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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"); |