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> |
4aa769b9 MH |
31 | #include <linux/types.h> |
32 | #include <linux/errno.h> | |
33 | #include <linux/sched.h> | |
1da177e4 | 34 | #include <linux/poll.h> |
1da177e4 LT |
35 | |
36 | #include <linux/skbuff.h> | |
37 | #include <linux/miscdevice.h> | |
38 | ||
1da177e4 LT |
39 | #include <net/bluetooth/bluetooth.h> |
40 | #include <net/bluetooth/hci_core.h> | |
1da177e4 | 41 | |
4aa769b9 MH |
42 | #ifndef CONFIG_BT_HCIVHCI_DEBUG |
43 | #undef BT_DBG | |
44 | #define BT_DBG(D...) | |
45 | #endif | |
46 | ||
47 | #define VERSION "1.2" | |
48 | ||
49 | static int minor = MISC_DYNAMIC_MINOR; | |
1da177e4 | 50 | |
4aa769b9 MH |
51 | struct 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 | ||
64 | static struct miscdevice vhci_miscdev; | |
65 | ||
66 | static int vhci_open_dev(struct hci_dev *hdev) | |
1da177e4 LT |
67 | { |
68 | set_bit(HCI_RUNNING, &hdev->flags); | |
1da177e4 | 69 | |
1da177e4 LT |
70 | return 0; |
71 | } | |
72 | ||
4aa769b9 | 73 | static int vhci_close_dev(struct hci_dev *hdev) |
1da177e4 | 74 | { |
9c724357 | 75 | struct vhci_data *data = hdev->driver_data; |
4aa769b9 | 76 | |
1da177e4 LT |
77 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) |
78 | return 0; | |
79 | ||
9c724357 | 80 | skb_queue_purge(&data->readq); |
4aa769b9 | 81 | |
1da177e4 LT |
82 | return 0; |
83 | } | |
84 | ||
4aa769b9 | 85 | static int vhci_flush(struct hci_dev *hdev) |
1da177e4 | 86 | { |
9c724357 | 87 | struct vhci_data *data = hdev->driver_data; |
1da177e4 | 88 | |
9c724357 | 89 | skb_queue_purge(&data->readq); |
1da177e4 | 90 | |
4aa769b9 | 91 | return 0; |
1da177e4 LT |
92 | } |
93 | ||
4aa769b9 | 94 | static int vhci_send_frame(struct sk_buff *skb) |
1da177e4 LT |
95 | { |
96 | struct hci_dev* hdev = (struct hci_dev *) skb->dev; | |
9c724357 | 97 | struct vhci_data *data; |
1da177e4 LT |
98 | |
99 | if (!hdev) { | |
4aa769b9 | 100 | BT_ERR("Frame for unknown HCI device (hdev=NULL)"); |
1da177e4 LT |
101 | return -ENODEV; |
102 | } | |
103 | ||
104 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
105 | return -EBUSY; | |
106 | ||
9c724357 | 107 | data = hdev->driver_data; |
1da177e4 | 108 | |
0d48d939 | 109 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); |
9c724357 | 110 | skb_queue_tail(&data->readq, skb); |
4aa769b9 | 111 | |
9c724357 MH |
112 | if (data->flags & VHCI_FASYNC) |
113 | kill_fasync(&data->fasync, SIGIO, POLL_IN); | |
1da177e4 | 114 | |
9c724357 | 115 | wake_up_interruptible(&data->read_wait); |
1da177e4 LT |
116 | |
117 | return 0; | |
118 | } | |
119 | ||
4aa769b9 MH |
120 | static void vhci_destruct(struct hci_dev *hdev) |
121 | { | |
122 | kfree(hdev->driver_data); | |
1da177e4 LT |
123 | } |
124 | ||
9c724357 | 125 | static inline ssize_t vhci_get_user(struct vhci_data *data, |
4aa769b9 | 126 | const char __user *buf, size_t count) |
1da177e4 LT |
127 | { |
128 | struct sk_buff *skb; | |
129 | ||
130 | if (count > HCI_MAX_FRAME_SIZE) | |
131 | return -EINVAL; | |
132 | ||
4aa769b9 MH |
133 | skb = bt_skb_alloc(count, GFP_KERNEL); |
134 | if (!skb) | |
1da177e4 | 135 | return -ENOMEM; |
4aa769b9 | 136 | |
1da177e4 LT |
137 | if (copy_from_user(skb_put(skb, count), buf, count)) { |
138 | kfree_skb(skb); | |
139 | return -EFAULT; | |
140 | } | |
141 | ||
9c724357 | 142 | skb->dev = (void *) data->hdev; |
0d48d939 | 143 | bt_cb(skb)->pkt_type = *((__u8 *) skb->data); |
1da177e4 LT |
144 | skb_pull(skb, 1); |
145 | ||
146 | hci_recv_frame(skb); | |
147 | ||
148 | return count; | |
1da177e4 LT |
149 | } |
150 | ||
9c724357 | 151 | static inline ssize_t vhci_put_user(struct vhci_data *data, |
4aa769b9 | 152 | struct sk_buff *skb, char __user *buf, int count) |
1da177e4 | 153 | { |
1da177e4 | 154 | char __user *ptr = buf; |
4aa769b9 MH |
155 | int len, total = 0; |
156 | ||
157 | len = min_t(unsigned int, skb->len, count); | |
1da177e4 | 158 | |
1da177e4 LT |
159 | if (copy_to_user(ptr, skb->data, len)) |
160 | return -EFAULT; | |
4aa769b9 | 161 | |
1da177e4 LT |
162 | total += len; |
163 | ||
9c724357 | 164 | data->hdev->stat.byte_tx += len; |
4aa769b9 | 165 | |
0d48d939 MH |
166 | switch (bt_cb(skb)->pkt_type) { |
167 | case HCI_COMMAND_PKT: | |
9c724357 | 168 | data->hdev->stat.cmd_tx++; |
0d48d939 | 169 | break; |
1da177e4 | 170 | |
0d48d939 | 171 | case HCI_ACLDATA_PKT: |
9c724357 | 172 | data->hdev->stat.acl_tx++; |
0d48d939 | 173 | break; |
1da177e4 | 174 | |
0d48d939 | 175 | case HCI_SCODATA_PKT: |
9c724357 | 176 | data->hdev->stat.cmd_tx++; |
0d48d939 | 177 | break; |
1da177e4 LT |
178 | }; |
179 | ||
180 | return total; | |
181 | } | |
182 | ||
9c724357 | 183 | static loff_t vhci_llseek(struct file *file, loff_t offset, int origin) |
4aa769b9 MH |
184 | { |
185 | return -ESPIPE; | |
186 | } | |
187 | ||
9c724357 MH |
188 | static ssize_t vhci_read(struct file *file, |
189 | char __user *buf, size_t count, loff_t *pos) | |
1da177e4 | 190 | { |
1da177e4 | 191 | DECLARE_WAITQUEUE(wait, current); |
9c724357 | 192 | struct vhci_data *data = file->private_data; |
1da177e4 LT |
193 | struct sk_buff *skb; |
194 | ssize_t ret = 0; | |
195 | ||
9c724357 | 196 | add_wait_queue(&data->read_wait, &wait); |
1da177e4 LT |
197 | while (count) { |
198 | set_current_state(TASK_INTERRUPTIBLE); | |
199 | ||
9c724357 | 200 | skb = skb_dequeue(&data->readq); |
4aa769b9 | 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)) | |
9c724357 | 217 | ret = vhci_put_user(data, skb, buf, count); |
1da177e4 LT |
218 | else |
219 | ret = -EFAULT; | |
220 | ||
221 | kfree_skb(skb); | |
222 | break; | |
223 | } | |
224 | set_current_state(TASK_RUNNING); | |
9c724357 | 225 | remove_wait_queue(&data->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 | { |
9c724357 | 233 | struct vhci_data *data = file->private_data; |
1da177e4 | 234 | |
4aa769b9 MH |
235 | if (!access_ok(VERIFY_READ, buf, count)) |
236 | return -EFAULT; | |
237 | ||
9c724357 | 238 | return vhci_get_user(data, buf, count); |
1da177e4 LT |
239 | } |
240 | ||
4aa769b9 | 241 | static unsigned int vhci_poll(struct file *file, poll_table *wait) |
1da177e4 | 242 | { |
9c724357 | 243 | struct vhci_data *data = file->private_data; |
1da177e4 | 244 | |
9c724357 | 245 | poll_wait(file, &data->read_wait, wait); |
1da177e4 | 246 | |
9c724357 | 247 | if (!skb_queue_empty(&data->readq)) |
4aa769b9 MH |
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 | { |
9c724357 | 261 | struct vhci_data *data; |
1da177e4 LT |
262 | struct hci_dev *hdev; |
263 | ||
9c724357 MH |
264 | data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL); |
265 | if (!data) | |
1da177e4 LT |
266 | return -ENOMEM; |
267 | ||
9c724357 MH |
268 | skb_queue_head_init(&data->readq); |
269 | init_waitqueue_head(&data->read_wait); | |
1da177e4 | 270 | |
1da177e4 LT |
271 | hdev = hci_alloc_dev(); |
272 | if (!hdev) { | |
9c724357 | 273 | kfree(data); |
1da177e4 LT |
274 | return -ENOMEM; |
275 | } | |
276 | ||
9c724357 | 277 | data->hdev = hdev; |
1da177e4 | 278 | |
0ac53939 | 279 | hdev->type = HCI_VIRTUAL; |
9c724357 | 280 | hdev->driver_data = data; |
1da177e4 | 281 | |
4aa769b9 MH |
282 | 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; | |
1da177e4 LT |
287 | |
288 | hdev->owner = THIS_MODULE; | |
4aa769b9 | 289 | |
1da177e4 | 290 | if (hci_register_dev(hdev) < 0) { |
4aa769b9 | 291 | BT_ERR("Can't register HCI device"); |
9c724357 | 292 | kfree(data); |
1da177e4 LT |
293 | hci_free_dev(hdev); |
294 | return -EBUSY; | |
295 | } | |
296 | ||
9c724357 | 297 | file->private_data = data; |
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; |
4aa769b9 MH |
321 | int err; |
322 | ||
9c724357 | 323 | err = fasync_helper(fd, file, on, &data->fasync); |
4aa769b9 MH |
324 | if (err < 0) |
325 | return err; | |
326 | ||
327 | if (on) | |
9c724357 | 328 | data->flags |= VHCI_FASYNC; |
4aa769b9 | 329 | else |
9c724357 | 330 | data->flags &= ~VHCI_FASYNC; |
4aa769b9 | 331 | |
1da177e4 LT |
332 | return 0; |
333 | } | |
334 | ||
2b8693c0 | 335 | static const struct file_operations vhci_fops = { |
4aa769b9 MH |
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, | |
1da177e4 LT |
345 | }; |
346 | ||
4aa769b9 MH |
347 | static struct miscdevice vhci_miscdev= { |
348 | .name = "vhci", | |
349 | .fops = &vhci_fops, | |
1da177e4 LT |
350 | }; |
351 | ||
4aa769b9 | 352 | static int __init vhci_init(void) |
1da177e4 | 353 | { |
4aa769b9 | 354 | BT_INFO("Virtual HCI driver ver %s", VERSION); |
1da177e4 | 355 | |
4aa769b9 MH |
356 | vhci_miscdev.minor = minor; |
357 | ||
358 | if (misc_register(&vhci_miscdev) < 0) { | |
359 | BT_ERR("Can't register misc device with minor %d", minor); | |
1da177e4 LT |
360 | return -EIO; |
361 | } | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
4aa769b9 | 366 | static void __exit vhci_exit(void) |
1da177e4 | 367 | { |
4aa769b9 MH |
368 | if (misc_deregister(&vhci_miscdev) < 0) |
369 | BT_ERR("Can't unregister misc device with minor %d", minor); | |
1da177e4 LT |
370 | } |
371 | ||
4aa769b9 MH |
372 | module_init(vhci_init); |
373 | module_exit(vhci_exit); | |
374 | ||
375 | module_param(minor, int, 0444); | |
376 | MODULE_PARM_DESC(minor, "Miscellaneous minor device number"); | |
1da177e4 | 377 | |
4aa769b9 MH |
378 | MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>"); |
379 | MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); | |
380 | MODULE_VERSION(VERSION); | |
381 | MODULE_LICENSE("GPL"); |