Commit | Line | Data |
---|---|---|
7d0911c0 TE |
1 | /* |
2 | * NFC Digital Protocol stack | |
3 | * Copyright (c) 2013, Intel Corporation. | |
4 | * | |
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. | |
8 | * | |
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 | |
12 | * more details. | |
13 | * | |
14 | */ | |
15 | ||
c5da0e4a SO |
16 | #define pr_fmt(fmt) "digital: %s: " fmt, __func__ |
17 | ||
7d0911c0 TE |
18 | #include "digital.h" |
19 | ||
20 | #define DIGITAL_NFC_DEP_FRAME_DIR_OUT 0xD4 | |
21 | #define DIGITAL_NFC_DEP_FRAME_DIR_IN 0xD5 | |
22 | ||
23 | #define DIGITAL_NFC_DEP_NFCA_SOD_SB 0xF0 | |
24 | ||
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 | |
31 | ||
32 | #define DIGITAL_ATR_REQ_MIN_SIZE 16 | |
33 | #define DIGITAL_ATR_REQ_MAX_SIZE 64 | |
34 | ||
35 | #define DIGITAL_NFCID3_LEN ((u8)8) | |
36 | #define DIGITAL_LR_BITS_PAYLOAD_SIZE_254B 0x30 | |
37 | #define DIGITAL_GB_BIT 0x02 | |
38 | ||
39 | #define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0) | |
40 | ||
41 | #define DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT 0x10 | |
42 | ||
43 | #define DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb) \ | |
44 | ((pfb) & DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT) | |
45 | #define DIGITAL_NFC_DEP_MI_BIT_SET(pfb) ((pfb) & 0x10) | |
46 | #define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08) | |
47 | #define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & 0x04) | |
48 | #define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03) | |
49 | ||
50 | #define DIGITAL_NFC_DEP_PFB_I_PDU 0x00 | |
51 | #define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40 | |
52 | #define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80 | |
53 | ||
54 | struct digital_atr_req { | |
55 | u8 dir; | |
56 | u8 cmd; | |
57 | u8 nfcid3[10]; | |
58 | u8 did; | |
59 | u8 bs; | |
60 | u8 br; | |
61 | u8 pp; | |
62 | u8 gb[0]; | |
63 | } __packed; | |
64 | ||
65 | struct digital_atr_res { | |
66 | u8 dir; | |
67 | u8 cmd; | |
68 | u8 nfcid3[10]; | |
69 | u8 did; | |
70 | u8 bs; | |
71 | u8 br; | |
72 | u8 to; | |
73 | u8 pp; | |
74 | u8 gb[0]; | |
75 | } __packed; | |
76 | ||
77 | struct digital_psl_req { | |
78 | u8 dir; | |
79 | u8 cmd; | |
80 | u8 did; | |
81 | u8 brs; | |
82 | u8 fsl; | |
83 | } __packed; | |
84 | ||
85 | struct digital_psl_res { | |
86 | u8 dir; | |
87 | u8 cmd; | |
88 | u8 did; | |
89 | } __packed; | |
90 | ||
91 | struct digital_dep_req_res { | |
92 | u8 dir; | |
93 | u8 cmd; | |
94 | u8 pfb; | |
95 | } __packed; | |
96 | ||
97 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, | |
98 | struct sk_buff *resp); | |
99 | ||
100 | static void digital_skb_push_dep_sod(struct nfc_digital_dev *ddev, | |
101 | struct sk_buff *skb) | |
102 | { | |
103 | skb_push(skb, sizeof(u8)); | |
104 | ||
105 | skb->data[0] = skb->len; | |
106 | ||
107 | if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) | |
108 | *skb_push(skb, sizeof(u8)) = DIGITAL_NFC_DEP_NFCA_SOD_SB; | |
109 | } | |
110 | ||
111 | static int digital_skb_pull_dep_sod(struct nfc_digital_dev *ddev, | |
112 | struct sk_buff *skb) | |
113 | { | |
114 | u8 size; | |
115 | ||
116 | if (skb->len < 2) | |
117 | return -EIO; | |
118 | ||
119 | if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) | |
120 | skb_pull(skb, sizeof(u8)); | |
121 | ||
122 | size = skb->data[0]; | |
123 | if (size != skb->len) | |
124 | return -EIO; | |
125 | ||
126 | skb_pull(skb, sizeof(u8)); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg, | |
132 | struct sk_buff *resp) | |
133 | { | |
134 | struct nfc_target *target = arg; | |
135 | struct digital_atr_res *atr_res; | |
136 | u8 gb_len; | |
137 | int rc; | |
138 | ||
139 | if (IS_ERR(resp)) { | |
140 | rc = PTR_ERR(resp); | |
141 | resp = NULL; | |
142 | goto exit; | |
143 | } | |
144 | ||
145 | rc = ddev->skb_check_crc(resp); | |
146 | if (rc) { | |
147 | PROTOCOL_ERR("14.4.1.6"); | |
148 | goto exit; | |
149 | } | |
150 | ||
151 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
152 | if (rc) { | |
153 | PROTOCOL_ERR("14.4.1.2"); | |
154 | goto exit; | |
155 | } | |
156 | ||
157 | if (resp->len < sizeof(struct digital_atr_res)) { | |
158 | rc = -EIO; | |
159 | goto exit; | |
160 | } | |
161 | ||
162 | gb_len = resp->len - sizeof(struct digital_atr_res); | |
163 | ||
164 | atr_res = (struct digital_atr_res *)resp->data; | |
165 | ||
166 | rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len); | |
167 | if (rc) | |
168 | goto exit; | |
169 | ||
170 | rc = nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, | |
171 | NFC_RF_INITIATOR); | |
172 | ||
173 | ddev->curr_nfc_dep_pni = 0; | |
174 | ||
175 | exit: | |
176 | dev_kfree_skb(resp); | |
177 | ||
178 | if (rc) | |
179 | ddev->curr_protocol = 0; | |
180 | } | |
181 | ||
182 | int digital_in_send_atr_req(struct nfc_digital_dev *ddev, | |
183 | struct nfc_target *target, __u8 comm_mode, __u8 *gb, | |
184 | size_t gb_len) | |
185 | { | |
186 | struct sk_buff *skb; | |
187 | struct digital_atr_req *atr_req; | |
188 | uint size; | |
189 | ||
190 | size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len; | |
191 | ||
192 | if (size > DIGITAL_ATR_REQ_MAX_SIZE) { | |
193 | PROTOCOL_ERR("14.6.1.1"); | |
194 | return -EINVAL; | |
195 | } | |
196 | ||
197 | skb = digital_skb_alloc(ddev, size); | |
198 | if (!skb) | |
199 | return -ENOMEM; | |
200 | ||
201 | skb_put(skb, sizeof(struct digital_atr_req)); | |
202 | ||
203 | atr_req = (struct digital_atr_req *)skb->data; | |
204 | memset(atr_req, 0, sizeof(struct digital_atr_req)); | |
205 | ||
206 | atr_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
207 | atr_req->cmd = DIGITAL_CMD_ATR_REQ; | |
208 | if (target->nfcid2_len) | |
209 | memcpy(atr_req->nfcid3, target->nfcid2, | |
210 | max(target->nfcid2_len, DIGITAL_NFCID3_LEN)); | |
211 | else | |
212 | get_random_bytes(atr_req->nfcid3, DIGITAL_NFCID3_LEN); | |
213 | ||
214 | atr_req->did = 0; | |
215 | atr_req->bs = 0; | |
216 | atr_req->br = 0; | |
217 | ||
218 | atr_req->pp = DIGITAL_LR_BITS_PAYLOAD_SIZE_254B; | |
219 | ||
220 | if (gb_len) { | |
221 | atr_req->pp |= DIGITAL_GB_BIT; | |
222 | memcpy(skb_put(skb, gb_len), gb, gb_len); | |
223 | } | |
224 | ||
225 | digital_skb_push_dep_sod(ddev, skb); | |
226 | ||
227 | ddev->skb_add_crc(skb); | |
228 | ||
229 | digital_in_send_cmd(ddev, skb, 500, digital_in_recv_atr_res, target); | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | static int digital_in_send_rtox(struct nfc_digital_dev *ddev, | |
235 | struct digital_data_exch *data_exch, u8 rtox) | |
236 | { | |
237 | struct digital_dep_req_res *dep_req; | |
238 | struct sk_buff *skb; | |
239 | int rc; | |
240 | ||
241 | skb = digital_skb_alloc(ddev, 1); | |
242 | if (!skb) | |
243 | return -ENOMEM; | |
244 | ||
245 | *skb_put(skb, 1) = rtox; | |
246 | ||
247 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
248 | ||
249 | dep_req = (struct digital_dep_req_res *)skb->data; | |
250 | ||
251 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
252 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
253 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU | | |
254 | DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT; | |
255 | ||
256 | digital_skb_push_dep_sod(ddev, skb); | |
257 | ||
258 | ddev->skb_add_crc(skb); | |
259 | ||
260 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, | |
261 | data_exch); | |
262 | ||
263 | return rc; | |
264 | } | |
265 | ||
266 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, | |
267 | struct sk_buff *resp) | |
268 | { | |
269 | struct digital_data_exch *data_exch = arg; | |
270 | struct digital_dep_req_res *dep_res; | |
271 | u8 pfb; | |
272 | uint size; | |
273 | int rc; | |
274 | ||
275 | if (IS_ERR(resp)) { | |
276 | rc = PTR_ERR(resp); | |
277 | resp = NULL; | |
278 | goto exit; | |
279 | } | |
280 | ||
281 | rc = ddev->skb_check_crc(resp); | |
282 | if (rc) { | |
283 | PROTOCOL_ERR("14.4.1.6"); | |
284 | goto error; | |
285 | } | |
286 | ||
287 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
288 | if (rc) { | |
289 | PROTOCOL_ERR("14.4.1.2"); | |
290 | goto exit; | |
291 | } | |
292 | ||
293 | dep_res = (struct digital_dep_req_res *)resp->data; | |
294 | ||
295 | if (resp->len < sizeof(struct digital_dep_req_res) || | |
296 | dep_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN || | |
297 | dep_res->cmd != DIGITAL_CMD_DEP_RES) { | |
298 | rc = -EIO; | |
299 | goto error; | |
300 | } | |
301 | ||
302 | pfb = dep_res->pfb; | |
303 | ||
304 | switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { | |
305 | case DIGITAL_NFC_DEP_PFB_I_PDU: | |
306 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { | |
307 | PROTOCOL_ERR("14.12.3.3"); | |
308 | rc = -EIO; | |
309 | goto error; | |
310 | } | |
311 | ||
312 | ddev->curr_nfc_dep_pni = | |
313 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
314 | rc = 0; | |
315 | break; | |
316 | ||
317 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: | |
c5da0e4a | 318 | pr_err("Received a ACK/NACK PDU"); |
7d0911c0 TE |
319 | rc = -EIO; |
320 | goto error; | |
321 | ||
322 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: | |
323 | if (!DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { | |
324 | rc = -EINVAL; | |
325 | goto error; | |
326 | } | |
327 | ||
328 | rc = digital_in_send_rtox(ddev, data_exch, resp->data[3]); | |
329 | if (rc) | |
330 | goto error; | |
331 | ||
332 | kfree_skb(resp); | |
333 | return; | |
334 | } | |
335 | ||
336 | if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb)) { | |
c5da0e4a | 337 | pr_err("MI bit set. Chained PDU not supported."); |
7d0911c0 TE |
338 | rc = -EIO; |
339 | goto error; | |
340 | } | |
341 | ||
342 | size = sizeof(struct digital_dep_req_res); | |
343 | ||
344 | if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) | |
345 | size++; | |
346 | ||
347 | if (size > resp->len) { | |
348 | rc = -EIO; | |
349 | goto error; | |
350 | } | |
351 | ||
352 | skb_pull(resp, size); | |
353 | ||
354 | exit: | |
355 | data_exch->cb(data_exch->cb_context, resp, rc); | |
356 | ||
357 | error: | |
358 | kfree(data_exch); | |
359 | ||
360 | if (rc) | |
361 | kfree_skb(resp); | |
362 | } | |
363 | ||
364 | int digital_in_send_dep_req(struct nfc_digital_dev *ddev, | |
365 | struct nfc_target *target, struct sk_buff *skb, | |
366 | struct digital_data_exch *data_exch) | |
367 | { | |
368 | struct digital_dep_req_res *dep_req; | |
369 | ||
370 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
371 | ||
372 | dep_req = (struct digital_dep_req_res *)skb->data; | |
373 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
374 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
375 | dep_req->pfb = ddev->curr_nfc_dep_pni; | |
376 | ||
377 | digital_skb_push_dep_sod(ddev, skb); | |
378 | ||
379 | ddev->skb_add_crc(skb); | |
380 | ||
381 | return digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, | |
382 | data_exch); | |
383 | } | |
1c7a4c24 TE |
384 | |
385 | static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, | |
386 | struct sk_buff *resp) | |
387 | { | |
388 | int rc; | |
389 | struct digital_dep_req_res *dep_req; | |
390 | size_t size; | |
391 | ||
392 | if (IS_ERR(resp)) { | |
393 | rc = PTR_ERR(resp); | |
394 | resp = NULL; | |
395 | goto exit; | |
396 | } | |
397 | ||
398 | rc = ddev->skb_check_crc(resp); | |
399 | if (rc) { | |
400 | PROTOCOL_ERR("14.4.1.6"); | |
401 | goto exit; | |
402 | } | |
403 | ||
404 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
405 | if (rc) { | |
406 | PROTOCOL_ERR("14.4.1.2"); | |
407 | goto exit; | |
408 | } | |
409 | ||
410 | size = sizeof(struct digital_dep_req_res); | |
411 | dep_req = (struct digital_dep_req_res *)resp->data; | |
412 | ||
413 | if (resp->len < size || dep_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
414 | dep_req->cmd != DIGITAL_CMD_DEP_REQ) { | |
415 | rc = -EIO; | |
416 | goto exit; | |
417 | } | |
418 | ||
419 | if (DIGITAL_NFC_DEP_DID_BIT_SET(dep_req->pfb)) | |
420 | size++; | |
421 | ||
422 | if (resp->len < size) { | |
423 | rc = -EIO; | |
424 | goto exit; | |
425 | } | |
426 | ||
427 | switch (DIGITAL_NFC_DEP_PFB_TYPE(dep_req->pfb)) { | |
428 | case DIGITAL_NFC_DEP_PFB_I_PDU: | |
c5da0e4a | 429 | pr_debug("DIGITAL_NFC_DEP_PFB_I_PDU"); |
1c7a4c24 TE |
430 | ddev->curr_nfc_dep_pni = DIGITAL_NFC_DEP_PFB_PNI(dep_req->pfb); |
431 | break; | |
432 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: | |
c5da0e4a | 433 | pr_err("Received a ACK/NACK PDU"); |
1c7a4c24 TE |
434 | rc = -EINVAL; |
435 | goto exit; | |
436 | break; | |
437 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: | |
c5da0e4a | 438 | pr_err("Received a SUPERVISOR PDU"); |
1c7a4c24 TE |
439 | rc = -EINVAL; |
440 | goto exit; | |
441 | break; | |
442 | } | |
443 | ||
444 | skb_pull(resp, size); | |
445 | ||
446 | rc = nfc_tm_data_received(ddev->nfc_dev, resp); | |
447 | ||
448 | exit: | |
449 | if (rc) | |
450 | kfree_skb(resp); | |
451 | } | |
452 | ||
453 | int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb) | |
454 | { | |
455 | struct digital_dep_req_res *dep_res; | |
456 | ||
457 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
458 | dep_res = (struct digital_dep_req_res *)skb->data; | |
459 | ||
460 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
461 | dep_res->cmd = DIGITAL_CMD_DEP_RES; | |
462 | dep_res->pfb = ddev->curr_nfc_dep_pni; | |
463 | ||
464 | digital_skb_push_dep_sod(ddev, skb); | |
465 | ||
466 | ddev->skb_add_crc(skb); | |
467 | ||
468 | return digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, | |
469 | NULL); | |
470 | } | |
471 | ||
472 | static void digital_tg_send_psl_res_complete(struct nfc_digital_dev *ddev, | |
473 | void *arg, struct sk_buff *resp) | |
474 | { | |
475 | u8 rf_tech = PTR_ERR(arg); | |
476 | ||
477 | if (IS_ERR(resp)) | |
478 | return; | |
479 | ||
480 | digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); | |
481 | ||
482 | digital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL); | |
483 | ||
484 | dev_kfree_skb(resp); | |
485 | } | |
486 | ||
487 | static int digital_tg_send_psl_res(struct nfc_digital_dev *ddev, u8 did, | |
488 | u8 rf_tech) | |
489 | { | |
490 | struct digital_psl_res *psl_res; | |
491 | struct sk_buff *skb; | |
492 | int rc; | |
493 | ||
494 | skb = digital_skb_alloc(ddev, sizeof(struct digital_psl_res)); | |
495 | if (!skb) | |
496 | return -ENOMEM; | |
497 | ||
498 | skb_put(skb, sizeof(struct digital_psl_res)); | |
499 | ||
500 | psl_res = (struct digital_psl_res *)skb->data; | |
501 | ||
502 | psl_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
503 | psl_res->cmd = DIGITAL_CMD_PSL_RES; | |
504 | psl_res->did = did; | |
505 | ||
506 | digital_skb_push_dep_sod(ddev, skb); | |
507 | ||
508 | ddev->skb_add_crc(skb); | |
509 | ||
510 | rc = digital_tg_send_cmd(ddev, skb, 0, digital_tg_send_psl_res_complete, | |
511 | ERR_PTR(rf_tech)); | |
512 | ||
513 | if (rc) | |
514 | kfree_skb(skb); | |
515 | ||
516 | return rc; | |
517 | } | |
518 | ||
519 | static void digital_tg_recv_psl_req(struct nfc_digital_dev *ddev, void *arg, | |
520 | struct sk_buff *resp) | |
521 | { | |
522 | int rc; | |
523 | struct digital_psl_req *psl_req; | |
524 | u8 rf_tech; | |
525 | u8 dsi; | |
526 | ||
527 | if (IS_ERR(resp)) { | |
528 | rc = PTR_ERR(resp); | |
529 | resp = NULL; | |
530 | goto exit; | |
531 | } | |
532 | ||
533 | rc = ddev->skb_check_crc(resp); | |
534 | if (rc) { | |
535 | PROTOCOL_ERR("14.4.1.6"); | |
536 | goto exit; | |
537 | } | |
538 | ||
539 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
540 | if (rc) { | |
541 | PROTOCOL_ERR("14.4.1.2"); | |
542 | goto exit; | |
543 | } | |
544 | ||
545 | psl_req = (struct digital_psl_req *)resp->data; | |
546 | ||
547 | if (resp->len != sizeof(struct digital_psl_req) || | |
548 | psl_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
549 | psl_req->cmd != DIGITAL_CMD_PSL_REQ) { | |
550 | rc = -EIO; | |
551 | goto exit; | |
552 | } | |
553 | ||
554 | dsi = (psl_req->brs >> 3) & 0x07; | |
555 | switch (dsi) { | |
556 | case 0: | |
557 | rf_tech = NFC_DIGITAL_RF_TECH_106A; | |
558 | break; | |
559 | case 1: | |
560 | rf_tech = NFC_DIGITAL_RF_TECH_212F; | |
561 | break; | |
562 | case 2: | |
563 | rf_tech = NFC_DIGITAL_RF_TECH_424F; | |
564 | break; | |
565 | default: | |
c5da0e4a | 566 | pr_err("Unsuported dsi value %d", dsi); |
1c7a4c24 TE |
567 | goto exit; |
568 | } | |
569 | ||
570 | rc = digital_tg_send_psl_res(ddev, psl_req->did, rf_tech); | |
571 | ||
572 | exit: | |
573 | kfree_skb(resp); | |
574 | } | |
575 | ||
576 | static void digital_tg_send_atr_res_complete(struct nfc_digital_dev *ddev, | |
577 | void *arg, struct sk_buff *resp) | |
578 | { | |
579 | int offset; | |
580 | ||
581 | if (IS_ERR(resp)) { | |
582 | digital_poll_next_tech(ddev); | |
583 | return; | |
584 | } | |
585 | ||
586 | offset = 2; | |
587 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) | |
588 | offset++; | |
589 | ||
590 | if (resp->data[offset] == DIGITAL_CMD_PSL_REQ) | |
591 | digital_tg_recv_psl_req(ddev, arg, resp); | |
592 | else | |
593 | digital_tg_recv_dep_req(ddev, arg, resp); | |
594 | } | |
595 | ||
596 | static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev, | |
597 | struct digital_atr_req *atr_req) | |
598 | { | |
599 | struct digital_atr_res *atr_res; | |
600 | struct sk_buff *skb; | |
601 | u8 *gb; | |
602 | size_t gb_len; | |
603 | int rc; | |
604 | ||
605 | gb = nfc_get_local_general_bytes(ddev->nfc_dev, &gb_len); | |
606 | if (!gb) | |
607 | gb_len = 0; | |
608 | ||
609 | skb = digital_skb_alloc(ddev, sizeof(struct digital_atr_res) + gb_len); | |
610 | if (!skb) | |
611 | return -ENOMEM; | |
612 | ||
613 | skb_put(skb, sizeof(struct digital_atr_res)); | |
614 | atr_res = (struct digital_atr_res *)skb->data; | |
615 | ||
616 | memset(atr_res, 0, sizeof(struct digital_atr_res)); | |
617 | ||
618 | atr_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
619 | atr_res->cmd = DIGITAL_CMD_ATR_RES; | |
620 | memcpy(atr_res->nfcid3, atr_req->nfcid3, sizeof(atr_req->nfcid3)); | |
621 | atr_res->to = 8; | |
622 | atr_res->pp = DIGITAL_LR_BITS_PAYLOAD_SIZE_254B; | |
623 | if (gb_len) { | |
624 | skb_put(skb, gb_len); | |
625 | ||
626 | atr_res->pp |= DIGITAL_GB_BIT; | |
627 | memcpy(atr_res->gb, gb, gb_len); | |
628 | } | |
629 | ||
630 | digital_skb_push_dep_sod(ddev, skb); | |
631 | ||
632 | ddev->skb_add_crc(skb); | |
633 | ||
634 | rc = digital_tg_send_cmd(ddev, skb, 999, | |
635 | digital_tg_send_atr_res_complete, NULL); | |
636 | if (rc) { | |
637 | kfree_skb(skb); | |
638 | return rc; | |
639 | } | |
640 | ||
641 | return rc; | |
642 | } | |
643 | ||
644 | void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg, | |
645 | struct sk_buff *resp) | |
646 | { | |
647 | int rc; | |
648 | struct digital_atr_req *atr_req; | |
649 | size_t gb_len, min_size; | |
650 | ||
651 | if (IS_ERR(resp)) { | |
652 | rc = PTR_ERR(resp); | |
653 | resp = NULL; | |
654 | goto exit; | |
655 | } | |
656 | ||
657 | if (!resp->len) { | |
658 | rc = -EIO; | |
659 | goto exit; | |
660 | } | |
661 | ||
662 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) { | |
663 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 2; | |
664 | ||
665 | ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_106A; | |
666 | ddev->skb_add_crc = digital_skb_add_crc_a; | |
667 | ddev->skb_check_crc = digital_skb_check_crc_a; | |
668 | } else { | |
669 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 1; | |
670 | ||
671 | ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_212F; | |
672 | ddev->skb_add_crc = digital_skb_add_crc_f; | |
673 | ddev->skb_check_crc = digital_skb_check_crc_f; | |
674 | } | |
675 | ||
676 | if (resp->len < min_size) { | |
677 | rc = -EIO; | |
678 | goto exit; | |
679 | } | |
680 | ||
681 | if (DIGITAL_DRV_CAPS_TG_CRC(ddev)) { | |
682 | ddev->skb_add_crc = digital_skb_add_crc_none; | |
683 | ddev->skb_check_crc = digital_skb_check_crc_none; | |
684 | } | |
685 | ||
686 | rc = ddev->skb_check_crc(resp); | |
687 | if (rc) { | |
688 | PROTOCOL_ERR("14.4.1.6"); | |
689 | goto exit; | |
690 | } | |
691 | ||
692 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
693 | if (rc) { | |
694 | PROTOCOL_ERR("14.4.1.2"); | |
695 | goto exit; | |
696 | } | |
697 | ||
698 | atr_req = (struct digital_atr_req *)resp->data; | |
699 | ||
700 | if (atr_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
701 | atr_req->cmd != DIGITAL_CMD_ATR_REQ) { | |
702 | rc = -EINVAL; | |
703 | goto exit; | |
704 | } | |
705 | ||
706 | rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, | |
707 | NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED); | |
708 | if (rc) | |
709 | goto exit; | |
710 | ||
711 | rc = digital_tg_send_atr_res(ddev, atr_req); | |
712 | if (rc) | |
713 | goto exit; | |
714 | ||
715 | gb_len = resp->len - sizeof(struct digital_atr_req); | |
716 | rc = nfc_tm_activated(ddev->nfc_dev, NFC_PROTO_NFC_DEP_MASK, | |
717 | NFC_COMM_PASSIVE, atr_req->gb, gb_len); | |
718 | if (rc) | |
719 | goto exit; | |
720 | ||
721 | ddev->poll_tech_count = 0; | |
722 | ||
723 | rc = 0; | |
724 | exit: | |
725 | if (rc) | |
726 | digital_poll_next_tech(ddev); | |
727 | ||
728 | dev_kfree_skb(resp); | |
729 | } |