drivers/nfc/pn533/pn533.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Driver for NXP PN533 NFC Chip - core functions
   4  *
   5  * Copyright (C) 2011 Instituto Nokia de Tecnologia
   6  * Copyright (C) 2012-2013 Tieto Poland
   7  */
   8
   9 #include <linux/device.h>
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/slab.h>
  13 #include <linux/nfc.h>
  14 #include <linux/netdevice.h>
  15 #include <net/nfc/nfc.h>
  16 #include "pn533.h"
  17
  18 #define VERSION "0.3"
  19
  20 /* How much time we spend listening for initiators */
  21 #define PN533_LISTEN_TIME 2
  22 /* Delay between each poll frame (ms) */
  23 #define PN533_POLL_INTERVAL 10
  24
  25 /* structs for pn533 commands */
  26
  27 /* PN533_CMD_GET_FIRMWARE_VERSION */
  28 struct pn533_fw_version {
  29         u8 ic;
  30         u8 ver;
  31         u8 rev;
  32         u8 support;
  33 };
  34
  35 /* PN533_CMD_RF_CONFIGURATION */
  36 #define PN533_CFGITEM_RF_FIELD    0x01
  37 #define PN533_CFGITEM_TIMING      0x02
  38 #define PN533_CFGITEM_MAX_RETRIES 0x05
  39 #define PN533_CFGITEM_PASORI      0x82
  40
  41 #define PN533_CFGITEM_RF_FIELD_AUTO_RFCA 0x2
  42 #define PN533_CFGITEM_RF_FIELD_ON        0x1
  43 #define PN533_CFGITEM_RF_FIELD_OFF       0x0
  44
  45 #define PN533_CONFIG_TIMING_102 0xb
  46 #define PN533_CONFIG_TIMING_204 0xc
  47 #define PN533_CONFIG_TIMING_409 0xd
  48 #define PN533_CONFIG_TIMING_819 0xe
  49
  50 #define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
  51 #define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF
  52
  53 struct pn533_config_max_retries {
  54         u8 mx_rty_atr;
  55         u8 mx_rty_psl;
  56         u8 mx_rty_passive_act;
  57 } __packed;
  58
  59 struct pn533_config_timing {
  60         u8 rfu;
  61         u8 atr_res_timeout;
  62         u8 dep_timeout;
  63 } __packed;
  64
  65 /* PN533_CMD_IN_LIST_PASSIVE_TARGET */
  66
  67 /* felica commands opcode */
  68 #define PN533_FELICA_OPC_SENSF_REQ 0
  69 #define PN533_FELICA_OPC_SENSF_RES 1
  70 /* felica SENSF_REQ parameters */
  71 #define PN533_FELICA_SENSF_SC_ALL 0xFFFF
  72 #define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
  73 #define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
  74 #define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2
  75
  76 /* type B initiator_data values */
  77 #define PN533_TYPE_B_AFI_ALL_FAMILIES 0
  78 #define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
  79 #define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1
  80
  81 union pn533_cmd_poll_initdata {
  82         struct {
  83                 u8 afi;
  84                 u8 polling_method;
  85         } __packed type_b;
  86         struct {
  87                 u8 opcode;
  88                 __be16 sc;
  89                 u8 rc;
  90                 u8 tsn;
  91         } __packed felica;
  92 };
  93
  94 struct pn533_poll_modulations {
  95         struct {
  96                 u8 maxtg;
  97                 u8 brty;
  98                 union pn533_cmd_poll_initdata initiator_data;
  99         } __packed data;
 100         u8 len;
 101 };
 102
 103 static const struct pn533_poll_modulations poll_mod[] = {
 104         [PN533_POLL_MOD_106KBPS_A] = {
 105                 .data = {
 106                         .maxtg = 1,
 107                         .brty = 0,
 108                 },
 109                 .len = 2,
 110         },
 111         [PN533_POLL_MOD_212KBPS_FELICA] = {
 112                 .data = {
 113                         .maxtg = 1,
 114                         .brty = 1,
 115                         .initiator_data.felica = {
 116                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
 117                                 .sc = PN533_FELICA_SENSF_SC_ALL,
 118                                 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
 119                                 .tsn = 0x03,
 120                         },
 121                 },
 122                 .len = 7,
 123         },
 124         [PN533_POLL_MOD_424KBPS_FELICA] = {
 125                 .data = {
 126                         .maxtg = 1,
 127                         .brty = 2,
 128                         .initiator_data.felica = {
 129                                 .opcode = PN533_FELICA_OPC_SENSF_REQ,
 130                                 .sc = PN533_FELICA_SENSF_SC_ALL,
 131                                 .rc = PN533_FELICA_SENSF_RC_SYSTEM_CODE,
 132                                 .tsn = 0x03,
 133                         },
 134                  },
 135                 .len = 7,
 136         },
 137         [PN533_POLL_MOD_106KBPS_JEWEL] = {
 138                 .data = {
 139                         .maxtg = 1,
 140                         .brty = 4,
 141                 },
 142                 .len = 2,
 143         },
 144         [PN533_POLL_MOD_847KBPS_B] = {
 145                 .data = {
 146                         .maxtg = 1,
 147                         .brty = 8,
 148                         .initiator_data.type_b = {
 149                                 .afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
 150                                 .polling_method =
 151                                         PN533_TYPE_B_POLL_METHOD_TIMESLOT,
 152                         },
 153                 },
 154                 .len = 3,
 155         },
 156         [PN533_LISTEN_MOD] = {
 157                 .len = 0,
 158         },
 159 };
 160
 161 /* PN533_CMD_IN_ATR */
 162
 163 struct pn533_cmd_activate_response {
 164         u8 status;
 165         u8 nfcid3t[10];
 166         u8 didt;
 167         u8 bst;
 168         u8 brt;
 169         u8 to;
 170         u8 ppt;
 171         /* optional */
 172         u8 gt[];
 173 } __packed;
 174
 175 struct pn533_cmd_jump_dep_response {
 176         u8 status;
 177         u8 tg;
 178         u8 nfcid3t[10];
 179         u8 didt;
 180         u8 bst;
 181         u8 brt;
 182         u8 to;
 183         u8 ppt;
 184         /* optional */
 185         u8 gt[];
 186 } __packed;
 187
 188 struct pn532_autopoll_resp {
 189         u8 type;
 190         u8 ln;
 191         u8 tg;
 192         u8 tgdata[];
 193 };
 194
 195 /* PN532_CMD_IN_AUTOPOLL */
 196 #define PN532_AUTOPOLL_POLLNR_INFINITE  0xff
 197 #define PN532_AUTOPOLL_PERIOD           0x03 /* in units of 150 ms */
 198
 199 #define PN532_AUTOPOLL_TYPE_GENERIC_106         0x00
 200 #define PN532_AUTOPOLL_TYPE_GENERIC_212         0x01
 201 #define PN532_AUTOPOLL_TYPE_GENERIC_424         0x02
 202 #define PN532_AUTOPOLL_TYPE_JEWEL               0x04
 203 #define PN532_AUTOPOLL_TYPE_MIFARE              0x10
 204 #define PN532_AUTOPOLL_TYPE_FELICA212           0x11
 205 #define PN532_AUTOPOLL_TYPE_FELICA424           0x12
 206 #define PN532_AUTOPOLL_TYPE_ISOA                0x20
 207 #define PN532_AUTOPOLL_TYPE_ISOB                0x23
 208 #define PN532_AUTOPOLL_TYPE_DEP_PASSIVE_106     0x40
 209 #define PN532_AUTOPOLL_TYPE_DEP_PASSIVE_212     0x41
 210 #define PN532_AUTOPOLL_TYPE_DEP_PASSIVE_424     0x42
 211 #define PN532_AUTOPOLL_TYPE_DEP_ACTIVE_106      0x80
 212 #define PN532_AUTOPOLL_TYPE_DEP_ACTIVE_212      0x81
 213 #define PN532_AUTOPOLL_TYPE_DEP_ACTIVE_424      0x82
 214
 215 /* PN533_TG_INIT_AS_TARGET */
 216 #define PN533_INIT_TARGET_PASSIVE 0x1
 217 #define PN533_INIT_TARGET_DEP 0x2
 218
 219 #define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
 220 #define PN533_INIT_TARGET_RESP_ACTIVE     0x1
 221 #define PN533_INIT_TARGET_RESP_DEP        0x4
 222
 223 /* The rule: value(high byte) + value(low byte) + checksum = 0 */
 224 static inline u8 pn533_ext_checksum(u16 value)
 225 {
 226         return ~(u8)(((value & 0xFF00) >> 8) + (u8)(value & 0xFF)) + 1;
 227 }
 228
 229 /* The rule: value + checksum = 0 */
 230 static inline u8 pn533_std_checksum(u8 value)
 231 {
 232         return ~value + 1;
 233 }
 234
 235 /* The rule: sum(data elements) + checksum = 0 */
 236 static u8 pn533_std_data_checksum(u8 *data, int datalen)
 237 {
 238         u8 sum = 0;
 239         int i;
 240
 241         for (i = 0; i < datalen; i++)
 242                 sum += data[i];
 243
 244         return pn533_std_checksum(sum);
 245 }
 246
 247 static void pn533_std_tx_frame_init(void *_frame, u8 cmd_code)
 248 {
 249         struct pn533_std_frame *frame = _frame;
 250
 251         frame->preamble = 0;
 252         frame->start_frame = cpu_to_be16(PN533_STD_FRAME_SOF);
 253         PN533_STD_FRAME_IDENTIFIER(frame) = PN533_STD_FRAME_DIR_OUT;
 254         PN533_FRAME_CMD(frame) = cmd_code;
 255         frame->datalen = 2;
 256 }
 257
 258 static void pn533_std_tx_frame_finish(void *_frame)
 259 {
 260         struct pn533_std_frame *frame = _frame;
 261
 262         frame->datalen_checksum = pn533_std_checksum(frame->datalen);
 263
 264         PN533_STD_FRAME_CHECKSUM(frame) =
 265                 pn533_std_data_checksum(frame->data, frame->datalen);
 266
 267         PN533_STD_FRAME_POSTAMBLE(frame) = 0;
 268 }
 269
 270 static void pn533_std_tx_update_payload_len(void *_frame, int len)
 271 {
 272         struct pn533_std_frame *frame = _frame;
 273
 274         frame->datalen += len;
 275 }
 276
 277 static bool pn533_std_rx_frame_is_valid(void *_frame, struct pn533 *dev)
 278 {
 279         u8 checksum;
 280         struct pn533_std_frame *stdf = _frame;
 281
 282         if (stdf->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
 283                 return false;
 284
 285         if (likely(!PN533_STD_IS_EXTENDED(stdf))) {
 286                 /* Standard frame code */
 287                 dev->ops->rx_header_len = PN533_STD_FRAME_HEADER_LEN;
 288
 289                 checksum = pn533_std_checksum(stdf->datalen);
 290                 if (checksum != stdf->datalen_checksum)
 291                         return false;
 292
 293                 checksum = pn533_std_data_checksum(stdf->data, stdf->datalen);
 294                 if (checksum != PN533_STD_FRAME_CHECKSUM(stdf))
 295                         return false;
 296         } else {
 297                 /* Extended */
 298                 struct pn533_ext_frame *eif = _frame;
 299
 300                 dev->ops->rx_header_len = PN533_EXT_FRAME_HEADER_LEN;
 301
 302                 checksum = pn533_ext_checksum(be16_to_cpu(eif->datalen));
 303                 if (checksum != eif->datalen_checksum)
 304                         return false;
 305
 306                 /* check data checksum */
 307                 checksum = pn533_std_data_checksum(eif->data,
 308                                                    be16_to_cpu(eif->datalen));
 309                 if (checksum != PN533_EXT_FRAME_CHECKSUM(eif))
 310                         return false;
 311         }
 312
 313         return true;
 314 }
 315
 316 bool pn533_rx_frame_is_ack(void *_frame)
 317 {
 318         struct pn533_std_frame *frame = _frame;
 319
 320         if (frame->start_frame != cpu_to_be16(PN533_STD_FRAME_SOF))
 321                 return false;
 322
 323         if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
 324                 return false;
 325
 326         return true;
 327 }
 328 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_ack);
 329
 330 static inline int pn533_std_rx_frame_size(void *frame)
 331 {
 332         struct pn533_std_frame *f = frame;
 333
 334         /* check for Extended Information frame */
 335         if (PN533_STD_IS_EXTENDED(f)) {
 336                 struct pn533_ext_frame *eif = frame;
 337
 338                 return sizeof(struct pn533_ext_frame)
 339                         + be16_to_cpu(eif->datalen) + PN533_STD_FRAME_TAIL_LEN;
 340         }
 341
 342         return sizeof(struct pn533_std_frame) + f->datalen +
 343                PN533_STD_FRAME_TAIL_LEN;
 344 }
 345
 346 static u8 pn533_std_get_cmd_code(void *frame)
 347 {
 348         struct pn533_std_frame *f = frame;
 349         struct pn533_ext_frame *eif = frame;
 350
 351         if (PN533_STD_IS_EXTENDED(f))
 352                 return PN533_FRAME_CMD(eif);
 353         else
 354                 return PN533_FRAME_CMD(f);
 355 }
 356
 357 bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
 358 {
 359         return (dev->ops->get_cmd_code(frame) ==
 360                                 PN533_CMD_RESPONSE(dev->cmd->code));
 361 }
 362 EXPORT_SYMBOL_GPL(pn533_rx_frame_is_cmd_response);
 363
 364
 365 static struct pn533_frame_ops pn533_std_frame_ops = {
 366         .tx_frame_init = pn533_std_tx_frame_init,
 367         .tx_frame_finish = pn533_std_tx_frame_finish,
 368         .tx_update_payload_len = pn533_std_tx_update_payload_len,
 369         .tx_header_len = PN533_STD_FRAME_HEADER_LEN,
 370         .tx_tail_len = PN533_STD_FRAME_TAIL_LEN,
 371
 372         .rx_is_frame_valid = pn533_std_rx_frame_is_valid,
 373         .rx_frame_size = pn533_std_rx_frame_size,
 374         .rx_header_len = PN533_STD_FRAME_HEADER_LEN,
 375         .rx_tail_len = PN533_STD_FRAME_TAIL_LEN,
 376
 377         .max_payload_len =  PN533_STD_FRAME_MAX_PAYLOAD_LEN,
 378         .get_cmd_code = pn533_std_get_cmd_code,
 379 };
 380
 381 static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
 382                                   struct sk_buff *skb)
 383 {
 384         /* payload is already there, just update datalen */
 385         int payload_len = skb->len;
 386         struct pn533_frame_ops *ops = dev->ops;
 387
 388
 389         skb_push(skb, ops->tx_header_len);
 390         skb_put(skb, ops->tx_tail_len);
 391
 392         ops->tx_frame_init(skb->data, cmd_code);
 393         ops->tx_update_payload_len(skb->data, payload_len);
 394         ops->tx_frame_finish(skb->data);
 395 }
 396
 397 static int pn533_send_async_complete(struct pn533 *dev)
 398 {
 399         struct pn533_cmd *cmd = dev->cmd;
 400         struct sk_buff *resp;
 401         int status, rc = 0;
 402
 403         if (!cmd) {
 404                 dev_dbg(dev->dev, "%s: cmd not set\n", __func__);
 405                 goto done;
 406         }
 407
 408         dev_kfree_skb(cmd->req);
 409
 410         status = cmd->status;
 411         resp = cmd->resp;
 412
 413         if (status < 0) {
 414                 rc = cmd->complete_cb(dev, cmd->complete_cb_context,
 415                                       ERR_PTR(status));
 416                 dev_kfree_skb(resp);
 417                 goto done;
 418         }
 419
 420         /* when no response is set we got interrupted */
 421         if (!resp)
 422                 resp = ERR_PTR(-EINTR);
 423
 424         if (!IS_ERR(resp)) {
 425                 skb_pull(resp, dev->ops->rx_header_len);
 426                 skb_trim(resp, resp->len - dev->ops->rx_tail_len);
 427         }
 428
 429         rc = cmd->complete_cb(dev, cmd->complete_cb_context, resp);
 430
 431 done:
 432         kfree(cmd);
 433         dev->cmd = NULL;
 434         return rc;
 435 }
 436
 437 static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
 438                               struct sk_buff *req,
 439                               pn533_send_async_complete_t complete_cb,
 440                               void *complete_cb_context)
 441 {
 442         struct pn533_cmd *cmd;
 443         int rc = 0;
 444
 445         dev_dbg(dev->dev, "Sending command 0x%x\n", cmd_code);
 446
 447         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 448         if (!cmd)
 449                 return -ENOMEM;
 450
 451         cmd->code = cmd_code;
 452         cmd->req = req;
 453         cmd->complete_cb = complete_cb;
 454         cmd->complete_cb_context = complete_cb_context;
 455
 456         pn533_build_cmd_frame(dev, cmd_code, req);
 457
 458         mutex_lock(&dev->cmd_lock);
 459
 460         if (!dev->cmd_pending) {
 461                 dev->cmd = cmd;
 462                 rc = dev->phy_ops->send_frame(dev, req);
 463                 if (rc) {
 464                         dev->cmd = NULL;
 465                         goto error;
 466                 }
 467
 468                 dev->cmd_pending = 1;
 469                 goto unlock;
 470         }
 471
 472         dev_dbg(dev->dev, "%s Queueing command 0x%x\n",
 473                 __func__, cmd_code);
 474
 475         INIT_LIST_HEAD(&cmd->queue);
 476         list_add_tail(&cmd->queue, &dev->cmd_queue);
 477
 478         goto unlock;
 479
 480 error:
 481         kfree(cmd);
 482 unlock:
 483         mutex_unlock(&dev->cmd_lock);
 484         return rc;
 485 }
 486
 487 static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
 488                                  struct sk_buff *req,
 489                                  pn533_send_async_complete_t complete_cb,
 490                                  void *complete_cb_context)
 491 {
 492         return __pn533_send_async(dev, cmd_code, req, complete_cb,
 493                                 complete_cb_context);
 494 }
 495
 496 static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
 497                                 struct sk_buff *req,
 498                                 pn533_send_async_complete_t complete_cb,
 499                                 void *complete_cb_context)
 500 {
 501         return __pn533_send_async(dev, cmd_code, req, complete_cb,
 502                                 complete_cb_context);
 503 }
 504
 505 /*
 506  * pn533_send_cmd_direct_async
 507  *
 508  * The function sends a priority cmd directly to the chip omitting the cmd
 509  * queue. It's intended to be used by chaining mechanism of received responses
 510  * where the host has to request every single chunk of data before scheduling
 511  * next cmd from the queue.
 512  */
 513 static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
 514                                        struct sk_buff *req,
 515                                        pn533_send_async_complete_t complete_cb,
 516                                        void *complete_cb_context)
 517 {
 518         struct pn533_cmd *cmd;
 519         int rc;
 520
 521         cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 522         if (!cmd)
 523                 return -ENOMEM;
 524
 525         cmd->code = cmd_code;
 526         cmd->req = req;
 527         cmd->complete_cb = complete_cb;
 528         cmd->complete_cb_context = complete_cb_context;
 529
 530         pn533_build_cmd_frame(dev, cmd_code, req);
 531
 532         dev->cmd = cmd;
 533         rc = dev->phy_ops->send_frame(dev, req);
 534         if (rc < 0) {
 535                 dev->cmd = NULL;
 536                 kfree(cmd);
 537         }
 538
 539         return rc;
 540 }
 541
 542 static void pn533_wq_cmd_complete(struct work_struct *work)
 543 {
 544         struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
 545         int rc;
 546
 547         rc = pn533_send_async_complete(dev);
 548         if (rc != -EINPROGRESS)
 549                 queue_work(dev->wq, &dev->cmd_work);
 550 }
 551
 552 static void pn533_wq_cmd(struct work_struct *work)
 553 {
 554         struct pn533 *dev = container_of(work, struct pn533, cmd_work);
 555         struct pn533_cmd *cmd;
 556         int rc;
 557
 558         mutex_lock(&dev->cmd_lock);
 559
 560         if (list_empty(&dev->cmd_queue)) {
 561                 dev->cmd_pending = 0;
 562                 mutex_unlock(&dev->cmd_lock);
 563                 return;
 564         }
 565
 566         cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);
 567
 568         list_del(&cmd->queue);
 569
 570         mutex_unlock(&dev->cmd_lock);
 571
 572         dev->cmd = cmd;
 573         rc = dev->phy_ops->send_frame(dev, cmd->req);
 574         if (rc < 0) {
 575                 dev->cmd = NULL;
 576                 dev_kfree_skb(cmd->req);
 577                 kfree(cmd);
 578                 return;
 579         }
 580
 581 }
 582
 583 struct pn533_sync_cmd_response {
 584         struct sk_buff *resp;
 585         struct completion done;
 586 };
 587
 588 static int pn533_send_sync_complete(struct pn533 *dev, void *_arg,
 589                                     struct sk_buff *resp)
 590 {
 591         struct pn533_sync_cmd_response *arg = _arg;
 592
 593         arg->resp = resp;
 594         complete(&arg->done);
 595
 596         return 0;
 597 }
 598
 599 /*  pn533_send_cmd_sync
 600  *
 601  *  Please note the req parameter is freed inside the function to
 602  *  limit a number of return value interpretations by the caller.
 603  *
 604  *  1. negative in case of error during TX path -> req should be freed
 605  *
 606  *  2. negative in case of error during RX path -> req should not be freed
 607  *     as it's been already freed at the beginning of RX path by
 608  *     async_complete_cb.
 609  *
 610  *  3. valid pointer in case of successful RX path
 611  *
 612  *  A caller has to check a return value with IS_ERR macro. If the test pass,
 613  *  the returned pointer is valid.
 614  *
 615  */
 616 static struct sk_buff *pn533_send_cmd_sync(struct pn533 *dev, u8 cmd_code,
 617                                                struct sk_buff *req)
 618 {
 619         int rc;
 620         struct pn533_sync_cmd_response arg;
 621
 622         init_completion(&arg.done);
 623
 624         rc = pn533_send_cmd_async(dev, cmd_code, req,
 625                                   pn533_send_sync_complete, &arg);
 626         if (rc) {
 627                 dev_kfree_skb(req);
 628                 return ERR_PTR(rc);
 629         }
 630
 631         wait_for_completion(&arg.done);
 632
 633         return arg.resp;
 634 }
 635
 636 static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
 637 {
 638         struct sk_buff *skb;
 639
 640         skb = alloc_skb(dev->ops->tx_header_len +
 641                         size +
 642                         dev->ops->tx_tail_len, GFP_KERNEL);
 643
 644         if (skb)
 645                 skb_reserve(skb, dev->ops->tx_header_len);
 646
 647         return skb;
 648 }
 649
 650 struct pn533_target_type_a {
 651         __be16 sens_res;
 652         u8 sel_res;
 653         u8 nfcid_len;
 654         u8 nfcid_data[];
 655 } __packed;
 656
 657
 658 #define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
 659 #define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
 660 #define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))
 661
 662 #define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
 663 #define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C
 664
 665 #define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
 666 #define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)
 667
 668 #define PN533_TYPE_A_SEL_PROT_MIFARE 0
 669 #define PN533_TYPE_A_SEL_PROT_ISO14443 1
 670 #define PN533_TYPE_A_SEL_PROT_DEP 2
 671 #define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3
 672
 673 static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
 674                                                         int target_data_len)
 675 {
 676         u8 ssd;
 677         u8 platconf;
 678
 679         if (target_data_len < sizeof(struct pn533_target_type_a))
 680                 return false;
 681
 682         /*
 683          * The length check of nfcid[] and ats[] are not being performed because
 684          * the values are not being used
 685          */
 686
 687         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
 688         ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
 689         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);
 690
 691         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 692              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
 693             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 694              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
 695                 return false;
 696
 697         /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
 698         if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
 699                 return false;
 700
 701         if (type_a->nfcid_len > NFC_NFCID1_MAXSIZE)
 702                 return false;
 703
 704         return true;
 705 }
 706
 707 static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
 708                                                         int tgt_data_len)
 709 {
 710         struct pn533_target_type_a *tgt_type_a;
 711
 712         tgt_type_a = (struct pn533_target_type_a *)tgt_data;
 713
 714         if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
 715                 return -EPROTO;
 716
 717         switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
 718         case PN533_TYPE_A_SEL_PROT_MIFARE:
 719                 nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
 720                 break;
 721         case PN533_TYPE_A_SEL_PROT_ISO14443:
 722                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
 723                 break;
 724         case PN533_TYPE_A_SEL_PROT_DEP:
 725                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 726                 break;
 727         case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
 728                 nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
 729                                                         NFC_PROTO_NFC_DEP_MASK;
 730                 break;
 731         }
 732
 733         nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
 734         nfc_tgt->sel_res = tgt_type_a->sel_res;
 735         nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
 736         memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);
 737
 738         return 0;
 739 }
 740
 741 struct pn533_target_felica {
 742         u8 pol_res;
 743         u8 opcode;
 744         u8 nfcid2[NFC_NFCID2_MAXSIZE];
 745         u8 pad[8];
 746         /* optional */
 747         u8 syst_code[];
 748 } __packed;
 749
 750 #define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
 751 #define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE
 752
 753 static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
 754                                                         int target_data_len)
 755 {
 756         if (target_data_len < sizeof(struct pn533_target_felica))
 757                 return false;
 758
 759         if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
 760                 return false;
 761
 762         return true;
 763 }
 764
 765 static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
 766                                                         int tgt_data_len)
 767 {
 768         struct pn533_target_felica *tgt_felica;
 769
 770         tgt_felica = (struct pn533_target_felica *)tgt_data;
 771
 772         if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
 773                 return -EPROTO;
 774
 775         if ((tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1) &&
 776             (tgt_felica->nfcid2[1] == PN533_FELICA_SENSF_NFCID2_DEP_B2))
 777                 nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
 778         else
 779                 nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;
 780
 781         memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
 782         nfc_tgt->sensf_res_len = 9;
 783
 784         memcpy(nfc_tgt->nfcid2, tgt_felica->nfcid2, NFC_NFCID2_MAXSIZE);
 785         nfc_tgt->nfcid2_len = NFC_NFCID2_MAXSIZE;
 786
 787         return 0;
 788 }
 789
 790 struct pn533_target_jewel {
 791         __be16 sens_res;
 792         u8 jewelid[4];
 793 } __packed;
 794
 795 static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
 796                                                         int target_data_len)
 797 {
 798         u8 ssd;
 799         u8 platconf;
 800
 801         if (target_data_len < sizeof(struct pn533_target_jewel))
 802                 return false;
 803
 804         /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
 805         ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
 806         platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);
 807
 808         if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 809              platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
 810             (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
 811              platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
 812                 return false;
 813
 814         return true;
 815 }
 816
 817 static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
 818                                                         int tgt_data_len)
 819 {
 820         struct pn533_target_jewel *tgt_jewel;
 821
 822         tgt_jewel = (struct pn533_target_jewel *)tgt_data;
 823
 824         if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
 825                 return -EPROTO;
 826
 827         nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
 828         nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
 829         nfc_tgt->nfcid1_len = 4;
 830         memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);
 831
 832         return 0;
 833 }
 834
 835 struct pn533_type_b_prot_info {
 836         u8 bitrate;
 837         u8 fsci_type;
 838         u8 fwi_adc_fo;
 839 } __packed;
 840
 841 #define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
 842 #define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
 843 #define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8
 844
 845 struct pn533_type_b_sens_res {
 846         u8 opcode;
 847         u8 nfcid[4];
 848         u8 appdata[4];
 849         struct pn533_type_b_prot_info prot_info;
 850 } __packed;
 851
 852 #define PN533_TYPE_B_OPC_SENSB_RES 0x50
 853
 854 struct pn533_target_type_b {
 855         struct pn533_type_b_sens_res sensb_res;
 856         u8 attrib_res_len;
 857         u8 attrib_res[];
 858 } __packed;
 859
 860 static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
 861                                                         int target_data_len)
 862 {
 863         if (target_data_len < sizeof(struct pn533_target_type_b))
 864                 return false;
 865
 866         if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
 867                 return false;
 868
 869         if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
 870                                                 PN533_TYPE_B_PROT_TYPE_RFU_MASK)
 871                 return false;
 872
 873         return true;
 874 }
 875
 876 static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
 877                                                         int tgt_data_len)
 878 {
 879         struct pn533_target_type_b *tgt_type_b;
 880
 881         tgt_type_b = (struct pn533_target_type_b *)tgt_data;
 882
 883         if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
 884                 return -EPROTO;
 885
 886         nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;
 887
 888         return 0;
 889 }
 890
 891 static void pn533_poll_reset_mod_list(struct pn533 *dev);
 892 static int pn533_target_found(struct pn533 *dev, u8 tg, u8 *tgdata,
 893                               int tgdata_len)
 894 {
 895         struct nfc_target nfc_tgt;
 896         int rc;
 897
 898         dev_dbg(dev->dev, "%s: modulation=%d\n",
 899                 __func__, dev->poll_mod_curr);
 900
 901         if (tg != 1)
 902                 return -EPROTO;
 903
 904         memset(&nfc_tgt, 0, sizeof(struct nfc_target));
 905
 906         switch (dev->poll_mod_curr) {
 907         case PN533_POLL_MOD_106KBPS_A:
 908                 rc = pn533_target_found_type_a(&nfc_tgt, tgdata, tgdata_len);
 909                 break;
 910         case PN533_POLL_MOD_212KBPS_FELICA:
 911         case PN533_POLL_MOD_424KBPS_FELICA:
 912                 rc = pn533_target_found_felica(&nfc_tgt, tgdata, tgdata_len);
 913                 break;
 914         case PN533_POLL_MOD_106KBPS_JEWEL:
 915                 rc = pn533_target_found_jewel(&nfc_tgt, tgdata, tgdata_len);
 916                 break;
 917         case PN533_POLL_MOD_847KBPS_B:
 918                 rc = pn533_target_found_type_b(&nfc_tgt, tgdata, tgdata_len);
 919                 break;
 920         default:
 921                 nfc_err(dev->dev,
 922                         "Unknown current poll modulation\n");
 923                 return -EPROTO;
 924         }
 925
 926         if (rc)
 927                 return rc;
 928
 929         if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
 930                 dev_dbg(dev->dev,
 931                         "The Tg found doesn't have the desired protocol\n");
 932                 return -EAGAIN;
 933         }
 934
 935         dev_dbg(dev->dev,
 936                 "Target found - supported protocols: 0x%x\n",
 937                 nfc_tgt.supported_protocols);
 938
 939         dev->tgt_available_prots = nfc_tgt.supported_protocols;
 940
 941         pn533_poll_reset_mod_list(dev);
 942         nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
 943
 944         return 0;
 945 }
 946
 947 static inline void pn533_poll_next_mod(struct pn533 *dev)
 948 {
 949         dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
 950 }
 951
 952 static void pn533_poll_reset_mod_list(struct pn533 *dev)
 953 {
 954         dev->poll_mod_count = 0;
 955 }
 956
 957 static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
 958 {
 959         dev->poll_mod_active[dev->poll_mod_count] =
 960                 (struct pn533_poll_modulations *)&poll_mod[mod_index];
 961         dev->poll_mod_count++;
 962 }
 963
 964 static void pn533_poll_create_mod_list(struct pn533 *dev,
 965                                        u32 im_protocols, u32 tm_protocols)
 966 {
 967         pn533_poll_reset_mod_list(dev);
 968
 969         if ((im_protocols & NFC_PROTO_MIFARE_MASK) ||
 970             (im_protocols & NFC_PROTO_ISO14443_MASK) ||
 971             (im_protocols & NFC_PROTO_NFC_DEP_MASK))
 972                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);
 973
 974         if (im_protocols & NFC_PROTO_FELICA_MASK ||
 975             im_protocols & NFC_PROTO_NFC_DEP_MASK) {
 976                 pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
 977                 pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
 978         }
 979
 980         if (im_protocols & NFC_PROTO_JEWEL_MASK)
 981                 pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);
 982
 983         if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
 984                 pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);
 985
 986         if (tm_protocols)
 987                 pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
 988 }
 989
 990 static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
 991 {
 992         u8 nbtg, tg, *tgdata;
 993         int rc, tgdata_len;
 994
 995         /* Toggle the DEP polling */
 996         if (dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK)
 997                 dev->poll_dep = 1;
 998
 999         nbtg = resp->data[0];
1000         tg = resp->data[1];
1001         tgdata = &resp->data[2];
1002         tgdata_len = resp->len - 2;  /* nbtg + tg */
1003
1004         if (nbtg) {
1005                 rc = pn533_target_found(dev, tg, tgdata, tgdata_len);
1006
1007                 /* We must stop the poll after a valid target found */
1008                 if (rc == 0)
1009                         return 0;
1010         }
1011
1012         return -EAGAIN;
1013 }
1014
1015 static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
1016 {
1017         struct sk_buff *skb;
1018         u8 *felica, *nfcid3;
1019
1020         u8 *gbytes = dev->gb;
1021         size_t gbytes_len = dev->gb_len;
1022
1023         u8 felica_params[18] = {0x1, 0xfe, /* DEP */
1024                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
1025                                 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
1026                                 0xff, 0xff}; /* System code */
1027
1028         u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
1029                                0x0, 0x0, 0x0,
1030                                0x40}; /* SEL_RES for DEP */
1031
1032         unsigned int skb_len = 36 + /*
1033                                      * mode (1), mifare (6),
1034                                      * felica (18), nfcid3 (10), gb_len (1)
1035                                      */
1036                                gbytes_len +
1037                                1;  /* len Tk*/
1038
1039         skb = pn533_alloc_skb(dev, skb_len);
1040         if (!skb)
1041                 return NULL;
1042
1043         /* DEP support only */
1044         skb_put_u8(skb, PN533_INIT_TARGET_DEP);
1045
1046         /* MIFARE params */
1047         skb_put_data(skb, mifare_params, 6);
1048
1049         /* Felica params */
1050         felica = skb_put_data(skb, felica_params, 18);
1051         get_random_bytes(felica + 2, 6);
1052
1053         /* NFCID3 */
1054         nfcid3 = skb_put_zero(skb, 10);
1055         memcpy(nfcid3, felica, 8);
1056
1057         /* General bytes */
1058         skb_put_u8(skb, gbytes_len);
1059
1060         skb_put_data(skb, gbytes, gbytes_len);
1061
1062         /* Len Tk */
1063         skb_put_u8(skb, 0);
1064
1065         return skb;
1066 }
1067
1068 static void pn533_wq_tm_mi_recv(struct work_struct *work);
1069 static struct sk_buff *pn533_build_response(struct pn533 *dev);
1070
1071 static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
1072                                       struct sk_buff *resp)
1073 {
1074         struct sk_buff *skb;
1075         u8 status, ret, mi;
1076         int rc;
1077
1078         dev_dbg(dev->dev, "%s\n", __func__);
1079
1080         if (IS_ERR(resp)) {
1081                 skb_queue_purge(&dev->resp_q);
1082                 return PTR_ERR(resp);
1083         }
1084
1085         status = resp->data[0];
1086
1087         ret = status & PN533_CMD_RET_MASK;
1088         mi = status & PN533_CMD_MI_MASK;
1089
1090         skb_pull(resp, sizeof(status));
1091
1092         if (ret != PN533_CMD_RET_SUCCESS) {
1093                 rc = -EIO;
1094                 goto error;
1095         }
1096
1097         skb_queue_tail(&dev->resp_q, resp);
1098
1099         if (mi) {
1100                 queue_work(dev->wq, &dev->mi_tm_rx_work);
1101                 return -EINPROGRESS;
1102         }
1103
1104         skb = pn533_build_response(dev);
1105         if (!skb) {
1106                 rc = -EIO;
1107                 goto error;
1108         }
1109
1110         return nfc_tm_data_received(dev->nfc_dev, skb);
1111
1112 error:
1113         nfc_tm_deactivated(dev->nfc_dev);
1114         dev->tgt_mode = 0;
1115         skb_queue_purge(&dev->resp_q);
1116         dev_kfree_skb(resp);
1117
1118         return rc;
1119 }
1120
1121 static void pn533_wq_tm_mi_recv(struct work_struct *work)
1122 {
1123         struct pn533 *dev = container_of(work, struct pn533, mi_tm_rx_work);
1124         struct sk_buff *skb;
1125         int rc;
1126
1127         dev_dbg(dev->dev, "%s\n", __func__);
1128
1129         skb = pn533_alloc_skb(dev, 0);
1130         if (!skb)
1131                 return;
1132
1133         rc = pn533_send_cmd_direct_async(dev,
1134                                         PN533_CMD_TG_GET_DATA,
1135                                         skb,
1136                                         pn533_tm_get_data_complete,
1137                                         NULL);
1138
1139         if (rc < 0)
1140                 dev_kfree_skb(skb);
1141 }
1142
1143 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
1144                                   struct sk_buff *resp);
1145 static void pn533_wq_tm_mi_send(struct work_struct *work)
1146 {
1147         struct pn533 *dev = container_of(work, struct pn533, mi_tm_tx_work);
1148         struct sk_buff *skb;
1149         int rc;
1150
1151         dev_dbg(dev->dev, "%s\n", __func__);
1152
1153         /* Grab the first skb in the queue */
1154         skb = skb_dequeue(&dev->fragment_skb);
1155         if (skb == NULL) {      /* No more data */
1156                 /* Reset the queue for future use */
1157                 skb_queue_head_init(&dev->fragment_skb);
1158                 goto error;
1159         }
1160
1161         /* last entry - remove MI bit */
1162         if (skb_queue_len(&dev->fragment_skb) == 0) {
1163                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_TG_SET_DATA,
1164                                         skb, pn533_tm_send_complete, NULL);
1165         } else
1166                 rc = pn533_send_cmd_direct_async(dev,
1167                                         PN533_CMD_TG_SET_META_DATA,
1168                                         skb, pn533_tm_send_complete, NULL);
1169
1170         if (rc == 0) /* success */
1171                 return;
1172
1173         dev_err(dev->dev,
1174                 "Error %d when trying to perform set meta data_exchange", rc);
1175
1176         dev_kfree_skb(skb);
1177
1178 error:
1179         dev->phy_ops->send_ack(dev, GFP_KERNEL);
1180         queue_work(dev->wq, &dev->cmd_work);
1181 }
1182
1183 static void pn533_wq_tg_get_data(struct work_struct *work)
1184 {
1185         struct pn533 *dev = container_of(work, struct pn533, tg_work);
1186         struct sk_buff *skb;
1187         int rc;
1188
1189         dev_dbg(dev->dev, "%s\n", __func__);
1190
1191         skb = pn533_alloc_skb(dev, 0);
1192         if (!skb)
1193                 return;
1194
1195         rc = pn533_send_data_async(dev, PN533_CMD_TG_GET_DATA, skb,
1196                                    pn533_tm_get_data_complete, NULL);
1197
1198         if (rc < 0)
1199                 dev_kfree_skb(skb);
1200 }
1201
1202 #define ATR_REQ_GB_OFFSET 17
1203 static int pn533_init_target_complete(struct pn533 *dev, struct sk_buff *resp)
1204 {
1205         u8 mode, *cmd, comm_mode = NFC_COMM_PASSIVE, *gb;
1206         size_t gb_len;
1207         int rc;
1208
1209         dev_dbg(dev->dev, "%s\n", __func__);
1210
1211         if (resp->len < ATR_REQ_GB_OFFSET + 1)
1212                 return -EINVAL;
1213
1214         mode = resp->data[0];
1215         cmd = &resp->data[1];
1216
1217         dev_dbg(dev->dev, "Target mode 0x%x len %d\n",
1218                 mode, resp->len);
1219
1220         if ((mode & PN533_INIT_TARGET_RESP_FRAME_MASK) ==
1221             PN533_INIT_TARGET_RESP_ACTIVE)
1222                 comm_mode = NFC_COMM_ACTIVE;
1223
1224         if ((mode & PN533_INIT_TARGET_RESP_DEP) == 0)  /* Only DEP supported */
1225                 return -EOPNOTSUPP;
1226
1227         gb = cmd + ATR_REQ_GB_OFFSET;
1228         gb_len = resp->len - (ATR_REQ_GB_OFFSET + 1);
1229
1230         rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
1231                               comm_mode, gb, gb_len);
1232         if (rc < 0) {
1233                 nfc_err(dev->dev,
1234                         "Error when signaling target activation\n");
1235                 return rc;
1236         }
1237
1238         dev->tgt_mode = 1;
1239         queue_work(dev->wq, &dev->tg_work);
1240
1241         return 0;
1242 }
1243
1244 static void pn533_listen_mode_timer(struct timer_list *t)
1245 {
1246         struct pn533 *dev = from_timer(dev, t, listen_timer);
1247
1248         dev_dbg(dev->dev, "Listen mode timeout\n");
1249
1250         dev->cancel_listen = 1;
1251
1252         pn533_poll_next_mod(dev);
1253
1254         queue_delayed_work(dev->wq, &dev->poll_work,
1255                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1256 }
1257
1258 static int pn533_rf_complete(struct pn533 *dev, void *arg,
1259                              struct sk_buff *resp)
1260 {
1261         int rc = 0;
1262
1263         dev_dbg(dev->dev, "%s\n", __func__);
1264
1265         if (IS_ERR(resp)) {
1266                 rc = PTR_ERR(resp);
1267
1268                 nfc_err(dev->dev, "RF setting error %d\n", rc);
1269
1270                 return rc;
1271         }
1272
1273         queue_delayed_work(dev->wq, &dev->poll_work,
1274                            msecs_to_jiffies(PN533_POLL_INTERVAL));
1275
1276         dev_kfree_skb(resp);
1277         return rc;
1278 }
1279
1280 static void pn533_wq_rf(struct work_struct *work)
1281 {
1282         struct pn533 *dev = container_of(work, struct pn533, rf_work);
1283         struct sk_buff *skb;
1284         int rc;
1285
1286         dev_dbg(dev->dev, "%s\n", __func__);
1287
1288         skb = pn533_alloc_skb(dev, 2);
1289         if (!skb)
1290                 return;
1291
1292         skb_put_u8(skb, PN533_CFGITEM_RF_FIELD);
1293         skb_put_u8(skb, PN533_CFGITEM_RF_FIELD_AUTO_RFCA);
1294
1295         rc = pn533_send_cmd_async(dev, PN533_CMD_RF_CONFIGURATION, skb,
1296                                   pn533_rf_complete, NULL);
1297         if (rc < 0) {
1298                 dev_kfree_skb(skb);
1299                 nfc_err(dev->dev, "RF setting error %d\n", rc);
1300         }
1301 }
1302
1303 static int pn533_poll_dep_complete(struct pn533 *dev, void *arg,
1304                                    struct sk_buff *resp)
1305 {
1306         struct pn533_cmd_jump_dep_response *rsp;
1307         struct nfc_target nfc_target;
1308         u8 target_gt_len;
1309         int rc;
1310
1311         if (IS_ERR(resp))
1312                 return PTR_ERR(resp);
1313
1314         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1315
1316         rc = rsp->status & PN533_CMD_RET_MASK;
1317         if (rc != PN533_CMD_RET_SUCCESS) {
1318                 /* Not target found, turn radio off */
1319                 queue_work(dev->wq, &dev->rf_work);
1320
1321                 dev_kfree_skb(resp);
1322                 return 0;
1323         }
1324
1325         dev_dbg(dev->dev, "Creating new target");
1326
1327         nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1328         nfc_target.nfcid1_len = 10;
1329         memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1330         rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1331         if (rc)
1332                 goto error;
1333
1334         dev->tgt_available_prots = 0;
1335         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1336
1337         /* ATR_RES general bytes are located at offset 17 */
1338         target_gt_len = resp->len - 17;
1339         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1340                                           rsp->gt, target_gt_len);
1341         if (!rc) {
1342                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1343                                         dev->nfc_dev->targets[0].idx,
1344                                         0, NFC_RF_INITIATOR);
1345
1346                 if (!rc)
1347                         pn533_poll_reset_mod_list(dev);
1348         }
1349 error:
1350         dev_kfree_skb(resp);
1351         return rc;
1352 }
1353
1354 #define PASSIVE_DATA_LEN 5
1355 static int pn533_poll_dep(struct nfc_dev *nfc_dev)
1356 {
1357         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1358         struct sk_buff *skb;
1359         int rc, skb_len;
1360         u8 *next, nfcid3[NFC_NFCID3_MAXSIZE];
1361         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1362
1363         dev_dbg(dev->dev, "%s", __func__);
1364
1365         if (!dev->gb) {
1366                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1367
1368                 if (!dev->gb || !dev->gb_len) {
1369                         dev->poll_dep = 0;
1370                         queue_work(dev->wq, &dev->rf_work);
1371                 }
1372         }
1373
1374         skb_len = 3 + dev->gb_len; /* ActPass + BR + Next */
1375         skb_len += PASSIVE_DATA_LEN;
1376
1377         /* NFCID3 */
1378         skb_len += NFC_NFCID3_MAXSIZE;
1379         nfcid3[0] = 0x1;
1380         nfcid3[1] = 0xfe;
1381         get_random_bytes(nfcid3 + 2, 6);
1382
1383         skb = pn533_alloc_skb(dev, skb_len);
1384         if (!skb)
1385                 return -ENOMEM;
1386
1387         skb_put_u8(skb, 0x01);  /* Active */
1388         skb_put_u8(skb, 0x02);  /* 424 kbps */
1389
1390         next = skb_put(skb, 1);  /* Next */
1391         *next = 0;
1392
1393         /* Copy passive data */
1394         skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
1395         *next |= 1;
1396
1397         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
1398         skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
1399         *next |= 2;
1400
1401         skb_put_data(skb, dev->gb, dev->gb_len);
1402         *next |= 4; /* We have some Gi */
1403
1404         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
1405                                   pn533_poll_dep_complete, NULL);
1406
1407         if (rc < 0)
1408                 dev_kfree_skb(skb);
1409
1410         return rc;
1411 }
1412
1413 static int pn533_autopoll_complete(struct pn533 *dev, void *arg,
1414                                struct sk_buff *resp)
1415 {
1416         struct pn532_autopoll_resp *apr;
1417         struct nfc_target nfc_tgt;
1418         u8 nbtg;
1419         int rc;
1420
1421         if (IS_ERR(resp)) {
1422                 rc = PTR_ERR(resp);
1423
1424                 nfc_err(dev->dev, "%s  autopoll complete error %d\n",
1425                         __func__, rc);
1426
1427                 if (rc == -ENOENT) {
1428                         if (dev->poll_mod_count != 0)
1429                                 return rc;
1430                         goto stop_poll;
1431                 } else if (rc < 0) {
1432                         nfc_err(dev->dev,
1433                                 "Error %d when running autopoll\n", rc);
1434                         goto stop_poll;
1435                 }
1436         }
1437
1438         nbtg = resp->data[0];
1439         if ((nbtg > 2) || (nbtg <= 0))
1440                 return -EAGAIN;
1441
1442         apr = (struct pn532_autopoll_resp *)&resp->data[1];
1443         while (nbtg--) {
1444                 memset(&nfc_tgt, 0, sizeof(struct nfc_target));
1445                 switch (apr->type) {
1446                 case PN532_AUTOPOLL_TYPE_ISOA:
1447                         dev_dbg(dev->dev, "ISOA\n");
1448                         rc = pn533_target_found_type_a(&nfc_tgt, apr->tgdata,
1449                                                        apr->ln - 1);
1450                         break;
1451                 case PN532_AUTOPOLL_TYPE_FELICA212:
1452                 case PN532_AUTOPOLL_TYPE_FELICA424:
1453                         dev_dbg(dev->dev, "FELICA\n");
1454                         rc = pn533_target_found_felica(&nfc_tgt, apr->tgdata,
1455                                                        apr->ln - 1);
1456                         break;
1457                 case PN532_AUTOPOLL_TYPE_JEWEL:
1458                         dev_dbg(dev->dev, "JEWEL\n");
1459                         rc = pn533_target_found_jewel(&nfc_tgt, apr->tgdata,
1460                                                       apr->ln - 1);
1461                         break;
1462                 case PN532_AUTOPOLL_TYPE_ISOB:
1463                         dev_dbg(dev->dev, "ISOB\n");
1464                         rc = pn533_target_found_type_b(&nfc_tgt, apr->tgdata,
1465                                                        apr->ln - 1);
1466                         break;
1467                 case PN532_AUTOPOLL_TYPE_MIFARE:
1468                         dev_dbg(dev->dev, "Mifare\n");
1469                         rc = pn533_target_found_type_a(&nfc_tgt, apr->tgdata,
1470                                                        apr->ln - 1);
1471                         break;
1472                 default:
1473                         nfc_err(dev->dev,
1474                                     "Unknown current poll modulation\n");
1475                         rc = -EPROTO;
1476                 }
1477
1478                 if (rc)
1479                         goto done;
1480
1481                 if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
1482                         nfc_err(dev->dev,
1483                                     "The Tg found doesn't have the desired protocol\n");
1484                         rc = -EAGAIN;
1485                         goto done;
1486                 }
1487
1488                 dev->tgt_available_prots = nfc_tgt.supported_protocols;
1489                 apr = (struct pn532_autopoll_resp *)
1490                         (apr->tgdata + (apr->ln - 1));
1491         }
1492
1493         pn533_poll_reset_mod_list(dev);
1494         nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
1495
1496 done:
1497         dev_kfree_skb(resp);
1498         return rc;
1499
1500 stop_poll:
1501         nfc_err(dev->dev, "autopoll operation has been stopped\n");
1502
1503         pn533_poll_reset_mod_list(dev);
1504         dev->poll_protocols = 0;
1505         return rc;
1506 }
1507
1508 static int pn533_poll_complete(struct pn533 *dev, void *arg,
1509                                struct sk_buff *resp)
1510 {
1511         struct pn533_poll_modulations *cur_mod;
1512         int rc;
1513
1514         dev_dbg(dev->dev, "%s\n", __func__);
1515
1516         if (IS_ERR(resp)) {
1517                 rc = PTR_ERR(resp);
1518
1519                 nfc_err(dev->dev, "%s  Poll complete error %d\n",
1520                         __func__, rc);
1521
1522                 if (rc == -ENOENT) {
1523                         if (dev->poll_mod_count != 0)
1524                                 return rc;
1525                         goto stop_poll;
1526                 } else if (rc < 0) {
1527                         nfc_err(dev->dev,
1528                                 "Error %d when running poll\n", rc);
1529                         goto stop_poll;
1530                 }
1531         }
1532
1533         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1534
1535         if (cur_mod->len == 0) { /* Target mode */
1536                 del_timer(&dev->listen_timer);
1537                 rc = pn533_init_target_complete(dev, resp);
1538                 goto done;
1539         }
1540
1541         /* Initiator mode */
1542         rc = pn533_start_poll_complete(dev, resp);
1543         if (!rc)
1544                 goto done;
1545
1546         if (!dev->poll_mod_count) {
1547                 dev_dbg(dev->dev, "Polling has been stopped\n");
1548                 goto done;
1549         }
1550
1551         pn533_poll_next_mod(dev);
1552         /* Not target found, turn radio off */
1553         queue_work(dev->wq, &dev->rf_work);
1554
1555 done:
1556         dev_kfree_skb(resp);
1557         return rc;
1558
1559 stop_poll:
1560         nfc_err(dev->dev, "Polling operation has been stopped\n");
1561
1562         pn533_poll_reset_mod_list(dev);
1563         dev->poll_protocols = 0;
1564         return rc;
1565 }
1566
1567 static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
1568                                         struct pn533_poll_modulations *mod)
1569 {
1570         struct sk_buff *skb;
1571
1572         skb = pn533_alloc_skb(dev, mod->len);
1573         if (!skb)
1574                 return NULL;
1575
1576         skb_put_data(skb, &mod->data, mod->len);
1577
1578         return skb;
1579 }
1580
1581 static int pn533_send_poll_frame(struct pn533 *dev)
1582 {
1583         struct pn533_poll_modulations *mod;
1584         struct sk_buff *skb;
1585         int rc;
1586         u8 cmd_code;
1587
1588         mod = dev->poll_mod_active[dev->poll_mod_curr];
1589
1590         dev_dbg(dev->dev, "%s mod len %d\n",
1591                 __func__, mod->len);
1592
1593         if ((dev->poll_protocols & NFC_PROTO_NFC_DEP_MASK) && dev->poll_dep)  {
1594                 dev->poll_dep = 0;
1595                 return pn533_poll_dep(dev->nfc_dev);
1596         }
1597
1598         if (mod->len == 0) {  /* Listen mode */
1599                 cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
1600                 skb = pn533_alloc_poll_tg_frame(dev);
1601         } else {  /* Polling mode */
1602                 cmd_code =  PN533_CMD_IN_LIST_PASSIVE_TARGET;
1603                 skb = pn533_alloc_poll_in_frame(dev, mod);
1604         }
1605
1606         if (!skb) {
1607                 nfc_err(dev->dev, "Failed to allocate skb\n");
1608                 return -ENOMEM;
1609         }
1610
1611         rc = pn533_send_cmd_async(dev, cmd_code, skb, pn533_poll_complete,
1612                                   NULL);
1613         if (rc < 0) {
1614                 dev_kfree_skb(skb);
1615                 nfc_err(dev->dev, "Polling loop error %d\n", rc);
1616         }
1617
1618         return rc;
1619 }
1620
1621 static void pn533_wq_poll(struct work_struct *work)
1622 {
1623         struct pn533 *dev = container_of(work, struct pn533, poll_work.work);
1624         struct pn533_poll_modulations *cur_mod;
1625         int rc;
1626
1627         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1628
1629         dev_dbg(dev->dev,
1630                 "%s cancel_listen %d modulation len %d\n",
1631                 __func__, dev->cancel_listen, cur_mod->len);
1632
1633         if (dev->cancel_listen == 1) {
1634                 dev->cancel_listen = 0;
1635                 dev->phy_ops->abort_cmd(dev, GFP_ATOMIC);
1636         }
1637
1638         rc = pn533_send_poll_frame(dev);
1639         if (rc)
1640                 return;
1641
1642         if (cur_mod->len == 0 && dev->poll_mod_count > 1)
1643                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1644 }
1645
1646 static int pn533_start_poll(struct nfc_dev *nfc_dev,
1647                             u32 im_protocols, u32 tm_protocols)
1648 {
1649         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1650         struct pn533_poll_modulations *cur_mod;
1651         struct sk_buff *skb;
1652         u8 rand_mod;
1653         int rc;
1654
1655         dev_dbg(dev->dev,
1656                 "%s: im protocols 0x%x tm protocols 0x%x\n",
1657                 __func__, im_protocols, tm_protocols);
1658
1659         if (dev->tgt_active_prot) {
1660                 nfc_err(dev->dev,
1661                         "Cannot poll with a target already activated\n");
1662                 return -EBUSY;
1663         }
1664
1665         if (dev->tgt_mode) {
1666                 nfc_err(dev->dev,
1667                         "Cannot poll while already being activated\n");
1668                 return -EBUSY;
1669         }
1670
1671         if (tm_protocols) {
1672                 dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
1673                 if (dev->gb == NULL)
1674                         tm_protocols = 0;
1675         }
1676
1677         dev->poll_protocols = im_protocols;
1678         dev->listen_protocols = tm_protocols;
1679         if (dev->device_type == PN533_DEVICE_PN532_AUTOPOLL) {
1680                 skb = pn533_alloc_skb(dev, 4 + 6);
1681                 if (!skb)
1682                         return -ENOMEM;
1683
1684                 *((u8 *)skb_put(skb, sizeof(u8))) =
1685                         PN532_AUTOPOLL_POLLNR_INFINITE;
1686                 *((u8 *)skb_put(skb, sizeof(u8))) = PN532_AUTOPOLL_PERIOD;
1687
1688                 if ((im_protocols & NFC_PROTO_MIFARE_MASK) &&
1689                                 (im_protocols & NFC_PROTO_ISO14443_MASK) &&
1690                                 (im_protocols & NFC_PROTO_NFC_DEP_MASK))
1691                         *((u8 *)skb_put(skb, sizeof(u8))) =
1692                                 PN532_AUTOPOLL_TYPE_GENERIC_106;
1693                 else {
1694                         if (im_protocols & NFC_PROTO_MIFARE_MASK)
1695                                 *((u8 *)skb_put(skb, sizeof(u8))) =
1696                                         PN532_AUTOPOLL_TYPE_MIFARE;
1697
1698                         if (im_protocols & NFC_PROTO_ISO14443_MASK)
1699                                 *((u8 *)skb_put(skb, sizeof(u8))) =
1700                                         PN532_AUTOPOLL_TYPE_ISOA;
1701
1702                         if (im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1703                                 *((u8 *)skb_put(skb, sizeof(u8))) =
1704                                         PN532_AUTOPOLL_TYPE_DEP_PASSIVE_106;
1705                                 *((u8 *)skb_put(skb, sizeof(u8))) =
1706                                         PN532_AUTOPOLL_TYPE_DEP_PASSIVE_212;
1707                                 *((u8 *)skb_put(skb, sizeof(u8))) =
1708                                         PN532_AUTOPOLL_TYPE_DEP_PASSIVE_424;
1709                         }
1710                 }
1711
1712                 if (im_protocols & NFC_PROTO_FELICA_MASK ||
1713                                 im_protocols & NFC_PROTO_NFC_DEP_MASK) {
1714                         *((u8 *)skb_put(skb, sizeof(u8))) =
1715                                 PN532_AUTOPOLL_TYPE_FELICA212;
1716                         *((u8 *)skb_put(skb, sizeof(u8))) =
1717                                 PN532_AUTOPOLL_TYPE_FELICA424;
1718                 }
1719
1720                 if (im_protocols & NFC_PROTO_JEWEL_MASK)
1721                         *((u8 *)skb_put(skb, sizeof(u8))) =
1722                                 PN532_AUTOPOLL_TYPE_JEWEL;
1723
1724                 if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
1725                         *((u8 *)skb_put(skb, sizeof(u8))) =
1726                                 PN532_AUTOPOLL_TYPE_ISOB;
1727
1728                 if (tm_protocols)
1729                         *((u8 *)skb_put(skb, sizeof(u8))) =
1730                                 PN532_AUTOPOLL_TYPE_DEP_ACTIVE_106;
1731
1732                 rc = pn533_send_cmd_async(dev, PN533_CMD_IN_AUTOPOLL, skb,
1733                                 pn533_autopoll_complete, NULL);
1734
1735                 if (rc < 0)
1736                         dev_kfree_skb(skb);
1737                 else
1738                         dev->poll_mod_count++;
1739
1740                 return rc;
1741         }
1742
1743         pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
1744
1745         /* Do not always start polling from the same modulation */
1746         get_random_bytes(&rand_mod, sizeof(rand_mod));
1747         rand_mod %= dev->poll_mod_count;
1748         dev->poll_mod_curr = rand_mod;
1749
1750         cur_mod = dev->poll_mod_active[dev->poll_mod_curr];
1751
1752         rc = pn533_send_poll_frame(dev);
1753
1754         /* Start listen timer */
1755         if (!rc && cur_mod->len == 0 && dev->poll_mod_count > 1)
1756                 mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);
1757
1758         return rc;
1759 }
1760
1761 static void pn533_stop_poll(struct nfc_dev *nfc_dev)
1762 {
1763         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1764
1765         del_timer(&dev->listen_timer);
1766
1767         if (!dev->poll_mod_count) {
1768                 dev_dbg(dev->dev,
1769                         "Polling operation was not running\n");
1770                 return;
1771         }
1772
1773         dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
1774         flush_delayed_work(&dev->poll_work);
1775         pn533_poll_reset_mod_list(dev);
1776 }
1777
1778 static int pn533_activate_target_nfcdep(struct pn533 *dev)
1779 {
1780         struct pn533_cmd_activate_response *rsp;
1781         u16 gt_len;
1782         int rc;
1783         struct sk_buff *skb;
1784         struct sk_buff *resp;
1785
1786         dev_dbg(dev->dev, "%s\n", __func__);
1787
1788         skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
1789         if (!skb)
1790                 return -ENOMEM;
1791
1792         skb_put_u8(skb, 1); /* TG */
1793         skb_put_u8(skb, 0); /* Next */
1794
1795         resp = pn533_send_cmd_sync(dev, PN533_CMD_IN_ATR, skb);
1796         if (IS_ERR(resp))
1797                 return PTR_ERR(resp);
1798
1799         rsp = (struct pn533_cmd_activate_response *)resp->data;
1800         rc = rsp->status & PN533_CMD_RET_MASK;
1801         if (rc != PN533_CMD_RET_SUCCESS) {
1802                 nfc_err(dev->dev,
1803                         "Target activation failed (error 0x%x)\n", rc);
1804                 dev_kfree_skb(resp);
1805                 return -EIO;
1806         }
1807
1808         /* ATR_RES general bytes are located at offset 16 */
1809         gt_len = resp->len - 16;
1810         rc = nfc_set_remote_general_bytes(dev->nfc_dev, rsp->gt, gt_len);
1811
1812         dev_kfree_skb(resp);
1813         return rc;
1814 }
1815
1816 static int pn533_activate_target(struct nfc_dev *nfc_dev,
1817                                  struct nfc_target *target, u32 protocol)
1818 {
1819         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1820         int rc;
1821
1822         dev_dbg(dev->dev, "%s: protocol=%u\n", __func__, protocol);
1823
1824         if (dev->poll_mod_count) {
1825                 nfc_err(dev->dev,
1826                         "Cannot activate while polling\n");
1827                 return -EBUSY;
1828         }
1829
1830         if (dev->tgt_active_prot) {
1831                 nfc_err(dev->dev,
1832                         "There is already an active target\n");
1833                 return -EBUSY;
1834         }
1835
1836         if (!dev->tgt_available_prots) {
1837                 nfc_err(dev->dev,
1838                         "There is no available target to activate\n");
1839                 return -EINVAL;
1840         }
1841
1842         if (!(dev->tgt_available_prots & (1 << protocol))) {
1843                 nfc_err(dev->dev,
1844                         "Target doesn't support requested proto %u\n",
1845                         protocol);
1846                 return -EINVAL;
1847         }
1848
1849         if (protocol == NFC_PROTO_NFC_DEP) {
1850                 rc = pn533_activate_target_nfcdep(dev);
1851                 if (rc) {
1852                         nfc_err(dev->dev,
1853                                 "Activating target with DEP failed %d\n", rc);
1854                         return rc;
1855                 }
1856         }
1857
1858         dev->tgt_active_prot = protocol;
1859         dev->tgt_available_prots = 0;
1860
1861         return 0;
1862 }
1863
1864 static int pn533_deactivate_target_complete(struct pn533 *dev, void *arg,
1865                              struct sk_buff *resp)
1866 {
1867         int rc = 0;
1868
1869         dev_dbg(dev->dev, "%s\n", __func__);
1870
1871         if (IS_ERR(resp)) {
1872                 rc = PTR_ERR(resp);
1873
1874                 nfc_err(dev->dev, "Target release error %d\n", rc);
1875
1876                 return rc;
1877         }
1878
1879         rc = resp->data[0] & PN533_CMD_RET_MASK;
1880         if (rc != PN533_CMD_RET_SUCCESS)
1881                 nfc_err(dev->dev,
1882                         "Error 0x%x when releasing the target\n", rc);
1883
1884         dev_kfree_skb(resp);
1885         return rc;
1886 }
1887
1888 static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
1889                                     struct nfc_target *target, u8 mode)
1890 {
1891         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1892         struct sk_buff *skb;
1893         int rc;
1894
1895         dev_dbg(dev->dev, "%s\n", __func__);
1896
1897         if (!dev->tgt_active_prot) {
1898                 nfc_err(dev->dev, "There is no active target\n");
1899                 return;
1900         }
1901
1902         dev->tgt_active_prot = 0;
1903         skb_queue_purge(&dev->resp_q);
1904
1905         skb = pn533_alloc_skb(dev, sizeof(u8));
1906         if (!skb)
1907                 return;
1908
1909         skb_put_u8(skb, 1); /* TG*/
1910
1911         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_RELEASE, skb,
1912                                   pn533_deactivate_target_complete, NULL);
1913         if (rc < 0) {
1914                 dev_kfree_skb(skb);
1915                 nfc_err(dev->dev, "Target release error %d\n", rc);
1916         }
1917 }
1918
1919
1920 static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
1921                                          struct sk_buff *resp)
1922 {
1923         struct pn533_cmd_jump_dep_response *rsp;
1924         u8 target_gt_len;
1925         int rc;
1926         u8 active = *(u8 *)arg;
1927
1928         kfree(arg);
1929
1930         if (IS_ERR(resp))
1931                 return PTR_ERR(resp);
1932
1933         if (dev->tgt_available_prots &&
1934             !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
1935                 nfc_err(dev->dev,
1936                         "The target does not support DEP\n");
1937                 rc =  -EINVAL;
1938                 goto error;
1939         }
1940
1941         rsp = (struct pn533_cmd_jump_dep_response *)resp->data;
1942
1943         rc = rsp->status & PN533_CMD_RET_MASK;
1944         if (rc != PN533_CMD_RET_SUCCESS) {
1945                 nfc_err(dev->dev,
1946                         "Bringing DEP link up failed (error 0x%x)\n", rc);
1947                 goto error;
1948         }
1949
1950         if (!dev->tgt_available_prots) {
1951                 struct nfc_target nfc_target;
1952
1953                 dev_dbg(dev->dev, "Creating new target\n");
1954
1955                 nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
1956                 nfc_target.nfcid1_len = 10;
1957                 memcpy(nfc_target.nfcid1, rsp->nfcid3t, nfc_target.nfcid1_len);
1958                 rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
1959                 if (rc)
1960                         goto error;
1961
1962                 dev->tgt_available_prots = 0;
1963         }
1964
1965         dev->tgt_active_prot = NFC_PROTO_NFC_DEP;
1966
1967         /* ATR_RES general bytes are located at offset 17 */
1968         target_gt_len = resp->len - 17;
1969         rc = nfc_set_remote_general_bytes(dev->nfc_dev,
1970                                           rsp->gt, target_gt_len);
1971         if (rc == 0)
1972                 rc = nfc_dep_link_is_up(dev->nfc_dev,
1973                                         dev->nfc_dev->targets[0].idx,
1974                                         !active, NFC_RF_INITIATOR);
1975
1976 error:
1977         dev_kfree_skb(resp);
1978         return rc;
1979 }
1980
1981 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf);
1982 static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
1983                              u8 comm_mode, u8 *gb, size_t gb_len)
1984 {
1985         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
1986         struct sk_buff *skb;
1987         int rc, skb_len;
1988         u8 *next, *arg, nfcid3[NFC_NFCID3_MAXSIZE];
1989         u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
1990
1991         dev_dbg(dev->dev, "%s\n", __func__);
1992
1993         if (dev->poll_mod_count) {
1994                 nfc_err(dev->dev,
1995                         "Cannot bring the DEP link up while polling\n");
1996                 return -EBUSY;
1997         }
1998
1999         if (dev->tgt_active_prot) {
2000                 nfc_err(dev->dev,
2001                         "There is already an active target\n");
2002                 return -EBUSY;
2003         }
2004
2005         skb_len = 3 + gb_len; /* ActPass + BR + Next */
2006         skb_len += PASSIVE_DATA_LEN;
2007
2008         /* NFCID3 */
2009         skb_len += NFC_NFCID3_MAXSIZE;
2010         if (target && !target->nfcid2_len) {
2011                 nfcid3[0] = 0x1;
2012                 nfcid3[1] = 0xfe;
2013                 get_random_bytes(nfcid3 + 2, 6);
2014         }
2015
2016         skb = pn533_alloc_skb(dev, skb_len);
2017         if (!skb)
2018                 return -ENOMEM;
2019
2020         skb_put_u8(skb, !comm_mode);  /* ActPass */
2021         skb_put_u8(skb, 0x02);  /* 424 kbps */
2022
2023         next = skb_put(skb, 1);  /* Next */
2024         *next = 0;
2025
2026         /* Copy passive data */
2027         skb_put_data(skb, passive_data, PASSIVE_DATA_LEN);
2028         *next |= 1;
2029
2030         /* Copy NFCID3 (which is NFCID2 from SENSF_RES) */
2031         if (target && target->nfcid2_len)
2032                 memcpy(skb_put(skb, NFC_NFCID3_MAXSIZE), target->nfcid2,
2033                        target->nfcid2_len);
2034         else
2035                 skb_put_data(skb, nfcid3, NFC_NFCID3_MAXSIZE);
2036         *next |= 2;
2037
2038         if (gb != NULL && gb_len > 0) {
2039                 skb_put_data(skb, gb, gb_len);
2040                 *next |= 4; /* We have some Gi */
2041         } else {
2042                 *next = 0;
2043         }
2044
2045         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2046         if (!arg) {
2047                 dev_kfree_skb(skb);
2048                 return -ENOMEM;
2049         }
2050
2051         *arg = !comm_mode;
2052
2053         pn533_rf_field(dev->nfc_dev, 0);
2054
2055         rc = pn533_send_cmd_async(dev, PN533_CMD_IN_JUMP_FOR_DEP, skb,
2056                                   pn533_in_dep_link_up_complete, arg);
2057
2058         if (rc < 0) {
2059                 dev_kfree_skb(skb);
2060                 kfree(arg);
2061         }
2062
2063         return rc;
2064 }
2065
2066 static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
2067 {
2068         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2069
2070         dev_dbg(dev->dev, "%s\n", __func__);
2071
2072         pn533_poll_reset_mod_list(dev);
2073
2074         if (dev->tgt_mode || dev->tgt_active_prot)
2075                 dev->phy_ops->abort_cmd(dev, GFP_KERNEL);
2076
2077         dev->tgt_active_prot = 0;
2078         dev->tgt_mode = 0;
2079
2080         skb_queue_purge(&dev->resp_q);
2081
2082         return 0;
2083 }
2084
2085 struct pn533_data_exchange_arg {
2086         data_exchange_cb_t cb;
2087         void *cb_context;
2088 };
2089
2090 static struct sk_buff *pn533_build_response(struct pn533 *dev)
2091 {
2092         struct sk_buff *skb, *tmp, *t;
2093         unsigned int skb_len = 0, tmp_len = 0;
2094
2095         dev_dbg(dev->dev, "%s\n", __func__);
2096
2097         if (skb_queue_empty(&dev->resp_q))
2098                 return NULL;
2099
2100         if (skb_queue_len(&dev->resp_q) == 1) {
2101                 skb = skb_dequeue(&dev->resp_q);
2102                 goto out;
2103         }
2104
2105         skb_queue_walk_safe(&dev->resp_q, tmp, t)
2106                 skb_len += tmp->len;
2107
2108         dev_dbg(dev->dev, "%s total length %d\n",
2109                 __func__, skb_len);
2110
2111         skb = alloc_skb(skb_len, GFP_KERNEL);
2112         if (skb == NULL)
2113                 goto out;
2114
2115         skb_put(skb, skb_len);
2116
2117         skb_queue_walk_safe(&dev->resp_q, tmp, t) {
2118                 memcpy(skb->data + tmp_len, tmp->data, tmp->len);
2119                 tmp_len += tmp->len;
2120         }
2121
2122 out:
2123         skb_queue_purge(&dev->resp_q);
2124
2125         return skb;
2126 }
2127
2128 static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
2129                                         struct sk_buff *resp)
2130 {
2131         struct pn533_data_exchange_arg *arg = _arg;
2132         struct sk_buff *skb;
2133         int rc = 0;
2134         u8 status, ret, mi;
2135
2136         dev_dbg(dev->dev, "%s\n", __func__);
2137
2138         if (IS_ERR(resp)) {
2139                 rc = PTR_ERR(resp);
2140                 goto _error;
2141         }
2142
2143         status = resp->data[0];
2144         ret = status & PN533_CMD_RET_MASK;
2145         mi = status & PN533_CMD_MI_MASK;
2146
2147         skb_pull(resp, sizeof(status));
2148
2149         if (ret != PN533_CMD_RET_SUCCESS) {
2150                 nfc_err(dev->dev,
2151                         "Exchanging data failed (error 0x%x)\n", ret);
2152                 rc = -EIO;
2153                 goto error;
2154         }
2155
2156         skb_queue_tail(&dev->resp_q, resp);
2157
2158         if (mi) {
2159                 dev->cmd_complete_mi_arg = arg;
2160                 queue_work(dev->wq, &dev->mi_rx_work);
2161                 return -EINPROGRESS;
2162         }
2163
2164         /* Prepare for the next round */
2165         if (skb_queue_len(&dev->fragment_skb) > 0) {
2166                 dev->cmd_complete_dep_arg = arg;
2167                 queue_work(dev->wq, &dev->mi_tx_work);
2168
2169                 return -EINPROGRESS;
2170         }
2171
2172         skb = pn533_build_response(dev);
2173         if (!skb) {
2174                 rc = -ENOMEM;
2175                 goto error;
2176         }
2177
2178         arg->cb(arg->cb_context, skb, 0);
2179         kfree(arg);
2180         return 0;
2181
2182 error:
2183         dev_kfree_skb(resp);
2184 _error:
2185         skb_queue_purge(&dev->resp_q);
2186         arg->cb(arg->cb_context, NULL, rc);
2187         kfree(arg);
2188         return rc;
2189 }
2190
2191 /*
2192  * Receive an incoming pn533 frame. skb contains only header and payload.
2193  * If skb == NULL, it is a notification that the link below is dead.
2194  */
2195 void pn533_recv_frame(struct pn533 *dev, struct sk_buff *skb, int status)
2196 {
2197         if (!dev->cmd)
2198                 goto sched_wq;
2199
2200         dev->cmd->status = status;
2201
2202         if (status != 0) {
2203                 dev_dbg(dev->dev, "%s: Error received: %d\n", __func__, status);
2204                 goto sched_wq;
2205         }
2206
2207         if (skb == NULL) {
2208                 pr_err("NULL Frame -> link is dead\n");
2209                 goto sched_wq;
2210         }
2211
2212         if (pn533_rx_frame_is_ack(skb->data)) {
2213                 dev_dbg(dev->dev, "%s: Received ACK frame\n", __func__);
2214                 dev_kfree_skb(skb);
2215                 return;
2216         }
2217
2218         print_hex_dump_debug("PN533 RX: ", DUMP_PREFIX_NONE, 16, 1, skb->data,
2219                              dev->ops->rx_frame_size(skb->data), false);
2220
2221         if (!dev->ops->rx_is_frame_valid(skb->data, dev)) {
2222                 nfc_err(dev->dev, "Received an invalid frame\n");
2223                 dev->cmd->status = -EIO;
2224         } else if (!pn533_rx_frame_is_cmd_response(dev, skb->data)) {
2225                 nfc_err(dev->dev, "It it not the response to the last command\n");
2226                 dev->cmd->status = -EIO;
2227         }
2228
2229         dev->cmd->resp = skb;
2230
2231 sched_wq:
2232         queue_work(dev->wq, &dev->cmd_complete_work);
2233 }
2234 EXPORT_SYMBOL(pn533_recv_frame);
2235
2236 /* Split the Tx skb into small chunks */
2237 static int pn533_fill_fragment_skbs(struct pn533 *dev, struct sk_buff *skb)
2238 {
2239         struct sk_buff *frag;
2240         int  frag_size;
2241
2242         do {
2243                 /* Remaining size */
2244                 if (skb->len > PN533_CMD_DATAFRAME_MAXLEN)
2245                         frag_size = PN533_CMD_DATAFRAME_MAXLEN;
2246                 else
2247                         frag_size = skb->len;
2248
2249                 /* Allocate and reserve */
2250                 frag = pn533_alloc_skb(dev, frag_size);
2251                 if (!frag) {
2252                         skb_queue_purge(&dev->fragment_skb);
2253                         break;
2254                 }
2255
2256                 if (!dev->tgt_mode) {
2257                         /* Reserve the TG/MI byte */
2258                         skb_reserve(frag, 1);
2259
2260                         /* MI + TG */
2261                         if (frag_size  == PN533_CMD_DATAFRAME_MAXLEN)
2262                                 *(u8 *)skb_push(frag, sizeof(u8)) =
2263                                                 (PN533_CMD_MI_MASK | 1);
2264                         else
2265                                 *(u8 *)skb_push(frag, sizeof(u8)) =  1; /* TG */
2266                 }
2267
2268                 skb_put_data(frag, skb->data, frag_size);
2269
2270                 /* Reduce the size of incoming buffer */
2271                 skb_pull(skb, frag_size);
2272
2273                 /* Add this to skb_queue */
2274                 skb_queue_tail(&dev->fragment_skb, frag);
2275
2276         } while (skb->len > 0);
2277
2278         dev_kfree_skb(skb);
2279
2280         return skb_queue_len(&dev->fragment_skb);
2281 }
2282
2283 static int pn533_transceive(struct nfc_dev *nfc_dev,
2284                             struct nfc_target *target, struct sk_buff *skb,
2285                             data_exchange_cb_t cb, void *cb_context)
2286 {
2287         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2288         struct pn533_data_exchange_arg *arg = NULL;
2289         int rc;
2290
2291         dev_dbg(dev->dev, "%s\n", __func__);
2292
2293         if (!dev->tgt_active_prot) {
2294                 nfc_err(dev->dev,
2295                         "Can't exchange data if there is no active target\n");
2296                 rc = -EINVAL;
2297                 goto error;
2298         }
2299
2300         arg = kmalloc(sizeof(*arg), GFP_KERNEL);
2301         if (!arg) {
2302                 rc = -ENOMEM;
2303                 goto error;
2304         }
2305
2306         arg->cb = cb;
2307         arg->cb_context = cb_context;
2308
2309         switch (dev->device_type) {
2310         case PN533_DEVICE_PASORI:
2311                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2312                         rc = pn533_send_data_async(dev, PN533_CMD_IN_COMM_THRU,
2313                                                    skb,
2314                                                    pn533_data_exchange_complete,
2315                                                    arg);
2316
2317                         break;
2318                 }
2319                 fallthrough;
2320         default:
2321                 /* jumbo frame ? */
2322                 if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2323                         rc = pn533_fill_fragment_skbs(dev, skb);
2324                         if (rc <= 0)
2325                                 goto error;
2326
2327                         skb = skb_dequeue(&dev->fragment_skb);
2328                         if (!skb) {
2329                                 rc = -EIO;
2330                                 goto error;
2331                         }
2332                 } else {
2333                         *(u8 *)skb_push(skb, sizeof(u8)) =  1; /* TG */
2334                 }
2335
2336                 rc = pn533_send_data_async(dev, PN533_CMD_IN_DATA_EXCHANGE,
2337                                            skb, pn533_data_exchange_complete,
2338                                            arg);
2339
2340                 break;
2341         }
2342
2343         if (rc < 0) /* rc from send_async */
2344                 goto error;
2345
2346         return 0;
2347
2348 error:
2349         kfree(arg);
2350         dev_kfree_skb(skb);
2351         return rc;
2352 }
2353
2354 static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
2355                                   struct sk_buff *resp)
2356 {
2357         u8 status;
2358
2359         dev_dbg(dev->dev, "%s\n", __func__);
2360
2361         if (IS_ERR(resp))
2362                 return PTR_ERR(resp);
2363
2364         status = resp->data[0];
2365
2366         /* Prepare for the next round */
2367         if (skb_queue_len(&dev->fragment_skb) > 0) {
2368                 queue_work(dev->wq, &dev->mi_tm_tx_work);
2369                 return -EINPROGRESS;
2370         }
2371         dev_kfree_skb(resp);
2372
2373         if (status != 0) {
2374                 nfc_tm_deactivated(dev->nfc_dev);
2375
2376                 dev->tgt_mode = 0;
2377
2378                 return 0;
2379         }
2380
2381         queue_work(dev->wq, &dev->tg_work);
2382
2383         return 0;
2384 }
2385
2386 static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
2387 {
2388         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2389         int rc;
2390
2391         dev_dbg(dev->dev, "%s\n", __func__);
2392
2393         /* let's split in multiple chunks if size's too big */
2394         if (skb->len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
2395                 rc = pn533_fill_fragment_skbs(dev, skb);
2396                 if (rc <= 0)
2397                         goto error;
2398
2399                 /* get the first skb */
2400                 skb = skb_dequeue(&dev->fragment_skb);
2401                 if (!skb) {
2402                         rc = -EIO;
2403                         goto error;
2404                 }
2405
2406                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_META_DATA, skb,
2407                                                 pn533_tm_send_complete, NULL);
2408         } else {
2409                 /* Send th skb */
2410                 rc = pn533_send_data_async(dev, PN533_CMD_TG_SET_DATA, skb,
2411                                                 pn533_tm_send_complete, NULL);
2412         }
2413
2414 error:
2415         if (rc < 0) {
2416                 dev_kfree_skb(skb);
2417                 skb_queue_purge(&dev->fragment_skb);
2418         }
2419
2420         return rc;
2421 }
2422
2423 static void pn533_wq_mi_recv(struct work_struct *work)
2424 {
2425         struct pn533 *dev = container_of(work, struct pn533, mi_rx_work);
2426         struct sk_buff *skb;
2427         int rc;
2428
2429         dev_dbg(dev->dev, "%s\n", __func__);
2430
2431         skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
2432         if (!skb)
2433                 goto error;
2434
2435         switch (dev->device_type) {
2436         case PN533_DEVICE_PASORI:
2437                 if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
2438                         rc = pn533_send_cmd_direct_async(dev,
2439                                                 PN533_CMD_IN_COMM_THRU,
2440                                                 skb,
2441                                                 pn533_data_exchange_complete,
2442                                                  dev->cmd_complete_mi_arg);
2443
2444                         break;
2445                 }
2446                 fallthrough;
2447         default:
2448                 skb_put_u8(skb, 1); /*TG*/
2449
2450                 rc = pn533_send_cmd_direct_async(dev,
2451                                                  PN533_CMD_IN_DATA_EXCHANGE,
2452                                                  skb,
2453                                                  pn533_data_exchange_complete,
2454                                                  dev->cmd_complete_mi_arg);
2455
2456                 break;
2457         }
2458
2459         if (rc == 0) /* success */
2460                 return;
2461
2462         nfc_err(dev->dev,
2463                 "Error %d when trying to perform data_exchange\n", rc);
2464
2465         dev_kfree_skb(skb);
2466         kfree(dev->cmd_complete_mi_arg);
2467
2468 error:
2469         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2470         queue_work(dev->wq, &dev->cmd_work);
2471 }
2472
2473 static void pn533_wq_mi_send(struct work_struct *work)
2474 {
2475         struct pn533 *dev = container_of(work, struct pn533, mi_tx_work);
2476         struct sk_buff *skb;
2477         int rc;
2478
2479         dev_dbg(dev->dev, "%s\n", __func__);
2480
2481         /* Grab the first skb in the queue */
2482         skb = skb_dequeue(&dev->fragment_skb);
2483
2484         if (skb == NULL) {      /* No more data */
2485                 /* Reset the queue for future use */
2486                 skb_queue_head_init(&dev->fragment_skb);
2487                 goto error;
2488         }
2489
2490         switch (dev->device_type) {
2491         case PN533_DEVICE_PASORI:
2492                 if (dev->tgt_active_prot != NFC_PROTO_FELICA) {
2493                         rc = -EIO;
2494                         break;
2495                 }
2496
2497                 rc = pn533_send_cmd_direct_async(dev, PN533_CMD_IN_COMM_THRU,
2498                                                  skb,
2499                                                  pn533_data_exchange_complete,
2500                                                  dev->cmd_complete_dep_arg);
2501
2502                 break;
2503
2504         default:
2505                 /* Still some fragments? */
2506                 rc = pn533_send_cmd_direct_async(dev,
2507                                                  PN533_CMD_IN_DATA_EXCHANGE,
2508                                                  skb,
2509                                                  pn533_data_exchange_complete,
2510                                                  dev->cmd_complete_dep_arg);
2511
2512                 break;
2513         }
2514
2515         if (rc == 0) /* success */
2516                 return;
2517
2518         nfc_err(dev->dev,
2519                 "Error %d when trying to perform data_exchange\n", rc);
2520
2521         dev_kfree_skb(skb);
2522         kfree(dev->cmd_complete_dep_arg);
2523
2524 error:
2525         dev->phy_ops->send_ack(dev, GFP_KERNEL);
2526         queue_work(dev->wq, &dev->cmd_work);
2527 }
2528
2529 static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
2530                                                                 u8 cfgdata_len)
2531 {
2532         struct sk_buff *skb;
2533         struct sk_buff *resp;
2534         int skb_len;
2535
2536         dev_dbg(dev->dev, "%s\n", __func__);
2537
2538         skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
2539
2540         skb = pn533_alloc_skb(dev, skb_len);
2541         if (!skb)
2542                 return -ENOMEM;
2543
2544         skb_put_u8(skb, cfgitem);
2545         skb_put_data(skb, cfgdata, cfgdata_len);
2546
2547         resp = pn533_send_cmd_sync(dev, PN533_CMD_RF_CONFIGURATION, skb);
2548         if (IS_ERR(resp))
2549                 return PTR_ERR(resp);
2550
2551         dev_kfree_skb(resp);
2552         return 0;
2553 }
2554
2555 static int pn533_get_firmware_version(struct pn533 *dev,
2556                                       struct pn533_fw_version *fv)
2557 {
2558         struct sk_buff *skb;
2559         struct sk_buff *resp;
2560
2561         skb = pn533_alloc_skb(dev, 0);
2562         if (!skb)
2563                 return -ENOMEM;
2564
2565         resp = pn533_send_cmd_sync(dev, PN533_CMD_GET_FIRMWARE_VERSION, skb);
2566         if (IS_ERR(resp))
2567                 return PTR_ERR(resp);
2568
2569         fv->ic = resp->data[0];
2570         fv->ver = resp->data[1];
2571         fv->rev = resp->data[2];
2572         fv->support = resp->data[3];
2573
2574         dev_kfree_skb(resp);
2575         return 0;
2576 }
2577
2578 static int pn533_pasori_fw_reset(struct pn533 *dev)
2579 {
2580         struct sk_buff *skb;
2581         struct sk_buff *resp;
2582
2583         dev_dbg(dev->dev, "%s\n", __func__);
2584
2585         skb = pn533_alloc_skb(dev, sizeof(u8));
2586         if (!skb)
2587                 return -ENOMEM;
2588
2589         skb_put_u8(skb, 0x1);
2590
2591         resp = pn533_send_cmd_sync(dev, 0x18, skb);
2592         if (IS_ERR(resp))
2593                 return PTR_ERR(resp);
2594
2595         dev_kfree_skb(resp);
2596
2597         return 0;
2598 }
2599
2600 static int pn533_rf_field(struct nfc_dev *nfc_dev, u8 rf)
2601 {
2602         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2603         u8 rf_field = !!rf;
2604         int rc;
2605
2606         rf_field |= PN533_CFGITEM_RF_FIELD_AUTO_RFCA;
2607
2608         rc = pn533_set_configuration(dev, PN533_CFGITEM_RF_FIELD,
2609                                      (u8 *)&rf_field, 1);
2610         if (rc) {
2611                 nfc_err(dev->dev, "Error on setting RF field\n");
2612                 return rc;
2613         }
2614
2615         return 0;
2616 }
2617
2618 static int pn532_sam_configuration(struct nfc_dev *nfc_dev)
2619 {
2620         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2621         struct sk_buff *skb;
2622         struct sk_buff *resp;
2623
2624         skb = pn533_alloc_skb(dev, 1);
2625         if (!skb)
2626                 return -ENOMEM;
2627
2628         skb_put_u8(skb, 0x01);
2629
2630         resp = pn533_send_cmd_sync(dev, PN533_CMD_SAM_CONFIGURATION, skb);
2631         if (IS_ERR(resp))
2632                 return PTR_ERR(resp);
2633
2634         dev_kfree_skb(resp);
2635         return 0;
2636 }
2637
2638 static int pn533_dev_up(struct nfc_dev *nfc_dev)
2639 {
2640         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2641         int rc;
2642
2643         if (dev->phy_ops->dev_up) {
2644                 rc = dev->phy_ops->dev_up(dev);
2645                 if (rc)
2646                         return rc;
2647         }
2648
2649         if ((dev->device_type == PN533_DEVICE_PN532) ||
2650                 (dev->device_type == PN533_DEVICE_PN532_AUTOPOLL)) {
2651                 rc = pn532_sam_configuration(nfc_dev);
2652
2653                 if (rc)
2654                         return rc;
2655         }
2656
2657         return pn533_rf_field(nfc_dev, 1);
2658 }
2659
2660 static int pn533_dev_down(struct nfc_dev *nfc_dev)
2661 {
2662         struct pn533 *dev = nfc_get_drvdata(nfc_dev);
2663         int ret;
2664
2665         ret = pn533_rf_field(nfc_dev, 0);
2666         if (dev->phy_ops->dev_down && !ret)
2667                 ret = dev->phy_ops->dev_down(dev);
2668
2669         return ret;
2670 }
2671
2672 static struct nfc_ops pn533_nfc_ops = {
2673         .dev_up = pn533_dev_up,
2674         .dev_down = pn533_dev_down,
2675         .dep_link_up = pn533_dep_link_up,
2676         .dep_link_down = pn533_dep_link_down,
2677         .start_poll = pn533_start_poll,
2678         .stop_poll = pn533_stop_poll,
2679         .activate_target = pn533_activate_target,
2680         .deactivate_target = pn533_deactivate_target,
2681         .im_transceive = pn533_transceive,
2682         .tm_send = pn533_tm_send,
2683 };
2684
2685 static int pn533_setup(struct pn533 *dev)
2686 {
2687         struct pn533_config_max_retries max_retries;
2688         struct pn533_config_timing timing;
2689         u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
2690         int rc;
2691
2692         switch (dev->device_type) {
2693         case PN533_DEVICE_STD:
2694         case PN533_DEVICE_PASORI:
2695         case PN533_DEVICE_ACR122U:
2696         case PN533_DEVICE_PN532:
2697         case PN533_DEVICE_PN532_AUTOPOLL:
2698                 max_retries.mx_rty_atr = 0x2;
2699                 max_retries.mx_rty_psl = 0x1;
2700                 max_retries.mx_rty_passive_act =
2701                         PN533_CONFIG_MAX_RETRIES_NO_RETRY;
2702
2703                 timing.rfu = PN533_CONFIG_TIMING_102;
2704                 timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
2705                 timing.dep_timeout = PN533_CONFIG_TIMING_204;
2706
2707                 break;
2708
2709         default:
2710                 nfc_err(dev->dev, "Unknown device type %d\n",
2711                         dev->device_type);
2712                 return -EINVAL;
2713         }
2714
2715         rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
2716                                      (u8 *)&max_retries, sizeof(max_retries));
2717         if (rc) {
2718                 nfc_err(dev->dev,
2719                         "Error on setting MAX_RETRIES config\n");
2720                 return rc;
2721         }
2722
2723
2724         rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
2725                                      (u8 *)&timing, sizeof(timing));
2726         if (rc) {
2727                 nfc_err(dev->dev, "Error on setting RF timings\n");
2728                 return rc;
2729         }
2730
2731         switch (dev->device_type) {
2732         case PN533_DEVICE_STD:
2733         case PN533_DEVICE_PN532:
2734         case PN533_DEVICE_PN532_AUTOPOLL:
2735                 break;
2736
2737         case PN533_DEVICE_PASORI:
2738                 pn533_pasori_fw_reset(dev);
2739
2740                 rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
2741                                              pasori_cfg, 3);
2742                 if (rc) {
2743                         nfc_err(dev->dev,
2744                                 "Error while settings PASORI config\n");
2745                         return rc;
2746                 }
2747
2748                 pn533_pasori_fw_reset(dev);
2749
2750                 break;
2751         }
2752
2753         return 0;
2754 }
2755
2756 int pn533_finalize_setup(struct pn533 *dev)
2757 {
2758
2759         struct pn533_fw_version fw_ver;
2760         int rc;
2761
2762         memset(&fw_ver, 0, sizeof(fw_ver));
2763
2764         rc = pn533_get_firmware_version(dev, &fw_ver);
2765         if (rc) {
2766                 nfc_err(dev->dev, "Unable to get FW version\n");
2767                 return rc;
2768         }
2769
2770         nfc_info(dev->dev, "NXP PN5%02X firmware ver %d.%d now attached\n",
2771                 fw_ver.ic, fw_ver.ver, fw_ver.rev);
2772
2773         rc = pn533_setup(dev);
2774         if (rc)
2775                 return rc;
2776
2777         return 0;
2778 }
2779 EXPORT_SYMBOL_GPL(pn533_finalize_setup);
2780
2781 struct pn533 *pn53x_common_init(u32 device_type,
2782                                 enum pn533_protocol_type protocol_type,
2783                                 void *phy,
2784                                 struct pn533_phy_ops *phy_ops,
2785                                 struct pn533_frame_ops *fops,
2786                                 struct device *dev)
2787 {
2788         struct pn533 *priv;
2789
2790         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2791         if (!priv)
2792                 return ERR_PTR(-ENOMEM);
2793
2794         priv->phy = phy;
2795         priv->phy_ops = phy_ops;
2796         priv->dev = dev;
2797         if (fops != NULL)
2798                 priv->ops = fops;
2799         else
2800                 priv->ops = &pn533_std_frame_ops;
2801
2802         priv->protocol_type = protocol_type;
2803         priv->device_type = device_type;
2804
2805         mutex_init(&priv->cmd_lock);
2806
2807         INIT_WORK(&priv->cmd_work, pn533_wq_cmd);
2808         INIT_WORK(&priv->cmd_complete_work, pn533_wq_cmd_complete);
2809         INIT_WORK(&priv->mi_rx_work, pn533_wq_mi_recv);
2810         INIT_WORK(&priv->mi_tx_work, pn533_wq_mi_send);
2811         INIT_WORK(&priv->tg_work, pn533_wq_tg_get_data);
2812         INIT_WORK(&priv->mi_tm_rx_work, pn533_wq_tm_mi_recv);
2813         INIT_WORK(&priv->mi_tm_tx_work, pn533_wq_tm_mi_send);
2814         INIT_DELAYED_WORK(&priv->poll_work, pn533_wq_poll);
2815         INIT_WORK(&priv->rf_work, pn533_wq_rf);
2816         priv->wq = alloc_ordered_workqueue("pn533", 0);
2817         if (priv->wq == NULL)
2818                 goto error;
2819
2820         timer_setup(&priv->listen_timer, pn533_listen_mode_timer, 0);
2821
2822         skb_queue_head_init(&priv->resp_q);
2823         skb_queue_head_init(&priv->fragment_skb);
2824
2825         INIT_LIST_HEAD(&priv->cmd_queue);
2826         return priv;
2827
2828 error:
2829         kfree(priv);
2830         return ERR_PTR(-ENOMEM);
2831 }
2832 EXPORT_SYMBOL_GPL(pn53x_common_init);
2833
2834 void pn53x_common_clean(struct pn533 *priv)
2835 {
2836         struct pn533_cmd *cmd, *n;
2837
2838         flush_delayed_work(&priv->poll_work);
2839         destroy_workqueue(priv->wq);
2840
2841         skb_queue_purge(&priv->resp_q);
2842
2843         del_timer(&priv->listen_timer);
2844
2845         list_for_each_entry_safe(cmd, n, &priv->cmd_queue, queue) {
2846                 list_del(&cmd->queue);
2847                 kfree(cmd);
2848         }
2849
2850         kfree(priv);
2851 }
2852 EXPORT_SYMBOL_GPL(pn53x_common_clean);
2853
2854 int pn532_i2c_nfc_alloc(struct pn533 *priv, u32 protocols,
2855                         struct device *parent)
2856 {
2857         priv->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
2858                                            priv->ops->tx_header_len +
2859                                            PN533_CMD_DATAEXCH_HEAD_LEN,
2860                                            priv->ops->tx_tail_len);
2861         if (!priv->nfc_dev)
2862                 return -ENOMEM;
2863
2864         nfc_set_parent_dev(priv->nfc_dev, parent);
2865         nfc_set_drvdata(priv->nfc_dev, priv);
2866         return 0;
2867 }
2868 EXPORT_SYMBOL_GPL(pn532_i2c_nfc_alloc);
2869
2870 int pn53x_register_nfc(struct pn533 *priv, u32 protocols,
2871                         struct device *parent)
2872 {
2873         int rc;
2874
2875         rc = pn532_i2c_nfc_alloc(priv, protocols, parent);
2876         if (rc)
2877                 return rc;
2878
2879         rc = nfc_register_device(priv->nfc_dev);
2880         if (rc)
2881                 nfc_free_device(priv->nfc_dev);
2882
2883         return rc;
2884 }
2885 EXPORT_SYMBOL_GPL(pn53x_register_nfc);
2886
2887 void pn53x_unregister_nfc(struct pn533 *priv)
2888 {
2889         nfc_unregister_device(priv->nfc_dev);
2890         nfc_free_device(priv->nfc_dev);
2891 }
2892 EXPORT_SYMBOL_GPL(pn53x_unregister_nfc);
2893
2894 MODULE_AUTHOR("Lauro Ramos Venancio <[email protected]>");
2895 MODULE_AUTHOR("Aloisio Almeida Jr <[email protected]>");
2896 MODULE_AUTHOR("Waldemar Rymarkiewicz <[email protected]>");
2897 MODULE_DESCRIPTION("PN533 driver ver " VERSION);
2898 MODULE_VERSION(VERSION);
2899 MODULE_LICENSE("GPL");