drivers/thermal/db8500_cpufreq_cooling.c

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