projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
NFC: NCI: Don't reverse local general bytes
[linux-2.6-block.git] / net / nfc / nci / core.c
CommitLineData
6a2968aa
IE		 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 *
7 * Written by Ilan Elias <ilane@ti.com>
8 *
9 * Acknowledgements:
10 * This file is based on hci_core.c, which was written
11 * by Maxim Krasnyansky.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2
15 * as published by the Free Software Foundation
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
98b32dec 23 * along with this program; if not, see <http://www.gnu.org/licenses/>.
6a2968aa
IE		 24 *
25 */
26
52858b51 27#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
ed1e0ad8 28
8a70e7f8 29#include <linux/module.h>
6a2968aa
IE		 30#include <linux/types.h>
31#include <linux/workqueue.h>
32#include <linux/completion.h>
bc3b2d7f 33#include <linux/export.h>
6a2968aa
IE		 34#include <linux/sched.h>
35#include <linux/bitops.h>
36#include <linux/skbuff.h>
37
38#include "../nfc.h"
39#include <net/nfc/nci.h>
40#include <net/nfc/nci_core.h>
41#include <linux/nfc.h>
42
43static void nci_cmd_work(struct work_struct *work);
44static void nci_rx_work(struct work_struct *work);
45static void nci_tx_work(struct work_struct *work);
46
47/* ---- NCI requests ---- */
48
49void nci_req_complete(struct nci_dev *ndev, int result)
50{
51 if (ndev->req_status == NCI_REQ_PEND) {
52 ndev->req_result = result;
53 ndev->req_status = NCI_REQ_DONE;
54 complete(&ndev->req_completion);
55 }
56}
57
58static void nci_req_cancel(struct nci_dev *ndev, int err)
59{
60 if (ndev->req_status == NCI_REQ_PEND) {
61 ndev->req_result = err;
62 ndev->req_status = NCI_REQ_CANCELED;
63 complete(&ndev->req_completion);
64 }
65}
66
67/* Execute request and wait for completion. */
68static int __nci_request(struct nci_dev *ndev,
eb9bc6e9
SO		 69 void (*req)(struct nci_dev *ndev, unsigned long opt),
70 unsigned long opt, __u32 timeout)
6a2968aa
IE		 71{
72 int rc = 0;
f8c141c3 73 long completion_rc;
6a2968aa
IE		 74
75 ndev->req_status = NCI_REQ_PEND;
76
77 init_completion(&ndev->req_completion);
78 req(ndev, opt);
eb9bc6e9
SO		 79 completion_rc =
80 wait_for_completion_interruptible_timeout(&ndev->req_completion,
81 timeout);
6a2968aa 82
20c239c1 83 pr_debug("wait_for_completion return %ld\n", completion_rc);
6a2968aa
IE		 84
85 if (completion_rc > 0) {
86 switch (ndev->req_status) {
87 case NCI_REQ_DONE:
88 rc = nci_to_errno(ndev->req_result);
89 break;
90
91 case NCI_REQ_CANCELED:
92 rc = -ndev->req_result;
93 break;
94
95 default:
96 rc = -ETIMEDOUT;
97 break;
98 }
99 } else {
ed1e0ad8
JP		 100 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
101 completion_rc);
6a2968aa
IE		 102
103 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
104 }
105
106 ndev->req_status = ndev->req_result = 0;
107
108 return rc;
109}
110
111static inline int nci_request(struct nci_dev *ndev,
eb9bc6e9
SO		 112 void (*req)(struct nci_dev *ndev,
113 unsigned long opt),
114 unsigned long opt, __u32 timeout)
6a2968aa
IE		 115{
116 int rc;
117
118 if (!test_bit(NCI_UP, &ndev->flags))
119 return -ENETDOWN;
120
121 /* Serialize all requests */
122 mutex_lock(&ndev->req_lock);
123 rc = __nci_request(ndev, req, opt, timeout);
124 mutex_unlock(&ndev->req_lock);
125
126 return rc;
127}
128
129static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
130{
e8c0dacd
IE		 131 struct nci_core_reset_cmd cmd;
132
133 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
134 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
6a2968aa
IE		 135}
136
137static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
138{
139 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
140}
141
142static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
143{
2eb1dc10
IE		 144 struct nci_rf_disc_map_cmd cmd;
145 struct disc_map_config *cfg = cmd.mapping_configs;
146 __u8 *num = &cmd.num_mapping_configs;
6a2968aa
IE		 147 int i;
148
6a2968aa 149 /* set rf mapping configurations */
2eb1dc10 150 *num = 0;
6a2968aa
IE		 151
152 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */
153 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
154 if (ndev->supported_rf_interfaces[i] ==
eb9bc6e9 155 NCI_RF_INTERFACE_ISO_DEP) {
2eb1dc10 156 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
637d85a7
IE		 157 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
158 NCI_DISC_MAP_MODE_LISTEN;
159 cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
2eb1dc10 160 (*num)++;
6a2968aa 161 } else if (ndev->supported_rf_interfaces[i] ==
eb9bc6e9 162 NCI_RF_INTERFACE_NFC_DEP) {
2eb1dc10 163 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
637d85a7
IE		 164 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
165 NCI_DISC_MAP_MODE_LISTEN;
166 cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
2eb1dc10 167 (*num)++;
6a2968aa
IE		 168 }
169
2eb1dc10 170 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
6a2968aa
IE		 171 break;
172 }
173
174 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
eb9bc6e9 175 (1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
6a2968aa
IE		 176}
177
7e035230
IE		 178struct nci_set_config_param {
179 __u8 id;
180 size_t len;
181 __u8 *val;
182};
183
184static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt)
185{
186 struct nci_set_config_param *param = (struct nci_set_config_param *)opt;
187 struct nci_core_set_config_cmd cmd;
188
189 BUG_ON(param->len > NCI_MAX_PARAM_LEN);
190
191 cmd.num_params = 1;
192 cmd.param.id = param->id;
193 cmd.param.len = param->len;
194 memcpy(cmd.param.val, param->val, param->len);
195
196 nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd);
197}
198
6a2968aa
IE		 199static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
200{
201 struct nci_rf_disc_cmd cmd;
202 __u32 protocols = opt;
203
204 cmd.num_disc_configs = 0;
205
206 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
874934f4
SJ		 207 (protocols & NFC_PROTO_JEWEL_MASK ||
208 protocols & NFC_PROTO_MIFARE_MASK ||
209 protocols & NFC_PROTO_ISO14443_MASK ||
210 protocols & NFC_PROTO_NFC_DEP_MASK)) {
637d85a7 211 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
eb9bc6e9 212 NCI_NFC_A_PASSIVE_POLL_MODE;
6a2968aa
IE		 213 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
214 cmd.num_disc_configs++;
215 }
216
217 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
01d719a2 218 (protocols & NFC_PROTO_ISO14443_B_MASK)) {
637d85a7 219 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
eb9bc6e9 220 NCI_NFC_B_PASSIVE_POLL_MODE;
6a2968aa
IE		 221 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
222 cmd.num_disc_configs++;
223 }
224
225 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
874934f4
SJ		 226 (protocols & NFC_PROTO_FELICA_MASK ||
227 protocols & NFC_PROTO_NFC_DEP_MASK)) {
637d85a7 228 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
eb9bc6e9 229 NCI_NFC_F_PASSIVE_POLL_MODE;
6a2968aa
IE		 230 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
231 cmd.num_disc_configs++;
232 }
233
234 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
eb9bc6e9
SO		 235 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
236 &cmd);
6a2968aa
IE		 237}
238
019c4fba
IE		 239struct nci_rf_discover_select_param {
240 __u8 rf_discovery_id;
241 __u8 rf_protocol;
242};
243
244static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
245{
246 struct nci_rf_discover_select_param *param =
eb9bc6e9 247 (struct nci_rf_discover_select_param *)opt;
019c4fba
IE		 248 struct nci_rf_discover_select_cmd cmd;
249
250 cmd.rf_discovery_id = param->rf_discovery_id;
251 cmd.rf_protocol = param->rf_protocol;
252
253 switch (cmd.rf_protocol) {
254 case NCI_RF_PROTOCOL_ISO_DEP:
255 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
256 break;
257
258 case NCI_RF_PROTOCOL_NFC_DEP:
259 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
260 break;
261
262 default:
263 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
264 break;
265 }
266
267 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
eb9bc6e9 268 sizeof(struct nci_rf_discover_select_cmd), &cmd);
019c4fba
IE		 269}
270
6a2968aa
IE		 271static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
272{
273 struct nci_rf_deactivate_cmd cmd;
274
275 cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE;
276
277 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
eb9bc6e9 278 sizeof(struct nci_rf_deactivate_cmd), &cmd);
6a2968aa
IE		 279}
280
281static int nci_open_device(struct nci_dev *ndev)
282{
283 int rc = 0;
284
285 mutex_lock(&ndev->req_lock);
286
287 if (test_bit(NCI_UP, &ndev->flags)) {
288 rc = -EALREADY;
289 goto done;
290 }
291
292 if (ndev->ops->open(ndev)) {
293 rc = -EIO;
294 goto done;
295 }
296
297 atomic_set(&ndev->cmd_cnt, 1);
298
299 set_bit(NCI_INIT, &ndev->flags);
300
301 rc = __nci_request(ndev, nci_reset_req, 0,
eb9bc6e9 302 msecs_to_jiffies(NCI_RESET_TIMEOUT));
6a2968aa
IE		 303
304 if (!rc) {
305 rc = __nci_request(ndev, nci_init_req, 0,
eb9bc6e9 306 msecs_to_jiffies(NCI_INIT_TIMEOUT));
6a2968aa
IE		 307 }
308
309 if (!rc) {
310 rc = __nci_request(ndev, nci_init_complete_req, 0,
eb9bc6e9 311 msecs_to_jiffies(NCI_INIT_TIMEOUT));
6a2968aa
IE		 312 }
313
314 clear_bit(NCI_INIT, &ndev->flags);
315
316 if (!rc) {
317 set_bit(NCI_UP, &ndev->flags);
019c4fba 318 nci_clear_target_list(ndev);
8939e47f 319 atomic_set(&ndev->state, NCI_IDLE);
6a2968aa
IE		 320 } else {
321 /* Init failed, cleanup */
322 skb_queue_purge(&ndev->cmd_q);
323 skb_queue_purge(&ndev->rx_q);
324 skb_queue_purge(&ndev->tx_q);
325
326 ndev->ops->close(ndev);
327 ndev->flags = 0;
328 }
329
330done:
331 mutex_unlock(&ndev->req_lock);
332 return rc;
333}
334
335static int nci_close_device(struct nci_dev *ndev)
336{
337 nci_req_cancel(ndev, ENODEV);
338 mutex_lock(&ndev->req_lock);
339
340 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
341 del_timer_sync(&ndev->cmd_timer);
c4bf98b2 342 del_timer_sync(&ndev->data_timer);
6a2968aa
IE		 343 mutex_unlock(&ndev->req_lock);
344 return 0;
345 }
346
347 /* Drop RX and TX queues */
348 skb_queue_purge(&ndev->rx_q);
349 skb_queue_purge(&ndev->tx_q);
350
351 /* Flush RX and TX wq */
352 flush_workqueue(ndev->rx_wq);
353 flush_workqueue(ndev->tx_wq);
354
355 /* Reset device */
356 skb_queue_purge(&ndev->cmd_q);
357 atomic_set(&ndev->cmd_cnt, 1);
358
359 set_bit(NCI_INIT, &ndev->flags);
360 __nci_request(ndev, nci_reset_req, 0,
eb9bc6e9 361 msecs_to_jiffies(NCI_RESET_TIMEOUT));
6a2968aa
IE		 362 clear_bit(NCI_INIT, &ndev->flags);
363
fa9be5f0
AK		 364 del_timer_sync(&ndev->cmd_timer);
365
6a2968aa
IE		 366 /* Flush cmd wq */
367 flush_workqueue(ndev->cmd_wq);
368
369 /* After this point our queues are empty
370 * and no works are scheduled. */
371 ndev->ops->close(ndev);
372
373 /* Clear flags */
374 ndev->flags = 0;
375
376 mutex_unlock(&ndev->req_lock);
377
378 return 0;
379}
380
381/* NCI command timer function */
382static void nci_cmd_timer(unsigned long arg)
383{
384 struct nci_dev *ndev = (void *) arg;
385
6a2968aa
IE		 386 atomic_set(&ndev->cmd_cnt, 1);
387 queue_work(ndev->cmd_wq, &ndev->cmd_work);
388}
389
c4bf98b2
IE		 390/* NCI data exchange timer function */
391static void nci_data_timer(unsigned long arg)
392{
393 struct nci_dev *ndev = (void *) arg;
394
395 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
396 queue_work(ndev->rx_wq, &ndev->rx_work);
397}
398
6a2968aa
IE		 399static int nci_dev_up(struct nfc_dev *nfc_dev)
400{
401 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
402
6a2968aa
IE		 403 return nci_open_device(ndev);
404}
405
406static int nci_dev_down(struct nfc_dev *nfc_dev)
407{
408 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
409
6a2968aa
IE		 410 return nci_close_device(ndev);
411}
412
7e035230
IE		 413static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
414{
415 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
416 struct nci_set_config_param param;
7e035230
IE		 417
418 param.val = nfc_get_local_general_bytes(nfc_dev, &param.len);
419 if ((param.val == NULL) || (param.len == 0))
f9fc36f4 420 return 0;
7e035230 421
460d8f97 422 if (param.len > NFC_MAX_GT_LEN)
7e035230
IE		 423 return -EINVAL;
424
7e035230 425 param.id = NCI_PN_ATR_REQ_GEN_BYTES;
7e035230 426
f9fc36f4
SJ		 427 return nci_request(ndev, nci_set_config_req, (unsigned long)&param,
428 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
7e035230
IE		 429}
430
fe7c5800
SO		 431static int nci_start_poll(struct nfc_dev *nfc_dev,
432 __u32 im_protocols, __u32 tm_protocols)
6a2968aa
IE		 433{
434 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
435 int rc;
436
019c4fba 437 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
eb9bc6e9 438 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
ed1e0ad8 439 pr_err("unable to start poll, since poll is already active\n");
6a2968aa
IE		 440 return -EBUSY;
441 }
442
de054799 443 if (ndev->target_active_prot) {
ed1e0ad8 444 pr_err("there is an active target\n");
de054799
IE		 445 return -EBUSY;
446 }
447
019c4fba 448 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
eb9bc6e9 449 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
019c4fba 450 pr_debug("target active or w4 select, implicitly deactivate\n");
6a2968aa
IE		 451
452 rc = nci_request(ndev, nci_rf_deactivate_req, 0,
eb9bc6e9 453 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
6a2968aa
IE		 454 if (rc)
455 return -EBUSY;
456 }
457
7e035230
IE		 458 if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
459 rc = nci_set_local_general_bytes(nfc_dev);
460 if (rc) {
461 pr_err("failed to set local general bytes\n");
462 return rc;
463 }
464 }
465
fe7c5800 466 rc = nci_request(ndev, nci_rf_discover_req, im_protocols,
eb9bc6e9 467 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
6a2968aa
IE		 468
469 if (!rc)
fe7c5800 470 ndev->poll_prots = im_protocols;
6a2968aa
IE		 471
472 return rc;
473}
474
475static void nci_stop_poll(struct nfc_dev *nfc_dev)
476{
477 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
478
019c4fba 479 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
eb9bc6e9 480 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
ed1e0ad8 481 pr_err("unable to stop poll, since poll is not active\n");
6a2968aa
IE		 482 return;
483 }
484
485 nci_request(ndev, nci_rf_deactivate_req, 0,
eb9bc6e9 486 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
6a2968aa
IE		 487}
488
90099433
EL		 489static int nci_activate_target(struct nfc_dev *nfc_dev,
490 struct nfc_target *target, __u32 protocol)
6a2968aa
IE		 491{
492 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
019c4fba 493 struct nci_rf_discover_select_param param;
90099433 494 struct nfc_target *nci_target = NULL;
019c4fba
IE		 495 int i;
496 int rc = 0;
6a2968aa 497
90099433 498 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
6a2968aa 499
019c4fba 500 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
eb9bc6e9 501 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
ed1e0ad8 502 pr_err("there is no available target to activate\n");
6a2968aa
IE		 503 return -EINVAL;
504 }
505
506 if (ndev->target_active_prot) {
ed1e0ad8 507 pr_err("there is already an active target\n");
6a2968aa
IE		 508 return -EBUSY;
509 }
510
019c4fba 511 for (i = 0; i < ndev->n_targets; i++) {
90099433
EL		 512 if (ndev->targets[i].idx == target->idx) {
513 nci_target = &ndev->targets[i];
019c4fba
IE		 514 break;
515 }
516 }
517
90099433 518 if (!nci_target) {
019c4fba
IE		 519 pr_err("unable to find the selected target\n");
520 return -EINVAL;
521 }
522
90099433 523 if (!(nci_target->supported_protocols & (1 << protocol))) {
ed1e0ad8
JP		 524 pr_err("target does not support the requested protocol 0x%x\n",
525 protocol);
6a2968aa
IE		 526 return -EINVAL;
527 }
528
019c4fba 529 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
90099433 530 param.rf_discovery_id = nci_target->logical_idx;
019c4fba
IE		 531
532 if (protocol == NFC_PROTO_JEWEL)
533 param.rf_protocol = NCI_RF_PROTOCOL_T1T;
534 else if (protocol == NFC_PROTO_MIFARE)
535 param.rf_protocol = NCI_RF_PROTOCOL_T2T;
536 else if (protocol == NFC_PROTO_FELICA)
537 param.rf_protocol = NCI_RF_PROTOCOL_T3T;
01d719a2
SO		 538 else if (protocol == NFC_PROTO_ISO14443 ||
539 protocol == NFC_PROTO_ISO14443_B)
019c4fba
IE		 540 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
541 else
542 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
543
544 rc = nci_request(ndev, nci_rf_discover_select_req,
eb9bc6e9
SO		 545 (unsigned long)&param,
546 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
019c4fba 547 }
6a2968aa 548
019c4fba
IE		 549 if (!rc)
550 ndev->target_active_prot = protocol;
551
552 return rc;
6a2968aa
IE		 553}
554
90099433
EL		 555static void nci_deactivate_target(struct nfc_dev *nfc_dev,
556 struct nfc_target *target)
6a2968aa
IE		 557{
558 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
559
767f19ae 560 pr_debug("entry\n");
6a2968aa
IE		 561
562 if (!ndev->target_active_prot) {
ed1e0ad8 563 pr_err("unable to deactivate target, no active target\n");
6a2968aa
IE		 564 return;
565 }
566
567 ndev->target_active_prot = 0;
568
8939e47f 569 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
6a2968aa 570 nci_request(ndev, nci_rf_deactivate_req, 0,
eb9bc6e9 571 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
6a2968aa
IE		 572 }
573}
574
767f19ae
IE		 575static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
576 __u8 comm_mode, __u8 *gb, size_t gb_len)
577{
578 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
579 int rc;
580
581 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
582
583 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
584 if (rc)
585 return rc;
586
587 rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
588 ndev->remote_gb_len);
589 if (!rc)
590 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
591 NFC_RF_INITIATOR);
592
593 return rc;
594}
595
596static int nci_dep_link_down(struct nfc_dev *nfc_dev)
597{
598 pr_debug("entry\n");
599
600 nci_deactivate_target(nfc_dev, NULL);
601
602 return 0;
603}
604
605
be9ae4ce
SO		 606static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
607 struct sk_buff *skb,
608 data_exchange_cb_t cb, void *cb_context)
6a2968aa
IE		 609{
610 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
38f04c6b 611 int rc;
6a2968aa 612
90099433 613 pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
6a2968aa
IE		 614
615 if (!ndev->target_active_prot) {
ed1e0ad8 616 pr_err("unable to exchange data, no active target\n");
6a2968aa
IE		 617 return -EINVAL;
618 }
619
38f04c6b
IE		 620 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
621 return -EBUSY;
622
6a2968aa
IE		 623 /* store cb and context to be used on receiving data */
624 ndev->data_exchange_cb = cb;
625 ndev->data_exchange_cb_context = cb_context;
626
e8c0dacd 627 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
38f04c6b
IE		 628 if (rc)
629 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
630
631 return rc;
6a2968aa
IE		 632}
633
0a946301
SO		 634static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
635{
636 return 0;
637}
638
639static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
640{
641 return 0;
642}
643
644static int nci_discover_se(struct nfc_dev *nfc_dev)
645{
646 return 0;
647}
648
6a2968aa
IE		 649static struct nfc_ops nci_nfc_ops = {
650 .dev_up = nci_dev_up,
651 .dev_down = nci_dev_down,
652 .start_poll = nci_start_poll,
653 .stop_poll = nci_stop_poll,
767f19ae
IE		 654 .dep_link_up = nci_dep_link_up,
655 .dep_link_down = nci_dep_link_down,
6a2968aa
IE		 656 .activate_target = nci_activate_target,
657 .deactivate_target = nci_deactivate_target,
be9ae4ce 658 .im_transceive = nci_transceive,
0a946301
SO		 659 .enable_se = nci_enable_se,
660 .disable_se = nci_disable_se,
661 .discover_se = nci_discover_se,
6a2968aa
IE		 662};
663
664/* ---- Interface to NCI drivers ---- */
665
666/**
667 * nci_allocate_device - allocate a new nci device
668 *
669 * @ops: device operations
670 * @supported_protocols: NFC protocols supported by the device
671 */
672struct nci_dev *nci_allocate_device(struct nci_ops *ops,
eb9bc6e9
SO		 673 __u32 supported_protocols,
674 int tx_headroom, int tx_tailroom)
6a2968aa 675{
8ebafde0 676 struct nci_dev *ndev;
6a2968aa 677
24bf3304 678 pr_debug("supported_protocols 0x%x\n", supported_protocols);
6a2968aa
IE		 679
680 if (!ops->open || !ops->close || !ops->send)
8ebafde0 681 return NULL;
6a2968aa
IE		 682
683 if (!supported_protocols)
8ebafde0 684 return NULL;
6a2968aa
IE		 685
686 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
687 if (!ndev)
8ebafde0 688 return NULL;
6a2968aa
IE		 689
690 ndev->ops = ops;
691 ndev->tx_headroom = tx_headroom;
692 ndev->tx_tailroom = tx_tailroom;
693
694 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
eb9bc6e9
SO		 695 supported_protocols,
696 tx_headroom + NCI_DATA_HDR_SIZE,
697 tx_tailroom);
6a2968aa
IE		 698 if (!ndev->nfc_dev)
699 goto free_exit;
700
701 nfc_set_drvdata(ndev->nfc_dev, ndev);
702
8ebafde0 703 return ndev;
6a2968aa
IE		 704
705free_exit:
706 kfree(ndev);
8ebafde0 707 return NULL;
6a2968aa
IE		 708}
709EXPORT_SYMBOL(nci_allocate_device);
710
711/**
712 * nci_free_device - deallocate nci device
713 *
714 * @ndev: The nci device to deallocate
715 */
716void nci_free_device(struct nci_dev *ndev)
717{
6a2968aa
IE		 718 nfc_free_device(ndev->nfc_dev);
719 kfree(ndev);
720}
721EXPORT_SYMBOL(nci_free_device);
722
723/**
724 * nci_register_device - register a nci device in the nfc subsystem
725 *
726 * @dev: The nci device to register
727 */
728int nci_register_device(struct nci_dev *ndev)
729{
730 int rc;
731 struct device *dev = &ndev->nfc_dev->dev;
732 char name[32];
733
6a2968aa
IE		 734 rc = nfc_register_device(ndev->nfc_dev);
735 if (rc)
736 goto exit;
737
738 ndev->flags = 0;
739
740 INIT_WORK(&ndev->cmd_work, nci_cmd_work);
741 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
742 ndev->cmd_wq = create_singlethread_workqueue(name);
743 if (!ndev->cmd_wq) {
744 rc = -ENOMEM;
745 goto unreg_exit;
746 }
747
748 INIT_WORK(&ndev->rx_work, nci_rx_work);
749 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
750 ndev->rx_wq = create_singlethread_workqueue(name);
751 if (!ndev->rx_wq) {
752 rc = -ENOMEM;
753 goto destroy_cmd_wq_exit;
754 }
755
756 INIT_WORK(&ndev->tx_work, nci_tx_work);
757 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
758 ndev->tx_wq = create_singlethread_workqueue(name);
759 if (!ndev->tx_wq) {
760 rc = -ENOMEM;
761 goto destroy_rx_wq_exit;
762 }
763
764 skb_queue_head_init(&ndev->cmd_q);
765 skb_queue_head_init(&ndev->rx_q);
766 skb_queue_head_init(&ndev->tx_q);
767
768 setup_timer(&ndev->cmd_timer, nci_cmd_timer,
eb9bc6e9 769 (unsigned long) ndev);
c4bf98b2 770 setup_timer(&ndev->data_timer, nci_data_timer,
eb9bc6e9 771 (unsigned long) ndev);
6a2968aa
IE		 772
773 mutex_init(&ndev->req_lock);
774
775 goto exit;
776
777destroy_rx_wq_exit:
778 destroy_workqueue(ndev->rx_wq);
779
780destroy_cmd_wq_exit:
781 destroy_workqueue(ndev->cmd_wq);
782
783unreg_exit:
784 nfc_unregister_device(ndev->nfc_dev);
785
786exit:
787 return rc;
788}
789EXPORT_SYMBOL(nci_register_device);
790
791/**
792 * nci_unregister_device - unregister a nci device in the nfc subsystem
793 *
794 * @dev: The nci device to unregister
795 */
796void nci_unregister_device(struct nci_dev *ndev)
797{
6a2968aa
IE		 798 nci_close_device(ndev);
799
800 destroy_workqueue(ndev->cmd_wq);
801 destroy_workqueue(ndev->rx_wq);
802 destroy_workqueue(ndev->tx_wq);
803
804 nfc_unregister_device(ndev->nfc_dev);
805}
806EXPORT_SYMBOL(nci_unregister_device);
807
808/**
809 * nci_recv_frame - receive frame from NCI drivers
810 *
1095e69f 811 * @ndev: The nci device
6a2968aa
IE		 812 * @skb: The sk_buff to receive
813 */
1095e69f 814int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
6a2968aa 815{
24bf3304 816 pr_debug("len %d\n", skb->len);
6a2968aa 817
874934f4
SJ		 818 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
819 !test_bit(NCI_INIT, &ndev->flags))) {
6a2968aa
IE		 820 kfree_skb(skb);
821 return -ENXIO;
822 }
823
824 /* Queue frame for rx worker thread */
825 skb_queue_tail(&ndev->rx_q, skb);
826 queue_work(ndev->rx_wq, &ndev->rx_work);
827
828 return 0;
829}
830EXPORT_SYMBOL(nci_recv_frame);
831
1095e69f 832static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
6a2968aa 833{
24bf3304 834 pr_debug("len %d\n", skb->len);
6a2968aa
IE		 835
836 if (!ndev) {
837 kfree_skb(skb);
838 return -ENODEV;
839 }
840
841 /* Get rid of skb owner, prior to sending to the driver. */
842 skb_orphan(skb);
843
1095e69f 844 return ndev->ops->send(ndev, skb);
6a2968aa
IE		 845}
846
847/* Send NCI command */
848int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
849{
850 struct nci_ctrl_hdr *hdr;
851 struct sk_buff *skb;
852
24bf3304 853 pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
6a2968aa
IE		 854
855 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
856 if (!skb) {
ed1e0ad8 857 pr_err("no memory for command\n");
6a2968aa
IE		 858 return -ENOMEM;
859 }
860
861 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
862 hdr->gid = nci_opcode_gid(opcode);
863 hdr->oid = nci_opcode_oid(opcode);
864 hdr->plen = plen;
865
866 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
867 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
868
869 if (plen)
870 memcpy(skb_put(skb, plen), payload, plen);
871
6a2968aa
IE		 872 skb_queue_tail(&ndev->cmd_q, skb);
873 queue_work(ndev->cmd_wq, &ndev->cmd_work);
874
875 return 0;
876}
877
878/* ---- NCI TX Data worker thread ---- */
879
880static void nci_tx_work(struct work_struct *work)
881{
882 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
883 struct sk_buff *skb;
884
24bf3304 885 pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt));
6a2968aa
IE		 886
887 /* Send queued tx data */
888 while (atomic_read(&ndev->credits_cnt)) {
889 skb = skb_dequeue(&ndev->tx_q);
890 if (!skb)
891 return;
892
db98c829
IE		 893 /* Check if data flow control is used */
894 if (atomic_read(&ndev->credits_cnt) !=
eb9bc6e9 895 NCI_DATA_FLOW_CONTROL_NOT_USED)
db98c829 896 atomic_dec(&ndev->credits_cnt);
6a2968aa 897
20c239c1
JP		 898 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
899 nci_pbf(skb->data),
900 nci_conn_id(skb->data),
901 nci_plen(skb->data));
6a2968aa 902
1095e69f 903 nci_send_frame(ndev, skb);
c4bf98b2
IE		 904
905 mod_timer(&ndev->data_timer,
eb9bc6e9 906 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
6a2968aa
IE		 907 }
908}
909
910/* ----- NCI RX worker thread (data & control) ----- */
911
912static void nci_rx_work(struct work_struct *work)
913{
914 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
915 struct sk_buff *skb;
916
917 while ((skb = skb_dequeue(&ndev->rx_q))) {
918 /* Process frame */
919 switch (nci_mt(skb->data)) {
920 case NCI_MT_RSP_PKT:
921 nci_rsp_packet(ndev, skb);
922 break;
923
924 case NCI_MT_NTF_PKT:
925 nci_ntf_packet(ndev, skb);
926 break;
927
928 case NCI_MT_DATA_PKT:
929 nci_rx_data_packet(ndev, skb);
930 break;
931
932 default:
ed1e0ad8 933 pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
6a2968aa
IE		 934 kfree_skb(skb);
935 break;
936 }
937 }
c4bf98b2
IE		 938
939 /* check if a data exchange timout has occurred */
940 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
941 /* complete the data exchange transaction, if exists */
942 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
943 nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT);
944
945 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
946 }
6a2968aa
IE		 947}
948
949/* ----- NCI TX CMD worker thread ----- */
950
951static void nci_cmd_work(struct work_struct *work)
952{
953 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
954 struct sk_buff *skb;
955
24bf3304 956 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
6a2968aa
IE		 957
958 /* Send queued command */
959 if (atomic_read(&ndev->cmd_cnt)) {
960 skb = skb_dequeue(&ndev->cmd_q);
961 if (!skb)
962 return;
963
964 atomic_dec(&ndev->cmd_cnt);
965
20c239c1
JP		 966 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
967 nci_pbf(skb->data),
968 nci_opcode_gid(nci_opcode(skb->data)),
969 nci_opcode_oid(nci_opcode(skb->data)),
970 nci_plen(skb->data));
6a2968aa 971
1095e69f 972 nci_send_frame(ndev, skb);
6a2968aa
IE		 973
974 mod_timer(&ndev->cmd_timer,
eb9bc6e9 975 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
6a2968aa
IE		 976 }
977}
8a70e7f8
DJ		 978
979MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)