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drm/i915: Reduce locking inside swfinish ioctl
[linux/fpc-iii.git] / net / nfc / nci / core.c
blob61fff422424f7405e4f39f0d6ed01f32c8ffdbb1
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 if (conn_info) {
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
84 return -EINVAL;
85 }
86 EXPORT_SYMBOL(nci_get_conn_info_by_dest_type_params);
87
88 /* ---- NCI requests ---- */
89
90 void nci_req_complete(struct nci_dev *ndev, int result)
91 {
92 if (ndev->req_status == NCI_REQ_PEND) {
93 ndev->req_result = result;
94 ndev->req_status = NCI_REQ_DONE;
95 complete(&ndev->req_completion);
96 }
97 }
98 EXPORT_SYMBOL(nci_req_complete);
99
100 static void nci_req_cancel(struct nci_dev *ndev, int err)
101 {
102 if (ndev->req_status == NCI_REQ_PEND) {
103 ndev->req_result = err;
104 ndev->req_status = NCI_REQ_CANCELED;
105 complete(&ndev->req_completion);
106 }
107 }
108
109 /* Execute request and wait for completion. */
110 static int __nci_request(struct nci_dev *ndev,
111 void (*req)(struct nci_dev *ndev, unsigned long opt),
112 unsigned long opt, __u32 timeout)
113 {
114 int rc = 0;
115 long completion_rc;
116
117 ndev->req_status = NCI_REQ_PEND;
118
119 reinit_completion(&ndev->req_completion);
120 req(ndev, opt);
121 completion_rc =
122 wait_for_completion_interruptible_timeout(&ndev->req_completion,
123 timeout);
124
125 pr_debug("wait_for_completion return %ld\n", completion_rc);
126
127 if (completion_rc > 0) {
128 switch (ndev->req_status) {
129 case NCI_REQ_DONE:
130 rc = nci_to_errno(ndev->req_result);
131 break;
132
133 case NCI_REQ_CANCELED:
134 rc = -ndev->req_result;
135 break;
136
137 default:
138 rc = -ETIMEDOUT;
139 break;
140 }
141 } else {
142 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
143 completion_rc);
144
145 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
146 }
147
148 ndev->req_status = ndev->req_result = 0;
149
150 return rc;
151 }
152
153 inline int nci_request(struct nci_dev *ndev,
154 void (*req)(struct nci_dev *ndev,
155 unsigned long opt),
156 unsigned long opt, __u32 timeout)
157 {
158 int rc;
159
160 if (!test_bit(NCI_UP, &ndev->flags))
161 return -ENETDOWN;
162
163 /* Serialize all requests */
164 mutex_lock(&ndev->req_lock);
165 rc = __nci_request(ndev, req, opt, timeout);
166 mutex_unlock(&ndev->req_lock);
167
168 return rc;
169 }
170
171 static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
172 {
173 struct nci_core_reset_cmd cmd;
174
175 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
176 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
177 }
178
179 static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
180 {
181 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
182 }
183
184 static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
185 {
186 struct nci_rf_disc_map_cmd cmd;
187 struct disc_map_config *cfg = cmd.mapping_configs;
188 __u8 *num = &cmd.num_mapping_configs;
189 int i;
190
191 /* set rf mapping configurations */
192 *num = 0;
193
194 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */
195 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
196 if (ndev->supported_rf_interfaces[i] ==
197 NCI_RF_INTERFACE_ISO_DEP) {
198 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
199 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
200 NCI_DISC_MAP_MODE_LISTEN;
201 cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
202 (*num)++;
203 } else if (ndev->supported_rf_interfaces[i] ==
204 NCI_RF_INTERFACE_NFC_DEP) {
205 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
206 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
207 NCI_DISC_MAP_MODE_LISTEN;
208 cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
209 (*num)++;
210 }
211
212 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
213 break;
214 }
215
216 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
217 (1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
218 }
219
220 struct nci_set_config_param {
221 __u8 id;
222 size_t len;
223 __u8 *val;
224 };
225
226 static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt)
227 {
228 struct nci_set_config_param *param = (struct nci_set_config_param *)opt;
229 struct nci_core_set_config_cmd cmd;
230
231 BUG_ON(param->len > NCI_MAX_PARAM_LEN);
232
233 cmd.num_params = 1;
234 cmd.param.id = param->id;
235 cmd.param.len = param->len;
236 memcpy(cmd.param.val, param->val, param->len);
237
238 nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd);
239 }
240
241 struct nci_rf_discover_param {
242 __u32 im_protocols;
243 __u32 tm_protocols;
244 };
245
246 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
247 {
248 struct nci_rf_discover_param *param =
249 (struct nci_rf_discover_param *)opt;
250 struct nci_rf_disc_cmd cmd;
251
252 cmd.num_disc_configs = 0;
253
254 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
255 (param->im_protocols & NFC_PROTO_JEWEL_MASK ||
256 param->im_protocols & NFC_PROTO_MIFARE_MASK ||
257 param->im_protocols & NFC_PROTO_ISO14443_MASK ||
258 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
259 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
260 NCI_NFC_A_PASSIVE_POLL_MODE;
261 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
262 cmd.num_disc_configs++;
263 }
264
265 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
266 (param->im_protocols & NFC_PROTO_ISO14443_B_MASK)) {
267 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
268 NCI_NFC_B_PASSIVE_POLL_MODE;
269 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
270 cmd.num_disc_configs++;
271 }
272
273 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
274 (param->im_protocols & NFC_PROTO_FELICA_MASK ||
275 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
276 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
277 NCI_NFC_F_PASSIVE_POLL_MODE;
278 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
279 cmd.num_disc_configs++;
280 }
281
282 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
283 (param->im_protocols & NFC_PROTO_ISO15693_MASK)) {
284 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
285 NCI_NFC_V_PASSIVE_POLL_MODE;
286 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
287 cmd.num_disc_configs++;
288 }
289
290 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS - 1) &&
291 (param->tm_protocols & NFC_PROTO_NFC_DEP_MASK)) {
292 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
293 NCI_NFC_A_PASSIVE_LISTEN_MODE;
294 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
295 cmd.num_disc_configs++;
296 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
297 NCI_NFC_F_PASSIVE_LISTEN_MODE;
298 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
299 cmd.num_disc_configs++;
300 }
301
302 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
303 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
304 &cmd);
305 }
306
307 struct nci_rf_discover_select_param {
308 __u8 rf_discovery_id;
309 __u8 rf_protocol;
310 };
311
312 static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
313 {
314 struct nci_rf_discover_select_param *param =
315 (struct nci_rf_discover_select_param *)opt;
316 struct nci_rf_discover_select_cmd cmd;
317
318 cmd.rf_discovery_id = param->rf_discovery_id;
319 cmd.rf_protocol = param->rf_protocol;
320
321 switch (cmd.rf_protocol) {
322 case NCI_RF_PROTOCOL_ISO_DEP:
323 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
324 break;
325
326 case NCI_RF_PROTOCOL_NFC_DEP:
327 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
328 break;
329
330 default:
331 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
332 break;
333 }
334
335 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
336 sizeof(struct nci_rf_discover_select_cmd), &cmd);
337 }
338
339 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
340 {
341 struct nci_rf_deactivate_cmd cmd;
342
343 cmd.type = opt;
344
345 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
346 sizeof(struct nci_rf_deactivate_cmd), &cmd);
347 }
348
349 struct nci_cmd_param {
350 __u16 opcode;
351 size_t len;
352 __u8 *payload;
353 };
354
355 static void nci_generic_req(struct nci_dev *ndev, unsigned long opt)
356 {
357 struct nci_cmd_param *param =
358 (struct nci_cmd_param *)opt;
359
360 nci_send_cmd(ndev, param->opcode, param->len, param->payload);
361 }
362
363 int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, __u8 *payload)
364 {
365 struct nci_cmd_param param;
366
367 param.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY, oid);
368 param.len = len;
369 param.payload = payload;
370
371 return __nci_request(ndev, nci_generic_req, (unsigned long)&param,
372 msecs_to_jiffies(NCI_CMD_TIMEOUT));
373 }
374 EXPORT_SYMBOL(nci_prop_cmd);
375
376 int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len, __u8 *payload)
377 {
378 struct nci_cmd_param param;
379
380 param.opcode = opcode;
381 param.len = len;
382 param.payload = payload;
383
384 return __nci_request(ndev, nci_generic_req, (unsigned long)&param,
385 msecs_to_jiffies(NCI_CMD_TIMEOUT));
386 }
387 EXPORT_SYMBOL(nci_core_cmd);
388
389 int nci_core_reset(struct nci_dev *ndev)
390 {
391 return __nci_request(ndev, nci_reset_req, 0,
392 msecs_to_jiffies(NCI_RESET_TIMEOUT));
393 }
394 EXPORT_SYMBOL(nci_core_reset);
395
396 int nci_core_init(struct nci_dev *ndev)
397 {
398 return __nci_request(ndev, nci_init_req, 0,
399 msecs_to_jiffies(NCI_INIT_TIMEOUT));
400 }
401 EXPORT_SYMBOL(nci_core_init);
402
403 struct nci_loopback_data {
404 u8 conn_id;
405 struct sk_buff *data;
406 };
407
408 static void nci_send_data_req(struct nci_dev *ndev, unsigned long opt)
409 {
410 struct nci_loopback_data *data = (struct nci_loopback_data *)opt;
411
412 nci_send_data(ndev, data->conn_id, data->data);
413 }
414
415 static void nci_nfcc_loopback_cb(void *context, struct sk_buff *skb, int err)
416 {
417 struct nci_dev *ndev = (struct nci_dev *)context;
418 struct nci_conn_info *conn_info;
419
420 conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
421 if (!conn_info) {
422 nci_req_complete(ndev, NCI_STATUS_REJECTED);
423 return;
424 }
425
426 conn_info->rx_skb = skb;
427
428 nci_req_complete(ndev, NCI_STATUS_OK);
429 }
430
431 int nci_nfcc_loopback(struct nci_dev *ndev, void *data, size_t data_len,
432 struct sk_buff **resp)
433 {
434 int r;
435 struct nci_loopback_data loopback_data;
436 struct nci_conn_info *conn_info;
437 struct sk_buff *skb;
438 int conn_id = nci_get_conn_info_by_dest_type_params(ndev,
439 NCI_DESTINATION_NFCC_LOOPBACK, NULL);
440
441 if (conn_id < 0) {
442 r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCC_LOOPBACK,
443 0, 0, NULL);
444 if (r != NCI_STATUS_OK)
445 return r;
446
447 conn_id = nci_get_conn_info_by_dest_type_params(ndev,
448 NCI_DESTINATION_NFCC_LOOPBACK,
449 NULL);
450 }
451
452 conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
453 if (!conn_info)
454 return -EPROTO;
455
456 /* store cb and context to be used on receiving data */
457 conn_info->data_exchange_cb = nci_nfcc_loopback_cb;
458 conn_info->data_exchange_cb_context = ndev;
459
460 skb = nci_skb_alloc(ndev, NCI_DATA_HDR_SIZE + data_len, GFP_KERNEL);
461 if (!skb)
462 return -ENOMEM;
463
464 skb_reserve(skb, NCI_DATA_HDR_SIZE);
465 memcpy(skb_put(skb, data_len), data, data_len);
466
467 loopback_data.conn_id = conn_id;
468 loopback_data.data = skb;
469
470 ndev->cur_conn_id = conn_id;
471 r = nci_request(ndev, nci_send_data_req, (unsigned long)&loopback_data,
472 msecs_to_jiffies(NCI_DATA_TIMEOUT));
473 if (r == NCI_STATUS_OK && resp)
474 *resp = conn_info->rx_skb;
475
476 return r;
477 }
478 EXPORT_SYMBOL(nci_nfcc_loopback);
479
480 static int nci_open_device(struct nci_dev *ndev)
481 {
482 int rc = 0;
483
484 mutex_lock(&ndev->req_lock);
485
486 if (test_bit(NCI_UP, &ndev->flags)) {
487 rc = -EALREADY;
488 goto done;
489 }
490
491 if (ndev->ops->open(ndev)) {
492 rc = -EIO;
493 goto done;
494 }
495
496 atomic_set(&ndev->cmd_cnt, 1);
497
498 set_bit(NCI_INIT, &ndev->flags);
499
500 if (ndev->ops->init)
501 rc = ndev->ops->init(ndev);
502
503 if (!rc) {
504 rc = __nci_request(ndev, nci_reset_req, 0,
505 msecs_to_jiffies(NCI_RESET_TIMEOUT));
506 }
507
508 if (!rc && ndev->ops->setup) {
509 rc = ndev->ops->setup(ndev);
510 }
511
512 if (!rc) {
513 rc = __nci_request(ndev, nci_init_req, 0,
514 msecs_to_jiffies(NCI_INIT_TIMEOUT));
515 }
516
517 if (!rc && ndev->ops->post_setup)
518 rc = ndev->ops->post_setup(ndev);
519
520 if (!rc) {
521 rc = __nci_request(ndev, nci_init_complete_req, 0,
522 msecs_to_jiffies(NCI_INIT_TIMEOUT));
523 }
524
525 clear_bit(NCI_INIT, &ndev->flags);
526
527 if (!rc) {
528 set_bit(NCI_UP, &ndev->flags);
529 nci_clear_target_list(ndev);
530 atomic_set(&ndev->state, NCI_IDLE);
531 } else {
532 /* Init failed, cleanup */
533 skb_queue_purge(&ndev->cmd_q);
534 skb_queue_purge(&ndev->rx_q);
535 skb_queue_purge(&ndev->tx_q);
536
537 ndev->ops->close(ndev);
538 ndev->flags = 0;
539 }
540
541 done:
542 mutex_unlock(&ndev->req_lock);
543 return rc;
544 }
545
546 static int nci_close_device(struct nci_dev *ndev)
547 {
548 nci_req_cancel(ndev, ENODEV);
549 mutex_lock(&ndev->req_lock);
550
551 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
552 del_timer_sync(&ndev->cmd_timer);
553 del_timer_sync(&ndev->data_timer);
554 mutex_unlock(&ndev->req_lock);
555 return 0;
556 }
557
558 /* Drop RX and TX queues */
559 skb_queue_purge(&ndev->rx_q);
560 skb_queue_purge(&ndev->tx_q);
561
562 /* Flush RX and TX wq */
563 flush_workqueue(ndev->rx_wq);
564 flush_workqueue(ndev->tx_wq);
565
566 /* Reset device */
567 skb_queue_purge(&ndev->cmd_q);
568 atomic_set(&ndev->cmd_cnt, 1);
569
570 set_bit(NCI_INIT, &ndev->flags);
571 __nci_request(ndev, nci_reset_req, 0,
572 msecs_to_jiffies(NCI_RESET_TIMEOUT));
573
574 /* After this point our queues are empty
575 * and no works are scheduled.
576 */
577 ndev->ops->close(ndev);
578
579 clear_bit(NCI_INIT, &ndev->flags);
580
581 del_timer_sync(&ndev->cmd_timer);
582
583 /* Flush cmd wq */
584 flush_workqueue(ndev->cmd_wq);
585
586 /* Clear flags */
587 ndev->flags = 0;
588
589 mutex_unlock(&ndev->req_lock);
590
591 return 0;
592 }
593
594 /* NCI command timer function */
595 static void nci_cmd_timer(unsigned long arg)
596 {
597 struct nci_dev *ndev = (void *) arg;
598
599 atomic_set(&ndev->cmd_cnt, 1);
600 queue_work(ndev->cmd_wq, &ndev->cmd_work);
601 }
602
603 /* NCI data exchange timer function */
604 static void nci_data_timer(unsigned long arg)
605 {
606 struct nci_dev *ndev = (void *) arg;
607
608 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
609 queue_work(ndev->rx_wq, &ndev->rx_work);
610 }
611
612 static int nci_dev_up(struct nfc_dev *nfc_dev)
613 {
614 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
615
616 return nci_open_device(ndev);
617 }
618
619 static int nci_dev_down(struct nfc_dev *nfc_dev)
620 {
621 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
622
623 return nci_close_device(ndev);
624 }
625
626 int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val)
627 {
628 struct nci_set_config_param param;
629
630 if (!val || !len)
631 return 0;
632
633 param.id = id;
634 param.len = len;
635 param.val = val;
636
637 return __nci_request(ndev, nci_set_config_req, (unsigned long)&param,
638 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
639 }
640 EXPORT_SYMBOL(nci_set_config);
641
642 static void nci_nfcee_discover_req(struct nci_dev *ndev, unsigned long opt)
643 {
644 struct nci_nfcee_discover_cmd cmd;
645 __u8 action = opt;
646
647 cmd.discovery_action = action;
648
649 nci_send_cmd(ndev, NCI_OP_NFCEE_DISCOVER_CMD, 1, &cmd);
650 }
651
652 int nci_nfcee_discover(struct nci_dev *ndev, u8 action)
653 {
654 return __nci_request(ndev, nci_nfcee_discover_req, action,
655 msecs_to_jiffies(NCI_CMD_TIMEOUT));
656 }
657 EXPORT_SYMBOL(nci_nfcee_discover);
658
659 static void nci_nfcee_mode_set_req(struct nci_dev *ndev, unsigned long opt)
660 {
661 struct nci_nfcee_mode_set_cmd *cmd =
662 (struct nci_nfcee_mode_set_cmd *)opt;
663
664 nci_send_cmd(ndev, NCI_OP_NFCEE_MODE_SET_CMD,
665 sizeof(struct nci_nfcee_mode_set_cmd), cmd);
666 }
667
668 int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode)
669 {
670 struct nci_nfcee_mode_set_cmd cmd;
671
672 cmd.nfcee_id = nfcee_id;
673 cmd.nfcee_mode = nfcee_mode;
674
675 return __nci_request(ndev, nci_nfcee_mode_set_req,
676 (unsigned long)&cmd,
677 msecs_to_jiffies(NCI_CMD_TIMEOUT));
678 }
679 EXPORT_SYMBOL(nci_nfcee_mode_set);
680
681 static void nci_core_conn_create_req(struct nci_dev *ndev, unsigned long opt)
682 {
683 struct core_conn_create_data *data =
684 (struct core_conn_create_data *)opt;
685
686 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, data->length, data->cmd);
687 }
688
689 int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type,
690 u8 number_destination_params,
691 size_t params_len,
692 struct core_conn_create_dest_spec_params *params)
693 {
694 int r;
695 struct nci_core_conn_create_cmd *cmd;
696 struct core_conn_create_data data;
697
698 data.length = params_len + sizeof(struct nci_core_conn_create_cmd);
699 cmd = kzalloc(data.length, GFP_KERNEL);
700 if (!cmd)
701 return -ENOMEM;
702
703 cmd->destination_type = destination_type;
704 cmd->number_destination_params = number_destination_params;
705
706 data.cmd = cmd;
707
708 if (params) {
709 memcpy(cmd->params, params, params_len);
710 if (params->length > 0)
711 memcpy(&ndev->cur_params,
712 &params->value[DEST_SPEC_PARAMS_ID_INDEX],
713 sizeof(struct dest_spec_params));
714 else
715 ndev->cur_params.id = 0;
716 } else {
717 ndev->cur_params.id = 0;
718 }
719 ndev->cur_dest_type = destination_type;
720
721 r = __nci_request(ndev, nci_core_conn_create_req, (unsigned long)&data,
722 msecs_to_jiffies(NCI_CMD_TIMEOUT));
723 kfree(cmd);
724 return r;
725 }
726 EXPORT_SYMBOL(nci_core_conn_create);
727
728 static void nci_core_conn_close_req(struct nci_dev *ndev, unsigned long opt)
729 {
730 __u8 conn_id = opt;
731
732 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CLOSE_CMD, 1, &conn_id);
733 }
734
735 int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id)
736 {
737 ndev->cur_conn_id = conn_id;
738 return __nci_request(ndev, nci_core_conn_close_req, conn_id,
739 msecs_to_jiffies(NCI_CMD_TIMEOUT));
740 }
741 EXPORT_SYMBOL(nci_core_conn_close);
742
743 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
744 {
745 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
746 struct nci_set_config_param param;
747 int rc;
748
749 param.val = nfc_get_local_general_bytes(nfc_dev, &param.len);
750 if ((param.val == NULL) || (param.len == 0))
751 return 0;
752
753 if (param.len > NFC_MAX_GT_LEN)
754 return -EINVAL;
755
756 param.id = NCI_PN_ATR_REQ_GEN_BYTES;
757
758 rc = nci_request(ndev, nci_set_config_req, (unsigned long)&param,
759 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
760 if (rc)
761 return rc;
762
763 param.id = NCI_LN_ATR_RES_GEN_BYTES;
764
765 return nci_request(ndev, nci_set_config_req, (unsigned long)&param,
766 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
767 }
768
769 static int nci_set_listen_parameters(struct nfc_dev *nfc_dev)
770 {
771 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
772 int rc;
773 __u8 val;
774
775 val = NCI_LA_SEL_INFO_NFC_DEP_MASK;
776
777 rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val);
778 if (rc)
779 return rc;
780
781 val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK;
782
783 rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val);
784 if (rc)
785 return rc;
786
787 val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424;
788
789 return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val);
790 }
791
792 static int nci_start_poll(struct nfc_dev *nfc_dev,
793 __u32 im_protocols, __u32 tm_protocols)
794 {
795 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
796 struct nci_rf_discover_param param;
797 int rc;
798
799 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
800 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
801 pr_err("unable to start poll, since poll is already active\n");
802 return -EBUSY;
803 }
804
805 if (ndev->target_active_prot) {
806 pr_err("there is an active target\n");
807 return -EBUSY;
808 }
809
810 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
811 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
812 pr_debug("target active or w4 select, implicitly deactivate\n");
813
814 rc = nci_request(ndev, nci_rf_deactivate_req,
815 NCI_DEACTIVATE_TYPE_IDLE_MODE,
816 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
817 if (rc)
818 return -EBUSY;
819 }
820
821 if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
822 rc = nci_set_local_general_bytes(nfc_dev);
823 if (rc) {
824 pr_err("failed to set local general bytes\n");
825 return rc;
826 }
827 }
828
829 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
830 rc = nci_set_listen_parameters(nfc_dev);
831 if (rc)
832 pr_err("failed to set listen parameters\n");
833 }
834
835 param.im_protocols = im_protocols;
836 param.tm_protocols = tm_protocols;
837 rc = nci_request(ndev, nci_rf_discover_req, (unsigned long)&param,
838 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
839
840 if (!rc)
841 ndev->poll_prots = im_protocols;
842
843 return rc;
844 }
845
846 static void nci_stop_poll(struct nfc_dev *nfc_dev)
847 {
848 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
849
850 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
851 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
852 pr_err("unable to stop poll, since poll is not active\n");
853 return;
854 }
855
856 nci_request(ndev, nci_rf_deactivate_req, NCI_DEACTIVATE_TYPE_IDLE_MODE,
857 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
858 }
859
860 static int nci_activate_target(struct nfc_dev *nfc_dev,
861 struct nfc_target *target, __u32 protocol)
862 {
863 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
864 struct nci_rf_discover_select_param param;
865 struct nfc_target *nci_target = NULL;
866 int i;
867 int rc = 0;
868
869 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
870
871 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
872 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
873 pr_err("there is no available target to activate\n");
874 return -EINVAL;
875 }
876
877 if (ndev->target_active_prot) {
878 pr_err("there is already an active target\n");
879 return -EBUSY;
880 }
881
882 for (i = 0; i < ndev->n_targets; i++) {
883 if (ndev->targets[i].idx == target->idx) {
884 nci_target = &ndev->targets[i];
885 break;
886 }
887 }
888
889 if (!nci_target) {
890 pr_err("unable to find the selected target\n");
891 return -EINVAL;
892 }
893
894 if (!(nci_target->supported_protocols & (1 << protocol))) {
895 pr_err("target does not support the requested protocol 0x%x\n",
896 protocol);
897 return -EINVAL;
898 }
899
900 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
901 param.rf_discovery_id = nci_target->logical_idx;
902
903 if (protocol == NFC_PROTO_JEWEL)
904 param.rf_protocol = NCI_RF_PROTOCOL_T1T;
905 else if (protocol == NFC_PROTO_MIFARE)
906 param.rf_protocol = NCI_RF_PROTOCOL_T2T;
907 else if (protocol == NFC_PROTO_FELICA)
908 param.rf_protocol = NCI_RF_PROTOCOL_T3T;
909 else if (protocol == NFC_PROTO_ISO14443 ||
910 protocol == NFC_PROTO_ISO14443_B)
911 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
912 else
913 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
914
915 rc = nci_request(ndev, nci_rf_discover_select_req,
916 (unsigned long)&param,
917 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
918 }
919
920 if (!rc)
921 ndev->target_active_prot = protocol;
922
923 return rc;
924 }
925
926 static void nci_deactivate_target(struct nfc_dev *nfc_dev,
927 struct nfc_target *target,
928 __u8 mode)
929 {
930 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
931 u8 nci_mode = NCI_DEACTIVATE_TYPE_IDLE_MODE;
932
933 pr_debug("entry\n");
934
935 if (!ndev->target_active_prot) {
936 pr_err("unable to deactivate target, no active target\n");
937 return;
938 }
939
940 ndev->target_active_prot = 0;
941
942 switch (mode) {
943 case NFC_TARGET_MODE_SLEEP:
944 nci_mode = NCI_DEACTIVATE_TYPE_SLEEP_MODE;
945 break;
946 }
947
948 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
949 nci_request(ndev, nci_rf_deactivate_req, nci_mode,
950 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
951 }
952 }
953
954 static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
955 __u8 comm_mode, __u8 *gb, size_t gb_len)
956 {
957 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
958 int rc;
959
960 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
961
962 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
963 if (rc)
964 return rc;
965
966 rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
967 ndev->remote_gb_len);
968 if (!rc)
969 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
970 NFC_RF_INITIATOR);
971
972 return rc;
973 }
974
975 static int nci_dep_link_down(struct nfc_dev *nfc_dev)
976 {
977 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
978 int rc;
979
980 pr_debug("entry\n");
981
982 if (nfc_dev->rf_mode == NFC_RF_INITIATOR) {
983 nci_deactivate_target(nfc_dev, NULL, NCI_DEACTIVATE_TYPE_IDLE_MODE);
984 } else {
985 if (atomic_read(&ndev->state) == NCI_LISTEN_ACTIVE ||
986 atomic_read(&ndev->state) == NCI_DISCOVERY) {
987 nci_request(ndev, nci_rf_deactivate_req, 0,
988 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
989 }
990
991 rc = nfc_tm_deactivated(nfc_dev);
992 if (rc)
993 pr_err("error when signaling tm deactivation\n");
994 }
995
996 return 0;
997 }
998
999
1000 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
1001 struct sk_buff *skb,
1002 data_exchange_cb_t cb, void *cb_context)
1003 {
1004 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1005 int rc;
1006 struct nci_conn_info *conn_info;
1007
1008 conn_info = ndev->rf_conn_info;
1009 if (!conn_info)
1010 return -EPROTO;
1011
1012 pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
1013
1014 if (!ndev->target_active_prot) {
1015 pr_err("unable to exchange data, no active target\n");
1016 return -EINVAL;
1017 }
1018
1019 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1020 return -EBUSY;
1021
1022 /* store cb and context to be used on receiving data */
1023 conn_info->data_exchange_cb = cb;
1024 conn_info->data_exchange_cb_context = cb_context;
1025
1026 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
1027 if (rc)
1028 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
1029
1030 return rc;
1031 }
1032
1033 static int nci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
1034 {
1035 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1036 int rc;
1037
1038 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
1039 if (rc)
1040 pr_err("unable to send data\n");
1041
1042 return rc;
1043 }
1044
1045 static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
1046 {
1047 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1048
1049 if (ndev->ops->enable_se)
1050 return ndev->ops->enable_se(ndev, se_idx);
1051
1052 return 0;
1053 }
1054
1055 static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
1056 {
1057 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1058
1059 if (ndev->ops->disable_se)
1060 return ndev->ops->disable_se(ndev, se_idx);
1061
1062 return 0;
1063 }
1064
1065 static int nci_discover_se(struct nfc_dev *nfc_dev)
1066 {
1067 int r;
1068 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1069
1070 if (ndev->ops->discover_se) {
1071 r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE);
1072 if (r != NCI_STATUS_OK)
1073 return -EPROTO;
1074
1075 return ndev->ops->discover_se(ndev);
1076 }
1077
1078 return 0;
1079 }
1080
1081 static int nci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
1082 u8 *apdu, size_t apdu_length,
1083 se_io_cb_t cb, void *cb_context)
1084 {
1085 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1086
1087 if (ndev->ops->se_io)
1088 return ndev->ops->se_io(ndev, se_idx, apdu,
1089 apdu_length, cb, cb_context);
1090
1091 return 0;
1092 }
1093
1094 static int nci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
1095 {
1096 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
1097
1098 if (!ndev->ops->fw_download)
1099 return -ENOTSUPP;
1100
1101 return ndev->ops->fw_download(ndev, firmware_name);
1102 }
1103
1104 static struct nfc_ops nci_nfc_ops = {
1105 .dev_up = nci_dev_up,
1106 .dev_down = nci_dev_down,
1107 .start_poll = nci_start_poll,
1108 .stop_poll = nci_stop_poll,
1109 .dep_link_up = nci_dep_link_up,
1110 .dep_link_down = nci_dep_link_down,
1111 .activate_target = nci_activate_target,
1112 .deactivate_target = nci_deactivate_target,
1113 .im_transceive = nci_transceive,
1114 .tm_send = nci_tm_send,
1115 .enable_se = nci_enable_se,
1116 .disable_se = nci_disable_se,
1117 .discover_se = nci_discover_se,
1118 .se_io = nci_se_io,
1119 .fw_download = nci_fw_download,
1120 };
1121
1122 /* ---- Interface to NCI drivers ---- */
1123 /**
1124 * nci_allocate_device - allocate a new nci device
1125 *
1126 * @ops: device operations
1127 * @supported_protocols: NFC protocols supported by the device
1128 */
1129 struct nci_dev *nci_allocate_device(struct nci_ops *ops,
1130 __u32 supported_protocols,
1131 int tx_headroom, int tx_tailroom)
1132 {
1133 struct nci_dev *ndev;
1134
1135 pr_debug("supported_protocols 0x%x\n", supported_protocols);
1136
1137 if (!ops->open || !ops->close || !ops->send)
1138 return NULL;
1139
1140 if (!supported_protocols)
1141 return NULL;
1142
1143 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
1144 if (!ndev)
1145 return NULL;
1146
1147 ndev->ops = ops;
1148
1149 if (ops->n_prop_ops > NCI_MAX_PROPRIETARY_CMD) {
1150 pr_err("Too many proprietary commands: %zd\n",
1151 ops->n_prop_ops);
1152 ops->prop_ops = NULL;
1153 ops->n_prop_ops = 0;
1154 }
1155
1156 ndev->tx_headroom = tx_headroom;
1157 ndev->tx_tailroom = tx_tailroom;
1158 init_completion(&ndev->req_completion);
1159
1160 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
1161 supported_protocols,
1162 tx_headroom + NCI_DATA_HDR_SIZE,
1163 tx_tailroom);
1164 if (!ndev->nfc_dev)
1165 goto free_nci;
1166
1167 ndev->hci_dev = nci_hci_allocate(ndev);
1168 if (!ndev->hci_dev)
1169 goto free_nfc;
1170
1171 nfc_set_drvdata(ndev->nfc_dev, ndev);
1172
1173 return ndev;
1174
1175 free_nfc:
1176 kfree(ndev->nfc_dev);
1177
1178 free_nci:
1179 kfree(ndev);
1180 return NULL;
1181 }
1182 EXPORT_SYMBOL(nci_allocate_device);
1183
1184 /**
1185 * nci_free_device - deallocate nci device
1186 *
1187 * @ndev: The nci device to deallocate
1188 */
1189 void nci_free_device(struct nci_dev *ndev)
1190 {
1191 nfc_free_device(ndev->nfc_dev);
1192 kfree(ndev);
1193 }
1194 EXPORT_SYMBOL(nci_free_device);
1195
1196 /**
1197 * nci_register_device - register a nci device in the nfc subsystem
1198 *
1199 * @dev: The nci device to register
1200 */
1201 int nci_register_device(struct nci_dev *ndev)
1202 {
1203 int rc;
1204 struct device *dev = &ndev->nfc_dev->dev;
1205 char name[32];
1206
1207 ndev->flags = 0;
1208
1209 INIT_WORK(&ndev->cmd_work, nci_cmd_work);
1210 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
1211 ndev->cmd_wq = create_singlethread_workqueue(name);
1212 if (!ndev->cmd_wq) {
1213 rc = -ENOMEM;
1214 goto exit;
1215 }
1216
1217 INIT_WORK(&ndev->rx_work, nci_rx_work);
1218 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
1219 ndev->rx_wq = create_singlethread_workqueue(name);
1220 if (!ndev->rx_wq) {
1221 rc = -ENOMEM;
1222 goto destroy_cmd_wq_exit;
1223 }
1224
1225 INIT_WORK(&ndev->tx_work, nci_tx_work);
1226 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
1227 ndev->tx_wq = create_singlethread_workqueue(name);
1228 if (!ndev->tx_wq) {
1229 rc = -ENOMEM;
1230 goto destroy_rx_wq_exit;
1231 }
1232
1233 skb_queue_head_init(&ndev->cmd_q);
1234 skb_queue_head_init(&ndev->rx_q);
1235 skb_queue_head_init(&ndev->tx_q);
1236
1237 setup_timer(&ndev->cmd_timer, nci_cmd_timer,
1238 (unsigned long) ndev);
1239 setup_timer(&ndev->data_timer, nci_data_timer,
1240 (unsigned long) ndev);
1241
1242 mutex_init(&ndev->req_lock);
1243 INIT_LIST_HEAD(&ndev->conn_info_list);
1244
1245 rc = nfc_register_device(ndev->nfc_dev);
1246 if (rc)
1247 goto destroy_rx_wq_exit;
1248
1249 goto exit;
1250
1251 destroy_rx_wq_exit:
1252 destroy_workqueue(ndev->rx_wq);
1253
1254 destroy_cmd_wq_exit:
1255 destroy_workqueue(ndev->cmd_wq);
1256
1257 exit:
1258 return rc;
1259 }
1260 EXPORT_SYMBOL(nci_register_device);
1261
1262 /**
1263 * nci_unregister_device - unregister a nci device in the nfc subsystem
1264 *
1265 * @dev: The nci device to unregister
1266 */
1267 void nci_unregister_device(struct nci_dev *ndev)
1268 {
1269 struct nci_conn_info *conn_info, *n;
1270
1271 nci_close_device(ndev);
1272
1273 destroy_workqueue(ndev->cmd_wq);
1274 destroy_workqueue(ndev->rx_wq);
1275 destroy_workqueue(ndev->tx_wq);
1276
1277 list_for_each_entry_safe(conn_info, n, &ndev->conn_info_list, list) {
1278 list_del(&conn_info->list);
1279 /* conn_info is allocated with devm_kzalloc */
1280 }
1281
1282 nfc_unregister_device(ndev->nfc_dev);
1283 }
1284 EXPORT_SYMBOL(nci_unregister_device);
1285
1286 /**
1287 * nci_recv_frame - receive frame from NCI drivers
1288 *
1289 * @ndev: The nci device
1290 * @skb: The sk_buff to receive
1291 */
1292 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
1293 {
1294 pr_debug("len %d\n", skb->len);
1295
1296 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
1297 !test_bit(NCI_INIT, &ndev->flags))) {
1298 kfree_skb(skb);
1299 return -ENXIO;
1300 }
1301
1302 /* Queue frame for rx worker thread */
1303 skb_queue_tail(&ndev->rx_q, skb);
1304 queue_work(ndev->rx_wq, &ndev->rx_work);
1305
1306 return 0;
1307 }
1308 EXPORT_SYMBOL(nci_recv_frame);
1309
1310 int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
1311 {
1312 pr_debug("len %d\n", skb->len);
1313
1314 if (!ndev) {
1315 kfree_skb(skb);
1316 return -ENODEV;
1317 }
1318
1319 /* Get rid of skb owner, prior to sending to the driver. */
1320 skb_orphan(skb);
1321
1322 /* Send copy to sniffer */
1323 nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1324 RAW_PAYLOAD_NCI, NFC_DIRECTION_TX);
1325
1326 return ndev->ops->send(ndev, skb);
1327 }
1328 EXPORT_SYMBOL(nci_send_frame);
1329
1330 /* Send NCI command */
1331 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
1332 {
1333 struct nci_ctrl_hdr *hdr;
1334 struct sk_buff *skb;
1335
1336 pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
1337
1338 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
1339 if (!skb) {
1340 pr_err("no memory for command\n");
1341 return -ENOMEM;
1342 }
1343
1344 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
1345 hdr->gid = nci_opcode_gid(opcode);
1346 hdr->oid = nci_opcode_oid(opcode);
1347 hdr->plen = plen;
1348
1349 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
1350 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
1351
1352 if (plen)
1353 memcpy(skb_put(skb, plen), payload, plen);
1354
1355 skb_queue_tail(&ndev->cmd_q, skb);
1356 queue_work(ndev->cmd_wq, &ndev->cmd_work);
1357
1358 return 0;
1359 }
1360 EXPORT_SYMBOL(nci_send_cmd);
1361
1362 /* Proprietary commands API */
1363 static struct nci_driver_ops *ops_cmd_lookup(struct nci_driver_ops *ops,
1364 size_t n_ops,
1365 __u16 opcode)
1366 {
1367 size_t i;
1368 struct nci_driver_ops *op;
1369
1370 if (!ops || !n_ops)
1371 return NULL;
1372
1373 for (i = 0; i < n_ops; i++) {
1374 op = &ops[i];
1375 if (op->opcode == opcode)
1376 return op;
1377 }
1378
1379 return NULL;
1380 }
1381
1382 static int nci_op_rsp_packet(struct nci_dev *ndev, __u16 rsp_opcode,
1383 struct sk_buff *skb, struct nci_driver_ops *ops,
1384 size_t n_ops)
1385 {
1386 struct nci_driver_ops *op;
1387
1388 op = ops_cmd_lookup(ops, n_ops, rsp_opcode);
1389 if (!op || !op->rsp)
1390 return -ENOTSUPP;
1391
1392 return op->rsp(ndev, skb);
1393 }
1394
1395 static int nci_op_ntf_packet(struct nci_dev *ndev, __u16 ntf_opcode,
1396 struct sk_buff *skb, struct nci_driver_ops *ops,
1397 size_t n_ops)
1398 {
1399 struct nci_driver_ops *op;
1400
1401 op = ops_cmd_lookup(ops, n_ops, ntf_opcode);
1402 if (!op || !op->ntf)
1403 return -ENOTSUPP;
1404
1405 return op->ntf(ndev, skb);
1406 }
1407
1408 int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1409 struct sk_buff *skb)
1410 {
1411 return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->prop_ops,
1412 ndev->ops->n_prop_ops);
1413 }
1414
1415 int nci_prop_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1416 struct sk_buff *skb)
1417 {
1418 return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->prop_ops,
1419 ndev->ops->n_prop_ops);
1420 }
1421
1422 int nci_core_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1423 struct sk_buff *skb)
1424 {
1425 return nci_op_rsp_packet(ndev, opcode, skb, ndev->ops->core_ops,
1426 ndev->ops->n_core_ops);
1427 }
1428
1429 int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1430 struct sk_buff *skb)
1431 {
1432 return nci_op_ntf_packet(ndev, opcode, skb, ndev->ops->core_ops,
1433 ndev->ops->n_core_ops);
1434 }
1435
1436 /* ---- NCI TX Data worker thread ---- */
1437
1438 static void nci_tx_work(struct work_struct *work)
1439 {
1440 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
1441 struct nci_conn_info *conn_info;
1442 struct sk_buff *skb;
1443
1444 conn_info = nci_get_conn_info_by_conn_id(ndev, ndev->cur_conn_id);
1445 if (!conn_info)
1446 return;
1447
1448 pr_debug("credits_cnt %d\n", atomic_read(&conn_info->credits_cnt));
1449
1450 /* Send queued tx data */
1451 while (atomic_read(&conn_info->credits_cnt)) {
1452 skb = skb_dequeue(&ndev->tx_q);
1453 if (!skb)
1454 return;
1455
1456 /* Check if data flow control is used */
1457 if (atomic_read(&conn_info->credits_cnt) !=
1458 NCI_DATA_FLOW_CONTROL_NOT_USED)
1459 atomic_dec(&conn_info->credits_cnt);
1460
1461 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
1462 nci_pbf(skb->data),
1463 nci_conn_id(skb->data),
1464 nci_plen(skb->data));
1465
1466 nci_send_frame(ndev, skb);
1467
1468 mod_timer(&ndev->data_timer,
1469 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
1470 }
1471 }
1472
1473 /* ----- NCI RX worker thread (data & control) ----- */
1474
1475 static void nci_rx_work(struct work_struct *work)
1476 {
1477 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
1478 struct sk_buff *skb;
1479
1480 while ((skb = skb_dequeue(&ndev->rx_q))) {
1481
1482 /* Send copy to sniffer */
1483 nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1484 RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
1485
1486 /* Process frame */
1487 switch (nci_mt(skb->data)) {
1488 case NCI_MT_RSP_PKT:
1489 nci_rsp_packet(ndev, skb);
1490 break;
1491
1492 case NCI_MT_NTF_PKT:
1493 nci_ntf_packet(ndev, skb);
1494 break;
1495
1496 case NCI_MT_DATA_PKT:
1497 nci_rx_data_packet(ndev, skb);
1498 break;
1499
1500 default:
1501 pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
1502 kfree_skb(skb);
1503 break;
1504 }
1505 }
1506
1507 /* check if a data exchange timout has occurred */
1508 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
1509 /* complete the data exchange transaction, if exists */
1510 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1511 nci_data_exchange_complete(ndev, NULL,
1512 ndev->cur_conn_id,
1513 -ETIMEDOUT);
1514
1515 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
1516 }
1517 }
1518
1519 /* ----- NCI TX CMD worker thread ----- */
1520
1521 static void nci_cmd_work(struct work_struct *work)
1522 {
1523 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
1524 struct sk_buff *skb;
1525
1526 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
1527
1528 /* Send queued command */
1529 if (atomic_read(&ndev->cmd_cnt)) {
1530 skb = skb_dequeue(&ndev->cmd_q);
1531 if (!skb)
1532 return;
1533
1534 atomic_dec(&ndev->cmd_cnt);
1535
1536 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
1537 nci_pbf(skb->data),
1538 nci_opcode_gid(nci_opcode(skb->data)),
1539 nci_opcode_oid(nci_opcode(skb->data)),
1540 nci_plen(skb->data));
1541
1542 nci_send_frame(ndev, skb);
1543
1544 mod_timer(&ndev->cmd_timer,
1545 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
1546 }
1547 }
1548
1549 MODULE_LICENSE("GPL");
Linux with added FPC-III support