linux/drivers/gpio/gpio-max7300.c
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   1/*
   2 * Copyright (C) 2009 Wolfram Sang, Pengutronix
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 *
   8 * Check max730x.c for further details.
   9 */
  10
  11#include <linux/module.h>
  12#include <linux/init.h>
  13#include <linux/platform_device.h>
  14#include <linux/mutex.h>
  15#include <linux/i2c.h>
  16#include <linux/spi/max7301.h>
  17#include <linux/slab.h>
  18
  19static int max7300_i2c_write(struct device *dev, unsigned int reg,
  20                                unsigned int val)
  21{
  22        struct i2c_client *client = to_i2c_client(dev);
  23
  24        return i2c_smbus_write_byte_data(client, reg, val);
  25}
  26
  27static int max7300_i2c_read(struct device *dev, unsigned int reg)
  28{
  29        struct i2c_client *client = to_i2c_client(dev);
  30
  31        return i2c_smbus_read_byte_data(client, reg);
  32}
  33
  34static int max7300_probe(struct i2c_client *client,
  35                         const struct i2c_device_id *id)
  36{
  37        struct max7301 *ts;
  38        int ret;
  39
  40        if (!i2c_check_functionality(client->adapter,
  41                        I2C_FUNC_SMBUS_BYTE_DATA))
  42                return -EIO;
  43
  44        ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL);
  45        if (!ts)
  46                return -ENOMEM;
  47
  48        ts->read = max7300_i2c_read;
  49        ts->write = max7300_i2c_write;
  50        ts->dev = &client->dev;
  51
  52        ret = __max730x_probe(ts);
  53        return ret;
  54}
  55
  56static int max7300_remove(struct i2c_client *client)
  57{
  58        return __max730x_remove(&client->dev);
  59}
  60
  61static const struct i2c_device_id max7300_id[] = {
  62        { "max7300", 0 },
  63        { }
  64};
  65MODULE_DEVICE_TABLE(i2c, max7300_id);
  66
  67static struct i2c_driver max7300_driver = {
  68        .driver = {
  69                .name = "max7300",
  70                .owner = THIS_MODULE,
  71        },
  72        .probe = max7300_probe,
  73        .remove = max7300_remove,
  74        .id_table = max7300_id,
  75};
  76
  77static int __init max7300_init(void)
  78{
  79        return i2c_add_driver(&max7300_driver);
  80}
  81subsys_initcall(max7300_init);
  82
  83static void __exit max7300_exit(void)
  84{
  85        i2c_del_driver(&max7300_driver);
  86}
  87module_exit(max7300_exit);
  88
  89MODULE_AUTHOR("Wolfram Sang");
  90MODULE_LICENSE("GPL v2");
  91MODULE_DESCRIPTION("MAX7300 GPIO-Expander");
  92
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