Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 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> |
Robert P. J. Day | f40987b | 2008-07-08 06:38:24 -0400 | [diff] [blame] | 16 | #include <linux/of_i2c.h> |
Grant Likely | 9fd0499 | 2010-06-08 07:48:18 -0600 | [diff] [blame^] | 17 | #include <linux/of_irq.h> |
Adrian Bunk | 138decf | 2008-04-23 19:51:34 +1000 | [diff] [blame] | 18 | #include <linux/module.h> |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 19 | |
Grant Likely | 9fd0499 | 2010-06-08 07:48:18 -0600 | [diff] [blame^] | 20 | void of_i2c_register_devices(struct i2c_adapter *adap) |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 21 | { |
| 22 | void *result; |
| 23 | struct device_node *node; |
| 24 | |
Grant Likely | 9fd0499 | 2010-06-08 07:48:18 -0600 | [diff] [blame^] | 25 | /* Only register child devices if the adapter has a node pointer set */ |
| 26 | if (!adap->dev.of_node) |
| 27 | return; |
| 28 | |
| 29 | dev_dbg(&adap->dev, "of_i2c: walking child nodes\n"); |
| 30 | |
| 31 | for_each_child_of_node(adap->dev.of_node, node) { |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 32 | struct i2c_board_info info = {}; |
Anton Vorontsov | e6a437e | 2008-11-28 09:13:45 +0000 | [diff] [blame] | 33 | struct dev_archdata dev_ad = {}; |
Jeremy Kerr | 3371488 | 2010-01-30 01:45:26 -0700 | [diff] [blame] | 34 | const __be32 *addr; |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 35 | int len; |
| 36 | |
Grant Likely | 9fd0499 | 2010-06-08 07:48:18 -0600 | [diff] [blame^] | 37 | dev_dbg(&adap->dev, "of_i2c: register %s\n", node->full_name); |
| 38 | |
| 39 | if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) { |
| 40 | dev_err(&adap->dev, "of_i2c: modalias failure on %s\n", |
| 41 | node->full_name); |
Grant Likely | 3f07af4 | 2008-07-25 22:25:13 -0400 | [diff] [blame] | 42 | continue; |
Grant Likely | 9fd0499 | 2010-06-08 07:48:18 -0600 | [diff] [blame^] | 43 | } |
Grant Likely | 3f07af4 | 2008-07-25 22:25:13 -0400 | [diff] [blame] | 44 | |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 45 | addr = of_get_property(node, "reg", &len); |
Grant Likely | 9fd0499 | 2010-06-08 07:48:18 -0600 | [diff] [blame^] | 46 | if (!addr || (len < sizeof(int))) { |
| 47 | dev_err(&adap->dev, "of_i2c: invalid reg on %s\n", |
| 48 | node->full_name); |
| 49 | continue; |
| 50 | } |
| 51 | |
| 52 | info.addr = be32_to_cpup(addr); |
| 53 | if (info.addr > (1 << 10) - 1) { |
| 54 | dev_err(&adap->dev, "of_i2c: invalid addr=%x on %s\n", |
| 55 | info.addr, node->full_name); |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 56 | continue; |
| 57 | } |
| 58 | |
| 59 | info.irq = irq_of_parse_and_map(node, 0); |
Grant Likely | 9fd0499 | 2010-06-08 07:48:18 -0600 | [diff] [blame^] | 60 | info.of_node = of_node_get(node); |
Anton Vorontsov | e6a437e | 2008-11-28 09:13:45 +0000 | [diff] [blame] | 61 | info.archdata = &dev_ad; |
| 62 | |
Jon Smirl | 0721357 | 2008-10-20 02:13:15 +0000 | [diff] [blame] | 63 | request_module("%s", info.type); |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 64 | |
| 65 | result = i2c_new_device(adap, &info); |
| 66 | if (result == NULL) { |
Grant Likely | 9fd0499 | 2010-06-08 07:48:18 -0600 | [diff] [blame^] | 67 | dev_err(&adap->dev, "of_i2c: Failure registering %s\n", |
| 68 | node->full_name); |
| 69 | of_node_put(node); |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 70 | irq_dispose_mapping(info.irq); |
| 71 | continue; |
| 72 | } |
| 73 | } |
| 74 | } |
Grant Likely | 9fd0499 | 2010-06-08 07:48:18 -0600 | [diff] [blame^] | 75 | EXPORT_SYMBOL(of_i2c_register_devices); |
Adrian Bunk | 138decf | 2008-04-23 19:51:34 +1000 | [diff] [blame] | 76 | |
Jon Smirl | 2526c15 | 2009-01-09 15:49:06 -0700 | [diff] [blame] | 77 | static int of_dev_node_match(struct device *dev, void *data) |
| 78 | { |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 79 | return dev->of_node == data; |
Jon Smirl | 2526c15 | 2009-01-09 15:49:06 -0700 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | /* must call put_device() when done with returned i2c_client device */ |
| 83 | struct i2c_client *of_find_i2c_device_by_node(struct device_node *node) |
| 84 | { |
| 85 | struct device *dev; |
| 86 | |
| 87 | dev = bus_find_device(&i2c_bus_type, NULL, node, |
| 88 | of_dev_node_match); |
| 89 | if (!dev) |
| 90 | return NULL; |
| 91 | |
| 92 | return to_i2c_client(dev); |
| 93 | } |
| 94 | EXPORT_SYMBOL(of_find_i2c_device_by_node); |
| 95 | |
Adrian Bunk | 138decf | 2008-04-23 19:51:34 +1000 | [diff] [blame] | 96 | MODULE_LICENSE("GPL"); |