linux-kernel - Re: [RFC PATCH] iio: Export userspace IIO headers

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Message-ID: <CAEnQRZBWRmWcSe1izK7cEikwfG_oAEty05eCQXxWr71=8jbDEw@mail.gmail.com>
Date:	Tue, 10 Feb 2015 10:05:06 +0200
From:	Daniel Baluta <daniel.baluta@...el.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Daniel Baluta <daniel.baluta@...el.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Irina Tirdea <irina.tirdea@...el.com>,
	Roberta Dobrescu <roberta.dobrescu@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	linux-api@...r.kernel.org
Subject: Re: [RFC PATCH] iio: Export userspace IIO headers

On Mon, Feb 9, 2015 at 7:05 PM, Lars-Peter Clausen <lars@...afoo.de> wrote:
> On 02/09/2015 05:49 PM, Daniel Baluta wrote:
>>
>> After UAPI header file split [1] all user-kernel interfaces were
>> placed under include/uapi/.
>>
>> This patch moves IIO user specific API from:
>>         * include/linux/iio/events.h => include/uapi/linux/iio/events.h
>>         * include/linux/iio/types.h => include/uapi/linux/iio/types.h
>>
>> Now there is no need for nasty tricks to compile userspace programs
>> (e.g iio_event_monitor). Just installing the kernel headers with
>> make headers_install command does the job.
>>
>> [1] http://lwn.net/Articles/507794/
>
>
> Thanks for taking care of this, this is something that should have done a
> while ago.

Hi Lars,

Thanks for the feedback!
>
> [...]
>
>> index 580ed5b..146cda1 100644

<snip>

>
>
> I think everything in this file below is not part of the ABI and should not
> be exported to userspace.

I agree about iio_event_info and IIO_VAL_* constants.

>
>> -
>> -enum iio_event_info {
>> -       IIO_EV_INFO_ENABLE,
>> -       IIO_EV_INFO_VALUE,
>> -       IIO_EV_INFO_HYSTERESIS,
>> -       IIO_EV_INFO_PERIOD,
>> -};
>> -
>> -enum iio_event_direction {
>> -       IIO_EV_DIR_EITHER,
>> -       IIO_EV_DIR_RISING,
>> -       IIO_EV_DIR_FALLING,
>> -       IIO_EV_DIR_NONE,
>> -};

iio_event_direction is exported to userspace via IIO_EVENT_CODE and
I think it belongs to this file.

>> -
>> -#define IIO_VAL_INT 1
>> -#define IIO_VAL_INT_PLUS_MICRO 2
>> -#define IIO_VAL_INT_PLUS_NANO 3
>> -#define IIO_VAL_INT_PLUS_MICRO_DB 4
>> -#define IIO_VAL_INT_MULTIPLE 5
>> -#define IIO_VAL_FRACTIONAL 10
>> -#define IIO_VAL_FRACTIONAL_LOG2 11
>> -

I will send v2 in few hours, hopefully I'll get more feedback meanwhile.

Do you thing should I remove the RFC tag?

thanks,
Daniel.
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