1 files changed, 300 insertions, 0 deletions
diff --git a/liblight/lights.c b/liblight/lights.c
new file mode 100644
index 0000000..4dc4abb
--- /dev/null
+++ b/liblight/lights.c
@@ -0,0 +1,300 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * Copyright (C) 2014 The Linux Foundation. All rights reserved.
+ * Copyright (C) 2016 The CyanogenMod 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 <stdlib.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_attention;
+static struct light_state_t g_notification;
+static struct light_state_t g_battery;
+
+static const char RED_LED_FILE[]
+        = "/sys/class/leds/led:rgb_red/brightness";
+
+static const char LCD_FILE[]
+        = "/sys/class/leds/lcd-backlight/brightness";
+
+static const char RED_BLINK_FILE[]
+        = "/sys/class/leds/led:rgb_red/rgbbreath";
+
+#define RAMP_SIZE 8
+static int BRIGHTNESS_RAMP[RAMP_SIZE]
+        = { 0, 12, 25, 37, 50, 72, 85, 100 };
+#define RAMP_STEP_DURATION 50
+
+/**
+ * Device methods
+ */
+
+static 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 = snprintf(buffer, sizeof(buffer), "%d\n", value);
+        ssize_t amt = write(fd, buffer, (size_t)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 write_str(char const* path, char* value)
+{
+    int fd;
+    static int already_warned = 0;
+
+    fd = open(path, O_RDWR);
+    if (fd >= 0) {
+        char buffer[1024];
+        int bytes = snprintf(buffer, sizeof(buffer), "%s\n", value);
+        ssize_t amt = write(fd, buffer, (size_t)bytes);
+        close(fd);
+        return amt == -1 ? -errno : 0;
+    } else {
+        if (already_warned == 0) {
+            ALOGE("write_str 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);
+    if(!dev) {
+        return -1;
+    }
+    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 red;
+    int blink;
+    int onMS, offMS, stepDuration, pauseHi;
+    unsigned int colorRGB;
+    char *duty;
+
+    if(!dev) {
+        return -1;
+    }
+
+    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;
+
+    ALOGV("set_speaker_light_locked mode %d, colorRGB=%08X, onMS=%d, offMS=%d\n",
+            state->flashMode, colorRGB, onMS, offMS);
+
+    red = (colorRGB >> 16) & 0xFF;
+
+    blink = onMS > 0 && offMS > 0;
+
+    // Disable all blinking to start
+    write_int(RED_BLINK_FILE, 0);
+
+    if (blink) {
+        stepDuration = RAMP_STEP_DURATION;
+        pauseHi = onMS - (stepDuration * RAMP_SIZE * 2);
+        if (stepDuration * RAMP_SIZE * 2 > onMS) {
+            stepDuration = onMS / (RAMP_SIZE * 2);
+            pauseHi = 0;
+        }
+
+        // Start the party
+        write_int(RED_BLINK_FILE, red);
+
+    } else {
+        write_int(RED_LED_FILE, red);
+    }
+
+
+    return 0;
+}
+
+static void handle_speaker_light_locked(struct light_device_t* dev)
+{
+    if (is_lit(&g_attention)) {
+        set_speaker_light_locked(dev, &g_attention);
+    } else if (is_lit(&g_notification)) {
+        set_speaker_light_locked(dev, &g_notification);
+    } else {
+        set_speaker_light_locked(dev, &g_battery);
+    }
+}
+
+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_light_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_light_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);
+    g_attention = *state;
+    handle_speaker_light_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));
+
+    if(!dev)
+        return -ENOMEM;
+
+    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 = "ZUK Z2 Lights Module",
+    .author = "The CyanogenMod Project",
+    .methods = &lights_module_methods,
+};