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) 2004-2005 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/config.h>
27 #include <linux/module.h>
29 #include <linux/kernel.h>
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/types.h>
33 #include <linux/errno.h>
34 #include <linux/sched.h>
35 #include <linux/poll.h>
37 #include <linux/skbuff.h>
38 #include <linux/miscdevice.h>
40 #include <net/bluetooth/bluetooth.h>
41 #include <net/bluetooth/hci_core.h>
43 #ifndef CONFIG_BT_HCIVHCI_DEBUG
50 static int minor = MISC_DYNAMIC_MINOR;
57 wait_queue_head_t read_wait;
58 struct sk_buff_head readq;
60 struct fasync_struct *fasync;
63 #define VHCI_FASYNC 0x0010
65 static struct miscdevice vhci_miscdev;
67 static int vhci_open_dev(struct hci_dev *hdev)
69 set_bit(HCI_RUNNING, &hdev->flags);
74 static int vhci_close_dev(struct hci_dev *hdev)
76 struct vhci_data *vhci = hdev->driver_data;
78 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
81 skb_queue_purge(&vhci->readq);
86 static int vhci_flush(struct hci_dev *hdev)
88 struct vhci_data *vhci = hdev->driver_data;
90 skb_queue_purge(&vhci->readq);
95 static int vhci_send_frame(struct sk_buff *skb)
97 struct hci_dev* hdev = (struct hci_dev *) skb->dev;
98 struct vhci_data *vhci;
101 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
105 if (!test_bit(HCI_RUNNING, &hdev->flags))
108 vhci = hdev->driver_data;
110 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
111 skb_queue_tail(&vhci->readq, skb);
113 if (vhci->flags & VHCI_FASYNC)
114 kill_fasync(&vhci->fasync, SIGIO, POLL_IN);
116 wake_up_interruptible(&vhci->read_wait);
121 static void vhci_destruct(struct hci_dev *hdev)
123 kfree(hdev->driver_data);
126 static inline ssize_t vhci_get_user(struct vhci_data *vhci,
127 const char __user *buf, size_t count)
131 if (count > HCI_MAX_FRAME_SIZE)
134 skb = bt_skb_alloc(count, GFP_KERNEL);
138 if (copy_from_user(skb_put(skb, count), buf, count)) {
143 skb->dev = (void *) vhci->hdev;
144 bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
152 static inline ssize_t vhci_put_user(struct vhci_data *vhci,
153 struct sk_buff *skb, char __user *buf, int count)
155 char __user *ptr = buf;
158 len = min_t(unsigned int, skb->len, count);
160 if (copy_to_user(ptr, skb->data, len))
165 vhci->hdev->stat.byte_tx += len;
167 switch (bt_cb(skb)->pkt_type) {
168 case HCI_COMMAND_PKT:
169 vhci->hdev->stat.cmd_tx++;
172 case HCI_ACLDATA_PKT:
173 vhci->hdev->stat.acl_tx++;
176 case HCI_SCODATA_PKT:
177 vhci->hdev->stat.cmd_tx++;
184 static loff_t vhci_llseek(struct file * file, loff_t offset, int origin)
189 static ssize_t vhci_read(struct file * file, char __user * buf, size_t count, loff_t *pos)
191 DECLARE_WAITQUEUE(wait, current);
192 struct vhci_data *vhci = file->private_data;
196 add_wait_queue(&vhci->read_wait, &wait);
198 set_current_state(TASK_INTERRUPTIBLE);
200 skb = skb_dequeue(&vhci->readq);
202 if (file->f_flags & O_NONBLOCK) {
207 if (signal_pending(current)) {
216 if (access_ok(VERIFY_WRITE, buf, count))
217 ret = vhci_put_user(vhci, skb, buf, count);
224 set_current_state(TASK_RUNNING);
225 remove_wait_queue(&vhci->read_wait, &wait);
230 static ssize_t vhci_write(struct file *file,
231 const char __user *buf, size_t count, loff_t *pos)
233 struct vhci_data *vhci = file->private_data;
235 if (!access_ok(VERIFY_READ, buf, count))
238 return vhci_get_user(vhci, buf, count);
241 static unsigned int vhci_poll(struct file *file, poll_table *wait)
243 struct vhci_data *vhci = file->private_data;
245 poll_wait(file, &vhci->read_wait, wait);
247 if (!skb_queue_empty(&vhci->readq))
248 return POLLIN | POLLRDNORM;
250 return POLLOUT | POLLWRNORM;
253 static int vhci_ioctl(struct inode *inode, struct file *file,
254 unsigned int cmd, unsigned long arg)
259 static int vhci_open(struct inode *inode, struct file *file)
261 struct vhci_data *vhci;
262 struct hci_dev *hdev;
264 vhci = kmalloc(sizeof(struct vhci_data), GFP_KERNEL);
268 memset(vhci, 0, sizeof(struct vhci_data));
270 skb_queue_head_init(&vhci->readq);
271 init_waitqueue_head(&vhci->read_wait);
273 hdev = hci_alloc_dev();
281 hdev->type = HCI_VHCI;
282 hdev->driver_data = vhci;
283 SET_HCIDEV_DEV(hdev, vhci_miscdev.dev);
285 hdev->open = vhci_open_dev;
286 hdev->close = vhci_close_dev;
287 hdev->flush = vhci_flush;
288 hdev->send = vhci_send_frame;
289 hdev->destruct = vhci_destruct;
291 hdev->owner = THIS_MODULE;
293 if (hci_register_dev(hdev) < 0) {
294 BT_ERR("Can't register HCI device");
300 file->private_data = vhci;
302 return nonseekable_open(inode, file);
305 static int vhci_release(struct inode *inode, struct file *file)
307 struct vhci_data *vhci = file->private_data;
308 struct hci_dev *hdev = vhci->hdev;
310 if (hci_unregister_dev(hdev) < 0) {
311 BT_ERR("Can't unregister HCI device %s", hdev->name);
316 file->private_data = NULL;
321 static int vhci_fasync(int fd, struct file *file, int on)
323 struct vhci_data *vhci = file->private_data;
326 err = fasync_helper(fd, file, on, &vhci->fasync);
331 vhci->flags |= VHCI_FASYNC;
333 vhci->flags &= ~VHCI_FASYNC;
338 static struct file_operations vhci_fops = {
339 .owner = THIS_MODULE,
340 .llseek = vhci_llseek,
346 .release = vhci_release,
347 .fasync = vhci_fasync,
350 static struct miscdevice vhci_miscdev= {
355 static int __init vhci_init(void)
357 BT_INFO("Virtual HCI driver ver %s", VERSION);
359 vhci_miscdev.minor = minor;
361 if (misc_register(&vhci_miscdev) < 0) {
362 BT_ERR("Can't register misc device with minor %d", minor);
369 static void __exit vhci_exit(void)
371 if (misc_deregister(&vhci_miscdev) < 0)
372 BT_ERR("Can't unregister misc device with minor %d", minor);
375 module_init(vhci_init);
376 module_exit(vhci_exit);
378 module_param(minor, int, 0444);
379 MODULE_PARM_DESC(minor, "Miscellaneous minor device number");
381 MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
382 MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
383 MODULE_VERSION(VERSION);
384 MODULE_LICENSE("GPL");