btusb.c

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/*
 *
 *  Generic Bluetooth USB driver
 *
 *  Copyright (C) 2005-2008  Marcel Holtmann <[email protected]>
 *
 *
 *  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/module.h>
#include <linux/usb.h>

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

#define VERSION "0.6"

static bool ignore_dga;
static bool ignore_csr;
static bool ignore_sniffer;
static bool disable_scofix;
static bool force_scofix;

static bool 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
#define BTUSB_ATH3012       0x80

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

    /* Apple-specific (Broadcom) devices */
    { USB_VENDOR_AND_INTERFACE_INFO(0x05ac, 0xff, 0x01, 0x01) },

    /* Broadcom SoftSailing reporting vendor specific */
    { USB_DEVICE(0x0a5c, 0x21e1) },

    /* 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) },

    /* Apple MacBookAir4,1 */
    { USB_DEVICE(0x05ac, 0x821f) },

    /* Apple MacBookPro8,2 */
    { USB_DEVICE(0x05ac, 0x821a) },

    /* Apple MacMini5,1 */
    { USB_DEVICE(0x05ac, 0x8281) },

    /* 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) },

    /* Broadcom BCM20702A0 */
    { USB_DEVICE(0x04ca, 0x2003) },
    { USB_DEVICE(0x0489, 0xe042) },
    { USB_DEVICE(0x413c, 0x8197) },

    /* Foxconn - Hon Hai */
    { USB_VENDOR_AND_INTERFACE_INFO(0x0489, 0xff, 0x01, 0x01) },

    /*Broadcom devices with vendor specific id */
    { USB_VENDOR_AND_INTERFACE_INFO(0x0a5c, 0xff, 0x01, 0x01) },

    { } /* 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 },
    { USB_DEVICE(0x0cf3, 0xe019), .driver_info = BTUSB_IGNORE },
    { USB_DEVICE(0x13d3, 0x3304), .driver_info = BTUSB_IGNORE },
    { USB_DEVICE(0x0930, 0x0215), .driver_info = BTUSB_IGNORE },
    { USB_DEVICE(0x0489, 0xe03d), .driver_info = BTUSB_IGNORE },
    { USB_DEVICE(0x0489, 0xe027), .driver_info = BTUSB_IGNORE },

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

    /* Atheros 3012 with sflash firmware */
    { USB_DEVICE(0x0cf3, 0x3004), .driver_info = BTUSB_ATH3012 },
    { USB_DEVICE(0x0cf3, 0x311d), .driver_info = BTUSB_ATH3012 },
    { USB_DEVICE(0x13d3, 0x3375), .driver_info = BTUSB_ATH3012 },
    { USB_DEVICE(0x04ca, 0x3005), .driver_info = BTUSB_ATH3012 },
    { USB_DEVICE(0x13d3, 0x3362), .driver_info = BTUSB_ATH3012 },
    { USB_DEVICE(0x0cf3, 0xe004), .driver_info = BTUSB_ATH3012 },
    { USB_DEVICE(0x0930, 0x0219), .driver_info = BTUSB_ATH3012 },
    { USB_DEVICE(0x0489, 0xe057), .driver_info = BTUSB_ATH3012 },

    /* Atheros AR5BBU12 with sflash firmware */
    { USB_DEVICE(0x0489, 0xe02c), .driver_info = BTUSB_IGNORE },

    /* Atheros AR5BBU12 with sflash firmware */
    { USB_DEVICE(0x0489, 0xe03c), .driver_info = BTUSB_ATH3012 },
    { USB_DEVICE(0x0489, 0xe036), .driver_info = BTUSB_ATH3012 },

    /* 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 = hci_get_drvdata(hdev);
    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) {
        /* -EPERM: urb is being killed;
         * -ENODEV: device got disconnected */
        if (err != -EPERM && err != -ENODEV)
            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 = hci_get_drvdata(hdev);
    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) {
        if (err != -EPERM && err != -ENODEV)
            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 = hci_get_drvdata(hdev);
    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) {
        /* -EPERM: urb is being killed;
         * -ENODEV: device got disconnected */
        if (err != -EPERM && err != -ENODEV)
            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 = hci_get_drvdata(hdev);
    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) {
        if (err != -EPERM && err != -ENODEV)
            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 = hci_get_drvdata(hdev);
    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) {
        /* -EPERM: urb is being killed;
         * -ENODEV: device got disconnected */
        if (err != -EPERM && err != -ENODEV)
            BT_ERR("%s urb %p failed to resubmit (%d)",
                        hdev->name, urb, -err);
        usb_unanchor_urb(urb);
    }
}

static inline void __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 = hci_get_drvdata(hdev);
    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);

    usb_fill_int_urb(urb, data->udev, pipe, buf, size, btusb_isoc_complete,
                hdev, data->isoc_rx_ep->bInterval);

    urb->transfer_flags  = URB_FREE_BUFFER | URB_ISO_ASAP;

    __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) {
        if (err != -EPERM && err != -ENODEV)
            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 = hci_get_drvdata(hdev);

    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 = hci_get_drvdata(hdev);
    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 = hci_get_drvdata(hdev);
    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 = hci_get_drvdata(hdev);

    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 = hci_get_drvdata(hdev);
    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)
            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);

        usb_fill_int_urb(urb, data->udev, pipe,
                skb->data, skb->len, btusb_isoc_tx_complete,
                skb, data->isoc_tx_ep->bInterval);

        urb->transfer_flags  = URB_ISO_ASAP;

        __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) {
        if (err != -EPERM && err != -ENODEV)
            BT_ERR("%s urb %p submission failed (%d)",
                        hdev->name, urb, -err);
        kfree(urb->setup_packet);
        usb_unanchor_urb(urb);
    } else {
        usb_mark_last_busy(data->udev);
    }

done:
    usb_free_urb(urb);
    return err;
}

static void btusb_notify(struct hci_dev *hdev, unsigned int evt)
{
    struct btusb_data *data = hci_get_drvdata(hdev);

    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 inline int __set_isoc_interface(struct hci_dev *hdev, int altsetting)
{
    struct btusb_data *data = hci_get_drvdata(hdev);
    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 new_alts;
    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 ? data->isoc : data->intf);
            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 (hdev->voice_setting & 0x0020) {
            static const int alts[3] = { 2, 4, 5 };
            new_alts = alts[hdev->conn_hash.sco_num - 1];
        } else {
            new_alts = hdev->conn_hash.sco_num;
        }

        if (data->isoc_altsetting != new_alts) {
            clear_bit(BTUSB_ISOC_RUNNING, &data->flags);
            usb_kill_anchored_urbs(&data->isoc_anchor);

            if (__set_isoc_interface(hdev, new_alts) < 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 ? data->isoc : data->intf);
    }
}

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;

    if (id->driver_info & BTUSB_ATH3012) {
        struct usb_device *udev = interface_to_usbdev(intf);

        /* Old firmware would otherwise let ath3k driver load
         * patch and sysconfig files */
        if (le16_to_cpu(udev->descriptor.bcdDevice) <= 0x0001)
            return -ENODEV;
    }

    data = devm_kzalloc(&intf->dev, 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)
        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)
        return -ENOMEM;

    hdev->bus = HCI_USB;
    hci_set_drvdata(hdev, 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->notify   = btusb_notify;

    /* Interface numbers are hardcoded in the specification */
    data->isoc = usb_ifnum_to_if(data->udev, 1);

    if (!reset)
        set_bit(HCI_QUIRK_RESET_ON_CLOSE, &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_RESET_ON_CLOSE, &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_RESET_ON_CLOSE, &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);
            return err;
        }
    }

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

    usb_set_intfdata(intf, data);

    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;
    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_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 (!(PMSG_IS_AUTO(message) && 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,
    .disable_hub_initiated_lpm = 1,
};

module_usb_driver(btusb_driver);

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 <[email protected]>");
MODULE_DESCRIPTION("Generic Bluetooth USB driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");