net/bluetooth/hci_sysfs.c

   1 /* Bluetooth HCI driver model support. */
   2
   3 #include <linux/debugfs.h>
   4 #include <linux/module.h>
   5
   6 #include <net/bluetooth/bluetooth.h>
   7 #include <net/bluetooth/hci_core.h>
   8
   9 static struct class *bt_class;
  10
  11 struct dentry *bt_debugfs;
  12 EXPORT_SYMBOL_GPL(bt_debugfs);
  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         case LE_LINK:
  24                 return "LE";
  25         default:
  26                 return "UNKNOWN";
  27         }
  28 }
  29
  30 static ssize_t show_link_type(struct device *dev,
  31                               struct device_attribute *attr, char *buf)
  32 {
  33         struct hci_conn *conn = to_hci_conn(dev);
  34         return sprintf(buf, "%s\n", link_typetostr(conn->type));
  35 }
  36
  37 static ssize_t show_link_address(struct device *dev,
  38                                  struct device_attribute *attr, char *buf)
  39 {
  40         struct hci_conn *conn = to_hci_conn(dev);
  41         return sprintf(buf, "%pMR\n", &conn->dst);
  42 }
  43
  44 static ssize_t show_link_features(struct device *dev,
  45                                   struct device_attribute *attr, char *buf)
  46 {
  47         struct hci_conn *conn = to_hci_conn(dev);
  48
  49         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
  50                        conn->features[0][0], conn->features[0][1],
  51                        conn->features[0][2], conn->features[0][3],
  52                        conn->features[0][4], conn->features[0][5],
  53                        conn->features[0][6], conn->features[0][7]);
  54 }
  55
  56 #define LINK_ATTR(_name, _mode, _show, _store) \
  57 struct device_attribute link_attr_##_name = __ATTR(_name, _mode, _show, _store)
  58
  59 static LINK_ATTR(type, S_IRUGO, show_link_type, NULL);
  60 static LINK_ATTR(address, S_IRUGO, show_link_address, NULL);
  61 static LINK_ATTR(features, S_IRUGO, show_link_features, NULL);
  62
  63 static struct attribute *bt_link_attrs[] = {
  64         &link_attr_type.attr,
  65         &link_attr_address.attr,
  66         &link_attr_features.attr,
  67         NULL
  68 };
  69
  70 static struct attribute_group bt_link_group = {
  71         .attrs = bt_link_attrs,
  72 };
  73
  74 static const struct attribute_group *bt_link_groups[] = {
  75         &bt_link_group,
  76         NULL
  77 };
  78
  79 static void bt_link_release(struct device *dev)
  80 {
  81         struct hci_conn *conn = to_hci_conn(dev);
  82         kfree(conn);
  83 }
  84
  85 static struct device_type bt_link = {
  86         .name    = "link",
  87         .groups  = bt_link_groups,
  88         .release = bt_link_release,
  89 };
  90
  91 /*
  92  * The rfcomm tty device will possibly retain even when conn
  93  * is down, and sysfs doesn't support move zombie device,
  94  * so we should move the device before conn device is destroyed.
  95  */
  96 static int __match_tty(struct device *dev, void *data)
  97 {
  98         return !strncmp(dev_name(dev), "rfcomm", 6);
  99 }
 100
 101 void hci_conn_init_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         device_initialize(&conn->dev);
 112 }
 113
 114 void hci_conn_add_sysfs(struct hci_conn *conn)
 115 {
 116         struct hci_dev *hdev = conn->hdev;
 117
 118         BT_DBG("conn %p", conn);
 119
 120         dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
 121
 122         if (device_add(&conn->dev) < 0) {
 123                 BT_ERR("Failed to register connection device");
 124                 return;
 125         }
 126
 127         hci_dev_hold(hdev);
 128 }
 129
 130 void hci_conn_del_sysfs(struct hci_conn *conn)
 131 {
 132         struct hci_dev *hdev = conn->hdev;
 133
 134         if (!device_is_registered(&conn->dev))
 135                 return;
 136
 137         while (1) {
 138                 struct device *dev;
 139
 140                 dev = device_find_child(&conn->dev, NULL, __match_tty);
 141                 if (!dev)
 142                         break;
 143                 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
 144                 put_device(dev);
 145         }
 146
 147         device_del(&conn->dev);
 148
 149         hci_dev_put(hdev);
 150 }
 151
 152 static inline char *host_bustostr(int bus)
 153 {
 154         switch (bus) {
 155         case HCI_VIRTUAL:
 156                 return "VIRTUAL";
 157         case HCI_USB:
 158                 return "USB";
 159         case HCI_PCCARD:
 160                 return "PCCARD";
 161         case HCI_UART:
 162                 return "UART";
 163         case HCI_RS232:
 164                 return "RS232";
 165         case HCI_PCI:
 166                 return "PCI";
 167         case HCI_SDIO:
 168                 return "SDIO";
 169         default:
 170                 return "UNKNOWN";
 171         }
 172 }
 173
 174 static inline char *host_typetostr(int type)
 175 {
 176         switch (type) {
 177         case HCI_BREDR:
 178                 return "BR/EDR";
 179         case HCI_AMP:
 180                 return "AMP";
 181         default:
 182                 return "UNKNOWN";
 183         }
 184 }
 185
 186 static ssize_t show_bus(struct device *dev,
 187                         struct device_attribute *attr, char *buf)
 188 {
 189         struct hci_dev *hdev = to_hci_dev(dev);
 190         return sprintf(buf, "%s\n", host_bustostr(hdev->bus));
 191 }
 192
 193 static ssize_t show_type(struct device *dev,
 194                          struct device_attribute *attr, char *buf)
 195 {
 196         struct hci_dev *hdev = to_hci_dev(dev);
 197         return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type));
 198 }
 199
 200 static ssize_t show_name(struct device *dev,
 201                          struct device_attribute *attr, char *buf)
 202 {
 203         struct hci_dev *hdev = to_hci_dev(dev);
 204         char name[HCI_MAX_NAME_LENGTH + 1];
 205         int i;
 206
 207         for (i = 0; i < HCI_MAX_NAME_LENGTH; i++)
 208                 name[i] = hdev->dev_name[i];
 209
 210         name[HCI_MAX_NAME_LENGTH] = '\0';
 211         return sprintf(buf, "%s\n", name);
 212 }
 213
 214 static ssize_t show_class(struct device *dev,
 215                           struct device_attribute *attr, char *buf)
 216 {
 217         struct hci_dev *hdev = to_hci_dev(dev);
 218         return sprintf(buf, "0x%.2x%.2x%.2x\n", hdev->dev_class[2],
 219                        hdev->dev_class[1], hdev->dev_class[0]);
 220 }
 221
 222 static ssize_t show_address(struct device *dev,
 223                             struct device_attribute *attr, char *buf)
 224 {
 225         struct hci_dev *hdev = to_hci_dev(dev);
 226         return sprintf(buf, "%pMR\n", &hdev->bdaddr);
 227 }
 228
 229 static ssize_t show_features(struct device *dev,
 230                              struct device_attribute *attr, char *buf)
 231 {
 232         struct hci_dev *hdev = to_hci_dev(dev);
 233
 234         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 235                        hdev->features[0][0], hdev->features[0][1],
 236                        hdev->features[0][2], hdev->features[0][3],
 237                        hdev->features[0][4], hdev->features[0][5],
 238                        hdev->features[0][6], hdev->features[0][7]);
 239 }
 240
 241 static ssize_t show_manufacturer(struct device *dev,
 242                                  struct device_attribute *attr, char *buf)
 243 {
 244         struct hci_dev *hdev = to_hci_dev(dev);
 245         return sprintf(buf, "%d\n", hdev->manufacturer);
 246 }
 247
 248 static ssize_t show_hci_version(struct device *dev,
 249                                 struct device_attribute *attr, char *buf)
 250 {
 251         struct hci_dev *hdev = to_hci_dev(dev);
 252         return sprintf(buf, "%d\n", hdev->hci_ver);
 253 }
 254
 255 static ssize_t show_hci_revision(struct device *dev,
 256                                  struct device_attribute *attr, char *buf)
 257 {
 258         struct hci_dev *hdev = to_hci_dev(dev);
 259         return sprintf(buf, "%d\n", hdev->hci_rev);
 260 }
 261
 262 static ssize_t show_idle_timeout(struct device *dev,
 263                                  struct device_attribute *attr, char *buf)
 264 {
 265         struct hci_dev *hdev = to_hci_dev(dev);
 266         return sprintf(buf, "%d\n", hdev->idle_timeout);
 267 }
 268
 269 static ssize_t store_idle_timeout(struct device *dev,
 270                                   struct device_attribute *attr,
 271                                   const char *buf, size_t count)
 272 {
 273         struct hci_dev *hdev = to_hci_dev(dev);
 274         unsigned int val;
 275         int rv;
 276
 277         rv = kstrtouint(buf, 0, &val);
 278         if (rv < 0)
 279                 return rv;
 280
 281         if (val != 0 && (val < 500 || val > 3600000))
 282                 return -EINVAL;
 283
 284         hdev->idle_timeout = val;
 285
 286         return count;
 287 }
 288
 289 static ssize_t show_sniff_max_interval(struct device *dev,
 290                                        struct device_attribute *attr, char *buf)
 291 {
 292         struct hci_dev *hdev = to_hci_dev(dev);
 293         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 294 }
 295
 296 static ssize_t store_sniff_max_interval(struct device *dev,
 297                                         struct device_attribute *attr,
 298                                         const char *buf, size_t count)
 299 {
 300         struct hci_dev *hdev = to_hci_dev(dev);
 301         u16 val;
 302         int rv;
 303
 304         rv = kstrtou16(buf, 0, &val);
 305         if (rv < 0)
 306                 return rv;
 307
 308         if (val == 0 || val % 2 || val < hdev->sniff_min_interval)
 309                 return -EINVAL;
 310
 311         hdev->sniff_max_interval = val;
 312
 313         return count;
 314 }
 315
 316 static ssize_t show_sniff_min_interval(struct device *dev,
 317                                        struct device_attribute *attr, char *buf)
 318 {
 319         struct hci_dev *hdev = to_hci_dev(dev);
 320         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 321 }
 322
 323 static ssize_t store_sniff_min_interval(struct device *dev,
 324                                         struct device_attribute *attr,
 325                                         const char *buf, size_t count)
 326 {
 327         struct hci_dev *hdev = to_hci_dev(dev);
 328         u16 val;
 329         int rv;
 330
 331         rv = kstrtou16(buf, 0, &val);
 332         if (rv < 0)
 333                 return rv;
 334
 335         if (val == 0 || val % 2 || val > hdev->sniff_max_interval)
 336                 return -EINVAL;
 337
 338         hdev->sniff_min_interval = val;
 339
 340         return count;
 341 }
 342
 343 static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL);
 344 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 345 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 346 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 347 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 348 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 349 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 350 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 351 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 352
 353 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 354                    show_idle_timeout, store_idle_timeout);
 355 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 356                    show_sniff_max_interval, store_sniff_max_interval);
 357 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 358                    show_sniff_min_interval, store_sniff_min_interval);
 359
 360 static struct attribute *bt_host_attrs[] = {
 361         &dev_attr_bus.attr,
 362         &dev_attr_type.attr,
 363         &dev_attr_name.attr,
 364         &dev_attr_class.attr,
 365         &dev_attr_address.attr,
 366         &dev_attr_features.attr,
 367         &dev_attr_manufacturer.attr,
 368         &dev_attr_hci_version.attr,
 369         &dev_attr_hci_revision.attr,
 370         &dev_attr_idle_timeout.attr,
 371         &dev_attr_sniff_max_interval.attr,
 372         &dev_attr_sniff_min_interval.attr,
 373         NULL
 374 };
 375
 376 static struct attribute_group bt_host_group = {
 377         .attrs = bt_host_attrs,
 378 };
 379
 380 static const struct attribute_group *bt_host_groups[] = {
 381         &bt_host_group,
 382         NULL
 383 };
 384
 385 static void bt_host_release(struct device *dev)
 386 {
 387         struct hci_dev *hdev = to_hci_dev(dev);
 388         kfree(hdev);
 389         module_put(THIS_MODULE);
 390 }
 391
 392 static struct device_type bt_host = {
 393         .name    = "host",
 394         .groups  = bt_host_groups,
 395         .release = bt_host_release,
 396 };
 397
 398 void hci_init_sysfs(struct hci_dev *hdev)
 399 {
 400         struct device *dev = &hdev->dev;
 401
 402         dev->type = &bt_host;
 403         dev->class = bt_class;
 404
 405         __module_get(THIS_MODULE);
 406         device_initialize(dev);
 407 }
 408
 409 int hci_add_sysfs(struct hci_dev *hdev)
 410 {
 411         struct device *dev = &hdev->dev;
 412         int err;
 413
 414         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 415
 416         dev_set_name(dev, "%s", hdev->name);
 417
 418         err = device_add(dev);
 419         if (err < 0)
 420                 return err;
 421
 422         if (!bt_debugfs)
 423                 return 0;
 424
 425         hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs);
 426         if (!hdev->debugfs)
 427                 return 0;
 428
 429         return 0;
 430 }
 431
 432 void hci_del_sysfs(struct hci_dev *hdev)
 433 {
 434         BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus);
 435
 436         debugfs_remove_recursive(hdev->debugfs);
 437
 438         device_del(&hdev->dev);
 439 }
 440
 441 int __init bt_sysfs_init(void)
 442 {
 443         bt_debugfs = debugfs_create_dir("bluetooth", NULL);
 444
 445         bt_class = class_create(THIS_MODULE, "bluetooth");
 446
 447         return PTR_ERR_OR_ZERO(bt_class);
 448 }
 449
 450 void bt_sysfs_cleanup(void)
 451 {
 452         class_destroy(bt_class);
 453
 454         debugfs_remove_recursive(bt_debugfs);
 455 }