Commit eacd9c7f authored by Takashi Iwai's avatar Takashi Iwai
Browse files

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: default avatarTakashi Iwai <tiwai@suse.de>
parent a7980768

include/sound/ump.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

sound/core/ump.c

+4 −0
Original line number Diff line number Diff line
@@ -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]);