ref: 52cacba37c6f3a125ef931afa4b9c2cdb7438fef
dir: /sys/src/cmd/nusb/serial/serial.c/
/*
* This part takes care of locking except for initialization and
* other threads created by the hw dep. drivers.
*/
#include <u.h>
#include <libc.h>
#include <ctype.h>
#include <thread.h>
#include <fcall.h>
#include <9p.h>
#include "usb.h"
#include "serial.h"
int serialdebug;
Serialport **ports;
int nports;
static void
serialfatal(Serial *ser)
{
Serialport *p;
int i;
dsprint(2, "serial: fatal error, detaching\n");
devctl(ser->dev, "detach");
for(i = 0; i < ser->nifcs; i++){
p = &ser->p[i];
if(p->w4data != nil)
chanclose(p->w4data);
if(p->gotdata != nil)
chanclose(p->gotdata);
}
}
/* I sleep with the lock... only way to drain in general */
static void
serialdrain(Serialport *p)
{
Serial *ser;
uint baud, pipesize;
ser = p->s;
baud = p->baud;
if(p->baud == ~0)
return;
if(ser->maxwtrans < 256)
pipesize = 256;
else
pipesize = ser->maxwtrans;
/* wait for the at least 256-byte pipe to clear */
sleep(10 + pipesize/((1 + baud)*1000));
if(ser->clearpipes != nil)
ser->clearpipes(p);
}
int
serialreset(Serial *ser)
{
Serialport *p;
int i, res;
res = 0;
/* cmd for reset */
for(i = 0; i < ser->nifcs; i++){
p = &ser->p[i];
serialdrain(p);
}
if(ser->reset != nil)
res = ser->reset(ser, nil);
return res;
}
/* call this if something goes wrong, must be qlocked */
int
serialrecover(Serial *ser, Serialport *p, Dev *ep, char *err)
{
if(p != nil)
dprint(2, "serial[%d], %s: %s, level %d\n", p->interfc,
p->name, err, ser->recover);
else
dprint(2, "serial[%s], global error, level %d\n",
ser->p[0].name, ser->recover);
ser->recover++;
if(strstr(err, "detached") != nil)
return -1;
if(ser->recover < 3){
if(p != nil){
if(ep != nil){
if(ep == p->epintr)
unstall(ser->dev, p->epintr, Ein);
if(ep == p->epin)
unstall(ser->dev, p->epin, Ein);
if(ep == p->epout)
unstall(ser->dev, p->epout, Eout);
return 0;
}
if(p->epintr != nil)
unstall(ser->dev, p->epintr, Ein);
if(p->epin != nil)
unstall(ser->dev, p->epin, Ein);
if(p->epout != nil)
unstall(ser->dev, p->epout, Eout);
}
return 0;
}
if(ser->recover > 4 && ser->recover < 8)
serialfatal(ser);
if(ser->recover > 8){
ser->reset(ser, p);
return 0;
}
if(serialreset(ser) < 0)
return -1;
return 0;
}
static int
serialctl(Serialport *p, char *cmd)
{
Serial *ser;
int c, i, n, nf, nop, nw, par, drain, set, lines;
char *f[16];
uchar x;
ser = p->s;
drain = set = lines = 0;
nf = tokenize(cmd, f, nelem(f));
for(i = 0; i < nf; i++){
if(strncmp(f[i], "break", 5) == 0){
if(ser->setbreak != nil)
ser->setbreak(p, 1);
continue;
}
nop = 0;
n = atoi(f[i]+1);
c = *f[i];
if (isascii(c) && isupper(c))
c = tolower(c);
switch(c){
case 'b':
drain++;
p->baud = n;
set++;
break;
case 'c':
p->dcd = n;
// lines++;
++nop;
break;
case 'd':
p->dtr = n;
lines++;
break;
case 'e':
p->dsr = n;
// lines++;
++nop;
break;
case 'f': /* flush the pipes */
drain++;
break;
case 'h': /* hangup?? */
p->rts = p->dtr = 0;
lines++;
fprint(2, "serial: %c, unsure ctl\n", c);
break;
case 'i':
++nop;
break;
case 'k':
drain++;
ser->setbreak(p, 1);
sleep(n);
ser->setbreak(p, 0);
break;
case 'l':
drain++;
p->bits = n;
set++;
break;
case 'm':
drain++;
if(ser->modemctl != nil)
ser->modemctl(p, n);
if(n == 0)
p->cts = 0;
break;
case 'n':
p->blocked = n;
++nop;
break;
case 'p': /* extended... */
if(strlen(f[i]) != 2)
return -1;
drain++;
par = f[i][1];
if(par == 'n')
p->parity = 0;
else if(par == 'o')
p->parity = 1;
else if(par == 'e')
p->parity = 2;
else if(par == 'm') /* mark parity */
p->parity = 3;
else if(par == 's') /* space parity */
p->parity = 4;
else
return -1;
set++;
break;
case 'q':
// drain++;
p->limit = n;
++nop;
break;
case 'r':
drain++;
p->rts = n;
lines++;
break;
case 's':
drain++;
p->stop = n;
set++;
break;
case 'w':
/* ?? how do I put this */
p->timer = n * 100000LL;
++nop;
break;
case 'x':
if(n == 0)
x = CTLS;
else
x = CTLQ;
if(ser->wait4write != nil)
nw = ser->wait4write(p, &x, 1);
else
nw = write(p->epout->dfd, &x, 1);
if(nw != 1){
serialrecover(ser, p, p->epout, "");
return -1;
}
break;
}
/*
* don't print. the condition is harmless and the print
* splatters all over the display.
*/
USED(nop);
if (0 && nop)
fprint(2, "serial: %c, unsupported nop ctl\n", c);
}
if(drain)
serialdrain(p);
if(lines && !set){
if(ser->sendlines != nil && ser->sendlines(p) < 0)
return -1;
} else if(set){
if(ser->setparam != nil && ser->setparam(p) < 0)
return -1;
}
ser->recover = 0;
return 0;
}
char *pformat = "noems";
char *
serdumpst(Serialport *p, char *buf, int bufsz)
{
char *e, *s;
Serial *ser;
ser = p->s;
e = buf + bufsz;
s = seprint(buf, e, "b%d ", p->baud);
s = seprint(s, e, "c%d ", p->dcd); /* unimplemented */
s = seprint(s, e, "d%d ", p->dtr);
s = seprint(s, e, "e%d ", p->dsr); /* unimplemented */
s = seprint(s, e, "l%d ", p->bits);
s = seprint(s, e, "m%d ", p->mctl);
if(p->parity >= 0 || p->parity < strlen(pformat))
s = seprint(s, e, "p%c ", pformat[p->parity]);
else
s = seprint(s, e, "p%c ", '?');
s = seprint(s, e, "r%d ", p->rts);
s = seprint(s, e, "s%d ", p->stop);
s = seprint(s, e, "i%d ", p->fifo);
s = seprint(s, e, "\ndev(%d) ", 0);
s = seprint(s, e, "type(%d) ", ser->type);
s = seprint(s, e, "framing(%d) ", p->nframeerr);
s = seprint(s, e, "overruns(%d) ", p->novererr);
s = seprint(s, e, "berr(%d) ", p->nbreakerr);
s = seprint(s, e, " serr(%d)\n", p->nparityerr);
return s;
}
Cinfo*
matchid(Cinfo *tab, int vid, int did)
{
while(tab->vid != 0){
if(tab->vid == vid && (tab->did == did || did == 0))
return tab;
tab++;
}
return nil;
}
static int
serinit(Serialport *p)
{
int res;
res = 0;
Serial *ser;
ser = p->s;
if(ser->init != nil)
res = ser->init(p);
if(ser->getparam != nil)
ser->getparam(p);
p->nframeerr = p->nparityerr = p->nbreakerr = p->novererr = 0;
return res;
}
static void
dattach(Req *req)
{
req->fid->qid = (Qid) {0, 0, QTDIR};
req->ofcall.qid = req->fid->qid;
respond(req, nil);
}
static int
dirgen(int n, Dir *d, void *)
{
if(n >= nports * 2)
return -1;
d->qid.path = n + 1;
d->qid.vers = 0;
if(n >= 0)
d->qid.type = 0;
else
d->qid.type = QTDIR;
d->uid = strdup("usb");
d->gid = strdup(d->uid);
d->muid = strdup(d->uid);
if(n >= 0){
d->name = smprint((n & 1) ? "%sctl" : "%s", ports[n/2]->name);
d->mode = ((n & 1) ? 0664 : 0660);
}else{
d->name = strdup("");
d->mode = 0555 | QTDIR;
}
d->atime = d->mtime = time(0);
d->length = 0;
return 0;
}
static char *
dwalk(Fid *fid, char *name, Qid *qidp)
{
int i;
int len;
Qid qid;
char *p;
qid = fid->qid;
if((qid.type & QTDIR) == 0){
return "walk in non-directory";
}
if(strcmp(name, "..") == 0){
fid->qid.path = 0;
fid->qid.vers = 0;
fid->qid.type = QTDIR;
*qidp = fid->qid;
return nil;
}
for(i = 0; i < nports; i++)
if(strncmp(name, ports[i]->name, len = strlen(ports[i]->name)) == 0){
p = name + len;
if(*p == 0)
fid->qid.path = 2 * i + 1;
else if(strcmp(p, "ctl") == 0)
fid->qid.path = 2 * i + 2;
else
continue;
fid->qid.vers = 0;
fid->qid.type = 0;
*qidp = fid->qid;
return nil;
}
return "does not exist";
}
static void
dstat(Req *req)
{
if(dirgen(req->fid->qid.path - 1, &req->d, nil) < 0)
respond(req, "the front fell off");
else
respond(req, nil);
}
static void
procread(Req *req)
{
int count, rcount;
void *data;
Serial *ser;
Serialport *p;
char err[ERRMAX];
int dfd;
p = req->aux;
ser = p->s;
data = req->ofcall.data;
count = req->ifcall.count;
Again:
qlock(ser);
if(count > ser->maxread)
count = ser->maxread;
if(ser->wait4data != nil) {
rcount = ser->wait4data(p, data, count);
qunlock(ser);
} else {
dfd = p->epin->dfd;
qunlock(ser);
rcount = read(dfd, data, count);
}
if(rcount < 0) {
err[0] = 0;
errstr(err, sizeof err);
if(p->rq->flush == 0 && strstr(err, "timed out") != nil)
goto Again;
respond(req, err);
} else {
req->ofcall.count = rcount;
respond(req, nil);
}
}
static void
procwrite(Req *req)
{
int count, wcount;
void *data;
Serial *ser;
Serialport *p;
char err[ERRMAX];
int dfd;
p = req->aux;
ser = p->s;
data = req->ifcall.data;
count = req->ifcall.count;
qlock(ser);
if(ser->wait4data != nil) {
wcount = ser->wait4write(p, data, count);
qunlock(ser);
} else {
dfd = p->epout->dfd;
qunlock(ser);
wcount = write(dfd, data, count);
}
if(wcount != count) {
err[0] = 0;
errstr(err, sizeof err);
respond(req, err);
qlock(ser);
serialrecover(p->s, p, p->epout, err);
qunlock(ser);
} else {
req->ofcall.count = wcount;
respond(req, nil);
}
}
static void
dread(Req *req)
{
Serial *ser;
Serialport *p;
ulong path;
path = req->fid->qid.path;
if(path == 0){
dirread9p(req, dirgen, nil);
respond(req, nil);
return;
}
p = ports[(path - 1) / 2];
ser = p->s;
qlock(ser);
switch((path - 1) % 2){
case 0:
req->aux = p;
reqqueuepush(p->rq, req, procread);
break;
case 1:
req->ofcall.count = 0;
if(req->ifcall.offset == 0 && !p->isjtag){
char buf[256];
serdumpst(p, buf, sizeof buf);
readstr(req, buf);
}
respond(req, nil);
break;
}
qunlock(ser);
}
static void
dwrite(Req *req)
{
Serial *ser;
Serialport *p;
ulong path;
int count;
path = req->fid->qid.path;
p = ports[(path-1) / 2];
ser = p->s;
qlock(ser);
switch((path-1) % 2){
case 0:
req->aux = p;
reqqueuepush(p->wq, req, procwrite);
break;
case 1:
count = req->ifcall.count;
if(!p->isjtag){
char *cmd, *buf;
buf = (char*)req->ifcall.data;
cmd = emallocz(count+1, 1);
memmove(cmd, buf, count);
cmd[count] = 0;
if(serialctl(p, cmd) < 0){
qunlock(ser);
free(cmd);
respond(req, "bad control request");
return;
}
free(cmd);
}
req->ofcall.count = count;
respond(req, nil);
break;
}
qunlock(ser);
}
static int
openeps(Serialport *p, int epin, int epout, int epintr)
{
Serial *ser;
ser = p->s;
p->epin = openep(ser->dev, epin);
if(p->epin == nil){
fprint(2, "serial: openep %d: %r\n", epin);
return -1;
}
if(epin == epout){
incref(p->epin);
p->epout = p->epin;
} else
p->epout = openep(ser->dev, epout);
if(p->epout == nil){
fprint(2, "serial: openep %d: %r\n", epout);
closedev(p->epin);
return -1;
}
if(ser->hasepintr){
p->epintr = openep(ser->dev, epintr);
if(p->epintr == nil){
fprint(2, "serial: openep %d: %r\n", epintr);
closedev(p->epin);
closedev(p->epout);
return -1;
}
opendevdata(p->epintr, OREAD);
devctl(p->epintr, "timeout 1000");
}
if(ser->seteps != nil)
ser->seteps(p);
if(p->epin == p->epout)
opendevdata(p->epin, ORDWR);
else {
opendevdata(p->epin, OREAD);
opendevdata(p->epout, OWRITE);
}
if(p->epin->dfd < 0 || p->epout->dfd < 0 ||
(ser->hasepintr && p->epintr->dfd < 0)){
fprint(2, "serial: open i/o ep data: %r\n");
closedev(p->epin);
closedev(p->epout);
if(ser->hasepintr)
closedev(p->epintr);
return -1;
}
return 0;
}
static int
findendpoints(Serial *ser, int ifc)
{
int i, epin, epout, epintr;
Ep *ep, **eps;
epintr = epin = epout = -1;
/*
* interfc 0 means start from the start which is equiv to
* iterate through endpoints probably, could be done better
*/
eps = ser->dev->usb->conf[0]->iface[ifc]->ep;
for(i = 0; i < Nep; i++){
if((ep = eps[i]) == nil)
continue;
if(ser->hasepintr && ep->type == Eintr &&
ep->dir == Ein && epintr == -1)
epintr = ep->id;
if(ep->type == Ebulk){
if((ep->dir == Ein || ep->dir == Eboth) && epin == -1)
epin = ep->id;
if((ep->dir == Eout || ep->dir == Eboth) && epout == -1)
epout = ep->id;
}
}
dprint(2, "serial[%d]: ep ids: in %d out %d intr %d\n", ifc, epin, epout, epintr);
if(epin == -1 || epout == -1 || (ser->hasepintr && epintr == -1))
return -1;
if(openeps(&ser->p[ifc], epin, epout, epintr) < 0)
return -1;
dprint(2, "serial: ep in %s out %s\n", ser->p[ifc].epin->dir, ser->p[ifc].epout->dir);
if(ser->hasepintr)
dprint(2, "serial: ep intr %s\n", ser->p[ifc].epintr->dir);
if(usbdebug > 1 || serialdebug > 2){
devctl(ser->p[ifc].epin, "debug 1");
devctl(ser->p[ifc].epout, "debug 1");
if(ser->hasepintr)
devctl(ser->p[ifc].epintr, "debug 1");
devctl(ser->dev, "debug 1");
}
return 0;
}
static void
dflush(Req *req)
{
Serialport *p;
Req *old;
ulong path;
old = req->oldreq;
path = old->fid->qid.path;
if(path != 0){
p = ports[(path - 1) / 2];
if(p != nil){
if(old->ifcall.type == Twrite)
reqqueueflush(p->wq, old);
else
reqqueueflush(p->rq, old);
}
}
respond(req, nil);
}
/* keep in sync with main.c */
static void
usage(void)
{
fprint(2, "usage: %s [-d] devid\n", argv0);
threadexitsall("usage");
}
static void
dend(Srv*)
{
threadexitsall(nil);
}
static Srv serialfs = {
.attach = dattach,
.walk1 = dwalk,
.read = dread,
.write= dwrite,
.stat = dstat,
.flush = dflush,
.end = dend,
};
extern int ftprobe(Serial *ser);
extern int plprobe(Serial *ser);
extern int slprobe(Serial *ser);
extern int uconsprobe(Serial *ser);
void
threadmain(int argc, char* argv[])
{
Serial *ser;
Dev *dev;
char buf[50];
Serialport *p;
int i;
ARGBEGIN{
case 'd':
usbdebug++;
serialdebug++;
break;
default:
usage();
}ARGEND
if(argc != 1)
usage();
dev = getdev(*argv);
if(dev == nil)
sysfatal("getdev: %r");
ser = dev->aux = emallocz(sizeof(Serial), 1);
ser->maxrtrans = ser->maxwtrans = sizeof ser->p[0].data;
ser->maxread = ser->maxwrite = sizeof ser->p[0].data;
ser->dev = dev;
ser->jtag = -1;
ser->nifcs = 1;
/* probe all the drivers */
if(uconsprobe(ser)
&& ftprobe(ser)
&& slprobe(ser)
&& plprobe(ser))
sysfatal("no serial devices found");
for(i = 0; i < ser->nifcs; i++){
p = &ser->p[i];
p->baud = ~0;
p->interfc = i;
p->s = ser;
if(i == ser->jtag)
p->isjtag++;
if(findendpoints(ser, i) < 0)
sysfatal("no endpoints found for ifc %d", i);
p->w4data = chancreate(sizeof(ulong), 0);
p->gotdata = chancreate(sizeof(ulong), 0);
}
qlock(ser);
serialreset(ser);
for(i = 0; i < ser->nifcs; i++){
p = &ser->p[i];
if(serinit(p) < 0)
sysfatal("wserinit: %r");
if(ser->nifcs == 1)
snprint(p->name, sizeof p->name, "%s%s", p->isjtag ? "jtag" : "eiaU", dev->hname);
else
snprint(p->name, sizeof p->name, "%s%s.%d", p->isjtag ? "jtag" : "eiaU", dev->hname, i);
p->rq = reqqueuecreate();
p->wq = reqqueuecreate();
ports = realloc(ports, (nports + 1) * sizeof(Serialport*));
ports[nports++] = p;
}
qunlock(ser);
snprint(buf, sizeof buf, "%d.serial", dev->id);
threadpostsharesrv(&serialfs, nil, "usb", buf);
threadexits(nil);
}