From a4692ac2d639a4a2a32e979ed0c47cbeb0800ada Mon Sep 17 00:00:00 2001
From: Thomas White <taw@bitwiz.org.uk>
Date: Wed, 28 Oct 2009 23:47:10 +0100
Subject: Make compilation of KMS parts optional

Configure with --enable-kms to enable the KMS parts.  With this option, the driver will
include both traditional (fbdev-based) and KMS drivers, and will choose between the two
at runtime depending on the kernel.  Without this option, the driver will be exactly as
the traditional driver.
---
 configure.ac       | 26 ++++++++++++++++++++++++--
 src/Makefile.am    | 19 +++++++++++--------
 src/glamo-driver.c |  8 ++++++++
 3 files changed, 43 insertions(+), 10 deletions(-)

diff --git a/configure.ac b/configure.ac
index d9b08a9..f7fac57 100644
--- a/configure.ac
+++ b/configure.ac
@@ -63,6 +63,7 @@ AC_ARG_ENABLE(engine-ioctls, AS_HELP_STRING([--enable-engine-ioctls],
                                  ioctls to enable/disable engines. This requires
                                  kernel support. (default: disabled)]),
              [HAVE_ENGINE_IOCTLS=$enableval], [HAVE_ENGINE_IOCTLS=no])
+
 # Checks for extensions
 XORG_DRIVER_CHECK_EXT(RANDR, randrproto)
 XORG_DRIVER_CHECK_EXT(RENDER, renderproto)
@@ -81,9 +82,28 @@ if test "x$HAVE_ENGINE_IOCTLS" = xyes; then
     AC_DEFINE(HAVE_ENGINE_IOCTLS, 1, [Use ioctls to enable/disable engines])
 fi
 
+# Check if KMS is to be included
+AC_MSG_CHECKING([whether to use KMS])
+AC_DEFINE(ENABLE_KMS, 1, [Define to 1 if KMS is to be supported])
+AC_ARG_ENABLE(kms,
+[  --enable-kms    Include support for kernel modesetting (KMS)],
+[case "${enableval}" in
+  yes) kms=true
+       AC_MSG_RESULT([yes]) ;;
+  no)  kms=false
+       AC_MSG_RESULT([no]) ;;
+  *) AC_MSG_ERROR(bad value ${enableval} for --enable-kms) ;;
+esac],
+[kms=false
+AC_MSG_RESULT([no])])
+AM_CONDITIONAL([ENABLE_KMS], test x$kms = xtrue)
+AC_SUBST([ENABLE_KMS])
+
 # Checks for libraries.
-PKG_CHECK_MODULES(DRI, [libdrm xf86driproto])
-CFLAGS="$XORG_CFLAGS $DRI_CFLAGS"
+if test x$kms = xtrue; then
+    PKG_CHECK_MODULES(DRI, [libdrm xf86driproto])
+    AC_SUBST([LIBDRM_LIBS])
+fi
 
 # Checks for header files.
 AC_HEADER_STDC
@@ -97,6 +117,8 @@ AC_SUBST([DRIVER_NAME])
 XORG_MANPAGE_SECTIONS
 XORG_RELEASE_VERSION
 
+CFLAGS="$XORG_CFLAGS $DRI_CFLAGS"
+
 AC_OUTPUT([
 	Makefile
 	src/Makefile
diff --git a/src/Makefile.am b/src/Makefile.am
index a1e8d0a..59e88a9 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -25,7 +25,7 @@
 # TODO: -nostdlib/-Bstatic/-lgcc platform magic, not installing the .a, etc.
 AM_CFLAGS = @XORG_CFLAGS@ @DRI_CFLAGS@ -pedantic -Wall -Werror -std=gnu99
 glamo_drv_la_LTLIBRARIES = glamo_drv.la
-glamo_drv_la_LDFLAGS = -module -avoid-version -ldrm -ldrm_glamo
+glamo_drv_la_LDFLAGS = -module -avoid-version @LIBDRM_LIBS@
 glamo_drv_ladir = @moduledir@/drivers
 
 glamo_drv_la_SOURCES = \
@@ -35,10 +35,13 @@ glamo_drv_la_SOURCES = \
          glamo-draw.c \
          glamo-display.c \
          glamo-output.c \
-         glamo-engine.c \
-         glamo-kms-driver.c \
-         glamo-kms-crtc.c \
-         glamo-kms-output.c \
-         glamo-dri2.c \
-         glamo-kms-exa.c \
-         glamo-drm.c
+         glamo-engine.c
+
+if ENABLE_KMS
+glamo_drv_la_SOURCES += glamo-kms-driver.c \
+	glamo-kms-crtc.c \
+	glamo-kms-output.c \
+	glamo-dri2.c \
+	glamo-kms-exa.c \
+	glamo-drm.c
+endif
diff --git a/src/glamo-driver.c b/src/glamo-driver.c
index 17b661e..283825e 100644
--- a/src/glamo-driver.c
+++ b/src/glamo-driver.c
@@ -325,6 +325,8 @@ GlamoFbdevProbe(DriverPtr drv, GDevPtr *devSections, int numDevSections)
 	return foundScreen;
 }
 
+#ifdef ENABLE_KMS
+
 static Bool
 GlamoKMSProbe(DriverPtr drv, GDevPtr *devSections, int numDevSections)
 {
@@ -367,6 +369,8 @@ GlamoKMSProbe(DriverPtr drv, GDevPtr *devSections, int numDevSections)
 	return foundScreen;
 }
 
+#endif  /* ENABLE_KMS */
+
 static Bool
 GlamoProbe(DriverPtr drv, int flags)
 {
@@ -384,11 +388,15 @@ GlamoProbe(DriverPtr drv, int flags)
 	if (numDevSections <= 0) return FALSE;
 
 	/* Is today a good day to use KMS? */
+#ifdef ENABLE_KMS
 	if ( GlamoKernelModesettingAvailable() ) {
 		foundScreen = GlamoKMSProbe(drv, devSections, numDevSections);
 	} else {
 		foundScreen = GlamoFbdevProbe(drv, devSections, numDevSections);
 	}
+#else  /* ENABLE_KMS */
+	foundScreen = GlamoFbdevProbe(drv, devSections, numDevSections);
+#endif  /* ENABLE_KMS */
 
 	xfree(devSections);
 	TRACE("probe done");
-- 
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