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[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [include/] [scsi/] [sg.h] - Rev 1765
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/* History: Started: Aug 9 by Lawrence Foard (entropy@world.std.com), to allow user process control of SCSI devices. Development Sponsored by Killy Corp. NY NY */ #ifndef _SCSI_GENERIC_H #define _SCSI_GENERIC_H /* An SG device is accessed by writing "packets" to it, the replies are then read using the read call. The same header is used for reply, just ignore reply_len field. */ struct sg_header { int pack_len; /* length of incoming packet <4096 (including header) */ int reply_len; /* maximum length <4096 of expected reply */ int pack_id; /* id number of packet */ int result; /* 0==ok, otherwise refer to errno codes */ unsigned int twelve_byte:1; /* Force 12 byte command length for group 6 & 7 commands */ unsigned int other_flags:31; /* for future use */ unsigned char sense_buffer[16]; /* used only by reads */ /* command follows then data for command */ }; /* ioctl's */ #define SG_SET_TIMEOUT 0x2201 /* set timeout *(int *)arg==timeout */ #define SG_GET_TIMEOUT 0x2202 /* get timeout return timeout */ #define SG_DEFAULT_TIMEOUT (60*HZ) /* 1 minute timeout */ #define SG_DEFAULT_RETRIES 1 #define SG_MAX_QUEUE 4 /* maximum outstanding request, arbitrary, may be changed if sufficient DMA buffer room available */ #define SG_BIG_BUFF 32768 #endif