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 = dev_get_drvdata(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 = dev_get_drvdata(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 = dev_get_drvdata(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         void *data = dev_get_drvdata(dev);
  83         kfree(data);
  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 static void add_conn(struct work_struct *work)
  93 {
  94         struct hci_conn *conn = container_of(work, struct hci_conn, work_add);
  95         struct hci_dev *hdev = conn->hdev;
  96
  97         dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
  98
  99         dev_set_drvdata(&conn->dev, conn);
 100
 101         if (device_add(&conn->dev) < 0) {
 102                 BT_ERR("Failed to register connection device");
 103                 return;
 104         }
 105
 106         hci_dev_hold(hdev);
 107 }
 108
 109 /*
 110  * The rfcomm tty device will possibly retain even when conn
 111  * is down, and sysfs doesn't support move zombie device,
 112  * so we should move the device before conn device is destroyed.
 113  */
 114 static int __match_tty(struct device *dev, void *data)
 115 {
 116         return !strncmp(dev_name(dev), "rfcomm", 6);
 117 }
 118
 119 static void del_conn(struct work_struct *work)
 120 {
 121         struct hci_conn *conn = container_of(work, struct hci_conn, work_del);
 122         struct hci_dev *hdev = conn->hdev;
 123
 124         if (!device_is_registered(&conn->dev))
 125                 return;
 126
 127         while (1) {
 128                 struct device *dev;
 129
 130                 dev = device_find_child(&conn->dev, NULL, __match_tty);
 131                 if (!dev)
 132                         break;
 133                 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
 134                 put_device(dev);
 135         }
 136
 137         device_del(&conn->dev);
 138         put_device(&conn->dev);
 139
 140         hci_dev_put(hdev);
 141 }
 142
 143 void hci_conn_init_sysfs(struct hci_conn *conn)
 144 {
 145         struct hci_dev *hdev = conn->hdev;
 146
 147         BT_DBG("conn %p", conn);
 148
 149         conn->dev.type = &bt_link;
 150         conn->dev.class = bt_class;
 151         conn->dev.parent = &hdev->dev;
 152
 153         device_initialize(&conn->dev);
 154
 155         INIT_WORK(&conn->work_add, add_conn);
 156         INIT_WORK(&conn->work_del, del_conn);
 157 }
 158
 159 void hci_conn_add_sysfs(struct hci_conn *conn)
 160 {
 161         BT_DBG("conn %p", conn);
 162
 163         queue_work(conn->hdev->workqueue, &conn->work_add);
 164 }
 165
 166 void hci_conn_del_sysfs(struct hci_conn *conn)
 167 {
 168         BT_DBG("conn %p", conn);
 169
 170         queue_work(conn->hdev->workqueue, &conn->work_del);
 171 }
 172
 173 static inline char *host_bustostr(int bus)
 174 {
 175         switch (bus) {
 176         case HCI_VIRTUAL:
 177                 return "VIRTUAL";
 178         case HCI_USB:
 179                 return "USB";
 180         case HCI_PCCARD:
 181                 return "PCCARD";
 182         case HCI_UART:
 183                 return "UART";
 184         case HCI_RS232:
 185                 return "RS232";
 186         case HCI_PCI:
 187                 return "PCI";
 188         case HCI_SDIO:
 189                 return "SDIO";
 190         default:
 191                 return "UNKNOWN";
 192         }
 193 }
 194
 195 static inline char *host_typetostr(int type)
 196 {
 197         switch (type) {
 198         case HCI_BREDR:
 199                 return "BR/EDR";
 200         case HCI_AMP:
 201                 return "AMP";
 202         default:
 203                 return "UNKNOWN";
 204         }
 205 }
 206
 207 static ssize_t show_bus(struct device *dev, struct device_attribute *attr, char *buf)
 208 {
 209         struct hci_dev *hdev = dev_get_drvdata(dev);
 210         return sprintf(buf, "%s\n", host_bustostr(hdev->bus));
 211 }
 212
 213 static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
 214 {
 215         struct hci_dev *hdev = dev_get_drvdata(dev);
 216         return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type));
 217 }
 218
 219 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
 220 {
 221         struct hci_dev *hdev = dev_get_drvdata(dev);
 222         char name[HCI_MAX_NAME_LENGTH + 1];
 223         int i;
 224
 225         for (i = 0; i < HCI_MAX_NAME_LENGTH; i++)
 226                 name[i] = hdev->dev_name[i];
 227
 228         name[HCI_MAX_NAME_LENGTH] = '\0';
 229         return sprintf(buf, "%s\n", name);
 230 }
 231
 232 static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
 233 {
 234         struct hci_dev *hdev = dev_get_drvdata(dev);
 235         return sprintf(buf, "0x%.2x%.2x%.2x\n",
 236                         hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
 237 }
 238
 239 static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
 240 {
 241         struct hci_dev *hdev = dev_get_drvdata(dev);
 242         return sprintf(buf, "%s\n", batostr(&hdev->bdaddr));
 243 }
 244
 245 static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
 246 {
 247         struct hci_dev *hdev = dev_get_drvdata(dev);
 248
 249         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 250                                 hdev->features[0], hdev->features[1],
 251                                 hdev->features[2], hdev->features[3],
 252                                 hdev->features[4], hdev->features[5],
 253                                 hdev->features[6], hdev->features[7]);
 254 }
 255
 256 static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
 257 {
 258         struct hci_dev *hdev = dev_get_drvdata(dev);
 259         return sprintf(buf, "%d\n", hdev->manufacturer);
 260 }
 261
 262 static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
 263 {
 264         struct hci_dev *hdev = dev_get_drvdata(dev);
 265         return sprintf(buf, "%d\n", hdev->hci_ver);
 266 }
 267
 268 static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
 269 {
 270         struct hci_dev *hdev = dev_get_drvdata(dev);
 271         return sprintf(buf, "%d\n", hdev->hci_rev);
 272 }
 273
 274 static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 275 {
 276         struct hci_dev *hdev = dev_get_drvdata(dev);
 277         return sprintf(buf, "%d\n", hdev->idle_timeout);
 278 }
 279
 280 static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 281 {
 282         struct hci_dev *hdev = dev_get_drvdata(dev);
 283         unsigned int val;
 284         int rv;
 285
 286         rv = kstrtouint(buf, 0, &val);
 287         if (rv < 0)
 288                 return rv;
 289
 290         if (val != 0 && (val < 500 || val > 3600000))
 291                 return -EINVAL;
 292
 293         hdev->idle_timeout = val;
 294
 295         return count;
 296 }
 297
 298 static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
 299 {
 300         struct hci_dev *hdev = dev_get_drvdata(dev);
 301         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 302 }
 303
 304 static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 305 {
 306         struct hci_dev *hdev = dev_get_drvdata(dev);
 307         u16 val;
 308         int rv;
 309
 310         rv = kstrtou16(buf, 0, &val);
 311         if (rv < 0)
 312                 return rv;
 313
 314         if (val == 0 || val % 2 || val < hdev->sniff_min_interval)
 315                 return -EINVAL;
 316
 317         hdev->sniff_max_interval = val;
 318
 319         return count;
 320 }
 321
 322 static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
 323 {
 324         struct hci_dev *hdev = dev_get_drvdata(dev);
 325         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 326 }
 327
 328 static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 329 {
 330         struct hci_dev *hdev = dev_get_drvdata(dev);
 331         u16 val;
 332         int rv;
 333
 334         rv = kstrtou16(buf, 0, &val);
 335         if (rv < 0)
 336                 return rv;
 337
 338         if (val == 0 || val % 2 || val > hdev->sniff_max_interval)
 339                 return -EINVAL;
 340
 341         hdev->sniff_min_interval = val;
 342
 343         return count;
 344 }
 345
 346 static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL);
 347 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 348 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 349 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 350 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 351 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 352 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 353 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 354 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 355
 356 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 357                                 show_idle_timeout, store_idle_timeout);
 358 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 359                                 show_sniff_max_interval, store_sniff_max_interval);
 360 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 361                                 show_sniff_min_interval, store_sniff_min_interval);
 362
 363 static struct attribute *bt_host_attrs[] = {
 364         &dev_attr_bus.attr,
 365         &dev_attr_type.attr,
 366         &dev_attr_name.attr,
 367         &dev_attr_class.attr,
 368         &dev_attr_address.attr,
 369         &dev_attr_features.attr,
 370         &dev_attr_manufacturer.attr,
 371         &dev_attr_hci_version.attr,
 372         &dev_attr_hci_revision.attr,
 373         &dev_attr_idle_timeout.attr,
 374         &dev_attr_sniff_max_interval.attr,
 375         &dev_attr_sniff_min_interval.attr,
 376         NULL
 377 };
 378
 379 static struct attribute_group bt_host_group = {
 380         .attrs = bt_host_attrs,
 381 };
 382
 383 static const struct attribute_group *bt_host_groups[] = {
 384         &bt_host_group,
 385         NULL
 386 };
 387
 388 static void bt_host_release(struct device *dev)
 389 {
 390         void *data = dev_get_drvdata(dev);
 391         kfree(data);
 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 inquiry_cache *cache = &hdev->inq_cache;
 404         struct inquiry_entry *e;
 405
 406         hci_dev_lock_bh(hdev);
 407
 408         for (e = cache->list; e; e = e->next) {
 409                 struct inquiry_data *data = &e->data;
 410                 seq_printf(f, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
 411                            batostr(&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_bh(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 list_head *l;
 440
 441         hci_dev_lock_bh(hdev);
 442
 443         list_for_each(l, &hdev->blacklist) {
 444                 struct bdaddr_list *b;
 445
 446                 b = list_entry(l, struct bdaddr_list, list);
 447
 448                 seq_printf(f, "%s\n", batostr(&b->bdaddr));
 449         }
 450
 451         hci_dev_unlock_bh(hdev);
 452
 453         return 0;
 454 }
 455
 456 static int blacklist_open(struct inode *inode, struct file *file)
 457 {
 458         return single_open(file, blacklist_show, inode->i_private);
 459 }
 460
 461 static const struct file_operations blacklist_fops = {
 462         .open           = blacklist_open,
 463         .read           = seq_read,
 464         .llseek         = seq_lseek,
 465         .release        = single_release,
 466 };
 467
 468 static void print_bt_uuid(struct seq_file *f, u8 *uuid)
 469 {
 470         u32 data0, data4;
 471         u16 data1, data2, data3, data5;
 472
 473         memcpy(&data0, &uuid[0], 4);
 474         memcpy(&data1, &uuid[4], 2);
 475         memcpy(&data2, &uuid[6], 2);
 476         memcpy(&data3, &uuid[8], 2);
 477         memcpy(&data4, &uuid[10], 4);
 478         memcpy(&data5, &uuid[14], 2);
 479
 480         seq_printf(f, "%.8x-%.4x-%.4x-%.4x-%.8x%.4x\n",
 481                                 ntohl(data0), ntohs(data1), ntohs(data2),
 482                                 ntohs(data3), ntohl(data4), ntohs(data5));
 483 }
 484
 485 static int uuids_show(struct seq_file *f, void *p)
 486 {
 487         struct hci_dev *hdev = f->private;
 488         struct list_head *l;
 489
 490         hci_dev_lock_bh(hdev);
 491
 492         list_for_each(l, &hdev->uuids) {
 493                 struct bt_uuid *uuid;
 494
 495                 uuid = list_entry(l, struct bt_uuid, list);
 496
 497                 print_bt_uuid(f, uuid->uuid);
 498         }
 499
 500         hci_dev_unlock_bh(hdev);
 501
 502         return 0;
 503 }
 504
 505 static int uuids_open(struct inode *inode, struct file *file)
 506 {
 507         return single_open(file, uuids_show, inode->i_private);
 508 }
 509
 510 static const struct file_operations uuids_fops = {
 511         .open           = uuids_open,
 512         .read           = seq_read,
 513         .llseek         = seq_lseek,
 514         .release        = single_release,
 515 };
 516
 517 static int auto_accept_delay_set(void *data, u64 val)
 518 {
 519         struct hci_dev *hdev = data;
 520
 521         hci_dev_lock_bh(hdev);
 522
 523         hdev->auto_accept_delay = val;
 524
 525         hci_dev_unlock_bh(hdev);
 526
 527         return 0;
 528 }
 529
 530 static int auto_accept_delay_get(void *data, u64 *val)
 531 {
 532         struct hci_dev *hdev = data;
 533
 534         hci_dev_lock_bh(hdev);
 535
 536         *val = hdev->auto_accept_delay;
 537
 538         hci_dev_unlock_bh(hdev);
 539
 540         return 0;
 541 }
 542
 543 DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get,
 544                                         auto_accept_delay_set, "%llu\n");
 545
 546 int hci_register_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->type = &bt_host;
 554         dev->class = bt_class;
 555         dev->parent = hdev->parent;
 556
 557         dev_set_name(dev, "%s", hdev->name);
 558
 559         dev_set_drvdata(dev, hdev);
 560
 561         err = device_register(dev);
 562         if (err < 0)
 563                 return err;
 564
 565         if (!bt_debugfs)
 566                 return 0;
 567
 568         hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
 569         if (!hdev->debugfs)
 570                 return 0;
 571
 572         debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
 573                                                 hdev, &inquiry_cache_fops);
 574
 575         debugfs_create_file("blacklist", 0444, hdev->debugfs,
 576                                                 hdev, &blacklist_fops);
 577
 578         debugfs_create_file("uuids", 0444, hdev->debugfs, hdev, &uuids_fops);
 579
 580         debugfs_create_file("auto_accept_delay", 0444, hdev->debugfs, hdev,
 581                                                 &auto_accept_delay_fops);
 582         return 0;
 583 }
 584
 585 void hci_unregister_sysfs(struct hci_dev *hdev)
 586 {
 587         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 588
 589         debugfs_remove_recursive(hdev->debugfs);
 590
 591         device_del(&hdev->dev);
 592 }
 593
 594 int __init bt_sysfs_init(void)
 595 {
 596         bt_debugfs = debugfs_create_dir("bluetooth", NULL);
 597
 598         bt_class = class_create(THIS_MODULE, "bluetooth");
 599         if (IS_ERR(bt_class))
 600                 return PTR_ERR(bt_class);
 601
 602         return 0;
 603 }
 604
 605 void bt_sysfs_cleanup(void)
 606 {
 607         class_destroy(bt_class);
 608
 609         debugfs_remove_recursive(bt_debugfs);
 610 }