tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 __devinit 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 = kzalloc(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 if (ret)
54 kfree(ts);
55 return ret;
56}
57
58static int __devexit max7300_remove(struct i2c_client *client)
59{
60 return __max730x_remove(&client->dev);
61}
62
63static const struct i2c_device_id max7300_id[] = {
64 { "max7300", 0 },
65 { }
66};
67MODULE_DEVICE_TABLE(i2c, max7300_id);
68
69static struct i2c_driver max7300_driver = {
70 .driver = {
71 .name = "max7300",
72 .owner = THIS_MODULE,
73 },
74 .probe = max7300_probe,
75 .remove = __devexit_p(max7300_remove),
76 .id_table = max7300_id,
77};
78
79static int __init max7300_init(void)
80{
81 return i2c_add_driver(&max7300_driver);
82}
83subsys_initcall(max7300_init);
84
85static void __exit max7300_exit(void)
86{
87 i2c_del_driver(&max7300_driver);
88}
89module_exit(max7300_exit);
90
91MODULE_AUTHOR("Wolfram Sang");
92MODULE_LICENSE("GPL v2");
93MODULE_DESCRIPTION("MAX7300 GPIO-Expander");