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 <linux/platform_device.h>
   7
   8 #include <net/bluetooth/bluetooth.h>
   9 #include <net/bluetooth/hci_core.h>
  10
  11 #ifndef CONFIG_BT_HCI_CORE_DEBUG
  12 #undef  BT_DBG
  13 #define BT_DBG(D...)
  14 #endif
  15 static struct workqueue_struct *btaddconn;
  16 static struct workqueue_struct *btdelconn;
  17
  18 static inline char *typetostr(int type)
  19 {
  20         switch (type) {
  21         case HCI_VIRTUAL:
  22                 return "VIRTUAL";
  23         case HCI_USB:
  24                 return "USB";
  25         case HCI_PCCARD:
  26                 return "PCCARD";
  27         case HCI_UART:
  28                 return "UART";
  29         case HCI_RS232:
  30                 return "RS232";
  31         case HCI_PCI:
  32                 return "PCI";
  33         case HCI_SDIO:
  34                 return "SDIO";
  35         default:
  36                 return "UNKNOWN";
  37         }
  38 }
  39
  40 static ssize_t show_type(struct device *dev, struct device_attribute *attr, char *buf)
  41 {
  42         struct hci_dev *hdev = dev_get_drvdata(dev);
  43         return sprintf(buf, "%s\n", typetostr(hdev->type));
  44 }
  45
  46 static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf)
  47 {
  48         struct hci_dev *hdev = dev_get_drvdata(dev);
  49         char name[249];
  50         int i;
  51
  52         for (i = 0; i < 248; i++)
  53                 name[i] = hdev->dev_name[i];
  54
  55         name[248] = '\0';
  56         return sprintf(buf, "%s\n", name);
  57 }
  58
  59 static ssize_t show_class(struct device *dev, struct device_attribute *attr, char *buf)
  60 {
  61         struct hci_dev *hdev = dev_get_drvdata(dev);
  62         return sprintf(buf, "0x%.2x%.2x%.2x\n",
  63                         hdev->dev_class[2], hdev->dev_class[1], hdev->dev_class[0]);
  64 }
  65
  66 static ssize_t show_address(struct device *dev, struct device_attribute *attr, char *buf)
  67 {
  68         struct hci_dev *hdev = dev_get_drvdata(dev);
  69         bdaddr_t bdaddr;
  70         baswap(&bdaddr, &hdev->bdaddr);
  71         return sprintf(buf, "%s\n", batostr(&bdaddr));
  72 }
  73
  74 static ssize_t show_features(struct device *dev, struct device_attribute *attr, char *buf)
  75 {
  76         struct hci_dev *hdev = dev_get_drvdata(dev);
  77
  78         return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
  79                                 hdev->features[0], hdev->features[1],
  80                                 hdev->features[2], hdev->features[3],
  81                                 hdev->features[4], hdev->features[5],
  82                                 hdev->features[6], hdev->features[7]);
  83 }
  84
  85 static ssize_t show_manufacturer(struct device *dev, struct device_attribute *attr, char *buf)
  86 {
  87         struct hci_dev *hdev = dev_get_drvdata(dev);
  88         return sprintf(buf, "%d\n", hdev->manufacturer);
  89 }
  90
  91 static ssize_t show_hci_version(struct device *dev, struct device_attribute *attr, char *buf)
  92 {
  93         struct hci_dev *hdev = dev_get_drvdata(dev);
  94         return sprintf(buf, "%d\n", hdev->hci_ver);
  95 }
  96
  97 static ssize_t show_hci_revision(struct device *dev, struct device_attribute *attr, char *buf)
  98 {
  99         struct hci_dev *hdev = dev_get_drvdata(dev);
 100         return sprintf(buf, "%d\n", hdev->hci_rev);
 101 }
 102
 103 static ssize_t show_inquiry_cache(struct device *dev, struct device_attribute *attr, char *buf)
 104 {
 105         struct hci_dev *hdev = dev_get_drvdata(dev);
 106         struct inquiry_cache *cache = &hdev->inq_cache;
 107         struct inquiry_entry *e;
 108         int n = 0;
 109
 110         hci_dev_lock_bh(hdev);
 111
 112         for (e = cache->list; e; e = e->next) {
 113                 struct inquiry_data *data = &e->data;
 114                 bdaddr_t bdaddr;
 115                 baswap(&bdaddr, &data->bdaddr);
 116                 n += sprintf(buf + n, "%s %d %d %d 0x%.2x%.2x%.2x 0x%.4x %d %u\n",
 117                                 batostr(&bdaddr),
 118                                 data->pscan_rep_mode, data->pscan_period_mode, data->pscan_mode,
 119                                 data->dev_class[2], data->dev_class[1], data->dev_class[0],
 120                                 __le16_to_cpu(data->clock_offset), data->rssi, e->timestamp);
 121         }
 122
 123         hci_dev_unlock_bh(hdev);
 124         return n;
 125 }
 126
 127 static ssize_t show_idle_timeout(struct device *dev, struct device_attribute *attr, char *buf)
 128 {
 129         struct hci_dev *hdev = dev_get_drvdata(dev);
 130         return sprintf(buf, "%d\n", hdev->idle_timeout);
 131 }
 132
 133 static ssize_t store_idle_timeout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 134 {
 135         struct hci_dev *hdev = dev_get_drvdata(dev);
 136         char *ptr;
 137         __u32 val;
 138
 139         val = simple_strtoul(buf, &ptr, 10);
 140         if (ptr == buf)
 141                 return -EINVAL;
 142
 143         if (val != 0 && (val < 500 || val > 3600000))
 144                 return -EINVAL;
 145
 146         hdev->idle_timeout = val;
 147
 148         return count;
 149 }
 150
 151 static ssize_t show_sniff_max_interval(struct device *dev, struct device_attribute *attr, char *buf)
 152 {
 153         struct hci_dev *hdev = dev_get_drvdata(dev);
 154         return sprintf(buf, "%d\n", hdev->sniff_max_interval);
 155 }
 156
 157 static ssize_t store_sniff_max_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 158 {
 159         struct hci_dev *hdev = dev_get_drvdata(dev);
 160         char *ptr;
 161         __u16 val;
 162
 163         val = simple_strtoul(buf, &ptr, 10);
 164         if (ptr == buf)
 165                 return -EINVAL;
 166
 167         if (val < 0x0002 || val > 0xFFFE || val % 2)
 168                 return -EINVAL;
 169
 170         if (val < hdev->sniff_min_interval)
 171                 return -EINVAL;
 172
 173         hdev->sniff_max_interval = val;
 174
 175         return count;
 176 }
 177
 178 static ssize_t show_sniff_min_interval(struct device *dev, struct device_attribute *attr, char *buf)
 179 {
 180         struct hci_dev *hdev = dev_get_drvdata(dev);
 181         return sprintf(buf, "%d\n", hdev->sniff_min_interval);
 182 }
 183
 184 static ssize_t store_sniff_min_interval(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 185 {
 186         struct hci_dev *hdev = dev_get_drvdata(dev);
 187         char *ptr;
 188         __u16 val;
 189
 190         val = simple_strtoul(buf, &ptr, 10);
 191         if (ptr == buf)
 192                 return -EINVAL;
 193
 194         if (val < 0x0002 || val > 0xFFFE || val % 2)
 195                 return -EINVAL;
 196
 197         if (val > hdev->sniff_max_interval)
 198                 return -EINVAL;
 199
 200         hdev->sniff_min_interval = val;
 201
 202         return count;
 203 }
 204
 205 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 206 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 207 static DEVICE_ATTR(class, S_IRUGO, show_class, NULL);
 208 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 209 static DEVICE_ATTR(features, S_IRUGO, show_features, NULL);
 210 static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL);
 211 static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL);
 212 static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL);
 213 static DEVICE_ATTR(inquiry_cache, S_IRUGO, show_inquiry_cache, NULL);
 214
 215 static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR,
 216                                 show_idle_timeout, store_idle_timeout);
 217 static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR,
 218                                 show_sniff_max_interval, store_sniff_max_interval);
 219 static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR,
 220                                 show_sniff_min_interval, store_sniff_min_interval);
 221
 222 static struct device_attribute *bt_attrs[] = {
 223         &dev_attr_type,
 224         &dev_attr_name,
 225         &dev_attr_class,
 226         &dev_attr_address,
 227         &dev_attr_features,
 228         &dev_attr_manufacturer,
 229         &dev_attr_hci_version,
 230         &dev_attr_hci_revision,
 231         &dev_attr_inquiry_cache,
 232         &dev_attr_idle_timeout,
 233         &dev_attr_sniff_max_interval,
 234         &dev_attr_sniff_min_interval,
 235         NULL
 236 };
 237
 238 static ssize_t show_conn_type(struct device *dev, struct device_attribute *attr, char *buf)
 239 {
 240         struct hci_conn *conn = dev_get_drvdata(dev);
 241         return sprintf(buf, "%s\n", conn->type == ACL_LINK ? "ACL" : "SCO");
 242 }
 243
 244 static ssize_t show_conn_address(struct device *dev, struct device_attribute *attr, char *buf)
 245 {
 246         struct hci_conn *conn = dev_get_drvdata(dev);
 247         bdaddr_t bdaddr;
 248         baswap(&bdaddr, &conn->dst);
 249         return sprintf(buf, "%s\n", batostr(&bdaddr));
 250 }
 251
 252 #define CONN_ATTR(_name,_mode,_show,_store) \
 253 struct device_attribute conn_attr_##_name = __ATTR(_name,_mode,_show,_store)
 254
 255 static CONN_ATTR(type, S_IRUGO, show_conn_type, NULL);
 256 static CONN_ATTR(address, S_IRUGO, show_conn_address, NULL);
 257
 258 static struct device_attribute *conn_attrs[] = {
 259         &conn_attr_type,
 260         &conn_attr_address,
 261         NULL
 262 };
 263
 264 struct class *bt_class = NULL;
 265 EXPORT_SYMBOL_GPL(bt_class);
 266
 267 static struct bus_type bt_bus = {
 268         .name   = "bluetooth",
 269 };
 270
 271 static struct platform_device *bt_platform;
 272
 273 static void bt_release(struct device *dev)
 274 {
 275         void *data = dev_get_drvdata(dev);
 276         kfree(data);
 277 }
 278
 279 static void add_conn(struct work_struct *work)
 280 {
 281         struct hci_conn *conn = container_of(work, struct hci_conn, work);
 282         int i;
 283
 284         flush_workqueue(btdelconn);
 285
 286         if (device_add(&conn->dev) < 0) {
 287                 BT_ERR("Failed to register connection device");
 288                 return;
 289         }
 290
 291         for (i = 0; conn_attrs[i]; i++)
 292                 if (device_create_file(&conn->dev, conn_attrs[i]) < 0)
 293                         BT_ERR("Failed to create connection attribute");
 294 }
 295
 296 void hci_conn_add_sysfs(struct hci_conn *conn)
 297 {
 298         struct hci_dev *hdev = conn->hdev;
 299         bdaddr_t *ba = &conn->dst;
 300
 301         BT_DBG("conn %p", conn);
 302
 303         conn->dev.bus = &bt_bus;
 304         conn->dev.parent = &hdev->dev;
 305
 306         conn->dev.release = bt_release;
 307
 308         snprintf(conn->dev.bus_id, BUS_ID_SIZE,
 309                         "%s%2.2X%2.2X%2.2X%2.2X%2.2X%2.2X",
 310                         conn->type == ACL_LINK ? "acl" : "sco",
 311                         ba->b[5], ba->b[4], ba->b[3],
 312                         ba->b[2], ba->b[1], ba->b[0]);
 313
 314         dev_set_drvdata(&conn->dev, conn);
 315
 316         device_initialize(&conn->dev);
 317
 318         INIT_WORK(&conn->work, add_conn);
 319
 320         queue_work(btaddconn, &conn->work);
 321 }
 322
 323 static int __match_tty(struct device *dev, void *data)
 324 {
 325         /* The rfcomm tty device will possibly retain even when conn
 326          * is down, and sysfs doesn't support move zombie device,
 327          * so we should move the device before conn device is destroyed.
 328          * Due to the only child device of hci_conn dev is rfcomm
 329          * tty_dev, here just return 1
 330          */
 331         return 1;
 332 }
 333
 334 static void del_conn(struct work_struct *work)
 335 {
 336         struct hci_conn *conn = container_of(work, struct hci_conn, work);
 337         struct hci_dev *hdev = conn->hdev;
 338
 339         while (1) {
 340                 struct device *dev;
 341
 342                 dev = device_find_child(&conn->dev, NULL, __match_tty);
 343                 if (!dev)
 344                         break;
 345                 device_move(dev, NULL);
 346                 put_device(dev);
 347         }
 348
 349         device_del(&conn->dev);
 350         put_device(&conn->dev);
 351         hci_dev_put(hdev);
 352 }
 353
 354 void hci_conn_del_sysfs(struct hci_conn *conn)
 355 {
 356         BT_DBG("conn %p", conn);
 357
 358         if (!device_is_registered(&conn->dev))
 359                 return;
 360
 361         INIT_WORK(&conn->work, del_conn);
 362
 363         queue_work(btdelconn, &conn->work);
 364 }
 365
 366 int hci_register_sysfs(struct hci_dev *hdev)
 367 {
 368         struct device *dev = &hdev->dev;
 369         unsigned int i;
 370         int err;
 371
 372         BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);
 373
 374         dev->bus = &bt_bus;
 375         dev->parent = hdev->parent;
 376
 377         strlcpy(dev->bus_id, hdev->name, BUS_ID_SIZE);
 378
 379         dev->release = bt_release;
 380
 381         dev_set_drvdata(dev, hdev);
 382
 383         err = device_register(dev);
 384         if (err < 0)
 385                 return err;
 386
 387         for (i = 0; bt_attrs[i]; i++)
 388                 if (device_create_file(dev, bt_attrs[i]) < 0)
 389                         BT_ERR("Failed to create device attribute");
 390
 391         if (sysfs_create_link(&bt_class->subsys.kobj,
 392                                 &dev->kobj, kobject_name(&dev->kobj)) < 0)
 393                 BT_ERR("Failed to create class symlink");
 394
 395         return 0;
 396 }
 397
 398 void hci_unregister_sysfs(struct hci_dev *hdev)
 399 {
 400         BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type);
 401
 402         sysfs_remove_link(&bt_class->subsys.kobj,
 403                                         kobject_name(&hdev->dev.kobj));
 404
 405         device_del(&hdev->dev);
 406 }
 407
 408 int __init bt_sysfs_init(void)
 409 {
 410         int err;
 411
 412         btaddconn = create_singlethread_workqueue("btaddconn");
 413         if (!btaddconn) {
 414                 err = -ENOMEM;
 415                 goto out;
 416         }
 417
 418         btdelconn = create_singlethread_workqueue("btdelconn");
 419         if (!btdelconn) {
 420                 err = -ENOMEM;
 421                 goto out_del;
 422         }
 423
 424         bt_platform = platform_device_register_simple("bluetooth", -1, NULL, 0);
 425         if (IS_ERR(bt_platform)) {
 426                 err = PTR_ERR(bt_platform);
 427                 goto out_platform;
 428         }
 429
 430         err = bus_register(&bt_bus);
 431         if (err < 0)
 432                 goto out_bus;
 433
 434         bt_class = class_create(THIS_MODULE, "bluetooth");
 435         if (IS_ERR(bt_class)) {
 436                 err = PTR_ERR(bt_class);
 437                 goto out_class;
 438         }
 439
 440         return 0;
 441
 442 out_class:
 443         bus_unregister(&bt_bus);
 444 out_bus:
 445         platform_device_unregister(bt_platform);
 446 out_platform:
 447         destroy_workqueue(btdelconn);
 448 out_del:
 449         destroy_workqueue(btaddconn);
 450 out:
 451         return err;
 452 }
 453
 454 void bt_sysfs_cleanup(void)
 455 {
 456         destroy_workqueue(btaddconn);
 457
 458         destroy_workqueue(btdelconn);
 459
 460         class_destroy(bt_class);
 461
 462         bus_unregister(&bt_bus);
 463
 464         platform_device_unregister(bt_platform);
 465 }