USB HID 设备
USB HID类是USB设备的一个标准设备类，包括的设备非常多。HID类设备定义它属于人机交互操作的设备，用于控制计算机操作的一些方面，如USB鼠标，USB键盘，USB游戏操纵杆，USB触摸屏。
USB HID设备的一个好处就是操作系统自带了HID类的驱动程序，而用户无需去开发驱动程序，只要使用API调用即可完成通信。
如何修改USB触控方向
diff --git a/frameworks/base/services/input/InputReader.cpp b/frameworks/base/services/input/InputReader.cpp
index 6a21d2a..068eb01 100755
--- a/frameworks/base/services/input/InputReader.cpp
+++ b/frameworks/base/services/input/InputReader.cpp
@@ -51,6 +51,7 @@
#include <errno.h>
#include <limits.h>
#include <math.h>
+#include <cutils/properties.h>
#define INDENT " "
#define INDENT2 " "
@@ -2947,7 +2948,31 @@ void TouchInputMapper::configureSurface(nsecs_t when, bool* outResetNeeded) {
bool viewportChanged = mViewport != newViewport;
if (viewportChanged) {
mViewport = newViewport;
-
+ //add by lixiaogang start
+ char tmp[PROP_VALUE_MAX];
+ property_get("ro.sf.rotation", tmp, 0);
+ int rotation = atoi(tmp);
+ if (rotation == 270) {
+ switch (mViewport.orientation) {
+ case DISPLAY_ORIENTATION_0:
+ ALOGD("mViewport.orientation = DISPLAY_ORIENTATION_0");
+ mViewport.orientation = DISPLAY_ORIENTATION_180;
+ break;
+ case DISPLAY_ORIENTATION_90:
+ ALOGD("mViewport.orientation = DISPLAY_ORIENTATION_90");
+ mViewport.orientation = DISPLAY_ORIENTATION_270;
+ break;
+ case DISPLAY_ORIENTATION_180:
+ ALOGD("mViewport.orientation = DISPLAY_ORIENTATION_180");
+ mViewport.orientation = DISPLAY_ORIENTATION_0;
+ break;
+ case DISPLAY_ORIENTATION_270:
+ ALOGD("mViewport.orientation = DISPLAY_ORIENTATION_270");
+ mViewport.orientation = DISPLAY_ORIENTATION_90;
+ break;
+ }
+ }
+ //add by lixiaogang end
if (mDeviceMode == DEVICE_MODE_DIRECT || mDeviceMode == DEVICE_MODE_POINTER) {
// Convert rotated viewport to natural surface coordinates.
int32_t naturalLogicalWidth, naturalLogicalHeight;
