2012-08-16 13:41:40 +02:00
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/*
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* linux/drivers/thermal/cpu_cooling.c
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*
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* Copyright (C) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com)
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* Copyright (C) 2012 Amit Daniel <amit.kachhap@linaro.org>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/module.h>
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#include <linux/thermal.h>
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#include <linux/cpufreq.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/cpu.h>
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#include <linux/cpu_cooling.h>
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2014-12-04 05:11:49 +01:00
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/*
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* Cooling state <-> CPUFreq frequency
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*
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* Cooling states are translated to frequencies throughout this driver and this
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* is the relation between them.
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*
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* Highest cooling state corresponds to lowest possible frequency.
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*
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* i.e.
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* level 0 --> 1st Max Freq
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* level 1 --> 2nd Max Freq
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* ...
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*/
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2012-08-16 13:41:40 +02:00
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/**
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2013-04-17 19:11:56 +02:00
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* struct cpufreq_cooling_device - data for cooling device with cpufreq
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2012-08-16 13:41:40 +02:00
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* @id: unique integer value corresponding to each cpufreq_cooling_device
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* registered.
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2013-04-17 19:11:56 +02:00
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* @cool_dev: thermal_cooling_device pointer to keep track of the
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* registered cooling device.
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2012-08-16 13:41:40 +02:00
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* @cpufreq_state: integer value representing the current state of cpufreq
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* cooling devices.
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* @cpufreq_val: integer value representing the absolute value of the clipped
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* frequency.
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2014-12-04 05:12:02 +01:00
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* @max_level: maximum cooling level. One less than total number of valid
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* cpufreq frequencies.
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2012-08-16 13:41:40 +02:00
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* @allowed_cpus: all the cpus involved for this cpufreq_cooling_device.
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*
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2014-12-04 05:11:48 +01:00
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* This structure is required for keeping information of each registered
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* cpufreq_cooling_device.
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2012-08-16 13:41:40 +02:00
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*/
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struct cpufreq_cooling_device {
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int id;
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struct thermal_cooling_device *cool_dev;
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unsigned int cpufreq_state;
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unsigned int cpufreq_val;
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2014-12-04 05:12:02 +01:00
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unsigned int max_level;
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2014-12-04 05:12:06 +01:00
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unsigned int *freq_table; /* In descending order */
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2012-08-16 13:41:40 +02:00
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struct cpumask allowed_cpus;
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2014-11-07 14:42:29 +01:00
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struct list_head node;
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2012-08-16 13:41:40 +02:00
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};
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static DEFINE_IDR(cpufreq_idr);
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2012-10-30 17:48:59 +01:00
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static DEFINE_MUTEX(cooling_cpufreq_lock);
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2012-08-16 13:41:40 +02:00
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2014-11-07 14:42:29 +01:00
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static LIST_HEAD(cpufreq_dev_list);
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2012-08-16 13:41:40 +02:00
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/**
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* get_idr - function to get a unique id.
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* @idr: struct idr * handle used to create a id.
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* @id: int * value generated by this function.
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2013-04-17 19:11:59 +02:00
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*
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* This function will populate @id with an unique
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* id, using the idr API.
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*
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* Return: 0 on success, an error code on failure.
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2012-08-16 13:41:40 +02:00
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*/
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static int get_idr(struct idr *idr, int *id)
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{
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2013-02-28 02:04:46 +01:00
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int ret;
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2012-08-16 13:41:40 +02:00
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mutex_lock(&cooling_cpufreq_lock);
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2013-02-28 02:04:46 +01:00
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ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
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2012-08-16 13:41:40 +02:00
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mutex_unlock(&cooling_cpufreq_lock);
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2013-02-28 02:04:46 +01:00
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if (unlikely(ret < 0))
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return ret;
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*id = ret;
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2013-04-17 19:11:59 +02:00
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2012-08-16 13:41:40 +02:00
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return 0;
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}
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/**
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* release_idr - function to free the unique id.
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* @idr: struct idr * handle used for creating the id.
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* @id: int value representing the unique id.
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*/
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static void release_idr(struct idr *idr, int id)
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{
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mutex_lock(&cooling_cpufreq_lock);
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idr_remove(idr, id);
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mutex_unlock(&cooling_cpufreq_lock);
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}
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/* Below code defines functions to be used for cpufreq as cooling device */
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2013-04-17 19:12:01 +02:00
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/**
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2014-12-04 05:12:07 +01:00
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* get_level: Find the level for a particular frequency
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2014-12-04 05:12:05 +01:00
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* @cpufreq_dev: cpufreq_dev for which the property is required
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2014-12-04 05:12:07 +01:00
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* @freq: Frequency
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2014-12-04 05:11:47 +01:00
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*
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2014-12-04 05:12:07 +01:00
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* Return: level on success, THERMAL_CSTATE_INVALID on error.
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2013-04-17 19:12:01 +02:00
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*/
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2014-12-04 05:12:07 +01:00
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static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_dev,
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unsigned int freq)
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2012-08-16 13:41:40 +02:00
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{
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2014-12-04 05:12:07 +01:00
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unsigned long level;
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2013-02-08 06:09:32 +01:00
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2014-12-04 05:12:07 +01:00
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for (level = 0; level <= cpufreq_dev->max_level; level++) {
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if (freq == cpufreq_dev->freq_table[level])
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return level;
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2013-02-08 06:09:32 +01:00
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2014-12-04 05:12:07 +01:00
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if (freq > cpufreq_dev->freq_table[level])
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break;
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2012-08-16 13:41:40 +02:00
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}
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2013-04-17 19:11:59 +02:00
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2014-12-04 05:12:07 +01:00
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return THERMAL_CSTATE_INVALID;
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2013-02-08 06:09:32 +01:00
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}
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2013-04-17 19:12:05 +02:00
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/**
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2014-12-04 05:11:47 +01:00
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* cpufreq_cooling_get_level - for a given cpu, return the cooling level.
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2013-04-17 19:12:05 +02:00
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* @cpu: cpu for which the level is required
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* @freq: the frequency of interest
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*
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* This function will match the cooling level corresponding to the
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* requested @freq and return it.
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*
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* Return: The matched cooling level on success or THERMAL_CSTATE_INVALID
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* otherwise.
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*/
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2013-02-08 07:52:06 +01:00
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unsigned long cpufreq_cooling_get_level(unsigned int cpu, unsigned int freq)
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{
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2014-12-04 05:12:05 +01:00
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struct cpufreq_cooling_device *cpufreq_dev;
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2013-02-08 07:52:06 +01:00
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2014-12-04 05:12:05 +01:00
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mutex_lock(&cooling_cpufreq_lock);
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list_for_each_entry(cpufreq_dev, &cpufreq_dev_list, node) {
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if (cpumask_test_cpu(cpu, &cpufreq_dev->allowed_cpus)) {
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mutex_unlock(&cooling_cpufreq_lock);
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2014-12-04 05:12:07 +01:00
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return get_level(cpufreq_dev, freq);
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2014-12-04 05:12:05 +01:00
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}
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}
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mutex_unlock(&cooling_cpufreq_lock);
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2013-04-17 19:11:59 +02:00
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2014-12-04 05:12:05 +01:00
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pr_err("%s: cpu:%d not part of any cooling device\n", __func__, cpu);
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return THERMAL_CSTATE_INVALID;
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2013-02-08 07:52:06 +01:00
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}
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2013-04-17 19:11:57 +02:00
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EXPORT_SYMBOL_GPL(cpufreq_cooling_get_level);
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2013-02-08 07:52:06 +01:00
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2012-08-16 13:41:40 +02:00
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/**
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* cpufreq_thermal_notifier - notifier callback for cpufreq policy change.
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* @nb: struct notifier_block * with callback info.
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* @event: value showing cpufreq event for which this function invoked.
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* @data: callback-specific data
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2013-04-17 19:12:09 +02:00
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*
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2014-06-25 19:11:17 +02:00
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* Callback to hijack the notification on cpufreq policy transition.
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2013-04-17 19:12:09 +02:00
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* Every time there is a change in policy, we will intercept and
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* update the cpufreq policy with thermal constraints.
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*
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* Return: 0 (success)
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2012-08-16 13:41:40 +02:00
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*/
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static int cpufreq_thermal_notifier(struct notifier_block *nb,
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2013-04-17 19:12:11 +02:00
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unsigned long event, void *data)
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2012-08-16 13:41:40 +02:00
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{
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struct cpufreq_policy *policy = data;
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unsigned long max_freq = 0;
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2014-11-07 14:42:29 +01:00
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struct cpufreq_cooling_device *cpufreq_dev;
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2012-08-16 13:41:40 +02:00
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2014-11-07 14:42:29 +01:00
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if (event != CPUFREQ_ADJUST)
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2012-08-16 13:41:40 +02:00
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return 0;
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2014-11-07 14:42:29 +01:00
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mutex_lock(&cooling_cpufreq_lock);
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list_for_each_entry(cpufreq_dev, &cpufreq_dev_list, node) {
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if (!cpumask_test_cpu(policy->cpu,
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&cpufreq_dev->allowed_cpus))
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continue;
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max_freq = cpufreq_dev->cpufreq_val;
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2012-08-16 13:41:40 +02:00
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2014-11-07 14:42:29 +01:00
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if (policy->max != max_freq)
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cpufreq_verify_within_limits(policy, 0, max_freq);
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}
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mutex_unlock(&cooling_cpufreq_lock);
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2012-08-16 13:41:40 +02:00
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return 0;
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}
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2013-04-17 19:12:02 +02:00
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/* cpufreq cooling device callback functions are defined below */
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2012-08-16 13:41:40 +02:00
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/**
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* cpufreq_get_max_state - callback function to get the max cooling state.
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* @cdev: thermal cooling device pointer.
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* @state: fill this variable with the max cooling state.
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2013-04-17 19:12:12 +02:00
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*
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* Callback for the thermal cooling device to return the cpufreq
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* max cooling state.
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*
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* Return: 0 on success, an error code otherwise.
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2012-08-16 13:41:40 +02:00
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*/
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static int cpufreq_get_max_state(struct thermal_cooling_device *cdev,
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unsigned long *state)
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{
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2012-10-30 17:48:59 +01:00
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struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
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2012-08-16 13:41:40 +02:00
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2014-12-04 05:12:02 +01:00
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*state = cpufreq_device->max_level;
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return 0;
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2012-08-16 13:41:40 +02:00
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}
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/**
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* cpufreq_get_cur_state - callback function to get the current cooling state.
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* @cdev: thermal cooling device pointer.
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* @state: fill this variable with the current cooling state.
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2013-04-17 19:12:13 +02:00
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*
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* Callback for the thermal cooling device to return the cpufreq
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* current cooling state.
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*
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* Return: 0 on success, an error code otherwise.
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2012-08-16 13:41:40 +02:00
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*/
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static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev,
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unsigned long *state)
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{
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2012-10-30 17:48:59 +01:00
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struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
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2012-08-16 13:41:40 +02:00
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2012-10-30 17:48:59 +01:00
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*state = cpufreq_device->cpufreq_state;
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2013-04-17 19:11:59 +02:00
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2012-10-30 17:48:59 +01:00
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return 0;
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2012-08-16 13:41:40 +02:00
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}
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/**
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* cpufreq_set_cur_state - callback function to set the current cooling state.
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* @cdev: thermal cooling device pointer.
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* @state: set this variable to the current cooling state.
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2013-04-17 19:12:14 +02:00
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*
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* Callback for the thermal cooling device to change the cpufreq
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* current cooling state.
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*
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* Return: 0 on success, an error code otherwise.
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2012-08-16 13:41:40 +02:00
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*/
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static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
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unsigned long state)
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{
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2012-10-30 17:48:59 +01:00
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struct cpufreq_cooling_device *cpufreq_device = cdev->devdata;
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2014-12-04 05:12:00 +01:00
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unsigned int cpu = cpumask_any(&cpufreq_device->allowed_cpus);
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unsigned int clip_freq;
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2014-12-04 05:12:07 +01:00
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/* Request state should be less than max_level */
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if (WARN_ON(state > cpufreq_device->max_level))
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return -EINVAL;
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2014-12-04 05:12:00 +01:00
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/* Check if the old cooling action is same as new cooling action */
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if (cpufreq_device->cpufreq_state == state)
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return 0;
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2012-08-16 13:41:40 +02:00
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2014-12-04 05:12:07 +01:00
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clip_freq = cpufreq_device->freq_table[state];
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2014-12-04 05:12:00 +01:00
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cpufreq_device->cpufreq_state = state;
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cpufreq_device->cpufreq_val = clip_freq;
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cpufreq_update_policy(cpu);
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return 0;
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2012-08-16 13:41:40 +02:00
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}
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/* Bind cpufreq callbacks to thermal cooling device ops */
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static struct thermal_cooling_device_ops const cpufreq_cooling_ops = {
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.get_max_state = cpufreq_get_max_state,
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.get_cur_state = cpufreq_get_cur_state,
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.set_cur_state = cpufreq_set_cur_state,
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};
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/* Notifier for cpufreq policy change */
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static struct notifier_block thermal_cpufreq_notifier_block = {
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.notifier_call = cpufreq_thermal_notifier,
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};
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2014-12-04 05:12:06 +01:00
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static unsigned int find_next_max(struct cpufreq_frequency_table *table,
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unsigned int prev_max)
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{
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struct cpufreq_frequency_table *pos;
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unsigned int max = 0;
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|
|
cpufreq_for_each_valid_entry(pos, table) {
|
|
|
|
if (pos->frequency > max && pos->frequency < prev_max)
|
|
|
|
max = pos->frequency;
|
|
|
|
}
|
|
|
|
|
|
|
|
return max;
|
|
|
|
}
|
|
|
|
|
2012-08-16 13:41:40 +02:00
|
|
|
/**
|
2013-09-13 01:26:45 +02:00
|
|
|
* __cpufreq_cooling_register - helper function to create cpufreq cooling device
|
|
|
|
* @np: a valid struct device_node to the cooling device device tree node
|
2012-08-16 13:41:40 +02:00
|
|
|
* @clip_cpus: cpumask of cpus where the frequency constraints will happen.
|
2014-12-04 05:11:55 +01:00
|
|
|
* Normally this should be same as cpufreq policy->related_cpus.
|
2013-04-17 19:12:15 +02:00
|
|
|
*
|
|
|
|
* This interface function registers the cpufreq cooling device with the name
|
|
|
|
* "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
|
2013-09-13 01:26:45 +02:00
|
|
|
* cooling devices. It also gives the opportunity to link the cooling device
|
|
|
|
* with a device tree node, in order to bind it via the thermal DT code.
|
2013-04-17 19:12:15 +02:00
|
|
|
*
|
|
|
|
* Return: a valid struct thermal_cooling_device pointer on success,
|
|
|
|
* on failure, it returns a corresponding ERR_PTR().
|
2012-08-16 13:41:40 +02:00
|
|
|
*/
|
2013-09-13 01:26:45 +02:00
|
|
|
static struct thermal_cooling_device *
|
|
|
|
__cpufreq_cooling_register(struct device_node *np,
|
|
|
|
const struct cpumask *clip_cpus)
|
2012-08-16 13:41:40 +02:00
|
|
|
{
|
|
|
|
struct thermal_cooling_device *cool_dev;
|
2014-12-04 05:11:52 +01:00
|
|
|
struct cpufreq_cooling_device *cpufreq_dev;
|
2012-08-16 13:41:40 +02:00
|
|
|
char dev_name[THERMAL_NAME_LENGTH];
|
2014-12-04 05:12:02 +01:00
|
|
|
struct cpufreq_frequency_table *pos, *table;
|
2014-12-04 05:12:06 +01:00
|
|
|
unsigned int freq, i;
|
2014-12-04 05:11:55 +01:00
|
|
|
int ret;
|
2012-08-16 13:41:40 +02:00
|
|
|
|
2014-12-04 05:12:02 +01:00
|
|
|
table = cpufreq_frequency_get_table(cpumask_first(clip_cpus));
|
|
|
|
if (!table) {
|
2014-12-04 05:11:43 +01:00
|
|
|
pr_debug("%s: CPUFreq table not found\n", __func__);
|
|
|
|
return ERR_PTR(-EPROBE_DEFER);
|
|
|
|
}
|
|
|
|
|
2014-12-04 05:11:50 +01:00
|
|
|
cpufreq_dev = kzalloc(sizeof(*cpufreq_dev), GFP_KERNEL);
|
2012-08-16 13:41:40 +02:00
|
|
|
if (!cpufreq_dev)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
|
2014-12-04 05:12:02 +01:00
|
|
|
/* Find max levels */
|
|
|
|
cpufreq_for_each_valid_entry(pos, table)
|
|
|
|
cpufreq_dev->max_level++;
|
|
|
|
|
2014-12-04 05:12:06 +01:00
|
|
|
cpufreq_dev->freq_table = kmalloc(sizeof(*cpufreq_dev->freq_table) *
|
|
|
|
cpufreq_dev->max_level, GFP_KERNEL);
|
|
|
|
if (!cpufreq_dev->freq_table) {
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
cool_dev = ERR_PTR(-ENOMEM);
|
|
|
|
goto free_cdev;
|
|
|
|
}
|
|
|
|
|
2014-12-04 05:12:02 +01:00
|
|
|
/* max_level is an index, not a counter */
|
|
|
|
cpufreq_dev->max_level--;
|
|
|
|
|
2012-08-16 13:41:40 +02:00
|
|
|
cpumask_copy(&cpufreq_dev->allowed_cpus, clip_cpus);
|
|
|
|
|
|
|
|
ret = get_idr(&cpufreq_idr, &cpufreq_dev->id);
|
|
|
|
if (ret) {
|
2014-12-04 05:11:58 +01:00
|
|
|
cool_dev = ERR_PTR(ret);
|
2014-12-04 05:12:06 +01:00
|
|
|
goto free_table;
|
2012-08-16 13:41:40 +02:00
|
|
|
}
|
|
|
|
|
2013-04-17 19:12:17 +02:00
|
|
|
snprintf(dev_name, sizeof(dev_name), "thermal-cpufreq-%d",
|
|
|
|
cpufreq_dev->id);
|
2012-08-16 13:41:40 +02:00
|
|
|
|
2013-09-13 01:26:45 +02:00
|
|
|
cool_dev = thermal_of_cooling_device_register(np, dev_name, cpufreq_dev,
|
|
|
|
&cpufreq_cooling_ops);
|
2014-12-04 05:11:58 +01:00
|
|
|
if (IS_ERR(cool_dev))
|
|
|
|
goto remove_idr;
|
|
|
|
|
2014-12-04 05:12:06 +01:00
|
|
|
/* Fill freq-table in descending order of frequencies */
|
|
|
|
for (i = 0, freq = -1; i <= cpufreq_dev->max_level; i++) {
|
|
|
|
freq = find_next_max(table, freq);
|
|
|
|
cpufreq_dev->freq_table[i] = freq;
|
|
|
|
|
|
|
|
/* Warn for duplicate entries */
|
|
|
|
if (!freq)
|
|
|
|
pr_warn("%s: table has duplicate entries\n", __func__);
|
|
|
|
else
|
|
|
|
pr_debug("%s: freq:%u KHz\n", __func__, freq);
|
|
|
|
}
|
|
|
|
|
2014-12-04 05:12:07 +01:00
|
|
|
cpufreq_dev->cpufreq_val = cpufreq_dev->freq_table[0];
|
2012-08-16 13:41:40 +02:00
|
|
|
cpufreq_dev->cool_dev = cool_dev;
|
2014-12-04 05:11:51 +01:00
|
|
|
|
2012-08-16 13:41:40 +02:00
|
|
|
mutex_lock(&cooling_cpufreq_lock);
|
|
|
|
|
|
|
|
/* Register the notifier for first cpufreq cooling device */
|
2014-12-04 05:12:04 +01:00
|
|
|
if (list_empty(&cpufreq_dev_list))
|
2012-08-16 13:41:40 +02:00
|
|
|
cpufreq_register_notifier(&thermal_cpufreq_notifier_block,
|
2013-04-17 19:12:11 +02:00
|
|
|
CPUFREQ_POLICY_NOTIFIER);
|
2014-11-07 14:42:29 +01:00
|
|
|
list_add(&cpufreq_dev->node, &cpufreq_dev_list);
|
2012-08-16 13:41:40 +02:00
|
|
|
|
|
|
|
mutex_unlock(&cooling_cpufreq_lock);
|
2013-04-17 19:11:59 +02:00
|
|
|
|
2014-12-04 05:11:58 +01:00
|
|
|
return cool_dev;
|
|
|
|
|
|
|
|
remove_idr:
|
|
|
|
release_idr(&cpufreq_idr, cpufreq_dev->id);
|
2014-12-04 05:12:06 +01:00
|
|
|
free_table:
|
|
|
|
kfree(cpufreq_dev->freq_table);
|
2014-12-04 05:11:58 +01:00
|
|
|
free_cdev:
|
|
|
|
kfree(cpufreq_dev);
|
|
|
|
|
2012-08-16 13:41:40 +02:00
|
|
|
return cool_dev;
|
|
|
|
}
|
2013-09-13 01:26:45 +02:00
|
|
|
|
|
|
|
/**
|
|
|
|
* cpufreq_cooling_register - function to create cpufreq cooling device.
|
|
|
|
* @clip_cpus: cpumask of cpus where the frequency constraints will happen.
|
|
|
|
*
|
|
|
|
* This interface function registers the cpufreq cooling device with the name
|
|
|
|
* "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
|
|
|
|
* cooling devices.
|
|
|
|
*
|
|
|
|
* Return: a valid struct thermal_cooling_device pointer on success,
|
|
|
|
* on failure, it returns a corresponding ERR_PTR().
|
|
|
|
*/
|
|
|
|
struct thermal_cooling_device *
|
|
|
|
cpufreq_cooling_register(const struct cpumask *clip_cpus)
|
|
|
|
{
|
|
|
|
return __cpufreq_cooling_register(NULL, clip_cpus);
|
|
|
|
}
|
2013-04-17 19:11:57 +02:00
|
|
|
EXPORT_SYMBOL_GPL(cpufreq_cooling_register);
|
2012-08-16 13:41:40 +02:00
|
|
|
|
2013-09-13 01:26:45 +02:00
|
|
|
/**
|
|
|
|
* of_cpufreq_cooling_register - function to create cpufreq cooling device.
|
|
|
|
* @np: a valid struct device_node to the cooling device device tree node
|
|
|
|
* @clip_cpus: cpumask of cpus where the frequency constraints will happen.
|
|
|
|
*
|
|
|
|
* This interface function registers the cpufreq cooling device with the name
|
|
|
|
* "thermal-cpufreq-%x". This api can support multiple instances of cpufreq
|
|
|
|
* cooling devices. Using this API, the cpufreq cooling device will be
|
|
|
|
* linked to the device tree node provided.
|
|
|
|
*
|
|
|
|
* Return: a valid struct thermal_cooling_device pointer on success,
|
|
|
|
* on failure, it returns a corresponding ERR_PTR().
|
|
|
|
*/
|
|
|
|
struct thermal_cooling_device *
|
|
|
|
of_cpufreq_cooling_register(struct device_node *np,
|
|
|
|
const struct cpumask *clip_cpus)
|
|
|
|
{
|
|
|
|
if (!np)
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
|
|
|
|
return __cpufreq_cooling_register(np, clip_cpus);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register);
|
|
|
|
|
2012-08-16 13:41:40 +02:00
|
|
|
/**
|
|
|
|
* cpufreq_cooling_unregister - function to remove cpufreq cooling device.
|
|
|
|
* @cdev: thermal cooling device pointer.
|
2013-04-17 19:12:16 +02:00
|
|
|
*
|
|
|
|
* This interface function unregisters the "thermal-cpufreq-%x" cooling device.
|
2012-08-16 13:41:40 +02:00
|
|
|
*/
|
|
|
|
void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
|
|
|
|
{
|
2013-08-15 16:54:46 +02:00
|
|
|
struct cpufreq_cooling_device *cpufreq_dev;
|
2012-08-16 13:41:40 +02:00
|
|
|
|
2013-08-15 16:54:46 +02:00
|
|
|
if (!cdev)
|
|
|
|
return;
|
|
|
|
|
|
|
|
cpufreq_dev = cdev->devdata;
|
2012-08-16 13:41:40 +02:00
|
|
|
mutex_lock(&cooling_cpufreq_lock);
|
2014-11-07 14:42:29 +01:00
|
|
|
list_del(&cpufreq_dev->node);
|
2012-08-16 13:41:40 +02:00
|
|
|
|
|
|
|
/* Unregister the notifier for the last cpufreq cooling device */
|
2014-12-04 05:12:04 +01:00
|
|
|
if (list_empty(&cpufreq_dev_list))
|
2012-08-16 13:41:40 +02:00
|
|
|
cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block,
|
2013-04-17 19:12:11 +02:00
|
|
|
CPUFREQ_POLICY_NOTIFIER);
|
2012-08-16 13:41:40 +02:00
|
|
|
mutex_unlock(&cooling_cpufreq_lock);
|
2012-10-30 17:48:59 +01:00
|
|
|
|
2012-08-16 13:41:40 +02:00
|
|
|
thermal_cooling_device_unregister(cpufreq_dev->cool_dev);
|
|
|
|
release_idr(&cpufreq_idr, cpufreq_dev->id);
|
2014-12-04 05:12:06 +01:00
|
|
|
kfree(cpufreq_dev->freq_table);
|
2012-08-16 13:41:40 +02:00
|
|
|
kfree(cpufreq_dev);
|
|
|
|
}
|
2013-04-17 19:11:57 +02:00
|
|
|
EXPORT_SYMBOL_GPL(cpufreq_cooling_unregister);
|