dd20c1355b
Gregory Nutt is the copyright holder for those files and he has submitted the SGA as a result we can migrate the licenses to Apache. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
/****************************************************************************
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* apps/graphics/ft80x/ft80x_backlight.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/ioctl.h>
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#include <stdint.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/lcd/ft80x.h>
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#include "graphics/ft80x.h"
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#include "ft80x.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ft80x_backlight_set
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*
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* Description:
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* Set the backlight intensity via the PWM duty.
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*
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* Input Parameters:
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* fd - The file descriptor of the FT80x device. Opened by the caller
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* with write access.
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* duty - The new backlight duty (as a percentage 0..100)
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*
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* Returned Value:
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* Zero (OK) on success. A negated errno value on failure.
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*
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****************************************************************************/
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int ft80x_backlight_set(int fd, uint8_t duty)
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{
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uint16_t duty128;
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int ret;
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DEBUGASSERT(duty <= 100);
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/* 0% corresponds to the value 0, but 100% corresponds to the value 128 */
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duty128 = ((uint16_t)duty << 7) / 100;
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/* Perform the IOCTL to set the backlight duty */
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ret = ft80x_putreg8(fd, FT80X_REG_PWM_DUTY, (uint8_t)duty128);
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if (ret < 0)
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{
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ft80x_err("ERROR: ft80x_putreg8 failed: %d\n", ret);
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}
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return ret;
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}
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/****************************************************************************
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* Name: ft80x_backlight_fade
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*
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* Description:
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* Change the backlight intensity with a controllable fade.
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*
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* Input Parameters:
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* fd - The file descriptor of the FT80x device. Opened by the caller
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* with write access.
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* duty - The terminal duty (as a percentage 0..100)
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* delay - The duration of the fade in milliseconds (10..16700)
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*
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* Returned Value:
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* Zero (OK) on success. A negated errno value on failure.
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*
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****************************************************************************/
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int ft80x_backlight_fade(int fd, uint8_t duty, uint16_t delay)
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{
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struct ft80x_fade_s fade;
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int ret;
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DEBUGASSERT(duty <= 100);
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/* Perform the IOCTL to perform the fade */
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fade.duty = duty;
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fade.delay = delay;
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ret = ioctl(fd, FT80X_IOC_FADE, (unsigned long)((uintptr_t)&fade));
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if (ret < 0)
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{
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int errcode = errno;
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ft80x_err("ERROR: ioctl(FT80X_IOC_FADE) failed: %d\n", errcode);
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ret = -errcode;
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}
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return ret;
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}
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