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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/cpufreq.h>
 22 #include <linux/err.h>
 23 #include <linux/module.h>
 24 #include <linux/of.h>
 25 #include <linux/platform_device.h>
 26 #include <linux/slab.h>
 27 
 28 static int db8500_cpufreq_cooling_probe(struct platform_device *pdev)
 29 {
 30         struct thermal_cooling_device *cdev;
 31         struct cpumask mask_val;
 32 
 33         /* make sure cpufreq driver has been initialized */
 34         if (!cpufreq_frequency_get_table(0))
 35                 return -EPROBE_DEFER;
 36 
 37         cpumask_set_cpu(0, &mask_val);
 38         cdev = cpufreq_cooling_register(&mask_val);
 39 
 40         if (IS_ERR(cdev)) {
 41                 dev_err(&pdev->dev, "Failed to register cooling device\n");
 42                 return PTR_ERR(cdev);
 43         }
 44 
 45         platform_set_drvdata(pdev, cdev);
 46 
 47         dev_info(&pdev->dev, "Cooling device registered: %s\n", cdev->type);
 48 
 49         return 0;
 50 }
 51 
 52 static int db8500_cpufreq_cooling_remove(struct platform_device *pdev)
 53 {
 54         struct thermal_cooling_device *cdev = platform_get_drvdata(pdev);
 55 
 56         cpufreq_cooling_unregister(cdev);
 57 
 58         return 0;
 59 }
 60 
 61 static int db8500_cpufreq_cooling_suspend(struct platform_device *pdev,
 62                 pm_message_t state)
 63 {
 64         return -ENOSYS;
 65 }
 66 
 67 static int db8500_cpufreq_cooling_resume(struct platform_device *pdev)
 68 {
 69         return -ENOSYS;
 70 }
 71 
 72 #ifdef CONFIG_OF
 73 static const struct of_device_id db8500_cpufreq_cooling_match[] = {
 74         { .compatible = "stericsson,db8500-cpufreq-cooling" },
 75         {},
 76 };
 77 #endif
 78 
 79 static struct platform_driver db8500_cpufreq_cooling_driver = {
 80         .driver = {
 81                 .owner = THIS_MODULE,
 82                 .name = "db8500-cpufreq-cooling",
 83                 .of_match_table = of_match_ptr(db8500_cpufreq_cooling_match),
 84         },
 85         .probe = db8500_cpufreq_cooling_probe,
 86         .suspend = db8500_cpufreq_cooling_suspend,
 87         .resume = db8500_cpufreq_cooling_resume,
 88         .remove = db8500_cpufreq_cooling_remove,
 89 };
 90 
 91 static int __init db8500_cpufreq_cooling_init(void)
 92 {
 93         return platform_driver_register(&db8500_cpufreq_cooling_driver);
 94 }
 95 
 96 static void __exit db8500_cpufreq_cooling_exit(void)
 97 {
 98         platform_driver_unregister(&db8500_cpufreq_cooling_driver);
 99 }
100 
101 /* Should be later than db8500_cpufreq_register */
102 late_initcall(db8500_cpufreq_cooling_init);
103 module_exit(db8500_cpufreq_cooling_exit);
104 
105 MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
106 MODULE_DESCRIPTION("DB8500 cpufreq cooling driver");
107 MODULE_LICENSE("GPL");
108 

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