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         struct sk_buff *resp;
 387         int status, rc = 0;
 388
 389         if (!cmd) {
 390                 dev_dbg(dev->dev, "%s: cmd not set\n", __func__);
 391                 goto done;
 392         }
 393
 394         dev_kfree_skb(cmd->req);
 395
 396         status = cmd->status;
 397         resp = cmd->resp;
 398
 399         if (status < 0) {
 400                 rc = cmd->complete_cb(dev, cmd->complete_cb_context,
 401                                       ERR_PTR(status));
 402                 dev_kfree_skb(resp);
 403                 goto done;
 404         }
 405
 406         /* when no response is set we got interrupted */
 407         if (!resp)
 408                 resp = ERR_PTR(-EINTR);
 409
 410         if (!IS_ERR(resp)) {
 411                 skb_pull(resp, dev->ops->rx_header_len);
 412                 skb_trim(resp, resp->len - dev->ops->rx_tail_len);
 413         }
 414
 415         rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp);
 416
 417 done:
 418         kfree(cmd);
 419         dev->cmd = NULL;
 420         return rc;
 421 }
 422
 423 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
 424                               struct sk_buff *req,
 425                               pn533_send_async_complete_t complete_cb,
 426                               void *complete_cb_context)
 427 {
 428         struct pn533_cmd *cmd;
 429         int rc = 0;
 430
 431         dev_dbg(dev->dev, "Sending command 0x%x\n", cmd_code);
 432
 433         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 434         if (!cmd)
 435                 return -ENOMEM;
 436
 437         cmd->code = cmd_code;
 438         cmd->req = req;
 439         cmd->complete_cb = complete_cb;
 440         cmd->complete_cb_context = complete_cb_context;
 441
 442         pn533_build_cmd_frame(dev, cmd_code, req);
 443
 444         mutex_lock(&dev->cmd_lock);
 445
 446         if (!dev->cmd_pending) {
 447                 dev->cmd = cmd;
 448                 rc = dev->phy_ops->send_frame(dev, req);
 449                 if (rc) {
 450                         dev->cmd = NULL;
 451                         goto error;
 452                 }
 453
 454                 dev->cmd_pending = 1;
 455                 goto unlock;
 456         }
 457
 458         dev_dbg(dev->dev, "%s Queueing command 0x%x\n",
 459                 __func__, cmd_code);
 460
 461         INIT_LIST_HEAD(&cmd->queue);
 462         list_add_tail(&cmd->queue, &dev->cmd_queue);
 463
 464         goto unlock;
 465
 466 error:
 467         kfree(cmd);
 468 unlock:
 469         mutex_unlock(&dev->cmd_lock);
 470         return rc;
 471 }
 472
 473 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
 474                                  struct sk_buff *req,
 475                                  pn533_send_async_complete_t complete_cb,
 476                                  void *complete_cb_context)
 477 {
 478         int rc;
 479
 480         rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
 481                                 complete_cb_context);
 482
 483         return rc;
 484 }
 485
 486 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
 487                                 struct sk_buff *req,
 488                                 pn533_send_async_complete_t complete_cb,
 489                                 void *complete_cb_context)
 490 {
 491         int rc;
 492
 493         rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
 494                                 complete_cb_context);
 495
 496         return rc;
 497 }
 498
 499 /*
 500  * pn533_send_cmd_direct_async
 501  *
 502  * The function sends a piority cmd directly to the chip omitting the cmd
 503  * queue. It's intended to be used by chaining mechanism of received responses
 504  * where the host has to request every single chunk of data before scheduling
 505  * next cmd from the queue.
 506  */
 507 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
 508                                        struct sk_buff *req,
 509                                        pn533_send_async_complete_t complete_cb,
 510                                        void *complete_cb_context)
 511 {
 512         struct pn533_cmd *cmd;
 513         int rc;
 514
 515         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 516         if (!cmd)
 517                 return -ENOMEM;
 518
 519         cmd->code = cmd_code;
 520         cmd->req = req;
 521         cmd->complete_cb = complete_cb;
 522         cmd->complete_cb_context = complete_cb_context;
 523
 524         pn533_build_cmd_frame(dev, cmd_code, req);
 525
 526         dev->cmd = cmd;
 527         rc = dev->phy_ops->send_frame(dev, req);
 528         if (rc < 0) {
 529                 dev->cmd = NULL;
 530                 kfree(cmd);
 531         }
 532
 533         return rc;
 534 }
 535
 536 static void pn533_wq_cmd_complete(struct work_struct *work)
 537 {
 538         struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
 539         int rc;
 540
 541         rc = pn533_send_async_complete(dev);
 542         if (rc != -EINPROGRESS)
 543                 queue_work(dev->wq, &dev->cmd_work);
 544 }
 545
 546 static void pn533_wq_cmd(struct work_struct *work)
 547 {
 548         struct pn533 *dev = container_of(work, struct pn533, cmd_work);
 549         struct pn533_cmd *cmd;
 550         int rc;
 551
 552         mutex_lock(&dev->cmd_lock);
 553
 554         if (list_empty(&dev->cmd_queue)) {
 555                 dev->cmd_pending = 0;
 556                 mutex_unlock(&dev->cmd_lock);
 557                 return;
 558         }
 559
 560         cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
 561
 562         list_del(&cmd->queue);
 563
 564         mutex_unlock(&dev->cmd_lock);
 565
 566         dev->cmd = cmd;
 567         rc = dev->phy_ops->send_frame(dev, cmd->req);
 568         if (rc < 0) {
 569                 dev->cmd = NULL;
 570                 dev_kfree_skb(cmd->req);
 571                 kfree(cmd);
 572                 return;
 573         }
 574
 575 }
 576
 577 struct pn533_sync_cmd_response {
 578         struct sk_buff *resp;
 579         struct completion done;
 580 };
 581
 582 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
 583                                     struct sk_buff *resp)
 584 {
 585         struct pn533_sync_cmd_response *arg = _arg;
 586
 587         arg->resp = resp;
 588         complete(&arg->done);
 589
 590         return 0;
 591 }
 592
 593 /*  pn533_send_cmd_sync
 594  *
 595  *  Please note the req parameter is freed inside the function to
 596  *  limit a number of return value interpretations by the caller.
 597  *
 598  *  1. negative in case of error during TX path -> req should be freed
 599  *
 600  *  2. negative in case of error during RX path -> req should not be freed
 601  *     as it's been already freed at the beginning of RX path by
 602  *     async_complete_cb.
 603  *
 604  *  3. valid pointer in case of succesfult RX path
 605  *
 606  *  A caller has to check a return value with IS_ERR macro. If the test pass,
 607  *  the returned pointer is valid.
 608  *
 609  */
 610 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
 611                                                struct sk_buff *req)
 612 {
 613         int rc;
 614         struct pn533_sync_cmd_response arg;
 615
 616         init_completion(&arg.done);
 617
 618         rc = pn533_send_cmd_async(dev, cmd_code, req,
 619                                   pn533_send_sync_complete, &arg);
 620         if (rc) {
 621                 dev_kfree_skb(req);
 622                 return ERR_PTR(rc);
 623         }
 624
 625         wait_for_completion(&arg.done);
 626
 627         return arg.resp;
 628 }
 629
 630 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
 631 {
 632         struct sk_buff *skb;
 633
 634         skb = alloc_skb(dev->ops->tx_header_len +
 635                         size +
 636                         dev->ops->tx_tail_len, GFP_KERNEL);
 637
 638         if (skb)
 639                 skb_reserve(skb, dev->ops->tx_header_len);
 640
 641         return skb;
 642 }
 643
 644 struct pn533_target_type_a {
 645         __be16 sens_res;
 646         u8 sel_res;
 647         u8 nfcid_len;
 648         u8 nfcid_data[];
 649 } __packed;
 650
 651
 652 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
 653 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
 654 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
 655
 656 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
 657 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
 658
 659 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
 660 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
 661
 662 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
 663 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
 664 #define PN533_TYPE_A_SEL_PROT_DEP 2
 665 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
 666
 667 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
 668                                                         int target_data_len)
 669 {
 670         u8 ssd;
 671         u8 platconf;
 672
 673         if (target_data_len < sizeof(struct pn533_target_type_a))
 674                 return false;
 675
 676         /*
 677          * The length check of nfcid[] and ats[] are not being performed because
 678          * the values are not being used
 679          */
 680
 681         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
 682         ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
 683         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
 684
 685         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 686              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
 687             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 688              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
 689                 return false;
 690
 691         /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
 692         if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
 693                 return false;
 694
 695         return true;
 696 }
 697
 698 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
 699                                                         int tgt_data_len)
 700 {
 701         struct pn533_target_type_a *tgt_type_a;
 702
 703         tgt_type_a = (struct pn533_target_type_a *)tgt_data;
 704
 705         if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
 706                 return -EPROTO;
 707
 708         switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
 709         case PN533_TYPE_A_SEL_PROT_MIFARE:
 710                 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
 711                 break;
 712         case PN533_TYPE_A_SEL_PROT_ISO14443:
 713                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
 714                 break;
 715         case PN533_TYPE_A_SEL_PROT_DEP:
 716                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 717                 break;
 718         case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
 719                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
 720                                                         NFC_PROTO_NFC_DEP_MASK;
 721                 break;
 722         }
 723
 724         nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
 725         nfc_tgt->sel_res = tgt_type_a->sel_res;
 726         nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
 727         memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
 728
 729         return 0;
 730 }
 731
 732 struct pn533_target_felica {
 733         u8 pol_res;
 734         u8 opcode;
 735         u8 nfcid2[NFC_NFCID2_MAXSIZE];
 736         u8 pad[8];
 737         /* optional */
 738         u8 syst_code[];
 739 } __packed;
 740
 741 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
 742 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
 743
 744 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
 745                                                         int target_data_len)
 746 {
 747         if (target_data_len < sizeof(struct pn533_target_felica))
 748                 return false;
 749
 750         if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
 751                 return false;
 752
 753         return true;
 754 }
 755
 756 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
 757                                                         int tgt_data_len)
 758 {
 759         struct pn533_target_felica *tgt_felica;
 760
 761         tgt_felica = (struct pn533_target_felica *)tgt_data;
 762
 763         if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
 764                 return -EPROTO;
 765
 766         if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
 767             (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
 768                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 769         else
 770                 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
 771
 772         memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
 773         nfc_tgt->sensf_res_len = 9;
 774
 775         memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
 776         nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
 777
 778         return 0;
 779 }
 780
 781 struct pn533_target_jewel {
 782         __be16 sens_res;
 783         u8 jewelid[4];
 784 } __packed;
 785
 786 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
 787                                                         int target_data_len)
 788 {
 789         u8 ssd;
 790         u8 platconf;
 791
 792         if (target_data_len < sizeof(struct pn533_target_jewel))
 793                 return false;
 794
 795         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
 796         ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
 797         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
 798
 799         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 800              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
 801             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 802              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
 803                 return false;
 804
 805         return true;
 806 }
 807
 808 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
 809                                                         int tgt_data_len)
 810 {
 811         struct pn533_target_jewel *tgt_jewel;
 812
 813         tgt_jewel = (struct pn533_target_jewel *)tgt_data;
 814
 815         if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
 816                 return -EPROTO;
 817
 818         nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
 819         nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
 820         nfc_tgt->nfcid1_len = 4;
 821         memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
 822
 823         return 0;
 824 }
 825
 826 struct pn533_type_b_prot_info {
 827         u8 bitrate;
 828         u8 fsci_type;
 829         u8 fwi_adc_fo;
 830 } __packed;
 831
 832 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
 833 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
 834 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
 835
 836 struct pn533_type_b_sens_res {
 837         u8 opcode;
 838         u8 nfcid[4];
 839         u8 appdata[4];
 840         struct pn533_type_b_prot_info prot_info;
 841 } __packed;
 842
 843 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
 844
 845 struct pn533_target_type_b {
 846         struct pn533_type_b_sens_res sensb_res;
 847         u8 attrib_res_len;
 848         u8 attrib_res[];
 849 } __packed;
 850
 851 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
 852                                                         int target_data_len)
 853 {
 854         if (target_data_len < sizeof(struct pn533_target_type_b))
 855                 return false;
 856
 857         if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
 858                 return false;
 859
 860         if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
 861                                                 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
 862                 return false;
 863
 864         return true;
 865 }
 866
 867 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
 868                                                         int tgt_data_len)
 869 {
 870         struct pn533_target_type_b *tgt_type_b;
 871
 872         tgt_type_b = (struct pn533_target_type_b *)tgt_data;
 873
 874         if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
 875                 return -EPROTO;
 876
 877         nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
 878
 879         return 0;
 880 }
 881
 882 static void pn533_poll_reset_mod_list(struct pn533 *dev);
 883 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
 884                               int tgdata_len)
 885 {
 886         struct nfc_target nfc_tgt;
 887         int rc;
 888
 889         dev_dbg(dev->dev, "%s: modulation=%d\n",
 890                 __func__, dev->poll_mod_curr);
 891
 892         if (tg != 1)
 893                 return -EPROTO;
 894
 895         memset(&nfc_tgt, 0, sizeof(struct nfc_target));
 896
 897         switch (dev->poll_mod_curr) {
 898         case PN533_POLL_MOD_106KBPS_A:
 899                 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
 900                 break;
 901         case PN533_POLL_MOD_212KBPS_FELICA:
 902         case PN533_POLL_MOD_424KBPS_FELICA:
 903                 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
 904                 break;
 905         case PN533_POLL_MOD_106KBPS_JEWEL:
 906                 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
 907                 break;
 908         case PN533_POLL_MOD_847KBPS_B:
 909                 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
 910                 break;
 911         default:
 912                 nfc_err(dev->dev,
 913                         "Unknown current poll modulation\n");
 914                 return -EPROTO;
 915         }
 916
 917         if (rc)
 918                 return rc;
 919
 920         if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
 921                 dev_dbg(dev->dev,
 922                         "The Tg found doesn't have the desired protocol\n");
 923                 return -EAGAIN;
 924         }
 925
 926         dev_dbg(dev->dev,
 927                 "Target found - supported protocols: 0x%x\n",
 928                 nfc_tgt.supported_protocols);
 929
 930         dev->tgt_available_prots = nfc_tgt.supported_protocols;
 931
 932         pn533_poll_reset_mod_list(dev);
 933         nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
 934
 935         return 0;
 936 }
 937
 938 static inline void pn533_poll_next_mod(struct pn533 *dev)
 939 {
 940         dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
 941 }
 942
 943 static void pn533_poll_reset_mod_list(struct pn533 *dev)
 944 {
 945         dev->poll_mod_count = 0;
 946 }
 947
 948 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
 949 {
 950         dev->poll_mod_active[dev->poll_mod_count] =
 951                 (struct pn533_poll_modulations *)&poll_mod[mod_index];
 952         dev->poll_mod_count++;
 953 }
 954
 955 static void pn533_poll_create_mod_list(struct pn533 *dev,
 956                                        u32 im_protocols, u32 tm_protocols)
 957 {
 958         pn533_poll_reset_mod_list(dev);
 959
 960         if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
 961             (im_protocols & NFC_PROTO_ISO14443_MASK) ||
 962             (im_protocols & NFC_PROTO_NFC_DEP_MASK))
 963                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
 964
 965         if (im_protocols & NFC_PROTO_FELICA_MASK ||
 966             im_protocols & NFC_PROTO_NFC_DEP_MASK) {
 967                 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
 968                 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
 969         }
 970
 971         if (im_protocols & NFC_PROTO_JEWEL_MASK)
 972                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
 973
 974         if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
 975                 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
 976
 977         if (tm_protocols)
 978                 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
 979 }
 980
 981 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
 982 {
 983         u8 nbtg, tg, *tgdata;
 984         int rc, tgdata_len;
 985
 986         /* Toggle the DEP polling */
 987         if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK)
 988                 dev->poll_dep = 1;
 989
 990         nbtg = resp->data[0];
 991         tg = resp->data[1];
 992         tgdata = &resp->data[2];
 993         tgdata_len = resp->len - 2;  /* nbtg + tg */
 994
 995         if (nbtg) {
 996                 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
 997
 998                 /* We must stop the poll after a valid target found */
 999                 if (rc == 0)
1000                         return 0;
1001         }
1002
1003         return -EAGAIN;
1004 }
1005
1006 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1007 {
1008         struct sk_buff *skb;
1009         u8 *felica, *nfcid3;
1010
1011         u8 *gbytes = dev->gb;
1012         size_t gbytes_len = dev->gb_len;
1013
1014         u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1015                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1016                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1017                                 0xff, 0xff}; /* System code */
1018
1019         u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1020                                0x0, 0x0, 0x0,
1021                                0x40}; /* SEL_RES for DEP */
1022
1023         unsigned int skb_len = 36 + /*
1024                                      * mode (1), mifare (6),
1025                                      * felica (18), nfcid3 (10), gb_len (1)
1026                                      */
1027                                gbytes_len +
1028                                1;  /* len Tk*/
1029
1030         skb = pn533_alloc_skb(dev, skb_len);
1031         if (!skb)
1032                 return NULL;
1033
1034         /* DEP support only */
1035         skb_put_u8(skb, PN533_INIT_TARGET_DEP);
1036
1037         /* MIFARE params */
1038         skb_put_data(skb, mifare_params, 6);
1039
1040         /* Felica params */
1041         felica = skb_put_data(skb, felica_params, 18);
1042         get_random_bytes(felica + 2, 6);
1043
1044         /* NFCID3 */
1045         nfcid3 = skb_put_zero(skb, 10);
1046         memcpy(nfcid3, felica, 8);
1047
1048         /* General bytes */
1049         skb_put_u8(skb, gbytes_len);
1050
1051         skb_put_data(skb, gbytes, gbytes_len);
1052
1053         /* Len Tk */
1054         skb_put_u8(skb, 0);
1055
1056         return skb;
1057 }
1058
1059 static void pn533_wq_tm_mi_recv(struct work_struct *work);
1060 static struct sk_buff *pn533_build_response(struct pn533 *dev);
1061
1062 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1063                                       struct sk_buff *resp)
1064 {
1065         struct sk_buff *skb;
1066         u8 status, ret, mi;
1067         int rc;
1068
1069         dev_dbg(dev->dev, "%s\n", __func__);
1070
1071         if (IS_ERR(resp)) {
1072                 skb_queue_purge(&dev->resp_q);
1073                 return PTR_ERR(resp);
1074         }
1075
1076         status = resp->data[0];
1077
1078         ret = status & PN533_CMD_RET_MASK;
1079         mi = status & PN533_CMD_MI_MASK;
1080
1081         skb_pull(resp, sizeof(status));
1082
1083         if (ret != PN533_CMD_RET_SUCCESS) {
1084                 rc = -EIO;
1085                 goto error;
1086         }
1087
1088         skb_queue_tail(&dev->resp_q, resp);
1089
1090         if (mi) {
1091                 queue_work(dev->wq, &dev->mi_tm_rx_work);
1092                 return -EINPROGRESS;
1093         }
1094
1095         skb = pn533_build_response(dev);
1096         if (!skb) {
1097                 rc = -EIO;
1098                 goto error;
1099         }
1100
1101         return nfc_tm_data_received(dev->nfc_dev, skb);
1102
1103 error:
1104         nfc_tm_deactivated(dev->nfc_dev);
1105         dev->tgt_mode = 0;
1106         skb_queue_purge(&dev->resp_q);
1107         dev_kfree_skb(resp);
1108
1109         return rc;
1110 }
1111
1112 static void pn533_wq_tm_mi_recv(struct work_struct *work)
1113 {
1114         struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work);
1115         struct sk_buff *skb;
1116         int rc;
1117
1118         dev_dbg(dev->dev, "%s\n", __func__);
1119
1120         skb = pn533_alloc_skb(dev, 0);
1121         if (!skb)
1122                 return;
1123
1124         rc = pn533_send_cmd_direct_async(dev,
1125                                         PN533_CMD_TG_GET_DATA,
1126                                         skb,
1127                                         pn533_tm_get_data_complete,
1128                                         NULL);
1129
1130         if (rc < 0)
1131                 dev_kfree_skb(skb);
1132 }
1133
1134 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
1135                                   struct sk_buff *resp);
1136 static void pn533_wq_tm_mi_send(struct work_struct *work)
1137 {
1138         struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
1139         struct sk_buff *skb;
1140         int rc;
1141
1142         dev_dbg(dev->dev, "%s\n", __func__);
1143
1144         /* Grab the first skb in the queue */
1145         skb = skb_dequeue(&dev->fragment_skb);
1146         if (skb == NULL) {      /* No more data */
1147                 /* Reset the queue for future use */
1148                 skb_queue_head_init(&dev->fragment_skb);
1149                 goto error;
1150         }
1151
1152         /* last entry - remove MI bit */
1153         if (skb_queue_len(&dev->fragment_skb) == 0) {
1154                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
1155                                         skb, pn533_tm_send_complete, NULL);
1156         } else
1157                 rc = pn533_send_cmd_direct_async(dev,
1158                                         PN533_CMD_TG_SET_META_DATA,
1159                                         skb, pn533_tm_send_complete, NULL);
1160
1161         if (rc == 0) /* success */
1162                 return;
1163
1164         dev_err(dev->dev,
1165                 "Error %d when trying to perform set meta data_exchange", rc);
1166
1167         dev_kfree_skb(skb);
1168
1169 error:
1170         dev->phy_ops->send_ack(dev, GFP_KERNEL);
1171         queue_work(dev->wq, &dev->cmd_work);
1172 }
1173
1174 static void pn533_wq_tg_get_data(struct work_struct *work)
1175 {
1176         struct pn533 *dev = container_of(work, struct pn533, tg_work);
1177         struct sk_buff *skb;
1178         int rc;
1179
1180         dev_dbg(dev->dev, "%s\n", __func__);
1181
1182         skb = pn533_alloc_skb(dev, 0);
1183         if (!skb)
1184                 return;
1185
1186         rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1187                                    pn533_tm_get_data_complete, NULL);
1188
1189         if (rc < 0)
1190                 dev_kfree_skb(skb);
1191 }
1192
1193 #define ATR_REQ_GB_OFFSET 17
1194 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1195 {
1196         u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1197         size_t gb_len;
1198         int rc;
1199
1200         dev_dbg(dev->dev, "%s\n", __func__);
1201
1202         if (resp->len < ATR_REQ_GB_OFFSET + 1)
1203                 return -EINVAL;
1204
1205         mode = resp->data[0];
1206         cmd = &resp->data[1];
1207
1208         dev_dbg(dev->dev, "Target mode 0x%x len %d\n",
1209                 mode, resp->len);
1210
1211         if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1212             PN533_INIT_TARGET_RESP_ACTIVE)
1213                 comm_mode = NFC_COMM_ACTIVE;
1214
1215         if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0)  /* Only DEP supported */
1216                 return -EOPNOTSUPP;
1217
1218         gb = cmd + ATR_REQ_GB_OFFSET;
1219         gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1220
1221         rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1222                               comm_mode, gb, gb_len);
1223         if (rc < 0) {
1224                 nfc_err(dev->dev,
1225                         "Error when signaling target activation\n");
1226                 return rc;
1227         }
1228
1229         dev->tgt_mode = 1;
1230         queue_work(dev->wq, &dev->tg_work);
1231
1232         return 0;
1233 }
1234
1235 static void pn533_listen_mode_timer(unsigned long data)
1236 {
1237         struct pn533 *dev = (struct pn533 *)data;
1238
1239         dev_dbg(dev->dev, "Listen mode timeout\n");
1240
1241         dev->cancel_listen = 1;
1242
1243         pn533_poll_next_mod(dev);
1244
1245         queue_delayed_work(dev->wq, &dev->poll_work,
1246                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1247 }
1248
1249 static int pn533_rf_complete(struct pn533 *dev, void *arg,
1250                              struct sk_buff *resp)
1251 {
1252         int rc = 0;
1253
1254         dev_dbg(dev->dev, "%s\n", __func__);
1255
1256         if (IS_ERR(resp)) {
1257                 rc = PTR_ERR(resp);
1258
1259                 nfc_err(dev->dev, "RF setting error %d\n", rc);
1260
1261                 return rc;
1262         }
1263
1264         queue_delayed_work(dev->wq, &dev->poll_work,
1265                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1266
1267         dev_kfree_skb(resp);
1268         return rc;
1269 }
1270
1271 static void pn533_wq_rf(struct work_struct *work)
1272 {
1273         struct pn533 *dev = container_of(work, struct pn533, rf_work);
1274         struct sk_buff *skb;
1275         int rc;
1276
1277         dev_dbg(dev->dev, "%s\n", __func__);
1278
1279         skb = pn533_alloc_skb(dev, 2);
1280         if (!skb)
1281                 return;
1282
1283         skb_put_u8(skb, PN533_CFGITEM_RF_FIELD);
1284         skb_put_u8(skb, PN533_CFGITEM_RF_FIELD_AUTO_RFCA);
1285
1286         rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1287                                   pn533_rf_complete, NULL);
1288         if (rc < 0) {
1289                 dev_kfree_skb(skb);
1290                 nfc_err(dev->dev, "RF setting error %d\n", rc);
1291         }
1292 }
1293
1294 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg,
1295                                    struct sk_buff *resp)
1296 {
1297         struct pn533_cmd_jump_dep_response *rsp;
1298         struct nfc_target nfc_target;
1299         u8 target_gt_len;
1300         int rc;
1301
1302         if (IS_ERR(resp))
1303                 return PTR_ERR(resp);
1304
1305         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1306
1307         rc = rsp->status & PN533_CMD_RET_MASK;
1308         if (rc != PN533_CMD_RET_SUCCESS) {
1309                 /* Not target found, turn radio off */
1310                 queue_work(dev->wq, &dev->rf_work);
1311
1312                 dev_kfree_skb(resp);
1313                 return 0;
1314         }
1315
1316         dev_dbg(dev->dev, "Creating new target");
1317
1318         nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1319         nfc_target.nfcid1_len = 10;
1320         memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1321         rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1322         if (rc)
1323                 goto error;
1324
1325         dev->tgt_available_prots = 0;
1326         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1327
1328         /* ATR_RES general bytes are located at offset 17 */
1329         target_gt_len = resp->len - 17;
1330         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1331                                           rsp->gt, target_gt_len);
1332         if (!rc) {
1333                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1334                                         dev->nfc_dev->targets[0].idx,
1335                                         0, NFC_RF_INITIATOR);
1336
1337                 if (!rc)
1338                         pn533_poll_reset_mod_list(dev);
1339         }
1340 error:
1341         dev_kfree_skb(resp);
1342         return rc;
1343 }
1344
1345 #define PASSIVE_DATA_LEN 5
1346 static int pn533_poll_dep(struct nfc_dev *nfc_dev)
1347 {
1348         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1349         struct sk_buff *skb;
1350         int rc, skb_len;
1351         u8 *next, nfcid3[NFC_NFCID3_MAXSIZE];
1352         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1353
1354         dev_dbg(dev->dev, "%s", __func__);
1355
1356         if (!dev->gb) {
1357                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1358
1359                 if (!dev->gb || !dev->gb_len) {
1360                         dev->poll_dep = 0;
1361                         queue_work(dev->wq, &dev->rf_work);
1362                 }
1363         }
1364
1365         skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1366         skb_len += PASSIVE_DATA_LEN;
1367
1368         /* NFCID3 */
1369         skb_len += NFC_NFCID3_MAXSIZE;
1370         nfcid3[0] = 0x1;
1371         nfcid3[1] = 0xfe;
1372         get_random_bytes(nfcid3 + 2, 6);
1373
1374         skb = pn533_alloc_skb(dev, skb_len);
1375         if (!skb)
1376                 return -ENOMEM;
1377
1378         skb_put_u8(skb, 0x01);  /* Active */
1379         skb_put_u8(skb, 0x02);  /* 424 kbps */
1380
1381         next = skb_put(skb, 1);  /* Next */
1382         *next = 0;
1383
1384         /* Copy passive data */
1385         skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
1386         *next |= 1;
1387
1388         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1389         skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
1390         *next |= 2;
1391
1392         skb_put_data(skb, dev->gb, dev->gb_len);
1393         *next |= 4; /* We have some Gi */
1394
1395         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1396                                   pn533_poll_dep_complete, NULL);
1397
1398         if (rc < 0)
1399                 dev_kfree_skb(skb);
1400
1401         return rc;
1402 }
1403
1404 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1405                                struct sk_buff *resp)
1406 {
1407         struct pn533_poll_modulations *cur_mod;
1408         int rc;
1409
1410         dev_dbg(dev->dev, "%s\n", __func__);
1411
1412         if (IS_ERR(resp)) {
1413                 rc = PTR_ERR(resp);
1414
1415                 nfc_err(dev->dev, "%s  Poll complete error %d\n",
1416                         __func__, rc);
1417
1418                 if (rc == -ENOENT) {
1419                         if (dev->poll_mod_count != 0)
1420                                 return rc;
1421                         goto stop_poll;
1422                 } else if (rc < 0) {
1423                         nfc_err(dev->dev,
1424                                 "Error %d when running poll\n", rc);
1425                         goto stop_poll;
1426                 }
1427         }
1428
1429         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1430
1431         if (cur_mod->len == 0) { /* Target mode */
1432                 del_timer(&dev->listen_timer);
1433                 rc = pn533_init_target_complete(dev, resp);
1434                 goto done;
1435         }
1436
1437         /* Initiator mode */
1438         rc = pn533_start_poll_complete(dev, resp);
1439         if (!rc)
1440                 goto done;
1441
1442         if (!dev->poll_mod_count) {
1443                 dev_dbg(dev->dev, "Polling has been stopped\n");
1444                 goto done;
1445         }
1446
1447         pn533_poll_next_mod(dev);
1448         /* Not target found, turn radio off */
1449         queue_work(dev->wq, &dev->rf_work);
1450
1451 done:
1452         dev_kfree_skb(resp);
1453         return rc;
1454
1455 stop_poll:
1456         nfc_err(dev->dev, "Polling operation has been stopped\n");
1457
1458         pn533_poll_reset_mod_list(dev);
1459         dev->poll_protocols = 0;
1460         return rc;
1461 }
1462
1463 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1464                                         struct pn533_poll_modulations *mod)
1465 {
1466         struct sk_buff *skb;
1467
1468         skb = pn533_alloc_skb(dev, mod->len);
1469         if (!skb)
1470                 return NULL;
1471
1472         skb_put_data(skb, &mod->data, mod->len);
1473
1474         return skb;
1475 }
1476
1477 static int pn533_send_poll_frame(struct pn533 *dev)
1478 {
1479         struct pn533_poll_modulations *mod;
1480         struct sk_buff *skb;
1481         int rc;
1482         u8 cmd_code;
1483
1484         mod = dev->poll_mod_active[dev->poll_mod_curr];
1485
1486         dev_dbg(dev->dev, "%s mod len %d\n",
1487                 __func__, mod->len);
1488
1489         if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep)  {
1490                 dev->poll_dep = 0;
1491                 return pn533_poll_dep(dev->nfc_dev);
1492         }
1493
1494         if (mod->len == 0) {  /* Listen mode */
1495                 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1496                 skb = pn533_alloc_poll_tg_frame(dev);
1497         } else {  /* Polling mode */
1498                 cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
1499                 skb = pn533_alloc_poll_in_frame(dev, mod);
1500         }
1501
1502         if (!skb) {
1503                 nfc_err(dev->dev, "Failed to allocate skb\n");
1504                 return -ENOMEM;
1505         }
1506
1507         rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1508                                   NULL);
1509         if (rc < 0) {
1510                 dev_kfree_skb(skb);
1511                 nfc_err(dev->dev, "Polling loop error %d\n", rc);
1512         }
1513
1514         return rc;
1515 }
1516
1517 static void pn533_wq_poll(struct work_struct *work)
1518 {
1519         struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1520         struct pn533_poll_modulations *cur_mod;
1521         int rc;
1522
1523         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1524
1525         dev_dbg(dev->dev,
1526                 "%s cancel_listen %d modulation len %d\n",
1527                 __func__, dev->cancel_listen, cur_mod->len);
1528
1529         if (dev->cancel_listen == 1) {
1530                 dev->cancel_listen = 0;
1531                 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC);
1532         }
1533
1534         rc = pn533_send_poll_frame(dev);
1535         if (rc)
1536                 return;
1537
1538         if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1539                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1540 }
1541
1542 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1543                             u32 im_protocols, u32 tm_protocols)
1544 {
1545         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1546         struct pn533_poll_modulations *cur_mod;
1547         u8 rand_mod;
1548         int rc;
1549
1550         dev_dbg(dev->dev,
1551                 "%s: im protocols 0x%x tm protocols 0x%x\n",
1552                 __func__, im_protocols, tm_protocols);
1553
1554         if (dev->tgt_active_prot) {
1555                 nfc_err(dev->dev,
1556                         "Cannot poll with a target already activated\n");
1557                 return -EBUSY;
1558         }
1559
1560         if (dev->tgt_mode) {
1561                 nfc_err(dev->dev,
1562                         "Cannot poll while already being activated\n");
1563                 return -EBUSY;
1564         }
1565
1566         if (tm_protocols) {
1567                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1568                 if (dev->gb == NULL)
1569                         tm_protocols = 0;
1570         }
1571
1572         pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1573         dev->poll_protocols = im_protocols;
1574         dev->listen_protocols = tm_protocols;
1575
1576         /* Do not always start polling from the same modulation */
1577         get_random_bytes(&rand_mod, sizeof(rand_mod));
1578         rand_mod %= dev->poll_mod_count;
1579         dev->poll_mod_curr = rand_mod;
1580
1581         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1582
1583         rc = pn533_send_poll_frame(dev);
1584
1585         /* Start listen timer */
1586         if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
1587                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1588
1589         return rc;
1590 }
1591
1592 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1593 {
1594         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1595
1596         del_timer(&dev->listen_timer);
1597
1598         if (!dev->poll_mod_count) {
1599                 dev_dbg(dev->dev,
1600                         "Polling operation was not running\n");
1601                 return;
1602         }
1603
1604         dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1605         flush_delayed_work(&dev->poll_work);
1606         pn533_poll_reset_mod_list(dev);
1607 }
1608
1609 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1610 {
1611         struct pn533_cmd_activate_response *rsp;
1612         u16 gt_len;
1613         int rc;
1614         struct sk_buff *skb;
1615         struct sk_buff *resp;
1616
1617         dev_dbg(dev->dev, "%s\n", __func__);
1618
1619         skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1620         if (!skb)
1621                 return -ENOMEM;
1622
1623         skb_put_u8(skb, 1); /* TG */
1624         skb_put_u8(skb, 0); /* Next */
1625
1626         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1627         if (IS_ERR(resp))
1628                 return PTR_ERR(resp);
1629
1630         rsp = (struct pn533_cmd_activate_response *)resp->data;
1631         rc = rsp->status & PN533_CMD_RET_MASK;
1632         if (rc != PN533_CMD_RET_SUCCESS) {
1633                 nfc_err(dev->dev,
1634                         "Target activation failed (error 0x%x)\n", rc);
1635                 dev_kfree_skb(resp);
1636                 return -EIO;
1637         }
1638
1639         /* ATR_RES general bytes are located at offset 16 */
1640         gt_len = resp->len - 16;
1641         rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1642
1643         dev_kfree_skb(resp);
1644         return rc;
1645 }
1646
1647 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1648                                  struct nfc_target *target, u32 protocol)
1649 {
1650         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1651         int rc;
1652
1653         dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol);
1654
1655         if (dev->poll_mod_count) {
1656                 nfc_err(dev->dev,
1657                         "Cannot activate while polling\n");
1658                 return -EBUSY;
1659         }
1660
1661         if (dev->tgt_active_prot) {
1662                 nfc_err(dev->dev,
1663                         "There is already an active target\n");
1664                 return -EBUSY;
1665         }
1666
1667         if (!dev->tgt_available_prots) {
1668                 nfc_err(dev->dev,
1669                         "There is no available target to activate\n");
1670                 return -EINVAL;
1671         }
1672
1673         if (!(dev->tgt_available_prots & (1 << protocol))) {
1674                 nfc_err(dev->dev,
1675                         "Target doesn't support requested proto %u\n",
1676                         protocol);
1677                 return -EINVAL;
1678         }
1679
1680         if (protocol == NFC_PROTO_NFC_DEP) {
1681                 rc = pn533_activate_target_nfcdep(dev);
1682                 if (rc) {
1683                         nfc_err(dev->dev,
1684                                 "Activating target with DEP failed %d\n", rc);
1685                         return rc;
1686                 }
1687         }
1688
1689         dev->tgt_active_prot = protocol;
1690         dev->tgt_available_prots = 0;
1691
1692         return 0;
1693 }
1694
1695 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg,
1696                              struct sk_buff *resp)
1697 {
1698         int rc = 0;
1699
1700         dev_dbg(dev->dev, "%s\n", __func__);
1701
1702         if (IS_ERR(resp)) {
1703                 rc = PTR_ERR(resp);
1704
1705                 nfc_err(dev->dev, "Target release error %d\n", rc);
1706
1707                 return rc;
1708         }
1709
1710         rc = resp->data[0] & PN533_CMD_RET_MASK;
1711         if (rc != PN533_CMD_RET_SUCCESS)
1712                 nfc_err(dev->dev,
1713                         "Error 0x%x when releasing the target\n", rc);
1714
1715         dev_kfree_skb(resp);
1716         return rc;
1717 }
1718
1719 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1720                                     struct nfc_target *target, u8 mode)
1721 {
1722         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1723         struct sk_buff *skb;
1724         int rc;
1725
1726         dev_dbg(dev->dev, "%s\n", __func__);
1727
1728         if (!dev->tgt_active_prot) {
1729                 nfc_err(dev->dev, "There is no active target\n");
1730                 return;
1731         }
1732
1733         dev->tgt_active_prot = 0;
1734         skb_queue_purge(&dev->resp_q);
1735
1736         skb = pn533_alloc_skb(dev, sizeof(u8));
1737         if (!skb)
1738                 return;
1739
1740         skb_put_u8(skb, 1); /* TG*/
1741
1742         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb,
1743                                   pn533_deactivate_target_complete, NULL);
1744         if (rc < 0) {
1745                 dev_kfree_skb(skb);
1746                 nfc_err(dev->dev, "Target release error %d\n", rc);
1747         }
1748 }
1749
1750
1751 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1752                                          struct sk_buff *resp)
1753 {
1754         struct pn533_cmd_jump_dep_response *rsp;
1755         u8 target_gt_len;
1756         int rc;
1757         u8 active = *(u8 *)arg;
1758
1759         kfree(arg);
1760
1761         if (IS_ERR(resp))
1762                 return PTR_ERR(resp);
1763
1764         if (dev->tgt_available_prots &&
1765             !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1766                 nfc_err(dev->dev,
1767                         "The target does not support DEP\n");
1768                 rc =  -EINVAL;
1769                 goto error;
1770         }
1771
1772         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1773
1774         rc = rsp->status & PN533_CMD_RET_MASK;
1775         if (rc != PN533_CMD_RET_SUCCESS) {
1776                 nfc_err(dev->dev,
1777                         "Bringing DEP link up failed (error 0x%x)\n", rc);
1778                 goto error;
1779         }
1780
1781         if (!dev->tgt_available_prots) {
1782                 struct nfc_target nfc_target;
1783
1784                 dev_dbg(dev->dev, "Creating new target\n");
1785
1786                 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1787                 nfc_target.nfcid1_len = 10;
1788                 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1789                 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1790                 if (rc)
1791                         goto error;
1792
1793                 dev->tgt_available_prots = 0;
1794         }
1795
1796         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1797
1798         /* ATR_RES general bytes are located at offset 17 */
1799         target_gt_len = resp->len - 17;
1800         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1801                                           rsp->gt, target_gt_len);
1802         if (rc == 0)
1803                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1804                                         dev->nfc_dev->targets[0].idx,
1805                                         !active, NFC_RF_INITIATOR);
1806
1807 error:
1808         dev_kfree_skb(resp);
1809         return rc;
1810 }
1811
1812 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
1813 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1814                              u8 comm_mode, u8 *gb, size_t gb_len)
1815 {
1816         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1817         struct sk_buff *skb;
1818         int rc, skb_len;
1819         u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
1820         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1821
1822         dev_dbg(dev->dev, "%s\n", __func__);
1823
1824         if (dev->poll_mod_count) {
1825                 nfc_err(dev->dev,
1826                         "Cannot bring the DEP link up while polling\n");
1827                 return -EBUSY;
1828         }
1829
1830         if (dev->tgt_active_prot) {
1831                 nfc_err(dev->dev,
1832                         "There is already an active target\n");
1833                 return -EBUSY;
1834         }
1835
1836         skb_len = 3 + gb_len; /* ActPass + BR + Next */
1837         skb_len += PASSIVE_DATA_LEN;
1838
1839         /* NFCID3 */
1840         skb_len += NFC_NFCID3_MAXSIZE;
1841         if (target && !target->nfcid2_len) {
1842                 nfcid3[0] = 0x1;
1843                 nfcid3[1] = 0xfe;
1844                 get_random_bytes(nfcid3 + 2, 6);
1845         }
1846
1847         skb = pn533_alloc_skb(dev, skb_len);
1848         if (!skb)
1849                 return -ENOMEM;
1850
1851         skb_put_u8(skb, !comm_mode);  /* ActPass */
1852         skb_put_u8(skb, 0x02);  /* 424 kbps */
1853
1854         next = skb_put(skb, 1);  /* Next */
1855         *next = 0;
1856
1857         /* Copy passive data */
1858         skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
1859         *next |= 1;
1860
1861         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1862         if (target && target->nfcid2_len)
1863                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
1864                        target->nfcid2_len);
1865         else
1866                 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
1867         *next |= 2;
1868
1869         if (gb != NULL && gb_len > 0) {
1870                 skb_put_data(skb, gb, gb_len);
1871                 *next |= 4; /* We have some Gi */
1872         } else {
1873                 *next = 0;
1874         }
1875
1876         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
1877         if (!arg) {
1878                 dev_kfree_skb(skb);
1879                 return -ENOMEM;
1880         }
1881
1882         *arg = !comm_mode;
1883
1884         pn533_rf_field(dev->nfc_dev, 0);
1885
1886         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1887                                   pn533_in_dep_link_up_complete, arg);
1888
1889         if (rc < 0) {
1890                 dev_kfree_skb(skb);
1891                 kfree(arg);
1892         }
1893
1894         return rc;
1895 }
1896
1897 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
1898 {
1899         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1900
1901         dev_dbg(dev->dev, "%s\n", __func__);
1902
1903         pn533_poll_reset_mod_list(dev);
1904
1905         if (dev->tgt_mode || dev->tgt_active_prot)
1906                 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1907
1908         dev->tgt_active_prot = 0;
1909         dev->tgt_mode = 0;
1910
1911         skb_queue_purge(&dev->resp_q);
1912
1913         return 0;
1914 }
1915
1916 struct pn533_data_exchange_arg {
1917         data_exchange_cb_t cb;
1918         void *cb_context;
1919 };
1920
1921 static struct sk_buff *pn533_build_response(struct pn533 *dev)
1922 {
1923         struct sk_buff *skb, *tmp, *t;
1924         unsigned int skb_len = 0, tmp_len = 0;
1925
1926         dev_dbg(dev->dev, "%s\n", __func__);
1927
1928         if (skb_queue_empty(&dev->resp_q))
1929                 return NULL;
1930
1931         if (skb_queue_len(&dev->resp_q) == 1) {
1932                 skb = skb_dequeue(&dev->resp_q);
1933                 goto out;
1934         }
1935
1936         skb_queue_walk_safe(&dev->resp_q, tmp, t)
1937                 skb_len += tmp->len;
1938
1939         dev_dbg(dev->dev, "%s total length %d\n",
1940                 __func__, skb_len);
1941
1942         skb = alloc_skb(skb_len, GFP_KERNEL);
1943         if (skb == NULL)
1944                 goto out;
1945
1946         skb_put(skb, skb_len);
1947
1948         skb_queue_walk_safe(&dev->resp_q, tmp, t) {
1949                 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
1950                 tmp_len += tmp->len;
1951         }
1952
1953 out:
1954         skb_queue_purge(&dev->resp_q);
1955
1956         return skb;
1957 }
1958
1959 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
1960                                         struct sk_buff *resp)
1961 {
1962         struct pn533_data_exchange_arg *arg = _arg;
1963         struct sk_buff *skb;
1964         int rc = 0;
1965         u8 status, ret, mi;
1966
1967         dev_dbg(dev->dev, "%s\n", __func__);
1968
1969         if (IS_ERR(resp)) {
1970                 rc = PTR_ERR(resp);
1971                 goto _error;
1972         }
1973
1974         status = resp->data[0];
1975         ret = status & PN533_CMD_RET_MASK;
1976         mi = status & PN533_CMD_MI_MASK;
1977
1978         skb_pull(resp, sizeof(status));
1979
1980         if (ret != PN533_CMD_RET_SUCCESS) {
1981                 nfc_err(dev->dev,
1982                         "Exchanging data failed (error 0x%x)\n", ret);
1983                 rc = -EIO;
1984                 goto error;
1985         }
1986
1987         skb_queue_tail(&dev->resp_q, resp);
1988
1989         if (mi) {
1990                 dev->cmd_complete_mi_arg = arg;
1991                 queue_work(dev->wq, &dev->mi_rx_work);
1992                 return -EINPROGRESS;
1993         }
1994
1995         /* Prepare for the next round */
1996         if (skb_queue_len(&dev->fragment_skb) > 0) {
1997                 dev->cmd_complete_dep_arg = arg;
1998                 queue_work(dev->wq, &dev->mi_tx_work);
1999
2000                 return -EINPROGRESS;
2001         }
2002
2003         skb = pn533_build_response(dev);
2004         if (!skb) {
2005                 rc = -ENOMEM;
2006                 goto error;
2007         }
2008
2009         arg->cb(arg->cb_context, skb, 0);
2010         kfree(arg);
2011         return 0;
2012
2013 error:
2014         dev_kfree_skb(resp);
2015 _error:
2016         skb_queue_purge(&dev->resp_q);
2017         arg->cb(arg->cb_context, NULL, rc);
2018         kfree(arg);
2019         return rc;
2020 }
2021
2022 /*
2023  * Receive an incoming pn533 frame. skb contains only header and payload.
2024  * If skb == NULL, it is a notification that the link below is dead.
2025  */
2026 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2027 {
2028         if (!dev->cmd)
2029                 goto sched_wq;
2030
2031         dev->cmd->status = status;
2032
2033         if (status != 0) {
2034                 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2035                 goto sched_wq;
2036         }
2037
2038         if (skb == NULL) {
2039                 pr_err("NULL Frame -> link is dead\n");
2040                 goto sched_wq;
2041         }
2042
2043         if (pn533_rx_frame_is_ack(skb->data)) {
2044                 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2045                 dev_kfree_skb(skb);
2046                 return;
2047         }
2048
2049         print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2050                              dev->ops->rx_frame_size(skb->data), false);
2051
2052         if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2053                 nfc_err(dev->dev, "Received an invalid frame\n");
2054                 dev->cmd->status = -EIO;
2055         } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2056                 nfc_err(dev->dev, "It it not the response to the last command\n");
2057                 dev->cmd->status = -EIO;
2058         }
2059
2060         dev->cmd->resp = skb;
2061
2062 sched_wq:
2063         queue_work(dev->wq, &dev->cmd_complete_work);
2064 }
2065 EXPORT_SYMBOL(pn533_recv_frame);
2066
2067 /* Split the Tx skb into small chunks */
2068 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2069 {
2070         struct sk_buff *frag;
2071         int  frag_size;
2072
2073         do {
2074                 /* Remaining size */
2075                 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2076                         frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2077                 else
2078                         frag_size = skb->len;
2079
2080                 /* Allocate and reserve */
2081                 frag = pn533_alloc_skb(dev, frag_size);
2082                 if (!frag) {
2083                         skb_queue_purge(&dev->fragment_skb);
2084                         break;
2085                 }
2086
2087                 if (!dev->tgt_mode) {
2088                         /* Reserve the TG/MI byte */
2089                         skb_reserve(frag, 1);
2090
2091                         /* MI + TG */
2092                         if (frag_size  == PN533_CMD_DATAFRAME_MAXLEN)
2093                                 *(u8 *)skb_push(frag, sizeof(u8)) =
2094                                                 (PN533_CMD_MI_MASK | 1);
2095                         else
2096                                 *(u8 *)skb_push(frag, sizeof(u8)) =  1; /* TG */
2097                 }
2098
2099                 skb_put_data(frag, skb->data, frag_size);
2100
2101                 /* Reduce the size of incoming buffer */
2102                 skb_pull(skb, frag_size);
2103
2104                 /* Add this to skb_queue */
2105                 skb_queue_tail(&dev->fragment_skb, frag);
2106
2107         } while (skb->len > 0);
2108
2109         dev_kfree_skb(skb);
2110
2111         return skb_queue_len(&dev->fragment_skb);
2112 }
2113
2114 static int pn533_transceive(struct nfc_dev *nfc_dev,
2115                             struct nfc_target *target, struct sk_buff *skb,
2116                             data_exchange_cb_t cb, void *cb_context)
2117 {
2118         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2119         struct pn533_data_exchange_arg *arg = NULL;
2120         int rc;
2121
2122         dev_dbg(dev->dev, "%s\n", __func__);
2123
2124         if (!dev->tgt_active_prot) {
2125                 nfc_err(dev->dev,
2126                         "Can't exchange data if there is no active target\n");
2127                 rc = -EINVAL;
2128                 goto error;
2129         }
2130
2131         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2132         if (!arg) {
2133                 rc = -ENOMEM;
2134                 goto error;
2135         }
2136
2137         arg->cb = cb;
2138         arg->cb_context = cb_context;
2139
2140         switch (dev->device_type) {
2141         case PN533_DEVICE_PASORI:
2142                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2143                         rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2144                                                    skb,
2145                                                    pn533_data_exchange_complete,
2146                                                    arg);
2147
2148                         break;
2149                 }
2150         default:
2151                 /* jumbo frame ? */
2152                 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2153                         rc = pn533_fill_fragment_skbs(dev, skb);
2154                         if (rc <= 0)
2155                                 goto error;
2156
2157                         skb = skb_dequeue(&dev->fragment_skb);
2158                         if (!skb) {
2159                                 rc = -EIO;
2160                                 goto error;
2161                         }
2162                 } else {
2163                         *(u8 *)skb_push(skb, sizeof(u8)) =  1; /* TG */
2164                 }
2165
2166                 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2167                                            skb, pn533_data_exchange_complete,
2168                                            arg);
2169
2170                 break;
2171         }
2172
2173         if (rc < 0) /* rc from send_async */
2174                 goto error;
2175
2176         return 0;
2177
2178 error:
2179         kfree(arg);
2180         dev_kfree_skb(skb);
2181         return rc;
2182 }
2183
2184 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2185                                   struct sk_buff *resp)
2186 {
2187         u8 status;
2188
2189         dev_dbg(dev->dev, "%s\n", __func__);
2190
2191         if (IS_ERR(resp))
2192                 return PTR_ERR(resp);
2193
2194         status = resp->data[0];
2195
2196         /* Prepare for the next round */
2197         if (skb_queue_len(&dev->fragment_skb) > 0) {
2198                 queue_work(dev->wq, &dev->mi_tm_tx_work);
2199                 return -EINPROGRESS;
2200         }
2201         dev_kfree_skb(resp);
2202
2203         if (status != 0) {
2204                 nfc_tm_deactivated(dev->nfc_dev);
2205
2206                 dev->tgt_mode = 0;
2207
2208                 return 0;
2209         }
2210
2211         queue_work(dev->wq, &dev->tg_work);
2212
2213         return 0;
2214 }
2215
2216 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2217 {
2218         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2219         int rc;
2220
2221         dev_dbg(dev->dev, "%s\n", __func__);
2222
2223         /* let's split in multiple chunks if size's too big */
2224         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2225                 rc = pn533_fill_fragment_skbs(dev, skb);
2226                 if (rc <= 0)
2227                         goto error;
2228
2229                 /* get the first skb */
2230                 skb = skb_dequeue(&dev->fragment_skb);
2231                 if (!skb) {
2232                         rc = -EIO;
2233                         goto error;
2234                 }
2235
2236                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2237                                                 pn533_tm_send_complete, NULL);
2238         } else {
2239                 /* Send th skb */
2240                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2241                                                 pn533_tm_send_complete, NULL);
2242         }
2243
2244 error:
2245         if (rc < 0) {
2246                 dev_kfree_skb(skb);
2247                 skb_queue_purge(&dev->fragment_skb);
2248         }
2249
2250         return rc;
2251 }
2252
2253 static void pn533_wq_mi_recv(struct work_struct *work)
2254 {
2255         struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2256         struct sk_buff *skb;
2257         int rc;
2258
2259         dev_dbg(dev->dev, "%s\n", __func__);
2260
2261         skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2262         if (!skb)
2263                 goto error;
2264
2265         switch (dev->device_type) {
2266         case PN533_DEVICE_PASORI:
2267                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2268                         rc = pn533_send_cmd_direct_async(dev,
2269                                                 PN533_CMD_IN_COMM_THRU,
2270                                                 skb,
2271                                                 pn533_data_exchange_complete,
2272                                                  dev->cmd_complete_mi_arg);
2273
2274                         break;
2275                 }
2276         default:
2277                 skb_put_u8(skb, 1); /*TG*/
2278
2279                 rc = pn533_send_cmd_direct_async(dev,
2280                                                  PN533_CMD_IN_DATA_EXCHANGE,
2281                                                  skb,
2282                                                  pn533_data_exchange_complete,
2283                                                  dev->cmd_complete_mi_arg);
2284
2285                 break;
2286         }
2287
2288         if (rc == 0) /* success */
2289                 return;
2290
2291         nfc_err(dev->dev,
2292                 "Error %d when trying to perform data_exchange\n", rc);
2293
2294         dev_kfree_skb(skb);
2295         kfree(dev->cmd_complete_mi_arg);
2296
2297 error:
2298         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2299         queue_work(dev->wq, &dev->cmd_work);
2300 }
2301
2302 static void pn533_wq_mi_send(struct work_struct *work)
2303 {
2304         struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2305         struct sk_buff *skb;
2306         int rc;
2307
2308         dev_dbg(dev->dev, "%s\n", __func__);
2309
2310         /* Grab the first skb in the queue */
2311         skb = skb_dequeue(&dev->fragment_skb);
2312
2313         if (skb == NULL) {      /* No more data */
2314                 /* Reset the queue for future use */
2315                 skb_queue_head_init(&dev->fragment_skb);
2316                 goto error;
2317         }
2318
2319         switch (dev->device_type) {
2320         case PN533_DEVICE_PASORI:
2321                 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2322                         rc = -EIO;
2323                         break;
2324                 }
2325
2326                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2327                                                  skb,
2328                                                  pn533_data_exchange_complete,
2329                                                  dev->cmd_complete_dep_arg);
2330
2331                 break;
2332
2333         default:
2334                 /* Still some fragments? */
2335                 rc = pn533_send_cmd_direct_async(dev,
2336                                                  PN533_CMD_IN_DATA_EXCHANGE,
2337                                                  skb,
2338                                                  pn533_data_exchange_complete,
2339                                                  dev->cmd_complete_dep_arg);
2340
2341                 break;
2342         }
2343
2344         if (rc == 0) /* success */
2345                 return;
2346
2347         nfc_err(dev->dev,
2348                 "Error %d when trying to perform data_exchange\n", rc);
2349
2350         dev_kfree_skb(skb);
2351         kfree(dev->cmd_complete_dep_arg);
2352
2353 error:
2354         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2355         queue_work(dev->wq, &dev->cmd_work);
2356 }
2357
2358 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2359                                                                 u8 cfgdata_len)
2360 {
2361         struct sk_buff *skb;
2362         struct sk_buff *resp;
2363         int skb_len;
2364
2365         dev_dbg(dev->dev, "%s\n", __func__);
2366
2367         skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2368
2369         skb = pn533_alloc_skb(dev, skb_len);
2370         if (!skb)
2371                 return -ENOMEM;
2372
2373         skb_put_u8(skb, cfgitem);
2374         skb_put_data(skb, cfgdata, cfgdata_len);
2375
2376         resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2377         if (IS_ERR(resp))
2378                 return PTR_ERR(resp);
2379
2380         dev_kfree_skb(resp);
2381         return 0;
2382 }
2383
2384 static int pn533_get_firmware_version(struct pn533 *dev,
2385                                       struct pn533_fw_version *fv)
2386 {
2387         struct sk_buff *skb;
2388         struct sk_buff *resp;
2389
2390         skb = pn533_alloc_skb(dev, 0);
2391         if (!skb)
2392                 return -ENOMEM;
2393
2394         resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2395         if (IS_ERR(resp))
2396                 return PTR_ERR(resp);
2397
2398         fv->ic = resp->data[0];
2399         fv->ver = resp->data[1];
2400         fv->rev = resp->data[2];
2401         fv->support = resp->data[3];
2402
2403         dev_kfree_skb(resp);
2404         return 0;
2405 }
2406
2407 static int pn533_pasori_fw_reset(struct pn533 *dev)
2408 {
2409         struct sk_buff *skb;
2410         struct sk_buff *resp;
2411
2412         dev_dbg(dev->dev, "%s\n", __func__);
2413
2414         skb = pn533_alloc_skb(dev, sizeof(u8));
2415         if (!skb)
2416                 return -ENOMEM;
2417
2418         skb_put_u8(skb, 0x1);
2419
2420         resp = pn533_send_cmd_sync(dev, 0x18, skb);
2421         if (IS_ERR(resp))
2422                 return PTR_ERR(resp);
2423
2424         dev_kfree_skb(resp);
2425
2426         return 0;
2427 }
2428
2429 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2430 {
2431         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2432         u8 rf_field = !!rf;
2433         int rc;
2434
2435         rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2436
2437         rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2438                                      (u8 *)&rf_field, 1);
2439         if (rc) {
2440                 nfc_err(dev->dev, "Error on setting RF field\n");
2441                 return rc;
2442         }
2443
2444         return rc;
2445 }
2446
2447 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2448 {
2449         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2450         struct sk_buff *skb;
2451         struct sk_buff *resp;
2452
2453         skb = pn533_alloc_skb(dev, 1);
2454         if (!skb)
2455                 return -ENOMEM;
2456
2457         skb_put_u8(skb, 0x01);
2458
2459         resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2460         if (IS_ERR(resp))
2461                 return PTR_ERR(resp);
2462
2463         dev_kfree_skb(resp);
2464         return 0;
2465 }
2466
2467 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2468 {
2469         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2470
2471         if (dev->device_type == PN533_DEVICE_PN532) {
2472                 int rc = pn532_sam_configuration(nfc_dev);
2473
2474                 if (rc)
2475                         return rc;
2476         }
2477
2478         return pn533_rf_field(nfc_dev, 1);
2479 }
2480
2481 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2482 {
2483         return pn533_rf_field(nfc_dev, 0);
2484 }
2485
2486 static struct nfc_ops pn533_nfc_ops = {
2487         .dev_up = pn533_dev_up,
2488         .dev_down = pn533_dev_down,
2489         .dep_link_up = pn533_dep_link_up,
2490         .dep_link_down = pn533_dep_link_down,
2491         .start_poll = pn533_start_poll,
2492         .stop_poll = pn533_stop_poll,
2493         .activate_target = pn533_activate_target,
2494         .deactivate_target = pn533_deactivate_target,
2495         .im_transceive = pn533_transceive,
2496         .tm_send = pn533_tm_send,
2497 };
2498
2499 static int pn533_setup(struct pn533 *dev)
2500 {
2501         struct pn533_config_max_retries max_retries;
2502         struct pn533_config_timing timing;
2503         u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2504         int rc;
2505
2506         switch (dev->device_type) {
2507         case PN533_DEVICE_STD:
2508         case PN533_DEVICE_PASORI:
2509         case PN533_DEVICE_ACR122U:
2510         case PN533_DEVICE_PN532:
2511                 max_retries.mx_rty_atr = 0x2;
2512                 max_retries.mx_rty_psl = 0x1;
2513                 max_retries.mx_rty_passive_act =
2514                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2515
2516                 timing.rfu = PN533_CONFIG_TIMING_102;
2517                 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2518                 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2519
2520                 break;
2521
2522         default:
2523                 nfc_err(dev->dev, "Unknown device type %d\n",
2524                         dev->device_type);
2525                 return -EINVAL;
2526         }
2527
2528         rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2529                                      (u8 *)&max_retries, sizeof(max_retries));
2530         if (rc) {
2531                 nfc_err(dev->dev,
2532                         "Error on setting MAX_RETRIES config\n");
2533                 return rc;
2534         }
2535
2536
2537         rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2538                                      (u8 *)&timing, sizeof(timing));
2539         if (rc) {
2540                 nfc_err(dev->dev, "Error on setting RF timings\n");
2541                 return rc;
2542         }
2543
2544         switch (dev->device_type) {
2545         case PN533_DEVICE_STD:
2546         case PN533_DEVICE_PN532:
2547                 break;
2548
2549         case PN533_DEVICE_PASORI:
2550                 pn533_pasori_fw_reset(dev);
2551
2552                 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2553                                              pasori_cfg, 3);
2554                 if (rc) {
2555                         nfc_err(dev->dev,
2556                                 "Error while settings PASORI config\n");
2557                         return rc;
2558                 }
2559
2560                 pn533_pasori_fw_reset(dev);
2561
2562                 break;
2563         }
2564
2565         return 0;
2566 }
2567
2568 int pn533_finalize_setup(struct pn533 *dev)
2569 {
2570
2571         struct pn533_fw_version fw_ver;
2572         int rc;
2573
2574         memset(&fw_ver, 0, sizeof(fw_ver));
2575
2576         rc = pn533_get_firmware_version(dev, &fw_ver);
2577         if (rc) {
2578                 nfc_err(dev->dev, "Unable to get FW version\n");
2579                 return rc;
2580         }
2581
2582         nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2583                 fw_ver.ic, fw_ver.ver, fw_ver.rev);
2584
2585         rc = pn533_setup(dev);
2586         if (rc)
2587                 return rc;
2588
2589         return 0;
2590 }
2591 EXPORT_SYMBOL_GPL(pn533_finalize_setup);
2592
2593 struct pn533 *pn533_register_device(u32 device_type,
2594                                 u32 protocols,
2595                                 enum pn533_protocol_type protocol_type,
2596                                 void *phy,
2597                                 struct pn533_phy_ops *phy_ops,
2598                                 struct pn533_frame_ops *fops,
2599                                 struct device *dev,
2600                                 struct device *parent)
2601 {
2602         struct pn533 *priv;
2603         int rc = -ENOMEM;
2604
2605         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2606         if (!priv)
2607                 return ERR_PTR(-ENOMEM);
2608
2609         priv->phy = phy;
2610         priv->phy_ops = phy_ops;
2611         priv->dev = dev;
2612         if (fops != NULL)
2613                 priv->ops = fops;
2614         else
2615                 priv->ops = &pn533_std_frame_ops;
2616
2617         priv->protocol_type = protocol_type;
2618         priv->device_type = device_type;
2619
2620         mutex_init(&priv->cmd_lock);
2621
2622         INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2623         INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2624         INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2625         INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2626         INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2627         INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2628         INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2629         INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2630         INIT_WORK(&priv->rf_work, pn533_wq_rf);
2631         priv->wq = alloc_ordered_workqueue("pn533", 0);
2632         if (priv->wq == NULL)
2633                 goto error;
2634
2635         init_timer(&priv->listen_timer);
2636         priv->listen_timer.data = (unsigned long) priv;
2637         priv->listen_timer.function = pn533_listen_mode_timer;
2638
2639         skb_queue_head_init(&priv->resp_q);
2640         skb_queue_head_init(&priv->fragment_skb);
2641
2642         INIT_LIST_HEAD(&priv->cmd_queue);
2643
2644         priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2645                                            priv->ops->tx_header_len +
2646                                            PN533_CMD_DATAEXCH_HEAD_LEN,
2647                                            priv->ops->tx_tail_len);
2648         if (!priv->nfc_dev) {
2649                 rc = -ENOMEM;
2650                 goto destroy_wq;
2651         }
2652
2653         nfc_set_parent_dev(priv->nfc_dev, parent);
2654         nfc_set_drvdata(priv->nfc_dev, priv);
2655
2656         rc = nfc_register_device(priv->nfc_dev);
2657         if (rc)
2658                 goto free_nfc_dev;
2659
2660         return priv;
2661
2662 free_nfc_dev:
2663         nfc_free_device(priv->nfc_dev);
2664
2665 destroy_wq:
2666         destroy_workqueue(priv->wq);
2667 error:
2668         kfree(priv);
2669         return ERR_PTR(rc);
2670 }
2671 EXPORT_SYMBOL_GPL(pn533_register_device);
2672
2673 void pn533_unregister_device(struct pn533 *priv)
2674 {
2675         struct pn533_cmd *cmd, *n;
2676
2677         nfc_unregister_device(priv->nfc_dev);
2678         nfc_free_device(priv->nfc_dev);
2679
2680         flush_delayed_work(&priv->poll_work);
2681         destroy_workqueue(priv->wq);
2682
2683         skb_queue_purge(&priv->resp_q);
2684
2685         del_timer(&priv->listen_timer);
2686
2687         list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2688                 list_del(&cmd->queue);
2689                 kfree(cmd);
2690         }
2691
2692         kfree(priv);
2693 }
2694 EXPORT_SYMBOL_GPL(pn533_unregister_device);
2695
2696
2697 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
2698 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2699 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
2700 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2701 MODULE_VERSION(VERSION);
2702 MODULE_LICENSE("GPL");