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 | ||
a80509c7 | 20 | #define DIGITAL_NFC_DEP_N_RETRY_NACK 2 |
384ab1d1 | 21 | #define DIGITAL_NFC_DEP_N_RETRY_ATN 2 |
a80509c7 | 22 | |
7d0911c0 TE |
23 | #define DIGITAL_NFC_DEP_FRAME_DIR_OUT 0xD4 |
24 | #define DIGITAL_NFC_DEP_FRAME_DIR_IN 0xD5 | |
25 | ||
26 | #define DIGITAL_NFC_DEP_NFCA_SOD_SB 0xF0 | |
27 | ||
28 | #define DIGITAL_CMD_ATR_REQ 0x00 | |
29 | #define DIGITAL_CMD_ATR_RES 0x01 | |
30 | #define DIGITAL_CMD_PSL_REQ 0x04 | |
31 | #define DIGITAL_CMD_PSL_RES 0x05 | |
32 | #define DIGITAL_CMD_DEP_REQ 0x06 | |
33 | #define DIGITAL_CMD_DEP_RES 0x07 | |
34 | ||
35 | #define DIGITAL_ATR_REQ_MIN_SIZE 16 | |
36 | #define DIGITAL_ATR_REQ_MAX_SIZE 64 | |
37 | ||
05afedcb MG |
38 | #define DIGITAL_DID_MAX 14 |
39 | ||
b08147cb MG |
40 | #define DIGITAL_PAYLOAD_SIZE_MAX 254 |
41 | #define DIGITAL_PAYLOAD_BITS_TO_PP(s) (((s) & 0x3) << 4) | |
42 | #define DIGITAL_PAYLOAD_PP_TO_BITS(s) (((s) >> 4) & 0x3) | |
43 | #define DIGITAL_PAYLOAD_BITS_TO_FSL(s) ((s) & 0x3) | |
44 | #define DIGITAL_PAYLOAD_FSL_TO_BITS(s) ((s) & 0x3) | |
45 | ||
7d0911c0 TE |
46 | #define DIGITAL_GB_BIT 0x02 |
47 | ||
3bd2a5bc MG |
48 | #define DIGITAL_NFC_DEP_REQ_RES_HEADROOM 2 /* SoD: [SB (NFC-A)] + LEN */ |
49 | #define DIGITAL_NFC_DEP_REQ_RES_TAILROOM 2 /* EoD: 2-byte CRC */ | |
50 | ||
7d0911c0 TE |
51 | #define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0) |
52 | ||
53 | #define DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT 0x10 | |
3bd2a5bc MG |
54 | #define DIGITAL_NFC_DEP_PFB_MI_BIT 0x10 |
55 | #define DIGITAL_NFC_DEP_PFB_NACK_BIT 0x10 | |
05afedcb | 56 | #define DIGITAL_NFC_DEP_PFB_DID_BIT 0x04 |
7d0911c0 TE |
57 | |
58 | #define DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb) \ | |
59 | ((pfb) & DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT) | |
3bd2a5bc MG |
60 | #define DIGITAL_NFC_DEP_MI_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_MI_BIT) |
61 | #define DIGITAL_NFC_DEP_NACK_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_NACK_BIT) | |
7d0911c0 | 62 | #define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08) |
05afedcb | 63 | #define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_DID_BIT) |
7d0911c0 TE |
64 | #define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03) |
65 | ||
66 | #define DIGITAL_NFC_DEP_PFB_I_PDU 0x00 | |
67 | #define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40 | |
68 | #define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80 | |
69 | ||
70 | struct digital_atr_req { | |
71 | u8 dir; | |
72 | u8 cmd; | |
73 | u8 nfcid3[10]; | |
74 | u8 did; | |
75 | u8 bs; | |
76 | u8 br; | |
77 | u8 pp; | |
78 | u8 gb[0]; | |
79 | } __packed; | |
80 | ||
81 | struct digital_atr_res { | |
82 | u8 dir; | |
83 | u8 cmd; | |
84 | u8 nfcid3[10]; | |
85 | u8 did; | |
86 | u8 bs; | |
87 | u8 br; | |
88 | u8 to; | |
89 | u8 pp; | |
90 | u8 gb[0]; | |
91 | } __packed; | |
92 | ||
93 | struct digital_psl_req { | |
94 | u8 dir; | |
95 | u8 cmd; | |
96 | u8 did; | |
97 | u8 brs; | |
98 | u8 fsl; | |
99 | } __packed; | |
100 | ||
101 | struct digital_psl_res { | |
102 | u8 dir; | |
103 | u8 cmd; | |
104 | u8 did; | |
105 | } __packed; | |
106 | ||
107 | struct digital_dep_req_res { | |
108 | u8 dir; | |
109 | u8 cmd; | |
110 | u8 pfb; | |
111 | } __packed; | |
112 | ||
113 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, | |
114 | struct sk_buff *resp); | |
c12715ab MG |
115 | static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, |
116 | struct sk_buff *resp); | |
7d0911c0 | 117 | |
b08147cb MG |
118 | static const u8 digital_payload_bits_map[4] = { |
119 | [0] = 64, | |
120 | [1] = 128, | |
121 | [2] = 192, | |
122 | [3] = 254 | |
123 | }; | |
124 | ||
125 | static u8 digital_payload_bits_to_size(u8 payload_bits) | |
126 | { | |
127 | if (payload_bits >= ARRAY_SIZE(digital_payload_bits_map)) | |
128 | return 0; | |
129 | ||
130 | return digital_payload_bits_map[payload_bits]; | |
131 | } | |
132 | ||
133 | static u8 digital_payload_size_to_bits(u8 payload_size) | |
134 | { | |
135 | int i; | |
136 | ||
137 | for (i = 0; i < ARRAY_SIZE(digital_payload_bits_map); i++) | |
138 | if (digital_payload_bits_map[i] == payload_size) | |
139 | return i; | |
140 | ||
141 | return 0xff; | |
142 | } | |
143 | ||
7d0911c0 TE |
144 | static void digital_skb_push_dep_sod(struct nfc_digital_dev *ddev, |
145 | struct sk_buff *skb) | |
146 | { | |
147 | skb_push(skb, sizeof(u8)); | |
148 | ||
149 | skb->data[0] = skb->len; | |
150 | ||
151 | if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) | |
152 | *skb_push(skb, sizeof(u8)) = DIGITAL_NFC_DEP_NFCA_SOD_SB; | |
153 | } | |
154 | ||
155 | static int digital_skb_pull_dep_sod(struct nfc_digital_dev *ddev, | |
156 | struct sk_buff *skb) | |
157 | { | |
158 | u8 size; | |
159 | ||
160 | if (skb->len < 2) | |
161 | return -EIO; | |
162 | ||
163 | if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) | |
164 | skb_pull(skb, sizeof(u8)); | |
165 | ||
166 | size = skb->data[0]; | |
167 | if (size != skb->len) | |
168 | return -EIO; | |
169 | ||
170 | skb_pull(skb, sizeof(u8)); | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
3bd2a5bc MG |
175 | static struct sk_buff * |
176 | digital_send_dep_data_prep(struct nfc_digital_dev *ddev, struct sk_buff *skb, | |
177 | struct digital_dep_req_res *dep_req_res, | |
178 | struct digital_data_exch *data_exch) | |
179 | { | |
180 | struct sk_buff *new_skb; | |
181 | ||
182 | if (skb->len > ddev->remote_payload_max) { | |
183 | dep_req_res->pfb |= DIGITAL_NFC_DEP_PFB_MI_BIT; | |
184 | ||
185 | new_skb = digital_skb_alloc(ddev, ddev->remote_payload_max); | |
186 | if (!new_skb) { | |
187 | kfree_skb(ddev->chaining_skb); | |
188 | ddev->chaining_skb = NULL; | |
189 | ||
190 | return ERR_PTR(-ENOMEM); | |
191 | } | |
192 | ||
193 | skb_reserve(new_skb, ddev->tx_headroom + NFC_HEADER_SIZE + | |
194 | DIGITAL_NFC_DEP_REQ_RES_HEADROOM); | |
195 | memcpy(skb_put(new_skb, ddev->remote_payload_max), skb->data, | |
196 | ddev->remote_payload_max); | |
197 | skb_pull(skb, ddev->remote_payload_max); | |
198 | ||
199 | ddev->chaining_skb = skb; | |
200 | ddev->data_exch = data_exch; | |
201 | } else { | |
202 | ddev->chaining_skb = NULL; | |
203 | new_skb = skb; | |
204 | } | |
205 | ||
206 | return new_skb; | |
207 | } | |
208 | ||
c12715ab MG |
209 | static struct sk_buff * |
210 | digital_recv_dep_data_gather(struct nfc_digital_dev *ddev, u8 pfb, | |
211 | struct sk_buff *resp, | |
212 | int (*send_ack)(struct nfc_digital_dev *ddev, | |
213 | struct digital_data_exch | |
214 | *data_exch), | |
215 | struct digital_data_exch *data_exch) | |
216 | { | |
217 | struct sk_buff *new_skb; | |
218 | int rc; | |
219 | ||
220 | if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb) && (!ddev->chaining_skb)) { | |
221 | ddev->chaining_skb = | |
222 | nfc_alloc_recv_skb(8 * ddev->local_payload_max, | |
223 | GFP_KERNEL); | |
224 | if (!ddev->chaining_skb) { | |
225 | rc = -ENOMEM; | |
226 | goto error; | |
227 | } | |
228 | } | |
229 | ||
230 | if (ddev->chaining_skb) { | |
231 | if (resp->len > skb_tailroom(ddev->chaining_skb)) { | |
232 | new_skb = skb_copy_expand(ddev->chaining_skb, | |
233 | skb_headroom( | |
234 | ddev->chaining_skb), | |
235 | 8 * ddev->local_payload_max, | |
236 | GFP_KERNEL); | |
237 | if (!new_skb) { | |
238 | rc = -ENOMEM; | |
239 | goto error; | |
240 | } | |
241 | ||
242 | kfree_skb(ddev->chaining_skb); | |
243 | ddev->chaining_skb = new_skb; | |
244 | } | |
245 | ||
246 | memcpy(skb_put(ddev->chaining_skb, resp->len), resp->data, | |
247 | resp->len); | |
248 | ||
249 | kfree_skb(resp); | |
250 | resp = NULL; | |
251 | ||
252 | if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb)) { | |
253 | rc = send_ack(ddev, data_exch); | |
254 | if (rc) | |
255 | goto error; | |
256 | ||
257 | return NULL; | |
258 | } | |
259 | ||
260 | resp = ddev->chaining_skb; | |
261 | ddev->chaining_skb = NULL; | |
262 | } | |
263 | ||
264 | return resp; | |
265 | ||
266 | error: | |
267 | kfree_skb(resp); | |
268 | ||
269 | kfree_skb(ddev->chaining_skb); | |
270 | ddev->chaining_skb = NULL; | |
271 | ||
272 | return ERR_PTR(rc); | |
273 | } | |
274 | ||
dddb3da0 MG |
275 | static void digital_in_recv_psl_res(struct nfc_digital_dev *ddev, void *arg, |
276 | struct sk_buff *resp) | |
277 | { | |
278 | struct nfc_target *target = arg; | |
279 | struct digital_psl_res *psl_res; | |
280 | int rc; | |
281 | ||
282 | if (IS_ERR(resp)) { | |
283 | rc = PTR_ERR(resp); | |
284 | resp = NULL; | |
285 | goto exit; | |
286 | } | |
287 | ||
288 | rc = ddev->skb_check_crc(resp); | |
289 | if (rc) { | |
290 | PROTOCOL_ERR("14.4.1.6"); | |
291 | goto exit; | |
292 | } | |
293 | ||
294 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
295 | if (rc) { | |
296 | PROTOCOL_ERR("14.4.1.2"); | |
297 | goto exit; | |
298 | } | |
299 | ||
300 | psl_res = (struct digital_psl_res *)resp->data; | |
301 | ||
302 | if ((resp->len != sizeof(*psl_res)) || | |
303 | (psl_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN) || | |
304 | (psl_res->cmd != DIGITAL_CMD_PSL_RES)) { | |
305 | rc = -EIO; | |
306 | goto exit; | |
307 | } | |
308 | ||
309 | rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, | |
310 | NFC_DIGITAL_RF_TECH_424F); | |
311 | if (rc) | |
312 | goto exit; | |
313 | ||
314 | rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, | |
315 | NFC_DIGITAL_FRAMING_NFCF_NFC_DEP); | |
316 | if (rc) | |
317 | goto exit; | |
318 | ||
319 | if (!DIGITAL_DRV_CAPS_IN_CRC(ddev) && | |
320 | (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)) { | |
321 | ddev->skb_add_crc = digital_skb_add_crc_f; | |
322 | ddev->skb_check_crc = digital_skb_check_crc_f; | |
323 | } | |
324 | ||
325 | ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_424F; | |
326 | ||
327 | nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, | |
328 | NFC_RF_INITIATOR); | |
329 | ||
330 | ddev->curr_nfc_dep_pni = 0; | |
331 | ||
332 | exit: | |
333 | dev_kfree_skb(resp); | |
334 | ||
335 | if (rc) | |
336 | ddev->curr_protocol = 0; | |
337 | } | |
338 | ||
339 | static int digital_in_send_psl_req(struct nfc_digital_dev *ddev, | |
340 | struct nfc_target *target) | |
341 | { | |
342 | struct sk_buff *skb; | |
343 | struct digital_psl_req *psl_req; | |
b15829ba | 344 | int rc; |
b08147cb | 345 | u8 payload_size, payload_bits; |
dddb3da0 MG |
346 | |
347 | skb = digital_skb_alloc(ddev, sizeof(*psl_req)); | |
348 | if (!skb) | |
349 | return -ENOMEM; | |
350 | ||
351 | skb_put(skb, sizeof(*psl_req)); | |
352 | ||
353 | psl_req = (struct digital_psl_req *)skb->data; | |
354 | ||
355 | psl_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
356 | psl_req->cmd = DIGITAL_CMD_PSL_REQ; | |
357 | psl_req->did = 0; | |
358 | psl_req->brs = (0x2 << 3) | 0x2; /* 424F both directions */ | |
b08147cb MG |
359 | |
360 | payload_size = min(ddev->local_payload_max, ddev->remote_payload_max); | |
361 | payload_bits = digital_payload_size_to_bits(payload_size); | |
362 | psl_req->fsl = DIGITAL_PAYLOAD_BITS_TO_FSL(payload_bits); | |
363 | ||
364 | ddev->local_payload_max = payload_size; | |
365 | ddev->remote_payload_max = payload_size; | |
dddb3da0 MG |
366 | |
367 | digital_skb_push_dep_sod(ddev, skb); | |
368 | ||
369 | ddev->skb_add_crc(skb); | |
370 | ||
b15829ba MG |
371 | rc = digital_in_send_cmd(ddev, skb, 500, digital_in_recv_psl_res, |
372 | target); | |
373 | if (rc) | |
374 | kfree_skb(skb); | |
375 | ||
376 | return rc; | |
dddb3da0 MG |
377 | } |
378 | ||
7d0911c0 TE |
379 | static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg, |
380 | struct sk_buff *resp) | |
381 | { | |
382 | struct nfc_target *target = arg; | |
383 | struct digital_atr_res *atr_res; | |
b08147cb | 384 | u8 gb_len, payload_bits; |
7d0911c0 TE |
385 | int rc; |
386 | ||
387 | if (IS_ERR(resp)) { | |
388 | rc = PTR_ERR(resp); | |
389 | resp = NULL; | |
390 | goto exit; | |
391 | } | |
392 | ||
393 | rc = ddev->skb_check_crc(resp); | |
394 | if (rc) { | |
395 | PROTOCOL_ERR("14.4.1.6"); | |
396 | goto exit; | |
397 | } | |
398 | ||
399 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
400 | if (rc) { | |
401 | PROTOCOL_ERR("14.4.1.2"); | |
402 | goto exit; | |
403 | } | |
404 | ||
405 | if (resp->len < sizeof(struct digital_atr_res)) { | |
406 | rc = -EIO; | |
407 | goto exit; | |
408 | } | |
409 | ||
410 | gb_len = resp->len - sizeof(struct digital_atr_res); | |
411 | ||
412 | atr_res = (struct digital_atr_res *)resp->data; | |
413 | ||
b08147cb MG |
414 | payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_res->pp); |
415 | ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); | |
416 | ||
417 | if (!ddev->remote_payload_max) { | |
418 | rc = -EINVAL; | |
419 | goto exit; | |
420 | } | |
421 | ||
7d0911c0 TE |
422 | rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len); |
423 | if (rc) | |
424 | goto exit; | |
425 | ||
dddb3da0 MG |
426 | if ((ddev->protocols & NFC_PROTO_FELICA_MASK) && |
427 | (ddev->curr_rf_tech != NFC_DIGITAL_RF_TECH_424F)) { | |
428 | rc = digital_in_send_psl_req(ddev, target); | |
429 | if (!rc) | |
430 | goto exit; | |
431 | } | |
432 | ||
7d0911c0 TE |
433 | rc = nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, |
434 | NFC_RF_INITIATOR); | |
435 | ||
436 | ddev->curr_nfc_dep_pni = 0; | |
437 | ||
438 | exit: | |
439 | dev_kfree_skb(resp); | |
440 | ||
441 | if (rc) | |
442 | ddev->curr_protocol = 0; | |
443 | } | |
444 | ||
445 | int digital_in_send_atr_req(struct nfc_digital_dev *ddev, | |
446 | struct nfc_target *target, __u8 comm_mode, __u8 *gb, | |
447 | size_t gb_len) | |
448 | { | |
449 | struct sk_buff *skb; | |
450 | struct digital_atr_req *atr_req; | |
451 | uint size; | |
b15829ba | 452 | int rc; |
b08147cb | 453 | u8 payload_bits; |
7d0911c0 TE |
454 | |
455 | size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len; | |
456 | ||
457 | if (size > DIGITAL_ATR_REQ_MAX_SIZE) { | |
458 | PROTOCOL_ERR("14.6.1.1"); | |
459 | return -EINVAL; | |
460 | } | |
461 | ||
462 | skb = digital_skb_alloc(ddev, size); | |
463 | if (!skb) | |
464 | return -ENOMEM; | |
465 | ||
466 | skb_put(skb, sizeof(struct digital_atr_req)); | |
467 | ||
468 | atr_req = (struct digital_atr_req *)skb->data; | |
469 | memset(atr_req, 0, sizeof(struct digital_atr_req)); | |
470 | ||
471 | atr_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
472 | atr_req->cmd = DIGITAL_CMD_ATR_REQ; | |
473 | if (target->nfcid2_len) | |
4f319e32 | 474 | memcpy(atr_req->nfcid3, target->nfcid2, NFC_NFCID2_MAXSIZE); |
7d0911c0 | 475 | else |
4f319e32 | 476 | get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE); |
7d0911c0 TE |
477 | |
478 | atr_req->did = 0; | |
479 | atr_req->bs = 0; | |
480 | atr_req->br = 0; | |
481 | ||
b08147cb MG |
482 | ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; |
483 | payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); | |
484 | atr_req->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); | |
7d0911c0 TE |
485 | |
486 | if (gb_len) { | |
487 | atr_req->pp |= DIGITAL_GB_BIT; | |
488 | memcpy(skb_put(skb, gb_len), gb, gb_len); | |
489 | } | |
490 | ||
491 | digital_skb_push_dep_sod(ddev, skb); | |
492 | ||
493 | ddev->skb_add_crc(skb); | |
494 | ||
b15829ba MG |
495 | rc = digital_in_send_cmd(ddev, skb, 500, digital_in_recv_atr_res, |
496 | target); | |
497 | if (rc) | |
498 | kfree_skb(skb); | |
499 | ||
500 | return rc; | |
7d0911c0 TE |
501 | } |
502 | ||
c12715ab MG |
503 | static int digital_in_send_ack(struct nfc_digital_dev *ddev, |
504 | struct digital_data_exch *data_exch) | |
505 | { | |
506 | struct digital_dep_req_res *dep_req; | |
507 | struct sk_buff *skb; | |
508 | int rc; | |
509 | ||
510 | skb = digital_skb_alloc(ddev, 1); | |
511 | if (!skb) | |
512 | return -ENOMEM; | |
513 | ||
514 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
515 | ||
516 | dep_req = (struct digital_dep_req_res *)skb->data; | |
517 | ||
518 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
519 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
520 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | | |
521 | ddev->curr_nfc_dep_pni; | |
522 | ||
523 | digital_skb_push_dep_sod(ddev, skb); | |
524 | ||
525 | ddev->skb_add_crc(skb); | |
526 | ||
384ab1d1 MG |
527 | ddev->saved_skb = skb_get(skb); |
528 | ddev->saved_skb_len = skb->len; | |
529 | ||
c12715ab MG |
530 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, |
531 | data_exch); | |
384ab1d1 | 532 | if (rc) { |
c12715ab | 533 | kfree_skb(skb); |
384ab1d1 MG |
534 | kfree_skb(ddev->saved_skb); |
535 | ddev->saved_skb = NULL; | |
536 | } | |
c12715ab MG |
537 | |
538 | return rc; | |
539 | } | |
540 | ||
a80509c7 MG |
541 | static int digital_in_send_nack(struct nfc_digital_dev *ddev, |
542 | struct digital_data_exch *data_exch) | |
543 | { | |
544 | struct digital_dep_req_res *dep_req; | |
545 | struct sk_buff *skb; | |
546 | int rc; | |
547 | ||
548 | skb = digital_skb_alloc(ddev, 1); | |
549 | if (!skb) | |
550 | return -ENOMEM; | |
551 | ||
552 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
553 | ||
554 | dep_req = (struct digital_dep_req_res *)skb->data; | |
555 | ||
556 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
557 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
558 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | | |
559 | DIGITAL_NFC_DEP_PFB_NACK_BIT | ddev->curr_nfc_dep_pni; | |
560 | ||
561 | digital_skb_push_dep_sod(ddev, skb); | |
562 | ||
563 | ddev->skb_add_crc(skb); | |
564 | ||
565 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, | |
566 | data_exch); | |
567 | if (rc) | |
568 | kfree_skb(skb); | |
569 | ||
570 | return rc; | |
571 | } | |
572 | ||
384ab1d1 MG |
573 | static int digital_in_send_atn(struct nfc_digital_dev *ddev, |
574 | struct digital_data_exch *data_exch) | |
575 | { | |
576 | struct digital_dep_req_res *dep_req; | |
577 | struct sk_buff *skb; | |
578 | int rc; | |
579 | ||
580 | skb = digital_skb_alloc(ddev, 1); | |
581 | if (!skb) | |
582 | return -ENOMEM; | |
583 | ||
584 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
585 | ||
586 | dep_req = (struct digital_dep_req_res *)skb->data; | |
587 | ||
588 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
589 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
590 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU; | |
591 | ||
592 | digital_skb_push_dep_sod(ddev, skb); | |
593 | ||
594 | ddev->skb_add_crc(skb); | |
595 | ||
596 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, | |
597 | data_exch); | |
598 | if (rc) | |
599 | kfree_skb(skb); | |
600 | ||
601 | return rc; | |
602 | } | |
603 | ||
7d0911c0 TE |
604 | static int digital_in_send_rtox(struct nfc_digital_dev *ddev, |
605 | struct digital_data_exch *data_exch, u8 rtox) | |
606 | { | |
607 | struct digital_dep_req_res *dep_req; | |
608 | struct sk_buff *skb; | |
609 | int rc; | |
610 | ||
611 | skb = digital_skb_alloc(ddev, 1); | |
612 | if (!skb) | |
613 | return -ENOMEM; | |
614 | ||
615 | *skb_put(skb, 1) = rtox; | |
616 | ||
617 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
618 | ||
619 | dep_req = (struct digital_dep_req_res *)skb->data; | |
620 | ||
621 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
622 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
623 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU | | |
624 | DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT; | |
625 | ||
626 | digital_skb_push_dep_sod(ddev, skb); | |
627 | ||
628 | ddev->skb_add_crc(skb); | |
629 | ||
384ab1d1 MG |
630 | ddev->saved_skb = skb_get(skb); |
631 | ddev->saved_skb_len = skb->len; | |
632 | ||
7d0911c0 TE |
633 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, |
634 | data_exch); | |
384ab1d1 | 635 | if (rc) { |
b15829ba | 636 | kfree_skb(skb); |
384ab1d1 MG |
637 | kfree_skb(ddev->saved_skb); |
638 | ddev->saved_skb = NULL; | |
639 | } | |
7d0911c0 TE |
640 | |
641 | return rc; | |
642 | } | |
643 | ||
384ab1d1 MG |
644 | static int digital_in_send_saved_skb(struct nfc_digital_dev *ddev, |
645 | struct digital_data_exch *data_exch) | |
646 | { | |
647 | skb_get(ddev->saved_skb); | |
648 | skb_push(ddev->saved_skb, ddev->saved_skb_len); | |
649 | ||
650 | return digital_in_send_cmd(ddev, ddev->saved_skb, 1500, | |
651 | digital_in_recv_dep_res, data_exch); | |
652 | } | |
653 | ||
7d0911c0 TE |
654 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, |
655 | struct sk_buff *resp) | |
656 | { | |
657 | struct digital_data_exch *data_exch = arg; | |
658 | struct digital_dep_req_res *dep_res; | |
659 | u8 pfb; | |
660 | uint size; | |
661 | int rc; | |
662 | ||
663 | if (IS_ERR(resp)) { | |
664 | rc = PTR_ERR(resp); | |
665 | resp = NULL; | |
a80509c7 | 666 | |
384ab1d1 | 667 | if (((rc != -ETIMEDOUT) || ddev->nack_count) && |
a80509c7 | 668 | (ddev->nack_count++ < DIGITAL_NFC_DEP_N_RETRY_NACK)) { |
384ab1d1 MG |
669 | ddev->atn_count = 0; |
670 | ||
a80509c7 MG |
671 | rc = digital_in_send_nack(ddev, data_exch); |
672 | if (rc) | |
673 | goto error; | |
674 | ||
384ab1d1 MG |
675 | return; |
676 | } else if ((rc == -ETIMEDOUT) && | |
677 | (ddev->atn_count++ < DIGITAL_NFC_DEP_N_RETRY_ATN)) { | |
678 | ddev->nack_count = 0; | |
679 | ||
680 | rc = digital_in_send_atn(ddev, data_exch); | |
681 | if (rc) | |
682 | goto error; | |
683 | ||
a80509c7 MG |
684 | return; |
685 | } | |
686 | ||
687 | goto exit; | |
688 | } | |
689 | ||
690 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
691 | if (rc) { | |
692 | PROTOCOL_ERR("14.4.1.2"); | |
7d0911c0 TE |
693 | goto exit; |
694 | } | |
695 | ||
696 | rc = ddev->skb_check_crc(resp); | |
697 | if (rc) { | |
a80509c7 MG |
698 | if ((resp->len >= 4) && |
699 | (ddev->nack_count++ < DIGITAL_NFC_DEP_N_RETRY_NACK)) { | |
384ab1d1 MG |
700 | ddev->atn_count = 0; |
701 | ||
a80509c7 MG |
702 | rc = digital_in_send_nack(ddev, data_exch); |
703 | if (rc) | |
704 | goto error; | |
705 | ||
706 | kfree_skb(resp); | |
707 | ||
708 | return; | |
709 | } | |
710 | ||
7d0911c0 TE |
711 | PROTOCOL_ERR("14.4.1.6"); |
712 | goto error; | |
713 | } | |
714 | ||
384ab1d1 | 715 | ddev->atn_count = 0; |
a80509c7 | 716 | ddev->nack_count = 0; |
7d0911c0 | 717 | |
b08147cb MG |
718 | if (resp->len > ddev->local_payload_max) { |
719 | rc = -EMSGSIZE; | |
720 | goto exit; | |
721 | } | |
722 | ||
6ce30668 | 723 | size = sizeof(struct digital_dep_req_res); |
7d0911c0 TE |
724 | dep_res = (struct digital_dep_req_res *)resp->data; |
725 | ||
6ce30668 | 726 | if (resp->len < size || dep_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN || |
7d0911c0 TE |
727 | dep_res->cmd != DIGITAL_CMD_DEP_RES) { |
728 | rc = -EIO; | |
729 | goto error; | |
730 | } | |
731 | ||
732 | pfb = dep_res->pfb; | |
733 | ||
3bc3f88a MG |
734 | if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { |
735 | PROTOCOL_ERR("14.8.2.1"); | |
736 | rc = -EIO; | |
737 | goto error; | |
738 | } | |
6ce30668 | 739 | |
3e6b0de8 MG |
740 | if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) { |
741 | rc = -EIO; | |
742 | goto exit; | |
743 | } | |
744 | ||
6ce30668 MG |
745 | if (size > resp->len) { |
746 | rc = -EIO; | |
747 | goto error; | |
748 | } | |
749 | ||
750 | skb_pull(resp, size); | |
751 | ||
7d0911c0 TE |
752 | switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { |
753 | case DIGITAL_NFC_DEP_PFB_I_PDU: | |
754 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { | |
755 | PROTOCOL_ERR("14.12.3.3"); | |
756 | rc = -EIO; | |
757 | goto error; | |
758 | } | |
759 | ||
760 | ddev->curr_nfc_dep_pni = | |
761 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
c12715ab | 762 | |
384ab1d1 MG |
763 | kfree_skb(ddev->saved_skb); |
764 | ddev->saved_skb = NULL; | |
765 | ||
c12715ab MG |
766 | resp = digital_recv_dep_data_gather(ddev, pfb, resp, |
767 | digital_in_send_ack, | |
768 | data_exch); | |
769 | if (IS_ERR(resp)) { | |
770 | rc = PTR_ERR(resp); | |
771 | resp = NULL; | |
772 | goto error; | |
773 | } | |
774 | ||
775 | /* If resp is NULL then we're still chaining so return and | |
776 | * wait for the next part of the PDU. Else, the PDU is | |
777 | * complete so pass it up. | |
778 | */ | |
779 | if (!resp) | |
780 | return; | |
781 | ||
7d0911c0 TE |
782 | rc = 0; |
783 | break; | |
784 | ||
785 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: | |
485fdc9b MG |
786 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { |
787 | PROTOCOL_ERR("14.12.3.3"); | |
788 | rc = -EIO; | |
789 | goto exit; | |
790 | } | |
791 | ||
792 | ddev->curr_nfc_dep_pni = | |
793 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
794 | ||
3bd2a5bc | 795 | if (ddev->chaining_skb && !DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { |
384ab1d1 MG |
796 | kfree_skb(ddev->saved_skb); |
797 | ddev->saved_skb = NULL; | |
798 | ||
3bd2a5bc MG |
799 | rc = digital_in_send_dep_req(ddev, NULL, |
800 | ddev->chaining_skb, | |
801 | ddev->data_exch); | |
802 | if (rc) | |
803 | goto error; | |
804 | ||
805 | return; | |
806 | } | |
807 | ||
808 | pr_err("Received a ACK/NACK PDU\n"); | |
485fdc9b MG |
809 | rc = -EINVAL; |
810 | goto exit; | |
7d0911c0 TE |
811 | |
812 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: | |
384ab1d1 MG |
813 | if (!DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { /* ATN */ |
814 | rc = digital_in_send_saved_skb(ddev, data_exch); | |
815 | if (rc) { | |
816 | kfree_skb(ddev->saved_skb); | |
817 | goto error; | |
818 | } | |
819 | ||
820 | return; | |
7d0911c0 TE |
821 | } |
822 | ||
384ab1d1 MG |
823 | kfree_skb(ddev->saved_skb); |
824 | ddev->saved_skb = NULL; | |
825 | ||
6ce30668 | 826 | rc = digital_in_send_rtox(ddev, data_exch, resp->data[0]); |
7d0911c0 TE |
827 | if (rc) |
828 | goto error; | |
829 | ||
830 | kfree_skb(resp); | |
831 | return; | |
832 | } | |
833 | ||
7d0911c0 TE |
834 | exit: |
835 | data_exch->cb(data_exch->cb_context, resp, rc); | |
836 | ||
837 | error: | |
838 | kfree(data_exch); | |
839 | ||
3bd2a5bc MG |
840 | kfree_skb(ddev->chaining_skb); |
841 | ddev->chaining_skb = NULL; | |
842 | ||
384ab1d1 MG |
843 | kfree_skb(ddev->saved_skb); |
844 | ddev->saved_skb = NULL; | |
845 | ||
7d0911c0 TE |
846 | if (rc) |
847 | kfree_skb(resp); | |
848 | } | |
849 | ||
850 | int digital_in_send_dep_req(struct nfc_digital_dev *ddev, | |
851 | struct nfc_target *target, struct sk_buff *skb, | |
852 | struct digital_data_exch *data_exch) | |
853 | { | |
854 | struct digital_dep_req_res *dep_req; | |
3bd2a5bc MG |
855 | struct sk_buff *chaining_skb, *tmp_skb; |
856 | int rc; | |
7d0911c0 TE |
857 | |
858 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
859 | ||
860 | dep_req = (struct digital_dep_req_res *)skb->data; | |
3bd2a5bc | 861 | |
7d0911c0 TE |
862 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
863 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
864 | dep_req->pfb = ddev->curr_nfc_dep_pni; | |
865 | ||
384ab1d1 | 866 | ddev->atn_count = 0; |
a80509c7 MG |
867 | ddev->nack_count = 0; |
868 | ||
3bd2a5bc | 869 | chaining_skb = ddev->chaining_skb; |
7d0911c0 | 870 | |
3bd2a5bc MG |
871 | tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_req, data_exch); |
872 | if (IS_ERR(tmp_skb)) | |
873 | return PTR_ERR(tmp_skb); | |
7d0911c0 | 874 | |
3bd2a5bc MG |
875 | digital_skb_push_dep_sod(ddev, tmp_skb); |
876 | ||
877 | ddev->skb_add_crc(tmp_skb); | |
878 | ||
384ab1d1 MG |
879 | ddev->saved_skb = skb_get(tmp_skb); |
880 | ddev->saved_skb_len = tmp_skb->len; | |
881 | ||
3bd2a5bc MG |
882 | rc = digital_in_send_cmd(ddev, tmp_skb, 1500, digital_in_recv_dep_res, |
883 | data_exch); | |
884 | if (rc) { | |
885 | if (tmp_skb != skb) | |
886 | kfree_skb(tmp_skb); | |
887 | ||
888 | kfree_skb(chaining_skb); | |
889 | ddev->chaining_skb = NULL; | |
384ab1d1 MG |
890 | |
891 | kfree_skb(ddev->saved_skb); | |
892 | ddev->saved_skb = NULL; | |
3bd2a5bc MG |
893 | } |
894 | ||
895 | return rc; | |
7d0911c0 | 896 | } |
1c7a4c24 | 897 | |
b711ad52 TE |
898 | static void digital_tg_set_rf_tech(struct nfc_digital_dev *ddev, u8 rf_tech) |
899 | { | |
900 | ddev->curr_rf_tech = rf_tech; | |
901 | ||
902 | ddev->skb_add_crc = digital_skb_add_crc_none; | |
903 | ddev->skb_check_crc = digital_skb_check_crc_none; | |
904 | ||
905 | if (DIGITAL_DRV_CAPS_TG_CRC(ddev)) | |
906 | return; | |
907 | ||
908 | switch (ddev->curr_rf_tech) { | |
909 | case NFC_DIGITAL_RF_TECH_106A: | |
910 | ddev->skb_add_crc = digital_skb_add_crc_a; | |
911 | ddev->skb_check_crc = digital_skb_check_crc_a; | |
912 | break; | |
913 | ||
914 | case NFC_DIGITAL_RF_TECH_212F: | |
915 | case NFC_DIGITAL_RF_TECH_424F: | |
916 | ddev->skb_add_crc = digital_skb_add_crc_f; | |
917 | ddev->skb_check_crc = digital_skb_check_crc_f; | |
918 | break; | |
919 | ||
920 | default: | |
921 | break; | |
922 | } | |
923 | } | |
924 | ||
c12715ab MG |
925 | static int digital_tg_send_ack(struct nfc_digital_dev *ddev, |
926 | struct digital_data_exch *data_exch) | |
927 | { | |
928 | struct digital_dep_req_res *dep_res; | |
929 | struct sk_buff *skb; | |
930 | int rc; | |
931 | ||
932 | skb = digital_skb_alloc(ddev, 1); | |
933 | if (!skb) | |
934 | return -ENOMEM; | |
935 | ||
936 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
937 | ||
938 | dep_res = (struct digital_dep_req_res *)skb->data; | |
939 | ||
940 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
941 | dep_res->cmd = DIGITAL_CMD_DEP_RES; | |
942 | dep_res->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | | |
943 | ddev->curr_nfc_dep_pni; | |
944 | ||
945 | if (ddev->did) { | |
946 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; | |
947 | ||
948 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, | |
949 | sizeof(ddev->did)); | |
950 | } | |
951 | ||
952 | ddev->curr_nfc_dep_pni = | |
953 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
954 | ||
955 | digital_skb_push_dep_sod(ddev, skb); | |
956 | ||
957 | ddev->skb_add_crc(skb); | |
958 | ||
49dbb14e MG |
959 | ddev->saved_skb = skb_get(skb); |
960 | ddev->saved_skb_len = skb->len; | |
961 | ||
c12715ab MG |
962 | rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, |
963 | data_exch); | |
49dbb14e | 964 | if (rc) { |
c12715ab | 965 | kfree_skb(skb); |
49dbb14e MG |
966 | kfree_skb(ddev->saved_skb); |
967 | ddev->saved_skb = NULL; | |
968 | } | |
c12715ab MG |
969 | |
970 | return rc; | |
971 | } | |
972 | ||
9b5ec0fd MG |
973 | static int digital_tg_send_atn(struct nfc_digital_dev *ddev) |
974 | { | |
975 | struct digital_dep_req_res *dep_res; | |
976 | struct sk_buff *skb; | |
977 | int rc; | |
978 | ||
979 | skb = digital_skb_alloc(ddev, 1); | |
980 | if (!skb) | |
981 | return -ENOMEM; | |
982 | ||
983 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
984 | ||
985 | dep_res = (struct digital_dep_req_res *)skb->data; | |
986 | ||
987 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
988 | dep_res->cmd = DIGITAL_CMD_DEP_RES; | |
989 | dep_res->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU; | |
990 | ||
991 | if (ddev->did) { | |
992 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; | |
993 | ||
994 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, | |
995 | sizeof(ddev->did)); | |
996 | } | |
997 | ||
998 | digital_skb_push_dep_sod(ddev, skb); | |
999 | ||
1000 | ddev->skb_add_crc(skb); | |
1001 | ||
1002 | rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, | |
1003 | NULL); | |
1004 | if (rc) | |
1005 | kfree_skb(skb); | |
1006 | ||
1007 | return rc; | |
1008 | } | |
1009 | ||
49dbb14e MG |
1010 | static int digital_tg_send_saved_skb(struct nfc_digital_dev *ddev) |
1011 | { | |
1012 | skb_get(ddev->saved_skb); | |
1013 | skb_push(ddev->saved_skb, ddev->saved_skb_len); | |
1014 | ||
1015 | return digital_tg_send_cmd(ddev, ddev->saved_skb, 1500, | |
1016 | digital_tg_recv_dep_req, NULL); | |
1017 | } | |
1018 | ||
1c7a4c24 TE |
1019 | static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, |
1020 | struct sk_buff *resp) | |
1021 | { | |
1022 | int rc; | |
1023 | struct digital_dep_req_res *dep_req; | |
6ce30668 | 1024 | u8 pfb; |
1c7a4c24 TE |
1025 | size_t size; |
1026 | ||
1027 | if (IS_ERR(resp)) { | |
1028 | rc = PTR_ERR(resp); | |
1029 | resp = NULL; | |
1030 | goto exit; | |
1031 | } | |
1032 | ||
1033 | rc = ddev->skb_check_crc(resp); | |
1034 | if (rc) { | |
1035 | PROTOCOL_ERR("14.4.1.6"); | |
1036 | goto exit; | |
1037 | } | |
1038 | ||
1039 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
1040 | if (rc) { | |
1041 | PROTOCOL_ERR("14.4.1.2"); | |
1042 | goto exit; | |
1043 | } | |
1044 | ||
b08147cb MG |
1045 | if (resp->len > ddev->local_payload_max) { |
1046 | rc = -EMSGSIZE; | |
1047 | goto exit; | |
1048 | } | |
1049 | ||
1c7a4c24 TE |
1050 | size = sizeof(struct digital_dep_req_res); |
1051 | dep_req = (struct digital_dep_req_res *)resp->data; | |
1052 | ||
1053 | if (resp->len < size || dep_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
1054 | dep_req->cmd != DIGITAL_CMD_DEP_REQ) { | |
1055 | rc = -EIO; | |
1056 | goto exit; | |
1057 | } | |
1058 | ||
6ce30668 MG |
1059 | pfb = dep_req->pfb; |
1060 | ||
05afedcb MG |
1061 | if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { |
1062 | if (ddev->did && (ddev->did == resp->data[3])) { | |
1063 | size++; | |
1064 | } else { | |
1065 | rc = -EIO; | |
1066 | goto exit; | |
1067 | } | |
1068 | } else if (ddev->did) { | |
1069 | rc = -EIO; | |
1070 | goto exit; | |
1071 | } | |
1c7a4c24 | 1072 | |
3e6b0de8 MG |
1073 | if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) { |
1074 | rc = -EIO; | |
1075 | goto exit; | |
1076 | } | |
1077 | ||
6ce30668 | 1078 | if (size > resp->len) { |
1c7a4c24 TE |
1079 | rc = -EIO; |
1080 | goto exit; | |
1081 | } | |
1082 | ||
6ce30668 MG |
1083 | skb_pull(resp, size); |
1084 | ||
1085 | switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { | |
1c7a4c24 | 1086 | case DIGITAL_NFC_DEP_PFB_I_PDU: |
26042530 | 1087 | pr_debug("DIGITAL_NFC_DEP_PFB_I_PDU\n"); |
485fdc9b | 1088 | |
9b5ec0fd MG |
1089 | if ((ddev->atn_count && (DIGITAL_NFC_DEP_PFB_PNI(pfb - 1) != |
1090 | ddev->curr_nfc_dep_pni)) || | |
1091 | (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni)) { | |
485fdc9b MG |
1092 | PROTOCOL_ERR("14.12.3.4"); |
1093 | rc = -EIO; | |
1094 | goto exit; | |
1095 | } | |
1096 | ||
9b5ec0fd MG |
1097 | if (ddev->atn_count) { |
1098 | ddev->atn_count = 0; | |
1099 | ||
1100 | rc = digital_tg_send_saved_skb(ddev); | |
1101 | if (rc) | |
1102 | goto exit; | |
1103 | ||
1104 | return; | |
1105 | } | |
1106 | ||
49dbb14e MG |
1107 | kfree_skb(ddev->saved_skb); |
1108 | ddev->saved_skb = NULL; | |
1109 | ||
c12715ab MG |
1110 | resp = digital_recv_dep_data_gather(ddev, pfb, resp, |
1111 | digital_tg_send_ack, NULL); | |
1112 | if (IS_ERR(resp)) { | |
1113 | rc = PTR_ERR(resp); | |
1114 | resp = NULL; | |
1115 | goto exit; | |
1116 | } | |
1117 | ||
1118 | /* If resp is NULL then we're still chaining so return and | |
1119 | * wait for the next part of the PDU. Else, the PDU is | |
1120 | * complete so pass it up. | |
1121 | */ | |
1122 | if (!resp) | |
1123 | return; | |
1124 | ||
485fdc9b | 1125 | rc = 0; |
1c7a4c24 TE |
1126 | break; |
1127 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: | |
49dbb14e | 1128 | if (!DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { /* ACK */ |
9b5ec0fd MG |
1129 | if ((ddev->atn_count && |
1130 | (DIGITAL_NFC_DEP_PFB_PNI(pfb - 1) != | |
1131 | ddev->curr_nfc_dep_pni)) || | |
1132 | (DIGITAL_NFC_DEP_PFB_PNI(pfb) != | |
49dbb14e MG |
1133 | ddev->curr_nfc_dep_pni) || |
1134 | !ddev->chaining_skb || !ddev->saved_skb) { | |
1135 | rc = -EIO; | |
1136 | goto exit; | |
1137 | } | |
1138 | ||
9b5ec0fd MG |
1139 | if (ddev->atn_count) { |
1140 | ddev->atn_count = 0; | |
1141 | ||
1142 | rc = digital_tg_send_saved_skb(ddev); | |
1143 | if (rc) | |
1144 | goto exit; | |
1145 | ||
1146 | return; | |
1147 | } | |
1148 | ||
49dbb14e MG |
1149 | kfree_skb(ddev->saved_skb); |
1150 | ddev->saved_skb = NULL; | |
485fdc9b | 1151 | |
3bd2a5bc MG |
1152 | rc = digital_tg_send_dep_res(ddev, ddev->chaining_skb); |
1153 | if (rc) | |
1154 | goto exit; | |
49dbb14e MG |
1155 | } else { /* NACK */ |
1156 | if ((DIGITAL_NFC_DEP_PFB_PNI(pfb + 1) != | |
1157 | ddev->curr_nfc_dep_pni) || | |
1158 | !ddev->saved_skb) { | |
1159 | rc = -EIO; | |
1160 | goto exit; | |
1161 | } | |
3bd2a5bc | 1162 | |
9b5ec0fd MG |
1163 | ddev->atn_count = 0; |
1164 | ||
49dbb14e MG |
1165 | rc = digital_tg_send_saved_skb(ddev); |
1166 | if (rc) { | |
1167 | kfree_skb(ddev->saved_skb); | |
1168 | goto exit; | |
1169 | } | |
3bd2a5bc MG |
1170 | } |
1171 | ||
49dbb14e | 1172 | return; |
1c7a4c24 | 1173 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: |
9b5ec0fd MG |
1174 | if (DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { |
1175 | rc = -EINVAL; | |
1176 | goto exit; | |
1177 | } | |
1178 | ||
1179 | rc = digital_tg_send_atn(ddev); | |
1180 | if (rc) | |
1181 | goto exit; | |
1182 | ||
1183 | ddev->atn_count++; | |
1184 | ||
1185 | kfree_skb(resp); | |
1186 | return; | |
1c7a4c24 TE |
1187 | } |
1188 | ||
1c7a4c24 TE |
1189 | rc = nfc_tm_data_received(ddev->nfc_dev, resp); |
1190 | ||
1191 | exit: | |
3bd2a5bc MG |
1192 | kfree_skb(ddev->chaining_skb); |
1193 | ddev->chaining_skb = NULL; | |
1194 | ||
9b5ec0fd MG |
1195 | ddev->atn_count = 0; |
1196 | ||
49dbb14e MG |
1197 | kfree_skb(ddev->saved_skb); |
1198 | ddev->saved_skb = NULL; | |
1199 | ||
1c7a4c24 TE |
1200 | if (rc) |
1201 | kfree_skb(resp); | |
1202 | } | |
1203 | ||
1204 | int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb) | |
1205 | { | |
1206 | struct digital_dep_req_res *dep_res; | |
3bd2a5bc MG |
1207 | struct sk_buff *chaining_skb, *tmp_skb; |
1208 | int rc; | |
1c7a4c24 TE |
1209 | |
1210 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
b08147cb | 1211 | |
1c7a4c24 TE |
1212 | dep_res = (struct digital_dep_req_res *)skb->data; |
1213 | ||
1214 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
1215 | dep_res->cmd = DIGITAL_CMD_DEP_RES; | |
1216 | dep_res->pfb = ddev->curr_nfc_dep_pni; | |
1217 | ||
05afedcb MG |
1218 | if (ddev->did) { |
1219 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; | |
1220 | ||
1221 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, | |
1222 | sizeof(ddev->did)); | |
1223 | } | |
1224 | ||
485fdc9b MG |
1225 | ddev->curr_nfc_dep_pni = |
1226 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
1227 | ||
3bd2a5bc | 1228 | chaining_skb = ddev->chaining_skb; |
1c7a4c24 | 1229 | |
3bd2a5bc MG |
1230 | tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_res, NULL); |
1231 | if (IS_ERR(tmp_skb)) | |
1232 | return PTR_ERR(tmp_skb); | |
1233 | ||
1234 | digital_skb_push_dep_sod(ddev, tmp_skb); | |
1235 | ||
1236 | ddev->skb_add_crc(tmp_skb); | |
1c7a4c24 | 1237 | |
49dbb14e MG |
1238 | ddev->saved_skb = skb_get(tmp_skb); |
1239 | ddev->saved_skb_len = tmp_skb->len; | |
1240 | ||
3bd2a5bc MG |
1241 | rc = digital_tg_send_cmd(ddev, tmp_skb, 1500, digital_tg_recv_dep_req, |
1242 | NULL); | |
1243 | if (rc) { | |
1244 | if (tmp_skb != skb) | |
1245 | kfree_skb(tmp_skb); | |
1246 | ||
1247 | kfree_skb(chaining_skb); | |
1248 | ddev->chaining_skb = NULL; | |
49dbb14e MG |
1249 | |
1250 | kfree_skb(ddev->saved_skb); | |
1251 | ddev->saved_skb = NULL; | |
3bd2a5bc MG |
1252 | } |
1253 | ||
1254 | return rc; | |
1c7a4c24 TE |
1255 | } |
1256 | ||
1257 | static void digital_tg_send_psl_res_complete(struct nfc_digital_dev *ddev, | |
1258 | void *arg, struct sk_buff *resp) | |
1259 | { | |
67af1d7a | 1260 | u8 rf_tech = (unsigned long)arg; |
1c7a4c24 TE |
1261 | |
1262 | if (IS_ERR(resp)) | |
1263 | return; | |
1264 | ||
b711ad52 TE |
1265 | digital_tg_set_rf_tech(ddev, rf_tech); |
1266 | ||
1c7a4c24 TE |
1267 | digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); |
1268 | ||
1269 | digital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL); | |
1270 | ||
1271 | dev_kfree_skb(resp); | |
1272 | } | |
1273 | ||
1274 | static int digital_tg_send_psl_res(struct nfc_digital_dev *ddev, u8 did, | |
1275 | u8 rf_tech) | |
1276 | { | |
1277 | struct digital_psl_res *psl_res; | |
1278 | struct sk_buff *skb; | |
1279 | int rc; | |
1280 | ||
1281 | skb = digital_skb_alloc(ddev, sizeof(struct digital_psl_res)); | |
1282 | if (!skb) | |
1283 | return -ENOMEM; | |
1284 | ||
1285 | skb_put(skb, sizeof(struct digital_psl_res)); | |
1286 | ||
1287 | psl_res = (struct digital_psl_res *)skb->data; | |
1288 | ||
1289 | psl_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
1290 | psl_res->cmd = DIGITAL_CMD_PSL_RES; | |
1291 | psl_res->did = did; | |
1292 | ||
1293 | digital_skb_push_dep_sod(ddev, skb); | |
1294 | ||
1295 | ddev->skb_add_crc(skb); | |
1296 | ||
485fdc9b MG |
1297 | ddev->curr_nfc_dep_pni = 0; |
1298 | ||
1c7a4c24 | 1299 | rc = digital_tg_send_cmd(ddev, skb, 0, digital_tg_send_psl_res_complete, |
67af1d7a | 1300 | (void *)(unsigned long)rf_tech); |
1c7a4c24 TE |
1301 | if (rc) |
1302 | kfree_skb(skb); | |
1303 | ||
1304 | return rc; | |
1305 | } | |
1306 | ||
1307 | static void digital_tg_recv_psl_req(struct nfc_digital_dev *ddev, void *arg, | |
1308 | struct sk_buff *resp) | |
1309 | { | |
1310 | int rc; | |
1311 | struct digital_psl_req *psl_req; | |
1312 | u8 rf_tech; | |
b08147cb | 1313 | u8 dsi, payload_size, payload_bits; |
1c7a4c24 TE |
1314 | |
1315 | if (IS_ERR(resp)) { | |
1316 | rc = PTR_ERR(resp); | |
1317 | resp = NULL; | |
1318 | goto exit; | |
1319 | } | |
1320 | ||
1321 | rc = ddev->skb_check_crc(resp); | |
1322 | if (rc) { | |
1323 | PROTOCOL_ERR("14.4.1.6"); | |
1324 | goto exit; | |
1325 | } | |
1326 | ||
1327 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
1328 | if (rc) { | |
1329 | PROTOCOL_ERR("14.4.1.2"); | |
1330 | goto exit; | |
1331 | } | |
1332 | ||
1333 | psl_req = (struct digital_psl_req *)resp->data; | |
1334 | ||
1335 | if (resp->len != sizeof(struct digital_psl_req) || | |
1336 | psl_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
1337 | psl_req->cmd != DIGITAL_CMD_PSL_REQ) { | |
1338 | rc = -EIO; | |
1339 | goto exit; | |
1340 | } | |
1341 | ||
1342 | dsi = (psl_req->brs >> 3) & 0x07; | |
1343 | switch (dsi) { | |
1344 | case 0: | |
1345 | rf_tech = NFC_DIGITAL_RF_TECH_106A; | |
1346 | break; | |
1347 | case 1: | |
1348 | rf_tech = NFC_DIGITAL_RF_TECH_212F; | |
1349 | break; | |
1350 | case 2: | |
1351 | rf_tech = NFC_DIGITAL_RF_TECH_424F; | |
1352 | break; | |
1353 | default: | |
77d84ff8 | 1354 | pr_err("Unsupported dsi value %d\n", dsi); |
1c7a4c24 TE |
1355 | goto exit; |
1356 | } | |
1357 | ||
b08147cb MG |
1358 | payload_bits = DIGITAL_PAYLOAD_FSL_TO_BITS(psl_req->fsl); |
1359 | payload_size = digital_payload_bits_to_size(payload_bits); | |
1360 | ||
1361 | if (!payload_size || (payload_size > min(ddev->local_payload_max, | |
1362 | ddev->remote_payload_max))) { | |
1363 | rc = -EINVAL; | |
1364 | goto exit; | |
1365 | } | |
1366 | ||
1367 | ddev->local_payload_max = payload_size; | |
1368 | ddev->remote_payload_max = payload_size; | |
1369 | ||
1c7a4c24 TE |
1370 | rc = digital_tg_send_psl_res(ddev, psl_req->did, rf_tech); |
1371 | ||
1372 | exit: | |
1373 | kfree_skb(resp); | |
1374 | } | |
1375 | ||
1376 | static void digital_tg_send_atr_res_complete(struct nfc_digital_dev *ddev, | |
1377 | void *arg, struct sk_buff *resp) | |
1378 | { | |
1379 | int offset; | |
1380 | ||
1381 | if (IS_ERR(resp)) { | |
1382 | digital_poll_next_tech(ddev); | |
1383 | return; | |
1384 | } | |
1385 | ||
1386 | offset = 2; | |
1387 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) | |
1388 | offset++; | |
1389 | ||
9b5ec0fd MG |
1390 | ddev->atn_count = 0; |
1391 | ||
1c7a4c24 TE |
1392 | if (resp->data[offset] == DIGITAL_CMD_PSL_REQ) |
1393 | digital_tg_recv_psl_req(ddev, arg, resp); | |
1394 | else | |
1395 | digital_tg_recv_dep_req(ddev, arg, resp); | |
1396 | } | |
1397 | ||
1398 | static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev, | |
1399 | struct digital_atr_req *atr_req) | |
1400 | { | |
1401 | struct digital_atr_res *atr_res; | |
1402 | struct sk_buff *skb; | |
b08147cb | 1403 | u8 *gb, payload_bits; |
1c7a4c24 TE |
1404 | size_t gb_len; |
1405 | int rc; | |
1406 | ||
1407 | gb = nfc_get_local_general_bytes(ddev->nfc_dev, &gb_len); | |
1408 | if (!gb) | |
1409 | gb_len = 0; | |
1410 | ||
1411 | skb = digital_skb_alloc(ddev, sizeof(struct digital_atr_res) + gb_len); | |
1412 | if (!skb) | |
1413 | return -ENOMEM; | |
1414 | ||
1415 | skb_put(skb, sizeof(struct digital_atr_res)); | |
1416 | atr_res = (struct digital_atr_res *)skb->data; | |
1417 | ||
1418 | memset(atr_res, 0, sizeof(struct digital_atr_res)); | |
1419 | ||
1420 | atr_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
1421 | atr_res->cmd = DIGITAL_CMD_ATR_RES; | |
1422 | memcpy(atr_res->nfcid3, atr_req->nfcid3, sizeof(atr_req->nfcid3)); | |
1423 | atr_res->to = 8; | |
b08147cb MG |
1424 | |
1425 | ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; | |
1426 | payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); | |
1427 | atr_res->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); | |
1428 | ||
1c7a4c24 TE |
1429 | if (gb_len) { |
1430 | skb_put(skb, gb_len); | |
1431 | ||
1432 | atr_res->pp |= DIGITAL_GB_BIT; | |
1433 | memcpy(atr_res->gb, gb, gb_len); | |
1434 | } | |
1435 | ||
1436 | digital_skb_push_dep_sod(ddev, skb); | |
1437 | ||
1438 | ddev->skb_add_crc(skb); | |
1439 | ||
485fdc9b MG |
1440 | ddev->curr_nfc_dep_pni = 0; |
1441 | ||
1c7a4c24 TE |
1442 | rc = digital_tg_send_cmd(ddev, skb, 999, |
1443 | digital_tg_send_atr_res_complete, NULL); | |
b15829ba | 1444 | if (rc) |
1c7a4c24 | 1445 | kfree_skb(skb); |
1c7a4c24 TE |
1446 | |
1447 | return rc; | |
1448 | } | |
1449 | ||
1450 | void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg, | |
1451 | struct sk_buff *resp) | |
1452 | { | |
1453 | int rc; | |
1454 | struct digital_atr_req *atr_req; | |
1455 | size_t gb_len, min_size; | |
b08147cb | 1456 | u8 poll_tech_count, payload_bits; |
1c7a4c24 TE |
1457 | |
1458 | if (IS_ERR(resp)) { | |
1459 | rc = PTR_ERR(resp); | |
1460 | resp = NULL; | |
1461 | goto exit; | |
1462 | } | |
1463 | ||
1464 | if (!resp->len) { | |
1465 | rc = -EIO; | |
1466 | goto exit; | |
1467 | } | |
1468 | ||
1469 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) { | |
1470 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 2; | |
b711ad52 | 1471 | digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_106A); |
1c7a4c24 TE |
1472 | } else { |
1473 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 1; | |
b711ad52 | 1474 | digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_212F); |
1c7a4c24 TE |
1475 | } |
1476 | ||
1477 | if (resp->len < min_size) { | |
1478 | rc = -EIO; | |
1479 | goto exit; | |
1480 | } | |
1481 | ||
48e10445 | 1482 | ddev->curr_protocol = NFC_PROTO_NFC_DEP_MASK; |
1c7a4c24 TE |
1483 | |
1484 | rc = ddev->skb_check_crc(resp); | |
1485 | if (rc) { | |
1486 | PROTOCOL_ERR("14.4.1.6"); | |
1487 | goto exit; | |
1488 | } | |
1489 | ||
1490 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
1491 | if (rc) { | |
1492 | PROTOCOL_ERR("14.4.1.2"); | |
1493 | goto exit; | |
1494 | } | |
1495 | ||
1496 | atr_req = (struct digital_atr_req *)resp->data; | |
1497 | ||
1498 | if (atr_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
05afedcb MG |
1499 | atr_req->cmd != DIGITAL_CMD_ATR_REQ || |
1500 | atr_req->did > DIGITAL_DID_MAX) { | |
1c7a4c24 TE |
1501 | rc = -EINVAL; |
1502 | goto exit; | |
1503 | } | |
1504 | ||
b08147cb MG |
1505 | payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_req->pp); |
1506 | ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); | |
1507 | ||
1508 | if (!ddev->remote_payload_max) { | |
1509 | rc = -EINVAL; | |
1510 | goto exit; | |
1511 | } | |
1512 | ||
05afedcb MG |
1513 | ddev->did = atr_req->did; |
1514 | ||
1c7a4c24 TE |
1515 | rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, |
1516 | NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED); | |
1517 | if (rc) | |
1518 | goto exit; | |
1519 | ||
1520 | rc = digital_tg_send_atr_res(ddev, atr_req); | |
1521 | if (rc) | |
1522 | goto exit; | |
1523 | ||
1524 | gb_len = resp->len - sizeof(struct digital_atr_req); | |
0529a7ad MG |
1525 | |
1526 | poll_tech_count = ddev->poll_tech_count; | |
1527 | ddev->poll_tech_count = 0; | |
1528 | ||
1c7a4c24 TE |
1529 | rc = nfc_tm_activated(ddev->nfc_dev, NFC_PROTO_NFC_DEP_MASK, |
1530 | NFC_COMM_PASSIVE, atr_req->gb, gb_len); | |
0529a7ad MG |
1531 | if (rc) { |
1532 | ddev->poll_tech_count = poll_tech_count; | |
1c7a4c24 | 1533 | goto exit; |
0529a7ad | 1534 | } |
1c7a4c24 TE |
1535 | |
1536 | rc = 0; | |
1537 | exit: | |
1538 | if (rc) | |
1539 | digital_poll_next_tech(ddev); | |
1540 | ||
1541 | dev_kfree_skb(resp); | |
1542 | } |