From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
To: Lars-Peter Clausen <lars@metafoo.de>
Cc: Arnd Bergmann <arnd@arndb.de>,
Greg KH <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org, linux-sh@vger.kernel.org
Subject: Re: [PATCH] misc: add driver for Renesas R-Car Gyro-ADC/speed-pulse interfaces
Date: Sun, 14 Jul 2013 23:57:24 +0400 [thread overview]
Message-ID: <51E302A4.6080801@cogentembedded.com> (raw)
In-Reply-To: <51E25D6A.3090106@metafoo.de>
Hello.
On 07/14/2013 12:12 PM, Lars-Peter Clausen 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.
Thank you for the useful information. I wouldn't probably have
figured it out to search there.
> There is a angular velocity channel type in IIO. maybe that could be used to
> report the Speed-Pulse-ADC values.
You probably misunderstood from my terse description. Multichannel
ADC interface is separate from the speed-pulse interface which has on
its single input digital PWM signal of varying frequency. Speed pulse
i/f measures pulse count and period. I've found no adequate channel type
in IIO infrastructure so far. I'll mail the IIO maintainers with a
request for help probably...
> - Lars
WBR, Sergei
prev parent reply other threads:[~2013-07-14 19:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-12 23:51 [PATCH] misc: add driver for Renesas R-Car Gyro-ADC/speed-pulse interfaces Sergei Shtylyov
2013-07-13 0:57 ` Greg KH
2013-07-13 1:15 ` Sergei Shtylyov
2013-07-13 1:30 ` Greg KH
2013-07-13 22:44 ` Sergei Shtylyov
2013-07-13 7:58 ` Arnd Bergmann
2013-07-13 22:26 ` Sergei Shtylyov
2013-07-13 23:17 ` Greg KH
2013-07-14 8:12 ` Lars-Peter Clausen
2013-07-14 19:57 ` Sergei Shtylyov [this message]
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