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Linux/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                 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 
 50 static 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 
 59 static int db8500_cpufreq_cooling_suspend(struct platform_device *pdev,
 60                 pm_message_t state)
 61 {
 62         return -ENOSYS;
 63 }
 64 
 65 static int db8500_cpufreq_cooling_resume(struct platform_device *pdev)
 66 {
 67         return -ENOSYS;
 68 }
 69 
 70 #ifdef CONFIG_OF
 71 static const struct of_device_id db8500_cpufreq_cooling_match[] = {
 72         { .compatible = "stericsson,db8500-cpufreq-cooling" },
 73         {},
 74 };
 75 #endif
 76 
 77 static struct platform_driver db8500_cpufreq_cooling_driver = {
 78         .driver = {
 79                 .name = "db8500-cpufreq-cooling",
 80                 .of_match_table = of_match_ptr(db8500_cpufreq_cooling_match),
 81         },
 82         .probe = db8500_cpufreq_cooling_probe,
 83         .suspend = db8500_cpufreq_cooling_suspend,
 84         .resume = db8500_cpufreq_cooling_resume,
 85         .remove = db8500_cpufreq_cooling_remove,
 86 };
 87 
 88 static int __init db8500_cpufreq_cooling_init(void)
 89 {
 90         return platform_driver_register(&db8500_cpufreq_cooling_driver);
 91 }
 92 
 93 static void __exit db8500_cpufreq_cooling_exit(void)
 94 {
 95         platform_driver_unregister(&db8500_cpufreq_cooling_driver);
 96 }
 97 
 98 /* Should be later than db8500_cpufreq_register */
 99 late_initcall(db8500_cpufreq_cooling_init);
100 module_exit(db8500_cpufreq_cooling_exit);
101 
102 MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
103 MODULE_DESCRIPTION("DB8500 cpufreq cooling driver");
104 MODULE_LICENSE("GPL");
105 

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