1 files changed, 80 insertions, 0 deletions
diff --git a/tsutils/tsutils.c b/tsutils/tsutils.c
new file mode 100644
index 0000000..8a6d400
--- /dev/null
+++ b/tsutils/tsutils.c
@@ -0,0 +1,80 @@
+#include <dirent.h>
+#include <linux/input.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+
+#define LONG_BITS (sizeof(long) << 3)
+#define NUM_LONGS(bits) (((bits) + LONG_BITS - 1) / LONG_BITS)
+#define DEV_INPUT	"/dev/input"
+
+char tsInfo[200];
+
+static inline int testBit(long bit, const long *array) {
+    return (array[bit / LONG_BITS] >> bit % LONG_BITS) & 1;
+}
+
+char* getTouchScreenInfo() {
+	DIR* dir;
+    struct dirent* itemPtr;
+    int fd;
+    int isSingleTouch = 0, hasTouchScreen = 0;
+    long absbits[NUM_LONGS(ABS_CNT)];
+    char tsDevNode[100];
+    struct input_absinfo absInfo;
+
+	int maxX, maxY;
+
+	memset(tsDevNode, 0, sizeof(tsDevNode));
+	memset(tsInfo, 0, sizeof(tsInfo));
+
+	if ((dir = opendir(DEV_INPUT)) == NULL) {
+        printf("open %s failed.\n", DEV_INPUT);
+        return NULL;
+    }
+
+	while ((itemPtr = readdir(dir)) != NULL) {
+        //printf("name : %s---type : %d\n", itemPtr->d_name, itemPtr->d_type);
+        if ((strstr(itemPtr->d_name, "event") != NULL) && (2 == itemPtr->d_type)) {
+            sprintf(tsDevNode, "%s/%s", DEV_INPUT, itemPtr->d_name);
+            fd = open(tsDevNode, O_RDONLY);
+            if (fd < 0) {
+                printf("open %s failed.\n", tsDevNode);
+                return NULL;
+            }
+
+            if (ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbits)), absbits) >= 0) {
+                isSingleTouch = !testBit(ABS_MT_POSITION_X, absbits);
+            } else {
+                close(fd);
+                continue;
+            }
+
+            if (ioctl(fd, EVIOCGABS((isSingleTouch ? ABS_X : ABS_MT_POSITION_X)), &absInfo) >= 0) {
+                maxX = absInfo.maximum;
+            } else {
+                close(fd);
+                continue;
+            }
+
+            if (ioctl(fd, EVIOCGABS((isSingleTouch ? ABS_Y : ABS_MT_POSITION_Y)), &absInfo) >= 0) {
+                maxY = absInfo.maximum;
+            } else {
+                close(fd);
+                continue;
+            }
+
+            hasTouchScreen = 1;
+        	break;
+        }
+    }
+
+	if (!hasTouchScreen) return NULL;
+
+	sprintf(tsInfo, "%s %d %d", tsDevNode, maxX, maxY);
+
+	close(fd);
+	closedir(dir);
+	return tsInfo;
+}
+\ No newline at end of file