blob: 3261f8196c5e620c769e34d801def24e2ccd4534 [file] [log] [blame]
/*
* Copyright (C) 2016 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 <poll.h>
#include <sys/select.h>
#include <unistd.h>
#include <memory>
#include <base/logging.h>
#include <brillo/flag_helper.h>
#include <peripheralmanager/peripheral_manager_client.h>
int main(int argc, char* argv[]) {
DEFINE_string(pin, "", "Pin to watch");
DEFINE_bool(select, false, "Use select instead of poll");
brillo::FlagHelper::Init(argc, argv, "Watches a GPIO.");
logging::InitLogging(logging::LoggingSettings());
std::string pin_name = "IO1";
if (!FLAGS_pin.empty())
pin_name = FLAGS_pin;
// Get a client to the PeripheralManager.
BPeripheralManagerClient* client = BPeripheralManagerClient_new();
if (!client) {
LOG(ERROR) << "Failed to connect to client";
return 1;
}
// Open GPIO pin.
BGpio* my_gpio;
if (BPeripheralManagerClient_openGpio(client, pin_name.c_str(), &my_gpio)) {
LOG(ERROR) << "Failed to open Gpio";
return 1;
}
// Set the direction to in.
if (BGpio_setDirection(my_gpio, DIRECTION_IN)) {
LOG(ERROR) << "Failed to set gpio pin direction";
return 1;
}
// Set the edge trigger type for interrupts.
if (BGpio_setEdgeTriggerType(my_gpio, BOTH_EDGE)) {
LOG(ERROR) << "failed to set the edge type";
return 1;
}
// Get the file descriptor used to poll for data.
int fd = -1;
if (BGpio_getPollingFd(my_gpio, &fd)) {
LOG(ERROR) << "failed to get the fd";
return 1;
}
if (FLAGS_select) {
fd_set ifds;
FD_ZERO(&ifds);
FD_SET(fd, &ifds);
for (int i = 0; i < 30; i++) {
select(fd + 1, NULL, NULL, &ifds, NULL);
LOG(INFO) << "received event";
BGpio_ackInterruptEvent(fd);
}
} else {
struct pollfd poller = {
.fd = fd,
.events = POLLPRI | POLLERR,
.revents = 0,
};
for (int i = 0; i < 30; i++) {
// Poll with no timeout.
poll(&poller, 1, -1);
LOG(INFO) << "received an event ";
BGpio_ackInterruptEvent(fd);
poller.revents = 0;
}
}
close(fd);
// Release the gpio pin
BGpio_delete(my_gpio);
// Close the connection to PeripheralManager.
BPeripheralManagerClient_delete(client);
LOG(INFO) << "Exiting";
return 0;
}