// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2009 Wolfram Sang, Pengutronix
 *
 * 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 max7300_probe(struct i2c_client *client)
{
        struct max7301 *ts;

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

        ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL);
        if (!ts)
                return -ENOMEM;

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

        return __max730x_probe(ts);
}

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

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

static struct i2c_driver max7300_driver = {
        .driver = {
                .name = "max7300",
        },
        .probe = max7300_probe,
        .remove = 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");