/*
   *
   *  Generic Bluetooth USB driver
   *

   *  Copyright (C) 2005-2008  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>

  #define VERSION "0.6"

  
  static int ignore_dga;
  static int ignore_csr;
  static int ignore_sniffer;
  static int disable_scofix;
  static int force_scofix;

  
  static int reset = 1;

  
  static struct usb_driver btusb_driver;
  
  #define BTUSB_IGNORE		0x01

  #define BTUSB_DIGIANSWER	0x02
  #define BTUSB_CSR		0x04
  #define BTUSB_SNIFFER		0x08
  #define BTUSB_BCM92035		0x10
  #define BTUSB_BROKEN_ISOC	0x20
  #define BTUSB_WRONG_SCO_MTU	0x40

  
  static struct usb_device_id btusb_table[] = {
  	/* Generic Bluetooth USB device */
  	{ USB_DEVICE_INFO(0xe0, 0x01, 0x01) },

  	/* Apple MacBookPro 7,1 */
  	{ USB_DEVICE(0x05ac, 0x8213) },

  	/* Apple iMac11,1 */
  	{ USB_DEVICE(0x05ac, 0x8215) },

  	/* Apple MacBookPro6,2 */
  	{ USB_DEVICE(0x05ac, 0x8218) },

  	/* Apple MacBookAir3,1, MacBookAir3,2 */
  	{ USB_DEVICE(0x05ac, 0x821b) },

  	/* AVM BlueFRITZ! USB v2.0 */
  	{ USB_DEVICE(0x057c, 0x3800) },
  
  	/* Bluetooth Ultraport Module from IBM */
  	{ USB_DEVICE(0x04bf, 0x030a) },
  
  	/* ALPS Modules with non-standard id */
  	{ USB_DEVICE(0x044e, 0x3001) },
  	{ USB_DEVICE(0x044e, 0x3002) },
  
  	/* Ericsson with non-standard id */
  	{ USB_DEVICE(0x0bdb, 0x1002) },
  
  	/* Canyon CN-BTU1 with HID interfaces */

  	{ USB_DEVICE(0x0c10, 0x0000) },

  	{ }	/* Terminating entry */
  };
  
  MODULE_DEVICE_TABLE(usb, btusb_table);
  
  static struct usb_device_id blacklist_table[] = {

  	/* CSR BlueCore devices */
  	{ USB_DEVICE(0x0a12, 0x0001), .driver_info = BTUSB_CSR },
  
  	/* Broadcom BCM2033 without firmware */
  	{ USB_DEVICE(0x0a5c, 0x2033), .driver_info = BTUSB_IGNORE },

  	/* Atheros 3011 with sflash firmware */
  	{ USB_DEVICE(0x0cf3, 0x3002), .driver_info = BTUSB_IGNORE },

  	/* Atheros AR9285 Malbec with sflash firmware */
  	{ USB_DEVICE(0x03f0, 0x311d), .driver_info = BTUSB_IGNORE },

  	/* Broadcom BCM2035 */

  	{ USB_DEVICE(0x0a5c, 0x2035), .driver_info = BTUSB_WRONG_SCO_MTU },
  	{ USB_DEVICE(0x0a5c, 0x200a), .driver_info = BTUSB_WRONG_SCO_MTU },
  	{ USB_DEVICE(0x0a5c, 0x2009), .driver_info = BTUSB_BCM92035 },

  
  	/* Broadcom BCM2045 */

  	{ USB_DEVICE(0x0a5c, 0x2039), .driver_info = BTUSB_WRONG_SCO_MTU },
  	{ USB_DEVICE(0x0a5c, 0x2101), .driver_info = BTUSB_WRONG_SCO_MTU },

  	/* IBM/Lenovo ThinkPad with Broadcom chip */

  	{ USB_DEVICE(0x0a5c, 0x201e), .driver_info = BTUSB_WRONG_SCO_MTU },
  	{ USB_DEVICE(0x0a5c, 0x2110), .driver_info = BTUSB_WRONG_SCO_MTU },

  
  	/* HP laptop with Broadcom chip */

  	{ USB_DEVICE(0x03f0, 0x171d), .driver_info = BTUSB_WRONG_SCO_MTU },

  
  	/* Dell laptop with Broadcom chip */

  	{ USB_DEVICE(0x413c, 0x8126), .driver_info = BTUSB_WRONG_SCO_MTU },

  	/* Dell Wireless 370 and 410 devices */

  	{ USB_DEVICE(0x413c, 0x8152), .driver_info = BTUSB_WRONG_SCO_MTU },

  	{ USB_DEVICE(0x413c, 0x8156), .driver_info = BTUSB_WRONG_SCO_MTU },

  	/* Belkin F8T012 and F8T013 devices */
  	{ USB_DEVICE(0x050d, 0x0012), .driver_info = BTUSB_WRONG_SCO_MTU },
  	{ USB_DEVICE(0x050d, 0x0013), .driver_info = BTUSB_WRONG_SCO_MTU },

  	/* Asus WL-BTD202 device */
  	{ USB_DEVICE(0x0b05, 0x1715), .driver_info = BTUSB_WRONG_SCO_MTU },
  
  	/* Kensington Bluetooth USB adapter */
  	{ USB_DEVICE(0x047d, 0x105e), .driver_info = BTUSB_WRONG_SCO_MTU },

  	/* RTX Telecom based adapters with buggy SCO support */
  	{ USB_DEVICE(0x0400, 0x0807), .driver_info = BTUSB_BROKEN_ISOC },
  	{ USB_DEVICE(0x0400, 0x080a), .driver_info = BTUSB_BROKEN_ISOC },
  
  	/* CONWISE Technology based adapters with buggy SCO support */
  	{ USB_DEVICE(0x0e5e, 0x6622), .driver_info = BTUSB_BROKEN_ISOC },

  	/* Digianswer devices */
  	{ USB_DEVICE(0x08fd, 0x0001), .driver_info = BTUSB_DIGIANSWER },
  	{ USB_DEVICE(0x08fd, 0x0002), .driver_info = BTUSB_IGNORE },
  
  	/* CSR BlueCore Bluetooth Sniffer */
  	{ USB_DEVICE(0x0a12, 0x0002), .driver_info = BTUSB_SNIFFER },
  
  	/* Frontline ComProbe Bluetooth Sniffer */
  	{ USB_DEVICE(0x16d3, 0x0002), .driver_info = BTUSB_SNIFFER },

  	{ }	/* Terminating entry */
  };

  #define BTUSB_MAX_ISOC_FRAMES	10

  #define BTUSB_INTR_RUNNING	0
  #define BTUSB_BULK_RUNNING	1

  #define BTUSB_ISOC_RUNNING	2

  #define BTUSB_SUSPENDING	3

  #define BTUSB_DID_ISO_RESUME	4

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

  	struct usb_interface *intf;

  	struct usb_interface *isoc;

  
  	spinlock_t lock;
  
  	unsigned long flags;
  
  	struct work_struct work;

  	struct work_struct waker;

  
  	struct usb_anchor tx_anchor;
  	struct usb_anchor intr_anchor;
  	struct usb_anchor bulk_anchor;

  	struct usb_anchor isoc_anchor;

  	struct usb_anchor deferred;
  	int tx_in_flight;
  	spinlock_t txlock;

  
  	struct usb_endpoint_descriptor *intr_ep;
  	struct usb_endpoint_descriptor *bulk_tx_ep;
  	struct usb_endpoint_descriptor *bulk_rx_ep;

  	struct usb_endpoint_descriptor *isoc_tx_ep;
  	struct usb_endpoint_descriptor *isoc_rx_ep;

  	__u8 cmdreq_type;

  	unsigned int sco_num;

  	int isoc_altsetting;

  	int suspend_count;

  };

  static int inc_tx(struct btusb_data *data)
  {
  	unsigned long flags;
  	int rv;
  
  	spin_lock_irqsave(&data->txlock, flags);
  	rv = test_bit(BTUSB_SUSPENDING, &data->flags);
  	if (!rv)
  		data->tx_in_flight++;
  	spin_unlock_irqrestore(&data->txlock, flags);
  
  	return rv;
  }

  static void btusb_intr_complete(struct urb *urb)
  {
  	struct hci_dev *hdev = urb->context;
  	struct btusb_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) {

  		hdev->stat.byte_rx += urb->actual_length;

  		if (hci_recv_fragment(hdev, HCI_EVENT_PKT,
  						urb->transfer_buffer,
  						urb->actual_length) < 0) {
  			BT_ERR("%s corrupted event packet", hdev->name);
  			hdev->stat.err_rx++;
  		}
  	}
  
  	if (!test_bit(BTUSB_INTR_RUNNING, &data->flags))
  		return;

  	usb_mark_last_busy(data->udev);

  	usb_anchor_urb(urb, &data->intr_anchor);
  
  	err = usb_submit_urb(urb, GFP_ATOMIC);
  	if (err < 0) {

  		if (err != -EPERM)
  			BT_ERR("%s urb %p failed to resubmit (%d)",

  						hdev->name, urb, -err);
  		usb_unanchor_urb(urb);
  	}
  }

  static int btusb_submit_intr_urb(struct hci_dev *hdev, gfp_t mem_flags)

  {
  	struct btusb_data *data = hdev->driver_data;
  	struct urb *urb;
  	unsigned char *buf;
  	unsigned int pipe;
  	int err, size;
  
  	BT_DBG("%s", hdev->name);

  	if (!data->intr_ep)
  		return -ENODEV;

  	urb = usb_alloc_urb(0, mem_flags);

  	if (!urb)
  		return -ENOMEM;
  
  	size = le16_to_cpu(data->intr_ep->wMaxPacketSize);

  	buf = kmalloc(size, mem_flags);

  	if (!buf) {
  		usb_free_urb(urb);
  		return -ENOMEM;
  	}
  
  	pipe = usb_rcvintpipe(data->udev, data->intr_ep->bEndpointAddress);
  
  	usb_fill_int_urb(urb, data->udev, pipe, buf, size,
  						btusb_intr_complete, hdev,
  						data->intr_ep->bInterval);
  
  	urb->transfer_flags |= URB_FREE_BUFFER;
  
  	usb_anchor_urb(urb, &data->intr_anchor);

  	err = usb_submit_urb(urb, mem_flags);

  	if (err < 0) {
  		BT_ERR("%s urb %p submission failed (%d)",
  						hdev->name, urb, -err);
  		usb_unanchor_urb(urb);

  	}
  
  	usb_free_urb(urb);
  
  	return err;
  }
  
  static void btusb_bulk_complete(struct urb *urb)
  {
  	struct hci_dev *hdev = urb->context;
  	struct btusb_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) {

  		hdev->stat.byte_rx += urb->actual_length;

  		if (hci_recv_fragment(hdev, HCI_ACLDATA_PKT,
  						urb->transfer_buffer,
  						urb->actual_length) < 0) {
  			BT_ERR("%s corrupted ACL packet", hdev->name);
  			hdev->stat.err_rx++;
  		}
  	}
  
  	if (!test_bit(BTUSB_BULK_RUNNING, &data->flags))
  		return;
  
  	usb_anchor_urb(urb, &data->bulk_anchor);

  	usb_mark_last_busy(data->udev);

  
  	err = usb_submit_urb(urb, GFP_ATOMIC);
  	if (err < 0) {

  		if (err != -EPERM)
  			BT_ERR("%s urb %p failed to resubmit (%d)",

  						hdev->name, urb, -err);
  		usb_unanchor_urb(urb);
  	}
  }

  static int btusb_submit_bulk_urb(struct hci_dev *hdev, gfp_t mem_flags)

  {
  	struct btusb_data *data = hdev->driver_data;
  	struct urb *urb;
  	unsigned char *buf;
  	unsigned int pipe;

  	int err, size = HCI_MAX_FRAME_SIZE;

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

  	if (!data->bulk_rx_ep)
  		return -ENODEV;

  	urb = usb_alloc_urb(0, mem_flags);

  	if (!urb)
  		return -ENOMEM;

  	buf = kmalloc(size, mem_flags);

  	if (!buf) {
  		usb_free_urb(urb);
  		return -ENOMEM;
  	}
  
  	pipe = usb_rcvbulkpipe(data->udev, data->bulk_rx_ep->bEndpointAddress);
  
  	usb_fill_bulk_urb(urb, data->udev, pipe,
  					buf, size, btusb_bulk_complete, hdev);
  
  	urb->transfer_flags |= URB_FREE_BUFFER;

  	usb_mark_last_busy(data->udev);

  	usb_anchor_urb(urb, &data->bulk_anchor);

  	err = usb_submit_urb(urb, mem_flags);

  	if (err < 0) {
  		BT_ERR("%s urb %p submission failed (%d)",
  						hdev->name, urb, -err);
  		usb_unanchor_urb(urb);

  	}
  
  	usb_free_urb(urb);
  
  	return err;
  }

  static void btusb_isoc_complete(struct urb *urb)
  {
  	struct hci_dev *hdev = urb->context;
  	struct btusb_data *data = hdev->driver_data;
  	int i, 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) {
  		for (i = 0; i < urb->number_of_packets; i++) {
  			unsigned int offset = urb->iso_frame_desc[i].offset;
  			unsigned int length = urb->iso_frame_desc[i].actual_length;
  
  			if (urb->iso_frame_desc[i].status)
  				continue;
  
  			hdev->stat.byte_rx += length;
  
  			if (hci_recv_fragment(hdev, HCI_SCODATA_PKT,
  						urb->transfer_buffer + offset,
  								length) < 0) {
  				BT_ERR("%s corrupted SCO packet", hdev->name);
  				hdev->stat.err_rx++;
  			}
  		}
  	}
  
  	if (!test_bit(BTUSB_ISOC_RUNNING, &data->flags))
  		return;
  
  	usb_anchor_urb(urb, &data->isoc_anchor);
  
  	err = usb_submit_urb(urb, GFP_ATOMIC);
  	if (err < 0) {

  		if (err != -EPERM)
  			BT_ERR("%s urb %p failed to resubmit (%d)",

  						hdev->name, urb, -err);
  		usb_unanchor_urb(urb);
  	}
  }
  
  static void inline __fill_isoc_descriptor(struct urb *urb, int len, int mtu)
  {
  	int i, offset = 0;
  
  	BT_DBG("len %d mtu %d", len, mtu);
  
  	for (i = 0; i < BTUSB_MAX_ISOC_FRAMES && len >= mtu;
  					i++, offset += mtu, len -= mtu) {
  		urb->iso_frame_desc[i].offset = offset;
  		urb->iso_frame_desc[i].length = mtu;
  	}
  
  	if (len && i < BTUSB_MAX_ISOC_FRAMES) {
  		urb->iso_frame_desc[i].offset = offset;
  		urb->iso_frame_desc[i].length = len;
  		i++;
  	}
  
  	urb->number_of_packets = i;
  }

  static int btusb_submit_isoc_urb(struct hci_dev *hdev, gfp_t mem_flags)

  {
  	struct btusb_data *data = hdev->driver_data;
  	struct urb *urb;
  	unsigned char *buf;
  	unsigned int pipe;
  	int err, size;
  
  	BT_DBG("%s", hdev->name);
  
  	if (!data->isoc_rx_ep)
  		return -ENODEV;

  	urb = usb_alloc_urb(BTUSB_MAX_ISOC_FRAMES, mem_flags);

  	if (!urb)
  		return -ENOMEM;
  
  	size = le16_to_cpu(data->isoc_rx_ep->wMaxPacketSize) *
  						BTUSB_MAX_ISOC_FRAMES;

  	buf = kmalloc(size, mem_flags);

  	if (!buf) {
  		usb_free_urb(urb);
  		return -ENOMEM;
  	}
  
  	pipe = usb_rcvisocpipe(data->udev, data->isoc_rx_ep->bEndpointAddress);
  
  	urb->dev      = data->udev;
  	urb->pipe     = pipe;
  	urb->context  = hdev;
  	urb->complete = btusb_isoc_complete;
  	urb->interval = data->isoc_rx_ep->bInterval;
  
  	urb->transfer_flags  = URB_FREE_BUFFER | URB_ISO_ASAP;
  	urb->transfer_buffer = buf;
  	urb->transfer_buffer_length = size;
  
  	__fill_isoc_descriptor(urb, size,
  			le16_to_cpu(data->isoc_rx_ep->wMaxPacketSize));
  
  	usb_anchor_urb(urb, &data->isoc_anchor);

  	err = usb_submit_urb(urb, mem_flags);

  	if (err < 0) {
  		BT_ERR("%s urb %p submission failed (%d)",
  						hdev->name, urb, -err);
  		usb_unanchor_urb(urb);

  	}
  
  	usb_free_urb(urb);
  
  	return err;
  }

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

  	struct btusb_data *data = hdev->driver_data;
  
  	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:
  	spin_lock(&data->txlock);
  	data->tx_in_flight--;
  	spin_unlock(&data->txlock);
  
  	kfree(urb->setup_packet);
  
  	kfree_skb(skb);
  }
  
  static void btusb_isoc_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 int btusb_open(struct hci_dev *hdev)
  {
  	struct btusb_data *data = hdev->driver_data;
  	int err;
  
  	BT_DBG("%s", hdev->name);

  	err = usb_autopm_get_interface(data->intf);
  	if (err < 0)
  		return err;
  
  	data->intf->needs_remote_wakeup = 1;

  	if (test_and_set_bit(HCI_RUNNING, &hdev->flags))

  		goto done;

  
  	if (test_and_set_bit(BTUSB_INTR_RUNNING, &data->flags))

  		goto done;

  	err = btusb_submit_intr_urb(hdev, GFP_KERNEL);

  	if (err < 0)
  		goto failed;
  
  	err = btusb_submit_bulk_urb(hdev, GFP_KERNEL);

  	if (err < 0) {

  		usb_kill_anchored_urbs(&data->intr_anchor);
  		goto failed;

  	}

  	set_bit(BTUSB_BULK_RUNNING, &data->flags);
  	btusb_submit_bulk_urb(hdev, GFP_KERNEL);

  done:
  	usb_autopm_put_interface(data->intf);

  	return 0;
  
  failed:
  	clear_bit(BTUSB_INTR_RUNNING, &data->flags);
  	clear_bit(HCI_RUNNING, &hdev->flags);

  	usb_autopm_put_interface(data->intf);

  	return err;
  }

  static void btusb_stop_traffic(struct btusb_data *data)
  {
  	usb_kill_anchored_urbs(&data->intr_anchor);
  	usb_kill_anchored_urbs(&data->bulk_anchor);
  	usb_kill_anchored_urbs(&data->isoc_anchor);
  }

  static int btusb_close(struct hci_dev *hdev)
  {
  	struct btusb_data *data = hdev->driver_data;

  	int err;

  
  	BT_DBG("%s", hdev->name);
  
  	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
  		return 0;

  	cancel_work_sync(&data->work);

  	cancel_work_sync(&data->waker);

  	clear_bit(BTUSB_ISOC_RUNNING, &data->flags);

  	clear_bit(BTUSB_BULK_RUNNING, &data->flags);

  	clear_bit(BTUSB_INTR_RUNNING, &data->flags);

  
  	btusb_stop_traffic(data);
  	err = usb_autopm_get_interface(data->intf);
  	if (err < 0)

  		goto failed;

  
  	data->intf->needs_remote_wakeup = 0;
  	usb_autopm_put_interface(data->intf);

  failed:
  	usb_scuttle_anchored_urbs(&data->deferred);

  	return 0;
  }
  
  static int btusb_flush(struct hci_dev *hdev)
  {
  	struct btusb_data *data = hdev->driver_data;
  
  	BT_DBG("%s", hdev->name);
  
  	usb_kill_anchored_urbs(&data->tx_anchor);
  
  	return 0;
  }
  
  static int btusb_send_frame(struct sk_buff *skb)
  {
  	struct hci_dev *hdev = (struct hci_dev *) skb->dev;
  	struct btusb_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;
  
  	switch (bt_cb(skb)->pkt_type) {
  	case HCI_COMMAND_PKT:
  		urb = usb_alloc_urb(0, GFP_ATOMIC);
  		if (!urb)
  			return -ENOMEM;
  
  		dr = kmalloc(sizeof(*dr), GFP_ATOMIC);
  		if (!dr) {
  			usb_free_urb(urb);
  			return -ENOMEM;
  		}

  		dr->bRequestType = data->cmdreq_type;

  		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, btusb_tx_complete, skb);
  
  		hdev->stat.cmd_tx++;
  		break;
  
  	case HCI_ACLDATA_PKT:

  		if (!data->bulk_tx_ep || hdev->conn_hash.acl_num < 1)
  			return -ENODEV;

  		urb = usb_alloc_urb(0, GFP_ATOMIC);
  		if (!urb)
  			return -ENOMEM;
  
  		pipe = usb_sndbulkpipe(data->udev,
  					data->bulk_tx_ep->bEndpointAddress);
  
  		usb_fill_bulk_urb(urb, data->udev, pipe,
  				skb->data, skb->len, btusb_tx_complete, skb);
  
  		hdev->stat.acl_tx++;
  		break;
  
  	case HCI_SCODATA_PKT:

  		if (!data->isoc_tx_ep || hdev->conn_hash.sco_num < 1)
  			return -ENODEV;
  
  		urb = usb_alloc_urb(BTUSB_MAX_ISOC_FRAMES, GFP_ATOMIC);
  		if (!urb)
  			return -ENOMEM;
  
  		pipe = usb_sndisocpipe(data->udev,
  					data->isoc_tx_ep->bEndpointAddress);
  
  		urb->dev      = data->udev;
  		urb->pipe     = pipe;
  		urb->context  = skb;

  		urb->complete = btusb_isoc_tx_complete;

  		urb->interval = data->isoc_tx_ep->bInterval;
  
  		urb->transfer_flags  = URB_ISO_ASAP;
  		urb->transfer_buffer = skb->data;
  		urb->transfer_buffer_length = skb->len;
  
  		__fill_isoc_descriptor(urb, skb->len,
  				le16_to_cpu(data->isoc_tx_ep->wMaxPacketSize));

  		hdev->stat.sco_tx++;

  		goto skip_waking;

  
  	default:
  		return -EILSEQ;
  	}

  	err = inc_tx(data);
  	if (err) {
  		usb_anchor_urb(urb, &data->deferred);
  		schedule_work(&data->waker);
  		err = 0;
  		goto done;
  	}
  
  skip_waking:

  	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);

  	} else {
  		usb_mark_last_busy(data->udev);

  	}
  
  	usb_free_urb(urb);

  done:

  	return err;
  }
  
  static void btusb_destruct(struct hci_dev *hdev)
  {
  	struct btusb_data *data = hdev->driver_data;
  
  	BT_DBG("%s", hdev->name);
  
  	kfree(data);
  }
  
  static void btusb_notify(struct hci_dev *hdev, unsigned int evt)
  {
  	struct btusb_data *data = hdev->driver_data;
  
  	BT_DBG("%s evt %d", hdev->name, evt);

  	if (hdev->conn_hash.sco_num != data->sco_num) {
  		data->sco_num = hdev->conn_hash.sco_num;
  		schedule_work(&data->work);

  	}

  }

  static int inline __set_isoc_interface(struct hci_dev *hdev, int altsetting)
  {
  	struct btusb_data *data = hdev->driver_data;
  	struct usb_interface *intf = data->isoc;
  	struct usb_endpoint_descriptor *ep_desc;
  	int i, err;
  
  	if (!data->isoc)
  		return -ENODEV;
  
  	err = usb_set_interface(data->udev, 1, altsetting);
  	if (err < 0) {
  		BT_ERR("%s setting interface failed (%d)", hdev->name, -err);
  		return err;
  	}
  
  	data->isoc_altsetting = altsetting;
  
  	data->isoc_tx_ep = NULL;
  	data->isoc_rx_ep = NULL;
  
  	for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {
  		ep_desc = &intf->cur_altsetting->endpoint[i].desc;
  
  		if (!data->isoc_tx_ep && usb_endpoint_is_isoc_out(ep_desc)) {
  			data->isoc_tx_ep = ep_desc;
  			continue;
  		}
  
  		if (!data->isoc_rx_ep && usb_endpoint_is_isoc_in(ep_desc)) {
  			data->isoc_rx_ep = ep_desc;
  			continue;
  		}
  	}
  
  	if (!data->isoc_tx_ep || !data->isoc_rx_ep) {
  		BT_ERR("%s invalid SCO descriptors", hdev->name);
  		return -ENODEV;
  	}
  
  	return 0;
  }

  static void btusb_work(struct work_struct *work)
  {
  	struct btusb_data *data = container_of(work, struct btusb_data, work);
  	struct hci_dev *hdev = data->hdev;

  	int err;

  	if (hdev->conn_hash.sco_num > 0) {

  		if (!test_bit(BTUSB_DID_ISO_RESUME, &data->flags)) {

  			err = usb_autopm_get_interface(data->isoc);
  			if (err < 0) {
  				clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
  				usb_kill_anchored_urbs(&data->isoc_anchor);
  				return;
  			}

  			set_bit(BTUSB_DID_ISO_RESUME, &data->flags);

  		}

  		if (data->isoc_altsetting != 2) {
  			clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
  			usb_kill_anchored_urbs(&data->isoc_anchor);
  
  			if (__set_isoc_interface(hdev, 2) < 0)
  				return;
  		}
  
  		if (!test_and_set_bit(BTUSB_ISOC_RUNNING, &data->flags)) {

  			if (btusb_submit_isoc_urb(hdev, GFP_KERNEL) < 0)

  				clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
  			else

  				btusb_submit_isoc_urb(hdev, GFP_KERNEL);

  		}
  	} else {
  		clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
  		usb_kill_anchored_urbs(&data->isoc_anchor);
  
  		__set_isoc_interface(hdev, 0);

  		if (test_and_clear_bit(BTUSB_DID_ISO_RESUME, &data->flags))

  			usb_autopm_put_interface(data->isoc);

  	}
  }

  static void btusb_waker(struct work_struct *work)
  {
  	struct btusb_data *data = container_of(work, struct btusb_data, waker);
  	int err;
  
  	err = usb_autopm_get_interface(data->intf);
  	if (err < 0)
  		return;
  
  	usb_autopm_put_interface(data->intf);
  }

  static int btusb_probe(struct usb_interface *intf,
  				const struct usb_device_id *id)
  {
  	struct usb_endpoint_descriptor *ep_desc;
  	struct btusb_data *data;
  	struct hci_dev *hdev;
  	int i, err;
  
  	BT_DBG("intf %p id %p", intf, id);

  	/* interface numbers are hardcoded in the spec */

  	if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
  		return -ENODEV;
  
  	if (!id->driver_info) {
  		const struct usb_device_id *match;
  		match = usb_match_id(intf, blacklist_table);
  		if (match)
  			id = match;
  	}

  	if (id->driver_info == BTUSB_IGNORE)
  		return -ENODEV;
  
  	if (ignore_dga && id->driver_info & BTUSB_DIGIANSWER)
  		return -ENODEV;
  
  	if (ignore_csr && id->driver_info & BTUSB_CSR)
  		return -ENODEV;
  
  	if (ignore_sniffer && id->driver_info & BTUSB_SNIFFER)
  		return -ENODEV;

  	data = kzalloc(sizeof(*data), GFP_KERNEL);
  	if (!data)
  		return -ENOMEM;
  
  	for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {
  		ep_desc = &intf->cur_altsetting->endpoint[i].desc;
  
  		if (!data->intr_ep && usb_endpoint_is_int_in(ep_desc)) {
  			data->intr_ep = ep_desc;
  			continue;
  		}
  
  		if (!data->bulk_tx_ep && usb_endpoint_is_bulk_out(ep_desc)) {
  			data->bulk_tx_ep = ep_desc;
  			continue;
  		}
  
  		if (!data->bulk_rx_ep && usb_endpoint_is_bulk_in(ep_desc)) {
  			data->bulk_rx_ep = ep_desc;
  			continue;
  		}
  	}
  
  	if (!data->intr_ep || !data->bulk_tx_ep || !data->bulk_rx_ep) {
  		kfree(data);
  		return -ENODEV;
  	}

  	data->cmdreq_type = USB_TYPE_CLASS;

  	data->udev = interface_to_usbdev(intf);

  	data->intf = intf;

  
  	spin_lock_init(&data->lock);
  
  	INIT_WORK(&data->work, btusb_work);

  	INIT_WORK(&data->waker, btusb_waker);
  	spin_lock_init(&data->txlock);

  
  	init_usb_anchor(&data->tx_anchor);
  	init_usb_anchor(&data->intr_anchor);
  	init_usb_anchor(&data->bulk_anchor);

  	init_usb_anchor(&data->isoc_anchor);

  	init_usb_anchor(&data->deferred);

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

  	hdev->bus = HCI_USB;

  	hdev->driver_data = data;
  
  	data->hdev = hdev;
  
  	SET_HCIDEV_DEV(hdev, &intf->dev);
  
  	hdev->open     = btusb_open;
  	hdev->close    = btusb_close;
  	hdev->flush    = btusb_flush;
  	hdev->send     = btusb_send_frame;
  	hdev->destruct = btusb_destruct;
  	hdev->notify   = btusb_notify;
  
  	hdev->owner = THIS_MODULE;

  	/* Interface numbers are hardcoded in the specification */

  	data->isoc = usb_ifnum_to_if(data->udev, 1);

  	if (!reset)
  		set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);

  
  	if (force_scofix || id->driver_info & BTUSB_WRONG_SCO_MTU) {
  		if (!disable_scofix)
  			set_bit(HCI_QUIRK_FIXUP_BUFFER_SIZE, &hdev->quirks);
  	}

  	if (id->driver_info & BTUSB_BROKEN_ISOC)
  		data->isoc = NULL;

  	if (id->driver_info & BTUSB_DIGIANSWER) {
  		data->cmdreq_type = USB_TYPE_VENDOR;
  		set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);
  	}
  
  	if (id->driver_info & BTUSB_CSR) {
  		struct usb_device *udev = data->udev;
  
  		/* Old firmware would otherwise execute USB reset */
  		if (le16_to_cpu(udev->descriptor.bcdDevice) < 0x117)
  			set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);
  	}

  	if (id->driver_info & BTUSB_SNIFFER) {

  		struct usb_device *udev = data->udev;

  		/* New sniffer firmware has crippled HCI interface */

  		if (le16_to_cpu(udev->descriptor.bcdDevice) > 0x997)
  			set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);

  
  		data->isoc = NULL;

  	}
  
  	if (id->driver_info & BTUSB_BCM92035) {
  		unsigned char cmd[] = { 0x3b, 0xfc, 0x01, 0x00 };
  		struct sk_buff *skb;
  
  		skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
  		if (skb) {
  			memcpy(skb_put(skb, sizeof(cmd)), cmd, sizeof(cmd));
  			skb_queue_tail(&hdev->driver_init, skb);
  		}
  	}

  	if (data->isoc) {
  		err = usb_driver_claim_interface(&btusb_driver,

  							data->isoc, data);

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

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

  	usb_enable_autosuspend(interface_to_usbdev(intf));

  	return 0;
  }
  
  static void btusb_disconnect(struct usb_interface *intf)
  {
  	struct btusb_data *data = usb_get_intfdata(intf);
  	struct hci_dev *hdev;
  
  	BT_DBG("intf %p", intf);
  
  	if (!data)
  		return;
  
  	hdev = data->hdev;

  	__hci_dev_hold(hdev);

  	usb_set_intfdata(data->intf, NULL);
  
  	if (data->isoc)
  		usb_set_intfdata(data->isoc, NULL);

  
  	hci_unregister_dev(hdev);

  	if (intf == data->isoc)
  		usb_driver_release_interface(&btusb_driver, data->intf);
  	else if (data->isoc)
  		usb_driver_release_interface(&btusb_driver, data->isoc);
  
  	__hci_dev_put(hdev);

  	hci_free_dev(hdev);
  }

  #ifdef CONFIG_PM

  static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
  {
  	struct btusb_data *data = usb_get_intfdata(intf);
  
  	BT_DBG("intf %p", intf);
  
  	if (data->suspend_count++)
  		return 0;

  	spin_lock_irq(&data->txlock);

  	if (!((message.event & PM_EVENT_AUTO) && data->tx_in_flight)) {

  		set_bit(BTUSB_SUSPENDING, &data->flags);
  		spin_unlock_irq(&data->txlock);
  	} else {
  		spin_unlock_irq(&data->txlock);
  		data->suspend_count--;
  		return -EBUSY;
  	}

  	cancel_work_sync(&data->work);

  	btusb_stop_traffic(data);

  	usb_kill_anchored_urbs(&data->tx_anchor);

  	return 0;
  }

  static void play_deferred(struct btusb_data *data)
  {
  	struct urb *urb;
  	int err;
  
  	while ((urb = usb_get_from_anchor(&data->deferred))) {
  		err = usb_submit_urb(urb, GFP_ATOMIC);
  		if (err < 0)
  			break;
  
  		data->tx_in_flight++;
  	}
  	usb_scuttle_anchored_urbs(&data->deferred);
  }

  static int btusb_resume(struct usb_interface *intf)
  {
  	struct btusb_data *data = usb_get_intfdata(intf);
  	struct hci_dev *hdev = data->hdev;

  	int err = 0;

  
  	BT_DBG("intf %p", intf);
  
  	if (--data->suspend_count)
  		return 0;
  
  	if (!test_bit(HCI_RUNNING, &hdev->flags))

  		goto done;

  
  	if (test_bit(BTUSB_INTR_RUNNING, &data->flags)) {
  		err = btusb_submit_intr_urb(hdev, GFP_NOIO);
  		if (err < 0) {
  			clear_bit(BTUSB_INTR_RUNNING, &data->flags);

  			goto failed;

  		}
  	}
  
  	if (test_bit(BTUSB_BULK_RUNNING, &data->flags)) {

  		err = btusb_submit_bulk_urb(hdev, GFP_NOIO);
  		if (err < 0) {

  			clear_bit(BTUSB_BULK_RUNNING, &data->flags);

  			goto failed;
  		}
  
  		btusb_submit_bulk_urb(hdev, GFP_NOIO);

  	}
  
  	if (test_bit(BTUSB_ISOC_RUNNING, &data->flags)) {
  		if (btusb_submit_isoc_urb(hdev, GFP_NOIO) < 0)
  			clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
  		else
  			btusb_submit_isoc_urb(hdev, GFP_NOIO);
  	}

  	spin_lock_irq(&data->txlock);
  	play_deferred(data);
  	clear_bit(BTUSB_SUSPENDING, &data->flags);
  	spin_unlock_irq(&data->txlock);
  	schedule_work(&data->work);

  	return 0;

  
  failed:
  	usb_scuttle_anchored_urbs(&data->deferred);
  done:
  	spin_lock_irq(&data->txlock);
  	clear_bit(BTUSB_SUSPENDING, &data->flags);
  	spin_unlock_irq(&data->txlock);
  
  	return err;

  }

  #endif

  static struct usb_driver btusb_driver = {
  	.name		= "btusb",
  	.probe		= btusb_probe,
  	.disconnect	= btusb_disconnect,

  #ifdef CONFIG_PM

  	.suspend	= btusb_suspend,
  	.resume		= btusb_resume,

  #endif

  	.id_table	= btusb_table,

  	.supports_autosuspend = 1,

  };
  
  static int __init btusb_init(void)
  {
  	BT_INFO("Generic Bluetooth USB driver ver %s", VERSION);
  
  	return usb_register(&btusb_driver);
  }
  
  static void __exit btusb_exit(void)
  {
  	usb_deregister(&btusb_driver);
  }
  
  module_init(btusb_init);
  module_exit(btusb_exit);

  module_param(ignore_dga, bool, 0644);
  MODULE_PARM_DESC(ignore_dga, "Ignore devices with id 08fd:0001");
  
  module_param(ignore_csr, bool, 0644);
  MODULE_PARM_DESC(ignore_csr, "Ignore devices with id 0a12:0001");
  
  module_param(ignore_sniffer, bool, 0644);
  MODULE_PARM_DESC(ignore_sniffer, "Ignore devices with id 0a12:0002");
  
  module_param(disable_scofix, bool, 0644);
  MODULE_PARM_DESC(disable_scofix, "Disable fixup of wrong SCO buffer size");
  
  module_param(force_scofix, bool, 0644);
  MODULE_PARM_DESC(force_scofix, "Force fixup of wrong SCO buffers size");
  
  module_param(reset, bool, 0644);
  MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");

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