1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * |
4 | * Bluetooth virtual HCI driver |
5 | * |
6 | * Copyright (C) 2000-2001 Qualcomm Incorporated |
7 | * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com> |
8 | * Copyright (C) 2004-2006 Marcel Holtmann <marcel@holtmann.org> |
9 | */ |
10 | |
11 | #include <linux/module.h> |
12 | #include <asm/unaligned.h> |
13 | |
14 | #include <linux/atomic.h> |
15 | #include <linux/kernel.h> |
16 | #include <linux/init.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/types.h> |
19 | #include <linux/errno.h> |
20 | #include <linux/sched.h> |
21 | #include <linux/poll.h> |
22 | |
23 | #include <linux/skbuff.h> |
24 | #include <linux/miscdevice.h> |
25 | #include <linux/debugfs.h> |
26 | |
27 | #include <net/bluetooth/bluetooth.h> |
28 | #include <net/bluetooth/hci_core.h> |
29 | |
30 | #define VERSION "1.5" |
31 | |
32 | static bool amp; |
33 | |
34 | struct vhci_data { |
35 | struct hci_dev *hdev; |
36 | |
37 | wait_queue_head_t read_wait; |
38 | struct sk_buff_head readq; |
39 | |
40 | struct mutex open_mutex; |
41 | struct delayed_work open_timeout; |
42 | struct work_struct suspend_work; |
43 | |
44 | bool suspended; |
45 | bool wakeup; |
46 | __u16 msft_opcode; |
47 | bool aosp_capable; |
48 | atomic_t initialized; |
49 | }; |
50 | |
51 | static int vhci_open_dev(struct hci_dev *hdev) |
52 | { |
53 | return 0; |
54 | } |
55 | |
56 | static int vhci_close_dev(struct hci_dev *hdev) |
57 | { |
58 | struct vhci_data *data = hci_get_drvdata(hdev); |
59 | |
60 | skb_queue_purge(list: &data->readq); |
61 | |
62 | return 0; |
63 | } |
64 | |
65 | static int vhci_flush(struct hci_dev *hdev) |
66 | { |
67 | struct vhci_data *data = hci_get_drvdata(hdev); |
68 | |
69 | skb_queue_purge(list: &data->readq); |
70 | |
71 | return 0; |
72 | } |
73 | |
74 | static int vhci_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
75 | { |
76 | struct vhci_data *data = hci_get_drvdata(hdev); |
77 | |
78 | memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); |
79 | |
80 | skb_queue_tail(list: &data->readq, newsk: skb); |
81 | |
82 | if (atomic_read(v: &data->initialized)) |
83 | wake_up_interruptible(&data->read_wait); |
84 | return 0; |
85 | } |
86 | |
87 | static int vhci_get_data_path_id(struct hci_dev *hdev, u8 *data_path_id) |
88 | { |
89 | *data_path_id = 0; |
90 | return 0; |
91 | } |
92 | |
93 | static int vhci_get_codec_config_data(struct hci_dev *hdev, __u8 type, |
94 | struct bt_codec *codec, __u8 *vnd_len, |
95 | __u8 **vnd_data) |
96 | { |
97 | if (type != ESCO_LINK) |
98 | return -EINVAL; |
99 | |
100 | *vnd_len = 0; |
101 | *vnd_data = NULL; |
102 | return 0; |
103 | } |
104 | |
105 | static bool vhci_wakeup(struct hci_dev *hdev) |
106 | { |
107 | struct vhci_data *data = hci_get_drvdata(hdev); |
108 | |
109 | return data->wakeup; |
110 | } |
111 | |
112 | static ssize_t force_suspend_read(struct file *file, char __user *user_buf, |
113 | size_t count, loff_t *ppos) |
114 | { |
115 | struct vhci_data *data = file->private_data; |
116 | char buf[3]; |
117 | |
118 | buf[0] = data->suspended ? 'Y' : 'N'; |
119 | buf[1] = '\n'; |
120 | buf[2] = '\0'; |
121 | return simple_read_from_buffer(to: user_buf, count, ppos, from: buf, available: 2); |
122 | } |
123 | |
124 | static void vhci_suspend_work(struct work_struct *work) |
125 | { |
126 | struct vhci_data *data = container_of(work, struct vhci_data, |
127 | suspend_work); |
128 | |
129 | if (data->suspended) |
130 | hci_suspend_dev(hdev: data->hdev); |
131 | else |
132 | hci_resume_dev(hdev: data->hdev); |
133 | } |
134 | |
135 | static ssize_t force_suspend_write(struct file *file, |
136 | const char __user *user_buf, |
137 | size_t count, loff_t *ppos) |
138 | { |
139 | struct vhci_data *data = file->private_data; |
140 | bool enable; |
141 | int err; |
142 | |
143 | err = kstrtobool_from_user(s: user_buf, count, res: &enable); |
144 | if (err) |
145 | return err; |
146 | |
147 | if (data->suspended == enable) |
148 | return -EALREADY; |
149 | |
150 | data->suspended = enable; |
151 | |
152 | schedule_work(work: &data->suspend_work); |
153 | |
154 | return count; |
155 | } |
156 | |
157 | static const struct file_operations force_suspend_fops = { |
158 | .open = simple_open, |
159 | .read = force_suspend_read, |
160 | .write = force_suspend_write, |
161 | .llseek = default_llseek, |
162 | }; |
163 | |
164 | static ssize_t force_wakeup_read(struct file *file, char __user *user_buf, |
165 | size_t count, loff_t *ppos) |
166 | { |
167 | struct vhci_data *data = file->private_data; |
168 | char buf[3]; |
169 | |
170 | buf[0] = data->wakeup ? 'Y' : 'N'; |
171 | buf[1] = '\n'; |
172 | buf[2] = '\0'; |
173 | return simple_read_from_buffer(to: user_buf, count, ppos, from: buf, available: 2); |
174 | } |
175 | |
176 | static ssize_t force_wakeup_write(struct file *file, |
177 | const char __user *user_buf, size_t count, |
178 | loff_t *ppos) |
179 | { |
180 | struct vhci_data *data = file->private_data; |
181 | bool enable; |
182 | int err; |
183 | |
184 | err = kstrtobool_from_user(s: user_buf, count, res: &enable); |
185 | if (err) |
186 | return err; |
187 | |
188 | if (data->wakeup == enable) |
189 | return -EALREADY; |
190 | |
191 | data->wakeup = enable; |
192 | |
193 | return count; |
194 | } |
195 | |
196 | static const struct file_operations force_wakeup_fops = { |
197 | .open = simple_open, |
198 | .read = force_wakeup_read, |
199 | .write = force_wakeup_write, |
200 | .llseek = default_llseek, |
201 | }; |
202 | |
203 | static int msft_opcode_set(void *data, u64 val) |
204 | { |
205 | struct vhci_data *vhci = data; |
206 | |
207 | if (val > 0xffff || hci_opcode_ogf(val) != 0x3f) |
208 | return -EINVAL; |
209 | |
210 | if (vhci->msft_opcode) |
211 | return -EALREADY; |
212 | |
213 | vhci->msft_opcode = val; |
214 | |
215 | return 0; |
216 | } |
217 | |
218 | static int msft_opcode_get(void *data, u64 *val) |
219 | { |
220 | struct vhci_data *vhci = data; |
221 | |
222 | *val = vhci->msft_opcode; |
223 | |
224 | return 0; |
225 | } |
226 | |
227 | DEFINE_DEBUGFS_ATTRIBUTE(msft_opcode_fops, msft_opcode_get, msft_opcode_set, |
228 | "%llu\n" ); |
229 | |
230 | static ssize_t aosp_capable_read(struct file *file, char __user *user_buf, |
231 | size_t count, loff_t *ppos) |
232 | { |
233 | struct vhci_data *vhci = file->private_data; |
234 | char buf[3]; |
235 | |
236 | buf[0] = vhci->aosp_capable ? 'Y' : 'N'; |
237 | buf[1] = '\n'; |
238 | buf[2] = '\0'; |
239 | return simple_read_from_buffer(to: user_buf, count, ppos, from: buf, available: 2); |
240 | } |
241 | |
242 | static ssize_t aosp_capable_write(struct file *file, |
243 | const char __user *user_buf, size_t count, |
244 | loff_t *ppos) |
245 | { |
246 | struct vhci_data *vhci = file->private_data; |
247 | bool enable; |
248 | int err; |
249 | |
250 | err = kstrtobool_from_user(s: user_buf, count, res: &enable); |
251 | if (err) |
252 | return err; |
253 | |
254 | if (!enable) |
255 | return -EINVAL; |
256 | |
257 | if (vhci->aosp_capable) |
258 | return -EALREADY; |
259 | |
260 | vhci->aosp_capable = enable; |
261 | |
262 | return count; |
263 | } |
264 | |
265 | static const struct file_operations aosp_capable_fops = { |
266 | .open = simple_open, |
267 | .read = aosp_capable_read, |
268 | .write = aosp_capable_write, |
269 | .llseek = default_llseek, |
270 | }; |
271 | |
272 | static int vhci_setup(struct hci_dev *hdev) |
273 | { |
274 | struct vhci_data *vhci = hci_get_drvdata(hdev); |
275 | |
276 | if (vhci->msft_opcode) |
277 | hci_set_msft_opcode(hdev, opcode: vhci->msft_opcode); |
278 | |
279 | if (vhci->aosp_capable) |
280 | hci_set_aosp_capable(hdev); |
281 | |
282 | return 0; |
283 | } |
284 | |
285 | static void vhci_coredump(struct hci_dev *hdev) |
286 | { |
287 | /* No need to do anything */ |
288 | } |
289 | |
290 | static void vhci_coredump_hdr(struct hci_dev *hdev, struct sk_buff *skb) |
291 | { |
292 | char buf[80]; |
293 | |
294 | snprintf(buf, size: sizeof(buf), fmt: "Controller Name: vhci_ctrl\n" ); |
295 | skb_put_data(skb, data: buf, strlen(buf)); |
296 | |
297 | snprintf(buf, size: sizeof(buf), fmt: "Firmware Version: vhci_fw\n" ); |
298 | skb_put_data(skb, data: buf, strlen(buf)); |
299 | |
300 | snprintf(buf, size: sizeof(buf), fmt: "Driver: vhci_drv\n" ); |
301 | skb_put_data(skb, data: buf, strlen(buf)); |
302 | |
303 | snprintf(buf, size: sizeof(buf), fmt: "Vendor: vhci\n" ); |
304 | skb_put_data(skb, data: buf, strlen(buf)); |
305 | } |
306 | |
307 | #define MAX_COREDUMP_LINE_LEN 40 |
308 | |
309 | struct devcoredump_test_data { |
310 | enum devcoredump_state state; |
311 | unsigned int timeout; |
312 | char data[MAX_COREDUMP_LINE_LEN]; |
313 | }; |
314 | |
315 | static inline void force_devcd_timeout(struct hci_dev *hdev, |
316 | unsigned int timeout) |
317 | { |
318 | #ifdef CONFIG_DEV_COREDUMP |
319 | hdev->dump.timeout = msecs_to_jiffies(m: timeout * 1000); |
320 | #endif |
321 | } |
322 | |
323 | static ssize_t force_devcd_write(struct file *file, const char __user *user_buf, |
324 | size_t count, loff_t *ppos) |
325 | { |
326 | struct vhci_data *data = file->private_data; |
327 | struct hci_dev *hdev = data->hdev; |
328 | struct sk_buff *skb = NULL; |
329 | struct devcoredump_test_data dump_data; |
330 | size_t data_size; |
331 | int ret; |
332 | |
333 | if (count < offsetof(struct devcoredump_test_data, data) || |
334 | count > sizeof(dump_data)) |
335 | return -EINVAL; |
336 | |
337 | if (copy_from_user(to: &dump_data, from: user_buf, n: count)) |
338 | return -EFAULT; |
339 | |
340 | data_size = count - offsetof(struct devcoredump_test_data, data); |
341 | skb = alloc_skb(size: data_size, GFP_ATOMIC); |
342 | if (!skb) |
343 | return -ENOMEM; |
344 | skb_put_data(skb, data: &dump_data.data, len: data_size); |
345 | |
346 | hci_devcd_register(hdev, coredump: vhci_coredump, dmp_hdr: vhci_coredump_hdr, NULL); |
347 | |
348 | /* Force the devcoredump timeout */ |
349 | if (dump_data.timeout) |
350 | force_devcd_timeout(hdev, timeout: dump_data.timeout); |
351 | |
352 | ret = hci_devcd_init(hdev, dump_size: skb->len); |
353 | if (ret) { |
354 | BT_ERR("Failed to generate devcoredump" ); |
355 | kfree_skb(skb); |
356 | return ret; |
357 | } |
358 | |
359 | hci_devcd_append(hdev, skb); |
360 | |
361 | switch (dump_data.state) { |
362 | case HCI_DEVCOREDUMP_DONE: |
363 | hci_devcd_complete(hdev); |
364 | break; |
365 | case HCI_DEVCOREDUMP_ABORT: |
366 | hci_devcd_abort(hdev); |
367 | break; |
368 | case HCI_DEVCOREDUMP_TIMEOUT: |
369 | /* Do nothing */ |
370 | break; |
371 | default: |
372 | return -EINVAL; |
373 | } |
374 | |
375 | return count; |
376 | } |
377 | |
378 | static const struct file_operations force_devcoredump_fops = { |
379 | .open = simple_open, |
380 | .write = force_devcd_write, |
381 | }; |
382 | |
383 | static int __vhci_create_device(struct vhci_data *data, __u8 opcode) |
384 | { |
385 | struct hci_dev *hdev; |
386 | struct sk_buff *skb; |
387 | __u8 dev_type; |
388 | |
389 | if (data->hdev) |
390 | return -EBADFD; |
391 | |
392 | /* bits 0-1 are dev_type (Primary or AMP) */ |
393 | dev_type = opcode & 0x03; |
394 | |
395 | if (dev_type != HCI_PRIMARY && dev_type != HCI_AMP) |
396 | return -EINVAL; |
397 | |
398 | /* bits 2-5 are reserved (must be zero) */ |
399 | if (opcode & 0x3c) |
400 | return -EINVAL; |
401 | |
402 | skb = bt_skb_alloc(len: 4, GFP_KERNEL); |
403 | if (!skb) |
404 | return -ENOMEM; |
405 | |
406 | hdev = hci_alloc_dev(); |
407 | if (!hdev) { |
408 | kfree_skb(skb); |
409 | return -ENOMEM; |
410 | } |
411 | |
412 | data->hdev = hdev; |
413 | |
414 | hdev->bus = HCI_VIRTUAL; |
415 | hdev->dev_type = dev_type; |
416 | hci_set_drvdata(hdev, data); |
417 | |
418 | hdev->open = vhci_open_dev; |
419 | hdev->close = vhci_close_dev; |
420 | hdev->flush = vhci_flush; |
421 | hdev->send = vhci_send_frame; |
422 | hdev->get_data_path_id = vhci_get_data_path_id; |
423 | hdev->get_codec_config_data = vhci_get_codec_config_data; |
424 | hdev->wakeup = vhci_wakeup; |
425 | hdev->setup = vhci_setup; |
426 | set_bit(nr: HCI_QUIRK_NON_PERSISTENT_SETUP, addr: &hdev->quirks); |
427 | |
428 | /* bit 6 is for external configuration */ |
429 | if (opcode & 0x40) |
430 | set_bit(nr: HCI_QUIRK_EXTERNAL_CONFIG, addr: &hdev->quirks); |
431 | |
432 | /* bit 7 is for raw device */ |
433 | if (opcode & 0x80) |
434 | set_bit(nr: HCI_QUIRK_RAW_DEVICE, addr: &hdev->quirks); |
435 | |
436 | set_bit(nr: HCI_QUIRK_VALID_LE_STATES, addr: &hdev->quirks); |
437 | |
438 | if (hci_register_dev(hdev) < 0) { |
439 | BT_ERR("Can't register HCI device" ); |
440 | hci_free_dev(hdev); |
441 | data->hdev = NULL; |
442 | kfree_skb(skb); |
443 | return -EBUSY; |
444 | } |
445 | |
446 | debugfs_create_file(name: "force_suspend" , mode: 0644, parent: hdev->debugfs, data, |
447 | fops: &force_suspend_fops); |
448 | |
449 | debugfs_create_file(name: "force_wakeup" , mode: 0644, parent: hdev->debugfs, data, |
450 | fops: &force_wakeup_fops); |
451 | |
452 | if (IS_ENABLED(CONFIG_BT_MSFTEXT)) |
453 | debugfs_create_file(name: "msft_opcode" , mode: 0644, parent: hdev->debugfs, data, |
454 | fops: &msft_opcode_fops); |
455 | |
456 | if (IS_ENABLED(CONFIG_BT_AOSPEXT)) |
457 | debugfs_create_file(name: "aosp_capable" , mode: 0644, parent: hdev->debugfs, data, |
458 | fops: &aosp_capable_fops); |
459 | |
460 | debugfs_create_file(name: "force_devcoredump" , mode: 0644, parent: hdev->debugfs, data, |
461 | fops: &force_devcoredump_fops); |
462 | |
463 | hci_skb_pkt_type(skb) = HCI_VENDOR_PKT; |
464 | |
465 | skb_put_u8(skb, val: 0xff); |
466 | skb_put_u8(skb, val: opcode); |
467 | put_unaligned_le16(val: hdev->id, p: skb_put(skb, len: 2)); |
468 | skb_queue_head(list: &data->readq, newsk: skb); |
469 | atomic_inc(v: &data->initialized); |
470 | |
471 | wake_up_interruptible(&data->read_wait); |
472 | return 0; |
473 | } |
474 | |
475 | static int vhci_create_device(struct vhci_data *data, __u8 opcode) |
476 | { |
477 | int err; |
478 | |
479 | mutex_lock(&data->open_mutex); |
480 | err = __vhci_create_device(data, opcode); |
481 | mutex_unlock(lock: &data->open_mutex); |
482 | |
483 | return err; |
484 | } |
485 | |
486 | static inline ssize_t vhci_get_user(struct vhci_data *data, |
487 | struct iov_iter *from) |
488 | { |
489 | size_t len = iov_iter_count(i: from); |
490 | struct sk_buff *skb; |
491 | __u8 pkt_type, opcode; |
492 | int ret; |
493 | |
494 | if (len < 2 || len > HCI_MAX_FRAME_SIZE) |
495 | return -EINVAL; |
496 | |
497 | skb = bt_skb_alloc(len, GFP_KERNEL); |
498 | if (!skb) |
499 | return -ENOMEM; |
500 | |
501 | if (!copy_from_iter_full(addr: skb_put(skb, len), bytes: len, i: from)) { |
502 | kfree_skb(skb); |
503 | return -EFAULT; |
504 | } |
505 | |
506 | pkt_type = *((__u8 *) skb->data); |
507 | skb_pull(skb, len: 1); |
508 | |
509 | switch (pkt_type) { |
510 | case HCI_EVENT_PKT: |
511 | case HCI_ACLDATA_PKT: |
512 | case HCI_SCODATA_PKT: |
513 | case HCI_ISODATA_PKT: |
514 | if (!data->hdev) { |
515 | kfree_skb(skb); |
516 | return -ENODEV; |
517 | } |
518 | |
519 | hci_skb_pkt_type(skb) = pkt_type; |
520 | |
521 | ret = hci_recv_frame(hdev: data->hdev, skb); |
522 | break; |
523 | |
524 | case HCI_VENDOR_PKT: |
525 | cancel_delayed_work_sync(dwork: &data->open_timeout); |
526 | |
527 | opcode = *((__u8 *) skb->data); |
528 | skb_pull(skb, len: 1); |
529 | |
530 | if (skb->len > 0) { |
531 | kfree_skb(skb); |
532 | return -EINVAL; |
533 | } |
534 | |
535 | kfree_skb(skb); |
536 | |
537 | ret = vhci_create_device(data, opcode); |
538 | break; |
539 | |
540 | default: |
541 | kfree_skb(skb); |
542 | return -EINVAL; |
543 | } |
544 | |
545 | return (ret < 0) ? ret : len; |
546 | } |
547 | |
548 | static inline ssize_t vhci_put_user(struct vhci_data *data, |
549 | struct sk_buff *skb, |
550 | char __user *buf, int count) |
551 | { |
552 | char __user *ptr = buf; |
553 | int len; |
554 | |
555 | len = min_t(unsigned int, skb->len, count); |
556 | |
557 | if (copy_to_user(to: ptr, from: skb->data, n: len)) |
558 | return -EFAULT; |
559 | |
560 | if (!data->hdev) |
561 | return len; |
562 | |
563 | data->hdev->stat.byte_tx += len; |
564 | |
565 | switch (hci_skb_pkt_type(skb)) { |
566 | case HCI_COMMAND_PKT: |
567 | data->hdev->stat.cmd_tx++; |
568 | break; |
569 | case HCI_ACLDATA_PKT: |
570 | data->hdev->stat.acl_tx++; |
571 | break; |
572 | case HCI_SCODATA_PKT: |
573 | data->hdev->stat.sco_tx++; |
574 | break; |
575 | } |
576 | |
577 | return len; |
578 | } |
579 | |
580 | static ssize_t vhci_read(struct file *file, |
581 | char __user *buf, size_t count, loff_t *pos) |
582 | { |
583 | struct vhci_data *data = file->private_data; |
584 | struct sk_buff *skb; |
585 | ssize_t ret = 0; |
586 | |
587 | while (count) { |
588 | skb = skb_dequeue(list: &data->readq); |
589 | if (skb) { |
590 | ret = vhci_put_user(data, skb, buf, count); |
591 | if (ret < 0) |
592 | skb_queue_head(list: &data->readq, newsk: skb); |
593 | else |
594 | kfree_skb(skb); |
595 | break; |
596 | } |
597 | |
598 | if (file->f_flags & O_NONBLOCK) { |
599 | ret = -EAGAIN; |
600 | break; |
601 | } |
602 | |
603 | ret = wait_event_interruptible(data->read_wait, |
604 | !skb_queue_empty(&data->readq)); |
605 | if (ret < 0) |
606 | break; |
607 | } |
608 | |
609 | return ret; |
610 | } |
611 | |
612 | static ssize_t vhci_write(struct kiocb *iocb, struct iov_iter *from) |
613 | { |
614 | struct file *file = iocb->ki_filp; |
615 | struct vhci_data *data = file->private_data; |
616 | |
617 | return vhci_get_user(data, from); |
618 | } |
619 | |
620 | static __poll_t vhci_poll(struct file *file, poll_table *wait) |
621 | { |
622 | struct vhci_data *data = file->private_data; |
623 | |
624 | poll_wait(filp: file, wait_address: &data->read_wait, p: wait); |
625 | |
626 | if (!skb_queue_empty(list: &data->readq)) |
627 | return EPOLLIN | EPOLLRDNORM; |
628 | |
629 | return EPOLLOUT | EPOLLWRNORM; |
630 | } |
631 | |
632 | static void vhci_open_timeout(struct work_struct *work) |
633 | { |
634 | struct vhci_data *data = container_of(work, struct vhci_data, |
635 | open_timeout.work); |
636 | |
637 | vhci_create_device(data, opcode: amp ? HCI_AMP : HCI_PRIMARY); |
638 | } |
639 | |
640 | static int vhci_open(struct inode *inode, struct file *file) |
641 | { |
642 | struct vhci_data *data; |
643 | |
644 | data = kzalloc(size: sizeof(struct vhci_data), GFP_KERNEL); |
645 | if (!data) |
646 | return -ENOMEM; |
647 | |
648 | skb_queue_head_init(list: &data->readq); |
649 | init_waitqueue_head(&data->read_wait); |
650 | |
651 | mutex_init(&data->open_mutex); |
652 | INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout); |
653 | INIT_WORK(&data->suspend_work, vhci_suspend_work); |
654 | |
655 | file->private_data = data; |
656 | nonseekable_open(inode, filp: file); |
657 | |
658 | schedule_delayed_work(dwork: &data->open_timeout, delay: msecs_to_jiffies(m: 1000)); |
659 | |
660 | return 0; |
661 | } |
662 | |
663 | static int vhci_release(struct inode *inode, struct file *file) |
664 | { |
665 | struct vhci_data *data = file->private_data; |
666 | struct hci_dev *hdev; |
667 | |
668 | cancel_delayed_work_sync(dwork: &data->open_timeout); |
669 | flush_work(work: &data->suspend_work); |
670 | |
671 | hdev = data->hdev; |
672 | |
673 | if (hdev) { |
674 | hci_unregister_dev(hdev); |
675 | hci_free_dev(hdev); |
676 | } |
677 | |
678 | skb_queue_purge(list: &data->readq); |
679 | file->private_data = NULL; |
680 | kfree(objp: data); |
681 | |
682 | return 0; |
683 | } |
684 | |
685 | static const struct file_operations vhci_fops = { |
686 | .owner = THIS_MODULE, |
687 | .read = vhci_read, |
688 | .write_iter = vhci_write, |
689 | .poll = vhci_poll, |
690 | .open = vhci_open, |
691 | .release = vhci_release, |
692 | .llseek = no_llseek, |
693 | }; |
694 | |
695 | static struct miscdevice vhci_miscdev = { |
696 | .name = "vhci" , |
697 | .fops = &vhci_fops, |
698 | .minor = VHCI_MINOR, |
699 | }; |
700 | module_misc_device(vhci_miscdev); |
701 | |
702 | module_param(amp, bool, 0644); |
703 | MODULE_PARM_DESC(amp, "Create AMP controller device" ); |
704 | |
705 | MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>" ); |
706 | MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); |
707 | MODULE_VERSION(VERSION); |
708 | MODULE_LICENSE("GPL" ); |
709 | MODULE_ALIAS("devname:vhci" ); |
710 | MODULE_ALIAS_MISCDEV(VHCI_MINOR); |
711 | |