New Serial Manager API:

SerialManager: provides access to serial ports
SerialPort: for reading and writing data to and from serial ports

IO with both array based and direct ByteBuffers is supported.

Accessing serial ports requires android.permission.SERIAL_PORT permission

Each platform must configure list of supported serial ports in the
config_serialPorts resource overlay
(this is needed to prevent apps from accidentally accessing the bluetooth
or other system UARTs).

In addition, the platform uevent.rc file must set the owner to the
/dev/tty* files to "system" so the framework can access the port.

Signed-off-by: Mike Lockwood <lockwood@android.com>

3 files changed, 85 insertions, 0 deletions

diff --git a/services/jni/Android.mk b/services/jni/Android.mk
index 6fa5dfa..c63b84d 100644
--- a/services/jni/Android.mk
+++ b/services/jni/Android.mk
@@ -9,6 +9,7 @@ LOCAL_SRC_FILES:= \
     com_android_server_InputWindowHandle.cpp \
     com_android_server_LightsService.cpp \
     com_android_server_PowerManagerService.cpp \
+    com_android_server_SerialService.cpp \
     com_android_server_SystemServer.cpp \
     com_android_server_UsbDeviceManager.cpp \
     com_android_server_UsbHostManager.cpp \
diff --git a/services/jni/com_android_server_SerialService.cpp b/services/jni/com_android_server_SerialService.cpp
new file mode 100644
index 0000000..b889b78
--- /dev/null
+++ b/services/jni/com_android_server_SerialService.cpp
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2011 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.
+ */
+
+#define LOG_TAG "SerialServiceJNI"
+#include "utils/Log.h"
+
+#include "jni.h"
+#include "JNIHelp.h"
+#include "android_runtime/AndroidRuntime.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+namespace android
+{
+
+static struct parcel_file_descriptor_offsets_t
+{
+    jclass mClass;
+    jmethodID mConstructor;
+} gParcelFileDescriptorOffsets;
+
+static jobject android_server_SerialService_open(JNIEnv *env, jobject thiz, jstring path)
+{
+    const char *pathStr = env->GetStringUTFChars(path, NULL);
+
+    int fd = open(pathStr, O_RDWR | O_NOCTTY);
+    if (fd < 0) {
+        ALOGE("could not open %s", pathStr);
+        env->ReleaseStringUTFChars(path, pathStr);
+        return NULL;
+    }
+    env->ReleaseStringUTFChars(path, pathStr);
+
+    jobject fileDescriptor = jniCreateFileDescriptor(env, fd);
+    if (fileDescriptor == NULL) {
+        return NULL;
+    }
+    return env->NewObject(gParcelFileDescriptorOffsets.mClass,
+        gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
+}
+
+
+static JNINativeMethod method_table[] = {
+    { "native_open",                "(Ljava/lang/String;)Landroid/os/ParcelFileDescriptor;",
+                                    (void*)android_server_SerialService_open },
+};
+
+int register_android_server_SerialService(JNIEnv *env)
+{
+    jclass clazz = env->FindClass("com/android/server/SerialService");
+    if (clazz == NULL) {
+        ALOGE("Can't find com/android/server/SerialService");
+        return -1;
+    }
+
+    clazz = env->FindClass("android/os/ParcelFileDescriptor");
+    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
+    gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
+    gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>", "(Ljava/io/FileDescriptor;)V");
+    LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL,
+                 "Unable to find constructor for android.os.ParcelFileDescriptor");
+
+    return jniRegisterNativeMethods(env, "com/android/server/SerialService",
+            method_table, NELEM(method_table));
+}
+
+};
diff --git a/services/jni/onload.cpp b/services/jni/onload.cpp
index c7beb5f..423ebd1 100644
--- a/services/jni/onload.cpp
+++ b/services/jni/onload.cpp
@@ -27,6 +27,7 @@ int register_android_server_InputWindowHandle(JNIEnv* env);
 int register_android_server_InputManager(JNIEnv* env);
 int register_android_server_LightsService(JNIEnv* env);
 int register_android_server_PowerManagerService(JNIEnv* env);
+int register_android_server_SerialService(JNIEnv* env);
 int register_android_server_UsbDeviceManager(JNIEnv* env);
 int register_android_server_UsbHostManager(JNIEnv* env);
 int register_android_server_VibratorService(JNIEnv* env);
@@ -49,6 +50,7 @@ extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved)
     ALOG_ASSERT(env, "Could not retrieve the env!");
 
     register_android_server_PowerManagerService(env);
+    register_android_server_SerialService(env);
     register_android_server_InputApplicationHandle(env);
     register_android_server_InputWindowHandle(env);
     register_android_server_InputManager(env);