RK Android7.1 禁用 USB触摸

 Android输入系统(6)——多点触摸处理

一.拔插usb触摸导致浏览器页面重新刷新

二.禁用触摸

2.1.\frameworks\native\services\inputflinger\EventHub.h 

/*
 * Input device classes.
 */
enum {
    /* The input device is a keyboard or has buttons. */
    INPUT_DEVICE_CLASS_KEYBOARD      = 0x00000001,

    /* The input device is an alpha-numeric keyboard (not just a dial pad). */
    INPUT_DEVICE_CLASS_ALPHAKEY      = 0x00000002,

    /* The input device is a touchscreen or a touchpad (either single-touch or multi-touch). */
    INPUT_DEVICE_CLASS_TOUCH         = 0x00000004,

    /* The input device is a cursor device such as a trackball or mouse. */
    INPUT_DEVICE_CLASS_CURSOR        = 0x00000008,

    /* The input device is a multi-touch touchscreen. */
    INPUT_DEVICE_CLASS_TOUCH_MT      = 0x00000010,

    /* The input device is a directional pad (implies keyboard, has DPAD keys). */
    INPUT_DEVICE_CLASS_DPAD          = 0x00000020,

    /* The input device is a gamepad (implies keyboard, has BUTTON keys). */
    INPUT_DEVICE_CLASS_GAMEPAD       = 0x00000040,

    /* The input device has switches. */
    INPUT_DEVICE_CLASS_SWITCH        = 0x00000080,

    /* The input device is a joystick (implies gamepad, has joystick absolute axes). */
    INPUT_DEVICE_CLASS_JOYSTICK      = 0x00000100,

    /* The input device has a vibrator (supports FF_RUMBLE). */
    INPUT_DEVICE_CLASS_VIBRATOR      = 0x00000200,
    /* The input device has a mouse. */
    INPUT_DEVICE_CLASS_KEYMOUSE      = 0x00000400,

    /* The input device has a microphone. */
    INPUT_DEVICE_CLASS_MIC           = 0x00000400,

    /* The input device is an external stylus (has data we want to fuse with touch data). */
    INPUT_DEVICE_CLASS_EXTERNAL_STYLUS = 0x00000800,

    /* The input device has a rotary encoder */
    INPUT_DEVICE_CLASS_ROTARY_ENCODER = 0x00001000,

    /* The input device is virtual (not a real device, not part of UI configuration). */
    INPUT_DEVICE_CLASS_VIRTUAL       = 0x40000000,

    /* The input device is external (not built-in). */
    INPUT_DEVICE_CLASS_EXTERNAL      = 0x80000000,
};

2.2.frameworks\native\services\inputflinger\EventHub.cpp  Mapper只处理一次 不能根据属性同步

触摸

--- a/frameworks/native/services/inputflinger/EventHub.cpp
+++ b/frameworks/native/services/inputflinger/EventHub.cpp
@@ -1199,7 +1199,10 @@ status_t EventHub::openDeviceLocked(const char *devicePath) {
                 device->classes |= INPUT_DEVICE_CLASS_ROTARY_ENCODER;
             }
     }
-
+	char  usb_touch [PROPERTY_VALUE_MAX];
+	int usb_touch_flag = 0;
+	property_get("persist.sys.UsbTouch", usb_touch, "0");
+	usb_touch_flag = strtol(usb_touch,0,0);
     // See if this is a touch pad.
     // Is this a new modern multi-touch driver?
     if (test_bit(ABS_MT_POSITION_X, device->absBitmask)
@@ -1208,13 +1211,21 @@ status_t EventHub::openDeviceLocked(const char *devicePath) {
         // with the ABS_MT range.  Try to confirm that the device really is
         // a touch screen.
         if (test_bit(BTN_TOUCH, device->keyBitmask) || !haveGamepadButtons) {
-            device->classes |= INPUT_DEVICE_CLASS_TOUCH | INPUT_DEVICE_CLASS_TOUCH_MT;
+            device->classes |= INPUT_DEVICE_CLASS_TOUCH | INPUT_DEVICE_CLASS_TOUCH_MT;	
+			if(usb_touch_flag){
+				ALOGD("gatsby INPUT_DEVICE_CLASS_TOUCH  INPUT_DEVICE_CLASS_TOUCH_MT");
+				return -1;
+			}			
         }
     // Is this an old style single-touch driver?
     } else if (test_bit(BTN_TOUCH, device->keyBitmask)
             && test_bit(ABS_X, device->absBitmask)
             && test_bit(ABS_Y, device->absBitmask)) {
-        device->classes |= INPUT_DEVICE_CLASS_TOUCH;
+        device->classes |= INPUT_DEVICE_CLASS_TOUCH;		
+		if(usb_touch_flag){
+			ALOGD("gatsby INPUT_DEVICE_CLASS_TOUCH");
+		    return -1;
+		}	
     // Is this a BT stylus?
     } else if ((test_bit(ABS_PRESSURE, device->absBitmask) ||
                 test_bit(BTN_TOUCH, device->keyBitmask))

 键盘

device->classes |= INPUT_DEVICE_CLASS_KEYBOARD | INPUT_DEVICE_CLASS_KEYMOUSE;

鼠标

device->classes |= INPUT_DEVICE_CLASS_CURSOR;　　

2.3.frameworks\native\services\inputflinger\InputReader.cpp 多点触摸屏处理函数 处理数据上报　　

--- a/frameworks/native/services/inputflinger/InputReader.cpp
+++ b/frameworks/native/services/inputflinger/InputReader.cpp
@@ -85,6 +85,9 @@ static const nsecs_t STYLUS_DATA_LATENCY = ms2ns(10);
 static const int KEYCODE_ENTER = 28;
 static const int KEYCODE_DPAD_CENTER = 232;
 
+static	char  usb_touch [PROPERTY_VALUE_MAX];
+static	int usb_touch_flag = 0;
+
 // --- Static Functions ---
 
 template<typename T>
@@ -1739,6 +1742,10 @@ void MultiTouchMotionAccumulator::clearSlots(int32_t initialSlot) {
 }
 
 void MultiTouchMotionAccumulator::process(const RawEvent* rawEvent) {
+	//ALOGD("gatsby MultiTouchMotionAccumulator");
+	property_get("persist.sys.UsbTouch", usb_touch, "0");
+	usb_touch_flag = strtol(usb_touch,0,0);
+if(usb_touch_flag){
     if (rawEvent->type == EV_ABS) {
         bool newSlot = false;
         if (mUsingSlotsProtocol) {
@@ -1821,6 +1828,7 @@ void MultiTouchMotionAccumulator::process(const RawEvent* rawEvent) {
         // MultiTouch Sync: The driver has returned all data for *one* of the pointers.
         mCurrentSlot += 1;
     }
+}	
 }