Set fan target RPM

crosec/src/commands/mod.rs

@@ -9,10 +9,12 @@ pub enum CrosEcCmd {
     GetChipInfo = 0x0005,
     GetBoardVersion = 0x0006,
     GetCmdVersions = 0x0008,
+    SetFanTargetRpm = 0x0021,
 }
 
 pub mod get_chip_info;
 pub mod hello;
 pub mod version;
 pub mod board_version;
+pub mod set_fan_target_rpm;
 pub mod get_cmd_versions;

crosec/src/commands/set_fan_target_rpm.rs

@@ -0,0 +1,41 @@
+use std::mem::size_of;
+use bytemuck::{Pod, Zeroable};
+
+use crate::{ec_command, EcCmdResult, EcInterface};
+use crate::commands::CrosEcCmd;
+
+#[repr(C)]
+#[derive(Pod, Zeroable, Copy, Clone)]
+struct EcParamsSetFanTargetRpmV0 {
+    rpm: u32,
+}
+
+struct EcParamsSetFanTargetRpmV1 {
+    rpm: u32,
+    fan_index: u8,
+}
+
+impl EcParamsSetFanTargetRpmV1 {
+    pub fn to_le_bytes(self) -> [u8; size_of::<u32>() + size_of::<u8>()] {
+        [self.rpm.to_le_bytes().to_vec(), self.fan_index.to_le_bytes().to_vec()].concat().try_into().unwrap()
+    }
+}
+
+pub fn ec_cmd_set_fan_target_rpm(rpm: u32, fan_index: Option<u8>) -> EcCmdResult<()> {
+    // v0 can only set the RPM for all fans
+    // v1 can set the RPM for a specific fan
+    match fan_index {
+        Some(index) => {
+            ec_command(CrosEcCmd::SetFanTargetRpm, 1, &EcParamsSetFanTargetRpmV1 {
+                rpm,
+                fan_index: index,
+            }.to_le_bytes(), EcInterface::Default)?;
+        }
+        None => {
+            ec_command(CrosEcCmd::SetFanTargetRpm, 0, &bytemuck::bytes_of(&EcParamsSetFanTargetRpmV0 {
+                rpm
+            }), EcInterface::Default)?;
+        }
+    };
+    Ok(())
+}

ectool/src/main.rs

@@ -4,6 +4,7 @@ use crosec::commands::{CrosEcCmd, get_chip_info::ec_cmd_get_chip_info, hello::ec
 use crosec::commands::board_version::ec_cmd_board_version;
 use crosec::commands::get_cmd_versions::ec_cmd_get_cmd_versions;
 use num_traits::cast::FromPrimitive;
+use crosec::commands::set_fan_target_rpm::ec_cmd_set_fan_target_rpm;
 
 #[derive(Parser)]
 struct Cli {
@@ -25,6 +26,12 @@ enum Commands {
     CmdVersions {
         command: u32
     },
+    /// Set target fan RPM
+    SetFanTargetRpm {
+        rpm: u32,
+        #[arg()]
+        index: Option<u8>
+    }
 }
 
 fn main() -> Result<()> {
@@ -70,6 +77,17 @@ fn main() -> Result<()> {
                     println!("Unknown Command");
                 }
             }
+        },
+        Commands::SetFanTargetRpm {rpm, index} => {
+            ec_cmd_set_fan_target_rpm(rpm, index)?;
+            match index {
+                Some(index) => {
+                    println!("Set RPM to {rpm} for fan {index}");
+                },
+                None => {
+                    println!("Set RPM to {rpm} for all fans");
+                }
+            }
         }
     }