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 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                        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
 167static 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
 183done:
 184        kfree(urb->setup_packet);
 185
 186        kfree_skb(skb);
 187}
 188
 189static 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
 220static 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
 261static 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
 302static 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
 322error:
 323        usb_kill_anchored_urbs(&data->rx_anchor);
 324
 325        clear_bit(HCI_RUNNING, &hdev->flags);
 326
 327        return err;
 328}
 329
 330static 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
 344static 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
 355static 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
 435static 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 = kzalloc(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                kfree(data);
 458                return -ENOMEM;
 459        }
 460
 461        hdev->bus = HCI_USB;
 462        hci_set_drvdata(hdev, data);
 463
 464        data->hdev = hdev;
 465
 466        SET_HCIDEV_DEV(hdev, &intf->dev);
 467
 468        hdev->open     = bpa10x_open;
 469        hdev->close    = bpa10x_close;
 470        hdev->flush    = bpa10x_flush;
 471        hdev->send     = bpa10x_send_frame;
 472
 473        set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
 474
 475        err = hci_register_dev(hdev);
 476        if (err < 0) {
 477                hci_free_dev(hdev);
 478                kfree(data);
 479                return err;
 480        }
 481
 482        usb_set_intfdata(intf, data);
 483
 484        return 0;
 485}
 486
 487static void bpa10x_disconnect(struct usb_interface *intf)
 488{
 489        struct bpa10x_data *data = usb_get_intfdata(intf);
 490
 491        BT_DBG("intf %p", intf);
 492
 493        if (!data)
 494                return;
 495
 496        usb_set_intfdata(intf, NULL);
 497
 498        hci_unregister_dev(data->hdev);
 499
 500        hci_free_dev(data->hdev);
 501        kfree_skb(data->rx_skb[0]);
 502        kfree_skb(data->rx_skb[1]);
 503        kfree(data);
 504}
 505
 506static struct usb_driver bpa10x_driver = {
 507        .name           = "bpa10x",
 508        .probe          = bpa10x_probe,
 509        .disconnect     = bpa10x_disconnect,
 510        .id_table       = bpa10x_table,
 511        .disable_hub_initiated_lpm = 1,
 512};
 513
 514module_usb_driver(bpa10x_driver);
 515
 516MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 517MODULE_DESCRIPTION("Digianswer Bluetooth USB driver ver " VERSION);
 518MODULE_VERSION(VERSION);
 519MODULE_LICENSE("GPL");
 520
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