summaryrefslogtreecommitdiffstats
path: root/liblight/lights.c
blob: 52bce3f59f90c3e3810a1d5cbea9cc62c4d5b81e (plain)
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
220
221
222
/*
 * Copyright (C) 2008 The Android Open Source 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_TAG "lights"
#include <cutils/log.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <hardware/lights.h>
#include <linux/leds-an30259a.h>

static pthread_once_t g_init = PTHREAD_ONCE_INIT;
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;

char const *const LCD_FILE = "/sys/class/backlight/s6e8aa0/brightness";
char const *const LED_FILE = "/dev/an30259a_leds";

#define IMAX 0 // 12.75mA power consumption

// Slope values, based on total blink of 1000ms
#define SLOPE_UP_1		450
#define SLOPE_UP_2		(500-SLOPE_UP_1)
#define SLOPE_DOWN_1	SLOPE_UP_2
#define SLOPE_DOWN_2	SLOPE_UP_1
// brightness at mid-slope, on 0 - 127 scale
#define MID_BRIGHTNESS  31

void init_g_lock(void)
{
	pthread_mutex_init(&g_lock, NULL);
}

static int write_int(char const *path, int value)
{
	int fd;
	static int already_warned;

	already_warned = 0;

	ALOGV("write_int: path %s, value %d", path, value);
	fd = open(path, O_RDWR);

	if (fd >= 0) {
		char buffer[20];
		int bytes = sprintf(buffer, "%d\n", value);
		int amt = write(fd, buffer, bytes);
		close(fd);
		return amt == -1 ? -errno : 0;
	} else {
		if (already_warned == 0) {
			LOGE("write_int failed to open %s\n", path);
			already_warned = 1;
		}
		return -errno;
	}
}

static int rgb_to_brightness(struct light_state_t const *state)
{
	int color = state->color & 0x00ffffff;

	return ((77*((color>>16) & 0x00ff))
		+ (150*((color>>8) & 0x00ff)) + (29*(color & 0x00ff))) >> 8;
}

static int set_light_backlight(struct light_device_t *dev,
			struct light_state_t const *state)
{
	int err = 0;
	int brightness = rgb_to_brightness(state);

	pthread_mutex_lock(&g_lock);
	err = write_int(LCD_FILE, brightness);

	pthread_mutex_unlock(&g_lock);
	return err;
}

static int close_lights(struct light_device_t *dev)
{
	ALOGV("close_light is called");
	if (dev)
		free(dev);

	return 0;
}

/* LEDs */
static int write_leds(struct an30259a_pr_control *led)
{
	int err = 0;
	int imax = IMAX;
	int fd;

	pthread_mutex_lock(&g_lock);

	fd = open(LED_FILE, O_RDWR);
	if (fd >= 0) {
		err = ioctl(fd, AN30259A_PR_SET_IMAX, &imax);
		if (err)
			LOGE("failed to set imax");

		err = ioctl(fd, AN30259A_PR_SET_LED, led);
		if (err < 0)
			LOGE("failed to set leds!");

		close(fd);
	} else {
		LOGE("failed to open %s!", LED_FILE);
		err =  -errno;
	}

	pthread_mutex_unlock(&g_lock);

	return err;
}

static int set_light_leds(struct light_state_t const *state, int type)
{
	struct an30259a_pr_control led;

	memset(&led, 0, sizeof(led));

	switch (state->flashMode) {
	case LIGHT_FLASH_NONE:
		led.state = LED_LIGHT_OFF;
		break;
	case LIGHT_FLASH_TIMED:
	case LIGHT_FLASH_HARDWARE:
		led.state = LED_LIGHT_SLOPE;
		led.color = state->color & 0x00ffffff;
		// tweak to eliminate purplish tint from white color
		if (led.color == 0x00ffffff)
		    led.color = 0x80ff80;
		// scale slope times based on flashOnMS
		led.time_slope_up_1 = (SLOPE_UP_1 * state->flashOnMS) / 1000;
		led.time_slope_up_2 = (SLOPE_UP_2 * state->flashOnMS) / 1000;
		led.time_slope_down_1 = (SLOPE_DOWN_1 * state->flashOnMS) / 1000;
		led.time_slope_down_2 = (SLOPE_DOWN_2 * state->flashOnMS) / 1000;
		led.mid_brightness = MID_BRIGHTNESS;
		led.time_off = state->flashOffMS;
		break;
	default:
		return -EINVAL;
	}

	return write_leds(&led);
}

static int set_light_leds_notifications(struct light_device_t *dev,
			struct light_state_t const *state)
{
	return set_light_leds(state, 0);
}

static int set_light_leds_attention(struct light_device_t *dev,
			struct light_state_t const *state)
{
	return set_light_leds(state, 1);
}

static int open_lights(const struct hw_module_t *module, char const *name,
						struct hw_device_t **device)
{
	int (*set_light)(struct light_device_t *dev,
		struct light_state_t const *state);

	if (0 == strcmp(LIGHT_ID_BACKLIGHT, name))
		set_light = set_light_backlight;
	else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
		set_light = set_light_leds_notifications;
	else if (0 == strcmp(LIGHT_ID_ATTENTION, name))
		set_light = set_light_leds_attention;
	else
		return -EINVAL;

	pthread_once(&g_init, init_g_lock);

	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,
};

const struct hw_module_t HAL_MODULE_INFO_SYM = {
	.tag = HARDWARE_MODULE_TAG,
	.version_major = 1,
	.version_minor = 0,
	.id = LIGHTS_HARDWARE_MODULE_ID,
	.name = "lights Module",
	.author = "Google, Inc.",
	.methods = &lights_module_methods,
};