evdev: hook up a generic enable/disable interface for devices

The evdev fallback dispatch supports enabling and disabling devices. That's
fairly easy to support since we don't (yet) have extra event generation within
the fallback backend. Thus, we can simply close the fd and re-open it again
later.

Touchpads are currently excluded here, they generate extra events on tapping,
scrolling, and software buttons and need a more complex implementation.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

src/evdev.c

@@ -624,14 +624,63 @@ struct evdev_dispatch_interface fallback_interface = {
 	fallback_destroy
 };
 
+static uint32_t
+evdev_sendevents_get_modes(struct libinput_device *device)
+{
+	return LIBINPUT_CONFIG_SEND_EVENTS_ENABLED |
+	       LIBINPUT_CONFIG_SEND_EVENTS_DISABLED;
+}
+
+static enum libinput_config_status
+evdev_sendevents_set_mode(struct libinput_device *device,
+			  enum libinput_config_send_events_mode mode)
+{
+	struct evdev_device *evdev = (struct evdev_device*)device;
+	struct evdev_dispatch *dispatch = evdev->dispatch;
+
+	if (mode == dispatch->sendevents.current_mode)
+		return LIBINPUT_CONFIG_STATUS_SUCCESS;
+
+	switch(mode) {
+	case LIBINPUT_CONFIG_SEND_EVENTS_ENABLED:
+		evdev_device_resume(evdev);
+		break;
+	case LIBINPUT_CONFIG_SEND_EVENTS_DISABLED:
+		evdev_device_suspend(evdev);
+		break;
+	default:
+		return LIBINPUT_CONFIG_STATUS_UNSUPPORTED;
+	}
+
+	dispatch->sendevents.current_mode = mode;
+
+	return LIBINPUT_CONFIG_STATUS_SUCCESS;
+}
+
+static enum libinput_config_send_events_mode
+evdev_sendevents_get_mode(struct libinput_device *device)
+{
+	struct evdev_device *evdev = (struct evdev_device*)device;
+	struct evdev_dispatch *dispatch = evdev->dispatch;
+
+	return dispatch->sendevents.current_mode;
+}
+
+static enum libinput_config_send_events_mode
+evdev_sendevents_get_default_mode(struct libinput_device *device)
+{
+	return LIBINPUT_CONFIG_SEND_EVENTS_ENABLED;
+}
+
 static struct evdev_dispatch *
 fallback_dispatch_create(struct libinput_device *device)
 {
-	struct evdev_dispatch *dispatch = malloc(sizeof *dispatch);
+	struct evdev_dispatch *dispatch = zalloc(sizeof *dispatch);
 	if (dispatch == NULL)
 		return NULL;
 
 	dispatch->interface = &fallback_interface;
+
 	device->config.calibration = &dispatch->calibration;
 
 	dispatch->calibration.has_matrix = evdev_calibration_has_matrix;
@@ -639,6 +688,14 @@ fallback_dispatch_create(struct libinput_device *device)
 	dispatch->calibration.get_matrix = evdev_calibration_get_matrix;
 	dispatch->calibration.get_default_matrix = evdev_calibration_get_default_matrix;
 
+	device->config.sendevents = &dispatch->sendevents.config;
+
+	dispatch->sendevents.current_mode = LIBINPUT_CONFIG_SEND_EVENTS_ENABLED;
+	dispatch->sendevents.config.get_modes = evdev_sendevents_get_modes;
+	dispatch->sendevents.config.set_mode = evdev_sendevents_set_mode;
+	dispatch->sendevents.config.get_mode = evdev_sendevents_get_mode;
+	dispatch->sendevents.config.get_default_mode = evdev_sendevents_get_default_mode;
+
 	return dispatch;
 }
 
@@ -1198,6 +1255,40 @@ evdev_device_suspend(struct evdev_device *device)
 	return 0;
 }
 
+int
+evdev_device_resume(struct evdev_device *device)
+{
+	struct libinput *libinput = device->base.seat->libinput;
+	int fd;
+
+	if (device->fd != -1)
+		return 0;
+
+	fd = open_restricted(libinput, device->devnode, O_RDWR | O_NONBLOCK);
+
+	if (fd < 0)
+		return -errno;
+
+	device->fd = fd;
+
+	if (evdev_need_mtdev(device)) {
+		device->mtdev = mtdev_new_open(device->fd);
+		if (!device->mtdev)
+			return -ENODEV;
+	}
+
+	device->source =
+		libinput_add_fd(libinput, fd, evdev_device_dispatch, device);
+	if (!device->source) {
+		mtdev_close_delete(device->mtdev);
+		return -ENOMEM;
+	}
+
+	memset(device->hw_key_mask, 0, sizeof(device->hw_key_mask));
+
+	return 0;
+}
+
 void
 evdev_device_remove(struct evdev_device *device)
 {

src/evdev.h

@@ -124,6 +124,11 @@ struct evdev_dispatch_interface {
 struct evdev_dispatch {
 	struct evdev_dispatch_interface *interface;
 	struct libinput_device_config_calibration calibration;
+
+	struct {
+		struct libinput_device_config_send_events config;
+		enum libinput_config_send_events_mode current_mode;
+	} sendevents;
 };
 
 struct evdev_device *
@@ -189,6 +194,9 @@ evdev_device_transform_y(struct evdev_device *device,
 int
 evdev_device_suspend(struct evdev_device *device);
 
+int
+evdev_device_resume(struct evdev_device *device);
+
 void
 evdev_keyboard_notify_key(struct evdev_device *device,
 			  uint32_t time,