]>
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 | ||
05afedcb MG |
35 | #define DIGITAL_DID_MAX 14 |
36 | ||
b08147cb MG |
37 | #define DIGITAL_PAYLOAD_SIZE_MAX 254 |
38 | #define DIGITAL_PAYLOAD_BITS_TO_PP(s) (((s) & 0x3) << 4) | |
39 | #define DIGITAL_PAYLOAD_PP_TO_BITS(s) (((s) >> 4) & 0x3) | |
40 | #define DIGITAL_PAYLOAD_BITS_TO_FSL(s) ((s) & 0x3) | |
41 | #define DIGITAL_PAYLOAD_FSL_TO_BITS(s) ((s) & 0x3) | |
42 | ||
7d0911c0 TE |
43 | #define DIGITAL_GB_BIT 0x02 |
44 | ||
45 | #define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0) | |
46 | ||
47 | #define DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT 0x10 | |
05afedcb | 48 | #define DIGITAL_NFC_DEP_PFB_DID_BIT 0x04 |
7d0911c0 TE |
49 | |
50 | #define DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb) \ | |
51 | ((pfb) & DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT) | |
52 | #define DIGITAL_NFC_DEP_MI_BIT_SET(pfb) ((pfb) & 0x10) | |
53 | #define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08) | |
05afedcb | 54 | #define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_DID_BIT) |
7d0911c0 TE |
55 | #define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03) |
56 | ||
57 | #define DIGITAL_NFC_DEP_PFB_I_PDU 0x00 | |
58 | #define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40 | |
59 | #define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80 | |
60 | ||
61 | struct digital_atr_req { | |
62 | u8 dir; | |
63 | u8 cmd; | |
64 | u8 nfcid3[10]; | |
65 | u8 did; | |
66 | u8 bs; | |
67 | u8 br; | |
68 | u8 pp; | |
69 | u8 gb[0]; | |
70 | } __packed; | |
71 | ||
72 | struct digital_atr_res { | |
73 | u8 dir; | |
74 | u8 cmd; | |
75 | u8 nfcid3[10]; | |
76 | u8 did; | |
77 | u8 bs; | |
78 | u8 br; | |
79 | u8 to; | |
80 | u8 pp; | |
81 | u8 gb[0]; | |
82 | } __packed; | |
83 | ||
84 | struct digital_psl_req { | |
85 | u8 dir; | |
86 | u8 cmd; | |
87 | u8 did; | |
88 | u8 brs; | |
89 | u8 fsl; | |
90 | } __packed; | |
91 | ||
92 | struct digital_psl_res { | |
93 | u8 dir; | |
94 | u8 cmd; | |
95 | u8 did; | |
96 | } __packed; | |
97 | ||
98 | struct digital_dep_req_res { | |
99 | u8 dir; | |
100 | u8 cmd; | |
101 | u8 pfb; | |
102 | } __packed; | |
103 | ||
104 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, | |
105 | struct sk_buff *resp); | |
106 | ||
b08147cb MG |
107 | static const u8 digital_payload_bits_map[4] = { |
108 | [0] = 64, | |
109 | [1] = 128, | |
110 | [2] = 192, | |
111 | [3] = 254 | |
112 | }; | |
113 | ||
114 | static u8 digital_payload_bits_to_size(u8 payload_bits) | |
115 | { | |
116 | if (payload_bits >= ARRAY_SIZE(digital_payload_bits_map)) | |
117 | return 0; | |
118 | ||
119 | return digital_payload_bits_map[payload_bits]; | |
120 | } | |
121 | ||
122 | static u8 digital_payload_size_to_bits(u8 payload_size) | |
123 | { | |
124 | int i; | |
125 | ||
126 | for (i = 0; i < ARRAY_SIZE(digital_payload_bits_map); i++) | |
127 | if (digital_payload_bits_map[i] == payload_size) | |
128 | return i; | |
129 | ||
130 | return 0xff; | |
131 | } | |
132 | ||
7d0911c0 TE |
133 | static void digital_skb_push_dep_sod(struct nfc_digital_dev *ddev, |
134 | struct sk_buff *skb) | |
135 | { | |
136 | skb_push(skb, sizeof(u8)); | |
137 | ||
138 | skb->data[0] = skb->len; | |
139 | ||
140 | if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) | |
141 | *skb_push(skb, sizeof(u8)) = DIGITAL_NFC_DEP_NFCA_SOD_SB; | |
142 | } | |
143 | ||
144 | static int digital_skb_pull_dep_sod(struct nfc_digital_dev *ddev, | |
145 | struct sk_buff *skb) | |
146 | { | |
147 | u8 size; | |
148 | ||
149 | if (skb->len < 2) | |
150 | return -EIO; | |
151 | ||
152 | if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) | |
153 | skb_pull(skb, sizeof(u8)); | |
154 | ||
155 | size = skb->data[0]; | |
156 | if (size != skb->len) | |
157 | return -EIO; | |
158 | ||
159 | skb_pull(skb, sizeof(u8)); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
dddb3da0 MG |
164 | static void digital_in_recv_psl_res(struct nfc_digital_dev *ddev, void *arg, |
165 | struct sk_buff *resp) | |
166 | { | |
167 | struct nfc_target *target = arg; | |
168 | struct digital_psl_res *psl_res; | |
169 | int rc; | |
170 | ||
171 | if (IS_ERR(resp)) { | |
172 | rc = PTR_ERR(resp); | |
173 | resp = NULL; | |
174 | goto exit; | |
175 | } | |
176 | ||
177 | rc = ddev->skb_check_crc(resp); | |
178 | if (rc) { | |
179 | PROTOCOL_ERR("14.4.1.6"); | |
180 | goto exit; | |
181 | } | |
182 | ||
183 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
184 | if (rc) { | |
185 | PROTOCOL_ERR("14.4.1.2"); | |
186 | goto exit; | |
187 | } | |
188 | ||
189 | psl_res = (struct digital_psl_res *)resp->data; | |
190 | ||
191 | if ((resp->len != sizeof(*psl_res)) || | |
192 | (psl_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN) || | |
193 | (psl_res->cmd != DIGITAL_CMD_PSL_RES)) { | |
194 | rc = -EIO; | |
195 | goto exit; | |
196 | } | |
197 | ||
198 | rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, | |
199 | NFC_DIGITAL_RF_TECH_424F); | |
200 | if (rc) | |
201 | goto exit; | |
202 | ||
203 | rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, | |
204 | NFC_DIGITAL_FRAMING_NFCF_NFC_DEP); | |
205 | if (rc) | |
206 | goto exit; | |
207 | ||
208 | if (!DIGITAL_DRV_CAPS_IN_CRC(ddev) && | |
209 | (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)) { | |
210 | ddev->skb_add_crc = digital_skb_add_crc_f; | |
211 | ddev->skb_check_crc = digital_skb_check_crc_f; | |
212 | } | |
213 | ||
214 | ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_424F; | |
215 | ||
216 | nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, | |
217 | NFC_RF_INITIATOR); | |
218 | ||
219 | ddev->curr_nfc_dep_pni = 0; | |
220 | ||
221 | exit: | |
222 | dev_kfree_skb(resp); | |
223 | ||
224 | if (rc) | |
225 | ddev->curr_protocol = 0; | |
226 | } | |
227 | ||
228 | static int digital_in_send_psl_req(struct nfc_digital_dev *ddev, | |
229 | struct nfc_target *target) | |
230 | { | |
231 | struct sk_buff *skb; | |
232 | struct digital_psl_req *psl_req; | |
b15829ba | 233 | int rc; |
b08147cb | 234 | u8 payload_size, payload_bits; |
dddb3da0 MG |
235 | |
236 | skb = digital_skb_alloc(ddev, sizeof(*psl_req)); | |
237 | if (!skb) | |
238 | return -ENOMEM; | |
239 | ||
240 | skb_put(skb, sizeof(*psl_req)); | |
241 | ||
242 | psl_req = (struct digital_psl_req *)skb->data; | |
243 | ||
244 | psl_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
245 | psl_req->cmd = DIGITAL_CMD_PSL_REQ; | |
246 | psl_req->did = 0; | |
247 | psl_req->brs = (0x2 << 3) | 0x2; /* 424F both directions */ | |
b08147cb MG |
248 | |
249 | payload_size = min(ddev->local_payload_max, ddev->remote_payload_max); | |
250 | payload_bits = digital_payload_size_to_bits(payload_size); | |
251 | psl_req->fsl = DIGITAL_PAYLOAD_BITS_TO_FSL(payload_bits); | |
252 | ||
253 | ddev->local_payload_max = payload_size; | |
254 | ddev->remote_payload_max = payload_size; | |
dddb3da0 MG |
255 | |
256 | digital_skb_push_dep_sod(ddev, skb); | |
257 | ||
258 | ddev->skb_add_crc(skb); | |
259 | ||
b15829ba MG |
260 | rc = digital_in_send_cmd(ddev, skb, 500, digital_in_recv_psl_res, |
261 | target); | |
262 | if (rc) | |
263 | kfree_skb(skb); | |
264 | ||
265 | return rc; | |
dddb3da0 MG |
266 | } |
267 | ||
7d0911c0 TE |
268 | static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg, |
269 | struct sk_buff *resp) | |
270 | { | |
271 | struct nfc_target *target = arg; | |
272 | struct digital_atr_res *atr_res; | |
b08147cb | 273 | u8 gb_len, payload_bits; |
7d0911c0 TE |
274 | int rc; |
275 | ||
276 | if (IS_ERR(resp)) { | |
277 | rc = PTR_ERR(resp); | |
278 | resp = NULL; | |
279 | goto exit; | |
280 | } | |
281 | ||
282 | rc = ddev->skb_check_crc(resp); | |
283 | if (rc) { | |
284 | PROTOCOL_ERR("14.4.1.6"); | |
285 | goto exit; | |
286 | } | |
287 | ||
288 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
289 | if (rc) { | |
290 | PROTOCOL_ERR("14.4.1.2"); | |
291 | goto exit; | |
292 | } | |
293 | ||
294 | if (resp->len < sizeof(struct digital_atr_res)) { | |
295 | rc = -EIO; | |
296 | goto exit; | |
297 | } | |
298 | ||
299 | gb_len = resp->len - sizeof(struct digital_atr_res); | |
300 | ||
301 | atr_res = (struct digital_atr_res *)resp->data; | |
302 | ||
b08147cb MG |
303 | payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_res->pp); |
304 | ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); | |
305 | ||
306 | if (!ddev->remote_payload_max) { | |
307 | rc = -EINVAL; | |
308 | goto exit; | |
309 | } | |
310 | ||
7d0911c0 TE |
311 | rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len); |
312 | if (rc) | |
313 | goto exit; | |
314 | ||
dddb3da0 MG |
315 | if ((ddev->protocols & NFC_PROTO_FELICA_MASK) && |
316 | (ddev->curr_rf_tech != NFC_DIGITAL_RF_TECH_424F)) { | |
317 | rc = digital_in_send_psl_req(ddev, target); | |
318 | if (!rc) | |
319 | goto exit; | |
320 | } | |
321 | ||
7d0911c0 TE |
322 | rc = nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, |
323 | NFC_RF_INITIATOR); | |
324 | ||
325 | ddev->curr_nfc_dep_pni = 0; | |
326 | ||
327 | exit: | |
328 | dev_kfree_skb(resp); | |
329 | ||
330 | if (rc) | |
331 | ddev->curr_protocol = 0; | |
332 | } | |
333 | ||
334 | int digital_in_send_atr_req(struct nfc_digital_dev *ddev, | |
335 | struct nfc_target *target, __u8 comm_mode, __u8 *gb, | |
336 | size_t gb_len) | |
337 | { | |
338 | struct sk_buff *skb; | |
339 | struct digital_atr_req *atr_req; | |
340 | uint size; | |
b15829ba | 341 | int rc; |
b08147cb | 342 | u8 payload_bits; |
7d0911c0 TE |
343 | |
344 | size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len; | |
345 | ||
346 | if (size > DIGITAL_ATR_REQ_MAX_SIZE) { | |
347 | PROTOCOL_ERR("14.6.1.1"); | |
348 | return -EINVAL; | |
349 | } | |
350 | ||
351 | skb = digital_skb_alloc(ddev, size); | |
352 | if (!skb) | |
353 | return -ENOMEM; | |
354 | ||
355 | skb_put(skb, sizeof(struct digital_atr_req)); | |
356 | ||
357 | atr_req = (struct digital_atr_req *)skb->data; | |
358 | memset(atr_req, 0, sizeof(struct digital_atr_req)); | |
359 | ||
360 | atr_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
361 | atr_req->cmd = DIGITAL_CMD_ATR_REQ; | |
362 | if (target->nfcid2_len) | |
4f319e32 | 363 | memcpy(atr_req->nfcid3, target->nfcid2, NFC_NFCID2_MAXSIZE); |
7d0911c0 | 364 | else |
4f319e32 | 365 | get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE); |
7d0911c0 TE |
366 | |
367 | atr_req->did = 0; | |
368 | atr_req->bs = 0; | |
369 | atr_req->br = 0; | |
370 | ||
b08147cb MG |
371 | ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; |
372 | payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); | |
373 | atr_req->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); | |
7d0911c0 TE |
374 | |
375 | if (gb_len) { | |
376 | atr_req->pp |= DIGITAL_GB_BIT; | |
377 | memcpy(skb_put(skb, gb_len), gb, gb_len); | |
378 | } | |
379 | ||
380 | digital_skb_push_dep_sod(ddev, skb); | |
381 | ||
382 | ddev->skb_add_crc(skb); | |
383 | ||
b15829ba MG |
384 | rc = digital_in_send_cmd(ddev, skb, 500, digital_in_recv_atr_res, |
385 | target); | |
386 | if (rc) | |
387 | kfree_skb(skb); | |
388 | ||
389 | return rc; | |
7d0911c0 TE |
390 | } |
391 | ||
392 | static int digital_in_send_rtox(struct nfc_digital_dev *ddev, | |
393 | struct digital_data_exch *data_exch, u8 rtox) | |
394 | { | |
395 | struct digital_dep_req_res *dep_req; | |
396 | struct sk_buff *skb; | |
397 | int rc; | |
398 | ||
399 | skb = digital_skb_alloc(ddev, 1); | |
400 | if (!skb) | |
401 | return -ENOMEM; | |
402 | ||
403 | *skb_put(skb, 1) = rtox; | |
404 | ||
405 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
406 | ||
407 | dep_req = (struct digital_dep_req_res *)skb->data; | |
408 | ||
409 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
410 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
411 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU | | |
412 | DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT; | |
413 | ||
414 | digital_skb_push_dep_sod(ddev, skb); | |
415 | ||
416 | ddev->skb_add_crc(skb); | |
417 | ||
418 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, | |
419 | data_exch); | |
b15829ba MG |
420 | if (rc) |
421 | kfree_skb(skb); | |
7d0911c0 TE |
422 | |
423 | return rc; | |
424 | } | |
425 | ||
426 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, | |
427 | struct sk_buff *resp) | |
428 | { | |
429 | struct digital_data_exch *data_exch = arg; | |
430 | struct digital_dep_req_res *dep_res; | |
431 | u8 pfb; | |
432 | uint size; | |
433 | int rc; | |
434 | ||
435 | if (IS_ERR(resp)) { | |
436 | rc = PTR_ERR(resp); | |
437 | resp = NULL; | |
438 | goto exit; | |
439 | } | |
440 | ||
441 | rc = ddev->skb_check_crc(resp); | |
442 | if (rc) { | |
443 | PROTOCOL_ERR("14.4.1.6"); | |
444 | goto error; | |
445 | } | |
446 | ||
447 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
448 | if (rc) { | |
449 | PROTOCOL_ERR("14.4.1.2"); | |
450 | goto exit; | |
451 | } | |
452 | ||
b08147cb MG |
453 | if (resp->len > ddev->local_payload_max) { |
454 | rc = -EMSGSIZE; | |
455 | goto exit; | |
456 | } | |
457 | ||
6ce30668 | 458 | size = sizeof(struct digital_dep_req_res); |
7d0911c0 TE |
459 | dep_res = (struct digital_dep_req_res *)resp->data; |
460 | ||
6ce30668 | 461 | if (resp->len < size || dep_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN || |
7d0911c0 TE |
462 | dep_res->cmd != DIGITAL_CMD_DEP_RES) { |
463 | rc = -EIO; | |
464 | goto error; | |
465 | } | |
466 | ||
467 | pfb = dep_res->pfb; | |
468 | ||
3bc3f88a MG |
469 | if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { |
470 | PROTOCOL_ERR("14.8.2.1"); | |
471 | rc = -EIO; | |
472 | goto error; | |
473 | } | |
6ce30668 | 474 | |
3e6b0de8 MG |
475 | if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) { |
476 | rc = -EIO; | |
477 | goto exit; | |
478 | } | |
479 | ||
6ce30668 MG |
480 | if (size > resp->len) { |
481 | rc = -EIO; | |
482 | goto error; | |
483 | } | |
484 | ||
485 | skb_pull(resp, size); | |
486 | ||
7d0911c0 TE |
487 | switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { |
488 | case DIGITAL_NFC_DEP_PFB_I_PDU: | |
489 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { | |
490 | PROTOCOL_ERR("14.12.3.3"); | |
491 | rc = -EIO; | |
492 | goto error; | |
493 | } | |
494 | ||
495 | ddev->curr_nfc_dep_pni = | |
496 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
497 | rc = 0; | |
498 | break; | |
499 | ||
500 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: | |
26042530 | 501 | pr_err("Received a ACK/NACK PDU\n"); |
485fdc9b MG |
502 | |
503 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { | |
504 | PROTOCOL_ERR("14.12.3.3"); | |
505 | rc = -EIO; | |
506 | goto exit; | |
507 | } | |
508 | ||
509 | ddev->curr_nfc_dep_pni = | |
510 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
511 | ||
512 | rc = -EINVAL; | |
513 | goto exit; | |
7d0911c0 TE |
514 | |
515 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: | |
516 | if (!DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { | |
517 | rc = -EINVAL; | |
518 | goto error; | |
519 | } | |
520 | ||
6ce30668 | 521 | rc = digital_in_send_rtox(ddev, data_exch, resp->data[0]); |
7d0911c0 TE |
522 | if (rc) |
523 | goto error; | |
524 | ||
525 | kfree_skb(resp); | |
526 | return; | |
527 | } | |
528 | ||
529 | if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb)) { | |
26042530 | 530 | pr_err("MI bit set. Chained PDU not supported\n"); |
7d0911c0 TE |
531 | rc = -EIO; |
532 | goto error; | |
533 | } | |
534 | ||
7d0911c0 TE |
535 | exit: |
536 | data_exch->cb(data_exch->cb_context, resp, rc); | |
537 | ||
538 | error: | |
539 | kfree(data_exch); | |
540 | ||
541 | if (rc) | |
542 | kfree_skb(resp); | |
543 | } | |
544 | ||
545 | int digital_in_send_dep_req(struct nfc_digital_dev *ddev, | |
546 | struct nfc_target *target, struct sk_buff *skb, | |
547 | struct digital_data_exch *data_exch) | |
548 | { | |
549 | struct digital_dep_req_res *dep_req; | |
550 | ||
551 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
552 | ||
b08147cb MG |
553 | if (skb->len > ddev->remote_payload_max) |
554 | return -EMSGSIZE; | |
555 | ||
7d0911c0 TE |
556 | dep_req = (struct digital_dep_req_res *)skb->data; |
557 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
558 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
559 | dep_req->pfb = ddev->curr_nfc_dep_pni; | |
560 | ||
561 | digital_skb_push_dep_sod(ddev, skb); | |
562 | ||
563 | ddev->skb_add_crc(skb); | |
564 | ||
565 | return digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, | |
566 | data_exch); | |
567 | } | |
1c7a4c24 | 568 | |
b711ad52 TE |
569 | static void digital_tg_set_rf_tech(struct nfc_digital_dev *ddev, u8 rf_tech) |
570 | { | |
571 | ddev->curr_rf_tech = rf_tech; | |
572 | ||
573 | ddev->skb_add_crc = digital_skb_add_crc_none; | |
574 | ddev->skb_check_crc = digital_skb_check_crc_none; | |
575 | ||
576 | if (DIGITAL_DRV_CAPS_TG_CRC(ddev)) | |
577 | return; | |
578 | ||
579 | switch (ddev->curr_rf_tech) { | |
580 | case NFC_DIGITAL_RF_TECH_106A: | |
581 | ddev->skb_add_crc = digital_skb_add_crc_a; | |
582 | ddev->skb_check_crc = digital_skb_check_crc_a; | |
583 | break; | |
584 | ||
585 | case NFC_DIGITAL_RF_TECH_212F: | |
586 | case NFC_DIGITAL_RF_TECH_424F: | |
587 | ddev->skb_add_crc = digital_skb_add_crc_f; | |
588 | ddev->skb_check_crc = digital_skb_check_crc_f; | |
589 | break; | |
590 | ||
591 | default: | |
592 | break; | |
593 | } | |
594 | } | |
595 | ||
1c7a4c24 TE |
596 | static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, |
597 | struct sk_buff *resp) | |
598 | { | |
599 | int rc; | |
600 | struct digital_dep_req_res *dep_req; | |
6ce30668 | 601 | u8 pfb; |
1c7a4c24 TE |
602 | size_t size; |
603 | ||
604 | if (IS_ERR(resp)) { | |
605 | rc = PTR_ERR(resp); | |
606 | resp = NULL; | |
607 | goto exit; | |
608 | } | |
609 | ||
610 | rc = ddev->skb_check_crc(resp); | |
611 | if (rc) { | |
612 | PROTOCOL_ERR("14.4.1.6"); | |
613 | goto exit; | |
614 | } | |
615 | ||
616 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
617 | if (rc) { | |
618 | PROTOCOL_ERR("14.4.1.2"); | |
619 | goto exit; | |
620 | } | |
621 | ||
b08147cb MG |
622 | if (resp->len > ddev->local_payload_max) { |
623 | rc = -EMSGSIZE; | |
624 | goto exit; | |
625 | } | |
626 | ||
1c7a4c24 TE |
627 | size = sizeof(struct digital_dep_req_res); |
628 | dep_req = (struct digital_dep_req_res *)resp->data; | |
629 | ||
630 | if (resp->len < size || dep_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
631 | dep_req->cmd != DIGITAL_CMD_DEP_REQ) { | |
632 | rc = -EIO; | |
633 | goto exit; | |
634 | } | |
635 | ||
6ce30668 MG |
636 | pfb = dep_req->pfb; |
637 | ||
05afedcb MG |
638 | if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { |
639 | if (ddev->did && (ddev->did == resp->data[3])) { | |
640 | size++; | |
641 | } else { | |
642 | rc = -EIO; | |
643 | goto exit; | |
644 | } | |
645 | } else if (ddev->did) { | |
646 | rc = -EIO; | |
647 | goto exit; | |
648 | } | |
1c7a4c24 | 649 | |
3e6b0de8 MG |
650 | if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) { |
651 | rc = -EIO; | |
652 | goto exit; | |
653 | } | |
654 | ||
6ce30668 | 655 | if (size > resp->len) { |
1c7a4c24 TE |
656 | rc = -EIO; |
657 | goto exit; | |
658 | } | |
659 | ||
6ce30668 MG |
660 | skb_pull(resp, size); |
661 | ||
662 | switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { | |
1c7a4c24 | 663 | case DIGITAL_NFC_DEP_PFB_I_PDU: |
26042530 | 664 | pr_debug("DIGITAL_NFC_DEP_PFB_I_PDU\n"); |
485fdc9b MG |
665 | |
666 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { | |
667 | PROTOCOL_ERR("14.12.3.4"); | |
668 | rc = -EIO; | |
669 | goto exit; | |
670 | } | |
671 | ||
672 | rc = 0; | |
1c7a4c24 TE |
673 | break; |
674 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: | |
485fdc9b MG |
675 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { |
676 | PROTOCOL_ERR("14.12.3.4"); | |
677 | rc = -EIO; | |
678 | goto exit; | |
679 | } | |
680 | ||
26042530 | 681 | pr_err("Received a ACK/NACK PDU\n"); |
1c7a4c24 TE |
682 | rc = -EINVAL; |
683 | goto exit; | |
1c7a4c24 | 684 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: |
26042530 | 685 | pr_err("Received a SUPERVISOR PDU\n"); |
1c7a4c24 TE |
686 | rc = -EINVAL; |
687 | goto exit; | |
1c7a4c24 TE |
688 | } |
689 | ||
1c7a4c24 TE |
690 | rc = nfc_tm_data_received(ddev->nfc_dev, resp); |
691 | ||
692 | exit: | |
693 | if (rc) | |
694 | kfree_skb(resp); | |
695 | } | |
696 | ||
697 | int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb) | |
698 | { | |
699 | struct digital_dep_req_res *dep_res; | |
700 | ||
701 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
b08147cb MG |
702 | |
703 | if (skb->len > ddev->remote_payload_max) | |
704 | return -EMSGSIZE; | |
705 | ||
1c7a4c24 TE |
706 | dep_res = (struct digital_dep_req_res *)skb->data; |
707 | ||
708 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
709 | dep_res->cmd = DIGITAL_CMD_DEP_RES; | |
710 | dep_res->pfb = ddev->curr_nfc_dep_pni; | |
711 | ||
05afedcb MG |
712 | if (ddev->did) { |
713 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; | |
714 | ||
715 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, | |
716 | sizeof(ddev->did)); | |
717 | } | |
718 | ||
485fdc9b MG |
719 | ddev->curr_nfc_dep_pni = |
720 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
721 | ||
1c7a4c24 TE |
722 | digital_skb_push_dep_sod(ddev, skb); |
723 | ||
724 | ddev->skb_add_crc(skb); | |
725 | ||
726 | return digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, | |
727 | NULL); | |
728 | } | |
729 | ||
730 | static void digital_tg_send_psl_res_complete(struct nfc_digital_dev *ddev, | |
731 | void *arg, struct sk_buff *resp) | |
732 | { | |
67af1d7a | 733 | u8 rf_tech = (unsigned long)arg; |
1c7a4c24 TE |
734 | |
735 | if (IS_ERR(resp)) | |
736 | return; | |
737 | ||
b711ad52 TE |
738 | digital_tg_set_rf_tech(ddev, rf_tech); |
739 | ||
1c7a4c24 TE |
740 | digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); |
741 | ||
742 | digital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL); | |
743 | ||
744 | dev_kfree_skb(resp); | |
745 | } | |
746 | ||
747 | static int digital_tg_send_psl_res(struct nfc_digital_dev *ddev, u8 did, | |
748 | u8 rf_tech) | |
749 | { | |
750 | struct digital_psl_res *psl_res; | |
751 | struct sk_buff *skb; | |
752 | int rc; | |
753 | ||
754 | skb = digital_skb_alloc(ddev, sizeof(struct digital_psl_res)); | |
755 | if (!skb) | |
756 | return -ENOMEM; | |
757 | ||
758 | skb_put(skb, sizeof(struct digital_psl_res)); | |
759 | ||
760 | psl_res = (struct digital_psl_res *)skb->data; | |
761 | ||
762 | psl_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
763 | psl_res->cmd = DIGITAL_CMD_PSL_RES; | |
764 | psl_res->did = did; | |
765 | ||
766 | digital_skb_push_dep_sod(ddev, skb); | |
767 | ||
768 | ddev->skb_add_crc(skb); | |
769 | ||
485fdc9b MG |
770 | ddev->curr_nfc_dep_pni = 0; |
771 | ||
1c7a4c24 | 772 | rc = digital_tg_send_cmd(ddev, skb, 0, digital_tg_send_psl_res_complete, |
67af1d7a | 773 | (void *)(unsigned long)rf_tech); |
1c7a4c24 TE |
774 | if (rc) |
775 | kfree_skb(skb); | |
776 | ||
777 | return rc; | |
778 | } | |
779 | ||
780 | static void digital_tg_recv_psl_req(struct nfc_digital_dev *ddev, void *arg, | |
781 | struct sk_buff *resp) | |
782 | { | |
783 | int rc; | |
784 | struct digital_psl_req *psl_req; | |
785 | u8 rf_tech; | |
b08147cb | 786 | u8 dsi, payload_size, payload_bits; |
1c7a4c24 TE |
787 | |
788 | if (IS_ERR(resp)) { | |
789 | rc = PTR_ERR(resp); | |
790 | resp = NULL; | |
791 | goto exit; | |
792 | } | |
793 | ||
794 | rc = ddev->skb_check_crc(resp); | |
795 | if (rc) { | |
796 | PROTOCOL_ERR("14.4.1.6"); | |
797 | goto exit; | |
798 | } | |
799 | ||
800 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
801 | if (rc) { | |
802 | PROTOCOL_ERR("14.4.1.2"); | |
803 | goto exit; | |
804 | } | |
805 | ||
806 | psl_req = (struct digital_psl_req *)resp->data; | |
807 | ||
808 | if (resp->len != sizeof(struct digital_psl_req) || | |
809 | psl_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
810 | psl_req->cmd != DIGITAL_CMD_PSL_REQ) { | |
811 | rc = -EIO; | |
812 | goto exit; | |
813 | } | |
814 | ||
815 | dsi = (psl_req->brs >> 3) & 0x07; | |
816 | switch (dsi) { | |
817 | case 0: | |
818 | rf_tech = NFC_DIGITAL_RF_TECH_106A; | |
819 | break; | |
820 | case 1: | |
821 | rf_tech = NFC_DIGITAL_RF_TECH_212F; | |
822 | break; | |
823 | case 2: | |
824 | rf_tech = NFC_DIGITAL_RF_TECH_424F; | |
825 | break; | |
826 | default: | |
77d84ff8 | 827 | pr_err("Unsupported dsi value %d\n", dsi); |
1c7a4c24 TE |
828 | goto exit; |
829 | } | |
830 | ||
b08147cb MG |
831 | payload_bits = DIGITAL_PAYLOAD_FSL_TO_BITS(psl_req->fsl); |
832 | payload_size = digital_payload_bits_to_size(payload_bits); | |
833 | ||
834 | if (!payload_size || (payload_size > min(ddev->local_payload_max, | |
835 | ddev->remote_payload_max))) { | |
836 | rc = -EINVAL; | |
837 | goto exit; | |
838 | } | |
839 | ||
840 | ddev->local_payload_max = payload_size; | |
841 | ddev->remote_payload_max = payload_size; | |
842 | ||
1c7a4c24 TE |
843 | rc = digital_tg_send_psl_res(ddev, psl_req->did, rf_tech); |
844 | ||
845 | exit: | |
846 | kfree_skb(resp); | |
847 | } | |
848 | ||
849 | static void digital_tg_send_atr_res_complete(struct nfc_digital_dev *ddev, | |
850 | void *arg, struct sk_buff *resp) | |
851 | { | |
852 | int offset; | |
853 | ||
854 | if (IS_ERR(resp)) { | |
855 | digital_poll_next_tech(ddev); | |
856 | return; | |
857 | } | |
858 | ||
859 | offset = 2; | |
860 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) | |
861 | offset++; | |
862 | ||
863 | if (resp->data[offset] == DIGITAL_CMD_PSL_REQ) | |
864 | digital_tg_recv_psl_req(ddev, arg, resp); | |
865 | else | |
866 | digital_tg_recv_dep_req(ddev, arg, resp); | |
867 | } | |
868 | ||
869 | static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev, | |
870 | struct digital_atr_req *atr_req) | |
871 | { | |
872 | struct digital_atr_res *atr_res; | |
873 | struct sk_buff *skb; | |
b08147cb | 874 | u8 *gb, payload_bits; |
1c7a4c24 TE |
875 | size_t gb_len; |
876 | int rc; | |
877 | ||
878 | gb = nfc_get_local_general_bytes(ddev->nfc_dev, &gb_len); | |
879 | if (!gb) | |
880 | gb_len = 0; | |
881 | ||
882 | skb = digital_skb_alloc(ddev, sizeof(struct digital_atr_res) + gb_len); | |
883 | if (!skb) | |
884 | return -ENOMEM; | |
885 | ||
886 | skb_put(skb, sizeof(struct digital_atr_res)); | |
887 | atr_res = (struct digital_atr_res *)skb->data; | |
888 | ||
889 | memset(atr_res, 0, sizeof(struct digital_atr_res)); | |
890 | ||
891 | atr_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
892 | atr_res->cmd = DIGITAL_CMD_ATR_RES; | |
893 | memcpy(atr_res->nfcid3, atr_req->nfcid3, sizeof(atr_req->nfcid3)); | |
894 | atr_res->to = 8; | |
b08147cb MG |
895 | |
896 | ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; | |
897 | payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); | |
898 | atr_res->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); | |
899 | ||
1c7a4c24 TE |
900 | if (gb_len) { |
901 | skb_put(skb, gb_len); | |
902 | ||
903 | atr_res->pp |= DIGITAL_GB_BIT; | |
904 | memcpy(atr_res->gb, gb, gb_len); | |
905 | } | |
906 | ||
907 | digital_skb_push_dep_sod(ddev, skb); | |
908 | ||
909 | ddev->skb_add_crc(skb); | |
910 | ||
485fdc9b MG |
911 | ddev->curr_nfc_dep_pni = 0; |
912 | ||
1c7a4c24 TE |
913 | rc = digital_tg_send_cmd(ddev, skb, 999, |
914 | digital_tg_send_atr_res_complete, NULL); | |
b15829ba | 915 | if (rc) |
1c7a4c24 | 916 | kfree_skb(skb); |
1c7a4c24 TE |
917 | |
918 | return rc; | |
919 | } | |
920 | ||
921 | void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg, | |
922 | struct sk_buff *resp) | |
923 | { | |
924 | int rc; | |
925 | struct digital_atr_req *atr_req; | |
926 | size_t gb_len, min_size; | |
b08147cb | 927 | u8 poll_tech_count, payload_bits; |
1c7a4c24 TE |
928 | |
929 | if (IS_ERR(resp)) { | |
930 | rc = PTR_ERR(resp); | |
931 | resp = NULL; | |
932 | goto exit; | |
933 | } | |
934 | ||
935 | if (!resp->len) { | |
936 | rc = -EIO; | |
937 | goto exit; | |
938 | } | |
939 | ||
940 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) { | |
941 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 2; | |
b711ad52 | 942 | digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_106A); |
1c7a4c24 TE |
943 | } else { |
944 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 1; | |
b711ad52 | 945 | digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_212F); |
1c7a4c24 TE |
946 | } |
947 | ||
948 | if (resp->len < min_size) { | |
949 | rc = -EIO; | |
950 | goto exit; | |
951 | } | |
952 | ||
48e10445 | 953 | ddev->curr_protocol = NFC_PROTO_NFC_DEP_MASK; |
1c7a4c24 TE |
954 | |
955 | rc = ddev->skb_check_crc(resp); | |
956 | if (rc) { | |
957 | PROTOCOL_ERR("14.4.1.6"); | |
958 | goto exit; | |
959 | } | |
960 | ||
961 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
962 | if (rc) { | |
963 | PROTOCOL_ERR("14.4.1.2"); | |
964 | goto exit; | |
965 | } | |
966 | ||
967 | atr_req = (struct digital_atr_req *)resp->data; | |
968 | ||
969 | if (atr_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
05afedcb MG |
970 | atr_req->cmd != DIGITAL_CMD_ATR_REQ || |
971 | atr_req->did > DIGITAL_DID_MAX) { | |
1c7a4c24 TE |
972 | rc = -EINVAL; |
973 | goto exit; | |
974 | } | |
975 | ||
b08147cb MG |
976 | payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_req->pp); |
977 | ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); | |
978 | ||
979 | if (!ddev->remote_payload_max) { | |
980 | rc = -EINVAL; | |
981 | goto exit; | |
982 | } | |
983 | ||
05afedcb MG |
984 | ddev->did = atr_req->did; |
985 | ||
1c7a4c24 TE |
986 | rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, |
987 | NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED); | |
988 | if (rc) | |
989 | goto exit; | |
990 | ||
991 | rc = digital_tg_send_atr_res(ddev, atr_req); | |
992 | if (rc) | |
993 | goto exit; | |
994 | ||
995 | gb_len = resp->len - sizeof(struct digital_atr_req); | |
0529a7ad MG |
996 | |
997 | poll_tech_count = ddev->poll_tech_count; | |
998 | ddev->poll_tech_count = 0; | |
999 | ||
1c7a4c24 TE |
1000 | rc = nfc_tm_activated(ddev->nfc_dev, NFC_PROTO_NFC_DEP_MASK, |
1001 | NFC_COMM_PASSIVE, atr_req->gb, gb_len); | |
0529a7ad MG |
1002 | if (rc) { |
1003 | ddev->poll_tech_count = poll_tech_count; | |
1c7a4c24 | 1004 | goto exit; |
0529a7ad | 1005 | } |
1c7a4c24 TE |
1006 | |
1007 | rc = 0; | |
1008 | exit: | |
1009 | if (rc) | |
1010 | digital_poll_next_tech(ddev); | |
1011 | ||
1012 | dev_kfree_skb(resp); | |
1013 | } |