diff options
| author | Markus Probst <markus.probst@posteo.de> | 2025-10-27 20:06:03 +0000 |
|---|---|---|
| committer | Danilo Krummrich <dakr@kernel.org> | 2025-11-18 11:00:51 +1300 |
| commit | e4addc7cc2dfcc19f1c8c8e47f3834b22cb21559 (patch) | |
| tree | 3b64a849d11179a07ddce4592af810735b250041 /rust/kernel/platform.rs | |
| parent | 13ae55e24a854efd33eb84bbd19a74b933228ccd (diff) | |
rust: Add trait to convert a device reference to a bus device reference
Implement the `AsBusDevice` trait for converting a `Device` reference to a
bus device reference for all bus devices.
The `AsBusDevice` trait allows abstractions to provide the bus device in
class device callbacks. It must not be used by drivers and is intended for
bus and class device abstractions only.
Signed-off-by: Markus Probst <markus.probst@posteo.de>
Link: https://patch.msgid.link/20251027200547.1038967-2-markus.probst@posteo.de
[ * Remove unused import.
* Change visibility of AsBusDevice to public.
* Fix build for USB.
* Add impl for I2cClient.
- Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Diffstat (limited to 'rust/kernel/platform.rs')
| -rw-r--r-- | rust/kernel/platform.rs | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/rust/kernel/platform.rs b/rust/kernel/platform.rs index f4b617c570be..ed889f079cab 100644 --- a/rust/kernel/platform.rs +++ b/rust/kernel/platform.rs @@ -19,6 +19,7 @@ use crate::{ use core::{ marker::PhantomData, + mem::offset_of, ptr::{addr_of_mut, NonNull}, }; @@ -287,6 +288,12 @@ impl Device<Bound> { } } +// SAFETY: `platform::Device` is a transparent wrapper of `struct platform_device`. +// The offset is guaranteed to point to a valid device field inside `platform::Device`. +unsafe impl<Ctx: device::DeviceContext> device::AsBusDevice<Ctx> for Device<Ctx> { + const OFFSET: usize = offset_of!(bindings::platform_device, dev); +} + macro_rules! define_irq_accessor_by_index { ( $(#[$meta:meta])* $fn_name:ident, |