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core.c
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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 static 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_TIMEOUT:
42  return -ETIME;
43  default:
44  return -1;
45  }
46 }
47 
48 static void nfc_hci_msg_tx_work(struct work_struct *work)
49 {
50  struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
51  msg_tx_work);
52  struct hci_msg *msg;
53  struct sk_buff *skb;
54  int r = 0;
55 
56  mutex_lock(&hdev->msg_tx_mutex);
57 
58  if (hdev->cmd_pending_msg) {
59  if (timer_pending(&hdev->cmd_timer) == 0) {
60  if (hdev->cmd_pending_msg->cb)
61  hdev->cmd_pending_msg->cb(hdev->
62  cmd_pending_msg->
63  cb_context,
64  NULL,
65  -ETIME);
66  kfree(hdev->cmd_pending_msg);
67  hdev->cmd_pending_msg = NULL;
68  } else
69  goto exit;
70  }
71 
72 next_msg:
73  if (list_empty(&hdev->msg_tx_queue))
74  goto exit;
75 
76  msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
77  list_del(&msg->msg_l);
78 
79  pr_debug("msg_tx_queue has a cmd to send\n");
80  while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
81  r = nfc_llc_xmit_from_hci(hdev->llc, skb);
82  if (r < 0) {
83  kfree_skb(skb);
84  skb_queue_purge(&msg->msg_frags);
85  if (msg->cb)
86  msg->cb(msg->cb_context, NULL, r);
87  kfree(msg);
88  break;
89  }
90  }
91 
92  if (r)
93  goto next_msg;
94 
95  if (msg->wait_response == false) {
96  kfree(msg);
97  goto next_msg;
98  }
99 
100  hdev->cmd_pending_msg = msg;
101  mod_timer(&hdev->cmd_timer, jiffies +
102  msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
103 
104 exit:
105  mutex_unlock(&hdev->msg_tx_mutex);
106 }
107 
108 static void nfc_hci_msg_rx_work(struct work_struct *work)
109 {
110  struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
111  msg_rx_work);
112  struct sk_buff *skb;
113  struct hcp_message *message;
114  u8 pipe;
115  u8 type;
116  u8 instruction;
117 
118  while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
119  pipe = skb->data[0];
120  skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
121  message = (struct hcp_message *)skb->data;
122  type = HCP_MSG_GET_TYPE(message->header);
123  instruction = HCP_MSG_GET_CMD(message->header);
124  skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
125 
126  nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
127  }
128 }
129 
130 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
131  struct sk_buff *skb)
132 {
133  del_timer_sync(&hdev->cmd_timer);
134 
135  if (hdev->cmd_pending_msg->cb)
136  hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
137  skb, err);
138  else
139  kfree_skb(skb);
140 
141  kfree(hdev->cmd_pending_msg);
142  hdev->cmd_pending_msg = NULL;
143 
144  schedule_work(&hdev->msg_tx_work);
145 }
146 
147 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
148  struct sk_buff *skb)
149 {
150  mutex_lock(&hdev->msg_tx_mutex);
151 
152  if (hdev->cmd_pending_msg == NULL) {
153  kfree_skb(skb);
154  goto exit;
155  }
156 
157  __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
158 
159 exit:
160  mutex_unlock(&hdev->msg_tx_mutex);
161 }
162 
163 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
164  struct sk_buff *skb)
165 {
166  kfree_skb(skb);
167 }
168 
169 static u32 nfc_hci_sak_to_protocol(u8 sak)
170 {
171  switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
172  case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
173  return NFC_PROTO_MIFARE_MASK;
174  case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
175  return NFC_PROTO_ISO14443_MASK;
176  case NFC_HCI_TYPE_A_SEL_PROT_DEP:
177  return NFC_PROTO_NFC_DEP_MASK;
178  case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
179  return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
180  default:
181  return 0xffffffff;
182  }
183 }
184 
185 static int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
186 {
187  struct nfc_target *targets;
188  struct sk_buff *atqa_skb = NULL;
189  struct sk_buff *sak_skb = NULL;
190  struct sk_buff *uid_skb = NULL;
191  int r;
192 
193  pr_debug("from gate %d\n", gate);
194 
195  targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
196  if (targets == NULL)
197  return -ENOMEM;
198 
199  switch (gate) {
200  case NFC_HCI_RF_READER_A_GATE:
201  r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
202  NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
203  if (r < 0)
204  goto exit;
205 
206  r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
207  NFC_HCI_RF_READER_A_SAK, &sak_skb);
208  if (r < 0)
209  goto exit;
210 
211  if (atqa_skb->len != 2 || sak_skb->len != 1) {
212  r = -EPROTO;
213  goto exit;
214  }
215 
216  targets->supported_protocols =
217  nfc_hci_sak_to_protocol(sak_skb->data[0]);
218  if (targets->supported_protocols == 0xffffffff) {
219  r = -EPROTO;
220  goto exit;
221  }
222 
223  targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
224  targets->sel_res = sak_skb->data[0];
225 
226  r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
227  NFC_HCI_RF_READER_A_UID, &uid_skb);
228  if (r < 0)
229  goto exit;
230 
231  if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
232  r = -EPROTO;
233  goto exit;
234  }
235 
236  memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
237  targets->nfcid1_len = uid_skb->len;
238 
239  if (hdev->ops->complete_target_discovered) {
240  r = hdev->ops->complete_target_discovered(hdev, gate,
241  targets);
242  if (r < 0)
243  goto exit;
244  }
245  break;
246  case NFC_HCI_RF_READER_B_GATE:
247  targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
248  break;
249  default:
250  if (hdev->ops->target_from_gate)
251  r = hdev->ops->target_from_gate(hdev, gate, targets);
252  else
253  r = -EPROTO;
254  if (r < 0)
255  goto exit;
256 
257  if (hdev->ops->complete_target_discovered) {
258  r = hdev->ops->complete_target_discovered(hdev, gate,
259  targets);
260  if (r < 0)
261  goto exit;
262  }
263  break;
264  }
265 
266  targets->hci_reader_gate = gate;
267 
268  r = nfc_targets_found(hdev->ndev, targets, 1);
269 
270 exit:
271  kfree(targets);
272  kfree_skb(atqa_skb);
273  kfree_skb(sak_skb);
274  kfree_skb(uid_skb);
275 
276  return r;
277 }
278 
279 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
280  struct sk_buff *skb)
281 {
282  int r = 0;
283 
284  switch (event) {
285  case NFC_HCI_EVT_TARGET_DISCOVERED:
286  if (skb->len < 1) { /* no status data? */
287  r = -EPROTO;
288  goto exit;
289  }
290 
291  if (skb->data[0] == 3) {
292  /* TODO: Multiple targets in field, none activated
293  * poll is supposedly stopped, but there is no
294  * single target to activate, so nothing to report
295  * up.
296  * if we need to restart poll, we must save the
297  * protocols from the initial poll and reuse here.
298  */
299  }
300 
301  if (skb->data[0] != 0) {
302  r = -EPROTO;
303  goto exit;
304  }
305 
306  r = nfc_hci_target_discovered(hdev,
307  nfc_hci_pipe2gate(hdev, pipe));
308  break;
309  default:
310  /* TODO: Unknown events are hardware specific
311  * pass them to the driver (needs a new hci_ops) */
312  break;
313  }
314 
315 exit:
316  kfree_skb(skb);
317 
318  if (r) {
319  /* TODO: There was an error dispatching the event,
320  * how to propagate up to nfc core?
321  */
322  }
323 }
324 
325 static void nfc_hci_cmd_timeout(unsigned long data)
326 {
327  struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
328 
329  schedule_work(&hdev->msg_tx_work);
330 }
331 
332 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
333  struct nfc_hci_gate *gates)
334 {
335  int r;
336  while (gate_count--) {
337  r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
338  gates->gate, gates->pipe);
339  if (r < 0)
340  return r;
341  gates++;
342  }
343 
344  return 0;
345 }
346 
347 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
348 {
349  struct sk_buff *skb = NULL;
350  int r;
351 
352  if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
353  return -EPROTO;
354 
355  r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
356  hdev->init_data.gates[0].gate,
357  hdev->init_data.gates[0].pipe);
358  if (r < 0)
359  goto exit;
360 
361  r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
362  NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
363  if (r < 0)
364  goto disconnect_all;
365 
366  if (skb->len && skb->len == strlen(hdev->init_data.session_id))
367  if (memcmp(hdev->init_data.session_id, skb->data,
368  skb->len) == 0) {
369  /* TODO ELa: restore gate<->pipe table from
370  * some TBD location.
371  * note: it doesn't seem possible to get the chip
372  * currently open gate/pipe table.
373  * It is only possible to obtain the supported
374  * gate list.
375  */
376 
377  /* goto exit
378  * For now, always do a full initialization */
379  }
380 
381  r = nfc_hci_disconnect_all_gates(hdev);
382  if (r < 0)
383  goto exit;
384 
385  r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
386  hdev->init_data.gates);
387  if (r < 0)
388  goto disconnect_all;
389 
390  r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
391  NFC_HCI_ADMIN_SESSION_IDENTITY,
392  hdev->init_data.session_id,
393  strlen(hdev->init_data.session_id));
394  if (r == 0)
395  goto exit;
396 
397 disconnect_all:
398  nfc_hci_disconnect_all_gates(hdev);
399 
400 exit:
401  kfree_skb(skb);
402 
403  return r;
404 }
405 
406 static int hci_dev_version(struct nfc_hci_dev *hdev)
407 {
408  int r;
409  struct sk_buff *skb;
410 
411  r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
412  NFC_HCI_ID_MGMT_VERSION_SW, &skb);
413  if (r < 0)
414  return r;
415 
416  if (skb->len != 3) {
417  kfree_skb(skb);
418  return -EINVAL;
419  }
420 
421  hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
422  hdev->sw_patch = skb->data[0] & 0x0f;
423  hdev->sw_flashlib_major = skb->data[1];
424  hdev->sw_flashlib_minor = skb->data[2];
425 
426  kfree_skb(skb);
427 
428  r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
429  NFC_HCI_ID_MGMT_VERSION_HW, &skb);
430  if (r < 0)
431  return r;
432 
433  if (skb->len != 3) {
434  kfree_skb(skb);
435  return -EINVAL;
436  }
437 
438  hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
439  hdev->hw_version = skb->data[0] & 0x1f;
440  hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
441  hdev->hw_software = skb->data[1] & 0x3f;
442  hdev->hw_bsid = skb->data[2];
443 
444  kfree_skb(skb);
445 
446  pr_info("SOFTWARE INFO:\n");
447  pr_info("RomLib : %d\n", hdev->sw_romlib);
448  pr_info("Patch : %d\n", hdev->sw_patch);
449  pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
450  pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
451  pr_info("HARDWARE INFO:\n");
452  pr_info("Derivative : %d\n", hdev->hw_derivative);
453  pr_info("HW Version : %d\n", hdev->hw_version);
454  pr_info("#MPW : %d\n", hdev->hw_mpw);
455  pr_info("Software : %d\n", hdev->hw_software);
456  pr_info("BSID Version : %d\n", hdev->hw_bsid);
457 
458  return 0;
459 }
460 
461 static int hci_dev_up(struct nfc_dev *nfc_dev)
462 {
463  struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
464  int r = 0;
465 
466  if (hdev->ops->open) {
467  r = hdev->ops->open(hdev);
468  if (r < 0)
469  return r;
470  }
471 
472  r = nfc_llc_start(hdev->llc);
473  if (r < 0)
474  goto exit_close;
475 
476  r = hci_dev_session_init(hdev);
477  if (r < 0)
478  goto exit_llc;
479 
480  r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
481  NFC_HCI_EVT_END_OPERATION, NULL, 0);
482  if (r < 0)
483  goto exit_llc;
484 
485  if (hdev->ops->hci_ready) {
486  r = hdev->ops->hci_ready(hdev);
487  if (r < 0)
488  goto exit_llc;
489  }
490 
491  r = hci_dev_version(hdev);
492  if (r < 0)
493  goto exit_llc;
494 
495  return 0;
496 
497 exit_llc:
498  nfc_llc_stop(hdev->llc);
499 
500 exit_close:
501  if (hdev->ops->close)
502  hdev->ops->close(hdev);
503 
504  return r;
505 }
506 
507 static int hci_dev_down(struct nfc_dev *nfc_dev)
508 {
509  struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
510 
511  nfc_llc_stop(hdev->llc);
512 
513  if (hdev->ops->close)
514  hdev->ops->close(hdev);
515 
516  memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
517 
518  return 0;
519 }
520 
521 static int hci_start_poll(struct nfc_dev *nfc_dev,
522  u32 im_protocols, u32 tm_protocols)
523 {
524  struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
525 
526  if (hdev->ops->start_poll)
527  return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
528  else
529  return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
530  NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
531 }
532 
533 static void hci_stop_poll(struct nfc_dev *nfc_dev)
534 {
535  struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
536 
537  nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
538  NFC_HCI_EVT_END_OPERATION, NULL, 0);
539 }
540 
541 static int hci_activate_target(struct nfc_dev *nfc_dev,
542  struct nfc_target *target, u32 protocol)
543 {
544  return 0;
545 }
546 
547 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
548  struct nfc_target *target)
549 {
550 }
551 
552 #define HCI_CB_TYPE_TRANSCEIVE 1
553 
554 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
555 {
556  struct nfc_hci_dev *hdev = context;
557 
558  switch (hdev->async_cb_type) {
559  case HCI_CB_TYPE_TRANSCEIVE:
560  /*
561  * TODO: Check RF Error indicator to make sure data is valid.
562  * It seems that HCI cmd can complete without error, but data
563  * can be invalid if an RF error occured? Ignore for now.
564  */
565  if (err == 0)
566  skb_trim(skb, skb->len - 1); /* RF Err ind */
567 
568  hdev->async_cb(hdev->async_cb_context, skb, err);
569  break;
570  default:
571  if (err == 0)
572  kfree_skb(skb);
573  break;
574  }
575 }
576 
577 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
578  struct sk_buff *skb, data_exchange_cb_t cb,
579  void *cb_context)
580 {
581  struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
582  int r;
583 
584  pr_debug("target_idx=%d\n", target->idx);
585 
586  switch (target->hci_reader_gate) {
587  case NFC_HCI_RF_READER_A_GATE:
588  case NFC_HCI_RF_READER_B_GATE:
589  if (hdev->ops->data_exchange) {
590  r = hdev->ops->data_exchange(hdev, target, skb, cb,
591  cb_context);
592  if (r <= 0) /* handled */
593  break;
594  }
595 
596  *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
597 
598  hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
599  hdev->async_cb = cb;
600  hdev->async_cb_context = cb_context;
601 
602  r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
603  NFC_HCI_WR_XCHG_DATA, skb->data,
604  skb->len, hci_transceive_cb, hdev);
605  break;
606  default:
607  if (hdev->ops->data_exchange) {
608  r = hdev->ops->data_exchange(hdev, target, skb, cb,
609  cb_context);
610  if (r == 1)
611  r = -ENOTSUPP;
612  }
613  else
614  r = -ENOTSUPP;
615  break;
616  }
617 
618  kfree_skb(skb);
619 
620  return r;
621 }
622 
623 static int hci_check_presence(struct nfc_dev *nfc_dev,
624  struct nfc_target *target)
625 {
626  struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
627 
628  if (hdev->ops->check_presence)
629  return hdev->ops->check_presence(hdev, target);
630 
631  return 0;
632 }
633 
634 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
635 {
636  mutex_lock(&hdev->msg_tx_mutex);
637 
638  if (hdev->cmd_pending_msg == NULL) {
639  nfc_driver_failure(hdev->ndev, err);
640  goto exit;
641  }
642 
643  __nfc_hci_cmd_completion(hdev, err, NULL);
644 
645 exit:
646  mutex_unlock(&hdev->msg_tx_mutex);
647 }
648 
649 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
650 {
651  nfc_hci_failure(hdev, err);
652 }
653 
654 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
655 {
656  struct hcp_packet *packet;
657  u8 type;
658  u8 instruction;
659  struct sk_buff *hcp_skb;
660  u8 pipe;
661  struct sk_buff *frag_skb;
662  int msg_len;
663 
664  packet = (struct hcp_packet *)skb->data;
665  if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
666  skb_queue_tail(&hdev->rx_hcp_frags, skb);
667  return;
668  }
669 
670  /* it's the last fragment. Does it need re-aggregation? */
671  if (skb_queue_len(&hdev->rx_hcp_frags)) {
672  pipe = packet->header & NFC_HCI_FRAGMENT;
673  skb_queue_tail(&hdev->rx_hcp_frags, skb);
674 
675  msg_len = 0;
676  skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
677  msg_len += (frag_skb->len -
678  NFC_HCI_HCP_PACKET_HEADER_LEN);
679  }
680 
681  hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
682  msg_len, GFP_KERNEL);
683  if (hcp_skb == NULL) {
684  nfc_hci_failure(hdev, -ENOMEM);
685  return;
686  }
687 
688  *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
689 
690  skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
691  msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
692  memcpy(skb_put(hcp_skb, msg_len),
693  frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
694  msg_len);
695  }
696 
697  skb_queue_purge(&hdev->rx_hcp_frags);
698  } else {
699  packet->header &= NFC_HCI_FRAGMENT;
700  hcp_skb = skb;
701  }
702 
703  /* if this is a response, dispatch immediately to
704  * unblock waiting cmd context. Otherwise, enqueue to dispatch
705  * in separate context where handler can also execute command.
706  */
707  packet = (struct hcp_packet *)hcp_skb->data;
708  type = HCP_MSG_GET_TYPE(packet->message.header);
709  if (type == NFC_HCI_HCP_RESPONSE) {
710  pipe = packet->header;
711  instruction = HCP_MSG_GET_CMD(packet->message.header);
712  skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
713  NFC_HCI_HCP_MESSAGE_HEADER_LEN);
714  nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
715  } else {
716  skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
717  schedule_work(&hdev->msg_rx_work);
718  }
719 }
720 
721 static struct nfc_ops hci_nfc_ops = {
722  .dev_up = hci_dev_up,
723  .dev_down = hci_dev_down,
724  .start_poll = hci_start_poll,
725  .stop_poll = hci_stop_poll,
726  .activate_target = hci_activate_target,
727  .deactivate_target = hci_deactivate_target,
728  .im_transceive = hci_transceive,
729  .check_presence = hci_check_presence,
730 };
731 
732 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
733  struct nfc_hci_init_data *init_data,
734  u32 protocols,
735  const char *llc_name,
736  int tx_headroom,
737  int tx_tailroom,
738  int max_link_payload)
739 {
740  struct nfc_hci_dev *hdev;
741 
742  if (ops->xmit == NULL)
743  return NULL;
744 
745  if (protocols == 0)
746  return NULL;
747 
748  hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
749  if (hdev == NULL)
750  return NULL;
751 
752  hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
753  nfc_hci_recv_from_llc, tx_headroom,
754  tx_tailroom, nfc_hci_llc_failure);
755  if (hdev->llc == NULL) {
756  kfree(hdev);
757  return NULL;
758  }
759 
760  hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
761  tx_headroom + HCI_CMDS_HEADROOM,
762  tx_tailroom);
763  if (!hdev->ndev) {
764  nfc_llc_free(hdev->llc);
765  kfree(hdev);
766  return NULL;
767  }
768 
769  hdev->ops = ops;
770  hdev->max_data_link_payload = max_link_payload;
771  hdev->init_data = *init_data;
772 
773  nfc_set_drvdata(hdev->ndev, hdev);
774 
775  memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
776 
777  return hdev;
778 }
779 EXPORT_SYMBOL(nfc_hci_allocate_device);
780 
781 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
782 {
783  nfc_free_device(hdev->ndev);
784  nfc_llc_free(hdev->llc);
785  kfree(hdev);
786 }
787 EXPORT_SYMBOL(nfc_hci_free_device);
788 
789 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
790 {
791  mutex_init(&hdev->msg_tx_mutex);
792 
793  INIT_LIST_HEAD(&hdev->msg_tx_queue);
794 
795  INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
796 
797  init_timer(&hdev->cmd_timer);
798  hdev->cmd_timer.data = (unsigned long)hdev;
799  hdev->cmd_timer.function = nfc_hci_cmd_timeout;
800 
801  skb_queue_head_init(&hdev->rx_hcp_frags);
802 
803  INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
804 
805  skb_queue_head_init(&hdev->msg_rx_queue);
806 
807  return nfc_register_device(hdev->ndev);
808 }
809 EXPORT_SYMBOL(nfc_hci_register_device);
810 
811 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
812 {
813  struct hci_msg *msg, *n;
814 
815  skb_queue_purge(&hdev->rx_hcp_frags);
816  skb_queue_purge(&hdev->msg_rx_queue);
817 
818  list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
819  list_del(&msg->msg_l);
820  skb_queue_purge(&msg->msg_frags);
821  kfree(msg);
822  }
823 
824  del_timer_sync(&hdev->cmd_timer);
825 
826  nfc_unregister_device(hdev->ndev);
827 
828  cancel_work_sync(&hdev->msg_tx_work);
829  cancel_work_sync(&hdev->msg_rx_work);
830 }
831 EXPORT_SYMBOL(nfc_hci_unregister_device);
832 
833 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
834 {
835  hdev->clientdata = clientdata;
836 }
837 EXPORT_SYMBOL(nfc_hci_set_clientdata);
838 
839 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
840 {
841  return hdev->clientdata;
842 }
843 EXPORT_SYMBOL(nfc_hci_get_clientdata);
844 
845 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
846 {
847  nfc_hci_failure(hdev, err);
848 }
849 EXPORT_SYMBOL(nfc_hci_driver_failure);
850 
851 void inline nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
852 {
853  nfc_llc_rcv_from_drv(hdev->llc, skb);
854 }
855 EXPORT_SYMBOL(nfc_hci_recv_frame);
856 
857 static int __init nfc_hci_init(void)
858 {
859  return nfc_llc_init();
860 }
861 
862 static void __exit nfc_hci_exit(void)
863 {
864  nfc_llc_exit();
865 }
866 
867 subsys_initcall(nfc_hci_init);
868 module_exit(nfc_hci_exit);
869 
870 MODULE_LICENSE("GPL");
871 MODULE_DESCRIPTION("NFC HCI Core");
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