drivrs/ioexpander: Add support for a very simple GPIO drivers. It supports only pre-conrigured input and output pins and only basic input and output operations.
This commit is contained in:
Gregory Nutt
parent
8afe721612
commit
ae19ca45e0
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@ -370,17 +370,7 @@ if INPUT
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source drivers/input/Kconfig
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endif # INPUT
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menuconfig IOEXPANDER
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bool "IO Expander Support"
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default n
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---help---
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This directory holds implementations of IO expander drivers.
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See include/nuttx/ioexpander/ioexpander.h for registration information.
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if IOEXPANDER
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source drivers/ioexpander/Kconfig
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endif # IOEXPANDER
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source drivers/lcd/Kconfig
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source drivers/leds/Kconfig
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@ -3,6 +3,17 @@
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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menu "IO Expander/GPIO Support"
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config IOEXPANDER
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bool "Enable IO Expander Support"
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default n
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---help---
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This directory holds implementations of IO expander drivers.
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See include/nuttx/ioexpander/ioexpander.h for registration information.
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if IOEXPANDER
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config IOEXPANDER_PCA9555
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bool "PCA9555 I2C IO expander"
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default n
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@ -40,3 +51,14 @@ config IOEXPANDER_MULTIPIN
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---help---
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This settings enable the definition of routines for
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optimized simultaneous access to multiple pins.
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endif # IOEXPANDER
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config DEV_GPIO
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bool "GPIO driver"
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default n
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---help---
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Enables a simple GPIO input/output driver to support application-
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space testing of hardware.
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endmenu # IO Expander/GPIO Support
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@ -43,6 +43,26 @@ ifeq ($(CONFIG_IOEXPANDER_PCA9555),y)
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CSRCS += pca9555.c
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endif
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endif # CONFIG_IOEXPANDER
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# GPIO test device driver (independent of IOEXPANDERS)
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ifeq ($(CONFIG_DEV_GPIO),y)
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CSRCS += gpio.c
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endif
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# The folling implements an awkward OR
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ifeq ($(CONFIG_IOEXPANDER),y)
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# Include ioexpander I/O device driver build support
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DEPPATH += --dep-path ioexpander
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VPATH += :ioexpander
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CFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" $(TOPDIR)$(DELIM)drivers$(DELIM)ioexpander}
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else ifeq ($(CONFIG_DEV_GPIO),y)
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# Include ioexpander I/O device driver build support
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DEPPATH += --dep-path ioexpander
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@ -0,0 +1,269 @@
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/****************************************************************************
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* drivers/ioexpander/gpio.c
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 <stdio.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/ioexpander/gpio.h>
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#ifdef CONFIG_DEV_GPIO
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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static int gpio_open(FAR struct file *filep);
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static int gpio_close(FAR struct file *filep);
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static ssize_t gpio_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static ssize_t gpio_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen);
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static int gpio_ioctl(FAR struct file *filep, int cmd,
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unsigned long arg);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_gpio_input_ops =
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{
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gpio_open, /* open */
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gpio_close, /* close */
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gpio_read, /* read */
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NULL, /* write */
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NULL, /* seek */
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gpio_ioctl /* ioctl */
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#ifndef CONFIG_DISABLE_POLL
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, NULL /* poll */
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#endif
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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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static const struct file_operations g_gpio_output_ops =
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{
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gpio_open, /* open */
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gpio_close, /* close */
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NULL, /* read */
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gpio_write, /* write */
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NULL, /* seek */
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gpio_ioctl /* ioctl */
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#ifndef CONFIG_DISABLE_POLL
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, NULL /* poll */
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#endif
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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: gpio_open
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*
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* Description:
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* Standard character driver open method.
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*
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****************************************************************************/
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static int gpio_open(FAR struct file *filep)
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{
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return OK;
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}
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/****************************************************************************
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* Name: gpio_close
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*
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* Description:
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* Standard character driver close method.
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*
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****************************************************************************/
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static int gpio_close(FAR struct file *filep)
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{
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return OK;
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}
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/****************************************************************************
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* Name: gpio_read
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*
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* Description:
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* Standard character driver read method.
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*
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****************************************************************************/
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static ssize_t gpio_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen)
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{
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return 0;
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}
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/****************************************************************************
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* Name: gpio_write
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*
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* Description:
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* Standard character driver write method.
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*
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****************************************************************************/
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static ssize_t gpio_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen)
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{
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return (ssize_t)buflen;
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}
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/****************************************************************************
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* Name: gpio_ioctl
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*
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* Description:
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* Standard character driver ioctl method.
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*
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****************************************************************************/
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static int gpio_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
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{
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FAR struct inode *inode;
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FAR struct gpio_common_dev_s *dev;
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int ret = OK;
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DEBUGASSERT(filep != NULL && filep->f_inode != NULL);
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inode = filep->f_inode;
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DEBUGASSERT(inode->i_private != NULL);
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dev = inode->i_private;
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switch (cmd)
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{
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/* Command: GPIO_WRITE
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* Description: Set the value of an output GPIO
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* Argument: 0=output a low value; 1=outut a high value
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*/
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case GPIO_WRITE:
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if (dev->output)
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{
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FAR struct gpio_output_dev_s *outdev =
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(FAR struct gpio_output_dev_s *)dev;
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DEBUGASSERT(outdev->gpout_write != NULL);
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ret = outdev->gpout_write(outdev, (int)arg);
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}
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else
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{
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ret = -EACCES;
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}
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break;
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/* Command: GPIO_READ
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* Description: Read the value of an input or output GPIO
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* Argument: A pointer to an integer value to receive the result:
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* 0=low value; 1=high value.
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*/
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case GPIO_READ:
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if (dev->output)
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{
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FAR struct gpio_output_dev_s *outdev =
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(FAR struct gpio_output_dev_s *)dev;
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DEBUGASSERT(outdev->gpout_read != NULL);
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ret = outdev->gpout_read(outdev);
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}
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else
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{
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FAR struct gpio_input_dev_s *indev =
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(FAR struct gpio_input_dev_s *)dev;
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DEBUGASSERT(indev->gpin_read != NULL);
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ret = indev->gpin_read(indev);
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}
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break;
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}
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return ret;
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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: gpio_input_register
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*
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* Description:
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* Register GPIO input pin device driver.
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*
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****************************************************************************/
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int gpio_input_register(FAR struct gpio_input_dev_s *dev, int minor)
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{
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char devname[16];
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DEBUGASSERT((unsigned int)minor < 100);
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snprintf(devname, 16, "/dev/gpin%u", (unsigned int)minor);
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return register_driver(devname, &g_gpio_input_ops, 0444, dev);
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}
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/****************************************************************************
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* Name: gpio_output_register
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*
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* Description:
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* Register GPIO output pin device driver.
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*
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****************************************************************************/
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int gpio_output_register(FAR struct gpio_output_dev_s *dev, int minor)
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{
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char devname[16];
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DEBUGASSERT((unsigned int)minor < 100);
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snprintf(devname, 16, "/dev/gpout%u", (unsigned int)minor);
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return register_driver(devname, &g_gpio_output_ops, 0222, dev);
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}
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#endif /* CONFIG_DEV_GPIO */
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@ -83,6 +83,7 @@
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#define _LOOPBASE (0x1e00) /* Loop device commands */
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#define _MODEMBASE (0x1f00) /* Modem ioctl commands */
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#define _I2CBASE (0x2000) /* I2C driver commands */
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#define _GPIOBASE (0x2100) /* GPIO driver commands */
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/* boardctl commands share the same number space */
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@ -381,6 +382,11 @@
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#define _I2CIOCVALID(c) (_IOC_TYPE(c)==_I2CBASE)
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#define _I2CIOC(nr) _IOC(_I2CBASE,nr)
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/* GPIO driver command definitions ******************************************/
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#define _GPIOCVALID(c) (_IOC_TYPE(c)==_GPIOBASE)
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#define _GPIOC(nr) _IOC(_GPIOBASE,nr)
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/* boardctl() command definitions *******************************************/
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#define _BOARDIOCVALID(c) (_IOC_TYPE(c)==_BOARDBASE)
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@ -0,0 +1,132 @@
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/********************************************************************************************
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* include/nuttx/ioexpander/gpio.h
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* 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
|
||||
* 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,
|
||||
* 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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#ifndef __INCLUDE_NUTTX_IOEXPANDER_GPIO_H
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#define __INCLUDE_NUTTX_IOEXPANDER_GPIO_H
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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 <nuttx/fs/ioctl.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Command: GPIO_WRITE
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* Description: Set the value of an output GPIO
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* Argument: 0=output a low value; 1=outut a high value
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*
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* Command: GPIO_READ
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* Description: Read the value of an input or output GPIO
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* Argument: A pointer to an integer value to receive the result:
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* 0=low value; 1=high value.
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*/
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#define GPIO_WRITE _GPIOC(1)
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#define GPIO_READ _GPIOC(2)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* Common interface definition. Must be cast-compatible with struct
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* gpio_input_dev_s and struct gpio_output_dev_s
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*/
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struct gpio_common_dev_s
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{
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bool output;
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uint8_t unused[3];
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};
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/* The interface to a GPIO input pin */
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struct gpio_input_dev_s
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{
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bool output;
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uint8_t unused[3];
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CODE int (*gpin_read)(FAR struct gpio_input_dev_s *dev);
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};
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/* The interface to a GPIO input pin */
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struct gpio_output_dev_s
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{
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bool output;
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uint8_t unused[3];
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CODE int (*gpout_read)(FAR struct gpio_output_dev_s *dev);
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CODE int (*gpout_write)(FAR struct gpio_output_dev_s *dev, int value);
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Name: gpio_input_register
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*
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* Description:
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* Register GPIO input pin device driver.
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*
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****************************************************************************/
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int gpio_input_register(FAR struct gpio_input_dev_s *dev, int minor);
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/****************************************************************************
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* Name: gpio_output_register
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*
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* Description:
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* Register GPIO output pin device driver.
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*
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****************************************************************************/
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int gpio_output_register(FAR struct gpio_output_dev_s *dev, int minor);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_NUTTX_IOEXPANDER_GPIO_H */
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@ -1,4 +1,4 @@
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/********************************************************************************************
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/****************************************************************************
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* include/nuttx/ioexpander/pca9555.h
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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|
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@ -35,20 +35,31 @@
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
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********************************************************************************************/
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_IOEXPANDER_PCA9555_H
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#define __INCLUDE_NUTTX_IOEXPANDER_PCA9555_H
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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 <nuttx/i2c/i2c_master.h>
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/* A reference to a structure of this type must be passed to the PCA9555 driver when the
|
||||
* driver is instantiated. This structure provides information about the configuration of
|
||||
* the PCA9555 and provides some board-specific hooks.
|
||||
/****************************************************************************
|
||||
* Public Types
|
||||
****************************************************************************/
|
||||
|
||||
/* A reference to a structure of this type must be passed to the PCA9555
|
||||
* driver when the driver is instantiated. This structure provides
|
||||
* information about the configuration of the PCA9555 and provides some
|
||||
* board-specific hooks.
|
||||
*
|
||||
* Memory for this structure is provided by the caller. It is not copied by the driver
|
||||
* and is presumed to persist while the driver is active. The memory must be writeable
|
||||
* because, under certain circumstances, the driver may modify the frequency.
|
||||
* Memory for this structure is provided by the caller. It is not copied by
|
||||
* the driver and is presumed to persist while the driver is active. The
|
||||
* memory must be writeable because, under certain circumstances, the driver
|
||||
* may modify the frequency.
|
||||
*/
|
||||
|
||||
struct pca9555_config_s
|
||||
|
|
@ -81,9 +92,9 @@ struct pca9555_config_s
|
|||
#endif
|
||||
};
|
||||
|
||||
/********************************************************************************************
|
||||
/****************************************************************************
|
||||
* Public Function Prototypes
|
||||
********************************************************************************************/
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef __cplusplus
|
||||
#define EXTERN extern "C"
|
||||
|
|
@ -93,11 +104,12 @@ extern "C"
|
|||
#define EXTERN extern
|
||||
#endif
|
||||
|
||||
/********************************************************************************************
|
||||
/****************************************************************************
|
||||
* Name: pca9555_initialize
|
||||
*
|
||||
* Description:
|
||||
* Instantiate and configure the PCA9555 device driver to use the provided I2C device
|
||||
* Instantiate and configure the PCA9555 device driver to use the provided
|
||||
* I2C device
|
||||
* instance.
|
||||
*
|
||||
* Input Parameters:
|
||||
|
|
@ -108,9 +120,9 @@ extern "C"
|
|||
* Returned Value:
|
||||
* an ioexpander_dev_s instance on success, NULL on failure.
|
||||
*
|
||||
********************************************************************************************/
|
||||
****************************************************************************/
|
||||
|
||||
FAR struct ioexpander_dev_s* pca9555_initialize(FAR struct i2c_master_s *dev,
|
||||
FAR struct ioexpander_dev_s *pca9555_initialize(FAR struct i2c_master_s *dev,
|
||||
FAR struct pca9555_config_s *config);
|
||||
|
||||
#ifdef __cplusplus
|
||||
|
|
|
|||
Loading…
Reference in New Issue