LXR 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
  26struct regulator_dev *dummy_regulator_rdev;
  27
  28static struct regulator_init_data dummy_initdata = {
  29        .constraints = {
  30                .always_on = 1,
  31        },
  32};
  33
  34static struct regulator_ops dummy_ops;
  35
  36static 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
  44static 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
  62static struct platform_driver dummy_regulator_driver = {
  63        .probe          = dummy_regulator_probe,
  64        .driver         = {
  65                .name           = "reg-dummy",
  66        },
  67};
  68
  69static struct platform_device *dummy_pdev;
  70
  71void __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