usb_linux.c revision 13f797da7f190e9ea52f2f3d235210b8a4963b21
1/* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include <stdio.h> 18#include <stdlib.h> 19#include <unistd.h> 20#include <string.h> 21 22#include <sys/ioctl.h> 23#include <sys/types.h> 24#include <dirent.h> 25#include <fcntl.h> 26#include <errno.h> 27#include <ctype.h> 28 29#include <linux/usbdevice_fs.h> 30#include <linux/version.h> 31#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 20) 32#include <linux/usb/ch9.h> 33#else 34#include <linux/usb_ch9.h> 35#endif 36#include <asm/byteorder.h> 37 38#include "sysdeps.h" 39 40#define TRACE_TAG TRACE_USB 41#include "adb.h" 42 43 44/* usb scan debugging is waaaay too verbose */ 45#define DBGX(x...) 46 47static adb_mutex_t usb_lock = ADB_MUTEX_INITIALIZER; 48 49struct usb_handle 50{ 51 usb_handle *prev; 52 usb_handle *next; 53 54 char fname[64]; 55 int desc; 56 unsigned char ep_in; 57 unsigned char ep_out; 58 59 unsigned zero_mask; 60 61 struct usbdevfs_urb urb_in; 62 struct usbdevfs_urb urb_out; 63 64 int urb_in_busy; 65 int urb_out_busy; 66 int dead; 67 68 adb_cond_t notify; 69 adb_mutex_t lock; 70 71 // for garbage collecting disconnected devices 72 int mark; 73 74 // ID of thread currently in REAPURB 75 pthread_t reaper_thread; 76}; 77 78static usb_handle handle_list = { 79 .prev = &handle_list, 80 .next = &handle_list, 81}; 82 83static int known_device(const char *dev_name) 84{ 85 usb_handle *usb; 86 87 adb_mutex_lock(&usb_lock); 88 for(usb = handle_list.next; usb != &handle_list; usb = usb->next){ 89 if(!strcmp(usb->fname, dev_name)) { 90 // set mark flag to indicate this device is still alive 91 usb->mark = 1; 92 adb_mutex_unlock(&usb_lock); 93 return 1; 94 } 95 } 96 adb_mutex_unlock(&usb_lock); 97 return 0; 98} 99 100static void kick_disconnected_devices() 101{ 102 usb_handle *usb; 103 104 adb_mutex_lock(&usb_lock); 105 // kick any devices in the device list that were not found in the device scan 106 for(usb = handle_list.next; usb != &handle_list; usb = usb->next){ 107 if (usb->mark == 0) { 108 usb_kick(usb); 109 } else { 110 usb->mark = 0; 111 } 112 } 113 adb_mutex_unlock(&usb_lock); 114 115} 116 117static void register_device(const char *dev_name, unsigned char ep_in, unsigned char ep_out, 118 int ifc, const char *serial, unsigned zero_mask); 119 120static inline int badname(const char *name) 121{ 122 while(*name) { 123 if(!isdigit(*name++)) return 1; 124 } 125 return 0; 126} 127 128static int find_usb_device(const char *base, 129 void (*register_device_callback) (const char *, unsigned char, unsigned char, int, const char *, unsigned)) 130{ 131 char busname[32], devname[32]; 132 unsigned char local_ep_in, local_ep_out; 133 DIR *busdir , *devdir ; 134 struct dirent *de; 135 int fd ; 136 int found_device = 0; 137 char serial[256]; 138 139 busdir = opendir(base); 140 if(busdir == 0) return 0; 141 142 while((de = readdir(busdir)) != 0) { 143 if(badname(de->d_name)) continue; 144 145 snprintf(busname, sizeof busname, "%s/%s", base, de->d_name); 146 devdir = opendir(busname); 147 if(devdir == 0) continue; 148 149// DBGX("[ scanning %s ]\n", busname); 150 while((de = readdir(devdir))) { 151 unsigned char devdesc[256]; 152 unsigned char* bufptr = devdesc; 153 struct usb_device_descriptor* device; 154 struct usb_config_descriptor* config; 155 struct usb_interface_descriptor* interface; 156 struct usb_endpoint_descriptor *ep1, *ep2; 157 unsigned zero_mask = 0; 158 unsigned vid, pid; 159 int i, interfaces; 160 size_t desclength; 161 162 if(badname(de->d_name)) continue; 163 snprintf(devname, sizeof devname, "%s/%s", busname, de->d_name); 164 165 if(known_device(devname)) { 166 DBGX("skipping %s\n", devname); 167 continue; 168 } 169 170// DBGX("[ scanning %s ]\n", devname); 171 if((fd = unix_open(devname, O_RDWR)) < 0) { 172 continue; 173 } 174 175 desclength = adb_read(fd, devdesc, sizeof(devdesc)); 176 177 // should have device and configuration descriptors, and atleast two endpoints 178 if (desclength < USB_DT_DEVICE_SIZE + USB_DT_CONFIG_SIZE) { 179 D("desclength %d is too small\n", desclength); 180 adb_close(fd); 181 continue; 182 } 183 184 device = (struct usb_device_descriptor*)bufptr; 185 bufptr += USB_DT_DEVICE_SIZE; 186 187 if((device->bLength != USB_DT_DEVICE_SIZE) || (device->bDescriptorType != USB_DT_DEVICE)) { 188 adb_close(fd); 189 continue; 190 } 191 192 vid = __le16_to_cpu(device->idVendor); 193 pid = __le16_to_cpu(device->idProduct); 194 pid = devdesc[10] | (devdesc[11] << 8); 195 DBGX("[ %s is V:%04x P:%04x ]\n", devname, vid, pid); 196 197 // should have config descriptor next 198 config = (struct usb_config_descriptor *)bufptr; 199 bufptr += USB_DT_CONFIG_SIZE; 200 if (config->bLength != USB_DT_CONFIG_SIZE || config->bDescriptorType != USB_DT_CONFIG) { 201 D("usb_config_descriptor not found\n"); 202 adb_close(fd); 203 continue; 204 } 205 206 // loop through all the interfaces and look for the ADB interface 207 interfaces = config->bNumInterfaces; 208 for (i = 0; i < interfaces; i++) { 209 if (bufptr + USB_DT_ENDPOINT_SIZE > devdesc + desclength) 210 break; 211 212 interface = (struct usb_interface_descriptor *)bufptr; 213 bufptr += USB_DT_INTERFACE_SIZE; 214 if (interface->bLength != USB_DT_INTERFACE_SIZE || 215 interface->bDescriptorType != USB_DT_INTERFACE) { 216 D("usb_interface_descriptor not found\n"); 217 break; 218 } 219 220 DBGX("bInterfaceClass: %d, bInterfaceSubClass: %d," 221 "bInterfaceProtocol: %d, bNumEndpoints: %d\n", 222 interface->bInterfaceClass, interface->bInterfaceSubClass, 223 interface->bInterfaceProtocol, interface->bNumEndpoints); 224 225 if (interface->bNumEndpoints == 2 && 226 is_adb_interface(vid, pid, interface->bInterfaceClass, 227 interface->bInterfaceSubClass, interface->bInterfaceProtocol)) { 228 229 DBGX("looking for bulk endpoints\n"); 230 // looks like ADB... 231 ep1 = (struct usb_endpoint_descriptor *)bufptr; 232 bufptr += USB_DT_ENDPOINT_SIZE; 233 ep2 = (struct usb_endpoint_descriptor *)bufptr; 234 bufptr += USB_DT_ENDPOINT_SIZE; 235 236 if (bufptr > devdesc + desclength || 237 ep1->bLength != USB_DT_ENDPOINT_SIZE || 238 ep1->bDescriptorType != USB_DT_ENDPOINT || 239 ep2->bLength != USB_DT_ENDPOINT_SIZE || 240 ep2->bDescriptorType != USB_DT_ENDPOINT) { 241 D("endpoints not found\n"); 242 break; 243 } 244 245 // both endpoints should be bulk 246 if (ep1->bmAttributes != USB_ENDPOINT_XFER_BULK || 247 ep2->bmAttributes != USB_ENDPOINT_XFER_BULK) { 248 D("bulk endpoints not found\n"); 249 continue; 250 } 251 252 /* aproto 01 needs 0 termination */ 253 if(interface->bInterfaceProtocol == 0x01) { 254 zero_mask = ep1->wMaxPacketSize - 1; 255 } 256 257 // we have a match. now we just need to figure out which is in and which is out. 258 if (ep1->bEndpointAddress & USB_ENDPOINT_DIR_MASK) { 259 local_ep_in = ep1->bEndpointAddress; 260 local_ep_out = ep2->bEndpointAddress; 261 } else { 262 local_ep_in = ep2->bEndpointAddress; 263 local_ep_out = ep1->bEndpointAddress; 264 } 265 266 // read the device's serial number 267 serial[0] = 0; 268 memset(serial, 0, sizeof(serial)); 269 if (device->iSerialNumber) { 270 struct usbdevfs_ctrltransfer ctrl; 271 __u16 buffer[128]; 272 int result; 273 274 memset(buffer, 0, sizeof(buffer)); 275 memset(&ctrl, 0, sizeof(ctrl)); 276 277 ctrl.bRequestType = USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE; 278 ctrl.bRequest = USB_REQ_GET_DESCRIPTOR; 279 ctrl.wValue = (USB_DT_STRING << 8) | device->iSerialNumber; 280 ctrl.wIndex = 0; 281 ctrl.wLength = sizeof(buffer); 282 ctrl.data = buffer; 283 284 result = ioctl(fd, USBDEVFS_CONTROL, &ctrl); 285 if (result > 0) { 286 int i; 287 // skip first word, and copy the rest to the serial string, changing shorts to bytes. 288 result /= 2; 289 for (i = 1; i < result; i++) 290 serial[i - 1] = buffer[i]; 291 serial[i - 1] = 0; 292 } 293 } 294 295 register_device_callback(devname, local_ep_in, local_ep_out, 296 interface->bInterfaceNumber, serial, zero_mask); 297 298 found_device = 1; 299 break; 300 } else { 301 // skip to next interface 302 bufptr += (interface->bNumEndpoints * USB_DT_ENDPOINT_SIZE); 303 } 304 } // end of for 305 306 adb_close(fd); 307 } // end of devdir while 308 closedir(devdir); 309 } //end of busdir while 310 closedir(busdir); 311 312 return found_device; 313} 314 315void usb_cleanup() 316{ 317} 318 319static int usb_bulk_write(usb_handle *h, const void *data, int len) 320{ 321 struct usbdevfs_urb *urb = &h->urb_out; 322 int res; 323 324 memset(urb, 0, sizeof(*urb)); 325 urb->type = USBDEVFS_URB_TYPE_BULK; 326 urb->endpoint = h->ep_out; 327 urb->status = -1; 328 urb->buffer = (void*) data; 329 urb->buffer_length = len; 330 331 D("++ write ++\n"); 332 333 adb_mutex_lock(&h->lock); 334 if(h->dead) { 335 res = -1; 336 goto fail; 337 } 338 do { 339 res = ioctl(h->desc, USBDEVFS_SUBMITURB, urb); 340 } while((res < 0) && (errno == EINTR)); 341 342 if(res < 0) { 343 goto fail; 344 } 345 346 res = -1; 347 h->urb_out_busy = 1; 348 for(;;) { 349 adb_cond_wait(&h->notify, &h->lock); 350 if(h->dead) { 351 break; 352 } 353 if(h->urb_out_busy == 0) { 354 if(urb->status == 0) { 355 res = urb->actual_length; 356 } 357 break; 358 } 359 } 360fail: 361 adb_mutex_unlock(&h->lock); 362 D("-- write --\n"); 363 return res; 364} 365 366static int usb_bulk_read(usb_handle *h, void *data, int len) 367{ 368 struct usbdevfs_urb *urb = &h->urb_in; 369 struct usbdevfs_urb *out = NULL; 370 int res; 371 372 memset(urb, 0, sizeof(*urb)); 373 urb->type = USBDEVFS_URB_TYPE_BULK; 374 urb->endpoint = h->ep_in; 375 urb->status = -1; 376 urb->buffer = data; 377 urb->buffer_length = len; 378 379 380 adb_mutex_lock(&h->lock); 381 if(h->dead) { 382 res = -1; 383 goto fail; 384 } 385 do { 386 res = ioctl(h->desc, USBDEVFS_SUBMITURB, urb); 387 } while((res < 0) && (errno == EINTR)); 388 389 if(res < 0) { 390 goto fail; 391 } 392 393 h->urb_in_busy = 1; 394 for(;;) { 395 D("[ reap urb - wait ]\n"); 396 h->reaper_thread = pthread_self(); 397 adb_mutex_unlock(&h->lock); 398 res = ioctl(h->desc, USBDEVFS_REAPURB, &out); 399 adb_mutex_lock(&h->lock); 400 h->reaper_thread = 0; 401 if(h->dead) { 402 res = -1; 403 break; 404 } 405 if(res < 0) { 406 if(errno == EINTR) { 407 continue; 408 } 409 D("[ reap urb - error ]\n"); 410 break; 411 } 412 D("[ urb @%p status = %d, actual = %d ]\n", 413 out, out->status, out->actual_length); 414 415 if(out == &h->urb_in) { 416 D("[ reap urb - IN complete ]\n"); 417 h->urb_in_busy = 0; 418 if(urb->status == 0) { 419 res = urb->actual_length; 420 } else { 421 res = -1; 422 } 423 break; 424 } 425 if(out == &h->urb_out) { 426 D("[ reap urb - OUT compelete ]\n"); 427 h->urb_out_busy = 0; 428 adb_cond_broadcast(&h->notify); 429 } 430 } 431fail: 432 adb_mutex_unlock(&h->lock); 433 return res; 434} 435 436 437int usb_write(usb_handle *h, const void *_data, int len) 438{ 439 unsigned char *data = (unsigned char*) _data; 440 int n; 441 int need_zero = 0; 442 443 if(h->zero_mask) { 444 /* if we need 0-markers and our transfer 445 ** is an even multiple of the packet size, 446 ** we make note of it 447 */ 448 if(!(len & h->zero_mask)) { 449 need_zero = 1; 450 } 451 } 452 453 while(len > 0) { 454 int xfer = (len > 4096) ? 4096 : len; 455 456 n = usb_bulk_write(h, data, xfer); 457 if(n != xfer) { 458 D("ERROR: n = %d, errno = %d (%s)\n", 459 n, errno, strerror(errno)); 460 return -1; 461 } 462 463 len -= xfer; 464 data += xfer; 465 } 466 467 if(need_zero){ 468 n = usb_bulk_write(h, _data, 0); 469 return n; 470 } 471 472 return 0; 473} 474 475int usb_read(usb_handle *h, void *_data, int len) 476{ 477 unsigned char *data = (unsigned char*) _data; 478 int n; 479 480 D("++ usb_read ++\n"); 481 while(len > 0) { 482 int xfer = (len > 4096) ? 4096 : len; 483 484 D("[ usb read %d fd = %d], fname=%s\n", xfer, h->desc, h->fname); 485 n = usb_bulk_read(h, data, xfer); 486 D("[ usb read %d ] = %d, fname=%s\n", xfer, n, h->fname); 487 if(n != xfer) { 488 if((errno == ETIMEDOUT) && (h->desc != -1)) { 489 D("[ timeout ]\n"); 490 if(n > 0){ 491 data += n; 492 len -= n; 493 } 494 continue; 495 } 496 D("ERROR: n = %d, errno = %d (%s)\n", 497 n, errno, strerror(errno)); 498 return -1; 499 } 500 501 len -= xfer; 502 data += xfer; 503 } 504 505 D("-- usb_read --\n"); 506 return 0; 507} 508 509void usb_kick(usb_handle *h) 510{ 511 D("[ kicking %p (fd = %d) ]\n", h, h->desc); 512 adb_mutex_lock(&h->lock); 513 if(h->dead == 0) { 514 h->dead = 1; 515 516 /* HACK ALERT! 517 ** Sometimes we get stuck in ioctl(USBDEVFS_REAPURB). 518 ** This is a workaround for that problem. 519 */ 520 if (h->reaper_thread) { 521 pthread_kill(h->reaper_thread, SIGALRM); 522 } 523 524 /* cancel any pending transactions 525 ** these will quietly fail if the txns are not active, 526 ** but this ensures that a reader blocked on REAPURB 527 ** will get unblocked 528 */ 529 ioctl(h->desc, USBDEVFS_DISCARDURB, &h->urb_in); 530 ioctl(h->desc, USBDEVFS_DISCARDURB, &h->urb_out); 531 h->urb_in.status = -ENODEV; 532 h->urb_out.status = -ENODEV; 533 h->urb_in_busy = 0; 534 h->urb_out_busy = 0; 535 adb_cond_broadcast(&h->notify); 536 } 537 adb_mutex_unlock(&h->lock); 538} 539 540int usb_close(usb_handle *h) 541{ 542 D("[ usb close ... ]\n"); 543 adb_mutex_lock(&usb_lock); 544 h->next->prev = h->prev; 545 h->prev->next = h->next; 546 h->prev = 0; 547 h->next = 0; 548 549 adb_close(h->desc); 550 D("[ usb closed %p (fd = %d) ]\n", h, h->desc); 551 adb_mutex_unlock(&usb_lock); 552 553 free(h); 554 return 0; 555} 556 557static void register_device(const char *dev_name, 558 unsigned char ep_in, unsigned char ep_out, 559 int interface, 560 const char *serial, unsigned zero_mask) 561{ 562 usb_handle* usb = 0; 563 int n = 0; 564 565 /* Since Linux will not reassign the device ID (and dev_name) 566 ** as long as the device is open, we can add to the list here 567 ** once we open it and remove from the list when we're finally 568 ** closed and everything will work out fine. 569 ** 570 ** If we have a usb_handle on the list 'o handles with a matching 571 ** name, we have no further work to do. 572 */ 573 adb_mutex_lock(&usb_lock); 574 for(usb = handle_list.next; usb != &handle_list; usb = usb->next){ 575 if(!strcmp(usb->fname, dev_name)) { 576 adb_mutex_unlock(&usb_lock); 577 return; 578 } 579 } 580 adb_mutex_unlock(&usb_lock); 581 582 D("[ usb located new device %s (%d/%d/%d) ]\n", 583 dev_name, ep_in, ep_out, interface); 584 usb = calloc(1, sizeof(usb_handle)); 585 strcpy(usb->fname, dev_name); 586 usb->ep_in = ep_in; 587 usb->ep_out = ep_out; 588 usb->zero_mask = zero_mask; 589 590 adb_cond_init(&usb->notify, 0); 591 adb_mutex_init(&usb->lock, 0); 592 /* initialize mark to 1 so we don't get garbage collected after the device scan */ 593 usb->mark = 1; 594 usb->reaper_thread = 0; 595 596 usb->desc = unix_open(usb->fname, O_RDWR); 597 if(usb->desc < 0) goto fail; 598 D("[ usb open %s fd = %d]\n", usb->fname, usb->desc); 599 n = ioctl(usb->desc, USBDEVFS_CLAIMINTERFACE, &interface); 600 if(n != 0) goto fail; 601 602 /* add to the end of the active handles */ 603 adb_mutex_lock(&usb_lock); 604 usb->next = &handle_list; 605 usb->prev = handle_list.prev; 606 usb->prev->next = usb; 607 usb->next->prev = usb; 608 adb_mutex_unlock(&usb_lock); 609 610 register_usb_transport(usb, serial); 611 return; 612 613fail: 614 D("[ usb open %s error=%d, err_str = %s]\n", 615 usb->fname, errno, strerror(errno)); 616 if(usb->desc >= 0) { 617 adb_close(usb->desc); 618 } 619 free(usb); 620} 621 622void* device_poll_thread(void* unused) 623{ 624 D("Created device thread\n"); 625 for(;;) { 626 /* XXX use inotify */ 627 find_usb_device("/dev/bus/usb", register_device); 628 kick_disconnected_devices(); 629 sleep(1); 630 } 631 return NULL; 632} 633 634static void sigalrm_handler(int signo) 635{ 636 // don't need to do anything here 637} 638 639void usb_init() 640{ 641 adb_thread_t tid; 642 struct sigaction actions; 643 644 memset(&actions, 0, sizeof(actions)); 645 sigemptyset(&actions.sa_mask); 646 actions.sa_flags = 0; 647 actions.sa_handler = sigalrm_handler; 648 sigaction(SIGALRM,& actions, NULL); 649 650 if(adb_thread_create(&tid, device_poll_thread, NULL)){ 651 fatal_errno("cannot create input thread"); 652 } 653} 654 655