MTK-EngineeMode-Hardware Testing

在MTK-EngineeMode-Hardware Testing得LCM测试中点击TM Status后灭屏
硬件测屏幕结果是：背光关闭，屏未断电
要求我们看是否正常
在点击时会调用vendor/mediatek/proprietary/packages/apps/EngineerMode/src/com/mediatek/engineermode/lcm/EmDsenseLcmAssit.java中

public static int lcmSetTm(int tm) {Xlog.v(TAG, "-->LCMSetTm");return FB0_Fucntion(FB0_LCM_Set_Tm, tm);
}

这边会调用FB0_Fucntion方法

private static int FB0_Fucntion(int... param) {AFMFunctionCallEx A = new AFMFunctionCallEx();boolean result = A.startCallFunctionStringReturn(AFMFunctionCallEx.FUNCTION_EM_FB0_IOCTL);A.writeParamNo(param.length);for (int i : param) {A.writeParamInt(i);}if (!result) {return -1;}int valueRet = -1;FunctionReturn r;do {r = A.getNextResult();Xlog.v(TAG, "default result --returnString--" + r.mReturnString);if ("".equals(r.mReturnString)) {break;} else {if (r.mReturnString.equalsIgnoreCase("FFFFFFFF")) {valueRet = -1;break;}try {valueRet = Integer.valueOf(r.mReturnString);} catch (NumberFormatException e) {Xlog.d(TAG, e.getMessage());valueRet = -1;}}} while (r.mReturnCode == AFMFunctionCallEx.RESULT_CONTINUE);if (r.mReturnCode == AFMFunctionCallEx.RESULT_IO_ERR) {// errorreturn -1;} else {return valueRet;}}

首先会启动连接socket

boolean result = A.startCallFunctionStringReturn(AFMFunctionCallEx.FUNCTION_EM_FB0_IOCTL);

然后会将LCM得命令写入

for (int i : param) {A.writeParamInt(i);}

这边是通过socket进行通信，查看socket server相关代码最终会调到
vendor\mediatek\proprietary\packages\apps\engineermode\jni\server_em\ModuleFB0.cpp

static int LCMPowerOFF() {int fd = open("dev/graphics/fb0", O_RDWR, 0);if (fd < 0) {XLOGE("OPEN Failed");return -1;} else {// blank SurfaceFlingersp<SurfaceComposerClient> client = new SurfaceComposerClient();sp<IBinder> display = SurfaceComposerClient::getBuiltInDisplay(ISurfaceComposer::eDisplayIdMain);SurfaceComposerClient::setDisplayPowerMode(display, HWC_POWER_MODE_OFF);// turn off lcmint ret = -1;if (ioctl(fd, MTKFB_POWEROFF, &ret) == -1) {XLOGE("ioctl Failed");close(fd);return -1;}close(fd);return 0;}}

通过ioctl(fd, MTKFB_POWEROFF, &ret)操作"dev/graphics/fb0"这个驱动节点

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