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 <linux/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        return fixed_size_llseek(file, off, whence, 256);
  33}
  34
  35static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf,
  36                                    size_t nbytes, loff_t * ppos)
  37{
  38        struct pnp_dev *dev = PDE_DATA(file_inode(file));
  39        int pos = *ppos;
  40        int cnt, size = 256;
  41
  42        if (pos >= size)
  43                return 0;
  44        if (nbytes >= size)
  45                nbytes = size;
  46        if (pos + nbytes > size)
  47                nbytes = size - pos;
  48        cnt = nbytes;
  49
  50        if (!access_ok(VERIFY_WRITE, buf, cnt))
  51                return -EINVAL;
  52
  53        isapnp_cfg_begin(dev->card->number, dev->number);
  54        for (; pos < 256 && cnt > 0; pos++, buf++, cnt--) {
  55                unsigned char val;
  56                val = isapnp_read_byte(pos);
  57                __put_user(val, buf);
  58        }
  59        isapnp_cfg_end();
  60
  61        *ppos = pos;
  62        return nbytes;
  63}
  64
  65static const struct file_operations isapnp_proc_bus_file_operations = {
  66        .owner  = THIS_MODULE,
  67        .llseek = isapnp_proc_bus_lseek,
  68        .read = isapnp_proc_bus_read,
  69};
  70
  71static int isapnp_proc_attach_device(struct pnp_dev *dev)
  72{
  73        struct pnp_card *bus = dev->card;
  74        struct proc_dir_entry *de, *e;
  75        char name[16];
  76
  77        if (!(de = bus->procdir)) {
  78                sprintf(name, "%02x", bus->number);
  79                de = bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir);
  80                if (!de)
  81                        return -ENOMEM;
  82        }
  83        sprintf(name, "%02x", dev->number);
  84        e = dev->procent = proc_create_data(name, S_IFREG | S_IRUGO, de,
  85                        &isapnp_proc_bus_file_operations, dev);
  86        if (!e)
  87                return -ENOMEM;
  88        proc_set_size(e, 256);
  89        return 0;
  90}
  91
  92int __init isapnp_proc_init(void)
  93{
  94        struct pnp_dev *dev;
  95
  96        isapnp_proc_bus_dir = proc_mkdir("bus/isapnp", NULL);
  97        protocol_for_each_dev(&isapnp_protocol, dev) {
  98                isapnp_proc_attach_device(dev);
  99        }
 100        return 0;
 101}
 102