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