~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.1-rc2 ] ~ [ linux-5.0.4 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.31 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.108 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.165 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.177 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.137 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.63 ] ~ [ 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-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp