chromium_ec: Add host command to read board ID

This command is not present on all systems, it was only recently added
to our main branch and will be slowly backported.

Signed-off-by: Daniel Schaefer <dhs@frame.work>

Author: JohnAZoidberg

framework_lib/src/chromium_ec/command.rs

@@ -110,6 +110,8 @@ pub enum EcCommands {
     GetGpuPcie = 0x3E1E,
     /// Set gpu bay serial and program structure
     ProgramGpuEeprom = 0x3E1F,
+    /// Read board ID of specific ADC channel
+    ReadBoardId = 0x3E26,
 }
 
 pub trait EcRequest<R> {

framework_lib/src/chromium_ec/commands.rs

@@ -1658,3 +1658,39 @@ impl EcRequest<EcResponseSetGpuSerial> for EcRequestSetGpuSerial {
         EcCommands::ProgramGpuEeprom
     }
 }
+
+#[repr(u8)]
+#[derive(Debug, Clone, Copy)]
+pub enum BoardIdType {
+    /// Mainboard - any system
+    Mainboard = 0,
+    /// Power button board - Framework 12
+    PowerButtonBoard = 1,
+    /// Touchpad - Framework 12, 13, 16
+    Touchpad = 2,
+    /// Audio Board - Framework 12, 13
+    AudioBoard = 3,
+    /// dGPU board - Framework 16
+    DGpu0 = 4,
+    /// dGPU board - Framework 16
+    DGpu1 = 5,
+}
+
+#[repr(C, packed)]
+pub struct EcRequestReadBoardId {
+    /// See BoardIdType
+    pub board_id_type: u8,
+}
+
+#[repr(C, packed)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+pub struct EcResponseReadBoardId {
+    /// Board ID: -1 invalid, 0–14 valid, 15 not present
+    pub board_id: i8,
+}
+
+impl EcRequest<EcResponseReadBoardId> for EcRequestReadBoardId {
+    fn command_id() -> EcCommands {
+        EcCommands::ReadBoardId
+    }
+}

framework_lib/src/chromium_ec/mod.rs

@@ -1743,6 +1743,22 @@ impl CrosEc {
         Ok(())
     }
 
+    pub fn read_board_id_hc(&self, board_id_type: BoardIdType) -> EcResult<Option<u8>> {
+        let res = EcRequestReadBoardId {
+            board_id_type: board_id_type as u8,
+        }
+        .send_command(self)?;
+        match res.board_id {
+            -1 => Err(EcError::DeviceError(format!(
+                "Failed to read Board ID {:?}",
+                board_id_type
+            ))),
+            15 => Ok(None),
+            0..=14 => Ok(Some(res.board_id as u8)),
+            n => Err(EcError::DeviceError(format!("Invalid Board ID {}", n))),
+        }
+    }
+
     pub fn get_uptime_info(&self) -> EcResult<()> {
         let res = EcRequestGetUptimeInfo {}.send_command(self)?;
         let t_since_boot = Duration::from_millis(res.time_since_ec_boot.into());