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Handle DCD differently so it's not always asserted. From kern/30268 from 

Wolfgang Stukenbrock.
This commit is contained in:
augustss 2005-05-18 11:26:11 +00:00
parent ea66ccc0a5
commit 191e9dab58
1 changed files with 5 additions and 4 deletions
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9
sys/dev/usb/ucom.c
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@ -1,4 +1,4 @@
/* $NetBSD: ucom.c,v 1.53 2004/09/13 12:55:49 drochner Exp $ */
/* $NetBSD: ucom.c,v 1.54 2005/05/18 11:26:11 augustss Exp $ */
/*
* Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
@ -41,7 +41,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ucom.c,v 1.53 2004/09/13 12:55:49 drochner Exp $");
__KERNEL_RCSID(0, "$NetBSD: ucom.c,v 1.54 2005/05/18 11:26:11 augustss Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -793,7 +793,8 @@ ucom_status_change(struct ucom_softc *sc)
ISSET(sc->sc_msr, UMSR_DCD));
} else {
sc->sc_lsr = 0;
sc->sc_msr = 0;
/* Assume DCD is present, if we have no chance to check it. */
sc->sc_msr = UMSR_DCD;
}
}
@ -850,7 +851,7 @@ ucomparam(struct tty *tp, struct termios *t)
* explicit request.
*/
DPRINTF(("ucomparam: l_modem\n"));
(void) (*tp->t_linesw->l_modem)(tp, 1 /* XXX carrier */ );
(void) (*tp->t_linesw->l_modem)(tp, ISSET(sc->sc_msr, UMSR_DCD));
#if 0
XXX what if the hardware is not open