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Linux/net/nfc/nci/ntf.c

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  1 /*
  2  *  The NFC Controller Interface is the communication protocol between an
  3  *  NFC Controller (NFCC) and a Device Host (DH).
  4  *
  5  *  Copyright (C) 2014 Marvell International Ltd.
  6  *  Copyright (C) 2011 Texas Instruments, Inc.
  7  *
  8  *  Written by Ilan Elias <ilane@ti.com>
  9  *
 10  *  Acknowledgements:
 11  *  This file is based on hci_event.c, which was written
 12  *  by Maxim Krasnyansky.
 13  *
 14  *  This program is free software; you can redistribute it and/or modify
 15  *  it under the terms of the GNU General Public License version 2
 16  *  as published by the Free Software Foundation
 17  *
 18  *  This program is distributed in the hope that it will be useful,
 19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 21  *  GNU General Public License for more details.
 22  *
 23  *  You should have received a copy of the GNU General Public License
 24  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 25  *
 26  */
 27 
 28 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
 29 
 30 #include <linux/types.h>
 31 #include <linux/interrupt.h>
 32 #include <linux/bitops.h>
 33 #include <linux/skbuff.h>
 34 
 35 #include "../nfc.h"
 36 #include <net/nfc/nci.h>
 37 #include <net/nfc/nci_core.h>
 38 #include <linux/nfc.h>
 39 
 40 /* Handle NCI Notification packets */
 41 
 42 static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
 43                                              struct sk_buff *skb)
 44 {
 45         struct nci_core_conn_credit_ntf *ntf = (void *) skb->data;
 46         struct nci_conn_info    *conn_info;
 47         int i;
 48 
 49         pr_debug("num_entries %d\n", ntf->num_entries);
 50 
 51         if (ntf->num_entries > NCI_MAX_NUM_CONN)
 52                 ntf->num_entries = NCI_MAX_NUM_CONN;
 53 
 54         /* update the credits */
 55         for (i = 0; i < ntf->num_entries; i++) {
 56                 ntf->conn_entries[i].conn_id =
 57                         nci_conn_id(&ntf->conn_entries[i].conn_id);
 58 
 59                 pr_debug("entry[%d]: conn_id %d, credits %d\n",
 60                          i, ntf->conn_entries[i].conn_id,
 61                          ntf->conn_entries[i].credits);
 62 
 63                 conn_info = nci_get_conn_info_by_conn_id(ndev,
 64                                                          ntf->conn_entries[i].conn_id);
 65                 if (!conn_info)
 66                         return;
 67 
 68                 atomic_add(ntf->conn_entries[i].credits,
 69                            &conn_info->credits_cnt);
 70         }
 71 
 72         /* trigger the next tx */
 73         if (!skb_queue_empty(&ndev->tx_q))
 74                 queue_work(ndev->tx_wq, &ndev->tx_work);
 75 }
 76 
 77 static void nci_core_generic_error_ntf_packet(struct nci_dev *ndev,
 78                                               struct sk_buff *skb)
 79 {
 80         __u8 status = skb->data[0];
 81 
 82         pr_debug("status 0x%x\n", status);
 83 
 84         if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
 85                 /* Activation failed, so complete the request
 86                    (the state remains the same) */
 87                 nci_req_complete(ndev, status);
 88         }
 89 }
 90 
 91 static void nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev,
 92                                                 struct sk_buff *skb)
 93 {
 94         struct nci_core_intf_error_ntf *ntf = (void *) skb->data;
 95 
 96         ntf->conn_id = nci_conn_id(&ntf->conn_id);
 97 
 98         pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id);
 99 
100         /* complete the data exchange transaction, if exists */
101         if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
102                 nci_data_exchange_complete(ndev, NULL, ntf->conn_id, -EIO);
103 }
104 
105 static __u8 *nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
106                         struct rf_tech_specific_params_nfca_poll *nfca_poll,
107                                                      __u8 *data)
108 {
109         nfca_poll->sens_res = __le16_to_cpu(*((__le16 *)data));
110         data += 2;
111 
112         nfca_poll->nfcid1_len = min_t(__u8, *data++, NFC_NFCID1_MAXSIZE);
113 
114         pr_debug("sens_res 0x%x, nfcid1_len %d\n",
115                  nfca_poll->sens_res, nfca_poll->nfcid1_len);
116 
117         memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len);
118         data += nfca_poll->nfcid1_len;
119 
120         nfca_poll->sel_res_len = *data++;
121 
122         if (nfca_poll->sel_res_len != 0)
123                 nfca_poll->sel_res = *data++;
124 
125         pr_debug("sel_res_len %d, sel_res 0x%x\n",
126                  nfca_poll->sel_res_len,
127                  nfca_poll->sel_res);
128 
129         return data;
130 }
131 
132 static __u8 *nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
133                         struct rf_tech_specific_params_nfcb_poll *nfcb_poll,
134                                                      __u8 *data)
135 {
136         nfcb_poll->sensb_res_len = min_t(__u8, *data++, NFC_SENSB_RES_MAXSIZE);
137 
138         pr_debug("sensb_res_len %d\n", nfcb_poll->sensb_res_len);
139 
140         memcpy(nfcb_poll->sensb_res, data, nfcb_poll->sensb_res_len);
141         data += nfcb_poll->sensb_res_len;
142 
143         return data;
144 }
145 
146 static __u8 *nci_extract_rf_params_nfcf_passive_poll(struct nci_dev *ndev,
147                         struct rf_tech_specific_params_nfcf_poll *nfcf_poll,
148                                                      __u8 *data)
149 {
150         nfcf_poll->bit_rate = *data++;
151         nfcf_poll->sensf_res_len = min_t(__u8, *data++, NFC_SENSF_RES_MAXSIZE);
152 
153         pr_debug("bit_rate %d, sensf_res_len %d\n",
154                  nfcf_poll->bit_rate, nfcf_poll->sensf_res_len);
155 
156         memcpy(nfcf_poll->sensf_res, data, nfcf_poll->sensf_res_len);
157         data += nfcf_poll->sensf_res_len;
158 
159         return data;
160 }
161 
162 static __u8 *nci_extract_rf_params_nfcv_passive_poll(struct nci_dev *ndev,
163                         struct rf_tech_specific_params_nfcv_poll *nfcv_poll,
164                                                      __u8 *data)
165 {
166         ++data;
167         nfcv_poll->dsfid = *data++;
168         memcpy(nfcv_poll->uid, data, NFC_ISO15693_UID_MAXSIZE);
169         data += NFC_ISO15693_UID_MAXSIZE;
170         return data;
171 }
172 
173 static __u8 *nci_extract_rf_params_nfcf_passive_listen(struct nci_dev *ndev,
174                         struct rf_tech_specific_params_nfcf_listen *nfcf_listen,
175                                                      __u8 *data)
176 {
177         nfcf_listen->local_nfcid2_len = min_t(__u8, *data++,
178                                               NFC_NFCID2_MAXSIZE);
179         memcpy(nfcf_listen->local_nfcid2, data, nfcf_listen->local_nfcid2_len);
180         data += nfcf_listen->local_nfcid2_len;
181 
182         return data;
183 }
184 
185 static __u32 nci_get_prop_rf_protocol(struct nci_dev *ndev, __u8 rf_protocol)
186 {
187         if (ndev->ops->get_rfprotocol)
188                 return ndev->ops->get_rfprotocol(ndev, rf_protocol);
189         return 0;
190 }
191 
192 static int nci_add_new_protocol(struct nci_dev *ndev,
193                                 struct nfc_target *target,
194                                 __u8 rf_protocol,
195                                 __u8 rf_tech_and_mode,
196                                 void *params)
197 {
198         struct rf_tech_specific_params_nfca_poll *nfca_poll;
199         struct rf_tech_specific_params_nfcb_poll *nfcb_poll;
200         struct rf_tech_specific_params_nfcf_poll *nfcf_poll;
201         struct rf_tech_specific_params_nfcv_poll *nfcv_poll;
202         __u32 protocol;
203 
204         if (rf_protocol == NCI_RF_PROTOCOL_T1T)
205                 protocol = NFC_PROTO_JEWEL_MASK;
206         else if (rf_protocol == NCI_RF_PROTOCOL_T2T)
207                 protocol = NFC_PROTO_MIFARE_MASK;
208         else if (rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)
209                 if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE)
210                         protocol = NFC_PROTO_ISO14443_MASK;
211                 else
212                         protocol = NFC_PROTO_ISO14443_B_MASK;
213         else if (rf_protocol == NCI_RF_PROTOCOL_T3T)
214                 protocol = NFC_PROTO_FELICA_MASK;
215         else if (rf_protocol == NCI_RF_PROTOCOL_NFC_DEP)
216                 protocol = NFC_PROTO_NFC_DEP_MASK;
217         else if (rf_protocol == NCI_RF_PROTOCOL_T5T)
218                 protocol = NFC_PROTO_ISO15693_MASK;
219         else
220                 protocol = nci_get_prop_rf_protocol(ndev, rf_protocol);
221 
222         if (!(protocol & ndev->poll_prots)) {
223                 pr_err("the target found does not have the desired protocol\n");
224                 return -EPROTO;
225         }
226 
227         if (rf_tech_and_mode == NCI_NFC_A_PASSIVE_POLL_MODE) {
228                 nfca_poll = (struct rf_tech_specific_params_nfca_poll *)params;
229 
230                 target->sens_res = nfca_poll->sens_res;
231                 target->sel_res = nfca_poll->sel_res;
232                 target->nfcid1_len = nfca_poll->nfcid1_len;
233                 if (target->nfcid1_len > 0) {
234                         memcpy(target->nfcid1, nfca_poll->nfcid1,
235                                target->nfcid1_len);
236                 }
237         } else if (rf_tech_and_mode == NCI_NFC_B_PASSIVE_POLL_MODE) {
238                 nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params;
239 
240                 target->sensb_res_len = nfcb_poll->sensb_res_len;
241                 if (target->sensb_res_len > 0) {
242                         memcpy(target->sensb_res, nfcb_poll->sensb_res,
243                                target->sensb_res_len);
244                 }
245         } else if (rf_tech_and_mode == NCI_NFC_F_PASSIVE_POLL_MODE) {
246                 nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params;
247 
248                 target->sensf_res_len = nfcf_poll->sensf_res_len;
249                 if (target->sensf_res_len > 0) {
250                         memcpy(target->sensf_res, nfcf_poll->sensf_res,
251                                target->sensf_res_len);
252                 }
253         } else if (rf_tech_and_mode == NCI_NFC_V_PASSIVE_POLL_MODE) {
254                 nfcv_poll = (struct rf_tech_specific_params_nfcv_poll *)params;
255 
256                 target->is_iso15693 = 1;
257                 target->iso15693_dsfid = nfcv_poll->dsfid;
258                 memcpy(target->iso15693_uid, nfcv_poll->uid, NFC_ISO15693_UID_MAXSIZE);
259         } else {
260                 pr_err("unsupported rf_tech_and_mode 0x%x\n", rf_tech_and_mode);
261                 return -EPROTO;
262         }
263 
264         target->supported_protocols |= protocol;
265 
266         pr_debug("protocol 0x%x\n", protocol);
267 
268         return 0;
269 }
270 
271 static void nci_add_new_target(struct nci_dev *ndev,
272                                struct nci_rf_discover_ntf *ntf)
273 {
274         struct nfc_target *target;
275         int i, rc;
276 
277         for (i = 0; i < ndev->n_targets; i++) {
278                 target = &ndev->targets[i];
279                 if (target->logical_idx == ntf->rf_discovery_id) {
280                         /* This target already exists, add the new protocol */
281                         nci_add_new_protocol(ndev, target, ntf->rf_protocol,
282                                              ntf->rf_tech_and_mode,
283                                              &ntf->rf_tech_specific_params);
284                         return;
285                 }
286         }
287 
288         /* This is a new target, check if we've enough room */
289         if (ndev->n_targets == NCI_MAX_DISCOVERED_TARGETS) {
290                 pr_debug("not enough room, ignoring new target...\n");
291                 return;
292         }
293 
294         target = &ndev->targets[ndev->n_targets];
295 
296         rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
297                                   ntf->rf_tech_and_mode,
298                                   &ntf->rf_tech_specific_params);
299         if (!rc) {
300                 target->logical_idx = ntf->rf_discovery_id;
301                 ndev->n_targets++;
302 
303                 pr_debug("logical idx %d, n_targets %d\n", target->logical_idx,
304                          ndev->n_targets);
305         }
306 }
307 
308 void nci_clear_target_list(struct nci_dev *ndev)
309 {
310         memset(ndev->targets, 0,
311                (sizeof(struct nfc_target)*NCI_MAX_DISCOVERED_TARGETS));
312 
313         ndev->n_targets = 0;
314 }
315 
316 static void nci_rf_discover_ntf_packet(struct nci_dev *ndev,
317                                        struct sk_buff *skb)
318 {
319         struct nci_rf_discover_ntf ntf;
320         __u8 *data = skb->data;
321         bool add_target = true;
322 
323         ntf.rf_discovery_id = *data++;
324         ntf.rf_protocol = *data++;
325         ntf.rf_tech_and_mode = *data++;
326         ntf.rf_tech_specific_params_len = *data++;
327 
328         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
329         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
330         pr_debug("rf_tech_and_mode 0x%x\n", ntf.rf_tech_and_mode);
331         pr_debug("rf_tech_specific_params_len %d\n",
332                  ntf.rf_tech_specific_params_len);
333 
334         if (ntf.rf_tech_specific_params_len > 0) {
335                 switch (ntf.rf_tech_and_mode) {
336                 case NCI_NFC_A_PASSIVE_POLL_MODE:
337                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
338                                 &(ntf.rf_tech_specific_params.nfca_poll), data);
339                         break;
340 
341                 case NCI_NFC_B_PASSIVE_POLL_MODE:
342                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
343                                 &(ntf.rf_tech_specific_params.nfcb_poll), data);
344                         break;
345 
346                 case NCI_NFC_F_PASSIVE_POLL_MODE:
347                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
348                                 &(ntf.rf_tech_specific_params.nfcf_poll), data);
349                         break;
350 
351                 case NCI_NFC_V_PASSIVE_POLL_MODE:
352                         data = nci_extract_rf_params_nfcv_passive_poll(ndev,
353                                 &(ntf.rf_tech_specific_params.nfcv_poll), data);
354                         break;
355 
356                 default:
357                         pr_err("unsupported rf_tech_and_mode 0x%x\n",
358                                ntf.rf_tech_and_mode);
359                         data += ntf.rf_tech_specific_params_len;
360                         add_target = false;
361                 }
362         }
363 
364         ntf.ntf_type = *data++;
365         pr_debug("ntf_type %d\n", ntf.ntf_type);
366 
367         if (add_target == true)
368                 nci_add_new_target(ndev, &ntf);
369 
370         if (ntf.ntf_type == NCI_DISCOVER_NTF_TYPE_MORE) {
371                 atomic_set(&ndev->state, NCI_W4_ALL_DISCOVERIES);
372         } else {
373                 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
374                 nfc_targets_found(ndev->nfc_dev, ndev->targets,
375                                   ndev->n_targets);
376         }
377 }
378 
379 static int nci_extract_activation_params_iso_dep(struct nci_dev *ndev,
380                         struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
381 {
382         struct activation_params_nfca_poll_iso_dep *nfca_poll;
383         struct activation_params_nfcb_poll_iso_dep *nfcb_poll;
384 
385         switch (ntf->activation_rf_tech_and_mode) {
386         case NCI_NFC_A_PASSIVE_POLL_MODE:
387                 nfca_poll = &ntf->activation_params.nfca_poll_iso_dep;
388                 nfca_poll->rats_res_len = min_t(__u8, *data++, 20);
389                 pr_debug("rats_res_len %d\n", nfca_poll->rats_res_len);
390                 if (nfca_poll->rats_res_len > 0) {
391                         memcpy(nfca_poll->rats_res,
392                                data, nfca_poll->rats_res_len);
393                 }
394                 break;
395 
396         case NCI_NFC_B_PASSIVE_POLL_MODE:
397                 nfcb_poll = &ntf->activation_params.nfcb_poll_iso_dep;
398                 nfcb_poll->attrib_res_len = min_t(__u8, *data++, 50);
399                 pr_debug("attrib_res_len %d\n", nfcb_poll->attrib_res_len);
400                 if (nfcb_poll->attrib_res_len > 0) {
401                         memcpy(nfcb_poll->attrib_res,
402                                data, nfcb_poll->attrib_res_len);
403                 }
404                 break;
405 
406         default:
407                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
408                        ntf->activation_rf_tech_and_mode);
409                 return NCI_STATUS_RF_PROTOCOL_ERROR;
410         }
411 
412         return NCI_STATUS_OK;
413 }
414 
415 static int nci_extract_activation_params_nfc_dep(struct nci_dev *ndev,
416                         struct nci_rf_intf_activated_ntf *ntf, __u8 *data)
417 {
418         struct activation_params_poll_nfc_dep *poll;
419         struct activation_params_listen_nfc_dep *listen;
420 
421         switch (ntf->activation_rf_tech_and_mode) {
422         case NCI_NFC_A_PASSIVE_POLL_MODE:
423         case NCI_NFC_F_PASSIVE_POLL_MODE:
424                 poll = &ntf->activation_params.poll_nfc_dep;
425                 poll->atr_res_len = min_t(__u8, *data++,
426                                           NFC_ATR_RES_MAXSIZE - 2);
427                 pr_debug("atr_res_len %d\n", poll->atr_res_len);
428                 if (poll->atr_res_len > 0)
429                         memcpy(poll->atr_res, data, poll->atr_res_len);
430                 break;
431 
432         case NCI_NFC_A_PASSIVE_LISTEN_MODE:
433         case NCI_NFC_F_PASSIVE_LISTEN_MODE:
434                 listen = &ntf->activation_params.listen_nfc_dep;
435                 listen->atr_req_len = min_t(__u8, *data++,
436                                             NFC_ATR_REQ_MAXSIZE - 2);
437                 pr_debug("atr_req_len %d\n", listen->atr_req_len);
438                 if (listen->atr_req_len > 0)
439                         memcpy(listen->atr_req, data, listen->atr_req_len);
440                 break;
441 
442         default:
443                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
444                        ntf->activation_rf_tech_and_mode);
445                 return NCI_STATUS_RF_PROTOCOL_ERROR;
446         }
447 
448         return NCI_STATUS_OK;
449 }
450 
451 static void nci_target_auto_activated(struct nci_dev *ndev,
452                                       struct nci_rf_intf_activated_ntf *ntf)
453 {
454         struct nfc_target *target;
455         int rc;
456 
457         target = &ndev->targets[ndev->n_targets];
458 
459         rc = nci_add_new_protocol(ndev, target, ntf->rf_protocol,
460                                   ntf->activation_rf_tech_and_mode,
461                                   &ntf->rf_tech_specific_params);
462         if (rc)
463                 return;
464 
465         target->logical_idx = ntf->rf_discovery_id;
466         ndev->n_targets++;
467 
468         pr_debug("logical idx %d, n_targets %d\n",
469                  target->logical_idx, ndev->n_targets);
470 
471         nfc_targets_found(ndev->nfc_dev, ndev->targets, ndev->n_targets);
472 }
473 
474 static int nci_store_general_bytes_nfc_dep(struct nci_dev *ndev,
475                 struct nci_rf_intf_activated_ntf *ntf)
476 {
477         ndev->remote_gb_len = 0;
478 
479         if (ntf->activation_params_len <= 0)
480                 return NCI_STATUS_OK;
481 
482         switch (ntf->activation_rf_tech_and_mode) {
483         case NCI_NFC_A_PASSIVE_POLL_MODE:
484         case NCI_NFC_F_PASSIVE_POLL_MODE:
485                 ndev->remote_gb_len = min_t(__u8,
486                         (ntf->activation_params.poll_nfc_dep.atr_res_len
487                                                 - NFC_ATR_RES_GT_OFFSET),
488                         NFC_ATR_RES_GB_MAXSIZE);
489                 memcpy(ndev->remote_gb,
490                        (ntf->activation_params.poll_nfc_dep.atr_res
491                                                 + NFC_ATR_RES_GT_OFFSET),
492                        ndev->remote_gb_len);
493                 break;
494 
495         case NCI_NFC_A_PASSIVE_LISTEN_MODE:
496         case NCI_NFC_F_PASSIVE_LISTEN_MODE:
497                 ndev->remote_gb_len = min_t(__u8,
498                         (ntf->activation_params.listen_nfc_dep.atr_req_len
499                                                 - NFC_ATR_REQ_GT_OFFSET),
500                         NFC_ATR_REQ_GB_MAXSIZE);
501                 memcpy(ndev->remote_gb,
502                        (ntf->activation_params.listen_nfc_dep.atr_req
503                                                 + NFC_ATR_REQ_GT_OFFSET),
504                        ndev->remote_gb_len);
505                 break;
506 
507         default:
508                 pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
509                        ntf->activation_rf_tech_and_mode);
510                 return NCI_STATUS_RF_PROTOCOL_ERROR;
511         }
512 
513         return NCI_STATUS_OK;
514 }
515 
516 static void nci_rf_intf_activated_ntf_packet(struct nci_dev *ndev,
517                                              struct sk_buff *skb)
518 {
519         struct nci_conn_info    *conn_info;
520         struct nci_rf_intf_activated_ntf ntf;
521         __u8 *data = skb->data;
522         int err = NCI_STATUS_OK;
523 
524         ntf.rf_discovery_id = *data++;
525         ntf.rf_interface = *data++;
526         ntf.rf_protocol = *data++;
527         ntf.activation_rf_tech_and_mode = *data++;
528         ntf.max_data_pkt_payload_size = *data++;
529         ntf.initial_num_credits = *data++;
530         ntf.rf_tech_specific_params_len = *data++;
531 
532         pr_debug("rf_discovery_id %d\n", ntf.rf_discovery_id);
533         pr_debug("rf_interface 0x%x\n", ntf.rf_interface);
534         pr_debug("rf_protocol 0x%x\n", ntf.rf_protocol);
535         pr_debug("activation_rf_tech_and_mode 0x%x\n",
536                  ntf.activation_rf_tech_and_mode);
537         pr_debug("max_data_pkt_payload_size 0x%x\n",
538                  ntf.max_data_pkt_payload_size);
539         pr_debug("initial_num_credits 0x%x\n",
540                  ntf.initial_num_credits);
541         pr_debug("rf_tech_specific_params_len %d\n",
542                  ntf.rf_tech_specific_params_len);
543 
544         /* If this contains a value of 0x00 (NFCEE Direct RF
545          * Interface) then all following parameters SHALL contain a
546          * value of 0 and SHALL be ignored.
547          */
548         if (ntf.rf_interface == NCI_RF_INTERFACE_NFCEE_DIRECT)
549                 goto listen;
550 
551         if (ntf.rf_tech_specific_params_len > 0) {
552                 switch (ntf.activation_rf_tech_and_mode) {
553                 case NCI_NFC_A_PASSIVE_POLL_MODE:
554                         data = nci_extract_rf_params_nfca_passive_poll(ndev,
555                                 &(ntf.rf_tech_specific_params.nfca_poll), data);
556                         break;
557 
558                 case NCI_NFC_B_PASSIVE_POLL_MODE:
559                         data = nci_extract_rf_params_nfcb_passive_poll(ndev,
560                                 &(ntf.rf_tech_specific_params.nfcb_poll), data);
561                         break;
562 
563                 case NCI_NFC_F_PASSIVE_POLL_MODE:
564                         data = nci_extract_rf_params_nfcf_passive_poll(ndev,
565                                 &(ntf.rf_tech_specific_params.nfcf_poll), data);
566                         break;
567 
568                 case NCI_NFC_V_PASSIVE_POLL_MODE:
569                         data = nci_extract_rf_params_nfcv_passive_poll(ndev,
570                                 &(ntf.rf_tech_specific_params.nfcv_poll), data);
571                         break;
572 
573                 case NCI_NFC_A_PASSIVE_LISTEN_MODE:
574                         /* no RF technology specific parameters */
575                         break;
576 
577                 case NCI_NFC_F_PASSIVE_LISTEN_MODE:
578                         data = nci_extract_rf_params_nfcf_passive_listen(ndev,
579                                 &(ntf.rf_tech_specific_params.nfcf_listen),
580                                 data);
581                         break;
582 
583                 default:
584                         pr_err("unsupported activation_rf_tech_and_mode 0x%x\n",
585                                ntf.activation_rf_tech_and_mode);
586                         err = NCI_STATUS_RF_PROTOCOL_ERROR;
587                         goto exit;
588                 }
589         }
590 
591         ntf.data_exch_rf_tech_and_mode = *data++;
592         ntf.data_exch_tx_bit_rate = *data++;
593         ntf.data_exch_rx_bit_rate = *data++;
594         ntf.activation_params_len = *data++;
595 
596         pr_debug("data_exch_rf_tech_and_mode 0x%x\n",
597                  ntf.data_exch_rf_tech_and_mode);
598         pr_debug("data_exch_tx_bit_rate 0x%x\n", ntf.data_exch_tx_bit_rate);
599         pr_debug("data_exch_rx_bit_rate 0x%x\n", ntf.data_exch_rx_bit_rate);
600         pr_debug("activation_params_len %d\n", ntf.activation_params_len);
601 
602         if (ntf.activation_params_len > 0) {
603                 switch (ntf.rf_interface) {
604                 case NCI_RF_INTERFACE_ISO_DEP:
605                         err = nci_extract_activation_params_iso_dep(ndev,
606                                                                     &ntf, data);
607                         break;
608 
609                 case NCI_RF_INTERFACE_NFC_DEP:
610                         err = nci_extract_activation_params_nfc_dep(ndev,
611                                                                     &ntf, data);
612                         break;
613 
614                 case NCI_RF_INTERFACE_FRAME:
615                         /* no activation params */
616                         break;
617 
618                 default:
619                         pr_err("unsupported rf_interface 0x%x\n",
620                                ntf.rf_interface);
621                         err = NCI_STATUS_RF_PROTOCOL_ERROR;
622                         break;
623                 }
624         }
625 
626 exit:
627         if (err == NCI_STATUS_OK) {
628                 conn_info = ndev->rf_conn_info;
629                 if (!conn_info)
630                         return;
631 
632                 conn_info->max_pkt_payload_len = ntf.max_data_pkt_payload_size;
633                 conn_info->initial_num_credits = ntf.initial_num_credits;
634 
635                 /* set the available credits to initial value */
636                 atomic_set(&conn_info->credits_cnt,
637                            conn_info->initial_num_credits);
638 
639                 /* store general bytes to be reported later in dep_link_up */
640                 if (ntf.rf_interface == NCI_RF_INTERFACE_NFC_DEP) {
641                         err = nci_store_general_bytes_nfc_dep(ndev, &ntf);
642                         if (err != NCI_STATUS_OK)
643                                 pr_err("unable to store general bytes\n");
644                 }
645         }
646 
647         if (!(ntf.activation_rf_tech_and_mode & NCI_RF_TECH_MODE_LISTEN_MASK)) {
648                 /* Poll mode */
649                 if (atomic_read(&ndev->state) == NCI_DISCOVERY) {
650                         /* A single target was found and activated
651                          * automatically */
652                         atomic_set(&ndev->state, NCI_POLL_ACTIVE);
653                         if (err == NCI_STATUS_OK)
654                                 nci_target_auto_activated(ndev, &ntf);
655                 } else {        /* ndev->state == NCI_W4_HOST_SELECT */
656                         /* A selected target was activated, so complete the
657                          * request */
658                         atomic_set(&ndev->state, NCI_POLL_ACTIVE);
659                         nci_req_complete(ndev, err);
660                 }
661         } else {
662 listen:
663                 /* Listen mode */
664                 atomic_set(&ndev->state, NCI_LISTEN_ACTIVE);
665                 if (err == NCI_STATUS_OK &&
666                     ntf.rf_protocol == NCI_RF_PROTOCOL_NFC_DEP) {
667                         err = nfc_tm_activated(ndev->nfc_dev,
668                                                NFC_PROTO_NFC_DEP_MASK,
669                                                NFC_COMM_PASSIVE,
670                                                ndev->remote_gb,
671                                                ndev->remote_gb_len);
672                         if (err != NCI_STATUS_OK)
673                                 pr_err("error when signaling tm activation\n");
674                 }
675         }
676 }
677 
678 static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
679                                          struct sk_buff *skb)
680 {
681         struct nci_conn_info    *conn_info;
682         struct nci_rf_deactivate_ntf *ntf = (void *) skb->data;
683 
684         pr_debug("entry, type 0x%x, reason 0x%x\n", ntf->type, ntf->reason);
685 
686         conn_info = ndev->rf_conn_info;
687         if (!conn_info)
688                 return;
689 
690         /* drop tx data queue */
691         skb_queue_purge(&ndev->tx_q);
692 
693         /* drop partial rx data packet */
694         if (ndev->rx_data_reassembly) {
695                 kfree_skb(ndev->rx_data_reassembly);
696                 ndev->rx_data_reassembly = NULL;
697         }
698 
699         /* complete the data exchange transaction, if exists */
700         if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
701                 nci_data_exchange_complete(ndev, NULL, NCI_STATIC_RF_CONN_ID,
702                                            -EIO);
703 
704         switch (ntf->type) {
705         case NCI_DEACTIVATE_TYPE_IDLE_MODE:
706                 nci_clear_target_list(ndev);
707                 atomic_set(&ndev->state, NCI_IDLE);
708                 break;
709         case NCI_DEACTIVATE_TYPE_SLEEP_MODE:
710         case NCI_DEACTIVATE_TYPE_SLEEP_AF_MODE:
711                 atomic_set(&ndev->state, NCI_W4_HOST_SELECT);
712                 break;
713         case NCI_DEACTIVATE_TYPE_DISCOVERY:
714                 nci_clear_target_list(ndev);
715                 atomic_set(&ndev->state, NCI_DISCOVERY);
716                 break;
717         }
718 
719         nci_req_complete(ndev, NCI_STATUS_OK);
720 }
721 
722 static void nci_nfcee_discover_ntf_packet(struct nci_dev *ndev,
723                                           struct sk_buff *skb)
724 {
725         u8 status = NCI_STATUS_OK;
726         struct nci_nfcee_discover_ntf   *nfcee_ntf =
727                                 (struct nci_nfcee_discover_ntf *)skb->data;
728 
729         pr_debug("\n");
730 
731         /* NFCForum NCI 9.2.1 HCI Network Specific Handling
732          * If the NFCC supports the HCI Network, it SHALL return one,
733          * and only one, NFCEE_DISCOVER_NTF with a Protocol type of
734          * “HCI Access”, even if the HCI Network contains multiple NFCEEs.
735          */
736         ndev->hci_dev->nfcee_id = nfcee_ntf->nfcee_id;
737         ndev->cur_params.id = nfcee_ntf->nfcee_id;
738 
739         nci_req_complete(ndev, status);
740 }
741 
742 static void nci_nfcee_action_ntf_packet(struct nci_dev *ndev,
743                                         struct sk_buff *skb)
744 {
745         pr_debug("\n");
746 }
747 
748 void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
749 {
750         __u16 ntf_opcode = nci_opcode(skb->data);
751 
752         pr_debug("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
753                  nci_pbf(skb->data),
754                  nci_opcode_gid(ntf_opcode),
755                  nci_opcode_oid(ntf_opcode),
756                  nci_plen(skb->data));
757 
758         /* strip the nci control header */
759         skb_pull(skb, NCI_CTRL_HDR_SIZE);
760 
761         if (nci_opcode_gid(ntf_opcode) == NCI_GID_PROPRIETARY) {
762                 if (nci_prop_ntf_packet(ndev, ntf_opcode, skb) == -ENOTSUPP) {
763                         pr_err("unsupported ntf opcode 0x%x\n",
764                                ntf_opcode);
765                 }
766 
767                 goto end;
768         }
769 
770         switch (ntf_opcode) {
771         case NCI_OP_CORE_CONN_CREDITS_NTF:
772                 nci_core_conn_credits_ntf_packet(ndev, skb);
773                 break;
774 
775         case NCI_OP_CORE_GENERIC_ERROR_NTF:
776                 nci_core_generic_error_ntf_packet(ndev, skb);
777                 break;
778 
779         case NCI_OP_CORE_INTF_ERROR_NTF:
780                 nci_core_conn_intf_error_ntf_packet(ndev, skb);
781                 break;
782 
783         case NCI_OP_RF_DISCOVER_NTF:
784                 nci_rf_discover_ntf_packet(ndev, skb);
785                 break;
786 
787         case NCI_OP_RF_INTF_ACTIVATED_NTF:
788                 nci_rf_intf_activated_ntf_packet(ndev, skb);
789                 break;
790 
791         case NCI_OP_RF_DEACTIVATE_NTF:
792                 nci_rf_deactivate_ntf_packet(ndev, skb);
793                 break;
794 
795         case NCI_OP_NFCEE_DISCOVER_NTF:
796                 nci_nfcee_discover_ntf_packet(ndev, skb);
797                 break;
798 
799         case NCI_OP_RF_NFCEE_ACTION_NTF:
800                 nci_nfcee_action_ntf_packet(ndev, skb);
801                 break;
802 
803         default:
804                 pr_err("unknown ntf opcode 0x%x\n", ntf_opcode);
805                 break;
806         }
807 
808         nci_core_ntf_packet(ndev, ntf_opcode, skb);
809 end:
810         kfree_skb(skb);
811 }
812 

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