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Commit | Line | Data |
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7d0911c0 TE |
1 | /* |
2 | * NFC Digital Protocol stack | |
3 | * Copyright (c) 2013, Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | */ | |
15 | ||
c5da0e4a SO |
16 | #define pr_fmt(fmt) "digital: %s: " fmt, __func__ |
17 | ||
7d0911c0 TE |
18 | #include "digital.h" |
19 | ||
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 | ||
1a09c56f TE |
38 | #define DIGITAL_ATR_RES_TO_WT(s) ((s) & 0xF) |
39 | ||
05afedcb MG |
40 | #define DIGITAL_DID_MAX 14 |
41 | ||
b08147cb MG |
42 | #define DIGITAL_PAYLOAD_SIZE_MAX 254 |
43 | #define DIGITAL_PAYLOAD_BITS_TO_PP(s) (((s) & 0x3) << 4) | |
44 | #define DIGITAL_PAYLOAD_PP_TO_BITS(s) (((s) >> 4) & 0x3) | |
45 | #define DIGITAL_PAYLOAD_BITS_TO_FSL(s) ((s) & 0x3) | |
46 | #define DIGITAL_PAYLOAD_FSL_TO_BITS(s) ((s) & 0x3) | |
47 | ||
7d0911c0 TE |
48 | #define DIGITAL_GB_BIT 0x02 |
49 | ||
3bd2a5bc MG |
50 | #define DIGITAL_NFC_DEP_REQ_RES_HEADROOM 2 /* SoD: [SB (NFC-A)] + LEN */ |
51 | #define DIGITAL_NFC_DEP_REQ_RES_TAILROOM 2 /* EoD: 2-byte CRC */ | |
52 | ||
7d0911c0 TE |
53 | #define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0) |
54 | ||
55 | #define DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT 0x10 | |
3bd2a5bc MG |
56 | #define DIGITAL_NFC_DEP_PFB_MI_BIT 0x10 |
57 | #define DIGITAL_NFC_DEP_PFB_NACK_BIT 0x10 | |
05afedcb | 58 | #define DIGITAL_NFC_DEP_PFB_DID_BIT 0x04 |
7d0911c0 TE |
59 | |
60 | #define DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb) \ | |
61 | ((pfb) & DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT) | |
3bd2a5bc MG |
62 | #define DIGITAL_NFC_DEP_MI_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_MI_BIT) |
63 | #define DIGITAL_NFC_DEP_NACK_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_NACK_BIT) | |
7d0911c0 | 64 | #define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08) |
05afedcb | 65 | #define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_DID_BIT) |
7d0911c0 TE |
66 | #define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03) |
67 | ||
d85a301c TE |
68 | #define DIGITAL_NFC_DEP_RTOX_VALUE(data) ((data) & 0x3F) |
69 | #define DIGITAL_NFC_DEP_RTOX_MAX 59 | |
70 | ||
7d0911c0 TE |
71 | #define DIGITAL_NFC_DEP_PFB_I_PDU 0x00 |
72 | #define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40 | |
73 | #define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80 | |
74 | ||
75 | struct digital_atr_req { | |
76 | u8 dir; | |
77 | u8 cmd; | |
78 | u8 nfcid3[10]; | |
79 | u8 did; | |
80 | u8 bs; | |
81 | u8 br; | |
82 | u8 pp; | |
83 | u8 gb[0]; | |
84 | } __packed; | |
85 | ||
86 | struct digital_atr_res { | |
87 | u8 dir; | |
88 | u8 cmd; | |
89 | u8 nfcid3[10]; | |
90 | u8 did; | |
91 | u8 bs; | |
92 | u8 br; | |
93 | u8 to; | |
94 | u8 pp; | |
95 | u8 gb[0]; | |
96 | } __packed; | |
97 | ||
98 | struct digital_psl_req { | |
99 | u8 dir; | |
100 | u8 cmd; | |
101 | u8 did; | |
102 | u8 brs; | |
103 | u8 fsl; | |
104 | } __packed; | |
105 | ||
106 | struct digital_psl_res { | |
107 | u8 dir; | |
108 | u8 cmd; | |
109 | u8 did; | |
110 | } __packed; | |
111 | ||
112 | struct digital_dep_req_res { | |
113 | u8 dir; | |
114 | u8 cmd; | |
115 | u8 pfb; | |
116 | } __packed; | |
117 | ||
118 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, | |
119 | struct sk_buff *resp); | |
c12715ab MG |
120 | static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, |
121 | struct sk_buff *resp); | |
7d0911c0 | 122 | |
b08147cb MG |
123 | static const u8 digital_payload_bits_map[4] = { |
124 | [0] = 64, | |
125 | [1] = 128, | |
126 | [2] = 192, | |
127 | [3] = 254 | |
128 | }; | |
129 | ||
1a09c56f TE |
130 | /* Response Waiting Time for ATR_RES PDU in ms |
131 | * | |
132 | * RWT(ATR_RES) = RWT(nfcdep,activation) + dRWT(nfcdep) + dT(nfcdep,initiator) | |
133 | * | |
134 | * with: | |
135 | * RWT(nfcdep,activation) = 4096 * 2^12 / f(c) s | |
136 | * dRWT(nfcdep) = 16 / f(c) s | |
137 | * dT(nfcdep,initiator) = 100 ms | |
138 | * f(c) = 13560000 Hz | |
139 | */ | |
140 | #define DIGITAL_ATR_RES_RWT 1337 | |
141 | ||
142 | /* Response Waiting Time for other DEP PDUs in ms | |
143 | * | |
144 | * max_rwt = rwt + dRWT(nfcdep) + dT(nfcdep,initiator) | |
145 | * | |
146 | * with: | |
147 | * rwt = (256 * 16 / f(c)) * 2^wt s | |
148 | * dRWT(nfcdep) = 16 / f(c) s | |
149 | * dT(nfcdep,initiator) = 100 ms | |
150 | * f(c) = 13560000 Hz | |
151 | * 0 <= wt <= 14 (given by the target by the TO field of ATR_RES response) | |
152 | */ | |
153 | #define DIGITAL_NFC_DEP_IN_MAX_WT 14 | |
154 | #define DIGITAL_NFC_DEP_TG_MAX_WT 8 | |
155 | static const u16 digital_rwt_map[DIGITAL_NFC_DEP_IN_MAX_WT + 1] = { | |
156 | 100, 101, 101, 102, 105, | |
157 | 110, 119, 139, 177, 255, | |
158 | 409, 719, 1337, 2575, 5049, | |
159 | }; | |
160 | ||
b08147cb MG |
161 | static u8 digital_payload_bits_to_size(u8 payload_bits) |
162 | { | |
163 | if (payload_bits >= ARRAY_SIZE(digital_payload_bits_map)) | |
164 | return 0; | |
165 | ||
166 | return digital_payload_bits_map[payload_bits]; | |
167 | } | |
168 | ||
169 | static u8 digital_payload_size_to_bits(u8 payload_size) | |
170 | { | |
171 | int i; | |
172 | ||
173 | for (i = 0; i < ARRAY_SIZE(digital_payload_bits_map); i++) | |
174 | if (digital_payload_bits_map[i] == payload_size) | |
175 | return i; | |
176 | ||
177 | return 0xff; | |
178 | } | |
179 | ||
7d0911c0 TE |
180 | static void digital_skb_push_dep_sod(struct nfc_digital_dev *ddev, |
181 | struct sk_buff *skb) | |
182 | { | |
183 | skb_push(skb, sizeof(u8)); | |
184 | ||
185 | skb->data[0] = skb->len; | |
186 | ||
187 | if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) | |
188 | *skb_push(skb, sizeof(u8)) = DIGITAL_NFC_DEP_NFCA_SOD_SB; | |
189 | } | |
190 | ||
191 | static int digital_skb_pull_dep_sod(struct nfc_digital_dev *ddev, | |
192 | struct sk_buff *skb) | |
193 | { | |
194 | u8 size; | |
195 | ||
196 | if (skb->len < 2) | |
197 | return -EIO; | |
198 | ||
199 | if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) | |
200 | skb_pull(skb, sizeof(u8)); | |
201 | ||
202 | size = skb->data[0]; | |
203 | if (size != skb->len) | |
204 | return -EIO; | |
205 | ||
206 | skb_pull(skb, sizeof(u8)); | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
3bd2a5bc MG |
211 | static struct sk_buff * |
212 | digital_send_dep_data_prep(struct nfc_digital_dev *ddev, struct sk_buff *skb, | |
213 | struct digital_dep_req_res *dep_req_res, | |
214 | struct digital_data_exch *data_exch) | |
215 | { | |
216 | struct sk_buff *new_skb; | |
217 | ||
218 | if (skb->len > ddev->remote_payload_max) { | |
219 | dep_req_res->pfb |= DIGITAL_NFC_DEP_PFB_MI_BIT; | |
220 | ||
221 | new_skb = digital_skb_alloc(ddev, ddev->remote_payload_max); | |
222 | if (!new_skb) { | |
223 | kfree_skb(ddev->chaining_skb); | |
224 | ddev->chaining_skb = NULL; | |
225 | ||
226 | return ERR_PTR(-ENOMEM); | |
227 | } | |
228 | ||
3bd2a5bc MG |
229 | memcpy(skb_put(new_skb, ddev->remote_payload_max), skb->data, |
230 | ddev->remote_payload_max); | |
231 | skb_pull(skb, ddev->remote_payload_max); | |
232 | ||
233 | ddev->chaining_skb = skb; | |
234 | ddev->data_exch = data_exch; | |
235 | } else { | |
236 | ddev->chaining_skb = NULL; | |
237 | new_skb = skb; | |
238 | } | |
239 | ||
240 | return new_skb; | |
241 | } | |
242 | ||
c12715ab MG |
243 | static struct sk_buff * |
244 | digital_recv_dep_data_gather(struct nfc_digital_dev *ddev, u8 pfb, | |
245 | struct sk_buff *resp, | |
246 | int (*send_ack)(struct nfc_digital_dev *ddev, | |
247 | struct digital_data_exch | |
248 | *data_exch), | |
249 | struct digital_data_exch *data_exch) | |
250 | { | |
251 | struct sk_buff *new_skb; | |
252 | int rc; | |
253 | ||
254 | if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb) && (!ddev->chaining_skb)) { | |
255 | ddev->chaining_skb = | |
256 | nfc_alloc_recv_skb(8 * ddev->local_payload_max, | |
257 | GFP_KERNEL); | |
258 | if (!ddev->chaining_skb) { | |
259 | rc = -ENOMEM; | |
260 | goto error; | |
261 | } | |
262 | } | |
263 | ||
264 | if (ddev->chaining_skb) { | |
265 | if (resp->len > skb_tailroom(ddev->chaining_skb)) { | |
266 | new_skb = skb_copy_expand(ddev->chaining_skb, | |
267 | skb_headroom( | |
268 | ddev->chaining_skb), | |
269 | 8 * ddev->local_payload_max, | |
270 | GFP_KERNEL); | |
271 | if (!new_skb) { | |
272 | rc = -ENOMEM; | |
273 | goto error; | |
274 | } | |
275 | ||
276 | kfree_skb(ddev->chaining_skb); | |
277 | ddev->chaining_skb = new_skb; | |
278 | } | |
279 | ||
280 | memcpy(skb_put(ddev->chaining_skb, resp->len), resp->data, | |
281 | resp->len); | |
282 | ||
283 | kfree_skb(resp); | |
284 | resp = NULL; | |
285 | ||
286 | if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb)) { | |
287 | rc = send_ack(ddev, data_exch); | |
288 | if (rc) | |
289 | goto error; | |
290 | ||
291 | return NULL; | |
292 | } | |
293 | ||
294 | resp = ddev->chaining_skb; | |
295 | ddev->chaining_skb = NULL; | |
296 | } | |
297 | ||
298 | return resp; | |
299 | ||
300 | error: | |
301 | kfree_skb(resp); | |
302 | ||
303 | kfree_skb(ddev->chaining_skb); | |
304 | ddev->chaining_skb = NULL; | |
305 | ||
306 | return ERR_PTR(rc); | |
307 | } | |
308 | ||
dddb3da0 MG |
309 | static void digital_in_recv_psl_res(struct nfc_digital_dev *ddev, void *arg, |
310 | struct sk_buff *resp) | |
311 | { | |
312 | struct nfc_target *target = arg; | |
313 | struct digital_psl_res *psl_res; | |
314 | int rc; | |
315 | ||
316 | if (IS_ERR(resp)) { | |
317 | rc = PTR_ERR(resp); | |
318 | resp = NULL; | |
319 | goto exit; | |
320 | } | |
321 | ||
322 | rc = ddev->skb_check_crc(resp); | |
323 | if (rc) { | |
324 | PROTOCOL_ERR("14.4.1.6"); | |
325 | goto exit; | |
326 | } | |
327 | ||
328 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
329 | if (rc) { | |
330 | PROTOCOL_ERR("14.4.1.2"); | |
331 | goto exit; | |
332 | } | |
333 | ||
334 | psl_res = (struct digital_psl_res *)resp->data; | |
335 | ||
336 | if ((resp->len != sizeof(*psl_res)) || | |
337 | (psl_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN) || | |
338 | (psl_res->cmd != DIGITAL_CMD_PSL_RES)) { | |
339 | rc = -EIO; | |
340 | goto exit; | |
341 | } | |
342 | ||
343 | rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, | |
344 | NFC_DIGITAL_RF_TECH_424F); | |
345 | if (rc) | |
346 | goto exit; | |
347 | ||
348 | rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, | |
349 | NFC_DIGITAL_FRAMING_NFCF_NFC_DEP); | |
350 | if (rc) | |
351 | goto exit; | |
352 | ||
353 | if (!DIGITAL_DRV_CAPS_IN_CRC(ddev) && | |
354 | (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)) { | |
355 | ddev->skb_add_crc = digital_skb_add_crc_f; | |
356 | ddev->skb_check_crc = digital_skb_check_crc_f; | |
357 | } | |
358 | ||
359 | ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_424F; | |
360 | ||
361 | nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, | |
362 | NFC_RF_INITIATOR); | |
363 | ||
364 | ddev->curr_nfc_dep_pni = 0; | |
365 | ||
366 | exit: | |
367 | dev_kfree_skb(resp); | |
368 | ||
369 | if (rc) | |
370 | ddev->curr_protocol = 0; | |
371 | } | |
372 | ||
373 | static int digital_in_send_psl_req(struct nfc_digital_dev *ddev, | |
374 | struct nfc_target *target) | |
375 | { | |
376 | struct sk_buff *skb; | |
377 | struct digital_psl_req *psl_req; | |
b15829ba | 378 | int rc; |
b08147cb | 379 | u8 payload_size, payload_bits; |
dddb3da0 MG |
380 | |
381 | skb = digital_skb_alloc(ddev, sizeof(*psl_req)); | |
382 | if (!skb) | |
383 | return -ENOMEM; | |
384 | ||
385 | skb_put(skb, sizeof(*psl_req)); | |
386 | ||
387 | psl_req = (struct digital_psl_req *)skb->data; | |
388 | ||
389 | psl_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
390 | psl_req->cmd = DIGITAL_CMD_PSL_REQ; | |
391 | psl_req->did = 0; | |
392 | psl_req->brs = (0x2 << 3) | 0x2; /* 424F both directions */ | |
b08147cb MG |
393 | |
394 | payload_size = min(ddev->local_payload_max, ddev->remote_payload_max); | |
395 | payload_bits = digital_payload_size_to_bits(payload_size); | |
396 | psl_req->fsl = DIGITAL_PAYLOAD_BITS_TO_FSL(payload_bits); | |
397 | ||
398 | ddev->local_payload_max = payload_size; | |
399 | ddev->remote_payload_max = payload_size; | |
dddb3da0 MG |
400 | |
401 | digital_skb_push_dep_sod(ddev, skb); | |
402 | ||
403 | ddev->skb_add_crc(skb); | |
404 | ||
1a09c56f TE |
405 | rc = digital_in_send_cmd(ddev, skb, ddev->dep_rwt, |
406 | digital_in_recv_psl_res, target); | |
b15829ba MG |
407 | if (rc) |
408 | kfree_skb(skb); | |
409 | ||
410 | return rc; | |
dddb3da0 MG |
411 | } |
412 | ||
7d0911c0 TE |
413 | static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg, |
414 | struct sk_buff *resp) | |
415 | { | |
416 | struct nfc_target *target = arg; | |
417 | struct digital_atr_res *atr_res; | |
b08147cb | 418 | u8 gb_len, payload_bits; |
1a09c56f | 419 | u8 wt; |
7d0911c0 TE |
420 | int rc; |
421 | ||
422 | if (IS_ERR(resp)) { | |
423 | rc = PTR_ERR(resp); | |
424 | resp = NULL; | |
425 | goto exit; | |
426 | } | |
427 | ||
428 | rc = ddev->skb_check_crc(resp); | |
429 | if (rc) { | |
430 | PROTOCOL_ERR("14.4.1.6"); | |
431 | goto exit; | |
432 | } | |
433 | ||
434 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
435 | if (rc) { | |
436 | PROTOCOL_ERR("14.4.1.2"); | |
437 | goto exit; | |
438 | } | |
439 | ||
440 | if (resp->len < sizeof(struct digital_atr_res)) { | |
441 | rc = -EIO; | |
442 | goto exit; | |
443 | } | |
444 | ||
445 | gb_len = resp->len - sizeof(struct digital_atr_res); | |
446 | ||
447 | atr_res = (struct digital_atr_res *)resp->data; | |
448 | ||
1a09c56f TE |
449 | wt = DIGITAL_ATR_RES_TO_WT(atr_res->to); |
450 | if (wt > DIGITAL_NFC_DEP_IN_MAX_WT) | |
451 | wt = DIGITAL_NFC_DEP_IN_MAX_WT; | |
452 | ddev->dep_rwt = digital_rwt_map[wt]; | |
453 | ||
b08147cb MG |
454 | payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_res->pp); |
455 | ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); | |
456 | ||
457 | if (!ddev->remote_payload_max) { | |
458 | rc = -EINVAL; | |
459 | goto exit; | |
460 | } | |
461 | ||
7d0911c0 TE |
462 | rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len); |
463 | if (rc) | |
464 | goto exit; | |
465 | ||
dddb3da0 MG |
466 | if ((ddev->protocols & NFC_PROTO_FELICA_MASK) && |
467 | (ddev->curr_rf_tech != NFC_DIGITAL_RF_TECH_424F)) { | |
468 | rc = digital_in_send_psl_req(ddev, target); | |
469 | if (!rc) | |
470 | goto exit; | |
471 | } | |
472 | ||
7d0911c0 TE |
473 | rc = nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, |
474 | NFC_RF_INITIATOR); | |
475 | ||
476 | ddev->curr_nfc_dep_pni = 0; | |
477 | ||
478 | exit: | |
479 | dev_kfree_skb(resp); | |
480 | ||
481 | if (rc) | |
482 | ddev->curr_protocol = 0; | |
483 | } | |
484 | ||
485 | int digital_in_send_atr_req(struct nfc_digital_dev *ddev, | |
486 | struct nfc_target *target, __u8 comm_mode, __u8 *gb, | |
487 | size_t gb_len) | |
488 | { | |
489 | struct sk_buff *skb; | |
490 | struct digital_atr_req *atr_req; | |
491 | uint size; | |
b15829ba | 492 | int rc; |
b08147cb | 493 | u8 payload_bits; |
7d0911c0 TE |
494 | |
495 | size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len; | |
496 | ||
497 | if (size > DIGITAL_ATR_REQ_MAX_SIZE) { | |
498 | PROTOCOL_ERR("14.6.1.1"); | |
499 | return -EINVAL; | |
500 | } | |
501 | ||
502 | skb = digital_skb_alloc(ddev, size); | |
503 | if (!skb) | |
504 | return -ENOMEM; | |
505 | ||
506 | skb_put(skb, sizeof(struct digital_atr_req)); | |
507 | ||
508 | atr_req = (struct digital_atr_req *)skb->data; | |
509 | memset(atr_req, 0, sizeof(struct digital_atr_req)); | |
510 | ||
511 | atr_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
512 | atr_req->cmd = DIGITAL_CMD_ATR_REQ; | |
513 | if (target->nfcid2_len) | |
4f319e32 | 514 | memcpy(atr_req->nfcid3, target->nfcid2, NFC_NFCID2_MAXSIZE); |
7d0911c0 | 515 | else |
4f319e32 | 516 | get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE); |
7d0911c0 TE |
517 | |
518 | atr_req->did = 0; | |
519 | atr_req->bs = 0; | |
520 | atr_req->br = 0; | |
521 | ||
b08147cb MG |
522 | ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; |
523 | payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); | |
524 | atr_req->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); | |
7d0911c0 TE |
525 | |
526 | if (gb_len) { | |
527 | atr_req->pp |= DIGITAL_GB_BIT; | |
528 | memcpy(skb_put(skb, gb_len), gb, gb_len); | |
529 | } | |
530 | ||
531 | digital_skb_push_dep_sod(ddev, skb); | |
532 | ||
533 | ddev->skb_add_crc(skb); | |
534 | ||
1a09c56f TE |
535 | rc = digital_in_send_cmd(ddev, skb, DIGITAL_ATR_RES_RWT, |
536 | digital_in_recv_atr_res, target); | |
b15829ba MG |
537 | if (rc) |
538 | kfree_skb(skb); | |
539 | ||
540 | return rc; | |
7d0911c0 TE |
541 | } |
542 | ||
c12715ab MG |
543 | static int digital_in_send_ack(struct nfc_digital_dev *ddev, |
544 | struct digital_data_exch *data_exch) | |
545 | { | |
546 | struct digital_dep_req_res *dep_req; | |
547 | struct sk_buff *skb; | |
548 | int rc; | |
549 | ||
550 | skb = digital_skb_alloc(ddev, 1); | |
551 | if (!skb) | |
552 | return -ENOMEM; | |
553 | ||
554 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
555 | ||
556 | dep_req = (struct digital_dep_req_res *)skb->data; | |
557 | ||
558 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
559 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
560 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | | |
561 | ddev->curr_nfc_dep_pni; | |
562 | ||
563 | digital_skb_push_dep_sod(ddev, skb); | |
564 | ||
565 | ddev->skb_add_crc(skb); | |
566 | ||
1d984c2e | 567 | ddev->saved_skb = pskb_copy(skb, GFP_KERNEL); |
384ab1d1 | 568 | |
1a09c56f TE |
569 | rc = digital_in_send_cmd(ddev, skb, ddev->dep_rwt, |
570 | digital_in_recv_dep_res, data_exch); | |
384ab1d1 | 571 | if (rc) { |
c12715ab | 572 | kfree_skb(skb); |
384ab1d1 MG |
573 | kfree_skb(ddev->saved_skb); |
574 | ddev->saved_skb = NULL; | |
575 | } | |
c12715ab MG |
576 | |
577 | return rc; | |
578 | } | |
579 | ||
a80509c7 MG |
580 | static int digital_in_send_nack(struct nfc_digital_dev *ddev, |
581 | struct digital_data_exch *data_exch) | |
582 | { | |
583 | struct digital_dep_req_res *dep_req; | |
584 | struct sk_buff *skb; | |
585 | int rc; | |
586 | ||
587 | skb = digital_skb_alloc(ddev, 1); | |
588 | if (!skb) | |
589 | return -ENOMEM; | |
590 | ||
591 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
592 | ||
593 | dep_req = (struct digital_dep_req_res *)skb->data; | |
594 | ||
595 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
596 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
597 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | | |
598 | DIGITAL_NFC_DEP_PFB_NACK_BIT | ddev->curr_nfc_dep_pni; | |
599 | ||
600 | digital_skb_push_dep_sod(ddev, skb); | |
601 | ||
602 | ddev->skb_add_crc(skb); | |
603 | ||
1a09c56f TE |
604 | rc = digital_in_send_cmd(ddev, skb, ddev->dep_rwt, |
605 | digital_in_recv_dep_res, data_exch); | |
a80509c7 MG |
606 | if (rc) |
607 | kfree_skb(skb); | |
608 | ||
609 | return rc; | |
610 | } | |
611 | ||
384ab1d1 MG |
612 | static int digital_in_send_atn(struct nfc_digital_dev *ddev, |
613 | struct digital_data_exch *data_exch) | |
614 | { | |
615 | struct digital_dep_req_res *dep_req; | |
616 | struct sk_buff *skb; | |
617 | int rc; | |
618 | ||
619 | skb = digital_skb_alloc(ddev, 1); | |
620 | if (!skb) | |
621 | return -ENOMEM; | |
622 | ||
623 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
624 | ||
625 | dep_req = (struct digital_dep_req_res *)skb->data; | |
626 | ||
627 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
628 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
629 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU; | |
630 | ||
631 | digital_skb_push_dep_sod(ddev, skb); | |
632 | ||
633 | ddev->skb_add_crc(skb); | |
634 | ||
1a09c56f TE |
635 | rc = digital_in_send_cmd(ddev, skb, ddev->dep_rwt, |
636 | digital_in_recv_dep_res, data_exch); | |
384ab1d1 MG |
637 | if (rc) |
638 | kfree_skb(skb); | |
639 | ||
640 | return rc; | |
641 | } | |
642 | ||
7d0911c0 TE |
643 | static int digital_in_send_rtox(struct nfc_digital_dev *ddev, |
644 | struct digital_data_exch *data_exch, u8 rtox) | |
645 | { | |
646 | struct digital_dep_req_res *dep_req; | |
647 | struct sk_buff *skb; | |
648 | int rc; | |
d85a301c TE |
649 | u16 rwt_int; |
650 | ||
651 | rwt_int = ddev->dep_rwt * rtox; | |
652 | if (rwt_int > digital_rwt_map[DIGITAL_NFC_DEP_IN_MAX_WT]) | |
653 | rwt_int = digital_rwt_map[DIGITAL_NFC_DEP_IN_MAX_WT]; | |
7d0911c0 TE |
654 | |
655 | skb = digital_skb_alloc(ddev, 1); | |
656 | if (!skb) | |
657 | return -ENOMEM; | |
658 | ||
659 | *skb_put(skb, 1) = rtox; | |
660 | ||
661 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
662 | ||
663 | dep_req = (struct digital_dep_req_res *)skb->data; | |
664 | ||
665 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; | |
666 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
667 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU | | |
668 | DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT; | |
669 | ||
670 | digital_skb_push_dep_sod(ddev, skb); | |
671 | ||
672 | ddev->skb_add_crc(skb); | |
673 | ||
d85a301c | 674 | rc = digital_in_send_cmd(ddev, skb, rwt_int, |
1a09c56f | 675 | digital_in_recv_dep_res, data_exch); |
1d984c2e | 676 | if (rc) |
b15829ba | 677 | kfree_skb(skb); |
7d0911c0 TE |
678 | |
679 | return rc; | |
680 | } | |
681 | ||
384ab1d1 MG |
682 | static int digital_in_send_saved_skb(struct nfc_digital_dev *ddev, |
683 | struct digital_data_exch *data_exch) | |
684 | { | |
1d984c2e TE |
685 | int rc; |
686 | ||
687 | if (!ddev->saved_skb) | |
688 | return -EINVAL; | |
689 | ||
384ab1d1 | 690 | skb_get(ddev->saved_skb); |
384ab1d1 | 691 | |
1a09c56f | 692 | rc = digital_in_send_cmd(ddev, ddev->saved_skb, ddev->dep_rwt, |
1d984c2e TE |
693 | digital_in_recv_dep_res, data_exch); |
694 | if (rc) | |
695 | kfree_skb(ddev->saved_skb); | |
696 | ||
697 | return rc; | |
384ab1d1 MG |
698 | } |
699 | ||
7d0911c0 TE |
700 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, |
701 | struct sk_buff *resp) | |
702 | { | |
703 | struct digital_data_exch *data_exch = arg; | |
704 | struct digital_dep_req_res *dep_res; | |
705 | u8 pfb; | |
706 | uint size; | |
707 | int rc; | |
d85a301c | 708 | u8 rtox; |
7d0911c0 TE |
709 | |
710 | if (IS_ERR(resp)) { | |
711 | rc = PTR_ERR(resp); | |
712 | resp = NULL; | |
a80509c7 | 713 | |
3f89fea3 | 714 | if ((rc == -EIO || (rc == -ETIMEDOUT && ddev->nack_count)) && |
a80509c7 | 715 | (ddev->nack_count++ < DIGITAL_NFC_DEP_N_RETRY_NACK)) { |
384ab1d1 MG |
716 | ddev->atn_count = 0; |
717 | ||
a80509c7 MG |
718 | rc = digital_in_send_nack(ddev, data_exch); |
719 | if (rc) | |
720 | goto error; | |
721 | ||
384ab1d1 MG |
722 | return; |
723 | } else if ((rc == -ETIMEDOUT) && | |
724 | (ddev->atn_count++ < DIGITAL_NFC_DEP_N_RETRY_ATN)) { | |
725 | ddev->nack_count = 0; | |
726 | ||
727 | rc = digital_in_send_atn(ddev, data_exch); | |
728 | if (rc) | |
729 | goto error; | |
730 | ||
a80509c7 MG |
731 | return; |
732 | } | |
733 | ||
734 | goto exit; | |
735 | } | |
736 | ||
737 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
738 | if (rc) { | |
739 | PROTOCOL_ERR("14.4.1.2"); | |
7d0911c0 TE |
740 | goto exit; |
741 | } | |
742 | ||
743 | rc = ddev->skb_check_crc(resp); | |
744 | if (rc) { | |
a80509c7 MG |
745 | if ((resp->len >= 4) && |
746 | (ddev->nack_count++ < DIGITAL_NFC_DEP_N_RETRY_NACK)) { | |
384ab1d1 MG |
747 | ddev->atn_count = 0; |
748 | ||
a80509c7 MG |
749 | rc = digital_in_send_nack(ddev, data_exch); |
750 | if (rc) | |
751 | goto error; | |
752 | ||
753 | kfree_skb(resp); | |
754 | ||
755 | return; | |
756 | } | |
757 | ||
7d0911c0 TE |
758 | PROTOCOL_ERR("14.4.1.6"); |
759 | goto error; | |
760 | } | |
761 | ||
384ab1d1 | 762 | ddev->atn_count = 0; |
a80509c7 | 763 | ddev->nack_count = 0; |
7d0911c0 | 764 | |
b08147cb MG |
765 | if (resp->len > ddev->local_payload_max) { |
766 | rc = -EMSGSIZE; | |
767 | goto exit; | |
768 | } | |
769 | ||
6ce30668 | 770 | size = sizeof(struct digital_dep_req_res); |
7d0911c0 TE |
771 | dep_res = (struct digital_dep_req_res *)resp->data; |
772 | ||
6ce30668 | 773 | if (resp->len < size || dep_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN || |
7d0911c0 TE |
774 | dep_res->cmd != DIGITAL_CMD_DEP_RES) { |
775 | rc = -EIO; | |
776 | goto error; | |
777 | } | |
778 | ||
779 | pfb = dep_res->pfb; | |
780 | ||
3bc3f88a MG |
781 | if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { |
782 | PROTOCOL_ERR("14.8.2.1"); | |
783 | rc = -EIO; | |
784 | goto error; | |
785 | } | |
6ce30668 | 786 | |
3e6b0de8 MG |
787 | if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) { |
788 | rc = -EIO; | |
789 | goto exit; | |
790 | } | |
791 | ||
6ce30668 MG |
792 | if (size > resp->len) { |
793 | rc = -EIO; | |
794 | goto error; | |
795 | } | |
796 | ||
797 | skb_pull(resp, size); | |
798 | ||
7d0911c0 TE |
799 | switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { |
800 | case DIGITAL_NFC_DEP_PFB_I_PDU: | |
801 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { | |
802 | PROTOCOL_ERR("14.12.3.3"); | |
803 | rc = -EIO; | |
804 | goto error; | |
805 | } | |
806 | ||
807 | ddev->curr_nfc_dep_pni = | |
808 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
c12715ab | 809 | |
384ab1d1 MG |
810 | kfree_skb(ddev->saved_skb); |
811 | ddev->saved_skb = NULL; | |
812 | ||
c12715ab MG |
813 | resp = digital_recv_dep_data_gather(ddev, pfb, resp, |
814 | digital_in_send_ack, | |
815 | data_exch); | |
816 | if (IS_ERR(resp)) { | |
817 | rc = PTR_ERR(resp); | |
818 | resp = NULL; | |
819 | goto error; | |
820 | } | |
821 | ||
822 | /* If resp is NULL then we're still chaining so return and | |
823 | * wait for the next part of the PDU. Else, the PDU is | |
824 | * complete so pass it up. | |
825 | */ | |
826 | if (!resp) | |
827 | return; | |
828 | ||
7d0911c0 TE |
829 | rc = 0; |
830 | break; | |
831 | ||
832 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: | |
e073eb67 TE |
833 | if (DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { |
834 | PROTOCOL_ERR("14.12.4.5"); | |
835 | rc = -EIO; | |
836 | goto exit; | |
837 | } | |
838 | ||
485fdc9b MG |
839 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { |
840 | PROTOCOL_ERR("14.12.3.3"); | |
841 | rc = -EIO; | |
842 | goto exit; | |
843 | } | |
844 | ||
845 | ddev->curr_nfc_dep_pni = | |
846 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
847 | ||
e073eb67 TE |
848 | if (!ddev->chaining_skb) { |
849 | PROTOCOL_ERR("14.12.4.3"); | |
850 | rc = -EIO; | |
851 | goto exit; | |
852 | } | |
384ab1d1 | 853 | |
e073eb67 TE |
854 | /* The initiator has received a valid ACK. Free the last sent |
855 | * PDU and keep on sending chained skb. | |
856 | */ | |
857 | kfree_skb(ddev->saved_skb); | |
858 | ddev->saved_skb = NULL; | |
3bd2a5bc | 859 | |
e073eb67 TE |
860 | rc = digital_in_send_dep_req(ddev, NULL, |
861 | ddev->chaining_skb, | |
862 | ddev->data_exch); | |
863 | if (rc) | |
864 | goto error; | |
3bd2a5bc | 865 | |
e073eb67 | 866 | goto free_resp; |
7d0911c0 TE |
867 | |
868 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: | |
384ab1d1 MG |
869 | if (!DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { /* ATN */ |
870 | rc = digital_in_send_saved_skb(ddev, data_exch); | |
1d984c2e | 871 | if (rc) |
384ab1d1 | 872 | goto error; |
384ab1d1 | 873 | |
e200f008 | 874 | goto free_resp; |
7d0911c0 TE |
875 | } |
876 | ||
d85a301c TE |
877 | if (ddev->atn_count || ddev->nack_count) { |
878 | PROTOCOL_ERR("14.12.4.4"); | |
879 | rc = -EIO; | |
880 | goto error; | |
881 | } | |
882 | ||
883 | rtox = DIGITAL_NFC_DEP_RTOX_VALUE(resp->data[0]); | |
884 | if (!rtox || rtox > DIGITAL_NFC_DEP_RTOX_MAX) { | |
885 | PROTOCOL_ERR("14.8.4.1"); | |
886 | rc = -EIO; | |
887 | goto error; | |
888 | } | |
889 | ||
890 | rc = digital_in_send_rtox(ddev, data_exch, rtox); | |
7d0911c0 TE |
891 | if (rc) |
892 | goto error; | |
893 | ||
e200f008 | 894 | goto free_resp; |
7d0911c0 TE |
895 | } |
896 | ||
7d0911c0 TE |
897 | exit: |
898 | data_exch->cb(data_exch->cb_context, resp, rc); | |
899 | ||
900 | error: | |
901 | kfree(data_exch); | |
902 | ||
3bd2a5bc MG |
903 | kfree_skb(ddev->chaining_skb); |
904 | ddev->chaining_skb = NULL; | |
905 | ||
384ab1d1 MG |
906 | kfree_skb(ddev->saved_skb); |
907 | ddev->saved_skb = NULL; | |
908 | ||
7d0911c0 TE |
909 | if (rc) |
910 | kfree_skb(resp); | |
e073eb67 TE |
911 | |
912 | return; | |
913 | ||
914 | free_resp: | |
915 | dev_kfree_skb(resp); | |
7d0911c0 TE |
916 | } |
917 | ||
918 | int digital_in_send_dep_req(struct nfc_digital_dev *ddev, | |
919 | struct nfc_target *target, struct sk_buff *skb, | |
920 | struct digital_data_exch *data_exch) | |
921 | { | |
922 | struct digital_dep_req_res *dep_req; | |
3bd2a5bc MG |
923 | struct sk_buff *chaining_skb, *tmp_skb; |
924 | int rc; | |
7d0911c0 TE |
925 | |
926 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
927 | ||
928 | dep_req = (struct digital_dep_req_res *)skb->data; | |
3bd2a5bc | 929 | |
7d0911c0 TE |
930 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
931 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; | |
932 | dep_req->pfb = ddev->curr_nfc_dep_pni; | |
933 | ||
384ab1d1 | 934 | ddev->atn_count = 0; |
a80509c7 MG |
935 | ddev->nack_count = 0; |
936 | ||
3bd2a5bc | 937 | chaining_skb = ddev->chaining_skb; |
7d0911c0 | 938 | |
3bd2a5bc MG |
939 | tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_req, data_exch); |
940 | if (IS_ERR(tmp_skb)) | |
941 | return PTR_ERR(tmp_skb); | |
7d0911c0 | 942 | |
3bd2a5bc MG |
943 | digital_skb_push_dep_sod(ddev, tmp_skb); |
944 | ||
945 | ddev->skb_add_crc(tmp_skb); | |
946 | ||
1d984c2e | 947 | ddev->saved_skb = pskb_copy(tmp_skb, GFP_KERNEL); |
384ab1d1 | 948 | |
1a09c56f TE |
949 | rc = digital_in_send_cmd(ddev, tmp_skb, ddev->dep_rwt, |
950 | digital_in_recv_dep_res, data_exch); | |
3bd2a5bc MG |
951 | if (rc) { |
952 | if (tmp_skb != skb) | |
953 | kfree_skb(tmp_skb); | |
954 | ||
955 | kfree_skb(chaining_skb); | |
956 | ddev->chaining_skb = NULL; | |
384ab1d1 MG |
957 | |
958 | kfree_skb(ddev->saved_skb); | |
959 | ddev->saved_skb = NULL; | |
3bd2a5bc MG |
960 | } |
961 | ||
962 | return rc; | |
7d0911c0 | 963 | } |
1c7a4c24 | 964 | |
b711ad52 TE |
965 | static void digital_tg_set_rf_tech(struct nfc_digital_dev *ddev, u8 rf_tech) |
966 | { | |
967 | ddev->curr_rf_tech = rf_tech; | |
968 | ||
969 | ddev->skb_add_crc = digital_skb_add_crc_none; | |
970 | ddev->skb_check_crc = digital_skb_check_crc_none; | |
971 | ||
972 | if (DIGITAL_DRV_CAPS_TG_CRC(ddev)) | |
973 | return; | |
974 | ||
975 | switch (ddev->curr_rf_tech) { | |
976 | case NFC_DIGITAL_RF_TECH_106A: | |
977 | ddev->skb_add_crc = digital_skb_add_crc_a; | |
978 | ddev->skb_check_crc = digital_skb_check_crc_a; | |
979 | break; | |
980 | ||
981 | case NFC_DIGITAL_RF_TECH_212F: | |
982 | case NFC_DIGITAL_RF_TECH_424F: | |
983 | ddev->skb_add_crc = digital_skb_add_crc_f; | |
984 | ddev->skb_check_crc = digital_skb_check_crc_f; | |
985 | break; | |
986 | ||
987 | default: | |
988 | break; | |
989 | } | |
990 | } | |
991 | ||
c12715ab MG |
992 | static int digital_tg_send_ack(struct nfc_digital_dev *ddev, |
993 | struct digital_data_exch *data_exch) | |
994 | { | |
995 | struct digital_dep_req_res *dep_res; | |
996 | struct sk_buff *skb; | |
997 | int rc; | |
998 | ||
999 | skb = digital_skb_alloc(ddev, 1); | |
1000 | if (!skb) | |
1001 | return -ENOMEM; | |
1002 | ||
1003 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
1004 | ||
1005 | dep_res = (struct digital_dep_req_res *)skb->data; | |
1006 | ||
1007 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
1008 | dep_res->cmd = DIGITAL_CMD_DEP_RES; | |
1009 | dep_res->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | | |
1010 | ddev->curr_nfc_dep_pni; | |
1011 | ||
1012 | if (ddev->did) { | |
1013 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; | |
1014 | ||
1015 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, | |
1016 | sizeof(ddev->did)); | |
1017 | } | |
1018 | ||
1019 | ddev->curr_nfc_dep_pni = | |
1020 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
1021 | ||
1022 | digital_skb_push_dep_sod(ddev, skb); | |
1023 | ||
1024 | ddev->skb_add_crc(skb); | |
1025 | ||
1d984c2e | 1026 | ddev->saved_skb = pskb_copy(skb, GFP_KERNEL); |
49dbb14e | 1027 | |
c12715ab MG |
1028 | rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, |
1029 | data_exch); | |
49dbb14e | 1030 | if (rc) { |
c12715ab | 1031 | kfree_skb(skb); |
49dbb14e MG |
1032 | kfree_skb(ddev->saved_skb); |
1033 | ddev->saved_skb = NULL; | |
1034 | } | |
c12715ab MG |
1035 | |
1036 | return rc; | |
1037 | } | |
1038 | ||
9b5ec0fd MG |
1039 | static int digital_tg_send_atn(struct nfc_digital_dev *ddev) |
1040 | { | |
1041 | struct digital_dep_req_res *dep_res; | |
1042 | struct sk_buff *skb; | |
1043 | int rc; | |
1044 | ||
1045 | skb = digital_skb_alloc(ddev, 1); | |
1046 | if (!skb) | |
1047 | return -ENOMEM; | |
1048 | ||
1049 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
1050 | ||
1051 | dep_res = (struct digital_dep_req_res *)skb->data; | |
1052 | ||
1053 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
1054 | dep_res->cmd = DIGITAL_CMD_DEP_RES; | |
1055 | dep_res->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU; | |
1056 | ||
1057 | if (ddev->did) { | |
1058 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; | |
1059 | ||
1060 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, | |
1061 | sizeof(ddev->did)); | |
1062 | } | |
1063 | ||
1064 | digital_skb_push_dep_sod(ddev, skb); | |
1065 | ||
1066 | ddev->skb_add_crc(skb); | |
1067 | ||
1068 | rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, | |
1069 | NULL); | |
1070 | if (rc) | |
1071 | kfree_skb(skb); | |
1072 | ||
1073 | return rc; | |
1074 | } | |
1075 | ||
49dbb14e MG |
1076 | static int digital_tg_send_saved_skb(struct nfc_digital_dev *ddev) |
1077 | { | |
1d984c2e TE |
1078 | int rc; |
1079 | ||
1080 | if (!ddev->saved_skb) | |
1081 | return -EINVAL; | |
1082 | ||
49dbb14e | 1083 | skb_get(ddev->saved_skb); |
49dbb14e | 1084 | |
1d984c2e TE |
1085 | rc = digital_tg_send_cmd(ddev, ddev->saved_skb, 1500, |
1086 | digital_tg_recv_dep_req, NULL); | |
1087 | if (rc) | |
1088 | kfree_skb(ddev->saved_skb); | |
1089 | ||
1090 | return rc; | |
49dbb14e MG |
1091 | } |
1092 | ||
1c7a4c24 TE |
1093 | static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, |
1094 | struct sk_buff *resp) | |
1095 | { | |
1096 | int rc; | |
1097 | struct digital_dep_req_res *dep_req; | |
6ce30668 | 1098 | u8 pfb; |
1c7a4c24 TE |
1099 | size_t size; |
1100 | ||
1101 | if (IS_ERR(resp)) { | |
1102 | rc = PTR_ERR(resp); | |
1103 | resp = NULL; | |
1104 | goto exit; | |
1105 | } | |
1106 | ||
1107 | rc = ddev->skb_check_crc(resp); | |
1108 | if (rc) { | |
1109 | PROTOCOL_ERR("14.4.1.6"); | |
1110 | goto exit; | |
1111 | } | |
1112 | ||
1113 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
1114 | if (rc) { | |
1115 | PROTOCOL_ERR("14.4.1.2"); | |
1116 | goto exit; | |
1117 | } | |
1118 | ||
b08147cb MG |
1119 | if (resp->len > ddev->local_payload_max) { |
1120 | rc = -EMSGSIZE; | |
1121 | goto exit; | |
1122 | } | |
1123 | ||
1c7a4c24 TE |
1124 | size = sizeof(struct digital_dep_req_res); |
1125 | dep_req = (struct digital_dep_req_res *)resp->data; | |
1126 | ||
1127 | if (resp->len < size || dep_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
1128 | dep_req->cmd != DIGITAL_CMD_DEP_REQ) { | |
1129 | rc = -EIO; | |
1130 | goto exit; | |
1131 | } | |
1132 | ||
6ce30668 MG |
1133 | pfb = dep_req->pfb; |
1134 | ||
05afedcb MG |
1135 | if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { |
1136 | if (ddev->did && (ddev->did == resp->data[3])) { | |
1137 | size++; | |
1138 | } else { | |
1139 | rc = -EIO; | |
1140 | goto exit; | |
1141 | } | |
1142 | } else if (ddev->did) { | |
1143 | rc = -EIO; | |
1144 | goto exit; | |
1145 | } | |
1c7a4c24 | 1146 | |
3e6b0de8 MG |
1147 | if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) { |
1148 | rc = -EIO; | |
1149 | goto exit; | |
1150 | } | |
1151 | ||
6ce30668 | 1152 | if (size > resp->len) { |
1c7a4c24 TE |
1153 | rc = -EIO; |
1154 | goto exit; | |
1155 | } | |
1156 | ||
6ce30668 MG |
1157 | skb_pull(resp, size); |
1158 | ||
1159 | switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { | |
1c7a4c24 | 1160 | case DIGITAL_NFC_DEP_PFB_I_PDU: |
26042530 | 1161 | pr_debug("DIGITAL_NFC_DEP_PFB_I_PDU\n"); |
485fdc9b | 1162 | |
9b5ec0fd | 1163 | if (ddev->atn_count) { |
f23a9868 TE |
1164 | /* The target has received (and replied to) at least one |
1165 | * ATN DEP_REQ. | |
1166 | */ | |
9b5ec0fd MG |
1167 | ddev->atn_count = 0; |
1168 | ||
f23a9868 TE |
1169 | /* pni of resp PDU equal to the target current pni - 1 |
1170 | * means resp is the previous DEP_REQ PDU received from | |
1171 | * the initiator so the target replies with saved_skb | |
1172 | * which is the previous DEP_RES saved in | |
1173 | * digital_tg_send_dep_res(). | |
1174 | */ | |
1175 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) == | |
1176 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni - 1)) { | |
1177 | rc = digital_tg_send_saved_skb(ddev); | |
1178 | if (rc) | |
1179 | goto exit; | |
9b5ec0fd | 1180 | |
f23a9868 TE |
1181 | goto free_resp; |
1182 | } | |
1183 | ||
1184 | /* atn_count > 0 and PDU pni != curr_nfc_dep_pni - 1 | |
1185 | * means the target probably did not received the last | |
1186 | * DEP_REQ PDU sent by the initiator. The target | |
1187 | * fallbacks to normal processing then. | |
1188 | */ | |
1189 | } | |
1190 | ||
1191 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { | |
1192 | PROTOCOL_ERR("14.12.3.4"); | |
1193 | rc = -EIO; | |
1194 | goto exit; | |
9b5ec0fd MG |
1195 | } |
1196 | ||
49dbb14e MG |
1197 | kfree_skb(ddev->saved_skb); |
1198 | ddev->saved_skb = NULL; | |
1199 | ||
c12715ab MG |
1200 | resp = digital_recv_dep_data_gather(ddev, pfb, resp, |
1201 | digital_tg_send_ack, NULL); | |
1202 | if (IS_ERR(resp)) { | |
1203 | rc = PTR_ERR(resp); | |
1204 | resp = NULL; | |
1205 | goto exit; | |
1206 | } | |
1207 | ||
1208 | /* If resp is NULL then we're still chaining so return and | |
1209 | * wait for the next part of the PDU. Else, the PDU is | |
1210 | * complete so pass it up. | |
1211 | */ | |
1212 | if (!resp) | |
1213 | return; | |
1214 | ||
485fdc9b | 1215 | rc = 0; |
1c7a4c24 TE |
1216 | break; |
1217 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: | |
482333b2 TE |
1218 | if (DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { /* NACK */ |
1219 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb + 1) != | |
1220 | ddev->curr_nfc_dep_pni) { | |
49dbb14e MG |
1221 | rc = -EIO; |
1222 | goto exit; | |
1223 | } | |
1224 | ||
482333b2 TE |
1225 | ddev->atn_count = 0; |
1226 | ||
1227 | rc = digital_tg_send_saved_skb(ddev); | |
1228 | if (rc) | |
1229 | goto exit; | |
1230 | ||
1231 | goto free_resp; | |
1232 | } | |
1233 | ||
1234 | /* ACK */ | |
1235 | if (ddev->atn_count) { | |
1236 | /* The target has previously recevied one or more ATN | |
1237 | * PDUs. | |
1238 | */ | |
1239 | ddev->atn_count = 0; | |
9b5ec0fd | 1240 | |
482333b2 TE |
1241 | /* If the ACK PNI is equal to the target PNI - 1 means |
1242 | * that the initiator did not receive the previous PDU | |
1243 | * sent by the target so re-send it. | |
1244 | */ | |
1245 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb + 1) == | |
1246 | ddev->curr_nfc_dep_pni) { | |
9b5ec0fd MG |
1247 | rc = digital_tg_send_saved_skb(ddev); |
1248 | if (rc) | |
1249 | goto exit; | |
1250 | ||
482333b2 | 1251 | goto free_resp; |
9b5ec0fd MG |
1252 | } |
1253 | ||
482333b2 TE |
1254 | /* Otherwise, the target did not receive the previous |
1255 | * ACK PDU from the initiator. Fallback to normal | |
1256 | * processing of chained PDU then. | |
1257 | */ | |
1258 | } | |
485fdc9b | 1259 | |
482333b2 TE |
1260 | /* Keep on sending chained PDU */ |
1261 | if (!ddev->chaining_skb || | |
1262 | DIGITAL_NFC_DEP_PFB_PNI(pfb) != | |
1263 | ddev->curr_nfc_dep_pni) { | |
1264 | rc = -EIO; | |
1265 | goto exit; | |
1266 | } | |
3bd2a5bc | 1267 | |
482333b2 TE |
1268 | kfree_skb(ddev->saved_skb); |
1269 | ddev->saved_skb = NULL; | |
9b5ec0fd | 1270 | |
482333b2 TE |
1271 | rc = digital_tg_send_dep_res(ddev, ddev->chaining_skb); |
1272 | if (rc) | |
1273 | goto exit; | |
3bd2a5bc | 1274 | |
482333b2 | 1275 | goto free_resp; |
1c7a4c24 | 1276 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: |
9b5ec0fd MG |
1277 | if (DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { |
1278 | rc = -EINVAL; | |
1279 | goto exit; | |
1280 | } | |
1281 | ||
1282 | rc = digital_tg_send_atn(ddev); | |
1283 | if (rc) | |
1284 | goto exit; | |
1285 | ||
1286 | ddev->atn_count++; | |
1287 | ||
e200f008 | 1288 | goto free_resp; |
1c7a4c24 TE |
1289 | } |
1290 | ||
1c7a4c24 TE |
1291 | rc = nfc_tm_data_received(ddev->nfc_dev, resp); |
1292 | ||
1293 | exit: | |
3bd2a5bc MG |
1294 | kfree_skb(ddev->chaining_skb); |
1295 | ddev->chaining_skb = NULL; | |
1296 | ||
9b5ec0fd MG |
1297 | ddev->atn_count = 0; |
1298 | ||
49dbb14e MG |
1299 | kfree_skb(ddev->saved_skb); |
1300 | ddev->saved_skb = NULL; | |
1301 | ||
1c7a4c24 TE |
1302 | if (rc) |
1303 | kfree_skb(resp); | |
f23a9868 TE |
1304 | |
1305 | return; | |
1306 | ||
1307 | free_resp: | |
1308 | dev_kfree_skb(resp); | |
1c7a4c24 TE |
1309 | } |
1310 | ||
1311 | int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb) | |
1312 | { | |
1313 | struct digital_dep_req_res *dep_res; | |
3bd2a5bc MG |
1314 | struct sk_buff *chaining_skb, *tmp_skb; |
1315 | int rc; | |
1c7a4c24 TE |
1316 | |
1317 | skb_push(skb, sizeof(struct digital_dep_req_res)); | |
b08147cb | 1318 | |
1c7a4c24 TE |
1319 | dep_res = (struct digital_dep_req_res *)skb->data; |
1320 | ||
1321 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
1322 | dep_res->cmd = DIGITAL_CMD_DEP_RES; | |
1323 | dep_res->pfb = ddev->curr_nfc_dep_pni; | |
1324 | ||
05afedcb MG |
1325 | if (ddev->did) { |
1326 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; | |
1327 | ||
1328 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, | |
1329 | sizeof(ddev->did)); | |
1330 | } | |
1331 | ||
485fdc9b MG |
1332 | ddev->curr_nfc_dep_pni = |
1333 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); | |
1334 | ||
3bd2a5bc | 1335 | chaining_skb = ddev->chaining_skb; |
1c7a4c24 | 1336 | |
3bd2a5bc MG |
1337 | tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_res, NULL); |
1338 | if (IS_ERR(tmp_skb)) | |
1339 | return PTR_ERR(tmp_skb); | |
1340 | ||
1341 | digital_skb_push_dep_sod(ddev, tmp_skb); | |
1342 | ||
1343 | ddev->skb_add_crc(tmp_skb); | |
1c7a4c24 | 1344 | |
1d984c2e | 1345 | ddev->saved_skb = pskb_copy(tmp_skb, GFP_KERNEL); |
49dbb14e | 1346 | |
3bd2a5bc MG |
1347 | rc = digital_tg_send_cmd(ddev, tmp_skb, 1500, digital_tg_recv_dep_req, |
1348 | NULL); | |
1349 | if (rc) { | |
1350 | if (tmp_skb != skb) | |
1351 | kfree_skb(tmp_skb); | |
1352 | ||
1353 | kfree_skb(chaining_skb); | |
1354 | ddev->chaining_skb = NULL; | |
49dbb14e MG |
1355 | |
1356 | kfree_skb(ddev->saved_skb); | |
1357 | ddev->saved_skb = NULL; | |
3bd2a5bc MG |
1358 | } |
1359 | ||
1360 | return rc; | |
1c7a4c24 TE |
1361 | } |
1362 | ||
1363 | static void digital_tg_send_psl_res_complete(struct nfc_digital_dev *ddev, | |
1364 | void *arg, struct sk_buff *resp) | |
1365 | { | |
67af1d7a | 1366 | u8 rf_tech = (unsigned long)arg; |
1c7a4c24 TE |
1367 | |
1368 | if (IS_ERR(resp)) | |
1369 | return; | |
1370 | ||
b711ad52 TE |
1371 | digital_tg_set_rf_tech(ddev, rf_tech); |
1372 | ||
1c7a4c24 TE |
1373 | digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); |
1374 | ||
1375 | digital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL); | |
1376 | ||
1377 | dev_kfree_skb(resp); | |
1378 | } | |
1379 | ||
1380 | static int digital_tg_send_psl_res(struct nfc_digital_dev *ddev, u8 did, | |
1381 | u8 rf_tech) | |
1382 | { | |
1383 | struct digital_psl_res *psl_res; | |
1384 | struct sk_buff *skb; | |
1385 | int rc; | |
1386 | ||
1387 | skb = digital_skb_alloc(ddev, sizeof(struct digital_psl_res)); | |
1388 | if (!skb) | |
1389 | return -ENOMEM; | |
1390 | ||
1391 | skb_put(skb, sizeof(struct digital_psl_res)); | |
1392 | ||
1393 | psl_res = (struct digital_psl_res *)skb->data; | |
1394 | ||
1395 | psl_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
1396 | psl_res->cmd = DIGITAL_CMD_PSL_RES; | |
1397 | psl_res->did = did; | |
1398 | ||
1399 | digital_skb_push_dep_sod(ddev, skb); | |
1400 | ||
1401 | ddev->skb_add_crc(skb); | |
1402 | ||
485fdc9b MG |
1403 | ddev->curr_nfc_dep_pni = 0; |
1404 | ||
1c7a4c24 | 1405 | rc = digital_tg_send_cmd(ddev, skb, 0, digital_tg_send_psl_res_complete, |
67af1d7a | 1406 | (void *)(unsigned long)rf_tech); |
1c7a4c24 TE |
1407 | if (rc) |
1408 | kfree_skb(skb); | |
1409 | ||
1410 | return rc; | |
1411 | } | |
1412 | ||
1413 | static void digital_tg_recv_psl_req(struct nfc_digital_dev *ddev, void *arg, | |
1414 | struct sk_buff *resp) | |
1415 | { | |
1416 | int rc; | |
1417 | struct digital_psl_req *psl_req; | |
1418 | u8 rf_tech; | |
b08147cb | 1419 | u8 dsi, payload_size, payload_bits; |
1c7a4c24 TE |
1420 | |
1421 | if (IS_ERR(resp)) { | |
1422 | rc = PTR_ERR(resp); | |
1423 | resp = NULL; | |
1424 | goto exit; | |
1425 | } | |
1426 | ||
1427 | rc = ddev->skb_check_crc(resp); | |
1428 | if (rc) { | |
1429 | PROTOCOL_ERR("14.4.1.6"); | |
1430 | goto exit; | |
1431 | } | |
1432 | ||
1433 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
1434 | if (rc) { | |
1435 | PROTOCOL_ERR("14.4.1.2"); | |
1436 | goto exit; | |
1437 | } | |
1438 | ||
1439 | psl_req = (struct digital_psl_req *)resp->data; | |
1440 | ||
1441 | if (resp->len != sizeof(struct digital_psl_req) || | |
1442 | psl_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
1443 | psl_req->cmd != DIGITAL_CMD_PSL_REQ) { | |
1444 | rc = -EIO; | |
1445 | goto exit; | |
1446 | } | |
1447 | ||
1448 | dsi = (psl_req->brs >> 3) & 0x07; | |
1449 | switch (dsi) { | |
1450 | case 0: | |
1451 | rf_tech = NFC_DIGITAL_RF_TECH_106A; | |
1452 | break; | |
1453 | case 1: | |
1454 | rf_tech = NFC_DIGITAL_RF_TECH_212F; | |
1455 | break; | |
1456 | case 2: | |
1457 | rf_tech = NFC_DIGITAL_RF_TECH_424F; | |
1458 | break; | |
1459 | default: | |
77d84ff8 | 1460 | pr_err("Unsupported dsi value %d\n", dsi); |
1c7a4c24 TE |
1461 | goto exit; |
1462 | } | |
1463 | ||
b08147cb MG |
1464 | payload_bits = DIGITAL_PAYLOAD_FSL_TO_BITS(psl_req->fsl); |
1465 | payload_size = digital_payload_bits_to_size(payload_bits); | |
1466 | ||
1467 | if (!payload_size || (payload_size > min(ddev->local_payload_max, | |
1468 | ddev->remote_payload_max))) { | |
1469 | rc = -EINVAL; | |
1470 | goto exit; | |
1471 | } | |
1472 | ||
1473 | ddev->local_payload_max = payload_size; | |
1474 | ddev->remote_payload_max = payload_size; | |
1475 | ||
1c7a4c24 TE |
1476 | rc = digital_tg_send_psl_res(ddev, psl_req->did, rf_tech); |
1477 | ||
1478 | exit: | |
1479 | kfree_skb(resp); | |
1480 | } | |
1481 | ||
1482 | static void digital_tg_send_atr_res_complete(struct nfc_digital_dev *ddev, | |
1483 | void *arg, struct sk_buff *resp) | |
1484 | { | |
1485 | int offset; | |
1486 | ||
1487 | if (IS_ERR(resp)) { | |
1488 | digital_poll_next_tech(ddev); | |
1489 | return; | |
1490 | } | |
1491 | ||
1492 | offset = 2; | |
1493 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) | |
1494 | offset++; | |
1495 | ||
9b5ec0fd MG |
1496 | ddev->atn_count = 0; |
1497 | ||
1c7a4c24 TE |
1498 | if (resp->data[offset] == DIGITAL_CMD_PSL_REQ) |
1499 | digital_tg_recv_psl_req(ddev, arg, resp); | |
1500 | else | |
1501 | digital_tg_recv_dep_req(ddev, arg, resp); | |
1502 | } | |
1503 | ||
1504 | static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev, | |
1505 | struct digital_atr_req *atr_req) | |
1506 | { | |
1507 | struct digital_atr_res *atr_res; | |
1508 | struct sk_buff *skb; | |
b08147cb | 1509 | u8 *gb, payload_bits; |
1c7a4c24 TE |
1510 | size_t gb_len; |
1511 | int rc; | |
1512 | ||
1513 | gb = nfc_get_local_general_bytes(ddev->nfc_dev, &gb_len); | |
1514 | if (!gb) | |
1515 | gb_len = 0; | |
1516 | ||
1517 | skb = digital_skb_alloc(ddev, sizeof(struct digital_atr_res) + gb_len); | |
1518 | if (!skb) | |
1519 | return -ENOMEM; | |
1520 | ||
1521 | skb_put(skb, sizeof(struct digital_atr_res)); | |
1522 | atr_res = (struct digital_atr_res *)skb->data; | |
1523 | ||
1524 | memset(atr_res, 0, sizeof(struct digital_atr_res)); | |
1525 | ||
1526 | atr_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; | |
1527 | atr_res->cmd = DIGITAL_CMD_ATR_RES; | |
1528 | memcpy(atr_res->nfcid3, atr_req->nfcid3, sizeof(atr_req->nfcid3)); | |
1a09c56f | 1529 | atr_res->to = DIGITAL_NFC_DEP_TG_MAX_WT; |
b08147cb MG |
1530 | |
1531 | ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; | |
1532 | payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); | |
1533 | atr_res->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); | |
1534 | ||
1c7a4c24 TE |
1535 | if (gb_len) { |
1536 | skb_put(skb, gb_len); | |
1537 | ||
1538 | atr_res->pp |= DIGITAL_GB_BIT; | |
1539 | memcpy(atr_res->gb, gb, gb_len); | |
1540 | } | |
1541 | ||
1542 | digital_skb_push_dep_sod(ddev, skb); | |
1543 | ||
1544 | ddev->skb_add_crc(skb); | |
1545 | ||
485fdc9b MG |
1546 | ddev->curr_nfc_dep_pni = 0; |
1547 | ||
1c7a4c24 TE |
1548 | rc = digital_tg_send_cmd(ddev, skb, 999, |
1549 | digital_tg_send_atr_res_complete, NULL); | |
b15829ba | 1550 | if (rc) |
1c7a4c24 | 1551 | kfree_skb(skb); |
1c7a4c24 TE |
1552 | |
1553 | return rc; | |
1554 | } | |
1555 | ||
1556 | void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg, | |
1557 | struct sk_buff *resp) | |
1558 | { | |
1559 | int rc; | |
1560 | struct digital_atr_req *atr_req; | |
1561 | size_t gb_len, min_size; | |
b08147cb | 1562 | u8 poll_tech_count, payload_bits; |
1c7a4c24 TE |
1563 | |
1564 | if (IS_ERR(resp)) { | |
1565 | rc = PTR_ERR(resp); | |
1566 | resp = NULL; | |
1567 | goto exit; | |
1568 | } | |
1569 | ||
1570 | if (!resp->len) { | |
1571 | rc = -EIO; | |
1572 | goto exit; | |
1573 | } | |
1574 | ||
1575 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) { | |
1576 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 2; | |
b711ad52 | 1577 | digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_106A); |
1c7a4c24 TE |
1578 | } else { |
1579 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 1; | |
b711ad52 | 1580 | digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_212F); |
1c7a4c24 TE |
1581 | } |
1582 | ||
1583 | if (resp->len < min_size) { | |
1584 | rc = -EIO; | |
1585 | goto exit; | |
1586 | } | |
1587 | ||
48e10445 | 1588 | ddev->curr_protocol = NFC_PROTO_NFC_DEP_MASK; |
1c7a4c24 TE |
1589 | |
1590 | rc = ddev->skb_check_crc(resp); | |
1591 | if (rc) { | |
1592 | PROTOCOL_ERR("14.4.1.6"); | |
1593 | goto exit; | |
1594 | } | |
1595 | ||
1596 | rc = digital_skb_pull_dep_sod(ddev, resp); | |
1597 | if (rc) { | |
1598 | PROTOCOL_ERR("14.4.1.2"); | |
1599 | goto exit; | |
1600 | } | |
1601 | ||
1602 | atr_req = (struct digital_atr_req *)resp->data; | |
1603 | ||
1604 | if (atr_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || | |
05afedcb MG |
1605 | atr_req->cmd != DIGITAL_CMD_ATR_REQ || |
1606 | atr_req->did > DIGITAL_DID_MAX) { | |
1c7a4c24 TE |
1607 | rc = -EINVAL; |
1608 | goto exit; | |
1609 | } | |
1610 | ||
b08147cb MG |
1611 | payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_req->pp); |
1612 | ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); | |
1613 | ||
1614 | if (!ddev->remote_payload_max) { | |
1615 | rc = -EINVAL; | |
1616 | goto exit; | |
1617 | } | |
1618 | ||
05afedcb MG |
1619 | ddev->did = atr_req->did; |
1620 | ||
1c7a4c24 TE |
1621 | rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, |
1622 | NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED); | |
1623 | if (rc) | |
1624 | goto exit; | |
1625 | ||
1626 | rc = digital_tg_send_atr_res(ddev, atr_req); | |
1627 | if (rc) | |
1628 | goto exit; | |
1629 | ||
1630 | gb_len = resp->len - sizeof(struct digital_atr_req); | |
0529a7ad MG |
1631 | |
1632 | poll_tech_count = ddev->poll_tech_count; | |
1633 | ddev->poll_tech_count = 0; | |
1634 | ||
1c7a4c24 TE |
1635 | rc = nfc_tm_activated(ddev->nfc_dev, NFC_PROTO_NFC_DEP_MASK, |
1636 | NFC_COMM_PASSIVE, atr_req->gb, gb_len); | |
0529a7ad MG |
1637 | if (rc) { |
1638 | ddev->poll_tech_count = poll_tech_count; | |
1c7a4c24 | 1639 | goto exit; |
0529a7ad | 1640 | } |
1c7a4c24 TE |
1641 | |
1642 | rc = 0; | |
1643 | exit: | |
1644 | if (rc) | |
1645 | digital_poll_next_tech(ddev); | |
1646 | ||
1647 | dev_kfree_skb(resp); | |
1648 | } |