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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#include <linux/module.h>
9
10#include <net/bluetooth/bluetooth.h>
11#include <net/bluetooth/hci_core.h>
12
13static struct class *bt_class;
14
15struct dentry *bt_debugfs;
16EXPORT_SYMBOL_GPL(bt_debugfs);
17
18static inline char *link_typetostr(int type)
19{
20 switch (type) {
21 case ACL_LINK:
22 return "ACL";
23 case SCO_LINK:
24 return "SCO";
25 case ESCO_LINK:
26 return "eSCO";
27 case LE_LINK:
28 return "LE";
29 default:
30 return "UNKNOWN";
31 }
32}
33
34static ssize_t show_link_type(struct device *dev, struct device_attribute *attr, char *buf)
35{
36 struct hci_conn *conn = to_hci_conn(dev);
37 return sprintf(buf, "%s\n", link_typetostr(conn->type));
38}
39
40static ssize_t show_link_address(struct device *dev, struct device_attribute *attr, char *buf)
41{
42 struct hci_conn *conn = to_hci_conn(dev);
43 return sprintf(buf, "%s\n", batostr(&conn->dst));
44}
45
46static ssize_t show_link_features(struct device *dev, struct device_attribute *attr, char *buf)
47{
48 struct hci_conn *conn = to_hci_conn(dev);
49
50 return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
51 conn->features[0], conn->features[1],
52 conn->features[2], conn->features[3],
53 conn->features[4], conn->features[5],
54 conn->features[6], conn->features[7]);
55}
56
57#define LINK_ATTR(_name, _mode, _show, _store) \
58struct device_attribute link_attr_##_name = __ATTR(_name, _mode, _show, _store)
59
60static LINK_ATTR(type, S_IRUGO, show_link_type, NULL);
61static LINK_ATTR(address, S_IRUGO, show_link_address, NULL);
62static LINK_ATTR(features, S_IRUGO, show_link_features, NULL);
63
64static struct attribute *bt_link_attrs[] = {
65 &link_attr_type.attr,
66 &link_attr_address.attr,
67 &link_attr_features.attr,
68 NULL
69};
70
71static struct attribute_group bt_link_group = {
72 .attrs = bt_link_attrs,
73};
74
75static const struct attribute_group *bt_link_groups[] = {
76 &bt_link_group,
77 NULL
78};
79
80static void bt_link_release(struct device *dev)
81{
82 struct hci_conn *conn = to_hci_conn(dev);
83 kfree(conn);
84}
85
86static struct device_type bt_link = {
87 .name = "link",
88 .groups = bt_link_groups,
89 .release = bt_link_release,
90};
91
92/*
93 * The rfcomm tty device will possibly retain even when conn
94 * is down, and sysfs doesn't support move zombie device,
95 * so we should move the device before conn device is destroyed.
96 */
97static int __match_tty(struct device *dev, void *data)
98{
99 return !strncmp(dev_name(dev), "rfcomm", 6);
100}
101
102void hci_conn_init_sysfs(struct hci_conn *conn)
103{
104 struct hci_dev *hdev = conn->hdev;
105
106 BT_DBG("conn %p", conn);
107
108 conn->dev.type = &bt_link;
109 conn->dev.class = bt_class;
110 conn->dev.parent = &hdev->dev;
111
112 device_initialize(&conn->dev);
113}
114
115void hci_conn_add_sysfs(struct hci_conn *conn)
116{
117 struct hci_dev *hdev = conn->hdev;
118
119 BT_DBG("conn %p", conn);
120
121 dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
122
123 if (device_add(&conn->dev) < 0) {
124 BT_ERR("Failed to register connection device");
125 return;
126 }
127
128 hci_dev_hold(hdev);
129}
130
131void hci_conn_del_sysfs(struct hci_conn *conn)
132{
133 struct hci_dev *hdev = conn->hdev;
134
135 if (!device_is_registered(&conn->dev))
136 return;
137
138 while (1) {
139 struct device *dev;
140
141 dev = device_find_child(&conn->dev, NULL, __match_tty);
142 if (!dev)
143 break;
144 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
145 put_device(dev);
146 }
147
148 device_del(&conn->dev);
149 put_device(&conn->dev);
150
151 hci_dev_put(hdev);
152}
153
154static inline char *host_bustostr(int bus)
155{
156 switch (bus) {
157 case HCI_VIRTUAL:
158 return "VIRTUAL";
159 case HCI_USB:
160 return "USB";
161 case HCI_PCCARD:
162 return "PCCARD";
163 case HCI_UART:
164 return "UART";
165 case HCI_RS232:
166 return "RS232";
167 case HCI_PCI:
168 return "PCI";
169 case HCI_SDIO:
170 return "SDIO";
171 default:
172 return "UNKNOWN";
173 }
174}
175
176static inline char *host_typetostr(int type)
177{
178 switch (type) {
179 case HCI_BREDR:
180 return "BR/EDR";
181 case HCI_AMP:
182 return "AMP";
183 default:
184 return "UNKNOWN";
185 }
186}
187
188static ssize_t show_bus(struct device *dev, struct device_attribute *attr, char *buf)
189{
190 struct hci_dev *hdev = to_hci_dev(dev);
191 return sprintf(buf, "%s\n", host_bustostr(hdev->bus));
192}
193
194static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
195{
196 struct hci_dev *hdev = to_hci_dev(dev);
197 return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type));
198}
199
200static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
201{
202 struct hci_dev *hdev = to_hci_dev(dev);
203 char name[HCI_MAX_NAME_LENGTH + 1];
204 int i;
205
206 for (i = 0; i < HCI_MAX_NAME_LENGTH; i++)
207 name[i] = hdev->dev_name[i];
208
209 name[HCI_MAX_NAME_LENGTH] = '\0';
210 return sprintf(buf, "%s\n", name);
211}
212
213static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
214{
215 struct hci_dev *hdev = to_hci_dev(dev);
216 return sprintf(buf, "0x%.2x%.2x%.2x\n",
217 hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
218}
219
220static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
221{
222 struct hci_dev *hdev = to_hci_dev(dev);
223 return sprintf(buf, "%s\n", batostr(&hdev->bdaddr));
224}
225
226static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
227{
228 struct hci_dev *hdev = to_hci_dev(dev);
229
230 return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
231 hdev->features[0], hdev->features[1],
232 hdev->features[2], hdev->features[3],
233 hdev->features[4], hdev->features[5],
234 hdev->features[6], hdev->features[7]);
235}
236
237static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
238{
239 struct hci_dev *hdev = to_hci_dev(dev);
240 return sprintf(buf, "%d\n", hdev->manufacturer);
241}
242
243static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
244{
245 struct hci_dev *hdev = to_hci_dev(dev);
246 return sprintf(buf, "%d\n", hdev->hci_ver);
247}
248
249static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
250{
251 struct hci_dev *hdev = to_hci_dev(dev);
252 return sprintf(buf, "%d\n", hdev->hci_rev);
253}
254
255static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
256{
257 struct hci_dev *hdev = to_hci_dev(dev);
258 return sprintf(buf, "%d\n", hdev->idle_timeout);
259}
260
261static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
262{
263 struct hci_dev *hdev = to_hci_dev(dev);
264 unsigned int val;
265 int rv;
266
267 rv = kstrtouint(buf, 0, &val);
268 if (rv < 0)
269 return rv;
270
271 if (val != 0 && (val < 500 || val > 3600000))
272 return -EINVAL;
273
274 hdev->idle_timeout = val;
275
276 return count;
277}
278
279static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
280{
281 struct hci_dev *hdev = to_hci_dev(dev);
282 return sprintf(buf, "%d\n", hdev->sniff_max_interval);
283}
284
285static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
286{
287 struct hci_dev *hdev = to_hci_dev(dev);
288 u16 val;
289 int rv;
290
291 rv = kstrtou16(buf, 0, &val);
292 if (rv < 0)
293 return rv;
294
295 if (val == 0 || val % 2 || val < hdev->sniff_min_interval)
296 return -EINVAL;
297
298 hdev->sniff_max_interval = val;
299
300 return count;
301}
302
303static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
304{
305 struct hci_dev *hdev = to_hci_dev(dev);
306 return sprintf(buf, "%d\n", hdev->sniff_min_interval);
307}
308
309static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
310{
311 struct hci_dev *hdev = to_hci_dev(dev);
312 u16 val;
313 int rv;
314
315 rv = kstrtou16(buf, 0, &val);
316 if (rv < 0)
317 return rv;
318
319 if (val == 0 || val % 2 || val > hdev->sniff_max_interval)
320 return -EINVAL;
321
322 hdev->sniff_min_interval = val;
323
324 return count;
325}
326
327static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL);
328static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
329static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
330static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
331static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
332static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
333static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
334static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
335static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
336
337static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
338 show_idle_timeout, store_idle_timeout);
339static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
340 show_sniff_max_interval, store_sniff_max_interval);
341static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
342 show_sniff_min_interval, store_sniff_min_interval);
343
344static struct attribute *bt_host_attrs[] = {
345 &dev_attr_bus.attr,
346 &dev_attr_type.attr,
347 &dev_attr_name.attr,
348 &dev_attr_class.attr,
349 &dev_attr_address.attr,
350 &dev_attr_features.attr,
351 &dev_attr_manufacturer.attr,
352 &dev_attr_hci_version.attr,
353 &dev_attr_hci_revision.attr,
354 &dev_attr_idle_timeout.attr,
355 &dev_attr_sniff_max_interval.attr,
356 &dev_attr_sniff_min_interval.attr,
357 NULL
358};
359
360static struct attribute_group bt_host_group = {
361 .attrs = bt_host_attrs,
362};
363
364static const struct attribute_group *bt_host_groups[] = {
365 &bt_host_group,
366 NULL
367};
368
369static void bt_host_release(struct device *dev)
370{
371 struct hci_dev *hdev = to_hci_dev(dev);
372 kfree(hdev);
373 module_put(THIS_MODULE);
374}
375
376static struct device_type bt_host = {
377 .name = "host",
378 .groups = bt_host_groups,
379 .release = bt_host_release,
380};
381
382static int inquiry_cache_show(struct seq_file *f, void *p)
383{
384 struct hci_dev *hdev = f->private;
385 struct discovery_state *cache = &hdev->discovery;
386 struct inquiry_entry *e;
387
388 hci_dev_lock(hdev);
389
390 list_for_each_entry(e, &cache->all, all) {
391 struct inquiry_data *data = &e->data;
392 seq_printf(f, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
393 batostr(&data->bdaddr),
394 data->pscan_rep_mode, data->pscan_period_mode,
395 data->pscan_mode, data->dev_class[2],
396 data->dev_class[1], data->dev_class[0],
397 __le16_to_cpu(data->clock_offset),
398 data->rssi, data->ssp_mode, e->timestamp);
399 }
400
401 hci_dev_unlock(hdev);
402
403 return 0;
404}
405
406static int inquiry_cache_open(struct inode *inode, struct file *file)
407{
408 return single_open(file, inquiry_cache_show, inode->i_private);
409}
410
411static const struct file_operations inquiry_cache_fops = {
412 .open = inquiry_cache_open,
413 .read = seq_read,
414 .llseek = seq_lseek,
415 .release = single_release,
416};
417
418static int blacklist_show(struct seq_file *f, void *p)
419{
420 struct hci_dev *hdev = f->private;
421 struct bdaddr_list *b;
422
423 hci_dev_lock(hdev);
424
425 list_for_each_entry(b, &hdev->blacklist, list)
426 seq_printf(f, "%s\n", batostr(&b->bdaddr));
427
428 hci_dev_unlock(hdev);
429
430 return 0;
431}
432
433static int blacklist_open(struct inode *inode, struct file *file)
434{
435 return single_open(file, blacklist_show, inode->i_private);
436}
437
438static const struct file_operations blacklist_fops = {
439 .open = blacklist_open,
440 .read = seq_read,
441 .llseek = seq_lseek,
442 .release = single_release,
443};
444
445static void print_bt_uuid(struct seq_file *f, u8 *uuid)
446{
447 __be32 data0, data4;
448 __be16 data1, data2, data3, data5;
449
450 memcpy(&data0, &uuid[0], 4);
451 memcpy(&data1, &uuid[4], 2);
452 memcpy(&data2, &uuid[6], 2);
453 memcpy(&data3, &uuid[8], 2);
454 memcpy(&data4, &uuid[10], 4);
455 memcpy(&data5, &uuid[14], 2);
456
457 seq_printf(f, "%.8x-%.4x-%.4x-%.4x-%.8x%.4x\n",
458 ntohl(data0), ntohs(data1), ntohs(data2),
459 ntohs(data3), ntohl(data4), ntohs(data5));
460}
461
462static int uuids_show(struct seq_file *f, void *p)
463{
464 struct hci_dev *hdev = f->private;
465 struct bt_uuid *uuid;
466
467 hci_dev_lock(hdev);
468
469 list_for_each_entry(uuid, &hdev->uuids, list)
470 print_bt_uuid(f, uuid->uuid);
471
472 hci_dev_unlock(hdev);
473
474 return 0;
475}
476
477static int uuids_open(struct inode *inode, struct file *file)
478{
479 return single_open(file, uuids_show, inode->i_private);
480}
481
482static const struct file_operations uuids_fops = {
483 .open = uuids_open,
484 .read = seq_read,
485 .llseek = seq_lseek,
486 .release = single_release,
487};
488
489static int auto_accept_delay_set(void *data, u64 val)
490{
491 struct hci_dev *hdev = data;
492
493 hci_dev_lock(hdev);
494
495 hdev->auto_accept_delay = val;
496
497 hci_dev_unlock(hdev);
498
499 return 0;
500}
501
502static int auto_accept_delay_get(void *data, u64 *val)
503{
504 struct hci_dev *hdev = data;
505
506 hci_dev_lock(hdev);
507
508 *val = hdev->auto_accept_delay;
509
510 hci_dev_unlock(hdev);
511
512 return 0;
513}
514
515DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get,
516 auto_accept_delay_set, "%llu\n");
517
518void hci_init_sysfs(struct hci_dev *hdev)
519{
520 struct device *dev = &hdev->dev;
521
522 dev->type = &bt_host;
523 dev->class = bt_class;
524
525 __module_get(THIS_MODULE);
526 device_initialize(dev);
527}
528
529int hci_add_sysfs(struct hci_dev *hdev)
530{
531 struct device *dev = &hdev->dev;
532 int err;
533
534 BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
535
536 dev_set_name(dev, "%s", hdev->name);
537
538 err = device_add(dev);
539 if (err < 0)
540 return err;
541
542 if (!bt_debugfs)
543 return 0;
544
545 hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
546 if (!hdev->debugfs)
547 return 0;
548
549 debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
550 hdev, &inquiry_cache_fops);
551
552 debugfs_create_file("blacklist", 0444, hdev->debugfs,
553 hdev, &blacklist_fops);
554
555 debugfs_create_file("uuids", 0444, hdev->debugfs, hdev, &uuids_fops);
556
557 debugfs_create_file("auto_accept_delay", 0444, hdev->debugfs, hdev,
558 &auto_accept_delay_fops);
559 return 0;
560}
561
562void hci_del_sysfs(struct hci_dev *hdev)
563{
564 BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
565
566 debugfs_remove_recursive(hdev->debugfs);
567
568 device_del(&hdev->dev);
569}
570
571int __init bt_sysfs_init(void)
572{
573 bt_debugfs = debugfs_create_dir("bluetooth", NULL);
574
575 bt_class = class_create(THIS_MODULE, "bluetooth");
576 if (IS_ERR(bt_class))
577 return PTR_ERR(bt_class);
578
579 return 0;
580}
581
582void bt_sysfs_cleanup(void)
583{
584 class_destroy(bt_class);
585
586 debugfs_remove_recursive(bt_debugfs);
587}