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ALSA: seq: dummy: Allow UMP conversion

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Although the purpose of dummy seq client is a direct pass-through,
it's sometimes helpful for debugging if it can convert to a certain
UMP MIDI version.  This patch adds an option to specify the UMP event
conversion.  As default, it skips the conversion and does
passthrough, while user can pass ump=1 or ump=2 to enforce the
conversion to UMP MIDI1 or MIDI2 format.

Message-ID: <20240419101105.15571-1-tiwai@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2024-04-19 12:11:02 +02:00
parent 3e2f2235b5
commit 32cb23a0f9
1 changed files with 22 additions and 2 deletions
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24
sound/core/seq/seq_dummy.c
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@ -58,6 +58,12 @@ MODULE_PARM_DESC(ports, "number of ports to be created");
module_param(duplex, bool, 0444);
MODULE_PARM_DESC(duplex, "create DUPLEX ports");
#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
static int ump;
module_param(ump, int, 0444);
MODULE_PARM_DESC(ump, "UMP conversion (0: no convert, 1: MIDI 1.0, 2: MIDI 2.0)");
#endif
struct snd_seq_dummy_port {
int client;
int port;
@ -152,7 +158,9 @@ static int __init
register_client(void)
{
struct snd_seq_dummy_port *rec1, *rec2;
#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
struct snd_seq_client *client;
#endif
int i;
if (ports < 1) {
@ -166,12 +174,24 @@ register_client(void)
if (my_client < 0)
return my_client;
/* don't convert events but just pass-through */
#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
client = snd_seq_kernel_client_get(my_client);
if (!client)
return -EINVAL;
client->filter = SNDRV_SEQ_FILTER_NO_CONVERT;
switch (ump) {
case 1:
client->midi_version = SNDRV_SEQ_CLIENT_UMP_MIDI_1_0;
break;
case 2:
client->midi_version = SNDRV_SEQ_CLIENT_UMP_MIDI_2_0;
break;
default:
/* don't convert events but just pass-through */
client->filter = SNDRV_SEQ_FILTER_NO_CONVERT;
break;
}
snd_seq_kernel_client_put(client);
#endif
/* create ports */
for (i = 0; i < ports; i++) {