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 rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1323
1324 rc = rsp->status & PN533_CMD_RET_MASK;
1325 if (rc != PN533_CMD_RET_SUCCESS) {
1326 /* Not target found, turn radio off */
1327 queue_work(dev->wq, &dev->rf_work);
1328
1329 dev_kfree_skb(resp);
1330 return 0;
1331 }
1332
1333 dev_dbg(dev->dev, "Creating new target");
1334
1335 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1336 nfc_target.nfcid1_len = 10;
1337 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1338 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1339 if (rc)
1340 goto error;
1341
1342 dev->tgt_available_prots = 0;
1343 dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1344
1345 /* ATR_RES general bytes are located at offset 17 */
1346 target_gt_len = resp->len - 17;
1347 rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1348 rsp->gt, target_gt_len);
1349 if (!rc) {
1350 rc = nfc_dep_link_is_up(dev->nfc_dev,
1351 dev->nfc_dev->targets[0].idx,
1352 0, NFC_RF_INITIATOR);
1353
1354 if (!rc)
1355 pn533_poll_reset_mod_list(dev);
1356 }
1357 error:
1358 dev_kfree_skb(resp);
1359 return rc;
1360 }
1361
1362 #define PASSIVE_DATA_LEN 5
pn533_poll_dep(struct nfc_dev * nfc_dev)1363 static int pn533_poll_dep(struct nfc_dev *nfc_dev)
1364 {
1365 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1366 struct sk_buff *skb;
1367 int rc, skb_len;
1368 u8 *next, nfcid3[NFC_NFCID3_MAXSIZE];
1369 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1370
1371 dev_dbg(dev->dev, "%s", __func__);
1372
1373 if (!dev->gb) {
1374 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1375
1376 if (!dev->gb || !dev->gb_len) {
1377 dev->poll_dep = 0;
1378 queue_work(dev->wq, &dev->rf_work);
1379 }
1380 }
1381
1382 skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1383 skb_len += PASSIVE_DATA_LEN;
1384
1385 /* NFCID3 */
1386 skb_len += NFC_NFCID3_MAXSIZE;
1387 nfcid3[0] = 0x1;
1388 nfcid3[1] = 0xfe;
1389 get_random_bytes(nfcid3 + 2, 6);
1390
1391 skb = pn533_alloc_skb(dev, skb_len);
1392 if (!skb)
1393 return -ENOMEM;
1394
1395 skb_put_u8(skb, 0x01); /* Active */
1396 skb_put_u8(skb, 0x02); /* 424 kbps */
1397
1398 next = skb_put(skb, 1); /* Next */
1399 *next = 0;
1400
1401 /* Copy passive data */
1402 skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
1403 *next |= 1;
1404
1405 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1406 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
1407 *next |= 2;
1408
1409 skb_put_data(skb, dev->gb, dev->gb_len);
1410 *next |= 4; /* We have some Gi */
1411
1412 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1413 pn533_poll_dep_complete, NULL);
1414
1415 if (rc < 0)
1416 dev_kfree_skb(skb);
1417
1418 return rc;
1419 }
1420
pn533_autopoll_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1421 static int pn533_autopoll_complete(struct pn533 *dev, void *arg,
1422 struct sk_buff *resp)
1423 {
1424 struct pn532_autopoll_resp *apr;
1425 struct nfc_target nfc_tgt;
1426 u8 nbtg;
1427 int rc;
1428
1429 if (IS_ERR(resp)) {
1430 rc = PTR_ERR(resp);
1431
1432 nfc_err(dev->dev, "%s autopoll complete error %d\n",
1433 __func__, rc);
1434
1435 if (rc == -ENOENT) {
1436 if (dev->poll_mod_count != 0)
1437 return rc;
1438 goto stop_poll;
1439 } else if (rc < 0) {
1440 nfc_err(dev->dev,
1441 "Error %d when running autopoll\n", rc);
1442 goto stop_poll;
1443 }
1444 }
1445
1446 nbtg = resp->data[0];
1447 if ((nbtg > 2) || (nbtg <= 0))
1448 return -EAGAIN;
1449
1450 apr = (struct pn532_autopoll_resp *)&resp->data[1];
1451 while (nbtg--) {
1452 memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1453 switch (apr->type) {
1454 case PN532_AUTOPOLL_TYPE_ISOA:
1455 dev_dbg(dev->dev, "ISOA\n");
1456 rc = pn533_target_found_type_a(&nfc_tgt, apr->tgdata,
1457 apr->ln - 1);
1458 break;
1459 case PN532_AUTOPOLL_TYPE_FELICA212:
1460 case PN532_AUTOPOLL_TYPE_FELICA424:
1461 dev_dbg(dev->dev, "FELICA\n");
1462 rc = pn533_target_found_felica(&nfc_tgt, apr->tgdata,
1463 apr->ln - 1);
1464 break;
1465 case PN532_AUTOPOLL_TYPE_JEWEL:
1466 dev_dbg(dev->dev, "JEWEL\n");
1467 rc = pn533_target_found_jewel(&nfc_tgt, apr->tgdata,
1468 apr->ln - 1);
1469 break;
1470 case PN532_AUTOPOLL_TYPE_ISOB:
1471 dev_dbg(dev->dev, "ISOB\n");
1472 rc = pn533_target_found_type_b(&nfc_tgt, apr->tgdata,
1473 apr->ln - 1);
1474 break;
1475 case PN532_AUTOPOLL_TYPE_MIFARE:
1476 dev_dbg(dev->dev, "Mifare\n");
1477 rc = pn533_target_found_type_a(&nfc_tgt, apr->tgdata,
1478 apr->ln - 1);
1479 break;
1480 default:
1481 nfc_err(dev->dev,
1482 "Unknown current poll modulation\n");
1483 rc = -EPROTO;
1484 }
1485
1486 if (rc)
1487 goto done;
1488
1489 if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1490 nfc_err(dev->dev,
1491 "The Tg found doesn't have the desired protocol\n");
1492 rc = -EAGAIN;
1493 goto done;
1494 }
1495
1496 dev->tgt_available_prots = nfc_tgt.supported_protocols;
1497 apr = (struct pn532_autopoll_resp *)
1498 (apr->tgdata + (apr->ln - 1));
1499 }
1500
1501 pn533_poll_reset_mod_list(dev);
1502 nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1503
1504 done:
1505 dev_kfree_skb(resp);
1506 return rc;
1507
1508 stop_poll:
1509 nfc_err(dev->dev, "autopoll operation has been stopped\n");
1510
1511 pn533_poll_reset_mod_list(dev);
1512 dev->poll_protocols = 0;
1513 return rc;
1514 }
1515
pn533_poll_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1516 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1517 struct sk_buff *resp)
1518 {
1519 struct pn533_poll_modulations *cur_mod;
1520 int rc;
1521
1522 dev_dbg(dev->dev, "%s\n", __func__);
1523
1524 if (IS_ERR(resp)) {
1525 rc = PTR_ERR(resp);
1526
1527 nfc_err(dev->dev, "%s Poll complete error %d\n",
1528 __func__, rc);
1529
1530 if (rc == -ENOENT) {
1531 if (dev->poll_mod_count != 0)
1532 return rc;
1533 goto stop_poll;
1534 } else if (rc < 0) {
1535 nfc_err(dev->dev,
1536 "Error %d when running poll\n", rc);
1537 goto stop_poll;
1538 }
1539 }
1540
1541 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1542
1543 if (cur_mod->len == 0) { /* Target mode */
1544 del_timer(&dev->listen_timer);
1545 rc = pn533_init_target_complete(dev, resp);
1546 goto done;
1547 }
1548
1549 /* Initiator mode */
1550 rc = pn533_start_poll_complete(dev, resp);
1551 if (!rc)
1552 goto done;
1553
1554 if (!dev->poll_mod_count) {
1555 dev_dbg(dev->dev, "Polling has been stopped\n");
1556 goto done;
1557 }
1558
1559 pn533_poll_next_mod(dev);
1560 /* Not target found, turn radio off */
1561 queue_work(dev->wq, &dev->rf_work);
1562
1563 done:
1564 dev_kfree_skb(resp);
1565 return rc;
1566
1567 stop_poll:
1568 nfc_err(dev->dev, "Polling operation has been stopped\n");
1569
1570 pn533_poll_reset_mod_list(dev);
1571 dev->poll_protocols = 0;
1572 return rc;
1573 }
1574
pn533_alloc_poll_in_frame(struct pn533 * dev,struct pn533_poll_modulations * mod)1575 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1576 struct pn533_poll_modulations *mod)
1577 {
1578 struct sk_buff *skb;
1579
1580 skb = pn533_alloc_skb(dev, mod->len);
1581 if (!skb)
1582 return NULL;
1583
1584 skb_put_data(skb, &mod->data, mod->len);
1585
1586 return skb;
1587 }
1588
pn533_send_poll_frame(struct pn533 * dev)1589 static int pn533_send_poll_frame(struct pn533 *dev)
1590 {
1591 struct pn533_poll_modulations *mod;
1592 struct sk_buff *skb;
1593 int rc;
1594 u8 cmd_code;
1595
1596 mod = dev->poll_mod_active[dev->poll_mod_curr];
1597
1598 dev_dbg(dev->dev, "%s mod len %d\n",
1599 __func__, mod->len);
1600
1601 if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep) {
1602 dev->poll_dep = 0;
1603 return pn533_poll_dep(dev->nfc_dev);
1604 }
1605
1606 if (mod->len == 0) { /* Listen mode */
1607 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1608 skb = pn533_alloc_poll_tg_frame(dev);
1609 } else { /* Polling mode */
1610 cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET;
1611 skb = pn533_alloc_poll_in_frame(dev, mod);
1612 }
1613
1614 if (!skb) {
1615 nfc_err(dev->dev, "Failed to allocate skb\n");
1616 return -ENOMEM;
1617 }
1618
1619 rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1620 NULL);
1621 if (rc < 0) {
1622 dev_kfree_skb(skb);
1623 nfc_err(dev->dev, "Polling loop error %d\n", rc);
1624 }
1625
1626 return rc;
1627 }
1628
pn533_wq_poll(struct work_struct * work)1629 static void pn533_wq_poll(struct work_struct *work)
1630 {
1631 struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1632 struct pn533_poll_modulations *cur_mod;
1633 int rc;
1634
1635 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1636
1637 dev_dbg(dev->dev,
1638 "%s cancel_listen %d modulation len %d\n",
1639 __func__, dev->cancel_listen, cur_mod->len);
1640
1641 if (dev->cancel_listen == 1) {
1642 dev->cancel_listen = 0;
1643 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC);
1644 }
1645
1646 rc = pn533_send_poll_frame(dev);
1647 if (rc)
1648 return;
1649
1650 if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1651 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1652 }
1653
pn533_start_poll(struct nfc_dev * nfc_dev,u32 im_protocols,u32 tm_protocols)1654 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1655 u32 im_protocols, u32 tm_protocols)
1656 {
1657 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1658 struct pn533_poll_modulations *cur_mod;
1659 struct sk_buff *skb;
1660 u8 rand_mod;
1661 int rc;
1662
1663 dev_dbg(dev->dev,
1664 "%s: im protocols 0x%x tm protocols 0x%x\n",
1665 __func__, im_protocols, tm_protocols);
1666
1667 if (dev->tgt_active_prot) {
1668 nfc_err(dev->dev,
1669 "Cannot poll with a target already activated\n");
1670 return -EBUSY;
1671 }
1672
1673 if (dev->tgt_mode) {
1674 nfc_err(dev->dev,
1675 "Cannot poll while already being activated\n");
1676 return -EBUSY;
1677 }
1678
1679 if (tm_protocols) {
1680 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1681 if (dev->gb == NULL)
1682 tm_protocols = 0;
1683 }
1684
1685 dev->poll_protocols = im_protocols;
1686 dev->listen_protocols = tm_protocols;
1687 if (dev->device_type == PN533_DEVICE_PN532_AUTOPOLL) {
1688 skb = pn533_alloc_skb(dev, 4 + 6);
1689 if (!skb)
1690 return -ENOMEM;
1691
1692 *((u8 *)skb_put(skb, sizeof(u8))) =
1693 PN532_AUTOPOLL_POLLNR_INFINITE;
1694 *((u8 *)skb_put(skb, sizeof(u8))) = PN532_AUTOPOLL_PERIOD;
1695
1696 if ((im_protocols & NFC_PROTO_MIFARE_MASK) &&
1697 (im_protocols & NFC_PROTO_ISO14443_MASK) &&
1698 (im_protocols & NFC_PROTO_NFC_DEP_MASK))
1699 *((u8 *)skb_put(skb, sizeof(u8))) =
1700 PN532_AUTOPOLL_TYPE_GENERIC_106;
1701 else {
1702 if (im_protocols & NFC_PROTO_MIFARE_MASK)
1703 *((u8 *)skb_put(skb, sizeof(u8))) =
1704 PN532_AUTOPOLL_TYPE_MIFARE;
1705
1706 if (im_protocols & NFC_PROTO_ISO14443_MASK)
1707 *((u8 *)skb_put(skb, sizeof(u8))) =
1708 PN532_AUTOPOLL_TYPE_ISOA;
1709
1710 if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1711 *((u8 *)skb_put(skb, sizeof(u8))) =
1712 PN532_AUTOPOLL_TYPE_DEP_PASSIVE_106;
1713 *((u8 *)skb_put(skb, sizeof(u8))) =
1714 PN532_AUTOPOLL_TYPE_DEP_PASSIVE_212;
1715 *((u8 *)skb_put(skb, sizeof(u8))) =
1716 PN532_AUTOPOLL_TYPE_DEP_PASSIVE_424;
1717 }
1718 }
1719
1720 if (im_protocols & NFC_PROTO_FELICA_MASK ||
1721 im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1722 *((u8 *)skb_put(skb, sizeof(u8))) =
1723 PN532_AUTOPOLL_TYPE_FELICA212;
1724 *((u8 *)skb_put(skb, sizeof(u8))) =
1725 PN532_AUTOPOLL_TYPE_FELICA424;
1726 }
1727
1728 if (im_protocols & NFC_PROTO_JEWEL_MASK)
1729 *((u8 *)skb_put(skb, sizeof(u8))) =
1730 PN532_AUTOPOLL_TYPE_JEWEL;
1731
1732 if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1733 *((u8 *)skb_put(skb, sizeof(u8))) =
1734 PN532_AUTOPOLL_TYPE_ISOB;
1735
1736 if (tm_protocols)
1737 *((u8 *)skb_put(skb, sizeof(u8))) =
1738 PN532_AUTOPOLL_TYPE_DEP_ACTIVE_106;
1739
1740 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_AUTOPOLL, skb,
1741 pn533_autopoll_complete, NULL);
1742
1743 if (rc < 0)
1744 dev_kfree_skb(skb);
1745 else
1746 dev->poll_mod_count++;
1747
1748 return rc;
1749 }
1750
1751 pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1752
1753 /* Do not always start polling from the same modulation */
1754 get_random_bytes(&rand_mod, sizeof(rand_mod));
1755 rand_mod %= dev->poll_mod_count;
1756 dev->poll_mod_curr = rand_mod;
1757
1758 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1759
1760 rc = pn533_send_poll_frame(dev);
1761
1762 /* Start listen timer */
1763 if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
1764 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1765
1766 return rc;
1767 }
1768
pn533_stop_poll(struct nfc_dev * nfc_dev)1769 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1770 {
1771 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1772
1773 del_timer(&dev->listen_timer);
1774
1775 if (!dev->poll_mod_count) {
1776 dev_dbg(dev->dev,
1777 "Polling operation was not running\n");
1778 return;
1779 }
1780
1781 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1782 flush_delayed_work(&dev->poll_work);
1783 pn533_poll_reset_mod_list(dev);
1784 }
1785
pn533_activate_target_nfcdep(struct pn533 * dev)1786 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1787 {
1788 struct pn533_cmd_activate_response *rsp;
1789 u16 gt_len;
1790 int rc;
1791 struct sk_buff *skb;
1792 struct sk_buff *resp;
1793
1794 dev_dbg(dev->dev, "%s\n", __func__);
1795
1796 skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1797 if (!skb)
1798 return -ENOMEM;
1799
1800 skb_put_u8(skb, 1); /* TG */
1801 skb_put_u8(skb, 0); /* Next */
1802
1803 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1804 if (IS_ERR(resp))
1805 return PTR_ERR(resp);
1806
1807 rsp = (struct pn533_cmd_activate_response *)resp->data;
1808 rc = rsp->status & PN533_CMD_RET_MASK;
1809 if (rc != PN533_CMD_RET_SUCCESS) {
1810 nfc_err(dev->dev,
1811 "Target activation failed (error 0x%x)\n", rc);
1812 dev_kfree_skb(resp);
1813 return -EIO;
1814 }
1815
1816 /* ATR_RES general bytes are located at offset 16 */
1817 gt_len = resp->len - 16;
1818 rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1819
1820 dev_kfree_skb(resp);
1821 return rc;
1822 }
1823
pn533_activate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,u32 protocol)1824 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1825 struct nfc_target *target, u32 protocol)
1826 {
1827 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1828 int rc;
1829
1830 dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol);
1831
1832 if (dev->poll_mod_count) {
1833 nfc_err(dev->dev,
1834 "Cannot activate while polling\n");
1835 return -EBUSY;
1836 }
1837
1838 if (dev->tgt_active_prot) {
1839 nfc_err(dev->dev,
1840 "There is already an active target\n");
1841 return -EBUSY;
1842 }
1843
1844 if (!dev->tgt_available_prots) {
1845 nfc_err(dev->dev,
1846 "There is no available target to activate\n");
1847 return -EINVAL;
1848 }
1849
1850 if (!(dev->tgt_available_prots & (1 << protocol))) {
1851 nfc_err(dev->dev,
1852 "Target doesn't support requested proto %u\n",
1853 protocol);
1854 return -EINVAL;
1855 }
1856
1857 if (protocol == NFC_PROTO_NFC_DEP) {
1858 rc = pn533_activate_target_nfcdep(dev);
1859 if (rc) {
1860 nfc_err(dev->dev,
1861 "Activating target with DEP failed %d\n", rc);
1862 return rc;
1863 }
1864 }
1865
1866 dev->tgt_active_prot = protocol;
1867 dev->tgt_available_prots = 0;
1868
1869 return 0;
1870 }
1871
pn533_deactivate_target_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1872 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg,
1873 struct sk_buff *resp)
1874 {
1875 int rc = 0;
1876
1877 dev_dbg(dev->dev, "%s\n", __func__);
1878
1879 if (IS_ERR(resp)) {
1880 rc = PTR_ERR(resp);
1881
1882 nfc_err(dev->dev, "Target release error %d\n", rc);
1883
1884 return rc;
1885 }
1886
1887 rc = resp->data[0] & PN533_CMD_RET_MASK;
1888 if (rc != PN533_CMD_RET_SUCCESS)
1889 nfc_err(dev->dev,
1890 "Error 0x%x when releasing the target\n", rc);
1891
1892 dev_kfree_skb(resp);
1893 return rc;
1894 }
1895
pn533_deactivate_target(struct nfc_dev * nfc_dev,struct nfc_target * target,u8 mode)1896 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1897 struct nfc_target *target, u8 mode)
1898 {
1899 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1900 struct sk_buff *skb;
1901 int rc;
1902
1903 dev_dbg(dev->dev, "%s\n", __func__);
1904
1905 if (!dev->tgt_active_prot) {
1906 nfc_err(dev->dev, "There is no active target\n");
1907 return;
1908 }
1909
1910 dev->tgt_active_prot = 0;
1911 skb_queue_purge(&dev->resp_q);
1912
1913 skb = pn533_alloc_skb(dev, sizeof(u8));
1914 if (!skb)
1915 return;
1916
1917 skb_put_u8(skb, 1); /* TG*/
1918
1919 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb,
1920 pn533_deactivate_target_complete, NULL);
1921 if (rc < 0) {
1922 dev_kfree_skb(skb);
1923 nfc_err(dev->dev, "Target release error %d\n", rc);
1924 }
1925 }
1926
1927
pn533_in_dep_link_up_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)1928 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1929 struct sk_buff *resp)
1930 {
1931 struct pn533_cmd_jump_dep_response *rsp;
1932 u8 target_gt_len;
1933 int rc;
1934 u8 active = *(u8 *)arg;
1935
1936 kfree(arg);
1937
1938 if (IS_ERR(resp))
1939 return PTR_ERR(resp);
1940
1941 if (dev->tgt_available_prots &&
1942 !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1943 nfc_err(dev->dev,
1944 "The target does not support DEP\n");
1945 rc = -EINVAL;
1946 goto error;
1947 }
1948
1949 rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1950
1951 rc = rsp->status & PN533_CMD_RET_MASK;
1952 if (rc != PN533_CMD_RET_SUCCESS) {
1953 nfc_err(dev->dev,
1954 "Bringing DEP link up failed (error 0x%x)\n", rc);
1955 goto error;
1956 }
1957
1958 if (!dev->tgt_available_prots) {
1959 struct nfc_target nfc_target;
1960
1961 dev_dbg(dev->dev, "Creating new target\n");
1962
1963 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1964 nfc_target.nfcid1_len = 10;
1965 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1966 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1967 if (rc)
1968 goto error;
1969
1970 dev->tgt_available_prots = 0;
1971 }
1972
1973 dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1974
1975 /* ATR_RES general bytes are located at offset 17 */
1976 target_gt_len = resp->len - 17;
1977 rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1978 rsp->gt, target_gt_len);
1979 if (rc == 0)
1980 rc = nfc_dep_link_is_up(dev->nfc_dev,
1981 dev->nfc_dev->targets[0].idx,
1982 !active, NFC_RF_INITIATOR);
1983
1984 error:
1985 dev_kfree_skb(resp);
1986 return rc;
1987 }
1988
1989 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)1990 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1991 u8 comm_mode, u8 *gb, size_t gb_len)
1992 {
1993 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1994 struct sk_buff *skb;
1995 int rc, skb_len;
1996 u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
1997 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1998
1999 dev_dbg(dev->dev, "%s\n", __func__);
2000
2001 if (dev->poll_mod_count) {
2002 nfc_err(dev->dev,
2003 "Cannot bring the DEP link up while polling\n");
2004 return -EBUSY;
2005 }
2006
2007 if (dev->tgt_active_prot) {
2008 nfc_err(dev->dev,
2009 "There is already an active target\n");
2010 return -EBUSY;
2011 }
2012
2013 skb_len = 3 + gb_len; /* ActPass + BR + Next */
2014 skb_len += PASSIVE_DATA_LEN;
2015
2016 /* NFCID3 */
2017 skb_len += NFC_NFCID3_MAXSIZE;
2018 if (target && !target->nfcid2_len) {
2019 nfcid3[0] = 0x1;
2020 nfcid3[1] = 0xfe;
2021 get_random_bytes(nfcid3 + 2, 6);
2022 }
2023
2024 skb = pn533_alloc_skb(dev, skb_len);
2025 if (!skb)
2026 return -ENOMEM;
2027
2028 skb_put_u8(skb, !comm_mode); /* ActPass */
2029 skb_put_u8(skb, 0x02); /* 424 kbps */
2030
2031 next = skb_put(skb, 1); /* Next */
2032 *next = 0;
2033
2034 /* Copy passive data */
2035 skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
2036 *next |= 1;
2037
2038 /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
2039 if (target && target->nfcid2_len)
2040 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
2041 target->nfcid2_len);
2042 else
2043 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
2044 *next |= 2;
2045
2046 if (gb != NULL && gb_len > 0) {
2047 skb_put_data(skb, gb, gb_len);
2048 *next |= 4; /* We have some Gi */
2049 } else {
2050 *next = 0;
2051 }
2052
2053 arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2054 if (!arg) {
2055 dev_kfree_skb(skb);
2056 return -ENOMEM;
2057 }
2058
2059 *arg = !comm_mode;
2060
2061 pn533_rf_field(dev->nfc_dev, 0);
2062
2063 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
2064 pn533_in_dep_link_up_complete, arg);
2065
2066 if (rc < 0) {
2067 dev_kfree_skb(skb);
2068 kfree(arg);
2069 }
2070
2071 return rc;
2072 }
2073
pn533_dep_link_down(struct nfc_dev * nfc_dev)2074 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
2075 {
2076 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2077
2078 dev_dbg(dev->dev, "%s\n", __func__);
2079
2080 pn533_poll_reset_mod_list(dev);
2081
2082 if (dev->tgt_mode || dev->tgt_active_prot)
2083 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
2084
2085 dev->tgt_active_prot = 0;
2086 dev->tgt_mode = 0;
2087
2088 skb_queue_purge(&dev->resp_q);
2089
2090 return 0;
2091 }
2092
2093 struct pn533_data_exchange_arg {
2094 data_exchange_cb_t cb;
2095 void *cb_context;
2096 };
2097
pn533_build_response(struct pn533 * dev)2098 static struct sk_buff *pn533_build_response(struct pn533 *dev)
2099 {
2100 struct sk_buff *skb, *tmp, *t;
2101 unsigned int skb_len = 0, tmp_len = 0;
2102
2103 dev_dbg(dev->dev, "%s\n", __func__);
2104
2105 if (skb_queue_empty(&dev->resp_q))
2106 return NULL;
2107
2108 if (skb_queue_len(&dev->resp_q) == 1) {
2109 skb = skb_dequeue(&dev->resp_q);
2110 goto out;
2111 }
2112
2113 skb_queue_walk_safe(&dev->resp_q, tmp, t)
2114 skb_len += tmp->len;
2115
2116 dev_dbg(dev->dev, "%s total length %d\n",
2117 __func__, skb_len);
2118
2119 skb = alloc_skb(skb_len, GFP_KERNEL);
2120 if (skb == NULL)
2121 goto out;
2122
2123 skb_put(skb, skb_len);
2124
2125 skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2126 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2127 tmp_len += tmp->len;
2128 }
2129
2130 out:
2131 skb_queue_purge(&dev->resp_q);
2132
2133 return skb;
2134 }
2135
pn533_data_exchange_complete(struct pn533 * dev,void * _arg,struct sk_buff * resp)2136 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2137 struct sk_buff *resp)
2138 {
2139 struct pn533_data_exchange_arg *arg = _arg;
2140 struct sk_buff *skb;
2141 int rc = 0;
2142 u8 status, ret, mi;
2143
2144 dev_dbg(dev->dev, "%s\n", __func__);
2145
2146 if (IS_ERR(resp)) {
2147 rc = PTR_ERR(resp);
2148 goto _error;
2149 }
2150
2151 status = resp->data[0];
2152 ret = status & PN533_CMD_RET_MASK;
2153 mi = status & PN533_CMD_MI_MASK;
2154
2155 skb_pull(resp, sizeof(status));
2156
2157 if (ret != PN533_CMD_RET_SUCCESS) {
2158 nfc_err(dev->dev,
2159 "Exchanging data failed (error 0x%x)\n", ret);
2160 rc = -EIO;
2161 goto error;
2162 }
2163
2164 skb_queue_tail(&dev->resp_q, resp);
2165
2166 if (mi) {
2167 dev->cmd_complete_mi_arg = arg;
2168 queue_work(dev->wq, &dev->mi_rx_work);
2169 return -EINPROGRESS;
2170 }
2171
2172 /* Prepare for the next round */
2173 if (skb_queue_len(&dev->fragment_skb) > 0) {
2174 dev->cmd_complete_dep_arg = arg;
2175 queue_work(dev->wq, &dev->mi_tx_work);
2176
2177 return -EINPROGRESS;
2178 }
2179
2180 skb = pn533_build_response(dev);
2181 if (!skb) {
2182 rc = -ENOMEM;
2183 goto error;
2184 }
2185
2186 arg->cb(arg->cb_context, skb, 0);
2187 kfree(arg);
2188 return 0;
2189
2190 error:
2191 dev_kfree_skb(resp);
2192 _error:
2193 skb_queue_purge(&dev->resp_q);
2194 arg->cb(arg->cb_context, NULL, rc);
2195 kfree(arg);
2196 return rc;
2197 }
2198
2199 /*
2200 * Receive an incoming pn533 frame. skb contains only header and payload.
2201 * If skb == NULL, it is a notification that the link below is dead.
2202 */
pn533_recv_frame(struct pn533 * dev,struct sk_buff * skb,int status)2203 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2204 {
2205 if (!dev->cmd)
2206 goto sched_wq;
2207
2208 dev->cmd->status = status;
2209
2210 if (status != 0) {
2211 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2212 goto sched_wq;
2213 }
2214
2215 if (skb == NULL) {
2216 pr_err("NULL Frame -> link is dead\n");
2217 goto sched_wq;
2218 }
2219
2220 if (pn533_rx_frame_is_ack(skb->data)) {
2221 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2222 dev_kfree_skb(skb);
2223 return;
2224 }
2225
2226 print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2227 dev->ops->rx_frame_size(skb->data), false);
2228
2229 if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2230 nfc_err(dev->dev, "Received an invalid frame\n");
2231 dev->cmd->status = -EIO;
2232 } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2233 nfc_err(dev->dev, "It it not the response to the last command\n");
2234 dev->cmd->status = -EIO;
2235 }
2236
2237 dev->cmd->resp = skb;
2238
2239 sched_wq:
2240 queue_work(dev->wq, &dev->cmd_complete_work);
2241 }
2242 EXPORT_SYMBOL(pn533_recv_frame);
2243
2244 /* Split the Tx skb into small chunks */
pn533_fill_fragment_skbs(struct pn533 * dev,struct sk_buff * skb)2245 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2246 {
2247 struct sk_buff *frag;
2248 int frag_size;
2249
2250 do {
2251 /* Remaining size */
2252 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2253 frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2254 else
2255 frag_size = skb->len;
2256
2257 /* Allocate and reserve */
2258 frag = pn533_alloc_skb(dev, frag_size);
2259 if (!frag) {
2260 skb_queue_purge(&dev->fragment_skb);
2261 return -ENOMEM;
2262 }
2263
2264 if (!dev->tgt_mode) {
2265 /* Reserve the TG/MI byte */
2266 skb_reserve(frag, 1);
2267
2268 /* MI + TG */
2269 if (frag_size == PN533_CMD_DATAFRAME_MAXLEN)
2270 *(u8 *)skb_push(frag, sizeof(u8)) =
2271 (PN533_CMD_MI_MASK | 1);
2272 else
2273 *(u8 *)skb_push(frag, sizeof(u8)) = 1; /* TG */
2274 }
2275
2276 skb_put_data(frag, skb->data, frag_size);
2277
2278 /* Reduce the size of incoming buffer */
2279 skb_pull(skb, frag_size);
2280
2281 /* Add this to skb_queue */
2282 skb_queue_tail(&dev->fragment_skb, frag);
2283
2284 } while (skb->len > 0);
2285
2286 dev_kfree_skb(skb);
2287
2288 return skb_queue_len(&dev->fragment_skb);
2289 }
2290
pn533_transceive(struct nfc_dev * nfc_dev,struct nfc_target * target,struct sk_buff * skb,data_exchange_cb_t cb,void * cb_context)2291 static int pn533_transceive(struct nfc_dev *nfc_dev,
2292 struct nfc_target *target, struct sk_buff *skb,
2293 data_exchange_cb_t cb, void *cb_context)
2294 {
2295 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2296 struct pn533_data_exchange_arg *arg = NULL;
2297 int rc;
2298
2299 dev_dbg(dev->dev, "%s\n", __func__);
2300
2301 if (!dev->tgt_active_prot) {
2302 nfc_err(dev->dev,
2303 "Can't exchange data if there is no active target\n");
2304 rc = -EINVAL;
2305 goto error;
2306 }
2307
2308 arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2309 if (!arg) {
2310 rc = -ENOMEM;
2311 goto error;
2312 }
2313
2314 arg->cb = cb;
2315 arg->cb_context = cb_context;
2316
2317 switch (dev->device_type) {
2318 case PN533_DEVICE_PASORI:
2319 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2320 rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2321 skb,
2322 pn533_data_exchange_complete,
2323 arg);
2324
2325 break;
2326 }
2327 fallthrough;
2328 default:
2329 /* jumbo frame ? */
2330 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2331 rc = pn533_fill_fragment_skbs(dev, skb);
2332 if (rc < 0)
2333 goto error;
2334
2335 skb = skb_dequeue(&dev->fragment_skb);
2336 if (!skb) {
2337 rc = -EIO;
2338 goto error;
2339 }
2340 } else {
2341 *(u8 *)skb_push(skb, sizeof(u8)) = 1; /* TG */
2342 }
2343
2344 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2345 skb, pn533_data_exchange_complete,
2346 arg);
2347
2348 break;
2349 }
2350
2351 if (rc < 0) /* rc from send_async */
2352 goto error;
2353
2354 return 0;
2355
2356 error:
2357 kfree(arg);
2358 dev_kfree_skb(skb);
2359 return rc;
2360 }
2361
pn533_tm_send_complete(struct pn533 * dev,void * arg,struct sk_buff * resp)2362 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2363 struct sk_buff *resp)
2364 {
2365 u8 status;
2366
2367 dev_dbg(dev->dev, "%s\n", __func__);
2368
2369 if (IS_ERR(resp))
2370 return PTR_ERR(resp);
2371
2372 status = resp->data[0];
2373
2374 /* Prepare for the next round */
2375 if (skb_queue_len(&dev->fragment_skb) > 0) {
2376 queue_work(dev->wq, &dev->mi_tm_tx_work);
2377 return -EINPROGRESS;
2378 }
2379 dev_kfree_skb(resp);
2380
2381 if (status != 0) {
2382 nfc_tm_deactivated(dev->nfc_dev);
2383
2384 dev->tgt_mode = 0;
2385
2386 return 0;
2387 }
2388
2389 queue_work(dev->wq, &dev->tg_work);
2390
2391 return 0;
2392 }
2393
pn533_tm_send(struct nfc_dev * nfc_dev,struct sk_buff * skb)2394 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2395 {
2396 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2397 int rc;
2398
2399 dev_dbg(dev->dev, "%s\n", __func__);
2400
2401 /* let's split in multiple chunks if size's too big */
2402 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2403 rc = pn533_fill_fragment_skbs(dev, skb);
2404 if (rc < 0)
2405 goto error;
2406
2407 /* get the first skb */
2408 skb = skb_dequeue(&dev->fragment_skb);
2409 if (!skb) {
2410 rc = -EIO;
2411 goto error;
2412 }
2413
2414 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2415 pn533_tm_send_complete, NULL);
2416 } else {
2417 /* Send th skb */
2418 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2419 pn533_tm_send_complete, NULL);
2420 }
2421
2422 error:
2423 if (rc < 0) {
2424 dev_kfree_skb(skb);
2425 skb_queue_purge(&dev->fragment_skb);
2426 }
2427
2428 return rc;
2429 }
2430
pn533_wq_mi_recv(struct work_struct * work)2431 static void pn533_wq_mi_recv(struct work_struct *work)
2432 {
2433 struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2434 struct sk_buff *skb;
2435 int rc;
2436
2437 dev_dbg(dev->dev, "%s\n", __func__);
2438
2439 skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2440 if (!skb)
2441 goto error;
2442
2443 switch (dev->device_type) {
2444 case PN533_DEVICE_PASORI:
2445 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2446 rc = pn533_send_cmd_direct_async(dev,
2447 PN533_CMD_IN_COMM_THRU,
2448 skb,
2449 pn533_data_exchange_complete,
2450 dev->cmd_complete_mi_arg);
2451
2452 break;
2453 }
2454 fallthrough;
2455 default:
2456 skb_put_u8(skb, 1); /*TG*/
2457
2458 rc = pn533_send_cmd_direct_async(dev,
2459 PN533_CMD_IN_DATA_EXCHANGE,
2460 skb,
2461 pn533_data_exchange_complete,
2462 dev->cmd_complete_mi_arg);
2463
2464 break;
2465 }
2466
2467 if (rc == 0) /* success */
2468 return;
2469
2470 nfc_err(dev->dev,
2471 "Error %d when trying to perform data_exchange\n", rc);
2472
2473 dev_kfree_skb(skb);
2474 kfree(dev->cmd_complete_mi_arg);
2475
2476 error:
2477 dev->phy_ops->send_ack(dev, GFP_KERNEL);
2478 queue_work(dev->wq, &dev->cmd_work);
2479 }
2480
pn533_wq_mi_send(struct work_struct * work)2481 static void pn533_wq_mi_send(struct work_struct *work)
2482 {
2483 struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2484 struct sk_buff *skb;
2485 int rc;
2486
2487 dev_dbg(dev->dev, "%s\n", __func__);
2488
2489 /* Grab the first skb in the queue */
2490 skb = skb_dequeue(&dev->fragment_skb);
2491
2492 if (skb == NULL) { /* No more data */
2493 /* Reset the queue for future use */
2494 skb_queue_head_init(&dev->fragment_skb);
2495 goto error;
2496 }
2497
2498 switch (dev->device_type) {
2499 case PN533_DEVICE_PASORI:
2500 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2501 rc = -EIO;
2502 break;
2503 }
2504
2505 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2506 skb,
2507 pn533_data_exchange_complete,
2508 dev->cmd_complete_dep_arg);
2509
2510 break;
2511
2512 default:
2513 /* Still some fragments? */
2514 rc = pn533_send_cmd_direct_async(dev,
2515 PN533_CMD_IN_DATA_EXCHANGE,
2516 skb,
2517 pn533_data_exchange_complete,
2518 dev->cmd_complete_dep_arg);
2519
2520 break;
2521 }
2522
2523 if (rc == 0) /* success */
2524 return;
2525
2526 nfc_err(dev->dev,
2527 "Error %d when trying to perform data_exchange\n", rc);
2528
2529 dev_kfree_skb(skb);
2530 kfree(dev->cmd_complete_dep_arg);
2531
2532 error:
2533 dev->phy_ops->send_ack(dev, GFP_KERNEL);
2534 queue_work(dev->wq, &dev->cmd_work);
2535 }
2536
pn533_set_configuration(struct pn533 * dev,u8 cfgitem,u8 * cfgdata,u8 cfgdata_len)2537 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2538 u8 cfgdata_len)
2539 {
2540 struct sk_buff *skb;
2541 struct sk_buff *resp;
2542 int skb_len;
2543
2544 dev_dbg(dev->dev, "%s\n", __func__);
2545
2546 skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2547
2548 skb = pn533_alloc_skb(dev, skb_len);
2549 if (!skb)
2550 return -ENOMEM;
2551
2552 skb_put_u8(skb, cfgitem);
2553 skb_put_data(skb, cfgdata, cfgdata_len);
2554
2555 resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2556 if (IS_ERR(resp))
2557 return PTR_ERR(resp);
2558
2559 dev_kfree_skb(resp);
2560 return 0;
2561 }
2562
pn533_get_firmware_version(struct pn533 * dev,struct pn533_fw_version * fv)2563 static int pn533_get_firmware_version(struct pn533 *dev,
2564 struct pn533_fw_version *fv)
2565 {
2566 struct sk_buff *skb;
2567 struct sk_buff *resp;
2568
2569 skb = pn533_alloc_skb(dev, 0);
2570 if (!skb)
2571 return -ENOMEM;
2572
2573 resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2574 if (IS_ERR(resp))
2575 return PTR_ERR(resp);
2576
2577 fv->ic = resp->data[0];
2578 fv->ver = resp->data[1];
2579 fv->rev = resp->data[2];
2580 fv->support = resp->data[3];
2581
2582 dev_kfree_skb(resp);
2583 return 0;
2584 }
2585
pn533_pasori_fw_reset(struct pn533 * dev)2586 static int pn533_pasori_fw_reset(struct pn533 *dev)
2587 {
2588 struct sk_buff *skb;
2589 struct sk_buff *resp;
2590
2591 dev_dbg(dev->dev, "%s\n", __func__);
2592
2593 skb = pn533_alloc_skb(dev, sizeof(u8));
2594 if (!skb)
2595 return -ENOMEM;
2596
2597 skb_put_u8(skb, 0x1);
2598
2599 resp = pn533_send_cmd_sync(dev, 0x18, skb);
2600 if (IS_ERR(resp))
2601 return PTR_ERR(resp);
2602
2603 dev_kfree_skb(resp);
2604
2605 return 0;
2606 }
2607
pn533_rf_field(struct nfc_dev * nfc_dev,u8 rf)2608 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2609 {
2610 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2611 u8 rf_field = !!rf;
2612 int rc;
2613
2614 rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2615
2616 rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2617 (u8 *)&rf_field, 1);
2618 if (rc) {
2619 nfc_err(dev->dev, "Error on setting RF field\n");
2620 return rc;
2621 }
2622
2623 return rc;
2624 }
2625
pn532_sam_configuration(struct nfc_dev * nfc_dev)2626 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2627 {
2628 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2629 struct sk_buff *skb;
2630 struct sk_buff *resp;
2631
2632 skb = pn533_alloc_skb(dev, 1);
2633 if (!skb)
2634 return -ENOMEM;
2635
2636 skb_put_u8(skb, 0x01);
2637
2638 resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2639 if (IS_ERR(resp))
2640 return PTR_ERR(resp);
2641
2642 dev_kfree_skb(resp);
2643 return 0;
2644 }
2645
pn533_dev_up(struct nfc_dev * nfc_dev)2646 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2647 {
2648 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2649 int rc;
2650
2651 if (dev->phy_ops->dev_up) {
2652 rc = dev->phy_ops->dev_up(dev);
2653 if (rc)
2654 return rc;
2655 }
2656
2657 if ((dev->device_type == PN533_DEVICE_PN532) ||
2658 (dev->device_type == PN533_DEVICE_PN532_AUTOPOLL)) {
2659 rc = pn532_sam_configuration(nfc_dev);
2660
2661 if (rc)
2662 return rc;
2663 }
2664
2665 return pn533_rf_field(nfc_dev, 1);
2666 }
2667
pn533_dev_down(struct nfc_dev * nfc_dev)2668 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2669 {
2670 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2671 int ret;
2672
2673 ret = pn533_rf_field(nfc_dev, 0);
2674 if (dev->phy_ops->dev_down && !ret)
2675 ret = dev->phy_ops->dev_down(dev);
2676
2677 return ret;
2678 }
2679
2680 static struct nfc_ops pn533_nfc_ops = {
2681 .dev_up = pn533_dev_up,
2682 .dev_down = pn533_dev_down,
2683 .dep_link_up = pn533_dep_link_up,
2684 .dep_link_down = pn533_dep_link_down,
2685 .start_poll = pn533_start_poll,
2686 .stop_poll = pn533_stop_poll,
2687 .activate_target = pn533_activate_target,
2688 .deactivate_target = pn533_deactivate_target,
2689 .im_transceive = pn533_transceive,
2690 .tm_send = pn533_tm_send,
2691 };
2692
pn533_setup(struct pn533 * dev)2693 static int pn533_setup(struct pn533 *dev)
2694 {
2695 struct pn533_config_max_retries max_retries;
2696 struct pn533_config_timing timing;
2697 u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2698 int rc;
2699
2700 switch (dev->device_type) {
2701 case PN533_DEVICE_STD:
2702 case PN533_DEVICE_PASORI:
2703 case PN533_DEVICE_ACR122U:
2704 case PN533_DEVICE_PN532:
2705 case PN533_DEVICE_PN532_AUTOPOLL:
2706 max_retries.mx_rty_atr = 0x2;
2707 max_retries.mx_rty_psl = 0x1;
2708 max_retries.mx_rty_passive_act =
2709 PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2710
2711 timing.rfu = PN533_CONFIG_TIMING_102;
2712 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2713 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2714
2715 break;
2716
2717 default:
2718 nfc_err(dev->dev, "Unknown device type %d\n",
2719 dev->device_type);
2720 return -EINVAL;
2721 }
2722
2723 rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2724 (u8 *)&max_retries, sizeof(max_retries));
2725 if (rc) {
2726 nfc_err(dev->dev,
2727 "Error on setting MAX_RETRIES config\n");
2728 return rc;
2729 }
2730
2731
2732 rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2733 (u8 *)&timing, sizeof(timing));
2734 if (rc) {
2735 nfc_err(dev->dev, "Error on setting RF timings\n");
2736 return rc;
2737 }
2738
2739 switch (dev->device_type) {
2740 case PN533_DEVICE_STD:
2741 case PN533_DEVICE_PN532:
2742 case PN533_DEVICE_PN532_AUTOPOLL:
2743 break;
2744
2745 case PN533_DEVICE_PASORI:
2746 pn533_pasori_fw_reset(dev);
2747
2748 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2749 pasori_cfg, 3);
2750 if (rc) {
2751 nfc_err(dev->dev,
2752 "Error while settings PASORI config\n");
2753 return rc;
2754 }
2755
2756 pn533_pasori_fw_reset(dev);
2757
2758 break;
2759 }
2760
2761 return 0;
2762 }
2763
pn533_finalize_setup(struct pn533 * dev)2764 int pn533_finalize_setup(struct pn533 *dev)
2765 {
2766
2767 struct pn533_fw_version fw_ver;
2768 int rc;
2769
2770 memset(&fw_ver, 0, sizeof(fw_ver));
2771
2772 rc = pn533_get_firmware_version(dev, &fw_ver);
2773 if (rc) {
2774 nfc_err(dev->dev, "Unable to get FW version\n");
2775 return rc;
2776 }
2777
2778 nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2779 fw_ver.ic, fw_ver.ver, fw_ver.rev);
2780
2781 rc = pn533_setup(dev);
2782 if (rc)
2783 return rc;
2784
2785 return 0;
2786 }
2787 EXPORT_SYMBOL_GPL(pn533_finalize_setup);
2788
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)2789 struct pn533 *pn53x_common_init(u32 device_type,
2790 enum pn533_protocol_type protocol_type,
2791 void *phy,
2792 struct pn533_phy_ops *phy_ops,
2793 struct pn533_frame_ops *fops,
2794 struct device *dev)
2795 {
2796 struct pn533 *priv;
2797 int rc = -ENOMEM;
2798
2799 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2800 if (!priv)
2801 return ERR_PTR(-ENOMEM);
2802
2803 priv->phy = phy;
2804 priv->phy_ops = phy_ops;
2805 priv->dev = dev;
2806 if (fops != NULL)
2807 priv->ops = fops;
2808 else
2809 priv->ops = &pn533_std_frame_ops;
2810
2811 priv->protocol_type = protocol_type;
2812 priv->device_type = device_type;
2813
2814 mutex_init(&priv->cmd_lock);
2815
2816 INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2817 INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2818 INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2819 INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2820 INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2821 INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2822 INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2823 INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2824 INIT_WORK(&priv->rf_work, pn533_wq_rf);
2825 priv->wq = alloc_ordered_workqueue("pn533", 0);
2826 if (priv->wq == NULL)
2827 goto error;
2828
2829 timer_setup(&priv->listen_timer, pn533_listen_mode_timer, 0);
2830
2831 skb_queue_head_init(&priv->resp_q);
2832 skb_queue_head_init(&priv->fragment_skb);
2833
2834 INIT_LIST_HEAD(&priv->cmd_queue);
2835 return priv;
2836
2837 error:
2838 kfree(priv);
2839 return ERR_PTR(rc);
2840 }
2841 EXPORT_SYMBOL_GPL(pn53x_common_init);
2842
pn53x_common_clean(struct pn533 * priv)2843 void pn53x_common_clean(struct pn533 *priv)
2844 {
2845 struct pn533_cmd *cmd, *n;
2846
2847 flush_delayed_work(&priv->poll_work);
2848 destroy_workqueue(priv->wq);
2849
2850 skb_queue_purge(&priv->resp_q);
2851
2852 del_timer(&priv->listen_timer);
2853
2854 list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2855 list_del(&cmd->queue);
2856 kfree(cmd);
2857 }
2858
2859 kfree(priv);
2860 }
2861 EXPORT_SYMBOL_GPL(pn53x_common_clean);
2862
pn532_i2c_nfc_alloc(struct pn533 * priv,u32 protocols,struct device * parent)2863 int pn532_i2c_nfc_alloc(struct pn533 *priv, u32 protocols,
2864 struct device *parent)
2865 {
2866 priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2867 priv->ops->tx_header_len +
2868 PN533_CMD_DATAEXCH_HEAD_LEN,
2869 priv->ops->tx_tail_len);
2870 if (!priv->nfc_dev)
2871 return -ENOMEM;
2872
2873 nfc_set_parent_dev(priv->nfc_dev, parent);
2874 nfc_set_drvdata(priv->nfc_dev, priv);
2875 return 0;
2876 }
2877 EXPORT_SYMBOL_GPL(pn532_i2c_nfc_alloc);
2878
pn53x_register_nfc(struct pn533 * priv,u32 protocols,struct device * parent)2879 int pn53x_register_nfc(struct pn533 *priv, u32 protocols,
2880 struct device *parent)
2881 {
2882 int rc;
2883
2884 rc = pn532_i2c_nfc_alloc(priv, protocols, parent);
2885 if (rc)
2886 return rc;
2887
2888 rc = nfc_register_device(priv->nfc_dev);
2889 if (rc)
2890 nfc_free_device(priv->nfc_dev);
2891
2892 return rc;
2893 }
2894 EXPORT_SYMBOL_GPL(pn53x_register_nfc);
2895
pn53x_unregister_nfc(struct pn533 * priv)2896 void pn53x_unregister_nfc(struct pn533 *priv)
2897 {
2898 nfc_unregister_device(priv->nfc_dev);
2899 nfc_free_device(priv->nfc_dev);
2900 }
2901 EXPORT_SYMBOL_GPL(pn53x_unregister_nfc);
2902
2903 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
2904 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2905 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
2906 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2907 MODULE_VERSION(VERSION);
2908 MODULE_LICENSE("GPL");
2909