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ALSA: seq: ump: Create UMP Endpoint port for broadcast

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Create a sequencer port for broadcasting the all group inputs at the
port number 0.  This corresponds to a UMP Endpoint connection;
application can read all UMP events from this port no matter which
group the UMP packet belongs to.

Unlike seq ports for other UMP groups, a UMP Endpoint port has no
SND_SEQ_PORT_TYPE_MIDI_GENERIC bit, so that it won't be treated as a
normal MIDI 1.0 device from legacy applications.

The port is named as "MIDI 2.0" to align with representations on other
operation systems.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230523075358.9672-34-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2023-05-23 09:53:54 +02:00
parent 81fd444aa3
commit 4025f0e627
1 changed files with 60 additions and 0 deletions
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60
sound/core/seq/seq_ump_client.c
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@ -290,6 +290,62 @@ static void update_group_attrs(struct seq_ump_client *client)
}
}
/* create a UMP Endpoint port */
static int create_ump_endpoint_port(struct seq_ump_client *client)
{
struct snd_seq_port_info *port;
struct snd_seq_port_callback pcallbacks;
unsigned int rawmidi_info = client->ump->core.info_flags;
int err;
port = kzalloc(sizeof(*port), GFP_KERNEL);
if (!port)
return -ENOMEM;
port->addr.client = client->seq_client;
port->addr.port = 0; /* fixed */
port->flags = SNDRV_SEQ_PORT_FLG_GIVEN_PORT;
port->capability = SNDRV_SEQ_PORT_CAP_UMP_ENDPOINT;
if (rawmidi_info & SNDRV_RAWMIDI_INFO_INPUT) {
port->capability |= SNDRV_SEQ_PORT_CAP_READ |
SNDRV_SEQ_PORT_CAP_SYNC_READ |
SNDRV_SEQ_PORT_CAP_SUBS_READ;
port->direction |= SNDRV_SEQ_PORT_DIR_INPUT;
}
if (rawmidi_info & SNDRV_RAWMIDI_INFO_OUTPUT) {
port->capability |= SNDRV_SEQ_PORT_CAP_WRITE |
SNDRV_SEQ_PORT_CAP_SYNC_WRITE |
SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
port->direction |= SNDRV_SEQ_PORT_DIR_OUTPUT;
}
if (rawmidi_info & SNDRV_RAWMIDI_INFO_DUPLEX)
port->capability |= SNDRV_SEQ_PORT_CAP_DUPLEX;
port->ump_group = 0; /* no associated group, no conversion */
port->type = SNDRV_SEQ_PORT_TYPE_MIDI_UMP |
SNDRV_SEQ_PORT_TYPE_HARDWARE |
SNDRV_SEQ_PORT_TYPE_PORT;
port->midi_channels = 16;
strcpy(port->name, "MIDI 2.0");
memset(&pcallbacks, 0, sizeof(pcallbacks));
pcallbacks.owner = THIS_MODULE;
pcallbacks.private_data = client;
if (rawmidi_info & SNDRV_RAWMIDI_INFO_INPUT) {
pcallbacks.subscribe = seq_ump_subscribe;
pcallbacks.unsubscribe = seq_ump_unsubscribe;
}
if (rawmidi_info & SNDRV_RAWMIDI_INFO_OUTPUT) {
pcallbacks.use = seq_ump_use;
pcallbacks.unuse = seq_ump_unuse;
pcallbacks.event_input = seq_ump_process_event;
}
port->kernel = &pcallbacks;
err = snd_seq_kernel_client_ctl(client->seq_client,
SNDRV_SEQ_IOCTL_CREATE_PORT,
port);
kfree(port);
return err;
}
/* release the client resources */
static void seq_ump_client_free(struct seq_ump_client *client)
{
@ -353,6 +409,10 @@ static int snd_seq_ump_probe(struct device *_dev)
goto error;
}
err = create_ump_endpoint_port(client);
if (err < 0)
goto error;
ump->seq_client = client;
ump->seq_ops = &seq_ump_ops;
return 0;