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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[cris-mirror.git] / drivers / nfc / pn533 / pn533.c
blobd9c55830b2b26a1fb67b41562b3b16c0b09f8830
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 int status = cmd->status;
387
388 struct sk_buff *req = cmd->req;
389 struct sk_buff *resp = cmd->resp;
390
391 int rc;
392
393 dev_kfree_skb(req);
394
395 if (status < 0) {
396 rc = cmd->complete_cb(dev, cmd->complete_cb_context,
397 ERR_PTR(status));
398 dev_kfree_skb(resp);
399 goto done;
400 }
401
402 skb_pull(resp, dev->ops->rx_header_len);
403 skb_trim(resp, resp->len - dev->ops->rx_tail_len);
404
405 rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp);
406
407 done:
408 kfree(cmd);
409 dev->cmd = NULL;
410 return rc;
411 }
412
413 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
414 struct sk_buff *req,
415 pn533_send_async_complete_t complete_cb,
416 void *complete_cb_context)
417 {
418 struct pn533_cmd *cmd;
419 int rc = 0;
420
421 dev_dbg(dev->dev, "Sending command 0x%x\n", cmd_code);
422
423 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
424 if (!cmd)
425 return -ENOMEM;
426
427 cmd->code = cmd_code;
428 cmd->req = req;
429 cmd->complete_cb = complete_cb;
430 cmd->complete_cb_context = complete_cb_context;
431
432 pn533_build_cmd_frame(dev, cmd_code, req);
433
434 mutex_lock(&dev->cmd_lock);
435
436 if (!dev->cmd_pending) {
437 rc = dev->phy_ops->send_frame(dev, req);
438 if (rc)
439 goto error;
440
441 dev->cmd_pending = 1;
442 dev->cmd = cmd;
443 goto unlock;
444 }
445
446 dev_dbg(dev->dev, "%s Queueing command 0x%x\n",
447 __func__, cmd_code);
448
449 INIT_LIST_HEAD(&cmd->queue);
450 list_add_tail(&cmd->queue, &dev->cmd_queue);
451
452 goto unlock;
453
454 error:
455 kfree(cmd);
456 unlock:
457 mutex_unlock(&dev->cmd_lock);
458 return rc;
459 }
460
461 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
462 struct sk_buff *req,
463 pn533_send_async_complete_t complete_cb,
464 void *complete_cb_context)
465 {
466 int rc;
467
468 rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
469 complete_cb_context);
470
471 return rc;
472 }
473
474 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
475 struct sk_buff *req,
476 pn533_send_async_complete_t complete_cb,
477 void *complete_cb_context)
478 {
479 int rc;
480
481 rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
482 complete_cb_context);
483
484 return rc;
485 }
486
487 /*
488 * pn533_send_cmd_direct_async
489 *
490 * The function sends a piority cmd directly to the chip omiting the cmd
491 * queue. It's intended to be used by chaining mechanism of received responses
492 * where the host has to request every single chunk of data before scheduling
493 * next cmd from the queue.
494 */
495 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
496 struct sk_buff *req,
497 pn533_send_async_complete_t complete_cb,
498 void *complete_cb_context)
499 {
500 struct pn533_cmd *cmd;
501 int rc;
502
503 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
504 if (!cmd)
505 return -ENOMEM;
506
507 cmd->code = cmd_code;
508 cmd->req = req;
509 cmd->complete_cb = complete_cb;
510 cmd->complete_cb_context = complete_cb_context;
511
512 pn533_build_cmd_frame(dev, cmd_code, req);
513
514 rc = dev->phy_ops->send_frame(dev, req);
515 if (rc < 0)
516 kfree(cmd);
517 else
518 dev->cmd = cmd;
519
520 return rc;
521 }
522
523 static void pn533_wq_cmd_complete(struct work_struct *work)
524 {
525 struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
526 int rc;
527
528 rc = pn533_send_async_complete(dev);
529 if (rc != -EINPROGRESS)
530 queue_work(dev->wq, &dev->cmd_work);
531 }
532
533 static void pn533_wq_cmd(struct work_struct *work)
534 {
535 struct pn533 *dev = container_of(work, struct pn533, cmd_work);
536 struct pn533_cmd *cmd;
537 int rc;
538
539 mutex_lock(&dev->cmd_lock);
540
541 if (list_empty(&dev->cmd_queue)) {
542 dev->cmd_pending = 0;
543 mutex_unlock(&dev->cmd_lock);
544 return;
545 }
546
547 cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
548
549 list_del(&cmd->queue);
550
551 mutex_unlock(&dev->cmd_lock);
552
553 rc = dev->phy_ops->send_frame(dev, cmd->req);
554 if (rc < 0) {
555 dev_kfree_skb(cmd->req);
556 kfree(cmd);
557 return;
558 }
559
560 dev->cmd = cmd;
561 }
562
563 struct pn533_sync_cmd_response {
564 struct sk_buff *resp;
565 struct completion done;
566 };
567
568 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
569 struct sk_buff *resp)
570 {
571 struct pn533_sync_cmd_response *arg = _arg;
572
573 arg->resp = resp;
574 complete(&arg->done);
575
576 return 0;
577 }
578
579 /* pn533_send_cmd_sync
580 *
581 * Please note the req parameter is freed inside the function to
582 * limit a number of return value interpretations by the caller.
583 *
584 * 1. negative in case of error during TX path -> req should be freed
585 *
586 * 2. negative in case of error during RX path -> req should not be freed
587 * as it's been already freed at the beginning of RX path by
588 * async_complete_cb.
589 *
590 * 3. valid pointer in case of succesfult RX path
591 *
592 * A caller has to check a return value with IS_ERR macro. If the test pass,
593 * the returned pointer is valid.
594 *
595 */
596 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
597 struct sk_buff *req)
598 {
599 int rc;
600 struct pn533_sync_cmd_response arg;
601
602 init_completion(&arg.done);
603
604 rc = pn533_send_cmd_async(dev, cmd_code, req,
605 pn533_send_sync_complete, &arg);
606 if (rc) {
607 dev_kfree_skb(req);
608 return ERR_PTR(rc);
609 }
610
611 wait_for_completion(&arg.done);
612
613 return arg.resp;
614 }
615
616 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
617 {
618 struct sk_buff *skb;
619
620 skb = alloc_skb(dev->ops->tx_header_len +
621 size +
622 dev->ops->tx_tail_len, GFP_KERNEL);
623
624 if (skb)
625 skb_reserve(skb, dev->ops->tx_header_len);
626
627 return skb;
628 }
629
630 struct pn533_target_type_a {
631 __be16 sens_res;
632 u8 sel_res;
633 u8 nfcid_len;
634 u8 nfcid_data[];
635 } __packed;
636
637
638 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
639 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
640 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
641
642 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
643 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
644
645 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
646 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
647
648 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
649 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
650 #define PN533_TYPE_A_SEL_PROT_DEP 2
651 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
652
653 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
654 int target_data_len)
655 {
656 u8 ssd;
657 u8 platconf;
658
659 if (target_data_len < sizeof(struct pn533_target_type_a))
660 return false;
661
662 /*
663 * The length check of nfcid[] and ats[] are not being performed because
664 * the values are not being used
665 */
666
667 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
668 ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
669 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
670
671 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
672 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
673 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
674 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
675 return false;
676
677 /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
678 if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
679 return false;
680
681 return true;
682 }
683
684 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
685 int tgt_data_len)
686 {
687 struct pn533_target_type_a *tgt_type_a;
688
689 tgt_type_a = (struct pn533_target_type_a *)tgt_data;
690
691 if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
692 return -EPROTO;
693
694 switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
695 case PN533_TYPE_A_SEL_PROT_MIFARE:
696 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
697 break;
698 case PN533_TYPE_A_SEL_PROT_ISO14443:
699 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
700 break;
701 case PN533_TYPE_A_SEL_PROT_DEP:
702 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
703 break;
704 case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
705 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
706 NFC_PROTO_NFC_DEP_MASK;
707 break;
708 }
709
710 nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
711 nfc_tgt->sel_res = tgt_type_a->sel_res;
712 nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
713 memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
714
715 return 0;
716 }
717
718 struct pn533_target_felica {
719 u8 pol_res;
720 u8 opcode;
721 u8 nfcid2[NFC_NFCID2_MAXSIZE];
722 u8 pad[8];
723 /* optional */
724 u8 syst_code[];
725 } __packed;
726
727 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
728 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
729
730 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
731 int target_data_len)
732 {
733 if (target_data_len < sizeof(struct pn533_target_felica))
734 return false;
735
736 if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
737 return false;
738
739 return true;
740 }
741
742 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
743 int tgt_data_len)
744 {
745 struct pn533_target_felica *tgt_felica;
746
747 tgt_felica = (struct pn533_target_felica *)tgt_data;
748
749 if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
750 return -EPROTO;
751
752 if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
753 (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
754 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
755 else
756 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
757
758 memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
759 nfc_tgt->sensf_res_len = 9;
760
761 memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
762 nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
763
764 return 0;
765 }
766
767 struct pn533_target_jewel {
768 __be16 sens_res;
769 u8 jewelid[4];
770 } __packed;
771
772 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
773 int target_data_len)
774 {
775 u8 ssd;
776 u8 platconf;
777
778 if (target_data_len < sizeof(struct pn533_target_jewel))
779 return false;
780
781 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
782 ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
783 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
784
785 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
786 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
787 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
788 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
789 return false;
790
791 return true;
792 }
793
794 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
795 int tgt_data_len)
796 {
797 struct pn533_target_jewel *tgt_jewel;
798
799 tgt_jewel = (struct pn533_target_jewel *)tgt_data;
800
801 if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
802 return -EPROTO;
803
804 nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
805 nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
806 nfc_tgt->nfcid1_len = 4;
807 memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
808
809 return 0;
810 }
811
812 struct pn533_type_b_prot_info {
813 u8 bitrate;
814 u8 fsci_type;
815 u8 fwi_adc_fo;
816 } __packed;
817
818 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
819 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
820 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
821
822 struct pn533_type_b_sens_res {
823 u8 opcode;
824 u8 nfcid[4];
825 u8 appdata[4];
826 struct pn533_type_b_prot_info prot_info;
827 } __packed;
828
829 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
830
831 struct pn533_target_type_b {
832 struct pn533_type_b_sens_res sensb_res;
833 u8 attrib_res_len;
834 u8 attrib_res[];
835 } __packed;
836
837 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
838 int target_data_len)
839 {
840 if (target_data_len < sizeof(struct pn533_target_type_b))
841 return false;
842
843 if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
844 return false;
845
846 if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
847 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
848 return false;
849
850 return true;
851 }
852
853 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
854 int tgt_data_len)
855 {
856 struct pn533_target_type_b *tgt_type_b;
857
858 tgt_type_b = (struct pn533_target_type_b *)tgt_data;
859
860 if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
861 return -EPROTO;
862
863 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
864
865 return 0;
866 }
867
868 static void pn533_poll_reset_mod_list(struct pn533 *dev);
869 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
870 int tgdata_len)
871 {
872 struct nfc_target nfc_tgt;
873 int rc;
874
875 dev_dbg(dev->dev, "%s: modulation=%d\n",
876 __func__, dev->poll_mod_curr);
877
878 if (tg != 1)
879 return -EPROTO;
880
881 memset(&nfc_tgt, 0, sizeof(struct nfc_target));
882
883 switch (dev->poll_mod_curr) {
884 case PN533_POLL_MOD_106KBPS_A:
885 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
886 break;
887 case PN533_POLL_MOD_212KBPS_FELICA:
888 case PN533_POLL_MOD_424KBPS_FELICA:
889 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
890 break;
891 case PN533_POLL_MOD_106KBPS_JEWEL:
892 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
893 break;
894 case PN533_POLL_MOD_847KBPS_B:
895 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
896 break;
897 default:
898 nfc_err(dev->dev,
899 "Unknown current poll modulation\n");
900 return -EPROTO;
901 }
902
903 if (rc)
904 return rc;
905
906 if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
907 dev_dbg(dev->dev,
908 "The Tg found doesn't have the desired protocol\n");
909 return -EAGAIN;
910 }
911
912 dev_dbg(dev->dev,
913 "Target found - supported protocols: 0x%x\n",
914 nfc_tgt.supported_protocols);
915
916 dev->tgt_available_prots = nfc_tgt.supported_protocols;
917
918 pn533_poll_reset_mod_list(dev);
919 nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
920
921 return 0;
922 }
923
924 static inline void pn533_poll_next_mod(struct pn533 *dev)
925 {
926 dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
927 }
928
929 static void pn533_poll_reset_mod_list(struct pn533 *dev)
930 {
931 dev->poll_mod_count = 0;
932 }
933
934 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
935 {
936 dev->poll_mod_active[dev->poll_mod_count] =
937 (struct pn533_poll_modulations *)&poll_mod[mod_index];
938 dev->poll_mod_count++;
939 }
940
941 static void pn533_poll_create_mod_list(struct pn533 *dev,
942 u32 im_protocols, u32 tm_protocols)
943 {
944 pn533_poll_reset_mod_list(dev);
945
946 if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
947 (im_protocols & NFC_PROTO_ISO14443_MASK) ||
948 (im_protocols & NFC_PROTO_NFC_DEP_MASK))
949 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
950
951 if (im_protocols & NFC_PROTO_FELICA_MASK ||
952 im_protocols & NFC_PROTO_NFC_DEP_MASK) {
953 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
954 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
955 }
956
957 if (im_protocols & NFC_PROTO_JEWEL_MASK)
958 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
959
960 if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
961 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
962
963 if (tm_protocols)
964 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
965 }
966
967 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
968 {
969 u8 nbtg, tg, *tgdata;
970 int rc, tgdata_len;
971
972 /* Toggle the DEP polling */
973 if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK)
974 dev->poll_dep = 1;
975
976 nbtg = resp->data[0];
977 tg = resp->data[1];
978 tgdata = &resp->data[2];
979 tgdata_len = resp->len - 2; /* nbtg + tg */
980
981 if (nbtg) {
982 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
983
984 /* We must stop the poll after a valid target found */
985 if (rc == 0)
986 return 0;
987 }
988
989 return -EAGAIN;
990 }
991
992 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
993 {
994 struct sk_buff *skb;
995 u8 *felica, *nfcid3, *gb;
996
997 u8 *gbytes = dev->gb;
998 size_t gbytes_len = dev->gb_len;
999
1000 u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1001 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1002 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1003 0xff, 0xff}; /* System code */
1004
1005 u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1006 0x0, 0x0, 0x0,
1007 0x40}; /* SEL_RES for DEP */
1008
1009 unsigned int skb_len = 36 + /*
1010 * mode (1), mifare (6),
1011 * felica (18), nfcid3 (10), gb_len (1)
1012 */
1013 gbytes_len +
1014 1; /* len Tk*/
1015
1016 skb = pn533_alloc_skb(dev, skb_len);
1017 if (!skb)
1018 return NULL;
1019
1020 /* DEP support only */
1021 *skb_put(skb, 1) = PN533_INIT_TARGET_DEP;
1022
1023 /* MIFARE params */
1024 memcpy(skb_put(skb, 6), mifare_params, 6);
1025
1026 /* Felica params */
1027 felica = skb_put(skb, 18);
1028 memcpy(felica, felica_params, 18);
1029 get_random_bytes(felica + 2, 6);
1030
1031 /* NFCID3 */
1032 nfcid3 = skb_put(skb, 10);
1033 memset(nfcid3, 0, 10);
1034 memcpy(nfcid3, felica, 8);
1035
1036 /* General bytes */
1037 *skb_put(skb, 1) = gbytes_len;
1038
1039 gb = skb_put(skb, gbytes_len);
1040 memcpy(gb, gbytes, gbytes_len);
1041
1042 /* Len Tk */
1043 *skb_put(skb, 1) = 0;
1044
1045 return skb;
1046 }
1047
1048 static void pn533_wq_tm_mi_recv(struct work_struct *work);
1049 static struct sk_buff *pn533_build_response(struct pn533 *dev);
1050
1051 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1052 struct sk_buff *resp)
1053 {
1054 struct sk_buff *skb;
1055 u8 status, ret, mi;
1056 int rc;
1057
1058 dev_dbg(dev->dev, "%s\n", __func__);
1059
1060 if (IS_ERR(resp)) {
1061 skb_queue_purge(&dev->resp_q);
1062 return PTR_ERR(resp);
1063 }
1064
1065 status = resp->data[0];
1066
1067 ret = status & PN533_CMD_RET_MASK;
1068 mi = status & PN533_CMD_MI_MASK;
1069
1070 skb_pull(resp, sizeof(status));
1071
1072 if (ret != PN533_CMD_RET_SUCCESS) {
1073 rc = -EIO;
1074 goto error;
1075 }
1076
1077 skb_queue_tail(&dev->resp_q, resp);
1078
1079 if (mi) {
1080 queue_work(dev->wq, &dev->mi_tm_rx_work);
1081 return -EINPROGRESS;
1082 }
1083
1084 skb = pn533_build_response(dev);
1085 if (!skb) {
1086 rc = -EIO;
1087 goto error;
1088 }
1089
1090 return nfc_tm_data_received(dev->nfc_dev, skb);
1091
1092 error:
1093 nfc_tm_deactivated(dev->nfc_dev);
1094 dev->tgt_mode = 0;
1095 skb_queue_purge(&dev->resp_q);
1096 dev_kfree_skb(resp);
1097
1098 return rc;
1099 }
1100
1101 static void pn533_wq_tm_mi_recv(struct work_struct *work)
1102 {
1103 struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work);
1104 struct sk_buff *skb;
1105 int rc;
1106
1107 dev_dbg(dev->dev, "%s\n", __func__);
1108
1109 skb = pn533_alloc_skb(dev, 0);
1110 if (!skb)
1111 return;
1112
1113 rc = pn533_send_cmd_direct_async(dev,
1114 PN533_CMD_TG_GET_DATA,
1115 skb,
1116 pn533_tm_get_data_complete,
1117 NULL);
1118
1119 if (rc < 0)
1120 dev_kfree_skb(skb);
1121 }
1122
1123 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
1124 struct sk_buff *resp);
1125 static void pn533_wq_tm_mi_send(struct work_struct *work)
1126 {
1127 struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
1128 struct sk_buff *skb;
1129 int rc;
1130
1131 dev_dbg(dev->dev, "%s\n", __func__);
1132
1133 /* Grab the first skb in the queue */
1134 skb = skb_dequeue(&dev->fragment_skb);
1135 if (skb == NULL) { /* No more data */
1136 /* Reset the queue for future use */
1137 skb_queue_head_init(&dev->fragment_skb);
1138 goto error;
1139 }
1140
1141 /* last entry - remove MI bit */
1142 if (skb_queue_len(&dev->fragment_skb) == 0) {
1143 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
1144 skb, pn533_tm_send_complete, NULL);
1145 } else
1146 rc = pn533_send_cmd_direct_async(dev,
1147 PN533_CMD_TG_SET_META_DATA,
1148 skb, pn533_tm_send_complete, NULL);
1149
1150 if (rc == 0) /* success */
1151 return;
1152
1153 dev_err(dev->dev,
1154 "Error %d when trying to perform set meta data_exchange", rc);
1155
1156 dev_kfree_skb(skb);
1157
1158 error:
1159 dev->phy_ops->send_ack(dev, GFP_KERNEL);
1160 queue_work(dev->wq, &dev->cmd_work);
1161 }
1162
1163 static void pn533_wq_tg_get_data(struct work_struct *work)
1164 {
1165 struct pn533 *dev = container_of(work, struct pn533, tg_work);
1166 struct sk_buff *skb;
1167 int rc;
1168
1169 dev_dbg(dev->dev, "%s\n", __func__);
1170
1171 skb = pn533_alloc_skb(dev, 0);
1172 if (!skb)
1173 return;
1174
1175 rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1176 pn533_tm_get_data_complete, NULL);
1177
1178 if (rc < 0)
1179 dev_kfree_skb(skb);
1180 }
1181
1182 #define ATR_REQ_GB_OFFSET 17
1183 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1184 {
1185 u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1186 size_t gb_len;
1187 int rc;
1188
1189 dev_dbg(dev->dev, "%s\n", __func__);
1190
1191 if (resp->len < ATR_REQ_GB_OFFSET + 1)
1192 return -EINVAL;
1193
1194 mode = resp->data[0];
1195 cmd = &resp->data[1];
1196
1197 dev_dbg(dev->dev, "Target mode 0x%x len %d\n",
1198 mode, resp->len);
1199
1200 if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1201 PN533_INIT_TARGET_RESP_ACTIVE)
1202 comm_mode = NFC_COMM_ACTIVE;
1203
1204 if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0) /* Only DEP supported */
1205 return -EOPNOTSUPP;
1206
1207 gb = cmd + ATR_REQ_GB_OFFSET;
1208 gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1209
1210 rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1211 comm_mode, gb, gb_len);
1212 if (rc < 0) {
1213 nfc_err(dev->dev,
1214 "Error when signaling target activation\n");
1215 return rc;
1216 }
1217
1218 dev->tgt_mode = 1;
1219 queue_work(dev->wq, &dev->tg_work);
1220
1221 return 0;
1222 }
1223
1224 static void pn533_listen_mode_timer(unsigned long data)
1225 {
1226 struct pn533 *dev = (struct pn533 *)data;
1227
1228 dev_dbg(dev->dev, "Listen mode timeout\n");
1229
1230 dev->cancel_listen = 1;
1231
1232 pn533_poll_next_mod(dev);
1233
1234 queue_delayed_work(dev->wq, &dev->poll_work,
1235 msecs_to_jiffies(PN533_POLL_INTERVAL));
1236 }
1237
1238 static int pn533_rf_complete(struct pn533 *dev, void *arg,
1239 struct sk_buff *resp)
1240 {
1241 int rc = 0;
1242
1243 dev_dbg(dev->dev, "%s\n", __func__);
1244
1245 if (IS_ERR(resp)) {
1246 rc = PTR_ERR(resp);
1247
1248 nfc_err(dev->dev, "RF setting error %d\n", rc);
1249
1250 return rc;
1251 }
1252
1253 queue_delayed_work(dev->wq, &dev->poll_work,
1254 msecs_to_jiffies(PN533_POLL_INTERVAL));
1255
1256 dev_kfree_skb(resp);
1257 return rc;
1258 }
1259
1260 static void pn533_wq_rf(struct work_struct *work)
1261 {
1262 struct pn533 *dev = container_of(work, struct pn533, rf_work);
1263 struct sk_buff *skb;
1264 int rc;
1265
1266 dev_dbg(dev->dev, "%s\n", __func__);
1267
1268 skb = pn533_alloc_skb(dev, 2);
1269 if (!skb)
1270 return;
1271
1272 *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD;
1273 *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
1274
1275 rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1276 pn533_rf_complete, NULL);
1277 if (rc < 0) {
1278 dev_kfree_skb(skb);
1279 nfc_err(dev->dev, "RF setting error %d\n", rc);
1280 }
1281 }
1282
1283 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg,
1284 struct sk_buff *resp)
1285 {
1286 struct pn533_cmd_jump_dep_response *rsp;
1287 struct nfc_target nfc_target;
1288 u8 target_gt_len;
1289 int rc;
1290
1291 if (IS_ERR(resp))
1292 return PTR_ERR(resp);
1293
1294 rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1295
1296 rc = rsp->status & PN533_CMD_RET_MASK;
1297 if (rc != PN533_CMD_RET_SUCCESS) {
1298 /* Not target found, turn radio off */
1299 queue_work(dev->wq, &dev->rf_work);
1300
1301 dev_kfree_skb(resp);
1302 return 0;
1303 }
1304
1305 dev_dbg(dev->dev, "Creating new target");
1306
1307 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1308 nfc_target.nfcid1_len = 10;
1309 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1310 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1311 if (rc)
1312 goto error;
1313
1314 dev->tgt_available_prots = 0;
1315 dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1316
1317 /* ATR_RES general bytes are located at offset 17 */
1318 target_gt_len = resp->len - 17;
1319 rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1320 rsp->gt, target_gt_len);
1321 if (!rc) {
1322 rc = nfc_dep_link_is_up(dev->nfc_dev,
1323 dev->nfc_dev->targets[0].idx,
1324 0, NFC_RF_INITIATOR);
1325
1326 if (!rc)
1327 pn533_poll_reset_mod_list(dev);
1328 }
1329 error:
1330 dev_kfree_skb(resp);
1331 return rc;
1332 }
1333
1334 #define PASSIVE_DATA_LEN 5
1335 static int pn533_poll_dep(struct nfc_dev *nfc_dev)
1336 {
1337 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1338 struct sk_buff *skb;
1339 int rc, skb_len;
1340 u8 *next, nfcid3[NFC_NFCID3_MAXSIZE];
1341 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1342
1343 dev_dbg(dev->dev, "%s", __func__);
1344
1345 if (!dev->gb) {
1346 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1347
1348 if (!dev->gb || !dev->gb_len) {
1349 dev->poll_dep = 0;
1350 queue_work(dev->wq, &dev->rf_work);
1351 }
1352 }
1353
1354 skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1355 skb_len += PASSIVE_DATA_LEN;
1356
1357 /* NFCID3 */
1358 skb_len += NFC_NFCID3_MAXSIZE;
1359 nfcid3[0] = 0x1;
1360 nfcid3[1] = 0xfe;
1361 get_random_bytes(nfcid3 + 2, 6);
1362
1363 skb = pn533_alloc_skb(dev, skb_len);
1364 if (!skb)
1365 return -ENOMEM;
1366
1367 *skb_put(skb, 1) = 0x01; /* Active */
1368 *skb_put(skb, 1) = 0x02; /* 424 kbps */
1369
1370 next = skb_put(skb, 1); /* Next */
1371 *next = 0;
1372
1373 /* Copy passive data */
1374 memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
1375 *next |= 1;
1376
1377 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1378 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
1379 NFC_NFCID3_MAXSIZE);
1380 *next |= 2;
1381
1382 memcpy(skb_put(skb, dev->gb_len), dev->gb, dev->gb_len);
1383 *next |= 4; /* We have some Gi */
1384
1385 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1386 pn533_poll_dep_complete, NULL);
1387
1388 if (rc < 0)
1389 dev_kfree_skb(skb);
1390
1391 return rc;
1392 }
1393
1394 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1395 struct sk_buff *resp)
1396 {
1397 struct pn533_poll_modulations *cur_mod;
1398 int rc;
1399
1400 dev_dbg(dev->dev, "%s\n", __func__);
1401
1402 if (IS_ERR(resp)) {
1403 rc = PTR_ERR(resp);
1404
1405 nfc_err(dev->dev, "%s Poll complete error %d\n",
1406 __func__, rc);
1407
1408 if (rc == -ENOENT) {
1409 if (dev->poll_mod_count != 0)
1410 return rc;
1411 goto stop_poll;
1412 } else if (rc < 0) {
1413 nfc_err(dev->dev,
1414 "Error %d when running poll\n", rc);
1415 goto stop_poll;
1416 }
1417 }
1418
1419 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1420
1421 if (cur_mod->len == 0) { /* Target mode */
1422 del_timer(&dev->listen_timer);
1423 rc = pn533_init_target_complete(dev, resp);
1424 goto done;
1425 }
1426
1427 /* Initiator mode */
1428 rc = pn533_start_poll_complete(dev, resp);
1429 if (!rc)
1430 goto done;
1431
1432 if (!dev->poll_mod_count) {
1433 dev_dbg(dev->dev, "Polling has been stopped\n");
1434 goto done;
1435 }
1436
1437 pn533_poll_next_mod(dev);
1438 /* Not target found, turn radio off */
1439 queue_work(dev->wq, &dev->rf_work);
1440
1441 done:
1442 dev_kfree_skb(resp);
1443 return rc;
1444
1445 stop_poll:
1446 nfc_err(dev->dev, "Polling operation has been stopped\n");
1447
1448 pn533_poll_reset_mod_list(dev);
1449 dev->poll_protocols = 0;
1450 return rc;
1451 }
1452
1453 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1454 struct pn533_poll_modulations *mod)
1455 {
1456 struct sk_buff *skb;
1457
1458 skb = pn533_alloc_skb(dev, mod->len);
1459 if (!skb)
1460 return NULL;
1461
1462 memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
1463
1464 return skb;
1465 }
1466
1467 static int pn533_send_poll_frame(struct pn533 *dev)
1468 {
1469 struct pn533_poll_modulations *mod;
1470 struct sk_buff *skb;
1471 int rc;
1472 u8 cmd_code;
1473
1474 mod = dev->poll_mod_active[dev->poll_mod_curr];
1475
1476 dev_dbg(dev->dev, "%s mod len %d\n",
1477 __func__, mod->len);
1478
1479 if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep) {
1480 dev->poll_dep = 0;
1481 return pn533_poll_dep(dev->nfc_dev);
1482 }
1483
1484 if (mod->len == 0) { /* Listen mode */
1485 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1486 skb = pn533_alloc_poll_tg_frame(dev);
1487 } else { /* Polling mode */
1488 cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET;
1489 skb = pn533_alloc_poll_in_frame(dev, mod);
1490 }
1491
1492 if (!skb) {
1493 nfc_err(dev->dev, "Failed to allocate skb\n");
1494 return -ENOMEM;
1495 }
1496
1497 rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1498 NULL);
1499 if (rc < 0) {
1500 dev_kfree_skb(skb);
1501 nfc_err(dev->dev, "Polling loop error %d\n", rc);
1502 }
1503
1504 return rc;
1505 }
1506
1507 static void pn533_wq_poll(struct work_struct *work)
1508 {
1509 struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1510 struct pn533_poll_modulations *cur_mod;
1511 int rc;
1512
1513 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1514
1515 dev_dbg(dev->dev,
1516 "%s cancel_listen %d modulation len %d\n",
1517 __func__, dev->cancel_listen, cur_mod->len);
1518
1519 if (dev->cancel_listen == 1) {
1520 dev->cancel_listen = 0;
1521 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC);
1522 }
1523
1524 rc = pn533_send_poll_frame(dev);
1525 if (rc)
1526 return;
1527
1528 if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1529 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1530 }
1531
1532 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1533 u32 im_protocols, u32 tm_protocols)
1534 {
1535 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1536 struct pn533_poll_modulations *cur_mod;
1537 u8 rand_mod;
1538 int rc;
1539
1540 dev_dbg(dev->dev,
1541 "%s: im protocols 0x%x tm protocols 0x%x\n",
1542 __func__, im_protocols, tm_protocols);
1543
1544 if (dev->tgt_active_prot) {
1545 nfc_err(dev->dev,
1546 "Cannot poll with a target already activated\n");
1547 return -EBUSY;
1548 }
1549
1550 if (dev->tgt_mode) {
1551 nfc_err(dev->dev,
1552 "Cannot poll while already being activated\n");
1553 return -EBUSY;
1554 }
1555
1556 if (tm_protocols) {
1557 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1558 if (dev->gb == NULL)
1559 tm_protocols = 0;
1560 }
1561
1562 pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1563 dev->poll_protocols = im_protocols;
1564 dev->listen_protocols = tm_protocols;
1565
1566 /* Do not always start polling from the same modulation */
1567 get_random_bytes(&rand_mod, sizeof(rand_mod));
1568 rand_mod %= dev->poll_mod_count;
1569 dev->poll_mod_curr = rand_mod;
1570
1571 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1572
1573 rc = pn533_send_poll_frame(dev);
1574
1575 /* Start listen timer */
1576 if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
1577 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1578
1579 return rc;
1580 }
1581
1582 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1583 {
1584 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1585
1586 del_timer(&dev->listen_timer);
1587
1588 if (!dev->poll_mod_count) {
1589 dev_dbg(dev->dev,
1590 "Polling operation was not running\n");
1591 return;
1592 }
1593
1594 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1595 flush_delayed_work(&dev->poll_work);
1596 pn533_poll_reset_mod_list(dev);
1597 }
1598
1599 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1600 {
1601 struct pn533_cmd_activate_response *rsp;
1602 u16 gt_len;
1603 int rc;
1604 struct sk_buff *skb;
1605 struct sk_buff *resp;
1606
1607 dev_dbg(dev->dev, "%s\n", __func__);
1608
1609 skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1610 if (!skb)
1611 return -ENOMEM;
1612
1613 *skb_put(skb, sizeof(u8)) = 1; /* TG */
1614 *skb_put(skb, sizeof(u8)) = 0; /* Next */
1615
1616 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1617 if (IS_ERR(resp))
1618 return PTR_ERR(resp);
1619
1620 rsp = (struct pn533_cmd_activate_response *)resp->data;
1621 rc = rsp->status & PN533_CMD_RET_MASK;
1622 if (rc != PN533_CMD_RET_SUCCESS) {
1623 nfc_err(dev->dev,
1624 "Target activation failed (error 0x%x)\n", rc);
1625 dev_kfree_skb(resp);
1626 return -EIO;
1627 }
1628
1629 /* ATR_RES general bytes are located at offset 16 */
1630 gt_len = resp->len - 16;
1631 rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1632
1633 dev_kfree_skb(resp);
1634 return rc;
1635 }
1636
1637 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1638 struct nfc_target *target, u32 protocol)
1639 {
1640 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1641 int rc;
1642
1643 dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol);
1644
1645 if (dev->poll_mod_count) {
1646 nfc_err(dev->dev,
1647 "Cannot activate while polling\n");
1648 return -EBUSY;
1649 }
1650
1651 if (dev->tgt_active_prot) {
1652 nfc_err(dev->dev,
1653 "There is already an active target\n");
1654 return -EBUSY;
1655 }
1656
1657 if (!dev->tgt_available_prots) {
1658 nfc_err(dev->dev,
1659 "There is no available target to activate\n");
1660 return -EINVAL;
1661 }
1662
1663 if (!(dev->tgt_available_prots & (1 << protocol))) {
1664 nfc_err(dev->dev,
1665 "Target doesn't support requested proto %u\n",
1666 protocol);
1667 return -EINVAL;
1668 }
1669
1670 if (protocol == NFC_PROTO_NFC_DEP) {
1671 rc = pn533_activate_target_nfcdep(dev);
1672 if (rc) {
1673 nfc_err(dev->dev,
1674 "Activating target with DEP failed %d\n", rc);
1675 return rc;
1676 }
1677 }
1678
1679 dev->tgt_active_prot = protocol;
1680 dev->tgt_available_prots = 0;
1681
1682 return 0;
1683 }
1684
1685 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg,
1686 struct sk_buff *resp)
1687 {
1688 int rc = 0;
1689
1690 dev_dbg(dev->dev, "%s\n", __func__);
1691
1692 if (IS_ERR(resp)) {
1693 rc = PTR_ERR(resp);
1694
1695 nfc_err(dev->dev, "Target release error %d\n", rc);
1696
1697 return rc;
1698 }
1699
1700 rc = resp->data[0] & PN533_CMD_RET_MASK;
1701 if (rc != PN533_CMD_RET_SUCCESS)
1702 nfc_err(dev->dev,
1703 "Error 0x%x when releasing the target\n", rc);
1704
1705 dev_kfree_skb(resp);
1706 return rc;
1707 }
1708
1709 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1710 struct nfc_target *target, u8 mode)
1711 {
1712 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1713 struct sk_buff *skb;
1714 int rc;
1715
1716 dev_dbg(dev->dev, "%s\n", __func__);
1717
1718 if (!dev->tgt_active_prot) {
1719 nfc_err(dev->dev, "There is no active target\n");
1720 return;
1721 }
1722
1723 dev->tgt_active_prot = 0;
1724 skb_queue_purge(&dev->resp_q);
1725
1726 skb = pn533_alloc_skb(dev, sizeof(u8));
1727 if (!skb)
1728 return;
1729
1730 *skb_put(skb, 1) = 1; /* TG*/
1731
1732 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb,
1733 pn533_deactivate_target_complete, NULL);
1734 if (rc < 0) {
1735 dev_kfree_skb(skb);
1736 nfc_err(dev->dev, "Target release error %d\n", rc);
1737 }
1738 }
1739
1740
1741 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1742 struct sk_buff *resp)
1743 {
1744 struct pn533_cmd_jump_dep_response *rsp;
1745 u8 target_gt_len;
1746 int rc;
1747 u8 active = *(u8 *)arg;
1748
1749 kfree(arg);
1750
1751 if (IS_ERR(resp))
1752 return PTR_ERR(resp);
1753
1754 if (dev->tgt_available_prots &&
1755 !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1756 nfc_err(dev->dev,
1757 "The target does not support DEP\n");
1758 rc = -EINVAL;
1759 goto error;
1760 }
1761
1762 rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1763
1764 rc = rsp->status & PN533_CMD_RET_MASK;
1765 if (rc != PN533_CMD_RET_SUCCESS) {
1766 nfc_err(dev->dev,
1767 "Bringing DEP link up failed (error 0x%x)\n", rc);
1768 goto error;
1769 }
1770
1771 if (!dev->tgt_available_prots) {
1772 struct nfc_target nfc_target;
1773
1774 dev_dbg(dev->dev, "Creating new target\n");
1775
1776 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1777 nfc_target.nfcid1_len = 10;
1778 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1779 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1780 if (rc)
1781 goto error;
1782
1783 dev->tgt_available_prots = 0;
1784 }
1785
1786 dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1787
1788 /* ATR_RES general bytes are located at offset 17 */
1789 target_gt_len = resp->len - 17;
1790 rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1791 rsp->gt, target_gt_len);
1792 if (rc == 0)
1793 rc = nfc_dep_link_is_up(dev->nfc_dev,
1794 dev->nfc_dev->targets[0].idx,
1795 !active, NFC_RF_INITIATOR);
1796
1797 error:
1798 dev_kfree_skb(resp);
1799 return rc;
1800 }
1801
1802 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
1803 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1804 u8 comm_mode, u8 *gb, size_t gb_len)
1805 {
1806 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1807 struct sk_buff *skb;
1808 int rc, skb_len;
1809 u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
1810 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1811
1812 dev_dbg(dev->dev, "%s\n", __func__);
1813
1814 if (dev->poll_mod_count) {
1815 nfc_err(dev->dev,
1816 "Cannot bring the DEP link up while polling\n");
1817 return -EBUSY;
1818 }
1819
1820 if (dev->tgt_active_prot) {
1821 nfc_err(dev->dev,
1822 "There is already an active target\n");
1823 return -EBUSY;
1824 }
1825
1826 skb_len = 3 + gb_len; /* ActPass + BR + Next */
1827 skb_len += PASSIVE_DATA_LEN;
1828
1829 /* NFCID3 */
1830 skb_len += NFC_NFCID3_MAXSIZE;
1831 if (target && !target->nfcid2_len) {
1832 nfcid3[0] = 0x1;
1833 nfcid3[1] = 0xfe;
1834 get_random_bytes(nfcid3 + 2, 6);
1835 }
1836
1837 skb = pn533_alloc_skb(dev, skb_len);
1838 if (!skb)
1839 return -ENOMEM;
1840
1841 *skb_put(skb, 1) = !comm_mode; /* ActPass */
1842 *skb_put(skb, 1) = 0x02; /* 424 kbps */
1843
1844 next = skb_put(skb, 1); /* Next */
1845 *next = 0;
1846
1847 /* Copy passive data */
1848 memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
1849 *next |= 1;
1850
1851 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1852 if (target && target->nfcid2_len)
1853 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
1854 target->nfcid2_len);
1855 else
1856 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
1857 NFC_NFCID3_MAXSIZE);
1858 *next |= 2;
1859
1860 if (gb != NULL && gb_len > 0) {
1861 memcpy(skb_put(skb, gb_len), gb, gb_len);
1862 *next |= 4; /* We have some Gi */
1863 } else {
1864 *next = 0;
1865 }
1866
1867 arg = kmalloc(sizeof(*arg), GFP_KERNEL);
1868 if (!arg) {
1869 dev_kfree_skb(skb);
1870 return -ENOMEM;
1871 }
1872
1873 *arg = !comm_mode;
1874
1875 pn533_rf_field(dev->nfc_dev, 0);
1876
1877 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1878 pn533_in_dep_link_up_complete, arg);
1879
1880 if (rc < 0) {
1881 dev_kfree_skb(skb);
1882 kfree(arg);
1883 }
1884
1885 return rc;
1886 }
1887
1888 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
1889 {
1890 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1891
1892 dev_dbg(dev->dev, "%s\n", __func__);
1893
1894 pn533_poll_reset_mod_list(dev);
1895
1896 if (dev->tgt_mode || dev->tgt_active_prot)
1897 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1898
1899 dev->tgt_active_prot = 0;
1900 dev->tgt_mode = 0;
1901
1902 skb_queue_purge(&dev->resp_q);
1903
1904 return 0;
1905 }
1906
1907 struct pn533_data_exchange_arg {
1908 data_exchange_cb_t cb;
1909 void *cb_context;
1910 };
1911
1912 static struct sk_buff *pn533_build_response(struct pn533 *dev)
1913 {
1914 struct sk_buff *skb, *tmp, *t;
1915 unsigned int skb_len = 0, tmp_len = 0;
1916
1917 dev_dbg(dev->dev, "%s\n", __func__);
1918
1919 if (skb_queue_empty(&dev->resp_q))
1920 return NULL;
1921
1922 if (skb_queue_len(&dev->resp_q) == 1) {
1923 skb = skb_dequeue(&dev->resp_q);
1924 goto out;
1925 }
1926
1927 skb_queue_walk_safe(&dev->resp_q, tmp, t)
1928 skb_len += tmp->len;
1929
1930 dev_dbg(dev->dev, "%s total length %d\n",
1931 __func__, skb_len);
1932
1933 skb = alloc_skb(skb_len, GFP_KERNEL);
1934 if (skb == NULL)
1935 goto out;
1936
1937 skb_put(skb, skb_len);
1938
1939 skb_queue_walk_safe(&dev->resp_q, tmp, t) {
1940 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
1941 tmp_len += tmp->len;
1942 }
1943
1944 out:
1945 skb_queue_purge(&dev->resp_q);
1946
1947 return skb;
1948 }
1949
1950 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
1951 struct sk_buff *resp)
1952 {
1953 struct pn533_data_exchange_arg *arg = _arg;
1954 struct sk_buff *skb;
1955 int rc = 0;
1956 u8 status, ret, mi;
1957
1958 dev_dbg(dev->dev, "%s\n", __func__);
1959
1960 if (IS_ERR(resp)) {
1961 rc = PTR_ERR(resp);
1962 goto _error;
1963 }
1964
1965 status = resp->data[0];
1966 ret = status & PN533_CMD_RET_MASK;
1967 mi = status & PN533_CMD_MI_MASK;
1968
1969 skb_pull(resp, sizeof(status));
1970
1971 if (ret != PN533_CMD_RET_SUCCESS) {
1972 nfc_err(dev->dev,
1973 "Exchanging data failed (error 0x%x)\n", ret);
1974 rc = -EIO;
1975 goto error;
1976 }
1977
1978 skb_queue_tail(&dev->resp_q, resp);
1979
1980 if (mi) {
1981 dev->cmd_complete_mi_arg = arg;
1982 queue_work(dev->wq, &dev->mi_rx_work);
1983 return -EINPROGRESS;
1984 }
1985
1986 /* Prepare for the next round */
1987 if (skb_queue_len(&dev->fragment_skb) > 0) {
1988 dev->cmd_complete_dep_arg = arg;
1989 queue_work(dev->wq, &dev->mi_tx_work);
1990
1991 return -EINPROGRESS;
1992 }
1993
1994 skb = pn533_build_response(dev);
1995 if (!skb) {
1996 rc = -ENOMEM;
1997 goto error;
1998 }
1999
2000 arg->cb(arg->cb_context, skb, 0);
2001 kfree(arg);
2002 return 0;
2003
2004 error:
2005 dev_kfree_skb(resp);
2006 _error:
2007 skb_queue_purge(&dev->resp_q);
2008 arg->cb(arg->cb_context, NULL, rc);
2009 kfree(arg);
2010 return rc;
2011 }
2012
2013 /*
2014 * Receive an incoming pn533 frame. skb contains only header and payload.
2015 * If skb == NULL, it is a notification that the link below is dead.
2016 */
2017 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2018 {
2019 if (!dev->cmd)
2020 goto sched_wq;
2021
2022 dev->cmd->status = status;
2023
2024 if (status != 0) {
2025 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2026 goto sched_wq;
2027 }
2028
2029 if (skb == NULL) {
2030 pr_err("NULL Frame -> link is dead\n");
2031 goto sched_wq;
2032 }
2033
2034 if (pn533_rx_frame_is_ack(skb->data)) {
2035 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2036 dev_kfree_skb(skb);
2037 return;
2038 }
2039
2040 print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2041 dev->ops->rx_frame_size(skb->data), false);
2042
2043 if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2044 nfc_err(dev->dev, "Received an invalid frame\n");
2045 dev->cmd->status = -EIO;
2046 } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2047 nfc_err(dev->dev, "It it not the response to the last command\n");
2048 dev->cmd->status = -EIO;
2049 }
2050
2051 dev->cmd->resp = skb;
2052
2053 sched_wq:
2054 queue_work(dev->wq, &dev->cmd_complete_work);
2055 }
2056 EXPORT_SYMBOL(pn533_recv_frame);
2057
2058 /* Split the Tx skb into small chunks */
2059 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2060 {
2061 struct sk_buff *frag;
2062 int frag_size;
2063
2064 do {
2065 /* Remaining size */
2066 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2067 frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2068 else
2069 frag_size = skb->len;
2070
2071 /* Allocate and reserve */
2072 frag = pn533_alloc_skb(dev, frag_size);
2073 if (!frag) {
2074 skb_queue_purge(&dev->fragment_skb);
2075 break;
2076 }
2077
2078 if (!dev->tgt_mode) {
2079 /* Reserve the TG/MI byte */
2080 skb_reserve(frag, 1);
2081
2082 /* MI + TG */
2083 if (frag_size == PN533_CMD_DATAFRAME_MAXLEN)
2084 *skb_push(frag, sizeof(u8)) =
2085 (PN533_CMD_MI_MASK | 1);
2086 else
2087 *skb_push(frag, sizeof(u8)) = 1; /* TG */
2088 }
2089
2090 memcpy(skb_put(frag, frag_size), skb->data, frag_size);
2091
2092 /* Reduce the size of incoming buffer */
2093 skb_pull(skb, frag_size);
2094
2095 /* Add this to skb_queue */
2096 skb_queue_tail(&dev->fragment_skb, frag);
2097
2098 } while (skb->len > 0);
2099
2100 dev_kfree_skb(skb);
2101
2102 return skb_queue_len(&dev->fragment_skb);
2103 }
2104
2105 static int pn533_transceive(struct nfc_dev *nfc_dev,
2106 struct nfc_target *target, struct sk_buff *skb,
2107 data_exchange_cb_t cb, void *cb_context)
2108 {
2109 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2110 struct pn533_data_exchange_arg *arg = NULL;
2111 int rc;
2112
2113 dev_dbg(dev->dev, "%s\n", __func__);
2114
2115 if (!dev->tgt_active_prot) {
2116 nfc_err(dev->dev,
2117 "Can't exchange data if there is no active target\n");
2118 rc = -EINVAL;
2119 goto error;
2120 }
2121
2122 arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2123 if (!arg) {
2124 rc = -ENOMEM;
2125 goto error;
2126 }
2127
2128 arg->cb = cb;
2129 arg->cb_context = cb_context;
2130
2131 switch (dev->device_type) {
2132 case PN533_DEVICE_PASORI:
2133 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2134 rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2135 skb,
2136 pn533_data_exchange_complete,
2137 arg);
2138
2139 break;
2140 }
2141 default:
2142 /* jumbo frame ? */
2143 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2144 rc = pn533_fill_fragment_skbs(dev, skb);
2145 if (rc <= 0)
2146 goto error;
2147
2148 skb = skb_dequeue(&dev->fragment_skb);
2149 if (!skb) {
2150 rc = -EIO;
2151 goto error;
2152 }
2153 } else {
2154 *skb_push(skb, sizeof(u8)) = 1; /* TG */
2155 }
2156
2157 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2158 skb, pn533_data_exchange_complete,
2159 arg);
2160
2161 break;
2162 }
2163
2164 if (rc < 0) /* rc from send_async */
2165 goto error;
2166
2167 return 0;
2168
2169 error:
2170 kfree(arg);
2171 dev_kfree_skb(skb);
2172 return rc;
2173 }
2174
2175 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2176 struct sk_buff *resp)
2177 {
2178 u8 status;
2179
2180 dev_dbg(dev->dev, "%s\n", __func__);
2181
2182 if (IS_ERR(resp))
2183 return PTR_ERR(resp);
2184
2185 status = resp->data[0];
2186
2187 /* Prepare for the next round */
2188 if (skb_queue_len(&dev->fragment_skb) > 0) {
2189 queue_work(dev->wq, &dev->mi_tm_tx_work);
2190 return -EINPROGRESS;
2191 }
2192 dev_kfree_skb(resp);
2193
2194 if (status != 0) {
2195 nfc_tm_deactivated(dev->nfc_dev);
2196
2197 dev->tgt_mode = 0;
2198
2199 return 0;
2200 }
2201
2202 queue_work(dev->wq, &dev->tg_work);
2203
2204 return 0;
2205 }
2206
2207 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2208 {
2209 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2210 int rc;
2211
2212 dev_dbg(dev->dev, "%s\n", __func__);
2213
2214 /* let's split in multiple chunks if size's too big */
2215 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2216 rc = pn533_fill_fragment_skbs(dev, skb);
2217 if (rc <= 0)
2218 goto error;
2219
2220 /* get the first skb */
2221 skb = skb_dequeue(&dev->fragment_skb);
2222 if (!skb) {
2223 rc = -EIO;
2224 goto error;
2225 }
2226
2227 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2228 pn533_tm_send_complete, NULL);
2229 } else {
2230 /* Send th skb */
2231 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2232 pn533_tm_send_complete, NULL);
2233 }
2234
2235 error:
2236 if (rc < 0) {
2237 dev_kfree_skb(skb);
2238 skb_queue_purge(&dev->fragment_skb);
2239 }
2240
2241 return rc;
2242 }
2243
2244 static void pn533_wq_mi_recv(struct work_struct *work)
2245 {
2246 struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2247 struct sk_buff *skb;
2248 int rc;
2249
2250 dev_dbg(dev->dev, "%s\n", __func__);
2251
2252 skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2253 if (!skb)
2254 goto error;
2255
2256 switch (dev->device_type) {
2257 case PN533_DEVICE_PASORI:
2258 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2259 rc = pn533_send_cmd_direct_async(dev,
2260 PN533_CMD_IN_COMM_THRU,
2261 skb,
2262 pn533_data_exchange_complete,
2263 dev->cmd_complete_mi_arg);
2264
2265 break;
2266 }
2267 default:
2268 *skb_put(skb, sizeof(u8)) = 1; /*TG*/
2269
2270 rc = pn533_send_cmd_direct_async(dev,
2271 PN533_CMD_IN_DATA_EXCHANGE,
2272 skb,
2273 pn533_data_exchange_complete,
2274 dev->cmd_complete_mi_arg);
2275
2276 break;
2277 }
2278
2279 if (rc == 0) /* success */
2280 return;
2281
2282 nfc_err(dev->dev,
2283 "Error %d when trying to perform data_exchange\n", rc);
2284
2285 dev_kfree_skb(skb);
2286 kfree(dev->cmd_complete_mi_arg);
2287
2288 error:
2289 dev->phy_ops->send_ack(dev, GFP_KERNEL);
2290 queue_work(dev->wq, &dev->cmd_work);
2291 }
2292
2293 static void pn533_wq_mi_send(struct work_struct *work)
2294 {
2295 struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2296 struct sk_buff *skb;
2297 int rc;
2298
2299 dev_dbg(dev->dev, "%s\n", __func__);
2300
2301 /* Grab the first skb in the queue */
2302 skb = skb_dequeue(&dev->fragment_skb);
2303
2304 if (skb == NULL) { /* No more data */
2305 /* Reset the queue for future use */
2306 skb_queue_head_init(&dev->fragment_skb);
2307 goto error;
2308 }
2309
2310 switch (dev->device_type) {
2311 case PN533_DEVICE_PASORI:
2312 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2313 rc = -EIO;
2314 break;
2315 }
2316
2317 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2318 skb,
2319 pn533_data_exchange_complete,
2320 dev->cmd_complete_dep_arg);
2321
2322 break;
2323
2324 default:
2325 /* Still some fragments? */
2326 rc = pn533_send_cmd_direct_async(dev,
2327 PN533_CMD_IN_DATA_EXCHANGE,
2328 skb,
2329 pn533_data_exchange_complete,
2330 dev->cmd_complete_dep_arg);
2331
2332 break;
2333 }
2334
2335 if (rc == 0) /* success */
2336 return;
2337
2338 nfc_err(dev->dev,
2339 "Error %d when trying to perform data_exchange\n", rc);
2340
2341 dev_kfree_skb(skb);
2342 kfree(dev->cmd_complete_dep_arg);
2343
2344 error:
2345 dev->phy_ops->send_ack(dev, GFP_KERNEL);
2346 queue_work(dev->wq, &dev->cmd_work);
2347 }
2348
2349 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2350 u8 cfgdata_len)
2351 {
2352 struct sk_buff *skb;
2353 struct sk_buff *resp;
2354 int skb_len;
2355
2356 dev_dbg(dev->dev, "%s\n", __func__);
2357
2358 skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2359
2360 skb = pn533_alloc_skb(dev, skb_len);
2361 if (!skb)
2362 return -ENOMEM;
2363
2364 *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2365 memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2366
2367 resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2368 if (IS_ERR(resp))
2369 return PTR_ERR(resp);
2370
2371 dev_kfree_skb(resp);
2372 return 0;
2373 }
2374
2375 static int pn533_get_firmware_version(struct pn533 *dev,
2376 struct pn533_fw_version *fv)
2377 {
2378 struct sk_buff *skb;
2379 struct sk_buff *resp;
2380
2381 skb = pn533_alloc_skb(dev, 0);
2382 if (!skb)
2383 return -ENOMEM;
2384
2385 resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2386 if (IS_ERR(resp))
2387 return PTR_ERR(resp);
2388
2389 fv->ic = resp->data[0];
2390 fv->ver = resp->data[1];
2391 fv->rev = resp->data[2];
2392 fv->support = resp->data[3];
2393
2394 dev_kfree_skb(resp);
2395 return 0;
2396 }
2397
2398 static int pn533_pasori_fw_reset(struct pn533 *dev)
2399 {
2400 struct sk_buff *skb;
2401 struct sk_buff *resp;
2402
2403 dev_dbg(dev->dev, "%s\n", __func__);
2404
2405 skb = pn533_alloc_skb(dev, sizeof(u8));
2406 if (!skb)
2407 return -ENOMEM;
2408
2409 *skb_put(skb, sizeof(u8)) = 0x1;
2410
2411 resp = pn533_send_cmd_sync(dev, 0x18, skb);
2412 if (IS_ERR(resp))
2413 return PTR_ERR(resp);
2414
2415 dev_kfree_skb(resp);
2416
2417 return 0;
2418 }
2419
2420 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2421 {
2422 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2423 u8 rf_field = !!rf;
2424 int rc;
2425
2426 rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2427
2428 rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2429 (u8 *)&rf_field, 1);
2430 if (rc) {
2431 nfc_err(dev->dev, "Error on setting RF field\n");
2432 return rc;
2433 }
2434
2435 return rc;
2436 }
2437
2438 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2439 {
2440 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2441 struct sk_buff *skb;
2442 struct sk_buff *resp;
2443
2444 skb = pn533_alloc_skb(dev, 1);
2445 if (!skb)
2446 return -ENOMEM;
2447
2448 *skb_put(skb, 1) = 0x01;
2449
2450 resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2451 if (IS_ERR(resp))
2452 return PTR_ERR(resp);
2453
2454 dev_kfree_skb(resp);
2455 return 0;
2456 }
2457
2458 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2459 {
2460 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2461
2462 if (dev->device_type == PN533_DEVICE_PN532) {
2463 int rc = pn532_sam_configuration(nfc_dev);
2464
2465 if (rc)
2466 return rc;
2467 }
2468
2469 return pn533_rf_field(nfc_dev, 1);
2470 }
2471
2472 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2473 {
2474 return pn533_rf_field(nfc_dev, 0);
2475 }
2476
2477 static struct nfc_ops pn533_nfc_ops = {
2478 .dev_up = pn533_dev_up,
2479 .dev_down = pn533_dev_down,
2480 .dep_link_up = pn533_dep_link_up,
2481 .dep_link_down = pn533_dep_link_down,
2482 .start_poll = pn533_start_poll,
2483 .stop_poll = pn533_stop_poll,
2484 .activate_target = pn533_activate_target,
2485 .deactivate_target = pn533_deactivate_target,
2486 .im_transceive = pn533_transceive,
2487 .tm_send = pn533_tm_send,
2488 };
2489
2490 static int pn533_setup(struct pn533 *dev)
2491 {
2492 struct pn533_config_max_retries max_retries;
2493 struct pn533_config_timing timing;
2494 u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2495 int rc;
2496
2497 switch (dev->device_type) {
2498 case PN533_DEVICE_STD:
2499 case PN533_DEVICE_PASORI:
2500 case PN533_DEVICE_ACR122U:
2501 case PN533_DEVICE_PN532:
2502 max_retries.mx_rty_atr = 0x2;
2503 max_retries.mx_rty_psl = 0x1;
2504 max_retries.mx_rty_passive_act =
2505 PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2506
2507 timing.rfu = PN533_CONFIG_TIMING_102;
2508 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2509 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2510
2511 break;
2512
2513 default:
2514 nfc_err(dev->dev, "Unknown device type %d\n",
2515 dev->device_type);
2516 return -EINVAL;
2517 }
2518
2519 rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2520 (u8 *)&max_retries, sizeof(max_retries));
2521 if (rc) {
2522 nfc_err(dev->dev,
2523 "Error on setting MAX_RETRIES config\n");
2524 return rc;
2525 }
2526
2527
2528 rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2529 (u8 *)&timing, sizeof(timing));
2530 if (rc) {
2531 nfc_err(dev->dev, "Error on setting RF timings\n");
2532 return rc;
2533 }
2534
2535 switch (dev->device_type) {
2536 case PN533_DEVICE_STD:
2537 case PN533_DEVICE_PN532:
2538 break;
2539
2540 case PN533_DEVICE_PASORI:
2541 pn533_pasori_fw_reset(dev);
2542
2543 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2544 pasori_cfg, 3);
2545 if (rc) {
2546 nfc_err(dev->dev,
2547 "Error while settings PASORI config\n");
2548 return rc;
2549 }
2550
2551 pn533_pasori_fw_reset(dev);
2552
2553 break;
2554 }
2555
2556 return 0;
2557 }
2558
2559 struct pn533 *pn533_register_device(u32 device_type,
2560 u32 protocols,
2561 enum pn533_protocol_type protocol_type,
2562 void *phy,
2563 struct pn533_phy_ops *phy_ops,
2564 struct pn533_frame_ops *fops,
2565 struct device *dev,
2566 struct device *parent)
2567 {
2568 struct pn533_fw_version fw_ver;
2569 struct pn533 *priv;
2570 int rc = -ENOMEM;
2571
2572 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2573 if (!priv)
2574 return ERR_PTR(-ENOMEM);
2575
2576 priv->phy = phy;
2577 priv->phy_ops = phy_ops;
2578 priv->dev = dev;
2579 if (fops != NULL)
2580 priv->ops = fops;
2581 else
2582 priv->ops = &pn533_std_frame_ops;
2583
2584 priv->protocol_type = protocol_type;
2585 priv->device_type = device_type;
2586
2587 mutex_init(&priv->cmd_lock);
2588
2589 INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2590 INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2591 INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2592 INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2593 INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2594 INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2595 INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2596 INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2597 INIT_WORK(&priv->rf_work, pn533_wq_rf);
2598 priv->wq = alloc_ordered_workqueue("pn533", 0);
2599 if (priv->wq == NULL)
2600 goto error;
2601
2602 init_timer(&priv->listen_timer);
2603 priv->listen_timer.data = (unsigned long) priv;
2604 priv->listen_timer.function = pn533_listen_mode_timer;
2605
2606 skb_queue_head_init(&priv->resp_q);
2607 skb_queue_head_init(&priv->fragment_skb);
2608
2609 INIT_LIST_HEAD(&priv->cmd_queue);
2610
2611 memset(&fw_ver, 0, sizeof(fw_ver));
2612 rc = pn533_get_firmware_version(priv, &fw_ver);
2613 if (rc < 0)
2614 goto destroy_wq;
2615
2616 nfc_info(dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2617 fw_ver.ic, fw_ver.ver, fw_ver.rev);
2618
2619
2620 priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2621 priv->ops->tx_header_len +
2622 PN533_CMD_DATAEXCH_HEAD_LEN,
2623 priv->ops->tx_tail_len);
2624 if (!priv->nfc_dev) {
2625 rc = -ENOMEM;
2626 goto destroy_wq;
2627 }
2628
2629 nfc_set_parent_dev(priv->nfc_dev, parent);
2630 nfc_set_drvdata(priv->nfc_dev, priv);
2631
2632 rc = nfc_register_device(priv->nfc_dev);
2633 if (rc)
2634 goto free_nfc_dev;
2635
2636 rc = pn533_setup(priv);
2637 if (rc)
2638 goto unregister_nfc_dev;
2639
2640 return priv;
2641
2642 unregister_nfc_dev:
2643 nfc_unregister_device(priv->nfc_dev);
2644
2645 free_nfc_dev:
2646 nfc_free_device(priv->nfc_dev);
2647
2648 destroy_wq:
2649 destroy_workqueue(priv->wq);
2650 error:
2651 kfree(priv);
2652 return ERR_PTR(rc);
2653 }
2654 EXPORT_SYMBOL_GPL(pn533_register_device);
2655
2656 void pn533_unregister_device(struct pn533 *priv)
2657 {
2658 struct pn533_cmd *cmd, *n;
2659
2660 nfc_unregister_device(priv->nfc_dev);
2661 nfc_free_device(priv->nfc_dev);
2662
2663 flush_delayed_work(&priv->poll_work);
2664 destroy_workqueue(priv->wq);
2665
2666 skb_queue_purge(&priv->resp_q);
2667
2668 del_timer(&priv->listen_timer);
2669
2670 list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2671 list_del(&cmd->queue);
2672 kfree(cmd);
2673 }
2674
2675 kfree(priv);
2676 }
2677 EXPORT_SYMBOL_GPL(pn533_unregister_device);
2678
2679
2680 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
2681 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2682 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
2683 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2684 MODULE_VERSION(VERSION);
2685 MODULE_LICENSE("GPL");
CRIS linux kernel tree