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NFC: Remove the static supported_se field
[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
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 */
27
52858b51 28#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
ed1e0ad8 29
8a70e7f8 30#include <linux/module.h>
6a2968aa
IE		 31#include <linux/types.h>
32#include <linux/workqueue.h>
33#include <linux/completion.h>
bc3b2d7f 34#include <linux/export.h>
6a2968aa
IE		 35#include <linux/sched.h>
36#include <linux/bitops.h>
37#include <linux/skbuff.h>
38
39#include "../nfc.h"
40#include <net/nfc/nci.h>
41#include <net/nfc/nci_core.h>
42#include <linux/nfc.h>
43
44static void nci_cmd_work(struct work_struct *work);
45static void nci_rx_work(struct work_struct *work);
46static void nci_tx_work(struct work_struct *work);
47
48/* ---- NCI requests ---- */
49
50void nci_req_complete(struct nci_dev *ndev, int result)
51{
52 if (ndev->req_status == NCI_REQ_PEND) {
53 ndev->req_result = result;
54 ndev->req_status = NCI_REQ_DONE;
55 complete(&ndev->req_completion);
56 }
57}
58
59static void nci_req_cancel(struct nci_dev *ndev, int err)
60{
61 if (ndev->req_status == NCI_REQ_PEND) {
62 ndev->req_result = err;
63 ndev->req_status = NCI_REQ_CANCELED;
64 complete(&ndev->req_completion);
65 }
66}
67
68/* Execute request and wait for completion. */
69static int __nci_request(struct nci_dev *ndev,
eb9bc6e9
SO		 70 void (*req)(struct nci_dev *ndev, unsigned long opt),
71 unsigned long opt, __u32 timeout)
6a2968aa
IE		 72{
73 int rc = 0;
f8c141c3 74 long completion_rc;
6a2968aa
IE		 75
76 ndev->req_status = NCI_REQ_PEND;
77
78 init_completion(&ndev->req_completion);
79 req(ndev, opt);
eb9bc6e9
SO		 80 completion_rc =
81 wait_for_completion_interruptible_timeout(&ndev->req_completion,
82 timeout);
6a2968aa 83
20c239c1 84 pr_debug("wait_for_completion return %ld\n", completion_rc);
6a2968aa
IE		 85
86 if (completion_rc > 0) {
87 switch (ndev->req_status) {
88 case NCI_REQ_DONE:
89 rc = nci_to_errno(ndev->req_result);
90 break;
91
92 case NCI_REQ_CANCELED:
93 rc = -ndev->req_result;
94 break;
95
96 default:
97 rc = -ETIMEDOUT;
98 break;
99 }
100 } else {
ed1e0ad8
JP		 101 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
102 completion_rc);
6a2968aa
IE		 103
104 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
105 }
106
107 ndev->req_status = ndev->req_result = 0;
108
109 return rc;
110}
111
112static inline int nci_request(struct nci_dev *ndev,
eb9bc6e9
SO		 113 void (*req)(struct nci_dev *ndev,
114 unsigned long opt),
115 unsigned long opt, __u32 timeout)
6a2968aa
IE		 116{
117 int rc;
118
119 if (!test_bit(NCI_UP, &ndev->flags))
120 return -ENETDOWN;
121
122 /* Serialize all requests */
123 mutex_lock(&ndev->req_lock);
124 rc = __nci_request(ndev, req, opt, timeout);
125 mutex_unlock(&ndev->req_lock);
126
127 return rc;
128}
129
130static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
131{
e8c0dacd
IE		 132 struct nci_core_reset_cmd cmd;
133
134 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
135 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
6a2968aa
IE		 136}
137
138static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
139{
140 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
141}
142
143static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
144{
2eb1dc10
IE		 145 struct nci_rf_disc_map_cmd cmd;
146 struct disc_map_config *cfg = cmd.mapping_configs;
147 __u8 *num = &cmd.num_mapping_configs;
6a2968aa
IE		 148 int i;
149
6a2968aa 150 /* set rf mapping configurations */
2eb1dc10 151 *num = 0;
6a2968aa
IE		 152
153 /* by default mapping is set to NCI_RF_INTERFACE_FRAME */
154 for (i = 0; i < ndev->num_supported_rf_interfaces; i++) {
155 if (ndev->supported_rf_interfaces[i] ==
eb9bc6e9 156 NCI_RF_INTERFACE_ISO_DEP) {
2eb1dc10 157 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
637d85a7
IE		 158 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
159 NCI_DISC_MAP_MODE_LISTEN;
160 cfg[*num].rf_interface = NCI_RF_INTERFACE_ISO_DEP;
2eb1dc10 161 (*num)++;
6a2968aa 162 } else if (ndev->supported_rf_interfaces[i] ==
eb9bc6e9 163 NCI_RF_INTERFACE_NFC_DEP) {
2eb1dc10 164 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
637d85a7
IE		 165 cfg[*num].mode = NCI_DISC_MAP_MODE_POLL |
166 NCI_DISC_MAP_MODE_LISTEN;
167 cfg[*num].rf_interface = NCI_RF_INTERFACE_NFC_DEP;
2eb1dc10 168 (*num)++;
6a2968aa
IE		 169 }
170
2eb1dc10 171 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
6a2968aa
IE		 172 break;
173 }
174
175 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
eb9bc6e9 176 (1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
6a2968aa
IE		 177}
178
7e035230
IE		 179struct nci_set_config_param {
180 __u8 id;
181 size_t len;
182 __u8 *val;
183};
184
185static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt)
186{
187 struct nci_set_config_param *param = (struct nci_set_config_param *)opt;
188 struct nci_core_set_config_cmd cmd;
189
190 BUG_ON(param->len > NCI_MAX_PARAM_LEN);
191
192 cmd.num_params = 1;
193 cmd.param.id = param->id;
194 cmd.param.len = param->len;
195 memcpy(cmd.param.val, param->val, param->len);
196
197 nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd);
198}
199
6a2968aa
IE		 200static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
201{
202 struct nci_rf_disc_cmd cmd;
203 __u32 protocols = opt;
204
205 cmd.num_disc_configs = 0;
206
207 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
874934f4
SJ		 208 (protocols & NFC_PROTO_JEWEL_MASK ||
209 protocols & NFC_PROTO_MIFARE_MASK ||
210 protocols & NFC_PROTO_ISO14443_MASK ||
211 protocols & NFC_PROTO_NFC_DEP_MASK)) {
637d85a7 212 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
eb9bc6e9 213 NCI_NFC_A_PASSIVE_POLL_MODE;
6a2968aa
IE		 214 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
215 cmd.num_disc_configs++;
216 }
217
218 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
01d719a2 219 (protocols & NFC_PROTO_ISO14443_B_MASK)) {
637d85a7 220 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
eb9bc6e9 221 NCI_NFC_B_PASSIVE_POLL_MODE;
6a2968aa
IE		 222 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
223 cmd.num_disc_configs++;
224 }
225
226 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
874934f4
SJ		 227 (protocols & NFC_PROTO_FELICA_MASK ||
228 protocols & NFC_PROTO_NFC_DEP_MASK)) {
637d85a7 229 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
eb9bc6e9 230 NCI_NFC_F_PASSIVE_POLL_MODE;
6a2968aa
IE		 231 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
232 cmd.num_disc_configs++;
233 }
234
235 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
eb9bc6e9
SO		 236 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
237 &cmd);
6a2968aa
IE		 238}
239
019c4fba
IE		 240struct nci_rf_discover_select_param {
241 __u8 rf_discovery_id;
242 __u8 rf_protocol;
243};
244
245static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
246{
247 struct nci_rf_discover_select_param *param =
eb9bc6e9 248 (struct nci_rf_discover_select_param *)opt;
019c4fba
IE		 249 struct nci_rf_discover_select_cmd cmd;
250
251 cmd.rf_discovery_id = param->rf_discovery_id;
252 cmd.rf_protocol = param->rf_protocol;
253
254 switch (cmd.rf_protocol) {
255 case NCI_RF_PROTOCOL_ISO_DEP:
256 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
257 break;
258
259 case NCI_RF_PROTOCOL_NFC_DEP:
260 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
261 break;
262
263 default:
264 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
265 break;
266 }
267
268 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
eb9bc6e9 269 sizeof(struct nci_rf_discover_select_cmd), &cmd);
019c4fba
IE		 270}
271
6a2968aa
IE		 272static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
273{
274 struct nci_rf_deactivate_cmd cmd;
275
276 cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE;
277
278 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
eb9bc6e9 279 sizeof(struct nci_rf_deactivate_cmd), &cmd);
6a2968aa
IE		 280}
281
282static int nci_open_device(struct nci_dev *ndev)
283{
284 int rc = 0;
285
286 mutex_lock(&ndev->req_lock);
287
288 if (test_bit(NCI_UP, &ndev->flags)) {
289 rc = -EALREADY;
290 goto done;
291 }
292
293 if (ndev->ops->open(ndev)) {
294 rc = -EIO;
295 goto done;
296 }
297
298 atomic_set(&ndev->cmd_cnt, 1);
299
300 set_bit(NCI_INIT, &ndev->flags);
301
302 rc = __nci_request(ndev, nci_reset_req, 0,
eb9bc6e9 303 msecs_to_jiffies(NCI_RESET_TIMEOUT));
6a2968aa
IE		 304
305 if (!rc) {
306 rc = __nci_request(ndev, nci_init_req, 0,
eb9bc6e9 307 msecs_to_jiffies(NCI_INIT_TIMEOUT));
6a2968aa
IE		 308 }
309
310 if (!rc) {
311 rc = __nci_request(ndev, nci_init_complete_req, 0,
eb9bc6e9 312 msecs_to_jiffies(NCI_INIT_TIMEOUT));
6a2968aa
IE		 313 }
314
315 clear_bit(NCI_INIT, &ndev->flags);
316
317 if (!rc) {
318 set_bit(NCI_UP, &ndev->flags);
019c4fba 319 nci_clear_target_list(ndev);
8939e47f 320 atomic_set(&ndev->state, NCI_IDLE);
6a2968aa
IE		 321 } else {
322 /* Init failed, cleanup */
323 skb_queue_purge(&ndev->cmd_q);
324 skb_queue_purge(&ndev->rx_q);
325 skb_queue_purge(&ndev->tx_q);
326
327 ndev->ops->close(ndev);
328 ndev->flags = 0;
329 }
330
331done:
332 mutex_unlock(&ndev->req_lock);
333 return rc;
334}
335
336static int nci_close_device(struct nci_dev *ndev)
337{
338 nci_req_cancel(ndev, ENODEV);
339 mutex_lock(&ndev->req_lock);
340
341 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
342 del_timer_sync(&ndev->cmd_timer);
c4bf98b2 343 del_timer_sync(&ndev->data_timer);
6a2968aa
IE		 344 mutex_unlock(&ndev->req_lock);
345 return 0;
346 }
347
348 /* Drop RX and TX queues */
349 skb_queue_purge(&ndev->rx_q);
350 skb_queue_purge(&ndev->tx_q);
351
352 /* Flush RX and TX wq */
353 flush_workqueue(ndev->rx_wq);
354 flush_workqueue(ndev->tx_wq);
355
356 /* Reset device */
357 skb_queue_purge(&ndev->cmd_q);
358 atomic_set(&ndev->cmd_cnt, 1);
359
360 set_bit(NCI_INIT, &ndev->flags);
361 __nci_request(ndev, nci_reset_req, 0,
eb9bc6e9 362 msecs_to_jiffies(NCI_RESET_TIMEOUT));
6a2968aa
IE		 363 clear_bit(NCI_INIT, &ndev->flags);
364
365 /* Flush cmd wq */
366 flush_workqueue(ndev->cmd_wq);
367
368 /* After this point our queues are empty
369 * and no works are scheduled. */
370 ndev->ops->close(ndev);
371
372 /* Clear flags */
373 ndev->flags = 0;
374
375 mutex_unlock(&ndev->req_lock);
376
377 return 0;
378}
379
380/* NCI command timer function */
381static void nci_cmd_timer(unsigned long arg)
382{
383 struct nci_dev *ndev = (void *) arg;
384
6a2968aa
IE		 385 atomic_set(&ndev->cmd_cnt, 1);
386 queue_work(ndev->cmd_wq, &ndev->cmd_work);
387}
388
c4bf98b2
IE		 389/* NCI data exchange timer function */
390static void nci_data_timer(unsigned long arg)
391{
392 struct nci_dev *ndev = (void *) arg;
393
394 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
395 queue_work(ndev->rx_wq, &ndev->rx_work);
396}
397
6a2968aa
IE		 398static int nci_dev_up(struct nfc_dev *nfc_dev)
399{
400 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
401
6a2968aa
IE		 402 return nci_open_device(ndev);
403}
404
405static int nci_dev_down(struct nfc_dev *nfc_dev)
406{
407 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
408
6a2968aa
IE		 409 return nci_close_device(ndev);
410}
411
7e035230
IE		 412static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
413{
414 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
415 struct nci_set_config_param param;
416 __u8 local_gb[NFC_MAX_GT_LEN];
f9fc36f4 417 int i;
7e035230
IE		 418
419 param.val = nfc_get_local_general_bytes(nfc_dev, &param.len);
420 if ((param.val == NULL) || (param.len == 0))
f9fc36f4 421 return 0;
7e035230 422
460d8f97 423 if (param.len > NFC_MAX_GT_LEN)
7e035230
IE		 424 return -EINVAL;
425
426 for (i = 0; i < param.len; i++)
427 local_gb[param.len-1-i] = param.val[i];
428
429 param.id = NCI_PN_ATR_REQ_GEN_BYTES;
430 param.val = local_gb;
431
f9fc36f4
SJ		 432 return nci_request(ndev, nci_set_config_req, (unsigned long)&param,
433 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
7e035230
IE		 434}
435
fe7c5800
SO		 436static int nci_start_poll(struct nfc_dev *nfc_dev,
437 __u32 im_protocols, __u32 tm_protocols)
6a2968aa
IE		 438{
439 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
440 int rc;
441
019c4fba 442 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
eb9bc6e9 443 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
ed1e0ad8 444 pr_err("unable to start poll, since poll is already active\n");
6a2968aa
IE		 445 return -EBUSY;
446 }
447
de054799 448 if (ndev->target_active_prot) {
ed1e0ad8 449 pr_err("there is an active target\n");
de054799
IE		 450 return -EBUSY;
451 }
452
019c4fba 453 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
eb9bc6e9 454 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
019c4fba 455 pr_debug("target active or w4 select, implicitly deactivate\n");
6a2968aa
IE		 456
457 rc = nci_request(ndev, nci_rf_deactivate_req, 0,
eb9bc6e9 458 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
6a2968aa
IE		 459 if (rc)
460 return -EBUSY;
461 }
462
7e035230
IE		 463 if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
464 rc = nci_set_local_general_bytes(nfc_dev);
465 if (rc) {
466 pr_err("failed to set local general bytes\n");
467 return rc;
468 }
469 }
470
fe7c5800 471 rc = nci_request(ndev, nci_rf_discover_req, im_protocols,
eb9bc6e9 472 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
6a2968aa
IE		 473
474 if (!rc)
fe7c5800 475 ndev->poll_prots = im_protocols;
6a2968aa
IE		 476
477 return rc;
478}
479
480static void nci_stop_poll(struct nfc_dev *nfc_dev)
481{
482 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
483
019c4fba 484 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
eb9bc6e9 485 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
ed1e0ad8 486 pr_err("unable to stop poll, since poll is not active\n");
6a2968aa
IE		 487 return;
488 }
489
490 nci_request(ndev, nci_rf_deactivate_req, 0,
eb9bc6e9 491 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
6a2968aa
IE		 492}
493
90099433
EL		 494static int nci_activate_target(struct nfc_dev *nfc_dev,
495 struct nfc_target *target, __u32 protocol)
6a2968aa
IE		 496{
497 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
019c4fba 498 struct nci_rf_discover_select_param param;
90099433 499 struct nfc_target *nci_target = NULL;
019c4fba
IE		 500 int i;
501 int rc = 0;
6a2968aa 502
90099433 503 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
6a2968aa 504
019c4fba 505 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
eb9bc6e9 506 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
ed1e0ad8 507 pr_err("there is no available target to activate\n");
6a2968aa
IE		 508 return -EINVAL;
509 }
510
511 if (ndev->target_active_prot) {
ed1e0ad8 512 pr_err("there is already an active target\n");
6a2968aa
IE		 513 return -EBUSY;
514 }
515
019c4fba 516 for (i = 0; i < ndev->n_targets; i++) {
90099433
EL		 517 if (ndev->targets[i].idx == target->idx) {
518 nci_target = &ndev->targets[i];
019c4fba
IE		 519 break;
520 }
521 }
522
90099433 523 if (!nci_target) {
019c4fba
IE		 524 pr_err("unable to find the selected target\n");
525 return -EINVAL;
526 }
527
90099433 528 if (!(nci_target->supported_protocols & (1 << protocol))) {
ed1e0ad8
JP		 529 pr_err("target does not support the requested protocol 0x%x\n",
530 protocol);
6a2968aa
IE		 531 return -EINVAL;
532 }
533
019c4fba 534 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
90099433 535 param.rf_discovery_id = nci_target->logical_idx;
019c4fba
IE		 536
537 if (protocol == NFC_PROTO_JEWEL)
538 param.rf_protocol = NCI_RF_PROTOCOL_T1T;
539 else if (protocol == NFC_PROTO_MIFARE)
540 param.rf_protocol = NCI_RF_PROTOCOL_T2T;
541 else if (protocol == NFC_PROTO_FELICA)
542 param.rf_protocol = NCI_RF_PROTOCOL_T3T;
01d719a2
SO		 543 else if (protocol == NFC_PROTO_ISO14443 ||
544 protocol == NFC_PROTO_ISO14443_B)
019c4fba
IE		 545 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
546 else
547 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
548
549 rc = nci_request(ndev, nci_rf_discover_select_req,
eb9bc6e9
SO		 550 (unsigned long)&param,
551 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
019c4fba 552 }
6a2968aa 553
019c4fba
IE		 554 if (!rc)
555 ndev->target_active_prot = protocol;
556
557 return rc;
6a2968aa
IE		 558}
559
90099433
EL		 560static void nci_deactivate_target(struct nfc_dev *nfc_dev,
561 struct nfc_target *target)
6a2968aa
IE		 562{
563 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
564
767f19ae 565 pr_debug("entry\n");
6a2968aa
IE		 566
567 if (!ndev->target_active_prot) {
ed1e0ad8 568 pr_err("unable to deactivate target, no active target\n");
6a2968aa
IE		 569 return;
570 }
571
572 ndev->target_active_prot = 0;
573
8939e47f 574 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
6a2968aa 575 nci_request(ndev, nci_rf_deactivate_req, 0,
eb9bc6e9 576 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
6a2968aa
IE		 577 }
578}
579
767f19ae
IE		 580static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
581 __u8 comm_mode, __u8 *gb, size_t gb_len)
582{
583 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
584 int rc;
585
586 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
587
588 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
589 if (rc)
590 return rc;
591
592 rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
593 ndev->remote_gb_len);
594 if (!rc)
595 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
596 NFC_RF_INITIATOR);
597
598 return rc;
599}
600
601static int nci_dep_link_down(struct nfc_dev *nfc_dev)
602{
603 pr_debug("entry\n");
604
605 nci_deactivate_target(nfc_dev, NULL);
606
607 return 0;
608}
609
610
be9ae4ce
SO		 611static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
612 struct sk_buff *skb,
613 data_exchange_cb_t cb, void *cb_context)
6a2968aa
IE		 614{
615 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
38f04c6b 616 int rc;
6a2968aa 617
90099433 618 pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
6a2968aa
IE		 619
620 if (!ndev->target_active_prot) {
ed1e0ad8 621 pr_err("unable to exchange data, no active target\n");
6a2968aa
IE		 622 return -EINVAL;
623 }
624
38f04c6b
IE		 625 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
626 return -EBUSY;
627
6a2968aa
IE		 628 /* store cb and context to be used on receiving data */
629 ndev->data_exchange_cb = cb;
630 ndev->data_exchange_cb_context = cb_context;
631
e8c0dacd 632 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
38f04c6b
IE		 633 if (rc)
634 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
635
636 return rc;
6a2968aa
IE		 637}
638
639static struct nfc_ops nci_nfc_ops = {
640 .dev_up = nci_dev_up,
641 .dev_down = nci_dev_down,
642 .start_poll = nci_start_poll,
643 .stop_poll = nci_stop_poll,
767f19ae
IE		 644 .dep_link_up = nci_dep_link_up,
645 .dep_link_down = nci_dep_link_down,
6a2968aa
IE		 646 .activate_target = nci_activate_target,
647 .deactivate_target = nci_deactivate_target,
be9ae4ce 648 .im_transceive = nci_transceive,
6a2968aa
IE		 649};
650
651/* ---- Interface to NCI drivers ---- */
652
653/**
654 * nci_allocate_device - allocate a new nci device
655 *
656 * @ops: device operations
657 * @supported_protocols: NFC protocols supported by the device
658 */
659struct nci_dev *nci_allocate_device(struct nci_ops *ops,
eb9bc6e9
SO		 660 __u32 supported_protocols,
661 int tx_headroom, int tx_tailroom)
6a2968aa 662{
8ebafde0 663 struct nci_dev *ndev;
6a2968aa 664
24bf3304 665 pr_debug("supported_protocols 0x%x\n", supported_protocols);
6a2968aa
IE		 666
667 if (!ops->open || !ops->close || !ops->send)
8ebafde0 668 return NULL;
6a2968aa
IE		 669
670 if (!supported_protocols)
8ebafde0 671 return NULL;
6a2968aa
IE		 672
673 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
674 if (!ndev)
8ebafde0 675 return NULL;
6a2968aa
IE		 676
677 ndev->ops = ops;
678 ndev->tx_headroom = tx_headroom;
679 ndev->tx_tailroom = tx_tailroom;
680
681 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
eb9bc6e9
SO		 682 supported_protocols,
683 tx_headroom + NCI_DATA_HDR_SIZE,
684 tx_tailroom);
6a2968aa
IE		 685 if (!ndev->nfc_dev)
686 goto free_exit;
687
688 nfc_set_drvdata(ndev->nfc_dev, ndev);
689
8ebafde0 690 return ndev;
6a2968aa
IE		 691
692free_exit:
693 kfree(ndev);
8ebafde0 694 return NULL;
6a2968aa
IE		 695}
696EXPORT_SYMBOL(nci_allocate_device);
697
698/**
699 * nci_free_device - deallocate nci device
700 *
701 * @ndev: The nci device to deallocate
702 */
703void nci_free_device(struct nci_dev *ndev)
704{
6a2968aa
IE		 705 nfc_free_device(ndev->nfc_dev);
706 kfree(ndev);
707}
708EXPORT_SYMBOL(nci_free_device);
709
710/**
711 * nci_register_device - register a nci device in the nfc subsystem
712 *
713 * @dev: The nci device to register
714 */
715int nci_register_device(struct nci_dev *ndev)
716{
717 int rc;
718 struct device *dev = &ndev->nfc_dev->dev;
719 char name[32];
720
6a2968aa
IE		 721 rc = nfc_register_device(ndev->nfc_dev);
722 if (rc)
723 goto exit;
724
725 ndev->flags = 0;
726
727 INIT_WORK(&ndev->cmd_work, nci_cmd_work);
728 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
729 ndev->cmd_wq = create_singlethread_workqueue(name);
730 if (!ndev->cmd_wq) {
731 rc = -ENOMEM;
732 goto unreg_exit;
733 }
734
735 INIT_WORK(&ndev->rx_work, nci_rx_work);
736 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
737 ndev->rx_wq = create_singlethread_workqueue(name);
738 if (!ndev->rx_wq) {
739 rc = -ENOMEM;
740 goto destroy_cmd_wq_exit;
741 }
742
743 INIT_WORK(&ndev->tx_work, nci_tx_work);
744 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
745 ndev->tx_wq = create_singlethread_workqueue(name);
746 if (!ndev->tx_wq) {
747 rc = -ENOMEM;
748 goto destroy_rx_wq_exit;
749 }
750
751 skb_queue_head_init(&ndev->cmd_q);
752 skb_queue_head_init(&ndev->rx_q);
753 skb_queue_head_init(&ndev->tx_q);
754
755 setup_timer(&ndev->cmd_timer, nci_cmd_timer,
eb9bc6e9 756 (unsigned long) ndev);
c4bf98b2 757 setup_timer(&ndev->data_timer, nci_data_timer,
eb9bc6e9 758 (unsigned long) ndev);
6a2968aa
IE		 759
760 mutex_init(&ndev->req_lock);
761
762 goto exit;
763
764destroy_rx_wq_exit:
765 destroy_workqueue(ndev->rx_wq);
766
767destroy_cmd_wq_exit:
768 destroy_workqueue(ndev->cmd_wq);
769
770unreg_exit:
771 nfc_unregister_device(ndev->nfc_dev);
772
773exit:
774 return rc;
775}
776EXPORT_SYMBOL(nci_register_device);
777
778/**
779 * nci_unregister_device - unregister a nci device in the nfc subsystem
780 *
781 * @dev: The nci device to unregister
782 */
783void nci_unregister_device(struct nci_dev *ndev)
784{
6a2968aa
IE		 785 nci_close_device(ndev);
786
787 destroy_workqueue(ndev->cmd_wq);
788 destroy_workqueue(ndev->rx_wq);
789 destroy_workqueue(ndev->tx_wq);
790
791 nfc_unregister_device(ndev->nfc_dev);
792}
793EXPORT_SYMBOL(nci_unregister_device);
794
795/**
796 * nci_recv_frame - receive frame from NCI drivers
797 *
1095e69f 798 * @ndev: The nci device
6a2968aa
IE		 799 * @skb: The sk_buff to receive
800 */
1095e69f 801int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
6a2968aa 802{
24bf3304 803 pr_debug("len %d\n", skb->len);
6a2968aa 804
874934f4
SJ		 805 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
806 !test_bit(NCI_INIT, &ndev->flags))) {
6a2968aa
IE		 807 kfree_skb(skb);
808 return -ENXIO;
809 }
810
811 /* Queue frame for rx worker thread */
812 skb_queue_tail(&ndev->rx_q, skb);
813 queue_work(ndev->rx_wq, &ndev->rx_work);
814
815 return 0;
816}
817EXPORT_SYMBOL(nci_recv_frame);
818
1095e69f 819static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
6a2968aa 820{
24bf3304 821 pr_debug("len %d\n", skb->len);
6a2968aa
IE		 822
823 if (!ndev) {
824 kfree_skb(skb);
825 return -ENODEV;
826 }
827
828 /* Get rid of skb owner, prior to sending to the driver. */
829 skb_orphan(skb);
830
1095e69f 831 return ndev->ops->send(ndev, skb);
6a2968aa
IE		 832}
833
834/* Send NCI command */
835int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
836{
837 struct nci_ctrl_hdr *hdr;
838 struct sk_buff *skb;
839
24bf3304 840 pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
6a2968aa
IE		 841
842 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
843 if (!skb) {
ed1e0ad8 844 pr_err("no memory for command\n");
6a2968aa
IE		 845 return -ENOMEM;
846 }
847
848 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
849 hdr->gid = nci_opcode_gid(opcode);
850 hdr->oid = nci_opcode_oid(opcode);
851 hdr->plen = plen;
852
853 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
854 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
855
856 if (plen)
857 memcpy(skb_put(skb, plen), payload, plen);
858
6a2968aa
IE		 859 skb_queue_tail(&ndev->cmd_q, skb);
860 queue_work(ndev->cmd_wq, &ndev->cmd_work);
861
862 return 0;
863}
864
865/* ---- NCI TX Data worker thread ---- */
866
867static void nci_tx_work(struct work_struct *work)
868{
869 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
870 struct sk_buff *skb;
871
24bf3304 872 pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt));
6a2968aa
IE		 873
874 /* Send queued tx data */
875 while (atomic_read(&ndev->credits_cnt)) {
876 skb = skb_dequeue(&ndev->tx_q);
877 if (!skb)
878 return;
879
db98c829
IE		 880 /* Check if data flow control is used */
881 if (atomic_read(&ndev->credits_cnt) !=
eb9bc6e9 882 NCI_DATA_FLOW_CONTROL_NOT_USED)
db98c829 883 atomic_dec(&ndev->credits_cnt);
6a2968aa 884
20c239c1
JP		 885 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
886 nci_pbf(skb->data),
887 nci_conn_id(skb->data),
888 nci_plen(skb->data));
6a2968aa 889
1095e69f 890 nci_send_frame(ndev, skb);
c4bf98b2
IE		 891
892 mod_timer(&ndev->data_timer,
eb9bc6e9 893 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
6a2968aa
IE		 894 }
895}
896
897/* ----- NCI RX worker thread (data & control) ----- */
898
899static void nci_rx_work(struct work_struct *work)
900{
901 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
902 struct sk_buff *skb;
903
904 while ((skb = skb_dequeue(&ndev->rx_q))) {
905 /* Process frame */
906 switch (nci_mt(skb->data)) {
907 case NCI_MT_RSP_PKT:
908 nci_rsp_packet(ndev, skb);
909 break;
910
911 case NCI_MT_NTF_PKT:
912 nci_ntf_packet(ndev, skb);
913 break;
914
915 case NCI_MT_DATA_PKT:
916 nci_rx_data_packet(ndev, skb);
917 break;
918
919 default:
ed1e0ad8 920 pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
6a2968aa
IE		 921 kfree_skb(skb);
922 break;
923 }
924 }
c4bf98b2
IE		 925
926 /* check if a data exchange timout has occurred */
927 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
928 /* complete the data exchange transaction, if exists */
929 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
930 nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT);
931
932 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
933 }
6a2968aa
IE		 934}
935
936/* ----- NCI TX CMD worker thread ----- */
937
938static void nci_cmd_work(struct work_struct *work)
939{
940 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
941 struct sk_buff *skb;
942
24bf3304 943 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
6a2968aa
IE		 944
945 /* Send queued command */
946 if (atomic_read(&ndev->cmd_cnt)) {
947 skb = skb_dequeue(&ndev->cmd_q);
948 if (!skb)
949 return;
950
951 atomic_dec(&ndev->cmd_cnt);
952
20c239c1
JP		 953 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
954 nci_pbf(skb->data),
955 nci_opcode_gid(nci_opcode(skb->data)),
956 nci_opcode_oid(nci_opcode(skb->data)),
957 nci_plen(skb->data));
6a2968aa 958
1095e69f 959 nci_send_frame(ndev, skb);
6a2968aa
IE		 960
961 mod_timer(&ndev->cmd_timer,
eb9bc6e9 962 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
6a2968aa
IE		 963 }
964}
8a70e7f8
DJ		 965
966MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)