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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.
#include <err.h>
#include <getopt.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <string>
#include <string_view>
#include <variant>
#include <vector>
#include <libusb/libusb.h>
struct AllDevices {};
struct SingleDevice {};
struct Serial {
std::string_view serial;
};
using DeviceSelection = std::variant<std::monostate, AllDevices, SingleDevice, Serial>;
[[noreturn]] static void Usage(int rc) {
fprintf(stderr, "usage: [ANDROID_SERIAL=SERIAL] usbreset [-d] [-s SERIAL]\n");
fprintf(stderr, "\t-a --all\t\tReset all connected devices\n");
fprintf(stderr, "\t-d --device\t\tReset the single connected device\n");
fprintf(stderr, "\t-s --serial\t\tReset device with specified serial\n");
exit(rc);
}
static void SetOption(DeviceSelection* out, DeviceSelection in) {
if (!std::get_if<std::monostate>(out)) {
printf("error: multiple device selection options provided\n");
Usage(1);
}
*out = in;
}
static __attribute__((format(printf, 2, 3))) void PrintLibusbError(int err, const char* fmt, ...) {
va_list args;
va_start(args, fmt);
vprintf(fmt, args);
vprintf(fmt, args);
va_end(args);
printf(": %s", libusb_strerror(static_cast<libusb_error>(err)));
}
static bool IsAdbInterface(const libusb_interface_descriptor* desc) {
return desc->bInterfaceClass == 0xFF && desc->bInterfaceSubClass == 0x42 &&
desc->bInterfaceProtocol == 0x1;
}
int main(int argc, char** argv) {
std::variant<std::monostate, AllDevices, SingleDevice, Serial> selection;
static constexpr struct option long_opts[] = {
{"all", 0, 0, 'a'}, {"help", 0, 0, 'h'}, {"serial", required_argument, 0, 's'},
{"device", 0, 0, 'd'}, {0, 0, 0, 0},
};
int opt;
while ((opt = getopt_long(argc, argv, "adhs:", long_opts, nullptr)) != -1) {
if (opt == 'h') {
Usage(0);
} else if (opt == 'a') {
SetOption(&selection, AllDevices{});
} else if (opt == 's') {
SetOption(&selection, Serial{optarg});
} else if (opt == 'd') {
SetOption(&selection, Serial{optarg});
} else {
errx(1, "unknown option: '%c'", opt);
}
}
if (std::get_if<std::monostate>(&selection)) {
const char* env = getenv("ANDROID_SERIAL");
if (env) {
SetOption(&selection, Serial{env});
} else {
fprintf(stderr, "adb_usbreset: no device specified\n");
Usage(1);
}
}
libusb_context* ctx;
int rc = libusb_init(&ctx);
if (rc != LIBUSB_SUCCESS) {
PrintLibusbError(rc, "error: failed to initialize libusb");
exit(1);
}
libusb_device** device_list;
ssize_t device_count = libusb_get_device_list(ctx, &device_list);
if (device_count < 0) {
PrintLibusbError(device_count, "error: failed to list devices");
exit(1);
}
std::vector<std::pair<std::string, libusb_device_handle*>> selected_devices;
for (int i = 0; i < device_count; ++i) {
libusb_device* device = device_list[i];
libusb_device_descriptor device_desc;
// Always succeeds for LIBUSB_API_VERSION >= 0x01000102.
libusb_get_device_descriptor(device, &device_desc);
static_assert(LIBUSB_API_VERSION >= 0x01000102);
libusb_config_descriptor* config_desc;
rc = libusb_get_active_config_descriptor(device, &config_desc);
if (rc != 0) {
PrintLibusbError(rc, "warning: failed to get config descriptor");
continue;
}
bool found_adb_interface = false;
for (int i = 0; i < config_desc->bNumInterfaces; ++i) {
if (IsAdbInterface(&config_desc->interface[i].altsetting[0])) {
found_adb_interface = true;
break;
}
}
if (found_adb_interface) {
libusb_device_handle* device_handle;
rc = libusb_open(device, &device_handle);
if (rc != 0) {
PrintLibusbError(rc, "warning: failed to open device");
continue;
}
char buf[128];
rc = libusb_get_string_descriptor_ascii(device_handle, device_desc.iSerialNumber,
reinterpret_cast<unsigned char*>(buf),
sizeof(buf));
if (rc < 0) {
PrintLibusbError(rc, "warning: failed to get device serial");
continue;
}
std::string serial(buf, buf + rc);
if (auto s = std::get_if<Serial>(&selection)) {
if (s->serial == serial) {
selected_devices.push_back(std::make_pair(std::move(serial), device_handle));
}
} else {
selected_devices.push_back(std::make_pair(std::move(serial), device_handle));
}
}
}
if (selected_devices.empty()) {
errx(1, "no devices match criteria");
} else if (std::get_if<SingleDevice>(&selection) && selected_devices.size() != 1) {
errx(1, "more than 1 device connected");
}
bool success = true;
for (auto& [serial, device_handle] : selected_devices) {
rc = libusb_reset_device(device_handle);
// libusb_reset_device will try to restore the previous state, and will return
// LIBUSB_ERROR_NOT_FOUND if it can't.
if (rc == 0 || rc == LIBUSB_ERROR_NOT_FOUND) {
printf("%s: successfully reset\n", serial.c_str());
} else {
PrintLibusbError(rc, "%s: failed to reset", serial.c_str());
success = false;
}
}
return !success;
}
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