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
  26 extern struct pnp_protocol isapnp_protocol;
  27
  28 static struct proc_dir_entry *isapnp_proc_bus_dir = NULL;
  29
  30 static 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
  35 static 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
  65 static 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
  71 static 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
  92 int __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 }