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