Emulating devices is important for debugging when the hardware isn't
present. udev doesn't apply the same settings to emulated uinput devices as
it does to real devices, so we need to guess.
To allow some flexibility, use an UINPUT_ namespace and check that. Custom
udev rules may then set the UINPUT_SUBSYSTEM for an emulated device.
Signed-off-by: Peter Hutterer <peter.hutte...@who-t.net>
---
libwacom/libwacom.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/libwacom/libwacom.c b/libwacom/libwacom.c
index 103f942..93695cb 100644
--- a/libwacom/libwacom.c
+++ b/libwacom/libwacom.c
@@ -47,6 +47,34 @@ is_tablet_or_touchpad (GUdevDevice *device)
g_udev_device_get_property_as_boolean (device,
"ID_INPUT_TOUCHPAD");
}
+/* Overriding SUBSYSTEM isn't allowed in udev (works sometimes, but not
+ * always). For evemu devices we need to set custom properties to make them
+ * detected by libwacom.
+ */
+static char *
+get_uinput_subsystem (GUdevDevice *device)
+{
+ const char *bus_str;
+ GUdevDevice *parent;
+
+
+ bus_str = NULL;
+ parent = g_object_ref (device);
+
+ while (parent && !g_udev_device_get_property_as_boolean (parent,
"UINPUT_DEVICE")) {
+ GUdevDevice *old_parent = parent;
+ parent = g_udev_device_get_parent (old_parent);
+ g_object_unref (old_parent);
+ }
+
+ if (parent) {
+ bus_str = g_udev_device_get_property (parent,
"UINPUT_SUBSYSTEM");
+ g_object_unref (parent);
+ }
+
+ return bus_str ? g_strdup (bus_str) : NULL;
+}
+
static char *
get_bus (GUdevDevice *device)
{
@@ -54,6 +82,10 @@ get_bus (GUdevDevice *device)
char *bus_str;
GUdevDevice *parent;
+ bus_str = get_uinput_subsystem (device);
+ if (bus_str)
+ return bus_str;
+
subsystem = g_udev_device_get_subsystem (device);
parent = g_object_ref (device);
--
1.7.10.1
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