topic Fxos8700 accelerometer not shown in input device event list in i.MX Processors

Fxos8700 accelerometer not shown in input device event list

prathamrahate — Tue, 11 Apr 2017 18:32:29 GMT

Hi,

I am having custom board with fxos8700 sensor. Sensor is getting probed successfully. Also using i2c-tools i am getting data from sensor. But i could not find sensor entry under /dev/input/eventX of linux. I can see /dev/FreescaleAccelerometer entry.

What could be reason for this?? Also are there any applications (games) through which i can verify accelerometer data??

Thanks,

Prathamesh

Re: Fxos8700 accelerometer not shown in input device event list

brenolima — Thu, 13 Apr 2017 12:18:44 GMT

Hi,

You can use the evtest application for testing the senor.

Maybe it's necessary to enable the sensor, for example enabling FXOS8700 on the i.MX7D SabreSD board:

$ echo 1 > /sys/devices/virtual/misc/FreescaleAccelerometer/enable

$ echo 1 > /sys/devices/virtual/misc/FreescaleMagnetometer/enable

Best regards,

Breno Lima

Re: Fxos8700 accelerometer not shown in input device event list

david_diaz — Thu, 13 Apr 2017 15:13:44 GMT

Hello,

I have attached a FXOS8700CQ Sensor driver compatible with Linux in case it is useful for you.

Using the file mentioned, you can read the sensor 6-axis raw data.

I hope it helps as a reference for your application.

Regards,

David

Re: Fxos8700 accelerometer not shown in input device event list

prathamrahate — Thu, 13 Apr 2017 19:50:40 GMT

Hi Breno,

Thanks for your reply. But i do not have FreescaleAccelerometer under /sys/devices/virtual/misc/ path.

Do you know wt could be the reason?

Thanks,

Prathamesh

Re: Fxos8700 accelerometer not shown in input device event list

prathamrahate — Thu, 13 Apr 2017 19:52:49 GMT

Hi David,

Thanks for the reply. I am not using android platform. I am working on ubuntu core system.

I have gone through the driver you have shared, it looks different than the one which i have in my linux kernel.

I am using 3.14.52 kernel.

Thanks,

Prathamesh

Re: Fxos8700 accelerometer not shown in input device event list

brenolima — Fri, 14 Apr 2017 00:15:38 GMT

Hi,

Are you using the driver located at drivers/misc/fxos8700.c? Check if it's enabled in kernel menuconfig and also your dts file.

Maybe the following commits can help:

linux-imx.git - i.MX Linux Kernel

Regards,

Breno Lima