rust/kernel/platform.rs - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0

 //! Abstractions for the platform bus.
 //!
 //! C header: [`include/linux/platform_device.h`](srctree/include/linux/platform_device.h)

 use crate::{
     acpi, bindings, container_of,
     device::{self, Bound},
     driver,
     error::{from_result, to_result, Result},
     io::{mem::IoRequest, Resource},
     of,
     prelude::*,
     types::Opaque,
     ThisModule,
 };

 use core::{
     marker::PhantomData,
     ptr::{addr_of_mut, NonNull},
 };

 /// An adapter for the registration of platform drivers.
 pub struct Adapter<T: Driver>(T);

 // SAFETY: A call to `unregister` for a given instance of `RegType` is guaranteed to be valid if
 // a preceding call to `register` has been successful.
 unsafe impl<T: Driver + 'static> driver::RegistrationOps for Adapter<T> {
     type RegType = bindings::platform_driver;

     unsafe fn register(
         pdrv: &Opaque<Self::RegType>,
         name: &'static CStr,
         module: &'static ThisModule,
     ) -> Result {
         let of_table = match T::OF_ID_TABLE {
             Some(table) => table.as_ptr(),
             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`.
         to_result(unsafe { bindings::__platform_driver_register(pdrv.get(), module.0) })
     }

     unsafe fn unregister(pdrv: &Opaque<Self::RegType>) {
         // SAFETY: `pdrv` is guaranteed to be a valid `RegType`.
         unsafe { bindings::platform_driver_unregister(pdrv.get()) };
     }
 }

 impl<T: Driver + 'static> Adapter<T> {
     extern "C" fn probe_callback(pdev: *mut bindings::platform_device) -> kernel::ffi::c_int {
         // SAFETY: The platform bus only ever calls the probe callback with a valid pointer to a
         // `struct platform_device`.
         //
         // INVARIANT: `pdev` is valid for the duration of `probe_callback()`.
         let pdev = unsafe { &*pdev.cast::<Device<device::CoreInternal>>() };
         let info = <Self as driver::Adapter>::id_info(pdev.as_ref());

         from_result(|| {
             let data = T::probe(pdev, info)?;

             pdev.as_ref().set_drvdata(data);
             Ok(0)
         })
     }

     extern "C" fn remove_callback(pdev: *mut bindings::platform_device) {
         // SAFETY: The platform bus only ever calls the remove callback with a valid pointer to a
         // `struct platform_device`.
         //
         // INVARIANT: `pdev` is valid for the duration of `probe_callback()`.
         let pdev = unsafe { &*pdev.cast::<Device<device::CoreInternal>>() };

         // SAFETY: `remove_callback` is only ever called after a successful call to
         // `probe_callback`, hence it's guaranteed that `Device::set_drvdata()` has been called
         // and stored a `Pin<KBox<T>>`.
         let data = unsafe { pdev.as_ref().drvdata_obtain::<Pin<KBox<T>>>() };

         T::unbind(pdev, data.as_ref());
     }
 }

 impl<T: Driver + 'static> driver::Adapter for Adapter<T> {
     type IdInfo = T::IdInfo;

     fn of_id_table() -> Option<of::IdTable<Self::IdInfo>> {
         T::OF_ID_TABLE
     }

     fn acpi_id_table() -> Option<acpi::IdTable<Self::IdInfo>> {
         T::ACPI_ID_TABLE
     }
 }

 /// Declares a kernel module that exposes a single platform driver.
 ///
 /// # Examples
 ///
 /// ```ignore
 /// kernel::module_platform_driver! {
 ///     type: MyDriver,
 ///     name: "Module name",
 ///     authors: ["Author name"],
 ///     description: "Description",
 ///     license: "GPL v2",
 /// }
 /// ```
 #[macro_export]
 macro_rules! module_platform_driver {
     ($($f:tt)*) => {
         $crate::module_driver!(<T>, $crate::platform::Adapter<T>, { $($f)* });
     };
 }

 /// The platform driver trait.
 ///
 /// Drivers must implement this trait in order to get a platform driver registered.
 ///
 /// # Examples
 ///
 ///```
 /// # use kernel::{acpi, bindings, c_str, device::Core, of, platform};
 ///
 /// struct MyDriver;
 ///
 /// kernel::of_device_table!(
 ///     OF_TABLE,
 ///     MODULE_OF_TABLE,
 ///     <MyDriver as platform::Driver>::IdInfo,
 ///     [
 ///         (of::DeviceId::new(c_str!("test,device")), ())
 ///     ]
 /// );
 ///
 /// kernel::acpi_device_table!(
 ///     ACPI_TABLE,
 ///     MODULE_ACPI_TABLE,
 ///     <MyDriver as platform::Driver>::IdInfo,
 ///     [
 ///         (acpi::DeviceId::new(c_str!("LNUXBEEF")), ())
 ///     ]
 /// );
 ///
 /// 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>,
 ///         _id_info: Option<&Self::IdInfo>,
 ///     ) -> Result<Pin<KBox<Self>>> {
 ///         Err(ENODEV)
 ///     }
 /// }
 ///```
 pub trait Driver: Send {
     /// The type holding driver private data about each device id supported by the driver.
     // TODO: Use associated_type_defaults once stabilized:
     //
     // ```
     // type IdInfo: 'static = ();
     // ```
     type IdInfo: 'static;

     /// The table of OF device ids supported by the driver.
     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.
     ///
     /// Called when a new platform device is added or discovered.
     /// Implementers should attempt to initialize the device here.
     fn probe(dev: &Device<device::Core>, id_info: Option<&Self::IdInfo>)
         -> Result<Pin<KBox<Self>>>;

     /// Platform driver unbind.
     ///
     /// Called when a [`Device`] is unbound from its bound [`Driver`]. Implementing this callback
     /// is optional.
     ///
     /// This callback serves as a place for drivers to perform teardown operations that require a
     /// `&Device<Core>` or `&Device<Bound>` reference. For instance, drivers may try to perform I/O
     /// operations to gracefully tear down the device.
     ///
     /// Otherwise, release operations for driver resources should be performed in `Self::drop`.
     fn unbind(dev: &Device<device::Core>, this: Pin<&Self>) {
         let _ = (dev, this);
     }
 }

 /// The platform device representation.
 ///
 /// This structure represents the Rust abstraction for a C `struct platform_device`. The
 /// implementation abstracts the usage of an already existing C `struct platform_device` within Rust
 /// code that we get passed from the C side.
 ///
 /// # Invariants
 ///
 /// A [`Device`] instance represents a valid `struct platform_device` created by the C portion of
 /// the kernel.
 #[repr(transparent)]
 pub struct Device<Ctx: device::DeviceContext = device::Normal>(
     Opaque<bindings::platform_device>,
     PhantomData<Ctx>,
 );

 impl<Ctx: device::DeviceContext> Device<Ctx> {
     fn as_raw(&self) -> *mut bindings::platform_device {
         self.0.get()
     }

     /// Returns the resource at `index`, if any.
     pub fn resource_by_index(&self, index: u32) -> Option<&Resource> {
         // SAFETY: `self.as_raw()` returns a valid pointer to a `struct platform_device`.
         let resource = unsafe {
             bindings::platform_get_resource(self.as_raw(), bindings::IORESOURCE_MEM, index)
         };

         if resource.is_null() {
             return None;
         }

         // SAFETY: `resource` is a valid pointer to a `struct resource` as
         // returned by `platform_get_resource`.
         Some(unsafe { Resource::from_raw(resource) })
     }

     /// Returns the resource with a given `name`, if any.
     pub fn resource_by_name(&self, name: &CStr) -> Option<&Resource> {
         // SAFETY: `self.as_raw()` returns a valid pointer to a `struct
         // platform_device` and `name` points to a valid C string.
         let resource = unsafe {
             bindings::platform_get_resource_byname(
                 self.as_raw(),
                 bindings::IORESOURCE_MEM,
                 name.as_char_ptr(),
             )
         };

         if resource.is_null() {
             return None;
         }

         // SAFETY: `resource` is a valid pointer to a `struct resource` as
         // returned by `platform_get_resource`.
         Some(unsafe { Resource::from_raw(resource) })
     }
 }

 impl Device<Bound> {
     /// Returns an `IoRequest` for the resource at `index`, if any.
     pub fn io_request_by_index(&self, index: u32) -> Option<IoRequest<'_>> {
         self.resource_by_index(index)
             // SAFETY: `resource` is a valid resource for `&self` during the
             // lifetime of the `IoRequest`.
             .map(|resource| unsafe { IoRequest::new(self.as_ref(), resource) })
     }

     /// Returns an `IoRequest` for the resource with a given `name`, if any.
     pub fn io_request_by_name(&self, name: &CStr) -> Option<IoRequest<'_>> {
         self.resource_by_name(name)
             // SAFETY: `resource` is a valid resource for `&self` during the
             // lifetime of the `IoRequest`.
             .map(|resource| unsafe { IoRequest::new(self.as_ref(), resource) })
     }
 }

 // SAFETY: `Device` is a transparent wrapper of a type that doesn't depend on `Device`'s generic
 // argument.
 kernel::impl_device_context_deref!(unsafe { Device });
 kernel::impl_device_context_into_aref!(Device);

 impl crate::dma::Device for Device<device::Core> {}

 // SAFETY: Instances of `Device` are always reference-counted.
 unsafe impl crate::types::AlwaysRefCounted for Device {
     fn inc_ref(&self) {
         // SAFETY: The existence of a shared reference guarantees that the refcount is non-zero.
         unsafe { bindings::get_device(self.as_ref().as_raw()) };
     }

     unsafe fn dec_ref(obj: NonNull<Self>) {
         // SAFETY: The safety requirements guarantee that the refcount is non-zero.
         unsafe { bindings::platform_device_put(obj.cast().as_ptr()) }
     }
 }

 impl<Ctx: device::DeviceContext> AsRef<device::Device<Ctx>> for Device<Ctx> {
     fn as_ref(&self) -> &device::Device<Ctx> {
         // SAFETY: By the type invariant of `Self`, `self.as_raw()` is a pointer to a valid
         // `struct platform_device`.
         let dev = unsafe { addr_of_mut!((*self.as_raw()).dev) };

         // SAFETY: `dev` points to a valid `struct device`.
         unsafe { device::Device::from_raw(dev) }
     }
 }

 impl<Ctx: device::DeviceContext> TryFrom<&device::Device<Ctx>> for &Device<Ctx> {
     type Error = kernel::error::Error;

     fn try_from(dev: &device::Device<Ctx>) -> Result<Self, Self::Error> {
         // SAFETY: By the type invariant of `Device`, `dev.as_raw()` is a valid pointer to a
         // `struct device`.
         if !unsafe { bindings::dev_is_platform(dev.as_raw()) } {
             return Err(EINVAL);
         }

         // SAFETY: We've just verified that the bus type of `dev` equals
         // `bindings::platform_bus_type`, hence `dev` must be embedded in a valid
         // `struct platform_device` as guaranteed by the corresponding C code.
         let pdev = unsafe { container_of!(dev.as_raw(), bindings::platform_device, dev) };

         // SAFETY: `pdev` is a valid pointer to a `struct platform_device`.
         Ok(unsafe { &*pdev.cast() })
     }
 }

 // SAFETY: A `Device` is always reference-counted and can be released from any thread.
 unsafe impl Send for Device {}

 // SAFETY: `Device` can be shared among threads because all methods of `Device`
 // (i.e. `Device<Normal>) are thread safe.
 unsafe impl Sync for Device {}
	// SPDX-License-Identifier: GPL-2.0

	//! Abstractions for the platform bus.
	//!
	//! C header: [`include/linux/platform_device.h`](srctree/include/linux/platform_device.h)

	use crate::{
	acpi, bindings, container_of,
	device::{self, Bound},
	driver,
	error::{from_result, to_result, Result},
	io::{mem::IoRequest, Resource},
	of,
	prelude::*,
	types::Opaque,
	ThisModule,
	};

	use core::{
	marker::PhantomData,
	ptr::{addr_of_mut, NonNull},
	};

	/// An adapter for the registration of platform drivers.
	pub struct Adapter<T: Driver>(T);

	// SAFETY: A call to `unregister` for a given instance of `RegType` is guaranteed to be valid if
	// a preceding call to `register` has been successful.
	unsafe impl<T: Driver + 'static> driver::RegistrationOps for Adapter<T> {
	type RegType = bindings::platform_driver;

	unsafe fn register(
	pdrv: &Opaque<Self::RegType>,
	name: &'static CStr,
	module: &'static ThisModule,
	) -> Result {
	let of_table = match T::OF_ID_TABLE {
	Some(table) => table.as_ptr(),
	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`.
	to_result(unsafe { bindings::__platform_driver_register(pdrv.get(), module.0) })
	}

	unsafe fn unregister(pdrv: &Opaque<Self::RegType>) {
	// SAFETY: `pdrv` is guaranteed to be a valid `RegType`.
	unsafe { bindings::platform_driver_unregister(pdrv.get()) };
	}
	}

	impl<T: Driver + 'static> Adapter<T> {
	extern "C" fn probe_callback(pdev: *mut bindings::platform_device) -> kernel::ffi::c_int {
	// SAFETY: The platform bus only ever calls the probe callback with a valid pointer to a
	// `struct platform_device`.
	//
	// INVARIANT: `pdev` is valid for the duration of `probe_callback()`.
	let pdev = unsafe { &*pdev.cast::<Device<device::CoreInternal>>() };
	let info = <Self as driver::Adapter>::id_info(pdev.as_ref());

	from_result(\|\| {
	let data = T::probe(pdev, info)?;

	pdev.as_ref().set_drvdata(data);
	Ok(0)
	})
	}

	extern "C" fn remove_callback(pdev: *mut bindings::platform_device) {
	// SAFETY: The platform bus only ever calls the remove callback with a valid pointer to a
	// `struct platform_device`.
	//
	// INVARIANT: `pdev` is valid for the duration of `probe_callback()`.
	let pdev = unsafe { &*pdev.cast::<Device<device::CoreInternal>>() };

	// SAFETY: `remove_callback` is only ever called after a successful call to
	// `probe_callback`, hence it's guaranteed that `Device::set_drvdata()` has been called
	// and stored a `Pin<KBox<T>>`.
	let data = unsafe { pdev.as_ref().drvdata_obtain::<Pin<KBox<T>>>() };

	T::unbind(pdev, data.as_ref());
	}
	}

	impl<T: Driver + 'static> driver::Adapter for Adapter<T> {
	type IdInfo = T::IdInfo;

	fn of_id_table() -> Option<of::IdTable<Self::IdInfo>> {
	T::OF_ID_TABLE
	}

	fn acpi_id_table() -> Option<acpi::IdTable<Self::IdInfo>> {
	T::ACPI_ID_TABLE
	}
	}

	/// Declares a kernel module that exposes a single platform driver.
	///
	/// # Examples
	///
	/// ```ignore
	/// kernel::module_platform_driver! {
	/// type: MyDriver,
	/// name: "Module name",
	/// authors: ["Author name"],
	/// description: "Description",
	/// license: "GPL v2",
	/// }
	/// ```
	#[macro_export]
	macro_rules! module_platform_driver {
	($($f:tt)*) => {
	$crate::module_driver!(<T>, $crate::platform::Adapter<T>, { $($f)* });
	};
	}

	/// The platform driver trait.
	///
	/// Drivers must implement this trait in order to get a platform driver registered.
	///
	/// # Examples
	///
	///```
	/// # use kernel::{acpi, bindings, c_str, device::Core, of, platform};
	///
	/// struct MyDriver;
	///
	/// kernel::of_device_table!(
	/// OF_TABLE,
	/// MODULE_OF_TABLE,
	/// <MyDriver as platform::Driver>::IdInfo,
	/// [
	/// (of::DeviceId::new(c_str!("test,device")), ())
	/// ]
	/// );
	///
	/// kernel::acpi_device_table!(
	/// ACPI_TABLE,
	/// MODULE_ACPI_TABLE,
	/// <MyDriver as platform::Driver>::IdInfo,
	/// [
	/// (acpi::DeviceId::new(c_str!("LNUXBEEF")), ())
	/// ]
	/// );
	///
	/// 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>,
	/// _id_info: Option<&Self::IdInfo>,
	/// ) -> Result<Pin<KBox<Self>>> {
	/// Err(ENODEV)
	/// }
	/// }
	///```
	pub trait Driver: Send {
	/// The type holding driver private data about each device id supported by the driver.
	// TODO: Use associated_type_defaults once stabilized:
	//
	// ```
	// type IdInfo: 'static = ();
	// ```
	type IdInfo: 'static;

	/// The table of OF device ids supported by the driver.
	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.
	///
	/// Called when a new platform device is added or discovered.
	/// Implementers should attempt to initialize the device here.
	fn probe(dev: &Device<device::Core>, id_info: Option<&Self::IdInfo>)
	-> Result<Pin<KBox<Self>>>;

	/// Platform driver unbind.
	///
	/// Called when a [`Device`] is unbound from its bound [`Driver`]. Implementing this callback
	/// is optional.
	///
	/// This callback serves as a place for drivers to perform teardown operations that require a
	/// `&Device<Core>` or `&Device<Bound>` reference. For instance, drivers may try to perform I/O
	/// operations to gracefully tear down the device.
	///
	/// Otherwise, release operations for driver resources should be performed in `Self::drop`.
	fn unbind(dev: &Device<device::Core>, this: Pin<&Self>) {
	let _ = (dev, this);
	}
	}

	/// The platform device representation.
	///
	/// This structure represents the Rust abstraction for a C `struct platform_device`. The
	/// implementation abstracts the usage of an already existing C `struct platform_device` within Rust
	/// code that we get passed from the C side.
	///
	/// # Invariants
	///
	/// A [`Device`] instance represents a valid `struct platform_device` created by the C portion of
	/// the kernel.
	#[repr(transparent)]
	pub struct Device<Ctx: device::DeviceContext = device::Normal>(
	Opaque<bindings::platform_device>,
	PhantomData<Ctx>,
	);

	impl<Ctx: device::DeviceContext> Device<Ctx> {
	fn as_raw(&self) -> *mut bindings::platform_device {
	self.0.get()
	}

	/// Returns the resource at `index`, if any.
	pub fn resource_by_index(&self, index: u32) -> Option<&Resource> {
	// SAFETY: `self.as_raw()` returns a valid pointer to a `struct platform_device`.
	let resource = unsafe {
	bindings::platform_get_resource(self.as_raw(), bindings::IORESOURCE_MEM, index)
	};

	if resource.is_null() {
	return None;
	}

	// SAFETY: `resource` is a valid pointer to a `struct resource` as
	// returned by `platform_get_resource`.
	Some(unsafe { Resource::from_raw(resource) })
	}

	/// Returns the resource with a given `name`, if any.
	pub fn resource_by_name(&self, name: &CStr) -> Option<&Resource> {
	// SAFETY: `self.as_raw()` returns a valid pointer to a `struct
	// platform_device` and `name` points to a valid C string.
	let resource = unsafe {
	bindings::platform_get_resource_byname(
	self.as_raw(),
	bindings::IORESOURCE_MEM,
	name.as_char_ptr(),
	)
	};

	if resource.is_null() {
	return None;
	}

	// SAFETY: `resource` is a valid pointer to a `struct resource` as
	// returned by `platform_get_resource`.
	Some(unsafe { Resource::from_raw(resource) })
	}
	}

	impl Device<Bound> {
	/// Returns an `IoRequest` for the resource at `index`, if any.
	pub fn io_request_by_index(&self, index: u32) -> Option<IoRequest<'_>> {
	self.resource_by_index(index)
	// SAFETY: `resource` is a valid resource for `&self` during the
	// lifetime of the `IoRequest`.
	.map(\|resource\| unsafe { IoRequest::new(self.as_ref(), resource) })
	}

	/// Returns an `IoRequest` for the resource with a given `name`, if any.
	pub fn io_request_by_name(&self, name: &CStr) -> Option<IoRequest<'_>> {
	self.resource_by_name(name)
	// SAFETY: `resource` is a valid resource for `&self` during the
	// lifetime of the `IoRequest`.
	.map(\|resource\| unsafe { IoRequest::new(self.as_ref(), resource) })
	}
	}

	// SAFETY: `Device` is a transparent wrapper of a type that doesn't depend on `Device`'s generic
	// argument.
	kernel::impl_device_context_deref!(unsafe { Device });
	kernel::impl_device_context_into_aref!(Device);

	impl crate::dma::Device for Device<device::Core> {}

	// SAFETY: Instances of `Device` are always reference-counted.
	unsafe impl crate::types::AlwaysRefCounted for Device {
	fn inc_ref(&self) {
	// SAFETY: The existence of a shared reference guarantees that the refcount is non-zero.
	unsafe { bindings::get_device(self.as_ref().as_raw()) };
	}

	unsafe fn dec_ref(obj: NonNull<Self>) {
	// SAFETY: The safety requirements guarantee that the refcount is non-zero.
	unsafe { bindings::platform_device_put(obj.cast().as_ptr()) }
	}
	}

	impl<Ctx: device::DeviceContext> AsRef<device::Device<Ctx>> for Device<Ctx> {
	fn as_ref(&self) -> &device::Device<Ctx> {
	// SAFETY: By the type invariant of `Self`, `self.as_raw()` is a pointer to a valid
	// `struct platform_device`.
	let dev = unsafe { addr_of_mut!((*self.as_raw()).dev) };

	// SAFETY: `dev` points to a valid `struct device`.
	unsafe { device::Device::from_raw(dev) }
	}
	}

	impl<Ctx: device::DeviceContext> TryFrom<&device::Device<Ctx>> for &Device<Ctx> {
	type Error = kernel::error::Error;

	fn try_from(dev: &device::Device<Ctx>) -> Result<Self, Self::Error> {
	// SAFETY: By the type invariant of `Device`, `dev.as_raw()` is a valid pointer to a
	// `struct device`.
	if !unsafe { bindings::dev_is_platform(dev.as_raw()) } {
	return Err(EINVAL);
	}

	// SAFETY: We've just verified that the bus type of `dev` equals
	// `bindings::platform_bus_type`, hence `dev` must be embedded in a valid
	// `struct platform_device` as guaranteed by the corresponding C code.
	let pdev = unsafe { container_of!(dev.as_raw(), bindings::platform_device, dev) };

	// SAFETY: `pdev` is a valid pointer to a `struct platform_device`.
	Ok(unsafe { &*pdev.cast() })
	}
	}

	// SAFETY: A `Device` is always reference-counted and can be released from any thread.
	unsafe impl Send for Device {}

	// SAFETY: `Device` can be shared among threads because all methods of `Device`
	// (i.e. `Device<Normal>) are thread safe.
	unsafe impl Sync for Device {}