diff --git a/cmds/keystore/keystore.cpp b/cmds/keystore/keystore.cpp
index 31db9fd..b48be6e 100644
--- a/cmds/keystore/keystore.cpp
+++ b/cmds/keystore/keystore.cpp
@@ -392,9 +392,7 @@
             return false;
         }
         while ((file = readdir(dir)) != NULL) {
-            if (isKeyFile(file->d_name)) {
-                unlink(file->d_name);
-            }
+            unlink(file->d_name);
         }
         closedir(dir);
         return true;
diff --git a/include/ui/Input.h b/include/ui/Input.h
index ba1c6b4..c9f694a 100644
--- a/include/ui/Input.h
+++ b/include/ui/Input.h
@@ -655,11 +655,6 @@
     // Oldest sample to consider when calculating the velocity.
     static const nsecs_t MAX_AGE = 200 * 1000000; // 200 ms
 
-    // When the total duration of the window of samples being averaged is less
-    // than the window size, the resulting velocity is scaled to reduce the impact
-    // of overestimation in short traces.
-    static const nsecs_t MIN_WINDOW = 100 * 1000000; // 100 ms
-
     // The minimum duration between samples when estimating velocity.
     static const nsecs_t MIN_DURATION = 10 * 1000000; // 10 ms
 
@@ -674,6 +669,87 @@
     int32_t mActivePointerId;
 };
 
+
+/*
+ * Specifies parameters that govern pointer or wheel acceleration.
+ */
+struct VelocityControlParameters {
+    // A scale factor that is multiplied with the raw velocity deltas
+    // prior to applying any other velocity control factors.  The scale
+    // factor should be used to adapt the input device resolution
+    // (eg. counts per inch) to the output device resolution (eg. pixels per inch).
+    //
+    // Must be a positive value.
+    // Default is 1.0 (no scaling).
+    float scale;
+
+    // The scaled speed at which acceleration begins to be applied.
+    // This value establishes the upper bound of a low speed regime for
+    // small precise motions that are performed without any acceleration.
+    //
+    // Must be a non-negative value.
+    // Default is 0.0 (no low threshold).
+    float lowThreshold;
+
+    // The scaled speed at which maximum acceleration is applied.
+    // The difference between highThreshold and lowThreshold controls
+    // the range of speeds over which the acceleration factor is interpolated.
+    // The wider the range, the smoother the acceleration.
+    //
+    // Must be a non-negative value greater than or equal to lowThreshold.
+    // Default is 0.0 (no high threshold).
+    float highThreshold;
+
+    // The acceleration factor.
+    // When the speed is above the low speed threshold, the velocity will scaled
+    // by an interpolated value between 1.0 and this amount.
+    //
+    // Must be a positive greater than or equal to 1.0.
+    // Default is 1.0 (no acceleration).
+    float acceleration;
+
+    VelocityControlParameters() :
+            scale(1.0f), lowThreshold(0.0f), highThreshold(0.0f), acceleration(1.0f) {
+    }
+
+    VelocityControlParameters(float scale, float lowThreshold,
+            float highThreshold, float acceleration) :
+            scale(scale), lowThreshold(lowThreshold),
+            highThreshold(highThreshold), acceleration(acceleration) {
+    }
+};
+
+/*
+ * Implements mouse pointer and wheel speed control and acceleration.
+ */
+class VelocityControl {
+public:
+    VelocityControl();
+
+    /* Sets the various parameters. */
+    void setParameters(const VelocityControlParameters& parameters);
+
+    /* Resets the current movement counters to zero.
+     * This has the effect of nullifying any acceleration. */
+    void reset();
+
+    /* Translates a raw movement delta into an appropriately
+     * scaled / accelerated delta based on the current velocity. */
+    void move(nsecs_t eventTime, float* deltaX, float* deltaY);
+
+private:
+    // If no movements are received within this amount of time,
+    // we assume the movement has stopped and reset the movement counters.
+    static const nsecs_t STOP_TIME = 500 * 1000000; // 500 ms
+
+    VelocityControlParameters mParameters;
+
+    nsecs_t mLastMovementTime;
+    VelocityTracker::Position mRawPosition;
+    VelocityTracker mVelocityTracker;
+};
+
+
 /*
  * Describes the characteristics and capabilities of an input device.
  */
diff --git a/include/utils/ResourceTypes.h b/include/utils/ResourceTypes.h
index 2c7cf75..8a92cd6 100644
--- a/include/utils/ResourceTypes.h
+++ b/include/utils/ResourceTypes.h
@@ -841,6 +841,7 @@
         DENSITY_DEFAULT = ACONFIGURATION_DENSITY_DEFAULT,
         DENSITY_LOW = ACONFIGURATION_DENSITY_LOW,
         DENSITY_MEDIUM = ACONFIGURATION_DENSITY_MEDIUM,
+        DENSITY_TV = ACONFIGURATION_DENSITY_TV,
         DENSITY_HIGH = ACONFIGURATION_DENSITY_HIGH,
         DENSITY_NONE = ACONFIGURATION_DENSITY_NONE
     };
@@ -1452,24 +1453,20 @@
     // settings is the requested settings
     inline bool match(const ResTable_config& settings) const {
         if (imsi != 0) {
-            if ((settings.mcc != 0 && mcc != 0
-                 && mcc != settings.mcc) || 
-                (settings.mcc == 0 && mcc != 0)) {
+            if (mcc != 0 && mcc != settings.mcc) {
                 return false;
             }
-            if ((settings.mnc != 0 && mnc != 0
-                 && mnc != settings.mnc) ||
-                (settings.mnc == 0 && mnc != 0)) {
+            if (mnc != 0 && mnc != settings.mnc) {
                 return false;
             }
         }
         if (locale != 0) {
-            if (settings.language[0] != 0 && language[0] != 0
+            if (language[0] != 0
                 && (language[0] != settings.language[0]
                     || language[1] != settings.language[1])) {
                 return false;
             }
-            if (settings.country[0] != 0 && country[0] != 0
+            if (country[0] != 0
                 && (country[0] != settings.country[0]
                     || country[1] != settings.country[1])) {
                 return false;
@@ -1480,66 +1477,56 @@
             const int setScreenSize = settings.screenLayout&MASK_SCREENSIZE;
             // Any screen sizes for larger screens than the setting do not
             // match.
-            if ((setScreenSize != 0 && screenSize != 0
-                    && screenSize > setScreenSize) ||
-                    (setScreenSize == 0 && screenSize != 0)) {
+            if (screenSize != 0 && screenSize > setScreenSize) {
                 return false;
             }
             
             const int screenLong = screenLayout&MASK_SCREENLONG;
             const int setScreenLong = settings.screenLayout&MASK_SCREENLONG;
-            if (setScreenLong != 0 && screenLong != 0
-                    && screenLong != setScreenLong) {
+            if (screenLong != 0 && screenLong != setScreenLong) {
                 return false;
             }
 
             const int uiModeType = uiMode&MASK_UI_MODE_TYPE;
             const int setUiModeType = settings.uiMode&MASK_UI_MODE_TYPE;
-            if (setUiModeType != 0 && uiModeType != 0
-                    && uiModeType != setUiModeType) {
+            if (uiModeType != 0 && uiModeType != setUiModeType) {
                 return false;
             }
 
             const int uiModeNight = uiMode&MASK_UI_MODE_NIGHT;
             const int setUiModeNight = settings.uiMode&MASK_UI_MODE_NIGHT;
-            if (setUiModeNight != 0 && uiModeNight != 0
-                    && uiModeNight != setUiModeNight) {
+            if (uiModeNight != 0 && uiModeNight != setUiModeNight) {
                 return false;
             }
 
-            if (settings.smallestScreenWidthDp != 0 && smallestScreenWidthDp != 0
+            if (smallestScreenWidthDp != 0
                     && smallestScreenWidthDp > settings.smallestScreenWidthDp) {
                 return false;
             }
         }
         if (screenSizeDp != 0) {
-            if (settings.screenWidthDp != 0 && screenWidthDp != 0
-                    && screenWidthDp > settings.screenWidthDp) {
+            if (screenWidthDp != 0 && screenWidthDp > settings.screenWidthDp) {
                 //LOGI("Filtering out width %d in requested %d", screenWidthDp, settings.screenWidthDp);
                 return false;
             }
-            if (settings.screenHeightDp != 0 && screenHeightDp != 0
-                    && screenHeightDp > settings.screenHeightDp) {
+            if (screenHeightDp != 0 && screenHeightDp > settings.screenHeightDp) {
                 //LOGI("Filtering out height %d in requested %d", screenHeightDp, settings.screenHeightDp);
                 return false;
             }
         }
         if (screenType != 0) {
-            if (settings.orientation != 0 && orientation != 0
-                && orientation != settings.orientation) {
+            if (orientation != 0 && orientation != settings.orientation) {
                 return false;
             }
             // density always matches - we can scale it.  See isBetterThan
-            if (settings.touchscreen != 0 && touchscreen != 0
-                && touchscreen != settings.touchscreen) {
+            if (touchscreen != 0 && touchscreen != settings.touchscreen) {
                 return false;
             }
         }
         if (input != 0) {
             const int keysHidden = inputFlags&MASK_KEYSHIDDEN;
             const int setKeysHidden = settings.inputFlags&MASK_KEYSHIDDEN;
-            if (setKeysHidden != 0 && keysHidden != 0
-                && keysHidden != setKeysHidden) {
+            if (keysHidden != 0 && keysHidden != setKeysHidden) {
                 // For compatibility, we count a request for KEYSHIDDEN_NO as also
                 // matching the more recent KEYSHIDDEN_SOFT.  Basically
                 // KEYSHIDDEN_NO means there is some kind of keyboard available.
@@ -1551,36 +1538,29 @@
             }
             const int navHidden = inputFlags&MASK_NAVHIDDEN;
             const int setNavHidden = settings.inputFlags&MASK_NAVHIDDEN;
-            if (setNavHidden != 0 && navHidden != 0
-                && navHidden != setNavHidden) {
+            if (navHidden != 0 && navHidden != setNavHidden) {
                 return false;
             }
-            if (settings.keyboard != 0 && keyboard != 0
-                && keyboard != settings.keyboard) {
+            if (keyboard != 0 && keyboard != settings.keyboard) {
                 return false;
             }
-            if (settings.navigation != 0 && navigation != 0
-                && navigation != settings.navigation) {
+            if (navigation != 0 && navigation != settings.navigation) {
                 return false;
             }
         }
         if (screenSize != 0) {
-            if (settings.screenWidth != 0 && screenWidth != 0
-                && screenWidth > settings.screenWidth) {
+            if (screenWidth != 0 && screenWidth > settings.screenWidth) {
                 return false;
             }
-            if (settings.screenHeight != 0 && screenHeight != 0
-                && screenHeight > settings.screenHeight) {
+            if (screenHeight != 0 && screenHeight > settings.screenHeight) {
                 return false;
             }
         }
         if (version != 0) {
-            if (settings.sdkVersion != 0 && sdkVersion != 0
-                && sdkVersion > settings.sdkVersion) {
+            if (sdkVersion != 0 && sdkVersion > settings.sdkVersion) {
                 return false;
             }
-            if (settings.minorVersion != 0 && minorVersion != 0
-                && minorVersion != settings.minorVersion) {
+            if (minorVersion != 0 && minorVersion != settings.minorVersion) {
                 return false;
             }
         }
diff --git a/libs/ui/Input.cpp b/libs/ui/Input.cpp
index 1ba38a7..0af7f80 100644
--- a/libs/ui/Input.cpp
+++ b/libs/ui/Input.cpp
@@ -13,6 +13,10 @@
 // Log debug messages about velocity tracking.
 #define DEBUG_VELOCITY 0
 
+// Log debug messages about acceleration.
+#define DEBUG_ACCELERATION 0
+
+
 #include <stdlib.h>
 #include <unistd.h>
 #include <ctype.h>
@@ -20,6 +24,7 @@
 #include <ui/Input.h>
 
 #include <math.h>
+#include <limits.h>
 
 #ifdef HAVE_ANDROID_OS
 #include <binder/Parcel.h>
@@ -693,6 +698,10 @@
 
 // --- VelocityTracker ---
 
+const uint32_t VelocityTracker::HISTORY_SIZE;
+const nsecs_t VelocityTracker::MAX_AGE;
+const nsecs_t VelocityTracker::MIN_DURATION;
+
 VelocityTracker::VelocityTracker() {
     clear();
 }
@@ -881,14 +890,6 @@
 
         // Make sure we used at least one sample.
         if (samplesUsed != 0) {
-            // Scale the velocity linearly if the window of samples is small.
-            nsecs_t totalDuration = newestMovement.eventTime - oldestMovement.eventTime;
-            if (totalDuration < MIN_WINDOW) {
-                float scale = float(totalDuration) / float(MIN_WINDOW);
-                accumVx *= scale;
-                accumVy *= scale;
-            }
-
             *outVx = accumVx;
             *outVy = accumVy;
             return true;
@@ -902,6 +903,85 @@
 }
 
 
+// --- VelocityControl ---
+
+const nsecs_t VelocityControl::STOP_TIME;
+
+VelocityControl::VelocityControl() {
+    reset();
+}
+
+void VelocityControl::setParameters(const VelocityControlParameters& parameters) {
+    mParameters = parameters;
+    reset();
+}
+
+void VelocityControl::reset() {
+    mLastMovementTime = LLONG_MIN;
+    mRawPosition.x = 0;
+    mRawPosition.y = 0;
+    mVelocityTracker.clear();
+}
+
+void VelocityControl::move(nsecs_t eventTime, float* deltaX, float* deltaY) {
+    if ((deltaX && *deltaX) || (deltaY && *deltaY)) {
+        if (eventTime >= mLastMovementTime + STOP_TIME) {
+#if DEBUG_ACCELERATION
+            LOGD("VelocityControl: stopped, last movement was %0.3fms ago",
+                    (eventTime - mLastMovementTime) * 0.000001f);
+#endif
+            reset();
+        }
+
+        mLastMovementTime = eventTime;
+        if (deltaX) {
+            mRawPosition.x += *deltaX;
+        }
+        if (deltaY) {
+            mRawPosition.y += *deltaY;
+        }
+        mVelocityTracker.addMovement(eventTime, BitSet32(BitSet32::valueForBit(0)), &mRawPosition);
+
+        float vx, vy;
+        float scale = mParameters.scale;
+        if (mVelocityTracker.getVelocity(0, &vx, &vy)) {
+            float speed = hypotf(vx, vy) * scale;
+            if (speed >= mParameters.highThreshold) {
+                // Apply full acceleration above the high speed threshold.
+                scale *= mParameters.acceleration;
+            } else if (speed > mParameters.lowThreshold) {
+                // Linearly interpolate the acceleration to apply between the low and high
+                // speed thresholds.
+                scale *= 1 + (speed - mParameters.lowThreshold)
+                        / (mParameters.highThreshold - mParameters.lowThreshold)
+                        * (mParameters.acceleration - 1);
+            }
+
+#if DEBUG_ACCELERATION
+            LOGD("VelocityControl(%0.3f, %0.3f, %0.3f, %0.3f): "
+                    "vx=%0.3f, vy=%0.3f, speed=%0.3f, accel=%0.3f",
+                    mParameters.scale, mParameters.lowThreshold, mParameters.highThreshold,
+                    mParameters.acceleration,
+                    vx, vy, speed, scale / mParameters.scale);
+#endif
+        } else {
+#if DEBUG_ACCELERATION
+            LOGD("VelocityControl(%0.3f, %0.3f, %0.3f, %0.3f): unknown velocity",
+                    mParameters.scale, mParameters.lowThreshold, mParameters.highThreshold,
+                    mParameters.acceleration);
+#endif
+        }
+
+        if (deltaX) {
+            *deltaX *= scale;
+        }
+        if (deltaY) {
+            *deltaY *= scale;
+        }
+    }
+}
+
+
 // --- InputDeviceInfo ---
 
 InputDeviceInfo::InputDeviceInfo() {