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Linux/net/nfc/nci/core.c

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  1 /*
  2  *  The NFC Controller Interface is the communication protocol between an
  3  *  NFC Controller (NFCC) and a Device Host (DH).
  4  *
  5  *  Copyright (C) 2011 Texas Instruments, Inc.
  6  *
  7  *  Written by Ilan Elias <ilane@ti.com>
  8  *
  9  *  Acknowledgements:
 10  *  This file is based on hci_core.c, which was written
 11  *  by Maxim Krasnyansky.
 12  *
 13  *  This program is free software; you can redistribute it and/or modify
 14  *  it under the terms of the GNU General Public License version 2
 15  *  as published by the Free Software Foundation
 16  *
 17  *  This program is distributed in the hope that it will be useful,
 18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 20  *  GNU General Public License for more details.
 21  *
 22  *  You should have received a copy of the GNU General Public License
 23  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
 24  *
 25  */
 26 
 27 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
 28 
 29 #include <linux/module.h>
 30 #include <linux/types.h>
 31 #include <linux/workqueue.h>
 32 #include <linux/completion.h>
 33 #include <linux/export.h>
 34 #include <linux/sched.h>
 35 #include <linux/bitops.h>
 36 #include <linux/skbuff.h>
 37 
 38 #include "../nfc.h"
 39 #include <net/nfc/nci.h>
 40 #include <net/nfc/nci_core.h>
 41 #include <linux/nfc.h>
 42 
 43 static void nci_cmd_work(struct work_struct *work);
 44 static void nci_rx_work(struct work_struct *work);
 45 static void nci_tx_work(struct work_struct *work);
 46 
 47 /* ---- NCI requests ---- */
 48 
 49 void nci_req_complete(struct nci_dev *ndev, int result)
 50 {
 51         if (ndev->req_status == NCI_REQ_PEND) {
 52                 ndev->req_result = result;
 53                 ndev->req_status = NCI_REQ_DONE;
 54                 complete(&ndev->req_completion);
 55         }
 56 }
 57 
 58 static void nci_req_cancel(struct nci_dev *ndev, int err)
 59 {
 60         if (ndev->req_status == NCI_REQ_PEND) {
 61                 ndev->req_result = err;
 62                 ndev->req_status = NCI_REQ_CANCELED;
 63                 complete(&ndev->req_completion);
 64         }
 65 }
 66 
 67 /* Execute request and wait for completion. */
 68 static int __nci_request(struct nci_dev *ndev,
 69                          void (*req)(struct nci_dev *ndev, unsigned long opt),
 70                          unsigned long opt, __u32 timeout)
 71 {
 72         int rc = 0;
 73         long completion_rc;
 74 
 75         ndev->req_status = NCI_REQ_PEND;
 76 
 77         init_completion(&ndev->req_completion);
 78         req(ndev, opt);
 79         completion_rc =
 80                 wait_for_completion_interruptible_timeout(&ndev->req_completion,
 81                                                           timeout);
 82 
 83         pr_debug("wait_for_completion return %ld\n", completion_rc);
 84 
 85         if (completion_rc > 0) {
 86                 switch (ndev->req_status) {
 87                 case NCI_REQ_DONE:
 88                         rc = nci_to_errno(ndev->req_result);
 89                         break;
 90 
 91                 case NCI_REQ_CANCELED:
 92                         rc = -ndev->req_result;
 93                         break;
 94 
 95                 default:
 96                         rc = -ETIMEDOUT;
 97                         break;
 98                 }
 99         } else {
100                 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
101                        completion_rc);
102 
103                 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
104         }
105 
106         ndev->req_status = ndev->req_result = 0;
107 
108         return rc;
109 }
110 
111 static inline int nci_request(struct nci_dev *ndev,
112                               void (*req)(struct nci_dev *ndev,
113                                           unsigned long opt),
114                               unsigned long opt, __u32 timeout)
115 {
116         int rc;
117 
118         if (!test_bit(NCI_UP, &ndev->flags))
119                 return -ENETDOWN;
120 
121         /* Serialize all requests */
122         mutex_lock(&ndev->req_lock);
123         rc = __nci_request(ndev, req, opt, timeout);
124         mutex_unlock(&ndev->req_lock);
125 
126         return rc;
127 }
128 
129 static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
130 {
131         struct nci_core_reset_cmd cmd;
132 
133         cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
134         nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
135 }
136 
137 static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
138 {
139         nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
140 }
141 
142 static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
143 {
144         struct nci_rf_disc_map_cmd cmd;
145         struct disc_map_config *cfg = cmd.mapping_configs;
146         __u8 *num = &cmd.num_mapping_configs;
147         int i;
148 
149         /* set rf mapping configurations */
150         *num = 0;
151 
152         /* by default mapping is set to NCI_RF_INTERFACE_FRAME */
153         for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
154                 if (ndev->supported_rf_interfaces[i] ==
155                     NCI_RF_INTERFACE_ISO_DEP) {
156                         cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
157                         cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
158                                 NCI_DISC_MAP_MODE_LISTEN;
159                         cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
160                         (*num)++;
161                 } else if (ndev->supported_rf_interfaces[i] ==
162                            NCI_RF_INTERFACE_NFC_DEP) {
163                         cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
164                         cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
165                                 NCI_DISC_MAP_MODE_LISTEN;
166                         cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
167                         (*num)++;
168                 }
169 
170                 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
171                         break;
172         }
173 
174         nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
175                      (1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
176 }
177 
178 struct nci_set_config_param {
179         __u8    id;
180         size_t  len;
181         __u8    *val;
182 };
183 
184 static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt)
185 {
186         struct nci_set_config_param *param = (struct nci_set_config_param *)opt;
187         struct nci_core_set_config_cmd cmd;
188 
189         BUG_ON(param->len > NCI_MAX_PARAM_LEN);
190 
191         cmd.num_params = 1;
192         cmd.param.id = param->id;
193         cmd.param.len = param->len;
194         memcpy(cmd.param.val, param->val, param->len);
195 
196         nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd);
197 }
198 
199 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
200 {
201         struct nci_rf_disc_cmd cmd;
202         __u32 protocols = opt;
203 
204         cmd.num_disc_configs = 0;
205 
206         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
207             (protocols & NFC_PROTO_JEWEL_MASK ||
208              protocols & NFC_PROTO_MIFARE_MASK ||
209              protocols & NFC_PROTO_ISO14443_MASK ||
210              protocols & NFC_PROTO_NFC_DEP_MASK)) {
211                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
212                         NCI_NFC_A_PASSIVE_POLL_MODE;
213                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
214                 cmd.num_disc_configs++;
215         }
216 
217         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
218             (protocols & NFC_PROTO_ISO14443_B_MASK)) {
219                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
220                         NCI_NFC_B_PASSIVE_POLL_MODE;
221                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
222                 cmd.num_disc_configs++;
223         }
224 
225         if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
226             (protocols & NFC_PROTO_FELICA_MASK ||
227              protocols & NFC_PROTO_NFC_DEP_MASK)) {
228                 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
229                         NCI_NFC_F_PASSIVE_POLL_MODE;
230                 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
231                 cmd.num_disc_configs++;
232         }
233 
234         nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
235                      (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
236                      &cmd);
237 }
238 
239 struct nci_rf_discover_select_param {
240         __u8    rf_discovery_id;
241         __u8    rf_protocol;
242 };
243 
244 static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
245 {
246         struct nci_rf_discover_select_param *param =
247                 (struct nci_rf_discover_select_param *)opt;
248         struct nci_rf_discover_select_cmd cmd;
249 
250         cmd.rf_discovery_id = param->rf_discovery_id;
251         cmd.rf_protocol = param->rf_protocol;
252 
253         switch (cmd.rf_protocol) {
254         case NCI_RF_PROTOCOL_ISO_DEP:
255                 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
256                 break;
257 
258         case NCI_RF_PROTOCOL_NFC_DEP:
259                 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
260                 break;
261 
262         default:
263                 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
264                 break;
265         }
266 
267         nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
268                      sizeof(struct nci_rf_discover_select_cmd), &cmd);
269 }
270 
271 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
272 {
273         struct nci_rf_deactivate_cmd cmd;
274 
275         cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE;
276 
277         nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
278                      sizeof(struct nci_rf_deactivate_cmd), &cmd);
279 }
280 
281 static int nci_open_device(struct nci_dev *ndev)
282 {
283         int rc = 0;
284 
285         mutex_lock(&ndev->req_lock);
286 
287         if (test_bit(NCI_UP, &ndev->flags)) {
288                 rc = -EALREADY;
289                 goto done;
290         }
291 
292         if (ndev->ops->open(ndev)) {
293                 rc = -EIO;
294                 goto done;
295         }
296 
297         atomic_set(&ndev->cmd_cnt, 1);
298 
299         set_bit(NCI_INIT, &ndev->flags);
300 
301         rc = __nci_request(ndev, nci_reset_req, 0,
302                            msecs_to_jiffies(NCI_RESET_TIMEOUT));
303 
304         if (ndev->ops->setup)
305                 ndev->ops->setup(ndev);
306 
307         if (!rc) {
308                 rc = __nci_request(ndev, nci_init_req, 0,
309                                    msecs_to_jiffies(NCI_INIT_TIMEOUT));
310         }
311 
312         if (!rc) {
313                 rc = __nci_request(ndev, nci_init_complete_req, 0,
314                                    msecs_to_jiffies(NCI_INIT_TIMEOUT));
315         }
316 
317         clear_bit(NCI_INIT, &ndev->flags);
318 
319         if (!rc) {
320                 set_bit(NCI_UP, &ndev->flags);
321                 nci_clear_target_list(ndev);
322                 atomic_set(&ndev->state, NCI_IDLE);
323         } else {
324                 /* Init failed, cleanup */
325                 skb_queue_purge(&ndev->cmd_q);
326                 skb_queue_purge(&ndev->rx_q);
327                 skb_queue_purge(&ndev->tx_q);
328 
329                 ndev->ops->close(ndev);
330                 ndev->flags = 0;
331         }
332 
333 done:
334         mutex_unlock(&ndev->req_lock);
335         return rc;
336 }
337 
338 static int nci_close_device(struct nci_dev *ndev)
339 {
340         nci_req_cancel(ndev, ENODEV);
341         mutex_lock(&ndev->req_lock);
342 
343         if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
344                 del_timer_sync(&ndev->cmd_timer);
345                 del_timer_sync(&ndev->data_timer);
346                 mutex_unlock(&ndev->req_lock);
347                 return 0;
348         }
349 
350         /* Drop RX and TX queues */
351         skb_queue_purge(&ndev->rx_q);
352         skb_queue_purge(&ndev->tx_q);
353 
354         /* Flush RX and TX wq */
355         flush_workqueue(ndev->rx_wq);
356         flush_workqueue(ndev->tx_wq);
357 
358         /* Reset device */
359         skb_queue_purge(&ndev->cmd_q);
360         atomic_set(&ndev->cmd_cnt, 1);
361 
362         set_bit(NCI_INIT, &ndev->flags);
363         __nci_request(ndev, nci_reset_req, 0,
364                       msecs_to_jiffies(NCI_RESET_TIMEOUT));
365         clear_bit(NCI_INIT, &ndev->flags);
366 
367         del_timer_sync(&ndev->cmd_timer);
368 
369         /* Flush cmd wq */
370         flush_workqueue(ndev->cmd_wq);
371 
372         /* After this point our queues are empty
373          * and no works are scheduled. */
374         ndev->ops->close(ndev);
375 
376         /* Clear flags */
377         ndev->flags = 0;
378 
379         mutex_unlock(&ndev->req_lock);
380 
381         return 0;
382 }
383 
384 /* NCI command timer function */
385 static void nci_cmd_timer(unsigned long arg)
386 {
387         struct nci_dev *ndev = (void *) arg;
388 
389         atomic_set(&ndev->cmd_cnt, 1);
390         queue_work(ndev->cmd_wq, &ndev->cmd_work);
391 }
392 
393 /* NCI data exchange timer function */
394 static void nci_data_timer(unsigned long arg)
395 {
396         struct nci_dev *ndev = (void *) arg;
397 
398         set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
399         queue_work(ndev->rx_wq, &ndev->rx_work);
400 }
401 
402 static int nci_dev_up(struct nfc_dev *nfc_dev)
403 {
404         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
405 
406         return nci_open_device(ndev);
407 }
408 
409 static int nci_dev_down(struct nfc_dev *nfc_dev)
410 {
411         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
412 
413         return nci_close_device(ndev);
414 }
415 
416 int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val)
417 {
418         struct nci_set_config_param param;
419 
420         if (!val || !len)
421                 return 0;
422 
423         param.id = id;
424         param.len = len;
425         param.val = val;
426 
427         return __nci_request(ndev, nci_set_config_req, (unsigned long)&param,
428                              msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
429 }
430 EXPORT_SYMBOL(nci_set_config);
431 
432 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
433 {
434         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
435         struct nci_set_config_param param;
436 
437         param.val = nfc_get_local_general_bytes(nfc_dev, &param.len);
438         if ((param.val == NULL) || (param.len == 0))
439                 return 0;
440 
441         if (param.len > NFC_MAX_GT_LEN)
442                 return -EINVAL;
443 
444         param.id = NCI_PN_ATR_REQ_GEN_BYTES;
445 
446         return nci_request(ndev, nci_set_config_req, (unsigned long)&param,
447                            msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
448 }
449 
450 static int nci_start_poll(struct nfc_dev *nfc_dev,
451                           __u32 im_protocols, __u32 tm_protocols)
452 {
453         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
454         int rc;
455 
456         if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
457             (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
458                 pr_err("unable to start poll, since poll is already active\n");
459                 return -EBUSY;
460         }
461 
462         if (ndev->target_active_prot) {
463                 pr_err("there is an active target\n");
464                 return -EBUSY;
465         }
466 
467         if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
468             (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
469                 pr_debug("target active or w4 select, implicitly deactivate\n");
470 
471                 rc = nci_request(ndev, nci_rf_deactivate_req, 0,
472                                  msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
473                 if (rc)
474                         return -EBUSY;
475         }
476 
477         if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
478                 rc = nci_set_local_general_bytes(nfc_dev);
479                 if (rc) {
480                         pr_err("failed to set local general bytes\n");
481                         return rc;
482                 }
483         }
484 
485         rc = nci_request(ndev, nci_rf_discover_req, im_protocols,
486                          msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
487 
488         if (!rc)
489                 ndev->poll_prots = im_protocols;
490 
491         return rc;
492 }
493 
494 static void nci_stop_poll(struct nfc_dev *nfc_dev)
495 {
496         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
497 
498         if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
499             (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
500                 pr_err("unable to stop poll, since poll is not active\n");
501                 return;
502         }
503 
504         nci_request(ndev, nci_rf_deactivate_req, 0,
505                     msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
506 }
507 
508 static int nci_activate_target(struct nfc_dev *nfc_dev,
509                                struct nfc_target *target, __u32 protocol)
510 {
511         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
512         struct nci_rf_discover_select_param param;
513         struct nfc_target *nci_target = NULL;
514         int i;
515         int rc = 0;
516 
517         pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
518 
519         if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
520             (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
521                 pr_err("there is no available target to activate\n");
522                 return -EINVAL;
523         }
524 
525         if (ndev->target_active_prot) {
526                 pr_err("there is already an active target\n");
527                 return -EBUSY;
528         }
529 
530         for (i = 0; i < ndev->n_targets; i++) {
531                 if (ndev->targets[i].idx == target->idx) {
532                         nci_target = &ndev->targets[i];
533                         break;
534                 }
535         }
536 
537         if (!nci_target) {
538                 pr_err("unable to find the selected target\n");
539                 return -EINVAL;
540         }
541 
542         if (!(nci_target->supported_protocols & (1 << protocol))) {
543                 pr_err("target does not support the requested protocol 0x%x\n",
544                        protocol);
545                 return -EINVAL;
546         }
547 
548         if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
549                 param.rf_discovery_id = nci_target->logical_idx;
550 
551                 if (protocol == NFC_PROTO_JEWEL)
552                         param.rf_protocol = NCI_RF_PROTOCOL_T1T;
553                 else if (protocol == NFC_PROTO_MIFARE)
554                         param.rf_protocol = NCI_RF_PROTOCOL_T2T;
555                 else if (protocol == NFC_PROTO_FELICA)
556                         param.rf_protocol = NCI_RF_PROTOCOL_T3T;
557                 else if (protocol == NFC_PROTO_ISO14443 ||
558                          protocol == NFC_PROTO_ISO14443_B)
559                         param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
560                 else
561                         param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
562 
563                 rc = nci_request(ndev, nci_rf_discover_select_req,
564                                  (unsigned long)&param,
565                                  msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
566         }
567 
568         if (!rc)
569                 ndev->target_active_prot = protocol;
570 
571         return rc;
572 }
573 
574 static void nci_deactivate_target(struct nfc_dev *nfc_dev,
575                                   struct nfc_target *target)
576 {
577         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
578 
579         pr_debug("entry\n");
580 
581         if (!ndev->target_active_prot) {
582                 pr_err("unable to deactivate target, no active target\n");
583                 return;
584         }
585 
586         ndev->target_active_prot = 0;
587 
588         if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
589                 nci_request(ndev, nci_rf_deactivate_req, 0,
590                             msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
591         }
592 }
593 
594 static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
595                            __u8 comm_mode, __u8 *gb, size_t gb_len)
596 {
597         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
598         int rc;
599 
600         pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
601 
602         rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
603         if (rc)
604                 return rc;
605 
606         rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
607                                           ndev->remote_gb_len);
608         if (!rc)
609                 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
610                                         NFC_RF_INITIATOR);
611 
612         return rc;
613 }
614 
615 static int nci_dep_link_down(struct nfc_dev *nfc_dev)
616 {
617         pr_debug("entry\n");
618 
619         nci_deactivate_target(nfc_dev, NULL);
620 
621         return 0;
622 }
623 
624 
625 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
626                           struct sk_buff *skb,
627                           data_exchange_cb_t cb, void *cb_context)
628 {
629         struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
630         int rc;
631 
632         pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
633 
634         if (!ndev->target_active_prot) {
635                 pr_err("unable to exchange data, no active target\n");
636                 return -EINVAL;
637         }
638 
639         if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
640                 return -EBUSY;
641 
642         /* store cb and context to be used on receiving data */
643         ndev->data_exchange_cb = cb;
644         ndev->data_exchange_cb_context = cb_context;
645 
646         rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
647         if (rc)
648                 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
649 
650         return rc;
651 }
652 
653 static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
654 {
655         return 0;
656 }
657 
658 static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
659 {
660         return 0;
661 }
662 
663 static int nci_discover_se(struct nfc_dev *nfc_dev)
664 {
665         return 0;
666 }
667 
668 static struct nfc_ops nci_nfc_ops = {
669         .dev_up = nci_dev_up,
670         .dev_down = nci_dev_down,
671         .start_poll = nci_start_poll,
672         .stop_poll = nci_stop_poll,
673         .dep_link_up = nci_dep_link_up,
674         .dep_link_down = nci_dep_link_down,
675         .activate_target = nci_activate_target,
676         .deactivate_target = nci_deactivate_target,
677         .im_transceive = nci_transceive,
678         .enable_se = nci_enable_se,
679         .disable_se = nci_disable_se,
680         .discover_se = nci_discover_se,
681 };
682 
683 /* ---- Interface to NCI drivers ---- */
684 
685 /**
686  * nci_allocate_device - allocate a new nci device
687  *
688  * @ops: device operations
689  * @supported_protocols: NFC protocols supported by the device
690  */
691 struct nci_dev *nci_allocate_device(struct nci_ops *ops,
692                                     __u32 supported_protocols,
693                                     int tx_headroom, int tx_tailroom)
694 {
695         struct nci_dev *ndev;
696 
697         pr_debug("supported_protocols 0x%x\n", supported_protocols);
698 
699         if (!ops->open || !ops->close || !ops->send)
700                 return NULL;
701 
702         if (!supported_protocols)
703                 return NULL;
704 
705         ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
706         if (!ndev)
707                 return NULL;
708 
709         ndev->ops = ops;
710         ndev->tx_headroom = tx_headroom;
711         ndev->tx_tailroom = tx_tailroom;
712 
713         ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
714                                             supported_protocols,
715                                             tx_headroom + NCI_DATA_HDR_SIZE,
716                                             tx_tailroom);
717         if (!ndev->nfc_dev)
718                 goto free_exit;
719 
720         nfc_set_drvdata(ndev->nfc_dev, ndev);
721 
722         return ndev;
723 
724 free_exit:
725         kfree(ndev);
726         return NULL;
727 }
728 EXPORT_SYMBOL(nci_allocate_device);
729 
730 /**
731  * nci_free_device - deallocate nci device
732  *
733  * @ndev: The nci device to deallocate
734  */
735 void nci_free_device(struct nci_dev *ndev)
736 {
737         nfc_free_device(ndev->nfc_dev);
738         kfree(ndev);
739 }
740 EXPORT_SYMBOL(nci_free_device);
741 
742 /**
743  * nci_register_device - register a nci device in the nfc subsystem
744  *
745  * @dev: The nci device to register
746  */
747 int nci_register_device(struct nci_dev *ndev)
748 {
749         int rc;
750         struct device *dev = &ndev->nfc_dev->dev;
751         char name[32];
752 
753         rc = nfc_register_device(ndev->nfc_dev);
754         if (rc)
755                 goto exit;
756 
757         ndev->flags = 0;
758 
759         INIT_WORK(&ndev->cmd_work, nci_cmd_work);
760         snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
761         ndev->cmd_wq = create_singlethread_workqueue(name);
762         if (!ndev->cmd_wq) {
763                 rc = -ENOMEM;
764                 goto unreg_exit;
765         }
766 
767         INIT_WORK(&ndev->rx_work, nci_rx_work);
768         snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
769         ndev->rx_wq = create_singlethread_workqueue(name);
770         if (!ndev->rx_wq) {
771                 rc = -ENOMEM;
772                 goto destroy_cmd_wq_exit;
773         }
774 
775         INIT_WORK(&ndev->tx_work, nci_tx_work);
776         snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
777         ndev->tx_wq = create_singlethread_workqueue(name);
778         if (!ndev->tx_wq) {
779                 rc = -ENOMEM;
780                 goto destroy_rx_wq_exit;
781         }
782 
783         skb_queue_head_init(&ndev->cmd_q);
784         skb_queue_head_init(&ndev->rx_q);
785         skb_queue_head_init(&ndev->tx_q);
786 
787         setup_timer(&ndev->cmd_timer, nci_cmd_timer,
788                     (unsigned long) ndev);
789         setup_timer(&ndev->data_timer, nci_data_timer,
790                     (unsigned long) ndev);
791 
792         mutex_init(&ndev->req_lock);
793 
794         goto exit;
795 
796 destroy_rx_wq_exit:
797         destroy_workqueue(ndev->rx_wq);
798 
799 destroy_cmd_wq_exit:
800         destroy_workqueue(ndev->cmd_wq);
801 
802 unreg_exit:
803         nfc_unregister_device(ndev->nfc_dev);
804 
805 exit:
806         return rc;
807 }
808 EXPORT_SYMBOL(nci_register_device);
809 
810 /**
811  * nci_unregister_device - unregister a nci device in the nfc subsystem
812  *
813  * @dev: The nci device to unregister
814  */
815 void nci_unregister_device(struct nci_dev *ndev)
816 {
817         nci_close_device(ndev);
818 
819         destroy_workqueue(ndev->cmd_wq);
820         destroy_workqueue(ndev->rx_wq);
821         destroy_workqueue(ndev->tx_wq);
822 
823         nfc_unregister_device(ndev->nfc_dev);
824 }
825 EXPORT_SYMBOL(nci_unregister_device);
826 
827 /**
828  * nci_recv_frame - receive frame from NCI drivers
829  *
830  * @ndev: The nci device
831  * @skb: The sk_buff to receive
832  */
833 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
834 {
835         pr_debug("len %d\n", skb->len);
836 
837         if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
838             !test_bit(NCI_INIT, &ndev->flags))) {
839                 kfree_skb(skb);
840                 return -ENXIO;
841         }
842 
843         /* Queue frame for rx worker thread */
844         skb_queue_tail(&ndev->rx_q, skb);
845         queue_work(ndev->rx_wq, &ndev->rx_work);
846 
847         return 0;
848 }
849 EXPORT_SYMBOL(nci_recv_frame);
850 
851 static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
852 {
853         pr_debug("len %d\n", skb->len);
854 
855         if (!ndev) {
856                 kfree_skb(skb);
857                 return -ENODEV;
858         }
859 
860         /* Get rid of skb owner, prior to sending to the driver. */
861         skb_orphan(skb);
862 
863         return ndev->ops->send(ndev, skb);
864 }
865 
866 /* Send NCI command */
867 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
868 {
869         struct nci_ctrl_hdr *hdr;
870         struct sk_buff *skb;
871 
872         pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
873 
874         skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
875         if (!skb) {
876                 pr_err("no memory for command\n");
877                 return -ENOMEM;
878         }
879 
880         hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
881         hdr->gid = nci_opcode_gid(opcode);
882         hdr->oid = nci_opcode_oid(opcode);
883         hdr->plen = plen;
884 
885         nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
886         nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
887 
888         if (plen)
889                 memcpy(skb_put(skb, plen), payload, plen);
890 
891         skb_queue_tail(&ndev->cmd_q, skb);
892         queue_work(ndev->cmd_wq, &ndev->cmd_work);
893 
894         return 0;
895 }
896 
897 /* ---- NCI TX Data worker thread ---- */
898 
899 static void nci_tx_work(struct work_struct *work)
900 {
901         struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
902         struct sk_buff *skb;
903 
904         pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt));
905 
906         /* Send queued tx data */
907         while (atomic_read(&ndev->credits_cnt)) {
908                 skb = skb_dequeue(&ndev->tx_q);
909                 if (!skb)
910                         return;
911 
912                 /* Check if data flow control is used */
913                 if (atomic_read(&ndev->credits_cnt) !=
914                     NCI_DATA_FLOW_CONTROL_NOT_USED)
915                         atomic_dec(&ndev->credits_cnt);
916 
917                 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
918                          nci_pbf(skb->data),
919                          nci_conn_id(skb->data),
920                          nci_plen(skb->data));
921 
922                 nci_send_frame(ndev, skb);
923 
924                 mod_timer(&ndev->data_timer,
925                           jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
926         }
927 }
928 
929 /* ----- NCI RX worker thread (data & control) ----- */
930 
931 static void nci_rx_work(struct work_struct *work)
932 {
933         struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
934         struct sk_buff *skb;
935 
936         while ((skb = skb_dequeue(&ndev->rx_q))) {
937                 /* Process frame */
938                 switch (nci_mt(skb->data)) {
939                 case NCI_MT_RSP_PKT:
940                         nci_rsp_packet(ndev, skb);
941                         break;
942 
943                 case NCI_MT_NTF_PKT:
944                         nci_ntf_packet(ndev, skb);
945                         break;
946 
947                 case NCI_MT_DATA_PKT:
948                         nci_rx_data_packet(ndev, skb);
949                         break;
950 
951                 default:
952                         pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
953                         kfree_skb(skb);
954                         break;
955                 }
956         }
957 
958         /* check if a data exchange timout has occurred */
959         if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
960                 /* complete the data exchange transaction, if exists */
961                 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
962                         nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT);
963 
964                 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
965         }
966 }
967 
968 /* ----- NCI TX CMD worker thread ----- */
969 
970 static void nci_cmd_work(struct work_struct *work)
971 {
972         struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
973         struct sk_buff *skb;
974 
975         pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
976 
977         /* Send queued command */
978         if (atomic_read(&ndev->cmd_cnt)) {
979                 skb = skb_dequeue(&ndev->cmd_q);
980                 if (!skb)
981                         return;
982 
983                 atomic_dec(&ndev->cmd_cnt);
984 
985                 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
986                          nci_pbf(skb->data),
987                          nci_opcode_gid(nci_opcode(skb->data)),
988                          nci_opcode_oid(nci_opcode(skb->data)),
989                          nci_plen(skb->data));
990 
991                 nci_send_frame(ndev, skb);
992 
993                 mod_timer(&ndev->cmd_timer,
994                           jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
995         }
996 }
997 
998 MODULE_LICENSE("GPL");
999 

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