92 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * dummy.c4 *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 and10 * non-controllable regulators, as well as for allowing testing on11 * 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 .probe_type = PROBE_PREFER_ASYNCHRONOUS,64 },65};66 67static struct platform_device *dummy_pdev;68 69void __init regulator_dummy_init(void)70{71 int ret;72 73 dummy_pdev = platform_device_alloc("reg-dummy", -1);74 if (!dummy_pdev) {75 pr_err("Failed to allocate dummy regulator device\n");76 return;77 }78 79 ret = platform_device_add(dummy_pdev);80 if (ret != 0) {81 pr_err("Failed to register dummy regulator device: %d\n", ret);82 platform_device_put(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