linux-kernel - [PATCH v4 5/5] samples: rust: add ACPI match table example to platform driver

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Message-ID: <20250610151002.238890-1-igor.korotin.linux@gmail.com>
Date: Tue, 10 Jun 2025 16:10:02 +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 v4 5/5] samples: rust: add ACPI match table example to platform driver

Extend the Rust sample platform driver to probe using device/driver name
matching, OF ID table matching, or ACPI ID table matching.

Signed-off-by: Igor Korotin <igor.korotin.linux@...il.com>
---
 samples/rust/rust_driver_platform.rs | 70 +++++++++++++++++++++++++++-
 1 file changed, 69 insertions(+), 1 deletion(-)

diff --git a/samples/rust/rust_driver_platform.rs b/samples/rust/rust_driver_platform.rs
index e3992e7a71e9..35d5067aa023 100644
--- a/samples/rust/rust_driver_platform.rs
+++ b/samples/rust/rust_driver_platform.rs
@@ -17,10 +17,78 @@ struct SampleDriver {
     [(of::DeviceId::new(c_str!("test,rust-device")), Info(42))]
 );
 
+// ACPI match table test
+//
+// This demonstrates how to test an ACPI-based Rust platform driver using QEMU
+// with a custom SSDT.
+//
+// Steps:
+//
+// 1. **Create an SSDT source file** (`ssdt.dsl`) with the following content:
+//
+//     ```asl
+//     DefinitionBlock ("", "SSDT", 2, "TEST", "VIRTACPI", 0x00000001)
+//     {
+//         Scope (\_SB)
+//         {
+//             Device (T432)
+//             {
+//                 Name (_HID, "TEST4321")  // ACPI hardware ID to match
+//                 Name (_UID, 1)
+//                 Name (_STA, 0x0F)        // Device present, enabled
+//                 Name (_CRS, ResourceTemplate ()
+//                 {
+//                     Memory32Fixed (ReadWrite, 0xFED00000, 0x1000)
+//                 })
+//             }
+//         }
+//     }
+//     ```
+//
+// 2. **Compile the table**:
+//
+//     ```sh
+//     iasl -tc ssdt.dsl
+//     ```
+//
+//     This generates `ssdt.aml`
+//
+// 3. **Run QEMU** with the compiled AML file:
+//
+//     ```sh
+//     qemu-system-x86_64 -m 512M \
+//         -enable-kvm \
+//         -kernel path/to/bzImage \
+//         -append "root=/dev/sda console=ttyS0" \
+//         -hda rootfs.img \
+//         -serial stdio \
+//         -acpitable file=ssdt.aml
+//     ```
+//
+//     Requirements:
+//     - The `rust_driver_platform` must be present either:
+//         - built directly into the kernel (`bzImage`), or
+//         - available as a `.ko` file and loadable from `rootfs.img`
+//
+// 4. **Verify it worked** by checking `dmesg`:
+//
+//     ```
+//     rust_driver_platform TEST4321:00: Probed with info: '0'.
+//     ```
+//
+// This demonstrates ACPI table matching using a custom ID in QEMU with a minimal SSDT
+
+kernel::acpi_device_table!(
+    ACPI_TABLE,
+    MODULE_ACPI_TABLE,
+    <SampleDriver as platform::Driver>::IdInfo,
+    [(acpi::DeviceId::new(c_str!("TEST4321")), Info(0))]
+);
+
 impl platform::Driver for SampleDriver {
     type IdInfo = Info;
     const OF_ID_TABLE: Option<of::IdTable<Self::IdInfo>> = Some(&OF_TABLE);
-    const ACPI_ID_TABLE: Option<acpi::IdTable<Self::IdInfo>> = None;
+    const ACPI_ID_TABLE: Option<acpi::IdTable<Self::IdInfo>> = Some(&ACPI_TABLE);
 
     fn probe(
         pdev: &platform::Device<Core>,
-- 
2.43.0