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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 | \
24 NFC_PROTO_NFC_DEP_MASK | NFC_PROTO_ISO14443_MASK)
25
26#define DIGITAL_PROTO_NFCB_RF_TECH NFC_PROTO_ISO14443_B_MASK
27
28#define DIGITAL_PROTO_NFCF_RF_TECH \
29 (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)
30
31#define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK
32
33/* Delay between each poll frame (ms) */
34#define DIGITAL_POLL_INTERVAL 10
35
36struct digital_cmd {
37 struct list_head queue;
38
39 u8 type;
40 u8 pending;
41
42 u16 timeout;
43 struct sk_buff *req;
44 struct sk_buff *resp;
45 struct digital_tg_mdaa_params *mdaa_params;
46
47 nfc_digital_cmd_complete_t cmd_cb;
48 void *cb_context;
49};
50
51struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
52 unsigned int len)
53{
54 struct sk_buff *skb;
55
56 skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom,
57 GFP_KERNEL);
58 if (skb)
59 skb_reserve(skb, ddev->tx_headroom);
60
61 return skb;
62}
63
64void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
65 u8 bitwise_inv, u8 msb_first)
66{
67 u16 crc;
68
69 crc = crc_func(init, skb->data, skb->len);
70
71 if (bitwise_inv)
72 crc = ~crc;
73
74 if (msb_first)
75 crc = __fswab16(crc);
76
77 *skb_put(skb, 1) = crc & 0xFF;
78 *skb_put(skb, 1) = (crc >> 8) & 0xFF;
79}
80
81int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
82 u16 crc_init, u8 bitwise_inv, u8 msb_first)
83{
84 int rc;
85 u16 crc;
86
87 if (skb->len <= 2)
88 return -EIO;
89
90 crc = crc_func(crc_init, skb->data, skb->len - 2);
91
92 if (bitwise_inv)
93 crc = ~crc;
94
95 if (msb_first)
96 crc = __swab16(crc);
97
98 rc = (skb->data[skb->len - 2] - (crc & 0xFF)) +
99 (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF));
100
101 if (rc)
102 return -EIO;
103
104 skb_trim(skb, skb->len - 2);
105
106 return 0;
107}
108
109static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
110{
111 ddev->ops->switch_rf(ddev, on);
112}
113
114static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
115{
116 ddev->ops->abort_cmd(ddev);
117}
118
119static void digital_wq_cmd_complete(struct work_struct *work)
120{
121 struct digital_cmd *cmd;
122 struct nfc_digital_dev *ddev = container_of(work,
123 struct nfc_digital_dev,
124 cmd_complete_work);
125
126 mutex_lock(&ddev->cmd_lock);
127
128 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
129 queue);
130 if (!cmd) {
131 mutex_unlock(&ddev->cmd_lock);
132 return;
133 }
134
135 list_del(&cmd->queue);
136
137 mutex_unlock(&ddev->cmd_lock);
138
139 if (!IS_ERR(cmd->resp))
140 print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1,
141 cmd->resp->data, cmd->resp->len, false);
142
143 cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp);
144
145 kfree(cmd->mdaa_params);
146 kfree(cmd);
147
148 schedule_work(&ddev->cmd_work);
149}
150
151static void digital_send_cmd_complete(struct nfc_digital_dev *ddev,
152 void *arg, struct sk_buff *resp)
153{
154 struct digital_cmd *cmd = arg;
155
156 cmd->resp = resp;
157
158 schedule_work(&ddev->cmd_complete_work);
159}
160
161static void digital_wq_cmd(struct work_struct *work)
162{
163 int rc;
164 struct digital_cmd *cmd;
165 struct digital_tg_mdaa_params *params;
166 struct nfc_digital_dev *ddev = container_of(work,
167 struct nfc_digital_dev,
168 cmd_work);
169
170 mutex_lock(&ddev->cmd_lock);
171
172 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
173 queue);
174 if (!cmd || cmd->pending) {
175 mutex_unlock(&ddev->cmd_lock);
176 return;
177 }
178
179 cmd->pending = 1;
180
181 mutex_unlock(&ddev->cmd_lock);
182
183 if (cmd->req)
184 print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1,
185 cmd->req->data, cmd->req->len, false);
186
187 switch (cmd->type) {
188 case DIGITAL_CMD_IN_SEND:
189 rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout,
190 digital_send_cmd_complete, cmd);
191 break;
192
193 case DIGITAL_CMD_TG_SEND:
194 rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout,
195 digital_send_cmd_complete, cmd);
196 break;
197
198 case DIGITAL_CMD_TG_LISTEN:
199 rc = ddev->ops->tg_listen(ddev, cmd->timeout,
200 digital_send_cmd_complete, cmd);
201 break;
202
203 case DIGITAL_CMD_TG_LISTEN_MDAA:
204 params = cmd->mdaa_params;
205
206 rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout,
207 digital_send_cmd_complete, cmd);
208 break;
209
210 case DIGITAL_CMD_TG_LISTEN_MD:
211 rc = ddev->ops->tg_listen_md(ddev, cmd->timeout,
212 digital_send_cmd_complete, cmd);
213 break;
214
215 default:
216 pr_err("Unknown cmd type %d\n", cmd->type);
217 return;
218 }
219
220 if (!rc)
221 return;
222
223 pr_err("in_send_command returned err %d\n", rc);
224
225 mutex_lock(&ddev->cmd_lock);
226 list_del(&cmd->queue);
227 mutex_unlock(&ddev->cmd_lock);
228
229 kfree_skb(cmd->req);
230 kfree(cmd->mdaa_params);
231 kfree(cmd);
232
233 schedule_work(&ddev->cmd_work);
234}
235
236int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
237 struct sk_buff *skb, struct digital_tg_mdaa_params *params,
238 u16 timeout, nfc_digital_cmd_complete_t cmd_cb,
239 void *cb_context)
240{
241 struct digital_cmd *cmd;
242
243 cmd = kzalloc(sizeof(struct digital_cmd), GFP_KERNEL);
244 if (!cmd)
245 return -ENOMEM;
246
247 cmd->type = cmd_type;
248 cmd->timeout = timeout;
249 cmd->req = skb;
250 cmd->mdaa_params = params;
251 cmd->cmd_cb = cmd_cb;
252 cmd->cb_context = cb_context;
253 INIT_LIST_HEAD(&cmd->queue);
254
255 mutex_lock(&ddev->cmd_lock);
256 list_add_tail(&cmd->queue, &ddev->cmd_queue);
257 mutex_unlock(&ddev->cmd_lock);
258
259 schedule_work(&ddev->cmd_work);
260
261 return 0;
262}
263
264int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
265{
266 int rc;
267
268 rc = ddev->ops->in_configure_hw(ddev, type, param);
269 if (rc)
270 pr_err("in_configure_hw failed: %d\n", rc);
271
272 return rc;
273}
274
275int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
276{
277 int rc;
278
279 rc = ddev->ops->tg_configure_hw(ddev, type, param);
280 if (rc)
281 pr_err("tg_configure_hw failed: %d\n", rc);
282
283 return rc;
284}
285
286static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
287{
288 struct digital_tg_mdaa_params *params;
289
290 params = kzalloc(sizeof(struct digital_tg_mdaa_params), GFP_KERNEL);
291 if (!params)
292 return -ENOMEM;
293
294 params->sens_res = DIGITAL_SENS_RES_NFC_DEP;
295 get_random_bytes(params->nfcid1, sizeof(params->nfcid1));
296 params->sel_res = DIGITAL_SEL_RES_NFC_DEP;
297
298 params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
299 params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
300 get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
301 params->sc = DIGITAL_SENSF_FELICA_SC;
302
303 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
304 500, digital_tg_recv_atr_req, NULL);
305}
306
307static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech)
308{
309 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, 500,
310 digital_tg_recv_md_req, NULL);
311}
312
313int digital_target_found(struct nfc_digital_dev *ddev,
314 struct nfc_target *target, u8 protocol)
315{
316 int rc;
317 u8 framing;
318 u8 rf_tech;
319 u8 poll_tech_count;
320 int (*check_crc)(struct sk_buff *skb);
321 void (*add_crc)(struct sk_buff *skb);
322
323 rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech;
324
325 switch (protocol) {
326 case NFC_PROTO_JEWEL:
327 framing = NFC_DIGITAL_FRAMING_NFCA_T1T;
328 check_crc = digital_skb_check_crc_b;
329 add_crc = digital_skb_add_crc_b;
330 break;
331
332 case NFC_PROTO_MIFARE:
333 framing = NFC_DIGITAL_FRAMING_NFCA_T2T;
334 check_crc = digital_skb_check_crc_a;
335 add_crc = digital_skb_add_crc_a;
336 break;
337
338 case NFC_PROTO_FELICA:
339 framing = NFC_DIGITAL_FRAMING_NFCF_T3T;
340 check_crc = digital_skb_check_crc_f;
341 add_crc = digital_skb_add_crc_f;
342 break;
343
344 case NFC_PROTO_NFC_DEP:
345 if (rf_tech == NFC_DIGITAL_RF_TECH_106A) {
346 framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP;
347 check_crc = digital_skb_check_crc_a;
348 add_crc = digital_skb_add_crc_a;
349 } else {
350 framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP;
351 check_crc = digital_skb_check_crc_f;
352 add_crc = digital_skb_add_crc_f;
353 }
354 break;
355
356 case NFC_PROTO_ISO15693:
357 framing = NFC_DIGITAL_FRAMING_ISO15693_T5T;
358 check_crc = digital_skb_check_crc_b;
359 add_crc = digital_skb_add_crc_b;
360 break;
361
362 case NFC_PROTO_ISO14443:
363 framing = NFC_DIGITAL_FRAMING_NFCA_T4T;
364 check_crc = digital_skb_check_crc_a;
365 add_crc = digital_skb_add_crc_a;
366 break;
367
368 case NFC_PROTO_ISO14443_B:
369 framing = NFC_DIGITAL_FRAMING_NFCB_T4T;
370 check_crc = digital_skb_check_crc_b;
371 add_crc = digital_skb_add_crc_b;
372 break;
373
374 default:
375 pr_err("Invalid protocol %d\n", protocol);
376 return -EINVAL;
377 }
378
379 pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);
380
381 ddev->curr_rf_tech = rf_tech;
382
383 if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
384 ddev->skb_add_crc = digital_skb_add_crc_none;
385 ddev->skb_check_crc = digital_skb_check_crc_none;
386 } else {
387 ddev->skb_add_crc = add_crc;
388 ddev->skb_check_crc = check_crc;
389 }
390
391 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing);
392 if (rc)
393 return rc;
394
395 target->supported_protocols = (1 << protocol);
396
397 poll_tech_count = ddev->poll_tech_count;
398 ddev->poll_tech_count = 0;
399
400 rc = nfc_targets_found(ddev->nfc_dev, target, 1);
401 if (rc) {
402 ddev->poll_tech_count = poll_tech_count;
403 return rc;
404 }
405
406 return 0;
407}
408
409void digital_poll_next_tech(struct nfc_digital_dev *ddev)
410{
411 u8 rand_mod;
412
413 digital_switch_rf(ddev, 0);
414
415 mutex_lock(&ddev->poll_lock);
416
417 if (!ddev->poll_tech_count) {
418 mutex_unlock(&ddev->poll_lock);
419 return;
420 }
421
422 get_random_bytes(&rand_mod, sizeof(rand_mod));
423 ddev->poll_tech_index = rand_mod % ddev->poll_tech_count;
424
425 mutex_unlock(&ddev->poll_lock);
426
427 schedule_delayed_work(&ddev->poll_work,
428 msecs_to_jiffies(DIGITAL_POLL_INTERVAL));
429}
430
431static void digital_wq_poll(struct work_struct *work)
432{
433 int rc;
434 struct digital_poll_tech *poll_tech;
435 struct nfc_digital_dev *ddev = container_of(work,
436 struct nfc_digital_dev,
437 poll_work.work);
438 mutex_lock(&ddev->poll_lock);
439
440 if (!ddev->poll_tech_count) {
441 mutex_unlock(&ddev->poll_lock);
442 return;
443 }
444
445 poll_tech = &ddev->poll_techs[ddev->poll_tech_index];
446
447 mutex_unlock(&ddev->poll_lock);
448
449 rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
450 if (rc)
451 digital_poll_next_tech(ddev);
452}
453
454static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
455 digital_poll_t poll_func)
456{
457 struct digital_poll_tech *poll_tech;
458
459 if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
460 return;
461
462 poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];
463
464 poll_tech->rf_tech = rf_tech;
465 poll_tech->poll_func = poll_func;
466}
467
468/**
469 * start_poll operation
470 *
471 * For every supported protocol, the corresponding polling function is added
472 * to the table of polling technologies (ddev->poll_techs[]) using
473 * digital_add_poll_tech().
474 * When a polling function fails (by timeout or protocol error) the next one is
475 * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
476 */
477static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
478 __u32 tm_protocols)
479{
480 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
481 u32 matching_im_protocols, matching_tm_protocols;
482
483 pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols,
484 tm_protocols, ddev->protocols);
485
486 matching_im_protocols = ddev->protocols & im_protocols;
487 matching_tm_protocols = ddev->protocols & tm_protocols;
488
489 if (!matching_im_protocols && !matching_tm_protocols) {
490 pr_err("Unknown protocol\n");
491 return -EINVAL;
492 }
493
494 if (ddev->poll_tech_count) {
495 pr_err("Already polling\n");
496 return -EBUSY;
497 }
498
499 if (ddev->curr_protocol) {
500 pr_err("A target is already active\n");
501 return -EBUSY;
502 }
503
504 ddev->poll_tech_count = 0;
505 ddev->poll_tech_index = 0;
506
507 if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
508 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
509 digital_in_send_sens_req);
510
511 if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH)
512 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B,
513 digital_in_send_sensb_req);
514
515 if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
516 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
517 digital_in_send_sensf_req);
518
519 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
520 digital_in_send_sensf_req);
521 }
522
523 if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH)
524 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693,
525 digital_in_send_iso15693_inv_req);
526
527 if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
528 if (ddev->ops->tg_listen_mdaa) {
529 digital_add_poll_tech(ddev, 0,
530 digital_tg_listen_mdaa);
531 } else if (ddev->ops->tg_listen_md) {
532 digital_add_poll_tech(ddev, 0,
533 digital_tg_listen_md);
534 } else {
535 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
536 digital_tg_listen_nfca);
537
538 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
539 digital_tg_listen_nfcf);
540
541 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
542 digital_tg_listen_nfcf);
543 }
544 }
545
546 if (!ddev->poll_tech_count) {
547 pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n",
548 matching_im_protocols, matching_tm_protocols);
549 return -EINVAL;
550 }
551
552 schedule_delayed_work(&ddev->poll_work, 0);
553
554 return 0;
555}
556
557static void digital_stop_poll(struct nfc_dev *nfc_dev)
558{
559 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
560
561 mutex_lock(&ddev->poll_lock);
562
563 if (!ddev->poll_tech_count) {
564 pr_err("Polling operation was not running\n");
565 mutex_unlock(&ddev->poll_lock);
566 return;
567 }
568
569 ddev->poll_tech_count = 0;
570
571 mutex_unlock(&ddev->poll_lock);
572
573 cancel_delayed_work_sync(&ddev->poll_work);
574
575 digital_abort_cmd(ddev);
576}
577
578static int digital_dev_up(struct nfc_dev *nfc_dev)
579{
580 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
581
582 digital_switch_rf(ddev, 1);
583
584 return 0;
585}
586
587static int digital_dev_down(struct nfc_dev *nfc_dev)
588{
589 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
590
591 digital_switch_rf(ddev, 0);
592
593 return 0;
594}
595
596static int digital_dep_link_up(struct nfc_dev *nfc_dev,
597 struct nfc_target *target,
598 __u8 comm_mode, __u8 *gb, size_t gb_len)
599{
600 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
601 int rc;
602
603 rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
604
605 if (!rc)
606 ddev->curr_protocol = NFC_PROTO_NFC_DEP;
607
608 return rc;
609}
610
611static int digital_dep_link_down(struct nfc_dev *nfc_dev)
612{
613 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
614
615 digital_abort_cmd(ddev);
616
617 ddev->curr_protocol = 0;
618
619 return 0;
620}
621
622static int digital_activate_target(struct nfc_dev *nfc_dev,
623 struct nfc_target *target, __u32 protocol)
624{
625 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
626
627 if (ddev->poll_tech_count) {
628 pr_err("Can't activate a target while polling\n");
629 return -EBUSY;
630 }
631
632 if (ddev->curr_protocol) {
633 pr_err("A target is already active\n");
634 return -EBUSY;
635 }
636
637 ddev->curr_protocol = protocol;
638
639 return 0;
640}
641
642static void digital_deactivate_target(struct nfc_dev *nfc_dev,
643 struct nfc_target *target,
644 u8 mode)
645{
646 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
647
648 if (!ddev->curr_protocol) {
649 pr_err("No active target\n");
650 return;
651 }
652
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(struct digital_data_exch), GFP_KERNEL);
710 if (!data_exch) {
711 pr_err("Failed to allocate data_exch struct\n");
712 return -ENOMEM;
713 }
714
715 data_exch->cb = cb;
716 data_exch->cb_context = cb_context;
717
718 if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) {
719 rc = digital_in_send_dep_req(ddev, target, skb, data_exch);
720 goto exit;
721 }
722
723 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
724 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
725 rc = digital_in_iso_dep_push_sod(ddev, skb);
726 if (rc)
727 goto exit;
728 }
729
730 ddev->skb_add_crc(skb);
731
732 rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
733 data_exch);
734
735exit:
736 if (rc)
737 kfree(data_exch);
738
739 return rc;
740}
741
742static struct nfc_ops digital_nfc_ops = {
743 .dev_up = digital_dev_up,
744 .dev_down = digital_dev_down,
745 .start_poll = digital_start_poll,
746 .stop_poll = digital_stop_poll,
747 .dep_link_up = digital_dep_link_up,
748 .dep_link_down = digital_dep_link_down,
749 .activate_target = digital_activate_target,
750 .deactivate_target = digital_deactivate_target,
751 .tm_send = digital_tg_send,
752 .im_transceive = digital_in_send,
753};
754
755struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
756 __u32 supported_protocols,
757 __u32 driver_capabilities,
758 int tx_headroom, int tx_tailroom)
759{
760 struct nfc_digital_dev *ddev;
761
762 if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen ||
763 !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd ||
764 !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech))
765 return NULL;
766
767 ddev = kzalloc(sizeof(struct nfc_digital_dev), GFP_KERNEL);
768 if (!ddev)
769 return NULL;
770
771 ddev->driver_capabilities = driver_capabilities;
772 ddev->ops = ops;
773
774 mutex_init(&ddev->cmd_lock);
775 INIT_LIST_HEAD(&ddev->cmd_queue);
776
777 INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
778 INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
779
780 mutex_init(&ddev->poll_lock);
781 INIT_DELAYED_WORK(&ddev->poll_work, digital_wq_poll);
782
783 if (supported_protocols & NFC_PROTO_JEWEL_MASK)
784 ddev->protocols |= NFC_PROTO_JEWEL_MASK;
785 if (supported_protocols & NFC_PROTO_MIFARE_MASK)
786 ddev->protocols |= NFC_PROTO_MIFARE_MASK;
787 if (supported_protocols & NFC_PROTO_FELICA_MASK)
788 ddev->protocols |= NFC_PROTO_FELICA_MASK;
789 if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
790 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
791 if (supported_protocols & NFC_PROTO_ISO15693_MASK)
792 ddev->protocols |= NFC_PROTO_ISO15693_MASK;
793 if (supported_protocols & NFC_PROTO_ISO14443_MASK)
794 ddev->protocols |= NFC_PROTO_ISO14443_MASK;
795 if (supported_protocols & NFC_PROTO_ISO14443_B_MASK)
796 ddev->protocols |= NFC_PROTO_ISO14443_B_MASK;
797
798 ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
799 ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
800
801 ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
802 ddev->tx_headroom,
803 ddev->tx_tailroom);
804 if (!ddev->nfc_dev) {
805 pr_err("nfc_allocate_device failed\n");
806 goto free_dev;
807 }
808
809 nfc_set_drvdata(ddev->nfc_dev, ddev);
810
811 return ddev;
812
813free_dev:
814 kfree(ddev);
815
816 return NULL;
817}
818EXPORT_SYMBOL(nfc_digital_allocate_device);
819
820void nfc_digital_free_device(struct nfc_digital_dev *ddev)
821{
822 nfc_free_device(ddev->nfc_dev);
823 kfree(ddev);
824}
825EXPORT_SYMBOL(nfc_digital_free_device);
826
827int nfc_digital_register_device(struct nfc_digital_dev *ddev)
828{
829 return nfc_register_device(ddev->nfc_dev);
830}
831EXPORT_SYMBOL(nfc_digital_register_device);
832
833void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
834{
835 struct digital_cmd *cmd, *n;
836
837 nfc_unregister_device(ddev->nfc_dev);
838
839 mutex_lock(&ddev->poll_lock);
840 ddev->poll_tech_count = 0;
841 mutex_unlock(&ddev->poll_lock);
842
843 cancel_delayed_work_sync(&ddev->poll_work);
844 cancel_work_sync(&ddev->cmd_work);
845 cancel_work_sync(&ddev->cmd_complete_work);
846
847 list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
848 list_del(&cmd->queue);
849
850 /* Call the command callback if any and pass it a ENODEV error.
851 * This gives a chance to the command issuer to free any
852 * allocated buffer.
853 */
854 if (cmd->cmd_cb)
855 cmd->cmd_cb(ddev, cmd->cb_context, ERR_PTR(-ENODEV));
856
857 kfree(cmd->mdaa_params);
858 kfree(cmd);
859 }
860}
861EXPORT_SYMBOL(nfc_digital_unregister_device);
862
863MODULE_LICENSE("GPL");
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");