linux-kernel - Re: [PATCH] misc: add driver for Renesas R-Car Gyro-ADC/speed-pulse interfaces

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Message-ID: <51E25D6A.3090106@metafoo.de>
Date:	Sun, 14 Jul 2013 10:12:26 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
CC:	Arnd Bergmann <arnd@...db.de>,
	Greg KH <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org
Subject: Re: [PATCH] misc: add driver for Renesas R-Car Gyro-ADC/speed-pulse
 interfaces

On 07/14/2013 12:26 AM, Sergei Shtylyov wrote:
> Hello.
> 
> On 07/13/2013 11:58 AM, Arnd Bergmann wrote:
> 
>>>> And are you sure you want to control this through sysfs?  There's no
>>>> other better user/kernel apis for it?
> 
>>>      I found none, besides ioctl(), as the device driven is rather
>>> unique. But I thought that sysfs is "ioctl() today", so I went with it...
> 
>> It does sound like it would fit better into IIO than just a misc driver,
>> even if it's the only hardware of its kind.
> 
>    I got somewhat familiarized myself with drivers/iio/ infrastructure and I
> have found a place only the for ADC device in which the customer currently
> has no interest.
>    The other trouble is that I'll have to backport this driver to 3.4 which
> doesn't contain the IIO infrastructure at all. :-(

It has, it's just still in staging in 3.4. But the API (except for minor
modifications) and more importantly the ABI are the same.

There is a angular velocity channel type in IIO. maybe that could be used to
report the Speed-Pulse-ADC values.

- Lars

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