drivers/nfc/pn533.c

   1 /*
   2  * Copyright (C) 2011 Instituto Nokia de Tecnologia
   3  *
   4  * Authors:
   5  *    Lauro Ramos Venancio <lauro.venancio@openbossa.org>
   6  *    Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the
  20  * Free Software Foundation, Inc.,
  21  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23
  24 #include <linux/device.h>
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/slab.h>
  28 #include <linux/usb.h>
  29 #include <linux/nfc.h>
  30 #include <linux/netdevice.h>
  31 #include <net/nfc/nfc.h>
  32
  33 #define VERSION "0.1"
  34
  35 #define PN533_VENDOR_ID 0x4CC
  36 #define PN533_PRODUCT_ID 0x2533
  37
  38 #define SCM_VENDOR_ID 0x4E6
  39 #define SCL3711_PRODUCT_ID 0x5591
  40
  41 #define SONY_VENDOR_ID         0x054c
  42 #define PASORI_PRODUCT_ID      0x02e1
  43
  44 #define PN533_DEVICE_STD    0x1
  45 #define PN533_DEVICE_PASORI 0x2
  46
  47 #define PN533_ALL_PROTOCOLS (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK |\
  48                              NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK |\
  49                              NFC_PROTO_NFC_DEP_MASK |\
  50                              NFC_PROTO_ISO14443_B_MASK)
  51
  52 #define PN533_NO_TYPE_B_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
  53                                    NFC_PROTO_MIFARE_MASK | \
  54                                    NFC_PROTO_FELICA_MASK | \
  55                                    NFC_PROTO_ISO14443_MASK | \
  56                                    NFC_PROTO_NFC_DEP_MASK)
  57
  58 static const struct usb_device_id pn533_table[] = {
  59         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE,
  60           .idVendor             = PN533_VENDOR_ID,
  61           .idProduct            = PN533_PRODUCT_ID,
  62           .driver_info          = PN533_DEVICE_STD,
  63         },
  64         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE,
  65           .idVendor             = SCM_VENDOR_ID,
  66           .idProduct            = SCL3711_PRODUCT_ID,
  67           .driver_info          = PN533_DEVICE_STD,
  68         },
  69         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE,
  70           .idVendor             = SONY_VENDOR_ID,
  71           .idProduct            = PASORI_PRODUCT_ID,
  72           .driver_info          = PN533_DEVICE_PASORI,
  73         },
  74         { }
  75 };
  76 MODULE_DEVICE_TABLE(usb, pn533_table);
  77
  78 /* How much time we spend listening for initiators */
  79 #define PN533_LISTEN_TIME 2
  80
  81 /* frame definitions */
  82 #define PN533_NORMAL_FRAME_MAX_LEN 262  /* 6   (PREAMBLE, SOF, LEN, LCS, TFI)
  83                                            254 (DATA)
  84                                            2   (DCS, postamble) */
  85 #define PN533_FRAME_HEADER_LEN (sizeof(struct pn533_frame) \
  86                                         + 2) /* data[0] TFI, data[1] CC */
  87 #define PN533_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
  88
  89 /*
  90  * Max extended frame payload len, excluding TFI and CC
  91  * which are already in PN533_FRAME_HEADER_LEN.
  92  */
  93 #define PN533_FRAME_MAX_PAYLOAD_LEN 263
  94
  95 #define PN533_FRAME_SIZE(f) (sizeof(struct pn533_frame) + f->datalen + \
  96                                 PN533_FRAME_TAIL_LEN)
  97 #define PN533_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2),
  98                                   Postamble (1) */
  99 #define PN533_FRAME_CHECKSUM(f) (f->data[f->datalen])
 100 #define PN533_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])
 101
 102 /* start of frame */
 103 #define PN533_SOF 0x00FF
 104
 105 /* frame identifier: in/out/error */
 106 #define PN533_FRAME_IDENTIFIER(f) (f->data[0])
 107 #define PN533_DIR_OUT 0xD4
 108 #define PN533_DIR_IN 0xD5
 109
 110 /* PN533 Commands */
 111 #define PN533_FRAME_CMD(f) (f->data[1])
 112
 113 #define PN533_CMD_GET_FIRMWARE_VERSION 0x02
 114 #define PN533_CMD_RF_CONFIGURATION 0x32
 115 #define PN533_CMD_IN_DATA_EXCHANGE 0x40
 116 #define PN533_CMD_IN_COMM_THRU     0x42
 117 #define PN533_CMD_IN_LIST_PASSIVE_TARGET 0x4A
 118 #define PN533_CMD_IN_ATR 0x50
 119 #define PN533_CMD_IN_RELEASE 0x52
 120 #define PN533_CMD_IN_JUMP_FOR_DEP 0x56
 121
 122 #define PN533_CMD_TG_INIT_AS_TARGET 0x8c
 123 #define PN533_CMD_TG_GET_DATA 0x86
 124 #define PN533_CMD_TG_SET_DATA 0x8e
 125 #define PN533_CMD_UNDEF 0xff
 126
 127 #define PN533_CMD_RESPONSE(cmd) (cmd + 1)
 128
 129 /* PN533 Return codes */
 130 #define PN533_CMD_RET_MASK 0x3F
 131 #define PN533_CMD_MI_MASK 0x40
 132 #define PN533_CMD_RET_SUCCESS 0x00
 133
 134 struct pn533;
 135
 136 typedef int (*pn533_cmd_complete_t) (struct pn533 *dev, void *arg, int status);
 137
 138 typedef int (*pn533_send_async_complete_t) (struct pn533 *dev, void *arg,
 139                                         struct sk_buff *resp);
 140
 141 /* structs for pn533 commands */
 142
 143 /* PN533_CMD_GET_FIRMWARE_VERSION */
 144 struct pn533_fw_version {
 145         u8 ic;
 146         u8 ver;
 147         u8 rev;
 148         u8 support;
 149 };
 150
 151 /* PN533_CMD_RF_CONFIGURATION */
 152 #define PN533_CFGITEM_TIMING 0x02
 153 #define PN533_CFGITEM_MAX_RETRIES 0x05
 154 #define PN533_CFGITEM_PASORI 0x82
 155
 156 #define PN533_CONFIG_TIMING_102 0xb
 157 #define PN533_CONFIG_TIMING_204 0xc
 158 #define PN533_CONFIG_TIMING_409 0xd
 159 #define PN533_CONFIG_TIMING_819 0xe
 160
 161 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
 162 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
 163
 164 struct pn533_config_max_retries {
 165         u8 mx_rty_atr;
 166         u8 mx_rty_psl;
 167         u8 mx_rty_passive_act;
 168 } __packed;
 169
 170 struct pn533_config_timing {
 171         u8 rfu;
 172         u8 atr_res_timeout;
 173         u8 dep_timeout;
 174 } __packed;
 175
 176 /* PN533_CMD_IN_LIST_PASSIVE_TARGET */
 177
 178 /* felica commands opcode */
 179 #define PN533_FELICA_OPC_SENSF_REQ 0
 180 #define PN533_FELICA_OPC_SENSF_RES 1
 181 /* felica SENSF_REQ parameters */
 182 #define PN533_FELICA_SENSF_SC_ALL 0xFFFF
 183 #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
 184 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
 185 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
 186
 187 /* type B initiator_data values */
 188 #define PN533_TYPE_B_AFI_ALL_FAMILIES 0
 189 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
 190 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
 191
 192 union pn533_cmd_poll_initdata {
 193         struct {
 194                 u8 afi;
 195                 u8 polling_method;
 196         } __packed type_b;
 197         struct {
 198                 u8 opcode;
 199                 __be16 sc;
 200                 u8 rc;
 201                 u8 tsn;
 202         } __packed felica;
 203 };
 204
 205 /* Poll modulations */
 206 enum {
 207         PN533_POLL_MOD_106KBPS_A,
 208         PN533_POLL_MOD_212KBPS_FELICA,
 209         PN533_POLL_MOD_424KBPS_FELICA,
 210         PN533_POLL_MOD_106KBPS_JEWEL,
 211         PN533_POLL_MOD_847KBPS_B,
 212         PN533_LISTEN_MOD,
 213
 214         __PN533_POLL_MOD_AFTER_LAST,
 215 };
 216 #define PN533_POLL_MOD_MAX (__PN533_POLL_MOD_AFTER_LAST - 1)
 217
 218 struct pn533_poll_modulations {
 219         struct {
 220                 u8 maxtg;
 221                 u8 brty;
 222                 union pn533_cmd_poll_initdata initiator_data;
 223         } __packed data;
 224         u8 len;
 225 };
 226
 227 const struct pn533_poll_modulations poll_mod[] = {
 228         [PN533_POLL_MOD_106KBPS_A] = {
 229                 .data = {
 230                         .maxtg = 1,
 231                         .brty = 0,
 232                 },
 233                 .len = 2,
 234         },
 235         [PN533_POLL_MOD_212KBPS_FELICA] = {
 236                 .data = {
 237                         .maxtg = 1,
 238                         .brty = 1,
 239                         .initiator_data.felica = {
 240                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
 241                                 .sc = PN533_FELICA_SENSF_SC_ALL,
 242                                 .rc = PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE,
 243                                 .tsn = 0,
 244                         },
 245                 },
 246                 .len = 7,
 247         },
 248         [PN533_POLL_MOD_424KBPS_FELICA] = {
 249                 .data = {
 250                         .maxtg = 1,
 251                         .brty = 2,
 252                         .initiator_data.felica = {
 253                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
 254                                 .sc = PN533_FELICA_SENSF_SC_ALL,
 255                                 .rc = PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE,
 256                                 .tsn = 0,
 257                         },
 258                  },
 259                 .len = 7,
 260         },
 261         [PN533_POLL_MOD_106KBPS_JEWEL] = {
 262                 .data = {
 263                         .maxtg = 1,
 264                         .brty = 4,
 265                 },
 266                 .len = 2,
 267         },
 268         [PN533_POLL_MOD_847KBPS_B] = {
 269                 .data = {
 270                         .maxtg = 1,
 271                         .brty = 8,
 272                         .initiator_data.type_b = {
 273                                 .afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
 274                                 .polling_method =
 275                                         PN533_TYPE_B_POLL_METHOD_TIMESLOT,
 276                         },
 277                 },
 278                 .len = 3,
 279         },
 280         [PN533_LISTEN_MOD] = {
 281                 .len = 0,
 282         },
 283 };
 284
 285 /* PN533_CMD_IN_ATR */
 286
 287 struct pn533_cmd_activate_response {
 288         u8 status;
 289         u8 nfcid3t[10];
 290         u8 didt;
 291         u8 bst;
 292         u8 brt;
 293         u8 to;
 294         u8 ppt;
 295         /* optional */
 296         u8 gt[];
 297 } __packed;
 298
 299 struct pn533_cmd_jump_dep_response {
 300         u8 status;
 301         u8 tg;
 302         u8 nfcid3t[10];
 303         u8 didt;
 304         u8 bst;
 305         u8 brt;
 306         u8 to;
 307         u8 ppt;
 308         /* optional */
 309         u8 gt[];
 310 } __packed;
 311
 312
 313 /* PN533_TG_INIT_AS_TARGET */
 314 #define PN533_INIT_TARGET_PASSIVE 0x1
 315 #define PN533_INIT_TARGET_DEP 0x2
 316
 317 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
 318 #define PN533_INIT_TARGET_RESP_ACTIVE     0x1
 319 #define PN533_INIT_TARGET_RESP_DEP        0x4
 320
 321 struct pn533 {
 322         struct usb_device *udev;
 323         struct usb_interface *interface;
 324         struct nfc_dev *nfc_dev;
 325
 326         struct urb *out_urb;
 327         struct urb *in_urb;
 328
 329         struct sk_buff_head resp_q;
 330
 331         struct workqueue_struct *wq;
 332         struct work_struct cmd_work;
 333         struct work_struct cmd_complete_work;
 334         struct work_struct poll_work;
 335         struct work_struct mi_work;
 336         struct work_struct tg_work;
 337         struct timer_list listen_timer;
 338         struct pn533_frame *wq_in_frame;
 339         int wq_in_error;
 340         int cancel_listen;
 341
 342         pn533_cmd_complete_t cmd_complete;
 343         void *cmd_complete_arg;
 344         void *cmd_complete_mi_arg;
 345         struct mutex cmd_lock;
 346         u8 cmd;
 347
 348         struct pn533_poll_modulations *poll_mod_active[PN533_POLL_MOD_MAX + 1];
 349         u8 poll_mod_count;
 350         u8 poll_mod_curr;
 351         u32 poll_protocols;
 352         u32 listen_protocols;
 353
 354         u8 *gb;
 355         size_t gb_len;
 356
 357         u8 tgt_available_prots;
 358         u8 tgt_active_prot;
 359         u8 tgt_mode;
 360
 361         u32 device_type;
 362
 363         struct list_head cmd_queue;
 364         u8 cmd_pending;
 365 };
 366
 367 struct pn533_cmd {
 368         struct list_head queue;
 369         u8 cmd_code;
 370         struct sk_buff *req;
 371         struct sk_buff *resp;
 372         void *arg;
 373 };
 374
 375 struct pn533_frame {
 376         u8 preamble;
 377         __be16 start_frame;
 378         u8 datalen;
 379         u8 datalen_checksum;
 380         u8 data[];
 381 } __packed;
 382
 383 /* The rule: value + checksum = 0 */
 384 static inline u8 pn533_checksum(u8 value)
 385 {
 386         return ~value + 1;
 387 }
 388
 389 /* The rule: sum(data elements) + checksum = 0 */
 390 static u8 pn533_data_checksum(u8 *data, int datalen)
 391 {
 392         u8 sum = 0;
 393         int i;
 394
 395         for (i = 0; i < datalen; i++)
 396                 sum += data[i];
 397
 398         return pn533_checksum(sum);
 399 }
 400
 401 static void pn533_tx_frame_init(struct pn533_frame *frame, u8 cmd)
 402 {
 403         frame->preamble = 0;
 404         frame->start_frame = cpu_to_be16(PN533_SOF);
 405         PN533_FRAME_IDENTIFIER(frame) = PN533_DIR_OUT;
 406         PN533_FRAME_CMD(frame) = cmd;
 407         frame->datalen = 2;
 408 }
 409
 410 static void pn533_tx_frame_finish(struct pn533_frame *frame)
 411 {
 412         frame->datalen_checksum = pn533_checksum(frame->datalen);
 413
 414         PN533_FRAME_CHECKSUM(frame) =
 415                 pn533_data_checksum(frame->data, frame->datalen);
 416
 417         PN533_FRAME_POSTAMBLE(frame) = 0;
 418 }
 419
 420 static bool pn533_rx_frame_is_valid(struct pn533_frame *frame)
 421 {
 422         u8 checksum;
 423
 424         if (frame->start_frame != cpu_to_be16(PN533_SOF))
 425                 return false;
 426
 427         checksum = pn533_checksum(frame->datalen);
 428         if (checksum != frame->datalen_checksum)
 429                 return false;
 430
 431         checksum = pn533_data_checksum(frame->data, frame->datalen);
 432         if (checksum != PN533_FRAME_CHECKSUM(frame))
 433                 return false;
 434
 435         return true;
 436 }
 437
 438 static bool pn533_rx_frame_is_ack(struct pn533_frame *frame)
 439 {
 440         if (frame->start_frame != cpu_to_be16(PN533_SOF))
 441                 return false;
 442
 443         if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
 444                 return false;
 445
 446         return true;
 447 }
 448
 449 static bool pn533_rx_frame_is_cmd_response(struct pn533_frame *frame, u8 cmd)
 450 {
 451         return (PN533_FRAME_CMD(frame) == PN533_CMD_RESPONSE(cmd));
 452 }
 453
 454
 455 static void pn533_wq_cmd_complete(struct work_struct *work)
 456 {
 457         struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
 458         int rc;
 459
 460         rc = dev->cmd_complete(dev, dev->cmd_complete_arg, dev->wq_in_error);
 461         if (rc != -EINPROGRESS)
 462                 queue_work(dev->wq, &dev->cmd_work);
 463 }
 464
 465 static void pn533_recv_response(struct urb *urb)
 466 {
 467         struct pn533 *dev = urb->context;
 468         struct pn533_frame *in_frame;
 469
 470         dev->wq_in_frame = NULL;
 471
 472         switch (urb->status) {
 473         case 0:
 474                 break; /* success */
 475         case -ECONNRESET:
 476         case -ENOENT:
 477                 nfc_dev_dbg(&dev->interface->dev,
 478                             "The urb has been canceled (status %d)",
 479                             urb->status);
 480                 dev->wq_in_error = urb->status;
 481                 goto sched_wq;
 482                 break;
 483         case -ESHUTDOWN:
 484         default:
 485                 nfc_dev_err(&dev->interface->dev,
 486                             "Urb failure (status %d)", urb->status);
 487                 dev->wq_in_error = urb->status;
 488                 goto sched_wq;
 489         }
 490
 491         in_frame = dev->in_urb->transfer_buffer;
 492
 493         nfc_dev_dbg(&dev->interface->dev, "Received a frame.");
 494         print_hex_dump(KERN_DEBUG, "PN533 RX: ", DUMP_PREFIX_NONE, 16, 1,
 495                        in_frame, PN533_FRAME_SIZE(in_frame), false);
 496
 497         if (!pn533_rx_frame_is_valid(in_frame)) {
 498                 nfc_dev_err(&dev->interface->dev, "Received an invalid frame");
 499                 dev->wq_in_error = -EIO;
 500                 goto sched_wq;
 501         }
 502
 503         if (!pn533_rx_frame_is_cmd_response(in_frame, dev->cmd)) {
 504                 nfc_dev_err(&dev->interface->dev,
 505                             "It it not the response to the last command");
 506                 dev->wq_in_error = -EIO;
 507                 goto sched_wq;
 508         }
 509
 510         dev->wq_in_error = 0;
 511         dev->wq_in_frame = in_frame;
 512
 513 sched_wq:
 514         queue_work(dev->wq, &dev->cmd_complete_work);
 515 }
 516
 517 static int pn533_submit_urb_for_response(struct pn533 *dev, gfp_t flags)
 518 {
 519         dev->in_urb->complete = pn533_recv_response;
 520
 521         return usb_submit_urb(dev->in_urb, flags);
 522 }
 523
 524 static void pn533_recv_ack(struct urb *urb)
 525 {
 526         struct pn533 *dev = urb->context;
 527         struct pn533_frame *in_frame;
 528         int rc;
 529
 530         switch (urb->status) {
 531         case 0:
 532                 break; /* success */
 533         case -ECONNRESET:
 534         case -ENOENT:
 535                 nfc_dev_dbg(&dev->interface->dev,
 536                             "The urb has been stopped (status %d)",
 537                             urb->status);
 538                 dev->wq_in_error = urb->status;
 539                 goto sched_wq;
 540                 break;
 541         case -ESHUTDOWN:
 542         default:
 543                 nfc_dev_err(&dev->interface->dev,
 544                             "Urb failure (status %d)", urb->status);
 545                 dev->wq_in_error = urb->status;
 546                 goto sched_wq;
 547         }
 548
 549         in_frame = dev->in_urb->transfer_buffer;
 550
 551         if (!pn533_rx_frame_is_ack(in_frame)) {
 552                 nfc_dev_err(&dev->interface->dev, "Received an invalid ack");
 553                 dev->wq_in_error = -EIO;
 554                 goto sched_wq;
 555         }
 556
 557         rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
 558         if (rc) {
 559                 nfc_dev_err(&dev->interface->dev,
 560                             "usb_submit_urb failed with result %d", rc);
 561                 dev->wq_in_error = rc;
 562                 goto sched_wq;
 563         }
 564
 565         return;
 566
 567 sched_wq:
 568         dev->wq_in_frame = NULL;
 569         queue_work(dev->wq, &dev->cmd_complete_work);
 570 }
 571
 572 static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags)
 573 {
 574         dev->in_urb->complete = pn533_recv_ack;
 575
 576         return usb_submit_urb(dev->in_urb, flags);
 577 }
 578
 579 static int pn533_send_ack(struct pn533 *dev, gfp_t flags)
 580 {
 581         u8 ack[PN533_FRAME_ACK_SIZE] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
 582         /* spec 7.1.1.3:  Preamble, SoPC (2), ACK Code (2), Postamble */
 583         int rc;
 584
 585         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
 586
 587         dev->out_urb->transfer_buffer = ack;
 588         dev->out_urb->transfer_buffer_length = sizeof(ack);
 589         rc = usb_submit_urb(dev->out_urb, flags);
 590
 591         return rc;
 592 }
 593
 594 static int __pn533_send_frame_async(struct pn533 *dev,
 595                                         struct sk_buff *out,
 596                                         struct sk_buff *in,
 597                                         int in_len,
 598                                         pn533_cmd_complete_t cmd_complete,
 599                                         void *arg)
 600 {
 601         int rc;
 602
 603         dev->cmd = PN533_FRAME_CMD(((struct pn533_frame *)out->data));
 604         dev->cmd_complete = cmd_complete;
 605         dev->cmd_complete_arg = arg;
 606
 607         dev->out_urb->transfer_buffer = out->data;
 608         dev->out_urb->transfer_buffer_length = out->len;
 609
 610         dev->in_urb->transfer_buffer = in->data;
 611         dev->in_urb->transfer_buffer_length = in_len;
 612
 613         print_hex_dump(KERN_DEBUG, "PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
 614                        out->data, out->len, false);
 615
 616         rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
 617         if (rc)
 618                 return rc;
 619
 620         rc = pn533_submit_urb_for_ack(dev, GFP_KERNEL);
 621         if (rc)
 622                 goto error;
 623
 624         return 0;
 625
 626 error:
 627         usb_unlink_urb(dev->out_urb);
 628         return rc;
 629 }
 630
 631 static void pn533_build_cmd_frame(u8 cmd_code, struct sk_buff *skb)
 632 {
 633         struct pn533_frame *frame;
 634         /* payload is already there, just update datalen */
 635         int payload_len = skb->len;
 636
 637         skb_push(skb, PN533_FRAME_HEADER_LEN);
 638         skb_put(skb, PN533_FRAME_TAIL_LEN);
 639
 640         frame = (struct pn533_frame *)skb->data;
 641
 642         pn533_tx_frame_init(frame, cmd_code);
 643         frame->datalen += payload_len;
 644         pn533_tx_frame_finish(frame);
 645 }
 646
 647 struct pn533_send_async_complete_arg {
 648         pn533_send_async_complete_t  complete_cb;
 649         void *complete_cb_context;
 650         struct sk_buff *resp;
 651         struct sk_buff *req;
 652 };
 653
 654 static int pn533_send_async_complete(struct pn533 *dev, void *_arg, int status)
 655 {
 656         struct pn533_send_async_complete_arg *arg = _arg;
 657
 658         struct sk_buff *req = arg->req;
 659         struct sk_buff *resp = arg->resp;
 660
 661         struct pn533_frame *frame = (struct pn533_frame *)resp->data;
 662         int rc;
 663
 664         dev_kfree_skb(req);
 665
 666         if (status < 0) {
 667                 arg->complete_cb(dev, arg->complete_cb_context,
 668                                  ERR_PTR(status));
 669                 dev_kfree_skb(resp);
 670                 kfree(arg);
 671                 return status;
 672         }
 673
 674         skb_put(resp, PN533_FRAME_SIZE(frame));
 675         skb_pull(resp, PN533_FRAME_HEADER_LEN);
 676         skb_trim(resp, resp->len - PN533_FRAME_TAIL_LEN);
 677
 678         rc = arg->complete_cb(dev, arg->complete_cb_context, resp);
 679
 680         kfree(arg);
 681         return rc;
 682 }
 683
 684 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
 685                               struct sk_buff *req, struct sk_buff *resp,
 686                               int resp_len,
 687                               pn533_send_async_complete_t complete_cb,
 688                               void *complete_cb_context)
 689 {
 690         struct pn533_cmd *cmd;
 691         struct pn533_send_async_complete_arg *arg;
 692         int rc = 0;
 693
 694         nfc_dev_dbg(&dev->interface->dev, "Sending command 0x%x", cmd_code);
 695
 696         arg = kzalloc(sizeof(arg), GFP_KERNEL);
 697         if (!arg)
 698                 return -ENOMEM;
 699
 700         arg->complete_cb = complete_cb;
 701         arg->complete_cb_context = complete_cb_context;
 702         arg->resp = resp;
 703         arg->req = req;
 704
 705         pn533_build_cmd_frame(cmd_code, req);
 706
 707         mutex_lock(&dev->cmd_lock);
 708
 709         if (!dev->cmd_pending) {
 710                 rc = __pn533_send_frame_async(dev, req, resp, resp_len,
 711                                               pn533_send_async_complete, arg);
 712                 if (rc)
 713                         goto error;
 714
 715                 dev->cmd_pending = 1;
 716                 goto unlock;
 717         }
 718
 719         nfc_dev_dbg(&dev->interface->dev, "%s Queueing command 0x%x", __func__,
 720                     cmd_code);
 721
 722         cmd = kzalloc(sizeof(struct pn533_cmd), GFP_KERNEL);
 723         if (!cmd) {
 724                 rc = -ENOMEM;
 725                 goto error;
 726         }
 727
 728         INIT_LIST_HEAD(&cmd->queue);
 729         cmd->cmd_code = cmd_code;
 730         cmd->req = req;
 731         cmd->resp = resp;
 732         cmd->arg = arg;
 733
 734         list_add_tail(&cmd->queue, &dev->cmd_queue);
 735
 736         goto unlock;
 737
 738 error:
 739         kfree(arg);
 740 unlock:
 741         mutex_unlock(&dev->cmd_lock);
 742         return rc;
 743 }
 744
 745 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
 746                                  struct sk_buff *req,
 747                                  pn533_send_async_complete_t complete_cb,
 748                                  void *complete_cb_context)
 749 {
 750         struct sk_buff *resp;
 751         int rc;
 752         int  resp_len = PN533_FRAME_HEADER_LEN +
 753                         PN533_FRAME_MAX_PAYLOAD_LEN +
 754                         PN533_FRAME_TAIL_LEN;
 755
 756         resp = nfc_alloc_recv_skb(resp_len, GFP_KERNEL);
 757         if (!resp)
 758                 return -ENOMEM;
 759
 760         rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
 761                                 complete_cb_context);
 762         if (rc)
 763                 dev_kfree_skb(resp);
 764
 765         return rc;
 766 }
 767
 768 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
 769                                 struct sk_buff *req,
 770                                 pn533_send_async_complete_t complete_cb,
 771                                 void *complete_cb_context)
 772 {
 773         struct sk_buff *resp;
 774         int rc;
 775
 776         resp = alloc_skb(PN533_NORMAL_FRAME_MAX_LEN, GFP_KERNEL);
 777         if (!resp)
 778                 return -ENOMEM;
 779
 780         rc = __pn533_send_async(dev, cmd_code, req, resp,
 781                                 PN533_NORMAL_FRAME_MAX_LEN,
 782                                 complete_cb, complete_cb_context);
 783         if (rc)
 784                 dev_kfree_skb(resp);
 785
 786         return rc;
 787 }
 788
 789 /*
 790  * pn533_send_cmd_direct_async
 791  *
 792  * The function sends a piority cmd directly to the chip omiting the cmd
 793  * queue. It's intended to be used by chaining mechanism of received responses
 794  * where the host has to request every single chunk of data before scheduling
 795  * next cmd from the queue.
 796  */
 797 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
 798                                        struct sk_buff *req,
 799                                        pn533_send_async_complete_t complete_cb,
 800                                        void *complete_cb_context)
 801 {
 802         struct pn533_send_async_complete_arg *arg;
 803         struct sk_buff *resp;
 804         int rc;
 805         int resp_len = PN533_FRAME_HEADER_LEN +
 806                        PN533_FRAME_MAX_PAYLOAD_LEN +
 807                        PN533_FRAME_TAIL_LEN;
 808
 809         resp = alloc_skb(resp_len, GFP_KERNEL);
 810         if (!resp)
 811                 return -ENOMEM;
 812
 813         arg = kzalloc(sizeof(arg), GFP_KERNEL);
 814         if (!arg) {
 815                 dev_kfree_skb(resp);
 816                 return -ENOMEM;
 817         }
 818
 819         arg->complete_cb = complete_cb;
 820         arg->complete_cb_context = complete_cb_context;
 821         arg->resp = resp;
 822         arg->req = req;
 823
 824         pn533_build_cmd_frame(cmd_code, req);
 825
 826         rc = __pn533_send_frame_async(dev, req, resp, resp_len,
 827                                       pn533_send_async_complete, arg);
 828         if (rc < 0) {
 829                 dev_kfree_skb(resp);
 830                 kfree(arg);
 831         }
 832
 833         return rc;
 834 }
 835
 836 static void pn533_wq_cmd(struct work_struct *work)
 837 {
 838         struct pn533 *dev = container_of(work, struct pn533, cmd_work);
 839         struct pn533_cmd *cmd;
 840
 841         mutex_lock(&dev->cmd_lock);
 842
 843         if (list_empty(&dev->cmd_queue)) {
 844                 dev->cmd_pending = 0;
 845                 mutex_unlock(&dev->cmd_lock);
 846                 return;
 847         }
 848
 849         cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
 850
 851         list_del(&cmd->queue);
 852
 853         mutex_unlock(&dev->cmd_lock);
 854
 855         __pn533_send_frame_async(dev, cmd->req, cmd->resp,
 856                                  PN533_NORMAL_FRAME_MAX_LEN,
 857                                  pn533_send_async_complete,
 858                                  cmd->arg);
 859
 860         kfree(cmd);
 861 }
 862
 863 struct pn533_sync_cmd_response {
 864         struct sk_buff *resp;
 865         struct completion done;
 866 };
 867
 868 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
 869                                     struct sk_buff *resp)
 870 {
 871         struct pn533_sync_cmd_response *arg = _arg;
 872
 873         arg->resp = resp;
 874         complete(&arg->done);
 875
 876         return 0;
 877 }
 878
 879 /*  pn533_send_cmd_sync
 880  *
 881  *  Please note the req parameter is freed inside the function to
 882  *  limit a number of return value interpretations by the caller.
 883  *
 884  *  1. negative in case of error during TX path -> req should be freed
 885  *
 886  *  2. negative in case of error during RX path -> req should not be freed
 887  *     as it's been already freed at the begining of RX path by
 888  *     async_complete_cb.
 889  *
 890  *  3. valid pointer in case of succesfult RX path
 891  *
 892  *  A caller has to check a return value with IS_ERR macro. If the test pass,
 893  *  the returned pointer is valid.
 894  *
 895  * */
 896 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
 897                                                struct sk_buff *req)
 898 {
 899         int rc;
 900         struct pn533_sync_cmd_response arg;
 901
 902         init_completion(&arg.done);
 903
 904         rc = pn533_send_cmd_async(dev, cmd_code, req,
 905                                   pn533_send_sync_complete, &arg);
 906         if (rc) {
 907                 dev_kfree_skb(req);
 908                 return ERR_PTR(rc);
 909         }
 910
 911         wait_for_completion(&arg.done);
 912
 913         return arg.resp;
 914 }
 915
 916 static void pn533_send_complete(struct urb *urb)
 917 {
 918         struct pn533 *dev = urb->context;
 919
 920         switch (urb->status) {
 921         case 0:
 922                 break; /* success */
 923         case -ECONNRESET:
 924         case -ENOENT:
 925                 nfc_dev_dbg(&dev->interface->dev,
 926                             "The urb has been stopped (status %d)",
 927                             urb->status);
 928                 break;
 929         case -ESHUTDOWN:
 930         default:
 931                 nfc_dev_err(&dev->interface->dev,
 932                             "Urb failure (status %d)", urb->status);
 933         }
 934 }
 935
 936 static struct sk_buff *pn533_alloc_skb(unsigned int size)
 937 {
 938         struct sk_buff *skb;
 939
 940         skb = alloc_skb(PN533_FRAME_HEADER_LEN +
 941                         size +
 942                         PN533_FRAME_TAIL_LEN, GFP_KERNEL);
 943
 944         if (skb)
 945                 skb_reserve(skb, PN533_FRAME_HEADER_LEN);
 946
 947         return skb;
 948 }
 949
 950 struct pn533_target_type_a {
 951         __be16 sens_res;
 952         u8 sel_res;
 953         u8 nfcid_len;
 954         u8 nfcid_data[];
 955 } __packed;
 956
 957
 958 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
 959 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
 960 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
 961
 962 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
 963 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
 964
 965 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
 966 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
 967
 968 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
 969 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
 970 #define PN533_TYPE_A_SEL_PROT_DEP 2
 971 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
 972
 973 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
 974                                                         int target_data_len)
 975 {
 976         u8 ssd;
 977         u8 platconf;
 978
 979         if (target_data_len < sizeof(struct pn533_target_type_a))
 980                 return false;
 981
 982         /* The lenght check of nfcid[] and ats[] are not being performed because
 983            the values are not being used */
 984
 985         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
 986         ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
 987         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
 988
 989         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 990              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
 991             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 992              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
 993                 return false;
 994
 995         /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
 996         if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
 997                 return false;
 998
 999         return true;
1000 }
1001
1002 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
1003                                                         int tgt_data_len)
1004 {
1005         struct pn533_target_type_a *tgt_type_a;
1006
1007         tgt_type_a = (struct pn533_target_type_a *)tgt_data;
1008
1009         if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
1010                 return -EPROTO;
1011
1012         switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
1013         case PN533_TYPE_A_SEL_PROT_MIFARE:
1014                 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
1015                 break;
1016         case PN533_TYPE_A_SEL_PROT_ISO14443:
1017                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
1018                 break;
1019         case PN533_TYPE_A_SEL_PROT_DEP:
1020                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1021                 break;
1022         case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
1023                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
1024                                                         NFC_PROTO_NFC_DEP_MASK;
1025                 break;
1026         }
1027
1028         nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
1029         nfc_tgt->sel_res = tgt_type_a->sel_res;
1030         nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
1031         memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
1032
1033         return 0;
1034 }
1035
1036 struct pn533_target_felica {
1037         u8 pol_res;
1038         u8 opcode;
1039         u8 nfcid2[8];
1040         u8 pad[8];
1041         /* optional */
1042         u8 syst_code[];
1043 } __packed;
1044
1045 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
1046 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
1047
1048 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
1049                                                         int target_data_len)
1050 {
1051         if (target_data_len < sizeof(struct pn533_target_felica))
1052                 return false;
1053
1054         if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
1055                 return false;
1056
1057         return true;
1058 }
1059
1060 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
1061                                                         int tgt_data_len)
1062 {
1063         struct pn533_target_felica *tgt_felica;
1064
1065         tgt_felica = (struct pn533_target_felica *)tgt_data;
1066
1067         if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
1068                 return -EPROTO;
1069
1070         if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
1071             (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
1072                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1073         else
1074                 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
1075
1076         memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
1077         nfc_tgt->sensf_res_len = 9;
1078
1079         return 0;
1080 }
1081
1082 struct pn533_target_jewel {
1083         __be16 sens_res;
1084         u8 jewelid[4];
1085 } __packed;
1086
1087 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
1088                                                         int target_data_len)
1089 {
1090         u8 ssd;
1091         u8 platconf;
1092
1093         if (target_data_len < sizeof(struct pn533_target_jewel))
1094                 return false;
1095
1096         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1097         ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
1098         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
1099
1100         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1101              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1102             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1103              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1104                 return false;
1105
1106         return true;
1107 }
1108
1109 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
1110                                                         int tgt_data_len)
1111 {
1112         struct pn533_target_jewel *tgt_jewel;
1113
1114         tgt_jewel = (struct pn533_target_jewel *)tgt_data;
1115
1116         if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
1117                 return -EPROTO;
1118
1119         nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
1120         nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
1121         nfc_tgt->nfcid1_len = 4;
1122         memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
1123
1124         return 0;
1125 }
1126
1127 struct pn533_type_b_prot_info {
1128         u8 bitrate;
1129         u8 fsci_type;
1130         u8 fwi_adc_fo;
1131 } __packed;
1132
1133 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
1134 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
1135 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
1136
1137 struct pn533_type_b_sens_res {
1138         u8 opcode;
1139         u8 nfcid[4];
1140         u8 appdata[4];
1141         struct pn533_type_b_prot_info prot_info;
1142 } __packed;
1143
1144 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
1145
1146 struct pn533_target_type_b {
1147         struct pn533_type_b_sens_res sensb_res;
1148         u8 attrib_res_len;
1149         u8 attrib_res[];
1150 } __packed;
1151
1152 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
1153                                                         int target_data_len)
1154 {
1155         if (target_data_len < sizeof(struct pn533_target_type_b))
1156                 return false;
1157
1158         if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
1159                 return false;
1160
1161         if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
1162                                                 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
1163                 return false;
1164
1165         return true;
1166 }
1167
1168 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
1169                                                         int tgt_data_len)
1170 {
1171         struct pn533_target_type_b *tgt_type_b;
1172
1173         tgt_type_b = (struct pn533_target_type_b *)tgt_data;
1174
1175         if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
1176                 return -EPROTO;
1177
1178         nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
1179
1180         return 0;
1181 }
1182
1183 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
1184                               int tgdata_len)
1185 {
1186         struct nfc_target nfc_tgt;
1187         int rc;
1188
1189         nfc_dev_dbg(&dev->interface->dev, "%s - modulation=%d", __func__,
1190                     dev->poll_mod_curr);
1191
1192         if (tg != 1)
1193                 return -EPROTO;
1194
1195         memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1196
1197         switch (dev->poll_mod_curr) {
1198         case PN533_POLL_MOD_106KBPS_A:
1199                 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
1200                 break;
1201         case PN533_POLL_MOD_212KBPS_FELICA:
1202         case PN533_POLL_MOD_424KBPS_FELICA:
1203                 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
1204                 break;
1205         case PN533_POLL_MOD_106KBPS_JEWEL:
1206                 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
1207                 break;
1208         case PN533_POLL_MOD_847KBPS_B:
1209                 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
1210                 break;
1211         default:
1212                 nfc_dev_err(&dev->interface->dev,
1213                             "Unknown current poll modulation");
1214                 return -EPROTO;
1215         }
1216
1217         if (rc)
1218                 return rc;
1219
1220         if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1221                 nfc_dev_dbg(&dev->interface->dev,
1222                             "The Tg found doesn't have the desired protocol");
1223                 return -EAGAIN;
1224         }
1225
1226         nfc_dev_dbg(&dev->interface->dev,
1227                     "Target found - supported protocols: 0x%x",
1228                     nfc_tgt.supported_protocols);
1229
1230         dev->tgt_available_prots = nfc_tgt.supported_protocols;
1231
1232         nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1233
1234         return 0;
1235 }
1236
1237 static inline void pn533_poll_next_mod(struct pn533 *dev)
1238 {
1239         dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
1240 }
1241
1242 static void pn533_poll_reset_mod_list(struct pn533 *dev)
1243 {
1244         dev->poll_mod_count = 0;
1245 }
1246
1247 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
1248 {
1249         dev->poll_mod_active[dev->poll_mod_count] =
1250                 (struct pn533_poll_modulations *)&poll_mod[mod_index];
1251         dev->poll_mod_count++;
1252 }
1253
1254 static void pn533_poll_create_mod_list(struct pn533 *dev,
1255                                        u32 im_protocols, u32 tm_protocols)
1256 {
1257         pn533_poll_reset_mod_list(dev);
1258
1259         if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
1260             (im_protocols & NFC_PROTO_ISO14443_MASK) ||
1261             (im_protocols & NFC_PROTO_NFC_DEP_MASK))
1262                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
1263
1264         if (im_protocols & NFC_PROTO_FELICA_MASK ||
1265             im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1266                 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
1267                 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
1268         }
1269
1270         if (im_protocols & NFC_PROTO_JEWEL_MASK)
1271                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
1272
1273         if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1274                 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
1275
1276         if (tm_protocols)
1277                 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
1278 }
1279
1280 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
1281 {
1282         u8 nbtg, tg, *tgdata;
1283         int rc, tgdata_len;
1284
1285         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1286
1287         nbtg = resp->data[0];
1288         tg = resp->data[1];
1289         tgdata = &resp->data[2];
1290         tgdata_len = resp->len - 2;  /* nbtg + tg */
1291
1292         if (nbtg) {
1293                 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1294
1295                 /* We must stop the poll after a valid target found */
1296                 if (rc == 0) {
1297                         pn533_poll_reset_mod_list(dev);
1298                         return 0;
1299                 }
1300         }
1301
1302         return -EAGAIN;
1303 }
1304
1305 static struct sk_buff *pn533_alloc_poll_tg_frame(u8 *gbytes, size_t gbytes_len)
1306 {
1307         struct sk_buff *skb;
1308         u8 *felica, *nfcid3, *gb;
1309
1310         u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1311                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1312                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1313                                 0xff, 0xff}; /* System code */
1314
1315         u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1316                                0x0, 0x0, 0x0,
1317                                0x40}; /* SEL_RES for DEP */
1318
1319         unsigned int skb_len = 36 + /* mode (1), mifare (6),
1320                                        felica (18), nfcid3 (10), gb_len (1) */
1321                                gbytes_len +
1322                                1;  /* len Tk*/
1323
1324         skb = pn533_alloc_skb(skb_len);
1325         if (!skb)
1326                 return NULL;
1327
1328         /* DEP support only */
1329         *skb_put(skb, 1) |= PN533_INIT_TARGET_DEP;
1330
1331         /* MIFARE params */
1332         memcpy(skb_put(skb, 6), mifare_params, 6);
1333
1334         /* Felica params */
1335         felica = skb_put(skb, 18);
1336         memcpy(felica, felica_params, 18);
1337         get_random_bytes(felica + 2, 6);
1338
1339         /* NFCID3 */
1340         nfcid3 = skb_put(skb, 10);
1341         memset(nfcid3, 0, 10);
1342         memcpy(nfcid3, felica, 8);
1343
1344         /* General bytes */
1345         *skb_put(skb, 1) = gbytes_len;
1346
1347         gb = skb_put(skb, gbytes_len);
1348         memcpy(gb, gbytes, gbytes_len);
1349
1350         /* Len Tk */
1351         *skb_put(skb, 1) = 0;
1352
1353         return skb;
1354 }
1355
1356 #define PN533_CMD_DATAEXCH_HEAD_LEN 1
1357 #define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
1358 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1359                                       struct sk_buff *resp)
1360 {
1361         u8 status;
1362
1363         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1364
1365         if (IS_ERR(resp))
1366                 return PTR_ERR(resp);
1367
1368         status = resp->data[0];
1369         skb_pull(resp, sizeof(status));
1370
1371         if (status != 0) {
1372                 nfc_tm_deactivated(dev->nfc_dev);
1373                 dev->tgt_mode = 0;
1374                 dev_kfree_skb(resp);
1375                 return 0;
1376         }
1377
1378         return nfc_tm_data_received(dev->nfc_dev, resp);
1379 }
1380
1381 static void pn533_wq_tg_get_data(struct work_struct *work)
1382 {
1383         struct pn533 *dev = container_of(work, struct pn533, tg_work);
1384
1385         struct sk_buff *skb;
1386         int rc;
1387
1388         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1389
1390         skb = pn533_alloc_skb(0);
1391         if (!skb)
1392                 return;
1393
1394         rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1395                                    pn533_tm_get_data_complete, NULL);
1396
1397         if (rc < 0)
1398                 dev_kfree_skb(skb);
1399
1400         return;
1401 }
1402
1403 #define ATR_REQ_GB_OFFSET 17
1404 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1405 {
1406         u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1407         size_t gb_len;
1408         int rc;
1409
1410         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1411
1412         if (resp->len < ATR_REQ_GB_OFFSET + 1)
1413                 return -EINVAL;
1414
1415         mode = resp->data[0];
1416         cmd = &resp->data[1];
1417
1418         nfc_dev_dbg(&dev->interface->dev, "Target mode 0x%x len %d\n",
1419                     mode, resp->len);
1420
1421         if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1422             PN533_INIT_TARGET_RESP_ACTIVE)
1423                 comm_mode = NFC_COMM_ACTIVE;
1424
1425         if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0)  /* Only DEP supported */
1426                 return -EOPNOTSUPP;
1427
1428         gb = cmd + ATR_REQ_GB_OFFSET;
1429         gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1430
1431         rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1432                               comm_mode, gb, gb_len);
1433         if (rc < 0) {
1434                 nfc_dev_err(&dev->interface->dev,
1435                             "Error when signaling target activation");
1436                 return rc;
1437         }
1438
1439         dev->tgt_mode = 1;
1440         queue_work(dev->wq, &dev->tg_work);
1441
1442         return 0;
1443 }
1444
1445 static void pn533_listen_mode_timer(unsigned long data)
1446 {
1447         struct pn533 *dev = (struct pn533 *)data;
1448
1449         nfc_dev_dbg(&dev->interface->dev, "Listen mode timeout");
1450
1451         /* An ack will cancel the last issued command (poll) */
1452         pn533_send_ack(dev, GFP_ATOMIC);
1453
1454         dev->cancel_listen = 1;
1455
1456         pn533_poll_next_mod(dev);
1457
1458         queue_work(dev->wq, &dev->poll_work);
1459 }
1460
1461 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1462                                struct sk_buff *resp)
1463 {
1464         struct pn533_poll_modulations *cur_mod;
1465         int rc;
1466
1467         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1468
1469         if (IS_ERR(resp)) {
1470                 rc = PTR_ERR(resp);
1471
1472                 nfc_dev_err(&dev->interface->dev, "%s  Poll complete error %d",
1473                             __func__, rc);
1474
1475                 if (rc == -ENOENT) {
1476                         if (dev->poll_mod_count != 0)
1477                                 return rc;
1478                         else
1479                                 goto stop_poll;
1480                 } else if (rc < 0) {
1481                         nfc_dev_err(&dev->interface->dev,
1482                                     "Error %d when running poll", rc);
1483                         goto stop_poll;
1484                 }
1485         }
1486
1487         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1488
1489         if (cur_mod->len == 0) { /* Target mode */
1490                 del_timer(&dev->listen_timer);
1491                 rc = pn533_init_target_complete(dev, resp);
1492                 goto done;
1493         }
1494
1495         /* Initiator mode */
1496         rc = pn533_start_poll_complete(dev, resp);
1497         if (!rc)
1498                 goto done;
1499
1500         pn533_poll_next_mod(dev);
1501         queue_work(dev->wq, &dev->poll_work);
1502
1503 done:
1504         dev_kfree_skb(resp);
1505         return rc;
1506
1507 stop_poll:
1508         nfc_dev_err(&dev->interface->dev, "Polling operation has been stopped");
1509
1510         pn533_poll_reset_mod_list(dev);
1511         dev->poll_protocols = 0;
1512         return rc;
1513 }
1514
1515 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533_poll_modulations
1516                                                  *mod)
1517 {
1518         struct sk_buff *skb;
1519
1520         skb = pn533_alloc_skb(mod->len);
1521         if (!skb)
1522                 return NULL;
1523
1524         memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
1525
1526         return skb;
1527 }
1528
1529 static int pn533_send_poll_frame(struct pn533 *dev)
1530 {
1531         struct pn533_poll_modulations *mod;
1532         struct sk_buff *skb;
1533         int rc;
1534         u8 cmd_code;
1535
1536         mod = dev->poll_mod_active[dev->poll_mod_curr];
1537
1538         nfc_dev_dbg(&dev->interface->dev, "%s mod len %d\n",
1539                     __func__, mod->len);
1540
1541         if (mod->len == 0) {  /* Listen mode */
1542                 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1543                 skb = pn533_alloc_poll_tg_frame(dev->gb, dev->gb_len);
1544         } else {  /* Polling mode */
1545                 cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
1546                 skb = pn533_alloc_poll_in_frame(mod);
1547         }
1548
1549         if (!skb) {
1550                 nfc_dev_err(&dev->interface->dev, "Failed to allocate skb.");
1551                 return -ENOMEM;
1552         }
1553
1554         rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1555                                   NULL);
1556         if (rc < 0) {
1557                 dev_kfree_skb(skb);
1558                 nfc_dev_err(&dev->interface->dev, "Polling loop error %d", rc);
1559         }
1560
1561         return rc;
1562 }
1563
1564 static void pn533_wq_poll(struct work_struct *work)
1565 {
1566         struct pn533 *dev = container_of(work, struct pn533, poll_work);
1567         struct pn533_poll_modulations *cur_mod;
1568         int rc;
1569
1570         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1571
1572         nfc_dev_dbg(&dev->interface->dev,
1573                     "%s cancel_listen %d modulation len %d",
1574                     __func__, dev->cancel_listen, cur_mod->len);
1575
1576         if (dev->cancel_listen == 1) {
1577                 dev->cancel_listen = 0;
1578                 usb_kill_urb(dev->in_urb);
1579         }
1580
1581         rc = pn533_send_poll_frame(dev);
1582         if (rc)
1583                 return;
1584
1585         if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1586                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1587
1588         return;
1589 }
1590
1591 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1592                             u32 im_protocols, u32 tm_protocols)
1593 {
1594         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1595
1596         nfc_dev_dbg(&dev->interface->dev,
1597                     "%s: im protocols 0x%x tm protocols 0x%x",
1598                     __func__, im_protocols, tm_protocols);
1599
1600         if (dev->tgt_active_prot) {
1601                 nfc_dev_err(&dev->interface->dev,
1602                             "Cannot poll with a target already activated");
1603                 return -EBUSY;
1604         }
1605
1606         if (dev->tgt_mode) {
1607                 nfc_dev_err(&dev->interface->dev,
1608                             "Cannot poll while already being activated");
1609                 return -EBUSY;
1610         }
1611
1612         if (tm_protocols) {
1613                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1614                 if (dev->gb == NULL)
1615                         tm_protocols = 0;
1616         }
1617
1618         dev->poll_mod_curr = 0;
1619         pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1620         dev->poll_protocols = im_protocols;
1621         dev->listen_protocols = tm_protocols;
1622
1623         return pn533_send_poll_frame(dev);
1624 }
1625
1626 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1627 {
1628         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1629
1630         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1631
1632         del_timer(&dev->listen_timer);
1633
1634         if (!dev->poll_mod_count) {
1635                 nfc_dev_dbg(&dev->interface->dev,
1636                             "Polling operation was not running");
1637                 return;
1638         }
1639
1640         /* An ack will cancel the last issued command (poll) */
1641         pn533_send_ack(dev, GFP_KERNEL);
1642
1643         /* prevent pn533_start_poll_complete to issue a new poll meanwhile */
1644         usb_kill_urb(dev->in_urb);
1645
1646         pn533_poll_reset_mod_list(dev);
1647 }
1648
1649 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1650 {
1651         struct pn533_cmd_activate_response *rsp;
1652         u16 gt_len;
1653         int rc;
1654
1655         struct sk_buff *skb;
1656         struct sk_buff *resp;
1657
1658         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1659
1660         skb = pn533_alloc_skb(sizeof(u8) * 2); /*TG + Next*/
1661         if (!skb)
1662                 return -ENOMEM;
1663
1664         *skb_put(skb, sizeof(u8)) = 1; /* TG */
1665         *skb_put(skb, sizeof(u8)) = 0; /* Next */
1666
1667         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1668         if (IS_ERR(resp))
1669                 return PTR_ERR(resp);
1670
1671         rsp = (struct pn533_cmd_activate_response *)resp->data;
1672         rc = rsp->status & PN533_CMD_RET_MASK;
1673         if (rc != PN533_CMD_RET_SUCCESS)
1674                 dev_kfree_skb(resp);
1675                 return -EIO;
1676
1677         /* ATR_RES general bytes are located at offset 16 */
1678         gt_len = resp->len - 16;
1679         rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1680
1681         dev_kfree_skb(resp);
1682         return rc;
1683 }
1684
1685 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1686                                  struct nfc_target *target, u32 protocol)
1687 {
1688         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1689         int rc;
1690
1691         nfc_dev_dbg(&dev->interface->dev, "%s - protocol=%u", __func__,
1692                     protocol);
1693
1694         if (dev->poll_mod_count) {
1695                 nfc_dev_err(&dev->interface->dev,
1696                             "Cannot activate while polling");
1697                 return -EBUSY;
1698         }
1699
1700         if (dev->tgt_active_prot) {
1701                 nfc_dev_err(&dev->interface->dev,
1702                             "There is already an active target");
1703                 return -EBUSY;
1704         }
1705
1706         if (!dev->tgt_available_prots) {
1707                 nfc_dev_err(&dev->interface->dev,
1708                             "There is no available target to activate");
1709                 return -EINVAL;
1710         }
1711
1712         if (!(dev->tgt_available_prots & (1 << protocol))) {
1713                 nfc_dev_err(&dev->interface->dev,
1714                             "Target doesn't support requested proto %u",
1715                             protocol);
1716                 return -EINVAL;
1717         }
1718
1719         if (protocol == NFC_PROTO_NFC_DEP) {
1720                 rc = pn533_activate_target_nfcdep(dev);
1721                 if (rc) {
1722                         nfc_dev_err(&dev->interface->dev,
1723                                     "Activating target with DEP failed %d", rc);
1724                         return rc;
1725                 }
1726         }
1727
1728         dev->tgt_active_prot = protocol;
1729         dev->tgt_available_prots = 0;
1730
1731         return 0;
1732 }
1733
1734 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1735                                     struct nfc_target *target)
1736 {
1737         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1738
1739         struct sk_buff *skb;
1740         struct sk_buff *resp;
1741
1742         int rc;
1743
1744         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1745
1746         if (!dev->tgt_active_prot) {
1747                 nfc_dev_err(&dev->interface->dev, "There is no active target");
1748                 return;
1749         }
1750
1751         dev->tgt_active_prot = 0;
1752         skb_queue_purge(&dev->resp_q);
1753
1754         skb = pn533_alloc_skb(sizeof(u8));
1755         if (!skb)
1756                 return;
1757
1758         *skb_put(skb, 1) = 1; /* TG*/
1759
1760         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_RELEASE, skb);
1761         if (IS_ERR(resp))
1762                 return;
1763
1764         rc = resp->data[0] & PN533_CMD_RET_MASK;
1765         if (rc != PN533_CMD_RET_SUCCESS)
1766                 nfc_dev_err(&dev->interface->dev,
1767                             "Error 0x%x when releasing the target", rc);
1768
1769         dev_kfree_skb(resp);
1770         return;
1771 }
1772
1773
1774 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1775                                          struct sk_buff *resp)
1776 {
1777         struct pn533_cmd_jump_dep_response *rsp;
1778         u8 target_gt_len;
1779         int rc;
1780         u8 active = *(u8 *)arg;
1781
1782         kfree(arg);
1783
1784         if (IS_ERR(resp))
1785                 return PTR_ERR(resp);
1786
1787         if (dev->tgt_available_prots &&
1788             !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1789                 nfc_dev_err(&dev->interface->dev,
1790                             "The target does not support DEP");
1791                 rc =  -EINVAL;
1792                 goto error;
1793         }
1794
1795         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1796
1797         rc = rsp->status & PN533_CMD_RET_MASK;
1798         if (rc != PN533_CMD_RET_SUCCESS) {
1799                 nfc_dev_err(&dev->interface->dev,
1800                             "Bringing DEP link up failed %d", rc);
1801                 goto error;
1802         }
1803
1804         if (!dev->tgt_available_prots) {
1805                 struct nfc_target nfc_target;
1806
1807                 nfc_dev_dbg(&dev->interface->dev, "Creating new target");
1808
1809                 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1810                 nfc_target.nfcid1_len = 10;
1811                 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1812                 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1813                 if (rc)
1814                         goto error;
1815
1816                 dev->tgt_available_prots = 0;
1817         }
1818
1819         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1820
1821         /* ATR_RES general bytes are located at offset 17 */
1822         target_gt_len = resp->len - 17;
1823         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1824                                           rsp->gt, target_gt_len);
1825         if (rc == 0)
1826                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1827                                         dev->nfc_dev->targets[0].idx,
1828                                         !active, NFC_RF_INITIATOR);
1829
1830 error:
1831         dev_kfree_skb(resp);
1832         return rc;
1833 }
1834
1835 static int pn533_mod_to_baud(struct pn533 *dev)
1836 {
1837         switch (dev->poll_mod_curr) {
1838         case PN533_POLL_MOD_106KBPS_A:
1839                 return 0;
1840         case PN533_POLL_MOD_212KBPS_FELICA:
1841                 return 1;
1842         case PN533_POLL_MOD_424KBPS_FELICA:
1843                 return 2;
1844         default:
1845                 return -EINVAL;
1846         }
1847 }
1848
1849 #define PASSIVE_DATA_LEN 5
1850 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1851                              u8 comm_mode, u8 *gb, size_t gb_len)
1852 {
1853         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1854         struct sk_buff *skb;
1855         int rc, baud, skb_len;
1856         u8 *next, *arg;
1857
1858         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1859
1860         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1861
1862         if (dev->poll_mod_count) {
1863                 nfc_dev_err(&dev->interface->dev,
1864                             "Cannot bring the DEP link up while polling");
1865                 return -EBUSY;
1866         }
1867
1868         if (dev->tgt_active_prot) {
1869                 nfc_dev_err(&dev->interface->dev,
1870                             "There is already an active target");
1871                 return -EBUSY;
1872         }
1873
1874         baud = pn533_mod_to_baud(dev);
1875         if (baud < 0) {
1876                 nfc_dev_err(&dev->interface->dev,
1877                             "Invalid curr modulation %d", dev->poll_mod_curr);
1878                 return baud;
1879         }
1880
1881         skb_len = 3 + gb_len; /* ActPass + BR + Next */
1882         if (comm_mode == NFC_COMM_PASSIVE)
1883                 skb_len += PASSIVE_DATA_LEN;
1884
1885         skb = pn533_alloc_skb(skb_len);
1886         if (!skb)
1887                 return -ENOMEM;
1888
1889         *skb_put(skb, 1) = !comm_mode;  /* ActPass */
1890         *skb_put(skb, 1) = baud;  /* Baud rate */
1891
1892         next = skb_put(skb, 1);  /* Next */
1893         *next = 0;
1894
1895         if (comm_mode == NFC_COMM_PASSIVE && baud > 0) {
1896                 memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data,
1897                        PASSIVE_DATA_LEN);
1898                 *next |= 1;
1899         }
1900
1901         if (gb != NULL && gb_len > 0) {
1902                 memcpy(skb_put(skb, gb_len), gb, gb_len);
1903                 *next |= 4; /* We have some Gi */
1904         } else {
1905                 *next = 0;
1906         }
1907
1908         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
1909         if (!arg) {
1910                 dev_kfree_skb(skb);
1911                 return -ENOMEM;
1912         }
1913
1914         *arg = !comm_mode;
1915
1916         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1917                                   pn533_in_dep_link_up_complete, arg);
1918
1919         if (rc < 0) {
1920                 dev_kfree_skb(skb);
1921                 kfree(arg);
1922         }
1923
1924         return rc;
1925 }
1926
1927 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
1928 {
1929         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1930
1931         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1932
1933         pn533_poll_reset_mod_list(dev);
1934
1935         if (dev->tgt_mode || dev->tgt_active_prot) {
1936                 pn533_send_ack(dev, GFP_KERNEL);
1937                 usb_kill_urb(dev->in_urb);
1938         }
1939
1940         dev->tgt_active_prot = 0;
1941         dev->tgt_mode = 0;
1942
1943         skb_queue_purge(&dev->resp_q);
1944
1945         return 0;
1946 }
1947
1948 struct pn533_data_exchange_arg {
1949         data_exchange_cb_t cb;
1950         void *cb_context;
1951 };
1952
1953 static struct sk_buff *pn533_build_response(struct pn533 *dev)
1954 {
1955         struct sk_buff *skb, *tmp, *t;
1956         unsigned int skb_len = 0, tmp_len = 0;
1957
1958         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1959
1960         if (skb_queue_empty(&dev->resp_q))
1961                 return NULL;
1962
1963         if (skb_queue_len(&dev->resp_q) == 1) {
1964                 skb = skb_dequeue(&dev->resp_q);
1965                 goto out;
1966         }
1967
1968         skb_queue_walk_safe(&dev->resp_q, tmp, t)
1969                 skb_len += tmp->len;
1970
1971         nfc_dev_dbg(&dev->interface->dev, "%s total length %d\n",
1972                     __func__, skb_len);
1973
1974         skb = alloc_skb(skb_len, GFP_KERNEL);
1975         if (skb == NULL)
1976                 goto out;
1977
1978         skb_put(skb, skb_len);
1979
1980         skb_queue_walk_safe(&dev->resp_q, tmp, t) {
1981                 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
1982                 tmp_len += tmp->len;
1983         }
1984
1985 out:
1986         skb_queue_purge(&dev->resp_q);
1987
1988         return skb;
1989 }
1990
1991 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
1992                                         struct sk_buff *resp)
1993 {
1994         struct pn533_data_exchange_arg *arg = _arg;
1995         struct sk_buff *skb;
1996         int rc = 0;
1997         u8 status, ret, mi;
1998
1999         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2000
2001         if (IS_ERR(resp)) {
2002                 rc = PTR_ERR(resp);
2003                 goto _error;
2004         }
2005
2006         status = resp->data[0];
2007         ret = status & PN533_CMD_RET_MASK;
2008         mi = status & PN533_CMD_MI_MASK;
2009
2010         skb_pull(resp, sizeof(status));
2011
2012         if (ret != PN533_CMD_RET_SUCCESS) {
2013                 nfc_dev_err(&dev->interface->dev,
2014                             "PN533 reported error %d when exchanging data",
2015                             ret);
2016                 rc = -EIO;
2017                 goto error;
2018         }
2019
2020         skb_queue_tail(&dev->resp_q, resp);
2021
2022         if (mi) {
2023                 dev->cmd_complete_mi_arg = arg;
2024                 queue_work(dev->wq, &dev->mi_work);
2025                 return -EINPROGRESS;
2026         }
2027
2028         skb = pn533_build_response(dev);
2029         if (!skb)
2030                 goto error;
2031
2032         arg->cb(arg->cb_context, skb, 0);
2033         kfree(arg);
2034         return 0;
2035
2036 error:
2037         dev_kfree_skb(resp);
2038 _error:
2039         skb_queue_purge(&dev->resp_q);
2040         arg->cb(arg->cb_context, NULL, rc);
2041         kfree(arg);
2042         return rc;
2043 }
2044
2045 static int pn533_transceive(struct nfc_dev *nfc_dev,
2046                             struct nfc_target *target, struct sk_buff *skb,
2047                             data_exchange_cb_t cb, void *cb_context)
2048 {
2049         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2050         struct pn533_data_exchange_arg *arg = NULL;
2051         int rc;
2052
2053         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2054
2055         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2056                 /* TODO: Implement support to multi-part data exchange */
2057                 nfc_dev_err(&dev->interface->dev,
2058                             "Data length greater than the max allowed: %d",
2059                             PN533_CMD_DATAEXCH_DATA_MAXLEN);
2060                 rc = -ENOSYS;
2061                 goto error;
2062         }
2063
2064         if (!dev->tgt_active_prot) {
2065                 nfc_dev_err(&dev->interface->dev,
2066                             "Can't exchange data if there is no active target");
2067                 rc = -EINVAL;
2068                 goto error;
2069         }
2070
2071         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2072         if (!arg) {
2073                 rc = -ENOMEM;
2074                 goto error;
2075         }
2076
2077         arg->cb = cb;
2078         arg->cb_context = cb_context;
2079
2080         switch (dev->device_type) {
2081         case PN533_DEVICE_PASORI:
2082                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2083                         rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2084                                                    skb,
2085                                                    pn533_data_exchange_complete,
2086                                                    arg);
2087
2088                         break;
2089                 }
2090         default:
2091                 *skb_push(skb, sizeof(u8)) =  1; /*TG*/
2092
2093                 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2094                                            skb, pn533_data_exchange_complete,
2095                                            arg);
2096
2097                 break;
2098         }
2099
2100         if (rc < 0) /* rc from send_async */
2101                 goto error;
2102
2103         return 0;
2104
2105 error:
2106         kfree(arg);
2107         dev_kfree_skb(skb);
2108         return rc;
2109 }
2110
2111 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2112                                   struct sk_buff *resp)
2113 {
2114         u8 status;
2115
2116         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2117
2118         if (IS_ERR(resp))
2119                 return PTR_ERR(resp);
2120
2121         status = resp->data[0];
2122
2123         dev_kfree_skb(resp);
2124
2125         if (status != 0) {
2126                 nfc_tm_deactivated(dev->nfc_dev);
2127
2128                 dev->tgt_mode = 0;
2129
2130                 return 0;
2131         }
2132
2133         queue_work(dev->wq, &dev->tg_work);
2134
2135         return 0;
2136 }
2137
2138 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2139 {
2140         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2141         int rc;
2142
2143         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2144
2145         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2146                 nfc_dev_err(&dev->interface->dev,
2147                             "Data length greater than the max allowed: %d",
2148                             PN533_CMD_DATAEXCH_DATA_MAXLEN);
2149                 return -ENOSYS;
2150         }
2151
2152         rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2153                                    pn533_tm_send_complete, NULL);
2154         if (rc < 0)
2155                 dev_kfree_skb(skb);
2156
2157         return rc;
2158 }
2159
2160 static void pn533_wq_mi_recv(struct work_struct *work)
2161 {
2162         struct pn533 *dev = container_of(work, struct pn533, mi_work);
2163
2164         struct sk_buff *skb;
2165         int rc;
2166
2167         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2168
2169         skb = pn533_alloc_skb(PN533_CMD_DATAEXCH_HEAD_LEN);
2170         if (!skb)
2171                 goto error;
2172
2173         switch (dev->device_type) {
2174         case PN533_DEVICE_PASORI:
2175                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2176                         rc = pn533_send_cmd_direct_async(dev,
2177                                                 PN533_CMD_IN_COMM_THRU,
2178                                                 skb,
2179                                                 pn533_data_exchange_complete,
2180                                                  dev->cmd_complete_mi_arg);
2181
2182                         break;
2183                 }
2184         default:
2185                 *skb_put(skb, sizeof(u8)) =  1; /*TG*/
2186
2187                 rc = pn533_send_cmd_direct_async(dev,
2188                                                  PN533_CMD_IN_DATA_EXCHANGE,
2189                                                  skb,
2190                                                  pn533_data_exchange_complete,
2191                                                  dev->cmd_complete_mi_arg);
2192
2193                 break;
2194         }
2195
2196         if (rc == 0) /* success */
2197                 return;
2198
2199         nfc_dev_err(&dev->interface->dev,
2200                     "Error %d when trying to perform data_exchange", rc);
2201
2202         dev_kfree_skb(skb);
2203         kfree(dev->cmd_complete_arg);
2204
2205 error:
2206         pn533_send_ack(dev, GFP_KERNEL);
2207         queue_work(dev->wq, &dev->cmd_work);
2208 }
2209
2210 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2211                                                                 u8 cfgdata_len)
2212 {
2213         struct sk_buff *skb;
2214         struct sk_buff *resp;
2215
2216         int skb_len;
2217
2218         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2219
2220         skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2221
2222         skb = pn533_alloc_skb(skb_len);
2223         if (!skb)
2224                 return -ENOMEM;
2225
2226         *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2227         memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2228
2229         resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2230         if (IS_ERR(resp))
2231                 return PTR_ERR(resp);
2232
2233         dev_kfree_skb(resp);
2234         return 0;
2235 }
2236
2237 static int pn533_get_firmware_version(struct pn533 *dev,
2238                                       struct pn533_fw_version *fv)
2239 {
2240         struct sk_buff *skb;
2241         struct sk_buff *resp;
2242
2243         skb = pn533_alloc_skb(0);
2244         if (!skb)
2245                 return -ENOMEM;
2246
2247         resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2248         if (IS_ERR(resp))
2249                 return PTR_ERR(resp);
2250
2251         fv->ic = resp->data[0];
2252         fv->ver = resp->data[1];
2253         fv->rev = resp->data[2];
2254         fv->support = resp->data[3];
2255
2256         dev_kfree_skb(resp);
2257         return 0;
2258 }
2259
2260 static int pn533_fw_reset(struct pn533 *dev)
2261 {
2262         struct sk_buff *skb;
2263         struct sk_buff *resp;
2264
2265         nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2266
2267         skb = pn533_alloc_skb(sizeof(u8));
2268         if (!skb)
2269                 return -ENOMEM;
2270
2271         *skb_put(skb, sizeof(u8)) = 0x1;
2272
2273         resp = pn533_send_cmd_sync(dev, 0x18, skb);
2274         if (IS_ERR(resp))
2275                 return PTR_ERR(resp);
2276
2277         dev_kfree_skb(resp);
2278
2279         return 0;
2280 }
2281
2282 static struct nfc_ops pn533_nfc_ops = {
2283         .dev_up = NULL,
2284         .dev_down = NULL,
2285         .dep_link_up = pn533_dep_link_up,
2286         .dep_link_down = pn533_dep_link_down,
2287         .start_poll = pn533_start_poll,
2288         .stop_poll = pn533_stop_poll,
2289         .activate_target = pn533_activate_target,
2290         .deactivate_target = pn533_deactivate_target,
2291         .im_transceive = pn533_transceive,
2292         .tm_send = pn533_tm_send,
2293 };
2294
2295 static int pn533_setup(struct pn533 *dev)
2296 {
2297         struct pn533_config_max_retries max_retries;
2298         struct pn533_config_timing timing;
2299         u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2300         int rc;
2301
2302         switch (dev->device_type) {
2303         case PN533_DEVICE_STD:
2304                 max_retries.mx_rty_atr = PN533_CONFIG_MAX_RETRIES_ENDLESS;
2305                 max_retries.mx_rty_psl = 2;
2306                 max_retries.mx_rty_passive_act =
2307                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2308
2309                 timing.rfu = PN533_CONFIG_TIMING_102;
2310                 timing.atr_res_timeout = PN533_CONFIG_TIMING_204;
2311                 timing.dep_timeout = PN533_CONFIG_TIMING_409;
2312
2313                 break;
2314
2315         case PN533_DEVICE_PASORI:
2316                 max_retries.mx_rty_atr = 0x2;
2317                 max_retries.mx_rty_psl = 0x1;
2318                 max_retries.mx_rty_passive_act =
2319                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2320
2321                 timing.rfu = PN533_CONFIG_TIMING_102;
2322                 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2323                 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2324
2325                 break;
2326
2327         default:
2328                 nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2329                             dev->device_type);
2330                 return -EINVAL;
2331         }
2332
2333         rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2334                                      (u8 *)&max_retries, sizeof(max_retries));
2335         if (rc) {
2336                 nfc_dev_err(&dev->interface->dev,
2337                             "Error on setting MAX_RETRIES config");
2338                 return rc;
2339         }
2340
2341
2342         rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2343                                      (u8 *)&timing, sizeof(timing));
2344         if (rc) {
2345                 nfc_dev_err(&dev->interface->dev,
2346                             "Error on setting RF timings");
2347                 return rc;
2348         }
2349
2350         switch (dev->device_type) {
2351         case PN533_DEVICE_STD:
2352                 break;
2353
2354         case PN533_DEVICE_PASORI:
2355                 pn533_fw_reset(dev);
2356
2357                 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2358                                              pasori_cfg, 3);
2359                 if (rc) {
2360                         nfc_dev_err(&dev->interface->dev,
2361                                     "Error while settings PASORI config");
2362                         return rc;
2363                 }
2364
2365                 pn533_fw_reset(dev);
2366
2367                 break;
2368         }
2369
2370         return 0;
2371 }
2372
2373 static int pn533_probe(struct usb_interface *interface,
2374                         const struct usb_device_id *id)
2375 {
2376         struct pn533_fw_version fw_ver;
2377         struct pn533 *dev;
2378         struct usb_host_interface *iface_desc;
2379         struct usb_endpoint_descriptor *endpoint;
2380         int in_endpoint = 0;
2381         int out_endpoint = 0;
2382         int rc = -ENOMEM;
2383         int i;
2384         u32 protocols;
2385
2386         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2387         if (!dev)
2388                 return -ENOMEM;
2389
2390         dev->udev = usb_get_dev(interface_to_usbdev(interface));
2391         dev->interface = interface;
2392         mutex_init(&dev->cmd_lock);
2393
2394         iface_desc = interface->cur_altsetting;
2395         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
2396                 endpoint = &iface_desc->endpoint[i].desc;
2397
2398                 if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
2399                         in_endpoint = endpoint->bEndpointAddress;
2400
2401                 if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
2402                         out_endpoint = endpoint->bEndpointAddress;
2403         }
2404
2405         if (!in_endpoint || !out_endpoint) {
2406                 nfc_dev_err(&interface->dev,
2407                             "Could not find bulk-in or bulk-out endpoint");
2408                 rc = -ENODEV;
2409                 goto error;
2410         }
2411
2412         dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
2413         dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
2414
2415         if (!dev->in_urb || !dev->out_urb)
2416                 goto error;
2417
2418         usb_fill_bulk_urb(dev->in_urb, dev->udev,
2419                           usb_rcvbulkpipe(dev->udev, in_endpoint),
2420                           NULL, 0, NULL, dev);
2421         usb_fill_bulk_urb(dev->out_urb, dev->udev,
2422                           usb_sndbulkpipe(dev->udev, out_endpoint),
2423                           NULL, 0, pn533_send_complete, dev);
2424
2425         INIT_WORK(&dev->cmd_work, pn533_wq_cmd);
2426         INIT_WORK(&dev->cmd_complete_work, pn533_wq_cmd_complete);
2427         INIT_WORK(&dev->mi_work, pn533_wq_mi_recv);
2428         INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
2429         INIT_WORK(&dev->poll_work, pn533_wq_poll);
2430         dev->wq = alloc_ordered_workqueue("pn533", 0);
2431         if (dev->wq == NULL)
2432                 goto error;
2433
2434         init_timer(&dev->listen_timer);
2435         dev->listen_timer.data = (unsigned long) dev;
2436         dev->listen_timer.function = pn533_listen_mode_timer;
2437
2438         skb_queue_head_init(&dev->resp_q);
2439
2440         INIT_LIST_HEAD(&dev->cmd_queue);
2441
2442         usb_set_intfdata(interface, dev);
2443
2444         memset(&fw_ver, 0, sizeof(fw_ver));
2445         rc = pn533_get_firmware_version(dev, &fw_ver);
2446         if (rc < 0)
2447                 goto destroy_wq;
2448
2449         nfc_dev_info(&dev->interface->dev,
2450                      "NXP PN533 firmware ver %d.%d now attached",
2451                      fw_ver.ver, fw_ver.rev);
2452
2453         dev->device_type = id->driver_info;
2454         switch (dev->device_type) {
2455         case PN533_DEVICE_STD:
2456                 protocols = PN533_ALL_PROTOCOLS;
2457                 break;
2458
2459         case PN533_DEVICE_PASORI:
2460                 protocols = PN533_NO_TYPE_B_PROTOCOLS;
2461                 break;
2462
2463         default:
2464                 nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2465                             dev->device_type);
2466                 rc = -EINVAL;
2467                 goto destroy_wq;
2468         }
2469
2470         dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2471                                            PN533_FRAME_HEADER_LEN +
2472                                            PN533_CMD_DATAEXCH_HEAD_LEN,
2473                                            PN533_FRAME_TAIL_LEN);
2474         if (!dev->nfc_dev)
2475                 goto destroy_wq;
2476
2477         nfc_set_parent_dev(dev->nfc_dev, &interface->dev);
2478         nfc_set_drvdata(dev->nfc_dev, dev);
2479
2480         rc = nfc_register_device(dev->nfc_dev);
2481         if (rc)
2482                 goto free_nfc_dev;
2483
2484         rc = pn533_setup(dev);
2485         if (rc)
2486                 goto unregister_nfc_dev;
2487
2488         return 0;
2489
2490 unregister_nfc_dev:
2491         nfc_unregister_device(dev->nfc_dev);
2492
2493 free_nfc_dev:
2494         nfc_free_device(dev->nfc_dev);
2495
2496 destroy_wq:
2497         destroy_workqueue(dev->wq);
2498 error:
2499         usb_free_urb(dev->in_urb);
2500         usb_free_urb(dev->out_urb);
2501         kfree(dev);
2502         return rc;
2503 }
2504
2505 static void pn533_disconnect(struct usb_interface *interface)
2506 {
2507         struct pn533 *dev;
2508         struct pn533_cmd *cmd, *n;
2509
2510         dev = usb_get_intfdata(interface);
2511         usb_set_intfdata(interface, NULL);
2512
2513         nfc_unregister_device(dev->nfc_dev);
2514         nfc_free_device(dev->nfc_dev);
2515
2516         usb_kill_urb(dev->in_urb);
2517         usb_kill_urb(dev->out_urb);
2518
2519         destroy_workqueue(dev->wq);
2520
2521         skb_queue_purge(&dev->resp_q);
2522
2523         del_timer(&dev->listen_timer);
2524
2525         list_for_each_entry_safe(cmd, n, &dev->cmd_queue, queue) {
2526                 list_del(&cmd->queue);
2527                 kfree(cmd);
2528         }
2529
2530         usb_free_urb(dev->in_urb);
2531         usb_free_urb(dev->out_urb);
2532         kfree(dev);
2533
2534         nfc_dev_info(&interface->dev, "NXP PN533 NFC device disconnected");
2535 }
2536
2537 static struct usb_driver pn533_driver = {
2538         .name =         "pn533",
2539         .probe =        pn533_probe,
2540         .disconnect =   pn533_disconnect,
2541         .id_table =     pn533_table,
2542 };
2543
2544 module_usb_driver(pn533_driver);
2545
2546 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>,"
2547                         " Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2548 MODULE_DESCRIPTION("PN533 usb driver ver " VERSION);
2549 MODULE_VERSION(VERSION);
2550 MODULE_LICENSE("GPL");