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* Bluetooth virtual HCI driver
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* Copyright (C) 2000-2001 Qualcomm Incorporated
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* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
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* Copyright (C) 2004-2006 Marcel Holtmann <marcel@holtmann.org>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/poll.h>
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#include <linux/skbuff.h>
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#include <linux/miscdevice.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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wait_queue_head_t read_wait;
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struct sk_buff_head readq;
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static int vhci_open_dev(struct hci_dev *hdev)
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set_bit(HCI_RUNNING, &hdev->flags);
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static int vhci_close_dev(struct hci_dev *hdev)
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struct vhci_data *data = hdev->driver_data;
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if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
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skb_queue_purge(&data->readq);
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static int vhci_flush(struct hci_dev *hdev)
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struct vhci_data *data = hdev->driver_data;
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skb_queue_purge(&data->readq);
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static int vhci_send_frame(struct sk_buff *skb)
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struct hci_dev* hdev = (struct hci_dev *) skb->dev;
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struct vhci_data *data;
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BT_ERR("Frame for unknown HCI device (hdev=NULL)");
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if (!test_bit(HCI_RUNNING, &hdev->flags))
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data = hdev->driver_data;
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memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
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skb_queue_tail(&data->readq, skb);
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wake_up_interruptible(&data->read_wait);
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static void vhci_destruct(struct hci_dev *hdev)
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kfree(hdev->driver_data);
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static inline ssize_t vhci_get_user(struct vhci_data *data,
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const char __user *buf, size_t count)
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if (count > HCI_MAX_FRAME_SIZE)
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skb = bt_skb_alloc(count, GFP_KERNEL);
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if (copy_from_user(skb_put(skb, count), buf, count)) {
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skb->dev = (void *) data->hdev;
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bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
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static inline ssize_t vhci_put_user(struct vhci_data *data,
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struct sk_buff *skb, char __user *buf, int count)
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char __user *ptr = buf;
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len = min_t(unsigned int, skb->len, count);
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if (copy_to_user(ptr, skb->data, len))
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data->hdev->stat.byte_tx += len;
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switch (bt_cb(skb)->pkt_type) {
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case HCI_COMMAND_PKT:
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data->hdev->stat.cmd_tx++;
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case HCI_ACLDATA_PKT:
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data->hdev->stat.acl_tx++;
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case HCI_SCODATA_PKT:
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data->hdev->stat.sco_tx++;
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static ssize_t vhci_read(struct file *file,
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char __user *buf, size_t count, loff_t *pos)
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struct vhci_data *data = file->private_data;
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skb = skb_dequeue(&data->readq);
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ret = vhci_put_user(data, skb, buf, count);
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skb_queue_head(&data->readq, skb);
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if (file->f_flags & O_NONBLOCK) {
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ret = wait_event_interruptible(data->read_wait,
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!skb_queue_empty(&data->readq));
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static ssize_t vhci_write(struct file *file,
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const char __user *buf, size_t count, loff_t *pos)
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struct vhci_data *data = file->private_data;
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return vhci_get_user(data, buf, count);
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static unsigned int vhci_poll(struct file *file, poll_table *wait)
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struct vhci_data *data = file->private_data;
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poll_wait(file, &data->read_wait, wait);
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if (!skb_queue_empty(&data->readq))
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return POLLIN | POLLRDNORM;
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return POLLOUT | POLLWRNORM;
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static int vhci_open(struct inode *inode, struct file *file)
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struct vhci_data *data;
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struct hci_dev *hdev;
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data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
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skb_queue_head_init(&data->readq);
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init_waitqueue_head(&data->read_wait);
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hdev = hci_alloc_dev();
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hdev->bus = HCI_VIRTUAL;
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hdev->driver_data = data;
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hdev->open = vhci_open_dev;
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hdev->close = vhci_close_dev;
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hdev->flush = vhci_flush;
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hdev->send = vhci_send_frame;
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hdev->destruct = vhci_destruct;
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hdev->owner = THIS_MODULE;
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if (hci_register_dev(hdev) < 0) {
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BT_ERR("Can't register HCI device");
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file->private_data = data;
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return nonseekable_open(inode, file);
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static int vhci_release(struct inode *inode, struct file *file)
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struct vhci_data *data = file->private_data;
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struct hci_dev *hdev = data->hdev;
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if (hci_unregister_dev(hdev) < 0) {
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BT_ERR("Can't unregister HCI device %s", hdev->name);
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file->private_data = NULL;
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static const struct file_operations vhci_fops = {
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.owner = THIS_MODULE,
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.release = vhci_release,
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static struct miscdevice vhci_miscdev= {
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.minor = MISC_DYNAMIC_MINOR,
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static int __init vhci_init(void)
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BT_INFO("Virtual HCI driver ver %s", VERSION);
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return misc_register(&vhci_miscdev);
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static void __exit vhci_exit(void)
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misc_deregister(&vhci_miscdev);
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module_init(vhci_init);
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module_exit(vhci_exit);
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MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
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MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
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MODULE_VERSION(VERSION);
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MODULE_LICENSE("GPL");