1 // SPDX-License-Identifier: GPL-2.0-only
3 * NFC Digital Protocol stack
4 * Copyright (c) 2013, Intel Corporation.
7 #define pr_fmt(fmt) "digital: %s: " fmt, __func__
9 #include <linux/module.h>
13 #define DIGITAL_PROTO_NFCA_RF_TECH \
14 (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | \
15 NFC_PROTO_NFC_DEP_MASK | NFC_PROTO_ISO14443_MASK)
17 #define DIGITAL_PROTO_NFCB_RF_TECH NFC_PROTO_ISO14443_B_MASK
19 #define DIGITAL_PROTO_NFCF_RF_TECH \
20 (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)
22 #define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK
24 /* Delay between each poll frame (ms) */
25 #define DIGITAL_POLL_INTERVAL 10
28 struct list_head queue;
36 struct digital_tg_mdaa_params *mdaa_params;
38 nfc_digital_cmd_complete_t cmd_cb;
42 struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
47 skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom,
50 skb_reserve(skb, ddev->tx_headroom);
55 void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
56 u8 bitwise_inv, u8 msb_first)
60 crc = crc_func(init, skb->data, skb->len);
68 skb_put_u8(skb, crc & 0xFF);
69 skb_put_u8(skb, (crc >> 8) & 0xFF);
72 int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
73 u16 crc_init, u8 bitwise_inv, u8 msb_first)
81 crc = crc_func(crc_init, skb->data, skb->len - 2);
89 rc = (skb->data[skb->len - 2] - (crc & 0xFF)) +
90 (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF));
95 skb_trim(skb, skb->len - 2);
100 static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
102 ddev->ops->switch_rf(ddev, on);
105 static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
107 ddev->ops->abort_cmd(ddev);
110 static void digital_wq_cmd_complete(struct work_struct *work)
112 struct digital_cmd *cmd;
113 struct nfc_digital_dev *ddev = container_of(work,
114 struct nfc_digital_dev,
117 mutex_lock(&ddev->cmd_lock);
119 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
122 mutex_unlock(&ddev->cmd_lock);
126 list_del(&cmd->queue);
128 mutex_unlock(&ddev->cmd_lock);
130 if (!IS_ERR(cmd->resp))
131 print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1,
132 cmd->resp->data, cmd->resp->len, false);
134 cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp);
136 kfree(cmd->mdaa_params);
139 schedule_work(&ddev->cmd_work);
142 static void digital_send_cmd_complete(struct nfc_digital_dev *ddev,
143 void *arg, struct sk_buff *resp)
145 struct digital_cmd *cmd = arg;
149 schedule_work(&ddev->cmd_complete_work);
152 static void digital_wq_cmd(struct work_struct *work)
155 struct digital_cmd *cmd;
156 struct digital_tg_mdaa_params *params;
157 struct nfc_digital_dev *ddev = container_of(work,
158 struct nfc_digital_dev,
161 mutex_lock(&ddev->cmd_lock);
163 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
165 if (!cmd || cmd->pending) {
166 mutex_unlock(&ddev->cmd_lock);
172 mutex_unlock(&ddev->cmd_lock);
175 print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1,
176 cmd->req->data, cmd->req->len, false);
179 case DIGITAL_CMD_IN_SEND:
180 rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout,
181 digital_send_cmd_complete, cmd);
184 case DIGITAL_CMD_TG_SEND:
185 rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout,
186 digital_send_cmd_complete, cmd);
189 case DIGITAL_CMD_TG_LISTEN:
190 rc = ddev->ops->tg_listen(ddev, cmd->timeout,
191 digital_send_cmd_complete, cmd);
194 case DIGITAL_CMD_TG_LISTEN_MDAA:
195 params = cmd->mdaa_params;
197 rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout,
198 digital_send_cmd_complete, cmd);
201 case DIGITAL_CMD_TG_LISTEN_MD:
202 rc = ddev->ops->tg_listen_md(ddev, cmd->timeout,
203 digital_send_cmd_complete, cmd);
207 pr_err("Unknown cmd type %d\n", cmd->type);
214 pr_err("in_send_command returned err %d\n", rc);
216 mutex_lock(&ddev->cmd_lock);
217 list_del(&cmd->queue);
218 mutex_unlock(&ddev->cmd_lock);
221 kfree(cmd->mdaa_params);
224 schedule_work(&ddev->cmd_work);
227 int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
228 struct sk_buff *skb, struct digital_tg_mdaa_params *params,
229 u16 timeout, nfc_digital_cmd_complete_t cmd_cb,
232 struct digital_cmd *cmd;
234 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
238 cmd->type = cmd_type;
239 cmd->timeout = timeout;
241 cmd->mdaa_params = params;
242 cmd->cmd_cb = cmd_cb;
243 cmd->cb_context = cb_context;
244 INIT_LIST_HEAD(&cmd->queue);
246 mutex_lock(&ddev->cmd_lock);
247 list_add_tail(&cmd->queue, &ddev->cmd_queue);
248 mutex_unlock(&ddev->cmd_lock);
250 schedule_work(&ddev->cmd_work);
255 int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
259 rc = ddev->ops->in_configure_hw(ddev, type, param);
261 pr_err("in_configure_hw failed: %d\n", rc);
266 int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
270 rc = ddev->ops->tg_configure_hw(ddev, type, param);
272 pr_err("tg_configure_hw failed: %d\n", rc);
277 static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
279 struct digital_tg_mdaa_params *params;
282 params = kzalloc(sizeof(*params), GFP_KERNEL);
286 params->sens_res = DIGITAL_SENS_RES_NFC_DEP;
287 get_random_bytes(params->nfcid1, sizeof(params->nfcid1));
288 params->sel_res = DIGITAL_SEL_RES_NFC_DEP;
290 params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
291 params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
292 get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
293 params->sc = DIGITAL_SENSF_FELICA_SC;
295 rc = digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
296 500, digital_tg_recv_atr_req, NULL);
303 static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech)
305 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, 500,
306 digital_tg_recv_md_req, NULL);
309 int digital_target_found(struct nfc_digital_dev *ddev,
310 struct nfc_target *target, u8 protocol)
316 int (*check_crc)(struct sk_buff *skb);
317 void (*add_crc)(struct sk_buff *skb);
319 rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech;
322 case NFC_PROTO_JEWEL:
323 framing = NFC_DIGITAL_FRAMING_NFCA_T1T;
324 check_crc = digital_skb_check_crc_b;
325 add_crc = digital_skb_add_crc_b;
328 case NFC_PROTO_MIFARE:
329 framing = NFC_DIGITAL_FRAMING_NFCA_T2T;
330 check_crc = digital_skb_check_crc_a;
331 add_crc = digital_skb_add_crc_a;
334 case NFC_PROTO_FELICA:
335 framing = NFC_DIGITAL_FRAMING_NFCF_T3T;
336 check_crc = digital_skb_check_crc_f;
337 add_crc = digital_skb_add_crc_f;
340 case NFC_PROTO_NFC_DEP:
341 if (rf_tech == NFC_DIGITAL_RF_TECH_106A) {
342 framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP;
343 check_crc = digital_skb_check_crc_a;
344 add_crc = digital_skb_add_crc_a;
346 framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP;
347 check_crc = digital_skb_check_crc_f;
348 add_crc = digital_skb_add_crc_f;
352 case NFC_PROTO_ISO15693:
353 framing = NFC_DIGITAL_FRAMING_ISO15693_T5T;
354 check_crc = digital_skb_check_crc_b;
355 add_crc = digital_skb_add_crc_b;
358 case NFC_PROTO_ISO14443:
359 framing = NFC_DIGITAL_FRAMING_NFCA_T4T;
360 check_crc = digital_skb_check_crc_a;
361 add_crc = digital_skb_add_crc_a;
364 case NFC_PROTO_ISO14443_B:
365 framing = NFC_DIGITAL_FRAMING_NFCB_T4T;
366 check_crc = digital_skb_check_crc_b;
367 add_crc = digital_skb_add_crc_b;
371 pr_err("Invalid protocol %d\n", protocol);
375 pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);
377 ddev->curr_rf_tech = rf_tech;
379 if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
380 ddev->skb_add_crc = digital_skb_add_crc_none;
381 ddev->skb_check_crc = digital_skb_check_crc_none;
383 ddev->skb_add_crc = add_crc;
384 ddev->skb_check_crc = check_crc;
387 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing);
391 target->supported_protocols = (1 << protocol);
393 poll_tech_count = ddev->poll_tech_count;
394 ddev->poll_tech_count = 0;
396 rc = nfc_targets_found(ddev->nfc_dev, target, 1);
398 ddev->poll_tech_count = poll_tech_count;
405 void digital_poll_next_tech(struct nfc_digital_dev *ddev)
409 digital_switch_rf(ddev, 0);
411 mutex_lock(&ddev->poll_lock);
413 if (!ddev->poll_tech_count) {
414 mutex_unlock(&ddev->poll_lock);
418 get_random_bytes(&rand_mod, sizeof(rand_mod));
419 ddev->poll_tech_index = rand_mod % ddev->poll_tech_count;
421 mutex_unlock(&ddev->poll_lock);
423 schedule_delayed_work(&ddev->poll_work,
424 msecs_to_jiffies(DIGITAL_POLL_INTERVAL));
427 static void digital_wq_poll(struct work_struct *work)
430 struct digital_poll_tech *poll_tech;
431 struct nfc_digital_dev *ddev = container_of(work,
432 struct nfc_digital_dev,
434 mutex_lock(&ddev->poll_lock);
436 if (!ddev->poll_tech_count) {
437 mutex_unlock(&ddev->poll_lock);
441 poll_tech = &ddev->poll_techs[ddev->poll_tech_index];
443 mutex_unlock(&ddev->poll_lock);
445 rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
447 digital_poll_next_tech(ddev);
450 static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
451 digital_poll_t poll_func)
453 struct digital_poll_tech *poll_tech;
455 if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
458 poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];
460 poll_tech->rf_tech = rf_tech;
461 poll_tech->poll_func = poll_func;
465 * start_poll operation
467 * For every supported protocol, the corresponding polling function is added
468 * to the table of polling technologies (ddev->poll_techs[]) using
469 * digital_add_poll_tech().
470 * When a polling function fails (by timeout or protocol error) the next one is
471 * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
473 static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
476 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
477 u32 matching_im_protocols, matching_tm_protocols;
479 pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols,
480 tm_protocols, ddev->protocols);
482 matching_im_protocols = ddev->protocols & im_protocols;
483 matching_tm_protocols = ddev->protocols & tm_protocols;
485 if (!matching_im_protocols && !matching_tm_protocols) {
486 pr_err("Unknown protocol\n");
490 if (ddev->poll_tech_count) {
491 pr_err("Already polling\n");
495 if (ddev->curr_protocol) {
496 pr_err("A target is already active\n");
500 ddev->poll_tech_count = 0;
501 ddev->poll_tech_index = 0;
503 if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
504 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
505 digital_in_send_sens_req);
507 if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH)
508 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B,
509 digital_in_send_sensb_req);
511 if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
512 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
513 digital_in_send_sensf_req);
515 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
516 digital_in_send_sensf_req);
519 if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH)
520 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693,
521 digital_in_send_iso15693_inv_req);
523 if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
524 if (ddev->ops->tg_listen_mdaa) {
525 digital_add_poll_tech(ddev, 0,
526 digital_tg_listen_mdaa);
527 } else if (ddev->ops->tg_listen_md) {
528 digital_add_poll_tech(ddev, 0,
529 digital_tg_listen_md);
531 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
532 digital_tg_listen_nfca);
534 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
535 digital_tg_listen_nfcf);
537 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
538 digital_tg_listen_nfcf);
542 if (!ddev->poll_tech_count) {
543 pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n",
544 matching_im_protocols, matching_tm_protocols);
548 schedule_delayed_work(&ddev->poll_work, 0);
553 static void digital_stop_poll(struct nfc_dev *nfc_dev)
555 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
557 mutex_lock(&ddev->poll_lock);
559 if (!ddev->poll_tech_count) {
560 pr_err("Polling operation was not running\n");
561 mutex_unlock(&ddev->poll_lock);
565 ddev->poll_tech_count = 0;
567 mutex_unlock(&ddev->poll_lock);
569 cancel_delayed_work_sync(&ddev->poll_work);
571 digital_abort_cmd(ddev);
574 static int digital_dev_up(struct nfc_dev *nfc_dev)
576 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
578 digital_switch_rf(ddev, 1);
583 static int digital_dev_down(struct nfc_dev *nfc_dev)
585 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
587 digital_switch_rf(ddev, 0);
592 static int digital_dep_link_up(struct nfc_dev *nfc_dev,
593 struct nfc_target *target,
594 __u8 comm_mode, __u8 *gb, size_t gb_len)
596 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
599 rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
602 ddev->curr_protocol = NFC_PROTO_NFC_DEP;
607 static int digital_dep_link_down(struct nfc_dev *nfc_dev)
609 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
611 digital_abort_cmd(ddev);
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 digital_abort_cmd(ddev);
650 ddev->curr_protocol = 0;
653 static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb)
655 struct nfc_digital_dev *ddev = nfc_get_drvdata(dev);
657 return digital_tg_send_dep_res(ddev, skb);
660 static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg,
661 struct sk_buff *resp)
663 struct digital_data_exch *data_exch = arg;
672 if (ddev->curr_protocol == NFC_PROTO_MIFARE) {
673 rc = digital_in_recv_mifare_res(resp);
674 /* crc check is done in digital_in_recv_mifare_res() */
678 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
679 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
680 rc = digital_in_iso_dep_pull_sod(ddev, resp);
685 rc = ddev->skb_check_crc(resp);
693 data_exch->cb(data_exch->cb_context, resp, rc);
698 static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target,
699 struct sk_buff *skb, data_exchange_cb_t cb,
702 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
703 struct digital_data_exch *data_exch;
706 data_exch = kzalloc(sizeof(*data_exch), GFP_KERNEL);
711 data_exch->cb_context = cb_context;
713 if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) {
714 rc = digital_in_send_dep_req(ddev, target, skb, data_exch);
718 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
719 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
720 rc = digital_in_iso_dep_push_sod(ddev, skb);
725 ddev->skb_add_crc(skb);
727 rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
737 static struct nfc_ops digital_nfc_ops = {
738 .dev_up = digital_dev_up,
739 .dev_down = digital_dev_down,
740 .start_poll = digital_start_poll,
741 .stop_poll = digital_stop_poll,
742 .dep_link_up = digital_dep_link_up,
743 .dep_link_down = digital_dep_link_down,
744 .activate_target = digital_activate_target,
745 .deactivate_target = digital_deactivate_target,
746 .tm_send = digital_tg_send,
747 .im_transceive = digital_in_send,
750 struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
751 __u32 supported_protocols,
752 __u32 driver_capabilities,
753 int tx_headroom, int tx_tailroom)
755 struct nfc_digital_dev *ddev;
757 if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen ||
758 !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd ||
759 !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech))
762 ddev = kzalloc(sizeof(*ddev), GFP_KERNEL);
766 ddev->driver_capabilities = driver_capabilities;
769 mutex_init(&ddev->cmd_lock);
770 INIT_LIST_HEAD(&ddev->cmd_queue);
772 INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
773 INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
775 mutex_init(&ddev->poll_lock);
776 INIT_DELAYED_WORK(&ddev->poll_work, digital_wq_poll);
778 if (supported_protocols & NFC_PROTO_JEWEL_MASK)
779 ddev->protocols |= NFC_PROTO_JEWEL_MASK;
780 if (supported_protocols & NFC_PROTO_MIFARE_MASK)
781 ddev->protocols |= NFC_PROTO_MIFARE_MASK;
782 if (supported_protocols & NFC_PROTO_FELICA_MASK)
783 ddev->protocols |= NFC_PROTO_FELICA_MASK;
784 if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
785 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
786 if (supported_protocols & NFC_PROTO_ISO15693_MASK)
787 ddev->protocols |= NFC_PROTO_ISO15693_MASK;
788 if (supported_protocols & NFC_PROTO_ISO14443_MASK)
789 ddev->protocols |= NFC_PROTO_ISO14443_MASK;
790 if (supported_protocols & NFC_PROTO_ISO14443_B_MASK)
791 ddev->protocols |= NFC_PROTO_ISO14443_B_MASK;
793 ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
794 ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
796 ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
799 if (!ddev->nfc_dev) {
800 pr_err("nfc_allocate_device failed\n");
804 nfc_set_drvdata(ddev->nfc_dev, ddev);
813 EXPORT_SYMBOL(nfc_digital_allocate_device);
815 void nfc_digital_free_device(struct nfc_digital_dev *ddev)
817 nfc_free_device(ddev->nfc_dev);
820 EXPORT_SYMBOL(nfc_digital_free_device);
822 int nfc_digital_register_device(struct nfc_digital_dev *ddev)
824 return nfc_register_device(ddev->nfc_dev);
826 EXPORT_SYMBOL(nfc_digital_register_device);
828 void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
830 struct digital_cmd *cmd, *n;
832 nfc_unregister_device(ddev->nfc_dev);
834 mutex_lock(&ddev->poll_lock);
835 ddev->poll_tech_count = 0;
836 mutex_unlock(&ddev->poll_lock);
838 cancel_delayed_work_sync(&ddev->poll_work);
839 cancel_work_sync(&ddev->cmd_work);
840 cancel_work_sync(&ddev->cmd_complete_work);
842 list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
843 list_del(&cmd->queue);
845 /* Call the command callback if any and pass it a ENODEV error.
846 * This gives a chance to the command issuer to free any
850 cmd->cmd_cb(ddev, cmd->cb_context, ERR_PTR(-ENODEV));
852 kfree(cmd->mdaa_params);
856 EXPORT_SYMBOL(nfc_digital_unregister_device);
858 MODULE_LICENSE("GPL");