Date: Sun, 28 Nov 1999 21:08:20 +0100 (CET) From: Egervary Gergely <mauzi@faber.poli.hu> To: freebsd-hackers@freebsd.org Subject: cdrom speed adjustment ioctl Message-ID: <Pine.LNX.4.10.9911282107150.5931-100000@faber.poli.hu>
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hello,
I've just hacked a new ioctl into the ATAPI cdrom driver, which
lets the user to specify (pronounce: ``slow down'' :) the speed
of todays' extremely high speed drives.
It's a documented ATAPI feature, and is very easy to implement,
and I've found it very useful :)
first, you need to add the ioctl into sys/cdio.h:
struct ioc_spdsel
{
int rate;
}
#define CDIOCSPDSEL _IOW('c',32,struct ioc_spdsel)
second, need to add this into i386/isa/atapi.h
#define ATAPI_SPEED_SELECT 0xbb
and finally need to add this case into the function ``acdioctl'' in
i386/isa/atapi-cd.c
case CDIOCSPDSEL:
{
struct ioc_spdsel *arg = (struct ioc_spdsel *)addr;
return acd_request_wait(cdp, ATAPI_SPEED_SELECT, 0,
arg->rate>>8 & 0xff,
arg->rate & 0xff,
0, 0, 0, 0, 0, 0, 0, 0);
}
of course unified diff's are available. i'm not an experienced
kernel hacker, please feel free to correct me and drop me
a mail about this thingy...
thanks in advance
-- mauzi
Gergely EGERVARY
mauzi@lkg.rulez.org
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