ref: 5c1feb0ef0b795e5de71e956f9ccddcd5c4b7f21
dir: /sys/src/cmd/nusb/disk/ums.h/
/*
* mass storage transport protocols and subclasses,
* from usb mass storage class specification overview rev 1.2
*/
typedef struct Umsc Umsc;
typedef struct Ums Ums;
typedef struct Cbw Cbw; /* command block wrapper */
typedef struct Csw Csw; /* command status wrapper */
typedef struct Part Part;
enum
{
Protocbi = 0, /* control/bulk/interrupt; mainly floppies */
Protocb = 1, /* " with no interrupt; mainly floppies */
Protobulk = 0x50, /* bulk only */
Subrbc = 1, /* reduced blk cmds */
Subatapi = 2, /* cd/dvd using sff-8020i or mmc-2 cmd blks */
Subqic = 3, /* QIC-157 tapes */
Subufi = 4, /* floppy */
Sub8070 = 5, /* removable media, atapi-like */
Subscsi = 6, /* scsi transparent cmd set */
Subisd200 = 7, /* ISD200 ATA */
Subdev = 0xff, /* use device's value */
Umsreset = 0xFF,
Getmaxlun = 0xFE,
// Maxlun = 256,
Maxlun = 32,
CMreset = 1,
Pcmd = 0,
Pdata,
Pstatus,
CbwLen = 31,
CbwDataIn = 0x80,
CbwDataOut = 0x00,
CswLen = 13,
CswOk = 0,
CswFailed = 1,
CswPhaseErr = 2,
Maxparts = 16,
};
/*
* corresponds to a lun.
* these are ~600+Maxiosize bytes each; ScsiReq is not tiny.
*/
struct Part
{
int id;
int inuse;
int vers;
ulong mode;
char *name;
vlong offset; /* in lbsize units */
vlong length; /* in lbsize units */
};
struct Umsc
{
ScsiReq;
char name[40];
uvlong blocks;
vlong capacity;
/* from setup */
char *bufp;
long off; /* offset within a block */
long nb; /* byte count */
QLock;
/* partitions */
Part part[Maxparts];
uchar rawcmd[16];
uchar phase;
char *inq;
Ums *ums;
char buf[Maxiosize];
};
struct Ums
{
Dev *epin;
Dev *epout;
Umsc *lun;
uchar maxlun;
int seq;
int nerrs;
int wrongresidues;
};
/*
* USB transparent SCSI devices
*/
struct Cbw
{
char signature[4]; /* "USBC" */
long tag;
long datalen;
uchar flags;
uchar lun;
uchar len;
char command[16];
};
struct Csw
{
char signature[4]; /* "USBS" */
long tag;
long dataresidue;
uchar status;
};