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, write to the
  17  * Free Software Foundation, Inc.,
  18  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <linux/device.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/usb.h>
  26 #include <linux/nfc.h>
  27 #include <linux/netdevice.h>
  28 #include <net/nfc/nfc.h>
  29
  30 #define VERSION "0.1"
  31
  32 #define PN533_VENDOR_ID 0x4CC
  33 #define PN533_PRODUCT_ID 0x2533
  34
  35 #define SCM_VENDOR_ID 0x4E6
  36 #define SCL3711_PRODUCT_ID 0x5591
  37
  38 #define SONY_VENDOR_ID         0x054c
  39 #define PASORI_PRODUCT_ID      0x02e1
  40
  41 #define PN533_DEVICE_STD    0x1
  42 #define PN533_DEVICE_PASORI 0x2
  43
  44 #define PN533_ALL_PROTOCOLS (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK |\
  45                              NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK |\
  46                              NFC_PROTO_NFC_DEP_MASK |\
  47                              NFC_PROTO_ISO14443_B_MASK)
  48
  49 #define PN533_NO_TYPE_B_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
  50                                    NFC_PROTO_MIFARE_MASK | \
  51                                    NFC_PROTO_FELICA_MASK | \
  52                                    NFC_PROTO_ISO14443_MASK | \
  53                                    NFC_PROTO_NFC_DEP_MASK)
  54
  55 static const struct usb_device_id pn533_table[] = {
  56         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE,
  57           .idVendor             = PN533_VENDOR_ID,
  58           .idProduct            = PN533_PRODUCT_ID,
  59           .driver_info          = PN533_DEVICE_STD,
  60         },
  61         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE,
  62           .idVendor             = SCM_VENDOR_ID,
  63           .idProduct            = SCL3711_PRODUCT_ID,
  64           .driver_info          = PN533_DEVICE_STD,
  65         },
  66         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE,
  67           .idVendor             = SONY_VENDOR_ID,
  68           .idProduct            = PASORI_PRODUCT_ID,
  69           .driver_info          = PN533_DEVICE_PASORI,
  70         },
  71         { }
  72 };
  73 MODULE_DEVICE_TABLE(usb, pn533_table);
  74
  75 /* How much time we spend listening for initiators */
  76 #define PN533_LISTEN_TIME 2
  77
  78 /* Standard pn533 frame definitions */
  79 #define PN533_STD_FRAME_HEADER_LEN (sizeof(struct pn533_std_frame) \
  80                                         + 2) /* data[0] TFI, data[1] CC */
  81 #define PN533_STD_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
  82
  83 /*
  84  * Max extended frame payload len, excluding TFI and CC
  85  * which are already in PN533_FRAME_HEADER_LEN.
  86  */
  87 #define PN533_STD_FRAME_MAX_PAYLOAD_LEN 263
  88
  89 #define PN533_STD_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2),
  90                                   Postamble (1) */
  91 #define PN533_STD_FRAME_CHECKSUM(f) (f->data[f->datalen])
  92 #define PN533_STD_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])
  93
  94 /* start of frame */
  95 #define PN533_STD_FRAME_SOF 0x00FF
  96
  97 /* standard frame identifier: in/out/error */
  98 #define PN533_STD_FRAME_IDENTIFIER(f) (f->data[0]) /* TFI */
  99 #define PN533_STD_FRAME_DIR_OUT 0xD4
 100 #define PN533_STD_FRAME_DIR_IN 0xD5
 101
 102 /* PN533 Commands */
 103 #define PN533_STD_FRAME_CMD(f) (f->data[1])
 104
 105 #define PN533_CMD_GET_FIRMWARE_VERSION 0x02
 106 #define PN533_CMD_RF_CONFIGURATION 0x32
 107 #define PN533_CMD_IN_DATA_EXCHANGE 0x40
 108 #define PN533_CMD_IN_COMM_THRU     0x42
 109 #define PN533_CMD_IN_LIST_PASSIVE_TARGET 0x4A
 110 #define PN533_CMD_IN_ATR 0x50
 111 #define PN533_CMD_IN_RELEASE 0x52
 112 #define PN533_CMD_IN_JUMP_FOR_DEP 0x56
 113
 114 #define PN533_CMD_TG_INIT_AS_TARGET 0x8c
 115 #define PN533_CMD_TG_GET_DATA 0x86
 116 #define PN533_CMD_TG_SET_DATA 0x8e
 117 #define PN533_CMD_UNDEF 0xff
 118
 119 #define PN533_CMD_RESPONSE(cmd) (cmd + 1)
 120
 121 /* PN533 Return codes */
 122 #define PN533_CMD_RET_MASK 0x3F
 123 #define PN533_CMD_MI_MASK 0x40
 124 #define PN533_CMD_RET_SUCCESS 0x00
 125
 126 struct pn533;
 127
 128 typedef int (*pn533_cmd_complete_t) (struct pn533 *dev, void *arg, int status);
 129
 130 typedef int (*pn533_send_async_complete_t) (struct pn533 *dev, void *arg,
 131                                         struct sk_buff *resp);
 132
 133 /* structs for pn533 commands */
 134
 135 /* PN533_CMD_GET_FIRMWARE_VERSION */
 136 struct pn533_fw_version {
 137         u8 ic;
 138         u8 ver;
 139         u8 rev;
 140         u8 support;
 141 };
 142
 143 /* PN533_CMD_RF_CONFIGURATION */
 144 #define PN533_CFGITEM_TIMING 0x02
 145 #define PN533_CFGITEM_MAX_RETRIES 0x05
 146 #define PN533_CFGITEM_PASORI 0x82
 147
 148 #define PN533_CONFIG_TIMING_102 0xb
 149 #define PN533_CONFIG_TIMING_204 0xc
 150 #define PN533_CONFIG_TIMING_409 0xd
 151 #define PN533_CONFIG_TIMING_819 0xe
 152
 153 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
 154 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
 155
 156 struct pn533_config_max_retries {
 157         u8 mx_rty_atr;
 158         u8 mx_rty_psl;
 159         u8 mx_rty_passive_act;
 160 } __packed;
 161
 162 struct pn533_config_timing {
 163         u8 rfu;
 164         u8 atr_res_timeout;
 165         u8 dep_timeout;
 166 } __packed;
 167
 168 /* PN533_CMD_IN_LIST_PASSIVE_TARGET */
 169
 170 /* felica commands opcode */
 171 #define PN533_FELICA_OPC_SENSF_REQ 0
 172 #define PN533_FELICA_OPC_SENSF_RES 1
 173 /* felica SENSF_REQ parameters */
 174 #define PN533_FELICA_SENSF_SC_ALL 0xFFFF
 175 #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
 176 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
 177 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
 178
 179 /* type B initiator_data values */
 180 #define PN533_TYPE_B_AFI_ALL_FAMILIES 0
 181 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
 182 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
 183
 184 union pn533_cmd_poll_initdata {
 185         struct {
 186                 u8 afi;
 187                 u8 polling_method;
 188         } __packed type_b;
 189         struct {
 190                 u8 opcode;
 191                 __be16 sc;
 192                 u8 rc;
 193                 u8 tsn;
 194         } __packed felica;
 195 };
 196
 197 /* Poll modulations */
 198 enum {
 199         PN533_POLL_MOD_106KBPS_A,
 200         PN533_POLL_MOD_212KBPS_FELICA,
 201         PN533_POLL_MOD_424KBPS_FELICA,
 202         PN533_POLL_MOD_106KBPS_JEWEL,
 203         PN533_POLL_MOD_847KBPS_B,
 204         PN533_LISTEN_MOD,
 205
 206         __PN533_POLL_MOD_AFTER_LAST,
 207 };
 208 #define PN533_POLL_MOD_MAX (__PN533_POLL_MOD_AFTER_LAST - 1)
 209
 210 struct pn533_poll_modulations {
 211         struct {
 212                 u8 maxtg;
 213                 u8 brty;
 214                 union pn533_cmd_poll_initdata initiator_data;
 215         } __packed data;
 216         u8 len;
 217 };
 218
 219 static const struct pn533_poll_modulations poll_mod[] = {
 220         [PN533_POLL_MOD_106KBPS_A] = {
 221                 .data = {
 222                         .maxtg = 1,
 223                         .brty = 0,
 224                 },
 225                 .len = 2,
 226         },
 227         [PN533_POLL_MOD_212KBPS_FELICA] = {
 228                 .data = {
 229                         .maxtg = 1,
 230                         .brty = 1,
 231                         .initiator_data.felica = {
 232                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
 233                                 .sc = PN533_FELICA_SENSF_SC_ALL,
 234                                 .rc = PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE,
 235                                 .tsn = 0,
 236                         },
 237                 },
 238                 .len = 7,
 239         },
 240         [PN533_POLL_MOD_424KBPS_FELICA] = {
 241                 .data = {
 242                         .maxtg = 1,
 243                         .brty = 2,
 244                         .initiator_data.felica = {
 245                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
 246                                 .sc = PN533_FELICA_SENSF_SC_ALL,
 247                                 .rc = PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE,
 248                                 .tsn = 0,
 249                         },
 250                  },
 251                 .len = 7,
 252         },
 253         [PN533_POLL_MOD_106KBPS_JEWEL] = {
 254                 .data = {
 255                         .maxtg = 1,
 256                         .brty = 4,
 257                 },
 258                 .len = 2,
 259         },
 260         [PN533_POLL_MOD_847KBPS_B] = {
 261                 .data = {
 262                         .maxtg = 1,
 263                         .brty = 8,
 264                         .initiator_data.type_b = {
 265                                 .afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
 266                                 .polling_method =
 267                                         PN533_TYPE_B_POLL_METHOD_TIMESLOT,
 268                         },
 269                 },
 270                 .len = 3,
 271         },
 272         [PN533_LISTEN_MOD] = {
 273                 .len = 0,
 274         },
 275 };
 276
 277 /* PN533_CMD_IN_ATR */
 278
 279 struct pn533_cmd_activate_response {
 280         u8 status;
 281         u8 nfcid3t[10];
 282         u8 didt;
 283         u8 bst;
 284         u8 brt;
 285         u8 to;
 286         u8 ppt;
 287         /* optional */
 288         u8 gt[];
 289 } __packed;
 290
 291 struct pn533_cmd_jump_dep_response {
 292         u8 status;
 293         u8 tg;
 294         u8 nfcid3t[10];
 295         u8 didt;
 296         u8 bst;
 297         u8 brt;
 298         u8 to;
 299         u8 ppt;
 300         /* optional */
 301         u8 gt[];
 302 } __packed;
 303
 304
 305 /* PN533_TG_INIT_AS_TARGET */
 306 #define PN533_INIT_TARGET_PASSIVE 0x1
 307 #define PN533_INIT_TARGET_DEP 0x2
 308
 309 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
 310 #define PN533_INIT_TARGET_RESP_ACTIVE     0x1
 311 #define PN533_INIT_TARGET_RESP_DEP        0x4
 312
 313 struct pn533 {
 314         struct usb_device *udev;
 315         struct usb_interface *interface;
 316         struct nfc_dev *nfc_dev;
 317
 318         struct urb *out_urb;
 319         struct urb *in_urb;
 320
 321         struct sk_buff_head resp_q;
 322
 323         struct workqueue_struct *wq;
 324         struct work_struct cmd_work;
 325         struct work_struct cmd_complete_work;
 326         struct work_struct poll_work;
 327         struct work_struct mi_work;
 328         struct work_struct tg_work;
 329         struct timer_list listen_timer;
 330         int wq_in_error;
 331         int cancel_listen;
 332
 333         pn533_cmd_complete_t cmd_complete;
 334         void *cmd_complete_arg;
 335         void *cmd_complete_mi_arg;
 336         struct mutex cmd_lock;
 337         u8 cmd;
 338
 339         struct pn533_poll_modulations *poll_mod_active[PN533_POLL_MOD_MAX + 1];
 340         u8 poll_mod_count;
 341         u8 poll_mod_curr;
 342         u32 poll_protocols;
 343         u32 listen_protocols;
 344
 345         u8 *gb;
 346         size_t gb_len;
 347
 348         u8 tgt_available_prots;
 349         u8 tgt_active_prot;
 350         u8 tgt_mode;
 351
 352         u32 device_type;
 353
 354         struct list_head cmd_queue;
 355         u8 cmd_pending;
 356
 357         struct pn533_frame_ops *ops;
 358 };
 359
 360 struct pn533_cmd {
 361         struct list_head queue;
 362         u8 cmd_code;
 363         struct sk_buff *req;
 364         struct sk_buff *resp;
 365         int resp_len;
 366         void *arg;
 367 };
 368
 369 struct pn533_std_frame {
 370         u8 preamble;
 371         __be16 start_frame;
 372         u8 datalen;
 373         u8 datalen_checksum;
 374         u8 data[];
 375 } __packed;
 376
 377 struct pn533_frame_ops {
 378         void (*tx_frame_init)(void *frame, u8 cmd_code);
 379         void (*tx_frame_finish)(void *frame);
 380         void (*tx_update_payload_len)(void *frame, int len);
 381         int tx_header_len;
 382         int tx_tail_len;
 383
 384         bool (*rx_is_frame_valid)(void *frame);
 385         int (*rx_frame_size)(void *frame);
 386         int rx_header_len;
 387         int rx_tail_len;
 388
 389         int max_payload_len;
 390         u8 (*get_cmd_code)(void *frame);
 391 };
 392
 393 /* The rule: value + checksum = 0 */
 394 static inline u8 pn533_std_checksum(u8 value)
 395 {
 396         return ~value + 1;
 397 }
 398
 399 /* The rule: sum(data elements) + checksum = 0 */
 400 static u8 pn533_std_data_checksum(u8 *data, int datalen)
 401 {
 402         u8 sum = 0;
 403         int i;
 404
 405         for (i = 0; i < datalen; i++)
 406                 sum += data[i];
 407
 408         return pn533_std_checksum(sum);
 409 }
 410
 411 static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code)
 412 {
 413         struct pn533_std_frame *frame = _frame;
 414
 415         frame->preamble = 0;
 416         frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF);
 417         PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT;
 418         PN533_STD_FRAME_CMD(frame) = cmd_code;
 419         frame->datalen = 2;
 420 }
 421
 422 static void pn533_std_tx_frame_finish(void *_frame)
 423 {
 424         struct pn533_std_frame *frame = _frame;
 425
 426         frame->datalen_checksum = pn533_std_checksum(frame->datalen);
 427
 428         PN533_STD_FRAME_CHECKSUM(frame) =
 429                 pn533_std_data_checksum(frame->data, frame->datalen);
 430
 431         PN533_STD_FRAME_POSTAMBLE(frame) = 0;
 432 }
 433
 434 static void pn533_std_tx_update_payload_len(void *_frame, int len)
 435 {
 436         struct pn533_std_frame *frame = _frame;
 437
 438         frame->datalen += len;
 439 }
 440
 441 static bool pn533_std_rx_frame_is_valid(void *_frame)
 442 {
 443         u8 checksum;
 444         struct pn533_std_frame *frame = _frame;
 445
 446         if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
 447                 return false;
 448
 449         checksum = pn533_std_checksum(frame->datalen);
 450         if (checksum != frame->datalen_checksum)
 451                 return false;
 452
 453         checksum = pn533_std_data_checksum(frame->data, frame->datalen);
 454         if (checksum != PN533_STD_FRAME_CHECKSUM(frame))
 455                 return false;
 456
 457         return true;
 458 }
 459
 460 static bool pn533_std_rx_frame_is_ack(struct pn533_std_frame *frame)
 461 {
 462         if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
 463                 return false;
 464
 465         if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
 466                 return false;
 467
 468         return true;
 469 }
 470
 471 static inline int pn533_std_rx_frame_size(void *frame)
 472 {
 473         struct pn533_std_frame *f = frame;
 474
 475         return sizeof(struct pn533_std_frame) + f->datalen +
 476                PN533_STD_FRAME_TAIL_LEN;
 477 }
 478
 479 static u8 pn533_std_get_cmd_code(void *frame)
 480 {
 481         struct pn533_std_frame *f = frame;
 482
 483         return PN533_STD_FRAME_CMD(f);
 484 }
 485
 486 static struct pn533_frame_ops pn533_std_frame_ops = {
 487         .tx_frame_init = pn533_std_tx_frame_init,
 488         .tx_frame_finish = pn533_std_tx_frame_finish,
 489         .tx_update_payload_len = pn533_std_tx_update_payload_len,
 490         .tx_header_len = PN533_STD_FRAME_HEADER_LEN,
 491         .tx_tail_len = PN533_STD_FRAME_TAIL_LEN,
 492
 493         .rx_is_frame_valid = pn533_std_rx_frame_is_valid,
 494         .rx_frame_size = pn533_std_rx_frame_size,
 495         .rx_header_len = PN533_STD_FRAME_HEADER_LEN,
 496         .rx_tail_len = PN533_STD_FRAME_TAIL_LEN,
 497
 498         .max_payload_len =  PN533_STD_FRAME_MAX_PAYLOAD_LEN,
 499         .get_cmd_code = pn533_std_get_cmd_code,
 500 };
 501
 502 static bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
 503 {
 504         return (dev->ops->get_cmd_code(frame) == PN533_CMD_RESPONSE(dev->cmd));
 505 }
 506
 507
 508 static void pn533_wq_cmd_complete(struct work_struct *work)
 509 {
 510         struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
 511         int rc;
 512
 513         rc = dev->cmd_complete(dev, dev->cmd_complete_arg, dev->wq_in_error);
 514         if (rc != -EINPROGRESS)
 515                 queue_work(dev->wq, &dev->cmd_work);
 516 }
 517
 518 static void pn533_recv_response(struct urb *urb)
 519 {
 520         struct pn533 *dev = urb->context;
 521         u8 *in_frame;
 522
 523         switch (urb->status) {
 524         case 0:
 525                 break; /* success */
 526         case -ECONNRESET:
 527         case -ENOENT:
 528                 nfc_dev_dbg(&dev->interface->dev,
 529                             "The urb has been canceled (status %d)",
 530                             urb->status);
 531                 dev->wq_in_error = urb->status;
 532                 goto sched_wq;
 533         case -ESHUTDOWN:
 534         default:
 535                 nfc_dev_err(&dev->interface->dev,
 536                             "Urb failure (status %d)", urb->status);
 537                 dev->wq_in_error = urb->status;
 538                 goto sched_wq;
 539         }
 540
 541         in_frame = dev->in_urb->transfer_buffer;
 542
 543         nfc_dev_dbg(&dev->interface->dev, "Received a frame.");
 544         print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, in_frame,
 545                              dev->ops->rx_frame_size(in_frame), false);
 546
 547         if (!dev->ops->rx_is_frame_valid(in_frame)) {
 548                 nfc_dev_err(&dev->interface->dev, "Received an invalid frame");
 549                 dev->wq_in_error = -EIO;
 550                 goto sched_wq;
 551         }
 552
 553         if (!pn533_rx_frame_is_cmd_response(dev, in_frame)) {
 554                 nfc_dev_err(&dev->interface->dev,
 555                             "It it not the response to the last command");
 556                 dev->wq_in_error = -EIO;
 557                 goto sched_wq;
 558         }
 559
 560         dev->wq_in_error = 0;
 561
 562 sched_wq:
 563         queue_work(dev->wq, &dev->cmd_complete_work);
 564 }
 565
 566 static int pn533_submit_urb_for_response(struct pn533 *dev, gfp_t flags)
 567 {
 568         dev->in_urb->complete = pn533_recv_response;
 569
 570         return usb_submit_urb(dev->in_urb, flags);
 571 }
 572
 573 static void pn533_recv_ack(struct urb *urb)
 574 {
 575         struct pn533 *dev = urb->context;
 576         struct pn533_std_frame *in_frame;
 577         int rc;
 578
 579         switch (urb->status) {
 580         case 0:
 581                 break; /* success */
 582         case -ECONNRESET:
 583         case -ENOENT:
 584                 nfc_dev_dbg(&dev->interface->dev,
 585                             "The urb has been stopped (status %d)",
 586                             urb->status);
 587                 dev->wq_in_error = urb->status;
 588                 goto sched_wq;
 589         case -ESHUTDOWN:
 590         default:
 591                 nfc_dev_err(&dev->interface->dev,
 592                             "Urb failure (status %d)", urb->status);
 593                 dev->wq_in_error = urb->status;
 594                 goto sched_wq;
 595         }
 596
 597         in_frame = dev->in_urb->transfer_buffer;
 598
 599         if (!pn533_std_rx_frame_is_ack(in_frame)) {
 600                 nfc_dev_err(&dev->interface->dev, "Received an invalid ack");
 601                 dev->wq_in_error = -EIO;
 602                 goto sched_wq;
 603         }
 604
 605         rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
 606         if (rc) {
 607                 nfc_dev_err(&dev->interface->dev,
 608                             "usb_submit_urb failed with result %d", rc);
 609                 dev->wq_in_error = rc;
 610                 goto sched_wq;
 611         }
 612
 613         return;
 614
 615 sched_wq:
 616         queue_work(dev->wq, &dev->cmd_complete_work);
 617 }
 618
 619 static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags)
 620 {
 621         dev->in_urb->complete = pn533_recv_ack;
 622
 623         return usb_submit_urb(dev->in_urb, flags);
 624 }
 625
 626 static int pn533_send_ack(struct pn533 *dev, gfp_t flags)
 627 {
 628         u8 ack[PN533_STD_FRAME_ACK_SIZE] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
 629         /* spec 7.1.1.3:  Preamble, SoPC (2), ACK Code (2), Postamble */
 630         int rc;
 631
 632         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
 633
 634         dev->out_urb->transfer_buffer = ack;
 635         dev->out_urb->transfer_buffer_length = sizeof(ack);
 636         rc = usb_submit_urb(dev->out_urb, flags);
 637
 638         return rc;
 639 }
 640
 641 static int __pn533_send_frame_async(struct pn533 *dev,
 642                                         struct sk_buff *out,
 643                                         struct sk_buff *in,
 644                                         int in_len,
 645                                         pn533_cmd_complete_t cmd_complete,
 646                                         void *arg)
 647 {
 648         int rc;
 649
 650         dev->cmd = dev->ops->get_cmd_code(out->data);
 651         dev->cmd_complete = cmd_complete;
 652         dev->cmd_complete_arg = arg;
 653
 654         dev->out_urb->transfer_buffer = out->data;
 655         dev->out_urb->transfer_buffer_length = out->len;
 656
 657         dev->in_urb->transfer_buffer = in->data;
 658         dev->in_urb->transfer_buffer_length = in_len;
 659
 660         print_hex_dump_debug("PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
 661                              out->data, out->len, false);
 662
 663         rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
 664         if (rc)
 665                 return rc;
 666
 667         rc = pn533_submit_urb_for_ack(dev, GFP_KERNEL);
 668         if (rc)
 669                 goto error;
 670
 671         return 0;
 672
 673 error:
 674         usb_unlink_urb(dev->out_urb);
 675         return rc;
 676 }
 677
 678 static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
 679                                   struct sk_buff *skb)
 680 {
 681         /* payload is already there, just update datalen */
 682         int payload_len = skb->len;
 683         struct pn533_frame_ops *ops = dev->ops;
 684
 685
 686         skb_push(skb, ops->tx_header_len);
 687         skb_put(skb, ops->tx_tail_len);
 688
 689         ops->tx_frame_init(skb->data, cmd_code);
 690         ops->tx_update_payload_len(skb->data, payload_len);
 691         ops->tx_frame_finish(skb->data);
 692 }
 693
 694 struct pn533_send_async_complete_arg {
 695         pn533_send_async_complete_t  complete_cb;
 696         void *complete_cb_context;
 697         struct sk_buff *resp;
 698         struct sk_buff *req;
 699 };
 700
 701 static int pn533_send_async_complete(struct pn533 *dev, void *_arg, int status)
 702 {
 703         struct pn533_send_async_complete_arg *arg = _arg;
 704
 705         struct sk_buff *req = arg->req;
 706         struct sk_buff *resp = arg->resp;
 707
 708         int rc;
 709
 710         dev_kfree_skb(req);
 711
 712         if (status < 0) {
 713                 arg->complete_cb(dev, arg->complete_cb_context,
 714                                  ERR_PTR(status));
 715                 dev_kfree_skb(resp);
 716                 kfree(arg);
 717                 return status;
 718         }
 719
 720         skb_put(resp, dev->ops->rx_frame_size(resp->data));
 721         skb_pull(resp, dev->ops->rx_header_len);
 722         skb_trim(resp, resp->len - dev->ops->rx_tail_len);
 723
 724         rc = arg->complete_cb(dev, arg->complete_cb_context, resp);
 725
 726         kfree(arg);
 727         return rc;
 728 }
 729
 730 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
 731                               struct sk_buff *req, struct sk_buff *resp,
 732                               int resp_len,
 733                               pn533_send_async_complete_t complete_cb,
 734                               void *complete_cb_context)
 735 {
 736         struct pn533_cmd *cmd;
 737         struct pn533_send_async_complete_arg *arg;
 738         int rc = 0;
 739
 740         nfc_dev_dbg(&dev->interface->dev, "Sending command 0x%x", cmd_code);
 741
 742         arg = kzalloc(sizeof(*arg), GFP_KERNEL);
 743         if (!arg)
 744                 return -ENOMEM;
 745
 746         arg->complete_cb = complete_cb;
 747         arg->complete_cb_context = complete_cb_context;
 748         arg->resp = resp;
 749         arg->req = req;
 750
 751         pn533_build_cmd_frame(dev, cmd_code, req);
 752
 753         mutex_lock(&dev->cmd_lock);
 754
 755         if (!dev->cmd_pending) {
 756                 rc = __pn533_send_frame_async(dev, req, resp, resp_len,
 757                                               pn533_send_async_complete, arg);
 758                 if (rc)
 759                         goto error;
 760
 761                 dev->cmd_pending = 1;
 762                 goto unlock;
 763         }
 764
 765         nfc_dev_dbg(&dev->interface->dev, "%s Queueing command 0x%x", __func__,
 766                     cmd_code);
 767
 768         cmd = kzalloc(sizeof(struct pn533_cmd), GFP_KERNEL);
 769         if (!cmd) {
 770                 rc = -ENOMEM;
 771                 goto error;
 772         }
 773
 774         INIT_LIST_HEAD(&cmd->queue);
 775         cmd->cmd_code = cmd_code;
 776         cmd->req = req;
 777         cmd->resp = resp;
 778         cmd->resp_len = resp_len;
 779         cmd->arg = arg;
 780
 781         list_add_tail(&cmd->queue, &dev->cmd_queue);
 782
 783         goto unlock;
 784
 785 error:
 786         kfree(arg);
 787 unlock:
 788         mutex_unlock(&dev->cmd_lock);
 789         return rc;
 790 }
 791
 792 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
 793                                  struct sk_buff *req,
 794                                  pn533_send_async_complete_t complete_cb,
 795                                  void *complete_cb_context)
 796 {
 797         struct sk_buff *resp;
 798         int rc;
 799         int  resp_len = dev->ops->rx_header_len +
 800                         dev->ops->max_payload_len +
 801                         dev->ops->rx_tail_len;
 802
 803         resp = nfc_alloc_recv_skb(resp_len, GFP_KERNEL);
 804         if (!resp)
 805                 return -ENOMEM;
 806
 807         rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
 808                                 complete_cb_context);
 809         if (rc)
 810                 dev_kfree_skb(resp);
 811
 812         return rc;
 813 }
 814
 815 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
 816                                 struct sk_buff *req,
 817                                 pn533_send_async_complete_t complete_cb,
 818                                 void *complete_cb_context)
 819 {
 820         struct sk_buff *resp;
 821         int rc;
 822         int  resp_len = dev->ops->rx_header_len +
 823                         dev->ops->max_payload_len +
 824                         dev->ops->rx_tail_len;
 825
 826         resp = alloc_skb(resp_len, GFP_KERNEL);
 827         if (!resp)
 828                 return -ENOMEM;
 829
 830         rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
 831                                 complete_cb_context);
 832         if (rc)
 833                 dev_kfree_skb(resp);
 834
 835         return rc;
 836 }
 837
 838 /*
 839  * pn533_send_cmd_direct_async
 840  *
 841  * The function sends a piority cmd directly to the chip omiting the cmd
 842  * queue. It's intended to be used by chaining mechanism of received responses
 843  * where the host has to request every single chunk of data before scheduling
 844  * next cmd from the queue.
 845  */
 846 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
 847                                        struct sk_buff *req,
 848                                        pn533_send_async_complete_t complete_cb,
 849                                        void *complete_cb_context)
 850 {
 851         struct pn533_send_async_complete_arg *arg;
 852         struct sk_buff *resp;
 853         int rc;
 854         int resp_len = dev->ops->rx_header_len +
 855                        dev->ops->max_payload_len +
 856                        dev->ops->rx_tail_len;
 857
 858         resp = alloc_skb(resp_len, GFP_KERNEL);
 859         if (!resp)
 860                 return -ENOMEM;
 861
 862         arg = kzalloc(sizeof(*arg), GFP_KERNEL);
 863         if (!arg) {
 864                 dev_kfree_skb(resp);
 865                 return -ENOMEM;
 866         }
 867
 868         arg->complete_cb = complete_cb;
 869         arg->complete_cb_context = complete_cb_context;
 870         arg->resp = resp;
 871         arg->req = req;
 872
 873         pn533_build_cmd_frame(dev, cmd_code, req);
 874
 875         rc = __pn533_send_frame_async(dev, req, resp, resp_len,
 876                                       pn533_send_async_complete, arg);
 877         if (rc < 0) {
 878                 dev_kfree_skb(resp);
 879                 kfree(arg);
 880         }
 881
 882         return rc;
 883 }
 884
 885 static void pn533_wq_cmd(struct work_struct *work)
 886 {
 887         struct pn533 *dev = container_of(work, struct pn533, cmd_work);
 888         struct pn533_cmd *cmd;
 889         int rc;
 890
 891         mutex_lock(&dev->cmd_lock);
 892
 893         if (list_empty(&dev->cmd_queue)) {
 894                 dev->cmd_pending = 0;
 895                 mutex_unlock(&dev->cmd_lock);
 896                 return;
 897         }
 898
 899         cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
 900
 901         list_del(&cmd->queue);
 902
 903         mutex_unlock(&dev->cmd_lock);
 904
 905         rc = __pn533_send_frame_async(dev, cmd->req, cmd->resp, cmd->resp_len,
 906                                       pn533_send_async_complete, cmd->arg);
 907         if (rc < 0) {
 908                 dev_kfree_skb(cmd->req);
 909                 dev_kfree_skb(cmd->resp);
 910                 kfree(cmd->arg);
 911         }
 912
 913         kfree(cmd);
 914 }
 915
 916 struct pn533_sync_cmd_response {
 917         struct sk_buff *resp;
 918         struct completion done;
 919 };
 920
 921 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
 922                                     struct sk_buff *resp)
 923 {
 924         struct pn533_sync_cmd_response *arg = _arg;
 925
 926         arg->resp = resp;
 927         complete(&arg->done);
 928
 929         return 0;
 930 }
 931
 932 /*  pn533_send_cmd_sync
 933  *
 934  *  Please note the req parameter is freed inside the function to
 935  *  limit a number of return value interpretations by the caller.
 936  *
 937  *  1. negative in case of error during TX path -> req should be freed
 938  *
 939  *  2. negative in case of error during RX path -> req should not be freed
 940  *     as it's been already freed at the begining of RX path by
 941  *     async_complete_cb.
 942  *
 943  *  3. valid pointer in case of succesfult RX path
 944  *
 945  *  A caller has to check a return value with IS_ERR macro. If the test pass,
 946  *  the returned pointer is valid.
 947  *
 948  * */
 949 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
 950                                                struct sk_buff *req)
 951 {
 952         int rc;
 953         struct pn533_sync_cmd_response arg;
 954
 955         init_completion(&arg.done);
 956
 957         rc = pn533_send_cmd_async(dev, cmd_code, req,
 958                                   pn533_send_sync_complete, &arg);
 959         if (rc) {
 960                 dev_kfree_skb(req);
 961                 return ERR_PTR(rc);
 962         }
 963
 964         wait_for_completion(&arg.done);
 965
 966         return arg.resp;
 967 }
 968
 969 static void pn533_send_complete(struct urb *urb)
 970 {
 971         struct pn533 *dev = urb->context;
 972
 973         switch (urb->status) {
 974         case 0:
 975                 break; /* success */
 976         case -ECONNRESET:
 977         case -ENOENT:
 978                 nfc_dev_dbg(&dev->interface->dev,
 979                             "The urb has been stopped (status %d)",
 980                             urb->status);
 981                 break;
 982         case -ESHUTDOWN:
 983         default:
 984                 nfc_dev_err(&dev->interface->dev,
 985                             "Urb failure (status %d)", urb->status);
 986         }
 987 }
 988
 989 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
 990 {
 991         struct sk_buff *skb;
 992
 993         skb = alloc_skb(dev->ops->tx_header_len +
 994                         size +
 995                         dev->ops->tx_tail_len, GFP_KERNEL);
 996
 997         if (skb)
 998                 skb_reserve(skb, dev->ops->tx_header_len);
 999
1000         return skb;
1001 }
1002
1003 struct pn533_target_type_a {
1004         __be16 sens_res;
1005         u8 sel_res;
1006         u8 nfcid_len;
1007         u8 nfcid_data[];
1008 } __packed;
1009
1010
1011 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
1012 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
1013 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
1014
1015 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
1016 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
1017
1018 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
1019 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
1020
1021 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
1022 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
1023 #define PN533_TYPE_A_SEL_PROT_DEP 2
1024 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
1025
1026 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
1027                                                         int target_data_len)
1028 {
1029         u8 ssd;
1030         u8 platconf;
1031
1032         if (target_data_len < sizeof(struct pn533_target_type_a))
1033                 return false;
1034
1035         /* The lenght check of nfcid[] and ats[] are not being performed because
1036            the values are not being used */
1037
1038         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1039         ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
1040         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
1041
1042         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1043              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1044             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1045              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1046                 return false;
1047
1048         /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
1049         if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
1050                 return false;
1051
1052         return true;
1053 }
1054
1055 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
1056                                                         int tgt_data_len)
1057 {
1058         struct pn533_target_type_a *tgt_type_a;
1059
1060         tgt_type_a = (struct pn533_target_type_a *)tgt_data;
1061
1062         if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
1063                 return -EPROTO;
1064
1065         switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
1066         case PN533_TYPE_A_SEL_PROT_MIFARE:
1067                 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
1068                 break;
1069         case PN533_TYPE_A_SEL_PROT_ISO14443:
1070                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
1071                 break;
1072         case PN533_TYPE_A_SEL_PROT_DEP:
1073                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1074                 break;
1075         case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
1076                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
1077                                                         NFC_PROTO_NFC_DEP_MASK;
1078                 break;
1079         }
1080
1081         nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
1082         nfc_tgt->sel_res = tgt_type_a->sel_res;
1083         nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
1084         memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
1085
1086         return 0;
1087 }
1088
1089 struct pn533_target_felica {
1090         u8 pol_res;
1091         u8 opcode;
1092         u8 nfcid2[8];
1093         u8 pad[8];
1094         /* optional */
1095         u8 syst_code[];
1096 } __packed;
1097
1098 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
1099 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
1100
1101 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
1102                                                         int target_data_len)
1103 {
1104         if (target_data_len < sizeof(struct pn533_target_felica))
1105                 return false;
1106
1107         if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
1108                 return false;
1109
1110         return true;
1111 }
1112
1113 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
1114                                                         int tgt_data_len)
1115 {
1116         struct pn533_target_felica *tgt_felica;
1117
1118         tgt_felica = (struct pn533_target_felica *)tgt_data;
1119
1120         if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
1121                 return -EPROTO;
1122
1123         if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
1124             (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
1125                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1126         else
1127                 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
1128
1129         memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
1130         nfc_tgt->sensf_res_len = 9;
1131
1132         return 0;
1133 }
1134
1135 struct pn533_target_jewel {
1136         __be16 sens_res;
1137         u8 jewelid[4];
1138 } __packed;
1139
1140 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
1141                                                         int target_data_len)
1142 {
1143         u8 ssd;
1144         u8 platconf;
1145
1146         if (target_data_len < sizeof(struct pn533_target_jewel))
1147                 return false;
1148
1149         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1150         ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
1151         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
1152
1153         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1154              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1155             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1156              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1157                 return false;
1158
1159         return true;
1160 }
1161
1162 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
1163                                                         int tgt_data_len)
1164 {
1165         struct pn533_target_jewel *tgt_jewel;
1166
1167         tgt_jewel = (struct pn533_target_jewel *)tgt_data;
1168
1169         if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
1170                 return -EPROTO;
1171
1172         nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
1173         nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
1174         nfc_tgt->nfcid1_len = 4;
1175         memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
1176
1177         return 0;
1178 }
1179
1180 struct pn533_type_b_prot_info {
1181         u8 bitrate;
1182         u8 fsci_type;
1183         u8 fwi_adc_fo;
1184 } __packed;
1185
1186 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
1187 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
1188 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
1189
1190 struct pn533_type_b_sens_res {
1191         u8 opcode;
1192         u8 nfcid[4];
1193         u8 appdata[4];
1194         struct pn533_type_b_prot_info prot_info;
1195 } __packed;
1196
1197 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
1198
1199 struct pn533_target_type_b {
1200         struct pn533_type_b_sens_res sensb_res;
1201         u8 attrib_res_len;
1202         u8 attrib_res[];
1203 } __packed;
1204
1205 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
1206                                                         int target_data_len)
1207 {
1208         if (target_data_len < sizeof(struct pn533_target_type_b))
1209                 return false;
1210
1211         if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
1212                 return false;
1213
1214         if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
1215                                                 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
1216                 return false;
1217
1218         return true;
1219 }
1220
1221 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
1222                                                         int tgt_data_len)
1223 {
1224         struct pn533_target_type_b *tgt_type_b;
1225
1226         tgt_type_b = (struct pn533_target_type_b *)tgt_data;
1227
1228         if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
1229                 return -EPROTO;
1230
1231         nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
1232
1233         return 0;
1234 }
1235
1236 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
1237                               int tgdata_len)
1238 {
1239         struct nfc_target nfc_tgt;
1240         int rc;
1241
1242         nfc_dev_dbg(&dev->interface->dev, "%s - modulation=%d", __func__,
1243                     dev->poll_mod_curr);
1244
1245         if (tg != 1)
1246                 return -EPROTO;
1247
1248         memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1249
1250         switch (dev->poll_mod_curr) {
1251         case PN533_POLL_MOD_106KBPS_A:
1252                 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
1253                 break;
1254         case PN533_POLL_MOD_212KBPS_FELICA:
1255         case PN533_POLL_MOD_424KBPS_FELICA:
1256                 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
1257                 break;
1258         case PN533_POLL_MOD_106KBPS_JEWEL:
1259                 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
1260                 break;
1261         case PN533_POLL_MOD_847KBPS_B:
1262                 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
1263                 break;
1264         default:
1265                 nfc_dev_err(&dev->interface->dev,
1266                             "Unknown current poll modulation");
1267                 return -EPROTO;
1268         }
1269
1270         if (rc)
1271                 return rc;
1272
1273         if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1274                 nfc_dev_dbg(&dev->interface->dev,
1275                             "The Tg found doesn't have the desired protocol");
1276                 return -EAGAIN;
1277         }
1278
1279         nfc_dev_dbg(&dev->interface->dev,
1280                     "Target found - supported protocols: 0x%x",
1281                     nfc_tgt.supported_protocols);
1282
1283         dev->tgt_available_prots = nfc_tgt.supported_protocols;
1284
1285         nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1286
1287         return 0;
1288 }
1289
1290 static inline void pn533_poll_next_mod(struct pn533 *dev)
1291 {
1292         dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
1293 }
1294
1295 static void pn533_poll_reset_mod_list(struct pn533 *dev)
1296 {
1297         dev->poll_mod_count = 0;
1298 }
1299
1300 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
1301 {
1302         dev->poll_mod_active[dev->poll_mod_count] =
1303                 (struct pn533_poll_modulations *)&poll_mod[mod_index];
1304         dev->poll_mod_count++;
1305 }
1306
1307 static void pn533_poll_create_mod_list(struct pn533 *dev,
1308                                        u32 im_protocols, u32 tm_protocols)
1309 {
1310         pn533_poll_reset_mod_list(dev);
1311
1312         if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
1313             (im_protocols & NFC_PROTO_ISO14443_MASK) ||
1314             (im_protocols & NFC_PROTO_NFC_DEP_MASK))
1315                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
1316
1317         if (im_protocols & NFC_PROTO_FELICA_MASK ||
1318             im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1319                 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
1320                 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
1321         }
1322
1323         if (im_protocols & NFC_PROTO_JEWEL_MASK)
1324                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
1325
1326         if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1327                 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
1328
1329         if (tm_protocols)
1330                 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
1331 }
1332
1333 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
1334 {
1335         u8 nbtg, tg, *tgdata;
1336         int rc, tgdata_len;
1337
1338         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1339
1340         nbtg = resp->data[0];
1341         tg = resp->data[1];
1342         tgdata = &resp->data[2];
1343         tgdata_len = resp->len - 2;  /* nbtg + tg */
1344
1345         if (nbtg) {
1346                 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1347
1348                 /* We must stop the poll after a valid target found */
1349                 if (rc == 0) {
1350                         pn533_poll_reset_mod_list(dev);
1351                         return 0;
1352                 }
1353         }
1354
1355         return -EAGAIN;
1356 }
1357
1358 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1359 {
1360         struct sk_buff *skb;
1361         u8 *felica, *nfcid3, *gb;
1362
1363         u8 *gbytes = dev->gb;
1364         size_t gbytes_len = dev->gb_len;
1365
1366         u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1367                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1368                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1369                                 0xff, 0xff}; /* System code */
1370
1371         u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1372                                0x0, 0x0, 0x0,
1373                                0x40}; /* SEL_RES for DEP */
1374
1375         unsigned int skb_len = 36 + /* mode (1), mifare (6),
1376                                        felica (18), nfcid3 (10), gb_len (1) */
1377                                gbytes_len +
1378                                1;  /* len Tk*/
1379
1380         skb = pn533_alloc_skb(dev, skb_len);
1381         if (!skb)
1382                 return NULL;
1383
1384         /* DEP support only */
1385         *skb_put(skb, 1) = PN533_INIT_TARGET_DEP;
1386
1387         /* MIFARE params */
1388         memcpy(skb_put(skb, 6), mifare_params, 6);
1389
1390         /* Felica params */
1391         felica = skb_put(skb, 18);
1392         memcpy(felica, felica_params, 18);
1393         get_random_bytes(felica + 2, 6);
1394
1395         /* NFCID3 */
1396         nfcid3 = skb_put(skb, 10);
1397         memset(nfcid3, 0, 10);
1398         memcpy(nfcid3, felica, 8);
1399
1400         /* General bytes */
1401         *skb_put(skb, 1) = gbytes_len;
1402
1403         gb = skb_put(skb, gbytes_len);
1404         memcpy(gb, gbytes, gbytes_len);
1405
1406         /* Len Tk */
1407         *skb_put(skb, 1) = 0;
1408
1409         return skb;
1410 }
1411
1412 #define PN533_CMD_DATAEXCH_HEAD_LEN 1
1413 #define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
1414 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1415                                       struct sk_buff *resp)
1416 {
1417         u8 status;
1418
1419         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1420
1421         if (IS_ERR(resp))
1422                 return PTR_ERR(resp);
1423
1424         status = resp->data[0];
1425         skb_pull(resp, sizeof(status));
1426
1427         if (status != 0) {
1428                 nfc_tm_deactivated(dev->nfc_dev);
1429                 dev->tgt_mode = 0;
1430                 dev_kfree_skb(resp);
1431                 return 0;
1432         }
1433
1434         return nfc_tm_data_received(dev->nfc_dev, resp);
1435 }
1436
1437 static void pn533_wq_tg_get_data(struct work_struct *work)
1438 {
1439         struct pn533 *dev = container_of(work, struct pn533, tg_work);
1440
1441         struct sk_buff *skb;
1442         int rc;
1443
1444         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1445
1446         skb = pn533_alloc_skb(dev, 0);
1447         if (!skb)
1448                 return;
1449
1450         rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1451                                    pn533_tm_get_data_complete, NULL);
1452
1453         if (rc < 0)
1454                 dev_kfree_skb(skb);
1455
1456         return;
1457 }
1458
1459 #define ATR_REQ_GB_OFFSET 17
1460 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1461 {
1462         u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1463         size_t gb_len;
1464         int rc;
1465
1466         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1467
1468         if (resp->len < ATR_REQ_GB_OFFSET + 1)
1469                 return -EINVAL;
1470
1471         mode = resp->data[0];
1472         cmd = &resp->data[1];
1473
1474         nfc_dev_dbg(&dev->interface->dev, "Target mode 0x%x len %d\n",
1475                     mode, resp->len);
1476
1477         if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1478             PN533_INIT_TARGET_RESP_ACTIVE)
1479                 comm_mode = NFC_COMM_ACTIVE;
1480
1481         if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0)  /* Only DEP supported */
1482                 return -EOPNOTSUPP;
1483
1484         gb = cmd + ATR_REQ_GB_OFFSET;
1485         gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1486
1487         rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1488                               comm_mode, gb, gb_len);
1489         if (rc < 0) {
1490                 nfc_dev_err(&dev->interface->dev,
1491                             "Error when signaling target activation");
1492                 return rc;
1493         }
1494
1495         dev->tgt_mode = 1;
1496         queue_work(dev->wq, &dev->tg_work);
1497
1498         return 0;
1499 }
1500
1501 static void pn533_listen_mode_timer(unsigned long data)
1502 {
1503         struct pn533 *dev = (struct pn533 *)data;
1504
1505         nfc_dev_dbg(&dev->interface->dev, "Listen mode timeout");
1506
1507         /* An ack will cancel the last issued command (poll) */
1508         pn533_send_ack(dev, GFP_ATOMIC);
1509
1510         dev->cancel_listen = 1;
1511
1512         pn533_poll_next_mod(dev);
1513
1514         queue_work(dev->wq, &dev->poll_work);
1515 }
1516
1517 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1518                                struct sk_buff *resp)
1519 {
1520         struct pn533_poll_modulations *cur_mod;
1521         int rc;
1522
1523         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1524
1525         if (IS_ERR(resp)) {
1526                 rc = PTR_ERR(resp);
1527
1528                 nfc_dev_err(&dev->interface->dev, "%s  Poll complete error %d",
1529                             __func__, rc);
1530
1531                 if (rc == -ENOENT) {
1532                         if (dev->poll_mod_count != 0)
1533                                 return rc;
1534                         else
1535                                 goto stop_poll;
1536                 } else if (rc < 0) {
1537                         nfc_dev_err(&dev->interface->dev,
1538                                     "Error %d when running poll", rc);
1539                         goto stop_poll;
1540                 }
1541         }
1542
1543         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1544
1545         if (cur_mod->len == 0) { /* Target mode */
1546                 del_timer(&dev->listen_timer);
1547                 rc = pn533_init_target_complete(dev, resp);
1548                 goto done;
1549         }
1550
1551         /* Initiator mode */
1552         rc = pn533_start_poll_complete(dev, resp);
1553         if (!rc)
1554                 goto done;
1555
1556         if (!dev->poll_mod_count) {
1557                 nfc_dev_dbg(&dev->interface->dev, "Polling has been stoped.");
1558                 goto done;
1559         }
1560
1561         pn533_poll_next_mod(dev);
1562         queue_work(dev->wq, &dev->poll_work);
1563
1564 done:
1565         dev_kfree_skb(resp);
1566         return rc;
1567
1568 stop_poll:
1569         nfc_dev_err(&dev->interface->dev, "Polling operation has been stopped");
1570
1571         pn533_poll_reset_mod_list(dev);
1572         dev->poll_protocols = 0;
1573         return rc;
1574 }
1575
1576 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1577                                         struct pn533_poll_modulations *mod)
1578 {
1579         struct sk_buff *skb;
1580
1581         skb = pn533_alloc_skb(dev, mod->len);
1582         if (!skb)
1583                 return NULL;
1584
1585         memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
1586
1587         return skb;
1588 }
1589
1590 static int pn533_send_poll_frame(struct pn533 *dev)
1591 {
1592         struct pn533_poll_modulations *mod;
1593         struct sk_buff *skb;
1594         int rc;
1595         u8 cmd_code;
1596
1597         mod = dev->poll_mod_active[dev->poll_mod_curr];
1598
1599         nfc_dev_dbg(&dev->interface->dev, "%s mod len %d\n",
1600                     __func__, mod->len);
1601
1602         if (mod->len == 0) {  /* Listen mode */
1603                 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1604                 skb = pn533_alloc_poll_tg_frame(dev);
1605         } else {  /* Polling mode */
1606                 cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
1607                 skb = pn533_alloc_poll_in_frame(dev, mod);
1608         }
1609
1610         if (!skb) {
1611                 nfc_dev_err(&dev->interface->dev, "Failed to allocate skb.");
1612                 return -ENOMEM;
1613         }
1614
1615         rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1616                                   NULL);
1617         if (rc < 0) {
1618                 dev_kfree_skb(skb);
1619                 nfc_dev_err(&dev->interface->dev, "Polling loop error %d", rc);
1620         }
1621
1622         return rc;
1623 }
1624
1625 static void pn533_wq_poll(struct work_struct *work)
1626 {
1627         struct pn533 *dev = container_of(work, struct pn533, poll_work);
1628         struct pn533_poll_modulations *cur_mod;
1629         int rc;
1630
1631         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1632
1633         nfc_dev_dbg(&dev->interface->dev,
1634                     "%s cancel_listen %d modulation len %d",
1635                     __func__, dev->cancel_listen, cur_mod->len);
1636
1637         if (dev->cancel_listen == 1) {
1638                 dev->cancel_listen = 0;
1639                 usb_kill_urb(dev->in_urb);
1640         }
1641
1642         rc = pn533_send_poll_frame(dev);
1643         if (rc)
1644                 return;
1645
1646         if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1647                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1648
1649         return;
1650 }
1651
1652 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1653                             u32 im_protocols, u32 tm_protocols)
1654 {
1655         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1656
1657         nfc_dev_dbg(&dev->interface->dev,
1658                     "%s: im protocols 0x%x tm protocols 0x%x",
1659                     __func__, im_protocols, tm_protocols);
1660
1661         if (dev->tgt_active_prot) {
1662                 nfc_dev_err(&dev->interface->dev,
1663                             "Cannot poll with a target already activated");
1664                 return -EBUSY;
1665         }
1666
1667         if (dev->tgt_mode) {
1668                 nfc_dev_err(&dev->interface->dev,
1669                             "Cannot poll while already being activated");
1670                 return -EBUSY;
1671         }
1672
1673         if (tm_protocols) {
1674                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1675                 if (dev->gb == NULL)
1676                         tm_protocols = 0;
1677         }
1678
1679         dev->poll_mod_curr = 0;
1680         pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1681         dev->poll_protocols = im_protocols;
1682         dev->listen_protocols = tm_protocols;
1683
1684         return pn533_send_poll_frame(dev);
1685 }
1686
1687 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1688 {
1689         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1690
1691         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1692
1693         del_timer(&dev->listen_timer);
1694
1695         if (!dev->poll_mod_count) {
1696                 nfc_dev_dbg(&dev->interface->dev,
1697                             "Polling operation was not running");
1698                 return;
1699         }
1700
1701         /* An ack will cancel the last issued command (poll) */
1702         pn533_send_ack(dev, GFP_KERNEL);
1703
1704         /* prevent pn533_start_poll_complete to issue a new poll meanwhile */
1705         usb_kill_urb(dev->in_urb);
1706
1707         pn533_poll_reset_mod_list(dev);
1708 }
1709
1710 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1711 {
1712         struct pn533_cmd_activate_response *rsp;
1713         u16 gt_len;
1714         int rc;
1715
1716         struct sk_buff *skb;
1717         struct sk_buff *resp;
1718
1719         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1720
1721         skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1722         if (!skb)
1723                 return -ENOMEM;
1724
1725         *skb_put(skb, sizeof(u8)) = 1; /* TG */
1726         *skb_put(skb, sizeof(u8)) = 0; /* Next */
1727
1728         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1729         if (IS_ERR(resp))
1730                 return PTR_ERR(resp);
1731
1732         rsp = (struct pn533_cmd_activate_response *)resp->data;
1733         rc = rsp->status & PN533_CMD_RET_MASK;
1734         if (rc != PN533_CMD_RET_SUCCESS) {
1735                 nfc_dev_err(&dev->interface->dev,
1736                             "Target activation failed (error 0x%x)", rc);
1737                 dev_kfree_skb(resp);
1738                 return -EIO;
1739         }
1740
1741         /* ATR_RES general bytes are located at offset 16 */
1742         gt_len = resp->len - 16;
1743         rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1744
1745         dev_kfree_skb(resp);
1746         return rc;
1747 }
1748
1749 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1750                                  struct nfc_target *target, u32 protocol)
1751 {
1752         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1753         int rc;
1754
1755         nfc_dev_dbg(&dev->interface->dev, "%s - protocol=%u", __func__,
1756                     protocol);
1757
1758         if (dev->poll_mod_count) {
1759                 nfc_dev_err(&dev->interface->dev,
1760                             "Cannot activate while polling");
1761                 return -EBUSY;
1762         }
1763
1764         if (dev->tgt_active_prot) {
1765                 nfc_dev_err(&dev->interface->dev,
1766                             "There is already an active target");
1767                 return -EBUSY;
1768         }
1769
1770         if (!dev->tgt_available_prots) {
1771                 nfc_dev_err(&dev->interface->dev,
1772                             "There is no available target to activate");
1773                 return -EINVAL;
1774         }
1775
1776         if (!(dev->tgt_available_prots & (1 << protocol))) {
1777                 nfc_dev_err(&dev->interface->dev,
1778                             "Target doesn't support requested proto %u",
1779                             protocol);
1780                 return -EINVAL;
1781         }
1782
1783         if (protocol == NFC_PROTO_NFC_DEP) {
1784                 rc = pn533_activate_target_nfcdep(dev);
1785                 if (rc) {
1786                         nfc_dev_err(&dev->interface->dev,
1787                                     "Activating target with DEP failed %d", rc);
1788                         return rc;
1789                 }
1790         }
1791
1792         dev->tgt_active_prot = protocol;
1793         dev->tgt_available_prots = 0;
1794
1795         return 0;
1796 }
1797
1798 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1799                                     struct nfc_target *target)
1800 {
1801         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1802
1803         struct sk_buff *skb;
1804         struct sk_buff *resp;
1805
1806         int rc;
1807
1808         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1809
1810         if (!dev->tgt_active_prot) {
1811                 nfc_dev_err(&dev->interface->dev, "There is no active target");
1812                 return;
1813         }
1814
1815         dev->tgt_active_prot = 0;
1816         skb_queue_purge(&dev->resp_q);
1817
1818         skb = pn533_alloc_skb(dev, sizeof(u8));
1819         if (!skb)
1820                 return;
1821
1822         *skb_put(skb, 1) = 1; /* TG*/
1823
1824         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_RELEASE, skb);
1825         if (IS_ERR(resp))
1826                 return;
1827
1828         rc = resp->data[0] & PN533_CMD_RET_MASK;
1829         if (rc != PN533_CMD_RET_SUCCESS)
1830                 nfc_dev_err(&dev->interface->dev,
1831                             "Error 0x%x when releasing the target", rc);
1832
1833         dev_kfree_skb(resp);
1834         return;
1835 }
1836
1837
1838 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1839                                          struct sk_buff *resp)
1840 {
1841         struct pn533_cmd_jump_dep_response *rsp;
1842         u8 target_gt_len;
1843         int rc;
1844         u8 active = *(u8 *)arg;
1845
1846         kfree(arg);
1847
1848         if (IS_ERR(resp))
1849                 return PTR_ERR(resp);
1850
1851         if (dev->tgt_available_prots &&
1852             !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1853                 nfc_dev_err(&dev->interface->dev,
1854                             "The target does not support DEP");
1855                 rc =  -EINVAL;
1856                 goto error;
1857         }
1858
1859         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1860
1861         rc = rsp->status & PN533_CMD_RET_MASK;
1862         if (rc != PN533_CMD_RET_SUCCESS) {
1863                 nfc_dev_err(&dev->interface->dev,
1864                             "Bringing DEP link up failed (error 0x%x)", rc);
1865                 goto error;
1866         }
1867
1868         if (!dev->tgt_available_prots) {
1869                 struct nfc_target nfc_target;
1870
1871                 nfc_dev_dbg(&dev->interface->dev, "Creating new target");
1872
1873                 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1874                 nfc_target.nfcid1_len = 10;
1875                 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1876                 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1877                 if (rc)
1878                         goto error;
1879
1880                 dev->tgt_available_prots = 0;
1881         }
1882
1883         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1884
1885         /* ATR_RES general bytes are located at offset 17 */
1886         target_gt_len = resp->len - 17;
1887         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1888                                           rsp->gt, target_gt_len);
1889         if (rc == 0)
1890                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1891                                         dev->nfc_dev->targets[0].idx,
1892                                         !active, NFC_RF_INITIATOR);
1893
1894 error:
1895         dev_kfree_skb(resp);
1896         return rc;
1897 }
1898
1899 static int pn533_mod_to_baud(struct pn533 *dev)
1900 {
1901         switch (dev->poll_mod_curr) {
1902         case PN533_POLL_MOD_106KBPS_A:
1903                 return 0;
1904         case PN533_POLL_MOD_212KBPS_FELICA:
1905                 return 1;
1906         case PN533_POLL_MOD_424KBPS_FELICA:
1907                 return 2;
1908         default:
1909                 return -EINVAL;
1910         }
1911 }
1912
1913 #define PASSIVE_DATA_LEN 5
1914 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1915                              u8 comm_mode, u8 *gb, size_t gb_len)
1916 {
1917         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1918         struct sk_buff *skb;
1919         int rc, baud, skb_len;
1920         u8 *next, *arg;
1921
1922         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1923
1924         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1925
1926         if (dev->poll_mod_count) {
1927                 nfc_dev_err(&dev->interface->dev,
1928                             "Cannot bring the DEP link up while polling");
1929                 return -EBUSY;
1930         }
1931
1932         if (dev->tgt_active_prot) {
1933                 nfc_dev_err(&dev->interface->dev,
1934                             "There is already an active target");
1935                 return -EBUSY;
1936         }
1937
1938         baud = pn533_mod_to_baud(dev);
1939         if (baud < 0) {
1940                 nfc_dev_err(&dev->interface->dev,
1941                             "Invalid curr modulation %d", dev->poll_mod_curr);
1942                 return baud;
1943         }
1944
1945         skb_len = 3 + gb_len; /* ActPass + BR + Next */
1946         if (comm_mode == NFC_COMM_PASSIVE)
1947                 skb_len += PASSIVE_DATA_LEN;
1948
1949         skb = pn533_alloc_skb(dev, skb_len);
1950         if (!skb)
1951                 return -ENOMEM;
1952
1953         *skb_put(skb, 1) = !comm_mode;  /* ActPass */
1954         *skb_put(skb, 1) = baud;  /* Baud rate */
1955
1956         next = skb_put(skb, 1);  /* Next */
1957         *next = 0;
1958
1959         if (comm_mode == NFC_COMM_PASSIVE && baud > 0) {
1960                 memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data,
1961                        PASSIVE_DATA_LEN);
1962                 *next |= 1;
1963         }
1964
1965         if (gb != NULL && gb_len > 0) {
1966                 memcpy(skb_put(skb, gb_len), gb, gb_len);
1967                 *next |= 4; /* We have some Gi */
1968         } else {
1969                 *next = 0;
1970         }
1971
1972         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
1973         if (!arg) {
1974                 dev_kfree_skb(skb);
1975                 return -ENOMEM;
1976         }
1977
1978         *arg = !comm_mode;
1979
1980         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1981                                   pn533_in_dep_link_up_complete, arg);
1982
1983         if (rc < 0) {
1984                 dev_kfree_skb(skb);
1985                 kfree(arg);
1986         }
1987
1988         return rc;
1989 }
1990
1991 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
1992 {
1993         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1994
1995         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1996
1997         pn533_poll_reset_mod_list(dev);
1998
1999         if (dev->tgt_mode || dev->tgt_active_prot) {
2000                 pn533_send_ack(dev, GFP_KERNEL);
2001                 usb_kill_urb(dev->in_urb);
2002         }
2003
2004         dev->tgt_active_prot = 0;
2005         dev->tgt_mode = 0;
2006
2007         skb_queue_purge(&dev->resp_q);
2008
2009         return 0;
2010 }
2011
2012 struct pn533_data_exchange_arg {
2013         data_exchange_cb_t cb;
2014         void *cb_context;
2015 };
2016
2017 static struct sk_buff *pn533_build_response(struct pn533 *dev)
2018 {
2019         struct sk_buff *skb, *tmp, *t;
2020         unsigned int skb_len = 0, tmp_len = 0;
2021
2022         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2023
2024         if (skb_queue_empty(&dev->resp_q))
2025                 return NULL;
2026
2027         if (skb_queue_len(&dev->resp_q) == 1) {
2028                 skb = skb_dequeue(&dev->resp_q);
2029                 goto out;
2030         }
2031
2032         skb_queue_walk_safe(&dev->resp_q, tmp, t)
2033                 skb_len += tmp->len;
2034
2035         nfc_dev_dbg(&dev->interface->dev, "%s total length %d\n",
2036                     __func__, skb_len);
2037
2038         skb = alloc_skb(skb_len, GFP_KERNEL);
2039         if (skb == NULL)
2040                 goto out;
2041
2042         skb_put(skb, skb_len);
2043
2044         skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2045                 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2046                 tmp_len += tmp->len;
2047         }
2048
2049 out:
2050         skb_queue_purge(&dev->resp_q);
2051
2052         return skb;
2053 }
2054
2055 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2056                                         struct sk_buff *resp)
2057 {
2058         struct pn533_data_exchange_arg *arg = _arg;
2059         struct sk_buff *skb;
2060         int rc = 0;
2061         u8 status, ret, mi;
2062
2063         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2064
2065         if (IS_ERR(resp)) {
2066                 rc = PTR_ERR(resp);
2067                 goto _error;
2068         }
2069
2070         status = resp->data[0];
2071         ret = status & PN533_CMD_RET_MASK;
2072         mi = status & PN533_CMD_MI_MASK;
2073
2074         skb_pull(resp, sizeof(status));
2075
2076         if (ret != PN533_CMD_RET_SUCCESS) {
2077                 nfc_dev_err(&dev->interface->dev,
2078                             "Exchanging data failed (error 0x%x)", ret);
2079                 rc = -EIO;
2080                 goto error;
2081         }
2082
2083         skb_queue_tail(&dev->resp_q, resp);
2084
2085         if (mi) {
2086                 dev->cmd_complete_mi_arg = arg;
2087                 queue_work(dev->wq, &dev->mi_work);
2088                 return -EINPROGRESS;
2089         }
2090
2091         skb = pn533_build_response(dev);
2092         if (!skb)
2093                 goto error;
2094
2095         arg->cb(arg->cb_context, skb, 0);
2096         kfree(arg);
2097         return 0;
2098
2099 error:
2100         dev_kfree_skb(resp);
2101 _error:
2102         skb_queue_purge(&dev->resp_q);
2103         arg->cb(arg->cb_context, NULL, rc);
2104         kfree(arg);
2105         return rc;
2106 }
2107
2108 static int pn533_transceive(struct nfc_dev *nfc_dev,
2109                             struct nfc_target *target, struct sk_buff *skb,
2110                             data_exchange_cb_t cb, void *cb_context)
2111 {
2112         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2113         struct pn533_data_exchange_arg *arg = NULL;
2114         int rc;
2115
2116         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2117
2118         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2119                 /* TODO: Implement support to multi-part data exchange */
2120                 nfc_dev_err(&dev->interface->dev,
2121                             "Data length greater than the max allowed: %d",
2122                             PN533_CMD_DATAEXCH_DATA_MAXLEN);
2123                 rc = -ENOSYS;
2124                 goto error;
2125         }
2126
2127         if (!dev->tgt_active_prot) {
2128                 nfc_dev_err(&dev->interface->dev,
2129                             "Can't exchange data if there is no active target");
2130                 rc = -EINVAL;
2131                 goto error;
2132         }
2133
2134         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2135         if (!arg) {
2136                 rc = -ENOMEM;
2137                 goto error;
2138         }
2139
2140         arg->cb = cb;
2141         arg->cb_context = cb_context;
2142
2143         switch (dev->device_type) {
2144         case PN533_DEVICE_PASORI:
2145                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2146                         rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2147                                                    skb,
2148                                                    pn533_data_exchange_complete,
2149                                                    arg);
2150
2151                         break;
2152                 }
2153         default:
2154                 *skb_push(skb, sizeof(u8)) =  1; /*TG*/
2155
2156                 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2157                                            skb, pn533_data_exchange_complete,
2158                                            arg);
2159
2160                 break;
2161         }
2162
2163         if (rc < 0) /* rc from send_async */
2164                 goto error;
2165
2166         return 0;
2167
2168 error:
2169         kfree(arg);
2170         dev_kfree_skb(skb);
2171         return rc;
2172 }
2173
2174 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2175                                   struct sk_buff *resp)
2176 {
2177         u8 status;
2178
2179         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2180
2181         if (IS_ERR(resp))
2182                 return PTR_ERR(resp);
2183
2184         status = resp->data[0];
2185
2186         dev_kfree_skb(resp);
2187
2188         if (status != 0) {
2189                 nfc_tm_deactivated(dev->nfc_dev);
2190
2191                 dev->tgt_mode = 0;
2192
2193                 return 0;
2194         }
2195
2196         queue_work(dev->wq, &dev->tg_work);
2197
2198         return 0;
2199 }
2200
2201 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2202 {
2203         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2204         int rc;
2205
2206         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2207
2208         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2209                 nfc_dev_err(&dev->interface->dev,
2210                             "Data length greater than the max allowed: %d",
2211                             PN533_CMD_DATAEXCH_DATA_MAXLEN);
2212                 return -ENOSYS;
2213         }
2214
2215         rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2216                                    pn533_tm_send_complete, NULL);
2217         if (rc < 0)
2218                 dev_kfree_skb(skb);
2219
2220         return rc;
2221 }
2222
2223 static void pn533_wq_mi_recv(struct work_struct *work)
2224 {
2225         struct pn533 *dev = container_of(work, struct pn533, mi_work);
2226
2227         struct sk_buff *skb;
2228         int rc;
2229
2230         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2231
2232         skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2233         if (!skb)
2234                 goto error;
2235
2236         switch (dev->device_type) {
2237         case PN533_DEVICE_PASORI:
2238                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2239                         rc = pn533_send_cmd_direct_async(dev,
2240                                                 PN533_CMD_IN_COMM_THRU,
2241                                                 skb,
2242                                                 pn533_data_exchange_complete,
2243                                                  dev->cmd_complete_mi_arg);
2244
2245                         break;
2246                 }
2247         default:
2248                 *skb_put(skb, sizeof(u8)) =  1; /*TG*/
2249
2250                 rc = pn533_send_cmd_direct_async(dev,
2251                                                  PN533_CMD_IN_DATA_EXCHANGE,
2252                                                  skb,
2253                                                  pn533_data_exchange_complete,
2254                                                  dev->cmd_complete_mi_arg);
2255
2256                 break;
2257         }
2258
2259         if (rc == 0) /* success */
2260                 return;
2261
2262         nfc_dev_err(&dev->interface->dev,
2263                     "Error %d when trying to perform data_exchange", rc);
2264
2265         dev_kfree_skb(skb);
2266         kfree(dev->cmd_complete_arg);
2267
2268 error:
2269         pn533_send_ack(dev, GFP_KERNEL);
2270         queue_work(dev->wq, &dev->cmd_work);
2271 }
2272
2273 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2274                                                                 u8 cfgdata_len)
2275 {
2276         struct sk_buff *skb;
2277         struct sk_buff *resp;
2278
2279         int skb_len;
2280
2281         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2282
2283         skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2284
2285         skb = pn533_alloc_skb(dev, skb_len);
2286         if (!skb)
2287                 return -ENOMEM;
2288
2289         *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2290         memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2291
2292         resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2293         if (IS_ERR(resp))
2294                 return PTR_ERR(resp);
2295
2296         dev_kfree_skb(resp);
2297         return 0;
2298 }
2299
2300 static int pn533_get_firmware_version(struct pn533 *dev,
2301                                       struct pn533_fw_version *fv)
2302 {
2303         struct sk_buff *skb;
2304         struct sk_buff *resp;
2305
2306         skb = pn533_alloc_skb(dev, 0);
2307         if (!skb)
2308                 return -ENOMEM;
2309
2310         resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2311         if (IS_ERR(resp))
2312                 return PTR_ERR(resp);
2313
2314         fv->ic = resp->data[0];
2315         fv->ver = resp->data[1];
2316         fv->rev = resp->data[2];
2317         fv->support = resp->data[3];
2318
2319         dev_kfree_skb(resp);
2320         return 0;
2321 }
2322
2323 static int pn533_pasori_fw_reset(struct pn533 *dev)
2324 {
2325         struct sk_buff *skb;
2326         struct sk_buff *resp;
2327
2328         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2329
2330         skb = pn533_alloc_skb(dev, sizeof(u8));
2331         if (!skb)
2332                 return -ENOMEM;
2333
2334         *skb_put(skb, sizeof(u8)) = 0x1;
2335
2336         resp = pn533_send_cmd_sync(dev, 0x18, skb);
2337         if (IS_ERR(resp))
2338                 return PTR_ERR(resp);
2339
2340         dev_kfree_skb(resp);
2341
2342         return 0;
2343 }
2344
2345 static struct nfc_ops pn533_nfc_ops = {
2346         .dev_up = NULL,
2347         .dev_down = NULL,
2348         .dep_link_up = pn533_dep_link_up,
2349         .dep_link_down = pn533_dep_link_down,
2350         .start_poll = pn533_start_poll,
2351         .stop_poll = pn533_stop_poll,
2352         .activate_target = pn533_activate_target,
2353         .deactivate_target = pn533_deactivate_target,
2354         .im_transceive = pn533_transceive,
2355         .tm_send = pn533_tm_send,
2356 };
2357
2358 static int pn533_setup(struct pn533 *dev)
2359 {
2360         struct pn533_config_max_retries max_retries;
2361         struct pn533_config_timing timing;
2362         u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2363         int rc;
2364
2365         switch (dev->device_type) {
2366         case PN533_DEVICE_STD:
2367                 max_retries.mx_rty_atr = PN533_CONFIG_MAX_RETRIES_ENDLESS;
2368                 max_retries.mx_rty_psl = 2;
2369                 max_retries.mx_rty_passive_act =
2370                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2371
2372                 timing.rfu = PN533_CONFIG_TIMING_102;
2373                 timing.atr_res_timeout = PN533_CONFIG_TIMING_204;
2374                 timing.dep_timeout = PN533_CONFIG_TIMING_409;
2375
2376                 break;
2377
2378         case PN533_DEVICE_PASORI:
2379                 max_retries.mx_rty_atr = 0x2;
2380                 max_retries.mx_rty_psl = 0x1;
2381                 max_retries.mx_rty_passive_act =
2382                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2383
2384                 timing.rfu = PN533_CONFIG_TIMING_102;
2385                 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2386                 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2387
2388                 break;
2389
2390         default:
2391                 nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2392                             dev->device_type);
2393                 return -EINVAL;
2394         }
2395
2396         rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2397                                      (u8 *)&max_retries, sizeof(max_retries));
2398         if (rc) {
2399                 nfc_dev_err(&dev->interface->dev,
2400                             "Error on setting MAX_RETRIES config");
2401                 return rc;
2402         }
2403
2404
2405         rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2406                                      (u8 *)&timing, sizeof(timing));
2407         if (rc) {
2408                 nfc_dev_err(&dev->interface->dev,
2409                             "Error on setting RF timings");
2410                 return rc;
2411         }
2412
2413         switch (dev->device_type) {
2414         case PN533_DEVICE_STD:
2415                 break;
2416
2417         case PN533_DEVICE_PASORI:
2418                 pn533_pasori_fw_reset(dev);
2419
2420                 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2421                                              pasori_cfg, 3);
2422                 if (rc) {
2423                         nfc_dev_err(&dev->interface->dev,
2424                                     "Error while settings PASORI config");
2425                         return rc;
2426                 }
2427
2428                 pn533_pasori_fw_reset(dev);
2429
2430                 break;
2431         }
2432
2433         return 0;
2434 }
2435
2436 static int pn533_probe(struct usb_interface *interface,
2437                         const struct usb_device_id *id)
2438 {
2439         struct pn533_fw_version fw_ver;
2440         struct pn533 *dev;
2441         struct usb_host_interface *iface_desc;
2442         struct usb_endpoint_descriptor *endpoint;
2443         int in_endpoint = 0;
2444         int out_endpoint = 0;
2445         int rc = -ENOMEM;
2446         int i;
2447         u32 protocols;
2448
2449         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2450         if (!dev)
2451                 return -ENOMEM;
2452
2453         dev->udev = usb_get_dev(interface_to_usbdev(interface));
2454         dev->interface = interface;
2455         mutex_init(&dev->cmd_lock);
2456
2457         iface_desc = interface->cur_altsetting;
2458         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
2459                 endpoint = &iface_desc->endpoint[i].desc;
2460
2461                 if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
2462                         in_endpoint = endpoint->bEndpointAddress;
2463
2464                 if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
2465                         out_endpoint = endpoint->bEndpointAddress;
2466         }
2467
2468         if (!in_endpoint || !out_endpoint) {
2469                 nfc_dev_err(&interface->dev,
2470                             "Could not find bulk-in or bulk-out endpoint");
2471                 rc = -ENODEV;
2472                 goto error;
2473         }
2474
2475         dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
2476         dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
2477
2478         if (!dev->in_urb || !dev->out_urb)
2479                 goto error;
2480
2481         usb_fill_bulk_urb(dev->in_urb, dev->udev,
2482                           usb_rcvbulkpipe(dev->udev, in_endpoint),
2483                           NULL, 0, NULL, dev);
2484         usb_fill_bulk_urb(dev->out_urb, dev->udev,
2485                           usb_sndbulkpipe(dev->udev, out_endpoint),
2486                           NULL, 0, pn533_send_complete, dev);
2487
2488         INIT_WORK(&dev->cmd_work, pn533_wq_cmd);
2489         INIT_WORK(&dev->cmd_complete_work, pn533_wq_cmd_complete);
2490         INIT_WORK(&dev->mi_work, pn533_wq_mi_recv);
2491         INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
2492         INIT_WORK(&dev->poll_work, pn533_wq_poll);
2493         dev->wq = alloc_ordered_workqueue("pn533", 0);
2494         if (dev->wq == NULL)
2495                 goto error;
2496
2497         init_timer(&dev->listen_timer);
2498         dev->listen_timer.data = (unsigned long) dev;
2499         dev->listen_timer.function = pn533_listen_mode_timer;
2500
2501         skb_queue_head_init(&dev->resp_q);
2502
2503         INIT_LIST_HEAD(&dev->cmd_queue);
2504
2505         usb_set_intfdata(interface, dev);
2506
2507         dev->ops = &pn533_std_frame_ops;
2508
2509         dev->device_type = id->driver_info;
2510         switch (dev->device_type) {
2511         case PN533_DEVICE_STD:
2512                 protocols = PN533_ALL_PROTOCOLS;
2513                 break;
2514
2515         case PN533_DEVICE_PASORI:
2516                 protocols = PN533_NO_TYPE_B_PROTOCOLS;
2517                 break;
2518
2519         default:
2520                 nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2521                             dev->device_type);
2522                 rc = -EINVAL;
2523                 goto destroy_wq;
2524         }
2525
2526         memset(&fw_ver, 0, sizeof(fw_ver));
2527         rc = pn533_get_firmware_version(dev, &fw_ver);
2528         if (rc < 0)
2529                 goto destroy_wq;
2530
2531         nfc_dev_info(&dev->interface->dev,
2532                      "NXP PN533 firmware ver %d.%d now attached",
2533                      fw_ver.ver, fw_ver.rev);
2534
2535
2536         dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2537                                            NFC_SE_NONE,
2538                                            dev->ops->tx_header_len +
2539                                            PN533_CMD_DATAEXCH_HEAD_LEN,
2540                                            dev->ops->tx_tail_len);
2541         if (!dev->nfc_dev)
2542                 goto destroy_wq;
2543
2544         nfc_set_parent_dev(dev->nfc_dev, &interface->dev);
2545         nfc_set_drvdata(dev->nfc_dev, dev);
2546
2547         rc = nfc_register_device(dev->nfc_dev);
2548         if (rc)
2549                 goto free_nfc_dev;
2550
2551         rc = pn533_setup(dev);
2552         if (rc)
2553                 goto unregister_nfc_dev;
2554
2555         return 0;
2556
2557 unregister_nfc_dev:
2558         nfc_unregister_device(dev->nfc_dev);
2559
2560 free_nfc_dev:
2561         nfc_free_device(dev->nfc_dev);
2562
2563 destroy_wq:
2564         destroy_workqueue(dev->wq);
2565 error:
2566         usb_free_urb(dev->in_urb);
2567         usb_free_urb(dev->out_urb);
2568         kfree(dev);
2569         return rc;
2570 }
2571
2572 static void pn533_disconnect(struct usb_interface *interface)
2573 {
2574         struct pn533 *dev;
2575         struct pn533_cmd *cmd, *n;
2576
2577         dev = usb_get_intfdata(interface);
2578         usb_set_intfdata(interface, NULL);
2579
2580         nfc_unregister_device(dev->nfc_dev);
2581         nfc_free_device(dev->nfc_dev);
2582
2583         usb_kill_urb(dev->in_urb);
2584         usb_kill_urb(dev->out_urb);
2585
2586         destroy_workqueue(dev->wq);
2587
2588         skb_queue_purge(&dev->resp_q);
2589
2590         del_timer(&dev->listen_timer);
2591
2592         list_for_each_entry_safe(cmd, n, &dev->cmd_queue, queue) {
2593                 list_del(&cmd->queue);
2594                 kfree(cmd);
2595         }
2596
2597         usb_free_urb(dev->in_urb);
2598         usb_free_urb(dev->out_urb);
2599         kfree(dev);
2600
2601         nfc_dev_info(&interface->dev, "NXP PN533 NFC device disconnected");
2602 }
2603
2604 static struct usb_driver pn533_driver = {
2605         .name =         "pn533",
2606         .probe =        pn533_probe,
2607         .disconnect =   pn533_disconnect,
2608         .id_table =     pn533_table,
2609 };
2610
2611 module_usb_driver(pn533_driver);
2612
2613 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
2614 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2615 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
2616 MODULE_DESCRIPTION("PN533 usb driver ver " VERSION);
2617 MODULE_VERSION(VERSION);
2618 MODULE_LICENSE("GPL");