183 lines
4.3 KiB
C
183 lines
4.3 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* Copyright (C) 2014 The Linux Foundation. All rights reserved.
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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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// #define LOG_NDEBUG 0
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#include <cutils/log.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <pthread.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <hardware/lights.h>
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/******************************************************************************/
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static pthread_once_t g_init = PTHREAD_ONCE_INIT;
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static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
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char const *const LCD_FILE
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= "/sys/class/leds/lcd-backlight/brightness";
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char const *const BUTTON_FILE
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= "/sys/class/sec/sec_touchkey/brightness";
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/**
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* device methods
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*/
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void init_globals(void)
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{
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// init the mutex
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pthread_mutex_init(&g_lock, NULL);
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}
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static int
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write_int(char const* path, int value)
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{
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int fd;
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static int already_warned = 0;
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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 = snprintf(buffer, sizeof(buffer), "%d\n", value);
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ssize_t amt = write(fd, buffer, (size_t)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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static int
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rgb_to_brightness(struct light_state_t const* state)
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{
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int color = state->color & 0x00ffffff;
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return ((77*((color>>16)&0x00ff))
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+ (150*((color>>8)&0x00ff)) + (29*(color&0x00ff))) >> 8;
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}
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static int
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set_light_backlight(struct light_device_t* dev,
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struct light_state_t const* state)
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{
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int err = 0;
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int brightness = rgb_to_brightness(state);
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if (!dev) {
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return -1;
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}
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pthread_mutex_lock(&g_lock);
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err = write_int(LCD_FILE, brightness);
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pthread_mutex_unlock(&g_lock);
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return err;
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}
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static int
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set_light_buttons(struct light_device_t* dev,
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struct light_state_t const* state)
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{
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int err = 0;
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int on = (state->color & 0xFF);
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if (!dev) {
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return -1;
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}
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pthread_mutex_lock(&g_lock);
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err = write_int(BUTTON_FILE, on == 255 ? 1 : 0);
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pthread_mutex_unlock(&g_lock);
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return err;
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}
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/** Close the lights device */
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static int
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close_lights(struct light_device_t *dev)
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{
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if (dev) {
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free(dev);
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}
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return 0;
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}
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/******************************************************************************/
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/**
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* module methods
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*/
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/** Open a new instance of a lights device using name */
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static int open_lights(const struct hw_module_t* module, char const* name,
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struct hw_device_t** device)
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{
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int (*set_light)(struct light_device_t* dev,
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struct light_state_t const* state);
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if (0 == strcmp(LIGHT_ID_BACKLIGHT, name))
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set_light = set_light_backlight;
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else if (0 == strcmp(LIGHT_ID_BUTTONS, name))
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set_light = set_light_buttons;
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else
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return -EINVAL;
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pthread_once(&g_init, init_globals);
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struct light_device_t *dev = malloc(sizeof(struct light_device_t));
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if (!dev)
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return -ENOMEM;
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memset(dev, 0, sizeof(*dev));
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dev->common.tag = HARDWARE_DEVICE_TAG;
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dev->common.version = 0;
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dev->common.module = (struct hw_module_t*)module;
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dev->common.close = (int (*)(struct hw_device_t*))close_lights;
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dev->set_light = set_light;
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*device = (struct hw_device_t*)dev;
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return 0;
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}
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static struct hw_module_methods_t lights_module_methods = {
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.open = open_lights,
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};
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/*
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* The lights Module
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*/
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struct hw_module_t HAL_MODULE_INFO_SYM = {
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.tag = HARDWARE_MODULE_TAG,
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.version_major = 1,
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.version_minor = 0,
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.id = LIGHTS_HARDWARE_MODULE_ID,
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.name = "lights Module",
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.author = "Google, Inc.",
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.methods = &lights_module_methods,
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};
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