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