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74ba9207 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * ISA Plug & Play support | |
c1017a4c | 4 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
5 | */ |
6 | ||
1da177e4 LT |
7 | #include <linux/module.h> |
8 | #include <linux/isapnp.h> | |
9 | #include <linux/proc_fs.h> | |
10 | #include <linux/init.h> | |
13d4ea09 | 11 | #include <linux/uaccess.h> |
1da177e4 LT |
12 | |
13 | extern struct pnp_protocol isapnp_protocol; | |
14 | ||
15 | static struct proc_dir_entry *isapnp_proc_bus_dir = NULL; | |
16 | ||
17 | static loff_t isapnp_proc_bus_lseek(struct file *file, loff_t off, int whence) | |
18 | { | |
c09ed2a6 | 19 | return fixed_size_llseek(file, off, whence, 256); |
1da177e4 LT |
20 | } |
21 | ||
9dd78466 BH |
22 | static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf, |
23 | size_t nbytes, loff_t * ppos) | |
1da177e4 | 24 | { |
d9dda78b | 25 | struct pnp_dev *dev = PDE_DATA(file_inode(file)); |
1da177e4 LT |
26 | int pos = *ppos; |
27 | int cnt, size = 256; | |
28 | ||
29 | if (pos >= size) | |
30 | return 0; | |
31 | if (nbytes >= size) | |
32 | nbytes = size; | |
33 | if (pos + nbytes > size) | |
34 | nbytes = size - pos; | |
35 | cnt = nbytes; | |
36 | ||
96d4f267 | 37 | if (!access_ok(buf, cnt)) |
1da177e4 LT |
38 | return -EINVAL; |
39 | ||
40 | isapnp_cfg_begin(dev->card->number, dev->number); | |
9dd78466 | 41 | for (; pos < 256 && cnt > 0; pos++, buf++, cnt--) { |
1da177e4 LT |
42 | unsigned char val; |
43 | val = isapnp_read_byte(pos); | |
44 | __put_user(val, buf); | |
45 | } | |
46 | isapnp_cfg_end(); | |
47 | ||
48 | *ppos = pos; | |
49 | return nbytes; | |
50 | } | |
51 | ||
9dd78466 | 52 | static const struct file_operations isapnp_proc_bus_file_operations = { |
c7705f34 | 53 | .owner = THIS_MODULE, |
9dd78466 BH |
54 | .llseek = isapnp_proc_bus_lseek, |
55 | .read = isapnp_proc_bus_read, | |
1da177e4 LT |
56 | }; |
57 | ||
58 | static int isapnp_proc_attach_device(struct pnp_dev *dev) | |
59 | { | |
60 | struct pnp_card *bus = dev->card; | |
61 | struct proc_dir_entry *de, *e; | |
62 | char name[16]; | |
63 | ||
64 | if (!(de = bus->procdir)) { | |
65 | sprintf(name, "%02x", bus->number); | |
66 | de = bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir); | |
67 | if (!de) | |
68 | return -ENOMEM; | |
69 | } | |
70 | sprintf(name, "%02x", dev->number); | |
c7705f34 DL |
71 | e = dev->procent = proc_create_data(name, S_IFREG | S_IRUGO, de, |
72 | &isapnp_proc_bus_file_operations, dev); | |
1da177e4 LT |
73 | if (!e) |
74 | return -ENOMEM; | |
271a15ea | 75 | proc_set_size(e, 256); |
1da177e4 LT |
76 | return 0; |
77 | } | |
78 | ||
1da177e4 LT |
79 | int __init isapnp_proc_init(void) |
80 | { | |
81 | struct pnp_dev *dev; | |
07d4e9af | 82 | |
9c37066d | 83 | isapnp_proc_bus_dir = proc_mkdir("bus/isapnp", NULL); |
9dd78466 | 84 | protocol_for_each_dev(&isapnp_protocol, dev) { |
1da177e4 LT |
85 | isapnp_proc_attach_device(dev); |
86 | } | |
87 | return 0; | |
88 | } |