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
write_int(char const * path,int value)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
rgb_to_brightness(struct light_state_t const * state)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
set_light_backlight(struct light_device_t * dev,struct light_state_t const * state)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 */
close_lights(struct light_device_t * dev)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 */
open_lights(const struct hw_module_t * module,char const * name,struct hw_device_t ** device)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