drivers/nfc/pn533.c

   1 /*
   2  * Copyright (C) 2011 Instituto Nokia de Tecnologia
   3  *
   4  * Authors:
   5  *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
   6  *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the
  20  * Free Software Foundation, Inc.,
  21  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23
  24 #include <linux/device.h>
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/slab.h>
  28 #include <linux/usb.h>
  29 #include <linux/nfc.h>
  30 #include <linux/netdevice.h>
  31 #include <net/nfc/nfc.h>
  32
  33 #define VERSION "0.1"
  34
  35 #define PN533_VENDOR_ID 0x4CC
  36 #define PN533_PRODUCT_ID 0x2533
  37
  38 #define SCM_VENDOR_ID 0x4E6
  39 #define SCL3711_PRODUCT_ID 0x5591
  40
  41 #define SONY_VENDOR_ID         0x054c
  42 #define PASORI_PRODUCT_ID      0x02e1
  43
  44 #define PN533_DEVICE_STD    0x1
  45 #define PN533_DEVICE_PASORI 0x2
  46
  47 #define PN533_ALL_PROTOCOLS (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK |\
  48                              NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK |\
  49                              NFC_PROTO_NFC_DEP_MASK |\
  50                              NFC_PROTO_ISO14443_B_MASK)
  51
  52 #define PN533_NO_TYPE_B_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
  53                                    NFC_PROTO_MIFARE_MASK | \
  54                                    NFC_PROTO_FELICA_MASK | \
  55                                    NFC_PROTO_ISO14443_MASK | \
  56                                    NFC_PROTO_NFC_DEP_MASK)
  57
  58 static const struct usb_device_id pn533_table[] = {
  59         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE,
  60           .idVendor             = PN533_VENDOR_ID,
  61           .idProduct            = PN533_PRODUCT_ID,
  62           .driver_info          = PN533_DEVICE_STD,
  63         },
  64         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE,
  65           .idVendor             = SCM_VENDOR_ID,
  66           .idProduct            = SCL3711_PRODUCT_ID,
  67           .driver_info          = PN533_DEVICE_STD,
  68         },
  69         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE,
  70           .idVendor             = SONY_VENDOR_ID,
  71           .idProduct            = PASORI_PRODUCT_ID,
  72           .driver_info          = PN533_DEVICE_PASORI,
  73         },
  74         { }
  75 };
  76 MODULE_DEVICE_TABLE(usb, pn533_table);
  77
  78 /* How much time we spend listening for initiators */
  79 #define PN533_LISTEN_TIME 2
  80
  81 /* frame definitions */
  82 #define PN533_FRAME_HEADER_LEN (sizeof(struct pn533_frame) \
  83                                         + 2) /* data[0] TFI, data[1] CC */
  84 #define PN533_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
  85
  86 /*
  87  * Max extended frame payload len, excluding TFI and CC
  88  * which are already in PN533_FRAME_HEADER_LEN.
  89  */
  90 #define PN533_FRAME_MAX_PAYLOAD_LEN 263
  91
  92 #define PN533_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2),
  93                                   Postamble (1) */
  94 #define PN533_FRAME_CHECKSUM(f) (f->data[f->datalen])
  95 #define PN533_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])
  96
  97 /* start of frame */
  98 #define PN533_SOF 0x00FF
  99
 100 /* frame identifier: in/out/error */
 101 #define PN533_FRAME_IDENTIFIER(f) (f->data[0])
 102 #define PN533_DIR_OUT 0xD4
 103 #define PN533_DIR_IN 0xD5
 104
 105 /* PN533 Commands */
 106 #define PN533_FRAME_CMD(f) (f->data[1])
 107
 108 #define PN533_CMD_GET_FIRMWARE_VERSION 0x02
 109 #define PN533_CMD_RF_CONFIGURATION 0x32
 110 #define PN533_CMD_IN_DATA_EXCHANGE 0x40
 111 #define PN533_CMD_IN_COMM_THRU     0x42
 112 #define PN533_CMD_IN_LIST_PASSIVE_TARGET 0x4A
 113 #define PN533_CMD_IN_ATR 0x50
 114 #define PN533_CMD_IN_RELEASE 0x52
 115 #define PN533_CMD_IN_JUMP_FOR_DEP 0x56
 116
 117 #define PN533_CMD_TG_INIT_AS_TARGET 0x8c
 118 #define PN533_CMD_TG_GET_DATA 0x86
 119 #define PN533_CMD_TG_SET_DATA 0x8e
 120 #define PN533_CMD_UNDEF 0xff
 121
 122 #define PN533_CMD_RESPONSE(cmd) (cmd + 1)
 123
 124 /* PN533 Return codes */
 125 #define PN533_CMD_RET_MASK 0x3F
 126 #define PN533_CMD_MI_MASK 0x40
 127 #define PN533_CMD_RET_SUCCESS 0x00
 128
 129 struct pn533;
 130
 131 typedef int (*pn533_cmd_complete_t) (struct pn533 *dev, void *arg, int status);
 132
 133 typedef int (*pn533_send_async_complete_t) (struct pn533 *dev, void *arg,
 134                                         struct sk_buff *resp);
 135
 136 /* structs for pn533 commands */
 137
 138 /* PN533_CMD_GET_FIRMWARE_VERSION */
 139 struct pn533_fw_version {
 140         u8 ic;
 141         u8 ver;
 142         u8 rev;
 143         u8 support;
 144 };
 145
 146 /* PN533_CMD_RF_CONFIGURATION */
 147 #define PN533_CFGITEM_TIMING 0x02
 148 #define PN533_CFGITEM_MAX_RETRIES 0x05
 149 #define PN533_CFGITEM_PASORI 0x82
 150
 151 #define PN533_CONFIG_TIMING_102 0xb
 152 #define PN533_CONFIG_TIMING_204 0xc
 153 #define PN533_CONFIG_TIMING_409 0xd
 154 #define PN533_CONFIG_TIMING_819 0xe
 155
 156 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
 157 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
 158
 159 struct pn533_config_max_retries {
 160         u8 mx_rty_atr;
 161         u8 mx_rty_psl;
 162         u8 mx_rty_passive_act;
 163 } __packed;
 164
 165 struct pn533_config_timing {
 166         u8 rfu;
 167         u8 atr_res_timeout;
 168         u8 dep_timeout;
 169 } __packed;
 170
 171 /* PN533_CMD_IN_LIST_PASSIVE_TARGET */
 172
 173 /* felica commands opcode */
 174 #define PN533_FELICA_OPC_SENSF_REQ 0
 175 #define PN533_FELICA_OPC_SENSF_RES 1
 176 /* felica SENSF_REQ parameters */
 177 #define PN533_FELICA_SENSF_SC_ALL 0xFFFF
 178 #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
 179 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
 180 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
 181
 182 /* type B initiator_data values */
 183 #define PN533_TYPE_B_AFI_ALL_FAMILIES 0
 184 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
 185 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
 186
 187 union pn533_cmd_poll_initdata {
 188         struct {
 189                 u8 afi;
 190                 u8 polling_method;
 191         } __packed type_b;
 192         struct {
 193                 u8 opcode;
 194                 __be16 sc;
 195                 u8 rc;
 196                 u8 tsn;
 197         } __packed felica;
 198 };
 199
 200 /* Poll modulations */
 201 enum {
 202         PN533_POLL_MOD_106KBPS_A,
 203         PN533_POLL_MOD_212KBPS_FELICA,
 204         PN533_POLL_MOD_424KBPS_FELICA,
 205         PN533_POLL_MOD_106KBPS_JEWEL,
 206         PN533_POLL_MOD_847KBPS_B,
 207         PN533_LISTEN_MOD,
 208
 209         __PN533_POLL_MOD_AFTER_LAST,
 210 };
 211 #define PN533_POLL_MOD_MAX (__PN533_POLL_MOD_AFTER_LAST - 1)
 212
 213 struct pn533_poll_modulations {
 214         struct {
 215                 u8 maxtg;
 216                 u8 brty;
 217                 union pn533_cmd_poll_initdata initiator_data;
 218         } __packed data;
 219         u8 len;
 220 };
 221
 222 const struct pn533_poll_modulations poll_mod[] = {
 223         [PN533_POLL_MOD_106KBPS_A] = {
 224                 .data = {
 225                         .maxtg = 1,
 226                         .brty = 0,
 227                 },
 228                 .len = 2,
 229         },
 230         [PN533_POLL_MOD_212KBPS_FELICA] = {
 231                 .data = {
 232                         .maxtg = 1,
 233                         .brty = 1,
 234                         .initiator_data.felica = {
 235                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
 236                                 .sc = PN533_FELICA_SENSF_SC_ALL,
 237                                 .rc = PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE,
 238                                 .tsn = 0,
 239                         },
 240                 },
 241                 .len = 7,
 242         },
 243         [PN533_POLL_MOD_424KBPS_FELICA] = {
 244                 .data = {
 245                         .maxtg = 1,
 246                         .brty = 2,
 247                         .initiator_data.felica = {
 248                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
 249                                 .sc = PN533_FELICA_SENSF_SC_ALL,
 250                                 .rc = PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE,
 251                                 .tsn = 0,
 252                         },
 253                  },
 254                 .len = 7,
 255         },
 256         [PN533_POLL_MOD_106KBPS_JEWEL] = {
 257                 .data = {
 258                         .maxtg = 1,
 259                         .brty = 4,
 260                 },
 261                 .len = 2,
 262         },
 263         [PN533_POLL_MOD_847KBPS_B] = {
 264                 .data = {
 265                         .maxtg = 1,
 266                         .brty = 8,
 267                         .initiator_data.type_b = {
 268                                 .afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
 269                                 .polling_method =
 270                                         PN533_TYPE_B_POLL_METHOD_TIMESLOT,
 271                         },
 272                 },
 273                 .len = 3,
 274         },
 275         [PN533_LISTEN_MOD] = {
 276                 .len = 0,
 277         },
 278 };
 279
 280 /* PN533_CMD_IN_ATR */
 281
 282 struct pn533_cmd_activate_response {
 283         u8 status;
 284         u8 nfcid3t[10];
 285         u8 didt;
 286         u8 bst;
 287         u8 brt;
 288         u8 to;
 289         u8 ppt;
 290         /* optional */
 291         u8 gt[];
 292 } __packed;
 293
 294 struct pn533_cmd_jump_dep_response {
 295         u8 status;
 296         u8 tg;
 297         u8 nfcid3t[10];
 298         u8 didt;
 299         u8 bst;
 300         u8 brt;
 301         u8 to;
 302         u8 ppt;
 303         /* optional */
 304         u8 gt[];
 305 } __packed;
 306
 307
 308 /* PN533_TG_INIT_AS_TARGET */
 309 #define PN533_INIT_TARGET_PASSIVE 0x1
 310 #define PN533_INIT_TARGET_DEP 0x2
 311
 312 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
 313 #define PN533_INIT_TARGET_RESP_ACTIVE     0x1
 314 #define PN533_INIT_TARGET_RESP_DEP        0x4
 315
 316 struct pn533 {
 317         struct usb_device *udev;
 318         struct usb_interface *interface;
 319         struct nfc_dev *nfc_dev;
 320
 321         struct urb *out_urb;
 322         struct urb *in_urb;
 323
 324         struct sk_buff_head resp_q;
 325
 326         struct workqueue_struct *wq;
 327         struct work_struct cmd_work;
 328         struct work_struct cmd_complete_work;
 329         struct work_struct poll_work;
 330         struct work_struct mi_work;
 331         struct work_struct tg_work;
 332         struct timer_list listen_timer;
 333         int wq_in_error;
 334         int cancel_listen;
 335
 336         pn533_cmd_complete_t cmd_complete;
 337         void *cmd_complete_arg;
 338         void *cmd_complete_mi_arg;
 339         struct mutex cmd_lock;
 340         u8 cmd;
 341
 342         struct pn533_poll_modulations *poll_mod_active[PN533_POLL_MOD_MAX + 1];
 343         u8 poll_mod_count;
 344         u8 poll_mod_curr;
 345         u32 poll_protocols;
 346         u32 listen_protocols;
 347
 348         u8 *gb;
 349         size_t gb_len;
 350
 351         u8 tgt_available_prots;
 352         u8 tgt_active_prot;
 353         u8 tgt_mode;
 354
 355         u32 device_type;
 356
 357         struct list_head cmd_queue;
 358         u8 cmd_pending;
 359
 360         struct pn533_frame_ops *ops;
 361 };
 362
 363 struct pn533_cmd {
 364         struct list_head queue;
 365         u8 cmd_code;
 366         struct sk_buff *req;
 367         struct sk_buff *resp;
 368         int resp_len;
 369         void *arg;
 370 };
 371
 372 struct pn533_frame {
 373         u8 preamble;
 374         __be16 start_frame;
 375         u8 datalen;
 376         u8 datalen_checksum;
 377         u8 data[];
 378 } __packed;
 379
 380 struct pn533_frame_ops {
 381         void (*tx_frame_init)(void *frame, u8 cmd_code);
 382         void (*tx_frame_finish)(void *frame);
 383         void (*tx_update_payload_len)(void *frame, int len);
 384         int tx_header_len;
 385         int tx_tail_len;
 386
 387         bool (*rx_is_frame_valid)(void *frame);
 388         int (*rx_frame_size)(void *frame);
 389         int rx_header_len;
 390         int rx_tail_len;
 391
 392         int max_payload_len;
 393         u8 (*get_cmd_code)(void *frame);
 394 };
 395
 396 /* The rule: value + checksum = 0 */
 397 static inline u8 pn533_checksum(u8 value)
 398 {
 399         return ~value + 1;
 400 }
 401
 402 /* The rule: sum(data elements) + checksum = 0 */
 403 static u8 pn533_data_checksum(u8 *data, int datalen)
 404 {
 405         u8 sum = 0;
 406         int i;
 407
 408         for (i = 0; i < datalen; i++)
 409                 sum += data[i];
 410
 411         return pn533_checksum(sum);
 412 }
 413
 414 static void pn533_tx_frame_init(void *_frame, u8 cmd_code)
 415 {
 416         struct pn533_frame *frame = _frame;
 417
 418         frame->preamble = 0;
 419         frame->start_frame = cpu_to_be16(PN533_SOF);
 420         PN533_FRAME_IDENTIFIER(frame) = PN533_DIR_OUT;
 421         PN533_FRAME_CMD(frame) = cmd_code;
 422         frame->datalen = 2;
 423 }
 424
 425 static void pn533_tx_frame_finish(void *_frame)
 426 {
 427         struct pn533_frame *frame = _frame;
 428
 429         frame->datalen_checksum = pn533_checksum(frame->datalen);
 430
 431         PN533_FRAME_CHECKSUM(frame) =
 432                 pn533_data_checksum(frame->data, frame->datalen);
 433
 434         PN533_FRAME_POSTAMBLE(frame) = 0;
 435 }
 436
 437 static void pn533_tx_update_payload_len(void *_frame, int len)
 438 {
 439         struct pn533_frame *frame = _frame;
 440
 441         frame->datalen += len;
 442 }
 443
 444 static bool pn533_rx_frame_is_valid(void *_frame)
 445 {
 446         u8 checksum;
 447         struct pn533_frame *frame = _frame;
 448
 449         if (frame->start_frame != cpu_to_be16(PN533_SOF))
 450                 return false;
 451
 452         checksum = pn533_checksum(frame->datalen);
 453         if (checksum != frame->datalen_checksum)
 454                 return false;
 455
 456         checksum = pn533_data_checksum(frame->data, frame->datalen);
 457         if (checksum != PN533_FRAME_CHECKSUM(frame))
 458                 return false;
 459
 460         return true;
 461 }
 462
 463 static bool pn533_rx_frame_is_ack(struct pn533_frame *frame)
 464 {
 465         if (frame->start_frame != cpu_to_be16(PN533_SOF))
 466                 return false;
 467
 468         if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
 469                 return false;
 470
 471         return true;
 472 }
 473
 474 static inline int pn533_rx_frame_size(void *frame)
 475 {
 476         struct pn533_frame *f = frame;
 477
 478         return sizeof(struct pn533_frame) + f->datalen + PN533_FRAME_TAIL_LEN;
 479 }
 480
 481 static u8 pn533_get_cmd_code(void *frame)
 482 {
 483         struct pn533_frame *f = frame;
 484
 485         return PN533_FRAME_CMD(f);
 486 }
 487
 488 struct pn533_frame_ops pn533_std_frame_ops = {
 489         .tx_frame_init = pn533_tx_frame_init,
 490         .tx_frame_finish = pn533_tx_frame_finish,
 491         .tx_update_payload_len = pn533_tx_update_payload_len,
 492         .tx_header_len = PN533_FRAME_HEADER_LEN,
 493         .tx_tail_len = PN533_FRAME_TAIL_LEN,
 494
 495         .rx_is_frame_valid = pn533_rx_frame_is_valid,
 496         .rx_frame_size = pn533_rx_frame_size,
 497         .rx_header_len = PN533_FRAME_HEADER_LEN,
 498         .rx_tail_len = PN533_FRAME_TAIL_LEN,
 499
 500         .max_payload_len =  PN533_FRAME_MAX_PAYLOAD_LEN,
 501         .get_cmd_code = pn533_get_cmd_code,
 502 };
 503
 504 static bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
 505 {
 506         return (dev->ops->get_cmd_code(frame) == PN533_CMD_RESPONSE(dev->cmd));
 507 }
 508
 509
 510 static void pn533_wq_cmd_complete(struct work_struct *work)
 511 {
 512         struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
 513         int rc;
 514
 515         rc = dev->cmd_complete(dev, dev->cmd_complete_arg, dev->wq_in_error);
 516         if (rc != -EINPROGRESS)
 517                 queue_work(dev->wq, &dev->cmd_work);
 518 }
 519
 520 static void pn533_recv_response(struct urb *urb)
 521 {
 522         struct pn533 *dev = urb->context;
 523         u8 *in_frame;
 524
 525         switch (urb->status) {
 526         case 0:
 527                 break; /* success */
 528         case -ECONNRESET:
 529         case -ENOENT:
 530                 nfc_dev_dbg(&dev->interface->dev,
 531                             "The urb has been canceled (status %d)",
 532                             urb->status);
 533                 dev->wq_in_error = urb->status;
 534                 goto sched_wq;
 535                 break;
 536         case -ESHUTDOWN:
 537         default:
 538                 nfc_dev_err(&dev->interface->dev,
 539                             "Urb failure (status %d)", urb->status);
 540                 dev->wq_in_error = urb->status;
 541                 goto sched_wq;
 542         }
 543
 544         in_frame = dev->in_urb->transfer_buffer;
 545
 546         nfc_dev_dbg(&dev->interface->dev, "Received a frame.");
 547         print_hex_dump(KERN_DEBUG, "PN533 RX: ", DUMP_PREFIX_NONE, 16, 1,
 548                        in_frame, dev->ops->rx_frame_size(in_frame), false);
 549
 550         if (!dev->ops->rx_is_frame_valid(in_frame)) {
 551                 nfc_dev_err(&dev->interface->dev, "Received an invalid frame");
 552                 dev->wq_in_error = -EIO;
 553                 goto sched_wq;
 554         }
 555
 556         if (!pn533_rx_frame_is_cmd_response(dev, in_frame)) {
 557                 nfc_dev_err(&dev->interface->dev,
 558                             "It it not the response to the last command");
 559                 dev->wq_in_error = -EIO;
 560                 goto sched_wq;
 561         }
 562
 563         dev->wq_in_error = 0;
 564
 565 sched_wq:
 566         queue_work(dev->wq, &dev->cmd_complete_work);
 567 }
 568
 569 static int pn533_submit_urb_for_response(struct pn533 *dev, gfp_t flags)
 570 {
 571         dev->in_urb->complete = pn533_recv_response;
 572
 573         return usb_submit_urb(dev->in_urb, flags);
 574 }
 575
 576 static void pn533_recv_ack(struct urb *urb)
 577 {
 578         struct pn533 *dev = urb->context;
 579         struct pn533_frame *in_frame;
 580         int rc;
 581
 582         switch (urb->status) {
 583         case 0:
 584                 break; /* success */
 585         case -ECONNRESET:
 586         case -ENOENT:
 587                 nfc_dev_dbg(&dev->interface->dev,
 588                             "The urb has been stopped (status %d)",
 589                             urb->status);
 590                 dev->wq_in_error = urb->status;
 591                 goto sched_wq;
 592                 break;
 593         case -ESHUTDOWN:
 594         default:
 595                 nfc_dev_err(&dev->interface->dev,
 596                             "Urb failure (status %d)", urb->status);
 597                 dev->wq_in_error = urb->status;
 598                 goto sched_wq;
 599         }
 600
 601         in_frame = dev->in_urb->transfer_buffer;
 602
 603         if (!pn533_rx_frame_is_ack(in_frame)) {
 604                 nfc_dev_err(&dev->interface->dev, "Received an invalid ack");
 605                 dev->wq_in_error = -EIO;
 606                 goto sched_wq;
 607         }
 608
 609         rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
 610         if (rc) {
 611                 nfc_dev_err(&dev->interface->dev,
 612                             "usb_submit_urb failed with result %d", rc);
 613                 dev->wq_in_error = rc;
 614                 goto sched_wq;
 615         }
 616
 617         return;
 618
 619 sched_wq:
 620         queue_work(dev->wq, &dev->cmd_complete_work);
 621 }
 622
 623 static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags)
 624 {
 625         dev->in_urb->complete = pn533_recv_ack;
 626
 627         return usb_submit_urb(dev->in_urb, flags);
 628 }
 629
 630 static int pn533_send_ack(struct pn533 *dev, gfp_t flags)
 631 {
 632         u8 ack[PN533_FRAME_ACK_SIZE] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
 633         /* spec 7.1.1.3:  Preamble, SoPC (2), ACK Code (2), Postamble */
 634         int rc;
 635
 636         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
 637
 638         dev->out_urb->transfer_buffer = ack;
 639         dev->out_urb->transfer_buffer_length = sizeof(ack);
 640         rc = usb_submit_urb(dev->out_urb, flags);
 641
 642         return rc;
 643 }
 644
 645 static int __pn533_send_frame_async(struct pn533 *dev,
 646                                         struct sk_buff *out,
 647                                         struct sk_buff *in,
 648                                         int in_len,
 649                                         pn533_cmd_complete_t cmd_complete,
 650                                         void *arg)
 651 {
 652         int rc;
 653
 654         dev->cmd = dev->ops->get_cmd_code(out->data);
 655         dev->cmd_complete = cmd_complete;
 656         dev->cmd_complete_arg = arg;
 657
 658         dev->out_urb->transfer_buffer = out->data;
 659         dev->out_urb->transfer_buffer_length = out->len;
 660
 661         dev->in_urb->transfer_buffer = in->data;
 662         dev->in_urb->transfer_buffer_length = in_len;
 663
 664         print_hex_dump(KERN_DEBUG, "PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
 665                        out->data, out->len, false);
 666
 667         rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
 668         if (rc)
 669                 return rc;
 670
 671         rc = pn533_submit_urb_for_ack(dev, GFP_KERNEL);
 672         if (rc)
 673                 goto error;
 674
 675         return 0;
 676
 677 error:
 678         usb_unlink_urb(dev->out_urb);
 679         return rc;
 680 }
 681
 682 static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
 683                                   struct sk_buff *skb)
 684 {
 685         /* payload is already there, just update datalen */
 686         int payload_len = skb->len;
 687         struct pn533_frame_ops *ops = dev->ops;
 688
 689
 690         skb_push(skb, ops->tx_header_len);
 691         skb_put(skb, ops->tx_tail_len);
 692
 693         ops->tx_frame_init(skb->data, cmd_code);
 694         ops->tx_update_payload_len(skb->data, payload_len);
 695         ops->tx_frame_finish(skb->data);
 696 }
 697
 698 struct pn533_send_async_complete_arg {
 699         pn533_send_async_complete_t  complete_cb;
 700         void *complete_cb_context;
 701         struct sk_buff *resp;
 702         struct sk_buff *req;
 703 };
 704
 705 static int pn533_send_async_complete(struct pn533 *dev, void *_arg, int status)
 706 {
 707         struct pn533_send_async_complete_arg *arg = _arg;
 708
 709         struct sk_buff *req = arg->req;
 710         struct sk_buff *resp = arg->resp;
 711
 712         int rc;
 713
 714         dev_kfree_skb(req);
 715
 716         if (status < 0) {
 717                 arg->complete_cb(dev, arg->complete_cb_context,
 718                                  ERR_PTR(status));
 719                 dev_kfree_skb(resp);
 720                 kfree(arg);
 721                 return status;
 722         }
 723
 724         skb_put(resp, dev->ops->rx_frame_size(resp->data));
 725         skb_pull(resp, dev->ops->rx_header_len);
 726         skb_trim(resp, resp->len - dev->ops->rx_tail_len);
 727
 728         rc = arg->complete_cb(dev, arg->complete_cb_context, resp);
 729
 730         kfree(arg);
 731         return rc;
 732 }
 733
 734 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
 735                               struct sk_buff *req, struct sk_buff *resp,
 736                               int resp_len,
 737                               pn533_send_async_complete_t complete_cb,
 738                               void *complete_cb_context)
 739 {
 740         struct pn533_cmd *cmd;
 741         struct pn533_send_async_complete_arg *arg;
 742         int rc = 0;
 743
 744         nfc_dev_dbg(&dev->interface->dev, "Sending command 0x%x", cmd_code);
 745
 746         arg = kzalloc(sizeof(*arg), GFP_KERNEL);
 747         if (!arg)
 748                 return -ENOMEM;
 749
 750         arg->complete_cb = complete_cb;
 751         arg->complete_cb_context = complete_cb_context;
 752         arg->resp = resp;
 753         arg->req = req;
 754
 755         pn533_build_cmd_frame(dev, cmd_code, req);
 756
 757         mutex_lock(&dev->cmd_lock);
 758
 759         if (!dev->cmd_pending) {
 760                 rc = __pn533_send_frame_async(dev, req, resp, resp_len,
 761                                               pn533_send_async_complete, arg);
 762                 if (rc)
 763                         goto error;
 764
 765                 dev->cmd_pending = 1;
 766                 goto unlock;
 767         }
 768
 769         nfc_dev_dbg(&dev->interface->dev, "%s Queueing command 0x%x", __func__,
 770                     cmd_code);
 771
 772         cmd = kzalloc(sizeof(struct pn533_cmd), GFP_KERNEL);
 773         if (!cmd) {
 774                 rc = -ENOMEM;
 775                 goto error;
 776         }
 777
 778         INIT_LIST_HEAD(&cmd->queue);
 779         cmd->cmd_code = cmd_code;
 780         cmd->req = req;
 781         cmd->resp = resp;
 782         cmd->resp_len = resp_len;
 783         cmd->arg = arg;
 784
 785         list_add_tail(&cmd->queue, &dev->cmd_queue);
 786
 787         goto unlock;
 788
 789 error:
 790         kfree(arg);
 791 unlock:
 792         mutex_unlock(&dev->cmd_lock);
 793         return rc;
 794 }
 795
 796 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
 797                                  struct sk_buff *req,
 798                                  pn533_send_async_complete_t complete_cb,
 799                                  void *complete_cb_context)
 800 {
 801         struct sk_buff *resp;
 802         int rc;
 803         int  resp_len = dev->ops->rx_header_len +
 804                         dev->ops->max_payload_len +
 805                         dev->ops->rx_tail_len;
 806
 807         resp = nfc_alloc_recv_skb(resp_len, GFP_KERNEL);
 808         if (!resp)
 809                 return -ENOMEM;
 810
 811         rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
 812                                 complete_cb_context);
 813         if (rc)
 814                 dev_kfree_skb(resp);
 815
 816         return rc;
 817 }
 818
 819 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
 820                                 struct sk_buff *req,
 821                                 pn533_send_async_complete_t complete_cb,
 822                                 void *complete_cb_context)
 823 {
 824         struct sk_buff *resp;
 825         int rc;
 826         int  resp_len = dev->ops->rx_header_len +
 827                         dev->ops->max_payload_len +
 828                         dev->ops->rx_tail_len;
 829
 830         resp = alloc_skb(resp_len, GFP_KERNEL);
 831         if (!resp)
 832                 return -ENOMEM;
 833
 834         rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
 835                                 complete_cb_context);
 836         if (rc)
 837                 dev_kfree_skb(resp);
 838
 839         return rc;
 840 }
 841
 842 /*
 843  * pn533_send_cmd_direct_async
 844  *
 845  * The function sends a piority cmd directly to the chip omiting the cmd
 846  * queue. It's intended to be used by chaining mechanism of received responses
 847  * where the host has to request every single chunk of data before scheduling
 848  * next cmd from the queue.
 849  */
 850 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
 851                                        struct sk_buff *req,
 852                                        pn533_send_async_complete_t complete_cb,
 853                                        void *complete_cb_context)
 854 {
 855         struct pn533_send_async_complete_arg *arg;
 856         struct sk_buff *resp;
 857         int rc;
 858         int resp_len = dev->ops->rx_header_len +
 859                        dev->ops->max_payload_len +
 860                        dev->ops->rx_tail_len;
 861
 862         resp = alloc_skb(resp_len, GFP_KERNEL);
 863         if (!resp)
 864                 return -ENOMEM;
 865
 866         arg = kzalloc(sizeof(*arg), GFP_KERNEL);
 867         if (!arg) {
 868                 dev_kfree_skb(resp);
 869                 return -ENOMEM;
 870         }
 871
 872         arg->complete_cb = complete_cb;
 873         arg->complete_cb_context = complete_cb_context;
 874         arg->resp = resp;
 875         arg->req = req;
 876
 877         pn533_build_cmd_frame(dev, cmd_code, req);
 878
 879         rc = __pn533_send_frame_async(dev, req, resp, resp_len,
 880                                       pn533_send_async_complete, arg);
 881         if (rc < 0) {
 882                 dev_kfree_skb(resp);
 883                 kfree(arg);
 884         }
 885
 886         return rc;
 887 }
 888
 889 static void pn533_wq_cmd(struct work_struct *work)
 890 {
 891         struct pn533 *dev = container_of(work, struct pn533, cmd_work);
 892         struct pn533_cmd *cmd;
 893
 894         mutex_lock(&dev->cmd_lock);
 895
 896         if (list_empty(&dev->cmd_queue)) {
 897                 dev->cmd_pending = 0;
 898                 mutex_unlock(&dev->cmd_lock);
 899                 return;
 900         }
 901
 902         cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
 903
 904         list_del(&cmd->queue);
 905
 906         mutex_unlock(&dev->cmd_lock);
 907
 908         __pn533_send_frame_async(dev, cmd->req, cmd->resp, cmd->resp_len,
 909                                  pn533_send_async_complete, cmd->arg);
 910
 911         kfree(cmd);
 912 }
 913
 914 struct pn533_sync_cmd_response {
 915         struct sk_buff *resp;
 916         struct completion done;
 917 };
 918
 919 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
 920                                     struct sk_buff *resp)
 921 {
 922         struct pn533_sync_cmd_response *arg = _arg;
 923
 924         arg->resp = resp;
 925         complete(&arg->done);
 926
 927         return 0;
 928 }
 929
 930 /*  pn533_send_cmd_sync
 931  *
 932  *  Please note the req parameter is freed inside the function to
 933  *  limit a number of return value interpretations by the caller.
 934  *
 935  *  1. negative in case of error during TX path -> req should be freed
 936  *
 937  *  2. negative in case of error during RX path -> req should not be freed
 938  *     as it's been already freed at the begining of RX path by
 939  *     async_complete_cb.
 940  *
 941  *  3. valid pointer in case of succesfult RX path
 942  *
 943  *  A caller has to check a return value with IS_ERR macro. If the test pass,
 944  *  the returned pointer is valid.
 945  *
 946  * */
 947 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
 948                                                struct sk_buff *req)
 949 {
 950         int rc;
 951         struct pn533_sync_cmd_response arg;
 952
 953         init_completion(&arg.done);
 954
 955         rc = pn533_send_cmd_async(dev, cmd_code, req,
 956                                   pn533_send_sync_complete, &arg);
 957         if (rc) {
 958                 dev_kfree_skb(req);
 959                 return ERR_PTR(rc);
 960         }
 961
 962         wait_for_completion(&arg.done);
 963
 964         return arg.resp;
 965 }
 966
 967 static void pn533_send_complete(struct urb *urb)
 968 {
 969         struct pn533 *dev = urb->context;
 970
 971         switch (urb->status) {
 972         case 0:
 973                 break; /* success */
 974         case -ECONNRESET:
 975         case -ENOENT:
 976                 nfc_dev_dbg(&dev->interface->dev,
 977                             "The urb has been stopped (status %d)",
 978                             urb->status);
 979                 break;
 980         case -ESHUTDOWN:
 981         default:
 982                 nfc_dev_err(&dev->interface->dev,
 983                             "Urb failure (status %d)", urb->status);
 984         }
 985 }
 986
 987 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
 988 {
 989         struct sk_buff *skb;
 990
 991         skb = alloc_skb(dev->ops->tx_header_len +
 992                         size +
 993                         dev->ops->tx_tail_len, GFP_KERNEL);
 994
 995         if (skb)
 996                 skb_reserve(skb, dev->ops->tx_header_len);
 997
 998         return skb;
 999 }
1000
1001 struct pn533_target_type_a {
1002         __be16 sens_res;
1003         u8 sel_res;
1004         u8 nfcid_len;
1005         u8 nfcid_data[];
1006 } __packed;
1007
1008
1009 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
1010 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
1011 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
1012
1013 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
1014 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
1015
1016 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
1017 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
1018
1019 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
1020 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
1021 #define PN533_TYPE_A_SEL_PROT_DEP 2
1022 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
1023
1024 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
1025                                                         int target_data_len)
1026 {
1027         u8 ssd;
1028         u8 platconf;
1029
1030         if (target_data_len < sizeof(struct pn533_target_type_a))
1031                 return false;
1032
1033         /* The lenght check of nfcid[] and ats[] are not being performed because
1034            the values are not being used */
1035
1036         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1037         ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
1038         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
1039
1040         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1041              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1042             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1043              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1044                 return false;
1045
1046         /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
1047         if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
1048                 return false;
1049
1050         return true;
1051 }
1052
1053 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
1054                                                         int tgt_data_len)
1055 {
1056         struct pn533_target_type_a *tgt_type_a;
1057
1058         tgt_type_a = (struct pn533_target_type_a *)tgt_data;
1059
1060         if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
1061                 return -EPROTO;
1062
1063         switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
1064         case PN533_TYPE_A_SEL_PROT_MIFARE:
1065                 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
1066                 break;
1067         case PN533_TYPE_A_SEL_PROT_ISO14443:
1068                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
1069                 break;
1070         case PN533_TYPE_A_SEL_PROT_DEP:
1071                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1072                 break;
1073         case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
1074                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
1075                                                         NFC_PROTO_NFC_DEP_MASK;
1076                 break;
1077         }
1078
1079         nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
1080         nfc_tgt->sel_res = tgt_type_a->sel_res;
1081         nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
1082         memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
1083
1084         return 0;
1085 }
1086
1087 struct pn533_target_felica {
1088         u8 pol_res;
1089         u8 opcode;
1090         u8 nfcid2[8];
1091         u8 pad[8];
1092         /* optional */
1093         u8 syst_code[];
1094 } __packed;
1095
1096 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
1097 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
1098
1099 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
1100                                                         int target_data_len)
1101 {
1102         if (target_data_len < sizeof(struct pn533_target_felica))
1103                 return false;
1104
1105         if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
1106                 return false;
1107
1108         return true;
1109 }
1110
1111 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
1112                                                         int tgt_data_len)
1113 {
1114         struct pn533_target_felica *tgt_felica;
1115
1116         tgt_felica = (struct pn533_target_felica *)tgt_data;
1117
1118         if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
1119                 return -EPROTO;
1120
1121         if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
1122             (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
1123                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1124         else
1125                 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
1126
1127         memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
1128         nfc_tgt->sensf_res_len = 9;
1129
1130         return 0;
1131 }
1132
1133 struct pn533_target_jewel {
1134         __be16 sens_res;
1135         u8 jewelid[4];
1136 } __packed;
1137
1138 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
1139                                                         int target_data_len)
1140 {
1141         u8 ssd;
1142         u8 platconf;
1143
1144         if (target_data_len < sizeof(struct pn533_target_jewel))
1145                 return false;
1146
1147         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1148         ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
1149         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
1150
1151         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1152              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1153             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1154              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1155                 return false;
1156
1157         return true;
1158 }
1159
1160 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
1161                                                         int tgt_data_len)
1162 {
1163         struct pn533_target_jewel *tgt_jewel;
1164
1165         tgt_jewel = (struct pn533_target_jewel *)tgt_data;
1166
1167         if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
1168                 return -EPROTO;
1169
1170         nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
1171         nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
1172         nfc_tgt->nfcid1_len = 4;
1173         memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
1174
1175         return 0;
1176 }
1177
1178 struct pn533_type_b_prot_info {
1179         u8 bitrate;
1180         u8 fsci_type;
1181         u8 fwi_adc_fo;
1182 } __packed;
1183
1184 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
1185 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
1186 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
1187
1188 struct pn533_type_b_sens_res {
1189         u8 opcode;
1190         u8 nfcid[4];
1191         u8 appdata[4];
1192         struct pn533_type_b_prot_info prot_info;
1193 } __packed;
1194
1195 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
1196
1197 struct pn533_target_type_b {
1198         struct pn533_type_b_sens_res sensb_res;
1199         u8 attrib_res_len;
1200         u8 attrib_res[];
1201 } __packed;
1202
1203 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
1204                                                         int target_data_len)
1205 {
1206         if (target_data_len < sizeof(struct pn533_target_type_b))
1207                 return false;
1208
1209         if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
1210                 return false;
1211
1212         if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
1213                                                 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
1214                 return false;
1215
1216         return true;
1217 }
1218
1219 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
1220                                                         int tgt_data_len)
1221 {
1222         struct pn533_target_type_b *tgt_type_b;
1223
1224         tgt_type_b = (struct pn533_target_type_b *)tgt_data;
1225
1226         if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
1227                 return -EPROTO;
1228
1229         nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
1230
1231         return 0;
1232 }
1233
1234 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
1235                               int tgdata_len)
1236 {
1237         struct nfc_target nfc_tgt;
1238         int rc;
1239
1240         nfc_dev_dbg(&dev->interface->dev, "%s - modulation=%d", __func__,
1241                     dev->poll_mod_curr);
1242
1243         if (tg != 1)
1244                 return -EPROTO;
1245
1246         memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1247
1248         switch (dev->poll_mod_curr) {
1249         case PN533_POLL_MOD_106KBPS_A:
1250                 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
1251                 break;
1252         case PN533_POLL_MOD_212KBPS_FELICA:
1253         case PN533_POLL_MOD_424KBPS_FELICA:
1254                 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
1255                 break;
1256         case PN533_POLL_MOD_106KBPS_JEWEL:
1257                 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
1258                 break;
1259         case PN533_POLL_MOD_847KBPS_B:
1260                 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
1261                 break;
1262         default:
1263                 nfc_dev_err(&dev->interface->dev,
1264                             "Unknown current poll modulation");
1265                 return -EPROTO;
1266         }
1267
1268         if (rc)
1269                 return rc;
1270
1271         if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1272                 nfc_dev_dbg(&dev->interface->dev,
1273                             "The Tg found doesn't have the desired protocol");
1274                 return -EAGAIN;
1275         }
1276
1277         nfc_dev_dbg(&dev->interface->dev,
1278                     "Target found - supported protocols: 0x%x",
1279                     nfc_tgt.supported_protocols);
1280
1281         dev->tgt_available_prots = nfc_tgt.supported_protocols;
1282
1283         nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1284
1285         return 0;
1286 }
1287
1288 static inline void pn533_poll_next_mod(struct pn533 *dev)
1289 {
1290         dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
1291 }
1292
1293 static void pn533_poll_reset_mod_list(struct pn533 *dev)
1294 {
1295         dev->poll_mod_count = 0;
1296 }
1297
1298 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
1299 {
1300         dev->poll_mod_active[dev->poll_mod_count] =
1301                 (struct pn533_poll_modulations *)&poll_mod[mod_index];
1302         dev->poll_mod_count++;
1303 }
1304
1305 static void pn533_poll_create_mod_list(struct pn533 *dev,
1306                                        u32 im_protocols, u32 tm_protocols)
1307 {
1308         pn533_poll_reset_mod_list(dev);
1309
1310         if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
1311             (im_protocols & NFC_PROTO_ISO14443_MASK) ||
1312             (im_protocols & NFC_PROTO_NFC_DEP_MASK))
1313                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
1314
1315         if (im_protocols & NFC_PROTO_FELICA_MASK ||
1316             im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1317                 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
1318                 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
1319         }
1320
1321         if (im_protocols & NFC_PROTO_JEWEL_MASK)
1322                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
1323
1324         if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1325                 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
1326
1327         if (tm_protocols)
1328                 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
1329 }
1330
1331 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
1332 {
1333         u8 nbtg, tg, *tgdata;
1334         int rc, tgdata_len;
1335
1336         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1337
1338         nbtg = resp->data[0];
1339         tg = resp->data[1];
1340         tgdata = &resp->data[2];
1341         tgdata_len = resp->len - 2;  /* nbtg + tg */
1342
1343         if (nbtg) {
1344                 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1345
1346                 /* We must stop the poll after a valid target found */
1347                 if (rc == 0) {
1348                         pn533_poll_reset_mod_list(dev);
1349                         return 0;
1350                 }
1351         }
1352
1353         return -EAGAIN;
1354 }
1355
1356 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1357 {
1358         struct sk_buff *skb;
1359         u8 *felica, *nfcid3, *gb;
1360
1361         u8 *gbytes = dev->gb;
1362         size_t gbytes_len = dev->gb_len;
1363
1364         u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1365                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1366                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1367                                 0xff, 0xff}; /* System code */
1368
1369         u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1370                                0x0, 0x0, 0x0,
1371                                0x40}; /* SEL_RES for DEP */
1372
1373         unsigned int skb_len = 36 + /* mode (1), mifare (6),
1374                                        felica (18), nfcid3 (10), gb_len (1) */
1375                                gbytes_len +
1376                                1;  /* len Tk*/
1377
1378         skb = pn533_alloc_skb(dev, skb_len);
1379         if (!skb)
1380                 return NULL;
1381
1382         /* DEP support only */
1383         *skb_put(skb, 1) |= PN533_INIT_TARGET_DEP;
1384
1385         /* MIFARE params */
1386         memcpy(skb_put(skb, 6), mifare_params, 6);
1387
1388         /* Felica params */
1389         felica = skb_put(skb, 18);
1390         memcpy(felica, felica_params, 18);
1391         get_random_bytes(felica + 2, 6);
1392
1393         /* NFCID3 */
1394         nfcid3 = skb_put(skb, 10);
1395         memset(nfcid3, 0, 10);
1396         memcpy(nfcid3, felica, 8);
1397
1398         /* General bytes */
1399         *skb_put(skb, 1) = gbytes_len;
1400
1401         gb = skb_put(skb, gbytes_len);
1402         memcpy(gb, gbytes, gbytes_len);
1403
1404         /* Len Tk */
1405         *skb_put(skb, 1) = 0;
1406
1407         return skb;
1408 }
1409
1410 #define PN533_CMD_DATAEXCH_HEAD_LEN 1
1411 #define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
1412 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1413                                       struct sk_buff *resp)
1414 {
1415         u8 status;
1416
1417         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1418
1419         if (IS_ERR(resp))
1420                 return PTR_ERR(resp);
1421
1422         status = resp->data[0];
1423         skb_pull(resp, sizeof(status));
1424
1425         if (status != 0) {
1426                 nfc_tm_deactivated(dev->nfc_dev);
1427                 dev->tgt_mode = 0;
1428                 dev_kfree_skb(resp);
1429                 return 0;
1430         }
1431
1432         return nfc_tm_data_received(dev->nfc_dev, resp);
1433 }
1434
1435 static void pn533_wq_tg_get_data(struct work_struct *work)
1436 {
1437         struct pn533 *dev = container_of(work, struct pn533, tg_work);
1438
1439         struct sk_buff *skb;
1440         int rc;
1441
1442         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1443
1444         skb = pn533_alloc_skb(dev, 0);
1445         if (!skb)
1446                 return;
1447
1448         rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1449                                    pn533_tm_get_data_complete, NULL);
1450
1451         if (rc < 0)
1452                 dev_kfree_skb(skb);
1453
1454         return;
1455 }
1456
1457 #define ATR_REQ_GB_OFFSET 17
1458 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1459 {
1460         u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1461         size_t gb_len;
1462         int rc;
1463
1464         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1465
1466         if (resp->len < ATR_REQ_GB_OFFSET + 1)
1467                 return -EINVAL;
1468
1469         mode = resp->data[0];
1470         cmd = &resp->data[1];
1471
1472         nfc_dev_dbg(&dev->interface->dev, "Target mode 0x%x len %d\n",
1473                     mode, resp->len);
1474
1475         if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1476             PN533_INIT_TARGET_RESP_ACTIVE)
1477                 comm_mode = NFC_COMM_ACTIVE;
1478
1479         if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0)  /* Only DEP supported */
1480                 return -EOPNOTSUPP;
1481
1482         gb = cmd + ATR_REQ_GB_OFFSET;
1483         gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1484
1485         rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1486                               comm_mode, gb, gb_len);
1487         if (rc < 0) {
1488                 nfc_dev_err(&dev->interface->dev,
1489                             "Error when signaling target activation");
1490                 return rc;
1491         }
1492
1493         dev->tgt_mode = 1;
1494         queue_work(dev->wq, &dev->tg_work);
1495
1496         return 0;
1497 }
1498
1499 static void pn533_listen_mode_timer(unsigned long data)
1500 {
1501         struct pn533 *dev = (struct pn533 *)data;
1502
1503         nfc_dev_dbg(&dev->interface->dev, "Listen mode timeout");
1504
1505         /* An ack will cancel the last issued command (poll) */
1506         pn533_send_ack(dev, GFP_ATOMIC);
1507
1508         dev->cancel_listen = 1;
1509
1510         pn533_poll_next_mod(dev);
1511
1512         queue_work(dev->wq, &dev->poll_work);
1513 }
1514
1515 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1516                                struct sk_buff *resp)
1517 {
1518         struct pn533_poll_modulations *cur_mod;
1519         int rc;
1520
1521         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1522
1523         if (IS_ERR(resp)) {
1524                 rc = PTR_ERR(resp);
1525
1526                 nfc_dev_err(&dev->interface->dev, "%s  Poll complete error %d",
1527                             __func__, rc);
1528
1529                 if (rc == -ENOENT) {
1530                         if (dev->poll_mod_count != 0)
1531                                 return rc;
1532                         else
1533                                 goto stop_poll;
1534                 } else if (rc < 0) {
1535                         nfc_dev_err(&dev->interface->dev,
1536                                     "Error %d when running poll", rc);
1537                         goto stop_poll;
1538                 }
1539         }
1540
1541         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1542
1543         if (cur_mod->len == 0) { /* Target mode */
1544                 del_timer(&dev->listen_timer);
1545                 rc = pn533_init_target_complete(dev, resp);
1546                 goto done;
1547         }
1548
1549         /* Initiator mode */
1550         rc = pn533_start_poll_complete(dev, resp);
1551         if (!rc)
1552                 goto done;
1553
1554         pn533_poll_next_mod(dev);
1555         queue_work(dev->wq, &dev->poll_work);
1556
1557 done:
1558         dev_kfree_skb(resp);
1559         return rc;
1560
1561 stop_poll:
1562         nfc_dev_err(&dev->interface->dev, "Polling operation has been stopped");
1563
1564         pn533_poll_reset_mod_list(dev);
1565         dev->poll_protocols = 0;
1566         return rc;
1567 }
1568
1569 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1570                                         struct pn533_poll_modulations *mod)
1571 {
1572         struct sk_buff *skb;
1573
1574         skb = pn533_alloc_skb(dev, mod->len);
1575         if (!skb)
1576                 return NULL;
1577
1578         memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
1579
1580         return skb;
1581 }
1582
1583 static int pn533_send_poll_frame(struct pn533 *dev)
1584 {
1585         struct pn533_poll_modulations *mod;
1586         struct sk_buff *skb;
1587         int rc;
1588         u8 cmd_code;
1589
1590         mod = dev->poll_mod_active[dev->poll_mod_curr];
1591
1592         nfc_dev_dbg(&dev->interface->dev, "%s mod len %d\n",
1593                     __func__, mod->len);
1594
1595         if (mod->len == 0) {  /* Listen mode */
1596                 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1597                 skb = pn533_alloc_poll_tg_frame(dev);
1598         } else {  /* Polling mode */
1599                 cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
1600                 skb = pn533_alloc_poll_in_frame(dev, mod);
1601         }
1602
1603         if (!skb) {
1604                 nfc_dev_err(&dev->interface->dev, "Failed to allocate skb.");
1605                 return -ENOMEM;
1606         }
1607
1608         rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1609                                   NULL);
1610         if (rc < 0) {
1611                 dev_kfree_skb(skb);
1612                 nfc_dev_err(&dev->interface->dev, "Polling loop error %d", rc);
1613         }
1614
1615         return rc;
1616 }
1617
1618 static void pn533_wq_poll(struct work_struct *work)
1619 {
1620         struct pn533 *dev = container_of(work, struct pn533, poll_work);
1621         struct pn533_poll_modulations *cur_mod;
1622         int rc;
1623
1624         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1625
1626         nfc_dev_dbg(&dev->interface->dev,
1627                     "%s cancel_listen %d modulation len %d",
1628                     __func__, dev->cancel_listen, cur_mod->len);
1629
1630         if (dev->cancel_listen == 1) {
1631                 dev->cancel_listen = 0;
1632                 usb_kill_urb(dev->in_urb);
1633         }
1634
1635         rc = pn533_send_poll_frame(dev);
1636         if (rc)
1637                 return;
1638
1639         if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1640                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1641
1642         return;
1643 }
1644
1645 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1646                             u32 im_protocols, u32 tm_protocols)
1647 {
1648         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1649
1650         nfc_dev_dbg(&dev->interface->dev,
1651                     "%s: im protocols 0x%x tm protocols 0x%x",
1652                     __func__, im_protocols, tm_protocols);
1653
1654         if (dev->tgt_active_prot) {
1655                 nfc_dev_err(&dev->interface->dev,
1656                             "Cannot poll with a target already activated");
1657                 return -EBUSY;
1658         }
1659
1660         if (dev->tgt_mode) {
1661                 nfc_dev_err(&dev->interface->dev,
1662                             "Cannot poll while already being activated");
1663                 return -EBUSY;
1664         }
1665
1666         if (tm_protocols) {
1667                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1668                 if (dev->gb == NULL)
1669                         tm_protocols = 0;
1670         }
1671
1672         dev->poll_mod_curr = 0;
1673         pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1674         dev->poll_protocols = im_protocols;
1675         dev->listen_protocols = tm_protocols;
1676
1677         return pn533_send_poll_frame(dev);
1678 }
1679
1680 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1681 {
1682         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1683
1684         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1685
1686         del_timer(&dev->listen_timer);
1687
1688         if (!dev->poll_mod_count) {
1689                 nfc_dev_dbg(&dev->interface->dev,
1690                             "Polling operation was not running");
1691                 return;
1692         }
1693
1694         /* An ack will cancel the last issued command (poll) */
1695         pn533_send_ack(dev, GFP_KERNEL);
1696
1697         /* prevent pn533_start_poll_complete to issue a new poll meanwhile */
1698         usb_kill_urb(dev->in_urb);
1699
1700         pn533_poll_reset_mod_list(dev);
1701 }
1702
1703 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1704 {
1705         struct pn533_cmd_activate_response *rsp;
1706         u16 gt_len;
1707         int rc;
1708
1709         struct sk_buff *skb;
1710         struct sk_buff *resp;
1711
1712         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1713
1714         skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1715         if (!skb)
1716                 return -ENOMEM;
1717
1718         *skb_put(skb, sizeof(u8)) = 1; /* TG */
1719         *skb_put(skb, sizeof(u8)) = 0; /* Next */
1720
1721         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1722         if (IS_ERR(resp))
1723                 return PTR_ERR(resp);
1724
1725         rsp = (struct pn533_cmd_activate_response *)resp->data;
1726         rc = rsp->status & PN533_CMD_RET_MASK;
1727         if (rc != PN533_CMD_RET_SUCCESS) {
1728                 dev_kfree_skb(resp);
1729                 return -EIO;
1730         }
1731
1732         /* ATR_RES general bytes are located at offset 16 */
1733         gt_len = resp->len - 16;
1734         rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1735
1736         dev_kfree_skb(resp);
1737         return rc;
1738 }
1739
1740 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1741                                  struct nfc_target *target, u32 protocol)
1742 {
1743         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1744         int rc;
1745
1746         nfc_dev_dbg(&dev->interface->dev, "%s - protocol=%u", __func__,
1747                     protocol);
1748
1749         if (dev->poll_mod_count) {
1750                 nfc_dev_err(&dev->interface->dev,
1751                             "Cannot activate while polling");
1752                 return -EBUSY;
1753         }
1754
1755         if (dev->tgt_active_prot) {
1756                 nfc_dev_err(&dev->interface->dev,
1757                             "There is already an active target");
1758                 return -EBUSY;
1759         }
1760
1761         if (!dev->tgt_available_prots) {
1762                 nfc_dev_err(&dev->interface->dev,
1763                             "There is no available target to activate");
1764                 return -EINVAL;
1765         }
1766
1767         if (!(dev->tgt_available_prots & (1 << protocol))) {
1768                 nfc_dev_err(&dev->interface->dev,
1769                             "Target doesn't support requested proto %u",
1770                             protocol);
1771                 return -EINVAL;
1772         }
1773
1774         if (protocol == NFC_PROTO_NFC_DEP) {
1775                 rc = pn533_activate_target_nfcdep(dev);
1776                 if (rc) {
1777                         nfc_dev_err(&dev->interface->dev,
1778                                     "Activating target with DEP failed %d", rc);
1779                         return rc;
1780                 }
1781         }
1782
1783         dev->tgt_active_prot = protocol;
1784         dev->tgt_available_prots = 0;
1785
1786         return 0;
1787 }
1788
1789 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1790                                     struct nfc_target *target)
1791 {
1792         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1793
1794         struct sk_buff *skb;
1795         struct sk_buff *resp;
1796
1797         int rc;
1798
1799         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1800
1801         if (!dev->tgt_active_prot) {
1802                 nfc_dev_err(&dev->interface->dev, "There is no active target");
1803                 return;
1804         }
1805
1806         dev->tgt_active_prot = 0;
1807         skb_queue_purge(&dev->resp_q);
1808
1809         skb = pn533_alloc_skb(dev, sizeof(u8));
1810         if (!skb)
1811                 return;
1812
1813         *skb_put(skb, 1) = 1; /* TG*/
1814
1815         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_RELEASE, skb);
1816         if (IS_ERR(resp))
1817                 return;
1818
1819         rc = resp->data[0] & PN533_CMD_RET_MASK;
1820         if (rc != PN533_CMD_RET_SUCCESS)
1821                 nfc_dev_err(&dev->interface->dev,
1822                             "Error 0x%x when releasing the target", rc);
1823
1824         dev_kfree_skb(resp);
1825         return;
1826 }
1827
1828
1829 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1830                                          struct sk_buff *resp)
1831 {
1832         struct pn533_cmd_jump_dep_response *rsp;
1833         u8 target_gt_len;
1834         int rc;
1835         u8 active = *(u8 *)arg;
1836
1837         kfree(arg);
1838
1839         if (IS_ERR(resp))
1840                 return PTR_ERR(resp);
1841
1842         if (dev->tgt_available_prots &&
1843             !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1844                 nfc_dev_err(&dev->interface->dev,
1845                             "The target does not support DEP");
1846                 rc =  -EINVAL;
1847                 goto error;
1848         }
1849
1850         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1851
1852         rc = rsp->status & PN533_CMD_RET_MASK;
1853         if (rc != PN533_CMD_RET_SUCCESS) {
1854                 nfc_dev_err(&dev->interface->dev,
1855                             "Bringing DEP link up failed %d", rc);
1856                 goto error;
1857         }
1858
1859         if (!dev->tgt_available_prots) {
1860                 struct nfc_target nfc_target;
1861
1862                 nfc_dev_dbg(&dev->interface->dev, "Creating new target");
1863
1864                 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1865                 nfc_target.nfcid1_len = 10;
1866                 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1867                 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1868                 if (rc)
1869                         goto error;
1870
1871                 dev->tgt_available_prots = 0;
1872         }
1873
1874         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1875
1876         /* ATR_RES general bytes are located at offset 17 */
1877         target_gt_len = resp->len - 17;
1878         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1879                                           rsp->gt, target_gt_len);
1880         if (rc == 0)
1881                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1882                                         dev->nfc_dev->targets[0].idx,
1883                                         !active, NFC_RF_INITIATOR);
1884
1885 error:
1886         dev_kfree_skb(resp);
1887         return rc;
1888 }
1889
1890 static int pn533_mod_to_baud(struct pn533 *dev)
1891 {
1892         switch (dev->poll_mod_curr) {
1893         case PN533_POLL_MOD_106KBPS_A:
1894                 return 0;
1895         case PN533_POLL_MOD_212KBPS_FELICA:
1896                 return 1;
1897         case PN533_POLL_MOD_424KBPS_FELICA:
1898                 return 2;
1899         default:
1900                 return -EINVAL;
1901         }
1902 }
1903
1904 #define PASSIVE_DATA_LEN 5
1905 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1906                              u8 comm_mode, u8 *gb, size_t gb_len)
1907 {
1908         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1909         struct sk_buff *skb;
1910         int rc, baud, skb_len;
1911         u8 *next, *arg;
1912
1913         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1914
1915         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1916
1917         if (dev->poll_mod_count) {
1918                 nfc_dev_err(&dev->interface->dev,
1919                             "Cannot bring the DEP link up while polling");
1920                 return -EBUSY;
1921         }
1922
1923         if (dev->tgt_active_prot) {
1924                 nfc_dev_err(&dev->interface->dev,
1925                             "There is already an active target");
1926                 return -EBUSY;
1927         }
1928
1929         baud = pn533_mod_to_baud(dev);
1930         if (baud < 0) {
1931                 nfc_dev_err(&dev->interface->dev,
1932                             "Invalid curr modulation %d", dev->poll_mod_curr);
1933                 return baud;
1934         }
1935
1936         skb_len = 3 + gb_len; /* ActPass + BR + Next */
1937         if (comm_mode == NFC_COMM_PASSIVE)
1938                 skb_len += PASSIVE_DATA_LEN;
1939
1940         skb = pn533_alloc_skb(dev, skb_len);
1941         if (!skb)
1942                 return -ENOMEM;
1943
1944         *skb_put(skb, 1) = !comm_mode;  /* ActPass */
1945         *skb_put(skb, 1) = baud;  /* Baud rate */
1946
1947         next = skb_put(skb, 1);  /* Next */
1948         *next = 0;
1949
1950         if (comm_mode == NFC_COMM_PASSIVE && baud > 0) {
1951                 memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data,
1952                        PASSIVE_DATA_LEN);
1953                 *next |= 1;
1954         }
1955
1956         if (gb != NULL && gb_len > 0) {
1957                 memcpy(skb_put(skb, gb_len), gb, gb_len);
1958                 *next |= 4; /* We have some Gi */
1959         } else {
1960                 *next = 0;
1961         }
1962
1963         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
1964         if (!arg) {
1965                 dev_kfree_skb(skb);
1966                 return -ENOMEM;
1967         }
1968
1969         *arg = !comm_mode;
1970
1971         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1972                                   pn533_in_dep_link_up_complete, arg);
1973
1974         if (rc < 0) {
1975                 dev_kfree_skb(skb);
1976                 kfree(arg);
1977         }
1978
1979         return rc;
1980 }
1981
1982 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
1983 {
1984         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1985
1986         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1987
1988         pn533_poll_reset_mod_list(dev);
1989
1990         if (dev->tgt_mode || dev->tgt_active_prot) {
1991                 pn533_send_ack(dev, GFP_KERNEL);
1992                 usb_kill_urb(dev->in_urb);
1993         }
1994
1995         dev->tgt_active_prot = 0;
1996         dev->tgt_mode = 0;
1997
1998         skb_queue_purge(&dev->resp_q);
1999
2000         return 0;
2001 }
2002
2003 struct pn533_data_exchange_arg {
2004         data_exchange_cb_t cb;
2005         void *cb_context;
2006 };
2007
2008 static struct sk_buff *pn533_build_response(struct pn533 *dev)
2009 {
2010         struct sk_buff *skb, *tmp, *t;
2011         unsigned int skb_len = 0, tmp_len = 0;
2012
2013         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2014
2015         if (skb_queue_empty(&dev->resp_q))
2016                 return NULL;
2017
2018         if (skb_queue_len(&dev->resp_q) == 1) {
2019                 skb = skb_dequeue(&dev->resp_q);
2020                 goto out;
2021         }
2022
2023         skb_queue_walk_safe(&dev->resp_q, tmp, t)
2024                 skb_len += tmp->len;
2025
2026         nfc_dev_dbg(&dev->interface->dev, "%s total length %d\n",
2027                     __func__, skb_len);
2028
2029         skb = alloc_skb(skb_len, GFP_KERNEL);
2030         if (skb == NULL)
2031                 goto out;
2032
2033         skb_put(skb, skb_len);
2034
2035         skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2036                 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2037                 tmp_len += tmp->len;
2038         }
2039
2040 out:
2041         skb_queue_purge(&dev->resp_q);
2042
2043         return skb;
2044 }
2045
2046 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2047                                         struct sk_buff *resp)
2048 {
2049         struct pn533_data_exchange_arg *arg = _arg;
2050         struct sk_buff *skb;
2051         int rc = 0;
2052         u8 status, ret, mi;
2053
2054         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2055
2056         if (IS_ERR(resp)) {
2057                 rc = PTR_ERR(resp);
2058                 goto _error;
2059         }
2060
2061         status = resp->data[0];
2062         ret = status & PN533_CMD_RET_MASK;
2063         mi = status & PN533_CMD_MI_MASK;
2064
2065         skb_pull(resp, sizeof(status));
2066
2067         if (ret != PN533_CMD_RET_SUCCESS) {
2068                 nfc_dev_err(&dev->interface->dev,
2069                             "PN533 reported error %d when exchanging data",
2070                             ret);
2071                 rc = -EIO;
2072                 goto error;
2073         }
2074
2075         skb_queue_tail(&dev->resp_q, resp);
2076
2077         if (mi) {
2078                 dev->cmd_complete_mi_arg = arg;
2079                 queue_work(dev->wq, &dev->mi_work);
2080                 return -EINPROGRESS;
2081         }
2082
2083         skb = pn533_build_response(dev);
2084         if (!skb)
2085                 goto error;
2086
2087         arg->cb(arg->cb_context, skb, 0);
2088         kfree(arg);
2089         return 0;
2090
2091 error:
2092         dev_kfree_skb(resp);
2093 _error:
2094         skb_queue_purge(&dev->resp_q);
2095         arg->cb(arg->cb_context, NULL, rc);
2096         kfree(arg);
2097         return rc;
2098 }
2099
2100 static int pn533_transceive(struct nfc_dev *nfc_dev,
2101                             struct nfc_target *target, struct sk_buff *skb,
2102                             data_exchange_cb_t cb, void *cb_context)
2103 {
2104         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2105         struct pn533_data_exchange_arg *arg = NULL;
2106         int rc;
2107
2108         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2109
2110         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2111                 /* TODO: Implement support to multi-part data exchange */
2112                 nfc_dev_err(&dev->interface->dev,
2113                             "Data length greater than the max allowed: %d",
2114                             PN533_CMD_DATAEXCH_DATA_MAXLEN);
2115                 rc = -ENOSYS;
2116                 goto error;
2117         }
2118
2119         if (!dev->tgt_active_prot) {
2120                 nfc_dev_err(&dev->interface->dev,
2121                             "Can't exchange data if there is no active target");
2122                 rc = -EINVAL;
2123                 goto error;
2124         }
2125
2126         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2127         if (!arg) {
2128                 rc = -ENOMEM;
2129                 goto error;
2130         }
2131
2132         arg->cb = cb;
2133         arg->cb_context = cb_context;
2134
2135         switch (dev->device_type) {
2136         case PN533_DEVICE_PASORI:
2137                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2138                         rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2139                                                    skb,
2140                                                    pn533_data_exchange_complete,
2141                                                    arg);
2142
2143                         break;
2144                 }
2145         default:
2146                 *skb_push(skb, sizeof(u8)) =  1; /*TG*/
2147
2148                 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2149                                            skb, pn533_data_exchange_complete,
2150                                            arg);
2151
2152                 break;
2153         }
2154
2155         if (rc < 0) /* rc from send_async */
2156                 goto error;
2157
2158         return 0;
2159
2160 error:
2161         kfree(arg);
2162         dev_kfree_skb(skb);
2163         return rc;
2164 }
2165
2166 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2167                                   struct sk_buff *resp)
2168 {
2169         u8 status;
2170
2171         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2172
2173         if (IS_ERR(resp))
2174                 return PTR_ERR(resp);
2175
2176         status = resp->data[0];
2177
2178         dev_kfree_skb(resp);
2179
2180         if (status != 0) {
2181                 nfc_tm_deactivated(dev->nfc_dev);
2182
2183                 dev->tgt_mode = 0;
2184
2185                 return 0;
2186         }
2187
2188         queue_work(dev->wq, &dev->tg_work);
2189
2190         return 0;
2191 }
2192
2193 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2194 {
2195         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2196         int rc;
2197
2198         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2199
2200         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2201                 nfc_dev_err(&dev->interface->dev,
2202                             "Data length greater than the max allowed: %d",
2203                             PN533_CMD_DATAEXCH_DATA_MAXLEN);
2204                 return -ENOSYS;
2205         }
2206
2207         rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2208                                    pn533_tm_send_complete, NULL);
2209         if (rc < 0)
2210                 dev_kfree_skb(skb);
2211
2212         return rc;
2213 }
2214
2215 static void pn533_wq_mi_recv(struct work_struct *work)
2216 {
2217         struct pn533 *dev = container_of(work, struct pn533, mi_work);
2218
2219         struct sk_buff *skb;
2220         int rc;
2221
2222         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2223
2224         skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2225         if (!skb)
2226                 goto error;
2227
2228         switch (dev->device_type) {
2229         case PN533_DEVICE_PASORI:
2230                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2231                         rc = pn533_send_cmd_direct_async(dev,
2232                                                 PN533_CMD_IN_COMM_THRU,
2233                                                 skb,
2234                                                 pn533_data_exchange_complete,
2235                                                  dev->cmd_complete_mi_arg);
2236
2237                         break;
2238                 }
2239         default:
2240                 *skb_put(skb, sizeof(u8)) =  1; /*TG*/
2241
2242                 rc = pn533_send_cmd_direct_async(dev,
2243                                                  PN533_CMD_IN_DATA_EXCHANGE,
2244                                                  skb,
2245                                                  pn533_data_exchange_complete,
2246                                                  dev->cmd_complete_mi_arg);
2247
2248                 break;
2249         }
2250
2251         if (rc == 0) /* success */
2252                 return;
2253
2254         nfc_dev_err(&dev->interface->dev,
2255                     "Error %d when trying to perform data_exchange", rc);
2256
2257         dev_kfree_skb(skb);
2258         kfree(dev->cmd_complete_arg);
2259
2260 error:
2261         pn533_send_ack(dev, GFP_KERNEL);
2262         queue_work(dev->wq, &dev->cmd_work);
2263 }
2264
2265 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2266                                                                 u8 cfgdata_len)
2267 {
2268         struct sk_buff *skb;
2269         struct sk_buff *resp;
2270
2271         int skb_len;
2272
2273         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2274
2275         skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2276
2277         skb = pn533_alloc_skb(dev, skb_len);
2278         if (!skb)
2279                 return -ENOMEM;
2280
2281         *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2282         memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2283
2284         resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2285         if (IS_ERR(resp))
2286                 return PTR_ERR(resp);
2287
2288         dev_kfree_skb(resp);
2289         return 0;
2290 }
2291
2292 static int pn533_get_firmware_version(struct pn533 *dev,
2293                                       struct pn533_fw_version *fv)
2294 {
2295         struct sk_buff *skb;
2296         struct sk_buff *resp;
2297
2298         skb = pn533_alloc_skb(dev, 0);
2299         if (!skb)
2300                 return -ENOMEM;
2301
2302         resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2303         if (IS_ERR(resp))
2304                 return PTR_ERR(resp);
2305
2306         fv->ic = resp->data[0];
2307         fv->ver = resp->data[1];
2308         fv->rev = resp->data[2];
2309         fv->support = resp->data[3];
2310
2311         dev_kfree_skb(resp);
2312         return 0;
2313 }
2314
2315 static int pn533_fw_reset(struct pn533 *dev)
2316 {
2317         struct sk_buff *skb;
2318         struct sk_buff *resp;
2319
2320         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2321
2322         skb = pn533_alloc_skb(dev, sizeof(u8));
2323         if (!skb)
2324                 return -ENOMEM;
2325
2326         *skb_put(skb, sizeof(u8)) = 0x1;
2327
2328         resp = pn533_send_cmd_sync(dev, 0x18, skb);
2329         if (IS_ERR(resp))
2330                 return PTR_ERR(resp);
2331
2332         dev_kfree_skb(resp);
2333
2334         return 0;
2335 }
2336
2337 static struct nfc_ops pn533_nfc_ops = {
2338         .dev_up = NULL,
2339         .dev_down = NULL,
2340         .dep_link_up = pn533_dep_link_up,
2341         .dep_link_down = pn533_dep_link_down,
2342         .start_poll = pn533_start_poll,
2343         .stop_poll = pn533_stop_poll,
2344         .activate_target = pn533_activate_target,
2345         .deactivate_target = pn533_deactivate_target,
2346         .im_transceive = pn533_transceive,
2347         .tm_send = pn533_tm_send,
2348 };
2349
2350 static int pn533_setup(struct pn533 *dev)
2351 {
2352         struct pn533_config_max_retries max_retries;
2353         struct pn533_config_timing timing;
2354         u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2355         int rc;
2356
2357         switch (dev->device_type) {
2358         case PN533_DEVICE_STD:
2359                 max_retries.mx_rty_atr = PN533_CONFIG_MAX_RETRIES_ENDLESS;
2360                 max_retries.mx_rty_psl = 2;
2361                 max_retries.mx_rty_passive_act =
2362                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2363
2364                 timing.rfu = PN533_CONFIG_TIMING_102;
2365                 timing.atr_res_timeout = PN533_CONFIG_TIMING_204;
2366                 timing.dep_timeout = PN533_CONFIG_TIMING_409;
2367
2368                 break;
2369
2370         case PN533_DEVICE_PASORI:
2371                 max_retries.mx_rty_atr = 0x2;
2372                 max_retries.mx_rty_psl = 0x1;
2373                 max_retries.mx_rty_passive_act =
2374                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2375
2376                 timing.rfu = PN533_CONFIG_TIMING_102;
2377                 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2378                 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2379
2380                 break;
2381
2382         default:
2383                 nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2384                             dev->device_type);
2385                 return -EINVAL;
2386         }
2387
2388         rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2389                                      (u8 *)&max_retries, sizeof(max_retries));
2390         if (rc) {
2391                 nfc_dev_err(&dev->interface->dev,
2392                             "Error on setting MAX_RETRIES config");
2393                 return rc;
2394         }
2395
2396
2397         rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2398                                      (u8 *)&timing, sizeof(timing));
2399         if (rc) {
2400                 nfc_dev_err(&dev->interface->dev,
2401                             "Error on setting RF timings");
2402                 return rc;
2403         }
2404
2405         switch (dev->device_type) {
2406         case PN533_DEVICE_STD:
2407                 break;
2408
2409         case PN533_DEVICE_PASORI:
2410                 pn533_fw_reset(dev);
2411
2412                 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2413                                              pasori_cfg, 3);
2414                 if (rc) {
2415                         nfc_dev_err(&dev->interface->dev,
2416                                     "Error while settings PASORI config");
2417                         return rc;
2418                 }
2419
2420                 pn533_fw_reset(dev);
2421
2422                 break;
2423         }
2424
2425         return 0;
2426 }
2427
2428 static int pn533_probe(struct usb_interface *interface,
2429                         const struct usb_device_id *id)
2430 {
2431         struct pn533_fw_version fw_ver;
2432         struct pn533 *dev;
2433         struct usb_host_interface *iface_desc;
2434         struct usb_endpoint_descriptor *endpoint;
2435         int in_endpoint = 0;
2436         int out_endpoint = 0;
2437         int rc = -ENOMEM;
2438         int i;
2439         u32 protocols;
2440
2441         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2442         if (!dev)
2443                 return -ENOMEM;
2444
2445         dev->udev = usb_get_dev(interface_to_usbdev(interface));
2446         dev->interface = interface;
2447         mutex_init(&dev->cmd_lock);
2448
2449         iface_desc = interface->cur_altsetting;
2450         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
2451                 endpoint = &iface_desc->endpoint[i].desc;
2452
2453                 if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
2454                         in_endpoint = endpoint->bEndpointAddress;
2455
2456                 if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
2457                         out_endpoint = endpoint->bEndpointAddress;
2458         }
2459
2460         if (!in_endpoint || !out_endpoint) {
2461                 nfc_dev_err(&interface->dev,
2462                             "Could not find bulk-in or bulk-out endpoint");
2463                 rc = -ENODEV;
2464                 goto error;
2465         }
2466
2467         dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
2468         dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
2469
2470         if (!dev->in_urb || !dev->out_urb)
2471                 goto error;
2472
2473         usb_fill_bulk_urb(dev->in_urb, dev->udev,
2474                           usb_rcvbulkpipe(dev->udev, in_endpoint),
2475                           NULL, 0, NULL, dev);
2476         usb_fill_bulk_urb(dev->out_urb, dev->udev,
2477                           usb_sndbulkpipe(dev->udev, out_endpoint),
2478                           NULL, 0, pn533_send_complete, dev);
2479
2480         INIT_WORK(&dev->cmd_work, pn533_wq_cmd);
2481         INIT_WORK(&dev->cmd_complete_work, pn533_wq_cmd_complete);
2482         INIT_WORK(&dev->mi_work, pn533_wq_mi_recv);
2483         INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
2484         INIT_WORK(&dev->poll_work, pn533_wq_poll);
2485         dev->wq = alloc_ordered_workqueue("pn533", 0);
2486         if (dev->wq == NULL)
2487                 goto error;
2488
2489         init_timer(&dev->listen_timer);
2490         dev->listen_timer.data = (unsigned long) dev;
2491         dev->listen_timer.function = pn533_listen_mode_timer;
2492
2493         skb_queue_head_init(&dev->resp_q);
2494
2495         INIT_LIST_HEAD(&dev->cmd_queue);
2496
2497         usb_set_intfdata(interface, dev);
2498
2499         dev->ops = &pn533_std_frame_ops;
2500
2501         dev->device_type = id->driver_info;
2502         switch (dev->device_type) {
2503         case PN533_DEVICE_STD:
2504                 protocols = PN533_ALL_PROTOCOLS;
2505                 break;
2506
2507         case PN533_DEVICE_PASORI:
2508                 protocols = PN533_NO_TYPE_B_PROTOCOLS;
2509                 break;
2510
2511         default:
2512                 nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2513                             dev->device_type);
2514                 rc = -EINVAL;
2515                 goto destroy_wq;
2516         }
2517
2518         memset(&fw_ver, 0, sizeof(fw_ver));
2519         rc = pn533_get_firmware_version(dev, &fw_ver);
2520         if (rc < 0)
2521                 goto destroy_wq;
2522
2523         nfc_dev_info(&dev->interface->dev,
2524                      "NXP PN533 firmware ver %d.%d now attached",
2525                      fw_ver.ver, fw_ver.rev);
2526
2527
2528         dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2529                                            NFC_SE_NONE,
2530                                            dev->ops->tx_header_len +
2531                                            PN533_CMD_DATAEXCH_HEAD_LEN,
2532                                            dev->ops->tx_tail_len);
2533         if (!dev->nfc_dev)
2534                 goto destroy_wq;
2535
2536         nfc_set_parent_dev(dev->nfc_dev, &interface->dev);
2537         nfc_set_drvdata(dev->nfc_dev, dev);
2538
2539         rc = nfc_register_device(dev->nfc_dev);
2540         if (rc)
2541                 goto free_nfc_dev;
2542
2543         rc = pn533_setup(dev);
2544         if (rc)
2545                 goto unregister_nfc_dev;
2546
2547         return 0;
2548
2549 unregister_nfc_dev:
2550         nfc_unregister_device(dev->nfc_dev);
2551
2552 free_nfc_dev:
2553         nfc_free_device(dev->nfc_dev);
2554
2555 destroy_wq:
2556         destroy_workqueue(dev->wq);
2557 error:
2558         usb_free_urb(dev->in_urb);
2559         usb_free_urb(dev->out_urb);
2560         kfree(dev);
2561         return rc;
2562 }
2563
2564 static void pn533_disconnect(struct usb_interface *interface)
2565 {
2566         struct pn533 *dev;
2567         struct pn533_cmd *cmd, *n;
2568
2569         dev = usb_get_intfdata(interface);
2570         usb_set_intfdata(interface, NULL);
2571
2572         nfc_unregister_device(dev->nfc_dev);
2573         nfc_free_device(dev->nfc_dev);
2574
2575         usb_kill_urb(dev->in_urb);
2576         usb_kill_urb(dev->out_urb);
2577
2578         destroy_workqueue(dev->wq);
2579
2580         skb_queue_purge(&dev->resp_q);
2581
2582         del_timer(&dev->listen_timer);
2583
2584         list_for_each_entry_safe(cmd, n, &dev->cmd_queue, queue) {
2585                 list_del(&cmd->queue);
2586                 kfree(cmd);
2587         }
2588
2589         usb_free_urb(dev->in_urb);
2590         usb_free_urb(dev->out_urb);
2591         kfree(dev);
2592
2593         nfc_dev_info(&interface->dev, "NXP PN533 NFC device disconnected");
2594 }
2595
2596 static struct usb_driver pn533_driver = {
2597         .name =         "pn533",
2598         .probe =        pn533_probe,
2599         .disconnect =   pn533_disconnect,
2600         .id_table =     pn533_table,
2601 };
2602
2603 module_usb_driver(pn533_driver);
2604
2605 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>,"
2606                         " Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2607 MODULE_DESCRIPTION("PN533 usb driver ver " VERSION);
2608 MODULE_VERSION(VERSION);
2609 MODULE_LICENSE("GPL");