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fd3b87ff02
Add a registration_data pointer to struct auxiliary_device, allowing the registering (parent) driver to attach private data to the device at registration time and retrieve it later when called back by the auxiliary (child) driver. By tying the data to the device's registration, Rust drivers can bind the lifetime of device resources to it, since the auxiliary bus guarantees that the parent driver remains bound while the auxiliary device is bound. On the Rust side, Registration<T> takes ownership of the data via ForeignOwnable. A TypeId is stored alongside the data for runtime type checking, making Device::registration_data<T>() a safe method. Reviewed-by: Alice Ryhl <aliceryhl@google.com> Link: https://patch.msgid.link/20260505152400.3905096-3-dakr@kernel.org Signed-off-by: Danilo Krummrich <dakr@kernel.org>