linux/drivers/thermal/db8500_cpufreq_cooling.c
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   1/*
   2 * db8500_cpufreq_cooling.c - DB8500 cpufreq works as cooling device.
   3 *
   4 * Copyright (C) 2012 ST-Ericsson
   5 * Copyright (C) 2012 Linaro Ltd.
   6 *
   7 * Author: Hongbo Zhang <hongbo.zhang@linaro.com>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License as published by
  11 * the Free Software Foundation; either version 2 of the License, or
  12 * (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 */
  19
  20#include <linux/cpu_cooling.h>
  21#include <linux/cpufreq.h>
  22#include <linux/err.h>
  23#include <linux/module.h>
  24#include <linux/platform_device.h>
  25#include <linux/slab.h>
  26
  27static int db8500_cpufreq_cooling_probe(struct platform_device *pdev)
  28{
  29        struct thermal_cooling_device *cdev;
  30        struct cpumask mask_val;
  31
  32        /* make sure cpufreq driver has been initialized */
  33        if (!cpufreq_frequency_get_table(0))
  34                return -EPROBE_DEFER;
  35
  36        cpumask_set_cpu(0, &mask_val);
  37        cdev = cpufreq_cooling_register(&mask_val);
  38
  39        if (IS_ERR_OR_NULL(cdev)) {
  40                dev_err(&pdev->dev, "Failed to register cooling device\n");
  41                return PTR_ERR(cdev);
  42        }
  43
  44        platform_set_drvdata(pdev, cdev);
  45
  46        dev_info(&pdev->dev, "Cooling device registered: %s\n", cdev->type);
  47
  48        return 0;
  49}
  50
  51static int db8500_cpufreq_cooling_remove(struct platform_device *pdev)
  52{
  53        struct thermal_cooling_device *cdev = platform_get_drvdata(pdev);
  54
  55        cpufreq_cooling_unregister(cdev);
  56
  57        return 0;
  58}
  59
  60static int db8500_cpufreq_cooling_suspend(struct platform_device *pdev,
  61                pm_message_t state)
  62{
  63        return -ENOSYS;
  64}
  65
  66static int db8500_cpufreq_cooling_resume(struct platform_device *pdev)
  67{
  68        return -ENOSYS;
  69}
  70
  71#ifdef CONFIG_OF
  72static const struct of_device_id db8500_cpufreq_cooling_match[] = {
  73        { .compatible = "stericsson,db8500-cpufreq-cooling" },
  74        {},
  75};
  76#else
  77#define db8500_cpufreq_cooling_match NULL
  78#endif
  79
  80static struct platform_driver db8500_cpufreq_cooling_driver = {
  81        .driver = {
  82                .owner = THIS_MODULE,
  83                .name = "db8500-cpufreq-cooling",
  84                .of_match_table = db8500_cpufreq_cooling_match,
  85        },
  86        .probe = db8500_cpufreq_cooling_probe,
  87        .suspend = db8500_cpufreq_cooling_suspend,
  88        .resume = db8500_cpufreq_cooling_resume,
  89        .remove = db8500_cpufreq_cooling_remove,
  90};
  91
  92static int __init db8500_cpufreq_cooling_init(void)
  93{
  94        return platform_driver_register(&db8500_cpufreq_cooling_driver);
  95}
  96
  97static void __exit db8500_cpufreq_cooling_exit(void)
  98{
  99        platform_driver_unregister(&db8500_cpufreq_cooling_driver);
 100}
 101
 102/* Should be later than db8500_cpufreq_register */
 103late_initcall(db8500_cpufreq_cooling_init);
 104module_exit(db8500_cpufreq_cooling_exit);
 105
 106MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
 107MODULE_DESCRIPTION("DB8500 cpufreq cooling driver");
 108MODULE_LICENSE("GPL");
 109
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