LXR linux/drivers/pnp/isapnp/proc.c

   1/*
   2 *  ISA Plug & Play support
   3 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4 *
   5 *   This program is free software; you can redistribute it and/or modify
   6 *   it under the terms of the GNU General Public License as published by
   7 *   the Free Software Foundation; either version 2 of the License, or
   8 *   (at your option) any later version.
   9 *
  10 *   This program is distributed in the hope that it will be useful,
  11 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 *   GNU General Public License for more details.
  14 *
  15 *   You should have received a copy of the GNU General Public License
  16 *   along with this program; if not, write to the Free Software
  17 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18 */
  19
  20#include <linux/module.h>
  21#include <linux/isapnp.h>
  22#include <linux/proc_fs.h>
  23#include <linux/init.h>
  24#include <asm/uaccess.h>
  25
  26extern struct pnp_protocol isapnp_protocol;
  27
  28static struct proc_dir_entry *isapnp_proc_bus_dir = NULL;
  29
  30static loff_t isapnp_proc_bus_lseek(struct file *file, loff_t off, int whence)
  31{
  32        loff_t new = -1;
  33        struct inode *inode = file_inode(file);
  34
  35        mutex_lock(&inode->i_mutex);
  36        switch (whence) {
  37        case 0:
  38                new = off;
  39                break;
  40        case 1:
  41                new = file->f_pos + off;
  42                break;
  43        case 2:
  44                new = 256 + off;
  45                break;
  46        }
  47        if (new < 0 || new > 256)
  48                new = -EINVAL;
  49        else
  50                file->f_pos = new;
  51        mutex_unlock(&inode->i_mutex);
  52        return new;
  53}
  54
  55static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf,
  56                                    size_t nbytes, loff_t * ppos)
  57{
  58        struct pnp_dev *dev = PDE_DATA(file_inode(file));
  59        int pos = *ppos;
  60        int cnt, size = 256;
  61
  62        if (pos >= size)
  63                return 0;
  64        if (nbytes >= size)
  65                nbytes = size;
  66        if (pos + nbytes > size)
  67                nbytes = size - pos;
  68        cnt = nbytes;
  69
  70        if (!access_ok(VERIFY_WRITE, buf, cnt))
  71                return -EINVAL;
  72
  73        isapnp_cfg_begin(dev->card->number, dev->number);
  74        for (; pos < 256 && cnt > 0; pos++, buf++, cnt--) {
  75                unsigned char val;
  76                val = isapnp_read_byte(pos);
  77                __put_user(val, buf);
  78        }
  79        isapnp_cfg_end();
  80
  81        *ppos = pos;
  82        return nbytes;
  83}
  84
  85static const struct file_operations isapnp_proc_bus_file_operations = {
  86        .owner  = THIS_MODULE,
  87        .llseek = isapnp_proc_bus_lseek,
  88        .read = isapnp_proc_bus_read,
  89};
  90
  91static int isapnp_proc_attach_device(struct pnp_dev *dev)
  92{
  93        struct pnp_card *bus = dev->card;
  94        struct proc_dir_entry *de, *e;
  95        char name[16];
  96
  97        if (!(de = bus->procdir)) {
  98                sprintf(name, "%02x", bus->number);
  99                de = bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir);
 100                if (!de)
 101                        return -ENOMEM;
 102        }
 103        sprintf(name, "%02x", dev->number);
 104        e = dev->procent = proc_create_data(name, S_IFREG | S_IRUGO, de,
 105                        &isapnp_proc_bus_file_operations, dev);
 106        if (!e)
 107                return -ENOMEM;
 108        proc_set_size(e, 256);
 109        return 0;
 110}
 111
 112int __init isapnp_proc_init(void)
 113{
 114        struct pnp_dev *dev;
 115
 116        isapnp_proc_bus_dir = proc_mkdir("bus/isapnp", NULL);
 117        protocol_for_each_dev(&isapnp_protocol, dev) {
 118                isapnp_proc_attach_device(dev);
 119        }
 120        return 0;
 121}
 122