From f753d699fd2d1832e06d9eb3fd2e706fdb15fa39 Mon Sep 17 00:00:00 2001
From: nia <nia@NetBSD.org>
Date: Mon, 6 May 2024 01:14:34 +0200
Subject: backlight control and console detection for wsdisplay systems

based on a patch by Michael Lorenz.

Signed-off-by: Nia Alarie <nia@NetBSD.org>
Part-of: <https://gitlab.freedesktop.org/xorg/driver/xf86-video-r128/-/merge_requests/7>
---
 src/r128.h        |  1 +
 src/r128_driver.c | 27 +++++++++++++++++++++++++-
 src/r128_output.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++----
 3 files changed, 80 insertions(+), 5 deletions(-)

diff --git a/src/r128.h b/src/r128.h
index bec0426..fa4d5ba 100644
--- a/src/r128.h
+++ b/src/r128.h
@@ -310,6 +310,7 @@ typedef struct {
 
 #ifdef HAVE_DEV_WSCONS_WSCONSIO_H
     Bool              HaveWSDisplay;
+    Bool              HaveBacklightControl;
 #endif
 
     unsigned long     LinearAddr;   /* Frame buffer physical address         */
diff --git a/src/r128_driver.c b/src/r128_driver.c
index b44f3a3..0821323 100644
--- a/src/r128_driver.c
+++ b/src/r128_driver.c
@@ -115,7 +115,6 @@
 #include <X11/extensions/dpms.h>
 #endif
 
-
 static Bool R128CloseScreen(CLOSE_SCREEN_ARGS_DECL);
 static Bool R128SaveScreen(ScreenPtr pScreen, int mode);
 static void R128Save(ScrnInfoPtr pScrn);
@@ -1455,6 +1454,9 @@ R128PreInitAccel(ScrnInfoPtr pScrn)
 Bool R128PreInit(ScrnInfoPtr pScrn, int flags)
 {
     R128InfoPtr      info;
+#ifdef WSDISPLAYIO_GET_BUSID
+    struct wsdisplayio_bus_id bid;
+#endif
 
     DEBUG(xf86DrvMsg(pScrn->scrnIndex, X_INFO,
                         "%s\n", __func__));
@@ -1492,6 +1494,29 @@ Bool R128PreInit(ScrnInfoPtr pScrn, int flags)
 	       PCI_DEV_DEV(info->PciInfo),
 	       PCI_DEV_FUNC(info->PciInfo));
 
+#ifdef WSDISPLAYIO_GET_BUSID
+    /* now check if this is the console */
+    info->HaveWSDisplay = FALSE;
+    info->HaveBacklightControl = FALSE;
+    if (ioctl(xf86Info.consoleFd, WSDISPLAYIO_GET_BUSID, &bid) != -1) {
+    	if ((bid.bus_type == WSDISPLAYIO_BUS_PCI) &&
+    	    (bid.ubus.pci.bus == PCI_DEV_BUS(info->PciInfo)) &&
+    	    (bid.ubus.pci.device == PCI_DEV_DEV(info->PciInfo)) &&
+    	    (bid.ubus.pci.function == PCI_DEV_FUNC(info->PciInfo))) {
+    	    	struct wsdisplay_param p;
+    	    	info->HaveWSDisplay = TRUE;
+
+#ifdef WSDISPLAYIO_PARAM_BACKLIGHT
+    	    	/* now see if we have hacklight control */
+    	    	p.param = WSDISPLAYIO_PARAM_BACKLIGHT;
+		if (ioctl(xf86Info.consoleFd, WSDISPLAYIO_GETPARAM, &p) != -1) {
+		    info->HaveBacklightControl = TRUE;
+		}
+#endif
+    	}
+    }
+#endif
+
 #ifndef XSERVER_LIBPCIACCESS
     info->PciTag        = pciTag(PCI_DEV_BUS(info->PciInfo),
 				PCI_DEV_DEV(info->PciInfo),
diff --git a/src/r128_output.c b/src/r128_output.c
index 737d8b1..275ebcc 100644
--- a/src/r128_output.c
+++ b/src/r128_output.c
@@ -33,8 +33,15 @@
 #include <string.h>
 #include <stdio.h>
 
+#ifdef HAVE_DEV_WSCONS_WSCONSIO_H
+#include <sys/ioctl.h>
+#include <dev/wscons/wsconsio.h>
+#endif
+
 #include "xf86.h"
 #include "xf86Modes.h"
+#include "xf86Priv.h"
+#include "xf86Privstr.h"
 
 #ifdef HAVE_XEXTPROTO_71
 #include "X11/extensions/dpmsconst.h"
@@ -211,9 +218,20 @@ void R128DPMSSetOn(xf86OutputPtr output)
 
     switch(MonType) {
     case MT_LCD:
-        OUTREGP(R128_LVDS_GEN_CNTL, R128_LVDS_BLON, ~R128_LVDS_BLON);
-        usleep(r128_output->PanelPwrDly * 1000);
-        OUTREGP(R128_LVDS_GEN_CNTL, R128_LVDS_ON, ~R128_LVDS_ON);
+#ifdef WSDISPLAYIO_PARAM_BACKLIGHT
+	if (info->HaveBacklightControl) {
+	    struct wsdisplay_param p;
+
+	    p.param = WSDISPLAYIO_PARAM_BACKLIGHT;
+	    p.curval = 1;
+	    ioctl(xf86Info.consoleFd, WSDISPLAYIO_SETPARAM, &p);
+	} else
+#endif
+	{
+	    OUTREGP(R128_LVDS_GEN_CNTL, R128_LVDS_BLON, ~R128_LVDS_BLON);
+	    usleep(r128_output->PanelPwrDly * 1000);
+	    OUTREGP(R128_LVDS_GEN_CNTL, R128_LVDS_ON, ~R128_LVDS_ON);
+	}
         save->lvds_gen_cntl |=     (R128_LVDS_ON | R128_LVDS_BLON);
         break;
     case MT_DFP:
@@ -240,7 +258,18 @@ void R128DPMSSetOff(xf86OutputPtr output)
 
     switch(MonType) {
     case MT_LCD:
-        OUTREGP(R128_LVDS_GEN_CNTL, 0, ~(R128_LVDS_BLON | R128_LVDS_ON));
+#ifdef WSDISPLAYIO_PARAM_BACKLIGHT
+	if (info->HaveBacklightControl) {
+	    struct wsdisplay_param p;
+
+	    p.param = WSDISPLAYIO_PARAM_BACKLIGHT;
+	    p.curval = 0;
+	    ioctl(xf86Info.consoleFd, WSDISPLAYIO_SETPARAM, &p);
+	} else
+#endif
+	{
+            OUTREGP(R128_LVDS_GEN_CNTL, 0, ~(R128_LVDS_BLON | R128_LVDS_ON));
+        }
         save->lvds_gen_cntl &=         ~(R128_LVDS_BLON | R128_LVDS_ON);
         break;
     case MT_DFP:
@@ -269,6 +298,26 @@ static R128MonitorType R128DisplayDDCConnected(xf86OutputPtr output)
     uint32_t mask1, mask2;
 
     if (r128_output->type == OUTPUT_LVDS) {
+#ifdef WSDISPLAYIO_GET_EDID
+	if (info->HaveWSDisplay) {
+	    struct wsdisplayio_edid_info ei;
+	    char *buffer;
+	    xf86MonPtr tmp;
+
+	    buffer = malloc(1024);
+	    ei.edid_data = buffer;
+	    ei.buffer_size = 1024;
+	    if (ioctl(xf86Info.consoleFd, WSDISPLAYIO_GET_EDID, &ei) != -1) {
+		xf86Msg(X_INFO, "got %d bytes worth of EDID from wsdisplay\n",
+	    	ei.data_size);
+	    	tmp = xf86InterpretEEDID(pScrn->scrnIndex, buffer);
+	    	tmp->flags |= MONITOR_EDID_COMPLETE_RAWDATA;
+	    	*MonInfo = tmp;
+	    	xf86OutputSetEDID(output, tmp);
+	    } else
+	        free(buffer);
+	}
+#endif
         return MT_LCD;
     } else if (r128_output->type == OUTPUT_VGA) {
         mask1 = R128_GPIO_MONID_MASK_1 | (pR128Ent->HasCRTC2 ? R128_GPIO_MONID_MASK_3 : R128_GPIO_MONID_MASK_2);
-- 
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