5c80b94820
Since the kernel side should call nxsem_xxx instead and remove the unused inclusion
546 lines
15 KiB
C
546 lines
15 KiB
C
/****************************************************************************
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* drivers/rgbled.c
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*
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* Copyright (C) 2016-2018 Gregory Nutt. All rights reserved.
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* Author: Alan Carvalho de Assis <acassis@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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/types.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/arch.h>
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#include <nuttx/timers/pwm.h>
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#include <nuttx/leds/rgbled.h>
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#include <nuttx/semaphore.h>
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#include <arch/irq.h>
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#ifdef CONFIG_RGBLED
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/****************************************************************************
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* Private Type Definitions
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****************************************************************************/
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/* This structure describes the state of the upper half driver */
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struct rgbled_upperhalf_s
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{
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uint8_t crefs; /* The number of times the device has been opened */
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volatile bool started; /* True: pulsed output is being generated */
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sem_t exclsem; /* Supports mutual exclusion */
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FAR struct pwm_lowerhalf_s *devledr;
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FAR struct pwm_lowerhalf_s *devledg;
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FAR struct pwm_lowerhalf_s *devledb;
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#ifdef CONFIG_PWM_MULTICHAN
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int chanr; /* Red PWM channel */
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int chang; /* Green PWM channel */
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int chanb; /* Blue PWM channel */
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#endif
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static int rgbled_open(FAR struct file *filep);
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static int rgbled_close(FAR struct file *filep);
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static ssize_t rgbled_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static ssize_t rgbled_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_rgbledops =
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{
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rgbled_open, /* open */
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rgbled_close, /* close */
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rgbled_read, /* read */
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rgbled_write, /* write */
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NULL, /* seek */
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NULL, /* ioctl */
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NULL /* poll */
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#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
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, NULL /* unlink */
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#endif
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: rgbled_open
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*
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* Description:
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* This function is called whenever the PWM device is opened.
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*
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****************************************************************************/
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static int rgbled_open(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct rgbled_upperhalf_s *upper = inode->i_private;
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uint8_t tmp;
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int ret;
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lcdinfo("crefs: %d\n", upper->crefs);
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/* Get exclusive access to the device structures */
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ret = nxsem_wait(&upper->exclsem);
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if (ret < 0)
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{
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lcderr("ERROR: nxsem_wait failed: %d\n", ret);
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goto errout;
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}
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/* Increment the count of references to the device. If this the first
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* time that the driver has been opened for this device, then initialize
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* the device.
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*/
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tmp = upper->crefs + 1;
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if (tmp == 0)
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{
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/* More than 255 opens; uint8_t overflows to zero */
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ret = -EMFILE;
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goto errout_with_sem;
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}
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/* Save the new open count on success */
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upper->crefs = tmp;
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ret = OK;
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errout_with_sem:
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nxsem_post(&upper->exclsem);
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errout:
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return ret;
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}
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/****************************************************************************
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* Name: rgbled_close
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*
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* Description:
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* This function is called when the PWM device is closed.
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*
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****************************************************************************/
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static int rgbled_close(FAR struct file *filep)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct rgbled_upperhalf_s *upper = inode->i_private;
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int ret;
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lcdinfo("crefs: %d\n", upper->crefs);
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/* Get exclusive access to the device structures */
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ret = nxsem_wait(&upper->exclsem);
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if (ret < 0)
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{
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lcderr("ERROR: nxsem_wait failed: %d\n", ret);
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goto errout;
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}
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/* Decrement the references to the driver. If the reference count will
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* decrement to 0, then uninitialize the driver.
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*/
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if (upper->crefs > 1)
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{
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upper->crefs--;
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}
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nxsem_post(&upper->exclsem);
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ret = OK;
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errout:
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return ret;
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}
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/****************************************************************************
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* Name: rgbled_read
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*
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* Description:
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* A dummy read method. This is provided only to satisfy the VFS layer.
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*
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****************************************************************************/
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static ssize_t rgbled_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen)
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{
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/* Return zero -- usually meaning end-of-file */
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return 0;
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}
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/****************************************************************************
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* Name: rgbled_lightness
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*
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* Description:
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* Convert an 8-bit color level to a 16-bit PWM command, using a
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* piecewise linear approximation of the CIE 1931 lightness formula.
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*
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****************************************************************************/
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#ifdef CONFIG_RGBLED_LIGHTNESS_CORRECTION
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static unsigned short rgbled_lightness(unsigned char color_level)
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{
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unsigned int lut_index;
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unsigned short pwm_cmd = 0;
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static const unsigned char lut_color_in[9] =
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{
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0x00, 0x20, 0x40, 0x60, 0x80, 0xa0, 0xc0, 0xe0, 0xff
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};
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static const unsigned short lut_pwm_out[9] =
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{
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0x0000, 0x03d1, 0x0b62, 0x1952, 0x2f93,
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0x5015, 0x7ccb, 0xb7a7, 0xffff
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};
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for (lut_index = 0; lut_index < sizeof(lut_color_in); ++lut_index)
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{
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if (lut_color_in[lut_index] >= color_level)
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{
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break;
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}
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}
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if (lut_index < sizeof(lut_color_in))
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{
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if (lut_color_in[lut_index] == color_level)
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{
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pwm_cmd = lut_pwm_out[lut_index];
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}
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else
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{
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pwm_cmd = (unsigned short)(lut_pwm_out[lut_index - 1] +
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(int)(lut_pwm_out[lut_index] - lut_pwm_out[lut_index - 1]) *
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(int)(color_level - lut_color_in[lut_index - 1]) /
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(int)(lut_color_in[lut_index] - lut_color_in[lut_index - 1]));
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}
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}
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return pwm_cmd;
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}
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#endif /* CONFIG_RGBLED_LIGHTNESS_CORRECTION */
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/****************************************************************************
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* Name: rgbled_write
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*
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* Description:
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* A write method which parses an HTML-style RGB string like "#FF8833"
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* into color values, and sends them to the lower-half PWM drivers.
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*
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****************************************************************************/
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static ssize_t rgbled_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct rgbled_upperhalf_s *upper = inode->i_private;
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FAR struct pwm_lowerhalf_s *ledr = upper->devledr;
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FAR struct pwm_lowerhalf_s *ledg = upper->devledg;
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FAR struct pwm_lowerhalf_s *ledb = upper->devledb;
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struct pwm_info_s pwm;
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unsigned int red;
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unsigned int green;
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unsigned int blue;
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char color[3];
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#ifdef CONFIG_PWM_MULTICHAN
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int i;
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#endif
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/* We need to receive a string #RRGGBB = 7 bytes */
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if (buffer == NULL || buflen < 7)
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{
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/* Well... nothing to do */
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return -EINVAL;
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}
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/* Check if it is a color format */
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if (buffer[0] != '#')
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{
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/* The color code needs to start with # */
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return -EINVAL;
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}
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/* Move buffer to next character */
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buffer++;
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color[0] = buffer[0];
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color[1] = buffer[1];
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color[2] = '\0';
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red = strtol(color, NULL, 16);
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color[0] = buffer[2];
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color[1] = buffer[3];
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color[2] = '\0';
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green = strtol(color, NULL, 16);
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color[0] = buffer[4];
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color[1] = buffer[5];
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color[2] = '\0';
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blue = strtol(color, NULL, 16);
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/* Sane check */
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if (red > 255)
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{
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red = 255;
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}
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if (green > 255)
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{
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green = 255;
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}
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if (blue > 255)
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{
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blue = 255;
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}
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/* Convert 8bit to 16bits */
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#ifdef CONFIG_RGBLED_LIGHTNESS_CORRECTION
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red = rgbled_lightness((unsigned char)red);
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green = rgbled_lightness((unsigned char)green);
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blue = rgbled_lightness((unsigned char)blue);
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#else
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red = (red << 8) | red;
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green = (green << 8) | green;
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blue = (blue << 8) | blue;
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#endif
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#ifdef CONFIG_RGBLED_INVERT
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red ^= 0xffff;
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green ^= 0xffff;
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blue ^= 0xffff;
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#endif
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#ifdef CONFIG_PWM_MULTICHAN
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memset(&pwm, 0, sizeof(struct pwm_info_s));
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pwm.frequency = 100;
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i = 0;
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pwm.channels[i].duty = red;
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pwm.channels[i++].channel = upper->chanr;
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/* If the green pwm source is on the same timer as the red,
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* set that up now too.
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*/
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if (ledr == ledg)
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{
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pwm.channels[i].duty = green;
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pwm.channels[i++].channel = upper->chang;
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}
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/* If the blue pwm source is on the same timer as the red,
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* set that up now too.
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*/
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if (ledr == ledb)
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{
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pwm.channels[i].duty = blue;
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pwm.channels[i++].channel = upper->chanb;
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}
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ledr->ops->start(ledr, &pwm);
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for (i = 0; i < CONFIG_PWM_NCHANNELS; i++)
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{
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pwm.channels[i].channel = 0;
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}
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/* If the green timer is not the same as the red timer, update it
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* separately.
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*/
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if (ledg != ledr)
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{
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i = 0;
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pwm.channels[i].duty = green;
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pwm.channels[i++].channel = upper->chang;
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/* If the blue pwm source is on the same timer as the green,
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* set that up now too.
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*/
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if (ledg == ledb)
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{
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pwm.channels[i].duty = blue;
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pwm.channels[i++].channel = upper->chanb;
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}
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ledg->ops->start(ledg, &pwm);
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for (i = 0; i < CONFIG_PWM_NCHANNELS; i++)
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{
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pwm.channels[i].channel = 0;
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}
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}
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/* If the blue timer is not the same as the red or green timer, update it
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* separately.
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*/
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if (ledb != ledr && ledb != ledg)
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{
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pwm.channels[0].duty = green;
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pwm.channels[0].channel = upper->chanb;
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ledb->ops->start(ledb, &pwm);
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}
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#else
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pwm.frequency = 100;
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pwm.duty = red;
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ledr->ops->start(ledr, &pwm);
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pwm.duty = green;
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ledg->ops->start(ledg, &pwm);
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pwm.duty = blue;
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ledb->ops->start(ledb, &pwm);
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#endif
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return buflen;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: rgbled_register
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*
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* Description:
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* This function binds three instances of a "lower half" PWM driver with
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* the "upper half" RGB LED device and registers that device so that can
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* be used by application code.
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*
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*
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* Input Parameters:
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* path - The full path to the driver to be registers in the NuttX pseudo-
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* filesystem. The recommended convention is to name all PWM drivers
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* as "/dev/rgdbled0", "/dev/rgbled1", etc. where the driver path
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* differs only in the "minor" number at the end of the device name.
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* ledr, ledg, and ledb - A pointer to an instance of lower half PWM
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* drivers for the red, green, and blue LEDs, respectively. These
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* instances will be bound to the RGB LED driver and must persists as
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* long as that driver persists.
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* chanr, chang, chanb -Red/Green/Blue PWM channels (only if
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* CONFIG_PWM_MULTICHAN is defined)
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*
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* Returned Value:
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* Zero on success; a negated errno value on failure.
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*
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****************************************************************************/
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int rgbled_register(FAR const char *path, FAR struct pwm_lowerhalf_s *ledr,
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FAR struct pwm_lowerhalf_s *ledg,
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FAR struct pwm_lowerhalf_s *ledb
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#ifdef CONFIG_PWM_MULTICHAN
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, int chanr, int chang, int chanb
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#endif
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)
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{
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FAR struct rgbled_upperhalf_s *upper;
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/* Allocate the upper-half data structure */
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upper = (FAR struct rgbled_upperhalf_s *)
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kmm_zalloc(sizeof(struct rgbled_upperhalf_s));
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if (!upper)
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{
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lcderr("ERROR: Allocation failed\n");
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return -ENOMEM;
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}
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/* Initialize the PWM device structure (it was already zeroed by
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* kmm_zalloc())
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*/
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nxsem_init(&upper->exclsem, 0, 1);
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upper->devledr = ledr;
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upper->devledg = ledg;
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upper->devledb = ledb;
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#ifdef CONFIG_PWM_MULTICHAN
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upper->chanr = chanr;
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upper->chang = chang;
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upper->chanb = chanb;
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#endif
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/* Register the PWM device */
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lcdinfo("Registering %s\n", path);
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return register_driver(path, &g_rgbledops, 0666, upper);
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}
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#endif /* CONFIG_RGBLED */
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