| 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, "%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(id, vendor, function); |
| 31 | pnp_convert_id(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(dev->id, id) || |
| 43 | (memcmp(id, any, 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(dev->id, id)) |
| 60 | return dev; |
| 61 | list = list->next; |
| 62 | } |
| 63 | } |
| 64 | return NULL; |
| 65 | } |
| 66 | EXPORT_SYMBOL(pnp_find_dev); |