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/smp_lock.h> 25 #include <asm/uaccess.h> 26 27 extern struct pnp_protocol isapnp_protocol; 28 29 static struct proc_dir_entry *isapnp_proc_bus_dir = NULL; 30 31 static loff_t isapnp_proc_bus_lseek(struct file *file, loff_t off, int whence) 32 { 33 loff_t new = -1; 34 35 lock_kernel(); 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 unlock_kernel(); 49 return -EINVAL; 50 } 51 unlock_kernel(); 52 return (file->f_pos = 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->f_path.dentry->d_inode; 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 .llseek = isapnp_proc_bus_lseek, 89 .read = isapnp_proc_bus_read, 90 }; 91 92 static int isapnp_proc_attach_device(struct pnp_dev *dev) 93 { 94 struct pnp_card *bus = dev->card; 95 struct proc_dir_entry *de, *e; 96 char name[16]; 97 98 if (!(de = bus->procdir)) { 99 sprintf(name, "%02x", bus->number); 100 de = bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir); 101 if (!de) 102 return -ENOMEM; 103 } 104 sprintf(name, "%02x", dev->number); 105 e = dev->procent = create_proc_entry(name, S_IFREG | S_IRUGO, de); 106 if (!e) 107 return -ENOMEM; 108 e->proc_fops = &isapnp_proc_bus_file_operations; 109 e->owner = THIS_MODULE; 110 e->data = dev; 111 e->size = 256; 112 return 0; 113 } 114 115 int __init isapnp_proc_init(void) 116 { 117 struct pnp_dev *dev; 118 119 isapnp_proc_bus_dir = proc_mkdir("isapnp", proc_bus); 120 protocol_for_each_dev(&isapnp_protocol, dev) { 121 isapnp_proc_attach_device(dev); 122 } 123 return 0; 124 } 125