As discussed on the mailing list, replace the cryptic hex values with
bit shifts from linux/input.h (if available, adds a check to
configure.ac for that as well).
>From 6083b1e619d35d98ba5339baeef50ffb1590a957 Mon Sep 17 00:00:00 2001
From: Olivier Fourdan <ofour...@redhat.com>
Date: Thu, 11 Oct 2012 10:32:10 +0200
Subject: [PATCH] lib: use kernel flags if available
to identify screen tablets if not set in the database.
To properly ensure that you're getting a touchscreen,
check DIRECT flag is set but not POINTER.
Signed-off-by: Olivier Fourdan <ofour...@redhat.com>
---
configure.ac | 1 +
libwacom/libwacom.c | 20 +++++++++++++++++---
2 files changed, 18 insertions(+), 3 deletions(-)
diff --git a/configure.ac b/configure.ac
index 432f0e7..64571ef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -32,6 +32,7 @@ AC_CHECK_PROG(HAVE_DOXYGEN, [doxygen], [yes], [no])
AM_CONDITIONAL(HAVE_DOXYGEN, test "x$HAVE_DOXYGEN" = xyes)
PKG_CHECK_MODULES(GLIB, glib-2.0 gudev-1.0)
+AC_CHECK_HEADERS(linux/input.h)
AC_CONFIG_FILES([Makefile
data/Makefile
diff --git a/libwacom/libwacom.c b/libwacom/libwacom.c
index fe850a2..e380d83 100644
--- a/libwacom/libwacom.c
+++ b/libwacom/libwacom.c
@@ -34,6 +34,19 @@
#include <string.h>
#include <gudev/gudev.h>
+#ifdef HAVE_LINUX_INPUT_H
+#include <linux/input.h>
+#endif
+
+/* Defined in linux/input.h but older versions may be missing these definitions */
+#ifndef INPUT_PROP_POINTER
+#define INPUT_PROP_POINTER 0x00 /* needs a pointer */
+#endif
+
+#ifndef INPUT_PROP_DIRECT
+#define INPUT_PROP_DIRECT 0x01 /* direct input devices */
+#endif
+
static const WacomDevice *
libwacom_get_device(WacomDeviceDatabase *db, const char *match)
{
@@ -162,11 +175,12 @@ get_device_info (const char *path,
sysfs_path = g_build_filename ("/sys/class/input", devname, "device/properties", NULL);
if (g_file_get_contents (sysfs_path, &contents, NULL, NULL)) {
int flag;
+ int direct_flag = (1 << INPUT_PROP_DIRECT);
+ int pointer_flag = (1 << INPUT_PROP_POINTER);
- /* 0x01: POINTER flag
- * 0x02: DIRECT flag */
flag = atoi(contents);
- *builtin = (flag & 0x02) == 0x02 ? IS_BUILTIN_TRUE : IS_BUILTIN_FALSE;
+ *builtin = (flag & (direct_flag | pointer_flag) == direct_flag)
+ ? IS_BUILTIN_TRUE : IS_BUILTIN_FALSE;
g_free (contents);
}
g_free (sysfs_path);
--
1.7.1
------------------------------------------------------------------------------
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