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 pnp_convert_id(char * buf,unsigned short vendor,unsigned short device)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 pnp_find_dev(struct pnp_card * card,unsigned short vendor,unsigned short function,struct pnp_dev * from)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 67 EXPORT_SYMBOL(pnp_find_dev); 68