git.rot13.org Git - librfid/blob - src/rfid_layer2.c

   1 /* librfid - layer 2 protocol handler
   2  * (C) 2005-2006 by Harald Welte <laforge@gnumonks.org>
   3  */
   4
   5 /*
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License version 2
   8  *  as published by the Free Software Foundation
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <errno.h>
  23 #include <string.h> /* for memcpy */
  24
  25 #include <librfid/rfid.h>
  26 #include <librfid/rfid_layer2.h>
  27
  28 static const struct rfid_layer2 *rfid_layer2s[] = {
  29         [RFID_LAYER2_ISO14443A] = &rfid_layer2_iso14443a,
  30         [RFID_LAYER2_ISO14443B] = &rfid_layer2_iso14443b,
  31         [RFID_LAYER2_ISO15693]  = &rfid_layer2_iso15693,
  32 };
  33
  34 struct rfid_layer2_handle *
  35 rfid_layer2_init(struct rfid_reader_handle *rh, unsigned int id)
  36 {
  37         struct rfid_layer2 *p;
  38
  39         if (id >= ARRAY_SIZE(rfid_layer2s)) {
  40                 DEBUGP("unable to find matching layer2 protocol\n");
  41                 return NULL;
  42         }
  43
  44         p = rfid_layer2s[id];
  45         return p->fn.init(rh);
  46 }
  47
  48 int
  49 rfid_layer2_open(struct rfid_layer2_handle *ph)
  50 {
  51         if (!ph->l2->fn.open)
  52                 return 0;
  53
  54         return ph->l2->fn.open(ph);
  55 }
  56
  57 int
  58 rfid_layer2_transceive(struct rfid_layer2_handle *ph,
  59                         enum rfid_frametype frametype,
  60                          const unsigned char *tx_buf, unsigned int len,
  61                          unsigned char *rx_buf, unsigned int *rx_len,
  62                          u_int64_t timeout, unsigned int flags)
  63 {
  64         if (!ph->l2->fn.transceive)
  65                 return -EIO;
  66
  67         return ph->l2->fn.transceive(ph, frametype, tx_buf, len, rx_buf,
  68                                      rx_len, timeout, flags);
  69 }
  70
  71 int rfid_layer2_fini(struct rfid_layer2_handle *ph)
  72 {
  73         if (!ph->l2->fn.fini)
  74                 return 0;
  75
  76         return ph->l2->fn.fini(ph);
  77 }
  78
  79 int
  80 rfid_layer2_close(struct rfid_layer2_handle *ph)
  81 {
  82         if (!ph->l2->fn.close)
  83                 return 0;
  84
  85         return ph->l2->fn.close(ph);
  86 }
  87
  88 int
  89 rfid_layer2_getopt(struct rfid_layer2_handle *ph, int optname,
  90                    void *optval, unsigned int *optlen)
  91 {
  92         if (optname >> 16 == 0) {
  93                 unsigned char *optchar = optval;
  94
  95                 switch (optname) {
  96                 case RFID_OPT_LAYER2_UID:
  97                         if (ph->uid_len < *optlen)
  98                                 *optlen = ph->uid_len;
  99                         memcpy(optchar, ph->uid, *optlen);
 100                         break;
 101                 default:
 102                         return -EINVAL;
 103                         break;
 104                 }
 105         } else {
 106                 if (!ph->l2->fn.getopt)
 107                         return -EINVAL;
 108
 109                 return ph->l2->fn.getopt(ph, optname, optval, optlen);
 110         }
 111         return 0;
 112 }
 113
 114 int
 115 rfid_layer2_setopt(struct rfid_layer2_handle *ph, int optname,
 116                    const void *optval, unsigned int optlen)
 117 {
 118         if (optname >> 16 == 0) {
 119                 switch (optname) {
 120                 default:
 121                         return -EINVAL;
 122                         break;
 123                 }
 124         } else {
 125                 if (!ph->l2->fn.setopt)
 126                         return -EINVAL;
 127
 128                 return ph->l2->fn.setopt(ph, optname, optval, optlen);
 129         }
 130         return 0;
 131 }
 132
 133 char *rfid_layer2_name(struct rfid_layer2_handle *l2h)
 134 {
 135         return l2h->l2->name;
 136 }