Re: [RFC PATCH] rust: hwmon: add basic hwmon abstractions

[Guenter Roeck <linux@roeck-us.net>]

On 5/12/26 08:57, Donjuanplatinum wrote:
> Add a minimal Rust abstraction for the Hardware Monitoring (hwmon)
> subsystem.
> 
> Currently, this abstraction supports a Minimum Viable Product (MVP) scope:
> registering a single temperature sensor with the read-only `temp1_input`
> attribute. Support for multi-channel, additional sensor types, and
> writable attributes is deferred to future patches to keep this initial
> foundation reviewable.
> 
> The primary architectural challenge in wrapping hwmon is initializing
> `struct hwmon_chip_info`, which requires stable, self-referential
> pointers to nested NULL-terminated arrays. Instead of relying on complex
> macro generation for static allocation, this implementation leverages
> a single heap allocation (`KBox`). It safely wires the self-referential
> raw pointers using unaliased `&raw mut` during the allocation's
> exclusive ownership phase, and then securely seals it by pinning
> (`Pin::new_unchecked`).
> 
> For resource management, this implementation uses standard Rust RAII
> (calling `hwmon_device_unregister` in `Drop`) rather than `devm_`
> variants, ensuring natural drop ordering and avoiding complex C-side
> trampolines for generic types.
> 
> Signed-off-by: Donjuanplatinum <donplat@barrensea.org>

Sorry, rust support in the hardware monitoring subsystem will have to wait
for someone else to pick up maintainership.

Guenter