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@1.0-service.crosshatch"
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_0 {
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
linkFunction(const char * function,int index)286 static int linkFunction(const char *function, int index) {
287 char functionPath[MAX_FILE_PATH_LENGTH];
288 char link[MAX_FILE_PATH_LENGTH];
289
290 sprintf(functionPath, "%s%s", FUNCTIONS_PATH, function);
291 sprintf(link, "%s%d", FUNCTION_PATH, index);
292 if (symlink(functionPath, link)) {
293 ALOGE("Cannot create symlink %s -> %s errno:%d", link, functionPath, errno);
294 return -1;
295 }
296 return 0;
297 }
298
setVidPid(const char * vid,const char * pid)299 static V1_0::Status setVidPid(const char *vid, const char *pid) {
300 if (!WriteStringToFile(vid, VENDOR_ID_PATH)) return Status::ERROR;
301
302 if (!WriteStringToFile(pid, PRODUCT_ID_PATH)) return Status::ERROR;
303
304 return Status::SUCCESS;
305 }
306
getVendorFunctions()307 static std::string getVendorFunctions() {
308 if (GetProperty(BUILD_TYPE, "") == "user") return "user";
309
310 std::string bootMode = GetProperty(PERSISTENT_BOOT_MODE, "");
311 std::string persistVendorFunctions =
312 GetProperty(PERSISTENT_VENDOR_CONFIG, "");
313 std::string vendorFunctions = GetProperty(VENDOR_CONFIG, "");
314 std::string ret = "";
315
316 if (vendorFunctions != "") {
317 ret = vendorFunctions;
318 } else if (bootMode == "usbradio") {
319 if (persistVendorFunctions != "")
320 ret = persistVendorFunctions;
321 else
322 ret = "diag";
323 // vendor.usb.config will reflect the current configured functions
324 SetProperty(VENDOR_CONFIG, ret);
325 }
326
327 return ret;
328 }
329
validateAndSetVidPid(uint64_t functions)330 static V1_0::Status validateAndSetVidPid(uint64_t functions) {
331 V1_0::Status ret = Status::SUCCESS;
332 std::string vendorFunctions = getVendorFunctions();
333
334 switch (functions) {
335 case static_cast<uint64_t>(GadgetFunction::MTP):
336 if (vendorFunctions == "diag") {
337 ret = setVidPid("0x05C6", "0x901B");
338 } else {
339 if (!(vendorFunctions == "user" || vendorFunctions == ""))
340 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
341 ret = setVidPid("0x18d1", "0x4ee1");
342 }
343 break;
344 case GadgetFunction::ADB | GadgetFunction::MTP:
345 if (vendorFunctions == "diag") {
346 ret = setVidPid("0x05C6", "0x903A");
347 } else {
348 if (!(vendorFunctions == "user" || vendorFunctions == ""))
349 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
350 ret = setVidPid("0x18d1", "0x4ee2");
351 }
352 break;
353 case static_cast<uint64_t>(GadgetFunction::RNDIS):
354 if (vendorFunctions == "diag") {
355 ret = setVidPid("0x05C6", "0x902C");
356 } else if (vendorFunctions == "serial_cdev,diag") {
357 ret = setVidPid("0x05C6", "0x90B5");
358 } else {
359 if (!(vendorFunctions == "user" || vendorFunctions == ""))
360 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
361 ret = setVidPid("0x18d1", "0x4ee3");
362 }
363 break;
364 case GadgetFunction::ADB | GadgetFunction::RNDIS:
365 if (vendorFunctions == "diag") {
366 ret = setVidPid("0x05C6", "0x902D");
367 } else if (vendorFunctions == "serial_cdev,diag") {
368 ret = setVidPid("0x05C6", "0x90B6");
369 } else {
370 if (!(vendorFunctions == "user" || vendorFunctions == ""))
371 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
372 ret = setVidPid("0x18d1", "0x4ee4");
373 }
374 break;
375 case static_cast<uint64_t>(GadgetFunction::PTP):
376 if (!(vendorFunctions == "user" || vendorFunctions == ""))
377 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
378 ret = setVidPid("0x18d1", "0x4ee5");
379 break;
380 case GadgetFunction::ADB | GadgetFunction::PTP:
381 if (!(vendorFunctions == "user" || vendorFunctions == ""))
382 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
383 ret = setVidPid("0x18d1", "0x4ee6");
384 break;
385 case static_cast<uint64_t>(GadgetFunction::ADB):
386 if (vendorFunctions == "diag") {
387 ret = setVidPid("0x05C6", "0x901D");
388 } else if (vendorFunctions == "diag,serial_cdev,rmnet_gsi") {
389 ret = setVidPid("0x05C6", "0x9091");
390 } else if (vendorFunctions == "diag,serial_cdev") {
391 ret = setVidPid("0x05C6", "0x901F");
392 } else {
393 if (!(vendorFunctions == "user" || vendorFunctions == ""))
394 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
395 ret = setVidPid("0x18d1", "0x4ee7");
396 }
397 break;
398 case static_cast<uint64_t>(GadgetFunction::MIDI):
399 if (!(vendorFunctions == "user" || vendorFunctions == ""))
400 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
401 ret = setVidPid("0x18d1", "0x4ee8");
402 break;
403 case GadgetFunction::ADB | GadgetFunction::MIDI:
404 if (!(vendorFunctions == "user" || vendorFunctions == ""))
405 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
406 ret = setVidPid("0x18d1", "0x4ee9");
407 break;
408 case static_cast<uint64_t>(GadgetFunction::ACCESSORY):
409 if (!(vendorFunctions == "user" || vendorFunctions == ""))
410 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
411 ret = setVidPid("0x18d1", "0x2d00");
412 break;
413 case GadgetFunction::ADB | GadgetFunction::ACCESSORY:
414 if (!(vendorFunctions == "user" || vendorFunctions == ""))
415 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
416 ret = setVidPid("0x18d1", "0x2d01");
417 break;
418 case static_cast<uint64_t>(GadgetFunction::AUDIO_SOURCE):
419 if (!(vendorFunctions == "user" || vendorFunctions == ""))
420 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
421 ret = setVidPid("0x18d1", "0x2d02");
422 break;
423 case GadgetFunction::ADB | GadgetFunction::AUDIO_SOURCE:
424 if (!(vendorFunctions == "user" || vendorFunctions == ""))
425 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
426 ret = setVidPid("0x18d1", "0x2d03");
427 break;
428 case GadgetFunction::ACCESSORY | GadgetFunction::AUDIO_SOURCE:
429 if (!(vendorFunctions == "user" || vendorFunctions == ""))
430 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
431 ret = setVidPid("0x18d1", "0x2d04");
432 break;
433 case GadgetFunction::ADB | GadgetFunction::ACCESSORY |
434 GadgetFunction::AUDIO_SOURCE:
435 if (!(vendorFunctions == "user" || vendorFunctions == ""))
436 ALOGE("Invalid vendorFunctions set: %s", vendorFunctions.c_str());
437 ret = setVidPid("0x18d1", "0x2d05");
438 break;
439 default:
440 ALOGE("Combination not supported");
441 ret = Status::CONFIGURATION_NOT_SUPPORTED;
442 }
443 return ret;
444 }
445
setupFunctions(uint64_t functions,const sp<V1_0::IUsbGadgetCallback> & callback,uint64_t timeout)446 V1_0::Status UsbGadget::setupFunctions(
447 uint64_t functions, const sp<V1_0::IUsbGadgetCallback> &callback,
448 uint64_t timeout) {
449 std::unique_lock<std::mutex> lk(mLock);
450
451 unique_fd inotifyFd(inotify_init());
452 if (inotifyFd < 0) {
453 ALOGE("inotify init failed");
454 return Status::ERROR;
455 }
456
457 bool ffsEnabled = false;
458 int i = 0;
459 std::string bootMode = GetProperty(PERSISTENT_BOOT_MODE, "");
460
461 if (((functions & GadgetFunction::MTP) != 0)) {
462 ffsEnabled = true;
463 ALOGI("setCurrentUsbFunctions mtp");
464 if (!WriteStringToFile("1", DESC_USE_PATH)) return Status::ERROR;
465
466 if (inotify_add_watch(inotifyFd, "/dev/usb-ffs/mtp/", IN_ALL_EVENTS) == -1)
467 return Status::ERROR;
468
469 if (linkFunction("ffs.mtp", i++)) return Status::ERROR;
470
471 // Add endpoints to be monitored.
472 mEndpointList.push_back("/dev/usb-ffs/mtp/ep1");
473 mEndpointList.push_back("/dev/usb-ffs/mtp/ep2");
474 mEndpointList.push_back("/dev/usb-ffs/mtp/ep3");
475 } else if (((functions & GadgetFunction::PTP) != 0)) {
476 ffsEnabled = true;
477 ALOGI("setCurrentUsbFunctions ptp");
478 if (!WriteStringToFile("1", DESC_USE_PATH)) return Status::ERROR;
479
480 if (inotify_add_watch(inotifyFd, "/dev/usb-ffs/ptp/", IN_ALL_EVENTS) == -1)
481 return Status::ERROR;
482
483
484 if (linkFunction("ffs.ptp", i++)) return Status::ERROR;
485
486 // Add endpoints to be monitored.
487 mEndpointList.push_back("/dev/usb-ffs/ptp/ep1");
488 mEndpointList.push_back("/dev/usb-ffs/ptp/ep2");
489 mEndpointList.push_back("/dev/usb-ffs/ptp/ep3");
490 }
491
492 if ((functions & GadgetFunction::MIDI) != 0) {
493 ALOGI("setCurrentUsbFunctions MIDI");
494 if (linkFunction("midi.gs5", i++)) return Status::ERROR;
495 }
496
497 if ((functions & GadgetFunction::ACCESSORY) != 0) {
498 ALOGI("setCurrentUsbFunctions Accessory");
499 if (linkFunction("accessory.gs2", i++)) return Status::ERROR;
500 }
501
502 if ((functions & GadgetFunction::AUDIO_SOURCE) != 0) {
503 ALOGI("setCurrentUsbFunctions Audio Source");
504 if (linkFunction("audio_source.gs3", i++)) return Status::ERROR;
505 }
506
507 if ((functions & GadgetFunction::RNDIS) != 0) {
508 ALOGI("setCurrentUsbFunctions rndis");
509 if (linkFunction("gsi.rndis", i++)) return Status::ERROR;
510 }
511
512 std::string vendorFunctions = getVendorFunctions();
513 if (vendorFunctions != "") {
514 ALOGI("enable usbradio debug functions");
515 char *function = strtok(const_cast<char *>(vendorFunctions.c_str()), ",");
516 while (function != NULL) {
517 if (string(function) == "diag" && linkFunction("diag.diag", i++))
518 return Status::ERROR;
519 if (string(function) == "serial_cdev" && linkFunction("cser.dun.0", i++))
520 return Status::ERROR;
521 if (string(function) == "rmnet_gsi" && linkFunction("gsi.rmnet", i++))
522 return Status::ERROR;
523 function = strtok(NULL, ",");
524 }
525 }
526
527 if ((functions & GadgetFunction::ADB) != 0) {
528 ffsEnabled = true;
529 ALOGI("setCurrentUsbFunctions Adb");
530 if (inotify_add_watch(inotifyFd, "/dev/usb-ffs/adb/", IN_ALL_EVENTS) == -1)
531 return Status::ERROR;
532
533 if (linkFunction("ffs.adb", i++)) return Status::ERROR;
534 mEndpointList.push_back("/dev/usb-ffs/adb/ep1");
535 mEndpointList.push_back("/dev/usb-ffs/adb/ep2");
536 ALOGI("Service started");
537 }
538
539 // Pull up the gadget right away when there are no ffs functions.
540 if (!ffsEnabled) {
541 if (!WriteStringToFile(GADGET_NAME, PULLUP_PATH)) return Status::ERROR;
542 mCurrentUsbFunctionsApplied = true;
543 if (callback)
544 callback->setCurrentUsbFunctionsCb(functions, Status::SUCCESS);
545 return Status::SUCCESS;
546 }
547
548 unique_fd eventFd(eventfd(0, 0));
549 if (eventFd == -1) {
550 ALOGE("mEventFd failed to create %d", errno);
551 return Status::ERROR;
552 }
553
554 unique_fd epollFd(epoll_create1(EPOLL_CLOEXEC));
555 if (epollFd == -1) {
556 ALOGE("mEpollFd failed to create %d", errno);
557 return Status::ERROR;
558 }
559
560 if (addEpollFd(epollFd, inotifyFd) == -1) return Status::ERROR;
561
562 if (addEpollFd(epollFd, eventFd) == -1) return Status::ERROR;
563
564 mEpollFd = move(epollFd);
565 mInotifyFd = move(inotifyFd);
566 mEventFd = move(eventFd);
567 gadgetPullup = false;
568
569 // Monitors the ffs paths to pull up the gadget when descriptors are written.
570 // Also takes of the pulling up the gadget again if the userspace process
571 // dies and restarts.
572 mMonitor = unique_ptr<thread>(new thread(monitorFfs, this));
573 mMonitorCreated = true;
574 if (DEBUG) ALOGI("Mainthread in Cv");
575
576 if (callback) {
577 if (mCv.wait_for(lk, timeout * 1ms, [] { return gadgetPullup; })) {
578 ALOGI("monitorFfs signalled true");
579 } else {
580 ALOGI("monitorFfs signalled error");
581 // continue monitoring as the descriptors might be written at a later
582 // point.
583 }
584 Return<void> ret = callback->setCurrentUsbFunctionsCb(
585 functions, gadgetPullup ? Status::SUCCESS : Status::ERROR);
586 if (!ret.isOk())
587 ALOGE("setCurrentUsbFunctionsCb error %s", ret.description().c_str());
588 }
589
590 return Status::SUCCESS;
591 }
592
setCurrentUsbFunctions(uint64_t functions,const sp<V1_0::IUsbGadgetCallback> & callback,uint64_t timeout)593 Return<void> UsbGadget::setCurrentUsbFunctions(
594 uint64_t functions, const sp<V1_0::IUsbGadgetCallback> &callback,
595 uint64_t timeout) {
596 std::unique_lock<std::mutex> lk(mLockSetCurrentFunction);
597
598 mCurrentUsbFunctions = functions;
599 mCurrentUsbFunctionsApplied = false;
600
601 // Unlink the gadget and stop the monitor if running.
602 V1_0::Status status = tearDownGadget();
603 if (status != Status::SUCCESS) {
604 goto error;
605 }
606
607 ALOGI("Returned from tearDown gadget");
608
609 // Leave the gadget pulled down to give time for the host to sense disconnect.
610 usleep(DISCONNECT_WAIT_US);
611
612 if (functions == static_cast<uint64_t>(GadgetFunction::NONE)) {
613 if (callback == NULL) return Void();
614 Return<void> ret =
615 callback->setCurrentUsbFunctionsCb(functions, Status::SUCCESS);
616 if (!ret.isOk())
617 ALOGE("Error while calling setCurrentUsbFunctionsCb %s",
618 ret.description().c_str());
619 return Void();
620 }
621
622 status = validateAndSetVidPid(functions);
623
624 if (status != Status::SUCCESS) {
625 goto error;
626 }
627
628 status = setupFunctions(functions, callback, timeout);
629 if (status != Status::SUCCESS) {
630 goto error;
631 }
632
633 ALOGI("Usb Gadget setcurrent functions called successfully");
634 return Void();
635
636 error:
637 ALOGI("Usb Gadget setcurrent functions failed");
638 if (callback == NULL) return Void();
639 Return<void> ret = callback->setCurrentUsbFunctionsCb(functions, status);
640 if (!ret.isOk())
641 ALOGE("Error while calling setCurrentUsbFunctionsCb %s",
642 ret.description().c_str());
643 return Void();
644 }
645 } // namespace implementation
646 } // namespace V1_0
647 } // namespace gadget
648 } // namespace usb
649 } // namespace hardware
650 } // namespace android
651