Date: Sat, 6 Aug 2005 09:50:29 +0000 (GMT) From: "A. Wik" <aw@aw.gs> To: freebsd-hackers@freebsd.org Subject: SB 3DSE ioctl() patch Message-ID: <20050806084910.N13128@dynamite.narpes.com>
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(This was originally addressed to Cameron Grant, the author of the files I modified. Unfortunately, my message bounced, and shortly thereafter, I learned that he passed away earlier this year [1]. I hope this forum is an appropriate alternative.) [1] http://lists.nycbug.org/pipermail/talk/2005-March/005014.html **** Hello, I just installed a Soundblaster 16 (DSP v4.16) in my FreeBSD machine, and found no way to enable the 3D stereo enhancement feature that the Linux, DOS and Win9x drivers support. So I looked at the Linux driver sources and decided to add a compatible mixer ioctl() to the FreeBSD driver. That turned out to be a lot more complicated than expected, because there was no existing interface for this kind of hardware-specific ioctls. After extensive reverse-engineering of the FreeBSD driver model (studying the UART and TTY drivers was particularly helpful), and adding a method to the mixer interface, I managed to implement the feature, at least to the extent that it works for me. Perhaps you could take a look at the patch to verify that it doesn't break anything, and consider adding it to the mainstream kernel? The patch and a utility for testing it is available from my FTP site: ftp://vax.narpes.com/users/aw/freebsd-5.3-aw-3dse.diff ftp://vax.narpes.com/users/aw/s3dioctl.c Regards, A. Wik
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