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                                 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                                 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                                 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                 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, size_t size, int flags, void *data)
 311 {
 312         struct urb *urb;
 313         struct usb_ctrlrequest *cr;
 314         unsigned char *buf;
 315
 316         BT_DBG("udev %p data %p", udev, data);
 317
 318         urb = usb_alloc_urb(0, flags);
 319         if (!urb)
 320                 return NULL;
 321
 322         buf = kmalloc(size, flags);
 323         if (!buf) {
 324                 usb_free_urb(urb);
 325                 return NULL;
 326         }
 327
 328         switch (usb_pipetype(pipe)) {
 329         case PIPE_CONTROL:
 330                 cr = kmalloc(sizeof(*cr), flags);
 331                 if (!cr) {
 332                         kfree(buf);
 333                         usb_free_urb(urb);
 334                         return NULL;
 335                 }
 336
 337                 cr->bRequestType = USB_TYPE_VENDOR;
 338                 cr->bRequest     = 0;
 339                 cr->wIndex       = 0;
 340                 cr->wValue       = 0;
 341                 cr->wLength      = __cpu_to_le16(0);
 342
 343                 usb_fill_control_urb(urb, udev, pipe, (void *) cr, buf, 0, bpa10x_complete, data);
 344                 break;
 345
 346         case PIPE_INTERRUPT:
 347                 usb_fill_int_urb(urb, udev, pipe, buf, size, bpa10x_complete, data, 1);
 348                 break;
 349
 350         case PIPE_BULK:
 351                 usb_fill_bulk_urb(urb, udev, pipe, buf, size, bpa10x_complete, data);
 352                 break;
 353
 354         default:
 355                 kfree(buf);
 356                 usb_free_urb(urb);
 357                 return NULL;
 358         }
 359
 360         return urb;
 361 }
 362
 363 static inline void bpa10x_free_urb(struct urb *urb)
 364 {
 365         BT_DBG("urb %p", urb);
 366
 367         if (!urb)
 368                 return;
 369
 370         kfree(urb->setup_packet);
 371         kfree(urb->transfer_buffer);
 372
 373         usb_free_urb(urb);
 374 }
 375
 376 static int bpa10x_open(struct hci_dev *hdev)
 377 {
 378         struct bpa10x_data *data = hdev->driver_data;
 379         struct usb_device *udev = data->udev;
 380         unsigned long flags;
 381         int err;
 382
 383         BT_DBG("hdev %p data %p", hdev, data);
 384
 385         if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
 386                 return 0;
 387
 388         data->cmd_urb = bpa10x_alloc_urb(udev, usb_sndctrlpipe(udev, BPA10X_CMD_EP),
 389                                         BPA10X_CMD_BUF_SIZE, GFP_KERNEL, data);
 390         if (!data->cmd_urb) {
 391                 err = -ENOMEM;
 392                 goto done;
 393         }
 394
 395         data->evt_urb = bpa10x_alloc_urb(udev, usb_rcvintpipe(udev, BPA10X_EVT_EP),
 396                                         BPA10X_EVT_BUF_SIZE, GFP_KERNEL, data);
 397         if (!data->evt_urb) {
 398                 bpa10x_free_urb(data->cmd_urb);
 399                 err = -ENOMEM;
 400                 goto done;
 401         }
 402
 403         data->rx_urb = bpa10x_alloc_urb(udev, usb_rcvbulkpipe(udev, BPA10X_RX_EP),
 404                                         BPA10X_RX_BUF_SIZE, GFP_KERNEL, data);
 405         if (!data->rx_urb) {
 406                 bpa10x_free_urb(data->evt_urb);
 407                 bpa10x_free_urb(data->cmd_urb);
 408                 err = -ENOMEM;
 409                 goto done;
 410         }
 411
 412         data->tx_urb = bpa10x_alloc_urb(udev, usb_sndbulkpipe(udev, BPA10X_TX_EP),
 413                                         BPA10X_TX_BUF_SIZE, GFP_KERNEL, data);
 414         if (!data->rx_urb) {
 415                 bpa10x_free_urb(data->rx_urb);
 416                 bpa10x_free_urb(data->evt_urb);
 417                 bpa10x_free_urb(data->cmd_urb);
 418                 err = -ENOMEM;
 419                 goto done;
 420         }
 421
 422         write_lock_irqsave(&data->lock, flags);
 423
 424         err = usb_submit_urb(data->evt_urb, GFP_ATOMIC);
 425         if (err < 0) {
 426                 BT_ERR("%s submit failed for event urb %p with error %d",
 427                                         data->hdev->name, data->evt_urb, err);
 428         } else {
 429                 err = usb_submit_urb(data->rx_urb, GFP_ATOMIC);
 430                 if (err < 0) {
 431                         BT_ERR("%s submit failed for rx urb %p with error %d",
 432                                         data->hdev->name, data->evt_urb, err);
 433                         usb_kill_urb(data->evt_urb);
 434                 }
 435         }
 436
 437         write_unlock_irqrestore(&data->lock, flags);
 438
 439 done:
 440         if (err < 0)
 441                 clear_bit(HCI_RUNNING, &hdev->flags);
 442
 443         return err;
 444 }
 445
 446 static int bpa10x_close(struct hci_dev *hdev)
 447 {
 448         struct bpa10x_data *data = hdev->driver_data;
 449         unsigned long flags;
 450
 451         BT_DBG("hdev %p data %p", hdev, data);
 452
 453         if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
 454                 return 0;
 455
 456         write_lock_irqsave(&data->lock, flags);
 457
 458         skb_queue_purge(&data->cmd_queue);
 459         usb_kill_urb(data->cmd_urb);
 460         usb_kill_urb(data->evt_urb);
 461         usb_kill_urb(data->rx_urb);
 462         usb_kill_urb(data->tx_urb);
 463
 464         write_unlock_irqrestore(&data->lock, flags);
 465
 466         bpa10x_free_urb(data->cmd_urb);
 467         bpa10x_free_urb(data->evt_urb);
 468         bpa10x_free_urb(data->rx_urb);
 469         bpa10x_free_urb(data->tx_urb);
 470
 471         return 0;
 472 }
 473
 474 static int bpa10x_flush(struct hci_dev *hdev)
 475 {
 476         struct bpa10x_data *data = hdev->driver_data;
 477
 478         BT_DBG("hdev %p data %p", hdev, data);
 479
 480         skb_queue_purge(&data->cmd_queue);
 481
 482         return 0;
 483 }
 484
 485 static int bpa10x_send_frame(struct sk_buff *skb)
 486 {
 487         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
 488         struct bpa10x_data *data;
 489
 490         BT_DBG("hdev %p skb %p type %d len %d", hdev, skb, skb->pkt_type, skb->len);
 491
 492         if (!hdev) {
 493                 BT_ERR("Frame for unknown HCI device");
 494                 return -ENODEV;
 495         }
 496
 497         if (!test_bit(HCI_RUNNING, &hdev->flags))
 498                 return -EBUSY;
 499
 500         data = hdev->driver_data;
 501
 502         /* Prepend skb with frame type */
 503         memcpy(skb_push(skb, 1), &(skb->pkt_type), 1);
 504
 505         switch (skb->pkt_type) {
 506         case HCI_COMMAND_PKT:
 507                 hdev->stat.cmd_tx++;
 508                 skb_queue_tail(&data->cmd_queue, skb);
 509                 break;
 510
 511         case HCI_ACLDATA_PKT:
 512                 hdev->stat.acl_tx++;
 513                 skb_queue_tail(&data->tx_queue, skb);
 514                 break;
 515
 516         case HCI_SCODATA_PKT:
 517                 hdev->stat.sco_tx++;
 518                 skb_queue_tail(&data->tx_queue, skb);
 519                 break;
 520         };
 521
 522         read_lock(&data->lock);
 523
 524         bpa10x_wakeup(data);
 525
 526         read_unlock(&data->lock);
 527
 528         return 0;
 529 }
 530
 531 static void bpa10x_destruct(struct hci_dev *hdev)
 532 {
 533         struct bpa10x_data *data = hdev->driver_data;
 534
 535         BT_DBG("hdev %p data %p", hdev, data);
 536
 537         kfree(data);
 538 }
 539
 540 static int bpa10x_probe(struct usb_interface *intf, const struct usb_device_id *id)
 541 {
 542         struct usb_device *udev = interface_to_usbdev(intf);
 543         struct hci_dev *hdev;
 544         struct bpa10x_data *data;
 545         int err;
 546
 547         BT_DBG("intf %p id %p", intf, id);
 548
 549         if (ignore)
 550                 return -ENODEV;
 551
 552         data = kmalloc(sizeof(*data), GFP_KERNEL);
 553         if (!data) {
 554                 BT_ERR("Can't allocate data structure");
 555                 return -ENOMEM;
 556         }
 557
 558         memset(data, 0, sizeof(*data));
 559
 560         data->udev = udev;
 561
 562         rwlock_init(&data->lock);
 563
 564         skb_queue_head_init(&data->cmd_queue);
 565         skb_queue_head_init(&data->tx_queue);
 566
 567         hdev = hci_alloc_dev();
 568         if (!hdev) {
 569                 BT_ERR("Can't allocate HCI device");
 570                 kfree(data);
 571                 return -ENOMEM;
 572         }
 573
 574         data->hdev = hdev;
 575
 576         hdev->type = HCI_USB;
 577         hdev->driver_data = data;
 578         SET_HCIDEV_DEV(hdev, &intf->dev);
 579
 580         hdev->open      = bpa10x_open;
 581         hdev->close     = bpa10x_close;
 582         hdev->flush     = bpa10x_flush;
 583         hdev->send      = bpa10x_send_frame;
 584         hdev->destruct  = bpa10x_destruct;
 585
 586         hdev->owner = THIS_MODULE;
 587
 588         err = hci_register_dev(hdev);
 589         if (err < 0) {
 590                 BT_ERR("Can't register HCI device");
 591                 kfree(data);
 592                 hci_free_dev(hdev);
 593                 return err;
 594         }
 595
 596         usb_set_intfdata(intf, data);
 597
 598         return 0;
 599 }
 600
 601 static void bpa10x_disconnect(struct usb_interface *intf)
 602 {
 603         struct bpa10x_data *data = usb_get_intfdata(intf);
 604         struct hci_dev *hdev = data->hdev;
 605
 606         BT_DBG("intf %p", intf);
 607
 608         if (!hdev)
 609                 return;
 610
 611         usb_set_intfdata(intf, NULL);
 612
 613         if (hci_unregister_dev(hdev) < 0)
 614                 BT_ERR("Can't unregister HCI device %s", hdev->name);
 615
 616         hci_free_dev(hdev);
 617 }
 618
 619 static struct usb_driver bpa10x_driver = {
 620         .owner          = THIS_MODULE,
 621         .name           = "bpa10x",
 622         .probe          = bpa10x_probe,
 623         .disconnect     = bpa10x_disconnect,
 624         .id_table       = bpa10x_table,
 625 };
 626
 627 static int __init bpa10x_init(void)
 628 {
 629         int err;
 630
 631         BT_INFO("Digianswer Bluetooth USB driver ver %s", VERSION);
 632
 633         err = usb_register(&bpa10x_driver);
 634         if (err < 0)
 635                 BT_ERR("Failed to register USB driver");
 636
 637         return err;
 638 }
 639
 640 static void __exit bpa10x_exit(void)
 641 {
 642         usb_deregister(&bpa10x_driver);
 643 }
 644
 645 module_init(bpa10x_init);
 646 module_exit(bpa10x_exit);
 647
 648 module_param(ignore, bool, 0644);
 649 MODULE_PARM_DESC(ignore, "Ignore devices from the matching table");
 650
 651 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 652 MODULE_DESCRIPTION("Digianswer Bluetooth USB driver ver " VERSION);
 653 MODULE_VERSION(VERSION);
 654 MODULE_LICENSE("GPL");