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

Version: ~ [ linux-5.12-rc1 ] ~ [ linux-5.11.2 ] ~ [ linux-5.10.19 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.101 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.177 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.222 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.258 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.258 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ 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 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * Copyright (C) 2012  Intel Corporation. All rights reserved.
  4  */
  5 
  6 #define pr_fmt(fmt) "hci: %s: " fmt, __func__
  7 
  8 #include <linux/init.h>
  9 #include <linux/kernel.h>
 10 #include <linux/module.h>
 11 #include <linux/nfc.h>
 12 
 13 #include <net/nfc/nfc.h>
 14 #include <net/nfc/hci.h>
 15 #include <net/nfc/llc.h>
 16 
 17 #include "hci.h"
 18 
 19 /* Largest headroom needed for outgoing HCI commands */
 20 #define HCI_CMDS_HEADROOM 1
 21 
 22 int nfc_hci_result_to_errno(u8 result)
 23 {
 24         switch (result) {
 25         case NFC_HCI_ANY_OK:
 26                 return 0;
 27         case NFC_HCI_ANY_E_REG_PAR_UNKNOWN:
 28                 return -EOPNOTSUPP;
 29         case NFC_HCI_ANY_E_TIMEOUT:
 30                 return -ETIME;
 31         default:
 32                 return -1;
 33         }
 34 }
 35 EXPORT_SYMBOL(nfc_hci_result_to_errno);
 36 
 37 void nfc_hci_reset_pipes(struct nfc_hci_dev *hdev)
 38 {
 39         int i = 0;
 40 
 41         for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
 42                 hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
 43                 hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
 44         }
 45         memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
 46 }
 47 EXPORT_SYMBOL(nfc_hci_reset_pipes);
 48 
 49 void nfc_hci_reset_pipes_per_host(struct nfc_hci_dev *hdev, u8 host)
 50 {
 51         int i = 0;
 52 
 53         for (i = 0; i < NFC_HCI_MAX_PIPES; i++) {
 54                 if (hdev->pipes[i].dest_host != host)
 55                         continue;
 56 
 57                 hdev->pipes[i].gate = NFC_HCI_INVALID_GATE;
 58                 hdev->pipes[i].dest_host = NFC_HCI_INVALID_HOST;
 59         }
 60 }
 61 EXPORT_SYMBOL(nfc_hci_reset_pipes_per_host);
 62 
 63 static void nfc_hci_msg_tx_work(struct work_struct *work)
 64 {
 65         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
 66                                                 msg_tx_work);
 67         struct hci_msg *msg;
 68         struct sk_buff *skb;
 69         int r = 0;
 70 
 71         mutex_lock(&hdev->msg_tx_mutex);
 72         if (hdev->shutting_down)
 73                 goto exit;
 74 
 75         if (hdev->cmd_pending_msg) {
 76                 if (timer_pending(&hdev->cmd_timer) == 0) {
 77                         if (hdev->cmd_pending_msg->cb)
 78                                 hdev->cmd_pending_msg->cb(hdev->
 79                                                           cmd_pending_msg->
 80                                                           cb_context,
 81                                                           NULL,
 82                                                           -ETIME);
 83                         kfree(hdev->cmd_pending_msg);
 84                         hdev->cmd_pending_msg = NULL;
 85                 } else {
 86                         goto exit;
 87                 }
 88         }
 89 
 90 next_msg:
 91         if (list_empty(&hdev->msg_tx_queue))
 92                 goto exit;
 93 
 94         msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
 95         list_del(&msg->msg_l);
 96 
 97         pr_debug("msg_tx_queue has a cmd to send\n");
 98         while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
 99                 r = nfc_llc_xmit_from_hci(hdev->llc, skb);
100                 if (r < 0) {
101                         kfree_skb(skb);
102                         skb_queue_purge(&msg->msg_frags);
103                         if (msg->cb)
104                                 msg->cb(msg->cb_context, NULL, r);
105                         kfree(msg);
106                         break;
107                 }
108         }
109 
110         if (r)
111                 goto next_msg;
112 
113         if (msg->wait_response == false) {
114                 kfree(msg);
115                 goto next_msg;
116         }
117 
118         hdev->cmd_pending_msg = msg;
119         mod_timer(&hdev->cmd_timer, jiffies +
120                   msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
121 
122 exit:
123         mutex_unlock(&hdev->msg_tx_mutex);
124 }
125 
126 static void nfc_hci_msg_rx_work(struct work_struct *work)
127 {
128         struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
129                                                 msg_rx_work);
130         struct sk_buff *skb;
131         struct hcp_message *message;
132         u8 pipe;
133         u8 type;
134         u8 instruction;
135 
136         while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
137                 pipe = skb->data[0];
138                 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
139                 message = (struct hcp_message *)skb->data;
140                 type = HCP_MSG_GET_TYPE(message->header);
141                 instruction = HCP_MSG_GET_CMD(message->header);
142                 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
143 
144                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
145         }
146 }
147 
148 static void __nfc_hci_cmd_completion(struct nfc_hci_dev *hdev, int err,
149                                      struct sk_buff *skb)
150 {
151         del_timer_sync(&hdev->cmd_timer);
152 
153         if (hdev->cmd_pending_msg->cb)
154                 hdev->cmd_pending_msg->cb(hdev->cmd_pending_msg->cb_context,
155                                           skb, err);
156         else
157                 kfree_skb(skb);
158 
159         kfree(hdev->cmd_pending_msg);
160         hdev->cmd_pending_msg = NULL;
161 
162         schedule_work(&hdev->msg_tx_work);
163 }
164 
165 void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
166                            struct sk_buff *skb)
167 {
168         mutex_lock(&hdev->msg_tx_mutex);
169 
170         if (hdev->cmd_pending_msg == NULL) {
171                 kfree_skb(skb);
172                 goto exit;
173         }
174 
175         __nfc_hci_cmd_completion(hdev, nfc_hci_result_to_errno(result), skb);
176 
177 exit:
178         mutex_unlock(&hdev->msg_tx_mutex);
179 }
180 
181 void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
182                           struct sk_buff *skb)
183 {
184         u8 status = NFC_HCI_ANY_OK;
185         struct hci_create_pipe_resp *create_info;
186         struct hci_delete_pipe_noti *delete_info;
187         struct hci_all_pipe_cleared_noti *cleared_info;
188         u8 gate;
189 
190         pr_debug("from pipe %x cmd %x\n", pipe, cmd);
191 
192         if (pipe >= NFC_HCI_MAX_PIPES) {
193                 status = NFC_HCI_ANY_E_NOK;
194                 goto exit;
195         }
196 
197         gate = hdev->pipes[pipe].gate;
198 
199         switch (cmd) {
200         case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:
201                 if (skb->len != 5) {
202                         status = NFC_HCI_ANY_E_NOK;
203                         goto exit;
204                 }
205                 create_info = (struct hci_create_pipe_resp *)skb->data;
206 
207                 if (create_info->pipe >= NFC_HCI_MAX_PIPES) {
208                         status = NFC_HCI_ANY_E_NOK;
209                         goto exit;
210                 }
211 
212                 /* Save the new created pipe and bind with local gate,
213                  * the description for skb->data[3] is destination gate id
214                  * but since we received this cmd from host controller, we
215                  * are the destination and it is our local gate
216                  */
217                 hdev->gate2pipe[create_info->dest_gate] = create_info->pipe;
218                 hdev->pipes[create_info->pipe].gate = create_info->dest_gate;
219                 hdev->pipes[create_info->pipe].dest_host =
220                                                         create_info->src_host;
221                 break;
222         case NFC_HCI_ANY_OPEN_PIPE:
223                 if (gate == NFC_HCI_INVALID_GATE) {
224                         status = NFC_HCI_ANY_E_NOK;
225                         goto exit;
226                 }
227                 break;
228         case NFC_HCI_ADM_NOTIFY_PIPE_DELETED:
229                 if (skb->len != 1) {
230                         status = NFC_HCI_ANY_E_NOK;
231                         goto exit;
232                 }
233                 delete_info = (struct hci_delete_pipe_noti *)skb->data;
234 
235                 if (delete_info->pipe >= NFC_HCI_MAX_PIPES) {
236                         status = NFC_HCI_ANY_E_NOK;
237                         goto exit;
238                 }
239 
240                 hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
241                 hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
242                 break;
243         case NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED:
244                 if (skb->len != 1) {
245                         status = NFC_HCI_ANY_E_NOK;
246                         goto exit;
247                 }
248                 cleared_info = (struct hci_all_pipe_cleared_noti *)skb->data;
249 
250                 nfc_hci_reset_pipes_per_host(hdev, cleared_info->host);
251                 break;
252         default:
253                 pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);
254                 break;
255         }
256 
257         if (hdev->ops->cmd_received)
258                 hdev->ops->cmd_received(hdev, pipe, cmd, skb);
259 
260 exit:
261         nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
262                                status, NULL, 0, NULL, NULL, 0);
263 
264         kfree_skb(skb);
265 }
266 
267 u32 nfc_hci_sak_to_protocol(u8 sak)
268 {
269         switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
270         case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
271                 return NFC_PROTO_MIFARE_MASK;
272         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
273                 return NFC_PROTO_ISO14443_MASK;
274         case NFC_HCI_TYPE_A_SEL_PROT_DEP:
275                 return NFC_PROTO_NFC_DEP_MASK;
276         case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
277                 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
278         default:
279                 return 0xffffffff;
280         }
281 }
282 EXPORT_SYMBOL(nfc_hci_sak_to_protocol);
283 
284 int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
285 {
286         struct nfc_target *targets;
287         struct sk_buff *atqa_skb = NULL;
288         struct sk_buff *sak_skb = NULL;
289         struct sk_buff *uid_skb = NULL;
290         int r;
291 
292         pr_debug("from gate %d\n", gate);
293 
294         targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
295         if (targets == NULL)
296                 return -ENOMEM;
297 
298         switch (gate) {
299         case NFC_HCI_RF_READER_A_GATE:
300                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
301                                       NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
302                 if (r < 0)
303                         goto exit;
304 
305                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
306                                       NFC_HCI_RF_READER_A_SAK, &sak_skb);
307                 if (r < 0)
308                         goto exit;
309 
310                 if (atqa_skb->len != 2 || sak_skb->len != 1) {
311                         r = -EPROTO;
312                         goto exit;
313                 }
314 
315                 targets->supported_protocols =
316                                 nfc_hci_sak_to_protocol(sak_skb->data[0]);
317                 if (targets->supported_protocols == 0xffffffff) {
318                         r = -EPROTO;
319                         goto exit;
320                 }
321 
322                 targets->sens_res = be16_to_cpu(*(__be16 *)atqa_skb->data);
323                 targets->sel_res = sak_skb->data[0];
324 
325                 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
326                                       NFC_HCI_RF_READER_A_UID, &uid_skb);
327                 if (r < 0)
328                         goto exit;
329 
330                 if (uid_skb->len == 0 || uid_skb->len > NFC_NFCID1_MAXSIZE) {
331                         r = -EPROTO;
332                         goto exit;
333                 }
334 
335                 memcpy(targets->nfcid1, uid_skb->data, uid_skb->len);
336                 targets->nfcid1_len = uid_skb->len;
337 
338                 if (hdev->ops->complete_target_discovered) {
339                         r = hdev->ops->complete_target_discovered(hdev, gate,
340                                                                   targets);
341                         if (r < 0)
342                                 goto exit;
343                 }
344                 break;
345         case NFC_HCI_RF_READER_B_GATE:
346                 targets->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
347                 break;
348         default:
349                 if (hdev->ops->target_from_gate)
350                         r = hdev->ops->target_from_gate(hdev, gate, targets);
351                 else
352                         r = -EPROTO;
353                 if (r < 0)
354                         goto exit;
355 
356                 if (hdev->ops->complete_target_discovered) {
357                         r = hdev->ops->complete_target_discovered(hdev, gate,
358                                                                   targets);
359                         if (r < 0)
360                                 goto exit;
361                 }
362                 break;
363         }
364 
365         /* if driver set the new gate, we will skip the old one */
366         if (targets->hci_reader_gate == 0x00)
367                 targets->hci_reader_gate = gate;
368 
369         r = nfc_targets_found(hdev->ndev, targets, 1);
370 
371 exit:
372         kfree(targets);
373         kfree_skb(atqa_skb);
374         kfree_skb(sak_skb);
375         kfree_skb(uid_skb);
376 
377         return r;
378 }
379 EXPORT_SYMBOL(nfc_hci_target_discovered);
380 
381 void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
382                             struct sk_buff *skb)
383 {
384         int r = 0;
385         u8 gate;
386 
387         if (pipe >= NFC_HCI_MAX_PIPES) {
388                 pr_err("Discarded event %x to invalid pipe %x\n", event, pipe);
389                 goto exit;
390         }
391 
392         gate = hdev->pipes[pipe].gate;
393         if (gate == NFC_HCI_INVALID_GATE) {
394                 pr_err("Discarded event %x to unopened pipe %x\n", event, pipe);
395                 goto exit;
396         }
397 
398         if (hdev->ops->event_received) {
399                 r = hdev->ops->event_received(hdev, pipe, event, skb);
400                 if (r <= 0)
401                         goto exit_noskb;
402         }
403 
404         switch (event) {
405         case NFC_HCI_EVT_TARGET_DISCOVERED:
406                 if (skb->len < 1) {     /* no status data? */
407                         r = -EPROTO;
408                         goto exit;
409                 }
410 
411                 if (skb->data[0] == 3) {
412                         /* TODO: Multiple targets in field, none activated
413                          * poll is supposedly stopped, but there is no
414                          * single target to activate, so nothing to report
415                          * up.
416                          * if we need to restart poll, we must save the
417                          * protocols from the initial poll and reuse here.
418                          */
419                 }
420 
421                 if (skb->data[0] != 0) {
422                         r = -EPROTO;
423                         goto exit;
424                 }
425 
426                 r = nfc_hci_target_discovered(hdev, gate);
427                 break;
428         default:
429                 pr_info("Discarded unknown event %x to gate %x\n", event, gate);
430                 r = -EINVAL;
431                 break;
432         }
433 
434 exit:
435         kfree_skb(skb);
436 
437 exit_noskb:
438         if (r)
439                 nfc_hci_driver_failure(hdev, r);
440 }
441 
442 static void nfc_hci_cmd_timeout(struct timer_list *t)
443 {
444         struct nfc_hci_dev *hdev = from_timer(hdev, t, cmd_timer);
445 
446         schedule_work(&hdev->msg_tx_work);
447 }
448 
449 static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
450                                  struct nfc_hci_gate *gates)
451 {
452         int r;
453         while (gate_count--) {
454                 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
455                                          gates->gate, gates->pipe);
456                 if (r < 0)
457                         return r;
458                 gates++;
459         }
460 
461         return 0;
462 }
463 
464 static int hci_dev_session_init(struct nfc_hci_dev *hdev)
465 {
466         struct sk_buff *skb = NULL;
467         int r;
468 
469         if (hdev->init_data.gates[0].gate != NFC_HCI_ADMIN_GATE)
470                 return -EPROTO;
471 
472         r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
473                                  hdev->init_data.gates[0].gate,
474                                  hdev->init_data.gates[0].pipe);
475         if (r < 0)
476                 goto exit;
477 
478         r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
479                               NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
480         if (r < 0)
481                 goto disconnect_all;
482 
483         if (skb->len && skb->len == strlen(hdev->init_data.session_id) &&
484                 (memcmp(hdev->init_data.session_id, skb->data,
485                            skb->len) == 0) && hdev->ops->load_session) {
486                 /* Restore gate<->pipe table from some proprietary location. */
487 
488                 r = hdev->ops->load_session(hdev);
489 
490                 if (r < 0)
491                         goto disconnect_all;
492         } else {
493 
494                 r = nfc_hci_disconnect_all_gates(hdev);
495                 if (r < 0)
496                         goto exit;
497 
498                 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
499                                           hdev->init_data.gates);
500                 if (r < 0)
501                         goto disconnect_all;
502 
503                 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
504                                 NFC_HCI_ADMIN_SESSION_IDENTITY,
505                                 hdev->init_data.session_id,
506                                 strlen(hdev->init_data.session_id));
507         }
508         if (r == 0)
509                 goto exit;
510 
511 disconnect_all:
512         nfc_hci_disconnect_all_gates(hdev);
513 
514 exit:
515         kfree_skb(skb);
516 
517         return r;
518 }
519 
520 static int hci_dev_version(struct nfc_hci_dev *hdev)
521 {
522         int r;
523         struct sk_buff *skb;
524 
525         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
526                               NFC_HCI_ID_MGMT_VERSION_SW, &skb);
527         if (r == -EOPNOTSUPP) {
528                 pr_info("Software/Hardware info not available\n");
529                 return 0;
530         }
531         if (r < 0)
532                 return r;
533 
534         if (skb->len != 3) {
535                 kfree_skb(skb);
536                 return -EINVAL;
537         }
538 
539         hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
540         hdev->sw_patch = skb->data[0] & 0x0f;
541         hdev->sw_flashlib_major = skb->data[1];
542         hdev->sw_flashlib_minor = skb->data[2];
543 
544         kfree_skb(skb);
545 
546         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
547                               NFC_HCI_ID_MGMT_VERSION_HW, &skb);
548         if (r < 0)
549                 return r;
550 
551         if (skb->len != 3) {
552                 kfree_skb(skb);
553                 return -EINVAL;
554         }
555 
556         hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
557         hdev->hw_version = skb->data[0] & 0x1f;
558         hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
559         hdev->hw_software = skb->data[1] & 0x3f;
560         hdev->hw_bsid = skb->data[2];
561 
562         kfree_skb(skb);
563 
564         pr_info("SOFTWARE INFO:\n");
565         pr_info("RomLib         : %d\n", hdev->sw_romlib);
566         pr_info("Patch          : %d\n", hdev->sw_patch);
567         pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
568         pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
569         pr_info("HARDWARE INFO:\n");
570         pr_info("Derivative     : %d\n", hdev->hw_derivative);
571         pr_info("HW Version     : %d\n", hdev->hw_version);
572         pr_info("#MPW           : %d\n", hdev->hw_mpw);
573         pr_info("Software       : %d\n", hdev->hw_software);
574         pr_info("BSID Version   : %d\n", hdev->hw_bsid);
575 
576         return 0;
577 }
578 
579 static int hci_dev_up(struct nfc_dev *nfc_dev)
580 {
581         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
582         int r = 0;
583 
584         if (hdev->ops->open) {
585                 r = hdev->ops->open(hdev);
586                 if (r < 0)
587                         return r;
588         }
589 
590         r = nfc_llc_start(hdev->llc);
591         if (r < 0)
592                 goto exit_close;
593 
594         r = hci_dev_session_init(hdev);
595         if (r < 0)
596                 goto exit_llc;
597 
598         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
599                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
600         if (r < 0)
601                 goto exit_llc;
602 
603         if (hdev->ops->hci_ready) {
604                 r = hdev->ops->hci_ready(hdev);
605                 if (r < 0)
606                         goto exit_llc;
607         }
608 
609         r = hci_dev_version(hdev);
610         if (r < 0)
611                 goto exit_llc;
612 
613         return 0;
614 
615 exit_llc:
616         nfc_llc_stop(hdev->llc);
617 
618 exit_close:
619         if (hdev->ops->close)
620                 hdev->ops->close(hdev);
621 
622         return r;
623 }
624 
625 static int hci_dev_down(struct nfc_dev *nfc_dev)
626 {
627         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
628 
629         nfc_llc_stop(hdev->llc);
630 
631         if (hdev->ops->close)
632                 hdev->ops->close(hdev);
633 
634         nfc_hci_reset_pipes(hdev);
635 
636         return 0;
637 }
638 
639 static int hci_start_poll(struct nfc_dev *nfc_dev,
640                           u32 im_protocols, u32 tm_protocols)
641 {
642         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
643 
644         if (hdev->ops->start_poll)
645                 return hdev->ops->start_poll(hdev, im_protocols, tm_protocols);
646         else
647                 return nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
648                                           NFC_HCI_EVT_READER_REQUESTED,
649                                           NULL, 0);
650 }
651 
652 static void hci_stop_poll(struct nfc_dev *nfc_dev)
653 {
654         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
655 
656         if (hdev->ops->stop_poll)
657                 hdev->ops->stop_poll(hdev);
658         else
659                 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
660                                    NFC_HCI_EVT_END_OPERATION, NULL, 0);
661 }
662 
663 static int hci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
664                                 __u8 comm_mode, __u8 *gb, size_t gb_len)
665 {
666         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
667 
668         if (!hdev->ops->dep_link_up)
669                 return 0;
670 
671         return hdev->ops->dep_link_up(hdev, target, comm_mode,
672                                       gb, gb_len);
673 }
674 
675 static int hci_dep_link_down(struct nfc_dev *nfc_dev)
676 {
677         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
678 
679         if (!hdev->ops->dep_link_down)
680                 return 0;
681 
682         return hdev->ops->dep_link_down(hdev);
683 }
684 
685 static int hci_activate_target(struct nfc_dev *nfc_dev,
686                                struct nfc_target *target, u32 protocol)
687 {
688         return 0;
689 }
690 
691 static void hci_deactivate_target(struct nfc_dev *nfc_dev,
692                                   struct nfc_target *target,
693                                   u8 mode)
694 {
695 }
696 
697 #define HCI_CB_TYPE_TRANSCEIVE 1
698 
699 static void hci_transceive_cb(void *context, struct sk_buff *skb, int err)
700 {
701         struct nfc_hci_dev *hdev = context;
702 
703         switch (hdev->async_cb_type) {
704         case HCI_CB_TYPE_TRANSCEIVE:
705                 /*
706                  * TODO: Check RF Error indicator to make sure data is valid.
707                  * It seems that HCI cmd can complete without error, but data
708                  * can be invalid if an RF error occured? Ignore for now.
709                  */
710                 if (err == 0)
711                         skb_trim(skb, skb->len - 1); /* RF Err ind */
712 
713                 hdev->async_cb(hdev->async_cb_context, skb, err);
714                 break;
715         default:
716                 if (err == 0)
717                         kfree_skb(skb);
718                 break;
719         }
720 }
721 
722 static int hci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
723                           struct sk_buff *skb, data_exchange_cb_t cb,
724                           void *cb_context)
725 {
726         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
727         int r;
728 
729         pr_debug("target_idx=%d\n", target->idx);
730 
731         switch (target->hci_reader_gate) {
732         case NFC_HCI_RF_READER_A_GATE:
733         case NFC_HCI_RF_READER_B_GATE:
734                 if (hdev->ops->im_transceive) {
735                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
736                                                      cb_context);
737                         if (r <= 0)     /* handled */
738                                 break;
739                 }
740 
741                 *(u8 *)skb_push(skb, 1) = 0;    /* CTR, see spec:10.2.2.1 */
742 
743                 hdev->async_cb_type = HCI_CB_TYPE_TRANSCEIVE;
744                 hdev->async_cb = cb;
745                 hdev->async_cb_context = cb_context;
746 
747                 r = nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
748                                            NFC_HCI_WR_XCHG_DATA, skb->data,
749                                            skb->len, hci_transceive_cb, hdev);
750                 break;
751         default:
752                 if (hdev->ops->im_transceive) {
753                         r = hdev->ops->im_transceive(hdev, target, skb, cb,
754                                                      cb_context);
755                         if (r == 1)
756                                 r = -ENOTSUPP;
757                 } else {
758                         r = -ENOTSUPP;
759                 }
760                 break;
761         }
762 
763         kfree_skb(skb);
764 
765         return r;
766 }
767 
768 static int hci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
769 {
770         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
771 
772         if (!hdev->ops->tm_send) {
773                 kfree_skb(skb);
774                 return -ENOTSUPP;
775         }
776 
777         return hdev->ops->tm_send(hdev, skb);
778 }
779 
780 static int hci_check_presence(struct nfc_dev *nfc_dev,
781                               struct nfc_target *target)
782 {
783         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
784 
785         if (!hdev->ops->check_presence)
786                 return 0;
787 
788         return hdev->ops->check_presence(hdev, target);
789 }
790 
791 static int hci_discover_se(struct nfc_dev *nfc_dev)
792 {
793         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
794 
795         if (hdev->ops->discover_se)
796                 return hdev->ops->discover_se(hdev);
797 
798         return 0;
799 }
800 
801 static int hci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
802 {
803         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
804 
805         if (hdev->ops->enable_se)
806                 return hdev->ops->enable_se(hdev, se_idx);
807 
808         return 0;
809 }
810 
811 static int hci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
812 {
813         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
814 
815         if (hdev->ops->disable_se)
816                 return hdev->ops->disable_se(hdev, se_idx);
817 
818         return 0;
819 }
820 
821 static int hci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
822                      u8 *apdu, size_t apdu_length,
823                      se_io_cb_t cb, void *cb_context)
824 {
825         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
826 
827         if (hdev->ops->se_io)
828                 return hdev->ops->se_io(hdev, se_idx, apdu,
829                                         apdu_length, cb, cb_context);
830 
831         return 0;
832 }
833 
834 static void nfc_hci_failure(struct nfc_hci_dev *hdev, int err)
835 {
836         mutex_lock(&hdev->msg_tx_mutex);
837 
838         if (hdev->cmd_pending_msg == NULL) {
839                 nfc_driver_failure(hdev->ndev, err);
840                 goto exit;
841         }
842 
843         __nfc_hci_cmd_completion(hdev, err, NULL);
844 
845 exit:
846         mutex_unlock(&hdev->msg_tx_mutex);
847 }
848 
849 static void nfc_hci_llc_failure(struct nfc_hci_dev *hdev, int err)
850 {
851         nfc_hci_failure(hdev, err);
852 }
853 
854 static void nfc_hci_recv_from_llc(struct nfc_hci_dev *hdev, struct sk_buff *skb)
855 {
856         struct hcp_packet *packet;
857         u8 type;
858         u8 instruction;
859         struct sk_buff *hcp_skb;
860         u8 pipe;
861         struct sk_buff *frag_skb;
862         int msg_len;
863 
864         packet = (struct hcp_packet *)skb->data;
865         if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
866                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
867                 return;
868         }
869 
870         /* it's the last fragment. Does it need re-aggregation? */
871         if (skb_queue_len(&hdev->rx_hcp_frags)) {
872                 pipe = packet->header & NFC_HCI_FRAGMENT;
873                 skb_queue_tail(&hdev->rx_hcp_frags, skb);
874 
875                 msg_len = 0;
876                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
877                         msg_len += (frag_skb->len -
878                                     NFC_HCI_HCP_PACKET_HEADER_LEN);
879                 }
880 
881                 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
882                                              msg_len, GFP_KERNEL);
883                 if (hcp_skb == NULL) {
884                         nfc_hci_failure(hdev, -ENOMEM);
885                         return;
886                 }
887 
888                 skb_put_u8(hcp_skb, pipe);
889 
890                 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
891                         msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
892                         skb_put_data(hcp_skb,
893                                      frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
894                                      msg_len);
895                 }
896 
897                 skb_queue_purge(&hdev->rx_hcp_frags);
898         } else {
899                 packet->header &= NFC_HCI_FRAGMENT;
900                 hcp_skb = skb;
901         }
902 
903         /* if this is a response, dispatch immediately to
904          * unblock waiting cmd context. Otherwise, enqueue to dispatch
905          * in separate context where handler can also execute command.
906          */
907         packet = (struct hcp_packet *)hcp_skb->data;
908         type = HCP_MSG_GET_TYPE(packet->message.header);
909         if (type == NFC_HCI_HCP_RESPONSE) {
910                 pipe = packet->header;
911                 instruction = HCP_MSG_GET_CMD(packet->message.header);
912                 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
913                          NFC_HCI_HCP_MESSAGE_HEADER_LEN);
914                 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
915         } else {
916                 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
917                 schedule_work(&hdev->msg_rx_work);
918         }
919 }
920 
921 static int hci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
922 {
923         struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
924 
925         if (!hdev->ops->fw_download)
926                 return -ENOTSUPP;
927 
928         return hdev->ops->fw_download(hdev, firmware_name);
929 }
930 
931 static struct nfc_ops hci_nfc_ops = {
932         .dev_up = hci_dev_up,
933         .dev_down = hci_dev_down,
934         .start_poll = hci_start_poll,
935         .stop_poll = hci_stop_poll,
936         .dep_link_up = hci_dep_link_up,
937         .dep_link_down = hci_dep_link_down,
938         .activate_target = hci_activate_target,
939         .deactivate_target = hci_deactivate_target,
940         .im_transceive = hci_transceive,
941         .tm_send = hci_tm_send,
942         .check_presence = hci_check_presence,
943         .fw_download = hci_fw_download,
944         .discover_se = hci_discover_se,
945         .enable_se = hci_enable_se,
946         .disable_se = hci_disable_se,
947         .se_io = hci_se_io,
948 };
949 
950 struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
951                                             struct nfc_hci_init_data *init_data,
952                                             unsigned long quirks,
953                                             u32 protocols,
954                                             const char *llc_name,
955                                             int tx_headroom,
956                                             int tx_tailroom,
957                                             int max_link_payload)
958 {
959         struct nfc_hci_dev *hdev;
960 
961         if (ops->xmit == NULL)
962                 return NULL;
963 
964         if (protocols == 0)
965                 return NULL;
966 
967         hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
968         if (hdev == NULL)
969                 return NULL;
970 
971         hdev->llc = nfc_llc_allocate(llc_name, hdev, ops->xmit,
972                                      nfc_hci_recv_from_llc, tx_headroom,
973                                      tx_tailroom, nfc_hci_llc_failure);
974         if (hdev->llc == NULL) {
975                 kfree(hdev);
976                 return NULL;
977         }
978 
979         hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
980                                          tx_headroom + HCI_CMDS_HEADROOM,
981                                          tx_tailroom);
982         if (!hdev->ndev) {
983                 nfc_llc_free(hdev->llc);
984                 kfree(hdev);
985                 return NULL;
986         }
987 
988         hdev->ops = ops;
989         hdev->max_data_link_payload = max_link_payload;
990         hdev->init_data = *init_data;
991 
992         nfc_set_drvdata(hdev->ndev, hdev);
993 
994         nfc_hci_reset_pipes(hdev);
995 
996         hdev->quirks = quirks;
997 
998         return hdev;
999 }
1000 EXPORT_SYMBOL(nfc_hci_allocate_device);
1001 
1002 void nfc_hci_free_device(struct nfc_hci_dev *hdev)
1003 {
1004         nfc_free_device(hdev->ndev);
1005         nfc_llc_free(hdev->llc);
1006         kfree(hdev);
1007 }
1008 EXPORT_SYMBOL(nfc_hci_free_device);
1009 
1010 int nfc_hci_register_device(struct nfc_hci_dev *hdev)
1011 {
1012         mutex_init(&hdev->msg_tx_mutex);
1013 
1014         INIT_LIST_HEAD(&hdev->msg_tx_queue);
1015 
1016         INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
1017 
1018         timer_setup(&hdev->cmd_timer, nfc_hci_cmd_timeout, 0);
1019 
1020         skb_queue_head_init(&hdev->rx_hcp_frags);
1021 
1022         INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
1023 
1024         skb_queue_head_init(&hdev->msg_rx_queue);
1025 
1026         return nfc_register_device(hdev->ndev);
1027 }
1028 EXPORT_SYMBOL(nfc_hci_register_device);
1029 
1030 void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
1031 {
1032         struct hci_msg *msg, *n;
1033 
1034         mutex_lock(&hdev->msg_tx_mutex);
1035 
1036         if (hdev->cmd_pending_msg) {
1037                 if (hdev->cmd_pending_msg->cb)
1038                         hdev->cmd_pending_msg->cb(
1039                                              hdev->cmd_pending_msg->cb_context,
1040                                              NULL, -ESHUTDOWN);
1041                 kfree(hdev->cmd_pending_msg);
1042                 hdev->cmd_pending_msg = NULL;
1043         }
1044 
1045         hdev->shutting_down = true;
1046 
1047         mutex_unlock(&hdev->msg_tx_mutex);
1048 
1049         del_timer_sync(&hdev->cmd_timer);
1050         cancel_work_sync(&hdev->msg_tx_work);
1051 
1052         cancel_work_sync(&hdev->msg_rx_work);
1053 
1054         nfc_unregister_device(hdev->ndev);
1055 
1056         skb_queue_purge(&hdev->rx_hcp_frags);
1057         skb_queue_purge(&hdev->msg_rx_queue);
1058 
1059         list_for_each_entry_safe(msg, n, &hdev->msg_tx_queue, msg_l) {
1060                 list_del(&msg->msg_l);
1061                 skb_queue_purge(&msg->msg_frags);
1062                 kfree(msg);
1063         }
1064 }
1065 EXPORT_SYMBOL(nfc_hci_unregister_device);
1066 
1067 void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
1068 {
1069         hdev->clientdata = clientdata;
1070 }
1071 EXPORT_SYMBOL(nfc_hci_set_clientdata);
1072 
1073 void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
1074 {
1075         return hdev->clientdata;
1076 }
1077 EXPORT_SYMBOL(nfc_hci_get_clientdata);
1078 
1079 void nfc_hci_driver_failure(struct nfc_hci_dev *hdev, int err)
1080 {
1081         nfc_hci_failure(hdev, err);
1082 }
1083 EXPORT_SYMBOL(nfc_hci_driver_failure);
1084 
1085 void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
1086 {
1087         nfc_llc_rcv_from_drv(hdev->llc, skb);
1088 }
1089 EXPORT_SYMBOL(nfc_hci_recv_frame);
1090 
1091 static int __init nfc_hci_init(void)
1092 {
1093         return nfc_llc_init();
1094 }
1095 
1096 static void __exit nfc_hci_exit(void)
1097 {
1098         nfc_llc_exit();
1099 }
1100 
1101 subsys_initcall(nfc_hci_init);
1102 module_exit(nfc_hci_exit);
1103 
1104 MODULE_LICENSE("GPL");
1105 MODULE_DESCRIPTION("NFC HCI Core");
1106 

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