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Message-ID: <CAOhV88NrU1cXiMXkCpuZbGGkFiOet_ZxotusdZD5rA+76cyspw@mail.gmail.com> Date: Wed, 16 Dec 2015 21:27:38 -0800 From: Nish Aravamudan <nish.aravamudan@...il.com> To: Crt Mori <cmo@...exis.com> Cc: Hartmut Knaack <knaack.h@....de>, Peter Meerwald <pmeerw@...erw.net>, Daniel Baluta <daniel.baluta@...il.com>, "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>, Lars-Peter Clausen <lars@...afoo.de>, Jonathan Cameron <jic23@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: Issues with Lenovo Yoga 900 IIO devices (accelerometer, etc.) On Wed, Dec 16, 2015 at 3:05 PM, Nish Aravamudan <nish.aravamudan@...il.com> wrote: > On Wed, Dec 16, 2015 at 2:55 PM, Crt Mori <cmo@...exis.com> wrote: >> >> On Dec 16, 2015 11:37 PM, "Nish Aravamudan" <nish.aravamudan@...il.com> >> wrote: >>> >>> Hi, >>> >>> On Wed, Dec 16, 2015 at 2:22 PM, Crt Mori <cmo@...exis.com> wrote: >>> > On 16 December 2015 at 22:41, Nish Aravamudan >>> > <nish.aravamudan@...il.com> wrote: >>> >> Hi Daniel, >>> >> >>> >> On Wed, Dec 16, 2015 at 1:43 AM, Daniel Baluta >>> >> <daniel.baluta@...il.com> wrote: >>> >>> On Tue, Dec 15, 2015 at 9:19 PM, Nish Aravamudan >>> >>> <nish.aravamudan@...il.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! >>> >> >> I was more thinking what else is in iio:device4 directory, so that we can >> see if it was initialized OK. Can you also grep the dmesg for any errors? > > Well, I just noticed the device #s are not consistent boot-to-boot, so > this time it was device0. Trimming out the directories: > > /sys/bus/iio/devices/iio:device0/buffer > cat: /sys/bus/iio/devices/iio:device0/buffer: Is a directory > /sys/bus/iio/devices/iio:device0/dev > 250:0 > /sys/bus/iio/devices/iio:device0/in_accel_hysteresis > cat: /sys/bus/iio/devices/iio:device0/in_accel_hysteresis: Invalid argument > /sys/bus/iio/devices/iio:device0/in_accel_offset > 0 > /sys/bus/iio/devices/iio:device0/in_accel_sampling_frequency > 8.000000 > /sys/bus/iio/devices/iio:device0/in_accel_scale > 0.009806 > /sys/bus/iio/devices/iio:device0/in_accel_x_raw > 65478 > /sys/bus/iio/devices/iio:device0/in_accel_y_raw > 7 > /sys/bus/iio/devices/iio:device0/in_accel_z_raw > 1023 > /sys/bus/iio/devices/iio:device0/name > accel_3d > /sys/bus/iio/devices/iio:device0/uevent > MAJOR=250 > MINOR=0 > DEVNAME=iio:device0 > DEVTYPE=iio_device > > Another thing I just noticed: > > /sys/bus/iio/devices/iio:device0/buffer/enable > 0 > > The only error I'm getting consistently is: > > [ 1.115327] i2c_hid i2c-ITE8396:00: error in i2c_hid_init_report > size:19 / ret_size:18 > > which I don't think is relevant, but I might be wrong. > >>> >> 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. >>> >> >> I hope full post of your defconfig will not be needed. However could you >> double check that you have enabled all drivers for accel (check the kbuild >> file in drivers/iio/accel). If they have driver for accel in main kernel (or >> staging) then it will link with existing device tree nicely. > > I'll go back and enable everything just to be safe. Building now, will > report the results once I have them. Using the stock Ubuntu .config as the base, meaning many, many modules (including all possible IIO accelerometers, it seems), I still see no updates to the *raw* file contents. -Nish -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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