1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*
* Copyright (C) 2014-2015 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.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "lights"
#include <cutils/log.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <malloc.h>
#include <pthread.h>
#include <sys/types.h>
#include <hardware/lights.h>
#define UNUSED __attribute__((unused))
/******************************************************************************/
static pthread_once_t g_init = PTHREAD_ONCE_INIT;
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
static struct light_state_t g_notification;
static struct light_state_t g_buttons;
const char *const LCD_FILE
= "/sys/class/leds/lcd-backlight/brightness";
const char *const BUTTONS_FILE
= "/sys/class/leds/button-backlight/brightness";
/**
* device methods
*/
void init_globals(void)
{
// init the mutex
pthread_mutex_init(&g_lock, NULL);
}
static int
write_string(const char *path, const char *buffer)
{
int fd;
static int already_warned = 0;
fd = open(path, O_RDWR);
if (fd >= 0) {
int bytes = strlen(buffer);
int amt = write(fd, buffer, bytes);
close(fd);
return amt == -1 ? -errno : 0;
} else {
if (already_warned == 0) {
ALOGE("write_string failed to open %s (%s)\n", path, strerror(errno));
already_warned = 1;
}
return -errno;
}
}
static int
write_int(const char *path, int value)
{
char buffer[20];
sprintf(buffer, "%d\n", value);
return write_string(path, buffer);
}
static int
rgb_to_brightness(const struct light_state_t *state)
{
int color = state->color & 0x00ffffff;
return ((77 * ((color >> 16) & 0xff))
+ (150 * ((color >> 8) & 0xff))
+ (29 * (color & 0xff))) >> 8;
}
static int
is_lit(const struct light_state_t *state)
{
return (state->color & 0x00ffffff);
}
static int
set_light_backlight(UNUSED struct light_device_t *dev,
const struct light_state_t *state)
{
int err = 0;
int brightness = rgb_to_brightness(state);
bool is_display_on = (brightness > 0) ? true : false;
pthread_mutex_lock(&g_lock);
err = write_int(LCD_FILE, brightness);
pthread_mutex_unlock(&g_lock);
return err;
}
static int
set_light_buttons(UNUSED struct light_device_t *dev,
const struct light_state_t *state)
{
int err = 0;
int brightness = rgb_to_brightness(state);
pthread_mutex_lock(&g_lock);
g_buttons = *state;
g_buttons.color = brightness ? 0x00ffffff : 0;
if (brightness == 0 && rgb_to_brightness(&g_notification) > 0) {
brightness = rgb_to_brightness(&g_notification);
}
err = write_int(BUTTONS_FILE, brightness);
pthread_mutex_unlock(&g_lock);
return err;
}
static int
set_light_notifications(UNUSED struct light_device_t *dev,
const struct light_state_t *state)
{
int err = 0;
int brightness = rgb_to_brightness(state);
pthread_mutex_lock(&g_lock);
g_notification = *state;
g_notification.color = brightness ? 0x00ffffff : 0;
if (rgb_to_brightness(&g_buttons) == 0) {
err = write_int(BUTTONS_FILE, brightness);
}
pthread_mutex_unlock(&g_lock);
return 0;
}
/** Close the lights device */
static int
close_lights(struct light_device_t *dev)
{
if (dev) {
free(dev);
}
return 0;
}
/******************************************************************************/
/**
* module methods
*/
/** Open a new instance of a lights device using name */
static int open_lights(const struct hw_module_t *module, const char *name,
struct hw_device_t **device)
{
int (*set_light)(struct light_device_t *dev,
const struct light_state_t *state);
if (0 == strcmp(LIGHT_ID_BACKLIGHT, name))
set_light = set_light_backlight;
else if (0 == strcmp(LIGHT_ID_BUTTONS, name))
set_light = set_light_buttons;
else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
set_light = set_light_notifications;
else
return -EINVAL;
pthread_once(&g_init, init_globals);
struct light_device_t *dev = malloc(sizeof(struct light_device_t));
memset(dev, 0, sizeof(*dev));
dev->common.tag = HARDWARE_DEVICE_TAG;
dev->common.version = 0;
dev->common.module = (struct hw_module_t*)module;
dev->common.close = (int (*)(struct hw_device_t*))close_lights;
dev->set_light = set_light;
*device = (struct hw_device_t*)dev;
return 0;
}
static struct hw_module_methods_t lights_module_methods = {
.open = open_lights,
};
/*
* The lights Module
*/
struct hw_module_t HAL_MODULE_INFO_SYM = {
.tag = HARDWARE_MODULE_TAG,
.version_major = 1,
.version_minor = 0,
.id = LIGHTS_HARDWARE_MODULE_ID,
.name = "Trunk Lights Module",
.author = "The CyanogenMod Project",
.methods = &lights_module_methods,
};
|
