gpio-max7300.c

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/*
 * Copyright (C) 2009 Wolfram Sang, Pengutronix
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Check max730x.c for further details.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/i2c.h>
#include <linux/spi/max7301.h>
#include <linux/slab.h>

static int max7300_i2c_write(struct device *dev, unsigned int reg,
                unsigned int val)
{
    struct i2c_client *client = to_i2c_client(dev);

    return i2c_smbus_write_byte_data(client, reg, val);
}

static int max7300_i2c_read(struct device *dev, unsigned int reg)
{
    struct i2c_client *client = to_i2c_client(dev);

    return i2c_smbus_read_byte_data(client, reg);
}

static int __devinit max7300_probe(struct i2c_client *client,
             const struct i2c_device_id *id)
{
    struct max7301 *ts;
    int ret;

    if (!i2c_check_functionality(client->adapter,
            I2C_FUNC_SMBUS_BYTE_DATA))
        return -EIO;

    ts = kzalloc(sizeof(struct max7301), GFP_KERNEL);
    if (!ts)
        return -ENOMEM;

    ts->read = max7300_i2c_read;
    ts->write = max7300_i2c_write;
    ts->dev = &client->dev;

    ret = __max730x_probe(ts);
    if (ret)
        kfree(ts);
    return ret;
}

static int __devexit max7300_remove(struct i2c_client *client)
{
    return __max730x_remove(&client->dev);
}

static const struct i2c_device_id max7300_id[] = {
    { "max7300", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, max7300_id);

static struct i2c_driver max7300_driver = {
    .driver = {
        .name = "max7300",
        .owner = THIS_MODULE,
    },
    .probe = max7300_probe,
    .remove = __devexit_p(max7300_remove),
    .id_table = max7300_id,
};

static int __init max7300_init(void)
{
    return i2c_add_driver(&max7300_driver);
}
subsys_initcall(max7300_init);

static void __exit max7300_exit(void)
{
    i2c_del_driver(&max7300_driver);
}
module_exit(max7300_exit);

MODULE_AUTHOR("Wolfram Sang");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MAX7300 GPIO-Expander");