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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
@@ -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
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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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#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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@@ -35,20 +35,31 @@
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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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#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
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* driver is instantiated. This structure provides information about the configuration of
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* the PCA9555 and provides some board-specific hooks.
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* A reference to a structure of this type must be passed to the PCA9555
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* driver when the driver is instantiated. This structure provides
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* information about the configuration of the PCA9555 and provides some
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* board-specific hooks.
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*
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* Memory for this structure is provided by the caller. It is not copied by the driver
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* and is presumed to persist while the driver is active. The memory must be writeable
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* because, under certain circumstances, the driver may modify the frequency.
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* Memory for this structure is provided by the caller. It is not copied by
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* the driver and is presumed to persist while the driver is active. The
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* memory must be writeable because, under certain circumstances, the driver
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* may modify the frequency.
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*/
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struct pca9555_config_s
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@@ -81,9 +92,9 @@ struct pca9555_config_s
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#endif
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};
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/********************************************************************************************
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/****************************************************************************
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* Public Function Prototypes
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********************************************************************************************/
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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@@ -93,11 +104,12 @@ extern "C"
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#define EXTERN extern
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#endif
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/********************************************************************************************
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/****************************************************************************
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* Name: pca9555_initialize
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*
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* Description:
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* Instantiate and configure the PCA9555 device driver to use the provided I2C device
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* Instantiate and configure the PCA9555 device driver to use the provided
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* I2C device
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* instance.
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*
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* Input Parameters:
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@@ -108,9 +120,9 @@ extern "C"
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* Returned Value:
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* an ioexpander_dev_s instance on success, NULL on failure.
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*
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********************************************************************************************/
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****************************************************************************/
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FAR struct ioexpander_dev_s* pca9555_initialize(FAR struct i2c_master_s *dev,
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FAR struct ioexpander_dev_s *pca9555_initialize(FAR struct i2c_master_s *dev,
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FAR struct pca9555_config_s *config);
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#ifdef __cplusplus
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