1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * The NFC Controller Interface is the communication protocol between an
4 * NFC Controller (NFCC) and a Device Host (DH).
5 *
6 * Copyright (C) 2014 Marvell International Ltd.
7 * Copyright (C) 2011 Texas Instruments, Inc.
8 *
9 * Written by Ilan Elias <ilane@ti.com>
10 *
11 * Acknowledgements:
12 * This file is based on hci_event.c, which was written
13 * by Maxim Krasnyansky.
14 */
15
16 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
17
18 #include <linux/types.h>
19 #include <linux/interrupt.h>
20 #include <linux/bitops.h>
21 #include <linux/skbuff.h>
22
23 #include "../nfc.h"
24 #include <net/nfc/nci.h>
25 #include <net/nfc/nci_core.h>
26 #include <linux/nfc.h>
27
28 /* Handle NCI Notification packets */
29
nci_core_conn_credits_ntf_packet(struct nci_dev * ndev,struct sk_buff * skb)30 static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
31 struct sk_buff *skb)
32 {
33 struct nci_core_conn_credit_ntf *ntf = (void *) skb->data;
34 struct nci_conn_info *conn_info;
35 int i;
36
37 pr_debug("num_entries %d\n", ntf->num_entries);
38
39 if (ntf->num_entries > NCI_MAX_NUM_CONN)
40 ntf->num_entries = NCI_MAX_NUM_CONN;
41
42 /* update the credits */
43 for (i = 0; i < ntf->num_entries; i++) {
44 ntf->conn_entries[i].conn_id =
45 nci_conn_id(&ntf->conn_entries[i].conn_id);
46
47 pr_debug("entry[%d]: conn_id %d, credits %d\n",
48 i, ntf->conn_entries[i].conn_id,
49 ntf->conn_entries[i].credits);
50
51 conn_info = nci_get_conn_info_by_conn_id(ndev,
52 ntf->conn_entries[i].conn_id);
53 if (!conn_info)
54 return;
55
56 atomic_add(ntf->conn_entries[i].credits,
57 &conn_info->credits_cnt);
58 }
59
60 /* trigger the next tx */
61 if (!skb_queue_empty(&ndev->tx_q))
62 queue_work(ndev->tx_wq, &ndev->tx_work);
63 }
64
nci_core_generic_error_ntf_packet(struct nci_dev * ndev,struct sk_buff * skb)65 static void nci_core_generic_error_ntf_packet(struct nci_dev *ndev,
66 struct sk_buff *skb)
67 {
68 __u8 status = skb->data[0];
69
70 pr_debug("status 0x%x\n", status);
71
72 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
73 /* Activation failed, so complete the request
74 (the state remains the same) */
75 nci_req_complete(ndev, status);
76 }
77 }
78
nci_core_conn_intf_error_ntf_packet(struct nci_dev * ndev,struct sk_buff * skb)79 static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev,
80 struct sk_buff *skb)
81 {
82 struct nci_core_intf_error_ntf *ntf = (void *) skb->data;
83
84 ntf->conn_id = nci_conn_id(&ntf->conn_id);
85
86 pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id);
87
88 /* complete the data exchange transaction, if exists */
89 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
90 nci_data_exchange_complete(ndev, NULL, ntf->conn_id, -EIO);
91 }
92
nci_extract_rf_params_nfca_passive_poll(struct nci_dev * ndev,struct rf_tech_specific_params_nfca_poll * nfca_poll,__u8 * data)93 static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
94 struct rf_tech_specific_params_nfca_poll *nfca_poll,
95 __u8 *data)
96 {
97 nfca_poll->sens_res = __le16_to_cpu(*((__le16 *)data));
98 data += 2;
99
100 nfca_poll->nfcid1_len = min_t(__u8, *data++, NFC_NFCID1_MAXSIZE);
101
102 pr_debug("sens_res 0x%x, nfcid1_len %d\n",
103 nfca_poll->sens_res, nfca_poll->nfcid1_len);
104
105 memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len);
106 data += nfca_poll->nfcid1_len;
107
108 nfca_poll->sel_res_len = *data++;
109
110 if (nfca_poll->sel_res_len != 0)
111 nfca_poll->sel_res = *data++;
112
113 pr_debug("sel_res_len %d, sel_res 0x%x\n",
114 nfca_poll->sel_res_len,
115 nfca_poll->sel_res);
116
117 return data;
118 }
119
nci_extract_rf_params_nfcb_passive_poll(struct nci_dev * ndev,struct rf_tech_specific_params_nfcb_poll * nfcb_poll,__u8 * data)120 static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
121 struct rf_tech_specific_params_nfcb_poll *nfcb_poll,
122 __u8 *data)
123 {
124 nfcb_poll->sensb_res_len = min_t(__u8, *data++, NFC_SENSB_RES_MAXSIZE);
125
126 pr_debug("sensb_res_len %d\n", nfcb_poll->sensb_res_len);
127
128 memcpy(nfcb_poll->sensb_res, data, nfcb_poll->sensb_res_len);
129 data += nfcb_poll->sensb_res_len;
130
131 return data;
132 }
133
nci_extract_rf_params_nfcf_passive_poll(struct nci_dev * ndev,struct rf_tech_specific_params_nfcf_poll * nfcf_poll,__u8 * data)134 static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
135 struct rf_tech_specific_params_nfcf_poll *nfcf_poll,
136 __u8 *data)
137 {
138 nfcf_poll->bit_rate = *data++;
139 nfcf_poll->sensf_res_len = min_t(__u8, *data++, NFC_SENSF_RES_MAXSIZE);
140
141 pr_debug("bit_rate %d, sensf_res_len %d\n",
142 nfcf_poll->bit_rate, nfcf_poll->sensf_res_len);
143
144 memcpy(nfcf_poll->sensf_res, data, nfcf_poll->sensf_res_len);
145 data += nfcf_poll->sensf_res_len;
146
147 return data;
148 }
149
nci_extract_rf_params_nfcv_passive_poll(struct nci_dev * ndev,struct rf_tech_specific_params_nfcv_poll * nfcv_poll,__u8 * data)150 static __u8 *nci_extract_rf_params_nfcv_passive_poll(struct nci_dev *ndev,
151 struct rf_tech_specific_params_nfcv_poll *nfcv_poll,
152 __u8 *data)
153 {
154 ++data;
155 nfcv_poll->dsfid = *data++;
156 memcpy(nfcv_poll->uid, data, NFC_ISO15693_UID_MAXSIZE);
157 data += NFC_ISO15693_UID_MAXSIZE;
158 return data;
159 }
160
nci_extract_rf_params_nfcf_passive_listen(struct nci_dev * ndev,struct rf_tech_specific_params_nfcf_listen * nfcf_listen,__u8 * data)161 static __u8 *nci_extract_rf_params_nfcf_passive_listen(struct nci_dev *ndev,
162 struct rf_tech_specific_params_nfcf_listen *nfcf_listen,
163 __u8 *data)
164 {
165 nfcf_listen->local_nfcid2_len = min_t(__u8, *data++,
166 NFC_NFCID2_MAXSIZE);
167 memcpy(nfcf_listen->local_nfcid2, data, nfcf_listen->local_nfcid2_len);
168 data += nfcf_listen->local_nfcid2_len;
169
170 return data;
171 }
172
nci_get_prop_rf_protocol(struct nci_dev * ndev,__u8 rf_protocol)173 static __u32 nci_get_prop_rf_protocol(struct nci_dev *ndev, __u8 rf_protocol)
174 {
175 if (ndev->ops->get_rfprotocol)
176 return ndev->ops->get_rfprotocol(ndev, rf_protocol);
177 return 0;
178 }
179
nci_add_new_protocol(struct nci_dev * ndev,struct nfc_target * target,__u8 rf_protocol,__u8 rf_tech_and_mode,void * params)180 static int nci_add_new_protocol(struct nci_dev *ndev,
181 struct nfc_target *target,
182 __u8 rf_protocol,
183 __u8 rf_tech_and_mode,
184 void *params)
185 {
186 struct rf_tech_specific_params_nfca_poll *nfca_poll;
187 struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
188 struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
189 struct rf_tech_specific_params_nfcv_poll *nfcv_poll;
190 __u32 protocol;
191
192 if (rf_protocol == NCI_RF_PROTOCOL_T1T)
193 protocol = NFC_PROTO_JEWEL_MASK;
194 else if (rf_protocol == NCI_RF_PROTOCOL_T2T)
195 protocol = NFC_PROTO_MIFARE_MASK;
196 else if (rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)
197 if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE)
198 protocol = NFC_PROTO_ISO14443_MASK;
199 else
200 protocol = NFC_PROTO_ISO14443_B_MASK;
201 else if (rf_protocol == NCI_RF_PROTOCOL_T3T)
202 protocol = NFC_PROTO_FELICA_MASK;
203 else if (rf_protocol == NCI_RF_PROTOCOL_NFC_DEP)
204 protocol = NFC_PROTO_NFC_DEP_MASK;
205 else if (rf_protocol == NCI_RF_PROTOCOL_T5T)
206 protocol = NFC_PROTO_ISO15693_MASK;
207 else
208 protocol = nci_get_prop_rf_protocol(ndev, rf_protocol);
209
210 if (!(protocol & ndev->poll_prots)) {
211 pr_err("the target found does not have the desired protocol\n");
212 return -EPROTO;
213 }
214
215 if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) {
216 nfca_poll = (struct rf_tech_specific_params_nfca_poll *)params;
217
218 target->sens_res = nfca_poll->sens_res;
219 target->sel_res = nfca_poll->sel_res;
220 target->nfcid1_len = nfca_poll->nfcid1_len;
221 if (target->nfcid1_len > 0) {
222 memcpy(target->nfcid1, nfca_poll->nfcid1,
223 target->nfcid1_len);
224 }
225 } else if (rf_tech_and_mode == NCI_NFC_B_PASSIVE_POLL_MODE) {
226 nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params;
227
228 target->sensb_res_len = nfcb_poll->sensb_res_len;
229 if (target->sensb_res_len > 0) {
230 memcpy(target->sensb_res, nfcb_poll->sensb_res,
231 target->sensb_res_len);
232 }
233 } else if (rf_tech_and_mode == NCI_NFC_F_PASSIVE_POLL_MODE) {
234 nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params;
235
236 target->sensf_res_len = nfcf_poll->sensf_res_len;
237 if (target->sensf_res_len > 0) {
238 memcpy(target->sensf_res, nfcf_poll->sensf_res,
239 target->sensf_res_len);
240 }
241 } else if (rf_tech_and_mode == NCI_NFC_V_PASSIVE_POLL_MODE) {
242 nfcv_poll = (struct rf_tech_specific_params_nfcv_poll *)params;
243
244 target->is_iso15693 = 1;
245 target->iso15693_dsfid = nfcv_poll->dsfid;
246 memcpy(target->iso15693_uid, nfcv_poll->uid, NFC_ISO15693_UID_MAXSIZE);
247 } else {
248 pr_err("unsupported rf_tech_and_mode 0x%x\n", rf_tech_and_mode);
249 return -EPROTO;
250 }
251
252 target->supported_protocols |= protocol;
253
254 pr_debug("protocol 0x%x\n", protocol);
255
256 return 0;
257 }
258
nci_add_new_target(struct nci_dev * ndev,struct nci_rf_discover_ntf * ntf)259 static void nci_add_new_target(struct nci_dev *ndev,
260 struct nci_rf_discover_ntf *ntf)
261 {
262 struct nfc_target *target;
263 int i, rc;
264
265 for (i = 0; i < ndev->n_targets; i++) {
266 target = &ndev->targets[i];
267 if (target->logical_idx == ntf->rf_discovery_id) {
268 /* This target already exists, add the new protocol */
269 nci_add_new_protocol(ndev, target, ntf->rf_protocol,
270 ntf->rf_tech_and_mode,
271 &ntf->rf_tech_specific_params);
272 return;
273 }
274 }
275
276 /* This is a new target, check if we've enough room */
277 if (ndev->n_targets == NCI_MAX_DISCOVERED_TARGETS) {
278 pr_debug("not enough room, ignoring new target...\n");
279 return;
280 }
281
282 target = &ndev->targets[ndev->n_targets];
283
284 rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
285 ntf->rf_tech_and_mode,
286 &ntf->rf_tech_specific_params);
287 if (!rc) {
288 target->logical_idx = ntf->rf_discovery_id;
289 ndev->n_targets++;
290
291 pr_debug("logical idx %d, n_targets %d\n", target->logical_idx,
292 ndev->n_targets);
293 }
294 }
295
nci_clear_target_list(struct nci_dev * ndev)296 void nci_clear_target_list(struct nci_dev *ndev)
297 {
298 memset(ndev->targets, 0,
299 (sizeof(struct nfc_target)*NCI_MAX_DISCOVERED_TARGETS));
300
301 ndev->n_targets = 0;
302 }
303
nci_rf_discover_ntf_packet(struct nci_dev * ndev,struct sk_buff * skb)304 static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
305 struct sk_buff *skb)
306 {
307 struct nci_rf_discover_ntf ntf;
308 __u8 *data = skb->data;
309 bool add_target = true;
310
311 ntf.rf_discovery_id = *data++;
312 ntf.rf_protocol = *data++;
313 ntf.rf_tech_and_mode = *data++;
314 ntf.rf_tech_specific_params_len = *data++;
315
316 pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
317 pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
318 pr_debug("rf_tech_and_mode 0x%x\n", ntf.rf_tech_and_mode);
319 pr_debug("rf_tech_specific_params_len %d\n",
320 ntf.rf_tech_specific_params_len);
321
322 if (ntf.rf_tech_specific_params_len > 0) {
323 switch (ntf.rf_tech_and_mode) {
324 case NCI_NFC_A_PASSIVE_POLL_MODE:
325 data = nci_extract_rf_params_nfca_passive_poll(ndev,
326 &(ntf.rf_tech_specific_params.nfca_poll), data);
327 break;
328
329 case NCI_NFC_B_PASSIVE_POLL_MODE:
330 data = nci_extract_rf_params_nfcb_passive_poll(ndev,
331 &(ntf.rf_tech_specific_params.nfcb_poll), data);
332 break;
333
334 case NCI_NFC_F_PASSIVE_POLL_MODE:
335 data = nci_extract_rf_params_nfcf_passive_poll(ndev,
336 &(ntf.rf_tech_specific_params.nfcf_poll), data);
337 break;
338
339 case NCI_NFC_V_PASSIVE_POLL_MODE:
340 data = nci_extract_rf_params_nfcv_passive_poll(ndev,
341 &(ntf.rf_tech_specific_params.nfcv_poll), data);
342 break;
343
344 default:
345 pr_err("unsupported rf_tech_and_mode 0x%x\n",
346 ntf.rf_tech_and_mode);
347 data += ntf.rf_tech_specific_params_len;
348 add_target = false;
349 }
350 }
351
352 ntf.ntf_type = *data++;
353 pr_debug("ntf_type %d\n", ntf.ntf_type);
354
355 if (add_target == true)
356 nci_add_new_target(ndev, &ntf);
357
358 if (ntf.ntf_type == NCI_DISCOVER_NTF_TYPE_MORE) {
359 atomic_set(&ndev->state, NCI_W4_ALL_DISCOVERIES);
360 } else {
361 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
362 nfc_targets_found(ndev->nfc_dev, ndev->targets,
363 ndev->n_targets);
364 }
365 }
366
nci_extract_activation_params_iso_dep(struct nci_dev * ndev,struct nci_rf_intf_activated_ntf * ntf,__u8 * data)367 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
368 struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
369 {
370 struct activation_params_nfca_poll_iso_dep *nfca_poll;
371 struct activation_params_nfcb_poll_iso_dep *nfcb_poll;
372
373 switch (ntf->activation_rf_tech_and_mode) {
374 case NCI_NFC_A_PASSIVE_POLL_MODE:
375 nfca_poll = &ntf->activation_params.nfca_poll_iso_dep;
376 nfca_poll->rats_res_len = min_t(__u8, *data++, 20);
377 pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len);
378 if (nfca_poll->rats_res_len > 0) {
379 memcpy(nfca_poll->rats_res,
380 data, nfca_poll->rats_res_len);
381 }
382 break;
383
384 case NCI_NFC_B_PASSIVE_POLL_MODE:
385 nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep;
386 nfcb_poll->attrib_res_len = min_t(__u8, *data++, 50);
387 pr_debug("attrib_res_len %d\n", nfcb_poll->attrib_res_len);
388 if (nfcb_poll->attrib_res_len > 0) {
389 memcpy(nfcb_poll->attrib_res,
390 data, nfcb_poll->attrib_res_len);
391 }
392 break;
393
394 default:
395 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
396 ntf->activation_rf_tech_and_mode);
397 return NCI_STATUS_RF_PROTOCOL_ERROR;
398 }
399
400 return NCI_STATUS_OK;
401 }
402
nci_extract_activation_params_nfc_dep(struct nci_dev * ndev,struct nci_rf_intf_activated_ntf * ntf,__u8 * data)403 static int nci_extract_activation_params_nfc_dep(struct nci_dev *ndev,
404 struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
405 {
406 struct activation_params_poll_nfc_dep *poll;
407 struct activation_params_listen_nfc_dep *listen;
408
409 switch (ntf->activation_rf_tech_and_mode) {
410 case NCI_NFC_A_PASSIVE_POLL_MODE:
411 case NCI_NFC_F_PASSIVE_POLL_MODE:
412 poll = &ntf->activation_params.poll_nfc_dep;
413 poll->atr_res_len = min_t(__u8, *data++,
414 NFC_ATR_RES_MAXSIZE - 2);
415 pr_debug("atr_res_len %d\n", poll->atr_res_len);
416 if (poll->atr_res_len > 0)
417 memcpy(poll->atr_res, data, poll->atr_res_len);
418 break;
419
420 case NCI_NFC_A_PASSIVE_LISTEN_MODE:
421 case NCI_NFC_F_PASSIVE_LISTEN_MODE:
422 listen = &ntf->activation_params.listen_nfc_dep;
423 listen->atr_req_len = min_t(__u8, *data++,
424 NFC_ATR_REQ_MAXSIZE - 2);
425 pr_debug("atr_req_len %d\n", listen->atr_req_len);
426 if (listen->atr_req_len > 0)
427 memcpy(listen->atr_req, data, listen->atr_req_len);
428 break;
429
430 default:
431 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
432 ntf->activation_rf_tech_and_mode);
433 return NCI_STATUS_RF_PROTOCOL_ERROR;
434 }
435
436 return NCI_STATUS_OK;
437 }
438
nci_target_auto_activated(struct nci_dev * ndev,struct nci_rf_intf_activated_ntf * ntf)439 static void nci_target_auto_activated(struct nci_dev *ndev,
440 struct nci_rf_intf_activated_ntf *ntf)
441 {
442 struct nfc_target *target;
443 int rc;
444
445 target = &ndev->targets[ndev->n_targets];
446
447 rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
448 ntf->activation_rf_tech_and_mode,
449 &ntf->rf_tech_specific_params);
450 if (rc)
451 return;
452
453 target->logical_idx = ntf->rf_discovery_id;
454 ndev->n_targets++;
455
456 pr_debug("logical idx %d, n_targets %d\n",
457 target->logical_idx, ndev->n_targets);
458
459 nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets);
460 }
461
nci_store_general_bytes_nfc_dep(struct nci_dev * ndev,struct nci_rf_intf_activated_ntf * ntf)462 static int nci_store_general_bytes_nfc_dep(struct nci_dev *ndev,
463 struct nci_rf_intf_activated_ntf *ntf)
464 {
465 ndev->remote_gb_len = 0;
466
467 if (ntf->activation_params_len <= 0)
468 return NCI_STATUS_OK;
469
470 switch (ntf->activation_rf_tech_and_mode) {
471 case NCI_NFC_A_PASSIVE_POLL_MODE:
472 case NCI_NFC_F_PASSIVE_POLL_MODE:
473 ndev->remote_gb_len = min_t(__u8,
474 (ntf->activation_params.poll_nfc_dep.atr_res_len
475 - NFC_ATR_RES_GT_OFFSET),
476 NFC_ATR_RES_GB_MAXSIZE);
477 memcpy(ndev->remote_gb,
478 (ntf->activation_params.poll_nfc_dep.atr_res
479 + NFC_ATR_RES_GT_OFFSET),
480 ndev->remote_gb_len);
481 break;
482
483 case NCI_NFC_A_PASSIVE_LISTEN_MODE:
484 case NCI_NFC_F_PASSIVE_LISTEN_MODE:
485 ndev->remote_gb_len = min_t(__u8,
486 (ntf->activation_params.listen_nfc_dep.atr_req_len
487 - NFC_ATR_REQ_GT_OFFSET),
488 NFC_ATR_REQ_GB_MAXSIZE);
489 memcpy(ndev->remote_gb,
490 (ntf->activation_params.listen_nfc_dep.atr_req
491 + NFC_ATR_REQ_GT_OFFSET),
492 ndev->remote_gb_len);
493 break;
494
495 default:
496 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
497 ntf->activation_rf_tech_and_mode);
498 return NCI_STATUS_RF_PROTOCOL_ERROR;
499 }
500
501 return NCI_STATUS_OK;
502 }
503
nci_rf_intf_activated_ntf_packet(struct nci_dev * ndev,struct sk_buff * skb)504 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
505 struct sk_buff *skb)
506 {
507 struct nci_conn_info *conn_info;
508 struct nci_rf_intf_activated_ntf ntf;
509 __u8 *data = skb->data;
510 int err = NCI_STATUS_OK;
511
512 ntf.rf_discovery_id = *data++;
513 ntf.rf_interface = *data++;
514 ntf.rf_protocol = *data++;
515 ntf.activation_rf_tech_and_mode = *data++;
516 ntf.max_data_pkt_payload_size = *data++;
517 ntf.initial_num_credits = *data++;
518 ntf.rf_tech_specific_params_len = *data++;
519
520 pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
521 pr_debug("rf_interface 0x%x\n", ntf.rf_interface);
522 pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
523 pr_debug("activation_rf_tech_and_mode 0x%x\n",
524 ntf.activation_rf_tech_and_mode);
525 pr_debug("max_data_pkt_payload_size 0x%x\n",
526 ntf.max_data_pkt_payload_size);
527 pr_debug("initial_num_credits 0x%x\n",
528 ntf.initial_num_credits);
529 pr_debug("rf_tech_specific_params_len %d\n",
530 ntf.rf_tech_specific_params_len);
531
532 /* If this contains a value of 0x00 (NFCEE Direct RF
533 * Interface) then all following parameters SHALL contain a
534 * value of 0 and SHALL be ignored.
535 */
536 if (ntf.rf_interface == NCI_RF_INTERFACE_NFCEE_DIRECT)
537 goto listen;
538
539 if (ntf.rf_tech_specific_params_len > 0) {
540 switch (ntf.activation_rf_tech_and_mode) {
541 case NCI_NFC_A_PASSIVE_POLL_MODE:
542 data = nci_extract_rf_params_nfca_passive_poll(ndev,
543 &(ntf.rf_tech_specific_params.nfca_poll), data);
544 break;
545
546 case NCI_NFC_B_PASSIVE_POLL_MODE:
547 data = nci_extract_rf_params_nfcb_passive_poll(ndev,
548 &(ntf.rf_tech_specific_params.nfcb_poll), data);
549 break;
550
551 case NCI_NFC_F_PASSIVE_POLL_MODE:
552 data = nci_extract_rf_params_nfcf_passive_poll(ndev,
553 &(ntf.rf_tech_specific_params.nfcf_poll), data);
554 break;
555
556 case NCI_NFC_V_PASSIVE_POLL_MODE:
557 data = nci_extract_rf_params_nfcv_passive_poll(ndev,
558 &(ntf.rf_tech_specific_params.nfcv_poll), data);
559 break;
560
561 case NCI_NFC_A_PASSIVE_LISTEN_MODE:
562 /* no RF technology specific parameters */
563 break;
564
565 case NCI_NFC_F_PASSIVE_LISTEN_MODE:
566 data = nci_extract_rf_params_nfcf_passive_listen(ndev,
567 &(ntf.rf_tech_specific_params.nfcf_listen),
568 data);
569 break;
570
571 default:
572 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
573 ntf.activation_rf_tech_and_mode);
574 err = NCI_STATUS_RF_PROTOCOL_ERROR;
575 goto exit;
576 }
577 }
578
579 ntf.data_exch_rf_tech_and_mode = *data++;
580 ntf.data_exch_tx_bit_rate = *data++;
581 ntf.data_exch_rx_bit_rate = *data++;
582 ntf.activation_params_len = *data++;
583
584 pr_debug("data_exch_rf_tech_and_mode 0x%x\n",
585 ntf.data_exch_rf_tech_and_mode);
586 pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate);
587 pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate);
588 pr_debug("activation_params_len %d\n", ntf.activation_params_len);
589
590 if (ntf.activation_params_len > 0) {
591 switch (ntf.rf_interface) {
592 case NCI_RF_INTERFACE_ISO_DEP:
593 err = nci_extract_activation_params_iso_dep(ndev,
594 &ntf, data);
595 break;
596
597 case NCI_RF_INTERFACE_NFC_DEP:
598 err = nci_extract_activation_params_nfc_dep(ndev,
599 &ntf, data);
600 break;
601
602 case NCI_RF_INTERFACE_FRAME:
603 /* no activation params */
604 break;
605
606 default:
607 pr_err("unsupported rf_interface 0x%x\n",
608 ntf.rf_interface);
609 err = NCI_STATUS_RF_PROTOCOL_ERROR;
610 break;
611 }
612 }
613
614 exit:
615 if (err == NCI_STATUS_OK) {
616 conn_info = ndev->rf_conn_info;
617 if (!conn_info)
618 return;
619
620 conn_info->max_pkt_payload_len = ntf.max_data_pkt_payload_size;
621 conn_info->initial_num_credits = ntf.initial_num_credits;
622
623 /* set the available credits to initial value */
624 atomic_set(&conn_info->credits_cnt,
625 conn_info->initial_num_credits);
626
627 /* store general bytes to be reported later in dep_link_up */
628 if (ntf.rf_interface == NCI_RF_INTERFACE_NFC_DEP) {
629 err = nci_store_general_bytes_nfc_dep(ndev, &ntf);
630 if (err != NCI_STATUS_OK)
631 pr_err("unable to store general bytes\n");
632 }
633 }
634
635 if (!(ntf.activation_rf_tech_and_mode & NCI_RF_TECH_MODE_LISTEN_MASK)) {
636 /* Poll mode */
637 if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
638 /* A single target was found and activated
639 * automatically */
640 atomic_set(&ndev->state, NCI_POLL_ACTIVE);
641 if (err == NCI_STATUS_OK)
642 nci_target_auto_activated(ndev, &ntf);
643 } else { /* ndev->state == NCI_W4_HOST_SELECT */
644 /* A selected target was activated, so complete the
645 * request */
646 atomic_set(&ndev->state, NCI_POLL_ACTIVE);
647 nci_req_complete(ndev, err);
648 }
649 } else {
650 listen:
651 /* Listen mode */
652 atomic_set(&ndev->state, NCI_LISTEN_ACTIVE);
653 if (err == NCI_STATUS_OK &&
654 ntf.rf_protocol == NCI_RF_PROTOCOL_NFC_DEP) {
655 err = nfc_tm_activated(ndev->nfc_dev,
656 NFC_PROTO_NFC_DEP_MASK,
657 NFC_COMM_PASSIVE,
658 ndev->remote_gb,
659 ndev->remote_gb_len);
660 if (err != NCI_STATUS_OK)
661 pr_err("error when signaling tm activation\n");
662 }
663 }
664 }
665
nci_rf_deactivate_ntf_packet(struct nci_dev * ndev,struct sk_buff * skb)666 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
667 struct sk_buff *skb)
668 {
669 struct nci_conn_info *conn_info;
670 struct nci_rf_deactivate_ntf *ntf = (void *) skb->data;
671
672 pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
673
674 conn_info = ndev->rf_conn_info;
675 if (!conn_info)
676 return;
677
678 /* drop tx data queue */
679 skb_queue_purge(&ndev->tx_q);
680
681 /* drop partial rx data packet */
682 if (ndev->rx_data_reassembly) {
683 kfree_skb(ndev->rx_data_reassembly);
684 ndev->rx_data_reassembly = NULL;
685 }
686
687 /* complete the data exchange transaction, if exists */
688 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
689 nci_data_exchange_complete(ndev, NULL, NCI_STATIC_RF_CONN_ID,
690 -EIO);
691
692 switch (ntf->type) {
693 case NCI_DEACTIVATE_TYPE_IDLE_MODE:
694 nci_clear_target_list(ndev);
695 atomic_set(&ndev->state, NCI_IDLE);
696 break;
697 case NCI_DEACTIVATE_TYPE_SLEEP_MODE:
698 case NCI_DEACTIVATE_TYPE_SLEEP_AF_MODE:
699 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
700 break;
701 case NCI_DEACTIVATE_TYPE_DISCOVERY:
702 nci_clear_target_list(ndev);
703 atomic_set(&ndev->state, NCI_DISCOVERY);
704 break;
705 }
706
707 nci_req_complete(ndev, NCI_STATUS_OK);
708 }
709
nci_nfcee_discover_ntf_packet(struct nci_dev * ndev,struct sk_buff * skb)710 static void nci_nfcee_discover_ntf_packet(struct nci_dev *ndev,
711 struct sk_buff *skb)
712 {
713 u8 status = NCI_STATUS_OK;
714 struct nci_nfcee_discover_ntf *nfcee_ntf =
715 (struct nci_nfcee_discover_ntf *)skb->data;
716
717 pr_debug("\n");
718
719 /* NFCForum NCI 9.2.1 HCI Network Specific Handling
720 * If the NFCC supports the HCI Network, it SHALL return one,
721 * and only one, NFCEE_DISCOVER_NTF with a Protocol type of
722 * “HCI Access”, even if the HCI Network contains multiple NFCEEs.
723 */
724 ndev->hci_dev->nfcee_id = nfcee_ntf->nfcee_id;
725 ndev->cur_params.id = nfcee_ntf->nfcee_id;
726
727 nci_req_complete(ndev, status);
728 }
729
nci_nfcee_action_ntf_packet(struct nci_dev * ndev,struct sk_buff * skb)730 static void nci_nfcee_action_ntf_packet(struct nci_dev *ndev,
731 struct sk_buff *skb)
732 {
733 pr_debug("\n");
734 }
735
nci_ntf_packet(struct nci_dev * ndev,struct sk_buff * skb)736 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
737 {
738 __u16 ntf_opcode = nci_opcode(skb->data);
739
740 pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
741 nci_pbf(skb->data),
742 nci_opcode_gid(ntf_opcode),
743 nci_opcode_oid(ntf_opcode),
744 nci_plen(skb->data));
745
746 /* strip the nci control header */
747 skb_pull(skb, NCI_CTRL_HDR_SIZE);
748
749 if (nci_opcode_gid(ntf_opcode) == NCI_GID_PROPRIETARY) {
750 if (nci_prop_ntf_packet(ndev, ntf_opcode, skb) == -ENOTSUPP) {
751 pr_err("unsupported ntf opcode 0x%x\n",
752 ntf_opcode);
753 }
754
755 goto end;
756 }
757
758 switch (ntf_opcode) {
759 case NCI_OP_CORE_CONN_CREDITS_NTF:
760 nci_core_conn_credits_ntf_packet(ndev, skb);
761 break;
762
763 case NCI_OP_CORE_GENERIC_ERROR_NTF:
764 nci_core_generic_error_ntf_packet(ndev, skb);
765 break;
766
767 case NCI_OP_CORE_INTF_ERROR_NTF:
768 nci_core_conn_intf_error_ntf_packet(ndev, skb);
769 break;
770
771 case NCI_OP_RF_DISCOVER_NTF:
772 nci_rf_discover_ntf_packet(ndev, skb);
773 break;
774
775 case NCI_OP_RF_INTF_ACTIVATED_NTF:
776 nci_rf_intf_activated_ntf_packet(ndev, skb);
777 break;
778
779 case NCI_OP_RF_DEACTIVATE_NTF:
780 nci_rf_deactivate_ntf_packet(ndev, skb);
781 break;
782
783 case NCI_OP_NFCEE_DISCOVER_NTF:
784 nci_nfcee_discover_ntf_packet(ndev, skb);
785 break;
786
787 case NCI_OP_RF_NFCEE_ACTION_NTF:
788 nci_nfcee_action_ntf_packet(ndev, skb);
789 break;
790
791 default:
792 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode);
793 break;
794 }
795
796 nci_core_ntf_packet(ndev, ntf_opcode, skb);
797 end:
798 kfree_skb(skb);
799 }
800
