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// SPDX-License-Identifier: GPL-2.0
//! Devicetree and Open Firmware abstractions.
//!
//! C header: [`include/linux/of_*.h`](../../../../include/linux/of_*.h)
use crate::{bindings, driver, str::BStr};
/// An open firmware device id.
#[derive(Clone, Copy)]
pub enum DeviceId {
/// An open firmware device id where only a compatible string is specified.
Compatible(&'static BStr),
}
/// Defines a const open firmware device id table that also carries per-entry data/context/info.
///
/// The name of the const is `OF_DEVICE_ID_TABLE`, which is what buses are expected to name their
/// open firmware tables.
///
/// # Examples
///
/// ```
/// # use kernel::define_of_id_table;
/// use kernel::of;
///
/// define_of_id_table! {u32, [
/// (of::DeviceId::Compatible(b"test-device1,test-device2"), Some(0xff)),
/// (of::DeviceId::Compatible(b"test-device3"), None),
/// ]};
/// ```
#[macro_export]
macro_rules! define_of_id_table {
($data_type:ty, $($t:tt)*) => {
$crate::define_id_table!(OF_DEVICE_ID_TABLE, $crate::of::DeviceId, $data_type, $($t)*);
};
}
// SAFETY: `ZERO` is all zeroed-out and `to_rawid` stores `offset` in `of_device_id::data`.
unsafe impl const driver::RawDeviceId for DeviceId {
type RawType = bindings::of_device_id;
const ZERO: Self::RawType = bindings::of_device_id {
name: [0; 32],
type_: [0; 32],
compatible: [0; 128],
data: core::ptr::null(),
};
fn to_rawid(&self, offset: isize) -> Self::RawType {
let DeviceId::Compatible(compatible) = self;
let mut id = Self::ZERO;
let mut i = 0;
while i < compatible.len() {
// If `compatible` does not fit in `id.compatible`, an "index out of bounds" build time
// error will be triggered.
id.compatible[i] = compatible[i] as _;
i += 1;
}
id.compatible[i] = b'\0' as _;
id.data = offset as _;
id
}
}
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