drivers/pnp/isapnp/compat.c

   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);