Commit | Line | Data |
---|---|---|
7d0911c0 TE |
1 | /* |
2 | * NFC Digital Protocol stack | |
3 | * Copyright (c) 2013, Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | */ | |
15 | ||
c5da0e4a SO |
16 | #define pr_fmt(fmt) "digital: %s: " fmt, __func__ |
17 | ||
7d0911c0 TE |
18 | #include "digital.h" |
19 | ||
20 | #define DIGITAL_NFC_DEP_FRAME_DIR_OUT 0xD4 | |
21 | #define DIGITAL_NFC_DEP_FRAME_DIR_IN 0xD5 | |
22 | ||
23 | #define DIGITAL_NFC_DEP_NFCA_SOD_SB 0xF0 | |
24 | ||
25 | #define DIGITAL_CMD_ATR_REQ 0x00 | |
26 | #define DIGITAL_CMD_ATR_RES 0x01 | |
27 | #define DIGITAL_CMD_PSL_REQ 0x04 | |
28 | #define DIGITAL_CMD_PSL_RES 0x05 | |
29 | #define DIGITAL_CMD_DEP_REQ 0x06 | |
30 | #define DIGITAL_CMD_DEP_RES 0x07 | |
31 | ||
32 | #define DIGITAL_ATR_REQ_MIN_SIZE 16 | |
33 | #define DIGITAL_ATR_REQ_MAX_SIZE 64 | |
34 | ||
05afedcb MG |
35 | #define DIGITAL_DID_MAX 14 |
36 | ||
b08147cb MG |
37 | #define DIGITAL_PAYLOAD_SIZE_MAX 254 |
38 | #define DIGITAL_PAYLOAD_BITS_TO_PP(s) (((s) & 0x3) << 4) | |
39 | #define DIGITAL_PAYLOAD_PP_TO_BITS(s) (((s) >> 4) & 0x3) | |
40 | #define DIGITAL_PAYLOAD_BITS_TO_FSL(s) ((s) & 0x3) | |
41 | #define DIGITAL_PAYLOAD_FSL_TO_BITS(s) ((s) & 0x3) | |
42 | ||
7d0911c0 TE |
43 | #define DIGITAL_GB_BIT 0x02 |
44 | ||
3bd2a5bc MG |
45 | #define DIGITAL_NFC_DEP_REQ_RES_HEADROOM 2 /* SoD: [SB (NFC-A)] + LEN */ |
46 | #define DIGITAL_NFC_DEP_REQ_RES_TAILROOM 2 /* EoD: 2-byte CRC */ | |
47 | ||
7d0911c0 TE |
48 | #define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0) |
49 | ||
50 | #define DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT 0x10 | |
3bd2a5bc MG |
51 | #define DIGITAL_NFC_DEP_PFB_MI_BIT 0x10 |
52 | #define DIGITAL_NFC_DEP_PFB_NACK_BIT 0x10 | |
05afedcb | 53 | #define DIGITAL_NFC_DEP_PFB_DID_BIT 0x04 |
7d0911c0 TE |
54 | |
55 | #define DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb) \ | |
56 | ((pfb) & DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT) | |
3bd2a5bc MG |
57 | #define DIGITAL_NFC_DEP_MI_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_MI_BIT) |
58 | #define DIGITAL_NFC_DEP_NACK_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_NACK_BIT) | |
7d0911c0 | 59 | #define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08) |
05afedcb | 60 | #define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_DID_BIT) |
7d0911c0 TE |
61 | #define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03) |
62 | ||
63 | #define DIGITAL_NFC_DEP_PFB_I_PDU 0x00 | |
64 | #define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40 | |
65 | #define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80 | |
66 | ||
67 | struct digital_atr_req { | |
68 | u8 dir; | |
69 | u8 cmd; | |
70 | u8 nfcid3[10]; | |
71 | u8 did; | |
72 | u8 bs; | |
73 | u8 br; | |
74 | u8 pp; | |
75 | u8 gb[0]; | |
76 | } __packed; | |
77 | ||
78 | struct digital_atr_res { | |
79 | u8 dir; | |
80 | u8 cmd; | |
81 | u8 nfcid3[10]; | |
82 | u8 did; | |
83 | u8 bs; | |
84 | u8 br; | |
85 | u8 to; | |
86 | u8 pp; | |
87 | u8 gb[0]; | |
88 | } __packed; | |
89 | ||
90 | struct digital_psl_req { | |
91 | u8 dir; | |
92 | u8 cmd; | |
93 | u8 did; | |
94 | u8 brs; | |
95 | u8 fsl; | |
96 | } __packed; | |
97 | ||
98 | struct digital_psl_res { | |
99 | u8 dir; | |
100 | u8 cmd; | |
101 | u8 did; | |
102 | } __packed; | |
103 | ||
104 | struct digital_dep_req_res { | |
105 | u8 dir; | |
106 | u8 cmd; | |
107 | u8 pfb; | |
108 | } __packed; | |
109 | ||
110 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, | |
111 | struct sk_buff *resp); | |
c12715ab MG |
112 | static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, |
113 | struct sk_buff *resp); | |
7d0911c0 | 114 | |
b08147cb MG |
115 | static const u8 digital_payload_bits_map[4] = { |
116 | [0] = 64, | |
117 | [1] = 128, | |
118 | [2] = 192, | |
119 | [3] = 254 | |
120 | }; | |
121 | ||
122 | static u8 digital_payload_bits_to_size(u8 payload_bits) | |
123 | { | |
124 | if (payload_bits >= ARRAY_SIZE(digital_payload_bits_map)) | |
125 | return 0; | |
126 | ||
127 | return digital_payload_bits_map[payload_bits]; | |
128 | } | |
129 | ||
130 | static u8 digital_payload_size_to_bits(u8 payload_size) | |
131 | { | |
132 | int i; | |
133 | ||
134 | for (i = 0; i < ARRAY_SIZE(digital_payload_bits_map); i++) | |
135 | if (digital_payload_bits_map[i] == payload_size) | |
136 | return i; | |
137 | ||
138 | return 0xff; | |
139 | } | |
140 | ||
7d0911c0 TE |
141 | static void digital_skb_push_dep_sod(struct nfc_digital_dev *ddev, |
142 | struct sk_buff *skb) | |
143 | { | |
144 | skb_push(skb, sizeof(u8)); | |
145 | ||
146 | skb->data[0] = skb->len; | |
147 | ||
148 | if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) | |
149 | *skb_push(skb, sizeof(u8)) = DIGITAL_NFC_DEP_NFCA_SOD_SB; | |
150 | } | |
151 | ||
152 | static int digital_skb_pull_dep_sod(struct nfc_digital_dev *ddev, | |
153 | struct sk_buff *skb) | |
154 | { | |
155 | u8 size; | |
156 | ||
157 | if (skb->len < 2) | |
158 | return -EIO; | |
159 | ||
160 | if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) | |
161 | skb_pull(skb, sizeof(u8)); | |
162 | ||
163 | size = skb->data[0]; | |
164 | if (size != skb->len) | |
165 | return -EIO; | |
166 | ||
167 | skb_pull(skb, sizeof(u8)); | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
3bd2a5bc MG |
172 | static struct sk_buff * |
173 | digital_send_dep_data_prep(struct nfc_digital_dev *ddev, struct sk_buff *skb, | |
174 | struct digital_dep_req_res *dep_req_res, | |
175 | struct digital_data_exch *data_exch) | |
176 | { | |
177 | struct sk_buff *new_skb; | |
178 | ||
179 | if (skb->len > ddev->remote_payload_max) { | |
180 | dep_req_res->pfb |= DIGITAL_NFC_DEP_PFB_MI_BIT; | |
181 | ||
182 | new_skb = digital_skb_alloc(ddev, ddev->remote_payload_max); | |
183 | if (!new_skb) { | |
184 | kfree_skb(ddev->chaining_skb); | |
185 | ddev->chaining_skb = NULL; | |
186 | ||
187 | return ERR_PTR(-ENOMEM); | |
188 | } | |
189 | ||
190 | skb_reserve(new_skb, ddev->tx_headroom + NFC_HEADER_SIZE + | |
191 | DIGITAL_NFC_DEP_REQ_RES_HEADROOM); | |
192 | memcpy(skb_put(new_skb, ddev->remote_payload_max), skb->data, | |
193 | ddev->remote_payload_max); | |
194 | skb_pull(skb, ddev->remote_payload_max); | |
195 | ||
196 | ddev->chaining_skb = skb; | |
197 | ddev->data_exch = data_exch; | |
198 | } else { | |
199 | ddev->chaining_skb = NULL; | |
200 | new_skb = skb; | |
201 | } | |
202 | ||
203 | return new_skb; | |
204 | } | |
205 | ||
c12715ab MG |
206 | static struct sk_buff * |
207 | digital_recv_dep_data_gather(struct nfc_digital_dev *ddev, u8 pfb, | |
208 | struct sk_buff *resp, | |
209 | int (*send_ack)(struct nfc_digital_dev *ddev, | |
210 | struct digital_data_exch | |
211 | *data_exch), | |
212 | struct digital_data_exch *data_exch) | |
213 | { | |
214 | struct sk_buff *new_skb; | |
215 | int rc; | |
216 | ||
217 | if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb) && (!ddev->chaining_skb)) { | |
218 | ddev->chaining_skb = | |
219 | nfc_alloc_recv_skb(8 * ddev->local_payload_max, | |
220 | GFP_KERNEL); | |
221 | if (!ddev->chaining_skb) { | |
222 | rc = -ENOMEM; | |
223 | goto error; | |
224 | } | |
225 | } | |
226 | ||
227 | if (ddev->chaining_skb) { | |
228 | if (resp->len > skb_tailroom(ddev->chaining_skb)) { | |
229 | new_skb = skb_copy_expand(ddev->chaining_skb, | |
230 | skb_headroom( | |
231 | ddev->chaining_skb), | |
232 | 8 * ddev->local_payload_max, | |
233 | GFP_KERNEL); | |
234 | if (!new_skb) { | |
235 | rc = -ENOMEM; | |
236 | goto error; | |
237 | } | |
238 | ||
239 | kfree_skb(ddev->chaining_skb); | |
240 | ddev->chaining_skb = new_skb; | |
241 | } | |
242 | ||
243 | memcpy(skb_put(ddev->chaining_skb, resp->len), resp->data, | |
244 | resp->len); | |
245 | ||
246 | kfree_skb(resp); | |
247 | resp = NULL; | |
248 | ||
249 | if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb)) { | |
250 | rc = send_ack(ddev, data_exch); | |
251 | if (rc) | |
252 | goto error; | |
253 | ||
254 | return NULL; | |
255 | } | |
256 | ||
257 | resp = ddev->chaining_skb; | |
258 | ddev->chaining_skb = NULL; | |
259 | } | |
260 | ||
261 | return resp; | |
262 | ||
263 | error: | |
264 | kfree_skb(resp); | |
265 | ||
266 | kfree_skb(ddev->chaining_skb); | |
267 | ddev->chaining_skb = NULL; | |
268 | ||
269 | return ERR_PTR(rc); | |
270 | } | |
271 | ||
dddb3da0 MG |
272 | static void digital_in_recv_psl_res(struct nfc_digital_dev *ddev, void *arg, |
273 | struct sk_buff *resp) | |
274 | { | |
275 | struct nfc_target *target = arg; | |
276 | struct digital_psl_res *psl_res; | |
277 | int rc; | |
278 | ||
279 | if (IS_ERR(resp)) { | |
280 | rc = PTR_ERR(resp); | |
281 | resp = NULL; | |
282 | goto exit; | |
283 | } | |
284 | ||
285 | rc = ddev->skb_check_crc(resp); | |
286 | if (rc) { | |
287 | PROTOCOL_ERR("14.4.1.6"); | |
288 | goto exit; | |
289 | } | |
290 | ||
291 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
292 | if (rc) { | |
293 | PROTOCOL_ERR("14.4.1.2"); | |
294 | goto exit; | |
295 | } | |
296 | ||
297 | psl_res = (struct digital_psl_res *)resp->data; | |
298 | ||
299 | if ((resp->len != sizeof(*psl_res)) || | |
300 | (psl_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN) || | |
301 | (psl_res->cmd != DIGITAL_CMD_PSL_RES)) { | |
302 | rc = -EIO; | |
303 | goto exit; | |
304 | } | |
305 | ||
306 | rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, | |
307 | NFC_DIGITAL_RF_TECH_424F); | |
308 | if (rc) | |
309 | goto exit; | |
310 | ||
311 | rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, | |
312 | NFC_DIGITAL_FRAMING_NFCF_NFC_DEP); | |
313 | if (rc) | |
314 | goto exit; | |
315 | ||
316 | if (!DIGITAL_DRV_CAPS_IN_CRC(ddev) && | |
317 | (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)) { | |
318 | ddev->skb_add_crc = digital_skb_add_crc_f; | |
319 | ddev->skb_check_crc = digital_skb_check_crc_f; | |
320 | } | |
321 | ||
322 | ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_424F; | |
323 | ||
324 | nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, | |
325 | NFC_RF_INITIATOR); | |
326 | ||
327 | ddev->curr_nfc_dep_pni = 0; | |
328 | ||
329 | exit: | |
330 | dev_kfree_skb(resp); | |
331 | ||
332 | if (rc) | |
333 | ddev->curr_protocol = 0; | |
334 | } | |
335 | ||
336 | static int digital_in_send_psl_req(struct nfc_digital_dev *ddev, | |
337 | struct nfc_target *target) | |
338 | { | |
339 | struct sk_buff *skb; | |
340 | struct digital_psl_req *psl_req; | |
b15829ba | 341 | int rc; |
b08147cb | 342 | u8 payload_size, payload_bits; |
dddb3da0 MG |
343 | |
344 | skb = digital_skb_alloc(ddev, sizeof(*psl_req)); | |
345 | if (!skb) | |
346 | return -ENOMEM; | |
347 | ||
348 | skb_put(skb, sizeof(*psl_req)); | |
349 | ||
350 | psl_req = (struct digital_psl_req *)skb->data; | |
351 | ||
352 | psl_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
353 | psl_req->cmd = DIGITAL_CMD_PSL_REQ; | |
354 | psl_req->did = 0; | |
355 | psl_req->brs = (0x2 << 3) | 0x2; /* 424F both directions */ | |
b08147cb MG |
356 | |
357 | payload_size = min(ddev->local_payload_max, ddev->remote_payload_max); | |
358 | payload_bits = digital_payload_size_to_bits(payload_size); | |
359 | psl_req->fsl = DIGITAL_PAYLOAD_BITS_TO_FSL(payload_bits); | |
360 | ||
361 | ddev->local_payload_max = payload_size; | |
362 | ddev->remote_payload_max = payload_size; | |
dddb3da0 MG |
363 | |
364 | digital_skb_push_dep_sod(ddev, skb); | |
365 | ||
366 | ddev->skb_add_crc(skb); | |
367 | ||
b15829ba MG |
368 | rc = digital_in_send_cmd(ddev, skb, 500, digital_in_recv_psl_res, |
369 | target); | |
370 | if (rc) | |
371 | kfree_skb(skb); | |
372 | ||
373 | return rc; | |
dddb3da0 MG |
374 | } |
375 | ||
7d0911c0 TE |
376 | static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg, |
377 | struct sk_buff *resp) | |
378 | { | |
379 | struct nfc_target *target = arg; | |
380 | struct digital_atr_res *atr_res; | |
b08147cb | 381 | u8 gb_len, payload_bits; |
7d0911c0 TE |
382 | int rc; |
383 | ||
384 | if (IS_ERR(resp)) { | |
385 | rc = PTR_ERR(resp); | |
386 | resp = NULL; | |
387 | goto exit; | |
388 | } | |
389 | ||
390 | rc = ddev->skb_check_crc(resp); | |
391 | if (rc) { | |
392 | PROTOCOL_ERR("14.4.1.6"); | |
393 | goto exit; | |
394 | } | |
395 | ||
396 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
397 | if (rc) { | |
398 | PROTOCOL_ERR("14.4.1.2"); | |
399 | goto exit; | |
400 | } | |
401 | ||
402 | if (resp->len < sizeof(struct digital_atr_res)) { | |
403 | rc = -EIO; | |
404 | goto exit; | |
405 | } | |
406 | ||
407 | gb_len = resp->len - sizeof(struct digital_atr_res); | |
408 | ||
409 | atr_res = (struct digital_atr_res *)resp->data; | |
410 | ||
b08147cb MG |
411 | payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_res->pp); |
412 | ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); | |
413 | ||
414 | if (!ddev->remote_payload_max) { | |
415 | rc = -EINVAL; | |
416 | goto exit; | |
417 | } | |
418 | ||
7d0911c0 TE |
419 | rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len); |
420 | if (rc) | |
421 | goto exit; | |
422 | ||
dddb3da0 MG |
423 | if ((ddev->protocols & NFC_PROTO_FELICA_MASK) && |
424 | (ddev->curr_rf_tech != NFC_DIGITAL_RF_TECH_424F)) { | |
425 | rc = digital_in_send_psl_req(ddev, target); | |
426 | if (!rc) | |
427 | goto exit; | |
428 | } | |
429 | ||
7d0911c0 TE |
430 | rc = nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, |
431 | NFC_RF_INITIATOR); | |
432 | ||
433 | ddev->curr_nfc_dep_pni = 0; | |
434 | ||
435 | exit: | |
436 | dev_kfree_skb(resp); | |
437 | ||
438 | if (rc) | |
439 | ddev->curr_protocol = 0; | |
440 | } | |
441 | ||
442 | int digital_in_send_atr_req(struct nfc_digital_dev *ddev, | |
443 | struct nfc_target *target, __u8 comm_mode, __u8 *gb, | |
444 | size_t gb_len) | |
445 | { | |
446 | struct sk_buff *skb; | |
447 | struct digital_atr_req *atr_req; | |
448 | uint size; | |
b15829ba | 449 | int rc; |
b08147cb | 450 | u8 payload_bits; |
7d0911c0 TE |
451 | |
452 | size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len; | |
453 | ||
454 | if (size > DIGITAL_ATR_REQ_MAX_SIZE) { | |
455 | PROTOCOL_ERR("14.6.1.1"); | |
456 | return -EINVAL; | |
457 | } | |
458 | ||
459 | skb = digital_skb_alloc(ddev, size); | |
460 | if (!skb) | |
461 | return -ENOMEM; | |
462 | ||
463 | skb_put(skb, sizeof(struct digital_atr_req)); | |
464 | ||
465 | atr_req = (struct digital_atr_req *)skb->data; | |
466 | memset(atr_req, 0, sizeof(struct digital_atr_req)); | |
467 | ||
468 | atr_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
469 | atr_req->cmd = DIGITAL_CMD_ATR_REQ; | |
470 | if (target->nfcid2_len) | |
4f319e32 | 471 | memcpy(atr_req->nfcid3, target->nfcid2, NFC_NFCID2_MAXSIZE); |
7d0911c0 | 472 | else |
4f319e32 | 473 | get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE); |
7d0911c0 TE |
474 | |
475 | atr_req->did = 0; | |
476 | atr_req->bs = 0; | |
477 | atr_req->br = 0; | |
478 | ||
b08147cb MG |
479 | ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; |
480 | payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); | |
481 | atr_req->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); | |
7d0911c0 TE |
482 | |
483 | if (gb_len) { | |
484 | atr_req->pp |= DIGITAL_GB_BIT; | |
485 | memcpy(skb_put(skb, gb_len), gb, gb_len); | |
486 | } | |
487 | ||
488 | digital_skb_push_dep_sod(ddev, skb); | |
489 | ||
490 | ddev->skb_add_crc(skb); | |
491 | ||
b15829ba MG |
492 | rc = digital_in_send_cmd(ddev, skb, 500, digital_in_recv_atr_res, |
493 | target); | |
494 | if (rc) | |
495 | kfree_skb(skb); | |
496 | ||
497 | return rc; | |
7d0911c0 TE |
498 | } |
499 | ||
c12715ab MG |
500 | static int digital_in_send_ack(struct nfc_digital_dev *ddev, |
501 | struct digital_data_exch *data_exch) | |
502 | { | |
503 | struct digital_dep_req_res *dep_req; | |
504 | struct sk_buff *skb; | |
505 | int rc; | |
506 | ||
507 | skb = digital_skb_alloc(ddev, 1); | |
508 | if (!skb) | |
509 | return -ENOMEM; | |
510 | ||
511 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
512 | ||
513 | dep_req = (struct digital_dep_req_res *)skb->data; | |
514 | ||
515 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
516 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
517 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | | |
518 | ddev->curr_nfc_dep_pni; | |
519 | ||
520 | digital_skb_push_dep_sod(ddev, skb); | |
521 | ||
522 | ddev->skb_add_crc(skb); | |
523 | ||
524 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, | |
525 | data_exch); | |
526 | if (rc) | |
527 | kfree_skb(skb); | |
528 | ||
529 | return rc; | |
530 | } | |
531 | ||
7d0911c0 TE |
532 | static int digital_in_send_rtox(struct nfc_digital_dev *ddev, |
533 | struct digital_data_exch *data_exch, u8 rtox) | |
534 | { | |
535 | struct digital_dep_req_res *dep_req; | |
536 | struct sk_buff *skb; | |
537 | int rc; | |
538 | ||
539 | skb = digital_skb_alloc(ddev, 1); | |
540 | if (!skb) | |
541 | return -ENOMEM; | |
542 | ||
543 | *skb_put(skb, 1) = rtox; | |
544 | ||
545 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
546 | ||
547 | dep_req = (struct digital_dep_req_res *)skb->data; | |
548 | ||
549 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
550 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
551 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU | | |
552 | DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT; | |
553 | ||
554 | digital_skb_push_dep_sod(ddev, skb); | |
555 | ||
556 | ddev->skb_add_crc(skb); | |
557 | ||
558 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, | |
559 | data_exch); | |
b15829ba MG |
560 | if (rc) |
561 | kfree_skb(skb); | |
7d0911c0 TE |
562 | |
563 | return rc; | |
564 | } | |
565 | ||
566 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, | |
567 | struct sk_buff *resp) | |
568 | { | |
569 | struct digital_data_exch *data_exch = arg; | |
570 | struct digital_dep_req_res *dep_res; | |
571 | u8 pfb; | |
572 | uint size; | |
573 | int rc; | |
574 | ||
575 | if (IS_ERR(resp)) { | |
576 | rc = PTR_ERR(resp); | |
577 | resp = NULL; | |
578 | goto exit; | |
579 | } | |
580 | ||
581 | rc = ddev->skb_check_crc(resp); | |
582 | if (rc) { | |
583 | PROTOCOL_ERR("14.4.1.6"); | |
584 | goto error; | |
585 | } | |
586 | ||
587 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
588 | if (rc) { | |
589 | PROTOCOL_ERR("14.4.1.2"); | |
590 | goto exit; | |
591 | } | |
592 | ||
b08147cb MG |
593 | if (resp->len > ddev->local_payload_max) { |
594 | rc = -EMSGSIZE; | |
595 | goto exit; | |
596 | } | |
597 | ||
6ce30668 | 598 | size = sizeof(struct digital_dep_req_res); |
7d0911c0 TE |
599 | dep_res = (struct digital_dep_req_res *)resp->data; |
600 | ||
6ce30668 | 601 | if (resp->len < size || dep_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN || |
7d0911c0 TE |
602 | dep_res->cmd != DIGITAL_CMD_DEP_RES) { |
603 | rc = -EIO; | |
604 | goto error; | |
605 | } | |
606 | ||
607 | pfb = dep_res->pfb; | |
608 | ||
3bc3f88a MG |
609 | if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { |
610 | PROTOCOL_ERR("14.8.2.1"); | |
611 | rc = -EIO; | |
612 | goto error; | |
613 | } | |
6ce30668 | 614 | |
3e6b0de8 MG |
615 | if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) { |
616 | rc = -EIO; | |
617 | goto exit; | |
618 | } | |
619 | ||
6ce30668 MG |
620 | if (size > resp->len) { |
621 | rc = -EIO; | |
622 | goto error; | |
623 | } | |
624 | ||
625 | skb_pull(resp, size); | |
626 | ||
7d0911c0 TE |
627 | switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { |
628 | case DIGITAL_NFC_DEP_PFB_I_PDU: | |
629 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { | |
630 | PROTOCOL_ERR("14.12.3.3"); | |
631 | rc = -EIO; | |
632 | goto error; | |
633 | } | |
634 | ||
635 | ddev->curr_nfc_dep_pni = | |
636 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
c12715ab MG |
637 | |
638 | resp = digital_recv_dep_data_gather(ddev, pfb, resp, | |
639 | digital_in_send_ack, | |
640 | data_exch); | |
641 | if (IS_ERR(resp)) { | |
642 | rc = PTR_ERR(resp); | |
643 | resp = NULL; | |
644 | goto error; | |
645 | } | |
646 | ||
647 | /* If resp is NULL then we're still chaining so return and | |
648 | * wait for the next part of the PDU. Else, the PDU is | |
649 | * complete so pass it up. | |
650 | */ | |
651 | if (!resp) | |
652 | return; | |
653 | ||
7d0911c0 TE |
654 | rc = 0; |
655 | break; | |
656 | ||
657 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: | |
485fdc9b MG |
658 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { |
659 | PROTOCOL_ERR("14.12.3.3"); | |
660 | rc = -EIO; | |
661 | goto exit; | |
662 | } | |
663 | ||
664 | ddev->curr_nfc_dep_pni = | |
665 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
666 | ||
3bd2a5bc MG |
667 | if (ddev->chaining_skb && !DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { |
668 | rc = digital_in_send_dep_req(ddev, NULL, | |
669 | ddev->chaining_skb, | |
670 | ddev->data_exch); | |
671 | if (rc) | |
672 | goto error; | |
673 | ||
674 | return; | |
675 | } | |
676 | ||
677 | pr_err("Received a ACK/NACK PDU\n"); | |
485fdc9b MG |
678 | rc = -EINVAL; |
679 | goto exit; | |
7d0911c0 TE |
680 | |
681 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: | |
682 | if (!DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { | |
683 | rc = -EINVAL; | |
684 | goto error; | |
685 | } | |
686 | ||
6ce30668 | 687 | rc = digital_in_send_rtox(ddev, data_exch, resp->data[0]); |
7d0911c0 TE |
688 | if (rc) |
689 | goto error; | |
690 | ||
691 | kfree_skb(resp); | |
692 | return; | |
693 | } | |
694 | ||
7d0911c0 TE |
695 | exit: |
696 | data_exch->cb(data_exch->cb_context, resp, rc); | |
697 | ||
698 | error: | |
699 | kfree(data_exch); | |
700 | ||
3bd2a5bc MG |
701 | kfree_skb(ddev->chaining_skb); |
702 | ddev->chaining_skb = NULL; | |
703 | ||
7d0911c0 TE |
704 | if (rc) |
705 | kfree_skb(resp); | |
706 | } | |
707 | ||
708 | int digital_in_send_dep_req(struct nfc_digital_dev *ddev, | |
709 | struct nfc_target *target, struct sk_buff *skb, | |
710 | struct digital_data_exch *data_exch) | |
711 | { | |
712 | struct digital_dep_req_res *dep_req; | |
3bd2a5bc MG |
713 | struct sk_buff *chaining_skb, *tmp_skb; |
714 | int rc; | |
7d0911c0 TE |
715 | |
716 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
717 | ||
718 | dep_req = (struct digital_dep_req_res *)skb->data; | |
3bd2a5bc | 719 | |
7d0911c0 TE |
720 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
721 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
722 | dep_req->pfb = ddev->curr_nfc_dep_pni; | |
723 | ||
3bd2a5bc | 724 | chaining_skb = ddev->chaining_skb; |
7d0911c0 | 725 | |
3bd2a5bc MG |
726 | tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_req, data_exch); |
727 | if (IS_ERR(tmp_skb)) | |
728 | return PTR_ERR(tmp_skb); | |
7d0911c0 | 729 | |
3bd2a5bc MG |
730 | digital_skb_push_dep_sod(ddev, tmp_skb); |
731 | ||
732 | ddev->skb_add_crc(tmp_skb); | |
733 | ||
734 | rc = digital_in_send_cmd(ddev, tmp_skb, 1500, digital_in_recv_dep_res, | |
735 | data_exch); | |
736 | if (rc) { | |
737 | if (tmp_skb != skb) | |
738 | kfree_skb(tmp_skb); | |
739 | ||
740 | kfree_skb(chaining_skb); | |
741 | ddev->chaining_skb = NULL; | |
742 | } | |
743 | ||
744 | return rc; | |
7d0911c0 | 745 | } |
1c7a4c24 | 746 | |
b711ad52 TE |
747 | static void digital_tg_set_rf_tech(struct nfc_digital_dev *ddev, u8 rf_tech) |
748 | { | |
749 | ddev->curr_rf_tech = rf_tech; | |
750 | ||
751 | ddev->skb_add_crc = digital_skb_add_crc_none; | |
752 | ddev->skb_check_crc = digital_skb_check_crc_none; | |
753 | ||
754 | if (DIGITAL_DRV_CAPS_TG_CRC(ddev)) | |
755 | return; | |
756 | ||
757 | switch (ddev->curr_rf_tech) { | |
758 | case NFC_DIGITAL_RF_TECH_106A: | |
759 | ddev->skb_add_crc = digital_skb_add_crc_a; | |
760 | ddev->skb_check_crc = digital_skb_check_crc_a; | |
761 | break; | |
762 | ||
763 | case NFC_DIGITAL_RF_TECH_212F: | |
764 | case NFC_DIGITAL_RF_TECH_424F: | |
765 | ddev->skb_add_crc = digital_skb_add_crc_f; | |
766 | ddev->skb_check_crc = digital_skb_check_crc_f; | |
767 | break; | |
768 | ||
769 | default: | |
770 | break; | |
771 | } | |
772 | } | |
773 | ||
c12715ab MG |
774 | static int digital_tg_send_ack(struct nfc_digital_dev *ddev, |
775 | struct digital_data_exch *data_exch) | |
776 | { | |
777 | struct digital_dep_req_res *dep_res; | |
778 | struct sk_buff *skb; | |
779 | int rc; | |
780 | ||
781 | skb = digital_skb_alloc(ddev, 1); | |
782 | if (!skb) | |
783 | return -ENOMEM; | |
784 | ||
785 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
786 | ||
787 | dep_res = (struct digital_dep_req_res *)skb->data; | |
788 | ||
789 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
790 | dep_res->cmd = DIGITAL_CMD_DEP_RES; | |
791 | dep_res->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | | |
792 | ddev->curr_nfc_dep_pni; | |
793 | ||
794 | if (ddev->did) { | |
795 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; | |
796 | ||
797 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, | |
798 | sizeof(ddev->did)); | |
799 | } | |
800 | ||
801 | ddev->curr_nfc_dep_pni = | |
802 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
803 | ||
804 | digital_skb_push_dep_sod(ddev, skb); | |
805 | ||
806 | ddev->skb_add_crc(skb); | |
807 | ||
808 | rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, | |
809 | data_exch); | |
810 | if (rc) | |
811 | kfree_skb(skb); | |
812 | ||
813 | return rc; | |
814 | } | |
815 | ||
1c7a4c24 TE |
816 | static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, |
817 | struct sk_buff *resp) | |
818 | { | |
819 | int rc; | |
820 | struct digital_dep_req_res *dep_req; | |
6ce30668 | 821 | u8 pfb; |
1c7a4c24 TE |
822 | size_t size; |
823 | ||
824 | if (IS_ERR(resp)) { | |
825 | rc = PTR_ERR(resp); | |
826 | resp = NULL; | |
827 | goto exit; | |
828 | } | |
829 | ||
830 | rc = ddev->skb_check_crc(resp); | |
831 | if (rc) { | |
832 | PROTOCOL_ERR("14.4.1.6"); | |
833 | goto exit; | |
834 | } | |
835 | ||
836 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
837 | if (rc) { | |
838 | PROTOCOL_ERR("14.4.1.2"); | |
839 | goto exit; | |
840 | } | |
841 | ||
b08147cb MG |
842 | if (resp->len > ddev->local_payload_max) { |
843 | rc = -EMSGSIZE; | |
844 | goto exit; | |
845 | } | |
846 | ||
1c7a4c24 TE |
847 | size = sizeof(struct digital_dep_req_res); |
848 | dep_req = (struct digital_dep_req_res *)resp->data; | |
849 | ||
850 | if (resp->len < size || dep_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
851 | dep_req->cmd != DIGITAL_CMD_DEP_REQ) { | |
852 | rc = -EIO; | |
853 | goto exit; | |
854 | } | |
855 | ||
6ce30668 MG |
856 | pfb = dep_req->pfb; |
857 | ||
05afedcb MG |
858 | if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { |
859 | if (ddev->did && (ddev->did == resp->data[3])) { | |
860 | size++; | |
861 | } else { | |
862 | rc = -EIO; | |
863 | goto exit; | |
864 | } | |
865 | } else if (ddev->did) { | |
866 | rc = -EIO; | |
867 | goto exit; | |
868 | } | |
1c7a4c24 | 869 | |
3e6b0de8 MG |
870 | if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) { |
871 | rc = -EIO; | |
872 | goto exit; | |
873 | } | |
874 | ||
6ce30668 | 875 | if (size > resp->len) { |
1c7a4c24 TE |
876 | rc = -EIO; |
877 | goto exit; | |
878 | } | |
879 | ||
6ce30668 MG |
880 | skb_pull(resp, size); |
881 | ||
882 | switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { | |
1c7a4c24 | 883 | case DIGITAL_NFC_DEP_PFB_I_PDU: |
26042530 | 884 | pr_debug("DIGITAL_NFC_DEP_PFB_I_PDU\n"); |
485fdc9b MG |
885 | |
886 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { | |
887 | PROTOCOL_ERR("14.12.3.4"); | |
888 | rc = -EIO; | |
889 | goto exit; | |
890 | } | |
891 | ||
c12715ab MG |
892 | resp = digital_recv_dep_data_gather(ddev, pfb, resp, |
893 | digital_tg_send_ack, NULL); | |
894 | if (IS_ERR(resp)) { | |
895 | rc = PTR_ERR(resp); | |
896 | resp = NULL; | |
897 | goto exit; | |
898 | } | |
899 | ||
900 | /* If resp is NULL then we're still chaining so return and | |
901 | * wait for the next part of the PDU. Else, the PDU is | |
902 | * complete so pass it up. | |
903 | */ | |
904 | if (!resp) | |
905 | return; | |
906 | ||
485fdc9b | 907 | rc = 0; |
1c7a4c24 TE |
908 | break; |
909 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: | |
485fdc9b MG |
910 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { |
911 | PROTOCOL_ERR("14.12.3.4"); | |
912 | rc = -EIO; | |
913 | goto exit; | |
914 | } | |
915 | ||
3bd2a5bc MG |
916 | if (ddev->chaining_skb && !DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { |
917 | rc = digital_tg_send_dep_res(ddev, ddev->chaining_skb); | |
918 | if (rc) | |
919 | goto exit; | |
920 | ||
921 | return; | |
922 | } | |
923 | ||
26042530 | 924 | pr_err("Received a ACK/NACK PDU\n"); |
1c7a4c24 TE |
925 | rc = -EINVAL; |
926 | goto exit; | |
1c7a4c24 | 927 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: |
26042530 | 928 | pr_err("Received a SUPERVISOR PDU\n"); |
1c7a4c24 TE |
929 | rc = -EINVAL; |
930 | goto exit; | |
1c7a4c24 TE |
931 | } |
932 | ||
1c7a4c24 TE |
933 | rc = nfc_tm_data_received(ddev->nfc_dev, resp); |
934 | ||
935 | exit: | |
3bd2a5bc MG |
936 | kfree_skb(ddev->chaining_skb); |
937 | ddev->chaining_skb = NULL; | |
938 | ||
1c7a4c24 TE |
939 | if (rc) |
940 | kfree_skb(resp); | |
941 | } | |
942 | ||
943 | int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb) | |
944 | { | |
945 | struct digital_dep_req_res *dep_res; | |
3bd2a5bc MG |
946 | struct sk_buff *chaining_skb, *tmp_skb; |
947 | int rc; | |
1c7a4c24 TE |
948 | |
949 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
b08147cb | 950 | |
1c7a4c24 TE |
951 | dep_res = (struct digital_dep_req_res *)skb->data; |
952 | ||
953 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
954 | dep_res->cmd = DIGITAL_CMD_DEP_RES; | |
955 | dep_res->pfb = ddev->curr_nfc_dep_pni; | |
956 | ||
05afedcb MG |
957 | if (ddev->did) { |
958 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; | |
959 | ||
960 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, | |
961 | sizeof(ddev->did)); | |
962 | } | |
963 | ||
485fdc9b MG |
964 | ddev->curr_nfc_dep_pni = |
965 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
966 | ||
3bd2a5bc | 967 | chaining_skb = ddev->chaining_skb; |
1c7a4c24 | 968 | |
3bd2a5bc MG |
969 | tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_res, NULL); |
970 | if (IS_ERR(tmp_skb)) | |
971 | return PTR_ERR(tmp_skb); | |
972 | ||
973 | digital_skb_push_dep_sod(ddev, tmp_skb); | |
974 | ||
975 | ddev->skb_add_crc(tmp_skb); | |
1c7a4c24 | 976 | |
3bd2a5bc MG |
977 | rc = digital_tg_send_cmd(ddev, tmp_skb, 1500, digital_tg_recv_dep_req, |
978 | NULL); | |
979 | if (rc) { | |
980 | if (tmp_skb != skb) | |
981 | kfree_skb(tmp_skb); | |
982 | ||
983 | kfree_skb(chaining_skb); | |
984 | ddev->chaining_skb = NULL; | |
985 | } | |
986 | ||
987 | return rc; | |
1c7a4c24 TE |
988 | } |
989 | ||
990 | static void digital_tg_send_psl_res_complete(struct nfc_digital_dev *ddev, | |
991 | void *arg, struct sk_buff *resp) | |
992 | { | |
67af1d7a | 993 | u8 rf_tech = (unsigned long)arg; |
1c7a4c24 TE |
994 | |
995 | if (IS_ERR(resp)) | |
996 | return; | |
997 | ||
b711ad52 TE |
998 | digital_tg_set_rf_tech(ddev, rf_tech); |
999 | ||
1c7a4c24 TE |
1000 | digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); |
1001 | ||
1002 | digital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL); | |
1003 | ||
1004 | dev_kfree_skb(resp); | |
1005 | } | |
1006 | ||
1007 | static int digital_tg_send_psl_res(struct nfc_digital_dev *ddev, u8 did, | |
1008 | u8 rf_tech) | |
1009 | { | |
1010 | struct digital_psl_res *psl_res; | |
1011 | struct sk_buff *skb; | |
1012 | int rc; | |
1013 | ||
1014 | skb = digital_skb_alloc(ddev, sizeof(struct digital_psl_res)); | |
1015 | if (!skb) | |
1016 | return -ENOMEM; | |
1017 | ||
1018 | skb_put(skb, sizeof(struct digital_psl_res)); | |
1019 | ||
1020 | psl_res = (struct digital_psl_res *)skb->data; | |
1021 | ||
1022 | psl_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
1023 | psl_res->cmd = DIGITAL_CMD_PSL_RES; | |
1024 | psl_res->did = did; | |
1025 | ||
1026 | digital_skb_push_dep_sod(ddev, skb); | |
1027 | ||
1028 | ddev->skb_add_crc(skb); | |
1029 | ||
485fdc9b MG |
1030 | ddev->curr_nfc_dep_pni = 0; |
1031 | ||
1c7a4c24 | 1032 | rc = digital_tg_send_cmd(ddev, skb, 0, digital_tg_send_psl_res_complete, |
67af1d7a | 1033 | (void *)(unsigned long)rf_tech); |
1c7a4c24 TE |
1034 | if (rc) |
1035 | kfree_skb(skb); | |
1036 | ||
1037 | return rc; | |
1038 | } | |
1039 | ||
1040 | static void digital_tg_recv_psl_req(struct nfc_digital_dev *ddev, void *arg, | |
1041 | struct sk_buff *resp) | |
1042 | { | |
1043 | int rc; | |
1044 | struct digital_psl_req *psl_req; | |
1045 | u8 rf_tech; | |
b08147cb | 1046 | u8 dsi, payload_size, payload_bits; |
1c7a4c24 TE |
1047 | |
1048 | if (IS_ERR(resp)) { | |
1049 | rc = PTR_ERR(resp); | |
1050 | resp = NULL; | |
1051 | goto exit; | |
1052 | } | |
1053 | ||
1054 | rc = ddev->skb_check_crc(resp); | |
1055 | if (rc) { | |
1056 | PROTOCOL_ERR("14.4.1.6"); | |
1057 | goto exit; | |
1058 | } | |
1059 | ||
1060 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
1061 | if (rc) { | |
1062 | PROTOCOL_ERR("14.4.1.2"); | |
1063 | goto exit; | |
1064 | } | |
1065 | ||
1066 | psl_req = (struct digital_psl_req *)resp->data; | |
1067 | ||
1068 | if (resp->len != sizeof(struct digital_psl_req) || | |
1069 | psl_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
1070 | psl_req->cmd != DIGITAL_CMD_PSL_REQ) { | |
1071 | rc = -EIO; | |
1072 | goto exit; | |
1073 | } | |
1074 | ||
1075 | dsi = (psl_req->brs >> 3) & 0x07; | |
1076 | switch (dsi) { | |
1077 | case 0: | |
1078 | rf_tech = NFC_DIGITAL_RF_TECH_106A; | |
1079 | break; | |
1080 | case 1: | |
1081 | rf_tech = NFC_DIGITAL_RF_TECH_212F; | |
1082 | break; | |
1083 | case 2: | |
1084 | rf_tech = NFC_DIGITAL_RF_TECH_424F; | |
1085 | break; | |
1086 | default: | |
77d84ff8 | 1087 | pr_err("Unsupported dsi value %d\n", dsi); |
1c7a4c24 TE |
1088 | goto exit; |
1089 | } | |
1090 | ||
b08147cb MG |
1091 | payload_bits = DIGITAL_PAYLOAD_FSL_TO_BITS(psl_req->fsl); |
1092 | payload_size = digital_payload_bits_to_size(payload_bits); | |
1093 | ||
1094 | if (!payload_size || (payload_size > min(ddev->local_payload_max, | |
1095 | ddev->remote_payload_max))) { | |
1096 | rc = -EINVAL; | |
1097 | goto exit; | |
1098 | } | |
1099 | ||
1100 | ddev->local_payload_max = payload_size; | |
1101 | ddev->remote_payload_max = payload_size; | |
1102 | ||
1c7a4c24 TE |
1103 | rc = digital_tg_send_psl_res(ddev, psl_req->did, rf_tech); |
1104 | ||
1105 | exit: | |
1106 | kfree_skb(resp); | |
1107 | } | |
1108 | ||
1109 | static void digital_tg_send_atr_res_complete(struct nfc_digital_dev *ddev, | |
1110 | void *arg, struct sk_buff *resp) | |
1111 | { | |
1112 | int offset; | |
1113 | ||
1114 | if (IS_ERR(resp)) { | |
1115 | digital_poll_next_tech(ddev); | |
1116 | return; | |
1117 | } | |
1118 | ||
1119 | offset = 2; | |
1120 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) | |
1121 | offset++; | |
1122 | ||
1123 | if (resp->data[offset] == DIGITAL_CMD_PSL_REQ) | |
1124 | digital_tg_recv_psl_req(ddev, arg, resp); | |
1125 | else | |
1126 | digital_tg_recv_dep_req(ddev, arg, resp); | |
1127 | } | |
1128 | ||
1129 | static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev, | |
1130 | struct digital_atr_req *atr_req) | |
1131 | { | |
1132 | struct digital_atr_res *atr_res; | |
1133 | struct sk_buff *skb; | |
b08147cb | 1134 | u8 *gb, payload_bits; |
1c7a4c24 TE |
1135 | size_t gb_len; |
1136 | int rc; | |
1137 | ||
1138 | gb = nfc_get_local_general_bytes(ddev->nfc_dev, &gb_len); | |
1139 | if (!gb) | |
1140 | gb_len = 0; | |
1141 | ||
1142 | skb = digital_skb_alloc(ddev, sizeof(struct digital_atr_res) + gb_len); | |
1143 | if (!skb) | |
1144 | return -ENOMEM; | |
1145 | ||
1146 | skb_put(skb, sizeof(struct digital_atr_res)); | |
1147 | atr_res = (struct digital_atr_res *)skb->data; | |
1148 | ||
1149 | memset(atr_res, 0, sizeof(struct digital_atr_res)); | |
1150 | ||
1151 | atr_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
1152 | atr_res->cmd = DIGITAL_CMD_ATR_RES; | |
1153 | memcpy(atr_res->nfcid3, atr_req->nfcid3, sizeof(atr_req->nfcid3)); | |
1154 | atr_res->to = 8; | |
b08147cb MG |
1155 | |
1156 | ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; | |
1157 | payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); | |
1158 | atr_res->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); | |
1159 | ||
1c7a4c24 TE |
1160 | if (gb_len) { |
1161 | skb_put(skb, gb_len); | |
1162 | ||
1163 | atr_res->pp |= DIGITAL_GB_BIT; | |
1164 | memcpy(atr_res->gb, gb, gb_len); | |
1165 | } | |
1166 | ||
1167 | digital_skb_push_dep_sod(ddev, skb); | |
1168 | ||
1169 | ddev->skb_add_crc(skb); | |
1170 | ||
485fdc9b MG |
1171 | ddev->curr_nfc_dep_pni = 0; |
1172 | ||
1c7a4c24 TE |
1173 | rc = digital_tg_send_cmd(ddev, skb, 999, |
1174 | digital_tg_send_atr_res_complete, NULL); | |
b15829ba | 1175 | if (rc) |
1c7a4c24 | 1176 | kfree_skb(skb); |
1c7a4c24 TE |
1177 | |
1178 | return rc; | |
1179 | } | |
1180 | ||
1181 | void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg, | |
1182 | struct sk_buff *resp) | |
1183 | { | |
1184 | int rc; | |
1185 | struct digital_atr_req *atr_req; | |
1186 | size_t gb_len, min_size; | |
b08147cb | 1187 | u8 poll_tech_count, payload_bits; |
1c7a4c24 TE |
1188 | |
1189 | if (IS_ERR(resp)) { | |
1190 | rc = PTR_ERR(resp); | |
1191 | resp = NULL; | |
1192 | goto exit; | |
1193 | } | |
1194 | ||
1195 | if (!resp->len) { | |
1196 | rc = -EIO; | |
1197 | goto exit; | |
1198 | } | |
1199 | ||
1200 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) { | |
1201 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 2; | |
b711ad52 | 1202 | digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_106A); |
1c7a4c24 TE |
1203 | } else { |
1204 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 1; | |
b711ad52 | 1205 | digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_212F); |
1c7a4c24 TE |
1206 | } |
1207 | ||
1208 | if (resp->len < min_size) { | |
1209 | rc = -EIO; | |
1210 | goto exit; | |
1211 | } | |
1212 | ||
48e10445 | 1213 | ddev->curr_protocol = NFC_PROTO_NFC_DEP_MASK; |
1c7a4c24 TE |
1214 | |
1215 | rc = ddev->skb_check_crc(resp); | |
1216 | if (rc) { | |
1217 | PROTOCOL_ERR("14.4.1.6"); | |
1218 | goto exit; | |
1219 | } | |
1220 | ||
1221 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
1222 | if (rc) { | |
1223 | PROTOCOL_ERR("14.4.1.2"); | |
1224 | goto exit; | |
1225 | } | |
1226 | ||
1227 | atr_req = (struct digital_atr_req *)resp->data; | |
1228 | ||
1229 | if (atr_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
05afedcb MG |
1230 | atr_req->cmd != DIGITAL_CMD_ATR_REQ || |
1231 | atr_req->did > DIGITAL_DID_MAX) { | |
1c7a4c24 TE |
1232 | rc = -EINVAL; |
1233 | goto exit; | |
1234 | } | |
1235 | ||
b08147cb MG |
1236 | payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_req->pp); |
1237 | ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); | |
1238 | ||
1239 | if (!ddev->remote_payload_max) { | |
1240 | rc = -EINVAL; | |
1241 | goto exit; | |
1242 | } | |
1243 | ||
05afedcb MG |
1244 | ddev->did = atr_req->did; |
1245 | ||
1c7a4c24 TE |
1246 | rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, |
1247 | NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED); | |
1248 | if (rc) | |
1249 | goto exit; | |
1250 | ||
1251 | rc = digital_tg_send_atr_res(ddev, atr_req); | |
1252 | if (rc) | |
1253 | goto exit; | |
1254 | ||
1255 | gb_len = resp->len - sizeof(struct digital_atr_req); | |
0529a7ad MG |
1256 | |
1257 | poll_tech_count = ddev->poll_tech_count; | |
1258 | ddev->poll_tech_count = 0; | |
1259 | ||
1c7a4c24 TE |
1260 | rc = nfc_tm_activated(ddev->nfc_dev, NFC_PROTO_NFC_DEP_MASK, |
1261 | NFC_COMM_PASSIVE, atr_req->gb, gb_len); | |
0529a7ad MG |
1262 | if (rc) { |
1263 | ddev->poll_tech_count = poll_tech_count; | |
1c7a4c24 | 1264 | goto exit; |
0529a7ad | 1265 | } |
1c7a4c24 TE |
1266 | |
1267 | rc = 0; | |
1268 | exit: | |
1269 | if (rc) | |
1270 | digital_poll_next_tech(ddev); | |
1271 | ||
1272 | dev_kfree_skb(resp); | |
1273 | } |