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1// SPDX-License-Identifier: GPL-2.0
2/* Bluetooth HCI driver model support. */
3
4#include <linux/module.h>
5
6#include <net/bluetooth/bluetooth.h>
7#include <net/bluetooth/hci_core.h>
8
9static const struct class bt_class = {
10 .name = "bluetooth",
11};
12
13static void bt_link_release(struct device *dev)
14{
15 struct hci_conn *conn = to_hci_conn(dev);
16 kfree(conn);
17}
18
19static const struct device_type bt_link = {
20 .name = "link",
21 .release = bt_link_release,
22};
23
24/*
25 * The rfcomm tty device will possibly retain even when conn
26 * is down, and sysfs doesn't support move zombie device,
27 * so we should move the device before conn device is destroyed.
28 */
29static int __match_tty(struct device *dev, void *data)
30{
31 return !strncmp(dev_name(dev), "rfcomm", 6);
32}
33
34void hci_conn_init_sysfs(struct hci_conn *conn)
35{
36 struct hci_dev *hdev = conn->hdev;
37
38 bt_dev_dbg(hdev, "conn %p", conn);
39
40 conn->dev.type = &bt_link;
41 conn->dev.class = &bt_class;
42 conn->dev.parent = &hdev->dev;
43
44 device_initialize(&conn->dev);
45}
46
47void hci_conn_add_sysfs(struct hci_conn *conn)
48{
49 struct hci_dev *hdev = conn->hdev;
50
51 bt_dev_dbg(hdev, "conn %p", conn);
52
53 if (device_is_registered(&conn->dev))
54 return;
55
56 dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
57
58 if (device_add(&conn->dev) < 0)
59 bt_dev_err(hdev, "failed to register connection device");
60}
61
62void hci_conn_del_sysfs(struct hci_conn *conn)
63{
64 struct hci_dev *hdev = conn->hdev;
65
66 bt_dev_dbg(hdev, "conn %p", conn);
67
68 if (!device_is_registered(&conn->dev)) {
69 /* If device_add() has *not* succeeded, use *only* put_device()
70 * to drop the reference count.
71 */
72 put_device(&conn->dev);
73 return;
74 }
75
76 while (1) {
77 struct device *dev;
78
79 dev = device_find_child(&conn->dev, NULL, __match_tty);
80 if (!dev)
81 break;
82 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
83 put_device(dev);
84 }
85
86 device_unregister(&conn->dev);
87}
88
89static void bt_host_release(struct device *dev)
90{
91 struct hci_dev *hdev = to_hci_dev(dev);
92
93 if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
94 hci_release_dev(hdev);
95 else
96 kfree(hdev);
97 module_put(THIS_MODULE);
98}
99
100static const struct device_type bt_host = {
101 .name = "host",
102 .release = bt_host_release,
103};
104
105void hci_init_sysfs(struct hci_dev *hdev)
106{
107 struct device *dev = &hdev->dev;
108
109 dev->type = &bt_host;
110 dev->class = &bt_class;
111
112 __module_get(THIS_MODULE);
113 device_initialize(dev);
114}
115
116int __init bt_sysfs_init(void)
117{
118 return class_register(&bt_class);
119}
120
121void bt_sysfs_cleanup(void)
122{
123 class_unregister(&bt_class);
124}
1/* Bluetooth HCI driver model support. */
2
3#include <linux/kernel.h>
4#include <linux/slab.h>
5#include <linux/init.h>
6#include <linux/debugfs.h>
7#include <linux/seq_file.h>
8
9#include <net/bluetooth/bluetooth.h>
10#include <net/bluetooth/hci_core.h>
11
12static struct class *bt_class;
13
14struct dentry *bt_debugfs;
15EXPORT_SYMBOL_GPL(bt_debugfs);
16
17static inline char *link_typetostr(int type)
18{
19 switch (type) {
20 case ACL_LINK:
21 return "ACL";
22 case SCO_LINK:
23 return "SCO";
24 case ESCO_LINK:
25 return "eSCO";
26 default:
27 return "UNKNOWN";
28 }
29}
30
31static ssize_t show_link_type(struct device *dev, struct device_attribute *attr, char *buf)
32{
33 struct hci_conn *conn = dev_get_drvdata(dev);
34 return sprintf(buf, "%s\n", link_typetostr(conn->type));
35}
36
37static ssize_t show_link_address(struct device *dev, struct device_attribute *attr, char *buf)
38{
39 struct hci_conn *conn = dev_get_drvdata(dev);
40 return sprintf(buf, "%s\n", batostr(&conn->dst));
41}
42
43static ssize_t show_link_features(struct device *dev, struct device_attribute *attr, char *buf)
44{
45 struct hci_conn *conn = dev_get_drvdata(dev);
46
47 return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
48 conn->features[0], conn->features[1],
49 conn->features[2], conn->features[3],
50 conn->features[4], conn->features[5],
51 conn->features[6], conn->features[7]);
52}
53
54#define LINK_ATTR(_name, _mode, _show, _store) \
55struct device_attribute link_attr_##_name = __ATTR(_name, _mode, _show, _store)
56
57static LINK_ATTR(type, S_IRUGO, show_link_type, NULL);
58static LINK_ATTR(address, S_IRUGO, show_link_address, NULL);
59static LINK_ATTR(features, S_IRUGO, show_link_features, NULL);
60
61static struct attribute *bt_link_attrs[] = {
62 &link_attr_type.attr,
63 &link_attr_address.attr,
64 &link_attr_features.attr,
65 NULL
66};
67
68static struct attribute_group bt_link_group = {
69 .attrs = bt_link_attrs,
70};
71
72static const struct attribute_group *bt_link_groups[] = {
73 &bt_link_group,
74 NULL
75};
76
77static void bt_link_release(struct device *dev)
78{
79 void *data = dev_get_drvdata(dev);
80 kfree(data);
81}
82
83static struct device_type bt_link = {
84 .name = "link",
85 .groups = bt_link_groups,
86 .release = bt_link_release,
87};
88
89static void add_conn(struct work_struct *work)
90{
91 struct hci_conn *conn = container_of(work, struct hci_conn, work_add);
92 struct hci_dev *hdev = conn->hdev;
93
94 dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
95
96 dev_set_drvdata(&conn->dev, conn);
97
98 if (device_add(&conn->dev) < 0) {
99 BT_ERR("Failed to register connection device");
100 return;
101 }
102
103 hci_dev_hold(hdev);
104}
105
106/*
107 * The rfcomm tty device will possibly retain even when conn
108 * is down, and sysfs doesn't support move zombie device,
109 * so we should move the device before conn device is destroyed.
110 */
111static int __match_tty(struct device *dev, void *data)
112{
113 return !strncmp(dev_name(dev), "rfcomm", 6);
114}
115
116static void del_conn(struct work_struct *work)
117{
118 struct hci_conn *conn = container_of(work, struct hci_conn, work_del);
119 struct hci_dev *hdev = conn->hdev;
120
121 if (!device_is_registered(&conn->dev))
122 return;
123
124 while (1) {
125 struct device *dev;
126
127 dev = device_find_child(&conn->dev, NULL, __match_tty);
128 if (!dev)
129 break;
130 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
131 put_device(dev);
132 }
133
134 device_del(&conn->dev);
135 put_device(&conn->dev);
136
137 hci_dev_put(hdev);
138}
139
140void hci_conn_init_sysfs(struct hci_conn *conn)
141{
142 struct hci_dev *hdev = conn->hdev;
143
144 BT_DBG("conn %p", conn);
145
146 conn->dev.type = &bt_link;
147 conn->dev.class = bt_class;
148 conn->dev.parent = &hdev->dev;
149
150 device_initialize(&conn->dev);
151
152 INIT_WORK(&conn->work_add, add_conn);
153 INIT_WORK(&conn->work_del, del_conn);
154}
155
156void hci_conn_add_sysfs(struct hci_conn *conn)
157{
158 BT_DBG("conn %p", conn);
159
160 queue_work(conn->hdev->workqueue, &conn->work_add);
161}
162
163void hci_conn_del_sysfs(struct hci_conn *conn)
164{
165 BT_DBG("conn %p", conn);
166
167 queue_work(conn->hdev->workqueue, &conn->work_del);
168}
169
170static inline char *host_bustostr(int bus)
171{
172 switch (bus) {
173 case HCI_VIRTUAL:
174 return "VIRTUAL";
175 case HCI_USB:
176 return "USB";
177 case HCI_PCCARD:
178 return "PCCARD";
179 case HCI_UART:
180 return "UART";
181 case HCI_RS232:
182 return "RS232";
183 case HCI_PCI:
184 return "PCI";
185 case HCI_SDIO:
186 return "SDIO";
187 default:
188 return "UNKNOWN";
189 }
190}
191
192static inline char *host_typetostr(int type)
193{
194 switch (type) {
195 case HCI_BREDR:
196 return "BR/EDR";
197 case HCI_AMP:
198 return "AMP";
199 default:
200 return "UNKNOWN";
201 }
202}
203
204static ssize_t show_bus(struct device *dev, struct device_attribute *attr, char *buf)
205{
206 struct hci_dev *hdev = dev_get_drvdata(dev);
207 return sprintf(buf, "%s\n", host_bustostr(hdev->bus));
208}
209
210static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
211{
212 struct hci_dev *hdev = dev_get_drvdata(dev);
213 return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type));
214}
215
216static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
217{
218 struct hci_dev *hdev = dev_get_drvdata(dev);
219 char name[HCI_MAX_NAME_LENGTH + 1];
220 int i;
221
222 for (i = 0; i < HCI_MAX_NAME_LENGTH; i++)
223 name[i] = hdev->dev_name[i];
224
225 name[HCI_MAX_NAME_LENGTH] = '\0';
226 return sprintf(buf, "%s\n", name);
227}
228
229static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
230{
231 struct hci_dev *hdev = dev_get_drvdata(dev);
232 return sprintf(buf, "0x%.2x%.2x%.2x\n",
233 hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
234}
235
236static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
237{
238 struct hci_dev *hdev = dev_get_drvdata(dev);
239 return sprintf(buf, "%s\n", batostr(&hdev->bdaddr));
240}
241
242static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
243{
244 struct hci_dev *hdev = dev_get_drvdata(dev);
245
246 return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
247 hdev->features[0], hdev->features[1],
248 hdev->features[2], hdev->features[3],
249 hdev->features[4], hdev->features[5],
250 hdev->features[6], hdev->features[7]);
251}
252
253static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
254{
255 struct hci_dev *hdev = dev_get_drvdata(dev);
256 return sprintf(buf, "%d\n", hdev->manufacturer);
257}
258
259static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
260{
261 struct hci_dev *hdev = dev_get_drvdata(dev);
262 return sprintf(buf, "%d\n", hdev->hci_ver);
263}
264
265static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
266{
267 struct hci_dev *hdev = dev_get_drvdata(dev);
268 return sprintf(buf, "%d\n", hdev->hci_rev);
269}
270
271static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
272{
273 struct hci_dev *hdev = dev_get_drvdata(dev);
274 return sprintf(buf, "%d\n", hdev->idle_timeout);
275}
276
277static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
278{
279 struct hci_dev *hdev = dev_get_drvdata(dev);
280 unsigned int val;
281 int rv;
282
283 rv = kstrtouint(buf, 0, &val);
284 if (rv < 0)
285 return rv;
286
287 if (val != 0 && (val < 500 || val > 3600000))
288 return -EINVAL;
289
290 hdev->idle_timeout = val;
291
292 return count;
293}
294
295static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
296{
297 struct hci_dev *hdev = dev_get_drvdata(dev);
298 return sprintf(buf, "%d\n", hdev->sniff_max_interval);
299}
300
301static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
302{
303 struct hci_dev *hdev = dev_get_drvdata(dev);
304 u16 val;
305 int rv;
306
307 rv = kstrtou16(buf, 0, &val);
308 if (rv < 0)
309 return rv;
310
311 if (val == 0 || val % 2 || val < hdev->sniff_min_interval)
312 return -EINVAL;
313
314 hdev->sniff_max_interval = val;
315
316 return count;
317}
318
319static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
320{
321 struct hci_dev *hdev = dev_get_drvdata(dev);
322 return sprintf(buf, "%d\n", hdev->sniff_min_interval);
323}
324
325static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
326{
327 struct hci_dev *hdev = dev_get_drvdata(dev);
328 u16 val;
329 int rv;
330
331 rv = kstrtou16(buf, 0, &val);
332 if (rv < 0)
333 return rv;
334
335 if (val == 0 || val % 2 || val > hdev->sniff_max_interval)
336 return -EINVAL;
337
338 hdev->sniff_min_interval = val;
339
340 return count;
341}
342
343static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL);
344static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
345static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
346static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
347static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
348static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
349static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
350static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
351static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
352
353static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
354 show_idle_timeout, store_idle_timeout);
355static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
356 show_sniff_max_interval, store_sniff_max_interval);
357static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
358 show_sniff_min_interval, store_sniff_min_interval);
359
360static struct attribute *bt_host_attrs[] = {
361 &dev_attr_bus.attr,
362 &dev_attr_type.attr,
363 &dev_attr_name.attr,
364 &dev_attr_class.attr,
365 &dev_attr_address.attr,
366 &dev_attr_features.attr,
367 &dev_attr_manufacturer.attr,
368 &dev_attr_hci_version.attr,
369 &dev_attr_hci_revision.attr,
370 &dev_attr_idle_timeout.attr,
371 &dev_attr_sniff_max_interval.attr,
372 &dev_attr_sniff_min_interval.attr,
373 NULL
374};
375
376static struct attribute_group bt_host_group = {
377 .attrs = bt_host_attrs,
378};
379
380static const struct attribute_group *bt_host_groups[] = {
381 &bt_host_group,
382 NULL
383};
384
385static void bt_host_release(struct device *dev)
386{
387 void *data = dev_get_drvdata(dev);
388 kfree(data);
389}
390
391static struct device_type bt_host = {
392 .name = "host",
393 .groups = bt_host_groups,
394 .release = bt_host_release,
395};
396
397static int inquiry_cache_show(struct seq_file *f, void *p)
398{
399 struct hci_dev *hdev = f->private;
400 struct inquiry_cache *cache = &hdev->inq_cache;
401 struct inquiry_entry *e;
402
403 hci_dev_lock_bh(hdev);
404
405 for (e = cache->list; e; e = e->next) {
406 struct inquiry_data *data = &e->data;
407 seq_printf(f, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
408 batostr(&data->bdaddr),
409 data->pscan_rep_mode, data->pscan_period_mode,
410 data->pscan_mode, data->dev_class[2],
411 data->dev_class[1], data->dev_class[0],
412 __le16_to_cpu(data->clock_offset),
413 data->rssi, data->ssp_mode, e->timestamp);
414 }
415
416 hci_dev_unlock_bh(hdev);
417
418 return 0;
419}
420
421static int inquiry_cache_open(struct inode *inode, struct file *file)
422{
423 return single_open(file, inquiry_cache_show, inode->i_private);
424}
425
426static const struct file_operations inquiry_cache_fops = {
427 .open = inquiry_cache_open,
428 .read = seq_read,
429 .llseek = seq_lseek,
430 .release = single_release,
431};
432
433static int blacklist_show(struct seq_file *f, void *p)
434{
435 struct hci_dev *hdev = f->private;
436 struct list_head *l;
437
438 hci_dev_lock_bh(hdev);
439
440 list_for_each(l, &hdev->blacklist) {
441 struct bdaddr_list *b;
442
443 b = list_entry(l, struct bdaddr_list, list);
444
445 seq_printf(f, "%s\n", batostr(&b->bdaddr));
446 }
447
448 hci_dev_unlock_bh(hdev);
449
450 return 0;
451}
452
453static int blacklist_open(struct inode *inode, struct file *file)
454{
455 return single_open(file, blacklist_show, inode->i_private);
456}
457
458static const struct file_operations blacklist_fops = {
459 .open = blacklist_open,
460 .read = seq_read,
461 .llseek = seq_lseek,
462 .release = single_release,
463};
464
465static void print_bt_uuid(struct seq_file *f, u8 *uuid)
466{
467 u32 data0, data4;
468 u16 data1, data2, data3, data5;
469
470 memcpy(&data0, &uuid[0], 4);
471 memcpy(&data1, &uuid[4], 2);
472 memcpy(&data2, &uuid[6], 2);
473 memcpy(&data3, &uuid[8], 2);
474 memcpy(&data4, &uuid[10], 4);
475 memcpy(&data5, &uuid[14], 2);
476
477 seq_printf(f, "%.8x-%.4x-%.4x-%.4x-%.8x%.4x\n",
478 ntohl(data0), ntohs(data1), ntohs(data2),
479 ntohs(data3), ntohl(data4), ntohs(data5));
480}
481
482static int uuids_show(struct seq_file *f, void *p)
483{
484 struct hci_dev *hdev = f->private;
485 struct list_head *l;
486
487 hci_dev_lock_bh(hdev);
488
489 list_for_each(l, &hdev->uuids) {
490 struct bt_uuid *uuid;
491
492 uuid = list_entry(l, struct bt_uuid, list);
493
494 print_bt_uuid(f, uuid->uuid);
495 }
496
497 hci_dev_unlock_bh(hdev);
498
499 return 0;
500}
501
502static int uuids_open(struct inode *inode, struct file *file)
503{
504 return single_open(file, uuids_show, inode->i_private);
505}
506
507static const struct file_operations uuids_fops = {
508 .open = uuids_open,
509 .read = seq_read,
510 .llseek = seq_lseek,
511 .release = single_release,
512};
513
514static int auto_accept_delay_set(void *data, u64 val)
515{
516 struct hci_dev *hdev = data;
517
518 hci_dev_lock_bh(hdev);
519
520 hdev->auto_accept_delay = val;
521
522 hci_dev_unlock_bh(hdev);
523
524 return 0;
525}
526
527static int auto_accept_delay_get(void *data, u64 *val)
528{
529 struct hci_dev *hdev = data;
530
531 hci_dev_lock_bh(hdev);
532
533 *val = hdev->auto_accept_delay;
534
535 hci_dev_unlock_bh(hdev);
536
537 return 0;
538}
539
540DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get,
541 auto_accept_delay_set, "%llu\n");
542
543int hci_register_sysfs(struct hci_dev *hdev)
544{
545 struct device *dev = &hdev->dev;
546 int err;
547
548 BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
549
550 dev->type = &bt_host;
551 dev->class = bt_class;
552 dev->parent = hdev->parent;
553
554 dev_set_name(dev, "%s", hdev->name);
555
556 dev_set_drvdata(dev, hdev);
557
558 err = device_register(dev);
559 if (err < 0)
560 return err;
561
562 if (!bt_debugfs)
563 return 0;
564
565 hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
566 if (!hdev->debugfs)
567 return 0;
568
569 debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
570 hdev, &inquiry_cache_fops);
571
572 debugfs_create_file("blacklist", 0444, hdev->debugfs,
573 hdev, &blacklist_fops);
574
575 debugfs_create_file("uuids", 0444, hdev->debugfs, hdev, &uuids_fops);
576
577 debugfs_create_file("auto_accept_delay", 0444, hdev->debugfs, hdev,
578 &auto_accept_delay_fops);
579 return 0;
580}
581
582void hci_unregister_sysfs(struct hci_dev *hdev)
583{
584 BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
585
586 debugfs_remove_recursive(hdev->debugfs);
587
588 device_del(&hdev->dev);
589}
590
591int __init bt_sysfs_init(void)
592{
593 bt_debugfs = debugfs_create_dir("bluetooth", NULL);
594
595 bt_class = class_create(THIS_MODULE, "bluetooth");
596 if (IS_ERR(bt_class))
597 return PTR_ERR(bt_class);
598
599 return 0;
600}
601
602void bt_sysfs_cleanup(void)
603{
604 class_destroy(bt_class);
605
606 debugfs_remove_recursive(bt_debugfs);
607}