kms: add uevent support.

When we get a hotplug event from the kernel we should notify the client side to reconfigure displays.

based on work by ajax in intel driver.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index 399a6a73..cadd1763 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -1159,6 +1159,7 @@ Bool drmmode_pre_init(ScrnInfoPtr pScrn, drmmode_ptr drmmode, int cpp)
 	xf86CrtcConfigInit(pScrn, &drmmode_xf86crtc_config_funcs);
 	xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
 
+	drmmode->scrn = pScrn;
 	drmmode->cpp = cpp;
 	drmmode->mode_res = drmModeGetResources(drmmode->fd);
 	if (!drmmode->mode_res)
@@ -1347,4 +1348,67 @@ Bool drmmode_setup_colormap(ScreenPtr pScreen, ScrnInfoPtr pScrn)
          return FALSE;
     return TRUE;
 }
+
+#ifdef HAVE_LIBUDEV
+static void
+drmmode_handle_uevents(int fd, void *closure)
+{
+	drmmode_ptr drmmode = closure;
+	ScrnInfoPtr scrn = drmmode->scrn;
+	struct udev_device *dev;
+	dev = udev_monitor_receive_device(drmmode->uevent_monitor);
+	if (!dev)
+		return;
+
+	RRGetInfo(screenInfo.screens[scrn->scrnIndex], TRUE);
+	udev_device_unref(dev);
+}
+#endif
+
+void drmmode_uevent_init(ScrnInfoPtr scrn, drmmode_ptr drmmode)
+{
+#ifdef HAVE_LIBUDEV
+	struct udev *u;
+	struct udev_monitor *mon;
+
+	u = udev_new();
+	if (!u)
+		return;
+	mon = udev_monitor_new_from_netlink(u, "udev");
+	if (!mon) {
+		udev_unref(u);
+		return;
+	}
+
+	if (udev_monitor_filter_add_match_subsystem_devtype(mon,
+							    "drm",
+							    "drm_minor") < 0 ||
+	    udev_monitor_enable_receiving(mon) < 0) {
+		udev_monitor_unref(mon);
+		udev_unref(u);
+		return;
+	}
+
+	drmmode->uevent_handler =
+		xf86AddGeneralHandler(udev_monitor_get_fd(mon),
+				      drmmode_handle_uevents,
+				      drmmode);
+
+	drmmode->uevent_monitor = mon;
+#endif
+}
+
+void drmmode_uevent_fini(ScrnInfoPtr scrn, drmmode_ptr drmmode)
+{
+#ifdef HAVE_LIBUDEV
+	if (drmmode->uevent_handler) {
+		struct udev *u = udev_monitor_get_udev(drmmode->uevent_monitor);
+		xf86RemoveGeneralHandler(drmmode->uevent_handler);
+
+		udev_monitor_unref(drmmode->uevent_monitor);
+		udev_unref(u);
+	}
+#endif
+}
+
 #endif