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         if (type_a->nfcid_len > NFC_NFCID1_MAXSIZE)
 696                 return false;
 697
 698         return true;
 699 }
 700
 701 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
 702                                                         int tgt_data_len)
 703 {
 704         struct pn533_target_type_a *tgt_type_a;
 705
 706         tgt_type_a = (struct pn533_target_type_a *)tgt_data;
 707
 708         if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
 709                 return -EPROTO;
 710
 711         switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
 712         case PN533_TYPE_A_SEL_PROT_MIFARE:
 713                 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
 714                 break;
 715         case PN533_TYPE_A_SEL_PROT_ISO14443:
 716                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
 717                 break;
 718         case PN533_TYPE_A_SEL_PROT_DEP:
 719                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 720                 break;
 721         case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
 722                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
 723                                                         NFC_PROTO_NFC_DEP_MASK;
 724                 break;
 725         }
 726
 727         nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
 728         nfc_tgt->sel_res = tgt_type_a->sel_res;
 729         nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
 730         memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
 731
 732         return 0;
 733 }
 734
 735 struct pn533_target_felica {
 736         u8 pol_res;
 737         u8 opcode;
 738         u8 nfcid2[NFC_NFCID2_MAXSIZE];
 739         u8 pad[8];
 740         /* optional */
 741         u8 syst_code[];
 742 } __packed;
 743
 744 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
 745 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
 746
 747 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
 748                                                         int target_data_len)
 749 {
 750         if (target_data_len < sizeof(struct pn533_target_felica))
 751                 return false;
 752
 753         if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
 754                 return false;
 755
 756         return true;
 757 }
 758
 759 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
 760                                                         int tgt_data_len)
 761 {
 762         struct pn533_target_felica *tgt_felica;
 763
 764         tgt_felica = (struct pn533_target_felica *)tgt_data;
 765
 766         if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
 767                 return -EPROTO;
 768
 769         if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
 770             (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
 771                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 772         else
 773                 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
 774
 775         memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
 776         nfc_tgt->sensf_res_len = 9;
 777
 778         memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
 779         nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
 780
 781         return 0;
 782 }
 783
 784 struct pn533_target_jewel {
 785         __be16 sens_res;
 786         u8 jewelid[4];
 787 } __packed;
 788
 789 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
 790                                                         int target_data_len)
 791 {
 792         u8 ssd;
 793         u8 platconf;
 794
 795         if (target_data_len < sizeof(struct pn533_target_jewel))
 796                 return false;
 797
 798         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
 799         ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
 800         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
 801
 802         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 803              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
 804             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 805              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
 806                 return false;
 807
 808         return true;
 809 }
 810
 811 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
 812                                                         int tgt_data_len)
 813 {
 814         struct pn533_target_jewel *tgt_jewel;
 815
 816         tgt_jewel = (struct pn533_target_jewel *)tgt_data;
 817
 818         if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
 819                 return -EPROTO;
 820
 821         nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
 822         nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
 823         nfc_tgt->nfcid1_len = 4;
 824         memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
 825
 826         return 0;
 827 }
 828
 829 struct pn533_type_b_prot_info {
 830         u8 bitrate;
 831         u8 fsci_type;
 832         u8 fwi_adc_fo;
 833 } __packed;
 834
 835 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
 836 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
 837 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
 838
 839 struct pn533_type_b_sens_res {
 840         u8 opcode;
 841         u8 nfcid[4];
 842         u8 appdata[4];
 843         struct pn533_type_b_prot_info prot_info;
 844 } __packed;
 845
 846 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
 847
 848 struct pn533_target_type_b {
 849         struct pn533_type_b_sens_res sensb_res;
 850         u8 attrib_res_len;
 851         u8 attrib_res[];
 852 } __packed;
 853
 854 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
 855                                                         int target_data_len)
 856 {
 857         if (target_data_len < sizeof(struct pn533_target_type_b))
 858                 return false;
 859
 860         if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
 861                 return false;
 862
 863         if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
 864                                                 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
 865                 return false;
 866
 867         return true;
 868 }
 869
 870 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
 871                                                         int tgt_data_len)
 872 {
 873         struct pn533_target_type_b *tgt_type_b;
 874
 875         tgt_type_b = (struct pn533_target_type_b *)tgt_data;
 876
 877         if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
 878                 return -EPROTO;
 879
 880         nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
 881
 882         return 0;
 883 }
 884
 885 static void pn533_poll_reset_mod_list(struct pn533 *dev);
 886 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
 887                               int tgdata_len)
 888 {
 889         struct nfc_target nfc_tgt;
 890         int rc;
 891
 892         dev_dbg(dev->dev, "%s: modulation=%d\n",
 893                 __func__, dev->poll_mod_curr);
 894
 895         if (tg != 1)
 896                 return -EPROTO;
 897
 898         memset(&nfc_tgt, 0, sizeof(struct nfc_target));
 899
 900         switch (dev->poll_mod_curr) {
 901         case PN533_POLL_MOD_106KBPS_A:
 902                 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
 903                 break;
 904         case PN533_POLL_MOD_212KBPS_FELICA:
 905         case PN533_POLL_MOD_424KBPS_FELICA:
 906                 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
 907                 break;
 908         case PN533_POLL_MOD_106KBPS_JEWEL:
 909                 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
 910                 break;
 911         case PN533_POLL_MOD_847KBPS_B:
 912                 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
 913                 break;
 914         default:
 915                 nfc_err(dev->dev,
 916                         "Unknown current poll modulation\n");
 917                 return -EPROTO;
 918         }
 919
 920         if (rc)
 921                 return rc;
 922
 923         if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
 924                 dev_dbg(dev->dev,
 925                         "The Tg found doesn't have the desired protocol\n");
 926                 return -EAGAIN;
 927         }
 928
 929         dev_dbg(dev->dev,
 930                 "Target found - supported protocols: 0x%x\n",
 931                 nfc_tgt.supported_protocols);
 932
 933         dev->tgt_available_prots = nfc_tgt.supported_protocols;
 934
 935         pn533_poll_reset_mod_list(dev);
 936         nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
 937
 938         return 0;
 939 }
 940
 941 static inline void pn533_poll_next_mod(struct pn533 *dev)
 942 {
 943         dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
 944 }
 945
 946 static void pn533_poll_reset_mod_list(struct pn533 *dev)
 947 {
 948         dev->poll_mod_count = 0;
 949 }
 950
 951 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
 952 {
 953         dev->poll_mod_active[dev->poll_mod_count] =
 954                 (struct pn533_poll_modulations *)&poll_mod[mod_index];
 955         dev->poll_mod_count++;
 956 }
 957
 958 static void pn533_poll_create_mod_list(struct pn533 *dev,
 959                                        u32 im_protocols, u32 tm_protocols)
 960 {
 961         pn533_poll_reset_mod_list(dev);
 962
 963         if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
 964             (im_protocols & NFC_PROTO_ISO14443_MASK) ||
 965             (im_protocols & NFC_PROTO_NFC_DEP_MASK))
 966                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
 967
 968         if (im_protocols & NFC_PROTO_FELICA_MASK ||
 969             im_protocols & NFC_PROTO_NFC_DEP_MASK) {
 970                 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
 971                 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
 972         }
 973
 974         if (im_protocols & NFC_PROTO_JEWEL_MASK)
 975                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
 976
 977         if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
 978                 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
 979
 980         if (tm_protocols)
 981                 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
 982 }
 983
 984 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
 985 {
 986         u8 nbtg, tg, *tgdata;
 987         int rc, tgdata_len;
 988
 989         /* Toggle the DEP polling */
 990         if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK)
 991                 dev->poll_dep = 1;
 992
 993         nbtg = resp->data[0];
 994         tg = resp->data[1];
 995         tgdata = &resp->data[2];
 996         tgdata_len = resp->len - 2;  /* nbtg + tg */
 997
 998         if (nbtg) {
 999                 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1000
1001                 /* We must stop the poll after a valid target found */
1002                 if (rc == 0)
1003                         return 0;
1004         }
1005
1006         return -EAGAIN;
1007 }
1008
1009 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1010 {
1011         struct sk_buff *skb;
1012         u8 *felica, *nfcid3;
1013
1014         u8 *gbytes = dev->gb;
1015         size_t gbytes_len = dev->gb_len;
1016
1017         u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1018                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1019                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1020                                 0xff, 0xff}; /* System code */
1021
1022         u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1023                                0x0, 0x0, 0x0,
1024                                0x40}; /* SEL_RES for DEP */
1025
1026         unsigned int skb_len = 36 + /*
1027                                      * mode (1), mifare (6),
1028                                      * felica (18), nfcid3 (10), gb_len (1)
1029                                      */
1030                                gbytes_len +
1031                                1;  /* len Tk*/
1032
1033         skb = pn533_alloc_skb(dev, skb_len);
1034         if (!skb)
1035                 return NULL;
1036
1037         /* DEP support only */
1038         skb_put_u8(skb, PN533_INIT_TARGET_DEP);
1039
1040         /* MIFARE params */
1041         skb_put_data(skb, mifare_params, 6);
1042
1043         /* Felica params */
1044         felica = skb_put_data(skb, felica_params, 18);
1045         get_random_bytes(felica + 2, 6);
1046
1047         /* NFCID3 */
1048         nfcid3 = skb_put_zero(skb, 10);
1049         memcpy(nfcid3, felica, 8);
1050
1051         /* General bytes */
1052         skb_put_u8(skb, gbytes_len);
1053
1054         skb_put_data(skb, gbytes, gbytes_len);
1055
1056         /* Len Tk */
1057         skb_put_u8(skb, 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(struct timer_list *t)
1239 {
1240         struct pn533 *dev = from_timer(dev, t, listen_timer);
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_u8(skb, PN533_CFGITEM_RF_FIELD);
1287         skb_put_u8(skb, 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_u8(skb, 0x01);  /* Active */
1382         skb_put_u8(skb, 0x02);  /* 424 kbps */
1383
1384         next = skb_put(skb, 1);  /* Next */
1385         *next = 0;
1386
1387         /* Copy passive data */
1388         skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
1389         *next |= 1;
1390
1391         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1392         skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
1393         *next |= 2;
1394
1395         skb_put_data(skb, dev->gb, dev->gb_len);
1396         *next |= 4; /* We have some Gi */
1397
1398         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1399                                   pn533_poll_dep_complete, NULL);
1400
1401         if (rc < 0)
1402                 dev_kfree_skb(skb);
1403
1404         return rc;
1405 }
1406
1407 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1408                                struct sk_buff *resp)
1409 {
1410         struct pn533_poll_modulations *cur_mod;
1411         int rc;
1412
1413         dev_dbg(dev->dev, "%s\n", __func__);
1414
1415         if (IS_ERR(resp)) {
1416                 rc = PTR_ERR(resp);
1417
1418                 nfc_err(dev->dev, "%s  Poll complete error %d\n",
1419                         __func__, rc);
1420
1421                 if (rc == -ENOENT) {
1422                         if (dev->poll_mod_count != 0)
1423                                 return rc;
1424                         goto stop_poll;
1425                 } else if (rc < 0) {
1426                         nfc_err(dev->dev,
1427                                 "Error %d when running poll\n", rc);
1428                         goto stop_poll;
1429                 }
1430         }
1431
1432         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1433
1434         if (cur_mod->len == 0) { /* Target mode */
1435                 del_timer(&dev->listen_timer);
1436                 rc = pn533_init_target_complete(dev, resp);
1437                 goto done;
1438         }
1439
1440         /* Initiator mode */
1441         rc = pn533_start_poll_complete(dev, resp);
1442         if (!rc)
1443                 goto done;
1444
1445         if (!dev->poll_mod_count) {
1446                 dev_dbg(dev->dev, "Polling has been stopped\n");
1447                 goto done;
1448         }
1449
1450         pn533_poll_next_mod(dev);
1451         /* Not target found, turn radio off */
1452         queue_work(dev->wq, &dev->rf_work);
1453
1454 done:
1455         dev_kfree_skb(resp);
1456         return rc;
1457
1458 stop_poll:
1459         nfc_err(dev->dev, "Polling operation has been stopped\n");
1460
1461         pn533_poll_reset_mod_list(dev);
1462         dev->poll_protocols = 0;
1463         return rc;
1464 }
1465
1466 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1467                                         struct pn533_poll_modulations *mod)
1468 {
1469         struct sk_buff *skb;
1470
1471         skb = pn533_alloc_skb(dev, mod->len);
1472         if (!skb)
1473                 return NULL;
1474
1475         skb_put_data(skb, &mod->data, mod->len);
1476
1477         return skb;
1478 }
1479
1480 static int pn533_send_poll_frame(struct pn533 *dev)
1481 {
1482         struct pn533_poll_modulations *mod;
1483         struct sk_buff *skb;
1484         int rc;
1485         u8 cmd_code;
1486
1487         mod = dev->poll_mod_active[dev->poll_mod_curr];
1488
1489         dev_dbg(dev->dev, "%s mod len %d\n",
1490                 __func__, mod->len);
1491
1492         if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep)  {
1493                 dev->poll_dep = 0;
1494                 return pn533_poll_dep(dev->nfc_dev);
1495         }
1496
1497         if (mod->len == 0) {  /* Listen mode */
1498                 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1499                 skb = pn533_alloc_poll_tg_frame(dev);
1500         } else {  /* Polling mode */
1501                 cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
1502                 skb = pn533_alloc_poll_in_frame(dev, mod);
1503         }
1504
1505         if (!skb) {
1506                 nfc_err(dev->dev, "Failed to allocate skb\n");
1507                 return -ENOMEM;
1508         }
1509
1510         rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1511                                   NULL);
1512         if (rc < 0) {
1513                 dev_kfree_skb(skb);
1514                 nfc_err(dev->dev, "Polling loop error %d\n", rc);
1515         }
1516
1517         return rc;
1518 }
1519
1520 static void pn533_wq_poll(struct work_struct *work)
1521 {
1522         struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1523         struct pn533_poll_modulations *cur_mod;
1524         int rc;
1525
1526         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1527
1528         dev_dbg(dev->dev,
1529                 "%s cancel_listen %d modulation len %d\n",
1530                 __func__, dev->cancel_listen, cur_mod->len);
1531
1532         if (dev->cancel_listen == 1) {
1533                 dev->cancel_listen = 0;
1534                 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC);
1535         }
1536
1537         rc = pn533_send_poll_frame(dev);
1538         if (rc)
1539                 return;
1540
1541         if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1542                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1543 }
1544
1545 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1546                             u32 im_protocols, u32 tm_protocols)
1547 {
1548         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1549         struct pn533_poll_modulations *cur_mod;
1550         u8 rand_mod;
1551         int rc;
1552
1553         dev_dbg(dev->dev,
1554                 "%s: im protocols 0x%x tm protocols 0x%x\n",
1555                 __func__, im_protocols, tm_protocols);
1556
1557         if (dev->tgt_active_prot) {
1558                 nfc_err(dev->dev,
1559                         "Cannot poll with a target already activated\n");
1560                 return -EBUSY;
1561         }
1562
1563         if (dev->tgt_mode) {
1564                 nfc_err(dev->dev,
1565                         "Cannot poll while already being activated\n");
1566                 return -EBUSY;
1567         }
1568
1569         if (tm_protocols) {
1570                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1571                 if (dev->gb == NULL)
1572                         tm_protocols = 0;
1573         }
1574
1575         pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1576         dev->poll_protocols = im_protocols;
1577         dev->listen_protocols = tm_protocols;
1578
1579         /* Do not always start polling from the same modulation */
1580         get_random_bytes(&rand_mod, sizeof(rand_mod));
1581         rand_mod %= dev->poll_mod_count;
1582         dev->poll_mod_curr = rand_mod;
1583
1584         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1585
1586         rc = pn533_send_poll_frame(dev);
1587
1588         /* Start listen timer */
1589         if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
1590                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1591
1592         return rc;
1593 }
1594
1595 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1596 {
1597         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1598
1599         del_timer(&dev->listen_timer);
1600
1601         if (!dev->poll_mod_count) {
1602                 dev_dbg(dev->dev,
1603                         "Polling operation was not running\n");
1604                 return;
1605         }
1606
1607         dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1608         flush_delayed_work(&dev->poll_work);
1609         pn533_poll_reset_mod_list(dev);
1610 }
1611
1612 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1613 {
1614         struct pn533_cmd_activate_response *rsp;
1615         u16 gt_len;
1616         int rc;
1617         struct sk_buff *skb;
1618         struct sk_buff *resp;
1619
1620         dev_dbg(dev->dev, "%s\n", __func__);
1621
1622         skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1623         if (!skb)
1624                 return -ENOMEM;
1625
1626         skb_put_u8(skb, 1); /* TG */
1627         skb_put_u8(skb, 0); /* Next */
1628
1629         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1630         if (IS_ERR(resp))
1631                 return PTR_ERR(resp);
1632
1633         rsp = (struct pn533_cmd_activate_response *)resp->data;
1634         rc = rsp->status & PN533_CMD_RET_MASK;
1635         if (rc != PN533_CMD_RET_SUCCESS) {
1636                 nfc_err(dev->dev,
1637                         "Target activation failed (error 0x%x)\n", rc);
1638                 dev_kfree_skb(resp);
1639                 return -EIO;
1640         }
1641
1642         /* ATR_RES general bytes are located at offset 16 */
1643         gt_len = resp->len - 16;
1644         rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1645
1646         dev_kfree_skb(resp);
1647         return rc;
1648 }
1649
1650 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1651                                  struct nfc_target *target, u32 protocol)
1652 {
1653         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1654         int rc;
1655
1656         dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol);
1657
1658         if (dev->poll_mod_count) {
1659                 nfc_err(dev->dev,
1660                         "Cannot activate while polling\n");
1661                 return -EBUSY;
1662         }
1663
1664         if (dev->tgt_active_prot) {
1665                 nfc_err(dev->dev,
1666                         "There is already an active target\n");
1667                 return -EBUSY;
1668         }
1669
1670         if (!dev->tgt_available_prots) {
1671                 nfc_err(dev->dev,
1672                         "There is no available target to activate\n");
1673                 return -EINVAL;
1674         }
1675
1676         if (!(dev->tgt_available_prots & (1 << protocol))) {
1677                 nfc_err(dev->dev,
1678                         "Target doesn't support requested proto %u\n",
1679                         protocol);
1680                 return -EINVAL;
1681         }
1682
1683         if (protocol == NFC_PROTO_NFC_DEP) {
1684                 rc = pn533_activate_target_nfcdep(dev);
1685                 if (rc) {
1686                         nfc_err(dev->dev,
1687                                 "Activating target with DEP failed %d\n", rc);
1688                         return rc;
1689                 }
1690         }
1691
1692         dev->tgt_active_prot = protocol;
1693         dev->tgt_available_prots = 0;
1694
1695         return 0;
1696 }
1697
1698 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg,
1699                              struct sk_buff *resp)
1700 {
1701         int rc = 0;
1702
1703         dev_dbg(dev->dev, "%s\n", __func__);
1704
1705         if (IS_ERR(resp)) {
1706                 rc = PTR_ERR(resp);
1707
1708                 nfc_err(dev->dev, "Target release error %d\n", rc);
1709
1710                 return rc;
1711         }
1712
1713         rc = resp->data[0] & PN533_CMD_RET_MASK;
1714         if (rc != PN533_CMD_RET_SUCCESS)
1715                 nfc_err(dev->dev,
1716                         "Error 0x%x when releasing the target\n", rc);
1717
1718         dev_kfree_skb(resp);
1719         return rc;
1720 }
1721
1722 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1723                                     struct nfc_target *target, u8 mode)
1724 {
1725         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1726         struct sk_buff *skb;
1727         int rc;
1728
1729         dev_dbg(dev->dev, "%s\n", __func__);
1730
1731         if (!dev->tgt_active_prot) {
1732                 nfc_err(dev->dev, "There is no active target\n");
1733                 return;
1734         }
1735
1736         dev->tgt_active_prot = 0;
1737         skb_queue_purge(&dev->resp_q);
1738
1739         skb = pn533_alloc_skb(dev, sizeof(u8));
1740         if (!skb)
1741                 return;
1742
1743         skb_put_u8(skb, 1); /* TG*/
1744
1745         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb,
1746                                   pn533_deactivate_target_complete, NULL);
1747         if (rc < 0) {
1748                 dev_kfree_skb(skb);
1749                 nfc_err(dev->dev, "Target release error %d\n", rc);
1750         }
1751 }
1752
1753
1754 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1755                                          struct sk_buff *resp)
1756 {
1757         struct pn533_cmd_jump_dep_response *rsp;
1758         u8 target_gt_len;
1759         int rc;
1760         u8 active = *(u8 *)arg;
1761
1762         kfree(arg);
1763
1764         if (IS_ERR(resp))
1765                 return PTR_ERR(resp);
1766
1767         if (dev->tgt_available_prots &&
1768             !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1769                 nfc_err(dev->dev,
1770                         "The target does not support DEP\n");
1771                 rc =  -EINVAL;
1772                 goto error;
1773         }
1774
1775         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1776
1777         rc = rsp->status & PN533_CMD_RET_MASK;
1778         if (rc != PN533_CMD_RET_SUCCESS) {
1779                 nfc_err(dev->dev,
1780                         "Bringing DEP link up failed (error 0x%x)\n", rc);
1781                 goto error;
1782         }
1783
1784         if (!dev->tgt_available_prots) {
1785                 struct nfc_target nfc_target;
1786
1787                 dev_dbg(dev->dev, "Creating new target\n");
1788
1789                 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1790                 nfc_target.nfcid1_len = 10;
1791                 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1792                 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1793                 if (rc)
1794                         goto error;
1795
1796                 dev->tgt_available_prots = 0;
1797         }
1798
1799         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1800
1801         /* ATR_RES general bytes are located at offset 17 */
1802         target_gt_len = resp->len - 17;
1803         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1804                                           rsp->gt, target_gt_len);
1805         if (rc == 0)
1806                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1807                                         dev->nfc_dev->targets[0].idx,
1808                                         !active, NFC_RF_INITIATOR);
1809
1810 error:
1811         dev_kfree_skb(resp);
1812         return rc;
1813 }
1814
1815 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
1816 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1817                              u8 comm_mode, u8 *gb, size_t gb_len)
1818 {
1819         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1820         struct sk_buff *skb;
1821         int rc, skb_len;
1822         u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
1823         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1824
1825         dev_dbg(dev->dev, "%s\n", __func__);
1826
1827         if (dev->poll_mod_count) {
1828                 nfc_err(dev->dev,
1829                         "Cannot bring the DEP link up while polling\n");
1830                 return -EBUSY;
1831         }
1832
1833         if (dev->tgt_active_prot) {
1834                 nfc_err(dev->dev,
1835                         "There is already an active target\n");
1836                 return -EBUSY;
1837         }
1838
1839         skb_len = 3 + gb_len; /* ActPass + BR + Next */
1840         skb_len += PASSIVE_DATA_LEN;
1841
1842         /* NFCID3 */
1843         skb_len += NFC_NFCID3_MAXSIZE;
1844         if (target && !target->nfcid2_len) {
1845                 nfcid3[0] = 0x1;
1846                 nfcid3[1] = 0xfe;
1847                 get_random_bytes(nfcid3 + 2, 6);
1848         }
1849
1850         skb = pn533_alloc_skb(dev, skb_len);
1851         if (!skb)
1852                 return -ENOMEM;
1853
1854         skb_put_u8(skb, !comm_mode);  /* ActPass */
1855         skb_put_u8(skb, 0x02);  /* 424 kbps */
1856
1857         next = skb_put(skb, 1);  /* Next */
1858         *next = 0;
1859
1860         /* Copy passive data */
1861         skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
1862         *next |= 1;
1863
1864         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1865         if (target && target->nfcid2_len)
1866                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
1867                        target->nfcid2_len);
1868         else
1869                 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
1870         *next |= 2;
1871
1872         if (gb != NULL && gb_len > 0) {
1873                 skb_put_data(skb, gb, gb_len);
1874                 *next |= 4; /* We have some Gi */
1875         } else {
1876                 *next = 0;
1877         }
1878
1879         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
1880         if (!arg) {
1881                 dev_kfree_skb(skb);
1882                 return -ENOMEM;
1883         }
1884
1885         *arg = !comm_mode;
1886
1887         pn533_rf_field(dev->nfc_dev, 0);
1888
1889         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1890                                   pn533_in_dep_link_up_complete, arg);
1891
1892         if (rc < 0) {
1893                 dev_kfree_skb(skb);
1894                 kfree(arg);
1895         }
1896
1897         return rc;
1898 }
1899
1900 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
1901 {
1902         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1903
1904         dev_dbg(dev->dev, "%s\n", __func__);
1905
1906         pn533_poll_reset_mod_list(dev);
1907
1908         if (dev->tgt_mode || dev->tgt_active_prot)
1909                 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1910
1911         dev->tgt_active_prot = 0;
1912         dev->tgt_mode = 0;
1913
1914         skb_queue_purge(&dev->resp_q);
1915
1916         return 0;
1917 }
1918
1919 struct pn533_data_exchange_arg {
1920         data_exchange_cb_t cb;
1921         void *cb_context;
1922 };
1923
1924 static struct sk_buff *pn533_build_response(struct pn533 *dev)
1925 {
1926         struct sk_buff *skb, *tmp, *t;
1927         unsigned int skb_len = 0, tmp_len = 0;
1928
1929         dev_dbg(dev->dev, "%s\n", __func__);
1930
1931         if (skb_queue_empty(&dev->resp_q))
1932                 return NULL;
1933
1934         if (skb_queue_len(&dev->resp_q) == 1) {
1935                 skb = skb_dequeue(&dev->resp_q);
1936                 goto out;
1937         }
1938
1939         skb_queue_walk_safe(&dev->resp_q, tmp, t)
1940                 skb_len += tmp->len;
1941
1942         dev_dbg(dev->dev, "%s total length %d\n",
1943                 __func__, skb_len);
1944
1945         skb = alloc_skb(skb_len, GFP_KERNEL);
1946         if (skb == NULL)
1947                 goto out;
1948
1949         skb_put(skb, skb_len);
1950
1951         skb_queue_walk_safe(&dev->resp_q, tmp, t) {
1952                 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
1953                 tmp_len += tmp->len;
1954         }
1955
1956 out:
1957         skb_queue_purge(&dev->resp_q);
1958
1959         return skb;
1960 }
1961
1962 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
1963                                         struct sk_buff *resp)
1964 {
1965         struct pn533_data_exchange_arg *arg = _arg;
1966         struct sk_buff *skb;
1967         int rc = 0;
1968         u8 status, ret, mi;
1969
1970         dev_dbg(dev->dev, "%s\n", __func__);
1971
1972         if (IS_ERR(resp)) {
1973                 rc = PTR_ERR(resp);
1974                 goto _error;
1975         }
1976
1977         status = resp->data[0];
1978         ret = status & PN533_CMD_RET_MASK;
1979         mi = status & PN533_CMD_MI_MASK;
1980
1981         skb_pull(resp, sizeof(status));
1982
1983         if (ret != PN533_CMD_RET_SUCCESS) {
1984                 nfc_err(dev->dev,
1985                         "Exchanging data failed (error 0x%x)\n", ret);
1986                 rc = -EIO;
1987                 goto error;
1988         }
1989
1990         skb_queue_tail(&dev->resp_q, resp);
1991
1992         if (mi) {
1993                 dev->cmd_complete_mi_arg = arg;
1994                 queue_work(dev->wq, &dev->mi_rx_work);
1995                 return -EINPROGRESS;
1996         }
1997
1998         /* Prepare for the next round */
1999         if (skb_queue_len(&dev->fragment_skb) > 0) {
2000                 dev->cmd_complete_dep_arg = arg;
2001                 queue_work(dev->wq, &dev->mi_tx_work);
2002
2003                 return -EINPROGRESS;
2004         }
2005
2006         skb = pn533_build_response(dev);
2007         if (!skb) {
2008                 rc = -ENOMEM;
2009                 goto error;
2010         }
2011
2012         arg->cb(arg->cb_context, skb, 0);
2013         kfree(arg);
2014         return 0;
2015
2016 error:
2017         dev_kfree_skb(resp);
2018 _error:
2019         skb_queue_purge(&dev->resp_q);
2020         arg->cb(arg->cb_context, NULL, rc);
2021         kfree(arg);
2022         return rc;
2023 }
2024
2025 /*
2026  * Receive an incoming pn533 frame. skb contains only header and payload.
2027  * If skb == NULL, it is a notification that the link below is dead.
2028  */
2029 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2030 {
2031         if (!dev->cmd)
2032                 goto sched_wq;
2033
2034         dev->cmd->status = status;
2035
2036         if (status != 0) {
2037                 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2038                 goto sched_wq;
2039         }
2040
2041         if (skb == NULL) {
2042                 pr_err("NULL Frame -> link is dead\n");
2043                 goto sched_wq;
2044         }
2045
2046         if (pn533_rx_frame_is_ack(skb->data)) {
2047                 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2048                 dev_kfree_skb(skb);
2049                 return;
2050         }
2051
2052         print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2053                              dev->ops->rx_frame_size(skb->data), false);
2054
2055         if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2056                 nfc_err(dev->dev, "Received an invalid frame\n");
2057                 dev->cmd->status = -EIO;
2058         } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2059                 nfc_err(dev->dev, "It it not the response to the last command\n");
2060                 dev->cmd->status = -EIO;
2061         }
2062
2063         dev->cmd->resp = skb;
2064
2065 sched_wq:
2066         queue_work(dev->wq, &dev->cmd_complete_work);
2067 }
2068 EXPORT_SYMBOL(pn533_recv_frame);
2069
2070 /* Split the Tx skb into small chunks */
2071 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2072 {
2073         struct sk_buff *frag;
2074         int  frag_size;
2075
2076         do {
2077                 /* Remaining size */
2078                 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2079                         frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2080                 else
2081                         frag_size = skb->len;
2082
2083                 /* Allocate and reserve */
2084                 frag = pn533_alloc_skb(dev, frag_size);
2085                 if (!frag) {
2086                         skb_queue_purge(&dev->fragment_skb);
2087                         return -ENOMEM;
2088                 }
2089
2090                 if (!dev->tgt_mode) {
2091                         /* Reserve the TG/MI byte */
2092                         skb_reserve(frag, 1);
2093
2094                         /* MI + TG */
2095                         if (frag_size  == PN533_CMD_DATAFRAME_MAXLEN)
2096                                 *(u8 *)skb_push(frag, sizeof(u8)) =
2097                                                 (PN533_CMD_MI_MASK | 1);
2098                         else
2099                                 *(u8 *)skb_push(frag, sizeof(u8)) =  1; /* TG */
2100                 }
2101
2102                 skb_put_data(frag, skb->data, frag_size);
2103
2104                 /* Reduce the size of incoming buffer */
2105                 skb_pull(skb, frag_size);
2106
2107                 /* Add this to skb_queue */
2108                 skb_queue_tail(&dev->fragment_skb, frag);
2109
2110         } while (skb->len > 0);
2111
2112         dev_kfree_skb(skb);
2113
2114         return skb_queue_len(&dev->fragment_skb);
2115 }
2116
2117 static int pn533_transceive(struct nfc_dev *nfc_dev,
2118                             struct nfc_target *target, struct sk_buff *skb,
2119                             data_exchange_cb_t cb, void *cb_context)
2120 {
2121         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2122         struct pn533_data_exchange_arg *arg = NULL;
2123         int rc;
2124
2125         dev_dbg(dev->dev, "%s\n", __func__);
2126
2127         if (!dev->tgt_active_prot) {
2128                 nfc_err(dev->dev,
2129                         "Can't exchange data if there is no active target\n");
2130                 rc = -EINVAL;
2131                 goto error;
2132         }
2133
2134         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2135         if (!arg) {
2136                 rc = -ENOMEM;
2137                 goto error;
2138         }
2139
2140         arg->cb = cb;
2141         arg->cb_context = cb_context;
2142
2143         switch (dev->device_type) {
2144         case PN533_DEVICE_PASORI:
2145                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2146                         rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2147                                                    skb,
2148                                                    pn533_data_exchange_complete,
2149                                                    arg);
2150
2151                         break;
2152                 }
2153         default:
2154                 /* jumbo frame ? */
2155                 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2156                         rc = pn533_fill_fragment_skbs(dev, skb);
2157                         if (rc < 0)
2158                                 goto error;
2159
2160                         skb = skb_dequeue(&dev->fragment_skb);
2161                         if (!skb) {
2162                                 rc = -EIO;
2163                                 goto error;
2164                         }
2165                 } else {
2166                         *(u8 *)skb_push(skb, sizeof(u8)) =  1; /* TG */
2167                 }
2168
2169                 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2170                                            skb, pn533_data_exchange_complete,
2171                                            arg);
2172
2173                 break;
2174         }
2175
2176         if (rc < 0) /* rc from send_async */
2177                 goto error;
2178
2179         return 0;
2180
2181 error:
2182         kfree(arg);
2183         dev_kfree_skb(skb);
2184         return rc;
2185 }
2186
2187 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2188                                   struct sk_buff *resp)
2189 {
2190         u8 status;
2191
2192         dev_dbg(dev->dev, "%s\n", __func__);
2193
2194         if (IS_ERR(resp))
2195                 return PTR_ERR(resp);
2196
2197         status = resp->data[0];
2198
2199         /* Prepare for the next round */
2200         if (skb_queue_len(&dev->fragment_skb) > 0) {
2201                 queue_work(dev->wq, &dev->mi_tm_tx_work);
2202                 return -EINPROGRESS;
2203         }
2204         dev_kfree_skb(resp);
2205
2206         if (status != 0) {
2207                 nfc_tm_deactivated(dev->nfc_dev);
2208
2209                 dev->tgt_mode = 0;
2210
2211                 return 0;
2212         }
2213
2214         queue_work(dev->wq, &dev->tg_work);
2215
2216         return 0;
2217 }
2218
2219 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2220 {
2221         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2222         int rc;
2223
2224         dev_dbg(dev->dev, "%s\n", __func__);
2225
2226         /* let's split in multiple chunks if size's too big */
2227         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2228                 rc = pn533_fill_fragment_skbs(dev, skb);
2229                 if (rc < 0)
2230                         goto error;
2231
2232                 /* get the first skb */
2233                 skb = skb_dequeue(&dev->fragment_skb);
2234                 if (!skb) {
2235                         rc = -EIO;
2236                         goto error;
2237                 }
2238
2239                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2240                                                 pn533_tm_send_complete, NULL);
2241         } else {
2242                 /* Send th skb */
2243                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2244                                                 pn533_tm_send_complete, NULL);
2245         }
2246
2247 error:
2248         if (rc < 0) {
2249                 dev_kfree_skb(skb);
2250                 skb_queue_purge(&dev->fragment_skb);
2251         }
2252
2253         return rc;
2254 }
2255
2256 static void pn533_wq_mi_recv(struct work_struct *work)
2257 {
2258         struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2259         struct sk_buff *skb;
2260         int rc;
2261
2262         dev_dbg(dev->dev, "%s\n", __func__);
2263
2264         skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2265         if (!skb)
2266                 goto error;
2267
2268         switch (dev->device_type) {
2269         case PN533_DEVICE_PASORI:
2270                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2271                         rc = pn533_send_cmd_direct_async(dev,
2272                                                 PN533_CMD_IN_COMM_THRU,
2273                                                 skb,
2274                                                 pn533_data_exchange_complete,
2275                                                  dev->cmd_complete_mi_arg);
2276
2277                         break;
2278                 }
2279         default:
2280                 skb_put_u8(skb, 1); /*TG*/
2281
2282                 rc = pn533_send_cmd_direct_async(dev,
2283                                                  PN533_CMD_IN_DATA_EXCHANGE,
2284                                                  skb,
2285                                                  pn533_data_exchange_complete,
2286                                                  dev->cmd_complete_mi_arg);
2287
2288                 break;
2289         }
2290
2291         if (rc == 0) /* success */
2292                 return;
2293
2294         nfc_err(dev->dev,
2295                 "Error %d when trying to perform data_exchange\n", rc);
2296
2297         dev_kfree_skb(skb);
2298         kfree(dev->cmd_complete_mi_arg);
2299
2300 error:
2301         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2302         queue_work(dev->wq, &dev->cmd_work);
2303 }
2304
2305 static void pn533_wq_mi_send(struct work_struct *work)
2306 {
2307         struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2308         struct sk_buff *skb;
2309         int rc;
2310
2311         dev_dbg(dev->dev, "%s\n", __func__);
2312
2313         /* Grab the first skb in the queue */
2314         skb = skb_dequeue(&dev->fragment_skb);
2315
2316         if (skb == NULL) {      /* No more data */
2317                 /* Reset the queue for future use */
2318                 skb_queue_head_init(&dev->fragment_skb);
2319                 goto error;
2320         }
2321
2322         switch (dev->device_type) {
2323         case PN533_DEVICE_PASORI:
2324                 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2325                         rc = -EIO;
2326                         break;
2327                 }
2328
2329                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2330                                                  skb,
2331                                                  pn533_data_exchange_complete,
2332                                                  dev->cmd_complete_dep_arg);
2333
2334                 break;
2335
2336         default:
2337                 /* Still some fragments? */
2338                 rc = pn533_send_cmd_direct_async(dev,
2339                                                  PN533_CMD_IN_DATA_EXCHANGE,
2340                                                  skb,
2341                                                  pn533_data_exchange_complete,
2342                                                  dev->cmd_complete_dep_arg);
2343
2344                 break;
2345         }
2346
2347         if (rc == 0) /* success */
2348                 return;
2349
2350         nfc_err(dev->dev,
2351                 "Error %d when trying to perform data_exchange\n", rc);
2352
2353         dev_kfree_skb(skb);
2354         kfree(dev->cmd_complete_dep_arg);
2355
2356 error:
2357         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2358         queue_work(dev->wq, &dev->cmd_work);
2359 }
2360
2361 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2362                                                                 u8 cfgdata_len)
2363 {
2364         struct sk_buff *skb;
2365         struct sk_buff *resp;
2366         int skb_len;
2367
2368         dev_dbg(dev->dev, "%s\n", __func__);
2369
2370         skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2371
2372         skb = pn533_alloc_skb(dev, skb_len);
2373         if (!skb)
2374                 return -ENOMEM;
2375
2376         skb_put_u8(skb, cfgitem);
2377         skb_put_data(skb, cfgdata, cfgdata_len);
2378
2379         resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2380         if (IS_ERR(resp))
2381                 return PTR_ERR(resp);
2382
2383         dev_kfree_skb(resp);
2384         return 0;
2385 }
2386
2387 static int pn533_get_firmware_version(struct pn533 *dev,
2388                                       struct pn533_fw_version *fv)
2389 {
2390         struct sk_buff *skb;
2391         struct sk_buff *resp;
2392
2393         skb = pn533_alloc_skb(dev, 0);
2394         if (!skb)
2395                 return -ENOMEM;
2396
2397         resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2398         if (IS_ERR(resp))
2399                 return PTR_ERR(resp);
2400
2401         fv->ic = resp->data[0];
2402         fv->ver = resp->data[1];
2403         fv->rev = resp->data[2];
2404         fv->support = resp->data[3];
2405
2406         dev_kfree_skb(resp);
2407         return 0;
2408 }
2409
2410 static int pn533_pasori_fw_reset(struct pn533 *dev)
2411 {
2412         struct sk_buff *skb;
2413         struct sk_buff *resp;
2414
2415         dev_dbg(dev->dev, "%s\n", __func__);
2416
2417         skb = pn533_alloc_skb(dev, sizeof(u8));
2418         if (!skb)
2419                 return -ENOMEM;
2420
2421         skb_put_u8(skb, 0x1);
2422
2423         resp = pn533_send_cmd_sync(dev, 0x18, skb);
2424         if (IS_ERR(resp))
2425                 return PTR_ERR(resp);
2426
2427         dev_kfree_skb(resp);
2428
2429         return 0;
2430 }
2431
2432 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2433 {
2434         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2435         u8 rf_field = !!rf;
2436         int rc;
2437
2438         rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2439
2440         rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2441                                      (u8 *)&rf_field, 1);
2442         if (rc) {
2443                 nfc_err(dev->dev, "Error on setting RF field\n");
2444                 return rc;
2445         }
2446
2447         return rc;
2448 }
2449
2450 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2451 {
2452         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2453         struct sk_buff *skb;
2454         struct sk_buff *resp;
2455
2456         skb = pn533_alloc_skb(dev, 1);
2457         if (!skb)
2458                 return -ENOMEM;
2459
2460         skb_put_u8(skb, 0x01);
2461
2462         resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2463         if (IS_ERR(resp))
2464                 return PTR_ERR(resp);
2465
2466         dev_kfree_skb(resp);
2467         return 0;
2468 }
2469
2470 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2471 {
2472         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2473
2474         if (dev->device_type == PN533_DEVICE_PN532) {
2475                 int rc = pn532_sam_configuration(nfc_dev);
2476
2477                 if (rc)
2478                         return rc;
2479         }
2480
2481         return pn533_rf_field(nfc_dev, 1);
2482 }
2483
2484 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2485 {
2486         return pn533_rf_field(nfc_dev, 0);
2487 }
2488
2489 static struct nfc_ops pn533_nfc_ops = {
2490         .dev_up = pn533_dev_up,
2491         .dev_down = pn533_dev_down,
2492         .dep_link_up = pn533_dep_link_up,
2493         .dep_link_down = pn533_dep_link_down,
2494         .start_poll = pn533_start_poll,
2495         .stop_poll = pn533_stop_poll,
2496         .activate_target = pn533_activate_target,
2497         .deactivate_target = pn533_deactivate_target,
2498         .im_transceive = pn533_transceive,
2499         .tm_send = pn533_tm_send,
2500 };
2501
2502 static int pn533_setup(struct pn533 *dev)
2503 {
2504         struct pn533_config_max_retries max_retries;
2505         struct pn533_config_timing timing;
2506         u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2507         int rc;
2508
2509         switch (dev->device_type) {
2510         case PN533_DEVICE_STD:
2511         case PN533_DEVICE_PASORI:
2512         case PN533_DEVICE_ACR122U:
2513         case PN533_DEVICE_PN532:
2514                 max_retries.mx_rty_atr = 0x2;
2515                 max_retries.mx_rty_psl = 0x1;
2516                 max_retries.mx_rty_passive_act =
2517                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2518
2519                 timing.rfu = PN533_CONFIG_TIMING_102;
2520                 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2521                 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2522
2523                 break;
2524
2525         default:
2526                 nfc_err(dev->dev, "Unknown device type %d\n",
2527                         dev->device_type);
2528                 return -EINVAL;
2529         }
2530
2531         rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2532                                      (u8 *)&max_retries, sizeof(max_retries));
2533         if (rc) {
2534                 nfc_err(dev->dev,
2535                         "Error on setting MAX_RETRIES config\n");
2536                 return rc;
2537         }
2538
2539
2540         rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2541                                      (u8 *)&timing, sizeof(timing));
2542         if (rc) {
2543                 nfc_err(dev->dev, "Error on setting RF timings\n");
2544                 return rc;
2545         }
2546
2547         switch (dev->device_type) {
2548         case PN533_DEVICE_STD:
2549         case PN533_DEVICE_PN532:
2550                 break;
2551
2552         case PN533_DEVICE_PASORI:
2553                 pn533_pasori_fw_reset(dev);
2554
2555                 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2556                                              pasori_cfg, 3);
2557                 if (rc) {
2558                         nfc_err(dev->dev,
2559                                 "Error while settings PASORI config\n");
2560                         return rc;
2561                 }
2562
2563                 pn533_pasori_fw_reset(dev);
2564
2565                 break;
2566         }
2567
2568         return 0;
2569 }
2570
2571 int pn533_finalize_setup(struct pn533 *dev)
2572 {
2573
2574         struct pn533_fw_version fw_ver;
2575         int rc;
2576
2577         memset(&fw_ver, 0, sizeof(fw_ver));
2578
2579         rc = pn533_get_firmware_version(dev, &fw_ver);
2580         if (rc) {
2581                 nfc_err(dev->dev, "Unable to get FW version\n");
2582                 return rc;
2583         }
2584
2585         nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2586                 fw_ver.ic, fw_ver.ver, fw_ver.rev);
2587
2588         rc = pn533_setup(dev);
2589         if (rc)
2590                 return rc;
2591
2592         return 0;
2593 }
2594 EXPORT_SYMBOL_GPL(pn533_finalize_setup);
2595
2596 struct pn533 *pn533_register_device(u32 device_type,
2597                                 u32 protocols,
2598                                 enum pn533_protocol_type protocol_type,
2599                                 void *phy,
2600                                 struct pn533_phy_ops *phy_ops,
2601                                 struct pn533_frame_ops *fops,
2602                                 struct device *dev,
2603                                 struct device *parent)
2604 {
2605         struct pn533 *priv;
2606         int rc = -ENOMEM;
2607
2608         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2609         if (!priv)
2610                 return ERR_PTR(-ENOMEM);
2611
2612         priv->phy = phy;
2613         priv->phy_ops = phy_ops;
2614         priv->dev = dev;
2615         if (fops != NULL)
2616                 priv->ops = fops;
2617         else
2618                 priv->ops = &pn533_std_frame_ops;
2619
2620         priv->protocol_type = protocol_type;
2621         priv->device_type = device_type;
2622
2623         mutex_init(&priv->cmd_lock);
2624
2625         INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2626         INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2627         INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2628         INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2629         INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2630         INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2631         INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2632         INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2633         INIT_WORK(&priv->rf_work, pn533_wq_rf);
2634         priv->wq = alloc_ordered_workqueue("pn533", 0);
2635         if (priv->wq == NULL)
2636                 goto error;
2637
2638         timer_setup(&priv->listen_timer, pn533_listen_mode_timer, 0);
2639
2640         skb_queue_head_init(&priv->resp_q);
2641         skb_queue_head_init(&priv->fragment_skb);
2642
2643         INIT_LIST_HEAD(&priv->cmd_queue);
2644
2645         priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2646                                            priv->ops->tx_header_len +
2647                                            PN533_CMD_DATAEXCH_HEAD_LEN,
2648                                            priv->ops->tx_tail_len);
2649         if (!priv->nfc_dev) {
2650                 rc = -ENOMEM;
2651                 goto destroy_wq;
2652         }
2653
2654         nfc_set_parent_dev(priv->nfc_dev, parent);
2655         nfc_set_drvdata(priv->nfc_dev, priv);
2656
2657         rc = nfc_register_device(priv->nfc_dev);
2658         if (rc)
2659                 goto free_nfc_dev;
2660
2661         return priv;
2662
2663 free_nfc_dev:
2664         nfc_free_device(priv->nfc_dev);
2665
2666 destroy_wq:
2667         destroy_workqueue(priv->wq);
2668 error:
2669         kfree(priv);
2670         return ERR_PTR(rc);
2671 }
2672 EXPORT_SYMBOL_GPL(pn533_register_device);
2673
2674 void pn533_unregister_device(struct pn533 *priv)
2675 {
2676         struct pn533_cmd *cmd, *n;
2677
2678         nfc_unregister_device(priv->nfc_dev);
2679         nfc_free_device(priv->nfc_dev);
2680
2681         flush_delayed_work(&priv->poll_work);
2682         destroy_workqueue(priv->wq);
2683
2684         skb_queue_purge(&priv->resp_q);
2685
2686         del_timer(&priv->listen_timer);
2687
2688         list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2689                 list_del(&cmd->queue);
2690                 kfree(cmd);
2691         }
2692
2693         kfree(priv);
2694 }
2695 EXPORT_SYMBOL_GPL(pn533_unregister_device);
2696
2697
2698 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
2699 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2700 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
2701 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2702 MODULE_VERSION(VERSION);
2703 MODULE_LICENSE("GPL");