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 | #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 | { |
9c724357 | 76 | struct vhci_data *data = hdev->driver_data; |
4aa769b9 | 77 | |
1da177e4 LT |
78 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) |
79 | return 0; | |
80 | ||
9c724357 | 81 | skb_queue_purge(&data->readq); |
4aa769b9 | 82 | |
1da177e4 LT |
83 | return 0; |
84 | } | |
85 | ||
4aa769b9 | 86 | static int vhci_flush(struct hci_dev *hdev) |
1da177e4 | 87 | { |
9c724357 | 88 | struct vhci_data *data = hdev->driver_data; |
1da177e4 | 89 | |
9c724357 | 90 | skb_queue_purge(&data->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; | |
9c724357 | 98 | struct vhci_data *data; |
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 | ||
9c724357 | 108 | data = hdev->driver_data; |
1da177e4 | 109 | |
0d48d939 | 110 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); |
9c724357 | 111 | skb_queue_tail(&data->readq, skb); |
4aa769b9 | 112 | |
9c724357 MH |
113 | if (data->flags & VHCI_FASYNC) |
114 | kill_fasync(&data->fasync, SIGIO, POLL_IN); | |
1da177e4 | 115 | |
9c724357 | 116 | wake_up_interruptible(&data->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 | ||
9c724357 | 126 | static inline ssize_t vhci_get_user(struct vhci_data *data, |
4aa769b9 | 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 | ||
9c724357 | 143 | skb->dev = (void *) data->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 | ||
9c724357 | 152 | static inline ssize_t vhci_put_user(struct vhci_data *data, |
4aa769b9 | 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 | ||
9c724357 | 165 | data->hdev->stat.byte_tx += len; |
4aa769b9 | 166 | |
0d48d939 MH |
167 | switch (bt_cb(skb)->pkt_type) { |
168 | case HCI_COMMAND_PKT: | |
9c724357 | 169 | data->hdev->stat.cmd_tx++; |
0d48d939 | 170 | break; |
1da177e4 | 171 | |
0d48d939 | 172 | case HCI_ACLDATA_PKT: |
9c724357 | 173 | data->hdev->stat.acl_tx++; |
0d48d939 | 174 | break; |
1da177e4 | 175 | |
0d48d939 | 176 | case HCI_SCODATA_PKT: |
9c724357 | 177 | data->hdev->stat.cmd_tx++; |
0d48d939 | 178 | break; |
1da177e4 LT |
179 | }; |
180 | ||
181 | return total; | |
182 | } | |
183 | ||
9c724357 MH |
184 | static ssize_t vhci_read(struct file *file, |
185 | char __user *buf, size_t count, loff_t *pos) | |
1da177e4 | 186 | { |
1da177e4 | 187 | DECLARE_WAITQUEUE(wait, current); |
9c724357 | 188 | struct vhci_data *data = file->private_data; |
1da177e4 LT |
189 | struct sk_buff *skb; |
190 | ssize_t ret = 0; | |
191 | ||
9c724357 | 192 | add_wait_queue(&data->read_wait, &wait); |
1da177e4 LT |
193 | while (count) { |
194 | set_current_state(TASK_INTERRUPTIBLE); | |
195 | ||
9c724357 | 196 | skb = skb_dequeue(&data->readq); |
4aa769b9 | 197 | if (!skb) { |
1da177e4 LT |
198 | if (file->f_flags & O_NONBLOCK) { |
199 | ret = -EAGAIN; | |
200 | break; | |
201 | } | |
4aa769b9 | 202 | |
1da177e4 LT |
203 | if (signal_pending(current)) { |
204 | ret = -ERESTARTSYS; | |
205 | break; | |
206 | } | |
207 | ||
1da177e4 LT |
208 | schedule(); |
209 | continue; | |
210 | } | |
211 | ||
212 | if (access_ok(VERIFY_WRITE, buf, count)) | |
9c724357 | 213 | ret = vhci_put_user(data, skb, buf, count); |
1da177e4 LT |
214 | else |
215 | ret = -EFAULT; | |
216 | ||
217 | kfree_skb(skb); | |
218 | break; | |
219 | } | |
220 | set_current_state(TASK_RUNNING); | |
9c724357 | 221 | remove_wait_queue(&data->read_wait, &wait); |
1da177e4 LT |
222 | |
223 | return ret; | |
224 | } | |
225 | ||
4aa769b9 MH |
226 | static ssize_t vhci_write(struct file *file, |
227 | const char __user *buf, size_t count, loff_t *pos) | |
1da177e4 | 228 | { |
9c724357 | 229 | struct vhci_data *data = file->private_data; |
1da177e4 | 230 | |
4aa769b9 MH |
231 | if (!access_ok(VERIFY_READ, buf, count)) |
232 | return -EFAULT; | |
233 | ||
9c724357 | 234 | return vhci_get_user(data, buf, count); |
1da177e4 LT |
235 | } |
236 | ||
4aa769b9 | 237 | static unsigned int vhci_poll(struct file *file, poll_table *wait) |
1da177e4 | 238 | { |
9c724357 | 239 | struct vhci_data *data = file->private_data; |
1da177e4 | 240 | |
9c724357 | 241 | poll_wait(file, &data->read_wait, wait); |
1da177e4 | 242 | |
9c724357 | 243 | if (!skb_queue_empty(&data->readq)) |
4aa769b9 MH |
244 | return POLLIN | POLLRDNORM; |
245 | ||
246 | return POLLOUT | POLLWRNORM; | |
247 | } | |
248 | ||
249 | static int vhci_ioctl(struct inode *inode, struct file *file, | |
250 | unsigned int cmd, unsigned long arg) | |
251 | { | |
252 | return -EINVAL; | |
1da177e4 LT |
253 | } |
254 | ||
4aa769b9 | 255 | static int vhci_open(struct inode *inode, struct file *file) |
1da177e4 | 256 | { |
9c724357 | 257 | struct vhci_data *data; |
1da177e4 LT |
258 | struct hci_dev *hdev; |
259 | ||
9c724357 MH |
260 | data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL); |
261 | if (!data) | |
1da177e4 LT |
262 | return -ENOMEM; |
263 | ||
9c724357 MH |
264 | skb_queue_head_init(&data->readq); |
265 | init_waitqueue_head(&data->read_wait); | |
1da177e4 | 266 | |
8324af6d | 267 | lock_kernel(); |
1da177e4 LT |
268 | hdev = hci_alloc_dev(); |
269 | if (!hdev) { | |
9c724357 | 270 | kfree(data); |
8324af6d | 271 | unlock_kernel(); |
1da177e4 LT |
272 | return -ENOMEM; |
273 | } | |
274 | ||
9c724357 | 275 | data->hdev = hdev; |
1da177e4 | 276 | |
0ac53939 | 277 | hdev->type = HCI_VIRTUAL; |
9c724357 | 278 | hdev->driver_data = data; |
1da177e4 | 279 | |
4aa769b9 MH |
280 | hdev->open = vhci_open_dev; |
281 | hdev->close = vhci_close_dev; | |
282 | hdev->flush = vhci_flush; | |
283 | hdev->send = vhci_send_frame; | |
284 | hdev->destruct = vhci_destruct; | |
1da177e4 LT |
285 | |
286 | hdev->owner = THIS_MODULE; | |
4aa769b9 | 287 | |
1da177e4 | 288 | if (hci_register_dev(hdev) < 0) { |
4aa769b9 | 289 | BT_ERR("Can't register HCI device"); |
9c724357 | 290 | kfree(data); |
1da177e4 | 291 | hci_free_dev(hdev); |
8324af6d | 292 | unlock_kernel(); |
1da177e4 LT |
293 | return -EBUSY; |
294 | } | |
295 | ||
9c724357 | 296 | file->private_data = data; |
8324af6d | 297 | unlock_kernel(); |
4aa769b9 MH |
298 | |
299 | return nonseekable_open(inode, file); | |
1da177e4 LT |
300 | } |
301 | ||
4aa769b9 | 302 | static int vhci_release(struct inode *inode, struct file *file) |
1da177e4 | 303 | { |
9c724357 MH |
304 | struct vhci_data *data = file->private_data; |
305 | struct hci_dev *hdev = data->hdev; | |
1da177e4 LT |
306 | |
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; | |
4aa769b9 MH |
314 | |
315 | return 0; | |
316 | } | |
317 | ||
318 | static int vhci_fasync(int fd, struct file *file, int on) | |
319 | { | |
9c724357 | 320 | struct vhci_data *data = file->private_data; |
dbfb2df7 | 321 | int err = 0; |
4aa769b9 | 322 | |
dbfb2df7 | 323 | lock_kernel(); |
9c724357 | 324 | err = fasync_helper(fd, file, on, &data->fasync); |
4aa769b9 | 325 | if (err < 0) |
dbfb2df7 | 326 | goto out; |
4aa769b9 MH |
327 | |
328 | if (on) | |
9c724357 | 329 | data->flags |= VHCI_FASYNC; |
4aa769b9 | 330 | else |
9c724357 | 331 | data->flags &= ~VHCI_FASYNC; |
4aa769b9 | 332 | |
dbfb2df7 JC |
333 | out: |
334 | unlock_kernel(); | |
335 | return err; | |
1da177e4 LT |
336 | } |
337 | ||
2b8693c0 | 338 | static const struct file_operations vhci_fops = { |
4aa769b9 | 339 | .owner = THIS_MODULE, |
4aa769b9 MH |
340 | .read = vhci_read, |
341 | .write = vhci_write, | |
342 | .poll = vhci_poll, | |
343 | .ioctl = vhci_ioctl, | |
344 | .open = vhci_open, | |
345 | .release = vhci_release, | |
346 | .fasync = vhci_fasync, | |
1da177e4 LT |
347 | }; |
348 | ||
4aa769b9 MH |
349 | static struct miscdevice vhci_miscdev= { |
350 | .name = "vhci", | |
351 | .fops = &vhci_fops, | |
1da177e4 LT |
352 | }; |
353 | ||
4aa769b9 | 354 | static int __init vhci_init(void) |
1da177e4 | 355 | { |
4aa769b9 | 356 | BT_INFO("Virtual HCI driver ver %s", VERSION); |
1da177e4 | 357 | |
4aa769b9 MH |
358 | vhci_miscdev.minor = minor; |
359 | ||
360 | if (misc_register(&vhci_miscdev) < 0) { | |
361 | BT_ERR("Can't register misc device with minor %d", minor); | |
1da177e4 LT |
362 | return -EIO; |
363 | } | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
4aa769b9 | 368 | static void __exit vhci_exit(void) |
1da177e4 | 369 | { |
4aa769b9 MH |
370 | if (misc_deregister(&vhci_miscdev) < 0) |
371 | BT_ERR("Can't unregister misc device with minor %d", minor); | |
1da177e4 LT |
372 | } |
373 | ||
4aa769b9 MH |
374 | module_init(vhci_init); |
375 | module_exit(vhci_exit); | |
376 | ||
377 | module_param(minor, int, 0444); | |
378 | MODULE_PARM_DESC(minor, "Miscellaneous minor device number"); | |
1da177e4 | 379 | |
63fbd24e | 380 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
4aa769b9 MH |
381 | MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); |
382 | MODULE_VERSION(VERSION); | |
383 | MODULE_LICENSE("GPL"); |