| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "android.hardware.usb@1.1-service" |
| |
| #include <android-base/logging.h> |
| #include <assert.h> |
| #include <chrono> |
| #include <dirent.h> |
| #include <pthread.h> |
| #include <regex> |
| #include <stdio.h> |
| #include <sys/types.h> |
| #include <thread> |
| #include <unistd.h> |
| #include <unordered_map> |
| |
| #include <cutils/uevent.h> |
| #include <sys/epoll.h> |
| #include <utils/Errors.h> |
| #include <utils/StrongPointer.h> |
| |
| #include "Usb.h" |
| |
| namespace android { |
| namespace hardware { |
| namespace usb { |
| namespace V1_1 { |
| namespace implementation { |
| |
| // Set by the signal handler to destroy the thread |
| volatile bool destroyThread; |
| |
| int32_t readFile(const std::string &filename, std::string *contents) { |
| FILE *fp; |
| ssize_t read = 0; |
| char *line = NULL; |
| size_t len = 0; |
| |
| fp = fopen(filename.c_str(), "r"); |
| if (fp != NULL) { |
| if ((read = getline(&line, &len, fp)) != -1) { |
| char *pos; |
| if ((pos = strchr(line, '\n')) != NULL) *pos = '\0'; |
| *contents = line; |
| } |
| free(line); |
| fclose(fp); |
| return 0; |
| } else { |
| ALOGE("fopen failed"); |
| } |
| |
| return -1; |
| } |
| |
| std::string appendRoleNodeHelper(const std::string &portName, |
| PortRoleType type) { |
| std::string node("/sys/class/typec/" + portName); |
| |
| switch (type) { |
| case PortRoleType::DATA_ROLE: |
| return node + "/data_role"; |
| case PortRoleType::POWER_ROLE: |
| return node + "/power_role"; |
| case PortRoleType::MODE: |
| return node + "/port_type"; |
| default: |
| return ""; |
| } |
| } |
| |
| std::string convertRoletoString(PortRole role) { |
| if (role.type == PortRoleType::POWER_ROLE) { |
| if (role.role == static_cast<uint32_t>(PortPowerRole::SOURCE)) |
| return "source"; |
| else if (role.role == static_cast<uint32_t>(PortPowerRole::SINK)) |
| return "sink"; |
| } else if (role.type == PortRoleType::DATA_ROLE) { |
| if (role.role == static_cast<uint32_t>(PortDataRole::HOST)) return "host"; |
| if (role.role == static_cast<uint32_t>(PortDataRole::DEVICE)) |
| return "device"; |
| } else if (role.type == PortRoleType::MODE) { |
| if (role.role == static_cast<uint32_t>(PortMode_1_1::UFP)) return "sink"; |
| if (role.role == static_cast<uint32_t>(PortMode_1_1::DFP)) return "source"; |
| } |
| return "none"; |
| } |
| |
| void extractRole(std::string *roleName) { |
| std::size_t first, last; |
| |
| first = roleName->find("["); |
| last = roleName->find("]"); |
| |
| if (first != std::string::npos && last != std::string::npos) { |
| *roleName = roleName->substr(first + 1, last - first - 1); |
| } |
| } |
| |
| void switchToDrp(const std::string &portName) { |
| std::string filename = |
| appendRoleNodeHelper(std::string(portName.c_str()), PortRoleType::MODE); |
| FILE *fp; |
| |
| if (filename != "") { |
| fp = fopen(filename.c_str(), "w"); |
| if (fp != NULL) { |
| int ret = fputs("dual", fp); |
| fclose(fp); |
| if (ret == EOF) |
| ALOGE("Fatal: Error while switching back to drp"); |
| } else { |
| ALOGE("Fatal: Cannot open file to switch back to drp"); |
| } |
| } else { |
| ALOGE("Fatal: invalid node type"); |
| } |
| } |
| |
| bool switchMode(const hidl_string &portName, |
| const PortRole &newRole, struct Usb *usb) { |
| std::string filename = |
| appendRoleNodeHelper(std::string(portName.c_str()), newRole.type); |
| std::string written; |
| FILE *fp; |
| bool roleSwitch = false; |
| |
| if (filename == "") { |
| ALOGE("Fatal: invalid node type"); |
| return false; |
| } |
| |
| fp = fopen(filename.c_str(), "w"); |
| if (fp != NULL) { |
| // Hold the lock here to prevent loosing connected signals |
| // as once the file is written the partner added signal |
| // can arrive anytime. |
| pthread_mutex_lock(&usb->mPartnerLock); |
| usb->mPartnerUp = false; |
| int ret = fputs(convertRoletoString(newRole).c_str(), fp); |
| fclose(fp); |
| |
| if (ret != EOF) { |
| struct timespec to; |
| struct timeval tp; |
| |
| wait_again: |
| gettimeofday(&tp, NULL); |
| to.tv_sec = tp.tv_sec + PORT_TYPE_TIMEOUT; |
| to.tv_nsec = tp.tv_usec * 1000;; |
| |
| int err = pthread_cond_timedwait(&usb->mPartnerCV, &usb->mPartnerLock, &to); |
| // There are no uevent signals which implies role swap timed out. |
| if (err == ETIMEDOUT) { |
| ALOGI("uevents wait timedout"); |
| // Sanity check. |
| } else if (!usb->mPartnerUp) { |
| goto wait_again; |
| // Role switch succeeded since usb->mPartnerUp is true. |
| } else { |
| roleSwitch = true; |
| } |
| } else { |
| ALOGI("Role switch failed while wrting to file"); |
| } |
| pthread_mutex_unlock(&usb->mPartnerLock); |
| } |
| |
| if (!roleSwitch) |
| switchToDrp(std::string(portName.c_str())); |
| |
| return roleSwitch; |
| } |
| |
| |
| |
| Return<void> Usb::switchRole(const hidl_string &portName, |
| const PortRole &newRole) { |
| std::string filename = |
| appendRoleNodeHelper(std::string(portName.c_str()), newRole.type); |
| std::string written; |
| FILE *fp; |
| bool roleSwitch = false; |
| |
| if (filename == "") { |
| ALOGE("Fatal: invalid node type"); |
| return Void(); |
| } |
| |
| pthread_mutex_lock(&mRoleSwitchLock); |
| |
| ALOGI("filename write: %s role:%s", filename.c_str(), |
| convertRoletoString(newRole).c_str()); |
| |
| if (newRole.type == PortRoleType::MODE) { |
| roleSwitch = switchMode(portName, newRole, this); |
| } else { |
| fp = fopen(filename.c_str(), "w"); |
| if (fp != NULL) { |
| int ret = fputs(convertRoletoString(newRole).c_str(), fp); |
| fclose(fp); |
| if ((ret != EOF) && !readFile(filename, &written)) { |
| extractRole(&written); |
| ALOGI("written: %s", written.c_str()); |
| if (written == convertRoletoString(newRole)) { |
| roleSwitch = true; |
| } else { |
| ALOGE("Role switch failed"); |
| } |
| } else { |
| ALOGE("failed to update the new role"); |
| } |
| } else { |
| ALOGE("fopen failed"); |
| } |
| } |
| |
| pthread_mutex_lock(&mLock); |
| if (mCallback_1_0 != NULL) { |
| Return<void> ret = |
| mCallback_1_0->notifyRoleSwitchStatus(portName, newRole, |
| roleSwitch ? Status::SUCCESS : Status::ERROR); |
| if (!ret.isOk()) |
| ALOGE("RoleSwitchStatus error %s", ret.description().c_str()); |
| } else { |
| ALOGE("Not notifying the userspace. Callback is not set"); |
| } |
| pthread_mutex_unlock(&mLock); |
| pthread_mutex_unlock(&mRoleSwitchLock); |
| |
| return Void(); |
| } |
| |
| Status getAccessoryConnected(const std::string &portName, std::string *accessory) { |
| std::string filename = |
| "/sys/class/typec/" + portName + "-partner/accessory_mode"; |
| |
| if (readFile(filename, accessory)) { |
| ALOGE("getAccessoryConnected: Failed to open filesystem node: %s", |
| filename.c_str()); |
| return Status::ERROR; |
| } |
| |
| return Status::SUCCESS; |
| } |
| |
| Status getCurrentRoleHelper(const std::string &portName, bool connected, |
| PortRoleType type, uint32_t *currentRole) { |
| std::string filename; |
| std::string roleName; |
| std::string accessory; |
| |
| // Mode |
| |
| if (type == PortRoleType::POWER_ROLE) { |
| filename = "/sys/class/typec/" + portName + "/power_role"; |
| *currentRole = static_cast<uint32_t>(PortPowerRole::NONE); |
| } else if (type == PortRoleType::DATA_ROLE) { |
| filename = "/sys/class/typec/" + portName + "/data_role"; |
| *currentRole = static_cast<uint32_t>(PortDataRole::NONE); |
| } else if (type == PortRoleType::MODE) { |
| filename = "/sys/class/typec/" + portName + "/data_role"; |
| *currentRole = static_cast<uint32_t>(PortMode_1_1::NONE); |
| } else { |
| return Status::ERROR; |
| } |
| |
| if (!connected) return Status::SUCCESS; |
| |
| if (type == PortRoleType::MODE) { |
| if (getAccessoryConnected(portName, &accessory) != Status::SUCCESS) { |
| return Status::ERROR; |
| } |
| if (accessory == "analog_audio") { |
| *currentRole = static_cast<uint32_t>(PortMode_1_1::AUDIO_ACCESSORY); |
| return Status::SUCCESS; |
| } else if (accessory == "debug") { |
| *currentRole = static_cast<uint32_t>(PortMode_1_1::DEBUG_ACCESSORY); |
| return Status::SUCCESS; |
| } |
| } |
| |
| if (readFile(filename, &roleName)) { |
| ALOGE("getCurrentRole: Failed to open filesystem node: %s", |
| filename.c_str()); |
| return Status::ERROR; |
| } |
| |
| extractRole(&roleName); |
| |
| if (roleName == "source") { |
| *currentRole = static_cast<uint32_t>(PortPowerRole::SOURCE); |
| } else if (roleName == "sink") { |
| *currentRole = static_cast<uint32_t>(PortPowerRole::SINK); |
| } else if (roleName == "host") { |
| if (type == PortRoleType::DATA_ROLE) |
| *currentRole = static_cast<uint32_t>(PortDataRole::HOST); |
| else |
| *currentRole = static_cast<uint32_t>(PortMode_1_1::DFP); |
| } else if (roleName == "device") { |
| if (type == PortRoleType::DATA_ROLE) |
| *currentRole = static_cast<uint32_t>(PortDataRole::DEVICE); |
| else |
| *currentRole = static_cast<uint32_t>(PortMode_1_1::UFP); |
| } else if (roleName != "none") { |
| /* case for none has already been addressed. |
| * so we check if the role isnt none. |
| */ |
| return Status::UNRECOGNIZED_ROLE; |
| } |
| |
| return Status::SUCCESS; |
| } |
| |
| Status getTypeCPortNamesHelper(std::unordered_map<std::string, bool> *names) { |
| DIR *dp; |
| |
| dp = opendir("/sys/class/typec"); |
| if (dp != NULL) { |
| struct dirent *ep; |
| |
| while ((ep = readdir(dp))) { |
| if (ep->d_type == DT_LNK) { |
| if (std::string::npos == std::string(ep->d_name).find("-partner")) { |
| std::unordered_map<std::string, bool>::const_iterator portName = |
| names->find(ep->d_name); |
| if (portName == names->end()) { |
| names->insert({ep->d_name, false}); |
| } |
| } else { |
| (*names)[std::strtok(ep->d_name, "-")] = true; |
| } |
| } |
| } |
| closedir(dp); |
| return Status::SUCCESS; |
| } |
| |
| ALOGE("Failed to open /sys/class/typec"); |
| return Status::ERROR; |
| } |
| |
| bool canSwitchRoleHelper(const std::string &portName, PortRoleType /*type*/) { |
| std::string filename = |
| "/sys/class/typec/" + portName + "-partner/supports_usb_power_delivery"; |
| std::string supportsPD; |
| |
| if (!readFile(filename, &supportsPD)) { |
| if (supportsPD == "yes") { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| /* |
| * Reuse the same method for both V1_0 and V1_1 callback objects. |
| * The caller of this method would reconstruct the V1_0::PortStatus |
| * object if required. |
| */ |
| Status getPortStatusHelper(hidl_vec<PortStatus_1_1> *currentPortStatus_1_1, |
| bool V1_0) { |
| std::unordered_map<std::string, bool> names; |
| Status result = getTypeCPortNamesHelper(&names); |
| int i = -1; |
| |
| if (result == Status::SUCCESS) { |
| currentPortStatus_1_1->resize(names.size()); |
| for (std::pair<std::string, bool> port : names) { |
| i++; |
| ALOGI("%s", port.first.c_str()); |
| (*currentPortStatus_1_1)[i].status.portName = port.first; |
| |
| uint32_t currentRole; |
| if (getCurrentRoleHelper(port.first, port.second, |
| PortRoleType::POWER_ROLE, |
| ¤tRole) == Status::SUCCESS) { |
| (*currentPortStatus_1_1)[i].status.currentPowerRole = |
| static_cast<PortPowerRole>(currentRole); |
| } else { |
| ALOGE("Error while retreiving portNames"); |
| goto done; |
| } |
| |
| if (getCurrentRoleHelper(port.first, port.second, PortRoleType::DATA_ROLE, |
| ¤tRole) == Status::SUCCESS) { |
| (*currentPortStatus_1_1)[i].status.currentDataRole = |
| static_cast<PortDataRole>(currentRole); |
| } else { |
| ALOGE("Error while retreiving current port role"); |
| goto done; |
| } |
| |
| if (getCurrentRoleHelper(port.first, port.second, PortRoleType::MODE, |
| ¤tRole) == Status::SUCCESS) { |
| (*currentPortStatus_1_1)[i].currentMode = |
| static_cast<PortMode_1_1>(currentRole); |
| (*currentPortStatus_1_1)[i].status.currentMode = |
| static_cast<V1_0::PortMode>(currentRole); |
| } else { |
| ALOGE("Error while retreiving current data role"); |
| goto done; |
| } |
| |
| (*currentPortStatus_1_1)[i].status.canChangeMode = true; |
| (*currentPortStatus_1_1)[i].status.canChangeDataRole = |
| port.second ? canSwitchRoleHelper(port.first, PortRoleType::DATA_ROLE) |
| : false; |
| (*currentPortStatus_1_1)[i].status.canChangePowerRole = |
| port.second |
| ? canSwitchRoleHelper(port.first, PortRoleType::POWER_ROLE) |
| : false; |
| |
| ALOGI("connected:%d canChangeMode:%d canChagedata:%d canChangePower:%d", |
| port.second, (*currentPortStatus_1_1)[i].status.canChangeMode, |
| (*currentPortStatus_1_1)[i].status.canChangeDataRole, |
| (*currentPortStatus_1_1)[i].status.canChangePowerRole); |
| |
| if (V1_0) { |
| (*currentPortStatus_1_1)[i].status.supportedModes = V1_0::PortMode::DFP; |
| } else { |
| (*currentPortStatus_1_1)[i].supportedModes = PortMode_1_1::UFP | PortMode_1_1::DFP; |
| (*currentPortStatus_1_1)[i].status.supportedModes = V1_0::PortMode::NONE; |
| (*currentPortStatus_1_1)[i].status.currentMode = V1_0::PortMode::NONE; |
| } |
| } |
| return Status::SUCCESS; |
| } |
| done: |
| return Status::ERROR; |
| } |
| |
| Return<void> Usb::queryPortStatus() { |
| hidl_vec<PortStatus_1_1> currentPortStatus_1_1; |
| hidl_vec<V1_0::PortStatus> currentPortStatus; |
| Status status; |
| sp<IUsbCallback> callback_V1_1 = IUsbCallback::castFrom(mCallback_1_0); |
| |
| pthread_mutex_lock(&mLock); |
| if (mCallback_1_0 != NULL) { |
| if (callback_V1_1 != NULL) { |
| status = getPortStatusHelper(¤tPortStatus_1_1, false); |
| } else { |
| status = getPortStatusHelper(¤tPortStatus_1_1, true); |
| currentPortStatus.resize(currentPortStatus_1_1.size()); |
| for (unsigned long i = 0; i < currentPortStatus_1_1.size(); i++) |
| currentPortStatus[i] = currentPortStatus_1_1[i].status; |
| } |
| |
| Return<void> ret; |
| |
| if (callback_V1_1 != NULL) |
| ret = callback_V1_1->notifyPortStatusChange_1_1(currentPortStatus_1_1, status); |
| else |
| ret = mCallback_1_0->notifyPortStatusChange(currentPortStatus, status); |
| |
| if (!ret.isOk()) |
| ALOGE("queryPortStatus_1_1 error %s", ret.description().c_str()); |
| } else { |
| ALOGI("Notifying userspace skipped. Callback is NULL"); |
| } |
| pthread_mutex_unlock(&mLock); |
| |
| return Void(); |
| } |
| |
| struct data { |
| int uevent_fd; |
| android::hardware::usb::V1_1::implementation::Usb *usb; |
| }; |
| |
| static void uevent_event(uint32_t /*epevents*/, struct data *payload) { |
| char msg[UEVENT_MSG_LEN + 2]; |
| char *cp; |
| int n; |
| |
| n = uevent_kernel_multicast_recv(payload->uevent_fd, msg, UEVENT_MSG_LEN); |
| if (n <= 0) return; |
| if (n >= UEVENT_MSG_LEN) /* overflow -- discard */ |
| return; |
| |
| msg[n] = '\0'; |
| msg[n + 1] = '\0'; |
| cp = msg; |
| |
| while (*cp) { |
| if (std::regex_match(cp, std::regex("(add)(.*)(-partner)"))) { |
| ALOGI("partner added"); |
| pthread_mutex_lock(&payload->usb->mPartnerLock); |
| payload->usb->mPartnerUp = true; |
| pthread_cond_signal(&payload->usb->mPartnerCV); |
| pthread_mutex_unlock(&payload->usb->mPartnerLock); |
| } else if (!strncmp(cp, "DEVTYPE=typec_", strlen("DEVTYPE=typec_"))) { |
| hidl_vec<PortStatus_1_1> currentPortStatus_1_1; |
| ALOGI("uevent received %s", cp); |
| pthread_mutex_lock(&payload->usb->mLock); |
| if (payload->usb->mCallback_1_0 != NULL) { |
| sp<IUsbCallback> callback_V1_1 = IUsbCallback::castFrom(payload->usb->mCallback_1_0); |
| Return<void> ret; |
| |
| // V1_1 callback |
| if (callback_V1_1 != NULL) { |
| Status status = getPortStatusHelper(¤tPortStatus_1_1, false); |
| ret = callback_V1_1->notifyPortStatusChange_1_1( |
| currentPortStatus_1_1, status); |
| } else { // V1_0 callback |
| Status status = getPortStatusHelper(¤tPortStatus_1_1, true); |
| |
| /* |
| * Copying the result from getPortStatusHelper |
| * into V1_0::PortStatus to pass back through |
| * the V1_0 callback object. |
| */ |
| hidl_vec<V1_0::PortStatus> currentPortStatus; |
| currentPortStatus.resize(currentPortStatus_1_1.size()); |
| for (unsigned long i = 0; i < currentPortStatus_1_1.size(); i++) |
| currentPortStatus[i] = currentPortStatus_1_1[i].status; |
| |
| ret = payload->usb->mCallback_1_0->notifyPortStatusChange( |
| currentPortStatus, status); |
| } |
| if (!ret.isOk()) ALOGE("error %s", ret.description().c_str()); |
| } else { |
| ALOGI("Notifying userspace skipped. Callback is NULL"); |
| } |
| pthread_mutex_unlock(&payload->usb->mLock); |
| |
| //Role switch is not in progress and port is in disconnected state |
| if (!pthread_mutex_trylock(&payload->usb->mRoleSwitchLock)) { |
| for (unsigned long i = 0; i < currentPortStatus_1_1.size(); i++) { |
| DIR *dp = opendir(std::string("/sys/class/typec/" |
| + std::string(currentPortStatus_1_1[i].status.portName.c_str()) |
| + "-partner").c_str()); |
| if (dp == NULL) { |
| //PortRole role = {.role = static_cast<uint32_t>(PortMode::UFP)}; |
| switchToDrp(currentPortStatus_1_1[i].status.portName); |
| } else { |
| closedir(dp); |
| } |
| } |
| pthread_mutex_unlock(&payload->usb->mRoleSwitchLock); |
| } |
| break; |
| } |
| /* advance to after the next \0 */ |
| while (*cp++) {} |
| } |
| } |
| |
| void *work(void *param) { |
| int epoll_fd, uevent_fd; |
| struct epoll_event ev; |
| int nevents = 0; |
| struct data payload; |
| |
| ALOGE("creating thread"); |
| |
| uevent_fd = uevent_open_socket(64 * 1024, true); |
| |
| if (uevent_fd < 0) { |
| ALOGE("uevent_init: uevent_open_socket failed\n"); |
| return NULL; |
| } |
| |
| payload.uevent_fd = uevent_fd; |
| payload.usb = (android::hardware::usb::V1_1::implementation::Usb *)param; |
| |
| fcntl(uevent_fd, F_SETFL, O_NONBLOCK); |
| |
| ev.events = EPOLLIN; |
| ev.data.ptr = (void *)uevent_event; |
| |
| epoll_fd = epoll_create(64); |
| if (epoll_fd == -1) { |
| ALOGE("epoll_create failed; errno=%d", errno); |
| goto error; |
| } |
| |
| if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, uevent_fd, &ev) == -1) { |
| ALOGE("epoll_ctl failed; errno=%d", errno); |
| goto error; |
| } |
| |
| while (!destroyThread) { |
| struct epoll_event events[64]; |
| |
| nevents = epoll_wait(epoll_fd, events, 64, -1); |
| if (nevents == -1) { |
| if (errno == EINTR) continue; |
| ALOGE("usb epoll_wait failed; errno=%d", errno); |
| break; |
| } |
| |
| for (int n = 0; n < nevents; ++n) { |
| if (events[n].data.ptr) |
| (*(void (*)(int, struct data *payload))events[n].data.ptr)( |
| events[n].events, &payload); |
| } |
| } |
| |
| ALOGI("exiting worker thread"); |
| error: |
| close(uevent_fd); |
| |
| if (epoll_fd >= 0) close(epoll_fd); |
| |
| return NULL; |
| } |
| |
| void sighandler(int sig) { |
| if (sig == SIGUSR1) { |
| destroyThread = true; |
| ALOGI("destroy set"); |
| return; |
| } |
| signal(SIGUSR1, sighandler); |
| } |
| |
| Return<void> Usb::setCallback(const sp<V1_0::IUsbCallback> &callback) { |
| |
| sp<IUsbCallback> callback_V1_1 = IUsbCallback::castFrom(callback); |
| |
| if (callback != NULL) |
| if (callback_V1_1 == NULL) |
| ALOGI("Registering 1.0 callback"); |
| |
| pthread_mutex_lock(&mLock); |
| /* |
| * When both the old callback and new callback values are NULL, |
| * there is no need to spin off the worker thread. |
| * When both the values are not NULL, we would already have a |
| * worker thread running, so updating the callback object would |
| * be suffice. |
| */ |
| if ((mCallback_1_0 == NULL && callback == NULL) || |
| (mCallback_1_0 != NULL && callback != NULL)) { |
| /* |
| * Always store as V1_0 callback object. Type cast to V1_1 |
| * when the callback is actually invoked. |
| */ |
| mCallback_1_0 = callback; |
| pthread_mutex_unlock(&mLock); |
| return Void(); |
| } |
| |
| mCallback_1_0 = callback; |
| ALOGI("registering callback"); |
| |
| // Kill the worker thread if the new callback is NULL. |
| if (mCallback_1_0 == NULL) { |
| pthread_mutex_unlock(&mLock); |
| if (!pthread_kill(mPoll, SIGUSR1)) { |
| pthread_join(mPoll, NULL); |
| ALOGI("pthread destroyed"); |
| } |
| return Void(); |
| } |
| |
| destroyThread = false; |
| signal(SIGUSR1, sighandler); |
| |
| /* |
| * Create a background thread if the old callback value is NULL |
| * and being updated with a new value. |
| */ |
| if (pthread_create(&mPoll, NULL, work, this)) { |
| ALOGE("pthread creation failed %d", errno); |
| mCallback_1_0 = NULL; |
| } |
| |
| pthread_mutex_unlock(&mLock); |
| return Void(); |
| } |
| |
| } // namespace implementation |
| } // namespace V1_0 |
| } // namespace usb |
| } // namespace hardware |
| } // namespace android |