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         return true;
 682 }
 683
 684 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
 685                                                         int tgt_data_len)
 686 {
 687         struct pn533_target_type_a *tgt_type_a;
 688
 689         tgt_type_a = (struct pn533_target_type_a *)tgt_data;
 690
 691         if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
 692                 return -EPROTO;
 693
 694         switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
 695         case PN533_TYPE_A_SEL_PROT_MIFARE:
 696                 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
 697                 break;
 698         case PN533_TYPE_A_SEL_PROT_ISO14443:
 699                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
 700                 break;
 701         case PN533_TYPE_A_SEL_PROT_DEP:
 702                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 703                 break;
 704         case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
 705                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
 706                                                         NFC_PROTO_NFC_DEP_MASK;
 707                 break;
 708         }
 709
 710         nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
 711         nfc_tgt->sel_res = tgt_type_a->sel_res;
 712         nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
 713         memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
 714
 715         return 0;
 716 }
 717
 718 struct pn533_target_felica {
 719         u8 pol_res;
 720         u8 opcode;
 721         u8 nfcid2[NFC_NFCID2_MAXSIZE];
 722         u8 pad[8];
 723         /* optional */
 724         u8 syst_code[];
 725 } __packed;
 726
 727 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
 728 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
 729
 730 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
 731                                                         int target_data_len)
 732 {
 733         if (target_data_len < sizeof(struct pn533_target_felica))
 734                 return false;
 735
 736         if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
 737                 return false;
 738
 739         return true;
 740 }
 741
 742 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
 743                                                         int tgt_data_len)
 744 {
 745         struct pn533_target_felica *tgt_felica;
 746
 747         tgt_felica = (struct pn533_target_felica *)tgt_data;
 748
 749         if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
 750                 return -EPROTO;
 751
 752         if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
 753             (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
 754                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 755         else
 756                 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
 757
 758         memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
 759         nfc_tgt->sensf_res_len = 9;
 760
 761         memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
 762         nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
 763
 764         return 0;
 765 }
 766
 767 struct pn533_target_jewel {
 768         __be16 sens_res;
 769         u8 jewelid[4];
 770 } __packed;
 771
 772 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
 773                                                         int target_data_len)
 774 {
 775         u8 ssd;
 776         u8 platconf;
 777
 778         if (target_data_len < sizeof(struct pn533_target_jewel))
 779                 return false;
 780
 781         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
 782         ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
 783         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
 784
 785         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 786              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
 787             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 788              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
 789                 return false;
 790
 791         return true;
 792 }
 793
 794 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
 795                                                         int tgt_data_len)
 796 {
 797         struct pn533_target_jewel *tgt_jewel;
 798
 799         tgt_jewel = (struct pn533_target_jewel *)tgt_data;
 800
 801         if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
 802                 return -EPROTO;
 803
 804         nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
 805         nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
 806         nfc_tgt->nfcid1_len = 4;
 807         memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
 808
 809         return 0;
 810 }
 811
 812 struct pn533_type_b_prot_info {
 813         u8 bitrate;
 814         u8 fsci_type;
 815         u8 fwi_adc_fo;
 816 } __packed;
 817
 818 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
 819 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
 820 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
 821
 822 struct pn533_type_b_sens_res {
 823         u8 opcode;
 824         u8 nfcid[4];
 825         u8 appdata[4];
 826         struct pn533_type_b_prot_info prot_info;
 827 } __packed;
 828
 829 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
 830
 831 struct pn533_target_type_b {
 832         struct pn533_type_b_sens_res sensb_res;
 833         u8 attrib_res_len;
 834         u8 attrib_res[];
 835 } __packed;
 836
 837 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
 838                                                         int target_data_len)
 839 {
 840         if (target_data_len < sizeof(struct pn533_target_type_b))
 841                 return false;
 842
 843         if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
 844                 return false;
 845
 846         if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
 847                                                 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
 848                 return false;
 849
 850         return true;
 851 }
 852
 853 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
 854                                                         int tgt_data_len)
 855 {
 856         struct pn533_target_type_b *tgt_type_b;
 857
 858         tgt_type_b = (struct pn533_target_type_b *)tgt_data;
 859
 860         if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
 861                 return -EPROTO;
 862
 863         nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
 864
 865         return 0;
 866 }
 867
 868 static void pn533_poll_reset_mod_list(struct pn533 *dev);
 869 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
 870                               int tgdata_len)
 871 {
 872         struct nfc_target nfc_tgt;
 873         int rc;
 874
 875         dev_dbg(dev->dev, "%s: modulation=%d\n",
 876                 __func__, dev->poll_mod_curr);
 877
 878         if (tg != 1)
 879                 return -EPROTO;
 880
 881         memset(&nfc_tgt, 0, sizeof(struct nfc_target));
 882
 883         switch (dev->poll_mod_curr) {
 884         case PN533_POLL_MOD_106KBPS_A:
 885                 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
 886                 break;
 887         case PN533_POLL_MOD_212KBPS_FELICA:
 888         case PN533_POLL_MOD_424KBPS_FELICA:
 889                 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
 890                 break;
 891         case PN533_POLL_MOD_106KBPS_JEWEL:
 892                 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
 893                 break;
 894         case PN533_POLL_MOD_847KBPS_B:
 895                 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
 896                 break;
 897         default:
 898                 nfc_err(dev->dev,
 899                         "Unknown current poll modulation\n");
 900                 return -EPROTO;
 901         }
 902
 903         if (rc)
 904                 return rc;
 905
 906         if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
 907                 dev_dbg(dev->dev,
 908                         "The Tg found doesn't have the desired protocol\n");
 909                 return -EAGAIN;
 910         }
 911
 912         dev_dbg(dev->dev,
 913                 "Target found - supported protocols: 0x%x\n",
 914                 nfc_tgt.supported_protocols);
 915
 916         dev->tgt_available_prots = nfc_tgt.supported_protocols;
 917
 918         pn533_poll_reset_mod_list(dev);
 919         nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
 920
 921         return 0;
 922 }
 923
 924 static inline void pn533_poll_next_mod(struct pn533 *dev)
 925 {
 926         dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
 927 }
 928
 929 static void pn533_poll_reset_mod_list(struct pn533 *dev)
 930 {
 931         dev->poll_mod_count = 0;
 932 }
 933
 934 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
 935 {
 936         dev->poll_mod_active[dev->poll_mod_count] =
 937                 (struct pn533_poll_modulations *)&poll_mod[mod_index];
 938         dev->poll_mod_count++;
 939 }
 940
 941 static void pn533_poll_create_mod_list(struct pn533 *dev,
 942                                        u32 im_protocols, u32 tm_protocols)
 943 {
 944         pn533_poll_reset_mod_list(dev);
 945
 946         if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
 947             (im_protocols & NFC_PROTO_ISO14443_MASK) ||
 948             (im_protocols & NFC_PROTO_NFC_DEP_MASK))
 949                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
 950
 951         if (im_protocols & NFC_PROTO_FELICA_MASK ||
 952             im_protocols & NFC_PROTO_NFC_DEP_MASK) {
 953                 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
 954                 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
 955         }
 956
 957         if (im_protocols & NFC_PROTO_JEWEL_MASK)
 958                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
 959
 960         if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
 961                 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
 962
 963         if (tm_protocols)
 964                 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
 965 }
 966
 967 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
 968 {
 969         u8 nbtg, tg, *tgdata;
 970         int rc, tgdata_len;
 971
 972         /* Toggle the DEP polling */
 973         if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK)
 974                 dev->poll_dep = 1;
 975
 976         nbtg = resp->data[0];
 977         tg = resp->data[1];
 978         tgdata = &resp->data[2];
 979         tgdata_len = resp->len - 2;  /* nbtg + tg */
 980
 981         if (nbtg) {
 982                 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
 983
 984                 /* We must stop the poll after a valid target found */
 985                 if (rc == 0)
 986                         return 0;
 987         }
 988
 989         return -EAGAIN;
 990 }
 991
 992 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
 993 {
 994         struct sk_buff *skb;
 995         u8 *felica, *nfcid3, *gb;
 996
 997         u8 *gbytes = dev->gb;
 998         size_t gbytes_len = dev->gb_len;
 999
1000         u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1001                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1002                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1003                                 0xff, 0xff}; /* System code */
1004
1005         u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1006                                0x0, 0x0, 0x0,
1007                                0x40}; /* SEL_RES for DEP */
1008
1009         unsigned int skb_len = 36 + /*
1010                                      * mode (1), mifare (6),
1011                                      * felica (18), nfcid3 (10), gb_len (1)
1012                                      */
1013                                gbytes_len +
1014                                1;  /* len Tk*/
1015
1016         skb = pn533_alloc_skb(dev, skb_len);
1017         if (!skb)
1018                 return NULL;
1019
1020         /* DEP support only */
1021         *skb_put(skb, 1) = PN533_INIT_TARGET_DEP;
1022
1023         /* MIFARE params */
1024         memcpy(skb_put(skb, 6), mifare_params, 6);
1025
1026         /* Felica params */
1027         felica = skb_put(skb, 18);
1028         memcpy(felica, felica_params, 18);
1029         get_random_bytes(felica + 2, 6);
1030
1031         /* NFCID3 */
1032         nfcid3 = skb_put(skb, 10);
1033         memset(nfcid3, 0, 10);
1034         memcpy(nfcid3, felica, 8);
1035
1036         /* General bytes */
1037         *skb_put(skb, 1) = gbytes_len;
1038
1039         gb = skb_put(skb, gbytes_len);
1040         memcpy(gb, gbytes, gbytes_len);
1041
1042         /* Len Tk */
1043         *skb_put(skb, 1) = 0;
1044
1045         return skb;
1046 }
1047
1048 static void pn533_wq_tm_mi_recv(struct work_struct *work);
1049 static struct sk_buff *pn533_build_response(struct pn533 *dev);
1050
1051 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1052                                       struct sk_buff *resp)
1053 {
1054         struct sk_buff *skb;
1055         u8 status, ret, mi;
1056         int rc;
1057
1058         dev_dbg(dev->dev, "%s\n", __func__);
1059
1060         if (IS_ERR(resp)) {
1061                 skb_queue_purge(&dev->resp_q);
1062                 return PTR_ERR(resp);
1063         }
1064
1065         status = resp->data[0];
1066
1067         ret = status & PN533_CMD_RET_MASK;
1068         mi = status & PN533_CMD_MI_MASK;
1069
1070         skb_pull(resp, sizeof(status));
1071
1072         if (ret != PN533_CMD_RET_SUCCESS) {
1073                 rc = -EIO;
1074                 goto error;
1075         }
1076
1077         skb_queue_tail(&dev->resp_q, resp);
1078
1079         if (mi) {
1080                 queue_work(dev->wq, &dev->mi_tm_rx_work);
1081                 return -EINPROGRESS;
1082         }
1083
1084         skb = pn533_build_response(dev);
1085         if (!skb) {
1086                 rc = -EIO;
1087                 goto error;
1088         }
1089
1090         return nfc_tm_data_received(dev->nfc_dev, skb);
1091
1092 error:
1093         nfc_tm_deactivated(dev->nfc_dev);
1094         dev->tgt_mode = 0;
1095         skb_queue_purge(&dev->resp_q);
1096         dev_kfree_skb(resp);
1097
1098         return rc;
1099 }
1100
1101 static void pn533_wq_tm_mi_recv(struct work_struct *work)
1102 {
1103         struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work);
1104         struct sk_buff *skb;
1105         int rc;
1106
1107         dev_dbg(dev->dev, "%s\n", __func__);
1108
1109         skb = pn533_alloc_skb(dev, 0);
1110         if (!skb)
1111                 return;
1112
1113         rc = pn533_send_cmd_direct_async(dev,
1114                                         PN533_CMD_TG_GET_DATA,
1115                                         skb,
1116                                         pn533_tm_get_data_complete,
1117                                         NULL);
1118
1119         if (rc < 0)
1120                 dev_kfree_skb(skb);
1121 }
1122
1123 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
1124                                   struct sk_buff *resp);
1125 static void pn533_wq_tm_mi_send(struct work_struct *work)
1126 {
1127         struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
1128         struct sk_buff *skb;
1129         int rc;
1130
1131         dev_dbg(dev->dev, "%s\n", __func__);
1132
1133         /* Grab the first skb in the queue */
1134         skb = skb_dequeue(&dev->fragment_skb);
1135         if (skb == NULL) {      /* No more data */
1136                 /* Reset the queue for future use */
1137                 skb_queue_head_init(&dev->fragment_skb);
1138                 goto error;
1139         }
1140
1141         /* last entry - remove MI bit */
1142         if (skb_queue_len(&dev->fragment_skb) == 0) {
1143                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
1144                                         skb, pn533_tm_send_complete, NULL);
1145         } else
1146                 rc = pn533_send_cmd_direct_async(dev,
1147                                         PN533_CMD_TG_SET_META_DATA,
1148                                         skb, pn533_tm_send_complete, NULL);
1149
1150         if (rc == 0) /* success */
1151                 return;
1152
1153         dev_err(dev->dev,
1154                 "Error %d when trying to perform set meta data_exchange", rc);
1155
1156         dev_kfree_skb(skb);
1157
1158 error:
1159         dev->phy_ops->send_ack(dev, GFP_KERNEL);
1160         queue_work(dev->wq, &dev->cmd_work);
1161 }
1162
1163 static void pn533_wq_tg_get_data(struct work_struct *work)
1164 {
1165         struct pn533 *dev = container_of(work, struct pn533, tg_work);
1166         struct sk_buff *skb;
1167         int rc;
1168
1169         dev_dbg(dev->dev, "%s\n", __func__);
1170
1171         skb = pn533_alloc_skb(dev, 0);
1172         if (!skb)
1173                 return;
1174
1175         rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1176                                    pn533_tm_get_data_complete, NULL);
1177
1178         if (rc < 0)
1179                 dev_kfree_skb(skb);
1180 }
1181
1182 #define ATR_REQ_GB_OFFSET 17
1183 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1184 {
1185         u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1186         size_t gb_len;
1187         int rc;
1188
1189         dev_dbg(dev->dev, "%s\n", __func__);
1190
1191         if (resp->len < ATR_REQ_GB_OFFSET + 1)
1192                 return -EINVAL;
1193
1194         mode = resp->data[0];
1195         cmd = &resp->data[1];
1196
1197         dev_dbg(dev->dev, "Target mode 0x%x len %d\n",
1198                 mode, resp->len);
1199
1200         if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1201             PN533_INIT_TARGET_RESP_ACTIVE)
1202                 comm_mode = NFC_COMM_ACTIVE;
1203
1204         if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0)  /* Only DEP supported */
1205                 return -EOPNOTSUPP;
1206
1207         gb = cmd + ATR_REQ_GB_OFFSET;
1208         gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1209
1210         rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1211                               comm_mode, gb, gb_len);
1212         if (rc < 0) {
1213                 nfc_err(dev->dev,
1214                         "Error when signaling target activation\n");
1215                 return rc;
1216         }
1217
1218         dev->tgt_mode = 1;
1219         queue_work(dev->wq, &dev->tg_work);
1220
1221         return 0;
1222 }
1223
1224 static void pn533_listen_mode_timer(unsigned long data)
1225 {
1226         struct pn533 *dev = (struct pn533 *)data;
1227
1228         dev_dbg(dev->dev, "Listen mode timeout\n");
1229
1230         dev->cancel_listen = 1;
1231
1232         pn533_poll_next_mod(dev);
1233
1234         queue_delayed_work(dev->wq, &dev->poll_work,
1235                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1236 }
1237
1238 static int pn533_rf_complete(struct pn533 *dev, void *arg,
1239                              struct sk_buff *resp)
1240 {
1241         int rc = 0;
1242
1243         dev_dbg(dev->dev, "%s\n", __func__);
1244
1245         if (IS_ERR(resp)) {
1246                 rc = PTR_ERR(resp);
1247
1248                 nfc_err(dev->dev, "RF setting error %d\n", rc);
1249
1250                 return rc;
1251         }
1252
1253         queue_delayed_work(dev->wq, &dev->poll_work,
1254                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1255
1256         dev_kfree_skb(resp);
1257         return rc;
1258 }
1259
1260 static void pn533_wq_rf(struct work_struct *work)
1261 {
1262         struct pn533 *dev = container_of(work, struct pn533, rf_work);
1263         struct sk_buff *skb;
1264         int rc;
1265
1266         dev_dbg(dev->dev, "%s\n", __func__);
1267
1268         skb = pn533_alloc_skb(dev, 2);
1269         if (!skb)
1270                 return;
1271
1272         *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD;
1273         *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
1274
1275         rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1276                                   pn533_rf_complete, NULL);
1277         if (rc < 0) {
1278                 dev_kfree_skb(skb);
1279                 nfc_err(dev->dev, "RF setting error %d\n", rc);
1280         }
1281 }
1282
1283 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg,
1284                                    struct sk_buff *resp)
1285 {
1286         struct pn533_cmd_jump_dep_response *rsp;
1287         struct nfc_target nfc_target;
1288         u8 target_gt_len;
1289         int rc;
1290
1291         if (IS_ERR(resp))
1292                 return PTR_ERR(resp);
1293
1294         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1295
1296         rc = rsp->status & PN533_CMD_RET_MASK;
1297         if (rc != PN533_CMD_RET_SUCCESS) {
1298                 /* Not target found, turn radio off */
1299                 queue_work(dev->wq, &dev->rf_work);
1300
1301                 dev_kfree_skb(resp);
1302                 return 0;
1303         }
1304
1305         dev_dbg(dev->dev, "Creating new target");
1306
1307         nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1308         nfc_target.nfcid1_len = 10;
1309         memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1310         rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1311         if (rc)
1312                 goto error;
1313
1314         dev->tgt_available_prots = 0;
1315         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1316
1317         /* ATR_RES general bytes are located at offset 17 */
1318         target_gt_len = resp->len - 17;
1319         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1320                                           rsp->gt, target_gt_len);
1321         if (!rc) {
1322                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1323                                         dev->nfc_dev->targets[0].idx,
1324                                         0, NFC_RF_INITIATOR);
1325
1326                 if (!rc)
1327                         pn533_poll_reset_mod_list(dev);
1328         }
1329 error:
1330         dev_kfree_skb(resp);
1331         return rc;
1332 }
1333
1334 #define PASSIVE_DATA_LEN 5
1335 static int pn533_poll_dep(struct nfc_dev *nfc_dev)
1336 {
1337         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1338         struct sk_buff *skb;
1339         int rc, skb_len;
1340         u8 *next, nfcid3[NFC_NFCID3_MAXSIZE];
1341         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1342
1343         dev_dbg(dev->dev, "%s", __func__);
1344
1345         if (!dev->gb) {
1346                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1347
1348                 if (!dev->gb || !dev->gb_len) {
1349                         dev->poll_dep = 0;
1350                         queue_work(dev->wq, &dev->rf_work);
1351                 }
1352         }
1353
1354         skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1355         skb_len += PASSIVE_DATA_LEN;
1356
1357         /* NFCID3 */
1358         skb_len += NFC_NFCID3_MAXSIZE;
1359         nfcid3[0] = 0x1;
1360         nfcid3[1] = 0xfe;
1361         get_random_bytes(nfcid3 + 2, 6);
1362
1363         skb = pn533_alloc_skb(dev, skb_len);
1364         if (!skb)
1365                 return -ENOMEM;
1366
1367         *skb_put(skb, 1) = 0x01;  /* Active */
1368         *skb_put(skb, 1) = 0x02;  /* 424 kbps */
1369
1370         next = skb_put(skb, 1);  /* Next */
1371         *next = 0;
1372
1373         /* Copy passive data */
1374         memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
1375         *next |= 1;
1376
1377         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1378         memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
1379                NFC_NFCID3_MAXSIZE);
1380         *next |= 2;
1381
1382         memcpy(skb_put(skb, dev->gb_len), dev->gb, dev->gb_len);
1383         *next |= 4; /* We have some Gi */
1384
1385         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1386                                   pn533_poll_dep_complete, NULL);
1387
1388         if (rc < 0)
1389                 dev_kfree_skb(skb);
1390
1391         return rc;
1392 }
1393
1394 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1395                                struct sk_buff *resp)
1396 {
1397         struct pn533_poll_modulations *cur_mod;
1398         int rc;
1399
1400         dev_dbg(dev->dev, "%s\n", __func__);
1401
1402         if (IS_ERR(resp)) {
1403                 rc = PTR_ERR(resp);
1404
1405                 nfc_err(dev->dev, "%s  Poll complete error %d\n",
1406                         __func__, rc);
1407
1408                 if (rc == -ENOENT) {
1409                         if (dev->poll_mod_count != 0)
1410                                 return rc;
1411                         goto stop_poll;
1412                 } else if (rc < 0) {
1413                         nfc_err(dev->dev,
1414                                 "Error %d when running poll\n", rc);
1415                         goto stop_poll;
1416                 }
1417         }
1418
1419         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1420
1421         if (cur_mod->len == 0) { /* Target mode */
1422                 del_timer(&dev->listen_timer);
1423                 rc = pn533_init_target_complete(dev, resp);
1424                 goto done;
1425         }
1426
1427         /* Initiator mode */
1428         rc = pn533_start_poll_complete(dev, resp);
1429         if (!rc)
1430                 goto done;
1431
1432         if (!dev->poll_mod_count) {
1433                 dev_dbg(dev->dev, "Polling has been stopped\n");
1434                 goto done;
1435         }
1436
1437         pn533_poll_next_mod(dev);
1438         /* Not target found, turn radio off */
1439         queue_work(dev->wq, &dev->rf_work);
1440
1441 done:
1442         dev_kfree_skb(resp);
1443         return rc;
1444
1445 stop_poll:
1446         nfc_err(dev->dev, "Polling operation has been stopped\n");
1447
1448         pn533_poll_reset_mod_list(dev);
1449         dev->poll_protocols = 0;
1450         return rc;
1451 }
1452
1453 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1454                                         struct pn533_poll_modulations *mod)
1455 {
1456         struct sk_buff *skb;
1457
1458         skb = pn533_alloc_skb(dev, mod->len);
1459         if (!skb)
1460                 return NULL;
1461
1462         memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
1463
1464         return skb;
1465 }
1466
1467 static int pn533_send_poll_frame(struct pn533 *dev)
1468 {
1469         struct pn533_poll_modulations *mod;
1470         struct sk_buff *skb;
1471         int rc;
1472         u8 cmd_code;
1473
1474         mod = dev->poll_mod_active[dev->poll_mod_curr];
1475
1476         dev_dbg(dev->dev, "%s mod len %d\n",
1477                 __func__, mod->len);
1478
1479         if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep)  {
1480                 dev->poll_dep = 0;
1481                 return pn533_poll_dep(dev->nfc_dev);
1482         }
1483
1484         if (mod->len == 0) {  /* Listen mode */
1485                 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1486                 skb = pn533_alloc_poll_tg_frame(dev);
1487         } else {  /* Polling mode */
1488                 cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
1489                 skb = pn533_alloc_poll_in_frame(dev, mod);
1490         }
1491
1492         if (!skb) {
1493                 nfc_err(dev->dev, "Failed to allocate skb\n");
1494                 return -ENOMEM;
1495         }
1496
1497         rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1498                                   NULL);
1499         if (rc < 0) {
1500                 dev_kfree_skb(skb);
1501                 nfc_err(dev->dev, "Polling loop error %d\n", rc);
1502         }
1503
1504         return rc;
1505 }
1506
1507 static void pn533_wq_poll(struct work_struct *work)
1508 {
1509         struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1510         struct pn533_poll_modulations *cur_mod;
1511         int rc;
1512
1513         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1514
1515         dev_dbg(dev->dev,
1516                 "%s cancel_listen %d modulation len %d\n",
1517                 __func__, dev->cancel_listen, cur_mod->len);
1518
1519         if (dev->cancel_listen == 1) {
1520                 dev->cancel_listen = 0;
1521                 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC);
1522         }
1523
1524         rc = pn533_send_poll_frame(dev);
1525         if (rc)
1526                 return;
1527
1528         if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1529                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1530 }
1531
1532 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1533                             u32 im_protocols, u32 tm_protocols)
1534 {
1535         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1536         struct pn533_poll_modulations *cur_mod;
1537         u8 rand_mod;
1538         int rc;
1539
1540         dev_dbg(dev->dev,
1541                 "%s: im protocols 0x%x tm protocols 0x%x\n",
1542                 __func__, im_protocols, tm_protocols);
1543
1544         if (dev->tgt_active_prot) {
1545                 nfc_err(dev->dev,
1546                         "Cannot poll with a target already activated\n");
1547                 return -EBUSY;
1548         }
1549
1550         if (dev->tgt_mode) {
1551                 nfc_err(dev->dev,
1552                         "Cannot poll while already being activated\n");
1553                 return -EBUSY;
1554         }
1555
1556         if (tm_protocols) {
1557                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1558                 if (dev->gb == NULL)
1559                         tm_protocols = 0;
1560         }
1561
1562         pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1563         dev->poll_protocols = im_protocols;
1564         dev->listen_protocols = tm_protocols;
1565
1566         /* Do not always start polling from the same modulation */
1567         get_random_bytes(&rand_mod, sizeof(rand_mod));
1568         rand_mod %= dev->poll_mod_count;
1569         dev->poll_mod_curr = rand_mod;
1570
1571         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1572
1573         rc = pn533_send_poll_frame(dev);
1574
1575         /* Start listen timer */
1576         if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
1577                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1578
1579         return rc;
1580 }
1581
1582 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1583 {
1584         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1585
1586         del_timer(&dev->listen_timer);
1587
1588         if (!dev->poll_mod_count) {
1589                 dev_dbg(dev->dev,
1590                         "Polling operation was not running\n");
1591                 return;
1592         }
1593
1594         dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1595         flush_delayed_work(&dev->poll_work);
1596         pn533_poll_reset_mod_list(dev);
1597 }
1598
1599 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1600 {
1601         struct pn533_cmd_activate_response *rsp;
1602         u16 gt_len;
1603         int rc;
1604         struct sk_buff *skb;
1605         struct sk_buff *resp;
1606
1607         dev_dbg(dev->dev, "%s\n", __func__);
1608
1609         skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1610         if (!skb)
1611                 return -ENOMEM;
1612
1613         *skb_put(skb, sizeof(u8)) = 1; /* TG */
1614         *skb_put(skb, sizeof(u8)) = 0; /* Next */
1615
1616         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1617         if (IS_ERR(resp))
1618                 return PTR_ERR(resp);
1619
1620         rsp = (struct pn533_cmd_activate_response *)resp->data;
1621         rc = rsp->status & PN533_CMD_RET_MASK;
1622         if (rc != PN533_CMD_RET_SUCCESS) {
1623                 nfc_err(dev->dev,
1624                         "Target activation failed (error 0x%x)\n", rc);
1625                 dev_kfree_skb(resp);
1626                 return -EIO;
1627         }
1628
1629         /* ATR_RES general bytes are located at offset 16 */
1630         gt_len = resp->len - 16;
1631         rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1632
1633         dev_kfree_skb(resp);
1634         return rc;
1635 }
1636
1637 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1638                                  struct nfc_target *target, u32 protocol)
1639 {
1640         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1641         int rc;
1642
1643         dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol);
1644
1645         if (dev->poll_mod_count) {
1646                 nfc_err(dev->dev,
1647                         "Cannot activate while polling\n");
1648                 return -EBUSY;
1649         }
1650
1651         if (dev->tgt_active_prot) {
1652                 nfc_err(dev->dev,
1653                         "There is already an active target\n");
1654                 return -EBUSY;
1655         }
1656
1657         if (!dev->tgt_available_prots) {
1658                 nfc_err(dev->dev,
1659                         "There is no available target to activate\n");
1660                 return -EINVAL;
1661         }
1662
1663         if (!(dev->tgt_available_prots & (1 << protocol))) {
1664                 nfc_err(dev->dev,
1665                         "Target doesn't support requested proto %u\n",
1666                         protocol);
1667                 return -EINVAL;
1668         }
1669
1670         if (protocol == NFC_PROTO_NFC_DEP) {
1671                 rc = pn533_activate_target_nfcdep(dev);
1672                 if (rc) {
1673                         nfc_err(dev->dev,
1674                                 "Activating target with DEP failed %d\n", rc);
1675                         return rc;
1676                 }
1677         }
1678
1679         dev->tgt_active_prot = protocol;
1680         dev->tgt_available_prots = 0;
1681
1682         return 0;
1683 }
1684
1685 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg,
1686                              struct sk_buff *resp)
1687 {
1688         int rc = 0;
1689
1690         dev_dbg(dev->dev, "%s\n", __func__);
1691
1692         if (IS_ERR(resp)) {
1693                 rc = PTR_ERR(resp);
1694
1695                 nfc_err(dev->dev, "Target release error %d\n", rc);
1696
1697                 return rc;
1698         }
1699
1700         rc = resp->data[0] & PN533_CMD_RET_MASK;
1701         if (rc != PN533_CMD_RET_SUCCESS)
1702                 nfc_err(dev->dev,
1703                         "Error 0x%x when releasing the target\n", rc);
1704
1705         dev_kfree_skb(resp);
1706         return rc;
1707 }
1708
1709 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1710                                     struct nfc_target *target, u8 mode)
1711 {
1712         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1713         struct sk_buff *skb;
1714         int rc;
1715
1716         dev_dbg(dev->dev, "%s\n", __func__);
1717
1718         if (!dev->tgt_active_prot) {
1719                 nfc_err(dev->dev, "There is no active target\n");
1720                 return;
1721         }
1722
1723         dev->tgt_active_prot = 0;
1724         skb_queue_purge(&dev->resp_q);
1725
1726         skb = pn533_alloc_skb(dev, sizeof(u8));
1727         if (!skb)
1728                 return;
1729
1730         *skb_put(skb, 1) = 1; /* TG*/
1731
1732         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb,
1733                                   pn533_deactivate_target_complete, NULL);
1734         if (rc < 0) {
1735                 dev_kfree_skb(skb);
1736                 nfc_err(dev->dev, "Target release error %d\n", rc);
1737         }
1738 }
1739
1740
1741 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1742                                          struct sk_buff *resp)
1743 {
1744         struct pn533_cmd_jump_dep_response *rsp;
1745         u8 target_gt_len;
1746         int rc;
1747         u8 active = *(u8 *)arg;
1748
1749         kfree(arg);
1750
1751         if (IS_ERR(resp))
1752                 return PTR_ERR(resp);
1753
1754         if (dev->tgt_available_prots &&
1755             !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1756                 nfc_err(dev->dev,
1757                         "The target does not support DEP\n");
1758                 rc =  -EINVAL;
1759                 goto error;
1760         }
1761
1762         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1763
1764         rc = rsp->status & PN533_CMD_RET_MASK;
1765         if (rc != PN533_CMD_RET_SUCCESS) {
1766                 nfc_err(dev->dev,
1767                         "Bringing DEP link up failed (error 0x%x)\n", rc);
1768                 goto error;
1769         }
1770
1771         if (!dev->tgt_available_prots) {
1772                 struct nfc_target nfc_target;
1773
1774                 dev_dbg(dev->dev, "Creating new target\n");
1775
1776                 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1777                 nfc_target.nfcid1_len = 10;
1778                 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1779                 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1780                 if (rc)
1781                         goto error;
1782
1783                 dev->tgt_available_prots = 0;
1784         }
1785
1786         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1787
1788         /* ATR_RES general bytes are located at offset 17 */
1789         target_gt_len = resp->len - 17;
1790         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1791                                           rsp->gt, target_gt_len);
1792         if (rc == 0)
1793                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1794                                         dev->nfc_dev->targets[0].idx,
1795                                         !active, NFC_RF_INITIATOR);
1796
1797 error:
1798         dev_kfree_skb(resp);
1799         return rc;
1800 }
1801
1802 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
1803 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1804                              u8 comm_mode, u8 *gb, size_t gb_len)
1805 {
1806         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1807         struct sk_buff *skb;
1808         int rc, skb_len;
1809         u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
1810         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1811
1812         dev_dbg(dev->dev, "%s\n", __func__);
1813
1814         if (dev->poll_mod_count) {
1815                 nfc_err(dev->dev,
1816                         "Cannot bring the DEP link up while polling\n");
1817                 return -EBUSY;
1818         }
1819
1820         if (dev->tgt_active_prot) {
1821                 nfc_err(dev->dev,
1822                         "There is already an active target\n");
1823                 return -EBUSY;
1824         }
1825
1826         skb_len = 3 + gb_len; /* ActPass + BR + Next */
1827         skb_len += PASSIVE_DATA_LEN;
1828
1829         /* NFCID3 */
1830         skb_len += NFC_NFCID3_MAXSIZE;
1831         if (target && !target->nfcid2_len) {
1832                 nfcid3[0] = 0x1;
1833                 nfcid3[1] = 0xfe;
1834                 get_random_bytes(nfcid3 + 2, 6);
1835         }
1836
1837         skb = pn533_alloc_skb(dev, skb_len);
1838         if (!skb)
1839                 return -ENOMEM;
1840
1841         *skb_put(skb, 1) = !comm_mode;  /* ActPass */
1842         *skb_put(skb, 1) = 0x02;  /* 424 kbps */
1843
1844         next = skb_put(skb, 1);  /* Next */
1845         *next = 0;
1846
1847         /* Copy passive data */
1848         memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
1849         *next |= 1;
1850
1851         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1852         if (target && target->nfcid2_len)
1853                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
1854                        target->nfcid2_len);
1855         else
1856                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
1857                        NFC_NFCID3_MAXSIZE);
1858         *next |= 2;
1859
1860         if (gb != NULL && gb_len > 0) {
1861                 memcpy(skb_put(skb, gb_len), gb, gb_len);
1862                 *next |= 4; /* We have some Gi */
1863         } else {
1864                 *next = 0;
1865         }
1866
1867         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
1868         if (!arg) {
1869                 dev_kfree_skb(skb);
1870                 return -ENOMEM;
1871         }
1872
1873         *arg = !comm_mode;
1874
1875         pn533_rf_field(dev->nfc_dev, 0);
1876
1877         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1878                                   pn533_in_dep_link_up_complete, arg);
1879
1880         if (rc < 0) {
1881                 dev_kfree_skb(skb);
1882                 kfree(arg);
1883         }
1884
1885         return rc;
1886 }
1887
1888 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
1889 {
1890         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1891
1892         dev_dbg(dev->dev, "%s\n", __func__);
1893
1894         pn533_poll_reset_mod_list(dev);
1895
1896         if (dev->tgt_mode || dev->tgt_active_prot)
1897                 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1898
1899         dev->tgt_active_prot = 0;
1900         dev->tgt_mode = 0;
1901
1902         skb_queue_purge(&dev->resp_q);
1903
1904         return 0;
1905 }
1906
1907 struct pn533_data_exchange_arg {
1908         data_exchange_cb_t cb;
1909         void *cb_context;
1910 };
1911
1912 static struct sk_buff *pn533_build_response(struct pn533 *dev)
1913 {
1914         struct sk_buff *skb, *tmp, *t;
1915         unsigned int skb_len = 0, tmp_len = 0;
1916
1917         dev_dbg(dev->dev, "%s\n", __func__);
1918
1919         if (skb_queue_empty(&dev->resp_q))
1920                 return NULL;
1921
1922         if (skb_queue_len(&dev->resp_q) == 1) {
1923                 skb = skb_dequeue(&dev->resp_q);
1924                 goto out;
1925         }
1926
1927         skb_queue_walk_safe(&dev->resp_q, tmp, t)
1928                 skb_len += tmp->len;
1929
1930         dev_dbg(dev->dev, "%s total length %d\n",
1931                 __func__, skb_len);
1932
1933         skb = alloc_skb(skb_len, GFP_KERNEL);
1934         if (skb == NULL)
1935                 goto out;
1936
1937         skb_put(skb, skb_len);
1938
1939         skb_queue_walk_safe(&dev->resp_q, tmp, t) {
1940                 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
1941                 tmp_len += tmp->len;
1942         }
1943
1944 out:
1945         skb_queue_purge(&dev->resp_q);
1946
1947         return skb;
1948 }
1949
1950 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
1951                                         struct sk_buff *resp)
1952 {
1953         struct pn533_data_exchange_arg *arg = _arg;
1954         struct sk_buff *skb;
1955         int rc = 0;
1956         u8 status, ret, mi;
1957
1958         dev_dbg(dev->dev, "%s\n", __func__);
1959
1960         if (IS_ERR(resp)) {
1961                 rc = PTR_ERR(resp);
1962                 goto _error;
1963         }
1964
1965         status = resp->data[0];
1966         ret = status & PN533_CMD_RET_MASK;
1967         mi = status & PN533_CMD_MI_MASK;
1968
1969         skb_pull(resp, sizeof(status));
1970
1971         if (ret != PN533_CMD_RET_SUCCESS) {
1972                 nfc_err(dev->dev,
1973                         "Exchanging data failed (error 0x%x)\n", ret);
1974                 rc = -EIO;
1975                 goto error;
1976         }
1977
1978         skb_queue_tail(&dev->resp_q, resp);
1979
1980         if (mi) {
1981                 dev->cmd_complete_mi_arg = arg;
1982                 queue_work(dev->wq, &dev->mi_rx_work);
1983                 return -EINPROGRESS;
1984         }
1985
1986         /* Prepare for the next round */
1987         if (skb_queue_len(&dev->fragment_skb) > 0) {
1988                 dev->cmd_complete_dep_arg = arg;
1989                 queue_work(dev->wq, &dev->mi_tx_work);
1990
1991                 return -EINPROGRESS;
1992         }
1993
1994         skb = pn533_build_response(dev);
1995         if (!skb) {
1996                 rc = -ENOMEM;
1997                 goto error;
1998         }
1999
2000         arg->cb(arg->cb_context, skb, 0);
2001         kfree(arg);
2002         return 0;
2003
2004 error:
2005         dev_kfree_skb(resp);
2006 _error:
2007         skb_queue_purge(&dev->resp_q);
2008         arg->cb(arg->cb_context, NULL, rc);
2009         kfree(arg);
2010         return rc;
2011 }
2012
2013 /*
2014  * Receive an incoming pn533 frame. skb contains only header and payload.
2015  * If skb == NULL, it is a notification that the link below is dead.
2016  */
2017 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2018 {
2019         if (!dev->cmd)
2020                 goto sched_wq;
2021
2022         dev->cmd->status = status;
2023
2024         if (status != 0) {
2025                 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2026                 goto sched_wq;
2027         }
2028
2029         if (skb == NULL) {
2030                 pr_err("NULL Frame -> link is dead\n");
2031                 goto sched_wq;
2032         }
2033
2034         if (pn533_rx_frame_is_ack(skb->data)) {
2035                 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2036                 dev_kfree_skb(skb);
2037                 return;
2038         }
2039
2040         print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2041                              dev->ops->rx_frame_size(skb->data), false);
2042
2043         if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2044                 nfc_err(dev->dev, "Received an invalid frame\n");
2045                 dev->cmd->status = -EIO;
2046         } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2047                 nfc_err(dev->dev, "It it not the response to the last command\n");
2048                 dev->cmd->status = -EIO;
2049         }
2050
2051         dev->cmd->resp = skb;
2052
2053 sched_wq:
2054         queue_work(dev->wq, &dev->cmd_complete_work);
2055 }
2056 EXPORT_SYMBOL(pn533_recv_frame);
2057
2058 /* Split the Tx skb into small chunks */
2059 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2060 {
2061         struct sk_buff *frag;
2062         int  frag_size;
2063
2064         do {
2065                 /* Remaining size */
2066                 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2067                         frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2068                 else
2069                         frag_size = skb->len;
2070
2071                 /* Allocate and reserve */
2072                 frag = pn533_alloc_skb(dev, frag_size);
2073                 if (!frag) {
2074                         skb_queue_purge(&dev->fragment_skb);
2075                         break;
2076                 }
2077
2078                 if (!dev->tgt_mode) {
2079                         /* Reserve the TG/MI byte */
2080                         skb_reserve(frag, 1);
2081
2082                         /* MI + TG */
2083                         if (frag_size  == PN533_CMD_DATAFRAME_MAXLEN)
2084                                 *skb_push(frag, sizeof(u8)) =
2085                                                         (PN533_CMD_MI_MASK | 1);
2086                         else
2087                                 *skb_push(frag, sizeof(u8)) =  1; /* TG */
2088                 }
2089
2090                 memcpy(skb_put(frag, frag_size), skb->data, frag_size);
2091
2092                 /* Reduce the size of incoming buffer */
2093                 skb_pull(skb, frag_size);
2094
2095                 /* Add this to skb_queue */
2096                 skb_queue_tail(&dev->fragment_skb, frag);
2097
2098         } while (skb->len > 0);
2099
2100         dev_kfree_skb(skb);
2101
2102         return skb_queue_len(&dev->fragment_skb);
2103 }
2104
2105 static int pn533_transceive(struct nfc_dev *nfc_dev,
2106                             struct nfc_target *target, struct sk_buff *skb,
2107                             data_exchange_cb_t cb, void *cb_context)
2108 {
2109         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2110         struct pn533_data_exchange_arg *arg = NULL;
2111         int rc;
2112
2113         dev_dbg(dev->dev, "%s\n", __func__);
2114
2115         if (!dev->tgt_active_prot) {
2116                 nfc_err(dev->dev,
2117                         "Can't exchange data if there is no active target\n");
2118                 rc = -EINVAL;
2119                 goto error;
2120         }
2121
2122         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2123         if (!arg) {
2124                 rc = -ENOMEM;
2125                 goto error;
2126         }
2127
2128         arg->cb = cb;
2129         arg->cb_context = cb_context;
2130
2131         switch (dev->device_type) {
2132         case PN533_DEVICE_PASORI:
2133                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2134                         rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2135                                                    skb,
2136                                                    pn533_data_exchange_complete,
2137                                                    arg);
2138
2139                         break;
2140                 }
2141         default:
2142                 /* jumbo frame ? */
2143                 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2144                         rc = pn533_fill_fragment_skbs(dev, skb);
2145                         if (rc <= 0)
2146                                 goto error;
2147
2148                         skb = skb_dequeue(&dev->fragment_skb);
2149                         if (!skb) {
2150                                 rc = -EIO;
2151                                 goto error;
2152                         }
2153                 } else {
2154                         *skb_push(skb, sizeof(u8)) =  1; /* TG */
2155                 }
2156
2157                 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2158                                            skb, pn533_data_exchange_complete,
2159                                            arg);
2160
2161                 break;
2162         }
2163
2164         if (rc < 0) /* rc from send_async */
2165                 goto error;
2166
2167         return 0;
2168
2169 error:
2170         kfree(arg);
2171         dev_kfree_skb(skb);
2172         return rc;
2173 }
2174
2175 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2176                                   struct sk_buff *resp)
2177 {
2178         u8 status;
2179
2180         dev_dbg(dev->dev, "%s\n", __func__);
2181
2182         if (IS_ERR(resp))
2183                 return PTR_ERR(resp);
2184
2185         status = resp->data[0];
2186
2187         /* Prepare for the next round */
2188         if (skb_queue_len(&dev->fragment_skb) > 0) {
2189                 queue_work(dev->wq, &dev->mi_tm_tx_work);
2190                 return -EINPROGRESS;
2191         }
2192         dev_kfree_skb(resp);
2193
2194         if (status != 0) {
2195                 nfc_tm_deactivated(dev->nfc_dev);
2196
2197                 dev->tgt_mode = 0;
2198
2199                 return 0;
2200         }
2201
2202         queue_work(dev->wq, &dev->tg_work);
2203
2204         return 0;
2205 }
2206
2207 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2208 {
2209         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2210         int rc;
2211
2212         dev_dbg(dev->dev, "%s\n", __func__);
2213
2214         /* let's split in multiple chunks if size's too big */
2215         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2216                 rc = pn533_fill_fragment_skbs(dev, skb);
2217                 if (rc <= 0)
2218                         goto error;
2219
2220                 /* get the first skb */
2221                 skb = skb_dequeue(&dev->fragment_skb);
2222                 if (!skb) {
2223                         rc = -EIO;
2224                         goto error;
2225                 }
2226
2227                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2228                                                 pn533_tm_send_complete, NULL);
2229         } else {
2230                 /* Send th skb */
2231                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2232                                                 pn533_tm_send_complete, NULL);
2233         }
2234
2235 error:
2236         if (rc < 0) {
2237                 dev_kfree_skb(skb);
2238                 skb_queue_purge(&dev->fragment_skb);
2239         }
2240
2241         return rc;
2242 }
2243
2244 static void pn533_wq_mi_recv(struct work_struct *work)
2245 {
2246         struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2247         struct sk_buff *skb;
2248         int rc;
2249
2250         dev_dbg(dev->dev, "%s\n", __func__);
2251
2252         skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2253         if (!skb)
2254                 goto error;
2255
2256         switch (dev->device_type) {
2257         case PN533_DEVICE_PASORI:
2258                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2259                         rc = pn533_send_cmd_direct_async(dev,
2260                                                 PN533_CMD_IN_COMM_THRU,
2261                                                 skb,
2262                                                 pn533_data_exchange_complete,
2263                                                  dev->cmd_complete_mi_arg);
2264
2265                         break;
2266                 }
2267         default:
2268                 *skb_put(skb, sizeof(u8)) =  1; /*TG*/
2269
2270                 rc = pn533_send_cmd_direct_async(dev,
2271                                                  PN533_CMD_IN_DATA_EXCHANGE,
2272                                                  skb,
2273                                                  pn533_data_exchange_complete,
2274                                                  dev->cmd_complete_mi_arg);
2275
2276                 break;
2277         }
2278
2279         if (rc == 0) /* success */
2280                 return;
2281
2282         nfc_err(dev->dev,
2283                 "Error %d when trying to perform data_exchange\n", rc);
2284
2285         dev_kfree_skb(skb);
2286         kfree(dev->cmd_complete_mi_arg);
2287
2288 error:
2289         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2290         queue_work(dev->wq, &dev->cmd_work);
2291 }
2292
2293 static void pn533_wq_mi_send(struct work_struct *work)
2294 {
2295         struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2296         struct sk_buff *skb;
2297         int rc;
2298
2299         dev_dbg(dev->dev, "%s\n", __func__);
2300
2301         /* Grab the first skb in the queue */
2302         skb = skb_dequeue(&dev->fragment_skb);
2303
2304         if (skb == NULL) {      /* No more data */
2305                 /* Reset the queue for future use */
2306                 skb_queue_head_init(&dev->fragment_skb);
2307                 goto error;
2308         }
2309
2310         switch (dev->device_type) {
2311         case PN533_DEVICE_PASORI:
2312                 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2313                         rc = -EIO;
2314                         break;
2315                 }
2316
2317                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2318                                                  skb,
2319                                                  pn533_data_exchange_complete,
2320                                                  dev->cmd_complete_dep_arg);
2321
2322                 break;
2323
2324         default:
2325                 /* Still some fragments? */
2326                 rc = pn533_send_cmd_direct_async(dev,
2327                                                  PN533_CMD_IN_DATA_EXCHANGE,
2328                                                  skb,
2329                                                  pn533_data_exchange_complete,
2330                                                  dev->cmd_complete_dep_arg);
2331
2332                 break;
2333         }
2334
2335         if (rc == 0) /* success */
2336                 return;
2337
2338         nfc_err(dev->dev,
2339                 "Error %d when trying to perform data_exchange\n", rc);
2340
2341         dev_kfree_skb(skb);
2342         kfree(dev->cmd_complete_dep_arg);
2343
2344 error:
2345         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2346         queue_work(dev->wq, &dev->cmd_work);
2347 }
2348
2349 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2350                                                                 u8 cfgdata_len)
2351 {
2352         struct sk_buff *skb;
2353         struct sk_buff *resp;
2354         int skb_len;
2355
2356         dev_dbg(dev->dev, "%s\n", __func__);
2357
2358         skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2359
2360         skb = pn533_alloc_skb(dev, skb_len);
2361         if (!skb)
2362                 return -ENOMEM;
2363
2364         *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2365         memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2366
2367         resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2368         if (IS_ERR(resp))
2369                 return PTR_ERR(resp);
2370
2371         dev_kfree_skb(resp);
2372         return 0;
2373 }
2374
2375 static int pn533_get_firmware_version(struct pn533 *dev,
2376                                       struct pn533_fw_version *fv)
2377 {
2378         struct sk_buff *skb;
2379         struct sk_buff *resp;
2380
2381         skb = pn533_alloc_skb(dev, 0);
2382         if (!skb)
2383                 return -ENOMEM;
2384
2385         resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2386         if (IS_ERR(resp))
2387                 return PTR_ERR(resp);
2388
2389         fv->ic = resp->data[0];
2390         fv->ver = resp->data[1];
2391         fv->rev = resp->data[2];
2392         fv->support = resp->data[3];
2393
2394         dev_kfree_skb(resp);
2395         return 0;
2396 }
2397
2398 static int pn533_pasori_fw_reset(struct pn533 *dev)
2399 {
2400         struct sk_buff *skb;
2401         struct sk_buff *resp;
2402
2403         dev_dbg(dev->dev, "%s\n", __func__);
2404
2405         skb = pn533_alloc_skb(dev, sizeof(u8));
2406         if (!skb)
2407                 return -ENOMEM;
2408
2409         *skb_put(skb, sizeof(u8)) = 0x1;
2410
2411         resp = pn533_send_cmd_sync(dev, 0x18, skb);
2412         if (IS_ERR(resp))
2413                 return PTR_ERR(resp);
2414
2415         dev_kfree_skb(resp);
2416
2417         return 0;
2418 }
2419
2420 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2421 {
2422         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2423         u8 rf_field = !!rf;
2424         int rc;
2425
2426         rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2427
2428         rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2429                                      (u8 *)&rf_field, 1);
2430         if (rc) {
2431                 nfc_err(dev->dev, "Error on setting RF field\n");
2432                 return rc;
2433         }
2434
2435         return rc;
2436 }
2437
2438 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2439 {
2440         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2441         struct sk_buff *skb;
2442         struct sk_buff *resp;
2443
2444         skb = pn533_alloc_skb(dev, 1);
2445         if (!skb)
2446                 return -ENOMEM;
2447
2448         *skb_put(skb, 1) = 0x01;
2449
2450         resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2451         if (IS_ERR(resp))
2452                 return PTR_ERR(resp);
2453
2454         dev_kfree_skb(resp);
2455         return 0;
2456 }
2457
2458 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2459 {
2460         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2461
2462         if (dev->device_type == PN533_DEVICE_PN532) {
2463                 int rc = pn532_sam_configuration(nfc_dev);
2464
2465                 if (rc)
2466                         return rc;
2467         }
2468
2469         return pn533_rf_field(nfc_dev, 1);
2470 }
2471
2472 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2473 {
2474         return pn533_rf_field(nfc_dev, 0);
2475 }
2476
2477 static struct nfc_ops pn533_nfc_ops = {
2478         .dev_up = pn533_dev_up,
2479         .dev_down = pn533_dev_down,
2480         .dep_link_up = pn533_dep_link_up,
2481         .dep_link_down = pn533_dep_link_down,
2482         .start_poll = pn533_start_poll,
2483         .stop_poll = pn533_stop_poll,
2484         .activate_target = pn533_activate_target,
2485         .deactivate_target = pn533_deactivate_target,
2486         .im_transceive = pn533_transceive,
2487         .tm_send = pn533_tm_send,
2488 };
2489
2490 static int pn533_setup(struct pn533 *dev)
2491 {
2492         struct pn533_config_max_retries max_retries;
2493         struct pn533_config_timing timing;
2494         u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2495         int rc;
2496
2497         switch (dev->device_type) {
2498         case PN533_DEVICE_STD:
2499         case PN533_DEVICE_PASORI:
2500         case PN533_DEVICE_ACR122U:
2501         case PN533_DEVICE_PN532:
2502                 max_retries.mx_rty_atr = 0x2;
2503                 max_retries.mx_rty_psl = 0x1;
2504                 max_retries.mx_rty_passive_act =
2505                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2506
2507                 timing.rfu = PN533_CONFIG_TIMING_102;
2508                 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2509                 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2510
2511                 break;
2512
2513         default:
2514                 nfc_err(dev->dev, "Unknown device type %d\n",
2515                         dev->device_type);
2516                 return -EINVAL;
2517         }
2518
2519         rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2520                                      (u8 *)&max_retries, sizeof(max_retries));
2521         if (rc) {
2522                 nfc_err(dev->dev,
2523                         "Error on setting MAX_RETRIES config\n");
2524                 return rc;
2525         }
2526
2527
2528         rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2529                                      (u8 *)&timing, sizeof(timing));
2530         if (rc) {
2531                 nfc_err(dev->dev, "Error on setting RF timings\n");
2532                 return rc;
2533         }
2534
2535         switch (dev->device_type) {
2536         case PN533_DEVICE_STD:
2537         case PN533_DEVICE_PN532:
2538                 break;
2539
2540         case PN533_DEVICE_PASORI:
2541                 pn533_pasori_fw_reset(dev);
2542
2543                 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2544                                              pasori_cfg, 3);
2545                 if (rc) {
2546                         nfc_err(dev->dev,
2547                                 "Error while settings PASORI config\n");
2548                         return rc;
2549                 }
2550
2551                 pn533_pasori_fw_reset(dev);
2552
2553                 break;
2554         }
2555
2556         return 0;
2557 }
2558
2559 struct pn533 *pn533_register_device(u32 device_type,
2560                                 u32 protocols,
2561                                 enum pn533_protocol_type protocol_type,
2562                                 void *phy,
2563                                 struct pn533_phy_ops *phy_ops,
2564                                 struct pn533_frame_ops *fops,
2565                                 struct device *dev,
2566                                 struct device *parent)
2567 {
2568         struct pn533_fw_version fw_ver;
2569         struct pn533 *priv;
2570         int rc = -ENOMEM;
2571
2572         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2573         if (!priv)
2574                 return ERR_PTR(-ENOMEM);
2575
2576         priv->phy = phy;
2577         priv->phy_ops = phy_ops;
2578         priv->dev = dev;
2579         if (fops != NULL)
2580                 priv->ops = fops;
2581         else
2582                 priv->ops = &pn533_std_frame_ops;
2583
2584         priv->protocol_type = protocol_type;
2585         priv->device_type = device_type;
2586
2587         mutex_init(&priv->cmd_lock);
2588
2589         INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2590         INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2591         INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2592         INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2593         INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2594         INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2595         INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2596         INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2597         INIT_WORK(&priv->rf_work, pn533_wq_rf);
2598         priv->wq = alloc_ordered_workqueue("pn533", 0);
2599         if (priv->wq == NULL)
2600                 goto error;
2601
2602         init_timer(&priv->listen_timer);
2603         priv->listen_timer.data = (unsigned long) priv;
2604         priv->listen_timer.function = pn533_listen_mode_timer;
2605
2606         skb_queue_head_init(&priv->resp_q);
2607         skb_queue_head_init(&priv->fragment_skb);
2608
2609         INIT_LIST_HEAD(&priv->cmd_queue);
2610
2611         memset(&fw_ver, 0, sizeof(fw_ver));
2612         rc = pn533_get_firmware_version(priv, &fw_ver);
2613         if (rc < 0)
2614                 goto destroy_wq;
2615
2616         nfc_info(dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2617                  fw_ver.ic, fw_ver.ver, fw_ver.rev);
2618
2619
2620         priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2621                                            priv->ops->tx_header_len +
2622                                            PN533_CMD_DATAEXCH_HEAD_LEN,
2623                                            priv->ops->tx_tail_len);
2624         if (!priv->nfc_dev) {
2625                 rc = -ENOMEM;
2626                 goto destroy_wq;
2627         }
2628
2629         nfc_set_parent_dev(priv->nfc_dev, parent);
2630         nfc_set_drvdata(priv->nfc_dev, priv);
2631
2632         rc = nfc_register_device(priv->nfc_dev);
2633         if (rc)
2634                 goto free_nfc_dev;
2635
2636         rc = pn533_setup(priv);
2637         if (rc)
2638                 goto unregister_nfc_dev;
2639
2640         return priv;
2641
2642 unregister_nfc_dev:
2643         nfc_unregister_device(priv->nfc_dev);
2644
2645 free_nfc_dev:
2646         nfc_free_device(priv->nfc_dev);
2647
2648 destroy_wq:
2649         destroy_workqueue(priv->wq);
2650 error:
2651         kfree(priv);
2652         return ERR_PTR(rc);
2653 }
2654 EXPORT_SYMBOL_GPL(pn533_register_device);
2655
2656 void pn533_unregister_device(struct pn533 *priv)
2657 {
2658         struct pn533_cmd *cmd, *n;
2659
2660         nfc_unregister_device(priv->nfc_dev);
2661         nfc_free_device(priv->nfc_dev);
2662
2663         flush_delayed_work(&priv->poll_work);
2664         destroy_workqueue(priv->wq);
2665
2666         skb_queue_purge(&priv->resp_q);
2667
2668         del_timer(&priv->listen_timer);
2669
2670         list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2671                 list_del(&cmd->queue);
2672                 kfree(cmd);
2673         }
2674
2675         kfree(priv);
2676 }
2677 EXPORT_SYMBOL_GPL(pn533_unregister_device);
2678
2679
2680 MODULE_AUTHOR("Lauro Ramos Venancio <[email protected]>");
2681 MODULE_AUTHOR("Aloisio Almeida Jr <[email protected]>");
2682 MODULE_AUTHOR("Waldemar Rymarkiewicz <[email protected]>");
2683 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2684 MODULE_VERSION(VERSION);
2685 MODULE_LICENSE("GPL");