projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
NFC: port100: Fix possible buffer overflow
[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 \
7d0911c0 23 (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | NFC_PROTO_NFC_DEP_MASK)
59ee2361 24
7d0911c0
TE		 25#define DIGITAL_PROTO_NFCF_RF_TECH \
26 (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)
8c0695e4 27
a381d482
MG		 28#define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK
29
59ee2361
TE		 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;
1c7a4c24 39 struct digital_tg_mdaa_params *mdaa_params;
59ee2361
TE		 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
2c66daec
TE		 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
59ee2361
TE		 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
1c7a4c24 139 kfree(cmd->mdaa_params);
59ee2361
TE		 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;
1c7a4c24 159 struct digital_tg_mdaa_params *params;
59ee2361
TE		 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;
1c7a4c24
TE		 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
59ee2361 202 default:
26042530 203 pr_err("Unknown cmd type %d\n", cmd->type);
59ee2361
TE		 204 return;
205 }
206
207 if (!rc)
208 return;
209
26042530 210 pr_err("in_send_command returned err %d\n", rc);
59ee2361
TE		 211
212 mutex_lock(&ddev->cmd_lock);
213 list_del(&cmd->queue);
214 mutex_unlock(&ddev->cmd_lock);
215
216 kfree_skb(cmd->req);
1c7a4c24 217 kfree(cmd->mdaa_params);
59ee2361
TE		 218 kfree(cmd);
219
220 schedule_work(&ddev->cmd_work);
221}
222
223int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
1c7a4c24
TE		 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)
59ee2361
TE		 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;
1c7a4c24 237 cmd->mdaa_params = params;
59ee2361
TE		 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)
26042530 257 pr_err("in_configure_hw failed: %d\n", rc);
59ee2361
TE		 258
259 return rc;
260}
261
1c7a4c24
TE		 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)
26042530 268 pr_err("tg_configure_hw failed: %d\n", rc);
1c7a4c24
TE		 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
2c66daec
TE		 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
8c0695e4
TE		 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
7d0911c0
TE		 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
a381d482
MG		 336 case NFC_PROTO_ISO15693:
337 framing = NFC_DIGITAL_FRAMING_ISO15693_TVT;
338 check_crc = digital_skb_check_crc_b;
339 add_crc = digital_skb_add_crc_b;
340 break;
341
2c66daec 342 default:
26042530 343 pr_err("Invalid protocol %d\n", protocol);
2c66daec
TE		 344 return -EINVAL;
345 }
346
26042530 347 pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);
2c66daec
TE		 348
349 ddev->curr_rf_tech = rf_tech;
2c66daec
TE		 350
351 if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
352 ddev->skb_add_crc = digital_skb_add_crc_none;
353 ddev->skb_check_crc = digital_skb_check_crc_none;
354 } else {
355 ddev->skb_add_crc = add_crc;
356 ddev->skb_check_crc = check_crc;
357 }
358
359 rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing);
360 if (rc)
361 return rc;
362
363 target->supported_protocols = (1 << protocol);
364 rc = nfc_targets_found(ddev->nfc_dev, target, 1);
365 if (rc)
366 return rc;
367
368 ddev->poll_tech_count = 0;
369
370 return 0;
371}
372
59ee2361
TE		 373void digital_poll_next_tech(struct nfc_digital_dev *ddev)
374{
375 digital_switch_rf(ddev, 0);
376
377 mutex_lock(&ddev->poll_lock);
378
379 if (!ddev->poll_tech_count) {
380 mutex_unlock(&ddev->poll_lock);
381 return;
382 }
383
384 ddev->poll_tech_index = (ddev->poll_tech_index + 1) %
385 ddev->poll_tech_count;
386
387 mutex_unlock(&ddev->poll_lock);
388
389 schedule_work(&ddev->poll_work);
390}
391
392static void digital_wq_poll(struct work_struct *work)
393{
394 int rc;
395 struct digital_poll_tech *poll_tech;
396 struct nfc_digital_dev *ddev = container_of(work,
397 struct nfc_digital_dev,
398 poll_work);
399 mutex_lock(&ddev->poll_lock);
400
401 if (!ddev->poll_tech_count) {
402 mutex_unlock(&ddev->poll_lock);
403 return;
404 }
405
406 poll_tech = &ddev->poll_techs[ddev->poll_tech_index];
407
408 mutex_unlock(&ddev->poll_lock);
409
410 rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
411 if (rc)
412 digital_poll_next_tech(ddev);
413}
414
415static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
416 digital_poll_t poll_func)
417{
418 struct digital_poll_tech *poll_tech;
419
420 if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
421 return;
422
423 poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];
424
425 poll_tech->rf_tech = rf_tech;
426 poll_tech->poll_func = poll_func;
427}
428
429/**
430 * start_poll operation
431 *
432 * For every supported protocol, the corresponding polling function is added
433 * to the table of polling technologies (ddev->poll_techs[]) using
434 * digital_add_poll_tech().
435 * When a polling function fails (by timeout or protocol error) the next one is
436 * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
437 */
4b10884e
TE		 438static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
439 __u32 tm_protocols)
440{
59ee2361
TE		 441 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
442 u32 matching_im_protocols, matching_tm_protocols;
443
26042530 444 pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols,
c5da0e4a 445 tm_protocols, ddev->protocols);
59ee2361
TE		 446
447 matching_im_protocols = ddev->protocols & im_protocols;
448 matching_tm_protocols = ddev->protocols & tm_protocols;
449
450 if (!matching_im_protocols && !matching_tm_protocols) {
26042530 451 pr_err("Unknown protocol\n");
59ee2361
TE		 452 return -EINVAL;
453 }
454
455 if (ddev->poll_tech_count) {
26042530 456 pr_err("Already polling\n");
59ee2361
TE		 457 return -EBUSY;
458 }
459
460 if (ddev->curr_protocol) {
26042530 461 pr_err("A target is already active\n");
59ee2361
TE		 462 return -EBUSY;
463 }
464
465 ddev->poll_tech_count = 0;
466 ddev->poll_tech_index = 0;
467
468 if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
469 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
470 digital_in_send_sens_req);
471
8c0695e4
TE		 472 if (im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
473 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
474 digital_in_send_sensf_req);
475
476 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
477 digital_in_send_sensf_req);
478 }
479
a381d482
MG		 480 if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH)
481 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693,
482 digital_in_send_iso15693_inv_req);
483
1c7a4c24
TE		 484 if (tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
485 if (ddev->ops->tg_listen_mdaa) {
486 digital_add_poll_tech(ddev, 0,
487 digital_tg_listen_mdaa);
488 } else {
489 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
490 digital_tg_listen_nfca);
491
492 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
493 digital_tg_listen_nfcf);
494
495 digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
496 digital_tg_listen_nfcf);
497 }
498 }
499
59ee2361 500 if (!ddev->poll_tech_count) {
26042530 501 pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n",
59ee2361
TE		 502 matching_im_protocols, matching_tm_protocols);
503 return -EINVAL;
504 }
505
506 schedule_work(&ddev->poll_work);
507
508 return 0;
4b10884e
TE		 509}
510
511static void digital_stop_poll(struct nfc_dev *nfc_dev)
512{
59ee2361
TE		 513 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
514
515 mutex_lock(&ddev->poll_lock);
516
517 if (!ddev->poll_tech_count) {
26042530 518 pr_err("Polling operation was not running\n");
59ee2361
TE		 519 mutex_unlock(&ddev->poll_lock);
520 return;
521 }
522
523 ddev->poll_tech_count = 0;
524
525 mutex_unlock(&ddev->poll_lock);
526
527 cancel_work_sync(&ddev->poll_work);
528
529 digital_abort_cmd(ddev);
4b10884e
TE		 530}
531
532static int digital_dev_up(struct nfc_dev *nfc_dev)
533{
59ee2361
TE		 534 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
535
536 digital_switch_rf(ddev, 1);
537
538 return 0;
4b10884e
TE		 539}
540
541static int digital_dev_down(struct nfc_dev *nfc_dev)
542{
59ee2361
TE		 543 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
544
545 digital_switch_rf(ddev, 0);
546
547 return 0;
4b10884e
TE		 548}
549
550static int digital_dep_link_up(struct nfc_dev *nfc_dev,
551 struct nfc_target *target,
552 __u8 comm_mode, __u8 *gb, size_t gb_len)
553{
7d0911c0 554 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
48e10445
TE		 555 int rc;
556
557 rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
7d0911c0 558
48e10445
TE		 559 if (!rc)
560 ddev->curr_protocol = NFC_PROTO_NFC_DEP;
561
562 return rc;
4b10884e
TE		 563}
564
565static int digital_dep_link_down(struct nfc_dev *nfc_dev)
566{
7d0911c0
TE		 567 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
568
569 ddev->curr_protocol = 0;
570
571 return 0;
4b10884e
TE		 572}
573
574static int digital_activate_target(struct nfc_dev *nfc_dev,
575 struct nfc_target *target, __u32 protocol)
576{
48e10445
TE		 577 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
578
579 if (ddev->poll_tech_count) {
580 pr_err("Can't activate a target while polling\n");
581 return -EBUSY;
582 }
583
584 if (ddev->curr_protocol) {
585 pr_err("A target is already active\n");
586 return -EBUSY;
587 }
588
589 ddev->curr_protocol = protocol;
590
59ee2361 591 return 0;
4b10884e
TE		 592}
593
594static void digital_deactivate_target(struct nfc_dev *nfc_dev,
595 struct nfc_target *target)
596{
59ee2361
TE		 597 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
598
48e10445
TE		 599 if (!ddev->curr_protocol) {
600 pr_err("No active target\n");
601 return;
602 }
603
59ee2361 604 ddev->curr_protocol = 0;
4b10884e
TE		 605}
606
607static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb)
608{
1c7a4c24
TE		 609 struct nfc_digital_dev *ddev = nfc_get_drvdata(dev);
610
611 return digital_tg_send_dep_res(ddev, skb);
4b10884e
TE		 612}
613
2c66daec
TE		 614static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg,
615 struct sk_buff *resp)
616{
617 struct digital_data_exch *data_exch = arg;
618 int rc;
619
620 if (IS_ERR(resp)) {
621 rc = PTR_ERR(resp);
622 goto done;
623 }
624
625 if (ddev->curr_protocol == NFC_PROTO_MIFARE)
626 rc = digital_in_recv_mifare_res(resp);
627 else
628 rc = ddev->skb_check_crc(resp);
629
630 if (rc) {
631 kfree_skb(resp);
632 resp = NULL;
633 }
634
635done:
636 data_exch->cb(data_exch->cb_context, resp, rc);
637
638 kfree(data_exch);
639}
640
4b10884e
TE		 641static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target,
642 struct sk_buff *skb, data_exchange_cb_t cb,
643 void *cb_context)
644{
2c66daec
TE		 645 struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
646 struct digital_data_exch *data_exch;
647
648 data_exch = kzalloc(sizeof(struct digital_data_exch), GFP_KERNEL);
649 if (!data_exch) {
26042530 650 pr_err("Failed to allocate data_exch struct\n");
2c66daec
TE		 651 return -ENOMEM;
652 }
653
654 data_exch->cb = cb;
655 data_exch->cb_context = cb_context;
656
7d0911c0
TE		 657 if (ddev->curr_protocol == NFC_PROTO_NFC_DEP)
658 return digital_in_send_dep_req(ddev, target, skb, data_exch);
659
2c66daec
TE		 660 ddev->skb_add_crc(skb);
661
662 return digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
663 data_exch);
4b10884e
TE		 664}
665
666static struct nfc_ops digital_nfc_ops = {
667 .dev_up = digital_dev_up,
668 .dev_down = digital_dev_down,
669 .start_poll = digital_start_poll,
670 .stop_poll = digital_stop_poll,
671 .dep_link_up = digital_dep_link_up,
672 .dep_link_down = digital_dep_link_down,
673 .activate_target = digital_activate_target,
674 .deactivate_target = digital_deactivate_target,
675 .tm_send = digital_tg_send,
676 .im_transceive = digital_in_send,
677};
678
679struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
680 __u32 supported_protocols,
681 __u32 driver_capabilities,
682 int tx_headroom, int tx_tailroom)
683{
684 struct nfc_digital_dev *ddev;
685
686 if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen ||
687 !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd ||
688 !ops->switch_rf)
689 return NULL;
690
691 ddev = kzalloc(sizeof(struct nfc_digital_dev), GFP_KERNEL);
26042530 692 if (!ddev)
4b10884e 693 return NULL;
4b10884e
TE		 694
695 ddev->driver_capabilities = driver_capabilities;
696 ddev->ops = ops;
697
59ee2361
TE		 698 mutex_init(&ddev->cmd_lock);
699 INIT_LIST_HEAD(&ddev->cmd_queue);
700
701 INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
702 INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
703
704 mutex_init(&ddev->poll_lock);
705 INIT_WORK(&ddev->poll_work, digital_wq_poll);
706
707 if (supported_protocols & NFC_PROTO_JEWEL_MASK)
708 ddev->protocols |= NFC_PROTO_JEWEL_MASK;
709 if (supported_protocols & NFC_PROTO_MIFARE_MASK)
710 ddev->protocols |= NFC_PROTO_MIFARE_MASK;
8c0695e4
TE		 711 if (supported_protocols & NFC_PROTO_FELICA_MASK)
712 ddev->protocols |= NFC_PROTO_FELICA_MASK;
7d0911c0
TE		 713 if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
714 ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
a381d482
MG		 715 if (supported_protocols & NFC_PROTO_ISO15693_MASK)
716 ddev->protocols |= NFC_PROTO_ISO15693_MASK;
59ee2361
TE		 717
718 ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
719 ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
4b10884e
TE		 720
721 ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
722 ddev->tx_headroom,
723 ddev->tx_tailroom);
724 if (!ddev->nfc_dev) {
26042530 725 pr_err("nfc_allocate_device failed\n");
4b10884e
TE		 726 goto free_dev;
727 }
728
729 nfc_set_drvdata(ddev->nfc_dev, ddev);
730
731 return ddev;
732
733free_dev:
734 kfree(ddev);
735
736 return NULL;
737}
738EXPORT_SYMBOL(nfc_digital_allocate_device);
739
740void nfc_digital_free_device(struct nfc_digital_dev *ddev)
741{
742 nfc_free_device(ddev->nfc_dev);
4b10884e
TE		 743 kfree(ddev);
744}
745EXPORT_SYMBOL(nfc_digital_free_device);
746
747int nfc_digital_register_device(struct nfc_digital_dev *ddev)
748{
749 return nfc_register_device(ddev->nfc_dev);
750}
751EXPORT_SYMBOL(nfc_digital_register_device);
752
753void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
754{
59ee2361
TE		 755 struct digital_cmd *cmd, *n;
756
4b10884e 757 nfc_unregister_device(ddev->nfc_dev);
59ee2361
TE		 758
759 mutex_lock(&ddev->poll_lock);
760 ddev->poll_tech_count = 0;
761 mutex_unlock(&ddev->poll_lock);
762
763 cancel_work_sync(&ddev->poll_work);
764 cancel_work_sync(&ddev->cmd_work);
765 cancel_work_sync(&ddev->cmd_complete_work);
766
767 list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
768 list_del(&cmd->queue);
1c7a4c24 769 kfree(cmd->mdaa_params);
59ee2361
TE		 770 kfree(cmd);
771 }
4b10884e
TE		 772}
773EXPORT_SYMBOL(nfc_digital_unregister_device);
774
775MODULE_LICENSE("GPL");
Linux kernel - Deliverables
This page took 0.078517 seconds and 5 git commands to generate.