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| author | Takashi Iwai <tiwai@suse.de> | 2023-06-21 13:02:40 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2023-06-21 13:06:18 +0200 |
| commit | eacd9c7f1d3ab8381a99b98b36652b5cf6ae8387 (patch) | |
| tree | ac719a99215aaa865a305845de2721731a342fba | |
| parent | ALSA: ump: Add helper to change MIDI protocol (diff) | |
| download | linux-eacd9c7f1d3ab8381a99b98b36652b5cf6ae8387.tar.xz linux-eacd9c7f1d3ab8381a99b98b36652b5cf6ae8387.zip | |
ALSA: ump: Add no_process_stream flag
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>
| -rw-r--r-- | include/sound/ump.h | 1 | ||||
| -rw-r--r-- | sound/core/ump.c | 4 |
2 files changed, 5 insertions, 0 deletions
diff --git a/include/sound/ump.h b/include/sound/ump.h index 3c7e67475676..2f6a9944c6ef 100644 --- a/include/sound/ump.h +++ b/include/sound/ump.h @@ -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; diff --git a/sound/core/ump.c b/sound/core/ump.c index 4150b9c0b35b..5e73c9cf5919 100644 --- a/sound/core/ump.c +++ b/sound/core/ump.c @@ -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]); |