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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>
Marcel Holtmann23424c02013-09-02 10:41:39 -070027#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/init.h>
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070031#include <linux/slab.h>
32#include <linux/types.h>
33#include <linux/errno.h>
34#include <linux/sched.h>
35#include <linux/poll.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37#include <linux/skbuff.h>
38#include <linux/miscdevice.h>
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <net/bluetooth/bluetooth.h>
41#include <net/bluetooth/hci_core.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Marcel Holtmann23424c02013-09-02 10:41:39 -070043#define VERSION "1.4"
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070044
Andrei Emeltchenko36acbb12011-11-14 12:42:48 +020045static bool amp;
46
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070047struct vhci_data {
48 struct hci_dev *hdev;
49
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070050 wait_queue_head_t read_wait;
51 struct sk_buff_head readq;
Marcel Holtmann23424c02013-09-02 10:41:39 -070052
53 struct delayed_work open_timeout;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070054};
55
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070056static int vhci_open_dev(struct hci_dev *hdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057{
58 set_bit(HCI_RUNNING, &hdev->flags);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070059
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 return 0;
61}
62
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070063static int vhci_close_dev(struct hci_dev *hdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
David Herrmann155961e2012-02-09 21:58:32 +010065 struct vhci_data *data = hci_get_drvdata(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
68 return 0;
69
Marcel Holtmann9c724352006-07-06 15:45:23 +020070 skb_queue_purge(&data->readq);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070071
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 return 0;
73}
74
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070075static int vhci_flush(struct hci_dev *hdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070076{
David Herrmann155961e2012-02-09 21:58:32 +010077 struct vhci_data *data = hci_get_drvdata(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Marcel Holtmann9c724352006-07-06 15:45:23 +020079 skb_queue_purge(&data->readq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070081 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082}
83
Marcel Holtmann7bd8f092013-10-11 06:19:18 -070084static int vhci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
Marcel Holtmann60298772013-10-11 07:01:04 -070086 struct vhci_data *data = hci_get_drvdata(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 if (!test_bit(HCI_RUNNING, &hdev->flags))
89 return -EBUSY;
90
Marcel Holtmann0d48d932005-08-09 20:30:28 -070091 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
Marcel Holtmann9c724352006-07-06 15:45:23 +020092 skb_queue_tail(&data->readq, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Marcel Holtmann9c724352006-07-06 15:45:23 +020094 wake_up_interruptible(&data->read_wait);
Marcel Holtmann23424c02013-09-02 10:41:39 -070095 return 0;
96}
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Marcel Holtmann23424c02013-09-02 10:41:39 -070098static int vhci_create_device(struct vhci_data *data, __u8 dev_type)
99{
100 struct hci_dev *hdev;
101 struct sk_buff *skb;
102
103 skb = bt_skb_alloc(4, GFP_KERNEL);
104 if (!skb)
105 return -ENOMEM;
106
107 hdev = hci_alloc_dev();
108 if (!hdev) {
109 kfree_skb(skb);
110 return -ENOMEM;
111 }
112
113 data->hdev = hdev;
114
115 hdev->bus = HCI_VIRTUAL;
116 hdev->dev_type = dev_type;
117 hci_set_drvdata(hdev, data);
118
119 hdev->open = vhci_open_dev;
120 hdev->close = vhci_close_dev;
121 hdev->flush = vhci_flush;
122 hdev->send = vhci_send_frame;
123
124 if (hci_register_dev(hdev) < 0) {
125 BT_ERR("Can't register HCI device");
126 hci_free_dev(hdev);
127 data->hdev = NULL;
128 kfree_skb(skb);
129 return -EBUSY;
130 }
131
132 bt_cb(skb)->pkt_type = HCI_VENDOR_PKT;
133
134 *skb_put(skb, 1) = 0xff;
135 *skb_put(skb, 1) = dev_type;
136 put_unaligned_le16(hdev->id, skb_put(skb, 2));
137 skb_queue_tail(&data->readq, skb);
138
139 wake_up_interruptible(&data->read_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 return 0;
141}
142
Marcel Holtmann9c724352006-07-06 15:45:23 +0200143static inline ssize_t vhci_get_user(struct vhci_data *data,
Marcel Holtmann5bc00b52013-12-28 21:57:14 -0800144 const struct iovec *iov,
145 unsigned long count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146{
Marcel Holtmann5bc00b52013-12-28 21:57:14 -0800147 size_t len = iov_length(iov, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 struct sk_buff *skb;
Marcel Holtmann23424c02013-09-02 10:41:39 -0700149 __u8 pkt_type, dev_type;
Marcel Holtmann5bc00b52013-12-28 21:57:14 -0800150 unsigned long i;
Marcel Holtmann23424c02013-09-02 10:41:39 -0700151 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Marcel Holtmann5bc00b52013-12-28 21:57:14 -0800153 if (len < 2 || len > HCI_MAX_FRAME_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 return -EINVAL;
155
Marcel Holtmann5bc00b52013-12-28 21:57:14 -0800156 skb = bt_skb_alloc(len, GFP_KERNEL);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700157 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 return -ENOMEM;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700159
Marcel Holtmann5bc00b52013-12-28 21:57:14 -0800160 for (i = 0; i < count; i++) {
161 if (copy_from_user(skb_put(skb, iov[i].iov_len),
162 iov[i].iov_base, iov[i].iov_len)) {
163 kfree_skb(skb);
164 return -EFAULT;
165 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 }
167
Marcel Holtmann23424c02013-09-02 10:41:39 -0700168 pkt_type = *((__u8 *) skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 skb_pull(skb, 1);
170
Marcel Holtmann23424c02013-09-02 10:41:39 -0700171 switch (pkt_type) {
172 case HCI_EVENT_PKT:
173 case HCI_ACLDATA_PKT:
174 case HCI_SCODATA_PKT:
175 if (!data->hdev) {
176 kfree_skb(skb);
177 return -ENODEV;
178 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Marcel Holtmann23424c02013-09-02 10:41:39 -0700180 bt_cb(skb)->pkt_type = pkt_type;
181
Marcel Holtmanne1a26172013-10-10 16:52:43 -0700182 ret = hci_recv_frame(data->hdev, skb);
Marcel Holtmann23424c02013-09-02 10:41:39 -0700183 break;
184
185 case HCI_VENDOR_PKT:
186 if (data->hdev) {
187 kfree_skb(skb);
188 return -EBADFD;
189 }
190
191 cancel_delayed_work_sync(&data->open_timeout);
192
193 dev_type = *((__u8 *) skb->data);
194 skb_pull(skb, 1);
195
196 if (skb->len > 0) {
197 kfree_skb(skb);
198 return -EINVAL;
199 }
200
201 kfree_skb(skb);
202
203 if (dev_type != HCI_BREDR && dev_type != HCI_AMP)
204 return -EINVAL;
205
206 ret = vhci_create_device(data, dev_type);
207 break;
208
209 default:
210 kfree_skb(skb);
211 return -EINVAL;
212 }
213
Marcel Holtmann5bc00b52013-12-28 21:57:14 -0800214 return (ret < 0) ? ret : len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215}
216
Marcel Holtmann9c724352006-07-06 15:45:23 +0200217static inline ssize_t vhci_put_user(struct vhci_data *data,
Marcel Holtmann23424c02013-09-02 10:41:39 -0700218 struct sk_buff *skb,
219 char __user *buf, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 char __user *ptr = buf;
Marcel Holtmann23424c02013-09-02 10:41:39 -0700222 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700224 len = min_t(unsigned int, skb->len, count);
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 if (copy_to_user(ptr, skb->data, len))
227 return -EFAULT;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700228
Marcel Holtmann23424c02013-09-02 10:41:39 -0700229 if (!data->hdev)
230 return len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
Marcel Holtmann9c724352006-07-06 15:45:23 +0200232 data->hdev->stat.byte_tx += len;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700233
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700234 switch (bt_cb(skb)->pkt_type) {
235 case HCI_COMMAND_PKT:
Marcel Holtmann9c724352006-07-06 15:45:23 +0200236 data->hdev->stat.cmd_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700237 break;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700238 case HCI_ACLDATA_PKT:
Marcel Holtmann9c724352006-07-06 15:45:23 +0200239 data->hdev->stat.acl_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700240 break;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700241 case HCI_SCODATA_PKT:
Gustavo F. Padovan4f7ac182010-05-01 16:15:34 -0300242 data->hdev->stat.sco_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700243 break;
Peter Senna Tschudin2c24d452012-09-07 17:24:47 +0200244 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Marcel Holtmann23424c02013-09-02 10:41:39 -0700246 return len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247}
248
Marcel Holtmann9c724352006-07-06 15:45:23 +0200249static ssize_t vhci_read(struct file *file,
Marcel Holtmann23424c02013-09-02 10:41:39 -0700250 char __user *buf, size_t count, loff_t *pos)
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700251{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200252 struct vhci_data *data = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 struct sk_buff *skb;
254 ssize_t ret = 0;
255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 while (count) {
Marcel Holtmann9c724352006-07-06 15:45:23 +0200257 skb = skb_dequeue(&data->readq);
Marcel Holtmann4db75892009-06-08 14:13:57 +0200258 if (skb) {
259 ret = vhci_put_user(data, skb, buf, count);
260 if (ret < 0)
261 skb_queue_head(&data->readq, skb);
262 else
263 kfree_skb(skb);
264 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 }
266
Marcel Holtmann4db75892009-06-08 14:13:57 +0200267 if (file->f_flags & O_NONBLOCK) {
268 ret = -EAGAIN;
269 break;
270 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Marcel Holtmann4db75892009-06-08 14:13:57 +0200272 ret = wait_event_interruptible(data->read_wait,
Marcel Holtmann23424c02013-09-02 10:41:39 -0700273 !skb_queue_empty(&data->readq));
Marcel Holtmann4db75892009-06-08 14:13:57 +0200274 if (ret < 0)
275 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
278 return ret;
279}
280
Marcel Holtmann5bc00b52013-12-28 21:57:14 -0800281static ssize_t vhci_write(struct kiocb *iocb, const struct iovec *iov,
282 unsigned long count, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283{
Marcel Holtmann5bc00b52013-12-28 21:57:14 -0800284 struct file *file = iocb->ki_filp;
Marcel Holtmann9c724352006-07-06 15:45:23 +0200285 struct vhci_data *data = file->private_data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700286
Marcel Holtmann5bc00b52013-12-28 21:57:14 -0800287 return vhci_get_user(data, iov, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288}
289
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700290static unsigned int vhci_poll(struct file *file, poll_table *wait)
291{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200292 struct vhci_data *data = file->private_data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700293
Marcel Holtmann9c724352006-07-06 15:45:23 +0200294 poll_wait(file, &data->read_wait, wait);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700295
Marcel Holtmann9c724352006-07-06 15:45:23 +0200296 if (!skb_queue_empty(&data->readq))
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700297 return POLLIN | POLLRDNORM;
298
299 return POLLOUT | POLLWRNORM;
300}
301
Marcel Holtmann23424c02013-09-02 10:41:39 -0700302static void vhci_open_timeout(struct work_struct *work)
303{
304 struct vhci_data *data = container_of(work, struct vhci_data,
305 open_timeout.work);
306
307 vhci_create_device(data, amp ? HCI_AMP : HCI_BREDR);
308}
309
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700310static int vhci_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200312 struct vhci_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Marcel Holtmann9c724352006-07-06 15:45:23 +0200314 data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
315 if (!data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 return -ENOMEM;
317
Marcel Holtmann9c724352006-07-06 15:45:23 +0200318 skb_queue_head_init(&data->readq);
319 init_waitqueue_head(&data->read_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Marcel Holtmann23424c02013-09-02 10:41:39 -0700321 INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
Marcel Holtmann9c724352006-07-06 15:45:23 +0200323 file->private_data = data;
David Herrmann0dea0142012-03-28 11:48:42 +0200324 nonseekable_open(inode, file);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700325
Marcel Holtmann23424c02013-09-02 10:41:39 -0700326 schedule_delayed_work(&data->open_timeout, msecs_to_jiffies(1000));
327
David Herrmann0dea0142012-03-28 11:48:42 +0200328 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329}
330
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700331static int vhci_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200333 struct vhci_data *data = file->private_data;
334 struct hci_dev *hdev = data->hdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Marcel Holtmann23424c02013-09-02 10:41:39 -0700336 cancel_delayed_work_sync(&data->open_timeout);
337
338 if (hdev) {
339 hci_unregister_dev(hdev);
340 hci_free_dev(hdev);
341 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343 file->private_data = NULL;
David Herrmannbf18c712012-01-07 15:47:14 +0100344 kfree(data);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 return 0;
347}
348
Arjan van de Ven2b8693c2007-02-12 00:55:32 -0800349static const struct file_operations vhci_fops = {
Marcel Holtmannfed4c252009-12-03 18:07:28 +0100350 .owner = THIS_MODULE,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700351 .read = vhci_read,
Marcel Holtmann5bc00b52013-12-28 21:57:14 -0800352 .aio_write = vhci_write,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700353 .poll = vhci_poll,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700354 .open = vhci_open,
355 .release = vhci_release,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200356 .llseek = no_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357};
358
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700359static struct miscdevice vhci_miscdev= {
Marcel Holtmannac284942009-06-07 18:09:57 +0200360 .name = "vhci",
361 .fops = &vhci_fops,
362 .minor = MISC_DYNAMIC_MINOR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363};
364
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700365static int __init vhci_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366{
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700367 BT_INFO("Virtual HCI driver ver %s", VERSION);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
Marcel Holtmann329ab1b2009-12-03 18:05:16 +0100369 return misc_register(&vhci_miscdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370}
371
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700372static void __exit vhci_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373{
Marcel Holtmann329ab1b2009-12-03 18:05:16 +0100374 misc_deregister(&vhci_miscdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375}
376
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700377module_init(vhci_init);
378module_exit(vhci_exit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
Andrei Emeltchenko36acbb12011-11-14 12:42:48 +0200380module_param(amp, bool, 0644);
381MODULE_PARM_DESC(amp, "Create AMP controller device");
382
Marcel Holtmann63fbd242008-08-18 13:23:53 +0200383MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700384MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
385MODULE_VERSION(VERSION);
386MODULE_LICENSE("GPL");
Marcel Holtmannbfacbb92013-08-26 22:02:38 -0700387MODULE_ALIAS("devname:vhci");