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Merge tag 'firewire-update2' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee139...
[deliverable/linux.git] / net / nfc / digital_core.c
CommitLineData
4b10884e
TE		 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
c5da0e4a
SO		 16#define pr_fmt(fmt) "digital: %s: " fmt, __func__
17
4b10884e
TE		 18#include <linux/module.h>
19
20#include "digital.h"
21
59ee2361 22#define DIGITAL_PROTO_NFCA_RF_TECH \
ce2e56cd
SS		 23 (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | \
24 NFC_PROTO_NFC_DEP_MASK | NFC_PROTO_ISO14443_MASK)
59ee2361 25
24734607
MG		 26#define DIGITAL_PROTO_NFCB_RF_TECH NFC_PROTO_ISO14443_B_MASK
27
7d0911c0
TE		 28#define DIGITAL_PROTO_NFCF_RF_TECH \
29 (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)
8c0695e4 30
a381d482
MG		 31#define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK
32
59ee2361
TE		 33struct digital_cmd {
34 struct list_head queue;
35
36 u8 type;
37 u8 pending;
38
39 u16 timeout;
40 struct sk_buff *req;
41 struct sk_buff *resp;
1c7a4c24 42 struct digital_tg_mdaa_params *mdaa_params;
59ee2361
TE		 43
44 nfc_digital_cmd_complete_t cmd_cb;
45 void *cb_context;
46};
47
48struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
49 unsigned int len)
50{
51 struct sk_buff *skb;
52
53 skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom,
54 GFP_KERNEL);
55 if (skb)
56 skb_reserve(skb, ddev->tx_headroom);
57
58 return skb;
59}
60
2c66daec
TE		 61void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
62 u8 bitwise_inv, u8 msb_first)
63{
64 u16 crc;
65
66 crc = crc_func(init, skb->data, skb->len);
67
68 if (bitwise_inv)
69 crc = ~crc;
70
71 if (msb_first)
72 crc = __fswab16(crc);
73
74 *skb_put(skb, 1) = crc & 0xFF;
75 *skb_put(skb, 1) = (crc >> 8) & 0xFF;
76}
77
78int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
79 u16 crc_init, u8 bitwise_inv, u8 msb_first)
80{
81 int rc;
82 u16 crc;
83
84 if (skb->len <= 2)
85 return -EIO;
86
87 crc = crc_func(crc_init, skb->data, skb->len - 2);
88
89 if (bitwise_inv)
90 crc = ~crc;
91
92 if (msb_first)
93 crc = __swab16(crc);
94
95 rc = (skb->data[skb->len - 2] - (crc & 0xFF)) +
96 (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF));
97
98 if (rc)
99 return -EIO;
100
101 skb_trim(skb, skb->len - 2);
102
103 return 0;
104}
105
59ee2361
TE		 106static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
107{
108 ddev->ops->switch_rf(ddev, on);
109}
110
111static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
112{
113 ddev->ops->abort_cmd(ddev);
114}
115
116static void digital_wq_cmd_complete(struct work_struct *work)
117{
118 struct digital_cmd *cmd;
119 struct nfc_digital_dev *ddev = container_of(work,
120 struct nfc_digital_dev,
121 cmd_complete_work);
122
123 mutex_lock(&ddev->cmd_lock);
124
125 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
126 queue);
127 if (!cmd) {
128 mutex_unlock(&ddev->cmd_lock);
129 return;
130 }
131
132 list_del(&cmd->queue);
133
134 mutex_unlock(&ddev->cmd_lock);
135
136 if (!IS_ERR(cmd->resp))
137 print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1,
138 cmd->resp->data, cmd->resp->len, false);
139
140 cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp);
141
1c7a4c24 142 kfree(cmd->mdaa_params);
59ee2361
TE		 143 kfree(cmd);
144
145 schedule_work(&ddev->cmd_work);
146}
147
148static void digital_send_cmd_complete(struct nfc_digital_dev *ddev,
149 void *arg, struct sk_buff *resp)
150{
151 struct digital_cmd *cmd = arg;
152
153 cmd->resp = resp;
154
155 schedule_work(&ddev->cmd_complete_work);
156}
157
158static void digital_wq_cmd(struct work_struct *work)
159{
160 int rc;
161 struct digital_cmd *cmd;
1c7a4c24 162 struct digital_tg_mdaa_params *params;
59ee2361
TE		 163 struct nfc_digital_dev *ddev = container_of(work,
164 struct nfc_digital_dev,
165 cmd_work);
166
167 mutex_lock(&ddev->cmd_lock);
168
169 cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
170 queue);
171 if (!cmd || cmd->pending) {
172 mutex_unlock(&ddev->cmd_lock);
173 return;
174 }
175
176 mutex_unlock(&ddev->cmd_lock);
177
178 if (cmd->req)
179 print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1,
180 cmd->req->data, cmd->req->len, false);
181
182 switch (cmd->type) {
183 case DIGITAL_CMD_IN_SEND:
184 rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout,
185 digital_send_cmd_complete, cmd);
186 break;
1c7a4c24
TE		 187
188 case DIGITAL_CMD_TG_SEND:
189 rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout,
190 digital_send_cmd_complete, cmd);
191 break;
192
193 case DIGITAL_CMD_TG_LISTEN:
194 rc = ddev->ops->tg_listen(ddev, cmd->timeout,
195 digital_send_cmd_complete, cmd);
196 break;
197
198 case DIGITAL_CMD_TG_LISTEN_MDAA:
199 params = cmd->mdaa_params;
200
201 rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout,
202 digital_send_cmd_complete, cmd);
203 break;
204
bf30a67c
MG		 205 case DIGITAL_CMD_TG_LISTEN_MD:
206 rc = ddev->ops->tg_listen_md(ddev, cmd->timeout,
207 digital_send_cmd_complete, cmd);
208 break;
209
59ee2361 210 default:
26042530 211 pr_err("Unknown cmd type %d\n", cmd->type);
59ee2361
TE		 212 return;
213 }
214
215 if (!rc)
216 return;
217
26042530 218 pr_err("in_send_command returned err %d\n", rc);
59ee2361
TE		 219
220 mutex_lock(&ddev->cmd_lock);
221 list_del(&cmd->queue);
222 mutex_unlock(&ddev->cmd_lock);
223
224 kfree_skb(cmd->req);
1c7a4c24 225 kfree(cmd->mdaa_params);
59ee2361
TE		 226 kfree(cmd);
227
228 schedule_work(&ddev->cmd_work);
229}
230
231int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
1c7a4c24
TE		 232 struct sk_buff *skb, struct digital_tg_mdaa_params *params,
233 u16 timeout, nfc_digital_cmd_complete_t cmd_cb,
234 void *cb_context)
59ee2361
TE		 235{
236 struct digital_cmd *cmd;
237
238 cmd = kzalloc(sizeof(struct digital_cmd), GFP_KERNEL);
239 if (!cmd)
240 return -ENOMEM;
241
242 cmd->type = cmd_type;
243 cmd->timeout = timeout;
244 cmd->req = skb;
1c7a4c24 245 cmd->mdaa_params = params;
59ee2361
TE		 246 cmd->cmd_cb = cmd_cb;
247 cmd->cb_context = cb_context;
248 INIT_LIST_HEAD(&cmd->queue);
249
250 mutex_lock(&ddev->cmd_lock);
251 list_add_tail(&cmd->queue, &ddev->cmd_queue);
252 mutex_unlock(&ddev->cmd_lock);
253
254 schedule_work(&ddev->cmd_work);
255
256 return 0;
257}
258
259int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
260{
261 int rc;
262
263 rc = ddev->ops->in_configure_hw(ddev, type, param);
264 if (rc)
26042530 265 pr_err("in_configure_hw failed: %d\n", rc);
59ee2361
TE		 266
267 return rc;
268}
269
1c7a4c24
TE		 270int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
271{
272 int rc;
273
274 rc = ddev->ops->tg_configure_hw(ddev, type, param);
275 if (rc)
26042530 276 pr_err("tg_configure_hw failed: %d\n", rc);
1c7a4c24
TE		 277
278 return rc;
279}
280
281static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
282{
283 struct digital_tg_mdaa_params *params;
284
285 params = kzalloc(sizeof(struct digital_tg_mdaa_params), GFP_KERNEL);
286 if (!params)
287 return -ENOMEM;
288
289 params->sens_res = DIGITAL_SENS_RES_NFC_DEP;
290 get_random_bytes(params->nfcid1, sizeof(params->nfcid1));
291 params->sel_res = DIGITAL_SEL_RES_NFC_DEP;
292
293 params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
294 params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
295 get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
296 params->sc = DIGITAL_SENSF_FELICA_SC;
297
298 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
299 500, digital_tg_recv_atr_req, NULL);
300}
301
bf30a67c
MG		 302static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech)
303{
304 return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, 500,
305 digital_tg_recv_md_req, NULL);
306}
307
2c66daec
TE		 308int digital_target_found(struct nfc_digital_dev *ddev,
309 struct nfc_target *target, u8 protocol)
310{
311 int rc;
312 u8 framing;
313 u8 rf_tech;
0529a7ad 314 u8 poll_tech_count;
2c66daec
TE		 315 int (*check_crc)(struct sk_buff *skb);
316 void (*add_crc)(struct sk_buff *skb);
317
318 rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech;
319
320 switch (protocol) {
321 case NFC_PROTO_JEWEL:
322 framing = NFC_DIGITAL_FRAMING_NFCA_T1T;
323 check_crc = digital_skb_check_crc_b;
324 add_crc = digital_skb_add_crc_b;
325 break;
326
327 case NFC_PROTO_MIFARE:
328 framing = NFC_DIGITAL_FRAMING_NFCA_T2T;
329 check_crc = digital_skb_check_crc_a;
330 add_crc = digital_skb_add_crc_a;
331 break;
332
8c0695e4
TE		 333 case NFC_PROTO_FELICA:
334 framing = NFC_DIGITAL_FRAMING_NFCF_T3T;
335 check_crc = digital_skb_check_crc_f;
336 add_crc = digital_skb_add_crc_f;
337 break;
338
7d0911c0
TE		 339 case NFC_PROTO_NFC_DEP:
340 if (rf_tech == NFC_DIGITAL_RF_TECH_106A) {
341 framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP;
342 check_crc = digital_skb_check_crc_a;
343 add_crc = digital_skb_add_crc_a;
344 } else {
345 framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP;
346 check_crc = digital_skb_check_crc_f;
347 add_crc = digital_skb_add_crc_f;
348 }
349 break;
350
a381d482 351 case NFC_PROTO_ISO15693:
ceeee42d 352 framing = NFC_DIGITAL_FRAMING_ISO15693_T5T;
a381d482
MG		 353 check_crc = digital_skb_check_crc_b;
354 add_crc = digital_skb_add_crc_b;
564af14e 355 break;
12e3d241
TE		 356
357 case NFC_PROTO_ISO14443:
358 framing = NFC_DIGITAL_FRAMING_NFCA_T4T;
359 check_crc = digital_skb_check_crc_a;
360 add_crc = digital_skb_add_crc_a;
a381d482
MG		 361 break;
362
24734607
MG		 363 case NFC_PROTO_ISO14443_B:
364 framing = NFC_DIGITAL_FRAMING_NFCB_T4T;
365 check_crc = digital_skb_check_crc_b;
366 add_crc = digital_skb_add_crc_b;
367 break;
368
2c66daec 369 default:
26042530 370 pr_err("Invalid protocol %d\n", protocol);
2c66daec
TE		 371 return -EINVAL;
372 }
373
26042530 374 pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);
2c66daec
TE		 375
376 ddev->curr_rf_tech = rf_tech;
2c66daec
TE		 377
378 if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
379 ddev->skb_add_crc = digital_skb_add_crc_none;
380 ddev->skb_check_crc = digital_skb_check_crc_none;
381 } else {
382 ddev->skb_add_crc = add_crc;
383 ddev->skb_check_crc = check_crc;
384 }
385
386 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing);
387 if (rc)
388 return rc;
389
390 target->supported_protocols = (1 << protocol);
2c66daec 391
0529a7ad 392 poll_tech_count = ddev->poll_tech_count;
2c66daec
TE		 393 ddev->poll_tech_count = 0;
394
0529a7ad
MG		 395 rc = nfc_targets_found(ddev->nfc_dev, target, 1);
396 if (rc) {
397 ddev->poll_tech_count = poll_tech_count;
398 return rc;
399 }
400
2c66daec
TE		 401 return 0;
402}
403
59ee2361
TE		 404void digital_poll_next_tech(struct nfc_digital_dev *ddev)
405{
9dc33705
TE		 406 u8 rand_mod;
407
59ee2361
TE		 408 digital_switch_rf(ddev, 0);
409
410 mutex_lock(&ddev->poll_lock);
411
412 if (!ddev->poll_tech_count) {
413 mutex_unlock(&ddev->poll_lock);
414 return;
415 }
416
9dc33705
TE		 417 get_random_bytes(&rand_mod, sizeof(rand_mod));
418 ddev->poll_tech_index = rand_mod % ddev->poll_tech_count;
59ee2361
TE		 419
420 mutex_unlock(&ddev->poll_lock);
421
422 schedule_work(&ddev->poll_work);
423}
424
425static void digital_wq_poll(struct work_struct *work)
426{
427 int rc;
428 struct digital_poll_tech *poll_tech;
429 struct nfc_digital_dev *ddev = container_of(work,
430 struct nfc_digital_dev,
431 poll_work);
432 mutex_lock(&ddev->poll_lock);
433
434 if (!ddev->poll_tech_count) {
435 mutex_unlock(&ddev->poll_lock);
436 return;
437 }
438
439 poll_tech = &ddev->poll_techs[ddev->poll_tech_index];
440
441 mutex_unlock(&ddev->poll_lock);
442
443 rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
444 if (rc)
445 digital_poll_next_tech(ddev);
446}
447
448static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
449 digital_poll_t poll_func)
450{
451 struct digital_poll_tech *poll_tech;
452
453 if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
454 return;
455
456 poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];
457
458 poll_tech->rf_tech = rf_tech;
459 poll_tech->poll_func = poll_func;
460}
461
462/**
463 * start_poll operation
464 *
465 * For every supported protocol, the corresponding polling function is added
466 * to the table of polling technologies (ddev->poll_techs[]) using
467 * digital_add_poll_tech().
468 * When a polling function fails (by timeout or protocol error) the next one is
469 * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
470 */
4b10884e
TE		 471static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
472 __u32 tm_protocols)
473{
59ee2361
TE		 474 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
475 u32 matching_im_protocols, matching_tm_protocols;
476
26042530 477 pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols,
c5da0e4a 478 tm_protocols, ddev->protocols);
59ee2361
TE		 479
480 matching_im_protocols = ddev->protocols & im_protocols;
481 matching_tm_protocols = ddev->protocols & tm_protocols;
482
483 if (!matching_im_protocols && !matching_tm_protocols) {
26042530 484 pr_err("Unknown protocol\n");
59ee2361
TE		 485 return -EINVAL;
486 }
487
488 if (ddev->poll_tech_count) {
26042530 489 pr_err("Already polling\n");
59ee2361
TE		 490 return -EBUSY;
491 }
492
493 if (ddev->curr_protocol) {
26042530 494 pr_err("A target is already active\n");
59ee2361
TE		 495 return -EBUSY;
496 }
497
498 ddev->poll_tech_count = 0;
499 ddev->poll_tech_index = 0;
500
501 if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
502 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
503 digital_in_send_sens_req);
504
24734607
MG		 505 if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH)
506 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B,
507 digital_in_send_sensb_req);
508
4f913d46 509 if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
8c0695e4
TE		 510 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
511 digital_in_send_sensf_req);
512
513 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
514 digital_in_send_sensf_req);
515 }
516
a381d482
MG		 517 if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH)
518 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693,
519 digital_in_send_iso15693_inv_req);
520
4f913d46 521 if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
1c7a4c24
TE		 522 if (ddev->ops->tg_listen_mdaa) {
523 digital_add_poll_tech(ddev, 0,
524 digital_tg_listen_mdaa);
bf30a67c
MG		 525 } else if (ddev->ops->tg_listen_md) {
526 digital_add_poll_tech(ddev, 0,
527 digital_tg_listen_md);
1c7a4c24
TE		 528 } else {
529 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
530 digital_tg_listen_nfca);
531
532 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
533 digital_tg_listen_nfcf);
534
535 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
536 digital_tg_listen_nfcf);
537 }
538 }
539
59ee2361 540 if (!ddev->poll_tech_count) {
26042530 541 pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n",
59ee2361
TE		 542 matching_im_protocols, matching_tm_protocols);
543 return -EINVAL;
544 }
545
546 schedule_work(&ddev->poll_work);
547
548 return 0;
4b10884e
TE		 549}
550
551static void digital_stop_poll(struct nfc_dev *nfc_dev)
552{
59ee2361
TE		 553 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
554
555 mutex_lock(&ddev->poll_lock);
556
557 if (!ddev->poll_tech_count) {
26042530 558 pr_err("Polling operation was not running\n");
59ee2361
TE		 559 mutex_unlock(&ddev->poll_lock);
560 return;
561 }
562
563 ddev->poll_tech_count = 0;
564
565 mutex_unlock(&ddev->poll_lock);
566
567 cancel_work_sync(&ddev->poll_work);
568
569 digital_abort_cmd(ddev);
4b10884e
TE		 570}
571
572static int digital_dev_up(struct nfc_dev *nfc_dev)
573{
59ee2361
TE		 574 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
575
576 digital_switch_rf(ddev, 1);
577
578 return 0;
4b10884e
TE		 579}
580
581static int digital_dev_down(struct nfc_dev *nfc_dev)
582{
59ee2361
TE		 583 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
584
585 digital_switch_rf(ddev, 0);
586
587 return 0;
4b10884e
TE		 588}
589
590static int digital_dep_link_up(struct nfc_dev *nfc_dev,
591 struct nfc_target *target,
592 __u8 comm_mode, __u8 *gb, size_t gb_len)
593{
7d0911c0 594 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
48e10445
TE		 595 int rc;
596
597 rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
7d0911c0 598
48e10445
TE		 599 if (!rc)
600 ddev->curr_protocol = NFC_PROTO_NFC_DEP;
601
602 return rc;
4b10884e
TE		 603}
604
605static int digital_dep_link_down(struct nfc_dev *nfc_dev)
606{
7d0911c0
TE		 607 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
608
609 ddev->curr_protocol = 0;
610
611 return 0;
4b10884e
TE		 612}
613
614static int digital_activate_target(struct nfc_dev *nfc_dev,
615 struct nfc_target *target, __u32 protocol)
616{
48e10445
TE		 617 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
618
619 if (ddev->poll_tech_count) {
620 pr_err("Can't activate a target while polling\n");
621 return -EBUSY;
622 }
623
624 if (ddev->curr_protocol) {
625 pr_err("A target is already active\n");
626 return -EBUSY;
627 }
628
629 ddev->curr_protocol = protocol;
630
59ee2361 631 return 0;
4b10884e
TE		 632}
633
634static void digital_deactivate_target(struct nfc_dev *nfc_dev,
96d4581f
CR		 635 struct nfc_target *target,
636 u8 mode)
4b10884e 637{
59ee2361
TE		 638 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
639
48e10445
TE		 640 if (!ddev->curr_protocol) {
641 pr_err("No active target\n");
642 return;
643 }
644
59ee2361 645 ddev->curr_protocol = 0;
4b10884e
TE		 646}
647
648static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb)
649{
1c7a4c24
TE		 650 struct nfc_digital_dev *ddev = nfc_get_drvdata(dev);
651
652 return digital_tg_send_dep_res(ddev, skb);
4b10884e
TE		 653}
654
2c66daec
TE		 655static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg,
656 struct sk_buff *resp)
657{
658 struct digital_data_exch *data_exch = arg;
659 int rc;
660
661 if (IS_ERR(resp)) {
662 rc = PTR_ERR(resp);
c813007f 663 resp = NULL;
2c66daec
TE		 664 goto done;
665 }
666
c813007f 667 if (ddev->curr_protocol == NFC_PROTO_MIFARE) {
2c66daec 668 rc = digital_in_recv_mifare_res(resp);
c813007f
TE		 669 /* crc check is done in digital_in_recv_mifare_res() */
670 goto done;
671 }
672
24734607
MG		 673 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
674 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
c813007f
TE		 675 rc = digital_in_iso_dep_pull_sod(ddev, resp);
676 if (rc)
677 goto done;
678 }
679
680 rc = ddev->skb_check_crc(resp);
2c66daec 681
c813007f 682done:
2c66daec
TE		 683 if (rc) {
684 kfree_skb(resp);
685 resp = NULL;
686 }
687
2c66daec
TE		 688 data_exch->cb(data_exch->cb_context, resp, rc);
689
690 kfree(data_exch);
691}
692
4b10884e
TE		 693static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target,
694 struct sk_buff *skb, data_exchange_cb_t cb,
695 void *cb_context)
696{
2c66daec
TE		 697 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
698 struct digital_data_exch *data_exch;
c813007f 699 int rc;
2c66daec
TE		 700
701 data_exch = kzalloc(sizeof(struct digital_data_exch), GFP_KERNEL);
702 if (!data_exch) {
26042530 703 pr_err("Failed to allocate data_exch struct\n");
2c66daec
TE		 704 return -ENOMEM;
705 }
706
707 data_exch->cb = cb;
708 data_exch->cb_context = cb_context;
709
6ea7398d
TE		 710 if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) {
711 rc = digital_in_send_dep_req(ddev, target, skb, data_exch);
712 goto exit;
713 }
7d0911c0 714
24734607
MG		 715 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
716 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
c813007f
TE		 717 rc = digital_in_iso_dep_push_sod(ddev, skb);
718 if (rc)
6ea7398d 719 goto exit;
c813007f
TE		 720 }
721
2c66daec
TE		 722 ddev->skb_add_crc(skb);
723
6ea7398d
TE		 724 rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
725 data_exch);
726
727exit:
728 if (rc)
729 kfree(data_exch);
730
731 return rc;
4b10884e
TE		 732}
733
734static struct nfc_ops digital_nfc_ops = {
735 .dev_up = digital_dev_up,
736 .dev_down = digital_dev_down,
737 .start_poll = digital_start_poll,
738 .stop_poll = digital_stop_poll,
739 .dep_link_up = digital_dep_link_up,
740 .dep_link_down = digital_dep_link_down,
741 .activate_target = digital_activate_target,
742 .deactivate_target = digital_deactivate_target,
743 .tm_send = digital_tg_send,
744 .im_transceive = digital_in_send,
745};
746
747struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
748 __u32 supported_protocols,
749 __u32 driver_capabilities,
750 int tx_headroom, int tx_tailroom)
751{
752 struct nfc_digital_dev *ddev;
753
754 if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen ||
755 !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd ||
bf30a67c 756 !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech))
4b10884e
TE		 757 return NULL;
758
759 ddev = kzalloc(sizeof(struct nfc_digital_dev), GFP_KERNEL);
26042530 760 if (!ddev)
4b10884e 761 return NULL;
4b10884e
TE		 762
763 ddev->driver_capabilities = driver_capabilities;
764 ddev->ops = ops;
765
59ee2361
TE		 766 mutex_init(&ddev->cmd_lock);
767 INIT_LIST_HEAD(&ddev->cmd_queue);
768
769 INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
770 INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
771
772 mutex_init(&ddev->poll_lock);
773 INIT_WORK(&ddev->poll_work, digital_wq_poll);
774
775 if (supported_protocols & NFC_PROTO_JEWEL_MASK)
776 ddev->protocols |= NFC_PROTO_JEWEL_MASK;
777 if (supported_protocols & NFC_PROTO_MIFARE_MASK)
778 ddev->protocols |= NFC_PROTO_MIFARE_MASK;
8c0695e4
TE		 779 if (supported_protocols & NFC_PROTO_FELICA_MASK)
780 ddev->protocols |= NFC_PROTO_FELICA_MASK;
7d0911c0
TE		 781 if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
782 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
a381d482
MG		 783 if (supported_protocols & NFC_PROTO_ISO15693_MASK)
784 ddev->protocols |= NFC_PROTO_ISO15693_MASK;
12e3d241
TE		 785 if (supported_protocols & NFC_PROTO_ISO14443_MASK)
786 ddev->protocols |= NFC_PROTO_ISO14443_MASK;
24734607
MG		 787 if (supported_protocols & NFC_PROTO_ISO14443_B_MASK)
788 ddev->protocols |= NFC_PROTO_ISO14443_B_MASK;
59ee2361
TE		 789
790 ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
791 ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
4b10884e
TE		 792
793 ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
794 ddev->tx_headroom,
795 ddev->tx_tailroom);
796 if (!ddev->nfc_dev) {
26042530 797 pr_err("nfc_allocate_device failed\n");
4b10884e
TE		 798 goto free_dev;
799 }
800
801 nfc_set_drvdata(ddev->nfc_dev, ddev);
802
803 return ddev;
804
805free_dev:
806 kfree(ddev);
807
808 return NULL;
809}
810EXPORT_SYMBOL(nfc_digital_allocate_device);
811
812void nfc_digital_free_device(struct nfc_digital_dev *ddev)
813{
814 nfc_free_device(ddev->nfc_dev);
4b10884e
TE		 815 kfree(ddev);
816}
817EXPORT_SYMBOL(nfc_digital_free_device);
818
819int nfc_digital_register_device(struct nfc_digital_dev *ddev)
820{
821 return nfc_register_device(ddev->nfc_dev);
822}
823EXPORT_SYMBOL(nfc_digital_register_device);
824
825void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
826{
59ee2361
TE		 827 struct digital_cmd *cmd, *n;
828
4b10884e 829 nfc_unregister_device(ddev->nfc_dev);
59ee2361
TE		 830
831 mutex_lock(&ddev->poll_lock);
832 ddev->poll_tech_count = 0;
833 mutex_unlock(&ddev->poll_lock);
834
835 cancel_work_sync(&ddev->poll_work);
836 cancel_work_sync(&ddev->cmd_work);
837 cancel_work_sync(&ddev->cmd_complete_work);
838
839 list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
840 list_del(&cmd->queue);
1c7a4c24 841 kfree(cmd->mdaa_params);
59ee2361
TE		 842 kfree(cmd);
843 }
4b10884e
TE		 844}
845EXPORT_SYMBOL(nfc_digital_unregister_device);
846
847MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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