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
22 struct regulator_dev *dummy_regulator_rdev;
23
24 static const struct regulator_init_data dummy_initdata = {
25 .constraints = {
26 .always_on = 1,
27 },
28 };
29
30 static const struct regulator_ops dummy_ops;
31
32 static 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
dummy_regulator_probe(struct faux_device * fdev)40 static 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
59 struct faux_device_ops dummy_regulator_driver = {
60 .probe = dummy_regulator_probe,
61 };
62
63 static struct faux_device *dummy_fdev;
64
regulator_dummy_init(void)65 void __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 }
73