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Linux/drivers/regulator/dummy.c

  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 

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