drivers/pnp/isapnp/proc.c

   1 /*
   2  *  ISA Plug & Play support
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/isapnp.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/init.h>
  26 #include <linux/smp_lock.h>
  27 #include <asm/uaccess.h>
  28
  29 extern struct pnp_protocol isapnp_protocol;
  30
  31 static struct proc_dir_entry *isapnp_proc_bus_dir = NULL;
  32
  33 static loff_t isapnp_proc_bus_lseek(struct file *file, loff_t off, int whence)
  34 {
  35         loff_t new = -1;
  36
  37         lock_kernel();
  38         switch (whence) {
  39         case 0:
  40                 new = off;
  41                 break;
  42         case 1:
  43                 new = file->f_pos + off;
  44                 break;
  45         case 2:
  46                 new = 256 + off;
  47                 break;
  48         }
  49         if (new < 0 || new > 256) {
  50                 unlock_kernel();
  51                 return -EINVAL;
  52         }
  53         unlock_kernel();
  54         return (file->f_pos = new);
  55 }
  56
  57 static ssize_t isapnp_proc_bus_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
  58 {
  59         struct inode *ino = file->f_path.dentry->d_inode;
  60         struct proc_dir_entry *dp = PDE(ino);
  61         struct pnp_dev *dev = dp->data;
  62         int pos = *ppos;
  63         int cnt, size = 256;
  64
  65         if (pos >= size)
  66                 return 0;
  67         if (nbytes >= size)
  68                 nbytes = size;
  69         if (pos + nbytes > size)
  70                 nbytes = size - pos;
  71         cnt = nbytes;
  72
  73         if (!access_ok(VERIFY_WRITE, buf, cnt))
  74                 return -EINVAL;
  75
  76         isapnp_cfg_begin(dev->card->number, dev->number);
  77         for ( ; pos < 256 && cnt > 0; pos++, buf++, cnt--) {
  78                 unsigned char val;
  79                 val = isapnp_read_byte(pos);
  80                 __put_user(val, buf);
  81         }
  82         isapnp_cfg_end();
  83
  84         *ppos = pos;
  85         return nbytes;
  86 }
  87
  88 static struct file_operations isapnp_proc_bus_file_operations =
  89 {
  90         .llseek         = isapnp_proc_bus_lseek,
  91         .read           = isapnp_proc_bus_read,
  92 };
  93
  94 static int isapnp_proc_attach_device(struct pnp_dev *dev)
  95 {
  96         struct pnp_card *bus = dev->card;
  97         struct proc_dir_entry *de, *e;
  98         char name[16];
  99
 100         if (!(de = bus->procdir)) {
 101                 sprintf(name, "%02x", bus->number);
 102                 de = bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir);
 103                 if (!de)
 104                         return -ENOMEM;
 105         }
 106         sprintf(name, "%02x", dev->number);
 107         e = dev->procent = create_proc_entry(name, S_IFREG | S_IRUGO, de);
 108         if (!e)
 109                 return -ENOMEM;
 110         e->proc_fops = &isapnp_proc_bus_file_operations;
 111         e->owner = THIS_MODULE;
 112         e->data = dev;
 113         e->size = 256;
 114         return 0;
 115 }
 116
 117 #ifdef MODULE
 118 static int __exit isapnp_proc_detach_device(struct pnp_dev *dev)
 119 {
 120         struct pnp_card *bus = dev->card;
 121         struct proc_dir_entry *de;
 122         char name[16];
 123
 124         if (!(de = bus->procdir))
 125                 return -EINVAL;
 126         sprintf(name, "%02x", dev->number);
 127         remove_proc_entry(name, de);
 128         return 0;
 129 }
 130
 131 static int __exit isapnp_proc_detach_bus(struct pnp_card *bus)
 132 {
 133         struct proc_dir_entry *de;
 134         char name[16];
 135
 136         if (!(de = bus->procdir))
 137                 return -EINVAL;
 138         sprintf(name, "%02x", bus->number);
 139         remove_proc_entry(name, isapnp_proc_bus_dir);
 140         return 0;
 141 }
 142 #endif /* MODULE */
 143
 144 int __init isapnp_proc_init(void)
 145 {
 146         struct pnp_dev *dev;
 147         isapnp_proc_bus_dir = proc_mkdir("isapnp", proc_bus);
 148         protocol_for_each_dev(&isapnp_protocol,dev) {
 149                 isapnp_proc_attach_device(dev);
 150         }
 151         return 0;
 152 }
 153
 154 #ifdef MODULE
 155 int __exit isapnp_proc_done(void)
 156 {
 157         struct pnp_dev *dev;
 158         struct pnp_bus *card;
 159
 160         isapnp_for_each_dev(dev) {
 161                 isapnp_proc_detach_device(dev);
 162         }
 163         isapnp_for_each_card(card) {
 164                 isapnp_proc_detach_bus(card);
 165         }
 166         if (isapnp_proc_bus_dir)
 167                 remove_proc_entry("isapnp", proc_bus);
 168         return 0;
 169 }
 170 #endif /* MODULE */