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rust: device: support dev_printk on all devices

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Currently, `dev_*` only works on the core `Device`, but not on any other
bus or class device objects. This causes a pattern of
`dev_info!(pdev.as_ref())` which is not ideal.

This adds support of using these devices directly with `dev_*` macros, by
adding `AsRef` call inside the macro. To make sure we can still use just
`kernel::device::Device`, as `AsRef` implementation is added for it; this
is typical for types that is designed to use with `AsRef` anyway, for
example, `str` implements `AsRef<str>` and `Path` implements `AsRef<Path>`.

Signed-off-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260123175854.176735-1-gary@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
Gary Guo 2026-01-23 17:58:38 +00:00 • committed by Danilo Krummrich
parent e62e48adf7
commit a38cd1fea9
1 changed files with 8 additions and 1 deletions
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9
rust/kernel/device.rs
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@ -599,6 +599,13 @@ impl DeviceContext for Core {}
impl DeviceContext for CoreInternal {}
impl DeviceContext for Normal {}
impl<Ctx: DeviceContext> AsRef<Device<Ctx>> for Device<Ctx> {
#[inline]
fn as_ref(&self) -> &Device<Ctx> {
self
}
}
/// Convert device references to bus device references.
///
/// Bus devices can implement this trait to allow abstractions to provide the bus device in
@ -718,7 +725,7 @@ macro_rules! impl_device_context_into_aref {
macro_rules! dev_printk {
($method:ident, $dev:expr, $($f:tt)*) => {
{
($dev).$method($crate::prelude::fmt!($($f)*));
$crate::device::Device::$method($dev.as_ref(), $crate::prelude::fmt!($($f)*))
}
}
}