by Tim » Sun, 26 Oct 1997 04:00:00
Can someone recommend a good reference on writing device drivers for the
Sun Sparc platform. In particular the serial port. I am attempting to
write a driver for a touch screen display that interfaces via the serial
port. Is there any source code available related to this project that I
might learn and build from?
1. Device driver calling another device driver.
Hi.
I am having a problem writing a "meta-driver", ie one that is sandwiched
between the kernel and a real device driver. The platform I am using
consists of a Sun IPC, running SunOS 4.1.1.
My problem is that in attempting to use the OPEN(2V) system call from within
the "xxopen" routine of my metadriver (to open another device-driver (which
then opens the device)); OPEN(2V) "fails".
It appears that calling OPEN(2V) from within the kernel requires a different
calling sequence and argument list. Viz-a-viz: instead of a file descriptor
being returned by OPEN(2V), it seems a pointer is returned (which itself is
a pointer to something else).
Is this true? Is the OPEN(2V) syscall different for a process executing in
user address space, compared to the OPEN call executed by a process running
in kernel mode/address space?
If this is true for OPEN, what about CLOSE, READ, WRITE, etc? Unfortunately,
I don't have (easy) access to any Unix (source) code, to verify this.
Thanks in advance for help/advice.
2. connecting serial ports of two Linux pc's
3. Device driver question (generic device driver)
4. xntpd - stopping it reporting to the console?
5. PCI device vs SCSI device driver
8. Different log files for virtual hosts
9. Device driver devices.pci.scsi missing
10. New device device driver development tool for Solaris.
11. one device driver and 2 devices for it, impossible with linux ?
12. My first device driver => "No such device" :(
13. New device device driver development tool for Solaris.