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

Version: ~ [ linux-5.8-rc5 ] ~ [ linux-5.7.8 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.51 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.132 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.188 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.230 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.230 ] ~ [ 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         int r = 0;
171         u8 gate = nfc_hci_pipe2gate(hdev, pipe);
172         u8 local_gate, new_pipe;
173         u8 gate_opened = 0x00;
174 
175         pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
176 
177         switch (cmd) {
178         case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
179                 if (skb->len != 5) {
180                         r = -EPROTO;
181                         break;
182                 }
183 
184                 local_gate = skb->data[3];
185                 new_pipe = skb->data[4];
186                 nfc_hci_send_response(hdev, gate, NFC_HCI_ANY_OK, NULL, 0);
187 
188                 /* save the new created pipe and bind with local gate,
189                  * the description for skb->data[3] is destination gate id
190                  * but since we received this cmd from host controller, we
191                  * are the destination and it is our local gate
192                  */
193                 hdev->gate2pipe[local_gate] = new_pipe;
194                 break;
195         case NFC_HCI_ANY_OPEN_PIPE:
196                 /* if the pipe is already created, we allow remote host to
197                  * open it
198                  */
199                 if (gate != 0xff)
200                         nfc_hci_send_response(hdev, gate, NFC_HCI_ANY_OK,
201                                               &gate_opened, 1);
202                 break;
203         case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
204                 nfc_hci_send_response(hdev, gate, NFC_HCI_ANY_OK, NULL, 0);
205                 break;
206         default:
207                 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
208                 r = -EINVAL;
209                 break;
210         }
211 
212         kfree_skb(skb);
213 }
214 
215 u32 nfc_hci_sak_to_protocol(u8 sak)
216 {
217         switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
218         case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
219                 return NFC_PROTO_MIFARE_MASK;
220         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
221                 return NFC_PROTO_ISO14443_MASK;
222         case NFC_HCI_TYPE_A_SEL_PROT_DEP:
223                 return NFC_PROTO_NFC_DEP_MASK;
224         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
225                 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
226         default:
227                 return 0xffffffff;
228         }
229 }
230 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
231 
232 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
233 {
234         struct nfc_target *targets;
235         struct sk_buff *atqa_skb = NULL;
236         struct sk_buff *sak_skb = NULL;
237         struct sk_buff *uid_skb = NULL;
238         int r;
239 
240         pr_debug("from gate %d\n", gate);
241 
242         targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
243         if (targets == NULL)
244                 return -ENOMEM;
245 
246         switch (gate) {
247         case NFC_HCI_RF_READER_A_GATE:
248                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
249                                       NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
250                 if (r < 0)
251                         goto exit;
252 
253                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
254                                       NFC_HCI_RF_READER_A_SAK, &sak_skb);
255                 if (r < 0)
256                         goto exit;
257 
258                 if (atqa_skb->len != 2 || sak_skb->len != 1) {
259                         r = -EPROTO;
260                         goto exit;
261                 }
262 
263                 targets->supported_protocols =
264                                 nfc_hci_sak_to_protocol(sak_skb->data[0]);
265                 if (targets->supported_protocols == 0xffffffff) {
266                         r = -EPROTO;
267                         goto exit;
268                 }
269 
270                 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
271                 targets->sel_res = sak_skb->data[0];
272 
273                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
274                                       NFC_HCI_RF_READER_A_UID, &uid_skb);
275                 if (r < 0)
276                         goto exit;
277 
278                 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
279                         r = -EPROTO;
280                         goto exit;
281                 }
282 
283                 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
284                 targets->nfcid1_len = uid_skb->len;
285 
286                 if (hdev->ops->complete_target_discovered) {
287                         r = hdev->ops->complete_target_discovered(hdev, gate,
288                                                                   targets);
289                         if (r < 0)
290                                 goto exit;
291                 }
292                 break;
293         case NFC_HCI_RF_READER_B_GATE:
294                 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
295                 break;
296         default:
297                 if (hdev->ops->target_from_gate)
298                         r = hdev->ops->target_from_gate(hdev, gate, targets);
299                 else
300                         r = -EPROTO;
301                 if (r < 0)
302                         goto exit;
303 
304                 if (hdev->ops->complete_target_discovered) {
305                         r = hdev->ops->complete_target_discovered(hdev, gate,
306                                                                   targets);
307                         if (r < 0)
308                                 goto exit;
309                 }
310                 break;
311         }
312 
313         /* if driver set the new gate, we will skip the old one */
314         if (targets->hci_reader_gate == 0x00)
315                 targets->hci_reader_gate = gate;
316 
317         r = nfc_targets_found(hdev->ndev, targets, 1);
318 
319 exit:
320         kfree(targets);
321         kfree_skb(atqa_skb);
322         kfree_skb(sak_skb);
323         kfree_skb(uid_skb);
324 
325         return r;
326 }
327 EXPORT_SYMBOL(nfc_hci_target_discovered);
328 
329 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
330                             struct sk_buff *skb)
331 {
332         int r = 0;
333         u8 gate = nfc_hci_pipe2gate(hdev, pipe);
334 
335         if (gate == 0xff) {
336                 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
337                 goto exit;
338         }
339 
340         if (hdev->ops->event_received) {
341                 r = hdev->ops->event_received(hdev, gate, event, skb);
342                 if (r <= 0)
343                         goto exit_noskb;
344         }
345 
346         switch (event) {
347         case NFC_HCI_EVT_TARGET_DISCOVERED:
348                 if (skb->len < 1) {     /* no status data? */
349                         r = -EPROTO;
350                         goto exit;
351                 }
352 
353                 if (skb->data[0] == 3) {
354                         /* TODO: Multiple targets in field, none activated
355                          * poll is supposedly stopped, but there is no
356                          * single target to activate, so nothing to report
357                          * up.
358                          * if we need to restart poll, we must save the
359                          * protocols from the initial poll and reuse here.
360                          */
361                 }
362 
363                 if (skb->data[0] != 0) {
364                         r = -EPROTO;
365                         goto exit;
366                 }
367 
368                 r = nfc_hci_target_discovered(hdev, gate);
369                 break;
370         default:
371                 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
372                 r = -EINVAL;
373                 break;
374         }
375 
376 exit:
377         kfree_skb(skb);
378 
379 exit_noskb:
380         if (r)
381                 nfc_hci_driver_failure(hdev, r);
382 }
383 
384 static void nfc_hci_cmd_timeout(unsigned long data)
385 {
386         struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
387 
388         schedule_work(&hdev->msg_tx_work);
389 }
390 
391 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
392                                  struct nfc_hci_gate *gates)
393 {
394         int r;
395         while (gate_count--) {
396                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
397                                          gates->gate, gates->pipe);
398                 if (r < 0)
399                         return r;
400                 gates++;
401         }
402 
403         return 0;
404 }
405 
406 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
407 {
408         struct sk_buff *skb = NULL;
409         int r;
410 
411         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
412                 return -EPROTO;
413 
414         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
415                                  hdev->init_data.gates[0].gate,
416                                  hdev->init_data.gates[0].pipe);
417         if (r < 0)
418                 goto exit;
419 
420         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
421                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
422         if (r < 0)
423                 goto disconnect_all;
424 
425         if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
426                 (memcmp(hdev->init_data.session_id, skb->data,
427                            skb->len) == 0) && hdev->ops->load_session) {
428                 /* Restore gate<->pipe table from some proprietary location. */
429 
430                 r = hdev->ops->load_session(hdev);
431 
432                 if (r < 0)
433                         goto disconnect_all;
434         } else {
435 
436                 r = nfc_hci_disconnect_all_gates(hdev);
437                 if (r < 0)
438                         goto exit;
439 
440                 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
441                                           hdev->init_data.gates);
442                 if (r < 0)
443                         goto disconnect_all;
444 
445                 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
446                                 NFC_HCI_ADMIN_SESSION_IDENTITY,
447                                 hdev->init_data.session_id,
448                                 strlen(hdev->init_data.session_id));
449         }
450         if (r == 0)
451                 goto exit;
452 
453 disconnect_all:
454         nfc_hci_disconnect_all_gates(hdev);
455 
456 exit:
457         kfree_skb(skb);
458 
459         return r;
460 }
461 
462 static int hci_dev_version(struct nfc_hci_dev *hdev)
463 {
464         int r;
465         struct sk_buff *skb;
466 
467         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
468                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
469         if (r == -EOPNOTSUPP) {
470                 pr_info("Software/Hardware info not available\n");
471                 return 0;
472         }
473         if (r < 0)
474                 return r;
475 
476         if (skb->len != 3) {
477                 kfree_skb(skb);
478                 return -EINVAL;
479         }
480 
481         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
482         hdev->sw_patch = skb->data[0] & 0x0f;
483         hdev->sw_flashlib_major = skb->data[1];
484         hdev->sw_flashlib_minor = skb->data[2];
485 
486         kfree_skb(skb);
487 
488         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
489                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
490         if (r < 0)
491                 return r;
492 
493         if (skb->len != 3) {
494                 kfree_skb(skb);
495                 return -EINVAL;
496         }
497 
498         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
499         hdev->hw_version = skb->data[0] & 0x1f;
500         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
501         hdev->hw_software = skb->data[1] & 0x3f;
502         hdev->hw_bsid = skb->data[2];
503 
504         kfree_skb(skb);
505 
506         pr_info("SOFTWARE INFO:\n");
507         pr_info("RomLib         : %d\n", hdev->sw_romlib);
508         pr_info("Patch          : %d\n", hdev->sw_patch);
509         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
510         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
511         pr_info("HARDWARE INFO:\n");
512         pr_info("Derivative     : %d\n", hdev->hw_derivative);
513         pr_info("HW Version     : %d\n", hdev->hw_version);
514         pr_info("#MPW           : %d\n", hdev->hw_mpw);
515         pr_info("Software       : %d\n", hdev->hw_software);
516         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
517 
518         return 0;
519 }
520 
521 static int hci_dev_up(struct nfc_dev *nfc_dev)
522 {
523         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
524         int r = 0;
525 
526         if (hdev->ops->open) {
527                 r = hdev->ops->open(hdev);
528                 if (r < 0)
529                         return r;
530         }
531 
532         r = nfc_llc_start(hdev->llc);
533         if (r < 0)
534                 goto exit_close;
535 
536         r = hci_dev_session_init(hdev);
537         if (r < 0)
538                 goto exit_llc;
539 
540         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
541                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
542         if (r < 0)
543                 goto exit_llc;
544 
545         if (hdev->ops->hci_ready) {
546                 r = hdev->ops->hci_ready(hdev);
547                 if (r < 0)
548                         goto exit_llc;
549         }
550 
551         r = hci_dev_version(hdev);
552         if (r < 0)
553                 goto exit_llc;
554 
555         return 0;
556 
557 exit_llc:
558         nfc_llc_stop(hdev->llc);
559 
560 exit_close:
561         if (hdev->ops->close)
562                 hdev->ops->close(hdev);
563 
564         return r;
565 }
566 
567 static int hci_dev_down(struct nfc_dev *nfc_dev)
568 {
569         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
570 
571         nfc_llc_stop(hdev->llc);
572 
573         if (hdev->ops->close)
574                 hdev->ops->close(hdev);
575 
576         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
577 
578         return 0;
579 }
580 
581 static int hci_start_poll(struct nfc_dev *nfc_dev,
582                           u32 im_protocols, u32 tm_protocols)
583 {
584         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
585 
586         if (hdev->ops->start_poll)
587                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
588         else
589                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
590                                           NFC_HCI_EVT_READER_REQUESTED,
591                                           NULL, 0);
592 }
593 
594 static void hci_stop_poll(struct nfc_dev *nfc_dev)
595 {
596         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
597 
598         if (hdev->ops->stop_poll)
599                 hdev->ops->stop_poll(hdev);
600         else
601                 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
602                                    NFC_HCI_EVT_END_OPERATION, NULL, 0);
603 }
604 
605 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
606                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
607 {
608         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
609 
610         if (!hdev->ops->dep_link_up)
611                 return 0;
612 
613         return hdev->ops->dep_link_up(hdev, target, comm_mode,
614                                       gb, gb_len);
615 }
616 
617 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
618 {
619         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
620 
621         if (!hdev->ops->dep_link_down)
622                 return 0;
623 
624         return hdev->ops->dep_link_down(hdev);
625 }
626 
627 static int hci_activate_target(struct nfc_dev *nfc_dev,
628                                struct nfc_target *target, u32 protocol)
629 {
630         return 0;
631 }
632 
633 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
634                                   struct nfc_target *target)
635 {
636 }
637 
638 #define HCI_CB_TYPE_TRANSCEIVE 1
639 
640 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
641 {
642         struct nfc_hci_dev *hdev = context;
643 
644         switch (hdev->async_cb_type) {
645         case HCI_CB_TYPE_TRANSCEIVE:
646                 /*
647                  * TODO: Check RF Error indicator to make sure data is valid.
648                  * It seems that HCI cmd can complete without error, but data
649                  * can be invalid if an RF error occured? Ignore for now.
650                  */
651                 if (err == 0)
652                         skb_trim(skb, skb->len - 1); /* RF Err ind */
653 
654                 hdev->async_cb(hdev->async_cb_context, skb, err);
655                 break;
656         default:
657                 if (err == 0)
658                         kfree_skb(skb);
659                 break;
660         }
661 }
662 
663 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
664                           struct sk_buff *skb, data_exchange_cb_t cb,
665                           void *cb_context)
666 {
667         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
668         int r;
669 
670         pr_debug("target_idx=%d\n", target->idx);
671 
672         switch (target->hci_reader_gate) {
673         case NFC_HCI_RF_READER_A_GATE:
674         case NFC_HCI_RF_READER_B_GATE:
675                 if (hdev->ops->im_transceive) {
676                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
677                                                      cb_context);
678                         if (r <= 0)     /* handled */
679                                 break;
680                 }
681 
682                 *skb_push(skb, 1) = 0;  /* CTR, see spec:10.2.2.1 */
683 
684                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
685                 hdev->async_cb = cb;
686                 hdev->async_cb_context = cb_context;
687 
688                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
689                                            NFC_HCI_WR_XCHG_DATA, skb->data,
690                                            skb->len, hci_transceive_cb, hdev);
691                 break;
692         default:
693                 if (hdev->ops->im_transceive) {
694                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
695                                                      cb_context);
696                         if (r == 1)
697                                 r = -ENOTSUPP;
698                 } else {
699                         r = -ENOTSUPP;
700                 }
701                 break;
702         }
703 
704         kfree_skb(skb);
705 
706         return r;
707 }
708 
709 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
710 {
711         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
712 
713         if (!hdev->ops->tm_send) {
714                 kfree_skb(skb);
715                 return -ENOTSUPP;
716         }
717 
718         return hdev->ops->tm_send(hdev, skb);
719 }
720 
721 static int hci_check_presence(struct nfc_dev *nfc_dev,
722                               struct nfc_target *target)
723 {
724         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
725 
726         if (!hdev->ops->check_presence)
727                 return 0;
728 
729         return hdev->ops->check_presence(hdev, target);
730 }
731 
732 static int hci_discover_se(struct nfc_dev *nfc_dev)
733 {
734         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
735 
736         if (hdev->ops->discover_se)
737                 return hdev->ops->discover_se(hdev);
738 
739         return 0;
740 }
741 
742 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
743 {
744         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
745 
746         if (hdev->ops->enable_se)
747                 return hdev->ops->enable_se(hdev, se_idx);
748 
749         return 0;
750 }
751 
752 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
753 {
754         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
755 
756         if (hdev->ops->disable_se)
757                 return hdev->ops->disable_se(hdev, se_idx);
758 
759         return 0;
760 }
761 
762 static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
763                      u8 *apdu, size_t apdu_length,
764                      se_io_cb_t cb, void *cb_context)
765 {
766         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
767 
768         if (hdev->ops->se_io)
769                 return hdev->ops->se_io(hdev, se_idx, apdu,
770                                         apdu_length, cb, cb_context);
771 
772         return 0;
773 }
774 
775 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
776 {
777         mutex_lock(&hdev->msg_tx_mutex);
778 
779         if (hdev->cmd_pending_msg == NULL) {
780                 nfc_driver_failure(hdev->ndev, err);
781                 goto exit;
782         }
783 
784         __nfc_hci_cmd_completion(hdev, err, NULL);
785 
786 exit:
787         mutex_unlock(&hdev->msg_tx_mutex);
788 }
789 
790 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
791 {
792         nfc_hci_failure(hdev, err);
793 }
794 
795 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
796 {
797         struct hcp_packet *packet;
798         u8 type;
799         u8 instruction;
800         struct sk_buff *hcp_skb;
801         u8 pipe;
802         struct sk_buff *frag_skb;
803         int msg_len;
804 
805         packet = (struct hcp_packet *)skb->data;
806         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
807                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
808                 return;
809         }
810 
811         /* it's the last fragment. Does it need re-aggregation? */
812         if (skb_queue_len(&hdev->rx_hcp_frags)) {
813                 pipe = packet->header & NFC_HCI_FRAGMENT;
814                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
815 
816                 msg_len = 0;
817                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
818                         msg_len += (frag_skb->len -
819                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
820                 }
821 
822                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
823                                              msg_len, GFP_KERNEL);
824                 if (hcp_skb == NULL) {
825                         nfc_hci_failure(hdev, -ENOMEM);
826                         return;
827                 }
828 
829                 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
830 
831                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
832                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
833                         memcpy(skb_put(hcp_skb, msg_len),
834                                frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
835                                msg_len);
836                 }
837 
838                 skb_queue_purge(&hdev->rx_hcp_frags);
839         } else {
840                 packet->header &= NFC_HCI_FRAGMENT;
841                 hcp_skb = skb;
842         }
843 
844         /* if this is a response, dispatch immediately to
845          * unblock waiting cmd context. Otherwise, enqueue to dispatch
846          * in separate context where handler can also execute command.
847          */
848         packet = (struct hcp_packet *)hcp_skb->data;
849         type = HCP_MSG_GET_TYPE(packet->message.header);
850         if (type == NFC_HCI_HCP_RESPONSE) {
851                 pipe = packet->header;
852                 instruction = HCP_MSG_GET_CMD(packet->message.header);
853                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
854                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
855                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
856         } else {
857                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
858                 schedule_work(&hdev->msg_rx_work);
859         }
860 }
861 
862 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
863 {
864         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
865 
866         if (!hdev->ops->fw_download)
867                 return -ENOTSUPP;
868 
869         return hdev->ops->fw_download(hdev, firmware_name);
870 }
871 
872 static struct nfc_ops hci_nfc_ops = {
873         .dev_up = hci_dev_up,
874         .dev_down = hci_dev_down,
875         .start_poll = hci_start_poll,
876         .stop_poll = hci_stop_poll,
877         .dep_link_up = hci_dep_link_up,
878         .dep_link_down = hci_dep_link_down,
879         .activate_target = hci_activate_target,
880         .deactivate_target = hci_deactivate_target,
881         .im_transceive = hci_transceive,
882         .tm_send = hci_tm_send,
883         .check_presence = hci_check_presence,
884         .fw_download = hci_fw_download,
885         .discover_se = hci_discover_se,
886         .enable_se = hci_enable_se,
887         .disable_se = hci_disable_se,
888         .se_io = hci_se_io,
889 };
890 
891 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
892                                             struct nfc_hci_init_data *init_data,
893                                             unsigned long quirks,
894                                             u32 protocols,
895                                             const char *llc_name,
896                                             int tx_headroom,
897                                             int tx_tailroom,
898                                             int max_link_payload)
899 {
900         struct nfc_hci_dev *hdev;
901 
902         if (ops->xmit == NULL)
903                 return NULL;
904 
905         if (protocols == 0)
906                 return NULL;
907 
908         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
909         if (hdev == NULL)
910                 return NULL;
911 
912         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
913                                      nfc_hci_recv_from_llc, tx_headroom,
914                                      tx_tailroom, nfc_hci_llc_failure);
915         if (hdev->llc == NULL) {
916                 kfree(hdev);
917                 return NULL;
918         }
919 
920         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
921                                          tx_headroom + HCI_CMDS_HEADROOM,
922                                          tx_tailroom);
923         if (!hdev->ndev) {
924                 nfc_llc_free(hdev->llc);
925                 kfree(hdev);
926                 return NULL;
927         }
928 
929         hdev->ops = ops;
930         hdev->max_data_link_payload = max_link_payload;
931         hdev->init_data = *init_data;
932 
933         nfc_set_drvdata(hdev->ndev, hdev);
934 
935         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
936 
937         hdev->quirks = quirks;
938 
939         return hdev;
940 }
941 EXPORT_SYMBOL(nfc_hci_allocate_device);
942 
943 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
944 {
945         nfc_free_device(hdev->ndev);
946         nfc_llc_free(hdev->llc);
947         kfree(hdev);
948 }
949 EXPORT_SYMBOL(nfc_hci_free_device);
950 
951 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
952 {
953         mutex_init(&hdev->msg_tx_mutex);
954 
955         INIT_LIST_HEAD(&hdev->msg_tx_queue);
956 
957         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
958 
959         init_timer(&hdev->cmd_timer);
960         hdev->cmd_timer.data = (unsigned long)hdev;
961         hdev->cmd_timer.function = nfc_hci_cmd_timeout;
962 
963         skb_queue_head_init(&hdev->rx_hcp_frags);
964 
965         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
966 
967         skb_queue_head_init(&hdev->msg_rx_queue);
968 
969         return nfc_register_device(hdev->ndev);
970 }
971 EXPORT_SYMBOL(nfc_hci_register_device);
972 
973 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
974 {
975         struct hci_msg *msg, *n;
976 
977         mutex_lock(&hdev->msg_tx_mutex);
978 
979         if (hdev->cmd_pending_msg) {
980                 if (hdev->cmd_pending_msg->cb)
981                         hdev->cmd_pending_msg->cb(
982                                              hdev->cmd_pending_msg->cb_context,
983                                              NULL, -ESHUTDOWN);
984                 kfree(hdev->cmd_pending_msg);
985                 hdev->cmd_pending_msg = NULL;
986         }
987 
988         hdev->shutting_down = true;
989 
990         mutex_unlock(&hdev->msg_tx_mutex);
991 
992         del_timer_sync(&hdev->cmd_timer);
993         cancel_work_sync(&hdev->msg_tx_work);
994 
995         cancel_work_sync(&hdev->msg_rx_work);
996 
997         nfc_unregister_device(hdev->ndev);
998 
999         skb_queue_purge(&hdev->rx_hcp_frags);
1000         skb_queue_purge(&hdev->msg_rx_queue);
1001 
1002         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1003                 list_del(&msg->msg_l);
1004                 skb_queue_purge(&msg->msg_frags);
1005                 kfree(msg);
1006         }
1007 }
1008 EXPORT_SYMBOL(nfc_hci_unregister_device);
1009 
1010 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1011 {
1012         hdev->clientdata = clientdata;
1013 }
1014 EXPORT_SYMBOL(nfc_hci_set_clientdata);
1015 
1016 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1017 {
1018         return hdev->clientdata;
1019 }
1020 EXPORT_SYMBOL(nfc_hci_get_clientdata);
1021 
1022 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1023 {
1024         nfc_hci_failure(hdev, err);
1025 }
1026 EXPORT_SYMBOL(nfc_hci_driver_failure);
1027 
1028 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1029 {
1030         nfc_llc_rcv_from_drv(hdev->llc, skb);
1031 }
1032 EXPORT_SYMBOL(nfc_hci_recv_frame);
1033 
1034 static int __init nfc_hci_init(void)
1035 {
1036         return nfc_llc_init();
1037 }
1038 
1039 static void __exit nfc_hci_exit(void)
1040 {
1041         nfc_llc_exit();
1042 }
1043 
1044 subsys_initcall(nfc_hci_init);
1045 module_exit(nfc_hci_exit);
1046 
1047 MODULE_LICENSE("GPL");
1048 MODULE_DESCRIPTION("NFC HCI Core");
1049 

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