Add backlight support

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

5 files changed, 168 insertions, 1 deletions

diff --git a/Android.mk b/Android.mk
index 1c541f7..9176697 100644
--- a/Android.mk
+++ b/Android.mk
@@ -30,3 +30,5 @@ $(LOCAL_BUILT_MODULE):
 	$(hide) echo "Linking $(CAMERA_LIB) <- $(CAMERA_DEFAULT)"
 	$(hide) mkdir -p $(TARGET_OUT_SHARED_LIBRARIES)/hw
 	$(hide) ln -sf $(CAMERA_LIB) $(CAMERA_DEFAULT)
+
+include $(call all-makefiles-under,$(LOCAL_PATH))
diff --git a/full_armadillo.mk b/full_armadillo.mk
index e3d167c..3bbbd75 100644
--- a/full_armadillo.mk
+++ b/full_armadillo.mk
@@ -28,7 +28,8 @@ PRODUCT_PACKAGES := \
 # Camera
 PRODUCT_PACKAGES += \
     Camera \
-    camera.v4l
+    camera.v4l \
+    lights.armadillo800eva
 
 # Inherit from those products. Most specific first.
 $(call inherit-product, $(SRC_TARGET_DIR)/product/full_base.mk)
diff --git a/init.armadillo800eva.rc b/init.armadillo800eva.rc
index c3ec6ed..656c229 100644
--- a/init.armadillo800eva.rc
+++ b/init.armadillo800eva.rc
@@ -15,6 +15,7 @@ on boot
 
 	chmod 0666 /dev/video0
 	chmod 0664 /dev/graphics/fb0
+	chown system /sys/class/backlight/pwm-backlight.0/brightness
 
 # fake some battery state
 	setprop hw.nobattery true
diff --git a/liblight/Android.mk b/liblight/Android.mk
new file mode 100644
index 0000000..b2d9764
--- /dev/null
+++ b/liblight/Android.mk
@@ -0,0 +1,31 @@
+# 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.
+
+ifneq ($(filter armadillo,$(TARGET_DEVICE)),)
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := lights.armadillo800eva
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
+
+LOCAL_SRC_FILES := lights.c
+
+LOCAL_SHARED_LIBRARIES := liblog
+
+include $(BUILD_SHARED_LIBRARY)
+
+endif
diff --git a/liblight/lights.c b/liblight/lights.c
new file mode 100644
index 0000000..43ff00a
--- /dev/null
+++ b/liblight/lights.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2012 Renesas Solutions Corp.
+ * 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 <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <cutils/log.h>
+#include <hardware/lights.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+
+static pthread_once_t g_init = PTHREAD_ONCE_INIT;
+static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
+
+static char const * const BACKLIGHT_FILE =
+	"/sys/class/backlight/pwm-backlight.0/brightness";
+
+static int file_write_integer(char const *path, int value)
+{
+	static int already_warned = 0;
+	char buffer[11];
+	int bytes;
+	int ret;
+	int fd;
+
+	LOGV("%s: path %s, value %d", __func__, path, value);
+	fd = open(path, O_RDWR);
+	if (fd < 0) {
+		if (!already_warned) {
+			LOGE("%s: failed to open %s\n", __func__, path);
+			already_warned = 1;
+		}
+		return -errno;
+	}
+
+	bytes = sprintf(buffer, "%d\n", value);
+	ret = write(fd, buffer, bytes);
+	close(fd);
+
+	return ret == -1 ? -errno : 0;
+}
+
+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 light_set_backlight(struct light_device_t *dev,
+			       struct light_state_t const *state)
+{
+	int brightness = rgb_to_brightness(state);
+	int err;
+
+	pthread_mutex_lock(&g_lock);
+	err = file_write_integer(BACKLIGHT_FILE, brightness);
+	pthread_mutex_unlock(&g_lock);
+
+	return err;
+}
+
+static int light_close(struct light_device_t *dev)
+{
+	free(dev);
+	return 0;
+}
+
+static int light_open(const struct hw_module_t *module, char const *name,
+		      struct hw_device_t **device)
+{
+	int (*set)(struct light_device_t *dev,
+		   struct light_state_t const *state);
+	struct light_device_t *dev;
+
+	LOGV("%s: open with %s", __func__, name);
+
+	if (!strcmp(LIGHT_ID_BACKLIGHT, name))
+		set = light_set_backlight;
+	else
+		return -EINVAL;
+
+	pthread_mutex_init(&g_lock, NULL);
+
+	dev = malloc(sizeof(*dev));
+	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 *))light_close;
+	dev->set_light = set;
+
+	*device = (struct hw_device_t *)dev;
+
+	return 0;
+}
+
+static struct hw_module_methods_t lights_module_methods = {
+	.open =  light_open,
+};
+
+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 = "Backlight Module",
+	.author = "Laurent Pinchart <laurent.pinchart@ideasonboard.com>",
+	.methods = &lights_module_methods,
+};