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|
/* --------------------------------------------------
| NAME
| devices
| PURPOSE
| handle exec devices in a standard way.
| NOTES
|
| COPYRIGHT
| Copyright (C) 1993 Christian E. Hopps
|
| This program is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2 of the License, or
| (at your option) any later version.
|
| This program is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with this program; if not, write to the Free Software
| Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
| HISTORY
| chopps - Oct 9, 1993: Created.
+--------------------------------------------------- */
#include "util.h"
#include "devices.h"
/* returns structure with device open. */
struct device_data *
alloc_device (char *name, ulong unit, ulong flags, ulong iosize)
{
struct device_data *dd = zmalloc (sizeof (*dd));
if (NULL == dd) {
return (NULL);
}
dd->port = CreateMsgPort ();
if (NULL == dd->port) {
free_device (dd);
return (NULL);
}
dd->io = CreateIORequest (dd->port, iosize);
if (NULL == dd->io) {
free_device (dd);
return (NULL);
}
dd->name = copy_string (name);
if (NULL == dd->name) {
free_device (dd);
return (NULL);
}
dd->unit = unit;
dd->flags = flags;
if (open_device (dd)) {
free_device (dd);
return (NULL);
}
return (dd);
}
void
free_device (struct device_data *dd)
{
if (dd) {
close_device (dd);
DeleteIORequest (dd->io);
DeleteMsgPort (dd->port);
zfree (dd->name);
}
}
int
open_device (struct device_data *dd)
{
int error = -1;
if (dd && !dd->open) {
error = OpenDevice (dd->name, dd->unit, dd->io, dd->flags);
if (!error) {
dd->open = 1;
} else {
if (-1 != error) {
D(debug_message ("warn: unable to open \"%s\" unit: %ld flags 0x%lx",
dd->name, dd->unit, dd->flags));
D(debug_message (" reason: error %ld", error));
}
dd->open = 0;
}
}
return (error);
}
void
close_device (struct device_data *dd)
{
if (dd) {
if (dd->open) {
if(!CheckIO (dd->io)) {
AbortIO (dd->io);
WaitIO (dd->io);
}
CloseDevice (dd->io);
dd->open = 0;
}
}
}
/* returns actual number of bytes written or -1 for error. */
ulong
device_read (struct device_data *dd, ulong offset, ulong bytes, void *buffer)
{
struct IOStdReq *io = (struct IOStdReq *)dd->io;
io->io_Length = bytes;
io->io_Offset = offset;
io->io_Data = buffer;
if (!device_do_command (dd, CMD_READ)) {
return (io->io_Actual);
}
return (-1);
}
/* returns actual number of bytes written or -1 for error. */
ulong
device_write (struct device_data *dd, ulong offset, ulong bytes, void *buffer)
{
struct IOStdReq *io = (struct IOStdReq *)dd->io;
io->io_Length = bytes;
io->io_Offset = offset;
io->io_Data = buffer;
if (!device_do_command (dd, CMD_WRITE)) {
return (io->io_Actual);
}
return (-1);
}
/* returns the error from DoIO () */
int
device_do_command (struct device_data *dd, UWORD command)
{
int error = -1;
if (dd) {
if (dd->open) {
dd->io->io_Command = command;
error = (int) DoIO (dd->io);
} else {
dd->io->io_Error = -1;
}
}
return (error);
}
|
