linux-kernel - Re: [PATCH v3 15/24] media: Add userspace header file for i.MX

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Date:   Fri, 13 Jan 2017 15:13:33 -0800
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     robh+dt@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        kernel@...gutronix.de, fabio.estevam@....com,
        linux@...linux.org.uk, mchehab@...nel.org, hverkuil@...all.nl,
        nick@...anahar.org, markus.heiser@...marIT.de,
        laurent.pinchart+renesas@...asonboard.com, bparrot@...com,
        geert@...ux-m68k.org, arnd@...db.de, sudipm.mukherjee@...il.com,
        minghsiu.tsai@...iatek.com, tiffany.lin@...iatek.com,
        jean-christophe.trotin@...com, horms+renesas@...ge.net.au,
        niklas.soderlund+renesas@...natech.se, robert.jarzmik@...e.fr,
        songjun.wu@...rochip.com, andrew-ct.chen@...iatek.com,
        gregkh@...uxfoundation.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH v3 15/24] media: Add userspace header file for i.MX



On 01/13/2017 04:05 AM, Philipp Zabel wrote:
> Am Freitag, den 06.01.2017, 18:11 -0800 schrieb Steve Longerbeam:
>> This adds a header file for use by userspace programs wanting to interact
>> with the i.MX media driver. It defines custom v4l2 controls and events
>> generated by the i.MX v4l2 subdevices.
>>
>> Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
>> ---
>>   include/uapi/media/Kbuild |  1 +
>>   include/uapi/media/imx.h  | 30 ++++++++++++++++++++++++++++++
>>   2 files changed, 31 insertions(+)
>>   create mode 100644 include/uapi/media/imx.h
>>
>> diff --git a/include/uapi/media/Kbuild b/include/uapi/media/Kbuild
>> index aafaa5a..fa78958 100644
>> --- a/include/uapi/media/Kbuild
>> +++ b/include/uapi/media/Kbuild
>> @@ -1 +1,2 @@
>>   # UAPI Header export list
>> +header-y += imx.h
>> diff --git a/include/uapi/media/imx.h b/include/uapi/media/imx.h
>> new file mode 100644
>> index 0000000..2421d9c
>> --- /dev/null
>> +++ b/include/uapi/media/imx.h
>> @@ -0,0 +1,30 @@
>> +/*
>> + * Copyright (c) 2014-2015 Mentor Graphics Inc.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by the
>> + * Free Software Foundation; either version 2 of the
>> + * License, or (at your option) any later version
>> + */
>> +
>> +#ifndef __UAPI_MEDIA_IMX_H__
>> +#define __UAPI_MEDIA_IMX_H__
>> +
>> +/*
>> + * events from the subdevs
>> + */
>> +#define V4L2_EVENT_IMX_CLASS          V4L2_EVENT_PRIVATE_START
>> +#define V4L2_EVENT_IMX_NFB4EOF        (V4L2_EVENT_IMX_CLASS + 1)
>> +#define V4L2_EVENT_IMX_EOF_TIMEOUT    (V4L2_EVENT_IMX_CLASS + 2)
>> +#define V4L2_EVENT_IMX_FRAME_INTERVAL (V4L2_EVENT_IMX_CLASS + 3)
> Aren't these generic enough to warrant common events? I would think
> there have to be other capture IP cores that can signal aborted frames
> or frame timeouts.

Yes, agreed. A frame capture timeout, or frame interval error, are
both generic concepts. At some point it would be great to make the
Frame Interval Monitor generally available under v4l2-core. As for the
EOF timeout event, I'll look into moving that into a generic V4L2 event.

Steve