// SPDX-License-Identifier: GPL-2.0 //! `ioctl()` number definitions.//!//! C header: [`include/asm-generic/ioctl.h`](srctree/include/asm-generic/ioctl.h) #![expect(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));     (dir << uapi::_IOC_DIRSHIFT)        | (ty << uapi::_IOC_TYPESHIFT)        | (nr << uapi::_IOC_NRSHIFT)        | ((size as u32) << uapi::_IOC_SIZESHIFT)} /// Build an ioctl number for an argumentless ioctl.#[inline(always)]pub const fn _IO(ty: u32, nr: u32) -> u32 {    _IOC(uapi::_IOC_NONE, ty, nr, 0)} /// Build an ioctl number for a read-only ioctl.#[inline(always)]pub const fn _IOR<T>(ty: u32, nr: u32) -> u32 {    _IOC(uapi::_IOC_READ, ty, nr, core::mem::size_of::<T>())} /// Build an ioctl number for a write-only ioctl.#[inline(always)]pub const fn _IOW<T>(ty: u32, nr: u32) -> u32 {    _IOC(uapi::_IOC_WRITE, ty, nr, core::mem::size_of::<T>())} /// Build an ioctl number for a read-write ioctl.#[inline(always)]pub const fn _IOWR<T>(ty: u32, nr: u32) -> u32 {    _IOC(        uapi::_IOC_READ | uapi::_IOC_WRITE,        ty,        nr,        core::mem::size_of::<T>(),    )} /// Get the ioctl direction from an ioctl number.pub const fn _IOC_DIR(nr: u32) -> u32 {    (nr >> uapi::_IOC_DIRSHIFT) & uapi::_IOC_DIRMASK} /// Get the ioctl type from an ioctl number.pub const fn _IOC_TYPE(nr: u32) -> u32 {    (nr >> uapi::_IOC_TYPESHIFT) & uapi::_IOC_TYPEMASK} /// Get the ioctl number from an ioctl number.pub const fn _IOC_NR(nr: u32) -> u32 {    (nr >> uapi::_IOC_NRSHIFT) & uapi::_IOC_NRMASK} /// Get the ioctl size from an ioctl number.pub const fn _IOC_SIZE(nr: u32) -> usize {    ((nr >> uapi::_IOC_SIZESHIFT) & uapi::_IOC_SIZEMASK) as usize}