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ALSA: usb-audio: us144mkii: Implement audio playback and feedback

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This patch implements the full audio playback data path. It introduces
the allocation, submission, and completion handling for isochronous
playback and feedback URBs.

The feedback URB completion handler is the core of the driver's clocking
mechanism. It reads the number of samples consumed by the device and
uses a pattern-based algorithm to adjust the size of outgoing playback
packets. This keeps the host and device synchronized and prevents xruns.

The patch also adds the necessary vendor and UAC control messages to
configure the device's sample rate. The PCM trigger is updated to
start and stop the playback and feedback URBs. Basic suspend and resume
handlers are included to manage stream state across power cycles.

Signed-off-by: Šerif Rami <ramiserifpersia@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20250814172222.9448-4-ramiserifpersia@gmail.com
This commit is contained in:
Šerif Rami 2025-08-14 19:22:18 +02:00 • committed by Takashi Iwai
commit a2a2210f2c
6 changed files with 963 additions and 27 deletions
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