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 30 static struct regulator_ops dummy_ops; 31 32 static 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 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 = regulator_register(&dummy_desc, &config); 49 if (IS_ERR(dummy_regulator_rdev)) { 50 ret = PTR_ERR(dummy_regulator_rdev); 51 pr_err("Failed to register regulator: %d\n", ret); 52 return ret; 53 } 54 55 return 0; 56 } 57 58 static struct platform_driver dummy_regulator_driver = { 59 .probe = dummy_regulator_probe, 60 .driver = { 61 .name = "reg-dummy", 62 .owner = THIS_MODULE, 63 }, 64 }; 65 66 static struct platform_device *dummy_pdev; 67 68 void __init regulator_dummy_init(void) 69 { 70 int ret; 71 72 dummy_pdev = platform_device_alloc("reg-dummy", -1); 73 if (!dummy_pdev) { 74 pr_err("Failed to allocate dummy regulator device\n"); 75 return; 76 } 77 78 ret = platform_device_add(dummy_pdev); 79 if (ret != 0) { 80 pr_err("Failed to register dummy regulator device: %d\n", ret); 81 platform_device_put(dummy_pdev); 82 return; 83 } 84 85 ret = platform_driver_register(&dummy_regulator_driver); 86 if (ret != 0) { 87 pr_err("Failed to register dummy regulator driver: %d\n", ret); 88 platform_device_unregister(dummy_pdev); 89 } 90 } 91