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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
Marcel Holtmann4aa769b2005-08-09 20:27:37 -07003 * Bluetooth virtual HCI driver
4 *
Marcel Holtmann9c724352006-07-06 15:45:23 +02005 * 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>
Marcel Holtmann4aa769b2005-08-09 20:27:37 -07008 *
9 *
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.
14 *
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.
19 *
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
23 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/module.h>
27
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/init.h>
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070030#include <linux/slab.h>
31#include <linux/types.h>
32#include <linux/errno.h>
33#include <linux/sched.h>
34#include <linux/poll.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#include <linux/skbuff.h>
37#include <linux/miscdevice.h>
38
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <net/bluetooth/bluetooth.h>
40#include <net/bluetooth/hci_core.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Marcel Holtmannac284942009-06-07 18:09:57 +020042#define VERSION "1.3"
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070043
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070044struct vhci_data {
45 struct hci_dev *hdev;
46
47 unsigned long flags;
48
49 wait_queue_head_t read_wait;
50 struct sk_buff_head readq;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070051};
52
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070053static int vhci_open_dev(struct hci_dev *hdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
55 set_bit(HCI_RUNNING, &hdev->flags);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070056
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 return 0;
58}
59
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070060static int vhci_close_dev(struct hci_dev *hdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061{
Marcel Holtmann9c724352006-07-06 15:45:23 +020062 struct vhci_data *data = hdev->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
65 return 0;
66
Marcel Holtmann9c724352006-07-06 15:45:23 +020067 skb_queue_purge(&data->readq);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070068
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 return 0;
70}
71
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070072static int vhci_flush(struct hci_dev *hdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073{
Marcel Holtmann9c724352006-07-06 15:45:23 +020074 struct vhci_data *data = hdev->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Marcel Holtmann9c724352006-07-06 15:45:23 +020076 skb_queue_purge(&data->readq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070078 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079}
80
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070081static int vhci_send_frame(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
83 struct hci_dev* hdev = (struct hci_dev *) skb->dev;
Marcel Holtmann9c724352006-07-06 15:45:23 +020084 struct vhci_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
86 if (!hdev) {
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070087 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 return -ENODEV;
89 }
90
91 if (!test_bit(HCI_RUNNING, &hdev->flags))
92 return -EBUSY;
93
Marcel Holtmann9c724352006-07-06 15:45:23 +020094 data = hdev->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Marcel Holtmann0d48d932005-08-09 20:30:28 -070096 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
Marcel Holtmann9c724352006-07-06 15:45:23 +020097 skb_queue_tail(&data->readq, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
Marcel Holtmann9c724352006-07-06 15:45:23 +020099 wake_up_interruptible(&data->read_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101 return 0;
102}
103
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700104static void vhci_destruct(struct hci_dev *hdev)
105{
106 kfree(hdev->driver_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107}
108
Marcel Holtmann9c724352006-07-06 15:45:23 +0200109static inline ssize_t vhci_get_user(struct vhci_data *data,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700110 const char __user *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
112 struct sk_buff *skb;
113
114 if (count > HCI_MAX_FRAME_SIZE)
115 return -EINVAL;
116
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700117 skb = bt_skb_alloc(count, GFP_KERNEL);
118 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 return -ENOMEM;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 if (copy_from_user(skb_put(skb, count), buf, count)) {
122 kfree_skb(skb);
123 return -EFAULT;
124 }
125
Marcel Holtmann9c724352006-07-06 15:45:23 +0200126 skb->dev = (void *) data->hdev;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700127 bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 skb_pull(skb, 1);
129
130 hci_recv_frame(skb);
131
132 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133}
134
Marcel Holtmann9c724352006-07-06 15:45:23 +0200135static inline ssize_t vhci_put_user(struct vhci_data *data,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700136 struct sk_buff *skb, char __user *buf, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 char __user *ptr = buf;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700139 int len, total = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700141 len = min_t(unsigned int, skb->len, count);
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 if (copy_to_user(ptr, skb->data, len))
144 return -EFAULT;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700145
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 total += len;
147
Marcel Holtmann9c724352006-07-06 15:45:23 +0200148 data->hdev->stat.byte_tx += len;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700149
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700150 switch (bt_cb(skb)->pkt_type) {
151 case HCI_COMMAND_PKT:
Marcel Holtmann9c724352006-07-06 15:45:23 +0200152 data->hdev->stat.cmd_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700153 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700155 case HCI_ACLDATA_PKT:
Marcel Holtmann9c724352006-07-06 15:45:23 +0200156 data->hdev->stat.acl_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700157 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700159 case HCI_SCODATA_PKT:
Marcel Holtmann9c724352006-07-06 15:45:23 +0200160 data->hdev->stat.cmd_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700161 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 };
163
164 return total;
165}
166
Marcel Holtmann9c724352006-07-06 15:45:23 +0200167static ssize_t vhci_read(struct file *file,
168 char __user *buf, size_t count, loff_t *pos)
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700169{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200170 struct vhci_data *data = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 struct sk_buff *skb;
172 ssize_t ret = 0;
173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 while (count) {
Marcel Holtmann9c724352006-07-06 15:45:23 +0200175 skb = skb_dequeue(&data->readq);
Marcel Holtmann4db75892009-06-08 14:13:57 +0200176 if (skb) {
177 ret = vhci_put_user(data, skb, buf, count);
178 if (ret < 0)
179 skb_queue_head(&data->readq, skb);
180 else
181 kfree_skb(skb);
182 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 }
184
Marcel Holtmann4db75892009-06-08 14:13:57 +0200185 if (file->f_flags & O_NONBLOCK) {
186 ret = -EAGAIN;
187 break;
188 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Marcel Holtmann4db75892009-06-08 14:13:57 +0200190 ret = wait_event_interruptible(data->read_wait,
191 !skb_queue_empty(&data->readq));
192 if (ret < 0)
193 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
196 return ret;
197}
198
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700199static ssize_t vhci_write(struct file *file,
200 const char __user *buf, size_t count, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200202 struct vhci_data *data = file->private_data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700203
Marcel Holtmann9c724352006-07-06 15:45:23 +0200204 return vhci_get_user(data, buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205}
206
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700207static unsigned int vhci_poll(struct file *file, poll_table *wait)
208{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200209 struct vhci_data *data = file->private_data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700210
Marcel Holtmann9c724352006-07-06 15:45:23 +0200211 poll_wait(file, &data->read_wait, wait);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700212
Marcel Holtmann9c724352006-07-06 15:45:23 +0200213 if (!skb_queue_empty(&data->readq))
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700214 return POLLIN | POLLRDNORM;
215
216 return POLLOUT | POLLWRNORM;
217}
218
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700219static int vhci_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200221 struct vhci_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 struct hci_dev *hdev;
223
Marcel Holtmann9c724352006-07-06 15:45:23 +0200224 data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
225 if (!data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 return -ENOMEM;
227
Marcel Holtmann9c724352006-07-06 15:45:23 +0200228 skb_queue_head_init(&data->readq);
229 init_waitqueue_head(&data->read_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 hdev = hci_alloc_dev();
232 if (!hdev) {
Marcel Holtmann9c724352006-07-06 15:45:23 +0200233 kfree(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 return -ENOMEM;
235 }
236
Marcel Holtmann9c724352006-07-06 15:45:23 +0200237 data->hdev = hdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
Marcel Holtmannc13854c2010-02-08 15:27:07 +0100239 hdev->bus = HCI_VIRTUAL;
Marcel Holtmann9c724352006-07-06 15:45:23 +0200240 hdev->driver_data = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700242 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
248 hdev->owner = THIS_MODULE;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 if (hci_register_dev(hdev) < 0) {
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700251 BT_ERR("Can't register HCI device");
Marcel Holtmann9c724352006-07-06 15:45:23 +0200252 kfree(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 hci_free_dev(hdev);
254 return -EBUSY;
255 }
256
Marcel Holtmann9c724352006-07-06 15:45:23 +0200257 file->private_data = data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700258
259 return nonseekable_open(inode, file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260}
261
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700262static int vhci_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200264 struct vhci_data *data = file->private_data;
265 struct hci_dev *hdev = data->hdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
267 if (hci_unregister_dev(hdev) < 0) {
268 BT_ERR("Can't unregister HCI device %s", hdev->name);
269 }
270
271 hci_free_dev(hdev);
272
273 file->private_data = NULL;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 return 0;
276}
277
Arjan van de Ven2b8693c2007-02-12 00:55:32 -0800278static const struct file_operations vhci_fops = {
Marcel Holtmannfed4c252009-12-03 18:07:28 +0100279 .owner = THIS_MODULE,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700280 .read = vhci_read,
281 .write = vhci_write,
282 .poll = vhci_poll,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700283 .open = vhci_open,
284 .release = vhci_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285};
286
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700287static struct miscdevice vhci_miscdev= {
Marcel Holtmannac284942009-06-07 18:09:57 +0200288 .name = "vhci",
289 .fops = &vhci_fops,
290 .minor = MISC_DYNAMIC_MINOR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291};
292
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700293static int __init vhci_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700295 BT_INFO("Virtual HCI driver ver %s", VERSION);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
Marcel Holtmann329ab1b2009-12-03 18:05:16 +0100297 return misc_register(&vhci_miscdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298}
299
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700300static void __exit vhci_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
Marcel Holtmann329ab1b2009-12-03 18:05:16 +0100302 misc_deregister(&vhci_miscdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303}
304
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700305module_init(vhci_init);
306module_exit(vhci_exit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
Marcel Holtmann63fbd242008-08-18 13:23:53 +0200308MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700309MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
310MODULE_VERSION(VERSION);
311MODULE_LICENSE("GPL");