From a3ff3a6690e0b68605dfdc076886c2e3b78ba16e Mon Sep 17 00:00:00 2001 From: Ed Heyl Date: Thu, 2 Sep 2010 20:38:12 -0700 Subject: S5PC11X: backlight: Added backlight HAL driver to control the brightness Change-Id: Id092fbb994a1dc0ab495d53df2dbb10a48680dea Signed-off-by: sl47.kim --- liblight/Android.mk | 30 ++++++++++++ liblight/lights.c | 129 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 159 insertions(+) create mode 100755 liblight/Android.mk create mode 100755 liblight/lights.c (limited to 'liblight') diff --git a/liblight/Android.mk b/liblight/Android.mk new file mode 100755 index 0000000..321526b --- /dev/null +++ b/liblight/Android.mk @@ -0,0 +1,30 @@ +# 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, not prelinked and stored in +# hw/..so +include $(CLEAR_VARS) + +LOCAL_SRC_FILES := lights.c + +LOCAL_PRELINK_MODULE := false +LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw + +LOCAL_SHARED_LIBRARIES := liblog + +LOCAL_MODULE := lights.$(TARGET_BOARD_PLATFORM) + +include $(BUILD_SHARED_LIBRARY) diff --git a/liblight/lights.c b/liblight/lights.c new file mode 100755 index 0000000..ee6416a --- /dev/null +++ b/liblight/lights.c @@ -0,0 +1,129 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include +#include + +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/s5p_bl/brightness"; + +static int write_int(char const *path, int value) +{ + int fd; + static int already_warned; + + already_warned = 0; + + LOGV("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) +{ + 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); + + LOGV("open_lights: open with %s", name); + + if (0 == strcmp(LIGHT_ID_BACKLIGHT, name)) + set_light = set_light_backlight; + else + return -EINVAL; + + pthread_mutex_init(&g_lock, NULL); + + 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, +}; -- cgit v1.1