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e952805d | 1 | /* |
e952805d WS |
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> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
e952805d WS |
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"); |