1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Driver for NXP PN533 NFC Chip - core functions
4 *
5 * Copyright (C) 2011 Instituto Nokia de Tecnologia
6 * Copyright (C) 2012-2013 Tieto Poland
7 */
8
9 #include <linux/device.h>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/nfc.h>
14 #include <linux/netdevice.h>
15 #include <net/nfc/nfc.h>
16 #include "pn533.h"
17
18 #define VERSION "0.3"
19
20 /* How much time we spend listening for initiators */
21 #define PN533_LISTEN_TIME 2
22 /* Delay between each poll frame (ms) */
23 #define PN533_POLL_INTERVAL 10
24
25 /* structs for pn533 commands */
26
27 /* PN533_CMD_GET_FIRMWARE_VERSION */
28 struct pn533_fw_version {
29 u8 ic;
30 u8 ver;
31 u8 rev;
32 u8 support;
33 };
34
35 /* PN533_CMD_RF_CONFIGURATION */
36 #define PN533_CFGITEM_RF_FIELD 0x01
37 #define PN533_CFGITEM_TIMING 0x02
38 #define PN533_CFGITEM_MAX_RETRIES 0x05
39 #define PN533_CFGITEM_PASORI 0x82
40
41 #define PN533_CFGITEM_RF_FIELD_AUTO_RFCA 0x2
42 #define PN533_CFGITEM_RF_FIELD_ON 0x1
43 #define PN533_CFGITEM_RF_FIELD_OFF 0x0
44
45 #define PN533_CONFIG_TIMING_102 0xb
46 #define PN533_CONFIG_TIMING_204 0xc
47 #define PN533_CONFIG_TIMING_409 0xd
48 #define PN533_CONFIG_TIMING_819 0xe
49
50 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
51 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
52
53 struct pn533_config_max_retries {
54 u8 mx_rty_atr;
55 u8 mx_rty_psl;
56 u8 mx_rty_passive_act;
57 } __packed;
58
59 struct pn533_config_timing {
60 u8 rfu;
61 u8 atr_res_timeout;
62 u8 dep_timeout;
63 } __packed;
64
65 /* PN533_CMD_IN_LIST_PASSIVE_TARGET */
66
67 /* felica commands opcode */
68 #define PN533_FELICA_OPC_SENSF_REQ 0
69 #define PN533_FELICA_OPC_SENSF_RES 1
70 /* felica SENSF_REQ parameters */
71 #define PN533_FELICA_SENSF_SC_ALL 0xFFFF
72 #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
73 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
74 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
75
76 /* type B initiator_data values */
77 #define PN533_TYPE_B_AFI_ALL_FAMILIES 0
78 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
79 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
80
81 union pn533_cmd_poll_initdata {
82 struct {
83 u8 afi;
84 u8 polling_method;
85 } __packed type_b;
86 struct {
87 u8 opcode;
88 __be16 sc;
89 u8 rc;
90 u8 tsn;
91 } __packed felica;
92 };
93
94 struct pn533_poll_modulations {
95 struct {
96 u8 maxtg;
97 u8 brty;
98 union pn533_cmd_poll_initdata initiator_data;
99 } __packed data;
100 u8 len;
101 };
102
103 static const struct pn533_poll_modulations poll_mod[] = {
104 [PN533_POLL_MOD_106KBPS_A] = {
105 .data = {
106 .maxtg = 1,
107 .brty = 0,
108 },
109 .len = 2,
110 },
111 [PN533_POLL_MOD_212KBPS_FELICA] = {
112 .data = {
113 .maxtg = 1,
114 .brty = 1,
115 .initiator_data.felica = {
116 .opcode = PN533_FELICA_OPC_SENSF_REQ,
117 .sc = PN533_FELICA_SENSF_SC_ALL,
118 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
119 .tsn = 0x03,
120 },
121 },
122 .len = 7,
123 },
124 [PN533_POLL_MOD_424KBPS_FELICA] = {
125 .data = {
126 .maxtg = 1,
127 .brty = 2,
128 .initiator_data.felica = {
129 .opcode = PN533_FELICA_OPC_SENSF_REQ,
130 .sc = PN533_FELICA_SENSF_SC_ALL,
131 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
132 .tsn = 0x03,
133 },
134 },
135 .len = 7,
136 },
137 [PN533_POLL_MOD_106KBPS_JEWEL] = {
138 .data = {
139 .maxtg = 1,
140 .brty = 4,
141 },
142 .len = 2,
143 },
144 [PN533_POLL_MOD_847KBPS_B] = {
145 .data = {
146 .maxtg = 1,
147 .brty = 8,
148 .initiator_data.type_b = {
149 .afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
150 .polling_method =
151 PN533_TYPE_B_POLL_METHOD_TIMESLOT,
152 },
153 },
154 .len = 3,
155 },
156 [PN533_LISTEN_MOD] = {
157 .len = 0,
158 },
159 };
160
161 /* PN533_CMD_IN_ATR */
162
163 struct pn533_cmd_activate_response {
164 u8 status;
165 u8 nfcid3t[10];
166 u8 didt;
167 u8 bst;
168 u8 brt;
169 u8 to;
170 u8 ppt;
171 /* optional */
172 u8 gt[];
173 } __packed;
174
175 struct pn533_cmd_jump_dep_response {
176 u8 status;
177 u8 tg;
178 u8 nfcid3t[10];
179 u8 didt;
180 u8 bst;
181 u8 brt;
182 u8 to;
183 u8 ppt;
184 /* optional */
185 u8 gt[];
186 } __packed;
187
188 struct pn532_autopoll_resp {
189 u8 type;
190 u8 ln;
191 u8 tg;
192 u8 tgdata[];
193 };
194
195 /* PN532_CMD_IN_AUTOPOLL */
196 #define PN532_AUTOPOLL_POLLNR_INFINITE 0xff
197 #define PN532_AUTOPOLL_PERIOD 0x03 /* in units of 150 ms */
198
199 #define PN532_AUTOPOLL_TYPE_GENERIC_106 0x00
200 #define PN532_AUTOPOLL_TYPE_GENERIC_212 0x01
201 #define PN532_AUTOPOLL_TYPE_GENERIC_424 0x02
202 #define PN532_AUTOPOLL_TYPE_JEWEL 0x04
203 #define PN532_AUTOPOLL_TYPE_MIFARE 0x10
204 #define PN532_AUTOPOLL_TYPE_FELICA212 0x11
205 #define PN532_AUTOPOLL_TYPE_FELICA424 0x12
206 #define PN532_AUTOPOLL_TYPE_ISOA 0x20
207 #define PN532_AUTOPOLL_TYPE_ISOB 0x23
208 #define PN532_AUTOPOLL_TYPE_DEP_PASSIVE_106 0x40
209 #define PN532_AUTOPOLL_TYPE_DEP_PASSIVE_212 0x41
210 #define PN532_AUTOPOLL_TYPE_DEP_PASSIVE_424 0x42
211 #define PN532_AUTOPOLL_TYPE_DEP_ACTIVE_106 0x80
212 #define PN532_AUTOPOLL_TYPE_DEP_ACTIVE_212 0x81
213 #define PN532_AUTOPOLL_TYPE_DEP_ACTIVE_424 0x82
214
215 /* PN533_TG_INIT_AS_TARGET */
216 #define PN533_INIT_TARGET_PASSIVE 0x1
217 #define PN533_INIT_TARGET_DEP 0x2
218
219 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
220 #define PN533_INIT_TARGET_RESP_ACTIVE 0x1
221 #define PN533_INIT_TARGET_RESP_DEP 0x4
222
223 /* The rule: value(high byte) + value(low byte) + checksum = 0 */
pn533_ext_checksum(u16 value)224 static inline u8 pn533_ext_checksum(u16 value)
225 {
226 return ~(u8)(((value & 0xFF00) >> 8) + (u8)(value & 0xFF)) + 1;
227 }
228
229 /* The rule: value + checksum = 0 */
pn533_std_checksum(u8 value)230 static inline u8 pn533_std_checksum(u8 value)
231 {
232 return ~value + 1;
233 }
234
235 /* The rule: sum(data elements) + checksum = 0 */
pn533_std_data_checksum(u8 * data,int datalen)236 static u8 pn533_std_data_checksum(u8 *data, int datalen)
237 {
238 u8 sum = 0;
239 int i;
240
241 for (i = 0; i < datalen; i++)
242 sum += data[i];
243
244 return pn533_std_checksum(sum);
245 }
246
pn533_std_tx_frame_init(void * _frame,u8 cmd_code)247 static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code)
248 {
249 struct pn533_std_frame *frame = _frame;
250
251 frame->preamble = 0;
252 frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF);
253 PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT;
254 PN533_FRAME_CMD(frame) = cmd_code;
255 frame->datalen = 2;
256 }
257
pn533_std_tx_frame_finish(void * _frame)258 static void pn533_std_tx_frame_finish(void *_frame)
259 {
260 struct pn533_std_frame *frame = _frame;
261
262 frame->datalen_checksum = pn533_std_checksum(frame->datalen);
263
264 PN533_STD_FRAME_CHECKSUM(frame) =
265 pn533_std_data_checksum(frame->data, frame->datalen);
266
267 PN533_STD_FRAME_POSTAMBLE(frame) = 0;
268 }
269
pn533_std_tx_update_payload_len(void * _frame,int len)270 static void pn533_std_tx_update_payload_len(void *_frame, int len)
271 {
272 struct pn533_std_frame *frame = _frame;
273
274 frame->datalen += len;
275 }
276
pn533_std_rx_frame_is_valid(void * _frame,struct pn533 * dev)277 static bool pn533_std_rx_frame_is_valid(void *_frame, struct pn533 *dev)
278 {
279 u8 checksum;
280 struct pn533_std_frame *stdf = _frame;
281
282 if (stdf->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
283 return false;
284
285 if (likely(!PN533_STD_IS_EXTENDED(stdf))) {
286 /* Standard frame code */
287 dev->ops->rx_header_len = PN533_STD_FRAME_HEADER_LEN;
288
289 checksum = pn533_std_checksum(stdf->datalen);
290 if (checksum != stdf->datalen_checksum)
291 return false;
292
293 checksum = pn533_std_data_checksum(stdf->data, stdf->datalen);
294 if (checksum != PN533_STD_FRAME_CHECKSUM(stdf))
295 return false;
296 } else {
297 /* Extended */
298 struct pn533_ext_frame *eif = _frame;
299
300 dev->ops->rx_header_len = PN533_EXT_FRAME_HEADER_LEN;
301
302 checksum = pn533_ext_checksum(be16_to_cpu(eif->datalen));
303 if (checksum != eif->datalen_checksum)
304 return false;
305
306 /* check data checksum */
307 checksum = pn533_std_data_checksum(eif->data,
308 be16_to_cpu(eif->datalen));
309 if (checksum != PN533_EXT_FRAME_CHECKSUM(eif))
310 return false;
311 }
312
313 return true;
314 }
315
pn533_rx_frame_is_ack(void * _frame)316 bool pn533_rx_frame_is_ack(void *_frame)
317 {
318 struct pn533_std_frame *frame = _frame;
319
320 if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
321 return false;
322
323 if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
324 return false;
325
326 return true;
327 }
328 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_ack);
329
pn533_std_rx_frame_size(void * frame)330 static inline int pn533_std_rx_frame_size(void *frame)
331 {
332 struct pn533_std_frame *f = frame;
333
334 /* check for Extended Information frame */
335 if (PN533_STD_IS_EXTENDED(f)) {
336 struct pn533_ext_frame *eif = frame;
337
338 return sizeof(struct pn533_ext_frame)
339 + be16_to_cpu(eif->datalen) + PN533_STD_FRAME_TAIL_LEN;
340 }
341
342 return sizeof(struct pn533_std_frame) + f->datalen +
343 PN533_STD_FRAME_TAIL_LEN;
344 }
345
pn533_std_get_cmd_code(void * frame)346 static u8 pn533_std_get_cmd_code(void *frame)
347 {
348 struct pn533_std_frame *f = frame;
349 struct pn533_ext_frame *eif = frame;
350
351 if (PN533_STD_IS_EXTENDED(f))
352 return PN533_FRAME_CMD(eif);
353 else
354 return PN533_FRAME_CMD(f);
355 }
356
pn533_rx_frame_is_cmd_response(struct pn533 * dev,void * frame)357 bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
358 {
359 return (dev->ops->get_cmd_code(frame) ==
360 PN533_CMD_RESPONSE(dev->cmd->code));
361 }
362 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_cmd_response);
363
364
365 static struct pn533_frame_ops pn533_std_frame_ops = {
366 .tx_frame_init = pn533_std_tx_frame_init,
367 .tx_frame_finish = pn533_std_tx_frame_finish,
368 .tx_update_payload_len = pn533_std_tx_update_payload_len,
369 .tx_header_len = PN533_STD_FRAME_HEADER_LEN,
370 .tx_tail_len = PN533_STD_FRAME_TAIL_LEN,
371
372 .rx_is_frame_valid = pn533_std_rx_frame_is_valid,
373 .rx_frame_size = pn533_std_rx_frame_size,
374 .rx_header_len = PN533_STD_FRAME_HEADER_LEN,
375 .rx_tail_len = PN533_STD_FRAME_TAIL_LEN,
376
377 .max_payload_len = PN533_STD_FRAME_MAX_PAYLOAD_LEN,
378 .get_cmd_code = pn533_std_get_cmd_code,
379 };
380
pn533_build_cmd_frame(struct pn533 * dev,u8 cmd_code,struct sk_buff * skb)381 static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
382 struct sk_buff *skb)
383 {
384 /* payload is already there, just update datalen */
385 int payload_len = skb->len;
386 struct pn533_frame_ops *ops = dev->ops;
387
388
389 skb_push(skb, ops->tx_header_len);
390 skb_put(skb, ops->tx_tail_len);
391
392 ops->tx_frame_init(skb->data, cmd_code);
393 ops->tx_update_payload_len(skb->data, payload_len);
394 ops->tx_frame_finish(skb->data);
395 }
396
pn533_send_async_complete(struct pn533 * dev)397 static int pn533_send_async_complete(struct pn533 *dev)
398 {
399 struct pn533_cmd *cmd = dev->cmd;
400 struct sk_buff *resp;
401 int status, rc = 0;
402
403 if (!cmd) {
404 dev_dbg(dev->dev, "%s: cmd not set\n", __func__);
405 goto done;
406 }
407
408 dev_kfree_skb(cmd->req);
409
410 status = cmd->status;
411 resp = cmd->resp;
412
413 if (status < 0) {
414 rc = cmd->complete_cb(dev, cmd->complete_cb_context,
415 ERR_PTR(status));
416 dev_kfree_skb(resp);
417 goto done;
418 }
419
420 /* when no response is set we got interrupted */
421 if (!resp)
422 resp = ERR_PTR(-EINTR);
423
424 if (!IS_ERR(resp)) {
425 skb_pull(resp, dev->ops->rx_header_len);
426 skb_trim(resp, resp->len - dev->ops->rx_tail_len);
427 }
428
429 rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp);
430
431 done:
432 kfree(cmd);
433 dev->cmd = NULL;
434 return rc;
435 }
436
pn533_send_cmd_frame(struct pn533 * dev,struct pn533_cmd * cmd)437 static int pn533_send_cmd_frame(struct pn533 *dev, struct pn533_cmd *cmd)
438 {
439 struct sk_buff *req = cmd->req;
440 int rc;
441
442 skb_get(req);
443 dev->cmd = cmd;
444 rc = dev->phy_ops->send_frame(dev, req);
445 dev_kfree_skb(req);
446 return rc;
447 }
448
__pn533_send_async(struct pn533 * dev,u8 cmd_code,struct sk_buff * req,pn533_send_async_complete_t complete_cb,void * complete_cb_context)449 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
450 struct sk_buff *req,
451 pn533_send_async_complete_t complete_cb,
452 void *complete_cb_context)
453 {
454 struct pn533_cmd *cmd;
455 int rc = 0;
456
457 dev_dbg(dev->dev, "Sending command 0x%x\n", cmd_code);
458
459 cmd = kzalloc_obj(*cmd);
460 if (!cmd)
461 return -ENOMEM;
462
463 cmd->code = cmd_code;
464 cmd->req = req;
465 cmd->complete_cb = complete_cb;
466 cmd->complete_cb_context = complete_cb_context;
467
468 pn533_build_cmd_frame(dev, cmd_code, req);
469
470 mutex_lock(&dev->cmd_lock);
471
472 if (!dev->cmd_pending) {
473 rc = pn533_send_cmd_frame(dev, cmd);
474 if (rc) {
475 dev->cmd = NULL;
476 goto error;
477 }
478
479 dev->cmd_pending = 1;
480 goto unlock;
481 }
482
483 dev_dbg(dev->dev, "%s Queueing command 0x%x\n",
484 __func__, cmd_code);
485
486 INIT_LIST_HEAD(&cmd->queue);
487 list_add_tail(&cmd->queue, &dev->cmd_queue);
488
489 goto unlock;
490
491 error:
492 kfree(cmd);
493 unlock:
494 mutex_unlock(&dev->cmd_lock);
495 return rc;
496 }
497
pn533_send_data_async(struct pn533 * dev,u8 cmd_code,struct sk_buff * req,pn533_send_async_complete_t complete_cb,void * complete_cb_context)498 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
499 struct sk_buff *req,
500 pn533_send_async_complete_t complete_cb,
501 void *complete_cb_context)
502 {
503 return __pn533_send_async(dev, cmd_code, req, complete_cb,
504 complete_cb_context);
505 }
506
pn533_send_cmd_async(struct pn533 * dev,u8 cmd_code,struct sk_buff * req,pn533_send_async_complete_t complete_cb,void * complete_cb_context)507 static int pn533_send_cmd_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 return __pn533_send_async(dev, cmd_code, req, complete_cb,
513 complete_cb_context);
514 }
515
516 /*
517 * pn533_send_cmd_direct_async
518 *
519 * The function sends a priority cmd directly to the chip omitting the cmd
520 * queue. It's intended to be used by chaining mechanism of received responses
521 * where the host has to request every single chunk of data before scheduling
522 * next cmd from the queue.
523 */
pn533_send_cmd_direct_async(struct pn533 * dev,u8 cmd_code,struct sk_buff * req,pn533_send_async_complete_t complete_cb,void * complete_cb_context)524 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
525 struct sk_buff *req,
526 pn533_send_async_complete_t complete_cb,
527 void *complete_cb_context)
528 {
529 struct pn533_cmd *cmd;
530 int rc;
531
532 cmd = kzalloc_obj(*cmd);
533 if (!cmd)
534 return -ENOMEM;
535
536 cmd->code = cmd_code;
537 cmd->req = req;
538 cmd->complete_cb = complete_cb;
539 cmd->complete_cb_context = complete_cb_context;
540
541 pn533_build_cmd_frame(dev, cmd_code, req);
542
543 rc = pn533_send_cmd_frame(dev, cmd);
544 if (rc < 0) {
545 dev->cmd = NULL;
546 kfree(cmd);
547 }
548
549 return rc;
550 }
551
pn533_wq_cmd_complete(struct work_struct * work)552 static void pn533_wq_cmd_complete(struct work_struct *work)
553 {
554 struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
555 int rc;
556
557 rc = pn533_send_async_complete(dev);
558 if (rc != -EINPROGRESS)
559 queue_work(dev->wq, &dev->cmd_work);
560 }
561
pn533_wq_cmd(struct work_struct * work)562 static void pn533_wq_cmd(struct work_struct *work)
563 {
564 struct pn533 *dev = container_of(work, struct pn533, cmd_work);
565 struct pn533_cmd *cmd;
566 int rc;
567
568 mutex_lock(&dev->cmd_lock);
569
570 if (list_empty(&dev->cmd_queue)) {
571 dev->cmd_pending = 0;
572 mutex_unlock(&dev->cmd_lock);
573 return;
574 }
575
576 cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
577
578 list_del(&cmd->queue);
579
580 mutex_unlock(&dev->cmd_lock);
581
582 rc = pn533_send_cmd_frame(dev, cmd);
583 if (rc < 0) {
584 dev->cmd = NULL;
585 dev_kfree_skb(cmd->req);
586 kfree(cmd);
587 return;
588 }
589
590 }
591
592 struct pn533_sync_cmd_response {
593 struct sk_buff *resp;
594 struct completion done;
595 };
596
pn533_send_sync_complete(struct pn533 * dev,void * _arg,struct sk_buff * resp)597 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
598 struct sk_buff *resp)
599 {
600 struct pn533_sync_cmd_response *arg = _arg;
601
602 arg->resp = resp;
603 complete(&arg->done);
604
605 return 0;
606 }
607
608 /* pn533_send_cmd_sync
609 *
610 * Please note the req parameter is freed inside the function to
611 * limit a number of return value interpretations by the caller.
612 *
613 * 1. negative in case of error during TX path -> req should be freed
614 *
615 * 2. negative in case of error during RX path -> req should not be freed
616 * as it's been already freed at the beginning of RX path by
617 * async_complete_cb.
618 *
619 * 3. valid pointer in case of successful RX path
620 *
621 * A caller has to check a return value with IS_ERR macro. If the test pass,
622 * the returned pointer is valid.
623 *
624 */
pn533_send_cmd_sync(struct pn533 * dev,u8 cmd_code,struct sk_buff * req)625 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
626 struct sk_buff *req)
627 {
628 int rc;
629 struct pn533_sync_cmd_response arg;
630
631 init_completion(&arg.done);
632
633 rc = pn533_send_cmd_async(dev, cmd_code, req,
634 pn533_send_sync_complete, &arg);
635 if (rc) {
636 dev_kfree_skb(req);
637 return ERR_PTR(rc);
638 }
639
640 wait_for_completion(&arg.done);
641
642 return arg.resp;
643 }
644
pn533_alloc_skb(struct pn533 * dev,unsigned int size)645 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
646 {
647 struct sk_buff *skb;
648
649 skb = alloc_skb(dev->ops->tx_header_len +
650 size +
651 dev->ops->tx_tail_len, GFP_KERNEL);
652
653 if (skb)
654 skb_reserve(skb, dev->ops->tx_header_len);
655
656 return skb;
657 }
658
659 struct pn533_target_type_a {
660 __be16 sens_res;
661 u8 sel_res;
662 u8 nfcid_len;
663 u8 nfcid_data[];
664 } __packed;
665
666
667 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
668 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
669 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
670
671 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
672 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
673
674 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
675 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
676
677 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
678 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
679 #define PN533_TYPE_A_SEL_PROT_DEP 2
680 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
681
pn533_target_type_a_is_valid(struct pn533_target_type_a * type_a,int target_data_len)682 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
683 int target_data_len)
684 {
685 u8 ssd;
686 u8 platconf;
687
688 if (target_data_len < sizeof(struct pn533_target_type_a))
689 return false;
690
691 /*
692 * The length check of nfcid[] and ats[] are not being performed because
693 * the values are not being used
694 */
695
696 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
697 ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
698 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
699
700 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
701 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
702 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
703 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
704 return false;
705
706 /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
707 if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
708 return false;
709
710 if (type_a->nfcid_len > NFC_NFCID1_MAXSIZE)
711 return false;
712
713 return true;
714 }
715
pn533_target_found_type_a(struct nfc_target * nfc_tgt,u8 * tgt_data,int tgt_data_len)716 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
717 int tgt_data_len)
718 {
719 struct pn533_target_type_a *tgt_type_a;
720
721 tgt_type_a = (struct pn533_target_type_a *)tgt_data;
722
723 if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
724 return -EPROTO;
725
726 switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
727 case PN533_TYPE_A_SEL_PROT_MIFARE:
728 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
729 break;
730 case PN533_TYPE_A_SEL_PROT_ISO14443:
731 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
732 break;
733 case PN533_TYPE_A_SEL_PROT_DEP:
734 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
735 break;
736 case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
737 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
738 NFC_PROTO_NFC_DEP_MASK;
739 break;
740 }
741
742 nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
743 nfc_tgt->sel_res = tgt_type_a->sel_res;
744 nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
745 memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
746
747 return 0;
748 }
749
750 struct pn533_target_felica {
751 u8 pol_res;
752 struct_group(sensf_res,
753 u8 opcode;
754 u8 nfcid2[NFC_NFCID2_MAXSIZE];
755 );
756 u8 pad[8];
757 /* optional */
758 u8 syst_code[];
759 } __packed;
760
761 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
762 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
763
pn533_target_felica_is_valid(struct pn533_target_felica * felica,int target_data_len)764 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
765 int target_data_len)
766 {
767 if (target_data_len < sizeof(struct pn533_target_felica))
768 return false;
769
770 if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
771 return false;
772
773 return true;
774 }
775
pn533_target_found_felica(struct nfc_target * nfc_tgt,u8 * tgt_data,int tgt_data_len)776 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
777 int tgt_data_len)
778 {
779 struct pn533_target_felica *tgt_felica;
780
781 tgt_felica = (struct pn533_target_felica *)tgt_data;
782
783 if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
784 return -EPROTO;
785
786 if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
787 (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
788 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
789 else
790 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
791
792 memcpy(nfc_tgt->sensf_res, &tgt_felica->sensf_res, sizeof(tgt_felica->sensf_res));
793 nfc_tgt->sensf_res_len = sizeof(tgt_felica->sensf_res);
794
795 memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
796 nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
797
798 return 0;
799 }
800
801 struct pn533_target_jewel {
802 __be16 sens_res;
803 u8 jewelid[4];
804 } __packed;
805
pn533_target_jewel_is_valid(struct pn533_target_jewel * jewel,int target_data_len)806 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
807 int target_data_len)
808 {
809 u8 ssd;
810 u8 platconf;
811
812 if (target_data_len < sizeof(struct pn533_target_jewel))
813 return false;
814
815 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
816 ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
817 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
818
819 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
820 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
821 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
822 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
823 return false;
824
825 return true;
826 }
827
pn533_target_found_jewel(struct nfc_target * nfc_tgt,u8 * tgt_data,int tgt_data_len)828 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
829 int tgt_data_len)
830 {
831 struct pn533_target_jewel *tgt_jewel;
832
833 tgt_jewel = (struct pn533_target_jewel *)tgt_data;
834
835 if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
836 return -EPROTO;
837
838 nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
839 nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
840 nfc_tgt->nfcid1_len = 4;
841 memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
842
843 return 0;
844 }
845
846 struct pn533_type_b_prot_info {
847 u8 bitrate;
848 u8 fsci_type;
849 u8 fwi_adc_fo;
850 } __packed;
851
852 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
853 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
854 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
855
856 struct pn533_type_b_sens_res {
857 u8 opcode;
858 u8 nfcid[4];
859 u8 appdata[4];
860 struct pn533_type_b_prot_info prot_info;
861 } __packed;
862
863 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
864
865 struct pn533_target_type_b {
866 struct pn533_type_b_sens_res sensb_res;
867 u8 attrib_res_len;
868 u8 attrib_res[];
869 } __packed;
870
pn533_target_type_b_is_valid(struct pn533_target_type_b * type_b,int target_data_len)871 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
872 int target_data_len)
873 {
874 if (target_data_len < sizeof(struct pn533_target_type_b))
875 return false;
876
877 if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
878 return false;
879
880 if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
881 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
882 return false;
883
884 return true;
885 }
886
pn533_target_found_type_b(struct nfc_target * nfc_tgt,u8 * tgt_data,int tgt_data_len)887 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
888 int tgt_data_len)
889 {
890 struct pn533_target_type_b *tgt_type_b;
891
892 tgt_type_b = (struct pn533_target_type_b *)tgt_data;
893
894 if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
895 return -EPROTO;
896
897 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
898
899 return 0;
900 }
901
902 static void pn533_poll_reset_mod_list(struct pn533 *dev);
pn533_target_found(struct pn533 * dev,u8 tg,u8 * tgdata,int tgdata_len)903 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
904 int tgdata_len)
905 {
906 struct nfc_target nfc_tgt;
907 int rc;
908
909 dev_dbg(dev->dev, "%s: modulation=%d\n",
910 __func__, dev->poll_mod_curr);
911
912 if (tg != 1)
913 return -EPROTO;
914
915 memset(&nfc_tgt, 0, sizeof(struct nfc_target));
916
917 switch (dev->poll_mod_curr) {
918 case PN533_POLL_MOD_106KBPS_A:
919 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
920 break;
921 case PN533_POLL_MOD_212KBPS_FELICA:
922 case PN533_POLL_MOD_424KBPS_FELICA:
923 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
924 break;
925 case PN533_POLL_MOD_106KBPS_JEWEL:
926 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
927 break;
928 case PN533_POLL_MOD_847KBPS_B:
929 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
930 break;
931 default:
932 nfc_err(dev->dev,
933 "Unknown current poll modulation\n");
934 return -EPROTO;
935 }
936
937 if (rc)
938 return rc;
939
940 if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
941 dev_dbg(dev->dev,
942 "The Tg found doesn't have the desired protocol\n");
943 return -EAGAIN;
944 }
945
946 dev_dbg(dev->dev,
947 "Target found - supported protocols: 0x%x\n",
948 nfc_tgt.supported_protocols);
949
950 dev->tgt_available_prots = nfc_tgt.supported_protocols;
951
952 pn533_poll_reset_mod_list(dev);
953 nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
954
955 return 0;
956 }
957
pn533_poll_next_mod(struct pn533 * dev)958 static inline void pn533_poll_next_mod(struct pn533 *dev)
959 {
960 dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
961 }
962
pn533_poll_reset_mod_list(struct pn533 * dev)963 static void pn533_poll_reset_mod_list(struct pn533 *dev)
964 {
965 dev->poll_mod_count = 0;
966 }
967
pn533_poll_add_mod(struct pn533 * dev,u8 mod_index)968 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
969 {
970 dev->poll_mod_active[dev->poll_mod_count] =
971 (struct pn533_poll_modulations *)&poll_mod[mod_index];
972 dev->poll_mod_count++;
973 }
974
pn533_poll_create_mod_list(struct pn533 * dev,u32 im_protocols,u32 tm_protocols)975 static void pn533_poll_create_mod_list(struct pn533 *dev,
976 u32 im_protocols, u32 tm_protocols)
977 {
978 pn533_poll_reset_mod_list(dev);
979
980 if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
981 (im_protocols & NFC_PROTO_ISO14443_MASK) ||
982 (im_protocols & NFC_PROTO_NFC_DEP_MASK))
983 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
984
985 if (im_protocols & NFC_PROTO_FELICA_MASK ||
986 im_protocols & NFC_PROTO_NFC_DEP_MASK) {
987 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
988 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
989 }
990
991 if (im_protocols & NFC_PROTO_JEWEL_MASK)
992 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
993
994 if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
995 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
996
997 if (tm_protocols)
998 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
999 }
1000
pn533_start_poll_complete(struct pn533 * dev,struct sk_buff * resp)1001 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
1002 {
1003 u8 nbtg, tg, *tgdata;
1004 int rc, tgdata_len;
1005
1006 /* Toggle the DEP polling */
1007 if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK)
1008 dev->poll_dep = 1;
1009
1010 nbtg = resp->data[0];
1011 tg = resp->data[1];
1012 tgdata = &resp->data[2];
1013 tgdata_len = resp->len - 2; /* nbtg + tg */
1014
1015 if (nbtg) {
1016 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1017
1018 /* We must stop the poll after a valid target found */
1019 if (rc == 0)
1020 return 0;
1021 }
1022
1023 return -EAGAIN;
1024 }
1025
pn533_alloc_poll_tg_frame(struct pn533 * dev)1026 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1027 {
1028 struct sk_buff *skb;
1029 u8 *felica, *nfcid3;
1030
1031 u8 *gbytes = dev->gb;
1032 size_t gbytes_len = dev->gb_len;
1033
1034 u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1035 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1036 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1037 0xff, 0xff}; /* System code */
1038
1039 u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1040 0x0, 0x0, 0x0,
1041 0x40}; /* SEL_RES for DEP */
1042
1043 unsigned int skb_len = 36 + /*
1044 * mode (1), mifare (6),
1045 * felica (18), nfcid3 (10), gb_len (1)
1046 */
1047 gbytes_len +
1048 1; /* len Tk*/
1049
1050 skb = pn533_alloc_skb(dev, skb_len);
1051 if (!skb)
1052 return NULL;
1053
1054 /* DEP support only */
1055 skb_put_u8(skb, PN533_INIT_TARGET_DEP);
1056
1057 /* MIFARE params */
1058 skb_put_data(skb, mifare_params, 6);
1059
1060 /* Felica params */
1061 felica = skb_put_data(skb, felica_params, 18);
1062 get_random_bytes(felica + 2, 6);
1063
1064 /* NFCID3 */
1065 nfcid3 = skb_put_zero(skb, 10);
1066 memcpy(nfcid3, felica, 8);
1067
1068 /* General bytes */
1069 skb_put_u8(skb, gbytes_len);
1070
1071 skb_put_data(skb, gbytes, gbytes_len);
1072
1073 /* Len Tk */
1074 skb_put_u8(skb, 0);
1075
1076 return skb;
1077 }
1078
1079 static void pn533_wq_tm_mi_recv(struct work_struct *work);
1080 static struct sk_buff *pn533_build_response(struct pn533 *dev);
1081
pn533_tm_get_data_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1082 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1083 struct sk_buff *resp)
1084 {
1085 struct sk_buff *skb;
1086 u8 status, ret, mi;
1087 int rc;
1088
1089 if (IS_ERR(resp)) {
1090 skb_queue_purge(&dev->resp_q);
1091 return PTR_ERR(resp);
1092 }
1093
1094 status = resp->data[0];
1095
1096 ret = status & PN533_CMD_RET_MASK;
1097 mi = status & PN533_CMD_MI_MASK;
1098
1099 skb_pull(resp, sizeof(status));
1100
1101 if (ret != PN533_CMD_RET_SUCCESS) {
1102 rc = -EIO;
1103 goto error;
1104 }
1105
1106 skb_queue_tail(&dev->resp_q, resp);
1107
1108 if (mi) {
1109 queue_work(dev->wq, &dev->mi_tm_rx_work);
1110 return -EINPROGRESS;
1111 }
1112
1113 skb = pn533_build_response(dev);
1114 if (!skb) {
1115 rc = -EIO;
1116 goto error;
1117 }
1118
1119 return nfc_tm_data_received(dev->nfc_dev, skb);
1120
1121 error:
1122 nfc_tm_deactivated(dev->nfc_dev);
1123 dev->tgt_mode = 0;
1124 skb_queue_purge(&dev->resp_q);
1125 dev_kfree_skb(resp);
1126
1127 return rc;
1128 }
1129
pn533_wq_tm_mi_recv(struct work_struct * work)1130 static void pn533_wq_tm_mi_recv(struct work_struct *work)
1131 {
1132 struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work);
1133 struct sk_buff *skb;
1134 int rc;
1135
1136 skb = pn533_alloc_skb(dev, 0);
1137 if (!skb)
1138 return;
1139
1140 rc = pn533_send_cmd_direct_async(dev,
1141 PN533_CMD_TG_GET_DATA,
1142 skb,
1143 pn533_tm_get_data_complete,
1144 NULL);
1145
1146 if (rc < 0)
1147 dev_kfree_skb(skb);
1148 }
1149
1150 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
1151 struct sk_buff *resp);
pn533_wq_tm_mi_send(struct work_struct * work)1152 static void pn533_wq_tm_mi_send(struct work_struct *work)
1153 {
1154 struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
1155 struct sk_buff *skb;
1156 int rc;
1157
1158 /* Grab the first skb in the queue */
1159 skb = skb_dequeue(&dev->fragment_skb);
1160 if (skb == NULL) { /* No more data */
1161 /* Reset the queue for future use */
1162 skb_queue_head_init(&dev->fragment_skb);
1163 goto error;
1164 }
1165
1166 /* last entry - remove MI bit */
1167 if (skb_queue_len(&dev->fragment_skb) == 0) {
1168 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
1169 skb, pn533_tm_send_complete, NULL);
1170 } else
1171 rc = pn533_send_cmd_direct_async(dev,
1172 PN533_CMD_TG_SET_META_DATA,
1173 skb, pn533_tm_send_complete, NULL);
1174
1175 if (rc == 0) /* success */
1176 return;
1177
1178 dev_err(dev->dev,
1179 "Error %d when trying to perform set meta data_exchange", rc);
1180
1181 dev_kfree_skb(skb);
1182
1183 error:
1184 dev->phy_ops->send_ack(dev, GFP_KERNEL);
1185 queue_work(dev->wq, &dev->cmd_work);
1186 }
1187
pn533_wq_tg_get_data(struct work_struct * work)1188 static void pn533_wq_tg_get_data(struct work_struct *work)
1189 {
1190 struct pn533 *dev = container_of(work, struct pn533, tg_work);
1191 struct sk_buff *skb;
1192 int rc;
1193
1194 skb = pn533_alloc_skb(dev, 0);
1195 if (!skb)
1196 return;
1197
1198 rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1199 pn533_tm_get_data_complete, NULL);
1200
1201 if (rc < 0)
1202 dev_kfree_skb(skb);
1203 }
1204
1205 #define ATR_REQ_GB_OFFSET 17
pn533_init_target_complete(struct pn533 * dev,struct sk_buff * resp)1206 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1207 {
1208 u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1209 size_t gb_len;
1210 int rc;
1211
1212 if (resp->len < ATR_REQ_GB_OFFSET + 1)
1213 return -EINVAL;
1214
1215 mode = resp->data[0];
1216 cmd = &resp->data[1];
1217
1218 dev_dbg(dev->dev, "Target mode 0x%x len %d\n",
1219 mode, resp->len);
1220
1221 if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1222 PN533_INIT_TARGET_RESP_ACTIVE)
1223 comm_mode = NFC_COMM_ACTIVE;
1224
1225 if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0) /* Only DEP supported */
1226 return -EOPNOTSUPP;
1227
1228 gb = cmd + ATR_REQ_GB_OFFSET;
1229 gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1230
1231 rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1232 comm_mode, gb, gb_len);
1233 if (rc < 0) {
1234 nfc_err(dev->dev,
1235 "Error when signaling target activation\n");
1236 return rc;
1237 }
1238
1239 dev->tgt_mode = 1;
1240 queue_work(dev->wq, &dev->tg_work);
1241
1242 return 0;
1243 }
1244
pn533_listen_mode_timer(struct timer_list * t)1245 static void pn533_listen_mode_timer(struct timer_list *t)
1246 {
1247 struct pn533 *dev = timer_container_of(dev, t, listen_timer);
1248
1249 dev->cancel_listen = 1;
1250
1251 pn533_poll_next_mod(dev);
1252
1253 queue_delayed_work(dev->wq, &dev->poll_work,
1254 msecs_to_jiffies(PN533_POLL_INTERVAL));
1255 }
1256
pn533_rf_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1257 static int pn533_rf_complete(struct pn533 *dev, void *arg,
1258 struct sk_buff *resp)
1259 {
1260 int rc = 0;
1261
1262 if (IS_ERR(resp)) {
1263 rc = PTR_ERR(resp);
1264
1265 nfc_err(dev->dev, "RF setting error %d\n", rc);
1266
1267 return rc;
1268 }
1269
1270 queue_delayed_work(dev->wq, &dev->poll_work,
1271 msecs_to_jiffies(PN533_POLL_INTERVAL));
1272
1273 dev_kfree_skb(resp);
1274 return rc;
1275 }
1276
pn533_wq_rf(struct work_struct * work)1277 static void pn533_wq_rf(struct work_struct *work)
1278 {
1279 struct pn533 *dev = container_of(work, struct pn533, rf_work);
1280 struct sk_buff *skb;
1281 int rc;
1282
1283 skb = pn533_alloc_skb(dev, 2);
1284 if (!skb)
1285 return;
1286
1287 skb_put_u8(skb, PN533_CFGITEM_RF_FIELD);
1288 skb_put_u8(skb, PN533_CFGITEM_RF_FIELD_AUTO_RFCA);
1289
1290 rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1291 pn533_rf_complete, NULL);
1292 if (rc < 0) {
1293 dev_kfree_skb(skb);
1294 nfc_err(dev->dev, "RF setting error %d\n", rc);
1295 }
1296 }
1297
pn533_poll_dep_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1298 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg,
1299 struct sk_buff *resp)
1300 {
1301 struct pn533_cmd_jump_dep_response *rsp;
1302 struct nfc_target nfc_target;
1303 u8 target_gt_len;
1304 int rc;
1305
1306 if (IS_ERR(resp))
1307 return PTR_ERR(resp);
1308
1309 memset(&nfc_target, 0, sizeof(struct nfc_target));
1310
1311 rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1312
1313 rc = rsp->status & PN533_CMD_RET_MASK;
1314 if (rc != PN533_CMD_RET_SUCCESS) {
1315 /* Not target found, turn radio off */
1316 queue_work(dev->wq, &dev->rf_work);
1317
1318 dev_kfree_skb(resp);
1319 return 0;
1320 }
1321
1322 dev_dbg(dev->dev, "Creating new target");
1323
1324 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1325 nfc_target.nfcid1_len = 10;
1326 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1327 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1328 if (rc)
1329 goto error;
1330
1331 dev->tgt_available_prots = 0;
1332 dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1333
1334 /* ATR_RES general bytes are located at offset 17 */
1335 target_gt_len = resp->len - 17;
1336 rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1337 rsp->gt, target_gt_len);
1338 if (!rc) {
1339 rc = nfc_dep_link_is_up(dev->nfc_dev,
1340 dev->nfc_dev->targets[0].idx,
1341 0, NFC_RF_INITIATOR);
1342
1343 if (!rc)
1344 pn533_poll_reset_mod_list(dev);
1345 }
1346 error:
1347 dev_kfree_skb(resp);
1348 return rc;
1349 }
1350
1351 #define PASSIVE_DATA_LEN 5
pn533_poll_dep(struct nfc_dev * nfc_dev)1352 static int pn533_poll_dep(struct nfc_dev *nfc_dev)
1353 {
1354 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1355 struct sk_buff *skb;
1356 int rc, skb_len;
1357 u8 *next, nfcid3[NFC_NFCID3_MAXSIZE];
1358 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1359
1360 if (!dev->gb_len) {
1361 nfc_get_local_general_bytes(nfc_dev, dev->gb,
1362 sizeof(dev->gb),
1363 &dev->gb_len);
1364 if (!dev->gb_len) {
1365 dev->poll_dep = 0;
1366 queue_work(dev->wq, &dev->rf_work);
1367 }
1368 }
1369
1370 skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1371 skb_len += PASSIVE_DATA_LEN;
1372
1373 /* NFCID3 */
1374 skb_len += NFC_NFCID3_MAXSIZE;
1375 nfcid3[0] = 0x1;
1376 nfcid3[1] = 0xfe;
1377 get_random_bytes(nfcid3 + 2, 6);
1378
1379 skb = pn533_alloc_skb(dev, skb_len);
1380 if (!skb)
1381 return -ENOMEM;
1382
1383 skb_put_u8(skb, 0x01); /* Active */
1384 skb_put_u8(skb, 0x02); /* 424 kbps */
1385
1386 next = skb_put(skb, 1); /* Next */
1387 *next = 0;
1388
1389 /* Copy passive data */
1390 skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
1391 *next |= 1;
1392
1393 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1394 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
1395 *next |= 2;
1396
1397 skb_put_data(skb, dev->gb, dev->gb_len);
1398 *next |= 4; /* We have some Gi */
1399
1400 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1401 pn533_poll_dep_complete, NULL);
1402
1403 if (rc < 0)
1404 dev_kfree_skb(skb);
1405
1406 return rc;
1407 }
1408
pn533_autopoll_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1409 static int pn533_autopoll_complete(struct pn533 *dev, void *arg,
1410 struct sk_buff *resp)
1411 {
1412 struct pn532_autopoll_resp *apr;
1413 struct nfc_target nfc_tgt;
1414 u8 nbtg;
1415 int rc;
1416
1417 if (IS_ERR(resp)) {
1418 rc = PTR_ERR(resp);
1419
1420 nfc_err(dev->dev, "%s autopoll complete error %d\n",
1421 __func__, rc);
1422
1423 if (rc == -ENOENT) {
1424 if (dev->poll_mod_count != 0)
1425 return rc;
1426 goto stop_poll;
1427 }
1428 nfc_err(dev->dev, "Error %d when running autopoll\n", rc);
1429 goto stop_poll;
1430 }
1431
1432 nbtg = resp->data[0];
1433 if ((nbtg > 2) || (nbtg <= 0))
1434 return -EAGAIN;
1435
1436 apr = (struct pn532_autopoll_resp *)&resp->data[1];
1437 while (nbtg--) {
1438 memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1439 switch (apr->type) {
1440 case PN532_AUTOPOLL_TYPE_ISOA:
1441 dev_dbg(dev->dev, "ISOA\n");
1442 rc = pn533_target_found_type_a(&nfc_tgt, apr->tgdata,
1443 apr->ln - 1);
1444 break;
1445 case PN532_AUTOPOLL_TYPE_FELICA212:
1446 case PN532_AUTOPOLL_TYPE_FELICA424:
1447 dev_dbg(dev->dev, "FELICA\n");
1448 rc = pn533_target_found_felica(&nfc_tgt, apr->tgdata,
1449 apr->ln - 1);
1450 break;
1451 case PN532_AUTOPOLL_TYPE_JEWEL:
1452 dev_dbg(dev->dev, "JEWEL\n");
1453 rc = pn533_target_found_jewel(&nfc_tgt, apr->tgdata,
1454 apr->ln - 1);
1455 break;
1456 case PN532_AUTOPOLL_TYPE_ISOB:
1457 dev_dbg(dev->dev, "ISOB\n");
1458 rc = pn533_target_found_type_b(&nfc_tgt, apr->tgdata,
1459 apr->ln - 1);
1460 break;
1461 case PN532_AUTOPOLL_TYPE_MIFARE:
1462 dev_dbg(dev->dev, "Mifare\n");
1463 rc = pn533_target_found_type_a(&nfc_tgt, apr->tgdata,
1464 apr->ln - 1);
1465 break;
1466 default:
1467 nfc_err(dev->dev,
1468 "Unknown current poll modulation\n");
1469 rc = -EPROTO;
1470 }
1471
1472 if (rc)
1473 goto done;
1474
1475 if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1476 nfc_err(dev->dev,
1477 "The Tg found doesn't have the desired protocol\n");
1478 rc = -EAGAIN;
1479 goto done;
1480 }
1481
1482 dev->tgt_available_prots = nfc_tgt.supported_protocols;
1483 apr = (struct pn532_autopoll_resp *)
1484 (apr->tgdata + (apr->ln - 1));
1485 }
1486
1487 pn533_poll_reset_mod_list(dev);
1488 nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1489
1490 done:
1491 dev_kfree_skb(resp);
1492 return rc;
1493
1494 stop_poll:
1495 nfc_err(dev->dev, "autopoll operation has been stopped\n");
1496
1497 pn533_poll_reset_mod_list(dev);
1498 dev->poll_protocols = 0;
1499 return rc;
1500 }
1501
pn533_poll_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1502 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1503 struct sk_buff *resp)
1504 {
1505 struct pn533_poll_modulations *cur_mod;
1506 int rc;
1507
1508 if (IS_ERR(resp)) {
1509 rc = PTR_ERR(resp);
1510
1511 nfc_err(dev->dev, "%s Poll complete error %d\n",
1512 __func__, rc);
1513
1514 if (rc == -ENOENT) {
1515 if (dev->poll_mod_count != 0)
1516 return rc;
1517 goto stop_poll;
1518 }
1519 nfc_err(dev->dev, "Error %d when running poll\n", rc);
1520 goto stop_poll;
1521 }
1522
1523 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1524
1525 if (cur_mod->len == 0) { /* Target mode */
1526 timer_delete(&dev->listen_timer);
1527 rc = pn533_init_target_complete(dev, resp);
1528 goto done;
1529 }
1530
1531 /* Initiator mode */
1532 rc = pn533_start_poll_complete(dev, resp);
1533 if (!rc)
1534 goto done;
1535
1536 if (!dev->poll_mod_count) {
1537 dev_dbg(dev->dev, "Polling has been stopped\n");
1538 goto done;
1539 }
1540
1541 pn533_poll_next_mod(dev);
1542 /* Not target found, turn radio off */
1543 queue_work(dev->wq, &dev->rf_work);
1544
1545 done:
1546 dev_kfree_skb(resp);
1547 return rc;
1548
1549 stop_poll:
1550 nfc_err(dev->dev, "Polling operation has been stopped\n");
1551
1552 pn533_poll_reset_mod_list(dev);
1553 dev->poll_protocols = 0;
1554 return rc;
1555 }
1556
pn533_alloc_poll_in_frame(struct pn533 * dev,struct pn533_poll_modulations * mod)1557 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1558 struct pn533_poll_modulations *mod)
1559 {
1560 struct sk_buff *skb;
1561
1562 skb = pn533_alloc_skb(dev, mod->len);
1563 if (!skb)
1564 return NULL;
1565
1566 skb_put_data(skb, &mod->data, mod->len);
1567
1568 return skb;
1569 }
1570
pn533_send_poll_frame(struct pn533 * dev)1571 static int pn533_send_poll_frame(struct pn533 *dev)
1572 {
1573 struct pn533_poll_modulations *mod;
1574 struct sk_buff *skb;
1575 int rc;
1576 u8 cmd_code;
1577
1578 mod = dev->poll_mod_active[dev->poll_mod_curr];
1579
1580 dev_dbg(dev->dev, "%s mod len %d\n",
1581 __func__, mod->len);
1582
1583 if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep) {
1584 dev->poll_dep = 0;
1585 return pn533_poll_dep(dev->nfc_dev);
1586 }
1587
1588 if (mod->len == 0) { /* Listen mode */
1589 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1590 skb = pn533_alloc_poll_tg_frame(dev);
1591 } else { /* Polling mode */
1592 cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET;
1593 skb = pn533_alloc_poll_in_frame(dev, mod);
1594 }
1595
1596 if (!skb) {
1597 nfc_err(dev->dev, "Failed to allocate skb\n");
1598 return -ENOMEM;
1599 }
1600
1601 rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1602 NULL);
1603 if (rc < 0) {
1604 dev_kfree_skb(skb);
1605 nfc_err(dev->dev, "Polling loop error %d\n", rc);
1606 }
1607
1608 return rc;
1609 }
1610
pn533_wq_poll(struct work_struct * work)1611 static void pn533_wq_poll(struct work_struct *work)
1612 {
1613 struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1614 struct pn533_poll_modulations *cur_mod;
1615 int rc;
1616
1617 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1618
1619 dev_dbg(dev->dev,
1620 "%s cancel_listen %d modulation len %d\n",
1621 __func__, dev->cancel_listen, cur_mod->len);
1622
1623 if (dev->cancel_listen == 1) {
1624 dev->cancel_listen = 0;
1625 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC);
1626 }
1627
1628 rc = pn533_send_poll_frame(dev);
1629 if (rc)
1630 return;
1631
1632 if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1633 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1634 }
1635
pn533_start_poll(struct nfc_dev * nfc_dev,u32 im_protocols,u32 tm_protocols)1636 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1637 u32 im_protocols, u32 tm_protocols)
1638 {
1639 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1640 struct pn533_poll_modulations *cur_mod;
1641 struct sk_buff *skb;
1642 u8 rand_mod;
1643 int rc;
1644
1645 dev_dbg(dev->dev,
1646 "%s: im protocols 0x%x tm protocols 0x%x\n",
1647 __func__, im_protocols, tm_protocols);
1648
1649 if (dev->tgt_active_prot) {
1650 nfc_err(dev->dev,
1651 "Cannot poll with a target already activated\n");
1652 return -EBUSY;
1653 }
1654
1655 if (dev->tgt_mode) {
1656 nfc_err(dev->dev,
1657 "Cannot poll while already being activated\n");
1658 return -EBUSY;
1659 }
1660
1661 if (tm_protocols) {
1662 nfc_get_local_general_bytes(nfc_dev, dev->gb,
1663 sizeof(dev->gb), &dev->gb_len);
1664 if (dev->gb_len == 0)
1665 tm_protocols = 0;
1666 }
1667
1668 dev->poll_protocols = im_protocols;
1669 dev->listen_protocols = tm_protocols;
1670 if (dev->device_type == PN533_DEVICE_PN532_AUTOPOLL) {
1671 skb = pn533_alloc_skb(dev, 4 + 6);
1672 if (!skb)
1673 return -ENOMEM;
1674
1675 *((u8 *)skb_put(skb, sizeof(u8))) =
1676 PN532_AUTOPOLL_POLLNR_INFINITE;
1677 *((u8 *)skb_put(skb, sizeof(u8))) = PN532_AUTOPOLL_PERIOD;
1678
1679 if ((im_protocols & NFC_PROTO_MIFARE_MASK) &&
1680 (im_protocols & NFC_PROTO_ISO14443_MASK) &&
1681 (im_protocols & NFC_PROTO_NFC_DEP_MASK))
1682 *((u8 *)skb_put(skb, sizeof(u8))) =
1683 PN532_AUTOPOLL_TYPE_GENERIC_106;
1684 else {
1685 if (im_protocols & NFC_PROTO_MIFARE_MASK)
1686 *((u8 *)skb_put(skb, sizeof(u8))) =
1687 PN532_AUTOPOLL_TYPE_MIFARE;
1688
1689 if (im_protocols & NFC_PROTO_ISO14443_MASK)
1690 *((u8 *)skb_put(skb, sizeof(u8))) =
1691 PN532_AUTOPOLL_TYPE_ISOA;
1692
1693 if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1694 *((u8 *)skb_put(skb, sizeof(u8))) =
1695 PN532_AUTOPOLL_TYPE_DEP_PASSIVE_106;
1696 *((u8 *)skb_put(skb, sizeof(u8))) =
1697 PN532_AUTOPOLL_TYPE_DEP_PASSIVE_212;
1698 *((u8 *)skb_put(skb, sizeof(u8))) =
1699 PN532_AUTOPOLL_TYPE_DEP_PASSIVE_424;
1700 }
1701 }
1702
1703 if (im_protocols & NFC_PROTO_FELICA_MASK ||
1704 im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1705 *((u8 *)skb_put(skb, sizeof(u8))) =
1706 PN532_AUTOPOLL_TYPE_FELICA212;
1707 *((u8 *)skb_put(skb, sizeof(u8))) =
1708 PN532_AUTOPOLL_TYPE_FELICA424;
1709 }
1710
1711 if (im_protocols & NFC_PROTO_JEWEL_MASK)
1712 *((u8 *)skb_put(skb, sizeof(u8))) =
1713 PN532_AUTOPOLL_TYPE_JEWEL;
1714
1715 if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1716 *((u8 *)skb_put(skb, sizeof(u8))) =
1717 PN532_AUTOPOLL_TYPE_ISOB;
1718
1719 if (tm_protocols)
1720 *((u8 *)skb_put(skb, sizeof(u8))) =
1721 PN532_AUTOPOLL_TYPE_DEP_ACTIVE_106;
1722
1723 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_AUTOPOLL, skb,
1724 pn533_autopoll_complete, NULL);
1725
1726 if (rc < 0)
1727 dev_kfree_skb(skb);
1728 else
1729 dev->poll_mod_count++;
1730
1731 return rc;
1732 }
1733
1734 pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1735 if (!dev->poll_mod_count) {
1736 nfc_err(dev->dev,
1737 "Poll mod list is empty\n");
1738 return -EINVAL;
1739 }
1740
1741 /* Do not always start polling from the same modulation */
1742 get_random_bytes(&rand_mod, sizeof(rand_mod));
1743 rand_mod %= dev->poll_mod_count;
1744 dev->poll_mod_curr = rand_mod;
1745
1746 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1747
1748 rc = pn533_send_poll_frame(dev);
1749
1750 /* Start listen timer */
1751 if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
1752 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1753
1754 return rc;
1755 }
1756
pn533_stop_poll(struct nfc_dev * nfc_dev)1757 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1758 {
1759 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1760
1761 timer_delete(&dev->listen_timer);
1762
1763 if (!dev->poll_mod_count) {
1764 dev_dbg(dev->dev,
1765 "Polling operation was not running\n");
1766 return;
1767 }
1768
1769 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1770 flush_delayed_work(&dev->poll_work);
1771 pn533_poll_reset_mod_list(dev);
1772 }
1773
pn533_activate_target_nfcdep(struct pn533 * dev)1774 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1775 {
1776 struct pn533_cmd_activate_response *rsp;
1777 u16 gt_len;
1778 int rc;
1779 struct sk_buff *skb;
1780 struct sk_buff *resp;
1781
1782 skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1783 if (!skb)
1784 return -ENOMEM;
1785
1786 skb_put_u8(skb, 1); /* TG */
1787 skb_put_u8(skb, 0); /* Next */
1788
1789 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1790 if (IS_ERR(resp))
1791 return PTR_ERR(resp);
1792
1793 rsp = (struct pn533_cmd_activate_response *)resp->data;
1794 rc = rsp->status & PN533_CMD_RET_MASK;
1795 if (rc != PN533_CMD_RET_SUCCESS) {
1796 nfc_err(dev->dev,
1797 "Target activation failed (error 0x%x)\n", rc);
1798 dev_kfree_skb(resp);
1799 return -EIO;
1800 }
1801
1802 /* ATR_RES general bytes are located at offset 16 */
1803 gt_len = resp->len - 16;
1804 rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1805
1806 dev_kfree_skb(resp);
1807 return rc;
1808 }
1809
pn533_activate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,u32 protocol)1810 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1811 struct nfc_target *target, u32 protocol)
1812 {
1813 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1814 int rc;
1815
1816 dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol);
1817
1818 if (dev->poll_mod_count) {
1819 nfc_err(dev->dev,
1820 "Cannot activate while polling\n");
1821 return -EBUSY;
1822 }
1823
1824 if (dev->tgt_active_prot) {
1825 nfc_err(dev->dev,
1826 "There is already an active target\n");
1827 return -EBUSY;
1828 }
1829
1830 if (!dev->tgt_available_prots) {
1831 nfc_err(dev->dev,
1832 "There is no available target to activate\n");
1833 return -EINVAL;
1834 }
1835
1836 if (!(dev->tgt_available_prots & (1 << protocol))) {
1837 nfc_err(dev->dev,
1838 "Target doesn't support requested proto %u\n",
1839 protocol);
1840 return -EINVAL;
1841 }
1842
1843 if (protocol == NFC_PROTO_NFC_DEP) {
1844 rc = pn533_activate_target_nfcdep(dev);
1845 if (rc) {
1846 nfc_err(dev->dev,
1847 "Activating target with DEP failed %d\n", rc);
1848 return rc;
1849 }
1850 }
1851
1852 dev->tgt_active_prot = protocol;
1853 dev->tgt_available_prots = 0;
1854
1855 return 0;
1856 }
1857
pn533_deactivate_target_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1858 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg,
1859 struct sk_buff *resp)
1860 {
1861 int rc = 0;
1862
1863 if (IS_ERR(resp)) {
1864 rc = PTR_ERR(resp);
1865
1866 nfc_err(dev->dev, "Target release error %d\n", rc);
1867
1868 return rc;
1869 }
1870
1871 rc = resp->data[0] & PN533_CMD_RET_MASK;
1872 if (rc != PN533_CMD_RET_SUCCESS)
1873 nfc_err(dev->dev,
1874 "Error 0x%x when releasing the target\n", rc);
1875
1876 dev_kfree_skb(resp);
1877 return rc;
1878 }
1879
pn533_deactivate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,u8 mode)1880 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1881 struct nfc_target *target, u8 mode)
1882 {
1883 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1884 struct sk_buff *skb;
1885 int rc;
1886
1887 if (!dev->tgt_active_prot) {
1888 nfc_err(dev->dev, "There is no active target\n");
1889 return;
1890 }
1891
1892 dev->tgt_active_prot = 0;
1893 skb_queue_purge(&dev->resp_q);
1894
1895 skb = pn533_alloc_skb(dev, sizeof(u8));
1896 if (!skb)
1897 return;
1898
1899 skb_put_u8(skb, 1); /* TG*/
1900
1901 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb,
1902 pn533_deactivate_target_complete, NULL);
1903 if (rc < 0) {
1904 dev_kfree_skb(skb);
1905 nfc_err(dev->dev, "Target release error %d\n", rc);
1906 }
1907 }
1908
1909
pn533_in_dep_link_up_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1910 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1911 struct sk_buff *resp)
1912 {
1913 struct pn533_cmd_jump_dep_response *rsp;
1914 u8 target_gt_len;
1915 int rc;
1916 u8 active = *(u8 *)arg;
1917
1918 kfree(arg);
1919
1920 if (IS_ERR(resp))
1921 return PTR_ERR(resp);
1922
1923 if (dev->tgt_available_prots &&
1924 !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1925 nfc_err(dev->dev,
1926 "The target does not support DEP\n");
1927 rc = -EINVAL;
1928 goto error;
1929 }
1930
1931 rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1932
1933 rc = rsp->status & PN533_CMD_RET_MASK;
1934 if (rc != PN533_CMD_RET_SUCCESS) {
1935 nfc_err(dev->dev,
1936 "Bringing DEP link up failed (error 0x%x)\n", rc);
1937 goto error;
1938 }
1939
1940 if (!dev->tgt_available_prots) {
1941 struct nfc_target nfc_target;
1942
1943 dev_dbg(dev->dev, "Creating new target\n");
1944
1945 memset(&nfc_target, 0, sizeof(struct nfc_target));
1946
1947 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1948 nfc_target.nfcid1_len = 10;
1949 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1950 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1951 if (rc)
1952 goto error;
1953
1954 dev->tgt_available_prots = 0;
1955 }
1956
1957 dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1958
1959 /* ATR_RES general bytes are located at offset 17 */
1960 target_gt_len = resp->len - 17;
1961 rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1962 rsp->gt, target_gt_len);
1963 if (rc == 0)
1964 rc = nfc_dep_link_is_up(dev->nfc_dev,
1965 dev->nfc_dev->targets[0].idx,
1966 !active, NFC_RF_INITIATOR);
1967
1968 error:
1969 dev_kfree_skb(resp);
1970 return rc;
1971 }
1972
1973 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
pn533_dep_link_up(struct nfc_dev * nfc_dev,struct nfc_target * target,u8 comm_mode,u8 * gb,size_t gb_len)1974 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1975 u8 comm_mode, u8 *gb, size_t gb_len)
1976 {
1977 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1978 struct sk_buff *skb;
1979 int rc, skb_len;
1980 u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
1981 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1982
1983 if (dev->poll_mod_count) {
1984 nfc_err(dev->dev,
1985 "Cannot bring the DEP link up while polling\n");
1986 return -EBUSY;
1987 }
1988
1989 if (dev->tgt_active_prot) {
1990 nfc_err(dev->dev,
1991 "There is already an active target\n");
1992 return -EBUSY;
1993 }
1994
1995 skb_len = 3 + gb_len; /* ActPass + BR + Next */
1996 skb_len += PASSIVE_DATA_LEN;
1997
1998 /* NFCID3 */
1999 skb_len += NFC_NFCID3_MAXSIZE;
2000 if (target && !target->nfcid2_len) {
2001 nfcid3[0] = 0x1;
2002 nfcid3[1] = 0xfe;
2003 get_random_bytes(nfcid3 + 2, 6);
2004 }
2005
2006 skb = pn533_alloc_skb(dev, skb_len);
2007 if (!skb)
2008 return -ENOMEM;
2009
2010 skb_put_u8(skb, !comm_mode); /* ActPass */
2011 skb_put_u8(skb, 0x02); /* 424 kbps */
2012
2013 next = skb_put(skb, 1); /* Next */
2014 *next = 0;
2015
2016 /* Copy passive data */
2017 skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
2018 *next |= 1;
2019
2020 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
2021 if (target && target->nfcid2_len)
2022 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
2023 target->nfcid2_len);
2024 else
2025 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
2026 *next |= 2;
2027
2028 if (gb != NULL && gb_len > 0) {
2029 skb_put_data(skb, gb, gb_len);
2030 *next |= 4; /* We have some Gi */
2031 } else {
2032 *next = 0;
2033 }
2034
2035 arg = kmalloc_obj(*arg);
2036 if (!arg) {
2037 dev_kfree_skb(skb);
2038 return -ENOMEM;
2039 }
2040
2041 *arg = !comm_mode;
2042
2043 pn533_rf_field(dev->nfc_dev, 0);
2044
2045 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
2046 pn533_in_dep_link_up_complete, arg);
2047
2048 if (rc < 0) {
2049 dev_kfree_skb(skb);
2050 kfree(arg);
2051 }
2052
2053 return rc;
2054 }
2055
pn533_dep_link_down(struct nfc_dev * nfc_dev)2056 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
2057 {
2058 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2059
2060 pn533_poll_reset_mod_list(dev);
2061
2062 if (dev->tgt_mode || dev->tgt_active_prot)
2063 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
2064
2065 dev->tgt_active_prot = 0;
2066 dev->tgt_mode = 0;
2067
2068 skb_queue_purge(&dev->resp_q);
2069
2070 return 0;
2071 }
2072
2073 struct pn533_data_exchange_arg {
2074 data_exchange_cb_t cb;
2075 void *cb_context;
2076 };
2077
pn533_build_response(struct pn533 * dev)2078 static struct sk_buff *pn533_build_response(struct pn533 *dev)
2079 {
2080 struct sk_buff *skb, *tmp, *t;
2081 unsigned int skb_len = 0, tmp_len = 0;
2082
2083 if (skb_queue_empty(&dev->resp_q))
2084 return NULL;
2085
2086 if (skb_queue_len(&dev->resp_q) == 1) {
2087 skb = skb_dequeue(&dev->resp_q);
2088 goto out;
2089 }
2090
2091 skb_queue_walk_safe(&dev->resp_q, tmp, t)
2092 skb_len += tmp->len;
2093
2094 dev_dbg(dev->dev, "%s total length %d\n",
2095 __func__, skb_len);
2096
2097 skb = alloc_skb(skb_len, GFP_KERNEL);
2098 if (skb == NULL)
2099 goto out;
2100
2101 skb_put(skb, skb_len);
2102
2103 skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2104 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2105 tmp_len += tmp->len;
2106 }
2107
2108 out:
2109 skb_queue_purge(&dev->resp_q);
2110
2111 return skb;
2112 }
2113
pn533_data_exchange_complete(struct pn533 * dev,void * _arg,struct sk_buff * resp)2114 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2115 struct sk_buff *resp)
2116 {
2117 struct pn533_data_exchange_arg *arg = _arg;
2118 struct sk_buff *skb;
2119 int rc = 0;
2120 u8 status, ret, mi;
2121
2122 if (IS_ERR(resp)) {
2123 rc = PTR_ERR(resp);
2124 goto _error;
2125 }
2126
2127 status = resp->data[0];
2128 ret = status & PN533_CMD_RET_MASK;
2129 mi = status & PN533_CMD_MI_MASK;
2130
2131 skb_pull(resp, sizeof(status));
2132
2133 if (ret != PN533_CMD_RET_SUCCESS) {
2134 nfc_err(dev->dev,
2135 "Exchanging data failed (error 0x%x)\n", ret);
2136 rc = -EIO;
2137 goto error;
2138 }
2139
2140 skb_queue_tail(&dev->resp_q, resp);
2141
2142 if (mi) {
2143 dev->cmd_complete_mi_arg = arg;
2144 queue_work(dev->wq, &dev->mi_rx_work);
2145 return -EINPROGRESS;
2146 }
2147
2148 /* Prepare for the next round */
2149 if (skb_queue_len(&dev->fragment_skb) > 0) {
2150 dev->cmd_complete_dep_arg = arg;
2151 queue_work(dev->wq, &dev->mi_tx_work);
2152
2153 return -EINPROGRESS;
2154 }
2155
2156 skb = pn533_build_response(dev);
2157 if (!skb) {
2158 rc = -ENOMEM;
2159 goto error;
2160 }
2161
2162 arg->cb(arg->cb_context, skb, 0);
2163 kfree(arg);
2164 return 0;
2165
2166 error:
2167 dev_kfree_skb(resp);
2168 _error:
2169 skb_queue_purge(&dev->resp_q);
2170 arg->cb(arg->cb_context, NULL, rc);
2171 kfree(arg);
2172 return rc;
2173 }
2174
2175 /*
2176 * Receive an incoming pn533 frame. skb contains only header and payload.
2177 * If skb == NULL, it is a notification that the link below is dead.
2178 */
pn533_recv_frame(struct pn533 * dev,struct sk_buff * skb,int status)2179 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2180 {
2181 if (!dev->cmd)
2182 goto sched_wq;
2183
2184 dev->cmd->status = status;
2185
2186 if (status != 0) {
2187 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2188 goto sched_wq;
2189 }
2190
2191 if (skb == NULL) {
2192 dev_err(dev->dev, "NULL Frame -> link is dead\n");
2193 goto sched_wq;
2194 }
2195
2196 if (pn533_rx_frame_is_ack(skb->data)) {
2197 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2198 dev_kfree_skb(skb);
2199 return;
2200 }
2201
2202 print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2203 dev->ops->rx_frame_size(skb->data), false);
2204
2205 if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2206 nfc_err(dev->dev, "Received an invalid frame\n");
2207 dev->cmd->status = -EIO;
2208 } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2209 nfc_err(dev->dev, "It it not the response to the last command\n");
2210 dev->cmd->status = -EIO;
2211 }
2212
2213 dev->cmd->resp = skb;
2214
2215 sched_wq:
2216 queue_work(dev->wq, &dev->cmd_complete_work);
2217 }
2218 EXPORT_SYMBOL(pn533_recv_frame);
2219
2220 /* Split the Tx skb into small chunks */
pn533_fill_fragment_skbs(struct pn533 * dev,struct sk_buff * skb)2221 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2222 {
2223 struct sk_buff *frag;
2224 int frag_size;
2225
2226 do {
2227 /* Remaining size */
2228 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2229 frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2230 else
2231 frag_size = skb->len;
2232
2233 /* Allocate and reserve */
2234 frag = pn533_alloc_skb(dev, frag_size);
2235 if (!frag) {
2236 skb_queue_purge(&dev->fragment_skb);
2237 return -ENOMEM;
2238 }
2239
2240 if (!dev->tgt_mode) {
2241 /* Reserve the TG/MI byte */
2242 skb_reserve(frag, 1);
2243
2244 /* MI + TG */
2245 if (frag_size == PN533_CMD_DATAFRAME_MAXLEN)
2246 *(u8 *)skb_push(frag, sizeof(u8)) =
2247 (PN533_CMD_MI_MASK | 1);
2248 else
2249 *(u8 *)skb_push(frag, sizeof(u8)) = 1; /* TG */
2250 }
2251
2252 skb_put_data(frag, skb->data, frag_size);
2253
2254 /* Reduce the size of incoming buffer */
2255 skb_pull(skb, frag_size);
2256
2257 /* Add this to skb_queue */
2258 skb_queue_tail(&dev->fragment_skb, frag);
2259
2260 } while (skb->len > 0);
2261
2262 dev_kfree_skb(skb);
2263
2264 return skb_queue_len(&dev->fragment_skb);
2265 }
2266
pn533_transceive(struct nfc_dev * nfc_dev,struct nfc_target * target,struct sk_buff * skb,data_exchange_cb_t cb,void * cb_context)2267 static int pn533_transceive(struct nfc_dev *nfc_dev,
2268 struct nfc_target *target, struct sk_buff *skb,
2269 data_exchange_cb_t cb, void *cb_context)
2270 {
2271 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2272 struct pn533_data_exchange_arg *arg = NULL;
2273 int rc;
2274
2275 if (!dev->tgt_active_prot) {
2276 nfc_err(dev->dev,
2277 "Can't exchange data if there is no active target\n");
2278 rc = -EINVAL;
2279 goto error;
2280 }
2281
2282 arg = kmalloc_obj(*arg);
2283 if (!arg) {
2284 rc = -ENOMEM;
2285 goto error;
2286 }
2287
2288 arg->cb = cb;
2289 arg->cb_context = cb_context;
2290
2291 switch (dev->device_type) {
2292 case PN533_DEVICE_PASORI:
2293 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2294 rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2295 skb,
2296 pn533_data_exchange_complete,
2297 arg);
2298
2299 break;
2300 }
2301 fallthrough;
2302 default:
2303 /* jumbo frame ? */
2304 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2305 rc = pn533_fill_fragment_skbs(dev, skb);
2306 if (rc < 0)
2307 goto error;
2308
2309 skb = skb_dequeue(&dev->fragment_skb);
2310 if (!skb) {
2311 rc = -EIO;
2312 goto error;
2313 }
2314 } else {
2315 *(u8 *)skb_push(skb, sizeof(u8)) = 1; /* TG */
2316 }
2317
2318 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2319 skb, pn533_data_exchange_complete,
2320 arg);
2321
2322 break;
2323 }
2324
2325 if (rc < 0) /* rc from send_async */
2326 goto error;
2327
2328 return 0;
2329
2330 error:
2331 kfree(arg);
2332 dev_kfree_skb(skb);
2333 return rc;
2334 }
2335
pn533_tm_send_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)2336 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2337 struct sk_buff *resp)
2338 {
2339 u8 status;
2340
2341 if (IS_ERR(resp))
2342 return PTR_ERR(resp);
2343
2344 status = resp->data[0];
2345
2346 /* Prepare for the next round */
2347 if (skb_queue_len(&dev->fragment_skb) > 0) {
2348 queue_work(dev->wq, &dev->mi_tm_tx_work);
2349 return -EINPROGRESS;
2350 }
2351 dev_kfree_skb(resp);
2352
2353 if (status != 0) {
2354 nfc_tm_deactivated(dev->nfc_dev);
2355
2356 dev->tgt_mode = 0;
2357
2358 return 0;
2359 }
2360
2361 queue_work(dev->wq, &dev->tg_work);
2362
2363 return 0;
2364 }
2365
pn533_tm_send(struct nfc_dev * nfc_dev,struct sk_buff * skb)2366 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2367 {
2368 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2369 int rc;
2370
2371 /* let's split in multiple chunks if size's too big */
2372 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2373 rc = pn533_fill_fragment_skbs(dev, skb);
2374 if (rc < 0)
2375 goto error;
2376
2377 /* get the first skb */
2378 skb = skb_dequeue(&dev->fragment_skb);
2379 if (!skb) {
2380 rc = -EIO;
2381 goto error;
2382 }
2383
2384 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2385 pn533_tm_send_complete, NULL);
2386 } else {
2387 /* Send th skb */
2388 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2389 pn533_tm_send_complete, NULL);
2390 }
2391
2392 error:
2393 if (rc < 0) {
2394 dev_kfree_skb(skb);
2395 skb_queue_purge(&dev->fragment_skb);
2396 }
2397
2398 return rc;
2399 }
2400
pn533_wq_mi_recv(struct work_struct * work)2401 static void pn533_wq_mi_recv(struct work_struct *work)
2402 {
2403 struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2404 struct sk_buff *skb;
2405 int rc;
2406
2407 skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2408 if (!skb)
2409 goto error;
2410
2411 switch (dev->device_type) {
2412 case PN533_DEVICE_PASORI:
2413 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2414 rc = pn533_send_cmd_direct_async(dev,
2415 PN533_CMD_IN_COMM_THRU,
2416 skb,
2417 pn533_data_exchange_complete,
2418 dev->cmd_complete_mi_arg);
2419
2420 break;
2421 }
2422 fallthrough;
2423 default:
2424 skb_put_u8(skb, 1); /*TG*/
2425
2426 rc = pn533_send_cmd_direct_async(dev,
2427 PN533_CMD_IN_DATA_EXCHANGE,
2428 skb,
2429 pn533_data_exchange_complete,
2430 dev->cmd_complete_mi_arg);
2431
2432 break;
2433 }
2434
2435 if (rc == 0) /* success */
2436 return;
2437
2438 nfc_err(dev->dev,
2439 "Error %d when trying to perform data_exchange\n", rc);
2440
2441 dev_kfree_skb(skb);
2442 kfree(dev->cmd_complete_mi_arg);
2443
2444 error:
2445 dev->phy_ops->send_ack(dev, GFP_KERNEL);
2446 queue_work(dev->wq, &dev->cmd_work);
2447 }
2448
pn533_wq_mi_send(struct work_struct * work)2449 static void pn533_wq_mi_send(struct work_struct *work)
2450 {
2451 struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2452 struct sk_buff *skb;
2453 int rc;
2454
2455 /* Grab the first skb in the queue */
2456 skb = skb_dequeue(&dev->fragment_skb);
2457
2458 if (skb == NULL) { /* No more data */
2459 /* Reset the queue for future use */
2460 skb_queue_head_init(&dev->fragment_skb);
2461 goto error;
2462 }
2463
2464 switch (dev->device_type) {
2465 case PN533_DEVICE_PASORI:
2466 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2467 rc = -EIO;
2468 break;
2469 }
2470
2471 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2472 skb,
2473 pn533_data_exchange_complete,
2474 dev->cmd_complete_dep_arg);
2475
2476 break;
2477
2478 default:
2479 /* Still some fragments? */
2480 rc = pn533_send_cmd_direct_async(dev,
2481 PN533_CMD_IN_DATA_EXCHANGE,
2482 skb,
2483 pn533_data_exchange_complete,
2484 dev->cmd_complete_dep_arg);
2485
2486 break;
2487 }
2488
2489 if (rc == 0) /* success */
2490 return;
2491
2492 nfc_err(dev->dev,
2493 "Error %d when trying to perform data_exchange\n", rc);
2494
2495 dev_kfree_skb(skb);
2496 kfree(dev->cmd_complete_dep_arg);
2497
2498 error:
2499 dev->phy_ops->send_ack(dev, GFP_KERNEL);
2500 queue_work(dev->wq, &dev->cmd_work);
2501 }
2502
pn533_set_configuration(struct pn533 * dev,u8 cfgitem,u8 * cfgdata,u8 cfgdata_len)2503 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2504 u8 cfgdata_len)
2505 {
2506 struct sk_buff *skb;
2507 struct sk_buff *resp;
2508 int skb_len;
2509
2510 skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2511
2512 skb = pn533_alloc_skb(dev, skb_len);
2513 if (!skb)
2514 return -ENOMEM;
2515
2516 skb_put_u8(skb, cfgitem);
2517 skb_put_data(skb, cfgdata, cfgdata_len);
2518
2519 resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2520 if (IS_ERR(resp))
2521 return PTR_ERR(resp);
2522
2523 dev_kfree_skb(resp);
2524 return 0;
2525 }
2526
pn533_get_firmware_version(struct pn533 * dev,struct pn533_fw_version * fv)2527 static int pn533_get_firmware_version(struct pn533 *dev,
2528 struct pn533_fw_version *fv)
2529 {
2530 struct sk_buff *skb;
2531 struct sk_buff *resp;
2532
2533 skb = pn533_alloc_skb(dev, 0);
2534 if (!skb)
2535 return -ENOMEM;
2536
2537 resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2538 if (IS_ERR(resp))
2539 return PTR_ERR(resp);
2540
2541 fv->ic = resp->data[0];
2542 fv->ver = resp->data[1];
2543 fv->rev = resp->data[2];
2544 fv->support = resp->data[3];
2545
2546 dev_kfree_skb(resp);
2547 return 0;
2548 }
2549
pn533_pasori_fw_reset(struct pn533 * dev)2550 static int pn533_pasori_fw_reset(struct pn533 *dev)
2551 {
2552 struct sk_buff *skb;
2553 struct sk_buff *resp;
2554
2555 skb = pn533_alloc_skb(dev, sizeof(u8));
2556 if (!skb)
2557 return -ENOMEM;
2558
2559 skb_put_u8(skb, 0x1);
2560
2561 resp = pn533_send_cmd_sync(dev, 0x18, skb);
2562 if (IS_ERR(resp))
2563 return PTR_ERR(resp);
2564
2565 dev_kfree_skb(resp);
2566
2567 return 0;
2568 }
2569
pn533_rf_field(struct nfc_dev * nfc_dev,u8 rf)2570 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2571 {
2572 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2573 u8 rf_field = !!rf;
2574 int rc;
2575
2576 rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2577
2578 rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2579 (u8 *)&rf_field, 1);
2580 if (rc) {
2581 nfc_err(dev->dev, "Error on setting RF field\n");
2582 return rc;
2583 }
2584
2585 return 0;
2586 }
2587
pn532_sam_configuration(struct nfc_dev * nfc_dev)2588 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2589 {
2590 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2591 struct sk_buff *skb;
2592 struct sk_buff *resp;
2593
2594 skb = pn533_alloc_skb(dev, 1);
2595 if (!skb)
2596 return -ENOMEM;
2597
2598 skb_put_u8(skb, 0x01);
2599
2600 resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2601 if (IS_ERR(resp))
2602 return PTR_ERR(resp);
2603
2604 dev_kfree_skb(resp);
2605 return 0;
2606 }
2607
pn533_dev_up(struct nfc_dev * nfc_dev)2608 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2609 {
2610 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2611 int rc;
2612
2613 if (dev->phy_ops->dev_up) {
2614 rc = dev->phy_ops->dev_up(dev);
2615 if (rc)
2616 return rc;
2617 }
2618
2619 if ((dev->device_type == PN533_DEVICE_PN532) ||
2620 (dev->device_type == PN533_DEVICE_PN532_AUTOPOLL)) {
2621 rc = pn532_sam_configuration(nfc_dev);
2622
2623 if (rc)
2624 return rc;
2625 }
2626
2627 return pn533_rf_field(nfc_dev, 1);
2628 }
2629
pn533_dev_down(struct nfc_dev * nfc_dev)2630 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2631 {
2632 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2633 int ret;
2634
2635 ret = pn533_rf_field(nfc_dev, 0);
2636 if (dev->phy_ops->dev_down && !ret)
2637 ret = dev->phy_ops->dev_down(dev);
2638
2639 return ret;
2640 }
2641
2642 static const struct nfc_ops pn533_nfc_ops = {
2643 .dev_up = pn533_dev_up,
2644 .dev_down = pn533_dev_down,
2645 .dep_link_up = pn533_dep_link_up,
2646 .dep_link_down = pn533_dep_link_down,
2647 .start_poll = pn533_start_poll,
2648 .stop_poll = pn533_stop_poll,
2649 .activate_target = pn533_activate_target,
2650 .deactivate_target = pn533_deactivate_target,
2651 .im_transceive = pn533_transceive,
2652 .tm_send = pn533_tm_send,
2653 };
2654
pn533_setup(struct pn533 * dev)2655 static int pn533_setup(struct pn533 *dev)
2656 {
2657 struct pn533_config_max_retries max_retries;
2658 struct pn533_config_timing timing;
2659 u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2660 int rc;
2661
2662 switch (dev->device_type) {
2663 case PN533_DEVICE_STD:
2664 case PN533_DEVICE_PASORI:
2665 case PN533_DEVICE_ACR122U:
2666 case PN533_DEVICE_PN532:
2667 case PN533_DEVICE_PN532_AUTOPOLL:
2668 max_retries.mx_rty_atr = 0x2;
2669 max_retries.mx_rty_psl = 0x1;
2670 max_retries.mx_rty_passive_act =
2671 PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2672
2673 timing.rfu = PN533_CONFIG_TIMING_102;
2674 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2675 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2676
2677 break;
2678
2679 default:
2680 nfc_err(dev->dev, "Unknown device type %d\n",
2681 dev->device_type);
2682 return -EINVAL;
2683 }
2684
2685 rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2686 (u8 *)&max_retries, sizeof(max_retries));
2687 if (rc) {
2688 nfc_err(dev->dev,
2689 "Error on setting MAX_RETRIES config\n");
2690 return rc;
2691 }
2692
2693
2694 rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2695 (u8 *)&timing, sizeof(timing));
2696 if (rc) {
2697 nfc_err(dev->dev, "Error on setting RF timings\n");
2698 return rc;
2699 }
2700
2701 switch (dev->device_type) {
2702 case PN533_DEVICE_STD:
2703 case PN533_DEVICE_PN532:
2704 case PN533_DEVICE_PN532_AUTOPOLL:
2705 break;
2706
2707 case PN533_DEVICE_PASORI:
2708 pn533_pasori_fw_reset(dev);
2709
2710 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2711 pasori_cfg, 3);
2712 if (rc) {
2713 nfc_err(dev->dev,
2714 "Error while settings PASORI config\n");
2715 return rc;
2716 }
2717
2718 pn533_pasori_fw_reset(dev);
2719
2720 break;
2721 }
2722
2723 return 0;
2724 }
2725
pn533_finalize_setup(struct pn533 * dev)2726 int pn533_finalize_setup(struct pn533 *dev)
2727 {
2728
2729 struct pn533_fw_version fw_ver;
2730 int rc;
2731
2732 memset(&fw_ver, 0, sizeof(fw_ver));
2733
2734 rc = pn533_get_firmware_version(dev, &fw_ver);
2735 if (rc) {
2736 nfc_err(dev->dev, "Unable to get FW version\n");
2737 return rc;
2738 }
2739
2740 nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2741 fw_ver.ic, fw_ver.ver, fw_ver.rev);
2742
2743 rc = pn533_setup(dev);
2744 if (rc)
2745 return rc;
2746
2747 return 0;
2748 }
2749 EXPORT_SYMBOL_GPL(pn533_finalize_setup);
2750
pn53x_common_init(u32 device_type,enum pn533_protocol_type protocol_type,void * phy,const struct pn533_phy_ops * phy_ops,struct pn533_frame_ops * fops,struct device * dev)2751 struct pn533 *pn53x_common_init(u32 device_type,
2752 enum pn533_protocol_type protocol_type,
2753 void *phy,
2754 const struct pn533_phy_ops *phy_ops,
2755 struct pn533_frame_ops *fops,
2756 struct device *dev)
2757 {
2758 struct pn533 *priv;
2759
2760 priv = kzalloc_obj(*priv);
2761 if (!priv)
2762 return ERR_PTR(-ENOMEM);
2763
2764 priv->phy = phy;
2765 priv->phy_ops = phy_ops;
2766 priv->dev = dev;
2767 if (fops != NULL)
2768 priv->ops = fops;
2769 else
2770 priv->ops = &pn533_std_frame_ops;
2771
2772 priv->protocol_type = protocol_type;
2773 priv->device_type = device_type;
2774
2775 mutex_init(&priv->cmd_lock);
2776
2777 INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2778 INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2779 INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2780 INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2781 INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2782 INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2783 INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2784 INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2785 INIT_WORK(&priv->rf_work, pn533_wq_rf);
2786 priv->wq = alloc_ordered_workqueue("pn533", 0);
2787 if (priv->wq == NULL)
2788 goto error;
2789
2790 timer_setup(&priv->listen_timer, pn533_listen_mode_timer, 0);
2791
2792 skb_queue_head_init(&priv->resp_q);
2793 skb_queue_head_init(&priv->fragment_skb);
2794
2795 INIT_LIST_HEAD(&priv->cmd_queue);
2796 return priv;
2797
2798 error:
2799 kfree(priv);
2800 return ERR_PTR(-ENOMEM);
2801 }
2802 EXPORT_SYMBOL_GPL(pn53x_common_init);
2803
pn53x_common_clean(struct pn533 * priv)2804 void pn53x_common_clean(struct pn533 *priv)
2805 {
2806 struct pn533_cmd *cmd, *n;
2807
2808 /* delete the timer before cleanup the worker */
2809 timer_shutdown_sync(&priv->listen_timer);
2810
2811 flush_delayed_work(&priv->poll_work);
2812 destroy_workqueue(priv->wq);
2813
2814 skb_queue_purge(&priv->resp_q);
2815 skb_queue_purge(&priv->fragment_skb);
2816
2817 list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2818 list_del(&cmd->queue);
2819 kfree(cmd);
2820 }
2821
2822 kfree(priv);
2823 }
2824 EXPORT_SYMBOL_GPL(pn53x_common_clean);
2825
pn532_i2c_nfc_alloc(struct pn533 * priv,u32 protocols,struct device * parent)2826 int pn532_i2c_nfc_alloc(struct pn533 *priv, u32 protocols,
2827 struct device *parent)
2828 {
2829 priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2830 priv->ops->tx_header_len +
2831 PN533_CMD_DATAEXCH_HEAD_LEN,
2832 priv->ops->tx_tail_len);
2833 if (!priv->nfc_dev)
2834 return -ENOMEM;
2835
2836 nfc_set_parent_dev(priv->nfc_dev, parent);
2837 nfc_set_drvdata(priv->nfc_dev, priv);
2838 return 0;
2839 }
2840 EXPORT_SYMBOL_GPL(pn532_i2c_nfc_alloc);
2841
pn53x_register_nfc(struct pn533 * priv,u32 protocols,struct device * parent)2842 int pn53x_register_nfc(struct pn533 *priv, u32 protocols,
2843 struct device *parent)
2844 {
2845 int rc;
2846
2847 rc = pn532_i2c_nfc_alloc(priv, protocols, parent);
2848 if (rc)
2849 return rc;
2850
2851 rc = nfc_register_device(priv->nfc_dev);
2852 if (rc)
2853 nfc_free_device(priv->nfc_dev);
2854
2855 return rc;
2856 }
2857 EXPORT_SYMBOL_GPL(pn53x_register_nfc);
2858
pn53x_unregister_nfc(struct pn533 * priv)2859 void pn53x_unregister_nfc(struct pn533 *priv)
2860 {
2861 nfc_unregister_device(priv->nfc_dev);
2862 nfc_free_device(priv->nfc_dev);
2863 }
2864 EXPORT_SYMBOL_GPL(pn53x_unregister_nfc);
2865
2866 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
2867 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2868 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
2869 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2870 MODULE_VERSION(VERSION);
2871 MODULE_LICENSE("GPL");
2872