/*
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/*
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History:
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History:
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Started: Aug 9 by Lawrence Foard (entropy@world.std.com), to allow user
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Started: Aug 9 by Lawrence Foard (entropy@world.std.com), to allow user
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process control of SCSI devices.
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process control of SCSI devices.
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Development Sponsored by Killy Corp. NY NY
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Development Sponsored by Killy Corp. NY NY
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*/
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*/
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#ifndef _SCSI_GENERIC_H
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#ifndef _SCSI_GENERIC_H
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#define _SCSI_GENERIC_H
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#define _SCSI_GENERIC_H
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/*
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/*
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An SG device is accessed by writing "packets" to it, the replies
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An SG device is accessed by writing "packets" to it, the replies
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are then read using the read call. The same header is used for
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are then read using the read call. The same header is used for
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reply, just ignore reply_len field.
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reply, just ignore reply_len field.
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*/
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*/
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struct sg_header
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struct sg_header
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{
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{
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int pack_len; /* length of incoming packet <4096 (including header) */
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int pack_len; /* length of incoming packet <4096 (including header) */
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int reply_len; /* maximum length <4096 of expected reply */
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int reply_len; /* maximum length <4096 of expected reply */
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int pack_id; /* id number of packet */
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int pack_id; /* id number of packet */
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int result; /* 0==ok, otherwise refer to errno codes */
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int result; /* 0==ok, otherwise refer to errno codes */
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unsigned int twelve_byte:1; /* Force 12 byte command length for group 6 & 7 commands */
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unsigned int twelve_byte:1; /* Force 12 byte command length for group 6 & 7 commands */
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unsigned int other_flags:31; /* for future use */
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unsigned int other_flags:31; /* for future use */
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unsigned char sense_buffer[16]; /* used only by reads */
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unsigned char sense_buffer[16]; /* used only by reads */
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/* command follows then data for command */
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/* command follows then data for command */
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};
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};
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/* ioctl's */
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/* ioctl's */
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#define SG_SET_TIMEOUT 0x2201 /* set timeout *(int *)arg==timeout */
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#define SG_SET_TIMEOUT 0x2201 /* set timeout *(int *)arg==timeout */
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#define SG_GET_TIMEOUT 0x2202 /* get timeout return timeout */
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#define SG_GET_TIMEOUT 0x2202 /* get timeout return timeout */
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#define SG_DEFAULT_TIMEOUT (60*HZ) /* 1 minute timeout */
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#define SG_DEFAULT_TIMEOUT (60*HZ) /* 1 minute timeout */
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#define SG_DEFAULT_RETRIES 1
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#define SG_DEFAULT_RETRIES 1
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#define SG_MAX_QUEUE 4 /* maximum outstanding request, arbitrary, may be
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#define SG_MAX_QUEUE 4 /* maximum outstanding request, arbitrary, may be
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changed if sufficient DMA buffer room available */
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changed if sufficient DMA buffer room available */
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#define SG_BIG_BUFF 32768
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#define SG_BIG_BUFF 32768
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#endif
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#endif
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