[PATCH v2 3/3] rust: pci: provide access to PCI Vendor values

[Danilo Krummrich]

On Mon Aug 18, 2025 at 3:33 AM CEST, John Hubbard wrote:
> +            /// Create a `Vendor` from the raw vendor ID value, or `None` if the value doesn't
> +            /// match any known vendor.
> +            pub fn from_u32(value: u32) -> Option<Self> {
> +                match value {
> +                    $(x if x == Self::$variant.0 => Some(Self::$variant),)+
> +                    _ => None,
> +                }
> +            }

Same here, I think this should be `impl TryFrom<u32> for Vendor`.

> +
> +            /// Get the raw 16-bit vendor ID value.
> +            pub const fn as_u32(self) -> u32 {
> +                self.0
> +            }
> +        }
> +    };
> +}

>  /// An adapter for the registration of PCI drivers.
>  pub struct Adapter<T: Driver>(T);
>  
> @@ -335,9 +656,9 @@ pub const fn from_class(class: u32, class_mask: u32) -> Self {
>      ///
>      /// This is more targeted than [`DeviceId::from_class`]: in addition to matching by Vendor, it
>      /// also matches the PCI Class (up to the entire 24 bits, depending on the mask).
> -    pub const fn from_class_and_vendor(class: Class, class_mask: u32, vendor: u32) -> Self {
> +    pub const fn from_class_and_vendor(class: Class, class_mask: u32, vendor: Vendor) -> Self {
>          Self(bindings::pci_device_id {
> -            vendor,
> +            vendor: vendor.as_u32(),
>              device: DeviceId::PCI_ANY_ID,
>              subvendor: DeviceId::PCI_ANY_ID,
>              subdevice: DeviceId::PCI_ANY_ID,
> @@ -396,7 +717,7 @@ macro_rules! pci_device_table {
>  ///     <MyDriver as pci::Driver>::IdInfo,
>  ///     [
>  ///         (
> -///             pci::DeviceId::from_id(bindings::PCI_VENDOR_ID_REDHAT, bindings::PCI_ANY_ID as u32),
> +///             pci::DeviceId::from_id(pci::Vendor::REDHAT.as_u32(), bindings::PCI_ANY_ID as u32),

We should change DeviceId::from_id() to consume a pci::Vendor value directly.