1 // SPDX-License-Identifier: GPL-2.0-only
3 * NFC Digital Protocol stack
4 * Copyright (c) 2013, Intel Corporation.
7 #define pr_fmt(fmt) "digital: %s: " fmt, __func__
11 #define DIGITAL_NFC_DEP_N_RETRY_NACK 2
12 #define DIGITAL_NFC_DEP_N_RETRY_ATN 2
14 #define DIGITAL_NFC_DEP_FRAME_DIR_OUT 0xD4
15 #define DIGITAL_NFC_DEP_FRAME_DIR_IN 0xD5
17 #define DIGITAL_NFC_DEP_NFCA_SOD_SB 0xF0
19 #define DIGITAL_CMD_ATR_REQ 0x00
20 #define DIGITAL_CMD_ATR_RES 0x01
21 #define DIGITAL_CMD_PSL_REQ 0x04
22 #define DIGITAL_CMD_PSL_RES 0x05
23 #define DIGITAL_CMD_DEP_REQ 0x06
24 #define DIGITAL_CMD_DEP_RES 0x07
26 #define DIGITAL_ATR_REQ_MIN_SIZE 16
27 #define DIGITAL_ATR_REQ_MAX_SIZE 64
29 #define DIGITAL_ATR_RES_TO_WT(s) ((s) & 0xF)
31 #define DIGITAL_DID_MAX 14
33 #define DIGITAL_PAYLOAD_SIZE_MAX 254
34 #define DIGITAL_PAYLOAD_BITS_TO_PP(s) (((s) & 0x3) << 4)
35 #define DIGITAL_PAYLOAD_PP_TO_BITS(s) (((s) >> 4) & 0x3)
36 #define DIGITAL_PAYLOAD_BITS_TO_FSL(s) ((s) & 0x3)
37 #define DIGITAL_PAYLOAD_FSL_TO_BITS(s) ((s) & 0x3)
39 #define DIGITAL_GB_BIT 0x02
41 #define DIGITAL_NFC_DEP_REQ_RES_HEADROOM 2 /* SoD: [SB (NFC-A)] + LEN */
42 #define DIGITAL_NFC_DEP_REQ_RES_TAILROOM 2 /* EoD: 2-byte CRC */
44 #define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0)
46 #define DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT 0x10
47 #define DIGITAL_NFC_DEP_PFB_MI_BIT 0x10
48 #define DIGITAL_NFC_DEP_PFB_NACK_BIT 0x10
49 #define DIGITAL_NFC_DEP_PFB_DID_BIT 0x04
51 #define DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
52 ((pfb) & DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT)
53 #define DIGITAL_NFC_DEP_MI_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_MI_BIT)
54 #define DIGITAL_NFC_DEP_NACK_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_NACK_BIT)
55 #define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08)
56 #define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_DID_BIT)
57 #define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03)
59 #define DIGITAL_NFC_DEP_RTOX_VALUE(data) ((data) & 0x3F)
60 #define DIGITAL_NFC_DEP_RTOX_MAX 59
62 #define DIGITAL_NFC_DEP_PFB_I_PDU 0x00
63 #define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40
64 #define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80
66 struct digital_atr_req {
77 struct digital_atr_res {
89 struct digital_psl_req {
97 struct digital_psl_res {
103 struct digital_dep_req_res {
109 static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg,
110 struct sk_buff *resp);
111 static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg,
112 struct sk_buff *resp);
114 static const u8 digital_payload_bits_map[4] = {
121 /* Response Waiting Time for ATR_RES PDU in ms
123 * RWT(ATR_RES) = RWT(nfcdep,activation) + dRWT(nfcdep) + dT(nfcdep,initiator)
126 * RWT(nfcdep,activation) = 4096 * 2^12 / f(c) s
127 * dRWT(nfcdep) = 16 / f(c) s
128 * dT(nfcdep,initiator) = 100 ms
131 #define DIGITAL_ATR_RES_RWT 1337
133 /* Response Waiting Time for other DEP PDUs in ms
135 * max_rwt = rwt + dRWT(nfcdep) + dT(nfcdep,initiator)
138 * rwt = (256 * 16 / f(c)) * 2^wt s
139 * dRWT(nfcdep) = 16 / f(c) s
140 * dT(nfcdep,initiator) = 100 ms
142 * 0 <= wt <= 14 (given by the target by the TO field of ATR_RES response)
144 #define DIGITAL_NFC_DEP_IN_MAX_WT 14
145 #define DIGITAL_NFC_DEP_TG_MAX_WT 14
146 static const u16 digital_rwt_map[DIGITAL_NFC_DEP_IN_MAX_WT + 1] = {
147 100, 101, 101, 102, 105,
148 110, 119, 139, 177, 255,
149 409, 719, 1337, 2575, 5049,
152 static u8 digital_payload_bits_to_size(u8 payload_bits)
154 if (payload_bits >= ARRAY_SIZE(digital_payload_bits_map))
157 return digital_payload_bits_map[payload_bits];
160 static u8 digital_payload_size_to_bits(u8 payload_size)
164 for (i = 0; i < ARRAY_SIZE(digital_payload_bits_map); i++)
165 if (digital_payload_bits_map[i] == payload_size)
171 static void digital_skb_push_dep_sod(struct nfc_digital_dev *ddev,
174 skb_push(skb, sizeof(u8));
176 skb->data[0] = skb->len;
178 if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)
179 *(u8 *)skb_push(skb, sizeof(u8)) = DIGITAL_NFC_DEP_NFCA_SOD_SB;
182 static int digital_skb_pull_dep_sod(struct nfc_digital_dev *ddev,
190 if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)
191 skb_pull(skb, sizeof(u8));
194 if (size != skb->len)
197 skb_pull(skb, sizeof(u8));
202 static struct sk_buff *
203 digital_send_dep_data_prep(struct nfc_digital_dev *ddev, struct sk_buff *skb,
204 struct digital_dep_req_res *dep_req_res,
205 struct digital_data_exch *data_exch)
207 struct sk_buff *new_skb;
209 if (skb->len > ddev->remote_payload_max) {
210 dep_req_res->pfb |= DIGITAL_NFC_DEP_PFB_MI_BIT;
212 new_skb = digital_skb_alloc(ddev, ddev->remote_payload_max);
214 kfree_skb(ddev->chaining_skb);
215 ddev->chaining_skb = NULL;
217 return ERR_PTR(-ENOMEM);
220 skb_put_data(new_skb, skb->data, ddev->remote_payload_max);
221 skb_pull(skb, ddev->remote_payload_max);
223 ddev->chaining_skb = skb;
224 ddev->data_exch = data_exch;
226 ddev->chaining_skb = NULL;
233 static struct sk_buff *
234 digital_recv_dep_data_gather(struct nfc_digital_dev *ddev, u8 pfb,
235 struct sk_buff *resp,
236 int (*send_ack)(struct nfc_digital_dev *ddev,
237 struct digital_data_exch
239 struct digital_data_exch *data_exch)
241 struct sk_buff *new_skb;
244 if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb) && (!ddev->chaining_skb)) {
246 nfc_alloc_recv_skb(8 * ddev->local_payload_max,
248 if (!ddev->chaining_skb) {
254 if (ddev->chaining_skb) {
255 if (resp->len > skb_tailroom(ddev->chaining_skb)) {
256 new_skb = skb_copy_expand(ddev->chaining_skb,
259 8 * ddev->local_payload_max,
266 kfree_skb(ddev->chaining_skb);
267 ddev->chaining_skb = new_skb;
270 skb_put_data(ddev->chaining_skb, resp->data, resp->len);
275 if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb)) {
276 rc = send_ack(ddev, data_exch);
283 resp = ddev->chaining_skb;
284 ddev->chaining_skb = NULL;
292 kfree_skb(ddev->chaining_skb);
293 ddev->chaining_skb = NULL;
298 static void digital_in_recv_psl_res(struct nfc_digital_dev *ddev, void *arg,
299 struct sk_buff *resp)
301 struct nfc_target *target = arg;
302 struct digital_psl_res *psl_res;
311 rc = ddev->skb_check_crc(resp);
313 PROTOCOL_ERR("14.4.1.6");
317 rc = digital_skb_pull_dep_sod(ddev, resp);
319 PROTOCOL_ERR("14.4.1.2");
323 psl_res = (struct digital_psl_res *)resp->data;
325 if ((resp->len != sizeof(*psl_res)) ||
326 (psl_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN) ||
327 (psl_res->cmd != DIGITAL_CMD_PSL_RES)) {
332 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
333 NFC_DIGITAL_RF_TECH_424F);
337 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
338 NFC_DIGITAL_FRAMING_NFCF_NFC_DEP);
342 if (!DIGITAL_DRV_CAPS_IN_CRC(ddev) &&
343 (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)) {
344 ddev->skb_add_crc = digital_skb_add_crc_f;
345 ddev->skb_check_crc = digital_skb_check_crc_f;
348 ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_424F;
350 nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE,
353 ddev->curr_nfc_dep_pni = 0;
359 ddev->curr_protocol = 0;
362 static int digital_in_send_psl_req(struct nfc_digital_dev *ddev,
363 struct nfc_target *target)
366 struct digital_psl_req *psl_req;
368 u8 payload_size, payload_bits;
370 skb = digital_skb_alloc(ddev, sizeof(*psl_req));
374 skb_put(skb, sizeof(*psl_req));
376 psl_req = (struct digital_psl_req *)skb->data;
378 psl_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
379 psl_req->cmd = DIGITAL_CMD_PSL_REQ;
381 psl_req->brs = (0x2 << 3) | 0x2; /* 424F both directions */
383 payload_size = min(ddev->local_payload_max, ddev->remote_payload_max);
384 payload_bits = digital_payload_size_to_bits(payload_size);
385 psl_req->fsl = DIGITAL_PAYLOAD_BITS_TO_FSL(payload_bits);
387 ddev->local_payload_max = payload_size;
388 ddev->remote_payload_max = payload_size;
390 digital_skb_push_dep_sod(ddev, skb);
392 ddev->skb_add_crc(skb);
394 rc = digital_in_send_cmd(ddev, skb, ddev->dep_rwt,
395 digital_in_recv_psl_res, target);
402 static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg,
403 struct sk_buff *resp)
405 struct nfc_target *target = arg;
406 struct digital_atr_res *atr_res;
407 u8 gb_len, payload_bits;
417 rc = ddev->skb_check_crc(resp);
419 PROTOCOL_ERR("14.4.1.6");
423 rc = digital_skb_pull_dep_sod(ddev, resp);
425 PROTOCOL_ERR("14.4.1.2");
429 if (resp->len < sizeof(struct digital_atr_res)) {
434 gb_len = resp->len - sizeof(struct digital_atr_res);
436 atr_res = (struct digital_atr_res *)resp->data;
438 wt = DIGITAL_ATR_RES_TO_WT(atr_res->to);
439 if (wt > DIGITAL_NFC_DEP_IN_MAX_WT)
440 wt = DIGITAL_NFC_DEP_IN_MAX_WT;
441 ddev->dep_rwt = digital_rwt_map[wt];
443 payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_res->pp);
444 ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits);
446 if (!ddev->remote_payload_max) {
451 rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len);
455 if ((ddev->protocols & NFC_PROTO_FELICA_MASK) &&
456 (ddev->curr_rf_tech != NFC_DIGITAL_RF_TECH_424F)) {
457 rc = digital_in_send_psl_req(ddev, target);
462 rc = nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE,
465 ddev->curr_nfc_dep_pni = 0;
471 ddev->curr_protocol = 0;
474 int digital_in_send_atr_req(struct nfc_digital_dev *ddev,
475 struct nfc_target *target, __u8 comm_mode, __u8 *gb,
479 struct digital_atr_req *atr_req;
484 size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len;
486 if (size > DIGITAL_ATR_REQ_MAX_SIZE) {
487 PROTOCOL_ERR("14.6.1.1");
491 skb = digital_skb_alloc(ddev, size);
495 skb_put(skb, sizeof(struct digital_atr_req));
497 atr_req = (struct digital_atr_req *)skb->data;
498 memset(atr_req, 0, sizeof(struct digital_atr_req));
500 atr_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
501 atr_req->cmd = DIGITAL_CMD_ATR_REQ;
502 if (target->nfcid2_len)
503 memcpy(atr_req->nfcid3, target->nfcid2, NFC_NFCID2_MAXSIZE);
505 get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE);
511 ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX;
512 payload_bits = digital_payload_size_to_bits(ddev->local_payload_max);
513 atr_req->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits);
516 atr_req->pp |= DIGITAL_GB_BIT;
517 skb_put_data(skb, gb, gb_len);
520 digital_skb_push_dep_sod(ddev, skb);
522 ddev->skb_add_crc(skb);
524 rc = digital_in_send_cmd(ddev, skb, DIGITAL_ATR_RES_RWT,
525 digital_in_recv_atr_res, target);
532 static int digital_in_send_ack(struct nfc_digital_dev *ddev,
533 struct digital_data_exch *data_exch)
535 struct digital_dep_req_res *dep_req;
539 skb = digital_skb_alloc(ddev, 1);
543 skb_push(skb, sizeof(struct digital_dep_req_res));
545 dep_req = (struct digital_dep_req_res *)skb->data;
547 dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
548 dep_req->cmd = DIGITAL_CMD_DEP_REQ;
549 dep_req->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU |
550 ddev->curr_nfc_dep_pni;
552 digital_skb_push_dep_sod(ddev, skb);
554 ddev->skb_add_crc(skb);
556 ddev->saved_skb = pskb_copy(skb, GFP_KERNEL);
558 rc = digital_in_send_cmd(ddev, skb, ddev->dep_rwt,
559 digital_in_recv_dep_res, data_exch);
562 kfree_skb(ddev->saved_skb);
563 ddev->saved_skb = NULL;
569 static int digital_in_send_nack(struct nfc_digital_dev *ddev,
570 struct digital_data_exch *data_exch)
572 struct digital_dep_req_res *dep_req;
576 skb = digital_skb_alloc(ddev, 1);
580 skb_push(skb, sizeof(struct digital_dep_req_res));
582 dep_req = (struct digital_dep_req_res *)skb->data;
584 dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
585 dep_req->cmd = DIGITAL_CMD_DEP_REQ;
586 dep_req->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU |
587 DIGITAL_NFC_DEP_PFB_NACK_BIT | ddev->curr_nfc_dep_pni;
589 digital_skb_push_dep_sod(ddev, skb);
591 ddev->skb_add_crc(skb);
593 rc = digital_in_send_cmd(ddev, skb, ddev->dep_rwt,
594 digital_in_recv_dep_res, data_exch);
601 static int digital_in_send_atn(struct nfc_digital_dev *ddev,
602 struct digital_data_exch *data_exch)
604 struct digital_dep_req_res *dep_req;
608 skb = digital_skb_alloc(ddev, 1);
612 skb_push(skb, sizeof(struct digital_dep_req_res));
614 dep_req = (struct digital_dep_req_res *)skb->data;
616 dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
617 dep_req->cmd = DIGITAL_CMD_DEP_REQ;
618 dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU;
620 digital_skb_push_dep_sod(ddev, skb);
622 ddev->skb_add_crc(skb);
624 rc = digital_in_send_cmd(ddev, skb, ddev->dep_rwt,
625 digital_in_recv_dep_res, data_exch);
632 static int digital_in_send_rtox(struct nfc_digital_dev *ddev,
633 struct digital_data_exch *data_exch, u8 rtox)
635 struct digital_dep_req_res *dep_req;
640 rwt_int = ddev->dep_rwt * rtox;
641 if (rwt_int > digital_rwt_map[DIGITAL_NFC_DEP_IN_MAX_WT])
642 rwt_int = digital_rwt_map[DIGITAL_NFC_DEP_IN_MAX_WT];
644 skb = digital_skb_alloc(ddev, 1);
648 skb_put_u8(skb, rtox);
650 skb_push(skb, sizeof(struct digital_dep_req_res));
652 dep_req = (struct digital_dep_req_res *)skb->data;
654 dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
655 dep_req->cmd = DIGITAL_CMD_DEP_REQ;
656 dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU |
657 DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT;
659 digital_skb_push_dep_sod(ddev, skb);
661 ddev->skb_add_crc(skb);
663 rc = digital_in_send_cmd(ddev, skb, rwt_int,
664 digital_in_recv_dep_res, data_exch);
671 static int digital_in_send_saved_skb(struct nfc_digital_dev *ddev,
672 struct digital_data_exch *data_exch)
676 if (!ddev->saved_skb)
679 skb_get(ddev->saved_skb);
681 rc = digital_in_send_cmd(ddev, ddev->saved_skb, ddev->dep_rwt,
682 digital_in_recv_dep_res, data_exch);
684 kfree_skb(ddev->saved_skb);
689 static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg,
690 struct sk_buff *resp)
692 struct digital_data_exch *data_exch = arg;
693 struct digital_dep_req_res *dep_res;
703 if ((rc == -EIO || (rc == -ETIMEDOUT && ddev->nack_count)) &&
704 (ddev->nack_count++ < DIGITAL_NFC_DEP_N_RETRY_NACK)) {
707 rc = digital_in_send_nack(ddev, data_exch);
712 } else if ((rc == -ETIMEDOUT) &&
713 (ddev->atn_count++ < DIGITAL_NFC_DEP_N_RETRY_ATN)) {
714 ddev->nack_count = 0;
716 rc = digital_in_send_atn(ddev, data_exch);
726 rc = digital_skb_pull_dep_sod(ddev, resp);
728 PROTOCOL_ERR("14.4.1.2");
732 rc = ddev->skb_check_crc(resp);
734 if ((resp->len >= 4) &&
735 (ddev->nack_count++ < DIGITAL_NFC_DEP_N_RETRY_NACK)) {
738 rc = digital_in_send_nack(ddev, data_exch);
747 PROTOCOL_ERR("14.4.1.6");
752 ddev->nack_count = 0;
754 if (resp->len > ddev->local_payload_max) {
759 size = sizeof(struct digital_dep_req_res);
760 dep_res = (struct digital_dep_req_res *)resp->data;
762 if (resp->len < size || dep_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN ||
763 dep_res->cmd != DIGITAL_CMD_DEP_RES) {
770 if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) {
771 PROTOCOL_ERR("14.8.2.1");
776 if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) {
781 if (size > resp->len) {
786 skb_pull(resp, size);
788 switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) {
789 case DIGITAL_NFC_DEP_PFB_I_PDU:
790 if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) {
791 PROTOCOL_ERR("14.12.3.3");
796 ddev->curr_nfc_dep_pni =
797 DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1);
799 kfree_skb(ddev->saved_skb);
800 ddev->saved_skb = NULL;
802 resp = digital_recv_dep_data_gather(ddev, pfb, resp,
811 /* If resp is NULL then we're still chaining so return and
812 * wait for the next part of the PDU. Else, the PDU is
813 * complete so pass it up.
821 case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU:
822 if (DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) {
823 PROTOCOL_ERR("14.12.4.5");
828 if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) {
829 PROTOCOL_ERR("14.12.3.3");
834 ddev->curr_nfc_dep_pni =
835 DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1);
837 if (!ddev->chaining_skb) {
838 PROTOCOL_ERR("14.12.4.3");
843 /* The initiator has received a valid ACK. Free the last sent
844 * PDU and keep on sending chained skb.
846 kfree_skb(ddev->saved_skb);
847 ddev->saved_skb = NULL;
849 rc = digital_in_send_dep_req(ddev, NULL,
857 case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU:
858 if (!DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { /* ATN */
859 rc = digital_in_send_saved_skb(ddev, data_exch);
866 if (ddev->atn_count || ddev->nack_count) {
867 PROTOCOL_ERR("14.12.4.4");
872 rtox = DIGITAL_NFC_DEP_RTOX_VALUE(resp->data[0]);
873 if (!rtox || rtox > DIGITAL_NFC_DEP_RTOX_MAX) {
874 PROTOCOL_ERR("14.8.4.1");
879 rc = digital_in_send_rtox(ddev, data_exch, rtox);
887 data_exch->cb(data_exch->cb_context, resp, rc);
892 kfree_skb(ddev->chaining_skb);
893 ddev->chaining_skb = NULL;
895 kfree_skb(ddev->saved_skb);
896 ddev->saved_skb = NULL;
907 int digital_in_send_dep_req(struct nfc_digital_dev *ddev,
908 struct nfc_target *target, struct sk_buff *skb,
909 struct digital_data_exch *data_exch)
911 struct digital_dep_req_res *dep_req;
912 struct sk_buff *chaining_skb, *tmp_skb;
915 skb_push(skb, sizeof(struct digital_dep_req_res));
917 dep_req = (struct digital_dep_req_res *)skb->data;
919 dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
920 dep_req->cmd = DIGITAL_CMD_DEP_REQ;
921 dep_req->pfb = ddev->curr_nfc_dep_pni;
924 ddev->nack_count = 0;
926 chaining_skb = ddev->chaining_skb;
928 tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_req, data_exch);
930 return PTR_ERR(tmp_skb);
932 digital_skb_push_dep_sod(ddev, tmp_skb);
934 ddev->skb_add_crc(tmp_skb);
936 ddev->saved_skb = pskb_copy(tmp_skb, GFP_KERNEL);
938 rc = digital_in_send_cmd(ddev, tmp_skb, ddev->dep_rwt,
939 digital_in_recv_dep_res, data_exch);
944 kfree_skb(chaining_skb);
945 ddev->chaining_skb = NULL;
947 kfree_skb(ddev->saved_skb);
948 ddev->saved_skb = NULL;
954 static void digital_tg_set_rf_tech(struct nfc_digital_dev *ddev, u8 rf_tech)
956 ddev->curr_rf_tech = rf_tech;
958 ddev->skb_add_crc = digital_skb_add_crc_none;
959 ddev->skb_check_crc = digital_skb_check_crc_none;
961 if (DIGITAL_DRV_CAPS_TG_CRC(ddev))
964 switch (ddev->curr_rf_tech) {
965 case NFC_DIGITAL_RF_TECH_106A:
966 ddev->skb_add_crc = digital_skb_add_crc_a;
967 ddev->skb_check_crc = digital_skb_check_crc_a;
970 case NFC_DIGITAL_RF_TECH_212F:
971 case NFC_DIGITAL_RF_TECH_424F:
972 ddev->skb_add_crc = digital_skb_add_crc_f;
973 ddev->skb_check_crc = digital_skb_check_crc_f;
981 static int digital_tg_send_ack(struct nfc_digital_dev *ddev,
982 struct digital_data_exch *data_exch)
984 struct digital_dep_req_res *dep_res;
988 skb = digital_skb_alloc(ddev, 1);
992 skb_push(skb, sizeof(struct digital_dep_req_res));
994 dep_res = (struct digital_dep_req_res *)skb->data;
996 dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN;
997 dep_res->cmd = DIGITAL_CMD_DEP_RES;
998 dep_res->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU |
999 ddev->curr_nfc_dep_pni;
1002 dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT;
1004 skb_put_data(skb, &ddev->did, sizeof(ddev->did));
1007 ddev->curr_nfc_dep_pni =
1008 DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1);
1010 digital_skb_push_dep_sod(ddev, skb);
1012 ddev->skb_add_crc(skb);
1014 ddev->saved_skb = pskb_copy(skb, GFP_KERNEL);
1016 rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req,
1020 kfree_skb(ddev->saved_skb);
1021 ddev->saved_skb = NULL;
1027 static int digital_tg_send_atn(struct nfc_digital_dev *ddev)
1029 struct digital_dep_req_res *dep_res;
1030 struct sk_buff *skb;
1033 skb = digital_skb_alloc(ddev, 1);
1037 skb_push(skb, sizeof(struct digital_dep_req_res));
1039 dep_res = (struct digital_dep_req_res *)skb->data;
1041 dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN;
1042 dep_res->cmd = DIGITAL_CMD_DEP_RES;
1043 dep_res->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU;
1046 dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT;
1048 skb_put_data(skb, &ddev->did, sizeof(ddev->did));
1051 digital_skb_push_dep_sod(ddev, skb);
1053 ddev->skb_add_crc(skb);
1055 rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req,
1063 static int digital_tg_send_saved_skb(struct nfc_digital_dev *ddev)
1067 if (!ddev->saved_skb)
1070 skb_get(ddev->saved_skb);
1072 rc = digital_tg_send_cmd(ddev, ddev->saved_skb, 1500,
1073 digital_tg_recv_dep_req, NULL);
1075 kfree_skb(ddev->saved_skb);
1080 static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg,
1081 struct sk_buff *resp)
1084 struct digital_dep_req_res *dep_req;
1094 rc = ddev->skb_check_crc(resp);
1096 PROTOCOL_ERR("14.4.1.6");
1100 rc = digital_skb_pull_dep_sod(ddev, resp);
1102 PROTOCOL_ERR("14.4.1.2");
1106 if (resp->len > ddev->local_payload_max) {
1111 size = sizeof(struct digital_dep_req_res);
1112 dep_req = (struct digital_dep_req_res *)resp->data;
1114 if (resp->len < size || dep_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT ||
1115 dep_req->cmd != DIGITAL_CMD_DEP_REQ) {
1122 if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) {
1123 if (ddev->did && (ddev->did == resp->data[3])) {
1129 } else if (ddev->did) {
1134 if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) {
1139 if (size > resp->len) {
1144 skb_pull(resp, size);
1146 switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) {
1147 case DIGITAL_NFC_DEP_PFB_I_PDU:
1148 pr_debug("DIGITAL_NFC_DEP_PFB_I_PDU\n");
1150 if (ddev->atn_count) {
1151 /* The target has received (and replied to) at least one
1154 ddev->atn_count = 0;
1156 /* pni of resp PDU equal to the target current pni - 1
1157 * means resp is the previous DEP_REQ PDU received from
1158 * the initiator so the target replies with saved_skb
1159 * which is the previous DEP_RES saved in
1160 * digital_tg_send_dep_res().
1162 if (DIGITAL_NFC_DEP_PFB_PNI(pfb) ==
1163 DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni - 1)) {
1164 rc = digital_tg_send_saved_skb(ddev);
1171 /* atn_count > 0 and PDU pni != curr_nfc_dep_pni - 1
1172 * means the target probably did not received the last
1173 * DEP_REQ PDU sent by the initiator. The target
1174 * fallbacks to normal processing then.
1178 if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) {
1179 PROTOCOL_ERR("14.12.3.4");
1184 kfree_skb(ddev->saved_skb);
1185 ddev->saved_skb = NULL;
1187 resp = digital_recv_dep_data_gather(ddev, pfb, resp,
1188 digital_tg_send_ack, NULL);
1195 /* If resp is NULL then we're still chaining so return and
1196 * wait for the next part of the PDU. Else, the PDU is
1197 * complete so pass it up.
1204 case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU:
1205 if (DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { /* NACK */
1206 if (DIGITAL_NFC_DEP_PFB_PNI(pfb + 1) !=
1207 ddev->curr_nfc_dep_pni) {
1212 ddev->atn_count = 0;
1214 rc = digital_tg_send_saved_skb(ddev);
1222 if (ddev->atn_count) {
1223 /* The target has previously recevied one or more ATN
1226 ddev->atn_count = 0;
1228 /* If the ACK PNI is equal to the target PNI - 1 means
1229 * that the initiator did not receive the previous PDU
1230 * sent by the target so re-send it.
1232 if (DIGITAL_NFC_DEP_PFB_PNI(pfb + 1) ==
1233 ddev->curr_nfc_dep_pni) {
1234 rc = digital_tg_send_saved_skb(ddev);
1241 /* Otherwise, the target did not receive the previous
1242 * ACK PDU from the initiator. Fallback to normal
1243 * processing of chained PDU then.
1247 /* Keep on sending chained PDU */
1248 if (!ddev->chaining_skb ||
1249 DIGITAL_NFC_DEP_PFB_PNI(pfb) !=
1250 ddev->curr_nfc_dep_pni) {
1255 kfree_skb(ddev->saved_skb);
1256 ddev->saved_skb = NULL;
1258 rc = digital_tg_send_dep_res(ddev, ddev->chaining_skb);
1263 case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU:
1264 if (DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) {
1269 rc = digital_tg_send_atn(ddev);
1278 rc = nfc_tm_data_received(ddev->nfc_dev, resp);
1281 kfree_skb(ddev->chaining_skb);
1282 ddev->chaining_skb = NULL;
1284 ddev->atn_count = 0;
1286 kfree_skb(ddev->saved_skb);
1287 ddev->saved_skb = NULL;
1295 dev_kfree_skb(resp);
1298 int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb)
1300 struct digital_dep_req_res *dep_res;
1301 struct sk_buff *chaining_skb, *tmp_skb;
1304 skb_push(skb, sizeof(struct digital_dep_req_res));
1306 dep_res = (struct digital_dep_req_res *)skb->data;
1308 dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN;
1309 dep_res->cmd = DIGITAL_CMD_DEP_RES;
1310 dep_res->pfb = ddev->curr_nfc_dep_pni;
1313 dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT;
1315 skb_put_data(skb, &ddev->did, sizeof(ddev->did));
1318 ddev->curr_nfc_dep_pni =
1319 DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1);
1321 chaining_skb = ddev->chaining_skb;
1323 tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_res, NULL);
1324 if (IS_ERR(tmp_skb))
1325 return PTR_ERR(tmp_skb);
1327 digital_skb_push_dep_sod(ddev, tmp_skb);
1329 ddev->skb_add_crc(tmp_skb);
1331 ddev->saved_skb = pskb_copy(tmp_skb, GFP_KERNEL);
1333 rc = digital_tg_send_cmd(ddev, tmp_skb, 1500, digital_tg_recv_dep_req,
1339 kfree_skb(chaining_skb);
1340 ddev->chaining_skb = NULL;
1342 kfree_skb(ddev->saved_skb);
1343 ddev->saved_skb = NULL;
1349 static void digital_tg_send_psl_res_complete(struct nfc_digital_dev *ddev,
1350 void *arg, struct sk_buff *resp)
1352 u8 rf_tech = (unsigned long)arg;
1357 digital_tg_set_rf_tech(ddev, rf_tech);
1359 digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);
1361 digital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL);
1363 dev_kfree_skb(resp);
1366 static int digital_tg_send_psl_res(struct nfc_digital_dev *ddev, u8 did,
1369 struct digital_psl_res *psl_res;
1370 struct sk_buff *skb;
1373 skb = digital_skb_alloc(ddev, sizeof(struct digital_psl_res));
1377 skb_put(skb, sizeof(struct digital_psl_res));
1379 psl_res = (struct digital_psl_res *)skb->data;
1381 psl_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN;
1382 psl_res->cmd = DIGITAL_CMD_PSL_RES;
1385 digital_skb_push_dep_sod(ddev, skb);
1387 ddev->skb_add_crc(skb);
1389 ddev->curr_nfc_dep_pni = 0;
1391 rc = digital_tg_send_cmd(ddev, skb, 0, digital_tg_send_psl_res_complete,
1392 (void *)(unsigned long)rf_tech);
1399 static void digital_tg_recv_psl_req(struct nfc_digital_dev *ddev, void *arg,
1400 struct sk_buff *resp)
1403 struct digital_psl_req *psl_req;
1405 u8 dsi, payload_size, payload_bits;
1413 rc = ddev->skb_check_crc(resp);
1415 PROTOCOL_ERR("14.4.1.6");
1419 rc = digital_skb_pull_dep_sod(ddev, resp);
1421 PROTOCOL_ERR("14.4.1.2");
1425 psl_req = (struct digital_psl_req *)resp->data;
1427 if (resp->len != sizeof(struct digital_psl_req) ||
1428 psl_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT ||
1429 psl_req->cmd != DIGITAL_CMD_PSL_REQ) {
1434 dsi = (psl_req->brs >> 3) & 0x07;
1437 rf_tech = NFC_DIGITAL_RF_TECH_106A;
1440 rf_tech = NFC_DIGITAL_RF_TECH_212F;
1443 rf_tech = NFC_DIGITAL_RF_TECH_424F;
1446 pr_err("Unsupported dsi value %d\n", dsi);
1450 payload_bits = DIGITAL_PAYLOAD_FSL_TO_BITS(psl_req->fsl);
1451 payload_size = digital_payload_bits_to_size(payload_bits);
1453 if (!payload_size || (payload_size > min(ddev->local_payload_max,
1454 ddev->remote_payload_max))) {
1459 ddev->local_payload_max = payload_size;
1460 ddev->remote_payload_max = payload_size;
1462 rc = digital_tg_send_psl_res(ddev, psl_req->did, rf_tech);
1468 static void digital_tg_send_atr_res_complete(struct nfc_digital_dev *ddev,
1469 void *arg, struct sk_buff *resp)
1474 digital_poll_next_tech(ddev);
1479 if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB)
1482 ddev->atn_count = 0;
1484 if (resp->data[offset] == DIGITAL_CMD_PSL_REQ)
1485 digital_tg_recv_psl_req(ddev, arg, resp);
1487 digital_tg_recv_dep_req(ddev, arg, resp);
1490 static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev,
1491 struct digital_atr_req *atr_req)
1493 struct digital_atr_res *atr_res;
1494 struct sk_buff *skb;
1495 u8 *gb, payload_bits;
1499 gb = nfc_get_local_general_bytes(ddev->nfc_dev, &gb_len);
1503 skb = digital_skb_alloc(ddev, sizeof(struct digital_atr_res) + gb_len);
1507 skb_put(skb, sizeof(struct digital_atr_res));
1508 atr_res = (struct digital_atr_res *)skb->data;
1510 memset(atr_res, 0, sizeof(struct digital_atr_res));
1512 atr_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN;
1513 atr_res->cmd = DIGITAL_CMD_ATR_RES;
1514 memcpy(atr_res->nfcid3, atr_req->nfcid3, sizeof(atr_req->nfcid3));
1515 atr_res->to = DIGITAL_NFC_DEP_TG_MAX_WT;
1517 ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX;
1518 payload_bits = digital_payload_size_to_bits(ddev->local_payload_max);
1519 atr_res->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits);
1522 skb_put(skb, gb_len);
1524 atr_res->pp |= DIGITAL_GB_BIT;
1525 memcpy(atr_res->gb, gb, gb_len);
1528 digital_skb_push_dep_sod(ddev, skb);
1530 ddev->skb_add_crc(skb);
1532 ddev->curr_nfc_dep_pni = 0;
1534 rc = digital_tg_send_cmd(ddev, skb, 999,
1535 digital_tg_send_atr_res_complete, NULL);
1542 void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg,
1543 struct sk_buff *resp)
1546 struct digital_atr_req *atr_req;
1547 size_t gb_len, min_size;
1548 u8 poll_tech_count, payload_bits;
1561 if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) {
1562 min_size = DIGITAL_ATR_REQ_MIN_SIZE + 2;
1563 digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_106A);
1565 min_size = DIGITAL_ATR_REQ_MIN_SIZE + 1;
1566 digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_212F);
1569 if (resp->len < min_size) {
1574 ddev->curr_protocol = NFC_PROTO_NFC_DEP_MASK;
1576 rc = ddev->skb_check_crc(resp);
1578 PROTOCOL_ERR("14.4.1.6");
1582 rc = digital_skb_pull_dep_sod(ddev, resp);
1584 PROTOCOL_ERR("14.4.1.2");
1588 atr_req = (struct digital_atr_req *)resp->data;
1590 if (atr_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT ||
1591 atr_req->cmd != DIGITAL_CMD_ATR_REQ ||
1592 atr_req->did > DIGITAL_DID_MAX) {
1597 payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_req->pp);
1598 ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits);
1600 if (!ddev->remote_payload_max) {
1605 ddev->did = atr_req->did;
1607 rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1608 NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED);
1612 rc = digital_tg_send_atr_res(ddev, atr_req);
1616 gb_len = resp->len - sizeof(struct digital_atr_req);
1618 poll_tech_count = ddev->poll_tech_count;
1619 ddev->poll_tech_count = 0;
1621 rc = nfc_tm_activated(ddev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1622 NFC_COMM_PASSIVE, atr_req->gb, gb_len);
1624 ddev->poll_tech_count = poll_tech_count;
1631 digital_poll_next_tech(ddev);
1633 dev_kfree_skb(resp);