devctl confusion

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Mike Kadour

devctl confusion

Post by Mike Kadour » Mon Sep 23, 2002 3:44 am

I'm modifying the UCB1300 touch driver (or any devi device/protocol combo
driver) to utilise the four extra a/d's on the chip. To achieve this, I am
going to use devctl commands to return the current a/d value (and possibly
more exotic actions). So here's my question:

The driver sets-up /dev/devi/touch0 and has DEVCTL_SPECIFIC_DCMD defined;

I execute:

fd = open ( /dev/devi/touch0 )
ret = devctl(fd, DEVCTL_SPECIFIC_DCMD, etc...)

but ret = ENOTTY - Inappropriate I/O control operation... what's up?

Thanks in advance,
Mike Kadour

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