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