projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 612212a3 JF |
1 | /* |
| 2 | * OF helpers for the I2C API | |
| 3 | * | |
| 4 | * Copyright (c) 2008 Jochen Friedrich <[email protected]> | |
| 5 | * | |
| 6 | * Based on a previous patch from Jon Smirl <[email protected]> | |
| 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> | |
| 4c60071c | 15 | #include <linux/irq.h> |
| 612212a3 | 16 | #include <linux/of.h> |
| f40987b6 | 17 | #include <linux/of_i2c.h> |
| 9fd04992 | 18 | #include <linux/of_irq.h> |
| 138decf8 | 19 | #include <linux/module.h> |
| 612212a3 | 20 | |
| 9fd04992 | 21 | void of_i2c_register_devices(struct i2c_adapter *adap) |
| 612212a3 JF |
22 | { |
| 23 | void *result; | |
| 24 | struct device_node *node; | |
| 25 | ||
| 9fd04992 GL |
26 | /* Only register child devices if the adapter has a node pointer set */ |
| 27 | if (!adap->dev.of_node) | |
| 28 | return; | |
| 29 | ||
| 30 | dev_dbg(&adap->dev, "of_i2c: walking child nodes\n"); | |
| 31 | ||
| 32 | for_each_child_of_node(adap->dev.of_node, node) { | |
| 612212a3 | 33 | struct i2c_board_info info = {}; |
| e6a437eb | 34 | struct dev_archdata dev_ad = {}; |
| 33714881 | 35 | const __be32 *addr; |
| 612212a3 JF |
36 | int len; |
| 37 | ||
| 9fd04992 GL |
38 | dev_dbg(&adap->dev, "of_i2c: register %s\n", node->full_name); |
| 39 | ||
| 40 | if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) { | |
| 41 | dev_err(&adap->dev, "of_i2c: modalias failure on %s\n", | |
| 42 | node->full_name); | |
| 3f07af49 | 43 | continue; |
| 9fd04992 | 44 | } |
| 3f07af49 | 45 | |
| 612212a3 | 46 | addr = of_get_property(node, "reg", &len); |
| 9fd04992 GL |
47 | if (!addr || (len < sizeof(int))) { |
| 48 | dev_err(&adap->dev, "of_i2c: invalid reg on %s\n", | |
| 49 | node->full_name); | |
| 612212a3 JF |
50 | continue; |
| 51 | } | |
| 52 | ||
| 33714881 | 53 | info.addr = be32_to_cpup(addr); |
| 9fd04992 GL |
54 | if (info.addr > (1 << 10) - 1) { |
| 55 | dev_err(&adap->dev, "of_i2c: invalid addr=%x on %s\n", | |
| 56 | info.addr, node->full_name); | |
| 57 | continue; | |
| 58 | } | |
| 612212a3 | 59 | |
| 9fd04992 GL |
60 | info.irq = irq_of_parse_and_map(node, 0); |
| 61 | info.of_node = of_node_get(node); | |
| e6a437eb AV |
62 | info.archdata = &dev_ad; |
| 63 | ||
| 02086264 | 64 | request_module("%s%s", I2C_MODULE_PREFIX, info.type); |
| 612212a3 JF |
65 | |
| 66 | result = i2c_new_device(adap, &info); | |
| 67 | if (result == NULL) { | |
| 9fd04992 GL |
68 | dev_err(&adap->dev, "of_i2c: Failure registering %s\n", |
| 69 | node->full_name); | |
| 70 | of_node_put(node); | |
| 612212a3 JF |
71 | irq_dispose_mapping(info.irq); |
| 72 | continue; | |
| 73 | } | |
| 74 | } | |
| 75 | } | |
| 9fd04992 | 76 | EXPORT_SYMBOL(of_i2c_register_devices); |
| 138decf8 | 77 | |
| 2526c151 JS |
78 | static int of_dev_node_match(struct device *dev, void *data) |
| 79 | { | |
| 61c7a080 | 80 | return dev->of_node == data; |
| 2526c151 JS |
81 | } |
| 82 | ||
| 83 | /* must call put_device() when done with returned i2c_client device */ | |
| 84 | struct i2c_client *of_find_i2c_device_by_node(struct device_node *node) | |
| 85 | { | |
| 86 | struct device *dev; | |
| 87 | ||
| 88 | dev = bus_find_device(&i2c_bus_type, NULL, node, | |
| 89 | of_dev_node_match); | |
| 90 | if (!dev) | |
| 91 | return NULL; | |
| 92 | ||
| 93 | return to_i2c_client(dev); | |
| 94 | } | |
| 95 | EXPORT_SYMBOL(of_find_i2c_device_by_node); | |
| 96 | ||
| 138decf8 | 97 | MODULE_LICENSE("GPL"); |