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 | 26 | #include <linux/module.h> |
23424c0d | 27 | #include <asm/unaligned.h> |
1da177e4 | 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 | |
23424c0d | 43 | #define VERSION "1.4" |
4aa769b9 | 44 | |
36acbb1a AE |
45 | static bool amp; |
46 | ||
4aa769b9 MH |
47 | struct vhci_data { |
48 | struct hci_dev *hdev; | |
49 | ||
4aa769b9 MH |
50 | wait_queue_head_t read_wait; |
51 | struct sk_buff_head readq; | |
23424c0d MH |
52 | |
53 | struct delayed_work open_timeout; | |
4aa769b9 MH |
54 | }; |
55 | ||
4aa769b9 | 56 | static int vhci_open_dev(struct hci_dev *hdev) |
1da177e4 LT |
57 | { |
58 | set_bit(HCI_RUNNING, &hdev->flags); | |
1da177e4 | 59 | |
1da177e4 LT |
60 | return 0; |
61 | } | |
62 | ||
4aa769b9 | 63 | static int vhci_close_dev(struct hci_dev *hdev) |
1da177e4 | 64 | { |
155961e8 | 65 | struct vhci_data *data = hci_get_drvdata(hdev); |
4aa769b9 | 66 | |
1da177e4 LT |
67 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) |
68 | return 0; | |
69 | ||
9c724357 | 70 | skb_queue_purge(&data->readq); |
4aa769b9 | 71 | |
1da177e4 LT |
72 | return 0; |
73 | } | |
74 | ||
4aa769b9 | 75 | static int vhci_flush(struct hci_dev *hdev) |
1da177e4 | 76 | { |
155961e8 | 77 | struct vhci_data *data = hci_get_drvdata(hdev); |
1da177e4 | 78 | |
9c724357 | 79 | skb_queue_purge(&data->readq); |
1da177e4 | 80 | |
4aa769b9 | 81 | return 0; |
1da177e4 LT |
82 | } |
83 | ||
7bd8f09f | 84 | static int vhci_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
1da177e4 | 85 | { |
60298775 | 86 | struct vhci_data *data = hci_get_drvdata(hdev); |
1da177e4 LT |
87 | |
88 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
89 | return -EBUSY; | |
90 | ||
0d48d939 | 91 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); |
9c724357 | 92 | skb_queue_tail(&data->readq, skb); |
4aa769b9 | 93 | |
9c724357 | 94 | wake_up_interruptible(&data->read_wait); |
23424c0d MH |
95 | return 0; |
96 | } | |
97 | ||
98 | static int vhci_create_device(struct vhci_data *data, __u8 dev_type) | |
99 | { | |
100 | struct hci_dev *hdev; | |
101 | struct sk_buff *skb; | |
102 | ||
103 | skb = bt_skb_alloc(4, GFP_KERNEL); | |
104 | if (!skb) | |
105 | return -ENOMEM; | |
106 | ||
107 | hdev = hci_alloc_dev(); | |
108 | if (!hdev) { | |
109 | kfree_skb(skb); | |
110 | return -ENOMEM; | |
111 | } | |
112 | ||
113 | data->hdev = hdev; | |
114 | ||
115 | hdev->bus = HCI_VIRTUAL; | |
116 | hdev->dev_type = dev_type; | |
117 | hci_set_drvdata(hdev, data); | |
118 | ||
119 | hdev->open = vhci_open_dev; | |
120 | hdev->close = vhci_close_dev; | |
121 | hdev->flush = vhci_flush; | |
122 | hdev->send = vhci_send_frame; | |
1da177e4 | 123 | |
23424c0d MH |
124 | if (hci_register_dev(hdev) < 0) { |
125 | BT_ERR("Can't register HCI device"); | |
126 | hci_free_dev(hdev); | |
127 | data->hdev = NULL; | |
128 | kfree_skb(skb); | |
129 | return -EBUSY; | |
130 | } | |
131 | ||
132 | bt_cb(skb)->pkt_type = HCI_VENDOR_PKT; | |
133 | ||
134 | *skb_put(skb, 1) = 0xff; | |
135 | *skb_put(skb, 1) = dev_type; | |
136 | put_unaligned_le16(hdev->id, skb_put(skb, 2)); | |
137 | skb_queue_tail(&data->readq, skb); | |
138 | ||
139 | wake_up_interruptible(&data->read_wait); | |
1da177e4 LT |
140 | return 0; |
141 | } | |
142 | ||
9c724357 | 143 | static inline ssize_t vhci_get_user(struct vhci_data *data, |
23424c0d | 144 | const char __user *buf, size_t count) |
1da177e4 LT |
145 | { |
146 | struct sk_buff *skb; | |
23424c0d MH |
147 | __u8 pkt_type, dev_type; |
148 | int ret; | |
1da177e4 | 149 | |
23424c0d | 150 | if (count < 2 || count > HCI_MAX_FRAME_SIZE) |
1da177e4 LT |
151 | return -EINVAL; |
152 | ||
4aa769b9 MH |
153 | skb = bt_skb_alloc(count, GFP_KERNEL); |
154 | if (!skb) | |
1da177e4 | 155 | return -ENOMEM; |
4aa769b9 | 156 | |
1da177e4 LT |
157 | if (copy_from_user(skb_put(skb, count), buf, count)) { |
158 | kfree_skb(skb); | |
159 | return -EFAULT; | |
160 | } | |
161 | ||
23424c0d | 162 | pkt_type = *((__u8 *) skb->data); |
1da177e4 LT |
163 | skb_pull(skb, 1); |
164 | ||
23424c0d MH |
165 | switch (pkt_type) { |
166 | case HCI_EVENT_PKT: | |
167 | case HCI_ACLDATA_PKT: | |
168 | case HCI_SCODATA_PKT: | |
169 | if (!data->hdev) { | |
170 | kfree_skb(skb); | |
171 | return -ENODEV; | |
172 | } | |
173 | ||
23424c0d MH |
174 | bt_cb(skb)->pkt_type = pkt_type; |
175 | ||
e1a26170 | 176 | ret = hci_recv_frame(data->hdev, skb); |
23424c0d MH |
177 | break; |
178 | ||
179 | case HCI_VENDOR_PKT: | |
180 | if (data->hdev) { | |
181 | kfree_skb(skb); | |
182 | return -EBADFD; | |
183 | } | |
1da177e4 | 184 | |
23424c0d MH |
185 | cancel_delayed_work_sync(&data->open_timeout); |
186 | ||
187 | dev_type = *((__u8 *) skb->data); | |
188 | skb_pull(skb, 1); | |
189 | ||
190 | if (skb->len > 0) { | |
191 | kfree_skb(skb); | |
192 | return -EINVAL; | |
193 | } | |
194 | ||
195 | kfree_skb(skb); | |
196 | ||
197 | if (dev_type != HCI_BREDR && dev_type != HCI_AMP) | |
198 | return -EINVAL; | |
199 | ||
200 | ret = vhci_create_device(data, dev_type); | |
201 | break; | |
202 | ||
203 | default: | |
204 | kfree_skb(skb); | |
205 | return -EINVAL; | |
206 | } | |
207 | ||
208 | return (ret < 0) ? ret : count; | |
1da177e4 LT |
209 | } |
210 | ||
9c724357 | 211 | static inline ssize_t vhci_put_user(struct vhci_data *data, |
23424c0d MH |
212 | struct sk_buff *skb, |
213 | char __user *buf, int count) | |
1da177e4 | 214 | { |
1da177e4 | 215 | char __user *ptr = buf; |
23424c0d | 216 | int len; |
4aa769b9 MH |
217 | |
218 | len = min_t(unsigned int, skb->len, count); | |
1da177e4 | 219 | |
1da177e4 LT |
220 | if (copy_to_user(ptr, skb->data, len)) |
221 | return -EFAULT; | |
4aa769b9 | 222 | |
23424c0d MH |
223 | if (!data->hdev) |
224 | return len; | |
1da177e4 | 225 | |
9c724357 | 226 | data->hdev->stat.byte_tx += len; |
4aa769b9 | 227 | |
0d48d939 MH |
228 | switch (bt_cb(skb)->pkt_type) { |
229 | case HCI_COMMAND_PKT: | |
9c724357 | 230 | data->hdev->stat.cmd_tx++; |
0d48d939 | 231 | break; |
0d48d939 | 232 | case HCI_ACLDATA_PKT: |
9c724357 | 233 | data->hdev->stat.acl_tx++; |
0d48d939 | 234 | break; |
0d48d939 | 235 | case HCI_SCODATA_PKT: |
4f7ac181 | 236 | data->hdev->stat.sco_tx++; |
0d48d939 | 237 | break; |
2c24d454 | 238 | } |
1da177e4 | 239 | |
23424c0d | 240 | return len; |
1da177e4 LT |
241 | } |
242 | ||
9c724357 | 243 | static ssize_t vhci_read(struct file *file, |
23424c0d | 244 | char __user *buf, size_t count, loff_t *pos) |
1da177e4 | 245 | { |
9c724357 | 246 | struct vhci_data *data = file->private_data; |
1da177e4 LT |
247 | struct sk_buff *skb; |
248 | ssize_t ret = 0; | |
249 | ||
1da177e4 | 250 | while (count) { |
9c724357 | 251 | skb = skb_dequeue(&data->readq); |
4db7589f MH |
252 | if (skb) { |
253 | ret = vhci_put_user(data, skb, buf, count); | |
254 | if (ret < 0) | |
255 | skb_queue_head(&data->readq, skb); | |
256 | else | |
257 | kfree_skb(skb); | |
258 | break; | |
1da177e4 LT |
259 | } |
260 | ||
4db7589f MH |
261 | if (file->f_flags & O_NONBLOCK) { |
262 | ret = -EAGAIN; | |
263 | break; | |
264 | } | |
1da177e4 | 265 | |
4db7589f | 266 | ret = wait_event_interruptible(data->read_wait, |
23424c0d | 267 | !skb_queue_empty(&data->readq)); |
4db7589f MH |
268 | if (ret < 0) |
269 | break; | |
1da177e4 | 270 | } |
1da177e4 LT |
271 | |
272 | return ret; | |
273 | } | |
274 | ||
4aa769b9 | 275 | static ssize_t vhci_write(struct file *file, |
23424c0d | 276 | const char __user *buf, size_t count, loff_t *pos) |
1da177e4 | 277 | { |
9c724357 | 278 | struct vhci_data *data = file->private_data; |
1da177e4 | 279 | |
9c724357 | 280 | return vhci_get_user(data, buf, count); |
1da177e4 LT |
281 | } |
282 | ||
4aa769b9 | 283 | static unsigned int vhci_poll(struct file *file, poll_table *wait) |
1da177e4 | 284 | { |
9c724357 | 285 | struct vhci_data *data = file->private_data; |
1da177e4 | 286 | |
9c724357 | 287 | poll_wait(file, &data->read_wait, wait); |
1da177e4 | 288 | |
9c724357 | 289 | if (!skb_queue_empty(&data->readq)) |
4aa769b9 MH |
290 | return POLLIN | POLLRDNORM; |
291 | ||
292 | return POLLOUT | POLLWRNORM; | |
293 | } | |
294 | ||
23424c0d MH |
295 | static void vhci_open_timeout(struct work_struct *work) |
296 | { | |
297 | struct vhci_data *data = container_of(work, struct vhci_data, | |
298 | open_timeout.work); | |
299 | ||
300 | vhci_create_device(data, amp ? HCI_AMP : HCI_BREDR); | |
301 | } | |
302 | ||
4aa769b9 | 303 | static int vhci_open(struct inode *inode, struct file *file) |
1da177e4 | 304 | { |
9c724357 | 305 | struct vhci_data *data; |
1da177e4 | 306 | |
9c724357 MH |
307 | data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL); |
308 | if (!data) | |
1da177e4 LT |
309 | return -ENOMEM; |
310 | ||
9c724357 MH |
311 | skb_queue_head_init(&data->readq); |
312 | init_waitqueue_head(&data->read_wait); | |
1da177e4 | 313 | |
23424c0d | 314 | INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout); |
1da177e4 | 315 | |
9c724357 | 316 | file->private_data = data; |
0dea0141 | 317 | nonseekable_open(inode, file); |
4aa769b9 | 318 | |
23424c0d MH |
319 | schedule_delayed_work(&data->open_timeout, msecs_to_jiffies(1000)); |
320 | ||
0dea0141 | 321 | return 0; |
1da177e4 LT |
322 | } |
323 | ||
4aa769b9 | 324 | static int vhci_release(struct inode *inode, struct file *file) |
1da177e4 | 325 | { |
9c724357 MH |
326 | struct vhci_data *data = file->private_data; |
327 | struct hci_dev *hdev = data->hdev; | |
1da177e4 | 328 | |
23424c0d MH |
329 | cancel_delayed_work_sync(&data->open_timeout); |
330 | ||
331 | if (hdev) { | |
332 | hci_unregister_dev(hdev); | |
333 | hci_free_dev(hdev); | |
334 | } | |
1da177e4 LT |
335 | |
336 | file->private_data = NULL; | |
bf18c711 | 337 | kfree(data); |
4aa769b9 MH |
338 | |
339 | return 0; | |
340 | } | |
341 | ||
2b8693c0 | 342 | static const struct file_operations vhci_fops = { |
fed4c250 | 343 | .owner = THIS_MODULE, |
4aa769b9 MH |
344 | .read = vhci_read, |
345 | .write = vhci_write, | |
346 | .poll = vhci_poll, | |
4aa769b9 MH |
347 | .open = vhci_open, |
348 | .release = vhci_release, | |
6038f373 | 349 | .llseek = no_llseek, |
1da177e4 LT |
350 | }; |
351 | ||
4aa769b9 | 352 | static struct miscdevice vhci_miscdev= { |
ac28494c MH |
353 | .name = "vhci", |
354 | .fops = &vhci_fops, | |
355 | .minor = MISC_DYNAMIC_MINOR, | |
1da177e4 LT |
356 | }; |
357 | ||
4aa769b9 | 358 | static int __init vhci_init(void) |
1da177e4 | 359 | { |
4aa769b9 | 360 | BT_INFO("Virtual HCI driver ver %s", VERSION); |
1da177e4 | 361 | |
329ab1b3 | 362 | return misc_register(&vhci_miscdev); |
1da177e4 LT |
363 | } |
364 | ||
4aa769b9 | 365 | static void __exit vhci_exit(void) |
1da177e4 | 366 | { |
329ab1b3 | 367 | misc_deregister(&vhci_miscdev); |
1da177e4 LT |
368 | } |
369 | ||
4aa769b9 MH |
370 | module_init(vhci_init); |
371 | module_exit(vhci_exit); | |
372 | ||
36acbb1a AE |
373 | module_param(amp, bool, 0644); |
374 | MODULE_PARM_DESC(amp, "Create AMP controller device"); | |
375 | ||
63fbd24e | 376 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
4aa769b9 MH |
377 | MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); |
378 | MODULE_VERSION(VERSION); | |
379 | MODULE_LICENSE("GPL"); | |
bfacbb9a | 380 | MODULE_ALIAS("devname:vhci"); |