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#include <linux/kcov.h>
28
29#include "../nfc.h"
30#include <net/nfc/nci.h>
31#include <net/nfc/nci_core.h>
32#include <linux/nfc.h>
33
34struct core_conn_create_data {
35 int length;
36 struct nci_core_conn_create_cmd *cmd;
37};
38
39static void nci_cmd_work(struct work_struct *work);
40static void nci_rx_work(struct work_struct *work);
41static void nci_tx_work(struct work_struct *work);
42
43struct nci_conn_info *nci_get_conn_info_by_conn_id(struct nci_dev *ndev,
44 int conn_id)
45{
46 struct nci_conn_info *conn_info;
47
48 list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
49 if (conn_info->conn_id == conn_id)
50 return conn_info;
51 }
52
53 return NULL;
54}
55
56int nci_get_conn_info_by_dest_type_params(struct nci_dev *ndev, u8 dest_type,
57 const struct dest_spec_params *params)
58{
59 const struct nci_conn_info *conn_info;
60
61 list_for_each_entry(conn_info, &ndev->conn_info_list, list) {
62 if (conn_info->dest_type == dest_type) {
63 if (!params)
64 return conn_info->conn_id;
65
66 if (params->id == conn_info->dest_params->id &&
67 params->protocol == conn_info->dest_params->protocol)
68 return conn_info->conn_id;
69 }
70 }
71
72 return -EINVAL;
73}
74EXPORT_SYMBOL(nci_get_conn_info_by_dest_type_params);
75
76/* ---- NCI requests ---- */
77
78void nci_req_complete(struct nci_dev *ndev, int result)
79{
80 if (ndev->req_status == NCI_REQ_PEND) {
81 ndev->req_result = result;
82 ndev->req_status = NCI_REQ_DONE;
83 complete(&ndev->req_completion);
84 }
85}
86EXPORT_SYMBOL(nci_req_complete);
87
88static void nci_req_cancel(struct nci_dev *ndev, int err)
89{
90 if (ndev->req_status == NCI_REQ_PEND) {
91 ndev->req_result = err;
92 ndev->req_status = NCI_REQ_CANCELED;
93 complete(&ndev->req_completion);
94 }
95}
96
97/* Execute request and wait for completion. */
98static int __nci_request(struct nci_dev *ndev,
99 void (*req)(struct nci_dev *ndev, const void *opt),
100 const void *opt, __u32 timeout)
101{
102 int rc = 0;
103 long completion_rc;
104
105 ndev->req_status = NCI_REQ_PEND;
106
107 reinit_completion(x: &ndev->req_completion);
108 req(ndev, opt);
109 completion_rc =
110 wait_for_completion_interruptible_timeout(x: &ndev->req_completion,
111 timeout);
112
113 pr_debug("wait_for_completion return %ld\n", completion_rc);
114
115 if (completion_rc > 0) {
116 switch (ndev->req_status) {
117 case NCI_REQ_DONE:
118 rc = nci_to_errno(code: ndev->req_result);
119 break;
120
121 case NCI_REQ_CANCELED:
122 rc = -ndev->req_result;
123 break;
124
125 default:
126 rc = -ETIMEDOUT;
127 break;
128 }
129 } else {
130 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
131 completion_rc);
132
133 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
134 }
135
136 ndev->req_status = ndev->req_result = 0;
137
138 return rc;
139}
140
141inline int nci_request(struct nci_dev *ndev,
142 void (*req)(struct nci_dev *ndev,
143 const void *opt),
144 const void *opt, __u32 timeout)
145{
146 int rc;
147
148 /* Serialize all requests */
149 mutex_lock(&ndev->req_lock);
150 /* check the state after obtaing the lock against any races
151 * from nci_close_device when the device gets removed.
152 */
153 if (test_bit(NCI_UP, &ndev->flags))
154 rc = __nci_request(ndev, req, opt, timeout);
155 else
156 rc = -ENETDOWN;
157 mutex_unlock(lock: &ndev->req_lock);
158
159 return rc;
160}
161
162static void nci_reset_req(struct nci_dev *ndev, const void *opt)
163{
164 struct nci_core_reset_cmd cmd;
165
166 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
167 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, plen: 1, payload: &cmd);
168}
169
170static void nci_init_req(struct nci_dev *ndev, const void *opt)
171{
172 u8 plen = 0;
173
174 if (opt)
175 plen = sizeof(struct nci_core_init_v2_cmd);
176
177 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, plen, payload: opt);
178}
179
180static void nci_init_complete_req(struct nci_dev *ndev, const void *opt)
181{
182 struct nci_rf_disc_map_cmd cmd;
183 struct disc_map_config *cfg = cmd.mapping_configs;
184 __u8 *num = &cmd.num_mapping_configs;
185 int i;
186
187 /* set rf mapping configurations */
188 *num = 0;
189
190 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */
191 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
192 if (ndev->supported_rf_interfaces[i] ==
193 NCI_RF_INTERFACE_ISO_DEP) {
194 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
195 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
196 NCI_DISC_MAP_MODE_LISTEN;
197 cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
198 (*num)++;
199 } else if (ndev->supported_rf_interfaces[i] ==
200 NCI_RF_INTERFACE_NFC_DEP) {
201 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
202 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
203 NCI_DISC_MAP_MODE_LISTEN;
204 cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
205 (*num)++;
206 }
207
208 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
209 break;
210 }
211
212 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
213 plen: (1 + ((*num) * sizeof(struct disc_map_config))), payload: &cmd);
214}
215
216struct nci_set_config_param {
217 __u8 id;
218 size_t len;
219 const __u8 *val;
220};
221
222static void nci_set_config_req(struct nci_dev *ndev, const void *opt)
223{
224 const struct nci_set_config_param *param = opt;
225 struct nci_core_set_config_cmd cmd;
226
227 BUG_ON(param->len > NCI_MAX_PARAM_LEN);
228
229 cmd.num_params = 1;
230 cmd.param.id = param->id;
231 cmd.param.len = param->len;
232 memcpy(cmd.param.val, param->val, param->len);
233
234 nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, plen: (3 + param->len), payload: &cmd);
235}
236
237struct nci_rf_discover_param {
238 __u32 im_protocols;
239 __u32 tm_protocols;
240};
241
242static void nci_rf_discover_req(struct nci_dev *ndev, const void *opt)
243{
244 const struct nci_rf_discover_param *param = opt;
245 struct nci_rf_disc_cmd cmd;
246
247 cmd.num_disc_configs = 0;
248
249 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
250 (param->im_protocols & NFC_PROTO_JEWEL_MASK ||
251 param->im_protocols & NFC_PROTO_MIFARE_MASK ||
252 param->im_protocols & NFC_PROTO_ISO14443_MASK ||
253 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
254 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
255 NCI_NFC_A_PASSIVE_POLL_MODE;
256 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
257 cmd.num_disc_configs++;
258 }
259
260 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
261 (param->im_protocols & NFC_PROTO_ISO14443_B_MASK)) {
262 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
263 NCI_NFC_B_PASSIVE_POLL_MODE;
264 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
265 cmd.num_disc_configs++;
266 }
267
268 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
269 (param->im_protocols & NFC_PROTO_FELICA_MASK ||
270 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
271 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
272 NCI_NFC_F_PASSIVE_POLL_MODE;
273 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
274 cmd.num_disc_configs++;
275 }
276
277 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
278 (param->im_protocols & NFC_PROTO_ISO15693_MASK)) {
279 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
280 NCI_NFC_V_PASSIVE_POLL_MODE;
281 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
282 cmd.num_disc_configs++;
283 }
284
285 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS - 1) &&
286 (param->tm_protocols & NFC_PROTO_NFC_DEP_MASK)) {
287 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
288 NCI_NFC_A_PASSIVE_LISTEN_MODE;
289 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
290 cmd.num_disc_configs++;
291 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
292 NCI_NFC_F_PASSIVE_LISTEN_MODE;
293 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
294 cmd.num_disc_configs++;
295 }
296
297 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
298 plen: (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
299 payload: &cmd);
300}
301
302struct nci_rf_discover_select_param {
303 __u8 rf_discovery_id;
304 __u8 rf_protocol;
305};
306
307static void nci_rf_discover_select_req(struct nci_dev *ndev, const void *opt)
308{
309 const struct nci_rf_discover_select_param *param = opt;
310 struct nci_rf_discover_select_cmd cmd;
311
312 cmd.rf_discovery_id = param->rf_discovery_id;
313 cmd.rf_protocol = param->rf_protocol;
314
315 switch (cmd.rf_protocol) {
316 case NCI_RF_PROTOCOL_ISO_DEP:
317 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
318 break;
319
320 case NCI_RF_PROTOCOL_NFC_DEP:
321 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
322 break;
323
324 default:
325 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
326 break;
327 }
328
329 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
330 plen: sizeof(struct nci_rf_discover_select_cmd), payload: &cmd);
331}
332
333static void nci_rf_deactivate_req(struct nci_dev *ndev, const void *opt)
334{
335 struct nci_rf_deactivate_cmd cmd;
336
337 cmd.type = (unsigned long)opt;
338
339 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
340 plen: sizeof(struct nci_rf_deactivate_cmd), payload: &cmd);
341}
342
343struct nci_cmd_param {
344 __u16 opcode;
345 size_t len;
346 const __u8 *payload;
347};
348
349static void nci_generic_req(struct nci_dev *ndev, const void *opt)
350{
351 const struct nci_cmd_param *param = opt;
352
353 nci_send_cmd(ndev, opcode: param->opcode, plen: param->len, payload: param->payload);
354}
355
356int nci_prop_cmd(struct nci_dev *ndev, __u8 oid, size_t len, const __u8 *payload)
357{
358 struct nci_cmd_param param;
359
360 param.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY, oid);
361 param.len = len;
362 param.payload = payload;
363
364 return __nci_request(ndev, req: nci_generic_req, opt: &param,
365 timeout: msecs_to_jiffies(NCI_CMD_TIMEOUT));
366}
367EXPORT_SYMBOL(nci_prop_cmd);
368
369int nci_core_cmd(struct nci_dev *ndev, __u16 opcode, size_t len,
370 const __u8 *payload)
371{
372 struct nci_cmd_param param;
373
374 param.opcode = opcode;
375 param.len = len;
376 param.payload = payload;
377
378 return __nci_request(ndev, req: nci_generic_req, opt: &param,
379 timeout: msecs_to_jiffies(NCI_CMD_TIMEOUT));
380}
381EXPORT_SYMBOL(nci_core_cmd);
382
383int nci_core_reset(struct nci_dev *ndev)
384{
385 return __nci_request(ndev, req: nci_reset_req, opt: (void *)0,
386 timeout: msecs_to_jiffies(NCI_RESET_TIMEOUT));
387}
388EXPORT_SYMBOL(nci_core_reset);
389
390int nci_core_init(struct nci_dev *ndev)
391{
392 return __nci_request(ndev, req: nci_init_req, opt: (void *)0,
393 timeout: msecs_to_jiffies(NCI_INIT_TIMEOUT));
394}
395EXPORT_SYMBOL(nci_core_init);
396
397struct nci_loopback_data {
398 u8 conn_id;
399 struct sk_buff *data;
400};
401
402static void nci_send_data_req(struct nci_dev *ndev, const void *opt)
403{
404 const struct nci_loopback_data *data = opt;
405
406 nci_send_data(ndev, conn_id: data->conn_id, skb: data->data);
407}
408
409static void nci_nfcc_loopback_cb(void *context, struct sk_buff *skb, int err)
410{
411 struct nci_dev *ndev = (struct nci_dev *)context;
412 struct nci_conn_info *conn_info;
413
414 conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id: ndev->cur_conn_id);
415 if (!conn_info) {
416 nci_req_complete(ndev, NCI_STATUS_REJECTED);
417 return;
418 }
419
420 conn_info->rx_skb = skb;
421
422 nci_req_complete(ndev, NCI_STATUS_OK);
423}
424
425int nci_nfcc_loopback(struct nci_dev *ndev, const void *data, size_t data_len,
426 struct sk_buff **resp)
427{
428 int r;
429 struct nci_loopback_data loopback_data;
430 struct nci_conn_info *conn_info;
431 struct sk_buff *skb;
432 int conn_id = nci_get_conn_info_by_dest_type_params(ndev,
433 NCI_DESTINATION_NFCC_LOOPBACK, NULL);
434
435 if (conn_id < 0) {
436 r = nci_core_conn_create(ndev, NCI_DESTINATION_NFCC_LOOPBACK,
437 number_destination_params: 0, params_len: 0, NULL);
438 if (r != NCI_STATUS_OK)
439 return r;
440
441 conn_id = nci_get_conn_info_by_dest_type_params(ndev,
442 NCI_DESTINATION_NFCC_LOOPBACK,
443 NULL);
444 }
445
446 conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id);
447 if (!conn_info)
448 return -EPROTO;
449
450 /* store cb and context to be used on receiving data */
451 conn_info->data_exchange_cb = nci_nfcc_loopback_cb;
452 conn_info->data_exchange_cb_context = ndev;
453
454 skb = nci_skb_alloc(ndev, NCI_DATA_HDR_SIZE + data_len, GFP_KERNEL);
455 if (!skb)
456 return -ENOMEM;
457
458 skb_reserve(skb, NCI_DATA_HDR_SIZE);
459 skb_put_data(skb, data, len: data_len);
460
461 loopback_data.conn_id = conn_id;
462 loopback_data.data = skb;
463
464 ndev->cur_conn_id = conn_id;
465 r = nci_request(ndev, req: nci_send_data_req, opt: &loopback_data,
466 timeout: msecs_to_jiffies(NCI_DATA_TIMEOUT));
467 if (r == NCI_STATUS_OK && resp)
468 *resp = conn_info->rx_skb;
469
470 return r;
471}
472EXPORT_SYMBOL(nci_nfcc_loopback);
473
474static int nci_open_device(struct nci_dev *ndev)
475{
476 int rc = 0;
477
478 mutex_lock(&ndev->req_lock);
479
480 if (test_bit(NCI_UNREG, &ndev->flags)) {
481 rc = -ENODEV;
482 goto done;
483 }
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(v: &ndev->cmd_cnt, i: 1);
496
497 set_bit(nr: NCI_INIT, addr: &ndev->flags);
498
499 if (ndev->ops->init)
500 rc = ndev->ops->init(ndev);
501
502 if (!rc) {
503 rc = __nci_request(ndev, req: nci_reset_req, opt: (void *)0,
504 timeout: 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 struct nci_core_init_v2_cmd nci_init_v2_cmd = {
513 .feature1 = NCI_FEATURE_DISABLE,
514 .feature2 = NCI_FEATURE_DISABLE
515 };
516 const void *opt = NULL;
517
518 if (ndev->nci_ver & NCI_VER_2_MASK)
519 opt = &nci_init_v2_cmd;
520
521 rc = __nci_request(ndev, req: nci_init_req, opt,
522 timeout: msecs_to_jiffies(NCI_INIT_TIMEOUT));
523 }
524
525 if (!rc && ndev->ops->post_setup)
526 rc = ndev->ops->post_setup(ndev);
527
528 if (!rc) {
529 rc = __nci_request(ndev, req: nci_init_complete_req, opt: (void *)0,
530 timeout: msecs_to_jiffies(NCI_INIT_TIMEOUT));
531 }
532
533 clear_bit(nr: NCI_INIT, addr: &ndev->flags);
534
535 if (!rc) {
536 set_bit(nr: NCI_UP, addr: &ndev->flags);
537 nci_clear_target_list(ndev);
538 atomic_set(v: &ndev->state, i: NCI_IDLE);
539 } else {
540 /* Init failed, cleanup */
541 skb_queue_purge(list: &ndev->cmd_q);
542 skb_queue_purge(list: &ndev->rx_q);
543 skb_queue_purge(list: &ndev->tx_q);
544
545 ndev->ops->close(ndev);
546 ndev->flags &= BIT(NCI_UNREG);
547 }
548
549done:
550 mutex_unlock(lock: &ndev->req_lock);
551 return rc;
552}
553
554static int nci_close_device(struct nci_dev *ndev)
555{
556 nci_req_cancel(ndev, ENODEV);
557
558 /* This mutex needs to be held as a barrier for
559 * caller nci_unregister_device
560 */
561 mutex_lock(&ndev->req_lock);
562
563 if (!test_and_clear_bit(nr: NCI_UP, addr: &ndev->flags)) {
564 /* Need to flush the cmd wq in case
565 * there is a queued/running cmd_work
566 */
567 flush_workqueue(ndev->cmd_wq);
568 del_timer_sync(timer: &ndev->cmd_timer);
569 del_timer_sync(timer: &ndev->data_timer);
570 mutex_unlock(lock: &ndev->req_lock);
571 return 0;
572 }
573
574 /* Drop RX and TX queues */
575 skb_queue_purge(list: &ndev->rx_q);
576 skb_queue_purge(list: &ndev->tx_q);
577
578 /* Flush RX and TX wq */
579 flush_workqueue(ndev->rx_wq);
580 flush_workqueue(ndev->tx_wq);
581
582 /* Reset device */
583 skb_queue_purge(list: &ndev->cmd_q);
584 atomic_set(v: &ndev->cmd_cnt, i: 1);
585
586 set_bit(nr: NCI_INIT, addr: &ndev->flags);
587 __nci_request(ndev, req: nci_reset_req, opt: (void *)0,
588 timeout: msecs_to_jiffies(NCI_RESET_TIMEOUT));
589
590 /* After this point our queues are empty
591 * and no works are scheduled.
592 */
593 ndev->ops->close(ndev);
594
595 clear_bit(nr: NCI_INIT, addr: &ndev->flags);
596
597 /* Flush cmd wq */
598 flush_workqueue(ndev->cmd_wq);
599
600 del_timer_sync(timer: &ndev->cmd_timer);
601
602 /* Clear flags except NCI_UNREG */
603 ndev->flags &= BIT(NCI_UNREG);
604
605 mutex_unlock(lock: &ndev->req_lock);
606
607 return 0;
608}
609
610/* NCI command timer function */
611static void nci_cmd_timer(struct timer_list *t)
612{
613 struct nci_dev *ndev = from_timer(ndev, t, cmd_timer);
614
615 atomic_set(v: &ndev->cmd_cnt, i: 1);
616 queue_work(wq: ndev->cmd_wq, work: &ndev->cmd_work);
617}
618
619/* NCI data exchange timer function */
620static void nci_data_timer(struct timer_list *t)
621{
622 struct nci_dev *ndev = from_timer(ndev, t, data_timer);
623
624 set_bit(nr: NCI_DATA_EXCHANGE_TO, addr: &ndev->flags);
625 queue_work(wq: ndev->rx_wq, work: &ndev->rx_work);
626}
627
628static int nci_dev_up(struct nfc_dev *nfc_dev)
629{
630 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
631
632 return nci_open_device(ndev);
633}
634
635static int nci_dev_down(struct nfc_dev *nfc_dev)
636{
637 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
638
639 return nci_close_device(ndev);
640}
641
642int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, const __u8 *val)
643{
644 struct nci_set_config_param param;
645
646 if (!val || !len)
647 return 0;
648
649 param.id = id;
650 param.len = len;
651 param.val = val;
652
653 return __nci_request(ndev, req: nci_set_config_req, opt: &param,
654 timeout: msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
655}
656EXPORT_SYMBOL(nci_set_config);
657
658static void nci_nfcee_discover_req(struct nci_dev *ndev, const void *opt)
659{
660 struct nci_nfcee_discover_cmd cmd;
661 __u8 action = (unsigned long)opt;
662
663 cmd.discovery_action = action;
664
665 nci_send_cmd(ndev, NCI_OP_NFCEE_DISCOVER_CMD, plen: 1, payload: &cmd);
666}
667
668int nci_nfcee_discover(struct nci_dev *ndev, u8 action)
669{
670 unsigned long opt = action;
671
672 return __nci_request(ndev, req: nci_nfcee_discover_req, opt: (void *)opt,
673 timeout: msecs_to_jiffies(NCI_CMD_TIMEOUT));
674}
675EXPORT_SYMBOL(nci_nfcee_discover);
676
677static void nci_nfcee_mode_set_req(struct nci_dev *ndev, const void *opt)
678{
679 const struct nci_nfcee_mode_set_cmd *cmd = opt;
680
681 nci_send_cmd(ndev, NCI_OP_NFCEE_MODE_SET_CMD,
682 plen: sizeof(struct nci_nfcee_mode_set_cmd), payload: cmd);
683}
684
685int nci_nfcee_mode_set(struct nci_dev *ndev, u8 nfcee_id, u8 nfcee_mode)
686{
687 struct nci_nfcee_mode_set_cmd cmd;
688
689 cmd.nfcee_id = nfcee_id;
690 cmd.nfcee_mode = nfcee_mode;
691
692 return __nci_request(ndev, req: nci_nfcee_mode_set_req, opt: &cmd,
693 timeout: msecs_to_jiffies(NCI_CMD_TIMEOUT));
694}
695EXPORT_SYMBOL(nci_nfcee_mode_set);
696
697static void nci_core_conn_create_req(struct nci_dev *ndev, const void *opt)
698{
699 const struct core_conn_create_data *data = opt;
700
701 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CREATE_CMD, plen: data->length, payload: data->cmd);
702}
703
704int nci_core_conn_create(struct nci_dev *ndev, u8 destination_type,
705 u8 number_destination_params,
706 size_t params_len,
707 const struct core_conn_create_dest_spec_params *params)
708{
709 int r;
710 struct nci_core_conn_create_cmd *cmd;
711 struct core_conn_create_data data;
712
713 data.length = params_len + sizeof(struct nci_core_conn_create_cmd);
714 cmd = kzalloc(size: data.length, GFP_KERNEL);
715 if (!cmd)
716 return -ENOMEM;
717
718 cmd->destination_type = destination_type;
719 cmd->number_destination_params = number_destination_params;
720
721 data.cmd = cmd;
722
723 if (params) {
724 memcpy(cmd->params, params, params_len);
725 if (params->length > 0)
726 memcpy(&ndev->cur_params,
727 &params->value[DEST_SPEC_PARAMS_ID_INDEX],
728 sizeof(struct dest_spec_params));
729 else
730 ndev->cur_params.id = 0;
731 } else {
732 ndev->cur_params.id = 0;
733 }
734 ndev->cur_dest_type = destination_type;
735
736 r = __nci_request(ndev, req: nci_core_conn_create_req, opt: &data,
737 timeout: msecs_to_jiffies(NCI_CMD_TIMEOUT));
738 kfree(objp: cmd);
739 return r;
740}
741EXPORT_SYMBOL(nci_core_conn_create);
742
743static void nci_core_conn_close_req(struct nci_dev *ndev, const void *opt)
744{
745 __u8 conn_id = (unsigned long)opt;
746
747 nci_send_cmd(ndev, NCI_OP_CORE_CONN_CLOSE_CMD, plen: 1, payload: &conn_id);
748}
749
750int nci_core_conn_close(struct nci_dev *ndev, u8 conn_id)
751{
752 unsigned long opt = conn_id;
753
754 ndev->cur_conn_id = conn_id;
755 return __nci_request(ndev, req: nci_core_conn_close_req, opt: (void *)opt,
756 timeout: msecs_to_jiffies(NCI_CMD_TIMEOUT));
757}
758EXPORT_SYMBOL(nci_core_conn_close);
759
760static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
761{
762 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
763 struct nci_set_config_param param;
764 int rc;
765
766 param.val = nfc_get_local_general_bytes(dev: nfc_dev, gb_len: &param.len);
767 if ((param.val == NULL) || (param.len == 0))
768 return 0;
769
770 if (param.len > NFC_MAX_GT_LEN)
771 return -EINVAL;
772
773 param.id = NCI_PN_ATR_REQ_GEN_BYTES;
774
775 rc = nci_request(ndev, req: nci_set_config_req, opt: &param,
776 timeout: msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
777 if (rc)
778 return rc;
779
780 param.id = NCI_LN_ATR_RES_GEN_BYTES;
781
782 return nci_request(ndev, req: nci_set_config_req, opt: &param,
783 timeout: msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
784}
785
786static int nci_set_listen_parameters(struct nfc_dev *nfc_dev)
787{
788 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
789 int rc;
790 __u8 val;
791
792 val = NCI_LA_SEL_INFO_NFC_DEP_MASK;
793
794 rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val);
795 if (rc)
796 return rc;
797
798 val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK;
799
800 rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val);
801 if (rc)
802 return rc;
803
804 val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424;
805
806 return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val);
807}
808
809static int nci_start_poll(struct nfc_dev *nfc_dev,
810 __u32 im_protocols, __u32 tm_protocols)
811{
812 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
813 struct nci_rf_discover_param param;
814 int rc;
815
816 if ((atomic_read(v: &ndev->state) == NCI_DISCOVERY) ||
817 (atomic_read(v: &ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
818 pr_err("unable to start poll, since poll is already active\n");
819 return -EBUSY;
820 }
821
822 if (ndev->target_active_prot) {
823 pr_err("there is an active target\n");
824 return -EBUSY;
825 }
826
827 if ((atomic_read(v: &ndev->state) == NCI_W4_HOST_SELECT) ||
828 (atomic_read(v: &ndev->state) == NCI_POLL_ACTIVE)) {
829 pr_debug("target active or w4 select, implicitly deactivate\n");
830
831 rc = nci_request(ndev, req: nci_rf_deactivate_req,
832 opt: (void *)NCI_DEACTIVATE_TYPE_IDLE_MODE,
833 timeout: msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
834 if (rc)
835 return -EBUSY;
836 }
837
838 if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
839 rc = nci_set_local_general_bytes(nfc_dev);
840 if (rc) {
841 pr_err("failed to set local general bytes\n");
842 return rc;
843 }
844 }
845
846 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
847 rc = nci_set_listen_parameters(nfc_dev);
848 if (rc)
849 pr_err("failed to set listen parameters\n");
850 }
851
852 param.im_protocols = im_protocols;
853 param.tm_protocols = tm_protocols;
854 rc = nci_request(ndev, req: nci_rf_discover_req, opt: &param,
855 timeout: msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
856
857 if (!rc)
858 ndev->poll_prots = im_protocols;
859
860 return rc;
861}
862
863static void nci_stop_poll(struct nfc_dev *nfc_dev)
864{
865 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
866
867 if ((atomic_read(v: &ndev->state) != NCI_DISCOVERY) &&
868 (atomic_read(v: &ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
869 pr_err("unable to stop poll, since poll is not active\n");
870 return;
871 }
872
873 nci_request(ndev, req: nci_rf_deactivate_req,
874 opt: (void *)NCI_DEACTIVATE_TYPE_IDLE_MODE,
875 timeout: msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
876}
877
878static int nci_activate_target(struct nfc_dev *nfc_dev,
879 struct nfc_target *target, __u32 protocol)
880{
881 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
882 struct nci_rf_discover_select_param param;
883 const struct nfc_target *nci_target = NULL;
884 int i;
885 int rc = 0;
886
887 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
888
889 if ((atomic_read(v: &ndev->state) != NCI_W4_HOST_SELECT) &&
890 (atomic_read(v: &ndev->state) != NCI_POLL_ACTIVE)) {
891 pr_err("there is no available target to activate\n");
892 return -EINVAL;
893 }
894
895 if (ndev->target_active_prot) {
896 pr_err("there is already an active target\n");
897 return -EBUSY;
898 }
899
900 for (i = 0; i < ndev->n_targets; i++) {
901 if (ndev->targets[i].idx == target->idx) {
902 nci_target = &ndev->targets[i];
903 break;
904 }
905 }
906
907 if (!nci_target) {
908 pr_err("unable to find the selected target\n");
909 return -EINVAL;
910 }
911
912 if (protocol >= NFC_PROTO_MAX) {
913 pr_err("the requested nfc protocol is invalid\n");
914 return -EINVAL;
915 }
916
917 if (!(nci_target->supported_protocols & (1 << protocol))) {
918 pr_err("target does not support the requested protocol 0x%x\n",
919 protocol);
920 return -EINVAL;
921 }
922
923 if (atomic_read(v: &ndev->state) == NCI_W4_HOST_SELECT) {
924 param.rf_discovery_id = nci_target->logical_idx;
925
926 if (protocol == NFC_PROTO_JEWEL)
927 param.rf_protocol = NCI_RF_PROTOCOL_T1T;
928 else if (protocol == NFC_PROTO_MIFARE)
929 param.rf_protocol = NCI_RF_PROTOCOL_T2T;
930 else if (protocol == NFC_PROTO_FELICA)
931 param.rf_protocol = NCI_RF_PROTOCOL_T3T;
932 else if (protocol == NFC_PROTO_ISO14443 ||
933 protocol == NFC_PROTO_ISO14443_B)
934 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
935 else
936 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
937
938 rc = nci_request(ndev, req: nci_rf_discover_select_req, opt: &param,
939 timeout: msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
940 }
941
942 if (!rc)
943 ndev->target_active_prot = protocol;
944
945 return rc;
946}
947
948static void nci_deactivate_target(struct nfc_dev *nfc_dev,
949 struct nfc_target *target,
950 __u8 mode)
951{
952 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
953 unsigned long nci_mode = NCI_DEACTIVATE_TYPE_IDLE_MODE;
954
955 if (!ndev->target_active_prot) {
956 pr_err("unable to deactivate target, no active target\n");
957 return;
958 }
959
960 ndev->target_active_prot = 0;
961
962 switch (mode) {
963 case NFC_TARGET_MODE_SLEEP:
964 nci_mode = NCI_DEACTIVATE_TYPE_SLEEP_MODE;
965 break;
966 }
967
968 if (atomic_read(v: &ndev->state) == NCI_POLL_ACTIVE) {
969 nci_request(ndev, req: nci_rf_deactivate_req, opt: (void *)nci_mode,
970 timeout: msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
971 }
972}
973
974static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
975 __u8 comm_mode, __u8 *gb, size_t gb_len)
976{
977 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
978 int rc;
979
980 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
981
982 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
983 if (rc)
984 return rc;
985
986 rc = nfc_set_remote_general_bytes(dev: nfc_dev, gt: ndev->remote_gb,
987 gt_len: ndev->remote_gb_len);
988 if (!rc)
989 rc = nfc_dep_link_is_up(dev: nfc_dev, target_idx: target->idx, NFC_COMM_PASSIVE,
990 NFC_RF_INITIATOR);
991
992 return rc;
993}
994
995static int nci_dep_link_down(struct nfc_dev *nfc_dev)
996{
997 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
998 int rc;
999
1000 if (nfc_dev->rf_mode == NFC_RF_INITIATOR) {
1001 nci_deactivate_target(nfc_dev, NULL, NCI_DEACTIVATE_TYPE_IDLE_MODE);
1002 } else {
1003 if (atomic_read(v: &ndev->state) == NCI_LISTEN_ACTIVE ||
1004 atomic_read(v: &ndev->state) == NCI_DISCOVERY) {
1005 nci_request(ndev, req: nci_rf_deactivate_req, opt: (void *)0,
1006 timeout: msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
1007 }
1008
1009 rc = nfc_tm_deactivated(dev: nfc_dev);
1010 if (rc)
1011 pr_err("error when signaling tm deactivation\n");
1012 }
1013
1014 return 0;
1015}
1016
1017
1018static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
1019 struct sk_buff *skb,
1020 data_exchange_cb_t cb, void *cb_context)
1021{
1022 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
1023 int rc;
1024 struct nci_conn_info *conn_info;
1025
1026 conn_info = ndev->rf_conn_info;
1027 if (!conn_info)
1028 return -EPROTO;
1029
1030 pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
1031
1032 if (!ndev->target_active_prot) {
1033 pr_err("unable to exchange data, no active target\n");
1034 return -EINVAL;
1035 }
1036
1037 if (test_and_set_bit(nr: NCI_DATA_EXCHANGE, addr: &ndev->flags))
1038 return -EBUSY;
1039
1040 /* store cb and context to be used on receiving data */
1041 conn_info->data_exchange_cb = cb;
1042 conn_info->data_exchange_cb_context = cb_context;
1043
1044 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
1045 if (rc)
1046 clear_bit(nr: NCI_DATA_EXCHANGE, addr: &ndev->flags);
1047
1048 return rc;
1049}
1050
1051static int nci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
1052{
1053 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
1054 int rc;
1055
1056 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
1057 if (rc)
1058 pr_err("unable to send data\n");
1059
1060 return rc;
1061}
1062
1063static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
1064{
1065 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
1066
1067 if (ndev->ops->enable_se)
1068 return ndev->ops->enable_se(ndev, se_idx);
1069
1070 return 0;
1071}
1072
1073static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
1074{
1075 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
1076
1077 if (ndev->ops->disable_se)
1078 return ndev->ops->disable_se(ndev, se_idx);
1079
1080 return 0;
1081}
1082
1083static int nci_discover_se(struct nfc_dev *nfc_dev)
1084{
1085 int r;
1086 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
1087
1088 if (ndev->ops->discover_se) {
1089 r = nci_nfcee_discover(ndev, NCI_NFCEE_DISCOVERY_ACTION_ENABLE);
1090 if (r != NCI_STATUS_OK)
1091 return -EPROTO;
1092
1093 return ndev->ops->discover_se(ndev);
1094 }
1095
1096 return 0;
1097}
1098
1099static int nci_se_io(struct nfc_dev *nfc_dev, u32 se_idx,
1100 u8 *apdu, size_t apdu_length,
1101 se_io_cb_t cb, void *cb_context)
1102{
1103 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
1104
1105 if (ndev->ops->se_io)
1106 return ndev->ops->se_io(ndev, se_idx, apdu,
1107 apdu_length, cb, cb_context);
1108
1109 return 0;
1110}
1111
1112static int nci_fw_download(struct nfc_dev *nfc_dev, const char *firmware_name)
1113{
1114 struct nci_dev *ndev = nfc_get_drvdata(dev: nfc_dev);
1115
1116 if (!ndev->ops->fw_download)
1117 return -ENOTSUPP;
1118
1119 return ndev->ops->fw_download(ndev, firmware_name);
1120}
1121
1122static const struct nfc_ops nci_nfc_ops = {
1123 .dev_up = nci_dev_up,
1124 .dev_down = nci_dev_down,
1125 .start_poll = nci_start_poll,
1126 .stop_poll = nci_stop_poll,
1127 .dep_link_up = nci_dep_link_up,
1128 .dep_link_down = nci_dep_link_down,
1129 .activate_target = nci_activate_target,
1130 .deactivate_target = nci_deactivate_target,
1131 .im_transceive = nci_transceive,
1132 .tm_send = nci_tm_send,
1133 .enable_se = nci_enable_se,
1134 .disable_se = nci_disable_se,
1135 .discover_se = nci_discover_se,
1136 .se_io = nci_se_io,
1137 .fw_download = nci_fw_download,
1138};
1139
1140/* ---- Interface to NCI drivers ---- */
1141/**
1142 * nci_allocate_device - allocate a new nci device
1143 *
1144 * @ops: device operations
1145 * @supported_protocols: NFC protocols supported by the device
1146 * @tx_headroom: Reserved space at beginning of skb
1147 * @tx_tailroom: Reserved space at end of skb
1148 */
1149struct nci_dev *nci_allocate_device(const struct nci_ops *ops,
1150 __u32 supported_protocols,
1151 int tx_headroom, int tx_tailroom)
1152{
1153 struct nci_dev *ndev;
1154
1155 pr_debug("supported_protocols 0x%x\n", supported_protocols);
1156
1157 if (!ops->open || !ops->close || !ops->send)
1158 return NULL;
1159
1160 if (!supported_protocols)
1161 return NULL;
1162
1163 ndev = kzalloc(size: sizeof(struct nci_dev), GFP_KERNEL);
1164 if (!ndev)
1165 return NULL;
1166
1167 ndev->ops = ops;
1168
1169 if (ops->n_prop_ops > NCI_MAX_PROPRIETARY_CMD) {
1170 pr_err("Too many proprietary commands: %zd\n",
1171 ops->n_prop_ops);
1172 goto free_nci;
1173 }
1174
1175 ndev->tx_headroom = tx_headroom;
1176 ndev->tx_tailroom = tx_tailroom;
1177 init_completion(x: &ndev->req_completion);
1178
1179 ndev->nfc_dev = nfc_allocate_device(ops: &nci_nfc_ops,
1180 supported_protocols,
1181 tx_headroom: tx_headroom + NCI_DATA_HDR_SIZE,
1182 tx_tailroom);
1183 if (!ndev->nfc_dev)
1184 goto free_nci;
1185
1186 ndev->hci_dev = nci_hci_allocate(ndev);
1187 if (!ndev->hci_dev)
1188 goto free_nfc;
1189
1190 nfc_set_drvdata(dev: ndev->nfc_dev, data: ndev);
1191
1192 return ndev;
1193
1194free_nfc:
1195 nfc_free_device(dev: ndev->nfc_dev);
1196free_nci:
1197 kfree(objp: ndev);
1198 return NULL;
1199}
1200EXPORT_SYMBOL(nci_allocate_device);
1201
1202/**
1203 * nci_free_device - deallocate nci device
1204 *
1205 * @ndev: The nci device to deallocate
1206 */
1207void nci_free_device(struct nci_dev *ndev)
1208{
1209 nfc_free_device(dev: ndev->nfc_dev);
1210 nci_hci_deallocate(ndev);
1211 kfree(objp: ndev);
1212}
1213EXPORT_SYMBOL(nci_free_device);
1214
1215/**
1216 * nci_register_device - register a nci device in the nfc subsystem
1217 *
1218 * @ndev: The nci device to register
1219 */
1220int nci_register_device(struct nci_dev *ndev)
1221{
1222 int rc;
1223 struct device *dev = &ndev->nfc_dev->dev;
1224 char name[32];
1225
1226 ndev->flags = 0;
1227
1228 INIT_WORK(&ndev->cmd_work, nci_cmd_work);
1229 snprintf(buf: name, size: sizeof(name), fmt: "%s_nci_cmd_wq", dev_name(dev));
1230 ndev->cmd_wq = create_singlethread_workqueue(name);
1231 if (!ndev->cmd_wq) {
1232 rc = -ENOMEM;
1233 goto exit;
1234 }
1235
1236 INIT_WORK(&ndev->rx_work, nci_rx_work);
1237 snprintf(buf: name, size: sizeof(name), fmt: "%s_nci_rx_wq", dev_name(dev));
1238 ndev->rx_wq = create_singlethread_workqueue(name);
1239 if (!ndev->rx_wq) {
1240 rc = -ENOMEM;
1241 goto destroy_cmd_wq_exit;
1242 }
1243
1244 INIT_WORK(&ndev->tx_work, nci_tx_work);
1245 snprintf(buf: name, size: sizeof(name), fmt: "%s_nci_tx_wq", dev_name(dev));
1246 ndev->tx_wq = create_singlethread_workqueue(name);
1247 if (!ndev->tx_wq) {
1248 rc = -ENOMEM;
1249 goto destroy_rx_wq_exit;
1250 }
1251
1252 skb_queue_head_init(list: &ndev->cmd_q);
1253 skb_queue_head_init(list: &ndev->rx_q);
1254 skb_queue_head_init(list: &ndev->tx_q);
1255
1256 timer_setup(&ndev->cmd_timer, nci_cmd_timer, 0);
1257 timer_setup(&ndev->data_timer, nci_data_timer, 0);
1258
1259 mutex_init(&ndev->req_lock);
1260 INIT_LIST_HEAD(list: &ndev->conn_info_list);
1261
1262 rc = nfc_register_device(dev: ndev->nfc_dev);
1263 if (rc)
1264 goto destroy_tx_wq_exit;
1265
1266 goto exit;
1267
1268destroy_tx_wq_exit:
1269 destroy_workqueue(wq: ndev->tx_wq);
1270
1271destroy_rx_wq_exit:
1272 destroy_workqueue(wq: ndev->rx_wq);
1273
1274destroy_cmd_wq_exit:
1275 destroy_workqueue(wq: ndev->cmd_wq);
1276
1277exit:
1278 return rc;
1279}
1280EXPORT_SYMBOL(nci_register_device);
1281
1282/**
1283 * nci_unregister_device - unregister a nci device in the nfc subsystem
1284 *
1285 * @ndev: The nci device to unregister
1286 */
1287void nci_unregister_device(struct nci_dev *ndev)
1288{
1289 struct nci_conn_info *conn_info, *n;
1290
1291 /* This set_bit is not protected with specialized barrier,
1292 * However, it is fine because the mutex_lock(&ndev->req_lock);
1293 * in nci_close_device() will help to emit one.
1294 */
1295 set_bit(nr: NCI_UNREG, addr: &ndev->flags);
1296
1297 nci_close_device(ndev);
1298
1299 destroy_workqueue(wq: ndev->cmd_wq);
1300 destroy_workqueue(wq: ndev->rx_wq);
1301 destroy_workqueue(wq: ndev->tx_wq);
1302
1303 list_for_each_entry_safe(conn_info, n, &ndev->conn_info_list, list) {
1304 list_del(entry: &conn_info->list);
1305 /* conn_info is allocated with devm_kzalloc */
1306 }
1307
1308 nfc_unregister_device(dev: ndev->nfc_dev);
1309}
1310EXPORT_SYMBOL(nci_unregister_device);
1311
1312/**
1313 * nci_recv_frame - receive frame from NCI drivers
1314 *
1315 * @ndev: The nci device
1316 * @skb: The sk_buff to receive
1317 */
1318int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
1319{
1320 pr_debug("len %d\n", skb->len);
1321
1322 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
1323 !test_bit(NCI_INIT, &ndev->flags))) {
1324 kfree_skb(skb);
1325 return -ENXIO;
1326 }
1327
1328 /* Queue frame for rx worker thread */
1329 skb_queue_tail(list: &ndev->rx_q, newsk: skb);
1330 queue_work(wq: ndev->rx_wq, work: &ndev->rx_work);
1331
1332 return 0;
1333}
1334EXPORT_SYMBOL(nci_recv_frame);
1335
1336int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
1337{
1338 pr_debug("len %d\n", skb->len);
1339
1340 if (!ndev) {
1341 kfree_skb(skb);
1342 return -ENODEV;
1343 }
1344
1345 /* Get rid of skb owner, prior to sending to the driver. */
1346 skb_orphan(skb);
1347
1348 /* Send copy to sniffer */
1349 nfc_send_to_raw_sock(dev: ndev->nfc_dev, skb,
1350 RAW_PAYLOAD_NCI, NFC_DIRECTION_TX);
1351
1352 return ndev->ops->send(ndev, skb);
1353}
1354EXPORT_SYMBOL(nci_send_frame);
1355
1356/* Send NCI command */
1357int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, const void *payload)
1358{
1359 struct nci_ctrl_hdr *hdr;
1360 struct sk_buff *skb;
1361
1362 pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
1363
1364 skb = nci_skb_alloc(ndev, len: (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
1365 if (!skb) {
1366 pr_err("no memory for command\n");
1367 return -ENOMEM;
1368 }
1369
1370 hdr = skb_put(skb, NCI_CTRL_HDR_SIZE);
1371 hdr->gid = nci_opcode_gid(opcode);
1372 hdr->oid = nci_opcode_oid(opcode);
1373 hdr->plen = plen;
1374
1375 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
1376 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
1377
1378 if (plen)
1379 skb_put_data(skb, data: payload, len: plen);
1380
1381 skb_queue_tail(list: &ndev->cmd_q, newsk: skb);
1382 queue_work(wq: ndev->cmd_wq, work: &ndev->cmd_work);
1383
1384 return 0;
1385}
1386EXPORT_SYMBOL(nci_send_cmd);
1387
1388/* Proprietary commands API */
1389static const struct nci_driver_ops *ops_cmd_lookup(const struct nci_driver_ops *ops,
1390 size_t n_ops,
1391 __u16 opcode)
1392{
1393 size_t i;
1394 const struct nci_driver_ops *op;
1395
1396 if (!ops || !n_ops)
1397 return NULL;
1398
1399 for (i = 0; i < n_ops; i++) {
1400 op = &ops[i];
1401 if (op->opcode == opcode)
1402 return op;
1403 }
1404
1405 return NULL;
1406}
1407
1408static int nci_op_rsp_packet(struct nci_dev *ndev, __u16 rsp_opcode,
1409 struct sk_buff *skb, const struct nci_driver_ops *ops,
1410 size_t n_ops)
1411{
1412 const struct nci_driver_ops *op;
1413
1414 op = ops_cmd_lookup(ops, n_ops, opcode: rsp_opcode);
1415 if (!op || !op->rsp)
1416 return -ENOTSUPP;
1417
1418 return op->rsp(ndev, skb);
1419}
1420
1421static int nci_op_ntf_packet(struct nci_dev *ndev, __u16 ntf_opcode,
1422 struct sk_buff *skb, const struct nci_driver_ops *ops,
1423 size_t n_ops)
1424{
1425 const struct nci_driver_ops *op;
1426
1427 op = ops_cmd_lookup(ops, n_ops, opcode: ntf_opcode);
1428 if (!op || !op->ntf)
1429 return -ENOTSUPP;
1430
1431 return op->ntf(ndev, skb);
1432}
1433
1434int nci_prop_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1435 struct sk_buff *skb)
1436{
1437 return nci_op_rsp_packet(ndev, rsp_opcode: opcode, skb, ops: ndev->ops->prop_ops,
1438 n_ops: ndev->ops->n_prop_ops);
1439}
1440
1441int nci_prop_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1442 struct sk_buff *skb)
1443{
1444 return nci_op_ntf_packet(ndev, ntf_opcode: opcode, skb, ops: ndev->ops->prop_ops,
1445 n_ops: ndev->ops->n_prop_ops);
1446}
1447
1448int nci_core_rsp_packet(struct nci_dev *ndev, __u16 opcode,
1449 struct sk_buff *skb)
1450{
1451 return nci_op_rsp_packet(ndev, rsp_opcode: opcode, skb, ops: ndev->ops->core_ops,
1452 n_ops: ndev->ops->n_core_ops);
1453}
1454
1455int nci_core_ntf_packet(struct nci_dev *ndev, __u16 opcode,
1456 struct sk_buff *skb)
1457{
1458 return nci_op_ntf_packet(ndev, ntf_opcode: opcode, skb, ops: ndev->ops->core_ops,
1459 n_ops: ndev->ops->n_core_ops);
1460}
1461
1462/* ---- NCI TX Data worker thread ---- */
1463
1464static void nci_tx_work(struct work_struct *work)
1465{
1466 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
1467 struct nci_conn_info *conn_info;
1468 struct sk_buff *skb;
1469
1470 conn_info = nci_get_conn_info_by_conn_id(ndev, conn_id: ndev->cur_conn_id);
1471 if (!conn_info)
1472 return;
1473
1474 pr_debug("credits_cnt %d\n", atomic_read(&conn_info->credits_cnt));
1475
1476 /* Send queued tx data */
1477 while (atomic_read(v: &conn_info->credits_cnt)) {
1478 skb = skb_dequeue(list: &ndev->tx_q);
1479 if (!skb)
1480 return;
1481 kcov_remote_start_common(id: skb_get_kcov_handle(skb));
1482
1483 /* Check if data flow control is used */
1484 if (atomic_read(v: &conn_info->credits_cnt) !=
1485 NCI_DATA_FLOW_CONTROL_NOT_USED)
1486 atomic_dec(v: &conn_info->credits_cnt);
1487
1488 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
1489 nci_pbf(skb->data),
1490 nci_conn_id(skb->data),
1491 nci_plen(skb->data));
1492
1493 nci_send_frame(ndev, skb);
1494
1495 mod_timer(timer: &ndev->data_timer,
1496 expires: jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
1497 kcov_remote_stop();
1498 }
1499}
1500
1501/* ----- NCI RX worker thread (data & control) ----- */
1502
1503static void nci_rx_work(struct work_struct *work)
1504{
1505 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
1506 struct sk_buff *skb;
1507
1508 for (; (skb = skb_dequeue(list: &ndev->rx_q)); kcov_remote_stop()) {
1509 kcov_remote_start_common(id: skb_get_kcov_handle(skb));
1510
1511 /* Send copy to sniffer */
1512 nfc_send_to_raw_sock(dev: ndev->nfc_dev, skb,
1513 RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
1514
1515 /* Process frame */
1516 switch (nci_mt(skb->data)) {
1517 case NCI_MT_RSP_PKT:
1518 nci_rsp_packet(ndev, skb);
1519 break;
1520
1521 case NCI_MT_NTF_PKT:
1522 nci_ntf_packet(ndev, skb);
1523 break;
1524
1525 case NCI_MT_DATA_PKT:
1526 nci_rx_data_packet(ndev, skb);
1527 break;
1528
1529 default:
1530 pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
1531 kfree_skb(skb);
1532 break;
1533 }
1534 }
1535
1536 /* check if a data exchange timeout has occurred */
1537 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
1538 /* complete the data exchange transaction, if exists */
1539 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1540 nci_data_exchange_complete(ndev, NULL,
1541 conn_id: ndev->cur_conn_id,
1542 err: -ETIMEDOUT);
1543
1544 clear_bit(nr: NCI_DATA_EXCHANGE_TO, addr: &ndev->flags);
1545 }
1546}
1547
1548/* ----- NCI TX CMD worker thread ----- */
1549
1550static void nci_cmd_work(struct work_struct *work)
1551{
1552 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
1553 struct sk_buff *skb;
1554
1555 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
1556
1557 /* Send queued command */
1558 if (atomic_read(v: &ndev->cmd_cnt)) {
1559 skb = skb_dequeue(list: &ndev->cmd_q);
1560 if (!skb)
1561 return;
1562
1563 kcov_remote_start_common(id: skb_get_kcov_handle(skb));
1564 atomic_dec(v: &ndev->cmd_cnt);
1565
1566 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
1567 nci_pbf(skb->data),
1568 nci_opcode_gid(nci_opcode(skb->data)),
1569 nci_opcode_oid(nci_opcode(skb->data)),
1570 nci_plen(skb->data));
1571
1572 nci_send_frame(ndev, skb);
1573
1574 mod_timer(timer: &ndev->cmd_timer,
1575 expires: jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
1576 kcov_remote_stop();
1577 }
1578}
1579
1580MODULE_LICENSE("GPL");
1581

source code of linux/net/nfc/nci/core.c