hci_sysfs.c revision b80f021f706f3578a1e80069c8e0f73b9a0ca6a7
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, 35 struct device_attribute *attr, char *buf) 36{ 37 struct hci_conn *conn = to_hci_conn(dev); 38 return sprintf(buf, "%s\n", link_typetostr(conn->type)); 39} 40 41static ssize_t show_link_address(struct device *dev, 42 struct device_attribute *attr, char *buf) 43{ 44 struct hci_conn *conn = to_hci_conn(dev); 45 return sprintf(buf, "%s\n", batostr(&conn->dst)); 46} 47 48static ssize_t show_link_features(struct device *dev, 49 struct device_attribute *attr, char *buf) 50{ 51 struct hci_conn *conn = to_hci_conn(dev); 52 53 return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n", 54 conn->features[0], conn->features[1], 55 conn->features[2], conn->features[3], 56 conn->features[4], conn->features[5], 57 conn->features[6], conn->features[7]); 58} 59 60#define LINK_ATTR(_name, _mode, _show, _store) \ 61struct device_attribute link_attr_##_name = __ATTR(_name, _mode, _show, _store) 62 63static LINK_ATTR(type, S_IRUGO, show_link_type, NULL); 64static LINK_ATTR(address, S_IRUGO, show_link_address, NULL); 65static LINK_ATTR(features, S_IRUGO, show_link_features, NULL); 66 67static struct attribute *bt_link_attrs[] = { 68 &link_attr_type.attr, 69 &link_attr_address.attr, 70 &link_attr_features.attr, 71 NULL 72}; 73 74static struct attribute_group bt_link_group = { 75 .attrs = bt_link_attrs, 76}; 77 78static const struct attribute_group *bt_link_groups[] = { 79 &bt_link_group, 80 NULL 81}; 82 83static void bt_link_release(struct device *dev) 84{ 85 struct hci_conn *conn = to_hci_conn(dev); 86 kfree(conn); 87} 88 89static struct device_type bt_link = { 90 .name = "link", 91 .groups = bt_link_groups, 92 .release = bt_link_release, 93}; 94 95/* 96 * The rfcomm tty device will possibly retain even when conn 97 * is down, and sysfs doesn't support move zombie device, 98 * so we should move the device before conn device is destroyed. 99 */ 100static int __match_tty(struct device *dev, void *data) 101{ 102 return !strncmp(dev_name(dev), "rfcomm", 6); 103} 104 105void hci_conn_init_sysfs(struct hci_conn *conn) 106{ 107 struct hci_dev *hdev = conn->hdev; 108 109 BT_DBG("conn %p", conn); 110 111 conn->dev.type = &bt_link; 112 conn->dev.class = bt_class; 113 conn->dev.parent = &hdev->dev; 114 115 device_initialize(&conn->dev); 116} 117 118void hci_conn_add_sysfs(struct hci_conn *conn) 119{ 120 struct hci_dev *hdev = conn->hdev; 121 122 BT_DBG("conn %p", conn); 123 124 dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle); 125 126 if (device_add(&conn->dev) < 0) { 127 BT_ERR("Failed to register connection device"); 128 return; 129 } 130 131 hci_dev_hold(hdev); 132} 133 134void hci_conn_del_sysfs(struct hci_conn *conn) 135{ 136 struct hci_dev *hdev = conn->hdev; 137 138 if (!device_is_registered(&conn->dev)) 139 return; 140 141 while (1) { 142 struct device *dev; 143 144 dev = device_find_child(&conn->dev, NULL, __match_tty); 145 if (!dev) 146 break; 147 device_move(dev, NULL, DPM_ORDER_DEV_LAST); 148 put_device(dev); 149 } 150 151 device_del(&conn->dev); 152 put_device(&conn->dev); 153 154 hci_dev_put(hdev); 155} 156 157static inline char *host_bustostr(int bus) 158{ 159 switch (bus) { 160 case HCI_VIRTUAL: 161 return "VIRTUAL"; 162 case HCI_USB: 163 return "USB"; 164 case HCI_PCCARD: 165 return "PCCARD"; 166 case HCI_UART: 167 return "UART"; 168 case HCI_RS232: 169 return "RS232"; 170 case HCI_PCI: 171 return "PCI"; 172 case HCI_SDIO: 173 return "SDIO"; 174 default: 175 return "UNKNOWN"; 176 } 177} 178 179static inline char *host_typetostr(int type) 180{ 181 switch (type) { 182 case HCI_BREDR: 183 return "BR/EDR"; 184 case HCI_AMP: 185 return "AMP"; 186 default: 187 return "UNKNOWN"; 188 } 189} 190 191static ssize_t show_bus(struct device *dev, 192 struct device_attribute *attr, char *buf) 193{ 194 struct hci_dev *hdev = to_hci_dev(dev); 195 return sprintf(buf, "%s\n", host_bustostr(hdev->bus)); 196} 197 198static ssize_t show_type(struct device *dev, 199 struct device_attribute *attr, char *buf) 200{ 201 struct hci_dev *hdev = to_hci_dev(dev); 202 return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type)); 203} 204 205static ssize_t show_name(struct device *dev, 206 struct device_attribute *attr, char *buf) 207{ 208 struct hci_dev *hdev = to_hci_dev(dev); 209 char name[HCI_MAX_NAME_LENGTH + 1]; 210 int i; 211 212 for (i = 0; i < HCI_MAX_NAME_LENGTH; i++) 213 name[i] = hdev->dev_name[i]; 214 215 name[HCI_MAX_NAME_LENGTH] = '\0'; 216 return sprintf(buf, "%s\n", name); 217} 218 219static ssize_t show_class(struct device *dev, 220 struct device_attribute *attr, char *buf) 221{ 222 struct hci_dev *hdev = to_hci_dev(dev); 223 return sprintf(buf, "0x%.2x%.2x%.2x\n", 224 hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]); 225} 226 227static ssize_t show_address(struct device *dev, 228 struct device_attribute *attr, char *buf) 229{ 230 struct hci_dev *hdev = to_hci_dev(dev); 231 return sprintf(buf, "%s\n", batostr(&hdev->bdaddr)); 232} 233 234static ssize_t show_features(struct device *dev, 235 struct device_attribute *attr, char *buf) 236{ 237 struct hci_dev *hdev = to_hci_dev(dev); 238 239 return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n", 240 hdev->features[0], hdev->features[1], 241 hdev->features[2], hdev->features[3], 242 hdev->features[4], hdev->features[5], 243 hdev->features[6], hdev->features[7]); 244} 245 246static ssize_t show_manufacturer(struct device *dev, 247 struct device_attribute *attr, char *buf) 248{ 249 struct hci_dev *hdev = to_hci_dev(dev); 250 return sprintf(buf, "%d\n", hdev->manufacturer); 251} 252 253static ssize_t show_hci_version(struct device *dev, 254 struct device_attribute *attr, char *buf) 255{ 256 struct hci_dev *hdev = to_hci_dev(dev); 257 return sprintf(buf, "%d\n", hdev->hci_ver); 258} 259 260static ssize_t show_hci_revision(struct device *dev, 261 struct device_attribute *attr, char *buf) 262{ 263 struct hci_dev *hdev = to_hci_dev(dev); 264 return sprintf(buf, "%d\n", hdev->hci_rev); 265} 266 267static ssize_t show_idle_timeout(struct device *dev, 268 struct device_attribute *attr, char *buf) 269{ 270 struct hci_dev *hdev = to_hci_dev(dev); 271 return sprintf(buf, "%d\n", hdev->idle_timeout); 272} 273 274static ssize_t store_idle_timeout(struct device *dev, 275 struct device_attribute *attr, 276 const char *buf, size_t count) 277{ 278 struct hci_dev *hdev = to_hci_dev(dev); 279 unsigned int val; 280 int rv; 281 282 rv = kstrtouint(buf, 0, &val); 283 if (rv < 0) 284 return rv; 285 286 if (val != 0 && (val < 500 || val > 3600000)) 287 return -EINVAL; 288 289 hdev->idle_timeout = val; 290 291 return count; 292} 293 294static ssize_t show_sniff_max_interval(struct device *dev, 295 struct device_attribute *attr, char *buf) 296{ 297 struct hci_dev *hdev = to_hci_dev(dev); 298 return sprintf(buf, "%d\n", hdev->sniff_max_interval); 299} 300 301static ssize_t store_sniff_max_interval(struct device *dev, 302 struct device_attribute *attr, 303 const char *buf, size_t count) 304{ 305 struct hci_dev *hdev = to_hci_dev(dev); 306 u16 val; 307 int rv; 308 309 rv = kstrtou16(buf, 0, &val); 310 if (rv < 0) 311 return rv; 312 313 if (val == 0 || val % 2 || val < hdev->sniff_min_interval) 314 return -EINVAL; 315 316 hdev->sniff_max_interval = val; 317 318 return count; 319} 320 321static ssize_t show_sniff_min_interval(struct device *dev, 322 struct device_attribute *attr, char *buf) 323{ 324 struct hci_dev *hdev = to_hci_dev(dev); 325 return sprintf(buf, "%d\n", hdev->sniff_min_interval); 326} 327 328static ssize_t store_sniff_min_interval(struct device *dev, 329 struct device_attribute *attr, 330 const char *buf, size_t count) 331{ 332 struct hci_dev *hdev = to_hci_dev(dev); 333 u16 val; 334 int rv; 335 336 rv = kstrtou16(buf, 0, &val); 337 if (rv < 0) 338 return rv; 339 340 if (val == 0 || val % 2 || val > hdev->sniff_max_interval) 341 return -EINVAL; 342 343 hdev->sniff_min_interval = val; 344 345 return count; 346} 347 348static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL); 349static DEVICE_ATTR(type, S_IRUGO, show_type, NULL); 350static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 351static DEVICE_ATTR(class, S_IRUGO, show_class, NULL); 352static DEVICE_ATTR(address, S_IRUGO, show_address, NULL); 353static DEVICE_ATTR(features, S_IRUGO, show_features, NULL); 354static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL); 355static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL); 356static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL); 357 358static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR, 359 show_idle_timeout, store_idle_timeout); 360static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR, 361 show_sniff_max_interval, store_sniff_max_interval); 362static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR, 363 show_sniff_min_interval, store_sniff_min_interval); 364 365static struct attribute *bt_host_attrs[] = { 366 &dev_attr_bus.attr, 367 &dev_attr_type.attr, 368 &dev_attr_name.attr, 369 &dev_attr_class.attr, 370 &dev_attr_address.attr, 371 &dev_attr_features.attr, 372 &dev_attr_manufacturer.attr, 373 &dev_attr_hci_version.attr, 374 &dev_attr_hci_revision.attr, 375 &dev_attr_idle_timeout.attr, 376 &dev_attr_sniff_max_interval.attr, 377 &dev_attr_sniff_min_interval.attr, 378 NULL 379}; 380 381static struct attribute_group bt_host_group = { 382 .attrs = bt_host_attrs, 383}; 384 385static const struct attribute_group *bt_host_groups[] = { 386 &bt_host_group, 387 NULL 388}; 389 390static void bt_host_release(struct device *dev) 391{ 392 struct hci_dev *hdev = to_hci_dev(dev); 393 kfree(hdev); 394 module_put(THIS_MODULE); 395} 396 397static struct device_type bt_host = { 398 .name = "host", 399 .groups = bt_host_groups, 400 .release = bt_host_release, 401}; 402 403static int inquiry_cache_show(struct seq_file *f, void *p) 404{ 405 struct hci_dev *hdev = f->private; 406 struct discovery_state *cache = &hdev->discovery; 407 struct inquiry_entry *e; 408 409 hci_dev_lock(hdev); 410 411 list_for_each_entry(e, &cache->all, all) { 412 struct inquiry_data *data = &e->data; 413 seq_printf(f, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n", 414 batostr(&data->bdaddr), 415 data->pscan_rep_mode, data->pscan_period_mode, 416 data->pscan_mode, data->dev_class[2], 417 data->dev_class[1], data->dev_class[0], 418 __le16_to_cpu(data->clock_offset), 419 data->rssi, data->ssp_mode, e->timestamp); 420 } 421 422 hci_dev_unlock(hdev); 423 424 return 0; 425} 426 427static int inquiry_cache_open(struct inode *inode, struct file *file) 428{ 429 return single_open(file, inquiry_cache_show, inode->i_private); 430} 431 432static const struct file_operations inquiry_cache_fops = { 433 .open = inquiry_cache_open, 434 .read = seq_read, 435 .llseek = seq_lseek, 436 .release = single_release, 437}; 438 439static int blacklist_show(struct seq_file *f, void *p) 440{ 441 struct hci_dev *hdev = f->private; 442 struct bdaddr_list *b; 443 444 hci_dev_lock(hdev); 445 446 list_for_each_entry(b, &hdev->blacklist, list) 447 seq_printf(f, "%s\n", batostr(&b->bdaddr)); 448 449 hci_dev_unlock(hdev); 450 451 return 0; 452} 453 454static int blacklist_open(struct inode *inode, struct file *file) 455{ 456 return single_open(file, blacklist_show, inode->i_private); 457} 458 459static const struct file_operations blacklist_fops = { 460 .open = blacklist_open, 461 .read = seq_read, 462 .llseek = seq_lseek, 463 .release = single_release, 464}; 465 466static void print_bt_uuid(struct seq_file *f, u8 *uuid) 467{ 468 __be32 data0, data4; 469 __be16 data1, data2, data3, data5; 470 471 memcpy(&data0, &uuid[0], 4); 472 memcpy(&data1, &uuid[4], 2); 473 memcpy(&data2, &uuid[6], 2); 474 memcpy(&data3, &uuid[8], 2); 475 memcpy(&data4, &uuid[10], 4); 476 memcpy(&data5, &uuid[14], 2); 477 478 seq_printf(f, "%.8x-%.4x-%.4x-%.4x-%.8x%.4x\n", 479 ntohl(data0), ntohs(data1), ntohs(data2), ntohs(data3), 480 ntohl(data4), ntohs(data5)); 481} 482 483static int uuids_show(struct seq_file *f, void *p) 484{ 485 struct hci_dev *hdev = f->private; 486 struct bt_uuid *uuid; 487 488 hci_dev_lock(hdev); 489 490 list_for_each_entry(uuid, &hdev->uuids, list) 491 print_bt_uuid(f, uuid->uuid); 492 493 hci_dev_unlock(hdev); 494 495 return 0; 496} 497 498static int uuids_open(struct inode *inode, struct file *file) 499{ 500 return single_open(file, uuids_show, inode->i_private); 501} 502 503static const struct file_operations uuids_fops = { 504 .open = uuids_open, 505 .read = seq_read, 506 .llseek = seq_lseek, 507 .release = single_release, 508}; 509 510static int auto_accept_delay_set(void *data, u64 val) 511{ 512 struct hci_dev *hdev = data; 513 514 hci_dev_lock(hdev); 515 516 hdev->auto_accept_delay = val; 517 518 hci_dev_unlock(hdev); 519 520 return 0; 521} 522 523static int auto_accept_delay_get(void *data, u64 *val) 524{ 525 struct hci_dev *hdev = data; 526 527 hci_dev_lock(hdev); 528 529 *val = hdev->auto_accept_delay; 530 531 hci_dev_unlock(hdev); 532 533 return 0; 534} 535 536DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get, 537 auto_accept_delay_set, "%llu\n"); 538 539void hci_init_sysfs(struct hci_dev *hdev) 540{ 541 struct device *dev = &hdev->dev; 542 543 dev->type = &bt_host; 544 dev->class = bt_class; 545 546 __module_get(THIS_MODULE); 547 device_initialize(dev); 548} 549 550int hci_add_sysfs(struct hci_dev *hdev) 551{ 552 struct device *dev = &hdev->dev; 553 int err; 554 555 BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus); 556 557 dev_set_name(dev, "%s", hdev->name); 558 559 err = device_add(dev); 560 if (err < 0) 561 return err; 562 563 if (!bt_debugfs) 564 return 0; 565 566 hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs); 567 if (!hdev->debugfs) 568 return 0; 569 570 debugfs_create_file("inquiry_cache", 0444, hdev->debugfs, 571 hdev, &inquiry_cache_fops); 572 573 debugfs_create_file("blacklist", 0444, hdev->debugfs, 574 hdev, &blacklist_fops); 575 576 debugfs_create_file("uuids", 0444, hdev->debugfs, hdev, &uuids_fops); 577 578 debugfs_create_file("auto_accept_delay", 0444, hdev->debugfs, hdev, 579 &auto_accept_delay_fops); 580 return 0; 581} 582 583void hci_del_sysfs(struct hci_dev *hdev) 584{ 585 BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus); 586 587 debugfs_remove_recursive(hdev->debugfs); 588 589 device_del(&hdev->dev); 590} 591 592int __init bt_sysfs_init(void) 593{ 594 bt_debugfs = debugfs_create_dir("bluetooth", NULL); 595 596 bt_class = class_create(THIS_MODULE, "bluetooth"); 597 if (IS_ERR(bt_class)) 598 return PTR_ERR(bt_class); 599 600 return 0; 601} 602 603void bt_sysfs_cleanup(void) 604{ 605 class_destroy(bt_class); 606 607 debugfs_remove_recursive(bt_debugfs); 608} 609