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/*
* Copyright (C) 2020 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 "libusbconfigfs"
#include "include/UsbGadgetCommon.h"
namespace android {
namespace hardware {
namespace usb {
namespace gadget {
int unlinkFunctions(const char* path) {
DIR* config = opendir(path);
struct dirent* function;
char filepath[kMaxFilePathLength];
int ret = 0;
if (config == NULL) return -1;
// d_type does not seems to be supported in /config
// so filtering by name.
while (((function = readdir(config)) != NULL)) {
if ((strstr(function->d_name, FUNCTION_NAME) == NULL)) continue;
// build the path for each file in the folder.
sprintf(filepath, "%s/%s", path, function->d_name);
ret = remove(filepath);
if (ret) {
ALOGE("Unable remove file %s errno:%d", filepath, errno);
break;
}
}
closedir(config);
return ret;
}
int addEpollFd(const unique_fd& epfd, const unique_fd& fd) {
struct epoll_event event;
int ret;
event.data.fd = fd;
event.events = EPOLLIN;
ret = epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &event);
if (ret) ALOGE("epoll_ctl error %d", errno);
return ret;
}
int linkFunction(const char* function, int index) {
char functionPath[kMaxFilePathLength];
char link[kMaxFilePathLength];
sprintf(functionPath, "%s%s", FUNCTIONS_PATH, function);
sprintf(link, "%s%d", FUNCTION_PATH, index);
if (symlink(functionPath, link)) {
ALOGE("Cannot create symlink %s -> %s errno:%d", link, functionPath, errno);
return -1;
}
return 0;
}
Status setVidPid(const char* vid, const char* pid) {
if (!WriteStringToFile(vid, VENDOR_ID_PATH)) return Status::ERROR;
if (!WriteStringToFile(pid, PRODUCT_ID_PATH)) return Status::ERROR;
return Status::SUCCESS;
}
std::string getVendorFunctions() {
if (GetProperty(kBuildType, "") == "user") return "user";
std::string bootMode = GetProperty(PERSISTENT_BOOT_MODE, "");
std::string persistVendorFunctions = GetProperty(kPersistentVendorConfig, "");
std::string vendorFunctions = GetProperty(kVendorConfig, "");
std::string ret = "";
if (vendorFunctions != "") {
ret = vendorFunctions;
} else if (bootMode == "usbradio" || bootMode == "factory" || bootMode == "ffbm-00" ||
bootMode == "ffbm-01") {
if (persistVendorFunctions != "")
ret = persistVendorFunctions;
else
ret = "diag";
// vendor.usb.config will reflect the current configured functions
SetProperty(kVendorConfig, ret);
}
return ret;
}
Status resetGadget() {
ALOGI("setCurrentUsbFunctions None");
if (!WriteStringToFile("none", PULLUP_PATH)) ALOGI("Gadget cannot be pulled down");
if (!WriteStringToFile("0", DEVICE_CLASS_PATH)) return Status::ERROR;
if (!WriteStringToFile("0", DEVICE_SUB_CLASS_PATH)) return Status::ERROR;
if (!WriteStringToFile("0", DEVICE_PROTOCOL_PATH)) return Status::ERROR;
if (!WriteStringToFile("0", DESC_USE_PATH)) return Status::ERROR;
if (unlinkFunctions(CONFIG_PATH)) return Status::ERROR;
return Status::SUCCESS;
}
Status addGenericAndroidFunctions(MonitorFfs* monitorFfs, uint64_t functions, bool* ffsEnabled,
int* functionCount) {
if (((functions & GadgetFunction::MTP) != 0)) {
*ffsEnabled = true;
ALOGI("setCurrentUsbFunctions mtp");
if (!WriteStringToFile("1", DESC_USE_PATH)) return Status::ERROR;
if (!monitorFfs->addInotifyFd("/dev/usb-ffs/mtp/")) return Status::ERROR;
if (linkFunction("ffs.mtp", (*functionCount)++)) return Status::ERROR;
// Add endpoints to be monitored.
monitorFfs->addEndPoint("/dev/usb-ffs/mtp/ep1");
monitorFfs->addEndPoint("/dev/usb-ffs/mtp/ep2");
monitorFfs->addEndPoint("/dev/usb-ffs/mtp/ep3");
} else if (((functions & GadgetFunction::PTP) != 0)) {
*ffsEnabled = true;
ALOGI("setCurrentUsbFunctions ptp");
if (!WriteStringToFile("1", DESC_USE_PATH)) return Status::ERROR;
if (!monitorFfs->addInotifyFd("/dev/usb-ffs/ptp/")) return Status::ERROR;
if (linkFunction("ffs.ptp", (*functionCount)++)) return Status::ERROR;
// Add endpoints to be monitored.
monitorFfs->addEndPoint("/dev/usb-ffs/ptp/ep1");
monitorFfs->addEndPoint("/dev/usb-ffs/ptp/ep2");
monitorFfs->addEndPoint("/dev/usb-ffs/ptp/ep3");
}
if ((functions & GadgetFunction::MIDI) != 0) {
ALOGI("setCurrentUsbFunctions MIDI");
if (linkFunction("midi.gs5", (*functionCount)++)) return Status::ERROR;
}
if ((functions & GadgetFunction::ACCESSORY) != 0) {
ALOGI("setCurrentUsbFunctions Accessory");
if (linkFunction("accessory.gs2", (*functionCount)++)) return Status::ERROR;
}
if ((functions & GadgetFunction::AUDIO_SOURCE) != 0) {
ALOGI("setCurrentUsbFunctions Audio Source");
if (linkFunction("audio_source.gs3", (*functionCount)++)) return Status::ERROR;
}
if ((functions & GadgetFunction::RNDIS) != 0) {
ALOGI("setCurrentUsbFunctions rndis");
if (linkFunction("gsi.rndis", (*functionCount)++)) return Status::ERROR;
}
return Status::SUCCESS;
}
Status addAdb(MonitorFfs* monitorFfs, int* functionCount) {
ALOGI("setCurrentUsbFunctions Adb");
if (!WriteStringToFile("1", DESC_USE_PATH))
return Status::ERROR;
if (!monitorFfs->addInotifyFd("/dev/usb-ffs/adb/")) return Status::ERROR;
if (linkFunction("ffs.adb", (*functionCount)++)) return Status::ERROR;
monitorFfs->addEndPoint("/dev/usb-ffs/adb/ep1");
monitorFfs->addEndPoint("/dev/usb-ffs/adb/ep2");
ALOGI("Service started");
return Status::SUCCESS;
}
} // namespace gadget
} // namespace usb
} // namespace hardware
} // namespace android
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