Logo Search packages:      
Sourcecode: linux version File versions  Download package

bpa10x.c

/*
 *
 *  Digianswer Bluetooth USB driver
 *
 *  Copyright (C) 2004-2007  Marcel Holtmann <marcel@holtmann.org>
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/skbuff.h>

#include <linux/usb.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

#ifndef CONFIG_BT_HCIBPA10X_DEBUG
#undef  BT_DBG
#define BT_DBG(D...)
#endif

#define VERSION "0.9"

static int ignore = 0;

static struct usb_device_id bpa10x_table[] = {
      /* Tektronix BPA 100/105 (Digianswer) */
      { USB_DEVICE(0x08fd, 0x0002) },

      { }   /* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, bpa10x_table);

struct bpa10x_data {
      struct hci_dev    *hdev;
      struct usb_device *udev;

      struct usb_anchor tx_anchor;
      struct usb_anchor rx_anchor;

      struct sk_buff *rx_skb[2];
};

#define HCI_VENDOR_HDR_SIZE 5

struct hci_vendor_hdr {
      __u8    type;
      __le16  snum;
      __le16  dlen;
} __attribute__ ((packed));

static int bpa10x_recv(struct hci_dev *hdev, int queue, void *buf, int count)
{
      struct bpa10x_data *data = hdev->driver_data;

      BT_DBG("%s queue %d buffer %p count %d", hdev->name,
                                          queue, buf, count);

      if (queue < 0 || queue > 1)
            return -EILSEQ;

      hdev->stat.byte_rx += count;

      while (count) {
            struct sk_buff *skb = data->rx_skb[queue];
            struct { __u8 type; int expect; } *scb;
            int type, len = 0;

            if (!skb) {
                  /* Start of the frame */

                  type = *((__u8 *) buf);
                  count--; buf++;

                  switch (type) {
                  case HCI_EVENT_PKT:
                        if (count >= HCI_EVENT_HDR_SIZE) {
                              struct hci_event_hdr *h = buf;
                              len = HCI_EVENT_HDR_SIZE + h->plen;
                        } else
                              return -EILSEQ;
                        break;

                  case HCI_ACLDATA_PKT:
                        if (count >= HCI_ACL_HDR_SIZE) {
                              struct hci_acl_hdr *h = buf;
                              len = HCI_ACL_HDR_SIZE +
                                          __le16_to_cpu(h->dlen);
                        } else
                              return -EILSEQ;
                        break;

                  case HCI_SCODATA_PKT:
                        if (count >= HCI_SCO_HDR_SIZE) {
                              struct hci_sco_hdr *h = buf;
                              len = HCI_SCO_HDR_SIZE + h->dlen;
                        } else
                              return -EILSEQ;
                        break;

                  case HCI_VENDOR_PKT:
                        if (count >= HCI_VENDOR_HDR_SIZE) {
                              struct hci_vendor_hdr *h = buf;
                              len = HCI_VENDOR_HDR_SIZE +
                                          __le16_to_cpu(h->dlen);
                        } else
                              return -EILSEQ;
                        break;
                  }

                  skb = bt_skb_alloc(len, GFP_ATOMIC);
                  if (!skb) {
                        BT_ERR("%s no memory for packet", hdev->name);
                        return -ENOMEM;
                  }

                  skb->dev = (void *) hdev;

                  data->rx_skb[queue] = skb;

                  scb = (void *) skb->cb;
                  scb->type = type;
                  scb->expect = len;
            } else {
                  /* Continuation */

                  scb = (void *) skb->cb;
                  len = scb->expect;
            }

            len = min(len, count);

            memcpy(skb_put(skb, len), buf, len);

            scb->expect -= len;

            if (scb->expect == 0) {
                  /* Complete frame */

                  data->rx_skb[queue] = NULL;

                  bt_cb(skb)->pkt_type = scb->type;
                  hci_recv_frame(skb);
            }

            count -= len; buf += len;
      }

      return 0;
}

static void bpa10x_tx_complete(struct urb *urb)
{
      struct sk_buff *skb = urb->context;
      struct hci_dev *hdev = (struct hci_dev *) skb->dev;

      BT_DBG("%s urb %p status %d count %d", hdev->name,
                              urb, urb->status, urb->actual_length);

      if (!test_bit(HCI_RUNNING, &hdev->flags))
            goto done;

      if (!urb->status)
            hdev->stat.byte_tx += urb->transfer_buffer_length;
      else
            hdev->stat.err_tx++;

done:
      kfree(urb->setup_packet);

      kfree_skb(skb);
}

static void bpa10x_rx_complete(struct urb *urb)
{
      struct hci_dev *hdev = urb->context;
      struct bpa10x_data *data = hdev->driver_data;
      int err;

      BT_DBG("%s urb %p status %d count %d", hdev->name,
                              urb, urb->status, urb->actual_length);

      if (!test_bit(HCI_RUNNING, &hdev->flags))
            return;

      if (urb->status == 0) {
            if (bpa10x_recv(hdev, usb_pipebulk(urb->pipe),
                                    urb->transfer_buffer,
                                    urb->actual_length) < 0) {
                  BT_ERR("%s corrupted event packet", hdev->name);
                  hdev->stat.err_rx++;
            }
      }

      usb_anchor_urb(urb, &data->rx_anchor);

      err = usb_submit_urb(urb, GFP_ATOMIC);
      if (err < 0) {
            BT_ERR("%s urb %p failed to resubmit (%d)",
                                    hdev->name, urb, -err);
            usb_unanchor_urb(urb);
      }
}

static inline int bpa10x_submit_intr_urb(struct hci_dev *hdev)
{
      struct bpa10x_data *data = hdev->driver_data;
      struct urb *urb;
      unsigned char *buf;
      unsigned int pipe;
      int err, size = 16;

      BT_DBG("%s", hdev->name);

      urb = usb_alloc_urb(0, GFP_KERNEL);
      if (!urb)
            return -ENOMEM;

      buf = kmalloc(size, GFP_KERNEL);
      if (!buf) {
            usb_free_urb(urb);
            return -ENOMEM;
      }

      pipe = usb_rcvintpipe(data->udev, 0x81);

      usb_fill_int_urb(urb, data->udev, pipe, buf, size,
                                    bpa10x_rx_complete, hdev, 1);

      urb->transfer_flags |= URB_FREE_BUFFER;

      usb_anchor_urb(urb, &data->rx_anchor);

      err = usb_submit_urb(urb, GFP_KERNEL);
      if (err < 0) {
            BT_ERR("%s urb %p submission failed (%d)",
                                    hdev->name, urb, -err);
            usb_unanchor_urb(urb);
            kfree(buf);
      }

      usb_free_urb(urb);

      return err;
}

static inline int bpa10x_submit_bulk_urb(struct hci_dev *hdev)
{
      struct bpa10x_data *data = hdev->driver_data;
      struct urb *urb;
      unsigned char *buf;
      unsigned int pipe;
      int err, size = 64;

      BT_DBG("%s", hdev->name);

      urb = usb_alloc_urb(0, GFP_KERNEL);
      if (!urb)
            return -ENOMEM;

      buf = kmalloc(size, GFP_KERNEL);
      if (!buf) {
            usb_free_urb(urb);
            return -ENOMEM;
      }

      pipe = usb_rcvbulkpipe(data->udev, 0x82);

      usb_fill_bulk_urb(urb, data->udev, pipe,
                              buf, size, bpa10x_rx_complete, hdev);

      urb->transfer_flags |= URB_FREE_BUFFER;

      usb_anchor_urb(urb, &data->rx_anchor);

      err = usb_submit_urb(urb, GFP_KERNEL);
      if (err < 0) {
            BT_ERR("%s urb %p submission failed (%d)",
                                    hdev->name, urb, -err);
            usb_unanchor_urb(urb);
            kfree(buf);
      }

      usb_free_urb(urb);

      return err;
}

static int bpa10x_open(struct hci_dev *hdev)
{
      struct bpa10x_data *data = hdev->driver_data;
      int err;

      BT_DBG("%s", hdev->name);

      if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
            return 0;

      err = bpa10x_submit_intr_urb(hdev);
      if (err < 0)
            goto error;

      err = bpa10x_submit_bulk_urb(hdev);
      if (err < 0)
            goto error;

      return 0;

error:
      usb_kill_anchored_urbs(&data->rx_anchor);

      clear_bit(HCI_RUNNING, &hdev->flags);

      return err;
}

static int bpa10x_close(struct hci_dev *hdev)
{
      struct bpa10x_data *data = hdev->driver_data;

      BT_DBG("%s", hdev->name);

      if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
            return 0;

      usb_kill_anchored_urbs(&data->rx_anchor);

      return 0;
}

static int bpa10x_flush(struct hci_dev *hdev)
{
      struct bpa10x_data *data = hdev->driver_data;

      BT_DBG("%s", hdev->name);

      usb_kill_anchored_urbs(&data->tx_anchor);

      return 0;
}

static int bpa10x_send_frame(struct sk_buff *skb)
{
      struct hci_dev *hdev = (struct hci_dev *) skb->dev;
      struct bpa10x_data *data = hdev->driver_data;
      struct usb_ctrlrequest *dr;
      struct urb *urb;
      unsigned int pipe;
      int err;

      BT_DBG("%s", hdev->name);

      if (!test_bit(HCI_RUNNING, &hdev->flags))
            return -EBUSY;

      urb = usb_alloc_urb(0, GFP_ATOMIC);
      if (!urb)
            return -ENOMEM;

      /* Prepend skb with frame type */
      *skb_push(skb, 1) = bt_cb(skb)->pkt_type;

      switch (bt_cb(skb)->pkt_type) {
      case HCI_COMMAND_PKT:
            dr = kmalloc(sizeof(*dr), GFP_ATOMIC);
            if (!dr) {
                  usb_free_urb(urb);
                  return -ENOMEM;
            }

            dr->bRequestType = USB_TYPE_VENDOR;
            dr->bRequest     = 0;
            dr->wIndex       = 0;
            dr->wValue       = 0;
            dr->wLength      = __cpu_to_le16(skb->len);

            pipe = usb_sndctrlpipe(data->udev, 0x00);

            usb_fill_control_urb(urb, data->udev, pipe, (void *) dr,
                        skb->data, skb->len, bpa10x_tx_complete, skb);

            hdev->stat.cmd_tx++;
            break;

      case HCI_ACLDATA_PKT:
            pipe = usb_sndbulkpipe(data->udev, 0x02);

            usb_fill_bulk_urb(urb, data->udev, pipe,
                        skb->data, skb->len, bpa10x_tx_complete, skb);

            hdev->stat.acl_tx++;
            break;

      case HCI_SCODATA_PKT:
            pipe = usb_sndbulkpipe(data->udev, 0x02);

            usb_fill_bulk_urb(urb, data->udev, pipe,
                        skb->data, skb->len, bpa10x_tx_complete, skb);

            hdev->stat.sco_tx++;
            break;

      default:
            return -EILSEQ;
      }

      usb_anchor_urb(urb, &data->tx_anchor);

      err = usb_submit_urb(urb, GFP_ATOMIC);
      if (err < 0) {
            BT_ERR("%s urb %p submission failed", hdev->name, urb);
            kfree(urb->setup_packet);
            usb_unanchor_urb(urb);
      }

      usb_free_urb(urb);

      return 0;
}

static void bpa10x_destruct(struct hci_dev *hdev)
{
      struct bpa10x_data *data = hdev->driver_data;

      BT_DBG("%s", hdev->name);

      kfree(data->rx_skb[0]);
      kfree(data->rx_skb[1]);
      kfree(data);
}

static int bpa10x_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
      struct bpa10x_data *data;
      struct hci_dev *hdev;
      int err;

      BT_DBG("intf %p id %p", intf, id);

      if (ignore)
            return -ENODEV;

      if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
            return -ENODEV;

      data = kzalloc(sizeof(*data), GFP_KERNEL);
      if (!data)
            return -ENOMEM;

      data->udev = interface_to_usbdev(intf);

      init_usb_anchor(&data->tx_anchor);
      init_usb_anchor(&data->rx_anchor);

      hdev = hci_alloc_dev();
      if (!hdev) {
            kfree(data);
            return -ENOMEM;
      }

      hdev->type = HCI_USB;
      hdev->driver_data = data;

      data->hdev = hdev;

      SET_HCIDEV_DEV(hdev, &intf->dev);

      hdev->open     = bpa10x_open;
      hdev->close    = bpa10x_close;
      hdev->flush    = bpa10x_flush;
      hdev->send     = bpa10x_send_frame;
      hdev->destruct = bpa10x_destruct;

      hdev->owner = THIS_MODULE;

      err = hci_register_dev(hdev);
      if (err < 0) {
            hci_free_dev(hdev);
            kfree(data);
            return err;
      }

      usb_set_intfdata(intf, data);

      return 0;
}

static void bpa10x_disconnect(struct usb_interface *intf)
{
      struct bpa10x_data *data = usb_get_intfdata(intf);

      BT_DBG("intf %p", intf);

      if (!data)
            return;

      usb_set_intfdata(intf, NULL);

      hci_unregister_dev(data->hdev);

      hci_free_dev(data->hdev);
}

static struct usb_driver bpa10x_driver = {
      .name       = "bpa10x",
      .probe            = bpa10x_probe,
      .disconnect = bpa10x_disconnect,
      .id_table   = bpa10x_table,
};

static int __init bpa10x_init(void)
{
      BT_INFO("Digianswer Bluetooth USB driver ver %s", VERSION);

      return usb_register(&bpa10x_driver);
}

static void __exit bpa10x_exit(void)
{
      usb_deregister(&bpa10x_driver);
}

module_init(bpa10x_init);
module_exit(bpa10x_exit);

module_param(ignore, bool, 0644);
MODULE_PARM_DESC(ignore, "Ignore devices from the matching table");

MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
MODULE_DESCRIPTION("Digianswer Bluetooth USB driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");

Generated by  Doxygen 1.6.0   Back to index