wm831x-i2c.c

Go to the documentation of this file.

/*
 * wm831x-i2c.c  --  I2C 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/i2c.h>
#include <linux/delay.h>
#include <linux/mfd/core.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/regmap.h>

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

static int wm831x_i2c_probe(struct i2c_client *i2c,
                const struct i2c_device_id *id)
{
    struct wm831x *wm831x;
    int ret;

    wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
    if (wm831x == NULL)
        return -ENOMEM;

    i2c_set_clientdata(i2c, wm831x);
    wm831x->dev = &i2c->dev;

    wm831x->regmap = devm_regmap_init_i2c(i2c, &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, id->driver_data, i2c->irq);
}

static int wm831x_i2c_remove(struct i2c_client *i2c)
{
    struct wm831x *wm831x = i2c_get_clientdata(i2c);

    wm831x_device_exit(wm831x);

    return 0;
}

static int wm831x_i2c_suspend(struct device *dev)
{
    struct wm831x *wm831x = dev_get_drvdata(dev);

    return wm831x_device_suspend(wm831x);
}

static void wm831x_i2c_shutdown(struct i2c_client *i2c)
{
    struct wm831x *wm831x = i2c_get_clientdata(i2c);

    wm831x_device_shutdown(wm831x);
}

static const struct i2c_device_id wm831x_i2c_id[] = {
    { "wm8310", WM8310 },
    { "wm8311", WM8311 },
    { "wm8312", WM8312 },
    { "wm8320", WM8320 },
    { "wm8321", WM8321 },
    { "wm8325", WM8325 },
    { "wm8326", WM8326 },
    { }
};
MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id);

static const struct dev_pm_ops wm831x_pm_ops = {
    .suspend = wm831x_i2c_suspend,
};

static struct i2c_driver wm831x_i2c_driver = {
    .driver = {
        .name = "wm831x",
        .owner = THIS_MODULE,
        .pm = &wm831x_pm_ops,
    },
    .probe = wm831x_i2c_probe,
    .remove = wm831x_i2c_remove,
    .shutdown = wm831x_i2c_shutdown,
    .id_table = wm831x_i2c_id,
};

static int __init wm831x_i2c_init(void)
{
    int ret;

    ret = i2c_add_driver(&wm831x_i2c_driver);
    if (ret != 0)
        pr_err("Failed to register wm831x I2C driver: %d\n", ret);

    return ret;
}
subsys_initcall(wm831x_i2c_init);

static void __exit wm831x_i2c_exit(void)
{
    i2c_del_driver(&wm831x_i2c_driver);
}
module_exit(wm831x_i2c_exit);