linux/drivers/bluetooth/bpa10x.c
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   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
  40static const struct usb_device_id bpa10x_table[] = {
  41        /* Tektronix BPA 100/105 (Digianswer) */
  42        { USB_DEVICE(0x08fd, 0x0002) },
  43
  44        { }     /* Terminating entry */
  45};
  46
  47MODULE_DEVICE_TABLE(usb, bpa10x_table);
  48
  49struct 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
  61struct hci_vendor_hdr {
  62        __u8    type;
  63        __le16  snum;
  64        __le16  dlen;
  65} __packed;
  66
  67static 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
 165static 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
 181done:
 182        kfree(urb->setup_packet);
 183
 184        kfree_skb(skb);
 185}
 186
 187static 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
 218static 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
 259static 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
 300static 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
 320error:
 321        usb_kill_anchored_urbs(&data->rx_anchor);
 322
 323        clear_bit(HCI_RUNNING, &hdev->flags);
 324
 325        return err;
 326}
 327
 328static 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
 342static 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
 353static 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
 434static 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
 483static 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
 501static 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
 509module_usb_driver(bpa10x_driver);
 510
 511MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 512MODULE_DESCRIPTION("Digianswer Bluetooth USB driver ver " VERSION);
 513MODULE_VERSION(VERSION);
 514MODULE_LICENSE("GPL");
 515
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