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, *gb;
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(skb, 1) = PN533_INIT_TARGET_DEP;
1036
1037         /* MIFARE params */
1038         memcpy(skb_put(skb, 6), mifare_params, 6);
1039
1040         /* Felica params */
1041         felica = skb_put(skb, 18);
1042         memcpy(felica, felica_params, 18);
1043         get_random_bytes(felica + 2, 6);
1044
1045         /* NFCID3 */
1046         nfcid3 = skb_put(skb, 10);
1047         memset(nfcid3, 0, 10);
1048         memcpy(nfcid3, felica, 8);
1049
1050         /* General bytes */
1051         *skb_put(skb, 1) = gbytes_len;
1052
1053         gb = skb_put(skb, gbytes_len);
1054         memcpy(gb, gbytes, gbytes_len);
1055
1056         /* Len Tk */
1057         *skb_put(skb, 1) = 0;
1058
1059         return skb;
1060 }
1061
1062 static void pn533_wq_tm_mi_recv(struct work_struct *work);
1063 static struct sk_buff *pn533_build_response(struct pn533 *dev);
1064
1065 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1066                                       struct sk_buff *resp)
1067 {
1068         struct sk_buff *skb;
1069         u8 status, ret, mi;
1070         int rc;
1071
1072         dev_dbg(dev->dev, "%s\n", __func__);
1073
1074         if (IS_ERR(resp)) {
1075                 skb_queue_purge(&dev->resp_q);
1076                 return PTR_ERR(resp);
1077         }
1078
1079         status = resp->data[0];
1080
1081         ret = status & PN533_CMD_RET_MASK;
1082         mi = status & PN533_CMD_MI_MASK;
1083
1084         skb_pull(resp, sizeof(status));
1085
1086         if (ret != PN533_CMD_RET_SUCCESS) {
1087                 rc = -EIO;
1088                 goto error;
1089         }
1090
1091         skb_queue_tail(&dev->resp_q, resp);
1092
1093         if (mi) {
1094                 queue_work(dev->wq, &dev->mi_tm_rx_work);
1095                 return -EINPROGRESS;
1096         }
1097
1098         skb = pn533_build_response(dev);
1099         if (!skb) {
1100                 rc = -EIO;
1101                 goto error;
1102         }
1103
1104         return nfc_tm_data_received(dev->nfc_dev, skb);
1105
1106 error:
1107         nfc_tm_deactivated(dev->nfc_dev);
1108         dev->tgt_mode = 0;
1109         skb_queue_purge(&dev->resp_q);
1110         dev_kfree_skb(resp);
1111
1112         return rc;
1113 }
1114
1115 static void pn533_wq_tm_mi_recv(struct work_struct *work)
1116 {
1117         struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work);
1118         struct sk_buff *skb;
1119         int rc;
1120
1121         dev_dbg(dev->dev, "%s\n", __func__);
1122
1123         skb = pn533_alloc_skb(dev, 0);
1124         if (!skb)
1125                 return;
1126
1127         rc = pn533_send_cmd_direct_async(dev,
1128                                         PN533_CMD_TG_GET_DATA,
1129                                         skb,
1130                                         pn533_tm_get_data_complete,
1131                                         NULL);
1132
1133         if (rc < 0)
1134                 dev_kfree_skb(skb);
1135 }
1136
1137 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
1138                                   struct sk_buff *resp);
1139 static void pn533_wq_tm_mi_send(struct work_struct *work)
1140 {
1141         struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
1142         struct sk_buff *skb;
1143         int rc;
1144
1145         dev_dbg(dev->dev, "%s\n", __func__);
1146
1147         /* Grab the first skb in the queue */
1148         skb = skb_dequeue(&dev->fragment_skb);
1149         if (skb == NULL) {      /* No more data */
1150                 /* Reset the queue for future use */
1151                 skb_queue_head_init(&dev->fragment_skb);
1152                 goto error;
1153         }
1154
1155         /* last entry - remove MI bit */
1156         if (skb_queue_len(&dev->fragment_skb) == 0) {
1157                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
1158                                         skb, pn533_tm_send_complete, NULL);
1159         } else
1160                 rc = pn533_send_cmd_direct_async(dev,
1161                                         PN533_CMD_TG_SET_META_DATA,
1162                                         skb, pn533_tm_send_complete, NULL);
1163
1164         if (rc == 0) /* success */
1165                 return;
1166
1167         dev_err(dev->dev,
1168                 "Error %d when trying to perform set meta data_exchange", rc);
1169
1170         dev_kfree_skb(skb);
1171
1172 error:
1173         dev->phy_ops->send_ack(dev, GFP_KERNEL);
1174         queue_work(dev->wq, &dev->cmd_work);
1175 }
1176
1177 static void pn533_wq_tg_get_data(struct work_struct *work)
1178 {
1179         struct pn533 *dev = container_of(work, struct pn533, tg_work);
1180         struct sk_buff *skb;
1181         int rc;
1182
1183         dev_dbg(dev->dev, "%s\n", __func__);
1184
1185         skb = pn533_alloc_skb(dev, 0);
1186         if (!skb)
1187                 return;
1188
1189         rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1190                                    pn533_tm_get_data_complete, NULL);
1191
1192         if (rc < 0)
1193                 dev_kfree_skb(skb);
1194 }
1195
1196 #define ATR_REQ_GB_OFFSET 17
1197 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1198 {
1199         u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1200         size_t gb_len;
1201         int rc;
1202
1203         dev_dbg(dev->dev, "%s\n", __func__);
1204
1205         if (resp->len < ATR_REQ_GB_OFFSET + 1)
1206                 return -EINVAL;
1207
1208         mode = resp->data[0];
1209         cmd = &resp->data[1];
1210
1211         dev_dbg(dev->dev, "Target mode 0x%x len %d\n",
1212                 mode, resp->len);
1213
1214         if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1215             PN533_INIT_TARGET_RESP_ACTIVE)
1216                 comm_mode = NFC_COMM_ACTIVE;
1217
1218         if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0)  /* Only DEP supported */
1219                 return -EOPNOTSUPP;
1220
1221         gb = cmd + ATR_REQ_GB_OFFSET;
1222         gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1223
1224         rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1225                               comm_mode, gb, gb_len);
1226         if (rc < 0) {
1227                 nfc_err(dev->dev,
1228                         "Error when signaling target activation\n");
1229                 return rc;
1230         }
1231
1232         dev->tgt_mode = 1;
1233         queue_work(dev->wq, &dev->tg_work);
1234
1235         return 0;
1236 }
1237
1238 static void pn533_listen_mode_timer(unsigned long data)
1239 {
1240         struct pn533 *dev = (struct pn533 *)data;
1241
1242         dev_dbg(dev->dev, "Listen mode timeout\n");
1243
1244         dev->cancel_listen = 1;
1245
1246         pn533_poll_next_mod(dev);
1247
1248         queue_delayed_work(dev->wq, &dev->poll_work,
1249                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1250 }
1251
1252 static int pn533_rf_complete(struct pn533 *dev, void *arg,
1253                              struct sk_buff *resp)
1254 {
1255         int rc = 0;
1256
1257         dev_dbg(dev->dev, "%s\n", __func__);
1258
1259         if (IS_ERR(resp)) {
1260                 rc = PTR_ERR(resp);
1261
1262                 nfc_err(dev->dev, "RF setting error %d\n", rc);
1263
1264                 return rc;
1265         }
1266
1267         queue_delayed_work(dev->wq, &dev->poll_work,
1268                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1269
1270         dev_kfree_skb(resp);
1271         return rc;
1272 }
1273
1274 static void pn533_wq_rf(struct work_struct *work)
1275 {
1276         struct pn533 *dev = container_of(work, struct pn533, rf_work);
1277         struct sk_buff *skb;
1278         int rc;
1279
1280         dev_dbg(dev->dev, "%s\n", __func__);
1281
1282         skb = pn533_alloc_skb(dev, 2);
1283         if (!skb)
1284                 return;
1285
1286         *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD;
1287         *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
1288
1289         rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1290                                   pn533_rf_complete, NULL);
1291         if (rc < 0) {
1292                 dev_kfree_skb(skb);
1293                 nfc_err(dev->dev, "RF setting error %d\n", rc);
1294         }
1295 }
1296
1297 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg,
1298                                    struct sk_buff *resp)
1299 {
1300         struct pn533_cmd_jump_dep_response *rsp;
1301         struct nfc_target nfc_target;
1302         u8 target_gt_len;
1303         int rc;
1304
1305         if (IS_ERR(resp))
1306                 return PTR_ERR(resp);
1307
1308         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1309
1310         rc = rsp->status & PN533_CMD_RET_MASK;
1311         if (rc != PN533_CMD_RET_SUCCESS) {
1312                 /* Not target found, turn radio off */
1313                 queue_work(dev->wq, &dev->rf_work);
1314
1315                 dev_kfree_skb(resp);
1316                 return 0;
1317         }
1318
1319         dev_dbg(dev->dev, "Creating new target");
1320
1321         nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1322         nfc_target.nfcid1_len = 10;
1323         memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1324         rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1325         if (rc)
1326                 goto error;
1327
1328         dev->tgt_available_prots = 0;
1329         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1330
1331         /* ATR_RES general bytes are located at offset 17 */
1332         target_gt_len = resp->len - 17;
1333         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1334                                           rsp->gt, target_gt_len);
1335         if (!rc) {
1336                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1337                                         dev->nfc_dev->targets[0].idx,
1338                                         0, NFC_RF_INITIATOR);
1339
1340                 if (!rc)
1341                         pn533_poll_reset_mod_list(dev);
1342         }
1343 error:
1344         dev_kfree_skb(resp);
1345         return rc;
1346 }
1347
1348 #define PASSIVE_DATA_LEN 5
1349 static int pn533_poll_dep(struct nfc_dev *nfc_dev)
1350 {
1351         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1352         struct sk_buff *skb;
1353         int rc, skb_len;
1354         u8 *next, nfcid3[NFC_NFCID3_MAXSIZE];
1355         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1356
1357         dev_dbg(dev->dev, "%s", __func__);
1358
1359         if (!dev->gb) {
1360                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1361
1362                 if (!dev->gb || !dev->gb_len) {
1363                         dev->poll_dep = 0;
1364                         queue_work(dev->wq, &dev->rf_work);
1365                 }
1366         }
1367
1368         skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1369         skb_len += PASSIVE_DATA_LEN;
1370
1371         /* NFCID3 */
1372         skb_len += NFC_NFCID3_MAXSIZE;
1373         nfcid3[0] = 0x1;
1374         nfcid3[1] = 0xfe;
1375         get_random_bytes(nfcid3 + 2, 6);
1376
1377         skb = pn533_alloc_skb(dev, skb_len);
1378         if (!skb)
1379                 return -ENOMEM;
1380
1381         *skb_put(skb, 1) = 0x01;  /* Active */
1382         *skb_put(skb, 1) = 0x02;  /* 424 kbps */
1383
1384         next = skb_put(skb, 1);  /* Next */
1385         *next = 0;
1386
1387         /* Copy passive data */
1388         memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
1389         *next |= 1;
1390
1391         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1392         memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
1393                NFC_NFCID3_MAXSIZE);
1394         *next |= 2;
1395
1396         memcpy(skb_put(skb, dev->gb_len), dev->gb, dev->gb_len);
1397         *next |= 4; /* We have some Gi */
1398
1399         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1400                                   pn533_poll_dep_complete, NULL);
1401
1402         if (rc < 0)
1403                 dev_kfree_skb(skb);
1404
1405         return rc;
1406 }
1407
1408 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1409                                struct sk_buff *resp)
1410 {
1411         struct pn533_poll_modulations *cur_mod;
1412         int rc;
1413
1414         dev_dbg(dev->dev, "%s\n", __func__);
1415
1416         if (IS_ERR(resp)) {
1417                 rc = PTR_ERR(resp);
1418
1419                 nfc_err(dev->dev, "%s  Poll complete error %d\n",
1420                         __func__, rc);
1421
1422                 if (rc == -ENOENT) {
1423                         if (dev->poll_mod_count != 0)
1424                                 return rc;
1425                         goto stop_poll;
1426                 } else if (rc < 0) {
1427                         nfc_err(dev->dev,
1428                                 "Error %d when running poll\n", rc);
1429                         goto stop_poll;
1430                 }
1431         }
1432
1433         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1434
1435         if (cur_mod->len == 0) { /* Target mode */
1436                 del_timer(&dev->listen_timer);
1437                 rc = pn533_init_target_complete(dev, resp);
1438                 goto done;
1439         }
1440
1441         /* Initiator mode */
1442         rc = pn533_start_poll_complete(dev, resp);
1443         if (!rc)
1444                 goto done;
1445
1446         if (!dev->poll_mod_count) {
1447                 dev_dbg(dev->dev, "Polling has been stopped\n");
1448                 goto done;
1449         }
1450
1451         pn533_poll_next_mod(dev);
1452         /* Not target found, turn radio off */
1453         queue_work(dev->wq, &dev->rf_work);
1454
1455 done:
1456         dev_kfree_skb(resp);
1457         return rc;
1458
1459 stop_poll:
1460         nfc_err(dev->dev, "Polling operation has been stopped\n");
1461
1462         pn533_poll_reset_mod_list(dev);
1463         dev->poll_protocols = 0;
1464         return rc;
1465 }
1466
1467 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1468                                         struct pn533_poll_modulations *mod)
1469 {
1470         struct sk_buff *skb;
1471
1472         skb = pn533_alloc_skb(dev, mod->len);
1473         if (!skb)
1474                 return NULL;
1475
1476         memcpy(skb_put(skb, mod->len), &mod->data, mod->len);
1477
1478         return skb;
1479 }
1480
1481 static int pn533_send_poll_frame(struct pn533 *dev)
1482 {
1483         struct pn533_poll_modulations *mod;
1484         struct sk_buff *skb;
1485         int rc;
1486         u8 cmd_code;
1487
1488         mod = dev->poll_mod_active[dev->poll_mod_curr];
1489
1490         dev_dbg(dev->dev, "%s mod len %d\n",
1491                 __func__, mod->len);
1492
1493         if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep)  {
1494                 dev->poll_dep = 0;
1495                 return pn533_poll_dep(dev->nfc_dev);
1496         }
1497
1498         if (mod->len == 0) {  /* Listen mode */
1499                 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1500                 skb = pn533_alloc_poll_tg_frame(dev);
1501         } else {  /* Polling mode */
1502                 cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
1503                 skb = pn533_alloc_poll_in_frame(dev, mod);
1504         }
1505
1506         if (!skb) {
1507                 nfc_err(dev->dev, "Failed to allocate skb\n");
1508                 return -ENOMEM;
1509         }
1510
1511         rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1512                                   NULL);
1513         if (rc < 0) {
1514                 dev_kfree_skb(skb);
1515                 nfc_err(dev->dev, "Polling loop error %d\n", rc);
1516         }
1517
1518         return rc;
1519 }
1520
1521 static void pn533_wq_poll(struct work_struct *work)
1522 {
1523         struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1524         struct pn533_poll_modulations *cur_mod;
1525         int rc;
1526
1527         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1528
1529         dev_dbg(dev->dev,
1530                 "%s cancel_listen %d modulation len %d\n",
1531                 __func__, dev->cancel_listen, cur_mod->len);
1532
1533         if (dev->cancel_listen == 1) {
1534                 dev->cancel_listen = 0;
1535                 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC);
1536         }
1537
1538         rc = pn533_send_poll_frame(dev);
1539         if (rc)
1540                 return;
1541
1542         if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1543                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1544 }
1545
1546 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1547                             u32 im_protocols, u32 tm_protocols)
1548 {
1549         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1550         struct pn533_poll_modulations *cur_mod;
1551         u8 rand_mod;
1552         int rc;
1553
1554         dev_dbg(dev->dev,
1555                 "%s: im protocols 0x%x tm protocols 0x%x\n",
1556                 __func__, im_protocols, tm_protocols);
1557
1558         if (dev->tgt_active_prot) {
1559                 nfc_err(dev->dev,
1560                         "Cannot poll with a target already activated\n");
1561                 return -EBUSY;
1562         }
1563
1564         if (dev->tgt_mode) {
1565                 nfc_err(dev->dev,
1566                         "Cannot poll while already being activated\n");
1567                 return -EBUSY;
1568         }
1569
1570         if (tm_protocols) {
1571                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1572                 if (dev->gb == NULL)
1573                         tm_protocols = 0;
1574         }
1575
1576         pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1577         dev->poll_protocols = im_protocols;
1578         dev->listen_protocols = tm_protocols;
1579
1580         /* Do not always start polling from the same modulation */
1581         get_random_bytes(&rand_mod, sizeof(rand_mod));
1582         rand_mod %= dev->poll_mod_count;
1583         dev->poll_mod_curr = rand_mod;
1584
1585         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1586
1587         rc = pn533_send_poll_frame(dev);
1588
1589         /* Start listen timer */
1590         if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
1591                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1592
1593         return rc;
1594 }
1595
1596 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1597 {
1598         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1599
1600         del_timer(&dev->listen_timer);
1601
1602         if (!dev->poll_mod_count) {
1603                 dev_dbg(dev->dev,
1604                         "Polling operation was not running\n");
1605                 return;
1606         }
1607
1608         dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1609         flush_delayed_work(&dev->poll_work);
1610         pn533_poll_reset_mod_list(dev);
1611 }
1612
1613 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1614 {
1615         struct pn533_cmd_activate_response *rsp;
1616         u16 gt_len;
1617         int rc;
1618         struct sk_buff *skb;
1619         struct sk_buff *resp;
1620
1621         dev_dbg(dev->dev, "%s\n", __func__);
1622
1623         skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1624         if (!skb)
1625                 return -ENOMEM;
1626
1627         *skb_put(skb, sizeof(u8)) = 1; /* TG */
1628         *skb_put(skb, sizeof(u8)) = 0; /* Next */
1629
1630         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1631         if (IS_ERR(resp))
1632                 return PTR_ERR(resp);
1633
1634         rsp = (struct pn533_cmd_activate_response *)resp->data;
1635         rc = rsp->status & PN533_CMD_RET_MASK;
1636         if (rc != PN533_CMD_RET_SUCCESS) {
1637                 nfc_err(dev->dev,
1638                         "Target activation failed (error 0x%x)\n", rc);
1639                 dev_kfree_skb(resp);
1640                 return -EIO;
1641         }
1642
1643         /* ATR_RES general bytes are located at offset 16 */
1644         gt_len = resp->len - 16;
1645         rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1646
1647         dev_kfree_skb(resp);
1648         return rc;
1649 }
1650
1651 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1652                                  struct nfc_target *target, u32 protocol)
1653 {
1654         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1655         int rc;
1656
1657         dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol);
1658
1659         if (dev->poll_mod_count) {
1660                 nfc_err(dev->dev,
1661                         "Cannot activate while polling\n");
1662                 return -EBUSY;
1663         }
1664
1665         if (dev->tgt_active_prot) {
1666                 nfc_err(dev->dev,
1667                         "There is already an active target\n");
1668                 return -EBUSY;
1669         }
1670
1671         if (!dev->tgt_available_prots) {
1672                 nfc_err(dev->dev,
1673                         "There is no available target to activate\n");
1674                 return -EINVAL;
1675         }
1676
1677         if (!(dev->tgt_available_prots & (1 << protocol))) {
1678                 nfc_err(dev->dev,
1679                         "Target doesn't support requested proto %u\n",
1680                         protocol);
1681                 return -EINVAL;
1682         }
1683
1684         if (protocol == NFC_PROTO_NFC_DEP) {
1685                 rc = pn533_activate_target_nfcdep(dev);
1686                 if (rc) {
1687                         nfc_err(dev->dev,
1688                                 "Activating target with DEP failed %d\n", rc);
1689                         return rc;
1690                 }
1691         }
1692
1693         dev->tgt_active_prot = protocol;
1694         dev->tgt_available_prots = 0;
1695
1696         return 0;
1697 }
1698
1699 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg,
1700                              struct sk_buff *resp)
1701 {
1702         int rc = 0;
1703
1704         dev_dbg(dev->dev, "%s\n", __func__);
1705
1706         if (IS_ERR(resp)) {
1707                 rc = PTR_ERR(resp);
1708
1709                 nfc_err(dev->dev, "Target release error %d\n", rc);
1710
1711                 return rc;
1712         }
1713
1714         rc = resp->data[0] & PN533_CMD_RET_MASK;
1715         if (rc != PN533_CMD_RET_SUCCESS)
1716                 nfc_err(dev->dev,
1717                         "Error 0x%x when releasing the target\n", rc);
1718
1719         dev_kfree_skb(resp);
1720         return rc;
1721 }
1722
1723 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1724                                     struct nfc_target *target, u8 mode)
1725 {
1726         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1727         struct sk_buff *skb;
1728         int rc;
1729
1730         dev_dbg(dev->dev, "%s\n", __func__);
1731
1732         if (!dev->tgt_active_prot) {
1733                 nfc_err(dev->dev, "There is no active target\n");
1734                 return;
1735         }
1736
1737         dev->tgt_active_prot = 0;
1738         skb_queue_purge(&dev->resp_q);
1739
1740         skb = pn533_alloc_skb(dev, sizeof(u8));
1741         if (!skb)
1742                 return;
1743
1744         *skb_put(skb, 1) = 1; /* TG*/
1745
1746         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb,
1747                                   pn533_deactivate_target_complete, NULL);
1748         if (rc < 0) {
1749                 dev_kfree_skb(skb);
1750                 nfc_err(dev->dev, "Target release error %d\n", rc);
1751         }
1752 }
1753
1754
1755 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1756                                          struct sk_buff *resp)
1757 {
1758         struct pn533_cmd_jump_dep_response *rsp;
1759         u8 target_gt_len;
1760         int rc;
1761         u8 active = *(u8 *)arg;
1762
1763         kfree(arg);
1764
1765         if (IS_ERR(resp))
1766                 return PTR_ERR(resp);
1767
1768         if (dev->tgt_available_prots &&
1769             !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1770                 nfc_err(dev->dev,
1771                         "The target does not support DEP\n");
1772                 rc =  -EINVAL;
1773                 goto error;
1774         }
1775
1776         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1777
1778         rc = rsp->status & PN533_CMD_RET_MASK;
1779         if (rc != PN533_CMD_RET_SUCCESS) {
1780                 nfc_err(dev->dev,
1781                         "Bringing DEP link up failed (error 0x%x)\n", rc);
1782                 goto error;
1783         }
1784
1785         if (!dev->tgt_available_prots) {
1786                 struct nfc_target nfc_target;
1787
1788                 dev_dbg(dev->dev, "Creating new target\n");
1789
1790                 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1791                 nfc_target.nfcid1_len = 10;
1792                 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1793                 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1794                 if (rc)
1795                         goto error;
1796
1797                 dev->tgt_available_prots = 0;
1798         }
1799
1800         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1801
1802         /* ATR_RES general bytes are located at offset 17 */
1803         target_gt_len = resp->len - 17;
1804         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1805                                           rsp->gt, target_gt_len);
1806         if (rc == 0)
1807                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1808                                         dev->nfc_dev->targets[0].idx,
1809                                         !active, NFC_RF_INITIATOR);
1810
1811 error:
1812         dev_kfree_skb(resp);
1813         return rc;
1814 }
1815
1816 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
1817 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1818                              u8 comm_mode, u8 *gb, size_t gb_len)
1819 {
1820         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1821         struct sk_buff *skb;
1822         int rc, skb_len;
1823         u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
1824         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1825
1826         dev_dbg(dev->dev, "%s\n", __func__);
1827
1828         if (dev->poll_mod_count) {
1829                 nfc_err(dev->dev,
1830                         "Cannot bring the DEP link up while polling\n");
1831                 return -EBUSY;
1832         }
1833
1834         if (dev->tgt_active_prot) {
1835                 nfc_err(dev->dev,
1836                         "There is already an active target\n");
1837                 return -EBUSY;
1838         }
1839
1840         skb_len = 3 + gb_len; /* ActPass + BR + Next */
1841         skb_len += PASSIVE_DATA_LEN;
1842
1843         /* NFCID3 */
1844         skb_len += NFC_NFCID3_MAXSIZE;
1845         if (target && !target->nfcid2_len) {
1846                 nfcid3[0] = 0x1;
1847                 nfcid3[1] = 0xfe;
1848                 get_random_bytes(nfcid3 + 2, 6);
1849         }
1850
1851         skb = pn533_alloc_skb(dev, skb_len);
1852         if (!skb)
1853                 return -ENOMEM;
1854
1855         *skb_put(skb, 1) = !comm_mode;  /* ActPass */
1856         *skb_put(skb, 1) = 0x02;  /* 424 kbps */
1857
1858         next = skb_put(skb, 1);  /* Next */
1859         *next = 0;
1860
1861         /* Copy passive data */
1862         memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
1863         *next |= 1;
1864
1865         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1866         if (target && target->nfcid2_len)
1867                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
1868                        target->nfcid2_len);
1869         else
1870                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
1871                        NFC_NFCID3_MAXSIZE);
1872         *next |= 2;
1873
1874         if (gb != NULL && gb_len > 0) {
1875                 memcpy(skb_put(skb, gb_len), gb, gb_len);
1876                 *next |= 4; /* We have some Gi */
1877         } else {
1878                 *next = 0;
1879         }
1880
1881         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
1882         if (!arg) {
1883                 dev_kfree_skb(skb);
1884                 return -ENOMEM;
1885         }
1886
1887         *arg = !comm_mode;
1888
1889         pn533_rf_field(dev->nfc_dev, 0);
1890
1891         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1892                                   pn533_in_dep_link_up_complete, arg);
1893
1894         if (rc < 0) {
1895                 dev_kfree_skb(skb);
1896                 kfree(arg);
1897         }
1898
1899         return rc;
1900 }
1901
1902 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
1903 {
1904         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1905
1906         dev_dbg(dev->dev, "%s\n", __func__);
1907
1908         pn533_poll_reset_mod_list(dev);
1909
1910         if (dev->tgt_mode || dev->tgt_active_prot)
1911                 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1912
1913         dev->tgt_active_prot = 0;
1914         dev->tgt_mode = 0;
1915
1916         skb_queue_purge(&dev->resp_q);
1917
1918         return 0;
1919 }
1920
1921 struct pn533_data_exchange_arg {
1922         data_exchange_cb_t cb;
1923         void *cb_context;
1924 };
1925
1926 static struct sk_buff *pn533_build_response(struct pn533 *dev)
1927 {
1928         struct sk_buff *skb, *tmp, *t;
1929         unsigned int skb_len = 0, tmp_len = 0;
1930
1931         dev_dbg(dev->dev, "%s\n", __func__);
1932
1933         if (skb_queue_empty(&dev->resp_q))
1934                 return NULL;
1935
1936         if (skb_queue_len(&dev->resp_q) == 1) {
1937                 skb = skb_dequeue(&dev->resp_q);
1938                 goto out;
1939         }
1940
1941         skb_queue_walk_safe(&dev->resp_q, tmp, t)
1942                 skb_len += tmp->len;
1943
1944         dev_dbg(dev->dev, "%s total length %d\n",
1945                 __func__, skb_len);
1946
1947         skb = alloc_skb(skb_len, GFP_KERNEL);
1948         if (skb == NULL)
1949                 goto out;
1950
1951         skb_put(skb, skb_len);
1952
1953         skb_queue_walk_safe(&dev->resp_q, tmp, t) {
1954                 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
1955                 tmp_len += tmp->len;
1956         }
1957
1958 out:
1959         skb_queue_purge(&dev->resp_q);
1960
1961         return skb;
1962 }
1963
1964 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
1965                                         struct sk_buff *resp)
1966 {
1967         struct pn533_data_exchange_arg *arg = _arg;
1968         struct sk_buff *skb;
1969         int rc = 0;
1970         u8 status, ret, mi;
1971
1972         dev_dbg(dev->dev, "%s\n", __func__);
1973
1974         if (IS_ERR(resp)) {
1975                 rc = PTR_ERR(resp);
1976                 goto _error;
1977         }
1978
1979         status = resp->data[0];
1980         ret = status & PN533_CMD_RET_MASK;
1981         mi = status & PN533_CMD_MI_MASK;
1982
1983         skb_pull(resp, sizeof(status));
1984
1985         if (ret != PN533_CMD_RET_SUCCESS) {
1986                 nfc_err(dev->dev,
1987                         "Exchanging data failed (error 0x%x)\n", ret);
1988                 rc = -EIO;
1989                 goto error;
1990         }
1991
1992         skb_queue_tail(&dev->resp_q, resp);
1993
1994         if (mi) {
1995                 dev->cmd_complete_mi_arg = arg;
1996                 queue_work(dev->wq, &dev->mi_rx_work);
1997                 return -EINPROGRESS;
1998         }
1999
2000         /* Prepare for the next round */
2001         if (skb_queue_len(&dev->fragment_skb) > 0) {
2002                 dev->cmd_complete_dep_arg = arg;
2003                 queue_work(dev->wq, &dev->mi_tx_work);
2004
2005                 return -EINPROGRESS;
2006         }
2007
2008         skb = pn533_build_response(dev);
2009         if (!skb) {
2010                 rc = -ENOMEM;
2011                 goto error;
2012         }
2013
2014         arg->cb(arg->cb_context, skb, 0);
2015         kfree(arg);
2016         return 0;
2017
2018 error:
2019         dev_kfree_skb(resp);
2020 _error:
2021         skb_queue_purge(&dev->resp_q);
2022         arg->cb(arg->cb_context, NULL, rc);
2023         kfree(arg);
2024         return rc;
2025 }
2026
2027 /*
2028  * Receive an incoming pn533 frame. skb contains only header and payload.
2029  * If skb == NULL, it is a notification that the link below is dead.
2030  */
2031 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2032 {
2033         if (!dev->cmd)
2034                 goto sched_wq;
2035
2036         dev->cmd->status = status;
2037
2038         if (status != 0) {
2039                 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2040                 goto sched_wq;
2041         }
2042
2043         if (skb == NULL) {
2044                 pr_err("NULL Frame -> link is dead\n");
2045                 goto sched_wq;
2046         }
2047
2048         if (pn533_rx_frame_is_ack(skb->data)) {
2049                 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2050                 dev_kfree_skb(skb);
2051                 return;
2052         }
2053
2054         print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2055                              dev->ops->rx_frame_size(skb->data), false);
2056
2057         if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2058                 nfc_err(dev->dev, "Received an invalid frame\n");
2059                 dev->cmd->status = -EIO;
2060         } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2061                 nfc_err(dev->dev, "It it not the response to the last command\n");
2062                 dev->cmd->status = -EIO;
2063         }
2064
2065         dev->cmd->resp = skb;
2066
2067 sched_wq:
2068         queue_work(dev->wq, &dev->cmd_complete_work);
2069 }
2070 EXPORT_SYMBOL(pn533_recv_frame);
2071
2072 /* Split the Tx skb into small chunks */
2073 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2074 {
2075         struct sk_buff *frag;
2076         int  frag_size;
2077
2078         do {
2079                 /* Remaining size */
2080                 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2081                         frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2082                 else
2083                         frag_size = skb->len;
2084
2085                 /* Allocate and reserve */
2086                 frag = pn533_alloc_skb(dev, frag_size);
2087                 if (!frag) {
2088                         skb_queue_purge(&dev->fragment_skb);
2089                         break;
2090                 }
2091
2092                 if (!dev->tgt_mode) {
2093                         /* Reserve the TG/MI byte */
2094                         skb_reserve(frag, 1);
2095
2096                         /* MI + TG */
2097                         if (frag_size  == PN533_CMD_DATAFRAME_MAXLEN)
2098                                 *skb_push(frag, sizeof(u8)) =
2099                                                         (PN533_CMD_MI_MASK | 1);
2100                         else
2101                                 *skb_push(frag, sizeof(u8)) =  1; /* TG */
2102                 }
2103
2104                 memcpy(skb_put(frag, frag_size), skb->data, frag_size);
2105
2106                 /* Reduce the size of incoming buffer */
2107                 skb_pull(skb, frag_size);
2108
2109                 /* Add this to skb_queue */
2110                 skb_queue_tail(&dev->fragment_skb, frag);
2111
2112         } while (skb->len > 0);
2113
2114         dev_kfree_skb(skb);
2115
2116         return skb_queue_len(&dev->fragment_skb);
2117 }
2118
2119 static int pn533_transceive(struct nfc_dev *nfc_dev,
2120                             struct nfc_target *target, struct sk_buff *skb,
2121                             data_exchange_cb_t cb, void *cb_context)
2122 {
2123         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2124         struct pn533_data_exchange_arg *arg = NULL;
2125         int rc;
2126
2127         dev_dbg(dev->dev, "%s\n", __func__);
2128
2129         if (!dev->tgt_active_prot) {
2130                 nfc_err(dev->dev,
2131                         "Can't exchange data if there is no active target\n");
2132                 rc = -EINVAL;
2133                 goto error;
2134         }
2135
2136         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2137         if (!arg) {
2138                 rc = -ENOMEM;
2139                 goto error;
2140         }
2141
2142         arg->cb = cb;
2143         arg->cb_context = cb_context;
2144
2145         switch (dev->device_type) {
2146         case PN533_DEVICE_PASORI:
2147                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2148                         rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2149                                                    skb,
2150                                                    pn533_data_exchange_complete,
2151                                                    arg);
2152
2153                         break;
2154                 }
2155         default:
2156                 /* jumbo frame ? */
2157                 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2158                         rc = pn533_fill_fragment_skbs(dev, skb);
2159                         if (rc <= 0)
2160                                 goto error;
2161
2162                         skb = skb_dequeue(&dev->fragment_skb);
2163                         if (!skb) {
2164                                 rc = -EIO;
2165                                 goto error;
2166                         }
2167                 } else {
2168                         *skb_push(skb, sizeof(u8)) =  1; /* TG */
2169                 }
2170
2171                 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2172                                            skb, pn533_data_exchange_complete,
2173                                            arg);
2174
2175                 break;
2176         }
2177
2178         if (rc < 0) /* rc from send_async */
2179                 goto error;
2180
2181         return 0;
2182
2183 error:
2184         kfree(arg);
2185         dev_kfree_skb(skb);
2186         return rc;
2187 }
2188
2189 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2190                                   struct sk_buff *resp)
2191 {
2192         u8 status;
2193
2194         dev_dbg(dev->dev, "%s\n", __func__);
2195
2196         if (IS_ERR(resp))
2197                 return PTR_ERR(resp);
2198
2199         status = resp->data[0];
2200
2201         /* Prepare for the next round */
2202         if (skb_queue_len(&dev->fragment_skb) > 0) {
2203                 queue_work(dev->wq, &dev->mi_tm_tx_work);
2204                 return -EINPROGRESS;
2205         }
2206         dev_kfree_skb(resp);
2207
2208         if (status != 0) {
2209                 nfc_tm_deactivated(dev->nfc_dev);
2210
2211                 dev->tgt_mode = 0;
2212
2213                 return 0;
2214         }
2215
2216         queue_work(dev->wq, &dev->tg_work);
2217
2218         return 0;
2219 }
2220
2221 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2222 {
2223         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2224         int rc;
2225
2226         dev_dbg(dev->dev, "%s\n", __func__);
2227
2228         /* let's split in multiple chunks if size's too big */
2229         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2230                 rc = pn533_fill_fragment_skbs(dev, skb);
2231                 if (rc <= 0)
2232                         goto error;
2233
2234                 /* get the first skb */
2235                 skb = skb_dequeue(&dev->fragment_skb);
2236                 if (!skb) {
2237                         rc = -EIO;
2238                         goto error;
2239                 }
2240
2241                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2242                                                 pn533_tm_send_complete, NULL);
2243         } else {
2244                 /* Send th skb */
2245                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2246                                                 pn533_tm_send_complete, NULL);
2247         }
2248
2249 error:
2250         if (rc < 0) {
2251                 dev_kfree_skb(skb);
2252                 skb_queue_purge(&dev->fragment_skb);
2253         }
2254
2255         return rc;
2256 }
2257
2258 static void pn533_wq_mi_recv(struct work_struct *work)
2259 {
2260         struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2261         struct sk_buff *skb;
2262         int rc;
2263
2264         dev_dbg(dev->dev, "%s\n", __func__);
2265
2266         skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2267         if (!skb)
2268                 goto error;
2269
2270         switch (dev->device_type) {
2271         case PN533_DEVICE_PASORI:
2272                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2273                         rc = pn533_send_cmd_direct_async(dev,
2274                                                 PN533_CMD_IN_COMM_THRU,
2275                                                 skb,
2276                                                 pn533_data_exchange_complete,
2277                                                  dev->cmd_complete_mi_arg);
2278
2279                         break;
2280                 }
2281         default:
2282                 *skb_put(skb, sizeof(u8)) =  1; /*TG*/
2283
2284                 rc = pn533_send_cmd_direct_async(dev,
2285                                                  PN533_CMD_IN_DATA_EXCHANGE,
2286                                                  skb,
2287                                                  pn533_data_exchange_complete,
2288                                                  dev->cmd_complete_mi_arg);
2289
2290                 break;
2291         }
2292
2293         if (rc == 0) /* success */
2294                 return;
2295
2296         nfc_err(dev->dev,
2297                 "Error %d when trying to perform data_exchange\n", rc);
2298
2299         dev_kfree_skb(skb);
2300         kfree(dev->cmd_complete_mi_arg);
2301
2302 error:
2303         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2304         queue_work(dev->wq, &dev->cmd_work);
2305 }
2306
2307 static void pn533_wq_mi_send(struct work_struct *work)
2308 {
2309         struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2310         struct sk_buff *skb;
2311         int rc;
2312
2313         dev_dbg(dev->dev, "%s\n", __func__);
2314
2315         /* Grab the first skb in the queue */
2316         skb = skb_dequeue(&dev->fragment_skb);
2317
2318         if (skb == NULL) {      /* No more data */
2319                 /* Reset the queue for future use */
2320                 skb_queue_head_init(&dev->fragment_skb);
2321                 goto error;
2322         }
2323
2324         switch (dev->device_type) {
2325         case PN533_DEVICE_PASORI:
2326                 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2327                         rc = -EIO;
2328                         break;
2329                 }
2330
2331                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2332                                                  skb,
2333                                                  pn533_data_exchange_complete,
2334                                                  dev->cmd_complete_dep_arg);
2335
2336                 break;
2337
2338         default:
2339                 /* Still some fragments? */
2340                 rc = pn533_send_cmd_direct_async(dev,
2341                                                  PN533_CMD_IN_DATA_EXCHANGE,
2342                                                  skb,
2343                                                  pn533_data_exchange_complete,
2344                                                  dev->cmd_complete_dep_arg);
2345
2346                 break;
2347         }
2348
2349         if (rc == 0) /* success */
2350                 return;
2351
2352         nfc_err(dev->dev,
2353                 "Error %d when trying to perform data_exchange\n", rc);
2354
2355         dev_kfree_skb(skb);
2356         kfree(dev->cmd_complete_dep_arg);
2357
2358 error:
2359         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2360         queue_work(dev->wq, &dev->cmd_work);
2361 }
2362
2363 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2364                                                                 u8 cfgdata_len)
2365 {
2366         struct sk_buff *skb;
2367         struct sk_buff *resp;
2368         int skb_len;
2369
2370         dev_dbg(dev->dev, "%s\n", __func__);
2371
2372         skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2373
2374         skb = pn533_alloc_skb(dev, skb_len);
2375         if (!skb)
2376                 return -ENOMEM;
2377
2378         *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2379         memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2380
2381         resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2382         if (IS_ERR(resp))
2383                 return PTR_ERR(resp);
2384
2385         dev_kfree_skb(resp);
2386         return 0;
2387 }
2388
2389 static int pn533_get_firmware_version(struct pn533 *dev,
2390                                       struct pn533_fw_version *fv)
2391 {
2392         struct sk_buff *skb;
2393         struct sk_buff *resp;
2394
2395         skb = pn533_alloc_skb(dev, 0);
2396         if (!skb)
2397                 return -ENOMEM;
2398
2399         resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2400         if (IS_ERR(resp))
2401                 return PTR_ERR(resp);
2402
2403         fv->ic = resp->data[0];
2404         fv->ver = resp->data[1];
2405         fv->rev = resp->data[2];
2406         fv->support = resp->data[3];
2407
2408         dev_kfree_skb(resp);
2409         return 0;
2410 }
2411
2412 static int pn533_pasori_fw_reset(struct pn533 *dev)
2413 {
2414         struct sk_buff *skb;
2415         struct sk_buff *resp;
2416
2417         dev_dbg(dev->dev, "%s\n", __func__);
2418
2419         skb = pn533_alloc_skb(dev, sizeof(u8));
2420         if (!skb)
2421                 return -ENOMEM;
2422
2423         *skb_put(skb, sizeof(u8)) = 0x1;
2424
2425         resp = pn533_send_cmd_sync(dev, 0x18, skb);
2426         if (IS_ERR(resp))
2427                 return PTR_ERR(resp);
2428
2429         dev_kfree_skb(resp);
2430
2431         return 0;
2432 }
2433
2434 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2435 {
2436         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2437         u8 rf_field = !!rf;
2438         int rc;
2439
2440         rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2441
2442         rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2443                                      (u8 *)&rf_field, 1);
2444         if (rc) {
2445                 nfc_err(dev->dev, "Error on setting RF field\n");
2446                 return rc;
2447         }
2448
2449         return rc;
2450 }
2451
2452 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2453 {
2454         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2455         struct sk_buff *skb;
2456         struct sk_buff *resp;
2457
2458         skb = pn533_alloc_skb(dev, 1);
2459         if (!skb)
2460                 return -ENOMEM;
2461
2462         *skb_put(skb, 1) = 0x01;
2463
2464         resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2465         if (IS_ERR(resp))
2466                 return PTR_ERR(resp);
2467
2468         dev_kfree_skb(resp);
2469         return 0;
2470 }
2471
2472 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2473 {
2474         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2475
2476         if (dev->device_type == PN533_DEVICE_PN532) {
2477                 int rc = pn532_sam_configuration(nfc_dev);
2478
2479                 if (rc)
2480                         return rc;
2481         }
2482
2483         return pn533_rf_field(nfc_dev, 1);
2484 }
2485
2486 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2487 {
2488         return pn533_rf_field(nfc_dev, 0);
2489 }
2490
2491 static struct nfc_ops pn533_nfc_ops = {
2492         .dev_up = pn533_dev_up,
2493         .dev_down = pn533_dev_down,
2494         .dep_link_up = pn533_dep_link_up,
2495         .dep_link_down = pn533_dep_link_down,
2496         .start_poll = pn533_start_poll,
2497         .stop_poll = pn533_stop_poll,
2498         .activate_target = pn533_activate_target,
2499         .deactivate_target = pn533_deactivate_target,
2500         .im_transceive = pn533_transceive,
2501         .tm_send = pn533_tm_send,
2502 };
2503
2504 static int pn533_setup(struct pn533 *dev)
2505 {
2506         struct pn533_config_max_retries max_retries;
2507         struct pn533_config_timing timing;
2508         u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2509         int rc;
2510
2511         switch (dev->device_type) {
2512         case PN533_DEVICE_STD:
2513         case PN533_DEVICE_PASORI:
2514         case PN533_DEVICE_ACR122U:
2515         case PN533_DEVICE_PN532:
2516                 max_retries.mx_rty_atr = 0x2;
2517                 max_retries.mx_rty_psl = 0x1;
2518                 max_retries.mx_rty_passive_act =
2519                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2520
2521                 timing.rfu = PN533_CONFIG_TIMING_102;
2522                 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2523                 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2524
2525                 break;
2526
2527         default:
2528                 nfc_err(dev->dev, "Unknown device type %d\n",
2529                         dev->device_type);
2530                 return -EINVAL;
2531         }
2532
2533         rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2534                                      (u8 *)&max_retries, sizeof(max_retries));
2535         if (rc) {
2536                 nfc_err(dev->dev,
2537                         "Error on setting MAX_RETRIES config\n");
2538                 return rc;
2539         }
2540
2541
2542         rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2543                                      (u8 *)&timing, sizeof(timing));
2544         if (rc) {
2545                 nfc_err(dev->dev, "Error on setting RF timings\n");
2546                 return rc;
2547         }
2548
2549         switch (dev->device_type) {
2550         case PN533_DEVICE_STD:
2551         case PN533_DEVICE_PN532:
2552                 break;
2553
2554         case PN533_DEVICE_PASORI:
2555                 pn533_pasori_fw_reset(dev);
2556
2557                 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2558                                              pasori_cfg, 3);
2559                 if (rc) {
2560                         nfc_err(dev->dev,
2561                                 "Error while settings PASORI config\n");
2562                         return rc;
2563                 }
2564
2565                 pn533_pasori_fw_reset(dev);
2566
2567                 break;
2568         }
2569
2570         return 0;
2571 }
2572
2573 int pn533_finalize_setup(struct pn533 *dev)
2574 {
2575
2576         struct pn533_fw_version fw_ver;
2577         int rc;
2578
2579         memset(&fw_ver, 0, sizeof(fw_ver));
2580
2581         rc = pn533_get_firmware_version(dev, &fw_ver);
2582         if (rc) {
2583                 nfc_err(dev->dev, "Unable to get FW version\n");
2584                 return rc;
2585         }
2586
2587         nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2588                 fw_ver.ic, fw_ver.ver, fw_ver.rev);
2589
2590         rc = pn533_setup(dev);
2591         if (rc)
2592                 return rc;
2593
2594         return 0;
2595 }
2596 EXPORT_SYMBOL_GPL(pn533_finalize_setup);
2597
2598 struct pn533 *pn533_register_device(u32 device_type,
2599                                 u32 protocols,
2600                                 enum pn533_protocol_type protocol_type,
2601                                 void *phy,
2602                                 struct pn533_phy_ops *phy_ops,
2603                                 struct pn533_frame_ops *fops,
2604                                 struct device *dev,
2605                                 struct device *parent)
2606 {
2607         struct pn533 *priv;
2608         int rc = -ENOMEM;
2609
2610         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2611         if (!priv)
2612                 return ERR_PTR(-ENOMEM);
2613
2614         priv->phy = phy;
2615         priv->phy_ops = phy_ops;
2616         priv->dev = dev;
2617         if (fops != NULL)
2618                 priv->ops = fops;
2619         else
2620                 priv->ops = &pn533_std_frame_ops;
2621
2622         priv->protocol_type = protocol_type;
2623         priv->device_type = device_type;
2624
2625         mutex_init(&priv->cmd_lock);
2626
2627         INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2628         INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2629         INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2630         INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2631         INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2632         INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2633         INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2634         INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2635         INIT_WORK(&priv->rf_work, pn533_wq_rf);
2636         priv->wq = alloc_ordered_workqueue("pn533", 0);
2637         if (priv->wq == NULL)
2638                 goto error;
2639
2640         init_timer(&priv->listen_timer);
2641         priv->listen_timer.data = (unsigned long) priv;
2642         priv->listen_timer.function = pn533_listen_mode_timer;
2643
2644         skb_queue_head_init(&priv->resp_q);
2645         skb_queue_head_init(&priv->fragment_skb);
2646
2647         INIT_LIST_HEAD(&priv->cmd_queue);
2648
2649         priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2650                                            priv->ops->tx_header_len +
2651                                            PN533_CMD_DATAEXCH_HEAD_LEN,
2652                                            priv->ops->tx_tail_len);
2653         if (!priv->nfc_dev) {
2654                 rc = -ENOMEM;
2655                 goto destroy_wq;
2656         }
2657
2658         nfc_set_parent_dev(priv->nfc_dev, parent);
2659         nfc_set_drvdata(priv->nfc_dev, priv);
2660
2661         rc = nfc_register_device(priv->nfc_dev);
2662         if (rc)
2663                 goto free_nfc_dev;
2664
2665         return priv;
2666
2667 free_nfc_dev:
2668         nfc_free_device(priv->nfc_dev);
2669
2670 destroy_wq:
2671         destroy_workqueue(priv->wq);
2672 error:
2673         kfree(priv);
2674         return ERR_PTR(rc);
2675 }
2676 EXPORT_SYMBOL_GPL(pn533_register_device);
2677
2678 void pn533_unregister_device(struct pn533 *priv)
2679 {
2680         struct pn533_cmd *cmd, *n;
2681
2682         nfc_unregister_device(priv->nfc_dev);
2683         nfc_free_device(priv->nfc_dev);
2684
2685         flush_delayed_work(&priv->poll_work);
2686         destroy_workqueue(priv->wq);
2687
2688         skb_queue_purge(&priv->resp_q);
2689
2690         del_timer(&priv->listen_timer);
2691
2692         list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2693                 list_del(&cmd->queue);
2694                 kfree(cmd);
2695         }
2696
2697         kfree(priv);
2698 }
2699 EXPORT_SYMBOL_GPL(pn533_unregister_device);
2700
2701
2702 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
2703 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2704 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
2705 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2706 MODULE_VERSION(VERSION);
2707 MODULE_LICENSE("GPL");