m68k: ptrace fixes
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / of / of_i2c.c
blobfa65a2b2ae2e44737edb5d4e19daf767e331bd9c
1 /*
2 * OF helpers for the I2C API
4 * Copyright (c) 2008 Jochen Friedrich <jochen@scram.de>
6 * Based on a previous patch from Jon Smirl <jonsmirl@gmail.com>
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.
14 #include <linux/i2c.h>
15 #include <linux/of.h>
16 #include <linux/of_i2c.h>
17 #include <linux/module.h>
19 void of_register_i2c_devices(struct i2c_adapter *adap,
20 struct device_node *adap_node)
22 void *result;
23 struct device_node *node;
25 for_each_child_of_node(adap_node, node) {
26 struct i2c_board_info info = {};
27 struct dev_archdata dev_ad = {};
28 const u32 *addr;
29 int len;
31 if (of_modalias_node(node, info.type, sizeof(info.type)) < 0)
32 continue;
34 addr = of_get_property(node, "reg", &len);
35 if (!addr || len < sizeof(int) || *addr > (1 << 10) - 1) {
36 printk(KERN_ERR
37 "of-i2c: invalid i2c device entry\n");
38 continue;
41 info.irq = irq_of_parse_and_map(node, 0);
43 info.addr = *addr;
45 dev_archdata_set_node(&dev_ad, node);
46 info.archdata = &dev_ad;
48 request_module("%s", info.type);
50 result = i2c_new_device(adap, &info);
51 if (result == NULL) {
52 printk(KERN_ERR
53 "of-i2c: Failed to load driver for %s\n",
54 info.type);
55 irq_dispose_mapping(info.irq);
56 continue;
60 * Get the node to not lose the dev_archdata->of_node.
61 * Currently there is no way to put it back, as well as no
62 * of_unregister_i2c_devices() call.
64 of_node_get(node);
67 EXPORT_SYMBOL(of_register_i2c_devices);
69 static int of_dev_node_match(struct device *dev, void *data)
71 return dev_archdata_get_node(&dev->archdata) == data;
74 /* must call put_device() when done with returned i2c_client device */
75 struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
77 struct device *dev;
79 dev = bus_find_device(&i2c_bus_type, NULL, node,
80 of_dev_node_match);
81 if (!dev)
82 return NULL;
84 return to_i2c_client(dev);
86 EXPORT_SYMBOL(of_find_i2c_device_by_node);
88 MODULE_LICENSE("GPL");