1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * compat.c - A series of functions to make it easier to convert drivers that use |
4 | * the old isapnp APIs. If possible use the new APIs instead. |
5 | * |
6 | * Copyright 2002 Adam Belay <ambx1@neo.rr.com> |
7 | */ |
8 | |
9 | #include <linux/module.h> |
10 | #include <linux/isapnp.h> |
11 | #include <linux/string.h> |
12 | |
13 | static void pnp_convert_id(char *buf, unsigned short vendor, |
14 | unsigned short device) |
15 | { |
16 | sprintf(buf, fmt: "%c%c%c%x%x%x%x" , |
17 | 'A' + ((vendor >> 2) & 0x3f) - 1, |
18 | 'A' + (((vendor & 3) << 3) | ((vendor >> 13) & 7)) - 1, |
19 | 'A' + ((vendor >> 8) & 0x1f) - 1, |
20 | (device >> 4) & 0x0f, device & 0x0f, |
21 | (device >> 12) & 0x0f, (device >> 8) & 0x0f); |
22 | } |
23 | |
24 | struct pnp_dev *pnp_find_dev(struct pnp_card *card, unsigned short vendor, |
25 | unsigned short function, struct pnp_dev *from) |
26 | { |
27 | char id[8]; |
28 | char any[8]; |
29 | |
30 | pnp_convert_id(buf: id, vendor, device: function); |
31 | pnp_convert_id(buf: any, ISAPNP_ANY_ID, ISAPNP_ANY_ID); |
32 | if (card == NULL) { /* look for a logical device from all cards */ |
33 | struct list_head *list; |
34 | |
35 | list = pnp_global.next; |
36 | if (from) |
37 | list = from->global_list.next; |
38 | |
39 | while (list != &pnp_global) { |
40 | struct pnp_dev *dev = global_to_pnp_dev(list); |
41 | |
42 | if (compare_pnp_id(pos: dev->id, id) || |
43 | (memcmp(p: id, q: any, size: 7) == 0)) |
44 | return dev; |
45 | list = list->next; |
46 | } |
47 | } else { |
48 | struct list_head *list; |
49 | |
50 | list = card->devices.next; |
51 | if (from) { |
52 | list = from->card_list.next; |
53 | if (from->card != card) /* something is wrong */ |
54 | return NULL; |
55 | } |
56 | while (list != &card->devices) { |
57 | struct pnp_dev *dev = card_to_pnp_dev(list); |
58 | |
59 | if (compare_pnp_id(pos: dev->id, id)) |
60 | return dev; |
61 | list = list->next; |
62 | } |
63 | } |
64 | return NULL; |
65 | } |
66 | EXPORT_SYMBOL(pnp_find_dev); |
67 | |