aa1acb04 |
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 | |
27 | static 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 | |
51 | static 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 | |
60 | static int db8500_cpufreq_cooling_suspend(struct platform_device *pdev, |
61 | pm_message_t state) |
62 | { |
63 | return -ENOSYS; |
64 | } |
65 | |
66 | static int db8500_cpufreq_cooling_resume(struct platform_device *pdev) |
67 | { |
68 | return -ENOSYS; |
69 | } |
70 | |
71 | #ifdef CONFIG_OF |
72 | static 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 | |
80 | static 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 | |
92 | static int __init db8500_cpufreq_cooling_init(void) |
93 | { |
94 | return platform_driver_register(&db8500_cpufreq_cooling_driver); |
95 | } |
96 | |
97 | static 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 */ |
103 | late_initcall(db8500_cpufreq_cooling_init); |
104 | module_exit(db8500_cpufreq_cooling_exit); |
105 | |
106 | MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>"); |
107 | MODULE_DESCRIPTION("DB8500 cpufreq cooling driver"); |
108 | MODULE_LICENSE("GPL"); |