net/bluetooth/hci_sysfs.c

   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 }