Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 | 2 | * |
4aa769b9 MH |
3 | * Bluetooth virtual HCI driver |
4 | * | |
9c724357 MH |
5 | * 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> | |
4aa769b9 MH |
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 | 25 | |
1da177e4 LT |
26 | #include <linux/module.h> |
27 | ||
1da177e4 | 28 | #include <linux/kernel.h> |
4aa769b9 | 29 | #include <linux/init.h> |
1da177e4 | 30 | #include <linux/slab.h> |
8324af6d | 31 | #include <linux/smp_lock.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 | #define VERSION "1.2" |
44 | ||
45 | static int minor = MISC_DYNAMIC_MINOR; | |
1da177e4 | 46 | |
4aa769b9 MH |
47 | struct vhci_data { |
48 | struct hci_dev *hdev; | |
49 | ||
50 | unsigned long flags; | |
51 | ||
52 | wait_queue_head_t read_wait; | |
53 | struct sk_buff_head readq; | |
54 | ||
55 | struct fasync_struct *fasync; | |
56 | }; | |
57 | ||
58 | #define VHCI_FASYNC 0x0010 | |
59 | ||
60 | static struct miscdevice vhci_miscdev; | |
61 | ||
62 | static int vhci_open_dev(struct hci_dev *hdev) | |
1da177e4 LT |
63 | { |
64 | set_bit(HCI_RUNNING, &hdev->flags); | |
1da177e4 | 65 | |
1da177e4 LT |
66 | return 0; |
67 | } | |
68 | ||
4aa769b9 | 69 | static int vhci_close_dev(struct hci_dev *hdev) |
1da177e4 | 70 | { |
9c724357 | 71 | struct vhci_data *data = hdev->driver_data; |
4aa769b9 | 72 | |
1da177e4 LT |
73 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) |
74 | return 0; | |
75 | ||
9c724357 | 76 | skb_queue_purge(&data->readq); |
4aa769b9 | 77 | |
1da177e4 LT |
78 | return 0; |
79 | } | |
80 | ||
4aa769b9 | 81 | static int vhci_flush(struct hci_dev *hdev) |
1da177e4 | 82 | { |
9c724357 | 83 | struct vhci_data *data = hdev->driver_data; |
1da177e4 | 84 | |
9c724357 | 85 | skb_queue_purge(&data->readq); |
1da177e4 | 86 | |
4aa769b9 | 87 | return 0; |
1da177e4 LT |
88 | } |
89 | ||
4aa769b9 | 90 | static int vhci_send_frame(struct sk_buff *skb) |
1da177e4 LT |
91 | { |
92 | struct hci_dev* hdev = (struct hci_dev *) skb->dev; | |
9c724357 | 93 | struct vhci_data *data; |
1da177e4 LT |
94 | |
95 | if (!hdev) { | |
4aa769b9 | 96 | BT_ERR("Frame for unknown HCI device (hdev=NULL)"); |
1da177e4 LT |
97 | return -ENODEV; |
98 | } | |
99 | ||
100 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
101 | return -EBUSY; | |
102 | ||
9c724357 | 103 | data = hdev->driver_data; |
1da177e4 | 104 | |
0d48d939 | 105 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); |
9c724357 | 106 | skb_queue_tail(&data->readq, skb); |
4aa769b9 | 107 | |
9c724357 MH |
108 | if (data->flags & VHCI_FASYNC) |
109 | kill_fasync(&data->fasync, SIGIO, POLL_IN); | |
1da177e4 | 110 | |
9c724357 | 111 | wake_up_interruptible(&data->read_wait); |
1da177e4 LT |
112 | |
113 | return 0; | |
114 | } | |
115 | ||
4aa769b9 MH |
116 | static void vhci_destruct(struct hci_dev *hdev) |
117 | { | |
118 | kfree(hdev->driver_data); | |
1da177e4 LT |
119 | } |
120 | ||
9c724357 | 121 | static inline ssize_t vhci_get_user(struct vhci_data *data, |
4aa769b9 | 122 | const char __user *buf, size_t count) |
1da177e4 LT |
123 | { |
124 | struct sk_buff *skb; | |
125 | ||
126 | if (count > HCI_MAX_FRAME_SIZE) | |
127 | return -EINVAL; | |
128 | ||
4aa769b9 MH |
129 | skb = bt_skb_alloc(count, GFP_KERNEL); |
130 | if (!skb) | |
1da177e4 | 131 | return -ENOMEM; |
4aa769b9 | 132 | |
1da177e4 LT |
133 | if (copy_from_user(skb_put(skb, count), buf, count)) { |
134 | kfree_skb(skb); | |
135 | return -EFAULT; | |
136 | } | |
137 | ||
9c724357 | 138 | skb->dev = (void *) data->hdev; |
0d48d939 | 139 | bt_cb(skb)->pkt_type = *((__u8 *) skb->data); |
1da177e4 LT |
140 | skb_pull(skb, 1); |
141 | ||
142 | hci_recv_frame(skb); | |
143 | ||
144 | return count; | |
1da177e4 LT |
145 | } |
146 | ||
9c724357 | 147 | static inline ssize_t vhci_put_user(struct vhci_data *data, |
4aa769b9 | 148 | struct sk_buff *skb, char __user *buf, int count) |
1da177e4 | 149 | { |
1da177e4 | 150 | char __user *ptr = buf; |
4aa769b9 MH |
151 | int len, total = 0; |
152 | ||
153 | len = min_t(unsigned int, skb->len, count); | |
1da177e4 | 154 | |
1da177e4 LT |
155 | if (copy_to_user(ptr, skb->data, len)) |
156 | return -EFAULT; | |
4aa769b9 | 157 | |
1da177e4 LT |
158 | total += len; |
159 | ||
9c724357 | 160 | data->hdev->stat.byte_tx += len; |
4aa769b9 | 161 | |
0d48d939 MH |
162 | switch (bt_cb(skb)->pkt_type) { |
163 | case HCI_COMMAND_PKT: | |
9c724357 | 164 | data->hdev->stat.cmd_tx++; |
0d48d939 | 165 | break; |
1da177e4 | 166 | |
0d48d939 | 167 | case HCI_ACLDATA_PKT: |
9c724357 | 168 | data->hdev->stat.acl_tx++; |
0d48d939 | 169 | break; |
1da177e4 | 170 | |
0d48d939 | 171 | case HCI_SCODATA_PKT: |
9c724357 | 172 | data->hdev->stat.cmd_tx++; |
0d48d939 | 173 | break; |
1da177e4 LT |
174 | }; |
175 | ||
176 | return total; | |
177 | } | |
178 | ||
9c724357 MH |
179 | static ssize_t vhci_read(struct file *file, |
180 | char __user *buf, size_t count, loff_t *pos) | |
1da177e4 | 181 | { |
1da177e4 | 182 | DECLARE_WAITQUEUE(wait, current); |
9c724357 | 183 | struct vhci_data *data = file->private_data; |
1da177e4 LT |
184 | struct sk_buff *skb; |
185 | ssize_t ret = 0; | |
186 | ||
9c724357 | 187 | add_wait_queue(&data->read_wait, &wait); |
1da177e4 LT |
188 | while (count) { |
189 | set_current_state(TASK_INTERRUPTIBLE); | |
190 | ||
9c724357 | 191 | skb = skb_dequeue(&data->readq); |
4aa769b9 | 192 | if (!skb) { |
1da177e4 LT |
193 | if (file->f_flags & O_NONBLOCK) { |
194 | ret = -EAGAIN; | |
195 | break; | |
196 | } | |
4aa769b9 | 197 | |
1da177e4 LT |
198 | if (signal_pending(current)) { |
199 | ret = -ERESTARTSYS; | |
200 | break; | |
201 | } | |
202 | ||
1da177e4 LT |
203 | schedule(); |
204 | continue; | |
205 | } | |
206 | ||
207 | if (access_ok(VERIFY_WRITE, buf, count)) | |
9c724357 | 208 | ret = vhci_put_user(data, skb, buf, count); |
1da177e4 LT |
209 | else |
210 | ret = -EFAULT; | |
211 | ||
212 | kfree_skb(skb); | |
213 | break; | |
214 | } | |
215 | set_current_state(TASK_RUNNING); | |
9c724357 | 216 | remove_wait_queue(&data->read_wait, &wait); |
1da177e4 LT |
217 | |
218 | return ret; | |
219 | } | |
220 | ||
4aa769b9 MH |
221 | static ssize_t vhci_write(struct file *file, |
222 | const char __user *buf, size_t count, loff_t *pos) | |
1da177e4 | 223 | { |
9c724357 | 224 | struct vhci_data *data = file->private_data; |
1da177e4 | 225 | |
4aa769b9 MH |
226 | if (!access_ok(VERIFY_READ, buf, count)) |
227 | return -EFAULT; | |
228 | ||
9c724357 | 229 | return vhci_get_user(data, buf, count); |
1da177e4 LT |
230 | } |
231 | ||
4aa769b9 | 232 | static unsigned int vhci_poll(struct file *file, poll_table *wait) |
1da177e4 | 233 | { |
9c724357 | 234 | struct vhci_data *data = file->private_data; |
1da177e4 | 235 | |
9c724357 | 236 | poll_wait(file, &data->read_wait, wait); |
1da177e4 | 237 | |
9c724357 | 238 | if (!skb_queue_empty(&data->readq)) |
4aa769b9 MH |
239 | return POLLIN | POLLRDNORM; |
240 | ||
241 | return POLLOUT | POLLWRNORM; | |
242 | } | |
243 | ||
244 | static int vhci_ioctl(struct inode *inode, struct file *file, | |
245 | unsigned int cmd, unsigned long arg) | |
246 | { | |
247 | return -EINVAL; | |
1da177e4 LT |
248 | } |
249 | ||
4aa769b9 | 250 | static int vhci_open(struct inode *inode, struct file *file) |
1da177e4 | 251 | { |
9c724357 | 252 | struct vhci_data *data; |
1da177e4 LT |
253 | struct hci_dev *hdev; |
254 | ||
9c724357 MH |
255 | data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL); |
256 | if (!data) | |
1da177e4 LT |
257 | return -ENOMEM; |
258 | ||
9c724357 MH |
259 | skb_queue_head_init(&data->readq); |
260 | init_waitqueue_head(&data->read_wait); | |
1da177e4 | 261 | |
8324af6d | 262 | lock_kernel(); |
1da177e4 LT |
263 | hdev = hci_alloc_dev(); |
264 | if (!hdev) { | |
9c724357 | 265 | kfree(data); |
8324af6d | 266 | unlock_kernel(); |
1da177e4 LT |
267 | return -ENOMEM; |
268 | } | |
269 | ||
9c724357 | 270 | data->hdev = hdev; |
1da177e4 | 271 | |
0ac53939 | 272 | hdev->type = HCI_VIRTUAL; |
9c724357 | 273 | hdev->driver_data = data; |
1da177e4 | 274 | |
4aa769b9 MH |
275 | hdev->open = vhci_open_dev; |
276 | hdev->close = vhci_close_dev; | |
277 | hdev->flush = vhci_flush; | |
278 | hdev->send = vhci_send_frame; | |
279 | hdev->destruct = vhci_destruct; | |
1da177e4 LT |
280 | |
281 | hdev->owner = THIS_MODULE; | |
4aa769b9 | 282 | |
1da177e4 | 283 | if (hci_register_dev(hdev) < 0) { |
4aa769b9 | 284 | BT_ERR("Can't register HCI device"); |
9c724357 | 285 | kfree(data); |
1da177e4 | 286 | hci_free_dev(hdev); |
8324af6d | 287 | unlock_kernel(); |
1da177e4 LT |
288 | return -EBUSY; |
289 | } | |
290 | ||
9c724357 | 291 | file->private_data = data; |
8324af6d | 292 | unlock_kernel(); |
4aa769b9 MH |
293 | |
294 | return nonseekable_open(inode, file); | |
1da177e4 LT |
295 | } |
296 | ||
4aa769b9 | 297 | static int vhci_release(struct inode *inode, struct file *file) |
1da177e4 | 298 | { |
9c724357 MH |
299 | struct vhci_data *data = file->private_data; |
300 | struct hci_dev *hdev = data->hdev; | |
1da177e4 LT |
301 | |
302 | if (hci_unregister_dev(hdev) < 0) { | |
303 | BT_ERR("Can't unregister HCI device %s", hdev->name); | |
304 | } | |
305 | ||
306 | hci_free_dev(hdev); | |
307 | ||
308 | file->private_data = NULL; | |
4aa769b9 MH |
309 | |
310 | return 0; | |
311 | } | |
312 | ||
313 | static int vhci_fasync(int fd, struct file *file, int on) | |
314 | { | |
9c724357 | 315 | struct vhci_data *data = file->private_data; |
dbfb2df7 | 316 | int err = 0; |
4aa769b9 | 317 | |
dbfb2df7 | 318 | lock_kernel(); |
9c724357 | 319 | err = fasync_helper(fd, file, on, &data->fasync); |
4aa769b9 | 320 | if (err < 0) |
dbfb2df7 | 321 | goto out; |
4aa769b9 MH |
322 | |
323 | if (on) | |
9c724357 | 324 | data->flags |= VHCI_FASYNC; |
4aa769b9 | 325 | else |
9c724357 | 326 | data->flags &= ~VHCI_FASYNC; |
4aa769b9 | 327 | |
dbfb2df7 JC |
328 | out: |
329 | unlock_kernel(); | |
330 | return err; | |
1da177e4 LT |
331 | } |
332 | ||
2b8693c0 | 333 | static const struct file_operations vhci_fops = { |
4aa769b9 | 334 | .owner = THIS_MODULE, |
4aa769b9 MH |
335 | .read = vhci_read, |
336 | .write = vhci_write, | |
337 | .poll = vhci_poll, | |
338 | .ioctl = vhci_ioctl, | |
339 | .open = vhci_open, | |
340 | .release = vhci_release, | |
341 | .fasync = vhci_fasync, | |
1da177e4 LT |
342 | }; |
343 | ||
4aa769b9 MH |
344 | static struct miscdevice vhci_miscdev= { |
345 | .name = "vhci", | |
346 | .fops = &vhci_fops, | |
1da177e4 LT |
347 | }; |
348 | ||
4aa769b9 | 349 | static int __init vhci_init(void) |
1da177e4 | 350 | { |
4aa769b9 | 351 | BT_INFO("Virtual HCI driver ver %s", VERSION); |
1da177e4 | 352 | |
4aa769b9 MH |
353 | vhci_miscdev.minor = minor; |
354 | ||
355 | if (misc_register(&vhci_miscdev) < 0) { | |
356 | BT_ERR("Can't register misc device with minor %d", minor); | |
1da177e4 LT |
357 | return -EIO; |
358 | } | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
4aa769b9 | 363 | static void __exit vhci_exit(void) |
1da177e4 | 364 | { |
4aa769b9 MH |
365 | if (misc_deregister(&vhci_miscdev) < 0) |
366 | BT_ERR("Can't unregister misc device with minor %d", minor); | |
1da177e4 LT |
367 | } |
368 | ||
4aa769b9 MH |
369 | module_init(vhci_init); |
370 | module_exit(vhci_exit); | |
371 | ||
372 | module_param(minor, int, 0444); | |
373 | MODULE_PARM_DESC(minor, "Miscellaneous minor device number"); | |
1da177e4 | 374 | |
63fbd24e | 375 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
4aa769b9 MH |
376 | MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); |
377 | MODULE_VERSION(VERSION); | |
378 | MODULE_LICENSE("GPL"); |