LXR linux/drivers/thermal/db8500_cpufreq

   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/err.h>
  22#include <linux/module.h>
  23#include <linux/of.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
  31        cdev = cpufreq_cooling_register(cpu_present_mask);
  32        if (IS_ERR(cdev)) {
  33                int ret = PTR_ERR(cdev);
  34
  35                if (ret != -EPROBE_DEFER)
  36                        dev_err(&pdev->dev,
  37                                "Failed to register cooling device %d\n",
  38                                ret);
  39                                
  40                return ret;
  41        }
  42
  43        platform_set_drvdata(pdev, cdev);
  44
  45        dev_info(&pdev->dev, "Cooling device registered: %s\n", cdev->type);
  46
  47        return 0;
  48}
  49
  50static int db8500_cpufreq_cooling_remove(struct platform_device *pdev)
  51{
  52        struct thermal_cooling_device *cdev = platform_get_drvdata(pdev);
  53
  54        cpufreq_cooling_unregister(cdev);
  55
  56        return 0;
  57}
  58
  59static int db8500_cpufreq_cooling_suspend(struct platform_device *pdev,
  60                pm_message_t state)
  61{
  62        return -ENOSYS;
  63}
  64
  65static int db8500_cpufreq_cooling_resume(struct platform_device *pdev)
  66{
  67        return -ENOSYS;
  68}
  69
  70#ifdef CONFIG_OF
  71static const struct of_device_id db8500_cpufreq_cooling_match[] = {
  72        { .compatible = "stericsson,db8500-cpufreq-cooling" },
  73        {},
  74};
  75MODULE_DEVICE_TABLE(of, db8500_cpufreq_cooling_match);
  76#endif
  77
  78static struct platform_driver db8500_cpufreq_cooling_driver = {
  79        .driver = {
  80                .name = "db8500-cpufreq-cooling",
  81                .of_match_table = of_match_ptr(db8500_cpufreq_cooling_match),
  82        },
  83        .probe = db8500_cpufreq_cooling_probe,
  84        .suspend = db8500_cpufreq_cooling_suspend,
  85        .resume = db8500_cpufreq_cooling_resume,
  86        .remove = db8500_cpufreq_cooling_remove,
  87};
  88
  89static int __init db8500_cpufreq_cooling_init(void)
  90{
  91        return platform_driver_register(&db8500_cpufreq_cooling_driver);
  92}
  93
  94static void __exit db8500_cpufreq_cooling_exit(void)
  95{
  96        platform_driver_unregister(&db8500_cpufreq_cooling_driver);
  97}
  98
  99/* Should be later than db8500_cpufreq_register */
 100late_initcall(db8500_cpufreq_cooling_init);
 101module_exit(db8500_cpufreq_cooling_exit);
 102
 103MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
 104MODULE_DESCRIPTION("DB8500 cpufreq cooling driver");
 105MODULE_LICENSE("GPL");
 106