From f2edca4783582a19cd7116d99d8adf7c1f71e0be Mon Sep 17 00:00:00 2001
From: tobhe <tobhe@openbsd.org>
Date: Wed, 9 Nov 2022 22:56:44 +0000
Subject: [PATCH] Hook up gpiobl(4) to the screen burner instead of
 wsdisplay(4) brightness control. This enables automatic screen blanking with
 X and wscons(4) once wsfb(4) is fixed.

"this is fine for now" kettenis@
---
 sys/dev/fdt/gpiobl.c   | 51 ++++++++++++------------------------------
 sys/dev/fdt/simplefb.c | 15 +++++++++++--
 2 files changed, 27 insertions(+), 39 deletions(-)

diff --git a/sys/dev/fdt/gpiobl.c b/sys/dev/fdt/gpiobl.c
index 9c218694ccb..96c169a68e4 100644
--- a/sys/dev/fdt/gpiobl.c
+++ b/sys/dev/fdt/gpiobl.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: gpiobl.c,v 1.1 2022/11/08 19:06:57 tobhe Exp $	*/
+/*	$OpenBSD: gpiobl.c,v 1.2 2022/11/09 22:56:44 tobhe Exp $	*/
 /*
  * Copyright (c) 2022 Tobias Heider <tobhe@openbsd.org>
  *
@@ -31,6 +31,8 @@
 #include <dev/wscons/wsconsio.h>
 #include <dev/wscons/wsdisplayvar.h>
 
+extern void (*simplefb_burn_hook)(u_int);
+
 struct gpiobl_softc {
 	struct device		sc_dev;
 	int			sc_on;
@@ -51,9 +53,8 @@ struct cfdriver gpiobl_cd = {
 	NULL, "gpiobl", DV_DULL
 };
 
+void gpiobl_set(u_int);
 void gpiobl_task(void *);
-int gpiobl_get_param(struct wsdisplay_param *);
-int gpiobl_set_param(struct wsdisplay_param *);
 
 int
 gpiobl_match(struct device *parent, void *match, void *aux)
@@ -81,47 +82,23 @@ gpiobl_attach(struct device *parent, struct device *self, void *aux)
 	sc_gpiobl = sc;
 
 	task_set(&sc->sc_task, gpiobl_task, sc);
-	ws_get_param = gpiobl_get_param;
-	ws_set_param = gpiobl_set_param;
+
+	simplefb_burn_hook = gpiobl_set;
+
 	printf("\n");
 }
 
 void
-gpiobl_task(void *args)
-{
-	struct gpiobl_softc *sc = args;
-	gpio_controller_set_pin(&sc->sc_gpio[0], sc->sc_on);
-}
-
-int
-gpiobl_get_param(struct wsdisplay_param *dp)
+gpiobl_set(u_int on)
 {
 	struct gpiobl_softc *sc = (struct gpiobl_softc *)sc_gpiobl;
-
-	switch (dp->param) {
-	case WSDISPLAYIO_PARAM_BRIGHTNESS:
-		dp->min = 0;
-		dp->max = 1;
-		dp->curval = sc->sc_on;
-		return 0;
-	default:
-		return -1;
-	}
+	sc->sc_on = on;
+	task_add(systq, &sc->sc_task);
 }
 
-int
-gpiobl_set_param(struct wsdisplay_param *dp)
+void
+gpiobl_task(void *args)
 {
-	struct gpiobl_softc *sc = (struct gpiobl_softc *)sc_gpiobl;
-
-	switch (dp->param) {
-	case WSDISPLAYIO_PARAM_BRIGHTNESS:
-		if (dp->curval == sc->sc_on)
-			return 0;
-		sc->sc_on = !sc->sc_on;
-		task_add(systq, &sc->sc_task);
-		return 0;
-	default:
-		return -1;
-	}
+	struct gpiobl_softc *sc = args;
+	gpio_controller_set_pin(&sc->sc_gpio[0], sc->sc_on);
 }
diff --git a/sys/dev/fdt/simplefb.c b/sys/dev/fdt/simplefb.c
index f9f3e1ef4fc..d205fae1392 100644
--- a/sys/dev/fdt/simplefb.c
+++ b/sys/dev/fdt/simplefb.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: simplefb.c,v 1.18 2022/11/09 22:12:40 kn Exp $	*/
+/*	$OpenBSD: simplefb.c,v 1.19 2022/11/09 22:56:44 tobhe Exp $	*/
 /*
  * Copyright (c) 2016 Mark Kettenis
  *
@@ -74,6 +74,8 @@ struct simplefb_softc {
 	psize_t			sc_psize;
 };
 
+void (*simplefb_burn_hook)(u_int) = NULL;
+
 struct rasops_info simplefb_ri;
 struct wsscreen_descr simplefb_wsd = { "std" };
 struct wsdisplay_charcell simplefb_bs[SIMPLEFB_WIDTH * SIMPLEFB_HEIGHT];
@@ -95,6 +97,7 @@ int	simplefb_wsioctl(void *, u_long, caddr_t, int, struct proc *);
 paddr_t	simplefb_wsmmap(void *, off_t, int);
 int	simplefb_alloc_screen(void *, const struct wsscreen_descr *,
 	    void **, int *, int *, uint32_t *);
+void	simplefb_burn_screen(void *, u_int, u_int);
 
 struct wsdisplay_accessops simplefb_accessops = {
 	.ioctl = simplefb_wsioctl,
@@ -105,7 +108,8 @@ struct wsdisplay_accessops simplefb_accessops = {
 	.getchar = rasops_getchar,
 	.load_font = rasops_load_font,
 	.list_font = rasops_list_font,
-	.scrollback = rasops_scrollback
+	.scrollback = rasops_scrollback,
+	.burn_screen = simplefb_burn_screen,
 };
 
 int
@@ -309,6 +313,13 @@ simplefb_alloc_screen(void *v, const struct wsscreen_descr *type,
     void **cookiep, int *curxp, int *curyp, uint32_t *attrp)
 {
 	return rasops_alloc_screen(v, cookiep, curxp, curyp, attrp);
+} 
+
+void
+simplefb_burn_screen(void *v, u_int on, u_int flags)
+{
+	if (simplefb_burn_hook != NULL)
+		simplefb_burn_hook(on);
 }
 
 #include "ukbd.h"
-- 
2.20.1