ALSA: usb-audio: UAC3 Add support for connector insertion.

This adds support for the UAC3 insertion controls. The status
is reported as a boolean value in the same way it used to do
for UAC2. Hence, the presence of any connector in the response
will make the control saying the jack is connected.

The UAC2 support for this control has been moved to a dedicated
control for connectors as both UAC2 and UAC3 follow a specific
Control Request Parameter Block for this control. This parameter
block for UAC3 could not be read in the same simplistic
manner as in UAC2.

This implementation is not requesting additional information
from the HIGH CAPABILITY Connectors descriptor.

Tested with an UAC3 device with UAC2 as legacy configuration.
The connector status can be read with `amixer` and the interrupt
is also caught with `alsactl monitor`.

Signed-off-by: Jorge Sanjuan <jorge.sanjuan@codethink.co.uk>
Reviewed-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Tested-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/usb/audio-v2.h b/include/linux/usb/audio-v2.h
index aaafecf073ff..a96ed2ce3254 100644
--- a/include/linux/usb/audio-v2.h
+++ b/include/linux/usb/audio-v2.h
@@ -189,6 +189,13 @@ struct uac2_iso_endpoint_descriptor {
 #define UAC2_CONTROL_DATA_OVERRUN	(3 << 2)
 #define UAC2_CONTROL_DATA_UNDERRUN	(3 << 4)
 
+/* 5.2.5.4.2 Connector Control Parameter Block */
+struct uac2_connectors_ctl_blk {
+	__u8 bNrChannels;
+	__le32 bmChannelConfig;
+	__u8 iChannelNames;
+} __attribute__((packed));
+
 /* 6.1 Interrupt Data Message */
 
 #define UAC2_INTERRUPT_DATA_MSG_VENDOR	(1 << 0)