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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> | |
c076fc42 | 24 | #include <linux/of.h> |
aa1acb04 | 25 | #include <linux/platform_device.h> |
26 | #include <linux/slab.h> | |
27 | ||
28 | static 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 | ||
70d23b29 | 40 | if (IS_ERR(cdev)) { |
aa1acb04 | 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 | ||
52 | static 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 | ||
61 | static int db8500_cpufreq_cooling_suspend(struct platform_device *pdev, | |
62 | pm_message_t state) | |
63 | { | |
64 | return -ENOSYS; | |
65 | } | |
66 | ||
67 | static int db8500_cpufreq_cooling_resume(struct platform_device *pdev) | |
68 | { | |
69 | return -ENOSYS; | |
70 | } | |
71 | ||
72 | #ifdef CONFIG_OF | |
73 | static const struct of_device_id db8500_cpufreq_cooling_match[] = { | |
74 | { .compatible = "stericsson,db8500-cpufreq-cooling" }, | |
75 | {}, | |
76 | }; | |
aa1acb04 | 77 | #endif |
78 | ||
79 | static struct platform_driver db8500_cpufreq_cooling_driver = { | |
80 | .driver = { | |
81 | .owner = THIS_MODULE, | |
82 | .name = "db8500-cpufreq-cooling", | |
c076fc42 | 83 | .of_match_table = of_match_ptr(db8500_cpufreq_cooling_match), |
aa1acb04 | 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 | ||
91 | static int __init db8500_cpufreq_cooling_init(void) | |
92 | { | |
93 | return platform_driver_register(&db8500_cpufreq_cooling_driver); | |
94 | } | |
95 | ||
96 | static 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 */ | |
102 | late_initcall(db8500_cpufreq_cooling_init); | |
103 | module_exit(db8500_cpufreq_cooling_exit); | |
104 | ||
105 | MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>"); | |
106 | MODULE_DESCRIPTION("DB8500 cpufreq cooling driver"); | |
107 | MODULE_LICENSE("GPL"); |