Fix DT2W on Xiaomi Mi 11 Lite 5G by using xiaomi-touch

It may also fix for other Xiaomi devices

base.mk

@@ -218,4 +218,7 @@ PRODUCT_COPY_FILES += \
 
 PRODUCT_PACKAGES += phh-ota
 
+PRODUCT_PACKAGES += \
+    xiaomi-touch
+
 include build/make/target/product/gsi_release.mk

cmds/Android.bp

@@ -204,3 +204,10 @@ cc_binary {
 		"oplus-alert-slider.rc",
 	],
 }
+
+cc_binary {
+	name: "xiaomi-touch",
+	srcs: [
+		"xiaomi-touch.cpp",
+	],
+}

cmds/asus-motor.cpp

@@ -3,6 +3,7 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 typedef struct {
     int dir;
@@ -27,4 +28,5 @@ int main(int argc, char **argv) {
 	cfg.speed = 4;
 
 	ioctl(fd, ASUS_MOTOR_DRV_MANUAL_MODE, &cfg);
+	close(fd);
 }

cmds/xiaomi-touch.cpp

@@ -0,0 +1,48 @@
+#include <iostream>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#define SET_CUR_VALUE 0
+
+#define Touch_Game_Mode 0
+#define Touch_Active_MODE 1
+#define Touch_UP_THRESHOLD 2
+#define Touch_Tolerance 3
+#define Touch_Aim_Sensitivity 4
+#define Touch_Tap_Stability 5
+#define Touch_Expert_Mode 6
+#define Touch_Edge_Filter 7
+#define Touch_Panel_Orientation 8
+#define Touch_Report_Rate 9
+#define Touch_Fod_Enable 10
+#define Touch_Aod_Enable 11
+#define Touch_Resist_RF 12
+#define Touch_Idle_Time 13
+#define Touch_Doubletap_Mode 14
+#define Touch_Grip_Mode 15
+#define Touch_FodIcon_Enable 16
+#define Touch_Nonui_Mode 17
+#define Touch_Debug_Level 18
+#define Touch_Power_Status 19
+#define Touch_Mode_NUM 20
+
+#define TOUCH_DEV_PATH "/dev/xiaomi-touch"
+#define TOUCH_ID 0
+#define TOUCH_MAGIC 0x5400
+#define TOUCH_IOC_SETMODE TOUCH_MAGIC + SET_CUR_VALUE
+
+int main(int argc, char **argv) {
+    if(argc != 3) {
+        fprintf(stderr, "Usage: %s <mode> <0|1>\n", argv[0]);
+        return -1;
+    }
+    int mode = atoi(argv[1]);
+    int enabled = atoi(argv[2]);
+    if (mode < 0 || mode > 20) return -1;
+    if (enabled != 0 && enabled != 1) return -1;
+    int fd = open(TOUCH_DEV_PATH, O_RDWR);
+    int arg[3] = {TOUCH_ID, mode, enabled};
+    ioctl(fd, TOUCH_IOC_SETMODE, &arg);
+    close(fd);
+}

phh-prop-handler.sh

@@ -52,6 +52,15 @@ xiaomi_toggle_dt2w_event_node() {
     return 1
 }
 
+xiaomi_toggle_dt2w_ioctl() {
+    if [ -c "/dev/xiaomi-touch" ]; then
+        echo "Trying to set dt2w mode with ioctl on /dev/xiaomi-touch"
+        # 14 - Touch_Doubletap_Mode
+        xiaomi-touch 14 "$1"
+        return
+    fi
+    return 1
+}
 
 restartAudio() {
     setprop ctl.restart audioserver
@@ -66,11 +75,12 @@ if [ "$1" == "persist.sys.phh.xiaomi.dt2w" ]; then
         exit 1
     fi
 
-    if ! xiaomi_toggle_dt2w_proc_node "$prop_value"; then
+    xiaomi_toggle_dt2w_proc_node "$prop_value"
-        # Fallback to event node method
+    # Fallback to event node method
-        xiaomi_toggle_dt2w_event_node "$prop_value"
+    xiaomi_toggle_dt2w_event_node "$prop_value"
-    fi
+    # Fallback to ioctl method
-    exit $?
+    xiaomi_toggle_dt2w_ioctl "$prop_value"
+    exit
 fi
 
 if [ "$1" == "persist.sys.phh.oppo.dt2w" ]; then

sepolicy/file_contexts

@@ -5,6 +5,7 @@
 /system/bin/phh-on-boot.sh u:object_r:phhsu_exec:s0
 /system/bin/phh-on-data.sh u:object_r:phhsu_exec:s0
 /system/bin/asus-motor u:object_r:phhsu_exec:s0
+/system/bin/xiaomi-touch u:object_r:phhsu_exec:s0
 
 #/system/bin/fsck\.exfat                 u:object_r:fsck_exec:s0
 /system/bin/fsck\.ntfs                  u:object_r:fsck_exec:s0