+/* RFID scanning implementation
+ *
+ * (C) 2006 by Harald Welte <laforge@gnumonks.org>
+ *
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <librfid/rfid.h>
+#include <librfid/rfid_layer2.h>
+#include <librfid/rfid_reader.h>
+#include <librfid/rfid_protocol.h>
+
+static struct rfid_layer2_handle *
+rfid_layer2_scan1(struct rfid_reader_handle *rh, int l2)
+{
+ struct rfid_layer2_handle *l2h;
+
+ if (rh->reader->l2_supported & (1 << l2)) {
+ l2h = rfid_layer2_init(rh, l2);
+ if (!l2h)
+ return NULL;
+ if (rfid_layer2_open(l2h) < 0) {
+ rfid_layer2_fini(l2h);
+ return NULL;
+ } else
+ return l2h;
+ }
+
+ return NULL;
+}
+
+static struct rfid_layer2_handle *
+rfid_layer2_scan(struct rfid_reader_handle *rh)
+{
+ struct rfid_layer2_handle *l2h;
+ int i;
+
+#define RFID_LAYER2_MAX 16
+ for (i = 0; i < RFID_LAYER2_MAX; i++) {
+ l2h = rfid_layer2_scan1(rh, i);
+ if (l2h)
+ return l2h;
+ }
+
+ return NULL;
+}
+
+static struct rfid_protocol_handle *
+rfid_protocol_scan1(struct rfid_layer2_handle *l2h, int proto)
+{
+ struct rfid_protocol_handle *ph;
+
+ if (l2h->rh->reader->proto_supported & (1 << proto) &&
+ l2h->proto_supported & (1 << proto)) {
+ ph = rfid_protocol_init(l2h, proto);
+ if (!ph)
+ return NULL;
+ if (rfid_protocol_open(ph) < 0) {
+ rfid_protocol_fini(ph);
+ return NULL;
+ } else
+ return ph;
+ }
+
+ return NULL;
+}
+
+static struct rfid_protocol_handle *
+rfid_protocol_scan(struct rfid_layer2_handle *l2h)
+{
+ struct rfid_protocol_handle *ph;
+ int i;
+
+#define RFID_PROTOCOL_MAX 16
+ for (i = 0; i < RFID_PROTOCOL_MAX; i++) {
+ ph = rfid_protocol_scan1(l2h, i);
+ if (ph)
+ return ph;
+ }
+
+ return NULL;
+}
+
+/* Scan for any RFID transponder within range of the given reader.
+ * Abort after the first successfully found transponder. */
+int rfid_scan(struct rfid_reader_handle *rh,
+ struct rfid_layer2_handle **l2h,
+ struct rfid_protocol_handle **ph)
+{
+ *l2h = rfid_layer2_scan(rh);
+ if (!*l2h)
+ return 0;
+
+ *ph = rfid_protocol_scan(l2h);
+ if (!*ph)
+ return 2;
+
+ return 3;
+}
projects / librfid / commitdiff