drivers/bluetooth/bpa10x.c

   1 /*
   2  *
   3  *  Digianswer Bluetooth USB driver
   4  *
   5  *  Copyright (C) 2004-2005  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/config.h>
  25 #include <linux/module.h>
  26
  27 #include <linux/kernel.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <linux/types.h>
  31 #include <linux/errno.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 "0.8"
  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 #define BPA10X_CMD_EP           0x00
  57 #define BPA10X_EVT_EP           0x81
  58 #define BPA10X_TX_EP            0x02
  59 #define BPA10X_RX_EP            0x82
  60
  61 #define BPA10X_CMD_BUF_SIZE     252
  62 #define BPA10X_EVT_BUF_SIZE     16
  63 #define BPA10X_TX_BUF_SIZE      384
  64 #define BPA10X_RX_BUF_SIZE      384
  65
  66 struct bpa10x_data {
  67         struct hci_dev          *hdev;
  68         struct usb_device       *udev;
  69
  70         rwlock_t                lock;
  71
  72         struct sk_buff_head     cmd_queue;
  73         struct urb              *cmd_urb;
  74         struct urb              *evt_urb;
  75         struct sk_buff          *evt_skb;
  76         unsigned int            evt_len;
  77
  78         struct sk_buff_head     tx_queue;
  79         struct urb              *tx_urb;
  80         struct urb              *rx_urb;
  81 };
  82
  83 #define HCI_VENDOR_HDR_SIZE     5
  84
  85 struct hci_vendor_hdr {
  86         __u8    type;
  87         __u16   snum;
  88         __u16   dlen;
  89 } __attribute__ ((packed));
  90
  91 static void bpa10x_recv_bulk(struct bpa10x_data *data, unsigned char *buf, int count)
  92 {
  93         struct hci_acl_hdr *ah;
  94         struct hci_sco_hdr *sh;
  95         struct hci_vendor_hdr *vh;
  96         struct sk_buff *skb;
  97         int len;
  98
  99         while (count) {
 100                 switch (*buf++) {
 101                 case HCI_ACLDATA_PKT:
 102                         ah = (struct hci_acl_hdr *) buf;
 103                         len = HCI_ACL_HDR_SIZE + __le16_to_cpu(ah->dlen);
 104                         skb = bt_skb_alloc(len, GFP_ATOMIC);
 105                         if (skb) {
 106                                 memcpy(skb_put(skb, len), buf, len);
 107                                 skb->dev = (void *) data->hdev;
 108                                 bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT;
 109                                 hci_recv_frame(skb);
 110                         }
 111                         break;
 112
 113                 case HCI_SCODATA_PKT:
 114                         sh = (struct hci_sco_hdr *) buf;
 115                         len = HCI_SCO_HDR_SIZE + sh->dlen;
 116                         skb = bt_skb_alloc(len, GFP_ATOMIC);
 117                         if (skb) {
 118                                 memcpy(skb_put(skb, len), buf, len);
 119                                 skb->dev = (void *) data->hdev;
 120                                 bt_cb(skb)->pkt_type = HCI_SCODATA_PKT;
 121                                 hci_recv_frame(skb);
 122                         }
 123                         break;
 124
 125                 case HCI_VENDOR_PKT:
 126                         vh = (struct hci_vendor_hdr *) buf;
 127                         len = HCI_VENDOR_HDR_SIZE + __le16_to_cpu(vh->dlen);
 128                         skb = bt_skb_alloc(len, GFP_ATOMIC);
 129                         if (skb) {
 130                                 memcpy(skb_put(skb, len), buf, len);
 131                                 skb->dev = (void *) data->hdev;
 132                                 bt_cb(skb)->pkt_type = HCI_VENDOR_PKT;
 133                                 hci_recv_frame(skb);
 134                         }
 135                         break;
 136
 137                 default:
 138                         len = count - 1;
 139                         break;
 140                 }
 141
 142                 buf   += len;
 143                 count -= (len + 1);
 144         }
 145 }
 146
 147 static int bpa10x_recv_event(struct bpa10x_data *data, unsigned char *buf, int size)
 148 {
 149         BT_DBG("data %p buf %p size %d", data, buf, size);
 150
 151         if (data->evt_skb) {
 152                 struct sk_buff *skb = data->evt_skb;
 153
 154                 memcpy(skb_put(skb, size), buf, size);
 155
 156                 if (skb->len == data->evt_len) {
 157                         data->evt_skb = NULL;
 158                         data->evt_len = 0;
 159                         hci_recv_frame(skb);
 160                 }
 161         } else {
 162                 struct sk_buff *skb;
 163                 struct hci_event_hdr *hdr;
 164                 unsigned char pkt_type;
 165                 int pkt_len = 0;
 166
 167                 if (size < HCI_EVENT_HDR_SIZE + 1) {
 168                         BT_ERR("%s event packet block with size %d is too short",
 169                                                         data->hdev->name, size);
 170                         return -EILSEQ;
 171                 }
 172
 173                 pkt_type = *buf++;
 174                 size--;
 175
 176                 if (pkt_type != HCI_EVENT_PKT) {
 177                         BT_ERR("%s unexpected event packet start byte 0x%02x",
 178                                                         data->hdev->name, pkt_type);
 179                         return -EPROTO;
 180                 }
 181
 182                 hdr = (struct hci_event_hdr *) buf;
 183                 pkt_len = HCI_EVENT_HDR_SIZE + hdr->plen;
 184
 185                 skb = bt_skb_alloc(pkt_len, GFP_ATOMIC);
 186                 if (!skb) {
 187                         BT_ERR("%s no memory for new event packet",
 188                                                         data->hdev->name);
 189                         return -ENOMEM;
 190                 }
 191
 192                 skb->dev = (void *) data->hdev;
 193                 bt_cb(skb)->pkt_type = pkt_type;
 194
 195                 memcpy(skb_put(skb, size), buf, size);
 196
 197                 if (pkt_len == size) {
 198                         hci_recv_frame(skb);
 199                 } else {
 200                         data->evt_skb = skb;
 201                         data->evt_len = pkt_len;
 202                 }
 203         }
 204
 205         return 0;
 206 }
 207
 208 static void bpa10x_wakeup(struct bpa10x_data *data)
 209 {
 210         struct urb *urb;
 211         struct sk_buff *skb;
 212         int err;
 213
 214         BT_DBG("data %p", data);
 215
 216         urb = data->cmd_urb;
 217         if (urb->status == -EINPROGRESS)
 218                 skb = NULL;
 219         else
 220                 skb = skb_dequeue(&data->cmd_queue);
 221
 222         if (skb) {
 223                 struct usb_ctrlrequest *cr;
 224
 225                 if (skb->len > BPA10X_CMD_BUF_SIZE) {
 226                         BT_ERR("%s command packet with size %d is too big",
 227                                                         data->hdev->name, skb->len);
 228                         kfree_skb(skb);
 229                         return;
 230                 }
 231
 232                 cr = (struct usb_ctrlrequest *) urb->setup_packet;
 233                 cr->wLength = __cpu_to_le16(skb->len);
 234
 235                 memcpy(urb->transfer_buffer, skb->data, skb->len);
 236                 urb->transfer_buffer_length = skb->len;
 237
 238                 err = usb_submit_urb(urb, GFP_ATOMIC);
 239                 if (err < 0 && err != -ENODEV) {
 240                         BT_ERR("%s submit failed for command urb %p with error %d",
 241                                                         data->hdev->name, urb, err);
 242                         skb_queue_head(&data->cmd_queue, skb);
 243                 } else
 244                         kfree_skb(skb);
 245         }
 246
 247         urb = data->tx_urb;
 248         if (urb->status == -EINPROGRESS)
 249                 skb = NULL;
 250         else
 251                 skb = skb_dequeue(&data->tx_queue);
 252
 253         if (skb) {
 254                 memcpy(urb->transfer_buffer, skb->data, skb->len);
 255                 urb->transfer_buffer_length = skb->len;
 256
 257                 err = usb_submit_urb(urb, GFP_ATOMIC);
 258                 if (err < 0 && err != -ENODEV) {
 259                         BT_ERR("%s submit failed for command urb %p with error %d",
 260                                                         data->hdev->name, urb, err);
 261                         skb_queue_head(&data->tx_queue, skb);
 262                 } else
 263                         kfree_skb(skb);
 264         }
 265 }
 266
 267 static void bpa10x_complete(struct urb *urb, struct pt_regs *regs)
 268 {
 269         struct bpa10x_data *data = urb->context;
 270         unsigned char *buf = urb->transfer_buffer;
 271         int err, count = urb->actual_length;
 272
 273         BT_DBG("data %p urb %p buf %p count %d", data, urb, buf, count);
 274
 275         read_lock(&data->lock);
 276
 277         if (!test_bit(HCI_RUNNING, &data->hdev->flags))
 278                 goto unlock;
 279
 280         if (urb->status < 0 || !count)
 281                 goto resubmit;
 282
 283         if (usb_pipein(urb->pipe)) {
 284                 data->hdev->stat.byte_rx += count;
 285
 286                 if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)
 287                         bpa10x_recv_event(data, buf, count);
 288
 289                 if (usb_pipetype(urb->pipe) == PIPE_BULK)
 290                         bpa10x_recv_bulk(data, buf, count);
 291         } else {
 292                 data->hdev->stat.byte_tx += count;
 293
 294                 bpa10x_wakeup(data);
 295         }
 296
 297 resubmit:
 298         if (usb_pipein(urb->pipe)) {
 299                 err = usb_submit_urb(urb, GFP_ATOMIC);
 300                 if (err < 0 && err != -ENODEV) {
 301                         BT_ERR("%s urb %p type %d resubmit status %d",
 302                                 data->hdev->name, urb, usb_pipetype(urb->pipe), err);
 303                 }
 304         }
 305
 306 unlock:
 307         read_unlock(&data->lock);
 308 }
 309
 310 static inline struct urb *bpa10x_alloc_urb(struct usb_device *udev, unsigned int pipe,
 311                                         size_t size, gfp_t flags, void *data)
 312 {
 313         struct urb *urb;
 314         struct usb_ctrlrequest *cr;
 315         unsigned char *buf;
 316
 317         BT_DBG("udev %p data %p", udev, data);
 318
 319         urb = usb_alloc_urb(0, flags);
 320         if (!urb)
 321                 return NULL;
 322
 323         buf = kmalloc(size, flags);
 324         if (!buf) {
 325                 usb_free_urb(urb);
 326                 return NULL;
 327         }
 328
 329         switch (usb_pipetype(pipe)) {
 330         case PIPE_CONTROL:
 331                 cr = kmalloc(sizeof(*cr), flags);
 332                 if (!cr) {
 333                         kfree(buf);
 334                         usb_free_urb(urb);
 335                         return NULL;
 336                 }
 337
 338                 cr->bRequestType = USB_TYPE_VENDOR;
 339                 cr->bRequest     = 0;
 340                 cr->wIndex       = 0;
 341                 cr->wValue       = 0;
 342                 cr->wLength      = __cpu_to_le16(0);
 343
 344                 usb_fill_control_urb(urb, udev, pipe, (void *) cr, buf, 0, bpa10x_complete, data);
 345                 break;
 346
 347         case PIPE_INTERRUPT:
 348                 usb_fill_int_urb(urb, udev, pipe, buf, size, bpa10x_complete, data, 1);
 349                 break;
 350
 351         case PIPE_BULK:
 352                 usb_fill_bulk_urb(urb, udev, pipe, buf, size, bpa10x_complete, data);
 353                 break;
 354
 355         default:
 356                 kfree(buf);
 357                 usb_free_urb(urb);
 358                 return NULL;
 359         }
 360
 361         return urb;
 362 }
 363
 364 static inline void bpa10x_free_urb(struct urb *urb)
 365 {
 366         BT_DBG("urb %p", urb);
 367
 368         if (!urb)
 369                 return;
 370
 371         kfree(urb->setup_packet);
 372         kfree(urb->transfer_buffer);
 373
 374         usb_free_urb(urb);
 375 }
 376
 377 static int bpa10x_open(struct hci_dev *hdev)
 378 {
 379         struct bpa10x_data *data = hdev->driver_data;
 380         struct usb_device *udev = data->udev;
 381         unsigned long flags;
 382         int err;
 383
 384         BT_DBG("hdev %p data %p", hdev, data);
 385
 386         if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
 387                 return 0;
 388
 389         data->cmd_urb = bpa10x_alloc_urb(udev, usb_sndctrlpipe(udev, BPA10X_CMD_EP),
 390                                         BPA10X_CMD_BUF_SIZE, GFP_KERNEL, data);
 391         if (!data->cmd_urb) {
 392                 err = -ENOMEM;
 393                 goto done;
 394         }
 395
 396         data->evt_urb = bpa10x_alloc_urb(udev, usb_rcvintpipe(udev, BPA10X_EVT_EP),
 397                                         BPA10X_EVT_BUF_SIZE, GFP_KERNEL, data);
 398         if (!data->evt_urb) {
 399                 bpa10x_free_urb(data->cmd_urb);
 400                 err = -ENOMEM;
 401                 goto done;
 402         }
 403
 404         data->rx_urb = bpa10x_alloc_urb(udev, usb_rcvbulkpipe(udev, BPA10X_RX_EP),
 405                                         BPA10X_RX_BUF_SIZE, GFP_KERNEL, data);
 406         if (!data->rx_urb) {
 407                 bpa10x_free_urb(data->evt_urb);
 408                 bpa10x_free_urb(data->cmd_urb);
 409                 err = -ENOMEM;
 410                 goto done;
 411         }
 412
 413         data->tx_urb = bpa10x_alloc_urb(udev, usb_sndbulkpipe(udev, BPA10X_TX_EP),
 414                                         BPA10X_TX_BUF_SIZE, GFP_KERNEL, data);
 415         if (!data->rx_urb) {
 416                 bpa10x_free_urb(data->rx_urb);
 417                 bpa10x_free_urb(data->evt_urb);
 418                 bpa10x_free_urb(data->cmd_urb);
 419                 err = -ENOMEM;
 420                 goto done;
 421         }
 422
 423         write_lock_irqsave(&data->lock, flags);
 424
 425         err = usb_submit_urb(data->evt_urb, GFP_ATOMIC);
 426         if (err < 0) {
 427                 BT_ERR("%s submit failed for event urb %p with error %d",
 428                                         data->hdev->name, data->evt_urb, err);
 429         } else {
 430                 err = usb_submit_urb(data->rx_urb, GFP_ATOMIC);
 431                 if (err < 0) {
 432                         BT_ERR("%s submit failed for rx urb %p with error %d",
 433                                         data->hdev->name, data->evt_urb, err);
 434                         usb_kill_urb(data->evt_urb);
 435                 }
 436         }
 437
 438         write_unlock_irqrestore(&data->lock, flags);
 439
 440 done:
 441         if (err < 0)
 442                 clear_bit(HCI_RUNNING, &hdev->flags);
 443
 444         return err;
 445 }
 446
 447 static int bpa10x_close(struct hci_dev *hdev)
 448 {
 449         struct bpa10x_data *data = hdev->driver_data;
 450         unsigned long flags;
 451
 452         BT_DBG("hdev %p data %p", hdev, data);
 453
 454         if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
 455                 return 0;
 456
 457         write_lock_irqsave(&data->lock, flags);
 458
 459         skb_queue_purge(&data->cmd_queue);
 460         usb_kill_urb(data->cmd_urb);
 461         usb_kill_urb(data->evt_urb);
 462         usb_kill_urb(data->rx_urb);
 463         usb_kill_urb(data->tx_urb);
 464
 465         write_unlock_irqrestore(&data->lock, flags);
 466
 467         bpa10x_free_urb(data->cmd_urb);
 468         bpa10x_free_urb(data->evt_urb);
 469         bpa10x_free_urb(data->rx_urb);
 470         bpa10x_free_urb(data->tx_urb);
 471
 472         return 0;
 473 }
 474
 475 static int bpa10x_flush(struct hci_dev *hdev)
 476 {
 477         struct bpa10x_data *data = hdev->driver_data;
 478
 479         BT_DBG("hdev %p data %p", hdev, data);
 480
 481         skb_queue_purge(&data->cmd_queue);
 482
 483         return 0;
 484 }
 485
 486 static int bpa10x_send_frame(struct sk_buff *skb)
 487 {
 488         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
 489         struct bpa10x_data *data;
 490
 491         BT_DBG("hdev %p skb %p type %d len %d", hdev, skb, bt_cb(skb)->pkt_type, skb->len);
 492
 493         if (!hdev) {
 494                 BT_ERR("Frame for unknown HCI device");
 495                 return -ENODEV;
 496         }
 497
 498         if (!test_bit(HCI_RUNNING, &hdev->flags))
 499                 return -EBUSY;
 500
 501         data = hdev->driver_data;
 502
 503         /* Prepend skb with frame type */
 504         memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
 505
 506         switch (bt_cb(skb)->pkt_type) {
 507         case HCI_COMMAND_PKT:
 508                 hdev->stat.cmd_tx++;
 509                 skb_queue_tail(&data->cmd_queue, skb);
 510                 break;
 511
 512         case HCI_ACLDATA_PKT:
 513                 hdev->stat.acl_tx++;
 514                 skb_queue_tail(&data->tx_queue, skb);
 515                 break;
 516
 517         case HCI_SCODATA_PKT:
 518                 hdev->stat.sco_tx++;
 519                 skb_queue_tail(&data->tx_queue, skb);
 520                 break;
 521         };
 522
 523         read_lock(&data->lock);
 524
 525         bpa10x_wakeup(data);
 526
 527         read_unlock(&data->lock);
 528
 529         return 0;
 530 }
 531
 532 static void bpa10x_destruct(struct hci_dev *hdev)
 533 {
 534         struct bpa10x_data *data = hdev->driver_data;
 535
 536         BT_DBG("hdev %p data %p", hdev, data);
 537
 538         kfree(data);
 539 }
 540
 541 static int bpa10x_probe(struct usb_interface *intf, const struct usb_device_id *id)
 542 {
 543         struct usb_device *udev = interface_to_usbdev(intf);
 544         struct hci_dev *hdev;
 545         struct bpa10x_data *data;
 546         int err;
 547
 548         BT_DBG("intf %p id %p", intf, id);
 549
 550         if (ignore)
 551                 return -ENODEV;
 552
 553         data = kmalloc(sizeof(*data), GFP_KERNEL);
 554         if (!data) {
 555                 BT_ERR("Can't allocate data structure");
 556                 return -ENOMEM;
 557         }
 558
 559         memset(data, 0, sizeof(*data));
 560
 561         data->udev = udev;
 562
 563         rwlock_init(&data->lock);
 564
 565         skb_queue_head_init(&data->cmd_queue);
 566         skb_queue_head_init(&data->tx_queue);
 567
 568         hdev = hci_alloc_dev();
 569         if (!hdev) {
 570                 BT_ERR("Can't allocate HCI device");
 571                 kfree(data);
 572                 return -ENOMEM;
 573         }
 574
 575         data->hdev = hdev;
 576
 577         hdev->type = HCI_USB;
 578         hdev->driver_data = data;
 579         SET_HCIDEV_DEV(hdev, &intf->dev);
 580
 581         hdev->open      = bpa10x_open;
 582         hdev->close     = bpa10x_close;
 583         hdev->flush     = bpa10x_flush;
 584         hdev->send      = bpa10x_send_frame;
 585         hdev->destruct  = bpa10x_destruct;
 586
 587         hdev->owner = THIS_MODULE;
 588
 589         err = hci_register_dev(hdev);
 590         if (err < 0) {
 591                 BT_ERR("Can't register HCI device");
 592                 kfree(data);
 593                 hci_free_dev(hdev);
 594                 return err;
 595         }
 596
 597         usb_set_intfdata(intf, data);
 598
 599         return 0;
 600 }
 601
 602 static void bpa10x_disconnect(struct usb_interface *intf)
 603 {
 604         struct bpa10x_data *data = usb_get_intfdata(intf);
 605         struct hci_dev *hdev = data->hdev;
 606
 607         BT_DBG("intf %p", intf);
 608
 609         if (!hdev)
 610                 return;
 611
 612         usb_set_intfdata(intf, NULL);
 613
 614         if (hci_unregister_dev(hdev) < 0)
 615                 BT_ERR("Can't unregister HCI device %s", hdev->name);
 616
 617         hci_free_dev(hdev);
 618 }
 619
 620 static struct usb_driver bpa10x_driver = {
 621         .owner          = THIS_MODULE,
 622         .name           = "bpa10x",
 623         .probe          = bpa10x_probe,
 624         .disconnect     = bpa10x_disconnect,
 625         .id_table       = bpa10x_table,
 626 };
 627
 628 static int __init bpa10x_init(void)
 629 {
 630         int err;
 631
 632         BT_INFO("Digianswer Bluetooth USB driver ver %s", VERSION);
 633
 634         err = usb_register(&bpa10x_driver);
 635         if (err < 0)
 636                 BT_ERR("Failed to register USB driver");
 637
 638         return err;
 639 }
 640
 641 static void __exit bpa10x_exit(void)
 642 {
 643         usb_deregister(&bpa10x_driver);
 644 }
 645
 646 module_init(bpa10x_init);
 647 module_exit(bpa10x_exit);
 648
 649 module_param(ignore, bool, 0644);
 650 MODULE_PARM_DESC(ignore, "Ignore devices from the matching table");
 651
 652 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 653 MODULE_DESCRIPTION("Digianswer Bluetooth USB driver ver " VERSION);
 654 MODULE_VERSION(VERSION);
 655 MODULE_LICENSE("GPL");