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 12 static struct class *bt_class; 13 14 struct dentry *bt_debugfs; 15 EXPORT_SYMBOL_GPL(bt_debugfs); 16 17 static 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 31 static 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 37 static 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 43 static 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) \ 55 struct device_attribute link_attr_##_name = __ATTR(_name, _mode, _show, _store) 56 57 static LINK_ATTR(type, S_IRUGO, show_link_type, NULL); 58 static LINK_ATTR(address, S_IRUGO, show_link_address, NULL); 59 static LINK_ATTR(features, S_IRUGO, show_link_features, NULL); 60 61 static struct attribute *bt_link_attrs[] = { 62 &link_attr_type.attr, 63 &link_attr_address.attr, 64 &link_attr_features.attr, 65 NULL 66 }; 67 68 static struct attribute_group bt_link_group = { 69 .attrs = bt_link_attrs, 70 }; 71 72 static const struct attribute_group *bt_link_groups[] = { 73 &bt_link_group, 74 NULL 75 }; 76 77 static void bt_link_release(struct device *dev) 78 { 79 void *data = dev_get_drvdata(dev); 80 kfree(data); 81 } 82 83 static struct device_type bt_link = { 84 .name = "link", 85 .groups = bt_link_groups, 86 .release = bt_link_release, 87 }; 88 89 static 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 */ 111 static int __match_tty(struct device *dev, void *data) 112 { 113 return !strncmp(dev_name(dev), "rfcomm", 6); 114 } 115 116 static 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 } 139 140 void 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 } 155 156 void 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 } 162 163 void 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 } 169 170 static 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 } 191 192 static 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 } 203 204 static 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 } 209 210 static 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 } 215 216 static 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 } 228 229 static 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 } 235 236 static 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 } 241 242 static 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 } 252 253 static 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 } 258 259 static 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 } 264 265 static 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 } 270 271 static 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 } 276 277 static 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 } 294 295 static 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 } 300 301 static 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 } 318 319 static 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 } 324 325 static 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 } 342 343 static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL); 344 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL); 345 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 346 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL); 347 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL); 348 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL); 349 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL); 350 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL); 351 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL); 352 353 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR, 354 show_idle_timeout, store_idle_timeout); 355 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR, 356 show_sniff_max_interval, store_sniff_max_interval); 357 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR, 358 show_sniff_min_interval, store_sniff_min_interval); 359 360 static 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 }; 375 376 static struct attribute_group bt_host_group = { 377 .attrs = bt_host_attrs, 378 }; 379 380 static const struct attribute_group *bt_host_groups[] = { 381 &bt_host_group, 382 NULL 383 }; 384 385 static void bt_host_release(struct device *dev) 386 { 387 void *data = dev_get_drvdata(dev); 388 kfree(data); 389 } 390 391 static struct device_type bt_host = { 392 .name = "host", 393 .groups = bt_host_groups, 394 .release = bt_host_release, 395 }; 396 397 static 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 } 420 421 static int inquiry_cache_open(struct inode *inode, struct file *file) 422 { 423 return single_open(file, inquiry_cache_show, inode->i_private); 424 } 425 426 static 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 }; 432 433 static 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 } 452 453 static int blacklist_open(struct inode *inode, struct file *file) 454 { 455 return single_open(file, blacklist_show, inode->i_private); 456 } 457 458 static const struct file_operations blacklist_fops = { 459 .open = blacklist_open, 460 .read = seq_read, 461 .llseek = seq_lseek, 462 .release = single_release, 463 }; 464 465 static 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 } 481 482 static 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 } 501 502 static int uuids_open(struct inode *inode, struct file *file) 503 { 504 return single_open(file, uuids_show, inode->i_private); 505 } 506 507 static const struct file_operations uuids_fops = { 508 .open = uuids_open, 509 .read = seq_read, 510 .llseek = seq_lseek, 511 .release = single_release, 512 }; 513 514 static 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 } 526 527 static 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 } 539 540 DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get, 541 auto_accept_delay_set, "%llu\n"); 542 543 int 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 } 581 582 void 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 } 590 591 int __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 } 601 602 void bt_sysfs_cleanup(void) 603 { 604 class_destroy(bt_class); 605 606 debugfs_remove_recursive(bt_debugfs); 607 } 608