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1 | /* linux/arch/arm/plat-samsung/pd.c |
2 | * | |
3 | * Copyright (c) 2010 Samsung Electronics Co., Ltd. | |
4 | * http://www.samsung.com | |
5 | * | |
6 | * Samsung Power domain support | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/init.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/pm_runtime.h> | |
18 | ||
19 | #include <plat/pd.h> | |
20 | ||
21 | static int samsung_pd_probe(struct platform_device *pdev) | |
22 | { | |
23 | struct samsung_pd_info *pdata = pdev->dev.platform_data; | |
24 | struct device *dev = &pdev->dev; | |
25 | ||
26 | if (!pdata) { | |
27 | dev_err(dev, "no device data specified\n"); | |
28 | return -ENOENT; | |
29 | } | |
30 | ||
31 | pm_runtime_set_active(dev); | |
32 | pm_runtime_enable(dev); | |
33 | ||
34 | dev_info(dev, "power domain registered\n"); | |
35 | return 0; | |
36 | } | |
37 | ||
38 | static int __devexit samsung_pd_remove(struct platform_device *pdev) | |
39 | { | |
40 | struct device *dev = &pdev->dev; | |
41 | ||
42 | pm_runtime_disable(dev); | |
43 | return 0; | |
44 | } | |
45 | ||
46 | static int samsung_pd_runtime_suspend(struct device *dev) | |
47 | { | |
48 | struct samsung_pd_info *pdata = dev->platform_data; | |
49 | int ret = 0; | |
50 | ||
51 | if (pdata->disable) | |
52 | ret = pdata->disable(dev); | |
53 | ||
54 | dev_dbg(dev, "suspended\n"); | |
55 | return ret; | |
56 | } | |
57 | ||
58 | static int samsung_pd_runtime_resume(struct device *dev) | |
59 | { | |
60 | struct samsung_pd_info *pdata = dev->platform_data; | |
61 | int ret = 0; | |
62 | ||
63 | if (pdata->enable) | |
64 | ret = pdata->enable(dev); | |
65 | ||
66 | dev_dbg(dev, "resumed\n"); | |
67 | return ret; | |
68 | } | |
69 | ||
70 | static const struct dev_pm_ops samsung_pd_pm_ops = { | |
71 | .runtime_suspend = samsung_pd_runtime_suspend, | |
72 | .runtime_resume = samsung_pd_runtime_resume, | |
73 | }; | |
74 | ||
75 | static struct platform_driver samsung_pd_driver = { | |
76 | .driver = { | |
77 | .name = "samsung-pd", | |
78 | .owner = THIS_MODULE, | |
79 | .pm = &samsung_pd_pm_ops, | |
80 | }, | |
81 | .probe = samsung_pd_probe, | |
82 | .remove = __devexit_p(samsung_pd_remove), | |
83 | }; | |
84 | ||
85 | static int __init samsung_pd_init(void) | |
86 | { | |
87 | int ret; | |
88 | ||
89 | ret = platform_driver_register(&samsung_pd_driver); | |
90 | if (ret) | |
91 | printk(KERN_ERR "%s: failed to add PD driver\n", __func__); | |
92 | ||
93 | return ret; | |
94 | } | |
95 | arch_initcall(samsung_pd_init); |