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+// SPDX-License-Identifier: GPL-2.0
+
+//! Rust I2C client registration sample.
+//!
+//! An I2C client in Rust cannot exist on its own. To register a new I2C client,
+//! it must be bound to a parent device. In this sample driver, a platform device
+//! is used as the parent.
+//!
+
+//! ACPI match table test
+//!
+//! This demonstrates how to test an ACPI-based Rust I2C client registration 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, "LNUXBEEF") // 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 LNUXBEEF:00: Probed with info: '0'.
+//! ```
+//!
+
+use kernel::{
+ acpi,
+ c_str,
+ device,
+ devres::Devres,
+ i2c,
+ of,
+ platform,
+ prelude::*,
+ sync::aref::ARef, //
+};
+
+#[pin_data]
+struct SampleDriver {
+ parent_dev: ARef<platform::Device>,
+ #[pin]
+ _reg: Devres<i2c::Registration>,
+}
+
+kernel::of_device_table!(
+ OF_TABLE,
+ MODULE_OF_TABLE,
+ <SampleDriver as platform::Driver>::IdInfo,
+ [(of::DeviceId::new(c_str!("test,rust-device")), ())]
+);
+
+kernel::acpi_device_table!(
+ ACPI_TABLE,
+ MODULE_ACPI_TABLE,
+ <SampleDriver as platform::Driver>::IdInfo,
+ [(acpi::DeviceId::new(c_str!("LNUXBEEF")), ())]
+);
+
+const SAMPLE_I2C_CLIENT_ADDR: u16 = 0x30;
+const SAMPLE_I2C_ADAPTER_INDEX: i32 = 0;
+const BOARD_INFO: i2c::I2cBoardInfo =
+ i2c::I2cBoardInfo::new(c_str!("rust_driver_i2c"), SAMPLE_I2C_CLIENT_ADDR);
+
+impl platform::Driver for SampleDriver {
+ 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<device::Core>,
+ _info: Option<&Self::IdInfo>,
+ ) -> impl PinInit<Self, Error> {
+ dev_info!(
+ pdev.as_ref(),
+ "Probe Rust I2C Client registration sample.\n"
+ );
+
+ kernel::try_pin_init!( Self {
+ parent_dev: pdev.into(),
+
+ _reg <- {
+ let adapter = i2c::I2cAdapter::get(SAMPLE_I2C_ADAPTER_INDEX)?;
+
+ i2c::Registration::new(&adapter, &BOARD_INFO, pdev.as_ref())
+ }
+ })
+ }
+
+ fn unbind(pdev: &platform::Device<device::Core>, _this: Pin<&Self>) {
+ dev_info!(
+ pdev.as_ref(),
+ "Unbind Rust I2C Client registration sample.\n"
+ );
+ }
+}
+
+kernel::module_platform_driver! {
+ type: SampleDriver,
+ name: "rust_device_i2c",
+ authors: ["Danilo Krummrich", "Igor Korotin"],
+ description: "Rust I2C client registration",
+ license: "GPL v2",
+}