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NFC: pn533: Fix minor style issues
[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 struct pn533_frame *in_frame;
333
334 struct sk_buff_head resp_q;
335
336 struct workqueue_struct *wq;
337 struct work_struct cmd_work;
338 struct work_struct cmd_complete_work;
339 struct work_struct poll_work;
340 struct work_struct mi_work;
341 struct work_struct tg_work;
342 struct timer_list listen_timer;
343 struct pn533_frame *wq_in_frame;
344 int wq_in_error;
345 int cancel_listen;
346
347 pn533_cmd_complete_t cmd_complete;
348 void *cmd_complete_arg;
349 void *cmd_complete_mi_arg;
350 struct mutex cmd_lock;
351 u8 cmd;
352
353 struct pn533_poll_modulations *poll_mod_active[PN533_POLL_MOD_MAX + 1];
354 u8 poll_mod_count;
355 u8 poll_mod_curr;
356 u32 poll_protocols;
357 u32 listen_protocols;
358
359 u8 *gb;
360 size_t gb_len;
361
362 u8 tgt_available_prots;
363 u8 tgt_active_prot;
364 u8 tgt_mode;
365
366 u32 device_type;
367
368 struct list_head cmd_queue;
369 u8 cmd_pending;
370 };
371
372 struct pn533_cmd {
373 struct list_head queue;
374 struct pn533_frame *out_frame;
375 struct pn533_frame *in_frame;
376 int in_frame_len;
377 u8 cmd_code;
378 struct sk_buff *req;
379 struct sk_buff *resp;
380 pn533_cmd_complete_t cmd_complete;
381 void *arg;
382 };
383
384 struct pn533_frame {
385 u8 preamble;
386 __be16 start_frame;
387 u8 datalen;
388 u8 datalen_checksum;
389 u8 data[];
390 } __packed;
391
392 /* The rule: value + checksum = 0 */
393 static inline u8 pn533_checksum(u8 value)
394 {
395 return ~value + 1;
396 }
397
398 /* The rule: sum(data elements) + checksum = 0 */
399 static u8 pn533_data_checksum(u8 *data, int datalen)
400 {
401 u8 sum = 0;
402 int i;
403
404 for (i = 0; i < datalen; i++)
405 sum += data[i];
406
407 return pn533_checksum(sum);
408 }
409
410 /**
411 * pn533_tx_frame_ack - create a ack frame
412 * @frame: The frame to be set as ack
413 *
414 * Ack is different type of standard frame. As a standard frame, it has
415 * preamble and start_frame. However the checksum of this frame must fail,
416 * i.e. datalen + datalen_checksum must NOT be zero. When the checksum test
417 * fails and datalen = 0 and datalen_checksum = 0xFF, the frame is a ack.
418 * After datalen_checksum field, the postamble is placed.
419 */
420 static void pn533_tx_frame_ack(struct pn533_frame *frame)
421 {
422 frame->preamble = 0;
423 frame->start_frame = cpu_to_be16(PN533_SOF);
424 frame->datalen = 0;
425 frame->datalen_checksum = 0xFF;
426 /* data[0] is used as postamble */
427 frame->data[0] = 0;
428 }
429
430 static void pn533_tx_frame_init(struct pn533_frame *frame, u8 cmd)
431 {
432 frame->preamble = 0;
433 frame->start_frame = cpu_to_be16(PN533_SOF);
434 PN533_FRAME_IDENTIFIER(frame) = PN533_DIR_OUT;
435 PN533_FRAME_CMD(frame) = cmd;
436 frame->datalen = 2;
437 }
438
439 static void pn533_tx_frame_finish(struct pn533_frame *frame)
440 {
441 frame->datalen_checksum = pn533_checksum(frame->datalen);
442
443 PN533_FRAME_CHECKSUM(frame) =
444 pn533_data_checksum(frame->data, frame->datalen);
445
446 PN533_FRAME_POSTAMBLE(frame) = 0;
447 }
448
449 static bool pn533_rx_frame_is_valid(struct pn533_frame *frame)
450 {
451 u8 checksum;
452
453 if (frame->start_frame != cpu_to_be16(PN533_SOF))
454 return false;
455
456 checksum = pn533_checksum(frame->datalen);
457 if (checksum != frame->datalen_checksum)
458 return false;
459
460 checksum = pn533_data_checksum(frame->data, frame->datalen);
461 if (checksum != PN533_FRAME_CHECKSUM(frame))
462 return false;
463
464 return true;
465 }
466
467 static bool pn533_rx_frame_is_ack(struct pn533_frame *frame)
468 {
469 if (frame->start_frame != cpu_to_be16(PN533_SOF))
470 return false;
471
472 if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
473 return false;
474
475 return true;
476 }
477
478 static bool pn533_rx_frame_is_cmd_response(struct pn533_frame *frame, u8 cmd)
479 {
480 return (PN533_FRAME_CMD(frame) == PN533_CMD_RESPONSE(cmd));
481 }
482
483
484 static void pn533_wq_cmd_complete(struct work_struct *work)
485 {
486 struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
487 struct pn533_frame *in_frame;
488 int rc;
489
490 in_frame = dev->wq_in_frame;
491
492 if (dev->wq_in_error)
493 rc = dev->cmd_complete(dev, dev->cmd_complete_arg, NULL,
494 dev->wq_in_error);
495 else
496 rc = dev->cmd_complete(dev, dev->cmd_complete_arg,
497 PN533_FRAME_CMD_PARAMS_PTR(in_frame),
498 PN533_FRAME_CMD_PARAMS_LEN(in_frame));
499
500 if (rc != -EINPROGRESS)
501 queue_work(dev->wq, &dev->cmd_work);
502 }
503
504 static void pn533_recv_response(struct urb *urb)
505 {
506 struct pn533 *dev = urb->context;
507 struct pn533_frame *in_frame;
508
509 dev->wq_in_frame = NULL;
510
511 switch (urb->status) {
512 case 0:
513 /* success */
514 break;
515 case -ECONNRESET:
516 case -ENOENT:
517 case -ESHUTDOWN:
518 nfc_dev_dbg(&dev->interface->dev,
519 "Urb shutting down with status: %d", urb->status);
520 dev->wq_in_error = urb->status;
521 goto sched_wq;
522 default:
523 nfc_dev_err(&dev->interface->dev,
524 "Nonzero urb status received: %d", urb->status);
525 dev->wq_in_error = urb->status;
526 goto sched_wq;
527 }
528
529 in_frame = dev->in_urb->transfer_buffer;
530
531 print_hex_dump(KERN_DEBUG, "PN533 RX: ", DUMP_PREFIX_NONE, 16, 1,
532 in_frame, PN533_FRAME_SIZE(in_frame), false);
533
534 if (!pn533_rx_frame_is_valid(in_frame)) {
535 nfc_dev_err(&dev->interface->dev, "Received an invalid frame");
536 dev->wq_in_error = -EIO;
537 goto sched_wq;
538 }
539
540 if (!pn533_rx_frame_is_cmd_response(in_frame, dev->cmd)) {
541 nfc_dev_err(&dev->interface->dev,
542 "It it not the response to the last command");
543 dev->wq_in_error = -EIO;
544 goto sched_wq;
545 }
546
547 nfc_dev_dbg(&dev->interface->dev, "Received a valid frame");
548 dev->wq_in_error = 0;
549 dev->wq_in_frame = in_frame;
550
551 sched_wq:
552 queue_work(dev->wq, &dev->cmd_complete_work);
553 }
554
555 static int pn533_submit_urb_for_response(struct pn533 *dev, gfp_t flags)
556 {
557 dev->in_urb->complete = pn533_recv_response;
558
559 return usb_submit_urb(dev->in_urb, flags);
560 }
561
562 static void pn533_recv_ack(struct urb *urb)
563 {
564 struct pn533 *dev = urb->context;
565 struct pn533_frame *in_frame;
566 int rc;
567
568 switch (urb->status) {
569 case 0:
570 /* success */
571 break;
572 case -ECONNRESET:
573 case -ENOENT:
574 case -ESHUTDOWN:
575 nfc_dev_dbg(&dev->interface->dev,
576 "Urb shutting down with status: %d", urb->status);
577 dev->wq_in_error = urb->status;
578 goto sched_wq;
579 default:
580 nfc_dev_err(&dev->interface->dev,
581 "Nonzero urb status received: %d", urb->status);
582 dev->wq_in_error = urb->status;
583 goto sched_wq;
584 }
585
586 in_frame = dev->in_urb->transfer_buffer;
587
588 if (!pn533_rx_frame_is_ack(in_frame)) {
589 nfc_dev_err(&dev->interface->dev, "Received an invalid ack");
590 dev->wq_in_error = -EIO;
591 goto sched_wq;
592 }
593
594 nfc_dev_dbg(&dev->interface->dev, "Received a valid ack");
595
596 rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
597 if (rc) {
598 nfc_dev_err(&dev->interface->dev,
599 "usb_submit_urb failed with result %d", rc);
600 dev->wq_in_error = rc;
601 goto sched_wq;
602 }
603
604 return;
605
606 sched_wq:
607 dev->wq_in_frame = NULL;
608 queue_work(dev->wq, &dev->cmd_complete_work);
609 }
610
611 static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags)
612 {
613 dev->in_urb->complete = pn533_recv_ack;
614
615 return usb_submit_urb(dev->in_urb, flags);
616 }
617
618 static int pn533_send_ack(struct pn533 *dev, gfp_t flags)
619 {
620 int rc;
621
622 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
623
624 pn533_tx_frame_ack(dev->out_frame);
625
626 dev->out_urb->transfer_buffer = dev->out_frame;
627 dev->out_urb->transfer_buffer_length = PN533_FRAME_ACK_SIZE;
628 rc = usb_submit_urb(dev->out_urb, flags);
629
630 return rc;
631 }
632
633 static int __pn533_send_cmd_frame_async(struct pn533 *dev,
634 struct pn533_frame *out_frame,
635 struct pn533_frame *in_frame,
636 int in_frame_len,
637 pn533_cmd_complete_t cmd_complete,
638 void *arg)
639 {
640 int rc;
641
642 nfc_dev_dbg(&dev->interface->dev, "Sending command 0x%x",
643 PN533_FRAME_CMD(out_frame));
644
645 dev->cmd = PN533_FRAME_CMD(out_frame);
646 dev->cmd_complete = cmd_complete;
647 dev->cmd_complete_arg = arg;
648
649 dev->out_urb->transfer_buffer = out_frame;
650 dev->out_urb->transfer_buffer_length =
651 PN533_FRAME_SIZE(out_frame);
652
653 dev->in_urb->transfer_buffer = in_frame;
654 dev->in_urb->transfer_buffer_length = in_frame_len;
655
656 print_hex_dump(KERN_DEBUG, "PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
657 out_frame, PN533_FRAME_SIZE(out_frame), false);
658
659 rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
660 if (rc)
661 return rc;
662
663 rc = pn533_submit_urb_for_ack(dev, GFP_KERNEL);
664 if (rc)
665 goto error;
666
667 return 0;
668
669 error:
670 usb_unlink_urb(dev->out_urb);
671 return rc;
672 }
673
674 static void pn533_build_cmd_frame(u8 cmd_code, struct sk_buff *skb)
675 {
676 struct pn533_frame *frame;
677 /* payload is already there, just update datalen */
678 int payload_len = skb->len;
679
680 skb_push(skb, PN533_FRAME_HEADER_LEN);
681 skb_put(skb, PN533_FRAME_TAIL_LEN);
682
683 frame = (struct pn533_frame *)skb->data;
684
685 pn533_tx_frame_init(frame, cmd_code);
686 frame->datalen += payload_len;
687 pn533_tx_frame_finish(frame);
688 }
689
690 struct pn533_send_async_complete_arg {
691 pn533_send_async_complete_t complete_cb;
692 void *complete_cb_context;
693 struct sk_buff *resp;
694 struct sk_buff *req;
695 };
696
697 static int pn533_send_async_complete(struct pn533 *dev, void *_arg, u8 *params,
698 int params_len)
699 {
700 struct pn533_send_async_complete_arg *arg = _arg;
701
702 struct sk_buff *req = arg->req;
703 struct sk_buff *resp = arg->resp;
704
705 struct pn533_frame *frame = (struct pn533_frame *)resp->data;
706 int rc;
707
708 dev_kfree_skb(req);
709
710 if (params_len < 0) {
711 nfc_dev_err(&dev->interface->dev,
712 "Error %d when starting as a target",
713 params_len);
714
715 arg->complete_cb(dev, arg->complete_cb_context,
716 ERR_PTR(params_len));
717 rc = params_len;
718 dev_kfree_skb(resp);
719 goto out;
720 }
721
722 skb_put(resp, PN533_FRAME_SIZE(frame));
723 skb_pull(resp, PN533_FRAME_HEADER_LEN);
724 skb_trim(resp, resp->len - PN533_FRAME_TAIL_LEN);
725
726 rc = arg->complete_cb(dev, arg->complete_cb_context, resp);
727
728 out:
729 kfree(arg);
730 return rc;
731 }
732
733 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
734 struct sk_buff *req, struct sk_buff *resp,
735 int resp_len,
736 pn533_send_async_complete_t complete_cb,
737 void *complete_cb_context)
738 {
739 struct pn533_cmd *cmd;
740 struct pn533_send_async_complete_arg *arg;
741 int rc = 0;
742
743 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
744
745 arg = kzalloc(sizeof(arg), GFP_KERNEL);
746 if (!arg)
747 return -ENOMEM;
748
749 arg->complete_cb = complete_cb;
750 arg->complete_cb_context = complete_cb_context;
751 arg->resp = resp;
752 arg->req = req;
753
754 pn533_build_cmd_frame(cmd_code, req);
755
756 mutex_lock(&dev->cmd_lock);
757
758 if (!dev->cmd_pending) {
759 rc = __pn533_send_cmd_frame_async(dev,
760 (struct pn533_frame *)req->data,
761 (struct pn533_frame *)resp->data,
762 resp_len, pn533_send_async_complete,
763 arg);
764 if (rc)
765 goto error;
766
767 dev->cmd_pending = 1;
768 goto unlock;
769 }
770
771 nfc_dev_dbg(&dev->interface->dev, "%s Queueing command", __func__);
772
773 cmd = kzalloc(sizeof(struct pn533_cmd), GFP_KERNEL);
774 if (!cmd) {
775 rc = -ENOMEM;
776 goto error;
777 }
778
779 INIT_LIST_HEAD(&cmd->queue);
780 cmd->cmd_code = cmd_code;
781 cmd->req = req;
782 cmd->resp = resp;
783 cmd->arg = arg;
784
785 list_add_tail(&cmd->queue, &dev->cmd_queue);
786
787 goto unlock;
788
789 error:
790 kfree(arg);
791 unlock:
792 mutex_unlock(&dev->cmd_lock);
793 return rc;
794 }
795
796 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
797 struct sk_buff *req,
798 pn533_send_async_complete_t complete_cb,
799 void *complete_cb_context)
800 {
801 struct sk_buff *resp;
802 int rc;
803 int resp_len = PN533_FRAME_HEADER_LEN +
804 PN533_FRAME_MAX_PAYLOAD_LEN +
805 PN533_FRAME_TAIL_LEN;
806
807 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
808
809 resp = nfc_alloc_recv_skb(resp_len, GFP_KERNEL);
810 if (!resp)
811 return -ENOMEM;
812
813 rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
814 complete_cb_context);
815 if (rc)
816 dev_kfree_skb(resp);
817
818 return rc;
819 }
820
821 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
822 struct sk_buff *req,
823 pn533_send_async_complete_t complete_cb,
824 void *complete_cb_context)
825 {
826 struct sk_buff *resp;
827 int rc;
828
829 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
830
831 resp = alloc_skb(PN533_NORMAL_FRAME_MAX_LEN, GFP_KERNEL);
832 if (!resp)
833 return -ENOMEM;
834
835 rc = __pn533_send_async(dev, cmd_code, req, resp,
836 PN533_NORMAL_FRAME_MAX_LEN,
837 complete_cb, complete_cb_context);
838 if (rc)
839 dev_kfree_skb(resp);
840
841 return rc;
842 }
843
844 /*
845 * pn533_send_cmd_direct_async
846 *
847 * The function sends a piority cmd directly to the chip omiting the cmd
848 * queue. It's intended to be used by chaining mechanism of received responses
849 * where the host has to request every single chunk of data before scheduling
850 * next cmd from the queue.
851 */
852 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
853 struct sk_buff *req,
854 pn533_send_async_complete_t complete_cb,
855 void *complete_cb_context)
856 {
857 struct pn533_send_async_complete_arg *arg;
858 struct sk_buff *resp;
859 int rc;
860 int resp_len = PN533_FRAME_HEADER_LEN +
861 PN533_FRAME_MAX_PAYLOAD_LEN +
862 PN533_FRAME_TAIL_LEN;
863
864 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
865
866 resp = alloc_skb(resp_len, GFP_KERNEL);
867 if (!resp)
868 return -ENOMEM;
869
870 arg = kzalloc(sizeof(arg), GFP_KERNEL);
871 if (!arg) {
872 dev_kfree_skb(resp);
873 return -ENOMEM;
874 }
875
876 arg->complete_cb = complete_cb;
877 arg->complete_cb_context = complete_cb_context;
878 arg->resp = resp;
879 arg->req = req;
880
881 pn533_build_cmd_frame(cmd_code, req);
882
883 rc = __pn533_send_cmd_frame_async(dev, (struct pn533_frame *)req->data,
884 (struct pn533_frame *)resp->data,
885 resp_len, pn533_send_async_complete,
886 arg);
887 if (rc < 0) {
888 dev_kfree_skb(resp);
889 kfree(arg);
890 }
891
892 return rc;
893 }
894
895 static void pn533_wq_cmd(struct work_struct *work)
896 {
897 struct pn533 *dev = container_of(work, struct pn533, cmd_work);
898 struct pn533_cmd *cmd;
899
900 mutex_lock(&dev->cmd_lock);
901
902 if (list_empty(&dev->cmd_queue)) {
903 dev->cmd_pending = 0;
904 mutex_unlock(&dev->cmd_lock);
905 return;
906 }
907
908 cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
909
910 list_del(&cmd->queue);
911
912 mutex_unlock(&dev->cmd_lock);
913
914 if (cmd->cmd_code != PN533_CMD_UNDEF)
915 __pn533_send_cmd_frame_async(dev,
916 (struct pn533_frame *)cmd->req->data,
917 (struct pn533_frame *)cmd->resp->data,
918 PN533_NORMAL_FRAME_MAX_LEN,
919 pn533_send_async_complete,
920 cmd->arg);
921 else
922 __pn533_send_cmd_frame_async(dev, cmd->out_frame, cmd->in_frame,
923 cmd->in_frame_len,
924 cmd->cmd_complete, cmd->arg);
925
926 kfree(cmd);
927 }
928
929 static int pn533_send_cmd_frame_async(struct pn533 *dev,
930 struct pn533_frame *out_frame,
931 struct pn533_frame *in_frame,
932 int in_frame_len,
933 pn533_cmd_complete_t cmd_complete,
934 void *arg)
935 {
936 struct pn533_cmd *cmd;
937 int rc = 0;
938
939 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
940
941 mutex_lock(&dev->cmd_lock);
942
943 if (!dev->cmd_pending) {
944 rc = __pn533_send_cmd_frame_async(dev, out_frame, in_frame,
945 in_frame_len, cmd_complete,
946 arg);
947 if (!rc)
948 dev->cmd_pending = 1;
949
950 goto unlock;
951 }
952
953 nfc_dev_dbg(&dev->interface->dev, "%s Queueing command", __func__);
954
955 cmd = kzalloc(sizeof(struct pn533_cmd), GFP_KERNEL);
956 if (!cmd) {
957 rc = -ENOMEM;
958 goto unlock;
959 }
960
961 INIT_LIST_HEAD(&cmd->queue);
962 cmd->out_frame = out_frame;
963 cmd->in_frame = in_frame;
964 cmd->in_frame_len = in_frame_len;
965 cmd->cmd_code = PN533_CMD_UNDEF;
966 cmd->cmd_complete = cmd_complete;
967 cmd->arg = arg;
968
969 list_add_tail(&cmd->queue, &dev->cmd_queue);
970
971 unlock:
972 mutex_unlock(&dev->cmd_lock);
973
974 return rc;
975 }
976
977 struct pn533_sync_cmd_response {
978 struct sk_buff *resp;
979 struct completion done;
980 };
981
982 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
983 struct sk_buff *resp)
984 {
985 struct pn533_sync_cmd_response *arg = _arg;
986
987 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
988
989 arg->resp = resp;
990 complete(&arg->done);
991
992 return 0;
993 }
994
995 /* pn533_send_cmd_sync
996 *
997 * Please note the req parameter is freed inside the function to
998 * limit a number of return value interpretations by the caller.
999 *
1000 * 1. negative in case of error during TX path -> req should be freed
1001 *
1002 * 2. negative in case of error during RX path -> req should not be freed
1003 * as it's been already freed at the begining of RX path by
1004 * async_complete_cb.
1005 *
1006 * 3. valid pointer in case of succesfult RX path
1007 *
1008 * A caller has to check a return value with IS_ERR macro. If the test pass,
1009 * the returned pointer is valid.
1010 *
1011 * */
1012 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
1013 struct sk_buff *req)
1014 {
1015 int rc;
1016 struct pn533_sync_cmd_response arg;
1017
1018 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1019
1020 init_completion(&arg.done);
1021
1022 rc = pn533_send_cmd_async(dev, cmd_code, req,
1023 pn533_send_sync_complete, &arg);
1024 if (rc) {
1025 dev_kfree_skb(req);
1026 return ERR_PTR(rc);
1027 }
1028
1029 wait_for_completion(&arg.done);
1030
1031 return arg.resp;
1032 }
1033
1034 static void pn533_send_complete(struct urb *urb)
1035 {
1036 struct pn533 *dev = urb->context;
1037
1038 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1039
1040 switch (urb->status) {
1041 case 0:
1042 /* success */
1043 break;
1044 case -ECONNRESET:
1045 case -ENOENT:
1046 case -ESHUTDOWN:
1047 nfc_dev_dbg(&dev->interface->dev,
1048 "Urb shutting down with status: %d", urb->status);
1049 break;
1050 default:
1051 nfc_dev_dbg(&dev->interface->dev,
1052 "Nonzero urb status received: %d", urb->status);
1053 }
1054 }
1055
1056 static struct sk_buff *pn533_alloc_skb(unsigned int size)
1057 {
1058 struct sk_buff *skb;
1059
1060 skb = alloc_skb(PN533_FRAME_HEADER_LEN +
1061 size +
1062 PN533_FRAME_TAIL_LEN, GFP_KERNEL);
1063
1064 if (skb)
1065 skb_reserve(skb, PN533_FRAME_HEADER_LEN);
1066
1067 return skb;
1068 }
1069
1070 struct pn533_target_type_a {
1071 __be16 sens_res;
1072 u8 sel_res;
1073 u8 nfcid_len;
1074 u8 nfcid_data[];
1075 } __packed;
1076
1077
1078 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
1079 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
1080 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
1081
1082 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
1083 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
1084
1085 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
1086 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
1087
1088 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
1089 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
1090 #define PN533_TYPE_A_SEL_PROT_DEP 2
1091 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
1092
1093 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
1094 int target_data_len)
1095 {
1096 u8 ssd;
1097 u8 platconf;
1098
1099 if (target_data_len < sizeof(struct pn533_target_type_a))
1100 return false;
1101
1102 /* The lenght check of nfcid[] and ats[] are not being performed because
1103 the values are not being used */
1104
1105 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1106 ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
1107 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
1108
1109 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1110 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1111 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1112 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1113 return false;
1114
1115 /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
1116 if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
1117 return false;
1118
1119 return true;
1120 }
1121
1122 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
1123 int tgt_data_len)
1124 {
1125 struct pn533_target_type_a *tgt_type_a;
1126
1127 tgt_type_a = (struct pn533_target_type_a *)tgt_data;
1128
1129 if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
1130 return -EPROTO;
1131
1132 switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
1133 case PN533_TYPE_A_SEL_PROT_MIFARE:
1134 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
1135 break;
1136 case PN533_TYPE_A_SEL_PROT_ISO14443:
1137 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
1138 break;
1139 case PN533_TYPE_A_SEL_PROT_DEP:
1140 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1141 break;
1142 case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
1143 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
1144 NFC_PROTO_NFC_DEP_MASK;
1145 break;
1146 }
1147
1148 nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
1149 nfc_tgt->sel_res = tgt_type_a->sel_res;
1150 nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
1151 memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
1152
1153 return 0;
1154 }
1155
1156 struct pn533_target_felica {
1157 u8 pol_res;
1158 u8 opcode;
1159 u8 nfcid2[8];
1160 u8 pad[8];
1161 /* optional */
1162 u8 syst_code[];
1163 } __packed;
1164
1165 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
1166 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
1167
1168 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
1169 int target_data_len)
1170 {
1171 if (target_data_len < sizeof(struct pn533_target_felica))
1172 return false;
1173
1174 if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
1175 return false;
1176
1177 return true;
1178 }
1179
1180 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
1181 int tgt_data_len)
1182 {
1183 struct pn533_target_felica *tgt_felica;
1184
1185 tgt_felica = (struct pn533_target_felica *)tgt_data;
1186
1187 if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
1188 return -EPROTO;
1189
1190 if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
1191 (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
1192 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1193 else
1194 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
1195
1196 memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
1197 nfc_tgt->sensf_res_len = 9;
1198
1199 return 0;
1200 }
1201
1202 struct pn533_target_jewel {
1203 __be16 sens_res;
1204 u8 jewelid[4];
1205 } __packed;
1206
1207 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
1208 int target_data_len)
1209 {
1210 u8 ssd;
1211 u8 platconf;
1212
1213 if (target_data_len < sizeof(struct pn533_target_jewel))
1214 return false;
1215
1216 /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1217 ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
1218 platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
1219
1220 if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1221 platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1222 (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1223 platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1224 return false;
1225
1226 return true;
1227 }
1228
1229 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
1230 int tgt_data_len)
1231 {
1232 struct pn533_target_jewel *tgt_jewel;
1233
1234 tgt_jewel = (struct pn533_target_jewel *)tgt_data;
1235
1236 if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
1237 return -EPROTO;
1238
1239 nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
1240 nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
1241 nfc_tgt->nfcid1_len = 4;
1242 memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
1243
1244 return 0;
1245 }
1246
1247 struct pn533_type_b_prot_info {
1248 u8 bitrate;
1249 u8 fsci_type;
1250 u8 fwi_adc_fo;
1251 } __packed;
1252
1253 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
1254 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
1255 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
1256
1257 struct pn533_type_b_sens_res {
1258 u8 opcode;
1259 u8 nfcid[4];
1260 u8 appdata[4];
1261 struct pn533_type_b_prot_info prot_info;
1262 } __packed;
1263
1264 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
1265
1266 struct pn533_target_type_b {
1267 struct pn533_type_b_sens_res sensb_res;
1268 u8 attrib_res_len;
1269 u8 attrib_res[];
1270 } __packed;
1271
1272 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
1273 int target_data_len)
1274 {
1275 if (target_data_len < sizeof(struct pn533_target_type_b))
1276 return false;
1277
1278 if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
1279 return false;
1280
1281 if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
1282 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
1283 return false;
1284
1285 return true;
1286 }
1287
1288 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
1289 int tgt_data_len)
1290 {
1291 struct pn533_target_type_b *tgt_type_b;
1292
1293 tgt_type_b = (struct pn533_target_type_b *)tgt_data;
1294
1295 if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
1296 return -EPROTO;
1297
1298 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
1299
1300 return 0;
1301 }
1302
1303 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
1304 int tgdata_len)
1305 {
1306 struct nfc_target nfc_tgt;
1307 int rc;
1308
1309 nfc_dev_dbg(&dev->interface->dev, "%s - modulation=%d", __func__,
1310 dev->poll_mod_curr);
1311
1312 if (tg != 1)
1313 return -EPROTO;
1314
1315 memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1316
1317 switch (dev->poll_mod_curr) {
1318 case PN533_POLL_MOD_106KBPS_A:
1319 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
1320 break;
1321 case PN533_POLL_MOD_212KBPS_FELICA:
1322 case PN533_POLL_MOD_424KBPS_FELICA:
1323 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
1324 break;
1325 case PN533_POLL_MOD_106KBPS_JEWEL:
1326 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
1327 break;
1328 case PN533_POLL_MOD_847KBPS_B:
1329 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
1330 break;
1331 default:
1332 nfc_dev_err(&dev->interface->dev,
1333 "Unknown current poll modulation");
1334 return -EPROTO;
1335 }
1336
1337 if (rc)
1338 return rc;
1339
1340 if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1341 nfc_dev_dbg(&dev->interface->dev,
1342 "The Tg found doesn't have the desired protocol");
1343 return -EAGAIN;
1344 }
1345
1346 nfc_dev_dbg(&dev->interface->dev,
1347 "Target found - supported protocols: 0x%x",
1348 nfc_tgt.supported_protocols);
1349
1350 dev->tgt_available_prots = nfc_tgt.supported_protocols;
1351
1352 nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1353
1354 return 0;
1355 }
1356
1357 static inline void pn533_poll_next_mod(struct pn533 *dev)
1358 {
1359 dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
1360 }
1361
1362 static void pn533_poll_reset_mod_list(struct pn533 *dev)
1363 {
1364 dev->poll_mod_count = 0;
1365 }
1366
1367 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
1368 {
1369 dev->poll_mod_active[dev->poll_mod_count] =
1370 (struct pn533_poll_modulations *)&poll_mod[mod_index];
1371 dev->poll_mod_count++;
1372 }
1373
1374 static void pn533_poll_create_mod_list(struct pn533 *dev,
1375 u32 im_protocols, u32 tm_protocols)
1376 {
1377 pn533_poll_reset_mod_list(dev);
1378
1379 if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
1380 (im_protocols & NFC_PROTO_ISO14443_MASK) ||
1381 (im_protocols & NFC_PROTO_NFC_DEP_MASK))
1382 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
1383
1384 if (im_protocols & NFC_PROTO_FELICA_MASK ||
1385 im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1386 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
1387 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
1388 }
1389
1390 if (im_protocols & NFC_PROTO_JEWEL_MASK)
1391 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
1392
1393 if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1394 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
1395
1396 if (tm_protocols)
1397 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
1398 }
1399
1400 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
1401 {
1402 u8 nbtg, tg, *tgdata;
1403 int rc, tgdata_len;
1404
1405 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1406
1407 nbtg = resp->data[0];
1408 tg = resp->data[1];
1409 tgdata = &resp->data[2];
1410 tgdata_len = resp->len - 2; /* nbtg + tg */
1411
1412 if (nbtg) {
1413 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1414
1415 /* We must stop the poll after a valid target found */
1416 if (rc == 0) {
1417 pn533_poll_reset_mod_list(dev);
1418 return 0;
1419 }
1420 }
1421
1422 return -EAGAIN;
1423 }
1424
1425 static struct sk_buff *pn533_alloc_poll_tg_frame(u8 *gbytes, size_t gbytes_len)
1426 {
1427 struct sk_buff *skb;
1428 u8 *felica, *nfcid3, *gb;
1429
1430 u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1431 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1432 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1433 0xff, 0xff}; /* System code */
1434
1435 u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1436 0x0, 0x0, 0x0,
1437 0x40}; /* SEL_RES for DEP */
1438
1439 unsigned int skb_len = 36 + /* mode (1), mifare (6),
1440 felica (18), nfcid3 (10), gb_len (1) */
1441 gbytes_len +
1442 1; /* len Tk*/
1443
1444 skb = pn533_alloc_skb(skb_len);
1445 if (!skb)
1446 return NULL;
1447
1448 /* DEP support only */
1449 *skb_put(skb, 1) |= PN533_INIT_TARGET_DEP;
1450
1451 /* MIFARE params */
1452 memcpy(skb_put(skb, 6), mifare_params, 6);
1453
1454 /* Felica params */
1455 felica = skb_put(skb, 18);
1456 memcpy(felica, felica_params, 18);
1457 get_random_bytes(felica + 2, 6);
1458
1459 /* NFCID3 */
1460 nfcid3 = skb_put(skb, 10);
1461 memset(nfcid3, 0, 10);
1462 memcpy(nfcid3, felica, 8);
1463
1464 /* General bytes */
1465 *skb_put(skb, 1) = gbytes_len;
1466
1467 gb = skb_put(skb, gbytes_len);
1468 memcpy(gb, gbytes, gbytes_len);
1469
1470 /* Len Tk */
1471 *skb_put(skb, 1) = 0;
1472
1473 return skb;
1474 }
1475
1476 #define PN533_CMD_DATAEXCH_HEAD_LEN 1
1477 #define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
1478 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1479 struct sk_buff *resp)
1480 {
1481 u8 status;
1482
1483 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1484
1485 if (IS_ERR(resp))
1486 return PTR_ERR(resp);
1487
1488 status = resp->data[0];
1489 skb_pull(resp, sizeof(status));
1490
1491 if (status != 0) {
1492 nfc_tm_deactivated(dev->nfc_dev);
1493 dev->tgt_mode = 0;
1494 dev_kfree_skb(resp);
1495 return 0;
1496 }
1497
1498 return nfc_tm_data_received(dev->nfc_dev, resp);
1499 }
1500
1501 static void pn533_wq_tg_get_data(struct work_struct *work)
1502 {
1503 struct pn533 *dev = container_of(work, struct pn533, tg_work);
1504
1505 struct sk_buff *skb;
1506 int rc;
1507
1508 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1509
1510 skb = pn533_alloc_skb(0);
1511 if (!skb)
1512 return;
1513
1514 rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1515 pn533_tm_get_data_complete, NULL);
1516
1517 if (rc < 0)
1518 dev_kfree_skb(skb);
1519
1520 return;
1521 }
1522
1523 #define ATR_REQ_GB_OFFSET 17
1524 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1525 {
1526 u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1527 size_t gb_len;
1528 int rc;
1529
1530 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1531
1532 if (resp->len < ATR_REQ_GB_OFFSET + 1)
1533 return -EINVAL;
1534
1535 mode = resp->data[0];
1536 cmd = &resp->data[1];
1537
1538 nfc_dev_dbg(&dev->interface->dev, "Target mode 0x%x len %d\n",
1539 mode, resp->len);
1540
1541 if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1542 PN533_INIT_TARGET_RESP_ACTIVE)
1543 comm_mode = NFC_COMM_ACTIVE;
1544
1545 if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0) /* Only DEP supported */
1546 return -EOPNOTSUPP;
1547
1548 gb = cmd + ATR_REQ_GB_OFFSET;
1549 gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1550
1551 rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1552 comm_mode, gb, gb_len);
1553 if (rc < 0) {
1554 nfc_dev_err(&dev->interface->dev,
1555 "Error when signaling target activation");
1556 return rc;
1557 }
1558
1559 dev->tgt_mode = 1;
1560 queue_work(dev->wq, &dev->tg_work);
1561
1562 return 0;
1563 }
1564
1565 static void pn533_listen_mode_timer(unsigned long data)
1566 {
1567 struct pn533 *dev = (struct pn533 *)data;
1568
1569 nfc_dev_dbg(&dev->interface->dev, "Listen mode timeout");
1570
1571 /* An ack will cancel the last issued command (poll) */
1572 pn533_send_ack(dev, GFP_ATOMIC);
1573
1574 dev->cancel_listen = 1;
1575
1576 pn533_poll_next_mod(dev);
1577
1578 queue_work(dev->wq, &dev->poll_work);
1579 }
1580
1581 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1582 struct sk_buff *resp)
1583 {
1584 struct pn533_poll_modulations *cur_mod;
1585 int rc;
1586
1587 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1588
1589 if (IS_ERR(resp)) {
1590 rc = PTR_ERR(resp);
1591
1592 nfc_dev_err(&dev->interface->dev, "%s Poll complete error %d",
1593 __func__, rc);
1594
1595 if (rc == -ENOENT) {
1596 if (dev->poll_mod_count != 0)
1597 return rc;
1598 else
1599 goto stop_poll;
1600 } else if (rc < 0) {
1601 nfc_dev_err(&dev->interface->dev,
1602 "Error %d when running poll", rc);
1603 goto stop_poll;
1604 }
1605 }
1606
1607 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1608
1609 if (cur_mod->len == 0) { /* Target mode */
1610 del_timer(&dev->listen_timer);
1611 rc = pn533_init_target_complete(dev, resp);
1612 goto done;
1613 }
1614
1615 /* Initiator mode */
1616 rc = pn533_start_poll_complete(dev, resp);
1617 if (!rc)
1618 goto done;
1619
1620 pn533_poll_next_mod(dev);
1621 queue_work(dev->wq, &dev->poll_work);
1622
1623 done:
1624 dev_kfree_skb(resp);
1625 return rc;
1626
1627 stop_poll:
1628 nfc_dev_err(&dev->interface->dev, "Polling operation has been stopped");
1629
1630 pn533_poll_reset_mod_list(dev);
1631 dev->poll_protocols = 0;
1632 return rc;
1633 }
1634
1635 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533_poll_modulations
1636 *mod)
1637 {
1638 struct sk_buff *skb;
1639
1640 skb = pn533_alloc_skb(mod->len);
1641 if (!skb)
1642 return NULL;
1643
1644 memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
1645
1646 return skb;
1647 }
1648
1649 static int pn533_send_poll_frame(struct pn533 *dev)
1650 {
1651 struct pn533_poll_modulations *mod;
1652 struct sk_buff *skb;
1653 int rc;
1654 u8 cmd_code;
1655
1656 mod = dev->poll_mod_active[dev->poll_mod_curr];
1657
1658 nfc_dev_dbg(&dev->interface->dev, "%s mod len %d\n",
1659 __func__, mod->len);
1660
1661 if (mod->len == 0) { /* Listen mode */
1662 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1663 skb = pn533_alloc_poll_tg_frame(dev->gb, dev->gb_len);
1664 } else { /* Polling mode */
1665 cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET;
1666 skb = pn533_alloc_poll_in_frame(mod);
1667 }
1668
1669 if (!skb) {
1670 nfc_dev_err(&dev->interface->dev, "Failed to allocate skb.");
1671 return -ENOMEM;
1672 }
1673
1674 rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1675 NULL);
1676 if (rc < 0) {
1677 dev_kfree_skb(skb);
1678 nfc_dev_err(&dev->interface->dev, "Polling loop error %d", rc);
1679 }
1680
1681 return rc;
1682 }
1683
1684 static void pn533_wq_poll(struct work_struct *work)
1685 {
1686 struct pn533 *dev = container_of(work, struct pn533, poll_work);
1687 struct pn533_poll_modulations *cur_mod;
1688 int rc;
1689
1690 cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1691
1692 nfc_dev_dbg(&dev->interface->dev,
1693 "%s cancel_listen %d modulation len %d",
1694 __func__, dev->cancel_listen, cur_mod->len);
1695
1696 if (dev->cancel_listen == 1) {
1697 dev->cancel_listen = 0;
1698 usb_kill_urb(dev->in_urb);
1699 }
1700
1701 rc = pn533_send_poll_frame(dev);
1702 if (rc)
1703 return;
1704
1705 if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1706 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1707
1708 return;
1709 }
1710
1711 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1712 u32 im_protocols, u32 tm_protocols)
1713 {
1714 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1715
1716 nfc_dev_dbg(&dev->interface->dev,
1717 "%s: im protocols 0x%x tm protocols 0x%x",
1718 __func__, im_protocols, tm_protocols);
1719
1720 if (dev->tgt_active_prot) {
1721 nfc_dev_err(&dev->interface->dev,
1722 "Cannot poll with a target already activated");
1723 return -EBUSY;
1724 }
1725
1726 if (dev->tgt_mode) {
1727 nfc_dev_err(&dev->interface->dev,
1728 "Cannot poll while already being activated");
1729 return -EBUSY;
1730 }
1731
1732 if (tm_protocols) {
1733 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1734 if (dev->gb == NULL)
1735 tm_protocols = 0;
1736 }
1737
1738 dev->poll_mod_curr = 0;
1739 pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1740 dev->poll_protocols = im_protocols;
1741 dev->listen_protocols = tm_protocols;
1742
1743 return pn533_send_poll_frame(dev);
1744 }
1745
1746 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1747 {
1748 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1749
1750 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1751
1752 del_timer(&dev->listen_timer);
1753
1754 if (!dev->poll_mod_count) {
1755 nfc_dev_dbg(&dev->interface->dev,
1756 "Polling operation was not running");
1757 return;
1758 }
1759
1760 /* An ack will cancel the last issued command (poll) */
1761 pn533_send_ack(dev, GFP_KERNEL);
1762
1763 /* prevent pn533_start_poll_complete to issue a new poll meanwhile */
1764 usb_kill_urb(dev->in_urb);
1765
1766 pn533_poll_reset_mod_list(dev);
1767 }
1768
1769 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1770 {
1771 struct pn533_cmd_activate_response *rsp;
1772 u16 gt_len;
1773 int rc;
1774
1775 struct sk_buff *skb;
1776 struct sk_buff *resp;
1777
1778 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1779
1780 skb = pn533_alloc_skb(sizeof(u8) * 2); /*TG + Next*/
1781 if (!skb)
1782 return -ENOMEM;
1783
1784 *skb_put(skb, sizeof(u8)) = 1; /* TG */
1785 *skb_put(skb, sizeof(u8)) = 0; /* Next */
1786
1787 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1788 if (IS_ERR(resp))
1789 return PTR_ERR(resp);
1790
1791 rsp = (struct pn533_cmd_activate_response *)resp->data;
1792 rc = rsp->status & PN533_CMD_RET_MASK;
1793 if (rc != PN533_CMD_RET_SUCCESS)
1794 dev_kfree_skb(resp);
1795 return -EIO;
1796
1797 /* ATR_RES general bytes are located at offset 16 */
1798 gt_len = resp->len - 16;
1799 rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1800
1801 dev_kfree_skb(resp);
1802 return rc;
1803 }
1804
1805 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1806 struct nfc_target *target, u32 protocol)
1807 {
1808 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1809 int rc;
1810
1811 nfc_dev_dbg(&dev->interface->dev, "%s - protocol=%u", __func__,
1812 protocol);
1813
1814 if (dev->poll_mod_count) {
1815 nfc_dev_err(&dev->interface->dev,
1816 "Cannot activate while polling");
1817 return -EBUSY;
1818 }
1819
1820 if (dev->tgt_active_prot) {
1821 nfc_dev_err(&dev->interface->dev,
1822 "There is already an active target");
1823 return -EBUSY;
1824 }
1825
1826 if (!dev->tgt_available_prots) {
1827 nfc_dev_err(&dev->interface->dev,
1828 "There is no available target to activate");
1829 return -EINVAL;
1830 }
1831
1832 if (!(dev->tgt_available_prots & (1 << protocol))) {
1833 nfc_dev_err(&dev->interface->dev,
1834 "Target doesn't support requested proto %u",
1835 protocol);
1836 return -EINVAL;
1837 }
1838
1839 if (protocol == NFC_PROTO_NFC_DEP) {
1840 rc = pn533_activate_target_nfcdep(dev);
1841 if (rc) {
1842 nfc_dev_err(&dev->interface->dev,
1843 "Activating target with DEP failed %d", rc);
1844 return rc;
1845 }
1846 }
1847
1848 dev->tgt_active_prot = protocol;
1849 dev->tgt_available_prots = 0;
1850
1851 return 0;
1852 }
1853
1854 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1855 struct nfc_target *target)
1856 {
1857 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1858
1859 struct sk_buff *skb;
1860 struct sk_buff *resp;
1861
1862 int rc;
1863
1864 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1865
1866 if (!dev->tgt_active_prot) {
1867 nfc_dev_err(&dev->interface->dev, "There is no active target");
1868 return;
1869 }
1870
1871 dev->tgt_active_prot = 0;
1872 skb_queue_purge(&dev->resp_q);
1873
1874 skb = pn533_alloc_skb(sizeof(u8));
1875 if (!skb)
1876 return;
1877
1878 *skb_put(skb, 1) = 1; /* TG*/
1879
1880 resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_RELEASE, skb);
1881 if (IS_ERR(resp))
1882 return;
1883
1884 rc = resp->data[0] & PN533_CMD_RET_MASK;
1885 if (rc != PN533_CMD_RET_SUCCESS)
1886 nfc_dev_err(&dev->interface->dev,
1887 "Error 0x%x when releasing the target", rc);
1888
1889 dev_kfree_skb(resp);
1890 return;
1891 }
1892
1893
1894 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1895 struct sk_buff *resp)
1896 {
1897 struct pn533_cmd_jump_dep_response *rsp;
1898 u8 target_gt_len;
1899 int rc;
1900 u8 active = *(u8 *)arg;
1901
1902 kfree(arg);
1903
1904 if (IS_ERR(resp))
1905 return PTR_ERR(resp);
1906
1907 if (dev->tgt_available_prots &&
1908 !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1909 nfc_dev_err(&dev->interface->dev,
1910 "The target does not support DEP");
1911 rc = -EINVAL;
1912 goto error;
1913 }
1914
1915 rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1916
1917 rc = rsp->status & PN533_CMD_RET_MASK;
1918 if (rc != PN533_CMD_RET_SUCCESS) {
1919 nfc_dev_err(&dev->interface->dev,
1920 "Bringing DEP link up failed %d", rc);
1921 goto error;
1922 }
1923
1924 if (!dev->tgt_available_prots) {
1925 struct nfc_target nfc_target;
1926
1927 nfc_dev_dbg(&dev->interface->dev, "Creating new target");
1928
1929 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1930 nfc_target.nfcid1_len = 10;
1931 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1932 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1933 if (rc)
1934 goto error;
1935
1936 dev->tgt_available_prots = 0;
1937 }
1938
1939 dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1940
1941 /* ATR_RES general bytes are located at offset 17 */
1942 target_gt_len = resp->len - 17;
1943 rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1944 rsp->gt, target_gt_len);
1945 if (rc == 0)
1946 rc = nfc_dep_link_is_up(dev->nfc_dev,
1947 dev->nfc_dev->targets[0].idx,
1948 !active, NFC_RF_INITIATOR);
1949
1950 error:
1951 dev_kfree_skb(resp);
1952 return rc;
1953 }
1954
1955 static int pn533_mod_to_baud(struct pn533 *dev)
1956 {
1957 switch (dev->poll_mod_curr) {
1958 case PN533_POLL_MOD_106KBPS_A:
1959 return 0;
1960 case PN533_POLL_MOD_212KBPS_FELICA:
1961 return 1;
1962 case PN533_POLL_MOD_424KBPS_FELICA:
1963 return 2;
1964 default:
1965 return -EINVAL;
1966 }
1967 }
1968
1969 #define PASSIVE_DATA_LEN 5
1970 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1971 u8 comm_mode, u8 *gb, size_t gb_len)
1972 {
1973 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1974 struct sk_buff *skb;
1975 int rc, baud, skb_len;
1976 u8 *next, *arg;
1977
1978 u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1979
1980 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1981
1982 if (dev->poll_mod_count) {
1983 nfc_dev_err(&dev->interface->dev,
1984 "Cannot bring the DEP link up while polling");
1985 return -EBUSY;
1986 }
1987
1988 if (dev->tgt_active_prot) {
1989 nfc_dev_err(&dev->interface->dev,
1990 "There is already an active target");
1991 return -EBUSY;
1992 }
1993
1994 baud = pn533_mod_to_baud(dev);
1995 if (baud < 0) {
1996 nfc_dev_err(&dev->interface->dev,
1997 "Invalid curr modulation %d", dev->poll_mod_curr);
1998 return baud;
1999 }
2000
2001 skb_len = 3 + gb_len; /* ActPass + BR + Next */
2002 if (comm_mode == NFC_COMM_PASSIVE)
2003 skb_len += PASSIVE_DATA_LEN;
2004
2005 skb = pn533_alloc_skb(skb_len);
2006 if (!skb)
2007 return -ENOMEM;
2008
2009 *skb_put(skb, 1) = !comm_mode; /* ActPass */
2010 *skb_put(skb, 1) = baud; /* Baud rate */
2011
2012 next = skb_put(skb, 1); /* Next */
2013 *next = 0;
2014
2015 if (comm_mode == NFC_COMM_PASSIVE && baud > 0) {
2016 memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data,
2017 PASSIVE_DATA_LEN);
2018 *next |= 1;
2019 }
2020
2021 if (gb != NULL && gb_len > 0) {
2022 memcpy(skb_put(skb, gb_len), gb, gb_len);
2023 *next |= 4; /* We have some Gi */
2024 } else {
2025 *next = 0;
2026 }
2027
2028 arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2029 if (!arg) {
2030 dev_kfree_skb(skb);
2031 return -ENOMEM;
2032 }
2033
2034 *arg = !comm_mode;
2035
2036 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
2037 pn533_in_dep_link_up_complete, arg);
2038
2039 if (rc < 0) {
2040 dev_kfree_skb(skb);
2041 kfree(arg);
2042 }
2043
2044 return rc;
2045 }
2046
2047 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
2048 {
2049 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2050
2051 pn533_poll_reset_mod_list(dev);
2052
2053 if (dev->tgt_mode || dev->tgt_active_prot) {
2054 pn533_send_ack(dev, GFP_KERNEL);
2055 usb_kill_urb(dev->in_urb);
2056 }
2057
2058 dev->tgt_active_prot = 0;
2059 dev->tgt_mode = 0;
2060
2061 skb_queue_purge(&dev->resp_q);
2062
2063 return 0;
2064 }
2065
2066 struct pn533_data_exchange_arg {
2067 data_exchange_cb_t cb;
2068 void *cb_context;
2069 };
2070
2071 static struct sk_buff *pn533_build_response(struct pn533 *dev)
2072 {
2073 struct sk_buff *skb, *tmp, *t;
2074 unsigned int skb_len = 0, tmp_len = 0;
2075
2076 nfc_dev_dbg(&dev->interface->dev, "%s\n", __func__);
2077
2078 if (skb_queue_empty(&dev->resp_q))
2079 return NULL;
2080
2081 if (skb_queue_len(&dev->resp_q) == 1) {
2082 skb = skb_dequeue(&dev->resp_q);
2083 goto out;
2084 }
2085
2086 skb_queue_walk_safe(&dev->resp_q, tmp, t)
2087 skb_len += tmp->len;
2088
2089 nfc_dev_dbg(&dev->interface->dev, "%s total length %d\n",
2090 __func__, skb_len);
2091
2092 skb = alloc_skb(skb_len, GFP_KERNEL);
2093 if (skb == NULL)
2094 goto out;
2095
2096 skb_put(skb, skb_len);
2097
2098 skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2099 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2100 tmp_len += tmp->len;
2101 }
2102
2103 out:
2104 skb_queue_purge(&dev->resp_q);
2105
2106 return skb;
2107 }
2108
2109 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2110 struct sk_buff *resp)
2111 {
2112 struct pn533_data_exchange_arg *arg = _arg;
2113 struct sk_buff *skb;
2114 int rc = 0;
2115 u8 status, ret, mi;
2116
2117 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2118
2119 if (IS_ERR(resp)) {
2120 rc = PTR_ERR(resp);
2121 goto _error;
2122 }
2123
2124 status = resp->data[0];
2125 ret = status & PN533_CMD_RET_MASK;
2126 mi = status & PN533_CMD_MI_MASK;
2127
2128 skb_pull(resp, sizeof(status));
2129
2130 if (ret != PN533_CMD_RET_SUCCESS) {
2131 nfc_dev_err(&dev->interface->dev,
2132 "PN533 reported error %d when exchanging data",
2133 ret);
2134 rc = -EIO;
2135 goto error;
2136 }
2137
2138 skb_queue_tail(&dev->resp_q, resp);
2139
2140 if (mi) {
2141 dev->cmd_complete_mi_arg = arg;
2142 queue_work(dev->wq, &dev->mi_work);
2143 return -EINPROGRESS;
2144 }
2145
2146 skb = pn533_build_response(dev);
2147 if (!skb)
2148 goto error;
2149
2150 arg->cb(arg->cb_context, skb, 0);
2151 kfree(arg);
2152 return 0;
2153
2154 error:
2155 dev_kfree_skb(resp);
2156 _error:
2157 skb_queue_purge(&dev->resp_q);
2158 arg->cb(arg->cb_context, NULL, rc);
2159 kfree(arg);
2160 return rc;
2161 }
2162
2163 static int pn533_transceive(struct nfc_dev *nfc_dev,
2164 struct nfc_target *target, struct sk_buff *skb,
2165 data_exchange_cb_t cb, void *cb_context)
2166 {
2167 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2168 struct pn533_data_exchange_arg *arg = NULL;
2169 int rc;
2170
2171 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2172
2173 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2174 /* TODO: Implement support to multi-part data exchange */
2175 nfc_dev_err(&dev->interface->dev,
2176 "Data length greater than the max allowed: %d",
2177 PN533_CMD_DATAEXCH_DATA_MAXLEN);
2178 rc = -ENOSYS;
2179 goto error;
2180 }
2181
2182 if (!dev->tgt_active_prot) {
2183 nfc_dev_err(&dev->interface->dev,
2184 "Can't exchange data if there is no active target");
2185 rc = -EINVAL;
2186 goto error;
2187 }
2188
2189 arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2190 if (!arg) {
2191 rc = -ENOMEM;
2192 goto error;
2193 }
2194
2195 arg->cb = cb;
2196 arg->cb_context = cb_context;
2197
2198 switch (dev->device_type) {
2199 case PN533_DEVICE_PASORI:
2200 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2201 rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2202 skb,
2203 pn533_data_exchange_complete,
2204 arg);
2205
2206 break;
2207 }
2208 default:
2209 *skb_push(skb, sizeof(u8)) = 1; /*TG*/
2210
2211 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2212 skb, pn533_data_exchange_complete,
2213 arg);
2214
2215 break;
2216 }
2217
2218 if (rc < 0) /* rc from send_async */
2219 goto error;
2220
2221 return 0;
2222
2223 error:
2224 kfree(arg);
2225 dev_kfree_skb(skb);
2226 return rc;
2227 }
2228
2229 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2230 struct sk_buff *resp)
2231 {
2232 u8 status;
2233
2234 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2235
2236 if (IS_ERR(resp))
2237 return PTR_ERR(resp);
2238
2239 status = resp->data[0];
2240
2241 dev_kfree_skb(resp);
2242
2243 if (status != 0) {
2244 nfc_tm_deactivated(dev->nfc_dev);
2245
2246 dev->tgt_mode = 0;
2247
2248 return 0;
2249 }
2250
2251 queue_work(dev->wq, &dev->tg_work);
2252
2253 return 0;
2254 }
2255
2256 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2257 {
2258 struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2259 int rc;
2260
2261 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2262
2263 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2264 nfc_dev_err(&dev->interface->dev,
2265 "Data length greater than the max allowed: %d",
2266 PN533_CMD_DATAEXCH_DATA_MAXLEN);
2267 return -ENOSYS;
2268 }
2269
2270 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2271 pn533_tm_send_complete, NULL);
2272 if (rc < 0)
2273 dev_kfree_skb(skb);
2274
2275 return rc;
2276 }
2277
2278 static void pn533_wq_mi_recv(struct work_struct *work)
2279 {
2280 struct pn533 *dev = container_of(work, struct pn533, mi_work);
2281
2282 struct sk_buff *skb;
2283 int rc;
2284
2285 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2286
2287 skb = pn533_alloc_skb(PN533_CMD_DATAEXCH_HEAD_LEN);
2288 if (!skb)
2289 goto error;
2290
2291 switch (dev->device_type) {
2292 case PN533_DEVICE_PASORI:
2293 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2294 rc = pn533_send_cmd_direct_async(dev,
2295 PN533_CMD_IN_COMM_THRU,
2296 skb,
2297 pn533_data_exchange_complete,
2298 dev->cmd_complete_mi_arg);
2299
2300 break;
2301 }
2302 default:
2303 *skb_put(skb, sizeof(u8)) = 1; /*TG*/
2304
2305 rc = pn533_send_cmd_direct_async(dev,
2306 PN533_CMD_IN_DATA_EXCHANGE,
2307 skb,
2308 pn533_data_exchange_complete,
2309 dev->cmd_complete_mi_arg);
2310
2311 break;
2312 }
2313
2314 if (rc == 0) /* success */
2315 return;
2316
2317 nfc_dev_err(&dev->interface->dev,
2318 "Error %d when trying to perform data_exchange", rc);
2319
2320 dev_kfree_skb(skb);
2321 kfree(dev->cmd_complete_arg);
2322
2323 error:
2324 pn533_send_ack(dev, GFP_KERNEL);
2325 queue_work(dev->wq, &dev->cmd_work);
2326 }
2327
2328 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2329 u8 cfgdata_len)
2330 {
2331 struct sk_buff *skb;
2332 struct sk_buff *resp;
2333
2334 int skb_len;
2335
2336 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2337
2338 skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2339
2340 skb = pn533_alloc_skb(skb_len);
2341 if (!skb)
2342 return -ENOMEM;
2343
2344 *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2345 memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2346
2347 resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2348 if (IS_ERR(resp))
2349 return PTR_ERR(resp);
2350
2351 dev_kfree_skb(resp);
2352 return 0;
2353 }
2354
2355 static int pn533_get_firmware_version(struct pn533 *dev,
2356 struct pn533_fw_version *fv)
2357 {
2358 struct sk_buff *skb;
2359 struct sk_buff *resp;
2360
2361 skb = pn533_alloc_skb(0);
2362 if (!skb)
2363 return -ENOMEM;
2364
2365 resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2366 if (IS_ERR(resp))
2367 return PTR_ERR(resp);
2368
2369 fv->ic = resp->data[0];
2370 fv->ver = resp->data[1];
2371 fv->rev = resp->data[2];
2372 fv->support = resp->data[3];
2373
2374 dev_kfree_skb(resp);
2375 return 0;
2376 }
2377
2378 static int pn533_fw_reset(struct pn533 *dev)
2379 {
2380 struct sk_buff *skb;
2381 struct sk_buff *resp;
2382
2383 nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2384
2385 skb = pn533_alloc_skb(sizeof(u8));
2386 if (!skb)
2387 return -ENOMEM;
2388
2389 *skb_put(skb, sizeof(u8)) = 0x1;
2390
2391 resp = pn533_send_cmd_sync(dev, 0x18, skb);
2392 if (IS_ERR(resp))
2393 return PTR_ERR(resp);
2394
2395 dev_kfree_skb(resp);
2396
2397 return 0;
2398 }
2399
2400 static struct nfc_ops pn533_nfc_ops = {
2401 .dev_up = NULL,
2402 .dev_down = NULL,
2403 .dep_link_up = pn533_dep_link_up,
2404 .dep_link_down = pn533_dep_link_down,
2405 .start_poll = pn533_start_poll,
2406 .stop_poll = pn533_stop_poll,
2407 .activate_target = pn533_activate_target,
2408 .deactivate_target = pn533_deactivate_target,
2409 .im_transceive = pn533_transceive,
2410 .tm_send = pn533_tm_send,
2411 };
2412
2413 static int pn533_setup(struct pn533 *dev)
2414 {
2415 struct pn533_config_max_retries max_retries;
2416 struct pn533_config_timing timing;
2417 u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2418 int rc;
2419
2420 switch (dev->device_type) {
2421 case PN533_DEVICE_STD:
2422 max_retries.mx_rty_atr = PN533_CONFIG_MAX_RETRIES_ENDLESS;
2423 max_retries.mx_rty_psl = 2;
2424 max_retries.mx_rty_passive_act =
2425 PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2426
2427 timing.rfu = PN533_CONFIG_TIMING_102;
2428 timing.atr_res_timeout = PN533_CONFIG_TIMING_204;
2429 timing.dep_timeout = PN533_CONFIG_TIMING_409;
2430
2431 break;
2432
2433 case PN533_DEVICE_PASORI:
2434 max_retries.mx_rty_atr = 0x2;
2435 max_retries.mx_rty_psl = 0x1;
2436 max_retries.mx_rty_passive_act =
2437 PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2438
2439 timing.rfu = PN533_CONFIG_TIMING_102;
2440 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2441 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2442
2443 break;
2444
2445 default:
2446 nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2447 dev->device_type);
2448 return -EINVAL;
2449 }
2450
2451 rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2452 (u8 *)&max_retries, sizeof(max_retries));
2453 if (rc) {
2454 nfc_dev_err(&dev->interface->dev,
2455 "Error on setting MAX_RETRIES config");
2456 return rc;
2457 }
2458
2459
2460 rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2461 (u8 *)&timing, sizeof(timing));
2462 if (rc) {
2463 nfc_dev_err(&dev->interface->dev,
2464 "Error on setting RF timings");
2465 return rc;
2466 }
2467
2468 switch (dev->device_type) {
2469 case PN533_DEVICE_STD:
2470 break;
2471
2472 case PN533_DEVICE_PASORI:
2473 pn533_fw_reset(dev);
2474
2475 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2476 pasori_cfg, 3);
2477 if (rc) {
2478 nfc_dev_err(&dev->interface->dev,
2479 "Error while settings PASORI config");
2480 return rc;
2481 }
2482
2483 pn533_fw_reset(dev);
2484
2485 break;
2486 }
2487
2488 return 0;
2489 }
2490
2491 static int pn533_probe(struct usb_interface *interface,
2492 const struct usb_device_id *id)
2493 {
2494 struct pn533_fw_version fw_ver;
2495 struct pn533 *dev;
2496 struct usb_host_interface *iface_desc;
2497 struct usb_endpoint_descriptor *endpoint;
2498 int in_endpoint = 0;
2499 int out_endpoint = 0;
2500 int rc = -ENOMEM;
2501 int i;
2502 u32 protocols;
2503
2504 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2505 if (!dev)
2506 return -ENOMEM;
2507
2508 dev->udev = usb_get_dev(interface_to_usbdev(interface));
2509 dev->interface = interface;
2510 mutex_init(&dev->cmd_lock);
2511
2512 iface_desc = interface->cur_altsetting;
2513 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
2514 endpoint = &iface_desc->endpoint[i].desc;
2515
2516 if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
2517 in_endpoint = endpoint->bEndpointAddress;
2518
2519 if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
2520 out_endpoint = endpoint->bEndpointAddress;
2521 }
2522
2523 if (!in_endpoint || !out_endpoint) {
2524 nfc_dev_err(&interface->dev,
2525 "Could not find bulk-in or bulk-out endpoint");
2526 rc = -ENODEV;
2527 goto error;
2528 }
2529
2530 dev->in_frame = kmalloc(PN533_NORMAL_FRAME_MAX_LEN, GFP_KERNEL);
2531 dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
2532 dev->out_frame = kmalloc(PN533_NORMAL_FRAME_MAX_LEN, GFP_KERNEL);
2533 dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
2534
2535 if (!dev->in_frame || !dev->out_frame || !dev->in_urb || !dev->out_urb)
2536 goto error;
2537
2538 usb_fill_bulk_urb(dev->in_urb, dev->udev,
2539 usb_rcvbulkpipe(dev->udev, in_endpoint),
2540 NULL, 0, NULL, dev);
2541 usb_fill_bulk_urb(dev->out_urb, dev->udev,
2542 usb_sndbulkpipe(dev->udev, out_endpoint),
2543 NULL, 0, pn533_send_complete, dev);
2544
2545 INIT_WORK(&dev->cmd_work, pn533_wq_cmd);
2546 INIT_WORK(&dev->cmd_complete_work, pn533_wq_cmd_complete);
2547 INIT_WORK(&dev->mi_work, pn533_wq_mi_recv);
2548 INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
2549 INIT_WORK(&dev->poll_work, pn533_wq_poll);
2550 dev->wq = alloc_ordered_workqueue("pn533", 0);
2551 if (dev->wq == NULL)
2552 goto error;
2553
2554 init_timer(&dev->listen_timer);
2555 dev->listen_timer.data = (unsigned long) dev;
2556 dev->listen_timer.function = pn533_listen_mode_timer;
2557
2558 skb_queue_head_init(&dev->resp_q);
2559
2560 INIT_LIST_HEAD(&dev->cmd_queue);
2561
2562 usb_set_intfdata(interface, dev);
2563
2564 memset(&fw_ver, 0, sizeof(fw_ver));
2565 rc = pn533_get_firmware_version(dev, &fw_ver);
2566 if (rc < 0)
2567 goto destroy_wq;
2568
2569 nfc_dev_info(&dev->interface->dev,
2570 "NXP PN533 firmware ver %d.%d now attached",
2571 fw_ver.ver, fw_ver.rev);
2572
2573 dev->device_type = id->driver_info;
2574 switch (dev->device_type) {
2575 case PN533_DEVICE_STD:
2576 protocols = PN533_ALL_PROTOCOLS;
2577 break;
2578
2579 case PN533_DEVICE_PASORI:
2580 protocols = PN533_NO_TYPE_B_PROTOCOLS;
2581 break;
2582
2583 default:
2584 nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2585 dev->device_type);
2586 rc = -EINVAL;
2587 goto destroy_wq;
2588 }
2589
2590 dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2591 PN533_FRAME_HEADER_LEN +
2592 PN533_CMD_DATAEXCH_HEAD_LEN,
2593 PN533_FRAME_TAIL_LEN);
2594 if (!dev->nfc_dev)
2595 goto destroy_wq;
2596
2597 nfc_set_parent_dev(dev->nfc_dev, &interface->dev);
2598 nfc_set_drvdata(dev->nfc_dev, dev);
2599
2600 rc = nfc_register_device(dev->nfc_dev);
2601 if (rc)
2602 goto free_nfc_dev;
2603
2604 rc = pn533_setup(dev);
2605 if (rc)
2606 goto unregister_nfc_dev;
2607
2608 return 0;
2609
2610 unregister_nfc_dev:
2611 nfc_unregister_device(dev->nfc_dev);
2612
2613 free_nfc_dev:
2614 nfc_free_device(dev->nfc_dev);
2615
2616 destroy_wq:
2617 destroy_workqueue(dev->wq);
2618 error:
2619 kfree(dev->in_frame);
2620 usb_free_urb(dev->in_urb);
2621 kfree(dev->out_frame);
2622 usb_free_urb(dev->out_urb);
2623 kfree(dev);
2624 return rc;
2625 }
2626
2627 static void pn533_disconnect(struct usb_interface *interface)
2628 {
2629 struct pn533 *dev;
2630 struct pn533_cmd *cmd, *n;
2631
2632 dev = usb_get_intfdata(interface);
2633 usb_set_intfdata(interface, NULL);
2634
2635 nfc_unregister_device(dev->nfc_dev);
2636 nfc_free_device(dev->nfc_dev);
2637
2638 usb_kill_urb(dev->in_urb);
2639 usb_kill_urb(dev->out_urb);
2640
2641 destroy_workqueue(dev->wq);
2642
2643 skb_queue_purge(&dev->resp_q);
2644
2645 del_timer(&dev->listen_timer);
2646
2647 list_for_each_entry_safe(cmd, n, &dev->cmd_queue, queue) {
2648 list_del(&cmd->queue);
2649 kfree(cmd);
2650 }
2651
2652 kfree(dev->in_frame);
2653 usb_free_urb(dev->in_urb);
2654 kfree(dev->out_frame);
2655 usb_free_urb(dev->out_urb);
2656 kfree(dev);
2657
2658 nfc_dev_info(&interface->dev, "NXP PN533 NFC device disconnected");
2659 }
2660
2661 static struct usb_driver pn533_driver = {
2662 .name = "pn533",
2663 .probe = pn533_probe,
2664 .disconnect = pn533_disconnect,
2665 .id_table = pn533_table,
2666 };
2667
2668 module_usb_driver(pn533_driver);
2669
2670 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>,"
2671 " Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2672 MODULE_DESCRIPTION("PN533 usb driver ver " VERSION);
2673 MODULE_VERSION(VERSION);
2674 MODULE_LICENSE("GPL");
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