@@ -302,6 +302,7 @@ F: include/linux/acpi.h
F: include/linux/fwnode.h
F: include/linux/fw_table.h
F: lib/fw_table.c
+F: rust/kernel/acpi.rs
F: tools/power/acpi/
ACPI APEI
new file mode 100644
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Advanced Configuration and Power Interface abstractions.
+
+use crate::{bindings, device_id::RawDeviceId, prelude::*};
+
+/// IdTable type for ACPI drivers.
+pub type IdTable<T> = &'static dyn kernel::device_id::IdTable<DeviceId, T>;
+
+/// An ACPI device id.
+#[repr(transparent)]
+#[derive(Clone, Copy)]
+pub struct DeviceId(bindings::acpi_device_id);
+
+// SAFETY:
+// * `DeviceId` is a `#[repr(transparent)` wrapper of `struct acpi_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::acpi_device_id;
+
+ const DRIVER_DATA_OFFSET: usize = core::mem::offset_of!(bindings::acpi_device_id, driver_data);
+
+ fn index(&self) -> usize {
+ self.0.driver_data as _
+ }
+}
+
+impl DeviceId {
+ const ACPI_ID_LEN: usize = 16;
+
+ /// Create a new device id from an ACPI 'id' string.
+ pub const fn new(id: &'static CStr) -> Self {
+ assert!(id.len() <= Self::ACPI_ID_LEN, "ID exceeds 16 bytes");
+ let src = id.as_bytes_with_nul();
+ // Replace with `bindings::acpi_device_id::default()` once stabilized for `const`.
+ // SAFETY: FFI type is valid to be zero-initialized.
+ let mut acpi: bindings::acpi_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() {
+ acpi.id[i] = src[i] as _;
+ i += 1;
+ }
+
+ Self(acpi)
+ }
+}
+
+/// Create an ACPI `IdTable` with an "alias" for modpost.
+#[macro_export]
+macro_rules! acpi_device_table {
+ ($table_name:ident, $module_table_name:ident, $id_info_type: ty, $table_data: expr) => {
+ const $table_name: $crate::device_id::IdArray<
+ $crate::acpi::DeviceId,
+ $id_info_type,
+ { $table_data.len() },
+ > = $crate::device_id::IdArray::new($table_data);
+
+ $crate::module_device_table!("acpi", $module_table_name, $table_name);
+ };
+}
+
@@ -78,6 +78,7 @@
#[cfg(CONFIG_NET)]
pub mod net;
pub mod of;
+pub mod acpi;
pub mod page;
#[cfg(CONFIG_I2C)]
pub mod i2c;
`acpi::DeviceId` is an abstraction around `struct acpi_device_id`. This is used by subsequent patches, in particular the i2c driver abstractions, to create ACPI device ID tables. Signed-off-by: Igor Korotin <igor.korotin.linux@gmail.com> --- MAINTAINERS | 1 + rust/kernel/acpi.rs | 63 +++++++++++++++++++++++++++++++++++++++++++++ rust/kernel/lib.rs | 1 + 3 files changed, 65 insertions(+) create mode 100644 rust/kernel/acpi.rs