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 /*
  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         dev_set_drvdata(&conn->dev, conn);
 124
 125         if (device_add(&conn->dev) < 0) {
 126                 BT_ERR("Failed to register connection device");
 127                 return;
 128         }
 129
 130         hci_dev_hold(hdev);
 131 }
 132
 133 void hci_conn_del_sysfs(struct hci_conn *conn)
 134 {
 135         struct hci_dev *hdev = conn->hdev;
 136
 137         if (!device_is_registered(&conn->dev))
 138                 return;
 139
 140         while (1) {
 141                 struct device *dev;
 142
 143                 dev = device_find_child(&conn->dev, NULL, __match_tty);
 144                 if (!dev)
 145                         break;
 146                 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
 147                 put_device(dev);
 148         }
 149
 150         device_del(&conn->dev);
 151         put_device(&conn->dev);
 152
 153         hci_dev_put(hdev);
 154 }
 155
 156 static inline char *host_bustostr(int bus)
 157 {
 158         switch (bus) {
 159         case HCI_VIRTUAL:
 160                 return "VIRTUAL";
 161         case HCI_USB:
 162                 return "USB";
 163         case HCI_PCCARD:
 164                 return "PCCARD";
 165         case HCI_UART:
 166                 return "UART";
 167         case HCI_RS232:
 168                 return "RS232";
 169         case HCI_PCI:
 170                 return "PCI";
 171         case HCI_SDIO:
 172                 return "SDIO";
 173         default:
 174                 return "UNKNOWN";
 175         }
 176 }
 177
 178 static inline char *host_typetostr(int type)
 179 {
 180         switch (type) {
 181         case HCI_BREDR:
 182                 return "BR/EDR";
 183         case HCI_AMP:
 184                 return "AMP";
 185         default:
 186                 return "UNKNOWN";
 187         }
 188 }
 189
 190 static ssize_t show_bus(struct device *dev, struct device_attribute *attr, char *buf)
 191 {
 192         struct hci_dev *hdev = dev_get_drvdata(dev);
 193         return sprintf(buf, "%s\n", host_bustostr(hdev->bus));
 194 }
 195
 196 static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
 197 {
 198         struct hci_dev *hdev = dev_get_drvdata(dev);
 199         return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type));
 200 }
 201
 202 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
 203 {
 204         struct hci_dev *hdev = dev_get_drvdata(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, struct device_attribute *attr, char *buf)
 216 {
 217         struct hci_dev *hdev = dev_get_drvdata(dev);
 218         return sprintf(buf, "0x%.2x%.2x%.2x\n",
 219                         hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
 220 }
 221
 222 static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
 223 {
 224         struct hci_dev *hdev = dev_get_drvdata(dev);
 225         return sprintf(buf, "%s\n", batostr(&hdev->bdaddr));
 226 }
 227
 228 static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
 229 {
 230         struct hci_dev *hdev = dev_get_drvdata(dev);
 231
 232         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 233                                 hdev->features[0], hdev->features[1],
 234                                 hdev->features[2], hdev->features[3],
 235                                 hdev->features[4], hdev->features[5],
 236                                 hdev->features[6], hdev->features[7]);
 237 }
 238
 239 static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
 240 {
 241         struct hci_dev *hdev = dev_get_drvdata(dev);
 242         return sprintf(buf, "%d\n", hdev->manufacturer);
 243 }
 244
 245 static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
 246 {
 247         struct hci_dev *hdev = dev_get_drvdata(dev);
 248         return sprintf(buf, "%d\n", hdev->hci_ver);
 249 }
 250
 251 static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
 252 {
 253         struct hci_dev *hdev = dev_get_drvdata(dev);
 254         return sprintf(buf, "%d\n", hdev->hci_rev);
 255 }
 256
 257 static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 258 {
 259         struct hci_dev *hdev = dev_get_drvdata(dev);
 260         return sprintf(buf, "%d\n", hdev->idle_timeout);
 261 }
 262
 263 static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 264 {
 265         struct hci_dev *hdev = dev_get_drvdata(dev);
 266         unsigned int val;
 267         int rv;
 268
 269         rv = kstrtouint(buf, 0, &val);
 270         if (rv < 0)
 271                 return rv;
 272
 273         if (val != 0 && (val < 500 || val > 3600000))
 274                 return -EINVAL;
 275
 276         hdev->idle_timeout = val;
 277
 278         return count;
 279 }
 280
 281 static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
 282 {
 283         struct hci_dev *hdev = dev_get_drvdata(dev);
 284         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 285 }
 286
 287 static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 288 {
 289         struct hci_dev *hdev = dev_get_drvdata(dev);
 290         u16 val;
 291         int rv;
 292
 293         rv = kstrtou16(buf, 0, &val);
 294         if (rv < 0)
 295                 return rv;
 296
 297         if (val == 0 || val % 2 || val < hdev->sniff_min_interval)
 298                 return -EINVAL;
 299
 300         hdev->sniff_max_interval = val;
 301
 302         return count;
 303 }
 304
 305 static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
 306 {
 307         struct hci_dev *hdev = dev_get_drvdata(dev);
 308         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 309 }
 310
 311 static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 312 {
 313         struct hci_dev *hdev = dev_get_drvdata(dev);
 314         u16 val;
 315         int rv;
 316
 317         rv = kstrtou16(buf, 0, &val);
 318         if (rv < 0)
 319                 return rv;
 320
 321         if (val == 0 || val % 2 || val > hdev->sniff_max_interval)
 322                 return -EINVAL;
 323
 324         hdev->sniff_min_interval = val;
 325
 326         return count;
 327 }
 328
 329 static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL);
 330 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 331 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 332 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 333 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 334 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 335 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 336 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 337 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 338
 339 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 340                                 show_idle_timeout, store_idle_timeout);
 341 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 342                                 show_sniff_max_interval, store_sniff_max_interval);
 343 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 344                                 show_sniff_min_interval, store_sniff_min_interval);
 345
 346 static struct attribute *bt_host_attrs[] = {
 347         &dev_attr_bus.attr,
 348         &dev_attr_type.attr,
 349         &dev_attr_name.attr,
 350         &dev_attr_class.attr,
 351         &dev_attr_address.attr,
 352         &dev_attr_features.attr,
 353         &dev_attr_manufacturer.attr,
 354         &dev_attr_hci_version.attr,
 355         &dev_attr_hci_revision.attr,
 356         &dev_attr_idle_timeout.attr,
 357         &dev_attr_sniff_max_interval.attr,
 358         &dev_attr_sniff_min_interval.attr,
 359         NULL
 360 };
 361
 362 static struct attribute_group bt_host_group = {
 363         .attrs = bt_host_attrs,
 364 };
 365
 366 static const struct attribute_group *bt_host_groups[] = {
 367         &bt_host_group,
 368         NULL
 369 };
 370
 371 static void bt_host_release(struct device *dev)
 372 {
 373         void *data = dev_get_drvdata(dev);
 374         kfree(data);
 375         module_put(THIS_MODULE);
 376 }
 377
 378 static struct device_type bt_host = {
 379         .name    = "host",
 380         .groups  = bt_host_groups,
 381         .release = bt_host_release,
 382 };
 383
 384 static int inquiry_cache_show(struct seq_file *f, void *p)
 385 {
 386         struct hci_dev *hdev = f->private;
 387         struct discovery_state *cache = &hdev->discovery;
 388         struct inquiry_entry *e;
 389
 390         hci_dev_lock(hdev);
 391
 392         list_for_each_entry(e, &cache->all, all) {
 393                 struct inquiry_data *data = &e->data;
 394                 seq_printf(f, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
 395                            batostr(&data->bdaddr),
 396                            data->pscan_rep_mode, data->pscan_period_mode,
 397                            data->pscan_mode, data->dev_class[2],
 398                            data->dev_class[1], data->dev_class[0],
 399                            __le16_to_cpu(data->clock_offset),
 400                            data->rssi, data->ssp_mode, e->timestamp);
 401         }
 402
 403         hci_dev_unlock(hdev);
 404
 405         return 0;
 406 }
 407
 408 static int inquiry_cache_open(struct inode *inode, struct file *file)
 409 {
 410         return single_open(file, inquiry_cache_show, inode->i_private);
 411 }
 412
 413 static const struct file_operations inquiry_cache_fops = {
 414         .open           = inquiry_cache_open,
 415         .read           = seq_read,
 416         .llseek         = seq_lseek,
 417         .release        = single_release,
 418 };
 419
 420 static int blacklist_show(struct seq_file *f, void *p)
 421 {
 422         struct hci_dev *hdev = f->private;
 423         struct bdaddr_list *b;
 424
 425         hci_dev_lock(hdev);
 426
 427         list_for_each_entry(b, &hdev->blacklist, list)
 428                 seq_printf(f, "%s\n", batostr(&b->bdaddr));
 429
 430         hci_dev_unlock(hdev);
 431
 432         return 0;
 433 }
 434
 435 static int blacklist_open(struct inode *inode, struct file *file)
 436 {
 437         return single_open(file, blacklist_show, inode->i_private);
 438 }
 439
 440 static const struct file_operations blacklist_fops = {
 441         .open           = blacklist_open,
 442         .read           = seq_read,
 443         .llseek         = seq_lseek,
 444         .release        = single_release,
 445 };
 446
 447 static void print_bt_uuid(struct seq_file *f, u8 *uuid)
 448 {
 449         u32 data0, data4;
 450         u16 data1, data2, data3, data5;
 451
 452         memcpy(&data0, &uuid[0], 4);
 453         memcpy(&data1, &uuid[4], 2);
 454         memcpy(&data2, &uuid[6], 2);
 455         memcpy(&data3, &uuid[8], 2);
 456         memcpy(&data4, &uuid[10], 4);
 457         memcpy(&data5, &uuid[14], 2);
 458
 459         seq_printf(f, "%.8x-%.4x-%.4x-%.4x-%.8x%.4x\n",
 460                                 ntohl(data0), ntohs(data1), ntohs(data2),
 461                                 ntohs(data3), ntohl(data4), ntohs(data5));
 462 }
 463
 464 static int uuids_show(struct seq_file *f, void *p)
 465 {
 466         struct hci_dev *hdev = f->private;
 467         struct bt_uuid *uuid;
 468
 469         hci_dev_lock(hdev);
 470
 471         list_for_each_entry(uuid, &hdev->uuids, list)
 472                 print_bt_uuid(f, uuid->uuid);
 473
 474         hci_dev_unlock(hdev);
 475
 476         return 0;
 477 }
 478
 479 static int uuids_open(struct inode *inode, struct file *file)
 480 {
 481         return single_open(file, uuids_show, inode->i_private);
 482 }
 483
 484 static const struct file_operations uuids_fops = {
 485         .open           = uuids_open,
 486         .read           = seq_read,
 487         .llseek         = seq_lseek,
 488         .release        = single_release,
 489 };
 490
 491 static int auto_accept_delay_set(void *data, u64 val)
 492 {
 493         struct hci_dev *hdev = data;
 494
 495         hci_dev_lock(hdev);
 496
 497         hdev->auto_accept_delay = val;
 498
 499         hci_dev_unlock(hdev);
 500
 501         return 0;
 502 }
 503
 504 static int auto_accept_delay_get(void *data, u64 *val)
 505 {
 506         struct hci_dev *hdev = data;
 507
 508         hci_dev_lock(hdev);
 509
 510         *val = hdev->auto_accept_delay;
 511
 512         hci_dev_unlock(hdev);
 513
 514         return 0;
 515 }
 516
 517 DEFINE_SIMPLE_ATTRIBUTE(auto_accept_delay_fops, auto_accept_delay_get,
 518                                         auto_accept_delay_set, "%llu\n");
 519
 520 void hci_init_sysfs(struct hci_dev *hdev)
 521 {
 522         struct device *dev = &hdev->dev;
 523
 524         dev->type = &bt_host;
 525         dev->class = bt_class;
 526
 527         __module_get(THIS_MODULE);
 528         dev_set_drvdata(dev, hdev);
 529         device_initialize(dev);
 530 }
 531
 532 int hci_add_sysfs(struct hci_dev *hdev)
 533 {
 534         struct device *dev = &hdev->dev;
 535         int err;
 536
 537         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 538
 539         dev->parent = hdev->parent;
 540         dev_set_name(dev, "%s", hdev->name);
 541
 542         err = device_add(dev);
 543         if (err < 0)
 544                 return err;
 545
 546         if (!bt_debugfs)
 547                 return 0;
 548
 549         hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
 550         if (!hdev->debugfs)
 551                 return 0;
 552
 553         debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
 554                                                 hdev, &inquiry_cache_fops);
 555
 556         debugfs_create_file("blacklist", 0444, hdev->debugfs,
 557                                                 hdev, &blacklist_fops);
 558
 559         debugfs_create_file("uuids", 0444, hdev->debugfs, hdev, &uuids_fops);
 560
 561         debugfs_create_file("auto_accept_delay", 0444, hdev->debugfs, hdev,
 562                                                 &auto_accept_delay_fops);
 563         return 0;
 564 }
 565
 566 void hci_del_sysfs(struct hci_dev *hdev)
 567 {
 568         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 569
 570         debugfs_remove_recursive(hdev->debugfs);
 571
 572         device_del(&hdev->dev);
 573 }
 574
 575 int __init bt_sysfs_init(void)
 576 {
 577         bt_debugfs = debugfs_create_dir("bluetooth", NULL);
 578
 579         bt_class = class_create(THIS_MODULE, "bluetooth");
 580         if (IS_ERR(bt_class))
 581                 return PTR_ERR(bt_class);
 582
 583         return 0;
 584 }
 585
 586 void bt_sysfs_cleanup(void)
 587 {
 588         class_destroy(bt_class);
 589
 590         debugfs_remove_recursive(bt_debugfs);
 591 }