]> err.no Git - linux-2.6/blob - drivers/of/of_i2c.c
Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6] / drivers / of / of_i2c.c
1 /*
2  * OF helpers for the I2C API
3  *
4  * Copyright (c) 2008 Jochen Friedrich <jochen@scram.de>
5  *
6  * Based on a previous patch from Jon Smirl <jonsmirl@gmail.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  */
13
14 #include <linux/i2c.h>
15 #include <linux/of.h>
16 #include <linux/of_i2c.h>
17 #include <linux/module.h>
18
19 void of_register_i2c_devices(struct i2c_adapter *adap,
20                              struct device_node *adap_node)
21 {
22         void *result;
23         struct device_node *node;
24
25         for_each_child_of_node(adap_node, node) {
26                 struct i2c_board_info info = {};
27                 const u32 *addr;
28                 int len;
29
30                 if (of_modalias_node(node, info.type, sizeof(info.type)) < 0)
31                         continue;
32
33                 addr = of_get_property(node, "reg", &len);
34                 if (!addr || len < sizeof(int) || *addr > (1 << 10) - 1) {
35                         printk(KERN_ERR
36                                "of-i2c: invalid i2c device entry\n");
37                         continue;
38                 }
39
40                 info.irq = irq_of_parse_and_map(node, 0);
41
42                 info.addr = *addr;
43
44                 request_module(info.type);
45
46                 result = i2c_new_device(adap, &info);
47                 if (result == NULL) {
48                         printk(KERN_ERR
49                                "of-i2c: Failed to load driver for %s\n",
50                                info.type);
51                         irq_dispose_mapping(info.irq);
52                         continue;
53                 }
54         }
55 }
56 EXPORT_SYMBOL(of_register_i2c_devices);
57
58 MODULE_LICENSE("GPL");