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