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
 104 /*
 105  * The rfcomm tty device will possibly retain even when conn
 106  * is down, and sysfs doesn't support move zombie device,
 107  * so we should move the device before conn device is destroyed.
 108  */
 109 static int __match_tty(struct device *dev, void *data)
 110 {
 111         return !strncmp(dev_name(dev), "rfcomm", 6);
 112 }
 113
 114 static void del_conn(struct work_struct *work)
 115 {
 116         struct hci_conn *conn = container_of(work, struct hci_conn, work_del);
 117         struct hci_dev *hdev = conn->hdev;
 118
 119         /* ensure previous add is complete */
 120         flush_work(&conn->work_add);
 121
 122         if (!device_is_registered(&conn->dev))
 123                 return;
 124
 125         while (1) {
 126                 struct device *dev;
 127
 128                 dev = device_find_child(&conn->dev, NULL, __match_tty);
 129                 if (!dev)
 130                         break;
 131                 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
 132                 put_device(dev);
 133         }
 134
 135         device_del(&conn->dev);
 136         put_device(&conn->dev);
 137         hci_dev_put(hdev);
 138 }
 139
 140 void hci_conn_init_sysfs(struct hci_conn *conn)
 141 {
 142         struct hci_dev *hdev = conn->hdev;
 143
 144         BT_DBG("conn %p", conn);
 145
 146         conn->dev.type = &bt_link;
 147         conn->dev.class = bt_class;
 148         conn->dev.parent = &hdev->dev;
 149
 150         dev_set_drvdata(&conn->dev, conn);
 151
 152         device_initialize(&conn->dev);
 153
 154         INIT_WORK(&conn->work_add, add_conn);
 155         INIT_WORK(&conn->work_del, del_conn);
 156 }
 157
 158 void hci_conn_add_sysfs(struct hci_conn *conn)
 159 {
 160         BT_DBG("conn %p", conn);
 161
 162         queue_work(bt_workq, &conn->work_add);
 163 }
 164
 165 void hci_conn_del_sysfs(struct hci_conn *conn)
 166 {
 167         BT_DBG("conn %p", conn);
 168
 169         queue_work(bt_workq, &conn->work_del);
 170 }
 171
 172 static inline char *host_typetostr(int type)
 173 {
 174         switch (type) {
 175         case HCI_VIRTUAL:
 176                 return "VIRTUAL";
 177         case HCI_USB:
 178                 return "USB";
 179         case HCI_PCCARD:
 180                 return "PCCARD";
 181         case HCI_UART:
 182                 return "UART";
 183         case HCI_RS232:
 184                 return "RS232";
 185         case HCI_PCI:
 186                 return "PCI";
 187         case HCI_SDIO:
 188                 return "SDIO";
 189         default:
 190                 return "UNKNOWN";
 191         }
 192 }
 193
 194 static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
 195 {
 196         struct hci_dev *hdev = dev_get_drvdata(dev);
 197         return sprintf(buf, "%s\n", host_typetostr(hdev->type));
 198 }
 199
 200 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
 201 {
 202         struct hci_dev *hdev = dev_get_drvdata(dev);
 203         char name[249];
 204         int i;
 205
 206         for (i = 0; i < 248; i++)
 207                 name[i] = hdev->dev_name[i];
 208
 209         name[248] = '\0';
 210         return sprintf(buf, "%s\n", name);
 211 }
 212
 213 static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
 214 {
 215         struct hci_dev *hdev = dev_get_drvdata(dev);
 216         return sprintf(buf, "0x%.2x%.2x%.2x\n",
 217                         hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
 218 }
 219
 220 static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
 221 {
 222         struct hci_dev *hdev = dev_get_drvdata(dev);
 223         bdaddr_t bdaddr;
 224         baswap(&bdaddr, &hdev->bdaddr);
 225         return sprintf(buf, "%s\n", batostr(&bdaddr));
 226 }
 227
 228 static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
 229 {
 230         struct hci_dev *hdev = dev_get_drvdata(dev);
 231
 232         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 233                                 hdev->features[0], hdev->features[1],
 234                                 hdev->features[2], hdev->features[3],
 235                                 hdev->features[4], hdev->features[5],
 236                                 hdev->features[6], hdev->features[7]);
 237 }
 238
 239 static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
 240 {
 241         struct hci_dev *hdev = dev_get_drvdata(dev);
 242         return sprintf(buf, "%d\n", hdev->manufacturer);
 243 }
 244
 245 static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
 246 {
 247         struct hci_dev *hdev = dev_get_drvdata(dev);
 248         return sprintf(buf, "%d\n", hdev->hci_ver);
 249 }
 250
 251 static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
 252 {
 253         struct hci_dev *hdev = dev_get_drvdata(dev);
 254         return sprintf(buf, "%d\n", hdev->hci_rev);
 255 }
 256
 257 static ssize_t show_inquiry_cache(struct device *dev, struct device_attribute *attr, char *buf)
 258 {
 259         struct hci_dev *hdev = dev_get_drvdata(dev);
 260         struct inquiry_cache *cache = &hdev->inq_cache;
 261         struct inquiry_entry *e;
 262         int n = 0;
 263
 264         hci_dev_lock_bh(hdev);
 265
 266         for (e = cache->list; e; e = e->next) {
 267                 struct inquiry_data *data = &e->data;
 268                 bdaddr_t bdaddr;
 269                 baswap(&bdaddr, &data->bdaddr);
 270                 n += sprintf(buf + n, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
 271                                 batostr(&bdaddr),
 272                                 data->pscan_rep_mode, data->pscan_period_mode,
 273                                 data->pscan_mode, data->dev_class[2],
 274                                 data->dev_class[1], data->dev_class[0],
 275                                 __le16_to_cpu(data->clock_offset),
 276                                 data->rssi, data->ssp_mode, e->timestamp);
 277         }
 278
 279         hci_dev_unlock_bh(hdev);
 280         return n;
 281 }
 282
 283 static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 284 {
 285         struct hci_dev *hdev = dev_get_drvdata(dev);
 286         return sprintf(buf, "%d\n", hdev->idle_timeout);
 287 }
 288
 289 static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 290 {
 291         struct hci_dev *hdev = dev_get_drvdata(dev);
 292         char *ptr;
 293         __u32 val;
 294
 295         val = simple_strtoul(buf, &ptr, 10);
 296         if (ptr == buf)
 297                 return -EINVAL;
 298
 299         if (val != 0 && (val < 500 || val > 3600000))
 300                 return -EINVAL;
 301
 302         hdev->idle_timeout = val;
 303
 304         return count;
 305 }
 306
 307 static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
 308 {
 309         struct hci_dev *hdev = dev_get_drvdata(dev);
 310         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 311 }
 312
 313 static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 314 {
 315         struct hci_dev *hdev = dev_get_drvdata(dev);
 316         char *ptr;
 317         __u16 val;
 318
 319         val = simple_strtoul(buf, &ptr, 10);
 320         if (ptr == buf)
 321                 return -EINVAL;
 322
 323         if (val < 0x0002 || val > 0xFFFE || val % 2)
 324                 return -EINVAL;
 325
 326         if (val < hdev->sniff_min_interval)
 327                 return -EINVAL;
 328
 329         hdev->sniff_max_interval = val;
 330
 331         return count;
 332 }
 333
 334 static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
 335 {
 336         struct hci_dev *hdev = dev_get_drvdata(dev);
 337         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 338 }
 339
 340 static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 341 {
 342         struct hci_dev *hdev = dev_get_drvdata(dev);
 343         char *ptr;
 344         __u16 val;
 345
 346         val = simple_strtoul(buf, &ptr, 10);
 347         if (ptr == buf)
 348                 return -EINVAL;
 349
 350         if (val < 0x0002 || val > 0xFFFE || val % 2)
 351                 return -EINVAL;
 352
 353         if (val > hdev->sniff_max_interval)
 354                 return -EINVAL;
 355
 356         hdev->sniff_min_interval = val;
 357
 358         return count;
 359 }
 360
 361 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 362 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 363 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 364 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 365 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 366 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 367 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 368 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 369 static DEVICE_ATTR(inquiry_cache, S_IRUGO, show_inquiry_cache, NULL);
 370
 371 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 372                                 show_idle_timeout, store_idle_timeout);
 373 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 374                                 show_sniff_max_interval, store_sniff_max_interval);
 375 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 376                                 show_sniff_min_interval, store_sniff_min_interval);
 377
 378 static struct attribute *bt_host_attrs[] = {
 379         &dev_attr_type.attr,
 380         &dev_attr_name.attr,
 381         &dev_attr_class.attr,
 382         &dev_attr_address.attr,
 383         &dev_attr_features.attr,
 384         &dev_attr_manufacturer.attr,
 385         &dev_attr_hci_version.attr,
 386         &dev_attr_hci_revision.attr,
 387         &dev_attr_inquiry_cache.attr,
 388         &dev_attr_idle_timeout.attr,
 389         &dev_attr_sniff_max_interval.attr,
 390         &dev_attr_sniff_min_interval.attr,
 391         NULL
 392 };
 393
 394 static struct attribute_group bt_host_group = {
 395         .attrs = bt_host_attrs,
 396 };
 397
 398 static struct attribute_group *bt_host_groups[] = {
 399         &bt_host_group,
 400         NULL
 401 };
 402
 403 static void bt_host_release(struct device *dev)
 404 {
 405         void *data = dev_get_drvdata(dev);
 406         kfree(data);
 407 }
 408
 409 static struct device_type bt_host = {
 410         .name    = "host",
 411         .groups  = bt_host_groups,
 412         .release = bt_host_release,
 413 };
 414
 415 int hci_register_sysfs(struct hci_dev *hdev)
 416 {
 417         struct device *dev = &hdev->dev;
 418         int err;
 419
 420         BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);
 421
 422         dev->type = &bt_host;
 423         dev->class = bt_class;
 424         dev->parent = hdev->parent;
 425
 426         dev_set_name(dev, "%s", hdev->name);
 427
 428         dev_set_drvdata(dev, hdev);
 429
 430         err = device_register(dev);
 431         if (err < 0)
 432                 return err;
 433
 434         return 0;
 435 }
 436
 437 void hci_unregister_sysfs(struct hci_dev *hdev)
 438 {
 439         BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);
 440
 441         device_del(&hdev->dev);
 442 }
 443
 444 int __init bt_sysfs_init(void)
 445 {
 446         bt_workq = create_singlethread_workqueue("bluetooth");
 447         if (!bt_workq)
 448                 return -ENOMEM;
 449
 450         bt_class = class_create(THIS_MODULE, "bluetooth");
 451         if (IS_ERR(bt_class)) {
 452                 destroy_workqueue(bt_workq);
 453                 return PTR_ERR(bt_class);
 454         }
 455
 456         return 0;
 457 }
 458
 459 void bt_sysfs_cleanup(void)
 460 {
 461         destroy_workqueue(bt_workq);
 462
 463         class_destroy(bt_class);
 464 }