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 "0.9"
  44
  45 static int ignore = 0;
  46
  47 static struct usb_device_id bpa10x_table[] = {
  48         /* Tektronix BPA 100/105 (Digianswer) */
  49         { USB_DEVICE(0x08fd, 0x0002) },
  50
  51         { }     /* Terminating entry */
  52 };
  53
  54 MODULE_DEVICE_TABLE(usb, bpa10x_table);
  55
  56 struct bpa10x_data {
  57         struct hci_dev    *hdev;
  58         struct usb_device *udev;
  59
  60         struct usb_anchor tx_anchor;
  61         struct usb_anchor rx_anchor;
  62
  63         struct sk_buff *rx_skb[2];
  64 };
  65
  66 #define HCI_VENDOR_HDR_SIZE 5
  67
  68 struct hci_vendor_hdr {
  69         __u8    type;
  70         __le16  snum;
  71         __le16  dlen;
  72 } __attribute__ ((packed));
  73
  74 static int bpa10x_recv(struct hci_dev *hdev, int queue, void *buf, int count)
  75 {
  76         struct bpa10x_data *data = hdev->driver_data;
  77
  78         BT_DBG("%s queue %d buffer %p count %d", hdev->name,
  79                                                         queue, buf, count);
  80
  81         if (queue < 0 || queue > 1)
  82                 return -EILSEQ;
  83
  84         hdev->stat.byte_rx += count;
  85
  86         while (count) {
  87                 struct sk_buff *skb = data->rx_skb[queue];
  88                 struct { __u8 type; int expect; } *scb;
  89                 int type, len = 0;
  90
  91                 if (!skb) {
  92                         /* Start of the frame */
  93
  94                         type = *((__u8 *) buf);
  95                         count--; buf++;
  96
  97                         switch (type) {
  98                         case HCI_EVENT_PKT:
  99                                 if (count >= HCI_EVENT_HDR_SIZE) {
 100                                         struct hci_event_hdr *h = buf;
 101                                         len = HCI_EVENT_HDR_SIZE + h->plen;
 102                                 } else
 103                                         return -EILSEQ;
 104                                 break;
 105
 106                         case HCI_ACLDATA_PKT:
 107                                 if (count >= HCI_ACL_HDR_SIZE) {
 108                                         struct hci_acl_hdr *h = buf;
 109                                         len = HCI_ACL_HDR_SIZE +
 110                                                         __le16_to_cpu(h->dlen);
 111                                 } else
 112                                         return -EILSEQ;
 113                                 break;
 114
 115                         case HCI_SCODATA_PKT:
 116                                 if (count >= HCI_SCO_HDR_SIZE) {
 117                                         struct hci_sco_hdr *h = buf;
 118                                         len = HCI_SCO_HDR_SIZE + h->dlen;
 119                                 } else
 120                                         return -EILSEQ;
 121                                 break;
 122
 123                         case HCI_VENDOR_PKT:
 124                                 if (count >= HCI_VENDOR_HDR_SIZE) {
 125                                         struct hci_vendor_hdr *h = buf;
 126                                         len = HCI_VENDOR_HDR_SIZE +
 127                                                         __le16_to_cpu(h->dlen);
 128                                 } else
 129                                         return -EILSEQ;
 130                                 break;
 131                         }
 132
 133                         skb = bt_skb_alloc(len, GFP_ATOMIC);
 134                         if (!skb) {
 135                                 BT_ERR("%s no memory for packet", hdev->name);
 136                                 return -ENOMEM;
 137                         }
 138
 139                         skb->dev = (void *) hdev;
 140
 141                         data->rx_skb[queue] = skb;
 142
 143                         scb = (void *) skb->cb;
 144                         scb->type = type;
 145                         scb->expect = len;
 146                 } else {
 147                         /* Continuation */
 148
 149                         scb = (void *) skb->cb;
 150                         len = scb->expect;
 151                 }
 152
 153                 len = min(len, count);
 154
 155                 memcpy(skb_put(skb, len), buf, len);
 156
 157                 scb->expect -= len;
 158
 159                 if (scb->expect == 0) {
 160                         /* Complete frame */
 161
 162                         data->rx_skb[queue] = NULL;
 163
 164                         bt_cb(skb)->pkt_type = scb->type;
 165                         hci_recv_frame(skb);
 166                 }
 167
 168                 count -= len; buf += len;
 169         }
 170
 171         return 0;
 172 }
 173
 174 static void bpa10x_tx_complete(struct urb *urb)
 175 {
 176         struct sk_buff *skb = urb->context;
 177         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
 178
 179         BT_DBG("%s urb %p status %d count %d", hdev->name,
 180                                         urb, urb->status, urb->actual_length);
 181
 182         if (!test_bit(HCI_RUNNING, &hdev->flags))
 183                 goto done;
 184
 185         if (!urb->status)
 186                 hdev->stat.byte_tx += urb->transfer_buffer_length;
 187         else
 188                 hdev->stat.err_tx++;
 189
 190 done:
 191         kfree(urb->setup_packet);
 192
 193         kfree_skb(skb);
 194 }
 195
 196 static void bpa10x_rx_complete(struct urb *urb)
 197 {
 198         struct hci_dev *hdev = urb->context;
 199         struct bpa10x_data *data = hdev->driver_data;
 200         int err;
 201
 202         BT_DBG("%s urb %p status %d count %d", hdev->name,
 203                                         urb, urb->status, urb->actual_length);
 204
 205         if (!test_bit(HCI_RUNNING, &hdev->flags))
 206                 return;
 207
 208         if (urb->status == 0) {
 209                 if (bpa10x_recv(hdev, usb_pipebulk(urb->pipe),
 210                                                 urb->transfer_buffer,
 211                                                 urb->actual_length) < 0) {
 212                         BT_ERR("%s corrupted event packet", hdev->name);
 213                         hdev->stat.err_rx++;
 214                 }
 215         }
 216
 217         usb_anchor_urb(urb, &data->rx_anchor);
 218
 219         err = usb_submit_urb(urb, GFP_ATOMIC);
 220         if (err < 0) {
 221                 BT_ERR("%s urb %p failed to resubmit (%d)",
 222                                                 hdev->name, urb, -err);
 223                 usb_unanchor_urb(urb);
 224         }
 225 }
 226
 227 static inline int bpa10x_submit_intr_urb(struct hci_dev *hdev)
 228 {
 229         struct bpa10x_data *data = hdev->driver_data;
 230         struct urb *urb;
 231         unsigned char *buf;
 232         unsigned int pipe;
 233         int err, size = 16;
 234
 235         BT_DBG("%s", hdev->name);
 236
 237         urb = usb_alloc_urb(0, GFP_KERNEL);
 238         if (!urb)
 239                 return -ENOMEM;
 240
 241         buf = kmalloc(size, GFP_KERNEL);
 242         if (!buf) {
 243                 usb_free_urb(urb);
 244                 return -ENOMEM;
 245         }
 246
 247         pipe = usb_rcvintpipe(data->udev, 0x81);
 248
 249         usb_fill_int_urb(urb, data->udev, pipe, buf, size,
 250                                                 bpa10x_rx_complete, hdev, 1);
 251
 252         urb->transfer_flags |= URB_FREE_BUFFER;
 253
 254         usb_anchor_urb(urb, &data->rx_anchor);
 255
 256         err = usb_submit_urb(urb, GFP_KERNEL);
 257         if (err < 0) {
 258                 BT_ERR("%s urb %p submission failed (%d)",
 259                                                 hdev->name, urb, -err);
 260                 usb_unanchor_urb(urb);
 261                 kfree(buf);
 262         }
 263
 264         usb_free_urb(urb);
 265
 266         return err;
 267 }
 268
 269 static inline int bpa10x_submit_bulk_urb(struct hci_dev *hdev)
 270 {
 271         struct bpa10x_data *data = hdev->driver_data;
 272         struct urb *urb;
 273         unsigned char *buf;
 274         unsigned int pipe;
 275         int err, size = 64;
 276
 277         BT_DBG("%s", hdev->name);
 278
 279         urb = usb_alloc_urb(0, GFP_KERNEL);
 280         if (!urb)
 281                 return -ENOMEM;
 282
 283         buf = kmalloc(size, GFP_KERNEL);
 284         if (!buf) {
 285                 usb_free_urb(urb);
 286                 return -ENOMEM;
 287         }
 288
 289         pipe = usb_rcvbulkpipe(data->udev, 0x82);
 290
 291         usb_fill_bulk_urb(urb, data->udev, pipe,
 292                                         buf, size, bpa10x_rx_complete, hdev);
 293
 294         urb->transfer_flags |= URB_FREE_BUFFER;
 295
 296         usb_anchor_urb(urb, &data->rx_anchor);
 297
 298         err = usb_submit_urb(urb, GFP_KERNEL);
 299         if (err < 0) {
 300                 BT_ERR("%s urb %p submission failed (%d)",
 301                                                 hdev->name, urb, -err);
 302                 usb_unanchor_urb(urb);
 303                 kfree(buf);
 304         }
 305
 306         usb_free_urb(urb);
 307
 308         return err;
 309 }
 310
 311 static int bpa10x_open(struct hci_dev *hdev)
 312 {
 313         struct bpa10x_data *data = hdev->driver_data;
 314         int err;
 315
 316         BT_DBG("%s", hdev->name);
 317
 318         if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
 319                 return 0;
 320
 321         err = bpa10x_submit_intr_urb(hdev);
 322         if (err < 0)
 323                 goto error;
 324
 325         err = bpa10x_submit_bulk_urb(hdev);
 326         if (err < 0)
 327                 goto error;
 328
 329         return 0;
 330
 331 error:
 332         usb_kill_anchored_urbs(&data->rx_anchor);
 333
 334         clear_bit(HCI_RUNNING, &hdev->flags);
 335
 336         return err;
 337 }
 338
 339 static int bpa10x_close(struct hci_dev *hdev)
 340 {
 341         struct bpa10x_data *data = hdev->driver_data;
 342
 343         BT_DBG("%s", hdev->name);
 344
 345         if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
 346                 return 0;
 347
 348         usb_kill_anchored_urbs(&data->rx_anchor);
 349
 350         return 0;
 351 }
 352
 353 static int bpa10x_flush(struct hci_dev *hdev)
 354 {
 355         struct bpa10x_data *data = hdev->driver_data;
 356
 357         BT_DBG("%s", hdev->name);
 358
 359         usb_kill_anchored_urbs(&data->tx_anchor);
 360
 361         return 0;
 362 }
 363
 364 static int bpa10x_send_frame(struct sk_buff *skb)
 365 {
 366         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
 367         struct bpa10x_data *data = hdev->driver_data;
 368         struct usb_ctrlrequest *dr;
 369         struct urb *urb;
 370         unsigned int pipe;
 371         int err;
 372
 373         BT_DBG("%s", hdev->name);
 374
 375         if (!test_bit(HCI_RUNNING, &hdev->flags))
 376                 return -EBUSY;
 377
 378         urb = usb_alloc_urb(0, GFP_ATOMIC);
 379         if (!urb)
 380                 return -ENOMEM;
 381
 382         /* Prepend skb with frame type */
 383         *skb_push(skb, 1) = bt_cb(skb)->pkt_type;
 384
 385         switch (bt_cb(skb)->pkt_type) {
 386         case HCI_COMMAND_PKT:
 387                 dr = kmalloc(sizeof(*dr), GFP_ATOMIC);
 388                 if (!dr) {
 389                         usb_free_urb(urb);
 390                         return -ENOMEM;
 391                 }
 392
 393                 dr->bRequestType = USB_TYPE_VENDOR;
 394                 dr->bRequest     = 0;
 395                 dr->wIndex       = 0;
 396                 dr->wValue       = 0;
 397                 dr->wLength      = __cpu_to_le16(skb->len);
 398
 399                 pipe = usb_sndctrlpipe(data->udev, 0x00);
 400
 401                 usb_fill_control_urb(urb, data->udev, pipe, (void *) dr,
 402                                 skb->data, skb->len, bpa10x_tx_complete, skb);
 403
 404                 hdev->stat.cmd_tx++;
 405                 break;
 406
 407         case HCI_ACLDATA_PKT:
 408                 pipe = usb_sndbulkpipe(data->udev, 0x02);
 409
 410                 usb_fill_bulk_urb(urb, data->udev, pipe,
 411                                 skb->data, skb->len, bpa10x_tx_complete, skb);
 412
 413                 hdev->stat.acl_tx++;
 414                 break;
 415
 416         case HCI_SCODATA_PKT:
 417                 pipe = usb_sndbulkpipe(data->udev, 0x02);
 418
 419                 usb_fill_bulk_urb(urb, data->udev, pipe,
 420                                 skb->data, skb->len, bpa10x_tx_complete, skb);
 421
 422                 hdev->stat.sco_tx++;
 423                 break;
 424
 425         default:
 426                 usb_free_urb(urb);
 427                 return -EILSEQ;
 428         }
 429
 430         usb_anchor_urb(urb, &data->tx_anchor);
 431
 432         err = usb_submit_urb(urb, GFP_ATOMIC);
 433         if (err < 0) {
 434                 BT_ERR("%s urb %p submission failed", hdev->name, urb);
 435                 kfree(urb->setup_packet);
 436                 usb_unanchor_urb(urb);
 437         }
 438
 439         usb_free_urb(urb);
 440
 441         return 0;
 442 }
 443
 444 static void bpa10x_destruct(struct hci_dev *hdev)
 445 {
 446         struct bpa10x_data *data = hdev->driver_data;
 447
 448         BT_DBG("%s", hdev->name);
 449
 450         kfree(data->rx_skb[0]);
 451         kfree(data->rx_skb[1]);
 452         kfree(data);
 453 }
 454
 455 static int bpa10x_probe(struct usb_interface *intf, const struct usb_device_id *id)
 456 {
 457         struct bpa10x_data *data;
 458         struct hci_dev *hdev;
 459         int err;
 460
 461         BT_DBG("intf %p id %p", intf, id);
 462
 463         if (ignore)
 464                 return -ENODEV;
 465
 466         if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
 467                 return -ENODEV;
 468
 469         data = kzalloc(sizeof(*data), GFP_KERNEL);
 470         if (!data)
 471                 return -ENOMEM;
 472
 473         data->udev = interface_to_usbdev(intf);
 474
 475         init_usb_anchor(&data->tx_anchor);
 476         init_usb_anchor(&data->rx_anchor);
 477
 478         hdev = hci_alloc_dev();
 479         if (!hdev) {
 480                 kfree(data);
 481                 return -ENOMEM;
 482         }
 483
 484         hdev->type = HCI_USB;
 485         hdev->driver_data = data;
 486
 487         data->hdev = hdev;
 488
 489         SET_HCIDEV_DEV(hdev, &intf->dev);
 490
 491         hdev->open     = bpa10x_open;
 492         hdev->close    = bpa10x_close;
 493         hdev->flush    = bpa10x_flush;
 494         hdev->send     = bpa10x_send_frame;
 495         hdev->destruct = bpa10x_destruct;
 496
 497         hdev->owner = THIS_MODULE;
 498
 499         err = hci_register_dev(hdev);
 500         if (err < 0) {
 501                 hci_free_dev(hdev);
 502                 kfree(data);
 503                 return err;
 504         }
 505
 506         usb_set_intfdata(intf, data);
 507
 508         return 0;
 509 }
 510
 511 static void bpa10x_disconnect(struct usb_interface *intf)
 512 {
 513         struct bpa10x_data *data = usb_get_intfdata(intf);
 514
 515         BT_DBG("intf %p", intf);
 516
 517         if (!data)
 518                 return;
 519
 520         usb_set_intfdata(intf, NULL);
 521
 522         hci_unregister_dev(data->hdev);
 523
 524         hci_free_dev(data->hdev);
 525 }
 526
 527 static struct usb_driver bpa10x_driver = {
 528         .name           = "bpa10x",
 529         .probe          = bpa10x_probe,
 530         .disconnect     = bpa10x_disconnect,
 531         .id_table       = bpa10x_table,
 532 };
 533
 534 static int __init bpa10x_init(void)
 535 {
 536         BT_INFO("Digianswer Bluetooth USB driver ver %s", VERSION);
 537
 538         return usb_register(&bpa10x_driver);
 539 }
 540
 541 static void __exit bpa10x_exit(void)
 542 {
 543         usb_deregister(&bpa10x_driver);
 544 }
 545
 546 module_init(bpa10x_init);
 547 module_exit(bpa10x_exit);
 548
 549 module_param(ignore, bool, 0644);
 550 MODULE_PARM_DESC(ignore, "Ignore devices from the matching table");
 551
 552 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 553 MODULE_DESCRIPTION("Digianswer Bluetooth USB driver ver " VERSION);
 554 MODULE_VERSION(VERSION);
 555 MODULE_LICENSE("GPL");