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display: Add lights HAL

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Change-Id: If67d2180e395f60a8f7c458495b78b1cc456b847
This commit is contained in:
Naseer Ahmed 2012-07-10 01:42:20 -07:00
parent 7674342224
commit 4a2207de17
4 changed files with 519 additions and 2 deletions
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4
Android.mk
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@ -2,8 +2,8 @@
#libs to be built for QCOM targets only
ifeq ($(call is-vendor-board-platform,QCOM),true)
display-hals := libgralloc libgenlock libcopybit
display-hals +=libhwcomposer liboverlay libqdutils
display-hals := libgralloc libgenlock libcopybit liblight
display-hals += libhwcomposer liboverlay libqdutils
endif
include $(call all-named-subdir-makefiles,$(display-hals))

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liblight/Android.mk Normal file
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# 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.
LOCAL_PATH:= $(call my-dir)
# HAL module implemenation stored in
# hw/<COPYPIX_HARDWARE_MODULE_ID>.<ro.board.platform>.so
include $(CLEAR_VARS)
LOCAL_SRC_FILES := lights.c
LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
LOCAL_SHARED_LIBRARIES := liblog
LOCAL_MODULE := lights.$(TARGET_BOARD_PLATFORM)
LOCAL_MODULE_TAGS := optional
include $(BUILD_SHARED_LIBRARY)

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liblight/NOTICE Normal file
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Copyright (c) 2008, The Android Open Source Project
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you may not use this file except in compliance with the License.
Unless required by applicable law or agreed to in writing, software
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liblight/lights.c Normal file
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/*
* 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_NDEBUG 0
#define LOG_TAG "lights"
#include <cutils/log.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <hardware/lights.h>
/******************************************************************************/
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_battery;
static int g_attention = 0;
char const*const RED_LED_FILE
= "/sys/class/leds/red/brightness";
char const*const GREEN_LED_FILE
= "/sys/class/leds/green/brightness";
char const*const BLUE_LED_FILE
= "/sys/class/leds/blue/brightness";
char const*const LCD_FILE
= "/sys/class/leds/lcd-backlight/brightness";
/**
* device methods
*/
void init_globals(void)
{
// init the mutex
pthread_mutex_init(&g_lock, NULL);
}
static int
write_int(char const* path, int value)
{
int fd;
static int already_warned = 0;
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) {
ALOGE("write_int failed to open %s\n", path);
already_warned = 1;
}
return -errno;
}
}
static int
is_lit(struct light_state_t const* state)
{
return state->color & 0x00ffffff;
}
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
set_speaker_light_locked(struct light_device_t* dev,
struct light_state_t const* state)
{
int len;
int alpha, red, green, blue;
int blink, freq, pwm;
int onMS, offMS;
unsigned int colorRGB;
switch (state->flashMode) {
case LIGHT_FLASH_TIMED:
onMS = state->flashOnMS;
offMS = state->flashOffMS;
break;
case LIGHT_FLASH_NONE:
default:
onMS = 0;
offMS = 0;
break;
}
colorRGB = state->color;
#if 0
ALOGD("set_speaker_light_locked colorRGB=%08X, onMS=%d, offMS=%d\n",
colorRGB, onMS, offMS);
#endif
red = (colorRGB >> 16) & 0xFF;
green = (colorRGB >> 8) & 0xFF;
blue = colorRGB & 0xFF;
// R, G, B value is among 0, 1, 2
if (red > 128) red = 2;
else if (red <= 128 && red > 0) red = 1;
if (green > 128) green = 2;
else if (green <= 128 && green > 0) green = 1;
if (blue > 128) blue = 2;
else if (blue <= 128 && blue > 0) red = 1;
write_int(RED_LED_FILE, red);
write_int(GREEN_LED_FILE, green);
write_int(BLUE_LED_FILE, blue);
// TODO
if (onMS > 0 && offMS > 0) {
int totalMS = onMS + offMS;
// the LED appears to blink about once per second if freq is 20
// 1000ms / 20 = 50
freq = totalMS / 50;
// pwm specifies the ratio of ON versus OFF
// pwm = 0 -> always off
// pwm = 255 => always on
pwm = (onMS * 255) / totalMS;
// the low 4 bits are ignored, so round up if necessary
if (pwm > 0 && pwm < 16)
pwm = 16;
blink = 1;
} else {
blink = 0;
freq = 0;
pwm = 0;
}
if (blink) {
write_int(RED_LED_FILE, freq);
}
return 0;
}
static void
handle_speaker_battery_locked(struct light_device_t* dev)
{
if (is_lit(&g_battery)) {
set_speaker_light_locked(dev, &g_battery);
} else {
set_speaker_light_locked(dev, &g_notification);
}
}
static int
set_light_battery(struct light_device_t* dev,
struct light_state_t const* state)
{
pthread_mutex_lock(&g_lock);
g_battery = *state;
handle_speaker_battery_locked(dev);
pthread_mutex_unlock(&g_lock);
return 0;
}
static int
set_light_notifications(struct light_device_t* dev,
struct light_state_t const* state)
{
pthread_mutex_lock(&g_lock);
g_notification = *state;
handle_speaker_battery_locked(dev);
pthread_mutex_unlock(&g_lock);
return 0;
}
static int
set_light_attention(struct light_device_t* dev,
struct light_state_t const* state)
{
pthread_mutex_lock(&g_lock);
if (state->flashMode == LIGHT_FLASH_HARDWARE) {
g_attention = state->flashOnMS;
} else if (state->flashMode == LIGHT_FLASH_NONE) {
g_attention = 0;
}
handle_speaker_battery_locked(dev);
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, 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_BATTERY, name))
set_light = set_light_battery;
else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
set_light = set_light_notifications;
else if (0 == strcmp(LIGHT_ID_ATTENTION, name))
set_light = set_light_attention;
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 = "lights Module",
.author = "Google, Inc.",
.methods = &lights_module_methods,
};