[net-next-2.6.git] / drivers / of / of_i2c.c

/*
 * OF helpers for the I2C API
 *
 * Copyright (c) 2008 Jochen Friedrich <jochen@scram.de>
 *
 * Based on a previous patch from Jon Smirl <jonsmirl@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/of_i2c.h>
#include <linux/of_irq.h>
#include <linux/module.h>

void of_i2c_register_devices(struct i2c_adapter *adap)
{
	void *result;
	struct device_node *node;

	/* Only register child devices if the adapter has a node pointer set */
	if (!adap->dev.of_node)
		return;

	dev_dbg(&adap->dev, "of_i2c: walking child nodes\n");

	for_each_child_of_node(adap->dev.of_node, node) {
		struct i2c_board_info info = {};
		struct dev_archdata dev_ad = {};
		const __be32 *addr;
		int len;

		dev_dbg(&adap->dev, "of_i2c: register %s\n", node->full_name);

		if (of_modalias_node(node, info.type, sizeof(info.type)) < 0) {
			dev_err(&adap->dev, "of_i2c: modalias failure on %s\n",
				node->full_name);
			continue;
		}

		addr = of_get_property(node, "reg", &len);
		if (!addr || (len < sizeof(int))) {
			dev_err(&adap->dev, "of_i2c: invalid reg on %s\n",
				node->full_name);
			continue;
		}

		info.addr = be32_to_cpup(addr);
		if (info.addr > (1 << 10) - 1) {
			dev_err(&adap->dev, "of_i2c: invalid addr=%x on %s\n",
				info.addr, node->full_name);
			continue;
		}

		info.irq = irq_of_parse_and_map(node, 0);
		info.of_node = of_node_get(node);
		info.archdata = &dev_ad;

		request_module("%s", info.type);

		result = i2c_new_device(adap, &info);
		if (result == NULL) {
			dev_err(&adap->dev, "of_i2c: Failure registering %s\n",
			        node->full_name);
			of_node_put(node);
			irq_dispose_mapping(info.irq);
			continue;
		}
	}
}
EXPORT_SYMBOL(of_i2c_register_devices);

static int of_dev_node_match(struct device *dev, void *data)
{
        return dev->of_node == data;
}

/* must call put_device() when done with returned i2c_client device */
struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
{
	struct device *dev;

	dev = bus_find_device(&i2c_bus_type, NULL, node,
					 of_dev_node_match);
	if (!dev)
		return NULL;

	return to_i2c_client(dev);
}
EXPORT_SYMBOL(of_find_i2c_device_by_node);

MODULE_LICENSE("GPL");
Commit	Line	Data
612212a3 JF	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>
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;
612212a3 JF	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);
9fd04992 GL	61	info.of_node = of_node_get(node);
e6a437eb AV	62	info.archdata = &dev_ad;
e6a437eb AV	63
0721357d	64	request_module("%s", 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)
2526c151 JS	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");