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 struct workqueue_struct *bt_workq;
  18
  19 static inline char *link_typetostr(int type)
  20 {
  21         switch (type) {
  22         case ACL_LINK:
  23                 return "ACL";
  24         case SCO_LINK:
  25                 return "SCO";
  26         case ESCO_LINK:
  27                 return "eSCO";
  28         default:
  29                 return "UNKNOWN";
  30         }
  31 }
  32
  33 static ssize_t show_link_type(struct device *dev, struct device_attribute *attr, char *buf)
  34 {
  35         struct hci_conn *conn = dev_get_drvdata(dev);
  36         return sprintf(buf, "%s\n", link_typetostr(conn->type));
  37 }
  38
  39 static ssize_t show_link_address(struct device *dev, struct device_attribute *attr, char *buf)
  40 {
  41         struct hci_conn *conn = dev_get_drvdata(dev);
  42         bdaddr_t bdaddr;
  43         baswap(&bdaddr, &conn->dst);
  44         return sprintf(buf, "%s\n", batostr(&bdaddr));
  45 }
  46
  47 static ssize_t show_link_features(struct device *dev, struct device_attribute *attr, char *buf)
  48 {
  49         struct hci_conn *conn = dev_get_drvdata(dev);
  50
  51         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
  52                                 conn->features[0], conn->features[1],
  53                                 conn->features[2], conn->features[3],
  54                                 conn->features[4], conn->features[5],
  55                                 conn->features[6], conn->features[7]);
  56 }
  57
  58 #define LINK_ATTR(_name,_mode,_show,_store) \
  59 struct device_attribute link_attr_##_name = __ATTR(_name,_mode,_show,_store)
  60
  61 static LINK_ATTR(type, S_IRUGO, show_link_type, NULL);
  62 static LINK_ATTR(address, S_IRUGO, show_link_address, NULL);
  63 static LINK_ATTR(features, S_IRUGO, show_link_features, NULL);
  64
  65 static struct attribute *bt_link_attrs[] = {
  66         &link_attr_type.attr,
  67         &link_attr_address.attr,
  68         &link_attr_features.attr,
  69         NULL
  70 };
  71
  72 static struct attribute_group bt_link_group = {
  73         .attrs = bt_link_attrs,
  74 };
  75
  76 static const struct attribute_group *bt_link_groups[] = {
  77         &bt_link_group,
  78         NULL
  79 };
  80
  81 static void bt_link_release(struct device *dev)
  82 {
  83         void *data = dev_get_drvdata(dev);
  84         kfree(data);
  85 }
  86
  87 static struct device_type bt_link = {
  88         .name    = "link",
  89         .groups  = bt_link_groups,
  90         .release = bt_link_release,
  91 };
  92
  93 static void add_conn(struct work_struct *work)
  94 {
  95         struct hci_conn *conn = container_of(work, struct hci_conn, work_add);
  96         struct hci_dev *hdev = conn->hdev;
  97
  98         dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
  99
 100         dev_set_drvdata(&conn->dev, conn);
 101
 102         if (device_add(&conn->dev) < 0) {
 103                 BT_ERR("Failed to register connection device");
 104                 return;
 105         }
 106
 107         hci_dev_hold(hdev);
 108 }
 109
 110 /*
 111  * The rfcomm tty device will possibly retain even when conn
 112  * is down, and sysfs doesn't support move zombie device,
 113  * so we should move the device before conn device is destroyed.
 114  */
 115 static int __match_tty(struct device *dev, void *data)
 116 {
 117         return !strncmp(dev_name(dev), "rfcomm", 6);
 118 }
 119
 120 static void del_conn(struct work_struct *work)
 121 {
 122         struct hci_conn *conn = container_of(work, struct hci_conn, work_del);
 123         struct hci_dev *hdev = conn->hdev;
 124
 125         if (!device_is_registered(&conn->dev))
 126                 return;
 127
 128         while (1) {
 129                 struct device *dev;
 130
 131                 dev = device_find_child(&conn->dev, NULL, __match_tty);
 132                 if (!dev)
 133                         break;
 134                 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
 135                 put_device(dev);
 136         }
 137
 138         device_del(&conn->dev);
 139         put_device(&conn->dev);
 140
 141         hci_dev_put(hdev);
 142 }
 143
 144 void hci_conn_init_sysfs(struct hci_conn *conn)
 145 {
 146         struct hci_dev *hdev = conn->hdev;
 147
 148         BT_DBG("conn %p", conn);
 149
 150         conn->dev.type = &bt_link;
 151         conn->dev.class = bt_class;
 152         conn->dev.parent = &hdev->dev;
 153
 154         device_initialize(&conn->dev);
 155
 156         INIT_WORK(&conn->work_add, add_conn);
 157         INIT_WORK(&conn->work_del, del_conn);
 158 }
 159
 160 void hci_conn_add_sysfs(struct hci_conn *conn)
 161 {
 162         BT_DBG("conn %p", conn);
 163
 164         queue_work(bt_workq, &conn->work_add);
 165 }
 166
 167 void hci_conn_del_sysfs(struct hci_conn *conn)
 168 {
 169         BT_DBG("conn %p", conn);
 170
 171         queue_work(bt_workq, &conn->work_del);
 172 }
 173
 174 static inline char *host_bustostr(int bus)
 175 {
 176         switch (bus) {
 177         case HCI_VIRTUAL:
 178                 return "VIRTUAL";
 179         case HCI_USB:
 180                 return "USB";
 181         case HCI_PCCARD:
 182                 return "PCCARD";
 183         case HCI_UART:
 184                 return "UART";
 185         case HCI_RS232:
 186                 return "RS232";
 187         case HCI_PCI:
 188                 return "PCI";
 189         case HCI_SDIO:
 190                 return "SDIO";
 191         default:
 192                 return "UNKNOWN";
 193         }
 194 }
 195
 196 static inline char *host_typetostr(int type)
 197 {
 198         switch (type) {
 199         case HCI_BREDR:
 200                 return "BR/EDR";
 201         case HCI_80211:
 202                 return "802.11";
 203         default:
 204                 return "UNKNOWN";
 205         }
 206 }
 207
 208 static ssize_t show_bus(struct device *dev, struct device_attribute *attr, char *buf)
 209 {
 210         struct hci_dev *hdev = dev_get_drvdata(dev);
 211         return sprintf(buf, "%s\n", host_bustostr(hdev->bus));
 212 }
 213
 214 static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
 215 {
 216         struct hci_dev *hdev = dev_get_drvdata(dev);
 217         return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type));
 218 }
 219
 220 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
 221 {
 222         struct hci_dev *hdev = dev_get_drvdata(dev);
 223         char name[249];
 224         int i;
 225
 226         for (i = 0; i < 248; i++)
 227                 name[i] = hdev->dev_name[i];
 228
 229         name[248] = '\0';
 230         return sprintf(buf, "%s\n", name);
 231 }
 232
 233 static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
 234 {
 235         struct hci_dev *hdev = dev_get_drvdata(dev);
 236         return sprintf(buf, "0x%.2x%.2x%.2x\n",
 237                         hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
 238 }
 239
 240 static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
 241 {
 242         struct hci_dev *hdev = dev_get_drvdata(dev);
 243         bdaddr_t bdaddr;
 244         baswap(&bdaddr, &hdev->bdaddr);
 245         return sprintf(buf, "%s\n", batostr(&bdaddr));
 246 }
 247
 248 static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
 249 {
 250         struct hci_dev *hdev = dev_get_drvdata(dev);
 251
 252         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 253                                 hdev->features[0], hdev->features[1],
 254                                 hdev->features[2], hdev->features[3],
 255                                 hdev->features[4], hdev->features[5],
 256                                 hdev->features[6], hdev->features[7]);
 257 }
 258
 259 static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
 260 {
 261         struct hci_dev *hdev = dev_get_drvdata(dev);
 262         return sprintf(buf, "%d\n", hdev->manufacturer);
 263 }
 264
 265 static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
 266 {
 267         struct hci_dev *hdev = dev_get_drvdata(dev);
 268         return sprintf(buf, "%d\n", hdev->hci_ver);
 269 }
 270
 271 static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
 272 {
 273         struct hci_dev *hdev = dev_get_drvdata(dev);
 274         return sprintf(buf, "%d\n", hdev->hci_rev);
 275 }
 276
 277 static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 278 {
 279         struct hci_dev *hdev = dev_get_drvdata(dev);
 280         return sprintf(buf, "%d\n", hdev->idle_timeout);
 281 }
 282
 283 static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 284 {
 285         struct hci_dev *hdev = dev_get_drvdata(dev);
 286         char *ptr;
 287         __u32 val;
 288
 289         val = simple_strtoul(buf, &ptr, 10);
 290         if (ptr == buf)
 291                 return -EINVAL;
 292
 293         if (val != 0 && (val < 500 || val > 3600000))
 294                 return -EINVAL;
 295
 296         hdev->idle_timeout = val;
 297
 298         return count;
 299 }
 300
 301 static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
 302 {
 303         struct hci_dev *hdev = dev_get_drvdata(dev);
 304         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 305 }
 306
 307 static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 308 {
 309         struct hci_dev *hdev = dev_get_drvdata(dev);
 310         char *ptr;
 311         __u16 val;
 312
 313         val = simple_strtoul(buf, &ptr, 10);
 314         if (ptr == buf)
 315                 return -EINVAL;
 316
 317         if (val < 0x0002 || val > 0xFFFE || val % 2)
 318                 return -EINVAL;
 319
 320         if (val < hdev->sniff_min_interval)
 321                 return -EINVAL;
 322
 323         hdev->sniff_max_interval = val;
 324
 325         return count;
 326 }
 327
 328 static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
 329 {
 330         struct hci_dev *hdev = dev_get_drvdata(dev);
 331         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 332 }
 333
 334 static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 335 {
 336         struct hci_dev *hdev = dev_get_drvdata(dev);
 337         char *ptr;
 338         __u16 val;
 339
 340         val = simple_strtoul(buf, &ptr, 10);
 341         if (ptr == buf)
 342                 return -EINVAL;
 343
 344         if (val < 0x0002 || val > 0xFFFE || val % 2)
 345                 return -EINVAL;
 346
 347         if (val > hdev->sniff_max_interval)
 348                 return -EINVAL;
 349
 350         hdev->sniff_min_interval = val;
 351
 352         return count;
 353 }
 354
 355 static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL);
 356 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 357 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 358 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 359 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 360 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 361 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 362 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 363 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 364
 365 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 366                                 show_idle_timeout, store_idle_timeout);
 367 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 368                                 show_sniff_max_interval, store_sniff_max_interval);
 369 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 370                                 show_sniff_min_interval, store_sniff_min_interval);
 371
 372 static struct attribute *bt_host_attrs[] = {
 373         &dev_attr_bus.attr,
 374         &dev_attr_type.attr,
 375         &dev_attr_name.attr,
 376         &dev_attr_class.attr,
 377         &dev_attr_address.attr,
 378         &dev_attr_features.attr,
 379         &dev_attr_manufacturer.attr,
 380         &dev_attr_hci_version.attr,
 381         &dev_attr_hci_revision.attr,
 382         &dev_attr_idle_timeout.attr,
 383         &dev_attr_sniff_max_interval.attr,
 384         &dev_attr_sniff_min_interval.attr,
 385         NULL
 386 };
 387
 388 static struct attribute_group bt_host_group = {
 389         .attrs = bt_host_attrs,
 390 };
 391
 392 static const struct attribute_group *bt_host_groups[] = {
 393         &bt_host_group,
 394         NULL
 395 };
 396
 397 static void bt_host_release(struct device *dev)
 398 {
 399         void *data = dev_get_drvdata(dev);
 400         kfree(data);
 401 }
 402
 403 static struct device_type bt_host = {
 404         .name    = "host",
 405         .groups  = bt_host_groups,
 406         .release = bt_host_release,
 407 };
 408
 409 static int inquiry_cache_show(struct seq_file *f, void *p)
 410 {
 411         struct hci_dev *hdev = f->private;
 412         struct inquiry_cache *cache = &hdev->inq_cache;
 413         struct inquiry_entry *e;
 414
 415         hci_dev_lock_bh(hdev);
 416
 417         for (e = cache->list; e; e = e->next) {
 418                 struct inquiry_data *data = &e->data;
 419                 bdaddr_t bdaddr;
 420                 baswap(&bdaddr, &data->bdaddr);
 421                 seq_printf(f, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
 422                            batostr(&bdaddr),
 423                            data->pscan_rep_mode, data->pscan_period_mode,
 424                            data->pscan_mode, data->dev_class[2],
 425                            data->dev_class[1], data->dev_class[0],
 426                            __le16_to_cpu(data->clock_offset),
 427                            data->rssi, data->ssp_mode, e->timestamp);
 428         }
 429
 430         hci_dev_unlock_bh(hdev);
 431
 432         return 0;
 433 }
 434
 435 static int inquiry_cache_open(struct inode *inode, struct file *file)
 436 {
 437         return single_open(file, inquiry_cache_show, inode->i_private);
 438 }
 439
 440 static const struct file_operations inquiry_cache_fops = {
 441         .open           = inquiry_cache_open,
 442         .read           = seq_read,
 443         .llseek         = seq_lseek,
 444         .release        = single_release,
 445 };
 446
 447 int hci_register_sysfs(struct hci_dev *hdev)
 448 {
 449         struct device *dev = &hdev->dev;
 450         int err;
 451
 452         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 453
 454         dev->type = &bt_host;
 455         dev->class = bt_class;
 456         dev->parent = hdev->parent;
 457
 458         dev_set_name(dev, "%s", hdev->name);
 459
 460         dev_set_drvdata(dev, hdev);
 461
 462         err = device_register(dev);
 463         if (err < 0)
 464                 return err;
 465
 466         if (!bt_debugfs)
 467                 return 0;
 468
 469         hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
 470         if (!hdev->debugfs)
 471                 return 0;
 472
 473         debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
 474                                                 hdev, &inquiry_cache_fops);
 475
 476         return 0;
 477 }
 478
 479 void hci_unregister_sysfs(struct hci_dev *hdev)
 480 {
 481         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 482
 483         debugfs_remove_recursive(hdev->debugfs);
 484
 485         device_del(&hdev->dev);
 486 }
 487
 488 int __init bt_sysfs_init(void)
 489 {
 490         bt_workq = create_singlethread_workqueue("bluetooth");
 491         if (!bt_workq)
 492                 return -ENOMEM;
 493
 494         bt_debugfs = debugfs_create_dir("bluetooth", NULL);
 495
 496         bt_class = class_create(THIS_MODULE, "bluetooth");
 497         if (IS_ERR(bt_class)) {
 498                 destroy_workqueue(bt_workq);
 499                 return PTR_ERR(bt_class);
 500         }
 501
 502         return 0;
 503 }
 504
 505 void bt_sysfs_cleanup(void)
 506 {
 507         class_destroy(bt_class);
 508
 509         debugfs_remove_recursive(bt_debugfs);
 510
 511         destroy_workqueue(bt_workq);
 512 }