cdrom speed adjustment ioctl

[Egervary Gergely]

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
[EMAIL PROTECTED]



To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-hackers" in the body of the message