dummy.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * dummy.c
 4 *
 5 * Copyright 2010 Wolfson Microelectronics PLC.
 6 *
 7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 8 *
 9 * This is useful for systems with mixed controllable and
10 * non-controllable regulators, as well as for allowing testing on
11 * systems with no controllable regulators.
12 */
13
14#include <linux/err.h>
15#include <linux/export.h>
16#include <linux/device/faux.h>
17#include <linux/regulator/driver.h>
18#include <linux/regulator/machine.h>
19
20#include "dummy.h"
21
22struct regulator_dev *dummy_regulator_rdev;
23
24static const struct regulator_init_data dummy_initdata = {
25	.constraints = {
26		.always_on = 1,
27	},
28};
29
30static const struct regulator_ops dummy_ops;
31
32static const struct regulator_desc dummy_desc = {
33	.name = "regulator-dummy",
34	.id = -1,
35	.type = REGULATOR_VOLTAGE,
36	.owner = THIS_MODULE,
37	.ops = &dummy_ops,
38};
39
40static int dummy_regulator_probe(struct faux_device *fdev)
41{
42	struct regulator_config config = { };
43	int ret;
44
45	config.dev = &fdev->dev;
46	config.init_data = &dummy_initdata;
47
48	dummy_regulator_rdev = devm_regulator_register(&fdev->dev, &dummy_desc,
49						       &config);
50	if (IS_ERR(dummy_regulator_rdev)) {
51		ret = PTR_ERR(dummy_regulator_rdev);
52		pr_err("Failed to register regulator: %d\n", ret);
53		return ret;
54	}
55
56	return 0;
57}
58
59struct faux_device_ops dummy_regulator_driver = {
60	.probe = dummy_regulator_probe,
61};
62
63static struct faux_device *dummy_fdev;
64
65void __init regulator_dummy_init(void)
66{
67	dummy_fdev = faux_device_create("reg-dummy", NULL, &dummy_regulator_driver);
68	if (!dummy_fdev) {
69		pr_err("Failed to allocate dummy regulator device\n");
70		return;
71	}
72}