kernel/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 const 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                         data->rx_skb[queue] = skb;
 133
 134                         scb = (void *) skb->cb;
 135                         scb->type = type;
 136                         scb->expect = len;
 137                 } else {
 138                         /* Continuation */
 139
 140                         scb = (void *) skb->cb;
 141                         len = scb->expect;
 142                 }
 143
 144                 len = min(len, count);
 145
 146                 memcpy(skb_put(skb, len), buf, len);
 147
 148                 scb->expect -= len;
 149
 150                 if (scb->expect == 0) {
 151                         /* Complete frame */
 152
 153                         data->rx_skb[queue] = NULL;
 154
 155                         bt_cb(skb)->pkt_type = scb->type;
 156                         hci_recv_frame(hdev, skb);
 157                 }
 158
 159                 count -= len; buf += len;
 160         }
 161
 162         return 0;
 163 }
 164
 165 static void bpa10x_tx_complete(struct urb *urb)
 166 {
 167         struct sk_buff *skb = urb->context;
 168         struct hci_dev *hdev = (struct hci_dev *) skb->dev;
 169
 170         BT_DBG("%s urb %p status %d count %d", hdev->name,
 171                                         urb, urb->status, urb->actual_length);
 172
 173         if (!test_bit(HCI_RUNNING, &hdev->flags))
 174                 goto done;
 175
 176         if (!urb->status)
 177                 hdev->stat.byte_tx += urb->transfer_buffer_length;
 178         else
 179                 hdev->stat.err_tx++;
 180
 181 done:
 182         kfree(urb->setup_packet);
 183
 184         kfree_skb(skb);
 185 }
 186
 187 static void bpa10x_rx_complete(struct urb *urb)
 188 {
 189         struct hci_dev *hdev = urb->context;
 190         struct bpa10x_data *data = hci_get_drvdata(hdev);
 191         int err;
 192
 193         BT_DBG("%s urb %p status %d count %d", hdev->name,
 194                                         urb, urb->status, urb->actual_length);
 195
 196         if (!test_bit(HCI_RUNNING, &hdev->flags))
 197                 return;
 198
 199         if (urb->status == 0) {
 200                 if (bpa10x_recv(hdev, usb_pipebulk(urb->pipe),
 201                                                 urb->transfer_buffer,
 202                                                 urb->actual_length) < 0) {
 203                         BT_ERR("%s corrupted event packet", hdev->name);
 204                         hdev->stat.err_rx++;
 205                 }
 206         }
 207
 208         usb_anchor_urb(urb, &data->rx_anchor);
 209
 210         err = usb_submit_urb(urb, GFP_ATOMIC);
 211         if (err < 0) {
 212                 BT_ERR("%s urb %p failed to resubmit (%d)",
 213                                                 hdev->name, urb, -err);
 214                 usb_unanchor_urb(urb);
 215         }
 216 }
 217
 218 static inline int bpa10x_submit_intr_urb(struct hci_dev *hdev)
 219 {
 220         struct bpa10x_data *data = hci_get_drvdata(hdev);
 221         struct urb *urb;
 222         unsigned char *buf;
 223         unsigned int pipe;
 224         int err, size = 16;
 225
 226         BT_DBG("%s", hdev->name);
 227
 228         urb = usb_alloc_urb(0, GFP_KERNEL);
 229         if (!urb)
 230                 return -ENOMEM;
 231
 232         buf = kmalloc(size, GFP_KERNEL);
 233         if (!buf) {
 234                 usb_free_urb(urb);
 235                 return -ENOMEM;
 236         }
 237
 238         pipe = usb_rcvintpipe(data->udev, 0x81);
 239
 240         usb_fill_int_urb(urb, data->udev, pipe, buf, size,
 241                                                 bpa10x_rx_complete, hdev, 1);
 242
 243         urb->transfer_flags |= URB_FREE_BUFFER;
 244
 245         usb_anchor_urb(urb, &data->rx_anchor);
 246
 247         err = usb_submit_urb(urb, GFP_KERNEL);
 248         if (err < 0) {
 249                 BT_ERR("%s urb %p submission failed (%d)",
 250                                                 hdev->name, urb, -err);
 251                 usb_unanchor_urb(urb);
 252         }
 253
 254         usb_free_urb(urb);
 255
 256         return err;
 257 }
 258
 259 static inline int bpa10x_submit_bulk_urb(struct hci_dev *hdev)
 260 {
 261         struct bpa10x_data *data = hci_get_drvdata(hdev);
 262         struct urb *urb;
 263         unsigned char *buf;
 264         unsigned int pipe;
 265         int err, size = 64;
 266
 267         BT_DBG("%s", hdev->name);
 268
 269         urb = usb_alloc_urb(0, GFP_KERNEL);
 270         if (!urb)
 271                 return -ENOMEM;
 272
 273         buf = kmalloc(size, GFP_KERNEL);
 274         if (!buf) {
 275                 usb_free_urb(urb);
 276                 return -ENOMEM;
 277         }
 278
 279         pipe = usb_rcvbulkpipe(data->udev, 0x82);
 280
 281         usb_fill_bulk_urb(urb, data->udev, pipe,
 282                                         buf, size, bpa10x_rx_complete, hdev);
 283
 284         urb->transfer_flags |= URB_FREE_BUFFER;
 285
 286         usb_anchor_urb(urb, &data->rx_anchor);
 287
 288         err = usb_submit_urb(urb, GFP_KERNEL);
 289         if (err < 0) {
 290                 BT_ERR("%s urb %p submission failed (%d)",
 291                                                 hdev->name, urb, -err);
 292                 usb_unanchor_urb(urb);
 293         }
 294
 295         usb_free_urb(urb);
 296
 297         return err;
 298 }
 299
 300 static int bpa10x_open(struct hci_dev *hdev)
 301 {
 302         struct bpa10x_data *data = hci_get_drvdata(hdev);
 303         int err;
 304
 305         BT_DBG("%s", hdev->name);
 306
 307         if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
 308                 return 0;
 309
 310         err = bpa10x_submit_intr_urb(hdev);
 311         if (err < 0)
 312                 goto error;
 313
 314         err = bpa10x_submit_bulk_urb(hdev);
 315         if (err < 0)
 316                 goto error;
 317
 318         return 0;
 319
 320 error:
 321         usb_kill_anchored_urbs(&data->rx_anchor);
 322
 323         clear_bit(HCI_RUNNING, &hdev->flags);
 324
 325         return err;
 326 }
 327
 328 static int bpa10x_close(struct hci_dev *hdev)
 329 {
 330         struct bpa10x_data *data = hci_get_drvdata(hdev);
 331
 332         BT_DBG("%s", hdev->name);
 333
 334         if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
 335                 return 0;
 336
 337         usb_kill_anchored_urbs(&data->rx_anchor);
 338
 339         return 0;
 340 }
 341
 342 static int bpa10x_flush(struct hci_dev *hdev)
 343 {
 344         struct bpa10x_data *data = hci_get_drvdata(hdev);
 345
 346         BT_DBG("%s", hdev->name);
 347
 348         usb_kill_anchored_urbs(&data->tx_anchor);
 349
 350         return 0;
 351 }
 352
 353 static int bpa10x_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 354 {
 355         struct bpa10x_data *data = hci_get_drvdata(hdev);
 356         struct usb_ctrlrequest *dr;
 357         struct urb *urb;
 358         unsigned int pipe;
 359         int err;
 360
 361         BT_DBG("%s", hdev->name);
 362
 363         if (!test_bit(HCI_RUNNING, &hdev->flags))
 364                 return -EBUSY;
 365
 366         skb->dev = (void *) hdev;
 367
 368         urb = usb_alloc_urb(0, GFP_ATOMIC);
 369         if (!urb)
 370                 return -ENOMEM;
 371
 372         /* Prepend skb with frame type */
 373         *skb_push(skb, 1) = bt_cb(skb)->pkt_type;
 374
 375         switch (bt_cb(skb)->pkt_type) {
 376         case HCI_COMMAND_PKT:
 377                 dr = kmalloc(sizeof(*dr), GFP_ATOMIC);
 378                 if (!dr) {
 379                         usb_free_urb(urb);
 380                         return -ENOMEM;
 381                 }
 382
 383                 dr->bRequestType = USB_TYPE_VENDOR;
 384                 dr->bRequest     = 0;
 385                 dr->wIndex       = 0;
 386                 dr->wValue       = 0;
 387                 dr->wLength      = __cpu_to_le16(skb->len);
 388
 389                 pipe = usb_sndctrlpipe(data->udev, 0x00);
 390
 391                 usb_fill_control_urb(urb, data->udev, pipe, (void *) dr,
 392                                 skb->data, skb->len, bpa10x_tx_complete, skb);
 393
 394                 hdev->stat.cmd_tx++;
 395                 break;
 396
 397         case HCI_ACLDATA_PKT:
 398                 pipe = usb_sndbulkpipe(data->udev, 0x02);
 399
 400                 usb_fill_bulk_urb(urb, data->udev, pipe,
 401                                 skb->data, skb->len, bpa10x_tx_complete, skb);
 402
 403                 hdev->stat.acl_tx++;
 404                 break;
 405
 406         case HCI_SCODATA_PKT:
 407                 pipe = usb_sndbulkpipe(data->udev, 0x02);
 408
 409                 usb_fill_bulk_urb(urb, data->udev, pipe,
 410                                 skb->data, skb->len, bpa10x_tx_complete, skb);
 411
 412                 hdev->stat.sco_tx++;
 413                 break;
 414
 415         default:
 416                 usb_free_urb(urb);
 417                 return -EILSEQ;
 418         }
 419
 420         usb_anchor_urb(urb, &data->tx_anchor);
 421
 422         err = usb_submit_urb(urb, GFP_ATOMIC);
 423         if (err < 0) {
 424                 BT_ERR("%s urb %p submission failed", hdev->name, urb);
 425                 kfree(urb->setup_packet);
 426                 usb_unanchor_urb(urb);
 427         }
 428
 429         usb_free_urb(urb);
 430
 431         return 0;
 432 }
 433
 434 static int bpa10x_probe(struct usb_interface *intf, const struct usb_device_id *id)
 435 {
 436         struct bpa10x_data *data;
 437         struct hci_dev *hdev;
 438         int err;
 439
 440         BT_DBG("intf %p id %p", intf, id);
 441
 442         if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
 443                 return -ENODEV;
 444
 445         data = devm_kzalloc(&intf->dev, sizeof(*data), GFP_KERNEL);
 446         if (!data)
 447                 return -ENOMEM;
 448
 449         data->udev = interface_to_usbdev(intf);
 450
 451         init_usb_anchor(&data->tx_anchor);
 452         init_usb_anchor(&data->rx_anchor);
 453
 454         hdev = hci_alloc_dev();
 455         if (!hdev)
 456                 return -ENOMEM;
 457
 458         hdev->bus = HCI_USB;
 459         hci_set_drvdata(hdev, data);
 460
 461         data->hdev = hdev;
 462
 463         SET_HCIDEV_DEV(hdev, &intf->dev);
 464
 465         hdev->open     = bpa10x_open;
 466         hdev->close    = bpa10x_close;
 467         hdev->flush    = bpa10x_flush;
 468         hdev->send     = bpa10x_send_frame;
 469
 470         set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 471
 472         err = hci_register_dev(hdev);
 473         if (err < 0) {
 474                 hci_free_dev(hdev);
 475                 return err;
 476         }
 477
 478         usb_set_intfdata(intf, data);
 479
 480         return 0;
 481 }
 482
 483 static void bpa10x_disconnect(struct usb_interface *intf)
 484 {
 485         struct bpa10x_data *data = usb_get_intfdata(intf);
 486
 487         BT_DBG("intf %p", intf);
 488
 489         if (!data)
 490                 return;
 491
 492         usb_set_intfdata(intf, NULL);
 493
 494         hci_unregister_dev(data->hdev);
 495
 496         hci_free_dev(data->hdev);
 497         kfree_skb(data->rx_skb[0]);
 498         kfree_skb(data->rx_skb[1]);
 499 }
 500
 501 static struct usb_driver bpa10x_driver = {
 502         .name           = "bpa10x",
 503         .probe          = bpa10x_probe,
 504         .disconnect     = bpa10x_disconnect,
 505         .id_table       = bpa10x_table,
 506         .disable_hub_initiated_lpm = 1,
 507 };
 508
 509 module_usb_driver(bpa10x_driver);
 510
 511 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 512 MODULE_DESCRIPTION("Digianswer Bluetooth USB driver ver " VERSION);
 513 MODULE_VERSION(VERSION);
 514 MODULE_LICENSE("GPL");