/*
 * Copyright (c) 2015 The CyanogenMod 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 <errno.h>
#include <string.h>
#include <fcntl.h>
#include <hardware/power.h>

#define LOG_TAG "PowerHAL"
#include <utils/Log.h>

struct local_power_module {
    struct power_module base;
};

#define BUF_SIZE 80

static void sysfs_write(const char *path, const char *const s) {
    char buf[BUF_SIZE];
    int len;
    int fd = open(path, O_WRONLY);

    if (fd < 0) {
        strerror_r(errno, buf, sizeof(buf));
        ALOGE("Error opening %s: %s\n", path, buf);
        return;
    }

    len = write(fd, s, strlen(s));
    if (len < 0) {
        strerror_r(errno, buf, sizeof(buf));
        ALOGE("Error writing to %s: %s\n", path, buf);
    }

    close(fd);
}

static void power_init(struct power_module *) {
}

static void power_set_interactive(struct power_module *, int on __unused) {
}

static void power_hint(struct power_module *module __unused, power_hint_t hint __unused, void *data __unused) {
}

static struct hw_module_methods_t power_module_methods = {
    .open = NULL,
};

void set_feature(struct power_module *module __unused, feature_t feature, int state)
{
    char tmp_str[BUF_SIZE];
#ifdef TAP_TO_WAKE_NODE
    if (feature == POWER_FEATURE_DOUBLE_TAP_TO_WAKE) {
        snprintf(tmp_str, BUF_SIZE, "%d", state);
        sysfs_write(TAP_TO_WAKE_NODE, tmp_str);
    }
#endif
}

struct local_power_module HAL_MODULE_INFO_SYM = {
    .base = {
       .common = {
            .tag = HARDWARE_MODULE_TAG,
            .module_api_version = POWER_MODULE_API_VERSION_0_3,
            .hal_api_version = HARDWARE_HAL_API_VERSION,
            .id = POWER_HARDWARE_MODULE_ID,
            .name = "Mofd_v1 Power HAL",
            .author = "The CyanogenMod Project",
            .methods = &power_module_methods,
            .dso = 0,
            .reserved = {0},
        },
        .init = power_init,
        .setInteractive = power_set_interactive,
        .powerHint = power_hint,
        .setFeature = set_feature,
        .getFeature = 0,
    },
};