?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mmc: mxs-mmc: move to use generic DMA helper
[linux-2.6.git] / drivers / nfc / pn533.c
blobf0f6763d67aefcf73dc7b87e118ebb42bef649f6
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_FRAME_HEADER_LEN (sizeof(struct pn533_frame) \
83 + 2) /* data[0] TFI, data[1] CC */
84 #define PN533_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
85
86 /*
87 * Max extended frame payload len, excluding TFI and CC
88 * which are already in PN533_FRAME_HEADER_LEN.
89 */
90 #define PN533_FRAME_MAX_PAYLOAD_LEN 263
91
92 #define PN533_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2),
93 Postamble (1) */
94 #define PN533_FRAME_CHECKSUM(f) (f->data[f->datalen])
95 #define PN533_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])
96
97 /* start of frame */
98 #define PN533_SOF 0x00FF
99
100 /* frame identifier: in/out/error */
101 #define PN533_FRAME_IDENTIFIER(f) (f->data[0])
102 #define PN533_DIR_OUT 0xD4
103 #define PN533_DIR_IN 0xD5
104
105 /* PN533 Commands */
106 #define PN533_FRAME_CMD(f) (f->data[1])
107
108 #define PN533_CMD_GET_FIRMWARE_VERSION 0x02
109 #define PN533_CMD_RF_CONFIGURATION 0x32
110 #define PN533_CMD_IN_DATA_EXCHANGE 0x40
111 #define PN533_CMD_IN_COMM_THRU 0x42
112 #define PN533_CMD_IN_LIST_PASSIVE_TARGET 0x4A
113 #define PN533_CMD_IN_ATR 0x50
114 #define PN533_CMD_IN_RELEASE 0x52
115 #define PN533_CMD_IN_JUMP_FOR_DEP 0x56
116
117 #define PN533_CMD_TG_INIT_AS_TARGET 0x8c
118 #define PN533_CMD_TG_GET_DATA 0x86
119 #define PN533_CMD_TG_SET_DATA 0x8e
120 #define PN533_CMD_UNDEF 0xff
121
122 #define PN533_CMD_RESPONSE(cmd) (cmd + 1)
123
124 /* PN533 Return codes */
125 #define PN533_CMD_RET_MASK 0x3F
126 #define PN533_CMD_MI_MASK 0x40
127 #define PN533_CMD_RET_SUCCESS 0x00
128
129 struct pn533;
130
131 typedef int (*pn533_cmd_complete_t) (struct pn533 *dev, void *arg, int status);
132
133 typedef int (*pn533_send_async_complete_t) (struct pn533 *dev, void *arg,
134 struct sk_buff *resp);
135
136 /* structs for pn533 commands */
137
138 /* PN533_CMD_GET_FIRMWARE_VERSION */
139 struct pn533_fw_version {
140 u8 ic;
141 u8 ver;
142 u8 rev;
143 u8 support;
144 };
145
146 /* PN533_CMD_RF_CONFIGURATION */
147 #define PN533_CFGITEM_TIMING 0x02
148 #define PN533_CFGITEM_MAX_RETRIES 0x05
149 #define PN533_CFGITEM_PASORI 0x82
150
151 #define PN533_CONFIG_TIMING_102 0xb
152 #define PN533_CONFIG_TIMING_204 0xc
153 #define PN533_CONFIG_TIMING_409 0xd
154 #define PN533_CONFIG_TIMING_819 0xe
155
156 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
157 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
158
159 struct pn533_config_max_retries {
160 u8 mx_rty_atr;
161 u8 mx_rty_psl;
162 u8 mx_rty_passive_act;
163 } __packed;
164
165 struct pn533_config_timing {
166 u8 rfu;
167 u8 atr_res_timeout;
168 u8 dep_timeout;
169 } __packed;
170
171 /* PN533_CMD_IN_LIST_PASSIVE_TARGET */
172
173 /* felica commands opcode */
174 #define PN533_FELICA_OPC_SENSF_REQ 0
175 #define PN533_FELICA_OPC_SENSF_RES 1
176 /* felica SENSF_REQ parameters */
177 #define PN533_FELICA_SENSF_SC_ALL 0xFFFF
178 #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
179 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
180 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
181
182 /* type B initiator_data values */
183 #define PN533_TYPE_B_AFI_ALL_FAMILIES 0
184 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
185 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
186
187 union pn533_cmd_poll_initdata {
188 struct {
189 u8 afi;
190 u8 polling_method;
191 } __packed type_b;
192 struct {
193 u8 opcode;
194 __be16 sc;
195 u8 rc;
196 u8 tsn;
197 } __packed felica;
198 };
199
200 /* Poll modulations */
201 enum {
202 PN533_POLL_MOD_106KBPS_A,
203 PN533_POLL_MOD_212KBPS_FELICA,
204 PN533_POLL_MOD_424KBPS_FELICA,
205 PN533_POLL_MOD_106KBPS_JEWEL,
206 PN533_POLL_MOD_847KBPS_B,
207 PN533_LISTEN_MOD,
208
209 __PN533_POLL_MOD_AFTER_LAST,
210 };
211 #define PN533_POLL_MOD_MAX (__PN533_POLL_MOD_AFTER_LAST - 1)
212
213 struct pn533_poll_modulations {
214 struct {
215 u8 maxtg;
216 u8 brty;
217 union pn533_cmd_poll_initdata initiator_data;
218 } __packed data;
219 u8 len;
220 };
221
222 static const struct pn533_poll_modulations poll_mod[] = {
223 [PN533_POLL_MOD_106KBPS_A] = {
224 .data = {
225 .maxtg = 1,
226 .brty = 0,
227 },
228 .len = 2,
229 },
230 [PN533_POLL_MOD_212KBPS_FELICA] = {
231 .data = {
232 .maxtg = 1,
233 .brty = 1,
234 .initiator_data.felica = {
235 .opcode = PN533_FELICA_OPC_SENSF_REQ,
236 .sc = PN533_FELICA_SENSF_SC_ALL,
237 .rc = PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE,
238 .tsn = 0,
239 },
240 },
241 .len = 7,
242 },
243 [PN533_POLL_MOD_424KBPS_FELICA] = {
244 .data = {
245 .maxtg = 1,
246 .brty = 2,
247 .initiator_data.felica = {
248 .opcode = PN533_FELICA_OPC_SENSF_REQ,
249 .sc = PN533_FELICA_SENSF_SC_ALL,
250 .rc = PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE,
251 .tsn = 0,
252 },
253 },
254 .len = 7,
255 },
256 [PN533_POLL_MOD_106KBPS_JEWEL] = {
257 .data = {
258 .maxtg = 1,
259 .brty = 4,
260 },
261 .len = 2,
262 },
263 [PN533_POLL_MOD_847KBPS_B] = {
264 .data = {
265 .maxtg = 1,
266 .brty = 8,
267 .initiator_data.type_b = {
268 .afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
269 .polling_method =
270 PN533_TYPE_B_POLL_METHOD_TIMESLOT,
271 },
272 },
273 .len = 3,
274 },
275 [PN533_LISTEN_MOD] = {
276 .len = 0,
277 },
278 };
279
280 /* PN533_CMD_IN_ATR */
281
282 struct pn533_cmd_activate_response {
283 u8 status;
284 u8 nfcid3t[10];
285 u8 didt;
286 u8 bst;
287 u8 brt;
288 u8 to;
289 u8 ppt;
290 /* optional */
291 u8 gt[];
292 } __packed;
293
294 struct pn533_cmd_jump_dep_response {
295 u8 status;
296 u8 tg;
297 u8 nfcid3t[10];
298 u8 didt;
299 u8 bst;
300 u8 brt;
301 u8 to;
302 u8 ppt;
303 /* optional */
304 u8 gt[];
305 } __packed;
306
307
308 /* PN533_TG_INIT_AS_TARGET */
309 #define PN533_INIT_TARGET_PASSIVE 0x1
310 #define PN533_INIT_TARGET_DEP 0x2
311
312 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
313 #define PN533_INIT_TARGET_RESP_ACTIVE 0x1
314 #define PN533_INIT_TARGET_RESP_DEP 0x4
315
316 struct pn533 {
317 struct usb_device *udev;
318 struct usb_interface *interface;
319 struct nfc_dev *nfc_dev;
320
321 struct urb *out_urb;
322 struct urb *in_urb;
323
324 struct sk_buff_head resp_q;
325
326 struct workqueue_struct *wq;
327 struct work_struct cmd_work;
328 struct work_struct cmd_complete_work;
329 struct work_struct poll_work;
330 struct work_struct mi_work;
331 struct work_struct tg_work;
332 struct timer_list listen_timer;
333 int wq_in_error;
334 int cancel_listen;
335
336 pn533_cmd_complete_t cmd_complete;
337 void *cmd_complete_arg;
338 void *cmd_complete_mi_arg;
339 struct mutex cmd_lock;
340 u8 cmd;
341
342 struct pn533_poll_modulations *poll_mod_active[PN533_POLL_MOD_MAX + 1];
343 u8 poll_mod_count;
344 u8 poll_mod_curr;
345 u32 poll_protocols;
346 u32 listen_protocols;
347
348 u8 *gb;
349 size_t gb_len;
350
351 u8 tgt_available_prots;
352 u8 tgt_active_prot;
353 u8 tgt_mode;
354
355 u32 device_type;
356
357 struct list_head cmd_queue;
358 u8 cmd_pending;
359
360 struct pn533_frame_ops *ops;
361 };
362
363 struct pn533_cmd {
364 struct list_head queue;
365 u8 cmd_code;
366 struct sk_buff *req;
367 struct sk_buff *resp;
368 int resp_len;
369 void *arg;
370 };
371
372 struct pn533_frame {
373 u8 preamble;
374 __be16 start_frame;
375 u8 datalen;
376 u8 datalen_checksum;
377 u8 data[];
378 } __packed;
379
380 struct pn533_frame_ops {
381 void (*tx_frame_init)(void *frame, u8 cmd_code);
382 void (*tx_frame_finish)(void *frame);
383 void (*tx_update_payload_len)(void *frame, int len);
384 int tx_header_len;
385 int tx_tail_len;
386
387 bool (*rx_is_frame_valid)(void *frame);
388 int (*rx_frame_size)(void *frame);
389 int rx_header_len;
390 int rx_tail_len;
391
392 int max_payload_len;
393 u8 (*get_cmd_code)(void *frame);
394 };
395
396 /* The rule: value + checksum = 0 */
397 static inline u8 pn533_checksum(u8 value)
398 {
399 return ~value + 1;
400 }
401
402 /* The rule: sum(data elements) + checksum = 0 */
403 static u8 pn533_data_checksum(u8 *data, int datalen)
404 {
405 u8 sum = 0;
406 int i;
407
408 for (i = 0; i < datalen; i++)
409 sum += data[i];
410
411 return pn533_checksum(sum);
412 }
413
414 static void pn533_tx_frame_init(void *_frame, u8 cmd_code)
415 {
416 struct pn533_frame *frame = _frame;
417
418 frame->preamble = 0;
419 frame->start_frame = cpu_to_be16(PN533_SOF);
420 PN533_FRAME_IDENTIFIER(frame) = PN533_DIR_OUT;
421 PN533_FRAME_CMD(frame) = cmd_code;
422 frame->datalen = 2;
423 }
424
425 static void pn533_tx_frame_finish(void *_frame)
426 {
427 struct pn533_frame *frame = _frame;
428
429 frame->datalen_checksum = pn533_checksum(frame->datalen);
430
431 PN533_FRAME_CHECKSUM(frame) =
432 pn533_data_checksum(frame->data, frame->datalen);
433
434 PN533_FRAME_POSTAMBLE(frame) = 0;
435 }
436
437 static void pn533_tx_update_payload_len(void *_frame, int len)
438 {
439 struct pn533_frame *frame = _frame;
440
441 frame->datalen += len;
442 }
443
444 static bool pn533_rx_frame_is_valid(void *_frame)
445 {
446 u8 checksum;
447 struct pn533_frame *frame = _frame;
448
449 if (frame->start_frame != cpu_to_be16(PN533_SOF))
450 return false;
451
452 checksum = pn533_checksum(frame->datalen);
453 if (checksum != frame->datalen_checksum)
454 return false;
455
456 checksum = pn533_data_checksum(frame->data, frame->datalen);
457 if (checksum != PN533_FRAME_CHECKSUM(frame))
458 return false;
459
460 return true;
461 }
462
463 static bool pn533_rx_frame_is_ack(struct pn533_frame *frame)
464 {
465 if (frame->start_frame != cpu_to_be16(PN533_SOF))
466 return false;
467
468 if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
469 return false;
470
471 return true;
472 }
473
474 static inline int pn533_rx_frame_size(void *frame)
475 {
476 struct pn533_frame *f = frame;
477
478 return sizeof(struct pn533_frame) + f->datalen + PN533_FRAME_TAIL_LEN;
479 }
480
481 static u8 pn533_get_cmd_code(void *frame)
482 {
483 struct pn533_frame *f = frame;
484
485 return PN533_FRAME_CMD(f);
486 }
487
488 static struct pn533_frame_ops pn533_std_frame_ops = {
489 .tx_frame_init = pn533_tx_frame_init,
490 .tx_frame_finish = pn533_tx_frame_finish,
491 .tx_update_payload_len = pn533_tx_update_payload_len,
492 .tx_header_len = PN533_FRAME_HEADER_LEN,
493 .tx_tail_len = PN533_FRAME_TAIL_LEN,
494
495 .rx_is_frame_valid = pn533_rx_frame_is_valid,
496 .rx_frame_size = pn533_rx_frame_size,
497 .rx_header_len = PN533_FRAME_HEADER_LEN,
498 .rx_tail_len = PN533_FRAME_TAIL_LEN,
499
500 .max_payload_len = PN533_FRAME_MAX_PAYLOAD_LEN,
501 .get_cmd_code = pn533_get_cmd_code,
502 };
503
504 static bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
505 {
506 return (dev->ops->get_cmd_code(frame) == PN533_CMD_RESPONSE(dev->cmd));
507 }
508
509
510 static void pn533_wq_cmd_complete(struct work_struct *work)
511 {
512 struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
513 int rc;
514
515 rc = dev->cmd_complete(dev, dev->cmd_complete_arg, dev->wq_in_error);
516 if (rc != -EINPROGRESS)
517 queue_work(dev->wq, &dev->cmd_work);
518 }
519
520 static void pn533_recv_response(struct urb *urb)
521 {
522 struct pn533 *dev = urb->context;
523 u8 *in_frame;
524
525 switch (urb->status) {
526 case 0:
527 break; /* success */
528 case -ECONNRESET:
529 case -ENOENT:
530 nfc_dev_dbg(&dev->interface->dev,
531 "The urb has been canceled (status %d)",
532 urb->status);
533 dev->wq_in_error = urb->status;
534 goto sched_wq;
535 case -ESHUTDOWN:
536 default:
537 nfc_dev_err(&dev->interface->dev,
538 "Urb failure (status %d)", urb->status);
539 dev->wq_in_error = urb->status;
540 goto sched_wq;
541 }
542
543 in_frame = dev->in_urb->transfer_buffer;
544
545 nfc_dev_dbg(&dev->interface->dev, "Received a frame.");
546 print_hex_dump(KERN_DEBUG, "PN533 RX: ", DUMP_PREFIX_NONE, 16, 1,
547 in_frame, dev->ops->rx_frame_size(in_frame), false);
548
549 if (!dev->ops->rx_is_frame_valid(in_frame)) {
550 nfc_dev_err(&dev->interface->dev, "Received an invalid frame");
551 dev->wq_in_error = -EIO;
552 goto sched_wq;
553 }
554
555 if (!pn533_rx_frame_is_cmd_response(dev, in_frame)) {
556 nfc_dev_err(&dev->interface->dev,
557 "It it not the response to the last command");
558 dev->wq_in_error = -EIO;
559 goto sched_wq;
560 }
561
562 dev->wq_in_error = 0;
563
564 sched_wq:
565 queue_work(dev->wq, &dev->cmd_complete_work);
566 }
567
568 static int pn533_submit_urb_for_response(struct pn533 *dev, gfp_t flags)
569 {
570 dev->in_urb->complete = pn533_recv_response;
571
572 return usb_submit_urb(dev->in_urb, flags);
573 }
574
575 static void pn533_recv_ack(struct urb *urb)
576 {
577 struct pn533 *dev = urb->context;
578 struct pn533_frame *in_frame;
579 int rc;
580
581 switch (urb->status) {
582 case 0:
583 break; /* success */
584 case -ECONNRESET:
585 case -ENOENT:
586 nfc_dev_dbg(&dev->interface->dev,
587 "The urb has been stopped (status %d)",
588 urb->status);
589 dev->wq_in_error = urb->status;
590 goto sched_wq;
591 case -ESHUTDOWN:
592 default:
593 nfc_dev_err(&dev->interface->dev,
594 "Urb failure (status %d)", urb->status);
595 dev->wq_in_error = urb->status;
596 goto sched_wq;
597 }
598
599 in_frame = dev->in_urb->transfer_buffer;
600
601 if (!pn533_rx_frame_is_ack(in_frame)) {
602 nfc_dev_err(&dev->interface->dev, "Received an invalid ack");
603 dev->wq_in_error = -EIO;
604 goto sched_wq;
605 }
606
607 rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
608 if (rc) {
609 nfc_dev_err(&dev->interface->dev,
610 "usb_submit_urb failed with result %d", rc);
611 dev->wq_in_error = rc;
612 goto sched_wq;
613 }
614
615 return;
616
617 sched_wq:
618 queue_work(dev->wq, &dev->cmd_complete_work);
619 }
620
621 static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags)
622 {
623 dev->in_urb->complete = pn533_recv_ack;
624
625 return usb_submit_urb(dev->in_urb, flags);
626 }
627
628 static int pn533_send_ack(struct pn533 *dev, gfp_t flags)
629 {
630 u8 ack[PN533_FRAME_ACK_SIZE] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
631 /* spec 7.1.1.3: Preamble, SoPC (2), ACK Code (2), Postamble */
632 int rc;
633
634 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
635
636 dev->out_urb->transfer_buffer = ack;
637 dev->out_urb->transfer_buffer_length = sizeof(ack);
638 rc = usb_submit_urb(dev->out_urb, flags);
639
640 return rc;
641 }
642
643 static int __pn533_send_frame_async(struct pn533 *dev,
644 struct sk_buff *out,
645 struct sk_buff *in,
646 int in_len,
647 pn533_cmd_complete_t cmd_complete,
648 void *arg)
649 {
650 int rc;
651
652 dev->cmd = dev->ops->get_cmd_code(out->data);
653 dev->cmd_complete = cmd_complete;
654 dev->cmd_complete_arg = arg;
655
656 dev->out_urb->transfer_buffer = out->data;
657 dev->out_urb->transfer_buffer_length = out->len;
658
659 dev->in_urb->transfer_buffer = in->data;
660 dev->in_urb->transfer_buffer_length = in_len;
661
662 print_hex_dump(KERN_DEBUG, "PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
663 out->data, out->len, false);
664
665 rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
666 if (rc)
667 return rc;
668
669 rc = pn533_submit_urb_for_ack(dev, GFP_KERNEL);
670 if (rc)
671 goto error;
672
673 return 0;
674
675 error:
676 usb_unlink_urb(dev->out_urb);
677 return rc;
678 }
679
680 static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
681 struct sk_buff *skb)
682 {
683 /* payload is already there, just update datalen */
684 int payload_len = skb->len;
685 struct pn533_frame_ops *ops = dev->ops;
686
687
688 skb_push(skb, ops->tx_header_len);
689 skb_put(skb, ops->tx_tail_len);
690
691 ops->tx_frame_init(skb->data, cmd_code);
692 ops->tx_update_payload_len(skb->data, payload_len);
693 ops->tx_frame_finish(skb->data);
694 }
695
696 struct pn533_send_async_complete_arg {
697 pn533_send_async_complete_t complete_cb;
698 void *complete_cb_context;
699 struct sk_buff *resp;
700 struct sk_buff *req;
701 };
702
703 static int pn533_send_async_complete(struct pn533 *dev, void *_arg, int status)
704 {
705 struct pn533_send_async_complete_arg *arg = _arg;
706
707 struct sk_buff *req = arg->req;
708 struct sk_buff *resp = arg->resp;
709
710 int rc;
711
712 dev_kfree_skb(req);
713
714 if (status < 0) {
715 arg->complete_cb(dev, arg->complete_cb_context,
716 ERR_PTR(status));
717 dev_kfree_skb(resp);
718 kfree(arg);
719 return status;
720 }
721
722 skb_put(resp, dev->ops->rx_frame_size(resp->data));
723 skb_pull(resp, dev->ops->rx_header_len);
724 skb_trim(resp, resp->len - dev->ops->rx_tail_len);
725
726 rc = arg->complete_cb(dev, arg->complete_cb_context, resp);
727
728 kfree(arg);
729 return rc;
730 }
731
732 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
733 struct sk_buff *req, struct sk_buff *resp,
734 int resp_len,
735 pn533_send_async_complete_t complete_cb,
736 void *complete_cb_context)
737 {
738 struct pn533_cmd *cmd;
739 struct pn533_send_async_complete_arg *arg;
740 int rc = 0;
741
742 nfc_dev_dbg(&dev->interface->dev, "Sending command 0x%x", cmd_code);
743
744 arg = kzalloc(sizeof(*arg), GFP_KERNEL);
745 if (!arg)
746 return -ENOMEM;
747
748 arg->complete_cb = complete_cb;
749 arg->complete_cb_context = complete_cb_context;
750 arg->resp = resp;
751 arg->req = req;
752
753 pn533_build_cmd_frame(dev, cmd_code, req);
754
755 mutex_lock(&dev->cmd_lock);
756
757 if (!dev->cmd_pending) {
758 rc = __pn533_send_frame_async(dev, req, resp, resp_len,
759 pn533_send_async_complete, arg);
760 if (rc)
761 goto error;
762
763 dev->cmd_pending = 1;
764 goto unlock;
765 }
766
767 nfc_dev_dbg(&dev->interface->dev, "%s Queueing command 0x%x", __func__,
768 cmd_code);
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->resp_len = resp_len;
781 cmd->arg = arg;
782
783 list_add_tail(&cmd->queue, &dev->cmd_queue);
784
785 goto unlock;
786
787 error:
788 kfree(arg);
789 unlock:
790 mutex_unlock(&dev->cmd_lock);
791 return rc;
792 }
793
794 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
795 struct sk_buff *req,
796 pn533_send_async_complete_t complete_cb,
797 void *complete_cb_context)
798 {
799 struct sk_buff *resp;
800 int rc;
801 int resp_len = dev->ops->rx_header_len +
802 dev->ops->max_payload_len +
803 dev->ops->rx_tail_len;
804
805 resp = nfc_alloc_recv_skb(resp_len, GFP_KERNEL);
806 if (!resp)
807 return -ENOMEM;
808
809 rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
810 complete_cb_context);
811 if (rc)
812 dev_kfree_skb(resp);
813
814 return rc;
815 }
816
817 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
818 struct sk_buff *req,
819 pn533_send_async_complete_t complete_cb,
820 void *complete_cb_context)
821 {
822 struct sk_buff *resp;
823 int rc;
824 int resp_len = dev->ops->rx_header_len +
825 dev->ops->max_payload_len +
826 dev->ops->rx_tail_len;
827
828 resp = alloc_skb(resp_len, GFP_KERNEL);
829 if (!resp)
830 return -ENOMEM;
831
832 rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
833 complete_cb_context);
834 if (rc)
835 dev_kfree_skb(resp);
836
837 return rc;
838 }
839
840 /*
841 * pn533_send_cmd_direct_async
842 *
843 * The function sends a piority cmd directly to the chip omiting the cmd
844 * queue. It's intended to be used by chaining mechanism of received responses
845 * where the host has to request every single chunk of data before scheduling
846 * next cmd from the queue.
847 */
848 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
849 struct sk_buff *req,
850 pn533_send_async_complete_t complete_cb,
851 void *complete_cb_context)
852 {
853 struct pn533_send_async_complete_arg *arg;
854 struct sk_buff *resp;
855 int rc;
856 int resp_len = dev->ops->rx_header_len +
857 dev->ops->max_payload_len +
858 dev->ops->rx_tail_len;
859
860 resp = alloc_skb(resp_len, GFP_KERNEL);
861 if (!resp)
862 return -ENOMEM;
863
864 arg = kzalloc(sizeof(*arg), GFP_KERNEL);
865 if (!arg) {
866 dev_kfree_skb(resp);
867 return -ENOMEM;
868 }
869
870 arg->complete_cb = complete_cb;
871 arg->complete_cb_context = complete_cb_context;
872 arg->resp = resp;
873 arg->req = req;
874
875 pn533_build_cmd_frame(dev, cmd_code, req);
876
877 rc = __pn533_send_frame_async(dev, req, resp, resp_len,
878 pn533_send_async_complete, arg);
879 if (rc < 0) {
880 dev_kfree_skb(resp);
881 kfree(arg);
882 }
883
884 return rc;
885 }
886
887 static void pn533_wq_cmd(struct work_struct *work)
888 {
889 struct pn533 *dev = container_of(work, struct pn533, cmd_work);
890 struct pn533_cmd *cmd;
891
892 mutex_lock(&dev->cmd_lock);
893
894 if (list_empty(&dev->cmd_queue)) {
895 dev->cmd_pending = 0;
896 mutex_unlock(&dev->cmd_lock);
897 return;
898 }
899
900 cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
901
902 list_del(&cmd->queue);
903
904 mutex_unlock(&dev->cmd_lock);
905
906 __pn533_send_frame_async(dev, cmd->req, cmd->resp, cmd->resp_len,
907 pn533_send_async_complete, cmd->arg);
908
909 kfree(cmd);
910 }
911
912 struct pn533_sync_cmd_response {
913 struct sk_buff *resp;
914 struct completion done;
915 };
916
917 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
918 struct sk_buff *resp)
919 {
920 struct pn533_sync_cmd_response *arg = _arg;
921
922 arg->resp = resp;
923 complete(&arg->done);
924
925 return 0;
926 }
927
928 /* pn533_send_cmd_sync
929 *
930 * Please note the req parameter is freed inside the function to
931 * limit a number of return value interpretations by the caller.
932 *
933 * 1. negative in case of error during TX path -> req should be freed
934 *
935 * 2. negative in case of error during RX path -> req should not be freed
936 * as it's been already freed at the begining of RX path by
937 * async_complete_cb.
938 *
939 * 3. valid pointer in case of succesfult RX path
940 *
941 * A caller has to check a return value with IS_ERR macro. If the test pass,
942 * the returned pointer is valid.
943 *
944 * */
945 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
946 struct sk_buff *req)
947 {
948 int rc;
949 struct pn533_sync_cmd_response arg;
950
951 init_completion(&arg.done);
952
953 rc = pn533_send_cmd_async(dev, cmd_code, req,
954 pn533_send_sync_complete, &arg);
955 if (rc) {
956 dev_kfree_skb(req);
957 return ERR_PTR(rc);
958 }
959
960 wait_for_completion(&arg.done);
961
962 return arg.resp;
963 }
964
965 static void pn533_send_complete(struct urb *urb)
966 {
967 struct pn533 *dev = urb->context;
968
969 switch (urb->status) {
970 case 0:
971 break; /* success */
972 case -ECONNRESET:
973 case -ENOENT:
974 nfc_dev_dbg(&dev->interface->dev,
975 "The urb has been stopped (status %d)",
976 urb->status);
977 break;
978 case -ESHUTDOWN:
979 default:
980 nfc_dev_err(&dev->interface->dev,
981 "Urb failure (status %d)", urb->status);
982 }
983 }
984
985 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
986 {
987 struct sk_buff *skb;
988
989 skb = alloc_skb(dev->ops->tx_header_len +
990 size +
991 dev->ops->tx_tail_len, GFP_KERNEL);
992
993 if (skb)
994 skb_reserve(skb, dev->ops->tx_header_len);
995
996 return skb;
997 }
998
999 struct pn533_target_type_a {
1000 __be16 sens_res;
1001 u8 sel_res;
1002 u8 nfcid_len;
1003 u8 nfcid_data[];
1004 } __packed;
1005
1006
1007 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
1008 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
1009 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
1010
1011 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
1012 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
1013
1014 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
1015 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
1016
1017 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
1018 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
1019 #define PN533_TYPE_A_SEL_PROT_DEP 2
1020 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
1021
1022 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
1023 int target_data_len)
1024 {
1025 u8 ssd;
1026 u8 platconf;
1027
1028 if (target_data_len < sizeof(struct pn533_target_type_a))
1029 return false;
1030
1031 /* The lenght check of nfcid[] and ats[] are not being performed because
1032 the values are not being used */
1033
1034 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1035 ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
1036 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
1037
1038 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1039 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1040 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1041 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1042 return false;
1043
1044 /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
1045 if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
1046 return false;
1047
1048 return true;
1049 }
1050
1051 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
1052 int tgt_data_len)
1053 {
1054 struct pn533_target_type_a *tgt_type_a;
1055
1056 tgt_type_a = (struct pn533_target_type_a *)tgt_data;
1057
1058 if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
1059 return -EPROTO;
1060
1061 switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
1062 case PN533_TYPE_A_SEL_PROT_MIFARE:
1063 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
1064 break;
1065 case PN533_TYPE_A_SEL_PROT_ISO14443:
1066 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
1067 break;
1068 case PN533_TYPE_A_SEL_PROT_DEP:
1069 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1070 break;
1071 case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
1072 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
1073 NFC_PROTO_NFC_DEP_MASK;
1074 break;
1075 }
1076
1077 nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
1078 nfc_tgt->sel_res = tgt_type_a->sel_res;
1079 nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
1080 memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
1081
1082 return 0;
1083 }
1084
1085 struct pn533_target_felica {
1086 u8 pol_res;
1087 u8 opcode;
1088 u8 nfcid2[8];
1089 u8 pad[8];
1090 /* optional */
1091 u8 syst_code[];
1092 } __packed;
1093
1094 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
1095 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
1096
1097 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
1098 int target_data_len)
1099 {
1100 if (target_data_len < sizeof(struct pn533_target_felica))
1101 return false;
1102
1103 if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
1104 return false;
1105
1106 return true;
1107 }
1108
1109 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
1110 int tgt_data_len)
1111 {
1112 struct pn533_target_felica *tgt_felica;
1113
1114 tgt_felica = (struct pn533_target_felica *)tgt_data;
1115
1116 if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
1117 return -EPROTO;
1118
1119 if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
1120 (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
1121 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1122 else
1123 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
1124
1125 memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
1126 nfc_tgt->sensf_res_len = 9;
1127
1128 return 0;
1129 }
1130
1131 struct pn533_target_jewel {
1132 __be16 sens_res;
1133 u8 jewelid[4];
1134 } __packed;
1135
1136 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
1137 int target_data_len)
1138 {
1139 u8 ssd;
1140 u8 platconf;
1141
1142 if (target_data_len < sizeof(struct pn533_target_jewel))
1143 return false;
1144
1145 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1146 ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
1147 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
1148
1149 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1150 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1151 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1152 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1153 return false;
1154
1155 return true;
1156 }
1157
1158 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
1159 int tgt_data_len)
1160 {
1161 struct pn533_target_jewel *tgt_jewel;
1162
1163 tgt_jewel = (struct pn533_target_jewel *)tgt_data;
1164
1165 if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
1166 return -EPROTO;
1167
1168 nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
1169 nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
1170 nfc_tgt->nfcid1_len = 4;
1171 memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
1172
1173 return 0;
1174 }
1175
1176 struct pn533_type_b_prot_info {
1177 u8 bitrate;
1178 u8 fsci_type;
1179 u8 fwi_adc_fo;
1180 } __packed;
1181
1182 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
1183 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
1184 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
1185
1186 struct pn533_type_b_sens_res {
1187 u8 opcode;
1188 u8 nfcid[4];
1189 u8 appdata[4];
1190 struct pn533_type_b_prot_info prot_info;
1191 } __packed;
1192
1193 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
1194
1195 struct pn533_target_type_b {
1196 struct pn533_type_b_sens_res sensb_res;
1197 u8 attrib_res_len;
1198 u8 attrib_res[];
1199 } __packed;
1200
1201 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
1202 int target_data_len)
1203 {
1204 if (target_data_len < sizeof(struct pn533_target_type_b))
1205 return false;
1206
1207 if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
1208 return false;
1209
1210 if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
1211 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
1212 return false;
1213
1214 return true;
1215 }
1216
1217 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
1218 int tgt_data_len)
1219 {
1220 struct pn533_target_type_b *tgt_type_b;
1221
1222 tgt_type_b = (struct pn533_target_type_b *)tgt_data;
1223
1224 if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
1225 return -EPROTO;
1226
1227 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
1228
1229 return 0;
1230 }
1231
1232 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
1233 int tgdata_len)
1234 {
1235 struct nfc_target nfc_tgt;
1236 int rc;
1237
1238 nfc_dev_dbg(&dev->interface->dev, "%s - modulation=%d", __func__,
1239 dev->poll_mod_curr);
1240
1241 if (tg != 1)
1242 return -EPROTO;
1243
1244 memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1245
1246 switch (dev->poll_mod_curr) {
1247 case PN533_POLL_MOD_106KBPS_A:
1248 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
1249 break;
1250 case PN533_POLL_MOD_212KBPS_FELICA:
1251 case PN533_POLL_MOD_424KBPS_FELICA:
1252 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
1253 break;
1254 case PN533_POLL_MOD_106KBPS_JEWEL:
1255 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
1256 break;
1257 case PN533_POLL_MOD_847KBPS_B:
1258 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
1259 break;
1260 default:
1261 nfc_dev_err(&dev->interface->dev,
1262 "Unknown current poll modulation");
1263 return -EPROTO;
1264 }
1265
1266 if (rc)
1267 return rc;
1268
1269 if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1270 nfc_dev_dbg(&dev->interface->dev,
1271 "The Tg found doesn't have the desired protocol");
1272 return -EAGAIN;
1273 }
1274
1275 nfc_dev_dbg(&dev->interface->dev,
1276 "Target found - supported protocols: 0x%x",
1277 nfc_tgt.supported_protocols);
1278
1279 dev->tgt_available_prots = nfc_tgt.supported_protocols;
1280
1281 nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1282
1283 return 0;
1284 }
1285
1286 static inline void pn533_poll_next_mod(struct pn533 *dev)
1287 {
1288 dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
1289 }
1290
1291 static void pn533_poll_reset_mod_list(struct pn533 *dev)
1292 {
1293 dev->poll_mod_count = 0;
1294 }
1295
1296 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
1297 {
1298 dev->poll_mod_active[dev->poll_mod_count] =
1299 (struct pn533_poll_modulations *)&poll_mod[mod_index];
1300 dev->poll_mod_count++;
1301 }
1302
1303 static void pn533_poll_create_mod_list(struct pn533 *dev,
1304 u32 im_protocols, u32 tm_protocols)
1305 {
1306 pn533_poll_reset_mod_list(dev);
1307
1308 if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
1309 (im_protocols & NFC_PROTO_ISO14443_MASK) ||
1310 (im_protocols & NFC_PROTO_NFC_DEP_MASK))
1311 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
1312
1313 if (im_protocols & NFC_PROTO_FELICA_MASK ||
1314 im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1315 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
1316 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
1317 }
1318
1319 if (im_protocols & NFC_PROTO_JEWEL_MASK)
1320 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
1321
1322 if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1323 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
1324
1325 if (tm_protocols)
1326 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
1327 }
1328
1329 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
1330 {
1331 u8 nbtg, tg, *tgdata;
1332 int rc, tgdata_len;
1333
1334 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1335
1336 nbtg = resp->data[0];
1337 tg = resp->data[1];
1338 tgdata = &resp->data[2];
1339 tgdata_len = resp->len - 2; /* nbtg + tg */
1340
1341 if (nbtg) {
1342 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1343
1344 /* We must stop the poll after a valid target found */
1345 if (rc == 0) {
1346 pn533_poll_reset_mod_list(dev);
1347 return 0;
1348 }
1349 }
1350
1351 return -EAGAIN;
1352 }
1353
1354 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1355 {
1356 struct sk_buff *skb;
1357 u8 *felica, *nfcid3, *gb;
1358
1359 u8 *gbytes = dev->gb;
1360 size_t gbytes_len = dev->gb_len;
1361
1362 u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1363 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1364 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1365 0xff, 0xff}; /* System code */
1366
1367 u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1368 0x0, 0x0, 0x0,
1369 0x40}; /* SEL_RES for DEP */
1370
1371 unsigned int skb_len = 36 + /* mode (1), mifare (6),
1372 felica (18), nfcid3 (10), gb_len (1) */
1373 gbytes_len +
1374 1; /* len Tk*/
1375
1376 skb = pn533_alloc_skb(dev, skb_len);
1377 if (!skb)
1378 return NULL;
1379
1380 /* DEP support only */
1381 *skb_put(skb, 1) = PN533_INIT_TARGET_DEP;
1382
1383 /* MIFARE params */
1384 memcpy(skb_put(skb, 6), mifare_params, 6);
1385
1386 /* Felica params */
1387 felica = skb_put(skb, 18);
1388 memcpy(felica, felica_params, 18);
1389 get_random_bytes(felica + 2, 6);
1390
1391 /* NFCID3 */
1392 nfcid3 = skb_put(skb, 10);
1393 memset(nfcid3, 0, 10);
1394 memcpy(nfcid3, felica, 8);
1395
1396 /* General bytes */
1397 *skb_put(skb, 1) = gbytes_len;
1398
1399 gb = skb_put(skb, gbytes_len);
1400 memcpy(gb, gbytes, gbytes_len);
1401
1402 /* Len Tk */
1403 *skb_put(skb, 1) = 0;
1404
1405 return skb;
1406 }
1407
1408 #define PN533_CMD_DATAEXCH_HEAD_LEN 1
1409 #define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
1410 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1411 struct sk_buff *resp)
1412 {
1413 u8 status;
1414
1415 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1416
1417 if (IS_ERR(resp))
1418 return PTR_ERR(resp);
1419
1420 status = resp->data[0];
1421 skb_pull(resp, sizeof(status));
1422
1423 if (status != 0) {
1424 nfc_tm_deactivated(dev->nfc_dev);
1425 dev->tgt_mode = 0;
1426 dev_kfree_skb(resp);
1427 return 0;
1428 }
1429
1430 return nfc_tm_data_received(dev->nfc_dev, resp);
1431 }
1432
1433 static void pn533_wq_tg_get_data(struct work_struct *work)
1434 {
1435 struct pn533 *dev = container_of(work, struct pn533, tg_work);
1436
1437 struct sk_buff *skb;
1438 int rc;
1439
1440 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1441
1442 skb = pn533_alloc_skb(dev, 0);
1443 if (!skb)
1444 return;
1445
1446 rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1447 pn533_tm_get_data_complete, NULL);
1448
1449 if (rc < 0)
1450 dev_kfree_skb(skb);
1451
1452 return;
1453 }
1454
1455 #define ATR_REQ_GB_OFFSET 17
1456 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1457 {
1458 u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1459 size_t gb_len;
1460 int rc;
1461
1462 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1463
1464 if (resp->len < ATR_REQ_GB_OFFSET + 1)
1465 return -EINVAL;
1466
1467 mode = resp->data[0];
1468 cmd = &resp->data[1];
1469
1470 nfc_dev_dbg(&dev->interface->dev, "Target mode 0x%x len %d\n",
1471 mode, resp->len);
1472
1473 if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1474 PN533_INIT_TARGET_RESP_ACTIVE)
1475 comm_mode = NFC_COMM_ACTIVE;
1476
1477 if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0) /* Only DEP supported */
1478 return -EOPNOTSUPP;
1479
1480 gb = cmd + ATR_REQ_GB_OFFSET;
1481 gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1482
1483 rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1484 comm_mode, gb, gb_len);
1485 if (rc < 0) {
1486 nfc_dev_err(&dev->interface->dev,
1487 "Error when signaling target activation");
1488 return rc;
1489 }
1490
1491 dev->tgt_mode = 1;
1492 queue_work(dev->wq, &dev->tg_work);
1493
1494 return 0;
1495 }
1496
1497 static void pn533_listen_mode_timer(unsigned long data)
1498 {
1499 struct pn533 *dev = (struct pn533 *)data;
1500
1501 nfc_dev_dbg(&dev->interface->dev, "Listen mode timeout");
1502
1503 /* An ack will cancel the last issued command (poll) */
1504 pn533_send_ack(dev, GFP_ATOMIC);
1505
1506 dev->cancel_listen = 1;
1507
1508 pn533_poll_next_mod(dev);
1509
1510 queue_work(dev->wq, &dev->poll_work);
1511 }
1512
1513 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1514 struct sk_buff *resp)
1515 {
1516 struct pn533_poll_modulations *cur_mod;
1517 int rc;
1518
1519 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1520
1521 if (IS_ERR(resp)) {
1522 rc = PTR_ERR(resp);
1523
1524 nfc_dev_err(&dev->interface->dev, "%s Poll complete error %d",
1525 __func__, rc);
1526
1527 if (rc == -ENOENT) {
1528 if (dev->poll_mod_count != 0)
1529 return rc;
1530 else
1531 goto stop_poll;
1532 } else if (rc < 0) {
1533 nfc_dev_err(&dev->interface->dev,
1534 "Error %d when running poll", rc);
1535 goto stop_poll;
1536 }
1537 }
1538
1539 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1540
1541 if (cur_mod->len == 0) { /* Target mode */
1542 del_timer(&dev->listen_timer);
1543 rc = pn533_init_target_complete(dev, resp);
1544 goto done;
1545 }
1546
1547 /* Initiator mode */
1548 rc = pn533_start_poll_complete(dev, resp);
1549 if (!rc)
1550 goto done;
1551
1552 pn533_poll_next_mod(dev);
1553 queue_work(dev->wq, &dev->poll_work);
1554
1555 done:
1556 dev_kfree_skb(resp);
1557 return rc;
1558
1559 stop_poll:
1560 nfc_dev_err(&dev->interface->dev, "Polling operation has been stopped");
1561
1562 pn533_poll_reset_mod_list(dev);
1563 dev->poll_protocols = 0;
1564 return rc;
1565 }
1566
1567 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1568 struct pn533_poll_modulations *mod)
1569 {
1570 struct sk_buff *skb;
1571
1572 skb = pn533_alloc_skb(dev, mod->len);
1573 if (!skb)
1574 return NULL;
1575
1576 memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
1577
1578 return skb;
1579 }
1580
1581 static int pn533_send_poll_frame(struct pn533 *dev)
1582 {
1583 struct pn533_poll_modulations *mod;
1584 struct sk_buff *skb;
1585 int rc;
1586 u8 cmd_code;
1587
1588 mod = dev->poll_mod_active[dev->poll_mod_curr];
1589
1590 nfc_dev_dbg(&dev->interface->dev, "%s mod len %d\n",
1591 __func__, mod->len);
1592
1593 if (mod->len == 0) { /* Listen mode */
1594 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1595 skb = pn533_alloc_poll_tg_frame(dev);
1596 } else { /* Polling mode */
1597 cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET;
1598 skb = pn533_alloc_poll_in_frame(dev, mod);
1599 }
1600
1601 if (!skb) {
1602 nfc_dev_err(&dev->interface->dev, "Failed to allocate skb.");
1603 return -ENOMEM;
1604 }
1605
1606 rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1607 NULL);
1608 if (rc < 0) {
1609 dev_kfree_skb(skb);
1610 nfc_dev_err(&dev->interface->dev, "Polling loop error %d", rc);
1611 }
1612
1613 return rc;
1614 }
1615
1616 static void pn533_wq_poll(struct work_struct *work)
1617 {
1618 struct pn533 *dev = container_of(work, struct pn533, poll_work);
1619 struct pn533_poll_modulations *cur_mod;
1620 int rc;
1621
1622 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1623
1624 nfc_dev_dbg(&dev->interface->dev,
1625 "%s cancel_listen %d modulation len %d",
1626 __func__, dev->cancel_listen, cur_mod->len);
1627
1628 if (dev->cancel_listen == 1) {
1629 dev->cancel_listen = 0;
1630 usb_kill_urb(dev->in_urb);
1631 }
1632
1633 rc = pn533_send_poll_frame(dev);
1634 if (rc)
1635 return;
1636
1637 if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1638 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1639
1640 return;
1641 }
1642
1643 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1644 u32 im_protocols, u32 tm_protocols)
1645 {
1646 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1647
1648 nfc_dev_dbg(&dev->interface->dev,
1649 "%s: im protocols 0x%x tm protocols 0x%x",
1650 __func__, im_protocols, tm_protocols);
1651
1652 if (dev->tgt_active_prot) {
1653 nfc_dev_err(&dev->interface->dev,
1654 "Cannot poll with a target already activated");
1655 return -EBUSY;
1656 }
1657
1658 if (dev->tgt_mode) {
1659 nfc_dev_err(&dev->interface->dev,
1660 "Cannot poll while already being activated");
1661 return -EBUSY;
1662 }
1663
1664 if (tm_protocols) {
1665 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1666 if (dev->gb == NULL)
1667 tm_protocols = 0;
1668 }
1669
1670 dev->poll_mod_curr = 0;
1671 pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1672 dev->poll_protocols = im_protocols;
1673 dev->listen_protocols = tm_protocols;
1674
1675 return pn533_send_poll_frame(dev);
1676 }
1677
1678 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1679 {
1680 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1681
1682 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1683
1684 del_timer(&dev->listen_timer);
1685
1686 if (!dev->poll_mod_count) {
1687 nfc_dev_dbg(&dev->interface->dev,
1688 "Polling operation was not running");
1689 return;
1690 }
1691
1692 /* An ack will cancel the last issued command (poll) */
1693 pn533_send_ack(dev, GFP_KERNEL);
1694
1695 /* prevent pn533_start_poll_complete to issue a new poll meanwhile */
1696 usb_kill_urb(dev->in_urb);
1697
1698 pn533_poll_reset_mod_list(dev);
1699 }
1700
1701 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1702 {
1703 struct pn533_cmd_activate_response *rsp;
1704 u16 gt_len;
1705 int rc;
1706
1707 struct sk_buff *skb;
1708 struct sk_buff *resp;
1709
1710 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1711
1712 skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1713 if (!skb)
1714 return -ENOMEM;
1715
1716 *skb_put(skb, sizeof(u8)) = 1; /* TG */
1717 *skb_put(skb, sizeof(u8)) = 0; /* Next */
1718
1719 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1720 if (IS_ERR(resp))
1721 return PTR_ERR(resp);
1722
1723 rsp = (struct pn533_cmd_activate_response *)resp->data;
1724 rc = rsp->status & PN533_CMD_RET_MASK;
1725 if (rc != PN533_CMD_RET_SUCCESS) {
1726 dev_kfree_skb(resp);
1727 return -EIO;
1728 }
1729
1730 /* ATR_RES general bytes are located at offset 16 */
1731 gt_len = resp->len - 16;
1732 rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1733
1734 dev_kfree_skb(resp);
1735 return rc;
1736 }
1737
1738 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1739 struct nfc_target *target, u32 protocol)
1740 {
1741 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1742 int rc;
1743
1744 nfc_dev_dbg(&dev->interface->dev, "%s - protocol=%u", __func__,
1745 protocol);
1746
1747 if (dev->poll_mod_count) {
1748 nfc_dev_err(&dev->interface->dev,
1749 "Cannot activate while polling");
1750 return -EBUSY;
1751 }
1752
1753 if (dev->tgt_active_prot) {
1754 nfc_dev_err(&dev->interface->dev,
1755 "There is already an active target");
1756 return -EBUSY;
1757 }
1758
1759 if (!dev->tgt_available_prots) {
1760 nfc_dev_err(&dev->interface->dev,
1761 "There is no available target to activate");
1762 return -EINVAL;
1763 }
1764
1765 if (!(dev->tgt_available_prots & (1 << protocol))) {
1766 nfc_dev_err(&dev->interface->dev,
1767 "Target doesn't support requested proto %u",
1768 protocol);
1769 return -EINVAL;
1770 }
1771
1772 if (protocol == NFC_PROTO_NFC_DEP) {
1773 rc = pn533_activate_target_nfcdep(dev);
1774 if (rc) {
1775 nfc_dev_err(&dev->interface->dev,
1776 "Activating target with DEP failed %d", rc);
1777 return rc;
1778 }
1779 }
1780
1781 dev->tgt_active_prot = protocol;
1782 dev->tgt_available_prots = 0;
1783
1784 return 0;
1785 }
1786
1787 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1788 struct nfc_target *target)
1789 {
1790 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1791
1792 struct sk_buff *skb;
1793 struct sk_buff *resp;
1794
1795 int rc;
1796
1797 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1798
1799 if (!dev->tgt_active_prot) {
1800 nfc_dev_err(&dev->interface->dev, "There is no active target");
1801 return;
1802 }
1803
1804 dev->tgt_active_prot = 0;
1805 skb_queue_purge(&dev->resp_q);
1806
1807 skb = pn533_alloc_skb(dev, sizeof(u8));
1808 if (!skb)
1809 return;
1810
1811 *skb_put(skb, 1) = 1; /* TG*/
1812
1813 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_RELEASE, skb);
1814 if (IS_ERR(resp))
1815 return;
1816
1817 rc = resp->data[0] & PN533_CMD_RET_MASK;
1818 if (rc != PN533_CMD_RET_SUCCESS)
1819 nfc_dev_err(&dev->interface->dev,
1820 "Error 0x%x when releasing the target", rc);
1821
1822 dev_kfree_skb(resp);
1823 return;
1824 }
1825
1826
1827 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1828 struct sk_buff *resp)
1829 {
1830 struct pn533_cmd_jump_dep_response *rsp;
1831 u8 target_gt_len;
1832 int rc;
1833 u8 active = *(u8 *)arg;
1834
1835 kfree(arg);
1836
1837 if (IS_ERR(resp))
1838 return PTR_ERR(resp);
1839
1840 if (dev->tgt_available_prots &&
1841 !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1842 nfc_dev_err(&dev->interface->dev,
1843 "The target does not support DEP");
1844 rc = -EINVAL;
1845 goto error;
1846 }
1847
1848 rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1849
1850 rc = rsp->status & PN533_CMD_RET_MASK;
1851 if (rc != PN533_CMD_RET_SUCCESS) {
1852 nfc_dev_err(&dev->interface->dev,
1853 "Bringing DEP link up failed %d", rc);
1854 goto error;
1855 }
1856
1857 if (!dev->tgt_available_prots) {
1858 struct nfc_target nfc_target;
1859
1860 nfc_dev_dbg(&dev->interface->dev, "Creating new target");
1861
1862 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1863 nfc_target.nfcid1_len = 10;
1864 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1865 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1866 if (rc)
1867 goto error;
1868
1869 dev->tgt_available_prots = 0;
1870 }
1871
1872 dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1873
1874 /* ATR_RES general bytes are located at offset 17 */
1875 target_gt_len = resp->len - 17;
1876 rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1877 rsp->gt, target_gt_len);
1878 if (rc == 0)
1879 rc = nfc_dep_link_is_up(dev->nfc_dev,
1880 dev->nfc_dev->targets[0].idx,
1881 !active, NFC_RF_INITIATOR);
1882
1883 error:
1884 dev_kfree_skb(resp);
1885 return rc;
1886 }
1887
1888 static int pn533_mod_to_baud(struct pn533 *dev)
1889 {
1890 switch (dev->poll_mod_curr) {
1891 case PN533_POLL_MOD_106KBPS_A:
1892 return 0;
1893 case PN533_POLL_MOD_212KBPS_FELICA:
1894 return 1;
1895 case PN533_POLL_MOD_424KBPS_FELICA:
1896 return 2;
1897 default:
1898 return -EINVAL;
1899 }
1900 }
1901
1902 #define PASSIVE_DATA_LEN 5
1903 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1904 u8 comm_mode, u8 *gb, size_t gb_len)
1905 {
1906 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1907 struct sk_buff *skb;
1908 int rc, baud, skb_len;
1909 u8 *next, *arg;
1910
1911 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1912
1913 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1914
1915 if (dev->poll_mod_count) {
1916 nfc_dev_err(&dev->interface->dev,
1917 "Cannot bring the DEP link up while polling");
1918 return -EBUSY;
1919 }
1920
1921 if (dev->tgt_active_prot) {
1922 nfc_dev_err(&dev->interface->dev,
1923 "There is already an active target");
1924 return -EBUSY;
1925 }
1926
1927 baud = pn533_mod_to_baud(dev);
1928 if (baud < 0) {
1929 nfc_dev_err(&dev->interface->dev,
1930 "Invalid curr modulation %d", dev->poll_mod_curr);
1931 return baud;
1932 }
1933
1934 skb_len = 3 + gb_len; /* ActPass + BR + Next */
1935 if (comm_mode == NFC_COMM_PASSIVE)
1936 skb_len += PASSIVE_DATA_LEN;
1937
1938 skb = pn533_alloc_skb(dev, skb_len);
1939 if (!skb)
1940 return -ENOMEM;
1941
1942 *skb_put(skb, 1) = !comm_mode; /* ActPass */
1943 *skb_put(skb, 1) = baud; /* Baud rate */
1944
1945 next = skb_put(skb, 1); /* Next */
1946 *next = 0;
1947
1948 if (comm_mode == NFC_COMM_PASSIVE && baud > 0) {
1949 memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data,
1950 PASSIVE_DATA_LEN);
1951 *next |= 1;
1952 }
1953
1954 if (gb != NULL && gb_len > 0) {
1955 memcpy(skb_put(skb, gb_len), gb, gb_len);
1956 *next |= 4; /* We have some Gi */
1957 } else {
1958 *next = 0;
1959 }
1960
1961 arg = kmalloc(sizeof(*arg), GFP_KERNEL);
1962 if (!arg) {
1963 dev_kfree_skb(skb);
1964 return -ENOMEM;
1965 }
1966
1967 *arg = !comm_mode;
1968
1969 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1970 pn533_in_dep_link_up_complete, arg);
1971
1972 if (rc < 0) {
1973 dev_kfree_skb(skb);
1974 kfree(arg);
1975 }
1976
1977 return rc;
1978 }
1979
1980 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
1981 {
1982 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1983
1984 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1985
1986 pn533_poll_reset_mod_list(dev);
1987
1988 if (dev->tgt_mode || dev->tgt_active_prot) {
1989 pn533_send_ack(dev, GFP_KERNEL);
1990 usb_kill_urb(dev->in_urb);
1991 }
1992
1993 dev->tgt_active_prot = 0;
1994 dev->tgt_mode = 0;
1995
1996 skb_queue_purge(&dev->resp_q);
1997
1998 return 0;
1999 }
2000
2001 struct pn533_data_exchange_arg {
2002 data_exchange_cb_t cb;
2003 void *cb_context;
2004 };
2005
2006 static struct sk_buff *pn533_build_response(struct pn533 *dev)
2007 {
2008 struct sk_buff *skb, *tmp, *t;
2009 unsigned int skb_len = 0, tmp_len = 0;
2010
2011 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2012
2013 if (skb_queue_empty(&dev->resp_q))
2014 return NULL;
2015
2016 if (skb_queue_len(&dev->resp_q) == 1) {
2017 skb = skb_dequeue(&dev->resp_q);
2018 goto out;
2019 }
2020
2021 skb_queue_walk_safe(&dev->resp_q, tmp, t)
2022 skb_len += tmp->len;
2023
2024 nfc_dev_dbg(&dev->interface->dev, "%s total length %d\n",
2025 __func__, skb_len);
2026
2027 skb = alloc_skb(skb_len, GFP_KERNEL);
2028 if (skb == NULL)
2029 goto out;
2030
2031 skb_put(skb, skb_len);
2032
2033 skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2034 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2035 tmp_len += tmp->len;
2036 }
2037
2038 out:
2039 skb_queue_purge(&dev->resp_q);
2040
2041 return skb;
2042 }
2043
2044 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2045 struct sk_buff *resp)
2046 {
2047 struct pn533_data_exchange_arg *arg = _arg;
2048 struct sk_buff *skb;
2049 int rc = 0;
2050 u8 status, ret, mi;
2051
2052 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2053
2054 if (IS_ERR(resp)) {
2055 rc = PTR_ERR(resp);
2056 goto _error;
2057 }
2058
2059 status = resp->data[0];
2060 ret = status & PN533_CMD_RET_MASK;
2061 mi = status & PN533_CMD_MI_MASK;
2062
2063 skb_pull(resp, sizeof(status));
2064
2065 if (ret != PN533_CMD_RET_SUCCESS) {
2066 nfc_dev_err(&dev->interface->dev,
2067 "PN533 reported error %d when exchanging data",
2068 ret);
2069 rc = -EIO;
2070 goto error;
2071 }
2072
2073 skb_queue_tail(&dev->resp_q, resp);
2074
2075 if (mi) {
2076 dev->cmd_complete_mi_arg = arg;
2077 queue_work(dev->wq, &dev->mi_work);
2078 return -EINPROGRESS;
2079 }
2080
2081 skb = pn533_build_response(dev);
2082 if (!skb)
2083 goto error;
2084
2085 arg->cb(arg->cb_context, skb, 0);
2086 kfree(arg);
2087 return 0;
2088
2089 error:
2090 dev_kfree_skb(resp);
2091 _error:
2092 skb_queue_purge(&dev->resp_q);
2093 arg->cb(arg->cb_context, NULL, rc);
2094 kfree(arg);
2095 return rc;
2096 }
2097
2098 static int pn533_transceive(struct nfc_dev *nfc_dev,
2099 struct nfc_target *target, struct sk_buff *skb,
2100 data_exchange_cb_t cb, void *cb_context)
2101 {
2102 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2103 struct pn533_data_exchange_arg *arg = NULL;
2104 int rc;
2105
2106 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2107
2108 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2109 /* TODO: Implement support to multi-part data exchange */
2110 nfc_dev_err(&dev->interface->dev,
2111 "Data length greater than the max allowed: %d",
2112 PN533_CMD_DATAEXCH_DATA_MAXLEN);
2113 rc = -ENOSYS;
2114 goto error;
2115 }
2116
2117 if (!dev->tgt_active_prot) {
2118 nfc_dev_err(&dev->interface->dev,
2119 "Can't exchange data if there is no active target");
2120 rc = -EINVAL;
2121 goto error;
2122 }
2123
2124 arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2125 if (!arg) {
2126 rc = -ENOMEM;
2127 goto error;
2128 }
2129
2130 arg->cb = cb;
2131 arg->cb_context = cb_context;
2132
2133 switch (dev->device_type) {
2134 case PN533_DEVICE_PASORI:
2135 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2136 rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2137 skb,
2138 pn533_data_exchange_complete,
2139 arg);
2140
2141 break;
2142 }
2143 default:
2144 *skb_push(skb, sizeof(u8)) = 1; /*TG*/
2145
2146 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2147 skb, pn533_data_exchange_complete,
2148 arg);
2149
2150 break;
2151 }
2152
2153 if (rc < 0) /* rc from send_async */
2154 goto error;
2155
2156 return 0;
2157
2158 error:
2159 kfree(arg);
2160 dev_kfree_skb(skb);
2161 return rc;
2162 }
2163
2164 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2165 struct sk_buff *resp)
2166 {
2167 u8 status;
2168
2169 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2170
2171 if (IS_ERR(resp))
2172 return PTR_ERR(resp);
2173
2174 status = resp->data[0];
2175
2176 dev_kfree_skb(resp);
2177
2178 if (status != 0) {
2179 nfc_tm_deactivated(dev->nfc_dev);
2180
2181 dev->tgt_mode = 0;
2182
2183 return 0;
2184 }
2185
2186 queue_work(dev->wq, &dev->tg_work);
2187
2188 return 0;
2189 }
2190
2191 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2192 {
2193 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2194 int rc;
2195
2196 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2197
2198 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2199 nfc_dev_err(&dev->interface->dev,
2200 "Data length greater than the max allowed: %d",
2201 PN533_CMD_DATAEXCH_DATA_MAXLEN);
2202 return -ENOSYS;
2203 }
2204
2205 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2206 pn533_tm_send_complete, NULL);
2207 if (rc < 0)
2208 dev_kfree_skb(skb);
2209
2210 return rc;
2211 }
2212
2213 static void pn533_wq_mi_recv(struct work_struct *work)
2214 {
2215 struct pn533 *dev = container_of(work, struct pn533, mi_work);
2216
2217 struct sk_buff *skb;
2218 int rc;
2219
2220 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2221
2222 skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2223 if (!skb)
2224 goto error;
2225
2226 switch (dev->device_type) {
2227 case PN533_DEVICE_PASORI:
2228 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2229 rc = pn533_send_cmd_direct_async(dev,
2230 PN533_CMD_IN_COMM_THRU,
2231 skb,
2232 pn533_data_exchange_complete,
2233 dev->cmd_complete_mi_arg);
2234
2235 break;
2236 }
2237 default:
2238 *skb_put(skb, sizeof(u8)) = 1; /*TG*/
2239
2240 rc = pn533_send_cmd_direct_async(dev,
2241 PN533_CMD_IN_DATA_EXCHANGE,
2242 skb,
2243 pn533_data_exchange_complete,
2244 dev->cmd_complete_mi_arg);
2245
2246 break;
2247 }
2248
2249 if (rc == 0) /* success */
2250 return;
2251
2252 nfc_dev_err(&dev->interface->dev,
2253 "Error %d when trying to perform data_exchange", rc);
2254
2255 dev_kfree_skb(skb);
2256 kfree(dev->cmd_complete_arg);
2257
2258 error:
2259 pn533_send_ack(dev, GFP_KERNEL);
2260 queue_work(dev->wq, &dev->cmd_work);
2261 }
2262
2263 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2264 u8 cfgdata_len)
2265 {
2266 struct sk_buff *skb;
2267 struct sk_buff *resp;
2268
2269 int skb_len;
2270
2271 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2272
2273 skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2274
2275 skb = pn533_alloc_skb(dev, skb_len);
2276 if (!skb)
2277 return -ENOMEM;
2278
2279 *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2280 memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2281
2282 resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2283 if (IS_ERR(resp))
2284 return PTR_ERR(resp);
2285
2286 dev_kfree_skb(resp);
2287 return 0;
2288 }
2289
2290 static int pn533_get_firmware_version(struct pn533 *dev,
2291 struct pn533_fw_version *fv)
2292 {
2293 struct sk_buff *skb;
2294 struct sk_buff *resp;
2295
2296 skb = pn533_alloc_skb(dev, 0);
2297 if (!skb)
2298 return -ENOMEM;
2299
2300 resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2301 if (IS_ERR(resp))
2302 return PTR_ERR(resp);
2303
2304 fv->ic = resp->data[0];
2305 fv->ver = resp->data[1];
2306 fv->rev = resp->data[2];
2307 fv->support = resp->data[3];
2308
2309 dev_kfree_skb(resp);
2310 return 0;
2311 }
2312
2313 static int pn533_fw_reset(struct pn533 *dev)
2314 {
2315 struct sk_buff *skb;
2316 struct sk_buff *resp;
2317
2318 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2319
2320 skb = pn533_alloc_skb(dev, sizeof(u8));
2321 if (!skb)
2322 return -ENOMEM;
2323
2324 *skb_put(skb, sizeof(u8)) = 0x1;
2325
2326 resp = pn533_send_cmd_sync(dev, 0x18, skb);
2327 if (IS_ERR(resp))
2328 return PTR_ERR(resp);
2329
2330 dev_kfree_skb(resp);
2331
2332 return 0;
2333 }
2334
2335 static struct nfc_ops pn533_nfc_ops = {
2336 .dev_up = NULL,
2337 .dev_down = NULL,
2338 .dep_link_up = pn533_dep_link_up,
2339 .dep_link_down = pn533_dep_link_down,
2340 .start_poll = pn533_start_poll,
2341 .stop_poll = pn533_stop_poll,
2342 .activate_target = pn533_activate_target,
2343 .deactivate_target = pn533_deactivate_target,
2344 .im_transceive = pn533_transceive,
2345 .tm_send = pn533_tm_send,
2346 };
2347
2348 static int pn533_setup(struct pn533 *dev)
2349 {
2350 struct pn533_config_max_retries max_retries;
2351 struct pn533_config_timing timing;
2352 u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2353 int rc;
2354
2355 switch (dev->device_type) {
2356 case PN533_DEVICE_STD:
2357 max_retries.mx_rty_atr = PN533_CONFIG_MAX_RETRIES_ENDLESS;
2358 max_retries.mx_rty_psl = 2;
2359 max_retries.mx_rty_passive_act =
2360 PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2361
2362 timing.rfu = PN533_CONFIG_TIMING_102;
2363 timing.atr_res_timeout = PN533_CONFIG_TIMING_204;
2364 timing.dep_timeout = PN533_CONFIG_TIMING_409;
2365
2366 break;
2367
2368 case PN533_DEVICE_PASORI:
2369 max_retries.mx_rty_atr = 0x2;
2370 max_retries.mx_rty_psl = 0x1;
2371 max_retries.mx_rty_passive_act =
2372 PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2373
2374 timing.rfu = PN533_CONFIG_TIMING_102;
2375 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2376 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2377
2378 break;
2379
2380 default:
2381 nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2382 dev->device_type);
2383 return -EINVAL;
2384 }
2385
2386 rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2387 (u8 *)&max_retries, sizeof(max_retries));
2388 if (rc) {
2389 nfc_dev_err(&dev->interface->dev,
2390 "Error on setting MAX_RETRIES config");
2391 return rc;
2392 }
2393
2394
2395 rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2396 (u8 *)&timing, sizeof(timing));
2397 if (rc) {
2398 nfc_dev_err(&dev->interface->dev,
2399 "Error on setting RF timings");
2400 return rc;
2401 }
2402
2403 switch (dev->device_type) {
2404 case PN533_DEVICE_STD:
2405 break;
2406
2407 case PN533_DEVICE_PASORI:
2408 pn533_fw_reset(dev);
2409
2410 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2411 pasori_cfg, 3);
2412 if (rc) {
2413 nfc_dev_err(&dev->interface->dev,
2414 "Error while settings PASORI config");
2415 return rc;
2416 }
2417
2418 pn533_fw_reset(dev);
2419
2420 break;
2421 }
2422
2423 return 0;
2424 }
2425
2426 static int pn533_probe(struct usb_interface *interface,
2427 const struct usb_device_id *id)
2428 {
2429 struct pn533_fw_version fw_ver;
2430 struct pn533 *dev;
2431 struct usb_host_interface *iface_desc;
2432 struct usb_endpoint_descriptor *endpoint;
2433 int in_endpoint = 0;
2434 int out_endpoint = 0;
2435 int rc = -ENOMEM;
2436 int i;
2437 u32 protocols;
2438
2439 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2440 if (!dev)
2441 return -ENOMEM;
2442
2443 dev->udev = usb_get_dev(interface_to_usbdev(interface));
2444 dev->interface = interface;
2445 mutex_init(&dev->cmd_lock);
2446
2447 iface_desc = interface->cur_altsetting;
2448 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
2449 endpoint = &iface_desc->endpoint[i].desc;
2450
2451 if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
2452 in_endpoint = endpoint->bEndpointAddress;
2453
2454 if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
2455 out_endpoint = endpoint->bEndpointAddress;
2456 }
2457
2458 if (!in_endpoint || !out_endpoint) {
2459 nfc_dev_err(&interface->dev,
2460 "Could not find bulk-in or bulk-out endpoint");
2461 rc = -ENODEV;
2462 goto error;
2463 }
2464
2465 dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
2466 dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
2467
2468 if (!dev->in_urb || !dev->out_urb)
2469 goto error;
2470
2471 usb_fill_bulk_urb(dev->in_urb, dev->udev,
2472 usb_rcvbulkpipe(dev->udev, in_endpoint),
2473 NULL, 0, NULL, dev);
2474 usb_fill_bulk_urb(dev->out_urb, dev->udev,
2475 usb_sndbulkpipe(dev->udev, out_endpoint),
2476 NULL, 0, pn533_send_complete, dev);
2477
2478 INIT_WORK(&dev->cmd_work, pn533_wq_cmd);
2479 INIT_WORK(&dev->cmd_complete_work, pn533_wq_cmd_complete);
2480 INIT_WORK(&dev->mi_work, pn533_wq_mi_recv);
2481 INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
2482 INIT_WORK(&dev->poll_work, pn533_wq_poll);
2483 dev->wq = alloc_ordered_workqueue("pn533", 0);
2484 if (dev->wq == NULL)
2485 goto error;
2486
2487 init_timer(&dev->listen_timer);
2488 dev->listen_timer.data = (unsigned long) dev;
2489 dev->listen_timer.function = pn533_listen_mode_timer;
2490
2491 skb_queue_head_init(&dev->resp_q);
2492
2493 INIT_LIST_HEAD(&dev->cmd_queue);
2494
2495 usb_set_intfdata(interface, dev);
2496
2497 dev->ops = &pn533_std_frame_ops;
2498
2499 dev->device_type = id->driver_info;
2500 switch (dev->device_type) {
2501 case PN533_DEVICE_STD:
2502 protocols = PN533_ALL_PROTOCOLS;
2503 break;
2504
2505 case PN533_DEVICE_PASORI:
2506 protocols = PN533_NO_TYPE_B_PROTOCOLS;
2507 break;
2508
2509 default:
2510 nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2511 dev->device_type);
2512 rc = -EINVAL;
2513 goto destroy_wq;
2514 }
2515
2516 memset(&fw_ver, 0, sizeof(fw_ver));
2517 rc = pn533_get_firmware_version(dev, &fw_ver);
2518 if (rc < 0)
2519 goto destroy_wq;
2520
2521 nfc_dev_info(&dev->interface->dev,
2522 "NXP PN533 firmware ver %d.%d now attached",
2523 fw_ver.ver, fw_ver.rev);
2524
2525
2526 dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2527 NFC_SE_NONE,
2528 dev->ops->tx_header_len +
2529 PN533_CMD_DATAEXCH_HEAD_LEN,
2530 dev->ops->tx_tail_len);
2531 if (!dev->nfc_dev)
2532 goto destroy_wq;
2533
2534 nfc_set_parent_dev(dev->nfc_dev, &interface->dev);
2535 nfc_set_drvdata(dev->nfc_dev, dev);
2536
2537 rc = nfc_register_device(dev->nfc_dev);
2538 if (rc)
2539 goto free_nfc_dev;
2540
2541 rc = pn533_setup(dev);
2542 if (rc)
2543 goto unregister_nfc_dev;
2544
2545 return 0;
2546
2547 unregister_nfc_dev:
2548 nfc_unregister_device(dev->nfc_dev);
2549
2550 free_nfc_dev:
2551 nfc_free_device(dev->nfc_dev);
2552
2553 destroy_wq:
2554 destroy_workqueue(dev->wq);
2555 error:
2556 usb_free_urb(dev->in_urb);
2557 usb_free_urb(dev->out_urb);
2558 kfree(dev);
2559 return rc;
2560 }
2561
2562 static void pn533_disconnect(struct usb_interface *interface)
2563 {
2564 struct pn533 *dev;
2565 struct pn533_cmd *cmd, *n;
2566
2567 dev = usb_get_intfdata(interface);
2568 usb_set_intfdata(interface, NULL);
2569
2570 nfc_unregister_device(dev->nfc_dev);
2571 nfc_free_device(dev->nfc_dev);
2572
2573 usb_kill_urb(dev->in_urb);
2574 usb_kill_urb(dev->out_urb);
2575
2576 destroy_workqueue(dev->wq);
2577
2578 skb_queue_purge(&dev->resp_q);
2579
2580 del_timer(&dev->listen_timer);
2581
2582 list_for_each_entry_safe(cmd, n, &dev->cmd_queue, queue) {
2583 list_del(&cmd->queue);
2584 kfree(cmd);
2585 }
2586
2587 usb_free_urb(dev->in_urb);
2588 usb_free_urb(dev->out_urb);
2589 kfree(dev);
2590
2591 nfc_dev_info(&interface->dev, "NXP PN533 NFC device disconnected");
2592 }
2593
2594 static struct usb_driver pn533_driver = {
2595 .name = "pn533",
2596 .probe = pn533_probe,
2597 .disconnect = pn533_disconnect,
2598 .id_table = pn533_table,
2599 };
2600
2601 module_usb_driver(pn533_driver);
2602
2603 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>,"
2604 " Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2605 MODULE_DESCRIPTION("PN533 usb driver ver " VERSION);
2606 MODULE_VERSION(VERSION);
2607 MODULE_LICENSE("GPL");
Linus' kernel tree