On Sat, 24 Mar 2018 03:25:23 +0100, Andrew Chant wrote:
This implements UAC2 jack detection support, presenting jack status as a boolean read-only mono mixer.
The presence of any channel in the UAC2_TE_CONNECTOR control for a terminal will result in the mixer saying the jack is connected.
Mixer naming follows the convention in sound/core/ctljack.c, terminating the mixer with " Jack". For additional clues as to which jack is being presented, the name is prefixed with " - Input Jack" or " - Output Jack" depending on if it's an input or output terminal.
This is required because terminal names are ambiguous between inputs and outputs and often duplicated - Bidirectional terminal types (0x400 -> 0x4FF) "... may be used separately for input only or output only. These types require two Terminal descriptors. Both have the same type." (quote from "USB Device Class Definition for Terminal Types")
Since bidirectional terminal types are common for headphone adapters, this distinguishes between two otherwise identically-named jack controls.
Tested with a UAC2 audio device with connector control capability.
Signed-off-by: Andrew Chant achant@google.com
Applied now, thanks.
Takashi