testdisplay: extract hotplug code

Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2026-08-20 12:52:55 +00:00 · 2012-01-24 10:50:05 +01:00
parent 137f4d467e
commit 7f7cafe729
4 changed files with 177 additions and 88 deletions
@@ -0,0 +1,121 @@
+/*
+ * 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.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <libudev.h>
+
+#include "testdisplay.h"
+
+static struct udev_monitor *uevent_monitor;
+static struct udev *udev;
+static GIOChannel *udevchannel;
+
+static gboolean hotplug_event(GIOChannel *source, GIOCondition condition,
+			      gpointer data)
+{
+	struct udev_device *dev;
+	dev_t udev_devnum;
+	struct stat s;
+	const char *hotplug;
+
+	dev = udev_monitor_receive_device(uevent_monitor);
+	if (!dev)
+		goto out;
+
+	udev_devnum = udev_device_get_devnum(dev);
+	fstat(drm_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;
+}
+
+
+gboolean testdisplay_setup_hotplug(void)
+{
+	int ret;
+
+	udev = udev_new();
+	if (!udev) {
+		fprintf(stderr, "failed to create udev object\n");
+		goto out;
+	}
+
+	uevent_monitor = udev_monitor_new_from_netlink(udev, "udev");
+	if (!uevent_monitor) {
+		fprintf(stderr, "failed to create udev event monitor\n");
+		goto out;
+	}
+
+	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;
+	}
+
+	ret = udev_monitor_enable_receiving(uevent_monitor);
+	if (ret < 0) {
+		fprintf(stderr, "failed to enable udev event reception\n");
+		goto out;
+	}
+
+	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;
+	}
+
+	ret = g_io_add_watch(udevchannel, G_IO_IN | G_IO_ERR, hotplug_event,
+			     udev);
+	if (ret < 0) {
+		fprintf(stderr, "failed to add watch on udev GIO channel\n");
+		goto out;
+	}
+
+	return TRUE;
+
+out:
+	testdisplay_cleanup_hotplug();
+	return FALSE;
+}
+
+void testdisplay_cleanup_hotplug(void)
+{
+	if (udevchannel)
+		g_io_channel_shutdown(udevchannel, TRUE, NULL);
+	if (uevent_monitor)
+		udev_monitor_unref(uevent_monitor);
+	if (udev)
+		udev_unref(udev);
+}