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 | ||
3bd2a5bc MG |
193 | memcpy(skb_put(new_skb, ddev->remote_payload_max), skb->data, |
194 | ddev->remote_payload_max); | |
195 | skb_pull(skb, ddev->remote_payload_max); | |
196 | ||
197 | ddev->chaining_skb = skb; | |
198 | ddev->data_exch = data_exch; | |
199 | } else { | |
200 | ddev->chaining_skb = NULL; | |
201 | new_skb = skb; | |
202 | } | |
203 | ||
204 | return new_skb; | |
205 | } | |
206 | ||
c12715ab MG |
207 | static struct sk_buff * |
208 | digital_recv_dep_data_gather(struct nfc_digital_dev *ddev, u8 pfb, | |
209 | struct sk_buff *resp, | |
210 | int (*send_ack)(struct nfc_digital_dev *ddev, | |
211 | struct digital_data_exch | |
212 | *data_exch), | |
213 | struct digital_data_exch *data_exch) | |
214 | { | |
215 | struct sk_buff *new_skb; | |
216 | int rc; | |
217 | ||
218 | if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb) && (!ddev->chaining_skb)) { | |
219 | ddev->chaining_skb = | |
220 | nfc_alloc_recv_skb(8 * ddev->local_payload_max, | |
221 | GFP_KERNEL); | |
222 | if (!ddev->chaining_skb) { | |
223 | rc = -ENOMEM; | |
224 | goto error; | |
225 | } | |
226 | } | |
227 | ||
228 | if (ddev->chaining_skb) { | |
229 | if (resp->len > skb_tailroom(ddev->chaining_skb)) { | |
230 | new_skb = skb_copy_expand(ddev->chaining_skb, | |
231 | skb_headroom( | |
232 | ddev->chaining_skb), | |
233 | 8 * ddev->local_payload_max, | |
234 | GFP_KERNEL); | |
235 | if (!new_skb) { | |
236 | rc = -ENOMEM; | |
237 | goto error; | |
238 | } | |
239 | ||
240 | kfree_skb(ddev->chaining_skb); | |
241 | ddev->chaining_skb = new_skb; | |
242 | } | |
243 | ||
244 | memcpy(skb_put(ddev->chaining_skb, resp->len), resp->data, | |
245 | resp->len); | |
246 | ||
247 | kfree_skb(resp); | |
248 | resp = NULL; | |
249 | ||
250 | if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb)) { | |
251 | rc = send_ack(ddev, data_exch); | |
252 | if (rc) | |
253 | goto error; | |
254 | ||
255 | return NULL; | |
256 | } | |
257 | ||
258 | resp = ddev->chaining_skb; | |
259 | ddev->chaining_skb = NULL; | |
260 | } | |
261 | ||
262 | return resp; | |
263 | ||
264 | error: | |
265 | kfree_skb(resp); | |
266 | ||
267 | kfree_skb(ddev->chaining_skb); | |
268 | ddev->chaining_skb = NULL; | |
269 | ||
270 | return ERR_PTR(rc); | |
271 | } | |
272 | ||
dddb3da0 MG |
273 | static void digital_in_recv_psl_res(struct nfc_digital_dev *ddev, void *arg, |
274 | struct sk_buff *resp) | |
275 | { | |
276 | struct nfc_target *target = arg; | |
277 | struct digital_psl_res *psl_res; | |
278 | int rc; | |
279 | ||
280 | if (IS_ERR(resp)) { | |
281 | rc = PTR_ERR(resp); | |
282 | resp = NULL; | |
283 | goto exit; | |
284 | } | |
285 | ||
286 | rc = ddev->skb_check_crc(resp); | |
287 | if (rc) { | |
288 | PROTOCOL_ERR("14.4.1.6"); | |
289 | goto exit; | |
290 | } | |
291 | ||
292 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
293 | if (rc) { | |
294 | PROTOCOL_ERR("14.4.1.2"); | |
295 | goto exit; | |
296 | } | |
297 | ||
298 | psl_res = (struct digital_psl_res *)resp->data; | |
299 | ||
300 | if ((resp->len != sizeof(*psl_res)) || | |
301 | (psl_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN) || | |
302 | (psl_res->cmd != DIGITAL_CMD_PSL_RES)) { | |
303 | rc = -EIO; | |
304 | goto exit; | |
305 | } | |
306 | ||
307 | rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, | |
308 | NFC_DIGITAL_RF_TECH_424F); | |
309 | if (rc) | |
310 | goto exit; | |
311 | ||
312 | rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, | |
313 | NFC_DIGITAL_FRAMING_NFCF_NFC_DEP); | |
314 | if (rc) | |
315 | goto exit; | |
316 | ||
317 | if (!DIGITAL_DRV_CAPS_IN_CRC(ddev) && | |
318 | (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)) { | |
319 | ddev->skb_add_crc = digital_skb_add_crc_f; | |
320 | ddev->skb_check_crc = digital_skb_check_crc_f; | |
321 | } | |
322 | ||
323 | ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_424F; | |
324 | ||
325 | nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, | |
326 | NFC_RF_INITIATOR); | |
327 | ||
328 | ddev->curr_nfc_dep_pni = 0; | |
329 | ||
330 | exit: | |
331 | dev_kfree_skb(resp); | |
332 | ||
333 | if (rc) | |
334 | ddev->curr_protocol = 0; | |
335 | } | |
336 | ||
337 | static int digital_in_send_psl_req(struct nfc_digital_dev *ddev, | |
338 | struct nfc_target *target) | |
339 | { | |
340 | struct sk_buff *skb; | |
341 | struct digital_psl_req *psl_req; | |
b15829ba | 342 | int rc; |
b08147cb | 343 | u8 payload_size, payload_bits; |
dddb3da0 MG |
344 | |
345 | skb = digital_skb_alloc(ddev, sizeof(*psl_req)); | |
346 | if (!skb) | |
347 | return -ENOMEM; | |
348 | ||
349 | skb_put(skb, sizeof(*psl_req)); | |
350 | ||
351 | psl_req = (struct digital_psl_req *)skb->data; | |
352 | ||
353 | psl_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
354 | psl_req->cmd = DIGITAL_CMD_PSL_REQ; | |
355 | psl_req->did = 0; | |
356 | psl_req->brs = (0x2 << 3) | 0x2; /* 424F both directions */ | |
b08147cb MG |
357 | |
358 | payload_size = min(ddev->local_payload_max, ddev->remote_payload_max); | |
359 | payload_bits = digital_payload_size_to_bits(payload_size); | |
360 | psl_req->fsl = DIGITAL_PAYLOAD_BITS_TO_FSL(payload_bits); | |
361 | ||
362 | ddev->local_payload_max = payload_size; | |
363 | ddev->remote_payload_max = payload_size; | |
dddb3da0 MG |
364 | |
365 | digital_skb_push_dep_sod(ddev, skb); | |
366 | ||
367 | ddev->skb_add_crc(skb); | |
368 | ||
b15829ba MG |
369 | rc = digital_in_send_cmd(ddev, skb, 500, digital_in_recv_psl_res, |
370 | target); | |
371 | if (rc) | |
372 | kfree_skb(skb); | |
373 | ||
374 | return rc; | |
dddb3da0 MG |
375 | } |
376 | ||
7d0911c0 TE |
377 | static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg, |
378 | struct sk_buff *resp) | |
379 | { | |
380 | struct nfc_target *target = arg; | |
381 | struct digital_atr_res *atr_res; | |
b08147cb | 382 | u8 gb_len, payload_bits; |
7d0911c0 TE |
383 | int rc; |
384 | ||
385 | if (IS_ERR(resp)) { | |
386 | rc = PTR_ERR(resp); | |
387 | resp = NULL; | |
388 | goto exit; | |
389 | } | |
390 | ||
391 | rc = ddev->skb_check_crc(resp); | |
392 | if (rc) { | |
393 | PROTOCOL_ERR("14.4.1.6"); | |
394 | goto exit; | |
395 | } | |
396 | ||
397 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
398 | if (rc) { | |
399 | PROTOCOL_ERR("14.4.1.2"); | |
400 | goto exit; | |
401 | } | |
402 | ||
403 | if (resp->len < sizeof(struct digital_atr_res)) { | |
404 | rc = -EIO; | |
405 | goto exit; | |
406 | } | |
407 | ||
408 | gb_len = resp->len - sizeof(struct digital_atr_res); | |
409 | ||
410 | atr_res = (struct digital_atr_res *)resp->data; | |
411 | ||
b08147cb MG |
412 | payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_res->pp); |
413 | ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); | |
414 | ||
415 | if (!ddev->remote_payload_max) { | |
416 | rc = -EINVAL; | |
417 | goto exit; | |
418 | } | |
419 | ||
7d0911c0 TE |
420 | rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len); |
421 | if (rc) | |
422 | goto exit; | |
423 | ||
dddb3da0 MG |
424 | if ((ddev->protocols & NFC_PROTO_FELICA_MASK) && |
425 | (ddev->curr_rf_tech != NFC_DIGITAL_RF_TECH_424F)) { | |
426 | rc = digital_in_send_psl_req(ddev, target); | |
427 | if (!rc) | |
428 | goto exit; | |
429 | } | |
430 | ||
7d0911c0 TE |
431 | rc = nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, |
432 | NFC_RF_INITIATOR); | |
433 | ||
434 | ddev->curr_nfc_dep_pni = 0; | |
435 | ||
436 | exit: | |
437 | dev_kfree_skb(resp); | |
438 | ||
439 | if (rc) | |
440 | ddev->curr_protocol = 0; | |
441 | } | |
442 | ||
443 | int digital_in_send_atr_req(struct nfc_digital_dev *ddev, | |
444 | struct nfc_target *target, __u8 comm_mode, __u8 *gb, | |
445 | size_t gb_len) | |
446 | { | |
447 | struct sk_buff *skb; | |
448 | struct digital_atr_req *atr_req; | |
449 | uint size; | |
b15829ba | 450 | int rc; |
b08147cb | 451 | u8 payload_bits; |
7d0911c0 TE |
452 | |
453 | size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len; | |
454 | ||
455 | if (size > DIGITAL_ATR_REQ_MAX_SIZE) { | |
456 | PROTOCOL_ERR("14.6.1.1"); | |
457 | return -EINVAL; | |
458 | } | |
459 | ||
460 | skb = digital_skb_alloc(ddev, size); | |
461 | if (!skb) | |
462 | return -ENOMEM; | |
463 | ||
464 | skb_put(skb, sizeof(struct digital_atr_req)); | |
465 | ||
466 | atr_req = (struct digital_atr_req *)skb->data; | |
467 | memset(atr_req, 0, sizeof(struct digital_atr_req)); | |
468 | ||
469 | atr_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
470 | atr_req->cmd = DIGITAL_CMD_ATR_REQ; | |
471 | if (target->nfcid2_len) | |
4f319e32 | 472 | memcpy(atr_req->nfcid3, target->nfcid2, NFC_NFCID2_MAXSIZE); |
7d0911c0 | 473 | else |
4f319e32 | 474 | get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE); |
7d0911c0 TE |
475 | |
476 | atr_req->did = 0; | |
477 | atr_req->bs = 0; | |
478 | atr_req->br = 0; | |
479 | ||
b08147cb MG |
480 | ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; |
481 | payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); | |
482 | atr_req->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); | |
7d0911c0 TE |
483 | |
484 | if (gb_len) { | |
485 | atr_req->pp |= DIGITAL_GB_BIT; | |
486 | memcpy(skb_put(skb, gb_len), gb, gb_len); | |
487 | } | |
488 | ||
489 | digital_skb_push_dep_sod(ddev, skb); | |
490 | ||
491 | ddev->skb_add_crc(skb); | |
492 | ||
b15829ba MG |
493 | rc = digital_in_send_cmd(ddev, skb, 500, digital_in_recv_atr_res, |
494 | target); | |
495 | if (rc) | |
496 | kfree_skb(skb); | |
497 | ||
498 | return rc; | |
7d0911c0 TE |
499 | } |
500 | ||
c12715ab MG |
501 | static int digital_in_send_ack(struct nfc_digital_dev *ddev, |
502 | struct digital_data_exch *data_exch) | |
503 | { | |
504 | struct digital_dep_req_res *dep_req; | |
505 | struct sk_buff *skb; | |
506 | int rc; | |
507 | ||
508 | skb = digital_skb_alloc(ddev, 1); | |
509 | if (!skb) | |
510 | return -ENOMEM; | |
511 | ||
512 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
513 | ||
514 | dep_req = (struct digital_dep_req_res *)skb->data; | |
515 | ||
516 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
517 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
518 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | | |
519 | ddev->curr_nfc_dep_pni; | |
520 | ||
521 | digital_skb_push_dep_sod(ddev, skb); | |
522 | ||
523 | ddev->skb_add_crc(skb); | |
524 | ||
1d984c2e | 525 | ddev->saved_skb = pskb_copy(skb, GFP_KERNEL); |
384ab1d1 | 526 | |
c12715ab MG |
527 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, |
528 | data_exch); | |
384ab1d1 | 529 | if (rc) { |
c12715ab | 530 | kfree_skb(skb); |
384ab1d1 MG |
531 | kfree_skb(ddev->saved_skb); |
532 | ddev->saved_skb = NULL; | |
533 | } | |
c12715ab MG |
534 | |
535 | return rc; | |
536 | } | |
537 | ||
a80509c7 MG |
538 | static int digital_in_send_nack(struct nfc_digital_dev *ddev, |
539 | struct digital_data_exch *data_exch) | |
540 | { | |
541 | struct digital_dep_req_res *dep_req; | |
542 | struct sk_buff *skb; | |
543 | int rc; | |
544 | ||
545 | skb = digital_skb_alloc(ddev, 1); | |
546 | if (!skb) | |
547 | return -ENOMEM; | |
548 | ||
549 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
550 | ||
551 | dep_req = (struct digital_dep_req_res *)skb->data; | |
552 | ||
553 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
554 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
555 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | | |
556 | DIGITAL_NFC_DEP_PFB_NACK_BIT | ddev->curr_nfc_dep_pni; | |
557 | ||
558 | digital_skb_push_dep_sod(ddev, skb); | |
559 | ||
560 | ddev->skb_add_crc(skb); | |
561 | ||
562 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, | |
563 | data_exch); | |
564 | if (rc) | |
565 | kfree_skb(skb); | |
566 | ||
567 | return rc; | |
568 | } | |
569 | ||
384ab1d1 MG |
570 | static int digital_in_send_atn(struct nfc_digital_dev *ddev, |
571 | struct digital_data_exch *data_exch) | |
572 | { | |
573 | struct digital_dep_req_res *dep_req; | |
574 | struct sk_buff *skb; | |
575 | int rc; | |
576 | ||
577 | skb = digital_skb_alloc(ddev, 1); | |
578 | if (!skb) | |
579 | return -ENOMEM; | |
580 | ||
581 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
582 | ||
583 | dep_req = (struct digital_dep_req_res *)skb->data; | |
584 | ||
585 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
586 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
587 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU; | |
588 | ||
589 | digital_skb_push_dep_sod(ddev, skb); | |
590 | ||
591 | ddev->skb_add_crc(skb); | |
592 | ||
593 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, | |
594 | data_exch); | |
595 | if (rc) | |
596 | kfree_skb(skb); | |
597 | ||
598 | return rc; | |
599 | } | |
600 | ||
7d0911c0 TE |
601 | static int digital_in_send_rtox(struct nfc_digital_dev *ddev, |
602 | struct digital_data_exch *data_exch, u8 rtox) | |
603 | { | |
604 | struct digital_dep_req_res *dep_req; | |
605 | struct sk_buff *skb; | |
606 | int rc; | |
607 | ||
608 | skb = digital_skb_alloc(ddev, 1); | |
609 | if (!skb) | |
610 | return -ENOMEM; | |
611 | ||
612 | *skb_put(skb, 1) = rtox; | |
613 | ||
614 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
615 | ||
616 | dep_req = (struct digital_dep_req_res *)skb->data; | |
617 | ||
618 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
619 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
620 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU | | |
621 | DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT; | |
622 | ||
623 | digital_skb_push_dep_sod(ddev, skb); | |
624 | ||
625 | ddev->skb_add_crc(skb); | |
626 | ||
627 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, | |
628 | data_exch); | |
1d984c2e | 629 | if (rc) |
b15829ba | 630 | kfree_skb(skb); |
7d0911c0 TE |
631 | |
632 | return rc; | |
633 | } | |
634 | ||
384ab1d1 MG |
635 | static int digital_in_send_saved_skb(struct nfc_digital_dev *ddev, |
636 | struct digital_data_exch *data_exch) | |
637 | { | |
1d984c2e TE |
638 | int rc; |
639 | ||
640 | if (!ddev->saved_skb) | |
641 | return -EINVAL; | |
642 | ||
384ab1d1 | 643 | skb_get(ddev->saved_skb); |
384ab1d1 | 644 | |
1d984c2e TE |
645 | rc = digital_in_send_cmd(ddev, ddev->saved_skb, 1500, |
646 | digital_in_recv_dep_res, data_exch); | |
647 | if (rc) | |
648 | kfree_skb(ddev->saved_skb); | |
649 | ||
650 | return rc; | |
384ab1d1 MG |
651 | } |
652 | ||
7d0911c0 TE |
653 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, |
654 | struct sk_buff *resp) | |
655 | { | |
656 | struct digital_data_exch *data_exch = arg; | |
657 | struct digital_dep_req_res *dep_res; | |
658 | u8 pfb; | |
659 | uint size; | |
660 | int rc; | |
661 | ||
662 | if (IS_ERR(resp)) { | |
663 | rc = PTR_ERR(resp); | |
664 | resp = NULL; | |
a80509c7 | 665 | |
3f89fea3 | 666 | if ((rc == -EIO || (rc == -ETIMEDOUT && ddev->nack_count)) && |
a80509c7 | 667 | (ddev->nack_count++ < DIGITAL_NFC_DEP_N_RETRY_NACK)) { |
384ab1d1 MG |
668 | ddev->atn_count = 0; |
669 | ||
a80509c7 MG |
670 | rc = digital_in_send_nack(ddev, data_exch); |
671 | if (rc) | |
672 | goto error; | |
673 | ||
384ab1d1 MG |
674 | return; |
675 | } else if ((rc == -ETIMEDOUT) && | |
676 | (ddev->atn_count++ < DIGITAL_NFC_DEP_N_RETRY_ATN)) { | |
677 | ddev->nack_count = 0; | |
678 | ||
679 | rc = digital_in_send_atn(ddev, data_exch); | |
680 | if (rc) | |
681 | goto error; | |
682 | ||
a80509c7 MG |
683 | return; |
684 | } | |
685 | ||
686 | goto exit; | |
687 | } | |
688 | ||
689 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
690 | if (rc) { | |
691 | PROTOCOL_ERR("14.4.1.2"); | |
7d0911c0 TE |
692 | goto exit; |
693 | } | |
694 | ||
695 | rc = ddev->skb_check_crc(resp); | |
696 | if (rc) { | |
a80509c7 MG |
697 | if ((resp->len >= 4) && |
698 | (ddev->nack_count++ < DIGITAL_NFC_DEP_N_RETRY_NACK)) { | |
384ab1d1 MG |
699 | ddev->atn_count = 0; |
700 | ||
a80509c7 MG |
701 | rc = digital_in_send_nack(ddev, data_exch); |
702 | if (rc) | |
703 | goto error; | |
704 | ||
705 | kfree_skb(resp); | |
706 | ||
707 | return; | |
708 | } | |
709 | ||
7d0911c0 TE |
710 | PROTOCOL_ERR("14.4.1.6"); |
711 | goto error; | |
712 | } | |
713 | ||
384ab1d1 | 714 | ddev->atn_count = 0; |
a80509c7 | 715 | ddev->nack_count = 0; |
7d0911c0 | 716 | |
b08147cb MG |
717 | if (resp->len > ddev->local_payload_max) { |
718 | rc = -EMSGSIZE; | |
719 | goto exit; | |
720 | } | |
721 | ||
6ce30668 | 722 | size = sizeof(struct digital_dep_req_res); |
7d0911c0 TE |
723 | dep_res = (struct digital_dep_req_res *)resp->data; |
724 | ||
6ce30668 | 725 | if (resp->len < size || dep_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN || |
7d0911c0 TE |
726 | dep_res->cmd != DIGITAL_CMD_DEP_RES) { |
727 | rc = -EIO; | |
728 | goto error; | |
729 | } | |
730 | ||
731 | pfb = dep_res->pfb; | |
732 | ||
3bc3f88a MG |
733 | if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { |
734 | PROTOCOL_ERR("14.8.2.1"); | |
735 | rc = -EIO; | |
736 | goto error; | |
737 | } | |
6ce30668 | 738 | |
3e6b0de8 MG |
739 | if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) { |
740 | rc = -EIO; | |
741 | goto exit; | |
742 | } | |
743 | ||
6ce30668 MG |
744 | if (size > resp->len) { |
745 | rc = -EIO; | |
746 | goto error; | |
747 | } | |
748 | ||
749 | skb_pull(resp, size); | |
750 | ||
7d0911c0 TE |
751 | switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { |
752 | case DIGITAL_NFC_DEP_PFB_I_PDU: | |
753 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { | |
754 | PROTOCOL_ERR("14.12.3.3"); | |
755 | rc = -EIO; | |
756 | goto error; | |
757 | } | |
758 | ||
759 | ddev->curr_nfc_dep_pni = | |
760 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
c12715ab | 761 | |
384ab1d1 MG |
762 | kfree_skb(ddev->saved_skb); |
763 | ddev->saved_skb = NULL; | |
764 | ||
c12715ab MG |
765 | resp = digital_recv_dep_data_gather(ddev, pfb, resp, |
766 | digital_in_send_ack, | |
767 | data_exch); | |
768 | if (IS_ERR(resp)) { | |
769 | rc = PTR_ERR(resp); | |
770 | resp = NULL; | |
771 | goto error; | |
772 | } | |
773 | ||
774 | /* If resp is NULL then we're still chaining so return and | |
775 | * wait for the next part of the PDU. Else, the PDU is | |
776 | * complete so pass it up. | |
777 | */ | |
778 | if (!resp) | |
779 | return; | |
780 | ||
7d0911c0 TE |
781 | rc = 0; |
782 | break; | |
783 | ||
784 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: | |
485fdc9b MG |
785 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { |
786 | PROTOCOL_ERR("14.12.3.3"); | |
787 | rc = -EIO; | |
788 | goto exit; | |
789 | } | |
790 | ||
791 | ddev->curr_nfc_dep_pni = | |
792 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
793 | ||
3bd2a5bc | 794 | if (ddev->chaining_skb && !DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { |
384ab1d1 MG |
795 | kfree_skb(ddev->saved_skb); |
796 | ddev->saved_skb = NULL; | |
797 | ||
3bd2a5bc MG |
798 | rc = digital_in_send_dep_req(ddev, NULL, |
799 | ddev->chaining_skb, | |
800 | ddev->data_exch); | |
801 | if (rc) | |
802 | goto error; | |
803 | ||
804 | return; | |
805 | } | |
806 | ||
807 | pr_err("Received a ACK/NACK PDU\n"); | |
485fdc9b MG |
808 | rc = -EINVAL; |
809 | goto exit; | |
7d0911c0 TE |
810 | |
811 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: | |
384ab1d1 MG |
812 | if (!DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { /* ATN */ |
813 | rc = digital_in_send_saved_skb(ddev, data_exch); | |
1d984c2e | 814 | if (rc) |
384ab1d1 | 815 | goto error; |
384ab1d1 MG |
816 | |
817 | return; | |
7d0911c0 TE |
818 | } |
819 | ||
6ce30668 | 820 | rc = digital_in_send_rtox(ddev, data_exch, resp->data[0]); |
7d0911c0 TE |
821 | if (rc) |
822 | goto error; | |
823 | ||
824 | kfree_skb(resp); | |
825 | return; | |
826 | } | |
827 | ||
7d0911c0 TE |
828 | exit: |
829 | data_exch->cb(data_exch->cb_context, resp, rc); | |
830 | ||
831 | error: | |
832 | kfree(data_exch); | |
833 | ||
3bd2a5bc MG |
834 | kfree_skb(ddev->chaining_skb); |
835 | ddev->chaining_skb = NULL; | |
836 | ||
384ab1d1 MG |
837 | kfree_skb(ddev->saved_skb); |
838 | ddev->saved_skb = NULL; | |
839 | ||
7d0911c0 TE |
840 | if (rc) |
841 | kfree_skb(resp); | |
842 | } | |
843 | ||
844 | int digital_in_send_dep_req(struct nfc_digital_dev *ddev, | |
845 | struct nfc_target *target, struct sk_buff *skb, | |
846 | struct digital_data_exch *data_exch) | |
847 | { | |
848 | struct digital_dep_req_res *dep_req; | |
3bd2a5bc MG |
849 | struct sk_buff *chaining_skb, *tmp_skb; |
850 | int rc; | |
7d0911c0 TE |
851 | |
852 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
853 | ||
854 | dep_req = (struct digital_dep_req_res *)skb->data; | |
3bd2a5bc | 855 | |
7d0911c0 TE |
856 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
857 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
858 | dep_req->pfb = ddev->curr_nfc_dep_pni; | |
859 | ||
384ab1d1 | 860 | ddev->atn_count = 0; |
a80509c7 MG |
861 | ddev->nack_count = 0; |
862 | ||
3bd2a5bc | 863 | chaining_skb = ddev->chaining_skb; |
7d0911c0 | 864 | |
3bd2a5bc MG |
865 | tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_req, data_exch); |
866 | if (IS_ERR(tmp_skb)) | |
867 | return PTR_ERR(tmp_skb); | |
7d0911c0 | 868 | |
3bd2a5bc MG |
869 | digital_skb_push_dep_sod(ddev, tmp_skb); |
870 | ||
871 | ddev->skb_add_crc(tmp_skb); | |
872 | ||
1d984c2e | 873 | ddev->saved_skb = pskb_copy(tmp_skb, GFP_KERNEL); |
384ab1d1 | 874 | |
3bd2a5bc MG |
875 | rc = digital_in_send_cmd(ddev, tmp_skb, 1500, digital_in_recv_dep_res, |
876 | data_exch); | |
877 | if (rc) { | |
878 | if (tmp_skb != skb) | |
879 | kfree_skb(tmp_skb); | |
880 | ||
881 | kfree_skb(chaining_skb); | |
882 | ddev->chaining_skb = NULL; | |
384ab1d1 MG |
883 | |
884 | kfree_skb(ddev->saved_skb); | |
885 | ddev->saved_skb = NULL; | |
3bd2a5bc MG |
886 | } |
887 | ||
888 | return rc; | |
7d0911c0 | 889 | } |
1c7a4c24 | 890 | |
b711ad52 TE |
891 | static void digital_tg_set_rf_tech(struct nfc_digital_dev *ddev, u8 rf_tech) |
892 | { | |
893 | ddev->curr_rf_tech = rf_tech; | |
894 | ||
895 | ddev->skb_add_crc = digital_skb_add_crc_none; | |
896 | ddev->skb_check_crc = digital_skb_check_crc_none; | |
897 | ||
898 | if (DIGITAL_DRV_CAPS_TG_CRC(ddev)) | |
899 | return; | |
900 | ||
901 | switch (ddev->curr_rf_tech) { | |
902 | case NFC_DIGITAL_RF_TECH_106A: | |
903 | ddev->skb_add_crc = digital_skb_add_crc_a; | |
904 | ddev->skb_check_crc = digital_skb_check_crc_a; | |
905 | break; | |
906 | ||
907 | case NFC_DIGITAL_RF_TECH_212F: | |
908 | case NFC_DIGITAL_RF_TECH_424F: | |
909 | ddev->skb_add_crc = digital_skb_add_crc_f; | |
910 | ddev->skb_check_crc = digital_skb_check_crc_f; | |
911 | break; | |
912 | ||
913 | default: | |
914 | break; | |
915 | } | |
916 | } | |
917 | ||
c12715ab MG |
918 | static int digital_tg_send_ack(struct nfc_digital_dev *ddev, |
919 | struct digital_data_exch *data_exch) | |
920 | { | |
921 | struct digital_dep_req_res *dep_res; | |
922 | struct sk_buff *skb; | |
923 | int rc; | |
924 | ||
925 | skb = digital_skb_alloc(ddev, 1); | |
926 | if (!skb) | |
927 | return -ENOMEM; | |
928 | ||
929 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
930 | ||
931 | dep_res = (struct digital_dep_req_res *)skb->data; | |
932 | ||
933 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
934 | dep_res->cmd = DIGITAL_CMD_DEP_RES; | |
935 | dep_res->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | | |
936 | ddev->curr_nfc_dep_pni; | |
937 | ||
938 | if (ddev->did) { | |
939 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; | |
940 | ||
941 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, | |
942 | sizeof(ddev->did)); | |
943 | } | |
944 | ||
945 | ddev->curr_nfc_dep_pni = | |
946 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
947 | ||
948 | digital_skb_push_dep_sod(ddev, skb); | |
949 | ||
950 | ddev->skb_add_crc(skb); | |
951 | ||
1d984c2e | 952 | ddev->saved_skb = pskb_copy(skb, GFP_KERNEL); |
49dbb14e | 953 | |
c12715ab MG |
954 | rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, |
955 | data_exch); | |
49dbb14e | 956 | if (rc) { |
c12715ab | 957 | kfree_skb(skb); |
49dbb14e MG |
958 | kfree_skb(ddev->saved_skb); |
959 | ddev->saved_skb = NULL; | |
960 | } | |
c12715ab MG |
961 | |
962 | return rc; | |
963 | } | |
964 | ||
9b5ec0fd MG |
965 | static int digital_tg_send_atn(struct nfc_digital_dev *ddev) |
966 | { | |
967 | struct digital_dep_req_res *dep_res; | |
968 | struct sk_buff *skb; | |
969 | int rc; | |
970 | ||
971 | skb = digital_skb_alloc(ddev, 1); | |
972 | if (!skb) | |
973 | return -ENOMEM; | |
974 | ||
975 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
976 | ||
977 | dep_res = (struct digital_dep_req_res *)skb->data; | |
978 | ||
979 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
980 | dep_res->cmd = DIGITAL_CMD_DEP_RES; | |
981 | dep_res->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU; | |
982 | ||
983 | if (ddev->did) { | |
984 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; | |
985 | ||
986 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, | |
987 | sizeof(ddev->did)); | |
988 | } | |
989 | ||
990 | digital_skb_push_dep_sod(ddev, skb); | |
991 | ||
992 | ddev->skb_add_crc(skb); | |
993 | ||
994 | rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, | |
995 | NULL); | |
996 | if (rc) | |
997 | kfree_skb(skb); | |
998 | ||
999 | return rc; | |
1000 | } | |
1001 | ||
49dbb14e MG |
1002 | static int digital_tg_send_saved_skb(struct nfc_digital_dev *ddev) |
1003 | { | |
1d984c2e TE |
1004 | int rc; |
1005 | ||
1006 | if (!ddev->saved_skb) | |
1007 | return -EINVAL; | |
1008 | ||
49dbb14e | 1009 | skb_get(ddev->saved_skb); |
49dbb14e | 1010 | |
1d984c2e TE |
1011 | rc = digital_tg_send_cmd(ddev, ddev->saved_skb, 1500, |
1012 | digital_tg_recv_dep_req, NULL); | |
1013 | if (rc) | |
1014 | kfree_skb(ddev->saved_skb); | |
1015 | ||
1016 | return rc; | |
49dbb14e MG |
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 | 1089 | if (ddev->atn_count) { |
f23a9868 TE |
1090 | /* The target has received (and replied to) at least one |
1091 | * ATN DEP_REQ. | |
1092 | */ | |
9b5ec0fd MG |
1093 | ddev->atn_count = 0; |
1094 | ||
f23a9868 TE |
1095 | /* pni of resp PDU equal to the target current pni - 1 |
1096 | * means resp is the previous DEP_REQ PDU received from | |
1097 | * the initiator so the target replies with saved_skb | |
1098 | * which is the previous DEP_RES saved in | |
1099 | * digital_tg_send_dep_res(). | |
1100 | */ | |
1101 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) == | |
1102 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni - 1)) { | |
1103 | rc = digital_tg_send_saved_skb(ddev); | |
1104 | if (rc) | |
1105 | goto exit; | |
9b5ec0fd | 1106 | |
f23a9868 TE |
1107 | goto free_resp; |
1108 | } | |
1109 | ||
1110 | /* atn_count > 0 and PDU pni != curr_nfc_dep_pni - 1 | |
1111 | * means the target probably did not received the last | |
1112 | * DEP_REQ PDU sent by the initiator. The target | |
1113 | * fallbacks to normal processing then. | |
1114 | */ | |
1115 | } | |
1116 | ||
1117 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { | |
1118 | PROTOCOL_ERR("14.12.3.4"); | |
1119 | rc = -EIO; | |
1120 | goto exit; | |
9b5ec0fd MG |
1121 | } |
1122 | ||
49dbb14e MG |
1123 | kfree_skb(ddev->saved_skb); |
1124 | ddev->saved_skb = NULL; | |
1125 | ||
c12715ab MG |
1126 | resp = digital_recv_dep_data_gather(ddev, pfb, resp, |
1127 | digital_tg_send_ack, NULL); | |
1128 | if (IS_ERR(resp)) { | |
1129 | rc = PTR_ERR(resp); | |
1130 | resp = NULL; | |
1131 | goto exit; | |
1132 | } | |
1133 | ||
1134 | /* If resp is NULL then we're still chaining so return and | |
1135 | * wait for the next part of the PDU. Else, the PDU is | |
1136 | * complete so pass it up. | |
1137 | */ | |
1138 | if (!resp) | |
1139 | return; | |
1140 | ||
485fdc9b | 1141 | rc = 0; |
1c7a4c24 TE |
1142 | break; |
1143 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: | |
482333b2 TE |
1144 | if (DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { /* NACK */ |
1145 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb + 1) != | |
1146 | ddev->curr_nfc_dep_pni) { | |
49dbb14e MG |
1147 | rc = -EIO; |
1148 | goto exit; | |
1149 | } | |
1150 | ||
482333b2 TE |
1151 | ddev->atn_count = 0; |
1152 | ||
1153 | rc = digital_tg_send_saved_skb(ddev); | |
1154 | if (rc) | |
1155 | goto exit; | |
1156 | ||
1157 | goto free_resp; | |
1158 | } | |
1159 | ||
1160 | /* ACK */ | |
1161 | if (ddev->atn_count) { | |
1162 | /* The target has previously recevied one or more ATN | |
1163 | * PDUs. | |
1164 | */ | |
1165 | ddev->atn_count = 0; | |
9b5ec0fd | 1166 | |
482333b2 TE |
1167 | /* If the ACK PNI is equal to the target PNI - 1 means |
1168 | * that the initiator did not receive the previous PDU | |
1169 | * sent by the target so re-send it. | |
1170 | */ | |
1171 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb + 1) == | |
1172 | ddev->curr_nfc_dep_pni) { | |
9b5ec0fd MG |
1173 | rc = digital_tg_send_saved_skb(ddev); |
1174 | if (rc) | |
1175 | goto exit; | |
1176 | ||
482333b2 | 1177 | goto free_resp; |
9b5ec0fd MG |
1178 | } |
1179 | ||
482333b2 TE |
1180 | /* Otherwise, the target did not receive the previous |
1181 | * ACK PDU from the initiator. Fallback to normal | |
1182 | * processing of chained PDU then. | |
1183 | */ | |
1184 | } | |
485fdc9b | 1185 | |
482333b2 TE |
1186 | /* Keep on sending chained PDU */ |
1187 | if (!ddev->chaining_skb || | |
1188 | DIGITAL_NFC_DEP_PFB_PNI(pfb) != | |
1189 | ddev->curr_nfc_dep_pni) { | |
1190 | rc = -EIO; | |
1191 | goto exit; | |
1192 | } | |
3bd2a5bc | 1193 | |
482333b2 TE |
1194 | kfree_skb(ddev->saved_skb); |
1195 | ddev->saved_skb = NULL; | |
9b5ec0fd | 1196 | |
482333b2 TE |
1197 | rc = digital_tg_send_dep_res(ddev, ddev->chaining_skb); |
1198 | if (rc) | |
1199 | goto exit; | |
3bd2a5bc | 1200 | |
482333b2 | 1201 | goto free_resp; |
1c7a4c24 | 1202 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: |
9b5ec0fd MG |
1203 | if (DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { |
1204 | rc = -EINVAL; | |
1205 | goto exit; | |
1206 | } | |
1207 | ||
1208 | rc = digital_tg_send_atn(ddev); | |
1209 | if (rc) | |
1210 | goto exit; | |
1211 | ||
1212 | ddev->atn_count++; | |
1213 | ||
1214 | kfree_skb(resp); | |
1215 | return; | |
1c7a4c24 TE |
1216 | } |
1217 | ||
1c7a4c24 TE |
1218 | rc = nfc_tm_data_received(ddev->nfc_dev, resp); |
1219 | ||
1220 | exit: | |
3bd2a5bc MG |
1221 | kfree_skb(ddev->chaining_skb); |
1222 | ddev->chaining_skb = NULL; | |
1223 | ||
9b5ec0fd MG |
1224 | ddev->atn_count = 0; |
1225 | ||
49dbb14e MG |
1226 | kfree_skb(ddev->saved_skb); |
1227 | ddev->saved_skb = NULL; | |
1228 | ||
1c7a4c24 TE |
1229 | if (rc) |
1230 | kfree_skb(resp); | |
f23a9868 TE |
1231 | |
1232 | return; | |
1233 | ||
1234 | free_resp: | |
1235 | dev_kfree_skb(resp); | |
1c7a4c24 TE |
1236 | } |
1237 | ||
1238 | int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb) | |
1239 | { | |
1240 | struct digital_dep_req_res *dep_res; | |
3bd2a5bc MG |
1241 | struct sk_buff *chaining_skb, *tmp_skb; |
1242 | int rc; | |
1c7a4c24 TE |
1243 | |
1244 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
b08147cb | 1245 | |
1c7a4c24 TE |
1246 | dep_res = (struct digital_dep_req_res *)skb->data; |
1247 | ||
1248 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
1249 | dep_res->cmd = DIGITAL_CMD_DEP_RES; | |
1250 | dep_res->pfb = ddev->curr_nfc_dep_pni; | |
1251 | ||
05afedcb MG |
1252 | if (ddev->did) { |
1253 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; | |
1254 | ||
1255 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, | |
1256 | sizeof(ddev->did)); | |
1257 | } | |
1258 | ||
485fdc9b MG |
1259 | ddev->curr_nfc_dep_pni = |
1260 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
1261 | ||
3bd2a5bc | 1262 | chaining_skb = ddev->chaining_skb; |
1c7a4c24 | 1263 | |
3bd2a5bc MG |
1264 | tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_res, NULL); |
1265 | if (IS_ERR(tmp_skb)) | |
1266 | return PTR_ERR(tmp_skb); | |
1267 | ||
1268 | digital_skb_push_dep_sod(ddev, tmp_skb); | |
1269 | ||
1270 | ddev->skb_add_crc(tmp_skb); | |
1c7a4c24 | 1271 | |
1d984c2e | 1272 | ddev->saved_skb = pskb_copy(tmp_skb, GFP_KERNEL); |
49dbb14e | 1273 | |
3bd2a5bc MG |
1274 | rc = digital_tg_send_cmd(ddev, tmp_skb, 1500, digital_tg_recv_dep_req, |
1275 | NULL); | |
1276 | if (rc) { | |
1277 | if (tmp_skb != skb) | |
1278 | kfree_skb(tmp_skb); | |
1279 | ||
1280 | kfree_skb(chaining_skb); | |
1281 | ddev->chaining_skb = NULL; | |
49dbb14e MG |
1282 | |
1283 | kfree_skb(ddev->saved_skb); | |
1284 | ddev->saved_skb = NULL; | |
3bd2a5bc MG |
1285 | } |
1286 | ||
1287 | return rc; | |
1c7a4c24 TE |
1288 | } |
1289 | ||
1290 | static void digital_tg_send_psl_res_complete(struct nfc_digital_dev *ddev, | |
1291 | void *arg, struct sk_buff *resp) | |
1292 | { | |
67af1d7a | 1293 | u8 rf_tech = (unsigned long)arg; |
1c7a4c24 TE |
1294 | |
1295 | if (IS_ERR(resp)) | |
1296 | return; | |
1297 | ||
b711ad52 TE |
1298 | digital_tg_set_rf_tech(ddev, rf_tech); |
1299 | ||
1c7a4c24 TE |
1300 | digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); |
1301 | ||
1302 | digital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL); | |
1303 | ||
1304 | dev_kfree_skb(resp); | |
1305 | } | |
1306 | ||
1307 | static int digital_tg_send_psl_res(struct nfc_digital_dev *ddev, u8 did, | |
1308 | u8 rf_tech) | |
1309 | { | |
1310 | struct digital_psl_res *psl_res; | |
1311 | struct sk_buff *skb; | |
1312 | int rc; | |
1313 | ||
1314 | skb = digital_skb_alloc(ddev, sizeof(struct digital_psl_res)); | |
1315 | if (!skb) | |
1316 | return -ENOMEM; | |
1317 | ||
1318 | skb_put(skb, sizeof(struct digital_psl_res)); | |
1319 | ||
1320 | psl_res = (struct digital_psl_res *)skb->data; | |
1321 | ||
1322 | psl_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
1323 | psl_res->cmd = DIGITAL_CMD_PSL_RES; | |
1324 | psl_res->did = did; | |
1325 | ||
1326 | digital_skb_push_dep_sod(ddev, skb); | |
1327 | ||
1328 | ddev->skb_add_crc(skb); | |
1329 | ||
485fdc9b MG |
1330 | ddev->curr_nfc_dep_pni = 0; |
1331 | ||
1c7a4c24 | 1332 | rc = digital_tg_send_cmd(ddev, skb, 0, digital_tg_send_psl_res_complete, |
67af1d7a | 1333 | (void *)(unsigned long)rf_tech); |
1c7a4c24 TE |
1334 | if (rc) |
1335 | kfree_skb(skb); | |
1336 | ||
1337 | return rc; | |
1338 | } | |
1339 | ||
1340 | static void digital_tg_recv_psl_req(struct nfc_digital_dev *ddev, void *arg, | |
1341 | struct sk_buff *resp) | |
1342 | { | |
1343 | int rc; | |
1344 | struct digital_psl_req *psl_req; | |
1345 | u8 rf_tech; | |
b08147cb | 1346 | u8 dsi, payload_size, payload_bits; |
1c7a4c24 TE |
1347 | |
1348 | if (IS_ERR(resp)) { | |
1349 | rc = PTR_ERR(resp); | |
1350 | resp = NULL; | |
1351 | goto exit; | |
1352 | } | |
1353 | ||
1354 | rc = ddev->skb_check_crc(resp); | |
1355 | if (rc) { | |
1356 | PROTOCOL_ERR("14.4.1.6"); | |
1357 | goto exit; | |
1358 | } | |
1359 | ||
1360 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
1361 | if (rc) { | |
1362 | PROTOCOL_ERR("14.4.1.2"); | |
1363 | goto exit; | |
1364 | } | |
1365 | ||
1366 | psl_req = (struct digital_psl_req *)resp->data; | |
1367 | ||
1368 | if (resp->len != sizeof(struct digital_psl_req) || | |
1369 | psl_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
1370 | psl_req->cmd != DIGITAL_CMD_PSL_REQ) { | |
1371 | rc = -EIO; | |
1372 | goto exit; | |
1373 | } | |
1374 | ||
1375 | dsi = (psl_req->brs >> 3) & 0x07; | |
1376 | switch (dsi) { | |
1377 | case 0: | |
1378 | rf_tech = NFC_DIGITAL_RF_TECH_106A; | |
1379 | break; | |
1380 | case 1: | |
1381 | rf_tech = NFC_DIGITAL_RF_TECH_212F; | |
1382 | break; | |
1383 | case 2: | |
1384 | rf_tech = NFC_DIGITAL_RF_TECH_424F; | |
1385 | break; | |
1386 | default: | |
77d84ff8 | 1387 | pr_err("Unsupported dsi value %d\n", dsi); |
1c7a4c24 TE |
1388 | goto exit; |
1389 | } | |
1390 | ||
b08147cb MG |
1391 | payload_bits = DIGITAL_PAYLOAD_FSL_TO_BITS(psl_req->fsl); |
1392 | payload_size = digital_payload_bits_to_size(payload_bits); | |
1393 | ||
1394 | if (!payload_size || (payload_size > min(ddev->local_payload_max, | |
1395 | ddev->remote_payload_max))) { | |
1396 | rc = -EINVAL; | |
1397 | goto exit; | |
1398 | } | |
1399 | ||
1400 | ddev->local_payload_max = payload_size; | |
1401 | ddev->remote_payload_max = payload_size; | |
1402 | ||
1c7a4c24 TE |
1403 | rc = digital_tg_send_psl_res(ddev, psl_req->did, rf_tech); |
1404 | ||
1405 | exit: | |
1406 | kfree_skb(resp); | |
1407 | } | |
1408 | ||
1409 | static void digital_tg_send_atr_res_complete(struct nfc_digital_dev *ddev, | |
1410 | void *arg, struct sk_buff *resp) | |
1411 | { | |
1412 | int offset; | |
1413 | ||
1414 | if (IS_ERR(resp)) { | |
1415 | digital_poll_next_tech(ddev); | |
1416 | return; | |
1417 | } | |
1418 | ||
1419 | offset = 2; | |
1420 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) | |
1421 | offset++; | |
1422 | ||
9b5ec0fd MG |
1423 | ddev->atn_count = 0; |
1424 | ||
1c7a4c24 TE |
1425 | if (resp->data[offset] == DIGITAL_CMD_PSL_REQ) |
1426 | digital_tg_recv_psl_req(ddev, arg, resp); | |
1427 | else | |
1428 | digital_tg_recv_dep_req(ddev, arg, resp); | |
1429 | } | |
1430 | ||
1431 | static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev, | |
1432 | struct digital_atr_req *atr_req) | |
1433 | { | |
1434 | struct digital_atr_res *atr_res; | |
1435 | struct sk_buff *skb; | |
b08147cb | 1436 | u8 *gb, payload_bits; |
1c7a4c24 TE |
1437 | size_t gb_len; |
1438 | int rc; | |
1439 | ||
1440 | gb = nfc_get_local_general_bytes(ddev->nfc_dev, &gb_len); | |
1441 | if (!gb) | |
1442 | gb_len = 0; | |
1443 | ||
1444 | skb = digital_skb_alloc(ddev, sizeof(struct digital_atr_res) + gb_len); | |
1445 | if (!skb) | |
1446 | return -ENOMEM; | |
1447 | ||
1448 | skb_put(skb, sizeof(struct digital_atr_res)); | |
1449 | atr_res = (struct digital_atr_res *)skb->data; | |
1450 | ||
1451 | memset(atr_res, 0, sizeof(struct digital_atr_res)); | |
1452 | ||
1453 | atr_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
1454 | atr_res->cmd = DIGITAL_CMD_ATR_RES; | |
1455 | memcpy(atr_res->nfcid3, atr_req->nfcid3, sizeof(atr_req->nfcid3)); | |
1456 | atr_res->to = 8; | |
b08147cb MG |
1457 | |
1458 | ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; | |
1459 | payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); | |
1460 | atr_res->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); | |
1461 | ||
1c7a4c24 TE |
1462 | if (gb_len) { |
1463 | skb_put(skb, gb_len); | |
1464 | ||
1465 | atr_res->pp |= DIGITAL_GB_BIT; | |
1466 | memcpy(atr_res->gb, gb, gb_len); | |
1467 | } | |
1468 | ||
1469 | digital_skb_push_dep_sod(ddev, skb); | |
1470 | ||
1471 | ddev->skb_add_crc(skb); | |
1472 | ||
485fdc9b MG |
1473 | ddev->curr_nfc_dep_pni = 0; |
1474 | ||
1c7a4c24 TE |
1475 | rc = digital_tg_send_cmd(ddev, skb, 999, |
1476 | digital_tg_send_atr_res_complete, NULL); | |
b15829ba | 1477 | if (rc) |
1c7a4c24 | 1478 | kfree_skb(skb); |
1c7a4c24 TE |
1479 | |
1480 | return rc; | |
1481 | } | |
1482 | ||
1483 | void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg, | |
1484 | struct sk_buff *resp) | |
1485 | { | |
1486 | int rc; | |
1487 | struct digital_atr_req *atr_req; | |
1488 | size_t gb_len, min_size; | |
b08147cb | 1489 | u8 poll_tech_count, payload_bits; |
1c7a4c24 TE |
1490 | |
1491 | if (IS_ERR(resp)) { | |
1492 | rc = PTR_ERR(resp); | |
1493 | resp = NULL; | |
1494 | goto exit; | |
1495 | } | |
1496 | ||
1497 | if (!resp->len) { | |
1498 | rc = -EIO; | |
1499 | goto exit; | |
1500 | } | |
1501 | ||
1502 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) { | |
1503 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 2; | |
b711ad52 | 1504 | digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_106A); |
1c7a4c24 TE |
1505 | } else { |
1506 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 1; | |
b711ad52 | 1507 | digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_212F); |
1c7a4c24 TE |
1508 | } |
1509 | ||
1510 | if (resp->len < min_size) { | |
1511 | rc = -EIO; | |
1512 | goto exit; | |
1513 | } | |
1514 | ||
48e10445 | 1515 | ddev->curr_protocol = NFC_PROTO_NFC_DEP_MASK; |
1c7a4c24 TE |
1516 | |
1517 | rc = ddev->skb_check_crc(resp); | |
1518 | if (rc) { | |
1519 | PROTOCOL_ERR("14.4.1.6"); | |
1520 | goto exit; | |
1521 | } | |
1522 | ||
1523 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
1524 | if (rc) { | |
1525 | PROTOCOL_ERR("14.4.1.2"); | |
1526 | goto exit; | |
1527 | } | |
1528 | ||
1529 | atr_req = (struct digital_atr_req *)resp->data; | |
1530 | ||
1531 | if (atr_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
05afedcb MG |
1532 | atr_req->cmd != DIGITAL_CMD_ATR_REQ || |
1533 | atr_req->did > DIGITAL_DID_MAX) { | |
1c7a4c24 TE |
1534 | rc = -EINVAL; |
1535 | goto exit; | |
1536 | } | |
1537 | ||
b08147cb MG |
1538 | payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_req->pp); |
1539 | ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); | |
1540 | ||
1541 | if (!ddev->remote_payload_max) { | |
1542 | rc = -EINVAL; | |
1543 | goto exit; | |
1544 | } | |
1545 | ||
05afedcb MG |
1546 | ddev->did = atr_req->did; |
1547 | ||
1c7a4c24 TE |
1548 | rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, |
1549 | NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED); | |
1550 | if (rc) | |
1551 | goto exit; | |
1552 | ||
1553 | rc = digital_tg_send_atr_res(ddev, atr_req); | |
1554 | if (rc) | |
1555 | goto exit; | |
1556 | ||
1557 | gb_len = resp->len - sizeof(struct digital_atr_req); | |
0529a7ad MG |
1558 | |
1559 | poll_tech_count = ddev->poll_tech_count; | |
1560 | ddev->poll_tech_count = 0; | |
1561 | ||
1c7a4c24 TE |
1562 | rc = nfc_tm_activated(ddev->nfc_dev, NFC_PROTO_NFC_DEP_MASK, |
1563 | NFC_COMM_PASSIVE, atr_req->gb, gb_len); | |
0529a7ad MG |
1564 | if (rc) { |
1565 | ddev->poll_tech_count = poll_tech_count; | |
1c7a4c24 | 1566 | goto exit; |
0529a7ad | 1567 | } |
1c7a4c24 TE |
1568 | |
1569 | rc = 0; | |
1570 | exit: | |
1571 | if (rc) | |
1572 | digital_poll_next_tech(ddev); | |
1573 | ||
1574 | dev_kfree_skb(resp); | |
1575 | } |