dummy.c revision 0f82b6cf76516063fe26dac15e93544387c681eb 
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
26struct regulator_dev *dummy_regulator_rdev;
27
28static struct regulator_init_data dummy_initdata;
29
30static struct regulator_ops dummy_ops;
31
32static 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
40static int __devinit dummy_regulator_probe(struct platform_device *pdev)
41{
42	struct regulator_config config = { };
43	int ret;
44
45	config.dev = &pdev->dev;
46	config.init_data = &dummy_initdata;
47
48	dummy_regulator_rdev = regulator_register(&dummy_desc, &config);
49	if (IS_ERR(dummy_regulator_rdev)) {
50		ret = PTR_ERR(dummy_regulator_rdev);
51		pr_err("Failed to register regulator: %d\n", ret);
52		return ret;
53	}
54
55	return 0;
56}
57
58static struct platform_driver dummy_regulator_driver = {
59	.probe		= dummy_regulator_probe,
60	.driver		= {
61		.name		= "reg-dummy",
62		.owner		= THIS_MODULE,
63	},
64};
65
66static struct platform_device *dummy_pdev;
67
68void __init regulator_dummy_init(void)
69{
70	int ret;
71
72	dummy_pdev = platform_device_alloc("reg-dummy", -1);
73	if (!dummy_pdev) {
74		pr_err("Failed to allocate dummy regulator device\n");
75		return;
76	}
77
78	ret = platform_device_add(dummy_pdev);
79	if (ret != 0) {
80		pr_err("Failed to register dummy regulator device: %d\n", ret);
81		platform_device_put(dummy_pdev);
82		return;
83	}
84
85	ret = platform_driver_register(&dummy_regulator_driver);
86	if (ret != 0) {
87		pr_err("Failed to register dummy regulator driver: %d\n", ret);
88		platform_device_unregister(dummy_pdev);
89	}
90}
91