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.
6 * Copyright (C) 2014 Marvell International Ltd.
8 * Written by Ilan Elias <ilane@ti.com>
11 * This file is based on hci_core.c, which was written
12 * by Maxim Krasnyansky.
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2
16 * as published by the Free Software Foundation
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, see <http://www.gnu.org/licenses/>.
28 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
30 #include <linux/module.h>
31 #include <linux/types.h>
32 #include <linux/workqueue.h>
33 #include <linux/completion.h>
34 #include <linux/export.h>
35 #include <linux/sched.h>
36 #include <linux/bitops.h>
37 #include <linux/skbuff.h>
40 #include <net/nfc/nci.h>
41 #include <net/nfc/nci_core.h>
42 #include <linux/nfc.h>
44 static void nci_cmd_work(struct work_struct *work);
45 static void nci_rx_work(struct work_struct *work);
46 static void nci_tx_work(struct work_struct *work);
48 /* ---- NCI requests ---- */
50 void nci_req_complete(struct nci_dev *ndev, int result)
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);
59 static void nci_req_cancel(struct nci_dev *ndev, int err)
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);
68 /* Execute request and wait for completion. */
69 static int __nci_request(struct nci_dev *ndev,
70 void (*req)(struct nci_dev *ndev, unsigned long opt),
71 unsigned long opt, __u32 timeout)
76 ndev->req_status = NCI_REQ_PEND;
78 reinit_completion(&ndev->req_completion);
81 wait_for_completion_interruptible_timeout(&ndev->req_completion,
84 pr_debug("wait_for_completion return %ld\n", completion_rc);
86 if (completion_rc > 0) {
87 switch (ndev->req_status) {
89 rc = nci_to_errno(ndev->req_result);
92 case NCI_REQ_CANCELED:
93 rc = -ndev->req_result;
101 pr_err("wait_for_completion_interruptible_timeout failed %ld\n",
104 rc = ((completion_rc == 0) ? (-ETIMEDOUT) : (completion_rc));
107 ndev->req_status = ndev->req_result = 0;
112 static inline int nci_request(struct nci_dev *ndev,
113 void (*req)(struct nci_dev *ndev,
115 unsigned long opt, __u32 timeout)
119 if (!test_bit(NCI_UP, &ndev->flags))
122 /* Serialize all requests */
123 mutex_lock(&ndev->req_lock);
124 rc = __nci_request(ndev, req, opt, timeout);
125 mutex_unlock(&ndev->req_lock);
130 static void nci_reset_req(struct nci_dev *ndev, unsigned long opt)
132 struct nci_core_reset_cmd cmd;
134 cmd.reset_type = NCI_RESET_TYPE_RESET_CONFIG;
135 nci_send_cmd(ndev, NCI_OP_CORE_RESET_CMD, 1, &cmd);
138 static void nci_init_req(struct nci_dev *ndev, unsigned long opt)
140 nci_send_cmd(ndev, NCI_OP_CORE_INIT_CMD, 0, NULL);
143 static void nci_init_complete_req(struct nci_dev *ndev, unsigned long opt)
145 struct nci_rf_disc_map_cmd cmd;
146 struct disc_map_config *cfg = cmd.mapping_configs;
147 __u8 *num = &cmd.num_mapping_configs;
150 /* set rf mapping configurations */
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] ==
156 NCI_RF_INTERFACE_ISO_DEP) {
157 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
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;
162 } else if (ndev->supported_rf_interfaces[i] ==
163 NCI_RF_INTERFACE_NFC_DEP) {
164 cfg[*num].rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
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;
171 if (*num == NCI_MAX_NUM_MAPPING_CONFIGS)
175 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_MAP_CMD,
176 (1 + ((*num) * sizeof(struct disc_map_config))), &cmd);
179 struct nci_set_config_param {
185 static void nci_set_config_req(struct nci_dev *ndev, unsigned long opt)
187 struct nci_set_config_param *param = (struct nci_set_config_param *)opt;
188 struct nci_core_set_config_cmd cmd;
190 BUG_ON(param->len > NCI_MAX_PARAM_LEN);
193 cmd.param.id = param->id;
194 cmd.param.len = param->len;
195 memcpy(cmd.param.val, param->val, param->len);
197 nci_send_cmd(ndev, NCI_OP_CORE_SET_CONFIG_CMD, (3 + param->len), &cmd);
200 struct nci_rf_discover_param {
205 static void nci_rf_discover_req(struct nci_dev *ndev, unsigned long opt)
207 struct nci_rf_discover_param *param =
208 (struct nci_rf_discover_param *)opt;
209 struct nci_rf_disc_cmd cmd;
211 cmd.num_disc_configs = 0;
213 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
214 (param->im_protocols & NFC_PROTO_JEWEL_MASK ||
215 param->im_protocols & NFC_PROTO_MIFARE_MASK ||
216 param->im_protocols & NFC_PROTO_ISO14443_MASK ||
217 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
218 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
219 NCI_NFC_A_PASSIVE_POLL_MODE;
220 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
221 cmd.num_disc_configs++;
224 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
225 (param->im_protocols & NFC_PROTO_ISO14443_B_MASK)) {
226 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
227 NCI_NFC_B_PASSIVE_POLL_MODE;
228 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
229 cmd.num_disc_configs++;
232 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
233 (param->im_protocols & NFC_PROTO_FELICA_MASK ||
234 param->im_protocols & NFC_PROTO_NFC_DEP_MASK)) {
235 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
236 NCI_NFC_F_PASSIVE_POLL_MODE;
237 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
238 cmd.num_disc_configs++;
241 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS) &&
242 (param->im_protocols & NFC_PROTO_ISO15693_MASK)) {
243 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
244 NCI_NFC_V_PASSIVE_POLL_MODE;
245 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
246 cmd.num_disc_configs++;
249 if ((cmd.num_disc_configs < NCI_MAX_NUM_RF_CONFIGS - 1) &&
250 (param->tm_protocols & NFC_PROTO_NFC_DEP_MASK)) {
251 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
252 NCI_NFC_A_PASSIVE_LISTEN_MODE;
253 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
254 cmd.num_disc_configs++;
255 cmd.disc_configs[cmd.num_disc_configs].rf_tech_and_mode =
256 NCI_NFC_F_PASSIVE_LISTEN_MODE;
257 cmd.disc_configs[cmd.num_disc_configs].frequency = 1;
258 cmd.num_disc_configs++;
261 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_CMD,
262 (1 + (cmd.num_disc_configs * sizeof(struct disc_config))),
266 struct nci_rf_discover_select_param {
267 __u8 rf_discovery_id;
271 static void nci_rf_discover_select_req(struct nci_dev *ndev, unsigned long opt)
273 struct nci_rf_discover_select_param *param =
274 (struct nci_rf_discover_select_param *)opt;
275 struct nci_rf_discover_select_cmd cmd;
277 cmd.rf_discovery_id = param->rf_discovery_id;
278 cmd.rf_protocol = param->rf_protocol;
280 switch (cmd.rf_protocol) {
281 case NCI_RF_PROTOCOL_ISO_DEP:
282 cmd.rf_interface = NCI_RF_INTERFACE_ISO_DEP;
285 case NCI_RF_PROTOCOL_NFC_DEP:
286 cmd.rf_interface = NCI_RF_INTERFACE_NFC_DEP;
290 cmd.rf_interface = NCI_RF_INTERFACE_FRAME;
294 nci_send_cmd(ndev, NCI_OP_RF_DISCOVER_SELECT_CMD,
295 sizeof(struct nci_rf_discover_select_cmd), &cmd);
298 static void nci_rf_deactivate_req(struct nci_dev *ndev, unsigned long opt)
300 struct nci_rf_deactivate_cmd cmd;
302 cmd.type = NCI_DEACTIVATE_TYPE_IDLE_MODE;
304 nci_send_cmd(ndev, NCI_OP_RF_DEACTIVATE_CMD,
305 sizeof(struct nci_rf_deactivate_cmd), &cmd);
308 static int nci_open_device(struct nci_dev *ndev)
312 mutex_lock(&ndev->req_lock);
314 if (test_bit(NCI_UP, &ndev->flags)) {
319 if (ndev->ops->open(ndev)) {
324 atomic_set(&ndev->cmd_cnt, 1);
326 set_bit(NCI_INIT, &ndev->flags);
328 rc = __nci_request(ndev, nci_reset_req, 0,
329 msecs_to_jiffies(NCI_RESET_TIMEOUT));
331 if (ndev->ops->setup)
332 ndev->ops->setup(ndev);
335 rc = __nci_request(ndev, nci_init_req, 0,
336 msecs_to_jiffies(NCI_INIT_TIMEOUT));
340 rc = __nci_request(ndev, nci_init_complete_req, 0,
341 msecs_to_jiffies(NCI_INIT_TIMEOUT));
344 clear_bit(NCI_INIT, &ndev->flags);
347 set_bit(NCI_UP, &ndev->flags);
348 nci_clear_target_list(ndev);
349 atomic_set(&ndev->state, NCI_IDLE);
351 /* Init failed, cleanup */
352 skb_queue_purge(&ndev->cmd_q);
353 skb_queue_purge(&ndev->rx_q);
354 skb_queue_purge(&ndev->tx_q);
356 ndev->ops->close(ndev);
361 mutex_unlock(&ndev->req_lock);
365 static int nci_close_device(struct nci_dev *ndev)
367 nci_req_cancel(ndev, ENODEV);
368 mutex_lock(&ndev->req_lock);
370 if (!test_and_clear_bit(NCI_UP, &ndev->flags)) {
371 del_timer_sync(&ndev->cmd_timer);
372 del_timer_sync(&ndev->data_timer);
373 mutex_unlock(&ndev->req_lock);
377 /* Drop RX and TX queues */
378 skb_queue_purge(&ndev->rx_q);
379 skb_queue_purge(&ndev->tx_q);
381 /* Flush RX and TX wq */
382 flush_workqueue(ndev->rx_wq);
383 flush_workqueue(ndev->tx_wq);
386 skb_queue_purge(&ndev->cmd_q);
387 atomic_set(&ndev->cmd_cnt, 1);
389 set_bit(NCI_INIT, &ndev->flags);
390 __nci_request(ndev, nci_reset_req, 0,
391 msecs_to_jiffies(NCI_RESET_TIMEOUT));
392 clear_bit(NCI_INIT, &ndev->flags);
394 del_timer_sync(&ndev->cmd_timer);
397 flush_workqueue(ndev->cmd_wq);
399 /* After this point our queues are empty
400 * and no works are scheduled. */
401 ndev->ops->close(ndev);
406 mutex_unlock(&ndev->req_lock);
411 /* NCI command timer function */
412 static void nci_cmd_timer(unsigned long arg)
414 struct nci_dev *ndev = (void *) arg;
416 atomic_set(&ndev->cmd_cnt, 1);
417 queue_work(ndev->cmd_wq, &ndev->cmd_work);
420 /* NCI data exchange timer function */
421 static void nci_data_timer(unsigned long arg)
423 struct nci_dev *ndev = (void *) arg;
425 set_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
426 queue_work(ndev->rx_wq, &ndev->rx_work);
429 static int nci_dev_up(struct nfc_dev *nfc_dev)
431 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
433 return nci_open_device(ndev);
436 static int nci_dev_down(struct nfc_dev *nfc_dev)
438 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
440 return nci_close_device(ndev);
443 int nci_set_config(struct nci_dev *ndev, __u8 id, size_t len, __u8 *val)
445 struct nci_set_config_param param;
454 return __nci_request(ndev, nci_set_config_req, (unsigned long)¶m,
455 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
457 EXPORT_SYMBOL(nci_set_config);
459 static int nci_set_local_general_bytes(struct nfc_dev *nfc_dev)
461 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
462 struct nci_set_config_param param;
465 param.val = nfc_get_local_general_bytes(nfc_dev, ¶m.len);
466 if ((param.val == NULL) || (param.len == 0))
469 if (param.len > NFC_MAX_GT_LEN)
472 param.id = NCI_PN_ATR_REQ_GEN_BYTES;
474 rc = nci_request(ndev, nci_set_config_req, (unsigned long)¶m,
475 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
479 param.id = NCI_LN_ATR_RES_GEN_BYTES;
481 return nci_request(ndev, nci_set_config_req, (unsigned long)¶m,
482 msecs_to_jiffies(NCI_SET_CONFIG_TIMEOUT));
485 static int nci_set_listen_parameters(struct nfc_dev *nfc_dev)
487 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
491 val = NCI_LA_SEL_INFO_NFC_DEP_MASK;
493 rc = nci_set_config(ndev, NCI_LA_SEL_INFO, 1, &val);
497 val = NCI_LF_PROTOCOL_TYPE_NFC_DEP_MASK;
499 rc = nci_set_config(ndev, NCI_LF_PROTOCOL_TYPE, 1, &val);
503 val = NCI_LF_CON_BITR_F_212 | NCI_LF_CON_BITR_F_424;
505 return nci_set_config(ndev, NCI_LF_CON_BITR_F, 1, &val);
508 static int nci_start_poll(struct nfc_dev *nfc_dev,
509 __u32 im_protocols, __u32 tm_protocols)
511 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
512 struct nci_rf_discover_param param;
515 if ((atomic_read(&ndev->state) == NCI_DISCOVERY) ||
516 (atomic_read(&ndev->state) == NCI_W4_ALL_DISCOVERIES)) {
517 pr_err("unable to start poll, since poll is already active\n");
521 if (ndev->target_active_prot) {
522 pr_err("there is an active target\n");
526 if ((atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) ||
527 (atomic_read(&ndev->state) == NCI_POLL_ACTIVE)) {
528 pr_debug("target active or w4 select, implicitly deactivate\n");
530 rc = nci_request(ndev, nci_rf_deactivate_req, 0,
531 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
536 if ((im_protocols | tm_protocols) & NFC_PROTO_NFC_DEP_MASK) {
537 rc = nci_set_local_general_bytes(nfc_dev);
539 pr_err("failed to set local general bytes\n");
544 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
545 rc = nci_set_listen_parameters(nfc_dev);
547 pr_err("failed to set listen parameters\n");
550 param.im_protocols = im_protocols;
551 param.tm_protocols = tm_protocols;
552 rc = nci_request(ndev, nci_rf_discover_req, (unsigned long)¶m,
553 msecs_to_jiffies(NCI_RF_DISC_TIMEOUT));
556 ndev->poll_prots = im_protocols;
561 static void nci_stop_poll(struct nfc_dev *nfc_dev)
563 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
565 if ((atomic_read(&ndev->state) != NCI_DISCOVERY) &&
566 (atomic_read(&ndev->state) != NCI_W4_ALL_DISCOVERIES)) {
567 pr_err("unable to stop poll, since poll is not active\n");
571 nci_request(ndev, nci_rf_deactivate_req, 0,
572 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
575 static int nci_activate_target(struct nfc_dev *nfc_dev,
576 struct nfc_target *target, __u32 protocol)
578 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
579 struct nci_rf_discover_select_param param;
580 struct nfc_target *nci_target = NULL;
584 pr_debug("target_idx %d, protocol 0x%x\n", target->idx, protocol);
586 if ((atomic_read(&ndev->state) != NCI_W4_HOST_SELECT) &&
587 (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
588 pr_err("there is no available target to activate\n");
592 if (ndev->target_active_prot) {
593 pr_err("there is already an active target\n");
597 for (i = 0; i < ndev->n_targets; i++) {
598 if (ndev->targets[i].idx == target->idx) {
599 nci_target = &ndev->targets[i];
605 pr_err("unable to find the selected target\n");
609 if (!(nci_target->supported_protocols & (1 << protocol))) {
610 pr_err("target does not support the requested protocol 0x%x\n",
615 if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
616 param.rf_discovery_id = nci_target->logical_idx;
618 if (protocol == NFC_PROTO_JEWEL)
619 param.rf_protocol = NCI_RF_PROTOCOL_T1T;
620 else if (protocol == NFC_PROTO_MIFARE)
621 param.rf_protocol = NCI_RF_PROTOCOL_T2T;
622 else if (protocol == NFC_PROTO_FELICA)
623 param.rf_protocol = NCI_RF_PROTOCOL_T3T;
624 else if (protocol == NFC_PROTO_ISO14443 ||
625 protocol == NFC_PROTO_ISO14443_B)
626 param.rf_protocol = NCI_RF_PROTOCOL_ISO_DEP;
628 param.rf_protocol = NCI_RF_PROTOCOL_NFC_DEP;
630 rc = nci_request(ndev, nci_rf_discover_select_req,
631 (unsigned long)¶m,
632 msecs_to_jiffies(NCI_RF_DISC_SELECT_TIMEOUT));
636 ndev->target_active_prot = protocol;
641 static void nci_deactivate_target(struct nfc_dev *nfc_dev,
642 struct nfc_target *target)
644 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
648 if (!ndev->target_active_prot) {
649 pr_err("unable to deactivate target, no active target\n");
653 ndev->target_active_prot = 0;
655 if (atomic_read(&ndev->state) == NCI_POLL_ACTIVE) {
656 nci_request(ndev, nci_rf_deactivate_req, 0,
657 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
661 static int nci_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
662 __u8 comm_mode, __u8 *gb, size_t gb_len)
664 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
667 pr_debug("target_idx %d, comm_mode %d\n", target->idx, comm_mode);
669 rc = nci_activate_target(nfc_dev, target, NFC_PROTO_NFC_DEP);
673 rc = nfc_set_remote_general_bytes(nfc_dev, ndev->remote_gb,
674 ndev->remote_gb_len);
676 rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_PASSIVE,
682 static int nci_dep_link_down(struct nfc_dev *nfc_dev)
684 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
689 if (nfc_dev->rf_mode == NFC_RF_INITIATOR) {
690 nci_deactivate_target(nfc_dev, NULL);
692 if (atomic_read(&ndev->state) == NCI_LISTEN_ACTIVE ||
693 atomic_read(&ndev->state) == NCI_DISCOVERY) {
694 nci_request(ndev, nci_rf_deactivate_req, 0,
695 msecs_to_jiffies(NCI_RF_DEACTIVATE_TIMEOUT));
698 rc = nfc_tm_deactivated(nfc_dev);
700 pr_err("error when signaling tm deactivation\n");
707 static int nci_transceive(struct nfc_dev *nfc_dev, struct nfc_target *target,
709 data_exchange_cb_t cb, void *cb_context)
711 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
714 pr_debug("target_idx %d, len %d\n", target->idx, skb->len);
716 if (!ndev->target_active_prot) {
717 pr_err("unable to exchange data, no active target\n");
721 if (test_and_set_bit(NCI_DATA_EXCHANGE, &ndev->flags))
724 /* store cb and context to be used on receiving data */
725 ndev->data_exchange_cb = cb;
726 ndev->data_exchange_cb_context = cb_context;
728 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
730 clear_bit(NCI_DATA_EXCHANGE, &ndev->flags);
735 static int nci_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
737 struct nci_dev *ndev = nfc_get_drvdata(nfc_dev);
740 rc = nci_send_data(ndev, NCI_STATIC_RF_CONN_ID, skb);
742 pr_err("unable to send data\n");
747 static int nci_enable_se(struct nfc_dev *nfc_dev, u32 se_idx)
752 static int nci_disable_se(struct nfc_dev *nfc_dev, u32 se_idx)
757 static int nci_discover_se(struct nfc_dev *nfc_dev)
762 static struct nfc_ops nci_nfc_ops = {
763 .dev_up = nci_dev_up,
764 .dev_down = nci_dev_down,
765 .start_poll = nci_start_poll,
766 .stop_poll = nci_stop_poll,
767 .dep_link_up = nci_dep_link_up,
768 .dep_link_down = nci_dep_link_down,
769 .activate_target = nci_activate_target,
770 .deactivate_target = nci_deactivate_target,
771 .im_transceive = nci_transceive,
772 .tm_send = nci_tm_send,
773 .enable_se = nci_enable_se,
774 .disable_se = nci_disable_se,
775 .discover_se = nci_discover_se,
778 /* ---- Interface to NCI drivers ---- */
781 * nci_allocate_device - allocate a new nci device
783 * @ops: device operations
784 * @supported_protocols: NFC protocols supported by the device
786 struct nci_dev *nci_allocate_device(struct nci_ops *ops,
787 __u32 supported_protocols,
788 int tx_headroom, int tx_tailroom)
790 struct nci_dev *ndev;
792 pr_debug("supported_protocols 0x%x\n", supported_protocols);
794 if (!ops->open || !ops->close || !ops->send)
797 if (!supported_protocols)
800 ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL);
805 ndev->tx_headroom = tx_headroom;
806 ndev->tx_tailroom = tx_tailroom;
807 init_completion(&ndev->req_completion);
809 ndev->nfc_dev = nfc_allocate_device(&nci_nfc_ops,
811 tx_headroom + NCI_DATA_HDR_SIZE,
816 nfc_set_drvdata(ndev->nfc_dev, ndev);
824 EXPORT_SYMBOL(nci_allocate_device);
827 * nci_free_device - deallocate nci device
829 * @ndev: The nci device to deallocate
831 void nci_free_device(struct nci_dev *ndev)
833 nfc_free_device(ndev->nfc_dev);
836 EXPORT_SYMBOL(nci_free_device);
839 * nci_register_device - register a nci device in the nfc subsystem
841 * @dev: The nci device to register
843 int nci_register_device(struct nci_dev *ndev)
846 struct device *dev = &ndev->nfc_dev->dev;
851 INIT_WORK(&ndev->cmd_work, nci_cmd_work);
852 snprintf(name, sizeof(name), "%s_nci_cmd_wq", dev_name(dev));
853 ndev->cmd_wq = create_singlethread_workqueue(name);
859 INIT_WORK(&ndev->rx_work, nci_rx_work);
860 snprintf(name, sizeof(name), "%s_nci_rx_wq", dev_name(dev));
861 ndev->rx_wq = create_singlethread_workqueue(name);
864 goto destroy_cmd_wq_exit;
867 INIT_WORK(&ndev->tx_work, nci_tx_work);
868 snprintf(name, sizeof(name), "%s_nci_tx_wq", dev_name(dev));
869 ndev->tx_wq = create_singlethread_workqueue(name);
872 goto destroy_rx_wq_exit;
875 skb_queue_head_init(&ndev->cmd_q);
876 skb_queue_head_init(&ndev->rx_q);
877 skb_queue_head_init(&ndev->tx_q);
879 setup_timer(&ndev->cmd_timer, nci_cmd_timer,
880 (unsigned long) ndev);
881 setup_timer(&ndev->data_timer, nci_data_timer,
882 (unsigned long) ndev);
884 mutex_init(&ndev->req_lock);
886 rc = nfc_register_device(ndev->nfc_dev);
888 goto destroy_rx_wq_exit;
893 destroy_workqueue(ndev->rx_wq);
896 destroy_workqueue(ndev->cmd_wq);
901 EXPORT_SYMBOL(nci_register_device);
904 * nci_unregister_device - unregister a nci device in the nfc subsystem
906 * @dev: The nci device to unregister
908 void nci_unregister_device(struct nci_dev *ndev)
910 nci_close_device(ndev);
912 destroy_workqueue(ndev->cmd_wq);
913 destroy_workqueue(ndev->rx_wq);
914 destroy_workqueue(ndev->tx_wq);
916 nfc_unregister_device(ndev->nfc_dev);
918 EXPORT_SYMBOL(nci_unregister_device);
921 * nci_recv_frame - receive frame from NCI drivers
923 * @ndev: The nci device
924 * @skb: The sk_buff to receive
926 int nci_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
928 pr_debug("len %d\n", skb->len);
930 if (!ndev || (!test_bit(NCI_UP, &ndev->flags) &&
931 !test_bit(NCI_INIT, &ndev->flags))) {
936 /* Queue frame for rx worker thread */
937 skb_queue_tail(&ndev->rx_q, skb);
938 queue_work(ndev->rx_wq, &ndev->rx_work);
942 EXPORT_SYMBOL(nci_recv_frame);
944 static int nci_send_frame(struct nci_dev *ndev, struct sk_buff *skb)
946 pr_debug("len %d\n", skb->len);
953 /* Get rid of skb owner, prior to sending to the driver. */
956 /* Send copy to sniffer */
957 nfc_send_to_raw_sock(ndev->nfc_dev, skb,
958 RAW_PAYLOAD_NCI, NFC_DIRECTION_TX);
960 return ndev->ops->send(ndev, skb);
963 /* Send NCI command */
964 int nci_send_cmd(struct nci_dev *ndev, __u16 opcode, __u8 plen, void *payload)
966 struct nci_ctrl_hdr *hdr;
969 pr_debug("opcode 0x%x, plen %d\n", opcode, plen);
971 skb = nci_skb_alloc(ndev, (NCI_CTRL_HDR_SIZE + plen), GFP_KERNEL);
973 pr_err("no memory for command\n");
977 hdr = (struct nci_ctrl_hdr *) skb_put(skb, NCI_CTRL_HDR_SIZE);
978 hdr->gid = nci_opcode_gid(opcode);
979 hdr->oid = nci_opcode_oid(opcode);
982 nci_mt_set((__u8 *)hdr, NCI_MT_CMD_PKT);
983 nci_pbf_set((__u8 *)hdr, NCI_PBF_LAST);
986 memcpy(skb_put(skb, plen), payload, plen);
988 skb_queue_tail(&ndev->cmd_q, skb);
989 queue_work(ndev->cmd_wq, &ndev->cmd_work);
994 /* ---- NCI TX Data worker thread ---- */
996 static void nci_tx_work(struct work_struct *work)
998 struct nci_dev *ndev = container_of(work, struct nci_dev, tx_work);
1001 pr_debug("credits_cnt %d\n", atomic_read(&ndev->credits_cnt));
1003 /* Send queued tx data */
1004 while (atomic_read(&ndev->credits_cnt)) {
1005 skb = skb_dequeue(&ndev->tx_q);
1009 /* Check if data flow control is used */
1010 if (atomic_read(&ndev->credits_cnt) !=
1011 NCI_DATA_FLOW_CONTROL_NOT_USED)
1012 atomic_dec(&ndev->credits_cnt);
1014 pr_debug("NCI TX: MT=data, PBF=%d, conn_id=%d, plen=%d\n",
1016 nci_conn_id(skb->data),
1017 nci_plen(skb->data));
1019 nci_send_frame(ndev, skb);
1021 mod_timer(&ndev->data_timer,
1022 jiffies + msecs_to_jiffies(NCI_DATA_TIMEOUT));
1026 /* ----- NCI RX worker thread (data & control) ----- */
1028 static void nci_rx_work(struct work_struct *work)
1030 struct nci_dev *ndev = container_of(work, struct nci_dev, rx_work);
1031 struct sk_buff *skb;
1033 while ((skb = skb_dequeue(&ndev->rx_q))) {
1035 /* Send copy to sniffer */
1036 nfc_send_to_raw_sock(ndev->nfc_dev, skb,
1037 RAW_PAYLOAD_NCI, NFC_DIRECTION_RX);
1040 switch (nci_mt(skb->data)) {
1041 case NCI_MT_RSP_PKT:
1042 nci_rsp_packet(ndev, skb);
1045 case NCI_MT_NTF_PKT:
1046 nci_ntf_packet(ndev, skb);
1049 case NCI_MT_DATA_PKT:
1050 nci_rx_data_packet(ndev, skb);
1054 pr_err("unknown MT 0x%x\n", nci_mt(skb->data));
1060 /* check if a data exchange timout has occurred */
1061 if (test_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags)) {
1062 /* complete the data exchange transaction, if exists */
1063 if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
1064 nci_data_exchange_complete(ndev, NULL, -ETIMEDOUT);
1066 clear_bit(NCI_DATA_EXCHANGE_TO, &ndev->flags);
1070 /* ----- NCI TX CMD worker thread ----- */
1072 static void nci_cmd_work(struct work_struct *work)
1074 struct nci_dev *ndev = container_of(work, struct nci_dev, cmd_work);
1075 struct sk_buff *skb;
1077 pr_debug("cmd_cnt %d\n", atomic_read(&ndev->cmd_cnt));
1079 /* Send queued command */
1080 if (atomic_read(&ndev->cmd_cnt)) {
1081 skb = skb_dequeue(&ndev->cmd_q);
1085 atomic_dec(&ndev->cmd_cnt);
1087 pr_debug("NCI TX: MT=cmd, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
1089 nci_opcode_gid(nci_opcode(skb->data)),
1090 nci_opcode_oid(nci_opcode(skb->data)),
1091 nci_plen(skb->data));
1093 nci_send_frame(ndev, skb);
1095 mod_timer(&ndev->cmd_timer,
1096 jiffies + msecs_to_jiffies(NCI_CMD_TIMEOUT));
1100 MODULE_LICENSE("GPL");