SND_AC97_UPDATE_POWE(9) Control/Mixer API SND_AC97_UPDATE_POWE(9)NAME
snd_ac97_update_power - update the powerdown register
SYNOPSIS
int snd_ac97_update_power(struct snd_ac97 * ac97, int reg, int powerup);
ARGUMENTS
ac97
the codec instance
reg
the rate register, e.g. AC97_PCM_FRONT_DAC_RATE
powerup
non-zero when power up the part
DESCRIPTION
Update the AC97 powerdown register bits of the given part.
RETURN
Zero.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SND_AC97_UPDATE_POWE(9)
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oss_cmi878x(7) OSS Devices oss_cmi878x(7)NAME
oss_cmi878x - CMedia CMI8788 audio driver.
DESCRIPTION
Open Sound System driver for CMedia Electronics CMI8788 audio
CMI87xx device characteristics:
o 8/16/24/32 bit playback/record
o mono/stereo/4ch/5.1/7.1 playback
o 8KHz to 192Khz sample rate.
The CMedia 8788 device provides 3 types of devices. The first devices is a Multichannel full duplex device. The second device provides
Front Panel audio access and the SPDIF device provide SPDIF (Digital) audio I/O.
MIXER PANEL
The CMedia chip provides some unique features that are set up by the Mixer chip. There are 3 mixer devices presented to the user.
Main Mixer Panel (/dev/mixer0)
o Master Mixer panel is for controlling output volumes for each of the 8 channels.
o Monitor buttons will allow you to monitor the input from the Rear Panel inputs, Front Panel Inputs and SPDIF IN.
o Speaker-Spread function duplicates the front channel output on all 8 speakers.
o SPDIF Loopback simply takes SPDIF Input and Plays it out the SPDIF Output. panel.
AC97 Input Mixer Panel (/dev/mixer1) This mixer panel is used to switch between the various inputs like line-in, mic, cd. When the
Rear Panel Monitor button is check marked in the Main mixer panel, the IGAIN slider in this panel controls the level of the input
that can be hear on the speakers.
AC97 Front Panel Mixer (/dev/mixer2) This mixer controls the front panel ac97 device. It can be used to control all the volumes and
inputs as well as SPDIF output on the front panel device.
OPTIONS
None
FILES
/etc/oss4/conf/oss_cmi878x.conf Device configuration file
AUTHOR
4Front Technologies
16 December 2012 oss_cmi878x(7)
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