ADC108S022: linux driver

satyajit bhuyan

Prodigy 30 points

Part Number: ADC108S022
Other Parts Discussed in Thread: ADC108S102,

I need a driver for linux kernel 4.9.

over 3 years ago

0 Collin Wells over 3 years ago

TI__Guru 62765 points

Hello,

I'm not sure we're going to have exactly what you're looking for and won't claim to be Linux experts, but we'll provide what we have. You'll find some drivers for our TI ADCs in the IIO/ADC git repository which I've linked below.

We don't have the ADC108S022, but do have the ADC108S102.C file which is a higher speed variant of the ADC108S022 and should work for your project. Specific commands not included in the driver can be accomplished using dedicated SPI transactions.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/iio/adc/

-rw-r--r--	ti-adc081c.c	5676	log stats plain
-rw-r--r--	ti-adc0832.c	8448	log stats plain
-rw-r--r--	ti-adc084s021.c	7320	log stats plain
-rw-r--r--	ti-adc108s102.c	8542	log stats plain
-rw-r--r--	ti-adc12138.c	12855	log stats plain
-rw-r--r--	ti-adc128s052.c	5411	log stats plain
-rw-r--r--	ti-adc161s626.c	5832	log stats plain
-rw-r--r--	ti-ads1015.c	29057	log stats plain
-rw-r--r--	ti-ads124s08.c	9270	log stats plain
-rw-r--r--	ti-ads7950.c	19466	log stats plain
-rw-r--r--	ti-ads8344.c	4889	log stats plain
-rw-r--r--	ti-ads8688.c	12802	log stats plain
-rw-r--r--	ti-tlc4541.c	6716	log stats plain

Occasionally we'll have tool folders on TI.com to promote the drivers, but not always.
https://www.ti.com/tool/ADC128S052SW-LINUX

0 PRAHLAD Supeda over 3 years ago in reply to Collin Wells

TI__Expert 5175 points

Customer have managed to integrate the driver for TI ADC108S102 given in below git repo:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/iio/adc/ti-adc108s102.c

But while trying to set up for trigger buffer it fails:

root@fusion:~# echo 100 > /sys/bus/iio/devices/iio:device0/buffer/length
root@fusion:~# echo 1 > /sys/bus/iio/devices/iio:device0/buffer/enable
sh: write error: Invalid argument
root@fusion:~# echo 0 > /sys/bus/iio/devices/iio:device0/buffer/enable
root@fusion:~#

The linux kernel version : Linux 4.9.88-ga-fusion+g6507266728a7 armv7l

Which linux version this driver was tested? Also, customer need the start/stop capture functionality of ADC driver. How to add trigger functionality in the driver?

0 Collin Wells over 3 years ago in reply to PRAHLAD Supeda

TI__Guru 62765 points

Hi Prahlad,

Our primary expertise in the team is on precision ADCs and we won't claim to be Linux experts. So, while we know where to find available drivers and can answer basic questions, I am not sure what's causing the results of the driver integration the customer is sharing. Is it possible to take a screen grab of the resulting SPI communications to see if we can determine what's going on with the communication at the hardware level?

Regarding testing and development, you'll notice that this driver was not created by TI so it's not possible to determine when or exactly how it was tested.

0 satyajit bhuyan over 3 years ago in reply to Collin Wells

Prodigy 30 points

the ADC108S102 driver does not deassert the CS after the transaction ends rather the CS line remains low.

this is another issue

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ADC108S022: linux driver