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sound(4): Implement playback and recording mode sysctl(8).

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The dev.pcm.<N>.mode sysctl(8) gives information if a sound device
supports hardware mixing, playback or recording.

Submitted by:	Christos Margiolis <christos@freebsd.org>
Differential Revision:	https://reviews.freebsd.org/D31320
MFC after:	1 week
Sponsored by:	NVIDIA Networking
This commit is contained in:
Hans Petter Selasky 2021-07-28 13:22:52 +02:00
parent 132fca6335
commit ed2196e5df
2 changed files with 27 additions and 0 deletions
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23
sys/dev/sound/pcm/sound.c
View File

@ -1015,10 +1015,28 @@ SYSCTL_PROC(_hw_snd, OID_AUTO, clone_gc,
"global clone garbage collector");
#endif
static u_int8_t
pcm_mode_init(struct snddev_info *d)
{
u_int8_t mode = 0;
if (d->playcount > 0)
mode |= PCM_MODE_PLAY;
if (d->reccount > 0)
mode |= PCM_MODE_REC;
if (d->mixer_dev != NULL)
mode |= PCM_MODE_MIXER;
return (mode);
}
static void
pcm_sysinit(device_t dev)
{
struct snddev_info *d = device_get_softc(dev);
u_int8_t mode;
mode = pcm_mode_init(d);
/* XXX: a user should be able to set this with a control tool, the
sysadmin then needs min+max sysctls for this */
@ -1030,6 +1048,11 @@ pcm_sysinit(device_t dev)
"bitperfect", CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NEEDGIANT, d,
sizeof(d), sysctl_dev_pcm_bitperfect, "I",
"bit-perfect playback/recording (0=disable, 1=enable)");
SYSCTL_ADD_UINT(device_get_sysctl_ctx(dev),
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
OID_AUTO, "mode", CTLFLAG_RD, NULL, mode,
"mode (1=mixer, 2=play, 4=rec. The values are OR'ed if more than one"
"mode is supported)");
#ifdef SND_DEBUG
SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,

4
sys/dev/sound/pcm/sound.h
View File

@ -412,6 +412,10 @@ struct snddev_info {
void sound_oss_sysinfo(oss_sysinfo *);
int sound_oss_card_info(oss_card_info *);
#define PCM_MODE_MIXER 0x01
#define PCM_MODE_PLAY 0x02
#define PCM_MODE_REC 0x04
#define PCM_LOCKOWNED(d) mtx_owned((d)->lock)
#define PCM_LOCK(d) mtx_lock((d)->lock)
#define PCM_UNLOCK(d) mtx_unlock((d)->lock)