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 #include <linux/module.h>
   9
  10 #include <net/bluetooth/bluetooth.h>
  11 #include <net/bluetooth/hci_core.h>
  12
  13 static struct class *bt_class;
  14
  15 struct dentry *bt_debugfs;
  16 EXPORT_SYMBOL_GPL(bt_debugfs);
  17
  18 static 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
  34 static ssize_t show_link_type(struct device *dev, struct device_attribute *attr, char *buf)
  35 {
  36         struct hci_conn *conn = to_hci_conn(dev);
  37         return sprintf(buf, "%s\n", link_typetostr(conn->type));
  38 }
  39
  40 static ssize_t show_link_address(struct device *dev, struct device_attribute *attr, char *buf)
  41 {
  42         struct hci_conn *conn = to_hci_conn(dev);
  43         return sprintf(buf, "%s\n", batostr(&conn->dst));
  44 }
  45
  46 static ssize_t show_link_features(struct device *dev, 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, struct device_attribute *attr, char *buf)
 189 {
 190         struct hci_dev *hdev = to_hci_dev(dev);
 191         return sprintf(buf, "%s\n", host_bustostr(hdev->bus));
 192 }
 193
 194 static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
 195 {
 196         struct hci_dev *hdev = to_hci_dev(dev);
 197         return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type));
 198 }
 199
 200 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
 201 {
 202         struct hci_dev *hdev = to_hci_dev(dev);
 203         char name[HCI_MAX_NAME_LENGTH + 1];
 204         int i;
 205
 206         for (i = 0; i < HCI_MAX_NAME_LENGTH; i++)
 207                 name[i] = hdev->dev_name[i];
 208
 209         name[HCI_MAX_NAME_LENGTH] = '\0';
 210         return sprintf(buf, "%s\n", name);
 211 }
 212
 213 static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
 214 {
 215         struct hci_dev *hdev = to_hci_dev(dev);
 216         return sprintf(buf, "0x%.2x%.2x%.2x\n",
 217                         hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
 218 }
 219
 220 static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
 221 {
 222         struct hci_dev *hdev = to_hci_dev(dev);
 223         return sprintf(buf, "%s\n", batostr(&hdev->bdaddr));
 224 }
 225
 226 static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
 227 {
 228         struct hci_dev *hdev = to_hci_dev(dev);
 229
 230         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 231                                 hdev->features[0], hdev->features[1],
 232                                 hdev->features[2], hdev->features[3],
 233                                 hdev->features[4], hdev->features[5],
 234                                 hdev->features[6], hdev->features[7]);
 235 }
 236
 237 static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
 238 {
 239         struct hci_dev *hdev = to_hci_dev(dev);
 240         return sprintf(buf, "%d\n", hdev->manufacturer);
 241 }
 242
 243 static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
 244 {
 245         struct hci_dev *hdev = to_hci_dev(dev);
 246         return sprintf(buf, "%d\n", hdev->hci_ver);
 247 }
 248
 249 static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
 250 {
 251         struct hci_dev *hdev = to_hci_dev(dev);
 252         return sprintf(buf, "%d\n", hdev->hci_rev);
 253 }
 254
 255 static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 256 {
 257         struct hci_dev *hdev = to_hci_dev(dev);
 258         return sprintf(buf, "%d\n", hdev->idle_timeout);
 259 }
 260
 261 static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 262 {
 263         struct hci_dev *hdev = to_hci_dev(dev);
 264         unsigned int val;
 265         int rv;
 266
 267         rv = kstrtouint(buf, 0, &val);
 268         if (rv < 0)
 269                 return rv;
 270
 271         if (val != 0 && (val < 500 || val > 3600000))
 272                 return -EINVAL;
 273
 274         hdev->idle_timeout = val;
 275
 276         return count;
 277 }
 278
 279 static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
 280 {
 281         struct hci_dev *hdev = to_hci_dev(dev);
 282         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 283 }
 284
 285 static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 286 {
 287         struct hci_dev *hdev = to_hci_dev(dev);
 288         u16 val;
 289         int rv;
 290
 291         rv = kstrtou16(buf, 0, &val);
 292         if (rv < 0)
 293                 return rv;
 294
 295         if (val == 0 || val % 2 || val < hdev->sniff_min_interval)
 296                 return -EINVAL;
 297
 298         hdev->sniff_max_interval = val;
 299
 300         return count;
 301 }
 302
 303 static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
 304 {
 305         struct hci_dev *hdev = to_hci_dev(dev);
 306         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 307 }
 308
 309 static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 310 {
 311         struct hci_dev *hdev = to_hci_dev(dev);
 312         u16 val;
 313         int rv;
 314
 315         rv = kstrtou16(buf, 0, &val);
 316         if (rv < 0)
 317                 return rv;
 318
 319         if (val == 0 || val % 2 || val > hdev->sniff_max_interval)
 320                 return -EINVAL;
 321
 322         hdev->sniff_min_interval = val;
 323
 324         return count;
 325 }
 326
 327 static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL);
 328 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 329 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 330 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 331 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 332 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 333 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 334 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 335 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 336
 337 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 338                                 show_idle_timeout, store_idle_timeout);
 339 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 340                                 show_sniff_max_interval, store_sniff_max_interval);
 341 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 342                                 show_sniff_min_interval, store_sniff_min_interval);
 343
 344 static struct attribute *bt_host_attrs[] = {
 345         &dev_attr_bus.attr,
 346         &dev_attr_type.attr,
 347         &dev_attr_name.attr,
 348         &dev_attr_class.attr,
 349         &dev_attr_address.attr,
 350         &dev_attr_features.attr,
 351         &dev_attr_manufacturer.attr,
 352         &dev_attr_hci_version.attr,
 353         &dev_attr_hci_revision.attr,
 354         &dev_attr_idle_timeout.attr,
 355         &dev_attr_sniff_max_interval.attr,
 356         &dev_attr_sniff_min_interval.attr,
 357         NULL
 358 };
 359
 360 static struct attribute_group bt_host_group = {
 361         .attrs = bt_host_attrs,
 362 };
 363
 364 static const struct attribute_group *bt_host_groups[] = {
 365         &bt_host_group,
 366         NULL
 367 };
 368
 369 static void bt_host_release(struct device *dev)
 370 {
 371         struct hci_dev *hdev = to_hci_dev(dev);
 372         kfree(hdev);
 373         module_put(THIS_MODULE);
 374 }
 375
 376 static struct device_type bt_host = {
 377         .name    = "host",
 378         .groups  = bt_host_groups,
 379         .release = bt_host_release,
 380 };
 381
 382 static int inquiry_cache_show(struct seq_file *f, void *p)
 383 {
 384         struct hci_dev *hdev = f->private;
 385         struct discovery_state *cache = &hdev->discovery;
 386         struct inquiry_entry *e;
 387
 388         hci_dev_lock(hdev);
 389
 390         list_for_each_entry(e, &cache->all, all) {
 391                 struct inquiry_data *data = &e->data;
 392                 seq_printf(f, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
 393                            batostr(&data->bdaddr),
 394                            data->pscan_rep_mode, data->pscan_period_mode,
 395                            data->pscan_mode, data->dev_class[2],
 396                            data->dev_class[1], data->dev_class[0],
 397                            __le16_to_cpu(data->clock_offset),
 398                            data->rssi, data->ssp_mode, e->timestamp);
 399         }
 400
 401         hci_dev_unlock(hdev);
 402
 403         return 0;
 404 }
 405
 406 static int inquiry_cache_open(struct inode *inode, struct file *file)
 407 {
 408         return single_open(file, inquiry_cache_show, inode->i_private);
 409 }
 410
 411 static const struct file_operations inquiry_cache_fops = {
 412         .open           = inquiry_cache_open,
 413         .read           = seq_read,
 414         .llseek         = seq_lseek,
 415         .release        = single_release,
 416 };
 417
 418 static int blacklist_show(struct seq_file *f, void *p)
 419 {
 420         struct hci_dev *hdev = f->private;
 421         struct bdaddr_list *b;
 422
 423         hci_dev_lock(hdev);
 424
 425         list_for_each_entry(b, &hdev->blacklist, list)
 426                 seq_printf(f, "%s\n", batostr(&b->bdaddr));
 427
 428         hci_dev_unlock(hdev);
 429
 430         return 0;
 431 }
 432
 433 static int blacklist_open(struct inode *inode, struct file *file)
 434 {
 435         return single_open(file, blacklist_show, inode->i_private);
 436 }
 437
 438 static const struct file_operations blacklist_fops = {
 439         .open           = blacklist_open,
 440         .read           = seq_read,
 441         .llseek         = seq_lseek,
 442         .release        = single_release,
 443 };
 444
 445 static void print_bt_uuid(struct seq_file *f, u8 *uuid)
 446 {
 447         __be32 data0, data4;
 448         __be16 data1, data2, data3, data5;
 449
 450         memcpy(&data0, &uuid[0], 4);
 451         memcpy(&data1, &uuid[4], 2);
 452         memcpy(&data2, &uuid[6], 2);
 453         memcpy(&data3, &uuid[8], 2);
 454         memcpy(&data4, &uuid[10], 4);
 455         memcpy(&data5, &uuid[14], 2);
 456
 457         seq_printf(f, "%.8x-%.4x-%.4x-%.4x-%.8x%.4x\n",
 458                                 ntohl(data0), ntohs(data1), ntohs(data2),
 459                                 ntohs(data3), ntohl(data4), ntohs(data5));
 460 }
 461
 462 static int uuids_show(struct seq_file *f, void *p)
 463 {
 464         struct hci_dev *hdev = f->private;
 465         struct bt_uuid *uuid;
 466
 467         hci_dev_lock(hdev);
 468
 469         list_for_each_entry(uuid, &hdev->uuids, list)
 470                 print_bt_uuid(f, uuid->uuid);
 471
 472         hci_dev_unlock(hdev);
 473
 474         return 0;
 475 }
 476
 477 static int uuids_open(struct inode *inode, struct file *file)
 478 {
 479         return single_open(file, uuids_show, inode->i_private);
 480 }
 481
 482 static const struct file_operations uuids_fops = {
 483         .open           = uuids_open,
 484         .read           = seq_read,
 485         .llseek         = seq_lseek,
 486         .release        = single_release,
 487 };
 488
 489 static int auto_accept_delay_set(void *data, u64 val)
 490 {
 491         struct hci_dev *hdev = data;
 492
 493         hci_dev_lock(hdev);
 494
 495         hdev->auto_accept_delay = val;
 496
 497         hci_dev_unlock(hdev);
 498
 499         return 0;
 500 }
 501
 502 static int auto_accept_delay_get(void *data, u64 *val)
 503 {
 504         struct hci_dev *hdev = data;
 505
 506         hci_dev_lock(hdev);
 507
 508         *val = hdev->auto_accept_delay;
 509
 510         hci_dev_unlock(hdev);
 511
 512         return 0;
 513 }
 514
 515 DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get,
 516                                         auto_accept_delay_set, "%llu\n");
 517
 518 void hci_init_sysfs(struct hci_dev *hdev)
 519 {
 520         struct device *dev = &hdev->dev;
 521
 522         dev->type = &bt_host;
 523         dev->class = bt_class;
 524
 525         __module_get(THIS_MODULE);
 526         device_initialize(dev);
 527 }
 528
 529 int hci_add_sysfs(struct hci_dev *hdev)
 530 {
 531         struct device *dev = &hdev->dev;
 532         int err;
 533
 534         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 535
 536         dev_set_name(dev, "%s", hdev->name);
 537
 538         err = device_add(dev);
 539         if (err < 0)
 540                 return err;
 541
 542         if (!bt_debugfs)
 543                 return 0;
 544
 545         hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
 546         if (!hdev->debugfs)
 547                 return 0;
 548
 549         debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
 550                                                 hdev, &inquiry_cache_fops);
 551
 552         debugfs_create_file("blacklist", 0444, hdev->debugfs,
 553                                                 hdev, &blacklist_fops);
 554
 555         debugfs_create_file("uuids", 0444, hdev->debugfs, hdev, &uuids_fops);
 556
 557         debugfs_create_file("auto_accept_delay", 0444, hdev->debugfs, hdev,
 558                                                 &auto_accept_delay_fops);
 559         return 0;
 560 }
 561
 562 void hci_del_sysfs(struct hci_dev *hdev)
 563 {
 564         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 565
 566         debugfs_remove_recursive(hdev->debugfs);
 567
 568         device_del(&hdev->dev);
 569 }
 570
 571 int __init bt_sysfs_init(void)
 572 {
 573         bt_debugfs = debugfs_create_dir("bluetooth", NULL);
 574
 575         bt_class = class_create(THIS_MODULE, "bluetooth");
 576         if (IS_ERR(bt_class))
 577                 return PTR_ERR(bt_class);
 578
 579         return 0;
 580 }
 581
 582 void bt_sysfs_cleanup(void)
 583 {
 584         class_destroy(bt_class);
 585
 586         debugfs_remove_recursive(bt_debugfs);
 587 }