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         case LE_LINK:
  27                 return "LE";
  28         default:
  29                 return "UNKNOWN";
  30         }
  31 }
  32
  33 static ssize_t show_link_type(struct device *dev, struct device_attribute *attr, char *buf)
  34 {
  35         struct hci_conn *conn = dev_get_drvdata(dev);
  36         return sprintf(buf, "%s\n", link_typetostr(conn->type));
  37 }
  38
  39 static ssize_t show_link_address(struct device *dev, struct device_attribute *attr, char *buf)
  40 {
  41         struct hci_conn *conn = dev_get_drvdata(dev);
  42         return sprintf(buf, "%s\n", batostr(&conn->dst));
  43 }
  44
  45 static ssize_t show_link_features(struct device *dev, struct device_attribute *attr, char *buf)
  46 {
  47         struct hci_conn *conn = dev_get_drvdata(dev);
  48
  49         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
  50                                 conn->features[0], conn->features[1],
  51                                 conn->features[2], conn->features[3],
  52                                 conn->features[4], conn->features[5],
  53                                 conn->features[6], conn->features[7]);
  54 }
  55
  56 #define LINK_ATTR(_name, _mode, _show, _store) \
  57 struct device_attribute link_attr_##_name = __ATTR(_name, _mode, _show, _store)
  58
  59 static LINK_ATTR(type, S_IRUGO, show_link_type, NULL);
  60 static LINK_ATTR(address, S_IRUGO, show_link_address, NULL);
  61 static LINK_ATTR(features, S_IRUGO, show_link_features, NULL);
  62
  63 static struct attribute *bt_link_attrs[] = {
  64         &link_attr_type.attr,
  65         &link_attr_address.attr,
  66         &link_attr_features.attr,
  67         NULL
  68 };
  69
  70 static struct attribute_group bt_link_group = {
  71         .attrs = bt_link_attrs,
  72 };
  73
  74 static const struct attribute_group *bt_link_groups[] = {
  75         &bt_link_group,
  76         NULL
  77 };
  78
  79 static void bt_link_release(struct device *dev)
  80 {
  81         void *data = dev_get_drvdata(dev);
  82         kfree(data);
  83 }
  84
  85 static struct device_type bt_link = {
  86         .name    = "link",
  87         .groups  = bt_link_groups,
  88         .release = bt_link_release,
  89 };
  90
  91 static void add_conn(struct work_struct *work)
  92 {
  93         struct hci_conn *conn = container_of(work, struct hci_conn, work_add);
  94         struct hci_dev *hdev = conn->hdev;
  95
  96         dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
  97
  98         dev_set_drvdata(&conn->dev, conn);
  99
 100         if (device_add(&conn->dev) < 0) {
 101                 BT_ERR("Failed to register connection device");
 102                 return;
 103         }
 104
 105         hci_dev_hold(hdev);
 106 }
 107
 108 /*
 109  * The rfcomm tty device will possibly retain even when conn
 110  * is down, and sysfs doesn't support move zombie device,
 111  * so we should move the device before conn device is destroyed.
 112  */
 113 static int __match_tty(struct device *dev, void *data)
 114 {
 115         return !strncmp(dev_name(dev), "rfcomm", 6);
 116 }
 117
 118 static void del_conn(struct work_struct *work)
 119 {
 120         struct hci_conn *conn = container_of(work, struct hci_conn, work_del);
 121         struct hci_dev *hdev = conn->hdev;
 122
 123         if (!device_is_registered(&conn->dev))
 124                 return;
 125
 126         while (1) {
 127                 struct device *dev;
 128
 129                 dev = device_find_child(&conn->dev, NULL, __match_tty);
 130                 if (!dev)
 131                         break;
 132                 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
 133                 put_device(dev);
 134         }
 135
 136         device_del(&conn->dev);
 137         put_device(&conn->dev);
 138
 139         hci_dev_put(hdev);
 140 }
 141
 142 void hci_conn_init_sysfs(struct hci_conn *conn)
 143 {
 144         struct hci_dev *hdev = conn->hdev;
 145
 146         BT_DBG("conn %p", conn);
 147
 148         conn->dev.type = &bt_link;
 149         conn->dev.class = bt_class;
 150         conn->dev.parent = &hdev->dev;
 151
 152         device_initialize(&conn->dev);
 153
 154         INIT_WORK(&conn->work_add, add_conn);
 155         INIT_WORK(&conn->work_del, del_conn);
 156 }
 157
 158 void hci_conn_add_sysfs(struct hci_conn *conn)
 159 {
 160         BT_DBG("conn %p", conn);
 161
 162         queue_work(conn->hdev->workqueue, &conn->work_add);
 163 }
 164
 165 void hci_conn_del_sysfs(struct hci_conn *conn)
 166 {
 167         BT_DBG("conn %p", conn);
 168
 169         queue_work(conn->hdev->workqueue, &conn->work_del);
 170 }
 171
 172 static inline char *host_bustostr(int bus)
 173 {
 174         switch (bus) {
 175         case HCI_VIRTUAL:
 176                 return "VIRTUAL";
 177         case HCI_USB:
 178                 return "USB";
 179         case HCI_PCCARD:
 180                 return "PCCARD";
 181         case HCI_UART:
 182                 return "UART";
 183         case HCI_RS232:
 184                 return "RS232";
 185         case HCI_PCI:
 186                 return "PCI";
 187         case HCI_SDIO:
 188                 return "SDIO";
 189         default:
 190                 return "UNKNOWN";
 191         }
 192 }
 193
 194 static inline char *host_typetostr(int type)
 195 {
 196         switch (type) {
 197         case HCI_BREDR:
 198                 return "BR/EDR";
 199         case HCI_AMP:
 200                 return "AMP";
 201         default:
 202                 return "UNKNOWN";
 203         }
 204 }
 205
 206 static ssize_t show_bus(struct device *dev, struct device_attribute *attr, char *buf)
 207 {
 208         struct hci_dev *hdev = dev_get_drvdata(dev);
 209         return sprintf(buf, "%s\n", host_bustostr(hdev->bus));
 210 }
 211
 212 static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
 213 {
 214         struct hci_dev *hdev = dev_get_drvdata(dev);
 215         return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type));
 216 }
 217
 218 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
 219 {
 220         struct hci_dev *hdev = dev_get_drvdata(dev);
 221         char name[HCI_MAX_NAME_LENGTH + 1];
 222         int i;
 223
 224         for (i = 0; i < HCI_MAX_NAME_LENGTH; i++)
 225                 name[i] = hdev->dev_name[i];
 226
 227         name[HCI_MAX_NAME_LENGTH] = '\0';
 228         return sprintf(buf, "%s\n", name);
 229 }
 230
 231 static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
 232 {
 233         struct hci_dev *hdev = dev_get_drvdata(dev);
 234         return sprintf(buf, "0x%.2x%.2x%.2x\n",
 235                         hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
 236 }
 237
 238 static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
 239 {
 240         struct hci_dev *hdev = dev_get_drvdata(dev);
 241         return sprintf(buf, "%s\n", batostr(&hdev->bdaddr));
 242 }
 243
 244 static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
 245 {
 246         struct hci_dev *hdev = dev_get_drvdata(dev);
 247
 248         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 249                                 hdev->features[0], hdev->features[1],
 250                                 hdev->features[2], hdev->features[3],
 251                                 hdev->features[4], hdev->features[5],
 252                                 hdev->features[6], hdev->features[7]);
 253 }
 254
 255 static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
 256 {
 257         struct hci_dev *hdev = dev_get_drvdata(dev);
 258         return sprintf(buf, "%d\n", hdev->manufacturer);
 259 }
 260
 261 static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
 262 {
 263         struct hci_dev *hdev = dev_get_drvdata(dev);
 264         return sprintf(buf, "%d\n", hdev->hci_ver);
 265 }
 266
 267 static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
 268 {
 269         struct hci_dev *hdev = dev_get_drvdata(dev);
 270         return sprintf(buf, "%d\n", hdev->hci_rev);
 271 }
 272
 273 static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 274 {
 275         struct hci_dev *hdev = dev_get_drvdata(dev);
 276         return sprintf(buf, "%d\n", hdev->idle_timeout);
 277 }
 278
 279 static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 280 {
 281         struct hci_dev *hdev = dev_get_drvdata(dev);
 282         unsigned int val;
 283         int rv;
 284
 285         rv = kstrtouint(buf, 0, &val);
 286         if (rv < 0)
 287                 return rv;
 288
 289         if (val != 0 && (val < 500 || val > 3600000))
 290                 return -EINVAL;
 291
 292         hdev->idle_timeout = val;
 293
 294         return count;
 295 }
 296
 297 static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
 298 {
 299         struct hci_dev *hdev = dev_get_drvdata(dev);
 300         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 301 }
 302
 303 static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 304 {
 305         struct hci_dev *hdev = dev_get_drvdata(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
 321 static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
 322 {
 323         struct hci_dev *hdev = dev_get_drvdata(dev);
 324         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 325 }
 326
 327 static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 328 {
 329         struct hci_dev *hdev = dev_get_drvdata(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         void *data = dev_get_drvdata(dev);
 390         kfree(data);
 391 }
 392
 393 static struct device_type bt_host = {
 394         .name    = "host",
 395         .groups  = bt_host_groups,
 396         .release = bt_host_release,
 397 };
 398
 399 static int inquiry_cache_show(struct seq_file *f, void *p)
 400 {
 401         struct hci_dev *hdev = f->private;
 402         struct inquiry_cache *cache = &hdev->inq_cache;
 403         struct inquiry_entry *e;
 404
 405         hci_dev_lock_bh(hdev);
 406
 407         for (e = cache->list; e; e = e->next) {
 408                 struct inquiry_data *data = &e->data;
 409                 seq_printf(f, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
 410                            batostr(&data->bdaddr),
 411                            data->pscan_rep_mode, data->pscan_period_mode,
 412                            data->pscan_mode, data->dev_class[2],
 413                            data->dev_class[1], data->dev_class[0],
 414                            __le16_to_cpu(data->clock_offset),
 415                            data->rssi, data->ssp_mode, e->timestamp);
 416         }
 417
 418         hci_dev_unlock_bh(hdev);
 419
 420         return 0;
 421 }
 422
 423 static int inquiry_cache_open(struct inode *inode, struct file *file)
 424 {
 425         return single_open(file, inquiry_cache_show, inode->i_private);
 426 }
 427
 428 static const struct file_operations inquiry_cache_fops = {
 429         .open           = inquiry_cache_open,
 430         .read           = seq_read,
 431         .llseek         = seq_lseek,
 432         .release        = single_release,
 433 };
 434
 435 static int blacklist_show(struct seq_file *f, void *p)
 436 {
 437         struct hci_dev *hdev = f->private;
 438         struct list_head *l;
 439
 440         hci_dev_lock_bh(hdev);
 441
 442         list_for_each(l, &hdev->blacklist) {
 443                 struct bdaddr_list *b;
 444
 445                 b = list_entry(l, struct bdaddr_list, list);
 446
 447                 seq_printf(f, "%s\n", batostr(&b->bdaddr));
 448         }
 449
 450         hci_dev_unlock_bh(hdev);
 451
 452         return 0;
 453 }
 454
 455 static int blacklist_open(struct inode *inode, struct file *file)
 456 {
 457         return single_open(file, blacklist_show, inode->i_private);
 458 }
 459
 460 static const struct file_operations blacklist_fops = {
 461         .open           = blacklist_open,
 462         .read           = seq_read,
 463         .llseek         = seq_lseek,
 464         .release        = single_release,
 465 };
 466
 467 static void print_bt_uuid(struct seq_file *f, u8 *uuid)
 468 {
 469         u32 data0, data4;
 470         u16 data1, data2, data3, data5;
 471
 472         memcpy(&data0, &uuid[0], 4);
 473         memcpy(&data1, &uuid[4], 2);
 474         memcpy(&data2, &uuid[6], 2);
 475         memcpy(&data3, &uuid[8], 2);
 476         memcpy(&data4, &uuid[10], 4);
 477         memcpy(&data5, &uuid[14], 2);
 478
 479         seq_printf(f, "%.8x-%.4x-%.4x-%.4x-%.8x%.4x\n",
 480                                 ntohl(data0), ntohs(data1), ntohs(data2),
 481                                 ntohs(data3), ntohl(data4), ntohs(data5));
 482 }
 483
 484 static int uuids_show(struct seq_file *f, void *p)
 485 {
 486         struct hci_dev *hdev = f->private;
 487         struct list_head *l;
 488
 489         hci_dev_lock_bh(hdev);
 490
 491         list_for_each(l, &hdev->uuids) {
 492                 struct bt_uuid *uuid;
 493
 494                 uuid = list_entry(l, struct bt_uuid, list);
 495
 496                 print_bt_uuid(f, uuid->uuid);
 497         }
 498
 499         hci_dev_unlock_bh(hdev);
 500
 501         return 0;
 502 }
 503
 504 static int uuids_open(struct inode *inode, struct file *file)
 505 {
 506         return single_open(file, uuids_show, inode->i_private);
 507 }
 508
 509 static const struct file_operations uuids_fops = {
 510         .open           = uuids_open,
 511         .read           = seq_read,
 512         .llseek         = seq_lseek,
 513         .release        = single_release,
 514 };
 515
 516 static int auto_accept_delay_set(void *data, u64 val)
 517 {
 518         struct hci_dev *hdev = data;
 519
 520         hci_dev_lock_bh(hdev);
 521
 522         hdev->auto_accept_delay = val;
 523
 524         hci_dev_unlock_bh(hdev);
 525
 526         return 0;
 527 }
 528
 529 static int auto_accept_delay_get(void *data, u64 *val)
 530 {
 531         struct hci_dev *hdev = data;
 532
 533         hci_dev_lock_bh(hdev);
 534
 535         *val = hdev->auto_accept_delay;
 536
 537         hci_dev_unlock_bh(hdev);
 538
 539         return 0;
 540 }
 541
 542 DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get,
 543                                         auto_accept_delay_set, "%llu\n");
 544
 545 int hci_register_sysfs(struct hci_dev *hdev)
 546 {
 547         struct device *dev = &hdev->dev;
 548         int err;
 549
 550         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 551
 552         dev->type = &bt_host;
 553         dev->class = bt_class;
 554         dev->parent = hdev->parent;
 555
 556         dev_set_name(dev, "%s", hdev->name);
 557
 558         dev_set_drvdata(dev, hdev);
 559
 560         err = device_register(dev);
 561         if (err < 0)
 562                 return err;
 563
 564         if (!bt_debugfs)
 565                 return 0;
 566
 567         hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
 568         if (!hdev->debugfs)
 569                 return 0;
 570
 571         debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
 572                                                 hdev, &inquiry_cache_fops);
 573
 574         debugfs_create_file("blacklist", 0444, hdev->debugfs,
 575                                                 hdev, &blacklist_fops);
 576
 577         debugfs_create_file("uuids", 0444, hdev->debugfs, hdev, &uuids_fops);
 578
 579         debugfs_create_file("auto_accept_delay", 0444, hdev->debugfs, hdev,
 580                                                 &auto_accept_delay_fops);
 581         return 0;
 582 }
 583
 584 void hci_unregister_sysfs(struct hci_dev *hdev)
 585 {
 586         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 587
 588         debugfs_remove_recursive(hdev->debugfs);
 589
 590         device_del(&hdev->dev);
 591 }
 592
 593 int __init bt_sysfs_init(void)
 594 {
 595         bt_debugfs = debugfs_create_dir("bluetooth", NULL);
 596
 597         bt_class = class_create(THIS_MODULE, "bluetooth");
 598         if (IS_ERR(bt_class))
 599                 return PTR_ERR(bt_class);
 600
 601         return 0;
 602 }
 603
 604 void bt_sysfs_cleanup(void)
 605 {
 606         class_destroy(bt_class);
 607
 608         debugfs_remove_recursive(bt_debugfs);
 609 }