net/bluetooth/hci_sysfs.c

   1 /* Bluetooth HCI driver model support. */
   2
   3 #include <linux/kernel.h>
   4 #include <linux/init.h>
   5 #include <linux/debugfs.h>
   6 #include <linux/seq_file.h>
   7
   8 #include <net/bluetooth/bluetooth.h>
   9 #include <net/bluetooth/hci_core.h>
  10
  11 static struct class *bt_class;
  12
  13 struct dentry *bt_debugfs = NULL;
  14 EXPORT_SYMBOL_GPL(bt_debugfs);
  15
  16 static struct workqueue_struct *bt_workq;
  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         default:
  28                 return "UNKNOWN";
  29         }
  30 }
  31
  32 static ssize_t show_link_type(struct device *dev, struct device_attribute *attr, char *buf)
  33 {
  34         struct hci_conn *conn = dev_get_drvdata(dev);
  35         return sprintf(buf, "%s\n", link_typetostr(conn->type));
  36 }
  37
  38 static ssize_t show_link_address(struct device *dev, struct device_attribute *attr, char *buf)
  39 {
  40         struct hci_conn *conn = dev_get_drvdata(dev);
  41         bdaddr_t bdaddr;
  42         baswap(&bdaddr, &conn->dst);
  43         return sprintf(buf, "%s\n", batostr(&bdaddr));
  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(bt_workq, &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(bt_workq, &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_80211:
 201                 return "802.11";
 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[249];
 223         int i;
 224
 225         for (i = 0; i < 248; i++)
 226                 name[i] = hdev->dev_name[i];
 227
 228         name[248] = '\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         bdaddr_t bdaddr;
 243         baswap(&bdaddr, &hdev->bdaddr);
 244         return sprintf(buf, "%s\n", batostr(&bdaddr));
 245 }
 246
 247 static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
 248 {
 249         struct hci_dev *hdev = dev_get_drvdata(dev);
 250
 251         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 252                                 hdev->features[0], hdev->features[1],
 253                                 hdev->features[2], hdev->features[3],
 254                                 hdev->features[4], hdev->features[5],
 255                                 hdev->features[6], hdev->features[7]);
 256 }
 257
 258 static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
 259 {
 260         struct hci_dev *hdev = dev_get_drvdata(dev);
 261         return sprintf(buf, "%d\n", hdev->manufacturer);
 262 }
 263
 264 static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
 265 {
 266         struct hci_dev *hdev = dev_get_drvdata(dev);
 267         return sprintf(buf, "%d\n", hdev->hci_ver);
 268 }
 269
 270 static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
 271 {
 272         struct hci_dev *hdev = dev_get_drvdata(dev);
 273         return sprintf(buf, "%d\n", hdev->hci_rev);
 274 }
 275
 276 static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 277 {
 278         struct hci_dev *hdev = dev_get_drvdata(dev);
 279         return sprintf(buf, "%d\n", hdev->idle_timeout);
 280 }
 281
 282 static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 283 {
 284         struct hci_dev *hdev = dev_get_drvdata(dev);
 285         char *ptr;
 286         __u32 val;
 287
 288         val = simple_strtoul(buf, &ptr, 10);
 289         if (ptr == buf)
 290                 return -EINVAL;
 291
 292         if (val != 0 && (val < 500 || val > 3600000))
 293                 return -EINVAL;
 294
 295         hdev->idle_timeout = val;
 296
 297         return count;
 298 }
 299
 300 static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
 301 {
 302         struct hci_dev *hdev = dev_get_drvdata(dev);
 303         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 304 }
 305
 306 static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 307 {
 308         struct hci_dev *hdev = dev_get_drvdata(dev);
 309         char *ptr;
 310         __u16 val;
 311
 312         val = simple_strtoul(buf, &ptr, 10);
 313         if (ptr == buf)
 314                 return -EINVAL;
 315
 316         if (val < 0x0002 || val > 0xFFFE || val % 2)
 317                 return -EINVAL;
 318
 319         if (val < hdev->sniff_min_interval)
 320                 return -EINVAL;
 321
 322         hdev->sniff_max_interval = val;
 323
 324         return count;
 325 }
 326
 327 static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
 328 {
 329         struct hci_dev *hdev = dev_get_drvdata(dev);
 330         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 331 }
 332
 333 static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 334 {
 335         struct hci_dev *hdev = dev_get_drvdata(dev);
 336         char *ptr;
 337         __u16 val;
 338
 339         val = simple_strtoul(buf, &ptr, 10);
 340         if (ptr == buf)
 341                 return -EINVAL;
 342
 343         if (val < 0x0002 || val > 0xFFFE || val % 2)
 344                 return -EINVAL;
 345
 346         if (val > hdev->sniff_max_interval)
 347                 return -EINVAL;
 348
 349         hdev->sniff_min_interval = val;
 350
 351         return count;
 352 }
 353
 354 static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL);
 355 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 356 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 357 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 358 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 359 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 360 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 361 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 362 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 363
 364 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 365                                 show_idle_timeout, store_idle_timeout);
 366 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 367                                 show_sniff_max_interval, store_sniff_max_interval);
 368 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 369                                 show_sniff_min_interval, store_sniff_min_interval);
 370
 371 static struct attribute *bt_host_attrs[] = {
 372         &dev_attr_bus.attr,
 373         &dev_attr_type.attr,
 374         &dev_attr_name.attr,
 375         &dev_attr_class.attr,
 376         &dev_attr_address.attr,
 377         &dev_attr_features.attr,
 378         &dev_attr_manufacturer.attr,
 379         &dev_attr_hci_version.attr,
 380         &dev_attr_hci_revision.attr,
 381         &dev_attr_idle_timeout.attr,
 382         &dev_attr_sniff_max_interval.attr,
 383         &dev_attr_sniff_min_interval.attr,
 384         NULL
 385 };
 386
 387 static struct attribute_group bt_host_group = {
 388         .attrs = bt_host_attrs,
 389 };
 390
 391 static const struct attribute_group *bt_host_groups[] = {
 392         &bt_host_group,
 393         NULL
 394 };
 395
 396 static void bt_host_release(struct device *dev)
 397 {
 398         void *data = dev_get_drvdata(dev);
 399         kfree(data);
 400 }
 401
 402 static struct device_type bt_host = {
 403         .name    = "host",
 404         .groups  = bt_host_groups,
 405         .release = bt_host_release,
 406 };
 407
 408 static int inquiry_cache_show(struct seq_file *f, void *p)
 409 {
 410         struct hci_dev *hdev = f->private;
 411         struct inquiry_cache *cache = &hdev->inq_cache;
 412         struct inquiry_entry *e;
 413
 414         hci_dev_lock_bh(hdev);
 415
 416         for (e = cache->list; e; e = e->next) {
 417                 struct inquiry_data *data = &e->data;
 418                 bdaddr_t bdaddr;
 419                 baswap(&bdaddr, &data->bdaddr);
 420                 seq_printf(f, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
 421                            batostr(&bdaddr),
 422                            data->pscan_rep_mode, data->pscan_period_mode,
 423                            data->pscan_mode, data->dev_class[2],
 424                            data->dev_class[1], data->dev_class[0],
 425                            __le16_to_cpu(data->clock_offset),
 426                            data->rssi, data->ssp_mode, e->timestamp);
 427         }
 428
 429         hci_dev_unlock_bh(hdev);
 430
 431         return 0;
 432 }
 433
 434 static int inquiry_cache_open(struct inode *inode, struct file *file)
 435 {
 436         return single_open(file, inquiry_cache_show, inode->i_private);
 437 }
 438
 439 static const struct file_operations inquiry_cache_fops = {
 440         .open           = inquiry_cache_open,
 441         .read           = seq_read,
 442         .llseek         = seq_lseek,
 443         .release        = single_release,
 444 };
 445
 446 int hci_register_sysfs(struct hci_dev *hdev)
 447 {
 448         struct device *dev = &hdev->dev;
 449         int err;
 450
 451         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 452
 453         dev->type = &bt_host;
 454         dev->class = bt_class;
 455         dev->parent = hdev->parent;
 456
 457         dev_set_name(dev, "%s", hdev->name);
 458
 459         dev_set_drvdata(dev, hdev);
 460
 461         err = device_register(dev);
 462         if (err < 0)
 463                 return err;
 464
 465         if (!bt_debugfs)
 466                 return 0;
 467
 468         hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
 469         if (!hdev->debugfs)
 470                 return 0;
 471
 472         debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
 473                                                 hdev, &inquiry_cache_fops);
 474
 475         return 0;
 476 }
 477
 478 void hci_unregister_sysfs(struct hci_dev *hdev)
 479 {
 480         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 481
 482         debugfs_remove_recursive(hdev->debugfs);
 483
 484         device_del(&hdev->dev);
 485 }
 486
 487 int __init bt_sysfs_init(void)
 488 {
 489         bt_workq = create_singlethread_workqueue("bluetooth");
 490         if (!bt_workq)
 491                 return -ENOMEM;
 492
 493         bt_debugfs = debugfs_create_dir("bluetooth", NULL);
 494
 495         bt_class = class_create(THIS_MODULE, "bluetooth");
 496         if (IS_ERR(bt_class)) {
 497                 destroy_workqueue(bt_workq);
 498                 return PTR_ERR(bt_class);
 499         }
 500
 501         return 0;
 502 }
 503
 504 void bt_sysfs_cleanup(void)
 505 {
 506         class_destroy(bt_class);
 507
 508         debugfs_remove_recursive(bt_debugfs);
 509
 510         destroy_workqueue(bt_workq);
 511 }