Implement usbc_mux_info tool command

tool/src/ec.rs

@@ -40,6 +40,7 @@ enum Cmd {
     SecurityGet = 20,
     SecuritySet = 21,
     FanTach = 22,
+    UsbcMuxInfo = 23,
 }
 
 const CMD_SPI_FLAG_READ: u8 = 1 << 0;
@@ -328,6 +329,16 @@ impl<A: Access> Ec<A> {
        self.command(Cmd::SecuritySet, &mut data)
     }
 
+    /// Get USB-C mux info
+    pub unsafe fn usbc_mux_info(&mut self, port: u8) -> Result<u16, Error> {
+       let mut data = [port, 0, 0];
+       self.command(Cmd::UsbcMuxInfo, &mut data)?;
+        Ok(
+            (data[1] as u16) |
+            ((data[2] as u16) << 8)
+        )
+    }
+
     /// Read fan tachometer by fan index
     pub unsafe fn fan_tach(&mut self, index: u8) -> Result<u16, Error> {
         let mut data = [

tool/src/main.rs

@@ -300,6 +300,13 @@ unsafe fn security_set(ec: &mut Ec<Box<dyn Access>>, state: SecurityState) -> Re
     Ok(())
 }
 
+unsafe fn usbc_mux_info(ec: &mut Ec<Box<dyn Access>>, port: u8) -> Result<(), Error> {
+    let info = ec.usbc_mux_info(port)?;
+    println!("{:04X}", info);
+
+    Ok(())
+}
+
 fn parse_color(s: &str) -> Result<(u8, u8, u8), String> {
     let r = u8::from_str_radix(&s[0..2], 16);
     let g = u8::from_str_radix(&s[2..4], 16);
@@ -411,6 +418,12 @@ fn main() {
                 .possible_values(["lock", "unlock"])
             )
         )
+        .subcommand(SubCommand::with_name("usbc_mux_info")
+            .arg(Arg::with_name("port")
+                .value_parser(clap::value_parser!(u8))
+                .required(true)
+            )
+        )
         .get_matches();
 
     let get_ec = || -> Result<_, Error> {
@@ -693,6 +706,16 @@ fn main() {
                 },
             }
         },
+        Some(("usbc_mux_info", sub_m)) => {
+            let port = sub_m.get_one::<u8>("port").unwrap();
+            match unsafe { usbc_mux_info(&mut ec, *port) } {
+                Ok(()) => (),
+                Err(err) => {
+                    eprintln!("failed to get usbc_mux_info {}: {:X?}", port, err);
+                    process::exit(1);
+                },
+            }
+        },
         _ => unreachable!()
     }
 }