drivers/nfc/pn533/usb.c

   1 /*
   2  * Driver for NXP PN533 NFC Chip - USB transport layer
   3  *
   4  * Copyright (C) 2011 Instituto Nokia de Tecnologia
   5  * Copyright (C) 2012-2013 Tieto Poland
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <linux/device.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/usb.h>
  26 #include <linux/nfc.h>
  27 #include <linux/netdevice.h>
  28 #include <net/nfc/nfc.h>
  29 #include "pn533.h"
  30
  31 #define VERSION "0.1"
  32
  33 #define PN533_VENDOR_ID 0x4CC
  34 #define PN533_PRODUCT_ID 0x2533
  35
  36 #define SCM_VENDOR_ID 0x4E6
  37 #define SCL3711_PRODUCT_ID 0x5591
  38
  39 #define SONY_VENDOR_ID         0x054c
  40 #define PASORI_PRODUCT_ID      0x02e1
  41
  42 #define ACS_VENDOR_ID 0x072f
  43 #define ACR122U_PRODUCT_ID 0x2200
  44
  45 static const struct usb_device_id pn533_usb_table[] = {
  46         { USB_DEVICE(PN533_VENDOR_ID, PN533_PRODUCT_ID),
  47           .driver_info = PN533_DEVICE_STD },
  48         { USB_DEVICE(SCM_VENDOR_ID, SCL3711_PRODUCT_ID),
  49           .driver_info = PN533_DEVICE_STD },
  50         { USB_DEVICE(SONY_VENDOR_ID, PASORI_PRODUCT_ID),
  51           .driver_info = PN533_DEVICE_PASORI },
  52         { USB_DEVICE(ACS_VENDOR_ID, ACR122U_PRODUCT_ID),
  53           .driver_info = PN533_DEVICE_ACR122U },
  54         { }
  55 };
  56 MODULE_DEVICE_TABLE(usb, pn533_usb_table);
  57
  58 struct pn533_usb_phy {
  59         struct usb_device *udev;
  60         struct usb_interface *interface;
  61
  62         struct urb *out_urb;
  63         struct urb *in_urb;
  64
  65         struct urb *ack_urb;
  66         u8 *ack_buffer;
  67
  68         struct pn533 *priv;
  69 };
  70
  71 static void pn533_recv_response(struct urb *urb)
  72 {
  73         struct pn533_usb_phy *phy = urb->context;
  74         struct sk_buff *skb = NULL;
  75
  76         if (!urb->status) {
  77                 skb = alloc_skb(urb->actual_length, GFP_ATOMIC);
  78                 if (!skb) {
  79                         nfc_err(&phy->udev->dev, "failed to alloc memory\n");
  80                 } else {
  81                         skb_put_data(skb, urb->transfer_buffer,
  82                                      urb->actual_length);
  83                 }
  84         }
  85
  86         pn533_recv_frame(phy->priv, skb, urb->status);
  87 }
  88
  89 static int pn533_submit_urb_for_response(struct pn533_usb_phy *phy, gfp_t flags)
  90 {
  91         phy->in_urb->complete = pn533_recv_response;
  92
  93         return usb_submit_urb(phy->in_urb, flags);
  94 }
  95
  96 static void pn533_recv_ack(struct urb *urb)
  97 {
  98         struct pn533_usb_phy *phy = urb->context;
  99         struct pn533 *priv = phy->priv;
 100         struct pn533_cmd *cmd = priv->cmd;
 101         struct pn533_std_frame *in_frame;
 102         int rc;
 103
 104         cmd->status = urb->status;
 105
 106         switch (urb->status) {
 107         case 0:
 108                 break; /* success */
 109         case -ECONNRESET:
 110         case -ENOENT:
 111                 dev_dbg(&phy->udev->dev,
 112                         "The urb has been stopped (status %d)\n",
 113                         urb->status);
 114                 goto sched_wq;
 115         case -ESHUTDOWN:
 116         default:
 117                 nfc_err(&phy->udev->dev,
 118                         "Urb failure (status %d)\n", urb->status);
 119                 goto sched_wq;
 120         }
 121
 122         in_frame = phy->in_urb->transfer_buffer;
 123
 124         if (!pn533_rx_frame_is_ack(in_frame)) {
 125                 nfc_err(&phy->udev->dev, "Received an invalid ack\n");
 126                 cmd->status = -EIO;
 127                 goto sched_wq;
 128         }
 129
 130         rc = pn533_submit_urb_for_response(phy, GFP_ATOMIC);
 131         if (rc) {
 132                 nfc_err(&phy->udev->dev,
 133                         "usb_submit_urb failed with result %d\n", rc);
 134                 cmd->status = rc;
 135                 goto sched_wq;
 136         }
 137
 138         return;
 139
 140 sched_wq:
 141         queue_work(priv->wq, &priv->cmd_complete_work);
 142 }
 143
 144 static int pn533_submit_urb_for_ack(struct pn533_usb_phy *phy, gfp_t flags)
 145 {
 146         phy->in_urb->complete = pn533_recv_ack;
 147
 148         return usb_submit_urb(phy->in_urb, flags);
 149 }
 150
 151 static int pn533_usb_send_ack(struct pn533 *dev, gfp_t flags)
 152 {
 153         struct pn533_usb_phy *phy = dev->phy;
 154         static const u8 ack[6] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
 155         /* spec 7.1.1.3:  Preamble, SoPC (2), ACK Code (2), Postamble */
 156
 157         if (!phy->ack_buffer) {
 158                 phy->ack_buffer = kmemdup(ack, sizeof(ack), flags);
 159                 if (!phy->ack_buffer)
 160                         return -ENOMEM;
 161         }
 162
 163         phy->ack_urb->transfer_buffer = phy->ack_buffer;
 164         phy->ack_urb->transfer_buffer_length = sizeof(ack);
 165         return usb_submit_urb(phy->ack_urb, flags);
 166 }
 167
 168 struct pn533_out_arg {
 169         struct pn533_usb_phy *phy;
 170         struct completion done;
 171 };
 172
 173 static int pn533_usb_send_frame(struct pn533 *dev,
 174                                 struct sk_buff *out)
 175 {
 176         struct pn533_usb_phy *phy = dev->phy;
 177         struct pn533_out_arg arg;
 178         void *cntx;
 179         int rc;
 180
 181         if (phy->priv == NULL)
 182                 phy->priv = dev;
 183
 184         phy->out_urb->transfer_buffer = out->data;
 185         phy->out_urb->transfer_buffer_length = out->len;
 186
 187         print_hex_dump_debug("PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
 188                              out->data, out->len, false);
 189
 190         arg.phy = phy;
 191         init_completion(&arg.done);
 192         cntx = phy->out_urb->context;
 193         phy->out_urb->context = &arg;
 194
 195         rc = usb_submit_urb(phy->out_urb, GFP_KERNEL);
 196         if (rc)
 197                 return rc;
 198
 199         wait_for_completion(&arg.done);
 200         phy->out_urb->context = cntx;
 201
 202         if (dev->protocol_type == PN533_PROTO_REQ_RESP) {
 203                 /* request for response for sent packet directly */
 204                 rc = pn533_submit_urb_for_response(phy, GFP_KERNEL);
 205                 if (rc)
 206                         goto error;
 207         } else if (dev->protocol_type == PN533_PROTO_REQ_ACK_RESP) {
 208                 /* request for ACK if that's the case */
 209                 rc = pn533_submit_urb_for_ack(phy, GFP_KERNEL);
 210                 if (rc)
 211                         goto error;
 212         }
 213
 214         return 0;
 215
 216 error:
 217         usb_unlink_urb(phy->out_urb);
 218         return rc;
 219 }
 220
 221 static void pn533_usb_abort_cmd(struct pn533 *dev, gfp_t flags)
 222 {
 223         struct pn533_usb_phy *phy = dev->phy;
 224
 225         /* ACR122U does not support any command which aborts last
 226          * issued command i.e. as ACK for standard PN533. Additionally,
 227          * it behaves stange, sending broken or incorrect responses,
 228          * when we cancel urb before the chip will send response.
 229          */
 230         if (dev->device_type == PN533_DEVICE_ACR122U)
 231                 return;
 232
 233         /* An ack will cancel the last issued command */
 234         pn533_usb_send_ack(dev, flags);
 235
 236         /* cancel the urb request */
 237         usb_kill_urb(phy->in_urb);
 238 }
 239
 240 /* ACR122 specific structs and fucntions */
 241
 242 /* ACS ACR122 pn533 frame definitions */
 243 #define PN533_ACR122_TX_FRAME_HEADER_LEN (sizeof(struct pn533_acr122_tx_frame) \
 244                                           + 2)
 245 #define PN533_ACR122_TX_FRAME_TAIL_LEN 0
 246 #define PN533_ACR122_RX_FRAME_HEADER_LEN (sizeof(struct pn533_acr122_rx_frame) \
 247                                           + 2)
 248 #define PN533_ACR122_RX_FRAME_TAIL_LEN 2
 249 #define PN533_ACR122_FRAME_MAX_PAYLOAD_LEN PN533_STD_FRAME_MAX_PAYLOAD_LEN
 250
 251 /* CCID messages types */
 252 #define PN533_ACR122_PC_TO_RDR_ICCPOWERON 0x62
 253 #define PN533_ACR122_PC_TO_RDR_ESCAPE 0x6B
 254
 255 #define PN533_ACR122_RDR_TO_PC_ESCAPE 0x83
 256
 257
 258 struct pn533_acr122_ccid_hdr {
 259         u8 type;
 260         u32 datalen;
 261         u8 slot;
 262         u8 seq;
 263
 264         /*
 265          * 3 msg specific bytes or status, error and 1 specific
 266          * byte for reposnse msg
 267          */
 268         u8 params[3];
 269         u8 data[]; /* payload */
 270 } __packed;
 271
 272 struct pn533_acr122_apdu_hdr {
 273         u8 class;
 274         u8 ins;
 275         u8 p1;
 276         u8 p2;
 277 } __packed;
 278
 279 struct pn533_acr122_tx_frame {
 280         struct pn533_acr122_ccid_hdr ccid;
 281         struct pn533_acr122_apdu_hdr apdu;
 282         u8 datalen;
 283         u8 data[]; /* pn533 frame: TFI ... */
 284 } __packed;
 285
 286 struct pn533_acr122_rx_frame {
 287         struct pn533_acr122_ccid_hdr ccid;
 288         u8 data[]; /* pn533 frame : TFI ... */
 289 } __packed;
 290
 291 static void pn533_acr122_tx_frame_init(void *_frame, u8 cmd_code)
 292 {
 293         struct pn533_acr122_tx_frame *frame = _frame;
 294
 295         frame->ccid.type = PN533_ACR122_PC_TO_RDR_ESCAPE;
 296         /* sizeof(apdu_hdr) + sizeof(datalen) */
 297         frame->ccid.datalen = sizeof(frame->apdu) + 1;
 298         frame->ccid.slot = 0;
 299         frame->ccid.seq = 0;
 300         frame->ccid.params[0] = 0;
 301         frame->ccid.params[1] = 0;
 302         frame->ccid.params[2] = 0;
 303
 304         frame->data[0] = PN533_STD_FRAME_DIR_OUT;
 305         frame->data[1] = cmd_code;
 306         frame->datalen = 2;  /* data[0] + data[1] */
 307
 308         frame->apdu.class = 0xFF;
 309         frame->apdu.ins = 0;
 310         frame->apdu.p1 = 0;
 311         frame->apdu.p2 = 0;
 312 }
 313
 314 static void pn533_acr122_tx_frame_finish(void *_frame)
 315 {
 316         struct pn533_acr122_tx_frame *frame = _frame;
 317
 318         frame->ccid.datalen += frame->datalen;
 319 }
 320
 321 static void pn533_acr122_tx_update_payload_len(void *_frame, int len)
 322 {
 323         struct pn533_acr122_tx_frame *frame = _frame;
 324
 325         frame->datalen += len;
 326 }
 327
 328 static bool pn533_acr122_is_rx_frame_valid(void *_frame, struct pn533 *dev)
 329 {
 330         struct pn533_acr122_rx_frame *frame = _frame;
 331
 332         if (frame->ccid.type != 0x83)
 333                 return false;
 334
 335         if (!frame->ccid.datalen)
 336                 return false;
 337
 338         if (frame->data[frame->ccid.datalen - 2] == 0x63)
 339                 return false;
 340
 341         return true;
 342 }
 343
 344 static int pn533_acr122_rx_frame_size(void *frame)
 345 {
 346         struct pn533_acr122_rx_frame *f = frame;
 347
 348         /* f->ccid.datalen already includes tail length */
 349         return sizeof(struct pn533_acr122_rx_frame) + f->ccid.datalen;
 350 }
 351
 352 static u8 pn533_acr122_get_cmd_code(void *frame)
 353 {
 354         struct pn533_acr122_rx_frame *f = frame;
 355
 356         return PN533_FRAME_CMD(f);
 357 }
 358
 359 static struct pn533_frame_ops pn533_acr122_frame_ops = {
 360         .tx_frame_init = pn533_acr122_tx_frame_init,
 361         .tx_frame_finish = pn533_acr122_tx_frame_finish,
 362         .tx_update_payload_len = pn533_acr122_tx_update_payload_len,
 363         .tx_header_len = PN533_ACR122_TX_FRAME_HEADER_LEN,
 364         .tx_tail_len = PN533_ACR122_TX_FRAME_TAIL_LEN,
 365
 366         .rx_is_frame_valid = pn533_acr122_is_rx_frame_valid,
 367         .rx_header_len = PN533_ACR122_RX_FRAME_HEADER_LEN,
 368         .rx_tail_len = PN533_ACR122_RX_FRAME_TAIL_LEN,
 369         .rx_frame_size = pn533_acr122_rx_frame_size,
 370
 371         .max_payload_len = PN533_ACR122_FRAME_MAX_PAYLOAD_LEN,
 372         .get_cmd_code = pn533_acr122_get_cmd_code,
 373 };
 374
 375 struct pn533_acr122_poweron_rdr_arg {
 376         int rc;
 377         struct completion done;
 378 };
 379
 380 static void pn533_acr122_poweron_rdr_resp(struct urb *urb)
 381 {
 382         struct pn533_acr122_poweron_rdr_arg *arg = urb->context;
 383
 384         dev_dbg(&urb->dev->dev, "%s\n", __func__);
 385
 386         print_hex_dump_debug("ACR122 RX: ", DUMP_PREFIX_NONE, 16, 1,
 387                        urb->transfer_buffer, urb->transfer_buffer_length,
 388                        false);
 389
 390         arg->rc = urb->status;
 391         complete(&arg->done);
 392 }
 393
 394 static int pn533_acr122_poweron_rdr(struct pn533_usb_phy *phy)
 395 {
 396         /* Power on th reader (CCID cmd) */
 397         u8 cmd[10] = {PN533_ACR122_PC_TO_RDR_ICCPOWERON,
 398                       0, 0, 0, 0, 0, 0, 3, 0, 0};
 399         char *buffer;
 400         int transferred;
 401         int rc;
 402         void *cntx;
 403         struct pn533_acr122_poweron_rdr_arg arg;
 404
 405         dev_dbg(&phy->udev->dev, "%s\n", __func__);
 406
 407         buffer = kmemdup(cmd, sizeof(cmd), GFP_KERNEL);
 408         if (!buffer)
 409                 return -ENOMEM;
 410
 411         init_completion(&arg.done);
 412         cntx = phy->in_urb->context;  /* backup context */
 413
 414         phy->in_urb->complete = pn533_acr122_poweron_rdr_resp;
 415         phy->in_urb->context = &arg;
 416
 417         print_hex_dump_debug("ACR122 TX: ", DUMP_PREFIX_NONE, 16, 1,
 418                        cmd, sizeof(cmd), false);
 419
 420         rc = usb_bulk_msg(phy->udev, phy->out_urb->pipe, buffer, sizeof(cmd),
 421                           &transferred, 5000);
 422         kfree(buffer);
 423         if (rc || (transferred != sizeof(cmd))) {
 424                 nfc_err(&phy->udev->dev,
 425                         "Reader power on cmd error %d\n", rc);
 426                 return rc;
 427         }
 428
 429         rc =  usb_submit_urb(phy->in_urb, GFP_KERNEL);
 430         if (rc) {
 431                 nfc_err(&phy->udev->dev,
 432                         "Can't submit reader poweron cmd response %d\n", rc);
 433                 return rc;
 434         }
 435
 436         wait_for_completion(&arg.done);
 437         phy->in_urb->context = cntx; /* restore context */
 438
 439         return arg.rc;
 440 }
 441
 442 static void pn533_out_complete(struct urb *urb)
 443 {
 444         struct pn533_out_arg *arg = urb->context;
 445         struct pn533_usb_phy *phy = arg->phy;
 446
 447         switch (urb->status) {
 448         case 0:
 449                 break; /* success */
 450         case -ECONNRESET:
 451         case -ENOENT:
 452                 dev_dbg(&phy->udev->dev,
 453                         "The urb has been stopped (status %d)\n",
 454                         urb->status);
 455                 break;
 456         case -ESHUTDOWN:
 457         default:
 458                 nfc_err(&phy->udev->dev,
 459                         "Urb failure (status %d)\n",
 460                         urb->status);
 461         }
 462
 463         complete(&arg->done);
 464 }
 465
 466 static void pn533_ack_complete(struct urb *urb)
 467 {
 468         struct pn533_usb_phy *phy = urb->context;
 469
 470         switch (urb->status) {
 471         case 0:
 472                 break; /* success */
 473         case -ECONNRESET:
 474         case -ENOENT:
 475                 dev_dbg(&phy->udev->dev,
 476                         "The urb has been stopped (status %d)\n",
 477                         urb->status);
 478                 break;
 479         case -ESHUTDOWN:
 480         default:
 481                 nfc_err(&phy->udev->dev,
 482                         "Urb failure (status %d)\n",
 483                         urb->status);
 484         }
 485 }
 486
 487 static struct pn533_phy_ops usb_phy_ops = {
 488         .send_frame = pn533_usb_send_frame,
 489         .send_ack = pn533_usb_send_ack,
 490         .abort_cmd = pn533_usb_abort_cmd,
 491 };
 492
 493 static int pn533_usb_probe(struct usb_interface *interface,
 494                         const struct usb_device_id *id)
 495 {
 496         struct pn533 *priv;
 497         struct pn533_usb_phy *phy;
 498         struct usb_host_interface *iface_desc;
 499         struct usb_endpoint_descriptor *endpoint;
 500         int in_endpoint = 0;
 501         int out_endpoint = 0;
 502         int rc = -ENOMEM;
 503         int i;
 504         u32 protocols;
 505         enum pn533_protocol_type protocol_type = PN533_PROTO_REQ_ACK_RESP;
 506         struct pn533_frame_ops *fops = NULL;
 507         unsigned char *in_buf;
 508         int in_buf_len = PN533_EXT_FRAME_HEADER_LEN +
 509                          PN533_STD_FRAME_MAX_PAYLOAD_LEN +
 510                          PN533_STD_FRAME_TAIL_LEN;
 511
 512         phy = devm_kzalloc(&interface->dev, sizeof(*phy), GFP_KERNEL);
 513         if (!phy)
 514                 return -ENOMEM;
 515
 516         in_buf = kzalloc(in_buf_len, GFP_KERNEL);
 517         if (!in_buf)
 518                 return -ENOMEM;
 519
 520         phy->udev = usb_get_dev(interface_to_usbdev(interface));
 521         phy->interface = interface;
 522
 523         iface_desc = interface->cur_altsetting;
 524         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 525                 endpoint = &iface_desc->endpoint[i].desc;
 526
 527                 if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
 528                         in_endpoint = endpoint->bEndpointAddress;
 529
 530                 if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
 531                         out_endpoint = endpoint->bEndpointAddress;
 532         }
 533
 534         if (!in_endpoint || !out_endpoint) {
 535                 nfc_err(&interface->dev,
 536                         "Could not find bulk-in or bulk-out endpoint\n");
 537                 rc = -ENODEV;
 538                 goto error;
 539         }
 540
 541         phy->in_urb = usb_alloc_urb(0, GFP_KERNEL);
 542         phy->out_urb = usb_alloc_urb(0, GFP_KERNEL);
 543         phy->ack_urb = usb_alloc_urb(0, GFP_KERNEL);
 544
 545         if (!phy->in_urb || !phy->out_urb || !phy->ack_urb)
 546                 goto error;
 547
 548         usb_fill_bulk_urb(phy->in_urb, phy->udev,
 549                           usb_rcvbulkpipe(phy->udev, in_endpoint),
 550                           in_buf, in_buf_len, NULL, phy);
 551
 552         usb_fill_bulk_urb(phy->out_urb, phy->udev,
 553                           usb_sndbulkpipe(phy->udev, out_endpoint),
 554                           NULL, 0, pn533_out_complete, phy);
 555         usb_fill_bulk_urb(phy->ack_urb, phy->udev,
 556                           usb_sndbulkpipe(phy->udev, out_endpoint),
 557                           NULL, 0, pn533_ack_complete, phy);
 558
 559         switch (id->driver_info) {
 560         case PN533_DEVICE_STD:
 561                 protocols = PN533_ALL_PROTOCOLS;
 562                 break;
 563
 564         case PN533_DEVICE_PASORI:
 565                 protocols = PN533_NO_TYPE_B_PROTOCOLS;
 566                 break;
 567
 568         case PN533_DEVICE_ACR122U:
 569                 protocols = PN533_NO_TYPE_B_PROTOCOLS;
 570                 fops = &pn533_acr122_frame_ops;
 571                 protocol_type = PN533_PROTO_REQ_RESP,
 572
 573                 rc = pn533_acr122_poweron_rdr(phy);
 574                 if (rc < 0) {
 575                         nfc_err(&interface->dev,
 576                                 "Couldn't poweron the reader (error %d)\n", rc);
 577                         goto error;
 578                 }
 579                 break;
 580
 581         default:
 582                 nfc_err(&interface->dev, "Unknown device type %lu\n",
 583                         id->driver_info);
 584                 rc = -EINVAL;
 585                 goto error;
 586         }
 587
 588         priv = pn533_register_device(id->driver_info, protocols, protocol_type,
 589                                         phy, &usb_phy_ops, fops,
 590                                         &phy->udev->dev, &interface->dev);
 591
 592         if (IS_ERR(priv)) {
 593                 rc = PTR_ERR(priv);
 594                 goto error;
 595         }
 596
 597         phy->priv = priv;
 598
 599         rc = pn533_finalize_setup(priv);
 600         if (rc)
 601                 goto err_deregister;
 602
 603         usb_set_intfdata(interface, phy);
 604
 605         return 0;
 606
 607 err_deregister:
 608         pn533_unregister_device(phy->priv);
 609 error:
 610         usb_kill_urb(phy->in_urb);
 611         usb_kill_urb(phy->out_urb);
 612         usb_kill_urb(phy->ack_urb);
 613
 614         usb_free_urb(phy->in_urb);
 615         usb_free_urb(phy->out_urb);
 616         usb_free_urb(phy->ack_urb);
 617         usb_put_dev(phy->udev);
 618         kfree(in_buf);
 619         kfree(phy->ack_buffer);
 620
 621         return rc;
 622 }
 623
 624 static void pn533_usb_disconnect(struct usb_interface *interface)
 625 {
 626         struct pn533_usb_phy *phy = usb_get_intfdata(interface);
 627
 628         if (!phy)
 629                 return;
 630
 631         pn533_unregister_device(phy->priv);
 632
 633         usb_set_intfdata(interface, NULL);
 634
 635         usb_kill_urb(phy->in_urb);
 636         usb_kill_urb(phy->out_urb);
 637         usb_kill_urb(phy->ack_urb);
 638
 639         kfree(phy->in_urb->transfer_buffer);
 640         usb_free_urb(phy->in_urb);
 641         usb_free_urb(phy->out_urb);
 642         usb_free_urb(phy->ack_urb);
 643         kfree(phy->ack_buffer);
 644
 645         nfc_info(&interface->dev, "NXP PN533 NFC device disconnected\n");
 646 }
 647
 648 static struct usb_driver pn533_usb_driver = {
 649         .name =         "pn533_usb",
 650         .probe =        pn533_usb_probe,
 651         .disconnect =   pn533_usb_disconnect,
 652         .id_table =     pn533_usb_table,
 653 };
 654
 655 module_usb_driver(pn533_usb_driver);
 656
 657 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
 658 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
 659 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
 660 MODULE_DESCRIPTION("PN533 USB driver ver " VERSION);
 661 MODULE_VERSION(VERSION);
 662 MODULE_LICENSE("GPL");