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 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 | |
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 = devm_regulator_register(dev: &pdev->dev, regulator_desc: &dummy_desc, |
49 | config: &config); |
50 | if (IS_ERR(ptr: dummy_regulator_rdev)) { |
51 | ret = PTR_ERR(ptr: dummy_regulator_rdev); |
52 | pr_err("Failed to register regulator: %d\n" , ret); |
53 | return ret; |
54 | } |
55 | |
56 | return 0; |
57 | } |
58 | |
59 | static struct platform_driver dummy_regulator_driver = { |
60 | .probe = dummy_regulator_probe, |
61 | .driver = { |
62 | .name = "reg-dummy" , |
63 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
64 | }, |
65 | }; |
66 | |
67 | static struct platform_device *dummy_pdev; |
68 | |
69 | void __init regulator_dummy_init(void) |
70 | { |
71 | int ret; |
72 | |
73 | dummy_pdev = platform_device_alloc(name: "reg-dummy" , id: -1); |
74 | if (!dummy_pdev) { |
75 | pr_err("Failed to allocate dummy regulator device\n" ); |
76 | return; |
77 | } |
78 | |
79 | ret = platform_device_add(pdev: dummy_pdev); |
80 | if (ret != 0) { |
81 | pr_err("Failed to register dummy regulator device: %d\n" , ret); |
82 | platform_device_put(pdev: dummy_pdev); |
83 | return; |
84 | } |
85 | |
86 | ret = platform_driver_register(&dummy_regulator_driver); |
87 | if (ret != 0) { |
88 | pr_err("Failed to register dummy regulator driver: %d\n" , ret); |
89 | platform_device_unregister(dummy_pdev); |
90 | } |
91 | } |
92 | |