From: Jonathan Cameron <jic23@cam.ac.uk>
To: malas <malas@tcoe.iitm.ac.in>
Cc: linux-iio@vger.kernel.org
Subject: Re: ad7793 iio-ring test read issue - Reg
Date: Tue, 23 Aug 2011 12:21:25 +0100 [thread overview]
Message-ID: <4E538D35.7090508@cam.ac.uk> (raw)
In-Reply-To: <20110823080829.M36921@tcoe.iitm.ac.in>
On 08/23/11 09:18, malas wrote:
>
> Dear Michael Hennerich,
>
>
> I shall post iio quesris in this mail list as per your suggestions.
>
> AD7793 driver is built into kernel. The chip gets configured and am able to read data on
> continuous mode via spi interface using ad7793 driver at kernel level.
>
> While testing userspace test iio-ring to read data from ring buffer, generic_buffer code
> was executed, it proceeds till opening /sys/bus/iio/devices/device0:buffer0 and
> Read call fails.
Question 1: What's the kernel and where did you get it from? (Interfaces are moving
fast so it's plausible you've fallen in a hole where userspace wasn't matching kernelspace).
>
> In fs I can list the iio device ad7793 with following properties get/set.
>
> root:/> ls /sys/bus/iio/devices/device0\:buffer0/
> bytes_per_datum enable power subsystem
> dev length scan_elements uevent
> root:/>
>
> I find access0 and event0 missing in this list. Is that the reason for read() fails.
Yes. Question is why and without kernel version I don't know where to look I'm afraid.
>
> Please help.
>
> Thanks
> Mala
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next prev parent reply other threads:[~2011-08-23 11:13 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-23 8:18 ad7793 iio-ring test read issue - Reg malas
2011-08-23 11:21 ` Jonathan Cameron [this message]
2011-08-23 11:25 ` malas
2011-08-23 11:39 ` Hennerich, Michael
2011-08-23 12:17 ` malas
2011-08-23 12:39 ` Jonathan Cameron
2011-08-23 12:43 ` malas
2011-08-23 12:58 ` Jonathan Cameron
2011-08-23 13:24 ` malas
2011-08-23 13:41 ` Jonathan Cameron
2011-08-23 13:48 ` malas
2011-08-23 14:07 ` Jonathan Cameron
2011-08-23 14:14 ` malas
2011-08-23 14:30 ` Hennerich, Michael
2011-08-23 14:33 ` malas
2011-08-23 14:53 ` malas
2011-08-23 15:03 ` Michael Hennerich
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