subsurface/core/serial_usb_android.cpp

#include "libdivecomputer.h"
#include <libdivecomputer/context.h>
#include <libdivecomputer/custom.h>

#include <cstring>

#include <QAndroidJniObject>
#include <QAndroidJniEnvironment>
#include <QtAndroid>

#include <thread>

#include <android/log.h>

#include "serial_usb_android.h"

#define INFO(context, fmt, ...)	 __android_log_print(ANDROID_LOG_DEBUG, __FILE__, "INFO: " fmt "\n", ##__VA_ARGS__)
#define ERROR(context, fmt, ...) __android_log_print(ANDROID_LOG_DEBUG, __FILE__, "ERROR: " fmt "\n", ##__VA_ARGS__)
#define TRACE INFO

static dc_status_t serial_usb_android_sleep(void *io, unsigned int timeout)
{
	TRACE (device->context, "%s: %i", __FUNCTION__, timeout);

	QAndroidJniObject *device = static_cast<QAndroidJniObject *>(io);
	if (device == nullptr)
		return DC_STATUS_INVALIDARGS;

	std::this_thread::sleep_for(std::chrono::milliseconds(timeout));
	return DC_STATUS_SUCCESS;
}

static dc_status_t serial_usb_android_set_timeout(void *io, int timeout)
{
	TRACE (device->context, "%s: %i", __FUNCTION__, timeout);

	QAndroidJniObject *device = static_cast<QAndroidJniObject *>(io);
	if (device == nullptr)
		return DC_STATUS_INVALIDARGS;

	return static_cast<dc_status_t>(device->callMethod<jint>("set_timeout", "(I)I", timeout));
}

static dc_status_t serial_usb_android_set_dtr(void *io, unsigned int value)
{
	TRACE (device->context, "%s: %i", __FUNCTION__, value);

	QAndroidJniObject *device = static_cast<QAndroidJniObject *>(io);
	if (device == nullptr)
		return DC_STATUS_INVALIDARGS;

	return static_cast<dc_status_t>(device->callMethod<jint>("set_dtr", "(Z)I", value));
}

static dc_status_t serial_usb_android_set_rts(void *io, unsigned int value)
{
	TRACE (device->context, "%s: %i", __FUNCTION__, value);

	QAndroidJniObject *device = static_cast<QAndroidJniObject *>(io);
	if (device == nullptr)
		return DC_STATUS_INVALIDARGS;

	return static_cast<dc_status_t>(device->callMethod<jint>("set_rts", "(Z)I", value));
}

static dc_status_t serial_usb_android_close(void *io)
{
	TRACE (device->context, "%s", __FUNCTION__);

	QAndroidJniObject *device = static_cast<QAndroidJniObject *>(io);
	if (device == nullptr)
		return DC_STATUS_SUCCESS;

	auto retval = static_cast<dc_status_t>(device->callMethod<jint>("close", "()I"));
	delete device;
	return retval;
}

static dc_status_t serial_usb_android_purge(void *io, dc_direction_t direction)
{
	TRACE (device->context, "%s: %i", __FUNCTION__, direction);

	QAndroidJniObject *device = static_cast<QAndroidJniObject *>(io);
	if (device == nullptr)
		return DC_STATUS_INVALIDARGS;

	return static_cast<dc_status_t>(device->callMethod<jint>("purge", "(I)I", direction));
}

static dc_status_t serial_usb_android_configure(void *io, unsigned int baudrate, unsigned int databits, dc_parity_t parity,
			     dc_stopbits_t stopbits, dc_flowcontrol_t flowcontrol)
{
	TRACE (device->context, "%s: baudrate=%i, databits=%i, parity=%i, stopbits=%i, flowcontrol=%i", __FUNCTION__,
	       baudrate, databits, parity, stopbits, flowcontrol);

	QAndroidJniObject *device = static_cast<QAndroidJniObject *>(io);
	if (device == NULL)
		return DC_STATUS_INVALIDARGS;

	return static_cast<dc_status_t>(device->callMethod<jint>("configure", "(IIII)I", baudrate, databits, parity, stopbits));
}

/*
static dc_status_t serial_usb_android_get_available (void *io, size_t *value)
{
	INFO (device->context, "%s", __FUNCTION__);

	QAndroidJniObject *device = static_cast<QAndroidJniObject*>(io);
	if (device == NULL)
		return DC_STATUS_INVALIDARGS;


	auto retval = device->callMethod<jint>("get_available", "()I");
	if(retval < 0){
		INFO (device->context, "Error in %s, retval %i", __FUNCTION__, retval);
		return static_cast<dc_status_t>(retval);
	}

	*value = retval;
	return DC_STATUS_SUCCESS;
}
*/

static dc_status_t serial_usb_android_read(void *io, void *data, size_t size, size_t *actual)
{
	TRACE (device->context, "%s: size: %i", __FUNCTION__, size);

	QAndroidJniObject *device = static_cast<QAndroidJniObject *>(io);
	if (device == NULL)
		return DC_STATUS_INVALIDARGS;

	QAndroidJniEnvironment env;
	jbyteArray array = env->NewByteArray(size);
	env->SetByteArrayRegion(array, 0, size, (const jbyte *) data);

	auto retval = device->callMethod<jint>("read", "([B)I", array);
	if (retval < 0) {
		env->DeleteLocalRef(array);
		INFO (device->context, "Error in %s, retval %i", __FUNCTION__, retval);
		return static_cast<dc_status_t>(retval);
	}
	*actual = retval;
	env->GetByteArrayRegion(array, 0, retval, (jbyte *) data);
	env->DeleteLocalRef(array);
	TRACE (device->context, "%s: actual read size: %i", __FUNCTION__, retval);

	if (retval < size)
		return DC_STATUS_TIMEOUT;
	else
		return DC_STATUS_SUCCESS;
}

static dc_status_t serial_usb_android_write(void *io, const void *data, size_t size, size_t *actual)
{
	TRACE (device->context, "%s: size: %i", __FUNCTION__, size);

	QAndroidJniObject *device = static_cast<QAndroidJniObject *>(io);
	if (device == NULL)
		return DC_STATUS_INVALIDARGS;

	QAndroidJniEnvironment env;
	jbyteArray array = env->NewByteArray(size);
	env->SetByteArrayRegion(array, 0, size, (const jbyte *) data);

	auto retval = device->callMethod<jint>("write", "([B)I", array);
	env->DeleteLocalRef(array);
	if (retval < 0) {
		INFO (device->context, "Error in %s, retval %i", __FUNCTION__, retval);
		return static_cast<dc_status_t>(retval);
	}
	*actual = retval;
	TRACE (device->context, "%s: actual write size: %i", __FUNCTION__, retval);
	return DC_STATUS_SUCCESS;
}

dc_status_t serial_usb_android_open(dc_iostream_t **iostream, dc_context_t *context, QAndroidJniObject usbDevice, std::string driverClassName)
{
	TRACE(device->contxt, "%s", __FUNCTION__);

	static const dc_custom_cbs_t callbacks = {
		.set_timeout = serial_usb_android_set_timeout, /* set_timeout */
		.set_dtr = serial_usb_android_set_dtr, /* set_dtr */
		.set_rts = serial_usb_android_set_rts, /* set_rts */
		//.get_available = serial_usb_android_get_available,
		.configure = serial_usb_android_configure,
		.read = serial_usb_android_read,
		.write = serial_usb_android_write,
		.purge = serial_usb_android_purge,
		.sleep = serial_usb_android_sleep, /* sleep */
		.close = serial_usb_android_close, /* close */
	};

	QAndroidJniObject localdevice = QAndroidJniObject::callStaticObjectMethod("org/subsurfacedivelog/mobile/AndroidSerial",
										  "open_android_serial",
										  "(Landroid/hardware/usb/UsbDevice;Ljava/lang/String;)Lorg/subsurfacedivelog/mobile/AndroidSerial;",
										  usbDevice.object<jobject>(),
										  QAndroidJniObject::fromString(driverClassName.c_str()).object());
	if (localdevice == nullptr)
		return DC_STATUS_IO;

	QAndroidJniObject *device = new QAndroidJniObject(localdevice);
	TRACE(device->contxt, "%s", "calling dc_custom_open())");
	return dc_custom_open(iostream, context, DC_TRANSPORT_SERIAL, &callbacks, device);
}

std::vector<android_usb_serial_device_descriptor> serial_usb_android_get_devices(bool driverSelection)
{
	std::vector<std::string> driverNames;
	if (driverSelection)
		driverNames = { "", "CdcAcmSerialDriver", "Ch34xSerialDriver", "Cp21xxSerialDriver", "FtdiSerialDriver", "ProlificSerialDriver" };
	else
		driverNames = {""};

	// Get the current main activity of the application.
	QAndroidJniObject activity = QtAndroid::androidActivity();
	QAndroidJniObject usb_service = QAndroidJniObject::fromString("usb");
	QAndroidJniEnvironment env;

	// Get UsbManager from activity
	QAndroidJniObject usbManager = activity.callObjectMethod("getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;", QAndroidJniObject::fromString("usb").object());

	//UsbDevice[] arrayOfDevices = usbManager.getDeviceList().values().toArray();
	QAndroidJniObject deviceListHashMap = usbManager.callObjectMethod("getDeviceList","()Ljava/util/HashMap;");
	QAndroidJniObject deviceListCollection = deviceListHashMap.callObjectMethod("values", "()Ljava/util/Collection;");
	jint numDevices = deviceListCollection.callMethod<jint>("size");
	QAndroidJniObject arrayOfDevices = deviceListCollection.callObjectMethod("toArray", "()[Ljava/lang/Object;");

	// Special case to keep a generic user-facing name if only one device is present.
	if (numDevices == 1 && !driverSelection) {
		// UsbDevice usbDevice = arrayOfDevices[0]
		jobject value = env->GetObjectArrayElement(arrayOfDevices.object<jobjectArray>(), 0);
		QAndroidJniObject usbDevice(value);
		return std::vector<android_usb_serial_device_descriptor> { {QAndroidJniObject(usbDevice), "", "USB Connection"} };
	} else {
		std::vector<android_usb_serial_device_descriptor> retval;
		for (int i = 0; i < numDevices ; i++) {
			// UsbDevice usbDevice = arrayOfDevices[i]
			jobject value = env->GetObjectArrayElement(arrayOfDevices.object<jobjectArray>(), i);
			QAndroidJniObject usbDevice(value);

			// std::string deviceName = usbDevice.getDeviceName()
			QAndroidJniObject usbDeviceNameString = usbDevice.callObjectMethod<jstring>("getDeviceName");
			const char *charArray = env->GetStringUTFChars(usbDeviceNameString.object<jstring>(), nullptr);
			std::string deviceName(charArray);
			env->ReleaseStringUTFChars(usbDeviceNameString.object<jstring>(), charArray);

			// TODO the deviceName should probably be something better... Currently it's the /dev-filename.

			for (std::string driverName : driverNames) {
				std::string uiDeviceName;
				if (driverName != "")
					uiDeviceName = deviceName + " (" + driverName + ")";
				else
					uiDeviceName = deviceName + " (autoselect driver)";
				retval.push_back({QAndroidJniObject(usbDevice), driverName, uiDeviceName});
			}
		}
		return retval;
	}
}

/*
 * For testing and compatibility only, can be removed after the UI changes. Behaves exactly like the "old"
 * implementation if only one device is attached.
 */
dc_status_t serial_usb_android_open(dc_iostream_t **iostream, dc_context_t *context)
{
	std::vector<android_usb_serial_device_descriptor> devices = serial_usb_android_get_devices(false);

	if(devices.empty())
		return DC_STATUS_NODEVICE;

	return serial_usb_android_open(iostream, context, devices[0].usbDevice, devices[0].className);

}