drivers/bluetooth/bpa10x.c

   1 /*
   2  *
   3  *  Digianswer Bluetooth USB driver
   4  *
   5  *  Copyright (C) 2004-2007  Marcel Holtmann <marcel@holtmann.org>
   6  *
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/slab.h>
  28 #include <linux/types.h>
  29 #include <linux/sched.h>
  30 #include <linux/errno.h>
  31 #include <linux/skbuff.h>
  32
  33 #include <linux/usb.h>
  34
  35 #include <net/bluetooth/bluetooth.h>
  36 #include <net/bluetooth/hci_core.h>
  37
  38 #ifndef CONFIG_BT_HCIBPA10X_DEBUG
  39 #undef  BT_DBG
  40 #define BT_DBG(D...)
  41 #endif
  42
  43 #define VERSION "0.10"
  44
  45 static struct usb_device_id bpa10x_table[] = {
  46         /* Tektronix BPA 100/105 (Digianswer) */
  47         { USB_DEVICE(0x08fd, 0x0002) },
  48
  49         { }     /* Terminating entry */
  50 };
  51
  52 MODULE_DEVICE_TABLE(usb, bpa10x_table);
  53
  54 struct bpa10x_data {
  55         struct hci_dev    *hdev;
  56         struct usb_device *udev;
  57
  58         struct usb_anchor tx_anchor;
  59         struct usb_anchor rx_anchor;
  60
  61         struct sk_buff *rx_skb[2];
  62 };
  63
  64 #define HCI_VENDOR_HDR_SIZE 5
  65
  66 struct hci_vendor_hdr {
  67         __u8    type;
  68         __le16  snum;
  69         __le16  dlen;
  70 } __attribute__ ((packed));
  71
  72 static int bpa10x_recv(struct hci_dev *hdev, int queue, void *buf, int count)
  73 {
  74         struct bpa10x_data *data = hdev->driver_data;
  75
  76         BT_DBG("%s queue %d buffer %p count %d", hdev->name,
  77                                                         queue, buf, count);
  78
  79         if (queue < 0 || queue > 1)
  80                 return -EILSEQ;
  81
  82         hdev->stat.byte_rx += count;
  83
  84         while (count) {
  85                 struct sk_buff *skb = data->rx_skb[queue];
  86                 struct { __u8 type; int expect; } *scb;
  87                 int type, len = 0;
  88
  89                 if (!skb) {
  90                         /* Start of the frame */
  91
  92                         type = *((__u8 *) buf);
  93                         count--; buf++;
  94
  95                         switch (type) {
  96                         case HCI_EVENT_PKT:
  97                                 if (count >= HCI_EVENT_HDR_SIZE) {
  98                                         struct hci_event_hdr *h = buf;
  99                                         len = HCI_EVENT_HDR_SIZE + h->plen;
 100                                 } else
 101                                         return -EILSEQ;
 102                                 break;
 103
 104                         case HCI_ACLDATA_PKT:
 105                                 if (count >= HCI_ACL_HDR_SIZE) {
 106                                         struct hci_acl_hdr *h = buf;
 107                                         len = HCI_ACL_HDR_SIZE +
 108                                                         __le16_to_cpu(h->dlen);
 109                                 } else
 110                                         return -EILSEQ;
 111                                 break;
 112
 113                         case HCI_SCODATA_PKT:
 114                                 if (count >= HCI_SCO_HDR_SIZE) {
 115                                         struct hci_sco_hdr *h = buf;
 116                                         len = HCI_SCO_HDR_SIZE + h->dlen;
 117                                 } else
 118                                         return -EILSEQ;
 119                                 break;
 120
 121                         case HCI_VENDOR_PKT:
 122                                 if (count >= HCI_VENDOR_HDR_SIZE) {
 123                                         struct hci_vendor_hdr *h = buf;
 124                                         len = HCI_VENDOR_HDR_SIZE +
 125                                                         __le16_to_cpu(h->dlen);
 126                                 } else
 127                                         return -EILSEQ;
 128                                 break;
 129                         }
 130
 131                         skb = bt_skb_alloc(len, GFP_ATOMIC);
 132                         if (!skb) {
 133                                 BT_ERR("%s no memory for packet", hdev->name);
 134                                 return -ENOMEM;
 135                         }
 136
 137                         skb->dev = (void *) hdev;
 138
 139                         data->rx_skb[queue] = skb;
 140
 141                         scb = (void *) skb->cb;
 142                         scb->type = type;
 143                         scb->expect = len;
 144                 } else {
 145                         /* Continuation */
 146
 147                         scb = (void *) skb->cb;
 148                         len = scb->expect;
 149                 }
 150
 151                 len = min(len, count);
 152
 153                 memcpy(skb_put(skb, len), buf, len);
 154
 155                 scb->expect -= len;
 156
 157                 if (scb->expect == 0) {
 158                         /* Complete frame */
 159
 160                         data->rx_skb[queue] = NULL;
 161
 162                         bt_cb(skb)->pkt_type = scb->type;
 163                         hci_recv_frame(skb);
 164                 }
 165
 166                 count -= len; buf += len;
 167         }
 168
 169         return 0;
 170 }
 171
 172 static void bpa10x_tx_complete(struct urb *urb)
 173 {
 174         struct sk_buff *skb = urb->context;
 175         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
 176
 177         BT_DBG("%s urb %p status %d count %d", hdev->name,
 178                                         urb, urb->status, urb->actual_length);
 179
 180         if (!test_bit(HCI_RUNNING, &hdev->flags))
 181                 goto done;
 182
 183         if (!urb->status)
 184                 hdev->stat.byte_tx += urb->transfer_buffer_length;
 185         else
 186                 hdev->stat.err_tx++;
 187
 188 done:
 189         kfree(urb->setup_packet);
 190
 191         kfree_skb(skb);
 192 }
 193
 194 static void bpa10x_rx_complete(struct urb *urb)
 195 {
 196         struct hci_dev *hdev = urb->context;
 197         struct bpa10x_data *data = hdev->driver_data;
 198         int err;
 199
 200         BT_DBG("%s urb %p status %d count %d", hdev->name,
 201                                         urb, urb->status, urb->actual_length);
 202
 203         if (!test_bit(HCI_RUNNING, &hdev->flags))
 204                 return;
 205
 206         if (urb->status == 0) {
 207                 if (bpa10x_recv(hdev, usb_pipebulk(urb->pipe),
 208                                                 urb->transfer_buffer,
 209                                                 urb->actual_length) < 0) {
 210                         BT_ERR("%s corrupted event packet", hdev->name);
 211                         hdev->stat.err_rx++;
 212                 }
 213         }
 214
 215         usb_anchor_urb(urb, &data->rx_anchor);
 216
 217         err = usb_submit_urb(urb, GFP_ATOMIC);
 218         if (err < 0) {
 219                 BT_ERR("%s urb %p failed to resubmit (%d)",
 220                                                 hdev->name, urb, -err);
 221                 usb_unanchor_urb(urb);
 222         }
 223 }
 224
 225 static inline int bpa10x_submit_intr_urb(struct hci_dev *hdev)
 226 {
 227         struct bpa10x_data *data = hdev->driver_data;
 228         struct urb *urb;
 229         unsigned char *buf;
 230         unsigned int pipe;
 231         int err, size = 16;
 232
 233         BT_DBG("%s", hdev->name);
 234
 235         urb = usb_alloc_urb(0, GFP_KERNEL);
 236         if (!urb)
 237                 return -ENOMEM;
 238
 239         buf = kmalloc(size, GFP_KERNEL);
 240         if (!buf) {
 241                 usb_free_urb(urb);
 242                 return -ENOMEM;
 243         }
 244
 245         pipe = usb_rcvintpipe(data->udev, 0x81);
 246
 247         usb_fill_int_urb(urb, data->udev, pipe, buf, size,
 248                                                 bpa10x_rx_complete, hdev, 1);
 249
 250         urb->transfer_flags |= URB_FREE_BUFFER;
 251
 252         usb_anchor_urb(urb, &data->rx_anchor);
 253
 254         err = usb_submit_urb(urb, GFP_KERNEL);
 255         if (err < 0) {
 256                 BT_ERR("%s urb %p submission failed (%d)",
 257                                                 hdev->name, urb, -err);
 258                 usb_unanchor_urb(urb);
 259                 kfree(buf);
 260         }
 261
 262         usb_free_urb(urb);
 263
 264         return err;
 265 }
 266
 267 static inline int bpa10x_submit_bulk_urb(struct hci_dev *hdev)
 268 {
 269         struct bpa10x_data *data = hdev->driver_data;
 270         struct urb *urb;
 271         unsigned char *buf;
 272         unsigned int pipe;
 273         int err, size = 64;
 274
 275         BT_DBG("%s", hdev->name);
 276
 277         urb = usb_alloc_urb(0, GFP_KERNEL);
 278         if (!urb)
 279                 return -ENOMEM;
 280
 281         buf = kmalloc(size, GFP_KERNEL);
 282         if (!buf) {
 283                 usb_free_urb(urb);
 284                 return -ENOMEM;
 285         }
 286
 287         pipe = usb_rcvbulkpipe(data->udev, 0x82);
 288
 289         usb_fill_bulk_urb(urb, data->udev, pipe,
 290                                         buf, size, bpa10x_rx_complete, hdev);
 291
 292         urb->transfer_flags |= URB_FREE_BUFFER;
 293
 294         usb_anchor_urb(urb, &data->rx_anchor);
 295
 296         err = usb_submit_urb(urb, GFP_KERNEL);
 297         if (err < 0) {
 298                 BT_ERR("%s urb %p submission failed (%d)",
 299                                                 hdev->name, urb, -err);
 300                 usb_unanchor_urb(urb);
 301                 kfree(buf);
 302         }
 303
 304         usb_free_urb(urb);
 305
 306         return err;
 307 }
 308
 309 static int bpa10x_open(struct hci_dev *hdev)
 310 {
 311         struct bpa10x_data *data = hdev->driver_data;
 312         int err;
 313
 314         BT_DBG("%s", hdev->name);
 315
 316         if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
 317                 return 0;
 318
 319         err = bpa10x_submit_intr_urb(hdev);
 320         if (err < 0)
 321                 goto error;
 322
 323         err = bpa10x_submit_bulk_urb(hdev);
 324         if (err < 0)
 325                 goto error;
 326
 327         return 0;
 328
 329 error:
 330         usb_kill_anchored_urbs(&data->rx_anchor);
 331
 332         clear_bit(HCI_RUNNING, &hdev->flags);
 333
 334         return err;
 335 }
 336
 337 static int bpa10x_close(struct hci_dev *hdev)
 338 {
 339         struct bpa10x_data *data = hdev->driver_data;
 340
 341         BT_DBG("%s", hdev->name);
 342
 343         if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
 344                 return 0;
 345
 346         usb_kill_anchored_urbs(&data->rx_anchor);
 347
 348         return 0;
 349 }
 350
 351 static int bpa10x_flush(struct hci_dev *hdev)
 352 {
 353         struct bpa10x_data *data = hdev->driver_data;
 354
 355         BT_DBG("%s", hdev->name);
 356
 357         usb_kill_anchored_urbs(&data->tx_anchor);
 358
 359         return 0;
 360 }
 361
 362 static int bpa10x_send_frame(struct sk_buff *skb)
 363 {
 364         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
 365         struct bpa10x_data *data = hdev->driver_data;
 366         struct usb_ctrlrequest *dr;
 367         struct urb *urb;
 368         unsigned int pipe;
 369         int err;
 370
 371         BT_DBG("%s", hdev->name);
 372
 373         if (!test_bit(HCI_RUNNING, &hdev->flags))
 374                 return -EBUSY;
 375
 376         urb = usb_alloc_urb(0, GFP_ATOMIC);
 377         if (!urb)
 378                 return -ENOMEM;
 379
 380         /* Prepend skb with frame type */
 381         *skb_push(skb, 1) = bt_cb(skb)->pkt_type;
 382
 383         switch (bt_cb(skb)->pkt_type) {
 384         case HCI_COMMAND_PKT:
 385                 dr = kmalloc(sizeof(*dr), GFP_ATOMIC);
 386                 if (!dr) {
 387                         usb_free_urb(urb);
 388                         return -ENOMEM;
 389                 }
 390
 391                 dr->bRequestType = USB_TYPE_VENDOR;
 392                 dr->bRequest     = 0;
 393                 dr->wIndex       = 0;
 394                 dr->wValue       = 0;
 395                 dr->wLength      = __cpu_to_le16(skb->len);
 396
 397                 pipe = usb_sndctrlpipe(data->udev, 0x00);
 398
 399                 usb_fill_control_urb(urb, data->udev, pipe, (void *) dr,
 400                                 skb->data, skb->len, bpa10x_tx_complete, skb);
 401
 402                 hdev->stat.cmd_tx++;
 403                 break;
 404
 405         case HCI_ACLDATA_PKT:
 406                 pipe = usb_sndbulkpipe(data->udev, 0x02);
 407
 408                 usb_fill_bulk_urb(urb, data->udev, pipe,
 409                                 skb->data, skb->len, bpa10x_tx_complete, skb);
 410
 411                 hdev->stat.acl_tx++;
 412                 break;
 413
 414         case HCI_SCODATA_PKT:
 415                 pipe = usb_sndbulkpipe(data->udev, 0x02);
 416
 417                 usb_fill_bulk_urb(urb, data->udev, pipe,
 418                                 skb->data, skb->len, bpa10x_tx_complete, skb);
 419
 420                 hdev->stat.sco_tx++;
 421                 break;
 422
 423         default:
 424                 usb_free_urb(urb);
 425                 return -EILSEQ;
 426         }
 427
 428         usb_anchor_urb(urb, &data->tx_anchor);
 429
 430         err = usb_submit_urb(urb, GFP_ATOMIC);
 431         if (err < 0) {
 432                 BT_ERR("%s urb %p submission failed", hdev->name, urb);
 433                 kfree(urb->setup_packet);
 434                 usb_unanchor_urb(urb);
 435         }
 436
 437         usb_free_urb(urb);
 438
 439         return 0;
 440 }
 441
 442 static void bpa10x_destruct(struct hci_dev *hdev)
 443 {
 444         struct bpa10x_data *data = hdev->driver_data;
 445
 446         BT_DBG("%s", hdev->name);
 447
 448         kfree(data->rx_skb[0]);
 449         kfree(data->rx_skb[1]);
 450         kfree(data);
 451 }
 452
 453 static int bpa10x_probe(struct usb_interface *intf, const struct usb_device_id *id)
 454 {
 455         struct bpa10x_data *data;
 456         struct hci_dev *hdev;
 457         int err;
 458
 459         BT_DBG("intf %p id %p", intf, id);
 460
 461         if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
 462                 return -ENODEV;
 463
 464         data = kzalloc(sizeof(*data), GFP_KERNEL);
 465         if (!data)
 466                 return -ENOMEM;
 467
 468         data->udev = interface_to_usbdev(intf);
 469
 470         init_usb_anchor(&data->tx_anchor);
 471         init_usb_anchor(&data->rx_anchor);
 472
 473         hdev = hci_alloc_dev();
 474         if (!hdev) {
 475                 kfree(data);
 476                 return -ENOMEM;
 477         }
 478
 479         hdev->type = HCI_USB;
 480         hdev->driver_data = data;
 481
 482         data->hdev = hdev;
 483
 484         SET_HCIDEV_DEV(hdev, &intf->dev);
 485
 486         hdev->open     = bpa10x_open;
 487         hdev->close    = bpa10x_close;
 488         hdev->flush    = bpa10x_flush;
 489         hdev->send     = bpa10x_send_frame;
 490         hdev->destruct = bpa10x_destruct;
 491
 492         hdev->owner = THIS_MODULE;
 493
 494         err = hci_register_dev(hdev);
 495         if (err < 0) {
 496                 hci_free_dev(hdev);
 497                 kfree(data);
 498                 return err;
 499         }
 500
 501         usb_set_intfdata(intf, data);
 502
 503         return 0;
 504 }
 505
 506 static void bpa10x_disconnect(struct usb_interface *intf)
 507 {
 508         struct bpa10x_data *data = usb_get_intfdata(intf);
 509
 510         BT_DBG("intf %p", intf);
 511
 512         if (!data)
 513                 return;
 514
 515         usb_set_intfdata(intf, NULL);
 516
 517         hci_unregister_dev(data->hdev);
 518
 519         hci_free_dev(data->hdev);
 520 }
 521
 522 static struct usb_driver bpa10x_driver = {
 523         .name           = "bpa10x",
 524         .probe          = bpa10x_probe,
 525         .disconnect     = bpa10x_disconnect,
 526         .id_table       = bpa10x_table,
 527 };
 528
 529 static int __init bpa10x_init(void)
 530 {
 531         BT_INFO("Digianswer Bluetooth USB driver ver %s", VERSION);
 532
 533         return usb_register(&bpa10x_driver);
 534 }
 535
 536 static void __exit bpa10x_exit(void)
 537 {
 538         usb_deregister(&bpa10x_driver);
 539 }
 540
 541 module_init(bpa10x_init);
 542 module_exit(bpa10x_exit);
 543
 544 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 545 MODULE_DESCRIPTION("Digianswer Bluetooth USB driver ver " VERSION);
 546 MODULE_VERSION(VERSION);
 547 MODULE_LICENSE("GPL");