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/platform_device.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 platform_device *pdev)
41{
42	struct regulator_config config = { };
43	int ret;
44
45	config.dev = &pdev->dev;
46	config.init_data = &dummy_initdata;
47
48	dummy_regulator_rdev = devm_regulator_register(&pdev->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
59static struct platform_driver dummy_regulator_driver = {
60	.probe		= dummy_regulator_probe,
61	.driver		= {
62		.name		= "reg-dummy",
63	},
64};
65
66static struct platform_device *dummy_pdev;
67
68void __init regulator_dummy_init(void)
69{
70	int ret;
71
72	dummy_pdev = platform_device_alloc("reg-dummy", -1);
73	if (!dummy_pdev) {
74		pr_err("Failed to allocate dummy regulator device\n");
75		return;
76	}
77
78	ret = platform_device_add(dummy_pdev);
79	if (ret != 0) {
80		pr_err("Failed to register dummy regulator device: %d\n", ret);
81		platform_device_put(dummy_pdev);
82		return;
83	}
84
85	ret = platform_driver_register(&dummy_regulator_driver);
86	if (ret != 0) {
87		pr_err("Failed to register dummy regulator driver: %d\n", ret);
88		platform_device_unregister(dummy_pdev);
89	}
90}

 
 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}