]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/nfc/pn533/pn533.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'gvt-fixes-2017-05-11' of https://github.com/01org/gvt-linux into drm-intel...
[mirror_ubuntu-artful-kernel.git] / drivers / nfc / pn533 / pn533.c
1 /*
2 * Driver for NXP PN533 NFC Chip - core functions
3 *
4 * Copyright (C) 2011 Instituto Nokia de Tecnologia
5 * Copyright (C) 2012-2013 Tieto Poland
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include <linux/device.h>
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/nfc.h>
26 #include <linux/netdevice.h>
27 #include <net/nfc/nfc.h>
28 #include "pn533.h"
29
30 #define VERSION "0.3"
31
32 /* How much time we spend listening for initiators */
33 #define PN533_LISTEN_TIME 2
34 /* Delay between each poll frame (ms) */
35 #define PN533_POLL_INTERVAL 10
36
37 /* structs for pn533 commands */
38
39 /* PN533_CMD_GET_FIRMWARE_VERSION */
40 struct pn533_fw_version {
41 u8 ic;
42 u8 ver;
43 u8 rev;
44 u8 support;
45 };
46
47 /* PN533_CMD_RF_CONFIGURATION */
48 #define PN533_CFGITEM_RF_FIELD 0x01
49 #define PN533_CFGITEM_TIMING 0x02
50 #define PN533_CFGITEM_MAX_RETRIES 0x05
51 #define PN533_CFGITEM_PASORI 0x82
52
53 #define PN533_CFGITEM_RF_FIELD_AUTO_RFCA 0x2
54 #define PN533_CFGITEM_RF_FIELD_ON 0x1
55 #define PN533_CFGITEM_RF_FIELD_OFF 0x0
56
57 #define PN533_CONFIG_TIMING_102 0xb
58 #define PN533_CONFIG_TIMING_204 0xc
59 #define PN533_CONFIG_TIMING_409 0xd
60 #define PN533_CONFIG_TIMING_819 0xe
61
62 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
63 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
64
65 struct pn533_config_max_retries {
66 u8 mx_rty_atr;
67 u8 mx_rty_psl;
68 u8 mx_rty_passive_act;
69 } __packed;
70
71 struct pn533_config_timing {
72 u8 rfu;
73 u8 atr_res_timeout;
74 u8 dep_timeout;
75 } __packed;
76
77 /* PN533_CMD_IN_LIST_PASSIVE_TARGET */
78
79 /* felica commands opcode */
80 #define PN533_FELICA_OPC_SENSF_REQ 0
81 #define PN533_FELICA_OPC_SENSF_RES 1
82 /* felica SENSF_REQ parameters */
83 #define PN533_FELICA_SENSF_SC_ALL 0xFFFF
84 #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
85 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
86 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
87
88 /* type B initiator_data values */
89 #define PN533_TYPE_B_AFI_ALL_FAMILIES 0
90 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
91 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
92
93 union pn533_cmd_poll_initdata {
94 struct {
95 u8 afi;
96 u8 polling_method;
97 } __packed type_b;
98 struct {
99 u8 opcode;
100 __be16 sc;
101 u8 rc;
102 u8 tsn;
103 } __packed felica;
104 };
105
106 struct pn533_poll_modulations {
107 struct {
108 u8 maxtg;
109 u8 brty;
110 union pn533_cmd_poll_initdata initiator_data;
111 } __packed data;
112 u8 len;
113 };
114
115 static const struct pn533_poll_modulations poll_mod[] = {
116 [PN533_POLL_MOD_106KBPS_A] = {
117 .data = {
118 .maxtg = 1,
119 .brty = 0,
120 },
121 .len = 2,
122 },
123 [PN533_POLL_MOD_212KBPS_FELICA] = {
124 .data = {
125 .maxtg = 1,
126 .brty = 1,
127 .initiator_data.felica = {
128 .opcode = PN533_FELICA_OPC_SENSF_REQ,
129 .sc = PN533_FELICA_SENSF_SC_ALL,
130 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
131 .tsn = 0x03,
132 },
133 },
134 .len = 7,
135 },
136 [PN533_POLL_MOD_424KBPS_FELICA] = {
137 .data = {
138 .maxtg = 1,
139 .brty = 2,
140 .initiator_data.felica = {
141 .opcode = PN533_FELICA_OPC_SENSF_REQ,
142 .sc = PN533_FELICA_SENSF_SC_ALL,
143 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
144 .tsn = 0x03,
145 },
146 },
147 .len = 7,
148 },
149 [PN533_POLL_MOD_106KBPS_JEWEL] = {
150 .data = {
151 .maxtg = 1,
152 .brty = 4,
153 },
154 .len = 2,
155 },
156 [PN533_POLL_MOD_847KBPS_B] = {
157 .data = {
158 .maxtg = 1,
159 .brty = 8,
160 .initiator_data.type_b = {
161 .afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
162 .polling_method =
163 PN533_TYPE_B_POLL_METHOD_TIMESLOT,
164 },
165 },
166 .len = 3,
167 },
168 [PN533_LISTEN_MOD] = {
169 .len = 0,
170 },
171 };
172
173 /* PN533_CMD_IN_ATR */
174
175 struct pn533_cmd_activate_response {
176 u8 status;
177 u8 nfcid3t[10];
178 u8 didt;
179 u8 bst;
180 u8 brt;
181 u8 to;
182 u8 ppt;
183 /* optional */
184 u8 gt[];
185 } __packed;
186
187 struct pn533_cmd_jump_dep_response {
188 u8 status;
189 u8 tg;
190 u8 nfcid3t[10];
191 u8 didt;
192 u8 bst;
193 u8 brt;
194 u8 to;
195 u8 ppt;
196 /* optional */
197 u8 gt[];
198 } __packed;
199
200
201 /* PN533_TG_INIT_AS_TARGET */
202 #define PN533_INIT_TARGET_PASSIVE 0x1
203 #define PN533_INIT_TARGET_DEP 0x2
204
205 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
206 #define PN533_INIT_TARGET_RESP_ACTIVE 0x1
207 #define PN533_INIT_TARGET_RESP_DEP 0x4
208
209 /* The rule: value(high byte) + value(low byte) + checksum = 0 */
210 static inline u8 pn533_ext_checksum(u16 value)
211 {
212 return ~(u8)(((value & 0xFF00) >> 8) + (u8)(value & 0xFF)) + 1;
213 }
214
215 /* The rule: value + checksum = 0 */
216 static inline u8 pn533_std_checksum(u8 value)
217 {
218 return ~value + 1;
219 }
220
221 /* The rule: sum(data elements) + checksum = 0 */
222 static u8 pn533_std_data_checksum(u8 *data, int datalen)
223 {
224 u8 sum = 0;
225 int i;
226
227 for (i = 0; i < datalen; i++)
228 sum += data[i];
229
230 return pn533_std_checksum(sum);
231 }
232
233 static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code)
234 {
235 struct pn533_std_frame *frame = _frame;
236
237 frame->preamble = 0;
238 frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF);
239 PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT;
240 PN533_FRAME_CMD(frame) = cmd_code;
241 frame->datalen = 2;
242 }
243
244 static void pn533_std_tx_frame_finish(void *_frame)
245 {
246 struct pn533_std_frame *frame = _frame;
247
248 frame->datalen_checksum = pn533_std_checksum(frame->datalen);
249
250 PN533_STD_FRAME_CHECKSUM(frame) =
251 pn533_std_data_checksum(frame->data, frame->datalen);
252
253 PN533_STD_FRAME_POSTAMBLE(frame) = 0;
254 }
255
256 static void pn533_std_tx_update_payload_len(void *_frame, int len)
257 {
258 struct pn533_std_frame *frame = _frame;
259
260 frame->datalen += len;
261 }
262
263 static bool pn533_std_rx_frame_is_valid(void *_frame, struct pn533 *dev)
264 {
265 u8 checksum;
266 struct pn533_std_frame *stdf = _frame;
267
268 if (stdf->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
269 return false;
270
271 if (likely(!PN533_STD_IS_EXTENDED(stdf))) {
272 /* Standard frame code */
273 dev->ops->rx_header_len = PN533_STD_FRAME_HEADER_LEN;
274
275 checksum = pn533_std_checksum(stdf->datalen);
276 if (checksum != stdf->datalen_checksum)
277 return false;
278
279 checksum = pn533_std_data_checksum(stdf->data, stdf->datalen);
280 if (checksum != PN533_STD_FRAME_CHECKSUM(stdf))
281 return false;
282 } else {
283 /* Extended */
284 struct pn533_ext_frame *eif = _frame;
285
286 dev->ops->rx_header_len = PN533_EXT_FRAME_HEADER_LEN;
287
288 checksum = pn533_ext_checksum(be16_to_cpu(eif->datalen));
289 if (checksum != eif->datalen_checksum)
290 return false;
291
292 /* check data checksum */
293 checksum = pn533_std_data_checksum(eif->data,
294 be16_to_cpu(eif->datalen));
295 if (checksum != PN533_EXT_FRAME_CHECKSUM(eif))
296 return false;
297 }
298
299 return true;
300 }
301
302 bool pn533_rx_frame_is_ack(void *_frame)
303 {
304 struct pn533_std_frame *frame = _frame;
305
306 if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
307 return false;
308
309 if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
310 return false;
311
312 return true;
313 }
314 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_ack);
315
316 static inline int pn533_std_rx_frame_size(void *frame)
317 {
318 struct pn533_std_frame *f = frame;
319
320 /* check for Extended Information frame */
321 if (PN533_STD_IS_EXTENDED(f)) {
322 struct pn533_ext_frame *eif = frame;
323
324 return sizeof(struct pn533_ext_frame)
325 + be16_to_cpu(eif->datalen) + PN533_STD_FRAME_TAIL_LEN;
326 }
327
328 return sizeof(struct pn533_std_frame) + f->datalen +
329 PN533_STD_FRAME_TAIL_LEN;
330 }
331
332 static u8 pn533_std_get_cmd_code(void *frame)
333 {
334 struct pn533_std_frame *f = frame;
335 struct pn533_ext_frame *eif = frame;
336
337 if (PN533_STD_IS_EXTENDED(f))
338 return PN533_FRAME_CMD(eif);
339 else
340 return PN533_FRAME_CMD(f);
341 }
342
343 bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
344 {
345 return (dev->ops->get_cmd_code(frame) ==
346 PN533_CMD_RESPONSE(dev->cmd->code));
347 }
348 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_cmd_response);
349
350
351 static struct pn533_frame_ops pn533_std_frame_ops = {
352 .tx_frame_init = pn533_std_tx_frame_init,
353 .tx_frame_finish = pn533_std_tx_frame_finish,
354 .tx_update_payload_len = pn533_std_tx_update_payload_len,
355 .tx_header_len = PN533_STD_FRAME_HEADER_LEN,
356 .tx_tail_len = PN533_STD_FRAME_TAIL_LEN,
357
358 .rx_is_frame_valid = pn533_std_rx_frame_is_valid,
359 .rx_frame_size = pn533_std_rx_frame_size,
360 .rx_header_len = PN533_STD_FRAME_HEADER_LEN,
361 .rx_tail_len = PN533_STD_FRAME_TAIL_LEN,
362
363 .max_payload_len = PN533_STD_FRAME_MAX_PAYLOAD_LEN,
364 .get_cmd_code = pn533_std_get_cmd_code,
365 };
366
367 static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
368 struct sk_buff *skb)
369 {
370 /* payload is already there, just update datalen */
371 int payload_len = skb->len;
372 struct pn533_frame_ops *ops = dev->ops;
373
374
375 skb_push(skb, ops->tx_header_len);
376 skb_put(skb, ops->tx_tail_len);
377
378 ops->tx_frame_init(skb->data, cmd_code);
379 ops->tx_update_payload_len(skb->data, payload_len);
380 ops->tx_frame_finish(skb->data);
381 }
382
383 static int pn533_send_async_complete(struct pn533 *dev)
384 {
385 struct pn533_cmd *cmd = dev->cmd;
386 struct sk_buff *resp;
387 int status, rc = 0;
388
389 if (!cmd) {
390 dev_dbg(dev->dev, "%s: cmd not set\n", __func__);
391 goto done;
392 }
393
394 dev_kfree_skb(cmd->req);
395
396 status = cmd->status;
397 resp = cmd->resp;
398
399 if (status < 0) {
400 rc = cmd->complete_cb(dev, cmd->complete_cb_context,
401 ERR_PTR(status));
402 dev_kfree_skb(resp);
403 goto done;
404 }
405
406 /* when no response is set we got interrupted */
407 if (!resp)
408 resp = ERR_PTR(-EINTR);
409
410 if (!IS_ERR(resp)) {
411 skb_pull(resp, dev->ops->rx_header_len);
412 skb_trim(resp, resp->len - dev->ops->rx_tail_len);
413 }
414
415 rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp);
416
417 done:
418 kfree(cmd);
419 dev->cmd = NULL;
420 return rc;
421 }
422
423 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
424 struct sk_buff *req,
425 pn533_send_async_complete_t complete_cb,
426 void *complete_cb_context)
427 {
428 struct pn533_cmd *cmd;
429 int rc = 0;
430
431 dev_dbg(dev->dev, "Sending command 0x%x\n", cmd_code);
432
433 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
434 if (!cmd)
435 return -ENOMEM;
436
437 cmd->code = cmd_code;
438 cmd->req = req;
439 cmd->complete_cb = complete_cb;
440 cmd->complete_cb_context = complete_cb_context;
441
442 pn533_build_cmd_frame(dev, cmd_code, req);
443
444 mutex_lock(&dev->cmd_lock);
445
446 if (!dev->cmd_pending) {
447 dev->cmd = cmd;
448 rc = dev->phy_ops->send_frame(dev, req);
449 if (rc) {
450 dev->cmd = NULL;
451 goto error;
452 }
453
454 dev->cmd_pending = 1;
455 goto unlock;
456 }
457
458 dev_dbg(dev->dev, "%s Queueing command 0x%x\n",
459 __func__, cmd_code);
460
461 INIT_LIST_HEAD(&cmd->queue);
462 list_add_tail(&cmd->queue, &dev->cmd_queue);
463
464 goto unlock;
465
466 error:
467 kfree(cmd);
468 unlock:
469 mutex_unlock(&dev->cmd_lock);
470 return rc;
471 }
472
473 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
474 struct sk_buff *req,
475 pn533_send_async_complete_t complete_cb,
476 void *complete_cb_context)
477 {
478 int rc;
479
480 rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
481 complete_cb_context);
482
483 return rc;
484 }
485
486 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
487 struct sk_buff *req,
488 pn533_send_async_complete_t complete_cb,
489 void *complete_cb_context)
490 {
491 int rc;
492
493 rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
494 complete_cb_context);
495
496 return rc;
497 }
498
499 /*
500 * pn533_send_cmd_direct_async
501 *
502 * The function sends a piority cmd directly to the chip omitting the cmd
503 * queue. It's intended to be used by chaining mechanism of received responses
504 * where the host has to request every single chunk of data before scheduling
505 * next cmd from the queue.
506 */
507 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
508 struct sk_buff *req,
509 pn533_send_async_complete_t complete_cb,
510 void *complete_cb_context)
511 {
512 struct pn533_cmd *cmd;
513 int rc;
514
515 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
516 if (!cmd)
517 return -ENOMEM;
518
519 cmd->code = cmd_code;
520 cmd->req = req;
521 cmd->complete_cb = complete_cb;
522 cmd->complete_cb_context = complete_cb_context;
523
524 pn533_build_cmd_frame(dev, cmd_code, req);
525
526 dev->cmd = cmd;
527 rc = dev->phy_ops->send_frame(dev, req);
528 if (rc < 0) {
529 dev->cmd = NULL;
530 kfree(cmd);
531 }
532
533 return rc;
534 }
535
536 static void pn533_wq_cmd_complete(struct work_struct *work)
537 {
538 struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
539 int rc;
540
541 rc = pn533_send_async_complete(dev);
542 if (rc != -EINPROGRESS)
543 queue_work(dev->wq, &dev->cmd_work);
544 }
545
546 static void pn533_wq_cmd(struct work_struct *work)
547 {
548 struct pn533 *dev = container_of(work, struct pn533, cmd_work);
549 struct pn533_cmd *cmd;
550 int rc;
551
552 mutex_lock(&dev->cmd_lock);
553
554 if (list_empty(&dev->cmd_queue)) {
555 dev->cmd_pending = 0;
556 mutex_unlock(&dev->cmd_lock);
557 return;
558 }
559
560 cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
561
562 list_del(&cmd->queue);
563
564 mutex_unlock(&dev->cmd_lock);
565
566 dev->cmd = cmd;
567 rc = dev->phy_ops->send_frame(dev, cmd->req);
568 if (rc < 0) {
569 dev->cmd = NULL;
570 dev_kfree_skb(cmd->req);
571 kfree(cmd);
572 return;
573 }
574
575 }
576
577 struct pn533_sync_cmd_response {
578 struct sk_buff *resp;
579 struct completion done;
580 };
581
582 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
583 struct sk_buff *resp)
584 {
585 struct pn533_sync_cmd_response *arg = _arg;
586
587 arg->resp = resp;
588 complete(&arg->done);
589
590 return 0;
591 }
592
593 /* pn533_send_cmd_sync
594 *
595 * Please note the req parameter is freed inside the function to
596 * limit a number of return value interpretations by the caller.
597 *
598 * 1. negative in case of error during TX path -> req should be freed
599 *
600 * 2. negative in case of error during RX path -> req should not be freed
601 * as it's been already freed at the beginning of RX path by
602 * async_complete_cb.
603 *
604 * 3. valid pointer in case of succesfult RX path
605 *
606 * A caller has to check a return value with IS_ERR macro. If the test pass,
607 * the returned pointer is valid.
608 *
609 */
610 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
611 struct sk_buff *req)
612 {
613 int rc;
614 struct pn533_sync_cmd_response arg;
615
616 init_completion(&arg.done);
617
618 rc = pn533_send_cmd_async(dev, cmd_code, req,
619 pn533_send_sync_complete, &arg);
620 if (rc) {
621 dev_kfree_skb(req);
622 return ERR_PTR(rc);
623 }
624
625 wait_for_completion(&arg.done);
626
627 return arg.resp;
628 }
629
630 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
631 {
632 struct sk_buff *skb;
633
634 skb = alloc_skb(dev->ops->tx_header_len +
635 size +
636 dev->ops->tx_tail_len, GFP_KERNEL);
637
638 if (skb)
639 skb_reserve(skb, dev->ops->tx_header_len);
640
641 return skb;
642 }
643
644 struct pn533_target_type_a {
645 __be16 sens_res;
646 u8 sel_res;
647 u8 nfcid_len;
648 u8 nfcid_data[];
649 } __packed;
650
651
652 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
653 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
654 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
655
656 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
657 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
658
659 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
660 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
661
662 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
663 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
664 #define PN533_TYPE_A_SEL_PROT_DEP 2
665 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
666
667 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
668 int target_data_len)
669 {
670 u8 ssd;
671 u8 platconf;
672
673 if (target_data_len < sizeof(struct pn533_target_type_a))
674 return false;
675
676 /*
677 * The length check of nfcid[] and ats[] are not being performed because
678 * the values are not being used
679 */
680
681 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
682 ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
683 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
684
685 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
686 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
687 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
688 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
689 return false;
690
691 /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
692 if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
693 return false;
694
695 return true;
696 }
697
698 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
699 int tgt_data_len)
700 {
701 struct pn533_target_type_a *tgt_type_a;
702
703 tgt_type_a = (struct pn533_target_type_a *)tgt_data;
704
705 if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
706 return -EPROTO;
707
708 switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
709 case PN533_TYPE_A_SEL_PROT_MIFARE:
710 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
711 break;
712 case PN533_TYPE_A_SEL_PROT_ISO14443:
713 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
714 break;
715 case PN533_TYPE_A_SEL_PROT_DEP:
716 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
717 break;
718 case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
719 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
720 NFC_PROTO_NFC_DEP_MASK;
721 break;
722 }
723
724 nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
725 nfc_tgt->sel_res = tgt_type_a->sel_res;
726 nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
727 memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
728
729 return 0;
730 }
731
732 struct pn533_target_felica {
733 u8 pol_res;
734 u8 opcode;
735 u8 nfcid2[NFC_NFCID2_MAXSIZE];
736 u8 pad[8];
737 /* optional */
738 u8 syst_code[];
739 } __packed;
740
741 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
742 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
743
744 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
745 int target_data_len)
746 {
747 if (target_data_len < sizeof(struct pn533_target_felica))
748 return false;
749
750 if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
751 return false;
752
753 return true;
754 }
755
756 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
757 int tgt_data_len)
758 {
759 struct pn533_target_felica *tgt_felica;
760
761 tgt_felica = (struct pn533_target_felica *)tgt_data;
762
763 if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
764 return -EPROTO;
765
766 if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
767 (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
768 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
769 else
770 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
771
772 memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
773 nfc_tgt->sensf_res_len = 9;
774
775 memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
776 nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
777
778 return 0;
779 }
780
781 struct pn533_target_jewel {
782 __be16 sens_res;
783 u8 jewelid[4];
784 } __packed;
785
786 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
787 int target_data_len)
788 {
789 u8 ssd;
790 u8 platconf;
791
792 if (target_data_len < sizeof(struct pn533_target_jewel))
793 return false;
794
795 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
796 ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
797 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
798
799 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
800 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
801 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
802 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
803 return false;
804
805 return true;
806 }
807
808 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
809 int tgt_data_len)
810 {
811 struct pn533_target_jewel *tgt_jewel;
812
813 tgt_jewel = (struct pn533_target_jewel *)tgt_data;
814
815 if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
816 return -EPROTO;
817
818 nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
819 nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
820 nfc_tgt->nfcid1_len = 4;
821 memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
822
823 return 0;
824 }
825
826 struct pn533_type_b_prot_info {
827 u8 bitrate;
828 u8 fsci_type;
829 u8 fwi_adc_fo;
830 } __packed;
831
832 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
833 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
834 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
835
836 struct pn533_type_b_sens_res {
837 u8 opcode;
838 u8 nfcid[4];
839 u8 appdata[4];
840 struct pn533_type_b_prot_info prot_info;
841 } __packed;
842
843 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
844
845 struct pn533_target_type_b {
846 struct pn533_type_b_sens_res sensb_res;
847 u8 attrib_res_len;
848 u8 attrib_res[];
849 } __packed;
850
851 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
852 int target_data_len)
853 {
854 if (target_data_len < sizeof(struct pn533_target_type_b))
855 return false;
856
857 if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
858 return false;
859
860 if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
861 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
862 return false;
863
864 return true;
865 }
866
867 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
868 int tgt_data_len)
869 {
870 struct pn533_target_type_b *tgt_type_b;
871
872 tgt_type_b = (struct pn533_target_type_b *)tgt_data;
873
874 if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
875 return -EPROTO;
876
877 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
878
879 return 0;
880 }
881
882 static void pn533_poll_reset_mod_list(struct pn533 *dev);
883 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
884 int tgdata_len)
885 {
886 struct nfc_target nfc_tgt;
887 int rc;
888
889 dev_dbg(dev->dev, "%s: modulation=%d\n",
890 __func__, dev->poll_mod_curr);
891
892 if (tg != 1)
893 return -EPROTO;
894
895 memset(&nfc_tgt, 0, sizeof(struct nfc_target));
896
897 switch (dev->poll_mod_curr) {
898 case PN533_POLL_MOD_106KBPS_A:
899 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
900 break;
901 case PN533_POLL_MOD_212KBPS_FELICA:
902 case PN533_POLL_MOD_424KBPS_FELICA:
903 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
904 break;
905 case PN533_POLL_MOD_106KBPS_JEWEL:
906 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
907 break;
908 case PN533_POLL_MOD_847KBPS_B:
909 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
910 break;
911 default:
912 nfc_err(dev->dev,
913 "Unknown current poll modulation\n");
914 return -EPROTO;
915 }
916
917 if (rc)
918 return rc;
919
920 if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
921 dev_dbg(dev->dev,
922 "The Tg found doesn't have the desired protocol\n");
923 return -EAGAIN;
924 }
925
926 dev_dbg(dev->dev,
927 "Target found - supported protocols: 0x%x\n",
928 nfc_tgt.supported_protocols);
929
930 dev->tgt_available_prots = nfc_tgt.supported_protocols;
931
932 pn533_poll_reset_mod_list(dev);
933 nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
934
935 return 0;
936 }
937
938 static inline void pn533_poll_next_mod(struct pn533 *dev)
939 {
940 dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
941 }
942
943 static void pn533_poll_reset_mod_list(struct pn533 *dev)
944 {
945 dev->poll_mod_count = 0;
946 }
947
948 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
949 {
950 dev->poll_mod_active[dev->poll_mod_count] =
951 (struct pn533_poll_modulations *)&poll_mod[mod_index];
952 dev->poll_mod_count++;
953 }
954
955 static void pn533_poll_create_mod_list(struct pn533 *dev,
956 u32 im_protocols, u32 tm_protocols)
957 {
958 pn533_poll_reset_mod_list(dev);
959
960 if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
961 (im_protocols & NFC_PROTO_ISO14443_MASK) ||
962 (im_protocols & NFC_PROTO_NFC_DEP_MASK))
963 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
964
965 if (im_protocols & NFC_PROTO_FELICA_MASK ||
966 im_protocols & NFC_PROTO_NFC_DEP_MASK) {
967 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
968 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
969 }
970
971 if (im_protocols & NFC_PROTO_JEWEL_MASK)
972 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
973
974 if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
975 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
976
977 if (tm_protocols)
978 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
979 }
980
981 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
982 {
983 u8 nbtg, tg, *tgdata;
984 int rc, tgdata_len;
985
986 /* Toggle the DEP polling */
987 if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK)
988 dev->poll_dep = 1;
989
990 nbtg = resp->data[0];
991 tg = resp->data[1];
992 tgdata = &resp->data[2];
993 tgdata_len = resp->len - 2; /* nbtg + tg */
994
995 if (nbtg) {
996 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
997
998 /* We must stop the poll after a valid target found */
999 if (rc == 0)
1000 return 0;
1001 }
1002
1003 return -EAGAIN;
1004 }
1005
1006 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1007 {
1008 struct sk_buff *skb;
1009 u8 *felica, *nfcid3, *gb;
1010
1011 u8 *gbytes = dev->gb;
1012 size_t gbytes_len = dev->gb_len;
1013
1014 u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1015 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1016 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1017 0xff, 0xff}; /* System code */
1018
1019 u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1020 0x0, 0x0, 0x0,
1021 0x40}; /* SEL_RES for DEP */
1022
1023 unsigned int skb_len = 36 + /*
1024 * mode (1), mifare (6),
1025 * felica (18), nfcid3 (10), gb_len (1)
1026 */
1027 gbytes_len +
1028 1; /* len Tk*/
1029
1030 skb = pn533_alloc_skb(dev, skb_len);
1031 if (!skb)
1032 return NULL;
1033
1034 /* DEP support only */
1035 *skb_put(skb, 1) = PN533_INIT_TARGET_DEP;
1036
1037 /* MIFARE params */
1038 memcpy(skb_put(skb, 6), mifare_params, 6);
1039
1040 /* Felica params */
1041 felica = skb_put(skb, 18);
1042 memcpy(felica, felica_params, 18);
1043 get_random_bytes(felica + 2, 6);
1044
1045 /* NFCID3 */
1046 nfcid3 = skb_put(skb, 10);
1047 memset(nfcid3, 0, 10);
1048 memcpy(nfcid3, felica, 8);
1049
1050 /* General bytes */
1051 *skb_put(skb, 1) = gbytes_len;
1052
1053 gb = skb_put(skb, gbytes_len);
1054 memcpy(gb, gbytes, gbytes_len);
1055
1056 /* Len Tk */
1057 *skb_put(skb, 1) = 0;
1058
1059 return skb;
1060 }
1061
1062 static void pn533_wq_tm_mi_recv(struct work_struct *work);
1063 static struct sk_buff *pn533_build_response(struct pn533 *dev);
1064
1065 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1066 struct sk_buff *resp)
1067 {
1068 struct sk_buff *skb;
1069 u8 status, ret, mi;
1070 int rc;
1071
1072 dev_dbg(dev->dev, "%s\n", __func__);
1073
1074 if (IS_ERR(resp)) {
1075 skb_queue_purge(&dev->resp_q);
1076 return PTR_ERR(resp);
1077 }
1078
1079 status = resp->data[0];
1080
1081 ret = status & PN533_CMD_RET_MASK;
1082 mi = status & PN533_CMD_MI_MASK;
1083
1084 skb_pull(resp, sizeof(status));
1085
1086 if (ret != PN533_CMD_RET_SUCCESS) {
1087 rc = -EIO;
1088 goto error;
1089 }
1090
1091 skb_queue_tail(&dev->resp_q, resp);
1092
1093 if (mi) {
1094 queue_work(dev->wq, &dev->mi_tm_rx_work);
1095 return -EINPROGRESS;
1096 }
1097
1098 skb = pn533_build_response(dev);
1099 if (!skb) {
1100 rc = -EIO;
1101 goto error;
1102 }
1103
1104 return nfc_tm_data_received(dev->nfc_dev, skb);
1105
1106 error:
1107 nfc_tm_deactivated(dev->nfc_dev);
1108 dev->tgt_mode = 0;
1109 skb_queue_purge(&dev->resp_q);
1110 dev_kfree_skb(resp);
1111
1112 return rc;
1113 }
1114
1115 static void pn533_wq_tm_mi_recv(struct work_struct *work)
1116 {
1117 struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work);
1118 struct sk_buff *skb;
1119 int rc;
1120
1121 dev_dbg(dev->dev, "%s\n", __func__);
1122
1123 skb = pn533_alloc_skb(dev, 0);
1124 if (!skb)
1125 return;
1126
1127 rc = pn533_send_cmd_direct_async(dev,
1128 PN533_CMD_TG_GET_DATA,
1129 skb,
1130 pn533_tm_get_data_complete,
1131 NULL);
1132
1133 if (rc < 0)
1134 dev_kfree_skb(skb);
1135 }
1136
1137 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
1138 struct sk_buff *resp);
1139 static void pn533_wq_tm_mi_send(struct work_struct *work)
1140 {
1141 struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
1142 struct sk_buff *skb;
1143 int rc;
1144
1145 dev_dbg(dev->dev, "%s\n", __func__);
1146
1147 /* Grab the first skb in the queue */
1148 skb = skb_dequeue(&dev->fragment_skb);
1149 if (skb == NULL) { /* No more data */
1150 /* Reset the queue for future use */
1151 skb_queue_head_init(&dev->fragment_skb);
1152 goto error;
1153 }
1154
1155 /* last entry - remove MI bit */
1156 if (skb_queue_len(&dev->fragment_skb) == 0) {
1157 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
1158 skb, pn533_tm_send_complete, NULL);
1159 } else
1160 rc = pn533_send_cmd_direct_async(dev,
1161 PN533_CMD_TG_SET_META_DATA,
1162 skb, pn533_tm_send_complete, NULL);
1163
1164 if (rc == 0) /* success */
1165 return;
1166
1167 dev_err(dev->dev,
1168 "Error %d when trying to perform set meta data_exchange", rc);
1169
1170 dev_kfree_skb(skb);
1171
1172 error:
1173 dev->phy_ops->send_ack(dev, GFP_KERNEL);
1174 queue_work(dev->wq, &dev->cmd_work);
1175 }
1176
1177 static void pn533_wq_tg_get_data(struct work_struct *work)
1178 {
1179 struct pn533 *dev = container_of(work, struct pn533, tg_work);
1180 struct sk_buff *skb;
1181 int rc;
1182
1183 dev_dbg(dev->dev, "%s\n", __func__);
1184
1185 skb = pn533_alloc_skb(dev, 0);
1186 if (!skb)
1187 return;
1188
1189 rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1190 pn533_tm_get_data_complete, NULL);
1191
1192 if (rc < 0)
1193 dev_kfree_skb(skb);
1194 }
1195
1196 #define ATR_REQ_GB_OFFSET 17
1197 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1198 {
1199 u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1200 size_t gb_len;
1201 int rc;
1202
1203 dev_dbg(dev->dev, "%s\n", __func__);
1204
1205 if (resp->len < ATR_REQ_GB_OFFSET + 1)
1206 return -EINVAL;
1207
1208 mode = resp->data[0];
1209 cmd = &resp->data[1];
1210
1211 dev_dbg(dev->dev, "Target mode 0x%x len %d\n",
1212 mode, resp->len);
1213
1214 if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1215 PN533_INIT_TARGET_RESP_ACTIVE)
1216 comm_mode = NFC_COMM_ACTIVE;
1217
1218 if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0) /* Only DEP supported */
1219 return -EOPNOTSUPP;
1220
1221 gb = cmd + ATR_REQ_GB_OFFSET;
1222 gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1223
1224 rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1225 comm_mode, gb, gb_len);
1226 if (rc < 0) {
1227 nfc_err(dev->dev,
1228 "Error when signaling target activation\n");
1229 return rc;
1230 }
1231
1232 dev->tgt_mode = 1;
1233 queue_work(dev->wq, &dev->tg_work);
1234
1235 return 0;
1236 }
1237
1238 static void pn533_listen_mode_timer(unsigned long data)
1239 {
1240 struct pn533 *dev = (struct pn533 *)data;
1241
1242 dev_dbg(dev->dev, "Listen mode timeout\n");
1243
1244 dev->cancel_listen = 1;
1245
1246 pn533_poll_next_mod(dev);
1247
1248 queue_delayed_work(dev->wq, &dev->poll_work,
1249 msecs_to_jiffies(PN533_POLL_INTERVAL));
1250 }
1251
1252 static int pn533_rf_complete(struct pn533 *dev, void *arg,
1253 struct sk_buff *resp)
1254 {
1255 int rc = 0;
1256
1257 dev_dbg(dev->dev, "%s\n", __func__);
1258
1259 if (IS_ERR(resp)) {
1260 rc = PTR_ERR(resp);
1261
1262 nfc_err(dev->dev, "RF setting error %d\n", rc);
1263
1264 return rc;
1265 }
1266
1267 queue_delayed_work(dev->wq, &dev->poll_work,
1268 msecs_to_jiffies(PN533_POLL_INTERVAL));
1269
1270 dev_kfree_skb(resp);
1271 return rc;
1272 }
1273
1274 static void pn533_wq_rf(struct work_struct *work)
1275 {
1276 struct pn533 *dev = container_of(work, struct pn533, rf_work);
1277 struct sk_buff *skb;
1278 int rc;
1279
1280 dev_dbg(dev->dev, "%s\n", __func__);
1281
1282 skb = pn533_alloc_skb(dev, 2);
1283 if (!skb)
1284 return;
1285
1286 *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD;
1287 *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
1288
1289 rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1290 pn533_rf_complete, NULL);
1291 if (rc < 0) {
1292 dev_kfree_skb(skb);
1293 nfc_err(dev->dev, "RF setting error %d\n", rc);
1294 }
1295 }
1296
1297 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg,
1298 struct sk_buff *resp)
1299 {
1300 struct pn533_cmd_jump_dep_response *rsp;
1301 struct nfc_target nfc_target;
1302 u8 target_gt_len;
1303 int rc;
1304
1305 if (IS_ERR(resp))
1306 return PTR_ERR(resp);
1307
1308 rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1309
1310 rc = rsp->status & PN533_CMD_RET_MASK;
1311 if (rc != PN533_CMD_RET_SUCCESS) {
1312 /* Not target found, turn radio off */
1313 queue_work(dev->wq, &dev->rf_work);
1314
1315 dev_kfree_skb(resp);
1316 return 0;
1317 }
1318
1319 dev_dbg(dev->dev, "Creating new target");
1320
1321 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1322 nfc_target.nfcid1_len = 10;
1323 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1324 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1325 if (rc)
1326 goto error;
1327
1328 dev->tgt_available_prots = 0;
1329 dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1330
1331 /* ATR_RES general bytes are located at offset 17 */
1332 target_gt_len = resp->len - 17;
1333 rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1334 rsp->gt, target_gt_len);
1335 if (!rc) {
1336 rc = nfc_dep_link_is_up(dev->nfc_dev,
1337 dev->nfc_dev->targets[0].idx,
1338 0, NFC_RF_INITIATOR);
1339
1340 if (!rc)
1341 pn533_poll_reset_mod_list(dev);
1342 }
1343 error:
1344 dev_kfree_skb(resp);
1345 return rc;
1346 }
1347
1348 #define PASSIVE_DATA_LEN 5
1349 static int pn533_poll_dep(struct nfc_dev *nfc_dev)
1350 {
1351 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1352 struct sk_buff *skb;
1353 int rc, skb_len;
1354 u8 *next, nfcid3[NFC_NFCID3_MAXSIZE];
1355 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1356
1357 dev_dbg(dev->dev, "%s", __func__);
1358
1359 if (!dev->gb) {
1360 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1361
1362 if (!dev->gb || !dev->gb_len) {
1363 dev->poll_dep = 0;
1364 queue_work(dev->wq, &dev->rf_work);
1365 }
1366 }
1367
1368 skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1369 skb_len += PASSIVE_DATA_LEN;
1370
1371 /* NFCID3 */
1372 skb_len += NFC_NFCID3_MAXSIZE;
1373 nfcid3[0] = 0x1;
1374 nfcid3[1] = 0xfe;
1375 get_random_bytes(nfcid3 + 2, 6);
1376
1377 skb = pn533_alloc_skb(dev, skb_len);
1378 if (!skb)
1379 return -ENOMEM;
1380
1381 *skb_put(skb, 1) = 0x01; /* Active */
1382 *skb_put(skb, 1) = 0x02; /* 424 kbps */
1383
1384 next = skb_put(skb, 1); /* Next */
1385 *next = 0;
1386
1387 /* Copy passive data */
1388 memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
1389 *next |= 1;
1390
1391 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1392 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
1393 NFC_NFCID3_MAXSIZE);
1394 *next |= 2;
1395
1396 memcpy(skb_put(skb, dev->gb_len), dev->gb, dev->gb_len);
1397 *next |= 4; /* We have some Gi */
1398
1399 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1400 pn533_poll_dep_complete, NULL);
1401
1402 if (rc < 0)
1403 dev_kfree_skb(skb);
1404
1405 return rc;
1406 }
1407
1408 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1409 struct sk_buff *resp)
1410 {
1411 struct pn533_poll_modulations *cur_mod;
1412 int rc;
1413
1414 dev_dbg(dev->dev, "%s\n", __func__);
1415
1416 if (IS_ERR(resp)) {
1417 rc = PTR_ERR(resp);
1418
1419 nfc_err(dev->dev, "%s Poll complete error %d\n",
1420 __func__, rc);
1421
1422 if (rc == -ENOENT) {
1423 if (dev->poll_mod_count != 0)
1424 return rc;
1425 goto stop_poll;
1426 } else if (rc < 0) {
1427 nfc_err(dev->dev,
1428 "Error %d when running poll\n", rc);
1429 goto stop_poll;
1430 }
1431 }
1432
1433 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1434
1435 if (cur_mod->len == 0) { /* Target mode */
1436 del_timer(&dev->listen_timer);
1437 rc = pn533_init_target_complete(dev, resp);
1438 goto done;
1439 }
1440
1441 /* Initiator mode */
1442 rc = pn533_start_poll_complete(dev, resp);
1443 if (!rc)
1444 goto done;
1445
1446 if (!dev->poll_mod_count) {
1447 dev_dbg(dev->dev, "Polling has been stopped\n");
1448 goto done;
1449 }
1450
1451 pn533_poll_next_mod(dev);
1452 /* Not target found, turn radio off */
1453 queue_work(dev->wq, &dev->rf_work);
1454
1455 done:
1456 dev_kfree_skb(resp);
1457 return rc;
1458
1459 stop_poll:
1460 nfc_err(dev->dev, "Polling operation has been stopped\n");
1461
1462 pn533_poll_reset_mod_list(dev);
1463 dev->poll_protocols = 0;
1464 return rc;
1465 }
1466
1467 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1468 struct pn533_poll_modulations *mod)
1469 {
1470 struct sk_buff *skb;
1471
1472 skb = pn533_alloc_skb(dev, mod->len);
1473 if (!skb)
1474 return NULL;
1475
1476 memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
1477
1478 return skb;
1479 }
1480
1481 static int pn533_send_poll_frame(struct pn533 *dev)
1482 {
1483 struct pn533_poll_modulations *mod;
1484 struct sk_buff *skb;
1485 int rc;
1486 u8 cmd_code;
1487
1488 mod = dev->poll_mod_active[dev->poll_mod_curr];
1489
1490 dev_dbg(dev->dev, "%s mod len %d\n",
1491 __func__, mod->len);
1492
1493 if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep) {
1494 dev->poll_dep = 0;
1495 return pn533_poll_dep(dev->nfc_dev);
1496 }
1497
1498 if (mod->len == 0) { /* Listen mode */
1499 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1500 skb = pn533_alloc_poll_tg_frame(dev);
1501 } else { /* Polling mode */
1502 cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET;
1503 skb = pn533_alloc_poll_in_frame(dev, mod);
1504 }
1505
1506 if (!skb) {
1507 nfc_err(dev->dev, "Failed to allocate skb\n");
1508 return -ENOMEM;
1509 }
1510
1511 rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1512 NULL);
1513 if (rc < 0) {
1514 dev_kfree_skb(skb);
1515 nfc_err(dev->dev, "Polling loop error %d\n", rc);
1516 }
1517
1518 return rc;
1519 }
1520
1521 static void pn533_wq_poll(struct work_struct *work)
1522 {
1523 struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1524 struct pn533_poll_modulations *cur_mod;
1525 int rc;
1526
1527 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1528
1529 dev_dbg(dev->dev,
1530 "%s cancel_listen %d modulation len %d\n",
1531 __func__, dev->cancel_listen, cur_mod->len);
1532
1533 if (dev->cancel_listen == 1) {
1534 dev->cancel_listen = 0;
1535 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC);
1536 }
1537
1538 rc = pn533_send_poll_frame(dev);
1539 if (rc)
1540 return;
1541
1542 if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1543 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1544 }
1545
1546 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1547 u32 im_protocols, u32 tm_protocols)
1548 {
1549 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1550 struct pn533_poll_modulations *cur_mod;
1551 u8 rand_mod;
1552 int rc;
1553
1554 dev_dbg(dev->dev,
1555 "%s: im protocols 0x%x tm protocols 0x%x\n",
1556 __func__, im_protocols, tm_protocols);
1557
1558 if (dev->tgt_active_prot) {
1559 nfc_err(dev->dev,
1560 "Cannot poll with a target already activated\n");
1561 return -EBUSY;
1562 }
1563
1564 if (dev->tgt_mode) {
1565 nfc_err(dev->dev,
1566 "Cannot poll while already being activated\n");
1567 return -EBUSY;
1568 }
1569
1570 if (tm_protocols) {
1571 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1572 if (dev->gb == NULL)
1573 tm_protocols = 0;
1574 }
1575
1576 pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1577 dev->poll_protocols = im_protocols;
1578 dev->listen_protocols = tm_protocols;
1579
1580 /* Do not always start polling from the same modulation */
1581 get_random_bytes(&rand_mod, sizeof(rand_mod));
1582 rand_mod %= dev->poll_mod_count;
1583 dev->poll_mod_curr = rand_mod;
1584
1585 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1586
1587 rc = pn533_send_poll_frame(dev);
1588
1589 /* Start listen timer */
1590 if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
1591 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1592
1593 return rc;
1594 }
1595
1596 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1597 {
1598 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1599
1600 del_timer(&dev->listen_timer);
1601
1602 if (!dev->poll_mod_count) {
1603 dev_dbg(dev->dev,
1604 "Polling operation was not running\n");
1605 return;
1606 }
1607
1608 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1609 flush_delayed_work(&dev->poll_work);
1610 pn533_poll_reset_mod_list(dev);
1611 }
1612
1613 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1614 {
1615 struct pn533_cmd_activate_response *rsp;
1616 u16 gt_len;
1617 int rc;
1618 struct sk_buff *skb;
1619 struct sk_buff *resp;
1620
1621 dev_dbg(dev->dev, "%s\n", __func__);
1622
1623 skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1624 if (!skb)
1625 return -ENOMEM;
1626
1627 *skb_put(skb, sizeof(u8)) = 1; /* TG */
1628 *skb_put(skb, sizeof(u8)) = 0; /* Next */
1629
1630 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1631 if (IS_ERR(resp))
1632 return PTR_ERR(resp);
1633
1634 rsp = (struct pn533_cmd_activate_response *)resp->data;
1635 rc = rsp->status & PN533_CMD_RET_MASK;
1636 if (rc != PN533_CMD_RET_SUCCESS) {
1637 nfc_err(dev->dev,
1638 "Target activation failed (error 0x%x)\n", rc);
1639 dev_kfree_skb(resp);
1640 return -EIO;
1641 }
1642
1643 /* ATR_RES general bytes are located at offset 16 */
1644 gt_len = resp->len - 16;
1645 rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1646
1647 dev_kfree_skb(resp);
1648 return rc;
1649 }
1650
1651 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1652 struct nfc_target *target, u32 protocol)
1653 {
1654 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1655 int rc;
1656
1657 dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol);
1658
1659 if (dev->poll_mod_count) {
1660 nfc_err(dev->dev,
1661 "Cannot activate while polling\n");
1662 return -EBUSY;
1663 }
1664
1665 if (dev->tgt_active_prot) {
1666 nfc_err(dev->dev,
1667 "There is already an active target\n");
1668 return -EBUSY;
1669 }
1670
1671 if (!dev->tgt_available_prots) {
1672 nfc_err(dev->dev,
1673 "There is no available target to activate\n");
1674 return -EINVAL;
1675 }
1676
1677 if (!(dev->tgt_available_prots & (1 << protocol))) {
1678 nfc_err(dev->dev,
1679 "Target doesn't support requested proto %u\n",
1680 protocol);
1681 return -EINVAL;
1682 }
1683
1684 if (protocol == NFC_PROTO_NFC_DEP) {
1685 rc = pn533_activate_target_nfcdep(dev);
1686 if (rc) {
1687 nfc_err(dev->dev,
1688 "Activating target with DEP failed %d\n", rc);
1689 return rc;
1690 }
1691 }
1692
1693 dev->tgt_active_prot = protocol;
1694 dev->tgt_available_prots = 0;
1695
1696 return 0;
1697 }
1698
1699 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg,
1700 struct sk_buff *resp)
1701 {
1702 int rc = 0;
1703
1704 dev_dbg(dev->dev, "%s\n", __func__);
1705
1706 if (IS_ERR(resp)) {
1707 rc = PTR_ERR(resp);
1708
1709 nfc_err(dev->dev, "Target release error %d\n", rc);
1710
1711 return rc;
1712 }
1713
1714 rc = resp->data[0] & PN533_CMD_RET_MASK;
1715 if (rc != PN533_CMD_RET_SUCCESS)
1716 nfc_err(dev->dev,
1717 "Error 0x%x when releasing the target\n", rc);
1718
1719 dev_kfree_skb(resp);
1720 return rc;
1721 }
1722
1723 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1724 struct nfc_target *target, u8 mode)
1725 {
1726 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1727 struct sk_buff *skb;
1728 int rc;
1729
1730 dev_dbg(dev->dev, "%s\n", __func__);
1731
1732 if (!dev->tgt_active_prot) {
1733 nfc_err(dev->dev, "There is no active target\n");
1734 return;
1735 }
1736
1737 dev->tgt_active_prot = 0;
1738 skb_queue_purge(&dev->resp_q);
1739
1740 skb = pn533_alloc_skb(dev, sizeof(u8));
1741 if (!skb)
1742 return;
1743
1744 *skb_put(skb, 1) = 1; /* TG*/
1745
1746 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb,
1747 pn533_deactivate_target_complete, NULL);
1748 if (rc < 0) {
1749 dev_kfree_skb(skb);
1750 nfc_err(dev->dev, "Target release error %d\n", rc);
1751 }
1752 }
1753
1754
1755 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1756 struct sk_buff *resp)
1757 {
1758 struct pn533_cmd_jump_dep_response *rsp;
1759 u8 target_gt_len;
1760 int rc;
1761 u8 active = *(u8 *)arg;
1762
1763 kfree(arg);
1764
1765 if (IS_ERR(resp))
1766 return PTR_ERR(resp);
1767
1768 if (dev->tgt_available_prots &&
1769 !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1770 nfc_err(dev->dev,
1771 "The target does not support DEP\n");
1772 rc = -EINVAL;
1773 goto error;
1774 }
1775
1776 rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1777
1778 rc = rsp->status & PN533_CMD_RET_MASK;
1779 if (rc != PN533_CMD_RET_SUCCESS) {
1780 nfc_err(dev->dev,
1781 "Bringing DEP link up failed (error 0x%x)\n", rc);
1782 goto error;
1783 }
1784
1785 if (!dev->tgt_available_prots) {
1786 struct nfc_target nfc_target;
1787
1788 dev_dbg(dev->dev, "Creating new target\n");
1789
1790 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1791 nfc_target.nfcid1_len = 10;
1792 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1793 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1794 if (rc)
1795 goto error;
1796
1797 dev->tgt_available_prots = 0;
1798 }
1799
1800 dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1801
1802 /* ATR_RES general bytes are located at offset 17 */
1803 target_gt_len = resp->len - 17;
1804 rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1805 rsp->gt, target_gt_len);
1806 if (rc == 0)
1807 rc = nfc_dep_link_is_up(dev->nfc_dev,
1808 dev->nfc_dev->targets[0].idx,
1809 !active, NFC_RF_INITIATOR);
1810
1811 error:
1812 dev_kfree_skb(resp);
1813 return rc;
1814 }
1815
1816 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
1817 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1818 u8 comm_mode, u8 *gb, size_t gb_len)
1819 {
1820 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1821 struct sk_buff *skb;
1822 int rc, skb_len;
1823 u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
1824 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1825
1826 dev_dbg(dev->dev, "%s\n", __func__);
1827
1828 if (dev->poll_mod_count) {
1829 nfc_err(dev->dev,
1830 "Cannot bring the DEP link up while polling\n");
1831 return -EBUSY;
1832 }
1833
1834 if (dev->tgt_active_prot) {
1835 nfc_err(dev->dev,
1836 "There is already an active target\n");
1837 return -EBUSY;
1838 }
1839
1840 skb_len = 3 + gb_len; /* ActPass + BR + Next */
1841 skb_len += PASSIVE_DATA_LEN;
1842
1843 /* NFCID3 */
1844 skb_len += NFC_NFCID3_MAXSIZE;
1845 if (target && !target->nfcid2_len) {
1846 nfcid3[0] = 0x1;
1847 nfcid3[1] = 0xfe;
1848 get_random_bytes(nfcid3 + 2, 6);
1849 }
1850
1851 skb = pn533_alloc_skb(dev, skb_len);
1852 if (!skb)
1853 return -ENOMEM;
1854
1855 *skb_put(skb, 1) = !comm_mode; /* ActPass */
1856 *skb_put(skb, 1) = 0x02; /* 424 kbps */
1857
1858 next = skb_put(skb, 1); /* Next */
1859 *next = 0;
1860
1861 /* Copy passive data */
1862 memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
1863 *next |= 1;
1864
1865 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1866 if (target && target->nfcid2_len)
1867 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
1868 target->nfcid2_len);
1869 else
1870 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
1871 NFC_NFCID3_MAXSIZE);
1872 *next |= 2;
1873
1874 if (gb != NULL && gb_len > 0) {
1875 memcpy(skb_put(skb, gb_len), gb, gb_len);
1876 *next |= 4; /* We have some Gi */
1877 } else {
1878 *next = 0;
1879 }
1880
1881 arg = kmalloc(sizeof(*arg), GFP_KERNEL);
1882 if (!arg) {
1883 dev_kfree_skb(skb);
1884 return -ENOMEM;
1885 }
1886
1887 *arg = !comm_mode;
1888
1889 pn533_rf_field(dev->nfc_dev, 0);
1890
1891 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1892 pn533_in_dep_link_up_complete, arg);
1893
1894 if (rc < 0) {
1895 dev_kfree_skb(skb);
1896 kfree(arg);
1897 }
1898
1899 return rc;
1900 }
1901
1902 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
1903 {
1904 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1905
1906 dev_dbg(dev->dev, "%s\n", __func__);
1907
1908 pn533_poll_reset_mod_list(dev);
1909
1910 if (dev->tgt_mode || dev->tgt_active_prot)
1911 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1912
1913 dev->tgt_active_prot = 0;
1914 dev->tgt_mode = 0;
1915
1916 skb_queue_purge(&dev->resp_q);
1917
1918 return 0;
1919 }
1920
1921 struct pn533_data_exchange_arg {
1922 data_exchange_cb_t cb;
1923 void *cb_context;
1924 };
1925
1926 static struct sk_buff *pn533_build_response(struct pn533 *dev)
1927 {
1928 struct sk_buff *skb, *tmp, *t;
1929 unsigned int skb_len = 0, tmp_len = 0;
1930
1931 dev_dbg(dev->dev, "%s\n", __func__);
1932
1933 if (skb_queue_empty(&dev->resp_q))
1934 return NULL;
1935
1936 if (skb_queue_len(&dev->resp_q) == 1) {
1937 skb = skb_dequeue(&dev->resp_q);
1938 goto out;
1939 }
1940
1941 skb_queue_walk_safe(&dev->resp_q, tmp, t)
1942 skb_len += tmp->len;
1943
1944 dev_dbg(dev->dev, "%s total length %d\n",
1945 __func__, skb_len);
1946
1947 skb = alloc_skb(skb_len, GFP_KERNEL);
1948 if (skb == NULL)
1949 goto out;
1950
1951 skb_put(skb, skb_len);
1952
1953 skb_queue_walk_safe(&dev->resp_q, tmp, t) {
1954 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
1955 tmp_len += tmp->len;
1956 }
1957
1958 out:
1959 skb_queue_purge(&dev->resp_q);
1960
1961 return skb;
1962 }
1963
1964 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
1965 struct sk_buff *resp)
1966 {
1967 struct pn533_data_exchange_arg *arg = _arg;
1968 struct sk_buff *skb;
1969 int rc = 0;
1970 u8 status, ret, mi;
1971
1972 dev_dbg(dev->dev, "%s\n", __func__);
1973
1974 if (IS_ERR(resp)) {
1975 rc = PTR_ERR(resp);
1976 goto _error;
1977 }
1978
1979 status = resp->data[0];
1980 ret = status & PN533_CMD_RET_MASK;
1981 mi = status & PN533_CMD_MI_MASK;
1982
1983 skb_pull(resp, sizeof(status));
1984
1985 if (ret != PN533_CMD_RET_SUCCESS) {
1986 nfc_err(dev->dev,
1987 "Exchanging data failed (error 0x%x)\n", ret);
1988 rc = -EIO;
1989 goto error;
1990 }
1991
1992 skb_queue_tail(&dev->resp_q, resp);
1993
1994 if (mi) {
1995 dev->cmd_complete_mi_arg = arg;
1996 queue_work(dev->wq, &dev->mi_rx_work);
1997 return -EINPROGRESS;
1998 }
1999
2000 /* Prepare for the next round */
2001 if (skb_queue_len(&dev->fragment_skb) > 0) {
2002 dev->cmd_complete_dep_arg = arg;
2003 queue_work(dev->wq, &dev->mi_tx_work);
2004
2005 return -EINPROGRESS;
2006 }
2007
2008 skb = pn533_build_response(dev);
2009 if (!skb) {
2010 rc = -ENOMEM;
2011 goto error;
2012 }
2013
2014 arg->cb(arg->cb_context, skb, 0);
2015 kfree(arg);
2016 return 0;
2017
2018 error:
2019 dev_kfree_skb(resp);
2020 _error:
2021 skb_queue_purge(&dev->resp_q);
2022 arg->cb(arg->cb_context, NULL, rc);
2023 kfree(arg);
2024 return rc;
2025 }
2026
2027 /*
2028 * Receive an incoming pn533 frame. skb contains only header and payload.
2029 * If skb == NULL, it is a notification that the link below is dead.
2030 */
2031 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2032 {
2033 if (!dev->cmd)
2034 goto sched_wq;
2035
2036 dev->cmd->status = status;
2037
2038 if (status != 0) {
2039 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2040 goto sched_wq;
2041 }
2042
2043 if (skb == NULL) {
2044 pr_err("NULL Frame -> link is dead\n");
2045 goto sched_wq;
2046 }
2047
2048 if (pn533_rx_frame_is_ack(skb->data)) {
2049 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2050 dev_kfree_skb(skb);
2051 return;
2052 }
2053
2054 print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2055 dev->ops->rx_frame_size(skb->data), false);
2056
2057 if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2058 nfc_err(dev->dev, "Received an invalid frame\n");
2059 dev->cmd->status = -EIO;
2060 } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2061 nfc_err(dev->dev, "It it not the response to the last command\n");
2062 dev->cmd->status = -EIO;
2063 }
2064
2065 dev->cmd->resp = skb;
2066
2067 sched_wq:
2068 queue_work(dev->wq, &dev->cmd_complete_work);
2069 }
2070 EXPORT_SYMBOL(pn533_recv_frame);
2071
2072 /* Split the Tx skb into small chunks */
2073 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2074 {
2075 struct sk_buff *frag;
2076 int frag_size;
2077
2078 do {
2079 /* Remaining size */
2080 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2081 frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2082 else
2083 frag_size = skb->len;
2084
2085 /* Allocate and reserve */
2086 frag = pn533_alloc_skb(dev, frag_size);
2087 if (!frag) {
2088 skb_queue_purge(&dev->fragment_skb);
2089 break;
2090 }
2091
2092 if (!dev->tgt_mode) {
2093 /* Reserve the TG/MI byte */
2094 skb_reserve(frag, 1);
2095
2096 /* MI + TG */
2097 if (frag_size == PN533_CMD_DATAFRAME_MAXLEN)
2098 *skb_push(frag, sizeof(u8)) =
2099 (PN533_CMD_MI_MASK | 1);
2100 else
2101 *skb_push(frag, sizeof(u8)) = 1; /* TG */
2102 }
2103
2104 memcpy(skb_put(frag, frag_size), skb->data, frag_size);
2105
2106 /* Reduce the size of incoming buffer */
2107 skb_pull(skb, frag_size);
2108
2109 /* Add this to skb_queue */
2110 skb_queue_tail(&dev->fragment_skb, frag);
2111
2112 } while (skb->len > 0);
2113
2114 dev_kfree_skb(skb);
2115
2116 return skb_queue_len(&dev->fragment_skb);
2117 }
2118
2119 static int pn533_transceive(struct nfc_dev *nfc_dev,
2120 struct nfc_target *target, struct sk_buff *skb,
2121 data_exchange_cb_t cb, void *cb_context)
2122 {
2123 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2124 struct pn533_data_exchange_arg *arg = NULL;
2125 int rc;
2126
2127 dev_dbg(dev->dev, "%s\n", __func__);
2128
2129 if (!dev->tgt_active_prot) {
2130 nfc_err(dev->dev,
2131 "Can't exchange data if there is no active target\n");
2132 rc = -EINVAL;
2133 goto error;
2134 }
2135
2136 arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2137 if (!arg) {
2138 rc = -ENOMEM;
2139 goto error;
2140 }
2141
2142 arg->cb = cb;
2143 arg->cb_context = cb_context;
2144
2145 switch (dev->device_type) {
2146 case PN533_DEVICE_PASORI:
2147 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2148 rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2149 skb,
2150 pn533_data_exchange_complete,
2151 arg);
2152
2153 break;
2154 }
2155 default:
2156 /* jumbo frame ? */
2157 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2158 rc = pn533_fill_fragment_skbs(dev, skb);
2159 if (rc <= 0)
2160 goto error;
2161
2162 skb = skb_dequeue(&dev->fragment_skb);
2163 if (!skb) {
2164 rc = -EIO;
2165 goto error;
2166 }
2167 } else {
2168 *skb_push(skb, sizeof(u8)) = 1; /* TG */
2169 }
2170
2171 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2172 skb, pn533_data_exchange_complete,
2173 arg);
2174
2175 break;
2176 }
2177
2178 if (rc < 0) /* rc from send_async */
2179 goto error;
2180
2181 return 0;
2182
2183 error:
2184 kfree(arg);
2185 dev_kfree_skb(skb);
2186 return rc;
2187 }
2188
2189 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2190 struct sk_buff *resp)
2191 {
2192 u8 status;
2193
2194 dev_dbg(dev->dev, "%s\n", __func__);
2195
2196 if (IS_ERR(resp))
2197 return PTR_ERR(resp);
2198
2199 status = resp->data[0];
2200
2201 /* Prepare for the next round */
2202 if (skb_queue_len(&dev->fragment_skb) > 0) {
2203 queue_work(dev->wq, &dev->mi_tm_tx_work);
2204 return -EINPROGRESS;
2205 }
2206 dev_kfree_skb(resp);
2207
2208 if (status != 0) {
2209 nfc_tm_deactivated(dev->nfc_dev);
2210
2211 dev->tgt_mode = 0;
2212
2213 return 0;
2214 }
2215
2216 queue_work(dev->wq, &dev->tg_work);
2217
2218 return 0;
2219 }
2220
2221 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2222 {
2223 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2224 int rc;
2225
2226 dev_dbg(dev->dev, "%s\n", __func__);
2227
2228 /* let's split in multiple chunks if size's too big */
2229 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2230 rc = pn533_fill_fragment_skbs(dev, skb);
2231 if (rc <= 0)
2232 goto error;
2233
2234 /* get the first skb */
2235 skb = skb_dequeue(&dev->fragment_skb);
2236 if (!skb) {
2237 rc = -EIO;
2238 goto error;
2239 }
2240
2241 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2242 pn533_tm_send_complete, NULL);
2243 } else {
2244 /* Send th skb */
2245 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2246 pn533_tm_send_complete, NULL);
2247 }
2248
2249 error:
2250 if (rc < 0) {
2251 dev_kfree_skb(skb);
2252 skb_queue_purge(&dev->fragment_skb);
2253 }
2254
2255 return rc;
2256 }
2257
2258 static void pn533_wq_mi_recv(struct work_struct *work)
2259 {
2260 struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2261 struct sk_buff *skb;
2262 int rc;
2263
2264 dev_dbg(dev->dev, "%s\n", __func__);
2265
2266 skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2267 if (!skb)
2268 goto error;
2269
2270 switch (dev->device_type) {
2271 case PN533_DEVICE_PASORI:
2272 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2273 rc = pn533_send_cmd_direct_async(dev,
2274 PN533_CMD_IN_COMM_THRU,
2275 skb,
2276 pn533_data_exchange_complete,
2277 dev->cmd_complete_mi_arg);
2278
2279 break;
2280 }
2281 default:
2282 *skb_put(skb, sizeof(u8)) = 1; /*TG*/
2283
2284 rc = pn533_send_cmd_direct_async(dev,
2285 PN533_CMD_IN_DATA_EXCHANGE,
2286 skb,
2287 pn533_data_exchange_complete,
2288 dev->cmd_complete_mi_arg);
2289
2290 break;
2291 }
2292
2293 if (rc == 0) /* success */
2294 return;
2295
2296 nfc_err(dev->dev,
2297 "Error %d when trying to perform data_exchange\n", rc);
2298
2299 dev_kfree_skb(skb);
2300 kfree(dev->cmd_complete_mi_arg);
2301
2302 error:
2303 dev->phy_ops->send_ack(dev, GFP_KERNEL);
2304 queue_work(dev->wq, &dev->cmd_work);
2305 }
2306
2307 static void pn533_wq_mi_send(struct work_struct *work)
2308 {
2309 struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2310 struct sk_buff *skb;
2311 int rc;
2312
2313 dev_dbg(dev->dev, "%s\n", __func__);
2314
2315 /* Grab the first skb in the queue */
2316 skb = skb_dequeue(&dev->fragment_skb);
2317
2318 if (skb == NULL) { /* No more data */
2319 /* Reset the queue for future use */
2320 skb_queue_head_init(&dev->fragment_skb);
2321 goto error;
2322 }
2323
2324 switch (dev->device_type) {
2325 case PN533_DEVICE_PASORI:
2326 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2327 rc = -EIO;
2328 break;
2329 }
2330
2331 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2332 skb,
2333 pn533_data_exchange_complete,
2334 dev->cmd_complete_dep_arg);
2335
2336 break;
2337
2338 default:
2339 /* Still some fragments? */
2340 rc = pn533_send_cmd_direct_async(dev,
2341 PN533_CMD_IN_DATA_EXCHANGE,
2342 skb,
2343 pn533_data_exchange_complete,
2344 dev->cmd_complete_dep_arg);
2345
2346 break;
2347 }
2348
2349 if (rc == 0) /* success */
2350 return;
2351
2352 nfc_err(dev->dev,
2353 "Error %d when trying to perform data_exchange\n", rc);
2354
2355 dev_kfree_skb(skb);
2356 kfree(dev->cmd_complete_dep_arg);
2357
2358 error:
2359 dev->phy_ops->send_ack(dev, GFP_KERNEL);
2360 queue_work(dev->wq, &dev->cmd_work);
2361 }
2362
2363 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2364 u8 cfgdata_len)
2365 {
2366 struct sk_buff *skb;
2367 struct sk_buff *resp;
2368 int skb_len;
2369
2370 dev_dbg(dev->dev, "%s\n", __func__);
2371
2372 skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2373
2374 skb = pn533_alloc_skb(dev, skb_len);
2375 if (!skb)
2376 return -ENOMEM;
2377
2378 *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2379 memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2380
2381 resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2382 if (IS_ERR(resp))
2383 return PTR_ERR(resp);
2384
2385 dev_kfree_skb(resp);
2386 return 0;
2387 }
2388
2389 static int pn533_get_firmware_version(struct pn533 *dev,
2390 struct pn533_fw_version *fv)
2391 {
2392 struct sk_buff *skb;
2393 struct sk_buff *resp;
2394
2395 skb = pn533_alloc_skb(dev, 0);
2396 if (!skb)
2397 return -ENOMEM;
2398
2399 resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2400 if (IS_ERR(resp))
2401 return PTR_ERR(resp);
2402
2403 fv->ic = resp->data[0];
2404 fv->ver = resp->data[1];
2405 fv->rev = resp->data[2];
2406 fv->support = resp->data[3];
2407
2408 dev_kfree_skb(resp);
2409 return 0;
2410 }
2411
2412 static int pn533_pasori_fw_reset(struct pn533 *dev)
2413 {
2414 struct sk_buff *skb;
2415 struct sk_buff *resp;
2416
2417 dev_dbg(dev->dev, "%s\n", __func__);
2418
2419 skb = pn533_alloc_skb(dev, sizeof(u8));
2420 if (!skb)
2421 return -ENOMEM;
2422
2423 *skb_put(skb, sizeof(u8)) = 0x1;
2424
2425 resp = pn533_send_cmd_sync(dev, 0x18, skb);
2426 if (IS_ERR(resp))
2427 return PTR_ERR(resp);
2428
2429 dev_kfree_skb(resp);
2430
2431 return 0;
2432 }
2433
2434 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2435 {
2436 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2437 u8 rf_field = !!rf;
2438 int rc;
2439
2440 rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2441
2442 rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2443 (u8 *)&rf_field, 1);
2444 if (rc) {
2445 nfc_err(dev->dev, "Error on setting RF field\n");
2446 return rc;
2447 }
2448
2449 return rc;
2450 }
2451
2452 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2453 {
2454 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2455 struct sk_buff *skb;
2456 struct sk_buff *resp;
2457
2458 skb = pn533_alloc_skb(dev, 1);
2459 if (!skb)
2460 return -ENOMEM;
2461
2462 *skb_put(skb, 1) = 0x01;
2463
2464 resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2465 if (IS_ERR(resp))
2466 return PTR_ERR(resp);
2467
2468 dev_kfree_skb(resp);
2469 return 0;
2470 }
2471
2472 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2473 {
2474 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2475
2476 if (dev->device_type == PN533_DEVICE_PN532) {
2477 int rc = pn532_sam_configuration(nfc_dev);
2478
2479 if (rc)
2480 return rc;
2481 }
2482
2483 return pn533_rf_field(nfc_dev, 1);
2484 }
2485
2486 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2487 {
2488 return pn533_rf_field(nfc_dev, 0);
2489 }
2490
2491 static struct nfc_ops pn533_nfc_ops = {
2492 .dev_up = pn533_dev_up,
2493 .dev_down = pn533_dev_down,
2494 .dep_link_up = pn533_dep_link_up,
2495 .dep_link_down = pn533_dep_link_down,
2496 .start_poll = pn533_start_poll,
2497 .stop_poll = pn533_stop_poll,
2498 .activate_target = pn533_activate_target,
2499 .deactivate_target = pn533_deactivate_target,
2500 .im_transceive = pn533_transceive,
2501 .tm_send = pn533_tm_send,
2502 };
2503
2504 static int pn533_setup(struct pn533 *dev)
2505 {
2506 struct pn533_config_max_retries max_retries;
2507 struct pn533_config_timing timing;
2508 u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2509 int rc;
2510
2511 switch (dev->device_type) {
2512 case PN533_DEVICE_STD:
2513 case PN533_DEVICE_PASORI:
2514 case PN533_DEVICE_ACR122U:
2515 case PN533_DEVICE_PN532:
2516 max_retries.mx_rty_atr = 0x2;
2517 max_retries.mx_rty_psl = 0x1;
2518 max_retries.mx_rty_passive_act =
2519 PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2520
2521 timing.rfu = PN533_CONFIG_TIMING_102;
2522 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2523 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2524
2525 break;
2526
2527 default:
2528 nfc_err(dev->dev, "Unknown device type %d\n",
2529 dev->device_type);
2530 return -EINVAL;
2531 }
2532
2533 rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2534 (u8 *)&max_retries, sizeof(max_retries));
2535 if (rc) {
2536 nfc_err(dev->dev,
2537 "Error on setting MAX_RETRIES config\n");
2538 return rc;
2539 }
2540
2541
2542 rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2543 (u8 *)&timing, sizeof(timing));
2544 if (rc) {
2545 nfc_err(dev->dev, "Error on setting RF timings\n");
2546 return rc;
2547 }
2548
2549 switch (dev->device_type) {
2550 case PN533_DEVICE_STD:
2551 case PN533_DEVICE_PN532:
2552 break;
2553
2554 case PN533_DEVICE_PASORI:
2555 pn533_pasori_fw_reset(dev);
2556
2557 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2558 pasori_cfg, 3);
2559 if (rc) {
2560 nfc_err(dev->dev,
2561 "Error while settings PASORI config\n");
2562 return rc;
2563 }
2564
2565 pn533_pasori_fw_reset(dev);
2566
2567 break;
2568 }
2569
2570 return 0;
2571 }
2572
2573 int pn533_finalize_setup(struct pn533 *dev)
2574 {
2575
2576 struct pn533_fw_version fw_ver;
2577 int rc;
2578
2579 memset(&fw_ver, 0, sizeof(fw_ver));
2580
2581 rc = pn533_get_firmware_version(dev, &fw_ver);
2582 if (rc) {
2583 nfc_err(dev->dev, "Unable to get FW version\n");
2584 return rc;
2585 }
2586
2587 nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2588 fw_ver.ic, fw_ver.ver, fw_ver.rev);
2589
2590 rc = pn533_setup(dev);
2591 if (rc)
2592 return rc;
2593
2594 return 0;
2595 }
2596 EXPORT_SYMBOL_GPL(pn533_finalize_setup);
2597
2598 struct pn533 *pn533_register_device(u32 device_type,
2599 u32 protocols,
2600 enum pn533_protocol_type protocol_type,
2601 void *phy,
2602 struct pn533_phy_ops *phy_ops,
2603 struct pn533_frame_ops *fops,
2604 struct device *dev,
2605 struct device *parent)
2606 {
2607 struct pn533 *priv;
2608 int rc = -ENOMEM;
2609
2610 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2611 if (!priv)
2612 return ERR_PTR(-ENOMEM);
2613
2614 priv->phy = phy;
2615 priv->phy_ops = phy_ops;
2616 priv->dev = dev;
2617 if (fops != NULL)
2618 priv->ops = fops;
2619 else
2620 priv->ops = &pn533_std_frame_ops;
2621
2622 priv->protocol_type = protocol_type;
2623 priv->device_type = device_type;
2624
2625 mutex_init(&priv->cmd_lock);
2626
2627 INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2628 INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2629 INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2630 INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2631 INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2632 INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2633 INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2634 INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2635 INIT_WORK(&priv->rf_work, pn533_wq_rf);
2636 priv->wq = alloc_ordered_workqueue("pn533", 0);
2637 if (priv->wq == NULL)
2638 goto error;
2639
2640 init_timer(&priv->listen_timer);
2641 priv->listen_timer.data = (unsigned long) priv;
2642 priv->listen_timer.function = pn533_listen_mode_timer;
2643
2644 skb_queue_head_init(&priv->resp_q);
2645 skb_queue_head_init(&priv->fragment_skb);
2646
2647 INIT_LIST_HEAD(&priv->cmd_queue);
2648
2649 priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2650 priv->ops->tx_header_len +
2651 PN533_CMD_DATAEXCH_HEAD_LEN,
2652 priv->ops->tx_tail_len);
2653 if (!priv->nfc_dev) {
2654 rc = -ENOMEM;
2655 goto destroy_wq;
2656 }
2657
2658 nfc_set_parent_dev(priv->nfc_dev, parent);
2659 nfc_set_drvdata(priv->nfc_dev, priv);
2660
2661 rc = nfc_register_device(priv->nfc_dev);
2662 if (rc)
2663 goto free_nfc_dev;
2664
2665 return priv;
2666
2667 free_nfc_dev:
2668 nfc_free_device(priv->nfc_dev);
2669
2670 destroy_wq:
2671 destroy_workqueue(priv->wq);
2672 error:
2673 kfree(priv);
2674 return ERR_PTR(rc);
2675 }
2676 EXPORT_SYMBOL_GPL(pn533_register_device);
2677
2678 void pn533_unregister_device(struct pn533 *priv)
2679 {
2680 struct pn533_cmd *cmd, *n;
2681
2682 nfc_unregister_device(priv->nfc_dev);
2683 nfc_free_device(priv->nfc_dev);
2684
2685 flush_delayed_work(&priv->poll_work);
2686 destroy_workqueue(priv->wq);
2687
2688 skb_queue_purge(&priv->resp_q);
2689
2690 del_timer(&priv->listen_timer);
2691
2692 list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2693 list_del(&cmd->queue);
2694 kfree(cmd);
2695 }
2696
2697 kfree(priv);
2698 }
2699 EXPORT_SYMBOL_GPL(pn533_unregister_device);
2700
2701
2702 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
2703 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2704 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
2705 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2706 MODULE_VERSION(VERSION);
2707 MODULE_LICENSE("GPL");
Ubuntu Artful kernel mirror