device_xiaomi_sm6150-common/power/power-feature.c

/*
 * Copyright (C) 2020 The LineageOS 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 <dirent.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>

#include "power-feature.h"

#include <hardware/power.h>
#include <linux/input.h>
#include <log/log.h>

int open_ts_input() {
    int fd = -1;
    DIR *dir = opendir("/dev/input");

    if (dir != NULL) {
        struct dirent *ent;

        while ((ent = readdir(dir)) != NULL) {
            if (ent->d_type == DT_CHR) {
                char absolute_path[PATH_MAX] = {0};
                char name[80] = {0};

                strcpy(absolute_path, "/dev/input/");
                strcat(absolute_path, ent->d_name);

                fd = open(absolute_path, O_RDWR);
                if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) > 0) {
                    if (strcmp(name, "goodix_ts") == 0)
                        break;
                }

                close(fd);
                fd = -1;
            }
        }

        closedir(dir);
    }

    return fd;
}

void set_device_specific_feature(feature_t feature, int state) {
    switch (feature) {
        case POWER_FEATURE_DOUBLE_TAP_TO_WAKE: {
            int fd = open_ts_input();
            if (fd == -1) {
                ALOGW("DT2W won't work because no supported touchscreen input devices were found");
                return;
            }
            struct input_event ev;
            ev.type = EV_SYN;
            ev.code = SYN_CONFIG;
            ev.value = state ? INPUT_EVENT_WAKUP_MODE_ON : INPUT_EVENT_WAKUP_MODE_OFF;
            write(fd, &ev, sizeof(ev));
            close(fd);
        }
    }
}