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 | |
82a30cfc | 43 | #define VERSION "1.5" |
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 | 52 | |
c7c999cb | 53 | struct mutex open_mutex; |
23424c0d | 54 | struct delayed_work open_timeout; |
4aa769b9 MH |
55 | }; |
56 | ||
4aa769b9 | 57 | static int vhci_open_dev(struct hci_dev *hdev) |
1da177e4 | 58 | { |
1da177e4 LT |
59 | return 0; |
60 | } | |
61 | ||
4aa769b9 | 62 | static int vhci_close_dev(struct hci_dev *hdev) |
1da177e4 | 63 | { |
155961e8 | 64 | struct vhci_data *data = hci_get_drvdata(hdev); |
4aa769b9 | 65 | |
9c724357 | 66 | skb_queue_purge(&data->readq); |
4aa769b9 | 67 | |
1da177e4 LT |
68 | return 0; |
69 | } | |
70 | ||
4aa769b9 | 71 | static int vhci_flush(struct hci_dev *hdev) |
1da177e4 | 72 | { |
155961e8 | 73 | struct vhci_data *data = hci_get_drvdata(hdev); |
1da177e4 | 74 | |
9c724357 | 75 | skb_queue_purge(&data->readq); |
1da177e4 | 76 | |
4aa769b9 | 77 | return 0; |
1da177e4 LT |
78 | } |
79 | ||
7bd8f09f | 80 | static int vhci_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
1da177e4 | 81 | { |
60298775 | 82 | struct vhci_data *data = hci_get_drvdata(hdev); |
1da177e4 | 83 | |
618e8bc2 | 84 | memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); |
9c724357 | 85 | skb_queue_tail(&data->readq, skb); |
4aa769b9 | 86 | |
9c724357 | 87 | wake_up_interruptible(&data->read_wait); |
23424c0d MH |
88 | return 0; |
89 | } | |
90 | ||
c7c999cb | 91 | static int __vhci_create_device(struct vhci_data *data, __u8 opcode) |
23424c0d MH |
92 | { |
93 | struct hci_dev *hdev; | |
94 | struct sk_buff *skb; | |
82a30cfc MH |
95 | __u8 dev_type; |
96 | ||
c7c999cb TI |
97 | if (data->hdev) |
98 | return -EBADFD; | |
99 | ||
82a30cfc MH |
100 | /* bits 0-1 are dev_type (BR/EDR or AMP) */ |
101 | dev_type = opcode & 0x03; | |
102 | ||
103 | if (dev_type != HCI_BREDR && dev_type != HCI_AMP) | |
104 | return -EINVAL; | |
105 | ||
0ad184ef MH |
106 | /* bits 2-5 are reserved (must be zero) */ |
107 | if (opcode & 0x3c) | |
82a30cfc | 108 | return -EINVAL; |
23424c0d MH |
109 | |
110 | skb = bt_skb_alloc(4, GFP_KERNEL); | |
111 | if (!skb) | |
112 | return -ENOMEM; | |
113 | ||
114 | hdev = hci_alloc_dev(); | |
115 | if (!hdev) { | |
116 | kfree_skb(skb); | |
117 | return -ENOMEM; | |
118 | } | |
119 | ||
120 | data->hdev = hdev; | |
121 | ||
122 | hdev->bus = HCI_VIRTUAL; | |
123 | hdev->dev_type = dev_type; | |
124 | hci_set_drvdata(hdev, data); | |
125 | ||
126 | hdev->open = vhci_open_dev; | |
127 | hdev->close = vhci_close_dev; | |
128 | hdev->flush = vhci_flush; | |
129 | hdev->send = vhci_send_frame; | |
1da177e4 | 130 | |
0ad184ef MH |
131 | /* bit 6 is for external configuration */ |
132 | if (opcode & 0x40) | |
133 | set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks); | |
134 | ||
82a30cfc MH |
135 | /* bit 7 is for raw device */ |
136 | if (opcode & 0x80) | |
137 | set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks); | |
138 | ||
23424c0d MH |
139 | if (hci_register_dev(hdev) < 0) { |
140 | BT_ERR("Can't register HCI device"); | |
141 | hci_free_dev(hdev); | |
142 | data->hdev = NULL; | |
143 | kfree_skb(skb); | |
144 | return -EBUSY; | |
145 | } | |
146 | ||
618e8bc2 | 147 | hci_skb_pkt_type(skb) = HCI_VENDOR_PKT; |
23424c0d MH |
148 | |
149 | *skb_put(skb, 1) = 0xff; | |
82a30cfc | 150 | *skb_put(skb, 1) = opcode; |
23424c0d MH |
151 | put_unaligned_le16(hdev->id, skb_put(skb, 2)); |
152 | skb_queue_tail(&data->readq, skb); | |
153 | ||
154 | wake_up_interruptible(&data->read_wait); | |
1da177e4 LT |
155 | return 0; |
156 | } | |
157 | ||
c7c999cb TI |
158 | static int vhci_create_device(struct vhci_data *data, __u8 opcode) |
159 | { | |
160 | int err; | |
161 | ||
162 | mutex_lock(&data->open_mutex); | |
163 | err = __vhci_create_device(data, opcode); | |
164 | mutex_unlock(&data->open_mutex); | |
165 | ||
166 | return err; | |
167 | } | |
168 | ||
9c724357 | 169 | static inline ssize_t vhci_get_user(struct vhci_data *data, |
512b2268 | 170 | struct iov_iter *from) |
1da177e4 | 171 | { |
512b2268 | 172 | size_t len = iov_iter_count(from); |
1da177e4 | 173 | struct sk_buff *skb; |
82a30cfc | 174 | __u8 pkt_type, opcode; |
23424c0d | 175 | int ret; |
1da177e4 | 176 | |
5bc00b5c | 177 | if (len < 2 || len > HCI_MAX_FRAME_SIZE) |
1da177e4 LT |
178 | return -EINVAL; |
179 | ||
5bc00b5c | 180 | skb = bt_skb_alloc(len, GFP_KERNEL); |
4aa769b9 | 181 | if (!skb) |
1da177e4 | 182 | return -ENOMEM; |
4aa769b9 | 183 | |
512b2268 AV |
184 | if (copy_from_iter(skb_put(skb, len), len, from) != len) { |
185 | kfree_skb(skb); | |
186 | return -EFAULT; | |
1da177e4 LT |
187 | } |
188 | ||
23424c0d | 189 | pkt_type = *((__u8 *) skb->data); |
1da177e4 LT |
190 | skb_pull(skb, 1); |
191 | ||
23424c0d MH |
192 | switch (pkt_type) { |
193 | case HCI_EVENT_PKT: | |
194 | case HCI_ACLDATA_PKT: | |
195 | case HCI_SCODATA_PKT: | |
196 | if (!data->hdev) { | |
197 | kfree_skb(skb); | |
198 | return -ENODEV; | |
199 | } | |
200 | ||
618e8bc2 | 201 | hci_skb_pkt_type(skb) = pkt_type; |
23424c0d | 202 | |
e1a26170 | 203 | ret = hci_recv_frame(data->hdev, skb); |
23424c0d MH |
204 | break; |
205 | ||
206 | case HCI_VENDOR_PKT: | |
373a32c8 JS |
207 | cancel_delayed_work_sync(&data->open_timeout); |
208 | ||
82a30cfc | 209 | opcode = *((__u8 *) skb->data); |
23424c0d MH |
210 | skb_pull(skb, 1); |
211 | ||
212 | if (skb->len > 0) { | |
213 | kfree_skb(skb); | |
214 | return -EINVAL; | |
215 | } | |
216 | ||
217 | kfree_skb(skb); | |
218 | ||
82a30cfc | 219 | ret = vhci_create_device(data, opcode); |
23424c0d MH |
220 | break; |
221 | ||
222 | default: | |
223 | kfree_skb(skb); | |
224 | return -EINVAL; | |
225 | } | |
226 | ||
5bc00b5c | 227 | return (ret < 0) ? ret : len; |
1da177e4 LT |
228 | } |
229 | ||
9c724357 | 230 | static inline ssize_t vhci_put_user(struct vhci_data *data, |
23424c0d MH |
231 | struct sk_buff *skb, |
232 | char __user *buf, int count) | |
1da177e4 | 233 | { |
1da177e4 | 234 | char __user *ptr = buf; |
23424c0d | 235 | int len; |
4aa769b9 MH |
236 | |
237 | len = min_t(unsigned int, skb->len, count); | |
1da177e4 | 238 | |
1da177e4 LT |
239 | if (copy_to_user(ptr, skb->data, len)) |
240 | return -EFAULT; | |
4aa769b9 | 241 | |
23424c0d MH |
242 | if (!data->hdev) |
243 | return len; | |
1da177e4 | 244 | |
9c724357 | 245 | data->hdev->stat.byte_tx += len; |
4aa769b9 | 246 | |
618e8bc2 | 247 | switch (hci_skb_pkt_type(skb)) { |
0d48d939 | 248 | case HCI_COMMAND_PKT: |
9c724357 | 249 | data->hdev->stat.cmd_tx++; |
0d48d939 | 250 | break; |
0d48d939 | 251 | case HCI_ACLDATA_PKT: |
9c724357 | 252 | data->hdev->stat.acl_tx++; |
0d48d939 | 253 | break; |
0d48d939 | 254 | case HCI_SCODATA_PKT: |
4f7ac181 | 255 | data->hdev->stat.sco_tx++; |
0d48d939 | 256 | break; |
2c24d454 | 257 | } |
1da177e4 | 258 | |
23424c0d | 259 | return len; |
1da177e4 LT |
260 | } |
261 | ||
9c724357 | 262 | static ssize_t vhci_read(struct file *file, |
23424c0d | 263 | char __user *buf, size_t count, loff_t *pos) |
1da177e4 | 264 | { |
9c724357 | 265 | struct vhci_data *data = file->private_data; |
1da177e4 LT |
266 | struct sk_buff *skb; |
267 | ssize_t ret = 0; | |
268 | ||
1da177e4 | 269 | while (count) { |
9c724357 | 270 | skb = skb_dequeue(&data->readq); |
4db7589f MH |
271 | if (skb) { |
272 | ret = vhci_put_user(data, skb, buf, count); | |
273 | if (ret < 0) | |
274 | skb_queue_head(&data->readq, skb); | |
275 | else | |
276 | kfree_skb(skb); | |
277 | break; | |
1da177e4 LT |
278 | } |
279 | ||
4db7589f MH |
280 | if (file->f_flags & O_NONBLOCK) { |
281 | ret = -EAGAIN; | |
282 | break; | |
283 | } | |
1da177e4 | 284 | |
4db7589f | 285 | ret = wait_event_interruptible(data->read_wait, |
23424c0d | 286 | !skb_queue_empty(&data->readq)); |
4db7589f MH |
287 | if (ret < 0) |
288 | break; | |
1da177e4 | 289 | } |
1da177e4 LT |
290 | |
291 | return ret; | |
292 | } | |
293 | ||
512b2268 | 294 | static ssize_t vhci_write(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 | 295 | { |
5bc00b5c | 296 | struct file *file = iocb->ki_filp; |
9c724357 | 297 | struct vhci_data *data = file->private_data; |
1da177e4 | 298 | |
512b2268 | 299 | return vhci_get_user(data, from); |
1da177e4 LT |
300 | } |
301 | ||
4aa769b9 | 302 | static unsigned int vhci_poll(struct file *file, poll_table *wait) |
1da177e4 | 303 | { |
9c724357 | 304 | struct vhci_data *data = file->private_data; |
1da177e4 | 305 | |
9c724357 | 306 | poll_wait(file, &data->read_wait, wait); |
1da177e4 | 307 | |
9c724357 | 308 | if (!skb_queue_empty(&data->readq)) |
4aa769b9 MH |
309 | return POLLIN | POLLRDNORM; |
310 | ||
311 | return POLLOUT | POLLWRNORM; | |
312 | } | |
313 | ||
23424c0d MH |
314 | static void vhci_open_timeout(struct work_struct *work) |
315 | { | |
316 | struct vhci_data *data = container_of(work, struct vhci_data, | |
317 | open_timeout.work); | |
318 | ||
319 | vhci_create_device(data, amp ? HCI_AMP : HCI_BREDR); | |
320 | } | |
321 | ||
4aa769b9 | 322 | static int vhci_open(struct inode *inode, struct file *file) |
1da177e4 | 323 | { |
9c724357 | 324 | struct vhci_data *data; |
1da177e4 | 325 | |
9c724357 MH |
326 | data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL); |
327 | if (!data) | |
1da177e4 LT |
328 | return -ENOMEM; |
329 | ||
9c724357 MH |
330 | skb_queue_head_init(&data->readq); |
331 | init_waitqueue_head(&data->read_wait); | |
1da177e4 | 332 | |
c7c999cb | 333 | mutex_init(&data->open_mutex); |
23424c0d | 334 | INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout); |
1da177e4 | 335 | |
9c724357 | 336 | file->private_data = data; |
0dea0141 | 337 | nonseekable_open(inode, file); |
4aa769b9 | 338 | |
23424c0d MH |
339 | schedule_delayed_work(&data->open_timeout, msecs_to_jiffies(1000)); |
340 | ||
0dea0141 | 341 | return 0; |
1da177e4 LT |
342 | } |
343 | ||
4aa769b9 | 344 | static int vhci_release(struct inode *inode, struct file *file) |
1da177e4 | 345 | { |
9c724357 | 346 | struct vhci_data *data = file->private_data; |
373a32c8 | 347 | struct hci_dev *hdev; |
1da177e4 | 348 | |
23424c0d MH |
349 | cancel_delayed_work_sync(&data->open_timeout); |
350 | ||
373a32c8 JS |
351 | hdev = data->hdev; |
352 | ||
23424c0d MH |
353 | if (hdev) { |
354 | hci_unregister_dev(hdev); | |
355 | hci_free_dev(hdev); | |
356 | } | |
1da177e4 | 357 | |
13407376 | 358 | skb_queue_purge(&data->readq); |
1da177e4 | 359 | file->private_data = NULL; |
bf18c711 | 360 | kfree(data); |
4aa769b9 MH |
361 | |
362 | return 0; | |
363 | } | |
364 | ||
2b8693c0 | 365 | static const struct file_operations vhci_fops = { |
fed4c250 | 366 | .owner = THIS_MODULE, |
4aa769b9 | 367 | .read = vhci_read, |
512b2268 | 368 | .write_iter = vhci_write, |
4aa769b9 | 369 | .poll = vhci_poll, |
4aa769b9 MH |
370 | .open = vhci_open, |
371 | .release = vhci_release, | |
6038f373 | 372 | .llseek = no_llseek, |
1da177e4 LT |
373 | }; |
374 | ||
4eeab599 | 375 | static struct miscdevice vhci_miscdev = { |
ac28494c MH |
376 | .name = "vhci", |
377 | .fops = &vhci_fops, | |
b075dd40 | 378 | .minor = VHCI_MINOR, |
1da177e4 LT |
379 | }; |
380 | ||
4aa769b9 | 381 | static int __init vhci_init(void) |
1da177e4 | 382 | { |
4aa769b9 | 383 | BT_INFO("Virtual HCI driver ver %s", VERSION); |
1da177e4 | 384 | |
329ab1b3 | 385 | return misc_register(&vhci_miscdev); |
1da177e4 LT |
386 | } |
387 | ||
4aa769b9 | 388 | static void __exit vhci_exit(void) |
1da177e4 | 389 | { |
329ab1b3 | 390 | misc_deregister(&vhci_miscdev); |
1da177e4 LT |
391 | } |
392 | ||
4aa769b9 MH |
393 | module_init(vhci_init); |
394 | module_exit(vhci_exit); | |
395 | ||
36acbb1a AE |
396 | module_param(amp, bool, 0644); |
397 | MODULE_PARM_DESC(amp, "Create AMP controller device"); | |
398 | ||
63fbd24e | 399 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
4aa769b9 MH |
400 | MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); |
401 | MODULE_VERSION(VERSION); | |
402 | MODULE_LICENSE("GPL"); | |
bfacbb9a | 403 | MODULE_ALIAS("devname:vhci"); |
b075dd40 | 404 | MODULE_ALIAS_MISCDEV(VHCI_MINOR); |