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ALSA: ump: Add no_process_stream flag

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This is another preliminary patch for USB MIDI 2.0 gadget driver.
Add a new flag, no_process_stream, to snd_ump for suppressing the UMP
Stream message handling in UMP core.

Link: https://lore.kernel.org/r/20230621110241.4751-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2023-06-21 13:02:40 +02:00
parent a798076837
commit eacd9c7f1d
2 changed files with 5 additions and 0 deletions
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1
include/sound/ump.h
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@ -28,6 +28,7 @@ struct snd_ump_endpoint {
u32 stream_wait_for; /* expected stream message status */
bool stream_finished; /* set when message has been processed */
bool parsed; /* UMP / FB parse finished? */
bool no_process_stream; /* suppress UMP stream messages handling */
wait_queue_head_t stream_wait;
struct snd_rawmidi_file stream_rfile;

4
sound/core/ump.c
View File

@ -854,6 +854,10 @@ static void ump_handle_stream_msg(struct snd_ump_endpoint *ump,
unsigned int status;
int ret;
/* UMP stream message suppressed (for gadget UMP)? */
if (ump->no_process_stream)
return;
BUILD_BUG_ON(sizeof(*msg) != 16);
ump_dbg(ump, "Stream msg: %08x %08x %08x %08x\n",
buf[0], buf[1], buf[2], buf[3]);