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_dev_err(&dev->interface->dev,
 732                             "Urb failure (status %d)", urb->status);
 733                 goto sched_wq;
 734         }
 735
 736         in_frame = dev->in_urb->transfer_buffer;
 737
 738         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_dev_err(&dev->interface->dev, "Received an invalid frame");
 744                 cmd->status = -EIO;
 745                 goto sched_wq;
 746         }
 747
 748         if (!pn533_rx_frame_is_cmd_response(dev, in_frame)) {
 749                 nfc_dev_err(&dev->interface->dev,
 750                             "It it not the response to the last command");
 751                 cmd->status = -EIO;
 752                 goto sched_wq;
 753         }
 754
 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_dev_err(&dev->interface->dev,
 787                             "Urb failure (status %d)", urb->status);
 788                 goto sched_wq;
 789         }
 790
 791         in_frame = dev->in_urb->transfer_buffer;
 792
 793         if (!pn533_std_rx_frame_is_ack(in_frame)) {
 794                 nfc_dev_err(&dev->interface->dev, "Received an invalid ack");
 795                 cmd->status = -EIO;
 796                 goto sched_wq;
 797         }
 798
 799         rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
 800         if (rc) {
 801                 nfc_dev_err(&dev->interface->dev,
 802                             "usb_submit_urb failed with result %d", rc);
 803                 cmd->status = rc;
 804                 goto sched_wq;
 805         }
 806
 807         return;
 808
 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_dev_err(&dev->interface->dev,
1176                             "Urb failure (status %d)", 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_dev_err(&dev->interface->dev,
1477                             "Unknown current poll modulation");
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_dev_err(&dev->interface->dev,
1699                             "Error when signaling target activation");
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_dev_err(&dev->interface->dev, "%s RF setting error %d",
1734                             __func__, rc);
1735
1736                 return rc;
1737         }
1738
1739         queue_delayed_work(dev->wq, &dev->poll_work,
1740                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1741
1742         dev_kfree_skb(resp);
1743         return rc;
1744 }
1745
1746 static void pn533_wq_rf(struct work_struct *work)
1747 {
1748         struct pn533 *dev = container_of(work, struct pn533, rf_work);
1749         struct sk_buff *skb;
1750         int rc;
1751
1752         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1753
1754         skb = pn533_alloc_skb(dev, 2);
1755         if (!skb)
1756                 return;
1757
1758         *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD;
1759         *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
1760
1761         rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1762                                   pn533_rf_complete, NULL);
1763         if (rc < 0) {
1764                 dev_kfree_skb(skb);
1765                 nfc_dev_err(&dev->interface->dev, "RF setting error %d", rc);
1766         }
1767
1768         return;
1769 }
1770
1771 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1772                                struct sk_buff *resp)
1773 {
1774         struct pn533_poll_modulations *cur_mod;
1775         int rc;
1776
1777         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1778
1779         if (IS_ERR(resp)) {
1780                 rc = PTR_ERR(resp);
1781
1782                 nfc_dev_err(&dev->interface->dev, "%s  Poll complete error %d",
1783                             __func__, rc);
1784
1785                 if (rc == -ENOENT) {
1786                         if (dev->poll_mod_count != 0)
1787                                 return rc;
1788                         else
1789                                 goto stop_poll;
1790                 } else if (rc < 0) {
1791                         nfc_dev_err(&dev->interface->dev,
1792                                     "Error %d when running poll", rc);
1793                         goto stop_poll;
1794                 }
1795         }
1796
1797         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1798
1799         if (cur_mod->len == 0) { /* Target mode */
1800                 del_timer(&dev->listen_timer);
1801                 rc = pn533_init_target_complete(dev, resp);
1802                 goto done;
1803         }
1804
1805         /* Initiator mode */
1806         rc = pn533_start_poll_complete(dev, resp);
1807         if (!rc)
1808                 goto done;
1809
1810         if (!dev->poll_mod_count) {
1811                 dev_dbg(&dev->interface->dev, "Polling has been stopped\n");
1812                 goto done;
1813         }
1814
1815         pn533_poll_next_mod(dev);
1816         /* Not target found, turn radio off */
1817         queue_work(dev->wq, &dev->rf_work);
1818
1819 done:
1820         dev_kfree_skb(resp);
1821         return rc;
1822
1823 stop_poll:
1824         nfc_dev_err(&dev->interface->dev, "Polling operation has been stopped");
1825
1826         pn533_poll_reset_mod_list(dev);
1827         dev->poll_protocols = 0;
1828         return rc;
1829 }
1830
1831 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1832                                         struct pn533_poll_modulations *mod)
1833 {
1834         struct sk_buff *skb;
1835
1836         skb = pn533_alloc_skb(dev, mod->len);
1837         if (!skb)
1838                 return NULL;
1839
1840         memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
1841
1842         return skb;
1843 }
1844
1845 static int pn533_send_poll_frame(struct pn533 *dev)
1846 {
1847         struct pn533_poll_modulations *mod;
1848         struct sk_buff *skb;
1849         int rc;
1850         u8 cmd_code;
1851
1852         mod = dev->poll_mod_active[dev->poll_mod_curr];
1853
1854         dev_dbg(&dev->interface->dev, "%s mod len %d\n",
1855                 __func__, mod->len);
1856
1857         if (mod->len == 0) {  /* Listen mode */
1858                 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1859                 skb = pn533_alloc_poll_tg_frame(dev);
1860         } else {  /* Polling mode */
1861                 cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
1862                 skb = pn533_alloc_poll_in_frame(dev, mod);
1863         }
1864
1865         if (!skb) {
1866                 nfc_dev_err(&dev->interface->dev, "Failed to allocate skb.");
1867                 return -ENOMEM;
1868         }
1869
1870         rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1871                                   NULL);
1872         if (rc < 0) {
1873                 dev_kfree_skb(skb);
1874                 nfc_dev_err(&dev->interface->dev, "Polling loop error %d", rc);
1875         }
1876
1877         return rc;
1878 }
1879
1880 static void pn533_wq_poll(struct work_struct *work)
1881 {
1882         struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1883         struct pn533_poll_modulations *cur_mod;
1884         int rc;
1885
1886         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1887
1888         dev_dbg(&dev->interface->dev,
1889                 "%s cancel_listen %d modulation len %d\n",
1890                 __func__, dev->cancel_listen, cur_mod->len);
1891
1892         if (dev->cancel_listen == 1) {
1893                 dev->cancel_listen = 0;
1894                 pn533_abort_cmd(dev, GFP_ATOMIC);
1895         }
1896
1897         rc = pn533_send_poll_frame(dev);
1898         if (rc)
1899                 return;
1900
1901         if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1902                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1903
1904         return;
1905 }
1906
1907 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1908                             u32 im_protocols, u32 tm_protocols)
1909 {
1910         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1911         u8 rand_mod;
1912
1913         dev_dbg(&dev->interface->dev,
1914                 "%s: im protocols 0x%x tm protocols 0x%x\n",
1915                 __func__, im_protocols, tm_protocols);
1916
1917         if (dev->tgt_active_prot) {
1918                 nfc_dev_err(&dev->interface->dev,
1919                             "Cannot poll with a target already activated");
1920                 return -EBUSY;
1921         }
1922
1923         if (dev->tgt_mode) {
1924                 nfc_dev_err(&dev->interface->dev,
1925                             "Cannot poll while already being activated");
1926                 return -EBUSY;
1927         }
1928
1929         if (tm_protocols) {
1930                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1931                 if (dev->gb == NULL)
1932                         tm_protocols = 0;
1933         }
1934
1935         pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1936         dev->poll_protocols = im_protocols;
1937         dev->listen_protocols = tm_protocols;
1938
1939         /* Do not always start polling from the same modulation */
1940         get_random_bytes(&rand_mod, sizeof(rand_mod));
1941         rand_mod %= dev->poll_mod_count;
1942         dev->poll_mod_curr = rand_mod;
1943
1944         return pn533_send_poll_frame(dev);
1945 }
1946
1947 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1948 {
1949         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1950
1951         del_timer(&dev->listen_timer);
1952
1953         if (!dev->poll_mod_count) {
1954                 dev_dbg(&dev->interface->dev,
1955                         "Polling operation was not running\n");
1956                 return;
1957         }
1958
1959         pn533_abort_cmd(dev, GFP_KERNEL);
1960         flush_delayed_work(&dev->poll_work);
1961         pn533_poll_reset_mod_list(dev);
1962 }
1963
1964 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1965 {
1966         struct pn533_cmd_activate_response *rsp;
1967         u16 gt_len;
1968         int rc;
1969         struct sk_buff *skb;
1970         struct sk_buff *resp;
1971
1972         dev_dbg(&dev->interface->dev, "%s\n", __func__);
1973
1974         skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1975         if (!skb)
1976                 return -ENOMEM;
1977
1978         *skb_put(skb, sizeof(u8)) = 1; /* TG */
1979         *skb_put(skb, sizeof(u8)) = 0; /* Next */
1980
1981         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1982         if (IS_ERR(resp))
1983                 return PTR_ERR(resp);
1984
1985         rsp = (struct pn533_cmd_activate_response *)resp->data;
1986         rc = rsp->status & PN533_CMD_RET_MASK;
1987         if (rc != PN533_CMD_RET_SUCCESS) {
1988                 nfc_dev_err(&dev->interface->dev,
1989                             "Target activation failed (error 0x%x)", rc);
1990                 dev_kfree_skb(resp);
1991                 return -EIO;
1992         }
1993
1994         /* ATR_RES general bytes are located at offset 16 */
1995         gt_len = resp->len - 16;
1996         rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1997
1998         dev_kfree_skb(resp);
1999         return rc;
2000 }
2001
2002 static int pn533_activate_target(struct nfc_dev *nfc_dev,
2003                                  struct nfc_target *target, u32 protocol)
2004 {
2005         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2006         int rc;
2007
2008         dev_dbg(&dev->interface->dev, "%s - protocol=%u\n",
2009                 __func__, protocol);
2010
2011         if (dev->poll_mod_count) {
2012                 dev_err(&dev->interface->dev,
2013                         "Cannot activate while polling\n");
2014                 return -EBUSY;
2015         }
2016
2017         if (dev->tgt_active_prot) {
2018                 nfc_dev_err(&dev->interface->dev,
2019                             "There is already an active target");
2020                 return -EBUSY;
2021         }
2022
2023         if (!dev->tgt_available_prots) {
2024                 nfc_dev_err(&dev->interface->dev,
2025                             "There is no available target to activate");
2026                 return -EINVAL;
2027         }
2028
2029         if (!(dev->tgt_available_prots & (1 << protocol))) {
2030                 nfc_dev_err(&dev->interface->dev,
2031                             "Target doesn't support requested proto %u",
2032                             protocol);
2033                 return -EINVAL;
2034         }
2035
2036         if (protocol == NFC_PROTO_NFC_DEP) {
2037                 rc = pn533_activate_target_nfcdep(dev);
2038                 if (rc) {
2039                         nfc_dev_err(&dev->interface->dev,
2040                                     "Activating target with DEP failed %d", rc);
2041                         return rc;
2042                 }
2043         }
2044
2045         dev->tgt_active_prot = protocol;
2046         dev->tgt_available_prots = 0;
2047
2048         return 0;
2049 }
2050
2051 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
2052                                     struct nfc_target *target)
2053 {
2054         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2055         struct sk_buff *skb;
2056         struct sk_buff *resp;
2057         int rc;
2058
2059         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2060
2061         if (!dev->tgt_active_prot) {
2062                 nfc_dev_err(&dev->interface->dev, "There is no active target");
2063                 return;
2064         }
2065
2066         dev->tgt_active_prot = 0;
2067         skb_queue_purge(&dev->resp_q);
2068
2069         skb = pn533_alloc_skb(dev, sizeof(u8));
2070         if (!skb)
2071                 return;
2072
2073         *skb_put(skb, 1) = 1; /* TG*/
2074
2075         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_RELEASE, skb);
2076         if (IS_ERR(resp))
2077                 return;
2078
2079         rc = resp->data[0] & PN533_CMD_RET_MASK;
2080         if (rc != PN533_CMD_RET_SUCCESS)
2081                 nfc_dev_err(&dev->interface->dev,
2082                             "Error 0x%x when releasing the target", rc);
2083
2084         dev_kfree_skb(resp);
2085         return;
2086 }
2087
2088
2089 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
2090                                          struct sk_buff *resp)
2091 {
2092         struct pn533_cmd_jump_dep_response *rsp;
2093         u8 target_gt_len;
2094         int rc;
2095         u8 active = *(u8 *)arg;
2096
2097         kfree(arg);
2098
2099         if (IS_ERR(resp))
2100                 return PTR_ERR(resp);
2101
2102         if (dev->tgt_available_prots &&
2103             !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
2104                 nfc_dev_err(&dev->interface->dev,
2105                             "The target does not support DEP");
2106                 rc =  -EINVAL;
2107                 goto error;
2108         }
2109
2110         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
2111
2112         rc = rsp->status & PN533_CMD_RET_MASK;
2113         if (rc != PN533_CMD_RET_SUCCESS) {
2114                 nfc_dev_err(&dev->interface->dev,
2115                             "Bringing DEP link up failed (error 0x%x)", rc);
2116                 goto error;
2117         }
2118
2119         if (!dev->tgt_available_prots) {
2120                 struct nfc_target nfc_target;
2121
2122                 dev_dbg(&dev->interface->dev, "Creating new target\n");
2123
2124                 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
2125                 nfc_target.nfcid1_len = 10;
2126                 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
2127                 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
2128                 if (rc)
2129                         goto error;
2130
2131                 dev->tgt_available_prots = 0;
2132         }
2133
2134         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
2135
2136         /* ATR_RES general bytes are located at offset 17 */
2137         target_gt_len = resp->len - 17;
2138         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
2139                                           rsp->gt, target_gt_len);
2140         if (rc == 0)
2141                 rc = nfc_dep_link_is_up(dev->nfc_dev,
2142                                         dev->nfc_dev->targets[0].idx,
2143                                         !active, NFC_RF_INITIATOR);
2144
2145 error:
2146         dev_kfree_skb(resp);
2147         return rc;
2148 }
2149
2150 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
2151 #define PASSIVE_DATA_LEN 5
2152 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
2153                              u8 comm_mode, u8 *gb, size_t gb_len)
2154 {
2155         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2156         struct sk_buff *skb;
2157         int rc, skb_len;
2158         u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
2159         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
2160
2161         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2162
2163         if (dev->poll_mod_count) {
2164                 nfc_dev_err(&dev->interface->dev,
2165                             "Cannot bring the DEP link up while polling");
2166                 return -EBUSY;
2167         }
2168
2169         if (dev->tgt_active_prot) {
2170                 nfc_dev_err(&dev->interface->dev,
2171                             "There is already an active target");
2172                 return -EBUSY;
2173         }
2174
2175         skb_len = 3 + gb_len; /* ActPass + BR + Next */
2176         skb_len += PASSIVE_DATA_LEN;
2177
2178         /* NFCID3 */
2179         skb_len += NFC_NFCID3_MAXSIZE;
2180         if (target && !target->nfcid2_len) {
2181                 nfcid3[0] = 0x1;
2182                 nfcid3[1] = 0xfe;
2183                 get_random_bytes(nfcid3 + 2, 6);
2184         }
2185
2186         skb = pn533_alloc_skb(dev, skb_len);
2187         if (!skb)
2188                 return -ENOMEM;
2189
2190         *skb_put(skb, 1) = !comm_mode;  /* ActPass */
2191         *skb_put(skb, 1) = 0x02;  /* 424 kbps */
2192
2193         next = skb_put(skb, 1);  /* Next */
2194         *next = 0;
2195
2196         /* Copy passive data */
2197         memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
2198         *next |= 1;
2199
2200         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
2201         if (target && target->nfcid2_len)
2202                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
2203                        target->nfcid2_len);
2204         else
2205                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
2206                        NFC_NFCID3_MAXSIZE);
2207         *next |= 2;
2208
2209         if (gb != NULL && gb_len > 0) {
2210                 memcpy(skb_put(skb, gb_len), gb, gb_len);
2211                 *next |= 4; /* We have some Gi */
2212         } else {
2213                 *next = 0;
2214         }
2215
2216         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2217         if (!arg) {
2218                 dev_kfree_skb(skb);
2219                 return -ENOMEM;
2220         }
2221
2222         *arg = !comm_mode;
2223
2224         pn533_rf_field(dev->nfc_dev, 0);
2225
2226         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
2227                                   pn533_in_dep_link_up_complete, arg);
2228
2229         if (rc < 0) {
2230                 dev_kfree_skb(skb);
2231                 kfree(arg);
2232         }
2233
2234         return rc;
2235 }
2236
2237 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
2238 {
2239         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2240
2241         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2242
2243         pn533_poll_reset_mod_list(dev);
2244
2245         if (dev->tgt_mode || dev->tgt_active_prot)
2246                 pn533_abort_cmd(dev, GFP_KERNEL);
2247
2248         dev->tgt_active_prot = 0;
2249         dev->tgt_mode = 0;
2250
2251         skb_queue_purge(&dev->resp_q);
2252
2253         return 0;
2254 }
2255
2256 struct pn533_data_exchange_arg {
2257         data_exchange_cb_t cb;
2258         void *cb_context;
2259 };
2260
2261 static struct sk_buff *pn533_build_response(struct pn533 *dev)
2262 {
2263         struct sk_buff *skb, *tmp, *t;
2264         unsigned int skb_len = 0, tmp_len = 0;
2265
2266         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2267
2268         if (skb_queue_empty(&dev->resp_q))
2269                 return NULL;
2270
2271         if (skb_queue_len(&dev->resp_q) == 1) {
2272                 skb = skb_dequeue(&dev->resp_q);
2273                 goto out;
2274         }
2275
2276         skb_queue_walk_safe(&dev->resp_q, tmp, t)
2277                 skb_len += tmp->len;
2278
2279         dev_dbg(&dev->interface->dev, "%s total length %d\n",
2280                 __func__, skb_len);
2281
2282         skb = alloc_skb(skb_len, GFP_KERNEL);
2283         if (skb == NULL)
2284                 goto out;
2285
2286         skb_put(skb, skb_len);
2287
2288         skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2289                 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2290                 tmp_len += tmp->len;
2291         }
2292
2293 out:
2294         skb_queue_purge(&dev->resp_q);
2295
2296         return skb;
2297 }
2298
2299 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2300                                         struct sk_buff *resp)
2301 {
2302         struct pn533_data_exchange_arg *arg = _arg;
2303         struct sk_buff *skb;
2304         int rc = 0;
2305         u8 status, ret, mi;
2306
2307         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2308
2309         if (IS_ERR(resp)) {
2310                 rc = PTR_ERR(resp);
2311                 goto _error;
2312         }
2313
2314         status = resp->data[0];
2315         ret = status & PN533_CMD_RET_MASK;
2316         mi = status & PN533_CMD_MI_MASK;
2317
2318         skb_pull(resp, sizeof(status));
2319
2320         if (ret != PN533_CMD_RET_SUCCESS) {
2321                 nfc_dev_err(&dev->interface->dev,
2322                             "Exchanging data failed (error 0x%x)", ret);
2323                 rc = -EIO;
2324                 goto error;
2325         }
2326
2327         skb_queue_tail(&dev->resp_q, resp);
2328
2329         if (mi) {
2330                 dev->cmd_complete_mi_arg = arg;
2331                 queue_work(dev->wq, &dev->mi_rx_work);
2332                 return -EINPROGRESS;
2333         }
2334
2335         /* Prepare for the next round */
2336         if (skb_queue_len(&dev->fragment_skb) > 0) {
2337                 dev->cmd_complete_dep_arg = arg;
2338                 queue_work(dev->wq, &dev->mi_tx_work);
2339
2340                 return -EINPROGRESS;
2341         }
2342
2343         skb = pn533_build_response(dev);
2344         if (!skb)
2345                 goto error;
2346
2347         arg->cb(arg->cb_context, skb, 0);
2348         kfree(arg);
2349         return 0;
2350
2351 error:
2352         dev_kfree_skb(resp);
2353 _error:
2354         skb_queue_purge(&dev->resp_q);
2355         arg->cb(arg->cb_context, NULL, rc);
2356         kfree(arg);
2357         return rc;
2358 }
2359
2360 /* Split the Tx skb into small chunks */
2361 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2362 {
2363         struct sk_buff *frag;
2364         int  frag_size;
2365
2366         do {
2367                 /* Remaining size */
2368                 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2369                         frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2370                 else
2371                         frag_size = skb->len;
2372
2373                 /* Allocate and reserve */
2374                 frag = pn533_alloc_skb(dev, frag_size);
2375                 if (!frag) {
2376                         skb_queue_purge(&dev->fragment_skb);
2377                         break;
2378                 }
2379
2380                 /* Reserve the TG/MI byte */
2381                 skb_reserve(frag, 1);
2382
2383                 /* MI + TG */
2384                 if (frag_size  == PN533_CMD_DATAFRAME_MAXLEN)
2385                         *skb_push(frag, sizeof(u8)) = (PN533_CMD_MI_MASK | 1);
2386                 else
2387                         *skb_push(frag, sizeof(u8)) =  1; /* TG */
2388
2389                 memcpy(skb_put(frag, frag_size), skb->data, frag_size);
2390
2391                 /* Reduce the size of incoming buffer */
2392                 skb_pull(skb, frag_size);
2393
2394                 /* Add this to skb_queue */
2395                 skb_queue_tail(&dev->fragment_skb, frag);
2396
2397         } while (skb->len > 0);
2398
2399         dev_kfree_skb(skb);
2400
2401         return skb_queue_len(&dev->fragment_skb);
2402 }
2403
2404 static int pn533_transceive(struct nfc_dev *nfc_dev,
2405                             struct nfc_target *target, struct sk_buff *skb,
2406                             data_exchange_cb_t cb, void *cb_context)
2407 {
2408         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2409         struct pn533_data_exchange_arg *arg = NULL;
2410         int rc;
2411
2412         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2413
2414         if (!dev->tgt_active_prot) {
2415                 nfc_dev_err(&dev->interface->dev,
2416                             "Can't exchange data if there is no active target");
2417                 rc = -EINVAL;
2418                 goto error;
2419         }
2420
2421         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2422         if (!arg) {
2423                 rc = -ENOMEM;
2424                 goto error;
2425         }
2426
2427         arg->cb = cb;
2428         arg->cb_context = cb_context;
2429
2430         switch (dev->device_type) {
2431         case PN533_DEVICE_PASORI:
2432                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2433                         rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2434                                                    skb,
2435                                                    pn533_data_exchange_complete,
2436                                                    arg);
2437
2438                         break;
2439                 }
2440         default:
2441                 /* jumbo frame ? */
2442                 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2443                         rc = pn533_fill_fragment_skbs(dev, skb);
2444                         if (rc <= 0)
2445                                 goto error;
2446
2447                         skb = skb_dequeue(&dev->fragment_skb);
2448                         if (!skb) {
2449                                 rc = -EIO;
2450                                 goto error;
2451                         }
2452                 } else {
2453                         *skb_push(skb, sizeof(u8)) =  1; /* TG */
2454                 }
2455
2456                 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2457                                            skb, pn533_data_exchange_complete,
2458                                            arg);
2459
2460                 break;
2461         }
2462
2463         if (rc < 0) /* rc from send_async */
2464                 goto error;
2465
2466         return 0;
2467
2468 error:
2469         kfree(arg);
2470         dev_kfree_skb(skb);
2471         return rc;
2472 }
2473
2474 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2475                                   struct sk_buff *resp)
2476 {
2477         u8 status;
2478
2479         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2480
2481         if (IS_ERR(resp))
2482                 return PTR_ERR(resp);
2483
2484         status = resp->data[0];
2485
2486         dev_kfree_skb(resp);
2487
2488         if (status != 0) {
2489                 nfc_tm_deactivated(dev->nfc_dev);
2490
2491                 dev->tgt_mode = 0;
2492
2493                 return 0;
2494         }
2495
2496         queue_work(dev->wq, &dev->tg_work);
2497
2498         return 0;
2499 }
2500
2501 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2502 {
2503         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2504         int rc;
2505
2506         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2507
2508         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2509                 nfc_dev_err(&dev->interface->dev,
2510                             "Data length greater than the max allowed: %d",
2511                             PN533_CMD_DATAEXCH_DATA_MAXLEN);
2512                 return -ENOSYS;
2513         }
2514
2515         rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2516                                    pn533_tm_send_complete, NULL);
2517         if (rc < 0)
2518                 dev_kfree_skb(skb);
2519
2520         return rc;
2521 }
2522
2523 static void pn533_wq_mi_recv(struct work_struct *work)
2524 {
2525         struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2526         struct sk_buff *skb;
2527         int rc;
2528
2529         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2530
2531         skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2532         if (!skb)
2533                 goto error;
2534
2535         switch (dev->device_type) {
2536         case PN533_DEVICE_PASORI:
2537                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2538                         rc = pn533_send_cmd_direct_async(dev,
2539                                                 PN533_CMD_IN_COMM_THRU,
2540                                                 skb,
2541                                                 pn533_data_exchange_complete,
2542                                                  dev->cmd_complete_mi_arg);
2543
2544                         break;
2545                 }
2546         default:
2547                 *skb_put(skb, sizeof(u8)) =  1; /*TG*/
2548
2549                 rc = pn533_send_cmd_direct_async(dev,
2550                                                  PN533_CMD_IN_DATA_EXCHANGE,
2551                                                  skb,
2552                                                  pn533_data_exchange_complete,
2553                                                  dev->cmd_complete_mi_arg);
2554
2555                 break;
2556         }
2557
2558         if (rc == 0) /* success */
2559                 return;
2560
2561         nfc_dev_err(&dev->interface->dev,
2562                     "Error %d when trying to perform data_exchange", rc);
2563
2564         dev_kfree_skb(skb);
2565         kfree(dev->cmd_complete_mi_arg);
2566
2567 error:
2568         pn533_send_ack(dev, GFP_KERNEL);
2569         queue_work(dev->wq, &dev->cmd_work);
2570 }
2571
2572 static void pn533_wq_mi_send(struct work_struct *work)
2573 {
2574         struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2575         struct sk_buff *skb;
2576         int rc;
2577
2578         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2579
2580         /* Grab the first skb in the queue */
2581         skb = skb_dequeue(&dev->fragment_skb);
2582
2583         if (skb == NULL) {      /* No more data */
2584                 /* Reset the queue for future use */
2585                 skb_queue_head_init(&dev->fragment_skb);
2586                 goto error;
2587         }
2588
2589         switch (dev->device_type) {
2590         case PN533_DEVICE_PASORI:
2591                 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2592                         rc = -EIO;
2593                         break;
2594                 }
2595
2596                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2597                                                  skb,
2598                                                  pn533_data_exchange_complete,
2599                                                  dev->cmd_complete_dep_arg);
2600
2601                 break;
2602
2603         default:
2604                 /* Still some fragments? */
2605                 rc = pn533_send_cmd_direct_async(dev,PN533_CMD_IN_DATA_EXCHANGE,
2606                                                  skb,
2607                                                  pn533_data_exchange_complete,
2608                                                  dev->cmd_complete_dep_arg);
2609
2610                 break;
2611         }
2612
2613         if (rc == 0) /* success */
2614                 return;
2615
2616         nfc_dev_err(&dev->interface->dev,
2617                     "Error %d when trying to perform data_exchange", rc);
2618
2619         dev_kfree_skb(skb);
2620         kfree(dev->cmd_complete_dep_arg);
2621
2622 error:
2623         pn533_send_ack(dev, GFP_KERNEL);
2624         queue_work(dev->wq, &dev->cmd_work);
2625 }
2626
2627 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2628                                                                 u8 cfgdata_len)
2629 {
2630         struct sk_buff *skb;
2631         struct sk_buff *resp;
2632         int skb_len;
2633
2634         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2635
2636         skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2637
2638         skb = pn533_alloc_skb(dev, skb_len);
2639         if (!skb)
2640                 return -ENOMEM;
2641
2642         *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2643         memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2644
2645         resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2646         if (IS_ERR(resp))
2647                 return PTR_ERR(resp);
2648
2649         dev_kfree_skb(resp);
2650         return 0;
2651 }
2652
2653 static int pn533_get_firmware_version(struct pn533 *dev,
2654                                       struct pn533_fw_version *fv)
2655 {
2656         struct sk_buff *skb;
2657         struct sk_buff *resp;
2658
2659         skb = pn533_alloc_skb(dev, 0);
2660         if (!skb)
2661                 return -ENOMEM;
2662
2663         resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2664         if (IS_ERR(resp))
2665                 return PTR_ERR(resp);
2666
2667         fv->ic = resp->data[0];
2668         fv->ver = resp->data[1];
2669         fv->rev = resp->data[2];
2670         fv->support = resp->data[3];
2671
2672         dev_kfree_skb(resp);
2673         return 0;
2674 }
2675
2676 static int pn533_pasori_fw_reset(struct pn533 *dev)
2677 {
2678         struct sk_buff *skb;
2679         struct sk_buff *resp;
2680
2681         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2682
2683         skb = pn533_alloc_skb(dev, sizeof(u8));
2684         if (!skb)
2685                 return -ENOMEM;
2686
2687         *skb_put(skb, sizeof(u8)) = 0x1;
2688
2689         resp = pn533_send_cmd_sync(dev, 0x18, skb);
2690         if (IS_ERR(resp))
2691                 return PTR_ERR(resp);
2692
2693         dev_kfree_skb(resp);
2694
2695         return 0;
2696 }
2697
2698 struct pn533_acr122_poweron_rdr_arg {
2699         int rc;
2700         struct completion done;
2701 };
2702
2703 static void pn533_acr122_poweron_rdr_resp(struct urb *urb)
2704 {
2705         struct pn533_acr122_poweron_rdr_arg *arg = urb->context;
2706
2707         dev_dbg(&urb->dev->dev, "%s\n", __func__);
2708
2709         print_hex_dump_debug("ACR122 RX: ", DUMP_PREFIX_NONE, 16, 1,
2710                        urb->transfer_buffer, urb->transfer_buffer_length,
2711                        false);
2712
2713         arg->rc = urb->status;
2714         complete(&arg->done);
2715 }
2716
2717 static int pn533_acr122_poweron_rdr(struct pn533 *dev)
2718 {
2719         /* Power on th reader (CCID cmd) */
2720         u8 cmd[10] = {PN533_ACR122_PC_TO_RDR_ICCPOWERON,
2721                       0, 0, 0, 0, 0, 0, 3, 0, 0};
2722         u8 buf[255];
2723         int rc;
2724         void *cntx;
2725         struct pn533_acr122_poweron_rdr_arg arg;
2726
2727         dev_dbg(&dev->interface->dev, "%s\n", __func__);
2728
2729         init_completion(&arg.done);
2730         cntx = dev->in_urb->context;  /* backup context */
2731
2732         dev->in_urb->transfer_buffer = buf;
2733         dev->in_urb->transfer_buffer_length = 255;
2734         dev->in_urb->complete = pn533_acr122_poweron_rdr_resp;
2735         dev->in_urb->context = &arg;
2736
2737         dev->out_urb->transfer_buffer = cmd;
2738         dev->out_urb->transfer_buffer_length = sizeof(cmd);
2739
2740         print_hex_dump_debug("ACR122 TX: ", DUMP_PREFIX_NONE, 16, 1,
2741                        cmd, sizeof(cmd), false);
2742
2743         rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
2744         if (rc) {
2745                 nfc_dev_err(&dev->interface->dev,
2746                             "Reader power on cmd error %d", rc);
2747                 return rc;
2748         }
2749
2750         rc =  usb_submit_urb(dev->in_urb, GFP_KERNEL);
2751         if (rc) {
2752                 nfc_dev_err(&dev->interface->dev,
2753                             "Can't submit for reader power on cmd response %d",
2754                             rc);
2755                 return rc;
2756         }
2757
2758         wait_for_completion(&arg.done);
2759         dev->in_urb->context = cntx; /* restore context */
2760
2761         return arg.rc;
2762 }
2763
2764 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2765 {
2766         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2767         u8 rf_field = !!rf;
2768         int rc;
2769
2770         rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2771
2772         rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2773                                      (u8 *)&rf_field, 1);
2774         if (rc) {
2775                 nfc_dev_err(&dev->interface->dev,
2776                             "Error on setting RF field");
2777                 return rc;
2778         }
2779
2780         return rc;
2781 }
2782
2783 int pn533_dev_up(struct nfc_dev *nfc_dev)
2784 {
2785         return pn533_rf_field(nfc_dev, 1);
2786 }
2787
2788 int pn533_dev_down(struct nfc_dev *nfc_dev)
2789 {
2790         return pn533_rf_field(nfc_dev, 0);
2791 }
2792
2793 static struct nfc_ops pn533_nfc_ops = {
2794         .dev_up = pn533_dev_up,
2795         .dev_down = pn533_dev_down,
2796         .dep_link_up = pn533_dep_link_up,
2797         .dep_link_down = pn533_dep_link_down,
2798         .start_poll = pn533_start_poll,
2799         .stop_poll = pn533_stop_poll,
2800         .activate_target = pn533_activate_target,
2801         .deactivate_target = pn533_deactivate_target,
2802         .im_transceive = pn533_transceive,
2803         .tm_send = pn533_tm_send,
2804 };
2805
2806 static int pn533_setup(struct pn533 *dev)
2807 {
2808         struct pn533_config_max_retries max_retries;
2809         struct pn533_config_timing timing;
2810         u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2811         int rc;
2812
2813         switch (dev->device_type) {
2814         case PN533_DEVICE_STD:
2815         case PN533_DEVICE_PASORI:
2816         case PN533_DEVICE_ACR122U:
2817                 max_retries.mx_rty_atr = 0x2;
2818                 max_retries.mx_rty_psl = 0x1;
2819                 max_retries.mx_rty_passive_act =
2820                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2821
2822                 timing.rfu = PN533_CONFIG_TIMING_102;
2823                 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2824                 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2825
2826                 break;
2827
2828         default:
2829                 nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2830                             dev->device_type);
2831                 return -EINVAL;
2832         }
2833
2834         rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2835                                      (u8 *)&max_retries, sizeof(max_retries));
2836         if (rc) {
2837                 nfc_dev_err(&dev->interface->dev,
2838                             "Error on setting MAX_RETRIES config");
2839                 return rc;
2840         }
2841
2842
2843         rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2844                                      (u8 *)&timing, sizeof(timing));
2845         if (rc) {
2846                 nfc_dev_err(&dev->interface->dev,
2847                             "Error on setting RF timings");
2848                 return rc;
2849         }
2850
2851         switch (dev->device_type) {
2852         case PN533_DEVICE_STD:
2853                 break;
2854
2855         case PN533_DEVICE_PASORI:
2856                 pn533_pasori_fw_reset(dev);
2857
2858                 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2859                                              pasori_cfg, 3);
2860                 if (rc) {
2861                         nfc_dev_err(&dev->interface->dev,
2862                                     "Error while settings PASORI config");
2863                         return rc;
2864                 }
2865
2866                 pn533_pasori_fw_reset(dev);
2867
2868                 break;
2869         }
2870
2871         return 0;
2872 }
2873
2874 static int pn533_probe(struct usb_interface *interface,
2875                         const struct usb_device_id *id)
2876 {
2877         struct pn533_fw_version fw_ver;
2878         struct pn533 *dev;
2879         struct usb_host_interface *iface_desc;
2880         struct usb_endpoint_descriptor *endpoint;
2881         int in_endpoint = 0;
2882         int out_endpoint = 0;
2883         int rc = -ENOMEM;
2884         int i;
2885         u32 protocols;
2886
2887         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2888         if (!dev)
2889                 return -ENOMEM;
2890
2891         dev->udev = usb_get_dev(interface_to_usbdev(interface));
2892         dev->interface = interface;
2893         mutex_init(&dev->cmd_lock);
2894
2895         iface_desc = interface->cur_altsetting;
2896         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
2897                 endpoint = &iface_desc->endpoint[i].desc;
2898
2899                 if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
2900                         in_endpoint = endpoint->bEndpointAddress;
2901
2902                 if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
2903                         out_endpoint = endpoint->bEndpointAddress;
2904         }
2905
2906         if (!in_endpoint || !out_endpoint) {
2907                 nfc_dev_err(&interface->dev,
2908                             "Could not find bulk-in or bulk-out endpoint");
2909                 rc = -ENODEV;
2910                 goto error;
2911         }
2912
2913         dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
2914         dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);
2915
2916         if (!dev->in_urb || !dev->out_urb)
2917                 goto error;
2918
2919         usb_fill_bulk_urb(dev->in_urb, dev->udev,
2920                           usb_rcvbulkpipe(dev->udev, in_endpoint),
2921                           NULL, 0, NULL, dev);
2922         usb_fill_bulk_urb(dev->out_urb, dev->udev,
2923                           usb_sndbulkpipe(dev->udev, out_endpoint),
2924                           NULL, 0, pn533_send_complete, dev);
2925
2926         INIT_WORK(&dev->cmd_work, pn533_wq_cmd);
2927         INIT_WORK(&dev->cmd_complete_work, pn533_wq_cmd_complete);
2928         INIT_WORK(&dev->mi_rx_work, pn533_wq_mi_recv);
2929         INIT_WORK(&dev->mi_tx_work, pn533_wq_mi_send);
2930         INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
2931         INIT_DELAYED_WORK(&dev->poll_work, pn533_wq_poll);
2932         INIT_WORK(&dev->rf_work, pn533_wq_rf);
2933         dev->wq = alloc_ordered_workqueue("pn533", 0);
2934         if (dev->wq == NULL)
2935                 goto error;
2936
2937         init_timer(&dev->listen_timer);
2938         dev->listen_timer.data = (unsigned long) dev;
2939         dev->listen_timer.function = pn533_listen_mode_timer;
2940
2941         skb_queue_head_init(&dev->resp_q);
2942         skb_queue_head_init(&dev->fragment_skb);
2943
2944         INIT_LIST_HEAD(&dev->cmd_queue);
2945
2946         usb_set_intfdata(interface, dev);
2947
2948         dev->ops = &pn533_std_frame_ops;
2949
2950         dev->protocol_type = PN533_PROTO_REQ_ACK_RESP;
2951         dev->device_type = id->driver_info;
2952         switch (dev->device_type) {
2953         case PN533_DEVICE_STD:
2954                 protocols = PN533_ALL_PROTOCOLS;
2955                 break;
2956
2957         case PN533_DEVICE_PASORI:
2958                 protocols = PN533_NO_TYPE_B_PROTOCOLS;
2959                 break;
2960
2961         case PN533_DEVICE_ACR122U:
2962                 protocols = PN533_NO_TYPE_B_PROTOCOLS;
2963                 dev->ops = &pn533_acr122_frame_ops;
2964                 dev->protocol_type = PN533_PROTO_REQ_RESP,
2965
2966                 rc = pn533_acr122_poweron_rdr(dev);
2967                 if (rc < 0) {
2968                         nfc_dev_err(&dev->interface->dev,
2969                                     "Couldn't poweron the reader (error %d)",
2970                                     rc);
2971                         goto destroy_wq;
2972                 }
2973                 break;
2974
2975         default:
2976                 nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
2977                             dev->device_type);
2978                 rc = -EINVAL;
2979                 goto destroy_wq;
2980         }
2981
2982         memset(&fw_ver, 0, sizeof(fw_ver));
2983         rc = pn533_get_firmware_version(dev, &fw_ver);
2984         if (rc < 0)
2985                 goto destroy_wq;
2986
2987         nfc_dev_info(&dev->interface->dev,
2988                      "NXP PN5%02X firmware ver %d.%d now attached",
2989                      fw_ver.ic, fw_ver.ver, fw_ver.rev);
2990
2991
2992         dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2993                                            dev->ops->tx_header_len +
2994                                            PN533_CMD_DATAEXCH_HEAD_LEN,
2995                                            dev->ops->tx_tail_len);
2996         if (!dev->nfc_dev) {
2997                 rc = -ENOMEM;
2998                 goto destroy_wq;
2999         }
3000
3001         nfc_set_parent_dev(dev->nfc_dev, &interface->dev);
3002         nfc_set_drvdata(dev->nfc_dev, dev);
3003
3004         rc = nfc_register_device(dev->nfc_dev);
3005         if (rc)
3006                 goto free_nfc_dev;
3007
3008         rc = pn533_setup(dev);
3009         if (rc)
3010                 goto unregister_nfc_dev;
3011
3012         return 0;
3013
3014 unregister_nfc_dev:
3015         nfc_unregister_device(dev->nfc_dev);
3016
3017 free_nfc_dev:
3018         nfc_free_device(dev->nfc_dev);
3019
3020 destroy_wq:
3021         destroy_workqueue(dev->wq);
3022 error:
3023         usb_free_urb(dev->in_urb);
3024         usb_free_urb(dev->out_urb);
3025         usb_put_dev(dev->udev);
3026         kfree(dev);
3027         return rc;
3028 }
3029
3030 static void pn533_disconnect(struct usb_interface *interface)
3031 {
3032         struct pn533 *dev;
3033         struct pn533_cmd *cmd, *n;
3034
3035         dev = usb_get_intfdata(interface);
3036         usb_set_intfdata(interface, NULL);
3037
3038         nfc_unregister_device(dev->nfc_dev);
3039         nfc_free_device(dev->nfc_dev);
3040
3041         usb_kill_urb(dev->in_urb);
3042         usb_kill_urb(dev->out_urb);
3043
3044         flush_delayed_work(&dev->poll_work);
3045         destroy_workqueue(dev->wq);
3046
3047         skb_queue_purge(&dev->resp_q);
3048
3049         del_timer(&dev->listen_timer);
3050
3051         list_for_each_entry_safe(cmd, n, &dev->cmd_queue, queue) {
3052                 list_del(&cmd->queue);
3053                 kfree(cmd);
3054         }
3055
3056         usb_free_urb(dev->in_urb);
3057         usb_free_urb(dev->out_urb);
3058         kfree(dev);
3059
3060         nfc_dev_info(&interface->dev, "NXP PN533 NFC device disconnected");
3061 }
3062
3063 static struct usb_driver pn533_driver = {
3064         .name =         "pn533",
3065         .probe =        pn533_probe,
3066         .disconnect =   pn533_disconnect,
3067         .id_table =     pn533_table,
3068 };
3069
3070 module_usb_driver(pn533_driver);
3071
3072 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
3073 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
3074 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
3075 MODULE_DESCRIPTION("PN533 usb driver ver " VERSION);
3076 MODULE_VERSION(VERSION);
3077 MODULE_LICENSE("GPL");