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Commit a88b42d5 authored by Mike Lockwood's avatar Mike Lockwood
Browse files

USB: Add method to access raw USB device descriptors 



Change-Id: Id5b46ede14a838198a59bdc8ed4732942044cfa8
Signed-off-by: default avatarMike Lockwood <lockwood@android.com>
parent b7ec3e41

api/current.xml

+11 −0
Original line number Diff line number Diff line
@@ -95449,6 +95449,17 @@ 
 visibility="public"

>

</method>

<method name="getRawDescriptors"

 return="byte[]"

 abstract="false"

 native="false"

 synchronized="false"

 static="false"

 final="false"

 deprecated="not deprecated"

 visibility="public"

>

</method>

<method name="getSerial"

 return="java.lang.String"

 abstract="false"

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

+12 −0
Original line number Diff line number Diff line
@@ -68,6 +68,17 @@ public class UsbDeviceConnection { 
        return native_get_fd();

    }



    /**

     * Returns the raw USB descriptors for the device.

     * This can be used to access descriptors not supported directly

     * via the higher level APIs.

     *

     * @return raw USB descriptors

     */

    public byte[] getRawDescriptors() {

        return native_get_desc();

    }



    /**

     * Claims exclusive access to a {@link android.hardware.usb.UsbInterface}.

     * This must be done before sending or receiving data on any
@@ -160,6 +171,7 @@ public class UsbDeviceConnection { 
    private native boolean native_open(String deviceName, FileDescriptor pfd);

    private native void native_close();

    private native int native_get_fd();

    private native byte[] native_get_desc();

    private native boolean native_claim_interface(int interfaceID, boolean force);

    private native boolean native_release_interface(int interfaceID);

    private native int native_control_request(int requestType, int request, int value,

core/jni/android_hardware_UsbDeviceConnection.cpp

+22 −0
Original line number Diff line number Diff line
@@ -83,6 +83,27 @@ android_hardware_UsbDeviceConnection_get_fd(JNIEnv *env, jobject thiz) 
    return usb_device_get_fd(device);

}



static jbyteArray

android_hardware_UsbDeviceConnection_get_desc(JNIEnv *env, jobject thiz)

{

    char buffer[16384];

    int fd = android_hardware_UsbDeviceConnection_get_fd(env, thiz);

    if (fd < 0) return NULL;

    lseek(fd, 0, SEEK_SET);

    int length = read(fd, buffer, sizeof(buffer));

    if (length < 0) return NULL;



    jbyteArray ret = env->NewByteArray(length);

    if (ret) {

        jbyte* bytes = (jbyte*)env->GetPrimitiveArrayCritical(ret, 0);

        if (bytes) {

            memcpy(bytes, buffer, length);

            env->ReleasePrimitiveArrayCritical(ret, bytes, 0);

        }

    }

    return ret;

}



static jboolean

android_hardware_UsbDeviceConnection_claim_interface(JNIEnv *env, jobject thiz,

        int interfaceID, jboolean force)
@@ -211,6 +232,7 @@ static JNINativeMethod method_table[] = { 
                                        (void *)android_hardware_UsbDeviceConnection_open},

    {"native_close",            "()V",  (void *)android_hardware_UsbDeviceConnection_close},

    {"native_get_fd",           "()I",  (void *)android_hardware_UsbDeviceConnection_get_fd},

    {"native_get_desc",         "()[B", (void *)android_hardware_UsbDeviceConnection_get_desc},

    {"native_claim_interface",  "(IZ)Z",(void *)android_hardware_UsbDeviceConnection_claim_interface},

    {"native_release_interface","(I)Z", (void *)android_hardware_UsbDeviceConnection_release_interface},

    {"native_control_request",  "(IIII[BII)I",