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148 lines
3.4 KiB
148 lines
3.4 KiB
/*
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* Copyright (C) 2016 The CyanogenMod Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <cutils/log.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <liblights/samsung_lights_helper.h>
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/*
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* Reads an Integer from a file.
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*
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* @param path The absolute path string.
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* @return The Integer with decimal base, -1 on error.
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*/
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int read_int(char const *path)
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{
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int fd, len;
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int num_bytes = 10;
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char buf[11];
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int retval;
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fd = open(path, O_RDONLY);
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if (fd < 0) {
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ALOGE("%s: failed to open %s\n", __func__, path);
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goto fail;
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}
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len = read(fd, buf, num_bytes - 1);
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if (len < 0) {
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ALOGE("%s: failed to read from %s\n", __func__, path);
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goto fail;
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}
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buf[len] = '\0';
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close(fd);
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// no endptr, decimal base
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retval = strtol(buf, NULL, 10);
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return retval == 0 ? -1 : retval;
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fail:
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if (fd >= 0)
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close(fd);
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return -1;
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}
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/*
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* Writes an Integer to a file.
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*
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* @param path The absolute path string.
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* @param value The Integer value to be written.
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* @return 0 on success, -1 or errno on error.
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*/
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int write_int(char const *path, const int value)
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{
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int fd;
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static int already_warned;
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already_warned = 0;
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ALOGV("write_int: path %s, value %d", path, value);
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fd = open(path, O_RDWR);
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if (fd >= 0) {
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char buffer[20];
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int bytes = sprintf(buffer, "%d\n", value);
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int amt = write(fd, buffer, bytes);
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close(fd);
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return amt == -1 ? -errno : 0;
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} else {
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if (already_warned == 0) {
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ALOGE("write_int failed to open %s\n", path);
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already_warned = 1;
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}
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return -errno;
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}
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}
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/*
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* Set the current button brightness via sysfs.
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*
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* @param brightness The brightness value.
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* @return 0 on success, -1 or errno on error.
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*/
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inline int set_cur_button_brightness(const int brightness)
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{
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return write_int(BUTTON_BRIGHTNESS_NODE, brightness);
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}
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/*
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* Read the current panel brightness from sysfs.
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*
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* @return The brightness as Integer, -1 on error.
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*/
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inline int get_cur_panel_brightness()
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{
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return read_int(PANEL_BRIGHTNESS_NODE);
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}
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/*
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* Read the maximum panel brightness from sysfs.
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*
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* @return The brightness as Integer, -1 on error.
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*/
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inline int get_max_panel_brightness()
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{
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return read_int(PANEL_MAX_BRIGHTNESS_NODE);
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}
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/*
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* Set the current panel brightness via sysfs.
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*
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* @param brightness The (scaled) brightness value.
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* @return 0 on success, -1 or errno on error.
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*/
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inline int set_cur_panel_brightness(const int brightness)
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{
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return write_int(PANEL_BRIGHTNESS_NODE, brightness);
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}
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/*
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* Set the maximum panel brightness via sysfs.
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*
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* @param brightness The brightness value.
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* @return 0 on success, -1 or errno on error.
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*/
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inline int set_max_panel_brightness(const int brightness)
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{
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return write_int(PANEL_MAX_BRIGHTNESS_NODE, brightness);
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}
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