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> |
Adrian Bunk | 138decf | 2008-04-23 19:51:34 +1000 | [diff] [blame] | 17 | #include <linux/module.h> |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 18 | |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 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 = {}; |
Anton Vorontsov | e6a437e | 2008-11-28 09:13:45 +0000 | [diff] [blame] | 27 | struct dev_archdata dev_ad = {}; |
Jeremy Kerr | 3371488 | 2010-01-30 01:45:26 -0700 | [diff] [blame] | 28 | const __be32 *addr; |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 29 | int len; |
| 30 | |
Grant Likely | 3f07af4 | 2008-07-25 22:25:13 -0400 | [diff] [blame] | 31 | if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) |
| 32 | continue; |
| 33 | |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 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; |
| 39 | } |
| 40 | |
| 41 | info.irq = irq_of_parse_and_map(node, 0); |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 42 | |
Jeremy Kerr | 3371488 | 2010-01-30 01:45:26 -0700 | [diff] [blame] | 43 | info.addr = be32_to_cpup(addr); |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 44 | |
Anton Vorontsov | e6a437e | 2008-11-28 09:13:45 +0000 | [diff] [blame] | 45 | dev_archdata_set_node(&dev_ad, node); |
Grant Likely | d12d42f | 2010-04-13 16:12:28 -0700 | [diff] [blame] | 46 | info.of_node = node; |
Anton Vorontsov | e6a437e | 2008-11-28 09:13:45 +0000 | [diff] [blame] | 47 | info.archdata = &dev_ad; |
| 48 | |
Jon Smirl | 0721357 | 2008-10-20 02:13:15 +0000 | [diff] [blame] | 49 | request_module("%s", info.type); |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 50 | |
| 51 | result = i2c_new_device(adap, &info); |
| 52 | if (result == NULL) { |
| 53 | printk(KERN_ERR |
| 54 | "of-i2c: Failed to load driver for %s\n", |
| 55 | info.type); |
| 56 | irq_dispose_mapping(info.irq); |
| 57 | continue; |
| 58 | } |
Anton Vorontsov | e6a437e | 2008-11-28 09:13:45 +0000 | [diff] [blame] | 59 | |
| 60 | /* |
| 61 | * Get the node to not lose the dev_archdata->of_node. |
| 62 | * Currently there is no way to put it back, as well as no |
| 63 | * of_unregister_i2c_devices() call. |
| 64 | */ |
| 65 | of_node_get(node); |
Jochen Friedrich | 612212a | 2008-04-12 05:22:35 +1000 | [diff] [blame] | 66 | } |
| 67 | } |
| 68 | EXPORT_SYMBOL(of_register_i2c_devices); |
Adrian Bunk | 138decf | 2008-04-23 19:51:34 +1000 | [diff] [blame] | 69 | |
Jon Smirl | 2526c15 | 2009-01-09 15:49:06 -0700 | [diff] [blame] | 70 | static int of_dev_node_match(struct device *dev, void *data) |
| 71 | { |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame^] | 72 | return dev->of_node == data; |
Jon Smirl | 2526c15 | 2009-01-09 15:49:06 -0700 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | /* must call put_device() when done with returned i2c_client device */ |
| 76 | struct i2c_client *of_find_i2c_device_by_node(struct device_node *node) |
| 77 | { |
| 78 | struct device *dev; |
| 79 | |
| 80 | dev = bus_find_device(&i2c_bus_type, NULL, node, |
| 81 | of_dev_node_match); |
| 82 | if (!dev) |
| 83 | return NULL; |
| 84 | |
| 85 | return to_i2c_client(dev); |
| 86 | } |
| 87 | EXPORT_SYMBOL(of_find_i2c_device_by_node); |
| 88 | |
Adrian Bunk | 138decf | 2008-04-23 19:51:34 +1000 | [diff] [blame] | 89 | MODULE_LICENSE("GPL"); |