// SPDX-License-Identifier: GPL-2.0 //! Rust Platform driver sample. //! 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, "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,    device::{        self,        property::{            FwNodeReferenceArgs,            NArgs, //        },        Core,    },    of,    platform,    prelude::*,    str::CString,    sync::aref::ARef, //}; struct SampleDriver {    pdev: ARef<platform::Device>,} struct Info(u32); kernel::of_device_table!(    OF_TABLE,    <SampleDriver as platform::Driver>::IdInfo,    [(of::DeviceId::new(c"test,rust-device"), Info(42))]); kernel::acpi_device_table!(    ACPI_TABLE,    <SampleDriver as platform::Driver>::IdInfo,    [(acpi::DeviceId::new(c"LNUXBEEF"), Info(0))]); impl platform::Driver for SampleDriver {    type IdInfo = Info;    type Data<'bound> = Self;    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<'bound>(        pdev: &'bound platform::Device<Core<'_>>,        info: Option<&'bound Self::IdInfo>,    ) -> impl PinInit<Self, Error> + 'bound {        let dev = pdev.as_ref();         dev_dbg!(dev, "Probe Rust Platform driver sample.\n");         if let Some(info) = info {            dev_info!(dev, "Probed with info: '{}'.\n", info.0);        }         if dev.fwnode().is_some_and(|node| node.is_of_node()) {            Self::properties_parse(dev)?;        }         Ok(Self { pdev: pdev.into() })    }} impl SampleDriver {    fn properties_parse(dev: &device::Device) -> Result {        let fwnode = dev.fwnode().ok_or(ENOENT)?;         if let Ok(idx) = fwnode.property_match_string(c"compatible", c"test,rust-device") {            dev_info!(dev, "matched compatible string idx = {}\n", idx);        }         let name = c"compatible";        let prop = fwnode.property_read::<CString>(name).required_by(dev)?;        dev_info!(dev, "'{name}'='{prop:?}'\n");         let name = c"test,bool-prop";        let prop = fwnode.property_read_bool(c"test,bool-prop");        dev_info!(dev, "'{name}'='{prop}'\n");         if fwnode.property_present(c"test,u32-prop") {            dev_info!(dev, "'test,u32-prop' is present\n");        }         let name = c"test,u32-optional-prop";        let prop = fwnode.property_read::<u32>(name).or(0x12);        dev_info!(dev, "'{name}'='{prop:#x}' (default = 0x12)\n");         // A missing required property will print an error. Discard the error to        // prevent properties_parse from failing in that case.        let name = c"test,u32-required-prop";        let _ = fwnode.property_read::<u32>(name).required_by(dev);         let name = c"test,u32-prop";        let prop: u32 = fwnode.property_read(name).required_by(dev)?;        dev_info!(dev, "'{name}'='{prop:#x}'\n");         let name = c"test,i16-array";        let prop: [i16; 4] = fwnode.property_read(name).required_by(dev)?;        dev_info!(dev, "'{name}'='{prop:?}'\n");        let len = fwnode.property_count_elem::<u16>(name)?;        dev_info!(dev, "'{name}' length is {len}\n");         let name = c"test,i16-array";        let prop: KVec<i16> = fwnode.property_read_array_vec(name, 4)?.required_by(dev)?;        dev_info!(dev, "'{name}'='{prop:?}' (KVec)\n");         for child in fwnode.children() {            let name = c"test,ref-arg";            let nargs = NArgs::N(2);            let prop: FwNodeReferenceArgs = child.property_get_reference_args(name, nargs, 0)?;            dev_info!(dev, "'{name}'='{prop:?}'\n");        }         Ok(())    }} impl Drop for SampleDriver {    fn drop(&mut self) {        dev_dbg!(self.pdev, "Remove Rust Platform driver sample.\n");    }} kernel::module_platform_driver! {    type: SampleDriver,    name: "rust_driver_platform",    authors: ["Danilo Krummrich"],    description: "Rust Platform driver",    license: "GPL v2",}