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_DID_MAX 14
37 #define DIGITAL_PAYLOAD_SIZE_MAX 254
38 #define DIGITAL_PAYLOAD_BITS_TO_PP(s) (((s) & 0x3) << 4)
39 #define DIGITAL_PAYLOAD_PP_TO_BITS(s) (((s) >> 4) & 0x3)
40 #define DIGITAL_PAYLOAD_BITS_TO_FSL(s) ((s) & 0x3)
41 #define DIGITAL_PAYLOAD_FSL_TO_BITS(s) ((s) & 0x3)
43 #define DIGITAL_GB_BIT 0x02
45 #define DIGITAL_NFC_DEP_REQ_RES_HEADROOM 2 /* SoD: [SB (NFC-A)] + LEN */
46 #define DIGITAL_NFC_DEP_REQ_RES_TAILROOM 2 /* EoD: 2-byte CRC */
48 #define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0)
50 #define DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT 0x10
51 #define DIGITAL_NFC_DEP_PFB_MI_BIT 0x10
52 #define DIGITAL_NFC_DEP_PFB_NACK_BIT 0x10
53 #define DIGITAL_NFC_DEP_PFB_DID_BIT 0x04
55 #define DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
56 ((pfb) & DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT)
57 #define DIGITAL_NFC_DEP_MI_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_MI_BIT)
58 #define DIGITAL_NFC_DEP_NACK_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_NACK_BIT)
59 #define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08)
60 #define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_DID_BIT)
61 #define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03)
63 #define DIGITAL_NFC_DEP_PFB_I_PDU 0x00
64 #define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40
65 #define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80
67 struct digital_atr_req {
78 struct digital_atr_res {
90 struct digital_psl_req {
98 struct digital_psl_res {
104 struct digital_dep_req_res {
110 static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg,
111 struct sk_buff *resp);
112 static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg,
113 struct sk_buff *resp);
115 static const u8 digital_payload_bits_map[4] = {
122 static u8 digital_payload_bits_to_size(u8 payload_bits)
124 if (payload_bits >= ARRAY_SIZE(digital_payload_bits_map))
127 return digital_payload_bits_map[payload_bits];
130 static u8 digital_payload_size_to_bits(u8 payload_size)
134 for (i = 0; i < ARRAY_SIZE(digital_payload_bits_map); i++)
135 if (digital_payload_bits_map[i] == payload_size)
141 static void digital_skb_push_dep_sod(struct nfc_digital_dev *ddev,
144 skb_push(skb, sizeof(u8));
146 skb->data[0] = skb->len;
148 if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)
149 *skb_push(skb, sizeof(u8)) = DIGITAL_NFC_DEP_NFCA_SOD_SB;
152 static int digital_skb_pull_dep_sod(struct nfc_digital_dev *ddev,
160 if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)
161 skb_pull(skb, sizeof(u8));
164 if (size != skb->len)
167 skb_pull(skb, sizeof(u8));
172 static struct sk_buff *
173 digital_send_dep_data_prep(struct nfc_digital_dev *ddev, struct sk_buff *skb,
174 struct digital_dep_req_res *dep_req_res,
175 struct digital_data_exch *data_exch)
177 struct sk_buff *new_skb;
179 if (skb->len > ddev->remote_payload_max) {
180 dep_req_res->pfb |= DIGITAL_NFC_DEP_PFB_MI_BIT;
182 new_skb = digital_skb_alloc(ddev, ddev->remote_payload_max);
184 kfree_skb(ddev->chaining_skb);
185 ddev->chaining_skb = NULL;
187 return ERR_PTR(-ENOMEM);
190 skb_reserve(new_skb, ddev->tx_headroom + NFC_HEADER_SIZE +
191 DIGITAL_NFC_DEP_REQ_RES_HEADROOM);
192 memcpy(skb_put(new_skb, ddev->remote_payload_max), skb->data,
193 ddev->remote_payload_max);
194 skb_pull(skb, ddev->remote_payload_max);
196 ddev->chaining_skb = skb;
197 ddev->data_exch = data_exch;
199 ddev->chaining_skb = NULL;
206 static struct sk_buff *
207 digital_recv_dep_data_gather(struct nfc_digital_dev *ddev, u8 pfb,
208 struct sk_buff *resp,
209 int (*send_ack)(struct nfc_digital_dev *ddev,
210 struct digital_data_exch
212 struct digital_data_exch *data_exch)
214 struct sk_buff *new_skb;
217 if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb) && (!ddev->chaining_skb)) {
219 nfc_alloc_recv_skb(8 * ddev->local_payload_max,
221 if (!ddev->chaining_skb) {
227 if (ddev->chaining_skb) {
228 if (resp->len > skb_tailroom(ddev->chaining_skb)) {
229 new_skb = skb_copy_expand(ddev->chaining_skb,
232 8 * ddev->local_payload_max,
239 kfree_skb(ddev->chaining_skb);
240 ddev->chaining_skb = new_skb;
243 memcpy(skb_put(ddev->chaining_skb, resp->len), resp->data,
249 if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb)) {
250 rc = send_ack(ddev, data_exch);
257 resp = ddev->chaining_skb;
258 ddev->chaining_skb = NULL;
266 kfree_skb(ddev->chaining_skb);
267 ddev->chaining_skb = NULL;
272 static void digital_in_recv_psl_res(struct nfc_digital_dev *ddev, void *arg,
273 struct sk_buff *resp)
275 struct nfc_target *target = arg;
276 struct digital_psl_res *psl_res;
285 rc = ddev->skb_check_crc(resp);
287 PROTOCOL_ERR("14.4.1.6");
291 rc = digital_skb_pull_dep_sod(ddev, resp);
293 PROTOCOL_ERR("14.4.1.2");
297 psl_res = (struct digital_psl_res *)resp->data;
299 if ((resp->len != sizeof(*psl_res)) ||
300 (psl_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN) ||
301 (psl_res->cmd != DIGITAL_CMD_PSL_RES)) {
306 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
307 NFC_DIGITAL_RF_TECH_424F);
311 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
312 NFC_DIGITAL_FRAMING_NFCF_NFC_DEP);
316 if (!DIGITAL_DRV_CAPS_IN_CRC(ddev) &&
317 (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)) {
318 ddev->skb_add_crc = digital_skb_add_crc_f;
319 ddev->skb_check_crc = digital_skb_check_crc_f;
322 ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_424F;
324 nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE,
327 ddev->curr_nfc_dep_pni = 0;
333 ddev->curr_protocol = 0;
336 static int digital_in_send_psl_req(struct nfc_digital_dev *ddev,
337 struct nfc_target *target)
340 struct digital_psl_req *psl_req;
342 u8 payload_size, payload_bits;
344 skb = digital_skb_alloc(ddev, sizeof(*psl_req));
348 skb_put(skb, sizeof(*psl_req));
350 psl_req = (struct digital_psl_req *)skb->data;
352 psl_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
353 psl_req->cmd = DIGITAL_CMD_PSL_REQ;
355 psl_req->brs = (0x2 << 3) | 0x2; /* 424F both directions */
357 payload_size = min(ddev->local_payload_max, ddev->remote_payload_max);
358 payload_bits = digital_payload_size_to_bits(payload_size);
359 psl_req->fsl = DIGITAL_PAYLOAD_BITS_TO_FSL(payload_bits);
361 ddev->local_payload_max = payload_size;
362 ddev->remote_payload_max = payload_size;
364 digital_skb_push_dep_sod(ddev, skb);
366 ddev->skb_add_crc(skb);
368 rc = digital_in_send_cmd(ddev, skb, 500, digital_in_recv_psl_res,
376 static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg,
377 struct sk_buff *resp)
379 struct nfc_target *target = arg;
380 struct digital_atr_res *atr_res;
381 u8 gb_len, payload_bits;
390 rc = ddev->skb_check_crc(resp);
392 PROTOCOL_ERR("14.4.1.6");
396 rc = digital_skb_pull_dep_sod(ddev, resp);
398 PROTOCOL_ERR("14.4.1.2");
402 if (resp->len < sizeof(struct digital_atr_res)) {
407 gb_len = resp->len - sizeof(struct digital_atr_res);
409 atr_res = (struct digital_atr_res *)resp->data;
411 payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_res->pp);
412 ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits);
414 if (!ddev->remote_payload_max) {
419 rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len);
423 if ((ddev->protocols & NFC_PROTO_FELICA_MASK) &&
424 (ddev->curr_rf_tech != NFC_DIGITAL_RF_TECH_424F)) {
425 rc = digital_in_send_psl_req(ddev, target);
430 rc = nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE,
433 ddev->curr_nfc_dep_pni = 0;
439 ddev->curr_protocol = 0;
442 int digital_in_send_atr_req(struct nfc_digital_dev *ddev,
443 struct nfc_target *target, __u8 comm_mode, __u8 *gb,
447 struct digital_atr_req *atr_req;
452 size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len;
454 if (size > DIGITAL_ATR_REQ_MAX_SIZE) {
455 PROTOCOL_ERR("14.6.1.1");
459 skb = digital_skb_alloc(ddev, size);
463 skb_put(skb, sizeof(struct digital_atr_req));
465 atr_req = (struct digital_atr_req *)skb->data;
466 memset(atr_req, 0, sizeof(struct digital_atr_req));
468 atr_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
469 atr_req->cmd = DIGITAL_CMD_ATR_REQ;
470 if (target->nfcid2_len)
471 memcpy(atr_req->nfcid3, target->nfcid2, NFC_NFCID2_MAXSIZE);
473 get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE);
479 ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX;
480 payload_bits = digital_payload_size_to_bits(ddev->local_payload_max);
481 atr_req->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits);
484 atr_req->pp |= DIGITAL_GB_BIT;
485 memcpy(skb_put(skb, gb_len), gb, gb_len);
488 digital_skb_push_dep_sod(ddev, skb);
490 ddev->skb_add_crc(skb);
492 rc = digital_in_send_cmd(ddev, skb, 500, digital_in_recv_atr_res,
500 static int digital_in_send_ack(struct nfc_digital_dev *ddev,
501 struct digital_data_exch *data_exch)
503 struct digital_dep_req_res *dep_req;
507 skb = digital_skb_alloc(ddev, 1);
511 skb_push(skb, sizeof(struct digital_dep_req_res));
513 dep_req = (struct digital_dep_req_res *)skb->data;
515 dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
516 dep_req->cmd = DIGITAL_CMD_DEP_REQ;
517 dep_req->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU |
518 ddev->curr_nfc_dep_pni;
520 digital_skb_push_dep_sod(ddev, skb);
522 ddev->skb_add_crc(skb);
524 rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res,
532 static int digital_in_send_rtox(struct nfc_digital_dev *ddev,
533 struct digital_data_exch *data_exch, u8 rtox)
535 struct digital_dep_req_res *dep_req;
539 skb = digital_skb_alloc(ddev, 1);
543 *skb_put(skb, 1) = rtox;
545 skb_push(skb, sizeof(struct digital_dep_req_res));
547 dep_req = (struct digital_dep_req_res *)skb->data;
549 dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
550 dep_req->cmd = DIGITAL_CMD_DEP_REQ;
551 dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU |
552 DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT;
554 digital_skb_push_dep_sod(ddev, skb);
556 ddev->skb_add_crc(skb);
558 rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res,
566 static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg,
567 struct sk_buff *resp)
569 struct digital_data_exch *data_exch = arg;
570 struct digital_dep_req_res *dep_res;
581 rc = ddev->skb_check_crc(resp);
583 PROTOCOL_ERR("14.4.1.6");
587 rc = digital_skb_pull_dep_sod(ddev, resp);
589 PROTOCOL_ERR("14.4.1.2");
593 if (resp->len > ddev->local_payload_max) {
598 size = sizeof(struct digital_dep_req_res);
599 dep_res = (struct digital_dep_req_res *)resp->data;
601 if (resp->len < size || dep_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN ||
602 dep_res->cmd != DIGITAL_CMD_DEP_RES) {
609 if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) {
610 PROTOCOL_ERR("14.8.2.1");
615 if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) {
620 if (size > resp->len) {
625 skb_pull(resp, size);
627 switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) {
628 case DIGITAL_NFC_DEP_PFB_I_PDU:
629 if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) {
630 PROTOCOL_ERR("14.12.3.3");
635 ddev->curr_nfc_dep_pni =
636 DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1);
638 resp = digital_recv_dep_data_gather(ddev, pfb, resp,
647 /* If resp is NULL then we're still chaining so return and
648 * wait for the next part of the PDU. Else, the PDU is
649 * complete so pass it up.
657 case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU:
658 if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) {
659 PROTOCOL_ERR("14.12.3.3");
664 ddev->curr_nfc_dep_pni =
665 DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1);
667 if (ddev->chaining_skb && !DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) {
668 rc = digital_in_send_dep_req(ddev, NULL,
677 pr_err("Received a ACK/NACK PDU\n");
681 case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU:
682 if (!DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) {
687 rc = digital_in_send_rtox(ddev, data_exch, resp->data[0]);
696 data_exch->cb(data_exch->cb_context, resp, rc);
701 kfree_skb(ddev->chaining_skb);
702 ddev->chaining_skb = NULL;
708 int digital_in_send_dep_req(struct nfc_digital_dev *ddev,
709 struct nfc_target *target, struct sk_buff *skb,
710 struct digital_data_exch *data_exch)
712 struct digital_dep_req_res *dep_req;
713 struct sk_buff *chaining_skb, *tmp_skb;
716 skb_push(skb, sizeof(struct digital_dep_req_res));
718 dep_req = (struct digital_dep_req_res *)skb->data;
720 dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT;
721 dep_req->cmd = DIGITAL_CMD_DEP_REQ;
722 dep_req->pfb = ddev->curr_nfc_dep_pni;
724 chaining_skb = ddev->chaining_skb;
726 tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_req, data_exch);
728 return PTR_ERR(tmp_skb);
730 digital_skb_push_dep_sod(ddev, tmp_skb);
732 ddev->skb_add_crc(tmp_skb);
734 rc = digital_in_send_cmd(ddev, tmp_skb, 1500, digital_in_recv_dep_res,
740 kfree_skb(chaining_skb);
741 ddev->chaining_skb = NULL;
747 static void digital_tg_set_rf_tech(struct nfc_digital_dev *ddev, u8 rf_tech)
749 ddev->curr_rf_tech = rf_tech;
751 ddev->skb_add_crc = digital_skb_add_crc_none;
752 ddev->skb_check_crc = digital_skb_check_crc_none;
754 if (DIGITAL_DRV_CAPS_TG_CRC(ddev))
757 switch (ddev->curr_rf_tech) {
758 case NFC_DIGITAL_RF_TECH_106A:
759 ddev->skb_add_crc = digital_skb_add_crc_a;
760 ddev->skb_check_crc = digital_skb_check_crc_a;
763 case NFC_DIGITAL_RF_TECH_212F:
764 case NFC_DIGITAL_RF_TECH_424F:
765 ddev->skb_add_crc = digital_skb_add_crc_f;
766 ddev->skb_check_crc = digital_skb_check_crc_f;
774 static int digital_tg_send_ack(struct nfc_digital_dev *ddev,
775 struct digital_data_exch *data_exch)
777 struct digital_dep_req_res *dep_res;
781 skb = digital_skb_alloc(ddev, 1);
785 skb_push(skb, sizeof(struct digital_dep_req_res));
787 dep_res = (struct digital_dep_req_res *)skb->data;
789 dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN;
790 dep_res->cmd = DIGITAL_CMD_DEP_RES;
791 dep_res->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU |
792 ddev->curr_nfc_dep_pni;
795 dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT;
797 memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did,
801 ddev->curr_nfc_dep_pni =
802 DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1);
804 digital_skb_push_dep_sod(ddev, skb);
806 ddev->skb_add_crc(skb);
808 rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req,
816 static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg,
817 struct sk_buff *resp)
820 struct digital_dep_req_res *dep_req;
830 rc = ddev->skb_check_crc(resp);
832 PROTOCOL_ERR("14.4.1.6");
836 rc = digital_skb_pull_dep_sod(ddev, resp);
838 PROTOCOL_ERR("14.4.1.2");
842 if (resp->len > ddev->local_payload_max) {
847 size = sizeof(struct digital_dep_req_res);
848 dep_req = (struct digital_dep_req_res *)resp->data;
850 if (resp->len < size || dep_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT ||
851 dep_req->cmd != DIGITAL_CMD_DEP_REQ) {
858 if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) {
859 if (ddev->did && (ddev->did == resp->data[3])) {
865 } else if (ddev->did) {
870 if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) {
875 if (size > resp->len) {
880 skb_pull(resp, size);
882 switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) {
883 case DIGITAL_NFC_DEP_PFB_I_PDU:
884 pr_debug("DIGITAL_NFC_DEP_PFB_I_PDU\n");
886 if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) {
887 PROTOCOL_ERR("14.12.3.4");
892 resp = digital_recv_dep_data_gather(ddev, pfb, resp,
893 digital_tg_send_ack, NULL);
900 /* If resp is NULL then we're still chaining so return and
901 * wait for the next part of the PDU. Else, the PDU is
902 * complete so pass it up.
909 case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU:
910 if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) {
911 PROTOCOL_ERR("14.12.3.4");
916 if (ddev->chaining_skb && !DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) {
917 rc = digital_tg_send_dep_res(ddev, ddev->chaining_skb);
924 pr_err("Received a ACK/NACK PDU\n");
927 case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU:
928 pr_err("Received a SUPERVISOR PDU\n");
933 rc = nfc_tm_data_received(ddev->nfc_dev, resp);
936 kfree_skb(ddev->chaining_skb);
937 ddev->chaining_skb = NULL;
943 int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb)
945 struct digital_dep_req_res *dep_res;
946 struct sk_buff *chaining_skb, *tmp_skb;
949 skb_push(skb, sizeof(struct digital_dep_req_res));
951 dep_res = (struct digital_dep_req_res *)skb->data;
953 dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN;
954 dep_res->cmd = DIGITAL_CMD_DEP_RES;
955 dep_res->pfb = ddev->curr_nfc_dep_pni;
958 dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT;
960 memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did,
964 ddev->curr_nfc_dep_pni =
965 DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1);
967 chaining_skb = ddev->chaining_skb;
969 tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_res, NULL);
971 return PTR_ERR(tmp_skb);
973 digital_skb_push_dep_sod(ddev, tmp_skb);
975 ddev->skb_add_crc(tmp_skb);
977 rc = digital_tg_send_cmd(ddev, tmp_skb, 1500, digital_tg_recv_dep_req,
983 kfree_skb(chaining_skb);
984 ddev->chaining_skb = NULL;
990 static void digital_tg_send_psl_res_complete(struct nfc_digital_dev *ddev,
991 void *arg, struct sk_buff *resp)
993 u8 rf_tech = (unsigned long)arg;
998 digital_tg_set_rf_tech(ddev, rf_tech);
1000 digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech);
1002 digital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL);
1004 dev_kfree_skb(resp);
1007 static int digital_tg_send_psl_res(struct nfc_digital_dev *ddev, u8 did,
1010 struct digital_psl_res *psl_res;
1011 struct sk_buff *skb;
1014 skb = digital_skb_alloc(ddev, sizeof(struct digital_psl_res));
1018 skb_put(skb, sizeof(struct digital_psl_res));
1020 psl_res = (struct digital_psl_res *)skb->data;
1022 psl_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN;
1023 psl_res->cmd = DIGITAL_CMD_PSL_RES;
1026 digital_skb_push_dep_sod(ddev, skb);
1028 ddev->skb_add_crc(skb);
1030 ddev->curr_nfc_dep_pni = 0;
1032 rc = digital_tg_send_cmd(ddev, skb, 0, digital_tg_send_psl_res_complete,
1033 (void *)(unsigned long)rf_tech);
1040 static void digital_tg_recv_psl_req(struct nfc_digital_dev *ddev, void *arg,
1041 struct sk_buff *resp)
1044 struct digital_psl_req *psl_req;
1046 u8 dsi, payload_size, payload_bits;
1054 rc = ddev->skb_check_crc(resp);
1056 PROTOCOL_ERR("14.4.1.6");
1060 rc = digital_skb_pull_dep_sod(ddev, resp);
1062 PROTOCOL_ERR("14.4.1.2");
1066 psl_req = (struct digital_psl_req *)resp->data;
1068 if (resp->len != sizeof(struct digital_psl_req) ||
1069 psl_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT ||
1070 psl_req->cmd != DIGITAL_CMD_PSL_REQ) {
1075 dsi = (psl_req->brs >> 3) & 0x07;
1078 rf_tech = NFC_DIGITAL_RF_TECH_106A;
1081 rf_tech = NFC_DIGITAL_RF_TECH_212F;
1084 rf_tech = NFC_DIGITAL_RF_TECH_424F;
1087 pr_err("Unsupported dsi value %d\n", dsi);
1091 payload_bits = DIGITAL_PAYLOAD_FSL_TO_BITS(psl_req->fsl);
1092 payload_size = digital_payload_bits_to_size(payload_bits);
1094 if (!payload_size || (payload_size > min(ddev->local_payload_max,
1095 ddev->remote_payload_max))) {
1100 ddev->local_payload_max = payload_size;
1101 ddev->remote_payload_max = payload_size;
1103 rc = digital_tg_send_psl_res(ddev, psl_req->did, rf_tech);
1109 static void digital_tg_send_atr_res_complete(struct nfc_digital_dev *ddev,
1110 void *arg, struct sk_buff *resp)
1115 digital_poll_next_tech(ddev);
1120 if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB)
1123 if (resp->data[offset] == DIGITAL_CMD_PSL_REQ)
1124 digital_tg_recv_psl_req(ddev, arg, resp);
1126 digital_tg_recv_dep_req(ddev, arg, resp);
1129 static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev,
1130 struct digital_atr_req *atr_req)
1132 struct digital_atr_res *atr_res;
1133 struct sk_buff *skb;
1134 u8 *gb, payload_bits;
1138 gb = nfc_get_local_general_bytes(ddev->nfc_dev, &gb_len);
1142 skb = digital_skb_alloc(ddev, sizeof(struct digital_atr_res) + gb_len);
1146 skb_put(skb, sizeof(struct digital_atr_res));
1147 atr_res = (struct digital_atr_res *)skb->data;
1149 memset(atr_res, 0, sizeof(struct digital_atr_res));
1151 atr_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN;
1152 atr_res->cmd = DIGITAL_CMD_ATR_RES;
1153 memcpy(atr_res->nfcid3, atr_req->nfcid3, sizeof(atr_req->nfcid3));
1156 ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX;
1157 payload_bits = digital_payload_size_to_bits(ddev->local_payload_max);
1158 atr_res->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits);
1161 skb_put(skb, gb_len);
1163 atr_res->pp |= DIGITAL_GB_BIT;
1164 memcpy(atr_res->gb, gb, gb_len);
1167 digital_skb_push_dep_sod(ddev, skb);
1169 ddev->skb_add_crc(skb);
1171 ddev->curr_nfc_dep_pni = 0;
1173 rc = digital_tg_send_cmd(ddev, skb, 999,
1174 digital_tg_send_atr_res_complete, NULL);
1181 void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg,
1182 struct sk_buff *resp)
1185 struct digital_atr_req *atr_req;
1186 size_t gb_len, min_size;
1187 u8 poll_tech_count, payload_bits;
1200 if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) {
1201 min_size = DIGITAL_ATR_REQ_MIN_SIZE + 2;
1202 digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_106A);
1204 min_size = DIGITAL_ATR_REQ_MIN_SIZE + 1;
1205 digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_212F);
1208 if (resp->len < min_size) {
1213 ddev->curr_protocol = NFC_PROTO_NFC_DEP_MASK;
1215 rc = ddev->skb_check_crc(resp);
1217 PROTOCOL_ERR("14.4.1.6");
1221 rc = digital_skb_pull_dep_sod(ddev, resp);
1223 PROTOCOL_ERR("14.4.1.2");
1227 atr_req = (struct digital_atr_req *)resp->data;
1229 if (atr_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT ||
1230 atr_req->cmd != DIGITAL_CMD_ATR_REQ ||
1231 atr_req->did > DIGITAL_DID_MAX) {
1236 payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_req->pp);
1237 ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits);
1239 if (!ddev->remote_payload_max) {
1244 ddev->did = atr_req->did;
1246 rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
1247 NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED);
1251 rc = digital_tg_send_atr_res(ddev, atr_req);
1255 gb_len = resp->len - sizeof(struct digital_atr_req);
1257 poll_tech_count = ddev->poll_tech_count;
1258 ddev->poll_tech_count = 0;
1260 rc = nfc_tm_activated(ddev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1261 NFC_COMM_PASSIVE, atr_req->gb, gb_len);
1263 ddev->poll_tech_count = poll_tech_count;
1270 digital_poll_next_tech(ddev);
1272 dev_kfree_skb(resp);