From 9c74364e5bb90240a2984bf84a7c2d0331042da1 Mon Sep 17 00:00:00 2001
From: perry <perry@NetBSD.org>
Date: Sun, 25 Jun 2006 00:39:21 +0000
Subject: [PATCH] Add a power hook for the com device.

---
 sys/dev/ic/com.c    | 36 ++++++++++++++++++++++++++++++++++--
 sys/dev/ic/comvar.h |  3 ++-
 2 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/sys/dev/ic/com.c b/sys/dev/ic/com.c
index e81dc9912eba..4e03571e1d2f 100644
--- a/sys/dev/ic/com.c
+++ b/sys/dev/ic/com.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: com.c,v 1.244 2006/06/07 22:33:34 kardel Exp $	*/
+/*	$NetBSD: com.c,v 1.245 2006/06/25 00:39:21 perry Exp $	*/
 
 /*-
  * Copyright (c) 1998, 1999, 2004 The NetBSD Foundation, Inc.
@@ -73,7 +73,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: com.c,v 1.244 2006/06/07 22:33:34 kardel Exp $");
+__KERNEL_RCSID(0, "$NetBSD: com.c,v 1.245 2006/06/25 00:39:21 perry Exp $");
 
 #include "opt_com.h"
 #include "opt_ddb.h"
@@ -157,6 +157,7 @@ void	com_modem(struct com_softc *, int);
 void	tiocm_to_com(struct com_softc *, u_long, int);
 int	com_to_tiocm(struct com_softc *);
 void	com_iflush(struct com_softc *);
+void	com_power(int, void *);
 
 int	com_common_getc(dev_t, bus_space_tag_t, bus_space_handle_t);
 void	com_common_putc(dev_t, bus_space_tag_t, bus_space_handle_t, int);
@@ -606,6 +607,11 @@ com_attach_subr(struct com_softc *sc)
 
 	com_config(sc);
 
+	sc->sc_powerhook = powerhook_establish(com_power, sc);
+	if (sc->sc_powerhook == NULL)
+		printf("%s: WARNING: unable to establish power hook\n",
+			sc->sc_dev.dv_xname);
+
 	SET(sc->sc_hwflags, COM_HW_DEV_OK);
 }
 
@@ -669,6 +675,9 @@ com_detach(struct device *self, int flags)
 	struct com_softc *sc = (struct com_softc *)self;
 	int maj, mn;
 
+	/* kill the power hook */
+	powerhook_disestablish(sc->sc_powerhook);
+
 	/* locate the major number */
 	maj = cdevsw_lookup_major(&com_cdevsw);
 
@@ -2580,3 +2589,26 @@ com_is_console(bus_space_tag_t iot, bus_addr_t iobase, bus_space_handle_t *ioh)
 		*ioh = help;
 	return (1);
 }
+
+void
+com_power(int why, void *arg)
+{
+	struct com_softc *sc = arg;
+	int s;
+
+	s = splserial();
+	switch (why) {
+	case PWR_SUSPEND:
+	case PWR_STANDBY:
+		/* XXX should we do something to stop the device? */
+		break;
+	case PWR_RESUME:
+		com_loadchannelregs(sc);
+		break;
+	case PWR_SOFTSUSPEND:
+	case PWR_SOFTSTANDBY:
+	case PWR_SOFTRESUME:
+		break;
+	}
+	splx(s);
+}
diff --git a/sys/dev/ic/comvar.h b/sys/dev/ic/comvar.h
index 311321408f09..ec328f28f6d1 100644
--- a/sys/dev/ic/comvar.h
+++ b/sys/dev/ic/comvar.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: comvar.h,v 1.52 2006/06/07 22:33:35 kardel Exp $	*/
+/*	$NetBSD: comvar.h,v 1.53 2006/06/25 00:39:21 perry Exp $	*/
 
 /*
  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
@@ -151,6 +151,7 @@ struct com_softc {
 #if NRND > 0 && defined(RND_COM)
 	rndsource_element_t  rnd_source;
 #endif
+	void			*sc_powerhook;	/* power management hook */
 	struct simplelock	sc_lock;
 };