Messages in this thread | | | From | Linus Walleij <> | Date | Tue, 12 May 2020 19:55:42 +0200 | Subject | Re: [PATCH] gpiolib: add GPIO_SET_DEBOUNCE_IOCTL |
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On Mon, May 4, 2020 at 12:32 PM Bartosz Golaszewski <brgl@bgdev.pl> wrote:
> Ideally we'd have to introduce new versions of gpioevent_request, > gpioline_request, gpioline_info and gpioevent_data structs - this time > with enough additional padding and no alignment issues. Then we could > add the debounce properly.
Hm that sounds massive. Is it really that bad?
> This would of course add a lot of cruft to the uAPI code. I'd start by > moving it out of drivers/gpio/gpiolib.c into a new file: > drivers/gpio/gpiolib-cdev.c. This way we'd have everything related to > the character device in one place. It would make it easier to: a) add > a config option for disabling it entirely and b) add a config option > to disable the v1 of the ioctl()s.
Its good to break out for code maintenance no matter what we do with it :)
I would however not make it in any way totally optional, because the big win with the character device over the legacy sysfs is to always be available.
> Linus: about the software-debounce you mentioned: do you think it > somehow plugs the hole we identified here?
Hm, I don't quite understand what the hole is I guess...
Linus
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