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
30 static struct regulator_ops dummy_ops;
31
32 static struct regulator_desc dummy_desc = {
33 .name = "dummy",
34 .id = -1,
35 .type = REGULATOR_VOLTAGE,
36 .owner = THIS_MODULE,
37 .ops = &dummy_ops,
38 };
39
dummy_regulator_probe(struct platform_device * pdev)40 static int __devinit dummy_regulator_probe(struct platform_device *pdev)
41 {
42 int ret;
43
44 dummy_regulator_rdev = regulator_register(&dummy_desc, NULL,
45 &dummy_initdata, NULL, NULL);
46 if (IS_ERR(dummy_regulator_rdev)) {
47 ret = PTR_ERR(dummy_regulator_rdev);
48 pr_err("Failed to register regulator: %d\n", ret);
49 return ret;
50 }
51
52 return 0;
53 }
54
55 static struct platform_driver dummy_regulator_driver = {
56 .probe = dummy_regulator_probe,
57 .driver = {
58 .name = "reg-dummy",
59 .owner = THIS_MODULE,
60 },
61 };
62
63 static struct platform_device *dummy_pdev;
64
regulator_dummy_init(void)65 void __init regulator_dummy_init(void)
66 {
67 int ret;
68
69 dummy_pdev = platform_device_alloc("reg-dummy", -1);
70 if (!dummy_pdev) {
71 pr_err("Failed to allocate dummy regulator device\n");
72 return;
73 }
74
75 ret = platform_device_add(dummy_pdev);
76 if (ret != 0) {
77 pr_err("Failed to register dummy regulator device: %d\n", ret);
78 platform_device_put(dummy_pdev);
79 return;
80 }
81
82 ret = platform_driver_register(&dummy_regulator_driver);
83 if (ret != 0) {
84 pr_err("Failed to register dummy regulator driver: %d\n", ret);
85 platform_device_unregister(dummy_pdev);
86 }
87 }
88