[deliverable/linux.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/of.h>
#include <linux/of_i2c.h>
#include <linux/module.h>

void of_register_i2c_devices(struct i2c_adapter *adap,
			     struct device_node *adap_node)
{
	void *result;
	struct device_node *node;

	for_each_child_of_node(adap_node, node) {
		struct i2c_board_info info = {};
		const u32 *addr;
		int len;

		if (of_modalias_node(node, info.type, sizeof(info.type)) < 0)
			continue;

		addr = of_get_property(node, "reg", &len);
		if (!addr || len < sizeof(int) || *addr > (1 << 10) - 1) {
			printk(KERN_ERR
			       "of-i2c: invalid i2c device entry\n");
			continue;
		}

		info.irq = irq_of_parse_and_map(node, 0);

		info.addr = *addr;

		request_module(info.type);

		result = i2c_new_device(adap, &info);
		if (result == NULL) {
			printk(KERN_ERR
			       "of-i2c: Failed to load driver for %s\n",
			       info.type);
			irq_dispose_mapping(info.irq);
			continue;
		}
	}
}
EXPORT_SYMBOL(of_register_i2c_devices);

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>
	15	#include <linux/of.h>
f40987b6	16	#include <linux/of_i2c.h>
138decf8	17	#include <linux/module.h>
612212a3	18
612212a3 JF	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 = {};
	27	const u32 *addr;
	28	int len;
	29
3f07af49 GL	30	if (of_modalias_node(node, info.type, sizeof(info.type)) < 0)
	31	continue;
	32
612212a3 JF	33	addr = of_get_property(node, "reg", &len);
	34	if (!addr \|\| len < sizeof(int) \|\| *addr > (1 << 10) - 1) {
	35	printk(KERN_ERR
	36	"of-i2c: invalid i2c device entry\n");
	37	continue;
	38	}
	39
	40	info.irq = irq_of_parse_and_map(node, 0);
612212a3	41
612212a3 JF	42	info.addr = *addr;
	43
	44	request_module(info.type);
	45
	46	result = i2c_new_device(adap, &info);
	47	if (result == NULL) {
	48	printk(KERN_ERR
	49	"of-i2c: Failed to load driver for %s\n",
	50	info.type);
	51	irq_dispose_mapping(info.irq);
	52	continue;
	53	}
	54	}
	55	}
	56	EXPORT_SYMBOL(of_register_i2c_devices);
138decf8 AB	57
138decf8 AB	58	MODULE_LICENSE("GPL");