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