drivers/nfc/pn533/pn533.c

   1 /*
   2  * Driver for NXP PN533 NFC Chip - core functions
   3  *
   4  * Copyright (C) 2011 Instituto Nokia de Tecnologia
   5  * Copyright (C) 2012-2013 Tieto Poland
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <linux/device.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/nfc.h>
  26 #include <linux/netdevice.h>
  27 #include <net/nfc/nfc.h>
  28 #include "pn533.h"
  29
  30 #define VERSION "0.3"
  31
  32 /* How much time we spend listening for initiators */
  33 #define PN533_LISTEN_TIME 2
  34 /* Delay between each poll frame (ms) */
  35 #define PN533_POLL_INTERVAL 10
  36
  37 /* structs for pn533 commands */
  38
  39 /* PN533_CMD_GET_FIRMWARE_VERSION */
  40 struct pn533_fw_version {
  41         u8 ic;
  42         u8 ver;
  43         u8 rev;
  44         u8 support;
  45 };
  46
  47 /* PN533_CMD_RF_CONFIGURATION */
  48 #define PN533_CFGITEM_RF_FIELD    0x01
  49 #define PN533_CFGITEM_TIMING      0x02
  50 #define PN533_CFGITEM_MAX_RETRIES 0x05
  51 #define PN533_CFGITEM_PASORI      0x82
  52
  53 #define PN533_CFGITEM_RF_FIELD_AUTO_RFCA 0x2
  54 #define PN533_CFGITEM_RF_FIELD_ON        0x1
  55 #define PN533_CFGITEM_RF_FIELD_OFF       0x0
  56
  57 #define PN533_CONFIG_TIMING_102 0xb
  58 #define PN533_CONFIG_TIMING_204 0xc
  59 #define PN533_CONFIG_TIMING_409 0xd
  60 #define PN533_CONFIG_TIMING_819 0xe
  61
  62 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
  63 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
  64
  65 struct pn533_config_max_retries {
  66         u8 mx_rty_atr;
  67         u8 mx_rty_psl;
  68         u8 mx_rty_passive_act;
  69 } __packed;
  70
  71 struct pn533_config_timing {
  72         u8 rfu;
  73         u8 atr_res_timeout;
  74         u8 dep_timeout;
  75 } __packed;
  76
  77 /* PN533_CMD_IN_LIST_PASSIVE_TARGET */
  78
  79 /* felica commands opcode */
  80 #define PN533_FELICA_OPC_SENSF_REQ 0
  81 #define PN533_FELICA_OPC_SENSF_RES 1
  82 /* felica SENSF_REQ parameters */
  83 #define PN533_FELICA_SENSF_SC_ALL 0xFFFF
  84 #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
  85 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
  86 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
  87
  88 /* type B initiator_data values */
  89 #define PN533_TYPE_B_AFI_ALL_FAMILIES 0
  90 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
  91 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
  92
  93 union pn533_cmd_poll_initdata {
  94         struct {
  95                 u8 afi;
  96                 u8 polling_method;
  97         } __packed type_b;
  98         struct {
  99                 u8 opcode;
 100                 __be16 sc;
 101                 u8 rc;
 102                 u8 tsn;
 103         } __packed felica;
 104 };
 105
 106 struct pn533_poll_modulations {
 107         struct {
 108                 u8 maxtg;
 109                 u8 brty;
 110                 union pn533_cmd_poll_initdata initiator_data;
 111         } __packed data;
 112         u8 len;
 113 };
 114
 115 static const struct pn533_poll_modulations poll_mod[] = {
 116         [PN533_POLL_MOD_106KBPS_A] = {
 117                 .data = {
 118                         .maxtg = 1,
 119                         .brty = 0,
 120                 },
 121                 .len = 2,
 122         },
 123         [PN533_POLL_MOD_212KBPS_FELICA] = {
 124                 .data = {
 125                         .maxtg = 1,
 126                         .brty = 1,
 127                         .initiator_data.felica = {
 128                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
 129                                 .sc = PN533_FELICA_SENSF_SC_ALL,
 130                                 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
 131                                 .tsn = 0x03,
 132                         },
 133                 },
 134                 .len = 7,
 135         },
 136         [PN533_POLL_MOD_424KBPS_FELICA] = {
 137                 .data = {
 138                         .maxtg = 1,
 139                         .brty = 2,
 140                         .initiator_data.felica = {
 141                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
 142                                 .sc = PN533_FELICA_SENSF_SC_ALL,
 143                                 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
 144                                 .tsn = 0x03,
 145                         },
 146                  },
 147                 .len = 7,
 148         },
 149         [PN533_POLL_MOD_106KBPS_JEWEL] = {
 150                 .data = {
 151                         .maxtg = 1,
 152                         .brty = 4,
 153                 },
 154                 .len = 2,
 155         },
 156         [PN533_POLL_MOD_847KBPS_B] = {
 157                 .data = {
 158                         .maxtg = 1,
 159                         .brty = 8,
 160                         .initiator_data.type_b = {
 161                                 .afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
 162                                 .polling_method =
 163                                         PN533_TYPE_B_POLL_METHOD_TIMESLOT,
 164                         },
 165                 },
 166                 .len = 3,
 167         },
 168         [PN533_LISTEN_MOD] = {
 169                 .len = 0,
 170         },
 171 };
 172
 173 /* PN533_CMD_IN_ATR */
 174
 175 struct pn533_cmd_activate_response {
 176         u8 status;
 177         u8 nfcid3t[10];
 178         u8 didt;
 179         u8 bst;
 180         u8 brt;
 181         u8 to;
 182         u8 ppt;
 183         /* optional */
 184         u8 gt[];
 185 } __packed;
 186
 187 struct pn533_cmd_jump_dep_response {
 188         u8 status;
 189         u8 tg;
 190         u8 nfcid3t[10];
 191         u8 didt;
 192         u8 bst;
 193         u8 brt;
 194         u8 to;
 195         u8 ppt;
 196         /* optional */
 197         u8 gt[];
 198 } __packed;
 199
 200
 201 /* PN533_TG_INIT_AS_TARGET */
 202 #define PN533_INIT_TARGET_PASSIVE 0x1
 203 #define PN533_INIT_TARGET_DEP 0x2
 204
 205 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
 206 #define PN533_INIT_TARGET_RESP_ACTIVE     0x1
 207 #define PN533_INIT_TARGET_RESP_DEP        0x4
 208
 209 /* The rule: value(high byte) + value(low byte) + checksum = 0 */
 210 static inline u8 pn533_ext_checksum(u16 value)
 211 {
 212         return ~(u8)(((value & 0xFF00) >> 8) + (u8)(value & 0xFF)) + 1;
 213 }
 214
 215 /* The rule: value + checksum = 0 */
 216 static inline u8 pn533_std_checksum(u8 value)
 217 {
 218         return ~value + 1;
 219 }
 220
 221 /* The rule: sum(data elements) + checksum = 0 */
 222 static u8 pn533_std_data_checksum(u8 *data, int datalen)
 223 {
 224         u8 sum = 0;
 225         int i;
 226
 227         for (i = 0; i < datalen; i++)
 228                 sum += data[i];
 229
 230         return pn533_std_checksum(sum);
 231 }
 232
 233 static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code)
 234 {
 235         struct pn533_std_frame *frame = _frame;
 236
 237         frame->preamble = 0;
 238         frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF);
 239         PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT;
 240         PN533_FRAME_CMD(frame) = cmd_code;
 241         frame->datalen = 2;
 242 }
 243
 244 static void pn533_std_tx_frame_finish(void *_frame)
 245 {
 246         struct pn533_std_frame *frame = _frame;
 247
 248         frame->datalen_checksum = pn533_std_checksum(frame->datalen);
 249
 250         PN533_STD_FRAME_CHECKSUM(frame) =
 251                 pn533_std_data_checksum(frame->data, frame->datalen);
 252
 253         PN533_STD_FRAME_POSTAMBLE(frame) = 0;
 254 }
 255
 256 static void pn533_std_tx_update_payload_len(void *_frame, int len)
 257 {
 258         struct pn533_std_frame *frame = _frame;
 259
 260         frame->datalen += len;
 261 }
 262
 263 static bool pn533_std_rx_frame_is_valid(void *_frame, struct pn533 *dev)
 264 {
 265         u8 checksum;
 266         struct pn533_std_frame *stdf = _frame;
 267
 268         if (stdf->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
 269                 return false;
 270
 271         if (likely(!PN533_STD_IS_EXTENDED(stdf))) {
 272                 /* Standard frame code */
 273                 dev->ops->rx_header_len = PN533_STD_FRAME_HEADER_LEN;
 274
 275                 checksum = pn533_std_checksum(stdf->datalen);
 276                 if (checksum != stdf->datalen_checksum)
 277                         return false;
 278
 279                 checksum = pn533_std_data_checksum(stdf->data, stdf->datalen);
 280                 if (checksum != PN533_STD_FRAME_CHECKSUM(stdf))
 281                         return false;
 282         } else {
 283                 /* Extended */
 284                 struct pn533_ext_frame *eif = _frame;
 285
 286                 dev->ops->rx_header_len = PN533_EXT_FRAME_HEADER_LEN;
 287
 288                 checksum = pn533_ext_checksum(be16_to_cpu(eif->datalen));
 289                 if (checksum != eif->datalen_checksum)
 290                         return false;
 291
 292                 /* check data checksum */
 293                 checksum = pn533_std_data_checksum(eif->data,
 294                                                    be16_to_cpu(eif->datalen));
 295                 if (checksum != PN533_EXT_FRAME_CHECKSUM(eif))
 296                         return false;
 297         }
 298
 299         return true;
 300 }
 301
 302 bool pn533_rx_frame_is_ack(void *_frame)
 303 {
 304         struct pn533_std_frame *frame = _frame;
 305
 306         if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
 307                 return false;
 308
 309         if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
 310                 return false;
 311
 312         return true;
 313 }
 314 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_ack);
 315
 316 static inline int pn533_std_rx_frame_size(void *frame)
 317 {
 318         struct pn533_std_frame *f = frame;
 319
 320         /* check for Extended Information frame */
 321         if (PN533_STD_IS_EXTENDED(f)) {
 322                 struct pn533_ext_frame *eif = frame;
 323
 324                 return sizeof(struct pn533_ext_frame)
 325                         + be16_to_cpu(eif->datalen) + PN533_STD_FRAME_TAIL_LEN;
 326         }
 327
 328         return sizeof(struct pn533_std_frame) + f->datalen +
 329                PN533_STD_FRAME_TAIL_LEN;
 330 }
 331
 332 static u8 pn533_std_get_cmd_code(void *frame)
 333 {
 334         struct pn533_std_frame *f = frame;
 335         struct pn533_ext_frame *eif = frame;
 336
 337         if (PN533_STD_IS_EXTENDED(f))
 338                 return PN533_FRAME_CMD(eif);
 339         else
 340                 return PN533_FRAME_CMD(f);
 341 }
 342
 343 bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
 344 {
 345         return (dev->ops->get_cmd_code(frame) ==
 346                                 PN533_CMD_RESPONSE(dev->cmd->code));
 347 }
 348 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_cmd_response);
 349
 350
 351 static struct pn533_frame_ops pn533_std_frame_ops = {
 352         .tx_frame_init = pn533_std_tx_frame_init,
 353         .tx_frame_finish = pn533_std_tx_frame_finish,
 354         .tx_update_payload_len = pn533_std_tx_update_payload_len,
 355         .tx_header_len = PN533_STD_FRAME_HEADER_LEN,
 356         .tx_tail_len = PN533_STD_FRAME_TAIL_LEN,
 357
 358         .rx_is_frame_valid = pn533_std_rx_frame_is_valid,
 359         .rx_frame_size = pn533_std_rx_frame_size,
 360         .rx_header_len = PN533_STD_FRAME_HEADER_LEN,
 361         .rx_tail_len = PN533_STD_FRAME_TAIL_LEN,
 362
 363         .max_payload_len =  PN533_STD_FRAME_MAX_PAYLOAD_LEN,
 364         .get_cmd_code = pn533_std_get_cmd_code,
 365 };
 366
 367 static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
 368                                   struct sk_buff *skb)
 369 {
 370         /* payload is already there, just update datalen */
 371         int payload_len = skb->len;
 372         struct pn533_frame_ops *ops = dev->ops;
 373
 374
 375         skb_push(skb, ops->tx_header_len);
 376         skb_put(skb, ops->tx_tail_len);
 377
 378         ops->tx_frame_init(skb->data, cmd_code);
 379         ops->tx_update_payload_len(skb->data, payload_len);
 380         ops->tx_frame_finish(skb->data);
 381 }
 382
 383 static int pn533_send_async_complete(struct pn533 *dev)
 384 {
 385         struct pn533_cmd *cmd = dev->cmd;
 386         struct sk_buff *resp;
 387         int status, rc = 0;
 388
 389         if (!cmd) {
 390                 dev_dbg(dev->dev, "%s: cmd not set\n", __func__);
 391                 goto done;
 392         }
 393
 394         dev_kfree_skb(cmd->req);
 395
 396         status = cmd->status;
 397         resp = cmd->resp;
 398
 399         if (status < 0) {
 400                 rc = cmd->complete_cb(dev, cmd->complete_cb_context,
 401                                       ERR_PTR(status));
 402                 dev_kfree_skb(resp);
 403                 goto done;
 404         }
 405
 406         /* when no response is set we got interrupted */
 407         if (!resp)
 408                 resp = ERR_PTR(-EINTR);
 409
 410         if (!IS_ERR(resp)) {
 411                 skb_pull(resp, dev->ops->rx_header_len);
 412                 skb_trim(resp, resp->len - dev->ops->rx_tail_len);
 413         }
 414
 415         rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp);
 416
 417 done:
 418         kfree(cmd);
 419         dev->cmd = NULL;
 420         return rc;
 421 }
 422
 423 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
 424                               struct sk_buff *req,
 425                               pn533_send_async_complete_t complete_cb,
 426                               void *complete_cb_context)
 427 {
 428         struct pn533_cmd *cmd;
 429         int rc = 0;
 430
 431         dev_dbg(dev->dev, "Sending command 0x%x\n", cmd_code);
 432
 433         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 434         if (!cmd)
 435                 return -ENOMEM;
 436
 437         cmd->code = cmd_code;
 438         cmd->req = req;
 439         cmd->complete_cb = complete_cb;
 440         cmd->complete_cb_context = complete_cb_context;
 441
 442         pn533_build_cmd_frame(dev, cmd_code, req);
 443
 444         mutex_lock(&dev->cmd_lock);
 445
 446         if (!dev->cmd_pending) {
 447                 dev->cmd = cmd;
 448                 rc = dev->phy_ops->send_frame(dev, req);
 449                 if (rc) {
 450                         dev->cmd = NULL;
 451                         goto error;
 452                 }
 453
 454                 dev->cmd_pending = 1;
 455                 goto unlock;
 456         }
 457
 458         dev_dbg(dev->dev, "%s Queueing command 0x%x\n",
 459                 __func__, cmd_code);
 460
 461         INIT_LIST_HEAD(&cmd->queue);
 462         list_add_tail(&cmd->queue, &dev->cmd_queue);
 463
 464         goto unlock;
 465
 466 error:
 467         kfree(cmd);
 468 unlock:
 469         mutex_unlock(&dev->cmd_lock);
 470         return rc;
 471 }
 472
 473 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
 474                                  struct sk_buff *req,
 475                                  pn533_send_async_complete_t complete_cb,
 476                                  void *complete_cb_context)
 477 {
 478         int rc;
 479
 480         rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
 481                                 complete_cb_context);
 482
 483         return rc;
 484 }
 485
 486 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
 487                                 struct sk_buff *req,
 488                                 pn533_send_async_complete_t complete_cb,
 489                                 void *complete_cb_context)
 490 {
 491         int rc;
 492
 493         rc = __pn533_send_async(dev, cmd_code, req, complete_cb,
 494                                 complete_cb_context);
 495
 496         return rc;
 497 }
 498
 499 /*
 500  * pn533_send_cmd_direct_async
 501  *
 502  * The function sends a piority cmd directly to the chip omitting the cmd
 503  * queue. It's intended to be used by chaining mechanism of received responses
 504  * where the host has to request every single chunk of data before scheduling
 505  * next cmd from the queue.
 506  */
 507 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
 508                                        struct sk_buff *req,
 509                                        pn533_send_async_complete_t complete_cb,
 510                                        void *complete_cb_context)
 511 {
 512         struct pn533_cmd *cmd;
 513         int rc;
 514
 515         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 516         if (!cmd)
 517                 return -ENOMEM;
 518
 519         cmd->code = cmd_code;
 520         cmd->req = req;
 521         cmd->complete_cb = complete_cb;
 522         cmd->complete_cb_context = complete_cb_context;
 523
 524         pn533_build_cmd_frame(dev, cmd_code, req);
 525
 526         dev->cmd = cmd;
 527         rc = dev->phy_ops->send_frame(dev, req);
 528         if (rc < 0) {
 529                 dev->cmd = NULL;
 530                 kfree(cmd);
 531         }
 532
 533         return rc;
 534 }
 535
 536 static void pn533_wq_cmd_complete(struct work_struct *work)
 537 {
 538         struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
 539         int rc;
 540
 541         rc = pn533_send_async_complete(dev);
 542         if (rc != -EINPROGRESS)
 543                 queue_work(dev->wq, &dev->cmd_work);
 544 }
 545
 546 static void pn533_wq_cmd(struct work_struct *work)
 547 {
 548         struct pn533 *dev = container_of(work, struct pn533, cmd_work);
 549         struct pn533_cmd *cmd;
 550         int rc;
 551
 552         mutex_lock(&dev->cmd_lock);
 553
 554         if (list_empty(&dev->cmd_queue)) {
 555                 dev->cmd_pending = 0;
 556                 mutex_unlock(&dev->cmd_lock);
 557                 return;
 558         }
 559
 560         cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
 561
 562         list_del(&cmd->queue);
 563
 564         mutex_unlock(&dev->cmd_lock);
 565
 566         dev->cmd = cmd;
 567         rc = dev->phy_ops->send_frame(dev, cmd->req);
 568         if (rc < 0) {
 569                 dev->cmd = NULL;
 570                 dev_kfree_skb(cmd->req);
 571                 kfree(cmd);
 572                 return;
 573         }
 574
 575 }
 576
 577 struct pn533_sync_cmd_response {
 578         struct sk_buff *resp;
 579         struct completion done;
 580 };
 581
 582 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
 583                                     struct sk_buff *resp)
 584 {
 585         struct pn533_sync_cmd_response *arg = _arg;
 586
 587         arg->resp = resp;
 588         complete(&arg->done);
 589
 590         return 0;
 591 }
 592
 593 /*  pn533_send_cmd_sync
 594  *
 595  *  Please note the req parameter is freed inside the function to
 596  *  limit a number of return value interpretations by the caller.
 597  *
 598  *  1. negative in case of error during TX path -> req should be freed
 599  *
 600  *  2. negative in case of error during RX path -> req should not be freed
 601  *     as it's been already freed at the beginning of RX path by
 602  *     async_complete_cb.
 603  *
 604  *  3. valid pointer in case of succesfult RX path
 605  *
 606  *  A caller has to check a return value with IS_ERR macro. If the test pass,
 607  *  the returned pointer is valid.
 608  *
 609  */
 610 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
 611                                                struct sk_buff *req)
 612 {
 613         int rc;
 614         struct pn533_sync_cmd_response arg;
 615
 616         init_completion(&arg.done);
 617
 618         rc = pn533_send_cmd_async(dev, cmd_code, req,
 619                                   pn533_send_sync_complete, &arg);
 620         if (rc) {
 621                 dev_kfree_skb(req);
 622                 return ERR_PTR(rc);
 623         }
 624
 625         wait_for_completion(&arg.done);
 626
 627         return arg.resp;
 628 }
 629
 630 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
 631 {
 632         struct sk_buff *skb;
 633
 634         skb = alloc_skb(dev->ops->tx_header_len +
 635                         size +
 636                         dev->ops->tx_tail_len, GFP_KERNEL);
 637
 638         if (skb)
 639                 skb_reserve(skb, dev->ops->tx_header_len);
 640
 641         return skb;
 642 }
 643
 644 struct pn533_target_type_a {
 645         __be16 sens_res;
 646         u8 sel_res;
 647         u8 nfcid_len;
 648         u8 nfcid_data[];
 649 } __packed;
 650
 651
 652 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
 653 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
 654 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
 655
 656 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
 657 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
 658
 659 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
 660 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
 661
 662 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
 663 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
 664 #define PN533_TYPE_A_SEL_PROT_DEP 2
 665 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
 666
 667 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
 668                                                         int target_data_len)
 669 {
 670         u8 ssd;
 671         u8 platconf;
 672
 673         if (target_data_len < sizeof(struct pn533_target_type_a))
 674                 return false;
 675
 676         /*
 677          * The length check of nfcid[] and ats[] are not being performed because
 678          * the values are not being used
 679          */
 680
 681         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
 682         ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
 683         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
 684
 685         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 686              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
 687             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 688              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
 689                 return false;
 690
 691         /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
 692         if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
 693                 return false;
 694
 695         if (type_a->nfcid_len > NFC_NFCID1_MAXSIZE)
 696                 return false;
 697
 698         return true;
 699 }
 700
 701 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
 702                                                         int tgt_data_len)
 703 {
 704         struct pn533_target_type_a *tgt_type_a;
 705
 706         tgt_type_a = (struct pn533_target_type_a *)tgt_data;
 707
 708         if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
 709                 return -EPROTO;
 710
 711         switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
 712         case PN533_TYPE_A_SEL_PROT_MIFARE:
 713                 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
 714                 break;
 715         case PN533_TYPE_A_SEL_PROT_ISO14443:
 716                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
 717                 break;
 718         case PN533_TYPE_A_SEL_PROT_DEP:
 719                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 720                 break;
 721         case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
 722                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
 723                                                         NFC_PROTO_NFC_DEP_MASK;
 724                 break;
 725         }
 726
 727         nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
 728         nfc_tgt->sel_res = tgt_type_a->sel_res;
 729         nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
 730         memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
 731
 732         return 0;
 733 }
 734
 735 struct pn533_target_felica {
 736         u8 pol_res;
 737         u8 opcode;
 738         u8 nfcid2[NFC_NFCID2_MAXSIZE];
 739         u8 pad[8];
 740         /* optional */
 741         u8 syst_code[];
 742 } __packed;
 743
 744 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
 745 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
 746
 747 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
 748                                                         int target_data_len)
 749 {
 750         if (target_data_len < sizeof(struct pn533_target_felica))
 751                 return false;
 752
 753         if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
 754                 return false;
 755
 756         return true;
 757 }
 758
 759 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
 760                                                         int tgt_data_len)
 761 {
 762         struct pn533_target_felica *tgt_felica;
 763
 764         tgt_felica = (struct pn533_target_felica *)tgt_data;
 765
 766         if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
 767                 return -EPROTO;
 768
 769         if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
 770             (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
 771                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 772         else
 773                 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
 774
 775         memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
 776         nfc_tgt->sensf_res_len = 9;
 777
 778         memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
 779         nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
 780
 781         return 0;
 782 }
 783
 784 struct pn533_target_jewel {
 785         __be16 sens_res;
 786         u8 jewelid[4];
 787 } __packed;
 788
 789 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
 790                                                         int target_data_len)
 791 {
 792         u8 ssd;
 793         u8 platconf;
 794
 795         if (target_data_len < sizeof(struct pn533_target_jewel))
 796                 return false;
 797
 798         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
 799         ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
 800         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
 801
 802         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 803              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
 804             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 805              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
 806                 return false;
 807
 808         return true;
 809 }
 810
 811 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
 812                                                         int tgt_data_len)
 813 {
 814         struct pn533_target_jewel *tgt_jewel;
 815
 816         tgt_jewel = (struct pn533_target_jewel *)tgt_data;
 817
 818         if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
 819                 return -EPROTO;
 820
 821         nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
 822         nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
 823         nfc_tgt->nfcid1_len = 4;
 824         memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
 825
 826         return 0;
 827 }
 828
 829 struct pn533_type_b_prot_info {
 830         u8 bitrate;
 831         u8 fsci_type;
 832         u8 fwi_adc_fo;
 833 } __packed;
 834
 835 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
 836 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
 837 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
 838
 839 struct pn533_type_b_sens_res {
 840         u8 opcode;
 841         u8 nfcid[4];
 842         u8 appdata[4];
 843         struct pn533_type_b_prot_info prot_info;
 844 } __packed;
 845
 846 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
 847
 848 struct pn533_target_type_b {
 849         struct pn533_type_b_sens_res sensb_res;
 850         u8 attrib_res_len;
 851         u8 attrib_res[];
 852 } __packed;
 853
 854 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
 855                                                         int target_data_len)
 856 {
 857         if (target_data_len < sizeof(struct pn533_target_type_b))
 858                 return false;
 859
 860         if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
 861                 return false;
 862
 863         if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
 864                                                 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
 865                 return false;
 866
 867         return true;
 868 }
 869
 870 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
 871                                                         int tgt_data_len)
 872 {
 873         struct pn533_target_type_b *tgt_type_b;
 874
 875         tgt_type_b = (struct pn533_target_type_b *)tgt_data;
 876
 877         if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
 878                 return -EPROTO;
 879
 880         nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
 881
 882         return 0;
 883 }
 884
 885 static void pn533_poll_reset_mod_list(struct pn533 *dev);
 886 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
 887                               int tgdata_len)
 888 {
 889         struct nfc_target nfc_tgt;
 890         int rc;
 891
 892         dev_dbg(dev->dev, "%s: modulation=%d\n",
 893                 __func__, dev->poll_mod_curr);
 894
 895         if (tg != 1)
 896                 return -EPROTO;
 897
 898         memset(&nfc_tgt, 0, sizeof(struct nfc_target));
 899
 900         switch (dev->poll_mod_curr) {
 901         case PN533_POLL_MOD_106KBPS_A:
 902                 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
 903                 break;
 904         case PN533_POLL_MOD_212KBPS_FELICA:
 905         case PN533_POLL_MOD_424KBPS_FELICA:
 906                 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
 907                 break;
 908         case PN533_POLL_MOD_106KBPS_JEWEL:
 909                 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
 910                 break;
 911         case PN533_POLL_MOD_847KBPS_B:
 912                 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
 913                 break;
 914         default:
 915                 nfc_err(dev->dev,
 916                         "Unknown current poll modulation\n");
 917                 return -EPROTO;
 918         }
 919
 920         if (rc)
 921                 return rc;
 922
 923         if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
 924                 dev_dbg(dev->dev,
 925                         "The Tg found doesn't have the desired protocol\n");
 926                 return -EAGAIN;
 927         }
 928
 929         dev_dbg(dev->dev,
 930                 "Target found - supported protocols: 0x%x\n",
 931                 nfc_tgt.supported_protocols);
 932
 933         dev->tgt_available_prots = nfc_tgt.supported_protocols;
 934
 935         pn533_poll_reset_mod_list(dev);
 936         nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
 937
 938         return 0;
 939 }
 940
 941 static inline void pn533_poll_next_mod(struct pn533 *dev)
 942 {
 943         dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
 944 }
 945
 946 static void pn533_poll_reset_mod_list(struct pn533 *dev)
 947 {
 948         dev->poll_mod_count = 0;
 949 }
 950
 951 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
 952 {
 953         dev->poll_mod_active[dev->poll_mod_count] =
 954                 (struct pn533_poll_modulations *)&poll_mod[mod_index];
 955         dev->poll_mod_count++;
 956 }
 957
 958 static void pn533_poll_create_mod_list(struct pn533 *dev,
 959                                        u32 im_protocols, u32 tm_protocols)
 960 {
 961         pn533_poll_reset_mod_list(dev);
 962
 963         if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
 964             (im_protocols & NFC_PROTO_ISO14443_MASK) ||
 965             (im_protocols & NFC_PROTO_NFC_DEP_MASK))
 966                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
 967
 968         if (im_protocols & NFC_PROTO_FELICA_MASK ||
 969             im_protocols & NFC_PROTO_NFC_DEP_MASK) {
 970                 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
 971                 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
 972         }
 973
 974         if (im_protocols & NFC_PROTO_JEWEL_MASK)
 975                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
 976
 977         if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
 978                 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
 979
 980         if (tm_protocols)
 981                 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
 982 }
 983
 984 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
 985 {
 986         u8 nbtg, tg, *tgdata;
 987         int rc, tgdata_len;
 988
 989         /* Toggle the DEP polling */
 990         if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK)
 991                 dev->poll_dep = 1;
 992
 993         nbtg = resp->data[0];
 994         tg = resp->data[1];
 995         tgdata = &resp->data[2];
 996         tgdata_len = resp->len - 2;  /* nbtg + tg */
 997
 998         if (nbtg) {
 999                 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1000
1001                 /* We must stop the poll after a valid target found */
1002                 if (rc == 0)
1003                         return 0;
1004         }
1005
1006         return -EAGAIN;
1007 }
1008
1009 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1010 {
1011         struct sk_buff *skb;
1012         u8 *felica, *nfcid3;
1013
1014         u8 *gbytes = dev->gb;
1015         size_t gbytes_len = dev->gb_len;
1016
1017         u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1018                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1019                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1020                                 0xff, 0xff}; /* System code */
1021
1022         u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1023                                0x0, 0x0, 0x0,
1024                                0x40}; /* SEL_RES for DEP */
1025
1026         unsigned int skb_len = 36 + /*
1027                                      * mode (1), mifare (6),
1028                                      * felica (18), nfcid3 (10), gb_len (1)
1029                                      */
1030                                gbytes_len +
1031                                1;  /* len Tk*/
1032
1033         skb = pn533_alloc_skb(dev, skb_len);
1034         if (!skb)
1035                 return NULL;
1036
1037         /* DEP support only */
1038         skb_put_u8(skb, PN533_INIT_TARGET_DEP);
1039
1040         /* MIFARE params */
1041         skb_put_data(skb, mifare_params, 6);
1042
1043         /* Felica params */
1044         felica = skb_put_data(skb, felica_params, 18);
1045         get_random_bytes(felica + 2, 6);
1046
1047         /* NFCID3 */
1048         nfcid3 = skb_put_zero(skb, 10);
1049         memcpy(nfcid3, felica, 8);
1050
1051         /* General bytes */
1052         skb_put_u8(skb, gbytes_len);
1053
1054         skb_put_data(skb, gbytes, gbytes_len);
1055
1056         /* Len Tk */
1057         skb_put_u8(skb, 0);
1058
1059         return skb;
1060 }
1061
1062 static void pn533_wq_tm_mi_recv(struct work_struct *work);
1063 static struct sk_buff *pn533_build_response(struct pn533 *dev);
1064
1065 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1066                                       struct sk_buff *resp)
1067 {
1068         struct sk_buff *skb;
1069         u8 status, ret, mi;
1070         int rc;
1071
1072         dev_dbg(dev->dev, "%s\n", __func__);
1073
1074         if (IS_ERR(resp)) {
1075                 skb_queue_purge(&dev->resp_q);
1076                 return PTR_ERR(resp);
1077         }
1078
1079         status = resp->data[0];
1080
1081         ret = status & PN533_CMD_RET_MASK;
1082         mi = status & PN533_CMD_MI_MASK;
1083
1084         skb_pull(resp, sizeof(status));
1085
1086         if (ret != PN533_CMD_RET_SUCCESS) {
1087                 rc = -EIO;
1088                 goto error;
1089         }
1090
1091         skb_queue_tail(&dev->resp_q, resp);
1092
1093         if (mi) {
1094                 queue_work(dev->wq, &dev->mi_tm_rx_work);
1095                 return -EINPROGRESS;
1096         }
1097
1098         skb = pn533_build_response(dev);
1099         if (!skb) {
1100                 rc = -EIO;
1101                 goto error;
1102         }
1103
1104         return nfc_tm_data_received(dev->nfc_dev, skb);
1105
1106 error:
1107         nfc_tm_deactivated(dev->nfc_dev);
1108         dev->tgt_mode = 0;
1109         skb_queue_purge(&dev->resp_q);
1110         dev_kfree_skb(resp);
1111
1112         return rc;
1113 }
1114
1115 static void pn533_wq_tm_mi_recv(struct work_struct *work)
1116 {
1117         struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work);
1118         struct sk_buff *skb;
1119         int rc;
1120
1121         dev_dbg(dev->dev, "%s\n", __func__);
1122
1123         skb = pn533_alloc_skb(dev, 0);
1124         if (!skb)
1125                 return;
1126
1127         rc = pn533_send_cmd_direct_async(dev,
1128                                         PN533_CMD_TG_GET_DATA,
1129                                         skb,
1130                                         pn533_tm_get_data_complete,
1131                                         NULL);
1132
1133         if (rc < 0)
1134                 dev_kfree_skb(skb);
1135 }
1136
1137 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
1138                                   struct sk_buff *resp);
1139 static void pn533_wq_tm_mi_send(struct work_struct *work)
1140 {
1141         struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
1142         struct sk_buff *skb;
1143         int rc;
1144
1145         dev_dbg(dev->dev, "%s\n", __func__);
1146
1147         /* Grab the first skb in the queue */
1148         skb = skb_dequeue(&dev->fragment_skb);
1149         if (skb == NULL) {      /* No more data */
1150                 /* Reset the queue for future use */
1151                 skb_queue_head_init(&dev->fragment_skb);
1152                 goto error;
1153         }
1154
1155         /* last entry - remove MI bit */
1156         if (skb_queue_len(&dev->fragment_skb) == 0) {
1157                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
1158                                         skb, pn533_tm_send_complete, NULL);
1159         } else
1160                 rc = pn533_send_cmd_direct_async(dev,
1161                                         PN533_CMD_TG_SET_META_DATA,
1162                                         skb, pn533_tm_send_complete, NULL);
1163
1164         if (rc == 0) /* success */
1165                 return;
1166
1167         dev_err(dev->dev,
1168                 "Error %d when trying to perform set meta data_exchange", rc);
1169
1170         dev_kfree_skb(skb);
1171
1172 error:
1173         dev->phy_ops->send_ack(dev, GFP_KERNEL);
1174         queue_work(dev->wq, &dev->cmd_work);
1175 }
1176
1177 static void pn533_wq_tg_get_data(struct work_struct *work)
1178 {
1179         struct pn533 *dev = container_of(work, struct pn533, tg_work);
1180         struct sk_buff *skb;
1181         int rc;
1182
1183         dev_dbg(dev->dev, "%s\n", __func__);
1184
1185         skb = pn533_alloc_skb(dev, 0);
1186         if (!skb)
1187                 return;
1188
1189         rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1190                                    pn533_tm_get_data_complete, NULL);
1191
1192         if (rc < 0)
1193                 dev_kfree_skb(skb);
1194 }
1195
1196 #define ATR_REQ_GB_OFFSET 17
1197 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1198 {
1199         u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1200         size_t gb_len;
1201         int rc;
1202
1203         dev_dbg(dev->dev, "%s\n", __func__);
1204
1205         if (resp->len < ATR_REQ_GB_OFFSET + 1)
1206                 return -EINVAL;
1207
1208         mode = resp->data[0];
1209         cmd = &resp->data[1];
1210
1211         dev_dbg(dev->dev, "Target mode 0x%x len %d\n",
1212                 mode, resp->len);
1213
1214         if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1215             PN533_INIT_TARGET_RESP_ACTIVE)
1216                 comm_mode = NFC_COMM_ACTIVE;
1217
1218         if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0)  /* Only DEP supported */
1219                 return -EOPNOTSUPP;
1220
1221         gb = cmd + ATR_REQ_GB_OFFSET;
1222         gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1223
1224         rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1225                               comm_mode, gb, gb_len);
1226         if (rc < 0) {
1227                 nfc_err(dev->dev,
1228                         "Error when signaling target activation\n");
1229                 return rc;
1230         }
1231
1232         dev->tgt_mode = 1;
1233         queue_work(dev->wq, &dev->tg_work);
1234
1235         return 0;
1236 }
1237
1238 static void pn533_listen_mode_timer(unsigned long data)
1239 {
1240         struct pn533 *dev = (struct pn533 *)data;
1241
1242         dev_dbg(dev->dev, "Listen mode timeout\n");
1243
1244         dev->cancel_listen = 1;
1245
1246         pn533_poll_next_mod(dev);
1247
1248         queue_delayed_work(dev->wq, &dev->poll_work,
1249                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1250 }
1251
1252 static int pn533_rf_complete(struct pn533 *dev, void *arg,
1253                              struct sk_buff *resp)
1254 {
1255         int rc = 0;
1256
1257         dev_dbg(dev->dev, "%s\n", __func__);
1258
1259         if (IS_ERR(resp)) {
1260                 rc = PTR_ERR(resp);
1261
1262                 nfc_err(dev->dev, "RF setting error %d\n", rc);
1263
1264                 return rc;
1265         }
1266
1267         queue_delayed_work(dev->wq, &dev->poll_work,
1268                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1269
1270         dev_kfree_skb(resp);
1271         return rc;
1272 }
1273
1274 static void pn533_wq_rf(struct work_struct *work)
1275 {
1276         struct pn533 *dev = container_of(work, struct pn533, rf_work);
1277         struct sk_buff *skb;
1278         int rc;
1279
1280         dev_dbg(dev->dev, "%s\n", __func__);
1281
1282         skb = pn533_alloc_skb(dev, 2);
1283         if (!skb)
1284                 return;
1285
1286         skb_put_u8(skb, PN533_CFGITEM_RF_FIELD);
1287         skb_put_u8(skb, PN533_CFGITEM_RF_FIELD_AUTO_RFCA);
1288
1289         rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1290                                   pn533_rf_complete, NULL);
1291         if (rc < 0) {
1292                 dev_kfree_skb(skb);
1293                 nfc_err(dev->dev, "RF setting error %d\n", rc);
1294         }
1295 }
1296
1297 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg,
1298                                    struct sk_buff *resp)
1299 {
1300         struct pn533_cmd_jump_dep_response *rsp;
1301         struct nfc_target nfc_target;
1302         u8 target_gt_len;
1303         int rc;
1304
1305         if (IS_ERR(resp))
1306                 return PTR_ERR(resp);
1307
1308         memset(&nfc_target, 0, sizeof(struct nfc_target));
1309
1310         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1311
1312         rc = rsp->status & PN533_CMD_RET_MASK;
1313         if (rc != PN533_CMD_RET_SUCCESS) {
1314                 /* Not target found, turn radio off */
1315                 queue_work(dev->wq, &dev->rf_work);
1316
1317                 dev_kfree_skb(resp);
1318                 return 0;
1319         }
1320
1321         dev_dbg(dev->dev, "Creating new target");
1322
1323         nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1324         nfc_target.nfcid1_len = 10;
1325         memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1326         rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1327         if (rc)
1328                 goto error;
1329
1330         dev->tgt_available_prots = 0;
1331         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1332
1333         /* ATR_RES general bytes are located at offset 17 */
1334         target_gt_len = resp->len - 17;
1335         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1336                                           rsp->gt, target_gt_len);
1337         if (!rc) {
1338                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1339                                         dev->nfc_dev->targets[0].idx,
1340                                         0, NFC_RF_INITIATOR);
1341
1342                 if (!rc)
1343                         pn533_poll_reset_mod_list(dev);
1344         }
1345 error:
1346         dev_kfree_skb(resp);
1347         return rc;
1348 }
1349
1350 #define PASSIVE_DATA_LEN 5
1351 static int pn533_poll_dep(struct nfc_dev *nfc_dev)
1352 {
1353         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1354         struct sk_buff *skb;
1355         int rc, skb_len;
1356         u8 *next, nfcid3[NFC_NFCID3_MAXSIZE];
1357         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1358
1359         dev_dbg(dev->dev, "%s", __func__);
1360
1361         if (!dev->gb) {
1362                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1363
1364                 if (!dev->gb || !dev->gb_len) {
1365                         dev->poll_dep = 0;
1366                         queue_work(dev->wq, &dev->rf_work);
1367                 }
1368         }
1369
1370         skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1371         skb_len += PASSIVE_DATA_LEN;
1372
1373         /* NFCID3 */
1374         skb_len += NFC_NFCID3_MAXSIZE;
1375         nfcid3[0] = 0x1;
1376         nfcid3[1] = 0xfe;
1377         get_random_bytes(nfcid3 + 2, 6);
1378
1379         skb = pn533_alloc_skb(dev, skb_len);
1380         if (!skb)
1381                 return -ENOMEM;
1382
1383         skb_put_u8(skb, 0x01);  /* Active */
1384         skb_put_u8(skb, 0x02);  /* 424 kbps */
1385
1386         next = skb_put(skb, 1);  /* Next */
1387         *next = 0;
1388
1389         /* Copy passive data */
1390         skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
1391         *next |= 1;
1392
1393         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1394         skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
1395         *next |= 2;
1396
1397         skb_put_data(skb, dev->gb, dev->gb_len);
1398         *next |= 4; /* We have some Gi */
1399
1400         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1401                                   pn533_poll_dep_complete, NULL);
1402
1403         if (rc < 0)
1404                 dev_kfree_skb(skb);
1405
1406         return rc;
1407 }
1408
1409 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1410                                struct sk_buff *resp)
1411 {
1412         struct pn533_poll_modulations *cur_mod;
1413         int rc;
1414
1415         dev_dbg(dev->dev, "%s\n", __func__);
1416
1417         if (IS_ERR(resp)) {
1418                 rc = PTR_ERR(resp);
1419
1420                 nfc_err(dev->dev, "%s  Poll complete error %d\n",
1421                         __func__, rc);
1422
1423                 if (rc == -ENOENT) {
1424                         if (dev->poll_mod_count != 0)
1425                                 return rc;
1426                         goto stop_poll;
1427                 } else if (rc < 0) {
1428                         nfc_err(dev->dev,
1429                                 "Error %d when running poll\n", rc);
1430                         goto stop_poll;
1431                 }
1432         }
1433
1434         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1435
1436         if (cur_mod->len == 0) { /* Target mode */
1437                 del_timer(&dev->listen_timer);
1438                 rc = pn533_init_target_complete(dev, resp);
1439                 goto done;
1440         }
1441
1442         /* Initiator mode */
1443         rc = pn533_start_poll_complete(dev, resp);
1444         if (!rc)
1445                 goto done;
1446
1447         if (!dev->poll_mod_count) {
1448                 dev_dbg(dev->dev, "Polling has been stopped\n");
1449                 goto done;
1450         }
1451
1452         pn533_poll_next_mod(dev);
1453         /* Not target found, turn radio off */
1454         queue_work(dev->wq, &dev->rf_work);
1455
1456 done:
1457         dev_kfree_skb(resp);
1458         return rc;
1459
1460 stop_poll:
1461         nfc_err(dev->dev, "Polling operation has been stopped\n");
1462
1463         pn533_poll_reset_mod_list(dev);
1464         dev->poll_protocols = 0;
1465         return rc;
1466 }
1467
1468 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1469                                         struct pn533_poll_modulations *mod)
1470 {
1471         struct sk_buff *skb;
1472
1473         skb = pn533_alloc_skb(dev, mod->len);
1474         if (!skb)
1475                 return NULL;
1476
1477         skb_put_data(skb, &mod->data, mod->len);
1478
1479         return skb;
1480 }
1481
1482 static int pn533_send_poll_frame(struct pn533 *dev)
1483 {
1484         struct pn533_poll_modulations *mod;
1485         struct sk_buff *skb;
1486         int rc;
1487         u8 cmd_code;
1488
1489         mod = dev->poll_mod_active[dev->poll_mod_curr];
1490
1491         dev_dbg(dev->dev, "%s mod len %d\n",
1492                 __func__, mod->len);
1493
1494         if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep)  {
1495                 dev->poll_dep = 0;
1496                 return pn533_poll_dep(dev->nfc_dev);
1497         }
1498
1499         if (mod->len == 0) {  /* Listen mode */
1500                 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1501                 skb = pn533_alloc_poll_tg_frame(dev);
1502         } else {  /* Polling mode */
1503                 cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
1504                 skb = pn533_alloc_poll_in_frame(dev, mod);
1505         }
1506
1507         if (!skb) {
1508                 nfc_err(dev->dev, "Failed to allocate skb\n");
1509                 return -ENOMEM;
1510         }
1511
1512         rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1513                                   NULL);
1514         if (rc < 0) {
1515                 dev_kfree_skb(skb);
1516                 nfc_err(dev->dev, "Polling loop error %d\n", rc);
1517         }
1518
1519         return rc;
1520 }
1521
1522 static void pn533_wq_poll(struct work_struct *work)
1523 {
1524         struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1525         struct pn533_poll_modulations *cur_mod;
1526         int rc;
1527
1528         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1529
1530         dev_dbg(dev->dev,
1531                 "%s cancel_listen %d modulation len %d\n",
1532                 __func__, dev->cancel_listen, cur_mod->len);
1533
1534         if (dev->cancel_listen == 1) {
1535                 dev->cancel_listen = 0;
1536                 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC);
1537         }
1538
1539         rc = pn533_send_poll_frame(dev);
1540         if (rc)
1541                 return;
1542
1543         if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1544                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1545 }
1546
1547 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1548                             u32 im_protocols, u32 tm_protocols)
1549 {
1550         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1551         struct pn533_poll_modulations *cur_mod;
1552         u8 rand_mod;
1553         int rc;
1554
1555         dev_dbg(dev->dev,
1556                 "%s: im protocols 0x%x tm protocols 0x%x\n",
1557                 __func__, im_protocols, tm_protocols);
1558
1559         if (dev->tgt_active_prot) {
1560                 nfc_err(dev->dev,
1561                         "Cannot poll with a target already activated\n");
1562                 return -EBUSY;
1563         }
1564
1565         if (dev->tgt_mode) {
1566                 nfc_err(dev->dev,
1567                         "Cannot poll while already being activated\n");
1568                 return -EBUSY;
1569         }
1570
1571         if (tm_protocols) {
1572                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1573                 if (dev->gb == NULL)
1574                         tm_protocols = 0;
1575         }
1576
1577         pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1578         dev->poll_protocols = im_protocols;
1579         dev->listen_protocols = tm_protocols;
1580
1581         /* Do not always start polling from the same modulation */
1582         get_random_bytes(&rand_mod, sizeof(rand_mod));
1583         rand_mod %= dev->poll_mod_count;
1584         dev->poll_mod_curr = rand_mod;
1585
1586         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1587
1588         rc = pn533_send_poll_frame(dev);
1589
1590         /* Start listen timer */
1591         if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
1592                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1593
1594         return rc;
1595 }
1596
1597 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1598 {
1599         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1600
1601         del_timer(&dev->listen_timer);
1602
1603         if (!dev->poll_mod_count) {
1604                 dev_dbg(dev->dev,
1605                         "Polling operation was not running\n");
1606                 return;
1607         }
1608
1609         dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1610         flush_delayed_work(&dev->poll_work);
1611         pn533_poll_reset_mod_list(dev);
1612 }
1613
1614 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1615 {
1616         struct pn533_cmd_activate_response *rsp;
1617         u16 gt_len;
1618         int rc;
1619         struct sk_buff *skb;
1620         struct sk_buff *resp;
1621
1622         dev_dbg(dev->dev, "%s\n", __func__);
1623
1624         skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1625         if (!skb)
1626                 return -ENOMEM;
1627
1628         skb_put_u8(skb, 1); /* TG */
1629         skb_put_u8(skb, 0); /* Next */
1630
1631         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1632         if (IS_ERR(resp))
1633                 return PTR_ERR(resp);
1634
1635         rsp = (struct pn533_cmd_activate_response *)resp->data;
1636         rc = rsp->status & PN533_CMD_RET_MASK;
1637         if (rc != PN533_CMD_RET_SUCCESS) {
1638                 nfc_err(dev->dev,
1639                         "Target activation failed (error 0x%x)\n", rc);
1640                 dev_kfree_skb(resp);
1641                 return -EIO;
1642         }
1643
1644         /* ATR_RES general bytes are located at offset 16 */
1645         gt_len = resp->len - 16;
1646         rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1647
1648         dev_kfree_skb(resp);
1649         return rc;
1650 }
1651
1652 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1653                                  struct nfc_target *target, u32 protocol)
1654 {
1655         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1656         int rc;
1657
1658         dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol);
1659
1660         if (dev->poll_mod_count) {
1661                 nfc_err(dev->dev,
1662                         "Cannot activate while polling\n");
1663                 return -EBUSY;
1664         }
1665
1666         if (dev->tgt_active_prot) {
1667                 nfc_err(dev->dev,
1668                         "There is already an active target\n");
1669                 return -EBUSY;
1670         }
1671
1672         if (!dev->tgt_available_prots) {
1673                 nfc_err(dev->dev,
1674                         "There is no available target to activate\n");
1675                 return -EINVAL;
1676         }
1677
1678         if (!(dev->tgt_available_prots & (1 << protocol))) {
1679                 nfc_err(dev->dev,
1680                         "Target doesn't support requested proto %u\n",
1681                         protocol);
1682                 return -EINVAL;
1683         }
1684
1685         if (protocol == NFC_PROTO_NFC_DEP) {
1686                 rc = pn533_activate_target_nfcdep(dev);
1687                 if (rc) {
1688                         nfc_err(dev->dev,
1689                                 "Activating target with DEP failed %d\n", rc);
1690                         return rc;
1691                 }
1692         }
1693
1694         dev->tgt_active_prot = protocol;
1695         dev->tgt_available_prots = 0;
1696
1697         return 0;
1698 }
1699
1700 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg,
1701                              struct sk_buff *resp)
1702 {
1703         int rc = 0;
1704
1705         dev_dbg(dev->dev, "%s\n", __func__);
1706
1707         if (IS_ERR(resp)) {
1708                 rc = PTR_ERR(resp);
1709
1710                 nfc_err(dev->dev, "Target release error %d\n", rc);
1711
1712                 return rc;
1713         }
1714
1715         rc = resp->data[0] & PN533_CMD_RET_MASK;
1716         if (rc != PN533_CMD_RET_SUCCESS)
1717                 nfc_err(dev->dev,
1718                         "Error 0x%x when releasing the target\n", rc);
1719
1720         dev_kfree_skb(resp);
1721         return rc;
1722 }
1723
1724 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1725                                     struct nfc_target *target, u8 mode)
1726 {
1727         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1728         struct sk_buff *skb;
1729         int rc;
1730
1731         dev_dbg(dev->dev, "%s\n", __func__);
1732
1733         if (!dev->tgt_active_prot) {
1734                 nfc_err(dev->dev, "There is no active target\n");
1735                 return;
1736         }
1737
1738         dev->tgt_active_prot = 0;
1739         skb_queue_purge(&dev->resp_q);
1740
1741         skb = pn533_alloc_skb(dev, sizeof(u8));
1742         if (!skb)
1743                 return;
1744
1745         skb_put_u8(skb, 1); /* TG*/
1746
1747         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb,
1748                                   pn533_deactivate_target_complete, NULL);
1749         if (rc < 0) {
1750                 dev_kfree_skb(skb);
1751                 nfc_err(dev->dev, "Target release error %d\n", rc);
1752         }
1753 }
1754
1755
1756 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1757                                          struct sk_buff *resp)
1758 {
1759         struct pn533_cmd_jump_dep_response *rsp;
1760         u8 target_gt_len;
1761         int rc;
1762         u8 active = *(u8 *)arg;
1763
1764         kfree(arg);
1765
1766         if (IS_ERR(resp))
1767                 return PTR_ERR(resp);
1768
1769         if (dev->tgt_available_prots &&
1770             !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1771                 nfc_err(dev->dev,
1772                         "The target does not support DEP\n");
1773                 rc =  -EINVAL;
1774                 goto error;
1775         }
1776
1777         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1778
1779         rc = rsp->status & PN533_CMD_RET_MASK;
1780         if (rc != PN533_CMD_RET_SUCCESS) {
1781                 nfc_err(dev->dev,
1782                         "Bringing DEP link up failed (error 0x%x)\n", rc);
1783                 goto error;
1784         }
1785
1786         if (!dev->tgt_available_prots) {
1787                 struct nfc_target nfc_target;
1788
1789                 dev_dbg(dev->dev, "Creating new target\n");
1790
1791                 memset(&nfc_target, 0, sizeof(struct nfc_target));
1792
1793                 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1794                 nfc_target.nfcid1_len = 10;
1795                 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1796                 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1797                 if (rc)
1798                         goto error;
1799
1800                 dev->tgt_available_prots = 0;
1801         }
1802
1803         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1804
1805         /* ATR_RES general bytes are located at offset 17 */
1806         target_gt_len = resp->len - 17;
1807         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1808                                           rsp->gt, target_gt_len);
1809         if (rc == 0)
1810                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1811                                         dev->nfc_dev->targets[0].idx,
1812                                         !active, NFC_RF_INITIATOR);
1813
1814 error:
1815         dev_kfree_skb(resp);
1816         return rc;
1817 }
1818
1819 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
1820 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1821                              u8 comm_mode, u8 *gb, size_t gb_len)
1822 {
1823         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1824         struct sk_buff *skb;
1825         int rc, skb_len;
1826         u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
1827         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1828
1829         dev_dbg(dev->dev, "%s\n", __func__);
1830
1831         if (dev->poll_mod_count) {
1832                 nfc_err(dev->dev,
1833                         "Cannot bring the DEP link up while polling\n");
1834                 return -EBUSY;
1835         }
1836
1837         if (dev->tgt_active_prot) {
1838                 nfc_err(dev->dev,
1839                         "There is already an active target\n");
1840                 return -EBUSY;
1841         }
1842
1843         skb_len = 3 + gb_len; /* ActPass + BR + Next */
1844         skb_len += PASSIVE_DATA_LEN;
1845
1846         /* NFCID3 */
1847         skb_len += NFC_NFCID3_MAXSIZE;
1848         if (target && !target->nfcid2_len) {
1849                 nfcid3[0] = 0x1;
1850                 nfcid3[1] = 0xfe;
1851                 get_random_bytes(nfcid3 + 2, 6);
1852         }
1853
1854         skb = pn533_alloc_skb(dev, skb_len);
1855         if (!skb)
1856                 return -ENOMEM;
1857
1858         skb_put_u8(skb, !comm_mode);  /* ActPass */
1859         skb_put_u8(skb, 0x02);  /* 424 kbps */
1860
1861         next = skb_put(skb, 1);  /* Next */
1862         *next = 0;
1863
1864         /* Copy passive data */
1865         skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
1866         *next |= 1;
1867
1868         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1869         if (target && target->nfcid2_len)
1870                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
1871                        target->nfcid2_len);
1872         else
1873                 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
1874         *next |= 2;
1875
1876         if (gb != NULL && gb_len > 0) {
1877                 skb_put_data(skb, gb, gb_len);
1878                 *next |= 4; /* We have some Gi */
1879         } else {
1880                 *next = 0;
1881         }
1882
1883         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
1884         if (!arg) {
1885                 dev_kfree_skb(skb);
1886                 return -ENOMEM;
1887         }
1888
1889         *arg = !comm_mode;
1890
1891         pn533_rf_field(dev->nfc_dev, 0);
1892
1893         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1894                                   pn533_in_dep_link_up_complete, arg);
1895
1896         if (rc < 0) {
1897                 dev_kfree_skb(skb);
1898                 kfree(arg);
1899         }
1900
1901         return rc;
1902 }
1903
1904 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
1905 {
1906         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1907
1908         dev_dbg(dev->dev, "%s\n", __func__);
1909
1910         pn533_poll_reset_mod_list(dev);
1911
1912         if (dev->tgt_mode || dev->tgt_active_prot)
1913                 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1914
1915         dev->tgt_active_prot = 0;
1916         dev->tgt_mode = 0;
1917
1918         skb_queue_purge(&dev->resp_q);
1919
1920         return 0;
1921 }
1922
1923 struct pn533_data_exchange_arg {
1924         data_exchange_cb_t cb;
1925         void *cb_context;
1926 };
1927
1928 static struct sk_buff *pn533_build_response(struct pn533 *dev)
1929 {
1930         struct sk_buff *skb, *tmp, *t;
1931         unsigned int skb_len = 0, tmp_len = 0;
1932
1933         dev_dbg(dev->dev, "%s\n", __func__);
1934
1935         if (skb_queue_empty(&dev->resp_q))
1936                 return NULL;
1937
1938         if (skb_queue_len(&dev->resp_q) == 1) {
1939                 skb = skb_dequeue(&dev->resp_q);
1940                 goto out;
1941         }
1942
1943         skb_queue_walk_safe(&dev->resp_q, tmp, t)
1944                 skb_len += tmp->len;
1945
1946         dev_dbg(dev->dev, "%s total length %d\n",
1947                 __func__, skb_len);
1948
1949         skb = alloc_skb(skb_len, GFP_KERNEL);
1950         if (skb == NULL)
1951                 goto out;
1952
1953         skb_put(skb, skb_len);
1954
1955         skb_queue_walk_safe(&dev->resp_q, tmp, t) {
1956                 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
1957                 tmp_len += tmp->len;
1958         }
1959
1960 out:
1961         skb_queue_purge(&dev->resp_q);
1962
1963         return skb;
1964 }
1965
1966 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
1967                                         struct sk_buff *resp)
1968 {
1969         struct pn533_data_exchange_arg *arg = _arg;
1970         struct sk_buff *skb;
1971         int rc = 0;
1972         u8 status, ret, mi;
1973
1974         dev_dbg(dev->dev, "%s\n", __func__);
1975
1976         if (IS_ERR(resp)) {
1977                 rc = PTR_ERR(resp);
1978                 goto _error;
1979         }
1980
1981         status = resp->data[0];
1982         ret = status & PN533_CMD_RET_MASK;
1983         mi = status & PN533_CMD_MI_MASK;
1984
1985         skb_pull(resp, sizeof(status));
1986
1987         if (ret != PN533_CMD_RET_SUCCESS) {
1988                 nfc_err(dev->dev,
1989                         "Exchanging data failed (error 0x%x)\n", ret);
1990                 rc = -EIO;
1991                 goto error;
1992         }
1993
1994         skb_queue_tail(&dev->resp_q, resp);
1995
1996         if (mi) {
1997                 dev->cmd_complete_mi_arg = arg;
1998                 queue_work(dev->wq, &dev->mi_rx_work);
1999                 return -EINPROGRESS;
2000         }
2001
2002         /* Prepare for the next round */
2003         if (skb_queue_len(&dev->fragment_skb) > 0) {
2004                 dev->cmd_complete_dep_arg = arg;
2005                 queue_work(dev->wq, &dev->mi_tx_work);
2006
2007                 return -EINPROGRESS;
2008         }
2009
2010         skb = pn533_build_response(dev);
2011         if (!skb) {
2012                 rc = -ENOMEM;
2013                 goto error;
2014         }
2015
2016         arg->cb(arg->cb_context, skb, 0);
2017         kfree(arg);
2018         return 0;
2019
2020 error:
2021         dev_kfree_skb(resp);
2022 _error:
2023         skb_queue_purge(&dev->resp_q);
2024         arg->cb(arg->cb_context, NULL, rc);
2025         kfree(arg);
2026         return rc;
2027 }
2028
2029 /*
2030  * Receive an incoming pn533 frame. skb contains only header and payload.
2031  * If skb == NULL, it is a notification that the link below is dead.
2032  */
2033 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2034 {
2035         if (!dev->cmd)
2036                 goto sched_wq;
2037
2038         dev->cmd->status = status;
2039
2040         if (status != 0) {
2041                 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2042                 goto sched_wq;
2043         }
2044
2045         if (skb == NULL) {
2046                 pr_err("NULL Frame -> link is dead\n");
2047                 goto sched_wq;
2048         }
2049
2050         if (pn533_rx_frame_is_ack(skb->data)) {
2051                 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2052                 dev_kfree_skb(skb);
2053                 return;
2054         }
2055
2056         print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2057                              dev->ops->rx_frame_size(skb->data), false);
2058
2059         if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2060                 nfc_err(dev->dev, "Received an invalid frame\n");
2061                 dev->cmd->status = -EIO;
2062         } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2063                 nfc_err(dev->dev, "It it not the response to the last command\n");
2064                 dev->cmd->status = -EIO;
2065         }
2066
2067         dev->cmd->resp = skb;
2068
2069 sched_wq:
2070         queue_work(dev->wq, &dev->cmd_complete_work);
2071 }
2072 EXPORT_SYMBOL(pn533_recv_frame);
2073
2074 /* Split the Tx skb into small chunks */
2075 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2076 {
2077         struct sk_buff *frag;
2078         int  frag_size;
2079
2080         do {
2081                 /* Remaining size */
2082                 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2083                         frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2084                 else
2085                         frag_size = skb->len;
2086
2087                 /* Allocate and reserve */
2088                 frag = pn533_alloc_skb(dev, frag_size);
2089                 if (!frag) {
2090                         skb_queue_purge(&dev->fragment_skb);
2091                         return -ENOMEM;
2092                 }
2093
2094                 if (!dev->tgt_mode) {
2095                         /* Reserve the TG/MI byte */
2096                         skb_reserve(frag, 1);
2097
2098                         /* MI + TG */
2099                         if (frag_size  == PN533_CMD_DATAFRAME_MAXLEN)
2100                                 *(u8 *)skb_push(frag, sizeof(u8)) =
2101                                                 (PN533_CMD_MI_MASK | 1);
2102                         else
2103                                 *(u8 *)skb_push(frag, sizeof(u8)) =  1; /* TG */
2104                 }
2105
2106                 skb_put_data(frag, skb->data, frag_size);
2107
2108                 /* Reduce the size of incoming buffer */
2109                 skb_pull(skb, frag_size);
2110
2111                 /* Add this to skb_queue */
2112                 skb_queue_tail(&dev->fragment_skb, frag);
2113
2114         } while (skb->len > 0);
2115
2116         dev_kfree_skb(skb);
2117
2118         return skb_queue_len(&dev->fragment_skb);
2119 }
2120
2121 static int pn533_transceive(struct nfc_dev *nfc_dev,
2122                             struct nfc_target *target, struct sk_buff *skb,
2123                             data_exchange_cb_t cb, void *cb_context)
2124 {
2125         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2126         struct pn533_data_exchange_arg *arg = NULL;
2127         int rc;
2128
2129         dev_dbg(dev->dev, "%s\n", __func__);
2130
2131         if (!dev->tgt_active_prot) {
2132                 nfc_err(dev->dev,
2133                         "Can't exchange data if there is no active target\n");
2134                 rc = -EINVAL;
2135                 goto error;
2136         }
2137
2138         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2139         if (!arg) {
2140                 rc = -ENOMEM;
2141                 goto error;
2142         }
2143
2144         arg->cb = cb;
2145         arg->cb_context = cb_context;
2146
2147         switch (dev->device_type) {
2148         case PN533_DEVICE_PASORI:
2149                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2150                         rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2151                                                    skb,
2152                                                    pn533_data_exchange_complete,
2153                                                    arg);
2154
2155                         break;
2156                 }
2157         default:
2158                 /* jumbo frame ? */
2159                 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2160                         rc = pn533_fill_fragment_skbs(dev, skb);
2161                         if (rc < 0)
2162                                 goto error;
2163
2164                         skb = skb_dequeue(&dev->fragment_skb);
2165                         if (!skb) {
2166                                 rc = -EIO;
2167                                 goto error;
2168                         }
2169                 } else {
2170                         *(u8 *)skb_push(skb, sizeof(u8)) =  1; /* TG */
2171                 }
2172
2173                 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2174                                            skb, pn533_data_exchange_complete,
2175                                            arg);
2176
2177                 break;
2178         }
2179
2180         if (rc < 0) /* rc from send_async */
2181                 goto error;
2182
2183         return 0;
2184
2185 error:
2186         kfree(arg);
2187         dev_kfree_skb(skb);
2188         return rc;
2189 }
2190
2191 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2192                                   struct sk_buff *resp)
2193 {
2194         u8 status;
2195
2196         dev_dbg(dev->dev, "%s\n", __func__);
2197
2198         if (IS_ERR(resp))
2199                 return PTR_ERR(resp);
2200
2201         status = resp->data[0];
2202
2203         /* Prepare for the next round */
2204         if (skb_queue_len(&dev->fragment_skb) > 0) {
2205                 queue_work(dev->wq, &dev->mi_tm_tx_work);
2206                 return -EINPROGRESS;
2207         }
2208         dev_kfree_skb(resp);
2209
2210         if (status != 0) {
2211                 nfc_tm_deactivated(dev->nfc_dev);
2212
2213                 dev->tgt_mode = 0;
2214
2215                 return 0;
2216         }
2217
2218         queue_work(dev->wq, &dev->tg_work);
2219
2220         return 0;
2221 }
2222
2223 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2224 {
2225         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2226         int rc;
2227
2228         dev_dbg(dev->dev, "%s\n", __func__);
2229
2230         /* let's split in multiple chunks if size's too big */
2231         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2232                 rc = pn533_fill_fragment_skbs(dev, skb);
2233                 if (rc < 0)
2234                         goto error;
2235
2236                 /* get the first skb */
2237                 skb = skb_dequeue(&dev->fragment_skb);
2238                 if (!skb) {
2239                         rc = -EIO;
2240                         goto error;
2241                 }
2242
2243                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2244                                                 pn533_tm_send_complete, NULL);
2245         } else {
2246                 /* Send th skb */
2247                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2248                                                 pn533_tm_send_complete, NULL);
2249         }
2250
2251 error:
2252         if (rc < 0) {
2253                 dev_kfree_skb(skb);
2254                 skb_queue_purge(&dev->fragment_skb);
2255         }
2256
2257         return rc;
2258 }
2259
2260 static void pn533_wq_mi_recv(struct work_struct *work)
2261 {
2262         struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2263         struct sk_buff *skb;
2264         int rc;
2265
2266         dev_dbg(dev->dev, "%s\n", __func__);
2267
2268         skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2269         if (!skb)
2270                 goto error;
2271
2272         switch (dev->device_type) {
2273         case PN533_DEVICE_PASORI:
2274                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2275                         rc = pn533_send_cmd_direct_async(dev,
2276                                                 PN533_CMD_IN_COMM_THRU,
2277                                                 skb,
2278                                                 pn533_data_exchange_complete,
2279                                                  dev->cmd_complete_mi_arg);
2280
2281                         break;
2282                 }
2283         default:
2284                 skb_put_u8(skb, 1); /*TG*/
2285
2286                 rc = pn533_send_cmd_direct_async(dev,
2287                                                  PN533_CMD_IN_DATA_EXCHANGE,
2288                                                  skb,
2289                                                  pn533_data_exchange_complete,
2290                                                  dev->cmd_complete_mi_arg);
2291
2292                 break;
2293         }
2294
2295         if (rc == 0) /* success */
2296                 return;
2297
2298         nfc_err(dev->dev,
2299                 "Error %d when trying to perform data_exchange\n", rc);
2300
2301         dev_kfree_skb(skb);
2302         kfree(dev->cmd_complete_mi_arg);
2303
2304 error:
2305         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2306         queue_work(dev->wq, &dev->cmd_work);
2307 }
2308
2309 static void pn533_wq_mi_send(struct work_struct *work)
2310 {
2311         struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2312         struct sk_buff *skb;
2313         int rc;
2314
2315         dev_dbg(dev->dev, "%s\n", __func__);
2316
2317         /* Grab the first skb in the queue */
2318         skb = skb_dequeue(&dev->fragment_skb);
2319
2320         if (skb == NULL) {      /* No more data */
2321                 /* Reset the queue for future use */
2322                 skb_queue_head_init(&dev->fragment_skb);
2323                 goto error;
2324         }
2325
2326         switch (dev->device_type) {
2327         case PN533_DEVICE_PASORI:
2328                 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2329                         rc = -EIO;
2330                         break;
2331                 }
2332
2333                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2334                                                  skb,
2335                                                  pn533_data_exchange_complete,
2336                                                  dev->cmd_complete_dep_arg);
2337
2338                 break;
2339
2340         default:
2341                 /* Still some fragments? */
2342                 rc = pn533_send_cmd_direct_async(dev,
2343                                                  PN533_CMD_IN_DATA_EXCHANGE,
2344                                                  skb,
2345                                                  pn533_data_exchange_complete,
2346                                                  dev->cmd_complete_dep_arg);
2347
2348                 break;
2349         }
2350
2351         if (rc == 0) /* success */
2352                 return;
2353
2354         nfc_err(dev->dev,
2355                 "Error %d when trying to perform data_exchange\n", rc);
2356
2357         dev_kfree_skb(skb);
2358         kfree(dev->cmd_complete_dep_arg);
2359
2360 error:
2361         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2362         queue_work(dev->wq, &dev->cmd_work);
2363 }
2364
2365 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2366                                                                 u8 cfgdata_len)
2367 {
2368         struct sk_buff *skb;
2369         struct sk_buff *resp;
2370         int skb_len;
2371
2372         dev_dbg(dev->dev, "%s\n", __func__);
2373
2374         skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2375
2376         skb = pn533_alloc_skb(dev, skb_len);
2377         if (!skb)
2378                 return -ENOMEM;
2379
2380         skb_put_u8(skb, cfgitem);
2381         skb_put_data(skb, cfgdata, cfgdata_len);
2382
2383         resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2384         if (IS_ERR(resp))
2385                 return PTR_ERR(resp);
2386
2387         dev_kfree_skb(resp);
2388         return 0;
2389 }
2390
2391 static int pn533_get_firmware_version(struct pn533 *dev,
2392                                       struct pn533_fw_version *fv)
2393 {
2394         struct sk_buff *skb;
2395         struct sk_buff *resp;
2396
2397         skb = pn533_alloc_skb(dev, 0);
2398         if (!skb)
2399                 return -ENOMEM;
2400
2401         resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2402         if (IS_ERR(resp))
2403                 return PTR_ERR(resp);
2404
2405         fv->ic = resp->data[0];
2406         fv->ver = resp->data[1];
2407         fv->rev = resp->data[2];
2408         fv->support = resp->data[3];
2409
2410         dev_kfree_skb(resp);
2411         return 0;
2412 }
2413
2414 static int pn533_pasori_fw_reset(struct pn533 *dev)
2415 {
2416         struct sk_buff *skb;
2417         struct sk_buff *resp;
2418
2419         dev_dbg(dev->dev, "%s\n", __func__);
2420
2421         skb = pn533_alloc_skb(dev, sizeof(u8));
2422         if (!skb)
2423                 return -ENOMEM;
2424
2425         skb_put_u8(skb, 0x1);
2426
2427         resp = pn533_send_cmd_sync(dev, 0x18, skb);
2428         if (IS_ERR(resp))
2429                 return PTR_ERR(resp);
2430
2431         dev_kfree_skb(resp);
2432
2433         return 0;
2434 }
2435
2436 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2437 {
2438         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2439         u8 rf_field = !!rf;
2440         int rc;
2441
2442         rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2443
2444         rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2445                                      (u8 *)&rf_field, 1);
2446         if (rc) {
2447                 nfc_err(dev->dev, "Error on setting RF field\n");
2448                 return rc;
2449         }
2450
2451         return rc;
2452 }
2453
2454 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2455 {
2456         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2457         struct sk_buff *skb;
2458         struct sk_buff *resp;
2459
2460         skb = pn533_alloc_skb(dev, 1);
2461         if (!skb)
2462                 return -ENOMEM;
2463
2464         skb_put_u8(skb, 0x01);
2465
2466         resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2467         if (IS_ERR(resp))
2468                 return PTR_ERR(resp);
2469
2470         dev_kfree_skb(resp);
2471         return 0;
2472 }
2473
2474 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2475 {
2476         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2477
2478         if (dev->device_type == PN533_DEVICE_PN532) {
2479                 int rc = pn532_sam_configuration(nfc_dev);
2480
2481                 if (rc)
2482                         return rc;
2483         }
2484
2485         return pn533_rf_field(nfc_dev, 1);
2486 }
2487
2488 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2489 {
2490         return pn533_rf_field(nfc_dev, 0);
2491 }
2492
2493 static struct nfc_ops pn533_nfc_ops = {
2494         .dev_up = pn533_dev_up,
2495         .dev_down = pn533_dev_down,
2496         .dep_link_up = pn533_dep_link_up,
2497         .dep_link_down = pn533_dep_link_down,
2498         .start_poll = pn533_start_poll,
2499         .stop_poll = pn533_stop_poll,
2500         .activate_target = pn533_activate_target,
2501         .deactivate_target = pn533_deactivate_target,
2502         .im_transceive = pn533_transceive,
2503         .tm_send = pn533_tm_send,
2504 };
2505
2506 static int pn533_setup(struct pn533 *dev)
2507 {
2508         struct pn533_config_max_retries max_retries;
2509         struct pn533_config_timing timing;
2510         u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2511         int rc;
2512
2513         switch (dev->device_type) {
2514         case PN533_DEVICE_STD:
2515         case PN533_DEVICE_PASORI:
2516         case PN533_DEVICE_ACR122U:
2517         case PN533_DEVICE_PN532:
2518                 max_retries.mx_rty_atr = 0x2;
2519                 max_retries.mx_rty_psl = 0x1;
2520                 max_retries.mx_rty_passive_act =
2521                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2522
2523                 timing.rfu = PN533_CONFIG_TIMING_102;
2524                 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2525                 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2526
2527                 break;
2528
2529         default:
2530                 nfc_err(dev->dev, "Unknown device type %d\n",
2531                         dev->device_type);
2532                 return -EINVAL;
2533         }
2534
2535         rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2536                                      (u8 *)&max_retries, sizeof(max_retries));
2537         if (rc) {
2538                 nfc_err(dev->dev,
2539                         "Error on setting MAX_RETRIES config\n");
2540                 return rc;
2541         }
2542
2543
2544         rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2545                                      (u8 *)&timing, sizeof(timing));
2546         if (rc) {
2547                 nfc_err(dev->dev, "Error on setting RF timings\n");
2548                 return rc;
2549         }
2550
2551         switch (dev->device_type) {
2552         case PN533_DEVICE_STD:
2553         case PN533_DEVICE_PN532:
2554                 break;
2555
2556         case PN533_DEVICE_PASORI:
2557                 pn533_pasori_fw_reset(dev);
2558
2559                 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2560                                              pasori_cfg, 3);
2561                 if (rc) {
2562                         nfc_err(dev->dev,
2563                                 "Error while settings PASORI config\n");
2564                         return rc;
2565                 }
2566
2567                 pn533_pasori_fw_reset(dev);
2568
2569                 break;
2570         }
2571
2572         return 0;
2573 }
2574
2575 int pn533_finalize_setup(struct pn533 *dev)
2576 {
2577
2578         struct pn533_fw_version fw_ver;
2579         int rc;
2580
2581         memset(&fw_ver, 0, sizeof(fw_ver));
2582
2583         rc = pn533_get_firmware_version(dev, &fw_ver);
2584         if (rc) {
2585                 nfc_err(dev->dev, "Unable to get FW version\n");
2586                 return rc;
2587         }
2588
2589         nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2590                 fw_ver.ic, fw_ver.ver, fw_ver.rev);
2591
2592         rc = pn533_setup(dev);
2593         if (rc)
2594                 return rc;
2595
2596         return 0;
2597 }
2598 EXPORT_SYMBOL_GPL(pn533_finalize_setup);
2599
2600 struct pn533 *pn533_register_device(u32 device_type,
2601                                 u32 protocols,
2602                                 enum pn533_protocol_type protocol_type,
2603                                 void *phy,
2604                                 struct pn533_phy_ops *phy_ops,
2605                                 struct pn533_frame_ops *fops,
2606                                 struct device *dev,
2607                                 struct device *parent)
2608 {
2609         struct pn533 *priv;
2610         int rc = -ENOMEM;
2611
2612         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2613         if (!priv)
2614                 return ERR_PTR(-ENOMEM);
2615
2616         priv->phy = phy;
2617         priv->phy_ops = phy_ops;
2618         priv->dev = dev;
2619         if (fops != NULL)
2620                 priv->ops = fops;
2621         else
2622                 priv->ops = &pn533_std_frame_ops;
2623
2624         priv->protocol_type = protocol_type;
2625         priv->device_type = device_type;
2626
2627         mutex_init(&priv->cmd_lock);
2628
2629         INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2630         INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2631         INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2632         INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2633         INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2634         INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2635         INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2636         INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2637         INIT_WORK(&priv->rf_work, pn533_wq_rf);
2638         priv->wq = alloc_ordered_workqueue("pn533", 0);
2639         if (priv->wq == NULL)
2640                 goto error;
2641
2642         init_timer(&priv->listen_timer);
2643         priv->listen_timer.data = (unsigned long) priv;
2644         priv->listen_timer.function = pn533_listen_mode_timer;
2645
2646         skb_queue_head_init(&priv->resp_q);
2647         skb_queue_head_init(&priv->fragment_skb);
2648
2649         INIT_LIST_HEAD(&priv->cmd_queue);
2650
2651         priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2652                                            priv->ops->tx_header_len +
2653                                            PN533_CMD_DATAEXCH_HEAD_LEN,
2654                                            priv->ops->tx_tail_len);
2655         if (!priv->nfc_dev) {
2656                 rc = -ENOMEM;
2657                 goto destroy_wq;
2658         }
2659
2660         nfc_set_parent_dev(priv->nfc_dev, parent);
2661         nfc_set_drvdata(priv->nfc_dev, priv);
2662
2663         rc = nfc_register_device(priv->nfc_dev);
2664         if (rc)
2665                 goto free_nfc_dev;
2666
2667         return priv;
2668
2669 free_nfc_dev:
2670         nfc_free_device(priv->nfc_dev);
2671
2672 destroy_wq:
2673         destroy_workqueue(priv->wq);
2674 error:
2675         kfree(priv);
2676         return ERR_PTR(rc);
2677 }
2678 EXPORT_SYMBOL_GPL(pn533_register_device);
2679
2680 void pn533_unregister_device(struct pn533 *priv)
2681 {
2682         struct pn533_cmd *cmd, *n;
2683
2684         nfc_unregister_device(priv->nfc_dev);
2685         nfc_free_device(priv->nfc_dev);
2686
2687         flush_delayed_work(&priv->poll_work);
2688         destroy_workqueue(priv->wq);
2689
2690         skb_queue_purge(&priv->resp_q);
2691
2692         del_timer(&priv->listen_timer);
2693
2694         list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2695                 list_del(&cmd->queue);
2696                 kfree(cmd);
2697         }
2698
2699         kfree(priv);
2700 }
2701 EXPORT_SYMBOL_GPL(pn533_unregister_device);
2702
2703
2704 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
2705 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
2706 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
2707 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2708 MODULE_VERSION(VERSION);
2709 MODULE_LICENSE("GPL");