1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #define LOG_TAG "lights" 18 #define LOGE ALOGE 19 20 #include <cutils/log.h> 21 22 #include <stdint.h> 23 #include <string.h> 24 #include <unistd.h> 25 #include <errno.h> 26 #include <fcntl.h> 27 28 #include <sys/ioctl.h> 29 #include <sys/types.h> 30 31 #include <hardware/lights.h> 32 #include <hardware/hardware.h> 33 34 static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER; 35 36 static int write_int(char const *path, int value) 37 { 38 int fd; 39 static int already_warned = -1; 40 fd = open(path, O_RDWR); 41 if (fd >= 0) { 42 char buffer[20]; 43 int bytes = sprintf(buffer, "%d\n", value); 44 int amt = write(fd, buffer, bytes); 45 close(fd); 46 return amt == -1 ? -errno : 0; 47 } else { 48 if (already_warned == -1) { 49 LOGE("write_int failed to open %s\n", path); 50 already_warned = 1; 51 } 52 return -errno; 53 } 54 } 55 56 static int rgb_to_brightness(struct light_state_t const *state) 57 { 58 int color = state->color & 0x00ffffff; 59 return ((77 * ((color >> 16) & 0x00ff)) 60 + (150 * ((color >> 8) & 0x00ff)) + 61 (29 * (color & 0x00ff))) >> 8; 62 } 63 64 static int set_light_backlight(struct light_device_t *dev, 65 struct light_state_t const *state) 66 { 67 int err = 0; 68 int brightness = rgb_to_brightness(state); 69 //+++ power save 70 int range_num = 1; 71 int old_brightness_range_indexs[] = {160,255}; 72 int new_brightness_range_indexs[] = {160,182}; 73 int old_brightness = brightness; 74 int i=0; 75 int old_brightness_in_range = -1;// 0:1~10 , 1:10~102 , 2:102~255 76 for(i=0;i<range_num;i++){ 77 int t_range_min = old_brightness_range_indexs[i]; 78 int t_range_max = old_brightness_range_indexs[i+1]; 79 if( brightness>=t_range_min && brightness<=t_range_max){ 80 old_brightness_in_range = i; 81 break; 82 } 83 } 84 if(old_brightness_in_range>=0){ 85 int old_br_min = old_brightness_range_indexs[old_brightness_in_range]; 86 int olb_br_max = old_brightness_range_indexs[old_brightness_in_range+1]; 87 int new_br_min = new_brightness_range_indexs[old_brightness_in_range]; 88 int new_br_max = new_brightness_range_indexs[old_brightness_in_range+1]; 89 int new_brightness = new_br_min + 90 (new_br_max-new_br_min)*(old_brightness-old_br_min)/(olb_br_max-old_br_min); 91 brightness = new_brightness; 92 } 93 //--- 94 pthread_mutex_lock(&g_lock); 95 err = write_int("/sys/class/backlight/pwm-backlight/brightness", 96 brightness); 97 pthread_mutex_unlock(&g_lock); 98 99 return err; 100 } 101 102 /** Close the lights device */ 103 static int close_lights(struct light_device_t *dev) 104 { 105 if (dev) 106 free(dev); 107 return 0; 108 } 109 110 /** Open a new instance of a lights device using name */ 111 static int open_lights(const struct hw_module_t *module, char const *name, 112 struct hw_device_t **device) 113 { 114 pthread_t lighting_poll_thread; 115 116 int (*set_light) (struct light_device_t *dev, 117 struct light_state_t const *state); 118 119 if (0 == strcmp(LIGHT_ID_BACKLIGHT, name)) 120 set_light = set_light_backlight; 121 else 122 return -EINVAL; 123 124 pthread_mutex_init(&g_lock, NULL); 125 126 struct light_device_t *dev = malloc(sizeof(struct light_device_t)); 127 memset(dev, 0, sizeof(*dev)); 128 129 dev->common.tag = HARDWARE_DEVICE_TAG; 130 dev->common.version = 0; 131 dev->common.module = (struct hw_module_t *)module; 132 dev->common.close = (int (*)(struct hw_device_t *))close_lights; 133 dev->set_light = set_light; 134 135 *device = (struct hw_device_t *)dev; 136 137 return 0; 138 } 139 140 static struct hw_module_methods_t lights_methods = 141 { 142 .open = open_lights, 143 }; 144 145 /* 146 * The backlight Module 147 */ 148 struct hw_module_t HAL_MODULE_INFO_SYM = 149 { 150 .tag = HARDWARE_MODULE_TAG, 151 .version_major = 1, 152 .version_minor = 0, 153 .id = LIGHTS_HARDWARE_MODULE_ID, 154 .name = "NVIDIA Kai lights module", 155 .author = "NVIDIA", 156 .methods = &lights_methods, 157 }; 158
