net/bluetooth/hci_sysfs.c

   1 /* Bluetooth HCI driver model support. */
   2
   3 #include <linux/debugfs.h>
   4 #include <linux/module.h>
   5 #include <asm/unaligned.h>
   6
   7 #include <net/bluetooth/bluetooth.h>
   8 #include <net/bluetooth/hci_core.h>
   9
  10 static struct class *bt_class;
  11
  12 struct dentry *bt_debugfs;
  13 EXPORT_SYMBOL_GPL(bt_debugfs);
  14
  15 static inline char *link_typetostr(int type)
  16 {
  17         switch (type) {
  18         case ACL_LINK:
  19                 return "ACL";
  20         case SCO_LINK:
  21                 return "SCO";
  22         case ESCO_LINK:
  23                 return "eSCO";
  24         case LE_LINK:
  25                 return "LE";
  26         default:
  27                 return "UNKNOWN";
  28         }
  29 }
  30
  31 static ssize_t show_link_type(struct device *dev,
  32                               struct device_attribute *attr, char *buf)
  33 {
  34         struct hci_conn *conn = to_hci_conn(dev);
  35         return sprintf(buf, "%s\n", link_typetostr(conn->type));
  36 }
  37
  38 static ssize_t show_link_address(struct device *dev,
  39                                  struct device_attribute *attr, char *buf)
  40 {
  41         struct hci_conn *conn = to_hci_conn(dev);
  42         return sprintf(buf, "%pMR\n", &conn->dst);
  43 }
  44
  45 static ssize_t show_link_features(struct device *dev,
  46                                   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) \
  58 struct device_attribute link_attr_##_name = __ATTR(_name, _mode, _show, _store)
  59
  60 static LINK_ATTR(type, S_IRUGO, show_link_type, NULL);
  61 static LINK_ATTR(address, S_IRUGO, show_link_address, NULL);
  62 static LINK_ATTR(features, S_IRUGO, show_link_features, NULL);
  63
  64 static struct attribute *bt_link_attrs[] = {
  65         &link_attr_type.attr,
  66         &link_attr_address.attr,
  67         &link_attr_features.attr,
  68         NULL
  69 };
  70
  71 static struct attribute_group bt_link_group = {
  72         .attrs = bt_link_attrs,
  73 };
  74
  75 static const struct attribute_group *bt_link_groups[] = {
  76         &bt_link_group,
  77         NULL
  78 };
  79
  80 static void bt_link_release(struct device *dev)
  81 {
  82         struct hci_conn *conn = to_hci_conn(dev);
  83         kfree(conn);
  84 }
  85
  86 static 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  */
  97 static int __match_tty(struct device *dev, void *data)
  98 {
  99         return !strncmp(dev_name(dev), "rfcomm", 6);
 100 }
 101
 102 void 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
 115 void 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
 131 void 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
 154 static 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
 176 static 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
 188 static ssize_t show_bus(struct device *dev,
 189                         struct device_attribute *attr, char *buf)
 190 {
 191         struct hci_dev *hdev = to_hci_dev(dev);
 192         return sprintf(buf, "%s\n", host_bustostr(hdev->bus));
 193 }
 194
 195 static ssize_t show_type(struct device *dev,
 196                          struct device_attribute *attr, char *buf)
 197 {
 198         struct hci_dev *hdev = to_hci_dev(dev);
 199         return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type));
 200 }
 201
 202 static ssize_t show_name(struct device *dev,
 203                          struct device_attribute *attr, char *buf)
 204 {
 205         struct hci_dev *hdev = to_hci_dev(dev);
 206         char name[HCI_MAX_NAME_LENGTH + 1];
 207         int i;
 208
 209         for (i = 0; i < HCI_MAX_NAME_LENGTH; i++)
 210                 name[i] = hdev->dev_name[i];
 211
 212         name[HCI_MAX_NAME_LENGTH] = '\0';
 213         return sprintf(buf, "%s\n", name);
 214 }
 215
 216 static ssize_t show_class(struct device *dev,
 217                           struct device_attribute *attr, char *buf)
 218 {
 219         struct hci_dev *hdev = to_hci_dev(dev);
 220         return sprintf(buf, "0x%.2x%.2x%.2x\n", hdev->dev_class[2],
 221                        hdev->dev_class[1], hdev->dev_class[0]);
 222 }
 223
 224 static ssize_t show_address(struct device *dev,
 225                             struct device_attribute *attr, char *buf)
 226 {
 227         struct hci_dev *hdev = to_hci_dev(dev);
 228         return sprintf(buf, "%pMR\n", &hdev->bdaddr);
 229 }
 230
 231 static ssize_t show_features(struct device *dev,
 232                              struct device_attribute *attr, char *buf)
 233 {
 234         struct hci_dev *hdev = to_hci_dev(dev);
 235
 236         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 237                        hdev->features[0], hdev->features[1],
 238                        hdev->features[2], hdev->features[3],
 239                        hdev->features[4], hdev->features[5],
 240                        hdev->features[6], hdev->features[7]);
 241 }
 242
 243 static ssize_t show_manufacturer(struct device *dev,
 244                                  struct device_attribute *attr, char *buf)
 245 {
 246         struct hci_dev *hdev = to_hci_dev(dev);
 247         return sprintf(buf, "%d\n", hdev->manufacturer);
 248 }
 249
 250 static ssize_t show_hci_version(struct device *dev,
 251                                 struct device_attribute *attr, char *buf)
 252 {
 253         struct hci_dev *hdev = to_hci_dev(dev);
 254         return sprintf(buf, "%d\n", hdev->hci_ver);
 255 }
 256
 257 static ssize_t show_hci_revision(struct device *dev,
 258                                  struct device_attribute *attr, char *buf)
 259 {
 260         struct hci_dev *hdev = to_hci_dev(dev);
 261         return sprintf(buf, "%d\n", hdev->hci_rev);
 262 }
 263
 264 static ssize_t show_idle_timeout(struct device *dev,
 265                                  struct device_attribute *attr, char *buf)
 266 {
 267         struct hci_dev *hdev = to_hci_dev(dev);
 268         return sprintf(buf, "%d\n", hdev->idle_timeout);
 269 }
 270
 271 static ssize_t store_idle_timeout(struct device *dev,
 272                                   struct device_attribute *attr,
 273                                   const char *buf, size_t count)
 274 {
 275         struct hci_dev *hdev = to_hci_dev(dev);
 276         unsigned int val;
 277         int rv;
 278
 279         rv = kstrtouint(buf, 0, &val);
 280         if (rv < 0)
 281                 return rv;
 282
 283         if (val != 0 && (val < 500 || val > 3600000))
 284                 return -EINVAL;
 285
 286         hdev->idle_timeout = val;
 287
 288         return count;
 289 }
 290
 291 static ssize_t show_sniff_max_interval(struct device *dev,
 292                                        struct device_attribute *attr, char *buf)
 293 {
 294         struct hci_dev *hdev = to_hci_dev(dev);
 295         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 296 }
 297
 298 static ssize_t store_sniff_max_interval(struct device *dev,
 299                                         struct device_attribute *attr,
 300                                         const char *buf, size_t count)
 301 {
 302         struct hci_dev *hdev = to_hci_dev(dev);
 303         u16 val;
 304         int rv;
 305
 306         rv = kstrtou16(buf, 0, &val);
 307         if (rv < 0)
 308                 return rv;
 309
 310         if (val == 0 || val % 2 || val < hdev->sniff_min_interval)
 311                 return -EINVAL;
 312
 313         hdev->sniff_max_interval = val;
 314
 315         return count;
 316 }
 317
 318 static ssize_t show_sniff_min_interval(struct device *dev,
 319                                        struct device_attribute *attr, char *buf)
 320 {
 321         struct hci_dev *hdev = to_hci_dev(dev);
 322         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 323 }
 324
 325 static ssize_t store_sniff_min_interval(struct device *dev,
 326                                         struct device_attribute *attr,
 327                                         const char *buf, size_t count)
 328 {
 329         struct hci_dev *hdev = to_hci_dev(dev);
 330         u16 val;
 331         int rv;
 332
 333         rv = kstrtou16(buf, 0, &val);
 334         if (rv < 0)
 335                 return rv;
 336
 337         if (val == 0 || val % 2 || val > hdev->sniff_max_interval)
 338                 return -EINVAL;
 339
 340         hdev->sniff_min_interval = val;
 341
 342         return count;
 343 }
 344
 345 static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL);
 346 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 347 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 348 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 349 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 350 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 351 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 352 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 353 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 354
 355 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 356                    show_idle_timeout, store_idle_timeout);
 357 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 358                    show_sniff_max_interval, store_sniff_max_interval);
 359 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 360                    show_sniff_min_interval, store_sniff_min_interval);
 361
 362 static struct attribute *bt_host_attrs[] = {
 363         &dev_attr_bus.attr,
 364         &dev_attr_type.attr,
 365         &dev_attr_name.attr,
 366         &dev_attr_class.attr,
 367         &dev_attr_address.attr,
 368         &dev_attr_features.attr,
 369         &dev_attr_manufacturer.attr,
 370         &dev_attr_hci_version.attr,
 371         &dev_attr_hci_revision.attr,
 372         &dev_attr_idle_timeout.attr,
 373         &dev_attr_sniff_max_interval.attr,
 374         &dev_attr_sniff_min_interval.attr,
 375         NULL
 376 };
 377
 378 static struct attribute_group bt_host_group = {
 379         .attrs = bt_host_attrs,
 380 };
 381
 382 static const struct attribute_group *bt_host_groups[] = {
 383         &bt_host_group,
 384         NULL
 385 };
 386
 387 static void bt_host_release(struct device *dev)
 388 {
 389         struct hci_dev *hdev = to_hci_dev(dev);
 390         kfree(hdev);
 391         module_put(THIS_MODULE);
 392 }
 393
 394 static struct device_type bt_host = {
 395         .name    = "host",
 396         .groups  = bt_host_groups,
 397         .release = bt_host_release,
 398 };
 399
 400 static int inquiry_cache_show(struct seq_file *f, void *p)
 401 {
 402         struct hci_dev *hdev = f->private;
 403         struct discovery_state *cache = &hdev->discovery;
 404         struct inquiry_entry *e;
 405
 406         hci_dev_lock(hdev);
 407
 408         list_for_each_entry(e, &cache->all, all) {
 409                 struct inquiry_data *data = &e->data;
 410                 seq_printf(f, "%pMR %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
 411                            &data->bdaddr,
 412                            data->pscan_rep_mode, data->pscan_period_mode,
 413                            data->pscan_mode, data->dev_class[2],
 414                            data->dev_class[1], data->dev_class[0],
 415                            __le16_to_cpu(data->clock_offset),
 416                            data->rssi, data->ssp_mode, e->timestamp);
 417         }
 418
 419         hci_dev_unlock(hdev);
 420
 421         return 0;
 422 }
 423
 424 static int inquiry_cache_open(struct inode *inode, struct file *file)
 425 {
 426         return single_open(file, inquiry_cache_show, inode->i_private);
 427 }
 428
 429 static const struct file_operations inquiry_cache_fops = {
 430         .open           = inquiry_cache_open,
 431         .read           = seq_read,
 432         .llseek         = seq_lseek,
 433         .release        = single_release,
 434 };
 435
 436 static int blacklist_show(struct seq_file *f, void *p)
 437 {
 438         struct hci_dev *hdev = f->private;
 439         struct bdaddr_list *b;
 440
 441         hci_dev_lock(hdev);
 442
 443         list_for_each_entry(b, &hdev->blacklist, list)
 444                 seq_printf(f, "%pMR\n", &b->bdaddr);
 445
 446         hci_dev_unlock(hdev);
 447
 448         return 0;
 449 }
 450
 451 static int blacklist_open(struct inode *inode, struct file *file)
 452 {
 453         return single_open(file, blacklist_show, inode->i_private);
 454 }
 455
 456 static const struct file_operations blacklist_fops = {
 457         .open           = blacklist_open,
 458         .read           = seq_read,
 459         .llseek         = seq_lseek,
 460         .release        = single_release,
 461 };
 462
 463 static void print_bt_uuid(struct seq_file *f, u8 *uuid)
 464 {
 465         u32 data0, data5;
 466         u16 data1, data2, data3, data4;
 467
 468         data5 = get_unaligned_le32(uuid);
 469         data4 = get_unaligned_le16(uuid + 4);
 470         data3 = get_unaligned_le16(uuid + 6);
 471         data2 = get_unaligned_le16(uuid + 8);
 472         data1 = get_unaligned_le16(uuid + 10);
 473         data0 = get_unaligned_le32(uuid + 12);
 474
 475         seq_printf(f, "%.8x-%.4x-%.4x-%.4x-%.4x%.8x\n",
 476                    data0, data1, data2, data3, data4, data5);
 477 }
 478
 479 static int uuids_show(struct seq_file *f, void *p)
 480 {
 481         struct hci_dev *hdev = f->private;
 482         struct bt_uuid *uuid;
 483
 484         hci_dev_lock(hdev);
 485
 486         list_for_each_entry(uuid, &hdev->uuids, list)
 487                 print_bt_uuid(f, uuid->uuid);
 488
 489         hci_dev_unlock(hdev);
 490
 491         return 0;
 492 }
 493
 494 static int uuids_open(struct inode *inode, struct file *file)
 495 {
 496         return single_open(file, uuids_show, inode->i_private);
 497 }
 498
 499 static const struct file_operations uuids_fops = {
 500         .open           = uuids_open,
 501         .read           = seq_read,
 502         .llseek         = seq_lseek,
 503         .release        = single_release,
 504 };
 505
 506 static int auto_accept_delay_set(void *data, u64 val)
 507 {
 508         struct hci_dev *hdev = data;
 509
 510         hci_dev_lock(hdev);
 511
 512         hdev->auto_accept_delay = val;
 513
 514         hci_dev_unlock(hdev);
 515
 516         return 0;
 517 }
 518
 519 static int auto_accept_delay_get(void *data, u64 *val)
 520 {
 521         struct hci_dev *hdev = data;
 522
 523         hci_dev_lock(hdev);
 524
 525         *val = hdev->auto_accept_delay;
 526
 527         hci_dev_unlock(hdev);
 528
 529         return 0;
 530 }
 531
 532 DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get,
 533                         auto_accept_delay_set, "%llu\n");
 534
 535 void hci_init_sysfs(struct hci_dev *hdev)
 536 {
 537         struct device *dev = &hdev->dev;
 538
 539         dev->type = &bt_host;
 540         dev->class = bt_class;
 541
 542         __module_get(THIS_MODULE);
 543         device_initialize(dev);
 544 }
 545
 546 int hci_add_sysfs(struct hci_dev *hdev)
 547 {
 548         struct device *dev = &hdev->dev;
 549         int err;
 550
 551         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 552
 553         dev_set_name(dev, "%s", hdev->name);
 554
 555         err = device_add(dev);
 556         if (err < 0)
 557                 return err;
 558
 559         if (!bt_debugfs)
 560                 return 0;
 561
 562         hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
 563         if (!hdev->debugfs)
 564                 return 0;
 565
 566         debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
 567                             hdev, &inquiry_cache_fops);
 568
 569         debugfs_create_file("blacklist", 0444, hdev->debugfs,
 570                             hdev, &blacklist_fops);
 571
 572         debugfs_create_file("uuids", 0444, hdev->debugfs, hdev, &uuids_fops);
 573
 574         debugfs_create_file("auto_accept_delay", 0444, hdev->debugfs, hdev,
 575                             &auto_accept_delay_fops);
 576         return 0;
 577 }
 578
 579 void hci_del_sysfs(struct hci_dev *hdev)
 580 {
 581         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 582
 583         debugfs_remove_recursive(hdev->debugfs);
 584
 585         device_del(&hdev->dev);
 586 }
 587
 588 int __init bt_sysfs_init(void)
 589 {
 590         bt_debugfs = debugfs_create_dir("bluetooth", NULL);
 591
 592         bt_class = class_create(THIS_MODULE, "bluetooth");
 593
 594         return PTR_RET(bt_class);
 595 }
 596
 597 void bt_sysfs_cleanup(void)
 598 {
 599         class_destroy(bt_class);
 600
 601         debugfs_remove_recursive(bt_debugfs);
 602 }