ref: 8be7f27b758ef9ef818f68db0d8bcb7b038eae0e
dir: /sys/src/cmd/nusb/disk/disk.c/
/*
* usb/disk - usb mass storage file server
*
* supports only the scsi command interface, not ata.
*/
#include <u.h>
#include <libc.h>
#include <ctype.h>
#include <fcall.h>
#include <thread.h>
#include <9p.h>
#include "scsireq.h"
#include "usb.h"
#include "ums.h"
enum
{
Qdir = 0,
Qctl,
Qraw,
Qdata,
Qpart,
Qmax = Maxparts,
};
Dev *dev;
Ums *ums;
typedef struct Dirtab Dirtab;
struct Dirtab
{
char *name;
int mode;
};
ulong ctlmode = 0664;
/*
* Partition management (adapted from disk/partfs)
*/
Part *
lookpart(Umsc *lun, char *name)
{
Part *part, *p;
part = lun->part;
for(p=part; p < &part[Qmax]; p++){
if(p->inuse && strcmp(p->name, name) == 0)
return p;
}
return nil;
}
Part *
freepart(Umsc *lun)
{
Part *part, *p;
part = lun->part;
for(p=part; p < &part[Qmax]; p++){
if(!p->inuse)
return p;
}
return nil;
}
int
addpart(Umsc *lun, char *name, vlong start, vlong end, ulong mode)
{
Part *p;
if(start < 0 || start > end || end > lun->blocks){
werrstr("bad partition boundaries");
return -1;
}
p = lookpart(lun, name);
if(p != nil){
/* adding identical partition is no-op */
if(p->offset == start && p->length == end - start && p->mode == mode)
return 0;
werrstr("partition name already in use");
return -1;
}
p = freepart(lun);
if(p == nil){
werrstr("no free partition slots");
return -1;
}
p->inuse = 1;
free(p->name);
p->id = p - lun->part;
p->name = estrdup(name);
p->offset = start;
p->length = end - start;
p->mode = mode;
return 0;
}
int
delpart(Umsc *lun, char *s)
{
Part *p;
p = lookpart(lun, s);
if(p == nil || p->id <= Qdata){
werrstr("partition not found");
return -1;
}
p->inuse = 0;
free(p->name);
p->name = nil;
p->vers++;
return 0;
}
void
fixlength(Umsc *lun, vlong blocks)
{
Part *part, *p;
part = lun->part;
part[Qdata].length = blocks;
for(p=&part[Qdata+1]; p < &part[Qmax]; p++){
if(p->inuse && p->offset + p->length > blocks){
if(p->offset > blocks){
p->offset =blocks;
p->length = 0;
}else
p->length = blocks - p->offset;
}
}
}
void
makeparts(Umsc *lun)
{
addpart(lun, "/", 0, 0, DMDIR | 0555);
addpart(lun, "ctl", 0, 0, 0664);
addpart(lun, "raw", 0, 0, 0640);
addpart(lun, "data", 0, lun->blocks, 0640);
}
/*
* ctl parsing & formatting (adapted from partfs)
*/
static char*
ctlstring(Umsc *lun)
{
Part *p, *part;
Fmt fmt;
part = &lun->part[0];
fmtstrinit(&fmt);
if(lun->flags & Finqok)
fmtprint(&fmt, "inquiry %s\n", lun->inq);
fmtprint(&fmt, "dev %s\n", dev->dir);
fmtprint(&fmt, "lun %zd\n", lun - &ums->lun[0]);
if(lun->blocks > 0)
fmtprint(&fmt, "geometry %llud %ld\n", lun->blocks, lun->lbsize);
for (p = &part[Qdata+1]; p < &part[Qmax]; p++)
if (p->inuse)
fmtprint(&fmt, "part %s %lld %lld\n",
p->name, p->offset, p->offset + p->length);
return fmtstrflush(&fmt);
}
static int
ctlparse(Umsc *lun, char *msg)
{
vlong start, end;
char *argv[16];
int argc;
argc = tokenize(msg, argv, nelem(argv));
if(argc < 1){
werrstr("empty control message");
return -1;
}
if(strcmp(argv[0], "part") == 0){
if(argc != 4){
werrstr("part takes 3 args");
return -1;
}
start = strtoll(argv[2], 0, 0);
end = strtoll(argv[3], 0, 0);
return addpart(lun, argv[1], start, end, 0640);
}else if(strcmp(argv[0], "delpart") == 0){
if(argc != 2){
werrstr("delpart takes 1 arg");
return -1;
}
return delpart(lun, argv[1]);
}
werrstr("unknown ctl");
return -1;
}
/*
* These are used by scuzz scsireq
*/
int exabyte, force6bytecmds;
int diskdebug;
static int
getmaxlun(void)
{
uchar max;
int r;
max = 0;
r = Rd2h|Rclass|Riface;
if(usbcmd(dev, r, Getmaxlun, 0, 0, &max, 1) < 0){
dprint(2, "%s: %s: getmaxlun failed: %r\n", argv0, dev->dir);
}else{
max &= 017; /* 15 is the max. allowed */
dprint(2, "%s: %s: maxlun %d\n", argv0, dev->dir, max);
}
/* 0e8d:1887 does not respond to followup commands without a delay */
sleep(1);
return max;
}
static int
umsreset(void)
{
int r;
r = Rh2d|Rclass|Riface;
if(usbcmd(dev, r, Umsreset, 0, 0, nil, 0) < 0){
fprint(2, "%s: reset: %r\n", argv0);
return -1;
}
sleep(100);
return 0;
}
static int
umsrecover(void)
{
if(umsreset() < 0)
return -1;
if(unstall(dev, ums->epin, Ein) < 0)
dprint(2, "%s: unstall epin: %r\n", argv0);
/* do we need this when epin == epout? */
if(unstall(dev, ums->epout, Eout) < 0)
dprint(2, "%s: unstall epout: %r\n", argv0);
return 0;
}
static int
ispow2(uvlong ul)
{
return (ul & (ul - 1)) == 0;
}
/*
* return smallest power of 2 >= n
*/
static int
log2(int n)
{
int i;
for(i = 0; (1 << i) < n; i++)
;
return i;
}
static int
umsready(Umsc *lun)
{
int i;
for(i=0; i<3; i++){
if(SRready(lun) != -1)
break;
if(lun->status != Status_SD)
continue;
/*
* logical unit is in process of becoming ready
* or initializing command required
*/
if(lun->sense[12] == 0x04)
if(lun->sense[13] == 0x02 || lun->sense[13] == 0x01)
break;
/* medium not present */
if(lun->sense[12] == 0x3A)
return -1;
}
/* start unit */
if((lun->inquiry[0] & 0x1F) == 0){
SRstart(lun, 1);
sleep(250);
}
return 0;
}
static int
umscapacity(Umsc *lun)
{
uchar data[32];
lun->blocks = 0;
lun->capacity = 0;
lun->lbsize = 0;
memset(data, 0, sizeof data);
if(umsready(lun) < 0)
return -1;
if(SRrcapacity(lun, data) < 0)
return -1;
lun->blocks = GETBELONG(data);
lun->lbsize = GETBELONG(data+4);
if(lun->blocks == 0xFFFFFFFF){
if(SRrcapacity16(lun, data) < 0){
lun->lbsize = 0;
lun->blocks = 0;
return -1;
}else{
lun->lbsize = GETBELONG(data + 8);
lun->blocks = (uvlong)GETBELONG(data)<<32 |
GETBELONG(data + 4);
}
}
lun->blocks++; /* SRcapacity returns LBA of last block */
lun->capacity = (vlong)lun->blocks * lun->lbsize;
fixlength(lun, lun->blocks);
if(diskdebug)
fprint(2, "%s: logical block size %lud, # blocks %llud\n",
argv0, lun->lbsize, lun->blocks);
return 0;
}
static int
umsinit(void)
{
uchar i;
Umsc *lun;
int some;
umsreset();
ums->maxlun = getmaxlun();
ums->lun = mallocz((ums->maxlun+1) * sizeof(*ums->lun), 1);
some = 0;
for(i = 0; i <= ums->maxlun; i++){
lun = &ums->lun[i];
lun->ums = ums;
lun->umsc = lun;
lun->lun = i;
lun->flags = Fopen | Fusb | Frw10;
if(SRinquiry(lun) < 0 && SRinquiry(lun) < 0){
dprint(2, "%s: lun %d inquiry failed\n", argv0, i);
continue;
}
switch(lun->inquiry[0]){
case Devdir:
case Devworm: /* a little different than the others */
case Devcd:
case Devmo:
break;
default:
fprint(2, "%s: lun %d is not a disk (type %#02x)\n",
argv0, i, lun->inquiry[0]);
continue;
}
/*
* we ignore the device type reported by inquiry.
* Some devices return a wrong value but would still work.
*/
some++;
lun->inq = smprint("%.48s", (char *)lun->inquiry+8);
umscapacity(lun);
}
if(some == 0){
dprint(2, "%s: all luns failed\n", argv0);
return -1;
}
return 0;
}
/*
* called by SR*() commands provided by scuzz's scsireq
*/
long
umsrequest(Umsc *umsc, ScsiPtr *cmd, ScsiPtr *data, int *status)
{
Cbw cbw;
Csw csw;
int n, nio;
Ums *ums;
ums = umsc->ums;
memcpy(cbw.signature, "USBC", 4);
cbw.tag = ++ums->seq;
cbw.datalen = data->count;
cbw.flags = data->write? CbwDataOut: CbwDataIn;
cbw.lun = umsc->lun;
if(cmd->count < 1 || cmd->count > 16)
fprint(2, "%s: umsrequest: bad cmd count: %ld\n", argv0, cmd->count);
cbw.len = cmd->count;
assert(cmd->count <= sizeof(cbw.command));
memcpy(cbw.command, cmd->p, cmd->count);
memset(cbw.command + cmd->count, 0, sizeof(cbw.command) - cmd->count);
werrstr(""); /* we use %r later even for n == 0 */
if(diskdebug){
fprint(2, "%s: cmd: tag %#lx: ", argv0, cbw.tag);
for(n = 0; n < cbw.len; n++)
fprint(2, " %2.2x", cbw.command[n]&0xFF);
fprint(2, " datalen: %ld\n", cbw.datalen);
}
/* issue tunnelled scsi command */
if(write(ums->epout->dfd, &cbw, CbwLen) != CbwLen){
fprint(2, "%s: cmd: %r\n", argv0);
goto Fail;
}
/* transfer the data */
nio = data->count;
if(nio != 0){
if(data->write)
n = write(ums->epout->dfd, data->p, nio);
else{
n = read(ums->epin->dfd, data->p, nio);
if (n >= 0 && n < nio) /* didn't fill data->p? */
memset(data->p + n, 0, nio - n);
}
if(diskdebug)
if(n < 0)
fprint(2, "%s: data: %r\n", argv0);
else
fprint(2, "%s: data: %d bytes (nio: %d)\n", argv0, n, nio);
nio = n;
if(n <= 0){
nio = 0;
if(data->write == 0)
unstall(dev, ums->epin, Ein);
}
}
/* read the transfer's status */
n = read(ums->epin->dfd, &csw, CswLen);
if(n <= 0){
/* n == 0 means "stalled" */
unstall(dev, ums->epin, Ein);
n = read(ums->epin->dfd, &csw, CswLen);
}
if(n != CswLen || strncmp(csw.signature, "USBS", 4) != 0){
dprint(2, "%s: read n=%d: status: %r\n", argv0, n);
goto Fail;
}
if(csw.tag != cbw.tag){
dprint(2, "%s: status tag mismatch\n", argv0);
goto Fail;
}
if(csw.status >= CswPhaseErr){
dprint(2, "%s: phase error\n", argv0);
goto Fail;
}
if(csw.dataresidue == 0 || ums->wrongresidues)
csw.dataresidue = data->count - nio;
if(diskdebug){
fprint(2, "%s: status: %2.2ux residue: %ld\n",
argv0, csw.status, csw.dataresidue);
if(cbw.command[0] == ScmdRsense){
fprint(2, "sense data:");
for(n = 0; n < data->count - csw.dataresidue; n++)
fprint(2, " %2.2x", data->p[n]);
fprint(2, "\n");
}
}
switch(csw.status){
case CswOk:
*status = STok;
break;
case CswFailed:
*status = STcheck;
break;
default:
dprint(2, "%s: phase error\n", argv0);
goto Fail;
}
ums->nerrs = 0;
return data->count - csw.dataresidue;
Fail:
*status = STharderr;
if(ums->nerrs++ > 15)
sysfatal("%s: too many errors", dev->dir);
umsrecover();
return -1;
}
static void
dattach(Req *req)
{
req->fid->qid = (Qid) {0, 0, QTDIR};
req->ofcall.qid = req->fid->qid;
respond(req, nil);
}
static char *
dwalk(Fid *fid, char *name, Qid *qid)
{
Umsc *lun;
Part *p;
if((fid->qid.type & QTDIR) == 0)
return "walk in non-directory";
if(strcmp(name, "..") == 0){
fid->qid = (Qid){0, 0, QTDIR};
*qid = fid->qid;
return nil;
}
if(fid->qid.path == 0){
for(lun = ums->lun; lun <= ums->lun + ums->maxlun; lun++)
if(strcmp(lun->name, name) == 0){
fid->qid.path = (lun - ums->lun + 1) << 16;
fid->qid.vers = 0;
fid->qid.type = QTDIR;
*qid = fid->qid;
return nil;
}
return "file does not exist";
}
lun = ums->lun + (fid->qid.path >> 16) - 1;
p = lookpart(lun, name);
if(p == nil)
return "file does not exist";
fid->qid.path |= p->id;
fid->qid.vers = p->vers;
fid->qid.type = p->mode >> 24;
*qid = fid->qid;
return nil;
}
static void
dostat(Umsc *lun, int path, Dir *d)
{
Part *p;
p = &lun->part[path];
d->qid.path = path;
d->qid.vers = p->vers;
d->qid.type =p->mode >> 24;
d->mode = p->mode;
d->length = (vlong) p->length * lun->lbsize;
d->name = strdup(p->name);
d->uid = strdup(getuser());
d->gid = strdup(d->uid);
d->muid = strdup(d->uid);
}
static int
dirgen(int n, Dir* d, void *aux)
{
Umsc *lun;
int i;
lun = aux;
for(i = Qctl; i < Qmax; i++){
if(lun->part[i].inuse == 0)
continue;
if(n-- == 0)
break;
}
if(i == Qmax)
return -1;
dostat(lun, i, d);
d->qid.path |= (lun - ums->lun) << 16;
return 0;
}
static int
rootgen(int n, Dir *d, void *)
{
Umsc *lun;
if(n > ums->maxlun)
return -1;
lun = ums->lun + n;
d->qid.path = (n + 1) << 16;
d->qid.type = QTDIR;
d->mode = 0555 | DMDIR;
d->name = strdup(lun->name);
d->uid = strdup(getuser());
d->gid = strdup(d->uid);
d->muid = strdup(d->uid);
return 0;
}
static void
dstat(Req *req)
{
int path;
Dir *d;
Umsc *lun;
d = &req->d;
d->qid = req->fid->qid;
if(req->fid->qid.path == 0){
d->name = strdup("");
d->mode = 0555 | DMDIR;
d->uid = strdup(getuser());
d->gid = strdup(d->uid);
d->muid = strdup(d->uid);
}else{
path = req->fid->qid.path & 0xFFFF;
lun = ums->lun + (req->fid->qid.path >> 16) - 1;
dostat(lun, path, d);
}
respond(req, nil);
}
static void
dopen(Req *req)
{
ulong path;
Umsc *lun;
if(req->ofcall.qid.path == 0){
respond(req, nil);
return;
}
path = req->ofcall.qid.path & 0xFFFF;
lun = ums->lun + (req->ofcall.qid.path >> 16) - 1;
switch(path){
case Qraw:
srvrelease(req->srv);
qlock(lun);
lun->phase = Pcmd;
qunlock(lun);
srvacquire(req->srv);
/* wet floor */
case Qdata:
case Qpart:
req->ofcall.iounit = Maxiosize;
break;
}
respond(req, nil);
}
/*
* check i/o parameters and compute values needed later.
* we shift & mask manually to avoid run-time calls to _divv and _modv,
* since we don't need general division nor its cost.
*/
static int
setup(Umsc *lun, Part *p, char *data, int count, vlong offset)
{
long nb, lbsize, lbshift, lbmask;
uvlong bno;
if(count < 0 || lun->lbsize <= 0 && umscapacity(lun) < 0 ||
lun->lbsize == 0)
return -1;
lbsize = lun->lbsize;
assert(ispow2(lbsize));
lbshift = log2(lbsize);
lbmask = lbsize - 1;
bno = offset >> lbshift; /* offset / lbsize */
nb = ((offset + count + lbsize - 1) >> lbshift) - bno;
if(bno + nb > p->length) /* past end of partition? */
nb = p->length - bno;
if(nb * lbsize > Maxiosize)
nb = Maxiosize / lbsize;
lun->nb = nb;
if(bno >= p->length || nb == 0)
return 0;
bno += p->offset; /* start of partition */
lun->offset = bno;
lun->off = offset & lbmask; /* offset % lbsize */
if(lun->off == 0 && (count & lbmask) == 0)
lun->bufp = data;
else
/* not transferring full, aligned blocks; need intermediary */
lun->bufp = lun->buf;
return count;
}
/*
* Upon SRread/SRwrite errors we assume the medium may have changed,
* and ask again for the capacity of the media.
* BUG: How to proceed to avoid confussing dossrv??
*/
static void
dread(Req *req)
{
long n;
ulong path;
char buf[64];
char *s;
Part *p;
Umsc *lun;
Qid q;
long count;
void *data;
vlong offset;
Srv *srv;
q = req->fid->qid;
if(q.path == 0){
dirread9p(req, rootgen, nil);
respond(req, nil);
return;
}
path = q.path & 0xFFFF;
lun = ums->lun + (q.path >> 16) - 1;
count = req->ifcall.count;
data = req->ofcall.data;
offset = req->ifcall.offset;
switch(path){
case Qdir:
dirread9p(req, dirgen, lun);
respond(req, nil);
return;
case Qctl:
s = ctlstring(lun);
readstr(req, s);
free(s);
respond(req, nil);
return;
}
srv = req->srv;
srvrelease(srv);
qlock(lun);
switch(path){
case Qraw:
switch(lun->phase){
case Pcmd:
respond(req, "phase error");
break;
case Pdata:
lun->data.p = data;
lun->data.count = count;
lun->data.write = 0;
count = umsrequest(lun,&lun->cmd,&lun->data,&lun->status);
lun->phase = Pstatus;
if(count < 0){
lun->lbsize = 0; /* medium may have changed */
responderror(req);
}else{
req->ofcall.count = count;
respond(req, nil);
}
break;
case Pstatus:
n = snprint(buf, sizeof buf, "%11.0ud ", lun->status);
readbuf(req, buf, n);
lun->phase = Pcmd;
respond(req, nil);
break;
}
break;
case Qdata:
default:
p = &lun->part[path];
if(!p->inuse){
respond(req, "permission denied");
break;
}
count = setup(lun, p, data, count, offset);
if (count <= 0){
responderror(req);
break;
}
n = SRread(lun, lun->bufp, lun->nb * lun->lbsize);
if(n < 0){
lun->lbsize = 0; /* medium may have changed */
responderror(req);
break;
} else if (lun->bufp == data)
count = n;
else{
/*
* if n == lun->nb*lun->lbsize (as expected),
* just copy count bytes.
*/
if(lun->off + count > n)
count = n - lun->off; /* short read */
if(count > 0)
memmove(data, lun->bufp + lun->off, count);
}
req->ofcall.count = count;
respond(req, nil);
break;
}
qunlock(lun);
srvacquire(srv);
}
static void
dwrite(Req *req)
{
long len, ocount;
ulong path;
uvlong bno;
Part *p;
Umsc *lun;
char *s;
long count;
void *data;
vlong offset;
Srv *srv;
lun = ums->lun + (req->fid->qid.path >> 16) - 1;
path = req->fid->qid.path & 0xFFFF;
count = req->ifcall.count;
data = req->ifcall.data;
offset = req->ifcall.offset;
srv = req->srv;
srvrelease(srv);
qlock(lun);
switch(path){
case Qctl:
s = emallocz(count+1, 1);
memmove(s, data, count);
if(s[count-1] == '\n')
s[count-1] = 0;
if(ctlparse(lun, s) == -1)
responderror(req);
else{
req->ofcall.count = count;
respond(req, nil);
}
free(s);
break;
case Qraw:
switch(lun->phase){
case Pcmd:
if(count != 6 && count != 10 && count != 12 && count != 16){
respond(req, "bad command length");
break;
}
memmove(lun->rawcmd, data, count);
lun->cmd.p = lun->rawcmd;
lun->cmd.count = count;
lun->cmd.write = 1;
lun->phase = Pdata;
req->ofcall.count = count;
respond(req, nil);
break;
case Pdata:
lun->data.p = data;
lun->data.count = count;
lun->data.write = 1;
count = umsrequest(lun,&lun->cmd,&lun->data,&lun->status);
lun->phase = Pstatus;
if(count < 0){
lun->lbsize = 0; /* medium may have changed */
responderror(req);
}else{
req->ofcall.count = count;
respond(req, nil);
}
break;
case Pstatus:
lun->phase = Pcmd;
respond(req, "phase error");
break;
}
break;
case Qdata:
default:
p = &lun->part[path];
if(!p->inuse){
respond(req, "permission denied");
break;
}
len = ocount = count;
count = setup(lun, p, data, count, offset);
if (count <= 0){
responderror(req);
break;
}
bno = lun->offset;
if (lun->bufp == lun->buf) {
count = SRread(lun, lun->bufp, lun->nb * lun->lbsize);
if(count < 0) {
lun->lbsize = 0; /* medium may have changed */
responderror(req);
break;
}
/*
* if count == lun->nb*lun->lbsize, as expected, just
* copy len (the original count) bytes of user data.
*/
if(lun->off + len > count)
len = count - lun->off; /* short read */
if(len > 0)
memmove(lun->bufp + lun->off, data, len);
}
lun->offset = bno;
count = SRwrite(lun, lun->bufp, lun->nb * lun->lbsize);
if(count < 0){
lun->lbsize = 0; /* medium may have changed */
responderror(req);
break;
}else{
if(lun->off + len > count)
count -= lun->off; /* short write */
/* never report more bytes written than requested */
if(count < 0)
count = 0;
else if(count > ocount)
count = ocount;
}
req->ofcall.count = count;
respond(req, nil);
break;
}
qunlock(lun);
srvacquire(srv);
}
static int
findendpoints(Ums *ums, int proto)
{
Ep *ep, *ein, *eout;
Iface *ifc;
Usbdev *ud;
int i, j;
ud = dev->usb;
for(i = 0; i < nelem(ud->conf[0]->iface); i++){
for(ifc = ud->conf[0]->iface[i]; ifc != nil; ifc = ifc->next){
if(Class(ifc->csp) != Clstorage)
continue;
if(Proto(ifc->csp) != proto)
continue;
ein = eout = nil;
for(j = 0; j < nelem(ifc->ep); j++){
ep = ifc->ep[j];
if(ep == nil)
break;
if(ep->type != Ebulk)
continue;
if(ep->dir == Eboth || ep->dir == Ein)
if(ein == nil)
ein = ep;
if(ep->dir == Eboth || ep->dir == Eout)
if(eout == nil)
eout = ep;
if(ein != nil && eout != nil){
dprint(2, "%s: ifc %d csp %lux ep ids: in %d out %d\n",
argv0, ifc->id, ifc->csp, ein->id, eout->id);
goto Found;
}
}
}
}
werrstr("no endpoints found");
return -1;
Found:
if(ifc->alt != 0 && setalt(dev, ifc) < 0)
return -1;
ums->epin = openep(dev, ein);
if(ums->epin == nil)
return -1;
if(ein == eout){
incref(ums->epin);
ums->epout = ums->epin;
}else
ums->epout = openep(dev, eout);
if(ums->epout == nil){
closedev(ums->epin);
return -1;
}
if(ums->epin == ums->epout)
opendevdata(ums->epin, ORDWR);
else{
opendevdata(ums->epin, OREAD);
opendevdata(ums->epout, OWRITE);
}
if(ums->epin->dfd < 0 || ums->epout->dfd < 0){
closedev(ums->epin);
closedev(ums->epout);
return -1;
}
dprint(2, "%s: ep in %s out %s\n", argv0, ums->epin->dir, ums->epout->dir);
devctl(ums->epin, "timeout 2000");
devctl(ums->epout, "timeout 2000");
if(usbdebug > 1 || diskdebug > 2){
devctl(ums->epin, "debug 1");
devctl(ums->epout, "debug 1");
devctl(dev, "debug 1");
}
return 0;
}
static void
usage(void)
{
fprint(2, "usage: %s [-d] devid\n", argv0);
exits("usage");
}
/*
* some devices like usb modems appear as mass storage
* for windows driver installation. switch mode here
* and exit if we detect one so the real driver can
* attach it.
*/
static void
notreallyums(Dev *dev)
{
/* HUAWEI E220 */
if(dev->usb->vid == 0x12d1 && dev->usb->did == 0x1003){
usbcmd(dev, Rh2d|Rstd|Rdev, Rsetfeature, Fdevremotewakeup, 0x02, nil, 0);
exits("mode switch");
}
}
static Srv diskfs = {
.attach = dattach,
.walk1 = dwalk,
.open = dopen,
.read = dread,
.write = dwrite,
.stat = dstat,
};
void
main(int argc, char **argv)
{
Umsc *lun;
int i;
char buf[20];
ARGBEGIN{
case 'D':
chatty9p++;
break;
case 'd':
scsidebug(diskdebug);
diskdebug++;
usbdebug++;
break;
default:
usage();
}ARGEND
if(argc != 1)
usage();
dev = getdev(*argv);
if(dev == nil)
sysfatal("getdev: %r");
notreallyums(dev);
ums = dev->aux = emallocz(sizeof(Ums), 1);
ums->maxlun = -1;
if(findendpoints(ums, Protobulk) < 0
&& findendpoints(ums, Protouas) < 0)
sysfatal("findendpoints: %r\n");
/*
* SanDISK 512M gets residues wrong.
*/
if(dev->usb->vid == 0x0781 && dev->usb->did == 0x5150)
ums->wrongresidues = 1;
if(umsinit() < 0)
sysfatal("umsinit: %r\n");
for(i = 0; i <= ums->maxlun; i++){
lun = &ums->lun[i];
if(ums->maxlun > 0)
snprint(lun->name, sizeof(lun->name), "sdU%s.%d", dev->hname, i);
else
snprint(lun->name, sizeof(lun->name), "sdU%s", dev->hname);
makeparts(lun);
}
snprint(buf, sizeof buf, "%d.disk", dev->id);
postsharesrv(&diskfs, nil, "usb", buf);
exits(nil);
}