Merge tag 'topic/core-stuff-2014-12-19' of git://anongit.freedesktop.org/drm-intel...
[linux-2.6-microblaze.git] / drivers / regulator / dummy.c
1 /*
2  * dummy.c
3  *
4  * Copyright 2010 Wolfson Microelectronics PLC.
5  *
6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of the
11  * License, or (at your option) any later version.
12  *
13  * This is useful for systems with mixed controllable and
14  * non-controllable regulators, as well as for allowing testing on
15  * systems with no controllable regulators.
16  */
17
18 #include <linux/err.h>
19 #include <linux/export.h>
20 #include <linux/platform_device.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/regulator/machine.h>
23
24 #include "dummy.h"
25
26 struct regulator_dev *dummy_regulator_rdev;
27
28 static struct regulator_init_data dummy_initdata = {
29         .constraints = {
30                 .always_on = 1,
31         },
32 };
33
34 static struct regulator_ops dummy_ops;
35
36 static const struct regulator_desc dummy_desc = {
37         .name = "regulator-dummy",
38         .id = -1,
39         .type = REGULATOR_VOLTAGE,
40         .owner = THIS_MODULE,
41         .ops = &dummy_ops,
42 };
43
44 static int dummy_regulator_probe(struct platform_device *pdev)
45 {
46         struct regulator_config config = { };
47         int ret;
48
49         config.dev = &pdev->dev;
50         config.init_data = &dummy_initdata;
51
52         dummy_regulator_rdev = regulator_register(&dummy_desc, &config);
53         if (IS_ERR(dummy_regulator_rdev)) {
54                 ret = PTR_ERR(dummy_regulator_rdev);
55                 pr_err("Failed to register regulator: %d\n", ret);
56                 return ret;
57         }
58
59         return 0;
60 }
61
62 static struct platform_driver dummy_regulator_driver = {
63         .probe          = dummy_regulator_probe,
64         .driver         = {
65                 .name           = "reg-dummy",
66         },
67 };
68
69 static struct platform_device *dummy_pdev;
70
71 void __init regulator_dummy_init(void)
72 {
73         int ret;
74
75         dummy_pdev = platform_device_alloc("reg-dummy", -1);
76         if (!dummy_pdev) {
77                 pr_err("Failed to allocate dummy regulator device\n");
78                 return;
79         }
80
81         ret = platform_device_add(dummy_pdev);
82         if (ret != 0) {
83                 pr_err("Failed to register dummy regulator device: %d\n", ret);
84                 platform_device_put(dummy_pdev);
85                 return;
86         }
87
88         ret = platform_driver_register(&dummy_regulator_driver);
89         if (ret != 0) {
90                 pr_err("Failed to register dummy regulator driver: %d\n", ret);
91                 platform_device_unregister(dummy_pdev);
92         }
93 }