Abstract libwacom database initialization into a single place

No real changes for the non-tablet code, but for tablets we now keep the
libwacom datbase around. The primary motivating factor here is response time
during tests - initializing the database under valgrind took longer than the
proximity timeouts and caused random test case failures when a proximity out
was triggered before we even got to process the first event.

This is unfortunately a burden on the runtime now since we keep libwacom
around whenever a tablet is connected. Not much of an impact though, I
suspect, chances are you're running a web browser and everything pales against
that anyway.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

meson.build

@@ -215,7 +215,7 @@ src_libinput_util = [
 ]
 libinput_util = static_library('libinput-util',
 			       src_libinput_util,
-			       dependencies : [dep_udev, dep_libevdev],
+			       dependencies : [dep_udev, dep_libevdev, dep_libwacom],
 			       include_directories : includes_include)
 dep_libinput_util = declare_dependency(link_with : libinput_util)
 
@@ -233,7 +233,7 @@ src_libfilter = [
 		'src/filter-private.h'
 ]
 libfilter = static_library('filter', src_libfilter,
-			   dependencies : dep_udev,
+			   dependencies : [dep_udev, dep_libwacom],
 			   include_directories : includes_include)
 dep_libfilter = declare_dependency(link_with : libfilter)
 
@@ -290,7 +290,7 @@ src_libquirks = [
 	'src/builddir.h',
 ]
 
-deps_libquirks = [dep_udev, dep_libinput_util]
+deps_libquirks = [dep_udev, dep_libwacom, dep_libinput_util]
 libquirks = static_library('quirks', src_libquirks,
 			   dependencies : deps_libquirks,
 			   include_directories : includes_include)

src/evdev-mt-touchpad.c

@@ -3851,6 +3851,7 @@ tp_requires_rotation(struct tp_dispatch *tp, struct evdev_device *device)
 {
 	bool rotate = false;
 #if HAVE_LIBWACOM
+	struct libinput *li = tp_libinput_context(tp);
 	WacomDeviceDatabase *db = NULL;
 	WacomDevice **devices = NULL,
 		    **d;
@@ -3861,12 +3862,9 @@ tp_requires_rotation(struct tp_dispatch *tp, struct evdev_device *device)
 	if ((device->tags & EVDEV_TAG_TABLET_TOUCHPAD) == 0)
 		goto out;
 
-	db = libwacom_database_new();
-	if (!db) {
-		evdev_log_info(device,
-			       "Failed to initialize libwacom context.\n");
+	db = libinput_libwacom_ref(li);
+	if (!db)
 		goto out;
-	}
 
 	/* Check if we have a device with the same vid/pid. If not,
 	   we need to loop through all devices and check their paired
@@ -3896,9 +3894,12 @@ tp_requires_rotation(struct tp_dispatch *tp, struct evdev_device *device)
 	}
 
 	free(devices);
+
 out:
+	/* We don't need to keep it around for the touchpad, we're done with
+	 * it until the device dies. */
 	if (db)
-		libwacom_database_destroy(db);
+		libinput_libwacom_unref(li);
 #endif
 
 	return rotate;

src/evdev-tablet-pad-leds.c

@@ -490,16 +490,14 @@ static int
 pad_init_leds_from_libwacom(struct pad_dispatch *pad,
 			    struct evdev_device *device)
 {
+	struct libinput *li = pad_libinput_context(pad);
 	WacomDeviceDatabase *db = NULL;
 	WacomDevice *wacom = NULL;
 	int rc = 1;
 
-	db = libwacom_database_new();
-	if (!db) {
-		evdev_log_info(device,
-			       "Failed to initialize libwacom context.\n");
+	db = libinput_libwacom_ref(li);
+	if (!db)
 		goto out;
-	}
 
 	wacom = libwacom_new_from_path(db,
 				       udev_device_get_devnode(device->udev_device),
@@ -522,7 +520,7 @@ out:
 	if (wacom)
 		libwacom_destroy(wacom);
 	if (db)
-		libwacom_database_destroy(db);
+		libinput_libwacom_unref(li);
 
 	if (rc != 0)
 		pad_destroy_leds(pad);

src/evdev-tablet-pad.c

@@ -529,17 +529,15 @@ pad_init_buttons_from_libwacom(struct pad_dispatch *pad,
 {
 	bool rc = false;
 #if HAVE_LIBWACOM_GET_BUTTON_EVDEV_CODE
+	struct libinput *li = pad_libinput_context(pad);
 	WacomDeviceDatabase *db = NULL;
 	WacomDevice *tablet = NULL;
 	int num_buttons;
 	int map = 0;
 
-	db = libwacom_database_new();
-	if (!db) {
-		evdev_log_info(device,
-			       "Failed to initialize libwacom context.\n");
+	db = libinput_libwacom_ref(li);
+	if (!db)
 		goto out;
-	}
 
 	tablet = libwacom_new_from_usbid(db,
 					 evdev_device_get_id_vendor(device),
@@ -566,7 +564,7 @@ out:
 	if (tablet)
 		libwacom_destroy(tablet);
 	if (db)
-		libwacom_database_destroy(db);
+		libinput_libwacom_unref(li);
 #endif
 	return rc;
 }

src/evdev-tablet.c

@@ -913,15 +913,13 @@ tool_set_bits_from_libwacom(const struct tablet_dispatch *tablet,
 	WacomStylusType type;
 	WacomAxisTypeFlags axes;
 
-	db = libwacom_database_new();
-	if (!db) {
-		evdev_log_info(tablet->device,
-			       "Failed to initialize libwacom context.\n");
-		goto out;
-	}
+	db = tablet_libinput_context(tablet)->libwacom.db;
+	if (!db)
+		return rc;
+
 	s = libwacom_stylus_get_for_id(db, tool->tool_id);
 	if (!s)
-		goto out;
+		return rc;
 
 	type = libwacom_stylus_get_type(s);
 	if (type == WSTYLUS_PUCK) {
@@ -965,9 +963,6 @@ tool_set_bits_from_libwacom(const struct tablet_dispatch *tablet,
 		copy_axis_cap(tablet, tool, LIBINPUT_TABLET_TOOL_AXIS_PRESSURE);
 
 	rc = 0;
-out:
-	if (db)
-		libwacom_database_destroy(db);
 #endif
 	return rc;
 }
@@ -1990,6 +1985,7 @@ tablet_destroy(struct evdev_dispatch *dispatch)
 {
 	struct tablet_dispatch *tablet = tablet_dispatch(dispatch);
 	struct libinput_tablet_tool *tool, *tmp;
+	struct libinput *li = tablet_libinput_context(tablet);
 
 	libinput_timer_cancel(&tablet->quirks.prox_out_timer);
 	libinput_timer_destroy(&tablet->quirks.prox_out_timer);
@@ -1998,6 +1994,8 @@ tablet_destroy(struct evdev_dispatch *dispatch)
 		libinput_tablet_tool_unref(tool);
 	}
 
+	libinput_libwacom_unref(li);
+
 	free(tablet);
 }
 
@@ -2317,6 +2315,9 @@ struct evdev_dispatch *
 evdev_tablet_create(struct evdev_device *device)
 {
 	struct tablet_dispatch *tablet;
+	struct libinput *li = evdev_libinput_context(device);
+
+	libinput_libwacom_ref(li);
 
 	/* Stop false positives caused by the forced proximity code */
 	if (getenv("LIBINPUT_RUNNING_TEST_SUITE"))

src/evdev.c

@@ -2700,17 +2700,15 @@ evdev_tablet_has_left_handed(struct evdev_device *device)
 {
 	bool has_left_handed = false;
 #if HAVE_LIBWACOM
-	WacomDeviceDatabase *db;
+	struct libinput *li = evdev_libinput_context(device);
+	WacomDeviceDatabase *db = NULL;
 	WacomDevice *d = NULL;
 	WacomError *error;
 	const char *devnode;
 
-	db = libwacom_database_new();
-	if (!db) {
-		evdev_log_info(device,
-			       "failed to initialize libwacom context.\n");
+	db = libinput_libwacom_ref(li);
+	if (!db)
 		goto out;
-	}
 
 	error = libwacom_error_new();
 	devnode = udev_device_get_devnode(device->udev_device);
@@ -2737,7 +2735,8 @@ evdev_tablet_has_left_handed(struct evdev_device *device)
 		libwacom_error_free(&error);
 	if (d)
 		libwacom_destroy(d);
-	libwacom_database_destroy(db);
+	if (db)
+		libinput_libwacom_unref(li);
 
 out:
 #endif

src/libinput-private.h

@@ -31,6 +31,10 @@
 #include <math.h>
 #include <stdarg.h>
 
+#if HAVE_LIBWACOM
+#include <libwacom/libwacom.h>
+#endif
+
 #include "linux/input.h"
 
 #include "libinput.h"
@@ -155,6 +159,13 @@ struct libinput {
 
 	bool quirks_initialized;
 	struct quirks_context *quirks;
+
+#if HAVE_LIBWACOM
+	struct {
+		WacomDeviceDatabase *db;
+		size_t refcount;
+	} libwacom;
+#endif
 };
 
 typedef void (*libinput_seat_destroy_func) (struct libinput_seat *seat);
@@ -837,4 +848,15 @@ point_in_rect(const struct device_coords *point,
 		point->y < rect->y + rect->h);
 }
 
+#if HAVE_LIBWACOM
+WacomDeviceDatabase *
+libinput_libwacom_ref(struct libinput *li);
+void
+libinput_libwacom_unref(struct libinput *li);
+#else
+static inline void *libinput_libwacom_ref(struct libinput *li) { return NULL; }
+static inline void libinput_libwacom_unref(struct libinput *li) {}
+#endif
+
+
 #endif /* LIBINPUT_PRIVATE_H */

src/libinput.c

@@ -4164,3 +4164,37 @@ libinput_device_config_rotation_get_default_angle(struct libinput_device *device
 
 	return device->config.rotation->get_default_angle(device);
 }
+
+#if HAVE_LIBWACOM
+WacomDeviceDatabase *
+libinput_libwacom_ref(struct libinput *li)
+{
+	WacomDeviceDatabase *db = NULL;
+	if (!li->libwacom.db) {
+		db = libwacom_database_new();
+		if (!db) {
+			log_error(li,
+				  "Failed to initialize libwacom context\n");
+			return NULL;
+		}
+
+		li->libwacom.db = db;
+		li->libwacom.refcount = 0;
+	}
+
+	li->libwacom.refcount++;
+	db = li->libwacom.db;
+	return db;
+}
+
+void
+libinput_libwacom_unref(struct libinput *li)
+{
+	assert(li->libwacom.refcount >= 1);
+
+	if (--li->libwacom.refcount == 0) {
+		libwacom_database_destroy(li->libwacom.db);
+		li->libwacom.db = NULL;
+	}
+}
+#endif