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1da177e4 LT |
1 | /* |
2 | * ISA Plug & Play support | |
3 | * Copyright (c) by Jaroslav Kysela <perex@suse.cz> | |
4 | * | |
1da177e4 LT |
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. | |
1da177e4 LT |
18 | */ |
19 | ||
1da177e4 LT |
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 | ||
9dd78466 BH |
55 | static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf, |
56 | size_t nbytes, loff_t * ppos) | |
1da177e4 | 57 | { |
b23463b9 | 58 | struct inode *ino = file->f_path.dentry->d_inode; |
1da177e4 LT |
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); | |
9dd78466 | 76 | for (; pos < 256 && cnt > 0; pos++, buf++, cnt--) { |
1da177e4 LT |
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 | ||
9dd78466 BH |
87 | static const struct file_operations isapnp_proc_bus_file_operations = { |
88 | .llseek = isapnp_proc_bus_lseek, | |
89 | .read = isapnp_proc_bus_read, | |
1da177e4 LT |
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 | ||
1da177e4 LT |
115 | int __init isapnp_proc_init(void) |
116 | { | |
117 | struct pnp_dev *dev; | |
07d4e9af | 118 | |
1da177e4 | 119 | isapnp_proc_bus_dir = proc_mkdir("isapnp", proc_bus); |
9dd78466 | 120 | protocol_for_each_dev(&isapnp_protocol, dev) { |
1da177e4 LT |
121 | isapnp_proc_attach_device(dev); |
122 | } | |
123 | return 0; | |
124 | } |