Re: [PATCH v6 1/2] rust: regulator: add a bare minimum regulator abstraction

[Daniel Almeida <daniel.almeida@collabora.com>]

> 
>>>> +impl<T: RegulatorState + 'static> Drop for Regulator<T> {
>>>> +    fn drop(&mut self) {
>>>> +        if core::any::TypeId::of::<T>() == core::any::TypeId::of::<Enabled>() {
>>> 
>>> I would avoid this kind of logic. Instead, you can add an
>>> `disable_on_drop()` method or constant to the trait and check it here.
>>> 
>>> Alice
>>> 
>> 
>> Can you expand on this?
> 
> Along these lines:
> 
> pub trait RegulatorState: 'static {
>    const DISABLE_ON_DROP: bool;
> }
> 
> impl RegulatorState for Enabled {
>    const DISABLE_ON_DROP: bool = true;
> }
> impl RegulatorState for Disabled {
>    const DISABLE_ON_DROP: bool = false;
> }
> impl RegulatorState for Dynamic {
>    const DISABLE_ON_DROP: bool = false;
> }
> 
> impl<T: RegulatorState> Drop for Regulator<T> {
>    fn drop(&mut self) {
>        if T::DISABLE_ON_DROP {
>            unsafe { bindings::regulator_disable(self.inner.as_ptr()) };
>        }
>        unsafe { bindings::regulator_put(self.inner.as_ptr()) };
>    }
> }

Ah, that indeed looks better, thanks.

— Daniel