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ALSA: seq: Introduce SNDRV_SEQ_IOCTL_USER_PVERSION ioctl

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For the future extension of ALSA sequencer ABI, introduce a new ioctl
SNDRV_SEQ_IOCTL_USER_PVERSION.  This is similar like the ioctls used
in PCM and other interfaces, for an application to specify its
supporting ABI version.

The use of this ioctl will be mandatory for the upcoming UMP support.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230523075358.9672-25-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2023-05-23 09:53:45 +02:00
parent 1359905383
commit afb72505e4
4 changed files with 11 additions and 0 deletions
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1
include/uapi/sound/asequencer.h
View file

@ -561,6 +561,7 @@ struct snd_seq_query_subs {
#define SNDRV_SEQ_IOCTL_CLIENT_ID _IOR ('S', 0x01, int)
#define SNDRV_SEQ_IOCTL_SYSTEM_INFO _IOWR('S', 0x02, struct snd_seq_system_info)
#define SNDRV_SEQ_IOCTL_RUNNING_MODE _IOWR('S', 0x03, struct snd_seq_running_info)
#define SNDRV_SEQ_IOCTL_USER_PVERSION _IOW('S', 0x04, int)
#define SNDRV_SEQ_IOCTL_GET_CLIENT_INFO _IOWR('S', 0x10, struct snd_seq_client_info)
#define SNDRV_SEQ_IOCTL_SET_CLIENT_INFO _IOW ('S', 0x11, struct snd_seq_client_info)

8
sound/core/seq/seq_clientmgr.c
View file

@ -1056,6 +1056,12 @@ static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
return 0;
}
static int snd_seq_ioctl_user_pversion(struct snd_seq_client *client, void *arg)
{
client->user_pversion = *(unsigned int *)arg;
return 0;
}
static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
{
int *client_id = arg;
@ -1985,6 +1991,7 @@ static const struct ioctl_handler {
int (*func)(struct snd_seq_client *client, void *arg);
} ioctl_handlers[] = {
{ SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
{ SNDRV_SEQ_IOCTL_USER_PVERSION, snd_seq_ioctl_user_pversion },
{ SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
{ SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
{ SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
@ -2125,6 +2132,7 @@ int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
client->accept_input = 1;
client->accept_output = 1;
client->data.kernel.card = card;
client->user_pversion = SNDRV_SEQ_VERSION;
va_start(args, name_fmt);
vsnprintf(client->name, sizeof(client->name), name_fmt, args);

1
sound/core/seq/seq_clientmgr.h
View file

@ -35,6 +35,7 @@ struct snd_seq_client {
snd_seq_client_type_t type;
unsigned int accept_input: 1,
accept_output: 1;
unsigned int user_pversion;
char name[64]; /* client name */
int number; /* client number */
unsigned int filter; /* filter flags */

1
sound/core/seq/seq_compat.c
View file

@ -81,6 +81,7 @@ static long snd_seq_ioctl_compat(struct file *file, unsigned int cmd, unsigned l
switch (cmd) {
case SNDRV_SEQ_IOCTL_PVERSION:
case SNDRV_SEQ_IOCTL_USER_PVERSION:
case SNDRV_SEQ_IOCTL_CLIENT_ID:
case SNDRV_SEQ_IOCTL_SYSTEM_INFO:
case SNDRV_SEQ_IOCTL_GET_CLIENT_INFO: