1/* 2 * drivers/gpio/max7300.c 3 * 4 * Copyright (C) 2009 Wolfram Sang, Pengutronix 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * Check max730x.c for further details. 11 */ 12 13#include <linux/module.h> 14#include <linux/init.h> 15#include <linux/platform_device.h> 16#include <linux/mutex.h> 17#include <linux/i2c.h> 18#include <linux/spi/max7301.h> 19#include <linux/slab.h> 20 21static int max7300_i2c_write(struct device *dev, unsigned int reg, 22 unsigned int val) 23{ 24 struct i2c_client *client = to_i2c_client(dev); 25 26 return i2c_smbus_write_byte_data(client, reg, val); 27} 28 29static int max7300_i2c_read(struct device *dev, unsigned int reg) 30{ 31 struct i2c_client *client = to_i2c_client(dev); 32 33 return i2c_smbus_read_byte_data(client, reg); 34} 35 36static int __devinit max7300_probe(struct i2c_client *client, 37 const struct i2c_device_id *id) 38{ 39 struct max7301 *ts; 40 int ret; 41 42 if (!i2c_check_functionality(client->adapter, 43 I2C_FUNC_SMBUS_BYTE_DATA)) 44 return -EIO; 45 46 ts = kzalloc(sizeof(struct max7301), GFP_KERNEL); 47 if (!ts) 48 return -ENOMEM; 49 50 ts->read = max7300_i2c_read; 51 ts->write = max7300_i2c_write; 52 ts->dev = &client->dev; 53 54 ret = __max730x_probe(ts); 55 if (ret) 56 kfree(ts); 57 return ret; 58} 59 60static int __devexit max7300_remove(struct i2c_client *client) 61{ 62 return __max730x_remove(&client->dev); 63} 64 65static const struct i2c_device_id max7300_id[] = { 66 { "max7300", 0 }, 67 { } 68}; 69MODULE_DEVICE_TABLE(i2c, max7300_id); 70 71static struct i2c_driver max7300_driver = { 72 .driver = { 73 .name = "max7300", 74 .owner = THIS_MODULE, 75 }, 76 .probe = max7300_probe, 77 .remove = __devexit_p(max7300_remove), 78 .id_table = max7300_id, 79}; 80 81static int __init max7300_init(void) 82{ 83 return i2c_add_driver(&max7300_driver); 84} 85subsys_initcall(max7300_init); 86 87static void __exit max7300_exit(void) 88{ 89 i2c_del_driver(&max7300_driver); 90} 91module_exit(max7300_exit); 92 93MODULE_AUTHOR("Wolfram Sang"); 94MODULE_LICENSE("GPL v2"); 95MODULE_DESCRIPTION("MAX7300 GPIO-Expander"); 96