blob: 958c11bedd0d66da73e35de1d7d02f3760aaf91f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#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
29extern struct pnp_protocol isapnp_protocol;
30
31static struct proc_dir_entry *isapnp_proc_bus_dir = NULL;
32
33static 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
57static 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_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
88static struct file_operations isapnp_proc_bus_file_operations =
89{
90 .llseek = isapnp_proc_bus_lseek,
91 .read = isapnp_proc_bus_read,
92};
93
94static 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
118static 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
131static 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
144int __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
155int __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 */