net/bluetooth/hci_sysfs.c

   1 /* Bluetooth HCI driver model support. */
   2
   3 #include <linux/kernel.h>
   4 #include <linux/init.h>
   5
   6 #include <net/bluetooth/bluetooth.h>
   7 #include <net/bluetooth/hci_core.h>
   8
   9 struct class *bt_class = NULL;
  10 EXPORT_SYMBOL_GPL(bt_class);
  11
  12 static struct workqueue_struct *btaddconn;
  13 static struct workqueue_struct *btdelconn;
  14
  15 static inline char *link_typetostr(int type)
  16 {
  17         switch (type) {
  18         case ACL_LINK:
  19                 return "ACL";
  20         case SCO_LINK:
  21                 return "SCO";
  22         case ESCO_LINK:
  23                 return "eSCO";
  24         default:
  25                 return "UNKNOWN";
  26         }
  27 }
  28
  29 static ssize_t show_link_type(struct device *dev, struct device_attribute *attr, char *buf)
  30 {
  31         struct hci_conn *conn = dev_get_drvdata(dev);
  32         return sprintf(buf, "%s\n", link_typetostr(conn->type));
  33 }
  34
  35 static ssize_t show_link_address(struct device *dev, struct device_attribute *attr, char *buf)
  36 {
  37         struct hci_conn *conn = dev_get_drvdata(dev);
  38         bdaddr_t bdaddr;
  39         baswap(&bdaddr, &conn->dst);
  40         return sprintf(buf, "%s\n", batostr(&bdaddr));
  41 }
  42
  43 static ssize_t show_link_features(struct device *dev, struct device_attribute *attr, char *buf)
  44 {
  45         struct hci_conn *conn = dev_get_drvdata(dev);
  46
  47         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
  48                                 conn->features[0], conn->features[1],
  49                                 conn->features[2], conn->features[3],
  50                                 conn->features[4], conn->features[5],
  51                                 conn->features[6], conn->features[7]);
  52 }
  53
  54 #define LINK_ATTR(_name,_mode,_show,_store) \
  55 struct device_attribute link_attr_##_name = __ATTR(_name,_mode,_show,_store)
  56
  57 static LINK_ATTR(type, S_IRUGO, show_link_type, NULL);
  58 static LINK_ATTR(address, S_IRUGO, show_link_address, NULL);
  59 static LINK_ATTR(features, S_IRUGO, show_link_features, NULL);
  60
  61 static struct attribute *bt_link_attrs[] = {
  62         &link_attr_type.attr,
  63         &link_attr_address.attr,
  64         &link_attr_features.attr,
  65         NULL
  66 };
  67
  68 static struct attribute_group bt_link_group = {
  69         .attrs = bt_link_attrs,
  70 };
  71
  72 static struct attribute_group *bt_link_groups[] = {
  73         &bt_link_group,
  74         NULL
  75 };
  76
  77 static void bt_link_release(struct device *dev)
  78 {
  79         void *data = dev_get_drvdata(dev);
  80         kfree(data);
  81 }
  82
  83 static struct device_type bt_link = {
  84         .name    = "link",
  85         .groups  = bt_link_groups,
  86         .release = bt_link_release,
  87 };
  88
  89 static void add_conn(struct work_struct *work)
  90 {
  91         struct hci_conn *conn = container_of(work, struct hci_conn, work);
  92
  93         flush_workqueue(btdelconn);
  94
  95         if (device_add(&conn->dev) < 0) {
  96                 BT_ERR("Failed to register connection device");
  97                 return;
  98         }
  99 }
 100
 101 void hci_conn_add_sysfs(struct hci_conn *conn)
 102 {
 103         struct hci_dev *hdev = conn->hdev;
 104
 105         BT_DBG("conn %p", conn);
 106
 107         conn->dev.type = &bt_link;
 108         conn->dev.class = bt_class;
 109         conn->dev.parent = &hdev->dev;
 110
 111         dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
 112
 113         dev_set_drvdata(&conn->dev, conn);
 114
 115         device_initialize(&conn->dev);
 116
 117         INIT_WORK(&conn->work, add_conn);
 118
 119         queue_work(btaddconn, &conn->work);
 120 }
 121
 122 /*
 123  * The rfcomm tty device will possibly retain even when conn
 124  * is down, and sysfs doesn't support move zombie device,
 125  * so we should move the device before conn device is destroyed.
 126  */
 127 static int __match_tty(struct device *dev, void *data)
 128 {
 129         return !strncmp(dev_name(dev), "rfcomm", 6);
 130 }
 131
 132 static void del_conn(struct work_struct *work)
 133 {
 134         struct hci_conn *conn = container_of(work, struct hci_conn, work);
 135         struct hci_dev *hdev = conn->hdev;
 136
 137         while (1) {
 138                 struct device *dev;
 139
 140                 dev = device_find_child(&conn->dev, NULL, __match_tty);
 141                 if (!dev)
 142                         break;
 143                 device_move(dev, NULL);
 144                 put_device(dev);
 145         }
 146
 147         device_del(&conn->dev);
 148         put_device(&conn->dev);
 149         hci_dev_put(hdev);
 150 }
 151
 152 void hci_conn_del_sysfs(struct hci_conn *conn)
 153 {
 154         BT_DBG("conn %p", conn);
 155
 156         if (!device_is_registered(&conn->dev))
 157                 return;
 158
 159         INIT_WORK(&conn->work, del_conn);
 160
 161         queue_work(btdelconn, &conn->work);
 162 }
 163
 164 static inline char *host_typetostr(int type)
 165 {
 166         switch (type) {
 167         case HCI_VIRTUAL:
 168                 return "VIRTUAL";
 169         case HCI_USB:
 170                 return "USB";
 171         case HCI_PCCARD:
 172                 return "PCCARD";
 173         case HCI_UART:
 174                 return "UART";
 175         case HCI_RS232:
 176                 return "RS232";
 177         case HCI_PCI:
 178                 return "PCI";
 179         case HCI_SDIO:
 180                 return "SDIO";
 181         default:
 182                 return "UNKNOWN";
 183         }
 184 }
 185
 186 static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
 187 {
 188         struct hci_dev *hdev = dev_get_drvdata(dev);
 189         return sprintf(buf, "%s\n", host_typetostr(hdev->type));
 190 }
 191
 192 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
 193 {
 194         struct hci_dev *hdev = dev_get_drvdata(dev);
 195         char name[249];
 196         int i;
 197
 198         for (i = 0; i < 248; i++)
 199                 name[i] = hdev->dev_name[i];
 200
 201         name[248] = '\0';
 202         return sprintf(buf, "%s\n", name);
 203 }
 204
 205 static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
 206 {
 207         struct hci_dev *hdev = dev_get_drvdata(dev);
 208         return sprintf(buf, "0x%.2x%.2x%.2x\n",
 209                         hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
 210 }
 211
 212 static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
 213 {
 214         struct hci_dev *hdev = dev_get_drvdata(dev);
 215         bdaddr_t bdaddr;
 216         baswap(&bdaddr, &hdev->bdaddr);
 217         return sprintf(buf, "%s\n", batostr(&bdaddr));
 218 }
 219
 220 static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
 221 {
 222         struct hci_dev *hdev = dev_get_drvdata(dev);
 223
 224         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 225                                 hdev->features[0], hdev->features[1],
 226                                 hdev->features[2], hdev->features[3],
 227                                 hdev->features[4], hdev->features[5],
 228                                 hdev->features[6], hdev->features[7]);
 229 }
 230
 231 static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
 232 {
 233         struct hci_dev *hdev = dev_get_drvdata(dev);
 234         return sprintf(buf, "%d\n", hdev->manufacturer);
 235 }
 236
 237 static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
 238 {
 239         struct hci_dev *hdev = dev_get_drvdata(dev);
 240         return sprintf(buf, "%d\n", hdev->hci_ver);
 241 }
 242
 243 static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
 244 {
 245         struct hci_dev *hdev = dev_get_drvdata(dev);
 246         return sprintf(buf, "%d\n", hdev->hci_rev);
 247 }
 248
 249 static ssize_t show_inquiry_cache(struct device *dev, struct device_attribute *attr, char *buf)
 250 {
 251         struct hci_dev *hdev = dev_get_drvdata(dev);
 252         struct inquiry_cache *cache = &hdev->inq_cache;
 253         struct inquiry_entry *e;
 254         int n = 0;
 255
 256         hci_dev_lock_bh(hdev);
 257
 258         for (e = cache->list; e; e = e->next) {
 259                 struct inquiry_data *data = &e->data;
 260                 bdaddr_t bdaddr;
 261                 baswap(&bdaddr, &data->bdaddr);
 262                 n += sprintf(buf + n, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
 263                                 batostr(&bdaddr),
 264                                 data->pscan_rep_mode, data->pscan_period_mode,
 265                                 data->pscan_mode, data->dev_class[2],
 266                                 data->dev_class[1], data->dev_class[0],
 267                                 __le16_to_cpu(data->clock_offset),
 268                                 data->rssi, data->ssp_mode, e->timestamp);
 269         }
 270
 271         hci_dev_unlock_bh(hdev);
 272         return n;
 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(type, S_IRUGO, show_type, NULL);
 354 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 355 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 356 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 357 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 358 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 359 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 360 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 361 static DEVICE_ATTR(inquiry_cache, S_IRUGO, show_inquiry_cache, 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_type.attr,
 372         &dev_attr_name.attr,
 373         &dev_attr_class.attr,
 374         &dev_attr_address.attr,
 375         &dev_attr_features.attr,
 376         &dev_attr_manufacturer.attr,
 377         &dev_attr_hci_version.attr,
 378         &dev_attr_hci_revision.attr,
 379         &dev_attr_inquiry_cache.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 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 int hci_register_sysfs(struct hci_dev *hdev)
 408 {
 409         struct device *dev = &hdev->dev;
 410         int err;
 411
 412         BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);
 413
 414         dev->type = &bt_host;
 415         dev->class = bt_class;
 416         dev->parent = hdev->parent;
 417
 418         dev_set_name(dev, "%s", hdev->name);
 419
 420         dev_set_drvdata(dev, hdev);
 421
 422         err = device_register(dev);
 423         if (err < 0)
 424                 return err;
 425
 426         return 0;
 427 }
 428
 429 void hci_unregister_sysfs(struct hci_dev *hdev)
 430 {
 431         BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);
 432
 433         device_del(&hdev->dev);
 434 }
 435
 436 int __init bt_sysfs_init(void)
 437 {
 438         btaddconn = create_singlethread_workqueue("btaddconn");
 439         if (!btaddconn)
 440                 return -ENOMEM;
 441
 442         btdelconn = create_singlethread_workqueue("btdelconn");
 443         if (!btdelconn) {
 444                 destroy_workqueue(btaddconn);
 445                 return -ENOMEM;
 446         }
 447
 448         bt_class = class_create(THIS_MODULE, "bluetooth");
 449         if (IS_ERR(bt_class)) {
 450                 destroy_workqueue(btdelconn);
 451                 destroy_workqueue(btaddconn);
 452                 return PTR_ERR(bt_class);
 453         }
 454
 455         return 0;
 456 }
 457
 458 void bt_sysfs_cleanup(void)
 459 {
 460         destroy_workqueue(btaddconn);
 461         destroy_workqueue(btdelconn);
 462
 463         class_destroy(bt_class);
 464 }