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