tool: Add a system76_ec command to disable input events

For testing Launch keyboards.

Could easily support in EC firmware as well if we had a use for that,
but not adding that for now.

tool/src/ec.rs

@@ -35,6 +35,7 @@ enum Cmd {
     LedSetMode = 16,
     MatrixGet = 17,
     LedSave = 18,
+    SetNoInput = 19,
 }
 
 const CMD_SPI_FLAG_READ: u8 = 1 << 0;
@@ -279,6 +280,10 @@ impl<A: Access> Ec<A> {
         self.command(Cmd::MatrixGet, matrix)
     }
 
+    pub unsafe fn set_no_input(&mut self, no_input: bool) -> Result<(), Error> {
+        self.command(Cmd::SetNoInput, &mut [no_input as u8])
+    }
+
     pub fn into_dyn(self) -> Ec<Box<dyn Access>>
     where A: 'static {
         Ec {