Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[platform/adaptation/renesas_rcar/renesas_kernel.git] / 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
19 static 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
27 static 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
34 static 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
58 static int __devexit max7300_remove(struct i2c_client *client)
59 {
60         return __max730x_remove(&client->dev);
61 }
62
63 static const struct i2c_device_id max7300_id[] = {
64         { "max7300", 0 },
65         { }
66 };
67 MODULE_DEVICE_TABLE(i2c, max7300_id);
68
69 static 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
79 static int __init max7300_init(void)
80 {
81         return i2c_add_driver(&max7300_driver);
82 }
83 subsys_initcall(max7300_init);
84
85 static void __exit max7300_exit(void)
86 {
87         i2c_del_driver(&max7300_driver);
88 }
89 module_exit(max7300_exit);
90
91 MODULE_AUTHOR("Wolfram Sang");
92 MODULE_LICENSE("GPL v2");
93 MODULE_DESCRIPTION("MAX7300 GPIO-Expander");