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 = "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 }