1594 строки
40 KiB
C
1594 строки
40 KiB
C
// 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 <rui.zhang@intel.com>
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* Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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 "thermal_trace.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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* 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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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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if (!device_is_registered(&tz->device))
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goto exit;
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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 += sysfs_emit_at(buf, count, "%s ", pos->name);
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}
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count += sysfs_emit_at(buf, 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 void monitor_thermal_zone(struct thermal_zone_device *tz)
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{
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if (tz->mode != THERMAL_DEVICE_ENABLED)
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thermal_zone_device_set_polling(tz, 0);
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else if (tz->passive)
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thermal_zone_device_set_polling(tz, tz->passive_delay_jiffies);
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else if (tz->polling_delay_jiffies)
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thermal_zone_device_set_polling(tz, tz->polling_delay_jiffies);
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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, int trip_temp, enum thermal_trip_type trip_type)
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{
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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_id)
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{
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struct thermal_trip trip;
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/* Ignore disabled trip points */
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if (test_bit(trip_id, &tz->trips_disabled) ||
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trip.temperature == THERMAL_TEMP_INVALID)
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return;
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__thermal_zone_get_trip(tz, trip_id, &trip);
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if (tz->last_temperature != THERMAL_TEMP_INVALID) {
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if (tz->last_temperature < trip.temperature &&
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tz->temperature >= trip.temperature)
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thermal_notify_tz_trip_up(tz->id, trip_id,
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tz->temperature);
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if (tz->last_temperature >= trip.temperature &&
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tz->temperature < (trip.temperature - trip.hysteresis))
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thermal_notify_tz_trip_down(tz->id, trip_id,
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tz->temperature);
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}
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if (trip.type == THERMAL_TRIP_CRITICAL || trip.type == THERMAL_TRIP_HOT)
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handle_critical_trips(tz, trip_id, trip.temperature, trip.type);
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else
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handle_non_critical_trips(tz, trip_id);
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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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tz->last_temperature = tz->temperature;
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tz->temperature = temp;
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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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tz->prev_low_trip = -INT_MAX;
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tz->prev_high_trip = INT_MAX;
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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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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 (atomic_read(&in_suspend))
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return;
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if (WARN_ONCE(!tz->ops->get_temp,
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"'%s' must not be called without 'get_temp' ops set\n",
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__func__))
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return;
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if (!thermal_zone_device_is_enabled(tz))
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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->num_trips; count++)
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handle_thermal_trip(tz, count);
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monitor_thermal_zone(tz);
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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 (!device_is_registered(&tz->device)) {
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mutex_unlock(&tz->lock);
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return -ENODEV;
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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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__thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
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mutex_unlock(&tz->lock);
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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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lockdep_assert_held(&tz->lock);
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return tz->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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mutex_lock(&tz->lock);
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if (device_is_registered(&tz->device))
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__thermal_zone_device_update(tz, event);
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mutex_unlock(&tz->lock);
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}
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EXPORT_SYMBOL_GPL(thermal_zone_device_update);
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/**
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* thermal_zone_device_exec - Run a callback under the zone lock.
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* @tz: Thermal zone.
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* @cb: Callback to run.
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* @data: Data to pass to the callback.
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*/
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void thermal_zone_device_exec(struct thermal_zone_device *tz,
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void (*cb)(struct thermal_zone_device *,
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unsigned long),
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unsigned long data)
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{
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mutex_lock(&tz->lock);
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cb(tz, data);
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mutex_unlock(&tz->lock);
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}
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EXPORT_SYMBOL_GPL(thermal_zone_device_exec);
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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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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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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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mutex_lock(&thermal_list_lock);
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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_zone_bind_cooling_device() - bind a cooling device to a thermal zone
|
|
* @tz: pointer to struct thermal_zone_device
|
|
* @trip: indicates which trip point the cooling devices is
|
|
* associated with in this thermal 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_zone_bind_cooling_device(struct thermal_zone_device *tz,
|
|
int 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;
|
|
|
|
if (trip >= tz->num_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;
|
|
|
|
/* 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;
|
|
|
|
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_free(&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_free(&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);
|
|
mutex_destroy(&tz->lock);
|
|
kfree(tz);
|
|
} else if (!strncmp(dev_name(dev), "cooling_device",
|
|
sizeof("cooling_device") - 1)) {
|
|
cdev = to_cooling_device(dev);
|
|
thermal_cooling_device_destroy_sysfs(cdev);
|
|
kfree(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;
|
|
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(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;
|
|
|
|
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);
|
|
}
|
|
|
|
/* 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(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,
|
|
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;
|
|
|
|
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)
|
|
{
|
|
int i, ret = -EINVAL;
|
|
|
|
if (tz->ops->get_crit_temp)
|
|
return tz->ops->get_crit_temp(tz, temp);
|
|
|
|
if (!tz->trips)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&tz->lock);
|
|
|
|
for (i = 0; i < tz->num_trips; i++) {
|
|
if (tz->trips[i].type == THERMAL_TRIP_CRITICAL) {
|
|
*temp = tz->trips[i].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
|
|
* @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_with_trips(const char *type, struct thermal_trip *trips, int num_trips, int mask,
|
|
void *devdata, struct thermal_zone_device_ops *ops,
|
|
const struct thermal_zone_params *tzp, int passive_delay,
|
|
int polling_delay)
|
|
{
|
|
struct thermal_zone_device *tz;
|
|
int id;
|
|
int result;
|
|
int count;
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Max trip count can't exceed 31 as the "mask >> num_trips" condition.
|
|
* For example, shifting by 32 will result in compiler warning:
|
|
* warning: right shift count >= width of type [-Wshift-count- overflow]
|
|
*
|
|
* Also "mask >> num_trips" will always be true with 32 bit shift.
|
|
* E.g. mask = 0x80000000 for trip id 31 to be RW. Then
|
|
* mask >> 32 = 0x80000000
|
|
* This will result in failure for the below condition.
|
|
*
|
|
* Check will be true when the bit 31 of the mask is set.
|
|
* 32 bit shift will cause overflow of 4 byte integer.
|
|
*/
|
|
if (num_trips > (BITS_PER_TYPE(int) - 1) || num_trips < 0 || mask >> num_trips) {
|
|
pr_err("Incorrect number of thermal trips\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
if (!ops) {
|
|
pr_err("Thermal zone device ops not defined\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
if (num_trips > 0 && !trips)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (!thermal_class)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
tz = kzalloc(sizeof(*tz), 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);
|
|
ida_init(&tz->ida);
|
|
mutex_init(&tz->lock);
|
|
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));
|
|
|
|
if (!ops->critical)
|
|
ops->critical = thermal_zone_device_critical;
|
|
|
|
tz->ops = ops;
|
|
tz->device.class = thermal_class;
|
|
tz->devdata = devdata;
|
|
tz->trips = trips;
|
|
tz->num_trips = num_trips;
|
|
|
|
thermal_set_delay_jiffies(&tz->passive_delay_jiffies, passive_delay);
|
|
thermal_set_delay_jiffies(&tz->polling_delay_jiffies, polling_delay);
|
|
|
|
/* sys I/F */
|
|
/* Add nodes that are always present via .groups */
|
|
result = thermal_zone_create_device_groups(tz, mask);
|
|
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;
|
|
|
|
for (count = 0; count < num_trips; count++) {
|
|
struct thermal_trip trip;
|
|
|
|
result = thermal_zone_get_trip(tz, count, &trip);
|
|
if (result || !trip.temperature)
|
|
set_bit(count, &tz->trips_disabled);
|
|
}
|
|
|
|
/* 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);
|
|
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_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_zone_device_register(const char *type, int ntrips, int mask,
|
|
void *devdata, struct thermal_zone_device_ops *ops,
|
|
const struct thermal_zone_params *tzp, int passive_delay,
|
|
int polling_delay)
|
|
{
|
|
return thermal_zone_device_register_with_trips(type, NULL, ntrips, mask,
|
|
devdata, ops, tzp,
|
|
passive_delay, polling_delay);
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_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)
|
|
{
|
|
int tz_id;
|
|
struct thermal_cooling_device *cdev;
|
|
struct thermal_zone_device *pos = NULL;
|
|
|
|
if (!tz)
|
|
return;
|
|
|
|
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);
|
|
|
|
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);
|
|
|
|
mutex_lock(&tz->lock);
|
|
device_del(&tz->device);
|
|
mutex_unlock(&tz->lock);
|
|
|
|
kfree(tz->tzp);
|
|
|
|
put_device(&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) {
|
|
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 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);
|