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1488 lines
38 KiB
1488 lines
38 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* thermal.c - Generic Thermal Management Sysfs support. |
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* |
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* Copyright (C) 2008 Intel Corp |
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* Copyright (C) 2008 Zhang Rui <[email protected]> |
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* Copyright (C) 2008 Sujith Thomas <[email protected]> |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/export.h> |
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#include <linux/slab.h> |
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#include <linux/kdev_t.h> |
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#include <linux/idr.h> |
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#include <linux/thermal.h> |
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#include <linux/reboot.h> |
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#include <linux/string.h> |
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#include <linux/of.h> |
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#include <linux/suspend.h> |
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#define CREATE_TRACE_POINTS |
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#include <trace/events/thermal.h> |
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#include "thermal_core.h" |
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#include "thermal_hwmon.h" |
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static DEFINE_IDA(thermal_tz_ida); |
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static DEFINE_IDA(thermal_cdev_ida); |
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static LIST_HEAD(thermal_tz_list); |
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static LIST_HEAD(thermal_cdev_list); |
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static LIST_HEAD(thermal_governor_list); |
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static DEFINE_MUTEX(thermal_list_lock); |
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static DEFINE_MUTEX(thermal_governor_lock); |
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static atomic_t in_suspend; |
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static struct thermal_governor *def_governor; |
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|
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/* |
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* Governor section: set of functions to handle thermal governors |
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* |
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* Functions to help in the life cycle of thermal governors within |
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* the thermal core and by the thermal governor code. |
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*/ |
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static struct thermal_governor *__find_governor(const char *name) |
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{ |
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struct thermal_governor *pos; |
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|
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if (!name || !name[0]) |
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return def_governor; |
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list_for_each_entry(pos, &thermal_governor_list, governor_list) |
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if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH)) |
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return pos; |
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return NULL; |
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} |
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/** |
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* bind_previous_governor() - bind the previous governor of the thermal zone |
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* @tz: a valid pointer to a struct thermal_zone_device |
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* @failed_gov_name: the name of the governor that failed to register |
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* |
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* Register the previous governor of the thermal zone after a new |
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* governor has failed to be bound. |
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*/ |
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static void bind_previous_governor(struct thermal_zone_device *tz, |
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const char *failed_gov_name) |
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{ |
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if (tz->governor && tz->governor->bind_to_tz) { |
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if (tz->governor->bind_to_tz(tz)) { |
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dev_err(&tz->device, |
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"governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n", |
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failed_gov_name, tz->governor->name, tz->type); |
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tz->governor = NULL; |
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} |
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} |
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} |
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/** |
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* thermal_set_governor() - Switch to another governor |
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* @tz: a valid pointer to a struct thermal_zone_device |
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* @new_gov: pointer to the new governor |
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* |
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* Change the governor of thermal zone @tz. |
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* |
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* Return: 0 on success, an error if the new governor's bind_to_tz() failed. |
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*/ |
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static int thermal_set_governor(struct thermal_zone_device *tz, |
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struct thermal_governor *new_gov) |
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{ |
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int ret = 0; |
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if (tz->governor && tz->governor->unbind_from_tz) |
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tz->governor->unbind_from_tz(tz); |
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if (new_gov && new_gov->bind_to_tz) { |
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ret = new_gov->bind_to_tz(tz); |
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if (ret) { |
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bind_previous_governor(tz, new_gov->name); |
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return ret; |
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} |
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} |
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tz->governor = new_gov; |
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return ret; |
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} |
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int thermal_register_governor(struct thermal_governor *governor) |
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{ |
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int err; |
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const char *name; |
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struct thermal_zone_device *pos; |
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if (!governor) |
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return -EINVAL; |
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mutex_lock(&thermal_governor_lock); |
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err = -EBUSY; |
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if (!__find_governor(governor->name)) { |
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bool match_default; |
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err = 0; |
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list_add(&governor->governor_list, &thermal_governor_list); |
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match_default = !strncmp(governor->name, |
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DEFAULT_THERMAL_GOVERNOR, |
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THERMAL_NAME_LENGTH); |
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if (!def_governor && match_default) |
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def_governor = governor; |
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} |
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mutex_lock(&thermal_list_lock); |
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list_for_each_entry(pos, &thermal_tz_list, node) { |
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/* |
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* only thermal zones with specified tz->tzp->governor_name |
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* may run with tz->govenor unset |
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*/ |
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if (pos->governor) |
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continue; |
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name = pos->tzp->governor_name; |
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if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) { |
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int ret; |
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ret = thermal_set_governor(pos, governor); |
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if (ret) |
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dev_err(&pos->device, |
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"Failed to set governor %s for thermal zone %s: %d\n", |
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governor->name, pos->type, ret); |
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} |
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} |
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mutex_unlock(&thermal_list_lock); |
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mutex_unlock(&thermal_governor_lock); |
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return err; |
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} |
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void thermal_unregister_governor(struct thermal_governor *governor) |
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{ |
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struct thermal_zone_device *pos; |
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if (!governor) |
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return; |
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mutex_lock(&thermal_governor_lock); |
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if (!__find_governor(governor->name)) |
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goto exit; |
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mutex_lock(&thermal_list_lock); |
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list_for_each_entry(pos, &thermal_tz_list, node) { |
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if (!strncasecmp(pos->governor->name, governor->name, |
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THERMAL_NAME_LENGTH)) |
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thermal_set_governor(pos, NULL); |
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} |
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mutex_unlock(&thermal_list_lock); |
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list_del(&governor->governor_list); |
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exit: |
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mutex_unlock(&thermal_governor_lock); |
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} |
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int thermal_zone_device_set_policy(struct thermal_zone_device *tz, |
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char *policy) |
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{ |
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struct thermal_governor *gov; |
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int ret = -EINVAL; |
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mutex_lock(&thermal_governor_lock); |
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mutex_lock(&tz->lock); |
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gov = __find_governor(strim(policy)); |
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if (!gov) |
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goto exit; |
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ret = thermal_set_governor(tz, gov); |
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exit: |
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mutex_unlock(&tz->lock); |
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mutex_unlock(&thermal_governor_lock); |
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thermal_notify_tz_gov_change(tz->id, policy); |
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return ret; |
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} |
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int thermal_build_list_of_policies(char *buf) |
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{ |
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struct thermal_governor *pos; |
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ssize_t count = 0; |
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mutex_lock(&thermal_governor_lock); |
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list_for_each_entry(pos, &thermal_governor_list, governor_list) { |
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count += scnprintf(buf + count, PAGE_SIZE - count, "%s ", |
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pos->name); |
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} |
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count += scnprintf(buf + count, PAGE_SIZE - count, "\n"); |
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mutex_unlock(&thermal_governor_lock); |
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return count; |
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} |
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static void __init thermal_unregister_governors(void) |
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{ |
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struct thermal_governor **governor; |
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for_each_governor_table(governor) |
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thermal_unregister_governor(*governor); |
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} |
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static int __init thermal_register_governors(void) |
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{ |
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int ret = 0; |
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struct thermal_governor **governor; |
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for_each_governor_table(governor) { |
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ret = thermal_register_governor(*governor); |
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if (ret) { |
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pr_err("Failed to register governor: '%s'", |
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(*governor)->name); |
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break; |
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} |
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pr_info("Registered thermal governor '%s'", |
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(*governor)->name); |
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} |
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if (ret) { |
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struct thermal_governor **gov; |
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for_each_governor_table(gov) { |
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if (gov == governor) |
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break; |
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thermal_unregister_governor(*gov); |
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} |
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} |
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return ret; |
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} |
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/* |
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* Zone update section: main control loop applied to each zone while monitoring |
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* |
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* in polling mode. The monitoring is done using a workqueue. |
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* Same update may be done on a zone by calling thermal_zone_device_update(). |
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* |
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* An update means: |
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* - Non-critical trips will invoke the governor responsible for that zone; |
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* - Hot trips will produce a notification to userspace; |
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* - Critical trip point will cause a system shutdown. |
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*/ |
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static void thermal_zone_device_set_polling(struct thermal_zone_device *tz, |
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unsigned long delay) |
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{ |
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if (delay) |
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mod_delayed_work(system_freezable_power_efficient_wq, |
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&tz->poll_queue, delay); |
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else |
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cancel_delayed_work(&tz->poll_queue); |
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} |
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static inline bool should_stop_polling(struct thermal_zone_device *tz) |
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{ |
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return !thermal_zone_device_is_enabled(tz); |
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} |
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static void monitor_thermal_zone(struct thermal_zone_device *tz) |
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{ |
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bool stop; |
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stop = should_stop_polling(tz); |
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mutex_lock(&tz->lock); |
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if (!stop && tz->passive) |
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thermal_zone_device_set_polling(tz, tz->passive_delay_jiffies); |
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else if (!stop && tz->polling_delay_jiffies) |
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thermal_zone_device_set_polling(tz, tz->polling_delay_jiffies); |
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else |
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thermal_zone_device_set_polling(tz, 0); |
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mutex_unlock(&tz->lock); |
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} |
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static void handle_non_critical_trips(struct thermal_zone_device *tz, int trip) |
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{ |
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tz->governor ? tz->governor->throttle(tz, trip) : |
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def_governor->throttle(tz, trip); |
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} |
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void thermal_zone_device_critical(struct thermal_zone_device *tz) |
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{ |
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/* |
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* poweroff_delay_ms must be a carefully profiled positive value. |
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* Its a must for forced_emergency_poweroff_work to be scheduled. |
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*/ |
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int poweroff_delay_ms = CONFIG_THERMAL_EMERGENCY_POWEROFF_DELAY_MS; |
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dev_emerg(&tz->device, "%s: critical temperature reached, " |
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"shutting down\n", tz->type); |
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hw_protection_shutdown("Temperature too high", poweroff_delay_ms); |
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} |
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EXPORT_SYMBOL(thermal_zone_device_critical); |
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static void handle_critical_trips(struct thermal_zone_device *tz, |
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int trip, enum thermal_trip_type trip_type) |
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{ |
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int trip_temp; |
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tz->ops->get_trip_temp(tz, trip, &trip_temp); |
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/* If we have not crossed the trip_temp, we do not care. */ |
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if (trip_temp <= 0 || tz->temperature < trip_temp) |
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return; |
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trace_thermal_zone_trip(tz, trip, trip_type); |
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if (trip_type == THERMAL_TRIP_HOT && tz->ops->hot) |
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tz->ops->hot(tz); |
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else if (trip_type == THERMAL_TRIP_CRITICAL) |
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tz->ops->critical(tz); |
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} |
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static void handle_thermal_trip(struct thermal_zone_device *tz, int trip) |
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{ |
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enum thermal_trip_type type; |
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int trip_temp, hyst = 0; |
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/* Ignore disabled trip points */ |
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if (test_bit(trip, &tz->trips_disabled)) |
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return; |
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tz->ops->get_trip_temp(tz, trip, &trip_temp); |
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tz->ops->get_trip_type(tz, trip, &type); |
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if (tz->ops->get_trip_hyst) |
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tz->ops->get_trip_hyst(tz, trip, &hyst); |
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if (tz->last_temperature != THERMAL_TEMP_INVALID) { |
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if (tz->last_temperature < trip_temp && |
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tz->temperature >= trip_temp) |
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thermal_notify_tz_trip_up(tz->id, trip); |
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if (tz->last_temperature >= trip_temp && |
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tz->temperature < (trip_temp - hyst)) |
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thermal_notify_tz_trip_down(tz->id, trip); |
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} |
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if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT) |
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handle_critical_trips(tz, trip, type); |
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else |
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handle_non_critical_trips(tz, trip); |
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/* |
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* Alright, we handled this trip successfully. |
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* So, start monitoring again. |
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*/ |
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monitor_thermal_zone(tz); |
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} |
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static void update_temperature(struct thermal_zone_device *tz) |
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{ |
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int temp, ret; |
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ret = thermal_zone_get_temp(tz, &temp); |
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if (ret) { |
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if (ret != -EAGAIN) |
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dev_warn(&tz->device, |
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"failed to read out thermal zone (%d)\n", |
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ret); |
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return; |
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} |
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mutex_lock(&tz->lock); |
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tz->last_temperature = tz->temperature; |
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tz->temperature = temp; |
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mutex_unlock(&tz->lock); |
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trace_thermal_temperature(tz); |
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thermal_genl_sampling_temp(tz->id, temp); |
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} |
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static void thermal_zone_device_init(struct thermal_zone_device *tz) |
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{ |
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struct thermal_instance *pos; |
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tz->temperature = THERMAL_TEMP_INVALID; |
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list_for_each_entry(pos, &tz->thermal_instances, tz_node) |
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pos->initialized = false; |
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} |
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static int thermal_zone_device_set_mode(struct thermal_zone_device *tz, |
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enum thermal_device_mode mode) |
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{ |
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int ret = 0; |
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mutex_lock(&tz->lock); |
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/* do nothing if mode isn't changing */ |
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if (mode == tz->mode) { |
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mutex_unlock(&tz->lock); |
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return ret; |
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} |
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if (tz->ops->change_mode) |
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ret = tz->ops->change_mode(tz, mode); |
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if (!ret) |
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tz->mode = mode; |
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mutex_unlock(&tz->lock); |
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thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
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if (mode == THERMAL_DEVICE_ENABLED) |
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thermal_notify_tz_enable(tz->id); |
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else |
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thermal_notify_tz_disable(tz->id); |
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return ret; |
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} |
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int thermal_zone_device_enable(struct thermal_zone_device *tz) |
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{ |
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return thermal_zone_device_set_mode(tz, THERMAL_DEVICE_ENABLED); |
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} |
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EXPORT_SYMBOL_GPL(thermal_zone_device_enable); |
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int thermal_zone_device_disable(struct thermal_zone_device *tz) |
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{ |
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return thermal_zone_device_set_mode(tz, THERMAL_DEVICE_DISABLED); |
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} |
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EXPORT_SYMBOL_GPL(thermal_zone_device_disable); |
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int thermal_zone_device_is_enabled(struct thermal_zone_device *tz) |
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{ |
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enum thermal_device_mode mode; |
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mutex_lock(&tz->lock); |
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mode = tz->mode; |
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mutex_unlock(&tz->lock); |
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return mode == THERMAL_DEVICE_ENABLED; |
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} |
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void thermal_zone_device_update(struct thermal_zone_device *tz, |
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enum thermal_notify_event event) |
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{ |
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int count; |
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if (should_stop_polling(tz)) |
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return; |
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if (atomic_read(&in_suspend)) |
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return; |
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if (WARN_ONCE(!tz->ops->get_temp, "'%s' must not be called without " |
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"'get_temp' ops set\n", __func__)) |
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return; |
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update_temperature(tz); |
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thermal_zone_set_trips(tz); |
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tz->notify_event = event; |
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for (count = 0; count < tz->trips; count++) |
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handle_thermal_trip(tz, count); |
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} |
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EXPORT_SYMBOL_GPL(thermal_zone_device_update); |
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static void thermal_zone_device_check(struct work_struct *work) |
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{ |
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struct thermal_zone_device *tz = container_of(work, struct |
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thermal_zone_device, |
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poll_queue.work); |
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thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); |
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} |
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int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *), |
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void *data) |
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{ |
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struct thermal_governor *gov; |
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int ret = 0; |
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|
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mutex_lock(&thermal_governor_lock); |
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list_for_each_entry(gov, &thermal_governor_list, governor_list) { |
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ret = cb(gov, data); |
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if (ret) |
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break; |
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} |
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mutex_unlock(&thermal_governor_lock); |
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|
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return ret; |
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} |
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int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *, |
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void *), void *data) |
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{ |
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struct thermal_cooling_device *cdev; |
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int ret = 0; |
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|
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mutex_lock(&thermal_list_lock); |
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list_for_each_entry(cdev, &thermal_cdev_list, node) { |
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ret = cb(cdev, data); |
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if (ret) |
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break; |
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} |
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mutex_unlock(&thermal_list_lock); |
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|
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return ret; |
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} |
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int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *), |
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void *data) |
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{ |
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struct thermal_zone_device *tz; |
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int ret = 0; |
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|
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mutex_lock(&thermal_list_lock); |
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list_for_each_entry(tz, &thermal_tz_list, node) { |
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ret = cb(tz, data); |
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if (ret) |
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break; |
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} |
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mutex_unlock(&thermal_list_lock); |
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|
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return ret; |
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} |
|
|
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struct thermal_zone_device *thermal_zone_get_by_id(int id) |
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{ |
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struct thermal_zone_device *tz, *match = NULL; |
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|
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mutex_lock(&thermal_list_lock); |
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list_for_each_entry(tz, &thermal_tz_list, node) { |
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if (tz->id == id) { |
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match = tz; |
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break; |
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} |
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} |
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mutex_unlock(&thermal_list_lock); |
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|
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return match; |
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} |
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|
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/* |
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* Device management section: cooling devices, zones devices, and binding |
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* |
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* Set of functions provided by the thermal core for: |
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* - cooling devices lifecycle: registration, unregistration, |
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* binding, and unbinding. |
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* - thermal zone devices lifecycle: registration, unregistration, |
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* binding, and unbinding. |
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*/ |
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|
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/** |
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* thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone |
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* @tz: pointer to struct thermal_zone_device |
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* @trip: indicates which trip point the cooling devices is |
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* associated with in this thermal zone. |
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* @cdev: pointer to struct thermal_cooling_device |
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* @upper: the Maximum cooling state for this trip point. |
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* THERMAL_NO_LIMIT means no upper limit, |
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* and the cooling device can be in max_state. |
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* @lower: the Minimum cooling state can be used for this trip point. |
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* THERMAL_NO_LIMIT means no lower limit, |
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* and the cooling device can be in cooling state 0. |
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* @weight: The weight of the cooling device to be bound to the |
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* thermal zone. Use THERMAL_WEIGHT_DEFAULT for the |
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* default value |
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* |
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* This interface function bind a thermal cooling device to the certain trip |
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* point of a thermal zone device. |
|
* This function is usually called in the thermal zone device .bind callback. |
|
* |
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* Return: 0 on success, the proper error value otherwise. |
|
*/ |
|
int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, |
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int trip, |
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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; |
|
unsigned long max_state; |
|
int result, ret; |
|
|
|
if (trip >= tz->trips || trip < 0) |
|
return -EINVAL; |
|
|
|
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; |
|
|
|
ret = cdev->ops->get_max_state(cdev, &max_state); |
|
if (ret) |
|
return ret; |
|
|
|
/* lower default 0, upper default max_state */ |
|
lower = lower == THERMAL_NO_LIMIT ? 0 : lower; |
|
upper = upper == THERMAL_NO_LIMIT ? max_state : upper; |
|
|
|
if (lower > upper || upper > 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->lower = lower; |
|
dev->target = THERMAL_NO_TARGET; |
|
dev->weight = weight; |
|
|
|
result = ida_simple_get(&tz->ida, 0, 0, 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; |
|
|
|
sprintf(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; |
|
|
|
sprintf(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); |
|
} |
|
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_simple_remove(&tz->ida, dev->id); |
|
free_mem: |
|
kfree(dev); |
|
return result; |
|
} |
|
EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device); |
|
|
|
/** |
|
* thermal_zone_unbind_cooling_device() - unbind a cooling device from a |
|
* thermal zone. |
|
* @tz: pointer to a struct thermal_zone_device. |
|
* @trip: indicates which trip point the cooling devices is |
|
* associated with in this thermal 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_zone_unbind_cooling_device(struct thermal_zone_device *tz, |
|
int 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); |
|
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_simple_remove(&tz->ida, pos->id); |
|
kfree(pos); |
|
return 0; |
|
} |
|
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); |
|
kfree(tz); |
|
} else if (!strncmp(dev_name(dev), "cooling_device", |
|
sizeof("cooling_device") - 1)) { |
|
cdev = to_cooling_device(dev); |
|
kfree(cdev); |
|
} |
|
} |
|
|
|
static struct class thermal_class = { |
|
.name = "thermal", |
|
.dev_release = thermal_release, |
|
}; |
|
|
|
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(struct thermal_zone_device *tz, int mask, |
|
struct thermal_cooling_device *cdev, |
|
unsigned long *limits, |
|
unsigned int weight) |
|
{ |
|
int i, ret; |
|
|
|
for (i = 0; i < tz->trips; i++) { |
|
if (mask & (1 << i)) { |
|
unsigned long upper, lower; |
|
|
|
upper = THERMAL_NO_LIMIT; |
|
lower = THERMAL_NO_LIMIT; |
|
if (limits) { |
|
lower = limits[i * 2]; |
|
upper = limits[i * 2 + 1]; |
|
} |
|
ret = thermal_zone_bind_cooling_device(tz, i, cdev, |
|
upper, lower, |
|
weight); |
|
if (ret) |
|
print_bind_err_msg(tz, cdev, ret); |
|
} |
|
} |
|
} |
|
|
|
static void bind_cdev(struct thermal_cooling_device *cdev) |
|
{ |
|
int i, ret; |
|
const struct thermal_zone_params *tzp; |
|
struct thermal_zone_device *pos = NULL; |
|
|
|
mutex_lock(&thermal_list_lock); |
|
|
|
list_for_each_entry(pos, &thermal_tz_list, node) { |
|
if (!pos->tzp && !pos->ops->bind) |
|
continue; |
|
|
|
if (pos->ops->bind) { |
|
ret = pos->ops->bind(pos, cdev); |
|
if (ret) |
|
print_bind_err_msg(pos, cdev, ret); |
|
continue; |
|
} |
|
|
|
tzp = pos->tzp; |
|
if (!tzp || !tzp->tbp) |
|
continue; |
|
|
|
for (i = 0; i < tzp->num_tbps; i++) { |
|
if (tzp->tbp[i].cdev || !tzp->tbp[i].match) |
|
continue; |
|
if (tzp->tbp[i].match(pos, cdev)) |
|
continue; |
|
tzp->tbp[i].cdev = cdev; |
|
__bind(pos, tzp->tbp[i].trip_mask, cdev, |
|
tzp->tbp[i].binding_limits, |
|
tzp->tbp[i].weight); |
|
} |
|
} |
|
|
|
mutex_unlock(&thermal_list_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; |
|
int ret; |
|
|
|
if (!ops || !ops->get_max_state || !ops->get_cur_state || |
|
!ops->set_cur_state) |
|
return ERR_PTR(-EINVAL); |
|
|
|
cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); |
|
if (!cdev) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
ret = ida_simple_get(&thermal_cdev_ida, 0, 0, GFP_KERNEL); |
|
if (ret < 0) |
|
goto out_kfree_cdev; |
|
cdev->id = ret; |
|
|
|
cdev->type = kstrdup(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; |
|
thermal_cooling_device_setup_sysfs(cdev); |
|
dev_set_name(&cdev->device, "cooling_device%d", cdev->id); |
|
ret = device_register(&cdev->device); |
|
if (ret) |
|
goto out_kfree_type; |
|
|
|
/* Add 'this' new cdev to the global cdev list */ |
|
mutex_lock(&thermal_list_lock); |
|
list_add(&cdev->node, &thermal_cdev_list); |
|
mutex_unlock(&thermal_list_lock); |
|
|
|
/* Update binding information for 'this' new cdev */ |
|
bind_cdev(cdev); |
|
|
|
mutex_lock(&thermal_list_lock); |
|
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_kfree_type: |
|
kfree(cdev->type); |
|
put_device(&cdev->device); |
|
out_ida_remove: |
|
ida_simple_remove(&thermal_cdev_ida, cdev->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, |
|
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 void __unbind(struct thermal_zone_device *tz, int mask, |
|
struct thermal_cooling_device *cdev) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < tz->trips; i++) |
|
if (mask & (1 << i)) |
|
thermal_zone_unbind_cooling_device(tz, i, cdev); |
|
} |
|
|
|
/** |
|
* 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) |
|
{ |
|
int i; |
|
const struct thermal_zone_params *tzp; |
|
struct thermal_zone_device *tz; |
|
struct thermal_cooling_device *pos = NULL; |
|
|
|
if (!cdev) |
|
return; |
|
|
|
mutex_lock(&thermal_list_lock); |
|
list_for_each_entry(pos, &thermal_cdev_list, node) |
|
if (pos == cdev) |
|
break; |
|
if (pos != cdev) { |
|
/* thermal cooling device not found */ |
|
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); |
|
continue; |
|
} |
|
|
|
if (!tz->tzp || !tz->tzp->tbp) |
|
continue; |
|
|
|
tzp = tz->tzp; |
|
for (i = 0; i < tzp->num_tbps; i++) { |
|
if (tzp->tbp[i].cdev == cdev) { |
|
__unbind(tz, tzp->tbp[i].trip_mask, cdev); |
|
tzp->tbp[i].cdev = NULL; |
|
} |
|
} |
|
} |
|
|
|
mutex_unlock(&thermal_list_lock); |
|
|
|
ida_simple_remove(&thermal_cdev_ida, cdev->id); |
|
device_del(&cdev->device); |
|
thermal_cooling_device_destroy_sysfs(cdev); |
|
kfree(cdev->type); |
|
put_device(&cdev->device); |
|
} |
|
EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister); |
|
|
|
static void bind_tz(struct thermal_zone_device *tz) |
|
{ |
|
int i, ret; |
|
struct thermal_cooling_device *pos = NULL; |
|
const struct thermal_zone_params *tzp = tz->tzp; |
|
|
|
if (!tzp && !tz->ops->bind) |
|
return; |
|
|
|
mutex_lock(&thermal_list_lock); |
|
|
|
/* If there is ops->bind, try to use ops->bind */ |
|
if (tz->ops->bind) { |
|
list_for_each_entry(pos, &thermal_cdev_list, node) { |
|
ret = tz->ops->bind(tz, pos); |
|
if (ret) |
|
print_bind_err_msg(tz, pos, ret); |
|
} |
|
goto exit; |
|
} |
|
|
|
if (!tzp || !tzp->tbp) |
|
goto exit; |
|
|
|
list_for_each_entry(pos, &thermal_cdev_list, node) { |
|
for (i = 0; i < tzp->num_tbps; i++) { |
|
if (tzp->tbp[i].cdev || !tzp->tbp[i].match) |
|
continue; |
|
if (tzp->tbp[i].match(tz, pos)) |
|
continue; |
|
tzp->tbp[i].cdev = pos; |
|
__bind(tz, tzp->tbp[i].trip_mask, pos, |
|
tzp->tbp[i].binding_limits, |
|
tzp->tbp[i].weight); |
|
} |
|
} |
|
exit: |
|
mutex_unlock(&thermal_list_lock); |
|
} |
|
|
|
/** |
|
* thermal_zone_device_register() - register a new thermal zone device |
|
* @type: the thermal zone device type |
|
* @trips: the number of trip points the thermal zone support |
|
* @mask: a bit string indicating the writeablility of trip points |
|
* @devdata: private device data |
|
* @ops: standard thermal zone device callbacks |
|
* @tzp: thermal zone platform parameters |
|
* @passive_delay: number of milliseconds to wait between polls when |
|
* performing passive cooling |
|
* @polling_delay: number of milliseconds to wait between polls when checking |
|
* 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(const char *type, int trips, int mask, |
|
void *devdata, struct thermal_zone_device_ops *ops, |
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struct thermal_zone_params *tzp, int passive_delay, |
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int polling_delay) |
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{ |
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struct thermal_zone_device *tz; |
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enum thermal_trip_type trip_type; |
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int trip_temp; |
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int id; |
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int result; |
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int count; |
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struct thermal_governor *governor; |
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|
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if (!type || strlen(type) == 0) { |
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pr_err("Error: No thermal zone type defined\n"); |
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return ERR_PTR(-EINVAL); |
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} |
|
|
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if (type && strlen(type) >= THERMAL_NAME_LENGTH) { |
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pr_err("Error: Thermal zone name (%s) too long, should be under %d chars\n", |
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type, THERMAL_NAME_LENGTH); |
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return ERR_PTR(-EINVAL); |
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} |
|
|
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if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) { |
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pr_err("Error: Incorrect number of thermal trips\n"); |
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return ERR_PTR(-EINVAL); |
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} |
|
|
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if (!ops) { |
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pr_err("Error: Thermal zone device ops not defined\n"); |
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return ERR_PTR(-EINVAL); |
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} |
|
|
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if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp)) |
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return ERR_PTR(-EINVAL); |
|
|
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tz = kzalloc(sizeof(*tz), GFP_KERNEL); |
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if (!tz) |
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return ERR_PTR(-ENOMEM); |
|
|
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INIT_LIST_HEAD(&tz->thermal_instances); |
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ida_init(&tz->ida); |
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mutex_init(&tz->lock); |
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id = ida_simple_get(&thermal_tz_ida, 0, 0, GFP_KERNEL); |
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if (id < 0) { |
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result = id; |
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goto free_tz; |
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} |
|
|
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tz->id = id; |
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strlcpy(tz->type, type, sizeof(tz->type)); |
|
|
|
if (!ops->critical) |
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ops->critical = thermal_zone_device_critical; |
|
|
|
tz->ops = ops; |
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tz->tzp = tzp; |
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tz->device.class = &thermal_class; |
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tz->devdata = devdata; |
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tz->trips = trips; |
|
|
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thermal_set_delay_jiffies(&tz->passive_delay_jiffies, passive_delay); |
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thermal_set_delay_jiffies(&tz->polling_delay_jiffies, polling_delay); |
|
|
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/* sys I/F */ |
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/* Add nodes that are always present via .groups */ |
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result = thermal_zone_create_device_groups(tz, mask); |
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if (result) |
|
goto remove_id; |
|
|
|
/* A new thermal zone needs to be updated anyway. */ |
|
atomic_set(&tz->need_update, 1); |
|
|
|
dev_set_name(&tz->device, "thermal_zone%d", tz->id); |
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result = device_register(&tz->device); |
|
if (result) |
|
goto release_device; |
|
|
|
for (count = 0; count < trips; count++) { |
|
if (tz->ops->get_trip_type(tz, count, &trip_type) || |
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tz->ops->get_trip_temp(tz, count, &trip_temp) || |
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!trip_temp) |
|
set_bit(count, &tz->trips_disabled); |
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} |
|
|
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/* Update 'this' zone's governor information */ |
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mutex_lock(&thermal_governor_lock); |
|
|
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if (tz->tzp) |
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governor = __find_governor(tz->tzp->governor_name); |
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else |
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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); |
|
list_add_tail(&tz->node, &thermal_tz_list); |
|
mutex_unlock(&thermal_list_lock); |
|
|
|
/* Bind cooling devices for this zone */ |
|
bind_tz(tz); |
|
|
|
INIT_DELAYED_WORK(&tz->poll_queue, thermal_zone_device_check); |
|
|
|
thermal_zone_device_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->id, tz->type); |
|
|
|
return tz; |
|
|
|
unregister: |
|
device_del(&tz->device); |
|
release_device: |
|
put_device(&tz->device); |
|
tz = NULL; |
|
remove_id: |
|
ida_simple_remove(&thermal_tz_ida, id); |
|
free_tz: |
|
kfree(tz); |
|
return ERR_PTR(result); |
|
} |
|
EXPORT_SYMBOL_GPL(thermal_zone_device_register); |
|
|
|
/** |
|
* 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) |
|
{ |
|
int i, tz_id; |
|
const struct thermal_zone_params *tzp; |
|
struct thermal_cooling_device *cdev; |
|
struct thermal_zone_device *pos = NULL; |
|
|
|
if (!tz) |
|
return; |
|
|
|
tzp = tz->tzp; |
|
tz_id = tz->id; |
|
|
|
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; |
|
} |
|
list_del(&tz->node); |
|
|
|
/* Unbind all cdevs associated with 'this' thermal zone */ |
|
list_for_each_entry(cdev, &thermal_cdev_list, node) { |
|
if (tz->ops->unbind) { |
|
tz->ops->unbind(tz, cdev); |
|
continue; |
|
} |
|
|
|
if (!tzp || !tzp->tbp) |
|
break; |
|
|
|
for (i = 0; i < tzp->num_tbps; i++) { |
|
if (tzp->tbp[i].cdev == cdev) { |
|
__unbind(tz, tzp->tbp[i].trip_mask, cdev); |
|
tzp->tbp[i].cdev = NULL; |
|
} |
|
} |
|
} |
|
|
|
mutex_unlock(&thermal_list_lock); |
|
|
|
cancel_delayed_work_sync(&tz->poll_queue); |
|
|
|
thermal_set_governor(tz, NULL); |
|
|
|
thermal_remove_hwmon_sysfs(tz); |
|
ida_simple_remove(&thermal_tz_ida, tz->id); |
|
ida_destroy(&tz->ida); |
|
mutex_destroy(&tz->lock); |
|
device_unregister(&tz->device); |
|
|
|
thermal_notify_tz_delete(tz_id); |
|
} |
|
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 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: |
|
atomic_set(&in_suspend, 1); |
|
break; |
|
case PM_POST_HIBERNATION: |
|
case PM_POST_RESTORE: |
|
case PM_POST_SUSPEND: |
|
atomic_set(&in_suspend, 0); |
|
list_for_each_entry(tz, &thermal_tz_list, node) { |
|
if (!thermal_zone_device_is_enabled(tz)) |
|
continue; |
|
|
|
thermal_zone_device_init(tz); |
|
thermal_zone_device_update(tz, |
|
THERMAL_EVENT_UNSPECIFIED); |
|
} |
|
break; |
|
default: |
|
break; |
|
} |
|
return 0; |
|
} |
|
|
|
static struct notifier_block thermal_pm_nb = { |
|
.notifier_call = thermal_pm_notify, |
|
}; |
|
|
|
static int __init thermal_init(void) |
|
{ |
|
int result; |
|
|
|
result = thermal_netlink_init(); |
|
if (result) |
|
goto error; |
|
|
|
result = thermal_register_governors(); |
|
if (result) |
|
goto error; |
|
|
|
result = class_register(&thermal_class); |
|
if (result) |
|
goto unregister_governors; |
|
|
|
result = of_parse_thermal_zones(); |
|
if (result) |
|
goto unregister_class; |
|
|
|
result = register_pm_notifier(&thermal_pm_nb); |
|
if (result) |
|
pr_warn("Thermal: Can not register suspend notifier, return %d\n", |
|
result); |
|
|
|
return 0; |
|
|
|
unregister_class: |
|
class_unregister(&thermal_class); |
|
unregister_governors: |
|
thermal_unregister_governors(); |
|
error: |
|
ida_destroy(&thermal_tz_ida); |
|
ida_destroy(&thermal_cdev_ida); |
|
mutex_destroy(&thermal_list_lock); |
|
mutex_destroy(&thermal_governor_lock); |
|
return result; |
|
} |
|
postcore_initcall(thermal_init);
|
|
|