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][0], conn->features[0][1],
  52                        conn->features[0][2], conn->features[0][3],
  53                        conn->features[0][4], conn->features[0][5],
  54                        conn->features[0][6], conn->features[0][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
 150         hci_dev_put(hdev);
 151 }
 152
 153 static inline char *host_bustostr(int bus)
 154 {
 155         switch (bus) {
 156         case HCI_VIRTUAL:
 157                 return "VIRTUAL";
 158         case HCI_USB:
 159                 return "USB";
 160         case HCI_PCCARD:
 161                 return "PCCARD";
 162         case HCI_UART:
 163                 return "UART";
 164         case HCI_RS232:
 165                 return "RS232";
 166         case HCI_PCI:
 167                 return "PCI";
 168         case HCI_SDIO:
 169                 return "SDIO";
 170         default:
 171                 return "UNKNOWN";
 172         }
 173 }
 174
 175 static inline char *host_typetostr(int type)
 176 {
 177         switch (type) {
 178         case HCI_BREDR:
 179                 return "BR/EDR";
 180         case HCI_AMP:
 181                 return "AMP";
 182         default:
 183                 return "UNKNOWN";
 184         }
 185 }
 186
 187 static ssize_t show_bus(struct device *dev,
 188                         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,
 195                          struct device_attribute *attr, char *buf)
 196 {
 197         struct hci_dev *hdev = to_hci_dev(dev);
 198         return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type));
 199 }
 200
 201 static ssize_t show_name(struct device *dev,
 202                          struct device_attribute *attr, char *buf)
 203 {
 204         struct hci_dev *hdev = to_hci_dev(dev);
 205         char name[HCI_MAX_NAME_LENGTH + 1];
 206         int i;
 207
 208         for (i = 0; i < HCI_MAX_NAME_LENGTH; i++)
 209                 name[i] = hdev->dev_name[i];
 210
 211         name[HCI_MAX_NAME_LENGTH] = '\0';
 212         return sprintf(buf, "%s\n", name);
 213 }
 214
 215 static ssize_t show_class(struct device *dev,
 216                           struct device_attribute *attr, char *buf)
 217 {
 218         struct hci_dev *hdev = to_hci_dev(dev);
 219         return sprintf(buf, "0x%.2x%.2x%.2x\n", hdev->dev_class[2],
 220                        hdev->dev_class[1], hdev->dev_class[0]);
 221 }
 222
 223 static ssize_t show_address(struct device *dev,
 224                             struct device_attribute *attr, char *buf)
 225 {
 226         struct hci_dev *hdev = to_hci_dev(dev);
 227         return sprintf(buf, "%pMR\n", &hdev->bdaddr);
 228 }
 229
 230 static ssize_t show_features(struct device *dev,
 231                              struct device_attribute *attr, char *buf)
 232 {
 233         struct hci_dev *hdev = to_hci_dev(dev);
 234
 235         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 236                        hdev->features[0][0], hdev->features[0][1],
 237                        hdev->features[0][2], hdev->features[0][3],
 238                        hdev->features[0][4], hdev->features[0][5],
 239                        hdev->features[0][6], hdev->features[0][7]);
 240 }
 241
 242 static ssize_t show_manufacturer(struct device *dev,
 243                                  struct device_attribute *attr, char *buf)
 244 {
 245         struct hci_dev *hdev = to_hci_dev(dev);
 246         return sprintf(buf, "%d\n", hdev->manufacturer);
 247 }
 248
 249 static ssize_t show_hci_version(struct device *dev,
 250                                 struct device_attribute *attr, char *buf)
 251 {
 252         struct hci_dev *hdev = to_hci_dev(dev);
 253         return sprintf(buf, "%d\n", hdev->hci_ver);
 254 }
 255
 256 static ssize_t show_hci_revision(struct device *dev,
 257                                  struct device_attribute *attr, char *buf)
 258 {
 259         struct hci_dev *hdev = to_hci_dev(dev);
 260         return sprintf(buf, "%d\n", hdev->hci_rev);
 261 }
 262
 263 static ssize_t show_idle_timeout(struct device *dev,
 264                                  struct device_attribute *attr, char *buf)
 265 {
 266         struct hci_dev *hdev = to_hci_dev(dev);
 267         return sprintf(buf, "%d\n", hdev->idle_timeout);
 268 }
 269
 270 static ssize_t store_idle_timeout(struct device *dev,
 271                                   struct device_attribute *attr,
 272                                   const char *buf, size_t count)
 273 {
 274         struct hci_dev *hdev = to_hci_dev(dev);
 275         unsigned int val;
 276         int rv;
 277
 278         rv = kstrtouint(buf, 0, &val);
 279         if (rv < 0)
 280                 return rv;
 281
 282         if (val != 0 && (val < 500 || val > 3600000))
 283                 return -EINVAL;
 284
 285         hdev->idle_timeout = val;
 286
 287         return count;
 288 }
 289
 290 static ssize_t show_sniff_max_interval(struct device *dev,
 291                                        struct device_attribute *attr, char *buf)
 292 {
 293         struct hci_dev *hdev = to_hci_dev(dev);
 294         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 295 }
 296
 297 static ssize_t store_sniff_max_interval(struct device *dev,
 298                                         struct device_attribute *attr,
 299                                         const char *buf, size_t count)
 300 {
 301         struct hci_dev *hdev = to_hci_dev(dev);
 302         u16 val;
 303         int rv;
 304
 305         rv = kstrtou16(buf, 0, &val);
 306         if (rv < 0)
 307                 return rv;
 308
 309         if (val == 0 || val % 2 || val < hdev->sniff_min_interval)
 310                 return -EINVAL;
 311
 312         hdev->sniff_max_interval = val;
 313
 314         return count;
 315 }
 316
 317 static ssize_t show_sniff_min_interval(struct device *dev,
 318                                        struct device_attribute *attr, char *buf)
 319 {
 320         struct hci_dev *hdev = to_hci_dev(dev);
 321         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 322 }
 323
 324 static ssize_t store_sniff_min_interval(struct device *dev,
 325                                         struct device_attribute *attr,
 326                                         const char *buf, size_t count)
 327 {
 328         struct hci_dev *hdev = to_hci_dev(dev);
 329         u16 val;
 330         int rv;
 331
 332         rv = kstrtou16(buf, 0, &val);
 333         if (rv < 0)
 334                 return rv;
 335
 336         if (val == 0 || val % 2 || val > hdev->sniff_max_interval)
 337                 return -EINVAL;
 338
 339         hdev->sniff_min_interval = val;
 340
 341         return count;
 342 }
 343
 344 static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL);
 345 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 346 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 347 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 348 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 349 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 350 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 351 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 352 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 353
 354 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 355                    show_idle_timeout, store_idle_timeout);
 356 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 357                    show_sniff_max_interval, store_sniff_max_interval);
 358 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 359                    show_sniff_min_interval, store_sniff_min_interval);
 360
 361 static struct attribute *bt_host_attrs[] = {
 362         &dev_attr_bus.attr,
 363         &dev_attr_type.attr,
 364         &dev_attr_name.attr,
 365         &dev_attr_class.attr,
 366         &dev_attr_address.attr,
 367         &dev_attr_features.attr,
 368         &dev_attr_manufacturer.attr,
 369         &dev_attr_hci_version.attr,
 370         &dev_attr_hci_revision.attr,
 371         &dev_attr_idle_timeout.attr,
 372         &dev_attr_sniff_max_interval.attr,
 373         &dev_attr_sniff_min_interval.attr,
 374         NULL
 375 };
 376
 377 static struct attribute_group bt_host_group = {
 378         .attrs = bt_host_attrs,
 379 };
 380
 381 static const struct attribute_group *bt_host_groups[] = {
 382         &bt_host_group,
 383         NULL
 384 };
 385
 386 static void bt_host_release(struct device *dev)
 387 {
 388         struct hci_dev *hdev = to_hci_dev(dev);
 389         kfree(hdev);
 390         module_put(THIS_MODULE);
 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 blacklist_show(struct seq_file *f, void *p)
 400 {
 401         struct hci_dev *hdev = f->private;
 402         struct bdaddr_list *b;
 403
 404         hci_dev_lock(hdev);
 405
 406         list_for_each_entry(b, &hdev->blacklist, list)
 407                 seq_printf(f, "%pMR\n", &b->bdaddr);
 408
 409         hci_dev_unlock(hdev);
 410
 411         return 0;
 412 }
 413
 414 static int blacklist_open(struct inode *inode, struct file *file)
 415 {
 416         return single_open(file, blacklist_show, inode->i_private);
 417 }
 418
 419 static const struct file_operations blacklist_fops = {
 420         .open           = blacklist_open,
 421         .read           = seq_read,
 422         .llseek         = seq_lseek,
 423         .release        = single_release,
 424 };
 425
 426 static void print_bt_uuid(struct seq_file *f, u8 *uuid)
 427 {
 428         u32 data0, data5;
 429         u16 data1, data2, data3, data4;
 430
 431         data5 = get_unaligned_le32(uuid);
 432         data4 = get_unaligned_le16(uuid + 4);
 433         data3 = get_unaligned_le16(uuid + 6);
 434         data2 = get_unaligned_le16(uuid + 8);
 435         data1 = get_unaligned_le16(uuid + 10);
 436         data0 = get_unaligned_le32(uuid + 12);
 437
 438         seq_printf(f, "%.8x-%.4x-%.4x-%.4x-%.4x%.8x\n",
 439                    data0, data1, data2, data3, data4, data5);
 440 }
 441
 442 static int uuids_show(struct seq_file *f, void *p)
 443 {
 444         struct hci_dev *hdev = f->private;
 445         struct bt_uuid *uuid;
 446
 447         hci_dev_lock(hdev);
 448
 449         list_for_each_entry(uuid, &hdev->uuids, list)
 450                 print_bt_uuid(f, uuid->uuid);
 451
 452         hci_dev_unlock(hdev);
 453
 454         return 0;
 455 }
 456
 457 static int uuids_open(struct inode *inode, struct file *file)
 458 {
 459         return single_open(file, uuids_show, inode->i_private);
 460 }
 461
 462 static const struct file_operations uuids_fops = {
 463         .open           = uuids_open,
 464         .read           = seq_read,
 465         .llseek         = seq_lseek,
 466         .release        = single_release,
 467 };
 468
 469 static int auto_accept_delay_set(void *data, u64 val)
 470 {
 471         struct hci_dev *hdev = data;
 472
 473         hci_dev_lock(hdev);
 474
 475         hdev->auto_accept_delay = val;
 476
 477         hci_dev_unlock(hdev);
 478
 479         return 0;
 480 }
 481
 482 static int auto_accept_delay_get(void *data, u64 *val)
 483 {
 484         struct hci_dev *hdev = data;
 485
 486         hci_dev_lock(hdev);
 487
 488         *val = hdev->auto_accept_delay;
 489
 490         hci_dev_unlock(hdev);
 491
 492         return 0;
 493 }
 494
 495 DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get,
 496                         auto_accept_delay_set, "%llu\n");
 497
 498 void hci_init_sysfs(struct hci_dev *hdev)
 499 {
 500         struct device *dev = &hdev->dev;
 501
 502         dev->type = &bt_host;
 503         dev->class = bt_class;
 504
 505         __module_get(THIS_MODULE);
 506         device_initialize(dev);
 507 }
 508
 509 int hci_add_sysfs(struct hci_dev *hdev)
 510 {
 511         struct device *dev = &hdev->dev;
 512         int err;
 513
 514         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 515
 516         dev_set_name(dev, "%s", hdev->name);
 517
 518         err = device_add(dev);
 519         if (err < 0)
 520                 return err;
 521
 522         if (!bt_debugfs)
 523                 return 0;
 524
 525         hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
 526         if (!hdev->debugfs)
 527                 return 0;
 528
 529         debugfs_create_file("blacklist", 0444, hdev->debugfs,
 530                             hdev, &blacklist_fops);
 531
 532         debugfs_create_file("uuids", 0444, hdev->debugfs, hdev, &uuids_fops);
 533
 534         debugfs_create_file("auto_accept_delay", 0444, hdev->debugfs, hdev,
 535                             &auto_accept_delay_fops);
 536         return 0;
 537 }
 538
 539 void hci_del_sysfs(struct hci_dev *hdev)
 540 {
 541         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 542
 543         debugfs_remove_recursive(hdev->debugfs);
 544
 545         device_del(&hdev->dev);
 546 }
 547
 548 int __init bt_sysfs_init(void)
 549 {
 550         bt_debugfs = debugfs_create_dir("bluetooth", NULL);
 551
 552         bt_class = class_create(THIS_MODULE, "bluetooth");
 553
 554         return PTR_ERR_OR_ZERO(bt_class);
 555 }
 556
 557 void bt_sysfs_cleanup(void)
 558 {
 559         class_destroy(bt_class);
 560
 561         debugfs_remove_recursive(bt_debugfs);
 562 }