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Add power control hooks. 

Make the wave output mute while playback is inactive.  This significantly
reduces noises while preparing playback, especially by mpg123.
This commit is contained in:
itohy 1999-10-05 03:44:31 +00:00
parent 3b2be55d69
commit d82343a7ec
1 changed files with 28 additions and 2 deletions
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30
sys/dev/isa/ad1848_isa.c
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@ -1,4 +1,4 @@
/* $NetBSD: ad1848_isa.c,v 1.12 1999/09/06 17:07:05 rh Exp $ */
/* $NetBSD: ad1848_isa.c,v 1.13 1999/10/05 03:44:31 itohy Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
@ -472,9 +472,23 @@ ad1848_isa_open(addr, flags)
state |= 2;
}
#ifndef AUDIO_NO_POWER_CTL
/* Power-up chip */
if (isc->powerctl)
isc->powerctl(isc->powerarg, flags);
#endif
/* Init and mute wave output */
ad1848_mute_wave_output(sc, WAVE_MUTE2_INIT, 1);
error = ad1848_open(sc, flags);
if (error)
if (error) {
#ifndef AUDIO_NO_POWER_CTL
if (isc->powerctl)
isc->powerctl(isc->powerarg, 0);
#endif
goto bad;
}
DPRINTF(("ad1848_isa_open: opened\n"));
return (0);
@ -510,6 +524,12 @@ ad1848_isa_close(addr)
DPRINTF(("ad1848_isa_close: stop DMA\n"));
ad1848_close(sc);
#ifndef AUDIO_NO_POWER_CTL
/* Power-down chip */
if (isc->powerctl)
isc->powerctl(isc->powerarg, 0);
#endif
}
int
@ -575,6 +595,9 @@ ad1848_isa_trigger_output(addr, start, end, blksize, intr, arg, param)
ad_write(sc, SP_LOWER_BASE_COUNT, blksize & 0xff);
ad_write(sc, SP_UPPER_BASE_COUNT, blksize >> 8);
/* Unmute wave output */
ad1848_mute_wave_output(sc, WAVE_MUTE2, 0);
reg = ad_read(sc, SP_INTERFACE_CONFIG);
ad_write(sc, SP_INTERFACE_CONFIG, PLAYBACK_ENABLE|reg);
@ -605,6 +628,9 @@ ad1848_isa_halt_output(addr)
struct ad1848_softc *sc = &isc->sc_ad1848;
if (isc->sc_playrun) {
/* Mute wave output */
ad1848_mute_wave_output(sc, WAVE_MUTE2, 1);
ad1848_halt_output(sc);
isa_dmaabort(isc->sc_ic, isc->sc_playdrq);
isc->sc_playrun = 0;