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 <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
33 static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
34 char const* const MODE_RGB_FILE = "/sys/class/leds/indicator/ModeRGB";
35 char const* const BACKLIGHT_FILE = "/sys/class/backlight/tegra-dsi-backlight.0/brightness";
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 = snprintf(buffer, 20, "%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 ALOGE("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_battery(struct light_device_t * dev,struct light_state_t const * state)64 static int set_light_battery(struct light_device_t* dev,
65 struct light_state_t const* state)
66 {
67 int err;
68 pthread_mutex_lock(&g_lock);
69 ALOGV("set_light_battery, flashMode:%x, color:%x", state->flashMode, state->color);
70 if(state->color)
71 err = write_int(MODE_RGB_FILE, 0x1ffffff);
72 else
73 err = write_int(MODE_RGB_FILE, 0x00);
74 pthread_mutex_unlock(&g_lock);
75 return err;
76 }
77
set_light_notifications(struct light_device_t * dev,struct light_state_t const * state)78 static int set_light_notifications(struct light_device_t* dev,
79 struct light_state_t const* state)
80 {
81 int err;
82 pthread_mutex_lock(&g_lock);
83 ALOGV("set_light_notifications, flashMode:%x, color:%x", state->flashMode, state->color);
84 if(state->flashMode)
85 err = write_int(MODE_RGB_FILE, 0x6ffffff);
86 else
87 err = write_int(MODE_RGB_FILE, 0x00);
88 pthread_mutex_unlock(&g_lock);
89 return err;
90 }
91
set_light_backlight(struct light_device_t * dev,struct light_state_t const * state)92 static int set_light_backlight(struct light_device_t *dev,
93 struct light_state_t const *state)
94 {
95 int err;
96 int brightness = rgb_to_brightness(state);
97
98 pthread_mutex_lock(&g_lock);
99 err = write_int(BACKLIGHT_FILE, brightness);
100 pthread_mutex_unlock(&g_lock);
101
102 return err;
103 }
104
105 /** Close the lights device */
close_lights(struct light_device_t * dev)106 static int close_lights(struct light_device_t *dev)
107 {
108 if (dev)
109 free(dev);
110 return 0;
111 }
112
113 /** 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)114 static int open_lights(const struct hw_module_t *module, char const *name,
115 struct hw_device_t **device)
116 {
117 struct light_device_t *dev = malloc(sizeof(struct light_device_t));
118 int (*set_light) (struct light_device_t *dev,
119 struct light_state_t const *state);
120 pthread_t lighting_poll_thread;
121 ALOGV("open lights");
122 if (dev == NULL) {
123 ALOGE("failed to allocate memory");
124 return -1;
125 }
126 memset(dev, 0, sizeof(*dev));
127
128 if (0 == strcmp(LIGHT_ID_BACKLIGHT, name))
129 set_light = set_light_backlight;
130 else if (0 == strcmp(LIGHT_ID_BATTERY, name))
131 set_light = set_light_battery;
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 dev->common.tag = HARDWARE_DEVICE_TAG;
140 dev->common.version = 0;
141 dev->common.module = (struct hw_module_t *)module;
142 dev->common.close = (int (*)(struct hw_device_t *))close_lights;
143 dev->set_light = set_light;
144
145 *device = (struct hw_device_t *)dev;
146
147 return 0;
148 }
149
150 static struct hw_module_methods_t lights_methods =
151 {
152 .open = open_lights,
153 };
154
155 /*
156 * The backlight Module
157 */
158 struct hw_module_t HAL_MODULE_INFO_SYM =
159 {
160 .tag = HARDWARE_MODULE_TAG,
161 .version_major = 1,
162 .version_minor = 0,
163 .id = LIGHTS_HARDWARE_MODULE_ID,
164 .name = "Flounder lights module",
165 .author = "NVIDIA",
166 .methods = &lights_methods,
167 };
168