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[mirror_ubuntu-zesty-kernel.git] / drivers / nfc / pn533.c
1 /*
2 * Copyright (C) 2011 Instituto Nokia de Tecnologia
3 *
4 * Authors:
5 * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
6 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the
20 * Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 */
23
24 #include <linux/device.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/usb.h>
29 #include <linux/nfc.h>
30 #include <linux/netdevice.h>
31 #include <net/nfc/nfc.h>
32
33 #define VERSION "0.1"
34
35 #define PN533_VENDOR_ID 0x4CC
36 #define PN533_PRODUCT_ID 0x2533
37
38 #define SCM_VENDOR_ID 0x4E6
39 #define SCL3711_PRODUCT_ID 0x5591
40
41 #define SONY_VENDOR_ID 0x054c
42 #define PASORI_PRODUCT_ID 0x02e1
43
44 #define PN533_DEVICE_STD 0x1
45 #define PN533_DEVICE_PASORI 0x2
46
47 #define PN533_ALL_PROTOCOLS (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK |\
48 NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK |\
49 NFC_PROTO_NFC_DEP_MASK |\
50 NFC_PROTO_ISO14443_B_MASK)
51
52 #define PN533_NO_TYPE_B_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
53 NFC_PROTO_MIFARE_MASK | \
54 NFC_PROTO_FELICA_MASK | \
55 NFC_PROTO_ISO14443_MASK | \
56 NFC_PROTO_NFC_DEP_MASK)
57
58 static const struct usb_device_id pn533_table[] = {
59 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE,
60 .idVendor = PN533_VENDOR_ID,
61 .idProduct = PN533_PRODUCT_ID,
62 .driver_info = PN533_DEVICE_STD,
63 },
64 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE,
65 .idVendor = SCM_VENDOR_ID,
66 .idProduct = SCL3711_PRODUCT_ID,
67 .driver_info = PN533_DEVICE_STD,
68 },
69 { .match_flags = USB_DEVICE_ID_MATCH_DEVICE,
70 .idVendor = SONY_VENDOR_ID,
71 .idProduct = PASORI_PRODUCT_ID,
72 .driver_info = PN533_DEVICE_PASORI,
73 },
74 { }
75 };
76 MODULE_DEVICE_TABLE(usb, pn533_table);
77
78 /* How much time we spend listening for initiators */
79 #define PN533_LISTEN_TIME 2
80
81 /* frame definitions */
82 #define PN533_NORMAL_FRAME_MAX_LEN 262 /* 6 (PREAMBLE, SOF, LEN, LCS, TFI)
83 254 (DATA)
84 2 (DCS, postamble) */
85 #define PN533_FRAME_HEADER_LEN (sizeof(struct pn533_frame) \
86 + 2) /* data[0] TFI, data[1] CC */
87 #define PN533_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
88
89 /*
90 * Max extended frame payload len, excluding TFI and CC
91 * which are already in PN533_FRAME_HEADER_LEN.
92 */
93 #define PN533_FRAME_MAX_PAYLOAD_LEN 263
94
95 #define PN533_FRAME_SIZE(f) (sizeof(struct pn533_frame) + f->datalen + \
96 PN533_FRAME_TAIL_LEN)
97 #define PN533_FRAME_ACK_SIZE (sizeof(struct pn533_frame) + 1)
98 #define PN533_FRAME_CHECKSUM(f) (f->data[f->datalen])
99 #define PN533_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])
100
101 /* start of frame */
102 #define PN533_SOF 0x00FF
103
104 /* frame identifier: in/out/error */
105 #define PN533_FRAME_IDENTIFIER(f) (f->data[0])
106 #define PN533_DIR_OUT 0xD4
107 #define PN533_DIR_IN 0xD5
108
109 /* PN533 Commands */
110 #define PN533_FRAME_CMD(f) (f->data[1])
111 #define PN533_FRAME_CMD_PARAMS_PTR(f) (&f->data[2])
112 #define PN533_FRAME_CMD_PARAMS_LEN(f) (f->datalen - 2)
113
114 #define PN533_CMD_GET_FIRMWARE_VERSION 0x02
115 #define PN533_CMD_RF_CONFIGURATION 0x32
116 #define PN533_CMD_IN_DATA_EXCHANGE 0x40
117 #define PN533_CMD_IN_COMM_THRU 0x42
118 #define PN533_CMD_IN_LIST_PASSIVE_TARGET 0x4A
119 #define PN533_CMD_IN_ATR 0x50
120 #define PN533_CMD_IN_RELEASE 0x52
121 #define PN533_CMD_IN_JUMP_FOR_DEP 0x56
122
123 #define PN533_CMD_TG_INIT_AS_TARGET 0x8c
124 #define PN533_CMD_TG_GET_DATA 0x86
125 #define PN533_CMD_TG_SET_DATA 0x8e
126 #define PN533_CMD_UNDEF 0xff
127
128 #define PN533_CMD_RESPONSE(cmd) (cmd + 1)
129
130 /* PN533 Return codes */
131 #define PN533_CMD_RET_MASK 0x3F
132 #define PN533_CMD_MI_MASK 0x40
133 #define PN533_CMD_RET_SUCCESS 0x00
134
135 struct pn533;
136
137 typedef int (*pn533_cmd_complete_t) (struct pn533 *dev, void *arg,
138 u8 *params, int params_len);
139
140 typedef int (*pn533_send_async_complete_t) (struct pn533 *dev, void *arg,
141 struct sk_buff *resp);
142
143 /* structs for pn533 commands */
144
145 /* PN533_CMD_GET_FIRMWARE_VERSION */
146 struct pn533_fw_version {
147 u8 ic;
148 u8 ver;
149 u8 rev;
150 u8 support;
151 };
152
153 /* PN533_CMD_RF_CONFIGURATION */
154 #define PN533_CFGITEM_TIMING 0x02
155 #define PN533_CFGITEM_MAX_RETRIES 0x05
156 #define PN533_CFGITEM_PASORI 0x82
157
158 #define PN533_CONFIG_TIMING_102 0xb
159 #define PN533_CONFIG_TIMING_204 0xc
160 #define PN533_CONFIG_TIMING_409 0xd
161 #define PN533_CONFIG_TIMING_819 0xe
162
163 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
164 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
165
166 struct pn533_config_max_retries {
167 u8 mx_rty_atr;
168 u8 mx_rty_psl;
169 u8 mx_rty_passive_act;
170 } __packed;
171
172 struct pn533_config_timing {
173 u8 rfu;
174 u8 atr_res_timeout;
175 u8 dep_timeout;
176 } __packed;
177
178 /* PN533_CMD_IN_LIST_PASSIVE_TARGET */
179
180 /* felica commands opcode */
181 #define PN533_FELICA_OPC_SENSF_REQ 0
182 #define PN533_FELICA_OPC_SENSF_RES 1
183 /* felica SENSF_REQ parameters */
184 #define PN533_FELICA_SENSF_SC_ALL 0xFFFF
185 #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
186 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
187 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
188
189 /* type B initiator_data values */
190 #define PN533_TYPE_B_AFI_ALL_FAMILIES 0
191 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
192 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
193
194 union pn533_cmd_poll_initdata {
195 struct {
196 u8 afi;
197 u8 polling_method;
198 } __packed type_b;
199 struct {
200 u8 opcode;
201 __be16 sc;
202 u8 rc;
203 u8 tsn;
204 } __packed felica;
205 };
206
207 /* Poll modulations */
208 enum {
209 PN533_POLL_MOD_106KBPS_A,
210 PN533_POLL_MOD_212KBPS_FELICA,
211 PN533_POLL_MOD_424KBPS_FELICA,
212 PN533_POLL_MOD_106KBPS_JEWEL,
213 PN533_POLL_MOD_847KBPS_B,
214 PN533_LISTEN_MOD,
215
216 __PN533_POLL_MOD_AFTER_LAST,
217 };
218 #define PN533_POLL_MOD_MAX (__PN533_POLL_MOD_AFTER_LAST - 1)
219
220 struct pn533_poll_modulations {
221 struct {
222 u8 maxtg;
223 u8 brty;
224 union pn533_cmd_poll_initdata initiator_data;
225 } __packed data;
226 u8 len;
227 };
228
229 const struct pn533_poll_modulations poll_mod[] = {
230 [PN533_POLL_MOD_106KBPS_A] = {
231 .data = {
232 .maxtg = 1,
233 .brty = 0,
234 },
235 .len = 2,
236 },
237 [PN533_POLL_MOD_212KBPS_FELICA] = {
238 .data = {
239 .maxtg = 1,
240 .brty = 1,
241 .initiator_data.felica = {
242 .opcode = PN533_FELICA_OPC_SENSF_REQ,
243 .sc = PN533_FELICA_SENSF_SC_ALL,
244 .rc = PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE,
245 .tsn = 0,
246 },
247 },
248 .len = 7,
249 },
250 [PN533_POLL_MOD_424KBPS_FELICA] = {
251 .data = {
252 .maxtg = 1,
253 .brty = 2,
254 .initiator_data.felica = {
255 .opcode = PN533_FELICA_OPC_SENSF_REQ,
256 .sc = PN533_FELICA_SENSF_SC_ALL,
257 .rc = PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE,
258 .tsn = 0,
259 },
260 },
261 .len = 7,
262 },
263 [PN533_POLL_MOD_106KBPS_JEWEL] = {
264 .data = {
265 .maxtg = 1,
266 .brty = 4,
267 },
268 .len = 2,
269 },
270 [PN533_POLL_MOD_847KBPS_B] = {
271 .data = {
272 .maxtg = 1,
273 .brty = 8,
274 .initiator_data.type_b = {
275 .afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
276 .polling_method =
277 PN533_TYPE_B_POLL_METHOD_TIMESLOT,
278 },
279 },
280 .len = 3,
281 },
282 [PN533_LISTEN_MOD] = {
283 .len = 0,
284 },
285 };
286
287 /* PN533_CMD_IN_ATR */
288
289 struct pn533_cmd_activate_response {
290 u8 status;
291 u8 nfcid3t[10];
292 u8 didt;
293 u8 bst;
294 u8 brt;
295 u8 to;
296 u8 ppt;
297 /* optional */
298 u8 gt[];
299 } __packed;
300
301 struct pn533_cmd_jump_dep_response {
302 u8 status;
303 u8 tg;
304 u8 nfcid3t[10];
305 u8 didt;
306 u8 bst;
307 u8 brt;
308 u8 to;
309 u8 ppt;
310 /* optional */
311 u8 gt[];
312 } __packed;
313
314
315 /* PN533_TG_INIT_AS_TARGET */
316 #define PN533_INIT_TARGET_PASSIVE 0x1
317 #define PN533_INIT_TARGET_DEP 0x2
318
319 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
320 #define PN533_INIT_TARGET_RESP_ACTIVE 0x1
321 #define PN533_INIT_TARGET_RESP_DEP 0x4
322
323 struct pn533 {
324 struct usb_device *udev;
325 struct usb_interface *interface;
326 struct nfc_dev *nfc_dev;
327
328 struct urb *out_urb;
329 struct pn533_frame *out_frame;
330
331 struct urb *in_urb;
332
333 struct sk_buff_head resp_q;
334
335 struct workqueue_struct *wq;
336 struct work_struct cmd_work;
337 struct work_struct cmd_complete_work;
338 struct work_struct poll_work;
339 struct work_struct mi_work;
340 struct work_struct tg_work;
341 struct timer_list listen_timer;
342 struct pn533_frame *wq_in_frame;
343 int wq_in_error;
344 int cancel_listen;
345
346 pn533_cmd_complete_t cmd_complete;
347 void *cmd_complete_arg;
348 void *cmd_complete_mi_arg;
349 struct mutex cmd_lock;
350 u8 cmd;
351
352 struct pn533_poll_modulations *poll_mod_active[PN533_POLL_MOD_MAX + 1];
353 u8 poll_mod_count;
354 u8 poll_mod_curr;
355 u32 poll_protocols;
356 u32 listen_protocols;
357
358 u8 *gb;
359 size_t gb_len;
360
361 u8 tgt_available_prots;
362 u8 tgt_active_prot;
363 u8 tgt_mode;
364
365 u32 device_type;
366
367 struct list_head cmd_queue;
368 u8 cmd_pending;
369 };
370
371 struct pn533_cmd {
372 struct list_head queue;
373 u8 cmd_code;
374 struct sk_buff *req;
375 struct sk_buff *resp;
376 void *arg;
377 };
378
379 struct pn533_frame {
380 u8 preamble;
381 __be16 start_frame;
382 u8 datalen;
383 u8 datalen_checksum;
384 u8 data[];
385 } __packed;
386
387 /* The rule: value + checksum = 0 */
388 static inline u8 pn533_checksum(u8 value)
389 {
390 return ~value + 1;
391 }
392
393 /* The rule: sum(data elements) + checksum = 0 */
394 static u8 pn533_data_checksum(u8 *data, int datalen)
395 {
396 u8 sum = 0;
397 int i;
398
399 for (i = 0; i < datalen; i++)
400 sum += data[i];
401
402 return pn533_checksum(sum);
403 }
404
405 /**
406 * pn533_tx_frame_ack - create a ack frame
407 * @frame: The frame to be set as ack
408 *
409 * Ack is different type of standard frame. As a standard frame, it has
410 * preamble and start_frame. However the checksum of this frame must fail,
411 * i.e. datalen + datalen_checksum must NOT be zero. When the checksum test
412 * fails and datalen = 0 and datalen_checksum = 0xFF, the frame is a ack.
413 * After datalen_checksum field, the postamble is placed.
414 */
415 static void pn533_tx_frame_ack(struct pn533_frame *frame)
416 {
417 frame->preamble = 0;
418 frame->start_frame = cpu_to_be16(PN533_SOF);
419 frame->datalen = 0;
420 frame->datalen_checksum = 0xFF;
421 /* data[0] is used as postamble */
422 frame->data[0] = 0;
423 }
424
425 static void pn533_tx_frame_init(struct pn533_frame *frame, u8 cmd)
426 {
427 frame->preamble = 0;
428 frame->start_frame = cpu_to_be16(PN533_SOF);
429 PN533_FRAME_IDENTIFIER(frame) = PN533_DIR_OUT;
430 PN533_FRAME_CMD(frame) = cmd;
431 frame->datalen = 2;
432 }
433
434 static void pn533_tx_frame_finish(struct pn533_frame *frame)
435 {
436 frame->datalen_checksum = pn533_checksum(frame->datalen);
437
438 PN533_FRAME_CHECKSUM(frame) =
439 pn533_data_checksum(frame->data, frame->datalen);
440
441 PN533_FRAME_POSTAMBLE(frame) = 0;
442 }
443
444 static bool pn533_rx_frame_is_valid(struct pn533_frame *frame)
445 {
446 u8 checksum;
447
448 if (frame->start_frame != cpu_to_be16(PN533_SOF))
449 return false;
450
451 checksum = pn533_checksum(frame->datalen);
452 if (checksum != frame->datalen_checksum)
453 return false;
454
455 checksum = pn533_data_checksum(frame->data, frame->datalen);
456 if (checksum != PN533_FRAME_CHECKSUM(frame))
457 return false;
458
459 return true;
460 }
461
462 static bool pn533_rx_frame_is_ack(struct pn533_frame *frame)
463 {
464 if (frame->start_frame != cpu_to_be16(PN533_SOF))
465 return false;
466
467 if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
468 return false;
469
470 return true;
471 }
472
473 static bool pn533_rx_frame_is_cmd_response(struct pn533_frame *frame, u8 cmd)
474 {
475 return (PN533_FRAME_CMD(frame) == PN533_CMD_RESPONSE(cmd));
476 }
477
478
479 static void pn533_wq_cmd_complete(struct work_struct *work)
480 {
481 struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
482 struct pn533_frame *in_frame;
483 int rc;
484
485 in_frame = dev->wq_in_frame;
486
487 if (dev->wq_in_error)
488 rc = dev->cmd_complete(dev, dev->cmd_complete_arg, NULL,
489 dev->wq_in_error);
490 else
491 rc = dev->cmd_complete(dev, dev->cmd_complete_arg,
492 PN533_FRAME_CMD_PARAMS_PTR(in_frame),
493 PN533_FRAME_CMD_PARAMS_LEN(in_frame));
494
495 if (rc != -EINPROGRESS)
496 queue_work(dev->wq, &dev->cmd_work);
497 }
498
499 static void pn533_recv_response(struct urb *urb)
500 {
501 struct pn533 *dev = urb->context;
502 struct pn533_frame *in_frame;
503
504 dev->wq_in_frame = NULL;
505
506 switch (urb->status) {
507 case 0:
508 break; /* success */
509 case -ECONNRESET:
510 case -ENOENT:
511 nfc_dev_dbg(&dev->interface->dev,
512 "The urb has been canceled (status %d)",
513 urb->status);
514 dev->wq_in_error = urb->status;
515 goto sched_wq;
516 break;
517 case -ESHUTDOWN:
518 default:
519 nfc_dev_err(&dev->interface->dev,
520 "Urb failure (status %d)", urb->status);
521 dev->wq_in_error = urb->status;
522 goto sched_wq;
523 }
524
525 in_frame = dev->in_urb->transfer_buffer;
526
527 print_hex_dump(KERN_DEBUG, "PN533 RX: ", DUMP_PREFIX_NONE, 16, 1,
528 in_frame, PN533_FRAME_SIZE(in_frame), false);
529
530 if (!pn533_rx_frame_is_valid(in_frame)) {
531 nfc_dev_err(&dev->interface->dev, "Received an invalid frame");
532 dev->wq_in_error = -EIO;
533 goto sched_wq;
534 }
535
536 if (!pn533_rx_frame_is_cmd_response(in_frame, dev->cmd)) {
537 nfc_dev_err(&dev->interface->dev,
538 "It it not the response to the last command");
539 dev->wq_in_error = -EIO;
540 goto sched_wq;
541 }
542
543 nfc_dev_dbg(&dev->interface->dev, "Received a valid frame");
544 dev->wq_in_error = 0;
545 dev->wq_in_frame = in_frame;
546
547 sched_wq:
548 queue_work(dev->wq, &dev->cmd_complete_work);
549 }
550
551 static int pn533_submit_urb_for_response(struct pn533 *dev, gfp_t flags)
552 {
553 dev->in_urb->complete = pn533_recv_response;
554
555 return usb_submit_urb(dev->in_urb, flags);
556 }
557
558 static void pn533_recv_ack(struct urb *urb)
559 {
560 struct pn533 *dev = urb->context;
561 struct pn533_frame *in_frame;
562 int rc;
563
564 switch (urb->status) {
565 case 0:
566 break; /* success */
567 case -ECONNRESET:
568 case -ENOENT:
569 nfc_dev_dbg(&dev->interface->dev,
570 "The urb has been stopped (status %d)",
571 urb->status);
572 dev->wq_in_error = urb->status;
573 goto sched_wq;
574 break;
575 case -ESHUTDOWN:
576 default:
577 nfc_dev_err(&dev->interface->dev,
578 "Urb failure (status %d)", urb->status);
579 dev->wq_in_error = urb->status;
580 goto sched_wq;
581 }
582
583 in_frame = dev->in_urb->transfer_buffer;
584
585 if (!pn533_rx_frame_is_ack(in_frame)) {
586 nfc_dev_err(&dev->interface->dev, "Received an invalid ack");
587 dev->wq_in_error = -EIO;
588 goto sched_wq;
589 }
590
591 nfc_dev_dbg(&dev->interface->dev, "Received a valid ack");
592
593 rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
594 if (rc) {
595 nfc_dev_err(&dev->interface->dev,
596 "usb_submit_urb failed with result %d", rc);
597 dev->wq_in_error = rc;
598 goto sched_wq;
599 }
600
601 return;
602
603 sched_wq:
604 dev->wq_in_frame = NULL;
605 queue_work(dev->wq, &dev->cmd_complete_work);
606 }
607
608 static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags)
609 {
610 dev->in_urb->complete = pn533_recv_ack;
611
612 return usb_submit_urb(dev->in_urb, flags);
613 }
614
615 static int pn533_send_ack(struct pn533 *dev, gfp_t flags)
616 {
617 int rc;
618
619 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
620
621 pn533_tx_frame_ack(dev->out_frame);
622
623 dev->out_urb->transfer_buffer = dev->out_frame;
624 dev->out_urb->transfer_buffer_length = PN533_FRAME_ACK_SIZE;
625 rc = usb_submit_urb(dev->out_urb, flags);
626
627 return rc;
628 }
629
630 static int __pn533_send_cmd_frame_async(struct pn533 *dev,
631 struct pn533_frame *out_frame,
632 struct pn533_frame *in_frame,
633 int in_frame_len,
634 pn533_cmd_complete_t cmd_complete,
635 void *arg)
636 {
637 int rc;
638
639 nfc_dev_dbg(&dev->interface->dev, "Sending command 0x%x",
640 PN533_FRAME_CMD(out_frame));
641
642 dev->cmd = PN533_FRAME_CMD(out_frame);
643 dev->cmd_complete = cmd_complete;
644 dev->cmd_complete_arg = arg;
645
646 dev->out_urb->transfer_buffer = out_frame;
647 dev->out_urb->transfer_buffer_length =
648 PN533_FRAME_SIZE(out_frame);
649
650 dev->in_urb->transfer_buffer = in_frame;
651 dev->in_urb->transfer_buffer_length = in_frame_len;
652
653 print_hex_dump(KERN_DEBUG, "PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
654 out_frame, PN533_FRAME_SIZE(out_frame), false);
655
656 rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
657 if (rc)
658 return rc;
659
660 rc = pn533_submit_urb_for_ack(dev, GFP_KERNEL);
661 if (rc)
662 goto error;
663
664 return 0;
665
666 error:
667 usb_unlink_urb(dev->out_urb);
668 return rc;
669 }
670
671 static void pn533_build_cmd_frame(u8 cmd_code, struct sk_buff *skb)
672 {
673 struct pn533_frame *frame;
674 /* payload is already there, just update datalen */
675 int payload_len = skb->len;
676
677 skb_push(skb, PN533_FRAME_HEADER_LEN);
678 skb_put(skb, PN533_FRAME_TAIL_LEN);
679
680 frame = (struct pn533_frame *)skb->data;
681
682 pn533_tx_frame_init(frame, cmd_code);
683 frame->datalen += payload_len;
684 pn533_tx_frame_finish(frame);
685 }
686
687 struct pn533_send_async_complete_arg {
688 pn533_send_async_complete_t complete_cb;
689 void *complete_cb_context;
690 struct sk_buff *resp;
691 struct sk_buff *req;
692 };
693
694 static int pn533_send_async_complete(struct pn533 *dev, void *_arg, u8 *params,
695 int params_len)
696 {
697 struct pn533_send_async_complete_arg *arg = _arg;
698
699 struct sk_buff *req = arg->req;
700 struct sk_buff *resp = arg->resp;
701
702 struct pn533_frame *frame = (struct pn533_frame *)resp->data;
703 int rc;
704
705 dev_kfree_skb(req);
706
707 if (params_len < 0) {
708 nfc_dev_err(&dev->interface->dev,
709 "Error %d when starting as a target",
710 params_len);
711
712 arg->complete_cb(dev, arg->complete_cb_context,
713 ERR_PTR(params_len));
714 rc = params_len;
715 dev_kfree_skb(resp);
716 goto out;
717 }
718
719 skb_put(resp, PN533_FRAME_SIZE(frame));
720 skb_pull(resp, PN533_FRAME_HEADER_LEN);
721 skb_trim(resp, resp->len - PN533_FRAME_TAIL_LEN);
722
723 rc = arg->complete_cb(dev, arg->complete_cb_context, resp);
724
725 out:
726 kfree(arg);
727 return rc;
728 }
729
730 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
731 struct sk_buff *req, struct sk_buff *resp,
732 int resp_len,
733 pn533_send_async_complete_t complete_cb,
734 void *complete_cb_context)
735 {
736 struct pn533_cmd *cmd;
737 struct pn533_send_async_complete_arg *arg;
738 int rc = 0;
739
740 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
741
742 arg = kzalloc(sizeof(arg), GFP_KERNEL);
743 if (!arg)
744 return -ENOMEM;
745
746 arg->complete_cb = complete_cb;
747 arg->complete_cb_context = complete_cb_context;
748 arg->resp = resp;
749 arg->req = req;
750
751 pn533_build_cmd_frame(cmd_code, req);
752
753 mutex_lock(&dev->cmd_lock);
754
755 if (!dev->cmd_pending) {
756 rc = __pn533_send_cmd_frame_async(dev,
757 (struct pn533_frame *)req->data,
758 (struct pn533_frame *)resp->data,
759 resp_len, pn533_send_async_complete,
760 arg);
761 if (rc)
762 goto error;
763
764 dev->cmd_pending = 1;
765 goto unlock;
766 }
767
768 nfc_dev_dbg(&dev->interface->dev, "%s Queueing command", __func__);
769
770 cmd = kzalloc(sizeof(struct pn533_cmd), GFP_KERNEL);
771 if (!cmd) {
772 rc = -ENOMEM;
773 goto error;
774 }
775
776 INIT_LIST_HEAD(&cmd->queue);
777 cmd->cmd_code = cmd_code;
778 cmd->req = req;
779 cmd->resp = resp;
780 cmd->arg = arg;
781
782 list_add_tail(&cmd->queue, &dev->cmd_queue);
783
784 goto unlock;
785
786 error:
787 kfree(arg);
788 unlock:
789 mutex_unlock(&dev->cmd_lock);
790 return rc;
791 }
792
793 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
794 struct sk_buff *req,
795 pn533_send_async_complete_t complete_cb,
796 void *complete_cb_context)
797 {
798 struct sk_buff *resp;
799 int rc;
800 int resp_len = PN533_FRAME_HEADER_LEN +
801 PN533_FRAME_MAX_PAYLOAD_LEN +
802 PN533_FRAME_TAIL_LEN;
803
804 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
805
806 resp = nfc_alloc_recv_skb(resp_len, GFP_KERNEL);
807 if (!resp)
808 return -ENOMEM;
809
810 rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
811 complete_cb_context);
812 if (rc)
813 dev_kfree_skb(resp);
814
815 return rc;
816 }
817
818 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
819 struct sk_buff *req,
820 pn533_send_async_complete_t complete_cb,
821 void *complete_cb_context)
822 {
823 struct sk_buff *resp;
824 int rc;
825
826 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
827
828 resp = alloc_skb(PN533_NORMAL_FRAME_MAX_LEN, GFP_KERNEL);
829 if (!resp)
830 return -ENOMEM;
831
832 rc = __pn533_send_async(dev, cmd_code, req, resp,
833 PN533_NORMAL_FRAME_MAX_LEN,
834 complete_cb, complete_cb_context);
835 if (rc)
836 dev_kfree_skb(resp);
837
838 return rc;
839 }
840
841 /*
842 * pn533_send_cmd_direct_async
843 *
844 * The function sends a piority cmd directly to the chip omiting the cmd
845 * queue. It's intended to be used by chaining mechanism of received responses
846 * where the host has to request every single chunk of data before scheduling
847 * next cmd from the queue.
848 */
849 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
850 struct sk_buff *req,
851 pn533_send_async_complete_t complete_cb,
852 void *complete_cb_context)
853 {
854 struct pn533_send_async_complete_arg *arg;
855 struct sk_buff *resp;
856 int rc;
857 int resp_len = PN533_FRAME_HEADER_LEN +
858 PN533_FRAME_MAX_PAYLOAD_LEN +
859 PN533_FRAME_TAIL_LEN;
860
861 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
862
863 resp = alloc_skb(resp_len, GFP_KERNEL);
864 if (!resp)
865 return -ENOMEM;
866
867 arg = kzalloc(sizeof(arg), GFP_KERNEL);
868 if (!arg) {
869 dev_kfree_skb(resp);
870 return -ENOMEM;
871 }
872
873 arg->complete_cb = complete_cb;
874 arg->complete_cb_context = complete_cb_context;
875 arg->resp = resp;
876 arg->req = req;
877
878 pn533_build_cmd_frame(cmd_code, req);
879
880 rc = __pn533_send_cmd_frame_async(dev, (struct pn533_frame *)req->data,
881 (struct pn533_frame *)resp->data,
882 resp_len, pn533_send_async_complete,
883 arg);
884 if (rc < 0) {
885 dev_kfree_skb(resp);
886 kfree(arg);
887 }
888
889 return rc;
890 }
891
892 static void pn533_wq_cmd(struct work_struct *work)
893 {
894 struct pn533 *dev = container_of(work, struct pn533, cmd_work);
895 struct pn533_cmd *cmd;
896
897 mutex_lock(&dev->cmd_lock);
898
899 if (list_empty(&dev->cmd_queue)) {
900 dev->cmd_pending = 0;
901 mutex_unlock(&dev->cmd_lock);
902 return;
903 }
904
905 cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
906
907 list_del(&cmd->queue);
908
909 mutex_unlock(&dev->cmd_lock);
910
911 __pn533_send_cmd_frame_async(dev,
912 (struct pn533_frame *)cmd->req->data,
913 (struct pn533_frame *)cmd->resp->data,
914 PN533_NORMAL_FRAME_MAX_LEN,
915 pn533_send_async_complete,
916 cmd->arg);
917
918 kfree(cmd);
919 }
920
921 struct pn533_sync_cmd_response {
922 struct sk_buff *resp;
923 struct completion done;
924 };
925
926 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
927 struct sk_buff *resp)
928 {
929 struct pn533_sync_cmd_response *arg = _arg;
930
931 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
932
933 arg->resp = resp;
934 complete(&arg->done);
935
936 return 0;
937 }
938
939 /* pn533_send_cmd_sync
940 *
941 * Please note the req parameter is freed inside the function to
942 * limit a number of return value interpretations by the caller.
943 *
944 * 1. negative in case of error during TX path -> req should be freed
945 *
946 * 2. negative in case of error during RX path -> req should not be freed
947 * as it's been already freed at the begining of RX path by
948 * async_complete_cb.
949 *
950 * 3. valid pointer in case of succesfult RX path
951 *
952 * A caller has to check a return value with IS_ERR macro. If the test pass,
953 * the returned pointer is valid.
954 *
955 * */
956 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
957 struct sk_buff *req)
958 {
959 int rc;
960 struct pn533_sync_cmd_response arg;
961
962 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
963
964 init_completion(&arg.done);
965
966 rc = pn533_send_cmd_async(dev, cmd_code, req,
967 pn533_send_sync_complete, &arg);
968 if (rc) {
969 dev_kfree_skb(req);
970 return ERR_PTR(rc);
971 }
972
973 wait_for_completion(&arg.done);
974
975 return arg.resp;
976 }
977
978 static void pn533_send_complete(struct urb *urb)
979 {
980 struct pn533 *dev = urb->context;
981
982 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
983
984 switch (urb->status) {
985 case 0:
986 break; /* success */
987 case -ECONNRESET:
988 case -ENOENT:
989 nfc_dev_dbg(&dev->interface->dev,
990 "The urb has been stopped (status %d)",
991 urb->status);
992 break;
993 case -ESHUTDOWN:
994 default:
995 nfc_dev_err(&dev->interface->dev,
996 "Urb failure (status %d)", urb->status);
997 }
998 }
999
1000 static struct sk_buff *pn533_alloc_skb(unsigned int size)
1001 {
1002 struct sk_buff *skb;
1003
1004 skb = alloc_skb(PN533_FRAME_HEADER_LEN +
1005 size +
1006 PN533_FRAME_TAIL_LEN, GFP_KERNEL);
1007
1008 if (skb)
1009 skb_reserve(skb, PN533_FRAME_HEADER_LEN);
1010
1011 return skb;
1012 }
1013
1014 struct pn533_target_type_a {
1015 __be16 sens_res;
1016 u8 sel_res;
1017 u8 nfcid_len;
1018 u8 nfcid_data[];
1019 } __packed;
1020
1021
1022 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
1023 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
1024 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
1025
1026 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
1027 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
1028
1029 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
1030 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
1031
1032 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
1033 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
1034 #define PN533_TYPE_A_SEL_PROT_DEP 2
1035 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
1036
1037 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
1038 int target_data_len)
1039 {
1040 u8 ssd;
1041 u8 platconf;
1042
1043 if (target_data_len < sizeof(struct pn533_target_type_a))
1044 return false;
1045
1046 /* The lenght check of nfcid[] and ats[] are not being performed because
1047 the values are not being used */
1048
1049 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1050 ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
1051 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
1052
1053 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1054 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1055 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1056 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1057 return false;
1058
1059 /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
1060 if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
1061 return false;
1062
1063 return true;
1064 }
1065
1066 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
1067 int tgt_data_len)
1068 {
1069 struct pn533_target_type_a *tgt_type_a;
1070
1071 tgt_type_a = (struct pn533_target_type_a *)tgt_data;
1072
1073 if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
1074 return -EPROTO;
1075
1076 switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
1077 case PN533_TYPE_A_SEL_PROT_MIFARE:
1078 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
1079 break;
1080 case PN533_TYPE_A_SEL_PROT_ISO14443:
1081 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
1082 break;
1083 case PN533_TYPE_A_SEL_PROT_DEP:
1084 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1085 break;
1086 case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
1087 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
1088 NFC_PROTO_NFC_DEP_MASK;
1089 break;
1090 }
1091
1092 nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
1093 nfc_tgt->sel_res = tgt_type_a->sel_res;
1094 nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
1095 memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
1096
1097 return 0;
1098 }
1099
1100 struct pn533_target_felica {
1101 u8 pol_res;
1102 u8 opcode;
1103 u8 nfcid2[8];
1104 u8 pad[8];
1105 /* optional */
1106 u8 syst_code[];
1107 } __packed;
1108
1109 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
1110 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
1111
1112 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
1113 int target_data_len)
1114 {
1115 if (target_data_len < sizeof(struct pn533_target_felica))
1116 return false;
1117
1118 if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
1119 return false;
1120
1121 return true;
1122 }
1123
1124 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
1125 int tgt_data_len)
1126 {
1127 struct pn533_target_felica *tgt_felica;
1128
1129 tgt_felica = (struct pn533_target_felica *)tgt_data;
1130
1131 if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
1132 return -EPROTO;
1133
1134 if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
1135 (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
1136 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1137 else
1138 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
1139
1140 memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
1141 nfc_tgt->sensf_res_len = 9;
1142
1143 return 0;
1144 }
1145
1146 struct pn533_target_jewel {
1147 __be16 sens_res;
1148 u8 jewelid[4];
1149 } __packed;
1150
1151 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
1152 int target_data_len)
1153 {
1154 u8 ssd;
1155 u8 platconf;
1156
1157 if (target_data_len < sizeof(struct pn533_target_jewel))
1158 return false;
1159
1160 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1161 ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
1162 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
1163
1164 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1165 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1166 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1167 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1168 return false;
1169
1170 return true;
1171 }
1172
1173 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
1174 int tgt_data_len)
1175 {
1176 struct pn533_target_jewel *tgt_jewel;
1177
1178 tgt_jewel = (struct pn533_target_jewel *)tgt_data;
1179
1180 if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
1181 return -EPROTO;
1182
1183 nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
1184 nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
1185 nfc_tgt->nfcid1_len = 4;
1186 memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
1187
1188 return 0;
1189 }
1190
1191 struct pn533_type_b_prot_info {
1192 u8 bitrate;
1193 u8 fsci_type;
1194 u8 fwi_adc_fo;
1195 } __packed;
1196
1197 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
1198 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
1199 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
1200
1201 struct pn533_type_b_sens_res {
1202 u8 opcode;
1203 u8 nfcid[4];
1204 u8 appdata[4];
1205 struct pn533_type_b_prot_info prot_info;
1206 } __packed;
1207
1208 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
1209
1210 struct pn533_target_type_b {
1211 struct pn533_type_b_sens_res sensb_res;
1212 u8 attrib_res_len;
1213 u8 attrib_res[];
1214 } __packed;
1215
1216 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
1217 int target_data_len)
1218 {
1219 if (target_data_len < sizeof(struct pn533_target_type_b))
1220 return false;
1221
1222 if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
1223 return false;
1224
1225 if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
1226 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
1227 return false;
1228
1229 return true;
1230 }
1231
1232 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
1233 int tgt_data_len)
1234 {
1235 struct pn533_target_type_b *tgt_type_b;
1236
1237 tgt_type_b = (struct pn533_target_type_b *)tgt_data;
1238
1239 if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
1240 return -EPROTO;
1241
1242 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
1243
1244 return 0;
1245 }
1246
1247 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
1248 int tgdata_len)
1249 {
1250 struct nfc_target nfc_tgt;
1251 int rc;
1252
1253 nfc_dev_dbg(&dev->interface->dev, "%s - modulation=%d", __func__,
1254 dev->poll_mod_curr);
1255
1256 if (tg != 1)
1257 return -EPROTO;
1258
1259 memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1260
1261 switch (dev->poll_mod_curr) {
1262 case PN533_POLL_MOD_106KBPS_A:
1263 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
1264 break;
1265 case PN533_POLL_MOD_212KBPS_FELICA:
1266 case PN533_POLL_MOD_424KBPS_FELICA:
1267 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
1268 break;
1269 case PN533_POLL_MOD_106KBPS_JEWEL:
1270 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
1271 break;
1272 case PN533_POLL_MOD_847KBPS_B:
1273 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
1274 break;
1275 default:
1276 nfc_dev_err(&dev->interface->dev,
1277 "Unknown current poll modulation");
1278 return -EPROTO;
1279 }
1280
1281 if (rc)
1282 return rc;
1283
1284 if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1285 nfc_dev_dbg(&dev->interface->dev,
1286 "The Tg found doesn't have the desired protocol");
1287 return -EAGAIN;
1288 }
1289
1290 nfc_dev_dbg(&dev->interface->dev,
1291 "Target found - supported protocols: 0x%x",
1292 nfc_tgt.supported_protocols);
1293
1294 dev->tgt_available_prots = nfc_tgt.supported_protocols;
1295
1296 nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1297
1298 return 0;
1299 }
1300
1301 static inline void pn533_poll_next_mod(struct pn533 *dev)
1302 {
1303 dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
1304 }
1305
1306 static void pn533_poll_reset_mod_list(struct pn533 *dev)
1307 {
1308 dev->poll_mod_count = 0;
1309 }
1310
1311 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
1312 {
1313 dev->poll_mod_active[dev->poll_mod_count] =
1314 (struct pn533_poll_modulations *)&poll_mod[mod_index];
1315 dev->poll_mod_count++;
1316 }
1317
1318 static void pn533_poll_create_mod_list(struct pn533 *dev,
1319 u32 im_protocols, u32 tm_protocols)
1320 {
1321 pn533_poll_reset_mod_list(dev);
1322
1323 if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
1324 (im_protocols & NFC_PROTO_ISO14443_MASK) ||
1325 (im_protocols & NFC_PROTO_NFC_DEP_MASK))
1326 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
1327
1328 if (im_protocols & NFC_PROTO_FELICA_MASK ||
1329 im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1330 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
1331 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
1332 }
1333
1334 if (im_protocols & NFC_PROTO_JEWEL_MASK)
1335 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
1336
1337 if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1338 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
1339
1340 if (tm_protocols)
1341 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
1342 }
1343
1344 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
1345 {
1346 u8 nbtg, tg, *tgdata;
1347 int rc, tgdata_len;
1348
1349 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1350
1351 nbtg = resp->data[0];
1352 tg = resp->data[1];
1353 tgdata = &resp->data[2];
1354 tgdata_len = resp->len - 2; /* nbtg + tg */
1355
1356 if (nbtg) {
1357 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1358
1359 /* We must stop the poll after a valid target found */
1360 if (rc == 0) {
1361 pn533_poll_reset_mod_list(dev);
1362 return 0;
1363 }
1364 }
1365
1366 return -EAGAIN;
1367 }
1368
1369 static struct sk_buff *pn533_alloc_poll_tg_frame(u8 *gbytes, size_t gbytes_len)
1370 {
1371 struct sk_buff *skb;
1372 u8 *felica, *nfcid3, *gb;
1373
1374 u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1375 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1376 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1377 0xff, 0xff}; /* System code */
1378
1379 u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1380 0x0, 0x0, 0x0,
1381 0x40}; /* SEL_RES for DEP */
1382
1383 unsigned int skb_len = 36 + /* mode (1), mifare (6),
1384 felica (18), nfcid3 (10), gb_len (1) */
1385 gbytes_len +
1386 1; /* len Tk*/
1387
1388 skb = pn533_alloc_skb(skb_len);
1389 if (!skb)
1390 return NULL;
1391
1392 /* DEP support only */
1393 *skb_put(skb, 1) |= PN533_INIT_TARGET_DEP;
1394
1395 /* MIFARE params */
1396 memcpy(skb_put(skb, 6), mifare_params, 6);
1397
1398 /* Felica params */
1399 felica = skb_put(skb, 18);
1400 memcpy(felica, felica_params, 18);
1401 get_random_bytes(felica + 2, 6);
1402
1403 /* NFCID3 */
1404 nfcid3 = skb_put(skb, 10);
1405 memset(nfcid3, 0, 10);
1406 memcpy(nfcid3, felica, 8);
1407
1408 /* General bytes */
1409 *skb_put(skb, 1) = gbytes_len;
1410
1411 gb = skb_put(skb, gbytes_len);
1412 memcpy(gb, gbytes, gbytes_len);
1413
1414 /* Len Tk */
1415 *skb_put(skb, 1) = 0;
1416
1417 return skb;
1418 }
1419
1420 #define PN533_CMD_DATAEXCH_HEAD_LEN 1
1421 #define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
1422 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1423 struct sk_buff *resp)
1424 {
1425 u8 status;
1426
1427 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1428
1429 if (IS_ERR(resp))
1430 return PTR_ERR(resp);
1431
1432 status = resp->data[0];
1433 skb_pull(resp, sizeof(status));
1434
1435 if (status != 0) {
1436 nfc_tm_deactivated(dev->nfc_dev);
1437 dev->tgt_mode = 0;
1438 dev_kfree_skb(resp);
1439 return 0;
1440 }
1441
1442 return nfc_tm_data_received(dev->nfc_dev, resp);
1443 }
1444
1445 static void pn533_wq_tg_get_data(struct work_struct *work)
1446 {
1447 struct pn533 *dev = container_of(work, struct pn533, tg_work);
1448
1449 struct sk_buff *skb;
1450 int rc;
1451
1452 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1453
1454 skb = pn533_alloc_skb(0);
1455 if (!skb)
1456 return;
1457
1458 rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1459 pn533_tm_get_data_complete, NULL);
1460
1461 if (rc < 0)
1462 dev_kfree_skb(skb);
1463
1464 return;
1465 }
1466
1467 #define ATR_REQ_GB_OFFSET 17
1468 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1469 {
1470 u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1471 size_t gb_len;
1472 int rc;
1473
1474 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1475
1476 if (resp->len < ATR_REQ_GB_OFFSET + 1)
1477 return -EINVAL;
1478
1479 mode = resp->data[0];
1480 cmd = &resp->data[1];
1481
1482 nfc_dev_dbg(&dev->interface->dev, "Target mode 0x%x len %d\n",
1483 mode, resp->len);
1484
1485 if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1486 PN533_INIT_TARGET_RESP_ACTIVE)
1487 comm_mode = NFC_COMM_ACTIVE;
1488
1489 if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0) /* Only DEP supported */
1490 return -EOPNOTSUPP;
1491
1492 gb = cmd + ATR_REQ_GB_OFFSET;
1493 gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1494
1495 rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1496 comm_mode, gb, gb_len);
1497 if (rc < 0) {
1498 nfc_dev_err(&dev->interface->dev,
1499 "Error when signaling target activation");
1500 return rc;
1501 }
1502
1503 dev->tgt_mode = 1;
1504 queue_work(dev->wq, &dev->tg_work);
1505
1506 return 0;
1507 }
1508
1509 static void pn533_listen_mode_timer(unsigned long data)
1510 {
1511 struct pn533 *dev = (struct pn533 *)data;
1512
1513 nfc_dev_dbg(&dev->interface->dev, "Listen mode timeout");
1514
1515 /* An ack will cancel the last issued command (poll) */
1516 pn533_send_ack(dev, GFP_ATOMIC);
1517
1518 dev->cancel_listen = 1;
1519
1520 pn533_poll_next_mod(dev);
1521
1522 queue_work(dev->wq, &dev->poll_work);
1523 }
1524
1525 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1526 struct sk_buff *resp)
1527 {
1528 struct pn533_poll_modulations *cur_mod;
1529 int rc;
1530
1531 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1532
1533 if (IS_ERR(resp)) {
1534 rc = PTR_ERR(resp);
1535
1536 nfc_dev_err(&dev->interface->dev, "%s Poll complete error %d",
1537 __func__, rc);
1538
1539 if (rc == -ENOENT) {
1540 if (dev->poll_mod_count != 0)
1541 return rc;
1542 else
1543 goto stop_poll;
1544 } else if (rc < 0) {
1545 nfc_dev_err(&dev->interface->dev,
1546 "Error %d when running poll", rc);
1547 goto stop_poll;
1548 }
1549 }
1550
1551 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1552
1553 if (cur_mod->len == 0) { /* Target mode */
1554 del_timer(&dev->listen_timer);
1555 rc = pn533_init_target_complete(dev, resp);
1556 goto done;
1557 }
1558
1559 /* Initiator mode */
1560 rc = pn533_start_poll_complete(dev, resp);
1561 if (!rc)
1562 goto done;
1563
1564 pn533_poll_next_mod(dev);
1565 queue_work(dev->wq, &dev->poll_work);
1566
1567 done:
1568 dev_kfree_skb(resp);
1569 return rc;
1570
1571 stop_poll:
1572 nfc_dev_err(&dev->interface->dev, "Polling operation has been stopped");
1573
1574 pn533_poll_reset_mod_list(dev);
1575 dev->poll_protocols = 0;
1576 return rc;
1577 }
1578
1579 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533_poll_modulations
1580 *mod)
1581 {
1582 struct sk_buff *skb;
1583
1584 skb = pn533_alloc_skb(mod->len);
1585 if (!skb)
1586 return NULL;
1587
1588 memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
1589
1590 return skb;
1591 }
1592
1593 static int pn533_send_poll_frame(struct pn533 *dev)
1594 {
1595 struct pn533_poll_modulations *mod;
1596 struct sk_buff *skb;
1597 int rc;
1598 u8 cmd_code;
1599
1600 mod = dev->poll_mod_active[dev->poll_mod_curr];
1601
1602 nfc_dev_dbg(&dev->interface->dev, "%s mod len %d\n",
1603 __func__, mod->len);
1604
1605 if (mod->len == 0) { /* Listen mode */
1606 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1607 skb = pn533_alloc_poll_tg_frame(dev->gb, dev->gb_len);
1608 } else { /* Polling mode */
1609 cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET;
1610 skb = pn533_alloc_poll_in_frame(mod);
1611 }
1612
1613 if (!skb) {
1614 nfc_dev_err(&dev->interface->dev, "Failed to allocate skb.");
1615 return -ENOMEM;
1616 }
1617
1618 rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1619 NULL);
1620 if (rc < 0) {
1621 dev_kfree_skb(skb);
1622 nfc_dev_err(&dev->interface->dev, "Polling loop error %d", rc);
1623 }
1624
1625 return rc;
1626 }
1627
1628 static void pn533_wq_poll(struct work_struct *work)
1629 {
1630 struct pn533 *dev = container_of(work, struct pn533, poll_work);
1631 struct pn533_poll_modulations *cur_mod;
1632 int rc;
1633
1634 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1635
1636 nfc_dev_dbg(&dev->interface->dev,
1637 "%s cancel_listen %d modulation len %d",
1638 __func__, dev->cancel_listen, cur_mod->len);
1639
1640 if (dev->cancel_listen == 1) {
1641 dev->cancel_listen = 0;
1642 usb_kill_urb(dev->in_urb);
1643 }
1644
1645 rc = pn533_send_poll_frame(dev);
1646 if (rc)
1647 return;
1648
1649 if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1650 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1651
1652 return;
1653 }
1654
1655 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1656 u32 im_protocols, u32 tm_protocols)
1657 {
1658 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1659
1660 nfc_dev_dbg(&dev->interface->dev,
1661 "%s: im protocols 0x%x tm protocols 0x%x",
1662 __func__, im_protocols, tm_protocols);
1663
1664 if (dev->tgt_active_prot) {
1665 nfc_dev_err(&dev->interface->dev,
1666 "Cannot poll with a target already activated");
1667 return -EBUSY;
1668 }
1669
1670 if (dev->tgt_mode) {
1671 nfc_dev_err(&dev->interface->dev,
1672 "Cannot poll while already being activated");
1673 return -EBUSY;
1674 }
1675
1676 if (tm_protocols) {
1677 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1678 if (dev->gb == NULL)
1679 tm_protocols = 0;
1680 }
1681
1682 dev->poll_mod_curr = 0;
1683 pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1684 dev->poll_protocols = im_protocols;
1685 dev->listen_protocols = tm_protocols;
1686
1687 return pn533_send_poll_frame(dev);
1688 }
1689
1690 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1691 {
1692 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1693
1694 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1695
1696 del_timer(&dev->listen_timer);
1697
1698 if (!dev->poll_mod_count) {
1699 nfc_dev_dbg(&dev->interface->dev,
1700 "Polling operation was not running");
1701 return;
1702 }
1703
1704 /* An ack will cancel the last issued command (poll) */
1705 pn533_send_ack(dev, GFP_KERNEL);
1706
1707 /* prevent pn533_start_poll_complete to issue a new poll meanwhile */
1708 usb_kill_urb(dev->in_urb);
1709
1710 pn533_poll_reset_mod_list(dev);
1711 }
1712
1713 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1714 {
1715 struct pn533_cmd_activate_response *rsp;
1716 u16 gt_len;
1717 int rc;
1718
1719 struct sk_buff *skb;
1720 struct sk_buff *resp;
1721
1722 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1723
1724 skb = pn533_alloc_skb(sizeof(u8) * 2); /*TG + Next*/
1725 if (!skb)
1726 return -ENOMEM;
1727
1728 *skb_put(skb, sizeof(u8)) = 1; /* TG */
1729 *skb_put(skb, sizeof(u8)) = 0; /* Next */
1730
1731 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1732 if (IS_ERR(resp))
1733 return PTR_ERR(resp);
1734
1735 rsp = (struct pn533_cmd_activate_response *)resp->data;
1736 rc = rsp->status & PN533_CMD_RET_MASK;
1737 if (rc != PN533_CMD_RET_SUCCESS)
1738 dev_kfree_skb(resp);
1739 return -EIO;
1740
1741 /* ATR_RES general bytes are located at offset 16 */
1742 gt_len = resp->len - 16;
1743 rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1744
1745 dev_kfree_skb(resp);
1746 return rc;
1747 }
1748
1749 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1750 struct nfc_target *target, u32 protocol)
1751 {
1752 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1753 int rc;
1754
1755 nfc_dev_dbg(&dev->interface->dev, "%s - protocol=%u", __func__,
1756 protocol);
1757
1758 if (dev->poll_mod_count) {
1759 nfc_dev_err(&dev->interface->dev,
1760 "Cannot activate while polling");
1761 return -EBUSY;
1762 }
1763
1764 if (dev->tgt_active_prot) {
1765 nfc_dev_err(&dev->interface->dev,
1766 "There is already an active target");
1767 return -EBUSY;
1768 }
1769
1770 if (!dev->tgt_available_prots) {
1771 nfc_dev_err(&dev->interface->dev,
1772 "There is no available target to activate");
1773 return -EINVAL;
1774 }
1775
1776 if (!(dev->tgt_available_prots & (1 << protocol))) {
1777 nfc_dev_err(&dev->interface->dev,
1778 "Target doesn't support requested proto %u",
1779 protocol);
1780 return -EINVAL;
1781 }
1782
1783 if (protocol == NFC_PROTO_NFC_DEP) {
1784 rc = pn533_activate_target_nfcdep(dev);
1785 if (rc) {
1786 nfc_dev_err(&dev->interface->dev,
1787 "Activating target with DEP failed %d", rc);
1788 return rc;
1789 }
1790 }
1791
1792 dev->tgt_active_prot = protocol;
1793 dev->tgt_available_prots = 0;
1794
1795 return 0;
1796 }
1797
1798 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1799 struct nfc_target *target)
1800 {
1801 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1802
1803 struct sk_buff *skb;
1804 struct sk_buff *resp;
1805
1806 int rc;
1807
1808 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1809
1810 if (!dev->tgt_active_prot) {
1811 nfc_dev_err(&dev->interface->dev, "There is no active target");
1812 return;
1813 }
1814
1815 dev->tgt_active_prot = 0;
1816 skb_queue_purge(&dev->resp_q);
1817
1818 skb = pn533_alloc_skb(sizeof(u8));
1819 if (!skb)
1820 return;
1821
1822 *skb_put(skb, 1) = 1; /* TG*/
1823
1824 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_RELEASE, skb);
1825 if (IS_ERR(resp))
1826 return;
1827
1828 rc = resp->data[0] & PN533_CMD_RET_MASK;
1829 if (rc != PN533_CMD_RET_SUCCESS)
1830 nfc_dev_err(&dev->interface->dev,
1831 "Error 0x%x when releasing the target", rc);
1832
1833 dev_kfree_skb(resp);
1834 return;
1835 }
1836
1837
1838 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1839 struct sk_buff *resp)
1840 {
1841 struct pn533_cmd_jump_dep_response *rsp;
1842 u8 target_gt_len;
1843 int rc;
1844 u8 active = *(u8 *)arg;
1845
1846 kfree(arg);
1847
1848 if (IS_ERR(resp))
1849 return PTR_ERR(resp);
1850
1851 if (dev->tgt_available_prots &&
1852 !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1853 nfc_dev_err(&dev->interface->dev,
1854 "The target does not support DEP");
1855 rc = -EINVAL;
1856 goto error;
1857 }
1858
1859 rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1860
1861 rc = rsp->status & PN533_CMD_RET_MASK;
1862 if (rc != PN533_CMD_RET_SUCCESS) {
1863 nfc_dev_err(&dev->interface->dev,
1864 "Bringing DEP link up failed %d", rc);
1865 goto error;
1866 }
1867
1868 if (!dev->tgt_available_prots) {
1869 struct nfc_target nfc_target;
1870
1871 nfc_dev_dbg(&dev->interface->dev, "Creating new target");
1872
1873 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1874 nfc_target.nfcid1_len = 10;
1875 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1876 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1877 if (rc)
1878 goto error;
1879
1880 dev->tgt_available_prots = 0;
1881 }
1882
1883 dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1884
1885 /* ATR_RES general bytes are located at offset 17 */
1886 target_gt_len = resp->len - 17;
1887 rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1888 rsp->gt, target_gt_len);
1889 if (rc == 0)
1890 rc = nfc_dep_link_is_up(dev->nfc_dev,
1891 dev->nfc_dev->targets[0].idx,
1892 !active, NFC_RF_INITIATOR);
1893
1894 error:
1895 dev_kfree_skb(resp);
1896 return rc;
1897 }
1898
1899 static int pn533_mod_to_baud(struct pn533 *dev)
1900 {
1901 switch (dev->poll_mod_curr) {
1902 case PN533_POLL_MOD_106KBPS_A:
1903 return 0;
1904 case PN533_POLL_MOD_212KBPS_FELICA:
1905 return 1;
1906 case PN533_POLL_MOD_424KBPS_FELICA:
1907 return 2;
1908 default:
1909 return -EINVAL;
1910 }
1911 }
1912
1913 #define PASSIVE_DATA_LEN 5
1914 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1915 u8 comm_mode, u8 *gb, size_t gb_len)
1916 {
1917 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1918 struct sk_buff *skb;
1919 int rc, baud, skb_len;
1920 u8 *next, *arg;
1921
1922 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1923
1924 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1925
1926 if (dev->poll_mod_count) {
1927 nfc_dev_err(&dev->interface->dev,
1928 "Cannot bring the DEP link up while polling");
1929 return -EBUSY;
1930 }
1931
1932 if (dev->tgt_active_prot) {
1933 nfc_dev_err(&dev->interface->dev,
1934 "There is already an active target");
1935 return -EBUSY;
1936 }
1937
1938 baud = pn533_mod_to_baud(dev);
1939 if (baud < 0) {
1940 nfc_dev_err(&dev->interface->dev,
1941 "Invalid curr modulation %d", dev->poll_mod_curr);
1942 return baud;
1943 }
1944
1945 skb_len = 3 + gb_len; /* ActPass + BR + Next */
1946 if (comm_mode == NFC_COMM_PASSIVE)
1947 skb_len += PASSIVE_DATA_LEN;
1948
1949 skb = pn533_alloc_skb(skb_len);
1950 if (!skb)
1951 return -ENOMEM;
1952
1953 *skb_put(skb, 1) = !comm_mode; /* ActPass */
1954 *skb_put(skb, 1) = baud; /* Baud rate */
1955
1956 next = skb_put(skb, 1); /* Next */
1957 *next = 0;
1958
1959 if (comm_mode == NFC_COMM_PASSIVE && baud > 0) {
1960 memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data,
1961 PASSIVE_DATA_LEN);
1962 *next |= 1;
1963 }
1964
1965 if (gb != NULL && gb_len > 0) {
1966 memcpy(skb_put(skb, gb_len), gb, gb_len);
1967 *next |= 4; /* We have some Gi */
1968 } else {
1969 *next = 0;
1970 }
1971
1972 arg = kmalloc(sizeof(*arg), GFP_KERNEL);
1973 if (!arg) {
1974 dev_kfree_skb(skb);
1975 return -ENOMEM;
1976 }
1977
1978 *arg = !comm_mode;
1979
1980 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1981 pn533_in_dep_link_up_complete, arg);
1982
1983 if (rc < 0) {
1984 dev_kfree_skb(skb);
1985 kfree(arg);
1986 }
1987
1988 return rc;
1989 }
1990
1991 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
1992 {
1993 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1994
1995 pn533_poll_reset_mod_list(dev);
1996
1997 if (dev->tgt_mode || dev->tgt_active_prot) {
1998 pn533_send_ack(dev, GFP_KERNEL);
1999 usb_kill_urb(dev->in_urb);
2000 }
2001
2002 dev->tgt_active_prot = 0;
2003 dev->tgt_mode = 0;
2004
2005 skb_queue_purge(&dev->resp_q);
2006
2007 return 0;
2008 }
2009
2010 struct pn533_data_exchange_arg {
2011 data_exchange_cb_t cb;
2012 void *cb_context;
2013 };
2014
2015 static struct sk_buff *pn533_build_response(struct pn533 *dev)
2016 {
2017 struct sk_buff *skb, *tmp, *t;
2018 unsigned int skb_len = 0, tmp_len = 0;
2019
2020 nfc_dev_dbg(&dev->interface->dev, "%s\n", __func__);
2021
2022 if (skb_queue_empty(&dev->resp_q))
2023 return NULL;
2024
2025 if (skb_queue_len(&dev->resp_q) == 1) {
2026 skb = skb_dequeue(&dev->resp_q);
2027 goto out;
2028 }
2029
2030 skb_queue_walk_safe(&dev->resp_q, tmp, t)
2031 skb_len += tmp->len;
2032
2033 nfc_dev_dbg(&dev->interface->dev, "%s total length %d\n",
2034 __func__, skb_len);
2035
2036 skb = alloc_skb(skb_len, GFP_KERNEL);
2037 if (skb == NULL)
2038 goto out;
2039
2040 skb_put(skb, skb_len);
2041
2042 skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2043 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2044 tmp_len += tmp->len;
2045 }
2046
2047 out:
2048 skb_queue_purge(&dev->resp_q);
2049
2050 return skb;
2051 }
2052
2053 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2054 struct sk_buff *resp)
2055 {
2056 struct pn533_data_exchange_arg *arg = _arg;
2057 struct sk_buff *skb;
2058 int rc = 0;
2059 u8 status, ret, mi;
2060
2061 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2062
2063 if (IS_ERR(resp)) {
2064 rc = PTR_ERR(resp);
2065 goto _error;
2066 }
2067
2068 status = resp->data[0];
2069 ret = status & PN533_CMD_RET_MASK;
2070 mi = status & PN533_CMD_MI_MASK;
2071
2072 skb_pull(resp, sizeof(status));
2073
2074 if (ret != PN533_CMD_RET_SUCCESS) {
2075 nfc_dev_err(&dev->interface->dev,
2076 "PN533 reported error %d when exchanging data",
2077 ret);
2078 rc = -EIO;
2079 goto error;
2080 }
2081
2082 skb_queue_tail(&dev->resp_q, resp);
2083
2084 if (mi) {
2085 dev->cmd_complete_mi_arg = arg;
2086 queue_work(dev->wq, &dev->mi_work);
2087 return -EINPROGRESS;
2088 }
2089
2090 skb = pn533_build_response(dev);
2091 if (!skb)
2092 goto error;
2093
2094 arg->cb(arg->cb_context, skb, 0);
2095 kfree(arg);
2096 return 0;
2097
2098 error:
2099 dev_kfree_skb(resp);
2100 _error:
2101 skb_queue_purge(&dev->resp_q);
2102 arg->cb(arg->cb_context, NULL, rc);
2103 kfree(arg);
2104 return rc;
2105 }
2106
2107 static int pn533_transceive(struct nfc_dev *nfc_dev,
2108 struct nfc_target *target, struct sk_buff *skb,
2109 data_exchange_cb_t cb, void *cb_context)
2110 {
2111 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2112 struct pn533_data_exchange_arg *arg = NULL;
2113 int rc;
2114
2115 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2116
2117 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2118 /* TODO: Implement support to multi-part data exchange */
2119 nfc_dev_err(&dev->interface->dev,
2120 "Data length greater than the max allowed: %d",
2121 PN533_CMD_DATAEXCH_DATA_MAXLEN);
2122 rc = -ENOSYS;
2123 goto error;
2124 }
2125
2126 if (!dev->tgt_active_prot) {
2127 nfc_dev_err(&dev->interface->dev,
2128 "Can't exchange data if there is no active target");
2129 rc = -EINVAL;
2130 goto error;
2131 }
2132
2133 arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2134 if (!arg) {
2135 rc = -ENOMEM;
2136 goto error;
2137 }
2138
2139 arg->cb = cb;
2140 arg->cb_context = cb_context;
2141
2142 switch (dev->device_type) {
2143 case PN533_DEVICE_PASORI:
2144 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2145 rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2146 skb,
2147 pn533_data_exchange_complete,
2148 arg);
2149
2150 break;
2151 }
2152 default:
2153 *skb_push(skb, sizeof(u8)) = 1; /*TG*/
2154
2155 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2156 skb, pn533_data_exchange_complete,
2157 arg);
2158
2159 break;
2160 }
2161
2162 if (rc < 0) /* rc from send_async */
2163 goto error;
2164
2165 return 0;
2166
2167 error:
2168 kfree(arg);
2169 dev_kfree_skb(skb);
2170 return rc;
2171 }
2172
2173 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2174 struct sk_buff *resp)
2175 {
2176 u8 status;
2177
2178 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2179
2180 if (IS_ERR(resp))
2181 return PTR_ERR(resp);
2182
2183 status = resp->data[0];
2184
2185 dev_kfree_skb(resp);
2186
2187 if (status != 0) {
2188 nfc_tm_deactivated(dev->nfc_dev);
2189
2190 dev->tgt_mode = 0;
2191
2192 return 0;
2193 }
2194
2195 queue_work(dev->wq, &dev->tg_work);
2196
2197 return 0;
2198 }
2199
2200 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2201 {
2202 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2203 int rc;
2204
2205 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2206
2207 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2208 nfc_dev_err(&dev->interface->dev,
2209 "Data length greater than the max allowed: %d",
2210 PN533_CMD_DATAEXCH_DATA_MAXLEN);
2211 return -ENOSYS;
2212 }
2213
2214 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2215 pn533_tm_send_complete, NULL);
2216 if (rc < 0)
2217 dev_kfree_skb(skb);
2218
2219 return rc;
2220 }
2221
2222 static void pn533_wq_mi_recv(struct work_struct *work)
2223 {
2224 struct pn533 *dev = container_of(work, struct pn533, mi_work);
2225
2226 struct sk_buff *skb;
2227 int rc;
2228
2229 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2230
2231 skb = pn533_alloc_skb(PN533_CMD_DATAEXCH_HEAD_LEN);
2232 if (!skb)
2233 goto error;
2234
2235 switch (dev->device_type) {
2236 case PN533_DEVICE_PASORI:
2237 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2238 rc = pn533_send_cmd_direct_async(dev,
2239 PN533_CMD_IN_COMM_THRU,
2240 skb,
2241 pn533_data_exchange_complete,
2242 dev->cmd_complete_mi_arg);
2243
2244 break;
2245 }
2246 default:
2247 *skb_put(skb, sizeof(u8)) = 1; /*TG*/
2248
2249 rc = pn533_send_cmd_direct_async(dev,
2250 PN533_CMD_IN_DATA_EXCHANGE,
2251 skb,
2252 pn533_data_exchange_complete,
2253 dev->cmd_complete_mi_arg);
2254
2255 break;
2256 }
2257
2258 if (rc == 0) /* success */
2259 return;
2260
2261 nfc_dev_err(&dev->interface->dev,
2262 "Error %d when trying to perform data_exchange", rc);
2263
2264 dev_kfree_skb(skb);
2265 kfree(dev->cmd_complete_arg);
2266
2267 error:
2268 pn533_send_ack(dev, GFP_KERNEL);
2269 queue_work(dev->wq, &dev->cmd_work);
2270 }
2271
2272 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2273 u8 cfgdata_len)
2274 {
2275 struct sk_buff *skb;
2276 struct sk_buff *resp;
2277
2278 int skb_len;
2279
2280 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2281
2282 skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2283
2284 skb = pn533_alloc_skb(skb_len);
2285 if (!skb)
2286 return -ENOMEM;
2287
2288 *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2289 memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2290
2291 resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2292 if (IS_ERR(resp))
2293 return PTR_ERR(resp);
2294
2295 dev_kfree_skb(resp);
2296 return 0;
2297 }
2298
2299 static int pn533_get_firmware_version(struct pn533 *dev,
2300 struct pn533_fw_version *fv)
2301 {
2302 struct sk_buff *skb;
2303 struct sk_buff *resp;
2304
2305 skb = pn533_alloc_skb(0);
2306 if (!skb)
2307 return -ENOMEM;
2308
2309 resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2310 if (IS_ERR(resp))
2311 return PTR_ERR(resp);
2312
2313 fv->ic = resp->data[0];
2314 fv->ver = resp->data[1];
2315 fv->rev = resp->data[2];
2316 fv->support = resp->data[3];
2317
2318 dev_kfree_skb(resp);
2319 return 0;
2320 }
2321
2322 static int pn533_fw_reset(struct pn533 *dev)
2323 {
2324 struct sk_buff *skb;
2325 struct sk_buff *resp;
2326
2327 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2328
2329 skb = pn533_alloc_skb(sizeof(u8));
2330 if (!skb)
2331 return -ENOMEM;
2332
2333 *skb_put(skb, sizeof(u8)) = 0x1;
2334
2335 resp = pn533_send_cmd_sync(dev, 0x18, skb);
2336 if (IS_ERR(resp))
2337 return PTR_ERR(resp);
2338
2339 dev_kfree_skb(resp);
2340
2341 return 0;
2342 }
2343
2344 static struct nfc_ops pn533_nfc_ops = {
2345 .dev_up = NULL,
2346 .dev_down = NULL,
2347 .dep_link_up = pn533_dep_link_up,
2348 .dep_link_down = pn533_dep_link_down,
2349 .start_poll = pn533_start_poll,
2350 .stop_poll = pn533_stop_poll,
2351 .activate_target = pn533_activate_target,
2352 .deactivate_target = pn533_deactivate_target,
2353 .im_transceive = pn533_transceive,
2354 .tm_send = pn533_tm_send,
2355 };
2356
2357 static int pn533_setup(struct pn533 *dev)
2358 {
2359 struct pn533_config_max_retries max_retries;
2360 struct pn533_config_timing timing;
2361 u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2362 int rc;
2363
2364 switch (dev->device_type) {
2365 case PN533_DEVICE_STD:
2366 max_retries.mx_rty_atr = PN533_CONFIG_MAX_RETRIES_ENDLESS;
2367 max_retries.mx_rty_psl = 2;
2368 max_retries.mx_rty_passive_act =
2369 PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2370
2371 timing.rfu = PN533_CONFIG_TIMING_102;
2372 timing.atr_res_timeout = PN533_CONFIG_TIMING_204;
2373 timing.dep_timeout = PN533_CONFIG_TIMING_409;
2374
2375 break;
2376
2377 case PN533_DEVICE_PASORI:
2378 max_retries.mx_rty_atr = 0x2;
2379 max_retries.mx_rty_psl = 0x1;
2380 max_retries.mx_rty_passive_act =
2381 PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2382
2383 timing.rfu = PN533_CONFIG_TIMING_102;
2384 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2385 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2386
2387 break;
2388
2389 default:
2390 nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2391 dev->device_type);
2392 return -EINVAL;
2393 }
2394
2395 rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2396 (u8 *)&max_retries, sizeof(max_retries));
2397 if (rc) {
2398 nfc_dev_err(&dev->interface->dev,
2399 "Error on setting MAX_RETRIES config");
2400 return rc;
2401 }
2402
2403
2404 rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2405 (u8 *)&timing, sizeof(timing));
2406 if (rc) {
2407 nfc_dev_err(&dev->interface->dev,
2408 "Error on setting RF timings");
2409 return rc;
2410 }
2411
2412 switch (dev->device_type) {
2413 case PN533_DEVICE_STD:
2414 break;
2415
2416 case PN533_DEVICE_PASORI:
2417 pn533_fw_reset(dev);
2418
2419 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2420 pasori_cfg, 3);
2421 if (rc) {
2422 nfc_dev_err(&dev->interface->dev,
2423 "Error while settings PASORI config");
2424 return rc;
2425 }
2426
2427 pn533_fw_reset(dev);
2428
2429 break;
2430 }
2431
2432 return 0;
2433 }
2434
2435 static int pn533_probe(struct usb_interface *interface,
2436 const struct usb_device_id *id)
2437 {
2438 struct pn533_fw_version fw_ver;
2439 struct pn533 *dev;
2440 struct usb_host_interface *iface_desc;
2441 struct usb_endpoint_descriptor *endpoint;
2442 int in_endpoint = 0;
2443 int out_endpoint = 0;
2444 int rc = -ENOMEM;
2445 int i;
2446 u32 protocols;
2447
2448 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2449 if (!dev)
2450 return -ENOMEM;
2451
2452 dev->udev = usb_get_dev(interface_to_usbdev(interface));
2453 dev->interface = interface;
2454 mutex_init(&dev->cmd_lock);
2455
2456 iface_desc = interface->cur_altsetting;
2457 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
2458 endpoint = &iface_desc->endpoint[i].desc;
2459
2460 if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
2461 in_endpoint = endpoint->bEndpointAddress;
2462
2463 if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
2464 out_endpoint = endpoint->bEndpointAddress;
2465 }
2466
2467 if (!in_endpoint || !out_endpoint) {
2468 nfc_dev_err(&interface->dev,
2469 "Could not find bulk-in or bulk-out endpoint");
2470 rc = -ENODEV;
2471 goto error;
2472 }
2473
2474 dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
2475 dev->out_frame = kmalloc(PN533_NORMAL_FRAME_MAX_LEN, GFP_KERNEL);
2476 dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
2477
2478 if (!dev->out_frame || !dev->in_urb || !dev->out_urb)
2479 goto error;
2480
2481 usb_fill_bulk_urb(dev->in_urb, dev->udev,
2482 usb_rcvbulkpipe(dev->udev, in_endpoint),
2483 NULL, 0, NULL, dev);
2484 usb_fill_bulk_urb(dev->out_urb, dev->udev,
2485 usb_sndbulkpipe(dev->udev, out_endpoint),
2486 NULL, 0, pn533_send_complete, dev);
2487
2488 INIT_WORK(&dev->cmd_work, pn533_wq_cmd);
2489 INIT_WORK(&dev->cmd_complete_work, pn533_wq_cmd_complete);
2490 INIT_WORK(&dev->mi_work, pn533_wq_mi_recv);
2491 INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
2492 INIT_WORK(&dev->poll_work, pn533_wq_poll);
2493 dev->wq = alloc_ordered_workqueue("pn533", 0);
2494 if (dev->wq == NULL)
2495 goto error;
2496
2497 init_timer(&dev->listen_timer);
2498 dev->listen_timer.data = (unsigned long) dev;
2499 dev->listen_timer.function = pn533_listen_mode_timer;
2500
2501 skb_queue_head_init(&dev->resp_q);
2502
2503 INIT_LIST_HEAD(&dev->cmd_queue);
2504
2505 usb_set_intfdata(interface, dev);
2506
2507 memset(&fw_ver, 0, sizeof(fw_ver));
2508 rc = pn533_get_firmware_version(dev, &fw_ver);
2509 if (rc < 0)
2510 goto destroy_wq;
2511
2512 nfc_dev_info(&dev->interface->dev,
2513 "NXP PN533 firmware ver %d.%d now attached",
2514 fw_ver.ver, fw_ver.rev);
2515
2516 dev->device_type = id->driver_info;
2517 switch (dev->device_type) {
2518 case PN533_DEVICE_STD:
2519 protocols = PN533_ALL_PROTOCOLS;
2520 break;
2521
2522 case PN533_DEVICE_PASORI:
2523 protocols = PN533_NO_TYPE_B_PROTOCOLS;
2524 break;
2525
2526 default:
2527 nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2528 dev->device_type);
2529 rc = -EINVAL;
2530 goto destroy_wq;
2531 }
2532
2533 dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2534 PN533_FRAME_HEADER_LEN +
2535 PN533_CMD_DATAEXCH_HEAD_LEN,
2536 PN533_FRAME_TAIL_LEN);
2537 if (!dev->nfc_dev)
2538 goto destroy_wq;
2539
2540 nfc_set_parent_dev(dev->nfc_dev, &interface->dev);
2541 nfc_set_drvdata(dev->nfc_dev, dev);
2542
2543 rc = nfc_register_device(dev->nfc_dev);
2544 if (rc)
2545 goto free_nfc_dev;
2546
2547 rc = pn533_setup(dev);
2548 if (rc)
2549 goto unregister_nfc_dev;
2550
2551 return 0;
2552
2553 unregister_nfc_dev:
2554 nfc_unregister_device(dev->nfc_dev);
2555
2556 free_nfc_dev:
2557 nfc_free_device(dev->nfc_dev);
2558
2559 destroy_wq:
2560 destroy_workqueue(dev->wq);
2561 error:
2562 usb_free_urb(dev->in_urb);
2563 kfree(dev->out_frame);
2564 usb_free_urb(dev->out_urb);
2565 kfree(dev);
2566 return rc;
2567 }
2568
2569 static void pn533_disconnect(struct usb_interface *interface)
2570 {
2571 struct pn533 *dev;
2572 struct pn533_cmd *cmd, *n;
2573
2574 dev = usb_get_intfdata(interface);
2575 usb_set_intfdata(interface, NULL);
2576
2577 nfc_unregister_device(dev->nfc_dev);
2578 nfc_free_device(dev->nfc_dev);
2579
2580 usb_kill_urb(dev->in_urb);
2581 usb_kill_urb(dev->out_urb);
2582
2583 destroy_workqueue(dev->wq);
2584
2585 skb_queue_purge(&dev->resp_q);
2586
2587 del_timer(&dev->listen_timer);
2588
2589 list_for_each_entry_safe(cmd, n, &dev->cmd_queue, queue) {
2590 list_del(&cmd->queue);
2591 kfree(cmd);
2592 }
2593
2594 usb_free_urb(dev->in_urb);
2595 kfree(dev->out_frame);
2596 usb_free_urb(dev->out_urb);
2597 kfree(dev);
2598
2599 nfc_dev_info(&interface->dev, "NXP PN533 NFC device disconnected");
2600 }
2601
2602 static struct usb_driver pn533_driver = {
2603 .name = "pn533",
2604 .probe = pn533_probe,
2605 .disconnect = pn533_disconnect,
2606 .id_table = pn533_table,
2607 };
2608
2609 module_usb_driver(pn533_driver);
2610
2611 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>,"
2612 " Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2613 MODULE_DESCRIPTION("PN533 usb driver ver " VERSION);
2614 MODULE_VERSION(VERSION);
2615 MODULE_LICENSE("GPL");
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