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 } 102