1 /*
2 * Copyright (C) 2018 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 #define LOG_TAG "android.hardware.usb.gadget@1.1-service.bonito"
18
19 #include "UsbGadget.h"
20 #include <dirent.h>
21 #include <fcntl.h>
22 #include <stdio.h>
23 #include <sys/inotify.h>
24 #include <sys/mount.h>
25 #include <sys/stat.h>
26 #include <sys/types.h>
27 #include <unistd.h>
28
29 constexpr int BUFFER_SIZE = 512;
30 constexpr int MAX_FILE_PATH_LENGTH = 256;
31 constexpr int EPOLL_EVENTS = 10;
32 constexpr bool DEBUG = false;
33 constexpr int DISCONNECT_WAIT_US = 100000;
34 constexpr int PULL_UP_DELAY = 500000;
35
36 #define BUILD_TYPE "ro.build.type"
37 #define GADGET_PATH "/config/usb_gadget/g1/"
38 #define PULLUP_PATH GADGET_PATH "UDC"
39 #define GADGET_NAME "a600000.dwc3"
40 #define PERSISTENT_BOOT_MODE "ro.bootmode"
41 #define VENDOR_ID_PATH GADGET_PATH "idVendor"
42 #define PRODUCT_ID_PATH GADGET_PATH "idProduct"
43 #define DEVICE_CLASS_PATH GADGET_PATH "bDeviceClass"
44 #define DEVICE_SUB_CLASS_PATH GADGET_PATH "bDeviceSubClass"
45 #define DEVICE_PROTOCOL_PATH GADGET_PATH "bDeviceProtocol"
46 #define DESC_USE_PATH GADGET_PATH "os_desc/use"
47 #define OS_DESC_PATH GADGET_PATH "os_desc/b.1"
48 #define CONFIG_PATH GADGET_PATH "configs/b.1/"
49 #define FUNCTIONS_PATH GADGET_PATH "functions/"
50 #define FUNCTION_NAME "function"
51 #define FUNCTION_PATH CONFIG_PATH FUNCTION_NAME
52 #define RNDIS_PATH FUNCTIONS_PATH "gsi.rndis"
53
54 #define PERSISTENT_VENDOR_CONFIG "persist.vendor.usb.usbradio.config"
55 #define VENDOR_CONFIG "vendor.usb.config"
56
57 namespace android {
58 namespace hardware {
59 namespace usb {
60 namespace gadget {
61 namespace V1_1 {
62 namespace implementation {
63
64 volatile bool gadgetPullup;
65
66 // Used for debug.
displayInotifyEvent(struct inotify_event * i)67 static void displayInotifyEvent(struct inotify_event *i) {
68 ALOGE(" wd =%2d; ", i->wd);
69 if (i->cookie > 0) ALOGE("cookie =%4d; ", i->cookie);
70
71 ALOGE("mask = ");
72 if (i->mask & IN_ACCESS) ALOGE("IN_ACCESS ");
73 if (i->mask & IN_ATTRIB) ALOGE("IN_ATTRIB ");
74 if (i->mask & IN_CLOSE_NOWRITE) ALOGE("IN_CLOSE_NOWRITE ");
75 if (i->mask & IN_CLOSE_WRITE) ALOGE("IN_CLOSE_WRITE ");
76 if (i->mask & IN_CREATE) ALOGE("IN_CREATE ");
77 if (i->mask & IN_DELETE) ALOGE("IN_DELETE ");
78 if (i->mask & IN_DELETE_SELF) ALOGE("IN_DELETE_SELF ");
79 if (i->mask & IN_IGNORED) ALOGE("IN_IGNORED ");
80 if (i->mask & IN_ISDIR) ALOGE("IN_ISDIR ");
81 if (i->mask & IN_MODIFY) ALOGE("IN_MODIFY ");
82 if (i->mask & IN_MOVE_SELF) ALOGE("IN_MOVE_SELF ");
83 if (i->mask & IN_MOVED_FROM) ALOGE("IN_MOVED_FROM ");
84 if (i->mask & IN_MOVED_TO) ALOGE("IN_MOVED_TO ");
85 if (i->mask & IN_OPEN) ALOGE("IN_OPEN ");
86 if (i->mask & IN_Q_OVERFLOW) ALOGE("IN_Q_OVERFLOW ");
87 if (i->mask & IN_UNMOUNT) ALOGE("IN_UNMOUNT ");
88 ALOGE("\n");
89
90 if (i->len > 0) ALOGE(" name = %s\n", i->name);
91 }
92
monitorFfs(void * param)93 static void *monitorFfs(void *param) {
94 UsbGadget *usbGadget = (UsbGadget *)param;
95 char buf[BUFFER_SIZE];
96 bool writeUdc = true, stopMonitor = false;
97 struct epoll_event events[EPOLL_EVENTS];
98 steady_clock::time_point disconnect;
99
100 bool descriptorWritten = true;
101 for (int i = 0; i < static_cast<int>(usbGadget->mEndpointList.size()); i++) {
102 if (access(usbGadget->mEndpointList.at(i).c_str(), R_OK)) {
103 descriptorWritten = false;
104 break;
105 }
106 }
107
108 // notify here if the endpoints are already present.
109 if (descriptorWritten) {
110 usleep(PULL_UP_DELAY);
111 if (!!WriteStringToFile(GADGET_NAME, PULLUP_PATH)) {
112 lock_guard<mutex> lock(usbGadget->mLock);
113 usbGadget->mCurrentUsbFunctionsApplied = true;
114 gadgetPullup = true;
115 writeUdc = false;
116 ALOGI("GADGET pulled up");
117 usbGadget->mCv.notify_all();
118 }
119 }
120
121 while (!stopMonitor) {
122 int nrEvents = epoll_wait(usbGadget->mEpollFd, events, EPOLL_EVENTS, -1);
123
124 if (nrEvents <= 0) {
125 ALOGE("epoll wait did not return descriptor number");
126 continue;
127 }
128
129 for (int i = 0; i < nrEvents; i++) {
130 ALOGI("event=%u on fd=%d\n", events[i].events, events[i].data.fd);
131
132 if (events[i].data.fd == usbGadget->mInotifyFd) {
133 // Process all of the events in buffer returned by read().
134 int numRead = read(usbGadget->mInotifyFd, buf, BUFFER_SIZE);
135 for (char *p = buf; p < buf + numRead;) {
136 struct inotify_event *event = (struct inotify_event *)p;
137 if (DEBUG) displayInotifyEvent(event);
138
139 p += sizeof(struct inotify_event) + event->len;
140
141 bool descriptorPresent = true;
142 for (int j = 0; j < static_cast<int>(usbGadget->mEndpointList.size());
143 j++) {
144 if (access(usbGadget->mEndpointList.at(j).c_str(), R_OK)) {
145 if (DEBUG)
146 ALOGI("%s absent", usbGadget->mEndpointList.at(j).c_str());
147 descriptorPresent = false;
148 break;
149 }
150 }
151
152 if (!descriptorPresent && !writeUdc) {
153 if (DEBUG) ALOGI("endpoints not up");
154 writeUdc = true;
155 disconnect = std::chrono::steady_clock::now();
156 } else if (descriptorPresent && writeUdc) {
157 steady_clock::time_point temp = steady_clock::now();
158
159 if (std::chrono::duration_cast<microseconds>(temp - disconnect).count()
160 < PULL_UP_DELAY)
161 usleep(PULL_UP_DELAY);
162
163 if(!!WriteStringToFile(GADGET_NAME, PULLUP_PATH)) {
164 lock_guard<mutex> lock(usbGadget->mLock);
165 usbGadget->mCurrentUsbFunctionsApplied = true;
166 ALOGI("GADGET pulled up");
167 writeUdc = false;
168 gadgetPullup = true;
169 // notify the main thread to signal userspace.
170 usbGadget->mCv.notify_all();
171 }
172 }
173 }
174 } else {
175 uint64_t flag;
176 read(usbGadget->mEventFd, &flag, sizeof(flag));
177 if (flag == 100) {
178 stopMonitor = true;
179 break;
180 }
181 }
182 }
183 }
184 return NULL;
185 }
186
UsbGadget()187 UsbGadget::UsbGadget()
188 : mMonitorCreated(false), mCurrentUsbFunctionsApplied(false) {
189 if (access(OS_DESC_PATH, R_OK) != 0) ALOGE("configfs setup not done yet");
190 }
191
unlinkFunctions(const char * path)192 static int unlinkFunctions(const char *path) {
193 DIR *config = opendir(path);
194 struct dirent *function;
195 char filepath[MAX_FILE_PATH_LENGTH];
196 int ret = 0;
197
198 if (config == NULL) return -1;
199
200 // d_type does not seems to be supported in /config
201 // so filtering by name.
202 while (((function = readdir(config)) != NULL)) {
203 if ((strstr(function->d_name, FUNCTION_NAME) == NULL)) continue;
204 // build the path for each file in the folder.
205 sprintf(filepath, "%s/%s", path, function->d_name);
206 ret = remove(filepath);
207 if (ret) {
208 ALOGE("Unable remove file %s errno:%d", filepath, errno);
209 break;
210 }
211 }
212
213 closedir(config);
214 return ret;
215 }
216
addEpollFd(const unique_fd & epfd,const unique_fd & fd)217 static int addEpollFd(const unique_fd &epfd, const unique_fd &fd) {
218 struct epoll_event event;
219 int ret;
220
221 event.data.fd = fd;
222 event.events = EPOLLIN;
223
224 ret = epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &event);
225 if (ret) ALOGE("epoll_ctl error %d", errno);
226
227 return ret;
228 }
229
getCurrentUsbFunctions(const sp<V1_0::IUsbGadgetCallback> & callback)230 Return<void> UsbGadget::getCurrentUsbFunctions(
231 const sp<V1_0::IUsbGadgetCallback> &callback) {
232 Return<void> ret = callback->getCurrentUsbFunctionsCb(
233 mCurrentUsbFunctions, mCurrentUsbFunctionsApplied
234 ? Status::FUNCTIONS_APPLIED
235 : Status::FUNCTIONS_NOT_APPLIED);
236 if (!ret.isOk())
237 ALOGE("Call to getCurrentUsbFunctionsCb failed %s",
238 ret.description().c_str());
239
240 return Void();
241 }
242
tearDownGadget()243 V1_0::Status UsbGadget::tearDownGadget() {
244 ALOGI("setCurrentUsbFunctions None");
245
246 if (!WriteStringToFile("none", PULLUP_PATH))
247 ALOGI("Gadget cannot be pulled down");
248
249 if (!WriteStringToFile("0", DEVICE_CLASS_PATH)) return Status::ERROR;
250
251 if (!WriteStringToFile("0", DEVICE_SUB_CLASS_PATH)) return Status::ERROR;
252
253 if (!WriteStringToFile("0", DEVICE_PROTOCOL_PATH)) return Status::ERROR;
254
255 if (!WriteStringToFile("0", DESC_USE_PATH)) return Status::ERROR;
256
257 if (unlinkFunctions(CONFIG_PATH)) return Status::ERROR;
258
259 if (mMonitorCreated) {
260 uint64_t flag = 100;
261 unsigned long ret;
262
263 // Stop the monitor thread by writing into signal fd.
264 ret = TEMP_FAILURE_RETRY(write(mEventFd, &flag, sizeof(flag)));
265 if (ret < 0) {
266 ALOGE("Error writing errno=%d", errno);
267 } else if (ret < sizeof(flag)) {
268 ALOGE("Short write length=%zd", ret);
269 }
270
271 ALOGI("mMonitor signalled to exit");
272 mMonitor->join();
273 mMonitorCreated = false;
274 ALOGI("mMonitor destroyed");
275 } else {
276 ALOGI("mMonitor not running");
277 }
278
279 mInotifyFd.reset(-1);
280 mEventFd.reset(-1);
281 mEpollFd.reset(-1);
282 mEndpointList.clear();
283 return Status::SUCCESS;
284 }
285
reset()286 Return<Status> UsbGadget::reset() {
287 if (!WriteStringToFile("none", PULLUP_PATH)) {
288 ALOGI("Gadget cannot be pulled down");
289 return Status::ERROR;
290 }
291
292 return Status::SUCCESS;
293 }
294
linkFunction(const char * function,int index)295 static int linkFunction(const char *function, int index) {
296 char functionPath[MAX_FILE_PATH_LENGTH];
297 char link[MAX_FILE_PATH_LENGTH];
298
299 sprintf(functionPath, "%s%s", FUNCTIONS_PATH, function);
300 sprintf(link, "%s%d", FUNCTION_PATH, index);
301 if (symlink(functionPath, link)) {
302 ALOGE("Cannot create symlink %s -> %s errno:%d", link, functionPath, errno);
303 return -1;
304 }
305 return 0;
306 }
307
setVidPid(const char * vid,const char * pid)308 static V1_0::Status setVidPid(const char *vid, const char *pid) {
309 if (!WriteStringToFile(vid, VENDOR_ID_PATH)) return Status::ERROR;
310
311 if (!WriteStringToFile(pid, PRODUCT_ID_PATH)) return Status::ERROR;
312
313 return Status::SUCCESS;
314 }
315
getVendorFunctions()316 static std::string getVendorFunctions() {
317 if (GetProperty(BUILD_TYPE, "") == "user") return "user";
318
319 std::string bootMode = GetProperty(PERSISTENT_BOOT_MODE, "");
320 std::string persistVendorFunctions =
321 GetProperty(PERSISTENT_VENDOR_CONFIG, "");
322 std::string vendorFunctions = GetProperty(VENDOR_CONFIG, "");
323 std::string ret = "";
324
325 if (vendorFunctions != "") {
326 ret = vendorFunctions;
327 } else if (bootMode == "usbradio") {
328 if (persistVendorFunctions != "")
329 ret = persistVendorFunctions;
330 else
331 ret = "diag";
332 // vendor.usb.config will reflect the current configured functions
333 SetProperty(VENDOR_CONFIG, ret);
334 }
335
336 return ret;
337 }
338
validateAndSetVidPid(uint64_t functions)339 static V1_0::Status validateAndSetVidPid(uint64_t functions) {
340 V1_0::Status ret = Status::SUCCESS;
341 std::string vendorFunctions = getVendorFunctions();
342
343 switch (functions) {
344 case static_cast<uint64_t>(GadgetFunction::MTP):
345 if (vendorFunctions == "diag") {
346 ret = setVidPid("0x05C6", "0x901B");
347 } else {
348 if (!(vendorFunctions == "user" || vendorFunctions == ""))
349 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
350 ret = setVidPid("0x18d1", "0x4ee1");
351 }
352 break;
353 case GadgetFunction::ADB | GadgetFunction::MTP:
354 if (vendorFunctions == "diag") {
355 ret = setVidPid("0x05C6", "0x903A");
356 } else {
357 if (!(vendorFunctions == "user" || vendorFunctions == ""))
358 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
359 ret = setVidPid("0x18d1", "0x4ee2");
360 }
361 break;
362 case static_cast<uint64_t>(GadgetFunction::RNDIS):
363 if (vendorFunctions == "diag") {
364 ret = setVidPid("0x05C6", "0x902C");
365 } else if (vendorFunctions == "serial_cdev,diag") {
366 ret = setVidPid("0x05C6", "0x90B5");
367 } else {
368 if (!(vendorFunctions == "user" || vendorFunctions == ""))
369 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
370 ret = setVidPid("0x18d1", "0x4ee3");
371 }
372 break;
373 case GadgetFunction::ADB | GadgetFunction::RNDIS:
374 if (vendorFunctions == "diag") {
375 ret = setVidPid("0x05C6", "0x902D");
376 } else if (vendorFunctions == "serial_cdev,diag") {
377 ret = setVidPid("0x05C6", "0x90B6");
378 } else {
379 if (!(vendorFunctions == "user" || vendorFunctions == ""))
380 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
381 ret = setVidPid("0x18d1", "0x4ee4");
382 }
383 break;
384 case static_cast<uint64_t>(GadgetFunction::PTP):
385 if (!(vendorFunctions == "user" || vendorFunctions == ""))
386 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
387 ret = setVidPid("0x18d1", "0x4ee5");
388 break;
389 case GadgetFunction::ADB | GadgetFunction::PTP:
390 if (!(vendorFunctions == "user" || vendorFunctions == ""))
391 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
392 ret = setVidPid("0x18d1", "0x4ee6");
393 break;
394 case static_cast<uint64_t>(GadgetFunction::ADB):
395 if (vendorFunctions == "diag") {
396 ret = setVidPid("0x05C6", "0x901D");
397 } else if (vendorFunctions == "diag,serial_cdev,rmnet_gsi") {
398 ret = setVidPid("0x05C6", "0x9091");
399 } else if (vendorFunctions == "diag,serial_cdev") {
400 ret = setVidPid("0x05C6", "0x901F");
401 } else {
402 if (!(vendorFunctions == "user" || vendorFunctions == ""))
403 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
404 ret = setVidPid("0x18d1", "0x4ee7");
405 }
406 break;
407 case static_cast<uint64_t>(GadgetFunction::MIDI):
408 if (!(vendorFunctions == "user" || vendorFunctions == ""))
409 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
410 ret = setVidPid("0x18d1", "0x4ee8");
411 break;
412 case GadgetFunction::ADB | GadgetFunction::MIDI:
413 if (!(vendorFunctions == "user" || vendorFunctions == ""))
414 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
415 ret = setVidPid("0x18d1", "0x4ee9");
416 break;
417 case static_cast<uint64_t>(GadgetFunction::ACCESSORY):
418 if (!(vendorFunctions == "user" || vendorFunctions == ""))
419 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
420 ret = setVidPid("0x18d1", "0x2d00");
421 break;
422 case GadgetFunction::ADB | GadgetFunction::ACCESSORY:
423 if (!(vendorFunctions == "user" || vendorFunctions == ""))
424 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
425 ret = setVidPid("0x18d1", "0x2d01");
426 break;
427 case static_cast<uint64_t>(GadgetFunction::AUDIO_SOURCE):
428 if (!(vendorFunctions == "user" || vendorFunctions == ""))
429 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
430 ret = setVidPid("0x18d1", "0x2d02");
431 break;
432 case GadgetFunction::ADB | GadgetFunction::AUDIO_SOURCE:
433 if (!(vendorFunctions == "user" || vendorFunctions == ""))
434 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
435 ret = setVidPid("0x18d1", "0x2d03");
436 break;
437 case GadgetFunction::ACCESSORY | GadgetFunction::AUDIO_SOURCE:
438 if (!(vendorFunctions == "user" || vendorFunctions == ""))
439 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
440 ret = setVidPid("0x18d1", "0x2d04");
441 break;
442 case GadgetFunction::ADB | GadgetFunction::ACCESSORY |
443 GadgetFunction::AUDIO_SOURCE:
444 if (!(vendorFunctions == "user" || vendorFunctions == ""))
445 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
446 ret = setVidPid("0x18d1", "0x2d05");
447 break;
448 default:
449 ALOGE("Combination not supported");
450 ret = Status::CONFIGURATION_NOT_SUPPORTED;
451 }
452 return ret;
453 }
454
setupFunctions(uint64_t functions,const sp<V1_0::IUsbGadgetCallback> & callback,uint64_t timeout)455 V1_0::Status UsbGadget::setupFunctions(
456 uint64_t functions, const sp<V1_0::IUsbGadgetCallback> &callback,
457 uint64_t timeout) {
458 std::unique_lock<std::mutex> lk(mLock);
459
460 unique_fd inotifyFd(inotify_init());
461 if (inotifyFd < 0) {
462 ALOGE("inotify init failed");
463 return Status::ERROR;
464 }
465
466 bool ffsEnabled = false;
467 int i = 0;
468 std::string bootMode = GetProperty(PERSISTENT_BOOT_MODE, "");
469
470 if (((functions & GadgetFunction::MTP) != 0)) {
471 ffsEnabled = true;
472 ALOGI("setCurrentUsbFunctions mtp");
473 if (!WriteStringToFile("1", DESC_USE_PATH)) return Status::ERROR;
474
475 if (inotify_add_watch(inotifyFd, "/dev/usb-ffs/mtp/", IN_ALL_EVENTS) == -1)
476 return Status::ERROR;
477
478 if (linkFunction("ffs.mtp", i++)) return Status::ERROR;
479
480 // Add endpoints to be monitored.
481 mEndpointList.push_back("/dev/usb-ffs/mtp/ep1");
482 mEndpointList.push_back("/dev/usb-ffs/mtp/ep2");
483 mEndpointList.push_back("/dev/usb-ffs/mtp/ep3");
484 } else if (((functions & GadgetFunction::PTP) != 0)) {
485 ffsEnabled = true;
486 ALOGI("setCurrentUsbFunctions ptp");
487 if (!WriteStringToFile("1", DESC_USE_PATH)) return Status::ERROR;
488
489 if (inotify_add_watch(inotifyFd, "/dev/usb-ffs/ptp/", IN_ALL_EVENTS) == -1)
490 return Status::ERROR;
491
492
493 if (linkFunction("ffs.ptp", i++)) return Status::ERROR;
494
495 // Add endpoints to be monitored.
496 mEndpointList.push_back("/dev/usb-ffs/ptp/ep1");
497 mEndpointList.push_back("/dev/usb-ffs/ptp/ep2");
498 mEndpointList.push_back("/dev/usb-ffs/ptp/ep3");
499 }
500
501 if ((functions & GadgetFunction::MIDI) != 0) {
502 ALOGI("setCurrentUsbFunctions MIDI");
503 if (linkFunction("midi.gs5", i++)) return Status::ERROR;
504 }
505
506 if ((functions & GadgetFunction::ACCESSORY) != 0) {
507 ALOGI("setCurrentUsbFunctions Accessory");
508 if (linkFunction("accessory.gs2", i++)) return Status::ERROR;
509 }
510
511 if ((functions & GadgetFunction::AUDIO_SOURCE) != 0) {
512 ALOGI("setCurrentUsbFunctions Audio Source");
513 if (linkFunction("audio_source.gs3", i++)) return Status::ERROR;
514 }
515
516 if ((functions & GadgetFunction::RNDIS) != 0) {
517 ALOGI("setCurrentUsbFunctions rndis");
518 if (linkFunction("gsi.rndis", i++)) return Status::ERROR;
519 }
520
521 std::string vendorFunctions = getVendorFunctions();
522 if (vendorFunctions != "") {
523 ALOGI("enable usbradio debug functions");
524 char *function = strtok(const_cast<char *>(vendorFunctions.c_str()), ",");
525 while (function != NULL) {
526 if (string(function) == "diag" && linkFunction("diag.diag", i++))
527 return Status::ERROR;
528 if (string(function) == "serial_cdev" && linkFunction("cser.dun.0", i++))
529 return Status::ERROR;
530 if (string(function) == "rmnet_gsi" && linkFunction("gsi.rmnet", i++))
531 return Status::ERROR;
532 function = strtok(NULL, ",");
533 }
534 }
535
536 if ((functions & GadgetFunction::ADB) != 0) {
537 ffsEnabled = true;
538 ALOGI("setCurrentUsbFunctions Adb");
539 if (!WriteStringToFile("1", DESC_USE_PATH))
540 return Status::ERROR;
541 if (inotify_add_watch(inotifyFd, "/dev/usb-ffs/adb/", IN_ALL_EVENTS) == -1)
542 return Status::ERROR;
543
544 if (linkFunction("ffs.adb", i++)) return Status::ERROR;
545 mEndpointList.push_back("/dev/usb-ffs/adb/ep1");
546 mEndpointList.push_back("/dev/usb-ffs/adb/ep2");
547 ALOGI("Service started");
548 }
549
550 // Pull up the gadget right away when there are no ffs functions.
551 if (!ffsEnabled) {
552 if (!WriteStringToFile(GADGET_NAME, PULLUP_PATH)) return Status::ERROR;
553 mCurrentUsbFunctionsApplied = true;
554 if (callback)
555 callback->setCurrentUsbFunctionsCb(functions, Status::SUCCESS);
556 return Status::SUCCESS;
557 }
558
559 unique_fd eventFd(eventfd(0, 0));
560 if (eventFd == -1) {
561 ALOGE("mEventFd failed to create %d", errno);
562 return Status::ERROR;
563 }
564
565 unique_fd epollFd(epoll_create(2));
566 if (epollFd == -1) {
567 ALOGE("mEpollFd failed to create %d", errno);
568 return Status::ERROR;
569 }
570
571 if (addEpollFd(epollFd, inotifyFd) == -1) return Status::ERROR;
572
573 if (addEpollFd(epollFd, eventFd) == -1) return Status::ERROR;
574
575 mEpollFd = move(epollFd);
576 mInotifyFd = move(inotifyFd);
577 mEventFd = move(eventFd);
578 gadgetPullup = false;
579
580 // Monitors the ffs paths to pull up the gadget when descriptors are written.
581 // Also takes of the pulling up the gadget again if the userspace process
582 // dies and restarts.
583 mMonitor = unique_ptr<thread>(new thread(monitorFfs, this));
584 mMonitorCreated = true;
585 if (DEBUG) ALOGI("Mainthread in Cv");
586
587 if (callback) {
588 if (mCv.wait_for(lk, timeout * 1ms, [] { return gadgetPullup; })) {
589 ALOGI("monitorFfs signalled true");
590 } else {
591 ALOGI("monitorFfs signalled error");
592 // continue monitoring as the descriptors might be written at a later
593 // point.
594 }
595 Return<void> ret = callback->setCurrentUsbFunctionsCb(
596 functions, gadgetPullup ? Status::SUCCESS : Status::ERROR);
597 if (!ret.isOk())
598 ALOGE("setCurrentUsbFunctionsCb error %s", ret.description().c_str());
599 }
600
601 return Status::SUCCESS;
602 }
603
setCurrentUsbFunctions(uint64_t functions,const sp<V1_0::IUsbGadgetCallback> & callback,uint64_t timeout)604 Return<void> UsbGadget::setCurrentUsbFunctions(
605 uint64_t functions, const sp<V1_0::IUsbGadgetCallback> &callback,
606 uint64_t timeout) {
607 std::unique_lock<std::mutex> lk(mLockSetCurrentFunction);
608
609 mCurrentUsbFunctions = functions;
610 mCurrentUsbFunctionsApplied = false;
611
612 // Unlink the gadget and stop the monitor if running.
613 V1_0::Status status = tearDownGadget();
614 if (status != Status::SUCCESS) {
615 goto error;
616 }
617
618 ALOGI("Returned from tearDown gadget");
619
620 // Leave the gadget pulled down to give time for the host to sense disconnect.
621 usleep(DISCONNECT_WAIT_US);
622
623 if (functions == static_cast<uint64_t>(GadgetFunction::NONE)) {
624 if (callback == NULL) return Void();
625 Return<void> ret =
626 callback->setCurrentUsbFunctionsCb(functions, Status::SUCCESS);
627 if (!ret.isOk())
628 ALOGE("Error while calling setCurrentUsbFunctionsCb %s",
629 ret.description().c_str());
630 return Void();
631 }
632
633 status = validateAndSetVidPid(functions);
634
635 if (status != Status::SUCCESS) {
636 goto error;
637 }
638
639 status = setupFunctions(functions, callback, timeout);
640 if (status != Status::SUCCESS) {
641 goto error;
642 }
643
644 ALOGI("Usb Gadget setcurrent functions called successfully");
645 return Void();
646
647 error:
648 ALOGI("Usb Gadget setcurrent functions failed");
649 if (callback == NULL) return Void();
650 Return<void> ret = callback->setCurrentUsbFunctionsCb(functions, status);
651 if (!ret.isOk())
652 ALOGE("Error while calling setCurrentUsbFunctionsCb %s",
653 ret.description().c_str());
654 return Void();
655 }
656 } // namespace implementation
657 } // namespace V1_1
658 } // namespace gadget
659 } // namespace usb
660 } // namespace hardware
661 } // namespace android
662