static usbd_status
udsir_start_read(struct udsir_softc *sc)
{
usbd_status err;
DPRINTFN(60, ("%s: sc=%p, size=%d\n", __func__, sc, sc->sc_rd_maxpsz));
if (sc->sc_dying)
return USBD_IOERROR;
if (UDSIR_BLOCK_RX_DATA(sc) || deframe_rd_ur(sc)) {
/*
* Can't start reading just yet. Since we aren't
* going to start a read, have to switch direction to
* idle.
*/
sc->sc_direction = udir_idle;
return USBD_NORMAL_COMPLETION;
}
/* Starting a read... */
sc->sc_rd_readinprogress = 1;
sc->sc_direction = udir_input;
if (sc->sc_rd_err) {
sc->sc_rd_err = 0;
DPRINTFN(0, ("%s: clear stall\n", __func__));
usbd_clear_endpoint_stall(sc->sc_rd_pipe);
}
usbd_setup_xfer(sc->sc_rd_xfer, sc->sc_rd_pipe, sc, sc->sc_rd_buf,
sc->sc_rd_maxpsz, USBD_SHORT_XFER_OK | USBD_NO_COPY,
USBD_NO_TIMEOUT, udsir_rd_cb);
err = usbd_transfer(sc->sc_rd_xfer);
if (err != USBD_IN_PROGRESS) {
DPRINTFN(0, ("%s: err=%d\n", __func__, (int)err));
return err;
}
return USBD_NORMAL_COMPLETION;
}
static void
udsir_rd_cb(struct usbd_xfer *xfer, void * priv, usbd_status status)
{
struct udsir_softc *sc = priv;
uint32_t size;
DPRINTFN(60, ("%s: sc=%p\n", __func__, sc));
/* Read is no longer in progress */
sc->sc_rd_readinprogress = 0;
if (status == USBD_CANCELLED || sc->sc_closing) /* this is normal */
return;
if (status) {
size = 0;
sc->sc_rd_err = 1;
if (sc->sc_direction == udir_input ||
sc->sc_direction == udir_idle) {
/*
* Receive error, probably need to clear error
* condition.
*/
sc->sc_direction = udir_stalled;
}
} else
usbd_get_xfer_status(xfer, NULL, NULL, &size, NULL);
sc->sc_rd_index = 0;
sc->sc_rd_count = size;
DPRINTFN(((size > 0 || sc->sc_rd_err != 0) ? 20 : 60),
("%s: sc=%p size=%u, err=%d\n",
__func__, sc, size, sc->sc_rd_err));
#ifdef UDSIR_DEBUG
if (udsirdebug >= 20 && size > 0)
udsir_dumpdata(sc->sc_rd_buf, size, __func__);
#endif
if (deframe_rd_ur(sc) == 0) {
if (!deframe_isclear(&sc->sc_framestate) && size == 0 &&
sc->sc_rd_expectdataticks == 0) {
/*
* Expected data, but didn't get it
* within expected time...
*/
DPRINTFN(5,("%s: incoming packet timeout\n",
__func__));
deframe_clear(&sc->sc_framestate);
} else if (size > 0) {
/*
* If we also received actual data, reset the
* data read timeout and wake up the possibly
* sleeping thread...
*/
sc->sc_rd_expectdataticks = 2;
wakeup(&sc->sc_thread);
}
}
/*
* Check if incoming data has stopped, or that we cannot
* safely read any more data. In the case of the latter we
* must switch to idle so that a write will not block...
*/
if (sc->sc_direction == udir_input &&
((size == 0 && sc->sc_rd_expectdataticks == 0) ||
UDSIR_BLOCK_RX_DATA(sc))) {
DPRINTFN(8, ("%s: idling on packet timeout, "
"complete frame, or no data\n", __func__));
sc->sc_direction = udir_idle;
/* Wake up for possible output */
wakeup(&sc->sc_wr_buf);
selnotify(&sc->sc_wr_sel, 0, 0);
}
}
/* ARGSUSED */
static int
udsir_read(void *h, struct uio *uio, int flag)
{
struct udsir_softc *sc = h;
int s;
int error;
u_int uframelen;
DPRINTFN(1, ("%s: sc=%p\n", __func__, sc));
if (sc->sc_dying)
return EIO;
#ifdef DIAGNOSTIC
if (sc->sc_rd_buf == NULL)
return EINVAL;
#endif
sc->sc_refcnt++;
if (!sc->sc_rd_readinprogress && !UDSIR_BLOCK_RX_DATA(sc))
/* Possibly wake up polling thread */
wakeup(&sc->sc_thread);
do {
s = splusb();
while (sc->sc_ur_framelen == 0) {
DPRINTFN(5, ("%s: calling tsleep()\n", __func__));
error = tsleep(&sc->sc_ur_framelen, PZERO | PCATCH,
"usirrd", 0);
if (sc->sc_dying)
error = EIO;
if (error) {
splx(s);
DPRINTFN(0, ("%s: tsleep() = %d\n",
__func__, error));
goto ret;
}
}
splx(s);
uframelen = sc->sc_ur_framelen;
DPRINTFN(1, ("%s: sc=%p framelen=%u, hdr=0x%02x\n",
__func__, sc, uframelen, sc->sc_ur_buf[0]));
if (uframelen > uio->uio_resid)
error = EINVAL;
else
error = uiomove(sc->sc_ur_buf, uframelen, uio);
sc->sc_ur_framelen = 0;
if (deframe_rd_ur(sc) == 0 && uframelen > 0) {
/*
* Need to wait for another read to obtain a
* complete frame... If we also obtained
* actual data, wake up the possibly sleeping
* thread immediately...
*/
wakeup(&sc->sc_thread);
}
} while (uframelen == 0);
DPRINTFN(1, ("%s: return %d\n", __func__, error));
ret:
if (--sc->sc_refcnt < 0)
usb_detach_wakeupold(sc->sc_dev);
return error;
}
