1 /* 2 * dummy.c 3 * 4 * Copyright 2010 Wolfson Microelectronics PLC. 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of the 11 * License, or (at your option) any later version. 12 * 13 * This is useful for systems with mixed controllable and 14 * non-controllable regulators, as well as for allowing testing on 15 * systems with no controllable regulators. 16 */ 17 18 #include <linux/err.h> 19 #include <linux/export.h> 20 #include <linux/platform_device.h> 21 #include <linux/regulator/driver.h> 22 #include <linux/regulator/machine.h> 23 24 #include "dummy.h" 25 26 struct regulator_dev *dummy_regulator_rdev; 27 28 static struct regulator_init_data dummy_initdata = { 29 .constraints = { 30 .always_on = 1, 31 }, 32 }; 33 34 static struct regulator_ops dummy_ops; 35 36 static const struct regulator_desc dummy_desc = { 37 .name = "regulator-dummy", 38 .id = -1, 39 .type = REGULATOR_VOLTAGE, 40 .owner = THIS_MODULE, 41 .ops = &dummy_ops, 42 }; 43 44 static int dummy_regulator_probe(struct platform_device *pdev) 45 { 46 struct regulator_config config = { }; 47 int ret; 48 49 config.dev = &pdev->dev; 50 config.init_data = &dummy_initdata; 51 52 dummy_regulator_rdev = regulator_register(&dummy_desc, &config); 53 if (IS_ERR(dummy_regulator_rdev)) { 54 ret = PTR_ERR(dummy_regulator_rdev); 55 pr_err("Failed to register regulator: %d\n", ret); 56 return ret; 57 } 58 59 return 0; 60 } 61 62 static struct platform_driver dummy_regulator_driver = { 63 .probe = dummy_regulator_probe, 64 .driver = { 65 .name = "reg-dummy", 66 }, 67 }; 68 69 static struct platform_device *dummy_pdev; 70 71 void __init regulator_dummy_init(void) 72 { 73 int ret; 74 75 dummy_pdev = platform_device_alloc("reg-dummy", -1); 76 if (!dummy_pdev) { 77 pr_err("Failed to allocate dummy regulator device\n"); 78 return; 79 } 80 81 ret = platform_device_add(dummy_pdev); 82 if (ret != 0) { 83 pr_err("Failed to register dummy regulator device: %d\n", ret); 84 platform_device_put(dummy_pdev); 85 return; 86 } 87 88 ret = platform_driver_register(&dummy_regulator_driver); 89 if (ret != 0) { 90 pr_err("Failed to register dummy regulator driver: %d\n", ret); 91 platform_device_unregister(dummy_pdev); 92 } 93 } 94