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