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