1 /*
2 * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
3 *
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.
7 *
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.
12 *
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/>.
15 */
16
17 #include <net/nfc/hci.h>
18
19 #include "st21nfca.h"
20
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
30
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
38
39 #define ST21NFCA_NFC_DEP_PFB_IS_TIMEOUT(pfb) \
40 ((pfb) & ST21NFCA_NFC_DEP_PFB_TIMEOUT_BIT)
41
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
45
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
50
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
56
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
64
65 #define ST21NFCA_DEFAULT_TIMEOUT 0x0a
66
67
68 #define PROTOCOL_ERR(req) pr_err("%d: ST21NFCA Protocol error: %s\n", \
69 __LINE__, req)
70
71 struct st21nfca_atr_req {
72 u8 length;
73 u8 cmd0;
74 u8 cmd1;
75 u8 nfcid3[NFC_NFCID3_MAXSIZE];
76 u8 did;
77 u8 bsi;
78 u8 bri;
79 u8 ppi;
80 u8 gbi[0];
81 } __packed;
82
83 struct st21nfca_atr_res {
84 u8 length;
85 u8 cmd0;
86 u8 cmd1;
87 u8 nfcid3[NFC_NFCID3_MAXSIZE];
88 u8 did;
89 u8 bsi;
90 u8 bri;
91 u8 to;
92 u8 ppi;
93 u8 gbi[0];
94 } __packed;
95
96 struct st21nfca_psl_req {
97 u8 length;
98 u8 cmd0;
99 u8 cmd1;
100 u8 did;
101 u8 brs;
102 u8 fsl;
103 } __packed;
104
105 struct st21nfca_psl_res {
106 u8 length;
107 u8 cmd0;
108 u8 cmd1;
109 u8 did;
110 } __packed;
111
112 struct st21nfca_dep_req_res {
113 u8 length;
114 u8 cmd0;
115 u8 cmd1;
116 u8 pfb;
117 u8 did;
118 u8 nad;
119 } __packed;
120
st21nfca_tx_work(struct work_struct * work)121 static void st21nfca_tx_work(struct work_struct *work)
122 {
123 struct st21nfca_hci_info *info = container_of(work,
124 struct st21nfca_hci_info,
125 dep_info.tx_work);
126
127 struct nfc_dev *dev;
128 struct sk_buff *skb;
129
130 if (info) {
131 dev = info->hdev->ndev;
132 skb = info->dep_info.tx_pending;
133
134 device_lock(&dev->dev);
135
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);
140 kfree_skb(skb);
141 }
142 }
143
st21nfca_im_send_pdu(struct st21nfca_hci_info * info,struct sk_buff * skb)144 static void st21nfca_im_send_pdu(struct st21nfca_hci_info *info,
145 struct sk_buff *skb)
146 {
147 info->dep_info.tx_pending = skb;
148 schedule_work(&info->dep_info.tx_work);
149 }
150
st21nfca_tm_send_atr_res(struct nfc_hci_dev * hdev,struct st21nfca_atr_req * atr_req)151 static int st21nfca_tm_send_atr_res(struct nfc_hci_dev *hdev,
152 struct st21nfca_atr_req *atr_req)
153 {
154 struct st21nfca_atr_res *atr_res;
155 struct sk_buff *skb;
156 size_t gb_len;
157 int r;
158 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
159
160 gb_len = atr_req->length - sizeof(struct st21nfca_atr_req);
161 skb = alloc_skb(atr_req->length + 1, GFP_KERNEL);
162 if (!skb)
163 return -ENOMEM;
164
165 skb_put(skb, sizeof(struct st21nfca_atr_res));
166
167 atr_res = (struct st21nfca_atr_res *)skb->data;
168 memset(atr_res, 0, sizeof(struct st21nfca_atr_res));
169
170 atr_res->length = atr_req->length + 1;
171 atr_res->cmd0 = ST21NFCA_NFCIP1_RES;
172 atr_res->cmd1 = ST21NFCA_NFCIP1_ATR_RES;
173
174 memcpy(atr_res->nfcid3, atr_req->nfcid3, 6);
175 atr_res->bsi = 0x00;
176 atr_res->bri = 0x00;
177 atr_res->to = ST21NFCA_DEFAULT_TIMEOUT;
178 atr_res->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
179
180 if (gb_len) {
181 skb_put(skb, gb_len);
182
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,
186 gb_len);
187 if (r < 0) {
188 kfree_skb(skb);
189 return r;
190 }
191 }
192
193 info->dep_info.curr_nfc_dep_pni = 0;
194
195 r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
196 ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
197 kfree_skb(skb);
198 return r;
199 }
200
st21nfca_tm_recv_atr_req(struct nfc_hci_dev * hdev,struct sk_buff * skb)201 static int st21nfca_tm_recv_atr_req(struct nfc_hci_dev *hdev,
202 struct sk_buff *skb)
203 {
204 struct st21nfca_atr_req *atr_req;
205 size_t gb_len;
206 int r;
207
208 skb_trim(skb, skb->len - 1);
209
210 if (!skb->len) {
211 r = -EIO;
212 goto exit;
213 }
214
215 if (skb->len < ST21NFCA_ATR_REQ_MIN_SIZE) {
216 r = -EPROTO;
217 goto exit;
218 }
219
220 atr_req = (struct st21nfca_atr_req *)skb->data;
221
222 if (atr_req->length < sizeof(struct st21nfca_atr_req) ||
223 atr_req->length > skb->len) {
224 r = -EPROTO;
225 goto exit;
226 }
227
228 r = st21nfca_tm_send_atr_res(hdev, atr_req);
229 if (r)
230 goto exit;
231
232 gb_len = skb->len - sizeof(struct st21nfca_atr_req);
233
234 r = nfc_tm_activated(hdev->ndev, NFC_PROTO_NFC_DEP_MASK,
235 NFC_COMM_PASSIVE, atr_req->gbi, gb_len);
236 if (r)
237 goto exit;
238
239 r = 0;
240
241 exit:
242 return r;
243 }
244
st21nfca_tm_send_psl_res(struct nfc_hci_dev * hdev,struct st21nfca_psl_req * psl_req)245 static int st21nfca_tm_send_psl_res(struct nfc_hci_dev *hdev,
246 struct st21nfca_psl_req *psl_req)
247 {
248 struct st21nfca_psl_res *psl_res;
249 struct sk_buff *skb;
250 u8 bitrate[2] = {0, 0};
251 int r;
252
253 skb = alloc_skb(sizeof(struct st21nfca_psl_res), GFP_KERNEL);
254 if (!skb)
255 return -ENOMEM;
256 skb_put(skb, sizeof(struct st21nfca_psl_res));
257
258 psl_res = (struct st21nfca_psl_res *)skb->data;
259
260 psl_res->length = sizeof(struct st21nfca_psl_res);
261 psl_res->cmd0 = ST21NFCA_NFCIP1_RES;
262 psl_res->cmd1 = ST21NFCA_NFCIP1_PSL_RES;
263 psl_res->did = psl_req->did;
264
265 r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
266 ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
267 if (r < 0)
268 goto error;
269
270 /*
271 * ST21NFCA only support P2P passive.
272 * PSL_REQ BRS value != 0 has only a meaning to
273 * change technology to type F.
274 * We change to BITRATE 424Kbits.
275 * In other case switch to BITRATE 106Kbits.
276 */
277 if (ST21NFCA_PSL_REQ_SEND_SPEED(psl_req->brs) &&
278 ST21NFCA_PSL_REQ_RECV_SPEED(psl_req->brs)) {
279 bitrate[0] = ST21NFCA_CARD_BITRATE_424;
280 bitrate[1] = ST21NFCA_CARD_BITRATE_424;
281 }
282
283 /* Send an event to change bitrate change event to card f */
284 r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
285 ST21NFCA_EVT_CARD_F_BITRATE, bitrate, 2);
286 error:
287 kfree_skb(skb);
288 return r;
289 }
290
st21nfca_tm_recv_psl_req(struct nfc_hci_dev * hdev,struct sk_buff * skb)291 static int st21nfca_tm_recv_psl_req(struct nfc_hci_dev *hdev,
292 struct sk_buff *skb)
293 {
294 struct st21nfca_psl_req *psl_req;
295 int r;
296
297 skb_trim(skb, skb->len - 1);
298
299 if (!skb->len) {
300 r = -EIO;
301 goto exit;
302 }
303
304 psl_req = (struct st21nfca_psl_req *)skb->data;
305
306 if (skb->len < sizeof(struct st21nfca_psl_req)) {
307 r = -EIO;
308 goto exit;
309 }
310
311 r = st21nfca_tm_send_psl_res(hdev, psl_req);
312 exit:
313 return r;
314 }
315
st21nfca_tm_send_dep_res(struct nfc_hci_dev * hdev,struct sk_buff * skb)316 int st21nfca_tm_send_dep_res(struct nfc_hci_dev *hdev, struct sk_buff *skb)
317 {
318 int r;
319 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
320
321 *skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
322 *skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_RES;
323 *skb_push(skb, 1) = ST21NFCA_NFCIP1_RES;
324 *skb_push(skb, 1) = skb->len;
325
326 r = nfc_hci_send_event(hdev, ST21NFCA_RF_CARD_F_GATE,
327 ST21NFCA_EVT_SEND_DATA, skb->data, skb->len);
328 kfree_skb(skb);
329
330 return r;
331 }
332 EXPORT_SYMBOL(st21nfca_tm_send_dep_res);
333
st21nfca_tm_recv_dep_req(struct nfc_hci_dev * hdev,struct sk_buff * skb)334 static int st21nfca_tm_recv_dep_req(struct nfc_hci_dev *hdev,
335 struct sk_buff *skb)
336 {
337 struct st21nfca_dep_req_res *dep_req;
338 u8 size;
339 int r;
340 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
341
342 skb_trim(skb, skb->len - 1);
343
344 size = 4;
345
346 dep_req = (struct st21nfca_dep_req_res *)skb->data;
347 if (skb->len < size) {
348 r = -EIO;
349 goto exit;
350 }
351
352 if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_req->pfb))
353 size++;
354 if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_req->pfb))
355 size++;
356
357 if (skb->len < size) {
358 r = -EIO;
359 goto exit;
360 }
361
362 /* Receiving DEP_REQ - Decoding */
363 switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_req->pfb)) {
364 case ST21NFCA_NFC_DEP_PFB_I_PDU:
365 info->dep_info.curr_nfc_dep_pni =
366 ST21NFCA_NFC_DEP_PFB_PNI(dep_req->pfb);
367 break;
368 case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
369 pr_err("Received a ACK/NACK PDU\n");
370 break;
371 case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
372 pr_err("Received a SUPERVISOR PDU\n");
373 break;
374 }
375
376 skb_pull(skb, size);
377
378 return nfc_tm_data_received(hdev->ndev, skb);
379 exit:
380 return r;
381 }
382
st21nfca_tm_event_send_data(struct nfc_hci_dev * hdev,struct sk_buff * skb)383 static int st21nfca_tm_event_send_data(struct nfc_hci_dev *hdev,
384 struct sk_buff *skb)
385 {
386 u8 cmd0, cmd1;
387 int r;
388
389 cmd0 = skb->data[1];
390 switch (cmd0) {
391 case ST21NFCA_NFCIP1_REQ:
392 cmd1 = skb->data[2];
393 switch (cmd1) {
394 case ST21NFCA_NFCIP1_ATR_REQ:
395 r = st21nfca_tm_recv_atr_req(hdev, skb);
396 break;
397 case ST21NFCA_NFCIP1_PSL_REQ:
398 r = st21nfca_tm_recv_psl_req(hdev, skb);
399 break;
400 case ST21NFCA_NFCIP1_DEP_REQ:
401 r = st21nfca_tm_recv_dep_req(hdev, skb);
402 break;
403 default:
404 return 1;
405 }
406 default:
407 return 1;
408 }
409 return r;
410 }
411
412 /*
413 * Returns:
414 * <= 0: driver handled the event, skb consumed
415 * 1: driver does not handle the event, please do standard processing
416 */
st21nfca_dep_event_received(struct nfc_hci_dev * hdev,u8 event,struct sk_buff * skb)417 int st21nfca_dep_event_received(struct nfc_hci_dev *hdev,
418 u8 event, struct sk_buff *skb)
419 {
420 int r = 0;
421 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
422
423 pr_debug("dep event: %d\n", event);
424
425 switch (event) {
426 case ST21NFCA_EVT_CARD_ACTIVATED:
427 info->dep_info.curr_nfc_dep_pni = 0;
428 break;
429 case ST21NFCA_EVT_CARD_DEACTIVATED:
430 break;
431 case ST21NFCA_EVT_FIELD_ON:
432 break;
433 case ST21NFCA_EVT_FIELD_OFF:
434 break;
435 case ST21NFCA_EVT_SEND_DATA:
436 r = st21nfca_tm_event_send_data(hdev, skb);
437 if (r < 0)
438 return r;
439 return 0;
440 default:
441 nfc_err(&hdev->ndev->dev, "Unexpected event on card f gate\n");
442 return 1;
443 }
444 kfree_skb(skb);
445 return r;
446 }
447 EXPORT_SYMBOL(st21nfca_dep_event_received);
448
st21nfca_im_send_psl_req(struct nfc_hci_dev * hdev,u8 did,u8 bsi,u8 bri,u8 lri)449 static void st21nfca_im_send_psl_req(struct nfc_hci_dev *hdev, u8 did, u8 bsi,
450 u8 bri, u8 lri)
451 {
452 struct sk_buff *skb;
453 struct st21nfca_psl_req *psl_req;
454 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
455
456 skb =
457 alloc_skb(sizeof(struct st21nfca_psl_req) + 1, GFP_KERNEL);
458 if (!skb)
459 return;
460 skb_reserve(skb, 1);
461
462 skb_put(skb, sizeof(struct st21nfca_psl_req));
463 psl_req = (struct st21nfca_psl_req *) skb->data;
464
465 psl_req->length = sizeof(struct st21nfca_psl_req);
466 psl_req->cmd0 = ST21NFCA_NFCIP1_REQ;
467 psl_req->cmd1 = ST21NFCA_NFCIP1_PSL_REQ;
468 psl_req->did = did;
469 psl_req->brs = (0x30 & bsi << 4) | (bri & 0x03);
470 psl_req->fsl = lri;
471
472 *skb_push(skb, 1) = info->dep_info.to | 0x10;
473
474 st21nfca_im_send_pdu(info, skb);
475 }
476
477 #define ST21NFCA_CB_TYPE_READER_F 1
st21nfca_im_recv_atr_res_cb(void * context,struct sk_buff * skb,int err)478 static void st21nfca_im_recv_atr_res_cb(void *context, struct sk_buff *skb,
479 int err)
480 {
481 struct st21nfca_hci_info *info = context;
482 struct st21nfca_atr_res *atr_res;
483 int r;
484
485 if (err != 0)
486 return;
487
488 if (!skb)
489 return;
490
491 switch (info->async_cb_type) {
492 case ST21NFCA_CB_TYPE_READER_F:
493 skb_trim(skb, skb->len - 1);
494 atr_res = (struct st21nfca_atr_res *)skb->data;
495 r = nfc_set_remote_general_bytes(info->hdev->ndev,
496 atr_res->gbi,
497 skb->len - sizeof(struct st21nfca_atr_res));
498 if (r < 0)
499 return;
500
501 if (atr_res->to >= 0x0e)
502 info->dep_info.to = 0x0e;
503 else
504 info->dep_info.to = atr_res->to + 1;
505
506 info->dep_info.to |= 0x10;
507
508 r = nfc_dep_link_is_up(info->hdev->ndev, info->dep_info.idx,
509 NFC_COMM_PASSIVE, NFC_RF_INITIATOR);
510 if (r < 0)
511 return;
512
513 info->dep_info.curr_nfc_dep_pni = 0;
514 if (ST21NFCA_PP2LRI(atr_res->ppi) != info->dep_info.lri)
515 st21nfca_im_send_psl_req(info->hdev, atr_res->did,
516 atr_res->bsi, atr_res->bri,
517 ST21NFCA_PP2LRI(atr_res->ppi));
518 break;
519 default:
520 kfree_skb(skb);
521 break;
522 }
523 }
524
st21nfca_im_send_atr_req(struct nfc_hci_dev * hdev,u8 * gb,size_t gb_len)525 int st21nfca_im_send_atr_req(struct nfc_hci_dev *hdev, u8 *gb, size_t gb_len)
526 {
527 struct sk_buff *skb;
528 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
529 struct st21nfca_atr_req *atr_req;
530 struct nfc_target *target;
531 uint size;
532
533 info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
534 size = ST21NFCA_ATR_REQ_MIN_SIZE + gb_len;
535 if (size > ST21NFCA_ATR_REQ_MAX_SIZE) {
536 PROTOCOL_ERR("14.6.1.1");
537 return -EINVAL;
538 }
539
540 skb =
541 alloc_skb(sizeof(struct st21nfca_atr_req) + gb_len + 1, GFP_KERNEL);
542 if (!skb)
543 return -ENOMEM;
544
545 skb_reserve(skb, 1);
546
547 skb_put(skb, sizeof(struct st21nfca_atr_req));
548
549 atr_req = (struct st21nfca_atr_req *)skb->data;
550 memset(atr_req, 0, sizeof(struct st21nfca_atr_req));
551
552 atr_req->cmd0 = ST21NFCA_NFCIP1_REQ;
553 atr_req->cmd1 = ST21NFCA_NFCIP1_ATR_REQ;
554 memset(atr_req->nfcid3, 0, NFC_NFCID3_MAXSIZE);
555 target = hdev->ndev->targets;
556
557 if (target->sensf_res_len > 0)
558 memcpy(atr_req->nfcid3, target->sensf_res,
559 target->sensf_res_len);
560 else
561 get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE);
562
563 atr_req->did = 0x0;
564
565 atr_req->bsi = 0x00;
566 atr_req->bri = 0x00;
567 atr_req->ppi = ST21NFCA_LR_BITS_PAYLOAD_SIZE_254B;
568 if (gb_len) {
569 atr_req->ppi |= ST21NFCA_GB_BIT;
570 memcpy(skb_put(skb, gb_len), gb, gb_len);
571 }
572 atr_req->length = sizeof(struct st21nfca_atr_req) + hdev->gb_len;
573
574 *skb_push(skb, 1) = info->dep_info.to | 0x10; /* timeout */
575
576 info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
577 info->async_cb_context = info;
578 info->async_cb = st21nfca_im_recv_atr_res_cb;
579 info->dep_info.bri = atr_req->bri;
580 info->dep_info.bsi = atr_req->bsi;
581 info->dep_info.lri = ST21NFCA_PP2LRI(atr_req->ppi);
582
583 return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
584 ST21NFCA_WR_XCHG_DATA, skb->data,
585 skb->len, info->async_cb, info);
586 }
587 EXPORT_SYMBOL(st21nfca_im_send_atr_req);
588
st21nfca_im_recv_dep_res_cb(void * context,struct sk_buff * skb,int err)589 static void st21nfca_im_recv_dep_res_cb(void *context, struct sk_buff *skb,
590 int err)
591 {
592 struct st21nfca_hci_info *info = context;
593 struct st21nfca_dep_req_res *dep_res;
594
595 int size;
596
597 if (err != 0)
598 return;
599
600 if (!skb)
601 return;
602
603 switch (info->async_cb_type) {
604 case ST21NFCA_CB_TYPE_READER_F:
605 dep_res = (struct st21nfca_dep_req_res *)skb->data;
606
607 size = 3;
608 if (skb->len < size)
609 goto exit;
610
611 if (ST21NFCA_NFC_DEP_DID_BIT_SET(dep_res->pfb))
612 size++;
613 if (ST21NFCA_NFC_DEP_NAD_BIT_SET(dep_res->pfb))
614 size++;
615
616 if (skb->len < size)
617 goto exit;
618
619 skb_trim(skb, skb->len - 1);
620
621 /* Receiving DEP_REQ - Decoding */
622 switch (ST21NFCA_NFC_DEP_PFB_TYPE(dep_res->pfb)) {
623 case ST21NFCA_NFC_DEP_PFB_ACK_NACK_PDU:
624 pr_err("Received a ACK/NACK PDU\n");
625 case ST21NFCA_NFC_DEP_PFB_I_PDU:
626 info->dep_info.curr_nfc_dep_pni =
627 ST21NFCA_NFC_DEP_PFB_PNI(dep_res->pfb + 1);
628 size++;
629 skb_pull(skb, size);
630 nfc_tm_data_received(info->hdev->ndev, skb);
631 break;
632 case ST21NFCA_NFC_DEP_PFB_SUPERVISOR_PDU:
633 pr_err("Received a SUPERVISOR PDU\n");
634 skb_pull(skb, size);
635 *skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
636 *skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
637 *skb_push(skb, 1) = skb->len;
638 *skb_push(skb, 1) = info->dep_info.to | 0x10;
639
640 st21nfca_im_send_pdu(info, skb);
641 break;
642 }
643
644 return;
645 default:
646 break;
647 }
648
649 exit:
650 kfree_skb(skb);
651 }
652
st21nfca_im_send_dep_req(struct nfc_hci_dev * hdev,struct sk_buff * skb)653 int st21nfca_im_send_dep_req(struct nfc_hci_dev *hdev, struct sk_buff *skb)
654 {
655 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
656
657 info->async_cb_type = ST21NFCA_CB_TYPE_READER_F;
658 info->async_cb_context = info;
659 info->async_cb = st21nfca_im_recv_dep_res_cb;
660
661 *skb_push(skb, 1) = info->dep_info.curr_nfc_dep_pni;
662 *skb_push(skb, 1) = ST21NFCA_NFCIP1_DEP_REQ;
663 *skb_push(skb, 1) = ST21NFCA_NFCIP1_REQ;
664 *skb_push(skb, 1) = skb->len;
665
666 *skb_push(skb, 1) = info->dep_info.to | 0x10;
667
668 return nfc_hci_send_cmd_async(hdev, ST21NFCA_RF_READER_F_GATE,
669 ST21NFCA_WR_XCHG_DATA,
670 skb->data, skb->len,
671 info->async_cb, info);
672 }
673 EXPORT_SYMBOL(st21nfca_im_send_dep_req);
674
st21nfca_dep_init(struct nfc_hci_dev * hdev)675 void st21nfca_dep_init(struct nfc_hci_dev *hdev)
676 {
677 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
678
679 INIT_WORK(&info->dep_info.tx_work, st21nfca_tx_work);
680 info->dep_info.curr_nfc_dep_pni = 0;
681 info->dep_info.idx = 0;
682 info->dep_info.to = ST21NFCA_DEFAULT_TIMEOUT;
683 }
684 EXPORT_SYMBOL(st21nfca_dep_init);
685
st21nfca_dep_deinit(struct nfc_hci_dev * hdev)686 void st21nfca_dep_deinit(struct nfc_hci_dev *hdev)
687 {
688 struct st21nfca_hci_info *info = nfc_hci_get_clientdata(hdev);
689
690 cancel_work_sync(&info->dep_info.tx_work);
691 }
692 EXPORT_SYMBOL(st21nfca_dep_deinit);
693