[PATCH v3 3/3] rust: pci: provide access to PCI Vendor values

[Danilo Krummrich]

On Tue Aug 19, 2025 at 5:11 AM CEST, John Hubbard wrote:
> +/// PCI vendor IDs.
> +///
> +/// Each entry contains the 16-bit PCI vendor ID as assigned by the PCI SIG.
> +///
> +/// # Examples
> +///
> +/// ```
> +/// # use kernel::{device::Core, pci::{self, Vendor}, prelude::*};
> +/// fn probe_device(pdev: &pci::Device<Core>) -> Result<()> {
> +///     // Validate vendor ID
> +///     let vendor = Vendor::try_from(pdev.vendor_id() as u32)?;

Why not change vendor_id() to return a Vendor instance directly?

> +///     dev_info!(
> +///         pdev.as_ref(),
> +///         "Detected vendor ID: (0x{:04x})\n",
> +///         vendor.as_u32()
> +///     );
> +///     Ok(())
> +/// }
> +/// ```
> +#[derive(Debug, Clone, Copy, PartialEq, Eq)]
> +#[repr(transparent)]
> +pub struct Vendor(u32);

[ Vendor impl and lots of ids... ]

Same as for Class; probably better to move it to its own module.

We could also move both Class and Vendor into a single module, e.g. id.rs and
keep the module prefix. This would have the advantage that we could have
pci::id::Class, pci::id::Vendor and pci::id::Device (which, eventually, we want
as well), without getting a name conflict with pci::Device.