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
 28static 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
 52static 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
 61static int db8500_cpufreq_cooling_suspend(struct platform_device *pdev,
 62		pm_message_t state)
 63{
 64	return -ENOSYS;
 65}
 66
 67static int db8500_cpufreq_cooling_resume(struct platform_device *pdev)
 68{
 69	return -ENOSYS;
 70}
 71
 72#ifdef CONFIG_OF
 73static const struct of_device_id db8500_cpufreq_cooling_match[] = {
 74	{ .compatible = "stericsson,db8500-cpufreq-cooling" },
 75	{},
 76};
 77#endif
 78
 79static 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
 91static int __init db8500_cpufreq_cooling_init(void)
 92{
 93	return platform_driver_register(&db8500_cpufreq_cooling_driver);
 94}
 95
 96static 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 */
102late_initcall(db8500_cpufreq_cooling_init);
103module_exit(db8500_cpufreq_cooling_exit);
104
105MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
106MODULE_DESCRIPTION("DB8500 cpufreq cooling driver");
107MODULE_LICENSE("GPL");