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NetBSD 6.1.5 - man page for ym (netbsd section 4)

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YM(4)				   BSD Kernel Interfaces Manual 			    YM(4)

NAME
     ym -- Yamaha OPL3-SA2 and OPL3-SA3 audio device driver

SYNOPSIS
     ym*    at acpi?
     ym*    at isapnp?
     ym*    at pnpbios? index ?
     audio* at audiobus?
     mpu*   at ym?
     opl*   at ym?

DESCRIPTION
     The ym driver provides support for Yamaha YMF711 (OPL3-SA2) and YMF715x (OPL3-SA3) sound
     devices.

     The OPL3-SAx device has WSS compatible full-duplex 16bit CODEC, OPL3 FM synthesizer, and
     MPU401 compatible MIDI I/O port interface.  Additionally, OPL3-SA3 has built-in '3D
     Enhanced' equalizer.

     The joystick interface is handled by the joy(4) driver.

MIXER DEVICE
     The mixer device of ym driver can be accessed by mixerctl(1) command.  The layout is shown
     below.

		 dac ------------------------<-----  -----------------
     midi(OPL3/ZV)->-+----------------------------+->|inputs.midi    |
     cd      ->------+-*--------------------------+->|inputs.cd      |
     line    ->----*-+-+--------------------------+->|inputs.line    |
     speaker ->----+-+-+--------------------------+->|inputs.speaker |
     mic     ->--*-+-+-+--------------------------+->|inputs.mic     |
		 v v v v      monitor.monitor	  |  |		     |
	     ---------------  -------  |  ------- |  |		     |
	     |record.record|->| A/D |---->| D/A |-*->|inputs.dac     |analog
	     |		   |  |conv.|-- ->|conv.|    |		     |output
	     ---------------  ------- | | -------    | outputs.master|-->
				wave  v | wave	     | equalization.*|
			      recording playback     -----------------

     Note that the 'inputs.dac' is twice as sensitive as other 'inputs' volume variables.

     The hardware volume changes the 'outputs.master' value.

     If an external input source is unmuted by setting corresponding 'inputs.*.mute' variable to
     'off', the device is never put in global power down or power save mode.  This is because if
     the device is in global power down or power save mode, the output is automatically muted.

     All the external input sources (CD playback, line input, speaker, and MIC) are muted by
     default.

     The 'equalization.*' variables does not exists on OPL3-SA2.  The 'equalization.treble' and
     'equalization.bass' are enhancement only, and any values below the center position (128)
     don't take any effect.

POWER MANAGEMENT
     The ym driver is capable of power management on the OPL3-SAx devices.  The following modes
     can be selected by setting 'power.save' variable of mixerctl(1) to 'powerdown', 'powersave',
     and 'nosave' respectively.

     Global power-down mode
	     When a subpart of the device is unused, the part is power-down after a timeout
	     period (specified by 'power.save.timeout' variable of mixerctl(1) in seconds).  When
	     all the subparts of the device are unused, and all the external input sources are
	     muted, the driver puts the device in 'Global Power Down' mode.

	     On the global power down mode, the power consumption is minimized (10uA (SA3) or
	     200uA (SA2) typ.), but the click noise on power up/down the device is rather loud.
	     This mode should not be used with headphones or hi-fi audio systems, or your ears or
	     the systems may be damaged.
     Power save mode
	     When a subpart of the device is unused, the part is powered-down after a timeout
	     period (specified by 'power.save.timeout' variable of mixerctl(1) in seconds).  When
	     all the subparts of the device are unused, and all the external input sources are
	     muted, the driver put the device in 'Power Save' mode.

	     In power save mode, the power consumption is reduced (5mA typ.).  The click noise on
	     power up/down of the device is very small, but this operation requires muting/unmut-
	     ing the device, which make some noise.  In order to reduce the noise, setting the
	     master volume at the small value is effective.
     No power-save mode
	     Once the device is powered-up, it remains on after the use of the device.	Once a
	     subpart of the device is powered-up, it shall not be power-down.  This mode mini-
	     mizes click noises on power switching, but maximizes power consumption (30-100mA).

	     On suspending, the device is put into power-save state.

SEE ALSO
     mixerctl(1), apm(4), audio(4), isapnp(4), joy(4), midi(4), mpu(4), opl(4), pnpbios(4)

HISTORY
     The ym device driver appeared in NetBSD 1.4.

BUGS
     Although the parameters of the device are saved and restored on apm(4) suspend/resume, the
     DMA state is not restored.  That is, if the system suspends during playback, this is not
     continued after suspend/resume cycle.

     The joystick port is not under power management.  If a joy(4) device is configured, the
     device will never be put in global power down or power save mode.

     The external devices, such as Zoomed Video port, OPL4-ML/2, modem, and CD-ROM are not sup-
     ported.

BSD					 August 14, 2006				      BSD
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