LXR linux/drivers/gpio/gpio-max7300.c

   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
  39        if (!i2c_check_functionality(client->adapter,
  40                        I2C_FUNC_SMBUS_BYTE_DATA))
  41                return -EIO;
  42
  43        ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL);
  44        if (!ts)
  45                return -ENOMEM;
  46
  47        ts->read = max7300_i2c_read;
  48        ts->write = max7300_i2c_write;
  49        ts->dev = &client->dev;
  50
  51        return __max730x_probe(ts);
  52}
  53
  54static int max7300_remove(struct i2c_client *client)
  55{
  56        return __max730x_remove(&client->dev);
  57}
  58
  59static const struct i2c_device_id max7300_id[] = {
  60        { "max7300", 0 },
  61        { }
  62};
  63MODULE_DEVICE_TABLE(i2c, max7300_id);
  64
  65static struct i2c_driver max7300_driver = {
  66        .driver = {
  67                .name = "max7300",
  68        },
  69        .probe = max7300_probe,
  70        .remove = max7300_remove,
  71        .id_table = max7300_id,
  72};
  73
  74static int __init max7300_init(void)
  75{
  76        return i2c_add_driver(&max7300_driver);
  77}
  78subsys_initcall(max7300_init);
  79
  80static void __exit max7300_exit(void)
  81{
  82        i2c_del_driver(&max7300_driver);
  83}
  84module_exit(max7300_exit);
  85
  86MODULE_AUTHOR("Wolfram Sang");
  87MODULE_LICENSE("GPL v2");
  88MODULE_DESCRIPTION("MAX7300 GPIO-Expander");
  89