/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
25struct regulator_dev *dummy_regulator_rdev;
26
27static struct regulator_init_data dummy_initdata;
28
29static struct regulator_ops dummy_ops;
30
31static 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
39static struct platform_device *dummy_pdev;
40
41void __init regulator_dummy_init(void)
42{
43	int ret;
44
45	dummy_pdev = platform_device_alloc("reg-dummy", -1);
46	if (!dummy_pdev) {
47		pr_err("Failed to allocate dummy regulator device\n");
48		return;
49	}
50
51	ret = platform_device_add(dummy_pdev);
52	if (ret != 0) {
53		pr_err("Failed to register dummy regulator device: %d\n", ret);
54		platform_device_put(dummy_pdev);
55		return;
56	}
57
58	dummy_regulator_rdev = regulator_register(&dummy_desc, NULL,
59						  &dummy_initdata, NULL);
60	if (IS_ERR(dummy_regulator_rdev)) {
61		ret = PTR_ERR(dummy_regulator_rdev);
62		pr_err("Failed to register regulator: %d\n", ret);
63		platform_device_unregister(dummy_pdev);
64		return;
65	}
66}