2 * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, see <http://www.gnu.org/licenses/>.
17 #include <net/nfc/hci.h>
21 #define ST21NFCA_NFCIP1_INITIATOR 0x00
22 #define ST21NFCA_NFCIP1_REQ 0xd4
23 #define ST21NFCA_NFCIP1_RES 0xd5
24 #define ST21NFCA_NFCIP1_ATR_REQ 0x00
25 #define ST21NFCA_NFCIP1_ATR_RES 0x01
26 #define ST21NFCA_NFCIP1_PSL_REQ 0x04
27 #define ST21NFCA_NFCIP1_PSL_RES 0x05
28 #define ST21NFCA_NFCIP1_DEP_REQ 0x06
29 #define ST21NFCA_NFCIP1_DEP_RES 0x07
31 #define ST21NFCA_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03)
32 #define ST21NFCA_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0)
33 #define ST21NFCA_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
34 ((pfb) & ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT)
35 #define ST21NFCA_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & 0x04)
36 #define ST21NFCA_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08)
37 #define ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT 0x10
39 #define ST21NFCA_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
40 ((pfb) & ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT)
42 #define ST21NFCA_NFC_DEP_PFB_I_PDU 0x00
43 #define ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU 0x40
44 #define ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU 0x80
46 #define ST21NFCA_ATR_REQ_MIN_SIZE 17
47 #define ST21NFCA_ATR_REQ_MAX_SIZE 65
48 #define ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B 0x30
49 #define ST21NFCA_GB_BIT 0x02
51 #define ST21NFCA_EVT_SEND_DATA 0x10
52 #define ST21NFCA_EVT_FIELD_ON 0x11
53 #define ST21NFCA_EVT_CARD_DEACTIVATED 0x12
54 #define ST21NFCA_EVT_CARD_ACTIVATED 0x13
55 #define ST21NFCA_EVT_FIELD_OFF 0x14
57 #define ST21NFCA_EVT_CARD_F_BITRATE 0x16
58 #define ST21NFCA_EVT_READER_F_BITRATE 0x13
59 #define ST21NFCA_PSL_REQ_SEND_SPEED(brs) (brs & 0x38)
60 #define ST21NFCA_PSL_REQ_RECV_SPEED(brs) (brs & 0x07)
61 #define ST21NFCA_PP2LRI(pp) ((pp & 0x30) >> 4)
62 #define ST21NFCA_CARD_BITRATE_212 0x01
63 #define ST21NFCA_CARD_BITRATE_424 0x02
65 #define ST21NFCA_DEFAULT_TIMEOUT 0x0a
68 #define PROTOCOL_ERR(req) pr_err("%d: ST21NFCA Protocol error: %s\n", \
71 struct st21nfca_atr_req {
75 u8 nfcid3[NFC_NFCID3_MAXSIZE];
83 struct st21nfca_atr_res {
87 u8 nfcid3[NFC_NFCID3_MAXSIZE];
96 struct st21nfca_psl_req {
105 struct st21nfca_psl_res {
112 struct st21nfca_dep_req_res {
121 static void st21nfca_tx_work(struct work_struct *work)
123 struct st21nfca_hci_info *info = container_of(work,
124 struct st21nfca_hci_info,
131 dev = info->hdev->ndev;
132 skb = info->dep_info.tx_pending;
134 device_lock(&dev->dev);
136 nfc_hci_send_cmd_async(info->hdev, ST21NFCA_RF_READER_F_GATE,
137 ST21NFCA_WR_XCHG_DATA, skb->data, skb->len,
138 info->async_cb, info);
139 device_unlock(&dev->dev);
144 static void st21nfca_im_send_pdu(struct st21nfca_hci_info *info,
147 info->dep_info.tx_pending = skb;
148 schedule_work(&info->dep_info.tx_work);
151 static int st21nfca_tm_send_atr_res(struct nfc_hci_dev *hdev,
152 struct st21nfca_atr_req *atr_req)
154 struct st21nfca_atr_res *atr_res;
158 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
160 gb_len = atr_req->length - sizeof(struct st21nfca_atr_req);
161 skb = alloc_skb(atr_req->length + 1, GFP_KERNEL);
165 skb_put(skb, sizeof(struct st21nfca_atr_res));
167 atr_res = (struct st21nfca_atr_res *)skb->data;
168 memset(atr_res, 0, sizeof(struct st21nfca_atr_res));
170 atr_res->length = atr_req->length + 1;
171 atr_res->cmd0 = ST21NFCA_NFCIP1_RES;
172 atr_res->cmd1 = ST21NFCA_NFCIP1_ATR_RES;
174 memcpy(atr_res->nfcid3, atr_req->nfcid3, 6);
177 atr_res->to = ST21NFCA_DEFAULT_TIMEOUT;
178 atr_res->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
181 skb_put(skb, gb_len);
183 atr_res->ppi |= ST21NFCA_GB_BIT;
184 memcpy(atr_res->gbi, atr_req->gbi, gb_len);
185 r = nfc_set_remote_general_bytes(hdev->ndev, atr_res->gbi,
191 info->dep_info.curr_nfc_dep_pni = 0;
193 r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
194 ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
199 static int st21nfca_tm_recv_atr_req(struct nfc_hci_dev *hdev,
202 struct st21nfca_atr_req *atr_req;
206 skb_trim(skb, skb->len - 1);
213 if (skb->len < ST21NFCA_ATR_REQ_MIN_SIZE) {
218 atr_req = (struct st21nfca_atr_req *)skb->data;
220 if (atr_req->length < sizeof(struct st21nfca_atr_req)) {
225 r = st21nfca_tm_send_atr_res(hdev, atr_req);
229 gb_len = skb->len - sizeof(struct st21nfca_atr_req);
231 r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
232 NFC_COMM_PASSIVE, atr_req->gbi, gb_len);
242 static int st21nfca_tm_send_psl_res(struct nfc_hci_dev *hdev,
243 struct st21nfca_psl_req *psl_req)
245 struct st21nfca_psl_res *psl_res;
247 u8 bitrate[2] = {0, 0};
250 skb = alloc_skb(sizeof(struct st21nfca_psl_res), GFP_KERNEL);
253 skb_put(skb, sizeof(struct st21nfca_psl_res));
255 psl_res = (struct st21nfca_psl_res *)skb->data;
257 psl_res->length = sizeof(struct st21nfca_psl_res);
258 psl_res->cmd0 = ST21NFCA_NFCIP1_RES;
259 psl_res->cmd1 = ST21NFCA_NFCIP1_PSL_RES;
260 psl_res->did = psl_req->did;
262 r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
263 ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
268 * ST21NFCA only support P2P passive.
269 * PSL_REQ BRS value != 0 has only a meaning to
270 * change technology to type F.
271 * We change to BITRATE 424Kbits.
272 * In other case switch to BITRATE 106Kbits.
274 if (ST21NFCA_PSL_REQ_SEND_SPEED(psl_req->brs) &&
275 ST21NFCA_PSL_REQ_RECV_SPEED(psl_req->brs)) {
276 bitrate[0] = ST21NFCA_CARD_BITRATE_424;
277 bitrate[1] = ST21NFCA_CARD_BITRATE_424;
280 /* Send an event to change bitrate change event to card f */
281 r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
282 ST21NFCA_EVT_CARD_F_BITRATE, bitrate, 2);
288 static int st21nfca_tm_recv_psl_req(struct nfc_hci_dev *hdev,
291 struct st21nfca_psl_req *psl_req;
294 skb_trim(skb, skb->len - 1);
301 psl_req = (struct st21nfca_psl_req *)skb->data;
303 if (skb->len < sizeof(struct st21nfca_psl_req)) {
308 r = st21nfca_tm_send_psl_res(hdev, psl_req);
313 int st21nfca_tm_send_dep_res(struct nfc_hci_dev *hdev, struct sk_buff *skb)
316 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
318 *skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
319 *skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_RES;
320 *skb_push(skb, 1) = ST21NFCA_NFCIP1_RES;
321 *skb_push(skb, 1) = skb->len;
323 r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
324 ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
329 EXPORT_SYMBOL(st21nfca_tm_send_dep_res);
331 static int st21nfca_tm_recv_dep_req(struct nfc_hci_dev *hdev,
334 struct st21nfca_dep_req_res *dep_req;
337 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
339 skb_trim(skb, skb->len - 1);
343 dep_req = (struct st21nfca_dep_req_res *)skb->data;
344 if (skb->len < size) {
349 if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_req->pfb))
351 if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_req->pfb))
354 if (skb->len < size) {
359 /* Receiving DEP_REQ - Decoding */
360 switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_req->pfb)) {
361 case ST21NFCA_NFC_DEP_PFB_I_PDU:
362 info->dep_info.curr_nfc_dep_pni =
363 ST21NFCA_NFC_DEP_PFB_PNI(dep_req->pfb);
365 case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
366 pr_err("Received a ACK/NACK PDU\n");
368 case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
369 pr_err("Received a SUPERVISOR PDU\n");
375 return nfc_tm_data_received(hdev->ndev, skb);
380 static int st21nfca_tm_event_send_data(struct nfc_hci_dev *hdev,
388 case ST21NFCA_NFCIP1_REQ:
391 case ST21NFCA_NFCIP1_ATR_REQ:
392 r = st21nfca_tm_recv_atr_req(hdev, skb);
394 case ST21NFCA_NFCIP1_PSL_REQ:
395 r = st21nfca_tm_recv_psl_req(hdev, skb);
397 case ST21NFCA_NFCIP1_DEP_REQ:
398 r = st21nfca_tm_recv_dep_req(hdev, skb);
411 * <= 0: driver handled the event, skb consumed
412 * 1: driver does not handle the event, please do standard processing
414 int st21nfca_dep_event_received(struct nfc_hci_dev *hdev,
415 u8 event, struct sk_buff *skb)
418 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
420 pr_debug("dep event: %d\n", event);
423 case ST21NFCA_EVT_CARD_ACTIVATED:
424 info->dep_info.curr_nfc_dep_pni = 0;
426 case ST21NFCA_EVT_CARD_DEACTIVATED:
428 case ST21NFCA_EVT_FIELD_ON:
430 case ST21NFCA_EVT_FIELD_OFF:
432 case ST21NFCA_EVT_SEND_DATA:
433 r = st21nfca_tm_event_send_data(hdev, skb);
438 nfc_err(&hdev->ndev->dev, "Unexpected event on card f gate\n");
444 EXPORT_SYMBOL(st21nfca_dep_event_received);
446 static void st21nfca_im_send_psl_req(struct nfc_hci_dev *hdev, u8 did, u8 bsi,
450 struct st21nfca_psl_req *psl_req;
451 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
454 alloc_skb(sizeof(struct st21nfca_psl_req) + 1, GFP_KERNEL);
459 skb_put(skb, sizeof(struct st21nfca_psl_req));
460 psl_req = (struct st21nfca_psl_req *) skb->data;
462 psl_req->length = sizeof(struct st21nfca_psl_req);
463 psl_req->cmd0 = ST21NFCA_NFCIP1_REQ;
464 psl_req->cmd1 = ST21NFCA_NFCIP1_PSL_REQ;
466 psl_req->brs = (0x30 & bsi << 4) | (bri & 0x03);
469 *skb_push(skb, 1) = info->dep_info.to | 0x10;
471 st21nfca_im_send_pdu(info, skb);
474 #define ST21NFCA_CB_TYPE_READER_F 1
475 static void st21nfca_im_recv_atr_res_cb(void *context, struct sk_buff *skb,
478 struct st21nfca_hci_info *info = context;
479 struct st21nfca_atr_res *atr_res;
488 switch (info->async_cb_type) {
489 case ST21NFCA_CB_TYPE_READER_F:
490 skb_trim(skb, skb->len - 1);
491 atr_res = (struct st21nfca_atr_res *)skb->data;
492 r = nfc_set_remote_general_bytes(info->hdev->ndev,
494 skb->len - sizeof(struct st21nfca_atr_res));
498 if (atr_res->to >= 0x0e)
499 info->dep_info.to = 0x0e;
501 info->dep_info.to = atr_res->to + 1;
503 info->dep_info.to |= 0x10;
505 r = nfc_dep_link_is_up(info->hdev->ndev, info->dep_info.idx,
506 NFC_COMM_PASSIVE, NFC_RF_INITIATOR);
510 info->dep_info.curr_nfc_dep_pni = 0;
511 if (ST21NFCA_PP2LRI(atr_res->ppi) != info->dep_info.lri)
512 st21nfca_im_send_psl_req(info->hdev, atr_res->did,
513 atr_res->bsi, atr_res->bri,
514 ST21NFCA_PP2LRI(atr_res->ppi));
522 int st21nfca_im_send_atr_req(struct nfc_hci_dev *hdev, u8 *gb, size_t gb_len)
525 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
526 struct st21nfca_atr_req *atr_req;
527 struct nfc_target *target;
530 info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
531 size = ST21NFCA_ATR_REQ_MIN_SIZE + gb_len;
532 if (size > ST21NFCA_ATR_REQ_MAX_SIZE) {
533 PROTOCOL_ERR("14.6.1.1");
538 alloc_skb(sizeof(struct st21nfca_atr_req) + gb_len + 1, GFP_KERNEL);
544 skb_put(skb, sizeof(struct st21nfca_atr_req));
546 atr_req = (struct st21nfca_atr_req *)skb->data;
547 memset(atr_req, 0, sizeof(struct st21nfca_atr_req));
549 atr_req->cmd0 = ST21NFCA_NFCIP1_REQ;
550 atr_req->cmd1 = ST21NFCA_NFCIP1_ATR_REQ;
551 memset(atr_req->nfcid3, 0, NFC_NFCID3_MAXSIZE);
552 target = hdev->ndev->targets;
554 if (target->sensf_res_len > 0)
555 memcpy(atr_req->nfcid3, target->sensf_res,
556 target->sensf_res_len);
558 get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE);
564 atr_req->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
566 atr_req->ppi |= ST21NFCA_GB_BIT;
567 memcpy(skb_put(skb, gb_len), gb, gb_len);
569 atr_req->length = sizeof(struct st21nfca_atr_req) + hdev->gb_len;
571 *skb_push(skb, 1) = info->dep_info.to | 0x10; /* timeout */
573 info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
574 info->async_cb_context = info;
575 info->async_cb = st21nfca_im_recv_atr_res_cb;
576 info->dep_info.bri = atr_req->bri;
577 info->dep_info.bsi = atr_req->bsi;
578 info->dep_info.lri = ST21NFCA_PP2LRI(atr_req->ppi);
580 return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
581 ST21NFCA_WR_XCHG_DATA, skb->data,
582 skb->len, info->async_cb, info);
584 EXPORT_SYMBOL(st21nfca_im_send_atr_req);
586 static void st21nfca_im_recv_dep_res_cb(void *context, struct sk_buff *skb,
589 struct st21nfca_hci_info *info = context;
590 struct st21nfca_dep_req_res *dep_res;
600 switch (info->async_cb_type) {
601 case ST21NFCA_CB_TYPE_READER_F:
602 dep_res = (struct st21nfca_dep_req_res *)skb->data;
608 if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_res->pfb))
610 if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_res->pfb))
616 skb_trim(skb, skb->len - 1);
618 /* Receiving DEP_REQ - Decoding */
619 switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_res->pfb)) {
620 case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
621 pr_err("Received a ACK/NACK PDU\n");
622 case ST21NFCA_NFC_DEP_PFB_I_PDU:
623 info->dep_info.curr_nfc_dep_pni =
624 ST21NFCA_NFC_DEP_PFB_PNI(dep_res->pfb + 1);
627 nfc_tm_data_received(info->hdev->ndev, skb);
629 case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
630 pr_err("Received a SUPERVISOR PDU\n");
632 *skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
633 *skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
634 *skb_push(skb, 1) = skb->len;
635 *skb_push(skb, 1) = info->dep_info.to | 0x10;
637 st21nfca_im_send_pdu(info, skb);
650 int st21nfca_im_send_dep_req(struct nfc_hci_dev *hdev, struct sk_buff *skb)
652 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
654 info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
655 info->async_cb_context = info;
656 info->async_cb = st21nfca_im_recv_dep_res_cb;
658 *skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
659 *skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
660 *skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
661 *skb_push(skb, 1) = skb->len;
663 *skb_push(skb, 1) = info->dep_info.to | 0x10;
665 return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
666 ST21NFCA_WR_XCHG_DATA,
668 info->async_cb, info);
670 EXPORT_SYMBOL(st21nfca_im_send_dep_req);
672 void st21nfca_dep_init(struct nfc_hci_dev *hdev)
674 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
676 INIT_WORK(&info->dep_info.tx_work, st21nfca_tx_work);
677 info->dep_info.curr_nfc_dep_pni = 0;
678 info->dep_info.idx = 0;
679 info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
681 EXPORT_SYMBOL(st21nfca_dep_init);
683 void st21nfca_dep_deinit(struct nfc_hci_dev *hdev)
685 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
687 cancel_work_sync(&info->dep_info.tx_work);
689 EXPORT_SYMBOL(st21nfca_dep_deinit);