From 9326acc2917109f06dda809107c8fa5a2273c3d2 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sun, 23 Sep 2012 13:40:04 +0100
Subject: Allow compilation of a separate i810 driver

Allow --enable-ums-only as a counter-option to --enable-kms-only in case
the distribution wishes to enable a non-root KMS driver but also offer
a separate UMS driver for i81x.

On the second pass, use "--enable-ums-only --disable-uxa --disable-sna"
to get the trimmed down unaccelerated i810 support.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 configure.ac       | 14 +++++++++++---
 src/intel_module.c | 16 +++++++++++++---
 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/configure.ac b/configure.ac
index 6b0b0a8b..1cd5a92c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -125,6 +125,10 @@ AC_ARG_ENABLE(kms-only, AS_HELP_STRING([--enable-kms-only],
                                   [Assume KMS support [[default=no]]]),
               [KMS_ONLY="$enableval"],
               [KMS_ONLY=no])
+AC_ARG_ENABLE(ums-only, AS_HELP_STRING([--enable-ums-only],
+                                  [Assume only UMS (no KMS) support [[default=no]]]),
+              [UMS_ONLY="$enableval"],
+              [UMS_ONLY=no])
 
 required_xorg_xserver_version=1.6
 required_pixman_version=0.24
@@ -230,12 +234,12 @@ if test "x$accel" = xauto; then
 			accel=sna
 		fi
 	fi
-	if test "x$accel" = xauto; then
+	if test "x$accel" = xauto -a "x$UMS_ONLY" != "xyes"; then
 		AC_MSG_ERROR([No default acceleration option])
 	fi
 fi
 
-have_accel=no
+have_accel=none
 if test "x$accel" = xsna; then
 	if test "x$SNA" != "xno"; then
 		AC_DEFINE(DEFAULT_ACCEL_METHOD, SNA, [Default acceleration method])
@@ -254,7 +258,7 @@ if test "x$accel" = xuxa; then
 	fi
 fi
 AC_MSG_RESULT($accel)
-if test "x$accel" = xno; then
+if test "x$accel" = xnone -a "x$UMS_ONLY" != "xyes"; then
 	AC_MSG_ERROR([No default acceleration option])
 fi
 
@@ -361,6 +365,10 @@ AM_CONDITIONAL(KMS_ONLY, test x$KMS_ONLY = xyes)
 if test "x$KMS_ONLY" = xyes; then
 	AC_DEFINE(KMS_ONLY,1,[Assume KMS support])
 fi
+AM_CONDITIONAL(UMS_ONLY, test x$UMS_ONLY = xyes)
+if test "x$UMS_ONLY" = xyes; then
+	AC_DEFINE(UMS_ONLY,1,[Assume only UMS (no KMS) support])
+fi
 
 AM_CONDITIONAL(DEBUG, test x$DEBUG != xno)
 AM_CONDITIONAL(FULL_DEBUG, test x$FULL_DEBUG == xfull)
diff --git a/src/intel_module.c b/src/intel_module.c
index bc0b6d25..7de9da7e 100644
--- a/src/intel_module.c
+++ b/src/intel_module.c
@@ -214,6 +214,7 @@ static const struct pci_id_match intel_device_match[] = {
 	INTEL_DEVICE_MATCH (PCI_CHIP_I815, &intel_i81x_info ),
 #endif
 
+#if !UMS_ONLY
 	INTEL_DEVICE_MATCH (PCI_CHIP_I830_M, &intel_i830_info ),
 	INTEL_DEVICE_MATCH (PCI_CHIP_845_G, &intel_i845_info ),
 	INTEL_DEVICE_MATCH (PCI_CHIP_I854, &intel_i855_info ),
@@ -309,6 +310,8 @@ static const struct pci_id_match intel_device_match[] = {
 	INTEL_DEVICE_MATCH (PCI_CHIP_VALLEYVIEW_PO, &intel_valleyview_info ),
 
 	INTEL_DEVICE_MATCH (PCI_MATCH_ANY, &intel_generic_info ),
+#endif
+
 	{ 0, 0, 0 },
 };
 
@@ -422,6 +425,7 @@ static Bool has_kernel_mode_setting(struct pci_device *dev)
 	return ret;
 }
 
+#if !UMS_ONLY
 extern XF86ConfigPtr xf86configptr;
 
 static XF86ConfDevicePtr
@@ -459,6 +463,7 @@ static enum accel_method { UXA, SNA } get_accel_method(void)
 
 	return accel_method;
 }
+#endif
 
 /*
  * intel_pci_probe --
@@ -523,6 +528,7 @@ static Bool intel_pci_probe(DriverPtr		driver,
 	}
 #endif
 
+#if !UMS_ONLY
 	switch (get_accel_method()) {
 #if USE_SNA
 	case SNA: return sna_init_scrn(scrn, entity_num);
@@ -531,9 +537,10 @@ static Bool intel_pci_probe(DriverPtr		driver,
 #if USE_UXA
 	case UXA: return intel_init_scrn(scrn);
 #endif
-
-	default: return FALSE;
 	}
+#endif
+
+	return FALSE;
 }
 
 #ifdef XSERVER_PLATFORM_BUS
@@ -577,6 +584,7 @@ intel_platform_probe(DriverPtr driver,
 	xf86DrvMsg(scrn->scrnIndex, X_INFO,
 		   "using device path '%s'\n", path ? path : "Default device");
 
+#if !UMS_ONLY
 	switch (get_accel_method()) {
 #if USE_SNA
         case SNA: return sna_init_scrn(scrn, entity_num);
@@ -584,8 +592,10 @@ intel_platform_probe(DriverPtr driver,
 #if USE_UXA
         case UXA: return intel_init_scrn(scrn);
 #endif
-	default: return FALSE;
 	}
+#endif
+
+	return FALSE;
 }
 #endif
 
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