backend/libinput: rework switch interface

The wlr_libinput_input_device now owns its wlr_switch, instead of creating
a new wlr_libinput_input_device for it.

backend/libinput/backend.c

@@ -246,6 +246,9 @@ struct libinput_device *wlr_libinput_get_device_handle(
 	case WLR_INPUT_DEVICE_POINTER:
 		dev = device_from_pointer(wlr_dev->pointer);
 		break;
+	case WLR_INPUT_DEVICE_SWITCH:
+		dev = device_from_switch(wlr_dev->switch_device);
+		break;
 	default:
 		dev = (struct wlr_libinput_input_device *)wlr_dev;
 		break;

backend/libinput/events.c

@@ -43,6 +43,9 @@ void destroy_libinput_input_device(struct wlr_libinput_input_device *dev)
 		if (dev->pointer.impl) {
 			wlr_pointer_destroy(&dev->pointer);
 		}
+		if (dev->switch_device.impl) {
+			wlr_switch_destroy(&dev->switch_device);
+		}
 	}
 
 	libinput_device_unref(dev->handle);
@@ -140,6 +143,14 @@ static void handle_device_added(struct wlr_libinput_backend *backend,
 		dev_used = true;
 	}
 
+	if (libinput_device_has_capability(
+			libinput_dev, LIBINPUT_DEVICE_CAP_SWITCH)) {
+		init_device_switch(dev);
+		wlr_signal_emit_safe(&backend->backend.events.new_input,
+			&dev->switch_device.base);
+		dev_used = true;
+	}
+
 	if (dev_used) {
 		wl_list_insert(&backend->devices, &dev->link);
 		return;
@@ -201,20 +212,6 @@ static void handle_device_added(struct wlr_libinput_backend *backend,
 			libinput_dev, LIBINPUT_DEVICE_CAP_GESTURE)) {
 		// TODO
 	}
-	if (libinput_device_has_capability(
-			libinput_dev, LIBINPUT_DEVICE_CAP_SWITCH)) {
-		struct wlr_input_device *wlr_dev = allocate_device(backend,
-			libinput_dev, wlr_devices, WLR_INPUT_DEVICE_SWITCH);
-		if (!wlr_dev) {
-			goto fail;
-		}
-		wlr_dev->switch_device = create_libinput_switch(libinput_dev);
-		if (!wlr_dev->switch_device) {
-			free(wlr_dev);
-			goto fail;
-		}
-		wlr_signal_emit_safe(&backend->backend.events.new_input, wlr_dev);
-	}
 
 	if (!wl_list_empty(wlr_devices)) {
 		struct wl_list **dst = wl_array_add(&backend->wlr_device_lists, sizeof(wlr_devices));
@@ -343,7 +340,7 @@ void handle_libinput_event(struct wlr_libinput_backend *backend,
 		handle_tablet_pad_strip(event, libinput_dev);
 		break;
 	case LIBINPUT_EVENT_SWITCH_TOGGLE:
-		handle_switch_toggle(event, libinput_dev);
+		handle_switch_toggle(event, &dev->switch_device);
 		break;
 	case LIBINPUT_EVENT_GESTURE_SWIPE_BEGIN:
 		handle_pointer_swipe_begin(event, &dev->pointer);

backend/libinput/switch.c

@@ -1,43 +1,40 @@
 #include <assert.h>
 #include <libinput.h>
-#include <stdlib.h>
-#include <wlr/backend/session.h>
 #include <wlr/interfaces/wlr_switch.h>
-#include <wlr/types/wlr_input_device.h>
-#include <wlr/util/log.h>
 #include "backend/libinput.h"
 #include "util/signal.h"
 
-const struct wlr_switch_impl libinput_switch_impl;
+static void switch_destroy(struct wlr_switch *wlr_switch) {
+	/* wlr_switch belongs to the wlr_libinput_input_device */
+}
 
-struct wlr_switch *create_libinput_switch(
-		struct libinput_device *libinput_dev) {
-	assert(libinput_dev);
-	struct wlr_switch *wlr_switch = calloc(1, sizeof(struct wlr_switch));
-	if (!wlr_switch) {
-		wlr_log(WLR_ERROR, "Unable to allocate wlr_switch");
-		return NULL;
-	}
-	const char *name = libinput_device_get_name(libinput_dev);
+const struct wlr_switch_impl libinput_switch_impl = {
+	.destroy = switch_destroy,
+};
+
+void init_device_switch(struct wlr_libinput_input_device *dev) {
+	const char *name = libinput_device_get_name(dev->handle);
+	struct wlr_switch *wlr_switch = &dev->switch_device;
 	wlr_switch_init(wlr_switch, &libinput_switch_impl, name);
-	wlr_log(WLR_DEBUG, "Created switch for device %s", name);
-	wlr_switch->base.vendor = libinput_device_get_id_vendor(libinput_dev);
-	wlr_switch->base.product = libinput_device_get_id_product(libinput_dev);
-	return wlr_switch;
+	wlr_switch->base.vendor = libinput_device_get_id_vendor(dev->handle);
+	wlr_switch->base.product = libinput_device_get_id_product(dev->handle);
+}
+
+struct wlr_libinput_input_device *device_from_switch(
+		struct wlr_switch *wlr_switch) {
+	assert(wlr_switch->impl == &libinput_switch_impl);
+
+	struct wlr_libinput_input_device *dev =
+		wl_container_of(wlr_switch, dev, switch_device);
+	return dev;
 }
 
 void handle_switch_toggle(struct libinput_event *event,
-		struct libinput_device *libinput_dev) {
-	struct wlr_input_device *wlr_dev =
-		get_appropriate_device(WLR_INPUT_DEVICE_SWITCH, libinput_dev);
-	if (!wlr_dev) {
-		wlr_log(WLR_DEBUG, "Got a switch event for a device with no switch?");
-		return;
-	}
+		struct wlr_switch *wlr_switch) {
 	struct libinput_event_switch *sevent =
 		libinput_event_get_switch_event	(event);
 	struct wlr_event_switch_toggle wlr_event = { 0 };
-	wlr_event.device = wlr_dev;
+	wlr_event.device = &wlr_switch->base;
 	switch (libinput_event_switch_get_switch(sevent)) {
 	case LIBINPUT_SWITCH_LID:
 		wlr_event.switch_type = WLR_SWITCH_TYPE_LID;
@@ -56,5 +53,5 @@ void handle_switch_toggle(struct libinput_event *event,
 	}
 	wlr_event.time_msec =
 		usec_to_msec(libinput_event_switch_get_time_usec(sevent));
-	wlr_signal_emit_safe(&wlr_dev->switch_device->events.toggle, &wlr_event);
+	wlr_signal_emit_safe(&wlr_switch->events.toggle, &wlr_event);
 }

include/backend/libinput.h

@@ -36,6 +36,7 @@ struct wlr_libinput_input_device {
 
 	struct wlr_keyboard keyboard;
 	struct wlr_pointer pointer;
+	struct wlr_switch switch_device;
 
 	struct wl_list link;
 };
@@ -89,10 +90,11 @@ void handle_pointer_hold_begin(struct libinput_event *event,
 void handle_pointer_hold_end(struct libinput_event *event,
 	struct wlr_pointer *pointer);
 
-struct wlr_switch *create_libinput_switch(
-		struct libinput_device *device);
+void init_device_switch(struct wlr_libinput_input_device *dev);
+struct wlr_libinput_input_device *device_from_switch(
+	struct wlr_switch *switch_device);
 void handle_switch_toggle(struct libinput_event *event,
-		struct libinput_device *device);
+	struct wlr_switch *switch_device);
 
 struct wlr_touch *create_libinput_touch(
 		struct libinput_device *device);