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ALSA: aloop: Add control element for getting the access mode

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Add new control element 'PCM Slave Access Mode' which shows the access
mode (interleaved/non-interleaved) for the PCM playing device. Add
corresponding control change notification calls.

Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230927113555.14877-2-ivan.orlov0322@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Ivan Orlov 2023-09-27 12:35:55 +01:00 committed by Takashi Iwai
parent 462494565c
commit e299a9fd43
1 changed files with 44 additions and 1 deletions
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45
sound/drivers/aloop.c
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@ -119,11 +119,13 @@ struct loopback_setup {
unsigned int rate_shift;
snd_pcm_format_t format;
unsigned int rate;
snd_pcm_access_t access;
unsigned int channels;
struct snd_ctl_elem_id active_id;
struct snd_ctl_elem_id format_id;
struct snd_ctl_elem_id rate_id;
struct snd_ctl_elem_id channels_id;
struct snd_ctl_elem_id access_id;
};
struct loopback {
@ -367,6 +369,11 @@ static int loopback_check_format(struct loopback_cable *cable, int stream)
&setup->channels_id);
setup->channels = runtime->channels;
}
if (setup->access != runtime->access) {
snd_ctl_notify(card, SNDRV_CTL_EVENT_MASK_VALUE,
&setup->access_id);
setup->access = runtime->access;
}
}
return 0;
}
@ -1520,6 +1527,30 @@ static int loopback_channels_get(struct snd_kcontrol *kcontrol,
return 0;
}
static int loopback_access_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
const char * const texts[] = {"Interleaved", "Non-interleaved"};
return snd_ctl_enum_info(uinfo, 1, ARRAY_SIZE(texts), texts);
}
static int loopback_access_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct loopback *loopback = snd_kcontrol_chip(kcontrol);
snd_pcm_access_t access;
mutex_lock(&loopback->cable_lock);
access = loopback->setup[kcontrol->id.subdevice][kcontrol->id.device].access;
ucontrol->value.enumerated.item[0] = access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED ||
access == SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
mutex_unlock(&loopback->cable_lock);
return 0;
}
static const struct snd_kcontrol_new loopback_controls[] = {
{
.iface = SNDRV_CTL_ELEM_IFACE_PCM,
@ -1566,7 +1597,15 @@ static const struct snd_kcontrol_new loopback_controls[] = {
.name = "PCM Slave Channels",
.info = loopback_channels_info,
.get = loopback_channels_get
}
},
#define ACCESS_IDX 6
{
.access = SNDRV_CTL_ELEM_ACCESS_READ,
.iface = SNDRV_CTL_ELEM_IFACE_PCM,
.name = "PCM Slave Access Mode",
.info = loopback_access_info,
.get = loopback_access_get,
},
};
static int loopback_mixer_new(struct loopback *loopback, int notify)
@ -1587,6 +1626,7 @@ static int loopback_mixer_new(struct loopback *loopback, int notify)
setup->notify = notify;
setup->rate_shift = NO_PITCH;
setup->format = SNDRV_PCM_FORMAT_S16_LE;
setup->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
setup->rate = 48000;
setup->channels = 2;
for (idx = 0; idx < ARRAY_SIZE(loopback_controls);
@ -1618,6 +1658,9 @@ static int loopback_mixer_new(struct loopback *loopback, int notify)
case CHANNELS_IDX:
setup->channels_id = kctl->id;
break;
case ACCESS_IDX:
setup->access_id = kctl->id;
break;
default:
break;
}