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// SPDX-License-Identifier: GPL-2.0
//! Device Tree / Open Firmware abstractions.
use crate::{
bindings,
device_id::{RawDeviceId, RawDeviceIdIndex},
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`.
unsafe impl RawDeviceId for DeviceId {
type RawType = bindings::of_device_id;
}
// SAFETY: `DRIVER_DATA_OFFSET` is the offset to the `data` field.
unsafe impl RawDeviceIdIndex for DeviceId {
const DRIVER_DATA_OFFSET: usize = core::mem::offset_of!(bindings::of_device_id, data);
}
impl DeviceId {
/// Create a new device id from an OF 'compatible' string.
pub const fn new(compatible: &'static CStr) -> Self {
let src = compatible.to_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 `copy_from_slice` once stabilized for `const`.
let mut i = 0;
while i < src.len() {
of.compatible[i] = src[i];
i += 1;
}
Self(of)
}
}
/// Create an OF `IdTable` with an "alias" for modpost.
#[macro_export]
macro_rules! of_device_table {
($($tt:tt)*) => {
$crate::module_device_table!("of", $crate::of::DeviceId, $($tt)*);
};
}
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