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/device/faux.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 faux_device *fdev) 41 { 42 struct regulator_config config = { }; 43 int ret; 44 45 config.dev = &fdev->dev; 46 config.init_data = &dummy_initdata; 47 48 dummy_regulator_rdev = devm_regulator_register(&fdev->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 59 struct faux_device_ops dummy_regulator_driver = { 60 .probe = dummy_regulator_probe, 61 }; 62 63 static struct faux_device *dummy_fdev; 64 65 void __init regulator_dummy_init(void) 66 { 67 dummy_fdev = faux_device_create("reg-dummy", NULL, &dummy_regulator_driver); 68 if (!dummy_fdev) { 69 pr_err("Failed to allocate dummy regulator device\n"); 70 return; 71 } 72 } 73