linux-kernel - Re: iio/hid-sensor-accel-3d: no output from /dev/iio:device*?

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Message-ID: <1450457824.3958.9.camel@intel.com>
Date:	Fri, 18 Dec 2015 16:58:53 +0000
From:	"Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>
To:	"nish.aravamudan@...il.com" <nish.aravamudan@...il.com>
CC:	"lars@...afoo.de" <lars@...afoo.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"knaack.h@....de" <knaack.h@....de>,
	"jic23@...nel.org" <jic23@...nel.org>,
	"cmo@...exis.com" <cmo@...exis.com>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"pmeerw@...erw.net" <pmeerw@...erw.net>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"jikos@...nel.org" <jikos@...nel.org>,
	"Shevchenko, Andriy" <andriy.shevchenko@...el.com>
Subject: Re: iio/hid-sensor-accel-3d: no output from /dev/iio:device*?

On Thu, 2015-12-17 at 19:06 -0800, Nish Aravamudan wrote:
> On Thu, Dec 17, 2015 at 6:50 PM, Pandruvada, Srinivas
> <srinivas.pandruvada@...el.com> wrote:
> > On Thu, 2015-12-17 at 18:33 -0800, Nish Aravamudan wrote:
> > > On Thu, Dec 17, 2015 at 5:11 PM, Pandruvada, Srinivas
> > > <srinivas.pandruvada@...el.com> wrote:
> > > > On Thu, 2015-12-17 at 17:08 -0800, Nish Aravamudan wrote:
> > > > > On Thu, Dec 17, 2015 at 5:00 PM, Pandruvada, Srinivas
> > > > > <srinivas.pandruvada@...el.com> wrote:
> > > > > > Hi Andy,
> > > > > > 
> > > > > > As per Nish these patches are impacting sensors on Yoga.
> > > > > > https://lkml.org/lkml/2015/11/30/441
> > > > > 
> > > > > To be clear, without that series, the touchpad and
> > > > > touchscreen on
> > > > > the
> > > > > Yoga 900 don't work at all. So they are necessary for
> > > > > functioning. I
> > > > > don't know (I will test it now), if removing the series makes
> > > > > the
> > > > > IIO
> > > > > sensors work properly in /dev/.
> > > > This is important to know before we take Andy's time.
> > > 
> > > It seems like Andy's patches are not the problem. That is, with
> > > stock
> > > 4.4-rc5, the accelerommeter /dev files still do not update.
> > > 
> > Can you not use raw values by polling from user space? Send me
> > report description. It should be in
> > /sys/kernel/debug/hid/ "your device id" /redesc.
> 
> The underlying issue is that iio-sensor-proxy relies on values from
> the corresponding /dev nodes to automatically rotate the screen, etc.
> in the desktop environment.
> 
> Attached due to its size.
> 
> > Also device id ("your device id") above.
> 
> 0018:048D:8396.0002
Sent a patch, try and see if this works.

Thanks,
Srinivas

> 
> -Nish