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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [i2c/] [i2c-boardinfo.c] - Blame information for rev 62

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1 62 marcus.erl
/*
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 * i2c-boardinfo.h - collect pre-declarations of I2C devices
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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 */
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#include <linux/kernel.h>
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#include <linux/i2c.h>
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#include "i2c-core.h"
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/* These symbols are exported ONLY FOR the i2c core.
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 * No other users will be supported.
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 */
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DEFINE_MUTEX(__i2c_board_lock);
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EXPORT_SYMBOL_GPL(__i2c_board_lock);
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LIST_HEAD(__i2c_board_list);
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EXPORT_SYMBOL_GPL(__i2c_board_list);
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int __i2c_first_dynamic_bus_num;
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EXPORT_SYMBOL_GPL(__i2c_first_dynamic_bus_num);
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/**
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 * i2c_register_board_info - statically declare I2C devices
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 * @busnum: identifies the bus to which these devices belong
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 * @info: vector of i2c device descriptors
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 * @len: how many descriptors in the vector; may be zero to reserve
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 *      the specified bus number.
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 *
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 * Systems using the Linux I2C driver stack can declare tables of board info
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 * while they initialize.  This should be done in board-specific init code
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 * near arch_initcall() time, or equivalent, before any I2C adapter driver is
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 * registered.  For example, mainboard init code could define several devices,
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 * as could the init code for each daughtercard in a board stack.
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 *
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 * The I2C devices will be created later, after the adapter for the relevant
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 * bus has been registered.  After that moment, standard driver model tools
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 * are used to bind "new style" I2C drivers to the devices.  The bus number
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 * for any device declared using this routine is not available for dynamic
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 * allocation.
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 *
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 * The board info passed can safely be __initdata, but be careful of embedded
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 * pointers (for platform_data, functions, etc) since that won't be copied.
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 */
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int __init
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i2c_register_board_info(int busnum,
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        struct i2c_board_info const *info, unsigned len)
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{
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        int status;
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        mutex_lock(&__i2c_board_lock);
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        /* dynamic bus numbers will be assigned after the last static one */
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        if (busnum >= __i2c_first_dynamic_bus_num)
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                __i2c_first_dynamic_bus_num = busnum + 1;
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        for (status = 0; len; len--, info++) {
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                struct i2c_devinfo      *devinfo;
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                devinfo = kzalloc(sizeof(*devinfo), GFP_KERNEL);
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                if (!devinfo) {
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                        pr_debug("i2c-core: can't register boardinfo!\n");
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                        status = -ENOMEM;
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                        break;
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                }
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                devinfo->busnum = busnum;
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                devinfo->board_info = *info;
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                list_add_tail(&devinfo->list, &__i2c_board_list);
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        }
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        mutex_unlock(&__i2c_board_lock);
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        return status;
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}

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