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1/*
2 * NFC Digital Protocol stack
3 * Copyright (c) 2013, Intel Corporation.
4 *
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.
8 *
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
12 * more details.
13 *
14 */
15
16#define pr_fmt(fmt) "digital: %s: " fmt, __func__
17
18#include <linux/module.h>
19
20#include "digital.h"
21
22#define DIGITAL_PROTO_NFCA_RF_TECH \
23 (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | NFC_PROTO_NFC_DEP_MASK)
24
25#define DIGITAL_PROTO_NFCF_RF_TECH \
26 (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)
27
28#define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK
29
30struct digital_cmd {
31 struct list_head queue;
32
33 u8 type;
34 u8 pending;
35
36 u16 timeout;
37 struct sk_buff *req;
38 struct sk_buff *resp;
39 struct digital_tg_mdaa_params *mdaa_params;
40
41 nfc_digital_cmd_complete_t cmd_cb;
42 void *cb_context;
43};
44
45struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
46 unsigned int len)
47{
48 struct sk_buff *skb;
49
50 skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom,
51 GFP_KERNEL);
52 if (skb)
53 skb_reserve(skb, ddev->tx_headroom);
54
55 return skb;
56}
57
58void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
59 u8 bitwise_inv, u8 msb_first)
60{
61 u16 crc;
62
63 crc = crc_func(init, skb->data, skb->len);
64
65 if (bitwise_inv)
66 crc = ~crc;
67
68 if (msb_first)
69 crc = __fswab16(crc);
70
71 *skb_put(skb, 1) = crc & 0xFF;
72 *skb_put(skb, 1) = (crc >> 8) & 0xFF;
73}
74
75int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
76 u16 crc_init, u8 bitwise_inv, u8 msb_first)
77{
78 int rc;
79 u16 crc;
80
81 if (skb->len <= 2)
82 return -EIO;
83
84 crc = crc_func(crc_init, skb->data, skb->len - 2);
85
86 if (bitwise_inv)
87 crc = ~crc;
88
89 if (msb_first)
90 crc = __swab16(crc);
91
92 rc = (skb->data[skb->len - 2] - (crc & 0xFF)) +
93 (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF));
94
95 if (rc)
96 return -EIO;
97
98 skb_trim(skb, skb->len - 2);
99
100 return 0;
101}
102
103static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
104{
105 ddev->ops->switch_rf(ddev, on);
106}
107
108static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
109{
110 ddev->ops->abort_cmd(ddev);
111}
112
113static void digital_wq_cmd_complete(struct work_struct *work)
114{
115 struct digital_cmd *cmd;
116 struct nfc_digital_dev *ddev = container_of(work,
117 struct nfc_digital_dev,
118 cmd_complete_work);
119
120 mutex_lock(&ddev->cmd_lock);
121
122 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
123 queue);
124 if (!cmd) {
125 mutex_unlock(&ddev->cmd_lock);
126 return;
127 }
128
129 list_del(&cmd->queue);
130
131 mutex_unlock(&ddev->cmd_lock);
132
133 if (!IS_ERR(cmd->resp))
134 print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1,
135 cmd->resp->data, cmd->resp->len, false);
136
137 cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp);
138
139 kfree(cmd->mdaa_params);
140 kfree(cmd);
141
142 schedule_work(&ddev->cmd_work);
143}
144
145static void digital_send_cmd_complete(struct nfc_digital_dev *ddev,
146 void *arg, struct sk_buff *resp)
147{
148 struct digital_cmd *cmd = arg;
149
150 cmd->resp = resp;
151
152 schedule_work(&ddev->cmd_complete_work);
153}
154
155static void digital_wq_cmd(struct work_struct *work)
156{
157 int rc;
158 struct digital_cmd *cmd;
159 struct digital_tg_mdaa_params *params;
160 struct nfc_digital_dev *ddev = container_of(work,
161 struct nfc_digital_dev,
162 cmd_work);
163
164 mutex_lock(&ddev->cmd_lock);
165
166 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
167 queue);
168 if (!cmd || cmd->pending) {
169 mutex_unlock(&ddev->cmd_lock);
170 return;
171 }
172
173 mutex_unlock(&ddev->cmd_lock);
174
175 if (cmd->req)
176 print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1,
177 cmd->req->data, cmd->req->len, false);
178
179 switch (cmd->type) {
180 case DIGITAL_CMD_IN_SEND:
181 rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout,
182 digital_send_cmd_complete, cmd);
183 break;
184
185 case DIGITAL_CMD_TG_SEND:
186 rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout,
187 digital_send_cmd_complete, cmd);
188 break;
189
190 case DIGITAL_CMD_TG_LISTEN:
191 rc = ddev->ops->tg_listen(ddev, cmd->timeout,
192 digital_send_cmd_complete, cmd);
193 break;
194
195 case DIGITAL_CMD_TG_LISTEN_MDAA:
196 params = cmd->mdaa_params;
197
198 rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout,
199 digital_send_cmd_complete, cmd);
200 break;
201
202 default:
203 pr_err("Unknown cmd type %d\n", cmd->type);
204 return;
205 }
206
207 if (!rc)
208 return;
209
210 pr_err("in_send_command returned err %d\n", rc);
211
212 mutex_lock(&ddev->cmd_lock);
213 list_del(&cmd->queue);
214 mutex_unlock(&ddev->cmd_lock);
215
216 kfree_skb(cmd->req);
217 kfree(cmd->mdaa_params);
218 kfree(cmd);
219
220 schedule_work(&ddev->cmd_work);
221}
222
223int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
224 struct sk_buff *skb, struct digital_tg_mdaa_params *params,
225 u16 timeout, nfc_digital_cmd_complete_t cmd_cb,
226 void *cb_context)
227{
228 struct digital_cmd *cmd;
229
230 cmd = kzalloc(sizeof(struct digital_cmd), GFP_KERNEL);
231 if (!cmd)
232 return -ENOMEM;
233
234 cmd->type = cmd_type;
235 cmd->timeout = timeout;
236 cmd->req = skb;
237 cmd->mdaa_params = params;
238 cmd->cmd_cb = cmd_cb;
239 cmd->cb_context = cb_context;
240 INIT_LIST_HEAD(&cmd->queue);
241
242 mutex_lock(&ddev->cmd_lock);
243 list_add_tail(&cmd->queue, &ddev->cmd_queue);
244 mutex_unlock(&ddev->cmd_lock);
245
246 schedule_work(&ddev->cmd_work);
247
248 return 0;
249}
250
251int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
252{
253 int rc;
254
255 rc = ddev->ops->in_configure_hw(ddev, type, param);
256 if (rc)
257 pr_err("in_configure_hw failed: %d\n", rc);
258
259 return rc;
260}
261
262int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
263{
264 int rc;
265
266 rc = ddev->ops->tg_configure_hw(ddev, type, param);
267 if (rc)
268 pr_err("tg_configure_hw failed: %d\n", rc);
269
270 return rc;
271}
272
273static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
274{
275 struct digital_tg_mdaa_params *params;
276
277 params = kzalloc(sizeof(struct digital_tg_mdaa_params), GFP_KERNEL);
278 if (!params)
279 return -ENOMEM;
280
281 params->sens_res = DIGITAL_SENS_RES_NFC_DEP;
282 get_random_bytes(params->nfcid1, sizeof(params->nfcid1));
283 params->sel_res = DIGITAL_SEL_RES_NFC_DEP;
284
285 params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
286 params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
287 get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
288 params->sc = DIGITAL_SENSF_FELICA_SC;
289
290 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
291 500, digital_tg_recv_atr_req, NULL);
292}
293
294int digital_target_found(struct nfc_digital_dev *ddev,
295 struct nfc_target *target, u8 protocol)
296{
297 int rc;
298 u8 framing;
299 u8 rf_tech;
300 int (*check_crc)(struct sk_buff *skb);
301 void (*add_crc)(struct sk_buff *skb);
302
303 rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech;
304
305 switch (protocol) {
306 case NFC_PROTO_JEWEL:
307 framing = NFC_DIGITAL_FRAMING_NFCA_T1T;
308 check_crc = digital_skb_check_crc_b;
309 add_crc = digital_skb_add_crc_b;
310 break;
311
312 case NFC_PROTO_MIFARE:
313 framing = NFC_DIGITAL_FRAMING_NFCA_T2T;
314 check_crc = digital_skb_check_crc_a;
315 add_crc = digital_skb_add_crc_a;
316 break;
317
318 case NFC_PROTO_FELICA:
319 framing = NFC_DIGITAL_FRAMING_NFCF_T3T;
320 check_crc = digital_skb_check_crc_f;
321 add_crc = digital_skb_add_crc_f;
322 break;
323
324 case NFC_PROTO_NFC_DEP:
325 if (rf_tech == NFC_DIGITAL_RF_TECH_106A) {
326 framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP;
327 check_crc = digital_skb_check_crc_a;
328 add_crc = digital_skb_add_crc_a;
329 } else {
330 framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP;
331 check_crc = digital_skb_check_crc_f;
332 add_crc = digital_skb_add_crc_f;
333 }
334 break;
335
336 case NFC_PROTO_ISO15693:
337 framing = NFC_DIGITAL_FRAMING_ISO15693_T5T;
338 check_crc = digital_skb_check_crc_b;
339 add_crc = digital_skb_add_crc_b;
340 break;
341
342 case NFC_PROTO_ISO14443:
343 framing = NFC_DIGITAL_FRAMING_NFCA_T4T;
344 check_crc = digital_skb_check_crc_a;
345 add_crc = digital_skb_add_crc_a;
346 break;
347
348 default:
349 pr_err("Invalid protocol %d\n", protocol);
350 return -EINVAL;
351 }
352
353 pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);
354
355 ddev->curr_rf_tech = rf_tech;
356
357 if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
358 ddev->skb_add_crc = digital_skb_add_crc_none;
359 ddev->skb_check_crc = digital_skb_check_crc_none;
360 } else {
361 ddev->skb_add_crc = add_crc;
362 ddev->skb_check_crc = check_crc;
363 }
364
365 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing);
366 if (rc)
367 return rc;
368
369 target->supported_protocols = (1 << protocol);
370 rc = nfc_targets_found(ddev->nfc_dev, target, 1);
371 if (rc)
372 return rc;
373
374 ddev->poll_tech_count = 0;
375
376 return 0;
377}
378
379void digital_poll_next_tech(struct nfc_digital_dev *ddev)
380{
381 digital_switch_rf(ddev, 0);
382
383 mutex_lock(&ddev->poll_lock);
384
385 if (!ddev->poll_tech_count) {
386 mutex_unlock(&ddev->poll_lock);
387 return;
388 }
389
390 ddev->poll_tech_index = (ddev->poll_tech_index + 1) %
391 ddev->poll_tech_count;
392
393 mutex_unlock(&ddev->poll_lock);
394
395 schedule_work(&ddev->poll_work);
396}
397
398static void digital_wq_poll(struct work_struct *work)
399{
400 int rc;
401 struct digital_poll_tech *poll_tech;
402 struct nfc_digital_dev *ddev = container_of(work,
403 struct nfc_digital_dev,
404 poll_work);
405 mutex_lock(&ddev->poll_lock);
406
407 if (!ddev->poll_tech_count) {
408 mutex_unlock(&ddev->poll_lock);
409 return;
410 }
411
412 poll_tech = &ddev->poll_techs[ddev->poll_tech_index];
413
414 mutex_unlock(&ddev->poll_lock);
415
416 rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
417 if (rc)
418 digital_poll_next_tech(ddev);
419}
420
421static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
422 digital_poll_t poll_func)
423{
424 struct digital_poll_tech *poll_tech;
425
426 if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
427 return;
428
429 poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];
430
431 poll_tech->rf_tech = rf_tech;
432 poll_tech->poll_func = poll_func;
433}
434
435/**
436 * start_poll operation
437 *
438 * For every supported protocol, the corresponding polling function is added
439 * to the table of polling technologies (ddev->poll_techs[]) using
440 * digital_add_poll_tech().
441 * When a polling function fails (by timeout or protocol error) the next one is
442 * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
443 */
444static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
445 __u32 tm_protocols)
446{
447 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
448 u32 matching_im_protocols, matching_tm_protocols;
449
450 pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols,
451 tm_protocols, ddev->protocols);
452
453 matching_im_protocols = ddev->protocols & im_protocols;
454 matching_tm_protocols = ddev->protocols & tm_protocols;
455
456 if (!matching_im_protocols && !matching_tm_protocols) {
457 pr_err("Unknown protocol\n");
458 return -EINVAL;
459 }
460
461 if (ddev->poll_tech_count) {
462 pr_err("Already polling\n");
463 return -EBUSY;
464 }
465
466 if (ddev->curr_protocol) {
467 pr_err("A target is already active\n");
468 return -EBUSY;
469 }
470
471 ddev->poll_tech_count = 0;
472 ddev->poll_tech_index = 0;
473
474 if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
475 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
476 digital_in_send_sens_req);
477
478 if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
479 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
480 digital_in_send_sensf_req);
481
482 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
483 digital_in_send_sensf_req);
484 }
485
486 if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH)
487 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693,
488 digital_in_send_iso15693_inv_req);
489
490 if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
491 if (ddev->ops->tg_listen_mdaa) {
492 digital_add_poll_tech(ddev, 0,
493 digital_tg_listen_mdaa);
494 } else {
495 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
496 digital_tg_listen_nfca);
497
498 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
499 digital_tg_listen_nfcf);
500
501 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
502 digital_tg_listen_nfcf);
503 }
504 }
505
506 if (!ddev->poll_tech_count) {
507 pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n",
508 matching_im_protocols, matching_tm_protocols);
509 return -EINVAL;
510 }
511
512 schedule_work(&ddev->poll_work);
513
514 return 0;
515}
516
517static void digital_stop_poll(struct nfc_dev *nfc_dev)
518{
519 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
520
521 mutex_lock(&ddev->poll_lock);
522
523 if (!ddev->poll_tech_count) {
524 pr_err("Polling operation was not running\n");
525 mutex_unlock(&ddev->poll_lock);
526 return;
527 }
528
529 ddev->poll_tech_count = 0;
530
531 mutex_unlock(&ddev->poll_lock);
532
533 cancel_work_sync(&ddev->poll_work);
534
535 digital_abort_cmd(ddev);
536}
537
538static int digital_dev_up(struct nfc_dev *nfc_dev)
539{
540 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
541
542 digital_switch_rf(ddev, 1);
543
544 return 0;
545}
546
547static int digital_dev_down(struct nfc_dev *nfc_dev)
548{
549 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
550
551 digital_switch_rf(ddev, 0);
552
553 return 0;
554}
555
556static int digital_dep_link_up(struct nfc_dev *nfc_dev,
557 struct nfc_target *target,
558 __u8 comm_mode, __u8 *gb, size_t gb_len)
559{
560 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
561 int rc;
562
563 rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
564
565 if (!rc)
566 ddev->curr_protocol = NFC_PROTO_NFC_DEP;
567
568 return rc;
569}
570
571static int digital_dep_link_down(struct nfc_dev *nfc_dev)
572{
573 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
574
575 ddev->curr_protocol = 0;
576
577 return 0;
578}
579
580static int digital_activate_target(struct nfc_dev *nfc_dev,
581 struct nfc_target *target, __u32 protocol)
582{
583 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
584
585 if (ddev->poll_tech_count) {
586 pr_err("Can't activate a target while polling\n");
587 return -EBUSY;
588 }
589
590 if (ddev->curr_protocol) {
591 pr_err("A target is already active\n");
592 return -EBUSY;
593 }
594
595 ddev->curr_protocol = protocol;
596
597 return 0;
598}
599
600static void digital_deactivate_target(struct nfc_dev *nfc_dev,
601 struct nfc_target *target)
602{
603 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
604
605 if (!ddev->curr_protocol) {
606 pr_err("No active target\n");
607 return;
608 }
609
610 ddev->curr_protocol = 0;
611}
612
613static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb)
614{
615 struct nfc_digital_dev *ddev = nfc_get_drvdata(dev);
616
617 return digital_tg_send_dep_res(ddev, skb);
618}
619
620static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg,
621 struct sk_buff *resp)
622{
623 struct digital_data_exch *data_exch = arg;
624 int rc;
625
626 if (IS_ERR(resp)) {
627 rc = PTR_ERR(resp);
628 resp = NULL;
629 goto done;
630 }
631
632 if (ddev->curr_protocol == NFC_PROTO_MIFARE) {
633 rc = digital_in_recv_mifare_res(resp);
634 /* crc check is done in digital_in_recv_mifare_res() */
635 goto done;
636 }
637
638 if (ddev->curr_protocol == NFC_PROTO_ISO14443) {
639 rc = digital_in_iso_dep_pull_sod(ddev, resp);
640 if (rc)
641 goto done;
642 }
643
644 rc = ddev->skb_check_crc(resp);
645
646done:
647 if (rc) {
648 kfree_skb(resp);
649 resp = NULL;
650 }
651
652 data_exch->cb(data_exch->cb_context, resp, rc);
653
654 kfree(data_exch);
655}
656
657static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target,
658 struct sk_buff *skb, data_exchange_cb_t cb,
659 void *cb_context)
660{
661 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
662 struct digital_data_exch *data_exch;
663 int rc;
664
665 data_exch = kzalloc(sizeof(struct digital_data_exch), GFP_KERNEL);
666 if (!data_exch) {
667 pr_err("Failed to allocate data_exch struct\n");
668 return -ENOMEM;
669 }
670
671 data_exch->cb = cb;
672 data_exch->cb_context = cb_context;
673
674 if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) {
675 rc = digital_in_send_dep_req(ddev, target, skb, data_exch);
676 goto exit;
677 }
678
679 if (ddev->curr_protocol == NFC_PROTO_ISO14443) {
680 rc = digital_in_iso_dep_push_sod(ddev, skb);
681 if (rc)
682 goto exit;
683 }
684
685 ddev->skb_add_crc(skb);
686
687 rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
688 data_exch);
689
690exit:
691 if (rc)
692 kfree(data_exch);
693
694 return rc;
695}
696
697static struct nfc_ops digital_nfc_ops = {
698 .dev_up = digital_dev_up,
699 .dev_down = digital_dev_down,
700 .start_poll = digital_start_poll,
701 .stop_poll = digital_stop_poll,
702 .dep_link_up = digital_dep_link_up,
703 .dep_link_down = digital_dep_link_down,
704 .activate_target = digital_activate_target,
705 .deactivate_target = digital_deactivate_target,
706 .tm_send = digital_tg_send,
707 .im_transceive = digital_in_send,
708};
709
710struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
711 __u32 supported_protocols,
712 __u32 driver_capabilities,
713 int tx_headroom, int tx_tailroom)
714{
715 struct nfc_digital_dev *ddev;
716
717 if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen ||
718 !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd ||
719 !ops->switch_rf)
720 return NULL;
721
722 ddev = kzalloc(sizeof(struct nfc_digital_dev), GFP_KERNEL);
723 if (!ddev)
724 return NULL;
725
726 ddev->driver_capabilities = driver_capabilities;
727 ddev->ops = ops;
728
729 mutex_init(&ddev->cmd_lock);
730 INIT_LIST_HEAD(&ddev->cmd_queue);
731
732 INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
733 INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
734
735 mutex_init(&ddev->poll_lock);
736 INIT_WORK(&ddev->poll_work, digital_wq_poll);
737
738 if (supported_protocols & NFC_PROTO_JEWEL_MASK)
739 ddev->protocols |= NFC_PROTO_JEWEL_MASK;
740 if (supported_protocols & NFC_PROTO_MIFARE_MASK)
741 ddev->protocols |= NFC_PROTO_MIFARE_MASK;
742 if (supported_protocols & NFC_PROTO_FELICA_MASK)
743 ddev->protocols |= NFC_PROTO_FELICA_MASK;
744 if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
745 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
746 if (supported_protocols & NFC_PROTO_ISO15693_MASK)
747 ddev->protocols |= NFC_PROTO_ISO15693_MASK;
748 if (supported_protocols & NFC_PROTO_ISO14443_MASK)
749 ddev->protocols |= NFC_PROTO_ISO14443_MASK;
750
751 ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
752 ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
753
754 ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
755 ddev->tx_headroom,
756 ddev->tx_tailroom);
757 if (!ddev->nfc_dev) {
758 pr_err("nfc_allocate_device failed\n");
759 goto free_dev;
760 }
761
762 nfc_set_drvdata(ddev->nfc_dev, ddev);
763
764 return ddev;
765
766free_dev:
767 kfree(ddev);
768
769 return NULL;
770}
771EXPORT_SYMBOL(nfc_digital_allocate_device);
772
773void nfc_digital_free_device(struct nfc_digital_dev *ddev)
774{
775 nfc_free_device(ddev->nfc_dev);
776 kfree(ddev);
777}
778EXPORT_SYMBOL(nfc_digital_free_device);
779
780int nfc_digital_register_device(struct nfc_digital_dev *ddev)
781{
782 return nfc_register_device(ddev->nfc_dev);
783}
784EXPORT_SYMBOL(nfc_digital_register_device);
785
786void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
787{
788 struct digital_cmd *cmd, *n;
789
790 nfc_unregister_device(ddev->nfc_dev);
791
792 mutex_lock(&ddev->poll_lock);
793 ddev->poll_tech_count = 0;
794 mutex_unlock(&ddev->poll_lock);
795
796 cancel_work_sync(&ddev->poll_work);
797 cancel_work_sync(&ddev->cmd_work);
798 cancel_work_sync(&ddev->cmd_complete_work);
799
800 list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
801 list_del(&cmd->queue);
802 kfree(cmd->mdaa_params);
803 kfree(cmd);
804 }
805}
806EXPORT_SYMBOL(nfc_digital_unregister_device);
807
808MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * NFC Digital Protocol stack
4 * Copyright (c) 2013, Intel Corporation.
5 */
6
7#define pr_fmt(fmt) "digital: %s: " fmt, __func__
8
9#include <linux/module.h>
10
11#include "digital.h"
12
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)
16
17#define DIGITAL_PROTO_NFCB_RF_TECH NFC_PROTO_ISO14443_B_MASK
18
19#define DIGITAL_PROTO_NFCF_RF_TECH \
20 (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)
21
22#define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK
23
24/* Delay between each poll frame (ms) */
25#define DIGITAL_POLL_INTERVAL 10
26
27struct digital_cmd {
28 struct list_head queue;
29
30 u8 type;
31 u8 pending;
32
33 u16 timeout;
34 struct sk_buff *req;
35 struct sk_buff *resp;
36 struct digital_tg_mdaa_params *mdaa_params;
37
38 nfc_digital_cmd_complete_t cmd_cb;
39 void *cb_context;
40};
41
42struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
43 unsigned int len)
44{
45 struct sk_buff *skb;
46
47 skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom,
48 GFP_KERNEL);
49 if (skb)
50 skb_reserve(skb, ddev->tx_headroom);
51
52 return skb;
53}
54
55void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
56 u8 bitwise_inv, u8 msb_first)
57{
58 u16 crc;
59
60 crc = crc_func(init, skb->data, skb->len);
61
62 if (bitwise_inv)
63 crc = ~crc;
64
65 if (msb_first)
66 crc = __fswab16(crc);
67
68 skb_put_u8(skb, crc & 0xFF);
69 skb_put_u8(skb, (crc >> 8) & 0xFF);
70}
71
72int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
73 u16 crc_init, u8 bitwise_inv, u8 msb_first)
74{
75 int rc;
76 u16 crc;
77
78 if (skb->len <= 2)
79 return -EIO;
80
81 crc = crc_func(crc_init, skb->data, skb->len - 2);
82
83 if (bitwise_inv)
84 crc = ~crc;
85
86 if (msb_first)
87 crc = __swab16(crc);
88
89 rc = (skb->data[skb->len - 2] - (crc & 0xFF)) +
90 (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF));
91
92 if (rc)
93 return -EIO;
94
95 skb_trim(skb, skb->len - 2);
96
97 return 0;
98}
99
100static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
101{
102 ddev->ops->switch_rf(ddev, on);
103}
104
105static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
106{
107 ddev->ops->abort_cmd(ddev);
108}
109
110static void digital_wq_cmd_complete(struct work_struct *work)
111{
112 struct digital_cmd *cmd;
113 struct nfc_digital_dev *ddev = container_of(work,
114 struct nfc_digital_dev,
115 cmd_complete_work);
116
117 mutex_lock(&ddev->cmd_lock);
118
119 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
120 queue);
121 if (!cmd) {
122 mutex_unlock(&ddev->cmd_lock);
123 return;
124 }
125
126 list_del(&cmd->queue);
127
128 mutex_unlock(&ddev->cmd_lock);
129
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);
133
134 cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp);
135
136 kfree(cmd->mdaa_params);
137 kfree(cmd);
138
139 schedule_work(&ddev->cmd_work);
140}
141
142static void digital_send_cmd_complete(struct nfc_digital_dev *ddev,
143 void *arg, struct sk_buff *resp)
144{
145 struct digital_cmd *cmd = arg;
146
147 cmd->resp = resp;
148
149 schedule_work(&ddev->cmd_complete_work);
150}
151
152static void digital_wq_cmd(struct work_struct *work)
153{
154 int rc;
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,
159 cmd_work);
160
161 mutex_lock(&ddev->cmd_lock);
162
163 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
164 queue);
165 if (!cmd || cmd->pending) {
166 mutex_unlock(&ddev->cmd_lock);
167 return;
168 }
169
170 cmd->pending = 1;
171
172 mutex_unlock(&ddev->cmd_lock);
173
174 if (cmd->req)
175 print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1,
176 cmd->req->data, cmd->req->len, false);
177
178 switch (cmd->type) {
179 case DIGITAL_CMD_IN_SEND:
180 rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout,
181 digital_send_cmd_complete, cmd);
182 break;
183
184 case DIGITAL_CMD_TG_SEND:
185 rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout,
186 digital_send_cmd_complete, cmd);
187 break;
188
189 case DIGITAL_CMD_TG_LISTEN:
190 rc = ddev->ops->tg_listen(ddev, cmd->timeout,
191 digital_send_cmd_complete, cmd);
192 break;
193
194 case DIGITAL_CMD_TG_LISTEN_MDAA:
195 params = cmd->mdaa_params;
196
197 rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout,
198 digital_send_cmd_complete, cmd);
199 break;
200
201 case DIGITAL_CMD_TG_LISTEN_MD:
202 rc = ddev->ops->tg_listen_md(ddev, cmd->timeout,
203 digital_send_cmd_complete, cmd);
204 break;
205
206 default:
207 pr_err("Unknown cmd type %d\n", cmd->type);
208 return;
209 }
210
211 if (!rc)
212 return;
213
214 pr_err("in_send_command returned err %d\n", rc);
215
216 mutex_lock(&ddev->cmd_lock);
217 list_del(&cmd->queue);
218 mutex_unlock(&ddev->cmd_lock);
219
220 kfree_skb(cmd->req);
221 kfree(cmd->mdaa_params);
222 kfree(cmd);
223
224 schedule_work(&ddev->cmd_work);
225}
226
227int 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,
230 void *cb_context)
231{
232 struct digital_cmd *cmd;
233
234 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
235 if (!cmd)
236 return -ENOMEM;
237
238 cmd->type = cmd_type;
239 cmd->timeout = timeout;
240 cmd->req = skb;
241 cmd->mdaa_params = params;
242 cmd->cmd_cb = cmd_cb;
243 cmd->cb_context = cb_context;
244 INIT_LIST_HEAD(&cmd->queue);
245
246 mutex_lock(&ddev->cmd_lock);
247 list_add_tail(&cmd->queue, &ddev->cmd_queue);
248 mutex_unlock(&ddev->cmd_lock);
249
250 schedule_work(&ddev->cmd_work);
251
252 return 0;
253}
254
255int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
256{
257 int rc;
258
259 rc = ddev->ops->in_configure_hw(ddev, type, param);
260 if (rc)
261 pr_err("in_configure_hw failed: %d\n", rc);
262
263 return rc;
264}
265
266int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
267{
268 int rc;
269
270 rc = ddev->ops->tg_configure_hw(ddev, type, param);
271 if (rc)
272 pr_err("tg_configure_hw failed: %d\n", rc);
273
274 return rc;
275}
276
277static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
278{
279 struct digital_tg_mdaa_params *params;
280 int rc;
281
282 params = kzalloc(sizeof(*params), GFP_KERNEL);
283 if (!params)
284 return -ENOMEM;
285
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;
289
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;
294
295 rc = digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
296 500, digital_tg_recv_atr_req, NULL);
297 if (rc)
298 kfree(params);
299
300 return rc;
301}
302
303static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech)
304{
305 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, 500,
306 digital_tg_recv_md_req, NULL);
307}
308
309int digital_target_found(struct nfc_digital_dev *ddev,
310 struct nfc_target *target, u8 protocol)
311{
312 int rc;
313 u8 framing;
314 u8 rf_tech;
315 u8 poll_tech_count;
316 int (*check_crc)(struct sk_buff *skb);
317 void (*add_crc)(struct sk_buff *skb);
318
319 rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech;
320
321 switch (protocol) {
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;
326 break;
327
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;
332 break;
333
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;
338 break;
339
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;
345 } else {
346 framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP;
347 check_crc = digital_skb_check_crc_f;
348 add_crc = digital_skb_add_crc_f;
349 }
350 break;
351
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;
356 break;
357
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;
362 break;
363
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;
368 break;
369
370 default:
371 pr_err("Invalid protocol %d\n", protocol);
372 return -EINVAL;
373 }
374
375 pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);
376
377 ddev->curr_rf_tech = rf_tech;
378
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;
382 } else {
383 ddev->skb_add_crc = add_crc;
384 ddev->skb_check_crc = check_crc;
385 }
386
387 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing);
388 if (rc)
389 return rc;
390
391 target->supported_protocols = (1 << protocol);
392
393 poll_tech_count = ddev->poll_tech_count;
394 ddev->poll_tech_count = 0;
395
396 rc = nfc_targets_found(ddev->nfc_dev, target, 1);
397 if (rc) {
398 ddev->poll_tech_count = poll_tech_count;
399 return rc;
400 }
401
402 return 0;
403}
404
405void digital_poll_next_tech(struct nfc_digital_dev *ddev)
406{
407 u8 rand_mod;
408
409 digital_switch_rf(ddev, 0);
410
411 mutex_lock(&ddev->poll_lock);
412
413 if (!ddev->poll_tech_count) {
414 mutex_unlock(&ddev->poll_lock);
415 return;
416 }
417
418 get_random_bytes(&rand_mod, sizeof(rand_mod));
419 ddev->poll_tech_index = rand_mod % ddev->poll_tech_count;
420
421 mutex_unlock(&ddev->poll_lock);
422
423 schedule_delayed_work(&ddev->poll_work,
424 msecs_to_jiffies(DIGITAL_POLL_INTERVAL));
425}
426
427static void digital_wq_poll(struct work_struct *work)
428{
429 int rc;
430 struct digital_poll_tech *poll_tech;
431 struct nfc_digital_dev *ddev = container_of(work,
432 struct nfc_digital_dev,
433 poll_work.work);
434 mutex_lock(&ddev->poll_lock);
435
436 if (!ddev->poll_tech_count) {
437 mutex_unlock(&ddev->poll_lock);
438 return;
439 }
440
441 poll_tech = &ddev->poll_techs[ddev->poll_tech_index];
442
443 mutex_unlock(&ddev->poll_lock);
444
445 rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
446 if (rc)
447 digital_poll_next_tech(ddev);
448}
449
450static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
451 digital_poll_t poll_func)
452{
453 struct digital_poll_tech *poll_tech;
454
455 if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
456 return;
457
458 poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];
459
460 poll_tech->rf_tech = rf_tech;
461 poll_tech->poll_func = poll_func;
462}
463
464/**
465 * digital_start_poll - start_poll operation
466 * @nfc_dev: device to be polled
467 * @im_protocols: bitset of nfc initiator protocols to be used for polling
468 * @tm_protocols: bitset of nfc transport protocols to be used for polling
469 *
470 * For every supported protocol, the corresponding polling function is added
471 * to the table of polling technologies (ddev->poll_techs[]) using
472 * digital_add_poll_tech().
473 * When a polling function fails (by timeout or protocol error) the next one is
474 * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
475 */
476static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
477 __u32 tm_protocols)
478{
479 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
480 u32 matching_im_protocols, matching_tm_protocols;
481
482 pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols,
483 tm_protocols, ddev->protocols);
484
485 matching_im_protocols = ddev->protocols & im_protocols;
486 matching_tm_protocols = ddev->protocols & tm_protocols;
487
488 if (!matching_im_protocols && !matching_tm_protocols) {
489 pr_err("Unknown protocol\n");
490 return -EINVAL;
491 }
492
493 if (ddev->poll_tech_count) {
494 pr_err("Already polling\n");
495 return -EBUSY;
496 }
497
498 if (ddev->curr_protocol) {
499 pr_err("A target is already active\n");
500 return -EBUSY;
501 }
502
503 ddev->poll_tech_count = 0;
504 ddev->poll_tech_index = 0;
505
506 if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
507 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
508 digital_in_send_sens_req);
509
510 if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH)
511 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B,
512 digital_in_send_sensb_req);
513
514 if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
515 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
516 digital_in_send_sensf_req);
517
518 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
519 digital_in_send_sensf_req);
520 }
521
522 if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH)
523 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693,
524 digital_in_send_iso15693_inv_req);
525
526 if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
527 if (ddev->ops->tg_listen_mdaa) {
528 digital_add_poll_tech(ddev, 0,
529 digital_tg_listen_mdaa);
530 } else if (ddev->ops->tg_listen_md) {
531 digital_add_poll_tech(ddev, 0,
532 digital_tg_listen_md);
533 } else {
534 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
535 digital_tg_listen_nfca);
536
537 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
538 digital_tg_listen_nfcf);
539
540 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
541 digital_tg_listen_nfcf);
542 }
543 }
544
545 if (!ddev->poll_tech_count) {
546 pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n",
547 matching_im_protocols, matching_tm_protocols);
548 return -EINVAL;
549 }
550
551 schedule_delayed_work(&ddev->poll_work, 0);
552
553 return 0;
554}
555
556static void digital_stop_poll(struct nfc_dev *nfc_dev)
557{
558 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
559
560 mutex_lock(&ddev->poll_lock);
561
562 if (!ddev->poll_tech_count) {
563 pr_err("Polling operation was not running\n");
564 mutex_unlock(&ddev->poll_lock);
565 return;
566 }
567
568 ddev->poll_tech_count = 0;
569
570 mutex_unlock(&ddev->poll_lock);
571
572 cancel_delayed_work_sync(&ddev->poll_work);
573
574 digital_abort_cmd(ddev);
575}
576
577static int digital_dev_up(struct nfc_dev *nfc_dev)
578{
579 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
580
581 digital_switch_rf(ddev, 1);
582
583 return 0;
584}
585
586static int digital_dev_down(struct nfc_dev *nfc_dev)
587{
588 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
589
590 digital_switch_rf(ddev, 0);
591
592 return 0;
593}
594
595static int digital_dep_link_up(struct nfc_dev *nfc_dev,
596 struct nfc_target *target,
597 __u8 comm_mode, __u8 *gb, size_t gb_len)
598{
599 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
600 int rc;
601
602 rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
603
604 if (!rc)
605 ddev->curr_protocol = NFC_PROTO_NFC_DEP;
606
607 return rc;
608}
609
610static int digital_dep_link_down(struct nfc_dev *nfc_dev)
611{
612 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
613
614 digital_abort_cmd(ddev);
615
616 ddev->curr_protocol = 0;
617
618 return 0;
619}
620
621static int digital_activate_target(struct nfc_dev *nfc_dev,
622 struct nfc_target *target, __u32 protocol)
623{
624 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
625
626 if (ddev->poll_tech_count) {
627 pr_err("Can't activate a target while polling\n");
628 return -EBUSY;
629 }
630
631 if (ddev->curr_protocol) {
632 pr_err("A target is already active\n");
633 return -EBUSY;
634 }
635
636 ddev->curr_protocol = protocol;
637
638 return 0;
639}
640
641static void digital_deactivate_target(struct nfc_dev *nfc_dev,
642 struct nfc_target *target,
643 u8 mode)
644{
645 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
646
647 if (!ddev->curr_protocol) {
648 pr_err("No active target\n");
649 return;
650 }
651
652 digital_abort_cmd(ddev);
653 ddev->curr_protocol = 0;
654}
655
656static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb)
657{
658 struct nfc_digital_dev *ddev = nfc_get_drvdata(dev);
659
660 return digital_tg_send_dep_res(ddev, skb);
661}
662
663static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg,
664 struct sk_buff *resp)
665{
666 struct digital_data_exch *data_exch = arg;
667 int rc;
668
669 if (IS_ERR(resp)) {
670 rc = PTR_ERR(resp);
671 resp = NULL;
672 goto done;
673 }
674
675 if (ddev->curr_protocol == NFC_PROTO_MIFARE) {
676 rc = digital_in_recv_mifare_res(resp);
677 /* crc check is done in digital_in_recv_mifare_res() */
678 goto done;
679 }
680
681 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
682 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
683 rc = digital_in_iso_dep_pull_sod(ddev, resp);
684 if (rc)
685 goto done;
686 }
687
688 rc = ddev->skb_check_crc(resp);
689
690done:
691 if (rc) {
692 kfree_skb(resp);
693 resp = NULL;
694 }
695
696 data_exch->cb(data_exch->cb_context, resp, rc);
697
698 kfree(data_exch);
699}
700
701static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target,
702 struct sk_buff *skb, data_exchange_cb_t cb,
703 void *cb_context)
704{
705 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
706 struct digital_data_exch *data_exch;
707 int rc;
708
709 data_exch = kzalloc(sizeof(*data_exch), GFP_KERNEL);
710 if (!data_exch)
711 return -ENOMEM;
712
713 data_exch->cb = cb;
714 data_exch->cb_context = cb_context;
715
716 if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) {
717 rc = digital_in_send_dep_req(ddev, target, skb, data_exch);
718 goto exit;
719 }
720
721 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
722 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
723 rc = digital_in_iso_dep_push_sod(ddev, skb);
724 if (rc)
725 goto exit;
726 }
727
728 ddev->skb_add_crc(skb);
729
730 rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
731 data_exch);
732
733exit:
734 if (rc)
735 kfree(data_exch);
736
737 return rc;
738}
739
740static const struct nfc_ops digital_nfc_ops = {
741 .dev_up = digital_dev_up,
742 .dev_down = digital_dev_down,
743 .start_poll = digital_start_poll,
744 .stop_poll = digital_stop_poll,
745 .dep_link_up = digital_dep_link_up,
746 .dep_link_down = digital_dep_link_down,
747 .activate_target = digital_activate_target,
748 .deactivate_target = digital_deactivate_target,
749 .tm_send = digital_tg_send,
750 .im_transceive = digital_in_send,
751};
752
753struct nfc_digital_dev *nfc_digital_allocate_device(const struct nfc_digital_ops *ops,
754 __u32 supported_protocols,
755 __u32 driver_capabilities,
756 int tx_headroom, int tx_tailroom)
757{
758 struct nfc_digital_dev *ddev;
759
760 if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen ||
761 !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd ||
762 !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech))
763 return NULL;
764
765 ddev = kzalloc(sizeof(*ddev), GFP_KERNEL);
766 if (!ddev)
767 return NULL;
768
769 ddev->driver_capabilities = driver_capabilities;
770 ddev->ops = ops;
771
772 mutex_init(&ddev->cmd_lock);
773 INIT_LIST_HEAD(&ddev->cmd_queue);
774
775 INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
776 INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
777
778 mutex_init(&ddev->poll_lock);
779 INIT_DELAYED_WORK(&ddev->poll_work, digital_wq_poll);
780
781 if (supported_protocols & NFC_PROTO_JEWEL_MASK)
782 ddev->protocols |= NFC_PROTO_JEWEL_MASK;
783 if (supported_protocols & NFC_PROTO_MIFARE_MASK)
784 ddev->protocols |= NFC_PROTO_MIFARE_MASK;
785 if (supported_protocols & NFC_PROTO_FELICA_MASK)
786 ddev->protocols |= NFC_PROTO_FELICA_MASK;
787 if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
788 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
789 if (supported_protocols & NFC_PROTO_ISO15693_MASK)
790 ddev->protocols |= NFC_PROTO_ISO15693_MASK;
791 if (supported_protocols & NFC_PROTO_ISO14443_MASK)
792 ddev->protocols |= NFC_PROTO_ISO14443_MASK;
793 if (supported_protocols & NFC_PROTO_ISO14443_B_MASK)
794 ddev->protocols |= NFC_PROTO_ISO14443_B_MASK;
795
796 ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
797 ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
798
799 ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
800 ddev->tx_headroom,
801 ddev->tx_tailroom);
802 if (!ddev->nfc_dev) {
803 pr_err("nfc_allocate_device failed\n");
804 goto free_dev;
805 }
806
807 nfc_set_drvdata(ddev->nfc_dev, ddev);
808
809 return ddev;
810
811free_dev:
812 kfree(ddev);
813
814 return NULL;
815}
816EXPORT_SYMBOL(nfc_digital_allocate_device);
817
818void nfc_digital_free_device(struct nfc_digital_dev *ddev)
819{
820 nfc_free_device(ddev->nfc_dev);
821 kfree(ddev);
822}
823EXPORT_SYMBOL(nfc_digital_free_device);
824
825int nfc_digital_register_device(struct nfc_digital_dev *ddev)
826{
827 return nfc_register_device(ddev->nfc_dev);
828}
829EXPORT_SYMBOL(nfc_digital_register_device);
830
831void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
832{
833 struct digital_cmd *cmd, *n;
834
835 nfc_unregister_device(ddev->nfc_dev);
836
837 mutex_lock(&ddev->poll_lock);
838 ddev->poll_tech_count = 0;
839 mutex_unlock(&ddev->poll_lock);
840
841 cancel_delayed_work_sync(&ddev->poll_work);
842 cancel_work_sync(&ddev->cmd_work);
843 cancel_work_sync(&ddev->cmd_complete_work);
844
845 list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
846 list_del(&cmd->queue);
847
848 /* Call the command callback if any and pass it a ENODEV error.
849 * This gives a chance to the command issuer to free any
850 * allocated buffer.
851 */
852 if (cmd->cmd_cb)
853 cmd->cmd_cb(ddev, cmd->cb_context, ERR_PTR(-ENODEV));
854
855 kfree(cmd->mdaa_params);
856 kfree(cmd);
857 }
858}
859EXPORT_SYMBOL(nfc_digital_unregister_device);
860
861MODULE_DESCRIPTION("NFC Digital protocol stack");
862MODULE_LICENSE("GPL");