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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
44static int minor = MISC_DYNAMIC_MINOR;
45
46struct vhci_data {
47 struct hci_dev *hdev;
48
49 unsigned long flags;
50
51 wait_queue_head_t read_wait;
52 struct sk_buff_head readq;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070053};
54
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070055static int vhci_open_dev(struct hci_dev *hdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
57 set_bit(HCI_RUNNING, &hdev->flags);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070058
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 return 0;
60}
61
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070062static int vhci_close_dev(struct hci_dev *hdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
Marcel Holtmann9c724352006-07-06 15:45:23 +020064 struct vhci_data *data = hdev->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
67 return 0;
68
Marcel Holtmann9c724352006-07-06 15:45:23 +020069 skb_queue_purge(&data->readq);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070070
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 return 0;
72}
73
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070074static int vhci_flush(struct hci_dev *hdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
Marcel Holtmann9c724352006-07-06 15:45:23 +020076 struct vhci_data *data = hdev->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Marcel Holtmann9c724352006-07-06 15:45:23 +020078 skb_queue_purge(&data->readq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070080 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081}
82
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070083static int vhci_send_frame(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084{
85 struct hci_dev* hdev = (struct hci_dev *) skb->dev;
Marcel Holtmann9c724352006-07-06 15:45:23 +020086 struct vhci_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 if (!hdev) {
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070089 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 return -ENODEV;
91 }
92
93 if (!test_bit(HCI_RUNNING, &hdev->flags))
94 return -EBUSY;
95
Marcel Holtmann9c724352006-07-06 15:45:23 +020096 data = hdev->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Marcel Holtmann0d48d932005-08-09 20:30:28 -070098 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
Marcel Holtmann9c724352006-07-06 15:45:23 +020099 skb_queue_tail(&data->readq, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Marcel Holtmann9c724352006-07-06 15:45:23 +0200101 wake_up_interruptible(&data->read_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103 return 0;
104}
105
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700106static void vhci_destruct(struct hci_dev *hdev)
107{
108 kfree(hdev->driver_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109}
110
Marcel Holtmann9c724352006-07-06 15:45:23 +0200111static inline ssize_t vhci_get_user(struct vhci_data *data,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700112 const char __user *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113{
114 struct sk_buff *skb;
115
116 if (count > HCI_MAX_FRAME_SIZE)
117 return -EINVAL;
118
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700119 skb = bt_skb_alloc(count, GFP_KERNEL);
120 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 return -ENOMEM;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 if (copy_from_user(skb_put(skb, count), buf, count)) {
124 kfree_skb(skb);
125 return -EFAULT;
126 }
127
Marcel Holtmann9c724352006-07-06 15:45:23 +0200128 skb->dev = (void *) data->hdev;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700129 bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 skb_pull(skb, 1);
131
132 hci_recv_frame(skb);
133
134 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135}
136
Marcel Holtmann9c724352006-07-06 15:45:23 +0200137static inline ssize_t vhci_put_user(struct vhci_data *data,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700138 struct sk_buff *skb, char __user *buf, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 char __user *ptr = buf;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700141 int len, total = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700143 len = min_t(unsigned int, skb->len, count);
144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 if (copy_to_user(ptr, skb->data, len))
146 return -EFAULT;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 total += len;
149
Marcel Holtmann9c724352006-07-06 15:45:23 +0200150 data->hdev->stat.byte_tx += len;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700151
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700152 switch (bt_cb(skb)->pkt_type) {
153 case HCI_COMMAND_PKT:
Marcel Holtmann9c724352006-07-06 15:45:23 +0200154 data->hdev->stat.cmd_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700155 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700157 case HCI_ACLDATA_PKT:
Marcel Holtmann9c724352006-07-06 15:45:23 +0200158 data->hdev->stat.acl_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700159 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700161 case HCI_SCODATA_PKT:
Marcel Holtmann9c724352006-07-06 15:45:23 +0200162 data->hdev->stat.cmd_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700163 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 };
165
166 return total;
167}
168
Marcel Holtmann9c724352006-07-06 15:45:23 +0200169static ssize_t vhci_read(struct file *file,
170 char __user *buf, size_t count, loff_t *pos)
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700171{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200172 struct vhci_data *data = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 struct sk_buff *skb;
174 ssize_t ret = 0;
175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 while (count) {
Marcel Holtmann9c724352006-07-06 15:45:23 +0200177 skb = skb_dequeue(&data->readq);
Marcel Holtmann4db75892009-06-08 14:13:57 +0200178 if (skb) {
179 ret = vhci_put_user(data, skb, buf, count);
180 if (ret < 0)
181 skb_queue_head(&data->readq, skb);
182 else
183 kfree_skb(skb);
184 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
186
Marcel Holtmann4db75892009-06-08 14:13:57 +0200187 if (file->f_flags & O_NONBLOCK) {
188 ret = -EAGAIN;
189 break;
190 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Marcel Holtmann4db75892009-06-08 14:13:57 +0200192 ret = wait_event_interruptible(data->read_wait,
193 !skb_queue_empty(&data->readq));
194 if (ret < 0)
195 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198 return ret;
199}
200
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700201static ssize_t vhci_write(struct file *file,
202 const char __user *buf, size_t count, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200204 struct vhci_data *data = file->private_data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700205
Marcel Holtmann9c724352006-07-06 15:45:23 +0200206 return vhci_get_user(data, buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207}
208
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700209static unsigned int vhci_poll(struct file *file, poll_table *wait)
210{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200211 struct vhci_data *data = file->private_data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700212
Marcel Holtmann9c724352006-07-06 15:45:23 +0200213 poll_wait(file, &data->read_wait, wait);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700214
Marcel Holtmann9c724352006-07-06 15:45:23 +0200215 if (!skb_queue_empty(&data->readq))
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700216 return POLLIN | POLLRDNORM;
217
218 return POLLOUT | POLLWRNORM;
219}
220
221static int vhci_ioctl(struct inode *inode, struct file *file,
222 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
224 return -EINVAL;
225}
226
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700227static int vhci_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200229 struct vhci_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 struct hci_dev *hdev;
231
Marcel Holtmann9c724352006-07-06 15:45:23 +0200232 data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
233 if (!data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 return -ENOMEM;
235
Marcel Holtmann9c724352006-07-06 15:45:23 +0200236 skb_queue_head_init(&data->readq);
237 init_waitqueue_head(&data->read_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 hdev = hci_alloc_dev();
240 if (!hdev) {
Marcel Holtmann9c724352006-07-06 15:45:23 +0200241 kfree(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 return -ENOMEM;
243 }
244
Marcel Holtmann9c724352006-07-06 15:45:23 +0200245 data->hdev = hdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
Marcel Holtmann0ac53932006-07-08 13:57:15 +0200247 hdev->type = HCI_VIRTUAL;
Marcel Holtmann9c724352006-07-06 15:45:23 +0200248 hdev->driver_data = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700250 hdev->open = vhci_open_dev;
251 hdev->close = vhci_close_dev;
252 hdev->flush = vhci_flush;
253 hdev->send = vhci_send_frame;
254 hdev->destruct = vhci_destruct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
256 hdev->owner = THIS_MODULE;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 if (hci_register_dev(hdev) < 0) {
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700259 BT_ERR("Can't register HCI device");
Marcel Holtmann9c724352006-07-06 15:45:23 +0200260 kfree(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 hci_free_dev(hdev);
262 return -EBUSY;
263 }
264
Marcel Holtmann9c724352006-07-06 15:45:23 +0200265 file->private_data = data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700266
267 return nonseekable_open(inode, file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268}
269
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700270static int vhci_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200272 struct vhci_data *data = file->private_data;
273 struct hci_dev *hdev = data->hdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
275 if (hci_unregister_dev(hdev) < 0) {
276 BT_ERR("Can't unregister HCI device %s", hdev->name);
277 }
278
279 hci_free_dev(hdev);
280
281 file->private_data = NULL;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700282
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 return 0;
284}
285
Arjan van de Ven2b8693c2007-02-12 00:55:32 -0800286static const struct file_operations vhci_fops = {
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700287 .read = vhci_read,
288 .write = vhci_write,
289 .poll = vhci_poll,
290 .ioctl = vhci_ioctl,
291 .open = vhci_open,
292 .release = vhci_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293};
294
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700295static struct miscdevice vhci_miscdev= {
Marcel Holtmannac284942009-06-07 18:09:57 +0200296 .name = "vhci",
297 .fops = &vhci_fops,
298 .minor = MISC_DYNAMIC_MINOR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299};
300
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700301static int __init vhci_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302{
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700303 BT_INFO("Virtual HCI driver ver %s", VERSION);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700305 if (misc_register(&vhci_miscdev) < 0) {
306 BT_ERR("Can't register misc device with minor %d", minor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 return -EIO;
308 }
309
310 return 0;
311}
312
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700313static void __exit vhci_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314{
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700315 if (misc_deregister(&vhci_miscdev) < 0)
316 BT_ERR("Can't unregister misc device with minor %d", minor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317}
318
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700319module_init(vhci_init);
320module_exit(vhci_exit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
Marcel Holtmann63fbd242008-08-18 13:23:53 +0200322MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700323MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
324MODULE_VERSION(VERSION);
325MODULE_LICENSE("GPL");