linux-kernel - Re: [RFC 0/4] Intel Integrated Sensor Hub Support (ISH)

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Date:	Tue, 14 Jun 2016 17:12:03 +0200
From:	Bastien Nocera <hadess@...ess.net>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Jiri Kosina <jikos@...nel.org>, benjamin.tissoires@...hat.com,
	Jonathan Cameron <jic23@...nel.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	linux-iio@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	chaya.golan@...el.com, daniel.drubin@...el.com,
	Darren Hart <darren@...art.com>
Subject: Re: [RFC 0/4] Intel Integrated Sensor Hub Support (ISH)

On Tue, 2016-06-14 at 14:44 +0100, Grant Likely wrote:
> On Fri, Jun 10, 2016 at 4:27 PM, Bastien Nocera <hadess@...ess.net>
> wrote:
> > On Fri, 2016-06-10 at 08:23 -0700, Srinivas Pandruvada wrote:
> > > On Fri, 2016-06-10 at 17:04 +0200, Bastien Nocera wrote:
> > > > > 
> > > 
> > > [...]
> > > 
> > > > Are there any errors when setting the triggers?
> > > > 
> > > Is there any debug option in this service to give more verbose
> > > output?
> > 
> > Add:
> > Environment="G_MESSAGES_DEBUG=all"
> > 
> > To the service file. You should see the debug in systemctl:
> > systemctl status iio-sensor-proxy.service
> > 
> > Or in journalctl if there's too much data:
> > journalctl --reverse -u iio-sensor-proxy.service
> 
> Still no joy on the sensors. The proxy starts up and detects the
> sensors, but I don't see any sensor events occurring:

Could you try again with the current master of iio-sensor-proxy? Make
sure to install the file in the same location as in your distro
provided package.

I've added more debug/warnings to a few cases where it would have
silently failed in the past.

In particular, I don't see any messages that would be coming out of:
https://github.com/hadess/iio-sensor-proxy/blob/master/src/iio-buffer-utils.c#L512

Could it be that the sub-directory is populated after the device is
created in the kernel, causing a race?

Either that, or the contents of the scan_elements/ directory is not the
one expected by this code.

The output of this command should us that:
ls /sys/devices/pci0000:00/0000:00:13.0/{33AECD58-B679-4E54-9BD9-A04D34F0C226}/001E:8086:22D8.0001/HID-SENSOR-200073.8.auto/iio:device1/scan_elements

Cheers