Merge tag 'pidfd-updates-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/braun...
[linux-2.6-block.git] / drivers / regulator / 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/platform_device.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 struct regulator_init_data dummy_initdata = {
25         .constraints = {
26                 .always_on = 1,
27         },
28 };
29
30 static 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
40 static 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 = regulator_register(&dummy_desc, &config);
49         if (IS_ERR(dummy_regulator_rdev)) {
50                 ret = PTR_ERR(dummy_regulator_rdev);
51                 pr_err("Failed to register regulator: %d\n", ret);
52                 return ret;
53         }
54
55         return 0;
56 }
57
58 static struct platform_driver dummy_regulator_driver = {
59         .probe          = dummy_regulator_probe,
60         .driver         = {
61                 .name           = "reg-dummy",
62         },
63 };
64
65 static struct platform_device *dummy_pdev;
66
67 void __init regulator_dummy_init(void)
68 {
69         int ret;
70
71         dummy_pdev = platform_device_alloc("reg-dummy", -1);
72         if (!dummy_pdev) {
73                 pr_err("Failed to allocate dummy regulator device\n");
74                 return;
75         }
76
77         ret = platform_device_add(dummy_pdev);
78         if (ret != 0) {
79                 pr_err("Failed to register dummy regulator device: %d\n", ret);
80                 platform_device_put(dummy_pdev);
81                 return;
82         }
83
84         ret = platform_driver_register(&dummy_regulator_driver);
85         if (ret != 0) {
86                 pr_err("Failed to register dummy regulator driver: %d\n", ret);
87                 platform_device_unregister(dummy_pdev);
88         }
89 }