Android 11添加电容笔电量监测需求

软件平台：Android11

硬件平台：QCS6125

    需求：PAD接入电容笔，该笔通过驱动上报坐标及当前电量等数据，即走系统的input通道，需要系统层监测到该硬件数据，这里主要展示电量，对用户显示提醒。

基本实现思路：通过在InputManager的本地层注册监听回调，实现监测的目的。

    直接上代码改动：

1、input的native层面改动frameworks/native：

diff --git a/services/inputflinger/InputListener.cpp b/services/inputflinger/InputListener.cpp
index 84838ec8a..7b900e758 100644
--- a/services/inputflinger/InputListener.cpp
+++ b/services/inputflinger/InputListener.cpp
@@ -102,7 +102,8 @@ NotifyMotionArgs::NotifyMotionArgs(int32_t id, nsecs_t eventTime, int32_t device
                                    const PointerCoords* pointerCoords, float xPrecision,
                                    float yPrecision, float xCursorPosition, float yCursorPosition,
                                    nsecs_t downTime,
-                                   const std::vector<TouchVideoFrame>& videoFrames)
+                                   const std::vector<TouchVideoFrame>& videoFrames,
+                                   uint32_t penBattery)
       : NotifyArgs(id, eventTime),
         deviceId(deviceId),
         source(source),
@@ -121,7 +122,8 @@ NotifyMotionArgs::NotifyMotionArgs(int32_t id, nsecs_t eventTime, int32_t device
         xCursorPosition(xCursorPosition),
         yCursorPosition(yCursorPosition),
         downTime(downTime),
-        videoFrames(videoFrames) {
+        videoFrames(videoFrames),
+        penBattery(penBattery) {
     for (uint32_t i = 0; i < pointerCount; i++) {
         this->pointerProperties[i].copyFrom(pointerProperties[i]);
         this->pointerCoords[i].copyFrom(pointerCoords[i]);
@@ -147,7 +149,8 @@ NotifyMotionArgs::NotifyMotionArgs(const NotifyMotionArgs& other)
         xCursorPosition(other.xCursorPosition),
         yCursorPosition(other.yCursorPosition),
         downTime(other.downTime),
-        videoFrames(other.videoFrames) {
+        videoFrames(other.videoFrames),
+        penBattery(other.penBattery) {
     for (uint32_t i = 0; i < pointerCount; i++) {
         pointerProperties[i].copyFrom(other.pointerProperties[i]);
         pointerCoords[i].copyFrom(other.pointerCoords[i]);
diff --git a/services/inputflinger/dispatcher/InputDispatcher.cpp b/services/inputflinger/dispatcher/InputDispatcher.cpp
index fe016af01..f86178917 100644
--- a/services/inputflinger/dispatcher/InputDispatcher.cpp
+++ b/services/inputflinger/dispatcher/InputDispatcher.cpp
@@ -3155,11 +3155,11 @@ void InputDispatcher::notifyMotion(const NotifyMotionArgs* args) {
           "displayId=%" PRId32 ", policyFlags=0x%x, "
           "action=0x%x, actionButton=0x%x, flags=0x%x, metaState=0x%x, buttonState=0x%x, "
           "edgeFlags=0x%x, xPrecision=%f, yPrecision=%f, xCursorPosition=%f, "
-          "yCursorPosition=%f, downTime=%" PRId64,
+          "yCursorPosition=%f, penBattery=%d, downTime=%" PRId64,
           args->id, args->eventTime, args->deviceId, args->source, args->displayId,
           args->policyFlags, args->action, args->actionButton, args->flags, args->metaState,
           args->buttonState, args->edgeFlags, args->xPrecision, args->yPrecision,
-          args->xCursorPosition, args->yCursorPosition, args->downTime);
+          args->xCursorPosition, args->yCursorPosition, args->penBattery, args->downTime);
     for (uint32_t i = 0; i < args->pointerCount; i++) {
         ALOGD("  Pointer %d: id=%d, toolType=%d, "
               "x=%f, y=%f, pressure=%f, size=%f, "
@@ -3192,6 +3192,20 @@ void InputDispatcher::notifyMotion(const NotifyMotionArgs* args) {
               std::to_string(t.duration().count()).c_str());
     }
 
+    if (args->action == AMOTION_EVENT_ACTION_DOWN) {
+        uint32_t penBattery = args->penBattery;
+        if (PEN_BATTERY_MIN <= penBattery && penBattery <= PEN_BATTERY_MAX) {
+            ALOGD("reportPenBattery # penBattery:%d", penBattery);
+
+            android::base::Timer timer;
+            mPolicy->reportPenBattery(args->displayId, args->eventTime, penBattery);
+            if (timer.duration() > SLOW_INTERCEPTION_THRESHOLD) {
+                ALOGW("Excessive delay in reportPenBattery; took %s ms",
+                      std::to_string(timer.duration().count()).c_str());
+            }
+        }
+    }
+
     bool needWake;
     { // acquire lock
         mLock.lock();
diff --git a/services/inputflinger/dispatcher/include/InputDispatcherPolicyInterface.h b/services/inputflinger/dispatcher/include/InputDispatcherPolicyInterface.h
index 667af9bbd..cb9b930f1 100644
--- a/services/inputflinger/dispatcher/include/InputDispatcherPolicyInterface.h
+++ b/services/inputflinger/dispatcher/include/InputDispatcherPolicyInterface.h
@@ -83,6 +83,9 @@ public:
     virtual void interceptMotionBeforeQueueing(const int32_t displayId, nsecs_t when,
                                                uint32_t& policyFlags) = 0;
 
+    /* 上报主动笔的电量 */
+    virtual void reportPenBattery(const int32_t displayId, nsecs_t when, uint32_t penBattery) {}
+
     /* Allows the policy a chance to intercept a key before dispatching. */
     virtual nsecs_t interceptKeyBeforeDispatching(const sp<IBinder>& token,
                                                   const KeyEvent* keyEvent,
diff --git a/services/inputflinger/include/InputListener.h b/services/inputflinger/include/InputListener.h
index 8317b051e..c54830aa8 100644
--- a/services/inputflinger/include/InputListener.h
+++ b/services/inputflinger/include/InputListener.h
@@ -23,6 +23,14 @@
 #include <input/TouchVideoFrame.h>
 #include <utils/RefBase.h>
 
+// 主动笔电量值范围
+#define PEN_BATTERY_UNKNOWN 255
+#define PEN_BATTERY_MIN     0
+#define PEN_BATTERY_MAX     100
+
+// 主动笔电量值的 input-event-code
+#define ABS_PEN_BATT        0x1d
+
 namespace android {
 
 class InputListenerInterface;
@@ -121,6 +129,9 @@ struct NotifyMotionArgs : public NotifyArgs {
     nsecs_t downTime;
     std::vector<TouchVideoFrame> videoFrames;
 
+    // 主动笔电量值
+    uint32_t penBattery;
+
     inline NotifyMotionArgs() { }
 
     NotifyMotionArgs(int32_t id, nsecs_t eventTime, int32_t deviceId, uint32_t source,
@@ -130,7 +141,8 @@ struct NotifyMotionArgs : public NotifyArgs {
                      const PointerProperties* pointerProperties, const PointerCoords* pointerCoords,
                      float xPrecision, float yPrecision, float xCursorPosition,
                      float yCursorPosition, nsecs_t downTime,
-                     const std::vector<TouchVideoFrame>& videoFrames);
+                     const std::vector<TouchVideoFrame>& videoFrames,
+                     uint32_t penBattery = PEN_BATTERY_UNKNOWN);
 
     NotifyMotionArgs(const NotifyMotionArgs& other);
 
diff --git a/services/inputflinger/reader/mapper/TouchInputMapper.cpp b/services/inputflinger/reader/mapper/TouchInputMapper.cpp
index decbea4c3..2445fcf0f 100644
--- a/services/inputflinger/reader/mapper/TouchInputMapper.cpp
+++ b/services/inputflinger/reader/mapper/TouchInputMapper.cpp
@@ -1407,6 +1407,13 @@ void TouchInputMapper::process(const RawEvent* rawEvent) {
     mCursorScrollAccumulator.process(rawEvent);
     mTouchButtonAccumulator.process(rawEvent);
 
+    if (rawEvent->type == EV_ABS && rawEvent->code == ABS_PEN_BATT) {
+        mPenBattery = rawEvent->value;
+        if (mPenBattery < PEN_BATTERY_MIN || mP