Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 | 2 | * |
4aa769b9 MH |
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 | * | |
1da177e4 | 24 | */ |
1da177e4 LT |
25 | |
26 | #include <linux/config.h> | |
27 | #include <linux/module.h> | |
28 | ||
1da177e4 | 29 | #include <linux/kernel.h> |
4aa769b9 | 30 | #include <linux/init.h> |
1da177e4 | 31 | #include <linux/slab.h> |
4aa769b9 MH |
32 | #include <linux/types.h> |
33 | #include <linux/errno.h> | |
34 | #include <linux/sched.h> | |
1da177e4 | 35 | #include <linux/poll.h> |
1da177e4 LT |
36 | |
37 | #include <linux/skbuff.h> | |
38 | #include <linux/miscdevice.h> | |
39 | ||
1da177e4 LT |
40 | #include <net/bluetooth/bluetooth.h> |
41 | #include <net/bluetooth/hci_core.h> | |
1da177e4 | 42 | |
4aa769b9 MH |
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; | |
1da177e4 | 51 | |
4aa769b9 MH |
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) | |
1da177e4 LT |
68 | { |
69 | set_bit(HCI_RUNNING, &hdev->flags); | |
1da177e4 | 70 | |
1da177e4 LT |
71 | return 0; |
72 | } | |
73 | ||
4aa769b9 | 74 | static int vhci_close_dev(struct hci_dev *hdev) |
1da177e4 | 75 | { |
4aa769b9 MH |
76 | struct vhci_data *vhci = hdev->driver_data; |
77 | ||
1da177e4 LT |
78 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) |
79 | return 0; | |
80 | ||
4aa769b9 MH |
81 | skb_queue_purge(&vhci->readq); |
82 | ||
1da177e4 LT |
83 | return 0; |
84 | } | |
85 | ||
4aa769b9 | 86 | static int vhci_flush(struct hci_dev *hdev) |
1da177e4 | 87 | { |
4aa769b9 | 88 | struct vhci_data *vhci = hdev->driver_data; |
1da177e4 | 89 | |
4aa769b9 | 90 | skb_queue_purge(&vhci->readq); |
1da177e4 | 91 | |
4aa769b9 | 92 | return 0; |
1da177e4 LT |
93 | } |
94 | ||
4aa769b9 | 95 | static int vhci_send_frame(struct sk_buff *skb) |
1da177e4 LT |
96 | { |
97 | struct hci_dev* hdev = (struct hci_dev *) skb->dev; | |
4aa769b9 | 98 | struct vhci_data *vhci; |
1da177e4 LT |
99 | |
100 | if (!hdev) { | |
4aa769b9 | 101 | BT_ERR("Frame for unknown HCI device (hdev=NULL)"); |
1da177e4 LT |
102 | return -ENODEV; |
103 | } | |
104 | ||
105 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
106 | return -EBUSY; | |
107 | ||
4aa769b9 | 108 | vhci = hdev->driver_data; |
1da177e4 | 109 | |
0d48d939 | 110 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); |
4aa769b9 MH |
111 | skb_queue_tail(&vhci->readq, skb); |
112 | ||
113 | if (vhci->flags & VHCI_FASYNC) | |
114 | kill_fasync(&vhci->fasync, SIGIO, POLL_IN); | |
1da177e4 | 115 | |
4aa769b9 | 116 | wake_up_interruptible(&vhci->read_wait); |
1da177e4 LT |
117 | |
118 | return 0; | |
119 | } | |
120 | ||
4aa769b9 MH |
121 | static void vhci_destruct(struct hci_dev *hdev) |
122 | { | |
123 | kfree(hdev->driver_data); | |
1da177e4 LT |
124 | } |
125 | ||
4aa769b9 MH |
126 | static inline ssize_t vhci_get_user(struct vhci_data *vhci, |
127 | const char __user *buf, size_t count) | |
1da177e4 LT |
128 | { |
129 | struct sk_buff *skb; | |
130 | ||
131 | if (count > HCI_MAX_FRAME_SIZE) | |
132 | return -EINVAL; | |
133 | ||
4aa769b9 MH |
134 | skb = bt_skb_alloc(count, GFP_KERNEL); |
135 | if (!skb) | |
1da177e4 | 136 | return -ENOMEM; |
4aa769b9 | 137 | |
1da177e4 LT |
138 | if (copy_from_user(skb_put(skb, count), buf, count)) { |
139 | kfree_skb(skb); | |
140 | return -EFAULT; | |
141 | } | |
142 | ||
4aa769b9 | 143 | skb->dev = (void *) vhci->hdev; |
0d48d939 | 144 | bt_cb(skb)->pkt_type = *((__u8 *) skb->data); |
1da177e4 LT |
145 | skb_pull(skb, 1); |
146 | ||
147 | hci_recv_frame(skb); | |
148 | ||
149 | return count; | |
1da177e4 LT |
150 | } |
151 | ||
4aa769b9 MH |
152 | static inline ssize_t vhci_put_user(struct vhci_data *vhci, |
153 | struct sk_buff *skb, char __user *buf, int count) | |
1da177e4 | 154 | { |
1da177e4 | 155 | char __user *ptr = buf; |
4aa769b9 MH |
156 | int len, total = 0; |
157 | ||
158 | len = min_t(unsigned int, skb->len, count); | |
1da177e4 | 159 | |
1da177e4 LT |
160 | if (copy_to_user(ptr, skb->data, len)) |
161 | return -EFAULT; | |
4aa769b9 | 162 | |
1da177e4 LT |
163 | total += len; |
164 | ||
4aa769b9 MH |
165 | vhci->hdev->stat.byte_tx += len; |
166 | ||
0d48d939 MH |
167 | switch (bt_cb(skb)->pkt_type) { |
168 | case HCI_COMMAND_PKT: | |
169 | vhci->hdev->stat.cmd_tx++; | |
170 | break; | |
1da177e4 | 171 | |
0d48d939 MH |
172 | case HCI_ACLDATA_PKT: |
173 | vhci->hdev->stat.acl_tx++; | |
174 | break; | |
1da177e4 | 175 | |
0d48d939 MH |
176 | case HCI_SCODATA_PKT: |
177 | vhci->hdev->stat.cmd_tx++; | |
178 | break; | |
1da177e4 LT |
179 | }; |
180 | ||
181 | return total; | |
182 | } | |
183 | ||
4aa769b9 MH |
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) | |
1da177e4 | 190 | { |
1da177e4 | 191 | DECLARE_WAITQUEUE(wait, current); |
4aa769b9 | 192 | struct vhci_data *vhci = file->private_data; |
1da177e4 LT |
193 | struct sk_buff *skb; |
194 | ssize_t ret = 0; | |
195 | ||
4aa769b9 | 196 | add_wait_queue(&vhci->read_wait, &wait); |
1da177e4 LT |
197 | while (count) { |
198 | set_current_state(TASK_INTERRUPTIBLE); | |
199 | ||
4aa769b9 MH |
200 | skb = skb_dequeue(&vhci->readq); |
201 | if (!skb) { | |
1da177e4 LT |
202 | if (file->f_flags & O_NONBLOCK) { |
203 | ret = -EAGAIN; | |
204 | break; | |
205 | } | |
4aa769b9 | 206 | |
1da177e4 LT |
207 | if (signal_pending(current)) { |
208 | ret = -ERESTARTSYS; | |
209 | break; | |
210 | } | |
211 | ||
1da177e4 LT |
212 | schedule(); |
213 | continue; | |
214 | } | |
215 | ||
216 | if (access_ok(VERIFY_WRITE, buf, count)) | |
4aa769b9 | 217 | ret = vhci_put_user(vhci, skb, buf, count); |
1da177e4 LT |
218 | else |
219 | ret = -EFAULT; | |
220 | ||
221 | kfree_skb(skb); | |
222 | break; | |
223 | } | |
224 | set_current_state(TASK_RUNNING); | |
4aa769b9 | 225 | remove_wait_queue(&vhci->read_wait, &wait); |
1da177e4 LT |
226 | |
227 | return ret; | |
228 | } | |
229 | ||
4aa769b9 MH |
230 | static ssize_t vhci_write(struct file *file, |
231 | const char __user *buf, size_t count, loff_t *pos) | |
1da177e4 | 232 | { |
4aa769b9 | 233 | struct vhci_data *vhci = file->private_data; |
1da177e4 | 234 | |
4aa769b9 MH |
235 | if (!access_ok(VERIFY_READ, buf, count)) |
236 | return -EFAULT; | |
237 | ||
238 | return vhci_get_user(vhci, buf, count); | |
1da177e4 LT |
239 | } |
240 | ||
4aa769b9 | 241 | static unsigned int vhci_poll(struct file *file, poll_table *wait) |
1da177e4 | 242 | { |
4aa769b9 | 243 | struct vhci_data *vhci = file->private_data; |
1da177e4 | 244 | |
4aa769b9 | 245 | poll_wait(file, &vhci->read_wait, wait); |
1da177e4 | 246 | |
4aa769b9 MH |
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; | |
1da177e4 LT |
257 | } |
258 | ||
4aa769b9 | 259 | static int vhci_open(struct inode *inode, struct file *file) |
1da177e4 | 260 | { |
4aa769b9 | 261 | struct vhci_data *vhci; |
1da177e4 LT |
262 | struct hci_dev *hdev; |
263 | ||
089b1dbb | 264 | vhci = kzalloc(sizeof(struct vhci_data), GFP_KERNEL); |
4aa769b9 | 265 | if (!vhci) |
1da177e4 LT |
266 | return -ENOMEM; |
267 | ||
4aa769b9 MH |
268 | skb_queue_head_init(&vhci->readq); |
269 | init_waitqueue_head(&vhci->read_wait); | |
1da177e4 | 270 | |
1da177e4 LT |
271 | hdev = hci_alloc_dev(); |
272 | if (!hdev) { | |
4aa769b9 | 273 | kfree(vhci); |
1da177e4 LT |
274 | return -ENOMEM; |
275 | } | |
276 | ||
4aa769b9 | 277 | vhci->hdev = hdev; |
1da177e4 LT |
278 | |
279 | hdev->type = HCI_VHCI; | |
4aa769b9 MH |
280 | hdev->driver_data = vhci; |
281 | SET_HCIDEV_DEV(hdev, vhci_miscdev.dev); | |
1da177e4 | 282 | |
4aa769b9 MH |
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; | |
1da177e4 LT |
288 | |
289 | hdev->owner = THIS_MODULE; | |
4aa769b9 | 290 | |
1da177e4 | 291 | if (hci_register_dev(hdev) < 0) { |
4aa769b9 MH |
292 | BT_ERR("Can't register HCI device"); |
293 | kfree(vhci); | |
1da177e4 LT |
294 | hci_free_dev(hdev); |
295 | return -EBUSY; | |
296 | } | |
297 | ||
4aa769b9 MH |
298 | file->private_data = vhci; |
299 | ||
300 | return nonseekable_open(inode, file); | |
1da177e4 LT |
301 | } |
302 | ||
4aa769b9 | 303 | static int vhci_release(struct inode *inode, struct file *file) |
1da177e4 | 304 | { |
4aa769b9 MH |
305 | struct vhci_data *vhci = file->private_data; |
306 | struct hci_dev *hdev = vhci->hdev; | |
1da177e4 LT |
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; | |
4aa769b9 MH |
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 | ||
1da177e4 LT |
333 | return 0; |
334 | } | |
335 | ||
4aa769b9 MH |
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, | |
1da177e4 LT |
346 | }; |
347 | ||
4aa769b9 MH |
348 | static struct miscdevice vhci_miscdev= { |
349 | .name = "vhci", | |
350 | .fops = &vhci_fops, | |
1da177e4 LT |
351 | }; |
352 | ||
4aa769b9 | 353 | static int __init vhci_init(void) |
1da177e4 | 354 | { |
4aa769b9 | 355 | BT_INFO("Virtual HCI driver ver %s", VERSION); |
1da177e4 | 356 | |
4aa769b9 MH |
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); | |
1da177e4 LT |
361 | return -EIO; |
362 | } | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
4aa769b9 | 367 | static void __exit vhci_exit(void) |
1da177e4 | 368 | { |
4aa769b9 MH |
369 | if (misc_deregister(&vhci_miscdev) < 0) |
370 | BT_ERR("Can't unregister misc device with minor %d", minor); | |
1da177e4 LT |
371 | } |
372 | ||
4aa769b9 MH |
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"); | |
1da177e4 | 378 | |
4aa769b9 MH |
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"); |