linux-kernel - Re: [PATCH 2/2] gpio: sch: Add interrupt support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 26 Apr 2019 20:20:19 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jan Kiszka <jan.kiszka@...mens.com>
Cc:     "Enrico Weigelt, metux IT consult" <lkml@...ux.net>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH 2/2] gpio: sch: Add interrupt support

On Fri, Apr 26, 2019 at 7:05 PM Jan Kiszka <jan.kiszka@...mens.com> wrote:
>
> On 26.04.19 16:42, Enrico Weigelt, metux IT consult wrote:
> > On 26.04.19 15:36, Jan Kiszka wrote:
> >
> >> At the same time, there are no real alternatives - to my> knowledge - for the value it brings (various bindings) to simply
> > switch> the engine.
> > Which value exactly does that collection of crude wrappers and broken
> > attempts to buypass the kernel (driving gpios via /dev/mem *facepalm*)
> > provide ?
>
> Leaving that blunt hack aside:
>
> import mraa
>
> pin = mraa.Gpio(13)
> pin.dir(mraa.DIR_OUT)
> pin.write(1)
>
> And the same goes for nodejs, java and c++.
>
> Moreover, this allows you to abstract away where "Pin 13" actually came from on
> that board if the kernel changes (BSP -> upstream...) or the extension board or
> ...

The problem here is opaque number. This has to be chip + *relative* pin number/
See this:
https://stackoverflow.com/questions/55532410/how-do-linux-gpio-numbers-get-their-values/55579640#55579640

-- 
With Best Regards,
Andy Shevchenko