diff --git a/services/inputflinger/reader/Android.bp b/services/inputflinger/reader/Android.bp
index 51546ce..3bd3275 100644
--- a/services/inputflinger/reader/Android.bp
+++ b/services/inputflinger/reader/Android.bp
@@ -71,6 +71,7 @@
         "libstatslog",
         "libui",
         "libutils",
+        "PlatformProperties",
     ],
     static_libs: [
         "libc++fs",
diff --git a/services/inputflinger/reader/mapper/MultiTouchInputMapper.cpp b/services/inputflinger/reader/mapper/MultiTouchInputMapper.cpp
index ff3a592..41a8426 100644
--- a/services/inputflinger/reader/mapper/MultiTouchInputMapper.cpp
+++ b/services/inputflinger/reader/mapper/MultiTouchInputMapper.cpp
@@ -18,6 +18,8 @@
 
 #include "MultiTouchInputMapper.h"
 
+#include <android/sysprop/InputProperties.sysprop.h>
+
 namespace android {
 
 // --- Constants ---
@@ -309,6 +311,10 @@
                 outPointer.toolType = AMOTION_EVENT_TOOL_TYPE_FINGER;
             }
         }
+        if (shouldSimulateStylusWithTouch() &&
+            outPointer.toolType == AMOTION_EVENT_TOOL_TYPE_FINGER) {
+            outPointer.toolType = AMOTION_EVENT_TOOL_TYPE_STYLUS;
+        }
 
         bool isHovering = mTouchButtonAccumulator.getToolType() != AMOTION_EVENT_TOOL_TYPE_MOUSE &&
                 (mTouchButtonAccumulator.isHovering() ||
@@ -385,7 +391,15 @@
 }
 
 bool MultiTouchInputMapper::hasStylus() const {
-    return mMultiTouchMotionAccumulator.hasStylus() || mTouchButtonAccumulator.hasStylus();
+    return mMultiTouchMotionAccumulator.hasStylus() || mTouchButtonAccumulator.hasStylus() ||
+            shouldSimulateStylusWithTouch();
+}
+
+bool MultiTouchInputMapper::shouldSimulateStylusWithTouch() const {
+    static const bool SIMULATE_STYLUS_WITH_TOUCH =
+            sysprop::InputProperties::simulate_stylus_with_touch().value_or(false);
+    return SIMULATE_STYLUS_WITH_TOUCH &&
+            mParameters.deviceType == Parameters::DeviceType::TOUCH_SCREEN;
 }
 
 } // namespace android
diff --git a/services/inputflinger/reader/mapper/MultiTouchInputMapper.h b/services/inputflinger/reader/mapper/MultiTouchInputMapper.h
index 225ad49..b7c3457 100644
--- a/services/inputflinger/reader/mapper/MultiTouchInputMapper.h
+++ b/services/inputflinger/reader/mapper/MultiTouchInputMapper.h
@@ -104,6 +104,14 @@
     bool hasStylus() const override;
 
 private:
+    // simulate_stylus_with_touch is a debug mode that converts all finger pointers reported by this
+    // mapper's touchscreen into stylus pointers, and adds SOURCE_STYLUS to the input device.
+    // It is used to simulate stylus events for debugging and testing on a device that does not
+    // support styluses. It can be enabled using
+    // "adb shell setprop persist.debug.input.simulate_stylus_with_touch true",
+    // and requires a reboot to take effect.
+    inline bool shouldSimulateStylusWithTouch() const;
+
     // If the slot is in use, return the bit id. Return std::nullopt otherwise.
     std::optional<int32_t> getActiveBitId(const MultiTouchMotionAccumulator::Slot& inSlot);
     MultiTouchMotionAccumulator mMultiTouchMotionAccumulator;