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 #define VERSION "0.10"
  39
  40 static struct usb_device_id bpa10x_table[] = {
  41         /* Tektronix BPA 100/105 (Digianswer) */
  42         { USB_DEVICE(0x08fd, 0x0002) },
  43
  44         { }     /* Terminating entry */
  45 };
  46
  47 MODULE_DEVICE_TABLE(usb, bpa10x_table);
  48
  49 struct bpa10x_data {
  50         struct hci_dev    *hdev;
  51         struct usb_device *udev;
  52
  53         struct usb_anchor tx_anchor;
  54         struct usb_anchor rx_anchor;
  55
  56         struct sk_buff *rx_skb[2];
  57 };
  58
  59 #define HCI_VENDOR_HDR_SIZE 5
  60
  61 struct hci_vendor_hdr {
  62         __u8    type;
  63         __le16  snum;
  64         __le16  dlen;
  65 } __packed;
  66
  67 static int bpa10x_recv(struct hci_dev *hdev, int queue, void *buf, int count)
  68 {
  69         struct bpa10x_data *data = hci_get_drvdata(hdev);
  70
  71         BT_DBG("%s queue %d buffer %p count %d", hdev->name,
  72                                                         queue, buf, count);
  73
  74         if (queue < 0 || queue > 1)
  75                 return -EILSEQ;
  76
  77         hdev->stat.byte_rx += count;
  78
  79         while (count) {
  80                 struct sk_buff *skb = data->rx_skb[queue];
  81                 struct { __u8 type; int expect; } *scb;
  82                 int type, len = 0;
  83
  84                 if (!skb) {
  85                         /* Start of the frame */
  86
  87                         type = *((__u8 *) buf);
  88                         count--; buf++;
  89
  90                         switch (type) {
  91                         case HCI_EVENT_PKT:
  92                                 if (count >= HCI_EVENT_HDR_SIZE) {
  93                                         struct hci_event_hdr *h = buf;
  94                                         len = HCI_EVENT_HDR_SIZE + h->plen;
  95                                 } else
  96                                         return -EILSEQ;
  97                                 break;
  98
  99                         case HCI_ACLDATA_PKT:
 100                                 if (count >= HCI_ACL_HDR_SIZE) {
 101                                         struct hci_acl_hdr *h = buf;
 102                                         len = HCI_ACL_HDR_SIZE +
 103                                                         __le16_to_cpu(h->dlen);
 104                                 } else
 105                                         return -EILSEQ;
 106                                 break;
 107
 108                         case HCI_SCODATA_PKT:
 109                                 if (count >= HCI_SCO_HDR_SIZE) {
 110                                         struct hci_sco_hdr *h = buf;
 111                                         len = HCI_SCO_HDR_SIZE + h->dlen;
 112                                 } else
 113                                         return -EILSEQ;
 114                                 break;
 115
 116                         case HCI_VENDOR_PKT:
 117                                 if (count >= HCI_VENDOR_HDR_SIZE) {
 118                                         struct hci_vendor_hdr *h = buf;
 119                                         len = HCI_VENDOR_HDR_SIZE +
 120                                                         __le16_to_cpu(h->dlen);
 121                                 } else
 122                                         return -EILSEQ;
 123                                 break;
 124                         }
 125
 126                         skb = bt_skb_alloc(len, GFP_ATOMIC);
 127                         if (!skb) {
 128                                 BT_ERR("%s no memory for packet", hdev->name);
 129                                 return -ENOMEM;
 130                         }
 131
 132                         skb->dev = (void *) hdev;
 133
 134                         data->rx_skb[queue] = skb;
 135
 136                         scb = (void *) skb->cb;
 137                         scb->type = type;
 138                         scb->expect = len;
 139                 } else {
 140                         /* Continuation */
 141
 142                         scb = (void *) skb->cb;
 143                         len = scb->expect;
 144                 }
 145
 146                 len = min(len, count);
 147
 148                 memcpy(skb_put(skb, len), buf, len);
 149
 150                 scb->expect -= len;
 151
 152                 if (scb->expect == 0) {
 153                         /* Complete frame */
 154
 155                         data->rx_skb[queue] = NULL;
 156
 157                         bt_cb(skb)->pkt_type = scb->type;
 158                         hci_recv_frame(skb);
 159                 }
 160
 161                 count -= len; buf += len;
 162         }
 163
 164         return 0;
 165 }
 166
 167 static void bpa10x_tx_complete(struct urb *urb)
 168 {
 169         struct sk_buff *skb = urb->context;
 170         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
 171
 172         BT_DBG("%s urb %p status %d count %d", hdev->name,
 173                                         urb, urb->status, urb->actual_length);
 174
 175         if (!test_bit(HCI_RUNNING, &hdev->flags))
 176                 goto done;
 177
 178         if (!urb->status)
 179                 hdev->stat.byte_tx += urb->transfer_buffer_length;
 180         else
 181                 hdev->stat.err_tx++;
 182
 183 done:
 184         kfree(urb->setup_packet);
 185
 186         kfree_skb(skb);
 187 }
 188
 189 static void bpa10x_rx_complete(struct urb *urb)
 190 {
 191         struct hci_dev *hdev = urb->context;
 192         struct bpa10x_data *data = hci_get_drvdata(hdev);
 193         int err;
 194
 195         BT_DBG("%s urb %p status %d count %d", hdev->name,
 196                                         urb, urb->status, urb->actual_length);
 197
 198         if (!test_bit(HCI_RUNNING, &hdev->flags))
 199                 return;
 200
 201         if (urb->status == 0) {
 202                 if (bpa10x_recv(hdev, usb_pipebulk(urb->pipe),
 203                                                 urb->transfer_buffer,
 204                                                 urb->actual_length) < 0) {
 205                         BT_ERR("%s corrupted event packet", hdev->name);
 206                         hdev->stat.err_rx++;
 207                 }
 208         }
 209
 210         usb_anchor_urb(urb, &data->rx_anchor);
 211
 212         err = usb_submit_urb(urb, GFP_ATOMIC);
 213         if (err < 0) {
 214                 BT_ERR("%s urb %p failed to resubmit (%d)",
 215                                                 hdev->name, urb, -err);
 216                 usb_unanchor_urb(urb);
 217         }
 218 }
 219
 220 static inline int bpa10x_submit_intr_urb(struct hci_dev *hdev)
 221 {
 222         struct bpa10x_data *data = hci_get_drvdata(hdev);
 223         struct urb *urb;
 224         unsigned char *buf;
 225         unsigned int pipe;
 226         int err, size = 16;
 227
 228         BT_DBG("%s", hdev->name);
 229
 230         urb = usb_alloc_urb(0, GFP_KERNEL);
 231         if (!urb)
 232                 return -ENOMEM;
 233
 234         buf = kmalloc(size, GFP_KERNEL);
 235         if (!buf) {
 236                 usb_free_urb(urb);
 237                 return -ENOMEM;
 238         }
 239
 240         pipe = usb_rcvintpipe(data->udev, 0x81);
 241
 242         usb_fill_int_urb(urb, data->udev, pipe, buf, size,
 243                                                 bpa10x_rx_complete, hdev, 1);
 244
 245         urb->transfer_flags |= URB_FREE_BUFFER;
 246
 247         usb_anchor_urb(urb, &data->rx_anchor);
 248
 249         err = usb_submit_urb(urb, GFP_KERNEL);
 250         if (err < 0) {
 251                 BT_ERR("%s urb %p submission failed (%d)",
 252                                                 hdev->name, urb, -err);
 253                 usb_unanchor_urb(urb);
 254         }
 255
 256         usb_free_urb(urb);
 257
 258         return err;
 259 }
 260
 261 static inline int bpa10x_submit_bulk_urb(struct hci_dev *hdev)
 262 {
 263         struct bpa10x_data *data = hci_get_drvdata(hdev);
 264         struct urb *urb;
 265         unsigned char *buf;
 266         unsigned int pipe;
 267         int err, size = 64;
 268
 269         BT_DBG("%s", hdev->name);
 270
 271         urb = usb_alloc_urb(0, GFP_KERNEL);
 272         if (!urb)
 273                 return -ENOMEM;
 274
 275         buf = kmalloc(size, GFP_KERNEL);
 276         if (!buf) {
 277                 usb_free_urb(urb);
 278                 return -ENOMEM;
 279         }
 280
 281         pipe = usb_rcvbulkpipe(data->udev, 0x82);
 282
 283         usb_fill_bulk_urb(urb, data->udev, pipe,
 284                                         buf, size, bpa10x_rx_complete, hdev);
 285
 286         urb->transfer_flags |= URB_FREE_BUFFER;
 287
 288         usb_anchor_urb(urb, &data->rx_anchor);
 289
 290         err = usb_submit_urb(urb, GFP_KERNEL);
 291         if (err < 0) {
 292                 BT_ERR("%s urb %p submission failed (%d)",
 293                                                 hdev->name, urb, -err);
 294                 usb_unanchor_urb(urb);
 295         }
 296
 297         usb_free_urb(urb);
 298
 299         return err;
 300 }
 301
 302 static int bpa10x_open(struct hci_dev *hdev)
 303 {
 304         struct bpa10x_data *data = hci_get_drvdata(hdev);
 305         int err;
 306
 307         BT_DBG("%s", hdev->name);
 308
 309         if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
 310                 return 0;
 311
 312         err = bpa10x_submit_intr_urb(hdev);
 313         if (err < 0)
 314                 goto error;
 315
 316         err = bpa10x_submit_bulk_urb(hdev);
 317         if (err < 0)
 318                 goto error;
 319
 320         return 0;
 321
 322 error:
 323         usb_kill_anchored_urbs(&data->rx_anchor);
 324
 325         clear_bit(HCI_RUNNING, &hdev->flags);
 326
 327         return err;
 328 }
 329
 330 static int bpa10x_close(struct hci_dev *hdev)
 331 {
 332         struct bpa10x_data *data = hci_get_drvdata(hdev);
 333
 334         BT_DBG("%s", hdev->name);
 335
 336         if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
 337                 return 0;
 338
 339         usb_kill_anchored_urbs(&data->rx_anchor);
 340
 341         return 0;
 342 }
 343
 344 static int bpa10x_flush(struct hci_dev *hdev)
 345 {
 346         struct bpa10x_data *data = hci_get_drvdata(hdev);
 347
 348         BT_DBG("%s", hdev->name);
 349
 350         usb_kill_anchored_urbs(&data->tx_anchor);
 351
 352         return 0;
 353 }
 354
 355 static int bpa10x_send_frame(struct sk_buff *skb)
 356 {
 357         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
 358         struct bpa10x_data *data = hci_get_drvdata(hdev);
 359         struct usb_ctrlrequest *dr;
 360         struct urb *urb;
 361         unsigned int pipe;
 362         int err;
 363
 364         BT_DBG("%s", hdev->name);
 365
 366         if (!test_bit(HCI_RUNNING, &hdev->flags))
 367                 return -EBUSY;
 368
 369         urb = usb_alloc_urb(0, GFP_ATOMIC);
 370         if (!urb)
 371                 return -ENOMEM;
 372
 373         /* Prepend skb with frame type */
 374         *skb_push(skb, 1) = bt_cb(skb)->pkt_type;
 375
 376         switch (bt_cb(skb)->pkt_type) {
 377         case HCI_COMMAND_PKT:
 378                 dr = kmalloc(sizeof(*dr), GFP_ATOMIC);
 379                 if (!dr) {
 380                         usb_free_urb(urb);
 381                         return -ENOMEM;
 382                 }
 383
 384                 dr->bRequestType = USB_TYPE_VENDOR;
 385                 dr->bRequest     = 0;
 386                 dr->wIndex       = 0;
 387                 dr->wValue       = 0;
 388                 dr->wLength      = __cpu_to_le16(skb->len);
 389
 390                 pipe = usb_sndctrlpipe(data->udev, 0x00);
 391
 392                 usb_fill_control_urb(urb, data->udev, pipe, (void *) dr,
 393                                 skb->data, skb->len, bpa10x_tx_complete, skb);
 394
 395                 hdev->stat.cmd_tx++;
 396                 break;
 397
 398         case HCI_ACLDATA_PKT:
 399                 pipe = usb_sndbulkpipe(data->udev, 0x02);
 400
 401                 usb_fill_bulk_urb(urb, data->udev, pipe,
 402                                 skb->data, skb->len, bpa10x_tx_complete, skb);
 403
 404                 hdev->stat.acl_tx++;
 405                 break;
 406
 407         case HCI_SCODATA_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.sco_tx++;
 414                 break;
 415
 416         default:
 417                 usb_free_urb(urb);
 418                 return -EILSEQ;
 419         }
 420
 421         usb_anchor_urb(urb, &data->tx_anchor);
 422
 423         err = usb_submit_urb(urb, GFP_ATOMIC);
 424         if (err < 0) {
 425                 BT_ERR("%s urb %p submission failed", hdev->name, urb);
 426                 kfree(urb->setup_packet);
 427                 usb_unanchor_urb(urb);
 428         }
 429
 430         usb_free_urb(urb);
 431
 432         return 0;
 433 }
 434
 435 static int bpa10x_probe(struct usb_interface *intf, const struct usb_device_id *id)
 436 {
 437         struct bpa10x_data *data;
 438         struct hci_dev *hdev;
 439         int err;
 440
 441         BT_DBG("intf %p id %p", intf, id);
 442
 443         if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
 444                 return -ENODEV;
 445
 446         data = devm_kzalloc(&intf->dev, sizeof(*data), GFP_KERNEL);
 447         if (!data)
 448                 return -ENOMEM;
 449
 450         data->udev = interface_to_usbdev(intf);
 451
 452         init_usb_anchor(&data->tx_anchor);
 453         init_usb_anchor(&data->rx_anchor);
 454
 455         hdev = hci_alloc_dev();
 456         if (!hdev)
 457                 return -ENOMEM;
 458
 459         hdev->bus = HCI_USB;
 460         hci_set_drvdata(hdev, data);
 461
 462         data->hdev = hdev;
 463
 464         SET_HCIDEV_DEV(hdev, &intf->dev);
 465
 466         hdev->open     = bpa10x_open;
 467         hdev->close    = bpa10x_close;
 468         hdev->flush    = bpa10x_flush;
 469         hdev->send     = bpa10x_send_frame;
 470
 471         set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 472
 473         err = hci_register_dev(hdev);
 474         if (err < 0) {
 475                 hci_free_dev(hdev);
 476                 return err;
 477         }
 478
 479         usb_set_intfdata(intf, data);
 480
 481         return 0;
 482 }
 483
 484 static void bpa10x_disconnect(struct usb_interface *intf)
 485 {
 486         struct bpa10x_data *data = usb_get_intfdata(intf);
 487
 488         BT_DBG("intf %p", intf);
 489
 490         if (!data)
 491                 return;
 492
 493         usb_set_intfdata(intf, NULL);
 494
 495         hci_unregister_dev(data->hdev);
 496
 497         hci_free_dev(data->hdev);
 498         kfree_skb(data->rx_skb[0]);
 499         kfree_skb(data->rx_skb[1]);
 500 }
 501
 502 static struct usb_driver bpa10x_driver = {
 503         .name           = "bpa10x",
 504         .probe          = bpa10x_probe,
 505         .disconnect     = bpa10x_disconnect,
 506         .id_table       = bpa10x_table,
 507         .disable_hub_initiated_lpm = 1,
 508 };
 509
 510 module_usb_driver(bpa10x_driver);
 511
 512 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 513 MODULE_DESCRIPTION("Digianswer Bluetooth USB driver ver " VERSION);
 514 MODULE_VERSION(VERSION);
 515 MODULE_LICENSE("GPL");