2013年5月2日 星期四
Andorid HAL & system service testing / example code for TI AM335xevm JB BSP.
A. APP . "AndroInt_ext8_native"
We start from the demo apk. This apk is very simple , create two text input , and one button. Input the number at text_1 & text_2 , the button click will adding two numbers from each text, and show result on text of Button.
The IAndroIntServie is java interface , create by .aidl file in frameworks direct.
In this interface only have one function "AndroInt_add()".
So this using ServiceManage.getServie() to get system service.
This Service will implemnet in frameworks .
Now we go through to next step " modify frameworks ".
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/packages/apps/AndroInt_ext8_native/src/com/example/androInt_ext8_native/MainActivity.java TI-Android-JB-4.1.2_AM335x_4.0.1/packages/apps/AndroInt_ext8_native/src/com/example/androInt_ext8_native/MainActivity.java
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/packages/apps/AndroInt_ext8_native/src/com/example/androInt_ext8_native/MainActivity.java 1970-01-01 08:00:00.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/packages/apps/AndroInt_ext8_native/src/com/example/androInt_ext8_native/MainActivity.java 2013-05-02 16:58:39.860415713 +0800
@@ -0,0 +1,87 @@
+package com.example.androInt_ext8_native;
+
+import android.os.Bundle;
+import android.os.IBinder;
+import android.os.IAndroIntService;
+import android.os.ServiceManager;
+import android.os.RemoteException;
+
+//import android.os.Parcel;
+
+import android.util.Log;
+import android.view.Menu;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+import android.widget.EditText;
+import android.app.Activity;
+
+//import android.content.Context;
+
+
+public class MainActivity extends Activity implements OnClickListener
+{
+
+ private static final String TAG = "MainActivity";
+ private EditText mEditText2;
+ private EditText mEditText1;
+ private Button mButton;
+// private AndroIntService mAndroIntService = null ;
+
+ IAndroIntService om = IAndroIntService.Stub.asInterface(ServiceManager.getService("androint"));
+
+ @Override
+ protected void onCreate(Bundle savedInstanceState)
+ {
+ super.onCreate(savedInstanceState);
+ setContentView(R.layout.activity_main);
+
+ mEditText1 =(EditText) this.findViewById(R.id.editText1);
+ mEditText2 = (EditText) this.findViewById(R.id.editText2);
+ mButton = (Button) this.findViewById(R.id.button1);
+
+ mButton.setOnClickListener((android.view.View.OnClickListener) this);
+// mAndroIntService = new AndroIntService(this);
+
+ }
+
+ @Override
+ public boolean onCreateOptionsMenu(Menu menu)
+ {
+ // Inflate the menu; this adds items to the action bar if it is present.
+ getMenuInflater().inflate(R.menu.main, menu);
+ return true;
+ }
+
+
+ @Override
+ public void onClick(View v)
+ {
+ // TODO Auto-generated method stub
+ int result = 0 ;
+ int a = Integer.parseInt(mEditText1.getText().toString());
+ int b = Integer.parseInt(mEditText2.getText().toString());
+
+ Log.i(TAG, "a:" + a + " ,b:" + b );
+ Log.i(TAG, "om:" + om);
+
+ try
+ {
+// result = a + b ;
+ result = om.AndroInt_add(a, b);
+ Log.i(TAG, "result:" + result);
+ }
+ catch (RemoteException e)
+ {
+ // TODO Auto-generated catch block
+ Log.i(TAG, "Fail.... ");
+ }
+
+ mButton.setText(String.valueOf("A+B="+result ));
+
+ }
+
+}
+
+
+
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/packages/apps/AndroInt_ext8_native/Android.mk 1970-01-01 08:00:00.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/packages/apps/AndroInt_ext8_native/Android.mk 2013-05-02 11:22:09.705661044 +0800
@@ -0,0 +1,10 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_SRC_FILES := $(call all-java-files-under, src)
+
+LOCAL_PACKAGE_NAME := AndroInt_ext8_native
+
+include $(BUILD_PACKAGE)
B. Modify Frameworks .
1. Add new "IAndroIngService.aidl " into Android.mk file.
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/frameworks/base/Android.mk TI-Android-JB-4.1.2_AM335x_4.0.1/frameworks/base/Android.mk
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/frameworks/base/Android.mk 2012-12-17 15:18:22.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/frameworks/base/Android.mk 2013-04-30 16:25:22.118205204 +0800
@@ -126,6 +126,7 @@
core/java/android/nfc/INfcTag.aidl \
core/java/android/os/ICancellationSignal.aidl \
core/java/android/os/IHardwareService.aidl \
+ core/java/android/os/IAndroIntService.aidl \
core/java/android/os/IMessenger.aidl \
core/java/android/os/INetworkManagementService.aidl \
core/java/android/os/IPermissionController.aidl \
2.Caeate "IAndroIntService.aidl " file. This interface only have one function.
"AndroInt_add()"
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/frameworks/base/core/java/android/os/IAndroIntService.aidl TI-Android-JB-4.1.2_AM335x_4.0.1/frameworks/base/core/java/android/os/IAndroIntService.aidl
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/frameworks/base/core/java/android/os/IAndroIntService.aidl 1970-01-01 08:00:00.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/frameworks/base/core/java/android/os/IAndroIntService.aidl 2013-04-30 16:25:15.269146567 +0800
@@ -0,0 +1,32 @@
+/*
+ * IAndroIntService.aidl
+ *
+ * Copyright 2013 Jeff Hsieh <jeff@localhost.localdomain>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ *
+ *
+ */
+
+package android.os;
+
+/** {@hide} */
+interface IAndroIntService
+{
+ // obsolete flashlight support
+ int AndroInt_add(int a, int b);
+}
+
3.Implement AndroIntService.java file.
In this class , implement AndroInt_add(); function and
addService "androint" into system service.
In AndroInt_add() function , we call JNI function add_native().
The add_native() will access kernel driver.
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/frameworks/base/services/java/com/android/server/AndroIntService.java TI-Android-JB-4.1.2_AM335x_4.0.1/frameworks/base/services/java/com/android/server/AndroIntService.java
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/frameworks/base/services/java/com/android/server/AndroIntService.java 1970-01-01 08:00:00.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/frameworks/base/services/java/com/android/server/AndroIntService.java 2013-05-02 13:58:21.110380956 +0800
@@ -0,0 +1,75 @@
+/*
+ * AndroIntService.java
+ *
+ * Copyright 2013 Jeff Hsieh <jeff@localhost.localdomain>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ *
+ *
+ */
+
+
+package com.android.server;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.os.Handler;
+import android.os.IAndroIntService;
+import android.os.ServiceManager;
+import android.os.Message;
+import android.util.Slog;
+import android.util.Log;
+
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+
+public class AndroIntService
+{
+
+ private static final String LOG_TAG = "AndroIntService";
+
+ private static native int init_native();
+ private static native int add_native(int a,int b);
+
+ private final Context mContext;
+
+ AndroIntService(Context context)
+ {
+ Log.i(LOG_TAG, "AndroIntService.");
+ init_native();
+ mContext = context;
+
+ Log.i(LOG_TAG, "addService.");
+ ServiceManager.addService("androint", mAndroInt_Bind);
+ }
+
+ private final IAndroIntService.Stub mAndroInt_Bind = new IAndroIntService.Stub()
+ {
+ public int AndroInt_add(int a , int b)
+ {
+ int result;
+ Log.i(LOG_TAG, "mAndroInt_Bind.AndroInt_add.");
+ result = add_native(a,b);
+ return result;
+ }
+
+ };
+
+
+
+
+
+}
4.Modif SystemService.java file .
When system service started, lunch AndroIntService Class and then
add service "androint" into system service.
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/frameworks/base/services/java/com/android/server/SystemServer.java TI-Android-JB-4.1.2_AM335x_4.0.1/frameworks/base/services/java/com/android/server/SystemServer.java
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/frameworks/base/services/java/com/android/server/SystemServer.java 2012-12-17 15:18:57.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/frameworks/base/services/java/com/android/server/SystemServer.java 2013-05-02 12:41:16.244678767 +0800
@@ -117,6 +117,7 @@
AccountManagerService accountManager = null;
ContentService contentService = null;
LightsService lights = null;
+ AndroIntService mAndroIntService = null;
PowerManagerService power = null;
BatteryService battery = null;
VibratorService vibrator = null;
@@ -208,6 +209,9 @@
Slog.i(TAG, "Lights Service");
lights = new LightsService(context);
+ Slog.i(TAG, "Testing Service");
+ mAndroIntService = new AndroIntService(context);
+
Slog.i(TAG, "Battery Service");
battery = new BatteryService(context, lights);
ServiceManager.addService("battery", battery);
@@ -657,7 +661,7 @@
} catch (Throwable e) {
reportWtf("starting CertBlacklister", e);
}
-
+
if (context.getResources().getBoolean(
com.android.internal.R.bool.config_enableDreams)) {
try {
5.Add jni cpp file into Android.mk file.
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/frameworks/base/services/jni/Android.mk TI-Android-JB-4.1.2_AM335x_4.0.1/frameworks/base/services/jni/Android.mk
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/frameworks/base/services/jni/Android.mk 2012-12-17 15:18:57.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/frameworks/base/services/jni/Android.mk 2013-04-30 16:25:20.077187730 +0800
@@ -8,6 +8,7 @@
com_android_server_input_InputManagerService.cpp \
com_android_server_input_InputWindowHandle.cpp \
com_android_server_LightsService.cpp \
+ com_android_server_AndroIntService.cpp \
com_android_server_PowerManagerService.cpp \
com_android_server_SerialService.cpp \
com_android_server_SystemServer.cpp \
6.Implement com_android_server_AndroIntService.cpp file.
There have two JNI function.
add_native(): write data into kernle char driver. And do add in kernel driver,
then read result from kernel char driver.
init_native(): get HAL module device data , and open kernel char device.
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/frameworks/base/services/jni/com_android_server_AndroIntService.cpp TI-Android-JB-4.1.2_AM335x_4.0.1/frameworks/base/services/jni/com_android_server_AndroIntService.cpp
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/frameworks/base/services/jni/com_android_server_AndroIntService.cpp 1970-01-01 08:00:00.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/frameworks/base/services/jni/com_android_server_AndroIntService.cpp 2013-05-02 15:14:32.380259488 +0800
@@ -0,0 +1,98 @@
+/*
+ * com_android_server_AndroIntService.cpp
+ *
+ * Copyright 2013 Jeff Hsieh <jeff@localhost.localdomain>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ *
+ *
+ */
+
+
+#define LOG_TAG "AndroIntService_JNI"
+
+#include "jni.h"
+#include "JNIHelp.h"
+#include "android_runtime/AndroidRuntime.h"
+
+#include <utils/misc.h>
+#include <utils/Log.h>
+#include <hardware/hardware.h>
+#include <hardware/androint.h>
+
+#include <stdio.h>
+
+namespace android
+{
+static hw_module_t *module;
+static hw_device_t *device ;
+
+ static jint add_native(JNIEnv *env, jobject clazz,int a , int b)
+ {
+ int result;
+ struct androint_device_t *int_dev;
+
+ ALOGI("[%s]:%d \n",__FUNCTION__,__LINE__);
+ if ( device == NULL )
+ {
+ ALOGI("[%s]:%d:Device is null \n",__FUNCTION__,__LINE__);
+ return (jint)-1;
+ }
+ else
+ {
+ int_dev = (struct androint_device_t *)device;
+ int_dev->write_add(int_dev,a,b);
+ result = int_dev->read_add(int_dev);
+ ALOGI("[%s]:%d \n",__FUNCTION__,__LINE__);
+
+ }
+ return (jint)result;
+ }
+
+ static jint init_native(JNIEnv *env, jobject clazz)
+ {
+ int err;
+
+ ALOGI("[%s]:%d \n",__FUNCTION__,__LINE__);
+ err = hw_get_module(ANDROINT_HARDWARE_MODULE_ID, (hw_module_t const**)&module);
+ if (err == 0)
+ {
+ err = module->methods->open(module, ANDROINT_HARDWARE_MODULE_ID, &device);
+ ALOGI("get module success! \n" );
+ }
+ else
+ {
+ device = NULL;
+ ALOGI("get module fail:%d! \n",err );
+ }
+
+ return (jint)err;
+ }
+
+ static JNINativeMethod method_table[] =
+ {
+ { "add_native", "(II)I", (void*)add_native },
+ { "init_native", "()I", (void*)init_native },
+ };
+
+ int register_android_server_AndroIntService(JNIEnv *env)
+ {
+ ALOGI("[%s]:%d \n",__FUNCTION__,__LINE__);
+ return jniRegisterNativeMethods(env, "com/android/server/AndroIntService",
+ method_table, NELEM(method_table));
+ }
+
+};
7.Modify onload.cpp file .
when system load .so module file. the "JNI_OnLoad" is first doing function.
In this function , we so register Natiye Metheods .
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/frameworks/base/services/jni/onload.cpp TI-Android-JB-4.1.2_AM335x_4.0.1/frameworks/base/services/jni/onload.cpp
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/frameworks/base/services/jni/onload.cpp 2012-12-17 15:18:57.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/frameworks/base/services/jni/onload.cpp 2013-04-30 19:31:08.255261707 +0800
@@ -19,6 +19,8 @@
#include "utils/Log.h"
#include "utils/misc.h"
+#define LOG_TAG "onload"
+
namespace android {
int register_android_server_AlarmManagerService(JNIEnv* env);
int register_android_server_BatteryService(JNIEnv* env);
@@ -34,6 +36,9 @@
int register_android_server_SystemServer(JNIEnv* env);
int register_android_server_location_GpsLocationProvider(JNIEnv* env);
int register_android_server_connectivity_Vpn(JNIEnv* env);
+
+int register_android_server_AndroIntService(JNIEnv* env);
+
};
using namespace android;
@@ -64,5 +69,8 @@
register_android_server_location_GpsLocationProvider(env);
register_android_server_connectivity_Vpn(env);
+ ALOGI("register_android_server_AndroIntService...... ");
+ register_android_server_AndroIntService(env);
+
return JNI_VERSION_1_4;
}
C. Hard device side (HAL)
1. Create androint.h file.
In this file , define driver using stauct , called "androint_device_t"
And define HARDWARE_MODULE_ID "androint"
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/hardware/libhardware/include/hardware/androint.h TI-Android-JB-4.1.2_AM335x_4.0.1/hardware/libhardware/include/hardware/androint.h
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/hardware/libhardware/include/hardware/androint.h 1970-01-01 08:00:00.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/hardware/libhardware/include/hardware/androint.h 2013-05-02 14:36:20.091463495 +0800
@@ -0,0 +1,54 @@
+/*
+ * androint.h
+ *
+ * Copyright 2013 Jeff Hsieh <jeff@localhost.localdomain>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ *
+ *
+ */
+
+#ifndef ANDROIDINT_INTERFACE_H
+#define ANDROIDINT_INTERFACE_H
+
+#include <stdint.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#include <hardware/hardware.h>
+
+__BEGIN_DECLS
+
+/**
+ * The id of this module
+ */
+#define ANDROINT_HARDWARE_MODULE_ID "androint"
+
+struct androint_device_t
+{
+ struct hw_device_t hw_dev;
+
+ int fd;
+ int (*write_add)(struct androint_device_t* dev,int a , int b );
+ int (*read_add)(struct androint_device_t* dev);
+};
+
+
+
+__END_DECLS
+
+#endif // ANDROID_LIGHTS_INTERFACE_H
+
2. Modify am335xevm_sd.mk file .
Add androin.$(TARGET_PRODUCE) .
### importent ###
androin.$(TARGET_PRODUCE) .
must same as HARDWARE_MODULE_ID
the HAL hw_get_module() will searce /system/lib/hw/ <id.product.board>
the id is HARDWARE_MODULE_ID.
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/device/ti/am335xevm_sk/am335xevm_sk.mk TI-Android-JB-4.1.2_AM335x_4.0.1/device/ti/am335xevm_sk/am335xevm_sk.mk
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/device/ti/am335xevm_sk/am335xevm_sk.mk 2012-12-17 15:17:46.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/device/ti/am335xevm_sk/am335xevm_sk.mk 2013-05-02 16:42:49.562787996 +0800
@@ -28,7 +28,8 @@
MagicSmokeWallpapers \
VisualizationWallpapers \
librs_jni \
- lights.$(TARGET_PRODUCT)
+ lights.$(TARGET_PRODUCT) \
+ androint.$(TARGET_PRODUCT)
PRODUCT_PROPERTY_OVERRIDES := \
net.dns1=8.8.8.8 \
3.Modify device.mk file .
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/device/ti/am335xevm_sk/device.mk TI-Android-JB-4.1.2_AM335x_4.0.1/device/ti/am335xevm_sk/device.mk
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/device/ti/am335xevm_sk/device.mk 2012-12-17 15:17:46.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/device/ti/am335xevm_sk/device.mk 2013-05-02 16:42:51.695805279 +0800
@@ -112,6 +112,9 @@
hcitool
PRODUCT_PACKAGES += \
+ androint.am335xevm_sk
+
+PRODUCT_PACKAGES += \
lights.am335xevm_sk
PRODUCT_PACKAGES += \
4.Implement add.c file.
This file is driver access function.
open_add(): open device file of /dev/xxxxx . and setting read_add / write_add
function point into androint_device_t struct.
write_add()/read_add() : Direct access kernel device .
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/device/ti/am335xevm_sk/libintadd/add.c TI-Android-JB-4.1.2_AM335x_4.0.1/device/ti/am335xevm_sk/libintadd/add.c
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/device/ti/am335xevm_sk/libintadd/add.c 1970-01-01 08:00:00.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/device/ti/am335xevm_sk/libintadd/add.c 2013-05-02 16:46:04.784374408 +0800
@@ -0,0 +1,161 @@
+/*
+ * add.c
+ *
+ * Copyright 2013 Jeff Hsieh <jeff@localhost.localdomain>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ *
+ *
+ */
+
+
+#define LOG_TAG "HAL_add"
+
+#include <cutils/log.h>
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+
+#include <sys/ioctl.h>
+#include <sys/types.h>
+
+#include <hardware/androint.h>
+
+
+#define DEVFILE "/dev/androint-1"
+
+
+static pthread_once_t g_init = PTHREAD_ONCE_INIT;
+static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
+
+static void init_globals(void)
+{
+ /* init the mutex */
+ pthread_mutex_init(&g_lock, NULL);
+}
+
+static int write_add(struct androint_device_t *dev, int a , int b )
+{
+int err;
+int buf[2];
+
+ ALOGI("Device:%s not open !!\n", DEVFILE);
+ err = -1;
+ if (dev->fd < 0 )
+ {
+ ALOGI("Device:%s not open !!\n", DEVFILE);
+ return err ;
+ }
+ pthread_mutex_lock(&g_lock);
+
+ buf[0] = a;
+ buf[1] = b;
+
+ err = write(dev->fd,buf,sizeof(int)*2);
+
+ pthread_mutex_unlock(&g_lock);
+
+ return err ;
+
+}
+
+static int read_add(struct androint_device_t* dev)
+{
+int err;
+int result;
+
+ err = -1;
+ if (dev->fd < 0 )
+ {
+ ALOGI("Device:%s not open !!\n", DEVFILE);
+ return err ;
+ }
+
+ pthread_mutex_lock(&g_lock);
+
+ read(dev->fd, &result,sizeof(int));
+
+ pthread_mutex_unlock(&g_lock);
+
+ return result;
+}
+
+static int close_add(struct androint_device_t *dev)
+{
+int err;
+ err = -1;
+ if (dev->fd > 0 )
+ {
+ ALOGI("Close %s\n", DEVFILE);
+ close(dev->fd);
+ dev->fd = -1 ;
+ err = 0;
+ }
+
+ return err;
+}
+
+static int open_add(const struct hw_module_t *module, char const *name, struct hw_device_t **device)
+{
+struct androint_device_t *dev;
+
+ pthread_once(&g_init, init_globals);
+
+ dev = malloc(sizeof(struct androint_device_t));
+ memset(dev, 0, sizeof(*dev));
+
+ dev->hw_dev.tag = HARDWARE_DEVICE_TAG;
+ dev->hw_dev.version = 0;
+ dev->hw_dev.module = (struct hw_module_t *)module;
+ dev->hw_dev.close = (int (*)(struct hw_device_t *))close_add;
+
+ dev->fd = open(DEVFILE,O_RDWR);
+ dev->write_add = write_add;
+ dev->read_add = read_add;
+
+
+ ALOGI("Open %s\n", DEVFILE);
+
+ *device = (struct hw_device_t *)dev;
+
+ return 0;
+}
+
+static struct hw_module_methods_t add_module_methods =
+{
+ .open = open_add,
+};
+
+struct hw_module_t HAL_MODULE_INFO_SYM =
+{
+ .tag = HARDWARE_MODULE_TAG,
+ .version_major = 1,
+ .version_minor = 0,
+ .id = ANDROINT_HARDWARE_MODULE_ID,
+ .name = "Instant testing Module",
+ .author = "Instant, Inc.",
+ .methods = &add_module_methods,
+};
+
+
+
+
+
5.Create Andorid.mk file for build add.c .
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/device/ti/am335xevm_sk/libintadd/Android.mk TI-Android-JB-4.1.2_AM335x_4.0.1/device/ti/am335xevm_sk/libintadd/Android.mk
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/device/ti/am335xevm_sk/libintadd/Android.mk 1970-01-01 08:00:00.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/device/ti/am335xevm_sk/libintadd/Android.mk 2013-05-02 16:58:00.966105273 +0800
@@ -0,0 +1,40 @@
+# Android.mk
+#
+# Copyright 2013 Jeff Hsieh <jeff@localhost.localdomain>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+# MA 02110-1301, USA.
+#
+#
+
+LOCAL_PATH:= $(call my-dir)
+
+ifeq ($(TARGET_PRODUCT),am335xevm_sk)
+# HAL module implemenation, not prelinked and stored in
+# hw/<COPYPIX_HARDWARE_MODULE_ID>.<ro.board.platform>.so
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := add.c
+
+LOCAL_PRELINK_MODULE := false
+LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
+
+LOCAL_SHARED_LIBRARIES := liblog
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE := androint.$(TARGET_PRODUCT)
+
+include $(BUILD_SHARED_LIBRARY)
+
+endif
6.Modify init.am335xevm.rc file . to insmod kernel driver .ko file.
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/device/ti/am335xevm_sk/init.am335xevm.rc TI-Android-JB-4.1.2_AM335x_4.0.1/device/ti/am335xevm_sk/init.am335xevm.rc
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/device/ti/am335xevm_sk/init.am335xevm.rc 2012-12-17 15:17:46.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/device/ti/am335xevm_sk/init.am335xevm.rc 2013-05-02 15:02:15.438483092 +0800
@@ -43,6 +43,8 @@
insmod /system/lib/modules/cfg80211.ko
insmod /system/lib/modules/mac80211.ko
insmod /system/lib/modules/wl12xx.ko
+ insmod /system/lib/modules/androint_module.ko
+
on fs
# Backlight
7.Modify uevnetd.am335xevm.rc file.
Change /dev/xxxxx group and owner.
diff -Nura TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/device/ti/am335xevm_sk/ueventd.am335xevm.rc TI-Android-JB-4.1.2_AM335x_4.0.1/device/ti/am335xevm_sk/ueventd.am335xevm.rc
--- TI-Android-JB-4.1.2_AM335x_4.0.1-orignal/device/ti/am335xevm_sk/ueventd.am335xevm.rc 2012-12-17 15:17:46.000000000 +0800
+++ TI-Android-JB-4.1.2_AM335x_4.0.1/device/ti/am335xevm_sk/ueventd.am335xevm.rc 2013-05-02 15:04:22.641516874 +0800
@@ -1 +1,2 @@
/dev/video0 0666 root root
+/dev/androint-1 0660 system system
D. Kernel Dirver
I am lazy to explain it, if have some question please contact me.
1.Makefile
# ./kernel/hardware/driver_test/Makefile
#
# vi: set ts=4 :
##=======================================
## Setting Compiler FLAGS.
##=======================================
export CFLAGS :=
export CPPFLAGS :=
export LDFLAGS :=
##==========================================
## Specital Make Rules.
##==========================================
KERNELDIR ?= $(PRJ_KERNEL_DIR)/_version
PWD := $(shell pwd)
ifeq ($(KERNELRELEASE),)
all:
@if [ -L '$(KERNELDIR)' ] ;then \
INSTALL_MOD_PATH=$(PRJ_IMG_DIR) $(MAKE) -C $(KERNELDIR) M=$(PWD) LDDINC=$(PWD) modules modules_install ;\
else \
$(MKMATE) color -fred "## Unknow kernel dir '$(KERNELDIR)', Please build kernel first...." ; \
exit 1 ; \
fi
distclean clean:
@rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions [mM]odule*
else
obj-m := androint_module.o
endif
2.Driver code.
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#define DEV_MAJOR 48
#define DEV_NAME "androint"
struct androint_dev
{
int data[2];
struct cdev cdev;
struct class *sysfs_class;
dev_t dev_num;
};
struct androint_dev androint_device;
ssize_t androint_read(struct file *filp, char *buf, size_t count, loff_t *f_pos)
{
ssize_t retval;
int sum ;
retval = 0;
sum = androint_device.data[0] + androint_device.data[1];
if (count != sizeof (int))
{
printk(KERN_INFO "Read error: buffer size not same !\n");
goto out;
}
retval = copy_to_user(buf,&sum , sizeof(int));
if ( retval)
retval = -EFAULT;
out:
return retval;
}
ssize_t androint_write(struct file *filp, const char *buf, size_t count,
loff_t *f_pos)
{
ssize_t retval;
retval = 0;
if (count != sizeof(int) * 2 )
{
printk(KERN_INFO "Write error: buffer size not same !\n");
goto out;
}
retval = copy_from_user(androint_device.data , buf, count);
if ( retval)
retval = -EFAULT;
out:
return retval;
}
int androint_open(struct inode *inode, struct file *filp)
{
int num = MINOR(inode->i_rdev);
printk("androint_open -> minor : %d\n", num);
return 0;
}
int androint_release(struct inode *inode, struct file *filp)
{
printk("androint_release \n");
return 0;
}
struct file_operations androint_fops =
{
.owner = THIS_MODULE,
.read = androint_read,
.write = androint_write,
.open = androint_open,
.release = androint_release,
};
static int __init androint_init(void)
{
int result;
printk(KERN_INFO "Module inti starts !\n");
androint_device.dev_num = MKDEV(DEV_MAJOR,0);
result = register_chrdev_region(androint_device.dev_num,1, DEV_NAME);
if (result < 0)
{
printk( KERN_ALERT "androint: cannot register device region of %s\n",DEV_NAME);
return result;
}
cdev_init(&androint_device.cdev, &androint_fops);
androint_device.cdev.owner = THIS_MODULE;
result = cdev_add(&androint_device.cdev,androint_device.dev_num,1);
if (result)
{
printk(KERN_INFO "Can not add device %s \n ", DEV_NAME);
goto fail_addcdev;
}
// populate sysfs entry
androint_device.sysfs_class = class_create(THIS_MODULE, DEV_NAME);
device_create(androint_device.sysfs_class, NULL,
androint_device.dev_num, NULL, DEV_NAME"-%d", 1);
printk(KERN_INFO "Module inti done !\n");
fail_addcdev:
unregister_chrdev_region(androint_device.dev_num,1);
return result;
}
void androint_exit(void)
{
// remove the cdev
cdev_del(&androint_device.cdev);
// Freeing the major number
unregister_chrdev_region(androint_device.dev_num, 1);
device_destroy(androint_device.sysfs_class, androint_device.dev_num);
class_destroy(androint_device.sysfs_class);
printk(KERN_INFO "Module release done !\n");
}
module_init(androint_init);
module_exit(androint_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Instnat");
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