tests: add display testing program

Just a simple program to light up all detected outputs at their native
mode and respond to hotplug events.

3 files changed, 726 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 3ab2a8dc..e1afb7f3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -48,6 +48,24 @@ AM_CONDITIONAL(HAVE_DRM, test "x$have_drm" = "xyes")
 
 PKG_CHECK_MODULES(PCIACCESS, [pciaccess >= 0.10])
 
+PKG_CHECK_MODULES(CAIRO, cairo, [HAVE_CAIRO=yes], [HAVE_CAIRO=no])
+if test "x$HAVE_CAIRO" = xyes; then
+	AC_DEFINE(HAVE_CAIRO, 1, [Have cairo support])
+fi
+AM_CONDITIONAL(HAVE_CAIRO, [test "x$HAVE_CAIRO" = xyes])
+
+PKG_CHECK_MODULES(LIBUDEV, libudev, [HAVE_LIBUDEV=yes], [HAVE_LIBUDEV=no])
+if test "x$HAVE_LIBUDEV" = xyes; then
+   	AC_DEFINE(HAVE_LIBUDEV, 1, [Have libudev support])
+fi
+AM_CONDITIONAL(HAVE_LIBUDEV, [test "x$HAVE_LIBUDEV" = xyes])
+
+PKG_CHECK_MODULES(GLIB, glib-2.0, [HAVE_GLIB=yes], [HAVE_GLIB=no])
+if test "x$HAVE_GLIB" = xyes; then
+   	AC_DEFINE(HAVE_GLIB, 1, [Have glib support])
+fi
+AM_CONDITIONAL(HAVE_GLIB, [test "x$HAVE_GLIB" = xyes])
+
 dnl Use lots of warning flags with GCC
 
 WARN_CFLAGS=""
diff --git a/tests/Makefile.am b/tests/Makefile.am
index e9f56310..2bdc3dfd 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -24,5 +24,15 @@ AM_CFLAGS = $(DRM_CFLAGS) $(WARN_CFLAGS) \
 	-I$(srcdir)/../lib
 LDADD = ../lib/libintel_tools.la $(PCIACCESS_LIBS) $(DRM_LIBS) 
 
+if HAVE_CAIRO
+if HAVE_LIBUDEV
+if HAVE_GLIB
+TESTS += testdisplay
+LDADD += $(CAIRO_LIBS) $(LIBUDEV_LIBS) $(GLIB_LIBS)
+AM_CFLAGS += $(CAIRO_CFLAGS) $(LIBUDEV_CFLAGS) $(GLIB_CFLAGS)
+endif
+endif
+endif
+
 gem_fence_thrash_CFLAGS = $(AM_CFLAGS) -pthread
 gem_fence_thrash_LDADD = $(LDADD) -lpthread
diff --git a/tests/testdisplay.c b/tests/testdisplay.c
new file mode 100644
index 00000000..fe9ef36a
--- /dev/null
+++ b/tests/testdisplay.c
@@ -0,0 +1,698 @@
+/*
+ * Copyright 2010 Intel Corporation
+ *   Jesse Barnes <jesse.barnes@intel.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/*
+ * This program is intended for testing of display functionality.  It should
+ * allow for testing of
+ *   - hotplug
+ *   - mode setting
+ *   - clone & twin modes
+ *   - panel fitting
+ *   - test patterns & pixel generators
+ * Additional programs can test the detected outputs against VBT provided
+ * device lists (both docked & undocked).
+ *
+ * TODO:
+ * - pixel generator in transcoder
+ * - test pattern reg in pipe
+ * - test patterns on outputs (e.g. TV)
+ * - handle hotplug (leaks crtcs, can't handle clones)
+ * - allow mode force
+ * - expose output specific controls
+ *  - e.g. DDC-CI brightness
+ *  - HDMI controls
+ *  - panel brightness
+ *  - DP commands (e.g. poweroff)
+ * - verify outputs against VBT/physical connectors
+ */
+#include "config.h"
+
+#include <assert.h>
+#include <cairo.h>
+#include <errno.h>
+#include <glib.h>
+#include <libudev.h>
+#include <math.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/poll.h>
+#include <sys/time.h>
+
+#include "xf86drm.h"
+#include "xf86drmMode.h"
+#include "intel_bufmgr.h"
+#include "i915_drm.h"
+
+struct udev_monitor *uevent_monitor;
+drmModeRes *resources;
+int fd, modes;
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+struct type_name {
+	int type;
+	char *name;
+};
+
+#define type_name_fn(res) \
+static char * res##_str(int type) {			\
+	int i;						\
+	for (i = 0; i < ARRAY_SIZE(res##_names); i++) { \
+		if (res##_names[i].type == type)	\
+			return res##_names[i].name;	\
+	}						\
+	return "(invalid)";				\
+}
+
+struct type_name encoder_type_names[] = {
+	{ DRM_MODE_ENCODER_NONE, "none" },
+	{ DRM_MODE_ENCODER_DAC, "DAC" },
+	{ DRM_MODE_ENCODER_TMDS, "TMDS" },
+	{ DRM_MODE_ENCODER_LVDS, "LVDS" },
+	{ DRM_MODE_ENCODER_TVDAC, "TVDAC" },
+};
+
+type_name_fn(encoder_type)
+
+struct type_name connector_status_names[] = {
+	{ DRM_MODE_CONNECTED, "connected" },
+	{ DRM_MODE_DISCONNECTED, "disconnected" },
+	{ DRM_MODE_UNKNOWNCONNECTION, "unknown" },
+};
+
+type_name_fn(connector_status)
+
+struct type_name connector_type_names[] = {
+	{ DRM_MODE_CONNECTOR_Unknown, "unknown" },
+	{ DRM_MODE_CONNECTOR_VGA, "VGA" },
+	{ DRM_MODE_CONNECTOR_DVII, "DVI-I" },
+	{ DRM_MODE_CONNECTOR_DVID, "DVI-D" },
+	{ DRM_MODE_CONNECTOR_DVIA, "DVI-A" },
+	{ DRM_MODE_CONNECTOR_Composite, "composite" },
+	{ DRM_MODE_CONNECTOR_SVIDEO, "s-video" },
+	{ DRM_MODE_CONNECTOR_LVDS, "LVDS" },
+	{ DRM_MODE_CONNECTOR_Component, "component" },
+	{ DRM_MODE_CONNECTOR_9PinDIN, "9-pin DIN" },
+	{ DRM_MODE_CONNECTOR_DisplayPort, "DisplayPort" },
+	{ DRM_MODE_CONNECTOR_HDMIA, "HDMI-A" },
+	{ DRM_MODE_CONNECTOR_HDMIB, "HDMI-B" },
+	{ DRM_MODE_CONNECTOR_TV, "TV" },
+	{ DRM_MODE_CONNECTOR_eDP, "Embedded DisplayPort" },
+};
+
+type_name_fn(connector_type)
+
+/*
+ * Mode setting with the kernel interfaces is a bit of a chore.
+ * First you have to find the connector in question and make sure the
+ * requested mode is available.
+ * Then you need to find the encoder attached to that connector so you
+ * can bind it with a free crtc.
+ */
+struct connector {
+	uint32_t id;
+	int mode_valid;
+	drmModeModeInfo mode;
+	drmModeEncoder *encoder;
+	drmModeConnector *connector;
+	int crtc;
+};
+
+static void connector_find_preferred_mode(struct connector *c)
+{
+	drmModeConnector *connector;
+	drmModeEncoder *encoder = NULL;
+	int i, j;
+
+	/* First, find the connector & mode */
+	c->mode_valid = 0;
+	connector = drmModeGetConnector(fd, c->id);
+	if (!connector) {
+		fprintf(stderr, "could not get connector %d: %s\n",
+			c->id, strerror(errno));
+		drmModeFreeConnector(connector);
+		return;
+	}
+
+	if (connector->connection != DRM_MODE_CONNECTED) {
+		drmModeFreeConnector(connector);
+		return;
+	}
+
+	if (!connector->count_modes) {
+		fprintf(stderr, "connector %d has no modes\n", c->id);
+		drmModeFreeConnector(connector);
+		return;
+	}
+
+	if (connector->connector_id != c->id) {
+		fprintf(stderr, "connector id doesn't match (%d != %d)\n",
+			connector->connector_id, c->id);
+		drmModeFreeConnector(connector);
+		return;
+	}
+
+	for (j = 0; j < connector->count_modes; j++) {
+		c->mode = connector->modes[j];
+		if (c->mode.flags & DRM_MODE_TYPE_PREFERRED) {
+			c->mode_valid = 1;
+			break;
+		}
+	}
+
+	if (!c->mode_valid) {
+		fprintf(stderr, "failed to find any modes on connector %d\n",
+			c->id);
+		return;
+	}
+
+	/* Now get the encoder */
+	for (i = 0; i < connector->count_encoders; i++) {
+		encoder = drmModeGetEncoder(fd, connector->encoders[i]);
+
+		if (!encoder) {
+			fprintf(stderr, "could not get encoder %i: %s\n",
+				resources->encoders[i], strerror(errno));
+			drmModeFreeEncoder(encoder);
+			continue;
+		}
+
+		break;
+	}
+
+	c->encoder = encoder;
+
+	if (i == resources->count_encoders) {
+		fprintf(stderr, "failed to find encoder\n");
+		c->mode_valid = 0;
+		return;
+	}
+
+	/* Find first CRTC not in use */
+	for (i = 0; i < resources->count_crtcs; i++) {
+		if (resources->crtcs[i])
+			break;
+	}
+	c->crtc = resources->crtcs[i];
+	resources->crtcs[i] = 0;
+	c->connector = connector;
+}
+
+static drm_intel_bo *
+allocate_buffer(drm_intel_bufmgr *bufmgr,
+		int width, int height, int *stride)
+{
+	int size;
+
+	/* Scan-out has a 64 byte alignment restriction */
+	width *= 4; /* 32bpp */
+	size = (width + 63) & -64;
+	*stride = size;
+	size *= height;
+
+	return drm_intel_bo_alloc(bufmgr, "frontbuffer", size, 0);
+}
+
+enum corner {
+	topleft,
+	topright,
+	bottomleft,
+	bottomright,
+};
+
+static void
+paint_marker(cairo_t *cr, int x, int y, char *str, enum corner text_location)
+{
+	cairo_text_extents_t extents;
+	int xoff, yoff;
+
+	cairo_set_font_size(cr, 18);
+	cairo_text_extents(cr, str, &extents);
+
+	switch (text_location) {
+	case topleft:
+		xoff = -20;
+		xoff -= extents.width;
+		yoff = -20;
+		break;
+	case topright:
+		xoff = 20;
+		yoff = -20;
+		break;
+	case bottomleft:
+		xoff = -20;
+		xoff -= extents.width;
+		yoff = 20;
+		break;
+	case bottomright:
+		xoff = 20;
+		yoff = 20;
+		break;
+	default:
+		xoff = 0;
+		yoff = 0;
+	}
+
+	cairo_move_to(cr, x, y - 20);
+	cairo_line_to(cr, x, y + 20);
+	cairo_move_to(cr, x - 20, y);
+	cairo_line_to(cr, x + 20, y);
+	cairo_new_sub_path(cr);
+	cairo_arc(cr, x, y, 10, 0, M_PI * 2);
+	cairo_set_line_width(cr, 4);
+	cairo_set_source_rgb(cr, 0, 0, 0);
+	cairo_stroke_preserve(cr);
+	cairo_set_source_rgb(cr, 1, 1, 1);
+	cairo_set_line_width(cr, 2);
+	cairo_stroke(cr);
+
+	cairo_move_to(cr, x + xoff, y + yoff);
+	cairo_text_path(cr, str);
+	cairo_set_source_rgb(cr, 0, 0, 0);
+	cairo_stroke_preserve(cr);
+	cairo_set_source_rgb(cr, 1, 1, 1);
+	cairo_fill(cr);
+}
+
+static void
+paint_output_info(cairo_t *cr, struct connector *c, int width, int height)
+{
+	cairo_text_extents_t name_extents, mode_extents;
+	char name_buf[128], mode_buf[128];
+	int i, x, y, modes_x, modes_y;
+
+	/* Get text extents for each string */
+	snprintf(name_buf, sizeof name_buf, "%s",
+		 connector_type_str(c->connector->connector_type));
+	cairo_set_font_size(cr, 48);
+	cairo_select_font_face(cr, "Helvetica",
+			       CAIRO_FONT_SLANT_NORMAL,
+			       CAIRO_FONT_WEIGHT_NORMAL);
+	cairo_text_extents(cr, name_buf, &name_extents);
+
+	snprintf(mode_buf, sizeof mode_buf, "%s @ %dHz on %s encoder",
+		 c->mode.name, c->mode.vrefresh,
+		 encoder_type_str(c->encoder->encoder_type));
+	cairo_set_font_size(cr, 36);
+	cairo_text_extents(cr, mode_buf, &mode_extents);
+
+	/* Paint output name */
+	x = width / 2;
+	x -= name_extents.width / 2;
+	y = height / 2;
+	y -= (name_extents.height / 2) - (mode_extents.height / 2) - 10;
+	cairo_set_font_size(cr, 48);
+	cairo_move_to(cr, x, y);
+	cairo_text_path(cr, name_buf);
+	cairo_set_source_rgb(cr, 0, 0, 0);
+	cairo_stroke_preserve(cr);
+	cairo_set_source_rgb(cr, 1, 1, 1);
+	cairo_fill(cr);
+
+	/* Paint mode name */
+	x = width / 2;
+	x -= mode_extents.width / 2;
+	modes_x = x;
+	y = height / 2;
+	y += (mode_extents.height / 2) + (name_extents.height / 2) + 10;
+	cairo_set_font_size(cr, 36);
+	cairo_move_to(cr, x, y);
+	cairo_text_path(cr, mode_buf);
+	cairo_set_source_rgb(cr, 0, 0, 0);
+	cairo_stroke_preserve(cr);
+	cairo_set_source_rgb(cr, 1, 1, 1);
+	cairo_fill(cr);
+
+	/* List available modes */
+	snprintf(mode_buf, sizeof mode_buf, "Available modes:");
+	cairo_set_font_size(cr, 18);
+	cairo_text_extents(cr, mode_buf, &mode_extents);
+	x = modes_x;
+	modes_x = x + mode_extents.width;
+	y += mode_extents.height + 10;
+	modes_y = y;
+	cairo_move_to(cr, x, y);
+	cairo_text_path(cr, mode_buf);
+	cairo_set_source_rgb(cr, 0, 0, 0);
+	cairo_stroke_preserve(cr);
+	cairo_set_source_rgb(cr, 1, 1, 1);
+	cairo_fill(cr);
+
+	for (i = 0; i < c->connector->count_modes; i++) {
+		snprintf(mode_buf, sizeof mode_buf, "%s @ %dHz",
+			 c->connector->modes[i].name,
+			 c->connector->modes[i].vrefresh);
+		cairo_set_font_size(cr, 18);
+		cairo_text_extents(cr, mode_buf, &mode_extents);
+		x = modes_x - mode_extents.width; /* right justify modes */
+		y += mode_extents.height + 10;
+		if (y + mode_extents.height >= height) {
+			y = modes_y + mode_extents.height + 10;
+			modes_x += mode_extents.width + 10;
+			x = modes_x - mode_extents.width;
+		}
+		cairo_move_to(cr, x, y);
+		cairo_text_path(cr, mode_buf);
+		cairo_set_source_rgb(cr, 0, 0, 0);
+		cairo_stroke_preserve(cr);
+		cairo_set_source_rgb(cr, 1, 1, 1);
+		cairo_fill(cr);
+	}
+}
+
+static int
+create_test_buffer(drm_intel_bufmgr *bufmgr, int width, int height,
+		   int *stride_out, drm_intel_bo **bo_out)
+{
+	drm_intel_bo *bo;
+	int ret, stride;
+
+	bo = allocate_buffer(bufmgr, width, height, &stride);
+	if (!bo) {
+		fprintf(stderr, "failed to alloc buffer: %s\n",
+
+			strerror(errno));
+		return -1;
+	}
+
+	ret = drm_intel_gem_bo_map_gtt(bo);
+	if (ret) {
+		fprintf(stderr, "failed to GTT map buffer: %s\n",
+			strerror(errno));
+		return -1;
+	}
+
+	*bo_out = bo;
+	*stride_out = stride;
+	return 0;
+}
+
+static void
+set_mode(struct connector *c)
+{
+	drm_intel_bufmgr *bufmgr;
+	drm_intel_bo *bo;
+	unsigned int fb_id;
+	int ret, width, height, stride;
+	cairo_surface_t *surface;
+	cairo_t *cr;
+	char buf[128];
+
+	width = 0;
+	height = 0;
+	connector_find_preferred_mode(c);
+	if (!c->mode_valid)
+		return;
+
+	width += c->mode.hdisplay;
+	if (height < c->mode.vdisplay)
+		height = c->mode.vdisplay;
+
+	bufmgr = drm_intel_bufmgr_gem_init(fd, 2<<20);
+	if (!bufmgr) {
+		fprintf(stderr, "failed to init bufmgr: %s\n", strerror(errno));
+		return;
+	}
+
+	if (create_test_buffer(bufmgr, width, height, &stride, &bo))
+		return;
+
+	surface = cairo_image_surface_create_for_data(bo->virtual,
+						      CAIRO_FORMAT_ARGB32,
+						      width, height,
+						      stride);
+	cr = cairo_create(surface);
+	cairo_surface_destroy(surface);
+
+	cairo_set_line_cap(cr, CAIRO_LINE_CAP_SQUARE);
+
+	/* Paint corner markers */
+	snprintf(buf, sizeof buf, "(%d, %d)", 0, 0);
+	paint_marker(cr, 0, 0, buf, bottomright);
+	snprintf(buf, sizeof buf, "(%d, %d)", width, 0);
+	paint_marker(cr, width, 0, buf, bottomleft);
+	snprintf(buf, sizeof buf, "(%d, %d)", 0, height);
+	paint_marker(cr, 0, height, buf, topright);
+	snprintf(buf, sizeof buf, "(%d, %d)", width, height);
+	paint_marker(cr, width, height, buf, topleft);
+
+	/* Paint output info */
+	paint_output_info(cr, c, width, height);
+
+	cairo_destroy(cr);
+	drm_intel_gem_bo_unmap_gtt(bo);
+
+	ret = drmModeAddFB(fd, width, height, 32, 32, stride, bo->handle,
+			   &fb_id);
+	if (ret) {
+		fprintf(stderr, "failed to add fb: %s\n", strerror(errno));
+		return;
+	}
+
+	if (!c->mode_valid)
+		return;
+
+	ret = drmModeSetCrtc(fd, c->crtc, fb_id, 0, 0,
+			     &c->id, 1, &c->mode);
+
+	if (ret) {
+		fprintf(stderr, "failed to set mode: %s\n", strerror(errno));
+		return;
+	}
+
+	drmModeFreeEncoder(c->encoder);
+	drmModeFreeConnector(c->connector);
+}
+
+/*
+ * Re-probe outputs and light up as many as possible.
+ *
+ * On Intel, we have two CRTCs that we can drive independently with
+ * different timings and scanout buffers.
+ *
+ * Each connector has a corresponding encoder, except in the SDVO case
+ * where an encoder may have multiple connectors.
+ */
+static void update_display(void)
+{
+	struct connector *connectors;
+	int c;
+
+	resources = drmModeGetResources(fd);
+	if (!resources) {
+		fprintf(stderr, "drmModeGetResources failed: %s\n",
+			strerror(errno));
+		return;
+	}
+
+	connectors = calloc(resources->count_connectors,
+			    sizeof(struct connector));
+	if (!connectors)
+		return;
+
+	/* Find any connected displays */
+	for (c = 0; c < resources->count_connectors; c++) {
+		connectors[c].id = resources->connectors[c];
+		set_mode(&connectors[c]);
+	}
+	drmModeFreeResources(resources);
+}
+
+extern char *optarg;
+extern int optind, opterr, optopt;
+static char optstr[] = "h";
+
+static void usage(char *name)
+{
+	fprintf(stderr, "usage: %s [-h]\n", name);
+	exit(0);
+}
+
+static gboolean hotplug_event(GIOChannel *source, GIOCondition condition,
+			      gpointer data)
+{
+	gchar buf[256];
+	gsize count;
+	struct udev_device *dev;
+	dev_t udev_devnum;
+	struct stat s;
+	const char *hotplug;
+
+	g_io_channel_read(source, buf, 256, &count);
+
+	dev = udev_monitor_receive_device(uevent_monitor);
+	if (!dev)
+		goto out;
+
+	udev_devnum = udev_device_get_devnum(dev);
+	fstat(fd, &s);
+
+	hotplug = udev_device_get_property_value(dev, "HOTPLUG");
+
+	if (memcmp(&s.st_rdev, &udev_devnum, sizeof(dev_t)) == 0 &&
+	    hotplug && atoi(hotplug) == 1)
+		update_display();
+
+	udev_device_unref(dev);
+out:
+	return TRUE;
+}
+
+static gboolean input_event(GIOChannel *source, GIOCondition condition,
+			    gpointer data)
+{
+	gchar buf[256];
+	gsize count;
+
+	g_io_channel_read(source, buf, 255, &count);
+	buf[count] = '\0';
+
+	if (buf[0] == 'q' && (count == 1 || buf[1] == '\n'))
+		exit(0);
+
+	return TRUE;
+}
+
+int main(int argc, char **argv)
+{
+	int c;
+	int encoders = 0, connectors = 0, crtcs = 0, framebuffers = 0;
+	char *modules[] = { "i915" };
+	int i;
+	struct udev *u;
+	int ret = 0;
+	GIOChannel *udevchannel, *stdinchannel;
+	GMainLoop *mainloop;
+
+	opterr = 0;
+	while ((c = getopt(argc, argv, optstr)) != -1) {
+		switch (c) {
+		default:
+			fprintf(stderr, "unknown option %c\n", c);
+			/* fall through */
+		case 'h':
+			usage(argv[0]);
+			break;
+		}
+	}
+
+	if (argc == 1)
+		encoders = connectors = crtcs = modes = framebuffers = 1;
+
+	for (i = 0; i < ARRAY_SIZE(modules); i++) {
+		fd = drmOpen(modules[i], NULL);
+		if (fd < 0)
+			printf("failed to load %s driver.\n", modules[i]);
+		else
+			break;
+	}
+
+	if (i == ARRAY_SIZE(modules)) {
+		fprintf(stderr, "failed to load any modules, aborting.\n");
+		ret = -1;
+		goto out;
+	}
+
+	u = udev_new();
+	if (!u) {
+		fprintf(stderr, "failed to create udev object\n");
+		ret = -1;
+		goto out_close;
+	}
+
+	uevent_monitor = udev_monitor_new_from_netlink(u, "udev");
+	if (!uevent_monitor) {
+		fprintf(stderr, "failed to create udev event monitor\n");
+		ret = -1;
+		goto out_udev_unref;
+	}
+
+	ret = udev_monitor_filter_add_match_subsystem_devtype(uevent_monitor,
+							      "drm",
+							      "drm_minor");
+	if (ret < 0) {
+		fprintf(stderr, "failed to filter for drm events\n");
+		goto out_udev_mon_unref;
+	}
+
+	ret = udev_monitor_enable_receiving(uevent_monitor);
+	if (ret < 0) {
+		fprintf(stderr, "failed to enable udev event reception\n");
+		goto out_udev_mon_unref;
+	}
+
+	mainloop = g_main_loop_new(NULL, FALSE);
+	if (!mainloop) {
+		fprintf(stderr, "failed to create glib mainloop\n");
+		ret = -1;
+		goto out_mainloop_unref;
+	}
+
+	udevchannel =
+		g_io_channel_unix_new(udev_monitor_get_fd(uevent_monitor));
+	if (!udevchannel) {
+		fprintf(stderr, "failed to create udev GIO channel\n");
+		goto out_mainloop_unref;
+	}
+
+	ret = g_io_add_watch(udevchannel, G_IO_IN | G_IO_ERR, hotplug_event,
+			     u);
+	if (ret < 0) {
+		fprintf(stderr, "failed to add watch on udev GIO channel\n");
+		goto out_udev_off;
+	}
+
+	stdinchannel = g_io_channel_unix_new(0);
+	if (!stdinchannel) {
+		fprintf(stderr, "failed to create stdin GIO channel\n");
+		goto out_udev_off;
+	}
+
+	ret = g_io_add_watch(stdinchannel, G_IO_IN | G_IO_ERR, input_event,
+			     NULL);
+	if (ret < 0) {
+		fprintf(stderr, "failed to add watch on stdin GIO channel\n");
+		goto out_stdio_off;
+	}
+
+	update_display();
+	g_main_loop_run(mainloop);
+
+out_stdio_off:
+	g_io_channel_shutdown(stdinchannel, TRUE, NULL);
+out_udev_off:
+	g_io_channel_shutdown(udevchannel, TRUE, NULL);
+out_mainloop_unref:
+	g_main_loop_unref(mainloop);
+out_udev_mon_unref:
+	udev_monitor_unref(uevent_monitor);
+out_udev_unref:
+	udev_unref(u);
+out_close:
+	drmClose(fd);
+out:
+	return ret;
+}