1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * dummy.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright 2010 Wolfson Microelectronics PLC.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * This is useful for systems with mixed controllable and
10*4882a593Smuzhiyun * non-controllable regulators, as well as for allowing testing on
11*4882a593Smuzhiyun * systems with no controllable regulators.
12*4882a593Smuzhiyun */
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include <linux/err.h>
15*4882a593Smuzhiyun #include <linux/export.h>
16*4882a593Smuzhiyun #include <linux/platform_device.h>
17*4882a593Smuzhiyun #include <linux/regulator/driver.h>
18*4882a593Smuzhiyun #include <linux/regulator/machine.h>
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun #include "dummy.h"
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun struct regulator_dev *dummy_regulator_rdev;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun static const struct regulator_init_data dummy_initdata = {
25*4882a593Smuzhiyun .constraints = {
26*4882a593Smuzhiyun .always_on = 1,
27*4882a593Smuzhiyun },
28*4882a593Smuzhiyun };
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun static const struct regulator_ops dummy_ops;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun static const struct regulator_desc dummy_desc = {
33*4882a593Smuzhiyun .name = "regulator-dummy",
34*4882a593Smuzhiyun .id = -1,
35*4882a593Smuzhiyun .type = REGULATOR_VOLTAGE,
36*4882a593Smuzhiyun .owner = THIS_MODULE,
37*4882a593Smuzhiyun .ops = &dummy_ops,
38*4882a593Smuzhiyun };
39*4882a593Smuzhiyun
dummy_regulator_probe(struct platform_device * pdev)40*4882a593Smuzhiyun static int dummy_regulator_probe(struct platform_device *pdev)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun struct regulator_config config = { };
43*4882a593Smuzhiyun int ret;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun config.dev = &pdev->dev;
46*4882a593Smuzhiyun config.init_data = &dummy_initdata;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun dummy_regulator_rdev = regulator_register(&dummy_desc, &config);
49*4882a593Smuzhiyun if (IS_ERR(dummy_regulator_rdev)) {
50*4882a593Smuzhiyun ret = PTR_ERR(dummy_regulator_rdev);
51*4882a593Smuzhiyun pr_err("Failed to register regulator: %d\n", ret);
52*4882a593Smuzhiyun return ret;
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun return 0;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun static struct platform_driver dummy_regulator_driver = {
59*4882a593Smuzhiyun .probe = dummy_regulator_probe,
60*4882a593Smuzhiyun .driver = {
61*4882a593Smuzhiyun .name = "reg-dummy",
62*4882a593Smuzhiyun },
63*4882a593Smuzhiyun };
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun static struct platform_device *dummy_pdev;
66*4882a593Smuzhiyun
regulator_dummy_init(void)67*4882a593Smuzhiyun void __init regulator_dummy_init(void)
68*4882a593Smuzhiyun {
69*4882a593Smuzhiyun int ret;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun dummy_pdev = platform_device_alloc("reg-dummy", -1);
72*4882a593Smuzhiyun if (!dummy_pdev) {
73*4882a593Smuzhiyun pr_err("Failed to allocate dummy regulator device\n");
74*4882a593Smuzhiyun return;
75*4882a593Smuzhiyun }
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun ret = platform_device_add(dummy_pdev);
78*4882a593Smuzhiyun if (ret != 0) {
79*4882a593Smuzhiyun pr_err("Failed to register dummy regulator device: %d\n", ret);
80*4882a593Smuzhiyun platform_device_put(dummy_pdev);
81*4882a593Smuzhiyun return;
82*4882a593Smuzhiyun }
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun ret = platform_driver_register(&dummy_regulator_driver);
85*4882a593Smuzhiyun if (ret != 0) {
86*4882a593Smuzhiyun pr_err("Failed to register dummy regulator driver: %d\n", ret);
87*4882a593Smuzhiyun platform_device_unregister(dummy_pdev);
88*4882a593Smuzhiyun }
89*4882a593Smuzhiyun }
90