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