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 .constraints = {
30 .always_on = 1,
31 },
32};
33
34static struct regulator_ops dummy_ops;
35
36static 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
44static 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
62static struct platform_driver dummy_regulator_driver = {
63 .probe = dummy_regulator_probe,
64 .driver = {
65 .name = "reg-dummy",
66 },
67};
68
69static struct platform_device *dummy_pdev;
70
71void __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}
94