blob: fc2130f1776a8e1b720fad46cb3e8b5e848fe75e [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 Holtmann4aa769b2005-08-09 20:27:37 -070042#ifndef CONFIG_BT_HCIVHCI_DEBUG
43#undef BT_DBG
44#define BT_DBG(D...)
45#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070047#define VERSION "1.2"
48
49static int minor = MISC_DYNAMIC_MINOR;
50
51struct vhci_data {
52 struct hci_dev *hdev;
53
54 unsigned long flags;
55
56 wait_queue_head_t read_wait;
57 struct sk_buff_head readq;
58
59 struct fasync_struct *fasync;
60};
61
62#define VHCI_FASYNC 0x0010
63
64static struct miscdevice vhci_miscdev;
65
66static int vhci_open_dev(struct hci_dev *hdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070067{
68 set_bit(HCI_RUNNING, &hdev->flags);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070069
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 return 0;
71}
72
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070073static int vhci_close_dev(struct hci_dev *hdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074{
Marcel Holtmann9c724352006-07-06 15:45:23 +020075 struct vhci_data *data = hdev->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
78 return 0;
79
Marcel Holtmann9c724352006-07-06 15:45:23 +020080 skb_queue_purge(&data->readq);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070081
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 return 0;
83}
84
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070085static int vhci_flush(struct hci_dev *hdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
Marcel Holtmann9c724352006-07-06 15:45:23 +020087 struct vhci_data *data = hdev->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Marcel Holtmann9c724352006-07-06 15:45:23 +020089 skb_queue_purge(&data->readq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070091 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092}
93
Marcel Holtmann4aa769b2005-08-09 20:27:37 -070094static int vhci_send_frame(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
96 struct hci_dev* hdev = (struct hci_dev *) skb->dev;
Marcel Holtmann9c724352006-07-06 15:45:23 +020097 struct vhci_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99 if (!hdev) {
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700100 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 return -ENODEV;
102 }
103
104 if (!test_bit(HCI_RUNNING, &hdev->flags))
105 return -EBUSY;
106
Marcel Holtmann9c724352006-07-06 15:45:23 +0200107 data = hdev->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700109 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
Marcel Holtmann9c724352006-07-06 15:45:23 +0200110 skb_queue_tail(&data->readq, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Marcel Holtmann9c724352006-07-06 15:45:23 +0200112 if (data->flags & VHCI_FASYNC)
113 kill_fasync(&data->fasync, SIGIO, POLL_IN);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700114
Marcel Holtmann9c724352006-07-06 15:45:23 +0200115 wake_up_interruptible(&data->read_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117 return 0;
118}
119
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700120static void vhci_destruct(struct hci_dev *hdev)
121{
122 kfree(hdev->driver_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123}
124
Marcel Holtmann9c724352006-07-06 15:45:23 +0200125static inline ssize_t vhci_get_user(struct vhci_data *data,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700126 const char __user *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127{
128 struct sk_buff *skb;
129
130 if (count > HCI_MAX_FRAME_SIZE)
131 return -EINVAL;
132
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700133 skb = bt_skb_alloc(count, GFP_KERNEL);
134 if (!skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 return -ENOMEM;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 if (copy_from_user(skb_put(skb, count), buf, count)) {
138 kfree_skb(skb);
139 return -EFAULT;
140 }
141
Marcel Holtmann9c724352006-07-06 15:45:23 +0200142 skb->dev = (void *) data->hdev;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700143 bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 skb_pull(skb, 1);
145
146 hci_recv_frame(skb);
147
148 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149}
150
Marcel Holtmann9c724352006-07-06 15:45:23 +0200151static inline ssize_t vhci_put_user(struct vhci_data *data,
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700152 struct sk_buff *skb, char __user *buf, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 char __user *ptr = buf;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700155 int len, total = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700157 len = min_t(unsigned int, skb->len, count);
158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 if (copy_to_user(ptr, skb->data, len))
160 return -EFAULT;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 total += len;
163
Marcel Holtmann9c724352006-07-06 15:45:23 +0200164 data->hdev->stat.byte_tx += len;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700165
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700166 switch (bt_cb(skb)->pkt_type) {
167 case HCI_COMMAND_PKT:
Marcel Holtmann9c724352006-07-06 15:45:23 +0200168 data->hdev->stat.cmd_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700169 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700171 case HCI_ACLDATA_PKT:
Marcel Holtmann9c724352006-07-06 15:45:23 +0200172 data->hdev->stat.acl_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700173 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700175 case HCI_SCODATA_PKT:
Marcel Holtmann9c724352006-07-06 15:45:23 +0200176 data->hdev->stat.cmd_tx++;
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700177 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 };
179
180 return total;
181}
182
Marcel Holtmann9c724352006-07-06 15:45:23 +0200183static loff_t vhci_llseek(struct file *file, loff_t offset, int origin)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700185 return -ESPIPE;
186}
187
Marcel Holtmann9c724352006-07-06 15:45:23 +0200188static ssize_t vhci_read(struct file *file,
189 char __user *buf, size_t count, loff_t *pos)
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700190{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 DECLARE_WAITQUEUE(wait, current);
Marcel Holtmann9c724352006-07-06 15:45:23 +0200192 struct vhci_data *data = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 struct sk_buff *skb;
194 ssize_t ret = 0;
195
Marcel Holtmann9c724352006-07-06 15:45:23 +0200196 add_wait_queue(&data->read_wait, &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 while (count) {
198 set_current_state(TASK_INTERRUPTIBLE);
199
Marcel Holtmann9c724352006-07-06 15:45:23 +0200200 skb = skb_dequeue(&data->readq);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700201 if (!skb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 if (file->f_flags & O_NONBLOCK) {
203 ret = -EAGAIN;
204 break;
205 }
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 if (signal_pending(current)) {
208 ret = -ERESTARTSYS;
209 break;
210 }
211
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 schedule();
213 continue;
214 }
215
216 if (access_ok(VERIFY_WRITE, buf, count))
Marcel Holtmann9c724352006-07-06 15:45:23 +0200217 ret = vhci_put_user(data, skb, buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 else
219 ret = -EFAULT;
220
221 kfree_skb(skb);
222 break;
223 }
224 set_current_state(TASK_RUNNING);
Marcel Holtmann9c724352006-07-06 15:45:23 +0200225 remove_wait_queue(&data->read_wait, &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
227 return ret;
228}
229
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700230static ssize_t vhci_write(struct file *file,
231 const char __user *buf, size_t count, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200233 struct vhci_data *data = file->private_data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700234
235 if (!access_ok(VERIFY_READ, buf, count))
236 return -EFAULT;
237
Marcel Holtmann9c724352006-07-06 15:45:23 +0200238 return vhci_get_user(data, buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239}
240
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700241static unsigned int vhci_poll(struct file *file, poll_table *wait)
242{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200243 struct vhci_data *data = file->private_data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700244
Marcel Holtmann9c724352006-07-06 15:45:23 +0200245 poll_wait(file, &data->read_wait, wait);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700246
Marcel Holtmann9c724352006-07-06 15:45:23 +0200247 if (!skb_queue_empty(&data->readq))
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700248 return POLLIN | POLLRDNORM;
249
250 return POLLOUT | POLLWRNORM;
251}
252
253static int vhci_ioctl(struct inode *inode, struct file *file,
254 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255{
256 return -EINVAL;
257}
258
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700259static int vhci_open(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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 struct hci_dev *hdev;
263
Marcel Holtmann9c724352006-07-06 15:45:23 +0200264 data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
265 if (!data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 return -ENOMEM;
267
Marcel Holtmann9c724352006-07-06 15:45:23 +0200268 skb_queue_head_init(&data->readq);
269 init_waitqueue_head(&data->read_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 hdev = hci_alloc_dev();
272 if (!hdev) {
Marcel Holtmann9c724352006-07-06 15:45:23 +0200273 kfree(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 return -ENOMEM;
275 }
276
Marcel Holtmann9c724352006-07-06 15:45:23 +0200277 data->hdev = hdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279 hdev->type = HCI_VHCI;
Marcel Holtmann9c724352006-07-06 15:45:23 +0200280 hdev->driver_data = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700282 hdev->open = vhci_open_dev;
283 hdev->close = vhci_close_dev;
284 hdev->flush = vhci_flush;
285 hdev->send = vhci_send_frame;
286 hdev->destruct = vhci_destruct;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
288 hdev->owner = THIS_MODULE;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700289
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 if (hci_register_dev(hdev) < 0) {
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700291 BT_ERR("Can't register HCI device");
Marcel Holtmann9c724352006-07-06 15:45:23 +0200292 kfree(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 hci_free_dev(hdev);
294 return -EBUSY;
295 }
296
Marcel Holtmann9c724352006-07-06 15:45:23 +0200297 file->private_data = data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700298
299 return nonseekable_open(inode, file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300}
301
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700302static int vhci_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200304 struct vhci_data *data = file->private_data;
305 struct hci_dev *hdev = data->hdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307 if (hci_unregister_dev(hdev) < 0) {
308 BT_ERR("Can't unregister HCI device %s", hdev->name);
309 }
310
311 hci_free_dev(hdev);
312
313 file->private_data = NULL;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 return 0;
316}
317
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700318static int vhci_fasync(int fd, struct file *file, int on)
319{
Marcel Holtmann9c724352006-07-06 15:45:23 +0200320 struct vhci_data *data = file->private_data;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700321 int err;
322
Marcel Holtmann9c724352006-07-06 15:45:23 +0200323 err = fasync_helper(fd, file, on, &data->fasync);
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700324 if (err < 0)
325 return err;
326
327 if (on)
Marcel Holtmann9c724352006-07-06 15:45:23 +0200328 data->flags |= VHCI_FASYNC;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700329 else
Marcel Holtmann9c724352006-07-06 15:45:23 +0200330 data->flags &= ~VHCI_FASYNC;
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700331
332 return 0;
333}
334
335static struct file_operations vhci_fops = {
336 .owner = THIS_MODULE,
337 .llseek = vhci_llseek,
338 .read = vhci_read,
339 .write = vhci_write,
340 .poll = vhci_poll,
341 .ioctl = vhci_ioctl,
342 .open = vhci_open,
343 .release = vhci_release,
344 .fasync = vhci_fasync,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345};
346
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700347static struct miscdevice vhci_miscdev= {
348 .name = "vhci",
349 .fops = &vhci_fops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350};
351
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700352static int __init vhci_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353{
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700354 BT_INFO("Virtual HCI driver ver %s", VERSION);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700356 vhci_miscdev.minor = minor;
357
358 if (misc_register(&vhci_miscdev) < 0) {
359 BT_ERR("Can't register misc device with minor %d", minor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 return -EIO;
361 }
362
363 return 0;
364}
365
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700366static void __exit vhci_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367{
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700368 if (misc_deregister(&vhci_miscdev) < 0)
369 BT_ERR("Can't unregister misc device with minor %d", minor);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370}
371
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700372module_init(vhci_init);
373module_exit(vhci_exit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374
Marcel Holtmann4aa769b2005-08-09 20:27:37 -0700375module_param(minor, int, 0444);
376MODULE_PARM_DESC(minor, "Miscellaneous minor device number");
377
378MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
379MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
380MODULE_VERSION(VERSION);
381MODULE_LICENSE("GPL");