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

Version: ~ [ linux-5.11-rc3 ] ~ [ linux-5.10.7 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.89 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.167 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.215 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.251 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.251 ] ~ [ 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 void nfc_hci_reset_pipes(struct nfc_hci_dev *hdev)
 50 {
 51         int i = 0;
 52 
 53         for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
 54                 hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
 55                 hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
 56         }
 57         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 58 }
 59 EXPORT_SYMBOL(nfc_hci_reset_pipes);
 60 
 61 void nfc_hci_reset_pipes_per_host(struct nfc_hci_dev *hdev, u8 host)
 62 {
 63         int i = 0;
 64 
 65         for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
 66                 if (hdev->pipes[i].dest_host != host)
 67                         continue;
 68 
 69                 hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
 70                 hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
 71         }
 72 }
 73 EXPORT_SYMBOL(nfc_hci_reset_pipes_per_host);
 74 
 75 static void nfc_hci_msg_tx_work(struct work_struct *work)
 76 {
 77         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
 78                                                 msg_tx_work);
 79         struct hci_msg *msg;
 80         struct sk_buff *skb;
 81         int r = 0;
 82 
 83         mutex_lock(&hdev->msg_tx_mutex);
 84         if (hdev->shutting_down)
 85                 goto exit;
 86 
 87         if (hdev->cmd_pending_msg) {
 88                 if (timer_pending(&hdev->cmd_timer) == 0) {
 89                         if (hdev->cmd_pending_msg->cb)
 90                                 hdev->cmd_pending_msg->cb(hdev->
 91                                                           cmd_pending_msg->
 92                                                           cb_context,
 93                                                           NULL,
 94                                                           -ETIME);
 95                         kfree(hdev->cmd_pending_msg);
 96                         hdev->cmd_pending_msg = NULL;
 97                 } else {
 98                         goto exit;
 99                 }
100         }
101 
102 next_msg:
103         if (list_empty(&hdev->msg_tx_queue))
104                 goto exit;
105 
106         msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
107         list_del(&msg->msg_l);
108 
109         pr_debug("msg_tx_queue has a cmd to send\n");
110         while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
111                 r = nfc_llc_xmit_from_hci(hdev->llc, skb);
112                 if (r < 0) {
113                         kfree_skb(skb);
114                         skb_queue_purge(&msg->msg_frags);
115                         if (msg->cb)
116                                 msg->cb(msg->cb_context, NULL, r);
117                         kfree(msg);
118                         break;
119                 }
120         }
121 
122         if (r)
123                 goto next_msg;
124 
125         if (msg->wait_response == false) {
126                 kfree(msg);
127                 goto next_msg;
128         }
129 
130         hdev->cmd_pending_msg = msg;
131         mod_timer(&hdev->cmd_timer, jiffies +
132                   msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
133 
134 exit:
135         mutex_unlock(&hdev->msg_tx_mutex);
136 }
137 
138 static void nfc_hci_msg_rx_work(struct work_struct *work)
139 {
140         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
141                                                 msg_rx_work);
142         struct sk_buff *skb;
143         struct hcp_message *message;
144         u8 pipe;
145         u8 type;
146         u8 instruction;
147 
148         while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
149                 pipe = skb->data[0];
150                 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
151                 message = (struct hcp_message *)skb->data;
152                 type = HCP_MSG_GET_TYPE(message->header);
153                 instruction = HCP_MSG_GET_CMD(message->header);
154                 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
155 
156                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
157         }
158 }
159 
160 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
161                                      struct sk_buff *skb)
162 {
163         del_timer_sync(&hdev->cmd_timer);
164 
165         if (hdev->cmd_pending_msg->cb)
166                 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
167                                           skb, err);
168         else
169                 kfree_skb(skb);
170 
171         kfree(hdev->cmd_pending_msg);
172         hdev->cmd_pending_msg = NULL;
173 
174         schedule_work(&hdev->msg_tx_work);
175 }
176 
177 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
178                            struct sk_buff *skb)
179 {
180         mutex_lock(&hdev->msg_tx_mutex);
181 
182         if (hdev->cmd_pending_msg == NULL) {
183                 kfree_skb(skb);
184                 goto exit;
185         }
186 
187         __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
188 
189 exit:
190         mutex_unlock(&hdev->msg_tx_mutex);
191 }
192 
193 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
194                           struct sk_buff *skb)
195 {
196         u8 gate = hdev->pipes[pipe].gate;
197         u8 status = NFC_HCI_ANY_OK;
198         struct hci_create_pipe_resp *create_info;
199         struct hci_delete_pipe_noti *delete_info;
200         struct hci_all_pipe_cleared_noti *cleared_info;
201 
202         pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);
203 
204         switch (cmd) {
205         case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
206                 if (skb->len != 5) {
207                         status = NFC_HCI_ANY_E_NOK;
208                         goto exit;
209                 }
210                 create_info = (struct hci_create_pipe_resp *)skb->data;
211 
212                 if (create_info->pipe >= NFC_HCI_MAX_PIPES) {
213                         status = NFC_HCI_ANY_E_NOK;
214                         goto exit;
215                 }
216 
217                 /* Save the new created pipe and bind with local gate,
218                  * the description for skb->data[3] is destination gate id
219                  * but since we received this cmd from host controller, we
220                  * are the destination and it is our local gate
221                  */
222                 hdev->gate2pipe[create_info->dest_gate] = create_info->pipe;
223                 hdev->pipes[create_info->pipe].gate = create_info->dest_gate;
224                 hdev->pipes[create_info->pipe].dest_host =
225                                                         create_info->src_host;
226                 break;
227         case NFC_HCI_ANY_OPEN_PIPE:
228                 if (gate == NFC_HCI_INVALID_GATE) {
229                         status = NFC_HCI_ANY_E_NOK;
230                         goto exit;
231                 }
232                 break;
233         case NFC_HCI_ADM_NOTIFY_PIPE_DELETED:
234                 if (skb->len != 1) {
235                         status = NFC_HCI_ANY_E_NOK;
236                         goto exit;
237                 }
238                 delete_info = (struct hci_delete_pipe_noti *)skb->data;
239 
240                 if (delete_info->pipe >= NFC_HCI_MAX_PIPES) {
241                         status = NFC_HCI_ANY_E_NOK;
242                         goto exit;
243                 }
244 
245                 hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
246                 hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
247                 break;
248         case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
249                 if (skb->len != 1) {
250                         status = NFC_HCI_ANY_E_NOK;
251                         goto exit;
252                 }
253                 cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
254 
255                 nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
256                 break;
257         default:
258                 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
259                 break;
260         }
261 
262         if (hdev->ops->cmd_received)
263                 hdev->ops->cmd_received(hdev, pipe, cmd, skb);
264 
265 exit:
266         nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
267                                status, NULL, 0, NULL, NULL, 0);
268 
269         kfree_skb(skb);
270 }
271 
272 u32 nfc_hci_sak_to_protocol(u8 sak)
273 {
274         switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
275         case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
276                 return NFC_PROTO_MIFARE_MASK;
277         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
278                 return NFC_PROTO_ISO14443_MASK;
279         case NFC_HCI_TYPE_A_SEL_PROT_DEP:
280                 return NFC_PROTO_NFC_DEP_MASK;
281         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
282                 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
283         default:
284                 return 0xffffffff;
285         }
286 }
287 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
288 
289 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
290 {
291         struct nfc_target *targets;
292         struct sk_buff *atqa_skb = NULL;
293         struct sk_buff *sak_skb = NULL;
294         struct sk_buff *uid_skb = NULL;
295         int r;
296 
297         pr_debug("from gate %d\n", gate);
298 
299         targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
300         if (targets == NULL)
301                 return -ENOMEM;
302 
303         switch (gate) {
304         case NFC_HCI_RF_READER_A_GATE:
305                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
306                                       NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
307                 if (r < 0)
308                         goto exit;
309 
310                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
311                                       NFC_HCI_RF_READER_A_SAK, &sak_skb);
312                 if (r < 0)
313                         goto exit;
314 
315                 if (atqa_skb->len != 2 || sak_skb->len != 1) {
316                         r = -EPROTO;
317                         goto exit;
318                 }
319 
320                 targets->supported_protocols =
321                                 nfc_hci_sak_to_protocol(sak_skb->data[0]);
322                 if (targets->supported_protocols == 0xffffffff) {
323                         r = -EPROTO;
324                         goto exit;
325                 }
326 
327                 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
328                 targets->sel_res = sak_skb->data[0];
329 
330                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
331                                       NFC_HCI_RF_READER_A_UID, &uid_skb);
332                 if (r < 0)
333                         goto exit;
334 
335                 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
336                         r = -EPROTO;
337                         goto exit;
338                 }
339 
340                 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
341                 targets->nfcid1_len = uid_skb->len;
342 
343                 if (hdev->ops->complete_target_discovered) {
344                         r = hdev->ops->complete_target_discovered(hdev, gate,
345                                                                   targets);
346                         if (r < 0)
347                                 goto exit;
348                 }
349                 break;
350         case NFC_HCI_RF_READER_B_GATE:
351                 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
352                 break;
353         default:
354                 if (hdev->ops->target_from_gate)
355                         r = hdev->ops->target_from_gate(hdev, gate, targets);
356                 else
357                         r = -EPROTO;
358                 if (r < 0)
359                         goto exit;
360 
361                 if (hdev->ops->complete_target_discovered) {
362                         r = hdev->ops->complete_target_discovered(hdev, gate,
363                                                                   targets);
364                         if (r < 0)
365                                 goto exit;
366                 }
367                 break;
368         }
369 
370         /* if driver set the new gate, we will skip the old one */
371         if (targets->hci_reader_gate == 0x00)
372                 targets->hci_reader_gate = gate;
373 
374         r = nfc_targets_found(hdev->ndev, targets, 1);
375 
376 exit:
377         kfree(targets);
378         kfree_skb(atqa_skb);
379         kfree_skb(sak_skb);
380         kfree_skb(uid_skb);
381 
382         return r;
383 }
384 EXPORT_SYMBOL(nfc_hci_target_discovered);
385 
386 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
387                             struct sk_buff *skb)
388 {
389         int r = 0;
390         u8 gate = hdev->pipes[pipe].gate;
391 
392         if (gate == NFC_HCI_INVALID_GATE) {
393                 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
394                 goto exit;
395         }
396 
397         if (hdev->ops->event_received) {
398                 r = hdev->ops->event_received(hdev, pipe, event, skb);
399                 if (r <= 0)
400                         goto exit_noskb;
401         }
402 
403         switch (event) {
404         case NFC_HCI_EVT_TARGET_DISCOVERED:
405                 if (skb->len < 1) {     /* no status data? */
406                         r = -EPROTO;
407                         goto exit;
408                 }
409 
410                 if (skb->data[0] == 3) {
411                         /* TODO: Multiple targets in field, none activated
412                          * poll is supposedly stopped, but there is no
413                          * single target to activate, so nothing to report
414                          * up.
415                          * if we need to restart poll, we must save the
416                          * protocols from the initial poll and reuse here.
417                          */
418                 }
419 
420                 if (skb->data[0] != 0) {
421                         r = -EPROTO;
422                         goto exit;
423                 }
424 
425                 r = nfc_hci_target_discovered(hdev, gate);
426                 break;
427         default:
428                 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
429                 r = -EINVAL;
430                 break;
431         }
432 
433 exit:
434         kfree_skb(skb);
435 
436 exit_noskb:
437         if (r)
438                 nfc_hci_driver_failure(hdev, r);
439 }
440 
441 static void nfc_hci_cmd_timeout(struct timer_list *t)
442 {
443         struct nfc_hci_dev *hdev = from_timer(hdev, t, cmd_timer);
444 
445         schedule_work(&hdev->msg_tx_work);
446 }
447 
448 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
449                                  struct nfc_hci_gate *gates)
450 {
451         int r;
452         while (gate_count--) {
453                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
454                                          gates->gate, gates->pipe);
455                 if (r < 0)
456                         return r;
457                 gates++;
458         }
459 
460         return 0;
461 }
462 
463 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
464 {
465         struct sk_buff *skb = NULL;
466         int r;
467 
468         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
469                 return -EPROTO;
470 
471         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
472                                  hdev->init_data.gates[0].gate,
473                                  hdev->init_data.gates[0].pipe);
474         if (r < 0)
475                 goto exit;
476 
477         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
478                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
479         if (r < 0)
480                 goto disconnect_all;
481 
482         if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
483                 (memcmp(hdev->init_data.session_id, skb->data,
484                            skb->len) == 0) && hdev->ops->load_session) {
485                 /* Restore gate<->pipe table from some proprietary location. */
486 
487                 r = hdev->ops->load_session(hdev);
488 
489                 if (r < 0)
490                         goto disconnect_all;
491         } else {
492 
493                 r = nfc_hci_disconnect_all_gates(hdev);
494                 if (r < 0)
495                         goto exit;
496 
497                 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
498                                           hdev->init_data.gates);
499                 if (r < 0)
500                         goto disconnect_all;
501 
502                 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
503                                 NFC_HCI_ADMIN_SESSION_IDENTITY,
504                                 hdev->init_data.session_id,
505                                 strlen(hdev->init_data.session_id));
506         }
507         if (r == 0)
508                 goto exit;
509 
510 disconnect_all:
511         nfc_hci_disconnect_all_gates(hdev);
512 
513 exit:
514         kfree_skb(skb);
515 
516         return r;
517 }
518 
519 static int hci_dev_version(struct nfc_hci_dev *hdev)
520 {
521         int r;
522         struct sk_buff *skb;
523 
524         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
525                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
526         if (r == -EOPNOTSUPP) {
527                 pr_info("Software/Hardware info not available\n");
528                 return 0;
529         }
530         if (r < 0)
531                 return r;
532 
533         if (skb->len != 3) {
534                 kfree_skb(skb);
535                 return -EINVAL;
536         }
537 
538         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
539         hdev->sw_patch = skb->data[0] & 0x0f;
540         hdev->sw_flashlib_major = skb->data[1];
541         hdev->sw_flashlib_minor = skb->data[2];
542 
543         kfree_skb(skb);
544 
545         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
546                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
547         if (r < 0)
548                 return r;
549 
550         if (skb->len != 3) {
551                 kfree_skb(skb);
552                 return -EINVAL;
553         }
554 
555         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
556         hdev->hw_version = skb->data[0] & 0x1f;
557         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
558         hdev->hw_software = skb->data[1] & 0x3f;
559         hdev->hw_bsid = skb->data[2];
560 
561         kfree_skb(skb);
562 
563         pr_info("SOFTWARE INFO:\n");
564         pr_info("RomLib         : %d\n", hdev->sw_romlib);
565         pr_info("Patch          : %d\n", hdev->sw_patch);
566         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
567         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
568         pr_info("HARDWARE INFO:\n");
569         pr_info("Derivative     : %d\n", hdev->hw_derivative);
570         pr_info("HW Version     : %d\n", hdev->hw_version);
571         pr_info("#MPW           : %d\n", hdev->hw_mpw);
572         pr_info("Software       : %d\n", hdev->hw_software);
573         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
574 
575         return 0;
576 }
577 
578 static int hci_dev_up(struct nfc_dev *nfc_dev)
579 {
580         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
581         int r = 0;
582 
583         if (hdev->ops->open) {
584                 r = hdev->ops->open(hdev);
585                 if (r < 0)
586                         return r;
587         }
588 
589         r = nfc_llc_start(hdev->llc);
590         if (r < 0)
591                 goto exit_close;
592 
593         r = hci_dev_session_init(hdev);
594         if (r < 0)
595                 goto exit_llc;
596 
597         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
598                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
599         if (r < 0)
600                 goto exit_llc;
601 
602         if (hdev->ops->hci_ready) {
603                 r = hdev->ops->hci_ready(hdev);
604                 if (r < 0)
605                         goto exit_llc;
606         }
607 
608         r = hci_dev_version(hdev);
609         if (r < 0)
610                 goto exit_llc;
611 
612         return 0;
613 
614 exit_llc:
615         nfc_llc_stop(hdev->llc);
616 
617 exit_close:
618         if (hdev->ops->close)
619                 hdev->ops->close(hdev);
620 
621         return r;
622 }
623 
624 static int hci_dev_down(struct nfc_dev *nfc_dev)
625 {
626         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
627 
628         nfc_llc_stop(hdev->llc);
629 
630         if (hdev->ops->close)
631                 hdev->ops->close(hdev);
632 
633         nfc_hci_reset_pipes(hdev);
634 
635         return 0;
636 }
637 
638 static int hci_start_poll(struct nfc_dev *nfc_dev,
639                           u32 im_protocols, u32 tm_protocols)
640 {
641         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
642 
643         if (hdev->ops->start_poll)
644                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
645         else
646                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
647                                           NFC_HCI_EVT_READER_REQUESTED,
648                                           NULL, 0);
649 }
650 
651 static void hci_stop_poll(struct nfc_dev *nfc_dev)
652 {
653         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
654 
655         if (hdev->ops->stop_poll)
656                 hdev->ops->stop_poll(hdev);
657         else
658                 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
659                                    NFC_HCI_EVT_END_OPERATION, NULL, 0);
660 }
661 
662 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
663                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
664 {
665         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
666 
667         if (!hdev->ops->dep_link_up)
668                 return 0;
669 
670         return hdev->ops->dep_link_up(hdev, target, comm_mode,
671                                       gb, gb_len);
672 }
673 
674 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
675 {
676         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
677 
678         if (!hdev->ops->dep_link_down)
679                 return 0;
680 
681         return hdev->ops->dep_link_down(hdev);
682 }
683 
684 static int hci_activate_target(struct nfc_dev *nfc_dev,
685                                struct nfc_target *target, u32 protocol)
686 {
687         return 0;
688 }
689 
690 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
691                                   struct nfc_target *target,
692                                   u8 mode)
693 {
694 }
695 
696 #define HCI_CB_TYPE_TRANSCEIVE 1
697 
698 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
699 {
700         struct nfc_hci_dev *hdev = context;
701 
702         switch (hdev->async_cb_type) {
703         case HCI_CB_TYPE_TRANSCEIVE:
704                 /*
705                  * TODO: Check RF Error indicator to make sure data is valid.
706                  * It seems that HCI cmd can complete without error, but data
707                  * can be invalid if an RF error occured? Ignore for now.
708                  */
709                 if (err == 0)
710                         skb_trim(skb, skb->len - 1); /* RF Err ind */
711 
712                 hdev->async_cb(hdev->async_cb_context, skb, err);
713                 break;
714         default:
715                 if (err == 0)
716                         kfree_skb(skb);
717                 break;
718         }
719 }
720 
721 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
722                           struct sk_buff *skb, data_exchange_cb_t cb,
723                           void *cb_context)
724 {
725         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
726         int r;
727 
728         pr_debug("target_idx=%d\n", target->idx);
729 
730         switch (target->hci_reader_gate) {
731         case NFC_HCI_RF_READER_A_GATE:
732         case NFC_HCI_RF_READER_B_GATE:
733                 if (hdev->ops->im_transceive) {
734                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
735                                                      cb_context);
736                         if (r <= 0)     /* handled */
737                                 break;
738                 }
739 
740                 *(u8 *)skb_push(skb, 1) = 0;    /* CTR, see spec:10.2.2.1 */
741 
742                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
743                 hdev->async_cb = cb;
744                 hdev->async_cb_context = cb_context;
745 
746                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
747                                            NFC_HCI_WR_XCHG_DATA, skb->data,
748                                            skb->len, hci_transceive_cb, hdev);
749                 break;
750         default:
751                 if (hdev->ops->im_transceive) {
752                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
753                                                      cb_context);
754                         if (r == 1)
755                                 r = -ENOTSUPP;
756                 } else {
757                         r = -ENOTSUPP;
758                 }
759                 break;
760         }
761 
762         kfree_skb(skb);
763 
764         return r;
765 }
766 
767 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
768 {
769         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
770 
771         if (!hdev->ops->tm_send) {
772                 kfree_skb(skb);
773                 return -ENOTSUPP;
774         }
775 
776         return hdev->ops->tm_send(hdev, skb);
777 }
778 
779 static int hci_check_presence(struct nfc_dev *nfc_dev,
780                               struct nfc_target *target)
781 {
782         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
783 
784         if (!hdev->ops->check_presence)
785                 return 0;
786 
787         return hdev->ops->check_presence(hdev, target);
788 }
789 
790 static int hci_discover_se(struct nfc_dev *nfc_dev)
791 {
792         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
793 
794         if (hdev->ops->discover_se)
795                 return hdev->ops->discover_se(hdev);
796 
797         return 0;
798 }
799 
800 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
801 {
802         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
803 
804         if (hdev->ops->enable_se)
805                 return hdev->ops->enable_se(hdev, se_idx);
806 
807         return 0;
808 }
809 
810 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
811 {
812         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
813 
814         if (hdev->ops->disable_se)
815                 return hdev->ops->disable_se(hdev, se_idx);
816 
817         return 0;
818 }
819 
820 static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
821                      u8 *apdu, size_t apdu_length,
822                      se_io_cb_t cb, void *cb_context)
823 {
824         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
825 
826         if (hdev->ops->se_io)
827                 return hdev->ops->se_io(hdev, se_idx, apdu,
828                                         apdu_length, cb, cb_context);
829 
830         return 0;
831 }
832 
833 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
834 {
835         mutex_lock(&hdev->msg_tx_mutex);
836 
837         if (hdev->cmd_pending_msg == NULL) {
838                 nfc_driver_failure(hdev->ndev, err);
839                 goto exit;
840         }
841 
842         __nfc_hci_cmd_completion(hdev, err, NULL);
843 
844 exit:
845         mutex_unlock(&hdev->msg_tx_mutex);
846 }
847 
848 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
849 {
850         nfc_hci_failure(hdev, err);
851 }
852 
853 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
854 {
855         struct hcp_packet *packet;
856         u8 type;
857         u8 instruction;
858         struct sk_buff *hcp_skb;
859         u8 pipe;
860         struct sk_buff *frag_skb;
861         int msg_len;
862 
863         packet = (struct hcp_packet *)skb->data;
864         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
865                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
866                 return;
867         }
868 
869         /* it's the last fragment. Does it need re-aggregation? */
870         if (skb_queue_len(&hdev->rx_hcp_frags)) {
871                 pipe = packet->header & NFC_HCI_FRAGMENT;
872                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
873 
874                 msg_len = 0;
875                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
876                         msg_len += (frag_skb->len -
877                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
878                 }
879 
880                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
881                                              msg_len, GFP_KERNEL);
882                 if (hcp_skb == NULL) {
883                         nfc_hci_failure(hdev, -ENOMEM);
884                         return;
885                 }
886 
887                 skb_put_u8(hcp_skb, pipe);
888 
889                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
890                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
891                         skb_put_data(hcp_skb,
892                                      frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
893                                      msg_len);
894                 }
895 
896                 skb_queue_purge(&hdev->rx_hcp_frags);
897         } else {
898                 packet->header &= NFC_HCI_FRAGMENT;
899                 hcp_skb = skb;
900         }
901 
902         /* if this is a response, dispatch immediately to
903          * unblock waiting cmd context. Otherwise, enqueue to dispatch
904          * in separate context where handler can also execute command.
905          */
906         packet = (struct hcp_packet *)hcp_skb->data;
907         type = HCP_MSG_GET_TYPE(packet->message.header);
908         if (type == NFC_HCI_HCP_RESPONSE) {
909                 pipe = packet->header;
910                 instruction = HCP_MSG_GET_CMD(packet->message.header);
911                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
912                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
913                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
914         } else {
915                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
916                 schedule_work(&hdev->msg_rx_work);
917         }
918 }
919 
920 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
921 {
922         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
923 
924         if (!hdev->ops->fw_download)
925                 return -ENOTSUPP;
926 
927         return hdev->ops->fw_download(hdev, firmware_name);
928 }
929 
930 static struct nfc_ops hci_nfc_ops = {
931         .dev_up = hci_dev_up,
932         .dev_down = hci_dev_down,
933         .start_poll = hci_start_poll,
934         .stop_poll = hci_stop_poll,
935         .dep_link_up = hci_dep_link_up,
936         .dep_link_down = hci_dep_link_down,
937         .activate_target = hci_activate_target,
938         .deactivate_target = hci_deactivate_target,
939         .im_transceive = hci_transceive,
940         .tm_send = hci_tm_send,
941         .check_presence = hci_check_presence,
942         .fw_download = hci_fw_download,
943         .discover_se = hci_discover_se,
944         .enable_se = hci_enable_se,
945         .disable_se = hci_disable_se,
946         .se_io = hci_se_io,
947 };
948 
949 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
950                                             struct nfc_hci_init_data *init_data,
951                                             unsigned long quirks,
952                                             u32 protocols,
953                                             const char *llc_name,
954                                             int tx_headroom,
955                                             int tx_tailroom,
956                                             int max_link_payload)
957 {
958         struct nfc_hci_dev *hdev;
959 
960         if (ops->xmit == NULL)
961                 return NULL;
962 
963         if (protocols == 0)
964                 return NULL;
965 
966         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
967         if (hdev == NULL)
968                 return NULL;
969 
970         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
971                                      nfc_hci_recv_from_llc, tx_headroom,
972                                      tx_tailroom, nfc_hci_llc_failure);
973         if (hdev->llc == NULL) {
974                 kfree(hdev);
975                 return NULL;
976         }
977 
978         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
979                                          tx_headroom + HCI_CMDS_HEADROOM,
980                                          tx_tailroom);
981         if (!hdev->ndev) {
982                 nfc_llc_free(hdev->llc);
983                 kfree(hdev);
984                 return NULL;
985         }
986 
987         hdev->ops = ops;
988         hdev->max_data_link_payload = max_link_payload;
989         hdev->init_data = *init_data;
990 
991         nfc_set_drvdata(hdev->ndev, hdev);
992 
993         nfc_hci_reset_pipes(hdev);
994 
995         hdev->quirks = quirks;
996 
997         return hdev;
998 }
999 EXPORT_SYMBOL(nfc_hci_allocate_device);
1000 
1001 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
1002 {
1003         nfc_free_device(hdev->ndev);
1004         nfc_llc_free(hdev->llc);
1005         kfree(hdev);
1006 }
1007 EXPORT_SYMBOL(nfc_hci_free_device);
1008 
1009 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
1010 {
1011         mutex_init(&hdev->msg_tx_mutex);
1012 
1013         INIT_LIST_HEAD(&hdev->msg_tx_queue);
1014 
1015         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1016 
1017         timer_setup(&hdev->cmd_timer, nfc_hci_cmd_timeout, 0);
1018 
1019         skb_queue_head_init(&hdev->rx_hcp_frags);
1020 
1021         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1022 
1023         skb_queue_head_init(&hdev->msg_rx_queue);
1024 
1025         return nfc_register_device(hdev->ndev);
1026 }
1027 EXPORT_SYMBOL(nfc_hci_register_device);
1028 
1029 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1030 {
1031         struct hci_msg *msg, *n;
1032 
1033         mutex_lock(&hdev->msg_tx_mutex);
1034 
1035         if (hdev->cmd_pending_msg) {
1036                 if (hdev->cmd_pending_msg->cb)
1037                         hdev->cmd_pending_msg->cb(
1038                                              hdev->cmd_pending_msg->cb_context,
1039                                              NULL, -ESHUTDOWN);
1040                 kfree(hdev->cmd_pending_msg);
1041                 hdev->cmd_pending_msg = NULL;
1042         }
1043 
1044         hdev->shutting_down = true;
1045 
1046         mutex_unlock(&hdev->msg_tx_mutex);
1047 
1048         del_timer_sync(&hdev->cmd_timer);
1049         cancel_work_sync(&hdev->msg_tx_work);
1050 
1051         cancel_work_sync(&hdev->msg_rx_work);
1052 
1053         nfc_unregister_device(hdev->ndev);
1054 
1055         skb_queue_purge(&hdev->rx_hcp_frags);
1056         skb_queue_purge(&hdev->msg_rx_queue);
1057 
1058         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1059                 list_del(&msg->msg_l);
1060                 skb_queue_purge(&msg->msg_frags);
1061                 kfree(msg);
1062         }
1063 }
1064 EXPORT_SYMBOL(nfc_hci_unregister_device);
1065 
1066 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1067 {
1068         hdev->clientdata = clientdata;
1069 }
1070 EXPORT_SYMBOL(nfc_hci_set_clientdata);
1071 
1072 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1073 {
1074         return hdev->clientdata;
1075 }
1076 EXPORT_SYMBOL(nfc_hci_get_clientdata);
1077 
1078 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1079 {
1080         nfc_hci_failure(hdev, err);
1081 }
1082 EXPORT_SYMBOL(nfc_hci_driver_failure);
1083 
1084 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1085 {
1086         nfc_llc_rcv_from_drv(hdev->llc, skb);
1087 }
1088 EXPORT_SYMBOL(nfc_hci_recv_frame);
1089 
1090 static int __init nfc_hci_init(void)
1091 {
1092         return nfc_llc_init();
1093 }
1094 
1095 static void __exit nfc_hci_exit(void)
1096 {
1097         nfc_llc_exit();
1098 }
1099 
1100 subsys_initcall(nfc_hci_init);
1101 module_exit(nfc_hci_exit);
1102 
1103 MODULE_LICENSE("GPL");
1104 MODULE_DESCRIPTION("NFC HCI Core");
1105 

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