When I connect WH-701 to device sometimes it works and then I see following in dmesg:

[124036.370391] twl5031_aci twl5031_aci: ECI as SND_JACK_HEADSET

But more frequent result is negative and in this case it says

[147594.968536] twl5031_aci twl5031_aci: AV jack open cable as SND_JACK_LINEOUT

Do somebody know how to hack twl5031_aci and force it always recognize WH-701 as SND_JACK_HEADSET, not SND_JACK_LINEOUT? This particular headset always work properly with E7.