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>
27 #include <asm/unaligned.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>
50 wait_queue_head_t read_wait;
51 struct sk_buff_head readq;
53 struct mutex open_mutex;
54 struct delayed_work open_timeout;
57 static int vhci_open_dev(struct hci_dev *hdev)
62 static int vhci_close_dev(struct hci_dev *hdev)
64 struct vhci_data *data = hci_get_drvdata(hdev);
66 skb_queue_purge(&data->readq);
71 static int vhci_flush(struct hci_dev *hdev)
73 struct vhci_data *data = hci_get_drvdata(hdev);
75 skb_queue_purge(&data->readq);
80 static int vhci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
82 struct vhci_data *data = hci_get_drvdata(hdev);
84 memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
86 mutex_lock(&data->open_mutex);
87 skb_queue_tail(&data->readq, skb);
88 mutex_unlock(&data->open_mutex);
90 wake_up_interruptible(&data->read_wait);
94 static int __vhci_create_device(struct vhci_data *data, __u8 opcode)
103 /* bits 0-1 are dev_type (Primary or AMP) */
104 dev_type = opcode & 0x03;
106 if (dev_type != HCI_PRIMARY && dev_type != HCI_AMP)
109 /* bits 2-5 are reserved (must be zero) */
113 skb = bt_skb_alloc(4, GFP_KERNEL);
117 hdev = hci_alloc_dev();
125 hdev->bus = HCI_VIRTUAL;
126 hdev->dev_type = dev_type;
127 hci_set_drvdata(hdev, data);
129 hdev->open = vhci_open_dev;
130 hdev->close = vhci_close_dev;
131 hdev->flush = vhci_flush;
132 hdev->send = vhci_send_frame;
134 /* bit 6 is for external configuration */
136 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
138 /* bit 7 is for raw device */
140 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
142 if (hci_register_dev(hdev) < 0) {
143 BT_ERR("Can't register HCI device");
150 hci_skb_pkt_type(skb) = HCI_VENDOR_PKT;
152 skb_put_u8(skb, 0xff);
153 skb_put_u8(skb, opcode);
154 put_unaligned_le16(hdev->id, skb_put(skb, 2));
155 skb_queue_tail(&data->readq, skb);
157 wake_up_interruptible(&data->read_wait);
161 static int vhci_create_device(struct vhci_data *data, __u8 opcode)
165 mutex_lock(&data->open_mutex);
166 err = __vhci_create_device(data, opcode);
167 mutex_unlock(&data->open_mutex);
172 static inline ssize_t vhci_get_user(struct vhci_data *data,
173 struct iov_iter *from)
175 size_t len = iov_iter_count(from);
177 __u8 pkt_type, opcode;
180 if (len < 2 || len > HCI_MAX_FRAME_SIZE)
183 skb = bt_skb_alloc(len, GFP_KERNEL);
187 if (!copy_from_iter_full(skb_put(skb, len), len, from)) {
192 pkt_type = *((__u8 *) skb->data);
197 case HCI_ACLDATA_PKT:
198 case HCI_SCODATA_PKT:
204 hci_skb_pkt_type(skb) = pkt_type;
206 ret = hci_recv_frame(data->hdev, skb);
210 cancel_delayed_work_sync(&data->open_timeout);
212 opcode = *((__u8 *) skb->data);
222 ret = vhci_create_device(data, opcode);
230 return (ret < 0) ? ret : len;
233 static inline ssize_t vhci_put_user(struct vhci_data *data,
235 char __user *buf, int count)
237 char __user *ptr = buf;
240 len = min_t(unsigned int, skb->len, count);
242 if (copy_to_user(ptr, skb->data, len))
248 data->hdev->stat.byte_tx += len;
250 switch (hci_skb_pkt_type(skb)) {
251 case HCI_COMMAND_PKT:
252 data->hdev->stat.cmd_tx++;
254 case HCI_ACLDATA_PKT:
255 data->hdev->stat.acl_tx++;
257 case HCI_SCODATA_PKT:
258 data->hdev->stat.sco_tx++;
265 static ssize_t vhci_read(struct file *file,
266 char __user *buf, size_t count, loff_t *pos)
268 struct vhci_data *data = file->private_data;
273 skb = skb_dequeue(&data->readq);
275 ret = vhci_put_user(data, skb, buf, count);
277 skb_queue_head(&data->readq, skb);
283 if (file->f_flags & O_NONBLOCK) {
288 ret = wait_event_interruptible(data->read_wait,
289 !skb_queue_empty(&data->readq));
297 static ssize_t vhci_write(struct kiocb *iocb, struct iov_iter *from)
299 struct file *file = iocb->ki_filp;
300 struct vhci_data *data = file->private_data;
302 return vhci_get_user(data, from);
305 static unsigned int vhci_poll(struct file *file, poll_table *wait)
307 struct vhci_data *data = file->private_data;
309 poll_wait(file, &data->read_wait, wait);
311 if (!skb_queue_empty(&data->readq))
312 return POLLIN | POLLRDNORM;
314 return POLLOUT | POLLWRNORM;
317 static void vhci_open_timeout(struct work_struct *work)
319 struct vhci_data *data = container_of(work, struct vhci_data,
322 vhci_create_device(data, amp ? HCI_AMP : HCI_PRIMARY);
325 static int vhci_open(struct inode *inode, struct file *file)
327 struct vhci_data *data;
329 data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
333 skb_queue_head_init(&data->readq);
334 init_waitqueue_head(&data->read_wait);
336 mutex_init(&data->open_mutex);
337 INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout);
339 file->private_data = data;
340 nonseekable_open(inode, file);
342 schedule_delayed_work(&data->open_timeout, msecs_to_jiffies(1000));
347 static int vhci_release(struct inode *inode, struct file *file)
349 struct vhci_data *data = file->private_data;
350 struct hci_dev *hdev;
352 cancel_delayed_work_sync(&data->open_timeout);
357 hci_unregister_dev(hdev);
361 skb_queue_purge(&data->readq);
362 file->private_data = NULL;
368 static const struct file_operations vhci_fops = {
369 .owner = THIS_MODULE,
371 .write_iter = vhci_write,
374 .release = vhci_release,
378 static struct miscdevice vhci_miscdev = {
383 module_misc_device(vhci_miscdev);
385 module_param(amp, bool, 0644);
386 MODULE_PARM_DESC(amp, "Create AMP controller device");
388 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
389 MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
390 MODULE_VERSION(VERSION);
391 MODULE_LICENSE("GPL");
392 MODULE_ALIAS("devname:vhci");
393 MODULE_ALIAS_MISCDEV(VHCI_MINOR);