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/of.h>
25 #include <linux/platform_device.h>
26 #include <linux/slab.h>
27
db8500_cpufreq_cooling_probe(struct platform_device * pdev)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
40 if (IS_ERR(cdev)) {
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
db8500_cpufreq_cooling_remove(struct platform_device * pdev)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
db8500_cpufreq_cooling_suspend(struct platform_device * pdev,pm_message_t state)61 static int db8500_cpufreq_cooling_suspend(struct platform_device *pdev,
62 pm_message_t state)
63 {
64 return -ENOSYS;
65 }
66
db8500_cpufreq_cooling_resume(struct platform_device * pdev)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 };
77 #endif
78
79 static struct platform_driver db8500_cpufreq_cooling_driver = {
80 .driver = {
81 .owner = THIS_MODULE,
82 .name = "db8500-cpufreq-cooling",
83 .of_match_table = of_match_ptr(db8500_cpufreq_cooling_match),
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
db8500_cpufreq_cooling_init(void)91 static int __init db8500_cpufreq_cooling_init(void)
92 {
93 return platform_driver_register(&db8500_cpufreq_cooling_driver);
94 }
95
db8500_cpufreq_cooling_exit(void)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");
108