drivers/nfc/pn533/pn533.c

   1 /*
   2  * Driver for NXP PN533 NFC Chip - core functions
   3  *
   4  * Copyright (C) 2011 Instituto Nokia de Tecnologia
   5  * Copyright (C) 2012-2013 Tieto Poland
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <linux/device.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/nfc.h>
  26 #include <linux/netdevice.h>
  27 #include <net/nfc/nfc.h>
  28 #include "pn533.h"
  29
  30 #define VERSION "0.3"
  31
  32 /* How much time we spend listening for initiators */
  33 #define PN533_LISTEN_TIME 2
  34 /* Delay between each poll frame (ms) */
  35 #define PN533_POLL_INTERVAL 10
  36
  37 /* structs for pn533 commands */
  38
  39 /* PN533_CMD_GET_FIRMWARE_VERSION */
  40 struct pn533_fw_version {
  41         u8 ic;
  42         u8 ver;
  43         u8 rev;
  44         u8 support;
  45 };
  46
  47 /* PN533_CMD_RF_CONFIGURATION */
  48 #define PN533_CFGITEM_RF_FIELD    0x01
  49 #define PN533_CFGITEM_TIMING      0x02
  50 #define PN533_CFGITEM_MAX_RETRIES 0x05
  51 #define PN533_CFGITEM_PASORI      0x82
  52
  53 #define PN533_CFGITEM_RF_FIELD_AUTO_RFCA 0x2
  54 #define PN533_CFGITEM_RF_FIELD_ON        0x1
  55 #define PN533_CFGITEM_RF_FIELD_OFF       0x0
  56
  57 #define PN533_CONFIG_TIMING_102 0xb
  58 #define PN533_CONFIG_TIMING_204 0xc
  59 #define PN533_CONFIG_TIMING_409 0xd
  60 #define PN533_CONFIG_TIMING_819 0xe
  61
  62 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
  63 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
  64
  65 struct pn533_config_max_retries {
  66         u8 mx_rty_atr;
  67         u8 mx_rty_psl;
  68         u8 mx_rty_passive_act;
  69 } __packed;
  70
  71 struct pn533_config_timing {
  72         u8 rfu;
  73         u8 atr_res_timeout;
  74         u8 dep_timeout;
  75 } __packed;
  76
  77 /* PN533_CMD_IN_LIST_PASSIVE_TARGET */
  78
  79 /* felica commands opcode */
  80 #define PN533_FELICA_OPC_SENSF_REQ 0
  81 #define PN533_FELICA_OPC_SENSF_RES 1
  82 /* felica SENSF_REQ parameters */
  83 #define PN533_FELICA_SENSF_SC_ALL 0xFFFF
  84 #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
  85 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
  86 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
  87
  88 /* type B initiator_data values */
  89 #define PN533_TYPE_B_AFI_ALL_FAMILIES 0
  90 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
  91 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
  92
  93 union pn533_cmd_poll_initdata {
  94         struct {
  95                 u8 afi;
  96                 u8 polling_method;
  97         } __packed type_b;
  98         struct {
  99                 u8 opcode;
 100                 __be16 sc;
 101                 u8 rc;
 102                 u8 tsn;
 103         } __packed felica;
 104 };
 105
 106 struct pn533_poll_modulations {
 107         struct {
 108                 u8 maxtg;
 109                 u8 brty;
 110                 union pn533_cmd_poll_initdata initiator_data;
 111         } __packed data;
 112         u8 len;
 113 };
 114
 115 static const struct pn533_poll_modulations poll_mod[] = {
 116         [PN533_POLL_MOD_106KBPS_A] = {
 117                 .data = {
 118                         .maxtg = 1,
 119                         .brty = 0,
 120                 },
 121                 .len = 2,
 122         },
 123         [PN533_POLL_MOD_212KBPS_FELICA] = {
 124                 .data = {
 125                         .maxtg = 1,
 126                         .brty = 1,
 127                         .initiator_data.felica = {
 128                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
 129                                 .sc = PN533_FELICA_SENSF_SC_ALL,
 130                                 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
 131                                 .tsn = 0x03,
 132                         },
 133                 },
 134                 .len = 7,
 135         },
 136         [PN533_POLL_MOD_424KBPS_FELICA] = {
 137                 .data = {
 138                         .maxtg = 1,
 139                         .brty = 2,
 140                         .initiator_data.felica = {
 141                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
 142                                 .sc = PN533_FELICA_SENSF_SC_ALL,
 143                                 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
 144                                 .tsn = 0x03,
 145                         },
 146                  },
 147                 .len = 7,
 148         },
 149         [PN533_POLL_MOD_106KBPS_JEWEL] = {
 150                 .data = {
 151                         .maxtg = 1,
 152                         .brty = 4,
 153                 },
 154                 .len = 2,
 155         },
 156         [PN533_POLL_MOD_847KBPS_B] = {
 157                 .data = {
 158                         .maxtg = 1,
 159                         .brty = 8,
 160                         .initiator_data.type_b = {
 161                                 .afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
 162                                 .polling_method =
 163                                         PN533_TYPE_B_POLL_METHOD_TIMESLOT,
 164                         },
 165                 },
 166                 .len = 3,
 167         },
 168         [PN533_LISTEN_MOD] = {
 169                 .len = 0,
 170         },
 171 };
 172
 173 /* PN533_CMD_IN_ATR */
 174
 175 struct pn533_cmd_activate_response {
 176         u8 status;
 177         u8 nfcid3t[10];
 178         u8 didt;
 179         u8 bst;
 180         u8 brt;
 181         u8 to;
 182         u8 ppt;
 183         /* optional */
 184         u8 gt[];
 185 } __packed;
 186
 187 struct pn533_cmd_jump_dep_response {
 188         u8 status;
 189         u8 tg;
 190         u8 nfcid3t[10];
 191         u8 didt;
 192         u8 bst;
 193         u8 brt;
 194         u8 to;
 195         u8 ppt;
 196         /* optional */
 197         u8 gt[];
 198 } __packed;
 199
 200
 201 /* PN533_TG_INIT_AS_TARGET */
 202 #define PN533_INIT_TARGET_PASSIVE 0x1
 203 #define PN533_INIT_TARGET_DEP 0x2
 204
 205 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
 206 #define PN533_INIT_TARGET_RESP_ACTIVE     0x1
 207 #define PN533_INIT_TARGET_RESP_DEP        0x4
 208
 209 /* The rule: value(high byte) + value(low byte) + checksum = 0 */
 210 static inline u8 pn533_ext_checksum(u16 value)
 211 {
 212         return ~(u8)(((value & 0xFF00) >> 8) + (u8)(value & 0xFF)) + 1;
 213 }
 214
 215 /* The rule: value + checksum = 0 */
 216 static inline u8 pn533_std_checksum(u8 value)
 217 {
 218         return ~value + 1;
 219 }
 220
 221 /* The rule: sum(data elements) + checksum = 0 */
 222 static u8 pn533_std_data_checksum(u8 *data, int datalen)
 223 {
 224         u8 sum = 0;
 225         int i;
 226
 227         for (i = 0; i < datalen; i++)
 228                 sum += data[i];
 229
 230         return pn533_std_checksum(sum);
 231 }
 232
 233 static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code)
 234 {
 235         struct pn533_std_frame *frame = _frame;
 236
 237         frame->preamble = 0;
 238         frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF);
 239         PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT;
 240         PN533_FRAME_CMD(frame) = cmd_code;
 241         frame->datalen = 2;
 242 }
 243
 244 static void pn533_std_tx_frame_finish(void *_frame)
 245 {
 246         struct pn533_std_frame *frame = _frame;
 247
 248         frame->datalen_checksum = pn533_std_checksum(frame->datalen);
 249
 250         PN533_STD_FRAME_CHECKSUM(frame) =
 251                 pn533_std_data_checksum(frame->data, frame->datalen);
 252
 253         PN533_STD_FRAME_POSTAMBLE(frame) = 0;
 254 }
 255
 256 static void pn533_std_tx_update_payload_len(void *_frame, int len)
 257 {
 258         struct pn533_std_frame *frame = _frame;
 259
 260         frame->datalen += len;
 261 }
 262
 263 static bool pn533_std_rx_frame_is_valid(void *_frame, struct pn533 *dev)
 264 {
 265         u8 checksum;
 266         struct pn533_std_frame *stdf = _frame;
 267
 268         if (stdf->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
 269                 return false;
 270
 271         if (likely(!PN533_STD_IS_EXTENDED(stdf))) {
 272                 /* Standard frame code */
 273                 dev->ops->rx_header_len = PN533_STD_FRAME_HEADER_LEN;
 274
 275                 checksum = pn533_std_checksum(stdf->datalen);
 276                 if (checksum != stdf->datalen_checksum)
 277                         return false;
 278
 279                 checksum = pn533_std_data_checksum(stdf->data, stdf->datalen);
 280                 if (checksum != PN533_STD_FRAME_CHECKSUM(stdf))
 281                         return false;
 282         } else {
 283                 /* Extended */
 284                 struct pn533_ext_frame *eif = _frame;
 285
 286                 dev->ops->rx_header_len = PN533_EXT_FRAME_HEADER_LEN;
 287
 288                 checksum = pn533_ext_checksum(be16_to_cpu(eif->datalen));
 289                 if (checksum != eif->datalen_checksum)
 290                         return false;
 291
 292                 /* check data checksum */
 293                 checksum = pn533_std_data_checksum(eif->data,
 294                                                    be16_to_cpu(eif->datalen));
 295                 if (checksum != PN533_EXT_FRAME_CHECKSUM(eif))
 296                         return false;
 297         }
 298
 299         return true;
 300 }
 301
 302 bool pn533_rx_frame_is_ack(void *_frame)
 303 {
 304         struct pn533_std_frame *frame = _frame;
 305
 306         if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
 307                 return false;
 308
 309         if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
 310                 return false;
 311
 312         return true;
 313 }
 314 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_ack);
 315
 316 static inline int pn533_std_rx_frame_size(void *frame)
 317 {
 318         struct pn533_std_frame *f = frame;
 319
 320         /* check for Extended Information frame */
 321         if (PN533_STD_IS_EXTENDED(f)) {
 322                 struct pn533_ext_frame *eif = frame;
 323
 324                 return sizeof(struct pn533_ext_frame)
 325                         + be16_to_cpu(eif->datalen) + PN533_STD_FRAME_TAIL_LEN;
 326         }
 327
 328         return sizeof(struct pn533_std_frame) + f->datalen +
 329                PN533_STD_FRAME_TAIL_LEN;
 330 }
 331
 332 static u8 pn533_std_get_cmd_code(void *frame)
 333 {
 334         struct pn533_std_frame *f = frame;
 335         struct pn533_ext_frame *eif = frame;
 336
 337         if (PN533_STD_IS_EXTENDED(f))
 338                 return PN533_FRAME_CMD(eif);
 339         else
 340                 return PN533_FRAME_CMD(f);
 341 }
 342
 343 bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
 344 {
 345         return (dev->ops->get_cmd_code(frame) ==
 346                                 PN533_CMD_RESPONSE(dev->cmd->code));
 347 }
 348 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_cmd_response);
 349
 350
 351 static struct pn533_frame_ops pn533_std_frame_ops = {
 352         .tx_frame_init = pn533_std_tx_frame_init,
 353         .tx_frame_finish = pn533_std_tx_frame_finish,
 354         .tx_update_payload_len = pn533_std_tx_update_payload_len,
 355         .tx_header_len = PN533_STD_FRAME_HEADER_LEN,
 356         .tx_tail_len = PN533_STD_FRAME_TAIL_LEN,
 357
 358         .rx_is_frame_valid = pn533_std_rx_frame_is_valid,
 359         .rx_frame_size = pn533_std_rx_frame_size,
 360         .rx_header_len = PN533_STD_FRAME_HEADER_LEN,
 361         .rx_tail_len = PN533_STD_FRAME_TAIL_LEN,
 362
 363         .max_payload_len =  PN533_STD_FRAME_MAX_PAYLOAD_LEN,
 364         .get_cmd_code = pn533_std_get_cmd_code,
 365 };
 366
 367 static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
 368                                   struct sk_buff *skb)
 369 {
 370         /* payload is already there, just update datalen */
 371         int payload_len = skb->len;
 372         struct pn533_frame_ops *ops = dev->ops;
 373
 374
 375         skb_push(skb, ops->tx_header_len);
 376         skb_put(skb, ops->tx_tail_len);
 377
 378         ops->tx_frame_init(skb->data, cmd_code);
 379         ops->tx_update_payload_len(skb->data, payload_len);
 380         ops->tx_frame_finish(skb->data);
 381 }
 382
 383 static int pn533_send_async_complete(struct pn533 *dev)
 384 {
 385         struct pn533_cmd *cmd = dev->cmd;
 386         struct sk_buff *resp;
 387         int status, rc = 0;
 388
 389         if (!cmd) {
 390                 dev_dbg(dev->dev, "%s: cmd not set\n", __func__);
 391                 goto done;
 392         }
 393
 394         dev_kfree_skb(cmd->req);
 395
 396         status = cmd->status;
 397         resp = cmd->resp;
 398
 399         if (status < 0) {
 400                 rc = cmd->complete_cb(dev, cmd->complete_cb_context,
 401                                       ERR_PTR(status));
 402                 dev_kfree_skb(resp);
 403                 goto done;
 404         }
 405
 406         /* when no response is set we got interrupted */
 407         if (!resp)
 408                 resp = ERR_PTR(-EINTR);
 409
 410         if (!IS_ERR(resp)) {
 411                 skb_pull(resp, dev->ops->rx_header_len);
 412                 skb_trim(resp, resp->len - dev->ops->rx_tail_len);
 413         }
 414
 415         rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp);
 416
 417 done:
 418         kfree(cmd);
 419         dev->cmd = NULL;
 420         return rc;
 421 }
 422
 423 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
 424                               struct sk_buff *req,
 425                               pn533_send_async_complete_t complete_cb,
 426                               void *complete_cb_context)
 427 {
 428         struct pn533_cmd *cmd;
 429         int rc = 0;
 430
 431         dev_dbg(dev->dev, "Sending command 0x%x\n", cmd_code);
 432
 433         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 434         if (!cmd)
 435                 return -ENOMEM;
 436
 437         cmd->code = cmd_code;
 438         cmd->req = req;
 439         cmd->complete_cb = complete_cb;
 440         cmd->complete_cb_context = complete_cb_context;
 441
 442         pn533_build_cmd_frame(dev, cmd_code, req);
 443
 444         mutex_lock(&dev->cmd_lock);
 445
 446         if (!dev->cmd_pending) {
 447                 dev->cmd = cmd;
 448                 rc = dev->phy_ops->send_frame(dev, req);
 449                 if (rc) {
 450                         dev->cmd = NULL;
 451                         goto error;
 452                 }
 453
 454                 dev->cmd_pending = 1;
 455                 goto unlock;
 456         }
 457
 458         dev_dbg(dev->dev, "%s Queueing command 0x%x\n",
 459                 __func__, cmd_code);
 460
 461         INIT_LIST_HEAD(&cmd->queue);
 462         list_add_tail(&cmd->queue, &dev->cmd_queue);
 463
 464         goto unlock;
 465
 466 error:
 467         kfree(cmd);
 468 unlock:
 469         mutex_unlock(&dev->cmd_lock);
 470         return rc;
 471 }
 472
 473 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
 474                                  struct sk_buff *req,
 475                                  pn533_send_async_complete_t complete_cb,
 476                                  void *complete_cb_context)
 477 {
 478         int rc;
 479
 480         rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
 481                                 complete_cb_context);
 482
 483         return rc;
 484 }
 485
 486 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
 487                                 struct sk_buff *req,
 488                                 pn533_send_async_complete_t complete_cb,
 489                                 void *complete_cb_context)
 490 {
 491         int rc;
 492
 493         rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
 494                                 complete_cb_context);
 495
 496         return rc;
 497 }
 498
 499 /*
 500  * pn533_send_cmd_direct_async
 501  *
 502  * The function sends a piority cmd directly to the chip omitting the cmd
 503  * queue. It's intended to be used by chaining mechanism of received responses
 504  * where the host has to request every single chunk of data before scheduling
 505  * next cmd from the queue.
 506  */
 507 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
 508                                        struct sk_buff *req,
 509                                        pn533_send_async_complete_t complete_cb,
 510                                        void *complete_cb_context)
 511 {
 512         struct pn533_cmd *cmd;
 513         int rc;
 514
 515         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 516         if (!cmd)
 517                 return -ENOMEM;
 518
 519         cmd->code = cmd_code;
 520         cmd->req = req;
 521         cmd->complete_cb = complete_cb;
 522         cmd->complete_cb_context = complete_cb_context;
 523
 524         pn533_build_cmd_frame(dev, cmd_code, req);
 525
 526         dev->cmd = cmd;
 527         rc = dev->phy_ops->send_frame(dev, req);
 528         if (rc < 0) {
 529                 dev->cmd = NULL;
 530                 kfree(cmd);
 531         }
 532
 533         return rc;
 534 }
 535
 536 static void pn533_wq_cmd_complete(struct work_struct *work)
 537 {
 538         struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
 539         int rc;
 540
 541         rc = pn533_send_async_complete(dev);
 542         if (rc != -EINPROGRESS)
 543                 queue_work(dev->wq, &dev->cmd_work);
 544 }
 545
 546 static void pn533_wq_cmd(struct work_struct *work)
 547 {
 548         struct pn533 *dev = container_of(work, struct pn533, cmd_work);
 549         struct pn533_cmd *cmd;
 550         int rc;
 551
 552         mutex_lock(&dev->cmd_lock);
 553
 554         if (list_empty(&dev->cmd_queue)) {
 555                 dev->cmd_pending = 0;
 556                 mutex_unlock(&dev->cmd_lock);
 557                 return;
 558         }
 559
 560         cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
 561
 562         list_del(&cmd->queue);
 563
 564         mutex_unlock(&dev->cmd_lock);
 565
 566         dev->cmd = cmd;
 567         rc = dev->phy_ops->send_frame(dev, cmd->req);
 568         if (rc < 0) {
 569                 dev->cmd = NULL;
 570                 dev_kfree_skb(cmd->req);
 571                 kfree(cmd);
 572                 return;
 573         }
 574
 575 }
 576
 577 struct pn533_sync_cmd_response {
 578         struct sk_buff *resp;
 579         struct completion done;
 580 };
 581
 582 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
 583                                     struct sk_buff *resp)
 584 {
 585         struct pn533_sync_cmd_response *arg = _arg;
 586
 587         arg->resp = resp;
 588         complete(&arg->done);
 589
 590         return 0;
 591 }
 592
 593 /*  pn533_send_cmd_sync
 594  *
 595  *  Please note the req parameter is freed inside the function to
 596  *  limit a number of return value interpretations by the caller.
 597  *
 598  *  1. negative in case of error during TX path -> req should be freed
 599  *
 600  *  2. negative in case of error during RX path -> req should not be freed
 601  *     as it's been already freed at the beginning of RX path by
 602  *     async_complete_cb.
 603  *
 604  *  3. valid pointer in case of succesfult RX path
 605  *
 606  *  A caller has to check a return value with IS_ERR macro. If the test pass,
 607  *  the returned pointer is valid.
 608  *
 609  */
 610 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
 611                                                struct sk_buff *req)
 612 {
 613         int rc;
 614         struct pn533_sync_cmd_response arg;
 615
 616         init_completion(&arg.done);
 617
 618         rc = pn533_send_cmd_async(dev, cmd_code, req,
 619                                   pn533_send_sync_complete, &arg);
 620         if (rc) {
 621                 dev_kfree_skb(req);
 622                 return ERR_PTR(rc);
 623         }
 624
 625         wait_for_completion(&arg.done);
 626
 627         return arg.resp;
 628 }
 629
 630 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
 631 {
 632         struct sk_buff *skb;
 633
 634         skb = alloc_skb(dev->ops->tx_header_len +
 635                         size +
 636                         dev->ops->tx_tail_len, GFP_KERNEL);
 637
 638         if (skb)
 639                 skb_reserve(skb, dev->ops->tx_header_len);
 640
 641         return skb;
 642 }
 643
 644 struct pn533_target_type_a {
 645         __be16 sens_res;
 646         u8 sel_res;
 647         u8 nfcid_len;
 648         u8 nfcid_data[];
 649 } __packed;
 650
 651
 652 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
 653 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
 654 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
 655
 656 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
 657 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
 658
 659 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
 660 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
 661
 662 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
 663 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
 664 #define PN533_TYPE_A_SEL_PROT_DEP 2
 665 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
 666
 667 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
 668                                                         int target_data_len)
 669 {
 670         u8 ssd;
 671         u8 platconf;
 672
 673         if (target_data_len < sizeof(struct pn533_target_type_a))
 674                 return false;
 675
 676         /*
 677          * The length check of nfcid[] and ats[] are not being performed because
 678          * the values are not being used
 679          */
 680
 681         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
 682         ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
 683         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
 684
 685         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 686              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
 687             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 688              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
 689                 return false;
 690
 691         /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
 692         if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
 693                 return false;
 694
 695         return true;
 696 }
 697
 698 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
 699                                                         int tgt_data_len)
 700 {
 701         struct pn533_target_type_a *tgt_type_a;
 702
 703         tgt_type_a = (struct pn533_target_type_a *)tgt_data;
 704
 705         if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
 706                 return -EPROTO;
 707
 708         switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
 709         case PN533_TYPE_A_SEL_PROT_MIFARE:
 710                 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
 711                 break;
 712         case PN533_TYPE_A_SEL_PROT_ISO14443:
 713                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
 714                 break;
 715         case PN533_TYPE_A_SEL_PROT_DEP:
 716                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 717                 break;
 718         case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
 719                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
 720                                                         NFC_PROTO_NFC_DEP_MASK;
 721                 break;
 722         }
 723
 724         nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
 725         nfc_tgt->sel_res = tgt_type_a->sel_res;
 726         nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
 727         memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
 728
 729         return 0;
 730 }
 731
 732 struct pn533_target_felica {
 733         u8 pol_res;
 734         u8 opcode;
 735         u8 nfcid2[NFC_NFCID2_MAXSIZE];
 736         u8 pad[8];
 737         /* optional */
 738         u8 syst_code[];
 739 } __packed;
 740
 741 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
 742 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
 743
 744 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
 745                                                         int target_data_len)
 746 {
 747         if (target_data_len < sizeof(struct pn533_target_felica))
 748                 return false;
 749
 750         if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
 751                 return false;
 752
 753         return true;
 754 }
 755
 756 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
 757                                                         int tgt_data_len)
 758 {
 759         struct pn533_target_felica *tgt_felica;
 760
 761         tgt_felica = (struct pn533_target_felica *)tgt_data;
 762
 763         if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
 764                 return -EPROTO;
 765
 766         if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
 767             (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
 768                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 769         else
 770                 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
 771
 772         memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
 773         nfc_tgt->sensf_res_len = 9;
 774
 775         memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
 776         nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
 777
 778         return 0;
 779 }
 780
 781 struct pn533_target_jewel {
 782         __be16 sens_res;
 783         u8 jewelid[4];
 784 } __packed;
 785
 786 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
 787                                                         int target_data_len)
 788 {
 789         u8 ssd;
 790         u8 platconf;
 791
 792         if (target_data_len < sizeof(struct pn533_target_jewel))
 793                 return false;
 794
 795         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
 796         ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
 797         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
 798
 799         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 800              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
 801             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 802              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
 803                 return false;
 804
 805         return true;
 806 }
 807
 808 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
 809                                                         int tgt_data_len)
 810 {
 811         struct pn533_target_jewel *tgt_jewel;
 812
 813         tgt_jewel = (struct pn533_target_jewel *)tgt_data;
 814
 815         if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
 816                 return -EPROTO;
 817
 818         nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
 819         nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
 820         nfc_tgt->nfcid1_len = 4;
 821         memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
 822
 823         return 0;
 824 }
 825
 826 struct pn533_type_b_prot_info {
 827         u8 bitrate;
 828         u8 fsci_type;
 829         u8 fwi_adc_fo;
 830 } __packed;
 831
 832 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
 833 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
 834 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
 835
 836 struct pn533_type_b_sens_res {
 837         u8 opcode;
 838         u8 nfcid[4];
 839         u8 appdata[4];
 840         struct pn533_type_b_prot_info prot_info;
 841 } __packed;
 842
 843 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
 844
 845 struct pn533_target_type_b {
 846         struct pn533_type_b_sens_res sensb_res;
 847         u8 attrib_res_len;
 848         u8 attrib_res[];
 849 } __packed;
 850
 851 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
 852                                                         int target_data_len)
 853 {
 854         if (target_data_len < sizeof(struct pn533_target_type_b))
 855                 return false;
 856
 857         if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
 858                 return false;
 859
 860         if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
 861                                                 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
 862                 return false;
 863
 864         return true;
 865 }
 866
 867 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
 868                                                         int tgt_data_len)
 869 {
 870         struct pn533_target_type_b *tgt_type_b;
 871
 872         tgt_type_b = (struct pn533_target_type_b *)tgt_data;
 873
 874         if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
 875                 return -EPROTO;
 876
 877         nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
 878
 879         return 0;
 880 }
 881
 882 static void pn533_poll_reset_mod_list(struct pn533 *dev);
 883 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
 884                               int tgdata_len)
 885 {
 886         struct nfc_target nfc_tgt;
 887         int rc;
 888
 889         dev_dbg(dev->dev, "%s: modulation=%d\n",
 890                 __func__, dev->poll_mod_curr);
 891
 892         if (tg != 1)
 893                 return -EPROTO;
 894
 895         memset(&nfc_tgt, 0, sizeof(struct nfc_target));
 896
 897         switch (dev->poll_mod_curr) {
 898         case PN533_POLL_MOD_106KBPS_A:
 899                 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
 900                 break;
 901         case PN533_POLL_MOD_212KBPS_FELICA:
 902         case PN533_POLL_MOD_424KBPS_FELICA:
 903                 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
 904                 break;
 905         case PN533_POLL_MOD_106KBPS_JEWEL:
 906                 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
 907                 break;
 908         case PN533_POLL_MOD_847KBPS_B:
 909                 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
 910                 break;
 911         default:
 912                 nfc_err(dev->dev,
 913                         "Unknown current poll modulation\n");
 914                 return -EPROTO;
 915         }
 916
 917         if (rc)
 918                 return rc;
 919
 920         if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
 921                 dev_dbg(dev->dev,
 922                         "The Tg found doesn't have the desired protocol\n");
 923                 return -EAGAIN;
 924         }
 925
 926         dev_dbg(dev->dev,
 927                 "Target found - supported protocols: 0x%x\n",
 928                 nfc_tgt.supported_protocols);
 929
 930         dev->tgt_available_prots = nfc_tgt.supported_protocols;
 931
 932         pn533_poll_reset_mod_list(dev);
 933         nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
 934
 935         return 0;
 936 }
 937
 938 static inline void pn533_poll_next_mod(struct pn533 *dev)
 939 {
 940         dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
 941 }
 942
 943 static void pn533_poll_reset_mod_list(struct pn533 *dev)
 944 {
 945         dev->poll_mod_count = 0;
 946 }
 947
 948 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
 949 {
 950         dev->poll_mod_active[dev->poll_mod_count] =
 951                 (struct pn533_poll_modulations *)&poll_mod[mod_index];
 952         dev->poll_mod_count++;
 953 }
 954
 955 static void pn533_poll_create_mod_list(struct pn533 *dev,
 956                                        u32 im_protocols, u32 tm_protocols)
 957 {
 958         pn533_poll_reset_mod_list(dev);
 959
 960         if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
 961             (im_protocols & NFC_PROTO_ISO14443_MASK) ||
 962             (im_protocols & NFC_PROTO_NFC_DEP_MASK))
 963                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
 964
 965         if (im_protocols & NFC_PROTO_FELICA_MASK ||
 966             im_protocols & NFC_PROTO_NFC_DEP_MASK) {
 967                 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
 968                 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
 969         }
 970
 971         if (im_protocols & NFC_PROTO_JEWEL_MASK)
 972                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
 973
 974         if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
 975                 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
 976
 977         if (tm_protocols)
 978                 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
 979 }
 980
 981 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
 982 {
 983         u8 nbtg, tg, *tgdata;
 984         int rc, tgdata_len;
 985
 986         /* Toggle the DEP polling */
 987         if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK)
 988                 dev->poll_dep = 1;
 989
 990         nbtg = resp->data[0];
 991         tg = resp->data[1];
 992         tgdata = &resp->data[2];
 993         tgdata_len = resp->len - 2;  /* nbtg + tg */
 994
 995         if (nbtg) {
 996                 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
 997
 998                 /* We must stop the poll after a valid target found */
 999                 if (rc == 0)
1000                         return 0;
1001         }
1002
1003         return -EAGAIN;
1004 }
1005
1006 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1007 {
1008         struct sk_buff *skb;
1009         u8 *felica, *nfcid3, *gb;
1010
1011         u8 *gbytes = dev->gb;
1012         size_t gbytes_len = dev->gb_len;
1013
1014         u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1015                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1016                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1017                                 0xff, 0xff}; /* System code */
1018
1019         u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1020                                0x0, 0x0, 0x0,
1021                                0x40}; /* SEL_RES for DEP */
1022
1023         unsigned int skb_len = 36 + /*
1024                                      * mode (1), mifare (6),
1025                                      * felica (18), nfcid3 (10), gb_len (1)
1026                                      */
1027                                gbytes_len +
1028                                1;  /* len Tk*/
1029
1030         skb = pn533_alloc_skb(dev, skb_len);
1031         if (!skb)
1032                 return NULL;
1033
1034         /* DEP support only */
1035         *skb_put(skb, 1) = PN533_INIT_TARGET_DEP;
1036
1037         /* MIFARE params */
1038         memcpy(skb_put(skb, 6), mifare_params, 6);
1039
1040         /* Felica params */
1041         felica = skb_put(skb, 18);
1042         memcpy(felica, felica_params, 18);
1043         get_random_bytes(felica + 2, 6);
1044
1045         /* NFCID3 */
1046         nfcid3 = skb_put_zero(skb, 10);
1047         memcpy(nfcid3, felica, 8);
1048
1049         /* General bytes */
1050         *skb_put(skb, 1) = gbytes_len;
1051
1052         gb = skb_put(skb, gbytes_len);
1053         memcpy(gb, gbytes, gbytes_len);
1054
1055         /* Len Tk */
1056         *skb_put(skb, 1) = 0;
1057
1058         return skb;
1059 }
1060
1061 static void pn533_wq_tm_mi_recv(struct work_struct *work);
1062 static struct sk_buff *pn533_build_response(struct pn533 *dev);
1063
1064 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1065                                       struct sk_buff *resp)
1066 {
1067         struct sk_buff *skb;
1068         u8 status, ret, mi;
1069         int rc;
1070
1071         dev_dbg(dev->dev, "%s\n", __func__);
1072
1073         if (IS_ERR(resp)) {
1074                 skb_queue_purge(&dev->resp_q);
1075                 return PTR_ERR(resp);
1076         }
1077
1078         status = resp->data[0];
1079
1080         ret = status & PN533_CMD_RET_MASK;
1081         mi = status & PN533_CMD_MI_MASK;
1082
1083         skb_pull(resp, sizeof(status));
1084
1085         if (ret != PN533_CMD_RET_SUCCESS) {
1086                 rc = -EIO;
1087                 goto error;
1088         }
1089
1090         skb_queue_tail(&dev->resp_q, resp);
1091
1092         if (mi) {
1093                 queue_work(dev->wq, &dev->mi_tm_rx_work);
1094                 return -EINPROGRESS;
1095         }
1096
1097         skb = pn533_build_response(dev);
1098         if (!skb) {
1099                 rc = -EIO;
1100                 goto error;
1101         }
1102
1103         return nfc_tm_data_received(dev->nfc_dev, skb);
1104
1105 error:
1106         nfc_tm_deactivated(dev->nfc_dev);
1107         dev->tgt_mode = 0;
1108         skb_queue_purge(&dev->resp_q);
1109         dev_kfree_skb(resp);
1110
1111         return rc;
1112 }
1113
1114 static void pn533_wq_tm_mi_recv(struct work_struct *work)
1115 {
1116         struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work);
1117         struct sk_buff *skb;
1118         int rc;
1119
1120         dev_dbg(dev->dev, "%s\n", __func__);
1121
1122         skb = pn533_alloc_skb(dev, 0);
1123         if (!skb)
1124                 return;
1125
1126         rc = pn533_send_cmd_direct_async(dev,
1127                                         PN533_CMD_TG_GET_DATA,
1128                                         skb,
1129                                         pn533_tm_get_data_complete,
1130                                         NULL);
1131
1132         if (rc < 0)
1133                 dev_kfree_skb(skb);
1134 }
1135
1136 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
1137                                   struct sk_buff *resp);
1138 static void pn533_wq_tm_mi_send(struct work_struct *work)
1139 {
1140         struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
1141         struct sk_buff *skb;
1142         int rc;
1143
1144         dev_dbg(dev->dev, "%s\n", __func__);
1145
1146         /* Grab the first skb in the queue */
1147         skb = skb_dequeue(&dev->fragment_skb);
1148         if (skb == NULL) {      /* No more data */
1149                 /* Reset the queue for future use */
1150                 skb_queue_head_init(&dev->fragment_skb);
1151                 goto error;
1152         }
1153
1154         /* last entry - remove MI bit */
1155         if (skb_queue_len(&dev->fragment_skb) == 0) {
1156                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
1157                                         skb, pn533_tm_send_complete, NULL);
1158         } else
1159                 rc = pn533_send_cmd_direct_async(dev,
1160                                         PN533_CMD_TG_SET_META_DATA,
1161                                         skb, pn533_tm_send_complete, NULL);
1162
1163         if (rc == 0) /* success */
1164                 return;
1165
1166         dev_err(dev->dev,
1167                 "Error %d when trying to perform set meta data_exchange", rc);
1168
1169         dev_kfree_skb(skb);
1170
1171 error:
1172         dev->phy_ops->send_ack(dev, GFP_KERNEL);
1173         queue_work(dev->wq, &dev->cmd_work);
1174 }
1175
1176 static void pn533_wq_tg_get_data(struct work_struct *work)
1177 {
1178         struct pn533 *dev = container_of(work, struct pn533, tg_work);
1179         struct sk_buff *skb;
1180         int rc;
1181
1182         dev_dbg(dev->dev, "%s\n", __func__);
1183
1184         skb = pn533_alloc_skb(dev, 0);
1185         if (!skb)
1186                 return;
1187
1188         rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1189                                    pn533_tm_get_data_complete, NULL);
1190
1191         if (rc < 0)
1192                 dev_kfree_skb(skb);
1193 }
1194
1195 #define ATR_REQ_GB_OFFSET 17
1196 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1197 {
1198         u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1199         size_t gb_len;
1200         int rc;
1201
1202         dev_dbg(dev->dev, "%s\n", __func__);
1203
1204         if (resp->len < ATR_REQ_GB_OFFSET + 1)
1205                 return -EINVAL;
1206
1207         mode = resp->data[0];
1208         cmd = &resp->data[1];
1209
1210         dev_dbg(dev->dev, "Target mode 0x%x len %d\n",
1211                 mode, resp->len);
1212
1213         if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1214             PN533_INIT_TARGET_RESP_ACTIVE)
1215                 comm_mode = NFC_COMM_ACTIVE;
1216
1217         if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0)  /* Only DEP supported */
1218                 return -EOPNOTSUPP;
1219
1220         gb = cmd + ATR_REQ_GB_OFFSET;
1221         gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1222
1223         rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1224                               comm_mode, gb, gb_len);
1225         if (rc < 0) {
1226                 nfc_err(dev->dev,
1227                         "Error when signaling target activation\n");
1228                 return rc;
1229         }
1230
1231         dev->tgt_mode = 1;
1232         queue_work(dev->wq, &dev->tg_work);
1233
1234         return 0;
1235 }
1236
1237 static void pn533_listen_mode_timer(unsigned long data)
1238 {
1239         struct pn533 *dev = (struct pn533 *)data;
1240
1241         dev_dbg(dev->dev, "Listen mode timeout\n");
1242
1243         dev->cancel_listen = 1;
1244
1245         pn533_poll_next_mod(dev);
1246
1247         queue_delayed_work(dev->wq, &dev->poll_work,
1248                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1249 }
1250
1251 static int pn533_rf_complete(struct pn533 *dev, void *arg,
1252                              struct sk_buff *resp)
1253 {
1254         int rc = 0;
1255
1256         dev_dbg(dev->dev, "%s\n", __func__);
1257
1258         if (IS_ERR(resp)) {
1259                 rc = PTR_ERR(resp);
1260
1261                 nfc_err(dev->dev, "RF setting error %d\n", rc);
1262
1263                 return rc;
1264         }
1265
1266         queue_delayed_work(dev->wq, &dev->poll_work,
1267                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1268
1269         dev_kfree_skb(resp);
1270         return rc;
1271 }
1272
1273 static void pn533_wq_rf(struct work_struct *work)
1274 {
1275         struct pn533 *dev = container_of(work, struct pn533, rf_work);
1276         struct sk_buff *skb;
1277         int rc;
1278
1279         dev_dbg(dev->dev, "%s\n", __func__);
1280
1281         skb = pn533_alloc_skb(dev, 2);
1282         if (!skb)
1283                 return;
1284
1285         *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD;
1286         *skb_put(skb, 1) = PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
1287
1288         rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1289                                   pn533_rf_complete, NULL);
1290         if (rc < 0) {
1291                 dev_kfree_skb(skb);
1292                 nfc_err(dev->dev, "RF setting error %d\n", rc);
1293         }
1294 }
1295
1296 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg,
1297                                    struct sk_buff *resp)
1298 {
1299         struct pn533_cmd_jump_dep_response *rsp;
1300         struct nfc_target nfc_target;
1301         u8 target_gt_len;
1302         int rc;
1303
1304         if (IS_ERR(resp))
1305                 return PTR_ERR(resp);
1306
1307         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1308
1309         rc = rsp->status & PN533_CMD_RET_MASK;
1310         if (rc != PN533_CMD_RET_SUCCESS) {
1311                 /* Not target found, turn radio off */
1312                 queue_work(dev->wq, &dev->rf_work);
1313
1314                 dev_kfree_skb(resp);
1315                 return 0;
1316         }
1317
1318         dev_dbg(dev->dev, "Creating new target");
1319
1320         nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1321         nfc_target.nfcid1_len = 10;
1322         memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1323         rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1324         if (rc)
1325                 goto error;
1326
1327         dev->tgt_available_prots = 0;
1328         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1329
1330         /* ATR_RES general bytes are located at offset 17 */
1331         target_gt_len = resp->len - 17;
1332         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1333                                           rsp->gt, target_gt_len);
1334         if (!rc) {
1335                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1336                                         dev->nfc_dev->targets[0].idx,
1337                                         0, NFC_RF_INITIATOR);
1338
1339                 if (!rc)
1340                         pn533_poll_reset_mod_list(dev);
1341         }
1342 error:
1343         dev_kfree_skb(resp);
1344         return rc;
1345 }
1346
1347 #define PASSIVE_DATA_LEN 5
1348 static int pn533_poll_dep(struct nfc_dev *nfc_dev)
1349 {
1350         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1351         struct sk_buff *skb;
1352         int rc, skb_len;
1353         u8 *next, nfcid3[NFC_NFCID3_MAXSIZE];
1354         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1355
1356         dev_dbg(dev->dev, "%s", __func__);
1357
1358         if (!dev->gb) {
1359                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1360
1361                 if (!dev->gb || !dev->gb_len) {
1362                         dev->poll_dep = 0;
1363                         queue_work(dev->wq, &dev->rf_work);
1364                 }
1365         }
1366
1367         skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1368         skb_len += PASSIVE_DATA_LEN;
1369
1370         /* NFCID3 */
1371         skb_len += NFC_NFCID3_MAXSIZE;
1372         nfcid3[0] = 0x1;
1373         nfcid3[1] = 0xfe;
1374         get_random_bytes(nfcid3 + 2, 6);
1375
1376         skb = pn533_alloc_skb(dev, skb_len);
1377         if (!skb)
1378                 return -ENOMEM;
1379
1380         *skb_put(skb, 1) = 0x01;  /* Active */
1381         *skb_put(skb, 1) = 0x02;  /* 424 kbps */
1382
1383         next = skb_put(skb, 1);  /* Next */
1384         *next = 0;
1385
1386         /* Copy passive data */
1387         memcpy(skb_put(skb, PASSIVE_DATA_LEN), passive_data, PASSIVE_DATA_LEN);
1388         *next |= 1;
1389
1390         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1391         memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
1392                NFC_NFCID3_MAXSIZE);
1393         *next |= 2;
1394
1395         memcpy(skb_put(skb, dev->gb_len), 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         memcpy(skb_put(skb, mod->len), &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(skb, sizeof(u8)) = 1; /* TG */
1627         *skb_put(skb, sizeof(u8)) = 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(skb, 1) = 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(skb, 1) = !comm_mode;  /* ActPass */
1855         *skb_put(skb, 1) = 0x02;  /* 424 kbps */
1856
1857         next = skb_put(skb, 1);  /* Next */
1858         *next = 0;
1859
1860         /* Copy passive data */
1861         memcpy(skb_put(skb, PASSIVE_DATA_LEN), 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                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), nfcid3,
1870                        NFC_NFCID3_MAXSIZE);
1871         *next |= 2;
1872
1873         if (gb != NULL && gb_len > 0) {
1874                 memcpy(skb_put(skb, gb_len), gb, gb_len);
1875                 *next |= 4; /* We have some Gi */
1876         } else {
1877                 *next = 0;
1878         }
1879
1880         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
1881         if (!arg) {
1882                 dev_kfree_skb(skb);
1883                 return -ENOMEM;
1884         }
1885
1886         *arg = !comm_mode;
1887
1888         pn533_rf_field(dev->nfc_dev, 0);
1889
1890         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1891                                   pn533_in_dep_link_up_complete, arg);
1892
1893         if (rc < 0) {
1894                 dev_kfree_skb(skb);
1895                 kfree(arg);
1896         }
1897
1898         return rc;
1899 }
1900
1901 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
1902 {
1903         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1904
1905         dev_dbg(dev->dev, "%s\n", __func__);
1906
1907         pn533_poll_reset_mod_list(dev);
1908
1909         if (dev->tgt_mode || dev->tgt_active_prot)
1910                 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1911
1912         dev->tgt_active_prot = 0;
1913         dev->tgt_mode = 0;
1914
1915         skb_queue_purge(&dev->resp_q);
1916
1917         return 0;
1918 }
1919
1920 struct pn533_data_exchange_arg {
1921         data_exchange_cb_t cb;
1922         void *cb_context;
1923 };
1924
1925 static struct sk_buff *pn533_build_response(struct pn533 *dev)
1926 {
1927         struct sk_buff *skb, *tmp, *t;
1928         unsigned int skb_len = 0, tmp_len = 0;
1929
1930         dev_dbg(dev->dev, "%s\n", __func__);
1931
1932         if (skb_queue_empty(&dev->resp_q))
1933                 return NULL;
1934
1935         if (skb_queue_len(&dev->resp_q) == 1) {
1936                 skb = skb_dequeue(&dev->resp_q);
1937                 goto out;
1938         }
1939
1940         skb_queue_walk_safe(&dev->resp_q, tmp, t)
1941                 skb_len += tmp->len;
1942
1943         dev_dbg(dev->dev, "%s total length %d\n",
1944                 __func__, skb_len);
1945
1946         skb = alloc_skb(skb_len, GFP_KERNEL);
1947         if (skb == NULL)
1948                 goto out;
1949
1950         skb_put(skb, skb_len);
1951
1952         skb_queue_walk_safe(&dev->resp_q, tmp, t) {
1953                 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
1954                 tmp_len += tmp->len;
1955         }
1956
1957 out:
1958         skb_queue_purge(&dev->resp_q);
1959
1960         return skb;
1961 }
1962
1963 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
1964                                         struct sk_buff *resp)
1965 {
1966         struct pn533_data_exchange_arg *arg = _arg;
1967         struct sk_buff *skb;
1968         int rc = 0;
1969         u8 status, ret, mi;
1970
1971         dev_dbg(dev->dev, "%s\n", __func__);
1972
1973         if (IS_ERR(resp)) {
1974                 rc = PTR_ERR(resp);
1975                 goto _error;
1976         }
1977
1978         status = resp->data[0];
1979         ret = status & PN533_CMD_RET_MASK;
1980         mi = status & PN533_CMD_MI_MASK;
1981
1982         skb_pull(resp, sizeof(status));
1983
1984         if (ret != PN533_CMD_RET_SUCCESS) {
1985                 nfc_err(dev->dev,
1986                         "Exchanging data failed (error 0x%x)\n", ret);
1987                 rc = -EIO;
1988                 goto error;
1989         }
1990
1991         skb_queue_tail(&dev->resp_q, resp);
1992
1993         if (mi) {
1994                 dev->cmd_complete_mi_arg = arg;
1995                 queue_work(dev->wq, &dev->mi_rx_work);
1996                 return -EINPROGRESS;
1997         }
1998
1999         /* Prepare for the next round */
2000         if (skb_queue_len(&dev->fragment_skb) > 0) {
2001                 dev->cmd_complete_dep_arg = arg;
2002                 queue_work(dev->wq, &dev->mi_tx_work);
2003
2004                 return -EINPROGRESS;
2005         }
2006
2007         skb = pn533_build_response(dev);
2008         if (!skb) {
2009                 rc = -ENOMEM;
2010                 goto error;
2011         }
2012
2013         arg->cb(arg->cb_context, skb, 0);
2014         kfree(arg);
2015         return 0;
2016
2017 error:
2018         dev_kfree_skb(resp);
2019 _error:
2020         skb_queue_purge(&dev->resp_q);
2021         arg->cb(arg->cb_context, NULL, rc);
2022         kfree(arg);
2023         return rc;
2024 }
2025
2026 /*
2027  * Receive an incoming pn533 frame. skb contains only header and payload.
2028  * If skb == NULL, it is a notification that the link below is dead.
2029  */
2030 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2031 {
2032         if (!dev->cmd)
2033                 goto sched_wq;
2034
2035         dev->cmd->status = status;
2036
2037         if (status != 0) {
2038                 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2039                 goto sched_wq;
2040         }
2041
2042         if (skb == NULL) {
2043                 pr_err("NULL Frame -> link is dead\n");
2044                 goto sched_wq;
2045         }
2046
2047         if (pn533_rx_frame_is_ack(skb->data)) {
2048                 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2049                 dev_kfree_skb(skb);
2050                 return;
2051         }
2052
2053         print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2054                              dev->ops->rx_frame_size(skb->data), false);
2055
2056         if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2057                 nfc_err(dev->dev, "Received an invalid frame\n");
2058                 dev->cmd->status = -EIO;
2059         } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2060                 nfc_err(dev->dev, "It it not the response to the last command\n");
2061                 dev->cmd->status = -EIO;
2062         }
2063
2064         dev->cmd->resp = skb;
2065
2066 sched_wq:
2067         queue_work(dev->wq, &dev->cmd_complete_work);
2068 }
2069 EXPORT_SYMBOL(pn533_recv_frame);
2070
2071 /* Split the Tx skb into small chunks */
2072 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2073 {
2074         struct sk_buff *frag;
2075         int  frag_size;
2076
2077         do {
2078                 /* Remaining size */
2079                 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2080                         frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2081                 else
2082                         frag_size = skb->len;
2083
2084                 /* Allocate and reserve */
2085                 frag = pn533_alloc_skb(dev, frag_size);
2086                 if (!frag) {
2087                         skb_queue_purge(&dev->fragment_skb);
2088                         break;
2089                 }
2090
2091                 if (!dev->tgt_mode) {
2092                         /* Reserve the TG/MI byte */
2093                         skb_reserve(frag, 1);
2094
2095                         /* MI + TG */
2096                         if (frag_size  == PN533_CMD_DATAFRAME_MAXLEN)
2097                                 *skb_push(frag, sizeof(u8)) =
2098                                                         (PN533_CMD_MI_MASK | 1);
2099                         else
2100                                 *skb_push(frag, sizeof(u8)) =  1; /* TG */
2101                 }
2102
2103                 memcpy(skb_put(frag, frag_size), skb->data, frag_size);
2104
2105                 /* Reduce the size of incoming buffer */
2106                 skb_pull(skb, frag_size);
2107
2108                 /* Add this to skb_queue */
2109                 skb_queue_tail(&dev->fragment_skb, frag);
2110
2111         } while (skb->len > 0);
2112
2113         dev_kfree_skb(skb);
2114
2115         return skb_queue_len(&dev->fragment_skb);
2116 }
2117
2118 static int pn533_transceive(struct nfc_dev *nfc_dev,
2119                             struct nfc_target *target, struct sk_buff *skb,
2120                             data_exchange_cb_t cb, void *cb_context)
2121 {
2122         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2123         struct pn533_data_exchange_arg *arg = NULL;
2124         int rc;
2125
2126         dev_dbg(dev->dev, "%s\n", __func__);
2127
2128         if (!dev->tgt_active_prot) {
2129                 nfc_err(dev->dev,
2130                         "Can't exchange data if there is no active target\n");
2131                 rc = -EINVAL;
2132                 goto error;
2133         }
2134
2135         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2136         if (!arg) {
2137                 rc = -ENOMEM;
2138                 goto error;
2139         }
2140
2141         arg->cb = cb;
2142         arg->cb_context = cb_context;
2143
2144         switch (dev->device_type) {
2145         case PN533_DEVICE_PASORI:
2146                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2147                         rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2148                                                    skb,
2149                                                    pn533_data_exchange_complete,
2150                                                    arg);
2151
2152                         break;
2153                 }
2154         default:
2155                 /* jumbo frame ? */
2156                 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2157                         rc = pn533_fill_fragment_skbs(dev, skb);
2158                         if (rc <= 0)
2159                                 goto error;
2160
2161                         skb = skb_dequeue(&dev->fragment_skb);
2162                         if (!skb) {
2163                                 rc = -EIO;
2164                                 goto error;
2165                         }
2166                 } else {
2167                         *skb_push(skb, sizeof(u8)) =  1; /* TG */
2168                 }
2169
2170                 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2171                                            skb, pn533_data_exchange_complete,
2172                                            arg);
2173
2174                 break;
2175         }
2176
2177         if (rc < 0) /* rc from send_async */
2178                 goto error;
2179
2180         return 0;
2181
2182 error:
2183         kfree(arg);
2184         dev_kfree_skb(skb);
2185         return rc;
2186 }
2187
2188 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2189                                   struct sk_buff *resp)
2190 {
2191         u8 status;
2192
2193         dev_dbg(dev->dev, "%s\n", __func__);
2194
2195         if (IS_ERR(resp))
2196                 return PTR_ERR(resp);
2197
2198         status = resp->data[0];
2199
2200         /* Prepare for the next round */
2201         if (skb_queue_len(&dev->fragment_skb) > 0) {
2202                 queue_work(dev->wq, &dev->mi_tm_tx_work);
2203                 return -EINPROGRESS;
2204         }
2205         dev_kfree_skb(resp);
2206
2207         if (status != 0) {
2208                 nfc_tm_deactivated(dev->nfc_dev);
2209
2210                 dev->tgt_mode = 0;
2211
2212                 return 0;
2213         }
2214
2215         queue_work(dev->wq, &dev->tg_work);
2216
2217         return 0;
2218 }
2219
2220 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2221 {
2222         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2223         int rc;
2224
2225         dev_dbg(dev->dev, "%s\n", __func__);
2226
2227         /* let's split in multiple chunks if size's too big */
2228         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2229                 rc = pn533_fill_fragment_skbs(dev, skb);
2230                 if (rc <= 0)
2231                         goto error;
2232
2233                 /* get the first skb */
2234                 skb = skb_dequeue(&dev->fragment_skb);
2235                 if (!skb) {
2236                         rc = -EIO;
2237                         goto error;
2238                 }
2239
2240                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2241                                                 pn533_tm_send_complete, NULL);
2242         } else {
2243                 /* Send th skb */
2244                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2245                                                 pn533_tm_send_complete, NULL);
2246         }
2247
2248 error:
2249         if (rc < 0) {
2250                 dev_kfree_skb(skb);
2251                 skb_queue_purge(&dev->fragment_skb);
2252         }
2253
2254         return rc;
2255 }
2256
2257 static void pn533_wq_mi_recv(struct work_struct *work)
2258 {
2259         struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2260         struct sk_buff *skb;
2261         int rc;
2262
2263         dev_dbg(dev->dev, "%s\n", __func__);
2264
2265         skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2266         if (!skb)
2267                 goto error;
2268
2269         switch (dev->device_type) {
2270         case PN533_DEVICE_PASORI:
2271                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2272                         rc = pn533_send_cmd_direct_async(dev,
2273                                                 PN533_CMD_IN_COMM_THRU,
2274                                                 skb,
2275                                                 pn533_data_exchange_complete,
2276                                                  dev->cmd_complete_mi_arg);
2277
2278                         break;
2279                 }
2280         default:
2281                 *skb_put(skb, sizeof(u8)) =  1; /*TG*/
2282
2283                 rc = pn533_send_cmd_direct_async(dev,
2284                                                  PN533_CMD_IN_DATA_EXCHANGE,
2285                                                  skb,
2286                                                  pn533_data_exchange_complete,
2287                                                  dev->cmd_complete_mi_arg);
2288
2289                 break;
2290         }
2291
2292         if (rc == 0) /* success */
2293                 return;
2294
2295         nfc_err(dev->dev,
2296                 "Error %d when trying to perform data_exchange\n", rc);
2297
2298         dev_kfree_skb(skb);
2299         kfree(dev->cmd_complete_mi_arg);
2300
2301 error:
2302         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2303         queue_work(dev->wq, &dev->cmd_work);
2304 }
2305
2306 static void pn533_wq_mi_send(struct work_struct *work)
2307 {
2308         struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2309         struct sk_buff *skb;
2310         int rc;
2311
2312         dev_dbg(dev->dev, "%s\n", __func__);
2313
2314         /* Grab the first skb in the queue */
2315         skb = skb_dequeue(&dev->fragment_skb);
2316
2317         if (skb == NULL) {      /* No more data */
2318                 /* Reset the queue for future use */
2319                 skb_queue_head_init(&dev->fragment_skb);
2320                 goto error;
2321         }
2322
2323         switch (dev->device_type) {
2324         case PN533_DEVICE_PASORI:
2325                 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2326                         rc = -EIO;
2327                         break;
2328                 }
2329
2330                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2331                                                  skb,
2332                                                  pn533_data_exchange_complete,
2333                                                  dev->cmd_complete_dep_arg);
2334
2335                 break;
2336
2337         default:
2338                 /* Still some fragments? */
2339                 rc = pn533_send_cmd_direct_async(dev,
2340                                                  PN533_CMD_IN_DATA_EXCHANGE,
2341                                                  skb,
2342                                                  pn533_data_exchange_complete,
2343                                                  dev->cmd_complete_dep_arg);
2344
2345                 break;
2346         }
2347
2348         if (rc == 0) /* success */
2349                 return;
2350
2351         nfc_err(dev->dev,
2352                 "Error %d when trying to perform data_exchange\n", rc);
2353
2354         dev_kfree_skb(skb);
2355         kfree(dev->cmd_complete_dep_arg);
2356
2357 error:
2358         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2359         queue_work(dev->wq, &dev->cmd_work);
2360 }
2361
2362 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2363                                                                 u8 cfgdata_len)
2364 {
2365         struct sk_buff *skb;
2366         struct sk_buff *resp;
2367         int skb_len;
2368
2369         dev_dbg(dev->dev, "%s\n", __func__);
2370
2371         skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2372
2373         skb = pn533_alloc_skb(dev, skb_len);
2374         if (!skb)
2375                 return -ENOMEM;
2376
2377         *skb_put(skb, sizeof(cfgitem)) = cfgitem;
2378         memcpy(skb_put(skb, cfgdata_len), cfgdata, cfgdata_len);
2379
2380         resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2381         if (IS_ERR(resp))
2382                 return PTR_ERR(resp);
2383
2384         dev_kfree_skb(resp);
2385         return 0;
2386 }
2387
2388 static int pn533_get_firmware_version(struct pn533 *dev,
2389                                       struct pn533_fw_version *fv)
2390 {
2391         struct sk_buff *skb;
2392         struct sk_buff *resp;
2393
2394         skb = pn533_alloc_skb(dev, 0);
2395         if (!skb)
2396                 return -ENOMEM;
2397
2398         resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2399         if (IS_ERR(resp))
2400                 return PTR_ERR(resp);
2401
2402         fv->ic = resp->data[0];
2403         fv->ver = resp->data[1];
2404         fv->rev = resp->data[2];
2405         fv->support = resp->data[3];
2406
2407         dev_kfree_skb(resp);
2408         return 0;
2409 }
2410
2411 static int pn533_pasori_fw_reset(struct pn533 *dev)
2412 {
2413         struct sk_buff *skb;
2414         struct sk_buff *resp;
2415
2416         dev_dbg(dev->dev, "%s\n", __func__);
2417
2418         skb = pn533_alloc_skb(dev, sizeof(u8));
2419         if (!skb)
2420                 return -ENOMEM;
2421
2422         *skb_put(skb, sizeof(u8)) = 0x1;
2423
2424         resp = pn533_send_cmd_sync(dev, 0x18, skb);
2425         if (IS_ERR(resp))
2426                 return PTR_ERR(resp);
2427
2428         dev_kfree_skb(resp);
2429
2430         return 0;
2431 }
2432
2433 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2434 {
2435         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2436         u8 rf_field = !!rf;
2437         int rc;
2438
2439         rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2440
2441         rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2442                                      (u8 *)&rf_field, 1);
2443         if (rc) {
2444                 nfc_err(dev->dev, "Error on setting RF field\n");
2445                 return rc;
2446         }
2447
2448         return rc;
2449 }
2450
2451 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2452 {
2453         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2454         struct sk_buff *skb;
2455         struct sk_buff *resp;
2456
2457         skb = pn533_alloc_skb(dev, 1);
2458         if (!skb)
2459                 return -ENOMEM;
2460
2461         *skb_put(skb, 1) = 0x01;
2462
2463         resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2464         if (IS_ERR(resp))
2465                 return PTR_ERR(resp);
2466
2467         dev_kfree_skb(resp);
2468         return 0;
2469 }
2470
2471 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2472 {
2473         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2474
2475         if (dev->device_type == PN533_DEVICE_PN532) {
2476                 int rc = pn532_sam_configuration(nfc_dev);
2477
2478                 if (rc)
2479                         return rc;
2480         }
2481
2482         return pn533_rf_field(nfc_dev, 1);
2483 }
2484
2485 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2486 {
2487         return pn533_rf_field(nfc_dev, 0);
2488 }
2489
2490 static struct nfc_ops pn533_nfc_ops = {
2491         .dev_up = pn533_dev_up,
2492         .dev_down = pn533_dev_down,
2493         .dep_link_up = pn533_dep_link_up,
2494         .dep_link_down = pn533_dep_link_down,
2495         .start_poll = pn533_start_poll,
2496         .stop_poll = pn533_stop_poll,
2497         .activate_target = pn533_activate_target,
2498         .deactivate_target = pn533_deactivate_target,
2499         .im_transceive = pn533_transceive,
2500         .tm_send = pn533_tm_send,
2501 };
2502
2503 static int pn533_setup(struct pn533 *dev)
2504 {
2505         struct pn533_config_max_retries max_retries;
2506         struct pn533_config_timing timing;
2507         u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2508         int rc;
2509
2510         switch (dev->device_type) {
2511         case PN533_DEVICE_STD:
2512         case PN533_DEVICE_PASORI:
2513         case PN533_DEVICE_ACR122U:
2514         case PN533_DEVICE_PN532:
2515                 max_retries.mx_rty_atr = 0x2;
2516                 max_retries.mx_rty_psl = 0x1;
2517                 max_retries.mx_rty_passive_act =
2518                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2519
2520                 timing.rfu = PN533_CONFIG_TIMING_102;
2521                 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2522                 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2523
2524                 break;
2525
2526         default:
2527                 nfc_err(dev->dev, "Unknown device type %d\n",
2528                         dev->device_type);
2529                 return -EINVAL;
2530         }
2531
2532         rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2533                                      (u8 *)&max_retries, sizeof(max_retries));
2534         if (rc) {
2535                 nfc_err(dev->dev,
2536                         "Error on setting MAX_RETRIES config\n");
2537                 return rc;
2538         }
2539
2540
2541         rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2542                                      (u8 *)&timing, sizeof(timing));
2543         if (rc) {
2544                 nfc_err(dev->dev, "Error on setting RF timings\n");
2545                 return rc;
2546         }
2547
2548         switch (dev->device_type) {
2549         case PN533_DEVICE_STD:
2550         case PN533_DEVICE_PN532:
2551                 break;
2552
2553         case PN533_DEVICE_PASORI:
2554                 pn533_pasori_fw_reset(dev);
2555
2556                 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2557                                              pasori_cfg, 3);
2558                 if (rc) {
2559                         nfc_err(dev->dev,
2560                                 "Error while settings PASORI config\n");
2561                         return rc;
2562                 }
2563
2564                 pn533_pasori_fw_reset(dev);
2565
2566                 break;
2567         }
2568
2569         return 0;
2570 }
2571
2572 int pn533_finalize_setup(struct pn533 *dev)
2573 {
2574
2575         struct pn533_fw_version fw_ver;
2576         int rc;
2577
2578         memset(&fw_ver, 0, sizeof(fw_ver));
2579
2580         rc = pn533_get_firmware_version(dev, &fw_ver);
2581         if (rc) {
2582                 nfc_err(dev->dev, "Unable to get FW version\n");
2583                 return rc;
2584         }
2585
2586         nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2587                 fw_ver.ic, fw_ver.ver, fw_ver.rev);
2588
2589         rc = pn533_setup(dev);
2590         if (rc)
2591                 return rc;
2592
2593         return 0;
2594 }
2595 EXPORT_SYMBOL_GPL(pn533_finalize_setup);
2596
2597 struct pn533 *pn533_register_device(u32 device_type,
2598                                 u32 protocols,
2599                                 enum pn533_protocol_type protocol_type,
2600                                 void *phy,
2601                                 struct pn533_phy_ops *phy_ops,
2602                                 struct pn533_frame_ops *fops,
2603                                 struct device *dev,
2604                                 struct device *parent)
2605 {
2606         struct pn533 *priv;
2607         int rc = -ENOMEM;
2608
2609         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2610         if (!priv)
2611                 return ERR_PTR(-ENOMEM);
2612
2613         priv->phy = phy;
2614         priv->phy_ops = phy_ops;
2615         priv->dev = dev;
2616         if (fops != NULL)
2617                 priv->ops = fops;
2618         else
2619                 priv->ops = &pn533_std_frame_ops;
2620
2621         priv->protocol_type = protocol_type;
2622         priv->device_type = device_type;
2623
2624         mutex_init(&priv->cmd_lock);
2625
2626         INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2627         INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2628         INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2629         INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2630         INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2631         INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2632         INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2633         INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2634         INIT_WORK(&priv->rf_work, pn533_wq_rf);
2635         priv->wq = alloc_ordered_workqueue("pn533", 0);
2636         if (priv->wq == NULL)
2637                 goto error;
2638
2639         init_timer(&priv->listen_timer);
2640         priv->listen_timer.data = (unsigned long) priv;
2641         priv->listen_timer.function = pn533_listen_mode_timer;
2642
2643         skb_queue_head_init(&priv->resp_q);
2644         skb_queue_head_init(&priv->fragment_skb);
2645
2646         INIT_LIST_HEAD(&priv->cmd_queue);
2647
2648         priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2649                                            priv->ops->tx_header_len +
2650                                            PN533_CMD_DATAEXCH_HEAD_LEN,
2651                                            priv->ops->tx_tail_len);
2652         if (!priv->nfc_dev) {
2653                 rc = -ENOMEM;
2654                 goto destroy_wq;
2655         }
2656
2657         nfc_set_parent_dev(priv->nfc_dev, parent);
2658         nfc_set_drvdata(priv->nfc_dev, priv);
2659
2660         rc = nfc_register_device(priv->nfc_dev);
2661         if (rc)
2662                 goto free_nfc_dev;
2663
2664         return priv;
2665
2666 free_nfc_dev:
2667         nfc_free_device(priv->nfc_dev);
2668
2669 destroy_wq:
2670         destroy_workqueue(priv->wq);
2671 error:
2672         kfree(priv);
2673         return ERR_PTR(rc);
2674 }
2675 EXPORT_SYMBOL_GPL(pn533_register_device);
2676
2677 void pn533_unregister_device(struct pn533 *priv)
2678 {
2679         struct pn533_cmd *cmd, *n;
2680
2681         nfc_unregister_device(priv->nfc_dev);
2682         nfc_free_device(priv->nfc_dev);
2683
2684         flush_delayed_work(&priv->poll_work);
2685         destroy_workqueue(priv->wq);
2686
2687         skb_queue_purge(&priv->resp_q);
2688
2689         del_timer(&priv->listen_timer);
2690
2691         list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2692                 list_del(&cmd->queue);
2693                 kfree(cmd);
2694         }
2695
2696         kfree(priv);
2697 }
2698 EXPORT_SYMBOL_GPL(pn533_unregister_device);
2699
2700
2701 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
2702 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2703 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
2704 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2705 MODULE_VERSION(VERSION);
2706 MODULE_LICENSE("GPL");