Add UsbDeviceConnection.requestWait with a timeout (927fefe8) · Commits · e / os / android_frameworks_base

api/current.txt

+1 −0

Original line number	Diff line number	Diff line
		@@ -14778,6 +14778,7 @@ package android.hardware.usb {
		method public java.lang.String getSerial();
		method public boolean releaseInterface(android.hardware.usb.UsbInterface);
		method public android.hardware.usb.UsbRequest requestWait();
		method public android.hardware.usb.UsbRequest requestWait(int);
		method public boolean setConfiguration(android.hardware.usb.UsbConfiguration);
		method public boolean setInterface(android.hardware.usb.UsbInterface);
		}

api/system-current.txt

+1 −0

Original line number	Diff line number	Diff line
		@@ -15988,6 +15988,7 @@ package android.hardware.usb {
		method public java.lang.String getSerial();
		method public boolean releaseInterface(android.hardware.usb.UsbInterface);
		method public android.hardware.usb.UsbRequest requestWait();
		method public android.hardware.usb.UsbRequest requestWait(int);
		method public boolean resetDevice();
		method public boolean setConfiguration(android.hardware.usb.UsbConfiguration);
		method public boolean setInterface(android.hardware.usb.UsbInterface);

api/test-current.txt

+1 −0

Original line number	Diff line number	Diff line
		@@ -14795,6 +14795,7 @@ package android.hardware.usb {
		method public java.lang.String getSerial();
		method public boolean releaseInterface(android.hardware.usb.UsbInterface);
		method public android.hardware.usb.UsbRequest requestWait();
		method public android.hardware.usb.UsbRequest requestWait(int);
		method public boolean setConfiguration(android.hardware.usb.UsbConfiguration);
		method public boolean setInterface(android.hardware.usb.UsbInterface);
		}

core/java/android/hardware/usb/UsbDeviceConnection.java

+38 −2

Original line number	Diff line number	Diff line
		@@ -21,6 +21,9 @@ import android.annotation.Nullable;
		import android.annotation.SystemApi;
		import android.content.Context;
		import android.os.ParcelFileDescriptor;

		import com.android.internal.util.Preconditions;

		import dalvik.system.CloseGuard;

		import java.io.FileDescriptor;
		@@ -273,7 +276,40 @@ public class UsbDeviceConnection {
		* {@link UsbRequest#queue(ByteBuffer, int)}
		*/
		public UsbRequest requestWait() {
		UsbRequest request = native_request_wait();
		// -1 is special value indicating infinite wait
		UsbRequest request = native_request_wait(-1);
		if (request != null) {
		request.dequeue();
		}
		return request;
		}

		/**
		* Waits for the result of a {@link android.hardware.usb.UsbRequest#queue} operation
		* <p>Note that this may return requests queued on multiple
		* {@link android.hardware.usb.UsbEndpoint}s. When multiple endpoints are in use,
		* {@link android.hardware.usb.UsbRequest#getEndpoint} and {@link
		* android.hardware.usb.UsbRequest#getClientData} can be useful in determining how to process
		* the result of this function.</p>
		* <p>Position and array offset of the request's buffer are ignored and assumed to be 0. The
		* position will be set to the number of bytes read/written.</p>
		* <p>Android processes {@link UsbRequest UsbRequests} asynchronously. Hence it is not
		* guaranteed that {@link #requestWait(int) requestWait(0)} returns a request that has been
		* queued right before even if the request could have been processed immediately.</p>
		*
		* @param timeout timeout in milliseconds. If 0 this method does not wait.
		*
		* @return a completed USB request, or {@code null} if an error or time out occurred
		*
		* @throws IllegalArgumentException if the number of bytes read or written is more than the
		* limit of the request's buffer. The number of bytes is
		* determined by the {@code length} parameter of
		* {@link UsbRequest#queue(ByteBuffer, int)}
		*/
		public UsbRequest requestWait(int timeout) {
		timeout = Preconditions.checkArgumentNonnegative(timeout);

		UsbRequest request = native_request_wait(timeout);
		if (request != null) {
		request.dequeue();
		}
		@@ -318,7 +354,7 @@ public class UsbDeviceConnection {
		int index, byte[] buffer, int offset, int length, int timeout);
		private native int native_bulk_request(int endpoint, byte[] buffer,
		int offset, int length, int timeout);
		private native UsbRequest native_request_wait();
		private native UsbRequest native_request_wait(int timeout);
		private native String native_get_serial();
		private native boolean native_reset_device();
		}

core/jni/android_hardware_UsbDeviceConnection.cpp

+30 −5

Original line number	Diff line number	Diff line
		@@ -24,12 +24,15 @@

		#include <usbhost/usbhost.h>

		#include <chrono>

		#include <stdio.h>
		#include <sys/types.h>
		#include <sys/stat.h>
		#include <fcntl.h>

		using namespace android;
		using namespace std::chrono;

		static jfieldID field_context;

		@@ -215,7 +218,7 @@ android_hardware_UsbDeviceConnection_bulk_request(JNIEnv *env, jobject thiz,
		}

		static jobject
		android_hardware_UsbDeviceConnection_request_wait(JNIEnv *env, jobject thiz)
		android_hardware_UsbDeviceConnection_request_wait(JNIEnv *env, jobject thiz, jint timeoutMillis)
		{
		struct usb_device* device = get_device_from_object(env, thiz);
		if (!device) {
		@@ -223,12 +226,34 @@ android_hardware_UsbDeviceConnection_request_wait(JNIEnv *env, jobject thiz)
		return NULL;
		}

		struct usb_request* request = usb_request_wait(device);
		if (request)
		struct usb_request* request;
		if (timeoutMillis == -1) {
		request = usb_request_wait(device, -1);
		} else {
		steady_clock::time_point currentTime = steady_clock::now();
		steady_clock::time_point endTime = currentTime + std::chrono::milliseconds(timeoutMillis);

		// Poll the existence of a request via usb_request_wait until we get a result, an unexpected
		// error or time out. As several threads can listen on the same fd, we might get wakeups
		// without data.
		while (1) {
		request = usb_request_wait(device, duration_cast<std::chrono::milliseconds>(endTime
		- currentTime).count());

		int error = errno;
		currentTime = steady_clock::now();
		if (request != NULL \|\| error != EAGAIN \|\| currentTime >= endTime) {
		break;
		}
		};
		}

		if (request) {
		return (jobject)request->client_data;
		else
		} else {
		return NULL;
		}
		}

		static jstring
		android_hardware_UsbDeviceConnection_get_serial(JNIEnv *env, jobject thiz)
		@@ -272,7 +297,7 @@ static const JNINativeMethod method_table[] = {
		(void *)android_hardware_UsbDeviceConnection_control_request},
		{"native_bulk_request", "(I[BIII)I",
		(void *)android_hardware_UsbDeviceConnection_bulk_request},
		{"native_request_wait", "()Landroid/hardware/usb/UsbRequest;",
		{"native_request_wait", "(I)Landroid/hardware/usb/UsbRequest;",
		(void *)android_hardware_UsbDeviceConnection_request_wait},
		{ "native_get_serial", "()Ljava/lang/String;",
		(void*)android_hardware_UsbDeviceConnection_get_serial },