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