200 lines
6.6 KiB
Groff
200 lines
6.6 KiB
Groff
.\" $NetBSD: ym.4,v 1.13 2002/02/13 08:17:52 ross Exp $
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.\"
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.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Lennart Augustsson.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 20, 1998
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.Dt YM 4
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.Os
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.Sh NAME
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.Nm ym
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.Nd Yamaha OPL3-SA3 audio device driver
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.Sh SYNOPSIS
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.Cd "ym* at isapnp?"
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.Cd "ym* at pnpbios? index ?"
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.Cd "audio* at ym?"
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.Cd "mpu* at ym?"
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.Cd "opl* at ym?"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for Yamaha YMF715x (OPL3-SA3) sound devices.
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.Pp
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The OPL3-SA3 device has
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WSS compatible full-duplex 16bit CODEC,
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OPL3 FM synthesizer,
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MPU401 compatible MIDI I/O port interface,
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and built-in
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.Sq 3D Enhanced
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equalizer.
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.Pp
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The joystick interface is handled by the
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.Xr joy 4
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driver.
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.Sh MIXER DEVICE
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The mixer device of
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.Nm
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driver can be accessed by
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.Xr mixerctl 1
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command.
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The layout is shown below.
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.Bd -literal
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dac ------------------------\*[Lt]----- -----------------
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midi(OPL3/ZV)-\*[Gt]-+----------------------------+-\*[Gt]|inputs.midi |
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cd -\*[Gt]------+-*--------------------------+-\*[Gt]|inputs.cd |
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line -\*[Gt]----*-+-+--------------------------+-\*[Gt]|inputs.line |
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speaker -\*[Gt]----+-+-+--------------------------+-\*[Gt]|inputs.speaker |
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inputs.mic v v v monitor.monitor | | |
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| --------------- ------- | ------- | | |
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mic ---\*[Gt]|record.record|-\*[Gt]| A/D |----\*[Gt]| D/A |-*-\*[Gt]|inputs.dac |analog
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| | |conv.|-- -\*[Gt]|conv.| | |output
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--------------- ------- | | ------- | outputs.master|--\*[Gt]
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wave v | wave | equalization.*|
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recording playback -----------------
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.Ed
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.Pp
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Note that the
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.Sq Dv inputs.dac
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is twice as sensitive as other
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.Sq Dv inputs
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volume variables.
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.Pp
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The hardware volume changes the
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.Sq Dv outputs.master
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value.
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.Pp
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If an external input source is unmuted by setting corresponding
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.Sq Dv inputs.*.mute
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variable to
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.Sq Dv off ,
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the device is never put in global power down or power save mode.
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This is because if the device is in global power down or power save mode,
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the output is automatically muted.
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.Pp
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All the external input sources (CD playback, line input, and speaker)
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are muted by default.
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.Sh POWER MANAGEMENT
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The
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.Nm
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driver is capable of power management on the OPL3-SA3 devices.
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The following modes can be selected by setting
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.Sq Dv power.save
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variable of
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.Xr mixerctl 1
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to
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.Sq Dv powerdown ,
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.Sq Dv powersave ,
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and
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.Sq Dv nosave
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respectively.
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.Pp
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.Bl -tag -width indent -compact
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.It Global power-down mode
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When a subpart of the device is unused, the part is power-down after
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a timeout period (specified by
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.Sq Dv power.save.timeout
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variable of
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.Xr mixerctl 1
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in seconds).
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When all the subparts of the device are unused,
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and all the external input sources are muted,
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the driver puts the device in
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.Sq Global Power Down
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mode.
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.Pp
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On the global power down mode, the power consumption is minimized
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(10\(*mA typ.),
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.\" Note: \(*m is Greek mu
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but the click noise on power up/down the device is rather loud.
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.Bf Em
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This mode should not be used with headphones or hi\-fi audio systems,
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or your ears or the systems may be damaged.
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.Ef
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.It Power save mode
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When a subpart of the device is unused, the part is powered-down after
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a timeout period (specified by
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.Sq Dv power.save.timeout
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variable of
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.Xr mixerctl 1
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in seconds).
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When all the subparts of the device are unused,
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and all the external input sources are muted,
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the driver put the device in
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.Sq Power Save
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mode.
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.Pp
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In power save mode, the power consumption is reduced (5mA typ.).
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The click noise on power up/down of the device is very small,
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but this operation requires muting/unmuting the device, which make some noise.
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In order to reduce the noise, setting the master volume at the small value
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is effective.
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.It "No power-save mode"
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Once the device is powered-up, it remains on after the use of the device.
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Once a subpart of the device is powered-up, it shall not be power-down.
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This mode minimizes click noises on power switching,
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but maximizes power consumption (30-100mA).
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.Pp
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On suspending, the device is put into power-save state.
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.El
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.Sh SEE ALSO
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.Xr mixerctl 1 ,
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.Xr apm 4 ,
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.Xr audio 4 ,
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.Xr isapnp 4 ,
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.Xr joy 4 ,
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.Xr midi 4 ,
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.Xr mpu 4 ,
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.Xr opl 4 ,
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.Xr pnpbios 4
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.Sh HISTORY
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The
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.Nm
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device driver appeared in
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.Nx 1.4 .
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.Sh BUGS
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Although the parameters of the device are saved and restored on
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.Xr apm 4
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suspend/resume, the DMA state is not restored.
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That is, if the system suspends during playback,
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this is not continued after suspend/resume cycle.
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.Pp
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The joystick port is not under power management.
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If a
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.Xr joy 4
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device is configured,
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the device will never be put in global power down or power save mode.
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.Pp
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The external devices, such as Zoomed Video port, OPL4-ML/2, modem, and CD-ROM
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are not supported.
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