12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
234abbd68SMark Brown /*
334abbd68SMark Brown * dummy.c
434abbd68SMark Brown *
534abbd68SMark Brown * Copyright 2010 Wolfson Microelectronics PLC.
634abbd68SMark Brown *
734abbd68SMark Brown * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
834abbd68SMark Brown *
934abbd68SMark Brown * This is useful for systems with mixed controllable and
1034abbd68SMark Brown * non-controllable regulators, as well as for allowing testing on
1134abbd68SMark Brown * systems with no controllable regulators.
1234abbd68SMark Brown */
1334abbd68SMark Brown
1434abbd68SMark Brown #include <linux/err.h>
1522be053fSPaul Gortmaker #include <linux/export.h>
1634abbd68SMark Brown #include <linux/platform_device.h>
1734abbd68SMark Brown #include <linux/regulator/driver.h>
1834abbd68SMark Brown #include <linux/regulator/machine.h>
1934abbd68SMark Brown
2034abbd68SMark Brown #include "dummy.h"
2134abbd68SMark Brown
2234abbd68SMark Brown struct regulator_dev *dummy_regulator_rdev;
2334abbd68SMark Brown
24087c09c2SRikard Falkeborn static const struct regulator_init_data dummy_initdata = {
258669544aSMarkus Pargmann .constraints = {
268669544aSMarkus Pargmann .always_on = 1,
278669544aSMarkus Pargmann },
288669544aSMarkus Pargmann };
2934abbd68SMark Brown
30087c09c2SRikard Falkeborn static const struct regulator_ops dummy_ops;
3134abbd68SMark Brown
32e1326effSKrzysztof Kozlowski static const struct regulator_desc dummy_desc = {
33215b8b05SUwe Kleine-König .name = "regulator-dummy",
3434abbd68SMark Brown .id = -1,
3534abbd68SMark Brown .type = REGULATOR_VOLTAGE,
3634abbd68SMark Brown .owner = THIS_MODULE,
3734abbd68SMark Brown .ops = &dummy_ops,
3834abbd68SMark Brown };
3934abbd68SMark Brown
dummy_regulator_probe(struct platform_device * pdev)40a5023574SBill Pemberton static int dummy_regulator_probe(struct platform_device *pdev)
41c08957a2SMark Brown {
42c172708dSMark Brown struct regulator_config config = { };
43c08957a2SMark Brown int ret;
44c08957a2SMark Brown
450f82b6cfSMark Brown config.dev = &pdev->dev;
46c172708dSMark Brown config.init_data = &dummy_initdata;
47c172708dSMark Brown
48c6e5e92cSZenghui Yu dummy_regulator_rdev = devm_regulator_register(&pdev->dev, &dummy_desc,
49c6e5e92cSZenghui Yu &config);
50c08957a2SMark Brown if (IS_ERR(dummy_regulator_rdev)) {
51c08957a2SMark Brown ret = PTR_ERR(dummy_regulator_rdev);
52c08957a2SMark Brown pr_err("Failed to register regulator: %d\n", ret);
53c08957a2SMark Brown return ret;
54c08957a2SMark Brown }
55c08957a2SMark Brown
56c08957a2SMark Brown return 0;
57c08957a2SMark Brown }
58c08957a2SMark Brown
59c08957a2SMark Brown static struct platform_driver dummy_regulator_driver = {
60c08957a2SMark Brown .probe = dummy_regulator_probe,
61c08957a2SMark Brown .driver = {
62c08957a2SMark Brown .name = "reg-dummy",
63*259b93b2SDouglas Anderson .probe_type = PROBE_PREFER_ASYNCHRONOUS,
64c08957a2SMark Brown },
65c08957a2SMark Brown };
66c08957a2SMark Brown
6734abbd68SMark Brown static struct platform_device *dummy_pdev;
6834abbd68SMark Brown
regulator_dummy_init(void)6934abbd68SMark Brown void __init regulator_dummy_init(void)
7034abbd68SMark Brown {
7134abbd68SMark Brown int ret;
7234abbd68SMark Brown
7334abbd68SMark Brown dummy_pdev = platform_device_alloc("reg-dummy", -1);
7434abbd68SMark Brown if (!dummy_pdev) {
7534abbd68SMark Brown pr_err("Failed to allocate dummy regulator device\n");
7634abbd68SMark Brown return;
7734abbd68SMark Brown }
7834abbd68SMark Brown
7934abbd68SMark Brown ret = platform_device_add(dummy_pdev);
8034abbd68SMark Brown if (ret != 0) {
8134abbd68SMark Brown pr_err("Failed to register dummy regulator device: %d\n", ret);
8234abbd68SMark Brown platform_device_put(dummy_pdev);
8334abbd68SMark Brown return;
8434abbd68SMark Brown }
8534abbd68SMark Brown
86c08957a2SMark Brown ret = platform_driver_register(&dummy_regulator_driver);
87c08957a2SMark Brown if (ret != 0) {
88c08957a2SMark Brown pr_err("Failed to register dummy regulator driver: %d\n", ret);
8934abbd68SMark Brown platform_device_unregister(dummy_pdev);
9034abbd68SMark Brown }
9134abbd68SMark Brown }
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