermal_cooling_device *cdev;
struct thermal_zone_device *pos = NULL;
unsigned long current_state;
int id, ret;
if (!ops || !ops->get_max_state || !ops->get_cur_state ||
!ops->set_cur_state)
return ERR_PTR(-EINVAL);
if (!thermal_class)
return ERR_PTR(-ENODEV);
cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
if (!cdev)
return ERR_PTR(-ENOMEM);
ret = ida_alloc(&thermal_cdev_ida, GFP_KERNEL);
if (ret < 0)
goto out_kfree_cdev;
cdev->id = ret;
id = ret;
cdev->type = kstrdup_const(type ? type : "", GFP_KERNEL);
if (!cdev->type) {
ret = -ENOMEM;
goto out_ida_remove;
}
mutex_init(&cdev->lock);
INIT_LIST_HEAD(&cdev->thermal_instances);
cdev->np = np;
cdev->ops = ops;
cdev->updated = false;
cdev->device.class = thermal_class;
cdev->devdata = devdata;
ret = cdev->ops->get_max_state(cdev, &cdev->max_state);
if (ret)
goto out_cdev_type;
/*
* The cooling device's current state is only needed for debug
* initialization below, so a failure to get it does not cause
* the entire cooling device initialization to fail. However,
* the debug will not work for the device if its initial state
* cannot be determined and drivers are responsible for ensuring
* that this will not happen.
*/
ret = cdev->ops->get_cur_state(cdev, ¤t_state);
if (ret)
current_state = ULONG_MAX;
thermal_cooling_device_setup_sysfs(cdev);
ret = dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
if (ret)
goto out_cooling_dev;
ret = device_register(&cdev->device);
if (ret) {
/* thermal_release() handles rest of the cleanup */
put_device(&cdev->device);
return ERR_PTR(ret);
}
if (current_state <= cdev->max_state)
thermal_debug_cdev_add(cdev, current_state);
/* Add 'this' new cdev to the global cdev list */
mutex_lock(&thermal_list_lock);
list_add(&cdev->node, &thermal_cdev_list);
/* Update binding information for 'this' new cdev */
list_for_each_entry(pos, &thermal_tz_list, node)
thermal_zone_cdev_bind(pos, cdev);
list_for_each_entry(pos, &thermal_tz_list, node)
if (atomic_cmpxchg(&pos->need_update, 1, 0))
thermal_zone_device_update(pos,
THERMAL_EVENT_UNSPECIFIED);
mutex_unlock(&thermal_list_lock);
return cdev;
out_cooling_dev:
thermal_cooling_device_destroy_sysfs(cdev);
out_cdev_type:
kfree_const(cdev->type);
out_ida_remove:
ida_free(&thermal_cdev_ida, id);
out_kfree_cdev:
kfree(cdev);
return ERR_PTR(ret);
}
/**
* thermal_cooling_device_register() - register a new thermal cooling device
* @type: the thermal cooling device type.
* @devdata: device private data.
* @ops: standard thermal cooling devices callbacks.
*
* This interface function adds a new thermal cooling device (fan/processor/...)
* to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
* to all the thermal zone devices registered at the same time.
*
* Return: a pointer to the created struct thermal_cooling_device or an
* ERR_PTR. Caller must check return value with IS_ERR*() helpers.
*/
struct thermal_cooling_device *
thermal_cooling_device_register(const char *type, void *devdata,
const struct thermal_cooling_device_ops *ops)
{
return __thermal_cooling_device_register(NULL, type, devdata, ops);
}
EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
/**
* thermal_of_cooling_device_register() - register an OF thermal cooling device
* @np: a pointer to a device tree node.
* @type: the thermal cooling device type.
* @devdata: device private data.
* @ops: standard thermal cooling devices callbacks.
*
* This function will register a cooling device with device tree node reference.
* This interface function adds a new thermal cooling device (fan/processor/...)
* to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
* to all the thermal zone devices registered at the same time.
*
* Return: a pointer to the created struct thermal_cooling_device or an
* ERR_PTR. Caller must check return value with IS_ERR*() helpers.
*/
struct thermal_cooling_device *
thermal_of_cooling_device_register(struct device_node *np,
const char *type, void *devdata,
const struct thermal_cooling_device_ops *ops)
{
return __thermal_cooling_device_register(np, type, devdata, ops);
}
EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
static void thermal_cooling_device_release(struct device *dev, void *res)
{
thermal_cooling_device_unregister(
*(struct thermal_cooling_device **)res);
}
/**
* devm_thermal_of_cooling_device_register() - register an OF thermal cooling
* device
* @dev: a valid struct device pointer of a sensor device.
* @np: a pointer to a device tree node.
* @type: the thermal cooling device type.
* @devdata: device private data.
* @ops: standard thermal cooling devices callbacks.
*
* This function will register a cooling device with device tree node reference.
* This interface function adds a new thermal cooling device (fan/processor/...)
* to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
* to all the thermal zone devices registered at the same time.
*
* Return: a pointer to the created struct thermal_cooling_device or an
* ERR_PTR. Caller must check return value with IS_ERR*() helpers.
*/
struct thermal_cooling_device *
devm_thermal_of_cooling_device_register(struct device *dev,
struct device_node *np,
const char *type, void *devdata,
const struct thermal_cooling_device_ops *ops)
{
struct thermal_cooling_device **ptr, *tcd;
ptr = devres_alloc(thermal_cooling_device_release, sizeof(*ptr),
GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
tcd = __thermal_cooling_device_register(np, type, devdata, ops);
if (IS_ERR(tcd)) {
devres_free(ptr);
return tcd;
}
*ptr = tcd;
devres_add(dev, ptr);
return tcd;
}
EXPORT_SYMBOL_GPL(devm_thermal_of_cooling_device_register);
static bool thermal_cooling_device_present(struct thermal_cooling_device *cdev)
{
struct thermal_cooling_device *pos = NULL;
list_for_each_entry(pos, &thermal_cdev_list, node) {
if (pos == cdev)
return true;
}
return false;
}
/**
* thermal_cooling_device_update - Update a cooling device object
* @cdev: Target cooling device.
*
* Update @cdev to reflect a change of the underlying hardware or platform.
*
* Must be called when the maximum cooling state of @cdev becomes invalid and so
* its .get_max_state() callback needs to be run to produce the new maximum
* cooling state value.
*/
void thermal_cooling_device_update(struct thermal_cooling_device *cdev)
{
struct thermal_instance *ti;
unsigned long state;
if (IS_ERR_OR_NULL(cdev))
return;
/*
* Hold thermal_list_lock throughout the update to prevent the device
* from going away while being updated.
*/
mutex_lock(&thermal_list_lock);
if (!thermal_cooling_device_present(cdev))
goto unlock_list;
/*
* Update under the cdev lock to prevent the state from being set beyond
* the new limit concurrently.
*/
mutex_lock(&cdev->lock);
if (cdev->ops->get_max_state(cdev, &cdev->max_state))
goto unlock;
thermal_cooling_device_stats_reinit(cdev);
list_for_each_entry(ti, &cdev->thermal_instances, cdev_node) {
if (ti->upper == cdev->max_state)
continue;
if (ti->upper < cdev->max_state) {
if (ti->upper_no_limit)
ti->upper = cdev->max_state;
continue;
}
ti->upper = cdev->max_state;
if (ti->lower > ti->upper)
ti->lower = ti->upper;
if (ti->target == THERMAL_NO_TARGET)
continue;
if (ti->target > ti->upper)
ti->target = ti->upper;
}
if (cdev->ops->get_cur_state(cdev, &state) || state > cdev->max_state)
goto unlock;
thermal_cooling_device_stats_update(cdev, state);
unlock:
mutex_unlock(&cdev->lock);
unlock_list:
mutex_unlock(&thermal_list_lock);
}
EXPORT_SYMBOL_GPL(thermal_cooling_device_update);
static void thermal_zone_cdev_unbind(struct thermal_zone_device *tz,
struct thermal_cooling_device *cdev)
{
struct thermal_trip_desc *td;
mutex_lock(&tz->lock);
for_each_trip_desc(tz, td)
thermal_unbind_cdev_from_trip(tz, &td->trip, cdev);
mutex_unlock(&tz->lock);
}
/**
* thermal_cooling_device_unregister - removes a thermal cooling device
* @cdev: the thermal cooling device to remove.
*
* thermal_cooling_device_unregister() must be called when a registered
* thermal cooling device is no longer needed.
*/
void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
{
struct thermal_zone_device *tz;
if (!cdev)
return;
thermal_debug_cdev_remove(cdev);
mutex_lock(&thermal_list_lock);
if (!thermal_cooling_device_present(cdev)) {
mutex_unlock(&thermal_list_lock);
return;
}
list_del(&cdev->node);
/* Unbind all thermal zones associated with 'this' cdev */
list_for_each_entry(tz, &thermal_tz_list, node)
thermal_zone_cdev_unbind(tz, cdev);
mutex_unlock(&thermal_list_lock);
device_unregister(&cdev->device);
}
EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
int thermal_zone_get_crit_temp(struct thermal_zone_device *tz, int *temp)
{
const struct thermal_trip_desc *td;
int ret = -EINVAL;
if (tz->ops.get_crit_temp)
return tz->ops.get_crit_temp(tz, temp);
mutex_lock(&tz->lock);
for_each_trip_desc(tz, td) {
const struct thermal_trip *trip = &td->trip;
if (trip->type == THERMAL_TRIP_CRITICAL) {
*temp = trip->temperature;
ret = 0;
break;
}
}
mutex_unlock(&tz->lock);
return ret;
}
EXPORT_SYMBOL_GPL(thermal_zone_get_crit_temp);
/**
* thermal_zone_device_register_with_trips() - register a new thermal zone device
* @type: the thermal zone device type
* @trips: a pointer to an array of thermal trips
* @num_trips: the number of trip points the thermal zone support
* @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
* whether trip points have been crossed (0 for interrupt
* driven systems)
*
* This interface function adds a new thermal zone device (sensor) to
* /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
* thermal cooling devices registered at the same time.
* thermal_zone_device_unregister() must be called when the device is no
* longer needed. The passive cooling depends on the .get_trend() return value.
*
* Return: a pointer to the created struct thermal_zone_device or an
* in case of error, an ERR_PTR. Caller must check return value with
* IS_ERR*() helpers.
*/
struct thermal_zone_device *
thermal_zone_device_register_with_trips(const char *type,
const struct thermal_trip *trips,
int num_trips, void *devdata,
const struct thermal_zone_device_ops *ops,
const struct thermal_zone_params *tzp,
unsigned int passive_delay,
unsigned int polling_delay)
{
const struct thermal_trip *trip = trips;
struct thermal_cooling_device *cdev;
struct thermal_zone_device *tz;
struct thermal_trip_desc *td;
int id;
int result;
struct thermal_governor *governor;
if (!type || strlen(type) == 0) {
pr_err("No thermal zone type defined\n");
return ERR_PTR(-EINVAL);
}
if (strlen(type) >= THERMAL_NAME_LENGTH) {
pr_err("Thermal zone name (%s) too long, should be under %d chars\n",
type, THERMAL_NAME_LENGTH);
return ERR_PTR(-EINVAL);
}
if (num_trips < 0) {
pr_err("Incorrect number of thermal trips\n");
return ERR_PTR(-EINVAL);
}
if (!ops || !ops->get_temp) {
pr_err("Thermal zone device ops not defined or invalid\n");
return ERR_PTR(-EINVAL);
}
if (num_trips > 0 && !trips)
return ERR_PTR(-EINVAL);
if (polling_delay && passive_delay > polling_delay)
return ERR_PTR(-EINVAL);
if (!thermal_class)
return ERR_PTR(-ENODEV);
tz = kzalloc(struct_size(tz, trips, num_trips), GFP_KERNEL);
if (!tz)
return ERR_PTR(-ENOMEM);
if (tzp) {
tz->tzp = kmemdup(tzp, sizeof(*tzp), GFP_KERNEL);
if (!tz->tzp) {
result = -ENOMEM;
goto free_tz;
}
}
INIT_LIST_HEAD(&tz->thermal_instances);
INIT_LIST_HEAD(&tz->node);
ida_init(&tz->ida);
mutex_init(&tz->lock);
init_completion(&tz->removal);
init_completion(&tz->resume);
id = ida_alloc(&thermal_tz_ida, GFP_KERNEL);
if (id < 0) {
result = id;
goto free_tzp;
}
tz->id = id;
strscpy(tz->type, type, sizeof(tz->type));
tz->ops = *ops;
if (!tz->ops.critical)
tz->ops.critical = thermal_zone_device_critical;
tz->device.class = thermal_class;
tz->devdata = devdata;
tz->num_trips = num_trips;
for_each_trip_desc(tz, td) {
td->trip = *trip++;
/*
* Mark all thresholds as invalid to start with even though
* this only matters for the trips that start as invalid and
* become valid later.
*/
td->threshold = INT_MAX;
}
tz->polling_delay_jiffies = msecs_to_jiffies(polling_delay);
tz->passive_delay_jiffies = msecs_to_jiffies(passive_delay);
tz->recheck_delay_jiffies = THERMAL_RECHECK_DELAY;
/* sys I/F */
/* Add nodes that are always present via .groups */
result = thermal_zone_create_device_groups(tz);
if (result)
goto remove_id;
/* A new thermal zone needs to be updated anyway. */
atomic_set(&tz->need_update, 1);
result = dev_set_name(&tz->device, "thermal_zone%d", tz->id);
if (result) {
thermal_zone_destroy_device_groups(tz);
goto remove_id;
}
result = device_register(&tz->device);
if (result)
goto release_device;
/* Update 'this' zone's governor information */
mutex_lock(&thermal_governor_lock);
if (tz->tzp)
governor = __find_governor(tz->tzp->governor_name);
else
governor = def_governor;
result = thermal_set_governor(tz, governor);
if (result) {
mutex_unlock(&thermal_governor_lock);
goto unregister;
}
mutex_unlock(&thermal_governor_lock);
if (!tz->tzp || !tz->tzp->no_hwmon) {
result = thermal_add_hwmon_sysfs(tz);
if (result)
goto unregister;
}
mutex_lock(&thermal_list_lock);
mutex_lock(&tz->lock);
list_add_tail(&tz->node, &thermal_tz_list);
mutex_unlock(&tz->lock);
/* Bind cooling devices for this zone */
list_for_each_entry(cdev, &thermal_cdev_list, node)
thermal_zone_cdev_bind(tz, cdev);
mutex_unlock(&thermal_list_lock);
thermal_zone_device_init(tz);
/* Update the new thermal zone and mark it as already updated. */
if (atomic_cmpxchg(&tz->need_update, 1, 0))
thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
thermal_notify_tz_create(tz);
thermal_debug_tz_add(tz);
return tz;
unregister:
device_del(&tz->device);
release_device:
put_device(&tz->device);
remove_id:
ida_free(&thermal_tz_ida, id);
free_tzp:
kfree(tz->tzp);
free_tz:
kfree(tz);
return ERR_PTR(result);
}
EXPORT_SYMBOL_GPL(thermal_zone_device_register_with_trips);
struct thermal_zone_device *thermal_tripless_zone_device_register(
const char *type,
void *devdata,
const struct thermal_zone_device_ops *ops,
const struct thermal_zone_params *tzp)
{
return thermal_zone_device_register_with_trips(type, NULL, 0, devdata,
ops, tzp, 0, 0);
}
EXPORT_SYMBOL_GPL(thermal_tripless_zone_device_register);
void *thermal_zone_device_priv(struct thermal_zone_device *tzd)
{
return tzd->devdata;
}
EXPORT_SYMBOL_GPL(thermal_zone_device_priv);
const char *thermal_zone_device_type(struct thermal_zone_device *tzd)
{
return tzd->type;
}
EXPORT_SYMBOL_GPL(thermal_zone_device_type);
int thermal_zone_device_id(struct thermal_zone_device *tzd)
{
return tzd->id;
}
EXPORT_SYMBOL_GPL(thermal_zone_device_id);
struct device *thermal_zone_device(struct thermal_zone_device *tzd)
{
return &tzd->device;
}
EXPORT_SYMBOL_GPL(thermal_zone_device);
/**
* thermal_zone_device_unregister - removes the registered thermal zone device
* @tz: the thermal zone device to remove
*/
void thermal_zone_device_unregister(struct thermal_zone_device *tz)
{
struct thermal_cooling_device *cdev;
struct thermal_zone_device *pos = NULL;
if (!tz)
return;
thermal_debug_tz_remove(tz);
mutex_lock(&thermal_list_lock);
list_for_each_entry(pos, &thermal_tz_list, node)
if (pos == tz)
break;
if (pos != tz) {
/* thermal zone device not found */
mutex_unlock(&thermal_list_lock);
return;
}
mutex_lock(&tz->lock);
list_del(&tz->node);
mutex_unlock(&tz->lock);
/* Unbind all cdevs associated with 'this' thermal zone */
list_for_each_entry(cdev, &thermal_cdev_list, node)
thermal_zone_cdev_unbind(tz, cdev);
mutex_unlock(&thermal_list_lock);
cancel_delayed_work_sync(&tz->poll_queue);
thermal_set_governor(tz, NULL);
thermal_remove_hwmon_sysfs(tz);
ida_free(&thermal_tz_ida, tz->id);
ida_destroy(&tz->ida);
device_del(&tz->device);
kfree(tz->tzp);
put_device(&tz->device);
thermal_notify_tz_delete(tz);
wait_for_completion(&tz->removal);
kfree(tz);
}
EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
/**
* thermal_zone_get_zone_by_name() - search for a zone and returns its ref
* @name: thermal zone name to fetch the temperature
*
* When only one zone is found with the passed name, returns a reference to it.
*
* Return: On success returns a reference to an unique thermal zone with
* matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
* paramenters, -ENODEV for not found and -EEXIST for multiple matches).
*/
struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
{
struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
unsigned int found = 0;
if (!name)
goto exit;
mutex_lock(&thermal_list_lock);
list_for_each_entry(pos, &thermal_tz_list, node)
if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
found++;
ref = pos;
}
mutex_unlock(&thermal_list_lock);
/* nothing has been found, thus an error code for it */
if (found == 0)
ref = ERR_PTR(-ENODEV);
else if (found > 1)
/* Success only when an unique zone is found */
ref = ERR_PTR(-EEXIST);
exit:
return ref;
}
EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
static void thermal_zone_device_resume(struct work_struct *work)
{
struct thermal_zone_device *tz;
tz = container_of(work, struct thermal_zone_device, poll_queue.work);
mutex_lock(&tz->lock);
tz->suspended = false;
thermal_debug_tz_resume(tz);
thermal_zone_device_init(tz);
thermal_governor_update_tz(tz, THERMAL_TZ_RESUME);
__thermal_zone_device_update(tz, THERMAL_TZ_RESUME);
complete(&tz->resume);
tz->resuming = false;
mutex_unlock(&tz->lock);
}
static int thermal_pm_notify(struct notifier_block *nb,
unsigned long mode, void *_unused)
{
struct thermal_zone_device *tz;
switch (mode) {
case PM_HIBERNATION_PREPARE:
case PM_RESTORE_PREPARE:
case PM_SUSPEND_PREPARE:
mutex_lock(&thermal_list_lock);
list_for_each_entry(tz, &thermal_tz_list, node) {
mutex_lock(&tz->lock);
if (tz->resuming) {
/*
* thermal_zone_device_resume() queued up for
* this zone has not acquired the lock yet, so
* release it to let the function run and wait
* util it has done the work.
*/
mutex_unlock(&tz->lock);
wait_for_completion(&tz->resume);
mutex_lock(&tz->lock);
}
tz->suspended = true;
mutex_unlock(&tz->lock);
}
mutex_unlock(&thermal_list_lock);
break;
case PM_POST_HIBERNATION:
case PM_POST_RESTORE:
case PM_POST_SUSPEND:
mutex_lock(&thermal_list_lock);
list_for_each_entry(tz, &thermal_tz_list, node) {
mutex_lock(&tz->lock);
cancel_delayed_work(&tz->poll_queue);
reinit_completion(&tz->resume);
tz->resuming = true;
/*
* Replace the work function with the resume one, which
* will restore the original work function and schedule
* the polling work if needed.
*/
INIT_DELAYED_WORK(&tz->poll_queue,
thermal_zone_device_resume);
/* Queue up the work without a delay. */
mod_delayed_work(system_freezable_power_efficient_wq,
&tz->poll_queue, 0);
mutex_unlock(&tz->lock);
}
mutex_unlock(&thermal_list_lock);
break;
default:
break;
}
return 0;
}
static struct notifier_block thermal_pm_nb = {
.notifier_call = thermal_pm_notify,
/*
* Run at the lowest priority to avoid interference between the thermal
* zone resume work items spawned by thermal_pm_notify() and the other
* PM notifiers.
*/
.priority = INT_MIN,
};
static int __init thermal_init(void)
{
int result;
thermal_debug_init();
result = thermal_netlink_init();
if (result)
goto error;
result = thermal_register_governors();
if (result)
goto unregister_netlink;
thermal_class = kzalloc(sizeof(*thermal_class), GFP_KERNEL);
if (!thermal_class) {
result = -ENOMEM;
goto unregister_governors;
}
thermal_class->name = "thermal";
thermal_class->dev_release = thermal_release;
result = class_register(thermal_class);
if (result) {
kfree(thermal_class);
thermal_class = NULL;
goto unregister_governors;
}
result = register_pm_notifier(&thermal_pm_nb);
if (result)
pr_warn("Thermal: Can not register suspend notifier, return %d\n",
result);
return 0;
unregister_governors:
thermal_unregister_governors();
unregister_netlink:
thermal_netlink_exit();
error:
mutex_destroy(&thermal_list_lock);
mutex_destroy(&thermal_governor_lock);
return result;
}
postcore_initcall(thermal_init);
|