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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 <linux/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
32static bool amp;
33
34struct 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
51static int vhci_open_dev(struct hci_dev *hdev)
52{
53 return 0;
54}
55
56static int vhci_close_dev(struct hci_dev *hdev)
57{
58 struct vhci_data *data = hci_get_drvdata(hdev);
59
60 skb_queue_purge(&data->readq);
61
62 return 0;
63}
64
65static int vhci_flush(struct hci_dev *hdev)
66{
67 struct vhci_data *data = hci_get_drvdata(hdev);
68
69 skb_queue_purge(&data->readq);
70
71 return 0;
72}
73
74static 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(&data->readq, skb);
81
82 if (atomic_read(&data->initialized))
83 wake_up_interruptible(&data->read_wait);
84 return 0;
85}
86
87static 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
93static 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
105static bool vhci_wakeup(struct hci_dev *hdev)
106{
107 struct vhci_data *data = hci_get_drvdata(hdev);
108
109 return data->wakeup;
110}
111
112static 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(user_buf, count, ppos, buf, 2);
122}
123
124static 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(data->hdev);
131 else
132 hci_resume_dev(data->hdev);
133}
134
135static 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(user_buf, count, &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(&data->suspend_work);
153
154 return count;
155}
156
157static 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
164static 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(user_buf, count, ppos, buf, 2);
174}
175
176static 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(user_buf, count, &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
196static 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
203static 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
218static 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
227DEFINE_DEBUGFS_ATTRIBUTE(msft_opcode_fops, msft_opcode_get, msft_opcode_set,
228 "%llu\n");
229
230static 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(user_buf, count, ppos, buf, 2);
240}
241
242static 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(user_buf, count, &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
265static 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
272static 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, vhci->msft_opcode);
278
279 if (vhci->aosp_capable)
280 hci_set_aosp_capable(hdev);
281
282 return 0;
283}
284
285static void vhci_coredump(struct hci_dev *hdev)
286{
287 /* No need to do anything */
288}
289
290static void vhci_coredump_hdr(struct hci_dev *hdev, struct sk_buff *skb)
291{
292 char buf[80];
293
294 snprintf(buf, sizeof(buf), "Controller Name: vhci_ctrl\n");
295 skb_put_data(skb, buf, strlen(buf));
296
297 snprintf(buf, sizeof(buf), "Firmware Version: vhci_fw\n");
298 skb_put_data(skb, buf, strlen(buf));
299
300 snprintf(buf, sizeof(buf), "Driver: vhci_drv\n");
301 skb_put_data(skb, buf, strlen(buf));
302
303 snprintf(buf, sizeof(buf), "Vendor: vhci\n");
304 skb_put_data(skb, buf, strlen(buf));
305}
306
307#define MAX_COREDUMP_LINE_LEN 40
308
309struct devcoredump_test_data {
310 enum devcoredump_state state;
311 unsigned int timeout;
312 char data[MAX_COREDUMP_LINE_LEN];
313};
314
315static 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(timeout * 1000);
320#endif
321}
322
323static 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(&dump_data, user_buf, count))
338 return -EFAULT;
339
340 data_size = count - offsetof(struct devcoredump_test_data, data);
341 skb = alloc_skb(data_size, GFP_ATOMIC);
342 if (!skb)
343 return -ENOMEM;
344 skb_put_data(skb, &dump_data.data, data_size);
345
346 hci_devcd_register(hdev, vhci_coredump, vhci_coredump_hdr, NULL);
347
348 /* Force the devcoredump timeout */
349 if (dump_data.timeout)
350 force_devcd_timeout(hdev, dump_data.timeout);
351
352 ret = hci_devcd_init(hdev, 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
378static const struct file_operations force_devcoredump_fops = {
379 .open = simple_open,
380 .write = force_devcd_write,
381};
382
383static int __vhci_create_device(struct vhci_data *data, __u8 opcode)
384{
385 struct hci_dev *hdev;
386 struct sk_buff *skb;
387
388 if (data->hdev)
389 return -EBADFD;
390
391 /* bits 2-5 are reserved (must be zero) */
392 if (opcode & 0x3c)
393 return -EINVAL;
394
395 skb = bt_skb_alloc(4, GFP_KERNEL);
396 if (!skb)
397 return -ENOMEM;
398
399 hdev = hci_alloc_dev();
400 if (!hdev) {
401 kfree_skb(skb);
402 return -ENOMEM;
403 }
404
405 data->hdev = hdev;
406
407 hdev->bus = HCI_VIRTUAL;
408 hci_set_drvdata(hdev, data);
409
410 hdev->open = vhci_open_dev;
411 hdev->close = vhci_close_dev;
412 hdev->flush = vhci_flush;
413 hdev->send = vhci_send_frame;
414 hdev->get_data_path_id = vhci_get_data_path_id;
415 hdev->get_codec_config_data = vhci_get_codec_config_data;
416 hdev->wakeup = vhci_wakeup;
417 hdev->setup = vhci_setup;
418 set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
419
420 /* bit 6 is for external configuration */
421 if (opcode & 0x40)
422 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
423
424 /* bit 7 is for raw device */
425 if (opcode & 0x80)
426 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
427
428 if (hci_register_dev(hdev) < 0) {
429 BT_ERR("Can't register HCI device");
430 hci_free_dev(hdev);
431 data->hdev = NULL;
432 kfree_skb(skb);
433 return -EBUSY;
434 }
435
436 debugfs_create_file("force_suspend", 0644, hdev->debugfs, data,
437 &force_suspend_fops);
438
439 debugfs_create_file("force_wakeup", 0644, hdev->debugfs, data,
440 &force_wakeup_fops);
441
442 if (IS_ENABLED(CONFIG_BT_MSFTEXT))
443 debugfs_create_file("msft_opcode", 0644, hdev->debugfs, data,
444 &msft_opcode_fops);
445
446 if (IS_ENABLED(CONFIG_BT_AOSPEXT))
447 debugfs_create_file("aosp_capable", 0644, hdev->debugfs, data,
448 &aosp_capable_fops);
449
450 debugfs_create_file("force_devcoredump", 0644, hdev->debugfs, data,
451 &force_devcoredump_fops);
452
453 hci_skb_pkt_type(skb) = HCI_VENDOR_PKT;
454
455 skb_put_u8(skb, 0xff);
456 skb_put_u8(skb, opcode);
457 put_unaligned_le16(hdev->id, skb_put(skb, 2));
458 skb_queue_head(&data->readq, skb);
459 atomic_inc(&data->initialized);
460
461 wake_up_interruptible(&data->read_wait);
462 return 0;
463}
464
465static int vhci_create_device(struct vhci_data *data, __u8 opcode)
466{
467 int err;
468
469 mutex_lock(&data->open_mutex);
470 err = __vhci_create_device(data, opcode);
471 mutex_unlock(&data->open_mutex);
472
473 return err;
474}
475
476static inline ssize_t vhci_get_user(struct vhci_data *data,
477 struct iov_iter *from)
478{
479 size_t len = iov_iter_count(from);
480 struct sk_buff *skb;
481 __u8 pkt_type, opcode;
482 int ret;
483
484 if (len < 2 || len > HCI_MAX_FRAME_SIZE)
485 return -EINVAL;
486
487 skb = bt_skb_alloc(len, GFP_KERNEL);
488 if (!skb)
489 return -ENOMEM;
490
491 if (!copy_from_iter_full(skb_put(skb, len), len, from)) {
492 kfree_skb(skb);
493 return -EFAULT;
494 }
495
496 pkt_type = *((__u8 *) skb->data);
497 skb_pull(skb, 1);
498
499 switch (pkt_type) {
500 case HCI_EVENT_PKT:
501 case HCI_ACLDATA_PKT:
502 case HCI_SCODATA_PKT:
503 case HCI_ISODATA_PKT:
504 if (!data->hdev) {
505 kfree_skb(skb);
506 return -ENODEV;
507 }
508
509 hci_skb_pkt_type(skb) = pkt_type;
510
511 ret = hci_recv_frame(data->hdev, skb);
512 break;
513
514 case HCI_VENDOR_PKT:
515 cancel_delayed_work_sync(&data->open_timeout);
516
517 opcode = *((__u8 *) skb->data);
518 skb_pull(skb, 1);
519
520 if (skb->len > 0) {
521 kfree_skb(skb);
522 return -EINVAL;
523 }
524
525 kfree_skb(skb);
526
527 ret = vhci_create_device(data, opcode);
528 break;
529
530 default:
531 kfree_skb(skb);
532 return -EINVAL;
533 }
534
535 return (ret < 0) ? ret : len;
536}
537
538static inline ssize_t vhci_put_user(struct vhci_data *data,
539 struct sk_buff *skb,
540 char __user *buf, int count)
541{
542 char __user *ptr = buf;
543 int len;
544
545 len = min_t(unsigned int, skb->len, count);
546
547 if (copy_to_user(ptr, skb->data, len))
548 return -EFAULT;
549
550 if (!data->hdev)
551 return len;
552
553 data->hdev->stat.byte_tx += len;
554
555 switch (hci_skb_pkt_type(skb)) {
556 case HCI_COMMAND_PKT:
557 data->hdev->stat.cmd_tx++;
558 break;
559 case HCI_ACLDATA_PKT:
560 data->hdev->stat.acl_tx++;
561 break;
562 case HCI_SCODATA_PKT:
563 data->hdev->stat.sco_tx++;
564 break;
565 }
566
567 return len;
568}
569
570static ssize_t vhci_read(struct file *file,
571 char __user *buf, size_t count, loff_t *pos)
572{
573 struct vhci_data *data = file->private_data;
574 struct sk_buff *skb;
575 ssize_t ret = 0;
576
577 while (count) {
578 skb = skb_dequeue(&data->readq);
579 if (skb) {
580 ret = vhci_put_user(data, skb, buf, count);
581 if (ret < 0)
582 skb_queue_head(&data->readq, skb);
583 else
584 kfree_skb(skb);
585 break;
586 }
587
588 if (file->f_flags & O_NONBLOCK) {
589 ret = -EAGAIN;
590 break;
591 }
592
593 ret = wait_event_interruptible(data->read_wait,
594 !skb_queue_empty(&data->readq));
595 if (ret < 0)
596 break;
597 }
598
599 return ret;
600}
601
602static ssize_t vhci_write(struct kiocb *iocb, struct iov_iter *from)
603{
604 struct file *file = iocb->ki_filp;
605 struct vhci_data *data = file->private_data;
606
607 return vhci_get_user(data, from);
608}
609
610static __poll_t vhci_poll(struct file *file, poll_table *wait)
611{
612 struct vhci_data *data = file->private_data;
613
614 poll_wait(file, &data->read_wait, wait);
615
616 if (!skb_queue_empty(&data->readq))
617 return EPOLLIN | EPOLLRDNORM;
618
619 return EPOLLOUT | EPOLLWRNORM;
620}
621
622static void vhci_open_timeout(struct work_struct *work)
623{
624 struct vhci_data *data = container_of(work, struct vhci_data,
625 open_timeout.work);
626
627 vhci_create_device(data, 0x00);
628}
629
630static int vhci_open(struct inode *inode, struct file *file)
631{
632 struct vhci_data *data;
633
634 data = kzalloc(sizeof(*data), GFP_KERNEL);
635 if (!data)
636 return -ENOMEM;
637
638 skb_queue_head_init(&data->readq);
639 init_waitqueue_head(&data->read_wait);
640
641 mutex_init(&data->open_mutex);
642 INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout);
643 INIT_WORK(&data->suspend_work, vhci_suspend_work);
644
645 file->private_data = data;
646 nonseekable_open(inode, file);
647
648 schedule_delayed_work(&data->open_timeout, msecs_to_jiffies(1000));
649
650 return 0;
651}
652
653static int vhci_release(struct inode *inode, struct file *file)
654{
655 struct vhci_data *data = file->private_data;
656 struct hci_dev *hdev;
657
658 cancel_delayed_work_sync(&data->open_timeout);
659 flush_work(&data->suspend_work);
660
661 hdev = data->hdev;
662
663 if (hdev) {
664 hci_unregister_dev(hdev);
665 hci_free_dev(hdev);
666 }
667
668 skb_queue_purge(&data->readq);
669 file->private_data = NULL;
670 kfree(data);
671
672 return 0;
673}
674
675static const struct file_operations vhci_fops = {
676 .owner = THIS_MODULE,
677 .read = vhci_read,
678 .write_iter = vhci_write,
679 .poll = vhci_poll,
680 .open = vhci_open,
681 .release = vhci_release,
682};
683
684static struct miscdevice vhci_miscdev = {
685 .name = "vhci",
686 .fops = &vhci_fops,
687 .minor = VHCI_MINOR,
688};
689module_misc_device(vhci_miscdev);
690
691module_param(amp, bool, 0644);
692MODULE_PARM_DESC(amp, "Create AMP controller device");
693
694MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
695MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
696MODULE_VERSION(VERSION);
697MODULE_LICENSE("GPL");
698MODULE_ALIAS("devname:vhci");
699MODULE_ALIAS_MISCDEV(VHCI_MINOR);
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
45static bool amp;
46
47struct 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
56static int vhci_open_dev(struct hci_dev *hdev)
57{
58 set_bit(HCI_RUNNING, &hdev->flags);
59
60 return 0;
61}
62
63static 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
75static 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
84static 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
98static 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
143static 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
217static 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
249static 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
281static 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
290static 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
302static 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
310static 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
331static 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
349static 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
359static struct miscdevice vhci_miscdev= {
360 .name = "vhci",
361 .fops = &vhci_fops,
362 .minor = VHCI_MINOR,
363};
364
365static int __init vhci_init(void)
366{
367 BT_INFO("Virtual HCI driver ver %s", VERSION);
368
369 return misc_register(&vhci_miscdev);
370}
371
372static void __exit vhci_exit(void)
373{
374 misc_deregister(&vhci_miscdev);
375}
376
377module_init(vhci_init);
378module_exit(vhci_exit);
379
380module_param(amp, bool, 0644);
381MODULE_PARM_DESC(amp, "Create AMP controller device");
382
383MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
384MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
385MODULE_VERSION(VERSION);
386MODULE_LICENSE("GPL");
387MODULE_ALIAS("devname:vhci");
388MODULE_ALIAS_MISCDEV(VHCI_MINOR);