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
27static 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
50static 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
59static int db8500_cpufreq_cooling_suspend(struct platform_device *pdev,
60		pm_message_t state)
61{
62	return -ENOSYS;
63}
64
65static int db8500_cpufreq_cooling_resume(struct platform_device *pdev)
66{
67	return -ENOSYS;
68}
69
70#ifdef CONFIG_OF
71static const struct of_device_id db8500_cpufreq_cooling_match[] = {
72	{ .compatible = "stericsson,db8500-cpufreq-cooling" },
73	{},
74};
75#endif
76
77static 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
88static int __init db8500_cpufreq_cooling_init(void)
89{
90	return platform_driver_register(&db8500_cpufreq_cooling_driver);
91}
92
93static 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 */
99late_initcall(db8500_cpufreq_cooling_init);
100module_exit(db8500_cpufreq_cooling_exit);
101
102MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
103MODULE_DESCRIPTION("DB8500 cpufreq cooling driver");
104MODULE_LICENSE("GPL");
105