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