blob: 158bfe507da7fb19f4149ce63806bd9e8c510409 [file] [log] [blame]
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
Andrei Emeltchenko36acbb12011-11-14 12:42:48 +020044static bool amp;
45
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070046struct 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{
David Herrmann155961e2012-02-09 21:58:32 +010064 struct vhci_data *data = hci_get_drvdata(hdev);
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{
David Herrmann155961e2012-02-09 21:58:32 +010076 struct vhci_data *data = hci_get_drvdata(hdev);
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
David Herrmann155961e2012-02-09 21:58:32 +010096 data = hci_get_drvdata(hdev);
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 Holtmann9c724352006-07-06 15:45:23 +0200106static inline ssize_t vhci_get_user(struct vhci_data *data,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700107 const char __user *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108{
109 struct sk_buff *skb;
110
111 if (count > HCI_MAX_FRAME_SIZE)
112 return -EINVAL;
113
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700114 skb = bt_skb_alloc(count, GFP_KERNEL);
115 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 return -ENOMEM;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700117
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 if (copy_from_user(skb_put(skb, count), buf, count)) {
119 kfree_skb(skb);
120 return -EFAULT;
121 }
122
Marcel Holtmann9c724352006-07-06 15:45:23 +0200123 skb->dev = (void *) data->hdev;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700124 bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 skb_pull(skb, 1);
126
127 hci_recv_frame(skb);
128
129 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130}
131
Marcel Holtmann9c724352006-07-06 15:45:23 +0200132static inline ssize_t vhci_put_user(struct vhci_data *data,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700133 struct sk_buff *skb, char __user *buf, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 char __user *ptr = buf;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700136 int len, total = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700138 len = min_t(unsigned int, skb->len, count);
139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 if (copy_to_user(ptr, skb->data, len))
141 return -EFAULT;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 total += len;
144
Marcel Holtmann9c724352006-07-06 15:45:23 +0200145 data->hdev->stat.byte_tx += len;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700146
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700147 switch (bt_cb(skb)->pkt_type) {
148 case HCI_COMMAND_PKT:
Marcel Holtmann9c724352006-07-06 15:45:23 +0200149 data->hdev->stat.cmd_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700150 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700152 case HCI_ACLDATA_PKT:
Marcel Holtmann9c724352006-07-06 15:45:23 +0200153 data->hdev->stat.acl_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700154 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700156 case HCI_SCODATA_PKT:
Gustavo F. Padovan4f7ac182010-05-01 16:15:34 -0300157 data->hdev->stat.sco_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700158 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 };
160
161 return total;
162}
163
Marcel Holtmann9c724352006-07-06 15:45:23 +0200164static ssize_t vhci_read(struct file *file,
165 char __user *buf, size_t count, loff_t *pos)
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700166{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200167 struct vhci_data *data = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 struct sk_buff *skb;
169 ssize_t ret = 0;
170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 while (count) {
Marcel Holtmann9c724352006-07-06 15:45:23 +0200172 skb = skb_dequeue(&data->readq);
Marcel Holtmann4db75892009-06-08 14:13:57 +0200173 if (skb) {
174 ret = vhci_put_user(data, skb, buf, count);
175 if (ret < 0)
176 skb_queue_head(&data->readq, skb);
177 else
178 kfree_skb(skb);
179 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 }
181
Marcel Holtmann4db75892009-06-08 14:13:57 +0200182 if (file->f_flags & O_NONBLOCK) {
183 ret = -EAGAIN;
184 break;
185 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Marcel Holtmann4db75892009-06-08 14:13:57 +0200187 ret = wait_event_interruptible(data->read_wait,
188 !skb_queue_empty(&data->readq));
189 if (ret < 0)
190 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
193 return ret;
194}
195
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700196static ssize_t vhci_write(struct file *file,
197 const char __user *buf, size_t count, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200199 struct vhci_data *data = file->private_data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700200
Marcel Holtmann9c724352006-07-06 15:45:23 +0200201 return vhci_get_user(data, buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202}
203
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700204static unsigned int vhci_poll(struct file *file, poll_table *wait)
205{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200206 struct vhci_data *data = file->private_data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700207
Marcel Holtmann9c724352006-07-06 15:45:23 +0200208 poll_wait(file, &data->read_wait, wait);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700209
Marcel Holtmann9c724352006-07-06 15:45:23 +0200210 if (!skb_queue_empty(&data->readq))
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700211 return POLLIN | POLLRDNORM;
212
213 return POLLOUT | POLLWRNORM;
214}
215
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700216static int vhci_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200218 struct vhci_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 struct hci_dev *hdev;
220
Marcel Holtmann9c724352006-07-06 15:45:23 +0200221 data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
222 if (!data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 return -ENOMEM;
224
Marcel Holtmann9c724352006-07-06 15:45:23 +0200225 skb_queue_head_init(&data->readq);
226 init_waitqueue_head(&data->read_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 hdev = hci_alloc_dev();
229 if (!hdev) {
Marcel Holtmann9c724352006-07-06 15:45:23 +0200230 kfree(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 return -ENOMEM;
232 }
233
Marcel Holtmann9c724352006-07-06 15:45:23 +0200234 data->hdev = hdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Marcel Holtmannc13854c2010-02-08 15:27:07 +0100236 hdev->bus = HCI_VIRTUAL;
David Herrmann155961e2012-02-09 21:58:32 +0100237 hci_set_drvdata(hdev, data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
Andrei Emeltchenko36acbb12011-11-14 12:42:48 +0200239 if (amp)
240 hdev->dev_type = HCI_AMP;
241
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 if (hci_register_dev(hdev) < 0) {
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700248 BT_ERR("Can't register HCI device");
Marcel Holtmann9c724352006-07-06 15:45:23 +0200249 kfree(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 hci_free_dev(hdev);
251 return -EBUSY;
252 }
253
Marcel Holtmann9c724352006-07-06 15:45:23 +0200254 file->private_data = data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700255
256 return nonseekable_open(inode, file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257}
258
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700259static int vhci_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200261 struct vhci_data *data = file->private_data;
262 struct hci_dev *hdev = data->hdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
David Herrmann13ea4012011-10-26 10:43:18 +0200264 hci_unregister_dev(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 hci_free_dev(hdev);
266
267 file->private_data = NULL;
David Herrmannbf18c712012-01-07 15:47:14 +0100268 kfree(data);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 return 0;
271}
272
Arjan van de Ven2b8693c2007-02-12 00:55:32 -0800273static const struct file_operations vhci_fops = {
Marcel Holtmannfed4c252009-12-03 18:07:28 +0100274 .owner = THIS_MODULE,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700275 .read = vhci_read,
276 .write = vhci_write,
277 .poll = vhci_poll,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700278 .open = vhci_open,
279 .release = vhci_release,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200280 .llseek = no_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281};
282
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700283static struct miscdevice vhci_miscdev= {
Marcel Holtmannac284942009-06-07 18:09:57 +0200284 .name = "vhci",
285 .fops = &vhci_fops,
286 .minor = MISC_DYNAMIC_MINOR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287};
288
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700289static int __init vhci_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290{
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700291 BT_INFO("Virtual HCI driver ver %s", VERSION);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Marcel Holtmann329ab1b2009-12-03 18:05:16 +0100293 return misc_register(&vhci_miscdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294}
295
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700296static void __exit vhci_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297{
Marcel Holtmann329ab1b2009-12-03 18:05:16 +0100298 misc_deregister(&vhci_miscdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299}
300
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700301module_init(vhci_init);
302module_exit(vhci_exit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
Andrei Emeltchenko36acbb12011-11-14 12:42:48 +0200304module_param(amp, bool, 0644);
305MODULE_PARM_DESC(amp, "Create AMP controller device");
306
Marcel Holtmann63fbd242008-08-18 13:23:53 +0200307MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700308MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
309MODULE_VERSION(VERSION);
310MODULE_LICENSE("GPL");