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_async(struct pn533 * dev,u8 cmd_code,struct sk_buff * req,pn533_send_async_complete_t complete_cb,void * complete_cb_context)437 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
438 struct sk_buff *req,
439 pn533_send_async_complete_t complete_cb,
440 void *complete_cb_context)
441 {
442 struct pn533_cmd *cmd;
443 int rc = 0;
444
445 dev_dbg(dev->dev, "Sending command 0x%x\n", cmd_code);
446
447 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
448 if (!cmd)
449 return -ENOMEM;
450
451 cmd->code = cmd_code;
452 cmd->req = req;
453 cmd->complete_cb = complete_cb;
454 cmd->complete_cb_context = complete_cb_context;
455
456 pn533_build_cmd_frame(dev, cmd_code, req);
457
458 mutex_lock(&dev->cmd_lock);
459
460 if (!dev->cmd_pending) {
461 dev->cmd = cmd;
462 rc = dev->phy_ops->send_frame(dev, req);
463 if (rc) {
464 dev->cmd = NULL;
465 goto error;
466 }
467
468 dev->cmd_pending = 1;
469 goto unlock;
470 }
471
472 dev_dbg(dev->dev, "%s Queueing command 0x%x\n",
473 __func__, cmd_code);
474
475 INIT_LIST_HEAD(&cmd->queue);
476 list_add_tail(&cmd->queue, &dev->cmd_queue);
477
478 goto unlock;
479
480 error:
481 kfree(cmd);
482 unlock:
483 mutex_unlock(&dev->cmd_lock);
484 return rc;
485 }
486
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)487 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
488 struct sk_buff *req,
489 pn533_send_async_complete_t complete_cb,
490 void *complete_cb_context)
491 {
492 int rc;
493
494 rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
495 complete_cb_context);
496
497 return rc;
498 }
499
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)500 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
501 struct sk_buff *req,
502 pn533_send_async_complete_t complete_cb,
503 void *complete_cb_context)
504 {
505 int rc;
506
507 rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
508 complete_cb_context);
509
510 return rc;
511 }
512
513 /*
514 * pn533_send_cmd_direct_async
515 *
516 * The function sends a piority cmd directly to the chip omitting the cmd
517 * queue. It's intended to be used by chaining mechanism of received responses
518 * where the host has to request every single chunk of data before scheduling
519 * next cmd from the queue.
520 */
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)521 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
522 struct sk_buff *req,
523 pn533_send_async_complete_t complete_cb,
524 void *complete_cb_context)
525 {
526 struct pn533_cmd *cmd;
527 int rc;
528
529 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
530 if (!cmd)
531 return -ENOMEM;
532
533 cmd->code = cmd_code;
534 cmd->req = req;
535 cmd->complete_cb = complete_cb;
536 cmd->complete_cb_context = complete_cb_context;
537
538 pn533_build_cmd_frame(dev, cmd_code, req);
539
540 dev->cmd = cmd;
541 rc = dev->phy_ops->send_frame(dev, req);
542 if (rc < 0) {
543 dev->cmd = NULL;
544 kfree(cmd);
545 }
546
547 return rc;
548 }
549
pn533_wq_cmd_complete(struct work_struct * work)550 static void pn533_wq_cmd_complete(struct work_struct *work)
551 {
552 struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
553 int rc;
554
555 rc = pn533_send_async_complete(dev);
556 if (rc != -EINPROGRESS)
557 queue_work(dev->wq, &dev->cmd_work);
558 }
559
pn533_wq_cmd(struct work_struct * work)560 static void pn533_wq_cmd(struct work_struct *work)
561 {
562 struct pn533 *dev = container_of(work, struct pn533, cmd_work);
563 struct pn533_cmd *cmd;
564 int rc;
565
566 mutex_lock(&dev->cmd_lock);
567
568 if (list_empty(&dev->cmd_queue)) {
569 dev->cmd_pending = 0;
570 mutex_unlock(&dev->cmd_lock);
571 return;
572 }
573
574 cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
575
576 list_del(&cmd->queue);
577
578 mutex_unlock(&dev->cmd_lock);
579
580 dev->cmd = cmd;
581 rc = dev->phy_ops->send_frame(dev, cmd->req);
582 if (rc < 0) {
583 dev->cmd = NULL;
584 dev_kfree_skb(cmd->req);
585 kfree(cmd);
586 return;
587 }
588
589 }
590
591 struct pn533_sync_cmd_response {
592 struct sk_buff *resp;
593 struct completion done;
594 };
595
pn533_send_sync_complete(struct pn533 * dev,void * _arg,struct sk_buff * resp)596 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
597 struct sk_buff *resp)
598 {
599 struct pn533_sync_cmd_response *arg = _arg;
600
601 arg->resp = resp;
602 complete(&arg->done);
603
604 return 0;
605 }
606
607 /* pn533_send_cmd_sync
608 *
609 * Please note the req parameter is freed inside the function to
610 * limit a number of return value interpretations by the caller.
611 *
612 * 1. negative in case of error during TX path -> req should be freed
613 *
614 * 2. negative in case of error during RX path -> req should not be freed
615 * as it's been already freed at the beginning of RX path by
616 * async_complete_cb.
617 *
618 * 3. valid pointer in case of succesfult RX path
619 *
620 * A caller has to check a return value with IS_ERR macro. If the test pass,
621 * the returned pointer is valid.
622 *
623 */
pn533_send_cmd_sync(struct pn533 * dev,u8 cmd_code,struct sk_buff * req)624 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
625 struct sk_buff *req)
626 {
627 int rc;
628 struct pn533_sync_cmd_response arg;
629
630 init_completion(&arg.done);
631
632 rc = pn533_send_cmd_async(dev, cmd_code, req,
633 pn533_send_sync_complete, &arg);
634 if (rc) {
635 dev_kfree_skb(req);
636 return ERR_PTR(rc);
637 }
638
639 wait_for_completion(&arg.done);
640
641 return arg.resp;
642 }
643
pn533_alloc_skb(struct pn533 * dev,unsigned int size)644 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
645 {
646 struct sk_buff *skb;
647
648 skb = alloc_skb(dev->ops->tx_header_len +
649 size +
650 dev->ops->tx_tail_len, GFP_KERNEL);
651
652 if (skb)
653 skb_reserve(skb, dev->ops->tx_header_len);
654
655 return skb;
656 }
657
658 struct pn533_target_type_a {
659 __be16 sens_res;
660 u8 sel_res;
661 u8 nfcid_len;
662 u8 nfcid_data[];
663 } __packed;
664
665
666 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
667 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
668 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
669
670 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
671 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
672
673 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
674 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
675
676 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
677 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
678 #define PN533_TYPE_A_SEL_PROT_DEP 2
679 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
680
pn533_target_type_a_is_valid(struct pn533_target_type_a * type_a,int target_data_len)681 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
682 int target_data_len)
683 {
684 u8 ssd;
685 u8 platconf;
686
687 if (target_data_len < sizeof(struct pn533_target_type_a))
688 return false;
689
690 /*
691 * The length check of nfcid[] and ats[] are not being performed because
692 * the values are not being used
693 */
694
695 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
696 ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
697 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
698
699 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
700 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
701 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
702 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
703 return false;
704
705 /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
706 if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
707 return false;
708
709 if (type_a->nfcid_len > NFC_NFCID1_MAXSIZE)
710 return false;
711
712 return true;
713 }
714
pn533_target_found_type_a(struct nfc_target * nfc_tgt,u8 * tgt_data,int tgt_data_len)715 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
716 int tgt_data_len)
717 {
718 struct pn533_target_type_a *tgt_type_a;
719
720 tgt_type_a = (struct pn533_target_type_a *)tgt_data;
721
722 if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
723 return -EPROTO;
724
725 switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
726 case PN533_TYPE_A_SEL_PROT_MIFARE:
727 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
728 break;
729 case PN533_TYPE_A_SEL_PROT_ISO14443:
730 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
731 break;
732 case PN533_TYPE_A_SEL_PROT_DEP:
733 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
734 break;
735 case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
736 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
737 NFC_PROTO_NFC_DEP_MASK;
738 break;
739 }
740
741 nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
742 nfc_tgt->sel_res = tgt_type_a->sel_res;
743 nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
744 memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
745
746 return 0;
747 }
748
749 struct pn533_target_felica {
750 u8 pol_res;
751 u8 opcode;
752 u8 nfcid2[NFC_NFCID2_MAXSIZE];
753 u8 pad[8];
754 /* optional */
755 u8 syst_code[];
756 } __packed;
757
758 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
759 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
760
pn533_target_felica_is_valid(struct pn533_target_felica * felica,int target_data_len)761 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
762 int target_data_len)
763 {
764 if (target_data_len < sizeof(struct pn533_target_felica))
765 return false;
766
767 if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
768 return false;
769
770 return true;
771 }
772
pn533_target_found_felica(struct nfc_target * nfc_tgt,u8 * tgt_data,int tgt_data_len)773 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
774 int tgt_data_len)
775 {
776 struct pn533_target_felica *tgt_felica;
777
778 tgt_felica = (struct pn533_target_felica *)tgt_data;
779
780 if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
781 return -EPROTO;
782
783 if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
784 (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
785 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
786 else
787 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
788
789 memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
790 nfc_tgt->sensf_res_len = 9;
791
792 memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
793 nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
794
795 return 0;
796 }
797
798 struct pn533_target_jewel {
799 __be16 sens_res;
800 u8 jewelid[4];
801 } __packed;
802
pn533_target_jewel_is_valid(struct pn533_target_jewel * jewel,int target_data_len)803 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
804 int target_data_len)
805 {
806 u8 ssd;
807 u8 platconf;
808
809 if (target_data_len < sizeof(struct pn533_target_jewel))
810 return false;
811
812 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
813 ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
814 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
815
816 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
817 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
818 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
819 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
820 return false;
821
822 return true;
823 }
824
pn533_target_found_jewel(struct nfc_target * nfc_tgt,u8 * tgt_data,int tgt_data_len)825 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
826 int tgt_data_len)
827 {
828 struct pn533_target_jewel *tgt_jewel;
829
830 tgt_jewel = (struct pn533_target_jewel *)tgt_data;
831
832 if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
833 return -EPROTO;
834
835 nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
836 nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
837 nfc_tgt->nfcid1_len = 4;
838 memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
839
840 return 0;
841 }
842
843 struct pn533_type_b_prot_info {
844 u8 bitrate;
845 u8 fsci_type;
846 u8 fwi_adc_fo;
847 } __packed;
848
849 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
850 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
851 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
852
853 struct pn533_type_b_sens_res {
854 u8 opcode;
855 u8 nfcid[4];
856 u8 appdata[4];
857 struct pn533_type_b_prot_info prot_info;
858 } __packed;
859
860 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
861
862 struct pn533_target_type_b {
863 struct pn533_type_b_sens_res sensb_res;
864 u8 attrib_res_len;
865 u8 attrib_res[];
866 } __packed;
867
pn533_target_type_b_is_valid(struct pn533_target_type_b * type_b,int target_data_len)868 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
869 int target_data_len)
870 {
871 if (target_data_len < sizeof(struct pn533_target_type_b))
872 return false;
873
874 if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
875 return false;
876
877 if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
878 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
879 return false;
880
881 return true;
882 }
883
pn533_target_found_type_b(struct nfc_target * nfc_tgt,u8 * tgt_data,int tgt_data_len)884 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
885 int tgt_data_len)
886 {
887 struct pn533_target_type_b *tgt_type_b;
888
889 tgt_type_b = (struct pn533_target_type_b *)tgt_data;
890
891 if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
892 return -EPROTO;
893
894 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
895
896 return 0;
897 }
898
899 static void pn533_poll_reset_mod_list(struct pn533 *dev);
pn533_target_found(struct pn533 * dev,u8 tg,u8 * tgdata,int tgdata_len)900 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
901 int tgdata_len)
902 {
903 struct nfc_target nfc_tgt;
904 int rc;
905
906 dev_dbg(dev->dev, "%s: modulation=%d\n",
907 __func__, dev->poll_mod_curr);
908
909 if (tg != 1)
910 return -EPROTO;
911
912 memset(&nfc_tgt, 0, sizeof(struct nfc_target));
913
914 switch (dev->poll_mod_curr) {
915 case PN533_POLL_MOD_106KBPS_A:
916 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
917 break;
918 case PN533_POLL_MOD_212KBPS_FELICA:
919 case PN533_POLL_MOD_424KBPS_FELICA:
920 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
921 break;
922 case PN533_POLL_MOD_106KBPS_JEWEL:
923 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
924 break;
925 case PN533_POLL_MOD_847KBPS_B:
926 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
927 break;
928 default:
929 nfc_err(dev->dev,
930 "Unknown current poll modulation\n");
931 return -EPROTO;
932 }
933
934 if (rc)
935 return rc;
936
937 if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
938 dev_dbg(dev->dev,
939 "The Tg found doesn't have the desired protocol\n");
940 return -EAGAIN;
941 }
942
943 dev_dbg(dev->dev,
944 "Target found - supported protocols: 0x%x\n",
945 nfc_tgt.supported_protocols);
946
947 dev->tgt_available_prots = nfc_tgt.supported_protocols;
948
949 pn533_poll_reset_mod_list(dev);
950 nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
951
952 return 0;
953 }
954
pn533_poll_next_mod(struct pn533 * dev)955 static inline void pn533_poll_next_mod(struct pn533 *dev)
956 {
957 dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
958 }
959
pn533_poll_reset_mod_list(struct pn533 * dev)960 static void pn533_poll_reset_mod_list(struct pn533 *dev)
961 {
962 dev->poll_mod_count = 0;
963 }
964
pn533_poll_add_mod(struct pn533 * dev,u8 mod_index)965 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
966 {
967 dev->poll_mod_active[dev->poll_mod_count] =
968 (struct pn533_poll_modulations *)&poll_mod[mod_index];
969 dev->poll_mod_count++;
970 }
971
pn533_poll_create_mod_list(struct pn533 * dev,u32 im_protocols,u32 tm_protocols)972 static void pn533_poll_create_mod_list(struct pn533 *dev,
973 u32 im_protocols, u32 tm_protocols)
974 {
975 pn533_poll_reset_mod_list(dev);
976
977 if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
978 (im_protocols & NFC_PROTO_ISO14443_MASK) ||
979 (im_protocols & NFC_PROTO_NFC_DEP_MASK))
980 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
981
982 if (im_protocols & NFC_PROTO_FELICA_MASK ||
983 im_protocols & NFC_PROTO_NFC_DEP_MASK) {
984 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
985 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
986 }
987
988 if (im_protocols & NFC_PROTO_JEWEL_MASK)
989 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
990
991 if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
992 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
993
994 if (tm_protocols)
995 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
996 }
997
pn533_start_poll_complete(struct pn533 * dev,struct sk_buff * resp)998 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
999 {
1000 u8 nbtg, tg, *tgdata;
1001 int rc, tgdata_len;
1002
1003 /* Toggle the DEP polling */
1004 if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK)
1005 dev->poll_dep = 1;
1006
1007 nbtg = resp->data[0];
1008 tg = resp->data[1];
1009 tgdata = &resp->data[2];
1010 tgdata_len = resp->len - 2; /* nbtg + tg */
1011
1012 if (nbtg) {
1013 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1014
1015 /* We must stop the poll after a valid target found */
1016 if (rc == 0)
1017 return 0;
1018 }
1019
1020 return -EAGAIN;
1021 }
1022
pn533_alloc_poll_tg_frame(struct pn533 * dev)1023 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1024 {
1025 struct sk_buff *skb;
1026 u8 *felica, *nfcid3;
1027
1028 u8 *gbytes = dev->gb;
1029 size_t gbytes_len = dev->gb_len;
1030
1031 u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1032 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1033 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1034 0xff, 0xff}; /* System code */
1035
1036 u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1037 0x0, 0x0, 0x0,
1038 0x40}; /* SEL_RES for DEP */
1039
1040 unsigned int skb_len = 36 + /*
1041 * mode (1), mifare (6),
1042 * felica (18), nfcid3 (10), gb_len (1)
1043 */
1044 gbytes_len +
1045 1; /* len Tk*/
1046
1047 skb = pn533_alloc_skb(dev, skb_len);
1048 if (!skb)
1049 return NULL;
1050
1051 /* DEP support only */
1052 skb_put_u8(skb, PN533_INIT_TARGET_DEP);
1053
1054 /* MIFARE params */
1055 skb_put_data(skb, mifare_params, 6);
1056
1057 /* Felica params */
1058 felica = skb_put_data(skb, felica_params, 18);
1059 get_random_bytes(felica + 2, 6);
1060
1061 /* NFCID3 */
1062 nfcid3 = skb_put_zero(skb, 10);
1063 memcpy(nfcid3, felica, 8);
1064
1065 /* General bytes */
1066 skb_put_u8(skb, gbytes_len);
1067
1068 skb_put_data(skb, gbytes, gbytes_len);
1069
1070 /* Len Tk */
1071 skb_put_u8(skb, 0);
1072
1073 return skb;
1074 }
1075
1076 static void pn533_wq_tm_mi_recv(struct work_struct *work);
1077 static struct sk_buff *pn533_build_response(struct pn533 *dev);
1078
pn533_tm_get_data_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1079 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1080 struct sk_buff *resp)
1081 {
1082 struct sk_buff *skb;
1083 u8 status, ret, mi;
1084 int rc;
1085
1086 dev_dbg(dev->dev, "%s\n", __func__);
1087
1088 if (IS_ERR(resp)) {
1089 skb_queue_purge(&dev->resp_q);
1090 return PTR_ERR(resp);
1091 }
1092
1093 status = resp->data[0];
1094
1095 ret = status & PN533_CMD_RET_MASK;
1096 mi = status & PN533_CMD_MI_MASK;
1097
1098 skb_pull(resp, sizeof(status));
1099
1100 if (ret != PN533_CMD_RET_SUCCESS) {
1101 rc = -EIO;
1102 goto error;
1103 }
1104
1105 skb_queue_tail(&dev->resp_q, resp);
1106
1107 if (mi) {
1108 queue_work(dev->wq, &dev->mi_tm_rx_work);
1109 return -EINPROGRESS;
1110 }
1111
1112 skb = pn533_build_response(dev);
1113 if (!skb) {
1114 rc = -EIO;
1115 goto error;
1116 }
1117
1118 return nfc_tm_data_received(dev->nfc_dev, skb);
1119
1120 error:
1121 nfc_tm_deactivated(dev->nfc_dev);
1122 dev->tgt_mode = 0;
1123 skb_queue_purge(&dev->resp_q);
1124 dev_kfree_skb(resp);
1125
1126 return rc;
1127 }
1128
pn533_wq_tm_mi_recv(struct work_struct * work)1129 static void pn533_wq_tm_mi_recv(struct work_struct *work)
1130 {
1131 struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work);
1132 struct sk_buff *skb;
1133 int rc;
1134
1135 dev_dbg(dev->dev, "%s\n", __func__);
1136
1137 skb = pn533_alloc_skb(dev, 0);
1138 if (!skb)
1139 return;
1140
1141 rc = pn533_send_cmd_direct_async(dev,
1142 PN533_CMD_TG_GET_DATA,
1143 skb,
1144 pn533_tm_get_data_complete,
1145 NULL);
1146
1147 if (rc < 0)
1148 dev_kfree_skb(skb);
1149 }
1150
1151 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
1152 struct sk_buff *resp);
pn533_wq_tm_mi_send(struct work_struct * work)1153 static void pn533_wq_tm_mi_send(struct work_struct *work)
1154 {
1155 struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
1156 struct sk_buff *skb;
1157 int rc;
1158
1159 dev_dbg(dev->dev, "%s\n", __func__);
1160
1161 /* Grab the first skb in the queue */
1162 skb = skb_dequeue(&dev->fragment_skb);
1163 if (skb == NULL) { /* No more data */
1164 /* Reset the queue for future use */
1165 skb_queue_head_init(&dev->fragment_skb);
1166 goto error;
1167 }
1168
1169 /* last entry - remove MI bit */
1170 if (skb_queue_len(&dev->fragment_skb) == 0) {
1171 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
1172 skb, pn533_tm_send_complete, NULL);
1173 } else
1174 rc = pn533_send_cmd_direct_async(dev,
1175 PN533_CMD_TG_SET_META_DATA,
1176 skb, pn533_tm_send_complete, NULL);
1177
1178 if (rc == 0) /* success */
1179 return;
1180
1181 dev_err(dev->dev,
1182 "Error %d when trying to perform set meta data_exchange", rc);
1183
1184 dev_kfree_skb(skb);
1185
1186 error:
1187 dev->phy_ops->send_ack(dev, GFP_KERNEL);
1188 queue_work(dev->wq, &dev->cmd_work);
1189 }
1190
pn533_wq_tg_get_data(struct work_struct * work)1191 static void pn533_wq_tg_get_data(struct work_struct *work)
1192 {
1193 struct pn533 *dev = container_of(work, struct pn533, tg_work);
1194 struct sk_buff *skb;
1195 int rc;
1196
1197 dev_dbg(dev->dev, "%s\n", __func__);
1198
1199 skb = pn533_alloc_skb(dev, 0);
1200 if (!skb)
1201 return;
1202
1203 rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1204 pn533_tm_get_data_complete, NULL);
1205
1206 if (rc < 0)
1207 dev_kfree_skb(skb);
1208 }
1209
1210 #define ATR_REQ_GB_OFFSET 17
pn533_init_target_complete(struct pn533 * dev,struct sk_buff * resp)1211 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1212 {
1213 u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1214 size_t gb_len;
1215 int rc;
1216
1217 dev_dbg(dev->dev, "%s\n", __func__);
1218
1219 if (resp->len < ATR_REQ_GB_OFFSET + 1)
1220 return -EINVAL;
1221
1222 mode = resp->data[0];
1223 cmd = &resp->data[1];
1224
1225 dev_dbg(dev->dev, "Target mode 0x%x len %d\n",
1226 mode, resp->len);
1227
1228 if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1229 PN533_INIT_TARGET_RESP_ACTIVE)
1230 comm_mode = NFC_COMM_ACTIVE;
1231
1232 if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0) /* Only DEP supported */
1233 return -EOPNOTSUPP;
1234
1235 gb = cmd + ATR_REQ_GB_OFFSET;
1236 gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1237
1238 rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1239 comm_mode, gb, gb_len);
1240 if (rc < 0) {
1241 nfc_err(dev->dev,
1242 "Error when signaling target activation\n");
1243 return rc;
1244 }
1245
1246 dev->tgt_mode = 1;
1247 queue_work(dev->wq, &dev->tg_work);
1248
1249 return 0;
1250 }
1251
pn533_listen_mode_timer(struct timer_list * t)1252 static void pn533_listen_mode_timer(struct timer_list *t)
1253 {
1254 struct pn533 *dev = from_timer(dev, t, listen_timer);
1255
1256 dev_dbg(dev->dev, "Listen mode timeout\n");
1257
1258 dev->cancel_listen = 1;
1259
1260 pn533_poll_next_mod(dev);
1261
1262 queue_delayed_work(dev->wq, &dev->poll_work,
1263 msecs_to_jiffies(PN533_POLL_INTERVAL));
1264 }
1265
pn533_rf_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1266 static int pn533_rf_complete(struct pn533 *dev, void *arg,
1267 struct sk_buff *resp)
1268 {
1269 int rc = 0;
1270
1271 dev_dbg(dev->dev, "%s\n", __func__);
1272
1273 if (IS_ERR(resp)) {
1274 rc = PTR_ERR(resp);
1275
1276 nfc_err(dev->dev, "RF setting error %d\n", rc);
1277
1278 return rc;
1279 }
1280
1281 queue_delayed_work(dev->wq, &dev->poll_work,
1282 msecs_to_jiffies(PN533_POLL_INTERVAL));
1283
1284 dev_kfree_skb(resp);
1285 return rc;
1286 }
1287
pn533_wq_rf(struct work_struct * work)1288 static void pn533_wq_rf(struct work_struct *work)
1289 {
1290 struct pn533 *dev = container_of(work, struct pn533, rf_work);
1291 struct sk_buff *skb;
1292 int rc;
1293
1294 dev_dbg(dev->dev, "%s\n", __func__);
1295
1296 skb = pn533_alloc_skb(dev, 2);
1297 if (!skb)
1298 return;
1299
1300 skb_put_u8(skb, PN533_CFGITEM_RF_FIELD);
1301 skb_put_u8(skb, PN533_CFGITEM_RF_FIELD_AUTO_RFCA);
1302
1303 rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1304 pn533_rf_complete, NULL);
1305 if (rc < 0) {
1306 dev_kfree_skb(skb);
1307 nfc_err(dev->dev, "RF setting error %d\n", rc);
1308 }
1309 }
1310
pn533_poll_dep_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1311 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg,
1312 struct sk_buff *resp)
1313 {
1314 struct pn533_cmd_jump_dep_response *rsp;
1315 struct nfc_target nfc_target;
1316 u8 target_gt_len;
1317 int rc;
1318
1319 if (IS_ERR(resp))
1320 return PTR_ERR(resp);
1321
1322 memset(&nfc_target, 0, sizeof(struct nfc_target));
1323
1324 rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1325
1326 rc = rsp->status & PN533_CMD_RET_MASK;
1327 if (rc != PN533_CMD_RET_SUCCESS) {
1328 /* Not target found, turn radio off */
1329 queue_work(dev->wq, &dev->rf_work);
1330
1331 dev_kfree_skb(resp);
1332 return 0;
1333 }
1334
1335 dev_dbg(dev->dev, "Creating new target");
1336
1337 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1338 nfc_target.nfcid1_len = 10;
1339 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1340 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1341 if (rc)
1342 goto error;
1343
1344 dev->tgt_available_prots = 0;
1345 dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1346
1347 /* ATR_RES general bytes are located at offset 17 */
1348 target_gt_len = resp->len - 17;
1349 rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1350 rsp->gt, target_gt_len);
1351 if (!rc) {
1352 rc = nfc_dep_link_is_up(dev->nfc_dev,
1353 dev->nfc_dev->targets[0].idx,
1354 0, NFC_RF_INITIATOR);
1355
1356 if (!rc)
1357 pn533_poll_reset_mod_list(dev);
1358 }
1359 error:
1360 dev_kfree_skb(resp);
1361 return rc;
1362 }
1363
1364 #define PASSIVE_DATA_LEN 5
pn533_poll_dep(struct nfc_dev * nfc_dev)1365 static int pn533_poll_dep(struct nfc_dev *nfc_dev)
1366 {
1367 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1368 struct sk_buff *skb;
1369 int rc, skb_len;
1370 u8 *next, nfcid3[NFC_NFCID3_MAXSIZE];
1371 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1372
1373 dev_dbg(dev->dev, "%s", __func__);
1374
1375 if (!dev->gb) {
1376 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1377
1378 if (!dev->gb || !dev->gb_len) {
1379 dev->poll_dep = 0;
1380 queue_work(dev->wq, &dev->rf_work);
1381 }
1382 }
1383
1384 skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1385 skb_len += PASSIVE_DATA_LEN;
1386
1387 /* NFCID3 */
1388 skb_len += NFC_NFCID3_MAXSIZE;
1389 nfcid3[0] = 0x1;
1390 nfcid3[1] = 0xfe;
1391 get_random_bytes(nfcid3 + 2, 6);
1392
1393 skb = pn533_alloc_skb(dev, skb_len);
1394 if (!skb)
1395 return -ENOMEM;
1396
1397 skb_put_u8(skb, 0x01); /* Active */
1398 skb_put_u8(skb, 0x02); /* 424 kbps */
1399
1400 next = skb_put(skb, 1); /* Next */
1401 *next = 0;
1402
1403 /* Copy passive data */
1404 skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
1405 *next |= 1;
1406
1407 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1408 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
1409 *next |= 2;
1410
1411 skb_put_data(skb, dev->gb, dev->gb_len);
1412 *next |= 4; /* We have some Gi */
1413
1414 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1415 pn533_poll_dep_complete, NULL);
1416
1417 if (rc < 0)
1418 dev_kfree_skb(skb);
1419
1420 return rc;
1421 }
1422
pn533_autopoll_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1423 static int pn533_autopoll_complete(struct pn533 *dev, void *arg,
1424 struct sk_buff *resp)
1425 {
1426 struct pn532_autopoll_resp *apr;
1427 struct nfc_target nfc_tgt;
1428 u8 nbtg;
1429 int rc;
1430
1431 if (IS_ERR(resp)) {
1432 rc = PTR_ERR(resp);
1433
1434 nfc_err(dev->dev, "%s autopoll complete error %d\n",
1435 __func__, rc);
1436
1437 if (rc == -ENOENT) {
1438 if (dev->poll_mod_count != 0)
1439 return rc;
1440 goto stop_poll;
1441 } else if (rc < 0) {
1442 nfc_err(dev->dev,
1443 "Error %d when running autopoll\n", rc);
1444 goto stop_poll;
1445 }
1446 }
1447
1448 nbtg = resp->data[0];
1449 if ((nbtg > 2) || (nbtg <= 0))
1450 return -EAGAIN;
1451
1452 apr = (struct pn532_autopoll_resp *)&resp->data[1];
1453 while (nbtg--) {
1454 memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1455 switch (apr->type) {
1456 case PN532_AUTOPOLL_TYPE_ISOA:
1457 dev_dbg(dev->dev, "ISOA\n");
1458 rc = pn533_target_found_type_a(&nfc_tgt, apr->tgdata,
1459 apr->ln - 1);
1460 break;
1461 case PN532_AUTOPOLL_TYPE_FELICA212:
1462 case PN532_AUTOPOLL_TYPE_FELICA424:
1463 dev_dbg(dev->dev, "FELICA\n");
1464 rc = pn533_target_found_felica(&nfc_tgt, apr->tgdata,
1465 apr->ln - 1);
1466 break;
1467 case PN532_AUTOPOLL_TYPE_JEWEL:
1468 dev_dbg(dev->dev, "JEWEL\n");
1469 rc = pn533_target_found_jewel(&nfc_tgt, apr->tgdata,
1470 apr->ln - 1);
1471 break;
1472 case PN532_AUTOPOLL_TYPE_ISOB:
1473 dev_dbg(dev->dev, "ISOB\n");
1474 rc = pn533_target_found_type_b(&nfc_tgt, apr->tgdata,
1475 apr->ln - 1);
1476 break;
1477 case PN532_AUTOPOLL_TYPE_MIFARE:
1478 dev_dbg(dev->dev, "Mifare\n");
1479 rc = pn533_target_found_type_a(&nfc_tgt, apr->tgdata,
1480 apr->ln - 1);
1481 break;
1482 default:
1483 nfc_err(dev->dev,
1484 "Unknown current poll modulation\n");
1485 rc = -EPROTO;
1486 }
1487
1488 if (rc)
1489 goto done;
1490
1491 if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1492 nfc_err(dev->dev,
1493 "The Tg found doesn't have the desired protocol\n");
1494 rc = -EAGAIN;
1495 goto done;
1496 }
1497
1498 dev->tgt_available_prots = nfc_tgt.supported_protocols;
1499 apr = (struct pn532_autopoll_resp *)
1500 (apr->tgdata + (apr->ln - 1));
1501 }
1502
1503 pn533_poll_reset_mod_list(dev);
1504 nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1505
1506 done:
1507 dev_kfree_skb(resp);
1508 return rc;
1509
1510 stop_poll:
1511 nfc_err(dev->dev, "autopoll operation has been stopped\n");
1512
1513 pn533_poll_reset_mod_list(dev);
1514 dev->poll_protocols = 0;
1515 return rc;
1516 }
1517
pn533_poll_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1518 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1519 struct sk_buff *resp)
1520 {
1521 struct pn533_poll_modulations *cur_mod;
1522 int rc;
1523
1524 dev_dbg(dev->dev, "%s\n", __func__);
1525
1526 if (IS_ERR(resp)) {
1527 rc = PTR_ERR(resp);
1528
1529 nfc_err(dev->dev, "%s Poll complete error %d\n",
1530 __func__, rc);
1531
1532 if (rc == -ENOENT) {
1533 if (dev->poll_mod_count != 0)
1534 return rc;
1535 goto stop_poll;
1536 } else if (rc < 0) {
1537 nfc_err(dev->dev,
1538 "Error %d when running poll\n", rc);
1539 goto stop_poll;
1540 }
1541 }
1542
1543 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1544
1545 if (cur_mod->len == 0) { /* Target mode */
1546 del_timer(&dev->listen_timer);
1547 rc = pn533_init_target_complete(dev, resp);
1548 goto done;
1549 }
1550
1551 /* Initiator mode */
1552 rc = pn533_start_poll_complete(dev, resp);
1553 if (!rc)
1554 goto done;
1555
1556 if (!dev->poll_mod_count) {
1557 dev_dbg(dev->dev, "Polling has been stopped\n");
1558 goto done;
1559 }
1560
1561 pn533_poll_next_mod(dev);
1562 /* Not target found, turn radio off */
1563 queue_work(dev->wq, &dev->rf_work);
1564
1565 done:
1566 dev_kfree_skb(resp);
1567 return rc;
1568
1569 stop_poll:
1570 nfc_err(dev->dev, "Polling operation has been stopped\n");
1571
1572 pn533_poll_reset_mod_list(dev);
1573 dev->poll_protocols = 0;
1574 return rc;
1575 }
1576
pn533_alloc_poll_in_frame(struct pn533 * dev,struct pn533_poll_modulations * mod)1577 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1578 struct pn533_poll_modulations *mod)
1579 {
1580 struct sk_buff *skb;
1581
1582 skb = pn533_alloc_skb(dev, mod->len);
1583 if (!skb)
1584 return NULL;
1585
1586 skb_put_data(skb, &mod->data, mod->len);
1587
1588 return skb;
1589 }
1590
pn533_send_poll_frame(struct pn533 * dev)1591 static int pn533_send_poll_frame(struct pn533 *dev)
1592 {
1593 struct pn533_poll_modulations *mod;
1594 struct sk_buff *skb;
1595 int rc;
1596 u8 cmd_code;
1597
1598 mod = dev->poll_mod_active[dev->poll_mod_curr];
1599
1600 dev_dbg(dev->dev, "%s mod len %d\n",
1601 __func__, mod->len);
1602
1603 if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep) {
1604 dev->poll_dep = 0;
1605 return pn533_poll_dep(dev->nfc_dev);
1606 }
1607
1608 if (mod->len == 0) { /* Listen mode */
1609 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1610 skb = pn533_alloc_poll_tg_frame(dev);
1611 } else { /* Polling mode */
1612 cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET;
1613 skb = pn533_alloc_poll_in_frame(dev, mod);
1614 }
1615
1616 if (!skb) {
1617 nfc_err(dev->dev, "Failed to allocate skb\n");
1618 return -ENOMEM;
1619 }
1620
1621 rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1622 NULL);
1623 if (rc < 0) {
1624 dev_kfree_skb(skb);
1625 nfc_err(dev->dev, "Polling loop error %d\n", rc);
1626 }
1627
1628 return rc;
1629 }
1630
pn533_wq_poll(struct work_struct * work)1631 static void pn533_wq_poll(struct work_struct *work)
1632 {
1633 struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1634 struct pn533_poll_modulations *cur_mod;
1635 int rc;
1636
1637 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1638
1639 dev_dbg(dev->dev,
1640 "%s cancel_listen %d modulation len %d\n",
1641 __func__, dev->cancel_listen, cur_mod->len);
1642
1643 if (dev->cancel_listen == 1) {
1644 dev->cancel_listen = 0;
1645 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC);
1646 }
1647
1648 rc = pn533_send_poll_frame(dev);
1649 if (rc)
1650 return;
1651
1652 if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1653 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1654 }
1655
pn533_start_poll(struct nfc_dev * nfc_dev,u32 im_protocols,u32 tm_protocols)1656 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1657 u32 im_protocols, u32 tm_protocols)
1658 {
1659 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1660 struct pn533_poll_modulations *cur_mod;
1661 struct sk_buff *skb;
1662 u8 rand_mod;
1663 int rc;
1664
1665 dev_dbg(dev->dev,
1666 "%s: im protocols 0x%x tm protocols 0x%x\n",
1667 __func__, im_protocols, tm_protocols);
1668
1669 if (dev->tgt_active_prot) {
1670 nfc_err(dev->dev,
1671 "Cannot poll with a target already activated\n");
1672 return -EBUSY;
1673 }
1674
1675 if (dev->tgt_mode) {
1676 nfc_err(dev->dev,
1677 "Cannot poll while already being activated\n");
1678 return -EBUSY;
1679 }
1680
1681 if (tm_protocols) {
1682 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1683 if (dev->gb == NULL)
1684 tm_protocols = 0;
1685 }
1686
1687 dev->poll_protocols = im_protocols;
1688 dev->listen_protocols = tm_protocols;
1689 if (dev->device_type == PN533_DEVICE_PN532_AUTOPOLL) {
1690 skb = pn533_alloc_skb(dev, 4 + 6);
1691 if (!skb)
1692 return -ENOMEM;
1693
1694 *((u8 *)skb_put(skb, sizeof(u8))) =
1695 PN532_AUTOPOLL_POLLNR_INFINITE;
1696 *((u8 *)skb_put(skb, sizeof(u8))) = PN532_AUTOPOLL_PERIOD;
1697
1698 if ((im_protocols & NFC_PROTO_MIFARE_MASK) &&
1699 (im_protocols & NFC_PROTO_ISO14443_MASK) &&
1700 (im_protocols & NFC_PROTO_NFC_DEP_MASK))
1701 *((u8 *)skb_put(skb, sizeof(u8))) =
1702 PN532_AUTOPOLL_TYPE_GENERIC_106;
1703 else {
1704 if (im_protocols & NFC_PROTO_MIFARE_MASK)
1705 *((u8 *)skb_put(skb, sizeof(u8))) =
1706 PN532_AUTOPOLL_TYPE_MIFARE;
1707
1708 if (im_protocols & NFC_PROTO_ISO14443_MASK)
1709 *((u8 *)skb_put(skb, sizeof(u8))) =
1710 PN532_AUTOPOLL_TYPE_ISOA;
1711
1712 if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1713 *((u8 *)skb_put(skb, sizeof(u8))) =
1714 PN532_AUTOPOLL_TYPE_DEP_PASSIVE_106;
1715 *((u8 *)skb_put(skb, sizeof(u8))) =
1716 PN532_AUTOPOLL_TYPE_DEP_PASSIVE_212;
1717 *((u8 *)skb_put(skb, sizeof(u8))) =
1718 PN532_AUTOPOLL_TYPE_DEP_PASSIVE_424;
1719 }
1720 }
1721
1722 if (im_protocols & NFC_PROTO_FELICA_MASK ||
1723 im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1724 *((u8 *)skb_put(skb, sizeof(u8))) =
1725 PN532_AUTOPOLL_TYPE_FELICA212;
1726 *((u8 *)skb_put(skb, sizeof(u8))) =
1727 PN532_AUTOPOLL_TYPE_FELICA424;
1728 }
1729
1730 if (im_protocols & NFC_PROTO_JEWEL_MASK)
1731 *((u8 *)skb_put(skb, sizeof(u8))) =
1732 PN532_AUTOPOLL_TYPE_JEWEL;
1733
1734 if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1735 *((u8 *)skb_put(skb, sizeof(u8))) =
1736 PN532_AUTOPOLL_TYPE_ISOB;
1737
1738 if (tm_protocols)
1739 *((u8 *)skb_put(skb, sizeof(u8))) =
1740 PN532_AUTOPOLL_TYPE_DEP_ACTIVE_106;
1741
1742 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_AUTOPOLL, skb,
1743 pn533_autopoll_complete, NULL);
1744
1745 if (rc < 0)
1746 dev_kfree_skb(skb);
1747 else
1748 dev->poll_mod_count++;
1749
1750 return rc;
1751 }
1752
1753 pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1754
1755 /* Do not always start polling from the same modulation */
1756 get_random_bytes(&rand_mod, sizeof(rand_mod));
1757 rand_mod %= dev->poll_mod_count;
1758 dev->poll_mod_curr = rand_mod;
1759
1760 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1761
1762 rc = pn533_send_poll_frame(dev);
1763
1764 /* Start listen timer */
1765 if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
1766 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1767
1768 return rc;
1769 }
1770
pn533_stop_poll(struct nfc_dev * nfc_dev)1771 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1772 {
1773 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1774
1775 del_timer(&dev->listen_timer);
1776
1777 if (!dev->poll_mod_count) {
1778 dev_dbg(dev->dev,
1779 "Polling operation was not running\n");
1780 return;
1781 }
1782
1783 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1784 flush_delayed_work(&dev->poll_work);
1785 pn533_poll_reset_mod_list(dev);
1786 }
1787
pn533_activate_target_nfcdep(struct pn533 * dev)1788 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1789 {
1790 struct pn533_cmd_activate_response *rsp;
1791 u16 gt_len;
1792 int rc;
1793 struct sk_buff *skb;
1794 struct sk_buff *resp;
1795
1796 dev_dbg(dev->dev, "%s\n", __func__);
1797
1798 skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1799 if (!skb)
1800 return -ENOMEM;
1801
1802 skb_put_u8(skb, 1); /* TG */
1803 skb_put_u8(skb, 0); /* Next */
1804
1805 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1806 if (IS_ERR(resp))
1807 return PTR_ERR(resp);
1808
1809 rsp = (struct pn533_cmd_activate_response *)resp->data;
1810 rc = rsp->status & PN533_CMD_RET_MASK;
1811 if (rc != PN533_CMD_RET_SUCCESS) {
1812 nfc_err(dev->dev,
1813 "Target activation failed (error 0x%x)\n", rc);
1814 dev_kfree_skb(resp);
1815 return -EIO;
1816 }
1817
1818 /* ATR_RES general bytes are located at offset 16 */
1819 gt_len = resp->len - 16;
1820 rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1821
1822 dev_kfree_skb(resp);
1823 return rc;
1824 }
1825
pn533_activate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,u32 protocol)1826 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1827 struct nfc_target *target, u32 protocol)
1828 {
1829 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1830 int rc;
1831
1832 dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol);
1833
1834 if (dev->poll_mod_count) {
1835 nfc_err(dev->dev,
1836 "Cannot activate while polling\n");
1837 return -EBUSY;
1838 }
1839
1840 if (dev->tgt_active_prot) {
1841 nfc_err(dev->dev,
1842 "There is already an active target\n");
1843 return -EBUSY;
1844 }
1845
1846 if (!dev->tgt_available_prots) {
1847 nfc_err(dev->dev,
1848 "There is no available target to activate\n");
1849 return -EINVAL;
1850 }
1851
1852 if (!(dev->tgt_available_prots & (1 << protocol))) {
1853 nfc_err(dev->dev,
1854 "Target doesn't support requested proto %u\n",
1855 protocol);
1856 return -EINVAL;
1857 }
1858
1859 if (protocol == NFC_PROTO_NFC_DEP) {
1860 rc = pn533_activate_target_nfcdep(dev);
1861 if (rc) {
1862 nfc_err(dev->dev,
1863 "Activating target with DEP failed %d\n", rc);
1864 return rc;
1865 }
1866 }
1867
1868 dev->tgt_active_prot = protocol;
1869 dev->tgt_available_prots = 0;
1870
1871 return 0;
1872 }
1873
pn533_deactivate_target_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1874 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg,
1875 struct sk_buff *resp)
1876 {
1877 int rc = 0;
1878
1879 dev_dbg(dev->dev, "%s\n", __func__);
1880
1881 if (IS_ERR(resp)) {
1882 rc = PTR_ERR(resp);
1883
1884 nfc_err(dev->dev, "Target release error %d\n", rc);
1885
1886 return rc;
1887 }
1888
1889 rc = resp->data[0] & PN533_CMD_RET_MASK;
1890 if (rc != PN533_CMD_RET_SUCCESS)
1891 nfc_err(dev->dev,
1892 "Error 0x%x when releasing the target\n", rc);
1893
1894 dev_kfree_skb(resp);
1895 return rc;
1896 }
1897
pn533_deactivate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,u8 mode)1898 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1899 struct nfc_target *target, u8 mode)
1900 {
1901 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1902 struct sk_buff *skb;
1903 int rc;
1904
1905 dev_dbg(dev->dev, "%s\n", __func__);
1906
1907 if (!dev->tgt_active_prot) {
1908 nfc_err(dev->dev, "There is no active target\n");
1909 return;
1910 }
1911
1912 dev->tgt_active_prot = 0;
1913 skb_queue_purge(&dev->resp_q);
1914
1915 skb = pn533_alloc_skb(dev, sizeof(u8));
1916 if (!skb)
1917 return;
1918
1919 skb_put_u8(skb, 1); /* TG*/
1920
1921 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb,
1922 pn533_deactivate_target_complete, NULL);
1923 if (rc < 0) {
1924 dev_kfree_skb(skb);
1925 nfc_err(dev->dev, "Target release error %d\n", rc);
1926 }
1927 }
1928
1929
pn533_in_dep_link_up_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1930 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1931 struct sk_buff *resp)
1932 {
1933 struct pn533_cmd_jump_dep_response *rsp;
1934 u8 target_gt_len;
1935 int rc;
1936 u8 active = *(u8 *)arg;
1937
1938 kfree(arg);
1939
1940 if (IS_ERR(resp))
1941 return PTR_ERR(resp);
1942
1943 if (dev->tgt_available_prots &&
1944 !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1945 nfc_err(dev->dev,
1946 "The target does not support DEP\n");
1947 rc = -EINVAL;
1948 goto error;
1949 }
1950
1951 rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1952
1953 rc = rsp->status & PN533_CMD_RET_MASK;
1954 if (rc != PN533_CMD_RET_SUCCESS) {
1955 nfc_err(dev->dev,
1956 "Bringing DEP link up failed (error 0x%x)\n", rc);
1957 goto error;
1958 }
1959
1960 if (!dev->tgt_available_prots) {
1961 struct nfc_target nfc_target;
1962
1963 dev_dbg(dev->dev, "Creating new target\n");
1964
1965 memset(&nfc_target, 0, sizeof(struct nfc_target));
1966
1967 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1968 nfc_target.nfcid1_len = 10;
1969 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1970 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1971 if (rc)
1972 goto error;
1973
1974 dev->tgt_available_prots = 0;
1975 }
1976
1977 dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1978
1979 /* ATR_RES general bytes are located at offset 17 */
1980 target_gt_len = resp->len - 17;
1981 rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1982 rsp->gt, target_gt_len);
1983 if (rc == 0)
1984 rc = nfc_dep_link_is_up(dev->nfc_dev,
1985 dev->nfc_dev->targets[0].idx,
1986 !active, NFC_RF_INITIATOR);
1987
1988 error:
1989 dev_kfree_skb(resp);
1990 return rc;
1991 }
1992
1993 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)1994 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1995 u8 comm_mode, u8 *gb, size_t gb_len)
1996 {
1997 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1998 struct sk_buff *skb;
1999 int rc, skb_len;
2000 u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
2001 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
2002
2003 dev_dbg(dev->dev, "%s\n", __func__);
2004
2005 if (dev->poll_mod_count) {
2006 nfc_err(dev->dev,
2007 "Cannot bring the DEP link up while polling\n");
2008 return -EBUSY;
2009 }
2010
2011 if (dev->tgt_active_prot) {
2012 nfc_err(dev->dev,
2013 "There is already an active target\n");
2014 return -EBUSY;
2015 }
2016
2017 skb_len = 3 + gb_len; /* ActPass + BR + Next */
2018 skb_len += PASSIVE_DATA_LEN;
2019
2020 /* NFCID3 */
2021 skb_len += NFC_NFCID3_MAXSIZE;
2022 if (target && !target->nfcid2_len) {
2023 nfcid3[0] = 0x1;
2024 nfcid3[1] = 0xfe;
2025 get_random_bytes(nfcid3 + 2, 6);
2026 }
2027
2028 skb = pn533_alloc_skb(dev, skb_len);
2029 if (!skb)
2030 return -ENOMEM;
2031
2032 skb_put_u8(skb, !comm_mode); /* ActPass */
2033 skb_put_u8(skb, 0x02); /* 424 kbps */
2034
2035 next = skb_put(skb, 1); /* Next */
2036 *next = 0;
2037
2038 /* Copy passive data */
2039 skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
2040 *next |= 1;
2041
2042 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
2043 if (target && target->nfcid2_len)
2044 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
2045 target->nfcid2_len);
2046 else
2047 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
2048 *next |= 2;
2049
2050 if (gb != NULL && gb_len > 0) {
2051 skb_put_data(skb, gb, gb_len);
2052 *next |= 4; /* We have some Gi */
2053 } else {
2054 *next = 0;
2055 }
2056
2057 arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2058 if (!arg) {
2059 dev_kfree_skb(skb);
2060 return -ENOMEM;
2061 }
2062
2063 *arg = !comm_mode;
2064
2065 pn533_rf_field(dev->nfc_dev, 0);
2066
2067 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
2068 pn533_in_dep_link_up_complete, arg);
2069
2070 if (rc < 0) {
2071 dev_kfree_skb(skb);
2072 kfree(arg);
2073 }
2074
2075 return rc;
2076 }
2077
pn533_dep_link_down(struct nfc_dev * nfc_dev)2078 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
2079 {
2080 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2081
2082 dev_dbg(dev->dev, "%s\n", __func__);
2083
2084 pn533_poll_reset_mod_list(dev);
2085
2086 if (dev->tgt_mode || dev->tgt_active_prot)
2087 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
2088
2089 dev->tgt_active_prot = 0;
2090 dev->tgt_mode = 0;
2091
2092 skb_queue_purge(&dev->resp_q);
2093
2094 return 0;
2095 }
2096
2097 struct pn533_data_exchange_arg {
2098 data_exchange_cb_t cb;
2099 void *cb_context;
2100 };
2101
pn533_build_response(struct pn533 * dev)2102 static struct sk_buff *pn533_build_response(struct pn533 *dev)
2103 {
2104 struct sk_buff *skb, *tmp, *t;
2105 unsigned int skb_len = 0, tmp_len = 0;
2106
2107 dev_dbg(dev->dev, "%s\n", __func__);
2108
2109 if (skb_queue_empty(&dev->resp_q))
2110 return NULL;
2111
2112 if (skb_queue_len(&dev->resp_q) == 1) {
2113 skb = skb_dequeue(&dev->resp_q);
2114 goto out;
2115 }
2116
2117 skb_queue_walk_safe(&dev->resp_q, tmp, t)
2118 skb_len += tmp->len;
2119
2120 dev_dbg(dev->dev, "%s total length %d\n",
2121 __func__, skb_len);
2122
2123 skb = alloc_skb(skb_len, GFP_KERNEL);
2124 if (skb == NULL)
2125 goto out;
2126
2127 skb_put(skb, skb_len);
2128
2129 skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2130 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2131 tmp_len += tmp->len;
2132 }
2133
2134 out:
2135 skb_queue_purge(&dev->resp_q);
2136
2137 return skb;
2138 }
2139
pn533_data_exchange_complete(struct pn533 * dev,void * _arg,struct sk_buff * resp)2140 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2141 struct sk_buff *resp)
2142 {
2143 struct pn533_data_exchange_arg *arg = _arg;
2144 struct sk_buff *skb;
2145 int rc = 0;
2146 u8 status, ret, mi;
2147
2148 dev_dbg(dev->dev, "%s\n", __func__);
2149
2150 if (IS_ERR(resp)) {
2151 rc = PTR_ERR(resp);
2152 goto _error;
2153 }
2154
2155 status = resp->data[0];
2156 ret = status & PN533_CMD_RET_MASK;
2157 mi = status & PN533_CMD_MI_MASK;
2158
2159 skb_pull(resp, sizeof(status));
2160
2161 if (ret != PN533_CMD_RET_SUCCESS) {
2162 nfc_err(dev->dev,
2163 "Exchanging data failed (error 0x%x)\n", ret);
2164 rc = -EIO;
2165 goto error;
2166 }
2167
2168 skb_queue_tail(&dev->resp_q, resp);
2169
2170 if (mi) {
2171 dev->cmd_complete_mi_arg = arg;
2172 queue_work(dev->wq, &dev->mi_rx_work);
2173 return -EINPROGRESS;
2174 }
2175
2176 /* Prepare for the next round */
2177 if (skb_queue_len(&dev->fragment_skb) > 0) {
2178 dev->cmd_complete_dep_arg = arg;
2179 queue_work(dev->wq, &dev->mi_tx_work);
2180
2181 return -EINPROGRESS;
2182 }
2183
2184 skb = pn533_build_response(dev);
2185 if (!skb) {
2186 rc = -ENOMEM;
2187 goto error;
2188 }
2189
2190 arg->cb(arg->cb_context, skb, 0);
2191 kfree(arg);
2192 return 0;
2193
2194 error:
2195 dev_kfree_skb(resp);
2196 _error:
2197 skb_queue_purge(&dev->resp_q);
2198 arg->cb(arg->cb_context, NULL, rc);
2199 kfree(arg);
2200 return rc;
2201 }
2202
2203 /*
2204 * Receive an incoming pn533 frame. skb contains only header and payload.
2205 * If skb == NULL, it is a notification that the link below is dead.
2206 */
pn533_recv_frame(struct pn533 * dev,struct sk_buff * skb,int status)2207 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2208 {
2209 if (!dev->cmd)
2210 goto sched_wq;
2211
2212 dev->cmd->status = status;
2213
2214 if (status != 0) {
2215 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2216 goto sched_wq;
2217 }
2218
2219 if (skb == NULL) {
2220 pr_err("NULL Frame -> link is dead\n");
2221 goto sched_wq;
2222 }
2223
2224 if (pn533_rx_frame_is_ack(skb->data)) {
2225 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2226 dev_kfree_skb(skb);
2227 return;
2228 }
2229
2230 print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2231 dev->ops->rx_frame_size(skb->data), false);
2232
2233 if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2234 nfc_err(dev->dev, "Received an invalid frame\n");
2235 dev->cmd->status = -EIO;
2236 } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2237 nfc_err(dev->dev, "It it not the response to the last command\n");
2238 dev->cmd->status = -EIO;
2239 }
2240
2241 dev->cmd->resp = skb;
2242
2243 sched_wq:
2244 queue_work(dev->wq, &dev->cmd_complete_work);
2245 }
2246 EXPORT_SYMBOL(pn533_recv_frame);
2247
2248 /* Split the Tx skb into small chunks */
pn533_fill_fragment_skbs(struct pn533 * dev,struct sk_buff * skb)2249 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2250 {
2251 struct sk_buff *frag;
2252 int frag_size;
2253
2254 do {
2255 /* Remaining size */
2256 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2257 frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2258 else
2259 frag_size = skb->len;
2260
2261 /* Allocate and reserve */
2262 frag = pn533_alloc_skb(dev, frag_size);
2263 if (!frag) {
2264 skb_queue_purge(&dev->fragment_skb);
2265 return -ENOMEM;
2266 }
2267
2268 if (!dev->tgt_mode) {
2269 /* Reserve the TG/MI byte */
2270 skb_reserve(frag, 1);
2271
2272 /* MI + TG */
2273 if (frag_size == PN533_CMD_DATAFRAME_MAXLEN)
2274 *(u8 *)skb_push(frag, sizeof(u8)) =
2275 (PN533_CMD_MI_MASK | 1);
2276 else
2277 *(u8 *)skb_push(frag, sizeof(u8)) = 1; /* TG */
2278 }
2279
2280 skb_put_data(frag, skb->data, frag_size);
2281
2282 /* Reduce the size of incoming buffer */
2283 skb_pull(skb, frag_size);
2284
2285 /* Add this to skb_queue */
2286 skb_queue_tail(&dev->fragment_skb, frag);
2287
2288 } while (skb->len > 0);
2289
2290 dev_kfree_skb(skb);
2291
2292 return skb_queue_len(&dev->fragment_skb);
2293 }
2294
pn533_transceive(struct nfc_dev * nfc_dev,struct nfc_target * target,struct sk_buff * skb,data_exchange_cb_t cb,void * cb_context)2295 static int pn533_transceive(struct nfc_dev *nfc_dev,
2296 struct nfc_target *target, struct sk_buff *skb,
2297 data_exchange_cb_t cb, void *cb_context)
2298 {
2299 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2300 struct pn533_data_exchange_arg *arg = NULL;
2301 int rc;
2302
2303 dev_dbg(dev->dev, "%s\n", __func__);
2304
2305 if (!dev->tgt_active_prot) {
2306 nfc_err(dev->dev,
2307 "Can't exchange data if there is no active target\n");
2308 rc = -EINVAL;
2309 goto error;
2310 }
2311
2312 arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2313 if (!arg) {
2314 rc = -ENOMEM;
2315 goto error;
2316 }
2317
2318 arg->cb = cb;
2319 arg->cb_context = cb_context;
2320
2321 switch (dev->device_type) {
2322 case PN533_DEVICE_PASORI:
2323 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2324 rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2325 skb,
2326 pn533_data_exchange_complete,
2327 arg);
2328
2329 break;
2330 }
2331 fallthrough;
2332 default:
2333 /* jumbo frame ? */
2334 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2335 rc = pn533_fill_fragment_skbs(dev, skb);
2336 if (rc < 0)
2337 goto error;
2338
2339 skb = skb_dequeue(&dev->fragment_skb);
2340 if (!skb) {
2341 rc = -EIO;
2342 goto error;
2343 }
2344 } else {
2345 *(u8 *)skb_push(skb, sizeof(u8)) = 1; /* TG */
2346 }
2347
2348 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2349 skb, pn533_data_exchange_complete,
2350 arg);
2351
2352 break;
2353 }
2354
2355 if (rc < 0) /* rc from send_async */
2356 goto error;
2357
2358 return 0;
2359
2360 error:
2361 kfree(arg);
2362 dev_kfree_skb(skb);
2363 return rc;
2364 }
2365
pn533_tm_send_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)2366 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2367 struct sk_buff *resp)
2368 {
2369 u8 status;
2370
2371 dev_dbg(dev->dev, "%s\n", __func__);
2372
2373 if (IS_ERR(resp))
2374 return PTR_ERR(resp);
2375
2376 status = resp->data[0];
2377
2378 /* Prepare for the next round */
2379 if (skb_queue_len(&dev->fragment_skb) > 0) {
2380 queue_work(dev->wq, &dev->mi_tm_tx_work);
2381 return -EINPROGRESS;
2382 }
2383 dev_kfree_skb(resp);
2384
2385 if (status != 0) {
2386 nfc_tm_deactivated(dev->nfc_dev);
2387
2388 dev->tgt_mode = 0;
2389
2390 return 0;
2391 }
2392
2393 queue_work(dev->wq, &dev->tg_work);
2394
2395 return 0;
2396 }
2397
pn533_tm_send(struct nfc_dev * nfc_dev,struct sk_buff * skb)2398 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2399 {
2400 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2401 int rc;
2402
2403 dev_dbg(dev->dev, "%s\n", __func__);
2404
2405 /* let's split in multiple chunks if size's too big */
2406 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2407 rc = pn533_fill_fragment_skbs(dev, skb);
2408 if (rc < 0)
2409 goto error;
2410
2411 /* get the first skb */
2412 skb = skb_dequeue(&dev->fragment_skb);
2413 if (!skb) {
2414 rc = -EIO;
2415 goto error;
2416 }
2417
2418 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2419 pn533_tm_send_complete, NULL);
2420 } else {
2421 /* Send th skb */
2422 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2423 pn533_tm_send_complete, NULL);
2424 }
2425
2426 error:
2427 if (rc < 0) {
2428 dev_kfree_skb(skb);
2429 skb_queue_purge(&dev->fragment_skb);
2430 }
2431
2432 return rc;
2433 }
2434
pn533_wq_mi_recv(struct work_struct * work)2435 static void pn533_wq_mi_recv(struct work_struct *work)
2436 {
2437 struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2438 struct sk_buff *skb;
2439 int rc;
2440
2441 dev_dbg(dev->dev, "%s\n", __func__);
2442
2443 skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2444 if (!skb)
2445 goto error;
2446
2447 switch (dev->device_type) {
2448 case PN533_DEVICE_PASORI:
2449 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2450 rc = pn533_send_cmd_direct_async(dev,
2451 PN533_CMD_IN_COMM_THRU,
2452 skb,
2453 pn533_data_exchange_complete,
2454 dev->cmd_complete_mi_arg);
2455
2456 break;
2457 }
2458 fallthrough;
2459 default:
2460 skb_put_u8(skb, 1); /*TG*/
2461
2462 rc = pn533_send_cmd_direct_async(dev,
2463 PN533_CMD_IN_DATA_EXCHANGE,
2464 skb,
2465 pn533_data_exchange_complete,
2466 dev->cmd_complete_mi_arg);
2467
2468 break;
2469 }
2470
2471 if (rc == 0) /* success */
2472 return;
2473
2474 nfc_err(dev->dev,
2475 "Error %d when trying to perform data_exchange\n", rc);
2476
2477 dev_kfree_skb(skb);
2478 kfree(dev->cmd_complete_mi_arg);
2479
2480 error:
2481 dev->phy_ops->send_ack(dev, GFP_KERNEL);
2482 queue_work(dev->wq, &dev->cmd_work);
2483 }
2484
pn533_wq_mi_send(struct work_struct * work)2485 static void pn533_wq_mi_send(struct work_struct *work)
2486 {
2487 struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2488 struct sk_buff *skb;
2489 int rc;
2490
2491 dev_dbg(dev->dev, "%s\n", __func__);
2492
2493 /* Grab the first skb in the queue */
2494 skb = skb_dequeue(&dev->fragment_skb);
2495
2496 if (skb == NULL) { /* No more data */
2497 /* Reset the queue for future use */
2498 skb_queue_head_init(&dev->fragment_skb);
2499 goto error;
2500 }
2501
2502 switch (dev->device_type) {
2503 case PN533_DEVICE_PASORI:
2504 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2505 rc = -EIO;
2506 break;
2507 }
2508
2509 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2510 skb,
2511 pn533_data_exchange_complete,
2512 dev->cmd_complete_dep_arg);
2513
2514 break;
2515
2516 default:
2517 /* Still some fragments? */
2518 rc = pn533_send_cmd_direct_async(dev,
2519 PN533_CMD_IN_DATA_EXCHANGE,
2520 skb,
2521 pn533_data_exchange_complete,
2522 dev->cmd_complete_dep_arg);
2523
2524 break;
2525 }
2526
2527 if (rc == 0) /* success */
2528 return;
2529
2530 nfc_err(dev->dev,
2531 "Error %d when trying to perform data_exchange\n", rc);
2532
2533 dev_kfree_skb(skb);
2534 kfree(dev->cmd_complete_dep_arg);
2535
2536 error:
2537 dev->phy_ops->send_ack(dev, GFP_KERNEL);
2538 queue_work(dev->wq, &dev->cmd_work);
2539 }
2540
pn533_set_configuration(struct pn533 * dev,u8 cfgitem,u8 * cfgdata,u8 cfgdata_len)2541 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2542 u8 cfgdata_len)
2543 {
2544 struct sk_buff *skb;
2545 struct sk_buff *resp;
2546 int skb_len;
2547
2548 dev_dbg(dev->dev, "%s\n", __func__);
2549
2550 skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2551
2552 skb = pn533_alloc_skb(dev, skb_len);
2553 if (!skb)
2554 return -ENOMEM;
2555
2556 skb_put_u8(skb, cfgitem);
2557 skb_put_data(skb, cfgdata, cfgdata_len);
2558
2559 resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2560 if (IS_ERR(resp))
2561 return PTR_ERR(resp);
2562
2563 dev_kfree_skb(resp);
2564 return 0;
2565 }
2566
pn533_get_firmware_version(struct pn533 * dev,struct pn533_fw_version * fv)2567 static int pn533_get_firmware_version(struct pn533 *dev,
2568 struct pn533_fw_version *fv)
2569 {
2570 struct sk_buff *skb;
2571 struct sk_buff *resp;
2572
2573 skb = pn533_alloc_skb(dev, 0);
2574 if (!skb)
2575 return -ENOMEM;
2576
2577 resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2578 if (IS_ERR(resp))
2579 return PTR_ERR(resp);
2580
2581 fv->ic = resp->data[0];
2582 fv->ver = resp->data[1];
2583 fv->rev = resp->data[2];
2584 fv->support = resp->data[3];
2585
2586 dev_kfree_skb(resp);
2587 return 0;
2588 }
2589
pn533_pasori_fw_reset(struct pn533 * dev)2590 static int pn533_pasori_fw_reset(struct pn533 *dev)
2591 {
2592 struct sk_buff *skb;
2593 struct sk_buff *resp;
2594
2595 dev_dbg(dev->dev, "%s\n", __func__);
2596
2597 skb = pn533_alloc_skb(dev, sizeof(u8));
2598 if (!skb)
2599 return -ENOMEM;
2600
2601 skb_put_u8(skb, 0x1);
2602
2603 resp = pn533_send_cmd_sync(dev, 0x18, skb);
2604 if (IS_ERR(resp))
2605 return PTR_ERR(resp);
2606
2607 dev_kfree_skb(resp);
2608
2609 return 0;
2610 }
2611
pn533_rf_field(struct nfc_dev * nfc_dev,u8 rf)2612 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2613 {
2614 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2615 u8 rf_field = !!rf;
2616 int rc;
2617
2618 rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2619
2620 rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2621 (u8 *)&rf_field, 1);
2622 if (rc) {
2623 nfc_err(dev->dev, "Error on setting RF field\n");
2624 return rc;
2625 }
2626
2627 return rc;
2628 }
2629
pn532_sam_configuration(struct nfc_dev * nfc_dev)2630 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2631 {
2632 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2633 struct sk_buff *skb;
2634 struct sk_buff *resp;
2635
2636 skb = pn533_alloc_skb(dev, 1);
2637 if (!skb)
2638 return -ENOMEM;
2639
2640 skb_put_u8(skb, 0x01);
2641
2642 resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2643 if (IS_ERR(resp))
2644 return PTR_ERR(resp);
2645
2646 dev_kfree_skb(resp);
2647 return 0;
2648 }
2649
pn533_dev_up(struct nfc_dev * nfc_dev)2650 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2651 {
2652 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2653 int rc;
2654
2655 if (dev->phy_ops->dev_up) {
2656 rc = dev->phy_ops->dev_up(dev);
2657 if (rc)
2658 return rc;
2659 }
2660
2661 if ((dev->device_type == PN533_DEVICE_PN532) ||
2662 (dev->device_type == PN533_DEVICE_PN532_AUTOPOLL)) {
2663 rc = pn532_sam_configuration(nfc_dev);
2664
2665 if (rc)
2666 return rc;
2667 }
2668
2669 return pn533_rf_field(nfc_dev, 1);
2670 }
2671
pn533_dev_down(struct nfc_dev * nfc_dev)2672 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2673 {
2674 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2675 int ret;
2676
2677 ret = pn533_rf_field(nfc_dev, 0);
2678 if (dev->phy_ops->dev_down && !ret)
2679 ret = dev->phy_ops->dev_down(dev);
2680
2681 return ret;
2682 }
2683
2684 static struct nfc_ops pn533_nfc_ops = {
2685 .dev_up = pn533_dev_up,
2686 .dev_down = pn533_dev_down,
2687 .dep_link_up = pn533_dep_link_up,
2688 .dep_link_down = pn533_dep_link_down,
2689 .start_poll = pn533_start_poll,
2690 .stop_poll = pn533_stop_poll,
2691 .activate_target = pn533_activate_target,
2692 .deactivate_target = pn533_deactivate_target,
2693 .im_transceive = pn533_transceive,
2694 .tm_send = pn533_tm_send,
2695 };
2696
pn533_setup(struct pn533 * dev)2697 static int pn533_setup(struct pn533 *dev)
2698 {
2699 struct pn533_config_max_retries max_retries;
2700 struct pn533_config_timing timing;
2701 u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2702 int rc;
2703
2704 switch (dev->device_type) {
2705 case PN533_DEVICE_STD:
2706 case PN533_DEVICE_PASORI:
2707 case PN533_DEVICE_ACR122U:
2708 case PN533_DEVICE_PN532:
2709 case PN533_DEVICE_PN532_AUTOPOLL:
2710 max_retries.mx_rty_atr = 0x2;
2711 max_retries.mx_rty_psl = 0x1;
2712 max_retries.mx_rty_passive_act =
2713 PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2714
2715 timing.rfu = PN533_CONFIG_TIMING_102;
2716 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2717 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2718
2719 break;
2720
2721 default:
2722 nfc_err(dev->dev, "Unknown device type %d\n",
2723 dev->device_type);
2724 return -EINVAL;
2725 }
2726
2727 rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2728 (u8 *)&max_retries, sizeof(max_retries));
2729 if (rc) {
2730 nfc_err(dev->dev,
2731 "Error on setting MAX_RETRIES config\n");
2732 return rc;
2733 }
2734
2735
2736 rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2737 (u8 *)&timing, sizeof(timing));
2738 if (rc) {
2739 nfc_err(dev->dev, "Error on setting RF timings\n");
2740 return rc;
2741 }
2742
2743 switch (dev->device_type) {
2744 case PN533_DEVICE_STD:
2745 case PN533_DEVICE_PN532:
2746 case PN533_DEVICE_PN532_AUTOPOLL:
2747 break;
2748
2749 case PN533_DEVICE_PASORI:
2750 pn533_pasori_fw_reset(dev);
2751
2752 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2753 pasori_cfg, 3);
2754 if (rc) {
2755 nfc_err(dev->dev,
2756 "Error while settings PASORI config\n");
2757 return rc;
2758 }
2759
2760 pn533_pasori_fw_reset(dev);
2761
2762 break;
2763 }
2764
2765 return 0;
2766 }
2767
pn533_finalize_setup(struct pn533 * dev)2768 int pn533_finalize_setup(struct pn533 *dev)
2769 {
2770
2771 struct pn533_fw_version fw_ver;
2772 int rc;
2773
2774 memset(&fw_ver, 0, sizeof(fw_ver));
2775
2776 rc = pn533_get_firmware_version(dev, &fw_ver);
2777 if (rc) {
2778 nfc_err(dev->dev, "Unable to get FW version\n");
2779 return rc;
2780 }
2781
2782 nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2783 fw_ver.ic, fw_ver.ver, fw_ver.rev);
2784
2785 rc = pn533_setup(dev);
2786 if (rc)
2787 return rc;
2788
2789 return 0;
2790 }
2791 EXPORT_SYMBOL_GPL(pn533_finalize_setup);
2792
pn53x_common_init(u32 device_type,enum pn533_protocol_type protocol_type,void * phy,struct pn533_phy_ops * phy_ops,struct pn533_frame_ops * fops,struct device * dev)2793 struct pn533 *pn53x_common_init(u32 device_type,
2794 enum pn533_protocol_type protocol_type,
2795 void *phy,
2796 struct pn533_phy_ops *phy_ops,
2797 struct pn533_frame_ops *fops,
2798 struct device *dev)
2799 {
2800 struct pn533 *priv;
2801 int rc = -ENOMEM;
2802
2803 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2804 if (!priv)
2805 return ERR_PTR(-ENOMEM);
2806
2807 priv->phy = phy;
2808 priv->phy_ops = phy_ops;
2809 priv->dev = dev;
2810 if (fops != NULL)
2811 priv->ops = fops;
2812 else
2813 priv->ops = &pn533_std_frame_ops;
2814
2815 priv->protocol_type = protocol_type;
2816 priv->device_type = device_type;
2817
2818 mutex_init(&priv->cmd_lock);
2819
2820 INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2821 INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2822 INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2823 INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2824 INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2825 INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2826 INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2827 INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2828 INIT_WORK(&priv->rf_work, pn533_wq_rf);
2829 priv->wq = alloc_ordered_workqueue("pn533", 0);
2830 if (priv->wq == NULL)
2831 goto error;
2832
2833 timer_setup(&priv->listen_timer, pn533_listen_mode_timer, 0);
2834
2835 skb_queue_head_init(&priv->resp_q);
2836 skb_queue_head_init(&priv->fragment_skb);
2837
2838 INIT_LIST_HEAD(&priv->cmd_queue);
2839 return priv;
2840
2841 error:
2842 kfree(priv);
2843 return ERR_PTR(rc);
2844 }
2845 EXPORT_SYMBOL_GPL(pn53x_common_init);
2846
pn53x_common_clean(struct pn533 * priv)2847 void pn53x_common_clean(struct pn533 *priv)
2848 {
2849 struct pn533_cmd *cmd, *n;
2850
2851 /* delete the timer before cleanup the worker */
2852 del_timer_sync(&priv->listen_timer);
2853
2854 flush_delayed_work(&priv->poll_work);
2855 destroy_workqueue(priv->wq);
2856
2857 skb_queue_purge(&priv->resp_q);
2858
2859 list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2860 list_del(&cmd->queue);
2861 kfree(cmd);
2862 }
2863
2864 kfree(priv);
2865 }
2866 EXPORT_SYMBOL_GPL(pn53x_common_clean);
2867
pn532_i2c_nfc_alloc(struct pn533 * priv,u32 protocols,struct device * parent)2868 int pn532_i2c_nfc_alloc(struct pn533 *priv, u32 protocols,
2869 struct device *parent)
2870 {
2871 priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2872 priv->ops->tx_header_len +
2873 PN533_CMD_DATAEXCH_HEAD_LEN,
2874 priv->ops->tx_tail_len);
2875 if (!priv->nfc_dev)
2876 return -ENOMEM;
2877
2878 nfc_set_parent_dev(priv->nfc_dev, parent);
2879 nfc_set_drvdata(priv->nfc_dev, priv);
2880 return 0;
2881 }
2882 EXPORT_SYMBOL_GPL(pn532_i2c_nfc_alloc);
2883
pn53x_register_nfc(struct pn533 * priv,u32 protocols,struct device * parent)2884 int pn53x_register_nfc(struct pn533 *priv, u32 protocols,
2885 struct device *parent)
2886 {
2887 int rc;
2888
2889 rc = pn532_i2c_nfc_alloc(priv, protocols, parent);
2890 if (rc)
2891 return rc;
2892
2893 rc = nfc_register_device(priv->nfc_dev);
2894 if (rc)
2895 nfc_free_device(priv->nfc_dev);
2896
2897 return rc;
2898 }
2899 EXPORT_SYMBOL_GPL(pn53x_register_nfc);
2900
pn53x_unregister_nfc(struct pn533 * priv)2901 void pn53x_unregister_nfc(struct pn533 *priv)
2902 {
2903 nfc_unregister_device(priv->nfc_dev);
2904 nfc_free_device(priv->nfc_dev);
2905 }
2906 EXPORT_SYMBOL_GPL(pn53x_unregister_nfc);
2907
2908 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
2909 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2910 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
2911 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2912 MODULE_VERSION(VERSION);
2913 MODULE_LICENSE("GPL");
2914