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`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
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//! Device Tree / Open Firmware abstractions.
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use crate::{bindings, device_id::RawDeviceId, prelude::*};
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/// IdTable type for OF drivers.
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pub type IdTable<T> = &'static dyn kernel::device_id::IdTable<DeviceId, T>;
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/// An open firmware device id.
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#[repr(transparent)]
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#[derive(Clone, Copy)]
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pub struct DeviceId(bindings::of_device_id);
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// SAFETY:
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// * `DeviceId` is a `#[repr(transparent)` wrapper of `struct of_device_id` and does not add
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// additional invariants, so it's safe to transmute to `RawType`.
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// * `DRIVER_DATA_OFFSET` is the offset to the `data` field.
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unsafe impl RawDeviceId for DeviceId {
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type RawType = bindings::of_device_id;
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const DRIVER_DATA_OFFSET: usize = core::mem::offset_of!(bindings::of_device_id, data);
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fn index(&self) -> usize {
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self.0.data as _
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}
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}
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impl DeviceId {
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/// Create a new device id from an OF 'compatible' string.
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pub const fn new(compatible: &'static CStr) -> Self {
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let src = compatible.as_bytes_with_nul();
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// Replace with `bindings::of_device_id::default()` once stabilized for `const`.
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// SAFETY: FFI type is valid to be zero-initialized.
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let mut of: bindings::of_device_id = unsafe { core::mem::zeroed() };
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// TODO: Use `clone_from_slice` once the corresponding types do match.
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let mut i = 0;
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while i < src.len() {
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of.compatible[i] = src[i] as _;
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i += 1;
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}
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Self(of)
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}
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}
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/// Create an OF `IdTable` with an "alias" for modpost.
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#[macro_export]
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macro_rules! of_device_table {
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($table_name:ident, $module_table_name:ident, $id_info_type: ty, $table_data: expr) => {
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const $table_name: $crate::device_id::IdArray<
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$crate::of::DeviceId,
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$id_info_type,
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{ $table_data.len() },
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> = $crate::device_id::IdArray::new($table_data);
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$crate::module_device_table!("of", $module_table_name, $table_name);
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};
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}
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