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review.blissroms.org / platform_hardware_samsung / fb7bd7cc79d0d9afd9d854536e18f5b51be770f1 / . / exynos4 / exynos4210 / liblightsbln / lights.c
blob: 6bfbbf4d58a7001a0fdcc8414807c50a8b9353dc [file] [log] [blame]
Arnab Chaudhuria958e7e2016-05-07 14:44:00 +0530[diff] [blame]1/*
2 * Copyright (C) 2012 The CyanogenMod 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
19#include <cutils/log.h>
20
21#include <stdint.h>
22#include <string.h>
23#include <unistd.h>
24#include <errno.h>
25#include <fcntl.h>
26
27#include <sys/ioctl.h>
28#include <sys/types.h>
29
30#include <hardware/lights.h>
31#include <hardware/hardware.h>
32
33static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
34
35/** Paths to light files **/
36char const *const BACKLIGHT_FILE = "/sys/class/backlight/panel/brightness";
37char const *const BUTTON_FILE = "/sys/class/sec/sec_touchkey/brightness";
38char const *const NOTIFICATION_FILE = "/sys/class/misc/backlightnotification/notification_led";
39
40/** Write integer to file **/
41static int write_int(char const *path, int value)
42{
43 int fd;
44 static int already_warned = -1;
45 fd = open(path, O_RDWR);
46 if (fd >= 0) {
47 char buffer[20];
48 int bytes = sprintf(buffer, "%d\n", value);
49 int amt = write(fd, buffer, bytes);
50 close(fd);
51 return amt == -1 ? -errno : 0;
52 } else {
53 if (already_warned == -1) {
54 ALOGE("write_int failed to open %s\n", path);
55 already_warned = 1;
56 }
57 return -errno;
58 }
59}
60
61/** Convert RGB to 0-255 integer **/
62static int rgb_to_brightness(struct light_state_t const *state)
63{
64 int color = state->color & 0x00ffffff;
65 return ((77 * ((color >> 16) & 0x00ff))
66 + (150 * ((color >> 8) & 0x00ff)) +
67 (29 * (color & 0x00ff))) >> 8;
68}
69
70/** Is light already enabled? **/
71static int is_lit(struct light_state_t const* state)
72{
73 return state->color & 0x00ffffff;
74}
75
76/** Set LCD backlight **/
77static int set_light_backlight(struct light_device_t *dev, struct light_state_t const *state)
78{
79 pthread_mutex_lock(&g_lock);
80 int err = write_int(BACKLIGHT_FILE, rgb_to_brightness(state));
81 pthread_mutex_unlock(&g_lock);
82 return err;
83}
84
85/** Set buttons backlight **/
86static int set_light_buttons(struct light_device_t* dev, struct light_state_t const* state)
87{
88 int err = 0;
89 pthread_mutex_lock (&g_lock);
90 if(is_lit(state))
91 err = write_int(BUTTON_FILE, 1);
92 else
93 err = write_int(BUTTON_FILE, 0);
94 pthread_mutex_unlock (&g_lock);
95 return err;
96}
97
98/** Set buttons backlight as BLN **/
99static int set_light_notifications(struct light_device_t* dev, struct light_state_t const* state)
100{
101 int err = 0;
102 pthread_mutex_lock (&g_lock);
103 if(is_lit(state))
104 err = write_int(NOTIFICATION_FILE, 1);
105 else
106 err = write_int(NOTIFICATION_FILE, 0);
107 pthread_mutex_unlock (&g_lock);
108 return err;
109}
110
111/** Close the lights device **/
112static int close_lights(struct light_device_t *dev)
113{
114 if (dev)
115 free(dev);
116 return 0;
117}
118
119/** Open a new instance of a lights device using name **/
120static int open_lights(const struct hw_module_t *module,
121 char const *name, struct hw_device_t **device)
122{
123 pthread_t lighting_poll_thread;
124
125 int (*set_light) (struct light_device_t *dev,
126 struct light_state_t const *state);
127
128 if (0 == strcmp(LIGHT_ID_BACKLIGHT, name))
129 set_light = set_light_backlight;
130 else if (0 == strcmp(LIGHT_ID_BUTTONS, name))
131 set_light = set_light_buttons;
132 else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
133 set_light = set_light_notifications;
134 else
135 return -EINVAL;
136
137 pthread_mutex_init(&g_lock, NULL);
138
139 struct light_device_t *dev = malloc(sizeof(struct light_device_t));
140 memset(dev, 0, sizeof(*dev));
141
142 dev->common.tag = HARDWARE_DEVICE_TAG;
143 dev->common.version = 0;
144 dev->common.module = (struct hw_module_t *)module;
145 dev->common.close = (int (*)(struct hw_device_t *))close_lights;
146 dev->set_light = set_light;
147
148 *device = (struct hw_device_t *)dev;
149
150 return 0;
151}
152
153/** Method list **/
154static struct hw_module_methods_t lights_methods =
155{
156 .open = open_lights,
157};
158
159/** The backlight module **/
160
161struct hw_module_t HAL_MODULE_INFO_SYM = {
162 .tag = HARDWARE_MODULE_TAG,
163 .version_major = 1,
164 .version_minor = 0,
165 .id = LIGHTS_HARDWARE_MODULE_ID,
166 .name = "Lights module",
167 .author = "The CyanogenMod Project",
168 .methods = &lights_methods,
169};