recovery: Move SwipeDetector into common location
The SwipeDetector class is used almost unchanged in all locations.
This patch moves it into the recovery module, from which devices can
reference it if required.
The class is now renamed to WearSwipeDetector.
Bug: 27407422
Change-Id: Ifd3c7069a287548b89b14ab5d6d2b90a298e0145
diff --git a/Android.mk b/Android.mk
index 4477fef..5b488ca 100644
--- a/Android.mk
+++ b/Android.mk
@@ -41,6 +41,7 @@
ui.cpp \
verifier.cpp \
wear_ui.cpp \
+ wear_touch.cpp \
LOCAL_MODULE := recovery
diff --git a/wear_touch.cpp b/wear_touch.cpp
new file mode 100644
index 0000000..f22d40b
--- /dev/null
+++ b/wear_touch.cpp
@@ -0,0 +1,177 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "common.h"
+#include "wear_touch.h"
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+#include <linux/input.h>
+
+#define DEVICE_PATH "/dev/input"
+
+WearSwipeDetector::WearSwipeDetector(int low, int high, OnSwipeCallback callback, void* cookie):
+ mLowThreshold(low),
+ mHighThreshold(high),
+ mCallback(callback),
+ mCookie(cookie),
+ mCurrentSlot(-1) {
+ pthread_create(&mThread, NULL, touch_thread, this);
+}
+
+WearSwipeDetector::~WearSwipeDetector() {
+}
+
+void WearSwipeDetector::detect(int dx, int dy) {
+ enum SwipeDirection direction;
+
+ if (abs(dy) < mLowThreshold && abs(dx) > mHighThreshold) {
+ direction = dx < 0 ? LEFT : RIGHT;
+ } else if (abs(dx) < mLowThreshold && abs(dy) > mHighThreshold) {
+ direction = dy < 0 ? UP : DOWN;
+ } else {
+ LOGD("Ignore %d %d\n", dx, dy);
+ return;
+ }
+
+ LOGD("Swipe direction=%d\n", direction);
+ mCallback(mCookie, direction);
+}
+
+void WearSwipeDetector::process(struct input_event *event) {
+ if (mCurrentSlot < 0) {
+ mCallback(mCookie, UP);
+ mCurrentSlot = 0;
+ }
+
+ if (event->type == EV_ABS) {
+ if (event->code == ABS_MT_SLOT)
+ mCurrentSlot = event->value;
+
+ // Ignore other fingers
+ if (mCurrentSlot > 0) {
+ return;
+ }
+
+ switch (event->code) {
+ case ABS_MT_POSITION_X:
+ mX = event->value;
+ mFingerDown = true;
+ break;
+
+ case ABS_MT_POSITION_Y:
+ mY = event->value;
+ mFingerDown = true;
+ break;
+
+ case ABS_MT_TRACKING_ID:
+ if (event->value < 0)
+ mFingerDown = false;
+ break;
+ }
+ } else if (event->type == EV_SYN) {
+ if (event->code == SYN_REPORT) {
+ if (mFingerDown && !mSwiping) {
+ mStartX = mX;
+ mStartY = mY;
+ mSwiping = true;
+ } else if (!mFingerDown && mSwiping) {
+ mSwiping = false;
+ detect(mX - mStartX, mY - mStartY);
+ }
+ }
+ }
+}
+
+void WearSwipeDetector::run() {
+ int fd = findDevice(DEVICE_PATH);
+ if (fd < 0) {
+ LOGE("no input devices found\n");
+ return;
+ }
+
+ struct input_event event;
+ while (read(fd, &event, sizeof(event)) == sizeof(event)) {
+ process(&event);
+ }
+
+ close(fd);
+}
+
+void* WearSwipeDetector::touch_thread(void* cookie) {
+ ((WearSwipeDetector*)cookie)->run();
+ return NULL;
+}
+
+#define test_bit(bit, array) (array[bit/8] & (1<<(bit%8)))
+
+int WearSwipeDetector::openDevice(const char *device) {
+ int fd = open(device, O_RDONLY);
+ if (fd < 0) {
+ LOGE("could not open %s, %s\n", device, strerror(errno));
+ return false;
+ }
+
+ char name[80];
+ name[sizeof(name) - 1] = '\0';
+ if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
+ LOGE("could not get device name for %s, %s\n", device, strerror(errno));
+ name[0] = '\0';
+ }
+
+ uint8_t bits[512];
+ memset(bits, 0, sizeof(bits));
+ int ret = ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(bits)), bits);
+ if (ret > 0) {
+ if (test_bit(ABS_MT_POSITION_X, bits) && test_bit(ABS_MT_POSITION_Y, bits)) {
+ LOGD("Found %s %s\n", device, name);
+ return fd;
+ }
+ }
+
+ close(fd);
+ return -1;
+}
+
+int WearSwipeDetector::findDevice(const char* path) {
+ DIR* dir = opendir(path);
+ if (dir == NULL) {
+ LOGE("Could not open directory %s", path);
+ return false;
+ }
+
+ struct dirent* entry;
+ int ret = -1;
+ while (ret < 0 && (entry = readdir(dir)) != NULL) {
+ if (entry->d_name[0] == '.') continue;
+
+ char device[PATH_MAX];
+ device[PATH_MAX-1] = '\0';
+ snprintf(device, PATH_MAX-1, "%s/%s", path, entry->d_name);
+
+ ret = openDevice(device);
+ }
+
+ closedir(dir);
+ return ret;
+}
+
diff --git a/wear_touch.h b/wear_touch.h
new file mode 100644
index 0000000..9a1d315
--- /dev/null
+++ b/wear_touch.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __WEAR_TOUCH_H
+#define __WEAR_TOUCH_H
+
+#include <pthread.h>
+
+class WearSwipeDetector {
+
+public:
+ enum SwipeDirection { UP, DOWN, RIGHT, LEFT };
+ typedef void (*OnSwipeCallback)(void* cookie, enum SwipeDirection direction);
+
+ WearSwipeDetector(int low, int high, OnSwipeCallback cb, void* cookie);
+ ~WearSwipeDetector();
+
+private:
+ void run();
+ void process(struct input_event *event);
+ void detect(int dx, int dy);
+
+ pthread_t mThread;
+ static void* touch_thread(void* cookie);
+
+ int findDevice(const char* path);
+ int openDevice(const char* device);
+
+ int mLowThreshold;
+ int mHighThreshold;
+
+ OnSwipeCallback mCallback;
+ void *mCookie;
+
+ int mX;
+ int mY;
+ int mStartX;
+ int mStartY;
+
+ int mCurrentSlot;
+ bool mFingerDown;
+ bool mSwiping;
+};
+
+#endif // __WEAR_TOUCH_H
