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 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 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 55 static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf, 56 size_t nbytes, loff_t * ppos) 57 { 58 struct inode *ino = file_inode(file); 59 struct proc_dir_entry *dp = PDE(ino); 60 struct pnp_dev *dev = dp->data; 61 int pos = *ppos; 62 int cnt, size = 256; 63 64 if (pos >= size) 65 return 0; 66 if (nbytes >= size) 67 nbytes = size; 68 if (pos + nbytes > size) 69 nbytes = size - pos; 70 cnt = nbytes; 71 72 if (!access_ok(VERIFY_WRITE, buf, cnt)) 73 return -EINVAL; 74 75 isapnp_cfg_begin(dev->card->number, dev->number); 76 for (; pos < 256 && cnt > 0; pos++, buf++, cnt--) { 77 unsigned char val; 78 val = isapnp_read_byte(pos); 79 __put_user(val, buf); 80 } 81 isapnp_cfg_end(); 82 83 *ppos = pos; 84 return nbytes; 85 } 86 87 static const struct file_operations isapnp_proc_bus_file_operations = { 88 .owner = THIS_MODULE, 89 .llseek = isapnp_proc_bus_lseek, 90 .read = isapnp_proc_bus_read, 91 }; 92 93 static int isapnp_proc_attach_device(struct pnp_dev *dev) 94 { 95 struct pnp_card *bus = dev->card; 96 struct proc_dir_entry *de, *e; 97 char name[16]; 98 99 if (!(de = bus->procdir)) { 100 sprintf(name, "%02x", bus->number); 101 de = bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir); 102 if (!de) 103 return -ENOMEM; 104 } 105 sprintf(name, "%02x", dev->number); 106 e = dev->procent = proc_create_data(name, S_IFREG | S_IRUGO, de, 107 &isapnp_proc_bus_file_operations, dev); 108 if (!e) 109 return -ENOMEM; 110 e->size = 256; 111 return 0; 112 } 113 114 int __init isapnp_proc_init(void) 115 { 116 struct pnp_dev *dev; 117 118 isapnp_proc_bus_dir = proc_mkdir("bus/isapnp", NULL); 119 protocol_for_each_dev(&isapnp_protocol, dev) { 120 isapnp_proc_attach_device(dev); 121 } 122 return 0; 123 } 124