linux-imx

/*

 * i2c-boardinfo.c - collect pre-declarations of I2C devices

 *

 * 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.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

​

#include <linux/export.h>

#include <linux/i2c.h>

#include <linux/kernel.h>

#include <linux/property.h>

#include <linux/rwsem.h>

#include <linux/slab.h>

​

#include "i2c-core.h"

​

​

/* These symbols are exported ONLY FOR the i2c core.

 * No other users will be supported.

 */

DECLARE_RWSEM(__i2c_board_lock);

EXPORT_SYMBOL_GPL(__i2c_board_lock);

​

LIST_HEAD(__i2c_board_list);

EXPORT_SYMBOL_GPL(__i2c_board_list);

​

int __i2c_first_dynamic_bus_num;

EXPORT_SYMBOL_GPL(__i2c_first_dynamic_bus_num);

​

​

/**

 * i2c_register_board_info - statically declare I2C devices

 * @busnum: identifies the bus to which these devices belong

 * @info: vector of i2c device descriptors

 * @len: how many descriptors in the vector; may be zero to reserve

 *  the specified bus number.

 *

 * Systems using the Linux I2C driver stack can declare tables of board info

 * while they initialize.  This should be done in board-specific init code

 * near arch_initcall() time, or equivalent, before any I2C adapter driver is

 * registered.  For example, mainboard init code could define several devices,

 * as could the init code for each daughtercard in a board stack.

 *

 * The I2C devices will be created later, after the adapter for the relevant

 * bus has been registered.  After that moment, standard driver model tools

 * are used to bind "new style" I2C drivers to the devices.  The bus number

 * for any device declared using this routine is not available for dynamic

 * allocation.

 *

 * The board info passed can safely be __initdata, but be careful of embedded

 * pointers (for platform_data, functions, etc) since that won't be copied.

 * Device properties are deep-copied though.

 */

int i2c_register_board_info(int busnum, struct i2c_board_info const *info, unsigned len)

{

    int status;