Recalibrate the touchwheel after unlocking

Also power it down whilst we're locked. This saves about half a
milliamp.

2 files changed, 8 insertions, 3 deletions

diff --git a/src/drivers/include/drivers/touchwheel.hpp b/src/drivers/include/drivers/touchwheel.hpp
index 60902087..9cd925a6 100644
--- a/src/drivers/include/drivers/touchwheel.hpp
+++ b/src/drivers/include/drivers/touchwheel.hpp
@@ -39,7 +39,8 @@ class TouchWheel {
   auto Update() -> void;
   auto GetTouchWheelData() const -> TouchWheelData;
 
-  auto PowerDown() -> void;
+  auto Recalibrate() -> void;
+  auto LowPowerMode(bool en) -> void;
 
  private:
   TouchWheelData data_;
diff --git a/src/drivers/touchwheel.cpp b/src/drivers/touchwheel.cpp
index 5d55c6f2..402b839d 100644
--- a/src/drivers/touchwheel.cpp
+++ b/src/drivers/touchwheel.cpp
@@ -137,8 +137,12 @@ TouchWheelData TouchWheel::GetTouchWheelData() const {
   return data_;
 }
 
-auto TouchWheel::PowerDown() -> void {
-  WriteRegister(LOW_POWER, 0);
+auto TouchWheel::Recalibrate() -> void {
+  WriteRegister(CALIBRATE, 1);
+}
+
+auto TouchWheel::LowPowerMode(bool en) -> void {
+  WriteRegister(LOW_POWER, en ? 0 : 1);
 }
 
 }  // namespace drivers