| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <CAOhV88P3wbf6Jhx+yyhbiWLKWYek8AzKuki-Smy9TX_XTfQYwQ@mail.gmail.com> Date: Thu, 17 Dec 2015 10:10:44 -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 Thu, Dec 17, 2015 at 9:32 AM, Nish Aravamudan <nish.aravamudan@...il.com> wrote: > On Thu, Dec 17, 2015 at 12:41 AM, Crt Mori <cmo@...exis.com> wrote: >> On 17 December 2015 at 06:27, Nish Aravamudan <nish.aravamudan@...il.com> wrote: >>> 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: >>>> >> >> This is correct/intended. You need to confirm "deviceX/name" each time. > > Got it! > >>>> /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 >> >> This seems like a valid number 1023 * 0.009806 = 10,031 m/s2 but X does not. > > Ok... > >>>> /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 >> >> This is buffer enable not chip enable. You can write 1 to that so it >> will be enables >> (echo "1" > /sys/bus/iio/devices/.../buffer/enable) and see what >> happens. It might be >> that it needs buffer to update properly (I haven't checked the code). > > Doesn't immediately seem to make a difference. > >>>> >>>> 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. >> >> If accel is i2c this might be a relevant error - and probe would also >> not fail, but error would >> repeat itself each time probably Maybe track where that line is in >> i2c_hid and see what it >> could mean. > > i2c_hid i2c-ITE8396:00: report (len=19): 12 00 5a ff ff ff ff ff ff ff > ff ff ff ff ff ff ff ff 06 > i2c_hid i2c-ITE8396:00: error in i2c_hid_init_report size:19 / ret_size:18 > > So it seems like the device indicates an expected return size of 18, > but actually gives 19 bytes. > > I don't know anything about i2c, but i'll dig around. Another thought I had, reading through Google results for other Yoga laptops, the sensor device showed up in lsusb. Would I expect to see any such device in lsusb for the Yoga 900? I only get: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 003: ID 8087:0a2b Intel Corp. Bus 001 Device 002: ID 13d3:5664 IMC Networks Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub -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/
Powered by blists - more mailing lists