ref: 02ac617541ca1a7bf82b1615fb5a58235469b5d3
dir: /appl/lib/usb/usbmass.b/
#
# Copyright © 2001 Vita Nuova Holdings Limited.
#
implement UsbDriver;
include "sys.m";
sys: Sys;
include "usb.m";
usb: Usb;
Endpt, RD2H, RH2D: import Usb;
ENDPOINT_STALL: con 0; # TO DO: should be in usb.m
readerpid: int;
setupfd, ctlfd: ref Sys->FD;
infd, outfd: ref Sys->FD;
inep, outep: ref Endpt;
cbwseq := 0;
capacity: big;
debug := 0;
lun: int;
blocksize: int;
kill(pid: int)
{
fd := sys->open("#p/"+string pid+"/ctl", Sys->OWRITE);
if (fd != nil)
sys->fprint(fd, "kill");
}
reader(pidc: chan of int, fileio: ref Sys->FileIO)
{
pid := sys->pctl(0, nil);
pidc <-= pid;
for(;;) alt{
(offset, count, nil, rc) := <-fileio.read =>
if (rc != nil) {
if (offset%blocksize || count%blocksize) {
rc <- = (nil, "unaligned read");
continue;
}
offset /= blocksize;
count /= blocksize;
buf := array [count * blocksize] of byte;
if (scsiread10(lun, offset, count, buf) < 0) {
scsirequestsense(lun);
rc <- = (nil, "read error");
continue;
}
rc <- = (buf, nil);
}
(offset, data, nil, wc) := <-fileio.write =>
if(wc != nil){
count := len data;
if(offset%blocksize || count%blocksize){
wc <-= (0, "unaligned write");
continue;
}
offset /= blocksize;
count /= blocksize;
if(scsiwrite10(lun, offset, count, data) < 0){
scsirequestsense(lun);
wc <-= (0, "write error");
continue;
}
wc <-= (len data, nil);
}
}
readerpid = -1;
}
massstoragereset(): int
{
if (usb->setup(setupfd, Usb->RH2D | Usb->Rclass | Usb->Rinterface, 255, 0, 0, nil, nil) < 0) {
sys->print("usbmass: storagereset failed\n");
return -1;
}
return 0;
}
getmaxlun(): int
{
buf := array[1] of byte;
if (usb->setup(setupfd, Usb->RD2H | Usb->Rclass | Usb->Rinterface, 254, 0, 0, nil, buf) < 0) {
sys->print("usbmass: getmaxlun failed\n");
return -1;
}
return int buf[0];
}
#
# CBW:
# sig[4]="USBC" tag[4] datalen[4] flags[1] lun[1] len[1] cmd[len]
#
sendcbw(dtl: int, outdir: int, lun: int, cmd: array of byte): int
{
cbw := array [31] of byte;
cbw[0] = byte 'U';
cbw[1] = byte 'S';
cbw[2] = byte 'B';
cbw[3] = byte 'C';
usb->put4(cbw[4:], ++cbwseq);
usb->put4(cbw[8:], dtl);
if (outdir)
cbw[12] = byte RH2D;
else
cbw[12] = byte RD2H;
cbw[13] = byte lun;
cbw[14] = byte len cmd;
cbw[15:] = cmd;
rv := sys->write(outfd, cbw, len cbw);
if (rv < 0) {
sys->print("sendcbw: failed: %r\n");
return -1;
}
if (rv != len cbw) {
sys->print("sendcbw: truncated send\n");
return -1;
}
return 0;
}
#
# CSW:
# sig[4]="USBS" tag[4] residue[4] status[1]
#
recvcsw(tag: int): (int, int)
{
if(debug)
sys->print("recvcsw\n");
buf := array [13] of byte;
if (sys->read(infd, buf, len buf) != len buf) {
sys->print("recvcsw: read failed: %r\n");
return (-1, -1);
}
if (usb->get4(buf) != (('S'<<24)|('B'<<16)|('S'<<8)|'U')) {
sys->print("recvcsw: signature wrong\n");
return (-1, -1);
}
recvtag := usb->get4(buf[4:]);
if (recvtag != tag) {
sys->print("recvcsw: tag does not match: sent %d recved %d\n", tag, recvtag);
return (-1, -1);
}
residue := usb->get4(buf[8:]);
status := int buf[12];
if(debug)
sys->print("recvcsw: residue %d status %d\n", residue, status);
return (residue, status);
}
unstall(ep: ref Endpt)
{
if(debug)
sys->print("unstalling bulk %x\n", ep.addr);
x := ep.addr & 16rF;
sys->fprint(ctlfd, "unstall %d", x);
sys->fprint(ctlfd, "data %d 0", x);
if (usb->setclear_feature(setupfd, Usb->Rendpt, ENDPOINT_STALL, ep.addr, 0) < 0) {
sys->print("unstall: clear_feature() failed: %r\n");
return;
}
}
warnfprint(fd: ref Sys->FD, s: string)
{
if (sys->fprint(fd, "%s", s) != len s)
sys->print("warning: writing %s failed: %r\n", s);
}
bulkread(lun: int, cmd: array of byte, buf: array of byte, dump: int): int
{
if (sendcbw(len buf, 0, lun, cmd) < 0)
return -1;
got := 0;
if (buf != nil) {
while (got < len buf) {
rv := sys->read(infd, buf[got:], len buf - got);
if (rv < 0) {
sys->print("bulkread: read failed: %r\n");
break;
}
if(debug)
sys->print("read %d\n", rv);
got += rv;
break;
}
if (dump) {
for (i := 0; i < got; i++)
sys->print("%.2ux", int buf[i]);
sys->print("\n");
}
if (got == 0)
unstall(inep);
}
(residue, status) := recvcsw(cbwseq);
if (residue < 0) {
unstall(inep);
(residue, status) = recvcsw(cbwseq);
if (residue < 0)
return -1;
}
if (status != 0)
return -1;
return got;
}
bulkwrite(lun: int, cmd: array of byte, buf: array of byte): int
{
if (sendcbw(len buf, 1, lun, cmd) < 0)
return -1;
got := 0;
if (buf != nil) {
while (got < len buf) {
rv := sys->write(outfd, buf[got:], len buf - got);
if (rv < 0) {
sys->print("bulkwrite: write failed: %r\n");
break;
}
if(debug)
sys->print("write %d\n", rv);
got += rv;
break;
}
if (got == 0)
unstall(outep);
}
(residue, status) := recvcsw(cbwseq);
if (residue < 0) {
unstall(inep);
(residue, status) = recvcsw(cbwseq);
if (residue < 0)
return -1;
}
if (status != 0)
return -1;
return got;
}
scsiinquiry(lun: int): int
{
buf := array [36] of byte; # don't use 255, many devices can't cope
cmd := array [6] of byte;
cmd[0] = byte 16r12;
cmd[1] = byte (lun << 5);
cmd[2] = byte 0;
cmd[3] = byte 0;
cmd[4] = byte len buf;
cmd[5] = byte 0;
got := bulkread(lun, cmd, buf, 0);
if (got < 0)
return -1;
if (got < 36) {
sys->print("scsiinquiry: too little data\n");
return -1;
}
t := int buf[0] & 16r1f;
if(debug)
sys->print("scsiinquiry: type %d/%s\n", t, string buf[8:35]);
if (t != 0)
return -1;
return 0;
}
scsireadcapacity(lun: int): int
{
# warnfprint(ctlfd, "debug 0 1");
# warnfprint(ctlfd, "debug 1 1");
# warnfprint(ctlfd, "debug 2 1");
buf := array [8] of byte;
cmd := array [10] of byte;
cmd[0] = byte 16r25;
cmd[1] = byte (lun << 5);
cmd[2] = byte 0;
cmd[3] = byte 0;
cmd[4] = byte 0;
cmd[5] = byte 0;
cmd[6] = byte 0;
cmd[7] = byte 0;
cmd[8] = byte 0;
cmd[9] = byte 0;
got := bulkread(lun, cmd, buf, 0);
if (got < 0)
return -1;
if (got != len buf) {
sys->print("scsireadcapacity: returned data not right size\n");
return -1;
}
blocksize = usb->bigget4(buf[4:]);
lba := big usb->bigget4(buf[0:]) & 16rFFFFFFFF;
capacity = big blocksize * (lba+big 1);
if(debug)
sys->print("block size %d lba %bd cap %bd\n", blocksize, lba, capacity);
return 0;
}
scsirequestsense(lun: int): int
{
# warnfprint(ctlfd, "debug 0 1");
# warnfprint(ctlfd, "debug 1 1");
# warnfprint(ctlfd, "debug 2 1");
buf := array [18] of byte;
cmd := array [6] of byte;
cmd[0] = byte 16r03;
cmd[1] = byte (lun << 5);
cmd[2] = byte 0;
cmd[3] = byte 0;
cmd[4] = byte len buf;
cmd[5] = byte 0;
got := bulkread(lun, cmd, buf, 1);
if (got < 0)
return -1;
return 0;
}
scsiread10(lun: int, offset, count: int, buf: array of byte): int
{
cmd := array [10] of byte;
cmd[0] = byte 16r28;
cmd[1] = byte (lun << 5);
usb->bigput4(cmd[2:], offset);
cmd[6] = byte 0;
usb->bigput2(cmd[7:], count);
cmd[9] = byte 0;
got := bulkread(lun, cmd, buf, 0);
if (got < 0)
return -1;
return 0;
}
scsiwrite10(lun: int, offset, count: int, buf: array of byte): int
{
cmd := array [10] of byte;
cmd[0] = byte 16r2A;
cmd[1] = byte (lun << 5);
usb->bigput4(cmd[2:], offset);
cmd[6] = byte 0;
usb->bigput2(cmd[7:], count);
cmd[9] = byte 0;
got := bulkwrite(lun, cmd, buf);
if (got < 0)
return -1;
return 0;
}
scsistartunit(lun: int, start: int): int
{
# warnfprint(ctlfd, "debug 0 1");
# warnfprint(ctlfd, "debug 1 1");
# warnfprint(ctlfd, "debug 2 1");
cmd := array [6] of byte;
cmd[0] = byte 16r1b;
cmd[1] = byte (lun << 5);
cmd[2] = byte 0;
cmd[3] = byte 0;
cmd[4] = byte (start & 1);
cmd[5] = byte 0;
got := bulkread(lun, cmd, nil, 0);
if (got < 0)
return -1;
return 0;
}
init(usbmod: Usb, psetupfd, pctlfd: ref Sys->FD,
nil: ref Usb->Device,
conf: array of ref Usb->Configuration, path: string): int
{
usb = usbmod;
setupfd = psetupfd;
ctlfd = pctlfd;
sys = load Sys Sys->PATH;
rv := usb->set_configuration(setupfd, conf[0].id);
if (rv < 0)
return rv;
rv = massstoragereset();
if (rv < 0)
return rv;
maxlun := getmaxlun();
if (maxlun < 0)
return maxlun;
lun = 0;
if(debug)
sys->print("maxlun %d\n", maxlun);
inep = outep = nil;
epts := (hd conf[0].iface[0].altiface).ep;
for(i := 0; i < len epts; i++)
if(epts[i].etype == Usb->Ebulk){
if(epts[i].d2h){
if(inep == nil)
inep = epts[i];
}else{
if(outep == nil)
outep = epts[i];
}
}
if(inep == nil || outep == nil){
sys->print("can't find endpoints\n");
return -1;
}
isrw := (inep.addr & 16rF) == (outep.addr & 16rF);
if(!isrw){
infd = openep(path, inep, Sys->OREAD);
if(infd == nil)
return -1;
outfd = openep(path, outep, Sys->OWRITE);
if(outfd == nil)
return -1;
}else{
infd = outfd = openep(path, inep, Sys->ORDWR);
if(infd == nil)
return -1;
}
if (scsiinquiry(0) < 0)
return -1;
scsistartunit(lun, 1);
if (scsireadcapacity(0) < 0) {
scsirequestsense(0);
if (scsireadcapacity(0) < 0)
return -1;
}
fileio := sys->file2chan("/chan", "usbdisk");
if (fileio == nil) {
sys->print("file2chan failed: %r\n");
return -1;
}
setlength("/chan/usbdisk", capacity);
# warnfprint(ctlfd, "debug 0 1");
# warnfprint(ctlfd, "debug 1 1");
# warnfprint(ctlfd, "debug 2 1");
pidc := chan of int;
spawn reader(pidc, fileio);
readerpid = <- pidc;
return 0;
}
shutdown()
{
if (readerpid >= 0)
kill(readerpid);
}
openep(path: string, ep: ref Endpt, mode: int): ref Sys->FD
{
if(debug)
sys->print("ep %x maxpkt %d interval %d\n", ep.addr, ep.maxpkt, ep.interval);
ms: string;
case mode {
Sys->OREAD => ms = "r";
Sys->OWRITE => ms = "w";
* => ms = "rw";
}
if(sys->fprint(ctlfd, "ep %d bulk %s %d 16", ep.addr&16rF, ms, ep.maxpkt) < 0)
return nil;
return sys->open(sys->sprint("%s/ep%ddata", path, ep.addr&16rF), mode);
}
setlength(f: string, size: big)
{
d := sys->nulldir;
d.length = size;
sys->wstat(f, d); # ignore errors since it fails on older kernels
}