vibrator: Switch from 0-255 to 0.0f-1.0f range for amplitude

* This was missed when converting to AIDL
* Fixes strength control for effects

Change-Id: Iedcdbb455b67b9466a76e53ca9273cbcdcede059

aidl/vibrator/Vibrator.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021 The LineageOS Project
+ * Copyright (C) 2021-2023 The LineageOS Project
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -101,7 +101,7 @@ ndk::ScopedAStatus Vibrator::on(int32_t timeoutMs, const std::shared_ptr<IVibrat
 
 ndk::ScopedAStatus Vibrator::perform(Effect effect, EffectStrength strength, const std::shared_ptr<IVibratorCallback>& callback, int32_t* _aidl_return) {
     ndk::ScopedAStatus status;
-    uint32_t amplitude = strengthToAmplitude(strength, &status);
+    float amplitude = strengthToAmplitude(strength, &status);
     uint32_t ms = 1000;
 
     if (!status.isOk())
@@ -152,16 +152,14 @@ ndk::ScopedAStatus Vibrator::getSupportedEffects(std::vector<Effect>* _aidl_retu
 ndk::ScopedAStatus Vibrator::setAmplitude(float amplitude) {
     uint32_t intensity;
 
-    if (amplitude == 0) {
+    if (amplitude <= 0.0f || amplitude > 1.0f) {
-        return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+        return ndk::ScopedAStatus(AStatus_fromExceptionCode(EX_ILLEGAL_ARGUMENT));
     }
 
-    LOG(DEBUG) << "Setting amplitude: " << (uint32_t)amplitude;
+    LOG(DEBUG) << "Setting amplitude: " << amplitude;
+
+    intensity = amplitude * INTENSITY_MAX;
 
-    intensity = std::lround((amplitude - 1) * INTENSITY_MAX / 254.0);
-    if (intensity > INTENSITY_MAX) {
-        intensity = INTENSITY_MAX;
-    }
     LOG(DEBUG) << "Setting intensity: " << intensity;
 
     if (mHasTimedOutIntensity) {
@@ -260,16 +258,16 @@ ndk::ScopedAStatus Vibrator::activate(uint32_t timeoutMs) {
     return writeNode(VIBRATOR_TIMEOUT_PATH, timeoutMs);
 }
 
-uint8_t Vibrator::strengthToAmplitude(EffectStrength strength, ndk::ScopedAStatus* status) {
+float Vibrator::strengthToAmplitude(EffectStrength strength, ndk::ScopedAStatus* status) {
     *status = ndk::ScopedAStatus::ok();
 
     switch (strength) {
         case EffectStrength::LIGHT:
-            return 64;
+            return AMPLITUDE_LIGHT;
         case EffectStrength::MEDIUM:
-            return 128;
+            return AMPLITUDE_MEDIUM;
         case EffectStrength::STRONG:
-            return 255;
+            return AMPLITUDE_STRONG;
     }
 
     *status = ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);

aidl/vibrator/Vibrator.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021 The LineageOS Project
+ * Copyright (C) 2021-2023 The LineageOS Project
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -12,6 +12,10 @@
 #define INTENSITY_MAX 10000
 #define INTENSITY_DEFAULT INTENSITY_MAX
 
+#define AMPLITUDE_LIGHT 0.25
+#define AMPLITUDE_MEDIUM 0.5
+#define AMPLITUDE_STRONG 1
+
 #define VIBRATOR_TIMEOUT_PATH "/sys/class/timed_output/vibrator/enable"
 #define VIBRATOR_INTENSITY_PATH "/sys/class/timed_output/vibrator/intensity"
 #define VIBRATOR_CP_TRIGGER_PATH "/sys/class/timed_output/vibrator/cp_trigger_index"
@@ -60,7 +64,7 @@ public:
 private:
     ndk::ScopedAStatus activate(uint32_t ms);
     static uint32_t effectToMs(Effect effect, ndk::ScopedAStatus* status);
-    static uint8_t strengthToAmplitude(EffectStrength strength, ndk::ScopedAStatus* status);
+    static float strengthToAmplitude(EffectStrength strength, ndk::ScopedAStatus* status);
 
     bool mEnabled{false};
     bool mExternalControl{false};