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[mirror_ubuntu-jammy-kernel.git] / net / nfc / nci / core.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * The NFC Controller Interface is the communication protocol between an
4 * NFC Controller (NFCC) and a Device Host (DH).
5 *
6 * Copyright (C) 2011 Texas Instruments, Inc.
7 * Copyright (C) 2014 Marvell International Ltd.
8 *
9 * Written by Ilan Elias <ilane@ti.com>
10 *
11 * Acknowledgements:
12 * This file is based on hci_core.c, which was written
13 * by Maxim Krasnyansky.
14 */
15
16 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
17
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/types.h>
21 #include <linux/workqueue.h>
22 #include <linux/completion.h>
23 #include <linux/export.h>
24 #include <linux/sched.h>
25 #include <linux/bitops.h>
26 #include <linux/skbuff.h>
27
28 #include "../nfc.h"
29 #include <net/nfc/nci.h>
30 #include <net/nfc/nci_core.h>
31 #include <linux/nfc.h>
32
33 struct core_conn_create_data {
34 int length;
35 struct nci_core_conn_create_cmd *cmd;
36 };
37
38 static void nci_cmd_work(struct work_struct *work);
39 static void nci_rx_work(struct work_struct *work);
40 static void nci_tx_work(struct work_struct *work);
41
42 struct nci_conn_info *nci_get_conn_info_by_conn_id(struct nci_dev *ndev,
43 int conn_id)
44 {
45 struct nci_conn_info *conn_info;
46
47 list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
48 if (conn_info->conn_id == conn_id)
49 return conn_info;
50 }
51
52 return NULL;
53 }
54
55 int nci_get_conn_info_by_dest_type_params(struct nci_dev *ndev, u8 dest_type,
56 const struct dest_spec_params *params)
57 {
58 const struct nci_conn_info *conn_info;
59
60 list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
61 if (conn_info->dest_type == dest_type) {
62 if (!params)
63 return conn_info->conn_id;
64
65 if (params->id == conn_info->dest_params->id &&
66 params->protocol == conn_info->dest_params->protocol)
67 return conn_info->conn_id;
68 }
69 }
70
71 return -EINVAL;
72 }
73 EXPORT_SYMBOL(nci_get_conn_info_by_dest_type_params);
74
75 /* ---- NCI requests ---- */
76
77 void nci_req_complete(struct nci_dev *ndev, int result)
78 {
79 if (ndev->req_status == NCI_REQ_PEND) {
80 ndev->req_result = result;
81 ndev->req_status = NCI_REQ_DONE;
82 complete(&ndev->req_completion);
83 }
84 }
85 EXPORT_SYMBOL(nci_req_complete);
86
87 static void nci_req_cancel(struct nci_dev *ndev, int err)
88 {
89 if (ndev->req_status == NCI_REQ_PEND) {
90 ndev->req_result = err;
91 ndev->req_status = NCI_REQ_CANCELED;
92 complete(&ndev->req_completion);
93 }
94 }
95
96 /* Execute request and wait for completion. */
97 static int __nci_request(struct nci_dev *ndev,
98 void (*req)(struct nci_dev *ndev, const void *opt),
99 const void *opt, __u32 timeout)
100 {
101 int rc = 0;
102 long completion_rc;
103
104 ndev->req_status = NCI_REQ_PEND;
105
106 reinit_completion(&ndev->req_completion);
107 req(ndev, opt);
108 completion_rc =
109 wait_for_completion_interruptible_timeout(&ndev->req_completion,
110 timeout);
111
112 pr_debug("wait_for_completion return %ld\n", completion_rc);
113
114 if (completion_rc > 0) {
115 switch (ndev->req_status) {
116 case NCI_REQ_DONE:
117 rc = nci_to_errno(ndev->req_result);
118 break;
119
120 case NCI_REQ_CANCELED:
121 rc = -ndev->req_result;
122 break;
123
124 default:
125 rc = -ETIMEDOUT;
126 break;
127 }
128 } else {
129 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
130 completion_rc);
131
132 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
133 }
134
135 ndev->req_status = ndev->req_result = 0;
136
137 return rc;
138 }
139
140 inline int nci_request(struct nci_dev *ndev,
141 void (*req)(struct nci_dev *ndev,
142 const void *opt),
143 const void *opt, __u32 timeout)
144 {
145 int rc;
146
147 /* Serialize all requests */
148 mutex_lock(&ndev->req_lock);
149 /* check the state after obtaing the lock against any races
150 * from nci_close_device when the device gets removed.
151 */
152 if (test_bit(NCI_UP, &ndev->flags))
153 rc = __nci_request(ndev, req, opt, timeout);
154 else
155 rc = -ENETDOWN;
156 mutex_unlock(&ndev->req_lock);
157
158 return rc;
159 }
160
161 static void nci_reset_req(struct nci_dev *ndev, const void *opt)
162 {
163 struct nci_core_reset_cmd cmd;
164
165 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
166 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
167 }
168
169 static void nci_init_req(struct nci_dev *ndev, const void *opt)
170 {
171 u8 plen = 0;
172
173 if (opt)
174 plen = sizeof(struct nci_core_init_v2_cmd);
175
176 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, plen, opt);
177 }
178
179 static void nci_init_complete_req(struct nci_dev *ndev, const void *opt)
180 {
181 struct nci_rf_disc_map_cmd cmd;
182 struct disc_map_config *cfg = cmd.mapping_configs;
183 __u8 *num = &cmd.num_mapping_configs;
184 int i;
185
186 /* set rf mapping configurations */
187 *num = 0;
188
189 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */
190 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
191 if (ndev->supported_rf_interfaces[i] ==
192 NCI_RF_INTERFACE_ISO_DEP) {
193 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
194 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
195 NCI_DISC_MAP_MODE_LISTEN;
196 cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
197 (*num)++;
198 } else if (ndev->supported_rf_interfaces[i] ==
199 NCI_RF_INTERFACE_NFC_DEP) {
200 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
201 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
202 NCI_DISC_MAP_MODE_LISTEN;
203 cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
204 (*num)++;
205 }
206
207 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
208 break;
209 }
210
211 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
212 (1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
213 }
214
215 struct nci_set_config_param {
216 __u8 id;
217 size_t len;
218 const __u8 *val;
219 };
220
221 static void nci_set_config_req(struct nci_dev *ndev, const void *opt)
222 {
223 const struct nci_set_config_param *param = opt;
224 struct nci_core_set_config_cmd cmd;
225
226 BUG_ON(param->len > NCI_MAX_PARAM_LEN);
227
228 cmd.num_params = 1;
229 cmd.param.id = param->id;
230 cmd.param.len = param->len;
231 memcpy(cmd.param.val, param->val, param->len);
232
233 nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd);
234 }
235
236 struct nci_rf_discover_param {
237 __u32 im_protocols;
238 __u32 tm_protocols;
239 };
240
241 static void nci_rf_discover_req(struct nci_dev *ndev, const void *opt)
242 {
243 const struct nci_rf_discover_param *param = opt;
244 struct nci_rf_disc_cmd cmd;
245
246 cmd.num_disc_configs = 0;
247
248 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
249 (param->im_protocols & NFC_PROTO_JEWEL_MASK ||
250 param->im_protocols & NFC_PROTO_MIFARE_MASK ||
251 param->im_protocols & NFC_PROTO_ISO14443_MASK ||
252 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
253 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
254 NCI_NFC_A_PASSIVE_POLL_MODE;
255 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
256 cmd.num_disc_configs++;
257 }
258
259 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
260 (param->im_protocols & NFC_PROTO_ISO14443_B_MASK)) {
261 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
262 NCI_NFC_B_PASSIVE_POLL_MODE;
263 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
264 cmd.num_disc_configs++;
265 }
266
267 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
268 (param->im_protocols & NFC_PROTO_FELICA_MASK ||
269 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
270 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
271 NCI_NFC_F_PASSIVE_POLL_MODE;
272 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
273 cmd.num_disc_configs++;
274 }
275
276 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
277 (param->im_protocols & NFC_PROTO_ISO15693_MASK)) {
278 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
279 NCI_NFC_V_PASSIVE_POLL_MODE;
280 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
281 cmd.num_disc_configs++;
282 }
283
284 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS - 1) &&
285 (param->tm_protocols & NFC_PROTO_NFC_DEP_MASK)) {
286 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
287 NCI_NFC_A_PASSIVE_LISTEN_MODE;
288 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
289 cmd.num_disc_configs++;
290 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
291 NCI_NFC_F_PASSIVE_LISTEN_MODE;
292 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
293 cmd.num_disc_configs++;
294 }
295
296 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
297 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
298 &cmd);
299 }
300
301 struct nci_rf_discover_select_param {
302 __u8 rf_discovery_id;
303 __u8 rf_protocol;
304 };
305
306 static void nci_rf_discover_select_req(struct nci_dev *ndev, const void *opt)
307 {
308 const struct nci_rf_discover_select_param *param = opt;
309 struct nci_rf_discover_select_cmd cmd;
310
311 cmd.rf_discovery_id = param->rf_discovery_id;
312 cmd.rf_protocol = param->rf_protocol;
313
314 switch (cmd.rf_protocol) {
315 case NCI_RF_PROTOCOL_ISO_DEP:
316 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
317 break;
318
319 case NCI_RF_PROTOCOL_NFC_DEP:
320 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
321 break;
322
323 default:
324 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
325 break;
326 }
327
328 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
329 sizeof(struct nci_rf_discover_select_cmd), &cmd);
330 }
331
332 static void nci_rf_deactivate_req(struct nci_dev *ndev, const void *opt)
333 {
334 struct nci_rf_deactivate_cmd cmd;
335
336 cmd.type = (unsigned long)opt;
337
338 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
339 sizeof(struct nci_rf_deactivate_cmd), &cmd);
340 }
341
342 struct nci_cmd_param {
343 __u16 opcode;
344 size_t len;
345 const __u8 *payload;
346 };
347
348 static void nci_generic_req(struct nci_dev *ndev, const void *opt)
349 {
350 const struct nci_cmd_param *param = opt;
351
352 nci_send_cmd(ndev, param->opcode, param->len, param->payload);
353 }
354
355 int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, const __u8 *payload)
356 {
357 struct nci_cmd_param param;
358
359 param.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY, oid);
360 param.len = len;
361 param.payload = payload;
362
363 return __nci_request(ndev, nci_generic_req, &param,
364 msecs_to_jiffies(NCI_CMD_TIMEOUT));
365 }
366 EXPORT_SYMBOL(nci_prop_cmd);
367
368 int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len,
369 const __u8 *payload)
370 {
371 struct nci_cmd_param param;
372
373 param.opcode = opcode;
374 param.len = len;
375 param.payload = payload;
376
377 return __nci_request(ndev, nci_generic_req, &param,
378 msecs_to_jiffies(NCI_CMD_TIMEOUT));
379 }
380 EXPORT_SYMBOL(nci_core_cmd);
381
382 int nci_core_reset(struct nci_dev *ndev)
383 {
384 return __nci_request(ndev, nci_reset_req, (void *)0,
385 msecs_to_jiffies(NCI_RESET_TIMEOUT));
386 }
387 EXPORT_SYMBOL(nci_core_reset);
388
389 int nci_core_init(struct nci_dev *ndev)
390 {
391 return __nci_request(ndev, nci_init_req, (void *)0,
392 msecs_to_jiffies(NCI_INIT_TIMEOUT));
393 }
394 EXPORT_SYMBOL(nci_core_init);
395
396 struct nci_loopback_data {
397 u8 conn_id;
398 struct sk_buff *data;
399 };
400
401 static void nci_send_data_req(struct nci_dev *ndev, const void *opt)
402 {
403 const struct nci_loopback_data *data = opt;
404
405 nci_send_data(ndev, data->conn_id, data->data);
406 }
407
408 static void nci_nfcc_loopback_cb(void *context, struct sk_buff *skb, int err)
409 {
410 struct nci_dev *ndev = (struct nci_dev *)context;
411 struct nci_conn_info *conn_info;
412
413 conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
414 if (!conn_info) {
415 nci_req_complete(ndev, NCI_STATUS_REJECTED);
416 return;
417 }
418
419 conn_info->rx_skb = skb;
420
421 nci_req_complete(ndev, NCI_STATUS_OK);
422 }
423
424 int nci_nfcc_loopback(struct nci_dev *ndev, const void *data, size_t data_len,
425 struct sk_buff **resp)
426 {
427 int r;
428 struct nci_loopback_data loopback_data;
429 struct nci_conn_info *conn_info;
430 struct sk_buff *skb;
431 int conn_id = nci_get_conn_info_by_dest_type_params(ndev,
432 NCI_DESTINATION_NFCC_LOOPBACK, NULL);
433
434 if (conn_id < 0) {
435 r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCC_LOOPBACK,
436 0, 0, NULL);
437 if (r != NCI_STATUS_OK)
438 return r;
439
440 conn_id = nci_get_conn_info_by_dest_type_params(ndev,
441 NCI_DESTINATION_NFCC_LOOPBACK,
442 NULL);
443 }
444
445 conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
446 if (!conn_info)
447 return -EPROTO;
448
449 /* store cb and context to be used on receiving data */
450 conn_info->data_exchange_cb = nci_nfcc_loopback_cb;
451 conn_info->data_exchange_cb_context = ndev;
452
453 skb = nci_skb_alloc(ndev, NCI_DATA_HDR_SIZE + data_len, GFP_KERNEL);
454 if (!skb)
455 return -ENOMEM;
456
457 skb_reserve(skb, NCI_DATA_HDR_SIZE);
458 skb_put_data(skb, data, data_len);
459
460 loopback_data.conn_id = conn_id;
461 loopback_data.data = skb;
462
463 ndev->cur_conn_id = conn_id;
464 r = nci_request(ndev, nci_send_data_req, &loopback_data,
465 msecs_to_jiffies(NCI_DATA_TIMEOUT));
466 if (r == NCI_STATUS_OK && resp)
467 *resp = conn_info->rx_skb;
468
469 return r;
470 }
471 EXPORT_SYMBOL(nci_nfcc_loopback);
472
473 static int nci_open_device(struct nci_dev *ndev)
474 {
475 int rc = 0;
476
477 mutex_lock(&ndev->req_lock);
478
479 if (test_bit(NCI_UNREG, &ndev->flags)) {
480 rc = -ENODEV;
481 goto done;
482 }
483
484 if (test_bit(NCI_UP, &ndev->flags)) {
485 rc = -EALREADY;
486 goto done;
487 }
488
489 if (ndev->ops->open(ndev)) {
490 rc = -EIO;
491 goto done;
492 }
493
494 atomic_set(&ndev->cmd_cnt, 1);
495
496 set_bit(NCI_INIT, &ndev->flags);
497
498 if (ndev->ops->init)
499 rc = ndev->ops->init(ndev);
500
501 if (!rc) {
502 rc = __nci_request(ndev, nci_reset_req, (void *)0,
503 msecs_to_jiffies(NCI_RESET_TIMEOUT));
504 }
505
506 if (!rc && ndev->ops->setup) {
507 rc = ndev->ops->setup(ndev);
508 }
509
510 if (!rc) {
511 struct nci_core_init_v2_cmd nci_init_v2_cmd = {
512 .feature1 = NCI_FEATURE_DISABLE,
513 .feature2 = NCI_FEATURE_DISABLE
514 };
515 const void *opt = NULL;
516
517 if (ndev->nci_ver & NCI_VER_2_MASK)
518 opt = &nci_init_v2_cmd;
519
520 rc = __nci_request(ndev, nci_init_req, opt,
521 msecs_to_jiffies(NCI_INIT_TIMEOUT));
522 }
523
524 if (!rc && ndev->ops->post_setup)
525 rc = ndev->ops->post_setup(ndev);
526
527 if (!rc) {
528 rc = __nci_request(ndev, nci_init_complete_req, (void *)0,
529 msecs_to_jiffies(NCI_INIT_TIMEOUT));
530 }
531
532 clear_bit(NCI_INIT, &ndev->flags);
533
534 if (!rc) {
535 set_bit(NCI_UP, &ndev->flags);
536 nci_clear_target_list(ndev);
537 atomic_set(&ndev->state, NCI_IDLE);
538 } else {
539 /* Init failed, cleanup */
540 skb_queue_purge(&ndev->cmd_q);
541 skb_queue_purge(&ndev->rx_q);
542 skb_queue_purge(&ndev->tx_q);
543
544 ndev->ops->close(ndev);
545 ndev->flags = 0;
546 }
547
548 done:
549 mutex_unlock(&ndev->req_lock);
550 return rc;
551 }
552
553 static int nci_close_device(struct nci_dev *ndev)
554 {
555 nci_req_cancel(ndev, ENODEV);
556
557 /* This mutex needs to be held as a barrier for
558 * caller nci_unregister_device
559 */
560 mutex_lock(&ndev->req_lock);
561
562 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
563 del_timer_sync(&ndev->cmd_timer);
564 del_timer_sync(&ndev->data_timer);
565 mutex_unlock(&ndev->req_lock);
566 return 0;
567 }
568
569 /* Drop RX and TX queues */
570 skb_queue_purge(&ndev->rx_q);
571 skb_queue_purge(&ndev->tx_q);
572
573 /* Flush RX and TX wq */
574 flush_workqueue(ndev->rx_wq);
575 flush_workqueue(ndev->tx_wq);
576
577 /* Reset device */
578 skb_queue_purge(&ndev->cmd_q);
579 atomic_set(&ndev->cmd_cnt, 1);
580
581 set_bit(NCI_INIT, &ndev->flags);
582 __nci_request(ndev, nci_reset_req, (void *)0,
583 msecs_to_jiffies(NCI_RESET_TIMEOUT));
584
585 /* After this point our queues are empty
586 * and no works are scheduled.
587 */
588 ndev->ops->close(ndev);
589
590 clear_bit(NCI_INIT, &ndev->flags);
591
592 /* Flush cmd wq */
593 flush_workqueue(ndev->cmd_wq);
594
595 del_timer_sync(&ndev->cmd_timer);
596
597 /* Clear flags except NCI_UNREG */
598 ndev->flags &= BIT(NCI_UNREG);
599
600 mutex_unlock(&ndev->req_lock);
601
602 return 0;
603 }
604
605 /* NCI command timer function */
606 static void nci_cmd_timer(struct timer_list *t)
607 {
608 struct nci_dev *ndev = from_timer(ndev, t, cmd_timer);
609
610 atomic_set(&ndev->cmd_cnt, 1);
611 queue_work(ndev->cmd_wq, &ndev->cmd_work);
612 }
613
614 /* NCI data exchange timer function */
615 static void nci_data_timer(struct timer_list *t)
616 {
617 struct nci_dev *ndev = from_timer(ndev, t, data_timer);
618
619 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
620 queue_work(ndev->rx_wq, &ndev->rx_work);
621 }
622
623 static int nci_dev_up(struct nfc_dev *nfc_dev)
624 {
625 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
626
627 return nci_open_device(ndev);
628 }
629
630 static int nci_dev_down(struct nfc_dev *nfc_dev)
631 {
632 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
633
634 return nci_close_device(ndev);
635 }
636
637 int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, const __u8 *val)
638 {
639 struct nci_set_config_param param;
640
641 if (!val || !len)
642 return 0;
643
644 param.id = id;
645 param.len = len;
646 param.val = val;
647
648 return __nci_request(ndev, nci_set_config_req, &param,
649 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
650 }
651 EXPORT_SYMBOL(nci_set_config);
652
653 static void nci_nfcee_discover_req(struct nci_dev *ndev, const void *opt)
654 {
655 struct nci_nfcee_discover_cmd cmd;
656 __u8 action = (unsigned long)opt;
657
658 cmd.discovery_action = action;
659
660 nci_send_cmd(ndev, NCI_OP_NFCEE_DISCOVER_CMD, 1, &cmd);
661 }
662
663 int nci_nfcee_discover(struct nci_dev *ndev, u8 action)
664 {
665 unsigned long opt = action;
666
667 return __nci_request(ndev, nci_nfcee_discover_req, (void *)opt,
668 msecs_to_jiffies(NCI_CMD_TIMEOUT));
669 }
670 EXPORT_SYMBOL(nci_nfcee_discover);
671
672 static void nci_nfcee_mode_set_req(struct nci_dev *ndev, const void *opt)
673 {
674 const struct nci_nfcee_mode_set_cmd *cmd = opt;
675
676 nci_send_cmd(ndev, NCI_OP_NFCEE_MODE_SET_CMD,
677 sizeof(struct nci_nfcee_mode_set_cmd), cmd);
678 }
679
680 int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode)
681 {
682 struct nci_nfcee_mode_set_cmd cmd;
683
684 cmd.nfcee_id = nfcee_id;
685 cmd.nfcee_mode = nfcee_mode;
686
687 return __nci_request(ndev, nci_nfcee_mode_set_req, &cmd,
688 msecs_to_jiffies(NCI_CMD_TIMEOUT));
689 }
690 EXPORT_SYMBOL(nci_nfcee_mode_set);
691
692 static void nci_core_conn_create_req(struct nci_dev *ndev, const void *opt)
693 {
694 const struct core_conn_create_data *data = opt;
695
696 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, data->length, data->cmd);
697 }
698
699 int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type,
700 u8 number_destination_params,
701 size_t params_len,
702 const struct core_conn_create_dest_spec_params *params)
703 {
704 int r;
705 struct nci_core_conn_create_cmd *cmd;
706 struct core_conn_create_data data;
707
708 data.length = params_len + sizeof(struct nci_core_conn_create_cmd);
709 cmd = kzalloc(data.length, GFP_KERNEL);
710 if (!cmd)
711 return -ENOMEM;
712
713 cmd->destination_type = destination_type;
714 cmd->number_destination_params = number_destination_params;
715
716 data.cmd = cmd;
717
718 if (params) {
719 memcpy(cmd->params, params, params_len);
720 if (params->length > 0)
721 memcpy(&ndev->cur_params,
722 &params->value[DEST_SPEC_PARAMS_ID_INDEX],
723 sizeof(struct dest_spec_params));
724 else
725 ndev->cur_params.id = 0;
726 } else {
727 ndev->cur_params.id = 0;
728 }
729 ndev->cur_dest_type = destination_type;
730
731 r = __nci_request(ndev, nci_core_conn_create_req, &data,
732 msecs_to_jiffies(NCI_CMD_TIMEOUT));
733 kfree(cmd);
734 return r;
735 }
736 EXPORT_SYMBOL(nci_core_conn_create);
737
738 static void nci_core_conn_close_req(struct nci_dev *ndev, const void *opt)
739 {
740 __u8 conn_id = (unsigned long)opt;
741
742 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CLOSE_CMD, 1, &conn_id);
743 }
744
745 int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id)
746 {
747 unsigned long opt = conn_id;
748
749 ndev->cur_conn_id = conn_id;
750 return __nci_request(ndev, nci_core_conn_close_req, (void *)opt,
751 msecs_to_jiffies(NCI_CMD_TIMEOUT));
752 }
753 EXPORT_SYMBOL(nci_core_conn_close);
754
755 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
756 {
757 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
758 struct nci_set_config_param param;
759 int rc;
760
761 param.val = nfc_get_local_general_bytes(nfc_dev, &param.len);
762 if ((param.val == NULL) || (param.len == 0))
763 return 0;
764
765 if (param.len > NFC_MAX_GT_LEN)
766 return -EINVAL;
767
768 param.id = NCI_PN_ATR_REQ_GEN_BYTES;
769
770 rc = nci_request(ndev, nci_set_config_req, &param,
771 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
772 if (rc)
773 return rc;
774
775 param.id = NCI_LN_ATR_RES_GEN_BYTES;
776
777 return nci_request(ndev, nci_set_config_req, &param,
778 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
779 }
780
781 static int nci_set_listen_parameters(struct nfc_dev *nfc_dev)
782 {
783 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
784 int rc;
785 __u8 val;
786
787 val = NCI_LA_SEL_INFO_NFC_DEP_MASK;
788
789 rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val);
790 if (rc)
791 return rc;
792
793 val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK;
794
795 rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val);
796 if (rc)
797 return rc;
798
799 val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424;
800
801 return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val);
802 }
803
804 static int nci_start_poll(struct nfc_dev *nfc_dev,
805 __u32 im_protocols, __u32 tm_protocols)
806 {
807 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
808 struct nci_rf_discover_param param;
809 int rc;
810
811 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
812 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
813 pr_err("unable to start poll, since poll is already active\n");
814 return -EBUSY;
815 }
816
817 if (ndev->target_active_prot) {
818 pr_err("there is an active target\n");
819 return -EBUSY;
820 }
821
822 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
823 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
824 pr_debug("target active or w4 select, implicitly deactivate\n");
825
826 rc = nci_request(ndev, nci_rf_deactivate_req,
827 (void *)NCI_DEACTIVATE_TYPE_IDLE_MODE,
828 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
829 if (rc)
830 return -EBUSY;
831 }
832
833 if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
834 rc = nci_set_local_general_bytes(nfc_dev);
835 if (rc) {
836 pr_err("failed to set local general bytes\n");
837 return rc;
838 }
839 }
840
841 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
842 rc = nci_set_listen_parameters(nfc_dev);
843 if (rc)
844 pr_err("failed to set listen parameters\n");
845 }
846
847 param.im_protocols = im_protocols;
848 param.tm_protocols = tm_protocols;
849 rc = nci_request(ndev, nci_rf_discover_req, &param,
850 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
851
852 if (!rc)
853 ndev->poll_prots = im_protocols;
854
855 return rc;
856 }
857
858 static void nci_stop_poll(struct nfc_dev *nfc_dev)
859 {
860 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
861
862 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
863 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
864 pr_err("unable to stop poll, since poll is not active\n");
865 return;
866 }
867
868 nci_request(ndev, nci_rf_deactivate_req,
869 (void *)NCI_DEACTIVATE_TYPE_IDLE_MODE,
870 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
871 }
872
873 static int nci_activate_target(struct nfc_dev *nfc_dev,
874 struct nfc_target *target, __u32 protocol)
875 {
876 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
877 struct nci_rf_discover_select_param param;
878 const struct nfc_target *nci_target = NULL;
879 int i;
880 int rc = 0;
881
882 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
883
884 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
885 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
886 pr_err("there is no available target to activate\n");
887 return -EINVAL;
888 }
889
890 if (ndev->target_active_prot) {
891 pr_err("there is already an active target\n");
892 return -EBUSY;
893 }
894
895 for (i = 0; i < ndev->n_targets; i++) {
896 if (ndev->targets[i].idx == target->idx) {
897 nci_target = &ndev->targets[i];
898 break;
899 }
900 }
901
902 if (!nci_target) {
903 pr_err("unable to find the selected target\n");
904 return -EINVAL;
905 }
906
907 if (!(nci_target->supported_protocols & (1 << protocol))) {
908 pr_err("target does not support the requested protocol 0x%x\n",
909 protocol);
910 return -EINVAL;
911 }
912
913 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
914 param.rf_discovery_id = nci_target->logical_idx;
915
916 if (protocol == NFC_PROTO_JEWEL)
917 param.rf_protocol = NCI_RF_PROTOCOL_T1T;
918 else if (protocol == NFC_PROTO_MIFARE)
919 param.rf_protocol = NCI_RF_PROTOCOL_T2T;
920 else if (protocol == NFC_PROTO_FELICA)
921 param.rf_protocol = NCI_RF_PROTOCOL_T3T;
922 else if (protocol == NFC_PROTO_ISO14443 ||
923 protocol == NFC_PROTO_ISO14443_B)
924 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
925 else
926 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
927
928 rc = nci_request(ndev, nci_rf_discover_select_req, &param,
929 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
930 }
931
932 if (!rc)
933 ndev->target_active_prot = protocol;
934
935 return rc;
936 }
937
938 static void nci_deactivate_target(struct nfc_dev *nfc_dev,
939 struct nfc_target *target,
940 __u8 mode)
941 {
942 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
943 unsigned long nci_mode = NCI_DEACTIVATE_TYPE_IDLE_MODE;
944
945 pr_debug("entry\n");
946
947 if (!ndev->target_active_prot) {
948 pr_err("unable to deactivate target, no active target\n");
949 return;
950 }
951
952 ndev->target_active_prot = 0;
953
954 switch (mode) {
955 case NFC_TARGET_MODE_SLEEP:
956 nci_mode = NCI_DEACTIVATE_TYPE_SLEEP_MODE;
957 break;
958 }
959
960 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
961 nci_request(ndev, nci_rf_deactivate_req, (void *)nci_mode,
962 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
963 }
964 }
965
966 static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
967 __u8 comm_mode, __u8 *gb, size_t gb_len)
968 {
969 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
970 int rc;
971
972 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
973
974 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
975 if (rc)
976 return rc;
977
978 rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
979 ndev->remote_gb_len);
980 if (!rc)
981 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
982 NFC_RF_INITIATOR);
983
984 return rc;
985 }
986
987 static int nci_dep_link_down(struct nfc_dev *nfc_dev)
988 {
989 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
990 int rc;
991
992 pr_debug("entry\n");
993
994 if (nfc_dev->rf_mode == NFC_RF_INITIATOR) {
995 nci_deactivate_target(nfc_dev, NULL, NCI_DEACTIVATE_TYPE_IDLE_MODE);
996 } else {
997 if (atomic_read(&ndev->state) == NCI_LISTEN_ACTIVE ||
998 atomic_read(&ndev->state) == NCI_DISCOVERY) {
999 nci_request(ndev, nci_rf_deactivate_req, (void *)0,
1000 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
1001 }
1002
1003 rc = nfc_tm_deactivated(nfc_dev);
1004 if (rc)
1005 pr_err("error when signaling tm deactivation\n");
1006 }
1007
1008 return 0;
1009 }
1010
1011
1012 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
1013 struct sk_buff *skb,
1014 data_exchange_cb_t cb, void *cb_context)
1015 {
1016 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1017 int rc;
1018 struct nci_conn_info *conn_info;
1019
1020 conn_info = ndev->rf_conn_info;
1021 if (!conn_info)
1022 return -EPROTO;
1023
1024 pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
1025
1026 if (!ndev->target_active_prot) {
1027 pr_err("unable to exchange data, no active target\n");
1028 return -EINVAL;
1029 }
1030
1031 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1032 return -EBUSY;
1033
1034 /* store cb and context to be used on receiving data */
1035 conn_info->data_exchange_cb = cb;
1036 conn_info->data_exchange_cb_context = cb_context;
1037
1038 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
1039 if (rc)
1040 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
1041
1042 return rc;
1043 }
1044
1045 static int nci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
1046 {
1047 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1048 int rc;
1049
1050 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
1051 if (rc)
1052 pr_err("unable to send data\n");
1053
1054 return rc;
1055 }
1056
1057 static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
1058 {
1059 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1060
1061 if (ndev->ops->enable_se)
1062 return ndev->ops->enable_se(ndev, se_idx);
1063
1064 return 0;
1065 }
1066
1067 static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
1068 {
1069 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1070
1071 if (ndev->ops->disable_se)
1072 return ndev->ops->disable_se(ndev, se_idx);
1073
1074 return 0;
1075 }
1076
1077 static int nci_discover_se(struct nfc_dev *nfc_dev)
1078 {
1079 int r;
1080 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1081
1082 if (ndev->ops->discover_se) {
1083 r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE);
1084 if (r != NCI_STATUS_OK)
1085 return -EPROTO;
1086
1087 return ndev->ops->discover_se(ndev);
1088 }
1089
1090 return 0;
1091 }
1092
1093 static int nci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
1094 u8 *apdu, size_t apdu_length,
1095 se_io_cb_t cb, void *cb_context)
1096 {
1097 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1098
1099 if (ndev->ops->se_io)
1100 return ndev->ops->se_io(ndev, se_idx, apdu,
1101 apdu_length, cb, cb_context);
1102
1103 return 0;
1104 }
1105
1106 static int nci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
1107 {
1108 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1109
1110 if (!ndev->ops->fw_download)
1111 return -ENOTSUPP;
1112
1113 return ndev->ops->fw_download(ndev, firmware_name);
1114 }
1115
1116 static const struct nfc_ops nci_nfc_ops = {
1117 .dev_up = nci_dev_up,
1118 .dev_down = nci_dev_down,
1119 .start_poll = nci_start_poll,
1120 .stop_poll = nci_stop_poll,
1121 .dep_link_up = nci_dep_link_up,
1122 .dep_link_down = nci_dep_link_down,
1123 .activate_target = nci_activate_target,
1124 .deactivate_target = nci_deactivate_target,
1125 .im_transceive = nci_transceive,
1126 .tm_send = nci_tm_send,
1127 .enable_se = nci_enable_se,
1128 .disable_se = nci_disable_se,
1129 .discover_se = nci_discover_se,
1130 .se_io = nci_se_io,
1131 .fw_download = nci_fw_download,
1132 };
1133
1134 /* ---- Interface to NCI drivers ---- */
1135 /**
1136 * nci_allocate_device - allocate a new nci device
1137 *
1138 * @ops: device operations
1139 * @supported_protocols: NFC protocols supported by the device
1140 * @tx_headroom: Reserved space at beginning of skb
1141 * @tx_tailroom: Reserved space at end of skb
1142 */
1143 struct nci_dev *nci_allocate_device(const struct nci_ops *ops,
1144 __u32 supported_protocols,
1145 int tx_headroom, int tx_tailroom)
1146 {
1147 struct nci_dev *ndev;
1148
1149 pr_debug("supported_protocols 0x%x\n", supported_protocols);
1150
1151 if (!ops->open || !ops->close || !ops->send)
1152 return NULL;
1153
1154 if (!supported_protocols)
1155 return NULL;
1156
1157 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
1158 if (!ndev)
1159 return NULL;
1160
1161 ndev->ops = ops;
1162
1163 if (ops->n_prop_ops > NCI_MAX_PROPRIETARY_CMD) {
1164 pr_err("Too many proprietary commands: %zd\n",
1165 ops->n_prop_ops);
1166 goto free_nci;
1167 }
1168
1169 ndev->tx_headroom = tx_headroom;
1170 ndev->tx_tailroom = tx_tailroom;
1171 init_completion(&ndev->req_completion);
1172
1173 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
1174 supported_protocols,
1175 tx_headroom + NCI_DATA_HDR_SIZE,
1176 tx_tailroom);
1177 if (!ndev->nfc_dev)
1178 goto free_nci;
1179
1180 ndev->hci_dev = nci_hci_allocate(ndev);
1181 if (!ndev->hci_dev)
1182 goto free_nfc;
1183
1184 nfc_set_drvdata(ndev->nfc_dev, ndev);
1185
1186 return ndev;
1187
1188 free_nfc:
1189 nfc_free_device(ndev->nfc_dev);
1190 free_nci:
1191 kfree(ndev);
1192 return NULL;
1193 }
1194 EXPORT_SYMBOL(nci_allocate_device);
1195
1196 /**
1197 * nci_free_device - deallocate nci device
1198 *
1199 * @ndev: The nci device to deallocate
1200 */
1201 void nci_free_device(struct nci_dev *ndev)
1202 {
1203 nfc_free_device(ndev->nfc_dev);
1204 nci_hci_deallocate(ndev);
1205 kfree(ndev);
1206 }
1207 EXPORT_SYMBOL(nci_free_device);
1208
1209 /**
1210 * nci_register_device - register a nci device in the nfc subsystem
1211 *
1212 * @ndev: The nci device to register
1213 */
1214 int nci_register_device(struct nci_dev *ndev)
1215 {
1216 int rc;
1217 struct device *dev = &ndev->nfc_dev->dev;
1218 char name[32];
1219
1220 ndev->flags = 0;
1221
1222 INIT_WORK(&ndev->cmd_work, nci_cmd_work);
1223 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
1224 ndev->cmd_wq = create_singlethread_workqueue(name);
1225 if (!ndev->cmd_wq) {
1226 rc = -ENOMEM;
1227 goto exit;
1228 }
1229
1230 INIT_WORK(&ndev->rx_work, nci_rx_work);
1231 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
1232 ndev->rx_wq = create_singlethread_workqueue(name);
1233 if (!ndev->rx_wq) {
1234 rc = -ENOMEM;
1235 goto destroy_cmd_wq_exit;
1236 }
1237
1238 INIT_WORK(&ndev->tx_work, nci_tx_work);
1239 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
1240 ndev->tx_wq = create_singlethread_workqueue(name);
1241 if (!ndev->tx_wq) {
1242 rc = -ENOMEM;
1243 goto destroy_rx_wq_exit;
1244 }
1245
1246 skb_queue_head_init(&ndev->cmd_q);
1247 skb_queue_head_init(&ndev->rx_q);
1248 skb_queue_head_init(&ndev->tx_q);
1249
1250 timer_setup(&ndev->cmd_timer, nci_cmd_timer, 0);
1251 timer_setup(&ndev->data_timer, nci_data_timer, 0);
1252
1253 mutex_init(&ndev->req_lock);
1254 INIT_LIST_HEAD(&ndev->conn_info_list);
1255
1256 rc = nfc_register_device(ndev->nfc_dev);
1257 if (rc)
1258 goto destroy_tx_wq_exit;
1259
1260 goto exit;
1261
1262 destroy_tx_wq_exit:
1263 destroy_workqueue(ndev->tx_wq);
1264
1265 destroy_rx_wq_exit:
1266 destroy_workqueue(ndev->rx_wq);
1267
1268 destroy_cmd_wq_exit:
1269 destroy_workqueue(ndev->cmd_wq);
1270
1271 exit:
1272 return rc;
1273 }
1274 EXPORT_SYMBOL(nci_register_device);
1275
1276 /**
1277 * nci_unregister_device - unregister a nci device in the nfc subsystem
1278 *
1279 * @ndev: The nci device to unregister
1280 */
1281 void nci_unregister_device(struct nci_dev *ndev)
1282 {
1283 struct nci_conn_info *conn_info, *n;
1284
1285 /* This set_bit is not protected with specialized barrier,
1286 * However, it is fine because the mutex_lock(&ndev->req_lock);
1287 * in nci_close_device() will help to emit one.
1288 */
1289 set_bit(NCI_UNREG, &ndev->flags);
1290
1291 nci_close_device(ndev);
1292
1293 destroy_workqueue(ndev->cmd_wq);
1294 destroy_workqueue(ndev->rx_wq);
1295 destroy_workqueue(ndev->tx_wq);
1296
1297 list_for_each_entry_safe(conn_info, n, &ndev->conn_info_list, list) {
1298 list_del(&conn_info->list);
1299 /* conn_info is allocated with devm_kzalloc */
1300 }
1301
1302 nfc_unregister_device(ndev->nfc_dev);
1303 }
1304 EXPORT_SYMBOL(nci_unregister_device);
1305
1306 /**
1307 * nci_recv_frame - receive frame from NCI drivers
1308 *
1309 * @ndev: The nci device
1310 * @skb: The sk_buff to receive
1311 */
1312 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
1313 {
1314 pr_debug("len %d\n", skb->len);
1315
1316 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
1317 !test_bit(NCI_INIT, &ndev->flags))) {
1318 kfree_skb(skb);
1319 return -ENXIO;
1320 }
1321
1322 /* Queue frame for rx worker thread */
1323 skb_queue_tail(&ndev->rx_q, skb);
1324 queue_work(ndev->rx_wq, &ndev->rx_work);
1325
1326 return 0;
1327 }
1328 EXPORT_SYMBOL(nci_recv_frame);
1329
1330 int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
1331 {
1332 pr_debug("len %d\n", skb->len);
1333
1334 if (!ndev) {
1335 kfree_skb(skb);
1336 return -ENODEV;
1337 }
1338
1339 /* Get rid of skb owner, prior to sending to the driver. */
1340 skb_orphan(skb);
1341
1342 /* Send copy to sniffer */
1343 nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1344 RAW_PAYLOAD_NCI, NFC_DIRECTION_TX);
1345
1346 return ndev->ops->send(ndev, skb);
1347 }
1348 EXPORT_SYMBOL(nci_send_frame);
1349
1350 /* Send NCI command */
1351 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, const void *payload)
1352 {
1353 struct nci_ctrl_hdr *hdr;
1354 struct sk_buff *skb;
1355
1356 pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
1357
1358 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
1359 if (!skb) {
1360 pr_err("no memory for command\n");
1361 return -ENOMEM;
1362 }
1363
1364 hdr = skb_put(skb, NCI_CTRL_HDR_SIZE);
1365 hdr->gid = nci_opcode_gid(opcode);
1366 hdr->oid = nci_opcode_oid(opcode);
1367 hdr->plen = plen;
1368
1369 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
1370 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
1371
1372 if (plen)
1373 skb_put_data(skb, payload, plen);
1374
1375 skb_queue_tail(&ndev->cmd_q, skb);
1376 queue_work(ndev->cmd_wq, &ndev->cmd_work);
1377
1378 return 0;
1379 }
1380 EXPORT_SYMBOL(nci_send_cmd);
1381
1382 /* Proprietary commands API */
1383 static const struct nci_driver_ops *ops_cmd_lookup(const struct nci_driver_ops *ops,
1384 size_t n_ops,
1385 __u16 opcode)
1386 {
1387 size_t i;
1388 const struct nci_driver_ops *op;
1389
1390 if (!ops || !n_ops)
1391 return NULL;
1392
1393 for (i = 0; i < n_ops; i++) {
1394 op = &ops[i];
1395 if (op->opcode == opcode)
1396 return op;
1397 }
1398
1399 return NULL;
1400 }
1401
1402 static int nci_op_rsp_packet(struct nci_dev *ndev, __u16 rsp_opcode,
1403 struct sk_buff *skb, const struct nci_driver_ops *ops,
1404 size_t n_ops)
1405 {
1406 const struct nci_driver_ops *op;
1407
1408 op = ops_cmd_lookup(ops, n_ops, rsp_opcode);
1409 if (!op || !op->rsp)
1410 return -ENOTSUPP;
1411
1412 return op->rsp(ndev, skb);
1413 }
1414
1415 static int nci_op_ntf_packet(struct nci_dev *ndev, __u16 ntf_opcode,
1416 struct sk_buff *skb, const struct nci_driver_ops *ops,
1417 size_t n_ops)
1418 {
1419 const struct nci_driver_ops *op;
1420
1421 op = ops_cmd_lookup(ops, n_ops, ntf_opcode);
1422 if (!op || !op->ntf)
1423 return -ENOTSUPP;
1424
1425 return op->ntf(ndev, skb);
1426 }
1427
1428 int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1429 struct sk_buff *skb)
1430 {
1431 return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->prop_ops,
1432 ndev->ops->n_prop_ops);
1433 }
1434
1435 int nci_prop_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1436 struct sk_buff *skb)
1437 {
1438 return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->prop_ops,
1439 ndev->ops->n_prop_ops);
1440 }
1441
1442 int nci_core_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1443 struct sk_buff *skb)
1444 {
1445 return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->core_ops,
1446 ndev->ops->n_core_ops);
1447 }
1448
1449 int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1450 struct sk_buff *skb)
1451 {
1452 return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->core_ops,
1453 ndev->ops->n_core_ops);
1454 }
1455
1456 /* ---- NCI TX Data worker thread ---- */
1457
1458 static void nci_tx_work(struct work_struct *work)
1459 {
1460 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
1461 struct nci_conn_info *conn_info;
1462 struct sk_buff *skb;
1463
1464 conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
1465 if (!conn_info)
1466 return;
1467
1468 pr_debug("credits_cnt %d\n", atomic_read(&conn_info->credits_cnt));
1469
1470 /* Send queued tx data */
1471 while (atomic_read(&conn_info->credits_cnt)) {
1472 skb = skb_dequeue(&ndev->tx_q);
1473 if (!skb)
1474 return;
1475
1476 /* Check if data flow control is used */
1477 if (atomic_read(&conn_info->credits_cnt) !=
1478 NCI_DATA_FLOW_CONTROL_NOT_USED)
1479 atomic_dec(&conn_info->credits_cnt);
1480
1481 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
1482 nci_pbf(skb->data),
1483 nci_conn_id(skb->data),
1484 nci_plen(skb->data));
1485
1486 nci_send_frame(ndev, skb);
1487
1488 mod_timer(&ndev->data_timer,
1489 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
1490 }
1491 }
1492
1493 /* ----- NCI RX worker thread (data & control) ----- */
1494
1495 static void nci_rx_work(struct work_struct *work)
1496 {
1497 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
1498 struct sk_buff *skb;
1499
1500 while ((skb = skb_dequeue(&ndev->rx_q))) {
1501
1502 /* Send copy to sniffer */
1503 nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1504 RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
1505
1506 /* Process frame */
1507 switch (nci_mt(skb->data)) {
1508 case NCI_MT_RSP_PKT:
1509 nci_rsp_packet(ndev, skb);
1510 break;
1511
1512 case NCI_MT_NTF_PKT:
1513 nci_ntf_packet(ndev, skb);
1514 break;
1515
1516 case NCI_MT_DATA_PKT:
1517 nci_rx_data_packet(ndev, skb);
1518 break;
1519
1520 default:
1521 pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
1522 kfree_skb(skb);
1523 break;
1524 }
1525 }
1526
1527 /* check if a data exchange timeout has occurred */
1528 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
1529 /* complete the data exchange transaction, if exists */
1530 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1531 nci_data_exchange_complete(ndev, NULL,
1532 ndev->cur_conn_id,
1533 -ETIMEDOUT);
1534
1535 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
1536 }
1537 }
1538
1539 /* ----- NCI TX CMD worker thread ----- */
1540
1541 static void nci_cmd_work(struct work_struct *work)
1542 {
1543 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
1544 struct sk_buff *skb;
1545
1546 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
1547
1548 /* Send queued command */
1549 if (atomic_read(&ndev->cmd_cnt)) {
1550 skb = skb_dequeue(&ndev->cmd_q);
1551 if (!skb)
1552 return;
1553
1554 atomic_dec(&ndev->cmd_cnt);
1555
1556 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
1557 nci_pbf(skb->data),
1558 nci_opcode_gid(nci_opcode(skb->data)),
1559 nci_opcode_oid(nci_opcode(skb->data)),
1560 nci_plen(skb->data));
1561
1562 nci_send_frame(ndev, skb);
1563
1564 mod_timer(&ndev->cmd_timer,
1565 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
1566 }
1567 }
1568
1569 MODULE_LICENSE("GPL");
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