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Merge tag 'x86-fpu-2023-02-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
[linux-block.git] / net / nfc / digital_core.c
CommitLineData
2025cf9e 1// SPDX-License-Identifier: GPL-2.0-only
4b10884e
TE		 2/*
3 * NFC Digital Protocol stack
4 * Copyright (c) 2013, Intel Corporation.
4b10884e
TE		 5 */
6
c5da0e4a
SO		 7#define pr_fmt(fmt) "digital: %s: " fmt, __func__
8
4b10884e
TE		 9#include <linux/module.h>
10
11#include "digital.h"
12
59ee2361 13#define DIGITAL_PROTO_NFCA_RF_TECH \
ce2e56cd
SS		 14 (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | \
15 NFC_PROTO_NFC_DEP_MASK | NFC_PROTO_ISO14443_MASK)
59ee2361 16
24734607
MG		 17#define DIGITAL_PROTO_NFCB_RF_TECH NFC_PROTO_ISO14443_B_MASK
18
7d0911c0
TE		 19#define DIGITAL_PROTO_NFCF_RF_TECH \
20 (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)
8c0695e4 21
a381d482
MG		 22#define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK
23
7854a445
TE		 24/* Delay between each poll frame (ms) */
25#define DIGITAL_POLL_INTERVAL 10
26
59ee2361
TE		 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;
1c7a4c24 36 struct digital_tg_mdaa_params *mdaa_params;
59ee2361
TE		 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
2c66daec
TE		 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
634fef61
JB		 68 skb_put_u8(skb, crc & 0xFF);
69 skb_put_u8(skb, (crc >> 8) & 0xFF);
2c66daec
TE		 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
59ee2361
TE		 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
1c7a4c24 136 kfree(cmd->mdaa_params);
59ee2361
TE		 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;
1c7a4c24 156 struct digital_tg_mdaa_params *params;
59ee2361
TE		 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
af66df0f
TE		 170 cmd->pending = 1;
171
59ee2361
TE		 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;
1c7a4c24
TE		 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
bf30a67c
MG		 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
59ee2361 206 default:
26042530 207 pr_err("Unknown cmd type %d\n", cmd->type);
59ee2361
TE		 208 return;
209 }
210
211 if (!rc)
212 return;
213
26042530 214 pr_err("in_send_command returned err %d\n", rc);
59ee2361
TE		 215
216 mutex_lock(&ddev->cmd_lock);
217 list_del(&cmd->queue);
218 mutex_unlock(&ddev->cmd_lock);
219
220 kfree_skb(cmd->req);
1c7a4c24 221 kfree(cmd->mdaa_params);
59ee2361
TE		 222 kfree(cmd);
223
224 schedule_work(&ddev->cmd_work);
225}
226
227int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
1c7a4c24
TE		 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)
59ee2361
TE		 231{
232 struct digital_cmd *cmd;
233
ae72c991 234 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
59ee2361
TE		 235 if (!cmd)
236 return -ENOMEM;
237
238 cmd->type = cmd_type;
239 cmd->timeout = timeout;
240 cmd->req = skb;
1c7a4c24 241 cmd->mdaa_params = params;
59ee2361
TE		 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)
26042530 261 pr_err("in_configure_hw failed: %d\n", rc);
59ee2361
TE		 262
263 return rc;
264}
265
1c7a4c24
TE		 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)
26042530 272 pr_err("tg_configure_hw failed: %d\n", rc);
1c7a4c24
TE		 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;
58e7dcc9 280 int rc;
1c7a4c24 281
ae72c991 282 params = kzalloc(sizeof(*params), GFP_KERNEL);
1c7a4c24
TE		 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
58e7dcc9
ZX		 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;
1c7a4c24
TE		 301}
302
bf30a67c
MG		 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
2c66daec
TE		 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;
0529a7ad 315 u8 poll_tech_count;
2c66daec
TE		 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
8c0695e4
TE		 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
7d0911c0
TE		 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
a381d482 352 case NFC_PROTO_ISO15693:
ceeee42d 353 framing = NFC_DIGITAL_FRAMING_ISO15693_T5T;
a381d482
MG		 354 check_crc = digital_skb_check_crc_b;
355 add_crc = digital_skb_add_crc_b;
564af14e 356 break;
12e3d241
TE		 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;
a381d482
MG		 362 break;
363
24734607
MG		 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
2c66daec 370 default:
26042530 371 pr_err("Invalid protocol %d\n", protocol);
2c66daec
TE		 372 return -EINVAL;
373 }
374
26042530 375 pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);
2c66daec
TE		 376
377 ddev->curr_rf_tech = rf_tech;
2c66daec
TE		 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);
2c66daec 392
0529a7ad 393 poll_tech_count = ddev->poll_tech_count;
2c66daec
TE		 394 ddev->poll_tech_count = 0;
395
0529a7ad
MG		 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
2c66daec
TE		 402 return 0;
403}
404
59ee2361
TE		 405void digital_poll_next_tech(struct nfc_digital_dev *ddev)
406{
9dc33705
TE		 407 u8 rand_mod;
408
59ee2361
TE		 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
9dc33705
TE		 418 get_random_bytes(&rand_mod, sizeof(rand_mod));
419 ddev->poll_tech_index = rand_mod % ddev->poll_tech_count;
59ee2361
TE		 420
421 mutex_unlock(&ddev->poll_lock);
422
7854a445
TE		 423 schedule_delayed_work(&ddev->poll_work,
424 msecs_to_jiffies(DIGITAL_POLL_INTERVAL));
59ee2361
TE		 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,
7854a445 433 poll_work.work);
59ee2361
TE		 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/**
b6908cf7 465 * digital_start_poll - start_poll operation
7cdda1c1
AL		 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
59ee2361
TE		 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 */
4b10884e
TE		 476static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
477 __u32 tm_protocols)
478{
59ee2361
TE		 479 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
480 u32 matching_im_protocols, matching_tm_protocols;
481
26042530 482 pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols,
c5da0e4a 483 tm_protocols, ddev->protocols);
59ee2361
TE		 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) {
26042530 489 pr_err("Unknown protocol\n");
59ee2361
TE		 490 return -EINVAL;
491 }
492
493 if (ddev->poll_tech_count) {
26042530 494 pr_err("Already polling\n");
59ee2361
TE		 495 return -EBUSY;
496 }
497
498 if (ddev->curr_protocol) {
26042530 499 pr_err("A target is already active\n");
59ee2361
TE		 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
24734607
MG		 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
4f913d46 514 if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
8c0695e4
TE		 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
a381d482
MG		 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
4f913d46 526 if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
1c7a4c24
TE		 527 if (ddev->ops->tg_listen_mdaa) {
528 digital_add_poll_tech(ddev, 0,
529 digital_tg_listen_mdaa);
bf30a67c
MG		 530 } else if (ddev->ops->tg_listen_md) {
531 digital_add_poll_tech(ddev, 0,
532 digital_tg_listen_md);
1c7a4c24
TE		 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
59ee2361 545 if (!ddev->poll_tech_count) {
26042530 546 pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n",
59ee2361
TE		 547 matching_im_protocols, matching_tm_protocols);
548 return -EINVAL;
549 }
550
7854a445 551 schedule_delayed_work(&ddev->poll_work, 0);
59ee2361
TE		 552
553 return 0;
4b10884e
TE		 554}
555
556static void digital_stop_poll(struct nfc_dev *nfc_dev)
557{
59ee2361
TE		 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) {
26042530 563 pr_err("Polling operation was not running\n");
59ee2361
TE		 564 mutex_unlock(&ddev->poll_lock);
565 return;
566 }
567
568 ddev->poll_tech_count = 0;
569
570 mutex_unlock(&ddev->poll_lock);
571
7854a445 572 cancel_delayed_work_sync(&ddev->poll_work);
59ee2361
TE		 573
574 digital_abort_cmd(ddev);
4b10884e
TE		 575}
576
577static int digital_dev_up(struct nfc_dev *nfc_dev)
578{
59ee2361
TE		 579 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
580
581 digital_switch_rf(ddev, 1);
582
583 return 0;
4b10884e
TE		 584}
585
586static int digital_dev_down(struct nfc_dev *nfc_dev)
587{
59ee2361
TE		 588 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
589
590 digital_switch_rf(ddev, 0);
591
592 return 0;
4b10884e
TE		 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{
7d0911c0 599 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
48e10445
TE		 600 int rc;
601
602 rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
7d0911c0 603
48e10445
TE		 604 if (!rc)
605 ddev->curr_protocol = NFC_PROTO_NFC_DEP;
606
607 return rc;
4b10884e
TE		 608}
609
610static int digital_dep_link_down(struct nfc_dev *nfc_dev)
611{
7d0911c0
TE		 612 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
613
3cc952db
TE		 614 digital_abort_cmd(ddev);
615
7d0911c0
TE		 616 ddev->curr_protocol = 0;
617
618 return 0;
4b10884e
TE		 619}
620
621static int digital_activate_target(struct nfc_dev *nfc_dev,
622 struct nfc_target *target, __u32 protocol)
623{
48e10445
TE		 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
59ee2361 638 return 0;
4b10884e
TE		 639}
640
641static void digital_deactivate_target(struct nfc_dev *nfc_dev,
96d4581f
CR		 642 struct nfc_target *target,
643 u8 mode)
4b10884e 644{
59ee2361
TE		 645 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
646
48e10445
TE		 647 if (!ddev->curr_protocol) {
648 pr_err("No active target\n");
649 return;
650 }
651
72ad533a 652 digital_abort_cmd(ddev);
59ee2361 653 ddev->curr_protocol = 0;
4b10884e
TE		 654}
655
656static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb)
657{
1c7a4c24
TE		 658 struct nfc_digital_dev *ddev = nfc_get_drvdata(dev);
659
660 return digital_tg_send_dep_res(ddev, skb);
4b10884e
TE		 661}
662
2c66daec
TE		 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);
c813007f 671 resp = NULL;
2c66daec
TE		 672 goto done;
673 }
674
c813007f 675 if (ddev->curr_protocol == NFC_PROTO_MIFARE) {
2c66daec 676 rc = digital_in_recv_mifare_res(resp);
c813007f
TE		 677 /* crc check is done in digital_in_recv_mifare_res() */
678 goto done;
679 }
680
24734607
MG		 681 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
682 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
c813007f
TE		 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);
2c66daec 689
c813007f 690done:
2c66daec
TE		 691 if (rc) {
692 kfree_skb(resp);
693 resp = NULL;
694 }
695
2c66daec
TE		 696 data_exch->cb(data_exch->cb_context, resp, rc);
697
698 kfree(data_exch);
699}
700
4b10884e
TE		 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{
2c66daec
TE		 705 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
706 struct digital_data_exch *data_exch;
c813007f 707 int rc;
2c66daec 708
ae72c991 709 data_exch = kzalloc(sizeof(*data_exch), GFP_KERNEL);
dcfca27f 710 if (!data_exch)
2c66daec 711 return -ENOMEM;
2c66daec
TE		 712
713 data_exch->cb = cb;
714 data_exch->cb_context = cb_context;
715
6ea7398d
TE		 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 }
7d0911c0 720
24734607
MG		 721 if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
722 (ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
c813007f
TE		 723 rc = digital_in_iso_dep_push_sod(ddev, skb);
724 if (rc)
6ea7398d 725 goto exit;
c813007f
TE		 726 }
727
2c66daec
TE		 728 ddev->skb_add_crc(skb);
729
6ea7398d
TE		 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;
4b10884e
TE		 738}
739
f6c802a7 740static const struct nfc_ops digital_nfc_ops = {
4b10884e
TE		 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
7186aac9 753struct nfc_digital_dev *nfc_digital_allocate_device(const struct nfc_digital_ops *ops,
4b10884e
TE		 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 ||
bf30a67c 762 !ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech))
4b10884e
TE		 763 return NULL;
764
ae72c991 765 ddev = kzalloc(sizeof(*ddev), GFP_KERNEL);
26042530 766 if (!ddev)
4b10884e 767 return NULL;
4b10884e
TE		 768
769 ddev->driver_capabilities = driver_capabilities;
770 ddev->ops = ops;
771
59ee2361
TE		 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);
7854a445 779 INIT_DELAYED_WORK(&ddev->poll_work, digital_wq_poll);
59ee2361
TE		 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;
8c0695e4
TE		 785 if (supported_protocols & NFC_PROTO_FELICA_MASK)
786 ddev->protocols |= NFC_PROTO_FELICA_MASK;
7d0911c0
TE		 787 if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
788 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
a381d482
MG		 789 if (supported_protocols & NFC_PROTO_ISO15693_MASK)
790 ddev->protocols |= NFC_PROTO_ISO15693_MASK;
12e3d241
TE		 791 if (supported_protocols & NFC_PROTO_ISO14443_MASK)
792 ddev->protocols |= NFC_PROTO_ISO14443_MASK;
24734607
MG		 793 if (supported_protocols & NFC_PROTO_ISO14443_B_MASK)
794 ddev->protocols |= NFC_PROTO_ISO14443_B_MASK;
59ee2361
TE		 795
796 ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
797 ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
4b10884e
TE		 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) {
26042530 803 pr_err("nfc_allocate_device failed\n");
4b10884e
TE		 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);
4b10884e
TE		 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{
59ee2361
TE		 833 struct digital_cmd *cmd, *n;
834
4b10884e 835 nfc_unregister_device(ddev->nfc_dev);
59ee2361
TE		 836
837 mutex_lock(&ddev->poll_lock);
838 ddev->poll_tech_count = 0;
839 mutex_unlock(&ddev->poll_lock);
840
7854a445 841 cancel_delayed_work_sync(&ddev->poll_work);
59ee2361
TE		 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);
82e57952
TE		 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
1c7a4c24 855 kfree(cmd->mdaa_params);
59ee2361
TE		 856 kfree(cmd);
857 }
4b10884e
TE		 858}
859EXPORT_SYMBOL(nfc_digital_unregister_device);
860
861MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)