linux/drivers/nfc/pn533.c
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   1/*
   2 * Copyright (C) 2011 Instituto Nokia de Tecnologia
   3 * Copyright (C) 2012-2013 Tieto Poland
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; either version 2 of the License, or
   8 * (at your option) any later version.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the
  17 * Free Software Foundation, Inc.,
  18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19 */
  20
  21#include <linux/device.h>
  22#include <linux/kernel.h>
  23#include <linux/module.h>
  24#include <linux/slab.h>
  25#include <linux/usb.h>
  26#include <linux/nfc.h>
  27#include <linux/netdevice.h>
  28#include <net/nfc/nfc.h>
  29
  30#define VERSION "0.2"
  31
  32#define PN533_VENDOR_ID 0x4CC
  33#define PN533_PRODUCT_ID 0x2533
  34
  35#define SCM_VENDOR_ID 0x4E6
  36#define SCL3711_PRODUCT_ID 0x5591
  37
  38#define SONY_VENDOR_ID         0x054c
  39#define PASORI_PRODUCT_ID      0x02e1
  40
  41#define ACS_VENDOR_ID 0x072f
  42#define ACR122U_PRODUCT_ID 0x2200
  43
  44#define PN533_DEVICE_STD     0x1
  45#define PN533_DEVICE_PASORI  0x2
  46#define PN533_DEVICE_ACR122U 0x3
  47
  48#define PN533_ALL_PROTOCOLS (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK |\
  49                             NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK |\
  50                             NFC_PROTO_NFC_DEP_MASK |\
  51                             NFC_PROTO_ISO14443_B_MASK)
  52
  53#define PN533_NO_TYPE_B_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
  54                                   NFC_PROTO_MIFARE_MASK | \
  55                                   NFC_PROTO_FELICA_MASK | \
  56                                   NFC_PROTO_ISO14443_MASK | \
  57                                   NFC_PROTO_NFC_DEP_MASK)
  58
  59static const struct usb_device_id pn533_table[] = {
  60        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE,
  61          .idVendor             = PN533_VENDOR_ID,
  62          .idProduct            = PN533_PRODUCT_ID,
  63          .driver_info          = PN533_DEVICE_STD,
  64        },
  65        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE,
  66          .idVendor             = SCM_VENDOR_ID,
  67          .idProduct            = SCL3711_PRODUCT_ID,
  68          .driver_info          = PN533_DEVICE_STD,
  69        },
  70        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE,
  71          .idVendor             = SONY_VENDOR_ID,
  72          .idProduct            = PASORI_PRODUCT_ID,
  73          .driver_info          = PN533_DEVICE_PASORI,
  74        },
  75        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE,
  76          .idVendor             = ACS_VENDOR_ID,
  77          .idProduct            = ACR122U_PRODUCT_ID,
  78          .driver_info          = PN533_DEVICE_ACR122U,
  79        },
  80        { }
  81};
  82MODULE_DEVICE_TABLE(usb, pn533_table);
  83
  84/* How much time we spend listening for initiators */
  85#define PN533_LISTEN_TIME 2
  86/* Delay between each poll frame (ms) */
  87#define PN533_POLL_INTERVAL 10
  88
  89/* Standard pn533 frame definitions (standard and extended)*/
  90#define PN533_STD_FRAME_HEADER_LEN (sizeof(struct pn533_std_frame) \
  91                                        + 2) /* data[0] TFI, data[1] CC */
  92#define PN533_STD_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
  93
  94#define PN533_EXT_FRAME_HEADER_LEN (sizeof(struct pn533_ext_frame) \
  95                                        + 2) /* data[0] TFI, data[1] CC */
  96
  97#define PN533_CMD_DATAEXCH_DATA_MAXLEN  262
  98#define PN533_CMD_DATAFRAME_MAXLEN      240     /* max data length (send) */
  99
 100/*
 101 * Max extended frame payload len, excluding TFI and CC
 102 * which are already in PN533_FRAME_HEADER_LEN.
 103 */
 104#define PN533_STD_FRAME_MAX_PAYLOAD_LEN 263
 105
 106#define PN533_STD_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2),
 107                                  Postamble (1) */
 108#define PN533_STD_FRAME_CHECKSUM(f) (f->data[f->datalen])
 109#define PN533_STD_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])
 110/* Half start code (3), LEN (4) should be 0xffff for extended frame */
 111#define PN533_STD_IS_EXTENDED(hdr) ((hdr)->datalen == 0xFF \
 112                                        && (hdr)->datalen_checksum == 0xFF)
 113#define PN533_EXT_FRAME_CHECKSUM(f) (f->data[be16_to_cpu(f->datalen)])
 114
 115/* start of frame */
 116#define PN533_STD_FRAME_SOF 0x00FF
 117
 118/* standard frame identifier: in/out/error */
 119#define PN533_STD_FRAME_IDENTIFIER(f) (f->data[0]) /* TFI */
 120#define PN533_STD_FRAME_DIR_OUT 0xD4
 121#define PN533_STD_FRAME_DIR_IN 0xD5
 122
 123/* ACS ACR122 pn533 frame definitions */
 124#define PN533_ACR122_TX_FRAME_HEADER_LEN (sizeof(struct pn533_acr122_tx_frame) \
 125                                          + 2)
 126#define PN533_ACR122_TX_FRAME_TAIL_LEN 0
 127#define PN533_ACR122_RX_FRAME_HEADER_LEN (sizeof(struct pn533_acr122_rx_frame) \
 128                                          + 2)
 129#define PN533_ACR122_RX_FRAME_TAIL_LEN 2
 130#define PN533_ACR122_FRAME_MAX_PAYLOAD_LEN PN533_STD_FRAME_MAX_PAYLOAD_LEN
 131
 132/* CCID messages types */
 133#define PN533_ACR122_PC_TO_RDR_ICCPOWERON 0x62
 134#define PN533_ACR122_PC_TO_RDR_ESCAPE 0x6B
 135
 136#define PN533_ACR122_RDR_TO_PC_ESCAPE 0x83
 137
 138/* PN533 Commands */
 139#define PN533_FRAME_CMD(f) (f->data[1])
 140
 141#define PN533_CMD_GET_FIRMWARE_VERSION 0x02
 142#define PN533_CMD_RF_CONFIGURATION 0x32
 143#define PN533_CMD_IN_DATA_EXCHANGE 0x40
 144#define PN533_CMD_IN_COMM_THRU     0x42
 145#define PN533_CMD_IN_LIST_PASSIVE_TARGET 0x4A
 146#define PN533_CMD_IN_ATR 0x50
 147#define PN533_CMD_IN_RELEASE 0x52
 148#define PN533_CMD_IN_JUMP_FOR_DEP 0x56
 149
 150#define PN533_CMD_TG_INIT_AS_TARGET 0x8c
 151#define PN533_CMD_TG_GET_DATA 0x86
 152#define PN533_CMD_TG_SET_DATA 0x8e
 153#define PN533_CMD_UNDEF 0xff
 154
 155#define PN533_CMD_RESPONSE(cmd) (cmd + 1)
 156
 157/* PN533 Return codes */
 158#define PN533_CMD_RET_MASK 0x3F
 159#define PN533_CMD_MI_MASK 0x40
 160#define PN533_CMD_RET_SUCCESS 0x00
 161
 162struct pn533;
 163
 164typedef int (*pn533_send_async_complete_t) (struct pn533 *dev, void *arg,
 165                                        struct sk_buff *resp);
 166
 167/* structs for pn533 commands */
 168
 169/* PN533_CMD_GET_FIRMWARE_VERSION */
 170struct pn533_fw_version {
 171        u8 ic;
 172        u8 ver;
 173        u8 rev;
 174        u8 support;
 175};
 176
 177/* PN533_CMD_RF_CONFIGURATION */
 178#define PN533_CFGITEM_RF_FIELD    0x01
 179#define PN533_CFGITEM_TIMING      0x02
 180#define PN533_CFGITEM_MAX_RETRIES 0x05
 181#define PN533_CFGITEM_PASORI      0x82
 182
 183#define PN533_CFGITEM_RF_FIELD_AUTO_RFCA 0x2
 184#define PN533_CFGITEM_RF_FIELD_ON        0x1
 185#define PN533_CFGITEM_RF_FIELD_OFF       0x0
 186
 187#define PN533_CONFIG_TIMING_102 0xb
 188#define PN533_CONFIG_TIMING_204 0xc
 189#define PN533_CONFIG_TIMING_409 0xd
 190#define PN533_CONFIG_TIMING_819 0xe
 191
 192#define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
 193#define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
 194
 195struct pn533_config_max_retries {
 196        u8 mx_rty_atr;
 197        u8 mx_rty_psl;
 198        u8 mx_rty_passive_act;
 199} __packed;
 200
 201struct pn533_config_timing {
 202        u8 rfu;
 203        u8 atr_res_timeout;
 204        u8 dep_timeout;
 205} __packed;
 206
 207/* PN533_CMD_IN_LIST_PASSIVE_TARGET */
 208
 209/* felica commands opcode */
 210#define PN533_FELICA_OPC_SENSF_REQ 0
 211#define PN533_FELICA_OPC_SENSF_RES 1
 212/* felica SENSF_REQ parameters */
 213#define PN533_FELICA_SENSF_SC_ALL 0xFFFF
 214#define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
 215#define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
 216#define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
 217
 218/* type B initiator_data values */
 219#define PN533_TYPE_B_AFI_ALL_FAMILIES 0
 220#define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
 221#define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
 222
 223union pn533_cmd_poll_initdata {
 224        struct {
 225                u8 afi;
 226                u8 polling_method;
 227        } __packed type_b;
 228        struct {
 229                u8 opcode;
 230                __be16 sc;
 231                u8 rc;
 232                u8 tsn;
 233        } __packed felica;
 234};
 235
 236/* Poll modulations */
 237enum {
 238        PN533_POLL_MOD_106KBPS_A,
 239        PN533_POLL_MOD_212KBPS_FELICA,
 240        PN533_POLL_MOD_424KBPS_FELICA,
 241        PN533_POLL_MOD_106KBPS_JEWEL,
 242        PN533_POLL_MOD_847KBPS_B,
 243        PN533_LISTEN_MOD,
 244
 245        __PN533_POLL_MOD_AFTER_LAST,
 246};
 247#define PN533_POLL_MOD_MAX (__PN533_POLL_MOD_AFTER_LAST - 1)
 248
 249struct pn533_poll_modulations {
 250        struct {
 251                u8 maxtg;
 252                u8 brty;
 253                union pn533_cmd_poll_initdata initiator_data;
 254        } __packed data;
 255        u8 len;
 256};
 257
 258static const struct pn533_poll_modulations poll_mod[] = {
 259        [PN533_POLL_MOD_106KBPS_A] = {
 260                .data = {
 261                        .maxtg = 1,
 262                        .brty = 0,
 263                },
 264                .len = 2,
 265        },
 266        [PN533_POLL_MOD_212KBPS_FELICA] = {
 267                .data = {
 268                        .maxtg = 1,
 269                        .brty = 1,
 270                        .initiator_data.felica = {
 271                                .opcode = PN533_FELICA_OPC_SENSF_REQ,
 272                                .sc = PN533_FELICA_SENSF_SC_ALL,
 273                                .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
 274                                .tsn = 0x03,
 275                        },
 276                },
 277                .len = 7,
 278        },
 279        [PN533_POLL_MOD_424KBPS_FELICA] = {
 280                .data = {
 281                        .maxtg = 1,
 282                        .brty = 2,
 283                        .initiator_data.felica = {
 284                                .opcode = PN533_FELICA_OPC_SENSF_REQ,
 285                                .sc = PN533_FELICA_SENSF_SC_ALL,
 286                                .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
 287                                .tsn = 0x03,
 288                        },
 289                 },
 290                .len = 7,
 291        },
 292        [PN533_POLL_MOD_106KBPS_JEWEL] = {
 293                .data = {
 294                        .maxtg = 1,
 295                        .brty = 4,
 296                },
 297                .len = 2,
 298        },
 299        [PN533_POLL_MOD_847KBPS_B] = {
 300                .data = {
 301                        .maxtg = 1,
 302                        .brty = 8,
 303                        .initiator_data.type_b = {
 304                                .afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
 305                                .polling_method =
 306                                        PN533_TYPE_B_POLL_METHOD_TIMESLOT,
 307                        },
 308                },
 309                .len = 3,
 310        },
 311        [PN533_LISTEN_MOD] = {
 312                .len = 0,
 313        },
 314};
 315
 316/* PN533_CMD_IN_ATR */
 317
 318struct pn533_cmd_activate_response {
 319        u8 status;
 320        u8 nfcid3t[10];
 321        u8 didt;
 322        u8 bst;
 323        u8 brt;
 324        u8 to;
 325        u8 ppt;
 326        /* optional */
 327        u8 gt[];
 328} __packed;
 329
 330struct pn533_cmd_jump_dep_response {
 331        u8 status;
 332        u8 tg;
 333        u8 nfcid3t[10];
 334        u8 didt;
 335        u8 bst;
 336        u8 brt;
 337        u8 to;
 338        u8 ppt;
 339        /* optional */
 340        u8 gt[];
 341} __packed;
 342
 343
 344/* PN533_TG_INIT_AS_TARGET */
 345#define PN533_INIT_TARGET_PASSIVE 0x1
 346#define PN533_INIT_TARGET_DEP 0x2
 347
 348#define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
 349#define PN533_INIT_TARGET_RESP_ACTIVE     0x1
 350#define PN533_INIT_TARGET_RESP_DEP        0x4
 351
 352enum  pn533_protocol_type {
 353        PN533_PROTO_REQ_ACK_RESP = 0,
 354        PN533_PROTO_REQ_RESP
 355};
 356
 357struct pn533 {
 358        struct usb_device *udev;
 359        struct usb_interface *interface;
 360        struct nfc_dev *nfc_dev;
 361        u32 device_type;
 362        enum pn533_protocol_type protocol_type;
 363
 364        struct urb *out_urb;
 365        struct urb *in_urb;
 366
 367        struct sk_buff_head resp_q;
 368        struct sk_buff_head fragment_skb;
 369
 370        struct workqueue_struct *wq;
 371        struct work_struct cmd_work;
 372        struct work_struct cmd_complete_work;
 373        struct delayed_work poll_work;
 374        struct work_struct mi_rx_work;
 375        struct work_struct mi_tx_work;
 376        struct work_struct tg_work;
 377        struct work_struct rf_work;
 378
 379        struct list_head cmd_queue;
 380        struct pn533_cmd *cmd;
 381        u8 cmd_pending;
 382        struct mutex cmd_lock;  /* protects cmd queue */
 383
 384        void *cmd_complete_mi_arg;
 385        void *cmd_complete_dep_arg;
 386
 387        struct pn533_poll_modulations *poll_mod_active[PN533_POLL_MOD_MAX + 1];
 388        u8 poll_mod_count;
 389        u8 poll_mod_curr;
 390        u32 poll_protocols;
 391        u32 listen_protocols;
 392        struct timer_list listen_timer;
 393        int cancel_listen;
 394
 395        u8 *gb;
 396        size_t gb_len;
 397
 398        u8 tgt_available_prots;
 399        u8 tgt_active_prot;
 400        u8 tgt_mode;
 401
 402        struct pn533_frame_ops *ops;
 403};
 404
 405struct pn533_cmd {
 406        struct list_head queue;
 407        u8 code;
 408        int status;
 409        struct sk_buff *req;
 410        struct sk_buff *resp;
 411        int resp_len;
 412        pn533_send_async_complete_t  complete_cb;
 413        void *complete_cb_context;
 414};
 415
 416struct pn533_std_frame {
 417        u8 preamble;
 418        __be16 start_frame;
 419        u8 datalen;
 420        u8 datalen_checksum;
 421        u8 data[];
 422} __packed;
 423
 424struct pn533_ext_frame {        /* Extended Information frame */
 425        u8 preamble;
 426        __be16 start_frame;
 427        __be16 eif_flag;        /* fixed to 0xFFFF */
 428        __be16 datalen;
 429        u8 datalen_checksum;
 430        u8 data[];
 431} __packed;
 432
 433struct pn533_frame_ops {
 434        void (*tx_frame_init)(void *frame, u8 cmd_code);
 435        void (*tx_frame_finish)(void *frame);
 436        void (*tx_update_payload_len)(void *frame, int len);
 437        int tx_header_len;
 438        int tx_tail_len;
 439
 440        bool (*rx_is_frame_valid)(void *frame, struct pn533 *dev);
 441        int (*rx_frame_size)(void *frame);
 442        int rx_header_len;
 443        int rx_tail_len;
 444
 445        int max_payload_len;
 446        u8 (*get_cmd_code)(void *frame);
 447};
 448
 449struct pn533_acr122_ccid_hdr {
 450        u8 type;
 451        u32 datalen;
 452        u8 slot;
 453        u8 seq;
 454        u8 params[3]; /* 3 msg specific bytes or status, error and 1 specific
 455                         byte for reposnse msg */
 456        u8 data[]; /* payload */
 457} __packed;
 458
 459struct pn533_acr122_apdu_hdr {
 460        u8 class;
 461        u8 ins;
 462        u8 p1;
 463        u8 p2;
 464} __packed;
 465
 466struct pn533_acr122_tx_frame {
 467        struct pn533_acr122_ccid_hdr ccid;
 468        struct pn533_acr122_apdu_hdr apdu;
 469        u8 datalen;
 470        u8 data[]; /* pn533 frame: TFI ... */
 471} __packed;
 472
 473struct pn533_acr122_rx_frame {
 474        struct pn533_acr122_ccid_hdr ccid;
 475        u8 data[]; /* pn533 frame : TFI ... */
 476} __packed;
 477
 478static void pn533_acr122_tx_frame_init(void *_frame, u8 cmd_code)
 479{
 480        struct pn533_acr122_tx_frame *frame = _frame;
 481
 482        frame->ccid.type = PN533_ACR122_PC_TO_RDR_ESCAPE;
 483        frame->ccid.datalen = sizeof(frame->apdu) + 1; /* sizeof(apdu_hdr) +
 484                                                          sizeof(datalen) */
 485        frame->ccid.slot = 0;
 486        frame->ccid.seq = 0;
 487        frame->ccid.params[0] = 0;
 488        frame->ccid.params[1] = 0;
 489        frame->ccid.params[2] = 0;
 490
 491        frame->data[0] = PN533_STD_FRAME_DIR_OUT;
 492        frame->data[1] = cmd_code;
 493        frame->datalen = 2;  /* data[0] + data[1] */
 494
 495        frame->apdu.class = 0xFF;
 496        frame->apdu.ins = 0;
 497        frame->apdu.p1 = 0;
 498        frame->apdu.p2 = 0;
 499}
 500
 501static void pn533_acr122_tx_frame_finish(void *_frame)
 502{
 503        struct pn533_acr122_tx_frame *frame = _frame;
 504
 505        frame->ccid.datalen += frame->datalen;
 506}
 507
 508static void pn533_acr122_tx_update_payload_len(void *_frame, int len)
 509{
 510        struct pn533_acr122_tx_frame *frame = _frame;
 511
 512        frame->datalen += len;
 513}
 514
 515static bool pn533_acr122_is_rx_frame_valid(void *_frame, struct pn533 *dev)
 516{
 517        struct pn533_acr122_rx_frame *frame = _frame;
 518
 519        if (frame->ccid.type != 0x83)
 520                return false;
 521
 522        if (frame->data[frame->ccid.datalen - 2] == 0x63)
 523                return false;
 524
 525        return true;
 526}
 527
 528static int pn533_acr122_rx_frame_size(void *frame)
 529{
 530        struct pn533_acr122_rx_frame *f = frame;
 531
 532        /* f->ccid.datalen already includes tail length */
 533        return sizeof(struct pn533_acr122_rx_frame) + f->ccid.datalen;
 534}
 535
 536static u8 pn533_acr122_get_cmd_code(void *frame)
 537{
 538        struct pn533_acr122_rx_frame *f = frame;
 539
 540        return PN533_FRAME_CMD(f);
 541}
 542
 543static struct pn533_frame_ops pn533_acr122_frame_ops = {
 544        .tx_frame_init = pn533_acr122_tx_frame_init,
 545        .tx_frame_finish = pn533_acr122_tx_frame_finish,
 546        .tx_update_payload_len = pn533_acr122_tx_update_payload_len,
 547        .tx_header_len = PN533_ACR122_TX_FRAME_HEADER_LEN,
 548        .tx_tail_len = PN533_ACR122_TX_FRAME_TAIL_LEN,
 549
 550        .rx_is_frame_valid = pn533_acr122_is_rx_frame_valid,
 551        .rx_header_len = PN533_ACR122_RX_FRAME_HEADER_LEN,
 552        .rx_tail_len = PN533_ACR122_RX_FRAME_TAIL_LEN,
 553        .rx_frame_size = pn533_acr122_rx_frame_size,
 554
 555        .max_payload_len = PN533_ACR122_FRAME_MAX_PAYLOAD_LEN,
 556        .get_cmd_code = pn533_acr122_get_cmd_code,
 557};
 558
 559/* The rule: value(high byte) + value(low byte) + checksum = 0 */
 560static inline u8 pn533_ext_checksum(u16 value)
 561{
 562        return ~(u8)(((value & 0xFF00) >> 8) + (u8)(value & 0xFF)) + 1;
 563}
 564
 565/* The rule: value + checksum = 0 */
 566static inline u8 pn533_std_checksum(u8 value)
 567{
 568        return ~value + 1;
 569}
 570
 571/* The rule: sum(data elements) + checksum = 0 */
 572static u8 pn533_std_data_checksum(u8 *data, int datalen)
 573{
 574        u8 sum = 0;
 575        int i;
 576
 577        for (i = 0; i < datalen; i++)
 578                sum += data[i];
 579
 580        return pn533_std_checksum(sum);
 581}
 582
 583static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code)
 584{
 585        struct pn533_std_frame *frame = _frame;
 586
 587        frame->preamble = 0;
 588        frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF);
 589        PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT;
 590        PN533_FRAME_CMD(frame) = cmd_code;
 591        frame->datalen = 2;
 592}
 593
 594static void pn533_std_tx_frame_finish(void *_frame)
 595{
 596        struct pn533_std_frame *frame = _frame;
 597
 598        frame->datalen_checksum = pn533_std_checksum(frame->datalen);
 599
 600        PN533_STD_FRAME_CHECKSUM(frame) =
 601                pn533_std_data_checksum(frame->data, frame->datalen);
 602
 603        PN533_STD_FRAME_POSTAMBLE(frame) = 0;
 604}
 605
 606static void pn533_std_tx_update_payload_len(void *_frame, int len)
 607{
 608        struct pn533_std_frame *frame = _frame;
 609
 610        frame->datalen += len;
 611}
 612
 613static bool pn533_std_rx_frame_is_valid(void *_frame, struct pn533 *dev)
 614{
 615        u8 checksum;
 616        struct pn533_std_frame *stdf = _frame;
 617
 618        if (stdf->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
 619                return false;
 620
 621        if (likely(!PN533_STD_IS_EXTENDED(stdf))) {
 622                /* Standard frame code */
 623                dev->ops->rx_header_len = PN533_STD_FRAME_HEADER_LEN;
 624
 625                checksum = pn533_std_checksum(stdf->datalen);
 626                if (checksum != stdf->datalen_checksum)
 627                        return false;
 628
 629                checksum = pn533_std_data_checksum(stdf->data, stdf->datalen);
 630                if (checksum != PN533_STD_FRAME_CHECKSUM(stdf))
 631                        return false;
 632        } else {
 633                /* Extended */
 634                struct pn533_ext_frame *eif = _frame;
 635
 636                dev->ops->rx_header_len = PN533_EXT_FRAME_HEADER_LEN;
 637
 638                checksum = pn533_ext_checksum(be16_to_cpu(eif->datalen));
 639                if (checksum != eif->datalen_checksum)
 640                        return false;
 641
 642                /* check data checksum */
 643                checksum = pn533_std_data_checksum(eif->data,
 644                                                   be16_to_cpu(eif->datalen));
 645                if (checksum != PN533_EXT_FRAME_CHECKSUM(eif))
 646                        return false;
 647        }
 648
 649        return true;
 650}
 651
 652static bool pn533_std_rx_frame_is_ack(struct pn533_std_frame *frame)
 653{
 654        if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
 655                return false;
 656
 657        if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
 658                return false;
 659
 660        return true;
 661}
 662
 663static inline int pn533_std_rx_frame_size(void *frame)
 664{
 665        struct pn533_std_frame *f = frame;
 666
 667        /* check for Extended Information frame */
 668        if (PN533_STD_IS_EXTENDED(f)) {
 669                struct pn533_ext_frame *eif = frame;
 670
 671                return sizeof(struct pn533_ext_frame)
 672                        + be16_to_cpu(eif->datalen) + PN533_STD_FRAME_TAIL_LEN;
 673        }
 674
 675        return sizeof(struct pn533_std_frame) + f->datalen +
 676               PN533_STD_FRAME_TAIL_LEN;
 677}
 678
 679static u8 pn533_std_get_cmd_code(void *frame)
 680{
 681        struct pn533_std_frame *f = frame;
 682        struct pn533_ext_frame *eif = frame;
 683
 684        if (PN533_STD_IS_EXTENDED(f))
 685                return PN533_FRAME_CMD(eif);
 686        else
 687                return PN533_FRAME_CMD(f);
 688}
 689
 690static struct pn533_frame_ops pn533_std_frame_ops = {
 691        .tx_frame_init = pn533_std_tx_frame_init,
 692        .tx_frame_finish = pn533_std_tx_frame_finish,
 693        .tx_update_payload_len = pn533_std_tx_update_payload_len,
 694        .tx_header_len = PN533_STD_FRAME_HEADER_LEN,
 695        .tx_tail_len = PN533_STD_FRAME_TAIL_LEN,
 696
 697        .rx_is_frame_valid = pn533_std_rx_frame_is_valid,
 698        .rx_frame_size = pn533_std_rx_frame_size,
 699        .rx_header_len = PN533_STD_FRAME_HEADER_LEN,
 700        .rx_tail_len = PN533_STD_FRAME_TAIL_LEN,
 701
 702        .max_payload_len =  PN533_STD_FRAME_MAX_PAYLOAD_LEN,
 703        .get_cmd_code = pn533_std_get_cmd_code,
 704};
 705
 706static bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
 707{
 708        return (dev->ops->get_cmd_code(frame) ==
 709                                PN533_CMD_RESPONSE(dev->cmd->code));
 710}
 711
 712static void pn533_recv_response(struct urb *urb)
 713{
 714        struct pn533 *dev = urb->context;
 715        struct pn533_cmd *cmd = dev->cmd;
 716        u8 *in_frame;
 717
 718        cmd->status = urb->status;
 719
 720        switch (urb->status) {
 721        case 0:
 722                break; /* success */
 723        case -ECONNRESET:
 724        case -ENOENT:
 725                nfc_dev_dbg(&dev->interface->dev,
 726                            "The urb has been canceled (status %d)",
 727                            urb->status);
 728                goto sched_wq;
 729        case -ESHUTDOWN:
 730        default:
 731                nfc_dev_err(&dev->interface->dev,
 732                            "Urb failure (status %d)", urb->status);
 733                goto sched_wq;
 734        }
 735
 736        in_frame = dev->in_urb->transfer_buffer;
 737
 738        nfc_dev_dbg(&dev->interface->dev, "Received a frame.");
 739        print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, in_frame,
 740                             dev->ops->rx_frame_size(in_frame), false);
 741
 742        if (!dev->ops->rx_is_frame_valid(in_frame, dev)) {
 743                nfc_dev_err(&dev->interface->dev, "Received an invalid frame");
 744                cmd->status = -EIO;
 745                goto sched_wq;
 746        }
 747
 748        if (!pn533_rx_frame_is_cmd_response(dev, in_frame)) {
 749                nfc_dev_err(&dev->interface->dev,
 750                            "It it not the response to the last command");
 751                cmd->status = -EIO;
 752                goto sched_wq;
 753        }
 754
 755sched_wq:
 756        queue_work(dev->wq, &dev->cmd_complete_work);
 757}
 758
 759static int pn533_submit_urb_for_response(struct pn533 *dev, gfp_t flags)
 760{
 761        dev->in_urb->complete = pn533_recv_response;
 762
 763        return usb_submit_urb(dev->in_urb, flags);
 764}
 765
 766static void pn533_recv_ack(struct urb *urb)
 767{
 768        struct pn533 *dev = urb->context;
 769        struct pn533_cmd *cmd = dev->cmd;
 770        struct pn533_std_frame *in_frame;
 771        int rc;
 772
 773        cmd->status = urb->status;
 774
 775        switch (urb->status) {
 776        case 0:
 777                break; /* success */
 778        case -ECONNRESET:
 779        case -ENOENT:
 780                nfc_dev_dbg(&dev->interface->dev,
 781                            "The urb has been stopped (status %d)",
 782                            urb->status);
 783                goto sched_wq;
 784        case -ESHUTDOWN:
 785        default:
 786                nfc_dev_err(&dev->interface->dev,
 787                            "Urb failure (status %d)", urb->status);
 788                goto sched_wq;
 789        }
 790
 791        in_frame = dev->in_urb->transfer_buffer;
 792
 793        if (!pn533_std_rx_frame_is_ack(in_frame)) {
 794                nfc_dev_err(&dev->interface->dev, "Received an invalid ack");
 795                cmd->status = -EIO;
 796                goto sched_wq;
 797        }
 798
 799        rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
 800        if (rc) {
 801                nfc_dev_err(&dev->interface->dev,
 802                            "usb_submit_urb failed with result %d", rc);
 803                cmd->status = rc;
 804                goto sched_wq;
 805        }
 806
 807        return;
 808
 809sched_wq:
 810        queue_work(dev->wq, &dev->cmd_complete_work);
 811}
 812
 813static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags)
 814{
 815        dev->in_urb->complete = pn533_recv_ack;
 816
 817        return usb_submit_urb(dev->in_urb, flags);
 818}
 819
 820static int pn533_send_ack(struct pn533 *dev, gfp_t flags)
 821{
 822        u8 ack[PN533_STD_FRAME_ACK_SIZE] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
 823        /* spec 7.1.1.3:  Preamble, SoPC (2), ACK Code (2), Postamble */
 824        int rc;
 825
 826        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
 827
 828        dev->out_urb->transfer_buffer = ack;
 829        dev->out_urb->transfer_buffer_length = sizeof(ack);
 830        rc = usb_submit_urb(dev->out_urb, flags);
 831
 832        return rc;
 833}
 834
 835static int __pn533_send_frame_async(struct pn533 *dev,
 836                                        struct sk_buff *out,
 837                                        struct sk_buff *in,
 838                                        int in_len)
 839{
 840        int rc;
 841
 842        dev->out_urb->transfer_buffer = out->data;
 843        dev->out_urb->transfer_buffer_length = out->len;
 844
 845        dev->in_urb->transfer_buffer = in->data;
 846        dev->in_urb->transfer_buffer_length = in_len;
 847
 848        print_hex_dump_debug("PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
 849                             out->data, out->len, false);
 850
 851        rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
 852        if (rc)
 853                return rc;
 854
 855        if (dev->protocol_type == PN533_PROTO_REQ_RESP) {
 856                /* request for response for sent packet directly */
 857                rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
 858                if (rc)
 859                        goto error;
 860        } else if (dev->protocol_type == PN533_PROTO_REQ_ACK_RESP) {
 861                /* request for ACK if that's the case */
 862                rc = pn533_submit_urb_for_ack(dev, GFP_KERNEL);
 863                if (rc)
 864                        goto error;
 865        }
 866
 867        return 0;
 868
 869error:
 870        usb_unlink_urb(dev->out_urb);
 871        return rc;
 872}
 873
 874static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
 875                                  struct sk_buff *skb)
 876{
 877        /* payload is already there, just update datalen */
 878        int payload_len = skb->len;
 879        struct pn533_frame_ops *ops = dev->ops;
 880
 881
 882        skb_push(skb, ops->tx_header_len);
 883        skb_put(skb, ops->tx_tail_len);
 884
 885        ops->tx_frame_init(skb->data, cmd_code);
 886        ops->tx_update_payload_len(skb->data, payload_len);
 887        ops->tx_frame_finish(skb->data);
 888}
 889
 890static int pn533_send_async_complete(struct pn533 *dev)
 891{
 892        struct pn533_cmd *cmd = dev->cmd;
 893        int status = cmd->status;
 894
 895        struct sk_buff *req = cmd->req;
 896        struct sk_buff *resp = cmd->resp;
 897
 898        int rc;
 899
 900        dev_kfree_skb(req);
 901
 902        if (status < 0) {
 903                rc = cmd->complete_cb(dev, cmd->complete_cb_context,
 904                                      ERR_PTR(status));
 905                dev_kfree_skb(resp);
 906                goto done;
 907        }
 908
 909        skb_put(resp, dev->ops->rx_frame_size(resp->data));
 910        skb_pull(resp, dev->ops->rx_header_len);
 911        skb_trim(resp, resp->len - dev->ops->rx_tail_len);
 912
 913        rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp);
 914
 915done:
 916        kfree(cmd);
 917        dev->cmd = NULL;
 918        return rc;
 919}
 920
 921static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
 922                              struct sk_buff *req, struct sk_buff *resp,
 923                              int resp_len,
 924                              pn533_send_async_complete_t complete_cb,
 925                              void *complete_cb_context)
 926{
 927        struct pn533_cmd *cmd;
 928        int rc = 0;
 929
 930        nfc_dev_dbg(&dev->interface->dev, "Sending command 0x%x", cmd_code);
 931
 932        cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 933        if (!cmd)
 934                return -ENOMEM;
 935
 936        cmd->code = cmd_code;
 937        cmd->req = req;
 938        cmd->resp = resp;
 939        cmd->resp_len = resp_len;
 940        cmd->complete_cb = complete_cb;
 941        cmd->complete_cb_context = complete_cb_context;
 942
 943        pn533_build_cmd_frame(dev, cmd_code, req);
 944
 945        mutex_lock(&dev->cmd_lock);
 946
 947        if (!dev->cmd_pending) {
 948                rc = __pn533_send_frame_async(dev, req, resp, resp_len);
 949                if (rc)
 950                        goto error;
 951
 952                dev->cmd_pending = 1;
 953                dev->cmd = cmd;
 954                goto unlock;
 955        }
 956
 957        nfc_dev_dbg(&dev->interface->dev, "%s Queueing command 0x%x", __func__,
 958                    cmd_code);
 959
 960        INIT_LIST_HEAD(&cmd->queue);
 961        list_add_tail(&cmd->queue, &dev->cmd_queue);
 962
 963        goto unlock;
 964
 965error:
 966        kfree(cmd);
 967unlock:
 968        mutex_unlock(&dev->cmd_lock);
 969        return rc;
 970}
 971
 972static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
 973                                 struct sk_buff *req,
 974                                 pn533_send_async_complete_t complete_cb,
 975                                 void *complete_cb_context)
 976{
 977        struct sk_buff *resp;
 978        int rc;
 979        int  resp_len = dev->ops->rx_header_len +
 980                        dev->ops->max_payload_len +
 981                        dev->ops->rx_tail_len;
 982
 983        resp = nfc_alloc_recv_skb(resp_len, GFP_KERNEL);
 984        if (!resp)
 985                return -ENOMEM;
 986
 987        rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
 988                                complete_cb_context);
 989        if (rc)
 990                dev_kfree_skb(resp);
 991
 992        return rc;
 993}
 994
 995static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
 996                                struct sk_buff *req,
 997                                pn533_send_async_complete_t complete_cb,
 998                                void *complete_cb_context)
 999{
1000        struct sk_buff *resp;
1001        int rc;
1002        int  resp_len = dev->ops->rx_header_len +
1003                        dev->ops->max_payload_len +
1004                        dev->ops->rx_tail_len;
1005
1006        resp = alloc_skb(resp_len, GFP_KERNEL);
1007        if (!resp)
1008                return -ENOMEM;
1009
1010        rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
1011                                complete_cb_context);
1012        if (rc)
1013                dev_kfree_skb(resp);
1014
1015        return rc;
1016}
1017
1018/*
1019 * pn533_send_cmd_direct_async
1020 *
1021 * The function sends a piority cmd directly to the chip omiting the cmd
1022 * queue. It's intended to be used by chaining mechanism of received responses
1023 * where the host has to request every single chunk of data before scheduling
1024 * next cmd from the queue.
1025 */
1026static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
1027                                       struct sk_buff *req,
1028                                       pn533_send_async_complete_t complete_cb,
1029                                       void *complete_cb_context)
1030{
1031        struct sk_buff *resp;
1032        struct pn533_cmd *cmd;
1033        int rc;
1034        int resp_len = dev->ops->rx_header_len +
1035                       dev->ops->max_payload_len +
1036                       dev->ops->rx_tail_len;
1037
1038        resp = alloc_skb(resp_len, GFP_KERNEL);
1039        if (!resp)
1040                return -ENOMEM;
1041
1042        cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
1043        if (!cmd) {
1044                dev_kfree_skb(resp);
1045                return -ENOMEM;
1046        }
1047
1048        cmd->code = cmd_code;
1049        cmd->req = req;
1050        cmd->resp = resp;
1051        cmd->resp_len = resp_len;
1052        cmd->complete_cb = complete_cb;
1053        cmd->complete_cb_context = complete_cb_context;
1054
1055        pn533_build_cmd_frame(dev, cmd_code, req);
1056
1057        rc = __pn533_send_frame_async(dev, req, resp, resp_len);
1058        if (rc < 0) {
1059                dev_kfree_skb(resp);
1060                kfree(cmd);
1061        } else {
1062                dev->cmd = cmd;
1063        }
1064
1065        return rc;
1066}
1067
1068static void pn533_wq_cmd_complete(struct work_struct *work)
1069{
1070        struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
1071        int rc;
1072
1073        rc = pn533_send_async_complete(dev);
1074        if (rc != -EINPROGRESS)
1075                queue_work(dev->wq, &dev->cmd_work);
1076}
1077
1078static void pn533_wq_cmd(struct work_struct *work)
1079{
1080        struct pn533 *dev = container_of(work, struct pn533, cmd_work);
1081        struct pn533_cmd *cmd;
1082        int rc;
1083
1084        mutex_lock(&dev->cmd_lock);
1085
1086        if (list_empty(&dev->cmd_queue)) {
1087                dev->cmd_pending = 0;
1088                mutex_unlock(&dev->cmd_lock);
1089                return;
1090        }
1091
1092        cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
1093
1094        list_del(&cmd->queue);
1095
1096        mutex_unlock(&dev->cmd_lock);
1097
1098        rc = __pn533_send_frame_async(dev, cmd->req, cmd->resp, cmd->resp_len);
1099        if (rc < 0) {
1100                dev_kfree_skb(cmd->req);
1101                dev_kfree_skb(cmd->resp);
1102                kfree(cmd);
1103                return;
1104        }
1105
1106        dev->cmd = cmd;
1107}
1108
1109struct pn533_sync_cmd_response {
1110        struct sk_buff *resp;
1111        struct completion done;
1112};
1113
1114static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
1115                                    struct sk_buff *resp)
1116{
1117        struct pn533_sync_cmd_response *arg = _arg;
1118
1119        arg->resp = resp;
1120        complete(&arg->done);
1121
1122        return 0;
1123}
1124
1125/*  pn533_send_cmd_sync
1126 *
1127 *  Please note the req parameter is freed inside the function to
1128 *  limit a number of return value interpretations by the caller.
1129 *
1130 *  1. negative in case of error during TX path -> req should be freed
1131 *
1132 *  2. negative in case of error during RX path -> req should not be freed
1133 *     as it's been already freed at the begining of RX path by
1134 *     async_complete_cb.
1135 *
1136 *  3. valid pointer in case of succesfult RX path
1137 *
1138 *  A caller has to check a return value with IS_ERR macro. If the test pass,
1139 *  the returned pointer is valid.
1140 *
1141 * */
1142static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
1143                                               struct sk_buff *req)
1144{
1145        int rc;
1146        struct pn533_sync_cmd_response arg;
1147
1148        init_completion(&arg.done);
1149
1150        rc = pn533_send_cmd_async(dev, cmd_code, req,
1151                                  pn533_send_sync_complete, &arg);
1152        if (rc) {
1153                dev_kfree_skb(req);
1154                return ERR_PTR(rc);
1155        }
1156
1157        wait_for_completion(&arg.done);
1158
1159        return arg.resp;
1160}
1161
1162static void pn533_send_complete(struct urb *urb)
1163{
1164        struct pn533 *dev = urb->context;
1165
1166        switch (urb->status) {
1167        case 0:
1168                break; /* success */
1169        case -ECONNRESET:
1170        case -ENOENT:
1171                nfc_dev_dbg(&dev->interface->dev,
1172                            "The urb has been stopped (status %d)",
1173                            urb->status);
1174                break;
1175        case -ESHUTDOWN:
1176        default:
1177                nfc_dev_err(&dev->interface->dev,
1178                            "Urb failure (status %d)", urb->status);
1179        }
1180}
1181
1182static void pn533_abort_cmd(struct pn533 *dev, gfp_t flags)
1183{
1184        /* ACR122U does not support any command which aborts last
1185         * issued command i.e. as ACK for standard PN533. Additionally,
1186         * it behaves stange, sending broken or incorrect responses,
1187         * when we cancel urb before the chip will send response.
1188         */
1189        if (dev->device_type == PN533_DEVICE_ACR122U)
1190                return;
1191
1192        /* An ack will cancel the last issued command */
1193        pn533_send_ack(dev, flags);
1194
1195        /* cancel the urb request */
1196        usb_kill_urb(dev->in_urb);
1197}
1198
1199static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
1200{
1201        struct sk_buff *skb;
1202
1203        skb = alloc_skb(dev->ops->tx_header_len +
1204                        size +
1205                        dev->ops->tx_tail_len, GFP_KERNEL);
1206
1207        if (skb)
1208                skb_reserve(skb, dev->ops->tx_header_len);
1209
1210        return skb;
1211}
1212
1213struct pn533_target_type_a {
1214        __be16 sens_res;
1215        u8 sel_res;
1216        u8 nfcid_len;
1217        u8 nfcid_data[];
1218} __packed;
1219
1220
1221#define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
1222#define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
1223#define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
1224
1225#define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
1226#define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
1227
1228#define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
1229#define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
1230
1231#define PN533_TYPE_A_SEL_PROT_MIFARE 0
1232#define PN533_TYPE_A_SEL_PROT_ISO14443 1
1233#define PN533_TYPE_A_SEL_PROT_DEP 2
1234#define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
1235
1236static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
1237                                                        int target_data_len)
1238{
1239        u8 ssd;
1240        u8 platconf;
1241
1242        if (target_data_len < sizeof(struct pn533_target_type_a))
1243                return false;
1244
1245        /* The lenght check of nfcid[] and ats[] are not being performed because
1246           the values are not being used */
1247
1248        /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1249        ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
1250        platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
1251
1252        if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1253             platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1254            (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1255             platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1256                return false;
1257
1258        /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
1259        if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
1260                return false;
1261
1262        return true;
1263}
1264
1265static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
1266                                                        int tgt_data_len)
1267{
1268        struct pn533_target_type_a *tgt_type_a;
1269
1270        tgt_type_a = (struct pn533_target_type_a *)tgt_data;
1271
1272        if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
1273                return -EPROTO;
1274
1275        switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
1276        case PN533_TYPE_A_SEL_PROT_MIFARE:
1277                nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
1278                break;
1279        case PN533_TYPE_A_SEL_PROT_ISO14443:
1280                nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
1281                break;
1282        case PN533_TYPE_A_SEL_PROT_DEP:
1283                nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1284                break;
1285        case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
1286                nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
1287                                                        NFC_PROTO_NFC_DEP_MASK;
1288                break;
1289        }
1290
1291        nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
1292        nfc_tgt->sel_res = tgt_type_a->sel_res;
1293        nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
1294        memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
1295
1296        return 0;
1297}
1298
1299struct pn533_target_felica {
1300        u8 pol_res;
1301        u8 opcode;
1302        u8 nfcid2[NFC_NFCID2_MAXSIZE];
1303        u8 pad[8];
1304        /* optional */
1305        u8 syst_code[];
1306} __packed;
1307
1308#define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
1309#define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
1310
1311static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
1312                                                        int target_data_len)
1313{
1314        if (target_data_len < sizeof(struct pn533_target_felica))
1315                return false;
1316
1317        if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
1318                return false;
1319
1320        return true;
1321}
1322
1323static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
1324                                                        int tgt_data_len)
1325{
1326        struct pn533_target_felica *tgt_felica;
1327
1328        tgt_felica = (struct pn533_target_felica *)tgt_data;
1329
1330        if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
1331                return -EPROTO;
1332
1333        if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
1334            (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
1335                nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1336        else
1337                nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
1338
1339        memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
1340        nfc_tgt->sensf_res_len = 9;
1341
1342        memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
1343        nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
1344
1345        return 0;
1346}
1347
1348struct pn533_target_jewel {
1349        __be16 sens_res;
1350        u8 jewelid[4];
1351} __packed;
1352
1353static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
1354                                                        int target_data_len)
1355{
1356        u8 ssd;
1357        u8 platconf;
1358
1359        if (target_data_len < sizeof(struct pn533_target_jewel))
1360                return false;
1361
1362        /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1363        ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
1364        platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
1365
1366        if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1367             platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1368            (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1369             platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1370                return false;
1371
1372        return true;
1373}
1374
1375static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
1376                                                        int tgt_data_len)
1377{
1378        struct pn533_target_jewel *tgt_jewel;
1379
1380        tgt_jewel = (struct pn533_target_jewel *)tgt_data;
1381
1382        if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
1383                return -EPROTO;
1384
1385        nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
1386        nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
1387        nfc_tgt->nfcid1_len = 4;
1388        memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
1389
1390        return 0;
1391}
1392
1393struct pn533_type_b_prot_info {
1394        u8 bitrate;
1395        u8 fsci_type;
1396        u8 fwi_adc_fo;
1397} __packed;
1398
1399#define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
1400#define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
1401#define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
1402
1403struct pn533_type_b_sens_res {
1404        u8 opcode;
1405        u8 nfcid[4];
1406        u8 appdata[4];
1407        struct pn533_type_b_prot_info prot_info;
1408} __packed;
1409
1410#define PN533_TYPE_B_OPC_SENSB_RES 0x50
1411
1412struct pn533_target_type_b {
1413        struct pn533_type_b_sens_res sensb_res;
1414        u8 attrib_res_len;
1415        u8 attrib_res[];
1416} __packed;
1417
1418static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
1419                                                        int target_data_len)
1420{
1421        if (target_data_len < sizeof(struct pn533_target_type_b))
1422                return false;
1423
1424        if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
1425                return false;
1426
1427        if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
1428                                                PN533_TYPE_B_PROT_TYPE_RFU_MASK)
1429                return false;
1430
1431        return true;
1432}
1433
1434static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
1435                                                        int tgt_data_len)
1436{
1437        struct pn533_target_type_b *tgt_type_b;
1438
1439        tgt_type_b = (struct pn533_target_type_b *)tgt_data;
1440
1441        if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
1442                return -EPROTO;
1443
1444        nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
1445
1446        return 0;
1447}
1448
1449static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
1450                              int tgdata_len)
1451{
1452        struct nfc_target nfc_tgt;
1453        int rc;
1454
1455        nfc_dev_dbg(&dev->interface->dev, "%s - modulation=%d", __func__,
1456                    dev->poll_mod_curr);
1457
1458        if (tg != 1)
1459                return -EPROTO;
1460
1461        memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1462
1463        switch (dev->poll_mod_curr) {
1464        case PN533_POLL_MOD_106KBPS_A:
1465                rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
1466                break;
1467        case PN533_POLL_MOD_212KBPS_FELICA:
1468        case PN533_POLL_MOD_424KBPS_FELICA:
1469                rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
1470                break;
1471        case PN533_POLL_MOD_106KBPS_JEWEL:
1472                rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
1473                break;
1474        case PN533_POLL_MOD_847KBPS_B:
1475                rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
1476                break;
1477        default:
1478                nfc_dev_err(&dev->interface->dev,
1479                            "Unknown current poll modulation");
1480                return -EPROTO;
1481        }
1482
1483        if (rc)
1484                return rc;
1485
1486        if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1487                nfc_dev_dbg(&dev->interface->dev,
1488                            "The Tg found doesn't have the desired protocol");
1489                return -EAGAIN;
1490        }
1491
1492        nfc_dev_dbg(&dev->interface->dev,
1493                    "Target found - supported protocols: 0x%x",
1494                    nfc_tgt.supported_protocols);
1495
1496        dev->tgt_available_prots = nfc_tgt.supported_protocols;
1497
1498        nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1499
1500        return 0;
1501}
1502
1503static inline void pn533_poll_next_mod(struct pn533 *dev)
1504{
1505        dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
1506}
1507
1508static void pn533_poll_reset_mod_list(struct pn533 *dev)
1509{
1510        dev->poll_mod_count = 0;
1511}
1512
1513static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
1514{
1515        dev->poll_mod_active[dev->poll_mod_count] =
1516                (struct pn533_poll_modulations *)&poll_mod[mod_index];
1517        dev->poll_mod_count++;
1518}
1519
1520static void pn533_poll_create_mod_list(struct pn533 *dev,
1521                                       u32 im_protocols, u32 tm_protocols)
1522{
1523        pn533_poll_reset_mod_list(dev);
1524
1525        if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
1526            (im_protocols & NFC_PROTO_ISO14443_MASK) ||
1527            (im_protocols & NFC_PROTO_NFC_DEP_MASK))
1528                pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
1529
1530        if (im_protocols & NFC_PROTO_FELICA_MASK ||
1531            im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1532                pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
1533                pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
1534        }
1535
1536        if (im_protocols & NFC_PROTO_JEWEL_MASK)
1537                pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
1538
1539        if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1540                pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
1541
1542        if (tm_protocols)
1543                pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
1544}
1545
1546static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
1547{
1548        u8 nbtg, tg, *tgdata;
1549        int rc, tgdata_len;
1550
1551        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1552
1553        nbtg = resp->data[0];
1554        tg = resp->data[1];
1555        tgdata = &resp->data[2];
1556        tgdata_len = resp->len - 2;  /* nbtg + tg */
1557
1558        if (nbtg) {
1559                rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1560
1561                /* We must stop the poll after a valid target found */
1562                if (rc == 0) {
1563                        pn533_poll_reset_mod_list(dev);
1564                        return 0;
1565                }
1566        }
1567
1568        return -EAGAIN;
1569}
1570
1571static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1572{
1573        struct sk_buff *skb;
1574        u8 *felica, *nfcid3, *gb;
1575
1576        u8 *gbytes = dev->gb;
1577        size_t gbytes_len = dev->gb_len;
1578
1579        u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1580                                0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1581                                0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1582                                0xff, 0xff}; /* System code */
1583
1584        u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1585                               0x0, 0x0, 0x0,
1586                               0x40}; /* SEL_RES for DEP */
1587
1588        unsigned int skb_len = 36 + /* mode (1), mifare (6),
1589                                       felica (18), nfcid3 (10), gb_len (1) */
1590                               gbytes_len +
1591                               1;  /* len Tk*/
1592
1593        skb = pn533_alloc_skb(dev, skb_len);
1594        if (!skb)
1595                return NULL;
1596
1597        /* DEP support only */
1598        *skb_put(skb, 1) = PN533_INIT_TARGET_DEP;
1599
1600        /* MIFARE params */
1601        memcpy(skb_put(skb, 6), mifare_params, 6);
1602
1603        /* Felica params */
1604        felica = skb_put(skb, 18);
1605        memcpy(felica, felica_params, 18);
1606        get_random_bytes(felica + 2, 6);
1607
1608        /* NFCID3 */
1609        nfcid3 = skb_put(skb, 10);
1610        memset(nfcid3, 0, 10);
1611        memcpy(nfcid3, felica, 8);
1612
1613        /* General bytes */
1614        *skb_put(skb, 1) = gbytes_len;
1615
1616        gb = skb_put(skb, gbytes_len);
1617        memcpy(gb, gbytes, gbytes_len);
1618
1619        /* Len Tk */
1620        *skb_put(skb, 1) = 0;
1621
1622        return skb;
1623}
1624
1625#define PN533_CMD_DATAEXCH_HEAD_LEN 1
1626#define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
1627static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1628                                      struct sk_buff *resp)
1629{
1630        u8 status;
1631
1632        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1633
1634        if (IS_ERR(resp))
1635                return PTR_ERR(resp);
1636
1637        status = resp->data[0];
1638        skb_pull(resp, sizeof(status));
1639
1640        if (status != 0) {
1641                nfc_tm_deactivated(dev->nfc_dev);
1642                dev->tgt_mode = 0;
1643                dev_kfree_skb(resp);
1644                return 0;
1645        }
1646
1647        return nfc_tm_data_received(dev->nfc_dev, resp);
1648}
1649
1650static void pn533_wq_tg_get_data(struct work_struct *work)
1651{
1652        struct pn533 *dev = container_of(work, struct pn533, tg_work);
1653
1654        struct sk_buff *skb;
1655        int rc;
1656
1657        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1658
1659        skb = pn533_alloc_skb(dev, 0);
1660        if (!skb)
1661                return;
1662
1663        rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1664                                   pn533_tm_get_data_complete, NULL);
1665
1666        if (rc < 0)
1667                dev_kfree_skb(skb);
1668
1669        return;
1670}
1671
1672#define ATR_REQ_GB_OFFSET 17
1673static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1674{
1675        u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1676        size_t gb_len;
1677        int rc;
1678
1679        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1680
1681        if (resp->len < ATR_REQ_GB_OFFSET + 1)
1682                return -EINVAL;
1683
1684        mode = resp->data[0];
1685        cmd = &resp->data[1];
1686
1687        nfc_dev_dbg(&dev->interface->dev, "Target mode 0x%x len %d\n",
1688                    mode, resp->len);
1689
1690        if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1691            PN533_INIT_TARGET_RESP_ACTIVE)
1692                comm_mode = NFC_COMM_ACTIVE;
1693
1694        if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0)  /* Only DEP supported */
1695                return -EOPNOTSUPP;
1696
1697        gb = cmd + ATR_REQ_GB_OFFSET;
1698        gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1699
1700        rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1701                              comm_mode, gb, gb_len);
1702        if (rc < 0) {
1703                nfc_dev_err(&dev->interface->dev,
1704                            "Error when signaling target activation");
1705                return rc;
1706        }
1707
1708        dev->tgt_mode = 1;
1709        queue_work(dev->wq, &dev->tg_work);
1710
1711        return 0;
1712}
1713
1714static void pn533_listen_mode_timer(unsigned long data)
1715{
1716        struct pn533 *dev = (struct pn533 *)data;
1717
1718        nfc_dev_dbg(&dev->interface->dev, "Listen mode timeout");
1719
1720        dev->cancel_listen = 1;
1721
1722        pn533_poll_next_mod(dev);
1723
1724        queue_delayed_work(dev->wq, &dev->poll_work,
1725                           msecs_to_jiffies(PN533_POLL_INTERVAL));
1726}
1727
1728static int pn533_rf_complete(struct pn533 *dev, void *arg,
1729                             struct sk_buff *resp)
1730{
1731        int rc = 0;
1732
1733        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1734
1735        if (IS_ERR(resp)) {
1736                rc = PTR_ERR(resp);
1737
1738                nfc_dev_err(&dev->interface->dev, "%s RF setting error %d",
1739                            __func__, rc);
1740
1741                return rc;
1742        }
1743
1744        queue_delayed_work(dev->wq, &dev->poll_work,
1745                           msecs_to_jiffies(PN533_POLL_INTERVAL));
1746
1747        dev_kfree_skb(resp);
1748        return rc;
1749}
1750
1751static void pn533_wq_rf(struct work_struct *work)
1752{
1753        struct pn533 *dev = container_of(work, struct pn533, rf_work);
1754        struct sk_buff *skb;
1755        int rc;
1756
1757        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1758
1759        skb = pn533_alloc_skb(dev, 2);
1760        if (!skb)
1761                return;
1762
1763        *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD;
1764        *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
1765
1766        rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1767                                  pn533_rf_complete, NULL);
1768        if (rc < 0) {
1769                dev_kfree_skb(skb);
1770                nfc_dev_err(&dev->interface->dev, "RF setting error %d", rc);
1771        }
1772
1773        return;
1774}
1775
1776static int pn533_poll_complete(struct pn533 *dev, void *arg,
1777                               struct sk_buff *resp)
1778{
1779        struct pn533_poll_modulations *cur_mod;
1780        int rc;
1781
1782        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1783
1784        if (IS_ERR(resp)) {
1785                rc = PTR_ERR(resp);
1786
1787                nfc_dev_err(&dev->interface->dev, "%s  Poll complete error %d",
1788                            __func__, rc);
1789
1790                if (rc == -ENOENT) {
1791                        if (dev->poll_mod_count != 0)
1792                                return rc;
1793                        else
1794                                goto stop_poll;
1795                } else if (rc < 0) {
1796                        nfc_dev_err(&dev->interface->dev,
1797                                    "Error %d when running poll", rc);
1798                        goto stop_poll;
1799                }
1800        }
1801
1802        cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1803
1804        if (cur_mod->len == 0) { /* Target mode */
1805                del_timer(&dev->listen_timer);
1806                rc = pn533_init_target_complete(dev, resp);
1807                goto done;
1808        }
1809
1810        /* Initiator mode */
1811        rc = pn533_start_poll_complete(dev, resp);
1812        if (!rc)
1813                goto done;
1814
1815        if (!dev->poll_mod_count) {
1816                nfc_dev_dbg(&dev->interface->dev, "Polling has been stopped.");
1817                goto done;
1818        }
1819
1820        pn533_poll_next_mod(dev);
1821        /* Not target found, turn radio off */
1822        queue_work(dev->wq, &dev->rf_work);
1823
1824done:
1825        dev_kfree_skb(resp);
1826        return rc;
1827
1828stop_poll:
1829        nfc_dev_err(&dev->interface->dev, "Polling operation has been stopped");
1830
1831        pn533_poll_reset_mod_list(dev);
1832        dev->poll_protocols = 0;
1833        return rc;
1834}
1835
1836static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1837                                        struct pn533_poll_modulations *mod)
1838{
1839        struct sk_buff *skb;
1840
1841        skb = pn533_alloc_skb(dev, mod->len);
1842        if (!skb)
1843                return NULL;
1844
1845        memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
1846
1847        return skb;
1848}
1849
1850static int pn533_send_poll_frame(struct pn533 *dev)
1851{
1852        struct pn533_poll_modulations *mod;
1853        struct sk_buff *skb;
1854        int rc;
1855        u8 cmd_code;
1856
1857        mod = dev->poll_mod_active[dev->poll_mod_curr];
1858
1859        nfc_dev_dbg(&dev->interface->dev, "%s mod len %d\n",
1860                    __func__, mod->len);
1861
1862        if (mod->len == 0) {  /* Listen mode */
1863                cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1864                skb = pn533_alloc_poll_tg_frame(dev);
1865        } else {  /* Polling mode */
1866                cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
1867                skb = pn533_alloc_poll_in_frame(dev, mod);
1868        }
1869
1870        if (!skb) {
1871                nfc_dev_err(&dev->interface->dev, "Failed to allocate skb.");
1872                return -ENOMEM;
1873        }
1874
1875        rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1876                                  NULL);
1877        if (rc < 0) {
1878                dev_kfree_skb(skb);
1879                nfc_dev_err(&dev->interface->dev, "Polling loop error %d", rc);
1880        }
1881
1882        return rc;
1883}
1884
1885static void pn533_wq_poll(struct work_struct *work)
1886{
1887        struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1888        struct pn533_poll_modulations *cur_mod;
1889        int rc;
1890
1891        cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1892
1893        nfc_dev_dbg(&dev->interface->dev,
1894                    "%s cancel_listen %d modulation len %d",
1895                    __func__, dev->cancel_listen, cur_mod->len);
1896
1897        if (dev->cancel_listen == 1) {
1898                dev->cancel_listen = 0;
1899                pn533_abort_cmd(dev, GFP_ATOMIC);
1900        }
1901
1902        rc = pn533_send_poll_frame(dev);
1903        if (rc)
1904                return;
1905
1906        if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1907                mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1908
1909        return;
1910}
1911
1912static int pn533_start_poll(struct nfc_dev *nfc_dev,
1913                            u32 im_protocols, u32 tm_protocols)
1914{
1915        struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1916        u8 rand_mod;
1917
1918        nfc_dev_dbg(&dev->interface->dev,
1919                    "%s: im protocols 0x%x tm protocols 0x%x",
1920                    __func__, im_protocols, tm_protocols);
1921
1922        if (dev->tgt_active_prot) {
1923                nfc_dev_err(&dev->interface->dev,
1924                            "Cannot poll with a target already activated");
1925                return -EBUSY;
1926        }
1927
1928        if (dev->tgt_mode) {
1929                nfc_dev_err(&dev->interface->dev,
1930                            "Cannot poll while already being activated");
1931                return -EBUSY;
1932        }
1933
1934        if (tm_protocols) {
1935                dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1936                if (dev->gb == NULL)
1937                        tm_protocols = 0;
1938        }
1939
1940        pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1941        dev->poll_protocols = im_protocols;
1942        dev->listen_protocols = tm_protocols;
1943
1944        /* Do not always start polling from the same modulation */
1945        get_random_bytes(&rand_mod, sizeof(rand_mod));
1946        rand_mod %= dev->poll_mod_count;
1947        dev->poll_mod_curr = rand_mod;
1948
1949        return pn533_send_poll_frame(dev);
1950}
1951
1952static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1953{
1954        struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1955
1956        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1957
1958        del_timer(&dev->listen_timer);
1959
1960        if (!dev->poll_mod_count) {
1961                nfc_dev_dbg(&dev->interface->dev,
1962                            "Polling operation was not running");
1963                return;
1964        }
1965
1966        pn533_abort_cmd(dev, GFP_KERNEL);
1967        flush_delayed_work(&dev->poll_work);
1968        pn533_poll_reset_mod_list(dev);
1969}
1970
1971static int pn533_activate_target_nfcdep(struct pn533 *dev)
1972{
1973        struct pn533_cmd_activate_response *rsp;
1974        u16 gt_len;
1975        int rc;
1976
1977        struct sk_buff *skb;
1978        struct sk_buff *resp;
1979
1980        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
1981
1982        skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1983        if (!skb)
1984                return -ENOMEM;
1985
1986        *skb_put(skb, sizeof(u8)) = 1; /* TG */
1987        *skb_put(skb, sizeof(u8)) = 0; /* Next */
1988
1989        resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1990        if (IS_ERR(resp))
1991                return PTR_ERR(resp);
1992
1993        rsp = (struct pn533_cmd_activate_response *)resp->data;
1994        rc = rsp->status & PN533_CMD_RET_MASK;
1995        if (rc != PN533_CMD_RET_SUCCESS) {
1996                nfc_dev_err(&dev->interface->dev,
1997                            "Target activation failed (error 0x%x)", rc);
1998                dev_kfree_skb(resp);
1999                return -EIO;
2000        }
2001
2002        /* ATR_RES general bytes are located at offset 16 */
2003        gt_len = resp->len - 16;
2004        rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
2005
2006        dev_kfree_skb(resp);
2007        return rc;
2008}
2009
2010static int pn533_activate_target(struct nfc_dev *nfc_dev,
2011                                 struct nfc_target *target, u32 protocol)
2012{
2013        struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2014        int rc;
2015
2016        nfc_dev_dbg(&dev->interface->dev, "%s - protocol=%u", __func__,
2017                    protocol);
2018
2019        if (dev->poll_mod_count) {
2020                nfc_dev_err(&dev->interface->dev,
2021                            "Cannot activate while polling");
2022                return -EBUSY;
2023        }
2024
2025        if (dev->tgt_active_prot) {
2026                nfc_dev_err(&dev->interface->dev,
2027                            "There is already an active target");
2028                return -EBUSY;
2029        }
2030
2031        if (!dev->tgt_available_prots) {
2032                nfc_dev_err(&dev->interface->dev,
2033                            "There is no available target to activate");
2034                return -EINVAL;
2035        }
2036
2037        if (!(dev->tgt_available_prots & (1 << protocol))) {
2038                nfc_dev_err(&dev->interface->dev,
2039                            "Target doesn't support requested proto %u",
2040                            protocol);
2041                return -EINVAL;
2042        }
2043
2044        if (protocol == NFC_PROTO_NFC_DEP) {
2045                rc = pn533_activate_target_nfcdep(dev);
2046                if (rc) {
2047                        nfc_dev_err(&dev->interface->dev,
2048                                    "Activating target with DEP failed %d", rc);
2049                        return rc;
2050                }
2051        }
2052
2053        dev->tgt_active_prot = protocol;
2054        dev->tgt_available_prots = 0;
2055
2056        return 0;
2057}
2058
2059static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
2060                                    struct nfc_target *target)
2061{
2062        struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2063
2064        struct sk_buff *skb;
2065        struct sk_buff *resp;
2066
2067        int rc;
2068
2069        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2070
2071        if (!dev->tgt_active_prot) {
2072                nfc_dev_err(&dev->interface->dev, "There is no active target");
2073                return;
2074        }
2075
2076        dev->tgt_active_prot = 0;
2077        skb_queue_purge(&dev->resp_q);
2078
2079        skb = pn533_alloc_skb(dev, sizeof(u8));
2080        if (!skb)
2081                return;
2082
2083        *skb_put(skb, 1) = 1; /* TG*/
2084
2085        resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_RELEASE, skb);
2086        if (IS_ERR(resp))
2087                return;
2088
2089        rc = resp->data[0] & PN533_CMD_RET_MASK;
2090        if (rc != PN533_CMD_RET_SUCCESS)
2091                nfc_dev_err(&dev->interface->dev,
2092                            "Error 0x%x when releasing the target", rc);
2093
2094        dev_kfree_skb(resp);
2095        return;
2096}
2097
2098
2099static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
2100                                         struct sk_buff *resp)
2101{
2102        struct pn533_cmd_jump_dep_response *rsp;
2103        u8 target_gt_len;
2104        int rc;
2105        u8 active = *(u8 *)arg;
2106
2107        kfree(arg);
2108
2109        if (IS_ERR(resp))
2110                return PTR_ERR(resp);
2111
2112        if (dev->tgt_available_prots &&
2113            !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
2114                nfc_dev_err(&dev->interface->dev,
2115                            "The target does not support DEP");
2116                rc =  -EINVAL;
2117                goto error;
2118        }
2119
2120        rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
2121
2122        rc = rsp->status & PN533_CMD_RET_MASK;
2123        if (rc != PN533_CMD_RET_SUCCESS) {
2124                nfc_dev_err(&dev->interface->dev,
2125                            "Bringing DEP link up failed (error 0x%x)", rc);
2126                goto error;
2127        }
2128
2129        if (!dev->tgt_available_prots) {
2130                struct nfc_target nfc_target;
2131
2132                nfc_dev_dbg(&dev->interface->dev, "Creating new target");
2133
2134                nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
2135                nfc_target.nfcid1_len = 10;
2136                memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
2137                rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
2138                if (rc)
2139                        goto error;
2140
2141                dev->tgt_available_prots = 0;
2142        }
2143
2144        dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
2145
2146        /* ATR_RES general bytes are located at offset 17 */
2147        target_gt_len = resp->len - 17;
2148        rc = nfc_set_remote_general_bytes(dev->nfc_dev,
2149                                          rsp->gt, target_gt_len);
2150        if (rc == 0)
2151                rc = nfc_dep_link_is_up(dev->nfc_dev,
2152                                        dev->nfc_dev->targets[0].idx,
2153                                        !active, NFC_RF_INITIATOR);
2154
2155error:
2156        dev_kfree_skb(resp);
2157        return rc;
2158}
2159
2160static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
2161#define PASSIVE_DATA_LEN 5
2162static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
2163                             u8 comm_mode, u8 *gb, size_t gb_len)
2164{
2165        struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2166        struct sk_buff *skb;
2167        int rc, skb_len;
2168        u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
2169
2170        u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
2171
2172        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2173
2174        if (dev->poll_mod_count) {
2175                nfc_dev_err(&dev->interface->dev,
2176                            "Cannot bring the DEP link up while polling");
2177                return -EBUSY;
2178        }
2179
2180        if (dev->tgt_active_prot) {
2181                nfc_dev_err(&dev->interface->dev,
2182                            "There is already an active target");
2183                return -EBUSY;
2184        }
2185
2186        skb_len = 3 + gb_len; /* ActPass + BR + Next */
2187        skb_len += PASSIVE_DATA_LEN;
2188
2189        /* NFCID3 */
2190        skb_len += NFC_NFCID3_MAXSIZE;
2191        if (target && !target->nfcid2_len) {
2192                nfcid3[0] = 0x1;
2193                nfcid3[1] = 0xfe;
2194                get_random_bytes(nfcid3 + 2, 6);
2195        }
2196
2197        skb = pn533_alloc_skb(dev, skb_len);
2198        if (!skb)
2199                return -ENOMEM;
2200
2201        *skb_put(skb, 1) = !comm_mode;  /* ActPass */
2202        *skb_put(skb, 1) = 0x02;  /* 424 kbps */
2203
2204        next = skb_put(skb, 1);  /* Next */
2205        *next = 0;
2206
2207        /* Copy passive data */
2208        memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
2209        *next |= 1;
2210
2211        /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
2212        if (target && target->nfcid2_len)
2213                memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
2214                       target->nfcid2_len);
2215        else
2216                memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
2217                       NFC_NFCID3_MAXSIZE);
2218        *next |= 2;
2219
2220        if (gb != NULL && gb_len > 0) {
2221                memcpy(skb_put(skb, gb_len), gb, gb_len);
2222                *next |= 4; /* We have some Gi */
2223        } else {
2224                *next = 0;
2225        }
2226
2227        arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2228        if (!arg) {
2229                dev_kfree_skb(skb);
2230                return -ENOMEM;
2231        }
2232
2233        *arg = !comm_mode;
2234
2235        pn533_rf_field(dev->nfc_dev, 0);
2236
2237        rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
2238                                  pn533_in_dep_link_up_complete, arg);
2239
2240        if (rc < 0) {
2241                dev_kfree_skb(skb);
2242                kfree(arg);
2243        }
2244
2245        return rc;
2246}
2247
2248static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
2249{
2250        struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2251
2252        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2253
2254        pn533_poll_reset_mod_list(dev);
2255
2256        if (dev->tgt_mode || dev->tgt_active_prot)
2257                pn533_abort_cmd(dev, GFP_KERNEL);
2258
2259        dev->tgt_active_prot = 0;
2260        dev->tgt_mode = 0;
2261
2262        skb_queue_purge(&dev->resp_q);
2263
2264        return 0;
2265}
2266
2267struct pn533_data_exchange_arg {
2268        data_exchange_cb_t cb;
2269        void *cb_context;
2270};
2271
2272static struct sk_buff *pn533_build_response(struct pn533 *dev)
2273{
2274        struct sk_buff *skb, *tmp, *t;
2275        unsigned int skb_len = 0, tmp_len = 0;
2276
2277        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2278
2279        if (skb_queue_empty(&dev->resp_q))
2280                return NULL;
2281
2282        if (skb_queue_len(&dev->resp_q) == 1) {
2283                skb = skb_dequeue(&dev->resp_q);
2284                goto out;
2285        }
2286
2287        skb_queue_walk_safe(&dev->resp_q, tmp, t)
2288                skb_len += tmp->len;
2289
2290        nfc_dev_dbg(&dev->interface->dev, "%s total length %d\n",
2291                    __func__, skb_len);
2292
2293        skb = alloc_skb(skb_len, GFP_KERNEL);
2294        if (skb == NULL)
2295                goto out;
2296
2297        skb_put(skb, skb_len);
2298
2299        skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2300                memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2301                tmp_len += tmp->len;
2302        }
2303
2304out:
2305        skb_queue_purge(&dev->resp_q);
2306
2307        return skb;
2308}
2309
2310static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2311                                        struct sk_buff *resp)
2312{
2313        struct pn533_data_exchange_arg *arg = _arg;
2314        struct sk_buff *skb;
2315        int rc = 0;
2316        u8 status, ret, mi;
2317
2318        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2319
2320        if (IS_ERR(resp)) {
2321                rc = PTR_ERR(resp);
2322                goto _error;
2323        }
2324
2325        status = resp->data[0];
2326        ret = status & PN533_CMD_RET_MASK;
2327        mi = status & PN533_CMD_MI_MASK;
2328
2329        skb_pull(resp, sizeof(status));
2330
2331        if (ret != PN533_CMD_RET_SUCCESS) {
2332                nfc_dev_err(&dev->interface->dev,
2333                            "Exchanging data failed (error 0x%x)", ret);
2334                rc = -EIO;
2335                goto error;
2336        }
2337
2338        skb_queue_tail(&dev->resp_q, resp);
2339
2340        if (mi) {
2341                dev->cmd_complete_mi_arg = arg;
2342                queue_work(dev->wq, &dev->mi_rx_work);
2343                return -EINPROGRESS;
2344        }
2345
2346        /* Prepare for the next round */
2347        if (skb_queue_len(&dev->fragment_skb) > 0) {
2348                dev->cmd_complete_dep_arg = arg;
2349                queue_work(dev->wq, &dev->mi_tx_work);
2350
2351                return -EINPROGRESS;
2352        }
2353
2354        skb = pn533_build_response(dev);
2355        if (!skb)
2356                goto error;
2357
2358        arg->cb(arg->cb_context, skb, 0);
2359        kfree(arg);
2360        return 0;
2361
2362error:
2363        dev_kfree_skb(resp);
2364_error:
2365        skb_queue_purge(&dev->resp_q);
2366        arg->cb(arg->cb_context, NULL, rc);
2367        kfree(arg);
2368        return rc;
2369}
2370
2371/* Split the Tx skb into small chunks */
2372static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2373{
2374        struct sk_buff *frag;
2375        int  frag_size;
2376
2377        do {
2378                /* Remaining size */
2379                if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2380                        frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2381                else
2382                        frag_size = skb->len;
2383
2384                /* Allocate and reserve */
2385                frag = pn533_alloc_skb(dev, frag_size);
2386                if (!frag) {
2387                        skb_queue_purge(&dev->fragment_skb);
2388                        break;
2389                }
2390
2391                /* Reserve the TG/MI byte */
2392                skb_reserve(frag, 1);
2393
2394                /* MI + TG */
2395                if (frag_size  == PN533_CMD_DATAFRAME_MAXLEN)
2396                        *skb_push(frag, sizeof(u8)) = (PN533_CMD_MI_MASK | 1);
2397                else
2398                        *skb_push(frag, sizeof(u8)) =  1; /* TG */
2399
2400                memcpy(skb_put(frag, frag_size), skb->data, frag_size);
2401
2402                /* Reduce the size of incoming buffer */
2403                skb_pull(skb, frag_size);
2404
2405                /* Add this to skb_queue */
2406                skb_queue_tail(&dev->fragment_skb, frag);
2407
2408        } while (skb->len > 0);
2409
2410        dev_kfree_skb(skb);
2411
2412        return skb_queue_len(&dev->fragment_skb);
2413}
2414
2415static int pn533_transceive(struct nfc_dev *nfc_dev,
2416                            struct nfc_target *target, struct sk_buff *skb,
2417                            data_exchange_cb_t cb, void *cb_context)
2418{
2419        struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2420        struct pn533_data_exchange_arg *arg = NULL;
2421        int rc;
2422
2423        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2424
2425        if (!dev->tgt_active_prot) {
2426                nfc_dev_err(&dev->interface->dev,
2427                            "Can't exchange data if there is no active target");
2428                rc = -EINVAL;
2429                goto error;
2430        }
2431
2432        arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2433        if (!arg) {
2434                rc = -ENOMEM;
2435                goto error;
2436        }
2437
2438        arg->cb = cb;
2439        arg->cb_context = cb_context;
2440
2441        switch (dev->device_type) {
2442        case PN533_DEVICE_PASORI:
2443                if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2444                        rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2445                                                   skb,
2446                                                   pn533_data_exchange_complete,
2447                                                   arg);
2448
2449                        break;
2450                }
2451        default:
2452                /* jumbo frame ? */
2453                if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2454                        rc = pn533_fill_fragment_skbs(dev, skb);
2455                        if (rc <= 0)
2456                                goto error;
2457
2458                        skb = skb_dequeue(&dev->fragment_skb);
2459                        if (!skb) {
2460                                rc = -EIO;
2461                                goto error;
2462                        }
2463                } else {
2464                        *skb_push(skb, sizeof(u8)) =  1; /* TG */
2465                }
2466
2467                rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2468                                           skb, pn533_data_exchange_complete,
2469                                           arg);
2470
2471                break;
2472        }
2473
2474        if (rc < 0) /* rc from send_async */
2475                goto error;
2476
2477        return 0;
2478
2479error:
2480        kfree(arg);
2481        dev_kfree_skb(skb);
2482        return rc;
2483}
2484
2485static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2486                                  struct sk_buff *resp)
2487{
2488        u8 status;
2489
2490        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2491
2492        if (IS_ERR(resp))
2493                return PTR_ERR(resp);
2494
2495        status = resp->data[0];
2496
2497        dev_kfree_skb(resp);
2498
2499        if (status != 0) {
2500                nfc_tm_deactivated(dev->nfc_dev);
2501
2502                dev->tgt_mode = 0;
2503
2504                return 0;
2505        }
2506
2507        queue_work(dev->wq, &dev->tg_work);
2508
2509        return 0;
2510}
2511
2512static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2513{
2514        struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2515        int rc;
2516
2517        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2518
2519        if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2520                nfc_dev_err(&dev->interface->dev,
2521                            "Data length greater than the max allowed: %d",
2522                            PN533_CMD_DATAEXCH_DATA_MAXLEN);
2523                return -ENOSYS;
2524        }
2525
2526        rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2527                                   pn533_tm_send_complete, NULL);
2528        if (rc < 0)
2529                dev_kfree_skb(skb);
2530
2531        return rc;
2532}
2533
2534static void pn533_wq_mi_recv(struct work_struct *work)
2535{
2536        struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2537
2538        struct sk_buff *skb;
2539        int rc;
2540
2541        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2542
2543        skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2544        if (!skb)
2545                goto error;
2546
2547        switch (dev->device_type) {
2548        case PN533_DEVICE_PASORI:
2549                if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2550                        rc = pn533_send_cmd_direct_async(dev,
2551                                                PN533_CMD_IN_COMM_THRU,
2552                                                skb,
2553                                                pn533_data_exchange_complete,
2554                                                 dev->cmd_complete_mi_arg);
2555
2556                        break;
2557                }
2558        default:
2559                *skb_put(skb, sizeof(u8)) =  1; /*TG*/
2560
2561                rc = pn533_send_cmd_direct_async(dev,
2562                                                 PN533_CMD_IN_DATA_EXCHANGE,
2563                                                 skb,
2564                                                 pn533_data_exchange_complete,
2565                                                 dev->cmd_complete_mi_arg);
2566
2567                break;
2568        }
2569
2570        if (rc == 0) /* success */
2571                return;
2572
2573        nfc_dev_err(&dev->interface->dev,
2574                    "Error %d when trying to perform data_exchange", rc);
2575
2576        dev_kfree_skb(skb);
2577        kfree(dev->cmd_complete_mi_arg);
2578
2579error:
2580        pn533_send_ack(dev, GFP_KERNEL);
2581        queue_work(dev->wq, &dev->cmd_work);
2582}
2583
2584static void pn533_wq_mi_send(struct work_struct *work)
2585{
2586        struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2587        struct sk_buff *skb;
2588        int rc;
2589
2590        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2591
2592        /* Grab the first skb in the queue */
2593        skb = skb_dequeue(&dev->fragment_skb);
2594
2595        if (skb == NULL) {      /* No more data */
2596                /* Reset the queue for future use */
2597                skb_queue_head_init(&dev->fragment_skb);
2598                goto error;
2599        }
2600
2601        switch (dev->device_type) {
2602        case PN533_DEVICE_PASORI:
2603                if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2604                        rc = -EIO;
2605                        break;
2606                }
2607
2608                rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2609                                                 skb,
2610                                                 pn533_data_exchange_complete,
2611                                                 dev->cmd_complete_dep_arg);
2612
2613                break;
2614
2615        default:
2616                /* Still some fragments? */
2617                rc = pn533_send_cmd_direct_async(dev,PN533_CMD_IN_DATA_EXCHANGE,
2618                                                 skb,
2619                                                 pn533_data_exchange_complete,
2620                                                 dev->cmd_complete_dep_arg);
2621
2622                break;
2623        }
2624
2625        if (rc == 0) /* success */
2626                return;
2627
2628        nfc_dev_err(&dev->interface->dev,
2629                    "Error %d when trying to perform data_exchange", rc);
2630
2631        dev_kfree_skb(skb);
2632        kfree(dev->cmd_complete_dep_arg);
2633
2634error:
2635        pn533_send_ack(dev, GFP_KERNEL);
2636        queue_work(dev->wq, &dev->cmd_work);
2637}
2638
2639static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2640                                                                u8 cfgdata_len)
2641{
2642        struct sk_buff *skb;
2643        struct sk_buff *resp;
2644
2645        int skb_len;
2646
2647        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2648
2649        skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2650
2651        skb = pn533_alloc_skb(dev, skb_len);
2652        if (!skb)
2653                return -ENOMEM;
2654
2655        *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2656        memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2657
2658        resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2659        if (IS_ERR(resp))
2660                return PTR_ERR(resp);
2661
2662        dev_kfree_skb(resp);
2663        return 0;
2664}
2665
2666static int pn533_get_firmware_version(struct pn533 *dev,
2667                                      struct pn533_fw_version *fv)
2668{
2669        struct sk_buff *skb;
2670        struct sk_buff *resp;
2671
2672        skb = pn533_alloc_skb(dev, 0);
2673        if (!skb)
2674                return -ENOMEM;
2675
2676        resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2677        if (IS_ERR(resp))
2678                return PTR_ERR(resp);
2679
2680        fv->ic = resp->data[0];
2681        fv->ver = resp->data[1];
2682        fv->rev = resp->data[2];
2683        fv->support = resp->data[3];
2684
2685        dev_kfree_skb(resp);
2686        return 0;
2687}
2688
2689static int pn533_pasori_fw_reset(struct pn533 *dev)
2690{
2691        struct sk_buff *skb;
2692        struct sk_buff *resp;
2693
2694        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2695
2696        skb = pn533_alloc_skb(dev, sizeof(u8));
2697        if (!skb)
2698                return -ENOMEM;
2699
2700        *skb_put(skb, sizeof(u8)) = 0x1;
2701
2702        resp = pn533_send_cmd_sync(dev, 0x18, skb);
2703        if (IS_ERR(resp))
2704                return PTR_ERR(resp);
2705
2706        dev_kfree_skb(resp);
2707
2708        return 0;
2709}
2710
2711struct pn533_acr122_poweron_rdr_arg {
2712        int rc;
2713        struct completion done;
2714};
2715
2716static void pn533_acr122_poweron_rdr_resp(struct urb *urb)
2717{
2718        struct pn533_acr122_poweron_rdr_arg *arg = urb->context;
2719
2720        nfc_dev_dbg(&urb->dev->dev, "%s", __func__);
2721
2722        print_hex_dump_debug("ACR122 RX: ", DUMP_PREFIX_NONE, 16, 1,
2723                       urb->transfer_buffer, urb->transfer_buffer_length,
2724                       false);
2725
2726        arg->rc = urb->status;
2727        complete(&arg->done);
2728}
2729
2730static int pn533_acr122_poweron_rdr(struct pn533 *dev)
2731{
2732        /* Power on th reader (CCID cmd) */
2733        u8 cmd[10] = {PN533_ACR122_PC_TO_RDR_ICCPOWERON,
2734                      0, 0, 0, 0, 0, 0, 3, 0, 0};
2735        u8 buf[255];
2736        int rc;
2737        void *cntx;
2738        struct pn533_acr122_poweron_rdr_arg arg;
2739
2740        nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
2741
2742        init_completion(&arg.done);
2743        cntx = dev->in_urb->context;  /* backup context */
2744
2745        dev->in_urb->transfer_buffer = buf;
2746        dev->in_urb->transfer_buffer_length = 255;
2747        dev->in_urb->complete = pn533_acr122_poweron_rdr_resp;
2748        dev->in_urb->context = &arg;
2749
2750        dev->out_urb->transfer_buffer = cmd;
2751        dev->out_urb->transfer_buffer_length = sizeof(cmd);
2752
2753        print_hex_dump_debug("ACR122 TX: ", DUMP_PREFIX_NONE, 16, 1,
2754                       cmd, sizeof(cmd), false);
2755
2756        rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
2757        if (rc) {
2758                nfc_dev_err(&dev->interface->dev,
2759                            "Reader power on cmd error %d", rc);
2760                return rc;
2761        }
2762
2763        rc =  usb_submit_urb(dev->in_urb, GFP_KERNEL);
2764        if (rc) {
2765                nfc_dev_err(&dev->interface->dev,
2766                            "Can't submit for reader power on cmd response %d",
2767                            rc);
2768                return rc;
2769        }
2770
2771        wait_for_completion(&arg.done);
2772        dev->in_urb->context = cntx; /* restore context */
2773
2774        return arg.rc;
2775}
2776
2777static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2778{
2779        struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2780        u8 rf_field = !!rf;
2781        int rc;
2782
2783        rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2784
2785        rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2786                                     (u8 *)&rf_field, 1);
2787        if (rc) {
2788                nfc_dev_err(&dev->interface->dev,
2789                            "Error on setting RF field");
2790                return rc;
2791        }
2792
2793        return rc;
2794}
2795
2796int pn533_dev_up(struct nfc_dev *nfc_dev)
2797{
2798        return pn533_rf_field(nfc_dev, 1);
2799}
2800
2801int pn533_dev_down(struct nfc_dev *nfc_dev)
2802{
2803        return pn533_rf_field(nfc_dev, 0);
2804}
2805
2806static struct nfc_ops pn533_nfc_ops = {
2807        .dev_up = pn533_dev_up,
2808        .dev_down = pn533_dev_down,
2809        .dep_link_up = pn533_dep_link_up,
2810        .dep_link_down = pn533_dep_link_down,
2811        .start_poll = pn533_start_poll,
2812        .stop_poll = pn533_stop_poll,
2813        .activate_target = pn533_activate_target,
2814        .deactivate_target = pn533_deactivate_target,
2815        .im_transceive = pn533_transceive,
2816        .tm_send = pn533_tm_send,
2817};
2818
2819static int pn533_setup(struct pn533 *dev)
2820{
2821        struct pn533_config_max_retries max_retries;
2822        struct pn533_config_timing timing;
2823        u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2824        int rc;
2825
2826        switch (dev->device_type) {
2827        case PN533_DEVICE_STD:
2828        case PN533_DEVICE_PASORI:
2829        case PN533_DEVICE_ACR122U:
2830                max_retries.mx_rty_atr = 0x2;
2831                max_retries.mx_rty_psl = 0x1;
2832                max_retries.mx_rty_passive_act =
2833                        PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2834
2835                timing.rfu = PN533_CONFIG_TIMING_102;
2836                timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2837                timing.dep_timeout = PN533_CONFIG_TIMING_204;
2838
2839                break;
2840
2841        default:
2842                nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2843                            dev->device_type);
2844                return -EINVAL;
2845        }
2846
2847        rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2848                                     (u8 *)&max_retries, sizeof(max_retries));
2849        if (rc) {
2850                nfc_dev_err(&dev->interface->dev,
2851                            "Error on setting MAX_RETRIES config");
2852                return rc;
2853        }
2854
2855
2856        rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2857                                     (u8 *)&timing, sizeof(timing));
2858        if (rc) {
2859                nfc_dev_err(&dev->interface->dev,
2860                            "Error on setting RF timings");
2861                return rc;
2862        }
2863
2864        switch (dev->device_type) {
2865        case PN533_DEVICE_STD:
2866                break;
2867
2868        case PN533_DEVICE_PASORI:
2869                pn533_pasori_fw_reset(dev);
2870
2871                rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2872                                             pasori_cfg, 3);
2873                if (rc) {
2874                        nfc_dev_err(&dev->interface->dev,
2875                                    "Error while settings PASORI config");
2876                        return rc;
2877                }
2878
2879                pn533_pasori_fw_reset(dev);
2880
2881                break;
2882        }
2883
2884        return 0;
2885}
2886
2887static int pn533_probe(struct usb_interface *interface,
2888                        const struct usb_device_id *id)
2889{
2890        struct pn533_fw_version fw_ver;
2891        struct pn533 *dev;
2892        struct usb_host_interface *iface_desc;
2893        struct usb_endpoint_descriptor *endpoint;
2894        int in_endpoint = 0;
2895        int out_endpoint = 0;
2896        int rc = -ENOMEM;
2897        int i;
2898        u32 protocols;
2899
2900        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2901        if (!dev)
2902                return -ENOMEM;
2903
2904        dev->udev = usb_get_dev(interface_to_usbdev(interface));
2905        dev->interface = interface;
2906        mutex_init(&dev->cmd_lock);
2907
2908        iface_desc = interface->cur_altsetting;
2909        for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
2910                endpoint = &iface_desc->endpoint[i].desc;
2911
2912                if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
2913                        in_endpoint = endpoint->bEndpointAddress;
2914
2915                if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
2916                        out_endpoint = endpoint->bEndpointAddress;
2917        }
2918
2919        if (!in_endpoint || !out_endpoint) {
2920                nfc_dev_err(&interface->dev,
2921                            "Could not find bulk-in or bulk-out endpoint");
2922                rc = -ENODEV;
2923                goto error;
2924        }
2925
2926        dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
2927        dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
2928
2929        if (!dev->in_urb || !dev->out_urb)
2930                goto error;
2931
2932        usb_fill_bulk_urb(dev->in_urb, dev->udev,
2933                          usb_rcvbulkpipe(dev->udev, in_endpoint),
2934                          NULL, 0, NULL, dev);
2935        usb_fill_bulk_urb(dev->out_urb, dev->udev,
2936                          usb_sndbulkpipe(dev->udev, out_endpoint),
2937                          NULL, 0, pn533_send_complete, dev);
2938
2939        INIT_WORK(&dev->cmd_work, pn533_wq_cmd);
2940        INIT_WORK(&dev->cmd_complete_work, pn533_wq_cmd_complete);
2941        INIT_WORK(&dev->mi_rx_work, pn533_wq_mi_recv);
2942        INIT_WORK(&dev->mi_tx_work, pn533_wq_mi_send);
2943        INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
2944        INIT_DELAYED_WORK(&dev->poll_work, pn533_wq_poll);
2945        INIT_WORK(&dev->rf_work, pn533_wq_rf);
2946        dev->wq = alloc_ordered_workqueue("pn533", 0);
2947        if (dev->wq == NULL)
2948                goto error;
2949
2950        init_timer(&dev->listen_timer);
2951        dev->listen_timer.data = (unsigned long) dev;
2952        dev->listen_timer.function = pn533_listen_mode_timer;
2953
2954        skb_queue_head_init(&dev->resp_q);
2955        skb_queue_head_init(&dev->fragment_skb);
2956
2957        INIT_LIST_HEAD(&dev->cmd_queue);
2958
2959        usb_set_intfdata(interface, dev);
2960
2961        dev->ops = &pn533_std_frame_ops;
2962
2963        dev->protocol_type = PN533_PROTO_REQ_ACK_RESP;
2964        dev->device_type = id->driver_info;
2965        switch (dev->device_type) {
2966        case PN533_DEVICE_STD:
2967                protocols = PN533_ALL_PROTOCOLS;
2968                break;
2969
2970        case PN533_DEVICE_PASORI:
2971                protocols = PN533_NO_TYPE_B_PROTOCOLS;
2972                break;
2973
2974        case PN533_DEVICE_ACR122U:
2975                protocols = PN533_NO_TYPE_B_PROTOCOLS;
2976                dev->ops = &pn533_acr122_frame_ops;
2977                dev->protocol_type = PN533_PROTO_REQ_RESP,
2978
2979                rc = pn533_acr122_poweron_rdr(dev);
2980                if (rc < 0) {
2981                        nfc_dev_err(&dev->interface->dev,
2982                                    "Couldn't poweron the reader (error %d)",
2983                                    rc);
2984                        goto destroy_wq;
2985                }
2986                break;
2987
2988        default:
2989                nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2990                            dev->device_type);
2991                rc = -EINVAL;
2992                goto destroy_wq;
2993        }
2994
2995        memset(&fw_ver, 0, sizeof(fw_ver));
2996        rc = pn533_get_firmware_version(dev, &fw_ver);
2997        if (rc < 0)
2998                goto destroy_wq;
2999
3000        nfc_dev_info(&dev->interface->dev,
3001                     "NXP PN5%02X firmware ver %d.%d now attached",
3002                     fw_ver.ic, fw_ver.ver, fw_ver.rev);
3003
3004
3005        dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
3006                                           dev->ops->tx_header_len +
3007                                           PN533_CMD_DATAEXCH_HEAD_LEN,
3008                                           dev->ops->tx_tail_len);
3009        if (!dev->nfc_dev) {
3010                rc = -ENOMEM;
3011                goto destroy_wq;
3012        }
3013
3014        nfc_set_parent_dev(dev->nfc_dev, &interface->dev);
3015        nfc_set_drvdata(dev->nfc_dev, dev);
3016
3017        rc = nfc_register_device(dev->nfc_dev);
3018        if (rc)
3019                goto free_nfc_dev;
3020
3021        rc = pn533_setup(dev);
3022        if (rc)
3023                goto unregister_nfc_dev;
3024
3025        return 0;
3026
3027unregister_nfc_dev:
3028        nfc_unregister_device(dev->nfc_dev);
3029
3030free_nfc_dev:
3031        nfc_free_device(dev->nfc_dev);
3032
3033destroy_wq:
3034        destroy_workqueue(dev->wq);
3035error:
3036        usb_free_urb(dev->in_urb);
3037        usb_free_urb(dev->out_urb);
3038        usb_put_dev(dev->udev);
3039        kfree(dev);
3040        return rc;
3041}
3042
3043static void pn533_disconnect(struct usb_interface *interface)
3044{
3045        struct pn533 *dev;
3046        struct pn533_cmd *cmd, *n;
3047
3048        dev = usb_get_intfdata(interface);
3049        usb_set_intfdata(interface, NULL);
3050
3051        nfc_unregister_device(dev->nfc_dev);
3052        nfc_free_device(dev->nfc_dev);
3053
3054        usb_kill_urb(dev->in_urb);
3055        usb_kill_urb(dev->out_urb);
3056
3057        flush_delayed_work(&dev->poll_work);
3058        destroy_workqueue(dev->wq);
3059
3060        skb_queue_purge(&dev->resp_q);
3061
3062        del_timer(&dev->listen_timer);
3063
3064        list_for_each_entry_safe(cmd, n, &dev->cmd_queue, queue) {
3065                list_del(&cmd->queue);
3066                kfree(cmd);
3067        }
3068
3069        usb_free_urb(dev->in_urb);
3070        usb_free_urb(dev->out_urb);
3071        kfree(dev);
3072
3073        nfc_dev_info(&interface->dev, "NXP PN533 NFC device disconnected");
3074}
3075
3076static struct usb_driver pn533_driver = {
3077        .name =         "pn533",
3078        .probe =        pn533_probe,
3079        .disconnect =   pn533_disconnect,
3080        .id_table =     pn533_table,
3081};
3082
3083module_usb_driver(pn533_driver);
3084
3085MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
3086MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
3087MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
3088MODULE_DESCRIPTION("PN533 usb driver ver " VERSION);
3089MODULE_VERSION(VERSION);
3090MODULE_LICENSE("GPL");
3091
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