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authorDaniel Hillenbrand <daniel.hillenbrand@codeworkx.de>2012-06-16 01:43:50 +0200
committerDaniel Hillenbrand <daniel.hillenbrand@codeworkx.de>2012-06-16 01:43:50 +0200
commit4361c7c1e73f2e2ef8ad3554d06d13aee02a7411 (patch)
tree596e9a16b051ff8ecfbf32ca876c683c852c9cda /liblights/lights.c
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initial commit
Diffstat (limited to 'liblights/lights.c')
-rw-r--r--liblights/lights.c142
1 files changed, 142 insertions, 0 deletions
diff --git a/liblights/lights.c b/liblights/lights.c
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index 0000000..4829663
--- /dev/null
+++ b/liblights/lights.c
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * Copyright (C) 2012 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"
+#define LOG_NDEBUG 0
+
+#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>
+
+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/pwm-backlight/brightness";
+
+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 = 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) {
+ LOGE("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);
+ LOGD("set_light_backlight brightness=%d\n", brightness);
+ err = write_int(LCD_FILE, brightness);
+ pthread_mutex_unlock(&g_lock);
+
+ return err;
+}
+
+static int close_lights(struct light_device_t *dev)
+{
+ LOGV("close_light is called");
+ if (dev)
+ free(dev);
+
+ return 0;
+}
+
+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 {
+ 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 = "Espresso10 Lights Module",
+ .author = "The CyanogenMod Project",
+ .methods = &lights_module_methods,
+};