sm8450-common: udfps: Use 110 nit fod when the brightness is low

Change-Id: I892c8c5eaef6606a7576722ec1751db2f0a9b2ef

udfps/UdfpsHandler.cpp

@@ -20,8 +20,11 @@
 #include "xiaomi_touch.h"
 
 #define COMMAND_NIT 10
-#define PARAM_NIT_FOD 1
-#define PARAM_NIT_NONE 0
+#define TARGET_BRIGHTNESS_OFF 0
+#define TARGET_BRIGHTNESS_1000NIT 1
+#define TARGET_BRIGHTNESS_110NIT 6
+
+#define LOW_BRIGHTNESS_THRESHHOLD 100
 
 #define COMMAND_FOD_PRESS_STATUS 1
 #define PARAM_FOD_PRESSED 1
@@ -115,12 +118,28 @@ class XiaomiSm8450UdfpsHander : public UdfpsHandler {
                 mDevice->extCmd(mDevice, COMMAND_FOD_PRESS_STATUS,
                                 pressed ? PARAM_FOD_PRESSED : PARAM_FOD_RELEASED);
 
+                // Get brightness
+                struct disp_brightness_req brightness_req;
+                int brightness = LOW_BRIGHTNESS_THRESHHOLD;
+                brightness_req.base.flag = 0;
+                brightness_req.base.disp_id = MI_DISP_PRIMARY;
+                rc = ioctl(disp_fd_.get(), MI_DISP_IOCTL_GET_BRIGHTNESS, &brightness_req);
+                if (rc) {
+                    LOG(ERROR) << "failed to get brightness, err: " << rc;
+                } else if (brightness_req.brightness > 0) {
+                    brightness = brightness_req.brightness;
+                }
+                LOG(DEBUG) << "brightness is: " << (int)brightness_req.brightness;
+                bool requestLowBrightness = brightness < LOW_BRIGHTNESS_THRESHHOLD;
+
                 // Request HBM
                 disp_local_hbm_req req;
                 req.base.flag = 0;
                 req.base.disp_id = MI_DISP_PRIMARY;
-                req.local_hbm_value = pressed ? LHBM_TARGET_BRIGHTNESS_WHITE_1000NIT
-                                              : LHBM_TARGET_BRIGHTNESS_OFF_FINGER_UP;
+                req.local_hbm_value =
+                        pressed ? (requestLowBrightness ? LHBM_TARGET_BRIGHTNESS_WHITE_110NIT
+                                                        : LHBM_TARGET_BRIGHTNESS_WHITE_1000NIT)
+                                : LHBM_TARGET_BRIGHTNESS_OFF_FINGER_UP;
                 ioctl(disp_fd_.get(), MI_DISP_IOCTL_SET_LOCAL_HBM, &req);
             }
         }).detach();
@@ -167,9 +186,13 @@ class XiaomiSm8450UdfpsHander : public UdfpsHandler {
                 LOG(DEBUG) << "received data: " << std::bitset<8>(value);
 
                 bool localHbmUiReady = value & LOCAL_HBM_UI_READY;
+                bool requestLowBrightnessCapture = value & FOD_LOW_BRIGHTNESS_CAPTURE;
 
                 mDevice->extCmd(mDevice, COMMAND_NIT,
-                                localHbmUiReady ? PARAM_NIT_FOD : PARAM_NIT_NONE);
+                                localHbmUiReady
+                                        ? (requestLowBrightnessCapture ? TARGET_BRIGHTNESS_110NIT
+                                                                       : TARGET_BRIGHTNESS_1000NIT)
+                                        : TARGET_BRIGHTNESS_OFF);
             }
         }).detach();
     }