eap(4) - NetBSD Manual Pages

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EAP(4)                  NetBSD Kernel Interfaces Manual                 EAP(4)

eap -- AudioPCI audio device driver
eap* at pci? dev ? function ? options EAP_USE_BOTH_DACS audio* at audiobus? joy* at eap? midi* at eap?
The eap driver provides support for the Ensoniq AudioPCI and Creative Labs SoundBlaster PCI series of audio cards. All models based on the ES1370, ES1371, and ES1373 chips are supported. By specifying: options EAP_USE_BOTH_DACS a second audio device is attached. This can be used for audio output simultaneously with the primary DAC. You can use it simply by directing audio output to the additional /dev/audioX device associated with it.
ac97(4), audio(4), joy(4), midi(4), pci(4)
The eap device driver appeared in NetBSD 1.4.
The joystick port hardware works by emulating a legacy isa(4) joystick port, bypassing the pci(4) bus method for address allocation. This is unlikely to work on PCI busses other than the primary one. There is also a possibility for conflicts with real ISA devices because the PCI bus is probed before ISA. Use with caution. The EAP_USE_BOTH_DACS option is rather redundant after the introduction of the in-kernel audio mixer, and may be removed in a future release. It is possible that it could be used to accelerate mixing streams by taking advantage of the hardware's features, but currently the additional (small) overhead of the kernel mixer is impossible to bypass, since NetBSD no longer allows userspace software to write directly to audio hardware. The eap hardware only features one clock, so generally the second audio device must be configured in the same way as the first. NetBSD 10.99 May 16, 2024 NetBSD 10.99
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