use autoconf/automake

git-svn-id: https://svn.gnumonks.org/trunk/librfid@1658 e0336214-984f-0b4b-a45f-81c69e1f0ede

1 files changed, 694 insertions, 0 deletions

diff --git a/src/rfid_proto_tcl.c b/src/rfid_proto_tcl.c
new file mode 100644
index 0000000..f070614
--- /dev/null
+++ b/src/rfid_proto_tcl.c
@@ -0,0 +1,694 @@
+/* ISO 14443-4 (T=CL) implementation, PCD side.
+ *
+ * (C) 2005 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 <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include <rfid/rfid.h>
+#include <rfid/rfid_protocol_tcl.h>
+#include <rfid/rfid_protocol.h>
+#include <rfid/rfid_layer2.h>
+#include <rfid/rfid_layer2_iso14443b.h>
+
+#include <rfid/rfid_asic.h>
+#include <rfid/rfid_reader.h>
+
+#include "rfid_iso14443_common.h"
+
+#if 1
+#ifdef DEBUGP
+#undef DEBUGP
+#define DEBUGP(x, ...)
+#define DEBUGPC(x, ...)
+#endif
+#endif
+
+static enum rfid_frametype l2_to_frame(unsigned int layer2)
+{
+	switch (layer2) {
+		case RFID_LAYER2_ISO14443A:
+			return RFID_14443A_FRAME_REGULAR;
+			break;
+		case RFID_LAYER2_ISO14443B:
+			return RFID_14443B_FRAME_REGULAR;
+			break;
+	}
+	return 0;
+}
+
+static unsigned int sfgi_to_sfgt(struct rfid_protocol_handle *h, 
+				 unsigned char sfgi)
+{
+	unsigned int multiplier;
+	unsigned int tmp;
+
+	if (sfgi > 14)
+		sfgi = 14;
+
+	multiplier = 1 << sfgi; /* 2 to the power of sfgi */
+
+	/* ISO 14443-4:2000(E) Section 5.2.5:
+	 * (256 * 16 / h->l2h->rh->ah->fc) * (2 ^ sfgi) */
+	tmp = (unsigned int) 1000000 * 256 * 16;
+
+	return (tmp / h->l2h->rh->ah->fc) * multiplier;
+}
+
+static unsigned int fwi_to_fwt(struct rfid_protocol_handle *h, 
+				unsigned char fwi)
+{
+	unsigned int multiplier, tmp;
+
+	if (fwi > 14)
+		fwi = 14;
+
+	multiplier  = 1 << fwi; /* 2 to the power of fwi */
+
+	/* ISO 14443-4:2000(E) Section 7.2.:
+	 * (256*16 / h->l2h->rh->ah->fc) * (2 ^ fwi) */
+
+	tmp = (unsigned int) 1000000 * 256 * 16;
+
+	return (tmp / h->l2h->rh->ah->fc) * multiplier;
+}
+
+/* 4.9seconds as microseconds (4.9 billion seconds) exceeds 2^32 */
+#define activation_fwt(x) (((u_int64_t)1000000 * 65536 / x->l2h->rh->ah->fc))
+#define deactivation_fwt(x) activation_fwt(x)
+
+static int
+tcl_parse_ats(struct rfid_protocol_handle *h, 
+		unsigned char *ats, unsigned int size)
+{
+	unsigned char len = ats[0];
+	unsigned char t0;
+	unsigned char *cur;
+
+	if (len == 0 || size == 0) 
+		return -1;
+
+	if (size < len)
+		len = size;
+
+	h->priv.tcl.ta = 0;
+
+	if (len == 1) {
+		/* FIXME: assume some default values */
+		h->priv.tcl.fsc = 32;
+		h->priv.tcl.ta = 0x80;	/* 0x80 (same d for both dirs) */
+		h->priv.tcl.sfgt = sfgi_to_sfgt(h, 0);
+		if (h->l2h->l2->id == RFID_LAYER2_ISO14443A) {
+			/* Section 7.2: fwi default for type A is 4 */
+			h->priv.tcl.fwt = fwi_to_fwt(h, 4);
+		} else {
+			/* Section 7.2: fwi for type B is always in ATQB */
+			/* Value is assigned in tcl_connect() */
+			/* This function is never called for Type B, since it has no (R)ATS */
+		}
+		return 0;
+	}
+
+	/* guarateed to be at least 2 bytes in size */
+
+	t0 = ats[1];
+	cur = &ats[2];
+
+	iso14443_fsdi_to_fsd(&h->priv.tcl.fsc, t0 & 0x0f);
+
+	if (t0 & (1 << 4)) {
+		/* TA is transmitted */
+		h->priv.tcl.ta = *cur++;
+	}
+
+	if (t0 & (1 << 5)) {
+		/* TB is transmitted */
+		h->priv.tcl.sfgt = sfgi_to_sfgt(h, *cur & 0x0f);
+		h->priv.tcl.fwt = fwi_to_fwt(h, (*cur & 0xf0) >> 4);
+		cur++;
+	}
+
+	if (t0 & (1 << 6)) {
+		/* TC is transmitted */
+		if (*cur & 0x01)
+			h->priv.tcl.flags |= TCL_HANDLE_F_NAD_SUPPORTED;
+		if (*cur & 0x02)
+			h->priv.tcl.flags |= TCL_HANDLE_F_CID_SUPPORTED;
+		cur++;
+	}
+
+	h->priv.tcl.historical_len = (ats+len) - cur;
+	h->priv.tcl.historical_bytes = cur;
+
+	return 0;
+}
+
+
+/* request an ATS from the PICC */
+static int
+tcl_request_ats(struct rfid_protocol_handle *h)
+{
+	int ret;
+	unsigned char rats[2];
+	unsigned char fsdi;
+
+	if (h->priv.tcl.state != TCL_STATE_INITIAL)
+		return -1;
+
+	ret = iso14443_fsd_to_fsdi(&fsdi, h->priv.tcl.fsd);
+	if (ret < 0) {
+		DEBUGP("unable to encode FSD of %u as FSDI\n", h->priv.tcl.fsd);
+		return ret;
+	}
+
+	rats[0] = 0xe0;
+	rats[1] = (h->priv.tcl.cid & 0x0f) | ((fsdi << 4) & 0xf0);
+
+	/* transcieve (with CRC) */
+	ret = h->l2h->l2->fn.transcieve(h->l2h, RFID_14443A_FRAME_REGULAR,
+					rats, 2, h->priv.tcl.ats,
+				       &h->priv.tcl.ats_len, activation_fwt(h),
+				       TCL_TRANSP_F_TX_CRC);
+	if (ret < 0) {
+		DEBUGP("transcieve of rats failed\n");
+		h->priv.tcl.state = TCL_STATE_RATS_SENT;
+		/* FIXME: retransmit */
+		return ret;
+	}
+	h->priv.tcl.state = TCL_STATE_ATS_RCVD;
+
+	ret = tcl_parse_ats(h, h->priv.tcl.ats, h->priv.tcl.ats_len);
+	if (ret < 0) {
+		DEBUGP("parsing of ats failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+#define ATS_TA_DIV_2	1
+#define ATS_TA_DIV_4	2
+#define ATS_TA_DIV_8	4
+
+#define PPS_DIV_8	3
+#define PPS_DIV_4	2
+#define PPS_DIV_2	1
+#define PPS_DIV_1	0
+static unsigned char d_to_di(struct rfid_protocol_handle *h, unsigned char D)
+{
+	static char DI;
+	unsigned int speed = h->l2h->rh->reader->iso14443a.speed;
+	
+	if ((D & ATS_TA_DIV_8) && (speed & RFID_READER_SPEED_848K))
+		DI = PPS_DIV_8;
+	else if ((D & ATS_TA_DIV_4) && (speed & RFID_READER_SPEED_424K))
+		DI = PPS_DIV_4;
+	else if ((D & ATS_TA_DIV_2) && (speed & RFID_READER_SPEED_212K))
+		DI = PPS_DIV_2;
+	else
+		DI = PPS_DIV_1;
+
+	return DI;
+}
+
+
+/* start a PSS run (autimatically configure highest possible speed */
+static int 
+tcl_do_pps(struct rfid_protocol_handle *h)
+{
+#if 0
+	int ret;
+	unsigned char ppss[3];
+	unsigned char pps_response[1];
+	unsigned int rx_len = 1;
+	unsigned char Dr, Ds, DrI, DsI;
+
+	if (h->priv.tcl.state != TCL_STATE_ATS_RCVD)
+		return -1;
+
+	Dr = h->priv.tcl.ta & 0x07;
+	Ds = h->priv.tcl.ta & 0x70 >> 4;
+
+	if (Dr != Ds && !(h->priv.tcl.ta & 0x80)) {
+		/* device supports different divisors for rx and tx, but not ?!? */
+		DEBUGP("PICC has contradictory TA, aborting PPS\n");
+		return -1;
+	};
+
+	/* ISO 14443-4:2000(E) Section 5.3. */
+
+	ppss[0] = 0xd0 & (h->priv.tcl.cid & 0x0f);
+	ppss[1] = 0x11;
+
+	/* FIXME: deal with different speed for each direction */
+	DrI = d_to_di(h, Dr);
+	DsI = d_to_di(h, Ds);
+
+	ppss[2] = (ppss[2] & 0xf0) | (DrI | DsI << 2);
+
+	ret = h->l2h->l2->fn.transcieve(h->l2h, ppss, 3, pps_response,
+					&rx_len, h->priv.tcl.fwt,
+					TCL_TRANSP_F_TX_CRC);
+	if (ret < 0)
+		return ret;
+
+	if (pps_response[0] != ppss[0]) {
+		DEBUGP("PPS Response != PPSS\n");
+		return -1;
+	}
+	
+	h->priv.tcl.state = TCL_STATE_ESTABLISHED;
+#endif
+	return 0;
+}
+
+
+static int
+tcl_build_prologue2(struct tcl_handle *th, 
+		    unsigned char *prlg, unsigned int *prlg_len, 
+		    unsigned char pcb)
+{
+	*prlg_len = 1;
+
+	*prlg = pcb;
+
+	if (th->toggle) {
+		/* we've sent a toggle bit last time */
+		th->toggle = 0;
+	} else {
+		/* we've not sent a toggle last time: send one */
+		th->toggle = 1;
+		*prlg |= 0x01;
+	}
+
+	if (th->flags & TCL_HANDLE_F_CID_USED) {
+		/* ISO 14443-4:2000(E) Section 7.1.1.2 */
+		*prlg |= TCL_PCB_CID_FOLLOWING;
+		(*prlg_len)++;
+		prlg[*prlg_len] = th->cid & 0x0f;
+	}
+
+	/* nad only for I-block (0xc0 == 00) */
+	if ((th->flags & TCL_HANDLE_F_NAD_USED) &&
+	    ((pcb & 0xc0) == 0x00)) {
+		/* ISO 14443-4:2000(E) Section 7.1.1.3 */
+		/* FIXME: in case of chaining only for first frame */
+		*prlg |= TCL_PCB_NAD_FOLLOWING;
+		prlg[*prlg_len] = th->nad;
+		(*prlg_len)++;
+	}
+
+	return 0;
+}
+
+static int
+tcl_build_prologue_i(struct tcl_handle *th,
+		     unsigned char *prlg, unsigned int *prlg_len)
+{
+	/* ISO 14443-4:2000(E) Section 7.1.1.1 */
+	return tcl_build_prologue2(th, prlg, prlg_len, 0x02);
+}
+
+static int
+tcl_build_prologue_r(struct tcl_handle *th,
+		     unsigned char *prlg, unsigned int *prlg_len,
+		     unsigned int nak)
+{
+	unsigned char pcb = 0xa2;
+	/* ISO 14443-4:2000(E) Section 7.1.1.1 */
+
+	if (nak)
+		pcb |= 0x10;
+
+	return tcl_build_prologue2(th, prlg, prlg_len, pcb);
+}
+
+static int
+tcl_build_prologue_s(struct tcl_handle *th,
+		     unsigned char *prlg, unsigned int *prlg_len)
+{
+	/* ISO 14443-4:2000(E) Section 7.1.1.1 */
+
+	/* the only S-block from PCD->PICC is DESELECT,
+	 * well, actually there is the S(WTX) response. */
+	return tcl_build_prologue2(th, prlg, prlg_len, 0xc2);
+}
+
+/* FIXME: WTXM implementation */
+
+static int tcl_prlg_len(struct tcl_handle *th)
+{
+	int prlg_len = 1;
+
+	if (th->flags & TCL_HANDLE_F_CID_USED)
+		prlg_len++;
+
+	if (th->flags & TCL_HANDLE_F_NAD_USED)
+		prlg_len++;
+
+	return prlg_len;
+}
+
+#define max_net_tx_framesize(x)	(x->fsc - tcl_prlg_len(x))
+
+static int
+tcl_connect(struct rfid_protocol_handle *h)
+{
+	int ret; 
+
+	if (h->priv.tcl.state != TCL_STATE_DESELECTED &&
+	    h->priv.tcl.state != TCL_STATE_INITIAL)
+		return -1;
+
+	switch (h->l2h->l2->id) {
+	case RFID_LAYER2_ISO14443A:
+		/* Start Type A T=CL Activation Sequence */
+		ret = tcl_request_ats(h);
+		if (ret < 0)
+			return ret;
+
+		/* Only do PPS if any non-default divisors supported */
+		if (h->priv.tcl.ta & 0x77) {
+			ret = tcl_do_pps(h);
+			if (ret < 0)
+				return ret;
+		}
+		break;
+	case RFID_LAYER2_ISO14443B:
+		/* initialized T=CL state from Type B Activation Data */
+		h->priv.tcl.cid = h->l2h->priv.iso14443b.cid;
+		h->priv.tcl.fsc = h->l2h->priv.iso14443b.fsc;
+		h->priv.tcl.fsd = h->l2h->priv.iso14443b.fsd;
+		h->priv.tcl.fwt = h->l2h->priv.iso14443b.fwt;
+
+		/* what about ta? sfgt? */
+
+		if (h->l2h->priv.iso14443b.flags & ISO14443B_CID_SUPPORTED)
+			h->priv.tcl.flags |= TCL_HANDLE_F_CID_SUPPORTED;
+		if (h->l2h->priv.iso14443b.flags & ISO14443B_NAD_SUPPORTED)
+			h->priv.tcl.flags |= TCL_HANDLE_F_NAD_SUPPORTED;
+
+		switch (h->l2h->priv.iso14443b.state) {
+			case ISO14443B_STATE_SELECTED:
+				h->priv.tcl.state = TCL_STATE_ATS_RCVD;
+				break;
+			case ISO14443B_STATE_ATTRIB_SENT:
+				h->priv.tcl.state = TCL_STATE_RATS_SENT;
+				break;
+		}
+
+		/* PUPI will be presented as ATS/historical bytes */
+		memcpy(h->priv.tcl.ats, h->l2h->uid, 4);
+		h->priv.tcl.ats_len = 4;
+		h->priv.tcl.historical_bytes = h->priv.tcl.ats;
+
+		break;
+	default:
+		DEBUGP("unsupported l2: %u\n", h->l2h->l2->id);
+		return -1;
+		break;
+	}
+
+	return 0;
+}
+
+static int
+tcl_deselect(struct rfid_protocol_handle *h)
+{
+	/* ISO 14443-4:2000(E) Section 8 */
+	int ret;
+	unsigned char frame[3];		/* 3 bytes prologue, no information */
+	unsigned char rx[3];
+	unsigned int rx_len = sizeof(rx);
+	unsigned int prlg_len;
+	struct tcl_handle *th = &h->priv.tcl;
+
+	if (th->state != TCL_STATE_ESTABLISHED) {
+		/* FIXME: not sure whether deselect is possible here,
+		 * probably better send a HLTA? */
+	}
+
+	/* build DESELECT S-block */
+	ret = tcl_build_prologue_s(th, frame, &prlg_len);
+	if (ret < 0)
+		return ret;
+
+	ret = h->l2h->l2->fn.transcieve(h->l2h, RFID_14443A_FRAME_REGULAR,
+					frame, prlg_len, rx,
+				     &rx_len, deactivation_fwt(h),
+				     TCL_TRANSP_F_TX_CRC);
+	if (ret < 0) {
+		/* FIXME: retransmit, HLT(A|B) */
+		return ret;
+	}
+
+	th->state = TCL_STATE_DESELECTED;
+
+	return 0;
+}
+
+#define is_s_block(x) ((x & 0xc0) == 0xc0)
+#define is_r_block(x) ((x & 0xc0) == 0x80)
+#define is_i_block(x) ((x & 0xc0) == 0x00)
+
+static int
+tcl_transcieve(struct rfid_protocol_handle *h,
+		const unsigned char *tx_data, unsigned int tx_len,
+		unsigned char *rx_data, unsigned int *rx_len,
+		unsigned int timeout, unsigned int flags)
+{
+	int ret;
+	unsigned char *tx_buf, *rx_buf;
+	unsigned char *_rx_data = rx_data;
+	unsigned int _rx_len;
+	unsigned int max_rx_len = *rx_len; /* maximum number of payoload that
+					      caller has requested */
+	unsigned int prlg_len;
+	struct tcl_handle *th = &h->priv.tcl;
+
+	unsigned char *_tx;
+	unsigned int _tx_len, _timeout;
+	unsigned char wtx_resp[3];
+	unsigned char ack[10];
+	unsigned int ack_len;
+
+	if (tx_len > max_net_tx_framesize(th)) {
+		/* slow path: we need to use chaining */
+		return -1;
+	}
+
+	tx_buf = malloc(tcl_prlg_len(th) + tx_len);
+	if (!tx_buf) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	rx_buf = malloc(tcl_prlg_len(th) + *rx_len);
+	if (!rx_buf) {
+		ret = -ENOMEM;
+		goto out_txb;
+	}
+
+	if (tcl_build_prologue_i(th, tx_buf, &prlg_len) < 0) {
+		ret = -1;
+		goto out_rxb;
+	}
+	memcpy(tx_buf + prlg_len, tx_data, tx_len);
+
+	/* intialize to data-to-be-transferred */
+	_tx = tx_buf;
+	_tx_len = tx_len+prlg_len;
+	_timeout = th->fwt;
+	_rx_len = *rx_len;
+	*rx_len = 0;
+
+do_tx:
+	ret = h->l2h->l2->fn.transcieve(h->l2h, l2_to_frame(h->l2h->l2->id),
+					_tx, _tx_len,
+					rx_buf, &_rx_len, _timeout, 0);
+	DEBUGP("l2 transcieve finished\n");
+	if (ret < 0)
+		goto out_rxb;
+
+	if ((*rx_buf & 0x01) != h->priv.tcl.toggle) {
+		DEBUGP("response with wrong toggle bit\n");
+		goto out_rxb;
+	}
+
+	if (is_r_block(*rx_buf)) {
+		unsigned int txed = _tx - tx_buf;
+		DEBUGP("R-Block\n");
+		/* Handle ACK frame in case of chaining */
+		if (*rx_buf & TCL_PCB_CID_FOLLOWING) {
+			if (*(rx_buf+1) != h->priv.tcl.cid) {
+				DEBUGP("CID %u is not valid\n", *(rx_buf)+1);
+				goto out_rxb;
+			}
+		}
+		/* set up parameters for next frame in chain */
+		if (txed < tx_len) {
+			/* move tx pointer by the amount of bytes transferred
+			 * in last frame */
+			_tx += _tx_len;
+			_tx_len = (tx_len - txed);
+			if (_tx_len > max_net_tx_framesize(th)) {
+				/* not last frame in chain */
+				_tx_len = max_net_tx_framesize(th);
+			} else {
+				/* last frame in chain */
+			}
+			goto do_tx;
+		} else {
+			DEBUGP("Received ACK in response to last frame in "
+			       "chain?!? Expected I-frame.\n");
+			ret = -1;
+			goto out_rxb;
+		}
+	} else if (is_s_block(*rx_buf)) {
+		unsigned char inf;
+		unsigned int prlg_len;
+
+		DEBUGP("S-Block\n");
+		/* Handle Wait Time Extension */
+		if (*rx_buf & TCL_PCB_CID_FOLLOWING) {
+			if (_rx_len < 3) {
+				DEBUGP("S-Block with CID but short len\n");
+				ret = -1;
+				goto out_rxb;
+			}
+			if (*(rx_buf+1) != h->priv.tcl.cid) {
+				DEBUGP("CID %u is not valid\n", *(rx_buf)+1);
+				goto out_rxb;
+			}
+			inf = *(rx_buf+2);
+		} else
+			inf = *(rx_buf+1);
+
+		if ((*rx_buf & 0x30) != 0x30) {
+			DEBUGP("S-Block but not WTX?\n");
+			ret = -1;
+			goto out_rxb;
+		}
+		inf &= 0x3f;	/* only lower 6 bits code WTXM */
+		if (inf == 0 || (inf >= 60 && inf <= 63)) {
+			DEBUGP("WTXM %u is RFU!\n", inf);
+			ret = -1;
+			goto out_rxb;
+		}
+		
+		/* Acknowledge WTXM */
+		tcl_build_prologue_s(&h->priv.tcl, wtx_resp, &prlg_len);
+		/* set two bits that make this block a wtx */
+		wtx_resp[0] |= 0x30;
+		wtx_resp[prlg_len] = inf;
+		_tx = wtx_resp;
+		_tx_len = prlg_len+1;
+		_timeout = th->fwt * inf;
+
+		/* start over with next transcieve */
+		goto do_tx; /* FIXME: do transcieve locally since we use
+				totally different buffer */
+
+	} else if (is_i_block(*rx_buf)) {
+		unsigned char *inf = rx_buf+1;
+		unsigned int net_payload_len;
+		/* we're actually receiving payload data */
+
+		DEBUGP("I-Block: ");
+		if (*rx_buf & TCL_PCB_CID_FOLLOWING) {
+			if (*(rx_buf+1) != h->priv.tcl.cid) {
+				DEBUGPC("CID %u is not valid\n", *(rx_buf)+1);
+				goto out_rxb;
+			}
+			inf++;
+		}
+		if (*rx_buf & TCL_PCB_NAD_FOLLOWING) {
+			inf++;
+		}
+		net_payload_len = _rx_len - (inf - rx_buf);
+		DEBUGPC("%u bytes\n", net_payload_len);
+		memcpy(_rx_data, inf, net_payload_len);
+		/* increment the number of payload bytes that we actually received */
+		*rx_len += net_payload_len;
+		_rx_data += net_payload_len;
+
+		if (*rx_buf & 0x10) {
+			/* we're not the last frame in the chain, continue rx */
+			DEBUGP("we're not the last frame in the chain, continue\n");
+			ack_len = sizeof(ack);
+			tcl_build_prologue_r(&h->priv.tcl, ack, &ack_len, 0);
+			_tx = ack;
+			_tx_len = ack_len;
+			goto do_tx;
+		}
+	}
+
+out_rxb:
+	free(rx_buf);
+out_txb:
+	free(tx_buf);
+out:
+	return ret;
+}
+
+static struct rfid_protocol_handle *
+tcl_init(struct rfid_layer2_handle *l2h)
+{
+	struct rfid_protocol_handle *th;
+	unsigned int mru = l2h->rh->ah->mru;
+
+	th = malloc(sizeof(struct rfid_protocol_handle) + mru);
+	if (!th)
+		return NULL;
+
+	/* FIXME: mru should be attribute of layer2 (in case it adds/removes
+	 * some overhead */
+	memset(th, 0, sizeof(struct rfid_protocol_handle) + mru);
+
+	/* maximum received ats length equals mru of asic/reader */
+	th->priv.tcl.state = TCL_STATE_INITIAL;
+	th->priv.tcl.ats_len = mru;
+	th->priv.tcl.toggle = 1;
+
+	th->priv.tcl.fsd = iso14443_fsd_approx(mru);
+
+	return th;
+}
+
+static int
+tcl_fini(struct rfid_protocol_handle *ph)
+{
+	free(ph);
+	return 0;
+}
+
+struct rfid_protocol rfid_protocol_tcl = {
+	.id	= RFID_PROTOCOL_TCL,
+	.name	= "ISO 14443-4 / T=CL",
+	.fn	= {
+		.init = &tcl_init,
+		.open = &tcl_connect,
+		.transcieve = &tcl_transcieve,
+		.close = &tcl_deselect,
+		.fini = &tcl_fini,
+	},
+};