From 6010dafe066e4b04e7f64820a010b8f4e9e1c719 Mon Sep 17 00:00:00 2001
From: Mike Lockwood <lockwood@android.com>
Date: Fri, 23 Sep 2011 11:43:42 -0400
Subject: [PATCH] Add SerialPort.sendBreak()

Change-Id: If25ba7724cf69489f2b04fc995baa9c164b5ea58
Signed-off-by: Mike Lockwood <lockwood@android.com>
---
 api/current.txt                            | 1 +
 core/java/android/hardware/SerialPort.java | 8 ++++++++
 core/jni/android_hardware_SerialPort.cpp   | 8 ++++++++
 3 files changed, 17 insertions(+)

diff --git a/api/current.txt b/api/current.txt
index a8265fc38ebf4..70dad79aef63c 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -9614,6 +9614,7 @@ package android.hardware {
     method public void close() throws java.io.IOException;
     method public java.lang.String getName();
     method public int read(java.nio.ByteBuffer) throws java.io.IOException;
+    method public void sendBreak();
     method public void write(java.nio.ByteBuffer, int) throws java.io.IOException;
   }
 
diff --git a/core/java/android/hardware/SerialPort.java b/core/java/android/hardware/SerialPort.java
index 5aee0f69cf90a..d3bcbdd0c1006 100644
--- a/core/java/android/hardware/SerialPort.java
+++ b/core/java/android/hardware/SerialPort.java
@@ -113,10 +113,18 @@ public class SerialPort {
         }
     }
 
+    /**
+     * Sends a stream of zero valued bits for 0.25 to 0.5 seconds
+     */
+    public void sendBreak() {
+        native_send_break();
+    }
+
     private native void native_open(FileDescriptor pfd, int speed) throws IOException;
     private native void native_close();
     private native int native_read_array(byte[] buffer, int length) throws IOException;
     private native int native_read_direct(ByteBuffer buffer, int length) throws IOException;
     private native void native_write_array(byte[] buffer, int length) throws IOException;
     private native void native_write_direct(ByteBuffer buffer, int length) throws IOException;
+    private native void native_send_break();
 }
diff --git a/core/jni/android_hardware_SerialPort.cpp b/core/jni/android_hardware_SerialPort.cpp
index 792211595f2d7..728bd7bfe3f81 100644
--- a/core/jni/android_hardware_SerialPort.cpp
+++ b/core/jni/android_hardware_SerialPort.cpp
@@ -234,6 +234,13 @@ android_hardware_SerialPort_write_direct(JNIEnv *env, jobject thiz, jobject buff
         jniThrowException(env, "java/io/IOException", NULL);
 }
 
+static void
+android_hardware_SerialPort_send_break(JNIEnv *env, jobject thiz)
+{
+    int fd = env->GetIntField(thiz, field_context);
+    tcsendbreak(fd, 0);
+}
+
 static JNINativeMethod method_table[] = {
     {"native_open",             "(Ljava/io/FileDescriptor;I)V",
                                         (void *)android_hardware_SerialPort_open},
@@ -246,6 +253,7 @@ static JNINativeMethod method_table[] = {
                                         (void *)android_hardware_SerialPort_write_array},
     {"native_write_direct",     "(Ljava/nio/ByteBuffer;I)V",
                                         (void *)android_hardware_SerialPort_write_direct},
+    {"native_send_break",       "()V",  (void *)android_hardware_SerialPort_send_break},
 };
 
 int register_android_hardware_SerialPort(JNIEnv *env)