drivers/nfc/pn533.c

   1 /*
   2  * Copyright (C) 2011 Instituto Nokia de Tecnologia
   3  * Copyright (C) 2012-2013 Tieto Poland
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the
  17  * Free Software Foundation, Inc.,
  18  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <linux/device.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/usb.h>
  26 #include <linux/nfc.h>
  27 #include <linux/netdevice.h>
  28 #include <net/nfc/nfc.h>
  29
  30 #define VERSION "0.2"
  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
  59 static 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 };
  82 MODULE_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
 162 struct pn533;
 163
 164 typedef 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 */
 170 struct 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
 195 struct pn533_config_max_retries {
 196         u8 mx_rty_atr;
 197         u8 mx_rty_psl;
 198         u8 mx_rty_passive_act;
 199 } __packed;
 200
 201 struct 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
 223 union 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 */
 237 enum {
 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
 249 struct 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
 258 static 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
 318 struct 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
 330 struct 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
 352 enum  pn533_protocol_type {
 353         PN533_PROTO_REQ_ACK_RESP = 0,
 354         PN533_PROTO_REQ_RESP
 355 };
 356
 357 struct 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
 405 struct 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
 416 struct pn533_std_frame {
 417         u8 preamble;
 418         __be16 start_frame;
 419         u8 datalen;
 420         u8 datalen_checksum;
 421         u8 data[];
 422 } __packed;
 423
 424 struct 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
 433 struct 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
 449 struct 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
 459 struct pn533_acr122_apdu_hdr {
 460         u8 class;
 461         u8 ins;
 462         u8 p1;
 463         u8 p2;
 464 } __packed;
 465
 466 struct 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
 473 struct pn533_acr122_rx_frame {
 474         struct pn533_acr122_ccid_hdr ccid;
 475         u8 data[]; /* pn533 frame : TFI ... */
 476 } __packed;
 477
 478 static 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
 501 static 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
 508 static 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
 515 static 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
 528 static 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
 536 static 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
 543 static 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 */
 560 static 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 */
 566 static inline u8 pn533_std_checksum(u8 value)
 567 {
 568         return ~value + 1;
 569 }
 570
 571 /* The rule: sum(data elements) + checksum = 0 */
 572 static 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
 583 static 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
 594 static 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
 606 static 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
 613 static 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
 652 static 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
 663 static 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
 679 static 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
 690 static 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
 706 static 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
 712 static 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                 dev_dbg(&dev->interface->dev,
 726                         "The urb has been canceled (status %d)\n",
 727                         urb->status);
 728                 goto sched_wq;
 729         case -ESHUTDOWN:
 730         default:
 731                 nfc_err(&dev->interface->dev,
 732                         "Urb failure (status %d)\n", urb->status);
 733                 goto sched_wq;
 734         }
 735
 736         in_frame = dev->in_urb->transfer_buffer;
 737
 738         dev_dbg(&dev->interface->dev, "Received a frame\n");
 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_err(&dev->interface->dev, "Received an invalid frame\n");
 744                 cmd->status = -EIO;
 745                 goto sched_wq;
 746         }
 747
 748         if (!pn533_rx_frame_is_cmd_response(dev, in_frame)) {
 749                 nfc_err(&dev->interface->dev,
 750                         "It it not the response to the last command\n");
 751                 cmd->status = -EIO;
 752                 goto sched_wq;
 753         }
 754
 755 sched_wq:
 756         queue_work(dev->wq, &dev->cmd_complete_work);
 757 }
 758
 759 static 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
 766 static 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                 dev_dbg(&dev->interface->dev,
 781                         "The urb has been stopped (status %d)\n",
 782                         urb->status);
 783                 goto sched_wq;
 784         case -ESHUTDOWN:
 785         default:
 786                 nfc_err(&dev->interface->dev,
 787                         "Urb failure (status %d)\n", 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_err(&dev->interface->dev, "Received an invalid ack\n");
 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_err(&dev->interface->dev,
 802                         "usb_submit_urb failed with result %d\n", rc);
 803                 cmd->status = rc;
 804                 goto sched_wq;
 805         }
 806
 807         return;
 808
 809 sched_wq:
 810         queue_work(dev->wq, &dev->cmd_complete_work);
 811 }
 812
 813 static 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
 820 static 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         dev->out_urb->transfer_buffer = ack;
 827         dev->out_urb->transfer_buffer_length = sizeof(ack);
 828         rc = usb_submit_urb(dev->out_urb, flags);
 829
 830         return rc;
 831 }
 832
 833 static int __pn533_send_frame_async(struct pn533 *dev,
 834                                         struct sk_buff *out,
 835                                         struct sk_buff *in,
 836                                         int in_len)
 837 {
 838         int rc;
 839
 840         dev->out_urb->transfer_buffer = out->data;
 841         dev->out_urb->transfer_buffer_length = out->len;
 842
 843         dev->in_urb->transfer_buffer = in->data;
 844         dev->in_urb->transfer_buffer_length = in_len;
 845
 846         print_hex_dump_debug("PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
 847                              out->data, out->len, false);
 848
 849         rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
 850         if (rc)
 851                 return rc;
 852
 853         if (dev->protocol_type == PN533_PROTO_REQ_RESP) {
 854                 /* request for response for sent packet directly */
 855                 rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
 856                 if (rc)
 857                         goto error;
 858         } else if (dev->protocol_type == PN533_PROTO_REQ_ACK_RESP) {
 859                 /* request for ACK if that's the case */
 860                 rc = pn533_submit_urb_for_ack(dev, GFP_KERNEL);
 861                 if (rc)
 862                         goto error;
 863         }
 864
 865         return 0;
 866
 867 error:
 868         usb_unlink_urb(dev->out_urb);
 869         return rc;
 870 }
 871
 872 static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
 873                                   struct sk_buff *skb)
 874 {
 875         /* payload is already there, just update datalen */
 876         int payload_len = skb->len;
 877         struct pn533_frame_ops *ops = dev->ops;
 878
 879
 880         skb_push(skb, ops->tx_header_len);
 881         skb_put(skb, ops->tx_tail_len);
 882
 883         ops->tx_frame_init(skb->data, cmd_code);
 884         ops->tx_update_payload_len(skb->data, payload_len);
 885         ops->tx_frame_finish(skb->data);
 886 }
 887
 888 static int pn533_send_async_complete(struct pn533 *dev)
 889 {
 890         struct pn533_cmd *cmd = dev->cmd;
 891         int status = cmd->status;
 892
 893         struct sk_buff *req = cmd->req;
 894         struct sk_buff *resp = cmd->resp;
 895
 896         int rc;
 897
 898         dev_kfree_skb(req);
 899
 900         if (status < 0) {
 901                 rc = cmd->complete_cb(dev, cmd->complete_cb_context,
 902                                       ERR_PTR(status));
 903                 dev_kfree_skb(resp);
 904                 goto done;
 905         }
 906
 907         skb_put(resp, dev->ops->rx_frame_size(resp->data));
 908         skb_pull(resp, dev->ops->rx_header_len);
 909         skb_trim(resp, resp->len - dev->ops->rx_tail_len);
 910
 911         rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp);
 912
 913 done:
 914         kfree(cmd);
 915         dev->cmd = NULL;
 916         return rc;
 917 }
 918
 919 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
 920                               struct sk_buff *req, struct sk_buff *resp,
 921                               int resp_len,
 922                               pn533_send_async_complete_t complete_cb,
 923                               void *complete_cb_context)
 924 {
 925         struct pn533_cmd *cmd;
 926         int rc = 0;
 927
 928         dev_dbg(&dev->interface->dev, "Sending command 0x%x\n", cmd_code);
 929
 930         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 931         if (!cmd)
 932                 return -ENOMEM;
 933
 934         cmd->code = cmd_code;
 935         cmd->req = req;
 936         cmd->resp = resp;
 937         cmd->resp_len = resp_len;
 938         cmd->complete_cb = complete_cb;
 939         cmd->complete_cb_context = complete_cb_context;
 940
 941         pn533_build_cmd_frame(dev, cmd_code, req);
 942
 943         mutex_lock(&dev->cmd_lock);
 944
 945         if (!dev->cmd_pending) {
 946                 rc = __pn533_send_frame_async(dev, req, resp, resp_len);
 947                 if (rc)
 948                         goto error;
 949
 950                 dev->cmd_pending = 1;
 951                 dev->cmd = cmd;
 952                 goto unlock;
 953         }
 954
 955         dev_dbg(&dev->interface->dev, "%s Queueing command 0x%x\n",
 956                 __func__, cmd_code);
 957
 958         INIT_LIST_HEAD(&cmd->queue);
 959         list_add_tail(&cmd->queue, &dev->cmd_queue);
 960
 961         goto unlock;
 962
 963 error:
 964         kfree(cmd);
 965 unlock:
 966         mutex_unlock(&dev->cmd_lock);
 967         return rc;
 968 }
 969
 970 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
 971                                  struct sk_buff *req,
 972                                  pn533_send_async_complete_t complete_cb,
 973                                  void *complete_cb_context)
 974 {
 975         struct sk_buff *resp;
 976         int rc;
 977         int  resp_len = dev->ops->rx_header_len +
 978                         dev->ops->max_payload_len +
 979                         dev->ops->rx_tail_len;
 980
 981         resp = nfc_alloc_recv_skb(resp_len, GFP_KERNEL);
 982         if (!resp)
 983                 return -ENOMEM;
 984
 985         rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
 986                                 complete_cb_context);
 987         if (rc)
 988                 dev_kfree_skb(resp);
 989
 990         return rc;
 991 }
 992
 993 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
 994                                 struct sk_buff *req,
 995                                 pn533_send_async_complete_t complete_cb,
 996                                 void *complete_cb_context)
 997 {
 998         struct sk_buff *resp;
 999         int rc;
1000         int  resp_len = dev->ops->rx_header_len +
1001                         dev->ops->max_payload_len +
1002                         dev->ops->rx_tail_len;
1003
1004         resp = alloc_skb(resp_len, GFP_KERNEL);
1005         if (!resp)
1006                 return -ENOMEM;
1007
1008         rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
1009                                 complete_cb_context);
1010         if (rc)
1011                 dev_kfree_skb(resp);
1012
1013         return rc;
1014 }
1015
1016 /*
1017  * pn533_send_cmd_direct_async
1018  *
1019  * The function sends a piority cmd directly to the chip omiting the cmd
1020  * queue. It's intended to be used by chaining mechanism of received responses
1021  * where the host has to request every single chunk of data before scheduling
1022  * next cmd from the queue.
1023  */
1024 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
1025                                        struct sk_buff *req,
1026                                        pn533_send_async_complete_t complete_cb,
1027                                        void *complete_cb_context)
1028 {
1029         struct sk_buff *resp;
1030         struct pn533_cmd *cmd;
1031         int rc;
1032         int resp_len = dev->ops->rx_header_len +
1033                        dev->ops->max_payload_len +
1034                        dev->ops->rx_tail_len;
1035
1036         resp = alloc_skb(resp_len, GFP_KERNEL);
1037         if (!resp)
1038                 return -ENOMEM;
1039
1040         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
1041         if (!cmd) {
1042                 dev_kfree_skb(resp);
1043                 return -ENOMEM;
1044         }
1045
1046         cmd->code = cmd_code;
1047         cmd->req = req;
1048         cmd->resp = resp;
1049         cmd->resp_len = resp_len;
1050         cmd->complete_cb = complete_cb;
1051         cmd->complete_cb_context = complete_cb_context;
1052
1053         pn533_build_cmd_frame(dev, cmd_code, req);
1054
1055         rc = __pn533_send_frame_async(dev, req, resp, resp_len);
1056         if (rc < 0) {
1057                 dev_kfree_skb(resp);
1058                 kfree(cmd);
1059         } else {
1060                 dev->cmd = cmd;
1061         }
1062
1063         return rc;
1064 }
1065
1066 static void pn533_wq_cmd_complete(struct work_struct *work)
1067 {
1068         struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
1069         int rc;
1070
1071         rc = pn533_send_async_complete(dev);
1072         if (rc != -EINPROGRESS)
1073                 queue_work(dev->wq, &dev->cmd_work);
1074 }
1075
1076 static void pn533_wq_cmd(struct work_struct *work)
1077 {
1078         struct pn533 *dev = container_of(work, struct pn533, cmd_work);
1079         struct pn533_cmd *cmd;
1080         int rc;
1081
1082         mutex_lock(&dev->cmd_lock);
1083
1084         if (list_empty(&dev->cmd_queue)) {
1085                 dev->cmd_pending = 0;
1086                 mutex_unlock(&dev->cmd_lock);
1087                 return;
1088         }
1089
1090         cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
1091
1092         list_del(&cmd->queue);
1093
1094         mutex_unlock(&dev->cmd_lock);
1095
1096         rc = __pn533_send_frame_async(dev, cmd->req, cmd->resp, cmd->resp_len);
1097         if (rc < 0) {
1098                 dev_kfree_skb(cmd->req);
1099                 dev_kfree_skb(cmd->resp);
1100                 kfree(cmd);
1101                 return;
1102         }
1103
1104         dev->cmd = cmd;
1105 }
1106
1107 struct pn533_sync_cmd_response {
1108         struct sk_buff *resp;
1109         struct completion done;
1110 };
1111
1112 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
1113                                     struct sk_buff *resp)
1114 {
1115         struct pn533_sync_cmd_response *arg = _arg;
1116
1117         arg->resp = resp;
1118         complete(&arg->done);
1119
1120         return 0;
1121 }
1122
1123 /*  pn533_send_cmd_sync
1124  *
1125  *  Please note the req parameter is freed inside the function to
1126  *  limit a number of return value interpretations by the caller.
1127  *
1128  *  1. negative in case of error during TX path -> req should be freed
1129  *
1130  *  2. negative in case of error during RX path -> req should not be freed
1131  *     as it's been already freed at the begining of RX path by
1132  *     async_complete_cb.
1133  *
1134  *  3. valid pointer in case of succesfult RX path
1135  *
1136  *  A caller has to check a return value with IS_ERR macro. If the test pass,
1137  *  the returned pointer is valid.
1138  *
1139  * */
1140 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
1141                                                struct sk_buff *req)
1142 {
1143         int rc;
1144         struct pn533_sync_cmd_response arg;
1145
1146         init_completion(&arg.done);
1147
1148         rc = pn533_send_cmd_async(dev, cmd_code, req,
1149                                   pn533_send_sync_complete, &arg);
1150         if (rc) {
1151                 dev_kfree_skb(req);
1152                 return ERR_PTR(rc);
1153         }
1154
1155         wait_for_completion(&arg.done);
1156
1157         return arg.resp;
1158 }
1159
1160 static void pn533_send_complete(struct urb *urb)
1161 {
1162         struct pn533 *dev = urb->context;
1163
1164         switch (urb->status) {
1165         case 0:
1166                 break; /* success */
1167         case -ECONNRESET:
1168         case -ENOENT:
1169                 dev_dbg(&dev->interface->dev,
1170                         "The urb has been stopped (status %d)\n",
1171                         urb->status);
1172                 break;
1173         case -ESHUTDOWN:
1174         default:
1175                 nfc_err(&dev->interface->dev, "Urb failure (status %d)\n",
1176                         urb->status);
1177         }
1178 }
1179
1180 static void pn533_abort_cmd(struct pn533 *dev, gfp_t flags)
1181 {
1182         /* ACR122U does not support any command which aborts last
1183          * issued command i.e. as ACK for standard PN533. Additionally,
1184          * it behaves stange, sending broken or incorrect responses,
1185          * when we cancel urb before the chip will send response.
1186          */
1187         if (dev->device_type == PN533_DEVICE_ACR122U)
1188                 return;
1189
1190         /* An ack will cancel the last issued command */
1191         pn533_send_ack(dev, flags);
1192
1193         /* cancel the urb request */
1194         usb_kill_urb(dev->in_urb);
1195 }
1196
1197 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
1198 {
1199         struct sk_buff *skb;
1200
1201         skb = alloc_skb(dev->ops->tx_header_len +
1202                         size +
1203                         dev->ops->tx_tail_len, GFP_KERNEL);
1204
1205         if (skb)
1206                 skb_reserve(skb, dev->ops->tx_header_len);
1207
1208         return skb;
1209 }
1210
1211 struct pn533_target_type_a {
1212         __be16 sens_res;
1213         u8 sel_res;
1214         u8 nfcid_len;
1215         u8 nfcid_data[];
1216 } __packed;
1217
1218
1219 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
1220 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
1221 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
1222
1223 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
1224 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
1225
1226 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
1227 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
1228
1229 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
1230 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
1231 #define PN533_TYPE_A_SEL_PROT_DEP 2
1232 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
1233
1234 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
1235                                                         int target_data_len)
1236 {
1237         u8 ssd;
1238         u8 platconf;
1239
1240         if (target_data_len < sizeof(struct pn533_target_type_a))
1241                 return false;
1242
1243         /* The lenght check of nfcid[] and ats[] are not being performed because
1244            the values are not being used */
1245
1246         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1247         ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
1248         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
1249
1250         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1251              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1252             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1253              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1254                 return false;
1255
1256         /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
1257         if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
1258                 return false;
1259
1260         return true;
1261 }
1262
1263 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
1264                                                         int tgt_data_len)
1265 {
1266         struct pn533_target_type_a *tgt_type_a;
1267
1268         tgt_type_a = (struct pn533_target_type_a *)tgt_data;
1269
1270         if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
1271                 return -EPROTO;
1272
1273         switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
1274         case PN533_TYPE_A_SEL_PROT_MIFARE:
1275                 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
1276                 break;
1277         case PN533_TYPE_A_SEL_PROT_ISO14443:
1278                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
1279                 break;
1280         case PN533_TYPE_A_SEL_PROT_DEP:
1281                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1282                 break;
1283         case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
1284                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
1285                                                         NFC_PROTO_NFC_DEP_MASK;
1286                 break;
1287         }
1288
1289         nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
1290         nfc_tgt->sel_res = tgt_type_a->sel_res;
1291         nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
1292         memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
1293
1294         return 0;
1295 }
1296
1297 struct pn533_target_felica {
1298         u8 pol_res;
1299         u8 opcode;
1300         u8 nfcid2[NFC_NFCID2_MAXSIZE];
1301         u8 pad[8];
1302         /* optional */
1303         u8 syst_code[];
1304 } __packed;
1305
1306 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
1307 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
1308
1309 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
1310                                                         int target_data_len)
1311 {
1312         if (target_data_len < sizeof(struct pn533_target_felica))
1313                 return false;
1314
1315         if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
1316                 return false;
1317
1318         return true;
1319 }
1320
1321 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
1322                                                         int tgt_data_len)
1323 {
1324         struct pn533_target_felica *tgt_felica;
1325
1326         tgt_felica = (struct pn533_target_felica *)tgt_data;
1327
1328         if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
1329                 return -EPROTO;
1330
1331         if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
1332             (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
1333                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1334         else
1335                 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
1336
1337         memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
1338         nfc_tgt->sensf_res_len = 9;
1339
1340         memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
1341         nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
1342
1343         return 0;
1344 }
1345
1346 struct pn533_target_jewel {
1347         __be16 sens_res;
1348         u8 jewelid[4];
1349 } __packed;
1350
1351 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
1352                                                         int target_data_len)
1353 {
1354         u8 ssd;
1355         u8 platconf;
1356
1357         if (target_data_len < sizeof(struct pn533_target_jewel))
1358                 return false;
1359
1360         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
1361         ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
1362         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
1363
1364         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1365              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
1366             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
1367              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
1368                 return false;
1369
1370         return true;
1371 }
1372
1373 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
1374                                                         int tgt_data_len)
1375 {
1376         struct pn533_target_jewel *tgt_jewel;
1377
1378         tgt_jewel = (struct pn533_target_jewel *)tgt_data;
1379
1380         if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
1381                 return -EPROTO;
1382
1383         nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
1384         nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
1385         nfc_tgt->nfcid1_len = 4;
1386         memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
1387
1388         return 0;
1389 }
1390
1391 struct pn533_type_b_prot_info {
1392         u8 bitrate;
1393         u8 fsci_type;
1394         u8 fwi_adc_fo;
1395 } __packed;
1396
1397 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
1398 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
1399 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
1400
1401 struct pn533_type_b_sens_res {
1402         u8 opcode;
1403         u8 nfcid[4];
1404         u8 appdata[4];
1405         struct pn533_type_b_prot_info prot_info;
1406 } __packed;
1407
1408 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
1409
1410 struct pn533_target_type_b {
1411         struct pn533_type_b_sens_res sensb_res;
1412         u8 attrib_res_len;
1413         u8 attrib_res[];
1414 } __packed;
1415
1416 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
1417                                                         int target_data_len)
1418 {
1419         if (target_data_len < sizeof(struct pn533_target_type_b))
1420                 return false;
1421
1422         if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
1423                 return false;
1424
1425         if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
1426                                                 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
1427                 return false;
1428
1429         return true;
1430 }
1431
1432 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
1433                                                         int tgt_data_len)
1434 {
1435         struct pn533_target_type_b *tgt_type_b;
1436
1437         tgt_type_b = (struct pn533_target_type_b *)tgt_data;
1438
1439         if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
1440                 return -EPROTO;
1441
1442         nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
1443
1444         return 0;
1445 }
1446
1447 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
1448                               int tgdata_len)
1449 {
1450         struct nfc_target nfc_tgt;
1451         int rc;
1452
1453         dev_dbg(&dev->interface->dev, "%s: modulation=%d\n",
1454                 __func__, dev->poll_mod_curr);
1455
1456         if (tg != 1)
1457                 return -EPROTO;
1458
1459         memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1460
1461         switch (dev->poll_mod_curr) {
1462         case PN533_POLL_MOD_106KBPS_A:
1463                 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
1464                 break;
1465         case PN533_POLL_MOD_212KBPS_FELICA:
1466         case PN533_POLL_MOD_424KBPS_FELICA:
1467                 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
1468                 break;
1469         case PN533_POLL_MOD_106KBPS_JEWEL:
1470                 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
1471                 break;
1472         case PN533_POLL_MOD_847KBPS_B:
1473                 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
1474                 break;
1475         default:
1476                 nfc_err(&dev->interface->dev,
1477                         "Unknown current poll modulation\n");
1478                 return -EPROTO;
1479         }
1480
1481         if (rc)
1482                 return rc;
1483
1484         if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1485                 dev_dbg(&dev->interface->dev,
1486                         "The Tg found doesn't have the desired protocol\n");
1487                 return -EAGAIN;
1488         }
1489
1490         dev_dbg(&dev->interface->dev,
1491                 "Target found - supported protocols: 0x%x\n",
1492                 nfc_tgt.supported_protocols);
1493
1494         dev->tgt_available_prots = nfc_tgt.supported_protocols;
1495
1496         nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1497
1498         return 0;
1499 }
1500
1501 static inline void pn533_poll_next_mod(struct pn533 *dev)
1502 {
1503         dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
1504 }
1505
1506 static void pn533_poll_reset_mod_list(struct pn533 *dev)
1507 {
1508         dev->poll_mod_count = 0;
1509 }
1510
1511 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
1512 {
1513         dev->poll_mod_active[dev->poll_mod_count] =
1514                 (struct pn533_poll_modulations *)&poll_mod[mod_index];
1515         dev->poll_mod_count++;
1516 }
1517
1518 static void pn533_poll_create_mod_list(struct pn533 *dev,
1519                                        u32 im_protocols, u32 tm_protocols)
1520 {
1521         pn533_poll_reset_mod_list(dev);
1522
1523         if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
1524             (im_protocols & NFC_PROTO_ISO14443_MASK) ||
1525             (im_protocols & NFC_PROTO_NFC_DEP_MASK))
1526                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
1527
1528         if (im_protocols & NFC_PROTO_FELICA_MASK ||
1529             im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1530                 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
1531                 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
1532         }
1533
1534         if (im_protocols & NFC_PROTO_JEWEL_MASK)
1535                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
1536
1537         if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1538                 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
1539
1540         if (tm_protocols)
1541                 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
1542 }
1543
1544 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
1545 {
1546         u8 nbtg, tg, *tgdata;
1547         int rc, tgdata_len;
1548
1549         nbtg = resp->data[0];
1550         tg = resp->data[1];
1551         tgdata = &resp->data[2];
1552         tgdata_len = resp->len - 2;  /* nbtg + tg */
1553
1554         if (nbtg) {
1555                 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1556
1557                 /* We must stop the poll after a valid target found */
1558                 if (rc == 0) {
1559                         pn533_poll_reset_mod_list(dev);
1560                         return 0;
1561                 }
1562         }
1563
1564         return -EAGAIN;
1565 }
1566
1567 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1568 {
1569         struct sk_buff *skb;
1570         u8 *felica, *nfcid3, *gb;
1571
1572         u8 *gbytes = dev->gb;
1573         size_t gbytes_len = dev->gb_len;
1574
1575         u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1576                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1577                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1578                                 0xff, 0xff}; /* System code */
1579
1580         u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1581                                0x0, 0x0, 0x0,
1582                                0x40}; /* SEL_RES for DEP */
1583
1584         unsigned int skb_len = 36 + /* mode (1), mifare (6),
1585                                        felica (18), nfcid3 (10), gb_len (1) */
1586                                gbytes_len +
1587                                1;  /* len Tk*/
1588
1589         skb = pn533_alloc_skb(dev, skb_len);
1590         if (!skb)
1591                 return NULL;
1592
1593         /* DEP support only */
1594         *skb_put(skb, 1) = PN533_INIT_TARGET_DEP;
1595
1596         /* MIFARE params */
1597         memcpy(skb_put(skb, 6), mifare_params, 6);
1598
1599         /* Felica params */
1600         felica = skb_put(skb, 18);
1601         memcpy(felica, felica_params, 18);
1602         get_random_bytes(felica + 2, 6);
1603
1604         /* NFCID3 */
1605         nfcid3 = skb_put(skb, 10);
1606         memset(nfcid3, 0, 10);
1607         memcpy(nfcid3, felica, 8);
1608
1609         /* General bytes */
1610         *skb_put(skb, 1) = gbytes_len;
1611
1612         gb = skb_put(skb, gbytes_len);
1613         memcpy(gb, gbytes, gbytes_len);
1614
1615         /* Len Tk */
1616         *skb_put(skb, 1) = 0;
1617
1618         return skb;
1619 }
1620
1621 #define PN533_CMD_DATAEXCH_HEAD_LEN 1
1622 #define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
1623 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1624                                       struct sk_buff *resp)
1625 {
1626         u8 status;
1627
1628         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1629
1630         if (IS_ERR(resp))
1631                 return PTR_ERR(resp);
1632
1633         status = resp->data[0];
1634         skb_pull(resp, sizeof(status));
1635
1636         if (status != 0) {
1637                 nfc_tm_deactivated(dev->nfc_dev);
1638                 dev->tgt_mode = 0;
1639                 dev_kfree_skb(resp);
1640                 return 0;
1641         }
1642
1643         return nfc_tm_data_received(dev->nfc_dev, resp);
1644 }
1645
1646 static void pn533_wq_tg_get_data(struct work_struct *work)
1647 {
1648         struct pn533 *dev = container_of(work, struct pn533, tg_work);
1649         struct sk_buff *skb;
1650         int rc;
1651
1652         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1653
1654         skb = pn533_alloc_skb(dev, 0);
1655         if (!skb)
1656                 return;
1657
1658         rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1659                                    pn533_tm_get_data_complete, NULL);
1660
1661         if (rc < 0)
1662                 dev_kfree_skb(skb);
1663
1664         return;
1665 }
1666
1667 #define ATR_REQ_GB_OFFSET 17
1668 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1669 {
1670         u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1671         size_t gb_len;
1672         int rc;
1673
1674         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1675
1676         if (resp->len < ATR_REQ_GB_OFFSET + 1)
1677                 return -EINVAL;
1678
1679         mode = resp->data[0];
1680         cmd = &resp->data[1];
1681
1682         dev_dbg(&dev->interface->dev, "Target mode 0x%x len %d\n",
1683                 mode, resp->len);
1684
1685         if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1686             PN533_INIT_TARGET_RESP_ACTIVE)
1687                 comm_mode = NFC_COMM_ACTIVE;
1688
1689         if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0)  /* Only DEP supported */
1690                 return -EOPNOTSUPP;
1691
1692         gb = cmd + ATR_REQ_GB_OFFSET;
1693         gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1694
1695         rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1696                               comm_mode, gb, gb_len);
1697         if (rc < 0) {
1698                 nfc_err(&dev->interface->dev,
1699                         "Error when signaling target activation\n");
1700                 return rc;
1701         }
1702
1703         dev->tgt_mode = 1;
1704         queue_work(dev->wq, &dev->tg_work);
1705
1706         return 0;
1707 }
1708
1709 static void pn533_listen_mode_timer(unsigned long data)
1710 {
1711         struct pn533 *dev = (struct pn533 *)data;
1712
1713         dev_dbg(&dev->interface->dev, "Listen mode timeout\n");
1714
1715         dev->cancel_listen = 1;
1716
1717         pn533_poll_next_mod(dev);
1718
1719         queue_delayed_work(dev->wq, &dev->poll_work,
1720                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1721 }
1722
1723 static int pn533_rf_complete(struct pn533 *dev, void *arg,
1724                              struct sk_buff *resp)
1725 {
1726         int rc = 0;
1727
1728         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1729
1730         if (IS_ERR(resp)) {
1731                 rc = PTR_ERR(resp);
1732
1733                 nfc_err(&dev->interface->dev, "RF setting error %d", rc);
1734
1735                 return rc;
1736         }
1737
1738         queue_delayed_work(dev->wq, &dev->poll_work,
1739                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1740
1741         dev_kfree_skb(resp);
1742         return rc;
1743 }
1744
1745 static void pn533_wq_rf(struct work_struct *work)
1746 {
1747         struct pn533 *dev = container_of(work, struct pn533, rf_work);
1748         struct sk_buff *skb;
1749         int rc;
1750
1751         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1752
1753         skb = pn533_alloc_skb(dev, 2);
1754         if (!skb)
1755                 return;
1756
1757         *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD;
1758         *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
1759
1760         rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1761                                   pn533_rf_complete, NULL);
1762         if (rc < 0) {
1763                 dev_kfree_skb(skb);
1764                 nfc_err(&dev->interface->dev, "RF setting error %d\n", rc);
1765         }
1766
1767         return;
1768 }
1769
1770 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1771                                struct sk_buff *resp)
1772 {
1773         struct pn533_poll_modulations *cur_mod;
1774         int rc;
1775
1776         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1777
1778         if (IS_ERR(resp)) {
1779                 rc = PTR_ERR(resp);
1780
1781                 nfc_err(&dev->interface->dev, "%s  Poll complete error %d\n",
1782                         __func__, rc);
1783
1784                 if (rc == -ENOENT) {
1785                         if (dev->poll_mod_count != 0)
1786                                 return rc;
1787                         else
1788                                 goto stop_poll;
1789                 } else if (rc < 0) {
1790                         nfc_err(&dev->interface->dev,
1791                                 "Error %d when running poll\n", rc);
1792                         goto stop_poll;
1793                 }
1794         }
1795
1796         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1797
1798         if (cur_mod->len == 0) { /* Target mode */
1799                 del_timer(&dev->listen_timer);
1800                 rc = pn533_init_target_complete(dev, resp);
1801                 goto done;
1802         }
1803
1804         /* Initiator mode */
1805         rc = pn533_start_poll_complete(dev, resp);
1806         if (!rc)
1807                 goto done;
1808
1809         if (!dev->poll_mod_count) {
1810                 dev_dbg(&dev->interface->dev, "Polling has been stopped\n");
1811                 goto done;
1812         }
1813
1814         pn533_poll_next_mod(dev);
1815         /* Not target found, turn radio off */
1816         queue_work(dev->wq, &dev->rf_work);
1817
1818 done:
1819         dev_kfree_skb(resp);
1820         return rc;
1821
1822 stop_poll:
1823         nfc_err(&dev->interface->dev, "Polling operation has been stopped\n");
1824
1825         pn533_poll_reset_mod_list(dev);
1826         dev->poll_protocols = 0;
1827         return rc;
1828 }
1829
1830 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1831                                         struct pn533_poll_modulations *mod)
1832 {
1833         struct sk_buff *skb;
1834
1835         skb = pn533_alloc_skb(dev, mod->len);
1836         if (!skb)
1837                 return NULL;
1838
1839         memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
1840
1841         return skb;
1842 }
1843
1844 static int pn533_send_poll_frame(struct pn533 *dev)
1845 {
1846         struct pn533_poll_modulations *mod;
1847         struct sk_buff *skb;
1848         int rc;
1849         u8 cmd_code;
1850
1851         mod = dev->poll_mod_active[dev->poll_mod_curr];
1852
1853         dev_dbg(&dev->interface->dev, "%s mod len %d\n",
1854                 __func__, mod->len);
1855
1856         if (mod->len == 0) {  /* Listen mode */
1857                 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1858                 skb = pn533_alloc_poll_tg_frame(dev);
1859         } else {  /* Polling mode */
1860                 cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
1861                 skb = pn533_alloc_poll_in_frame(dev, mod);
1862         }
1863
1864         if (!skb) {
1865                 nfc_err(&dev->interface->dev, "Failed to allocate skb\n");
1866                 return -ENOMEM;
1867         }
1868
1869         rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1870                                   NULL);
1871         if (rc < 0) {
1872                 dev_kfree_skb(skb);
1873                 nfc_err(&dev->interface->dev, "Polling loop error %d\n", rc);
1874         }
1875
1876         return rc;
1877 }
1878
1879 static void pn533_wq_poll(struct work_struct *work)
1880 {
1881         struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1882         struct pn533_poll_modulations *cur_mod;
1883         int rc;
1884
1885         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1886
1887         dev_dbg(&dev->interface->dev,
1888                 "%s cancel_listen %d modulation len %d\n",
1889                 __func__, dev->cancel_listen, cur_mod->len);
1890
1891         if (dev->cancel_listen == 1) {
1892                 dev->cancel_listen = 0;
1893                 pn533_abort_cmd(dev, GFP_ATOMIC);
1894         }
1895
1896         rc = pn533_send_poll_frame(dev);
1897         if (rc)
1898                 return;
1899
1900         if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1901                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1902
1903         return;
1904 }
1905
1906 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1907                             u32 im_protocols, u32 tm_protocols)
1908 {
1909         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1910         u8 rand_mod;
1911
1912         dev_dbg(&dev->interface->dev,
1913                 "%s: im protocols 0x%x tm protocols 0x%x\n",
1914                 __func__, im_protocols, tm_protocols);
1915
1916         if (dev->tgt_active_prot) {
1917                 nfc_err(&dev->interface->dev,
1918                         "Cannot poll with a target already activated\n");
1919                 return -EBUSY;
1920         }
1921
1922         if (dev->tgt_mode) {
1923                 nfc_err(&dev->interface->dev,
1924                         "Cannot poll while already being activated\n");
1925                 return -EBUSY;
1926         }
1927
1928         if (tm_protocols) {
1929                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1930                 if (dev->gb == NULL)
1931                         tm_protocols = 0;
1932         }
1933
1934         pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1935         dev->poll_protocols = im_protocols;
1936         dev->listen_protocols = tm_protocols;
1937
1938         /* Do not always start polling from the same modulation */
1939         get_random_bytes(&rand_mod, sizeof(rand_mod));
1940         rand_mod %= dev->poll_mod_count;
1941         dev->poll_mod_curr = rand_mod;
1942
1943         return pn533_send_poll_frame(dev);
1944 }
1945
1946 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1947 {
1948         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1949
1950         del_timer(&dev->listen_timer);
1951
1952         if (!dev->poll_mod_count) {
1953                 dev_dbg(&dev->interface->dev,
1954                         "Polling operation was not running\n");
1955                 return;
1956         }
1957
1958         pn533_abort_cmd(dev, GFP_KERNEL);
1959         flush_delayed_work(&dev->poll_work);
1960         pn533_poll_reset_mod_list(dev);
1961 }
1962
1963 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1964 {
1965         struct pn533_cmd_activate_response *rsp;
1966         u16 gt_len;
1967         int rc;
1968         struct sk_buff *skb;
1969         struct sk_buff *resp;
1970
1971         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1972
1973         skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1974         if (!skb)
1975                 return -ENOMEM;
1976
1977         *skb_put(skb, sizeof(u8)) = 1; /* TG */
1978         *skb_put(skb, sizeof(u8)) = 0; /* Next */
1979
1980         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1981         if (IS_ERR(resp))
1982                 return PTR_ERR(resp);
1983
1984         rsp = (struct pn533_cmd_activate_response *)resp->data;
1985         rc = rsp->status & PN533_CMD_RET_MASK;
1986         if (rc != PN533_CMD_RET_SUCCESS) {
1987                 nfc_err(&dev->interface->dev,
1988                         "Target activation failed (error 0x%x)\n", rc);
1989                 dev_kfree_skb(resp);
1990                 return -EIO;
1991         }
1992
1993         /* ATR_RES general bytes are located at offset 16 */
1994         gt_len = resp->len - 16;
1995         rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1996
1997         dev_kfree_skb(resp);
1998         return rc;
1999 }
2000
2001 static int pn533_activate_target(struct nfc_dev *nfc_dev,
2002                                  struct nfc_target *target, u32 protocol)
2003 {
2004         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2005         int rc;
2006
2007         dev_dbg(&dev->interface->dev, "%s: protocol=%u\n", __func__, protocol);
2008
2009         if (dev->poll_mod_count) {
2010                 nfc_err(&dev->interface->dev,
2011                         "Cannot activate while polling\n");
2012                 return -EBUSY;
2013         }
2014
2015         if (dev->tgt_active_prot) {
2016                 nfc_err(&dev->interface->dev,
2017                         "There is already an active target\n");
2018                 return -EBUSY;
2019         }
2020
2021         if (!dev->tgt_available_prots) {
2022                 nfc_err(&dev->interface->dev,
2023                         "There is no available target to activate\n");
2024                 return -EINVAL;
2025         }
2026
2027         if (!(dev->tgt_available_prots & (1 << protocol))) {
2028                 nfc_err(&dev->interface->dev,
2029                         "Target doesn't support requested proto %u\n",
2030                         protocol);
2031                 return -EINVAL;
2032         }
2033
2034         if (protocol == NFC_PROTO_NFC_DEP) {
2035                 rc = pn533_activate_target_nfcdep(dev);
2036                 if (rc) {
2037                         nfc_err(&dev->interface->dev,
2038                                 "Activating target with DEP failed %d\n", rc);
2039                         return rc;
2040                 }
2041         }
2042
2043         dev->tgt_active_prot = protocol;
2044         dev->tgt_available_prots = 0;
2045
2046         return 0;
2047 }
2048
2049 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
2050                                     struct nfc_target *target)
2051 {
2052         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2053         struct sk_buff *skb;
2054         struct sk_buff *resp;
2055         int rc;
2056
2057         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2058
2059         if (!dev->tgt_active_prot) {
2060                 nfc_err(&dev->interface->dev, "There is no active target\n");
2061                 return;
2062         }
2063
2064         dev->tgt_active_prot = 0;
2065         skb_queue_purge(&dev->resp_q);
2066
2067         skb = pn533_alloc_skb(dev, sizeof(u8));
2068         if (!skb)
2069                 return;
2070
2071         *skb_put(skb, 1) = 1; /* TG*/
2072
2073         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_RELEASE, skb);
2074         if (IS_ERR(resp))
2075                 return;
2076
2077         rc = resp->data[0] & PN533_CMD_RET_MASK;
2078         if (rc != PN533_CMD_RET_SUCCESS)
2079                 nfc_err(&dev->interface->dev,
2080                         "Error 0x%x when releasing the target\n", rc);
2081
2082         dev_kfree_skb(resp);
2083         return;
2084 }
2085
2086
2087 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
2088                                          struct sk_buff *resp)
2089 {
2090         struct pn533_cmd_jump_dep_response *rsp;
2091         u8 target_gt_len;
2092         int rc;
2093         u8 active = *(u8 *)arg;
2094
2095         kfree(arg);
2096
2097         if (IS_ERR(resp))
2098                 return PTR_ERR(resp);
2099
2100         if (dev->tgt_available_prots &&
2101             !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
2102                 nfc_err(&dev->interface->dev,
2103                         "The target does not support DEP\n");
2104                 rc =  -EINVAL;
2105                 goto error;
2106         }
2107
2108         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
2109
2110         rc = rsp->status & PN533_CMD_RET_MASK;
2111         if (rc != PN533_CMD_RET_SUCCESS) {
2112                 nfc_err(&dev->interface->dev,
2113                         "Bringing DEP link up failed (error 0x%x)\n", rc);
2114                 goto error;
2115         }
2116
2117         if (!dev->tgt_available_prots) {
2118                 struct nfc_target nfc_target;
2119
2120                 dev_dbg(&dev->interface->dev, "Creating new target\n");
2121
2122                 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
2123                 nfc_target.nfcid1_len = 10;
2124                 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
2125                 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
2126                 if (rc)
2127                         goto error;
2128
2129                 dev->tgt_available_prots = 0;
2130         }
2131
2132         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
2133
2134         /* ATR_RES general bytes are located at offset 17 */
2135         target_gt_len = resp->len - 17;
2136         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
2137                                           rsp->gt, target_gt_len);
2138         if (rc == 0)
2139                 rc = nfc_dep_link_is_up(dev->nfc_dev,
2140                                         dev->nfc_dev->targets[0].idx,
2141                                         !active, NFC_RF_INITIATOR);
2142
2143 error:
2144         dev_kfree_skb(resp);
2145         return rc;
2146 }
2147
2148 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
2149 #define PASSIVE_DATA_LEN 5
2150 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
2151                              u8 comm_mode, u8 *gb, size_t gb_len)
2152 {
2153         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2154         struct sk_buff *skb;
2155         int rc, skb_len;
2156         u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
2157         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
2158
2159         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2160
2161         if (dev->poll_mod_count) {
2162                 nfc_err(&dev->interface->dev,
2163                         "Cannot bring the DEP link up while polling\n");
2164                 return -EBUSY;
2165         }
2166
2167         if (dev->tgt_active_prot) {
2168                 nfc_err(&dev->interface->dev,
2169                         "There is already an active target\n");
2170                 return -EBUSY;
2171         }
2172
2173         skb_len = 3 + gb_len; /* ActPass + BR + Next */
2174         skb_len += PASSIVE_DATA_LEN;
2175
2176         /* NFCID3 */
2177         skb_len += NFC_NFCID3_MAXSIZE;
2178         if (target && !target->nfcid2_len) {
2179                 nfcid3[0] = 0x1;
2180                 nfcid3[1] = 0xfe;
2181                 get_random_bytes(nfcid3 + 2, 6);
2182         }
2183
2184         skb = pn533_alloc_skb(dev, skb_len);
2185         if (!skb)
2186                 return -ENOMEM;
2187
2188         *skb_put(skb, 1) = !comm_mode;  /* ActPass */
2189         *skb_put(skb, 1) = 0x02;  /* 424 kbps */
2190
2191         next = skb_put(skb, 1);  /* Next */
2192         *next = 0;
2193
2194         /* Copy passive data */
2195         memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
2196         *next |= 1;
2197
2198         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
2199         if (target && target->nfcid2_len)
2200                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
2201                        target->nfcid2_len);
2202         else
2203                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
2204                        NFC_NFCID3_MAXSIZE);
2205         *next |= 2;
2206
2207         if (gb != NULL && gb_len > 0) {
2208                 memcpy(skb_put(skb, gb_len), gb, gb_len);
2209                 *next |= 4; /* We have some Gi */
2210         } else {
2211                 *next = 0;
2212         }
2213
2214         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2215         if (!arg) {
2216                 dev_kfree_skb(skb);
2217                 return -ENOMEM;
2218         }
2219
2220         *arg = !comm_mode;
2221
2222         pn533_rf_field(dev->nfc_dev, 0);
2223
2224         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
2225                                   pn533_in_dep_link_up_complete, arg);
2226
2227         if (rc < 0) {
2228                 dev_kfree_skb(skb);
2229                 kfree(arg);
2230         }
2231
2232         return rc;
2233 }
2234
2235 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
2236 {
2237         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2238
2239         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2240
2241         pn533_poll_reset_mod_list(dev);
2242
2243         if (dev->tgt_mode || dev->tgt_active_prot)
2244                 pn533_abort_cmd(dev, GFP_KERNEL);
2245
2246         dev->tgt_active_prot = 0;
2247         dev->tgt_mode = 0;
2248
2249         skb_queue_purge(&dev->resp_q);
2250
2251         return 0;
2252 }
2253
2254 struct pn533_data_exchange_arg {
2255         data_exchange_cb_t cb;
2256         void *cb_context;
2257 };
2258
2259 static struct sk_buff *pn533_build_response(struct pn533 *dev)
2260 {
2261         struct sk_buff *skb, *tmp, *t;
2262         unsigned int skb_len = 0, tmp_len = 0;
2263
2264         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2265
2266         if (skb_queue_empty(&dev->resp_q))
2267                 return NULL;
2268
2269         if (skb_queue_len(&dev->resp_q) == 1) {
2270                 skb = skb_dequeue(&dev->resp_q);
2271                 goto out;
2272         }
2273
2274         skb_queue_walk_safe(&dev->resp_q, tmp, t)
2275                 skb_len += tmp->len;
2276
2277         dev_dbg(&dev->interface->dev, "%s total length %d\n",
2278                 __func__, skb_len);
2279
2280         skb = alloc_skb(skb_len, GFP_KERNEL);
2281         if (skb == NULL)
2282                 goto out;
2283
2284         skb_put(skb, skb_len);
2285
2286         skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2287                 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2288                 tmp_len += tmp->len;
2289         }
2290
2291 out:
2292         skb_queue_purge(&dev->resp_q);
2293
2294         return skb;
2295 }
2296
2297 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2298                                         struct sk_buff *resp)
2299 {
2300         struct pn533_data_exchange_arg *arg = _arg;
2301         struct sk_buff *skb;
2302         int rc = 0;
2303         u8 status, ret, mi;
2304
2305         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2306
2307         if (IS_ERR(resp)) {
2308                 rc = PTR_ERR(resp);
2309                 goto _error;
2310         }
2311
2312         status = resp->data[0];
2313         ret = status & PN533_CMD_RET_MASK;
2314         mi = status & PN533_CMD_MI_MASK;
2315
2316         skb_pull(resp, sizeof(status));
2317
2318         if (ret != PN533_CMD_RET_SUCCESS) {
2319                 nfc_err(&dev->interface->dev,
2320                         "Exchanging data failed (error 0x%x)\n", ret);
2321                 rc = -EIO;
2322                 goto error;
2323         }
2324
2325         skb_queue_tail(&dev->resp_q, resp);
2326
2327         if (mi) {
2328                 dev->cmd_complete_mi_arg = arg;
2329                 queue_work(dev->wq, &dev->mi_rx_work);
2330                 return -EINPROGRESS;
2331         }
2332
2333         /* Prepare for the next round */
2334         if (skb_queue_len(&dev->fragment_skb) > 0) {
2335                 dev->cmd_complete_dep_arg = arg;
2336                 queue_work(dev->wq, &dev->mi_tx_work);
2337
2338                 return -EINPROGRESS;
2339         }
2340
2341         skb = pn533_build_response(dev);
2342         if (!skb)
2343                 goto error;
2344
2345         arg->cb(arg->cb_context, skb, 0);
2346         kfree(arg);
2347         return 0;
2348
2349 error:
2350         dev_kfree_skb(resp);
2351 _error:
2352         skb_queue_purge(&dev->resp_q);
2353         arg->cb(arg->cb_context, NULL, rc);
2354         kfree(arg);
2355         return rc;
2356 }
2357
2358 /* Split the Tx skb into small chunks */
2359 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2360 {
2361         struct sk_buff *frag;
2362         int  frag_size;
2363
2364         do {
2365                 /* Remaining size */
2366                 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2367                         frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2368                 else
2369                         frag_size = skb->len;
2370
2371                 /* Allocate and reserve */
2372                 frag = pn533_alloc_skb(dev, frag_size);
2373                 if (!frag) {
2374                         skb_queue_purge(&dev->fragment_skb);
2375                         break;
2376                 }
2377
2378                 /* Reserve the TG/MI byte */
2379                 skb_reserve(frag, 1);
2380
2381                 /* MI + TG */
2382                 if (frag_size  == PN533_CMD_DATAFRAME_MAXLEN)
2383                         *skb_push(frag, sizeof(u8)) = (PN533_CMD_MI_MASK | 1);
2384                 else
2385                         *skb_push(frag, sizeof(u8)) =  1; /* TG */
2386
2387                 memcpy(skb_put(frag, frag_size), skb->data, frag_size);
2388
2389                 /* Reduce the size of incoming buffer */
2390                 skb_pull(skb, frag_size);
2391
2392                 /* Add this to skb_queue */
2393                 skb_queue_tail(&dev->fragment_skb, frag);
2394
2395         } while (skb->len > 0);
2396
2397         dev_kfree_skb(skb);
2398
2399         return skb_queue_len(&dev->fragment_skb);
2400 }
2401
2402 static int pn533_transceive(struct nfc_dev *nfc_dev,
2403                             struct nfc_target *target, struct sk_buff *skb,
2404                             data_exchange_cb_t cb, void *cb_context)
2405 {
2406         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2407         struct pn533_data_exchange_arg *arg = NULL;
2408         int rc;
2409
2410         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2411
2412         if (!dev->tgt_active_prot) {
2413                 nfc_err(&dev->interface->dev,
2414                         "Can't exchange data if there is no active target\n");
2415                 rc = -EINVAL;
2416                 goto error;
2417         }
2418
2419         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2420         if (!arg) {
2421                 rc = -ENOMEM;
2422                 goto error;
2423         }
2424
2425         arg->cb = cb;
2426         arg->cb_context = cb_context;
2427
2428         switch (dev->device_type) {
2429         case PN533_DEVICE_PASORI:
2430                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2431                         rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2432                                                    skb,
2433                                                    pn533_data_exchange_complete,
2434                                                    arg);
2435
2436                         break;
2437                 }
2438         default:
2439                 /* jumbo frame ? */
2440                 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2441                         rc = pn533_fill_fragment_skbs(dev, skb);
2442                         if (rc <= 0)
2443                                 goto error;
2444
2445                         skb = skb_dequeue(&dev->fragment_skb);
2446                         if (!skb) {
2447                                 rc = -EIO;
2448                                 goto error;
2449                         }
2450                 } else {
2451                         *skb_push(skb, sizeof(u8)) =  1; /* TG */
2452                 }
2453
2454                 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2455                                            skb, pn533_data_exchange_complete,
2456                                            arg);
2457
2458                 break;
2459         }
2460
2461         if (rc < 0) /* rc from send_async */
2462                 goto error;
2463
2464         return 0;
2465
2466 error:
2467         kfree(arg);
2468         dev_kfree_skb(skb);
2469         return rc;
2470 }
2471
2472 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2473                                   struct sk_buff *resp)
2474 {
2475         u8 status;
2476
2477         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2478
2479         if (IS_ERR(resp))
2480                 return PTR_ERR(resp);
2481
2482         status = resp->data[0];
2483
2484         dev_kfree_skb(resp);
2485
2486         if (status != 0) {
2487                 nfc_tm_deactivated(dev->nfc_dev);
2488
2489                 dev->tgt_mode = 0;
2490
2491                 return 0;
2492         }
2493
2494         queue_work(dev->wq, &dev->tg_work);
2495
2496         return 0;
2497 }
2498
2499 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2500 {
2501         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2502         int rc;
2503
2504         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2505
2506         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2507                 nfc_err(&dev->interface->dev,
2508                         "Data length greater than the max allowed: %d\n",
2509                         PN533_CMD_DATAEXCH_DATA_MAXLEN);
2510                 return -ENOSYS;
2511         }
2512
2513         rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2514                                    pn533_tm_send_complete, NULL);
2515         if (rc < 0)
2516                 dev_kfree_skb(skb);
2517
2518         return rc;
2519 }
2520
2521 static void pn533_wq_mi_recv(struct work_struct *work)
2522 {
2523         struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2524         struct sk_buff *skb;
2525         int rc;
2526
2527         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2528
2529         skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2530         if (!skb)
2531                 goto error;
2532
2533         switch (dev->device_type) {
2534         case PN533_DEVICE_PASORI:
2535                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2536                         rc = pn533_send_cmd_direct_async(dev,
2537                                                 PN533_CMD_IN_COMM_THRU,
2538                                                 skb,
2539                                                 pn533_data_exchange_complete,
2540                                                  dev->cmd_complete_mi_arg);
2541
2542                         break;
2543                 }
2544         default:
2545                 *skb_put(skb, sizeof(u8)) =  1; /*TG*/
2546
2547                 rc = pn533_send_cmd_direct_async(dev,
2548                                                  PN533_CMD_IN_DATA_EXCHANGE,
2549                                                  skb,
2550                                                  pn533_data_exchange_complete,
2551                                                  dev->cmd_complete_mi_arg);
2552
2553                 break;
2554         }
2555
2556         if (rc == 0) /* success */
2557                 return;
2558
2559         nfc_err(&dev->interface->dev,
2560                 "Error %d when trying to perform data_exchange\n", rc);
2561
2562         dev_kfree_skb(skb);
2563         kfree(dev->cmd_complete_mi_arg);
2564
2565 error:
2566         pn533_send_ack(dev, GFP_KERNEL);
2567         queue_work(dev->wq, &dev->cmd_work);
2568 }
2569
2570 static void pn533_wq_mi_send(struct work_struct *work)
2571 {
2572         struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2573         struct sk_buff *skb;
2574         int rc;
2575
2576         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2577
2578         /* Grab the first skb in the queue */
2579         skb = skb_dequeue(&dev->fragment_skb);
2580
2581         if (skb == NULL) {      /* No more data */
2582                 /* Reset the queue for future use */
2583                 skb_queue_head_init(&dev->fragment_skb);
2584                 goto error;
2585         }
2586
2587         switch (dev->device_type) {
2588         case PN533_DEVICE_PASORI:
2589                 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2590                         rc = -EIO;
2591                         break;
2592                 }
2593
2594                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2595                                                  skb,
2596                                                  pn533_data_exchange_complete,
2597                                                  dev->cmd_complete_dep_arg);
2598
2599                 break;
2600
2601         default:
2602                 /* Still some fragments? */
2603                 rc = pn533_send_cmd_direct_async(dev,PN533_CMD_IN_DATA_EXCHANGE,
2604                                                  skb,
2605                                                  pn533_data_exchange_complete,
2606                                                  dev->cmd_complete_dep_arg);
2607
2608                 break;
2609         }
2610
2611         if (rc == 0) /* success */
2612                 return;
2613
2614         nfc_err(&dev->interface->dev,
2615                 "Error %d when trying to perform data_exchange\n", rc);
2616
2617         dev_kfree_skb(skb);
2618         kfree(dev->cmd_complete_dep_arg);
2619
2620 error:
2621         pn533_send_ack(dev, GFP_KERNEL);
2622         queue_work(dev->wq, &dev->cmd_work);
2623 }
2624
2625 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2626                                                                 u8 cfgdata_len)
2627 {
2628         struct sk_buff *skb;
2629         struct sk_buff *resp;
2630         int skb_len;
2631
2632         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2633
2634         skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2635
2636         skb = pn533_alloc_skb(dev, skb_len);
2637         if (!skb)
2638                 return -ENOMEM;
2639
2640         *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2641         memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2642
2643         resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2644         if (IS_ERR(resp))
2645                 return PTR_ERR(resp);
2646
2647         dev_kfree_skb(resp);
2648         return 0;
2649 }
2650
2651 static int pn533_get_firmware_version(struct pn533 *dev,
2652                                       struct pn533_fw_version *fv)
2653 {
2654         struct sk_buff *skb;
2655         struct sk_buff *resp;
2656
2657         skb = pn533_alloc_skb(dev, 0);
2658         if (!skb)
2659                 return -ENOMEM;
2660
2661         resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2662         if (IS_ERR(resp))
2663                 return PTR_ERR(resp);
2664
2665         fv->ic = resp->data[0];
2666         fv->ver = resp->data[1];
2667         fv->rev = resp->data[2];
2668         fv->support = resp->data[3];
2669
2670         dev_kfree_skb(resp);
2671         return 0;
2672 }
2673
2674 static int pn533_pasori_fw_reset(struct pn533 *dev)
2675 {
2676         struct sk_buff *skb;
2677         struct sk_buff *resp;
2678
2679         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2680
2681         skb = pn533_alloc_skb(dev, sizeof(u8));
2682         if (!skb)
2683                 return -ENOMEM;
2684
2685         *skb_put(skb, sizeof(u8)) = 0x1;
2686
2687         resp = pn533_send_cmd_sync(dev, 0x18, skb);
2688         if (IS_ERR(resp))
2689                 return PTR_ERR(resp);
2690
2691         dev_kfree_skb(resp);
2692
2693         return 0;
2694 }
2695
2696 struct pn533_acr122_poweron_rdr_arg {
2697         int rc;
2698         struct completion done;
2699 };
2700
2701 static void pn533_acr122_poweron_rdr_resp(struct urb *urb)
2702 {
2703         struct pn533_acr122_poweron_rdr_arg *arg = urb->context;
2704
2705         dev_dbg(&urb->dev->dev, "%s\n", __func__);
2706
2707         print_hex_dump_debug("ACR122 RX: ", DUMP_PREFIX_NONE, 16, 1,
2708                        urb->transfer_buffer, urb->transfer_buffer_length,
2709                        false);
2710
2711         arg->rc = urb->status;
2712         complete(&arg->done);
2713 }
2714
2715 static int pn533_acr122_poweron_rdr(struct pn533 *dev)
2716 {
2717         /* Power on th reader (CCID cmd) */
2718         u8 cmd[10] = {PN533_ACR122_PC_TO_RDR_ICCPOWERON,
2719                       0, 0, 0, 0, 0, 0, 3, 0, 0};
2720         u8 buf[255];
2721         int rc;
2722         void *cntx;
2723         struct pn533_acr122_poweron_rdr_arg arg;
2724
2725         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2726
2727         init_completion(&arg.done);
2728         cntx = dev->in_urb->context;  /* backup context */
2729
2730         dev->in_urb->transfer_buffer = buf;
2731         dev->in_urb->transfer_buffer_length = 255;
2732         dev->in_urb->complete = pn533_acr122_poweron_rdr_resp;
2733         dev->in_urb->context = &arg;
2734
2735         dev->out_urb->transfer_buffer = cmd;
2736         dev->out_urb->transfer_buffer_length = sizeof(cmd);
2737
2738         print_hex_dump_debug("ACR122 TX: ", DUMP_PREFIX_NONE, 16, 1,
2739                        cmd, sizeof(cmd), false);
2740
2741         rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
2742         if (rc) {
2743                 nfc_err(&dev->interface->dev,
2744                         "Reader power on cmd error %d\n", rc);
2745                 return rc;
2746         }
2747
2748         rc =  usb_submit_urb(dev->in_urb, GFP_KERNEL);
2749         if (rc) {
2750                 nfc_err(&dev->interface->dev,
2751                         "Can't submit reader poweron cmd response %d\n", rc);
2752                 return rc;
2753         }
2754
2755         wait_for_completion(&arg.done);
2756         dev->in_urb->context = cntx; /* restore context */
2757
2758         return arg.rc;
2759 }
2760
2761 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2762 {
2763         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2764         u8 rf_field = !!rf;
2765         int rc;
2766
2767         rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2768
2769         rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2770                                      (u8 *)&rf_field, 1);
2771         if (rc) {
2772                 nfc_err(&dev->interface->dev, "Error on setting RF field\n");
2773                 return rc;
2774         }
2775
2776         return rc;
2777 }
2778
2779 int pn533_dev_up(struct nfc_dev *nfc_dev)
2780 {
2781         return pn533_rf_field(nfc_dev, 1);
2782 }
2783
2784 int pn533_dev_down(struct nfc_dev *nfc_dev)
2785 {
2786         return pn533_rf_field(nfc_dev, 0);
2787 }
2788
2789 static struct nfc_ops pn533_nfc_ops = {
2790         .dev_up = pn533_dev_up,
2791         .dev_down = pn533_dev_down,
2792         .dep_link_up = pn533_dep_link_up,
2793         .dep_link_down = pn533_dep_link_down,
2794         .start_poll = pn533_start_poll,
2795         .stop_poll = pn533_stop_poll,
2796         .activate_target = pn533_activate_target,
2797         .deactivate_target = pn533_deactivate_target,
2798         .im_transceive = pn533_transceive,
2799         .tm_send = pn533_tm_send,
2800 };
2801
2802 static int pn533_setup(struct pn533 *dev)
2803 {
2804         struct pn533_config_max_retries max_retries;
2805         struct pn533_config_timing timing;
2806         u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2807         int rc;
2808
2809         switch (dev->device_type) {
2810         case PN533_DEVICE_STD:
2811         case PN533_DEVICE_PASORI:
2812         case PN533_DEVICE_ACR122U:
2813                 max_retries.mx_rty_atr = 0x2;
2814                 max_retries.mx_rty_psl = 0x1;
2815                 max_retries.mx_rty_passive_act =
2816                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2817
2818                 timing.rfu = PN533_CONFIG_TIMING_102;
2819                 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2820                 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2821
2822                 break;
2823
2824         default:
2825                 nfc_err(&dev->interface->dev, "Unknown device type %d\n",
2826                         dev->device_type);
2827                 return -EINVAL;
2828         }
2829
2830         rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2831                                      (u8 *)&max_retries, sizeof(max_retries));
2832         if (rc) {
2833                 nfc_err(&dev->interface->dev,
2834                         "Error on setting MAX_RETRIES config\n");
2835                 return rc;
2836         }
2837
2838
2839         rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2840                                      (u8 *)&timing, sizeof(timing));
2841         if (rc) {
2842                 nfc_err(&dev->interface->dev, "Error on setting RF timings\n");
2843                 return rc;
2844         }
2845
2846         switch (dev->device_type) {
2847         case PN533_DEVICE_STD:
2848                 break;
2849
2850         case PN533_DEVICE_PASORI:
2851                 pn533_pasori_fw_reset(dev);
2852
2853                 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2854                                              pasori_cfg, 3);
2855                 if (rc) {
2856                         nfc_err(&dev->interface->dev,
2857                                 "Error while settings PASORI config\n");
2858                         return rc;
2859                 }
2860
2861                 pn533_pasori_fw_reset(dev);
2862
2863                 break;
2864         }
2865
2866         return 0;
2867 }
2868
2869 static int pn533_probe(struct usb_interface *interface,
2870                         const struct usb_device_id *id)
2871 {
2872         struct pn533_fw_version fw_ver;
2873         struct pn533 *dev;
2874         struct usb_host_interface *iface_desc;
2875         struct usb_endpoint_descriptor *endpoint;
2876         int in_endpoint = 0;
2877         int out_endpoint = 0;
2878         int rc = -ENOMEM;
2879         int i;
2880         u32 protocols;
2881
2882         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2883         if (!dev)
2884                 return -ENOMEM;
2885
2886         dev->udev = usb_get_dev(interface_to_usbdev(interface));
2887         dev->interface = interface;
2888         mutex_init(&dev->cmd_lock);
2889
2890         iface_desc = interface->cur_altsetting;
2891         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
2892                 endpoint = &iface_desc->endpoint[i].desc;
2893
2894                 if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
2895                         in_endpoint = endpoint->bEndpointAddress;
2896
2897                 if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
2898                         out_endpoint = endpoint->bEndpointAddress;
2899         }
2900
2901         if (!in_endpoint || !out_endpoint) {
2902                 nfc_err(&interface->dev,
2903                         "Could not find bulk-in or bulk-out endpoint\n");
2904                 rc = -ENODEV;
2905                 goto error;
2906         }
2907
2908         dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
2909         dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
2910
2911         if (!dev->in_urb || !dev->out_urb)
2912                 goto error;
2913
2914         usb_fill_bulk_urb(dev->in_urb, dev->udev,
2915                           usb_rcvbulkpipe(dev->udev, in_endpoint),
2916                           NULL, 0, NULL, dev);
2917         usb_fill_bulk_urb(dev->out_urb, dev->udev,
2918                           usb_sndbulkpipe(dev->udev, out_endpoint),
2919                           NULL, 0, pn533_send_complete, dev);
2920
2921         INIT_WORK(&dev->cmd_work, pn533_wq_cmd);
2922         INIT_WORK(&dev->cmd_complete_work, pn533_wq_cmd_complete);
2923         INIT_WORK(&dev->mi_rx_work, pn533_wq_mi_recv);
2924         INIT_WORK(&dev->mi_tx_work, pn533_wq_mi_send);
2925         INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
2926         INIT_DELAYED_WORK(&dev->poll_work, pn533_wq_poll);
2927         INIT_WORK(&dev->rf_work, pn533_wq_rf);
2928         dev->wq = alloc_ordered_workqueue("pn533", 0);
2929         if (dev->wq == NULL)
2930                 goto error;
2931
2932         init_timer(&dev->listen_timer);
2933         dev->listen_timer.data = (unsigned long) dev;
2934         dev->listen_timer.function = pn533_listen_mode_timer;
2935
2936         skb_queue_head_init(&dev->resp_q);
2937         skb_queue_head_init(&dev->fragment_skb);
2938
2939         INIT_LIST_HEAD(&dev->cmd_queue);
2940
2941         usb_set_intfdata(interface, dev);
2942
2943         dev->ops = &pn533_std_frame_ops;
2944
2945         dev->protocol_type = PN533_PROTO_REQ_ACK_RESP;
2946         dev->device_type = id->driver_info;
2947         switch (dev->device_type) {
2948         case PN533_DEVICE_STD:
2949                 protocols = PN533_ALL_PROTOCOLS;
2950                 break;
2951
2952         case PN533_DEVICE_PASORI:
2953                 protocols = PN533_NO_TYPE_B_PROTOCOLS;
2954                 break;
2955
2956         case PN533_DEVICE_ACR122U:
2957                 protocols = PN533_NO_TYPE_B_PROTOCOLS;
2958                 dev->ops = &pn533_acr122_frame_ops;
2959                 dev->protocol_type = PN533_PROTO_REQ_RESP,
2960
2961                 rc = pn533_acr122_poweron_rdr(dev);
2962                 if (rc < 0) {
2963                         nfc_err(&dev->interface->dev,
2964                                 "Couldn't poweron the reader (error %d)\n", rc);
2965                         goto destroy_wq;
2966                 }
2967                 break;
2968
2969         default:
2970                 nfc_err(&dev->interface->dev, "Unknown device type %d\n",
2971                         dev->device_type);
2972                 rc = -EINVAL;
2973                 goto destroy_wq;
2974         }
2975
2976         memset(&fw_ver, 0, sizeof(fw_ver));
2977         rc = pn533_get_firmware_version(dev, &fw_ver);
2978         if (rc < 0)
2979                 goto destroy_wq;
2980
2981         nfc_info(&dev->interface->dev,
2982                  "NXP PN5%02X firmware ver %d.%d now attached\n",
2983                  fw_ver.ic, fw_ver.ver, fw_ver.rev);
2984
2985
2986         dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2987                                            dev->ops->tx_header_len +
2988                                            PN533_CMD_DATAEXCH_HEAD_LEN,
2989                                            dev->ops->tx_tail_len);
2990         if (!dev->nfc_dev) {
2991                 rc = -ENOMEM;
2992                 goto destroy_wq;
2993         }
2994
2995         nfc_set_parent_dev(dev->nfc_dev, &interface->dev);
2996         nfc_set_drvdata(dev->nfc_dev, dev);
2997
2998         rc = nfc_register_device(dev->nfc_dev);
2999         if (rc)
3000                 goto free_nfc_dev;
3001
3002         rc = pn533_setup(dev);
3003         if (rc)
3004                 goto unregister_nfc_dev;
3005
3006         return 0;
3007
3008 unregister_nfc_dev:
3009         nfc_unregister_device(dev->nfc_dev);
3010
3011 free_nfc_dev:
3012         nfc_free_device(dev->nfc_dev);
3013
3014 destroy_wq:
3015         destroy_workqueue(dev->wq);
3016 error:
3017         usb_free_urb(dev->in_urb);
3018         usb_free_urb(dev->out_urb);
3019         usb_put_dev(dev->udev);
3020         kfree(dev);
3021         return rc;
3022 }
3023
3024 static void pn533_disconnect(struct usb_interface *interface)
3025 {
3026         struct pn533 *dev;
3027         struct pn533_cmd *cmd, *n;
3028
3029         dev = usb_get_intfdata(interface);
3030         usb_set_intfdata(interface, NULL);
3031
3032         nfc_unregister_device(dev->nfc_dev);
3033         nfc_free_device(dev->nfc_dev);
3034
3035         usb_kill_urb(dev->in_urb);
3036         usb_kill_urb(dev->out_urb);
3037
3038         flush_delayed_work(&dev->poll_work);
3039         destroy_workqueue(dev->wq);
3040
3041         skb_queue_purge(&dev->resp_q);
3042
3043         del_timer(&dev->listen_timer);
3044
3045         list_for_each_entry_safe(cmd, n, &dev->cmd_queue, queue) {
3046                 list_del(&cmd->queue);
3047                 kfree(cmd);
3048         }
3049
3050         usb_free_urb(dev->in_urb);
3051         usb_free_urb(dev->out_urb);
3052         kfree(dev);
3053
3054         nfc_info(&interface->dev, "NXP PN533 NFC device disconnected\n");
3055 }
3056
3057 static struct usb_driver pn533_driver = {
3058         .name =         "pn533",
3059         .probe =        pn533_probe,
3060         .disconnect =   pn533_disconnect,
3061         .id_table =     pn533_table,
3062 };
3063
3064 module_usb_driver(pn533_driver);
3065
3066 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
3067 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
3068 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
3069 MODULE_DESCRIPTION("PN533 usb driver ver " VERSION);
3070 MODULE_VERSION(VERSION);
3071 MODULE_LICENSE("GPL");