linux-kernel - Re: [PATCH v3 01/11] docs: ioctl-number.rst: reserve IIO subsystem ioctl() space

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Date:   Fri, 5 Feb 2021 09:08:44 +0200
From:   Alexandru Ardelean <ardeleanalex@...il.com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc:     Alexandru Ardelean <alexandru.ardelean@...log.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-iio <linux-iio@...r.kernel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Nuno Sá <nuno.sa@...log.com>,
        "Bogdan, Dragos" <dragos.bogdan@...log.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v3 01/11] docs: ioctl-number.rst: reserve IIO subsystem
 ioctl() space

On Thu, Feb 4, 2021 at 7:13 PM Jonathan Cameron
<Jonathan.Cameron@...wei.com> wrote:
>
> On Mon, 1 Feb 2021 16:50:55 +0200
> Alexandru Ardelean <alexandru.ardelean@...log.com> wrote:
>
> > Currently, only the 'i' 0x90 ioctl() actually exists and is defined in
> > 'uapi/linux/iio/events.h'.
> >
> > It's the IIO_GET_EVENT_FD_IOCTL, which is used to retrieve and FD for
> > reading events from an IIO device.
> > We will want to add more ioct() numbers, so with this change the 'i'
> > 0x90-0x9F space is reserved for IIO ioctl() calls.
> >
> > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> Hi Alex,
>
> Thanks for tidying this up.  My bad from a long time ago to not register
> this at the time.
>
> > ---
> >  Documentation/userspace-api/ioctl/ioctl-number.rst | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst
> > index a4c75a28c839..9ebde26b7e32 100644
> > --- a/Documentation/userspace-api/ioctl/ioctl-number.rst
> > +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
> > @@ -245,6 +245,7 @@ Code  Seq#    Include File                                           Comments
> >  'i'   00-3F  linux/i2o-dev.h                                         conflict!
> >  'i'   0B-1F  linux/ipmi.h                                            conflict!
> >  'i'   80-8F  linux/i8k.h
> > +'i'   90-9F  `uapi/linux/iio/*.h`                                    IIO
>
> I think the uapi/ bit is effectively implicit. I checked a few of them and the
> definitions are in uapi/linux/

ack

>
> >  'j'   00-3F  linux/joystick.h
> >  'k'   00-0F  linux/spi/spidev.h                                      conflict!
> >  'k'   00-05  video/kyro.h                                            conflict!
>