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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
28#include <linux/kernel.h>
29#include <linux/init.h>
30#include <linux/slab.h>
31#include <linux/types.h>
32#include <linux/errno.h>
33#include <linux/sched.h>
34#include <linux/poll.h>
35
36#include <linux/skbuff.h>
37#include <linux/miscdevice.h>
38
39#include <net/bluetooth/bluetooth.h>
40#include <net/bluetooth/hci_core.h>
41
42#define VERSION "1.3"
43
44struct vhci_data {
45 struct hci_dev *hdev;
46
47 unsigned long flags;
48
49 wait_queue_head_t read_wait;
50 struct sk_buff_head readq;
51};
52
53static int vhci_open_dev(struct hci_dev *hdev)
54{
55 set_bit(HCI_RUNNING, &hdev->flags);
56
57 return 0;
58}
59
60static int vhci_close_dev(struct hci_dev *hdev)
61{
62 struct vhci_data *data = hdev->driver_data;
63
64 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
65 return 0;
66
67 skb_queue_purge(&data->readq);
68
69 return 0;
70}
71
72static int vhci_flush(struct hci_dev *hdev)
73{
74 struct vhci_data *data = hdev->driver_data;
75
76 skb_queue_purge(&data->readq);
77
78 return 0;
79}
80
81static int vhci_send_frame(struct sk_buff *skb)
82{
83 struct hci_dev* hdev = (struct hci_dev *) skb->dev;
84 struct vhci_data *data;
85
86 if (!hdev) {
87 BT_ERR("Frame for unknown HCI device (hdev=NULL)");
88 return -ENODEV;
89 }
90
91 if (!test_bit(HCI_RUNNING, &hdev->flags))
92 return -EBUSY;
93
94 data = hdev->driver_data;
95
96 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
97 skb_queue_tail(&data->readq, skb);
98
99 wake_up_interruptible(&data->read_wait);
100
101 return 0;
102}
103
104static void vhci_destruct(struct hci_dev *hdev)
105{
106 kfree(hdev->driver_data);
107}
108
109static inline ssize_t vhci_get_user(struct vhci_data *data,
110 const char __user *buf, size_t count)
111{
112 struct sk_buff *skb;
113
114 if (count > HCI_MAX_FRAME_SIZE)
115 return -EINVAL;
116
117 skb = bt_skb_alloc(count, GFP_KERNEL);
118 if (!skb)
119 return -ENOMEM;
120
121 if (copy_from_user(skb_put(skb, count), buf, count)) {
122 kfree_skb(skb);
123 return -EFAULT;
124 }
125
126 skb->dev = (void *) data->hdev;
127 bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
128 skb_pull(skb, 1);
129
130 hci_recv_frame(skb);
131
132 return count;
133}
134
135static inline ssize_t vhci_put_user(struct vhci_data *data,
136 struct sk_buff *skb, char __user *buf, int count)
137{
138 char __user *ptr = buf;
139 int len, total = 0;
140
141 len = min_t(unsigned int, skb->len, count);
142
143 if (copy_to_user(ptr, skb->data, len))
144 return -EFAULT;
145
146 total += len;
147
148 data->hdev->stat.byte_tx += len;
149
150 switch (bt_cb(skb)->pkt_type) {
151 case HCI_COMMAND_PKT:
152 data->hdev->stat.cmd_tx++;
153 break;
154
155 case HCI_ACLDATA_PKT:
156 data->hdev->stat.acl_tx++;
157 break;
158
159 case HCI_SCODATA_PKT:
160 data->hdev->stat.sco_tx++;
161 break;
162 };
163
164 return total;
165}
166
167static ssize_t vhci_read(struct file *file,
168 char __user *buf, size_t count, loff_t *pos)
169{
170 struct vhci_data *data = file->private_data;
171 struct sk_buff *skb;
172 ssize_t ret = 0;
173
174 while (count) {
175 skb = skb_dequeue(&data->readq);
176 if (skb) {
177 ret = vhci_put_user(data, skb, buf, count);
178 if (ret < 0)
179 skb_queue_head(&data->readq, skb);
180 else
181 kfree_skb(skb);
182 break;
183 }
184
185 if (file->f_flags & O_NONBLOCK) {
186 ret = -EAGAIN;
187 break;
188 }
189
190 ret = wait_event_interruptible(data->read_wait,
191 !skb_queue_empty(&data->readq));
192 if (ret < 0)
193 break;
194 }
195
196 return ret;
197}
198
199static ssize_t vhci_write(struct file *file,
200 const char __user *buf, size_t count, loff_t *pos)
201{
202 struct vhci_data *data = file->private_data;
203
204 return vhci_get_user(data, buf, count);
205}
206
207static unsigned int vhci_poll(struct file *file, poll_table *wait)
208{
209 struct vhci_data *data = file->private_data;
210
211 poll_wait(file, &data->read_wait, wait);
212
213 if (!skb_queue_empty(&data->readq))
214 return POLLIN | POLLRDNORM;
215
216 return POLLOUT | POLLWRNORM;
217}
218
219static int vhci_open(struct inode *inode, struct file *file)
220{
221 struct vhci_data *data;
222 struct hci_dev *hdev;
223
224 data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
225 if (!data)
226 return -ENOMEM;
227
228 skb_queue_head_init(&data->readq);
229 init_waitqueue_head(&data->read_wait);
230
231 hdev = hci_alloc_dev();
232 if (!hdev) {
233 kfree(data);
234 return -ENOMEM;
235 }
236
237 data->hdev = hdev;
238
239 hdev->bus = HCI_VIRTUAL;
240 hdev->driver_data = data;
241
242 hdev->open = vhci_open_dev;
243 hdev->close = vhci_close_dev;
244 hdev->flush = vhci_flush;
245 hdev->send = vhci_send_frame;
246 hdev->destruct = vhci_destruct;
247
248 hdev->owner = THIS_MODULE;
249
250 if (hci_register_dev(hdev) < 0) {
251 BT_ERR("Can't register HCI device");
252 kfree(data);
253 hci_free_dev(hdev);
254 return -EBUSY;
255 }
256
257 file->private_data = data;
258
259 return nonseekable_open(inode, file);
260}
261
262static int vhci_release(struct inode *inode, struct file *file)
263{
264 struct vhci_data *data = file->private_data;
265 struct hci_dev *hdev = data->hdev;
266
267 if (hci_unregister_dev(hdev) < 0) {
268 BT_ERR("Can't unregister HCI device %s", hdev->name);
269 }
270
271 hci_free_dev(hdev);
272
273 file->private_data = NULL;
274
275 return 0;
276}
277
278static const struct file_operations vhci_fops = {
279 .owner = THIS_MODULE,
280 .read = vhci_read,
281 .write = vhci_write,
282 .poll = vhci_poll,
283 .open = vhci_open,
284 .release = vhci_release,
285 .llseek = no_llseek,
286};
287
288static struct miscdevice vhci_miscdev= {
289 .name = "vhci",
290 .fops = &vhci_fops,
291 .minor = MISC_DYNAMIC_MINOR,
292};
293
294static int __init vhci_init(void)
295{
296 BT_INFO("Virtual HCI driver ver %s", VERSION);
297
298 return misc_register(&vhci_miscdev);
299}
300
301static void __exit vhci_exit(void)
302{
303 misc_deregister(&vhci_miscdev);
304}
305
306module_init(vhci_init);
307module_exit(vhci_exit);
308
309MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
310MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
311MODULE_VERSION(VERSION);
312MODULE_LICENSE("GPL");
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
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 __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(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(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
427
428 /* bit 6 is for external configuration */
429 if (opcode & 0x40)
430 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
431
432 /* bit 7 is for raw device */
433 if (opcode & 0x80)
434 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
435
436 set_bit(HCI_QUIRK_VALID_LE_STATES, &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("force_suspend", 0644, hdev->debugfs, data,
447 &force_suspend_fops);
448
449 debugfs_create_file("force_wakeup", 0644, hdev->debugfs, data,
450 &force_wakeup_fops);
451
452 if (IS_ENABLED(CONFIG_BT_MSFTEXT))
453 debugfs_create_file("msft_opcode", 0644, hdev->debugfs, data,
454 &msft_opcode_fops);
455
456 if (IS_ENABLED(CONFIG_BT_AOSPEXT))
457 debugfs_create_file("aosp_capable", 0644, hdev->debugfs, data,
458 &aosp_capable_fops);
459
460 debugfs_create_file("force_devcoredump", 0644, hdev->debugfs, data,
461 &force_devcoredump_fops);
462
463 hci_skb_pkt_type(skb) = HCI_VENDOR_PKT;
464
465 skb_put_u8(skb, 0xff);
466 skb_put_u8(skb, opcode);
467 put_unaligned_le16(hdev->id, skb_put(skb, 2));
468 skb_queue_head(&data->readq, skb);
469 atomic_inc(&data->initialized);
470
471 wake_up_interruptible(&data->read_wait);
472 return 0;
473}
474
475static 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(&data->open_mutex);
482
483 return err;
484}
485
486static inline ssize_t vhci_get_user(struct vhci_data *data,
487 struct iov_iter *from)
488{
489 size_t len = iov_iter_count(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(skb_put(skb, len), len, from)) {
502 kfree_skb(skb);
503 return -EFAULT;
504 }
505
506 pkt_type = *((__u8 *) skb->data);
507 skb_pull(skb, 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(data->hdev, skb);
522 break;
523
524 case HCI_VENDOR_PKT:
525 cancel_delayed_work_sync(&data->open_timeout);
526
527 opcode = *((__u8 *) skb->data);
528 skb_pull(skb, 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
548static 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(ptr, skb->data, 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
580static 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(&data->readq);
589 if (skb) {
590 ret = vhci_put_user(data, skb, buf, count);
591 if (ret < 0)
592 skb_queue_head(&data->readq, 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
612static 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
620static __poll_t vhci_poll(struct file *file, poll_table *wait)
621{
622 struct vhci_data *data = file->private_data;
623
624 poll_wait(file, &data->read_wait, wait);
625
626 if (!skb_queue_empty(&data->readq))
627 return EPOLLIN | EPOLLRDNORM;
628
629 return EPOLLOUT | EPOLLWRNORM;
630}
631
632static 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, amp ? HCI_AMP : HCI_PRIMARY);
638}
639
640static int vhci_open(struct inode *inode, struct file *file)
641{
642 struct vhci_data *data;
643
644 data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
645 if (!data)
646 return -ENOMEM;
647
648 skb_queue_head_init(&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, file);
657
658 schedule_delayed_work(&data->open_timeout, msecs_to_jiffies(1000));
659
660 return 0;
661}
662
663static 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(&data->open_timeout);
669 flush_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(&data->readq);
679 file->private_data = NULL;
680 kfree(data);
681
682 return 0;
683}
684
685static 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
695static struct miscdevice vhci_miscdev = {
696 .name = "vhci",
697 .fops = &vhci_fops,
698 .minor = VHCI_MINOR,
699};
700module_misc_device(vhci_miscdev);
701
702module_param(amp, bool, 0644);
703MODULE_PARM_DESC(amp, "Create AMP controller device");
704
705MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
706MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION);
707MODULE_VERSION(VERSION);
708MODULE_LICENSE("GPL");
709MODULE_ALIAS("devname:vhci");
710MODULE_ALIAS_MISCDEV(VHCI_MINOR);