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1 | /* | |
2 | * | |
3 | * Bluetooth virtual HCI driver | |
4 | * | |
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> | |
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 | * | |
24 | */ | |
25 | ||
26 | #include <linux/module.h> | |
27 | #include <asm/unaligned.h> | |
28 | ||
29 | #include <linux/kernel.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/types.h> | |
33 | #include <linux/errno.h> | |
34 | #include <linux/sched.h> | |
35 | #include <linux/poll.h> | |
36 | ||
37 | #include <linux/skbuff.h> | |
38 | #include <linux/miscdevice.h> | |
39 | ||
40 | #include <net/bluetooth/bluetooth.h> | |
41 | #include <net/bluetooth/hci_core.h> | |
42 | ||
43 | #define VERSION "1.4" | |
44 | ||
45 | static bool amp; | |
46 | ||
47 | struct vhci_data { | |
48 | struct hci_dev *hdev; | |
49 | ||
50 | wait_queue_head_t read_wait; | |
51 | struct sk_buff_head readq; | |
52 | ||
53 | struct delayed_work open_timeout; | |
54 | }; | |
55 | ||
56 | static int vhci_open_dev(struct hci_dev *hdev) | |
57 | { | |
58 | set_bit(HCI_RUNNING, &hdev->flags); | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | static int vhci_close_dev(struct hci_dev *hdev) | |
64 | { | |
65 | struct vhci_data *data = hci_get_drvdata(hdev); | |
66 | ||
67 | if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) | |
68 | return 0; | |
69 | ||
70 | skb_queue_purge(&data->readq); | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | static int vhci_flush(struct hci_dev *hdev) | |
76 | { | |
77 | struct vhci_data *data = hci_get_drvdata(hdev); | |
78 | ||
79 | skb_queue_purge(&data->readq); | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | static int vhci_send_frame(struct hci_dev *hdev, struct sk_buff *skb) | |
85 | { | |
86 | struct vhci_data *data = hci_get_drvdata(hdev); | |
87 | ||
88 | if (!test_bit(HCI_RUNNING, &hdev->flags)) | |
89 | return -EBUSY; | |
90 | ||
91 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); | |
92 | skb_queue_tail(&data->readq, skb); | |
93 | ||
94 | wake_up_interruptible(&data->read_wait); | |
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; | |
123 | ||
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); | |
140 | return 0; | |
141 | } | |
142 | ||
143 | static inline ssize_t vhci_get_user(struct vhci_data *data, | |
144 | const struct iovec *iov, | |
145 | unsigned long count) | |
146 | { | |
147 | size_t len = iov_length(iov, count); | |
148 | struct sk_buff *skb; | |
149 | __u8 pkt_type, dev_type; | |
150 | unsigned long i; | |
151 | int ret; | |
152 | ||
153 | if (len < 2 || len > HCI_MAX_FRAME_SIZE) | |
154 | return -EINVAL; | |
155 | ||
156 | skb = bt_skb_alloc(len, GFP_KERNEL); | |
157 | if (!skb) | |
158 | return -ENOMEM; | |
159 | ||
160 | for (i = 0; i < count; i++) { | |
161 | if (copy_from_user(skb_put(skb, iov[i].iov_len), | |
162 | iov[i].iov_base, iov[i].iov_len)) { | |
163 | kfree_skb(skb); | |
164 | return -EFAULT; | |
165 | } | |
166 | } | |
167 | ||
168 | pkt_type = *((__u8 *) skb->data); | |
169 | skb_pull(skb, 1); | |
170 | ||
171 | switch (pkt_type) { | |
172 | case HCI_EVENT_PKT: | |
173 | case HCI_ACLDATA_PKT: | |
174 | case HCI_SCODATA_PKT: | |
175 | if (!data->hdev) { | |
176 | kfree_skb(skb); | |
177 | return -ENODEV; | |
178 | } | |
179 | ||
180 | bt_cb(skb)->pkt_type = pkt_type; | |
181 | ||
182 | ret = hci_recv_frame(data->hdev, skb); | |
183 | break; | |
184 | ||
185 | case HCI_VENDOR_PKT: | |
186 | if (data->hdev) { | |
187 | kfree_skb(skb); | |
188 | return -EBADFD; | |
189 | } | |
190 | ||
191 | cancel_delayed_work_sync(&data->open_timeout); | |
192 | ||
193 | dev_type = *((__u8 *) skb->data); | |
194 | skb_pull(skb, 1); | |
195 | ||
196 | if (skb->len > 0) { | |
197 | kfree_skb(skb); | |
198 | return -EINVAL; | |
199 | } | |
200 | ||
201 | kfree_skb(skb); | |
202 | ||
203 | if (dev_type != HCI_BREDR && dev_type != HCI_AMP) | |
204 | return -EINVAL; | |
205 | ||
206 | ret = vhci_create_device(data, dev_type); | |
207 | break; | |
208 | ||
209 | default: | |
210 | kfree_skb(skb); | |
211 | return -EINVAL; | |
212 | } | |
213 | ||
214 | return (ret < 0) ? ret : len; | |
215 | } | |
216 | ||
217 | static inline ssize_t vhci_put_user(struct vhci_data *data, | |
218 | struct sk_buff *skb, | |
219 | char __user *buf, int count) | |
220 | { | |
221 | char __user *ptr = buf; | |
222 | int len; | |
223 | ||
224 | len = min_t(unsigned int, skb->len, count); | |
225 | ||
226 | if (copy_to_user(ptr, skb->data, len)) | |
227 | return -EFAULT; | |
228 | ||
229 | if (!data->hdev) | |
230 | return len; | |
231 | ||
232 | data->hdev->stat.byte_tx += len; | |
233 | ||
234 | switch (bt_cb(skb)->pkt_type) { | |
235 | case HCI_COMMAND_PKT: | |
236 | data->hdev->stat.cmd_tx++; | |
237 | break; | |
238 | case HCI_ACLDATA_PKT: | |
239 | data->hdev->stat.acl_tx++; | |
240 | break; | |
241 | case HCI_SCODATA_PKT: | |
242 | data->hdev->stat.sco_tx++; | |
243 | break; | |
244 | } | |
245 | ||
246 | return len; | |
247 | } | |
248 | ||
249 | static ssize_t vhci_read(struct file *file, | |
250 | char __user *buf, size_t count, loff_t *pos) | |
251 | { | |
252 | struct vhci_data *data = file->private_data; | |
253 | struct sk_buff *skb; | |
254 | ssize_t ret = 0; | |
255 | ||
256 | while (count) { | |
257 | skb = skb_dequeue(&data->readq); | |
258 | if (skb) { | |
259 | ret = vhci_put_user(data, skb, buf, count); | |
260 | if (ret < 0) | |
261 | skb_queue_head(&data->readq, skb); | |
262 | else | |
263 | kfree_skb(skb); | |
264 | break; | |
265 | } | |
266 | ||
267 | if (file->f_flags & O_NONBLOCK) { | |
268 | ret = -EAGAIN; | |
269 | break; | |
270 | } | |
271 | ||
272 | ret = wait_event_interruptible(data->read_wait, | |
273 | !skb_queue_empty(&data->readq)); | |
274 | if (ret < 0) | |
275 | break; | |
276 | } | |
277 | ||
278 | return ret; | |
279 | } | |
280 | ||
281 | static ssize_t vhci_write(struct kiocb *iocb, const struct iovec *iov, | |
282 | unsigned long count, loff_t pos) | |
283 | { | |
284 | struct file *file = iocb->ki_filp; | |
285 | struct vhci_data *data = file->private_data; | |
286 | ||
287 | return vhci_get_user(data, iov, count); | |
288 | } | |
289 | ||
290 | static unsigned int vhci_poll(struct file *file, poll_table *wait) | |
291 | { | |
292 | struct vhci_data *data = file->private_data; | |
293 | ||
294 | poll_wait(file, &data->read_wait, wait); | |
295 | ||
296 | if (!skb_queue_empty(&data->readq)) | |
297 | return POLLIN | POLLRDNORM; | |
298 | ||
299 | return POLLOUT | POLLWRNORM; | |
300 | } | |
301 | ||
302 | static void vhci_open_timeout(struct work_struct *work) | |
303 | { | |
304 | struct vhci_data *data = container_of(work, struct vhci_data, | |
305 | open_timeout.work); | |
306 | ||
307 | vhci_create_device(data, amp ? HCI_AMP : HCI_BREDR); | |
308 | } | |
309 | ||
310 | static int vhci_open(struct inode *inode, struct file *file) | |
311 | { | |
312 | struct vhci_data *data; | |
313 | ||
314 | data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL); | |
315 | if (!data) | |
316 | return -ENOMEM; | |
317 | ||
318 | skb_queue_head_init(&data->readq); | |
319 | init_waitqueue_head(&data->read_wait); | |
320 | ||
321 | INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout); | |
322 | ||
323 | file->private_data = data; | |
324 | nonseekable_open(inode, file); | |
325 | ||
326 | schedule_delayed_work(&data->open_timeout, msecs_to_jiffies(1000)); | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | static int vhci_release(struct inode *inode, struct file *file) | |
332 | { | |
333 | struct vhci_data *data = file->private_data; | |
334 | struct hci_dev *hdev = data->hdev; | |
335 | ||
336 | cancel_delayed_work_sync(&data->open_timeout); | |
337 | ||
338 | if (hdev) { | |
339 | hci_unregister_dev(hdev); | |
340 | hci_free_dev(hdev); | |
341 | } | |
342 | ||
343 | file->private_data = NULL; | |
344 | kfree(data); | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
349 | static const struct file_operations vhci_fops = { | |
350 | .owner = THIS_MODULE, | |
351 | .read = vhci_read, | |
352 | .aio_write = vhci_write, | |
353 | .poll = vhci_poll, | |
354 | .open = vhci_open, | |
355 | .release = vhci_release, | |
356 | .llseek = no_llseek, | |
357 | }; | |
358 | ||
359 | static struct miscdevice vhci_miscdev= { | |
360 | .name = "vhci", | |
361 | .fops = &vhci_fops, | |
362 | .minor = MISC_DYNAMIC_MINOR, | |
363 | }; | |
364 | ||
365 | static int __init vhci_init(void) | |
366 | { | |
367 | BT_INFO("Virtual HCI driver ver %s", VERSION); | |
368 | ||
369 | return misc_register(&vhci_miscdev); | |
370 | } | |
371 | ||
372 | static void __exit vhci_exit(void) | |
373 | { | |
374 | misc_deregister(&vhci_miscdev); | |
375 | } | |
376 | ||
377 | module_init(vhci_init); | |
378 | module_exit(vhci_exit); | |
379 | ||
380 | module_param(amp, bool, 0644); | |
381 | MODULE_PARM_DESC(amp, "Create AMP controller device"); | |
382 | ||
383 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); | |
384 | MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); | |
385 | MODULE_VERSION(VERSION); | |
386 | MODULE_LICENSE("GPL"); | |
387 | MODULE_ALIAS("devname:vhci"); |