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>
20 #include "st21nfca_dep.h"
22 #define ST21NFCA_NFCIP1_INITIATOR 0x00
23 #define ST21NFCA_NFCIP1_REQ 0xd4
24 #define ST21NFCA_NFCIP1_RES 0xd5
25 #define ST21NFCA_NFCIP1_ATR_REQ 0x00
26 #define ST21NFCA_NFCIP1_ATR_RES 0x01
27 #define ST21NFCA_NFCIP1_PSL_REQ 0x04
28 #define ST21NFCA_NFCIP1_PSL_RES 0x05
29 #define ST21NFCA_NFCIP1_DEP_REQ 0x06
30 #define ST21NFCA_NFCIP1_DEP_RES 0x07
32 #define ST21NFCA_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03)
33 #define ST21NFCA_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0)
34 #define ST21NFCA_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
35 ((pfb) & ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT)
36 #define ST21NFCA_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & 0x04)
37 #define ST21NFCA_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08)
38 #define ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT 0x10
40 #define ST21NFCA_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
41 ((pfb) & ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT)
43 #define ST21NFCA_NFC_DEP_PFB_I_PDU 0x00
44 #define ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU 0x40
45 #define ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU 0x80
47 #define ST21NFCA_ATR_REQ_MIN_SIZE 17
48 #define ST21NFCA_ATR_REQ_MAX_SIZE 65
49 #define ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B 0x30
50 #define ST21NFCA_GB_BIT 0x02
52 #define ST21NFCA_EVT_CARD_F_BITRATE 0x16
53 #define ST21NFCA_EVT_READER_F_BITRATE 0x13
54 #define ST21NFCA_PSL_REQ_SEND_SPEED(brs) (brs & 0x38)
55 #define ST21NFCA_PSL_REQ_RECV_SPEED(brs) (brs & 0x07)
56 #define ST21NFCA_PP2LRI(pp) ((pp & 0x30) >> 4)
57 #define ST21NFCA_CARD_BITRATE_212 0x01
58 #define ST21NFCA_CARD_BITRATE_424 0x02
60 #define ST21NFCA_DEFAULT_TIMEOUT 0x0a
63 #define PROTOCOL_ERR(req) pr_err("%d: ST21NFCA Protocol error: %s\n", \
66 struct st21nfca_atr_req {
70 u8 nfcid3[NFC_NFCID3_MAXSIZE];
78 struct st21nfca_atr_res {
82 u8 nfcid3[NFC_NFCID3_MAXSIZE];
91 struct st21nfca_psl_req {
100 struct st21nfca_psl_res {
107 struct st21nfca_dep_req_res {
116 static void st21nfca_tx_work(struct work_struct *work)
118 struct st21nfca_hci_info *info = container_of(work,
119 struct st21nfca_hci_info,
125 dev = info->hdev->ndev;
126 skb = info->dep_info.tx_pending;
128 device_lock(&dev->dev);
130 nfc_hci_send_cmd_async(info->hdev, ST21NFCA_RF_READER_F_GATE,
131 ST21NFCA_WR_XCHG_DATA,
133 info->async_cb, info);
134 device_unlock(&dev->dev);
139 static void st21nfca_im_send_pdu(struct st21nfca_hci_info *info,
142 info->dep_info.tx_pending = skb;
143 schedule_work(&info->dep_info.tx_work);
146 static int st21nfca_tm_send_atr_res(struct nfc_hci_dev *hdev,
147 struct st21nfca_atr_req *atr_req)
149 struct st21nfca_atr_res *atr_res;
153 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
155 gb_len = atr_req->length - sizeof(struct st21nfca_atr_req);
156 skb = alloc_skb(atr_req->length + 1, GFP_KERNEL);
160 skb_put(skb, sizeof(struct st21nfca_atr_res));
162 atr_res = (struct st21nfca_atr_res *)skb->data;
163 memset(atr_res, 0, sizeof(struct st21nfca_atr_res));
165 atr_res->length = atr_req->length + 1;
166 atr_res->cmd0 = ST21NFCA_NFCIP1_RES;
167 atr_res->cmd1 = ST21NFCA_NFCIP1_ATR_RES;
169 memcpy(atr_res->nfcid3, atr_req->nfcid3, 6);
172 atr_res->to = ST21NFCA_DEFAULT_TIMEOUT;
173 atr_res->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
176 skb_put(skb, gb_len);
178 atr_res->ppi |= ST21NFCA_GB_BIT;
179 memcpy(atr_res->gbi, atr_req->gbi, gb_len);
180 r = nfc_set_remote_general_bytes(hdev->ndev, atr_res->gbi,
186 info->dep_info.curr_nfc_dep_pni = 0;
188 return nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
189 ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
192 static int st21nfca_tm_recv_atr_req(struct nfc_hci_dev *hdev,
195 struct st21nfca_atr_req *atr_req;
199 skb_trim(skb, skb->len - 1);
210 if (skb->len < ST21NFCA_ATR_REQ_MIN_SIZE) {
215 atr_req = (struct st21nfca_atr_req *)skb->data;
217 r = st21nfca_tm_send_atr_res(hdev, atr_req);
221 gb_len = skb->len - sizeof(struct st21nfca_atr_req);
223 r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
224 NFC_COMM_PASSIVE, atr_req->gbi, gb_len);
234 static int st21nfca_tm_send_psl_res(struct nfc_hci_dev *hdev,
235 struct st21nfca_psl_req *psl_req)
237 struct st21nfca_psl_res *psl_res;
239 u8 bitrate[2] = {0, 0};
243 skb = alloc_skb(sizeof(struct st21nfca_psl_res), GFP_KERNEL);
246 skb_put(skb, sizeof(struct st21nfca_psl_res));
248 psl_res = (struct st21nfca_psl_res *)skb->data;
250 psl_res->length = sizeof(struct st21nfca_psl_res);
251 psl_res->cmd0 = ST21NFCA_NFCIP1_RES;
252 psl_res->cmd1 = ST21NFCA_NFCIP1_PSL_RES;
253 psl_res->did = psl_req->did;
255 r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
256 ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
259 * ST21NFCA only support P2P passive.
260 * PSL_REQ BRS value != 0 has only a meaning to
261 * change technology to type F.
262 * We change to BITRATE 424Kbits.
263 * In other case switch to BITRATE 106Kbits.
265 if (ST21NFCA_PSL_REQ_SEND_SPEED(psl_req->brs) &&
266 ST21NFCA_PSL_REQ_RECV_SPEED(psl_req->brs)) {
267 bitrate[0] = ST21NFCA_CARD_BITRATE_424;
268 bitrate[1] = ST21NFCA_CARD_BITRATE_424;
271 /* Send an event to change bitrate change event to card f */
272 return nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
273 ST21NFCA_EVT_CARD_F_BITRATE, bitrate, 2);
276 static int st21nfca_tm_recv_psl_req(struct nfc_hci_dev *hdev,
279 struct st21nfca_psl_req *psl_req;
282 skb_trim(skb, skb->len - 1);
294 psl_req = (struct st21nfca_psl_req *)skb->data;
296 if (skb->len < sizeof(struct st21nfca_psl_req)) {
301 r = st21nfca_tm_send_psl_res(hdev, psl_req);
306 int st21nfca_tm_send_dep_res(struct nfc_hci_dev *hdev, struct sk_buff *skb)
309 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
311 *skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
312 *skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_RES;
313 *skb_push(skb, 1) = ST21NFCA_NFCIP1_RES;
314 *skb_push(skb, 1) = skb->len;
316 r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
317 ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
322 EXPORT_SYMBOL(st21nfca_tm_send_dep_res);
324 static int st21nfca_tm_recv_dep_req(struct nfc_hci_dev *hdev,
327 struct st21nfca_dep_req_res *dep_req;
330 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
332 skb_trim(skb, skb->len - 1);
341 dep_req = (struct st21nfca_dep_req_res *)skb->data;
342 if (skb->len < size) {
347 if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_req->pfb))
349 if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_req->pfb))
352 if (skb->len < size) {
357 /* Receiving DEP_REQ - Decoding */
358 switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_req->pfb)) {
359 case ST21NFCA_NFC_DEP_PFB_I_PDU:
360 info->dep_info.curr_nfc_dep_pni =
361 ST21NFCA_NFC_DEP_PFB_PNI(dep_req->pfb);
363 case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
364 pr_err("Received a ACK/NACK PDU\n");
366 case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
367 pr_err("Received a SUPERVISOR PDU\n");
379 return nfc_tm_data_received(hdev->ndev, skb);
384 int st21nfca_tm_event_send_data(struct nfc_hci_dev *hdev, struct sk_buff *skb,
392 case ST21NFCA_NFCIP1_REQ:
395 case ST21NFCA_NFCIP1_ATR_REQ:
396 r = st21nfca_tm_recv_atr_req(hdev, skb);
398 case ST21NFCA_NFCIP1_PSL_REQ:
399 r = st21nfca_tm_recv_psl_req(hdev, skb);
401 case ST21NFCA_NFCIP1_DEP_REQ:
402 r = st21nfca_tm_recv_dep_req(hdev, skb);
412 EXPORT_SYMBOL(st21nfca_tm_event_send_data);
414 static void st21nfca_im_send_psl_req(struct nfc_hci_dev *hdev, u8 did, u8 bsi,
418 struct st21nfca_psl_req *psl_req;
419 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
422 alloc_skb(sizeof(struct st21nfca_psl_req) + 1, GFP_KERNEL);
427 skb_put(skb, sizeof(struct st21nfca_psl_req));
428 psl_req = (struct st21nfca_psl_req *) skb->data;
430 psl_req->length = sizeof(struct st21nfca_psl_req);
431 psl_req->cmd0 = ST21NFCA_NFCIP1_REQ;
432 psl_req->cmd1 = ST21NFCA_NFCIP1_PSL_REQ;
434 psl_req->brs = (0x30 & bsi << 4) | (bri & 0x03);
437 *skb_push(skb, 1) = info->dep_info.to | 0x10;
439 st21nfca_im_send_pdu(info, skb);
444 #define ST21NFCA_CB_TYPE_READER_F 1
445 static void st21nfca_im_recv_atr_res_cb(void *context, struct sk_buff *skb,
448 struct st21nfca_hci_info *info = context;
449 struct st21nfca_atr_res *atr_res;
458 switch (info->async_cb_type) {
459 case ST21NFCA_CB_TYPE_READER_F:
460 skb_trim(skb, skb->len - 1);
461 atr_res = (struct st21nfca_atr_res *)skb->data;
462 r = nfc_set_remote_general_bytes(info->hdev->ndev,
464 skb->len - sizeof(struct st21nfca_atr_res));
468 if (atr_res->to >= 0x0e)
469 info->dep_info.to = 0x0e;
471 info->dep_info.to = atr_res->to + 1;
473 info->dep_info.to |= 0x10;
475 r = nfc_dep_link_is_up(info->hdev->ndev, info->dep_info.idx,
476 NFC_COMM_PASSIVE, NFC_RF_INITIATOR);
480 info->dep_info.curr_nfc_dep_pni = 0;
481 if (ST21NFCA_PP2LRI(atr_res->ppi) != info->dep_info.lri)
482 st21nfca_im_send_psl_req(info->hdev, atr_res->did,
483 atr_res->bsi, atr_res->bri,
484 ST21NFCA_PP2LRI(atr_res->ppi));
493 int st21nfca_im_send_atr_req(struct nfc_hci_dev *hdev, u8 *gb, size_t gb_len)
496 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
497 struct st21nfca_atr_req *atr_req;
498 struct nfc_target *target;
501 info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
502 size = ST21NFCA_ATR_REQ_MIN_SIZE + gb_len;
503 if (size > ST21NFCA_ATR_REQ_MAX_SIZE) {
504 PROTOCOL_ERR("14.6.1.1");
509 alloc_skb(sizeof(struct st21nfca_atr_req) + gb_len + 1, GFP_KERNEL);
515 skb_put(skb, sizeof(struct st21nfca_atr_req));
517 atr_req = (struct st21nfca_atr_req *)skb->data;
518 memset(atr_req, 0, sizeof(struct st21nfca_atr_req));
520 atr_req->cmd0 = ST21NFCA_NFCIP1_REQ;
521 atr_req->cmd1 = ST21NFCA_NFCIP1_ATR_REQ;
522 memset(atr_req->nfcid3, 0, NFC_NFCID3_MAXSIZE);
523 target = hdev->ndev->targets;
525 if (target->sensf_res)
526 memcpy(atr_req->nfcid3, target->sensf_res,
527 target->sensf_res_len);
529 get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE);
535 atr_req->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
537 atr_req->ppi |= ST21NFCA_GB_BIT;
538 memcpy(skb_put(skb, gb_len), gb, gb_len);
540 atr_req->length = sizeof(struct st21nfca_atr_req) + hdev->gb_len;
542 *skb_push(skb, 1) = info->dep_info.to | 0x10; /* timeout */
544 info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
545 info->async_cb_context = info;
546 info->async_cb = st21nfca_im_recv_atr_res_cb;
547 info->dep_info.bri = atr_req->bri;
548 info->dep_info.bsi = atr_req->bsi;
549 info->dep_info.lri = ST21NFCA_PP2LRI(atr_req->ppi);
551 return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
552 ST21NFCA_WR_XCHG_DATA, skb->data,
553 skb->len, info->async_cb, info);
555 EXPORT_SYMBOL(st21nfca_im_send_atr_req);
557 static void st21nfca_im_recv_dep_res_cb(void *context, struct sk_buff *skb,
560 struct st21nfca_hci_info *info = context;
561 struct st21nfca_dep_req_res *dep_res;
571 switch (info->async_cb_type) {
572 case ST21NFCA_CB_TYPE_READER_F:
573 dep_res = (struct st21nfca_dep_req_res *)skb->data;
579 if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_res->pfb))
581 if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_res->pfb))
587 skb_trim(skb, skb->len - 1);
589 /* Receiving DEP_REQ - Decoding */
590 switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_res->pfb)) {
591 case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
592 pr_err("Received a ACK/NACK PDU\n");
593 case ST21NFCA_NFC_DEP_PFB_I_PDU:
594 info->dep_info.curr_nfc_dep_pni =
595 ST21NFCA_NFC_DEP_PFB_PNI(dep_res->pfb + 1);
598 nfc_tm_data_received(info->hdev->ndev, skb);
600 case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
601 pr_err("Received a SUPERVISOR PDU\n");
603 *skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
604 *skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
605 *skb_push(skb, 1) = skb->len;
606 *skb_push(skb, 1) = info->dep_info.to | 0x10;
608 st21nfca_im_send_pdu(info, skb);
622 int st21nfca_im_send_dep_req(struct nfc_hci_dev *hdev, struct sk_buff *skb)
624 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
626 info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
627 info->async_cb_context = info;
628 info->async_cb = st21nfca_im_recv_dep_res_cb;
630 *skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
631 *skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
632 *skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
633 *skb_push(skb, 1) = skb->len;
635 *skb_push(skb, 1) = info->dep_info.to | 0x10;
637 return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
638 ST21NFCA_WR_XCHG_DATA,
640 info->async_cb, info);
642 EXPORT_SYMBOL(st21nfca_im_send_dep_req);
644 void st21nfca_dep_init(struct nfc_hci_dev *hdev)
646 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
648 INIT_WORK(&info->dep_info.tx_work, st21nfca_tx_work);
649 info->dep_info.curr_nfc_dep_pni = 0;
650 info->dep_info.idx = 0;
651 info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
653 EXPORT_SYMBOL(st21nfca_dep_init);
655 void st21nfca_dep_deinit(struct nfc_hci_dev *hdev)
657 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
659 cancel_work_sync(&info->dep_info.tx_work);
661 EXPORT_SYMBOL(st21nfca_dep_deinit);