drivers/nfc/pn533/pn533.c

   1 /*
   2  * Driver for NXP PN533 NFC Chip - core functions
   3  *
   4  * Copyright (C) 2011 Instituto Nokia de Tecnologia
   5  * Copyright (C) 2012-2013 Tieto Poland
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  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/nfc.h>
  26 #include <linux/netdevice.h>
  27 #include <net/nfc/nfc.h>
  28 #include "pn533.h"
  29
  30 #define VERSION "0.3"
  31
  32 /* How much time we spend listening for initiators */
  33 #define PN533_LISTEN_TIME 2
  34 /* Delay between each poll frame (ms) */
  35 #define PN533_POLL_INTERVAL 10
  36
  37 /* structs for pn533 commands */
  38
  39 /* PN533_CMD_GET_FIRMWARE_VERSION */
  40 struct pn533_fw_version {
  41         u8 ic;
  42         u8 ver;
  43         u8 rev;
  44         u8 support;
  45 };
  46
  47 /* PN533_CMD_RF_CONFIGURATION */
  48 #define PN533_CFGITEM_RF_FIELD    0x01
  49 #define PN533_CFGITEM_TIMING      0x02
  50 #define PN533_CFGITEM_MAX_RETRIES 0x05
  51 #define PN533_CFGITEM_PASORI      0x82
  52
  53 #define PN533_CFGITEM_RF_FIELD_AUTO_RFCA 0x2
  54 #define PN533_CFGITEM_RF_FIELD_ON        0x1
  55 #define PN533_CFGITEM_RF_FIELD_OFF       0x0
  56
  57 #define PN533_CONFIG_TIMING_102 0xb
  58 #define PN533_CONFIG_TIMING_204 0xc
  59 #define PN533_CONFIG_TIMING_409 0xd
  60 #define PN533_CONFIG_TIMING_819 0xe
  61
  62 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
  63 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
  64
  65 struct pn533_config_max_retries {
  66         u8 mx_rty_atr;
  67         u8 mx_rty_psl;
  68         u8 mx_rty_passive_act;
  69 } __packed;
  70
  71 struct pn533_config_timing {
  72         u8 rfu;
  73         u8 atr_res_timeout;
  74         u8 dep_timeout;
  75 } __packed;
  76
  77 /* PN533_CMD_IN_LIST_PASSIVE_TARGET */
  78
  79 /* felica commands opcode */
  80 #define PN533_FELICA_OPC_SENSF_REQ 0
  81 #define PN533_FELICA_OPC_SENSF_RES 1
  82 /* felica SENSF_REQ parameters */
  83 #define PN533_FELICA_SENSF_SC_ALL 0xFFFF
  84 #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
  85 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
  86 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
  87
  88 /* type B initiator_data values */
  89 #define PN533_TYPE_B_AFI_ALL_FAMILIES 0
  90 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
  91 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
  92
  93 union pn533_cmd_poll_initdata {
  94         struct {
  95                 u8 afi;
  96                 u8 polling_method;
  97         } __packed type_b;
  98         struct {
  99                 u8 opcode;
 100                 __be16 sc;
 101                 u8 rc;
 102                 u8 tsn;
 103         } __packed felica;
 104 };
 105
 106 struct pn533_poll_modulations {
 107         struct {
 108                 u8 maxtg;
 109                 u8 brty;
 110                 union pn533_cmd_poll_initdata initiator_data;
 111         } __packed data;
 112         u8 len;
 113 };
 114
 115 static const struct pn533_poll_modulations poll_mod[] = {
 116         [PN533_POLL_MOD_106KBPS_A] = {
 117                 .data = {
 118                         .maxtg = 1,
 119                         .brty = 0,
 120                 },
 121                 .len = 2,
 122         },
 123         [PN533_POLL_MOD_212KBPS_FELICA] = {
 124                 .data = {
 125                         .maxtg = 1,
 126                         .brty = 1,
 127                         .initiator_data.felica = {
 128                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
 129                                 .sc = PN533_FELICA_SENSF_SC_ALL,
 130                                 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
 131                                 .tsn = 0x03,
 132                         },
 133                 },
 134                 .len = 7,
 135         },
 136         [PN533_POLL_MOD_424KBPS_FELICA] = {
 137                 .data = {
 138                         .maxtg = 1,
 139                         .brty = 2,
 140                         .initiator_data.felica = {
 141                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
 142                                 .sc = PN533_FELICA_SENSF_SC_ALL,
 143                                 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
 144                                 .tsn = 0x03,
 145                         },
 146                  },
 147                 .len = 7,
 148         },
 149         [PN533_POLL_MOD_106KBPS_JEWEL] = {
 150                 .data = {
 151                         .maxtg = 1,
 152                         .brty = 4,
 153                 },
 154                 .len = 2,
 155         },
 156         [PN533_POLL_MOD_847KBPS_B] = {
 157                 .data = {
 158                         .maxtg = 1,
 159                         .brty = 8,
 160                         .initiator_data.type_b = {
 161                                 .afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
 162                                 .polling_method =
 163                                         PN533_TYPE_B_POLL_METHOD_TIMESLOT,
 164                         },
 165                 },
 166                 .len = 3,
 167         },
 168         [PN533_LISTEN_MOD] = {
 169                 .len = 0,
 170         },
 171 };
 172
 173 /* PN533_CMD_IN_ATR */
 174
 175 struct pn533_cmd_activate_response {
 176         u8 status;
 177         u8 nfcid3t[10];
 178         u8 didt;
 179         u8 bst;
 180         u8 brt;
 181         u8 to;
 182         u8 ppt;
 183         /* optional */
 184         u8 gt[];
 185 } __packed;
 186
 187 struct pn533_cmd_jump_dep_response {
 188         u8 status;
 189         u8 tg;
 190         u8 nfcid3t[10];
 191         u8 didt;
 192         u8 bst;
 193         u8 brt;
 194         u8 to;
 195         u8 ppt;
 196         /* optional */
 197         u8 gt[];
 198 } __packed;
 199
 200
 201 /* PN533_TG_INIT_AS_TARGET */
 202 #define PN533_INIT_TARGET_PASSIVE 0x1
 203 #define PN533_INIT_TARGET_DEP 0x2
 204
 205 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
 206 #define PN533_INIT_TARGET_RESP_ACTIVE     0x1
 207 #define PN533_INIT_TARGET_RESP_DEP        0x4
 208
 209 /* The rule: value(high byte) + value(low byte) + checksum = 0 */
 210 static inline u8 pn533_ext_checksum(u16 value)
 211 {
 212         return ~(u8)(((value & 0xFF00) >> 8) + (u8)(value & 0xFF)) + 1;
 213 }
 214
 215 /* The rule: value + checksum = 0 */
 216 static inline u8 pn533_std_checksum(u8 value)
 217 {
 218         return ~value + 1;
 219 }
 220
 221 /* The rule: sum(data elements) + checksum = 0 */
 222 static u8 pn533_std_data_checksum(u8 *data, int datalen)
 223 {
 224         u8 sum = 0;
 225         int i;
 226
 227         for (i = 0; i < datalen; i++)
 228                 sum += data[i];
 229
 230         return pn533_std_checksum(sum);
 231 }
 232
 233 static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code)
 234 {
 235         struct pn533_std_frame *frame = _frame;
 236
 237         frame->preamble = 0;
 238         frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF);
 239         PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT;
 240         PN533_FRAME_CMD(frame) = cmd_code;
 241         frame->datalen = 2;
 242 }
 243
 244 static void pn533_std_tx_frame_finish(void *_frame)
 245 {
 246         struct pn533_std_frame *frame = _frame;
 247
 248         frame->datalen_checksum = pn533_std_checksum(frame->datalen);
 249
 250         PN533_STD_FRAME_CHECKSUM(frame) =
 251                 pn533_std_data_checksum(frame->data, frame->datalen);
 252
 253         PN533_STD_FRAME_POSTAMBLE(frame) = 0;
 254 }
 255
 256 static void pn533_std_tx_update_payload_len(void *_frame, int len)
 257 {
 258         struct pn533_std_frame *frame = _frame;
 259
 260         frame->datalen += len;
 261 }
 262
 263 static bool pn533_std_rx_frame_is_valid(void *_frame, struct pn533 *dev)
 264 {
 265         u8 checksum;
 266         struct pn533_std_frame *stdf = _frame;
 267
 268         if (stdf->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
 269                 return false;
 270
 271         if (likely(!PN533_STD_IS_EXTENDED(stdf))) {
 272                 /* Standard frame code */
 273                 dev->ops->rx_header_len = PN533_STD_FRAME_HEADER_LEN;
 274
 275                 checksum = pn533_std_checksum(stdf->datalen);
 276                 if (checksum != stdf->datalen_checksum)
 277                         return false;
 278
 279                 checksum = pn533_std_data_checksum(stdf->data, stdf->datalen);
 280                 if (checksum != PN533_STD_FRAME_CHECKSUM(stdf))
 281                         return false;
 282         } else {
 283                 /* Extended */
 284                 struct pn533_ext_frame *eif = _frame;
 285
 286                 dev->ops->rx_header_len = PN533_EXT_FRAME_HEADER_LEN;
 287
 288                 checksum = pn533_ext_checksum(be16_to_cpu(eif->datalen));
 289                 if (checksum != eif->datalen_checksum)
 290                         return false;
 291
 292                 /* check data checksum */
 293                 checksum = pn533_std_data_checksum(eif->data,
 294                                                    be16_to_cpu(eif->datalen));
 295                 if (checksum != PN533_EXT_FRAME_CHECKSUM(eif))
 296                         return false;
 297         }
 298
 299         return true;
 300 }
 301
 302 bool pn533_rx_frame_is_ack(void *_frame)
 303 {
 304         struct pn533_std_frame *frame = _frame;
 305
 306         if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
 307                 return false;
 308
 309         if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
 310                 return false;
 311
 312         return true;
 313 }
 314 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_ack);
 315
 316 static inline int pn533_std_rx_frame_size(void *frame)
 317 {
 318         struct pn533_std_frame *f = frame;
 319
 320         /* check for Extended Information frame */
 321         if (PN533_STD_IS_EXTENDED(f)) {
 322                 struct pn533_ext_frame *eif = frame;
 323
 324                 return sizeof(struct pn533_ext_frame)
 325                         + be16_to_cpu(eif->datalen) + PN533_STD_FRAME_TAIL_LEN;
 326         }
 327
 328         return sizeof(struct pn533_std_frame) + f->datalen +
 329                PN533_STD_FRAME_TAIL_LEN;
 330 }
 331
 332 static u8 pn533_std_get_cmd_code(void *frame)
 333 {
 334         struct pn533_std_frame *f = frame;
 335         struct pn533_ext_frame *eif = frame;
 336
 337         if (PN533_STD_IS_EXTENDED(f))
 338                 return PN533_FRAME_CMD(eif);
 339         else
 340                 return PN533_FRAME_CMD(f);
 341 }
 342
 343 bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
 344 {
 345         return (dev->ops->get_cmd_code(frame) ==
 346                                 PN533_CMD_RESPONSE(dev->cmd->code));
 347 }
 348 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_cmd_response);
 349
 350
 351 static struct pn533_frame_ops pn533_std_frame_ops = {
 352         .tx_frame_init = pn533_std_tx_frame_init,
 353         .tx_frame_finish = pn533_std_tx_frame_finish,
 354         .tx_update_payload_len = pn533_std_tx_update_payload_len,
 355         .tx_header_len = PN533_STD_FRAME_HEADER_LEN,
 356         .tx_tail_len = PN533_STD_FRAME_TAIL_LEN,
 357
 358         .rx_is_frame_valid = pn533_std_rx_frame_is_valid,
 359         .rx_frame_size = pn533_std_rx_frame_size,
 360         .rx_header_len = PN533_STD_FRAME_HEADER_LEN,
 361         .rx_tail_len = PN533_STD_FRAME_TAIL_LEN,
 362
 363         .max_payload_len =  PN533_STD_FRAME_MAX_PAYLOAD_LEN,
 364         .get_cmd_code = pn533_std_get_cmd_code,
 365 };
 366
 367 static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
 368                                   struct sk_buff *skb)
 369 {
 370         /* payload is already there, just update datalen */
 371         int payload_len = skb->len;
 372         struct pn533_frame_ops *ops = dev->ops;
 373
 374
 375         skb_push(skb, ops->tx_header_len);
 376         skb_put(skb, ops->tx_tail_len);
 377
 378         ops->tx_frame_init(skb->data, cmd_code);
 379         ops->tx_update_payload_len(skb->data, payload_len);
 380         ops->tx_frame_finish(skb->data);
 381 }
 382
 383 static int pn533_send_async_complete(struct pn533 *dev)
 384 {
 385         struct pn533_cmd *cmd = dev->cmd;
 386         int status = cmd->status;
 387
 388         struct sk_buff *req = cmd->req;
 389         struct sk_buff *resp = cmd->resp;
 390
 391         int rc;
 392
 393         dev_kfree_skb(req);
 394
 395         if (status < 0) {
 396                 rc = cmd->complete_cb(dev, cmd->complete_cb_context,
 397                                       ERR_PTR(status));
 398                 dev_kfree_skb(resp);
 399                 goto done;
 400         }
 401
 402         skb_pull(resp, dev->ops->rx_header_len);
 403         skb_trim(resp, resp->len - dev->ops->rx_tail_len);
 404
 405         rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp);
 406
 407 done:
 408         kfree(cmd);
 409         dev->cmd = NULL;
 410         return rc;
 411 }
 412
 413 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
 414                               struct sk_buff *req,
 415                               pn533_send_async_complete_t complete_cb,
 416                               void *complete_cb_context)
 417 {
 418         struct pn533_cmd *cmd;
 419         int rc = 0;
 420
 421         dev_dbg(dev->dev, "Sending command 0x%x\n", cmd_code);
 422
 423         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 424         if (!cmd)
 425                 return -ENOMEM;
 426
 427         cmd->code = cmd_code;
 428         cmd->req = req;
 429         cmd->complete_cb = complete_cb;
 430         cmd->complete_cb_context = complete_cb_context;
 431
 432         pn533_build_cmd_frame(dev, cmd_code, req);
 433
 434         mutex_lock(&dev->cmd_lock);
 435
 436         if (!dev->cmd_pending) {
 437                 rc = dev->phy_ops->send_frame(dev, req);
 438                 if (rc)
 439                         goto error;
 440
 441                 dev->cmd_pending = 1;
 442                 dev->cmd = cmd;
 443                 goto unlock;
 444         }
 445
 446         dev_dbg(dev->dev, "%s Queueing command 0x%x\n",
 447                 __func__, cmd_code);
 448
 449         INIT_LIST_HEAD(&cmd->queue);
 450         list_add_tail(&cmd->queue, &dev->cmd_queue);
 451
 452         goto unlock;
 453
 454 error:
 455         kfree(cmd);
 456 unlock:
 457         mutex_unlock(&dev->cmd_lock);
 458         return rc;
 459 }
 460
 461 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
 462                                  struct sk_buff *req,
 463                                  pn533_send_async_complete_t complete_cb,
 464                                  void *complete_cb_context)
 465 {
 466         int rc;
 467
 468         rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
 469                                 complete_cb_context);
 470
 471         return rc;
 472 }
 473
 474 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
 475                                 struct sk_buff *req,
 476                                 pn533_send_async_complete_t complete_cb,
 477                                 void *complete_cb_context)
 478 {
 479         int rc;
 480
 481         rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
 482                                 complete_cb_context);
 483
 484         return rc;
 485 }
 486
 487 /*
 488  * pn533_send_cmd_direct_async
 489  *
 490  * The function sends a piority cmd directly to the chip omiting the cmd
 491  * queue. It's intended to be used by chaining mechanism of received responses
 492  * where the host has to request every single chunk of data before scheduling
 493  * next cmd from the queue.
 494  */
 495 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
 496                                        struct sk_buff *req,
 497                                        pn533_send_async_complete_t complete_cb,
 498                                        void *complete_cb_context)
 499 {
 500         struct pn533_cmd *cmd;
 501         int rc;
 502
 503         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 504         if (!cmd)
 505                 return -ENOMEM;
 506
 507         cmd->code = cmd_code;
 508         cmd->req = req;
 509         cmd->complete_cb = complete_cb;
 510         cmd->complete_cb_context = complete_cb_context;
 511
 512         pn533_build_cmd_frame(dev, cmd_code, req);
 513
 514         rc = dev->phy_ops->send_frame(dev, req);
 515         if (rc < 0)
 516                 kfree(cmd);
 517         else
 518                 dev->cmd = cmd;
 519
 520         return rc;
 521 }
 522
 523 static void pn533_wq_cmd_complete(struct work_struct *work)
 524 {
 525         struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
 526         int rc;
 527
 528         rc = pn533_send_async_complete(dev);
 529         if (rc != -EINPROGRESS)
 530                 queue_work(dev->wq, &dev->cmd_work);
 531 }
 532
 533 static void pn533_wq_cmd(struct work_struct *work)
 534 {
 535         struct pn533 *dev = container_of(work, struct pn533, cmd_work);
 536         struct pn533_cmd *cmd;
 537         int rc;
 538
 539         mutex_lock(&dev->cmd_lock);
 540
 541         if (list_empty(&dev->cmd_queue)) {
 542                 dev->cmd_pending = 0;
 543                 mutex_unlock(&dev->cmd_lock);
 544                 return;
 545         }
 546
 547         cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
 548
 549         list_del(&cmd->queue);
 550
 551         mutex_unlock(&dev->cmd_lock);
 552
 553         rc = dev->phy_ops->send_frame(dev, cmd->req);
 554         if (rc < 0) {
 555                 dev_kfree_skb(cmd->req);
 556                 kfree(cmd);
 557                 return;
 558         }
 559
 560         dev->cmd = cmd;
 561 }
 562
 563 struct pn533_sync_cmd_response {
 564         struct sk_buff *resp;
 565         struct completion done;
 566 };
 567
 568 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
 569                                     struct sk_buff *resp)
 570 {
 571         struct pn533_sync_cmd_response *arg = _arg;
 572
 573         arg->resp = resp;
 574         complete(&arg->done);
 575
 576         return 0;
 577 }
 578
 579 /*  pn533_send_cmd_sync
 580  *
 581  *  Please note the req parameter is freed inside the function to
 582  *  limit a number of return value interpretations by the caller.
 583  *
 584  *  1. negative in case of error during TX path -> req should be freed
 585  *
 586  *  2. negative in case of error during RX path -> req should not be freed
 587  *     as it's been already freed at the beginning of RX path by
 588  *     async_complete_cb.
 589  *
 590  *  3. valid pointer in case of succesfult RX path
 591  *
 592  *  A caller has to check a return value with IS_ERR macro. If the test pass,
 593  *  the returned pointer is valid.
 594  *
 595  */
 596 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
 597                                                struct sk_buff *req)
 598 {
 599         int rc;
 600         struct pn533_sync_cmd_response arg;
 601
 602         init_completion(&arg.done);
 603
 604         rc = pn533_send_cmd_async(dev, cmd_code, req,
 605                                   pn533_send_sync_complete, &arg);
 606         if (rc) {
 607                 dev_kfree_skb(req);
 608                 return ERR_PTR(rc);
 609         }
 610
 611         wait_for_completion(&arg.done);
 612
 613         return arg.resp;
 614 }
 615
 616 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
 617 {
 618         struct sk_buff *skb;
 619
 620         skb = alloc_skb(dev->ops->tx_header_len +
 621                         size +
 622                         dev->ops->tx_tail_len, GFP_KERNEL);
 623
 624         if (skb)
 625                 skb_reserve(skb, dev->ops->tx_header_len);
 626
 627         return skb;
 628 }
 629
 630 struct pn533_target_type_a {
 631         __be16 sens_res;
 632         u8 sel_res;
 633         u8 nfcid_len;
 634         u8 nfcid_data[];
 635 } __packed;
 636
 637
 638 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
 639 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
 640 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
 641
 642 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
 643 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
 644
 645 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
 646 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
 647
 648 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
 649 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
 650 #define PN533_TYPE_A_SEL_PROT_DEP 2
 651 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
 652
 653 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
 654                                                         int target_data_len)
 655 {
 656         u8 ssd;
 657         u8 platconf;
 658
 659         if (target_data_len < sizeof(struct pn533_target_type_a))
 660                 return false;
 661
 662         /*
 663          * The length check of nfcid[] and ats[] are not being performed because
 664          * the values are not being used
 665          */
 666
 667         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
 668         ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
 669         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
 670
 671         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 672              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
 673             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 674              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
 675                 return false;
 676
 677         /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
 678         if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
 679                 return false;
 680
 681         if (type_a->nfcid_len > NFC_NFCID1_MAXSIZE)
 682                 return false;
 683
 684         return true;
 685 }
 686
 687 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
 688                                                         int tgt_data_len)
 689 {
 690         struct pn533_target_type_a *tgt_type_a;
 691
 692         tgt_type_a = (struct pn533_target_type_a *)tgt_data;
 693
 694         if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
 695                 return -EPROTO;
 696
 697         switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
 698         case PN533_TYPE_A_SEL_PROT_MIFARE:
 699                 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
 700                 break;
 701         case PN533_TYPE_A_SEL_PROT_ISO14443:
 702                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
 703                 break;
 704         case PN533_TYPE_A_SEL_PROT_DEP:
 705                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 706                 break;
 707         case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
 708                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
 709                                                         NFC_PROTO_NFC_DEP_MASK;
 710                 break;
 711         }
 712
 713         nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
 714         nfc_tgt->sel_res = tgt_type_a->sel_res;
 715         nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
 716         memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
 717
 718         return 0;
 719 }
 720
 721 struct pn533_target_felica {
 722         u8 pol_res;
 723         u8 opcode;
 724         u8 nfcid2[NFC_NFCID2_MAXSIZE];
 725         u8 pad[8];
 726         /* optional */
 727         u8 syst_code[];
 728 } __packed;
 729
 730 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
 731 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
 732
 733 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
 734                                                         int target_data_len)
 735 {
 736         if (target_data_len < sizeof(struct pn533_target_felica))
 737                 return false;
 738
 739         if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
 740                 return false;
 741
 742         return true;
 743 }
 744
 745 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
 746                                                         int tgt_data_len)
 747 {
 748         struct pn533_target_felica *tgt_felica;
 749
 750         tgt_felica = (struct pn533_target_felica *)tgt_data;
 751
 752         if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
 753                 return -EPROTO;
 754
 755         if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
 756             (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
 757                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 758         else
 759                 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
 760
 761         memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
 762         nfc_tgt->sensf_res_len = 9;
 763
 764         memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
 765         nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
 766
 767         return 0;
 768 }
 769
 770 struct pn533_target_jewel {
 771         __be16 sens_res;
 772         u8 jewelid[4];
 773 } __packed;
 774
 775 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
 776                                                         int target_data_len)
 777 {
 778         u8 ssd;
 779         u8 platconf;
 780
 781         if (target_data_len < sizeof(struct pn533_target_jewel))
 782                 return false;
 783
 784         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
 785         ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
 786         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
 787
 788         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 789              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
 790             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 791              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
 792                 return false;
 793
 794         return true;
 795 }
 796
 797 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
 798                                                         int tgt_data_len)
 799 {
 800         struct pn533_target_jewel *tgt_jewel;
 801
 802         tgt_jewel = (struct pn533_target_jewel *)tgt_data;
 803
 804         if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
 805                 return -EPROTO;
 806
 807         nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
 808         nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
 809         nfc_tgt->nfcid1_len = 4;
 810         memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
 811
 812         return 0;
 813 }
 814
 815 struct pn533_type_b_prot_info {
 816         u8 bitrate;
 817         u8 fsci_type;
 818         u8 fwi_adc_fo;
 819 } __packed;
 820
 821 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
 822 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
 823 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
 824
 825 struct pn533_type_b_sens_res {
 826         u8 opcode;
 827         u8 nfcid[4];
 828         u8 appdata[4];
 829         struct pn533_type_b_prot_info prot_info;
 830 } __packed;
 831
 832 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
 833
 834 struct pn533_target_type_b {
 835         struct pn533_type_b_sens_res sensb_res;
 836         u8 attrib_res_len;
 837         u8 attrib_res[];
 838 } __packed;
 839
 840 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
 841                                                         int target_data_len)
 842 {
 843         if (target_data_len < sizeof(struct pn533_target_type_b))
 844                 return false;
 845
 846         if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
 847                 return false;
 848
 849         if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
 850                                                 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
 851                 return false;
 852
 853         return true;
 854 }
 855
 856 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
 857                                                         int tgt_data_len)
 858 {
 859         struct pn533_target_type_b *tgt_type_b;
 860
 861         tgt_type_b = (struct pn533_target_type_b *)tgt_data;
 862
 863         if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
 864                 return -EPROTO;
 865
 866         nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
 867
 868         return 0;
 869 }
 870
 871 static void pn533_poll_reset_mod_list(struct pn533 *dev);
 872 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
 873                               int tgdata_len)
 874 {
 875         struct nfc_target nfc_tgt;
 876         int rc;
 877
 878         dev_dbg(dev->dev, "%s: modulation=%d\n",
 879                 __func__, dev->poll_mod_curr);
 880
 881         if (tg != 1)
 882                 return -EPROTO;
 883
 884         memset(&nfc_tgt, 0, sizeof(struct nfc_target));
 885
 886         switch (dev->poll_mod_curr) {
 887         case PN533_POLL_MOD_106KBPS_A:
 888                 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
 889                 break;
 890         case PN533_POLL_MOD_212KBPS_FELICA:
 891         case PN533_POLL_MOD_424KBPS_FELICA:
 892                 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
 893                 break;
 894         case PN533_POLL_MOD_106KBPS_JEWEL:
 895                 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
 896                 break;
 897         case PN533_POLL_MOD_847KBPS_B:
 898                 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
 899                 break;
 900         default:
 901                 nfc_err(dev->dev,
 902                         "Unknown current poll modulation\n");
 903                 return -EPROTO;
 904         }
 905
 906         if (rc)
 907                 return rc;
 908
 909         if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
 910                 dev_dbg(dev->dev,
 911                         "The Tg found doesn't have the desired protocol\n");
 912                 return -EAGAIN;
 913         }
 914
 915         dev_dbg(dev->dev,
 916                 "Target found - supported protocols: 0x%x\n",
 917                 nfc_tgt.supported_protocols);
 918
 919         dev->tgt_available_prots = nfc_tgt.supported_protocols;
 920
 921         pn533_poll_reset_mod_list(dev);
 922         nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
 923
 924         return 0;
 925 }
 926
 927 static inline void pn533_poll_next_mod(struct pn533 *dev)
 928 {
 929         dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
 930 }
 931
 932 static void pn533_poll_reset_mod_list(struct pn533 *dev)
 933 {
 934         dev->poll_mod_count = 0;
 935 }
 936
 937 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
 938 {
 939         dev->poll_mod_active[dev->poll_mod_count] =
 940                 (struct pn533_poll_modulations *)&poll_mod[mod_index];
 941         dev->poll_mod_count++;
 942 }
 943
 944 static void pn533_poll_create_mod_list(struct pn533 *dev,
 945                                        u32 im_protocols, u32 tm_protocols)
 946 {
 947         pn533_poll_reset_mod_list(dev);
 948
 949         if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
 950             (im_protocols & NFC_PROTO_ISO14443_MASK) ||
 951             (im_protocols & NFC_PROTO_NFC_DEP_MASK))
 952                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
 953
 954         if (im_protocols & NFC_PROTO_FELICA_MASK ||
 955             im_protocols & NFC_PROTO_NFC_DEP_MASK) {
 956                 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
 957                 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
 958         }
 959
 960         if (im_protocols & NFC_PROTO_JEWEL_MASK)
 961                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
 962
 963         if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
 964                 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
 965
 966         if (tm_protocols)
 967                 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
 968 }
 969
 970 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
 971 {
 972         u8 nbtg, tg, *tgdata;
 973         int rc, tgdata_len;
 974
 975         /* Toggle the DEP polling */
 976         if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK)
 977                 dev->poll_dep = 1;
 978
 979         nbtg = resp->data[0];
 980         tg = resp->data[1];
 981         tgdata = &resp->data[2];
 982         tgdata_len = resp->len - 2;  /* nbtg + tg */
 983
 984         if (nbtg) {
 985                 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
 986
 987                 /* We must stop the poll after a valid target found */
 988                 if (rc == 0)
 989                         return 0;
 990         }
 991
 992         return -EAGAIN;
 993 }
 994
 995 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
 996 {
 997         struct sk_buff *skb;
 998         u8 *felica, *nfcid3, *gb;
 999
1000         u8 *gbytes = dev->gb;
1001         size_t gbytes_len = dev->gb_len;
1002
1003         u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1004                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1005                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1006                                 0xff, 0xff}; /* System code */
1007
1008         u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1009                                0x0, 0x0, 0x0,
1010                                0x40}; /* SEL_RES for DEP */
1011
1012         unsigned int skb_len = 36 + /*
1013                                      * mode (1), mifare (6),
1014                                      * felica (18), nfcid3 (10), gb_len (1)
1015                                      */
1016                                gbytes_len +
1017                                1;  /* len Tk*/
1018
1019         skb = pn533_alloc_skb(dev, skb_len);
1020         if (!skb)
1021                 return NULL;
1022
1023         /* DEP support only */
1024         *skb_put(skb, 1) = PN533_INIT_TARGET_DEP;
1025
1026         /* MIFARE params */
1027         memcpy(skb_put(skb, 6), mifare_params, 6);
1028
1029         /* Felica params */
1030         felica = skb_put(skb, 18);
1031         memcpy(felica, felica_params, 18);
1032         get_random_bytes(felica + 2, 6);
1033
1034         /* NFCID3 */
1035         nfcid3 = skb_put(skb, 10);
1036         memset(nfcid3, 0, 10);
1037         memcpy(nfcid3, felica, 8);
1038
1039         /* General bytes */
1040         *skb_put(skb, 1) = gbytes_len;
1041
1042         gb = skb_put(skb, gbytes_len);
1043         memcpy(gb, gbytes, gbytes_len);
1044
1045         /* Len Tk */
1046         *skb_put(skb, 1) = 0;
1047
1048         return skb;
1049 }
1050
1051 static void pn533_wq_tm_mi_recv(struct work_struct *work);
1052 static struct sk_buff *pn533_build_response(struct pn533 *dev);
1053
1054 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1055                                       struct sk_buff *resp)
1056 {
1057         struct sk_buff *skb;
1058         u8 status, ret, mi;
1059         int rc;
1060
1061         dev_dbg(dev->dev, "%s\n", __func__);
1062
1063         if (IS_ERR(resp)) {
1064                 skb_queue_purge(&dev->resp_q);
1065                 return PTR_ERR(resp);
1066         }
1067
1068         status = resp->data[0];
1069
1070         ret = status & PN533_CMD_RET_MASK;
1071         mi = status & PN533_CMD_MI_MASK;
1072
1073         skb_pull(resp, sizeof(status));
1074
1075         if (ret != PN533_CMD_RET_SUCCESS) {
1076                 rc = -EIO;
1077                 goto error;
1078         }
1079
1080         skb_queue_tail(&dev->resp_q, resp);
1081
1082         if (mi) {
1083                 queue_work(dev->wq, &dev->mi_tm_rx_work);
1084                 return -EINPROGRESS;
1085         }
1086
1087         skb = pn533_build_response(dev);
1088         if (!skb) {
1089                 rc = -EIO;
1090                 goto error;
1091         }
1092
1093         return nfc_tm_data_received(dev->nfc_dev, skb);
1094
1095 error:
1096         nfc_tm_deactivated(dev->nfc_dev);
1097         dev->tgt_mode = 0;
1098         skb_queue_purge(&dev->resp_q);
1099         dev_kfree_skb(resp);
1100
1101         return rc;
1102 }
1103
1104 static void pn533_wq_tm_mi_recv(struct work_struct *work)
1105 {
1106         struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work);
1107         struct sk_buff *skb;
1108         int rc;
1109
1110         dev_dbg(dev->dev, "%s\n", __func__);
1111
1112         skb = pn533_alloc_skb(dev, 0);
1113         if (!skb)
1114                 return;
1115
1116         rc = pn533_send_cmd_direct_async(dev,
1117                                         PN533_CMD_TG_GET_DATA,
1118                                         skb,
1119                                         pn533_tm_get_data_complete,
1120                                         NULL);
1121
1122         if (rc < 0)
1123                 dev_kfree_skb(skb);
1124 }
1125
1126 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
1127                                   struct sk_buff *resp);
1128 static void pn533_wq_tm_mi_send(struct work_struct *work)
1129 {
1130         struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
1131         struct sk_buff *skb;
1132         int rc;
1133
1134         dev_dbg(dev->dev, "%s\n", __func__);
1135
1136         /* Grab the first skb in the queue */
1137         skb = skb_dequeue(&dev->fragment_skb);
1138         if (skb == NULL) {      /* No more data */
1139                 /* Reset the queue for future use */
1140                 skb_queue_head_init(&dev->fragment_skb);
1141                 goto error;
1142         }
1143
1144         /* last entry - remove MI bit */
1145         if (skb_queue_len(&dev->fragment_skb) == 0) {
1146                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
1147                                         skb, pn533_tm_send_complete, NULL);
1148         } else
1149                 rc = pn533_send_cmd_direct_async(dev,
1150                                         PN533_CMD_TG_SET_META_DATA,
1151                                         skb, pn533_tm_send_complete, NULL);
1152
1153         if (rc == 0) /* success */
1154                 return;
1155
1156         dev_err(dev->dev,
1157                 "Error %d when trying to perform set meta data_exchange", rc);
1158
1159         dev_kfree_skb(skb);
1160
1161 error:
1162         dev->phy_ops->send_ack(dev, GFP_KERNEL);
1163         queue_work(dev->wq, &dev->cmd_work);
1164 }
1165
1166 static void pn533_wq_tg_get_data(struct work_struct *work)
1167 {
1168         struct pn533 *dev = container_of(work, struct pn533, tg_work);
1169         struct sk_buff *skb;
1170         int rc;
1171
1172         dev_dbg(dev->dev, "%s\n", __func__);
1173
1174         skb = pn533_alloc_skb(dev, 0);
1175         if (!skb)
1176                 return;
1177
1178         rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1179                                    pn533_tm_get_data_complete, NULL);
1180
1181         if (rc < 0)
1182                 dev_kfree_skb(skb);
1183 }
1184
1185 #define ATR_REQ_GB_OFFSET 17
1186 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1187 {
1188         u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1189         size_t gb_len;
1190         int rc;
1191
1192         dev_dbg(dev->dev, "%s\n", __func__);
1193
1194         if (resp->len < ATR_REQ_GB_OFFSET + 1)
1195                 return -EINVAL;
1196
1197         mode = resp->data[0];
1198         cmd = &resp->data[1];
1199
1200         dev_dbg(dev->dev, "Target mode 0x%x len %d\n",
1201                 mode, resp->len);
1202
1203         if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1204             PN533_INIT_TARGET_RESP_ACTIVE)
1205                 comm_mode = NFC_COMM_ACTIVE;
1206
1207         if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0)  /* Only DEP supported */
1208                 return -EOPNOTSUPP;
1209
1210         gb = cmd + ATR_REQ_GB_OFFSET;
1211         gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1212
1213         rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1214                               comm_mode, gb, gb_len);
1215         if (rc < 0) {
1216                 nfc_err(dev->dev,
1217                         "Error when signaling target activation\n");
1218                 return rc;
1219         }
1220
1221         dev->tgt_mode = 1;
1222         queue_work(dev->wq, &dev->tg_work);
1223
1224         return 0;
1225 }
1226
1227 static void pn533_listen_mode_timer(unsigned long data)
1228 {
1229         struct pn533 *dev = (struct pn533 *)data;
1230
1231         dev_dbg(dev->dev, "Listen mode timeout\n");
1232
1233         dev->cancel_listen = 1;
1234
1235         pn533_poll_next_mod(dev);
1236
1237         queue_delayed_work(dev->wq, &dev->poll_work,
1238                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1239 }
1240
1241 static int pn533_rf_complete(struct pn533 *dev, void *arg,
1242                              struct sk_buff *resp)
1243 {
1244         int rc = 0;
1245
1246         dev_dbg(dev->dev, "%s\n", __func__);
1247
1248         if (IS_ERR(resp)) {
1249                 rc = PTR_ERR(resp);
1250
1251                 nfc_err(dev->dev, "RF setting error %d\n", rc);
1252
1253                 return rc;
1254         }
1255
1256         queue_delayed_work(dev->wq, &dev->poll_work,
1257                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1258
1259         dev_kfree_skb(resp);
1260         return rc;
1261 }
1262
1263 static void pn533_wq_rf(struct work_struct *work)
1264 {
1265         struct pn533 *dev = container_of(work, struct pn533, rf_work);
1266         struct sk_buff *skb;
1267         int rc;
1268
1269         dev_dbg(dev->dev, "%s\n", __func__);
1270
1271         skb = pn533_alloc_skb(dev, 2);
1272         if (!skb)
1273                 return;
1274
1275         *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD;
1276         *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
1277
1278         rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1279                                   pn533_rf_complete, NULL);
1280         if (rc < 0) {
1281                 dev_kfree_skb(skb);
1282                 nfc_err(dev->dev, "RF setting error %d\n", rc);
1283         }
1284 }
1285
1286 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg,
1287                                    struct sk_buff *resp)
1288 {
1289         struct pn533_cmd_jump_dep_response *rsp;
1290         struct nfc_target nfc_target;
1291         u8 target_gt_len;
1292         int rc;
1293
1294         if (IS_ERR(resp))
1295                 return PTR_ERR(resp);
1296
1297         memset(&nfc_target, 0, sizeof(struct nfc_target));
1298
1299         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1300
1301         rc = rsp->status & PN533_CMD_RET_MASK;
1302         if (rc != PN533_CMD_RET_SUCCESS) {
1303                 /* Not target found, turn radio off */
1304                 queue_work(dev->wq, &dev->rf_work);
1305
1306                 dev_kfree_skb(resp);
1307                 return 0;
1308         }
1309
1310         dev_dbg(dev->dev, "Creating new target");
1311
1312         nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1313         nfc_target.nfcid1_len = 10;
1314         memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1315         rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1316         if (rc)
1317                 goto error;
1318
1319         dev->tgt_available_prots = 0;
1320         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1321
1322         /* ATR_RES general bytes are located at offset 17 */
1323         target_gt_len = resp->len - 17;
1324         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1325                                           rsp->gt, target_gt_len);
1326         if (!rc) {
1327                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1328                                         dev->nfc_dev->targets[0].idx,
1329                                         0, NFC_RF_INITIATOR);
1330
1331                 if (!rc)
1332                         pn533_poll_reset_mod_list(dev);
1333         }
1334 error:
1335         dev_kfree_skb(resp);
1336         return rc;
1337 }
1338
1339 #define PASSIVE_DATA_LEN 5
1340 static int pn533_poll_dep(struct nfc_dev *nfc_dev)
1341 {
1342         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1343         struct sk_buff *skb;
1344         int rc, skb_len;
1345         u8 *next, nfcid3[NFC_NFCID3_MAXSIZE];
1346         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1347
1348         dev_dbg(dev->dev, "%s", __func__);
1349
1350         if (!dev->gb) {
1351                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1352
1353                 if (!dev->gb || !dev->gb_len) {
1354                         dev->poll_dep = 0;
1355                         queue_work(dev->wq, &dev->rf_work);
1356                 }
1357         }
1358
1359         skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1360         skb_len += PASSIVE_DATA_LEN;
1361
1362         /* NFCID3 */
1363         skb_len += NFC_NFCID3_MAXSIZE;
1364         nfcid3[0] = 0x1;
1365         nfcid3[1] = 0xfe;
1366         get_random_bytes(nfcid3 + 2, 6);
1367
1368         skb = pn533_alloc_skb(dev, skb_len);
1369         if (!skb)
1370                 return -ENOMEM;
1371
1372         *skb_put(skb, 1) = 0x01;  /* Active */
1373         *skb_put(skb, 1) = 0x02;  /* 424 kbps */
1374
1375         next = skb_put(skb, 1);  /* Next */
1376         *next = 0;
1377
1378         /* Copy passive data */
1379         memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
1380         *next |= 1;
1381
1382         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1383         memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
1384                NFC_NFCID3_MAXSIZE);
1385         *next |= 2;
1386
1387         memcpy(skb_put(skb, dev->gb_len), dev->gb, dev->gb_len);
1388         *next |= 4; /* We have some Gi */
1389
1390         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1391                                   pn533_poll_dep_complete, NULL);
1392
1393         if (rc < 0)
1394                 dev_kfree_skb(skb);
1395
1396         return rc;
1397 }
1398
1399 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1400                                struct sk_buff *resp)
1401 {
1402         struct pn533_poll_modulations *cur_mod;
1403         int rc;
1404
1405         dev_dbg(dev->dev, "%s\n", __func__);
1406
1407         if (IS_ERR(resp)) {
1408                 rc = PTR_ERR(resp);
1409
1410                 nfc_err(dev->dev, "%s  Poll complete error %d\n",
1411                         __func__, rc);
1412
1413                 if (rc == -ENOENT) {
1414                         if (dev->poll_mod_count != 0)
1415                                 return rc;
1416                         goto stop_poll;
1417                 } else if (rc < 0) {
1418                         nfc_err(dev->dev,
1419                                 "Error %d when running poll\n", rc);
1420                         goto stop_poll;
1421                 }
1422         }
1423
1424         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1425
1426         if (cur_mod->len == 0) { /* Target mode */
1427                 del_timer(&dev->listen_timer);
1428                 rc = pn533_init_target_complete(dev, resp);
1429                 goto done;
1430         }
1431
1432         /* Initiator mode */
1433         rc = pn533_start_poll_complete(dev, resp);
1434         if (!rc)
1435                 goto done;
1436
1437         if (!dev->poll_mod_count) {
1438                 dev_dbg(dev->dev, "Polling has been stopped\n");
1439                 goto done;
1440         }
1441
1442         pn533_poll_next_mod(dev);
1443         /* Not target found, turn radio off */
1444         queue_work(dev->wq, &dev->rf_work);
1445
1446 done:
1447         dev_kfree_skb(resp);
1448         return rc;
1449
1450 stop_poll:
1451         nfc_err(dev->dev, "Polling operation has been stopped\n");
1452
1453         pn533_poll_reset_mod_list(dev);
1454         dev->poll_protocols = 0;
1455         return rc;
1456 }
1457
1458 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1459                                         struct pn533_poll_modulations *mod)
1460 {
1461         struct sk_buff *skb;
1462
1463         skb = pn533_alloc_skb(dev, mod->len);
1464         if (!skb)
1465                 return NULL;
1466
1467         memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
1468
1469         return skb;
1470 }
1471
1472 static int pn533_send_poll_frame(struct pn533 *dev)
1473 {
1474         struct pn533_poll_modulations *mod;
1475         struct sk_buff *skb;
1476         int rc;
1477         u8 cmd_code;
1478
1479         mod = dev->poll_mod_active[dev->poll_mod_curr];
1480
1481         dev_dbg(dev->dev, "%s mod len %d\n",
1482                 __func__, mod->len);
1483
1484         if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep)  {
1485                 dev->poll_dep = 0;
1486                 return pn533_poll_dep(dev->nfc_dev);
1487         }
1488
1489         if (mod->len == 0) {  /* Listen mode */
1490                 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1491                 skb = pn533_alloc_poll_tg_frame(dev);
1492         } else {  /* Polling mode */
1493                 cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
1494                 skb = pn533_alloc_poll_in_frame(dev, mod);
1495         }
1496
1497         if (!skb) {
1498                 nfc_err(dev->dev, "Failed to allocate skb\n");
1499                 return -ENOMEM;
1500         }
1501
1502         rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1503                                   NULL);
1504         if (rc < 0) {
1505                 dev_kfree_skb(skb);
1506                 nfc_err(dev->dev, "Polling loop error %d\n", rc);
1507         }
1508
1509         return rc;
1510 }
1511
1512 static void pn533_wq_poll(struct work_struct *work)
1513 {
1514         struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1515         struct pn533_poll_modulations *cur_mod;
1516         int rc;
1517
1518         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1519
1520         dev_dbg(dev->dev,
1521                 "%s cancel_listen %d modulation len %d\n",
1522                 __func__, dev->cancel_listen, cur_mod->len);
1523
1524         if (dev->cancel_listen == 1) {
1525                 dev->cancel_listen = 0;
1526                 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC);
1527         }
1528
1529         rc = pn533_send_poll_frame(dev);
1530         if (rc)
1531                 return;
1532
1533         if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1534                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1535 }
1536
1537 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1538                             u32 im_protocols, u32 tm_protocols)
1539 {
1540         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1541         struct pn533_poll_modulations *cur_mod;
1542         u8 rand_mod;
1543         int rc;
1544
1545         dev_dbg(dev->dev,
1546                 "%s: im protocols 0x%x tm protocols 0x%x\n",
1547                 __func__, im_protocols, tm_protocols);
1548
1549         if (dev->tgt_active_prot) {
1550                 nfc_err(dev->dev,
1551                         "Cannot poll with a target already activated\n");
1552                 return -EBUSY;
1553         }
1554
1555         if (dev->tgt_mode) {
1556                 nfc_err(dev->dev,
1557                         "Cannot poll while already being activated\n");
1558                 return -EBUSY;
1559         }
1560
1561         if (tm_protocols) {
1562                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1563                 if (dev->gb == NULL)
1564                         tm_protocols = 0;
1565         }
1566
1567         pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1568         dev->poll_protocols = im_protocols;
1569         dev->listen_protocols = tm_protocols;
1570
1571         /* Do not always start polling from the same modulation */
1572         get_random_bytes(&rand_mod, sizeof(rand_mod));
1573         rand_mod %= dev->poll_mod_count;
1574         dev->poll_mod_curr = rand_mod;
1575
1576         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1577
1578         rc = pn533_send_poll_frame(dev);
1579
1580         /* Start listen timer */
1581         if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
1582                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1583
1584         return rc;
1585 }
1586
1587 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1588 {
1589         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1590
1591         del_timer(&dev->listen_timer);
1592
1593         if (!dev->poll_mod_count) {
1594                 dev_dbg(dev->dev,
1595                         "Polling operation was not running\n");
1596                 return;
1597         }
1598
1599         dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1600         flush_delayed_work(&dev->poll_work);
1601         pn533_poll_reset_mod_list(dev);
1602 }
1603
1604 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1605 {
1606         struct pn533_cmd_activate_response *rsp;
1607         u16 gt_len;
1608         int rc;
1609         struct sk_buff *skb;
1610         struct sk_buff *resp;
1611
1612         dev_dbg(dev->dev, "%s\n", __func__);
1613
1614         skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1615         if (!skb)
1616                 return -ENOMEM;
1617
1618         *skb_put(skb, sizeof(u8)) = 1; /* TG */
1619         *skb_put(skb, sizeof(u8)) = 0; /* Next */
1620
1621         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1622         if (IS_ERR(resp))
1623                 return PTR_ERR(resp);
1624
1625         rsp = (struct pn533_cmd_activate_response *)resp->data;
1626         rc = rsp->status & PN533_CMD_RET_MASK;
1627         if (rc != PN533_CMD_RET_SUCCESS) {
1628                 nfc_err(dev->dev,
1629                         "Target activation failed (error 0x%x)\n", rc);
1630                 dev_kfree_skb(resp);
1631                 return -EIO;
1632         }
1633
1634         /* ATR_RES general bytes are located at offset 16 */
1635         gt_len = resp->len - 16;
1636         rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1637
1638         dev_kfree_skb(resp);
1639         return rc;
1640 }
1641
1642 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1643                                  struct nfc_target *target, u32 protocol)
1644 {
1645         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1646         int rc;
1647
1648         dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol);
1649
1650         if (dev->poll_mod_count) {
1651                 nfc_err(dev->dev,
1652                         "Cannot activate while polling\n");
1653                 return -EBUSY;
1654         }
1655
1656         if (dev->tgt_active_prot) {
1657                 nfc_err(dev->dev,
1658                         "There is already an active target\n");
1659                 return -EBUSY;
1660         }
1661
1662         if (!dev->tgt_available_prots) {
1663                 nfc_err(dev->dev,
1664                         "There is no available target to activate\n");
1665                 return -EINVAL;
1666         }
1667
1668         if (!(dev->tgt_available_prots & (1 << protocol))) {
1669                 nfc_err(dev->dev,
1670                         "Target doesn't support requested proto %u\n",
1671                         protocol);
1672                 return -EINVAL;
1673         }
1674
1675         if (protocol == NFC_PROTO_NFC_DEP) {
1676                 rc = pn533_activate_target_nfcdep(dev);
1677                 if (rc) {
1678                         nfc_err(dev->dev,
1679                                 "Activating target with DEP failed %d\n", rc);
1680                         return rc;
1681                 }
1682         }
1683
1684         dev->tgt_active_prot = protocol;
1685         dev->tgt_available_prots = 0;
1686
1687         return 0;
1688 }
1689
1690 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg,
1691                              struct sk_buff *resp)
1692 {
1693         int rc = 0;
1694
1695         dev_dbg(dev->dev, "%s\n", __func__);
1696
1697         if (IS_ERR(resp)) {
1698                 rc = PTR_ERR(resp);
1699
1700                 nfc_err(dev->dev, "Target release error %d\n", rc);
1701
1702                 return rc;
1703         }
1704
1705         rc = resp->data[0] & PN533_CMD_RET_MASK;
1706         if (rc != PN533_CMD_RET_SUCCESS)
1707                 nfc_err(dev->dev,
1708                         "Error 0x%x when releasing the target\n", rc);
1709
1710         dev_kfree_skb(resp);
1711         return rc;
1712 }
1713
1714 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1715                                     struct nfc_target *target, u8 mode)
1716 {
1717         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1718         struct sk_buff *skb;
1719         int rc;
1720
1721         dev_dbg(dev->dev, "%s\n", __func__);
1722
1723         if (!dev->tgt_active_prot) {
1724                 nfc_err(dev->dev, "There is no active target\n");
1725                 return;
1726         }
1727
1728         dev->tgt_active_prot = 0;
1729         skb_queue_purge(&dev->resp_q);
1730
1731         skb = pn533_alloc_skb(dev, sizeof(u8));
1732         if (!skb)
1733                 return;
1734
1735         *skb_put(skb, 1) = 1; /* TG*/
1736
1737         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb,
1738                                   pn533_deactivate_target_complete, NULL);
1739         if (rc < 0) {
1740                 dev_kfree_skb(skb);
1741                 nfc_err(dev->dev, "Target release error %d\n", rc);
1742         }
1743 }
1744
1745
1746 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1747                                          struct sk_buff *resp)
1748 {
1749         struct pn533_cmd_jump_dep_response *rsp;
1750         u8 target_gt_len;
1751         int rc;
1752         u8 active = *(u8 *)arg;
1753
1754         kfree(arg);
1755
1756         if (IS_ERR(resp))
1757                 return PTR_ERR(resp);
1758
1759         if (dev->tgt_available_prots &&
1760             !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1761                 nfc_err(dev->dev,
1762                         "The target does not support DEP\n");
1763                 rc =  -EINVAL;
1764                 goto error;
1765         }
1766
1767         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1768
1769         rc = rsp->status & PN533_CMD_RET_MASK;
1770         if (rc != PN533_CMD_RET_SUCCESS) {
1771                 nfc_err(dev->dev,
1772                         "Bringing DEP link up failed (error 0x%x)\n", rc);
1773                 goto error;
1774         }
1775
1776         if (!dev->tgt_available_prots) {
1777                 struct nfc_target nfc_target;
1778
1779                 dev_dbg(dev->dev, "Creating new target\n");
1780
1781                 memset(&nfc_target, 0, sizeof(struct nfc_target));
1782
1783                 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1784                 nfc_target.nfcid1_len = 10;
1785                 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1786                 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1787                 if (rc)
1788                         goto error;
1789
1790                 dev->tgt_available_prots = 0;
1791         }
1792
1793         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1794
1795         /* ATR_RES general bytes are located at offset 17 */
1796         target_gt_len = resp->len - 17;
1797         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1798                                           rsp->gt, target_gt_len);
1799         if (rc == 0)
1800                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1801                                         dev->nfc_dev->targets[0].idx,
1802                                         !active, NFC_RF_INITIATOR);
1803
1804 error:
1805         dev_kfree_skb(resp);
1806         return rc;
1807 }
1808
1809 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
1810 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1811                              u8 comm_mode, u8 *gb, size_t gb_len)
1812 {
1813         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1814         struct sk_buff *skb;
1815         int rc, skb_len;
1816         u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
1817         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1818
1819         dev_dbg(dev->dev, "%s\n", __func__);
1820
1821         if (dev->poll_mod_count) {
1822                 nfc_err(dev->dev,
1823                         "Cannot bring the DEP link up while polling\n");
1824                 return -EBUSY;
1825         }
1826
1827         if (dev->tgt_active_prot) {
1828                 nfc_err(dev->dev,
1829                         "There is already an active target\n");
1830                 return -EBUSY;
1831         }
1832
1833         skb_len = 3 + gb_len; /* ActPass + BR + Next */
1834         skb_len += PASSIVE_DATA_LEN;
1835
1836         /* NFCID3 */
1837         skb_len += NFC_NFCID3_MAXSIZE;
1838         if (target && !target->nfcid2_len) {
1839                 nfcid3[0] = 0x1;
1840                 nfcid3[1] = 0xfe;
1841                 get_random_bytes(nfcid3 + 2, 6);
1842         }
1843
1844         skb = pn533_alloc_skb(dev, skb_len);
1845         if (!skb)
1846                 return -ENOMEM;
1847
1848         *skb_put(skb, 1) = !comm_mode;  /* ActPass */
1849         *skb_put(skb, 1) = 0x02;  /* 424 kbps */
1850
1851         next = skb_put(skb, 1);  /* Next */
1852         *next = 0;
1853
1854         /* Copy passive data */
1855         memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
1856         *next |= 1;
1857
1858         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1859         if (target && target->nfcid2_len)
1860                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
1861                        target->nfcid2_len);
1862         else
1863                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
1864                        NFC_NFCID3_MAXSIZE);
1865         *next |= 2;
1866
1867         if (gb != NULL && gb_len > 0) {
1868                 memcpy(skb_put(skb, gb_len), gb, gb_len);
1869                 *next |= 4; /* We have some Gi */
1870         } else {
1871                 *next = 0;
1872         }
1873
1874         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
1875         if (!arg) {
1876                 dev_kfree_skb(skb);
1877                 return -ENOMEM;
1878         }
1879
1880         *arg = !comm_mode;
1881
1882         pn533_rf_field(dev->nfc_dev, 0);
1883
1884         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1885                                   pn533_in_dep_link_up_complete, arg);
1886
1887         if (rc < 0) {
1888                 dev_kfree_skb(skb);
1889                 kfree(arg);
1890         }
1891
1892         return rc;
1893 }
1894
1895 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
1896 {
1897         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1898
1899         dev_dbg(dev->dev, "%s\n", __func__);
1900
1901         pn533_poll_reset_mod_list(dev);
1902
1903         if (dev->tgt_mode || dev->tgt_active_prot)
1904                 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1905
1906         dev->tgt_active_prot = 0;
1907         dev->tgt_mode = 0;
1908
1909         skb_queue_purge(&dev->resp_q);
1910
1911         return 0;
1912 }
1913
1914 struct pn533_data_exchange_arg {
1915         data_exchange_cb_t cb;
1916         void *cb_context;
1917 };
1918
1919 static struct sk_buff *pn533_build_response(struct pn533 *dev)
1920 {
1921         struct sk_buff *skb, *tmp, *t;
1922         unsigned int skb_len = 0, tmp_len = 0;
1923
1924         dev_dbg(dev->dev, "%s\n", __func__);
1925
1926         if (skb_queue_empty(&dev->resp_q))
1927                 return NULL;
1928
1929         if (skb_queue_len(&dev->resp_q) == 1) {
1930                 skb = skb_dequeue(&dev->resp_q);
1931                 goto out;
1932         }
1933
1934         skb_queue_walk_safe(&dev->resp_q, tmp, t)
1935                 skb_len += tmp->len;
1936
1937         dev_dbg(dev->dev, "%s total length %d\n",
1938                 __func__, skb_len);
1939
1940         skb = alloc_skb(skb_len, GFP_KERNEL);
1941         if (skb == NULL)
1942                 goto out;
1943
1944         skb_put(skb, skb_len);
1945
1946         skb_queue_walk_safe(&dev->resp_q, tmp, t) {
1947                 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
1948                 tmp_len += tmp->len;
1949         }
1950
1951 out:
1952         skb_queue_purge(&dev->resp_q);
1953
1954         return skb;
1955 }
1956
1957 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
1958                                         struct sk_buff *resp)
1959 {
1960         struct pn533_data_exchange_arg *arg = _arg;
1961         struct sk_buff *skb;
1962         int rc = 0;
1963         u8 status, ret, mi;
1964
1965         dev_dbg(dev->dev, "%s\n", __func__);
1966
1967         if (IS_ERR(resp)) {
1968                 rc = PTR_ERR(resp);
1969                 goto _error;
1970         }
1971
1972         status = resp->data[0];
1973         ret = status & PN533_CMD_RET_MASK;
1974         mi = status & PN533_CMD_MI_MASK;
1975
1976         skb_pull(resp, sizeof(status));
1977
1978         if (ret != PN533_CMD_RET_SUCCESS) {
1979                 nfc_err(dev->dev,
1980                         "Exchanging data failed (error 0x%x)\n", ret);
1981                 rc = -EIO;
1982                 goto error;
1983         }
1984
1985         skb_queue_tail(&dev->resp_q, resp);
1986
1987         if (mi) {
1988                 dev->cmd_complete_mi_arg = arg;
1989                 queue_work(dev->wq, &dev->mi_rx_work);
1990                 return -EINPROGRESS;
1991         }
1992
1993         /* Prepare for the next round */
1994         if (skb_queue_len(&dev->fragment_skb) > 0) {
1995                 dev->cmd_complete_dep_arg = arg;
1996                 queue_work(dev->wq, &dev->mi_tx_work);
1997
1998                 return -EINPROGRESS;
1999         }
2000
2001         skb = pn533_build_response(dev);
2002         if (!skb) {
2003                 rc = -ENOMEM;
2004                 goto error;
2005         }
2006
2007         arg->cb(arg->cb_context, skb, 0);
2008         kfree(arg);
2009         return 0;
2010
2011 error:
2012         dev_kfree_skb(resp);
2013 _error:
2014         skb_queue_purge(&dev->resp_q);
2015         arg->cb(arg->cb_context, NULL, rc);
2016         kfree(arg);
2017         return rc;
2018 }
2019
2020 /*
2021  * Receive an incoming pn533 frame. skb contains only header and payload.
2022  * If skb == NULL, it is a notification that the link below is dead.
2023  */
2024 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2025 {
2026         if (!dev->cmd)
2027                 goto sched_wq;
2028
2029         dev->cmd->status = status;
2030
2031         if (status != 0) {
2032                 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2033                 goto sched_wq;
2034         }
2035
2036         if (skb == NULL) {
2037                 pr_err("NULL Frame -> link is dead\n");
2038                 goto sched_wq;
2039         }
2040
2041         if (pn533_rx_frame_is_ack(skb->data)) {
2042                 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2043                 dev_kfree_skb(skb);
2044                 return;
2045         }
2046
2047         print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2048                              dev->ops->rx_frame_size(skb->data), false);
2049
2050         if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2051                 nfc_err(dev->dev, "Received an invalid frame\n");
2052                 dev->cmd->status = -EIO;
2053         } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2054                 nfc_err(dev->dev, "It it not the response to the last command\n");
2055                 dev->cmd->status = -EIO;
2056         }
2057
2058         dev->cmd->resp = skb;
2059
2060 sched_wq:
2061         queue_work(dev->wq, &dev->cmd_complete_work);
2062 }
2063 EXPORT_SYMBOL(pn533_recv_frame);
2064
2065 /* Split the Tx skb into small chunks */
2066 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2067 {
2068         struct sk_buff *frag;
2069         int  frag_size;
2070
2071         do {
2072                 /* Remaining size */
2073                 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2074                         frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2075                 else
2076                         frag_size = skb->len;
2077
2078                 /* Allocate and reserve */
2079                 frag = pn533_alloc_skb(dev, frag_size);
2080                 if (!frag) {
2081                         skb_queue_purge(&dev->fragment_skb);
2082                         return -ENOMEM;
2083                 }
2084
2085                 if (!dev->tgt_mode) {
2086                         /* Reserve the TG/MI byte */
2087                         skb_reserve(frag, 1);
2088
2089                         /* MI + TG */
2090                         if (frag_size  == PN533_CMD_DATAFRAME_MAXLEN)
2091                                 *skb_push(frag, sizeof(u8)) =
2092                                                         (PN533_CMD_MI_MASK | 1);
2093                         else
2094                                 *skb_push(frag, sizeof(u8)) =  1; /* TG */
2095                 }
2096
2097                 memcpy(skb_put(frag, frag_size), skb->data, frag_size);
2098
2099                 /* Reduce the size of incoming buffer */
2100                 skb_pull(skb, frag_size);
2101
2102                 /* Add this to skb_queue */
2103                 skb_queue_tail(&dev->fragment_skb, frag);
2104
2105         } while (skb->len > 0);
2106
2107         dev_kfree_skb(skb);
2108
2109         return skb_queue_len(&dev->fragment_skb);
2110 }
2111
2112 static int pn533_transceive(struct nfc_dev *nfc_dev,
2113                             struct nfc_target *target, struct sk_buff *skb,
2114                             data_exchange_cb_t cb, void *cb_context)
2115 {
2116         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2117         struct pn533_data_exchange_arg *arg = NULL;
2118         int rc;
2119
2120         dev_dbg(dev->dev, "%s\n", __func__);
2121
2122         if (!dev->tgt_active_prot) {
2123                 nfc_err(dev->dev,
2124                         "Can't exchange data if there is no active target\n");
2125                 rc = -EINVAL;
2126                 goto error;
2127         }
2128
2129         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2130         if (!arg) {
2131                 rc = -ENOMEM;
2132                 goto error;
2133         }
2134
2135         arg->cb = cb;
2136         arg->cb_context = cb_context;
2137
2138         switch (dev->device_type) {
2139         case PN533_DEVICE_PASORI:
2140                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2141                         rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2142                                                    skb,
2143                                                    pn533_data_exchange_complete,
2144                                                    arg);
2145
2146                         break;
2147                 }
2148         default:
2149                 /* jumbo frame ? */
2150                 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2151                         rc = pn533_fill_fragment_skbs(dev, skb);
2152                         if (rc < 0)
2153                                 goto error;
2154
2155                         skb = skb_dequeue(&dev->fragment_skb);
2156                         if (!skb) {
2157                                 rc = -EIO;
2158                                 goto error;
2159                         }
2160                 } else {
2161                         *skb_push(skb, sizeof(u8)) =  1; /* TG */
2162                 }
2163
2164                 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2165                                            skb, pn533_data_exchange_complete,
2166                                            arg);
2167
2168                 break;
2169         }
2170
2171         if (rc < 0) /* rc from send_async */
2172                 goto error;
2173
2174         return 0;
2175
2176 error:
2177         kfree(arg);
2178         dev_kfree_skb(skb);
2179         return rc;
2180 }
2181
2182 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2183                                   struct sk_buff *resp)
2184 {
2185         u8 status;
2186
2187         dev_dbg(dev->dev, "%s\n", __func__);
2188
2189         if (IS_ERR(resp))
2190                 return PTR_ERR(resp);
2191
2192         status = resp->data[0];
2193
2194         /* Prepare for the next round */
2195         if (skb_queue_len(&dev->fragment_skb) > 0) {
2196                 queue_work(dev->wq, &dev->mi_tm_tx_work);
2197                 return -EINPROGRESS;
2198         }
2199         dev_kfree_skb(resp);
2200
2201         if (status != 0) {
2202                 nfc_tm_deactivated(dev->nfc_dev);
2203
2204                 dev->tgt_mode = 0;
2205
2206                 return 0;
2207         }
2208
2209         queue_work(dev->wq, &dev->tg_work);
2210
2211         return 0;
2212 }
2213
2214 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2215 {
2216         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2217         int rc;
2218
2219         dev_dbg(dev->dev, "%s\n", __func__);
2220
2221         /* let's split in multiple chunks if size's too big */
2222         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2223                 rc = pn533_fill_fragment_skbs(dev, skb);
2224                 if (rc < 0)
2225                         goto error;
2226
2227                 /* get the first skb */
2228                 skb = skb_dequeue(&dev->fragment_skb);
2229                 if (!skb) {
2230                         rc = -EIO;
2231                         goto error;
2232                 }
2233
2234                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2235                                                 pn533_tm_send_complete, NULL);
2236         } else {
2237                 /* Send th skb */
2238                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2239                                                 pn533_tm_send_complete, NULL);
2240         }
2241
2242 error:
2243         if (rc < 0) {
2244                 dev_kfree_skb(skb);
2245                 skb_queue_purge(&dev->fragment_skb);
2246         }
2247
2248         return rc;
2249 }
2250
2251 static void pn533_wq_mi_recv(struct work_struct *work)
2252 {
2253         struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2254         struct sk_buff *skb;
2255         int rc;
2256
2257         dev_dbg(dev->dev, "%s\n", __func__);
2258
2259         skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2260         if (!skb)
2261                 goto error;
2262
2263         switch (dev->device_type) {
2264         case PN533_DEVICE_PASORI:
2265                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2266                         rc = pn533_send_cmd_direct_async(dev,
2267                                                 PN533_CMD_IN_COMM_THRU,
2268                                                 skb,
2269                                                 pn533_data_exchange_complete,
2270                                                  dev->cmd_complete_mi_arg);
2271
2272                         break;
2273                 }
2274         default:
2275                 *skb_put(skb, sizeof(u8)) =  1; /*TG*/
2276
2277                 rc = pn533_send_cmd_direct_async(dev,
2278                                                  PN533_CMD_IN_DATA_EXCHANGE,
2279                                                  skb,
2280                                                  pn533_data_exchange_complete,
2281                                                  dev->cmd_complete_mi_arg);
2282
2283                 break;
2284         }
2285
2286         if (rc == 0) /* success */
2287                 return;
2288
2289         nfc_err(dev->dev,
2290                 "Error %d when trying to perform data_exchange\n", rc);
2291
2292         dev_kfree_skb(skb);
2293         kfree(dev->cmd_complete_mi_arg);
2294
2295 error:
2296         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2297         queue_work(dev->wq, &dev->cmd_work);
2298 }
2299
2300 static void pn533_wq_mi_send(struct work_struct *work)
2301 {
2302         struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2303         struct sk_buff *skb;
2304         int rc;
2305
2306         dev_dbg(dev->dev, "%s\n", __func__);
2307
2308         /* Grab the first skb in the queue */
2309         skb = skb_dequeue(&dev->fragment_skb);
2310
2311         if (skb == NULL) {      /* No more data */
2312                 /* Reset the queue for future use */
2313                 skb_queue_head_init(&dev->fragment_skb);
2314                 goto error;
2315         }
2316
2317         switch (dev->device_type) {
2318         case PN533_DEVICE_PASORI:
2319                 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2320                         rc = -EIO;
2321                         break;
2322                 }
2323
2324                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2325                                                  skb,
2326                                                  pn533_data_exchange_complete,
2327                                                  dev->cmd_complete_dep_arg);
2328
2329                 break;
2330
2331         default:
2332                 /* Still some fragments? */
2333                 rc = pn533_send_cmd_direct_async(dev,
2334                                                  PN533_CMD_IN_DATA_EXCHANGE,
2335                                                  skb,
2336                                                  pn533_data_exchange_complete,
2337                                                  dev->cmd_complete_dep_arg);
2338
2339                 break;
2340         }
2341
2342         if (rc == 0) /* success */
2343                 return;
2344
2345         nfc_err(dev->dev,
2346                 "Error %d when trying to perform data_exchange\n", rc);
2347
2348         dev_kfree_skb(skb);
2349         kfree(dev->cmd_complete_dep_arg);
2350
2351 error:
2352         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2353         queue_work(dev->wq, &dev->cmd_work);
2354 }
2355
2356 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2357                                                                 u8 cfgdata_len)
2358 {
2359         struct sk_buff *skb;
2360         struct sk_buff *resp;
2361         int skb_len;
2362
2363         dev_dbg(dev->dev, "%s\n", __func__);
2364
2365         skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2366
2367         skb = pn533_alloc_skb(dev, skb_len);
2368         if (!skb)
2369                 return -ENOMEM;
2370
2371         *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2372         memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2373
2374         resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2375         if (IS_ERR(resp))
2376                 return PTR_ERR(resp);
2377
2378         dev_kfree_skb(resp);
2379         return 0;
2380 }
2381
2382 static int pn533_get_firmware_version(struct pn533 *dev,
2383                                       struct pn533_fw_version *fv)
2384 {
2385         struct sk_buff *skb;
2386         struct sk_buff *resp;
2387
2388         skb = pn533_alloc_skb(dev, 0);
2389         if (!skb)
2390                 return -ENOMEM;
2391
2392         resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2393         if (IS_ERR(resp))
2394                 return PTR_ERR(resp);
2395
2396         fv->ic = resp->data[0];
2397         fv->ver = resp->data[1];
2398         fv->rev = resp->data[2];
2399         fv->support = resp->data[3];
2400
2401         dev_kfree_skb(resp);
2402         return 0;
2403 }
2404
2405 static int pn533_pasori_fw_reset(struct pn533 *dev)
2406 {
2407         struct sk_buff *skb;
2408         struct sk_buff *resp;
2409
2410         dev_dbg(dev->dev, "%s\n", __func__);
2411
2412         skb = pn533_alloc_skb(dev, sizeof(u8));
2413         if (!skb)
2414                 return -ENOMEM;
2415
2416         *skb_put(skb, sizeof(u8)) = 0x1;
2417
2418         resp = pn533_send_cmd_sync(dev, 0x18, skb);
2419         if (IS_ERR(resp))
2420                 return PTR_ERR(resp);
2421
2422         dev_kfree_skb(resp);
2423
2424         return 0;
2425 }
2426
2427 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2428 {
2429         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2430         u8 rf_field = !!rf;
2431         int rc;
2432
2433         rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2434
2435         rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2436                                      (u8 *)&rf_field, 1);
2437         if (rc) {
2438                 nfc_err(dev->dev, "Error on setting RF field\n");
2439                 return rc;
2440         }
2441
2442         return rc;
2443 }
2444
2445 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2446 {
2447         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2448         struct sk_buff *skb;
2449         struct sk_buff *resp;
2450
2451         skb = pn533_alloc_skb(dev, 1);
2452         if (!skb)
2453                 return -ENOMEM;
2454
2455         *skb_put(skb, 1) = 0x01;
2456
2457         resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2458         if (IS_ERR(resp))
2459                 return PTR_ERR(resp);
2460
2461         dev_kfree_skb(resp);
2462         return 0;
2463 }
2464
2465 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2466 {
2467         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2468
2469         if (dev->device_type == PN533_DEVICE_PN532) {
2470                 int rc = pn532_sam_configuration(nfc_dev);
2471
2472                 if (rc)
2473                         return rc;
2474         }
2475
2476         return pn533_rf_field(nfc_dev, 1);
2477 }
2478
2479 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2480 {
2481         return pn533_rf_field(nfc_dev, 0);
2482 }
2483
2484 static struct nfc_ops pn533_nfc_ops = {
2485         .dev_up = pn533_dev_up,
2486         .dev_down = pn533_dev_down,
2487         .dep_link_up = pn533_dep_link_up,
2488         .dep_link_down = pn533_dep_link_down,
2489         .start_poll = pn533_start_poll,
2490         .stop_poll = pn533_stop_poll,
2491         .activate_target = pn533_activate_target,
2492         .deactivate_target = pn533_deactivate_target,
2493         .im_transceive = pn533_transceive,
2494         .tm_send = pn533_tm_send,
2495 };
2496
2497 static int pn533_setup(struct pn533 *dev)
2498 {
2499         struct pn533_config_max_retries max_retries;
2500         struct pn533_config_timing timing;
2501         u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2502         int rc;
2503
2504         switch (dev->device_type) {
2505         case PN533_DEVICE_STD:
2506         case PN533_DEVICE_PASORI:
2507         case PN533_DEVICE_ACR122U:
2508         case PN533_DEVICE_PN532:
2509                 max_retries.mx_rty_atr = 0x2;
2510                 max_retries.mx_rty_psl = 0x1;
2511                 max_retries.mx_rty_passive_act =
2512                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2513
2514                 timing.rfu = PN533_CONFIG_TIMING_102;
2515                 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2516                 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2517
2518                 break;
2519
2520         default:
2521                 nfc_err(dev->dev, "Unknown device type %d\n",
2522                         dev->device_type);
2523                 return -EINVAL;
2524         }
2525
2526         rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2527                                      (u8 *)&max_retries, sizeof(max_retries));
2528         if (rc) {
2529                 nfc_err(dev->dev,
2530                         "Error on setting MAX_RETRIES config\n");
2531                 return rc;
2532         }
2533
2534
2535         rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2536                                      (u8 *)&timing, sizeof(timing));
2537         if (rc) {
2538                 nfc_err(dev->dev, "Error on setting RF timings\n");
2539                 return rc;
2540         }
2541
2542         switch (dev->device_type) {
2543         case PN533_DEVICE_STD:
2544         case PN533_DEVICE_PN532:
2545                 break;
2546
2547         case PN533_DEVICE_PASORI:
2548                 pn533_pasori_fw_reset(dev);
2549
2550                 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2551                                              pasori_cfg, 3);
2552                 if (rc) {
2553                         nfc_err(dev->dev,
2554                                 "Error while settings PASORI config\n");
2555                         return rc;
2556                 }
2557
2558                 pn533_pasori_fw_reset(dev);
2559
2560                 break;
2561         }
2562
2563         return 0;
2564 }
2565
2566 struct pn533 *pn533_register_device(u32 device_type,
2567                                 u32 protocols,
2568                                 enum pn533_protocol_type protocol_type,
2569                                 void *phy,
2570                                 struct pn533_phy_ops *phy_ops,
2571                                 struct pn533_frame_ops *fops,
2572                                 struct device *dev,
2573                                 struct device *parent)
2574 {
2575         struct pn533_fw_version fw_ver;
2576         struct pn533 *priv;
2577         int rc = -ENOMEM;
2578
2579         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2580         if (!priv)
2581                 return ERR_PTR(-ENOMEM);
2582
2583         priv->phy = phy;
2584         priv->phy_ops = phy_ops;
2585         priv->dev = dev;
2586         if (fops != NULL)
2587                 priv->ops = fops;
2588         else
2589                 priv->ops = &pn533_std_frame_ops;
2590
2591         priv->protocol_type = protocol_type;
2592         priv->device_type = device_type;
2593
2594         mutex_init(&priv->cmd_lock);
2595
2596         INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2597         INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2598         INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2599         INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2600         INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2601         INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2602         INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2603         INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2604         INIT_WORK(&priv->rf_work, pn533_wq_rf);
2605         priv->wq = alloc_ordered_workqueue("pn533", 0);
2606         if (priv->wq == NULL)
2607                 goto error;
2608
2609         init_timer(&priv->listen_timer);
2610         priv->listen_timer.data = (unsigned long) priv;
2611         priv->listen_timer.function = pn533_listen_mode_timer;
2612
2613         skb_queue_head_init(&priv->resp_q);
2614         skb_queue_head_init(&priv->fragment_skb);
2615
2616         INIT_LIST_HEAD(&priv->cmd_queue);
2617
2618         memset(&fw_ver, 0, sizeof(fw_ver));
2619         rc = pn533_get_firmware_version(priv, &fw_ver);
2620         if (rc < 0)
2621                 goto destroy_wq;
2622
2623         nfc_info(dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2624                  fw_ver.ic, fw_ver.ver, fw_ver.rev);
2625
2626
2627         priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2628                                            priv->ops->tx_header_len +
2629                                            PN533_CMD_DATAEXCH_HEAD_LEN,
2630                                            priv->ops->tx_tail_len);
2631         if (!priv->nfc_dev) {
2632                 rc = -ENOMEM;
2633                 goto destroy_wq;
2634         }
2635
2636         nfc_set_parent_dev(priv->nfc_dev, parent);
2637         nfc_set_drvdata(priv->nfc_dev, priv);
2638
2639         rc = nfc_register_device(priv->nfc_dev);
2640         if (rc)
2641                 goto free_nfc_dev;
2642
2643         rc = pn533_setup(priv);
2644         if (rc)
2645                 goto unregister_nfc_dev;
2646
2647         return priv;
2648
2649 unregister_nfc_dev:
2650         nfc_unregister_device(priv->nfc_dev);
2651
2652 free_nfc_dev:
2653         nfc_free_device(priv->nfc_dev);
2654
2655 destroy_wq:
2656         destroy_workqueue(priv->wq);
2657 error:
2658         kfree(priv);
2659         return ERR_PTR(rc);
2660 }
2661 EXPORT_SYMBOL_GPL(pn533_register_device);
2662
2663 void pn533_unregister_device(struct pn533 *priv)
2664 {
2665         struct pn533_cmd *cmd, *n;
2666
2667         nfc_unregister_device(priv->nfc_dev);
2668         nfc_free_device(priv->nfc_dev);
2669
2670         flush_delayed_work(&priv->poll_work);
2671         destroy_workqueue(priv->wq);
2672
2673         skb_queue_purge(&priv->resp_q);
2674
2675         del_timer(&priv->listen_timer);
2676
2677         list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2678                 list_del(&cmd->queue);
2679                 kfree(cmd);
2680         }
2681
2682         kfree(priv);
2683 }
2684 EXPORT_SYMBOL_GPL(pn533_unregister_device);
2685
2686
2687 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
2688 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2689 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
2690 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2691 MODULE_VERSION(VERSION);
2692 MODULE_LICENSE("GPL");