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
  30 static struct regulator_ops dummy_ops;
  31
  32 static struct regulator_desc dummy_desc = {
  33         .name = "dummy",
  34         .id = -1,
  35         .type = REGULATOR_VOLTAGE,
  36         .owner = THIS_MODULE,
  37         .ops = &dummy_ops,
  38 };
  39
  40 static int __devinit dummy_regulator_probe(struct platform_device *pdev)
  41 {
  42         int ret;
  43
  44         dummy_regulator_rdev = regulator_register(&dummy_desc, NULL,
  45                                                   &dummy_initdata, NULL, NULL);
  46         if (IS_ERR(dummy_regulator_rdev)) {
  47                 ret = PTR_ERR(dummy_regulator_rdev);
  48                 pr_err("Failed to register regulator: %d\n", ret);
  49                 return ret;
  50         }
  51
  52         return 0;
  53 }
  54
  55 static struct platform_driver dummy_regulator_driver = {
  56         .probe          = dummy_regulator_probe,
  57         .driver         = {
  58                 .name           = "reg-dummy",
  59                 .owner          = THIS_MODULE,
  60         },
  61 };
  62
  63 static struct platform_device *dummy_pdev;
  64
  65 void __init regulator_dummy_init(void)
  66 {
  67         int ret;
  68
  69         dummy_pdev = platform_device_alloc("reg-dummy", -1);
  70         if (!dummy_pdev) {
  71                 pr_err("Failed to allocate dummy regulator device\n");
  72                 return;
  73         }
  74
  75         ret = platform_device_add(dummy_pdev);
  76         if (ret != 0) {
  77                 pr_err("Failed to register dummy regulator device: %d\n", ret);
  78                 platform_device_put(dummy_pdev);
  79                 return;
  80         }
  81
  82         ret = platform_driver_register(&dummy_regulator_driver);
  83         if (ret != 0) {
  84                 pr_err("Failed to register dummy regulator driver: %d\n", ret);
  85                 platform_device_unregister(dummy_pdev);
  86         }
  87 }