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
   7 #include <net/bluetooth/bluetooth.h>
   8 #include <net/bluetooth/hci_core.h>
   9
  10 struct class *bt_class = NULL;
  11 EXPORT_SYMBOL_GPL(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 ssize_t show_bus(struct device *dev, struct device_attribute *attr, char *buf)
 196 {
 197         struct hci_dev *hdev = dev_get_drvdata(dev);
 198         return sprintf(buf, "%s\n", host_bustostr(hdev->bus));
 199 }
 200
 201 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
 202 {
 203         struct hci_dev *hdev = dev_get_drvdata(dev);
 204         char name[249];
 205         int i;
 206
 207         for (i = 0; i < 248; i++)
 208                 name[i] = hdev->dev_name[i];
 209
 210         name[248] = '\0';
 211         return sprintf(buf, "%s\n", name);
 212 }
 213
 214 static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
 215 {
 216         struct hci_dev *hdev = dev_get_drvdata(dev);
 217         return sprintf(buf, "0x%.2x%.2x%.2x\n",
 218                         hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
 219 }
 220
 221 static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
 222 {
 223         struct hci_dev *hdev = dev_get_drvdata(dev);
 224         bdaddr_t bdaddr;
 225         baswap(&bdaddr, &hdev->bdaddr);
 226         return sprintf(buf, "%s\n", batostr(&bdaddr));
 227 }
 228
 229 static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
 230 {
 231         struct hci_dev *hdev = dev_get_drvdata(dev);
 232
 233         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 234                                 hdev->features[0], hdev->features[1],
 235                                 hdev->features[2], hdev->features[3],
 236                                 hdev->features[4], hdev->features[5],
 237                                 hdev->features[6], hdev->features[7]);
 238 }
 239
 240 static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
 241 {
 242         struct hci_dev *hdev = dev_get_drvdata(dev);
 243         return sprintf(buf, "%d\n", hdev->manufacturer);
 244 }
 245
 246 static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
 247 {
 248         struct hci_dev *hdev = dev_get_drvdata(dev);
 249         return sprintf(buf, "%d\n", hdev->hci_ver);
 250 }
 251
 252 static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
 253 {
 254         struct hci_dev *hdev = dev_get_drvdata(dev);
 255         return sprintf(buf, "%d\n", hdev->hci_rev);
 256 }
 257
 258 static ssize_t show_idle_timeout(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->idle_timeout);
 262 }
 263
 264 static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 265 {
 266         struct hci_dev *hdev = dev_get_drvdata(dev);
 267         char *ptr;
 268         __u32 val;
 269
 270         val = simple_strtoul(buf, &ptr, 10);
 271         if (ptr == buf)
 272                 return -EINVAL;
 273
 274         if (val != 0 && (val < 500 || val > 3600000))
 275                 return -EINVAL;
 276
 277         hdev->idle_timeout = val;
 278
 279         return count;
 280 }
 281
 282 static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
 283 {
 284         struct hci_dev *hdev = dev_get_drvdata(dev);
 285         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 286 }
 287
 288 static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 289 {
 290         struct hci_dev *hdev = dev_get_drvdata(dev);
 291         char *ptr;
 292         __u16 val;
 293
 294         val = simple_strtoul(buf, &ptr, 10);
 295         if (ptr == buf)
 296                 return -EINVAL;
 297
 298         if (val < 0x0002 || val > 0xFFFE || val % 2)
 299                 return -EINVAL;
 300
 301         if (val < hdev->sniff_min_interval)
 302                 return -EINVAL;
 303
 304         hdev->sniff_max_interval = val;
 305
 306         return count;
 307 }
 308
 309 static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
 310 {
 311         struct hci_dev *hdev = dev_get_drvdata(dev);
 312         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 313 }
 314
 315 static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 316 {
 317         struct hci_dev *hdev = dev_get_drvdata(dev);
 318         char *ptr;
 319         __u16 val;
 320
 321         val = simple_strtoul(buf, &ptr, 10);
 322         if (ptr == buf)
 323                 return -EINVAL;
 324
 325         if (val < 0x0002 || val > 0xFFFE || val % 2)
 326                 return -EINVAL;
 327
 328         if (val > hdev->sniff_max_interval)
 329                 return -EINVAL;
 330
 331         hdev->sniff_min_interval = val;
 332
 333         return count;
 334 }
 335
 336 static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL);
 337 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 338 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 339 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 340 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 341 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 342 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 343 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 344
 345 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 346                                 show_idle_timeout, store_idle_timeout);
 347 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 348                                 show_sniff_max_interval, store_sniff_max_interval);
 349 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 350                                 show_sniff_min_interval, store_sniff_min_interval);
 351
 352 static struct attribute *bt_host_attrs[] = {
 353         &dev_attr_bus.attr,
 354         &dev_attr_name.attr,
 355         &dev_attr_class.attr,
 356         &dev_attr_address.attr,
 357         &dev_attr_features.attr,
 358         &dev_attr_manufacturer.attr,
 359         &dev_attr_hci_version.attr,
 360         &dev_attr_hci_revision.attr,
 361         &dev_attr_idle_timeout.attr,
 362         &dev_attr_sniff_max_interval.attr,
 363         &dev_attr_sniff_min_interval.attr,
 364         NULL
 365 };
 366
 367 static struct attribute_group bt_host_group = {
 368         .attrs = bt_host_attrs,
 369 };
 370
 371 static const struct attribute_group *bt_host_groups[] = {
 372         &bt_host_group,
 373         NULL
 374 };
 375
 376 static void bt_host_release(struct device *dev)
 377 {
 378         void *data = dev_get_drvdata(dev);
 379         kfree(data);
 380 }
 381
 382 static struct device_type bt_host = {
 383         .name    = "host",
 384         .groups  = bt_host_groups,
 385         .release = bt_host_release,
 386 };
 387
 388 static int inquiry_cache_open(struct inode *inode, struct file *file)
 389 {
 390         file->private_data = inode->i_private;
 391         return 0;
 392 }
 393
 394 static ssize_t inquiry_cache_read(struct file *file, char __user *userbuf,
 395                                                 size_t count, loff_t *ppos)
 396 {
 397         struct hci_dev *hdev = file->private_data;
 398         struct inquiry_cache *cache = &hdev->inq_cache;
 399         struct inquiry_entry *e;
 400         char buf[4096];
 401         int n = 0;
 402
 403         hci_dev_lock_bh(hdev);
 404
 405         for (e = cache->list; e; e = e->next) {
 406                 struct inquiry_data *data = &e->data;
 407                 bdaddr_t bdaddr;
 408                 baswap(&bdaddr, &data->bdaddr);
 409                 n += sprintf(buf + n, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
 410                                 batostr(&bdaddr),
 411                                 data->pscan_rep_mode, data->pscan_period_mode,
 412                                 data->pscan_mode, data->dev_class[2],
 413                                 data->dev_class[1], data->dev_class[0],
 414                                 __le16_to_cpu(data->clock_offset),
 415                                 data->rssi, data->ssp_mode, e->timestamp);
 416         }
 417
 418         hci_dev_unlock_bh(hdev);
 419
 420         return simple_read_from_buffer(userbuf, count, ppos, buf, n);
 421 }
 422
 423 static const struct file_operations inquiry_cache_fops = {
 424         .open = inquiry_cache_open,
 425         .read = inquiry_cache_read,
 426 };
 427
 428 int hci_register_sysfs(struct hci_dev *hdev)
 429 {
 430         struct device *dev = &hdev->dev;
 431         int err;
 432
 433         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 434
 435         dev->type = &bt_host;
 436         dev->class = bt_class;
 437         dev->parent = hdev->parent;
 438
 439         dev_set_name(dev, "%s", hdev->name);
 440
 441         dev_set_drvdata(dev, hdev);
 442
 443         err = device_register(dev);
 444         if (err < 0)
 445                 return err;
 446
 447         if (!bt_debugfs)
 448                 return 0;
 449
 450         hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
 451         if (!hdev->debugfs)
 452                 return 0;
 453
 454         debugfs_create_file("inquiry_cache", 0444, hdev->debugfs,
 455                                                 hdev, &inquiry_cache_fops);
 456
 457         return 0;
 458 }
 459
 460 void hci_unregister_sysfs(struct hci_dev *hdev)
 461 {
 462         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 463
 464         debugfs_remove_recursive(hdev->debugfs);
 465
 466         device_del(&hdev->dev);
 467 }
 468
 469 int __init bt_sysfs_init(void)
 470 {
 471         bt_workq = create_singlethread_workqueue("bluetooth");
 472         if (!bt_workq)
 473                 return -ENOMEM;
 474
 475         bt_debugfs = debugfs_create_dir("bluetooth", NULL);
 476
 477         bt_class = class_create(THIS_MODULE, "bluetooth");
 478         if (IS_ERR(bt_class)) {
 479                 destroy_workqueue(bt_workq);
 480                 return PTR_ERR(bt_class);
 481         }
 482
 483         return 0;
 484 }
 485
 486 void bt_sysfs_cleanup(void)
 487 {
 488         class_destroy(bt_class);
 489
 490         debugfs_remove_recursive(bt_debugfs);
 491
 492         destroy_workqueue(bt_workq);
 493 }