1 /*
2 *
3 * Bluetooth virtual HCI driver
4 *
5 * Copyright (C) 2000-2001 Qualcomm Incorporated
6 * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
7 * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
8 *
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 *
24 */
25
26 #include <linux/config.h>
27 #include <linux/module.h>
28
29 #include <linux/kernel.h>
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/types.h>
33 #include <linux/errno.h>
34 #include <linux/sched.h>
35 #include <linux/poll.h>
36
37 #include <linux/skbuff.h>
38 #include <linux/miscdevice.h>
39
40 #include <net/bluetooth/bluetooth.h>
41 #include <net/bluetooth/hci_core.h>
42
43 #ifndef CONFIG_BT_HCIVHCI_DEBUG
44 #undef BT_DBG
45 #define BT_DBG(D...)
46 #endif
47
48 #define VERSION "1.2"
49
50 static int minor = MISC_DYNAMIC_MINOR;
51
52 struct vhci_data {
53 struct hci_dev *hdev;
54
55 unsigned long flags;
56
57 wait_queue_head_t read_wait;
58 struct sk_buff_head readq;
59
60 struct fasync_struct *fasync;
61 };
62
63 #define VHCI_FASYNC 0x0010
64
65 static struct miscdevice vhci_miscdev;
66
67 static int vhci_open_dev(struct hci_dev *hdev)
68 {
69 set_bit(HCI_RUNNING, &hdev->flags);
70
71 return 0;
72 }
73
74 static int vhci_close_dev(struct hci_dev *hdev)
75 {
76 struct vhci_data *vhci = hdev->driver_data;
77
78 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
79 return 0;
80
81 skb_queue_purge(&vhci->readq);
82
83 return 0;
84 }
85
86 static int vhci_flush(struct hci_dev *hdev)
87 {
88 struct vhci_data *vhci = hdev->driver_data;
89
90 skb_queue_purge(&vhci->readq);
91
92 return 0;
93 }
94
95 static int vhci_send_frame(struct sk_buff *skb)
96 {
97 struct hci_dev* hdev = (struct hci_dev *) skb->dev;
98 struct vhci_data *vhci;
99
100 if (!hdev) {
101 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
102 return -ENODEV;
103 }
104
105 if (!test_bit(HCI_RUNNING, &hdev->flags))
106 return -EBUSY;
107
108 vhci = hdev->driver_data;
109
110 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
111 skb_queue_tail(&vhci->readq, skb);
112
113 if (vhci->flags & VHCI_FASYNC)
114 kill_fasync(&vhci->fasync, SIGIO, POLL_IN);
115
116 wake_up_interruptible(&vhci->read_wait);
117
118 return 0;
119 }
120
121 static void vhci_destruct(struct hci_dev *hdev)
122 {
123 kfree(hdev->driver_data);
124 }
125
126 static inline ssize_t vhci_get_user(struct vhci_data *vhci,
127 const char __user *buf, size_t count)
128 {
129 struct sk_buff *skb;
130
131 if (count > HCI_MAX_FRAME_SIZE)
132 return -EINVAL;
133
134 skb = bt_skb_alloc(count, GFP_KERNEL);
135 if (!skb)
136 return -ENOMEM;
137
138 if (copy_from_user(skb_put(skb, count), buf, count)) {
139 kfree_skb(skb);
140 return -EFAULT;
141 }
142
143 skb->dev = (void *) vhci->hdev;
144 bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
145 skb_pull(skb, 1);
146
147 hci_recv_frame(skb);
148
149 return count;
150 }
151
152 static inline ssize_t vhci_put_user(struct vhci_data *vhci,
153 struct sk_buff *skb, char __user *buf, int count)
154 {
155 char __user *ptr = buf;
156 int len, total = 0;
157
158 len = min_t(unsigned int, skb->len, count);
159
160 if (copy_to_user(ptr, skb->data, len))
161 return -EFAULT;
162
163 total += len;
164
165 vhci->hdev->stat.byte_tx += len;
166
167 switch (bt_cb(skb)->pkt_type) {
168 case HCI_COMMAND_PKT:
169 vhci->hdev->stat.cmd_tx++;
170 break;
171
172 case HCI_ACLDATA_PKT:
173 vhci->hdev->stat.acl_tx++;
174 break;
175
176 case HCI_SCODATA_PKT:
177 vhci->hdev->stat.cmd_tx++;
178 break;
179 };
180
181 return total;
182 }
183
184 static loff_t vhci_llseek(struct file * file, loff_t offset, int origin)
185 {
186 return -ESPIPE;
187 }
188
189 static ssize_t vhci_read(struct file * file, char __user * buf, size_t count, loff_t *pos)
190 {
191 DECLARE_WAITQUEUE(wait, current);
192 struct vhci_data *vhci = file->private_data;
193 struct sk_buff *skb;
194 ssize_t ret = 0;
195
196 add_wait_queue(&vhci->read_wait, &wait);
197 while (count) {
198 set_current_state(TASK_INTERRUPTIBLE);
199
200 skb = skb_dequeue(&vhci->readq);
201 if (!skb) {
202 if (file->f_flags & O_NONBLOCK) {
203 ret = -EAGAIN;
204 break;
205 }
206
207 if (signal_pending(current)) {
208 ret = -ERESTARTSYS;
209 break;
210 }
211
212 schedule();
213 continue;
214 }
215
216 if (access_ok(VERIFY_WRITE, buf, count))
217 ret = vhci_put_user(vhci, skb, buf, count);
218 else
219 ret = -EFAULT;
220
221 kfree_skb(skb);
222 break;
223 }
224 set_current_state(TASK_RUNNING);
225 remove_wait_queue(&vhci->read_wait, &wait);
226
227 return ret;
228 }
229
230 static ssize_t vhci_write(struct file *file,
231 const char __user *buf, size_t count, loff_t *pos)
232 {
233 struct vhci_data *vhci = file->private_data;
234
235 if (!access_ok(VERIFY_READ, buf, count))
236 return -EFAULT;
237
238 return vhci_get_user(vhci, buf, count);
239 }
240
241 static unsigned int vhci_poll(struct file *file, poll_table *wait)
242 {
243 struct vhci_data *vhci = file->private_data;
244
245 poll_wait(file, &vhci->read_wait, wait);
246
247 if (!skb_queue_empty(&vhci->readq))
248 return POLLIN | POLLRDNORM;
249
250 return POLLOUT | POLLWRNORM;
251 }
252
253 static int vhci_ioctl(struct inode *inode, struct file *file,
254 unsigned int cmd, unsigned long arg)
255 {
256 return -EINVAL;
257 }
258
259 static int vhci_open(struct inode *inode, struct file *file)
260 {
261 struct vhci_data *vhci;
262 struct hci_dev *hdev;
263
264 vhci = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
265 if (!vhci)
266 return -ENOMEM;
267
268 skb_queue_head_init(&vhci->readq);
269 init_waitqueue_head(&vhci->read_wait);
270
271 hdev = hci_alloc_dev();
272 if (!hdev) {
273 kfree(vhci);
274 return -ENOMEM;
275 }
276
277 vhci->hdev = hdev;
278
279 hdev->type = HCI_VHCI;
280 hdev->driver_data = vhci;
281 SET_HCIDEV_DEV(hdev, vhci_miscdev.dev);
282
283 hdev->open = vhci_open_dev;
284 hdev->close = vhci_close_dev;
285 hdev->flush = vhci_flush;
286 hdev->send = vhci_send_frame;
287 hdev->destruct = vhci_destruct;
288
289 hdev->owner = THIS_MODULE;
290
291 if (hci_register_dev(hdev) < 0) {
292 BT_ERR("Can't register HCI device");
293 kfree(vhci);
294 hci_free_dev(hdev);
295 return -EBUSY;
296 }
297
298 file->private_data = vhci;
299
300 return nonseekable_open(inode, file);
301 }
302
303 static int vhci_release(struct inode *inode, struct file *file)
304 {
305 struct vhci_data *vhci = file->private_data;
306 struct hci_dev *hdev = vhci->hdev;
307
308 if (hci_unregister_dev(hdev) < 0) {
309 BT_ERR("Can't unregister HCI device %s", hdev->name);
310 }
311
312 hci_free_dev(hdev);
313
314 file->private_data = NULL;
315
316 return 0;
317 }
318
319 static int vhci_fasync(int fd, struct file *file, int on)
320 {
321 struct vhci_data *vhci = file->private_data;
322 int err;
323
324 err = fasync_helper(fd, file, on, &vhci->fasync);
325 if (err < 0)
326 return err;
327
328 if (on)
329 vhci->flags |= VHCI_FASYNC;
330 else
331 vhci->flags &= ~VHCI_FASYNC;
332
333 return 0;
334 }
335
336 static struct file_operations vhci_fops = {
337 .owner = THIS_MODULE,
338 .llseek = vhci_llseek,
339 .read = vhci_read,
340 .write = vhci_write,
341 .poll = vhci_poll,
342 .ioctl = vhci_ioctl,
343 .open = vhci_open,
344 .release = vhci_release,
345 .fasync = vhci_fasync,
346 };
347
348 static struct miscdevice vhci_miscdev= {
349 .name = "vhci",
350 .fops = &vhci_fops,
351 };
352
353 static int __init vhci_init(void)
354 {
355 BT_INFO("Virtual HCI driver ver %s", VERSION);
356
357 vhci_miscdev.minor = minor;
358
359 if (misc_register(&vhci_miscdev) < 0) {
360 BT_ERR("Can't register misc device with minor %d", minor);
361 return -EIO;
362 }
363
364 return 0;
365 }
366
367 static void __exit vhci_exit(void)
368 {
369 if (misc_deregister(&vhci_miscdev) < 0)
370 BT_ERR("Can't unregister misc device with minor %d", minor);
371 }
372
373 module_init(vhci_init);
374 module_exit(vhci_exit);
375
376 module_param(minor, int, 0444);
377 MODULE_PARM_DESC(minor, "Miscellaneous minor device number");
378
379 MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
380 MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
381 MODULE_VERSION(VERSION);
382 MODULE_LICENSE("GPL");
383
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