release/src-rt-6.x.4708/linux/linux-2.6.36/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/platform_device.h>
  20 #include <linux/regulator/driver.h>
  21 #include <linux/regulator/machine.h>
  22
  23 #include "dummy.h"
  24
  25 struct regulator_dev *dummy_regulator_rdev;
  26
  27 static struct regulator_init_data dummy_initdata;
  28
  29 static struct regulator_ops dummy_ops;
  30
  31 static struct regulator_desc dummy_desc = {
  32         .name = "dummy",
  33         .id = -1,
  34         .type = REGULATOR_VOLTAGE,
  35         .owner = THIS_MODULE,
  36         .ops = &dummy_ops,
  37 };
  38
  39 static struct platform_device *dummy_pdev;
  40
  41 void __init regulator_dummy_init(void)
  42 {
  43         int ret;
  44
  45         dummy_pdev = platform_device_alloc("reg-dummy", -1);
  46         if (!dummy_pdev) {
  47                 pr_err("Failed to allocate dummy regulator device\n");
  48                 return;
  49         }
  50
  51         ret = platform_device_add(dummy_pdev);
  52         if (ret != 0) {
  53                 pr_err("Failed to register dummy regulator device: %d\n", ret);
  54                 platform_device_put(dummy_pdev);
  55                 return;
  56         }
  57
  58         dummy_regulator_rdev = regulator_register(&dummy_desc, NULL,
  59                                                   &dummy_initdata, NULL);
  60         if (IS_ERR(dummy_regulator_rdev)) {
  61                 ret = PTR_ERR(dummy_regulator_rdev);
  62                 pr_err("Failed to register regulator: %d\n", ret);
  63                 platform_device_unregister(dummy_pdev);
  64                 return;
  65         }
  66 }