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librfid/src/rfid_proto_tcl.c

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/* ISO 14443-4 (T=CL) implementation, PCD side.
*
* (C) 2005-2006 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <librfid/rfid.h>
#include <librfid/rfid_protocol_tcl.h>
#include <librfid/rfid_protocol.h>
#include <librfid/rfid_layer2.h>
#include <librfid/rfid_layer2_iso14443b.h>
#include <librfid/rfid_asic.h>
#include <librfid/rfid_reader.h>
#include "rfid_iso14443_common.h"
#define RFID_MAX_FRAMELEN 256
#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 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 Type B 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 (h->priv.tcl.fsc > h->l2h->rh->ah->mtu)
h->priv.tcl.fsc = h->l2h->rh->ah->mtu;
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;
DEBUGP("This PICC supports NAD\n");
}
if (*cur & 0x02) {
h->priv.tcl.flags |= TCL_HANDLE_F_CID_SUPPORTED;
DEBUGP("This PICC supports CID\n");
}
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);
/* transceive (with CRC) */
ret = rfid_layer2_transceive(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("transceive 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_14443A_SPEED_848K))
DI = PPS_DIV_8;
else if ((D & ATS_TA_DIV_4) && (speed & RFID_14443A_SPEED_424K))
DI = PPS_DIV_4;
else if ((D & ATS_TA_DIV_2) && (speed & RFID_14443A_SPEED_212K))
DI = PPS_DIV_2;
else
DI = PPS_DIV_1;
return DI;
}
static unsigned int di_to_speed(unsigned char DI)
{
switch (DI) {
case PPS_DIV_8:
return RFID_14443A_SPEED_848K;
break;
case PPS_DIV_4:
return RFID_14443A_SPEED_424K;
break;
case PPS_DIV_2:
return RFID_14443A_SPEED_212K;
break;
case PPS_DIV_1:
return RFID_14443A_SPEED_106K;
break;
}
}
/* start a PPS run (autimatically configure highest possible speed */
static int
tcl_do_pps(struct rfid_protocol_handle *h)
{
int ret;
unsigned char ppss[3];
/* FIXME: this stinks like hell. IF we reduce pps_response size to one,
we'll get stack corruption! */
unsigned char pps_response[10];
unsigned int rx_len = 1;
unsigned char Dr, Ds, DrI, DsI;
unsigned int speed;
if (h->priv.tcl.state != TCL_STATE_ATS_RCVD)
return -1;
Dr = h->priv.tcl.ta & 0x07;
Ds = h->priv.tcl.ta & 0x70 >> 4;
DEBUGP("Dr = 0x%x, Ds = 0x%x\n", Dr, Ds);
if (Dr != Ds && !(h->priv.tcl.ta & 0x80)) {
/* device supports different divisors for rx and tx, but not
* really ?!? */
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;
ppss[2] = 0x00;
/* FIXME: deal with different speed for each direction */
DrI = d_to_di(h, Dr);
DsI = d_to_di(h, Ds);
DEBUGP("DrI = 0x%x, DsI = 0x%x\n", DrI, DsI);
ppss[2] = (ppss[2] & 0xf0) | (DrI | DsI << 2);
ret = rfid_layer2_transceive(h->l2h, RFID_14443A_FRAME_REGULAR,
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;
}
speed = di_to_speed(DrI);
ret = rfid_layer2_setopt(h->l2h, RFID_OPT_14443A_SPEED_RX,
&speed, sizeof(speed));
if (ret < 0)
return ret;
ret = rfid_layer2_setopt(h->l2h, RFID_OPT_14443A_SPEED_TX,
&speed, sizeof(speed));
if (ret < 0)
return ret;
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 (!is_s_block(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 */
if ((th->flags & TCL_HANDLE_F_NAD_USED) && is_i_block(pcb)) {
/* 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;
}
h->priv.tcl.state = TCL_STATE_ESTABLISHED;
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 = rfid_layer2_transceive(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;
}
struct fr_buff {
unsigned int frame_len; /* length of frame */
unsigned int hdr_len; /* length of header within frame */
unsigned char data[RFID_MAX_FRAMELEN];
};
#define frb_payload(x) (x.data + x.hdr_len)
/* RFID transceive buffer. */
struct rfid_xcvb {
struct rfix_xcvb *next; /* next in queue of buffers */
u_int64_t timeout; /* timeout to wait for reply */
struct fr_buff tx;
struct fr_buff rx;
//struct rfid_protocol_handle *h; /* connection to which we belong */
};
struct tcl_tx_context {
const unsigned char *tx;
unsigned char *rx;
const unsigned char *next_tx_byte;
unsigned char *next_rx_byte;
unsigned int rx_len;
unsigned int tx_len;
struct rfid_protocol_handle *h;
};
#define tcl_ctx_todo(ctx) (ctx->tx_len - (ctx->next_tx_byte - ctx->tx))
static int
tcl_refill_xcvb(struct rfid_xcvb *xcvb, struct tcl_tx_context *ctx)
{
struct tcl_handle *th = &ctx->h->priv.tcl;
if (ctx->next_tx_byte >= ctx->tx + ctx->tx_len) {
DEBUGP("tyring to refill tx xcvb but no data left!\n");
return -1;
}
if (tcl_build_prologue_i(th, xcvb->tx.data,
&xcvb->tx.hdr_len) < 0)
return -1;
if (tcl_ctx_todo(ctx) > th->fsc - xcvb->tx.hdr_len)
xcvb->tx.frame_len = max_net_tx_framesize(th);
else
xcvb->tx.frame_len = tcl_ctx_todo(ctx);
memcpy(frb_payload(xcvb->tx), ctx->next_tx_byte,
xcvb->tx.frame_len);
ctx->next_tx_byte += xcvb->tx.frame_len;
/* check whether we need to set the chaining bit */
if (ctx->next_tx_byte < ctx->tx + ctx->tx_len)
xcvb->tx.data[0] |= 0x10;
/* add hdr_len after copying the net payload */
xcvb->tx.frame_len += xcvb->tx.hdr_len;
xcvb->timeout = th->fwt;
return 0;
}
static void fill_xcvb_wtxm(struct tcl_handle *th, struct rfid_xcvb *xcvb,
unsigned char inf)
{
/* Acknowledge WTXM */
tcl_build_prologue_s(th, xcvb->tx.data, &xcvb->tx.hdr_len);
/* set two bits that make this block a wtx */
xcvb->tx.data[0] |= 0x30;
xcvb->tx.data[xcvb->tx.hdr_len] = inf;
xcvb->tx.frame_len = xcvb->tx.hdr_len+1;
xcvb->timeout = th->fwt * inf;
}
static int check_cid(struct tcl_handle *th, struct rfid_xcvb *xcvb)
{
if (xcvb->rx.data[0] & TCL_PCB_CID_FOLLOWING) {
if (xcvb->rx.data[1] != th->cid) {
DEBUGP("CID %u is not valid, we expected %u\n",
xcvb->rx.data[1], th->cid);
return 0;
}
}
return 1;
}
static int
tcl_transceive(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;
struct rfid_xcvb xcvb;
struct tcl_tx_context tcl_ctx;
struct tcl_handle *th = &h->priv.tcl;
unsigned char ack[10];
unsigned int ack_len;
/* initialize context */
tcl_ctx.next_tx_byte = tcl_ctx.tx = tx_data;
tcl_ctx.next_rx_byte = tcl_ctx.rx = rx_data;
tcl_ctx.rx_len = *rx_len;
tcl_ctx.tx_len = tx_len;
tcl_ctx.h = h;
/* initialize xcvb */
xcvb.timeout = th->fwt;
tx_refill:
if (tcl_refill_xcvb(&xcvb, &tcl_ctx) < 0) {
ret = -1;
goto out;
}
do_tx:
xcvb.rx.frame_len = sizeof(xcvb.rx.data);
ret = rfid_layer2_transceive(h->l2h, l2_to_frame(h->l2h->l2->id),
xcvb.tx.data, xcvb.tx.frame_len,
xcvb.rx.data, &xcvb.rx.frame_len,
xcvb.timeout, 0);
DEBUGP("l2 transceive finished\n");
if (ret < 0)
goto out;
if (is_r_block(xcvb.rx.data[0])) {
DEBUGP("R-Block\n");
if ((xcvb.rx.data[0] & 0x01) != h->priv.tcl.toggle) {
DEBUGP("response with wrong toggle bit\n");
goto out;
}
/* Handle ACK frame in case of chaining */
if (!check_cid(th, &xcvb))
goto out;
goto tx_refill;
} else if (is_s_block(xcvb.rx.data[0])) {
unsigned char inf;
unsigned int prlg_len;
DEBUGP("S-Block\n");
/* Handle Wait Time Extension */
if (!check_cid(th, &xcvb))
goto out;
if (xcvb.rx.data[0] & TCL_PCB_CID_FOLLOWING) {
if (xcvb.rx.frame_len < 3) {
DEBUGP("S-Block with CID but short len\n");
ret = -1;
goto out;
}
inf = xcvb.rx.data[2];
} else
inf = xcvb.rx.data[1];
if ((xcvb.rx.data[0] & 0x30) != 0x30) {
DEBUGP("S-Block but not WTX?\n");
ret = -1;
goto out;
}
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;
}
fill_xcvb_wtxm(th, &xcvb, inf);
/* start over with next transceive */
goto do_tx;
} else if (is_i_block(xcvb.rx.data[0])) {
unsigned int net_payload_len;
/* we're actually receiving payload data */
DEBUGP("I-Block: ");
if ((xcvb.rx.data[0] & 0x01) != h->priv.tcl.toggle) {
DEBUGP("response with wrong toggle bit\n");
goto out;
}
xcvb.rx.hdr_len = 1;
if (!check_cid(th, &xcvb))
goto out;
if (xcvb.rx.data[0] & TCL_PCB_CID_FOLLOWING)
xcvb.rx.hdr_len++;
if (xcvb.rx.data[0] & TCL_PCB_NAD_FOLLOWING)
xcvb.rx.hdr_len++;
net_payload_len = xcvb.rx.frame_len - xcvb.rx.hdr_len;
DEBUGPC("%u bytes\n", net_payload_len);
memcpy(tcl_ctx.next_rx_byte, &xcvb.rx.data[xcvb.rx.hdr_len],
net_payload_len);
tcl_ctx.next_rx_byte += net_payload_len;
if (xcvb.rx.data[0] & 0x10) {
/* we're not the last frame in the chain, continue rx */
DEBUGP("not the last frame in the chain, continue\n");
ack_len = sizeof(ack);
tcl_build_prologue_r(th, xcvb.tx.data, &xcvb.tx.frame_len, 0);
xcvb.timeout = th->fwt;
goto do_tx;
}
}
out:
*rx_len = tcl_ctx.next_rx_byte - tcl_ctx.rx;
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_protocol_handle(sizeof(struct rfid_protocol_handle));
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));
/* 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_protocol_handle(ph);
return 0;
}
int
tcl_getopt(struct rfid_protocol_handle *h, int optname, void *optval,
unsigned int *optlen)
{
u_int8_t *opt_str = optval;
switch (optname) {
case RFID_OPT_P_TCL_ATS:
if (h->priv.tcl.ats_len < *optlen)
*optlen = h->priv.tcl.ats_len;
memcpy(opt_str, h->priv.tcl.ats, *optlen);
break;
case RFID_OPT_P_TCL_ATS_LEN:
if (*optlen < sizeof(u_int8_t))
return -E2BIG;
*optlen = sizeof(u_int8_t);
*opt_str = h->priv.tcl.ats_len & 0xff;
break;
}
return 0;
}
int
tcl_setopt(struct rfid_protocol_handle *h, int optname, const void *optval,
unsigned int optlen)
{
int ret = -EINVAL;
switch (optname) {
default:
break;
}
return ret;
}
const struct rfid_protocol rfid_protocol_tcl = {
.id = RFID_PROTOCOL_TCL,
.name = "ISO 14443-4 / T=CL",
.fn = {
.init = &tcl_init,
.open = &tcl_connect,
.transceive = &tcl_transceive,
.close = &tcl_deselect,
.fini = &tcl_fini,
.getopt = &tcl_getopt,
.setopt = &tcl_setopt,
},
};
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