linux-imx

/*

 *  ISA Plug & Play support

 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>

 *

 *   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.

 *

 *   You should have received a copy of the GNU General Public License

 *   along with this program; if not, write to the Free Software

 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

​

#include <linux/module.h>

#include <linux/isapnp.h>

#include <linux/proc_fs.h>

#include <linux/init.h>

#include <linux/uaccess.h>

​

extern struct pnp_protocol isapnp_protocol;

​

static struct proc_dir_entry *isapnp_proc_bus_dir = NULL;

​

static loff_t isapnp_proc_bus_lseek(struct file *file, loff_t off, int whence)

{

    return fixed_size_llseek(file, off, whence, 256);

}

​

static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf,

                    size_t nbytes, loff_t * ppos)

{

    struct pnp_dev *dev = PDE_DATA(file_inode(file));

    int pos = *ppos;

    int cnt, size = 256;

​

    if (pos >= size)

        return 0;

    if (nbytes >= size)

        nbytes = size;

    if (pos + nbytes > size)

        nbytes = size - pos;

    cnt = nbytes;

​

    if (!access_ok(buf, cnt))

        return -EINVAL;

​

    isapnp_cfg_begin(dev->card->number, dev->number);

    for (; pos < 256 && cnt > 0; pos++, buf++, cnt--) {

        unsigned char val;

        val = isapnp_read_byte(pos);

        __put_user(val, buf);

    }

    isapnp_cfg_end();

​

    *ppos = pos;

    return nbytes;

}