ref: 1d891d163e814a93ee5346cf05b4fac297bf3a5c
dir: /sys/src/cmd/nusb/usbd/hub.c/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include "usb.h"
#include "dat.h"
#include "fns.h"
Hub *hubs;
QLock hublock;
static int nhubs;
static int mustdump;
static int pollms = Pollms;
static Lock masklck;
static char *dsname[] = { "disabled", "attached", "configed" };
int
getdevnb(uvlong *maskp)
{
int i;
lock(&masklck);
for(i = 0; i < 8 * sizeof *maskp; i++)
if((*maskp & (1ULL<<i)) == 0){
*maskp |= 1ULL<<i;
unlock(&masklck);
return i;
}
unlock(&masklck);
return -1;
}
void
putdevnb(uvlong *maskp, int id)
{
lock(&masklck);
if(id >= 0)
*maskp &= ~(1ULL<<id);
unlock(&masklck);
}
static int
hubfeature(Hub *h, int port, int f, int on)
{
int cmd;
if(on)
cmd = Rsetfeature;
else
cmd = Rclearfeature;
return usbcmd(h->dev, Rh2d|Rclass|Rother, cmd, f, port, nil, 0);
}
/*
* This may be used to detect overcurrent on the hub
*/
static void
checkhubstatus(Hub *h)
{
uchar buf[4];
int sts;
if(h->isroot) /* not for root hubs */
return;
if(usbcmd(h->dev, Rd2h|Rclass|Rdev, Rgetstatus, 0, 0, buf, 4) < 0){
dprint(2, "%s: get hub status: %r\n", h->dev->dir);
return;
}
sts = GET2(buf);
dprint(2, "hub %s: status %#ux\n", h->dev->dir, sts);
}
static int
confighub(Hub *h)
{
int type;
uchar buf[128]; /* room for extra descriptors */
int i;
Usbdev *d;
DHub *dd;
Port *pp;
int nr;
int nmap;
uchar *PortPwrCtrlMask;
int offset;
int mask;
d = h->dev->usb;
for(i = 0; i < nelem(d->ddesc); i++)
if(d->ddesc[i] == nil)
break;
else if(d->ddesc[i]->data.bDescriptorType == Dhub){
dd = (DHub*)&d->ddesc[i]->data;
nr = Dhublen;
goto Config;
}
type = Rd2h|Rclass|Rdev;
nr = usbcmd(h->dev, type, Rgetdesc, Dhub<<8|0, 0, buf, sizeof buf);
if(nr < Dhublen){
dprint(2, "%s: %s: getdesc hub: %r\n", argv0, h->dev->dir);
return -1;
}
dd = (DHub*)buf;
Config:
h->nport = dd->bNbrPorts;
nmap = 1 + h->nport/8;
if(nr < 7 + 2*nmap){
fprint(2, "%s: %s: descr. too small\n", argv0, h->dev->dir);
return -1;
}
h->port = emallocz((h->nport+1)*sizeof(Port), 1);
h->pwrms = dd->bPwrOn2PwrGood*2;
if(h->pwrms < Powerdelay)
h->pwrms = Powerdelay;
h->maxcurrent = dd->bHubContrCurrent;
h->pwrmode = dd->wHubCharacteristics[0] & 3;
h->compound = (dd->wHubCharacteristics[0] & (1<<2))!=0;
h->leds = (dd->wHubCharacteristics[0] & (1<<7)) != 0;
PortPwrCtrlMask = dd->DeviceRemovable + nmap;
for(i = 1; i <= h->nport; i++){
pp = &h->port[i];
offset = i/8;
mask = 1<<(i%8);
pp->removable = (dd->DeviceRemovable[offset] & mask) != 0;
pp->pwrctl = (PortPwrCtrlMask[offset] & mask) != 0;
}
return 0;
}
static void
configroothub(Hub *h)
{
Dev *d;
char buf[128];
char *p;
int nr;
d = h->dev;
h->nport = 2;
h->maxpkt = 8;
seek(d->cfd, 0, 0);
nr = read(d->cfd, buf, sizeof(buf)-1);
if(nr < 0)
goto Done;
buf[nr] = 0;
p = strstr(buf, "ports ");
if(p == nil)
fprint(2, "%s: %s: no port information\n", argv0, d->dir);
else
h->nport = atoi(p+6);
p = strstr(buf, "maxpkt ");
if(p == nil)
fprint(2, "%s: %s: no maxpkt information\n", argv0, d->dir);
else
h->maxpkt = atoi(p+7);
Done:
h->port = emallocz((h->nport+1)*sizeof(Port), 1);
dprint(2, "%s: %s: ports %d maxpkt %d\n", argv0, d->dir, h->nport, h->maxpkt);
}
Hub*
newhub(char *fn, Dev *d)
{
Hub *h;
int i;
Usbdev *ud;
h = emallocz(sizeof(Hub), 1);
h->isroot = (d == nil);
if(h->isroot){
h->dev = opendev(fn);
if(h->dev == nil){
fprint(2, "%s: opendev: %s: %r", argv0, fn);
goto Fail;
}
if(opendevdata(h->dev, ORDWR) < 0){
fprint(2, "%s: opendevdata: %s: %r\n", argv0, fn);
goto Fail;
}
configroothub(h); /* never fails */
}else{
h->dev = d;
if(confighub(h) < 0){
fprint(2, "%s: %s: config: %r\n", argv0, fn);
goto Fail;
}
}
if(h->dev == nil){
fprint(2, "%s: opendev: %s: %r\n", argv0, fn);
goto Fail;
}
devctl(h->dev, "hub");
ud = h->dev->usb;
if(h->isroot)
devctl(h->dev, "info roothub csp %#08ux ports %d",
0x000009, h->nport);
else{
devctl(h->dev, "info hub csp %#08ulx ports %d %q %q",
ud->csp, h->nport, ud->vendor, ud->product);
for(i = 1; i <= h->nport; i++)
if(hubfeature(h, i, Fportpower, 1) < 0)
fprint(2, "%s: %s: power: %r\n", argv0, fn);
sleep(h->pwrms);
for(i = 1; i <= h->nport; i++)
if(h->leds != 0)
hubfeature(h, i, Fportindicator, 1);
}
h->next = hubs;
hubs = h;
nhubs++;
dprint(2, "%s: hub %#p allocated:", argv0, h);
dprint(2, " ports %d pwrms %d max curr %d pwrm %d cmp %d leds %d\n",
h->nport, h->pwrms, h->maxcurrent,
h->pwrmode, h->compound, h->leds);
incref(h->dev);
return h;
Fail:
if(d != nil)
devctl(d, "detach");
free(h->port);
free(h);
dprint(2, "%s: hub %#p failed to start:", argv0, h);
return nil;
}
static void portdetach(Hub *h, int p);
/*
* If during enumeration we get an I/O error the hub is gone or
* in pretty bad shape. Because of retries of failed usb commands
* (and the sleeps they include) it can take a while to detach all
* ports for the hub. This detaches all ports and makes the hub void.
* The parent hub will detect a detach (probably right now) and
* close it later.
*/
static void
hubfail(Hub *h)
{
int i;
for(i = 1; i <= h->nport; i++)
portdetach(h, i);
h->failed = 1;
}
static void
closehub(Hub *h)
{
Hub **hl;
dprint(2, "%s: closing hub %#p\n", argv0, h);
for(hl = &hubs; *hl != nil; hl = &(*hl)->next)
if(*hl == h)
break;
if(*hl == nil)
sysfatal("closehub: no hub");
*hl = h->next;
nhubs--;
hubfail(h); /* detach all ports */
free(h->port);
assert(h->dev != nil);
devctl(h->dev, "detach");
closedev(h->dev);
free(h);
}
static int
portstatus(Hub *h, int p)
{
Dev *d;
uchar buf[4];
int t;
int sts;
int dbg;
dbg = usbdebug;
if(dbg != 0 && dbg < 4)
usbdebug = 1; /* do not be too chatty */
d = h->dev;
t = Rd2h|Rclass|Rother;
if(usbcmd(d, t, Rgetstatus, 0, p, buf, sizeof(buf)) < 0)
sts = -1;
else
sts = GET2(buf);
usbdebug = dbg;
return sts;
}
static char*
stsstr(int sts)
{
static char s[80];
char *e;
e = s;
if(sts&PSsuspend)
*e++ = 'z';
if(sts&PSreset)
*e++ = 'r';
if(sts&PSslow)
*e++ = 'l';
if(sts&PShigh)
*e++ = 'h';
if(sts&PSchange)
*e++ = 'c';
if(sts&PSenable)
*e++ = 'e';
if(sts&PSstatuschg)
*e++ = 's';
if(sts&PSpresent)
*e++ = 'p';
if(e == s)
*e++ = '-';
*e = 0;
return s;
}
static int
getmaxpkt(Dev *d, int islow)
{
uchar buf[64]; /* More room to try to get device-specific descriptors */
DDev *dd;
dd = (DDev*)buf;
if(islow)
dd->bMaxPacketSize0 = 8;
else
dd->bMaxPacketSize0 = 64;
if(usbcmd(d, Rd2h|Rstd|Rdev, Rgetdesc, Ddev<<8|0, 0, buf, sizeof(buf)) < 0)
return -1;
return dd->bMaxPacketSize0;
}
/*
* BUG: does not consider max. power avail.
*/
static Dev*
portattach(Hub *h, int p, int sts)
{
Dev *d;
Port *pp;
Dev *nd;
char fname[80];
char buf[40];
char *sp;
int mp;
int nr;
d = h->dev;
pp = &h->port[p];
nd = nil;
pp->state = Pattached;
dprint(2, "%s: %s: port %d attach sts %#ux\n", argv0, d->dir, p, sts);
sleep(Connectdelay);
if(hubfeature(h, p, Fportenable, 1) < 0)
dprint(2, "%s: %s: port %d: enable: %r\n", argv0, d->dir, p);
sleep(Enabledelay);
if(hubfeature(h, p, Fportreset, 1) < 0){
dprint(2, "%s: %s: port %d: reset: %r\n", argv0, d->dir, p);
goto Fail;
}
sleep(Resetdelay);
sts = portstatus(h, p);
if(sts < 0)
goto Fail;
if((sts & PSenable) == 0){
dprint(2, "%s: %s: port %d: not enabled?\n", argv0, d->dir, p);
hubfeature(h, p, Fportenable, 1);
sts = portstatus(h, p);
if((sts & PSenable) == 0)
goto Fail;
}
sp = "full";
if(sts & PSslow)
sp = "low";
if(sts & PShigh)
sp = "high";
dprint(2, "%s: %s: port %d: attached status %#ux\n", argv0, d->dir, p, sts);
if(devctl(d, "newdev %s %d", sp, p) < 0){
fprint(2, "%s: %s: port %d: newdev: %r\n", argv0, d->dir, p);
goto Fail;
}
seek(d->cfd, 0, 0);
nr = read(d->cfd, buf, sizeof(buf)-1);
if(nr == 0){
fprint(2, "%s: %s: port %d: newdev: eof\n", argv0, d->dir, p);
goto Fail;
}
if(nr < 0){
fprint(2, "%s: %s: port %d: newdev: %r\n", argv0, d->dir, p);
goto Fail;
}
buf[nr] = 0;
snprint(fname, sizeof(fname), "/dev/usb/%s", buf);
nd = opendev(fname);
if(nd == nil){
fprint(2, "%s: %s: port %d: opendev: %r\n", argv0, d->dir, p);
goto Fail;
}
if(usbdebug > 2)
devctl(nd, "debug 1");
if(opendevdata(nd, ORDWR) < 0){
fprint(2, "%s: %s: opendevdata: %r\n", argv0, nd->dir);
goto Fail;
}
if(usbcmd(nd, Rh2d|Rstd|Rdev, Rsetaddress, nd->id, 0, nil, 0) < 0){
dprint(2, "%s: %s: port %d: setaddress: %r\n", argv0, d->dir, p);
goto Fail;
}
if(devctl(nd, "address") < 0){
dprint(2, "%s: %s: port %d: set address: %r\n", argv0, d->dir, p);
goto Fail;
}
mp=getmaxpkt(nd, strcmp(sp, "low") == 0);
if(mp < 0){
dprint(2, "%s: %s: port %d: getmaxpkt: %r\n", argv0, d->dir, p);
goto Fail;
}else{
dprint(2, "%s; %s: port %d: maxpkt %d\n", argv0, d->dir, p, mp);
devctl(nd, "maxpkt %d", mp);
}
if((sts & PSslow) != 0 && strcmp(sp, "full") == 0)
dprint(2, "%s: %s: port %d: %s is full speed when port is low\n",
argv0, d->dir, p, nd->dir);
if(configdev(nd) < 0){
dprint(2, "%s: %s: port %d: configdev: %r\n", argv0, d->dir, p);
goto Fail;
}
/*
* We always set conf #1. BUG.
*/
if(usbcmd(nd, Rh2d|Rstd|Rdev, Rsetconf, 1, 0, nil, 0) < 0){
dprint(2, "%s: %s: port %d: setconf: %r\n", argv0, d->dir, p);
unstall(nd, nd, Eout);
if(usbcmd(nd, Rh2d|Rstd|Rdev, Rsetconf, 1, 0, nil, 0) < 0)
goto Fail;
}
pp->state = Pconfiged;
dprint(2, "%s: %s: port %d: configured: %s\n", argv0, d->dir, p, nd->dir);
return pp->dev = nd;
Fail:
pp->state = Pdisabled;
pp->sts = 0;
if(pp->hub != nil)
pp->hub = nil; /* hub closed by enumhub */
hubfeature(h, p, Fportenable, 0);
if(nd != nil)
devctl(nd, "detach");
closedev(nd);
return nil;
}
static void
portdetach(Hub *h, int p)
{
Dev *d;
Port *pp;
d = h->dev;
pp = &h->port[p];
/*
* Clear present, so that we detect an attach on reconnects.
*/
pp->sts &= ~(PSpresent|PSenable);
if(pp->state == Pdisabled)
return;
pp->state = Pdisabled;
dprint(2, "%s: %s: port %d: detached\n", argv0, d->dir, p);
if(pp->hub != nil){
closehub(pp->hub);
pp->hub = nil;
}
if(pp->devmaskp != nil)
putdevnb(pp->devmaskp, pp->devnb);
pp->devmaskp = nil;
if(pp->dev != nil){
detachdev(pp);
devctl(pp->dev, "detach");
closedev(pp->dev);
pp->dev = nil;
}
}
/*
* The next two functions are included to
* perform a port reset asked for by someone (usually a driver).
* This must be done while no other device is in using the
* configuration address and with care to keep the old address.
* To keep drivers decoupled from usbd they write the reset request
* to the #u/usb/epN.0/ctl file and then exit.
* This is unfortunate because usbd must now poll twice as much.
*
* An alternative to this reset process would be for the driver to detach
* the device. The next function could see that, issue a port reset, and
* then restart the driver once to see if it's a temporary error.
*
* The real fix would be to use interrupt endpoints for non-root hubs
* (would probably make some hubs fail) and add an events file to
* the kernel to report events to usbd. This is a severe change not
* yet implemented.
*/
static int
portresetwanted(Hub *h, int p)
{
char buf[5];
Port *pp;
Dev *nd;
pp = &h->port[p];
nd = pp->dev;
if(nd != nil && nd->cfd >= 0 && pread(nd->cfd, buf, 5, 0LL) == 5)
return strncmp(buf, "reset", 5) == 0;
else
return 0;
}
static void
portreset(Hub *h, int p)
{
int sts;
Dev *d, *nd;
Port *pp;
d = h->dev;
pp = &h->port[p];
nd = pp->dev;
dprint(2, "%s: %s: port %d: resetting\n", argv0, d->dir, p);
if(hubfeature(h, p, Fportreset, 1) < 0){
dprint(2, "%s: %s: port %d: reset: %r\n", argv0, d->dir, p);
goto Fail;
}
sleep(Resetdelay);
sts = portstatus(h, p);
if(sts < 0)
goto Fail;
if((sts & PSenable) == 0){
dprint(2, "%s: %s: port %d: not enabled?\n", argv0, d->dir, p);
hubfeature(h, p, Fportenable, 1);
sts = portstatus(h, p);
if((sts & PSenable) == 0)
goto Fail;
}
nd = pp->dev;
opendevdata(nd, ORDWR);
if(usbcmd(nd, Rh2d|Rstd|Rdev, Rsetaddress, nd->id, 0, nil, 0) < 0){
dprint(2, "%s: %s: port %d: setaddress: %r\n", argv0, d->dir, p);
goto Fail;
}
if(devctl(nd, "address") < 0){
dprint(2, "%s: %s: port %d: set address: %r\n", argv0, d->dir, p);
goto Fail;
}
if(usbcmd(nd, Rh2d|Rstd|Rdev, Rsetconf, 1, 0, nil, 0) < 0){
dprint(2, "%s: %s: port %d: setconf: %r\n", argv0, d->dir, p);
unstall(nd, nd, Eout);
if(usbcmd(nd, Rh2d|Rstd|Rdev, Rsetconf, 1, 0, nil, 0) < 0)
goto Fail;
}
if(nd->dfd >= 0){
close(nd->dfd);
nd->dfd = -1;
}
return;
Fail:
pp->state = Pdisabled;
pp->sts = 0;
if(pp->hub != nil)
pp->hub = nil; /* hub closed by enumhub */
hubfeature(h, p, Fportenable, 0);
if(nd != nil)
devctl(nd, "detach");
closedev(nd);
}
static int
portgone(Port *pp, int sts)
{
if(sts < 0)
return 1;
/*
* If it was enabled and it's not now then it may be reconnect.
* We pretend it's gone and later we'll see it as attached.
*/
if((pp->sts & PSenable) != 0 && (sts & PSenable) == 0)
return 1;
return (pp->sts & PSpresent) != 0 && (sts & PSpresent) == 0;
}
static int
enumhub(Hub *h, int p)
{
int sts;
Dev *d;
Port *pp;
int onhubs;
if(h->failed)
return 0;
d = h->dev;
if(usbdebug > 3)
fprint(2, "%s: %s: port %d enumhub\n", argv0, d->dir, p);
sts = portstatus(h, p);
if(sts < 0){
hubfail(h); /* avoid delays on detachment */
return -1;
}
pp = &h->port[p];
onhubs = nhubs;
if((sts & PSsuspend) != 0){
if(hubfeature(h, p, Fportenable, 1) < 0)
dprint(2, "%s: %s: port %d: enable: %r\n", argv0, d->dir, p);
sleep(Enabledelay);
sts = portstatus(h, p);
fprint(2, "%s: %s: port %d: resumed (sts %#ux)\n", argv0, d->dir, p, sts);
}
if((pp->sts & PSpresent) == 0 && (sts & PSpresent) != 0){
if(portattach(h, p, sts) != nil)
if(attachdev(pp) < 0)
portdetach(h, p);
}else if(portgone(pp, sts)){
portdetach(h, p);
}else if(portresetwanted(h, p))
portreset(h, p);
else if(pp->sts != sts){
dprint(2, "%s: %s port %d: sts %s %#x ->",
argv0, d->dir, p, stsstr(pp->sts), pp->sts);
dprint(2, " %s %#x\n",stsstr(sts), sts);
}
pp->sts = sts;
if(onhubs != nhubs)
return -1;
return 0;
}
static void
dump(void)
{
Hub *h;
int i;
mustdump = 0;
for(h = hubs; h != nil; h = h->next)
for(i = 1; i <= h->nport; i++)
fprint(2, "%s: hub %#p %s port %d: %U",
argv0, h, h->dev->dir, i, h->port[i].dev);
}
void
work(void)
{
char *fn;
Hub *h;
int i;
hubs = nil;
while((fn = rendezvous(work, nil)) != nil){
dprint(2, "%s: %s starting\n", argv0, fn);
h = newhub(fn, nil);
if(h == nil)
fprint(2, "%s: %s: newhub failed: %r\n", argv0, fn);
free(fn);
}
if(hubs == nil)
return;
/*
* Enumerate (and acknowledge after first enumeration).
* Do NOT perform enumeration concurrently for the same
* controller. new devices attached respond to a default
* address (0) after reset, thus enumeration has to work
* one device at a time at least before addresses have been
* assigned.
* Do not use hub interrupt endpoint because we
* have to poll the root hub(s) in any case.
*/
for(;;){
qlock(&hublock);
Again:
for(h = hubs; h != nil; h = h->next)
for(i = 1; i <= h->nport; i++)
if(enumhub(h, i) < 0){
/* changes in hub list; repeat */
goto Again;
}
qunlock(&hublock);
checkidle();
sleep(pollms);
if(mustdump)
dump();
}
}