Add a new API for soundcards that have hardware volume control:

- The mixer_hwmute() function can be called when a soundcard receives a
  mute request.
- The mixer_hwstep() function can be used to adjust the volume of one or
  both channels.
- The 'hw.snd.hwvol_step' sysctl determines the amount that mixer_hwstep()
  adjusts the volume by on each call.
- The 'hw.snd.hwvol_mixer' sysctl specifies the mixer device to adjust the
  volume on for both functions.  The values used correspond to the
  SOUNDCARD_MIXER_* constants.

1 files changed, 3 insertions, 0 deletions

diff --git a/sys/dev/sound/pcm/mixer.h b/sys/dev/sound/pcm/mixer.h
index 08824fc..b29cc14 100644
--- a/sys/dev/sound/pcm/mixer.h
+++ b/sys/dev/sound/pcm/mixer.h
@@ -33,6 +33,9 @@ extern int mixer_ioctl(snddev_info *d, u_long cmd, caddr_t arg);
 extern int mixer_busy(snd_mixer *m, int busy);
 extern int mixer_isbusy(snd_mixer *m);
 
+void mixer_hwmute(device_t dev);
+void mixer_hwstep(device_t dev, int left_step, int right_step);
+
 extern void change_bits(mixer_tab *t, u_char *regval, int dev, int chn, int newval);
 
 void mix_setdevs(snd_mixer *m, u_int32_t v);