1 /*
2 * Copyright (C) 2008 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
19 #include <cutils/log.h>
20
21 #include <malloc.h>
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 char const* const MODE_RGB_FILE = "/sys/class/leds/indicator/ModeRGB";
36 char const* const BACKLIGHT_FILE = "/sys/class/backlight/tegra-dsi-backlight.0/brightness";
write_int(char const * path,int value)37 static int write_int(char const *path, int value)
38 {
39 int fd;
40 static int already_warned = -1;
41 fd = open(path, O_RDWR);
42 if (fd >= 0) {
43 char buffer[20];
44 int bytes = snprintf(buffer, 20, "%d\n", value);
45 int amt = write(fd, buffer, bytes);
46 close(fd);
47 return amt == -1 ? -errno : 0;
48 } else {
49 if (already_warned == -1) {
50 ALOGE("write_int failed to open %s\n", path);
51 already_warned = 1;
52 }
53 return -errno;
54 }
55 }
56
rgb_to_brightness(struct light_state_t const * state)57 static int rgb_to_brightness(struct light_state_t const *state)
58 {
59 int color = state->color & 0x00ffffff;
60 return ((77 * ((color >> 16) & 0x00ff))
61 + (150 * ((color >> 8) & 0x00ff)) +
62 (29 * (color & 0x00ff))) >> 8;
63 }
64
set_light_battery(struct light_device_t * dev,struct light_state_t const * state)65 static int set_light_battery(struct light_device_t* dev,
66 struct light_state_t const* state)
67 {
68 int err;
69 pthread_mutex_lock(&g_lock);
70 ALOGV("set_light_battery, flashMode:%x, color:%x", state->flashMode, state->color);
71 if(state->color)
72 err = write_int(MODE_RGB_FILE, 0x1ffffff);
73 else
74 err = write_int(MODE_RGB_FILE, 0x00);
75 pthread_mutex_unlock(&g_lock);
76 return err;
77 }
78
set_light_notifications(struct light_device_t * dev,struct light_state_t const * state)79 static int set_light_notifications(struct light_device_t* dev,
80 struct light_state_t const* state)
81 {
82 int err;
83 pthread_mutex_lock(&g_lock);
84 ALOGV("set_light_notifications, flashMode:%x, color:%x", state->flashMode, state->color);
85 if(state->flashMode)
86 err = write_int(MODE_RGB_FILE, 0x6ffffff);
87 else
88 err = write_int(MODE_RGB_FILE, 0x00);
89 pthread_mutex_unlock(&g_lock);
90 return err;
91 }
92
set_light_backlight(struct light_device_t * dev,struct light_state_t const * state)93 static int set_light_backlight(struct light_device_t *dev,
94 struct light_state_t const *state)
95 {
96 int err;
97 int brightness = rgb_to_brightness(state);
98
99 pthread_mutex_lock(&g_lock);
100 err = write_int(BACKLIGHT_FILE, brightness);
101 pthread_mutex_unlock(&g_lock);
102
103 return err;
104 }
105
106 /** Close the lights device */
close_lights(struct light_device_t * dev)107 static int close_lights(struct light_device_t *dev)
108 {
109 if (dev)
110 free(dev);
111 return 0;
112 }
113
114 /** 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)115 static int open_lights(const struct hw_module_t *module, char const *name,
116 struct hw_device_t **device)
117 {
118 struct light_device_t *dev = malloc(sizeof(struct light_device_t));
119 int (*set_light) (struct light_device_t *dev,
120 struct light_state_t const *state);
121 pthread_t lighting_poll_thread;
122 ALOGV("open lights");
123 if (dev == NULL) {
124 ALOGE("failed to allocate memory");
125 return -1;
126 }
127 memset(dev, 0, sizeof(*dev));
128
129 if (0 == strcmp(LIGHT_ID_BACKLIGHT, name))
130 set_light = set_light_backlight;
131 else if (0 == strcmp(LIGHT_ID_BATTERY, name))
132 set_light = set_light_battery;
133 else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
134 set_light = set_light_notifications;
135 else
136 return -EINVAL;
137
138 pthread_mutex_init(&g_lock, NULL);
139
140 dev->common.tag = HARDWARE_DEVICE_TAG;
141 dev->common.version = 0;
142 dev->common.module = (struct hw_module_t *)module;
143 dev->common.close = (int (*)(struct hw_device_t *))close_lights;
144 dev->set_light = set_light;
145
146 *device = (struct hw_device_t *)dev;
147
148 return 0;
149 }
150
151 static struct hw_module_methods_t lights_methods =
152 {
153 .open = open_lights,
154 };
155
156 /*
157 * The backlight Module
158 */
159 struct hw_module_t HAL_MODULE_INFO_SYM =
160 {
161 .tag = HARDWARE_MODULE_TAG,
162 .version_major = 1,
163 .version_minor = 0,
164 .id = LIGHTS_HARDWARE_MODULE_ID,
165 .name = "Flounder lights module",
166 .author = "NVIDIA",
167 .methods = &lights_methods,
168 };
169