linux-kernel - [PATCH v5 4/6] rust: platform: Add ACPI match table support to `Driver` trait

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Message-ID: <20250611175121.803370-1-igor.korotin.linux@gmail.com>
Date: Wed, 11 Jun 2025 18:51:21 +0100
From: Igor Korotin <igor.korotin.linux@...il.com>
To: ojeda@...nel.org,
	alex.gaynor@...il.com,
	rafael@...nel.org,
	gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	linux-acpi@...r.kernel.org
Cc: boqun.feng@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	benno.lossin@...ton.me,
	a.hindborg@...nel.org,
	aliceryhl@...gle.com,
	tmgross@...ch.edu,
	dakr@...nel.org,
	lenb@...nel.org,
	wedsonaf@...il.com,
	viresh.kumar@...aro.org,
	alex.hung@....com,
	dingxiangfei2009@...il.com
Subject: [PATCH v5 4/6] rust: platform: Add ACPI match table support to `Driver` trait

Extend the `platform::Driver` trait to support ACPI device matching by
adding the `ACPI_ID_TABLE` constant.

This allows Rust platform drivers to define ACPI match tables alongside
their existing OF match tables. These changes mirror the existing OF
support and allow Rust platform drivers to match devices based on ACPI
identifiers.

In addition, set `OF_ID_TABLE` to `None` by default to match the behavior
of `ACPI_ID_TABLE` and to avoid requiring drivers that do not use OF
matching to import unnecessary dependencies or define dummy values.

Signed-off-by: Igor Korotin <igor.korotin.linux@...il.com>
---
 rust/kernel/platform.rs | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/rust/kernel/platform.rs b/rust/kernel/platform.rs
index 5923d29a0511..62a9e4ec5c19 100644
--- a/rust/kernel/platform.rs
+++ b/rust/kernel/platform.rs
@@ -37,12 +37,18 @@ unsafe fn register(
             None => core::ptr::null(),
         };
 
+        let acpi_table = match T::ACPI_ID_TABLE {
+            Some(table) => table.as_ptr(),
+            None => core::ptr::null(),
+        };
+
         // SAFETY: It's safe to set the fields of `struct platform_driver` on initialization.
         unsafe {
             (*pdrv.get()).driver.name = name.as_char_ptr();
             (*pdrv.get()).probe = Some(Self::probe_callback);
             (*pdrv.get()).remove = Some(Self::remove_callback);
             (*pdrv.get()).driver.of_match_table = of_table;
+            (*pdrv.get()).driver.acpi_match_table = acpi_table;
         }
 
         // SAFETY: `pdrv` is guaranteed to be a valid `RegType`.
@@ -96,7 +102,7 @@ fn of_id_table() -> Option<of::IdTable<Self::IdInfo>> {
     }
 
     fn acpi_id_table() -> Option<acpi::IdTable<Self::IdInfo>> {
-        None
+        T::ACPI_ID_TABLE
     }
 }
 
@@ -127,7 +133,7 @@ macro_rules! module_platform_driver {
 /// # Example
 ///
 ///```
-/// # use kernel::{bindings, c_str, device::Core, of, platform};
+/// # use kernel::{acpi, bindings, c_str, device::Core, of, platform};
 ///
 /// struct MyDriver;
 ///
@@ -140,9 +146,19 @@ macro_rules! module_platform_driver {
 ///     ]
 /// );
 ///
+/// kernel::acpi_device_table!(
+///     ACPI_TABLE,
+///     MODULE_ACPI_TABLE,
+///     <MyDriver as platform::Driver>::IdInfo,
+///     [
+///         (acpi::DeviceId::new(c_str!("TEST4321")), ())
+///     ]
+/// );
+///
 /// impl platform::Driver for MyDriver {
 ///     type IdInfo = ();
 ///     const OF_ID_TABLE: Option<of::IdTable<Self::IdInfo>> = Some(&OF_TABLE);
+///     const ACPI_ID_TABLE: Option<acpi::IdTable<Self::IdInfo>> = Some(&ACPI_TABLE);
 ///
 ///     fn probe(
 ///         _pdev: &platform::Device<Core>,
@@ -162,7 +178,10 @@ pub trait Driver: Send {
     type IdInfo: 'static;
 
     /// The table of OF device ids supported by the driver.
-    const OF_ID_TABLE: Option<of::IdTable<Self::IdInfo>>;
+    const OF_ID_TABLE: Option<of::IdTable<Self::IdInfo>> = None;
+
+    /// The table of ACPI device ids supported by the driver.
+    const ACPI_ID_TABLE: Option<acpi::IdTable<Self::IdInfo>> = None;
 
     /// Platform driver probe.
     ///
-- 
2.43.0