wm831x-spi.c

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/*
 * wm831x-spi.c  --  SPI access for Wolfson WM831x PMICs
 *
 * Copyright 2009,2010 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.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/spi/spi.h>
#include <linux/regmap.h>
#include <linux/err.h>

#include <linux/mfd/wm831x/core.h>

static int __devinit wm831x_spi_probe(struct spi_device *spi)
{
    const struct spi_device_id *id = spi_get_device_id(spi);
    struct wm831x *wm831x;
    enum wm831x_parent type;
    int ret;

    type = (enum wm831x_parent)id->driver_data;

    wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL);
    if (wm831x == NULL)
        return -ENOMEM;

    spi->bits_per_word = 16;
    spi->mode = SPI_MODE_0;

    dev_set_drvdata(&spi->dev, wm831x);
    wm831x->dev = &spi->dev;

    wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config);
    if (IS_ERR(wm831x->regmap)) {
        ret = PTR_ERR(wm831x->regmap);
        dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
            ret);
        return ret;
    }

    return wm831x_device_init(wm831x, type, spi->irq);
}

static int __devexit wm831x_spi_remove(struct spi_device *spi)
{
    struct wm831x *wm831x = dev_get_drvdata(&spi->dev);

    wm831x_device_exit(wm831x);

    return 0;
}

static int wm831x_spi_suspend(struct device *dev)
{
    struct wm831x *wm831x = dev_get_drvdata(dev);

    return wm831x_device_suspend(wm831x);
}

static void wm831x_spi_shutdown(struct spi_device *spi)
{
    struct wm831x *wm831x = dev_get_drvdata(&spi->dev);

    wm831x_device_shutdown(wm831x);
}

static const struct dev_pm_ops wm831x_spi_pm = {
    .freeze = wm831x_spi_suspend,
    .suspend = wm831x_spi_suspend,
};

static const struct spi_device_id wm831x_spi_ids[] = {
    { "wm8310", WM8310 },
    { "wm8311", WM8311 },
    { "wm8312", WM8312 },
    { "wm8320", WM8320 },
    { "wm8321", WM8321 },
    { "wm8325", WM8325 },
    { "wm8326", WM8326 },
    { },
};
MODULE_DEVICE_TABLE(spi, wm831x_spi_ids);

static struct spi_driver wm831x_spi_driver = {
    .driver = {
        .name   = "wm831x",
        .owner  = THIS_MODULE,
        .pm = &wm831x_spi_pm,
    },
    .id_table   = wm831x_spi_ids,
    .probe      = wm831x_spi_probe,
    .remove     = __devexit_p(wm831x_spi_remove),
    .shutdown   = wm831x_spi_shutdown,
};

static int __init wm831x_spi_init(void)
{
    int ret;

    ret = spi_register_driver(&wm831x_spi_driver);
    if (ret != 0)
        pr_err("Failed to register WM831x SPI driver: %d\n", ret);

    return 0;
}
subsys_initcall(wm831x_spi_init);

static void __exit wm831x_spi_exit(void)
{
    spi_unregister_driver(&wm831x_spi_driver);
}
module_exit(wm831x_spi_exit);

MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mark Brown");