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Diffstat (limited to '')
| -rw-r--r-- | wear_touch.cpp | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/wear_touch.cpp b/wear_touch.cpp new file mode 100644 index 000000000..f22d40b88 --- /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; +} + |