Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
73 lines
2.0 KiB
Rust
73 lines
2.0 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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//! `ioctl()` number definitions.
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//!
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//! C header: [`include/asm-generic/ioctl.h`](srctree/include/asm-generic/ioctl.h)
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#![expect(non_snake_case)]
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use crate::build_assert;
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/// Build an ioctl number, analogous to the C macro of the same name.
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#[inline(always)]
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const fn _IOC(dir: u32, ty: u32, nr: u32, size: usize) -> u32 {
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build_assert!(dir <= uapi::_IOC_DIRMASK);
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build_assert!(ty <= uapi::_IOC_TYPEMASK);
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build_assert!(nr <= uapi::_IOC_NRMASK);
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build_assert!(size <= (uapi::_IOC_SIZEMASK as usize));
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(dir << uapi::_IOC_DIRSHIFT)
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| (ty << uapi::_IOC_TYPESHIFT)
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| (nr << uapi::_IOC_NRSHIFT)
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| ((size as u32) << uapi::_IOC_SIZESHIFT)
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}
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/// Build an ioctl number for an argumentless ioctl.
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#[inline(always)]
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pub const fn _IO(ty: u32, nr: u32) -> u32 {
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_IOC(uapi::_IOC_NONE, ty, nr, 0)
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}
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/// Build an ioctl number for a read-only ioctl.
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#[inline(always)]
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pub const fn _IOR<T>(ty: u32, nr: u32) -> u32 {
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_IOC(uapi::_IOC_READ, ty, nr, core::mem::size_of::<T>())
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}
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/// Build an ioctl number for a write-only ioctl.
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#[inline(always)]
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pub const fn _IOW<T>(ty: u32, nr: u32) -> u32 {
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_IOC(uapi::_IOC_WRITE, ty, nr, core::mem::size_of::<T>())
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}
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/// Build an ioctl number for a read-write ioctl.
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#[inline(always)]
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pub const fn _IOWR<T>(ty: u32, nr: u32) -> u32 {
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_IOC(
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uapi::_IOC_READ | uapi::_IOC_WRITE,
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ty,
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nr,
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core::mem::size_of::<T>(),
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)
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}
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/// Get the ioctl direction from an ioctl number.
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pub const fn _IOC_DIR(nr: u32) -> u32 {
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(nr >> uapi::_IOC_DIRSHIFT) & uapi::_IOC_DIRMASK
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}
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/// Get the ioctl type from an ioctl number.
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pub const fn _IOC_TYPE(nr: u32) -> u32 {
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(nr >> uapi::_IOC_TYPESHIFT) & uapi::_IOC_TYPEMASK
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}
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/// Get the ioctl number from an ioctl number.
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pub const fn _IOC_NR(nr: u32) -> u32 {
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(nr >> uapi::_IOC_NRSHIFT) & uapi::_IOC_NRMASK
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}
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/// Get the ioctl size from an ioctl number.
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pub const fn _IOC_SIZE(nr: u32) -> usize {
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((nr >> uapi::_IOC_SIZESHIFT) & uapi::_IOC_SIZEMASK) as usize
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}
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