diff options
Diffstat (limited to 'liblight')
| -rw-r--r-- | liblight/Android.mk | 31 | ||||
| -rw-r--r-- | liblight/lights.c | 132 |
2 files changed, 163 insertions, 0 deletions
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, +}; |