2 * NFC Digital Protocol stack
3 * Copyright (c) 2013, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 #define pr_fmt(fmt) "digital: %s: " fmt, __func__
18 #include <linux/module.h>
22 #define DIGITAL_PROTO_NFCA_RF_TECH \
23 (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | NFC_PROTO_NFC_DEP_MASK)
25 #define DIGITAL_PROTO_NFCB_RF_TECH NFC_PROTO_ISO14443_B_MASK
27 #define DIGITAL_PROTO_NFCF_RF_TECH \
28 (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)
30 #define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK
33 struct list_head queue;
41 struct digital_tg_mdaa_params *mdaa_params;
43 nfc_digital_cmd_complete_t cmd_cb;
47 struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
52 skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom,
55 skb_reserve(skb, ddev->tx_headroom);
60 void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
61 u8 bitwise_inv, u8 msb_first)
65 crc = crc_func(init, skb->data, skb->len);
73 *skb_put(skb, 1) = crc & 0xFF;
74 *skb_put(skb, 1) = (crc >> 8) & 0xFF;
77 int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
78 u16 crc_init, u8 bitwise_inv, u8 msb_first)
86 crc = crc_func(crc_init, skb->data, skb->len - 2);
94 rc = (skb->data[skb->len - 2] - (crc & 0xFF)) +
95 (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF));
100 skb_trim(skb, skb->len - 2);
105 static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
107 ddev->ops->switch_rf(ddev, on);
110 static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
112 ddev->ops->abort_cmd(ddev);
115 static void digital_wq_cmd_complete(struct work_struct *work)
117 struct digital_cmd *cmd;
118 struct nfc_digital_dev *ddev = container_of(work,
119 struct nfc_digital_dev,
122 mutex_lock(&ddev->cmd_lock);
124 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
127 mutex_unlock(&ddev->cmd_lock);
131 list_del(&cmd->queue);
133 mutex_unlock(&ddev->cmd_lock);
135 if (!IS_ERR(cmd->resp))
136 print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1,
137 cmd->resp->data, cmd->resp->len, false);
139 cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp);
141 kfree(cmd->mdaa_params);
144 schedule_work(&ddev->cmd_work);
147 static void digital_send_cmd_complete(struct nfc_digital_dev *ddev,
148 void *arg, struct sk_buff *resp)
150 struct digital_cmd *cmd = arg;
154 schedule_work(&ddev->cmd_complete_work);
157 static void digital_wq_cmd(struct work_struct *work)
160 struct digital_cmd *cmd;
161 struct digital_tg_mdaa_params *params;
162 struct nfc_digital_dev *ddev = container_of(work,
163 struct nfc_digital_dev,
166 mutex_lock(&ddev->cmd_lock);
168 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
170 if (!cmd || cmd->pending) {
171 mutex_unlock(&ddev->cmd_lock);
175 mutex_unlock(&ddev->cmd_lock);
178 print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1,
179 cmd->req->data, cmd->req->len, false);
182 case DIGITAL_CMD_IN_SEND:
183 rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout,
184 digital_send_cmd_complete, cmd);
187 case DIGITAL_CMD_TG_SEND:
188 rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout,
189 digital_send_cmd_complete, cmd);
192 case DIGITAL_CMD_TG_LISTEN:
193 rc = ddev->ops->tg_listen(ddev, cmd->timeout,
194 digital_send_cmd_complete, cmd);
197 case DIGITAL_CMD_TG_LISTEN_MDAA:
198 params = cmd->mdaa_params;
200 rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout,
201 digital_send_cmd_complete, cmd);
204 case DIGITAL_CMD_TG_LISTEN_MD:
205 rc = ddev->ops->tg_listen_md(ddev, cmd->timeout,
206 digital_send_cmd_complete, cmd);
210 pr_err("Unknown cmd type %d\n", cmd->type);
217 pr_err("in_send_command returned err %d\n", rc);
219 mutex_lock(&ddev->cmd_lock);
220 list_del(&cmd->queue);
221 mutex_unlock(&ddev->cmd_lock);
224 kfree(cmd->mdaa_params);
227 schedule_work(&ddev->cmd_work);
230 int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
231 struct sk_buff *skb, struct digital_tg_mdaa_params *params,
232 u16 timeout, nfc_digital_cmd_complete_t cmd_cb,
235 struct digital_cmd *cmd;
237 cmd = kzalloc(sizeof(struct digital_cmd), GFP_KERNEL);
241 cmd->type = cmd_type;
242 cmd->timeout = timeout;
244 cmd->mdaa_params = params;
245 cmd->cmd_cb = cmd_cb;
246 cmd->cb_context = cb_context;
247 INIT_LIST_HEAD(&cmd->queue);
249 mutex_lock(&ddev->cmd_lock);
250 list_add_tail(&cmd->queue, &ddev->cmd_queue);
251 mutex_unlock(&ddev->cmd_lock);
253 schedule_work(&ddev->cmd_work);
258 int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
262 rc = ddev->ops->in_configure_hw(ddev, type, param);
264 pr_err("in_configure_hw failed: %d\n", rc);
269 int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
273 rc = ddev->ops->tg_configure_hw(ddev, type, param);
275 pr_err("tg_configure_hw failed: %d\n", rc);
280 static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
282 struct digital_tg_mdaa_params *params;
285 params = kzalloc(sizeof(struct digital_tg_mdaa_params), GFP_KERNEL);
289 params->sens_res = DIGITAL_SENS_RES_NFC_DEP;
290 get_random_bytes(params->nfcid1, sizeof(params->nfcid1));
291 params->sel_res = DIGITAL_SEL_RES_NFC_DEP;
293 params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
294 params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
295 get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
296 params->sc = DIGITAL_SENSF_FELICA_SC;
298 rc = digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
299 500, digital_tg_recv_atr_req, NULL);
306 static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech)
308 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, 500,
309 digital_tg_recv_md_req, NULL);
312 int digital_target_found(struct nfc_digital_dev *ddev,
313 struct nfc_target *target, u8 protocol)
319 int (*check_crc)(struct sk_buff *skb);
320 void (*add_crc)(struct sk_buff *skb);
322 rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech;
325 case NFC_PROTO_JEWEL:
326 framing = NFC_DIGITAL_FRAMING_NFCA_T1T;
327 check_crc = digital_skb_check_crc_b;
328 add_crc = digital_skb_add_crc_b;
331 case NFC_PROTO_MIFARE:
332 framing = NFC_DIGITAL_FRAMING_NFCA_T2T;
333 check_crc = digital_skb_check_crc_a;
334 add_crc = digital_skb_add_crc_a;
337 case NFC_PROTO_FELICA:
338 framing = NFC_DIGITAL_FRAMING_NFCF_T3T;
339 check_crc = digital_skb_check_crc_f;
340 add_crc = digital_skb_add_crc_f;
343 case NFC_PROTO_NFC_DEP:
344 if (rf_tech == NFC_DIGITAL_RF_TECH_106A) {
345 framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP;
346 check_crc = digital_skb_check_crc_a;
347 add_crc = digital_skb_add_crc_a;
349 framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP;
350 check_crc = digital_skb_check_crc_f;
351 add_crc = digital_skb_add_crc_f;
355 case NFC_PROTO_ISO15693:
356 framing = NFC_DIGITAL_FRAMING_ISO15693_T5T;
357 check_crc = digital_skb_check_crc_b;
358 add_crc = digital_skb_add_crc_b;
361 case NFC_PROTO_ISO14443:
362 framing = NFC_DIGITAL_FRAMING_NFCA_T4T;
363 check_crc = digital_skb_check_crc_a;
364 add_crc = digital_skb_add_crc_a;
367 case NFC_PROTO_ISO14443_B:
368 framing = NFC_DIGITAL_FRAMING_NFCB_T4T;
369 check_crc = digital_skb_check_crc_b;
370 add_crc = digital_skb_add_crc_b;
374 pr_err("Invalid protocol %d\n", protocol);
378 pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);
380 ddev->curr_rf_tech = rf_tech;
382 if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
383 ddev->skb_add_crc = digital_skb_add_crc_none;
384 ddev->skb_check_crc = digital_skb_check_crc_none;
386 ddev->skb_add_crc = add_crc;
387 ddev->skb_check_crc = check_crc;
390 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing);
394 target->supported_protocols = (1 << protocol);
396 poll_tech_count = ddev->poll_tech_count;
397 ddev->poll_tech_count = 0;
399 rc = nfc_targets_found(ddev->nfc_dev, target, 1);
401 ddev->poll_tech_count = poll_tech_count;
408 void digital_poll_next_tech(struct nfc_digital_dev *ddev)
412 digital_switch_rf(ddev, 0);
414 mutex_lock(&ddev->poll_lock);
416 if (!ddev->poll_tech_count) {
417 mutex_unlock(&ddev->poll_lock);
421 get_random_bytes(&rand_mod, sizeof(rand_mod));
422 ddev->poll_tech_index = rand_mod % ddev->poll_tech_count;
424 mutex_unlock(&ddev->poll_lock);
426 schedule_work(&ddev->poll_work);
429 static void digital_wq_poll(struct work_struct *work)
432 struct digital_poll_tech *poll_tech;
433 struct nfc_digital_dev *ddev = container_of(work,
434 struct nfc_digital_dev,
436 mutex_lock(&ddev->poll_lock);
438 if (!ddev->poll_tech_count) {
439 mutex_unlock(&ddev->poll_lock);
443 poll_tech = &ddev->poll_techs[ddev->poll_tech_index];
445 mutex_unlock(&ddev->poll_lock);
447 rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
449 digital_poll_next_tech(ddev);
452 static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
453 digital_poll_t poll_func)
455 struct digital_poll_tech *poll_tech;
457 if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
460 poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];
462 poll_tech->rf_tech = rf_tech;
463 poll_tech->poll_func = poll_func;
467 * start_poll operation
469 * For every supported protocol, the corresponding polling function is added
470 * to the table of polling technologies (ddev->poll_techs[]) using
471 * digital_add_poll_tech().
472 * When a polling function fails (by timeout or protocol error) the next one is
473 * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
475 static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
478 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
479 u32 matching_im_protocols, matching_tm_protocols;
481 pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols,
482 tm_protocols, ddev->protocols);
484 matching_im_protocols = ddev->protocols & im_protocols;
485 matching_tm_protocols = ddev->protocols & tm_protocols;
487 if (!matching_im_protocols && !matching_tm_protocols) {
488 pr_err("Unknown protocol\n");
492 if (ddev->poll_tech_count) {
493 pr_err("Already polling\n");
497 if (ddev->curr_protocol) {
498 pr_err("A target is already active\n");
502 ddev->poll_tech_count = 0;
503 ddev->poll_tech_index = 0;
505 if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
506 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
507 digital_in_send_sens_req);
509 if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH)
510 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B,
511 digital_in_send_sensb_req);
513 if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
514 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
515 digital_in_send_sensf_req);
517 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
518 digital_in_send_sensf_req);
521 if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH)
522 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693,
523 digital_in_send_iso15693_inv_req);
525 if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
526 if (ddev->ops->tg_listen_mdaa) {
527 digital_add_poll_tech(ddev, 0,
528 digital_tg_listen_mdaa);
529 } else if (ddev->ops->tg_listen_md) {
530 digital_add_poll_tech(ddev, 0,
531 digital_tg_listen_md);
533 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
534 digital_tg_listen_nfca);
536 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
537 digital_tg_listen_nfcf);
539 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
540 digital_tg_listen_nfcf);
544 if (!ddev->poll_tech_count) {
545 pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n",
546 matching_im_protocols, matching_tm_protocols);
550 schedule_work(&ddev->poll_work);
555 static void digital_stop_poll(struct nfc_dev *nfc_dev)
557 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
559 mutex_lock(&ddev->poll_lock);
561 if (!ddev->poll_tech_count) {
562 pr_err("Polling operation was not running\n");
563 mutex_unlock(&ddev->poll_lock);
567 ddev->poll_tech_count = 0;
569 mutex_unlock(&ddev->poll_lock);
571 cancel_work_sync(&ddev->poll_work);
573 digital_abort_cmd(ddev);
576 static int digital_dev_up(struct nfc_dev *nfc_dev)
578 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
580 digital_switch_rf(ddev, 1);
585 static int digital_dev_down(struct nfc_dev *nfc_dev)
587 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
589 digital_switch_rf(ddev, 0);
594 static int digital_dep_link_up(struct nfc_dev *nfc_dev,
595 struct nfc_target *target,
596 __u8 comm_mode, __u8 *gb, size_t gb_len)
598 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
601 rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
604 ddev->curr_protocol = NFC_PROTO_NFC_DEP;
609 static int digital_dep_link_down(struct nfc_dev *nfc_dev)
611 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
613 ddev->curr_protocol = 0;
618 static int digital_activate_target(struct nfc_dev *nfc_dev,
619 struct nfc_target *target, __u32 protocol)
621 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
623 if (ddev->poll_tech_count) {
624 pr_err("Can't activate a target while polling\n");
628 if (ddev->curr_protocol) {
629 pr_err("A target is already active\n");
633 ddev->curr_protocol = protocol;
638 static void digital_deactivate_target(struct nfc_dev *nfc_dev,
639 struct nfc_target *target,
642 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
644 if (!ddev->curr_protocol) {
645 pr_err("No active target\n");
649 ddev->curr_protocol = 0;
652 static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb)
654 struct nfc_digital_dev *ddev = nfc_get_drvdata(dev);
656 return digital_tg_send_dep_res(ddev, skb);
659 static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg,
660 struct sk_buff *resp)
662 struct digital_data_exch *data_exch = arg;
671 if (ddev->curr_protocol == NFC_PROTO_MIFARE) {
672 rc = digital_in_recv_mifare_res(resp);
673 /* crc check is done in digital_in_recv_mifare_res() */
677 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
678 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
679 rc = digital_in_iso_dep_pull_sod(ddev, resp);
684 rc = ddev->skb_check_crc(resp);
692 data_exch->cb(data_exch->cb_context, resp, rc);
697 static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target,
698 struct sk_buff *skb, data_exchange_cb_t cb,
701 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
702 struct digital_data_exch *data_exch;
705 data_exch = kzalloc(sizeof(struct digital_data_exch), GFP_KERNEL);
707 pr_err("Failed to allocate data_exch struct\n");
712 data_exch->cb_context = cb_context;
714 if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) {
715 rc = digital_in_send_dep_req(ddev, target, skb, data_exch);
719 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
720 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
721 rc = digital_in_iso_dep_push_sod(ddev, skb);
726 ddev->skb_add_crc(skb);
728 rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
738 static struct nfc_ops digital_nfc_ops = {
739 .dev_up = digital_dev_up,
740 .dev_down = digital_dev_down,
741 .start_poll = digital_start_poll,
742 .stop_poll = digital_stop_poll,
743 .dep_link_up = digital_dep_link_up,
744 .dep_link_down = digital_dep_link_down,
745 .activate_target = digital_activate_target,
746 .deactivate_target = digital_deactivate_target,
747 .tm_send = digital_tg_send,
748 .im_transceive = digital_in_send,
751 struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
752 __u32 supported_protocols,
753 __u32 driver_capabilities,
754 int tx_headroom, int tx_tailroom)
756 struct nfc_digital_dev *ddev;
758 if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen ||
759 !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd ||
760 !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech))
763 ddev = kzalloc(sizeof(struct nfc_digital_dev), GFP_KERNEL);
767 ddev->driver_capabilities = driver_capabilities;
770 mutex_init(&ddev->cmd_lock);
771 INIT_LIST_HEAD(&ddev->cmd_queue);
773 INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
774 INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
776 mutex_init(&ddev->poll_lock);
777 INIT_WORK(&ddev->poll_work, digital_wq_poll);
779 if (supported_protocols & NFC_PROTO_JEWEL_MASK)
780 ddev->protocols |= NFC_PROTO_JEWEL_MASK;
781 if (supported_protocols & NFC_PROTO_MIFARE_MASK)
782 ddev->protocols |= NFC_PROTO_MIFARE_MASK;
783 if (supported_protocols & NFC_PROTO_FELICA_MASK)
784 ddev->protocols |= NFC_PROTO_FELICA_MASK;
785 if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
786 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
787 if (supported_protocols & NFC_PROTO_ISO15693_MASK)
788 ddev->protocols |= NFC_PROTO_ISO15693_MASK;
789 if (supported_protocols & NFC_PROTO_ISO14443_MASK)
790 ddev->protocols |= NFC_PROTO_ISO14443_MASK;
791 if (supported_protocols & NFC_PROTO_ISO14443_B_MASK)
792 ddev->protocols |= NFC_PROTO_ISO14443_B_MASK;
794 ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
795 ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
797 ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
800 if (!ddev->nfc_dev) {
801 pr_err("nfc_allocate_device failed\n");
805 nfc_set_drvdata(ddev->nfc_dev, ddev);
814 EXPORT_SYMBOL(nfc_digital_allocate_device);
816 void nfc_digital_free_device(struct nfc_digital_dev *ddev)
818 nfc_free_device(ddev->nfc_dev);
821 EXPORT_SYMBOL(nfc_digital_free_device);
823 int nfc_digital_register_device(struct nfc_digital_dev *ddev)
825 return nfc_register_device(ddev->nfc_dev);
827 EXPORT_SYMBOL(nfc_digital_register_device);
829 void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
831 struct digital_cmd *cmd, *n;
833 nfc_unregister_device(ddev->nfc_dev);
835 mutex_lock(&ddev->poll_lock);
836 ddev->poll_tech_count = 0;
837 mutex_unlock(&ddev->poll_lock);
839 cancel_work_sync(&ddev->poll_work);
840 cancel_work_sync(&ddev->cmd_work);
841 cancel_work_sync(&ddev->cmd_complete_work);
843 list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
844 list_del(&cmd->queue);
845 kfree(cmd->mdaa_params);
849 EXPORT_SYMBOL(nfc_digital_unregister_device);
851 MODULE_LICENSE("GPL");