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rust: driver: add DriverData type to the DriverLayout trait

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Add an associated type DriverData to the DriverLayout trait indicating
the type of the driver's device private data.

Acked-by: Alice Ryhl <aliceryhl@google.com>
Acked-by: Igor Korotin <igor.korotin.linux@gmail.com>
Link: https://patch.msgid.link/20260107103511.570525-6-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
Danilo Krummrich
2026-01-07 11:35:04 +01:00
parent c1d4519e1c
commit 2ad0f490c2
6 changed files with 14 additions and 0 deletions
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2
rust/kernel/auxiliary.rs
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@@ -25,10 +25,12 @@ pub struct Adapter<T: Driver>(T);
// SAFETY:
// - `bindings::auxiliary_driver` is a C type declared as `repr(C)`.
// - `T` is the type of the driver's device private data.
// - `struct auxiliary_driver` embeds a `struct device_driver`.
// - `DEVICE_DRIVER_OFFSET` is the correct byte offset to the embedded `struct device_driver`.
unsafe impl<T: Driver + 'static> driver::DriverLayout for Adapter<T> {
type DriverType = bindings::auxiliary_driver;
type DriverData = T;
const DEVICE_DRIVER_OFFSET: usize = core::mem::offset_of!(Self::DriverType, driver);
}

4
rust/kernel/driver.rs
View File

@@ -108,11 +108,15 @@ use pin_init::{pin_data, pinned_drop, PinInit};
///
/// Implementors must guarantee that:
/// - `DriverType` is `repr(C)`,
/// - `DriverData` is the type of the driver's device private data.
/// - `DriverType` embeds a valid `struct device_driver` at byte offset `DEVICE_DRIVER_OFFSET`.
pub unsafe trait DriverLayout {
/// The specific driver type embedding a `struct device_driver`.
type DriverType: Default;
/// The type of the driver's device private data.
type DriverData;
/// Byte offset of the embedded `struct device_driver` within `DriverType`.
///
/// This must correspond exactly to the location of the embedded `struct device_driver` field.

2
rust/kernel/i2c.rs
View File

@@ -94,10 +94,12 @@ pub struct Adapter<T: Driver>(T);
// SAFETY:
// - `bindings::i2c_driver` is a C type declared as `repr(C)`.
// - `T` is the type of the driver's device private data.
// - `struct i2c_driver` embeds a `struct device_driver`.
// - `DEVICE_DRIVER_OFFSET` is the correct byte offset to the embedded `struct device_driver`.
unsafe impl<T: Driver + 'static> driver::DriverLayout for Adapter<T> {
type DriverType = bindings::i2c_driver;
type DriverData = T;
const DEVICE_DRIVER_OFFSET: usize = core::mem::offset_of!(Self::DriverType, driver);
}

2
rust/kernel/pci.rs
View File

@@ -52,10 +52,12 @@ pub struct Adapter<T: Driver>(T);
// SAFETY:
// - `bindings::pci_driver` is a C type declared as `repr(C)`.
// - `T` is the type of the driver's device private data.
// - `struct pci_driver` embeds a `struct device_driver`.
// - `DEVICE_DRIVER_OFFSET` is the correct byte offset to the embedded `struct device_driver`.
unsafe impl<T: Driver + 'static> driver::DriverLayout for Adapter<T> {
type DriverType = bindings::pci_driver;
type DriverData = T;
const DEVICE_DRIVER_OFFSET: usize = core::mem::offset_of!(Self::DriverType, driver);
}

2
rust/kernel/platform.rs
View File

@@ -28,10 +28,12 @@ pub struct Adapter<T: Driver>(T);
// SAFETY:
// - `bindings::platform_driver` is a C type declared as `repr(C)`.
// - `T` is the type of the driver's device private data.
// - `struct platform_driver` embeds a `struct device_driver`.
// - `DEVICE_DRIVER_OFFSET` is the correct byte offset to the embedded `struct device_driver`.
unsafe impl<T: Driver + 'static> driver::DriverLayout for Adapter<T> {
type DriverType = bindings::platform_driver;
type DriverData = T;
const DEVICE_DRIVER_OFFSET: usize = core::mem::offset_of!(Self::DriverType, driver);
}

2
rust/kernel/usb.rs
View File

@@ -29,10 +29,12 @@ pub struct Adapter<T: Driver>(T);
// SAFETY:
// - `bindings::usb_driver` is a C type declared as `repr(C)`.
// - `T` is the type of the driver's device private data.
// - `struct usb_driver` embeds a `struct device_driver`.
// - `DEVICE_DRIVER_OFFSET` is the correct byte offset to the embedded `struct device_driver`.
unsafe impl<T: Driver + 'static> driver::DriverLayout for Adapter<T> {
type DriverType = bindings::usb_driver;
type DriverData = T;
const DEVICE_DRIVER_OFFSET: usize = core::mem::offset_of!(Self::DriverType, driver);
}