EMILE/libscsi/scsi_open.c

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/*
*
* (c) 2005 Laurent Vivier <Laurent@lvivier.info>
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*
*/
#include <stdio.h>
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#include <stdlib.h>
#include <scsi/scsi.h>
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#include <macos/errors.h>
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#include "libscsi.h"
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#define BUFFER_SIZE (255)
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scsi_device_t *scsi_open(int target)
{
scsi_device_t *dev;
unsigned char buff[BUFFER_SIZE];
OSErr err;
int retries;
err = scsi_INQUIRY(target, buff, BUFFER_SIZE);
if (err != noErr)
printf("WARNING: cannot execute INQUIRY\n");
retries = 0;
while (retries < 300)
{
err = scsi_TEST_UNIT_READY(target);
retries++;
if (err == noErr) {
err = scsi_REQUEST_SENSE(target, buff, BUFFER_SIZE);
if ((err == noErr) && (buff[2] != UNIT_ATTENTION) &&
(buff[2] != NOT_READY))
break;
}
}
if (retries == 300)
{
printf("ERROR: unit not ready !\n");
return NULL;
}
retries = 0;
while (retries < 3)
{
err = scsi_READ_CAPACITY(target, buff, BUFFER_SIZE);
if (err == noErr)
break;
retries++;
}
if (err != noErr) {
printf("ERROR: cannot execute READ_CAPACITY\n");
return NULL;
}
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dev = (scsi_device_t *)malloc(sizeof(scsi_device_t));
if (dev == NULL)
return NULL;
dev->target = target;
dev->capacity = (buff[0] << 24) | (buff[1] << 16) | (buff[2] << 8) | buff[3];
dev->sector_size = (buff[4] << 24) | (buff[5] << 16) | (buff[6] << 8) | buff[7];
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if ((dev->sector_size != 512) && (dev->sector_size != 2048))
{
dev->sector_size = 2048;
}
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return dev;
}