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
   9 #include <net/bluetooth/bluetooth.h>
  10 #include <net/bluetooth/hci_core.h>
  11
  12 static struct class *bt_class;
  13
  14 struct dentry *bt_debugfs = NULL;
  15 EXPORT_SYMBOL_GPL(bt_debugfs);
  16
  17 static inline char *link_typetostr(int type)
  18 {
  19         switch (type) {
  20         case ACL_LINK:
  21                 return "ACL";
  22         case SCO_LINK:
  23                 return "SCO";
  24         case ESCO_LINK:
  25                 return "eSCO";
  26         default:
  27                 return "UNKNOWN";
  28         }
  29 }
  30
  31 static ssize_t show_link_type(struct device *dev, struct device_attribute *attr, char *buf)
  32 {
  33         struct hci_conn *conn = dev_get_drvdata(dev);
  34         return sprintf(buf, "%s\n", link_typetostr(conn->type));
  35 }
  36
  37 static ssize_t show_link_address(struct device *dev, struct device_attribute *attr, char *buf)
  38 {
  39         struct hci_conn *conn = dev_get_drvdata(dev);
  40         bdaddr_t bdaddr;
  41         baswap(&bdaddr, &conn->dst);
  42         return sprintf(buf, "%s\n", batostr(&bdaddr));
  43 }
  44
  45 static ssize_t show_link_features(struct device *dev, struct device_attribute *attr, char *buf)
  46 {
  47         struct hci_conn *conn = dev_get_drvdata(dev);
  48
  49         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
  50                                 conn->features[0], conn->features[1],
  51                                 conn->features[2], conn->features[3],
  52                                 conn->features[4], conn->features[5],
  53                                 conn->features[6], conn->features[7]);
  54 }
  55
  56 #define LINK_ATTR(_name,_mode,_show,_store) \
  57 struct device_attribute link_attr_##_name = __ATTR(_name,_mode,_show,_store)
  58
  59 static LINK_ATTR(type, S_IRUGO, show_link_type, NULL);
  60 static LINK_ATTR(address, S_IRUGO, show_link_address, NULL);
  61 static LINK_ATTR(features, S_IRUGO, show_link_features, NULL);
  62
  63 static struct attribute *bt_link_attrs[] = {
  64         &link_attr_type.attr,
  65         &link_attr_address.attr,
  66         &link_attr_features.attr,
  67         NULL
  68 };
  69
  70 static struct attribute_group bt_link_group = {
  71         .attrs = bt_link_attrs,
  72 };
  73
  74 static const struct attribute_group *bt_link_groups[] = {
  75         &bt_link_group,
  76         NULL
  77 };
  78
  79 static void bt_link_release(struct device *dev)
  80 {
  81         void *data = dev_get_drvdata(dev);
  82         kfree(data);
  83 }
  84
  85 static struct device_type bt_link = {
  86         .name    = "link",
  87         .groups  = bt_link_groups,
  88         .release = bt_link_release,
  89 };
  90
  91 static void add_conn(struct work_struct *work)
  92 {
  93         struct hci_conn *conn = container_of(work, struct hci_conn, work_add);
  94         struct hci_dev *hdev = conn->hdev;
  95
  96         dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
  97
  98         dev_set_drvdata(&conn->dev, conn);
  99
 100         if (device_add(&conn->dev) < 0) {
 101                 BT_ERR("Failed to register connection device");
 102                 return;
 103         }
 104
 105         hci_dev_hold(hdev);
 106 }
 107
 108 /*
 109  * The rfcomm tty device will possibly retain even when conn
 110  * is down, and sysfs doesn't support move zombie device,
 111  * so we should move the device before conn device is destroyed.
 112  */
 113 static int __match_tty(struct device *dev, void *data)
 114 {
 115         return !strncmp(dev_name(dev), "rfcomm", 6);
 116 }
 117
 118 static void del_conn(struct work_struct *work)
 119 {
 120         struct hci_conn *conn = container_of(work, struct hci_conn, work_del);
 121         struct hci_dev *hdev = conn->hdev;
 122
 123         if (!device_is_registered(&conn->dev))
 124                 return;
 125
 126         while (1) {
 127                 struct device *dev;
 128
 129                 dev = device_find_child(&conn->dev, NULL, __match_tty);
 130                 if (!dev)
 131                         break;
 132                 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
 133                 put_device(dev);
 134         }
 135
 136         device_del(&conn->dev);
 137         put_device(&conn->dev);
 138
 139         hci_dev_put(hdev);
 140 }
 141
 142 void hci_conn_init_sysfs(struct hci_conn *conn)
 143 {
 144         struct hci_dev *hdev = conn->hdev;
 145
 146         BT_DBG("conn %p", conn);
 147
 148         conn->dev.type = &bt_link;
 149         conn->dev.class = bt_class;
 150         conn->dev.parent = &hdev->dev;
 151
 152         device_initialize(&conn->dev);
 153
 154         INIT_WORK(&conn->work_add, add_conn);
 155         INIT_WORK(&conn->work_del, del_conn);
 156 }
 157
 158 void hci_conn_add_sysfs(struct hci_conn *conn)
 159 {
 160         BT_DBG("conn %p", conn);
 161
 162         queue_work(conn->hdev->workqueue, &conn->work_add);
 163 }
 164
 165 void hci_conn_del_sysfs(struct hci_conn *conn)
 166 {
 167         BT_DBG("conn %p", conn);
 168
 169         queue_work(conn->hdev->workqueue, &conn->work_del);
 170 }
 171
 172 static inline char *host_bustostr(int bus)
 173 {
 174         switch (bus) {
 175         case HCI_VIRTUAL:
 176                 return "VIRTUAL";
 177         case HCI_USB:
 178                 return "USB";
 179         case HCI_PCCARD:
 180                 return "PCCARD";
 181         case HCI_UART:
 182                 return "UART";
 183         case HCI_RS232:
 184                 return "RS232";
 185         case HCI_PCI:
 186                 return "PCI";
 187         case HCI_SDIO:
 188                 return "SDIO";
 189         default:
 190                 return "UNKNOWN";
 191         }
 192 }
 193
 194 static inline char *host_typetostr(int type)
 195 {
 196         switch (type) {
 197         case HCI_BREDR:
 198                 return "BR/EDR";
 199         case HCI_80211:
 200                 return "802.11";
 201         default:
 202                 return "UNKNOWN";
 203         }
 204 }
 205
 206 static ssize_t show_bus(struct device *dev, struct device_attribute *attr, char *buf)
 207 {
 208         struct hci_dev *hdev = dev_get_drvdata(dev);
 209         return sprintf(buf, "%s\n", host_bustostr(hdev->bus));
 210 }
 211
 212 static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
 213 {
 214         struct hci_dev *hdev = dev_get_drvdata(dev);
 215         return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type));
 216 }
 217
 218 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
 219 {
 220         struct hci_dev *hdev = dev_get_drvdata(dev);
 221         char name[249];
 222         int i;
 223
 224         for (i = 0; i < 248; i++)
 225                 name[i] = hdev->dev_name[i];
 226
 227         name[248] = '\0';
 228         return sprintf(buf, "%s\n", name);
 229 }
 230
 231 static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
 232 {
 233         struct hci_dev *hdev = dev_get_drvdata(dev);
 234         return sprintf(buf, "0x%.2x%.2x%.2x\n",
 235                         hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
 236 }
 237
 238 static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
 239 {
 240         struct hci_dev *hdev = dev_get_drvdata(dev);
 241         bdaddr_t bdaddr;
 242         baswap(&bdaddr, &hdev->bdaddr);
 243         return sprintf(buf, "%s\n", batostr(&bdaddr));
 244 }
 245
 246 static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
 247 {
 248         struct hci_dev *hdev = dev_get_drvdata(dev);
 249
 250         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 251                                 hdev->features[0], hdev->features[1],
 252                                 hdev->features[2], hdev->features[3],
 253                                 hdev->features[4], hdev->features[5],
 254                                 hdev->features[6], hdev->features[7]);
 255 }
 256
 257 static ssize_t show_manufacturer(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->manufacturer);
 261 }
 262
 263 static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
 264 {
 265         struct hci_dev *hdev = dev_get_drvdata(dev);
 266         return sprintf(buf, "%d\n", hdev->hci_ver);
 267 }
 268
 269 static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
 270 {
 271         struct hci_dev *hdev = dev_get_drvdata(dev);
 272         return sprintf(buf, "%d\n", hdev->hci_rev);
 273 }
 274
 275 static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 276 {
 277         struct hci_dev *hdev = dev_get_drvdata(dev);
 278         return sprintf(buf, "%d\n", hdev->idle_timeout);
 279 }
 280
 281 static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 282 {
 283         struct hci_dev *hdev = dev_get_drvdata(dev);
 284         char *ptr;
 285         __u32 val;
 286
 287         val = simple_strtoul(buf, &ptr, 10);
 288         if (ptr == buf)
 289                 return -EINVAL;
 290
 291         if (val != 0 && (val < 500 || val > 3600000))
 292                 return -EINVAL;
 293
 294         hdev->idle_timeout = val;
 295
 296         return count;
 297 }
 298
 299 static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
 300 {
 301         struct hci_dev *hdev = dev_get_drvdata(dev);
 302         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 303 }
 304
 305 static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 306 {
 307         struct hci_dev *hdev = dev_get_drvdata(dev);
 308         char *ptr;
 309         __u16 val;
 310
 311         val = simple_strtoul(buf, &ptr, 10);
 312         if (ptr == buf)
 313                 return -EINVAL;
 314
 315         if (val < 0x0002 || val > 0xFFFE || val % 2)
 316                 return -EINVAL;
 317
 318         if (val < hdev->sniff_min_interval)
 319                 return -EINVAL;
 320
 321         hdev->sniff_max_interval = val;
 322
 323         return count;
 324 }
 325
 326 static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
 327 {
 328         struct hci_dev *hdev = dev_get_drvdata(dev);
 329         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 330 }
 331
 332 static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 333 {
 334         struct hci_dev *hdev = dev_get_drvdata(dev);
 335         char *ptr;
 336         __u16 val;
 337
 338         val = simple_strtoul(buf, &ptr, 10);
 339         if (ptr == buf)
 340                 return -EINVAL;
 341
 342         if (val < 0x0002 || val > 0xFFFE || val % 2)
 343                 return -EINVAL;
 344
 345         if (val > hdev->sniff_max_interval)
 346                 return -EINVAL;
 347
 348         hdev->sniff_min_interval = val;
 349
 350         return count;
 351 }
 352
 353 static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL);
 354 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 355 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 356 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 357 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 358 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 359 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 360 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 361 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 362
 363 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 364                                 show_idle_timeout, store_idle_timeout);
 365 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 366                                 show_sniff_max_interval, store_sniff_max_interval);
 367 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 368                                 show_sniff_min_interval, store_sniff_min_interval);
 369
 370 static struct attribute *bt_host_attrs[] = {
 371         &dev_attr_bus.attr,
 372         &dev_attr_type.attr,
 373         &dev_attr_name.attr,
 374         &dev_attr_class.attr,
 375         &dev_attr_address.attr,
 376         &dev_attr_features.attr,
 377         &dev_attr_manufacturer.attr,
 378         &dev_attr_hci_version.attr,
 379         &dev_attr_hci_revision.attr,
 380         &dev_attr_idle_timeout.attr,
 381         &dev_attr_sniff_max_interval.attr,
 382         &dev_attr_sniff_min_interval.attr,
 383         NULL
 384 };
 385
 386 static struct attribute_group bt_host_group = {
 387         .attrs = bt_host_attrs,
 388 };
 389
 390 static const struct attribute_group *bt_host_groups[] = {
 391         &bt_host_group,
 392         NULL
 393 };
 394
 395 static void bt_host_release(struct device *dev)
 396 {
 397         void *data = dev_get_drvdata(dev);
 398         kfree(data);
 399 }
 400
 401 static struct device_type bt_host = {
 402         .name    = "host",
 403         .groups  = bt_host_groups,
 404         .release = bt_host_release,
 405 };
 406
 407 static int inquiry_cache_show(struct seq_file *f, void *p)
 408 {
 409         struct hci_dev *hdev = f->private;
 410         struct inquiry_cache *cache = &hdev->inq_cache;
 411         struct inquiry_entry *e;
 412
 413         hci_dev_lock_bh(hdev);
 414
 415         for (e = cache->list; e; e = e->next) {
 416                 struct inquiry_data *data = &e->data;
 417                 bdaddr_t bdaddr;
 418                 baswap(&bdaddr, &data->bdaddr);
 419                 seq_printf(f, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
 420                            batostr(&bdaddr),
 421                            data->pscan_rep_mode, data->pscan_period_mode,
 422                            data->pscan_mode, data->dev_class[2],
 423                            data->dev_class[1], data->dev_class[0],
 424                            __le16_to_cpu(data->clock_offset),
 425                            data->rssi, data->ssp_mode, e->timestamp);
 426         }
 427
 428         hci_dev_unlock_bh(hdev);
 429
 430         return 0;
 431 }
 432
 433 static int inquiry_cache_open(struct inode *inode, struct file *file)
 434 {
 435         return single_open(file, inquiry_cache_show, inode->i_private);
 436 }
 437
 438 static const struct file_operations inquiry_cache_fops = {
 439         .open           = inquiry_cache_open,
 440         .read           = seq_read,
 441         .llseek         = seq_lseek,
 442         .release        = single_release,
 443 };
 444
 445 int hci_register_sysfs(struct hci_dev *hdev)
 446 {
 447         struct device *dev = &hdev->dev;
 448         int err;
 449
 450         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 451
 452         dev->type = &bt_host;
 453         dev->class = bt_class;
 454         dev->parent = hdev->parent;
 455
 456         dev_set_name(dev, "%s", hdev->name);
 457
 458         dev_set_drvdata(dev, hdev);
 459
 460         err = device_register(dev);
 461         if (err < 0)
 462                 return err;
 463
 464         if (!bt_debugfs)
 465                 return 0;
 466
 467         hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
 468         if (!hdev->debugfs)
 469                 return 0;
 470
 471         debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
 472                                                 hdev, &inquiry_cache_fops);
 473
 474         return 0;
 475 }
 476
 477 void hci_unregister_sysfs(struct hci_dev *hdev)
 478 {
 479         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 480
 481         debugfs_remove_recursive(hdev->debugfs);
 482
 483         device_del(&hdev->dev);
 484 }
 485
 486 int __init bt_sysfs_init(void)
 487 {
 488         bt_debugfs = debugfs_create_dir("bluetooth", NULL);
 489
 490         bt_class = class_create(THIS_MODULE, "bluetooth");
 491         if (IS_ERR(bt_class))
 492                 return PTR_ERR(bt_class);
 493
 494         return 0;
 495 }
 496
 497 void bt_sysfs_cleanup(void)
 498 {
 499         class_destroy(bt_class);
 500
 501         debugfs_remove_recursive(bt_debugfs);
 502 }