| // 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) |
| mod_delayed_work(system_freezable_power_efficient_wq, |
| &tz->poll_queue, delay); |
| else |
| cancel_delayed_work(&tz->poll_queue); |
| } |
| |
| 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->mode != THERMAL_DEVICE_ENABLED) |
| thermal_zone_device_set_polling(tz, 0); |
| else if (tz->passive > 0) |
| 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 temp, ret; |
| |
| if (tz->suspended) |
| return; |
| |
| if (!thermal_zone_device_is_enabled(tz)) |
| 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); |
| |
| thermal_zone_set_trips(tz); |
| |
| 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); |
| |
| int thermal_zone_device_is_enabled(struct thermal_zone_device *tz) |
| { |
| lockdep_assert_held(&tz->lock); |
| |
| return tz->mode == THERMAL_DEVICE_ENABLED; |
| } |
| |
| 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 |
| * @upper: the Maximum cooling state for this trip point. |
| * THERMAL_NO_LIMIT means no upper limit, |
| * and the cooling device can be in max_state. |
| * @lower: the Minimum cooling state can be used for this trip point. |
| * THERMAL_NO_LIMIT means no lower limit, |
| * and the cooling device can be in cooling state 0. |
| * @weight: The weight of the cooling device to be bound to the |
| * thermal zone. Use THERMAL_WEIGHT_DEFAULT for the |
| * default value |
| * |
| * 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. |
| */ |
| int thermal_bind_cdev_to_trip(struct thermal_zone_device *tz, |
| const struct thermal_trip *trip, |
| struct thermal_cooling_device *cdev, |
| unsigned long upper, unsigned long lower, |
| unsigned int weight) |
| { |
| struct thermal_instance *dev; |
| struct thermal_instance *pos; |
| struct thermal_zone_device *pos1; |
| struct thermal_cooling_device *pos2; |
| bool upper_no_limit; |
| int result; |
| |
| list_for_each_entry(pos1, &thermal_tz_list, node) { |
| if (pos1 == tz) |
| break; |
| } |
| list_for_each_entry(pos2, &thermal_cdev_list, node) { |
| if (pos2 == cdev) |
| break; |
| } |
| |
| if (tz != pos1 || cdev != pos2) |
| return -EINVAL; |
| |
| /* lower default 0, upper default max_state */ |
| lower = lower == THERMAL_NO_LIMIT ? 0 : lower; |
| |
| if (upper == THERMAL_NO_LIMIT) { |
| upper = cdev->max_state; |
| upper_no_limit = true; |
| } else { |
| upper_no_limit = false; |
| } |
| |
| if (lower > upper || upper > cdev->max_state) |
| return -EINVAL; |
| |
| dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| if (!dev) |
| return -ENOMEM; |
| dev->tz = tz; |
| dev->cdev = cdev; |
| dev->trip = trip; |
| dev->upper = upper; |
| dev->upper_no_limit = upper_no_limit; |
| dev->lower = lower; |
| dev->target = THERMAL_NO_TARGET; |
| dev->weight = 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(&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) { |
| 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); |
| mutex_unlock(&tz->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; |
| } |
| EXPORT_SYMBOL_GPL(thermal_bind_cdev_to_trip); |
| |
| int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, |
| int trip_index, |
| struct thermal_cooling_device *cdev, |
| unsigned long upper, unsigned long lower, |
| unsigned int weight) |
| { |
| if (trip_index < 0 || trip_index >= tz->num_trips) |
| return -EINVAL; |
| |
| return thermal_bind_cdev_to_trip(tz, &tz->trips[trip_index].trip, cdev, |
| upper, lower, weight); |
| } |
| EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device); |
| |
| /** |
| * 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. |
| * |
| * Return: 0 on success, the proper error value otherwise. |
| */ |
| int 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(&tz->lock); |
| mutex_lock(&cdev->lock); |
| list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) { |
| if (pos->tz == tz && 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); |
| mutex_unlock(&tz->lock); |
| goto unbind; |
| } |
| } |
| mutex_unlock(&cdev->lock); |
| mutex_unlock(&tz->lock); |
| |
| return -ENODEV; |
| |
| 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); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(thermal_unbind_cdev_from_trip); |
| |
| int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz, |
| int trip_index, |
| struct thermal_cooling_device *cdev) |
| { |
| if (trip_index < 0 || trip_index >= tz->num_trips) |
| return -EINVAL; |
| |
| return thermal_unbind_cdev_from_trip(tz, &tz->trips[trip_index].trip, cdev); |
| } |
| EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device); |
| |
| 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, |
| 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_cdev(struct thermal_cooling_device *cdev) |
| { |
| int ret; |
| struct thermal_zone_device *pos = NULL; |
| |
| list_for_each_entry(pos, &thermal_tz_list, node) { |
| if (pos->ops.bind) { |
| ret = pos->ops.bind(pos, cdev); |
| if (ret) |
| print_bind_err_msg(pos, cdev, ret); |
| } |
| } |
| } |
| |
| /** |
| * __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 */ |
| bind_cdev(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); |
| |
| /** |
| * 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) { |
| if (tz->ops.unbind) |
| tz->ops.unbind(tz, cdev); |
| } |
| |
| mutex_unlock(&thermal_list_lock); |
| |
| device_unregister(&cdev->device); |
| } |
| EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister); |
| |
| static void bind_tz(struct thermal_zone_device *tz) |
| { |
| int ret; |
| struct thermal_cooling_device *pos = NULL; |
| |
| if (!tz->ops.bind) |
| return; |
| |
| mutex_lock(&thermal_list_lock); |
| |
| list_for_each_entry(pos, &thermal_cdev_list, node) { |
| ret = tz->ops.bind(tz, pos); |
| if (ret) |
| print_bind_err_msg(tz, pos, ret); |
| } |
| |
| mutex_unlock(&thermal_list_lock); |
| } |
| |
| static void thermal_set_delay_jiffies(unsigned long *delay_jiffies, int delay_ms) |
| { |
| *delay_jiffies = msecs_to_jiffies(delay_ms); |
| if (delay_ms > 1000) |
| *delay_jiffies = round_jiffies(*delay_jiffies); |
| } |
| |
| 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_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\n"); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| if (num_trips > 0 && !trips) |
| return ERR_PTR(-EINVAL); |
| |
| if (polling_delay) { |
| if (passive_delay > polling_delay) |
| return ERR_PTR(-EINVAL); |
| |
| if (!passive_delay) |
| passive_delay = polling_delay; |
| } |
| |
| 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; |
| } |
| |
| thermal_set_delay_jiffies(&tz->passive_delay_jiffies, passive_delay); |
| thermal_set_delay_jiffies(&tz->polling_delay_jiffies, polling_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); |
| mutex_unlock(&thermal_list_lock); |
| |
| /* Bind cooling devices for this zone */ |
| bind_tz(tz); |
| |
| 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) |
| if (tz->ops.unbind) |
| tz->ops.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); |