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1da177e4 LT |
1 | /* |
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 | ||
1da177e4 LT |
22 | #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 | ||
29 | extern struct pnp_protocol isapnp_protocol; | |
30 | ||
31 | static struct proc_dir_entry *isapnp_proc_bus_dir = NULL; | |
32 | ||
33 | static 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 | ||
57 | static 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 | ||
88 | static struct file_operations isapnp_proc_bus_file_operations = | |
89 | { | |
90 | .llseek = isapnp_proc_bus_lseek, | |
91 | .read = isapnp_proc_bus_read, | |
92 | }; | |
93 | ||
94 | static 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 | |
118 | static 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 | ||
131 | static 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 | ||
144 | int __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 | |
155 | int __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 */ |