incorrect channel type (in, out, in_out?)

[rgetz]

I'm not sure if this is kernel issue or a libiio one.

iio_attr -a -c ad9361-phy out
Using auto-detected IIO context at URI "usb:3.20.5"
dev 'ad9361-phy', channel 'out' (input), attr 'voltage_filter_fir_en', value '0'

an input channel called out?

we have:

in_voltage_filter_fir_en
out_voltage_filter_fir_en

which follow the normal constructs for global voltage[n] attributes, but then we also have:

in_out_voltage_filter_fir_en

which I think effects both inputs and output channels, but might break the kernel ABI? or is libiio just not handling in_out channels?

?

[mhennerich]

This convention is used for things that are both directions. It's only used once. It's not mainline and thus libiio doesn't handle it. I would have reverted it but I didn't want to break the API.
We have some workaround here:
https://github.com/analogdevicesinc/libad9361-iio/blob/master/ad9361_baseband_auto_rate.c#L64

[rgetz]

OK - I will keep this open until we decide that the "in_out" (bidirectional attributes) are going upstream (and we should extend libiio) or if they aren't (and we should just leave it alone).

-Robin

[rgetz]

Ok - now iio_info gives:

                        out:  (input, WARN:iio_channel_get_type()=UNKNOWN)
                        1 channel-specific attributes found:
                                attr  0: voltage_filter_fir_en value: 0

as a polite reminder...

[rgetz]

closing - since this is a kernel driver issue.