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

Version: ~ [ linux-5.8-rc4 ] ~ [ linux-5.7.7 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.50 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.131 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.187 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.229 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.229 ] ~ [ 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-3.16.85 ] ~ [ 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, see <http://www.gnu.org/licenses/>.
 16  */
 17 
 18 #define pr_fmt(fmt) "hci: %s: " fmt, __func__
 19 
 20 #include <linux/init.h>
 21 #include <linux/kernel.h>
 22 #include <linux/module.h>
 23 #include <linux/nfc.h>
 24 
 25 #include <net/nfc/nfc.h>
 26 #include <net/nfc/hci.h>
 27 #include <net/nfc/llc.h>
 28 
 29 #include "hci.h"
 30 
 31 /* Largest headroom needed for outgoing HCI commands */
 32 #define HCI_CMDS_HEADROOM 1
 33 
 34 int nfc_hci_result_to_errno(u8 result)
 35 {
 36         switch (result) {
 37         case NFC_HCI_ANY_OK:
 38                 return 0;
 39         case NFC_HCI_ANY_E_REG_PAR_UNKNOWN:
 40                 return -EOPNOTSUPP;
 41         case NFC_HCI_ANY_E_TIMEOUT:
 42                 return -ETIME;
 43         default:
 44                 return -1;
 45         }
 46 }
 47 EXPORT_SYMBOL(nfc_hci_result_to_errno);
 48 
 49 static void nfc_hci_msg_tx_work(struct work_struct *work)
 50 {
 51         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
 52                                                 msg_tx_work);
 53         struct hci_msg *msg;
 54         struct sk_buff *skb;
 55         int r = 0;
 56 
 57         mutex_lock(&hdev->msg_tx_mutex);
 58         if (hdev->shutting_down)
 59                 goto exit;
 60 
 61         if (hdev->cmd_pending_msg) {
 62                 if (timer_pending(&hdev->cmd_timer) == 0) {
 63                         if (hdev->cmd_pending_msg->cb)
 64                                 hdev->cmd_pending_msg->cb(hdev->
 65                                                           cmd_pending_msg->
 66                                                           cb_context,
 67                                                           NULL,
 68                                                           -ETIME);
 69                         kfree(hdev->cmd_pending_msg);
 70                         hdev->cmd_pending_msg = NULL;
 71                 } else {
 72                         goto exit;
 73                 }
 74         }
 75 
 76 next_msg:
 77         if (list_empty(&hdev->msg_tx_queue))
 78                 goto exit;
 79 
 80         msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
 81         list_del(&msg->msg_l);
 82 
 83         pr_debug("msg_tx_queue has a cmd to send\n");
 84         while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
 85                 r = nfc_llc_xmit_from_hci(hdev->llc, skb);
 86                 if (r < 0) {
 87                         kfree_skb(skb);
 88                         skb_queue_purge(&msg->msg_frags);
 89                         if (msg->cb)
 90                                 msg->cb(msg->cb_context, NULL, r);
 91                         kfree(msg);
 92                         break;
 93                 }
 94         }
 95 
 96         if (r)
 97                 goto next_msg;
 98 
 99         if (msg->wait_response == false) {
100                 kfree(msg);
101                 goto next_msg;
102         }
103 
104         hdev->cmd_pending_msg = msg;
105         mod_timer(&hdev->cmd_timer, jiffies +
106                   msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
107 
108 exit:
109         mutex_unlock(&hdev->msg_tx_mutex);
110 }
111 
112 static void nfc_hci_msg_rx_work(struct work_struct *work)
113 {
114         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
115                                                 msg_rx_work);
116         struct sk_buff *skb;
117         struct hcp_message *message;
118         u8 pipe;
119         u8 type;
120         u8 instruction;
121 
122         while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
123                 pipe = skb->data[0];
124                 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
125                 message = (struct hcp_message *)skb->data;
126                 type = HCP_MSG_GET_TYPE(message->header);
127                 instruction = HCP_MSG_GET_CMD(message->header);
128                 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
129 
130                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
131         }
132 }
133 
134 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
135                                      struct sk_buff *skb)
136 {
137         del_timer_sync(&hdev->cmd_timer);
138 
139         if (hdev->cmd_pending_msg->cb)
140                 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
141                                           skb, err);
142         else
143                 kfree_skb(skb);
144 
145         kfree(hdev->cmd_pending_msg);
146         hdev->cmd_pending_msg = NULL;
147 
148         schedule_work(&hdev->msg_tx_work);
149 }
150 
151 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
152                            struct sk_buff *skb)
153 {
154         mutex_lock(&hdev->msg_tx_mutex);
155 
156         if (hdev->cmd_pending_msg == NULL) {
157                 kfree_skb(skb);
158                 goto exit;
159         }
160 
161         __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
162 
163 exit:
164         mutex_unlock(&hdev->msg_tx_mutex);
165 }
166 
167 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
168                           struct sk_buff *skb)
169 {
170         kfree_skb(skb);
171 }
172 
173 u32 nfc_hci_sak_to_protocol(u8 sak)
174 {
175         switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
176         case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
177                 return NFC_PROTO_MIFARE_MASK;
178         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
179                 return NFC_PROTO_ISO14443_MASK;
180         case NFC_HCI_TYPE_A_SEL_PROT_DEP:
181                 return NFC_PROTO_NFC_DEP_MASK;
182         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
183                 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
184         default:
185                 return 0xffffffff;
186         }
187 }
188 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
189 
190 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
191 {
192         struct nfc_target *targets;
193         struct sk_buff *atqa_skb = NULL;
194         struct sk_buff *sak_skb = NULL;
195         struct sk_buff *uid_skb = NULL;
196         int r;
197 
198         pr_debug("from gate %d\n", gate);
199 
200         targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
201         if (targets == NULL)
202                 return -ENOMEM;
203 
204         switch (gate) {
205         case NFC_HCI_RF_READER_A_GATE:
206                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
207                                       NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
208                 if (r < 0)
209                         goto exit;
210 
211                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
212                                       NFC_HCI_RF_READER_A_SAK, &sak_skb);
213                 if (r < 0)
214                         goto exit;
215 
216                 if (atqa_skb->len != 2 || sak_skb->len != 1) {
217                         r = -EPROTO;
218                         goto exit;
219                 }
220 
221                 targets->supported_protocols =
222                                 nfc_hci_sak_to_protocol(sak_skb->data[0]);
223                 if (targets->supported_protocols == 0xffffffff) {
224                         r = -EPROTO;
225                         goto exit;
226                 }
227 
228                 targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
229                 targets->sel_res = sak_skb->data[0];
230 
231                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
232                                       NFC_HCI_RF_READER_A_UID, &uid_skb);
233                 if (r < 0)
234                         goto exit;
235 
236                 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
237                         r = -EPROTO;
238                         goto exit;
239                 }
240 
241                 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
242                 targets->nfcid1_len = uid_skb->len;
243 
244                 if (hdev->ops->complete_target_discovered) {
245                         r = hdev->ops->complete_target_discovered(hdev, gate,
246                                                                   targets);
247                         if (r < 0)
248                                 goto exit;
249                 }
250                 break;
251         case NFC_HCI_RF_READER_B_GATE:
252                 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
253                 break;
254         default:
255                 if (hdev->ops->target_from_gate)
256                         r = hdev->ops->target_from_gate(hdev, gate, targets);
257                 else
258                         r = -EPROTO;
259                 if (r < 0)
260                         goto exit;
261 
262                 if (hdev->ops->complete_target_discovered) {
263                         r = hdev->ops->complete_target_discovered(hdev, gate,
264                                                                   targets);
265                         if (r < 0)
266                                 goto exit;
267                 }
268                 break;
269         }
270 
271         /* if driver set the new gate, we will skip the old one */
272         if (targets->hci_reader_gate == 0x00)
273                 targets->hci_reader_gate = gate;
274 
275         r = nfc_targets_found(hdev->ndev, targets, 1);
276 
277 exit:
278         kfree(targets);
279         kfree_skb(atqa_skb);
280         kfree_skb(sak_skb);
281         kfree_skb(uid_skb);
282 
283         return r;
284 }
285 EXPORT_SYMBOL(nfc_hci_target_discovered);
286 
287 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
288                             struct sk_buff *skb)
289 {
290         int r = 0;
291         u8 gate = nfc_hci_pipe2gate(hdev, pipe);
292 
293         if (gate == 0xff) {
294                 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
295                 goto exit;
296         }
297 
298         if (hdev->ops->event_received) {
299                 r = hdev->ops->event_received(hdev, gate, event, skb);
300                 if (r <= 0)
301                         goto exit_noskb;
302         }
303 
304         switch (event) {
305         case NFC_HCI_EVT_TARGET_DISCOVERED:
306                 if (skb->len < 1) {     /* no status data? */
307                         r = -EPROTO;
308                         goto exit;
309                 }
310 
311                 if (skb->data[0] == 3) {
312                         /* TODO: Multiple targets in field, none activated
313                          * poll is supposedly stopped, but there is no
314                          * single target to activate, so nothing to report
315                          * up.
316                          * if we need to restart poll, we must save the
317                          * protocols from the initial poll and reuse here.
318                          */
319                 }
320 
321                 if (skb->data[0] != 0) {
322                         r = -EPROTO;
323                         goto exit;
324                 }
325 
326                 r = nfc_hci_target_discovered(hdev, gate);
327                 break;
328         default:
329                 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
330                 r = -EINVAL;
331                 break;
332         }
333 
334 exit:
335         kfree_skb(skb);
336 
337 exit_noskb:
338         if (r)
339                 nfc_hci_driver_failure(hdev, r);
340 }
341 
342 static void nfc_hci_cmd_timeout(unsigned long data)
343 {
344         struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
345 
346         schedule_work(&hdev->msg_tx_work);
347 }
348 
349 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
350                                  struct nfc_hci_gate *gates)
351 {
352         int r;
353         while (gate_count--) {
354                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
355                                          gates->gate, gates->pipe);
356                 if (r < 0)
357                         return r;
358                 gates++;
359         }
360 
361         return 0;
362 }
363 
364 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
365 {
366         struct sk_buff *skb = NULL;
367         int r;
368 
369         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
370                 return -EPROTO;
371 
372         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
373                                  hdev->init_data.gates[0].gate,
374                                  hdev->init_data.gates[0].pipe);
375         if (r < 0)
376                 goto exit;
377 
378         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
379                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
380         if (r < 0)
381                 goto disconnect_all;
382 
383         if (skb->len && skb->len == strlen(hdev->init_data.session_id))
384                 if (memcmp(hdev->init_data.session_id, skb->data,
385                            skb->len) == 0) {
386                         /* TODO ELa: restore gate<->pipe table from
387                          * some TBD location.
388                          * note: it doesn't seem possible to get the chip
389                          * currently open gate/pipe table.
390                          * It is only possible to obtain the supported
391                          * gate list.
392                          */
393 
394                         /* goto exit
395                          * For now, always do a full initialization */
396                 }
397 
398         r = nfc_hci_disconnect_all_gates(hdev);
399         if (r < 0)
400                 goto exit;
401 
402         r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
403                                   hdev->init_data.gates);
404         if (r < 0)
405                 goto disconnect_all;
406 
407         r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
408                               NFC_HCI_ADMIN_SESSION_IDENTITY,
409                               hdev->init_data.session_id,
410                               strlen(hdev->init_data.session_id));
411         if (r == 0)
412                 goto exit;
413 
414 disconnect_all:
415         nfc_hci_disconnect_all_gates(hdev);
416 
417 exit:
418         kfree_skb(skb);
419 
420         return r;
421 }
422 
423 static int hci_dev_version(struct nfc_hci_dev *hdev)
424 {
425         int r;
426         struct sk_buff *skb;
427 
428         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
429                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
430         if (r == -EOPNOTSUPP) {
431                 pr_info("Software/Hardware info not available\n");
432                 return 0;
433         }
434         if (r < 0)
435                 return r;
436 
437         if (skb->len != 3) {
438                 kfree_skb(skb);
439                 return -EINVAL;
440         }
441 
442         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
443         hdev->sw_patch = skb->data[0] & 0x0f;
444         hdev->sw_flashlib_major = skb->data[1];
445         hdev->sw_flashlib_minor = skb->data[2];
446 
447         kfree_skb(skb);
448 
449         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
450                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
451         if (r < 0)
452                 return r;
453 
454         if (skb->len != 3) {
455                 kfree_skb(skb);
456                 return -EINVAL;
457         }
458 
459         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
460         hdev->hw_version = skb->data[0] & 0x1f;
461         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
462         hdev->hw_software = skb->data[1] & 0x3f;
463         hdev->hw_bsid = skb->data[2];
464 
465         kfree_skb(skb);
466 
467         pr_info("SOFTWARE INFO:\n");
468         pr_info("RomLib         : %d\n", hdev->sw_romlib);
469         pr_info("Patch          : %d\n", hdev->sw_patch);
470         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
471         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
472         pr_info("HARDWARE INFO:\n");
473         pr_info("Derivative     : %d\n", hdev->hw_derivative);
474         pr_info("HW Version     : %d\n", hdev->hw_version);
475         pr_info("#MPW           : %d\n", hdev->hw_mpw);
476         pr_info("Software       : %d\n", hdev->hw_software);
477         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
478 
479         return 0;
480 }
481 
482 static int hci_dev_up(struct nfc_dev *nfc_dev)
483 {
484         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
485         int r = 0;
486 
487         if (hdev->ops->open) {
488                 r = hdev->ops->open(hdev);
489                 if (r < 0)
490                         return r;
491         }
492 
493         r = nfc_llc_start(hdev->llc);
494         if (r < 0)
495                 goto exit_close;
496 
497         r = hci_dev_session_init(hdev);
498         if (r < 0)
499                 goto exit_llc;
500 
501         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
502                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
503         if (r < 0)
504                 goto exit_llc;
505 
506         if (hdev->ops->hci_ready) {
507                 r = hdev->ops->hci_ready(hdev);
508                 if (r < 0)
509                         goto exit_llc;
510         }
511 
512         r = hci_dev_version(hdev);
513         if (r < 0)
514                 goto exit_llc;
515 
516         return 0;
517 
518 exit_llc:
519         nfc_llc_stop(hdev->llc);
520 
521 exit_close:
522         if (hdev->ops->close)
523                 hdev->ops->close(hdev);
524 
525         return r;
526 }
527 
528 static int hci_dev_down(struct nfc_dev *nfc_dev)
529 {
530         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
531 
532         nfc_llc_stop(hdev->llc);
533 
534         if (hdev->ops->close)
535                 hdev->ops->close(hdev);
536 
537         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
538 
539         return 0;
540 }
541 
542 static int hci_start_poll(struct nfc_dev *nfc_dev,
543                           u32 im_protocols, u32 tm_protocols)
544 {
545         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
546 
547         if (hdev->ops->start_poll)
548                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
549         else
550                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
551                                           NFC_HCI_EVT_READER_REQUESTED,
552                                           NULL, 0);
553 }
554 
555 static void hci_stop_poll(struct nfc_dev *nfc_dev)
556 {
557         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
558 
559         nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
560                            NFC_HCI_EVT_END_OPERATION, NULL, 0);
561 }
562 
563 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
564                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
565 {
566         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
567 
568         if (!hdev->ops->dep_link_up)
569                 return 0;
570 
571         return hdev->ops->dep_link_up(hdev, target, comm_mode,
572                                       gb, gb_len);
573 }
574 
575 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
576 {
577         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
578 
579         if (!hdev->ops->dep_link_down)
580                 return 0;
581 
582         return hdev->ops->dep_link_down(hdev);
583 }
584 
585 static int hci_activate_target(struct nfc_dev *nfc_dev,
586                                struct nfc_target *target, u32 protocol)
587 {
588         return 0;
589 }
590 
591 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
592                                   struct nfc_target *target)
593 {
594 }
595 
596 #define HCI_CB_TYPE_TRANSCEIVE 1
597 
598 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
599 {
600         struct nfc_hci_dev *hdev = context;
601 
602         switch (hdev->async_cb_type) {
603         case HCI_CB_TYPE_TRANSCEIVE:
604                 /*
605                  * TODO: Check RF Error indicator to make sure data is valid.
606                  * It seems that HCI cmd can complete without error, but data
607                  * can be invalid if an RF error occured? Ignore for now.
608                  */
609                 if (err == 0)
610                         skb_trim(skb, skb->len - 1); /* RF Err ind */
611 
612                 hdev->async_cb(hdev->async_cb_context, skb, err);
613                 break;
614         default:
615                 if (err == 0)
616                         kfree_skb(skb);
617                 break;
618         }
619 }
620 
621 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
622                           struct sk_buff *skb, data_exchange_cb_t cb,
623                           void *cb_context)
624 {
625         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
626         int r;
627 
628         pr_debug("target_idx=%d\n", target->idx);
629 
630         switch (target->hci_reader_gate) {
631         case NFC_HCI_RF_READER_A_GATE:
632         case NFC_HCI_RF_READER_B_GATE:
633                 if (hdev->ops->im_transceive) {
634                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
635                                                      cb_context);
636                         if (r <= 0)     /* handled */
637                                 break;
638                 }
639 
640                 *skb_push(skb, 1) = 0;  /* CTR, see spec:10.2.2.1 */
641 
642                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
643                 hdev->async_cb = cb;
644                 hdev->async_cb_context = cb_context;
645 
646                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
647                                            NFC_HCI_WR_XCHG_DATA, skb->data,
648                                            skb->len, hci_transceive_cb, hdev);
649                 break;
650         default:
651                 if (hdev->ops->im_transceive) {
652                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
653                                                      cb_context);
654                         if (r == 1)
655                                 r = -ENOTSUPP;
656                 } else {
657                         r = -ENOTSUPP;
658                 }
659                 break;
660         }
661 
662         kfree_skb(skb);
663 
664         return r;
665 }
666 
667 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
668 {
669         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
670 
671         if (!hdev->ops->tm_send) {
672                 kfree_skb(skb);
673                 return -ENOTSUPP;
674         }
675 
676         return hdev->ops->tm_send(hdev, skb);
677 }
678 
679 static int hci_check_presence(struct nfc_dev *nfc_dev,
680                               struct nfc_target *target)
681 {
682         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
683 
684         if (!hdev->ops->check_presence)
685                 return 0;
686 
687         return hdev->ops->check_presence(hdev, target);
688 }
689 
690 static int hci_discover_se(struct nfc_dev *nfc_dev)
691 {
692         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
693 
694         if (hdev->ops->discover_se)
695                 return hdev->ops->discover_se(hdev);
696 
697         return 0;
698 }
699 
700 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
701 {
702         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
703 
704         if (hdev->ops->enable_se)
705                 return hdev->ops->enable_se(hdev, se_idx);
706 
707         return 0;
708 }
709 
710 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
711 {
712         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
713 
714         if (hdev->ops->disable_se)
715                 return hdev->ops->disable_se(hdev, se_idx);
716 
717         return 0;
718 }
719 
720 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
721 {
722         mutex_lock(&hdev->msg_tx_mutex);
723 
724         if (hdev->cmd_pending_msg == NULL) {
725                 nfc_driver_failure(hdev->ndev, err);
726                 goto exit;
727         }
728 
729         __nfc_hci_cmd_completion(hdev, err, NULL);
730 
731 exit:
732         mutex_unlock(&hdev->msg_tx_mutex);
733 }
734 
735 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
736 {
737         nfc_hci_failure(hdev, err);
738 }
739 
740 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
741 {
742         struct hcp_packet *packet;
743         u8 type;
744         u8 instruction;
745         struct sk_buff *hcp_skb;
746         u8 pipe;
747         struct sk_buff *frag_skb;
748         int msg_len;
749 
750         packet = (struct hcp_packet *)skb->data;
751         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
752                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
753                 return;
754         }
755 
756         /* it's the last fragment. Does it need re-aggregation? */
757         if (skb_queue_len(&hdev->rx_hcp_frags)) {
758                 pipe = packet->header & NFC_HCI_FRAGMENT;
759                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
760 
761                 msg_len = 0;
762                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
763                         msg_len += (frag_skb->len -
764                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
765                 }
766 
767                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
768                                              msg_len, GFP_KERNEL);
769                 if (hcp_skb == NULL) {
770                         nfc_hci_failure(hdev, -ENOMEM);
771                         return;
772                 }
773 
774                 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
775 
776                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
777                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
778                         memcpy(skb_put(hcp_skb, msg_len),
779                                frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
780                                msg_len);
781                 }
782 
783                 skb_queue_purge(&hdev->rx_hcp_frags);
784         } else {
785                 packet->header &= NFC_HCI_FRAGMENT;
786                 hcp_skb = skb;
787         }
788 
789         /* if this is a response, dispatch immediately to
790          * unblock waiting cmd context. Otherwise, enqueue to dispatch
791          * in separate context where handler can also execute command.
792          */
793         packet = (struct hcp_packet *)hcp_skb->data;
794         type = HCP_MSG_GET_TYPE(packet->message.header);
795         if (type == NFC_HCI_HCP_RESPONSE) {
796                 pipe = packet->header;
797                 instruction = HCP_MSG_GET_CMD(packet->message.header);
798                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
799                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
800                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
801         } else {
802                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
803                 schedule_work(&hdev->msg_rx_work);
804         }
805 }
806 
807 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
808 {
809         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
810 
811         if (!hdev->ops->fw_download)
812                 return -ENOTSUPP;
813 
814         return hdev->ops->fw_download(hdev, firmware_name);
815 }
816 
817 static struct nfc_ops hci_nfc_ops = {
818         .dev_up = hci_dev_up,
819         .dev_down = hci_dev_down,
820         .start_poll = hci_start_poll,
821         .stop_poll = hci_stop_poll,
822         .dep_link_up = hci_dep_link_up,
823         .dep_link_down = hci_dep_link_down,
824         .activate_target = hci_activate_target,
825         .deactivate_target = hci_deactivate_target,
826         .im_transceive = hci_transceive,
827         .tm_send = hci_tm_send,
828         .check_presence = hci_check_presence,
829         .fw_download = hci_fw_download,
830         .discover_se = hci_discover_se,
831         .enable_se = hci_enable_se,
832         .disable_se = hci_disable_se,
833 };
834 
835 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
836                                             struct nfc_hci_init_data *init_data,
837                                             unsigned long quirks,
838                                             u32 protocols,
839                                             const char *llc_name,
840                                             int tx_headroom,
841                                             int tx_tailroom,
842                                             int max_link_payload)
843 {
844         struct nfc_hci_dev *hdev;
845 
846         if (ops->xmit == NULL)
847                 return NULL;
848 
849         if (protocols == 0)
850                 return NULL;
851 
852         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
853         if (hdev == NULL)
854                 return NULL;
855 
856         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
857                                      nfc_hci_recv_from_llc, tx_headroom,
858                                      tx_tailroom, nfc_hci_llc_failure);
859         if (hdev->llc == NULL) {
860                 kfree(hdev);
861                 return NULL;
862         }
863 
864         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
865                                          tx_headroom + HCI_CMDS_HEADROOM,
866                                          tx_tailroom);
867         if (!hdev->ndev) {
868                 nfc_llc_free(hdev->llc);
869                 kfree(hdev);
870                 return NULL;
871         }
872 
873         hdev->ops = ops;
874         hdev->max_data_link_payload = max_link_payload;
875         hdev->init_data = *init_data;
876 
877         nfc_set_drvdata(hdev->ndev, hdev);
878 
879         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
880 
881         hdev->quirks = quirks;
882 
883         return hdev;
884 }
885 EXPORT_SYMBOL(nfc_hci_allocate_device);
886 
887 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
888 {
889         nfc_free_device(hdev->ndev);
890         nfc_llc_free(hdev->llc);
891         kfree(hdev);
892 }
893 EXPORT_SYMBOL(nfc_hci_free_device);
894 
895 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
896 {
897         mutex_init(&hdev->msg_tx_mutex);
898 
899         INIT_LIST_HEAD(&hdev->msg_tx_queue);
900 
901         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
902 
903         init_timer(&hdev->cmd_timer);
904         hdev->cmd_timer.data = (unsigned long)hdev;
905         hdev->cmd_timer.function = nfc_hci_cmd_timeout;
906 
907         skb_queue_head_init(&hdev->rx_hcp_frags);
908 
909         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
910 
911         skb_queue_head_init(&hdev->msg_rx_queue);
912 
913         return nfc_register_device(hdev->ndev);
914 }
915 EXPORT_SYMBOL(nfc_hci_register_device);
916 
917 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
918 {
919         struct hci_msg *msg, *n;
920 
921         mutex_lock(&hdev->msg_tx_mutex);
922 
923         if (hdev->cmd_pending_msg) {
924                 if (hdev->cmd_pending_msg->cb)
925                         hdev->cmd_pending_msg->cb(
926                                              hdev->cmd_pending_msg->cb_context,
927                                              NULL, -ESHUTDOWN);
928                 kfree(hdev->cmd_pending_msg);
929                 hdev->cmd_pending_msg = NULL;
930         }
931 
932         hdev->shutting_down = true;
933 
934         mutex_unlock(&hdev->msg_tx_mutex);
935 
936         del_timer_sync(&hdev->cmd_timer);
937         cancel_work_sync(&hdev->msg_tx_work);
938 
939         cancel_work_sync(&hdev->msg_rx_work);
940 
941         nfc_unregister_device(hdev->ndev);
942 
943         skb_queue_purge(&hdev->rx_hcp_frags);
944         skb_queue_purge(&hdev->msg_rx_queue);
945 
946         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
947                 list_del(&msg->msg_l);
948                 skb_queue_purge(&msg->msg_frags);
949                 kfree(msg);
950         }
951 }
952 EXPORT_SYMBOL(nfc_hci_unregister_device);
953 
954 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
955 {
956         hdev->clientdata = clientdata;
957 }
958 EXPORT_SYMBOL(nfc_hci_set_clientdata);
959 
960 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
961 {
962         return hdev->clientdata;
963 }
964 EXPORT_SYMBOL(nfc_hci_get_clientdata);
965 
966 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
967 {
968         nfc_hci_failure(hdev, err);
969 }
970 EXPORT_SYMBOL(nfc_hci_driver_failure);
971 
972 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
973 {
974         nfc_llc_rcv_from_drv(hdev->llc, skb);
975 }
976 EXPORT_SYMBOL(nfc_hci_recv_frame);
977 
978 static int __init nfc_hci_init(void)
979 {
980         return nfc_llc_init();
981 }
982 
983 static void __exit nfc_hci_exit(void)
984 {
985         nfc_llc_exit();
986 }
987 
988 subsys_initcall(nfc_hci_init);
989 module_exit(nfc_hci_exit);
990 
991 MODULE_LICENSE("GPL");
992 MODULE_DESCRIPTION("NFC HCI Core");
993 

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