Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.)

From	Nish Aravamudan <nish.aravamudan@gmail.com>
Newsgroups	linux.kernel
Subject	Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.)
Date	2015-12-16 23:40 +0100
Message-ID	<qGsTM-7Lk-15@gated-at.bofh.it> (permalink)
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Hi,

On Wed, Dec 16, 2015 at 2:22 PM, Crt Mori <cmo@melexis.com> wrote:
> On 16 December 2015 at 22:41, Nish Aravamudan <nish.aravamudan@gmail.com> wrote:
>> Hi Daniel,
>>
>> On Wed, Dec 16, 2015 at 1:43 AM, Daniel Baluta <daniel.baluta@gmail.com> wrote:
>>> On Tue, Dec 15, 2015 at 9:19 PM, Nish Aravamudan
>>> <nish.aravamudan@gmail.com> wrote:
>>>> So, I apologize in advance for this relatively vague report, but I'm fairly sure
>>>> the Yoga 900 has an accelerometer amongst other sensors (ambient light?)
>>>> exported over IIO.
>>>>
>>>> But, these sensors seem to not be updating at all with a 4.4-rc5+ kernel (a
>>>> set of patches from https://lkml.org/lkml/2015/11/30/441 applied to Linus'
>>>> tree).
>>>>
>>>> The odd part is at some point in messing with this, I'm fairly sure it did work!
>>>> That is,
>>>>
>>>> `watch -n 0.1 cat '/sys/bus/iio/devices/iio:device'*/*raw*`
>>>
>>> Can you send us a sample of the output? Also, would be
>>> good to identify the exact driver for accel.
>>
>> cat /sys/bus/iio/devices/iio:device*/*raw*
>> 65478
>> 7
>> 1023
>> 0
>> 0
>> 0
>> 100
>> -539062
>> -742187
>> 1292968
>> 1592
>> 64932
>> 2
>> 275
>> 0 0 0 0
>>
>> Now, I should say that I distinctly remember at some point waving my
>> laptop around and seeing these values change ... but now they seem to
>> be "stuck". Maybe it's a hardware issue or something special that
>> WIndows does to leverage the IIO sensors?
>>
>>> Perhaps: cat /sys/bus/iio/devices/iio:device'*/name
>>
>> $ cat /sys/bus/iio/devices/iio:device*/name
>> accel_3d
>
> Can you list the directory of iio:device with this name (it is:
> drivers/iio/accel/hid-sensor-accel-3d.c).
> This is something you will be looking at for accel debugging, but it
> seems more like
> standard

/sys/bus/iio/devices/iio:device0/name
gyro_3d
/sys/bus/iio/devices/iio:device1/name
dev_rotation
/sys/bus/iio/devices/iio:device2/name
als
/sys/bus/iio/devices/iio:device3/name
magn_3d
/sys/bus/iio/devices/iio:device4/name
accel_3d
/sys/bus/iio/devices/iio:device5/name
incli_3d

are all the IIO sensors, sorry about that!

>> gyro_3d
>> als
>> magn_3d
>> incli_3d
>> dev_rotation
>>
>>
>>>>
>>>> showed updating values as I moved the laptop around.
>>>>
>>>> I've not done any accelerometer debugging before, so any suggestion on
>>>> where to start would be greatly appreciated!
>>>
>>> Did you applied some patches and recompiled the kernel? Or when it did stopped
>>> working?
>>
>> As far as I can tell, it only worked that one one time and hasn't
>> since. Although your question does make me wonder *which* kernel I was
>> on that I experienced the values changing. Let me go back to a stock
>> 4.4-rc5 and see.
>
> Did you compile the stock kernel? It might be that .dts file you are
> using (or defconfig)
> is not correct.

I compiled the stock kernel, based off the the Ubuntu 15.04 .config,
trimmed to account for the hardware I have on the system. I can attach
the .config if that will be useful.

I just went back to 4.4-rc4 and it also didn't seem to have any
updates to the raw file contents.

-Nish
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Thread

Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Nish Aravamudan <nish.aravamudan@gmail.com> - 2015-12-15 20:20 +0100
  Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Crt Mori <cmo@melexis.com> - 2015-12-16 10:40 +0100
    Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Nish Aravamudan <nish.aravamudan@gmail.com> - 2015-12-16 22:40 +0100
  Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Daniel Baluta <daniel.baluta@gmail.com> - 2015-12-16 10:50 +0100
    Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Nish Aravamudan <nish.aravamudan@gmail.com> - 2015-12-16 22:50 +0100
      Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Crt Mori <cmo@melexis.com> - 2015-12-16 23:30 +0100
        Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Nish Aravamudan <nish.aravamudan@gmail.com> - 2015-12-16 23:40 +0100
          Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Nish Aravamudan <nish.aravamudan@gmail.com> - 2015-12-17 00:10 +0100
            Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Nish Aravamudan <nish.aravamudan@gmail.com> - 2015-12-17 06:30 +0100
              Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Crt Mori <cmo@melexis.com> - 2015-12-17 09:50 +0100
                Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Nish Aravamudan <nish.aravamudan@gmail.com> - 2015-12-17 18:40 +0100
                Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Nish Aravamudan <nish.aravamudan@gmail.com> - 2015-12-17 19:20 +0100
                Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Crt Mori <cmo@melexis.com> - 2015-12-17 19:40 +0100
                Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Nish Aravamudan <nish.aravamudan@gmail.com> - 2015-12-17 21:10 +0100
                Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) Nish Aravamudan <nish.aravamudan@gmail.com> - 2015-12-17 21:40 +0100

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