Re: [PATCH] platform/x86: asus-wmi: Clamp keyboard backlight level from hotkeys

[Denis Benato <benato.denis96@gmail.com>]

On 10/25/26 06:46, alex@bogusta.com wrote:
> Hi Denis, 
> thanks for the review!
>
> On Monday, October 19th, 2026 at 5:52 PM, Denis Benato <denis.benato@linux.dev> wrote:
>
>> Is the change of type really necessary? I think clamp_value does everything required already.
> Hi Denis, thanks for the reply,
>
> clamp_val() without the type change wouldn't fix the problem, as
> at level 0, led_value - 1 is an unsigned type and wraps around. clamp_val() then clamps this to 3, setting the leds to max
> brightness
>
>> Honestly I don't like the change of type... I would prefer something that prevents the
>> bad thing from happening without changing the type.
> My reasoning for int was consistency, as asus_hid_event() and
> do_kbd_led_set() already do this arithmetic as int, and the comment
> on enum led_brightness in leds.h describes it as obsolete.
>
> That said, if you prefer keeping the enum, one could avoid the
> wraparound instead with the call
>
> 	kbd_led_set_by_kbd(asus, led_value ? led_value - 1 : 0);
>
> and keep the clamp in kbd_led_set_by_kbd() for the upper bound.

I see where this is going: either math done on an enum or an int converted to an enum.

I personally like neither, but any of the two will do to get the issue solved, so... If you happen
to make another version please add a comment somewhere to outline it so nobody gets the idea of
making the code looks better at the expense of functionality. Either with that comment or not:

Reviewed-by: Denis Benato <denis.benato@linux.dev>

> Thanks,
> Alex

Best regards,
Denis Benato