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_card *pnp_find_card(unsigned short vendor, unsigned short device,
  25                                struct pnp_card *from)
  26 {
  27         char id[8];
  28         char any[8];
  29         struct list_head *list;
  30
  31         pnp_convert_id(id, vendor, device);
  32         pnp_convert_id(any, ISAPNP_ANY_ID, ISAPNP_ANY_ID);
  33
  34         list = from ? from->global_list.next : pnp_cards.next;
  35
  36         while (list != &pnp_cards) {
  37                 struct pnp_card *card = global_to_pnp_card(list);
  38
  39                 if (compare_pnp_id(card->id, id) || (memcmp(id, any, 7) == 0))
  40                         return card;
  41                 list = list->next;
  42         }
  43         return NULL;
  44 }
  45
  46 struct pnp_dev *pnp_find_dev(struct pnp_card *card, unsigned short vendor,
  47                              unsigned short function, struct pnp_dev *from)
  48 {
  49         char id[8];
  50         char any[8];
  51
  52         pnp_convert_id(id, vendor, function);
  53         pnp_convert_id(any, ISAPNP_ANY_ID, ISAPNP_ANY_ID);
  54         if (card == NULL) {     /* look for a logical device from all cards */
  55                 struct list_head *list;
  56
  57                 list = pnp_global.next;
  58                 if (from)
  59                         list = from->global_list.next;
  60
  61                 while (list != &pnp_global) {
  62                         struct pnp_dev *dev = global_to_pnp_dev(list);
  63
  64                         if (compare_pnp_id(dev->id, id) ||
  65                             (memcmp(id, any, 7) == 0))
  66                                 return dev;
  67                         list = list->next;
  68                 }
  69         } else {
  70                 struct list_head *list;
  71
  72                 list = card->devices.next;
  73                 if (from) {
  74                         list = from->card_list.next;
  75                         if (from->card != card) /* something is wrong */
  76                                 return NULL;
  77                 }
  78                 while (list != &card->devices) {
  79                         struct pnp_dev *dev = card_to_pnp_dev(list);
  80
  81                         if (compare_pnp_id(dev->id, id))
  82                                 return dev;
  83                         list = list->next;
  84                 }
  85         }
  86         return NULL;
  87 }
  88
  89 EXPORT_SYMBOL(pnp_find_card);
  90 EXPORT_SYMBOL(pnp_find_dev);