Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/nfc/pn533.c

  1 /*
  2  * Copyright (C) 2011 Instituto Nokia de Tecnologia
  3  * Copyright (C) 2012-2013 Tieto Poland
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License as published by
  7  * the Free Software Foundation; either version 2 of the License, or
  8  * (at your option) any later version.
  9  *
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 13  * GNU General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
 17  */
 18 
 19 #include <linux/device.h>
 20 #include <linux/kernel.h>
 21 #include <linux/module.h>
 22 #include <linux/slab.h>
 23 #include <linux/usb.h>
 24 #include <linux/nfc.h>
 25 #include <linux/netdevice.h>
 26 #include <net/nfc/nfc.h>
 27 
 28 #define VERSION "0.2"
 29 
 30 #define PN533_VENDOR_ID 0x4CC
 31 #define PN533_PRODUCT_ID 0x2533
 32 
 33 #define SCM_VENDOR_ID 0x4E6
 34 #define SCL3711_PRODUCT_ID 0x5591
 35 
 36 #define SONY_VENDOR_ID         0x054c
 37 #define PASORI_PRODUCT_ID      0x02e1
 38 
 39 #define ACS_VENDOR_ID 0x072f
 40 #define ACR122U_PRODUCT_ID 0x2200
 41 
 42 #define PN533_DEVICE_STD     0x1
 43 #define PN533_DEVICE_PASORI  0x2
 44 #define PN533_DEVICE_ACR122U 0x3
 45 
 46 #define PN533_ALL_PROTOCOLS (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK |\
 47                              NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK |\
 48                              NFC_PROTO_NFC_DEP_MASK |\
 49                              NFC_PROTO_ISO14443_B_MASK)
 50 
 51 #define PN533_NO_TYPE_B_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
 52                                    NFC_PROTO_MIFARE_MASK | \
 53                                    NFC_PROTO_FELICA_MASK | \
 54                                    NFC_PROTO_ISO14443_MASK | \
 55                                    NFC_PROTO_NFC_DEP_MASK)
 56 
 57 static const struct usb_device_id pn533_table[] = {
 58         { USB_DEVICE(PN533_VENDOR_ID, PN533_PRODUCT_ID),
 59           .driver_info = PN533_DEVICE_STD },
 60         { USB_DEVICE(SCM_VENDOR_ID, SCL3711_PRODUCT_ID),
 61           .driver_info = PN533_DEVICE_STD },
 62         { USB_DEVICE(SONY_VENDOR_ID, PASORI_PRODUCT_ID),
 63           .driver_info = PN533_DEVICE_PASORI },
 64         { USB_DEVICE(ACS_VENDOR_ID, ACR122U_PRODUCT_ID),
 65           .driver_info = PN533_DEVICE_ACR122U },
 66         { }
 67 };
 68 MODULE_DEVICE_TABLE(usb, pn533_table);
 69 
 70 /* How much time we spend listening for initiators */
 71 #define PN533_LISTEN_TIME 2
 72 /* Delay between each poll frame (ms) */
 73 #define PN533_POLL_INTERVAL 10
 74 
 75 /* Standard pn533 frame definitions (standard and extended)*/
 76 #define PN533_STD_FRAME_HEADER_LEN (sizeof(struct pn533_std_frame) \
 77                                         + 2) /* data[0] TFI, data[1] CC */
 78 #define PN533_STD_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
 79 
 80 #define PN533_EXT_FRAME_HEADER_LEN (sizeof(struct pn533_ext_frame) \
 81                                         + 2) /* data[0] TFI, data[1] CC */
 82 
 83 #define PN533_CMD_DATAEXCH_DATA_MAXLEN  262
 84 #define PN533_CMD_DATAFRAME_MAXLEN      240     /* max data length (send) */
 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_STD_FRAME_MAX_PAYLOAD_LEN 263
 91 
 92 #define PN533_STD_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2),
 93                                   Postamble (1) */
 94 #define PN533_STD_FRAME_CHECKSUM(f) (f->data[f->datalen])
 95 #define PN533_STD_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])
 96 /* Half start code (3), LEN (4) should be 0xffff for extended frame */
 97 #define PN533_STD_IS_EXTENDED(hdr) ((hdr)->datalen == 0xFF \
 98                                         && (hdr)->datalen_checksum == 0xFF)
 99 #define PN533_EXT_FRAME_CHECKSUM(f) (f->data[be16_to_cpu(f->datalen)])
100 
101 /* start of frame */
102 #define PN533_STD_FRAME_SOF 0x00FF
103 
104 /* standard frame identifier: in/out/error */
105 #define PN533_STD_FRAME_IDENTIFIER(f) (f->data[0]) /* TFI */
106 #define PN533_STD_FRAME_DIR_OUT 0xD4
107 #define PN533_STD_FRAME_DIR_IN 0xD5
108 
109 /* ACS ACR122 pn533 frame definitions */
110 #define PN533_ACR122_TX_FRAME_HEADER_LEN (sizeof(struct pn533_acr122_tx_frame) \
111                                           + 2)
112 #define PN533_ACR122_TX_FRAME_TAIL_LEN 0
113 #define PN533_ACR122_RX_FRAME_HEADER_LEN (sizeof(struct pn533_acr122_rx_frame) \
114                                           + 2)
115 #define PN533_ACR122_RX_FRAME_TAIL_LEN 2
116 #define PN533_ACR122_FRAME_MAX_PAYLOAD_LEN PN533_STD_FRAME_MAX_PAYLOAD_LEN
117 
118 /* CCID messages types */
119 #define PN533_ACR122_PC_TO_RDR_ICCPOWERON 0x62
120 #define PN533_ACR122_PC_TO_RDR_ESCAPE 0x6B
121 
122 #define PN533_ACR122_RDR_TO_PC_ESCAPE 0x83
123 
124 /* PN533 Commands */
125 #define PN533_FRAME_CMD(f) (f->data[1])
126 
127 #define PN533_CMD_GET_FIRMWARE_VERSION 0x02
128 #define PN533_CMD_RF_CONFIGURATION 0x32
129 #define PN533_CMD_IN_DATA_EXCHANGE 0x40
130 #define PN533_CMD_IN_COMM_THRU     0x42
131 #define PN533_CMD_IN_LIST_PASSIVE_TARGET 0x4A
132 #define PN533_CMD_IN_ATR 0x50
133 #define PN533_CMD_IN_RELEASE 0x52
134 #define PN533_CMD_IN_JUMP_FOR_DEP 0x56
135 
136 #define PN533_CMD_TG_INIT_AS_TARGET 0x8c
137 #define PN533_CMD_TG_GET_DATA 0x86
138 #define PN533_CMD_TG_SET_DATA 0x8e
139 #define PN533_CMD_TG_SET_META_DATA 0x94
140 #define PN533_CMD_UNDEF 0xff
141 
142 #define PN533_CMD_RESPONSE(cmd) (cmd + 1)
143 
144 /* PN533 Return codes */
145 #define PN533_CMD_RET_MASK 0x3F
146 #define PN533_CMD_MI_MASK 0x40
147 #define PN533_CMD_RET_SUCCESS 0x00
148 
149 struct pn533;
150 
151 typedef int (*pn533_send_async_complete_t) (struct pn533 *dev, void *arg,
152                                         struct sk_buff *resp);
153 
154 /* structs for pn533 commands */
155 
156 /* PN533_CMD_GET_FIRMWARE_VERSION */
157 struct pn533_fw_version {
158         u8 ic;
159         u8 ver;
160         u8 rev;
161         u8 support;
162 };
163 
164 /* PN533_CMD_RF_CONFIGURATION */
165 #define PN533_CFGITEM_RF_FIELD    0x01
166 #define PN533_CFGITEM_TIMING      0x02
167 #define PN533_CFGITEM_MAX_RETRIES 0x05
168 #define PN533_CFGITEM_PASORI      0x82
169 
170 #define PN533_CFGITEM_RF_FIELD_AUTO_RFCA 0x2
171 #define PN533_CFGITEM_RF_FIELD_ON        0x1
172 #define PN533_CFGITEM_RF_FIELD_OFF       0x0
173 
174 #define PN533_CONFIG_TIMING_102 0xb
175 #define PN533_CONFIG_TIMING_204 0xc
176 #define PN533_CONFIG_TIMING_409 0xd
177 #define PN533_CONFIG_TIMING_819 0xe
178 
179 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
180 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
181 
182 struct pn533_config_max_retries {
183         u8 mx_rty_atr;
184         u8 mx_rty_psl;
185         u8 mx_rty_passive_act;
186 } __packed;
187 
188 struct pn533_config_timing {
189         u8 rfu;
190         u8 atr_res_timeout;
191         u8 dep_timeout;
192 } __packed;
193 
194 /* PN533_CMD_IN_LIST_PASSIVE_TARGET */
195 
196 /* felica commands opcode */
197 #define PN533_FELICA_OPC_SENSF_REQ 0
198 #define PN533_FELICA_OPC_SENSF_RES 1
199 /* felica SENSF_REQ parameters */
200 #define PN533_FELICA_SENSF_SC_ALL 0xFFFF
201 #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
202 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
203 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
204 
205 /* type B initiator_data values */
206 #define PN533_TYPE_B_AFI_ALL_FAMILIES 0
207 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
208 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
209 
210 union pn533_cmd_poll_initdata {
211         struct {
212                 u8 afi;
213                 u8 polling_method;
214         } __packed type_b;
215         struct {
216                 u8 opcode;
217                 __be16 sc;
218                 u8 rc;
219                 u8 tsn;
220         } __packed felica;
221 };
222 
223 /* Poll modulations */
224 enum {
225         PN533_POLL_MOD_106KBPS_A,
226         PN533_POLL_MOD_212KBPS_FELICA,
227         PN533_POLL_MOD_424KBPS_FELICA,
228         PN533_POLL_MOD_106KBPS_JEWEL,
229         PN533_POLL_MOD_847KBPS_B,
230         PN533_LISTEN_MOD,
231 
232         __PN533_POLL_MOD_AFTER_LAST,
233 };
234 #define PN533_POLL_MOD_MAX (__PN533_POLL_MOD_AFTER_LAST - 1)
235 
236 struct pn533_poll_modulations {
237         struct {
238                 u8 maxtg;
239                 u8 brty;
240                 union pn533_cmd_poll_initdata initiator_data;
241         } __packed data;
242         u8 len;
243 };
244 
245 static const struct pn533_poll_modulations poll_mod[] = {
246         [PN533_POLL_MOD_106KBPS_A] = {
247                 .data = {
248                         .maxtg = 1,
249                         .brty = 0,
250                 },
251                 .len = 2,
252         },
253         [PN533_POLL_MOD_212KBPS_FELICA] = {
254                 .data = {
255                         .maxtg = 1,
256                         .brty = 1,
257                         .initiator_data.felica = {
258                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
259                                 .sc = PN533_FELICA_SENSF_SC_ALL,
260                                 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
261                                 .tsn = 0x03,
262                         },
263                 },
264                 .len = 7,
265         },
266         [PN533_POLL_MOD_424KBPS_FELICA] = {
267                 .data = {
268                         .maxtg = 1,
269                         .brty = 2,
270                         .initiator_data.felica = {
271                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
272                                 .sc = PN533_FELICA_SENSF_SC_ALL,
273                                 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
274                                 .tsn = 0x03,
275                         },
276                  },
277                 .len = 7,
278         },
279         [PN533_POLL_MOD_106KBPS_JEWEL] = {
280                 .data = {
281                         .maxtg = 1,
282                         .brty = 4,
283                 },
284                 .len = 2,
285         },
286         [PN533_POLL_MOD_847KBPS_B] = {
287                 .data = {
288                         .maxtg = 1,
289                         .brty = 8,
290                         .initiator_data.type_b = {
291                                 .afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
292                                 .polling_method =
293                                         PN533_TYPE_B_POLL_METHOD_TIMESLOT,
294                         },
295                 },
296                 .len = 3,
297         },
298         [PN533_LISTEN_MOD] = {
299                 .len = 0,
300         },
301 };
302 
303 /* PN533_CMD_IN_ATR */
304 
305 struct pn533_cmd_activate_response {
306         u8 status;
307         u8 nfcid3t[10];
308         u8 didt;
309         u8 bst;
310         u8 brt;
311         u8 to;
312         u8 ppt;
313         /* optional */
314         u8 gt[];
315 } __packed;
316 
317 struct pn533_cmd_jump_dep_response {
318         u8 status;
319         u8 tg;
320         u8 nfcid3t[10];
321         u8 didt;
322         u8 bst;
323         u8 brt;
324         u8 to;
325         u8 ppt;
326         /* optional */
327         u8 gt[];
328 } __packed;
329 
330 
331 /* PN533_TG_INIT_AS_TARGET */
332 #define PN533_INIT_TARGET_PASSIVE 0x1
333 #define PN533_INIT_TARGET_DEP 0x2
334 
335 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
336 #define PN533_INIT_TARGET_RESP_ACTIVE     0x1
337 #define PN533_INIT_TARGET_RESP_DEP        0x4
338 
339 enum  pn533_protocol_type {
340         PN533_PROTO_REQ_ACK_RESP = 0,
341         PN533_PROTO_REQ_RESP
342 };
343 
344 struct pn533 {
345         struct usb_device *udev;
346         struct usb_interface *interface;
347         struct nfc_dev *nfc_dev;
348         u32 device_type;
349         enum pn533_protocol_type protocol_type;
350 
351         struct urb *out_urb;
352         struct urb *in_urb;
353 
354         struct sk_buff_head resp_q;
355         struct sk_buff_head fragment_skb;
356 
357         struct workqueue_struct *wq;
358         struct work_struct cmd_work;
359         struct work_struct cmd_complete_work;
360         struct delayed_work poll_work;
361         struct work_struct mi_rx_work;
362         struct work_struct mi_tx_work;
363         struct work_struct mi_tm_rx_work;
364         struct work_struct mi_tm_tx_work;
365         struct work_struct tg_work;
366         struct work_struct rf_work;
367 
368         struct list_head cmd_queue;
369         struct pn533_cmd *cmd;
370         u8 cmd_pending;
371         struct mutex cmd_lock;  /* protects cmd queue */
372 
373         void *cmd_complete_mi_arg;
374         void *cmd_complete_dep_arg;
375 
376         struct pn533_poll_modulations *poll_mod_active[PN533_POLL_MOD_MAX + 1];
377         u8 poll_mod_count;
378         u8 poll_mod_curr;
379         u8 poll_dep;
380         u32 poll_protocols;
381         u32 listen_protocols;
382         struct timer_list listen_timer;
383         int cancel_listen;
384 
385         u8 *gb;
386         size_t gb_len;
387 
388         u8 tgt_available_prots;
389         u8 tgt_active_prot;
390         u8 tgt_mode;
391 
392         struct pn533_frame_ops *ops;
393 };
394 
395 struct pn533_cmd {
396         struct list_head queue;
397         u8 code;
398         int status;
399         struct sk_buff *req;
400         struct sk_buff *resp;
401         int resp_len;
402         pn533_send_async_complete_t  complete_cb;
403         void *complete_cb_context;
404 };
405 
406 struct pn533_std_frame {
407         u8 preamble;
408         __be16 start_frame;
409         u8 datalen;
410         u8 datalen_checksum;
411         u8 data[];
412 } __packed;
413 
414 struct pn533_ext_frame {        /* Extended Information frame */
415         u8 preamble;
416         __be16 start_frame;
417         __be16 eif_flag;        /* fixed to 0xFFFF */
418         __be16 datalen;
419         u8 datalen_checksum;
420         u8 data[];
421 } __packed;
422 
423 struct pn533_frame_ops {
424         void (*tx_frame_init)(void *frame, u8 cmd_code);
425         void (*tx_frame_finish)(void *frame);
426         void (*tx_update_payload_len)(void *frame, int len);
427         int tx_header_len;
428         int tx_tail_len;
429 
430         bool (*rx_is_frame_valid)(void *frame, struct pn533 *dev);
431         int (*rx_frame_size)(void *frame);
432         int rx_header_len;
433         int rx_tail_len;
434 
435         int max_payload_len;
436         u8 (*get_cmd_code)(void *frame);
437 };
438 
439 struct pn533_acr122_ccid_hdr {
440         u8 type;
441         u32 datalen;
442         u8 slot;
443         u8 seq;
444         u8 params[3]; /* 3 msg specific bytes or status, error and 1 specific
445                          byte for reposnse msg */
446         u8 data[]; /* payload */
447 } __packed;
448 
449 struct pn533_acr122_apdu_hdr {
450         u8 class;
451         u8 ins;
452         u8 p1;
453         u8 p2;
454 } __packed;
455 
456 struct pn533_acr122_tx_frame {
457         struct pn533_acr122_ccid_hdr ccid;
458         struct pn533_acr122_apdu_hdr apdu;
459         u8 datalen;
460         u8 data[]; /* pn533 frame: TFI ... */
461 } __packed;
462 
463 struct pn533_acr122_rx_frame {
464         struct pn533_acr122_ccid_hdr ccid;
465         u8 data[]; /* pn533 frame : TFI ... */
466 } __packed;
467 
468 static void pn533_acr122_tx_frame_init(void *_frame, u8 cmd_code)
469 {
470         struct pn533_acr122_tx_frame *frame = _frame;
471 
472         frame->ccid.type = PN533_ACR122_PC_TO_RDR_ESCAPE;
473         frame->ccid.datalen = sizeof(frame->apdu) + 1; /* sizeof(apdu_hdr) +
474                                                           sizeof(datalen) */
475         frame->ccid.slot = 0;
476         frame->ccid.seq = 0;
477         frame->ccid.params[0] = 0;
478         frame->ccid.params[1] = 0;
479         frame->ccid.params[2] = 0;
480 
481         frame->data[0] = PN533_STD_FRAME_DIR_OUT;
482         frame->data[1] = cmd_code;
483         frame->datalen = 2;  /* data[0] + data[1] */
484 
485         frame->apdu.class = 0xFF;
486         frame->apdu.ins = 0;
487         frame->apdu.p1 = 0;
488         frame->apdu.p2 = 0;
489 }
490 
491 static void pn533_acr122_tx_frame_finish(void *_frame)
492 {
493         struct pn533_acr122_tx_frame *frame = _frame;
494 
495         frame->ccid.datalen += frame->datalen;
496 }
497 
498 static void pn533_acr122_tx_update_payload_len(void *_frame, int len)
499 {
500         struct pn533_acr122_tx_frame *frame = _frame;
501 
502         frame->datalen += len;
503 }
504 
505 static bool pn533_acr122_is_rx_frame_valid(void *_frame, struct pn533 *dev)
506 {
507         struct pn533_acr122_rx_frame *frame = _frame;
508 
509         if (frame->ccid.type != 0x83)
510                 return false;
511 
512         if (!frame->ccid.datalen)
513                 return false;
514 
515         if (frame->data[frame->ccid.datalen - 2] == 0x63)
516                 return false;
517 
518         return true;
519 }
520 
521 static int pn533_acr122_rx_frame_size(void *frame)
522 {
523         struct pn533_acr122_rx_frame *f = frame;
524 
525         /* f->ccid.datalen already includes tail length */
526         return sizeof(struct pn533_acr122_rx_frame) + f->ccid.datalen;
527 }
528 
529 static u8 pn533_acr122_get_cmd_code(void *frame)
530 {
531         struct pn533_acr122_rx_frame *f = frame;
532 
533         return PN533_FRAME_CMD(f);
534 }
535 
536 static struct pn533_frame_ops pn533_acr122_frame_ops = {
537         .tx_frame_init = pn533_acr122_tx_frame_init,
538         .tx_frame_finish = pn533_acr122_tx_frame_finish,
539         .tx_update_payload_len = pn533_acr122_tx_update_payload_len,
540         .tx_header_len = PN533_ACR122_TX_FRAME_HEADER_LEN,
541         .tx_tail_len = PN533_ACR122_TX_FRAME_TAIL_LEN,
542 
543         .rx_is_frame_valid = pn533_acr122_is_rx_frame_valid,
544         .rx_header_len = PN533_ACR122_RX_FRAME_HEADER_LEN,
545         .rx_tail_len = PN533_ACR122_RX_FRAME_TAIL_LEN,
546         .rx_frame_size = pn533_acr122_rx_frame_size,
547 
548         .max_payload_len = PN533_ACR122_FRAME_MAX_PAYLOAD_LEN,
549         .get_cmd_code = pn533_acr122_get_cmd_code,
550 };
551 
552 /* The rule: value(high byte) + value(low byte) + checksum = 0 */
553 static inline u8 pn533_ext_checksum(u16 value)
554 {
555         return ~(u8)(((value & 0xFF00) >> 8) + (u8)(value & 0xFF)) + 1;
556 }
557 
558 /* The rule: value + checksum = 0 */
559 static inline u8 pn533_std_checksum(u8 value)
560 {
561         return ~value + 1;
562 }
563 
564 /* The rule: sum(data elements) + checksum = 0 */
565 static u8 pn533_std_data_checksum(u8 *data, int datalen)
566 {
567         u8 sum = 0;
568         int i;
569 
570         for (i = 0; i < datalen; i++)
571                 sum += data[i];
572 
573         return pn533_std_checksum(sum);
574 }
575 
576 static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code)
577 {
578         struct pn533_std_frame *frame = _frame;
579 
580         frame->preamble = 0;
581         frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF);
582         PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT;
583         PN533_FRAME_CMD(frame) = cmd_code;
584         frame->datalen = 2;
585 }
586 
587 static void pn533_std_tx_frame_finish(void *_frame)
588 {
589         struct pn533_std_frame *frame = _frame;
590 
591         frame->datalen_checksum = pn533_std_checksum(frame->datalen);
592 
593         PN533_STD_FRAME_CHECKSUM(frame) =
594                 pn533_std_data_checksum(frame->data, frame->datalen);
595 
596         PN533_STD_FRAME_POSTAMBLE(frame) = 0;
597 }
598 
599 static void pn533_std_tx_update_payload_len(void *_frame, int len)
600 {
601         struct pn533_std_frame *frame = _frame;
602 
603         frame->datalen += len;
604 }
605 
606 static bool pn533_std_rx_frame_is_valid(void *_frame, struct pn533 *dev)
607 {
608         u8 checksum;
609         struct pn533_std_frame *stdf = _frame;
610 
611         if (stdf->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
612                 return false;
613 
614         if (likely(!PN533_STD_IS_EXTENDED(stdf))) {
615                 /* Standard frame code */
616                 dev->ops->rx_header_len = PN533_STD_FRAME_HEADER_LEN;
617 
618                 checksum = pn533_std_checksum(stdf->datalen);
619                 if (checksum != stdf->datalen_checksum)
620                         return false;
621 
622                 checksum = pn533_std_data_checksum(stdf->data, stdf->datalen);
623                 if (checksum != PN533_STD_FRAME_CHECKSUM(stdf))
624                         return false;
625         } else {
626                 /* Extended */
627                 struct pn533_ext_frame *eif = _frame;
628 
629                 dev->ops->rx_header_len = PN533_EXT_FRAME_HEADER_LEN;
630 
631                 checksum = pn533_ext_checksum(be16_to_cpu(eif->datalen));
632                 if (checksum != eif->datalen_checksum)
633                         return false;
634 
635                 /* check data checksum */
636                 checksum = pn533_std_data_checksum(eif->data,
637                                                    be16_to_cpu(eif->datalen));
638                 if (checksum != PN533_EXT_FRAME_CHECKSUM(eif))
639                         return false;
640         }
641 
642         return true;
643 }
644 
645 static bool pn533_std_rx_frame_is_ack(struct pn533_std_frame *frame)
646 {
647         if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
648                 return false;
649 
650         if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
651                 return false;
652 
653         return true;
654 }
655 
656 static inline int pn533_std_rx_frame_size(void *frame)
657 {
658         struct pn533_std_frame *f = frame;
659 
660         /* check for Extended Information frame */
661         if (PN533_STD_IS_EXTENDED(f)) {
662                 struct pn533_ext_frame *eif = frame;
663 
664                 return sizeof(struct pn533_ext_frame)
665                         + be16_to_cpu(eif->datalen) + PN533_STD_FRAME_TAIL_LEN;
666         }
667 
668         return sizeof(struct pn533_std_frame) + f->datalen +
669                PN533_STD_FRAME_TAIL_LEN;
670 }
671 
672 static u8 pn533_std_get_cmd_code(void *frame)
673 {
674         struct pn533_std_frame *f = frame;
675         struct pn533_ext_frame *eif = frame;
676 
677         if (PN533_STD_IS_EXTENDED(f))
678                 return PN533_FRAME_CMD(eif);
679         else
680                 return PN533_FRAME_CMD(f);
681 }
682 
683 static struct pn533_frame_ops pn533_std_frame_ops = {
684         .tx_frame_init = pn533_std_tx_frame_init,
685         .tx_frame_finish = pn533_std_tx_frame_finish,
686         .tx_update_payload_len = pn533_std_tx_update_payload_len,
687         .tx_header_len = PN533_STD_FRAME_HEADER_LEN,
688         .tx_tail_len = PN533_STD_FRAME_TAIL_LEN,
689 
690         .rx_is_frame_valid = pn533_std_rx_frame_is_valid,
691         .rx_frame_size = pn533_std_rx_frame_size,
692         .rx_header_len = PN533_STD_FRAME_HEADER_LEN,
693         .rx_tail_len = PN533_STD_FRAME_TAIL_LEN,
694 
695         .max_payload_len =  PN533_STD_FRAME_MAX_PAYLOAD_LEN,
696         .get_cmd_code = pn533_std_get_cmd_code,
697 };
698 
699 static bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
700 {
701         return (dev->ops->get_cmd_code(frame) ==
702                                 PN533_CMD_RESPONSE(dev->cmd->code));
703 }
704 
705 static void pn533_recv_response(struct urb *urb)
706 {
707         struct pn533 *dev = urb->context;
708         struct pn533_cmd *cmd = dev->cmd;
709         u8 *in_frame;
710 
711         cmd->status = urb->status;
712 
713         switch (urb->status) {
714         case 0:
715                 break; /* success */
716         case -ECONNRESET:
717         case -ENOENT:
718                 dev_dbg(&dev->interface->dev,
719                         "The urb has been canceled (status %d)\n",
720                         urb->status);
721                 goto sched_wq;
722         case -ESHUTDOWN:
723         default:
724                 nfc_err(&dev->interface->dev,
725                         "Urb failure (status %d)\n", urb->status);
726                 goto sched_wq;
727         }
728 
729         in_frame = dev->in_urb->transfer_buffer;
730 
731         dev_dbg(&dev->interface->dev, "Received a frame\n");
732         print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, in_frame,
733                              dev->ops->rx_frame_size(in_frame), false);
734 
735         if (!dev->ops->rx_is_frame_valid(in_frame, dev)) {
736                 nfc_err(&dev->interface->dev, "Received an invalid frame\n");
737                 cmd->status = -EIO;
738                 goto sched_wq;
739         }
740 
741         if (!pn533_rx_frame_is_cmd_response(dev, in_frame)) {
742                 nfc_err(&dev->interface->dev,
743                         "It it not the response to the last command\n");
744                 cmd->status = -EIO;
745                 goto sched_wq;
746         }
747 
748 sched_wq:
749         queue_work(dev->wq, &dev->cmd_complete_work);
750 }
751 
752 static int pn533_submit_urb_for_response(struct pn533 *dev, gfp_t flags)
753 {
754         dev->in_urb->complete = pn533_recv_response;
755 
756         return usb_submit_urb(dev->in_urb, flags);
757 }
758 
759 static void pn533_recv_ack(struct urb *urb)
760 {
761         struct pn533 *dev = urb->context;
762         struct pn533_cmd *cmd = dev->cmd;
763         struct pn533_std_frame *in_frame;
764         int rc;
765 
766         cmd->status = urb->status;
767 
768         switch (urb->status) {
769         case 0:
770                 break; /* success */
771         case -ECONNRESET:
772         case -ENOENT:
773                 dev_dbg(&dev->interface->dev,
774                         "The urb has been stopped (status %d)\n",
775                         urb->status);
776                 goto sched_wq;
777         case -ESHUTDOWN:
778         default:
779                 nfc_err(&dev->interface->dev,
780                         "Urb failure (status %d)\n", urb->status);
781                 goto sched_wq;
782         }
783 
784         in_frame = dev->in_urb->transfer_buffer;
785 
786         if (!pn533_std_rx_frame_is_ack(in_frame)) {
787                 nfc_err(&dev->interface->dev, "Received an invalid ack\n");
788                 cmd->status = -EIO;
789                 goto sched_wq;
790         }
791 
792         rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
793         if (rc) {
794                 nfc_err(&dev->interface->dev,
795                         "usb_submit_urb failed with result %d\n", rc);
796                 cmd->status = rc;
797                 goto sched_wq;
798         }
799 
800         return;
801 
802 sched_wq:
803         queue_work(dev->wq, &dev->cmd_complete_work);
804 }
805 
806 static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags)
807 {
808         dev->in_urb->complete = pn533_recv_ack;
809 
810         return usb_submit_urb(dev->in_urb, flags);
811 }
812 
813 static int pn533_send_ack(struct pn533 *dev, gfp_t flags)
814 {
815         u8 ack[PN533_STD_FRAME_ACK_SIZE] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
816         /* spec 7.1.1.3:  Preamble, SoPC (2), ACK Code (2), Postamble */
817         int rc;
818 
819         dev->out_urb->transfer_buffer = ack;
820         dev->out_urb->transfer_buffer_length = sizeof(ack);
821         rc = usb_submit_urb(dev->out_urb, flags);
822 
823         return rc;
824 }
825 
826 static int __pn533_send_frame_async(struct pn533 *dev,
827                                         struct sk_buff *out,
828                                         struct sk_buff *in,
829                                         int in_len)
830 {
831         int rc;
832 
833         dev->out_urb->transfer_buffer = out->data;
834         dev->out_urb->transfer_buffer_length = out->len;
835 
836         dev->in_urb->transfer_buffer = in->data;
837         dev->in_urb->transfer_buffer_length = in_len;
838 
839         print_hex_dump_debug("PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
840                              out->data, out->len, false);
841 
842         rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
843         if (rc)
844                 return rc;
845 
846         if (dev->protocol_type == PN533_PROTO_REQ_RESP) {
847                 /* request for response for sent packet directly */
848                 rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
849                 if (rc)
850                         goto error;
851         } else if (dev->protocol_type == PN533_PROTO_REQ_ACK_RESP) {
852                 /* request for ACK if that's the case */
853                 rc = pn533_submit_urb_for_ack(dev, GFP_KERNEL);
854                 if (rc)
855                         goto error;
856         }
857 
858         return 0;
859 
860 error:
861         usb_unlink_urb(dev->out_urb);
862         return rc;
863 }
864 
865 static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
866                                   struct sk_buff *skb)
867 {
868         /* payload is already there, just update datalen */
869         int payload_len = skb->len;
870         struct pn533_frame_ops *ops = dev->ops;
871 
872 
873         skb_push(skb, ops->tx_header_len);
874         skb_put(skb, ops->tx_tail_len);
875 
876         ops->tx_frame_init(skb->data, cmd_code);
877         ops->tx_update_payload_len(skb->data, payload_len);
878         ops->tx_frame_finish(skb->data);
879 }
880 
881 static int pn533_send_async_complete(struct pn533 *dev)
882 {
883         struct pn533_cmd *cmd = dev->cmd;
884         int status = cmd->status;
885 
886         struct sk_buff *req = cmd->req;
887         struct sk_buff *resp = cmd->resp;
888 
889         int rc;
890 
891         dev_kfree_skb(req);
892 
893         if (status < 0) {
894                 rc = cmd->complete_cb(dev, cmd->complete_cb_context,
895                                       ERR_PTR(status));
896                 dev_kfree_skb(resp);
897                 goto done;
898         }
899 
900         skb_put(resp, dev->ops->rx_frame_size(resp->data));
901         skb_pull(resp, dev->ops->rx_header_len);
902         skb_trim(resp, resp->len - dev->ops->rx_tail_len);
903 
904         rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp);
905 
906 done:
907         kfree(cmd);
908         dev->cmd = NULL;
909         return rc;
910 }
911 
912 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
913                               struct sk_buff *req, struct sk_buff *resp,
914                               int resp_len,
915                               pn533_send_async_complete_t complete_cb,
916                               void *complete_cb_context)
917 {
918         struct pn533_cmd *cmd;
919         int rc = 0;
920 
921         dev_dbg(&dev->interface->dev, "Sending command 0x%x\n", cmd_code);
922 
923         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
924         if (!cmd)
925                 return -ENOMEM;
926 
927         cmd->code = cmd_code;
928         cmd->req = req;
929         cmd->resp = resp;
930         cmd->resp_len = resp_len;
931         cmd->complete_cb = complete_cb;
932         cmd->complete_cb_context = complete_cb_context;
933 
934         pn533_build_cmd_frame(dev, cmd_code, req);
935 
936         mutex_lock(&dev->cmd_lock);
937 
938         if (!dev->cmd_pending) {
939                 rc = __pn533_send_frame_async(dev, req, resp, resp_len);
940                 if (rc)
941                         goto error;
942 
943                 dev->cmd_pending = 1;
944                 dev->cmd = cmd;
945                 goto unlock;
946         }
947 
948         dev_dbg(&dev->interface->dev, "%s Queueing command 0x%x\n",
949                 __func__, cmd_code);
950 
951         INIT_LIST_HEAD(&cmd->queue);
952         list_add_tail(&cmd->queue, &dev->cmd_queue);
953 
954         goto unlock;
955 
956 error:
957         kfree(cmd);
958 unlock:
959         mutex_unlock(&dev->cmd_lock);
960         return rc;
961 }
962 
963 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
964                                  struct sk_buff *req,
965                                  pn533_send_async_complete_t complete_cb,
966                                  void *complete_cb_context)
967 {
968         struct sk_buff *resp;
969         int rc;
970         int  resp_len = dev->ops->rx_header_len +
971                         dev->ops->max_payload_len +
972                         dev->ops->rx_tail_len;
973 
974         resp = nfc_alloc_recv_skb(resp_len, GFP_KERNEL);
975         if (!resp)
976                 return -ENOMEM;
977 
978         rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
979                                 complete_cb_context);
980         if (rc)
981                 dev_kfree_skb(resp);
982 
983         return rc;
984 }
985 
986 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
987                                 struct sk_buff *req,
988                                 pn533_send_async_complete_t complete_cb,
989                                 void *complete_cb_context)
990 {
991         struct sk_buff *resp;
992         int rc;
993         int  resp_len = dev->ops->rx_header_len +
994                         dev->ops->max_payload_len +
995                         dev->ops->rx_tail_len;
996 
997         resp = alloc_skb(resp_len, GFP_KERNEL);
998         if (!resp)
999                 return -ENOMEM;
1000 
1001         rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
1002                                 complete_cb_context);
1003         if (rc)
1004                 dev_kfree_skb(resp);
1005 
1006         return rc;
1007 }
1008 
1009 /*
1010  * pn533_send_cmd_direct_async
1011  *
1012  * The function sends a piority cmd directly to the chip omiting the cmd
1013  * queue. It's intended to be used by chaining mechanism of received responses
1014  * where the host has to request every single chunk of data before scheduling
1015  * next cmd from the queue.
1016  */
1017 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
1018                                        struct sk_buff *req,
1019                                        pn533_send_async_complete_t complete_cb,
1020                                        void *complete_cb_context)
1021 {
1022         struct sk_buff *resp;
1023         struct pn533_cmd *cmd;
1024         int rc;
1025         int resp_len = dev->ops->rx_header_len +
1026                        dev->ops->max_payload_len +
1027                        dev->ops->rx_tail_len;
1028 
1029         resp = alloc_skb(resp_len, GFP_KERNEL);
1030         if (!resp)
1031                 return -ENOMEM;
1032 
1033         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
1034         if (!cmd) {
1035                 dev_kfree_skb(resp);
1036                 return -ENOMEM;
1037         }
1038 
1039         cmd->code = cmd_code;
1040         cmd->req = req;
1041         cmd->resp = resp;
1042         cmd->resp_len = resp_len;
1043         cmd->complete_cb = complete_cb;
1044         cmd->complete_cb_context = complete_cb_context;
1045 
1046         pn533_build_cmd_frame(dev, cmd_code, req);
1047 
1048         rc = __pn533_send_frame_async(dev, req, resp, resp_len);
1049         if (rc < 0) {
1050                 dev_kfree_skb(resp);
1051                 kfree(cmd);
1052         } else {
1053                 dev->cmd = cmd;
1054         }
1055 
1056         return rc;
1057 }
1058 
1059 static void pn533_wq_cmd_complete(struct work_struct *work)
1060 {
1061         struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
1062         int rc;
1063 
1064         rc = pn533_send_async_complete(dev);
1065         if (rc != -EINPROGRESS)
1066                 queue_work(dev->wq, &dev->cmd_work);
1067 }
1068 
1069 static void pn533_wq_cmd(struct work_struct *work)
1070 {
1071         struct pn533 *dev = container_of(work, struct pn533, cmd_work);
1072         struct pn533_cmd *cmd;
1073         int rc;
1074 
1075         mutex_lock(&dev->cmd_lock);
1076 
1077         if (list_empty(&dev->cmd_queue)) {
1078                 dev->cmd_pending = 0;
1079                 mutex_unlock(&dev->cmd_lock);
1080                 return;
1081         }
1082 
1083         cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
1084 
1085         list_del(&cmd->queue);
1086 
1087         mutex_unlock(&dev->cmd_lock);
1088 
1089         rc = __pn533_send_frame_async(dev, cmd->req, cmd->resp, cmd->resp_len);
1090         if (rc < 0) {
1091                 dev_kfree_skb(cmd->req);
1092                 dev_kfree_skb(cmd->resp);
1093                 kfree(cmd);
1094                 return;
1095         }
1096 
1097         dev->cmd = cmd;
1098 }
1099 
1100 struct pn533_sync_cmd_response {
1101         struct sk_buff *resp;
1102         struct completion done;
1103 };
1104 
1105 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
1106                                     struct sk_buff *resp)
1107 {
1108         struct pn533_sync_cmd_response *arg = _arg;
1109 
1110         arg->resp = resp;
1111         complete(&arg->done);
1112 
1113         return 0;
1114 }
1115 
1116 /*  pn533_send_cmd_sync
1117  *
1118  *  Please note the req parameter is freed inside the function to
1119  *  limit a number of return value interpretations by the caller.
1120  *
1121  *  1. negative in case of error during TX path -> req should be freed
1122  *
1123  *  2. negative in case of error during RX path -> req should not be freed
1124  *     as it's been already freed at the begining of RX path by
1125  *     async_complete_cb.
1126  *
1127  *  3. valid pointer in case of succesfult RX path
1128  *
1129  *  A caller has to check a return value with IS_ERR macro. If the test pass,
1130  *  the returned pointer is valid.
1131  *
1132  * */
1133 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
1134                                                struct sk_buff *req)
1135 {
1136         int rc;
1137         struct pn533_sync_cmd_response arg;
1138 
1139         init_completion(&arg.done);
1140 
1141         rc = pn533_send_cmd_async(dev, cmd_code, req,
1142                                   pn533_send_sync_complete, &arg);
1143         if (rc) {
1144                 dev_kfree_skb(req);
1145                 return ERR_PTR(rc);
1146         }
1147 
1148         wait_for_completion(&arg.done);
1149 
1150         return arg.resp;
1151 }
1152 
1153 static void pn533_send_complete(struct urb *urb)
1154 {
1155         struct pn533 *dev = urb->context;
1156 
1157         switch (urb->status) {
1158         case 0:
1159                 break; /* success */
1160         case -ECONNRESET:
1161         case -ENOENT:
1162                 dev_dbg(&dev->interface->dev,
1163                         "The urb has been stopped (status %d)\n",
1164                         urb->status);
1165                 break;
1166         case -ESHUTDOWN:
1167         default:
1168                 nfc_err(&dev->interface->dev, "Urb failure (status %d)\n",
1169                         urb->status);
1170         }
1171 }
1172 
1173 static void pn533_abort_cmd(struct pn533 *dev, gfp_t flags)
1174 {
1175         /* ACR122U does not support any command which aborts last
1176          * issued command i.e. as ACK for standard PN533. Additionally,
1177          * it behaves stange, sending broken or incorrect responses,
1178          * when we cancel urb before the chip will send response.
1179          */
1180         if (dev->device_type == PN533_DEVICE_ACR122U)
1181                 return;
1182 
1183         /* An ack will cancel the last issued command */
1184         pn533_send_ack(dev, flags);
1185 
1186         /* cancel the urb request */
1187         usb_kill_urb(dev->in_urb);
1188 }
1189 
1190 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
1191 {
1192         struct sk_buff *skb;
1193 
1194         skb = alloc_skb(dev->ops->tx_header_len +
1195                         size +
1196                         dev->ops->tx_tail_len, GFP_KERNEL);
1197 
1198         if (skb)
1199                 skb_reserve(skb, dev->ops->tx_header_len);
1200 
1201         return skb;
1202 }
1203 
1204 struct pn533_target_type_a {
1205         __be16 sens_res;
1206         u8 sel_res;
1207         u8 nfcid_len;
1208         u8 nfcid_data[];
1209 } __packed;
1210 
1211 
1212 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
1213 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
1214 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
1215 
1216 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
1217 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
1218 
1219 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
1220 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
1221 
1222 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
1223 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
1224 #define PN533_TYPE_A_SEL_PROT_DEP 2
1225 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
1226 
1227 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
1228                                                         int target_data_len)
1229 {
1230         u8 ssd;
1231         u8 platconf;
1232 
1233         if (target_data_len < sizeof(struct pn533_target_type_a))
1234                 return false;
1235 
1236         /* The lenght check of nfcid[] and ats[] are not being performed because
1237            the values are not being used */
1238 
1239         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1240         ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
1241         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
1242 
1243         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1244              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1245             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1246              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1247                 return false;
1248 
1249         /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
1250         if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
1251                 return false;
1252 
1253         return true;
1254 }
1255 
1256 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
1257                                                         int tgt_data_len)
1258 {
1259         struct pn533_target_type_a *tgt_type_a;
1260 
1261         tgt_type_a = (struct pn533_target_type_a *)tgt_data;
1262 
1263         if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
1264                 return -EPROTO;
1265 
1266         switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
1267         case PN533_TYPE_A_SEL_PROT_MIFARE:
1268                 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
1269                 break;
1270         case PN533_TYPE_A_SEL_PROT_ISO14443:
1271                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
1272                 break;
1273         case PN533_TYPE_A_SEL_PROT_DEP:
1274                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1275                 break;
1276         case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
1277                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
1278                                                         NFC_PROTO_NFC_DEP_MASK;
1279                 break;
1280         }
1281 
1282         nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
1283         nfc_tgt->sel_res = tgt_type_a->sel_res;
1284         nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
1285         memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
1286 
1287         return 0;
1288 }
1289 
1290 struct pn533_target_felica {
1291         u8 pol_res;
1292         u8 opcode;
1293         u8 nfcid2[NFC_NFCID2_MAXSIZE];
1294         u8 pad[8];
1295         /* optional */
1296         u8 syst_code[];
1297 } __packed;
1298 
1299 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
1300 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
1301 
1302 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
1303                                                         int target_data_len)
1304 {
1305         if (target_data_len < sizeof(struct pn533_target_felica))
1306                 return false;
1307 
1308         if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
1309                 return false;
1310 
1311         return true;
1312 }
1313 
1314 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
1315                                                         int tgt_data_len)
1316 {
1317         struct pn533_target_felica *tgt_felica;
1318 
1319         tgt_felica = (struct pn533_target_felica *)tgt_data;
1320 
1321         if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
1322                 return -EPROTO;
1323 
1324         if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
1325             (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
1326                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1327         else
1328                 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
1329 
1330         memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
1331         nfc_tgt->sensf_res_len = 9;
1332 
1333         memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
1334         nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
1335 
1336         return 0;
1337 }
1338 
1339 struct pn533_target_jewel {
1340         __be16 sens_res;
1341         u8 jewelid[4];
1342 } __packed;
1343 
1344 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
1345                                                         int target_data_len)
1346 {
1347         u8 ssd;
1348         u8 platconf;
1349 
1350         if (target_data_len < sizeof(struct pn533_target_jewel))
1351                 return false;
1352 
1353         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1354         ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
1355         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
1356 
1357         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1358              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1359             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1360              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1361                 return false;
1362 
1363         return true;
1364 }
1365 
1366 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
1367                                                         int tgt_data_len)
1368 {
1369         struct pn533_target_jewel *tgt_jewel;
1370 
1371         tgt_jewel = (struct pn533_target_jewel *)tgt_data;
1372 
1373         if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
1374                 return -EPROTO;
1375 
1376         nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
1377         nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
1378         nfc_tgt->nfcid1_len = 4;
1379         memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
1380 
1381         return 0;
1382 }
1383 
1384 struct pn533_type_b_prot_info {
1385         u8 bitrate;
1386         u8 fsci_type;
1387         u8 fwi_adc_fo;
1388 } __packed;
1389 
1390 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
1391 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
1392 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
1393 
1394 struct pn533_type_b_sens_res {
1395         u8 opcode;
1396         u8 nfcid[4];
1397         u8 appdata[4];
1398         struct pn533_type_b_prot_info prot_info;
1399 } __packed;
1400 
1401 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
1402 
1403 struct pn533_target_type_b {
1404         struct pn533_type_b_sens_res sensb_res;
1405         u8 attrib_res_len;
1406         u8 attrib_res[];
1407 } __packed;
1408 
1409 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
1410                                                         int target_data_len)
1411 {
1412         if (target_data_len < sizeof(struct pn533_target_type_b))
1413                 return false;
1414 
1415         if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
1416                 return false;
1417 
1418         if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
1419                                                 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
1420                 return false;
1421 
1422         return true;
1423 }
1424 
1425 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
1426                                                         int tgt_data_len)
1427 {
1428         struct pn533_target_type_b *tgt_type_b;
1429 
1430         tgt_type_b = (struct pn533_target_type_b *)tgt_data;
1431 
1432         if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
1433                 return -EPROTO;
1434 
1435         nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
1436 
1437         return 0;
1438 }
1439 
1440 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
1441                               int tgdata_len)
1442 {
1443         struct nfc_target nfc_tgt;
1444         int rc;
1445 
1446         dev_dbg(&dev->interface->dev, "%s: modulation=%d\n",
1447                 __func__, dev->poll_mod_curr);
1448 
1449         if (tg != 1)
1450                 return -EPROTO;
1451 
1452         memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1453 
1454         switch (dev->poll_mod_curr) {
1455         case PN533_POLL_MOD_106KBPS_A:
1456                 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
1457                 break;
1458         case PN533_POLL_MOD_212KBPS_FELICA:
1459         case PN533_POLL_MOD_424KBPS_FELICA:
1460                 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
1461                 break;
1462         case PN533_POLL_MOD_106KBPS_JEWEL:
1463                 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
1464                 break;
1465         case PN533_POLL_MOD_847KBPS_B:
1466                 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
1467                 break;
1468         default:
1469                 nfc_err(&dev->interface->dev,
1470                         "Unknown current poll modulation\n");
1471                 return -EPROTO;
1472         }
1473 
1474         if (rc)
1475                 return rc;
1476 
1477         if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1478                 dev_dbg(&dev->interface->dev,
1479                         "The Tg found doesn't have the desired protocol\n");
1480                 return -EAGAIN;
1481         }
1482 
1483         dev_dbg(&dev->interface->dev,
1484                 "Target found - supported protocols: 0x%x\n",
1485                 nfc_tgt.supported_protocols);
1486 
1487         dev->tgt_available_prots = nfc_tgt.supported_protocols;
1488 
1489         nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1490 
1491         return 0;
1492 }
1493 
1494 static inline void pn533_poll_next_mod(struct pn533 *dev)
1495 {
1496         dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
1497 }
1498 
1499 static void pn533_poll_reset_mod_list(struct pn533 *dev)
1500 {
1501         dev->poll_mod_count = 0;
1502 }
1503 
1504 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
1505 {
1506         dev->poll_mod_active[dev->poll_mod_count] =
1507                 (struct pn533_poll_modulations *)&poll_mod[mod_index];
1508         dev->poll_mod_count++;
1509 }
1510 
1511 static void pn533_poll_create_mod_list(struct pn533 *dev,
1512                                        u32 im_protocols, u32 tm_protocols)
1513 {
1514         pn533_poll_reset_mod_list(dev);
1515 
1516         if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
1517             (im_protocols & NFC_PROTO_ISO14443_MASK) ||
1518             (im_protocols & NFC_PROTO_NFC_DEP_MASK))
1519                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
1520 
1521         if (im_protocols & NFC_PROTO_FELICA_MASK ||
1522             im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1523                 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
1524                 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
1525         }
1526 
1527         if (im_protocols & NFC_PROTO_JEWEL_MASK)
1528                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
1529 
1530         if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1531                 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
1532 
1533         if (tm_protocols)
1534                 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
1535 }
1536 
1537 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
1538 {
1539         u8 nbtg, tg, *tgdata;
1540         int rc, tgdata_len;
1541 
1542         /* Toggle the DEP polling */
1543         dev->poll_dep = 1;
1544 
1545         nbtg = resp->data[0];
1546         tg = resp->data[1];
1547         tgdata = &resp->data[2];
1548         tgdata_len = resp->len - 2;  /* nbtg + tg */
1549 
1550         if (nbtg) {
1551                 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1552 
1553                 /* We must stop the poll after a valid target found */
1554                 if (rc == 0) {
1555                         pn533_poll_reset_mod_list(dev);
1556                         return 0;
1557                 }
1558         }
1559 
1560         return -EAGAIN;
1561 }
1562 
1563 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1564 {
1565         struct sk_buff *skb;
1566         u8 *felica, *nfcid3, *gb;
1567 
1568         u8 *gbytes = dev->gb;
1569         size_t gbytes_len = dev->gb_len;
1570 
1571         u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1572                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1573                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1574                                 0xff, 0xff}; /* System code */
1575 
1576         u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1577                                0x0, 0x0, 0x0,
1578                                0x40}; /* SEL_RES for DEP */
1579 
1580         unsigned int skb_len = 36 + /* mode (1), mifare (6),
1581                                        felica (18), nfcid3 (10), gb_len (1) */
1582                                gbytes_len +
1583                                1;  /* len Tk*/
1584 
1585         skb = pn533_alloc_skb(dev, skb_len);
1586         if (!skb)
1587                 return NULL;
1588 
1589         /* DEP support only */
1590         *skb_put(skb, 1) = PN533_INIT_TARGET_DEP;
1591 
1592         /* MIFARE params */
1593         memcpy(skb_put(skb, 6), mifare_params, 6);
1594 
1595         /* Felica params */
1596         felica = skb_put(skb, 18);
1597         memcpy(felica, felica_params, 18);
1598         get_random_bytes(felica + 2, 6);
1599 
1600         /* NFCID3 */
1601         nfcid3 = skb_put(skb, 10);
1602         memset(nfcid3, 0, 10);
1603         memcpy(nfcid3, felica, 8);
1604 
1605         /* General bytes */
1606         *skb_put(skb, 1) = gbytes_len;
1607 
1608         gb = skb_put(skb, gbytes_len);
1609         memcpy(gb, gbytes, gbytes_len);
1610 
1611         /* Len Tk */
1612         *skb_put(skb, 1) = 0;
1613 
1614         return skb;
1615 }
1616 
1617 #define PN533_CMD_DATAEXCH_HEAD_LEN 1
1618 #define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
1619 static void pn533_wq_tm_mi_recv(struct work_struct *work);
1620 static struct sk_buff *pn533_build_response(struct pn533 *dev);
1621 
1622 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1623                                       struct sk_buff *resp)
1624 {
1625         struct sk_buff *skb;
1626         u8 status, ret, mi;
1627         int rc;
1628 
1629         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1630 
1631         if (IS_ERR(resp)) {
1632                 skb_queue_purge(&dev->resp_q);
1633                 return PTR_ERR(resp);
1634         }
1635 
1636         status = resp->data[0];
1637 
1638         ret = status & PN533_CMD_RET_MASK;
1639         mi = status & PN533_CMD_MI_MASK;
1640 
1641         skb_pull(resp, sizeof(status));
1642 
1643         if (ret != PN533_CMD_RET_SUCCESS) {
1644                 rc = -EIO;
1645                 goto error;
1646         }
1647 
1648         skb_queue_tail(&dev->resp_q, resp);
1649 
1650         if (mi) {
1651                 queue_work(dev->wq, &dev->mi_tm_rx_work);
1652                 return -EINPROGRESS;
1653         }
1654 
1655         skb = pn533_build_response(dev);
1656         if (!skb) {
1657                 rc = -EIO;
1658                 goto error;
1659         }
1660 
1661         return nfc_tm_data_received(dev->nfc_dev, skb);
1662 
1663 error:
1664         nfc_tm_deactivated(dev->nfc_dev);
1665         dev->tgt_mode = 0;
1666         skb_queue_purge(&dev->resp_q);
1667         dev_kfree_skb(resp);
1668 
1669         return rc;
1670 }
1671 
1672 static void pn533_wq_tm_mi_recv(struct work_struct *work)
1673 {
1674         struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work);
1675         struct sk_buff *skb;
1676         int rc;
1677 
1678         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1679 
1680         skb = pn533_alloc_skb(dev, 0);
1681         if (!skb)
1682                 return;
1683 
1684         rc = pn533_send_cmd_direct_async(dev,
1685                                         PN533_CMD_TG_GET_DATA,
1686                                         skb,
1687                                         pn533_tm_get_data_complete,
1688                                         NULL);
1689 
1690         if (rc < 0)
1691                 dev_kfree_skb(skb);
1692 
1693         return;
1694 }
1695 
1696 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
1697                                   struct sk_buff *resp);
1698 static void pn533_wq_tm_mi_send(struct work_struct *work)
1699 {
1700         struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
1701         struct sk_buff *skb;
1702         int rc;
1703 
1704         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1705 
1706         /* Grab the first skb in the queue */
1707         skb = skb_dequeue(&dev->fragment_skb);
1708         if (skb == NULL) {      /* No more data */
1709                 /* Reset the queue for future use */
1710                 skb_queue_head_init(&dev->fragment_skb);
1711                 goto error;
1712         }
1713 
1714         /* last entry - remove MI bit */
1715         if (skb_queue_len(&dev->fragment_skb) == 0) {
1716                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
1717                                         skb, pn533_tm_send_complete, NULL);
1718         } else
1719                 rc = pn533_send_cmd_direct_async(dev,
1720                                         PN533_CMD_TG_SET_META_DATA,
1721                                         skb, pn533_tm_send_complete, NULL);
1722 
1723         if (rc == 0) /* success */
1724                 return;
1725 
1726         dev_err(&dev->interface->dev,
1727                 "Error %d when trying to perform set meta data_exchange", rc);
1728 
1729         dev_kfree_skb(skb);
1730 
1731 error:
1732         pn533_send_ack(dev, GFP_KERNEL);
1733         queue_work(dev->wq, &dev->cmd_work);
1734 }
1735 
1736 static void pn533_wq_tg_get_data(struct work_struct *work)
1737 {
1738         struct pn533 *dev = container_of(work, struct pn533, tg_work);
1739         struct sk_buff *skb;
1740         int rc;
1741 
1742         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1743 
1744         skb = pn533_alloc_skb(dev, 0);
1745         if (!skb)
1746                 return;
1747 
1748         rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1749                                    pn533_tm_get_data_complete, NULL);
1750 
1751         if (rc < 0)
1752                 dev_kfree_skb(skb);
1753 
1754         return;
1755 }
1756 
1757 #define ATR_REQ_GB_OFFSET 17
1758 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1759 {
1760         u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1761         size_t gb_len;
1762         int rc;
1763 
1764         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1765 
1766         if (resp->len < ATR_REQ_GB_OFFSET + 1)
1767                 return -EINVAL;
1768 
1769         mode = resp->data[0];
1770         cmd = &resp->data[1];
1771 
1772         dev_dbg(&dev->interface->dev, "Target mode 0x%x len %d\n",
1773                 mode, resp->len);
1774 
1775         if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1776             PN533_INIT_TARGET_RESP_ACTIVE)
1777                 comm_mode = NFC_COMM_ACTIVE;
1778 
1779         if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0)  /* Only DEP supported */
1780                 return -EOPNOTSUPP;
1781 
1782         gb = cmd + ATR_REQ_GB_OFFSET;
1783         gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1784 
1785         rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1786                               comm_mode, gb, gb_len);
1787         if (rc < 0) {
1788                 nfc_err(&dev->interface->dev,
1789                         "Error when signaling target activation\n");
1790                 return rc;
1791         }
1792 
1793         dev->tgt_mode = 1;
1794         queue_work(dev->wq, &dev->tg_work);
1795 
1796         return 0;
1797 }
1798 
1799 static void pn533_listen_mode_timer(unsigned long data)
1800 {
1801         struct pn533 *dev = (struct pn533 *)data;
1802 
1803         dev_dbg(&dev->interface->dev, "Listen mode timeout\n");
1804 
1805         dev->cancel_listen = 1;
1806 
1807         pn533_poll_next_mod(dev);
1808 
1809         queue_delayed_work(dev->wq, &dev->poll_work,
1810                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1811 }
1812 
1813 static int pn533_rf_complete(struct pn533 *dev, void *arg,
1814                              struct sk_buff *resp)
1815 {
1816         int rc = 0;
1817 
1818         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1819 
1820         if (IS_ERR(resp)) {
1821                 rc = PTR_ERR(resp);
1822 
1823                 nfc_err(&dev->interface->dev, "RF setting error %d", rc);
1824 
1825                 return rc;
1826         }
1827 
1828         queue_delayed_work(dev->wq, &dev->poll_work,
1829                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1830 
1831         dev_kfree_skb(resp);
1832         return rc;
1833 }
1834 
1835 static void pn533_wq_rf(struct work_struct *work)
1836 {
1837         struct pn533 *dev = container_of(work, struct pn533, rf_work);
1838         struct sk_buff *skb;
1839         int rc;
1840 
1841         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1842 
1843         skb = pn533_alloc_skb(dev, 2);
1844         if (!skb)
1845                 return;
1846 
1847         *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD;
1848         *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
1849 
1850         rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1851                                   pn533_rf_complete, NULL);
1852         if (rc < 0) {
1853                 dev_kfree_skb(skb);
1854                 nfc_err(&dev->interface->dev, "RF setting error %d\n", rc);
1855         }
1856 
1857         return;
1858 }
1859 
1860 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg,
1861                                    struct sk_buff *resp)
1862 {
1863         struct pn533_cmd_jump_dep_response *rsp;
1864         struct nfc_target nfc_target;
1865         u8 target_gt_len;
1866         int rc;
1867 
1868         if (IS_ERR(resp))
1869                 return PTR_ERR(resp);
1870 
1871         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1872 
1873         rc = rsp->status & PN533_CMD_RET_MASK;
1874         if (rc != PN533_CMD_RET_SUCCESS) {
1875                 /* Not target found, turn radio off */
1876                 queue_work(dev->wq, &dev->rf_work);
1877 
1878                 dev_kfree_skb(resp);
1879                 return 0;
1880         }
1881 
1882         dev_dbg(&dev->interface->dev, "Creating new target");
1883 
1884         nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1885         nfc_target.nfcid1_len = 10;
1886         memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1887         rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1888         if (rc)
1889                 goto error;
1890 
1891         dev->tgt_available_prots = 0;
1892         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1893 
1894         /* ATR_RES general bytes are located at offset 17 */
1895         target_gt_len = resp->len - 17;
1896         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1897                                           rsp->gt, target_gt_len);
1898         if (!rc) {
1899                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1900                                         dev->nfc_dev->targets[0].idx,
1901                                         0, NFC_RF_INITIATOR);
1902 
1903                 if (!rc)
1904                         pn533_poll_reset_mod_list(dev);
1905         }
1906 error:
1907         dev_kfree_skb(resp);
1908         return rc;
1909 }
1910 
1911 #define PASSIVE_DATA_LEN 5
1912 static int pn533_poll_dep(struct nfc_dev *nfc_dev)
1913 {
1914         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1915         struct sk_buff *skb;
1916         int rc, skb_len;
1917         u8 *next, nfcid3[NFC_NFCID3_MAXSIZE];
1918         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1919 
1920         dev_dbg(&dev->interface->dev, "%s", __func__);
1921 
1922         if (!dev->gb) {
1923                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1924 
1925                 if (!dev->gb || !dev->gb_len) {
1926                         dev->poll_dep = 0;
1927                         queue_work(dev->wq, &dev->rf_work);
1928                 }
1929         }
1930 
1931         skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1932         skb_len += PASSIVE_DATA_LEN;
1933 
1934         /* NFCID3 */
1935         skb_len += NFC_NFCID3_MAXSIZE;
1936         nfcid3[0] = 0x1;
1937         nfcid3[1] = 0xfe;
1938         get_random_bytes(nfcid3 + 2, 6);
1939 
1940         skb = pn533_alloc_skb(dev, skb_len);
1941         if (!skb)
1942                 return -ENOMEM;
1943 
1944         *skb_put(skb, 1) = 0x01;  /* Active */
1945         *skb_put(skb, 1) = 0x02;  /* 424 kbps */
1946 
1947         next = skb_put(skb, 1);  /* Next */
1948         *next = 0;
1949 
1950         /* Copy passive data */
1951         memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
1952         *next |= 1;
1953 
1954         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1955         memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
1956                NFC_NFCID3_MAXSIZE);
1957         *next |= 2;
1958 
1959         memcpy(skb_put(skb, dev->gb_len), dev->gb, dev->gb_len);
1960         *next |= 4; /* We have some Gi */
1961 
1962         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1963                                   pn533_poll_dep_complete, NULL);
1964 
1965         if (rc < 0)
1966                 dev_kfree_skb(skb);
1967 
1968         return rc;
1969 }
1970 
1971 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1972                                struct sk_buff *resp)
1973 {
1974         struct pn533_poll_modulations *cur_mod;
1975         int rc;
1976 
1977         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1978 
1979         if (IS_ERR(resp)) {
1980                 rc = PTR_ERR(resp);
1981 
1982                 nfc_err(&dev->interface->dev, "%s  Poll complete error %d\n",
1983                         __func__, rc);
1984 
1985                 if (rc == -ENOENT) {
1986                         if (dev->poll_mod_count != 0)
1987                                 return rc;
1988                         else
1989                                 goto stop_poll;
1990                 } else if (rc < 0) {
1991                         nfc_err(&dev->interface->dev,
1992                                 "Error %d when running poll\n", rc);
1993                         goto stop_poll;
1994                 }
1995         }
1996 
1997         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1998 
1999         if (cur_mod->len == 0) { /* Target mode */
2000                 del_timer(&dev->listen_timer);
2001                 rc = pn533_init_target_complete(dev, resp);
2002                 goto done;
2003         }
2004 
2005         /* Initiator mode */
2006         rc = pn533_start_poll_complete(dev, resp);
2007         if (!rc)
2008                 goto done;
2009 
2010         if (!dev->poll_mod_count) {
2011                 dev_dbg(&dev->interface->dev, "Polling has been stopped\n");
2012                 goto done;
2013         }
2014 
2015         pn533_poll_next_mod(dev);
2016         /* Not target found, turn radio off */
2017         queue_work(dev->wq, &dev->rf_work);
2018 
2019 done:
2020         dev_kfree_skb(resp);
2021         return rc;
2022 
2023 stop_poll:
2024         nfc_err(&dev->interface->dev, "Polling operation has been stopped\n");
2025 
2026         pn533_poll_reset_mod_list(dev);
2027         dev->poll_protocols = 0;
2028         return rc;
2029 }
2030 
2031 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
2032                                         struct pn533_poll_modulations *mod)
2033 {
2034         struct sk_buff *skb;
2035 
2036         skb = pn533_alloc_skb(dev, mod->len);
2037         if (!skb)
2038                 return NULL;
2039 
2040         memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
2041 
2042         return skb;
2043 }
2044 
2045 static int pn533_send_poll_frame(struct pn533 *dev)
2046 {
2047         struct pn533_poll_modulations *mod;
2048         struct sk_buff *skb;
2049         int rc;
2050         u8 cmd_code;
2051 
2052         mod = dev->poll_mod_active[dev->poll_mod_curr];
2053 
2054         dev_dbg(&dev->interface->dev, "%s mod len %d\n",
2055                 __func__, mod->len);
2056 
2057         if (dev->poll_dep)  {
2058                 dev->poll_dep = 0;
2059                 return pn533_poll_dep(dev->nfc_dev);
2060         }
2061 
2062         if (mod->len == 0) {  /* Listen mode */
2063                 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
2064                 skb = pn533_alloc_poll_tg_frame(dev);
2065         } else {  /* Polling mode */
2066                 cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
2067                 skb = pn533_alloc_poll_in_frame(dev, mod);
2068         }
2069 
2070         if (!skb) {
2071                 nfc_err(&dev->interface->dev, "Failed to allocate skb\n");
2072                 return -ENOMEM;
2073         }
2074 
2075         rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
2076                                   NULL);
2077         if (rc < 0) {
2078                 dev_kfree_skb(skb);
2079                 nfc_err(&dev->interface->dev, "Polling loop error %d\n", rc);
2080         }
2081 
2082         return rc;
2083 }
2084 
2085 static void pn533_wq_poll(struct work_struct *work)
2086 {
2087         struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
2088         struct pn533_poll_modulations *cur_mod;
2089         int rc;
2090 
2091         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
2092 
2093         dev_dbg(&dev->interface->dev,
2094                 "%s cancel_listen %d modulation len %d\n",
2095                 __func__, dev->cancel_listen, cur_mod->len);
2096 
2097         if (dev->cancel_listen == 1) {
2098                 dev->cancel_listen = 0;
2099                 pn533_abort_cmd(dev, GFP_ATOMIC);
2100         }
2101 
2102         rc = pn533_send_poll_frame(dev);
2103         if (rc)
2104                 return;
2105 
2106         if (cur_mod->len == 0 && dev->poll_mod_count > 1)
2107                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
2108 
2109         return;
2110 }
2111 
2112 static int pn533_start_poll(struct nfc_dev *nfc_dev,
2113                             u32 im_protocols, u32 tm_protocols)
2114 {
2115         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2116         struct pn533_poll_modulations *cur_mod;
2117         u8 rand_mod;
2118         int rc;
2119 
2120         dev_dbg(&dev->interface->dev,
2121                 "%s: im protocols 0x%x tm protocols 0x%x\n",
2122                 __func__, im_protocols, tm_protocols);
2123 
2124         if (dev->tgt_active_prot) {
2125                 nfc_err(&dev->interface->dev,
2126                         "Cannot poll with a target already activated\n");
2127                 return -EBUSY;
2128         }
2129 
2130         if (dev->tgt_mode) {
2131                 nfc_err(&dev->interface->dev,
2132                         "Cannot poll while already being activated\n");
2133                 return -EBUSY;
2134         }
2135 
2136         if (tm_protocols) {
2137                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
2138                 if (dev->gb == NULL)
2139                         tm_protocols = 0;
2140         }
2141 
2142         pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
2143         dev->poll_protocols = im_protocols;
2144         dev->listen_protocols = tm_protocols;
2145 
2146         /* Do not always start polling from the same modulation */
2147         get_random_bytes(&rand_mod, sizeof(rand_mod));
2148         rand_mod %= dev->poll_mod_count;
2149         dev->poll_mod_curr = rand_mod;
2150 
2151         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
2152 
2153         rc = pn533_send_poll_frame(dev);
2154 
2155         /* Start listen timer */
2156         if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
2157                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
2158 
2159         return rc;
2160 }
2161 
2162 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
2163 {
2164         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2165 
2166         del_timer(&dev->listen_timer);
2167 
2168         if (!dev->poll_mod_count) {
2169                 dev_dbg(&dev->interface->dev,
2170                         "Polling operation was not running\n");
2171                 return;
2172         }
2173 
2174         pn533_abort_cmd(dev, GFP_KERNEL);
2175         flush_delayed_work(&dev->poll_work);
2176         pn533_poll_reset_mod_list(dev);
2177 }
2178 
2179 static int pn533_activate_target_nfcdep(struct pn533 *dev)
2180 {
2181         struct pn533_cmd_activate_response *rsp;
2182         u16 gt_len;
2183         int rc;
2184         struct sk_buff *skb;
2185         struct sk_buff *resp;
2186 
2187         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2188 
2189         skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
2190         if (!skb)
2191                 return -ENOMEM;
2192 
2193         *skb_put(skb, sizeof(u8)) = 1; /* TG */
2194         *skb_put(skb, sizeof(u8)) = 0; /* Next */
2195 
2196         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
2197         if (IS_ERR(resp))
2198                 return PTR_ERR(resp);
2199 
2200         rsp = (struct pn533_cmd_activate_response *)resp->data;
2201         rc = rsp->status & PN533_CMD_RET_MASK;
2202         if (rc != PN533_CMD_RET_SUCCESS) {
2203                 nfc_err(&dev->interface->dev,
2204                         "Target activation failed (error 0x%x)\n", rc);
2205                 dev_kfree_skb(resp);
2206                 return -EIO;
2207         }
2208 
2209         /* ATR_RES general bytes are located at offset 16 */
2210         gt_len = resp->len - 16;
2211         rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
2212 
2213         dev_kfree_skb(resp);
2214         return rc;
2215 }
2216 
2217 static int pn533_activate_target(struct nfc_dev *nfc_dev,
2218                                  struct nfc_target *target, u32 protocol)
2219 {
2220         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2221         int rc;
2222 
2223         dev_dbg(&dev->interface->dev, "%s: protocol=%u\n", __func__, protocol);
2224 
2225         if (dev->poll_mod_count) {
2226                 nfc_err(&dev->interface->dev,
2227                         "Cannot activate while polling\n");
2228                 return -EBUSY;
2229         }
2230 
2231         if (dev->tgt_active_prot) {
2232                 nfc_err(&dev->interface->dev,
2233                         "There is already an active target\n");
2234                 return -EBUSY;
2235         }
2236 
2237         if (!dev->tgt_available_prots) {
2238                 nfc_err(&dev->interface->dev,
2239                         "There is no available target to activate\n");
2240                 return -EINVAL;
2241         }
2242 
2243         if (!(dev->tgt_available_prots & (1 << protocol))) {
2244                 nfc_err(&dev->interface->dev,
2245                         "Target doesn't support requested proto %u\n",
2246                         protocol);
2247                 return -EINVAL;
2248         }
2249 
2250         if (protocol == NFC_PROTO_NFC_DEP) {
2251                 rc = pn533_activate_target_nfcdep(dev);
2252                 if (rc) {
2253                         nfc_err(&dev->interface->dev,
2254                                 "Activating target with DEP failed %d\n", rc);
2255                         return rc;
2256                 }
2257         }
2258 
2259         dev->tgt_active_prot = protocol;
2260         dev->tgt_available_prots = 0;
2261 
2262         return 0;
2263 }
2264 
2265 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
2266                                     struct nfc_target *target)
2267 {
2268         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2269         struct sk_buff *skb;
2270         struct sk_buff *resp;
2271         int rc;
2272 
2273         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2274 
2275         if (!dev->tgt_active_prot) {
2276                 nfc_err(&dev->interface->dev, "There is no active target\n");
2277                 return;
2278         }
2279 
2280         dev->tgt_active_prot = 0;
2281         skb_queue_purge(&dev->resp_q);
2282 
2283         skb = pn533_alloc_skb(dev, sizeof(u8));
2284         if (!skb)
2285                 return;
2286 
2287         *skb_put(skb, 1) = 1; /* TG*/
2288 
2289         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_RELEASE, skb);
2290         if (IS_ERR(resp))
2291                 return;
2292 
2293         rc = resp->data[0] & PN533_CMD_RET_MASK;
2294         if (rc != PN533_CMD_RET_SUCCESS)
2295                 nfc_err(&dev->interface->dev,
2296                         "Error 0x%x when releasing the target\n", rc);
2297 
2298         dev_kfree_skb(resp);
2299         return;
2300 }
2301 
2302 
2303 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
2304                                          struct sk_buff *resp)
2305 {
2306         struct pn533_cmd_jump_dep_response *rsp;
2307         u8 target_gt_len;
2308         int rc;
2309         u8 active = *(u8 *)arg;
2310 
2311         kfree(arg);
2312 
2313         if (IS_ERR(resp))
2314                 return PTR_ERR(resp);
2315 
2316         if (dev->tgt_available_prots &&
2317             !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
2318                 nfc_err(&dev->interface->dev,
2319                         "The target does not support DEP\n");
2320                 rc =  -EINVAL;
2321                 goto error;
2322         }
2323 
2324         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
2325 
2326         rc = rsp->status & PN533_CMD_RET_MASK;
2327         if (rc != PN533_CMD_RET_SUCCESS) {
2328                 nfc_err(&dev->interface->dev,
2329                         "Bringing DEP link up failed (error 0x%x)\n", rc);
2330                 goto error;
2331         }
2332 
2333         if (!dev->tgt_available_prots) {
2334                 struct nfc_target nfc_target;
2335 
2336                 dev_dbg(&dev->interface->dev, "Creating new target\n");
2337 
2338                 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
2339                 nfc_target.nfcid1_len = 10;
2340                 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
2341                 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
2342                 if (rc)
2343                         goto error;
2344 
2345                 dev->tgt_available_prots = 0;
2346         }
2347 
2348         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
2349 
2350         /* ATR_RES general bytes are located at offset 17 */
2351         target_gt_len = resp->len - 17;
2352         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
2353                                           rsp->gt, target_gt_len);
2354         if (rc == 0)
2355                 rc = nfc_dep_link_is_up(dev->nfc_dev,
2356                                         dev->nfc_dev->targets[0].idx,
2357                                         !active, NFC_RF_INITIATOR);
2358 
2359 error:
2360         dev_kfree_skb(resp);
2361         return rc;
2362 }
2363 
2364 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
2365 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
2366                              u8 comm_mode, u8 *gb, size_t gb_len)
2367 {
2368         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2369         struct sk_buff *skb;
2370         int rc, skb_len;
2371         u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
2372         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
2373 
2374         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2375 
2376         if (dev->poll_mod_count) {
2377                 nfc_err(&dev->interface->dev,
2378                         "Cannot bring the DEP link up while polling\n");
2379                 return -EBUSY;
2380         }
2381 
2382         if (dev->tgt_active_prot) {
2383                 nfc_err(&dev->interface->dev,
2384                         "There is already an active target\n");
2385                 return -EBUSY;
2386         }
2387 
2388         skb_len = 3 + gb_len; /* ActPass + BR + Next */
2389         skb_len += PASSIVE_DATA_LEN;
2390 
2391         /* NFCID3 */
2392         skb_len += NFC_NFCID3_MAXSIZE;
2393         if (target && !target->nfcid2_len) {
2394                 nfcid3[0] = 0x1;
2395                 nfcid3[1] = 0xfe;
2396                 get_random_bytes(nfcid3 + 2, 6);
2397         }
2398 
2399         skb = pn533_alloc_skb(dev, skb_len);
2400         if (!skb)
2401                 return -ENOMEM;
2402 
2403         *skb_put(skb, 1) = !comm_mode;  /* ActPass */
2404         *skb_put(skb, 1) = 0x02;  /* 424 kbps */
2405 
2406         next = skb_put(skb, 1);  /* Next */
2407         *next = 0;
2408 
2409         /* Copy passive data */
2410         memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
2411         *next |= 1;
2412 
2413         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
2414         if (target && target->nfcid2_len)
2415                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
2416                        target->nfcid2_len);
2417         else
2418                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
2419                        NFC_NFCID3_MAXSIZE);
2420         *next |= 2;
2421 
2422         if (gb != NULL && gb_len > 0) {
2423                 memcpy(skb_put(skb, gb_len), gb, gb_len);
2424                 *next |= 4; /* We have some Gi */
2425         } else {
2426                 *next = 0;
2427         }
2428 
2429         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2430         if (!arg) {
2431                 dev_kfree_skb(skb);
2432                 return -ENOMEM;
2433         }
2434 
2435         *arg = !comm_mode;
2436 
2437         pn533_rf_field(dev->nfc_dev, 0);
2438 
2439         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
2440                                   pn533_in_dep_link_up_complete, arg);
2441 
2442         if (rc < 0) {
2443                 dev_kfree_skb(skb);
2444                 kfree(arg);
2445         }
2446 
2447         return rc;
2448 }
2449 
2450 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
2451 {
2452         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2453 
2454         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2455 
2456         pn533_poll_reset_mod_list(dev);
2457 
2458         if (dev->tgt_mode || dev->tgt_active_prot)
2459                 pn533_abort_cmd(dev, GFP_KERNEL);
2460 
2461         dev->tgt_active_prot = 0;
2462         dev->tgt_mode = 0;
2463 
2464         skb_queue_purge(&dev->resp_q);
2465 
2466         return 0;
2467 }
2468 
2469 struct pn533_data_exchange_arg {
2470         data_exchange_cb_t cb;
2471         void *cb_context;
2472 };
2473 
2474 static struct sk_buff *pn533_build_response(struct pn533 *dev)
2475 {
2476         struct sk_buff *skb, *tmp, *t;
2477         unsigned int skb_len = 0, tmp_len = 0;
2478 
2479         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2480 
2481         if (skb_queue_empty(&dev->resp_q))
2482                 return NULL;
2483 
2484         if (skb_queue_len(&dev->resp_q) == 1) {
2485                 skb = skb_dequeue(&dev->resp_q);
2486                 goto out;
2487         }
2488 
2489         skb_queue_walk_safe(&dev->resp_q, tmp, t)
2490                 skb_len += tmp->len;
2491 
2492         dev_dbg(&dev->interface->dev, "%s total length %d\n",
2493                 __func__, skb_len);
2494 
2495         skb = alloc_skb(skb_len, GFP_KERNEL);
2496         if (skb == NULL)
2497                 goto out;
2498 
2499         skb_put(skb, skb_len);
2500 
2501         skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2502                 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2503                 tmp_len += tmp->len;
2504         }
2505 
2506 out:
2507         skb_queue_purge(&dev->resp_q);
2508 
2509         return skb;
2510 }
2511 
2512 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2513                                         struct sk_buff *resp)
2514 {
2515         struct pn533_data_exchange_arg *arg = _arg;
2516         struct sk_buff *skb;
2517         int rc = 0;
2518         u8 status, ret, mi;
2519 
2520         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2521 
2522         if (IS_ERR(resp)) {
2523                 rc = PTR_ERR(resp);
2524                 goto _error;
2525         }
2526 
2527         status = resp->data[0];
2528         ret = status & PN533_CMD_RET_MASK;
2529         mi = status & PN533_CMD_MI_MASK;
2530 
2531         skb_pull(resp, sizeof(status));
2532 
2533         if (ret != PN533_CMD_RET_SUCCESS) {
2534                 nfc_err(&dev->interface->dev,
2535                         "Exchanging data failed (error 0x%x)\n", ret);
2536                 rc = -EIO;
2537                 goto error;
2538         }
2539 
2540         skb_queue_tail(&dev->resp_q, resp);
2541 
2542         if (mi) {
2543                 dev->cmd_complete_mi_arg = arg;
2544                 queue_work(dev->wq, &dev->mi_rx_work);
2545                 return -EINPROGRESS;
2546         }
2547 
2548         /* Prepare for the next round */
2549         if (skb_queue_len(&dev->fragment_skb) > 0) {
2550                 dev->cmd_complete_dep_arg = arg;
2551                 queue_work(dev->wq, &dev->mi_tx_work);
2552 
2553                 return -EINPROGRESS;
2554         }
2555 
2556         skb = pn533_build_response(dev);
2557         if (!skb)
2558                 goto error;
2559 
2560         arg->cb(arg->cb_context, skb, 0);
2561         kfree(arg);
2562         return 0;
2563 
2564 error:
2565         dev_kfree_skb(resp);
2566 _error:
2567         skb_queue_purge(&dev->resp_q);
2568         arg->cb(arg->cb_context, NULL, rc);
2569         kfree(arg);
2570         return rc;
2571 }
2572 
2573 /* Split the Tx skb into small chunks */
2574 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2575 {
2576         struct sk_buff *frag;
2577         int  frag_size;
2578 
2579         do {
2580                 /* Remaining size */
2581                 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2582                         frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2583                 else
2584                         frag_size = skb->len;
2585 
2586                 /* Allocate and reserve */
2587                 frag = pn533_alloc_skb(dev, frag_size);
2588                 if (!frag) {
2589                         skb_queue_purge(&dev->fragment_skb);
2590                         break;
2591                 }
2592 
2593                 if (!dev->tgt_mode) {
2594                         /* Reserve the TG/MI byte */
2595                         skb_reserve(frag, 1);
2596 
2597                         /* MI + TG */
2598                         if (frag_size  == PN533_CMD_DATAFRAME_MAXLEN)
2599                                 *skb_push(frag, sizeof(u8)) =
2600                                                         (PN533_CMD_MI_MASK | 1);
2601                         else
2602                                 *skb_push(frag, sizeof(u8)) =  1; /* TG */
2603                 }
2604 
2605                 memcpy(skb_put(frag, frag_size), skb->data, frag_size);
2606 
2607                 /* Reduce the size of incoming buffer */
2608                 skb_pull(skb, frag_size);
2609 
2610                 /* Add this to skb_queue */
2611                 skb_queue_tail(&dev->fragment_skb, frag);
2612 
2613         } while (skb->len > 0);
2614 
2615         dev_kfree_skb(skb);
2616 
2617         return skb_queue_len(&dev->fragment_skb);
2618 }
2619 
2620 static int pn533_transceive(struct nfc_dev *nfc_dev,
2621                             struct nfc_target *target, struct sk_buff *skb,
2622                             data_exchange_cb_t cb, void *cb_context)
2623 {
2624         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2625         struct pn533_data_exchange_arg *arg = NULL;
2626         int rc;
2627 
2628         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2629 
2630         if (!dev->tgt_active_prot) {
2631                 nfc_err(&dev->interface->dev,
2632                         "Can't exchange data if there is no active target\n");
2633                 rc = -EINVAL;
2634                 goto error;
2635         }
2636 
2637         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2638         if (!arg) {
2639                 rc = -ENOMEM;
2640                 goto error;
2641         }
2642 
2643         arg->cb = cb;
2644         arg->cb_context = cb_context;
2645 
2646         switch (dev->device_type) {
2647         case PN533_DEVICE_PASORI:
2648                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2649                         rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2650                                                    skb,
2651                                                    pn533_data_exchange_complete,
2652                                                    arg);
2653 
2654                         break;
2655                 }
2656         default:
2657                 /* jumbo frame ? */
2658                 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2659                         rc = pn533_fill_fragment_skbs(dev, skb);
2660                         if (rc <= 0)
2661                                 goto error;
2662 
2663                         skb = skb_dequeue(&dev->fragment_skb);
2664                         if (!skb) {
2665                                 rc = -EIO;
2666                                 goto error;
2667                         }
2668                 } else {
2669                         *skb_push(skb, sizeof(u8)) =  1; /* TG */
2670                 }
2671 
2672                 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2673                                            skb, pn533_data_exchange_complete,
2674                                            arg);
2675 
2676                 break;
2677         }
2678 
2679         if (rc < 0) /* rc from send_async */
2680                 goto error;
2681 
2682         return 0;
2683 
2684 error:
2685         kfree(arg);
2686         dev_kfree_skb(skb);
2687         return rc;
2688 }
2689 
2690 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2691                                   struct sk_buff *resp)
2692 {
2693         u8 status;
2694 
2695         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2696 
2697         if (IS_ERR(resp))
2698                 return PTR_ERR(resp);
2699 
2700         status = resp->data[0];
2701 
2702         /* Prepare for the next round */
2703         if (skb_queue_len(&dev->fragment_skb) > 0) {
2704                 queue_work(dev->wq, &dev->mi_tm_tx_work);
2705                 return -EINPROGRESS;
2706         }
2707         dev_kfree_skb(resp);
2708 
2709         if (status != 0) {
2710                 nfc_tm_deactivated(dev->nfc_dev);
2711 
2712                 dev->tgt_mode = 0;
2713 
2714                 return 0;
2715         }
2716 
2717         queue_work(dev->wq, &dev->tg_work);
2718 
2719         return 0;
2720 }
2721 
2722 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2723 {
2724         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2725         int rc;
2726 
2727         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2728 
2729         /* let's split in multiple chunks if size's too big */
2730         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2731                 rc = pn533_fill_fragment_skbs(dev, skb);
2732                 if (rc <= 0)
2733                         goto error;
2734 
2735                 /* get the first skb */
2736                 skb = skb_dequeue(&dev->fragment_skb);
2737                 if (!skb) {
2738                         rc = -EIO;
2739                         goto error;
2740                 }
2741 
2742                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2743                                                 pn533_tm_send_complete, NULL);
2744         } else {
2745                 /* Send th skb */
2746                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2747                                                 pn533_tm_send_complete, NULL);
2748         }
2749 
2750 error:
2751         if (rc < 0) {
2752                 dev_kfree_skb(skb);
2753                 skb_queue_purge(&dev->fragment_skb);
2754         }
2755 
2756         return rc;
2757 }
2758 
2759 static void pn533_wq_mi_recv(struct work_struct *work)
2760 {
2761         struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2762         struct sk_buff *skb;
2763         int rc;
2764 
2765         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2766 
2767         skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2768         if (!skb)
2769                 goto error;
2770 
2771         switch (dev->device_type) {
2772         case PN533_DEVICE_PASORI:
2773                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2774                         rc = pn533_send_cmd_direct_async(dev,
2775                                                 PN533_CMD_IN_COMM_THRU,
2776                                                 skb,
2777                                                 pn533_data_exchange_complete,
2778                                                  dev->cmd_complete_mi_arg);
2779 
2780                         break;
2781                 }
2782         default:
2783                 *skb_put(skb, sizeof(u8)) =  1; /*TG*/
2784 
2785                 rc = pn533_send_cmd_direct_async(dev,
2786                                                  PN533_CMD_IN_DATA_EXCHANGE,
2787                                                  skb,
2788                                                  pn533_data_exchange_complete,
2789                                                  dev->cmd_complete_mi_arg);
2790 
2791                 break;
2792         }
2793 
2794         if (rc == 0) /* success */
2795                 return;
2796 
2797         nfc_err(&dev->interface->dev,
2798                 "Error %d when trying to perform data_exchange\n", rc);
2799 
2800         dev_kfree_skb(skb);
2801         kfree(dev->cmd_complete_mi_arg);
2802 
2803 error:
2804         pn533_send_ack(dev, GFP_KERNEL);
2805         queue_work(dev->wq, &dev->cmd_work);
2806 }
2807 
2808 static void pn533_wq_mi_send(struct work_struct *work)
2809 {
2810         struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2811         struct sk_buff *skb;
2812         int rc;
2813 
2814         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2815 
2816         /* Grab the first skb in the queue */
2817         skb = skb_dequeue(&dev->fragment_skb);
2818 
2819         if (skb == NULL) {      /* No more data */
2820                 /* Reset the queue for future use */
2821                 skb_queue_head_init(&dev->fragment_skb);
2822                 goto error;
2823         }
2824 
2825         switch (dev->device_type) {
2826         case PN533_DEVICE_PASORI:
2827                 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2828                         rc = -EIO;
2829                         break;
2830                 }
2831 
2832                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2833                                                  skb,
2834                                                  pn533_data_exchange_complete,
2835                                                  dev->cmd_complete_dep_arg);
2836 
2837                 break;
2838 
2839         default:
2840                 /* Still some fragments? */
2841                 rc = pn533_send_cmd_direct_async(dev,PN533_CMD_IN_DATA_EXCHANGE,
2842                                                  skb,
2843                                                  pn533_data_exchange_complete,
2844                                                  dev->cmd_complete_dep_arg);
2845 
2846                 break;
2847         }
2848 
2849         if (rc == 0) /* success */
2850                 return;
2851 
2852         nfc_err(&dev->interface->dev,
2853                 "Error %d when trying to perform data_exchange\n", rc);
2854 
2855         dev_kfree_skb(skb);
2856         kfree(dev->cmd_complete_dep_arg);
2857 
2858 error:
2859         pn533_send_ack(dev, GFP_KERNEL);
2860         queue_work(dev->wq, &dev->cmd_work);
2861 }
2862 
2863 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2864                                                                 u8 cfgdata_len)
2865 {
2866         struct sk_buff *skb;
2867         struct sk_buff *resp;
2868         int skb_len;
2869 
2870         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2871 
2872         skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2873 
2874         skb = pn533_alloc_skb(dev, skb_len);
2875         if (!skb)
2876                 return -ENOMEM;
2877 
2878         *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2879         memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2880 
2881         resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2882         if (IS_ERR(resp))
2883                 return PTR_ERR(resp);
2884 
2885         dev_kfree_skb(resp);
2886         return 0;
2887 }
2888 
2889 static int pn533_get_firmware_version(struct pn533 *dev,
2890                                       struct pn533_fw_version *fv)
2891 {
2892         struct sk_buff *skb;
2893         struct sk_buff *resp;
2894 
2895         skb = pn533_alloc_skb(dev, 0);
2896         if (!skb)
2897                 return -ENOMEM;
2898 
2899         resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2900         if (IS_ERR(resp))
2901                 return PTR_ERR(resp);
2902 
2903         fv->ic = resp->data[0];
2904         fv->ver = resp->data[1];
2905         fv->rev = resp->data[2];
2906         fv->support = resp->data[3];
2907 
2908         dev_kfree_skb(resp);
2909         return 0;
2910 }
2911 
2912 static int pn533_pasori_fw_reset(struct pn533 *dev)
2913 {
2914         struct sk_buff *skb;
2915         struct sk_buff *resp;
2916 
2917         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2918 
2919         skb = pn533_alloc_skb(dev, sizeof(u8));
2920         if (!skb)
2921                 return -ENOMEM;
2922 
2923         *skb_put(skb, sizeof(u8)) = 0x1;
2924 
2925         resp = pn533_send_cmd_sync(dev, 0x18, skb);
2926         if (IS_ERR(resp))
2927                 return PTR_ERR(resp);
2928 
2929         dev_kfree_skb(resp);
2930 
2931         return 0;
2932 }
2933 
2934 struct pn533_acr122_poweron_rdr_arg {
2935         int rc;
2936         struct completion done;
2937 };
2938 
2939 static void pn533_acr122_poweron_rdr_resp(struct urb *urb)
2940 {
2941         struct pn533_acr122_poweron_rdr_arg *arg = urb->context;
2942 
2943         dev_dbg(&urb->dev->dev, "%s\n", __func__);
2944 
2945         print_hex_dump_debug("ACR122 RX: ", DUMP_PREFIX_NONE, 16, 1,
2946                        urb->transfer_buffer, urb->transfer_buffer_length,
2947                        false);
2948 
2949         arg->rc = urb->status;
2950         complete(&arg->done);
2951 }
2952 
2953 static int pn533_acr122_poweron_rdr(struct pn533 *dev)
2954 {
2955         /* Power on th reader (CCID cmd) */
2956         u8 cmd[10] = {PN533_ACR122_PC_TO_RDR_ICCPOWERON,
2957                       0, 0, 0, 0, 0, 0, 3, 0, 0};
2958         u8 buf[255];
2959         int rc;
2960         void *cntx;
2961         struct pn533_acr122_poweron_rdr_arg arg;
2962 
2963         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2964 
2965         init_completion(&arg.done);
2966         cntx = dev->in_urb->context;  /* backup context */
2967 
2968         dev->in_urb->transfer_buffer = buf;
2969         dev->in_urb->transfer_buffer_length = 255;
2970         dev->in_urb->complete = pn533_acr122_poweron_rdr_resp;
2971         dev->in_urb->context = &arg;
2972 
2973         dev->out_urb->transfer_buffer = cmd;
2974         dev->out_urb->transfer_buffer_length = sizeof(cmd);
2975 
2976         print_hex_dump_debug("ACR122 TX: ", DUMP_PREFIX_NONE, 16, 1,
2977                        cmd, sizeof(cmd), false);
2978 
2979         rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
2980         if (rc) {
2981                 nfc_err(&dev->interface->dev,
2982                         "Reader power on cmd error %d\n", rc);
2983                 return rc;
2984         }
2985 
2986         rc =  usb_submit_urb(dev->in_urb, GFP_KERNEL);
2987         if (rc) {
2988                 nfc_err(&dev->interface->dev,
2989                         "Can't submit reader poweron cmd response %d\n", rc);
2990                 return rc;
2991         }
2992 
2993         wait_for_completion(&arg.done);
2994         dev->in_urb->context = cntx; /* restore context */
2995 
2996         return arg.rc;
2997 }
2998 
2999 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
3000 {
3001         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
3002         u8 rf_field = !!rf;
3003         int rc;
3004 
3005         rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
3006 
3007         rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
3008                                      (u8 *)&rf_field, 1);
3009         if (rc) {
3010                 nfc_err(&dev->interface->dev, "Error on setting RF field\n");
3011                 return rc;
3012         }
3013 
3014         return rc;
3015 }
3016 
3017 static int pn533_dev_up(struct nfc_dev *nfc_dev)
3018 {
3019         return pn533_rf_field(nfc_dev, 1);
3020 }
3021 
3022 static int pn533_dev_down(struct nfc_dev *nfc_dev)
3023 {
3024         return pn533_rf_field(nfc_dev, 0);
3025 }
3026 
3027 static struct nfc_ops pn533_nfc_ops = {
3028         .dev_up = pn533_dev_up,
3029         .dev_down = pn533_dev_down,
3030         .dep_link_up = pn533_dep_link_up,
3031         .dep_link_down = pn533_dep_link_down,
3032         .start_poll = pn533_start_poll,
3033         .stop_poll = pn533_stop_poll,
3034         .activate_target = pn533_activate_target,
3035         .deactivate_target = pn533_deactivate_target,
3036         .im_transceive = pn533_transceive,
3037         .tm_send = pn533_tm_send,
3038 };
3039 
3040 static int pn533_setup(struct pn533 *dev)
3041 {
3042         struct pn533_config_max_retries max_retries;
3043         struct pn533_config_timing timing;
3044         u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
3045         int rc;
3046 
3047         switch (dev->device_type) {
3048         case PN533_DEVICE_STD:
3049         case PN533_DEVICE_PASORI:
3050         case PN533_DEVICE_ACR122U:
3051                 max_retries.mx_rty_atr = 0x2;
3052                 max_retries.mx_rty_psl = 0x1;
3053                 max_retries.mx_rty_passive_act =
3054                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
3055 
3056                 timing.rfu = PN533_CONFIG_TIMING_102;
3057                 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
3058                 timing.dep_timeout = PN533_CONFIG_TIMING_204;
3059 
3060                 break;
3061 
3062         default:
3063                 nfc_err(&dev->interface->dev, "Unknown device type %d\n",
3064                         dev->device_type);
3065                 return -EINVAL;
3066         }
3067 
3068         rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
3069                                      (u8 *)&max_retries, sizeof(max_retries));
3070         if (rc) {
3071                 nfc_err(&dev->interface->dev,
3072                         "Error on setting MAX_RETRIES config\n");
3073                 return rc;
3074         }
3075 
3076 
3077         rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
3078                                      (u8 *)&timing, sizeof(timing));
3079         if (rc) {
3080                 nfc_err(&dev->interface->dev, "Error on setting RF timings\n");
3081                 return rc;
3082         }
3083 
3084         switch (dev->device_type) {
3085         case PN533_DEVICE_STD:
3086                 break;
3087 
3088         case PN533_DEVICE_PASORI:
3089                 pn533_pasori_fw_reset(dev);
3090 
3091                 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
3092                                              pasori_cfg, 3);
3093                 if (rc) {
3094                         nfc_err(&dev->interface->dev,
3095                                 "Error while settings PASORI config\n");
3096                         return rc;
3097                 }
3098 
3099                 pn533_pasori_fw_reset(dev);
3100 
3101                 break;
3102         }
3103 
3104         return 0;
3105 }
3106 
3107 static int pn533_probe(struct usb_interface *interface,
3108                         const struct usb_device_id *id)
3109 {
3110         struct pn533_fw_version fw_ver;
3111         struct pn533 *dev;
3112         struct usb_host_interface *iface_desc;
3113         struct usb_endpoint_descriptor *endpoint;
3114         int in_endpoint = 0;
3115         int out_endpoint = 0;
3116         int rc = -ENOMEM;
3117         int i;
3118         u32 protocols;
3119 
3120         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3121         if (!dev)
3122                 return -ENOMEM;
3123 
3124         dev->udev = usb_get_dev(interface_to_usbdev(interface));
3125         dev->interface = interface;
3126         mutex_init(&dev->cmd_lock);
3127 
3128         iface_desc = interface->cur_altsetting;
3129         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
3130                 endpoint = &iface_desc->endpoint[i].desc;
3131 
3132                 if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
3133                         in_endpoint = endpoint->bEndpointAddress;
3134 
3135                 if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
3136                         out_endpoint = endpoint->bEndpointAddress;
3137         }
3138 
3139         if (!in_endpoint || !out_endpoint) {
3140                 nfc_err(&interface->dev,
3141                         "Could not find bulk-in or bulk-out endpoint\n");
3142                 rc = -ENODEV;
3143                 goto error;
3144         }
3145 
3146         dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
3147         dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
3148 
3149         if (!dev->in_urb || !dev->out_urb)
3150                 goto error;
3151 
3152         usb_fill_bulk_urb(dev->in_urb, dev->udev,
3153                           usb_rcvbulkpipe(dev->udev, in_endpoint),
3154                           NULL, 0, NULL, dev);
3155         usb_fill_bulk_urb(dev->out_urb, dev->udev,
3156                           usb_sndbulkpipe(dev->udev, out_endpoint),
3157                           NULL, 0, pn533_send_complete, dev);
3158 
3159         INIT_WORK(&dev->cmd_work, pn533_wq_cmd);
3160         INIT_WORK(&dev->cmd_complete_work, pn533_wq_cmd_complete);
3161         INIT_WORK(&dev->mi_rx_work, pn533_wq_mi_recv);
3162         INIT_WORK(&dev->mi_tx_work, pn533_wq_mi_send);
3163         INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
3164         INIT_WORK(&dev->mi_tm_rx_work, pn533_wq_tm_mi_recv);
3165         INIT_WORK(&dev->mi_tm_tx_work, pn533_wq_tm_mi_send);
3166         INIT_DELAYED_WORK(&dev->poll_work, pn533_wq_poll);
3167         INIT_WORK(&dev->rf_work, pn533_wq_rf);
3168         dev->wq = alloc_ordered_workqueue("pn533", 0);
3169         if (dev->wq == NULL)
3170                 goto error;
3171 
3172         init_timer(&dev->listen_timer);
3173         dev->listen_timer.data = (unsigned long) dev;
3174         dev->listen_timer.function = pn533_listen_mode_timer;
3175 
3176         skb_queue_head_init(&dev->resp_q);
3177         skb_queue_head_init(&dev->fragment_skb);
3178 
3179         INIT_LIST_HEAD(&dev->cmd_queue);
3180 
3181         usb_set_intfdata(interface, dev);
3182 
3183         dev->ops = &pn533_std_frame_ops;
3184 
3185         dev->protocol_type = PN533_PROTO_REQ_ACK_RESP;
3186         dev->device_type = id->driver_info;
3187         switch (dev->device_type) {
3188         case PN533_DEVICE_STD:
3189                 protocols = PN533_ALL_PROTOCOLS;
3190                 break;
3191 
3192         case PN533_DEVICE_PASORI:
3193                 protocols = PN533_NO_TYPE_B_PROTOCOLS;
3194                 break;
3195 
3196         case PN533_DEVICE_ACR122U:
3197                 protocols = PN533_NO_TYPE_B_PROTOCOLS;
3198                 dev->ops = &pn533_acr122_frame_ops;
3199                 dev->protocol_type = PN533_PROTO_REQ_RESP,
3200 
3201                 rc = pn533_acr122_poweron_rdr(dev);
3202                 if (rc < 0) {
3203                         nfc_err(&dev->interface->dev,
3204                                 "Couldn't poweron the reader (error %d)\n", rc);
3205                         goto destroy_wq;
3206                 }
3207                 break;
3208 
3209         default:
3210                 nfc_err(&dev->interface->dev, "Unknown device type %d\n",
3211                         dev->device_type);
3212                 rc = -EINVAL;
3213                 goto destroy_wq;
3214         }
3215 
3216         memset(&fw_ver, 0, sizeof(fw_ver));
3217         rc = pn533_get_firmware_version(dev, &fw_ver);
3218         if (rc < 0)
3219                 goto destroy_wq;
3220 
3221         nfc_info(&dev->interface->dev,
3222                  "NXP PN5%02X firmware ver %d.%d now attached\n",
3223                  fw_ver.ic, fw_ver.ver, fw_ver.rev);
3224 
3225 
3226         dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
3227                                            dev->ops->tx_header_len +
3228                                            PN533_CMD_DATAEXCH_HEAD_LEN,
3229                                            dev->ops->tx_tail_len);
3230         if (!dev->nfc_dev) {
3231                 rc = -ENOMEM;
3232                 goto destroy_wq;
3233         }
3234 
3235         nfc_set_parent_dev(dev->nfc_dev, &interface->dev);
3236         nfc_set_drvdata(dev->nfc_dev, dev);
3237 
3238         rc = nfc_register_device(dev->nfc_dev);
3239         if (rc)
3240                 goto free_nfc_dev;
3241 
3242         rc = pn533_setup(dev);
3243         if (rc)
3244                 goto unregister_nfc_dev;
3245 
3246         return 0;
3247 
3248 unregister_nfc_dev:
3249         nfc_unregister_device(dev->nfc_dev);
3250 
3251 free_nfc_dev:
3252         nfc_free_device(dev->nfc_dev);
3253 
3254 destroy_wq:
3255         destroy_workqueue(dev->wq);
3256 error:
3257         usb_free_urb(dev->in_urb);
3258         usb_free_urb(dev->out_urb);
3259         usb_put_dev(dev->udev);
3260         kfree(dev);
3261         return rc;
3262 }
3263 
3264 static void pn533_disconnect(struct usb_interface *interface)
3265 {
3266         struct pn533 *dev;
3267         struct pn533_cmd *cmd, *n;
3268 
3269         dev = usb_get_intfdata(interface);
3270         usb_set_intfdata(interface, NULL);
3271 
3272         nfc_unregister_device(dev->nfc_dev);
3273         nfc_free_device(dev->nfc_dev);
3274 
3275         usb_kill_urb(dev->in_urb);
3276         usb_kill_urb(dev->out_urb);
3277 
3278         flush_delayed_work(&dev->poll_work);
3279         destroy_workqueue(dev->wq);
3280 
3281         skb_queue_purge(&dev->resp_q);
3282 
3283         del_timer(&dev->listen_timer);
3284 
3285         list_for_each_entry_safe(cmd, n, &dev->cmd_queue, queue) {
3286                 list_del(&cmd->queue);
3287                 kfree(cmd);
3288         }
3289 
3290         usb_free_urb(dev->in_urb);
3291         usb_free_urb(dev->out_urb);
3292         kfree(dev);
3293 
3294         nfc_info(&interface->dev, "NXP PN533 NFC device disconnected\n");
3295 }
3296 
3297 static struct usb_driver pn533_driver = {
3298         .name =         "pn533",
3299         .probe =        pn533_probe,
3300         .disconnect =   pn533_disconnect,
3301         .id_table =     pn533_table,
3302 };
3303 
3304 module_usb_driver(pn533_driver);
3305 
3306 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
3307 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
3308 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
3309 MODULE_DESCRIPTION("PN533 usb driver ver " VERSION);
3310 MODULE_VERSION(VERSION);
3311 MODULE_LICENSE("GPL");
3312 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us