hci_sysfs.c revision ebd1e33bb2167798197e79d277d7ead14013e489
1/* Bluetooth HCI driver model support. */ 2 3#include <linux/debugfs.h> 4#include <linux/module.h> 5#include <asm/unaligned.h> 6 7#include <net/bluetooth/bluetooth.h> 8#include <net/bluetooth/hci_core.h> 9 10static struct class *bt_class; 11 12struct dentry *bt_debugfs; 13EXPORT_SYMBOL_GPL(bt_debugfs); 14 15static inline char *link_typetostr(int type) 16{ 17 switch (type) { 18 case ACL_LINK: 19 return "ACL"; 20 case SCO_LINK: 21 return "SCO"; 22 case ESCO_LINK: 23 return "eSCO"; 24 case LE_LINK: 25 return "LE"; 26 default: 27 return "UNKNOWN"; 28 } 29} 30 31static ssize_t show_link_type(struct device *dev, 32 struct device_attribute *attr, char *buf) 33{ 34 struct hci_conn *conn = to_hci_conn(dev); 35 return sprintf(buf, "%s\n", link_typetostr(conn->type)); 36} 37 38static ssize_t show_link_address(struct device *dev, 39 struct device_attribute *attr, char *buf) 40{ 41 struct hci_conn *conn = to_hci_conn(dev); 42 return sprintf(buf, "%pMR\n", &conn->dst); 43} 44 45static ssize_t show_link_features(struct device *dev, 46 struct device_attribute *attr, char *buf) 47{ 48 struct hci_conn *conn = to_hci_conn(dev); 49 50 return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n", 51 conn->features[0][0], conn->features[0][1], 52 conn->features[0][2], conn->features[0][3], 53 conn->features[0][4], conn->features[0][5], 54 conn->features[0][6], conn->features[0][7]); 55} 56 57#define LINK_ATTR(_name, _mode, _show, _store) \ 58struct device_attribute link_attr_##_name = __ATTR(_name, _mode, _show, _store) 59 60static LINK_ATTR(type, S_IRUGO, show_link_type, NULL); 61static LINK_ATTR(address, S_IRUGO, show_link_address, NULL); 62static LINK_ATTR(features, S_IRUGO, show_link_features, NULL); 63 64static struct attribute *bt_link_attrs[] = { 65 &link_attr_type.attr, 66 &link_attr_address.attr, 67 &link_attr_features.attr, 68 NULL 69}; 70 71static struct attribute_group bt_link_group = { 72 .attrs = bt_link_attrs, 73}; 74 75static const struct attribute_group *bt_link_groups[] = { 76 &bt_link_group, 77 NULL 78}; 79 80static void bt_link_release(struct device *dev) 81{ 82 struct hci_conn *conn = to_hci_conn(dev); 83 kfree(conn); 84} 85 86static struct device_type bt_link = { 87 .name = "link", 88 .groups = bt_link_groups, 89 .release = bt_link_release, 90}; 91 92/* 93 * The rfcomm tty device will possibly retain even when conn 94 * is down, and sysfs doesn't support move zombie device, 95 * so we should move the device before conn device is destroyed. 96 */ 97static int __match_tty(struct device *dev, void *data) 98{ 99 return !strncmp(dev_name(dev), "rfcomm", 6); 100} 101 102void hci_conn_init_sysfs(struct hci_conn *conn) 103{ 104 struct hci_dev *hdev = conn->hdev; 105 106 BT_DBG("conn %p", conn); 107 108 conn->dev.type = &bt_link; 109 conn->dev.class = bt_class; 110 conn->dev.parent = &hdev->dev; 111 112 device_initialize(&conn->dev); 113} 114 115void hci_conn_add_sysfs(struct hci_conn *conn) 116{ 117 struct hci_dev *hdev = conn->hdev; 118 119 BT_DBG("conn %p", conn); 120 121 dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle); 122 123 if (device_add(&conn->dev) < 0) { 124 BT_ERR("Failed to register connection device"); 125 return; 126 } 127 128 hci_dev_hold(hdev); 129} 130 131void hci_conn_del_sysfs(struct hci_conn *conn) 132{ 133 struct hci_dev *hdev = conn->hdev; 134 135 if (!device_is_registered(&conn->dev)) 136 return; 137 138 while (1) { 139 struct device *dev; 140 141 dev = device_find_child(&conn->dev, NULL, __match_tty); 142 if (!dev) 143 break; 144 device_move(dev, NULL, DPM_ORDER_DEV_LAST); 145 put_device(dev); 146 } 147 148 device_del(&conn->dev); 149 150 hci_dev_put(hdev); 151} 152 153static inline char *host_bustostr(int bus) 154{ 155 switch (bus) { 156 case HCI_VIRTUAL: 157 return "VIRTUAL"; 158 case HCI_USB: 159 return "USB"; 160 case HCI_PCCARD: 161 return "PCCARD"; 162 case HCI_UART: 163 return "UART"; 164 case HCI_RS232: 165 return "RS232"; 166 case HCI_PCI: 167 return "PCI"; 168 case HCI_SDIO: 169 return "SDIO"; 170 default: 171 return "UNKNOWN"; 172 } 173} 174 175static inline char *host_typetostr(int type) 176{ 177 switch (type) { 178 case HCI_BREDR: 179 return "BR/EDR"; 180 case HCI_AMP: 181 return "AMP"; 182 default: 183 return "UNKNOWN"; 184 } 185} 186 187static ssize_t show_bus(struct device *dev, 188 struct device_attribute *attr, char *buf) 189{ 190 struct hci_dev *hdev = to_hci_dev(dev); 191 return sprintf(buf, "%s\n", host_bustostr(hdev->bus)); 192} 193 194static ssize_t show_type(struct device *dev, 195 struct device_attribute *attr, char *buf) 196{ 197 struct hci_dev *hdev = to_hci_dev(dev); 198 return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type)); 199} 200 201static ssize_t show_name(struct device *dev, 202 struct device_attribute *attr, char *buf) 203{ 204 struct hci_dev *hdev = to_hci_dev(dev); 205 char name[HCI_MAX_NAME_LENGTH + 1]; 206 int i; 207 208 for (i = 0; i < HCI_MAX_NAME_LENGTH; i++) 209 name[i] = hdev->dev_name[i]; 210 211 name[HCI_MAX_NAME_LENGTH] = '\0'; 212 return sprintf(buf, "%s\n", name); 213} 214 215static ssize_t show_class(struct device *dev, 216 struct device_attribute *attr, char *buf) 217{ 218 struct hci_dev *hdev = to_hci_dev(dev); 219 return sprintf(buf, "0x%.2x%.2x%.2x\n", hdev->dev_class[2], 220 hdev->dev_class[1], hdev->dev_class[0]); 221} 222 223static ssize_t show_address(struct device *dev, 224 struct device_attribute *attr, char *buf) 225{ 226 struct hci_dev *hdev = to_hci_dev(dev); 227 return sprintf(buf, "%pMR\n", &hdev->bdaddr); 228} 229 230static ssize_t show_features(struct device *dev, 231 struct device_attribute *attr, char *buf) 232{ 233 struct hci_dev *hdev = to_hci_dev(dev); 234 235 return sprintf(buf, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n", 236 hdev->features[0][0], hdev->features[0][1], 237 hdev->features[0][2], hdev->features[0][3], 238 hdev->features[0][4], hdev->features[0][5], 239 hdev->features[0][6], hdev->features[0][7]); 240} 241 242static ssize_t show_manufacturer(struct device *dev, 243 struct device_attribute *attr, char *buf) 244{ 245 struct hci_dev *hdev = to_hci_dev(dev); 246 return sprintf(buf, "%d\n", hdev->manufacturer); 247} 248 249static ssize_t show_hci_version(struct device *dev, 250 struct device_attribute *attr, char *buf) 251{ 252 struct hci_dev *hdev = to_hci_dev(dev); 253 return sprintf(buf, "%d\n", hdev->hci_ver); 254} 255 256static ssize_t show_hci_revision(struct device *dev, 257 struct device_attribute *attr, char *buf) 258{ 259 struct hci_dev *hdev = to_hci_dev(dev); 260 return sprintf(buf, "%d\n", hdev->hci_rev); 261} 262 263static ssize_t show_idle_timeout(struct device *dev, 264 struct device_attribute *attr, char *buf) 265{ 266 struct hci_dev *hdev = to_hci_dev(dev); 267 return sprintf(buf, "%d\n", hdev->idle_timeout); 268} 269 270static ssize_t store_idle_timeout(struct device *dev, 271 struct device_attribute *attr, 272 const char *buf, size_t count) 273{ 274 struct hci_dev *hdev = to_hci_dev(dev); 275 unsigned int val; 276 int rv; 277 278 rv = kstrtouint(buf, 0, &val); 279 if (rv < 0) 280 return rv; 281 282 if (val != 0 && (val < 500 || val > 3600000)) 283 return -EINVAL; 284 285 hdev->idle_timeout = val; 286 287 return count; 288} 289 290static ssize_t show_sniff_max_interval(struct device *dev, 291 struct device_attribute *attr, char *buf) 292{ 293 struct hci_dev *hdev = to_hci_dev(dev); 294 return sprintf(buf, "%d\n", hdev->sniff_max_interval); 295} 296 297static ssize_t store_sniff_max_interval(struct device *dev, 298 struct device_attribute *attr, 299 const char *buf, size_t count) 300{ 301 struct hci_dev *hdev = to_hci_dev(dev); 302 u16 val; 303 int rv; 304 305 rv = kstrtou16(buf, 0, &val); 306 if (rv < 0) 307 return rv; 308 309 if (val == 0 || val % 2 || val < hdev->sniff_min_interval) 310 return -EINVAL; 311 312 hdev->sniff_max_interval = val; 313 314 return count; 315} 316 317static ssize_t show_sniff_min_interval(struct device *dev, 318 struct device_attribute *attr, char *buf) 319{ 320 struct hci_dev *hdev = to_hci_dev(dev); 321 return sprintf(buf, "%d\n", hdev->sniff_min_interval); 322} 323 324static ssize_t store_sniff_min_interval(struct device *dev, 325 struct device_attribute *attr, 326 const char *buf, size_t count) 327{ 328 struct hci_dev *hdev = to_hci_dev(dev); 329 u16 val; 330 int rv; 331 332 rv = kstrtou16(buf, 0, &val); 333 if (rv < 0) 334 return rv; 335 336 if (val == 0 || val % 2 || val > hdev->sniff_max_interval) 337 return -EINVAL; 338 339 hdev->sniff_min_interval = val; 340 341 return count; 342} 343 344static DEVICE_ATTR(bus, S_IRUGO, show_bus, NULL); 345static DEVICE_ATTR(type, S_IRUGO, show_type, NULL); 346static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 347static DEVICE_ATTR(class, S_IRUGO, show_class, NULL); 348static DEVICE_ATTR(address, S_IRUGO, show_address, NULL); 349static DEVICE_ATTR(features, S_IRUGO, show_features, NULL); 350static DEVICE_ATTR(manufacturer, S_IRUGO, show_manufacturer, NULL); 351static DEVICE_ATTR(hci_version, S_IRUGO, show_hci_version, NULL); 352static DEVICE_ATTR(hci_revision, S_IRUGO, show_hci_revision, NULL); 353 354static DEVICE_ATTR(idle_timeout, S_IRUGO | S_IWUSR, 355 show_idle_timeout, store_idle_timeout); 356static DEVICE_ATTR(sniff_max_interval, S_IRUGO | S_IWUSR, 357 show_sniff_max_interval, store_sniff_max_interval); 358static DEVICE_ATTR(sniff_min_interval, S_IRUGO | S_IWUSR, 359 show_sniff_min_interval, store_sniff_min_interval); 360 361static struct attribute *bt_host_attrs[] = { 362 &dev_attr_bus.attr, 363 &dev_attr_type.attr, 364 &dev_attr_name.attr, 365 &dev_attr_class.attr, 366 &dev_attr_address.attr, 367 &dev_attr_features.attr, 368 &dev_attr_manufacturer.attr, 369 &dev_attr_hci_version.attr, 370 &dev_attr_hci_revision.attr, 371 &dev_attr_idle_timeout.attr, 372 &dev_attr_sniff_max_interval.attr, 373 &dev_attr_sniff_min_interval.attr, 374 NULL 375}; 376 377static struct attribute_group bt_host_group = { 378 .attrs = bt_host_attrs, 379}; 380 381static const struct attribute_group *bt_host_groups[] = { 382 &bt_host_group, 383 NULL 384}; 385 386static void bt_host_release(struct device *dev) 387{ 388 struct hci_dev *hdev = to_hci_dev(dev); 389 kfree(hdev); 390 module_put(THIS_MODULE); 391} 392 393static struct device_type bt_host = { 394 .name = "host", 395 .groups = bt_host_groups, 396 .release = bt_host_release, 397}; 398 399static int blacklist_show(struct seq_file *f, void *p) 400{ 401 struct hci_dev *hdev = f->private; 402 struct bdaddr_list *b; 403 404 hci_dev_lock(hdev); 405 406 list_for_each_entry(b, &hdev->blacklist, list) 407 seq_printf(f, "%pMR\n", &b->bdaddr); 408 409 hci_dev_unlock(hdev); 410 411 return 0; 412} 413 414static int blacklist_open(struct inode *inode, struct file *file) 415{ 416 return single_open(file, blacklist_show, inode->i_private); 417} 418 419static const struct file_operations blacklist_fops = { 420 .open = blacklist_open, 421 .read = seq_read, 422 .llseek = seq_lseek, 423 .release = single_release, 424}; 425 426static void print_bt_uuid(struct seq_file *f, u8 *uuid) 427{ 428 u32 data0, data5; 429 u16 data1, data2, data3, data4; 430 431 data5 = get_unaligned_le32(uuid); 432 data4 = get_unaligned_le16(uuid + 4); 433 data3 = get_unaligned_le16(uuid + 6); 434 data2 = get_unaligned_le16(uuid + 8); 435 data1 = get_unaligned_le16(uuid + 10); 436 data0 = get_unaligned_le32(uuid + 12); 437 438 seq_printf(f, "%.8x-%.4x-%.4x-%.4x-%.4x%.8x\n", 439 data0, data1, data2, data3, data4, data5); 440} 441 442static int uuids_show(struct seq_file *f, void *p) 443{ 444 struct hci_dev *hdev = f->private; 445 struct bt_uuid *uuid; 446 447 hci_dev_lock(hdev); 448 449 list_for_each_entry(uuid, &hdev->uuids, list) 450 print_bt_uuid(f, uuid->uuid); 451 452 hci_dev_unlock(hdev); 453 454 return 0; 455} 456 457static int uuids_open(struct inode *inode, struct file *file) 458{ 459 return single_open(file, uuids_show, inode->i_private); 460} 461 462static const struct file_operations uuids_fops = { 463 .open = uuids_open, 464 .read = seq_read, 465 .llseek = seq_lseek, 466 .release = single_release, 467}; 468 469void hci_init_sysfs(struct hci_dev *hdev) 470{ 471 struct device *dev = &hdev->dev; 472 473 dev->type = &bt_host; 474 dev->class = bt_class; 475 476 __module_get(THIS_MODULE); 477 device_initialize(dev); 478} 479 480int hci_add_sysfs(struct hci_dev *hdev) 481{ 482 struct device *dev = &hdev->dev; 483 int err; 484 485 BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus); 486 487 dev_set_name(dev, "%s", hdev->name); 488 489 err = device_add(dev); 490 if (err < 0) 491 return err; 492 493 if (!bt_debugfs) 494 return 0; 495 496 hdev->debugfs = debugfs_create_dir(hdev->name, bt_debugfs); 497 if (!hdev->debugfs) 498 return 0; 499 500 debugfs_create_file("blacklist", 0444, hdev->debugfs, 501 hdev, &blacklist_fops); 502 503 debugfs_create_file("uuids", 0444, hdev->debugfs, hdev, &uuids_fops); 504 505 return 0; 506} 507 508void hci_del_sysfs(struct hci_dev *hdev) 509{ 510 BT_DBG("%p name %s bus %d", hdev, hdev->name, hdev->bus); 511 512 debugfs_remove_recursive(hdev->debugfs); 513 514 device_del(&hdev->dev); 515} 516 517int __init bt_sysfs_init(void) 518{ 519 bt_debugfs = debugfs_create_dir("bluetooth", NULL); 520 521 bt_class = class_create(THIS_MODULE, "bluetooth"); 522 523 return PTR_ERR_OR_ZERO(bt_class); 524} 525 526void bt_sysfs_cleanup(void) 527{ 528 class_destroy(bt_class); 529 530 debugfs_remove_recursive(bt_debugfs); 531} 532