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Commit | Line | Data |
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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 | ||
7d0911c0 TE |
35 | #define DIGITAL_LR_BITS_PAYLOAD_SIZE_254B 0x30 |
36 | #define DIGITAL_GB_BIT 0x02 | |
37 | ||
38 | #define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0) | |
39 | ||
40 | #define DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT 0x10 | |
41 | ||
42 | #define DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb) \ | |
43 | ((pfb) & DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT) | |
44 | #define DIGITAL_NFC_DEP_MI_BIT_SET(pfb) ((pfb) & 0x10) | |
45 | #define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08) | |
46 | #define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & 0x04) | |
47 | #define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03) | |
48 | ||
49 | #define DIGITAL_NFC_DEP_PFB_I_PDU 0x00 | |
50 | #define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40 | |
51 | #define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80 | |
52 | ||
53 | struct digital_atr_req { | |
54 | u8 dir; | |
55 | u8 cmd; | |
56 | u8 nfcid3[10]; | |
57 | u8 did; | |
58 | u8 bs; | |
59 | u8 br; | |
60 | u8 pp; | |
61 | u8 gb[0]; | |
62 | } __packed; | |
63 | ||
64 | struct digital_atr_res { | |
65 | u8 dir; | |
66 | u8 cmd; | |
67 | u8 nfcid3[10]; | |
68 | u8 did; | |
69 | u8 bs; | |
70 | u8 br; | |
71 | u8 to; | |
72 | u8 pp; | |
73 | u8 gb[0]; | |
74 | } __packed; | |
75 | ||
76 | struct digital_psl_req { | |
77 | u8 dir; | |
78 | u8 cmd; | |
79 | u8 did; | |
80 | u8 brs; | |
81 | u8 fsl; | |
82 | } __packed; | |
83 | ||
84 | struct digital_psl_res { | |
85 | u8 dir; | |
86 | u8 cmd; | |
87 | u8 did; | |
88 | } __packed; | |
89 | ||
90 | struct digital_dep_req_res { | |
91 | u8 dir; | |
92 | u8 cmd; | |
93 | u8 pfb; | |
94 | } __packed; | |
95 | ||
96 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, | |
97 | struct sk_buff *resp); | |
98 | ||
99 | static void digital_skb_push_dep_sod(struct nfc_digital_dev *ddev, | |
100 | struct sk_buff *skb) | |
101 | { | |
102 | skb_push(skb, sizeof(u8)); | |
103 | ||
104 | skb->data[0] = skb->len; | |
105 | ||
106 | if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) | |
107 | *skb_push(skb, sizeof(u8)) = DIGITAL_NFC_DEP_NFCA_SOD_SB; | |
108 | } | |
109 | ||
110 | static int digital_skb_pull_dep_sod(struct nfc_digital_dev *ddev, | |
111 | struct sk_buff *skb) | |
112 | { | |
113 | u8 size; | |
114 | ||
115 | if (skb->len < 2) | |
116 | return -EIO; | |
117 | ||
118 | if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) | |
119 | skb_pull(skb, sizeof(u8)); | |
120 | ||
121 | size = skb->data[0]; | |
122 | if (size != skb->len) | |
123 | return -EIO; | |
124 | ||
125 | skb_pull(skb, sizeof(u8)); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg, | |
131 | struct sk_buff *resp) | |
132 | { | |
133 | struct nfc_target *target = arg; | |
134 | struct digital_atr_res *atr_res; | |
135 | u8 gb_len; | |
136 | int rc; | |
137 | ||
138 | if (IS_ERR(resp)) { | |
139 | rc = PTR_ERR(resp); | |
140 | resp = NULL; | |
141 | goto exit; | |
142 | } | |
143 | ||
144 | rc = ddev->skb_check_crc(resp); | |
145 | if (rc) { | |
146 | PROTOCOL_ERR("14.4.1.6"); | |
147 | goto exit; | |
148 | } | |
149 | ||
150 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
151 | if (rc) { | |
152 | PROTOCOL_ERR("14.4.1.2"); | |
153 | goto exit; | |
154 | } | |
155 | ||
156 | if (resp->len < sizeof(struct digital_atr_res)) { | |
157 | rc = -EIO; | |
158 | goto exit; | |
159 | } | |
160 | ||
161 | gb_len = resp->len - sizeof(struct digital_atr_res); | |
162 | ||
163 | atr_res = (struct digital_atr_res *)resp->data; | |
164 | ||
165 | rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len); | |
166 | if (rc) | |
167 | goto exit; | |
168 | ||
169 | rc = nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, | |
170 | NFC_RF_INITIATOR); | |
171 | ||
172 | ddev->curr_nfc_dep_pni = 0; | |
173 | ||
174 | exit: | |
175 | dev_kfree_skb(resp); | |
176 | ||
177 | if (rc) | |
178 | ddev->curr_protocol = 0; | |
179 | } | |
180 | ||
181 | int digital_in_send_atr_req(struct nfc_digital_dev *ddev, | |
182 | struct nfc_target *target, __u8 comm_mode, __u8 *gb, | |
183 | size_t gb_len) | |
184 | { | |
185 | struct sk_buff *skb; | |
186 | struct digital_atr_req *atr_req; | |
187 | uint size; | |
188 | ||
189 | size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len; | |
190 | ||
191 | if (size > DIGITAL_ATR_REQ_MAX_SIZE) { | |
192 | PROTOCOL_ERR("14.6.1.1"); | |
193 | return -EINVAL; | |
194 | } | |
195 | ||
196 | skb = digital_skb_alloc(ddev, size); | |
197 | if (!skb) | |
198 | return -ENOMEM; | |
199 | ||
200 | skb_put(skb, sizeof(struct digital_atr_req)); | |
201 | ||
202 | atr_req = (struct digital_atr_req *)skb->data; | |
203 | memset(atr_req, 0, sizeof(struct digital_atr_req)); | |
204 | ||
205 | atr_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
206 | atr_req->cmd = DIGITAL_CMD_ATR_REQ; | |
207 | if (target->nfcid2_len) | |
4f319e32 | 208 | memcpy(atr_req->nfcid3, target->nfcid2, NFC_NFCID2_MAXSIZE); |
7d0911c0 | 209 | else |
4f319e32 | 210 | get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE); |
7d0911c0 TE |
211 | |
212 | atr_req->did = 0; | |
213 | atr_req->bs = 0; | |
214 | atr_req->br = 0; | |
215 | ||
216 | atr_req->pp = DIGITAL_LR_BITS_PAYLOAD_SIZE_254B; | |
217 | ||
218 | if (gb_len) { | |
219 | atr_req->pp |= DIGITAL_GB_BIT; | |
220 | memcpy(skb_put(skb, gb_len), gb, gb_len); | |
221 | } | |
222 | ||
223 | digital_skb_push_dep_sod(ddev, skb); | |
224 | ||
225 | ddev->skb_add_crc(skb); | |
226 | ||
227 | digital_in_send_cmd(ddev, skb, 500, digital_in_recv_atr_res, target); | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
232 | static int digital_in_send_rtox(struct nfc_digital_dev *ddev, | |
233 | struct digital_data_exch *data_exch, u8 rtox) | |
234 | { | |
235 | struct digital_dep_req_res *dep_req; | |
236 | struct sk_buff *skb; | |
237 | int rc; | |
238 | ||
239 | skb = digital_skb_alloc(ddev, 1); | |
240 | if (!skb) | |
241 | return -ENOMEM; | |
242 | ||
243 | *skb_put(skb, 1) = rtox; | |
244 | ||
245 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
246 | ||
247 | dep_req = (struct digital_dep_req_res *)skb->data; | |
248 | ||
249 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
250 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
251 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU | | |
252 | DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT; | |
253 | ||
254 | digital_skb_push_dep_sod(ddev, skb); | |
255 | ||
256 | ddev->skb_add_crc(skb); | |
257 | ||
258 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, | |
259 | data_exch); | |
260 | ||
261 | return rc; | |
262 | } | |
263 | ||
264 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, | |
265 | struct sk_buff *resp) | |
266 | { | |
267 | struct digital_data_exch *data_exch = arg; | |
268 | struct digital_dep_req_res *dep_res; | |
269 | u8 pfb; | |
270 | uint size; | |
271 | int rc; | |
272 | ||
273 | if (IS_ERR(resp)) { | |
274 | rc = PTR_ERR(resp); | |
275 | resp = NULL; | |
276 | goto exit; | |
277 | } | |
278 | ||
279 | rc = ddev->skb_check_crc(resp); | |
280 | if (rc) { | |
281 | PROTOCOL_ERR("14.4.1.6"); | |
282 | goto error; | |
283 | } | |
284 | ||
285 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
286 | if (rc) { | |
287 | PROTOCOL_ERR("14.4.1.2"); | |
288 | goto exit; | |
289 | } | |
290 | ||
291 | dep_res = (struct digital_dep_req_res *)resp->data; | |
292 | ||
293 | if (resp->len < sizeof(struct digital_dep_req_res) || | |
294 | dep_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN || | |
295 | dep_res->cmd != DIGITAL_CMD_DEP_RES) { | |
296 | rc = -EIO; | |
297 | goto error; | |
298 | } | |
299 | ||
300 | pfb = dep_res->pfb; | |
301 | ||
302 | switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { | |
303 | case DIGITAL_NFC_DEP_PFB_I_PDU: | |
304 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { | |
305 | PROTOCOL_ERR("14.12.3.3"); | |
306 | rc = -EIO; | |
307 | goto error; | |
308 | } | |
309 | ||
310 | ddev->curr_nfc_dep_pni = | |
311 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
312 | rc = 0; | |
313 | break; | |
314 | ||
315 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: | |
26042530 | 316 | pr_err("Received a ACK/NACK PDU\n"); |
7d0911c0 TE |
317 | rc = -EIO; |
318 | goto error; | |
319 | ||
320 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: | |
321 | if (!DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { | |
322 | rc = -EINVAL; | |
323 | goto error; | |
324 | } | |
325 | ||
326 | rc = digital_in_send_rtox(ddev, data_exch, resp->data[3]); | |
327 | if (rc) | |
328 | goto error; | |
329 | ||
330 | kfree_skb(resp); | |
331 | return; | |
332 | } | |
333 | ||
334 | if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb)) { | |
26042530 | 335 | pr_err("MI bit set. Chained PDU not supported\n"); |
7d0911c0 TE |
336 | rc = -EIO; |
337 | goto error; | |
338 | } | |
339 | ||
340 | size = sizeof(struct digital_dep_req_res); | |
341 | ||
342 | if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) | |
343 | size++; | |
344 | ||
345 | if (size > resp->len) { | |
346 | rc = -EIO; | |
347 | goto error; | |
348 | } | |
349 | ||
350 | skb_pull(resp, size); | |
351 | ||
352 | exit: | |
353 | data_exch->cb(data_exch->cb_context, resp, rc); | |
354 | ||
355 | error: | |
356 | kfree(data_exch); | |
357 | ||
358 | if (rc) | |
359 | kfree_skb(resp); | |
360 | } | |
361 | ||
362 | int digital_in_send_dep_req(struct nfc_digital_dev *ddev, | |
363 | struct nfc_target *target, struct sk_buff *skb, | |
364 | struct digital_data_exch *data_exch) | |
365 | { | |
366 | struct digital_dep_req_res *dep_req; | |
367 | ||
368 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
369 | ||
370 | dep_req = (struct digital_dep_req_res *)skb->data; | |
371 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
372 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
373 | dep_req->pfb = ddev->curr_nfc_dep_pni; | |
374 | ||
375 | digital_skb_push_dep_sod(ddev, skb); | |
376 | ||
377 | ddev->skb_add_crc(skb); | |
378 | ||
379 | return digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, | |
380 | data_exch); | |
381 | } | |
1c7a4c24 TE |
382 | |
383 | static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, | |
384 | struct sk_buff *resp) | |
385 | { | |
386 | int rc; | |
387 | struct digital_dep_req_res *dep_req; | |
388 | size_t size; | |
389 | ||
390 | if (IS_ERR(resp)) { | |
391 | rc = PTR_ERR(resp); | |
392 | resp = NULL; | |
393 | goto exit; | |
394 | } | |
395 | ||
396 | rc = ddev->skb_check_crc(resp); | |
397 | if (rc) { | |
398 | PROTOCOL_ERR("14.4.1.6"); | |
399 | goto exit; | |
400 | } | |
401 | ||
402 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
403 | if (rc) { | |
404 | PROTOCOL_ERR("14.4.1.2"); | |
405 | goto exit; | |
406 | } | |
407 | ||
408 | size = sizeof(struct digital_dep_req_res); | |
409 | dep_req = (struct digital_dep_req_res *)resp->data; | |
410 | ||
411 | if (resp->len < size || dep_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
412 | dep_req->cmd != DIGITAL_CMD_DEP_REQ) { | |
413 | rc = -EIO; | |
414 | goto exit; | |
415 | } | |
416 | ||
417 | if (DIGITAL_NFC_DEP_DID_BIT_SET(dep_req->pfb)) | |
418 | size++; | |
419 | ||
420 | if (resp->len < size) { | |
421 | rc = -EIO; | |
422 | goto exit; | |
423 | } | |
424 | ||
425 | switch (DIGITAL_NFC_DEP_PFB_TYPE(dep_req->pfb)) { | |
426 | case DIGITAL_NFC_DEP_PFB_I_PDU: | |
26042530 | 427 | pr_debug("DIGITAL_NFC_DEP_PFB_I_PDU\n"); |
1c7a4c24 TE |
428 | ddev->curr_nfc_dep_pni = DIGITAL_NFC_DEP_PFB_PNI(dep_req->pfb); |
429 | break; | |
430 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: | |
26042530 | 431 | pr_err("Received a ACK/NACK PDU\n"); |
1c7a4c24 TE |
432 | rc = -EINVAL; |
433 | goto exit; | |
434 | break; | |
435 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: | |
26042530 | 436 | pr_err("Received a SUPERVISOR PDU\n"); |
1c7a4c24 TE |
437 | rc = -EINVAL; |
438 | goto exit; | |
439 | break; | |
440 | } | |
441 | ||
442 | skb_pull(resp, size); | |
443 | ||
444 | rc = nfc_tm_data_received(ddev->nfc_dev, resp); | |
445 | ||
446 | exit: | |
447 | if (rc) | |
448 | kfree_skb(resp); | |
449 | } | |
450 | ||
451 | int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb) | |
452 | { | |
453 | struct digital_dep_req_res *dep_res; | |
454 | ||
455 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
456 | dep_res = (struct digital_dep_req_res *)skb->data; | |
457 | ||
458 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
459 | dep_res->cmd = DIGITAL_CMD_DEP_RES; | |
460 | dep_res->pfb = ddev->curr_nfc_dep_pni; | |
461 | ||
462 | digital_skb_push_dep_sod(ddev, skb); | |
463 | ||
464 | ddev->skb_add_crc(skb); | |
465 | ||
466 | return digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, | |
467 | NULL); | |
468 | } | |
469 | ||
470 | static void digital_tg_send_psl_res_complete(struct nfc_digital_dev *ddev, | |
471 | void *arg, struct sk_buff *resp) | |
472 | { | |
67af1d7a | 473 | u8 rf_tech = (unsigned long)arg; |
1c7a4c24 TE |
474 | |
475 | if (IS_ERR(resp)) | |
476 | return; | |
477 | ||
478 | digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); | |
479 | ||
480 | digital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL); | |
481 | ||
482 | dev_kfree_skb(resp); | |
483 | } | |
484 | ||
485 | static int digital_tg_send_psl_res(struct nfc_digital_dev *ddev, u8 did, | |
486 | u8 rf_tech) | |
487 | { | |
488 | struct digital_psl_res *psl_res; | |
489 | struct sk_buff *skb; | |
490 | int rc; | |
491 | ||
492 | skb = digital_skb_alloc(ddev, sizeof(struct digital_psl_res)); | |
493 | if (!skb) | |
494 | return -ENOMEM; | |
495 | ||
496 | skb_put(skb, sizeof(struct digital_psl_res)); | |
497 | ||
498 | psl_res = (struct digital_psl_res *)skb->data; | |
499 | ||
500 | psl_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
501 | psl_res->cmd = DIGITAL_CMD_PSL_RES; | |
502 | psl_res->did = did; | |
503 | ||
504 | digital_skb_push_dep_sod(ddev, skb); | |
505 | ||
506 | ddev->skb_add_crc(skb); | |
507 | ||
508 | rc = digital_tg_send_cmd(ddev, skb, 0, digital_tg_send_psl_res_complete, | |
67af1d7a | 509 | (void *)(unsigned long)rf_tech); |
1c7a4c24 TE |
510 | |
511 | if (rc) | |
512 | kfree_skb(skb); | |
513 | ||
514 | return rc; | |
515 | } | |
516 | ||
517 | static void digital_tg_recv_psl_req(struct nfc_digital_dev *ddev, void *arg, | |
518 | struct sk_buff *resp) | |
519 | { | |
520 | int rc; | |
521 | struct digital_psl_req *psl_req; | |
522 | u8 rf_tech; | |
523 | u8 dsi; | |
524 | ||
525 | if (IS_ERR(resp)) { | |
526 | rc = PTR_ERR(resp); | |
527 | resp = NULL; | |
528 | goto exit; | |
529 | } | |
530 | ||
531 | rc = ddev->skb_check_crc(resp); | |
532 | if (rc) { | |
533 | PROTOCOL_ERR("14.4.1.6"); | |
534 | goto exit; | |
535 | } | |
536 | ||
537 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
538 | if (rc) { | |
539 | PROTOCOL_ERR("14.4.1.2"); | |
540 | goto exit; | |
541 | } | |
542 | ||
543 | psl_req = (struct digital_psl_req *)resp->data; | |
544 | ||
545 | if (resp->len != sizeof(struct digital_psl_req) || | |
546 | psl_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
547 | psl_req->cmd != DIGITAL_CMD_PSL_REQ) { | |
548 | rc = -EIO; | |
549 | goto exit; | |
550 | } | |
551 | ||
552 | dsi = (psl_req->brs >> 3) & 0x07; | |
553 | switch (dsi) { | |
554 | case 0: | |
555 | rf_tech = NFC_DIGITAL_RF_TECH_106A; | |
556 | break; | |
557 | case 1: | |
558 | rf_tech = NFC_DIGITAL_RF_TECH_212F; | |
559 | break; | |
560 | case 2: | |
561 | rf_tech = NFC_DIGITAL_RF_TECH_424F; | |
562 | break; | |
563 | default: | |
26042530 | 564 | pr_err("Unsuported dsi value %d\n", dsi); |
1c7a4c24 TE |
565 | goto exit; |
566 | } | |
567 | ||
568 | rc = digital_tg_send_psl_res(ddev, psl_req->did, rf_tech); | |
569 | ||
570 | exit: | |
571 | kfree_skb(resp); | |
572 | } | |
573 | ||
574 | static void digital_tg_send_atr_res_complete(struct nfc_digital_dev *ddev, | |
575 | void *arg, struct sk_buff *resp) | |
576 | { | |
577 | int offset; | |
578 | ||
579 | if (IS_ERR(resp)) { | |
580 | digital_poll_next_tech(ddev); | |
581 | return; | |
582 | } | |
583 | ||
584 | offset = 2; | |
585 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) | |
586 | offset++; | |
587 | ||
588 | if (resp->data[offset] == DIGITAL_CMD_PSL_REQ) | |
589 | digital_tg_recv_psl_req(ddev, arg, resp); | |
590 | else | |
591 | digital_tg_recv_dep_req(ddev, arg, resp); | |
592 | } | |
593 | ||
594 | static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev, | |
595 | struct digital_atr_req *atr_req) | |
596 | { | |
597 | struct digital_atr_res *atr_res; | |
598 | struct sk_buff *skb; | |
599 | u8 *gb; | |
600 | size_t gb_len; | |
601 | int rc; | |
602 | ||
603 | gb = nfc_get_local_general_bytes(ddev->nfc_dev, &gb_len); | |
604 | if (!gb) | |
605 | gb_len = 0; | |
606 | ||
607 | skb = digital_skb_alloc(ddev, sizeof(struct digital_atr_res) + gb_len); | |
608 | if (!skb) | |
609 | return -ENOMEM; | |
610 | ||
611 | skb_put(skb, sizeof(struct digital_atr_res)); | |
612 | atr_res = (struct digital_atr_res *)skb->data; | |
613 | ||
614 | memset(atr_res, 0, sizeof(struct digital_atr_res)); | |
615 | ||
616 | atr_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
617 | atr_res->cmd = DIGITAL_CMD_ATR_RES; | |
618 | memcpy(atr_res->nfcid3, atr_req->nfcid3, sizeof(atr_req->nfcid3)); | |
619 | atr_res->to = 8; | |
620 | atr_res->pp = DIGITAL_LR_BITS_PAYLOAD_SIZE_254B; | |
621 | if (gb_len) { | |
622 | skb_put(skb, gb_len); | |
623 | ||
624 | atr_res->pp |= DIGITAL_GB_BIT; | |
625 | memcpy(atr_res->gb, gb, gb_len); | |
626 | } | |
627 | ||
628 | digital_skb_push_dep_sod(ddev, skb); | |
629 | ||
630 | ddev->skb_add_crc(skb); | |
631 | ||
632 | rc = digital_tg_send_cmd(ddev, skb, 999, | |
633 | digital_tg_send_atr_res_complete, NULL); | |
634 | if (rc) { | |
635 | kfree_skb(skb); | |
636 | return rc; | |
637 | } | |
638 | ||
639 | return rc; | |
640 | } | |
641 | ||
642 | void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg, | |
643 | struct sk_buff *resp) | |
644 | { | |
645 | int rc; | |
646 | struct digital_atr_req *atr_req; | |
647 | size_t gb_len, min_size; | |
648 | ||
649 | if (IS_ERR(resp)) { | |
650 | rc = PTR_ERR(resp); | |
651 | resp = NULL; | |
652 | goto exit; | |
653 | } | |
654 | ||
655 | if (!resp->len) { | |
656 | rc = -EIO; | |
657 | goto exit; | |
658 | } | |
659 | ||
660 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) { | |
661 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 2; | |
662 | ||
663 | ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_106A; | |
664 | ddev->skb_add_crc = digital_skb_add_crc_a; | |
665 | ddev->skb_check_crc = digital_skb_check_crc_a; | |
666 | } else { | |
667 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 1; | |
668 | ||
669 | ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_212F; | |
670 | ddev->skb_add_crc = digital_skb_add_crc_f; | |
671 | ddev->skb_check_crc = digital_skb_check_crc_f; | |
672 | } | |
673 | ||
674 | if (resp->len < min_size) { | |
675 | rc = -EIO; | |
676 | goto exit; | |
677 | } | |
678 | ||
679 | if (DIGITAL_DRV_CAPS_TG_CRC(ddev)) { | |
680 | ddev->skb_add_crc = digital_skb_add_crc_none; | |
681 | ddev->skb_check_crc = digital_skb_check_crc_none; | |
682 | } | |
683 | ||
684 | rc = ddev->skb_check_crc(resp); | |
685 | if (rc) { | |
686 | PROTOCOL_ERR("14.4.1.6"); | |
687 | goto exit; | |
688 | } | |
689 | ||
690 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
691 | if (rc) { | |
692 | PROTOCOL_ERR("14.4.1.2"); | |
693 | goto exit; | |
694 | } | |
695 | ||
696 | atr_req = (struct digital_atr_req *)resp->data; | |
697 | ||
698 | if (atr_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
699 | atr_req->cmd != DIGITAL_CMD_ATR_REQ) { | |
700 | rc = -EINVAL; | |
701 | goto exit; | |
702 | } | |
703 | ||
704 | rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, | |
705 | NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED); | |
706 | if (rc) | |
707 | goto exit; | |
708 | ||
709 | rc = digital_tg_send_atr_res(ddev, atr_req); | |
710 | if (rc) | |
711 | goto exit; | |
712 | ||
713 | gb_len = resp->len - sizeof(struct digital_atr_req); | |
714 | rc = nfc_tm_activated(ddev->nfc_dev, NFC_PROTO_NFC_DEP_MASK, | |
715 | NFC_COMM_PASSIVE, atr_req->gb, gb_len); | |
716 | if (rc) | |
717 | goto exit; | |
718 | ||
719 | ddev->poll_tech_count = 0; | |
720 | ||
721 | rc = 0; | |
722 | exit: | |
723 | if (rc) | |
724 | digital_poll_next_tech(ddev); | |
725 | ||
726 | dev_kfree_skb(resp); | |
727 | } |