3 * Bluetooth virtual HCI driver
5 * Copyright (C) 2000-2001 Qualcomm Incorporated
6 * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
7 * Copyright (C) 2004-2006 Marcel Holtmann <marcel@holtmann.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/init.h>
30 #include <linux/slab.h>
31 #include <linux/types.h>
32 #include <linux/errno.h>
33 #include <linux/sched.h>
34 #include <linux/poll.h>
36 #include <linux/skbuff.h>
37 #include <linux/miscdevice.h>
39 #include <net/bluetooth/bluetooth.h>
40 #include <net/bluetooth/hci_core.h>
49 wait_queue_head_t read_wait;
50 struct sk_buff_head readq;
53 static int vhci_open_dev(struct hci_dev *hdev)
55 set_bit(HCI_RUNNING, &hdev->flags);
60 static int vhci_close_dev(struct hci_dev *hdev)
62 struct vhci_data *data = hdev->driver_data;
64 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
67 skb_queue_purge(&data->readq);
72 static int vhci_flush(struct hci_dev *hdev)
74 struct vhci_data *data = hdev->driver_data;
76 skb_queue_purge(&data->readq);
81 static int vhci_send_frame(struct sk_buff *skb)
83 struct hci_dev* hdev = (struct hci_dev *) skb->dev;
84 struct vhci_data *data;
87 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
91 if (!test_bit(HCI_RUNNING, &hdev->flags))
94 data = hdev->driver_data;
96 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
97 skb_queue_tail(&data->readq, skb);
99 wake_up_interruptible(&data->read_wait);
104 static void vhci_destruct(struct hci_dev *hdev)
106 kfree(hdev->driver_data);
109 static inline ssize_t vhci_get_user(struct vhci_data *data,
110 const char __user *buf, size_t count)
114 if (count > HCI_MAX_FRAME_SIZE)
117 skb = bt_skb_alloc(count, GFP_KERNEL);
121 if (copy_from_user(skb_put(skb, count), buf, count)) {
126 skb->dev = (void *) data->hdev;
127 bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
135 static inline ssize_t vhci_put_user(struct vhci_data *data,
136 struct sk_buff *skb, char __user *buf, int count)
138 char __user *ptr = buf;
141 len = min_t(unsigned int, skb->len, count);
143 if (copy_to_user(ptr, skb->data, len))
148 data->hdev->stat.byte_tx += len;
150 switch (bt_cb(skb)->pkt_type) {
151 case HCI_COMMAND_PKT:
152 data->hdev->stat.cmd_tx++;
155 case HCI_ACLDATA_PKT:
156 data->hdev->stat.acl_tx++;
159 case HCI_SCODATA_PKT:
160 data->hdev->stat.sco_tx++;
167 static ssize_t vhci_read(struct file *file,
168 char __user *buf, size_t count, loff_t *pos)
170 struct vhci_data *data = file->private_data;
175 skb = skb_dequeue(&data->readq);
177 ret = vhci_put_user(data, skb, buf, count);
179 skb_queue_head(&data->readq, skb);
185 if (file->f_flags & O_NONBLOCK) {
190 ret = wait_event_interruptible(data->read_wait,
191 !skb_queue_empty(&data->readq));
199 static ssize_t vhci_write(struct file *file,
200 const char __user *buf, size_t count, loff_t *pos)
202 struct vhci_data *data = file->private_data;
204 return vhci_get_user(data, buf, count);
207 static unsigned int vhci_poll(struct file *file, poll_table *wait)
209 struct vhci_data *data = file->private_data;
211 poll_wait(file, &data->read_wait, wait);
213 if (!skb_queue_empty(&data->readq))
214 return POLLIN | POLLRDNORM;
216 return POLLOUT | POLLWRNORM;
219 static int vhci_open(struct inode *inode, struct file *file)
221 struct vhci_data *data;
222 struct hci_dev *hdev;
224 data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
228 skb_queue_head_init(&data->readq);
229 init_waitqueue_head(&data->read_wait);
231 hdev = hci_alloc_dev();
239 hdev->bus = HCI_VIRTUAL;
240 hdev->driver_data = data;
242 hdev->open = vhci_open_dev;
243 hdev->close = vhci_close_dev;
244 hdev->flush = vhci_flush;
245 hdev->send = vhci_send_frame;
246 hdev->destruct = vhci_destruct;
248 hdev->owner = THIS_MODULE;
250 if (hci_register_dev(hdev) < 0) {
251 BT_ERR("Can't register HCI device");
257 file->private_data = data;
259 return nonseekable_open(inode, file);
262 static int vhci_release(struct inode *inode, struct file *file)
264 struct vhci_data *data = file->private_data;
265 struct hci_dev *hdev = data->hdev;
267 if (hci_unregister_dev(hdev) < 0) {
268 BT_ERR("Can't unregister HCI device %s", hdev->name);
273 file->private_data = NULL;
278 static const struct file_operations vhci_fops = {
279 .owner = THIS_MODULE,
284 .release = vhci_release,
287 static struct miscdevice vhci_miscdev= {
290 .minor = MISC_DYNAMIC_MINOR,
293 static int __init vhci_init(void)
295 BT_INFO("Virtual HCI driver ver %s", VERSION);
297 return misc_register(&vhci_miscdev);
300 static void __exit vhci_exit(void)
302 misc_deregister(&vhci_miscdev);
305 module_init(vhci_init);
306 module_exit(vhci_exit);
308 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
309 MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
310 MODULE_VERSION(VERSION);
311 MODULE_LICENSE("GPL");