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e952805d WS |
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 | ||
20 | static int max7300_i2c_write(struct device *dev, unsigned int reg, | |
21 | unsigned int val) | |
22 | { | |
23 | struct i2c_client *client = to_i2c_client(dev); | |
24 | ||
25 | return i2c_smbus_write_byte_data(client, reg, val); | |
26 | } | |
27 | ||
28 | static int max7300_i2c_read(struct device *dev, unsigned int reg) | |
29 | { | |
30 | struct i2c_client *client = to_i2c_client(dev); | |
31 | ||
32 | return i2c_smbus_read_byte_data(client, reg); | |
33 | } | |
34 | ||
35 | static int __devinit max7300_probe(struct i2c_client *client, | |
36 | const struct i2c_device_id *id) | |
37 | { | |
38 | struct max7301 *ts; | |
39 | int ret; | |
40 | ||
41 | if (!i2c_check_functionality(client->adapter, | |
42 | I2C_FUNC_SMBUS_BYTE_DATA)) | |
43 | return -EIO; | |
44 | ||
45 | ts = kzalloc(sizeof(struct max7301), GFP_KERNEL); | |
46 | if (!ts) | |
47 | return -ENOMEM; | |
48 | ||
49 | ts->read = max7300_i2c_read; | |
50 | ts->write = max7300_i2c_write; | |
51 | ts->dev = &client->dev; | |
52 | ||
53 | ret = __max730x_probe(ts); | |
54 | if (ret) | |
55 | kfree(ts); | |
56 | return ret; | |
57 | } | |
58 | ||
59 | static int __devexit max7300_remove(struct i2c_client *client) | |
60 | { | |
61 | return __max730x_remove(&client->dev); | |
62 | } | |
63 | ||
64 | static const struct i2c_device_id max7300_id[] = { | |
65 | { "max7300", 0 }, | |
66 | { } | |
67 | }; | |
68 | MODULE_DEVICE_TABLE(i2c, max7300_id); | |
69 | ||
70 | static struct i2c_driver max7300_driver = { | |
71 | .driver = { | |
72 | .name = "max7300", | |
73 | .owner = THIS_MODULE, | |
74 | }, | |
75 | .probe = max7300_probe, | |
76 | .remove = __devexit_p(max7300_remove), | |
77 | .id_table = max7300_id, | |
78 | }; | |
79 | ||
80 | static int __init max7300_init(void) | |
81 | { | |
82 | return i2c_add_driver(&max7300_driver); | |
83 | } | |
84 | subsys_initcall(max7300_init); | |
85 | ||
86 | static void __exit max7300_exit(void) | |
87 | { | |
88 | i2c_del_driver(&max7300_driver); | |
89 | } | |
90 | module_exit(max7300_exit); | |
91 | ||
92 | MODULE_AUTHOR("Wolfram Sang"); | |
93 | MODULE_LICENSE("GPL v2"); | |
94 | MODULE_DESCRIPTION("MAX7300 GPIO-Expander"); |