linux/drivers/regulator/dummy.c
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   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
  26struct regulator_dev *dummy_regulator_rdev;
  27
  28static struct regulator_init_data dummy_initdata;
  29
  30static struct regulator_ops dummy_ops;
  31
  32static 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 = 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
  58static struct platform_driver dummy_regulator_driver = {
  59        .probe          = dummy_regulator_probe,
  60        .driver         = {
  61                .name           = "reg-dummy",
  62                .owner          = THIS_MODULE,
  63        },
  64};
  65
  66static struct platform_device *dummy_pdev;
  67
  68void __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
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