dummy.c

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/*
 * dummy.c
 *
 * Copyright 2010 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This is useful for systems with mixed controllable and
 * non-controllable regulators, as well as for allowing testing on
 * systems with no controllable regulators.
 */

#include <linux/err.h>
#include <linux/export.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>

#include "dummy.h"

struct regulator_dev *dummy_regulator_rdev;

static struct regulator_init_data dummy_initdata;

static struct regulator_ops dummy_ops;

static struct regulator_desc dummy_desc = {
    .name = "regulator-dummy",
    .id = -1,
    .type = REGULATOR_VOLTAGE,
    .owner = THIS_MODULE,
    .ops = &dummy_ops,
};

static int __devinit dummy_regulator_probe(struct platform_device *pdev)
{
    struct regulator_config config = { };
    int ret;

    config.dev = &pdev->dev;
    config.init_data = &dummy_initdata;

    dummy_regulator_rdev = regulator_register(&dummy_desc, &config);
    if (IS_ERR(dummy_regulator_rdev)) {
        ret = PTR_ERR(dummy_regulator_rdev);
        pr_err("Failed to register regulator: %d\n", ret);
        return ret;
    }

    return 0;
}

static struct platform_driver dummy_regulator_driver = {
    .probe      = dummy_regulator_probe,
    .driver     = {
        .name       = "reg-dummy",
        .owner      = THIS_MODULE,
    },
};

static struct platform_device *dummy_pdev;

void __init regulator_dummy_init(void)
{
    int ret;

    dummy_pdev = platform_device_alloc("reg-dummy", -1);
    if (!dummy_pdev) {
        pr_err("Failed to allocate dummy regulator device\n");
        return;
    }

    ret = platform_device_add(dummy_pdev);
    if (ret != 0) {
        pr_err("Failed to register dummy regulator device: %d\n", ret);
        platform_device_put(dummy_pdev);
        return;
    }

    ret = platform_driver_register(&dummy_regulator_driver);
    if (ret != 0) {
        pr_err("Failed to register dummy regulator driver: %d\n", ret);
        platform_device_unregister(dummy_pdev);
    }
}