LXR linux/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
  13static 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
  24struct 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}
  66EXPORT_SYMBOL(pnp_find_dev);
  67