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From: Drew Fustini <pdp7pdp7@gmail.com>
To: Kent Gibson <warthog618@gmail.com>
Cc: Bartosz Golaszewski <brgl@bgdev.pl>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	Linus Walleij <linus.walleij@linaro.org>
Subject: Re: [RFC] gpio: expose pull-up/pull-down line flags to userspace
Date: Thu, 10 Oct 2019 09:47:35 +0200
Message-ID: <CAEf4M_D4C2v87XR7oyc4YLN9j9XhSctJcw1NCt8hPcuf0P_=DA@mail.gmail.com> (raw)
In-Reply-To: <20191009235938.GA10263@sol>

On Thu, Oct 10, 2019 at 1:59 AM Kent Gibson <warthog618@gmail.com> wrote:
> It is basically working for me on my Pi4:
>
> pi@quoll:~ $ ./gpiodctl get gpiochip0 7
> 0
> pi@quoll:~ $ ./gpiodctl get -u gpiochip0 7
> 1
> pi@quoll:~ $ ./gpiodctl get gpiochip0 7
> 1
> pi@quoll:~ $ ./gpiodctl get -d gpiochip0 7
> 0
> pi@quoll:~ $ ./gpiodctl get gpiochip0 7
> 0
>
> That is using the gpiodctl tool from my gpiod library.
> My gpiod test suite also passes, but it doesn't do much to
> exercise the UAPI.
> I was intending to run my uapi test suite, which is more thorough,
> but it turns out that only targets gpio-mockup, whereas my gpiod
> test suite can target either.
> Something else for the todo list.
>
> Hopefully it is obvious what gpiodctl is doing. (-u sets the
> pull-up flag, -d sets the pull-down flag)
> Looks like the pulls stick when the line is released, and the
> subsequent get, without pull-up set, either doesn't clear the
> pull-up/down or the line stays floating at the old pull level.
> More investigation required, but that will have to wait til
> I get back to this later in the day.
>
> Oh, and that is running on the rpi-5.3.3 kernel patched with everything
> on my topic/gpio-uapi-config branch from 5.4-rc2 onward.

Thanks for sharing your results.

My Pi 3 had been running 5.3.0-v7+ from September 20th with my
pull-up/down patch (82fc38f6ab59).

I removed that patch and just cross-compiled 5.4-rc2 with
multi_v7_defconfig for the Pi3.

Are these the commits that I should apply from your topic branch?

bdc9696a27ed pull up/down requires explicit input mode in lineevent_create
14ee636232d4 disallow pull up/down on outputs
ce03bf5af1ec implement SET_CONFIG_IOCTL
f38b7554eb52 pull common validation code into linehandle_validate_flags
31c0aa53ffc3 Add default values for setting output
3c7ec03efcd9 add support for pull up/down to lineevent_create
99b85d1c26ea gpio: add new ioctl() to gpio chardev
82fc38f6ab59 gpio: expose pull-up/pull-down line flags to userspace
f6cfbbe2950b gpiolib: sanitize flags before allocating memory in
lineevent_create()

Thanks,
Drew

  reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-21 10:25 Drew Fustini
2019-09-23  8:38 ` Bartosz Golaszewski
2019-10-02 11:10   ` Drew Fustini
2019-10-03 12:47   ` Linus Walleij
2019-10-04  7:22     ` Bartosz Golaszewski
2019-10-04 12:46       ` Bartosz Golaszewski
2019-10-05 17:02       ` Linus Walleij
2019-10-06  3:12         ` Kent Gibson
2019-10-06 21:06           ` Linus Walleij
2019-10-07  4:37             ` Kent Gibson
2019-10-08  6:15 ` Kent Gibson
2019-10-08 20:56   ` Bartosz Golaszewski
2019-10-08 23:21     ` Kent Gibson
2019-10-08 23:30       ` Bartosz Golaszewski
2019-10-08 23:56         ` Kent Gibson
2019-10-09  0:03           ` Bartosz Golaszewski
2019-10-09  0:22             ` Kent Gibson
2019-10-09  6:55               ` Kent Gibson
2019-10-09 12:57                 ` Drew Fustini
2019-10-09 13:23                   ` Kent Gibson
2019-10-09 13:30                 ` Drew Fustini
2019-10-09 14:11                   ` Kent Gibson
2019-10-09 15:50                     ` Bartosz Golaszewski
2019-10-09 16:19                       ` Kent Gibson
2019-10-09 23:59                   ` Kent Gibson
2019-10-10  7:47                     ` Drew Fustini [this message]
2019-10-10 10:14                       ` Kent Gibson
2019-10-10 11:17                         ` Kent Gibson
2019-10-11 13:04                           ` Drew Fustini
2019-10-11 13:06                         ` Drew Fustini
2019-10-11 13:49                           ` Kent Gibson
2019-10-09 11:32               ` Drew Fustini
2019-10-09 13:57       ` Drew Fustini
2019-10-09 14:01         ` Kent Gibson
2019-10-09 11:46   ` Drew Fustini

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