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45bbc63
Update ioctl.rs
xuan-lab Oct 26, 2024
fdae9a0
Update ioctl.rs
xuan-lab Oct 26, 2024
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17 changes: 12 additions & 5 deletions rust/kernel/ioctl.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,18 +3,17 @@
//! `ioctl()` number definitions.
//!
//! C header: [`include/asm-generic/ioctl.h`](srctree/include/asm-generic/ioctl.h)

#![allow(non_snake_case)]

use crate::build_assert;

/// Build an ioctl number, analogous to the C macro of the same name.
#[inline(always)]
const fn _IOC(dir: u32, ty: u32, nr: u32, size: usize) -> u32 {
build_assert!(dir <= uapi::_IOC_DIRMASK);
build_assert!(ty <= uapi::_IOC_TYPEMASK);
build_assert!(nr <= uapi::_IOC_NRMASK);
build_assert!(size <= (uapi::_IOC_SIZEMASK as usize));
build_assert!(dir <= uapi::_IOC_DIRMASK, "Invalid direction value");
build_assert!(ty <= uapi::_IOC_TYPEMASK, "Invalid type value");
build_assert!(nr <= uapi::_IOC_NRMASK, "Invalid number value");
build_assert!(size <= (uapi::_IOC_SIZEMASK as usize), "Invalid size value");

(dir << uapi::_IOC_DIRSHIFT)
| (ty << uapi::_IOC_TYPESHIFT)
Expand Down Expand Up @@ -70,3 +69,11 @@ pub const fn _IOC_NR(nr: u32) -> u32 {
pub const fn _IOC_SIZE(nr: u32) -> usize {
((nr >> uapi::_IOC_SIZESHIFT) & uapi::_IOC_SIZEMASK) as usize
}

// Example usage
const MY_DEVICE_TYPE: u32 = 0x1234;
const MY_IOCTL_NUMBER: u32 = 0x01;

// Creating IOCTL numbers
const IOCTL_MY_DEVICE_READ: u32 = _IOR<MyDataType>(MY_DEVICE_TYPE, MY_IOCTL_NUMBER);
const IOCTL_MY_DEVICE_WRITE: u32 = _IOW<MyDataType>(MY_DEVICE_TYPE, MY_IOCTL_NUMBER);