mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
bbe3b4d158
`of::DeviceId` is an abstraction around `struct of_device_id`. This is used by subsequent patches, in particular the platform bus abstractions, to create OF device ID tables. Reviewed-by: Rob Herring (Arm) <robh@kernel.org> Signed-off-by: Danilo Krummrich <dakr@kernel.org> Tested-by: Dirk Behme <dirk.behme@de.bosch.com> Tested-by: Fabien Parent <fabien.parent@linaro.org> Link: https://lore.kernel.org/r/20241219170425.12036-13-dakr@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
60 lines
1.9 KiB
Rust
60 lines
1.9 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
//! Device Tree / Open Firmware abstractions.
|
|
|
|
use crate::{bindings, device_id::RawDeviceId, prelude::*};
|
|
|
|
/// IdTable type for OF drivers.
|
|
pub type IdTable<T> = &'static dyn kernel::device_id::IdTable<DeviceId, T>;
|
|
|
|
/// An open firmware device id.
|
|
#[repr(transparent)]
|
|
#[derive(Clone, Copy)]
|
|
pub struct DeviceId(bindings::of_device_id);
|
|
|
|
// SAFETY:
|
|
// * `DeviceId` is a `#[repr(transparent)` wrapper of `struct of_device_id` and does not add
|
|
// additional invariants, so it's safe to transmute to `RawType`.
|
|
// * `DRIVER_DATA_OFFSET` is the offset to the `data` field.
|
|
unsafe impl RawDeviceId for DeviceId {
|
|
type RawType = bindings::of_device_id;
|
|
|
|
const DRIVER_DATA_OFFSET: usize = core::mem::offset_of!(bindings::of_device_id, data);
|
|
|
|
fn index(&self) -> usize {
|
|
self.0.data as _
|
|
}
|
|
}
|
|
|
|
impl DeviceId {
|
|
/// Create a new device id from an OF 'compatible' string.
|
|
pub const fn new(compatible: &'static CStr) -> Self {
|
|
let src = compatible.as_bytes_with_nul();
|
|
// Replace with `bindings::of_device_id::default()` once stabilized for `const`.
|
|
// SAFETY: FFI type is valid to be zero-initialized.
|
|
let mut of: bindings::of_device_id = unsafe { core::mem::zeroed() };
|
|
|
|
// TODO: Use `clone_from_slice` once the corresponding types do match.
|
|
let mut i = 0;
|
|
while i < src.len() {
|
|
of.compatible[i] = src[i] as _;
|
|
i += 1;
|
|
}
|
|
|
|
Self(of)
|
|
}
|
|
}
|
|
|
|
/// Create an OF `IdTable` with an "alias" for modpost.
|
|
#[macro_export]
|
|
macro_rules! of_device_table {
|
|
($table_name:ident, $module_table_name:ident, $id_info_type: ty, $table_data: expr) => {
|
|
const $table_name: $crate::device_id::IdArray<
|
|
$crate::of::DeviceId,
|
|
$id_info_type,
|
|
{ $table_data.len() },
|
|
> = $crate::device_id::IdArray::new($table_data);
|
|
|
|
$crate::module_device_table!("of", $module_table_name, $table_name);
|
|
};
|
|
}
|