wahoo: toggle special touch mode when VR mode is active

Bug: 37515573
Change-Id: I5b741323f97f7d4713636a1688f50c9459d2764f

dumpstate/DumpstateDevice.cpp

@@ -153,6 +153,8 @@ static void DumpTouch(int fd) {
     if (!access("/sys/class/input/ftm4_touch", R_OK)) {
         DumpFileToFd(fd, "STM touch firmware config",
                      "/sys/class/input/ftm4_touch/version");
+        DumpFileToFd(fd, "STM touch VR Mode",
+                     "/sys/class/input/ftm4_touch/vrmode");
     }
 }
 

init.hardware.rc

@@ -484,6 +484,9 @@ on boot
     # Make the ftm4 command node writeable from dumpstate
     chown system system /sys/devices/virtual/input/ftm4_touch/cmd
 
+    # ftm4 VR mode
+    chown system system /sys/devices/virtual/input/ftm4_touch/vrmode
+
 service init-elabel-sh /system/bin/init.elabel.sh
     class late_start
     user system

sepolicy/vendor/hal_vr.te

@@ -1,2 +1,6 @@
 # interact with thermal_config
 set_prop(hal_vr, thermal_prop)
+
+# Access to touch vrmode node
+allow hal_vr sysfs_touch:dir r_dir_perms;
+allow hal_vr sysfs_touch:file rw_file_perms;

vr/VrDevice.cpp

@@ -48,6 +48,16 @@ Return<void> VrDevice::setVrMode(bool enabled) {
     if (!android::base::SetProperty("ctl.restart", "thermal-engine")) {
         LOG(ERROR) << "Couldn't set thermal_engine restart property";
     }
+    if (!access("/sys/class/input/ftm4_touch", R_OK)) {
+        FILE *f = fopen("/sys/class/input/ftm4_touch/vrmode", "w");
+        if (f) {
+            fprintf(f, "%d", (enabled ? 1 : 0));
+            fclose(f);
+        }
+        else {
+            LOG(ERROR) << "Couldn't open vrmode sysfs node";
+        }
+    }
     return Void();
 }