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) {
1361 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1362
1363 if (!dev->gb || !dev->gb_len) {
1364 dev->poll_dep = 0;
1365 queue_work(dev->wq, &dev->rf_work);
1366 }
1367 }
1368
1369 skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1370 skb_len += PASSIVE_DATA_LEN;
1371
1372 /* NFCID3 */
1373 skb_len += NFC_NFCID3_MAXSIZE;
1374 nfcid3[0] = 0x1;
1375 nfcid3[1] = 0xfe;
1376 get_random_bytes(nfcid3 + 2, 6);
1377
1378 skb = pn533_alloc_skb(dev, skb_len);
1379 if (!skb)
1380 return -ENOMEM;
1381
1382 skb_put_u8(skb, 0x01); /* Active */
1383 skb_put_u8(skb, 0x02); /* 424 kbps */
1384
1385 next = skb_put(skb, 1); /* Next */
1386 *next = 0;
1387
1388 /* Copy passive data */
1389 skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
1390 *next |= 1;
1391
1392 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1393 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
1394 *next |= 2;
1395
1396 skb_put_data(skb, dev->gb, dev->gb_len);
1397 *next |= 4; /* We have some Gi */
1398
1399 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1400 pn533_poll_dep_complete, NULL);
1401
1402 if (rc < 0)
1403 dev_kfree_skb(skb);
1404
1405 return rc;
1406 }
1407
pn533_autopoll_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1408 static int pn533_autopoll_complete(struct pn533 *dev, void *arg,
1409 struct sk_buff *resp)
1410 {
1411 struct pn532_autopoll_resp *apr;
1412 struct nfc_target nfc_tgt;
1413 u8 nbtg;
1414 int rc;
1415
1416 if (IS_ERR(resp)) {
1417 rc = PTR_ERR(resp);
1418
1419 nfc_err(dev->dev, "%s autopoll complete error %d\n",
1420 __func__, rc);
1421
1422 if (rc == -ENOENT) {
1423 if (dev->poll_mod_count != 0)
1424 return rc;
1425 goto stop_poll;
1426 }
1427 nfc_err(dev->dev, "Error %d when running autopoll\n", rc);
1428 goto stop_poll;
1429 }
1430
1431 nbtg = resp->data[0];
1432 if ((nbtg > 2) || (nbtg <= 0))
1433 return -EAGAIN;
1434
1435 apr = (struct pn532_autopoll_resp *)&resp->data[1];
1436 while (nbtg--) {
1437 memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1438 switch (apr->type) {
1439 case PN532_AUTOPOLL_TYPE_ISOA:
1440 dev_dbg(dev->dev, "ISOA\n");
1441 rc = pn533_target_found_type_a(&nfc_tgt, apr->tgdata,
1442 apr->ln - 1);
1443 break;
1444 case PN532_AUTOPOLL_TYPE_FELICA212:
1445 case PN532_AUTOPOLL_TYPE_FELICA424:
1446 dev_dbg(dev->dev, "FELICA\n");
1447 rc = pn533_target_found_felica(&nfc_tgt, apr->tgdata,
1448 apr->ln - 1);
1449 break;
1450 case PN532_AUTOPOLL_TYPE_JEWEL:
1451 dev_dbg(dev->dev, "JEWEL\n");
1452 rc = pn533_target_found_jewel(&nfc_tgt, apr->tgdata,
1453 apr->ln - 1);
1454 break;
1455 case PN532_AUTOPOLL_TYPE_ISOB:
1456 dev_dbg(dev->dev, "ISOB\n");
1457 rc = pn533_target_found_type_b(&nfc_tgt, apr->tgdata,
1458 apr->ln - 1);
1459 break;
1460 case PN532_AUTOPOLL_TYPE_MIFARE:
1461 dev_dbg(dev->dev, "Mifare\n");
1462 rc = pn533_target_found_type_a(&nfc_tgt, apr->tgdata,
1463 apr->ln - 1);
1464 break;
1465 default:
1466 nfc_err(dev->dev,
1467 "Unknown current poll modulation\n");
1468 rc = -EPROTO;
1469 }
1470
1471 if (rc)
1472 goto done;
1473
1474 if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1475 nfc_err(dev->dev,
1476 "The Tg found doesn't have the desired protocol\n");
1477 rc = -EAGAIN;
1478 goto done;
1479 }
1480
1481 dev->tgt_available_prots = nfc_tgt.supported_protocols;
1482 apr = (struct pn532_autopoll_resp *)
1483 (apr->tgdata + (apr->ln - 1));
1484 }
1485
1486 pn533_poll_reset_mod_list(dev);
1487 nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1488
1489 done:
1490 dev_kfree_skb(resp);
1491 return rc;
1492
1493 stop_poll:
1494 nfc_err(dev->dev, "autopoll operation has been stopped\n");
1495
1496 pn533_poll_reset_mod_list(dev);
1497 dev->poll_protocols = 0;
1498 return rc;
1499 }
1500
pn533_poll_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1501 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1502 struct sk_buff *resp)
1503 {
1504 struct pn533_poll_modulations *cur_mod;
1505 int rc;
1506
1507 if (IS_ERR(resp)) {
1508 rc = PTR_ERR(resp);
1509
1510 nfc_err(dev->dev, "%s Poll complete error %d\n",
1511 __func__, rc);
1512
1513 if (rc == -ENOENT) {
1514 if (dev->poll_mod_count != 0)
1515 return rc;
1516 goto stop_poll;
1517 }
1518 nfc_err(dev->dev, "Error %d when running poll\n", rc);
1519 goto stop_poll;
1520 }
1521
1522 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1523
1524 if (cur_mod->len == 0) { /* Target mode */
1525 timer_delete(&dev->listen_timer);
1526 rc = pn533_init_target_complete(dev, resp);
1527 goto done;
1528 }
1529
1530 /* Initiator mode */
1531 rc = pn533_start_poll_complete(dev, resp);
1532 if (!rc)
1533 goto done;
1534
1535 if (!dev->poll_mod_count) {
1536 dev_dbg(dev->dev, "Polling has been stopped\n");
1537 goto done;
1538 }
1539
1540 pn533_poll_next_mod(dev);
1541 /* Not target found, turn radio off */
1542 queue_work(dev->wq, &dev->rf_work);
1543
1544 done:
1545 dev_kfree_skb(resp);
1546 return rc;
1547
1548 stop_poll:
1549 nfc_err(dev->dev, "Polling operation has been stopped\n");
1550
1551 pn533_poll_reset_mod_list(dev);
1552 dev->poll_protocols = 0;
1553 return rc;
1554 }
1555
pn533_alloc_poll_in_frame(struct pn533 * dev,struct pn533_poll_modulations * mod)1556 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1557 struct pn533_poll_modulations *mod)
1558 {
1559 struct sk_buff *skb;
1560
1561 skb = pn533_alloc_skb(dev, mod->len);
1562 if (!skb)
1563 return NULL;
1564
1565 skb_put_data(skb, &mod->data, mod->len);
1566
1567 return skb;
1568 }
1569
pn533_send_poll_frame(struct pn533 * dev)1570 static int pn533_send_poll_frame(struct pn533 *dev)
1571 {
1572 struct pn533_poll_modulations *mod;
1573 struct sk_buff *skb;
1574 int rc;
1575 u8 cmd_code;
1576
1577 mod = dev->poll_mod_active[dev->poll_mod_curr];
1578
1579 dev_dbg(dev->dev, "%s mod len %d\n",
1580 __func__, mod->len);
1581
1582 if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep) {
1583 dev->poll_dep = 0;
1584 return pn533_poll_dep(dev->nfc_dev);
1585 }
1586
1587 if (mod->len == 0) { /* Listen mode */
1588 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1589 skb = pn533_alloc_poll_tg_frame(dev);
1590 } else { /* Polling mode */
1591 cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET;
1592 skb = pn533_alloc_poll_in_frame(dev, mod);
1593 }
1594
1595 if (!skb) {
1596 nfc_err(dev->dev, "Failed to allocate skb\n");
1597 return -ENOMEM;
1598 }
1599
1600 rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1601 NULL);
1602 if (rc < 0) {
1603 dev_kfree_skb(skb);
1604 nfc_err(dev->dev, "Polling loop error %d\n", rc);
1605 }
1606
1607 return rc;
1608 }
1609
pn533_wq_poll(struct work_struct * work)1610 static void pn533_wq_poll(struct work_struct *work)
1611 {
1612 struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1613 struct pn533_poll_modulations *cur_mod;
1614 int rc;
1615
1616 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1617
1618 dev_dbg(dev->dev,
1619 "%s cancel_listen %d modulation len %d\n",
1620 __func__, dev->cancel_listen, cur_mod->len);
1621
1622 if (dev->cancel_listen == 1) {
1623 dev->cancel_listen = 0;
1624 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC);
1625 }
1626
1627 rc = pn533_send_poll_frame(dev);
1628 if (rc)
1629 return;
1630
1631 if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1632 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1633 }
1634
pn533_start_poll(struct nfc_dev * nfc_dev,u32 im_protocols,u32 tm_protocols)1635 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1636 u32 im_protocols, u32 tm_protocols)
1637 {
1638 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1639 struct pn533_poll_modulations *cur_mod;
1640 struct sk_buff *skb;
1641 u8 rand_mod;
1642 int rc;
1643
1644 dev_dbg(dev->dev,
1645 "%s: im protocols 0x%x tm protocols 0x%x\n",
1646 __func__, im_protocols, tm_protocols);
1647
1648 if (dev->tgt_active_prot) {
1649 nfc_err(dev->dev,
1650 "Cannot poll with a target already activated\n");
1651 return -EBUSY;
1652 }
1653
1654 if (dev->tgt_mode) {
1655 nfc_err(dev->dev,
1656 "Cannot poll while already being activated\n");
1657 return -EBUSY;
1658 }
1659
1660 if (tm_protocols) {
1661 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1662 if (dev->gb == NULL)
1663 tm_protocols = 0;
1664 }
1665
1666 dev->poll_protocols = im_protocols;
1667 dev->listen_protocols = tm_protocols;
1668 if (dev->device_type == PN533_DEVICE_PN532_AUTOPOLL) {
1669 skb = pn533_alloc_skb(dev, 4 + 6);
1670 if (!skb)
1671 return -ENOMEM;
1672
1673 *((u8 *)skb_put(skb, sizeof(u8))) =
1674 PN532_AUTOPOLL_POLLNR_INFINITE;
1675 *((u8 *)skb_put(skb, sizeof(u8))) = PN532_AUTOPOLL_PERIOD;
1676
1677 if ((im_protocols & NFC_PROTO_MIFARE_MASK) &&
1678 (im_protocols & NFC_PROTO_ISO14443_MASK) &&
1679 (im_protocols & NFC_PROTO_NFC_DEP_MASK))
1680 *((u8 *)skb_put(skb, sizeof(u8))) =
1681 PN532_AUTOPOLL_TYPE_GENERIC_106;
1682 else {
1683 if (im_protocols & NFC_PROTO_MIFARE_MASK)
1684 *((u8 *)skb_put(skb, sizeof(u8))) =
1685 PN532_AUTOPOLL_TYPE_MIFARE;
1686
1687 if (im_protocols & NFC_PROTO_ISO14443_MASK)
1688 *((u8 *)skb_put(skb, sizeof(u8))) =
1689 PN532_AUTOPOLL_TYPE_ISOA;
1690
1691 if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1692 *((u8 *)skb_put(skb, sizeof(u8))) =
1693 PN532_AUTOPOLL_TYPE_DEP_PASSIVE_106;
1694 *((u8 *)skb_put(skb, sizeof(u8))) =
1695 PN532_AUTOPOLL_TYPE_DEP_PASSIVE_212;
1696 *((u8 *)skb_put(skb, sizeof(u8))) =
1697 PN532_AUTOPOLL_TYPE_DEP_PASSIVE_424;
1698 }
1699 }
1700
1701 if (im_protocols & NFC_PROTO_FELICA_MASK ||
1702 im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1703 *((u8 *)skb_put(skb, sizeof(u8))) =
1704 PN532_AUTOPOLL_TYPE_FELICA212;
1705 *((u8 *)skb_put(skb, sizeof(u8))) =
1706 PN532_AUTOPOLL_TYPE_FELICA424;
1707 }
1708
1709 if (im_protocols & NFC_PROTO_JEWEL_MASK)
1710 *((u8 *)skb_put(skb, sizeof(u8))) =
1711 PN532_AUTOPOLL_TYPE_JEWEL;
1712
1713 if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1714 *((u8 *)skb_put(skb, sizeof(u8))) =
1715 PN532_AUTOPOLL_TYPE_ISOB;
1716
1717 if (tm_protocols)
1718 *((u8 *)skb_put(skb, sizeof(u8))) =
1719 PN532_AUTOPOLL_TYPE_DEP_ACTIVE_106;
1720
1721 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_AUTOPOLL, skb,
1722 pn533_autopoll_complete, NULL);
1723
1724 if (rc < 0)
1725 dev_kfree_skb(skb);
1726 else
1727 dev->poll_mod_count++;
1728
1729 return rc;
1730 }
1731
1732 pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1733 if (!dev->poll_mod_count) {
1734 nfc_err(dev->dev,
1735 "Poll mod list is empty\n");
1736 return -EINVAL;
1737 }
1738
1739 /* Do not always start polling from the same modulation */
1740 get_random_bytes(&rand_mod, sizeof(rand_mod));
1741 rand_mod %= dev->poll_mod_count;
1742 dev->poll_mod_curr = rand_mod;
1743
1744 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1745
1746 rc = pn533_send_poll_frame(dev);
1747
1748 /* Start listen timer */
1749 if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
1750 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1751
1752 return rc;
1753 }
1754
pn533_stop_poll(struct nfc_dev * nfc_dev)1755 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1756 {
1757 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1758
1759 timer_delete(&dev->listen_timer);
1760
1761 if (!dev->poll_mod_count) {
1762 dev_dbg(dev->dev,
1763 "Polling operation was not running\n");
1764 return;
1765 }
1766
1767 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1768 flush_delayed_work(&dev->poll_work);
1769 pn533_poll_reset_mod_list(dev);
1770 }
1771
pn533_activate_target_nfcdep(struct pn533 * dev)1772 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1773 {
1774 struct pn533_cmd_activate_response *rsp;
1775 u16 gt_len;
1776 int rc;
1777 struct sk_buff *skb;
1778 struct sk_buff *resp;
1779
1780 skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1781 if (!skb)
1782 return -ENOMEM;
1783
1784 skb_put_u8(skb, 1); /* TG */
1785 skb_put_u8(skb, 0); /* Next */
1786
1787 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1788 if (IS_ERR(resp))
1789 return PTR_ERR(resp);
1790
1791 rsp = (struct pn533_cmd_activate_response *)resp->data;
1792 rc = rsp->status & PN533_CMD_RET_MASK;
1793 if (rc != PN533_CMD_RET_SUCCESS) {
1794 nfc_err(dev->dev,
1795 "Target activation failed (error 0x%x)\n", rc);
1796 dev_kfree_skb(resp);
1797 return -EIO;
1798 }
1799
1800 /* ATR_RES general bytes are located at offset 16 */
1801 gt_len = resp->len - 16;
1802 rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1803
1804 dev_kfree_skb(resp);
1805 return rc;
1806 }
1807
pn533_activate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,u32 protocol)1808 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1809 struct nfc_target *target, u32 protocol)
1810 {
1811 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1812 int rc;
1813
1814 dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol);
1815
1816 if (dev->poll_mod_count) {
1817 nfc_err(dev->dev,
1818 "Cannot activate while polling\n");
1819 return -EBUSY;
1820 }
1821
1822 if (dev->tgt_active_prot) {
1823 nfc_err(dev->dev,
1824 "There is already an active target\n");
1825 return -EBUSY;
1826 }
1827
1828 if (!dev->tgt_available_prots) {
1829 nfc_err(dev->dev,
1830 "There is no available target to activate\n");
1831 return -EINVAL;
1832 }
1833
1834 if (!(dev->tgt_available_prots & (1 << protocol))) {
1835 nfc_err(dev->dev,
1836 "Target doesn't support requested proto %u\n",
1837 protocol);
1838 return -EINVAL;
1839 }
1840
1841 if (protocol == NFC_PROTO_NFC_DEP) {
1842 rc = pn533_activate_target_nfcdep(dev);
1843 if (rc) {
1844 nfc_err(dev->dev,
1845 "Activating target with DEP failed %d\n", rc);
1846 return rc;
1847 }
1848 }
1849
1850 dev->tgt_active_prot = protocol;
1851 dev->tgt_available_prots = 0;
1852
1853 return 0;
1854 }
1855
pn533_deactivate_target_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1856 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg,
1857 struct sk_buff *resp)
1858 {
1859 int rc = 0;
1860
1861 if (IS_ERR(resp)) {
1862 rc = PTR_ERR(resp);
1863
1864 nfc_err(dev->dev, "Target release error %d\n", rc);
1865
1866 return rc;
1867 }
1868
1869 rc = resp->data[0] & PN533_CMD_RET_MASK;
1870 if (rc != PN533_CMD_RET_SUCCESS)
1871 nfc_err(dev->dev,
1872 "Error 0x%x when releasing the target\n", rc);
1873
1874 dev_kfree_skb(resp);
1875 return rc;
1876 }
1877
pn533_deactivate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,u8 mode)1878 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1879 struct nfc_target *target, u8 mode)
1880 {
1881 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1882 struct sk_buff *skb;
1883 int rc;
1884
1885 if (!dev->tgt_active_prot) {
1886 nfc_err(dev->dev, "There is no active target\n");
1887 return;
1888 }
1889
1890 dev->tgt_active_prot = 0;
1891 skb_queue_purge(&dev->resp_q);
1892
1893 skb = pn533_alloc_skb(dev, sizeof(u8));
1894 if (!skb)
1895 return;
1896
1897 skb_put_u8(skb, 1); /* TG*/
1898
1899 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb,
1900 pn533_deactivate_target_complete, NULL);
1901 if (rc < 0) {
1902 dev_kfree_skb(skb);
1903 nfc_err(dev->dev, "Target release error %d\n", rc);
1904 }
1905 }
1906
1907
pn533_in_dep_link_up_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1908 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1909 struct sk_buff *resp)
1910 {
1911 struct pn533_cmd_jump_dep_response *rsp;
1912 u8 target_gt_len;
1913 int rc;
1914 u8 active = *(u8 *)arg;
1915
1916 kfree(arg);
1917
1918 if (IS_ERR(resp))
1919 return PTR_ERR(resp);
1920
1921 if (dev->tgt_available_prots &&
1922 !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1923 nfc_err(dev->dev,
1924 "The target does not support DEP\n");
1925 rc = -EINVAL;
1926 goto error;
1927 }
1928
1929 rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1930
1931 rc = rsp->status & PN533_CMD_RET_MASK;
1932 if (rc != PN533_CMD_RET_SUCCESS) {
1933 nfc_err(dev->dev,
1934 "Bringing DEP link up failed (error 0x%x)\n", rc);
1935 goto error;
1936 }
1937
1938 if (!dev->tgt_available_prots) {
1939 struct nfc_target nfc_target;
1940
1941 dev_dbg(dev->dev, "Creating new target\n");
1942
1943 memset(&nfc_target, 0, sizeof(struct nfc_target));
1944
1945 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1946 nfc_target.nfcid1_len = 10;
1947 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1948 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1949 if (rc)
1950 goto error;
1951
1952 dev->tgt_available_prots = 0;
1953 }
1954
1955 dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1956
1957 /* ATR_RES general bytes are located at offset 17 */
1958 target_gt_len = resp->len - 17;
1959 rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1960 rsp->gt, target_gt_len);
1961 if (rc == 0)
1962 rc = nfc_dep_link_is_up(dev->nfc_dev,
1963 dev->nfc_dev->targets[0].idx,
1964 !active, NFC_RF_INITIATOR);
1965
1966 error:
1967 dev_kfree_skb(resp);
1968 return rc;
1969 }
1970
1971 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)1972 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1973 u8 comm_mode, u8 *gb, size_t gb_len)
1974 {
1975 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1976 struct sk_buff *skb;
1977 int rc, skb_len;
1978 u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
1979 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1980
1981 if (dev->poll_mod_count) {
1982 nfc_err(dev->dev,
1983 "Cannot bring the DEP link up while polling\n");
1984 return -EBUSY;
1985 }
1986
1987 if (dev->tgt_active_prot) {
1988 nfc_err(dev->dev,
1989 "There is already an active target\n");
1990 return -EBUSY;
1991 }
1992
1993 skb_len = 3 + gb_len; /* ActPass + BR + Next */
1994 skb_len += PASSIVE_DATA_LEN;
1995
1996 /* NFCID3 */
1997 skb_len += NFC_NFCID3_MAXSIZE;
1998 if (target && !target->nfcid2_len) {
1999 nfcid3[0] = 0x1;
2000 nfcid3[1] = 0xfe;
2001 get_random_bytes(nfcid3 + 2, 6);
2002 }
2003
2004 skb = pn533_alloc_skb(dev, skb_len);
2005 if (!skb)
2006 return -ENOMEM;
2007
2008 skb_put_u8(skb, !comm_mode); /* ActPass */
2009 skb_put_u8(skb, 0x02); /* 424 kbps */
2010
2011 next = skb_put(skb, 1); /* Next */
2012 *next = 0;
2013
2014 /* Copy passive data */
2015 skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
2016 *next |= 1;
2017
2018 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
2019 if (target && target->nfcid2_len)
2020 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
2021 target->nfcid2_len);
2022 else
2023 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
2024 *next |= 2;
2025
2026 if (gb != NULL && gb_len > 0) {
2027 skb_put_data(skb, gb, gb_len);
2028 *next |= 4; /* We have some Gi */
2029 } else {
2030 *next = 0;
2031 }
2032
2033 arg = kmalloc_obj(*arg);
2034 if (!arg) {
2035 dev_kfree_skb(skb);
2036 return -ENOMEM;
2037 }
2038
2039 *arg = !comm_mode;
2040
2041 pn533_rf_field(dev->nfc_dev, 0);
2042
2043 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
2044 pn533_in_dep_link_up_complete, arg);
2045
2046 if (rc < 0) {
2047 dev_kfree_skb(skb);
2048 kfree(arg);
2049 }
2050
2051 return rc;
2052 }
2053
pn533_dep_link_down(struct nfc_dev * nfc_dev)2054 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
2055 {
2056 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2057
2058 pn533_poll_reset_mod_list(dev);
2059
2060 if (dev->tgt_mode || dev->tgt_active_prot)
2061 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
2062
2063 dev->tgt_active_prot = 0;
2064 dev->tgt_mode = 0;
2065
2066 skb_queue_purge(&dev->resp_q);
2067
2068 return 0;
2069 }
2070
2071 struct pn533_data_exchange_arg {
2072 data_exchange_cb_t cb;
2073 void *cb_context;
2074 };
2075
pn533_build_response(struct pn533 * dev)2076 static struct sk_buff *pn533_build_response(struct pn533 *dev)
2077 {
2078 struct sk_buff *skb, *tmp, *t;
2079 unsigned int skb_len = 0, tmp_len = 0;
2080
2081 if (skb_queue_empty(&dev->resp_q))
2082 return NULL;
2083
2084 if (skb_queue_len(&dev->resp_q) == 1) {
2085 skb = skb_dequeue(&dev->resp_q);
2086 goto out;
2087 }
2088
2089 skb_queue_walk_safe(&dev->resp_q, tmp, t)
2090 skb_len += tmp->len;
2091
2092 dev_dbg(dev->dev, "%s total length %d\n",
2093 __func__, skb_len);
2094
2095 skb = alloc_skb(skb_len, GFP_KERNEL);
2096 if (skb == NULL)
2097 goto out;
2098
2099 skb_put(skb, skb_len);
2100
2101 skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2102 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2103 tmp_len += tmp->len;
2104 }
2105
2106 out:
2107 skb_queue_purge(&dev->resp_q);
2108
2109 return skb;
2110 }
2111
pn533_data_exchange_complete(struct pn533 * dev,void * _arg,struct sk_buff * resp)2112 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2113 struct sk_buff *resp)
2114 {
2115 struct pn533_data_exchange_arg *arg = _arg;
2116 struct sk_buff *skb;
2117 int rc = 0;
2118 u8 status, ret, mi;
2119
2120 if (IS_ERR(resp)) {
2121 rc = PTR_ERR(resp);
2122 goto _error;
2123 }
2124
2125 status = resp->data[0];
2126 ret = status & PN533_CMD_RET_MASK;
2127 mi = status & PN533_CMD_MI_MASK;
2128
2129 skb_pull(resp, sizeof(status));
2130
2131 if (ret != PN533_CMD_RET_SUCCESS) {
2132 nfc_err(dev->dev,
2133 "Exchanging data failed (error 0x%x)\n", ret);
2134 rc = -EIO;
2135 goto error;
2136 }
2137
2138 skb_queue_tail(&dev->resp_q, resp);
2139
2140 if (mi) {
2141 dev->cmd_complete_mi_arg = arg;
2142 queue_work(dev->wq, &dev->mi_rx_work);
2143 return -EINPROGRESS;
2144 }
2145
2146 /* Prepare for the next round */
2147 if (skb_queue_len(&dev->fragment_skb) > 0) {
2148 dev->cmd_complete_dep_arg = arg;
2149 queue_work(dev->wq, &dev->mi_tx_work);
2150
2151 return -EINPROGRESS;
2152 }
2153
2154 skb = pn533_build_response(dev);
2155 if (!skb) {
2156 rc = -ENOMEM;
2157 goto error;
2158 }
2159
2160 arg->cb(arg->cb_context, skb, 0);
2161 kfree(arg);
2162 return 0;
2163
2164 error:
2165 dev_kfree_skb(resp);
2166 _error:
2167 skb_queue_purge(&dev->resp_q);
2168 arg->cb(arg->cb_context, NULL, rc);
2169 kfree(arg);
2170 return rc;
2171 }
2172
2173 /*
2174 * Receive an incoming pn533 frame. skb contains only header and payload.
2175 * If skb == NULL, it is a notification that the link below is dead.
2176 */
pn533_recv_frame(struct pn533 * dev,struct sk_buff * skb,int status)2177 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2178 {
2179 if (!dev->cmd)
2180 goto sched_wq;
2181
2182 dev->cmd->status = status;
2183
2184 if (status != 0) {
2185 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2186 goto sched_wq;
2187 }
2188
2189 if (skb == NULL) {
2190 dev_err(dev->dev, "NULL Frame -> link is dead\n");
2191 goto sched_wq;
2192 }
2193
2194 if (pn533_rx_frame_is_ack(skb->data)) {
2195 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2196 dev_kfree_skb(skb);
2197 return;
2198 }
2199
2200 print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2201 dev->ops->rx_frame_size(skb->data), false);
2202
2203 if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2204 nfc_err(dev->dev, "Received an invalid frame\n");
2205 dev->cmd->status = -EIO;
2206 } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2207 nfc_err(dev->dev, "It it not the response to the last command\n");
2208 dev->cmd->status = -EIO;
2209 }
2210
2211 dev->cmd->resp = skb;
2212
2213 sched_wq:
2214 queue_work(dev->wq, &dev->cmd_complete_work);
2215 }
2216 EXPORT_SYMBOL(pn533_recv_frame);
2217
2218 /* Split the Tx skb into small chunks */
pn533_fill_fragment_skbs(struct pn533 * dev,struct sk_buff * skb)2219 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2220 {
2221 struct sk_buff *frag;
2222 int frag_size;
2223
2224 do {
2225 /* Remaining size */
2226 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2227 frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2228 else
2229 frag_size = skb->len;
2230
2231 /* Allocate and reserve */
2232 frag = pn533_alloc_skb(dev, frag_size);
2233 if (!frag) {
2234 skb_queue_purge(&dev->fragment_skb);
2235 return -ENOMEM;
2236 }
2237
2238 if (!dev->tgt_mode) {
2239 /* Reserve the TG/MI byte */
2240 skb_reserve(frag, 1);
2241
2242 /* MI + TG */
2243 if (frag_size == PN533_CMD_DATAFRAME_MAXLEN)
2244 *(u8 *)skb_push(frag, sizeof(u8)) =
2245 (PN533_CMD_MI_MASK | 1);
2246 else
2247 *(u8 *)skb_push(frag, sizeof(u8)) = 1; /* TG */
2248 }
2249
2250 skb_put_data(frag, skb->data, frag_size);
2251
2252 /* Reduce the size of incoming buffer */
2253 skb_pull(skb, frag_size);
2254
2255 /* Add this to skb_queue */
2256 skb_queue_tail(&dev->fragment_skb, frag);
2257
2258 } while (skb->len > 0);
2259
2260 dev_kfree_skb(skb);
2261
2262 return skb_queue_len(&dev->fragment_skb);
2263 }
2264
pn533_transceive(struct nfc_dev * nfc_dev,struct nfc_target * target,struct sk_buff * skb,data_exchange_cb_t cb,void * cb_context)2265 static int pn533_transceive(struct nfc_dev *nfc_dev,
2266 struct nfc_target *target, struct sk_buff *skb,
2267 data_exchange_cb_t cb, void *cb_context)
2268 {
2269 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2270 struct pn533_data_exchange_arg *arg = NULL;
2271 int rc;
2272
2273 if (!dev->tgt_active_prot) {
2274 nfc_err(dev->dev,
2275 "Can't exchange data if there is no active target\n");
2276 rc = -EINVAL;
2277 goto error;
2278 }
2279
2280 arg = kmalloc_obj(*arg);
2281 if (!arg) {
2282 rc = -ENOMEM;
2283 goto error;
2284 }
2285
2286 arg->cb = cb;
2287 arg->cb_context = cb_context;
2288
2289 switch (dev->device_type) {
2290 case PN533_DEVICE_PASORI:
2291 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2292 rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2293 skb,
2294 pn533_data_exchange_complete,
2295 arg);
2296
2297 break;
2298 }
2299 fallthrough;
2300 default:
2301 /* jumbo frame ? */
2302 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2303 rc = pn533_fill_fragment_skbs(dev, skb);
2304 if (rc < 0)
2305 goto error;
2306
2307 skb = skb_dequeue(&dev->fragment_skb);
2308 if (!skb) {
2309 rc = -EIO;
2310 goto error;
2311 }
2312 } else {
2313 *(u8 *)skb_push(skb, sizeof(u8)) = 1; /* TG */
2314 }
2315
2316 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2317 skb, pn533_data_exchange_complete,
2318 arg);
2319
2320 break;
2321 }
2322
2323 if (rc < 0) /* rc from send_async */
2324 goto error;
2325
2326 return 0;
2327
2328 error:
2329 kfree(arg);
2330 dev_kfree_skb(skb);
2331 return rc;
2332 }
2333
pn533_tm_send_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)2334 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2335 struct sk_buff *resp)
2336 {
2337 u8 status;
2338
2339 if (IS_ERR(resp))
2340 return PTR_ERR(resp);
2341
2342 status = resp->data[0];
2343
2344 /* Prepare for the next round */
2345 if (skb_queue_len(&dev->fragment_skb) > 0) {
2346 queue_work(dev->wq, &dev->mi_tm_tx_work);
2347 return -EINPROGRESS;
2348 }
2349 dev_kfree_skb(resp);
2350
2351 if (status != 0) {
2352 nfc_tm_deactivated(dev->nfc_dev);
2353
2354 dev->tgt_mode = 0;
2355
2356 return 0;
2357 }
2358
2359 queue_work(dev->wq, &dev->tg_work);
2360
2361 return 0;
2362 }
2363
pn533_tm_send(struct nfc_dev * nfc_dev,struct sk_buff * skb)2364 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2365 {
2366 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2367 int rc;
2368
2369 /* let's split in multiple chunks if size's too big */
2370 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2371 rc = pn533_fill_fragment_skbs(dev, skb);
2372 if (rc < 0)
2373 goto error;
2374
2375 /* get the first skb */
2376 skb = skb_dequeue(&dev->fragment_skb);
2377 if (!skb) {
2378 rc = -EIO;
2379 goto error;
2380 }
2381
2382 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2383 pn533_tm_send_complete, NULL);
2384 } else {
2385 /* Send th skb */
2386 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2387 pn533_tm_send_complete, NULL);
2388 }
2389
2390 error:
2391 if (rc < 0) {
2392 dev_kfree_skb(skb);
2393 skb_queue_purge(&dev->fragment_skb);
2394 }
2395
2396 return rc;
2397 }
2398
pn533_wq_mi_recv(struct work_struct * work)2399 static void pn533_wq_mi_recv(struct work_struct *work)
2400 {
2401 struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2402 struct sk_buff *skb;
2403 int rc;
2404
2405 skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2406 if (!skb)
2407 goto error;
2408
2409 switch (dev->device_type) {
2410 case PN533_DEVICE_PASORI:
2411 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2412 rc = pn533_send_cmd_direct_async(dev,
2413 PN533_CMD_IN_COMM_THRU,
2414 skb,
2415 pn533_data_exchange_complete,
2416 dev->cmd_complete_mi_arg);
2417
2418 break;
2419 }
2420 fallthrough;
2421 default:
2422 skb_put_u8(skb, 1); /*TG*/
2423
2424 rc = pn533_send_cmd_direct_async(dev,
2425 PN533_CMD_IN_DATA_EXCHANGE,
2426 skb,
2427 pn533_data_exchange_complete,
2428 dev->cmd_complete_mi_arg);
2429
2430 break;
2431 }
2432
2433 if (rc == 0) /* success */
2434 return;
2435
2436 nfc_err(dev->dev,
2437 "Error %d when trying to perform data_exchange\n", rc);
2438
2439 dev_kfree_skb(skb);
2440 kfree(dev->cmd_complete_mi_arg);
2441
2442 error:
2443 dev->phy_ops->send_ack(dev, GFP_KERNEL);
2444 queue_work(dev->wq, &dev->cmd_work);
2445 }
2446
pn533_wq_mi_send(struct work_struct * work)2447 static void pn533_wq_mi_send(struct work_struct *work)
2448 {
2449 struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2450 struct sk_buff *skb;
2451 int rc;
2452
2453 /* Grab the first skb in the queue */
2454 skb = skb_dequeue(&dev->fragment_skb);
2455
2456 if (skb == NULL) { /* No more data */
2457 /* Reset the queue for future use */
2458 skb_queue_head_init(&dev->fragment_skb);
2459 goto error;
2460 }
2461
2462 switch (dev->device_type) {
2463 case PN533_DEVICE_PASORI:
2464 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2465 rc = -EIO;
2466 break;
2467 }
2468
2469 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2470 skb,
2471 pn533_data_exchange_complete,
2472 dev->cmd_complete_dep_arg);
2473
2474 break;
2475
2476 default:
2477 /* Still some fragments? */
2478 rc = pn533_send_cmd_direct_async(dev,
2479 PN533_CMD_IN_DATA_EXCHANGE,
2480 skb,
2481 pn533_data_exchange_complete,
2482 dev->cmd_complete_dep_arg);
2483
2484 break;
2485 }
2486
2487 if (rc == 0) /* success */
2488 return;
2489
2490 nfc_err(dev->dev,
2491 "Error %d when trying to perform data_exchange\n", rc);
2492
2493 dev_kfree_skb(skb);
2494 kfree(dev->cmd_complete_dep_arg);
2495
2496 error:
2497 dev->phy_ops->send_ack(dev, GFP_KERNEL);
2498 queue_work(dev->wq, &dev->cmd_work);
2499 }
2500
pn533_set_configuration(struct pn533 * dev,u8 cfgitem,u8 * cfgdata,u8 cfgdata_len)2501 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2502 u8 cfgdata_len)
2503 {
2504 struct sk_buff *skb;
2505 struct sk_buff *resp;
2506 int skb_len;
2507
2508 skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2509
2510 skb = pn533_alloc_skb(dev, skb_len);
2511 if (!skb)
2512 return -ENOMEM;
2513
2514 skb_put_u8(skb, cfgitem);
2515 skb_put_data(skb, cfgdata, cfgdata_len);
2516
2517 resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2518 if (IS_ERR(resp))
2519 return PTR_ERR(resp);
2520
2521 dev_kfree_skb(resp);
2522 return 0;
2523 }
2524
pn533_get_firmware_version(struct pn533 * dev,struct pn533_fw_version * fv)2525 static int pn533_get_firmware_version(struct pn533 *dev,
2526 struct pn533_fw_version *fv)
2527 {
2528 struct sk_buff *skb;
2529 struct sk_buff *resp;
2530
2531 skb = pn533_alloc_skb(dev, 0);
2532 if (!skb)
2533 return -ENOMEM;
2534
2535 resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2536 if (IS_ERR(resp))
2537 return PTR_ERR(resp);
2538
2539 fv->ic = resp->data[0];
2540 fv->ver = resp->data[1];
2541 fv->rev = resp->data[2];
2542 fv->support = resp->data[3];
2543
2544 dev_kfree_skb(resp);
2545 return 0;
2546 }
2547
pn533_pasori_fw_reset(struct pn533 * dev)2548 static int pn533_pasori_fw_reset(struct pn533 *dev)
2549 {
2550 struct sk_buff *skb;
2551 struct sk_buff *resp;
2552
2553 skb = pn533_alloc_skb(dev, sizeof(u8));
2554 if (!skb)
2555 return -ENOMEM;
2556
2557 skb_put_u8(skb, 0x1);
2558
2559 resp = pn533_send_cmd_sync(dev, 0x18, skb);
2560 if (IS_ERR(resp))
2561 return PTR_ERR(resp);
2562
2563 dev_kfree_skb(resp);
2564
2565 return 0;
2566 }
2567
pn533_rf_field(struct nfc_dev * nfc_dev,u8 rf)2568 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2569 {
2570 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2571 u8 rf_field = !!rf;
2572 int rc;
2573
2574 rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2575
2576 rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2577 (u8 *)&rf_field, 1);
2578 if (rc) {
2579 nfc_err(dev->dev, "Error on setting RF field\n");
2580 return rc;
2581 }
2582
2583 return 0;
2584 }
2585
pn532_sam_configuration(struct nfc_dev * nfc_dev)2586 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2587 {
2588 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2589 struct sk_buff *skb;
2590 struct sk_buff *resp;
2591
2592 skb = pn533_alloc_skb(dev, 1);
2593 if (!skb)
2594 return -ENOMEM;
2595
2596 skb_put_u8(skb, 0x01);
2597
2598 resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2599 if (IS_ERR(resp))
2600 return PTR_ERR(resp);
2601
2602 dev_kfree_skb(resp);
2603 return 0;
2604 }
2605
pn533_dev_up(struct nfc_dev * nfc_dev)2606 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2607 {
2608 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2609 int rc;
2610
2611 if (dev->phy_ops->dev_up) {
2612 rc = dev->phy_ops->dev_up(dev);
2613 if (rc)
2614 return rc;
2615 }
2616
2617 if ((dev->device_type == PN533_DEVICE_PN532) ||
2618 (dev->device_type == PN533_DEVICE_PN532_AUTOPOLL)) {
2619 rc = pn532_sam_configuration(nfc_dev);
2620
2621 if (rc)
2622 return rc;
2623 }
2624
2625 return pn533_rf_field(nfc_dev, 1);
2626 }
2627
pn533_dev_down(struct nfc_dev * nfc_dev)2628 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2629 {
2630 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2631 int ret;
2632
2633 ret = pn533_rf_field(nfc_dev, 0);
2634 if (dev->phy_ops->dev_down && !ret)
2635 ret = dev->phy_ops->dev_down(dev);
2636
2637 return ret;
2638 }
2639
2640 static const struct nfc_ops pn533_nfc_ops = {
2641 .dev_up = pn533_dev_up,
2642 .dev_down = pn533_dev_down,
2643 .dep_link_up = pn533_dep_link_up,
2644 .dep_link_down = pn533_dep_link_down,
2645 .start_poll = pn533_start_poll,
2646 .stop_poll = pn533_stop_poll,
2647 .activate_target = pn533_activate_target,
2648 .deactivate_target = pn533_deactivate_target,
2649 .im_transceive = pn533_transceive,
2650 .tm_send = pn533_tm_send,
2651 };
2652
pn533_setup(struct pn533 * dev)2653 static int pn533_setup(struct pn533 *dev)
2654 {
2655 struct pn533_config_max_retries max_retries;
2656 struct pn533_config_timing timing;
2657 u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2658 int rc;
2659
2660 switch (dev->device_type) {
2661 case PN533_DEVICE_STD:
2662 case PN533_DEVICE_PASORI:
2663 case PN533_DEVICE_ACR122U:
2664 case PN533_DEVICE_PN532:
2665 case PN533_DEVICE_PN532_AUTOPOLL:
2666 max_retries.mx_rty_atr = 0x2;
2667 max_retries.mx_rty_psl = 0x1;
2668 max_retries.mx_rty_passive_act =
2669 PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2670
2671 timing.rfu = PN533_CONFIG_TIMING_102;
2672 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2673 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2674
2675 break;
2676
2677 default:
2678 nfc_err(dev->dev, "Unknown device type %d\n",
2679 dev->device_type);
2680 return -EINVAL;
2681 }
2682
2683 rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2684 (u8 *)&max_retries, sizeof(max_retries));
2685 if (rc) {
2686 nfc_err(dev->dev,
2687 "Error on setting MAX_RETRIES config\n");
2688 return rc;
2689 }
2690
2691
2692 rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2693 (u8 *)&timing, sizeof(timing));
2694 if (rc) {
2695 nfc_err(dev->dev, "Error on setting RF timings\n");
2696 return rc;
2697 }
2698
2699 switch (dev->device_type) {
2700 case PN533_DEVICE_STD:
2701 case PN533_DEVICE_PN532:
2702 case PN533_DEVICE_PN532_AUTOPOLL:
2703 break;
2704
2705 case PN533_DEVICE_PASORI:
2706 pn533_pasori_fw_reset(dev);
2707
2708 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2709 pasori_cfg, 3);
2710 if (rc) {
2711 nfc_err(dev->dev,
2712 "Error while settings PASORI config\n");
2713 return rc;
2714 }
2715
2716 pn533_pasori_fw_reset(dev);
2717
2718 break;
2719 }
2720
2721 return 0;
2722 }
2723
pn533_finalize_setup(struct pn533 * dev)2724 int pn533_finalize_setup(struct pn533 *dev)
2725 {
2726
2727 struct pn533_fw_version fw_ver;
2728 int rc;
2729
2730 memset(&fw_ver, 0, sizeof(fw_ver));
2731
2732 rc = pn533_get_firmware_version(dev, &fw_ver);
2733 if (rc) {
2734 nfc_err(dev->dev, "Unable to get FW version\n");
2735 return rc;
2736 }
2737
2738 nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2739 fw_ver.ic, fw_ver.ver, fw_ver.rev);
2740
2741 rc = pn533_setup(dev);
2742 if (rc)
2743 return rc;
2744
2745 return 0;
2746 }
2747 EXPORT_SYMBOL_GPL(pn533_finalize_setup);
2748
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)2749 struct pn533 *pn53x_common_init(u32 device_type,
2750 enum pn533_protocol_type protocol_type,
2751 void *phy,
2752 const struct pn533_phy_ops *phy_ops,
2753 struct pn533_frame_ops *fops,
2754 struct device *dev)
2755 {
2756 struct pn533 *priv;
2757
2758 priv = kzalloc_obj(*priv);
2759 if (!priv)
2760 return ERR_PTR(-ENOMEM);
2761
2762 priv->phy = phy;
2763 priv->phy_ops = phy_ops;
2764 priv->dev = dev;
2765 if (fops != NULL)
2766 priv->ops = fops;
2767 else
2768 priv->ops = &pn533_std_frame_ops;
2769
2770 priv->protocol_type = protocol_type;
2771 priv->device_type = device_type;
2772
2773 mutex_init(&priv->cmd_lock);
2774
2775 INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2776 INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2777 INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2778 INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2779 INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2780 INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2781 INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2782 INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2783 INIT_WORK(&priv->rf_work, pn533_wq_rf);
2784 priv->wq = alloc_ordered_workqueue("pn533", 0);
2785 if (priv->wq == NULL)
2786 goto error;
2787
2788 timer_setup(&priv->listen_timer, pn533_listen_mode_timer, 0);
2789
2790 skb_queue_head_init(&priv->resp_q);
2791 skb_queue_head_init(&priv->fragment_skb);
2792
2793 INIT_LIST_HEAD(&priv->cmd_queue);
2794 return priv;
2795
2796 error:
2797 kfree(priv);
2798 return ERR_PTR(-ENOMEM);
2799 }
2800 EXPORT_SYMBOL_GPL(pn53x_common_init);
2801
pn53x_common_clean(struct pn533 * priv)2802 void pn53x_common_clean(struct pn533 *priv)
2803 {
2804 struct pn533_cmd *cmd, *n;
2805
2806 /* delete the timer before cleanup the worker */
2807 timer_shutdown_sync(&priv->listen_timer);
2808
2809 flush_delayed_work(&priv->poll_work);
2810 destroy_workqueue(priv->wq);
2811
2812 skb_queue_purge(&priv->resp_q);
2813 skb_queue_purge(&priv->fragment_skb);
2814
2815 list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2816 list_del(&cmd->queue);
2817 kfree(cmd);
2818 }
2819
2820 kfree(priv);
2821 }
2822 EXPORT_SYMBOL_GPL(pn53x_common_clean);
2823
pn532_i2c_nfc_alloc(struct pn533 * priv,u32 protocols,struct device * parent)2824 int pn532_i2c_nfc_alloc(struct pn533 *priv, u32 protocols,
2825 struct device *parent)
2826 {
2827 priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2828 priv->ops->tx_header_len +
2829 PN533_CMD_DATAEXCH_HEAD_LEN,
2830 priv->ops->tx_tail_len);
2831 if (!priv->nfc_dev)
2832 return -ENOMEM;
2833
2834 nfc_set_parent_dev(priv->nfc_dev, parent);
2835 nfc_set_drvdata(priv->nfc_dev, priv);
2836 return 0;
2837 }
2838 EXPORT_SYMBOL_GPL(pn532_i2c_nfc_alloc);
2839
pn53x_register_nfc(struct pn533 * priv,u32 protocols,struct device * parent)2840 int pn53x_register_nfc(struct pn533 *priv, u32 protocols,
2841 struct device *parent)
2842 {
2843 int rc;
2844
2845 rc = pn532_i2c_nfc_alloc(priv, protocols, parent);
2846 if (rc)
2847 return rc;
2848
2849 rc = nfc_register_device(priv->nfc_dev);
2850 if (rc)
2851 nfc_free_device(priv->nfc_dev);
2852
2853 return rc;
2854 }
2855 EXPORT_SYMBOL_GPL(pn53x_register_nfc);
2856
pn53x_unregister_nfc(struct pn533 * priv)2857 void pn53x_unregister_nfc(struct pn533 *priv)
2858 {
2859 nfc_unregister_device(priv->nfc_dev);
2860 nfc_free_device(priv->nfc_dev);
2861 }
2862 EXPORT_SYMBOL_GPL(pn53x_unregister_nfc);
2863
2864 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
2865 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2866 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
2867 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2868 MODULE_VERSION(VERSION);
2869 MODULE_LICENSE("GPL");
2870