2 * NFC Digital Protocol stack
3 * Copyright (c) 2013, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 #define pr_fmt(fmt) "digital: %s: " fmt, __func__
20 #define DIGITAL_NFC_DEP_FRAME_DIR_OUT 0xD4
21 #define DIGITAL_NFC_DEP_FRAME_DIR_IN 0xD5
23 #define DIGITAL_NFC_DEP_NFCA_SOD_SB 0xF0
25 #define DIGITAL_CMD_ATR_REQ 0x00
26 #define DIGITAL_CMD_ATR_RES 0x01
27 #define DIGITAL_CMD_PSL_REQ 0x04
28 #define DIGITAL_CMD_PSL_RES 0x05
29 #define DIGITAL_CMD_DEP_REQ 0x06
30 #define DIGITAL_CMD_DEP_RES 0x07
32 #define DIGITAL_ATR_REQ_MIN_SIZE 16
33 #define DIGITAL_ATR_REQ_MAX_SIZE 64
35 #define DIGITAL_NFCID3_LEN ((u8)8)
36 #define DIGITAL_LR_BITS_PAYLOAD_SIZE_254B 0x30
37 #define DIGITAL_GB_BIT 0x02
39 #define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0)
41 #define DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT 0x10
43 #define DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
44 ((pfb) & DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT)
45 #define DIGITAL_NFC_DEP_MI_BIT_SET(pfb) ((pfb) & 0x10)
46 #define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08)
47 #define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & 0x04)
48 #define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03)
50 #define DIGITAL_NFC_DEP_PFB_I_PDU 0x00
51 #define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40
52 #define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80
54 struct digital_atr_req
{
65 struct digital_atr_res
{
77 struct digital_psl_req
{
85 struct digital_psl_res
{
91 struct digital_dep_req_res
{
97 static void digital_in_recv_dep_res(struct nfc_digital_dev
*ddev
, void *arg
,
98 struct sk_buff
*resp
);
100 static void digital_skb_push_dep_sod(struct nfc_digital_dev
*ddev
,
103 skb_push(skb
, sizeof(u8
));
105 skb
->data
[0] = skb
->len
;
107 if (ddev
->curr_rf_tech
== NFC_DIGITAL_RF_TECH_106A
)
108 *skb_push(skb
, sizeof(u8
)) = DIGITAL_NFC_DEP_NFCA_SOD_SB
;
111 static int digital_skb_pull_dep_sod(struct nfc_digital_dev
*ddev
,
119 if (ddev
->curr_rf_tech
== NFC_DIGITAL_RF_TECH_106A
)
120 skb_pull(skb
, sizeof(u8
));
123 if (size
!= skb
->len
)
126 skb_pull(skb
, sizeof(u8
));
131 static void digital_in_recv_atr_res(struct nfc_digital_dev
*ddev
, void *arg
,
132 struct sk_buff
*resp
)
134 struct nfc_target
*target
= arg
;
135 struct digital_atr_res
*atr_res
;
145 rc
= ddev
->skb_check_crc(resp
);
147 PROTOCOL_ERR("14.4.1.6");
151 rc
= digital_skb_pull_dep_sod(ddev
, resp
);
153 PROTOCOL_ERR("14.4.1.2");
157 if (resp
->len
< sizeof(struct digital_atr_res
)) {
162 gb_len
= resp
->len
- sizeof(struct digital_atr_res
);
164 atr_res
= (struct digital_atr_res
*)resp
->data
;
166 rc
= nfc_set_remote_general_bytes(ddev
->nfc_dev
, atr_res
->gb
, gb_len
);
170 rc
= nfc_dep_link_is_up(ddev
->nfc_dev
, target
->idx
, NFC_COMM_ACTIVE
,
173 ddev
->curr_nfc_dep_pni
= 0;
179 ddev
->curr_protocol
= 0;
182 int digital_in_send_atr_req(struct nfc_digital_dev
*ddev
,
183 struct nfc_target
*target
, __u8 comm_mode
, __u8
*gb
,
187 struct digital_atr_req
*atr_req
;
190 size
= DIGITAL_ATR_REQ_MIN_SIZE
+ gb_len
;
192 if (size
> DIGITAL_ATR_REQ_MAX_SIZE
) {
193 PROTOCOL_ERR("14.6.1.1");
197 skb
= digital_skb_alloc(ddev
, size
);
201 skb_put(skb
, sizeof(struct digital_atr_req
));
203 atr_req
= (struct digital_atr_req
*)skb
->data
;
204 memset(atr_req
, 0, sizeof(struct digital_atr_req
));
206 atr_req
->dir
= DIGITAL_NFC_DEP_FRAME_DIR_OUT
;
207 atr_req
->cmd
= DIGITAL_CMD_ATR_REQ
;
208 if (target
->nfcid2_len
)
209 memcpy(atr_req
->nfcid3
, target
->nfcid2
,
210 max(target
->nfcid2_len
, DIGITAL_NFCID3_LEN
));
212 get_random_bytes(atr_req
->nfcid3
, DIGITAL_NFCID3_LEN
);
218 atr_req
->pp
= DIGITAL_LR_BITS_PAYLOAD_SIZE_254B
;
221 atr_req
->pp
|= DIGITAL_GB_BIT
;
222 memcpy(skb_put(skb
, gb_len
), gb
, gb_len
);
225 digital_skb_push_dep_sod(ddev
, skb
);
227 ddev
->skb_add_crc(skb
);
229 digital_in_send_cmd(ddev
, skb
, 500, digital_in_recv_atr_res
, target
);
234 static int digital_in_send_rtox(struct nfc_digital_dev
*ddev
,
235 struct digital_data_exch
*data_exch
, u8 rtox
)
237 struct digital_dep_req_res
*dep_req
;
241 skb
= digital_skb_alloc(ddev
, 1);
245 *skb_put(skb
, 1) = rtox
;
247 skb_push(skb
, sizeof(struct digital_dep_req_res
));
249 dep_req
= (struct digital_dep_req_res
*)skb
->data
;
251 dep_req
->dir
= DIGITAL_NFC_DEP_FRAME_DIR_OUT
;
252 dep_req
->cmd
= DIGITAL_CMD_DEP_REQ
;
253 dep_req
->pfb
= DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU
|
254 DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT
;
256 digital_skb_push_dep_sod(ddev
, skb
);
258 ddev
->skb_add_crc(skb
);
260 rc
= digital_in_send_cmd(ddev
, skb
, 1500, digital_in_recv_dep_res
,
266 static void digital_in_recv_dep_res(struct nfc_digital_dev
*ddev
, void *arg
,
267 struct sk_buff
*resp
)
269 struct digital_data_exch
*data_exch
= arg
;
270 struct digital_dep_req_res
*dep_res
;
281 rc
= ddev
->skb_check_crc(resp
);
283 PROTOCOL_ERR("14.4.1.6");
287 rc
= digital_skb_pull_dep_sod(ddev
, resp
);
289 PROTOCOL_ERR("14.4.1.2");
293 dep_res
= (struct digital_dep_req_res
*)resp
->data
;
295 if (resp
->len
< sizeof(struct digital_dep_req_res
) ||
296 dep_res
->dir
!= DIGITAL_NFC_DEP_FRAME_DIR_IN
||
297 dep_res
->cmd
!= DIGITAL_CMD_DEP_RES
) {
304 switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb
)) {
305 case DIGITAL_NFC_DEP_PFB_I_PDU
:
306 if (DIGITAL_NFC_DEP_PFB_PNI(pfb
) != ddev
->curr_nfc_dep_pni
) {
307 PROTOCOL_ERR("14.12.3.3");
312 ddev
->curr_nfc_dep_pni
=
313 DIGITAL_NFC_DEP_PFB_PNI(ddev
->curr_nfc_dep_pni
+ 1);
317 case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU
:
318 pr_err("Received a ACK/NACK PDU\n");
322 case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU
:
323 if (!DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb
)) {
328 rc
= digital_in_send_rtox(ddev
, data_exch
, resp
->data
[3]);
336 if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb
)) {
337 pr_err("MI bit set. Chained PDU not supported\n");
342 size
= sizeof(struct digital_dep_req_res
);
344 if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb
))
347 if (size
> resp
->len
) {
352 skb_pull(resp
, size
);
355 data_exch
->cb(data_exch
->cb_context
, resp
, rc
);
364 int digital_in_send_dep_req(struct nfc_digital_dev
*ddev
,
365 struct nfc_target
*target
, struct sk_buff
*skb
,
366 struct digital_data_exch
*data_exch
)
368 struct digital_dep_req_res
*dep_req
;
370 skb_push(skb
, sizeof(struct digital_dep_req_res
));
372 dep_req
= (struct digital_dep_req_res
*)skb
->data
;
373 dep_req
->dir
= DIGITAL_NFC_DEP_FRAME_DIR_OUT
;
374 dep_req
->cmd
= DIGITAL_CMD_DEP_REQ
;
375 dep_req
->pfb
= ddev
->curr_nfc_dep_pni
;
377 digital_skb_push_dep_sod(ddev
, skb
);
379 ddev
->skb_add_crc(skb
);
381 return digital_in_send_cmd(ddev
, skb
, 1500, digital_in_recv_dep_res
,
385 static void digital_tg_recv_dep_req(struct nfc_digital_dev
*ddev
, void *arg
,
386 struct sk_buff
*resp
)
389 struct digital_dep_req_res
*dep_req
;
398 rc
= ddev
->skb_check_crc(resp
);
400 PROTOCOL_ERR("14.4.1.6");
404 rc
= digital_skb_pull_dep_sod(ddev
, resp
);
406 PROTOCOL_ERR("14.4.1.2");
410 size
= sizeof(struct digital_dep_req_res
);
411 dep_req
= (struct digital_dep_req_res
*)resp
->data
;
413 if (resp
->len
< size
|| dep_req
->dir
!= DIGITAL_NFC_DEP_FRAME_DIR_OUT
||
414 dep_req
->cmd
!= DIGITAL_CMD_DEP_REQ
) {
419 if (DIGITAL_NFC_DEP_DID_BIT_SET(dep_req
->pfb
))
422 if (resp
->len
< size
) {
427 switch (DIGITAL_NFC_DEP_PFB_TYPE(dep_req
->pfb
)) {
428 case DIGITAL_NFC_DEP_PFB_I_PDU
:
429 pr_debug("DIGITAL_NFC_DEP_PFB_I_PDU\n");
430 ddev
->curr_nfc_dep_pni
= DIGITAL_NFC_DEP_PFB_PNI(dep_req
->pfb
);
432 case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU
:
433 pr_err("Received a ACK/NACK PDU\n");
437 case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU
:
438 pr_err("Received a SUPERVISOR PDU\n");
444 skb_pull(resp
, size
);
446 rc
= nfc_tm_data_received(ddev
->nfc_dev
, resp
);
453 int digital_tg_send_dep_res(struct nfc_digital_dev
*ddev
, struct sk_buff
*skb
)
455 struct digital_dep_req_res
*dep_res
;
457 skb_push(skb
, sizeof(struct digital_dep_req_res
));
458 dep_res
= (struct digital_dep_req_res
*)skb
->data
;
460 dep_res
->dir
= DIGITAL_NFC_DEP_FRAME_DIR_IN
;
461 dep_res
->cmd
= DIGITAL_CMD_DEP_RES
;
462 dep_res
->pfb
= ddev
->curr_nfc_dep_pni
;
464 digital_skb_push_dep_sod(ddev
, skb
);
466 ddev
->skb_add_crc(skb
);
468 return digital_tg_send_cmd(ddev
, skb
, 1500, digital_tg_recv_dep_req
,
472 static void digital_tg_send_psl_res_complete(struct nfc_digital_dev
*ddev
,
473 void *arg
, struct sk_buff
*resp
)
475 u8 rf_tech
= PTR_ERR(arg
);
480 digital_tg_configure_hw(ddev
, NFC_DIGITAL_CONFIG_RF_TECH
, rf_tech
);
482 digital_tg_listen(ddev
, 1500, digital_tg_recv_dep_req
, NULL
);
487 static int digital_tg_send_psl_res(struct nfc_digital_dev
*ddev
, u8 did
,
490 struct digital_psl_res
*psl_res
;
494 skb
= digital_skb_alloc(ddev
, sizeof(struct digital_psl_res
));
498 skb_put(skb
, sizeof(struct digital_psl_res
));
500 psl_res
= (struct digital_psl_res
*)skb
->data
;
502 psl_res
->dir
= DIGITAL_NFC_DEP_FRAME_DIR_IN
;
503 psl_res
->cmd
= DIGITAL_CMD_PSL_RES
;
506 digital_skb_push_dep_sod(ddev
, skb
);
508 ddev
->skb_add_crc(skb
);
510 rc
= digital_tg_send_cmd(ddev
, skb
, 0, digital_tg_send_psl_res_complete
,
519 static void digital_tg_recv_psl_req(struct nfc_digital_dev
*ddev
, void *arg
,
520 struct sk_buff
*resp
)
523 struct digital_psl_req
*psl_req
;
533 rc
= ddev
->skb_check_crc(resp
);
535 PROTOCOL_ERR("14.4.1.6");
539 rc
= digital_skb_pull_dep_sod(ddev
, resp
);
541 PROTOCOL_ERR("14.4.1.2");
545 psl_req
= (struct digital_psl_req
*)resp
->data
;
547 if (resp
->len
!= sizeof(struct digital_psl_req
) ||
548 psl_req
->dir
!= DIGITAL_NFC_DEP_FRAME_DIR_OUT
||
549 psl_req
->cmd
!= DIGITAL_CMD_PSL_REQ
) {
554 dsi
= (psl_req
->brs
>> 3) & 0x07;
557 rf_tech
= NFC_DIGITAL_RF_TECH_106A
;
560 rf_tech
= NFC_DIGITAL_RF_TECH_212F
;
563 rf_tech
= NFC_DIGITAL_RF_TECH_424F
;
566 pr_err("Unsuported dsi value %d\n", dsi
);
570 rc
= digital_tg_send_psl_res(ddev
, psl_req
->did
, rf_tech
);
576 static void digital_tg_send_atr_res_complete(struct nfc_digital_dev
*ddev
,
577 void *arg
, struct sk_buff
*resp
)
582 digital_poll_next_tech(ddev
);
587 if (resp
->data
[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB
)
590 if (resp
->data
[offset
] == DIGITAL_CMD_PSL_REQ
)
591 digital_tg_recv_psl_req(ddev
, arg
, resp
);
593 digital_tg_recv_dep_req(ddev
, arg
, resp
);
596 static int digital_tg_send_atr_res(struct nfc_digital_dev
*ddev
,
597 struct digital_atr_req
*atr_req
)
599 struct digital_atr_res
*atr_res
;
605 gb
= nfc_get_local_general_bytes(ddev
->nfc_dev
, &gb_len
);
609 skb
= digital_skb_alloc(ddev
, sizeof(struct digital_atr_res
) + gb_len
);
613 skb_put(skb
, sizeof(struct digital_atr_res
));
614 atr_res
= (struct digital_atr_res
*)skb
->data
;
616 memset(atr_res
, 0, sizeof(struct digital_atr_res
));
618 atr_res
->dir
= DIGITAL_NFC_DEP_FRAME_DIR_IN
;
619 atr_res
->cmd
= DIGITAL_CMD_ATR_RES
;
620 memcpy(atr_res
->nfcid3
, atr_req
->nfcid3
, sizeof(atr_req
->nfcid3
));
622 atr_res
->pp
= DIGITAL_LR_BITS_PAYLOAD_SIZE_254B
;
624 skb_put(skb
, gb_len
);
626 atr_res
->pp
|= DIGITAL_GB_BIT
;
627 memcpy(atr_res
->gb
, gb
, gb_len
);
630 digital_skb_push_dep_sod(ddev
, skb
);
632 ddev
->skb_add_crc(skb
);
634 rc
= digital_tg_send_cmd(ddev
, skb
, 999,
635 digital_tg_send_atr_res_complete
, NULL
);
644 void digital_tg_recv_atr_req(struct nfc_digital_dev
*ddev
, void *arg
,
645 struct sk_buff
*resp
)
648 struct digital_atr_req
*atr_req
;
649 size_t gb_len
, min_size
;
662 if (resp
->data
[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB
) {
663 min_size
= DIGITAL_ATR_REQ_MIN_SIZE
+ 2;
665 ddev
->curr_rf_tech
= NFC_DIGITAL_RF_TECH_106A
;
666 ddev
->skb_add_crc
= digital_skb_add_crc_a
;
667 ddev
->skb_check_crc
= digital_skb_check_crc_a
;
669 min_size
= DIGITAL_ATR_REQ_MIN_SIZE
+ 1;
671 ddev
->curr_rf_tech
= NFC_DIGITAL_RF_TECH_212F
;
672 ddev
->skb_add_crc
= digital_skb_add_crc_f
;
673 ddev
->skb_check_crc
= digital_skb_check_crc_f
;
676 if (resp
->len
< min_size
) {
681 if (DIGITAL_DRV_CAPS_TG_CRC(ddev
)) {
682 ddev
->skb_add_crc
= digital_skb_add_crc_none
;
683 ddev
->skb_check_crc
= digital_skb_check_crc_none
;
686 rc
= ddev
->skb_check_crc(resp
);
688 PROTOCOL_ERR("14.4.1.6");
692 rc
= digital_skb_pull_dep_sod(ddev
, resp
);
694 PROTOCOL_ERR("14.4.1.2");
698 atr_req
= (struct digital_atr_req
*)resp
->data
;
700 if (atr_req
->dir
!= DIGITAL_NFC_DEP_FRAME_DIR_OUT
||
701 atr_req
->cmd
!= DIGITAL_CMD_ATR_REQ
) {
706 rc
= digital_tg_configure_hw(ddev
, NFC_DIGITAL_CONFIG_FRAMING
,
707 NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED
);
711 rc
= digital_tg_send_atr_res(ddev
, atr_req
);
715 gb_len
= resp
->len
- sizeof(struct digital_atr_req
);
716 rc
= nfc_tm_activated(ddev
->nfc_dev
, NFC_PROTO_NFC_DEP_MASK
,
717 NFC_COMM_PASSIVE
, atr_req
->gb
, gb_len
);
721 ddev
->poll_tech_count
= 0;
726 digital_poll_next_tech(ddev
);