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|
// SPDX-License-Identifier: GPL-2.0
//! Rust auxiliary driver sample (based on a PCI driver for QEMU's `pci-testdev`).
//!
//! To make this driver probe, QEMU must be run with `-device pci-testdev`.
use kernel::{
auxiliary, bindings, c_str, device::Core, driver, error::Error, pci, prelude::*, str::CStr,
InPlaceModule,
};
use pin_init::PinInit;
const MODULE_NAME: &CStr = <LocalModule as kernel::ModuleMetadata>::NAME;
const AUXILIARY_NAME: &CStr = c_str!("auxiliary");
struct AuxiliaryDriver;
kernel::auxiliary_device_table!(
AUX_TABLE,
MODULE_AUX_TABLE,
<AuxiliaryDriver as auxiliary::Driver>::IdInfo,
[(auxiliary::DeviceId::new(MODULE_NAME, AUXILIARY_NAME), ())]
);
impl auxiliary::Driver for AuxiliaryDriver {
type IdInfo = ();
const ID_TABLE: auxiliary::IdTable<Self::IdInfo> = &AUX_TABLE;
fn probe(adev: &auxiliary::Device<Core>, _info: &Self::IdInfo) -> Result<Pin<KBox<Self>>> {
dev_info!(
adev.as_ref(),
"Probing auxiliary driver for auxiliary device with id={}\n",
adev.id()
);
ParentDriver::connect(adev)?;
let this = KBox::new(Self, GFP_KERNEL)?;
Ok(this.into())
}
}
struct ParentDriver {
_reg: [auxiliary::Registration; 2],
}
kernel::pci_device_table!(
PCI_TABLE,
MODULE_PCI_TABLE,
<ParentDriver as pci::Driver>::IdInfo,
[(
pci::DeviceId::from_id(bindings::PCI_VENDOR_ID_REDHAT, 0x5),
()
)]
);
impl pci::Driver for ParentDriver {
type IdInfo = ();
const ID_TABLE: pci::IdTable<Self::IdInfo> = &PCI_TABLE;
fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> Result<Pin<KBox<Self>>> {
let this = KBox::new(
Self {
_reg: [
auxiliary::Registration::new(pdev.as_ref(), AUXILIARY_NAME, 0, MODULE_NAME)?,
auxiliary::Registration::new(pdev.as_ref(), AUXILIARY_NAME, 1, MODULE_NAME)?,
],
},
GFP_KERNEL,
)?;
Ok(this.into())
}
}
impl ParentDriver {
fn connect(adev: &auxiliary::Device) -> Result<()> {
let parent = adev.parent().ok_or(EINVAL)?;
let pdev: &pci::Device = parent.try_into()?;
dev_info!(
adev.as_ref(),
"Connect auxiliary {} with parent: VendorID={:#x}, DeviceID={:#x}\n",
adev.id(),
pdev.vendor_id(),
pdev.device_id()
);
Ok(())
}
}
#[pin_data]
struct SampleModule {
#[pin]
_pci_driver: driver::Registration<pci::Adapter<ParentDriver>>,
#[pin]
_aux_driver: driver::Registration<auxiliary::Adapter<AuxiliaryDriver>>,
}
impl InPlaceModule for SampleModule {
fn init(module: &'static kernel::ThisModule) -> impl PinInit<Self, Error> {
try_pin_init!(Self {
_pci_driver <- driver::Registration::new(MODULE_NAME, module),
_aux_driver <- driver::Registration::new(MODULE_NAME, module),
})
}
}
module! {
type: SampleModule,
name: "rust_driver_auxiliary",
author: "Danilo Krummrich",
description: "Rust auxiliary driver",
license: "GPL v2",
}
|
