2 * The NFC Controller Interface is the communication protocol between an
3 * NFC Controller (NFCC) and a Device Host (DH).
5 * Copyright (C) 2011 Texas Instruments, Inc.
7 * Written by Ilan Elias <ilane@ti.com>
10 * This file is based on hci_core.c, which was written
11 * by Maxim Krasnyansky.
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
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.
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
28 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
30 #include <linux/types.h>
31 #include <linux/workqueue.h>
32 #include <linux/completion.h>
33 #include <linux/export.h>
34 #include <linux/sched.h>
35 #include <linux/bitops.h>
36 #include <linux/skbuff.h>
39 #include <net/nfc/nci.h>
40 #include <net/nfc/nci_core.h>
41 #include <linux/nfc.h>
43 static void nci_cmd_work(struct work_struct *work);
44 static void nci_rx_work(struct work_struct *work);
45 static void nci_tx_work(struct work_struct *work);
47 /* ---- NCI requests ---- */
49 void nci_req_complete(struct nci_dev *ndev, int result)
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);
58 static void nci_req_cancel(struct nci_dev *ndev, int err)
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);
67 /* Execute request and wait for completion. */
68 static int __nci_request(struct nci_dev *ndev,
69 void (*req)(struct nci_dev *ndev, unsigned long opt),
70 unsigned long opt, __u32 timeout)
75 ndev->req_status = NCI_REQ_PEND;
77 init_completion(&ndev->req_completion);
80 wait_for_completion_interruptible_timeout(&ndev->req_completion,
83 pr_debug("wait_for_completion return %ld\n", completion_rc);
85 if (completion_rc > 0) {
86 switch (ndev->req_status) {
88 rc = nci_to_errno(ndev->req_result);
91 case NCI_REQ_CANCELED:
92 rc = -ndev->req_result;
100 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
103 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
106 ndev->req_status = ndev->req_result = 0;
111 static inline int nci_request(struct nci_dev *ndev,
112 void (*req)(struct nci_dev *ndev,
114 unsigned long opt, __u32 timeout)
118 if (!test_bit(NCI_UP, &ndev->flags))
121 /* Serialize all requests */
122 mutex_lock(&ndev->req_lock);
123 rc = __nci_request(ndev, req, opt, timeout);
124 mutex_unlock(&ndev->req_lock);
129 static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
131 struct nci_core_reset_cmd cmd;
133 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
134 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
137 static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
139 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
142 static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
144 struct nci_rf_disc_map_cmd cmd;
145 struct disc_map_config *cfg = cmd.mapping_configs;
146 __u8 *num = &cmd.num_mapping_configs;
149 /* set rf mapping configurations */
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] ==
155 NCI_RF_INTERFACE_ISO_DEP) {
156 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
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;
161 } else if (ndev->supported_rf_interfaces[i] ==
162 NCI_RF_INTERFACE_NFC_DEP) {
163 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
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;
170 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
174 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
175 (1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
178 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
180 struct nci_rf_disc_cmd cmd;
181 __u32 protocols = opt;
183 cmd.num_disc_configs = 0;
185 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
186 (protocols & NFC_PROTO_JEWEL_MASK
187 || protocols & NFC_PROTO_MIFARE_MASK
188 || protocols & NFC_PROTO_ISO14443_MASK
189 || protocols & NFC_PROTO_NFC_DEP_MASK)) {
190 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
191 NCI_NFC_A_PASSIVE_POLL_MODE;
192 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
193 cmd.num_disc_configs++;
196 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
197 (protocols & NFC_PROTO_ISO14443_MASK)) {
198 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
199 NCI_NFC_B_PASSIVE_POLL_MODE;
200 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
201 cmd.num_disc_configs++;
204 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
205 (protocols & NFC_PROTO_FELICA_MASK
206 || protocols & NFC_PROTO_NFC_DEP_MASK)) {
207 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
208 NCI_NFC_F_PASSIVE_POLL_MODE;
209 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
210 cmd.num_disc_configs++;
213 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
214 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
218 struct nci_rf_discover_select_param {
219 __u8 rf_discovery_id;
223 static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
225 struct nci_rf_discover_select_param *param =
226 (struct nci_rf_discover_select_param *)opt;
227 struct nci_rf_discover_select_cmd cmd;
229 cmd.rf_discovery_id = param->rf_discovery_id;
230 cmd.rf_protocol = param->rf_protocol;
232 switch (cmd.rf_protocol) {
233 case NCI_RF_PROTOCOL_ISO_DEP:
234 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
237 case NCI_RF_PROTOCOL_NFC_DEP:
238 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
242 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
246 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
247 sizeof(struct nci_rf_discover_select_cmd), &cmd);
250 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
252 struct nci_rf_deactivate_cmd cmd;
254 cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE;
256 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
257 sizeof(struct nci_rf_deactivate_cmd), &cmd);
260 static int nci_open_device(struct nci_dev *ndev)
264 mutex_lock(&ndev->req_lock);
266 if (test_bit(NCI_UP, &ndev->flags)) {
271 if (ndev->ops->open(ndev)) {
276 atomic_set(&ndev->cmd_cnt, 1);
278 set_bit(NCI_INIT, &ndev->flags);
280 rc = __nci_request(ndev, nci_reset_req, 0,
281 msecs_to_jiffies(NCI_RESET_TIMEOUT));
284 rc = __nci_request(ndev, nci_init_req, 0,
285 msecs_to_jiffies(NCI_INIT_TIMEOUT));
289 rc = __nci_request(ndev, nci_init_complete_req, 0,
290 msecs_to_jiffies(NCI_INIT_TIMEOUT));
293 clear_bit(NCI_INIT, &ndev->flags);
296 set_bit(NCI_UP, &ndev->flags);
297 nci_clear_target_list(ndev);
298 atomic_set(&ndev->state, NCI_IDLE);
300 /* Init failed, cleanup */
301 skb_queue_purge(&ndev->cmd_q);
302 skb_queue_purge(&ndev->rx_q);
303 skb_queue_purge(&ndev->tx_q);
305 ndev->ops->close(ndev);
310 mutex_unlock(&ndev->req_lock);
314 static int nci_close_device(struct nci_dev *ndev)
316 nci_req_cancel(ndev, ENODEV);
317 mutex_lock(&ndev->req_lock);
319 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
320 del_timer_sync(&ndev->cmd_timer);
321 del_timer_sync(&ndev->data_timer);
322 mutex_unlock(&ndev->req_lock);
326 /* Drop RX and TX queues */
327 skb_queue_purge(&ndev->rx_q);
328 skb_queue_purge(&ndev->tx_q);
330 /* Flush RX and TX wq */
331 flush_workqueue(ndev->rx_wq);
332 flush_workqueue(ndev->tx_wq);
335 skb_queue_purge(&ndev->cmd_q);
336 atomic_set(&ndev->cmd_cnt, 1);
338 set_bit(NCI_INIT, &ndev->flags);
339 __nci_request(ndev, nci_reset_req, 0,
340 msecs_to_jiffies(NCI_RESET_TIMEOUT));
341 clear_bit(NCI_INIT, &ndev->flags);
344 flush_workqueue(ndev->cmd_wq);
346 /* After this point our queues are empty
347 * and no works are scheduled. */
348 ndev->ops->close(ndev);
353 mutex_unlock(&ndev->req_lock);
358 /* NCI command timer function */
359 static void nci_cmd_timer(unsigned long arg)
361 struct nci_dev *ndev = (void *) arg;
363 atomic_set(&ndev->cmd_cnt, 1);
364 queue_work(ndev->cmd_wq, &ndev->cmd_work);
367 /* NCI data exchange timer function */
368 static void nci_data_timer(unsigned long arg)
370 struct nci_dev *ndev = (void *) arg;
372 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
373 queue_work(ndev->rx_wq, &ndev->rx_work);
376 static int nci_dev_up(struct nfc_dev *nfc_dev)
378 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
380 return nci_open_device(ndev);
383 static int nci_dev_down(struct nfc_dev *nfc_dev)
385 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
387 return nci_close_device(ndev);
390 static int nci_start_poll(struct nfc_dev *nfc_dev, __u32 protocols)
392 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
395 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
396 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
397 pr_err("unable to start poll, since poll is already active\n");
401 if (ndev->target_active_prot) {
402 pr_err("there is an active target\n");
406 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
407 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
408 pr_debug("target active or w4 select, implicitly deactivate\n");
410 rc = nci_request(ndev, nci_rf_deactivate_req, 0,
411 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
416 rc = nci_request(ndev, nci_rf_discover_req, protocols,
417 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
420 ndev->poll_prots = protocols;
425 static void nci_stop_poll(struct nfc_dev *nfc_dev)
427 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
429 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
430 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
431 pr_err("unable to stop poll, since poll is not active\n");
435 nci_request(ndev, nci_rf_deactivate_req, 0,
436 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
439 static int nci_activate_target(struct nfc_dev *nfc_dev,
440 struct nfc_target *target, __u32 protocol)
442 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
443 struct nci_rf_discover_select_param param;
444 struct nfc_target *nci_target = NULL;
448 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
450 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
451 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
452 pr_err("there is no available target to activate\n");
456 if (ndev->target_active_prot) {
457 pr_err("there is already an active target\n");
461 for (i = 0; i < ndev->n_targets; i++) {
462 if (ndev->targets[i].idx == target->idx) {
463 nci_target = &ndev->targets[i];
469 pr_err("unable to find the selected target\n");
473 if (!(nci_target->supported_protocols & (1 << protocol))) {
474 pr_err("target does not support the requested protocol 0x%x\n",
479 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
480 param.rf_discovery_id = nci_target->logical_idx;
482 if (protocol == NFC_PROTO_JEWEL)
483 param.rf_protocol = NCI_RF_PROTOCOL_T1T;
484 else if (protocol == NFC_PROTO_MIFARE)
485 param.rf_protocol = NCI_RF_PROTOCOL_T2T;
486 else if (protocol == NFC_PROTO_FELICA)
487 param.rf_protocol = NCI_RF_PROTOCOL_T3T;
488 else if (protocol == NFC_PROTO_ISO14443)
489 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
491 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
493 rc = nci_request(ndev, nci_rf_discover_select_req,
494 (unsigned long)¶m,
495 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
499 ndev->target_active_prot = protocol;
504 static void nci_deactivate_target(struct nfc_dev *nfc_dev,
505 struct nfc_target *target)
507 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
509 pr_debug("target_idx %d\n", target->idx);
511 if (!ndev->target_active_prot) {
512 pr_err("unable to deactivate target, no active target\n");
516 ndev->target_active_prot = 0;
518 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
519 nci_request(ndev, nci_rf_deactivate_req, 0,
520 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
524 static int nci_data_exchange(struct nfc_dev *nfc_dev, struct nfc_target *target,
526 data_exchange_cb_t cb, void *cb_context)
528 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
531 pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
533 if (!ndev->target_active_prot) {
534 pr_err("unable to exchange data, no active target\n");
538 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
541 /* store cb and context to be used on receiving data */
542 ndev->data_exchange_cb = cb;
543 ndev->data_exchange_cb_context = cb_context;
545 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
547 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
552 static struct nfc_ops nci_nfc_ops = {
553 .dev_up = nci_dev_up,
554 .dev_down = nci_dev_down,
555 .start_poll = nci_start_poll,
556 .stop_poll = nci_stop_poll,
557 .activate_target = nci_activate_target,
558 .deactivate_target = nci_deactivate_target,
559 .data_exchange = nci_data_exchange,
562 /* ---- Interface to NCI drivers ---- */
565 * nci_allocate_device - allocate a new nci device
567 * @ops: device operations
568 * @supported_protocols: NFC protocols supported by the device
570 struct nci_dev *nci_allocate_device(struct nci_ops *ops,
571 __u32 supported_protocols,
572 int tx_headroom, int tx_tailroom)
574 struct nci_dev *ndev;
576 pr_debug("supported_protocols 0x%x\n", supported_protocols);
578 if (!ops->open || !ops->close || !ops->send)
581 if (!supported_protocols)
584 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
589 ndev->tx_headroom = tx_headroom;
590 ndev->tx_tailroom = tx_tailroom;
592 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
594 tx_headroom + NCI_DATA_HDR_SIZE,
599 nfc_set_drvdata(ndev->nfc_dev, ndev);
607 EXPORT_SYMBOL(nci_allocate_device);
610 * nci_free_device - deallocate nci device
612 * @ndev: The nci device to deallocate
614 void nci_free_device(struct nci_dev *ndev)
616 nfc_free_device(ndev->nfc_dev);
619 EXPORT_SYMBOL(nci_free_device);
622 * nci_register_device - register a nci device in the nfc subsystem
624 * @dev: The nci device to register
626 int nci_register_device(struct nci_dev *ndev)
629 struct device *dev = &ndev->nfc_dev->dev;
632 rc = nfc_register_device(ndev->nfc_dev);
638 INIT_WORK(&ndev->cmd_work, nci_cmd_work);
639 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
640 ndev->cmd_wq = create_singlethread_workqueue(name);
646 INIT_WORK(&ndev->rx_work, nci_rx_work);
647 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
648 ndev->rx_wq = create_singlethread_workqueue(name);
651 goto destroy_cmd_wq_exit;
654 INIT_WORK(&ndev->tx_work, nci_tx_work);
655 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
656 ndev->tx_wq = create_singlethread_workqueue(name);
659 goto destroy_rx_wq_exit;
662 skb_queue_head_init(&ndev->cmd_q);
663 skb_queue_head_init(&ndev->rx_q);
664 skb_queue_head_init(&ndev->tx_q);
666 setup_timer(&ndev->cmd_timer, nci_cmd_timer,
667 (unsigned long) ndev);
668 setup_timer(&ndev->data_timer, nci_data_timer,
669 (unsigned long) ndev);
671 mutex_init(&ndev->req_lock);
676 destroy_workqueue(ndev->rx_wq);
679 destroy_workqueue(ndev->cmd_wq);
682 nfc_unregister_device(ndev->nfc_dev);
687 EXPORT_SYMBOL(nci_register_device);
690 * nci_unregister_device - unregister a nci device in the nfc subsystem
692 * @dev: The nci device to unregister
694 void nci_unregister_device(struct nci_dev *ndev)
696 nci_close_device(ndev);
698 destroy_workqueue(ndev->cmd_wq);
699 destroy_workqueue(ndev->rx_wq);
700 destroy_workqueue(ndev->tx_wq);
702 nfc_unregister_device(ndev->nfc_dev);
704 EXPORT_SYMBOL(nci_unregister_device);
707 * nci_recv_frame - receive frame from NCI drivers
709 * @skb: The sk_buff to receive
711 int nci_recv_frame(struct sk_buff *skb)
713 struct nci_dev *ndev = (struct nci_dev *) skb->dev;
715 pr_debug("len %d\n", skb->len);
717 if (!ndev || (!test_bit(NCI_UP, &ndev->flags)
718 && !test_bit(NCI_INIT, &ndev->flags))) {
723 /* Queue frame for rx worker thread */
724 skb_queue_tail(&ndev->rx_q, skb);
725 queue_work(ndev->rx_wq, &ndev->rx_work);
729 EXPORT_SYMBOL(nci_recv_frame);
731 static int nci_send_frame(struct sk_buff *skb)
733 struct nci_dev *ndev = (struct nci_dev *) skb->dev;
735 pr_debug("len %d\n", skb->len);
742 /* Get rid of skb owner, prior to sending to the driver. */
745 return ndev->ops->send(skb);
748 /* Send NCI command */
749 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
751 struct nci_ctrl_hdr *hdr;
754 pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
756 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
758 pr_err("no memory for command\n");
762 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
763 hdr->gid = nci_opcode_gid(opcode);
764 hdr->oid = nci_opcode_oid(opcode);
767 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
768 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
771 memcpy(skb_put(skb, plen), payload, plen);
773 skb->dev = (void *) ndev;
775 skb_queue_tail(&ndev->cmd_q, skb);
776 queue_work(ndev->cmd_wq, &ndev->cmd_work);
781 /* ---- NCI TX Data worker thread ---- */
783 static void nci_tx_work(struct work_struct *work)
785 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
788 pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt));
790 /* Send queued tx data */
791 while (atomic_read(&ndev->credits_cnt)) {
792 skb = skb_dequeue(&ndev->tx_q);
796 /* Check if data flow control is used */
797 if (atomic_read(&ndev->credits_cnt) !=
798 NCI_DATA_FLOW_CONTROL_NOT_USED)
799 atomic_dec(&ndev->credits_cnt);
801 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
803 nci_conn_id(skb->data),
804 nci_plen(skb->data));
808 mod_timer(&ndev->data_timer,
809 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
813 /* ----- NCI RX worker thread (data & control) ----- */
815 static void nci_rx_work(struct work_struct *work)
817 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
820 while ((skb = skb_dequeue(&ndev->rx_q))) {
822 switch (nci_mt(skb->data)) {
824 nci_rsp_packet(ndev, skb);
828 nci_ntf_packet(ndev, skb);
831 case NCI_MT_DATA_PKT:
832 nci_rx_data_packet(ndev, skb);
836 pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
842 /* check if a data exchange timout has occurred */
843 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
844 /* complete the data exchange transaction, if exists */
845 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
846 nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT);
848 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
852 /* ----- NCI TX CMD worker thread ----- */
854 static void nci_cmd_work(struct work_struct *work)
856 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
859 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
861 /* Send queued command */
862 if (atomic_read(&ndev->cmd_cnt)) {
863 skb = skb_dequeue(&ndev->cmd_q);
867 atomic_dec(&ndev->cmd_cnt);
869 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
871 nci_opcode_gid(nci_opcode(skb->data)),
872 nci_opcode_oid(nci_opcode(skb->data)),
873 nci_plen(skb->data));
877 mod_timer(&ndev->cmd_timer,
878 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));