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TOMOYO Linux Cross Reference
Linux/net/nfc/hci/core.c

Version: ~ [ linux-5.7 ] ~ [ linux-5.6.15 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.43 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.125 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.182 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.225 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.225 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.84 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /*
  2  * Copyright (C) 2012  Intel Corporation. All rights reserved.
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License as published by
  6  * the Free Software Foundation; either version 2 of the License, or
  7  * (at your option) any later version.
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 12  * GNU General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, write to the
 16  * Free Software Foundation, Inc.,
 17  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 18  */
 19 
 20 #define pr_fmt(fmt) "hci: %s: " fmt, __func__
 21 
 22 #include <linux/init.h>
 23 #include <linux/kernel.h>
 24 #include <linux/module.h>
 25 #include <linux/nfc.h>
 26 
 27 #include <net/nfc/nfc.h>
 28 #include <net/nfc/hci.h>
 29 #include <net/nfc/llc.h>
 30 
 31 #include "hci.h"
 32 
 33 /* Largest headroom needed for outgoing HCI commands */
 34 #define HCI_CMDS_HEADROOM 1
 35 
 36 int nfc_hci_result_to_errno(u8 result)
 37 {
 38         switch (result) {
 39         case NFC_HCI_ANY_OK:
 40                 return 0;
 41         case NFC_HCI_ANY_E_REG_PAR_UNKNOWN:
 42                 return -EOPNOTSUPP;
 43         case NFC_HCI_ANY_E_TIMEOUT:
 44                 return -ETIME;
 45         default:
 46                 return -1;
 47         }
 48 }
 49 EXPORT_SYMBOL(nfc_hci_result_to_errno);
 50 
 51 static void nfc_hci_msg_tx_work(struct work_struct *work)
 52 {
 53         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
 54                                                 msg_tx_work);
 55         struct hci_msg *msg;
 56         struct sk_buff *skb;
 57         int r = 0;
 58 
 59         mutex_lock(&hdev->msg_tx_mutex);
 60         if (hdev->shutting_down)
 61                 goto exit;
 62 
 63         if (hdev->cmd_pending_msg) {
 64                 if (timer_pending(&hdev->cmd_timer) == 0) {
 65                         if (hdev->cmd_pending_msg->cb)
 66                                 hdev->cmd_pending_msg->cb(hdev->
 67                                                           cmd_pending_msg->
 68                                                           cb_context,
 69                                                           NULL,
 70                                                           -ETIME);
 71                         kfree(hdev->cmd_pending_msg);
 72                         hdev->cmd_pending_msg = NULL;
 73                 } else {
 74                         goto exit;
 75                 }
 76         }
 77 
 78 next_msg:
 79         if (list_empty(&hdev->msg_tx_queue))
 80                 goto exit;
 81 
 82         msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
 83         list_del(&msg->msg_l);
 84 
 85         pr_debug("msg_tx_queue has a cmd to send\n");
 86         while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
 87                 r = nfc_llc_xmit_from_hci(hdev->llc, skb);
 88                 if (r < 0) {
 89                         kfree_skb(skb);
 90                         skb_queue_purge(&msg->msg_frags);
 91                         if (msg->cb)
 92                                 msg->cb(msg->cb_context, NULL, r);
 93                         kfree(msg);
 94                         break;
 95                 }
 96         }
 97 
 98         if (r)
 99                 goto next_msg;
100 
101         if (msg->wait_response == false) {
102                 kfree(msg);
103                 goto next_msg;
104         }
105 
106         hdev->cmd_pending_msg = msg;
107         mod_timer(&hdev->cmd_timer, jiffies +
108                   msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
109 
110 exit:
111         mutex_unlock(&hdev->msg_tx_mutex);
112 }
113 
114 static void nfc_hci_msg_rx_work(struct work_struct *work)
115 {
116         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
117                                                 msg_rx_work);
118         struct sk_buff *skb;
119         struct hcp_message *message;
120         u8 pipe;
121         u8 type;
122         u8 instruction;
123 
124         while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
125                 pipe = skb->data[0];
126                 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
127                 message = (struct hcp_message *)skb->data;
128                 type = HCP_MSG_GET_TYPE(message->header);
129                 instruction = HCP_MSG_GET_CMD(message->header);
130                 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
131 
132                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
133         }
134 }
135 
136 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
137                                      struct sk_buff *skb)
138 {
139         del_timer_sync(&hdev->cmd_timer);
140 
141         if (hdev->cmd_pending_msg->cb)
142                 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
143                                           skb, err);
144         else
145                 kfree_skb(skb);
146 
147         kfree(hdev->cmd_pending_msg);
148         hdev->cmd_pending_msg = NULL;
149 
150         schedule_work(&hdev->msg_tx_work);
151 }
152 
153 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
154                            struct sk_buff *skb)
155 {
156         mutex_lock(&hdev->msg_tx_mutex);
157 
158         if (hdev->cmd_pending_msg == NULL) {
159                 kfree_skb(skb);
160                 goto exit;
161         }
162 
163         __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
164 
165 exit:
166         mutex_unlock(&hdev->msg_tx_mutex);
167 }
168 
169 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
170                           struct sk_buff *skb)
171 {
172         kfree_skb(skb);
173 }
174 
175 u32 nfc_hci_sak_to_protocol(u8 sak)
176 {
177         switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
178         case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
179                 return NFC_PROTO_MIFARE_MASK;
180         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
181                 return NFC_PROTO_ISO14443_MASK;
182         case NFC_HCI_TYPE_A_SEL_PROT_DEP:
183                 return NFC_PROTO_NFC_DEP_MASK;
184         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
185                 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
186         default:
187                 return 0xffffffff;
188         }
189 }
190 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
191 
192 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
193 {
194         struct nfc_target *targets;
195         struct sk_buff *atqa_skb = NULL;
196         struct sk_buff *sak_skb = NULL;
197         struct sk_buff *uid_skb = NULL;
198         int r;
199 
200         pr_debug("from gate %d\n", gate);
201 
202         targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
203         if (targets == NULL)
204                 return -ENOMEM;
205 
206         switch (gate) {
207         case NFC_HCI_RF_READER_A_GATE:
208                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
209                                       NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
210                 if (r < 0)
211                         goto exit;
212 
213                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
214                                       NFC_HCI_RF_READER_A_SAK, &sak_skb);
215                 if (r < 0)
216                         goto exit;
217 
218                 if (atqa_skb->len != 2 || sak_skb->len != 1) {
219                         r = -EPROTO;
220                         goto exit;
221                 }
222 
223                 targets->supported_protocols =
224                                 nfc_hci_sak_to_protocol(sak_skb->data[0]);
225                 if (targets->supported_protocols == 0xffffffff) {
226                         r = -EPROTO;
227                         goto exit;
228                 }
229 
230                 targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
231                 targets->sel_res = sak_skb->data[0];
232 
233                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
234                                       NFC_HCI_RF_READER_A_UID, &uid_skb);
235                 if (r < 0)
236                         goto exit;
237 
238                 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
239                         r = -EPROTO;
240                         goto exit;
241                 }
242 
243                 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
244                 targets->nfcid1_len = uid_skb->len;
245 
246                 if (hdev->ops->complete_target_discovered) {
247                         r = hdev->ops->complete_target_discovered(hdev, gate,
248                                                                   targets);
249                         if (r < 0)
250                                 goto exit;
251                 }
252                 break;
253         case NFC_HCI_RF_READER_B_GATE:
254                 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
255                 break;
256         default:
257                 if (hdev->ops->target_from_gate)
258                         r = hdev->ops->target_from_gate(hdev, gate, targets);
259                 else
260                         r = -EPROTO;
261                 if (r < 0)
262                         goto exit;
263 
264                 if (hdev->ops->complete_target_discovered) {
265                         r = hdev->ops->complete_target_discovered(hdev, gate,
266                                                                   targets);
267                         if (r < 0)
268                                 goto exit;
269                 }
270                 break;
271         }
272 
273         /* if driver set the new gate, we will skip the old one */
274         if (targets->hci_reader_gate == 0x00)
275                 targets->hci_reader_gate = gate;
276 
277         r = nfc_targets_found(hdev->ndev, targets, 1);
278 
279 exit:
280         kfree(targets);
281         kfree_skb(atqa_skb);
282         kfree_skb(sak_skb);
283         kfree_skb(uid_skb);
284 
285         return r;
286 }
287 EXPORT_SYMBOL(nfc_hci_target_discovered);
288 
289 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
290                             struct sk_buff *skb)
291 {
292         int r = 0;
293         u8 gate = nfc_hci_pipe2gate(hdev, pipe);
294 
295         if (gate == 0xff) {
296                 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
297                 goto exit;
298         }
299 
300         if (hdev->ops->event_received) {
301                 r = hdev->ops->event_received(hdev, gate, event, skb);
302                 if (r <= 0)
303                         goto exit_noskb;
304         }
305 
306         switch (event) {
307         case NFC_HCI_EVT_TARGET_DISCOVERED:
308                 if (skb->len < 1) {     /* no status data? */
309                         r = -EPROTO;
310                         goto exit;
311                 }
312 
313                 if (skb->data[0] == 3) {
314                         /* TODO: Multiple targets in field, none activated
315                          * poll is supposedly stopped, but there is no
316                          * single target to activate, so nothing to report
317                          * up.
318                          * if we need to restart poll, we must save the
319                          * protocols from the initial poll and reuse here.
320                          */
321                 }
322 
323                 if (skb->data[0] != 0) {
324                         r = -EPROTO;
325                         goto exit;
326                 }
327 
328                 r = nfc_hci_target_discovered(hdev, gate);
329                 break;
330         default:
331                 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
332                 r = -EINVAL;
333                 break;
334         }
335 
336 exit:
337         kfree_skb(skb);
338 
339 exit_noskb:
340         if (r) {
341                 /* TODO: There was an error dispatching the event,
342                  * how to propagate up to nfc core?
343                  */
344         }
345 }
346 
347 static void nfc_hci_cmd_timeout(unsigned long data)
348 {
349         struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
350 
351         schedule_work(&hdev->msg_tx_work);
352 }
353 
354 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
355                                  struct nfc_hci_gate *gates)
356 {
357         int r;
358         while (gate_count--) {
359                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
360                                          gates->gate, gates->pipe);
361                 if (r < 0)
362                         return r;
363                 gates++;
364         }
365 
366         return 0;
367 }
368 
369 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
370 {
371         struct sk_buff *skb = NULL;
372         int r;
373 
374         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
375                 return -EPROTO;
376 
377         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
378                                  hdev->init_data.gates[0].gate,
379                                  hdev->init_data.gates[0].pipe);
380         if (r < 0)
381                 goto exit;
382 
383         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
384                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
385         if (r < 0)
386                 goto disconnect_all;
387 
388         if (skb->len && skb->len == strlen(hdev->init_data.session_id))
389                 if (memcmp(hdev->init_data.session_id, skb->data,
390                            skb->len) == 0) {
391                         /* TODO ELa: restore gate<->pipe table from
392                          * some TBD location.
393                          * note: it doesn't seem possible to get the chip
394                          * currently open gate/pipe table.
395                          * It is only possible to obtain the supported
396                          * gate list.
397                          */
398 
399                         /* goto exit
400                          * For now, always do a full initialization */
401                 }
402 
403         r = nfc_hci_disconnect_all_gates(hdev);
404         if (r < 0)
405                 goto exit;
406 
407         r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
408                                   hdev->init_data.gates);
409         if (r < 0)
410                 goto disconnect_all;
411 
412         r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
413                               NFC_HCI_ADMIN_SESSION_IDENTITY,
414                               hdev->init_data.session_id,
415                               strlen(hdev->init_data.session_id));
416         if (r == 0)
417                 goto exit;
418 
419 disconnect_all:
420         nfc_hci_disconnect_all_gates(hdev);
421 
422 exit:
423         kfree_skb(skb);
424 
425         return r;
426 }
427 
428 static int hci_dev_version(struct nfc_hci_dev *hdev)
429 {
430         int r;
431         struct sk_buff *skb;
432 
433         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
434                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
435         if (r == -EOPNOTSUPP) {
436                 pr_info("Software/Hardware info not available\n");
437                 return 0;
438         }
439         if (r < 0)
440                 return r;
441 
442         if (skb->len != 3) {
443                 kfree_skb(skb);
444                 return -EINVAL;
445         }
446 
447         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
448         hdev->sw_patch = skb->data[0] & 0x0f;
449         hdev->sw_flashlib_major = skb->data[1];
450         hdev->sw_flashlib_minor = skb->data[2];
451 
452         kfree_skb(skb);
453 
454         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
455                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
456         if (r < 0)
457                 return r;
458 
459         if (skb->len != 3) {
460                 kfree_skb(skb);
461                 return -EINVAL;
462         }
463 
464         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
465         hdev->hw_version = skb->data[0] & 0x1f;
466         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
467         hdev->hw_software = skb->data[1] & 0x3f;
468         hdev->hw_bsid = skb->data[2];
469 
470         kfree_skb(skb);
471 
472         pr_info("SOFTWARE INFO:\n");
473         pr_info("RomLib         : %d\n", hdev->sw_romlib);
474         pr_info("Patch          : %d\n", hdev->sw_patch);
475         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
476         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
477         pr_info("HARDWARE INFO:\n");
478         pr_info("Derivative     : %d\n", hdev->hw_derivative);
479         pr_info("HW Version     : %d\n", hdev->hw_version);
480         pr_info("#MPW           : %d\n", hdev->hw_mpw);
481         pr_info("Software       : %d\n", hdev->hw_software);
482         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
483 
484         return 0;
485 }
486 
487 static int hci_dev_up(struct nfc_dev *nfc_dev)
488 {
489         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
490         int r = 0;
491 
492         if (hdev->ops->open) {
493                 r = hdev->ops->open(hdev);
494                 if (r < 0)
495                         return r;
496         }
497 
498         r = nfc_llc_start(hdev->llc);
499         if (r < 0)
500                 goto exit_close;
501 
502         r = hci_dev_session_init(hdev);
503         if (r < 0)
504                 goto exit_llc;
505 
506         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
507                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
508         if (r < 0)
509                 goto exit_llc;
510 
511         if (hdev->ops->hci_ready) {
512                 r = hdev->ops->hci_ready(hdev);
513                 if (r < 0)
514                         goto exit_llc;
515         }
516 
517         r = hci_dev_version(hdev);
518         if (r < 0)
519                 goto exit_llc;
520 
521         return 0;
522 
523 exit_llc:
524         nfc_llc_stop(hdev->llc);
525 
526 exit_close:
527         if (hdev->ops->close)
528                 hdev->ops->close(hdev);
529 
530         return r;
531 }
532 
533 static int hci_dev_down(struct nfc_dev *nfc_dev)
534 {
535         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
536 
537         nfc_llc_stop(hdev->llc);
538 
539         if (hdev->ops->close)
540                 hdev->ops->close(hdev);
541 
542         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
543 
544         return 0;
545 }
546 
547 static int hci_start_poll(struct nfc_dev *nfc_dev,
548                           u32 im_protocols, u32 tm_protocols)
549 {
550         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
551 
552         if (hdev->ops->start_poll)
553                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
554         else
555                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
556                                           NFC_HCI_EVT_READER_REQUESTED,
557                                           NULL, 0);
558 }
559 
560 static void hci_stop_poll(struct nfc_dev *nfc_dev)
561 {
562         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
563 
564         nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
565                            NFC_HCI_EVT_END_OPERATION, NULL, 0);
566 }
567 
568 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
569                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
570 {
571         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
572 
573         if (!hdev->ops->dep_link_up)
574                 return 0;
575 
576         return hdev->ops->dep_link_up(hdev, target, comm_mode,
577                                       gb, gb_len);
578 }
579 
580 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
581 {
582         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
583 
584         if (!hdev->ops->dep_link_down)
585                 return 0;
586 
587         return hdev->ops->dep_link_down(hdev);
588 }
589 
590 static int hci_activate_target(struct nfc_dev *nfc_dev,
591                                struct nfc_target *target, u32 protocol)
592 {
593         return 0;
594 }
595 
596 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
597                                   struct nfc_target *target)
598 {
599 }
600 
601 #define HCI_CB_TYPE_TRANSCEIVE 1
602 
603 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
604 {
605         struct nfc_hci_dev *hdev = context;
606 
607         switch (hdev->async_cb_type) {
608         case HCI_CB_TYPE_TRANSCEIVE:
609                 /*
610                  * TODO: Check RF Error indicator to make sure data is valid.
611                  * It seems that HCI cmd can complete without error, but data
612                  * can be invalid if an RF error occured? Ignore for now.
613                  */
614                 if (err == 0)
615                         skb_trim(skb, skb->len - 1); /* RF Err ind */
616 
617                 hdev->async_cb(hdev->async_cb_context, skb, err);
618                 break;
619         default:
620                 if (err == 0)
621                         kfree_skb(skb);
622                 break;
623         }
624 }
625 
626 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
627                           struct sk_buff *skb, data_exchange_cb_t cb,
628                           void *cb_context)
629 {
630         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
631         int r;
632 
633         pr_debug("target_idx=%d\n", target->idx);
634 
635         switch (target->hci_reader_gate) {
636         case NFC_HCI_RF_READER_A_GATE:
637         case NFC_HCI_RF_READER_B_GATE:
638                 if (hdev->ops->im_transceive) {
639                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
640                                                      cb_context);
641                         if (r <= 0)     /* handled */
642                                 break;
643                 }
644 
645                 *skb_push(skb, 1) = 0;  /* CTR, see spec:10.2.2.1 */
646 
647                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
648                 hdev->async_cb = cb;
649                 hdev->async_cb_context = cb_context;
650 
651                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
652                                            NFC_HCI_WR_XCHG_DATA, skb->data,
653                                            skb->len, hci_transceive_cb, hdev);
654                 break;
655         default:
656                 if (hdev->ops->im_transceive) {
657                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
658                                                      cb_context);
659                         if (r == 1)
660                                 r = -ENOTSUPP;
661                 } else {
662                         r = -ENOTSUPP;
663                 }
664                 break;
665         }
666 
667         kfree_skb(skb);
668 
669         return r;
670 }
671 
672 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
673 {
674         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
675 
676         if (!hdev->ops->tm_send) {
677                 kfree_skb(skb);
678                 return -ENOTSUPP;
679         }
680 
681         return hdev->ops->tm_send(hdev, skb);
682 }
683 
684 static int hci_check_presence(struct nfc_dev *nfc_dev,
685                               struct nfc_target *target)
686 {
687         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
688 
689         if (!hdev->ops->check_presence)
690                 return 0;
691 
692         return hdev->ops->check_presence(hdev, target);
693 }
694 
695 static int hci_discover_se(struct nfc_dev *nfc_dev)
696 {
697         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
698 
699         if (hdev->ops->discover_se)
700                 return hdev->ops->discover_se(hdev);
701 
702         return 0;
703 }
704 
705 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
706 {
707         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
708 
709         if (hdev->ops->enable_se)
710                 return hdev->ops->enable_se(hdev, se_idx);
711 
712         return 0;
713 }
714 
715 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
716 {
717         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
718 
719         if (hdev->ops->disable_se)
720                 return hdev->ops->enable_se(hdev, se_idx);
721 
722         return 0;
723 }
724 
725 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
726 {
727         mutex_lock(&hdev->msg_tx_mutex);
728 
729         if (hdev->cmd_pending_msg == NULL) {
730                 nfc_driver_failure(hdev->ndev, err);
731                 goto exit;
732         }
733 
734         __nfc_hci_cmd_completion(hdev, err, NULL);
735 
736 exit:
737         mutex_unlock(&hdev->msg_tx_mutex);
738 }
739 
740 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
741 {
742         nfc_hci_failure(hdev, err);
743 }
744 
745 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
746 {
747         struct hcp_packet *packet;
748         u8 type;
749         u8 instruction;
750         struct sk_buff *hcp_skb;
751         u8 pipe;
752         struct sk_buff *frag_skb;
753         int msg_len;
754 
755         packet = (struct hcp_packet *)skb->data;
756         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
757                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
758                 return;
759         }
760 
761         /* it's the last fragment. Does it need re-aggregation? */
762         if (skb_queue_len(&hdev->rx_hcp_frags)) {
763                 pipe = packet->header & NFC_HCI_FRAGMENT;
764                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
765 
766                 msg_len = 0;
767                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
768                         msg_len += (frag_skb->len -
769                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
770                 }
771 
772                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
773                                              msg_len, GFP_KERNEL);
774                 if (hcp_skb == NULL) {
775                         nfc_hci_failure(hdev, -ENOMEM);
776                         return;
777                 }
778 
779                 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
780 
781                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
782                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
783                         memcpy(skb_put(hcp_skb, msg_len),
784                                frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
785                                msg_len);
786                 }
787 
788                 skb_queue_purge(&hdev->rx_hcp_frags);
789         } else {
790                 packet->header &= NFC_HCI_FRAGMENT;
791                 hcp_skb = skb;
792         }
793 
794         /* if this is a response, dispatch immediately to
795          * unblock waiting cmd context. Otherwise, enqueue to dispatch
796          * in separate context where handler can also execute command.
797          */
798         packet = (struct hcp_packet *)hcp_skb->data;
799         type = HCP_MSG_GET_TYPE(packet->message.header);
800         if (type == NFC_HCI_HCP_RESPONSE) {
801                 pipe = packet->header;
802                 instruction = HCP_MSG_GET_CMD(packet->message.header);
803                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
804                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
805                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
806         } else {
807                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
808                 schedule_work(&hdev->msg_rx_work);
809         }
810 }
811 
812 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
813 {
814         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
815 
816         if (!hdev->ops->fw_download)
817                 return -ENOTSUPP;
818 
819         return hdev->ops->fw_download(hdev, firmware_name);
820 }
821 
822 static struct nfc_ops hci_nfc_ops = {
823         .dev_up = hci_dev_up,
824         .dev_down = hci_dev_down,
825         .start_poll = hci_start_poll,
826         .stop_poll = hci_stop_poll,
827         .dep_link_up = hci_dep_link_up,
828         .dep_link_down = hci_dep_link_down,
829         .activate_target = hci_activate_target,
830         .deactivate_target = hci_deactivate_target,
831         .im_transceive = hci_transceive,
832         .tm_send = hci_tm_send,
833         .check_presence = hci_check_presence,
834         .fw_download = hci_fw_download,
835         .discover_se = hci_discover_se,
836         .enable_se = hci_enable_se,
837         .disable_se = hci_disable_se,
838 };
839 
840 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
841                                             struct nfc_hci_init_data *init_data,
842                                             unsigned long quirks,
843                                             u32 protocols,
844                                             const char *llc_name,
845                                             int tx_headroom,
846                                             int tx_tailroom,
847                                             int max_link_payload)
848 {
849         struct nfc_hci_dev *hdev;
850 
851         if (ops->xmit == NULL)
852                 return NULL;
853 
854         if (protocols == 0)
855                 return NULL;
856 
857         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
858         if (hdev == NULL)
859                 return NULL;
860 
861         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
862                                      nfc_hci_recv_from_llc, tx_headroom,
863                                      tx_tailroom, nfc_hci_llc_failure);
864         if (hdev->llc == NULL) {
865                 kfree(hdev);
866                 return NULL;
867         }
868 
869         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
870                                          tx_headroom + HCI_CMDS_HEADROOM,
871                                          tx_tailroom);
872         if (!hdev->ndev) {
873                 nfc_llc_free(hdev->llc);
874                 kfree(hdev);
875                 return NULL;
876         }
877 
878         hdev->ops = ops;
879         hdev->max_data_link_payload = max_link_payload;
880         hdev->init_data = *init_data;
881 
882         nfc_set_drvdata(hdev->ndev, hdev);
883 
884         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
885 
886         hdev->quirks = quirks;
887 
888         return hdev;
889 }
890 EXPORT_SYMBOL(nfc_hci_allocate_device);
891 
892 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
893 {
894         nfc_free_device(hdev->ndev);
895         nfc_llc_free(hdev->llc);
896         kfree(hdev);
897 }
898 EXPORT_SYMBOL(nfc_hci_free_device);
899 
900 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
901 {
902         mutex_init(&hdev->msg_tx_mutex);
903 
904         INIT_LIST_HEAD(&hdev->msg_tx_queue);
905 
906         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
907 
908         init_timer(&hdev->cmd_timer);
909         hdev->cmd_timer.data = (unsigned long)hdev;
910         hdev->cmd_timer.function = nfc_hci_cmd_timeout;
911 
912         skb_queue_head_init(&hdev->rx_hcp_frags);
913 
914         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
915 
916         skb_queue_head_init(&hdev->msg_rx_queue);
917 
918         return nfc_register_device(hdev->ndev);
919 }
920 EXPORT_SYMBOL(nfc_hci_register_device);
921 
922 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
923 {
924         struct hci_msg *msg, *n;
925 
926         mutex_lock(&hdev->msg_tx_mutex);
927 
928         if (hdev->cmd_pending_msg) {
929                 if (hdev->cmd_pending_msg->cb)
930                         hdev->cmd_pending_msg->cb(
931                                              hdev->cmd_pending_msg->cb_context,
932                                              NULL, -ESHUTDOWN);
933                 kfree(hdev->cmd_pending_msg);
934                 hdev->cmd_pending_msg = NULL;
935         }
936 
937         hdev->shutting_down = true;
938 
939         mutex_unlock(&hdev->msg_tx_mutex);
940 
941         del_timer_sync(&hdev->cmd_timer);
942         cancel_work_sync(&hdev->msg_tx_work);
943 
944         cancel_work_sync(&hdev->msg_rx_work);
945 
946         nfc_unregister_device(hdev->ndev);
947 
948         skb_queue_purge(&hdev->rx_hcp_frags);
949         skb_queue_purge(&hdev->msg_rx_queue);
950 
951         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
952                 list_del(&msg->msg_l);
953                 skb_queue_purge(&msg->msg_frags);
954                 kfree(msg);
955         }
956 }
957 EXPORT_SYMBOL(nfc_hci_unregister_device);
958 
959 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
960 {
961         hdev->clientdata = clientdata;
962 }
963 EXPORT_SYMBOL(nfc_hci_set_clientdata);
964 
965 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
966 {
967         return hdev->clientdata;
968 }
969 EXPORT_SYMBOL(nfc_hci_get_clientdata);
970 
971 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
972 {
973         nfc_hci_failure(hdev, err);
974 }
975 EXPORT_SYMBOL(nfc_hci_driver_failure);
976 
977 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
978 {
979         nfc_llc_rcv_from_drv(hdev->llc, skb);
980 }
981 EXPORT_SYMBOL(nfc_hci_recv_frame);
982 
983 static int __init nfc_hci_init(void)
984 {
985         return nfc_llc_init();
986 }
987 
988 static void __exit nfc_hci_exit(void)
989 {
990         nfc_llc_exit();
991 }
992 
993 subsys_initcall(nfc_hci_init);
994 module_exit(nfc_hci_exit);
995 
996 MODULE_LICENSE("GPL");
997 MODULE_DESCRIPTION("NFC HCI Core");
998 

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