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
  92         /* ensure previous del is complete */
  93         flush_work(&conn->work_del);
  94
  95         if (device_add(&conn->dev) < 0) {
  96                 BT_ERR("Failed to register connection device");
  97                 return;
  98         }
  99 }
 100
 101 /*
 102  * The rfcomm tty device will possibly retain even when conn
 103  * is down, and sysfs doesn't support move zombie device,
 104  * so we should move the device before conn device is destroyed.
 105  */
 106 static int __match_tty(struct device *dev, void *data)
 107 {
 108         return !strncmp(dev_name(dev), "rfcomm", 6);
 109 }
 110
 111 static void del_conn(struct work_struct *work)
 112 {
 113         struct hci_conn *conn = container_of(work, struct hci_conn, work_del);
 114         struct hci_dev *hdev = conn->hdev;
 115
 116         /* ensure previous add is complete */
 117         flush_work(&conn->work_add);
 118
 119         if (!device_is_registered(&conn->dev))
 120                 return;
 121
 122         while (1) {
 123                 struct device *dev;
 124
 125                 dev = device_find_child(&conn->dev, NULL, __match_tty);
 126                 if (!dev)
 127                         break;
 128                 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
 129                 put_device(dev);
 130         }
 131
 132         device_del(&conn->dev);
 133         put_device(&conn->dev);
 134         hci_dev_put(hdev);
 135 }
 136
 137 void hci_conn_init_sysfs(struct hci_conn *conn)
 138 {
 139         struct hci_dev *hdev = conn->hdev;
 140
 141         BT_DBG("conn %p", conn);
 142
 143         conn->dev.type = &bt_link;
 144         conn->dev.class = bt_class;
 145         conn->dev.parent = &hdev->dev;
 146
 147         dev_set_drvdata(&conn->dev, conn);
 148
 149         device_initialize(&conn->dev);
 150
 151         INIT_WORK(&conn->work_add, add_conn);
 152         INIT_WORK(&conn->work_del, del_conn);
 153 }
 154
 155 void hci_conn_add_sysfs(struct hci_conn *conn)
 156 {
 157         struct hci_dev *hdev = conn->hdev;
 158
 159         BT_DBG("conn %p", conn);
 160
 161         dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
 162
 163         queue_work(bt_workq, &conn->work_add);
 164 }
 165
 166 void hci_conn_del_sysfs(struct hci_conn *conn)
 167 {
 168         BT_DBG("conn %p", conn);
 169
 170         queue_work(bt_workq, &conn->work_del);
 171 }
 172
 173 static inline char *host_typetostr(int type)
 174 {
 175         switch (type) {
 176         case HCI_VIRTUAL:
 177                 return "VIRTUAL";
 178         case HCI_USB:
 179                 return "USB";
 180         case HCI_PCCARD:
 181                 return "PCCARD";
 182         case HCI_UART:
 183                 return "UART";
 184         case HCI_RS232:
 185                 return "RS232";
 186         case HCI_PCI:
 187                 return "PCI";
 188         case HCI_SDIO:
 189                 return "SDIO";
 190         default:
 191                 return "UNKNOWN";
 192         }
 193 }
 194
 195 static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
 196 {
 197         struct hci_dev *hdev = dev_get_drvdata(dev);
 198         return sprintf(buf, "%s\n", host_typetostr(hdev->type));
 199 }
 200
 201 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
 202 {
 203         struct hci_dev *hdev = dev_get_drvdata(dev);
 204         char name[249];
 205         int i;
 206
 207         for (i = 0; i < 248; i++)
 208                 name[i] = hdev->dev_name[i];
 209
 210         name[248] = '\0';
 211         return sprintf(buf, "%s\n", name);
 212 }
 213
 214 static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
 215 {
 216         struct hci_dev *hdev = dev_get_drvdata(dev);
 217         return sprintf(buf, "0x%.2x%.2x%.2x\n",
 218                         hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
 219 }
 220
 221 static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
 222 {
 223         struct hci_dev *hdev = dev_get_drvdata(dev);
 224         bdaddr_t bdaddr;
 225         baswap(&bdaddr, &hdev->bdaddr);
 226         return sprintf(buf, "%s\n", batostr(&bdaddr));
 227 }
 228
 229 static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
 230 {
 231         struct hci_dev *hdev = dev_get_drvdata(dev);
 232
 233         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 234                                 hdev->features[0], hdev->features[1],
 235                                 hdev->features[2], hdev->features[3],
 236                                 hdev->features[4], hdev->features[5],
 237                                 hdev->features[6], hdev->features[7]);
 238 }
 239
 240 static ssize_t show_manufacturer(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->manufacturer);
 244 }
 245
 246 static ssize_t show_hci_version(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_ver);
 250 }
 251
 252 static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
 253 {
 254         struct hci_dev *hdev = dev_get_drvdata(dev);
 255         return sprintf(buf, "%d\n", hdev->hci_rev);
 256 }
 257
 258 static ssize_t show_inquiry_cache(struct device *dev, struct device_attribute *attr, char *buf)
 259 {
 260         struct hci_dev *hdev = dev_get_drvdata(dev);
 261         struct inquiry_cache *cache = &hdev->inq_cache;
 262         struct inquiry_entry *e;
 263         int n = 0;
 264
 265         hci_dev_lock_bh(hdev);
 266
 267         for (e = cache->list; e; e = e->next) {
 268                 struct inquiry_data *data = &e->data;
 269                 bdaddr_t bdaddr;
 270                 baswap(&bdaddr, &data->bdaddr);
 271                 n += sprintf(buf + n, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %d %u\n",
 272                                 batostr(&bdaddr),
 273                                 data->pscan_rep_mode, data->pscan_period_mode,
 274                                 data->pscan_mode, data->dev_class[2],
 275                                 data->dev_class[1], data->dev_class[0],
 276                                 __le16_to_cpu(data->clock_offset),
 277                                 data->rssi, data->ssp_mode, e->timestamp);
 278         }
 279
 280         hci_dev_unlock_bh(hdev);
 281         return n;
 282 }
 283
 284 static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 285 {
 286         struct hci_dev *hdev = dev_get_drvdata(dev);
 287         return sprintf(buf, "%d\n", hdev->idle_timeout);
 288 }
 289
 290 static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 291 {
 292         struct hci_dev *hdev = dev_get_drvdata(dev);
 293         char *ptr;
 294         __u32 val;
 295
 296         val = simple_strtoul(buf, &ptr, 10);
 297         if (ptr == buf)
 298                 return -EINVAL;
 299
 300         if (val != 0 && (val < 500 || val > 3600000))
 301                 return -EINVAL;
 302
 303         hdev->idle_timeout = val;
 304
 305         return count;
 306 }
 307
 308 static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
 309 {
 310         struct hci_dev *hdev = dev_get_drvdata(dev);
 311         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 312 }
 313
 314 static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 315 {
 316         struct hci_dev *hdev = dev_get_drvdata(dev);
 317         char *ptr;
 318         __u16 val;
 319
 320         val = simple_strtoul(buf, &ptr, 10);
 321         if (ptr == buf)
 322                 return -EINVAL;
 323
 324         if (val < 0x0002 || val > 0xFFFE || val % 2)
 325                 return -EINVAL;
 326
 327         if (val < hdev->sniff_min_interval)
 328                 return -EINVAL;
 329
 330         hdev->sniff_max_interval = val;
 331
 332         return count;
 333 }
 334
 335 static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
 336 {
 337         struct hci_dev *hdev = dev_get_drvdata(dev);
 338         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 339 }
 340
 341 static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 342 {
 343         struct hci_dev *hdev = dev_get_drvdata(dev);
 344         char *ptr;
 345         __u16 val;
 346
 347         val = simple_strtoul(buf, &ptr, 10);
 348         if (ptr == buf)
 349                 return -EINVAL;
 350
 351         if (val < 0x0002 || val > 0xFFFE || val % 2)
 352                 return -EINVAL;
 353
 354         if (val > hdev->sniff_max_interval)
 355                 return -EINVAL;
 356
 357         hdev->sniff_min_interval = val;
 358
 359         return count;
 360 }
 361
 362 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 363 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 364 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 365 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 366 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 367 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 368 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 369 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 370 static DEVICE_ATTR(inquiry_cache, S_IRUGO, show_inquiry_cache, NULL);
 371
 372 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 373                                 show_idle_timeout, store_idle_timeout);
 374 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 375                                 show_sniff_max_interval, store_sniff_max_interval);
 376 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 377                                 show_sniff_min_interval, store_sniff_min_interval);
 378
 379 static struct attribute *bt_host_attrs[] = {
 380         &dev_attr_type.attr,
 381         &dev_attr_name.attr,
 382         &dev_attr_class.attr,
 383         &dev_attr_address.attr,
 384         &dev_attr_features.attr,
 385         &dev_attr_manufacturer.attr,
 386         &dev_attr_hci_version.attr,
 387         &dev_attr_hci_revision.attr,
 388         &dev_attr_inquiry_cache.attr,
 389         &dev_attr_idle_timeout.attr,
 390         &dev_attr_sniff_max_interval.attr,
 391         &dev_attr_sniff_min_interval.attr,
 392         NULL
 393 };
 394
 395 static struct attribute_group bt_host_group = {
 396         .attrs = bt_host_attrs,
 397 };
 398
 399 static struct attribute_group *bt_host_groups[] = {
 400         &bt_host_group,
 401         NULL
 402 };
 403
 404 static void bt_host_release(struct device *dev)
 405 {
 406         void *data = dev_get_drvdata(dev);
 407         kfree(data);
 408 }
 409
 410 static struct device_type bt_host = {
 411         .name    = "host",
 412         .groups  = bt_host_groups,
 413         .release = bt_host_release,
 414 };
 415
 416 int hci_register_sysfs(struct hci_dev *hdev)
 417 {
 418         struct device *dev = &hdev->dev;
 419         int err;
 420
 421         BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);
 422
 423         dev->type = &bt_host;
 424         dev->class = bt_class;
 425         dev->parent = hdev->parent;
 426
 427         dev_set_name(dev, "%s", hdev->name);
 428
 429         dev_set_drvdata(dev, hdev);
 430
 431         err = device_register(dev);
 432         if (err < 0)
 433                 return err;
 434
 435         return 0;
 436 }
 437
 438 void hci_unregister_sysfs(struct hci_dev *hdev)
 439 {
 440         BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);
 441
 442         device_del(&hdev->dev);
 443 }
 444
 445 int __init bt_sysfs_init(void)
 446 {
 447         bt_workq = create_singlethread_workqueue("bluetooth");
 448         if (!bt_workq)
 449                 return -ENOMEM;
 450
 451         bt_class = class_create(THIS_MODULE, "bluetooth");
 452         if (IS_ERR(bt_class)) {
 453                 destroy_workqueue(bt_workq);
 454                 return PTR_ERR(bt_class);
 455         }
 456
 457         return 0;
 458 }
 459
 460 void bt_sysfs_cleanup(void)
 461 {
 462         destroy_workqueue(bt_workq);
 463
 464         class_destroy(bt_class);
 465 }