sm7125: fod: Boost screen brightness instead of dimming it

*Instead of dimming the screen when the sensor is pressed we should boost the brightness for better results

*This also makes fingerprint work even when the screen brightness is at its minimum

*Implement a 120ms delay to wait for the brightness to be boosted

Change-Id: I23ff521c289347b4b1c92a11049c7a9670d3d819

fod/FingerprintInscreen.cpp

@@ -26,7 +26,6 @@
 #define FINGERPRINT_ACQUIRED_VENDOR 6
 
 #define TSP_CMD_PATH "/sys/class/sec/tsp/cmd"
-#define BRIGHTNESS_PATH "/sys/class/backlight/panel0-backlight/brightness"
 
 #define SEM_FINGER_STATE 22
 #define SEM_PARAM_PRESSED 2
@@ -72,8 +71,6 @@ static hidl_vec<int8_t> stringToVec(const std::string& str) {
 FingerprintInscreen::FingerprintInscreen() {
     mSehBiometricsFingerprintService = ISehBiometricsFingerprint::getService();
     set(TSP_CMD_PATH, "set_fod_rect,421,2018,659,2256");
-    mPreviousBrightness = get<std::string>(BRIGHTNESS_PATH, "");
-    set(BRIGHTNESS_PATH, "319");
     set(TSP_CMD_PATH, "fod_enable,1,1,0");
 }
 
@@ -90,8 +87,11 @@ Return<void> FingerprintInscreen::onFinishEnroll() {
 }
 
 Return<void> FingerprintInscreen::onPress() {
-    mSehBiometricsFingerprintService->sehRequest(SEM_FINGER_STATE,
-        SEM_PARAM_PRESSED, stringToVec(SEM_AOSP_FQNAME), FingerprintInscreen::requestResult);
+    std::thread([this]() {
+        std::this_thread::sleep_for(std::chrono::milliseconds(120));
+        mSehBiometricsFingerprintService->sehRequest(SEM_FINGER_STATE,
+            SEM_PARAM_PRESSED, stringToVec(SEM_AOSP_FQNAME), FingerprintInscreen::requestResult);
+    }).detach();
     return Void();
 }
 
@@ -99,10 +99,6 @@ Return<void> FingerprintInscreen::onRelease() {
     mSehBiometricsFingerprintService->sehRequest(SEM_FINGER_STATE, 
         SEM_PARAM_RELEASED, stringToVec(SEM_AOSP_FQNAME), FingerprintInscreen::requestResult);
     set(TSP_CMD_PATH, "fod_enable,0");
-    if (!mPreviousBrightness.empty()) {
-        set(BRIGHTNESS_PATH, mPreviousBrightness);
-        mPreviousBrightness = "";
-    }
     return Void();
 }
 
@@ -112,10 +108,6 @@ Return<void> FingerprintInscreen::onShowFODView() {
 
 Return<void> FingerprintInscreen::onHideFODView() {
     set(TSP_CMD_PATH, "fod_enable,0");
-    if (!mPreviousBrightness.empty()) {
-        set(BRIGHTNESS_PATH, mPreviousBrightness);
-        mPreviousBrightness = "";
-    }
     return Void();
 }
 
@@ -153,11 +145,11 @@ Return<void> FingerprintInscreen::setLongPressEnabled(bool) {
 }
 
 Return<int32_t> FingerprintInscreen::getDimAmount(int32_t cur_brightness) {
-    return (int32_t)(255 + ( -40.9291 * pow((double) cur_brightness, 0.3)));
+    return 0;
 }
 
 Return<bool> FingerprintInscreen::shouldBoostBrightness() {
-    return false;
+    return true;
 }
 
 Return<void> FingerprintInscreen::setCallback(const sp<IFingerprintInscreenCallback>& callback) {