diff --git a/vibrator/aidl/aidl_api/android.hardware.vibrator/current/android/hardware/vibrator/VendorEffect.aidl b/vibrator/aidl/aidl_api/android.hardware.vibrator/current/android/hardware/vibrator/VendorEffect.aidl
index 1900084..62a7380 100644
--- a/vibrator/aidl/aidl_api/android.hardware.vibrator/current/android/hardware/vibrator/VendorEffect.aidl
+++ b/vibrator/aidl/aidl_api/android.hardware.vibrator/current/android/hardware/vibrator/VendorEffect.aidl
@@ -37,4 +37,5 @@
   android.os.PersistableBundle vendorData;
   android.hardware.vibrator.EffectStrength strength = android.hardware.vibrator.EffectStrength.MEDIUM;
   float scale;
+  float vendorScale;
 }
diff --git a/vibrator/aidl/android/hardware/vibrator/VendorEffect.aidl b/vibrator/aidl/android/hardware/vibrator/VendorEffect.aidl
index 2155aca..6b1af53 100644
--- a/vibrator/aidl/android/hardware/vibrator/VendorEffect.aidl
+++ b/vibrator/aidl/android/hardware/vibrator/VendorEffect.aidl
@@ -36,16 +36,35 @@
 
     /**
      * The intensity of the haptic effect.
+     *
+     * This value is defined by discrete scale levels that represents the intensity of this haptic
+     * effect. This is a discrete representation of the scale parameter below.
      */
     EffectStrength strength = EffectStrength.MEDIUM;
 
     /**
-     * A scale to be applied to the haptic effect intensity.
+     * The intensity of the haptic effect.
      *
-     * This value represents a linear scale that should be applied on top of the effect strength to
-     * dynamically adapt to the device state.
+     * This value is defined by continuous scale that represents the intensity of this haptic
+     * effect. The vendor implementation can follow the platform scaling function or customize the
+     * implementation to their needs. This is a continuous representation of the strength parameter
+     * above.
      *
      * Values in [0,1) should scale down. Values > 1 should scale up within hardware bounds.
      */
     float scale;
+
+    /**
+     * The dynamic scale parameter provided by the vendor vibrator controller.
+     *
+     * This value is the same provided by the vendor to the platform IVibratorControlService and
+     * should be applied on top of the effect intensity provided by the strength/scale fields.
+     * The vendor can use this to dynamically adapt the haptic effect intensity to the device state.
+     *
+     * See frameworks/hardware/interfaces/vibrator for more documentation on vendor vibrator
+     * controller, and ScaleParam for more about this scale parameter.
+     *
+     * Values in [0,1) should scale down. Values > 1 should scale up within hardware bounds.
+     */
+    float vendorScale;
 }
diff --git a/vibrator/aidl/default/Vibrator.cpp b/vibrator/aidl/default/Vibrator.cpp
index acf7d34..29e7d18 100644
--- a/vibrator/aidl/default/Vibrator.cpp
+++ b/vibrator/aidl/default/Vibrator.cpp
@@ -117,6 +117,10 @@
     if (scale <= 0) {
         return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
     }
+    float vendorScale = effect.vendorScale;
+    if (vendorScale <= 0) {
+        return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+    }
 
     int32_t durationMs = 0;
     if (!effect.vendorData.getInt("DURATION_MS", &durationMs) || durationMs <= 0) {
diff --git a/vibrator/aidl/vts/VtsHalVibratorTargetTest.cpp b/vibrator/aidl/vts/VtsHalVibratorTargetTest.cpp
index 706ab41..2502589 100644
--- a/vibrator/aidl/vts/VtsHalVibratorTargetTest.cpp
+++ b/vibrator/aidl/vts/VtsHalVibratorTargetTest.cpp
@@ -366,7 +366,8 @@
 TEST_P(VibratorAidl, PerformVendorEffectSupported) {
     if ((capabilities & IVibrator::CAP_PERFORM_VENDOR_EFFECTS) == 0) return;
 
-    float scale = 0.5f;
+    float scale = 0.0f;
+    float vendorScale = 0.0f;
     for (EffectStrength strength : kEffectStrengths) {
         PersistableBundle vendorData;
         ::aidl::android::hardware::vibrator::testing::fillBasicData(&vendorData);
@@ -379,7 +380,9 @@
         effect.vendorData = vendorData;
         effect.strength = strength;
         effect.scale = scale;
-        scale *= 1.5f;
+        effect.vendorScale = vendorScale;
+        scale += 0.5f;
+        vendorScale += 0.2f;
 
         auto callback = ndk::SharedRefBase::make<CompletionCallback>([] {});
         ndk::ScopedAStatus status = vibrator->performVendorEffect(effect, callback);
@@ -408,6 +411,7 @@
 
     for (EffectStrength strength : kEffectStrengths) {
         float scale = 0.5f;
+        float vendorScale = 0.2f;
         for (uint8_t i = 0; i < iterations; i++) {
             PersistableBundle vendorData;
             ::aidl::android::hardware::vibrator::testing::fillRandomData(&vendorData);
@@ -416,7 +420,9 @@
             effect.vendorData = vendorData;
             effect.strength = strength;
             effect.scale = scale;
+            effect.vendorScale = vendorScale;
             scale *= 2;
+            vendorScale *= 1.5f;
 
             auto callback = ndk::SharedRefBase::make<CompletionCallback>([] {});
             ndk::ScopedAStatus status = vibrator->performVendorEffect(effect, callback);
@@ -444,6 +450,7 @@
         VendorEffect effect;
         effect.strength = strength;
         effect.scale = 1.0f;
+        effect.vendorScale = 1.0f;
 
         ndk::ScopedAStatus status = vibrator->performVendorEffect(effect, nullptr /*callback*/);
 
@@ -459,10 +466,12 @@
     VendorEffect effect;
     effect.strength = EffectStrength::MEDIUM;
 
-    effect.scale = 0.0f;
+    effect.scale = -1.0f;
+    effect.vendorScale = 1.0f;
     EXPECT_ILLEGAL_ARGUMENT(vibrator->performVendorEffect(effect, nullptr /*callback*/));
 
-    effect.scale = -1.0f;
+    effect.scale = 1.0f;
+    effect.vendorScale = -1.0f;
     EXPECT_ILLEGAL_ARGUMENT(vibrator->performVendorEffect(effect, nullptr /*callback*/));
 }
 
@@ -473,6 +482,7 @@
         VendorEffect effect;
         effect.strength = strength;
         effect.scale = 1.0f;
+        effect.vendorScale = 1.0f;
 
         EXPECT_UNKNOWN_OR_UNSUPPORTED(vibrator->performVendorEffect(effect, nullptr /*callback*/))
                 << "\n  For vendor effect with strength " << toString(strength);