regulator: Fix WM831x regulator ID lookups for multiple WM831xs
[linux-2.6.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/platform_device.h>
20 #include <linux/regulator/driver.h>
21 #include <linux/regulator/machine.h>
22
23 #include "dummy.h"
24
25 struct regulator_dev *dummy_regulator_rdev;
26
27 static struct regulator_init_data dummy_initdata;
28
29 static struct regulator_ops dummy_ops;
30
31 static struct regulator_desc dummy_desc = {
32         .name = "dummy",
33         .id = -1,
34         .type = REGULATOR_VOLTAGE,
35         .owner = THIS_MODULE,
36         .ops = &dummy_ops,
37 };
38
39 static int __devinit dummy_regulator_probe(struct platform_device *pdev)
40 {
41         int ret;
42
43         dummy_regulator_rdev = regulator_register(&dummy_desc, NULL,
44                                                   &dummy_initdata, NULL);
45         if (IS_ERR(dummy_regulator_rdev)) {
46                 ret = PTR_ERR(dummy_regulator_rdev);
47                 pr_err("Failed to register regulator: %d\n", ret);
48                 return ret;
49         }
50
51         return 0;
52 }
53
54 static struct platform_driver dummy_regulator_driver = {
55         .probe          = dummy_regulator_probe,
56         .driver         = {
57                 .name           = "reg-dummy",
58                 .owner          = THIS_MODULE,
59         },
60 };
61
62 static struct platform_device *dummy_pdev;
63
64 void __init regulator_dummy_init(void)
65 {
66         int ret;
67
68         dummy_pdev = platform_device_alloc("reg-dummy", -1);
69         if (!dummy_pdev) {
70                 pr_err("Failed to allocate dummy regulator device\n");
71                 return;
72         }
73
74         ret = platform_device_add(dummy_pdev);
75         if (ret != 0) {
76                 pr_err("Failed to register dummy regulator device: %d\n", ret);
77                 platform_device_put(dummy_pdev);
78                 return;
79         }
80
81         ret = platform_driver_register(&dummy_regulator_driver);
82         if (ret != 0) {
83                 pr_err("Failed to register dummy regulator driver: %d\n", ret);
84                 platform_device_unregister(dummy_pdev);
85         }
86 }