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incubator-nuttx/drivers/ioexpander/iso1h812g.c

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/****************************************************************************
* drivers/ioexpander/iso1h812g.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <sys/param.h>
#include <nuttx/kmalloc.h>
#include <nuttx/arch.h>
#include <nuttx/spi/spi.h>
#include <nuttx/ioexpander/ioexpander.h>
#include <nuttx/ioexpander/iso1h812g.h>
#include "iso1h812g.h"
#ifdef CONFIG_IOEXPANDER_ISO1H812G
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
struct iso1h812g_dev_s
{
struct ioexpander_dev_s dev; /* Nested structure to allow casting as public gpio
* expander. */
FAR struct iso1h812g_config_s *config; /* Board configuration data */
FAR struct spi_dev_s *spi; /* Saved SPI driver instance */
uint8_t outstate;
mutex_t lock;
};
/****************************************************************************
* Private Function Protototypes
****************************************************************************/
/* SPI helpers */
static void iso1h812g_select(FAR struct spi_dev_s *spi,
FAR struct iso1h812g_config_s *config,
int bits);
static void iso1h812g_deselect(FAR struct spi_dev_s *spi,
FAR struct iso1h812g_config_s *config);
/* I/O Expander Methods */
static int iso1h812g_direction(FAR struct ioexpander_dev_s *dev, uint8_t pin,
int dir);
static int iso1h812g_option(FAR struct ioexpander_dev_s *dev, uint8_t pin,
int opt, void *regval);
static int iso1h812g_writepin(FAR struct ioexpander_dev_s *dev, uint8_t pin,
bool value);
static int iso1h812g_readpin(FAR struct ioexpander_dev_s *dev, uint8_t pin,
FAR bool *value);
#ifdef CONFIG_IOEXPANDER_MULTIPIN
static int iso1h812g_multiwritepin(FAR struct ioexpander_dev_s *dev,
FAR const uint8_t *pins, FAR const bool *values, int count);
static int iso1h812g_multireadpin(FAR struct ioexpander_dev_s *dev,
FAR const uint8_t *pins, FAR bool *values, int count);
#endif
/****************************************************************************
* Private Data
****************************************************************************/
#ifndef CONFIG_ISO1H812G_MULTIPLE
/* If only a single device is supported, then the driver state structure may
* as well be pre-allocated.
*/
static struct iso1h812g_dev_s g_iso1h812g;
#endif
/* I/O expander vtable */
static const struct ioexpander_ops_s g_iso1h812g_ops =
{
iso1h812g_direction,
iso1h812g_option,
iso1h812g_writepin,
iso1h812g_readpin,
iso1h812g_readpin
#ifdef CONFIG_IOEXPANDER_MULTIPIN
, iso1h812g_multiwritepin
, iso1h812g_multireadpin
, iso1h812g_multireadpin
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: iso1h812g_select
*
* Description:
* Select the SPI, locking and re-configuring if necessary
*
* Input Parameters:
* spi - Reference to the SPI driver structure
* bits - Number of SPI bits
*
* Returned Value:
* None
*
****************************************************************************/
static void iso1h812g_select(FAR struct spi_dev_s *spi,
FAR struct iso1h812g_config_s *config, int bits)
{
/* Select ISO1H812G chip (locking the SPI bus in case there are multiple
* devices competing for the SPI bus
*/
SPI_LOCK(spi, true);
SPI_SELECT(spi, SPIDEV_EXPANDER(config->id), true);
/* Now make sure that the SPI bus is configured for the ISO1H812G (it
* might have gotten configured for a different device while unlocked)
*/
SPI_SETMODE(spi, config->mode);
SPI_SETBITS(spi, bits);
SPI_SETFREQUENCY(spi, config->frequency);
}
/****************************************************************************
* Name: iso1h812g_deselect
*
* Description:
* De-select the SPI
*
* Input Parameters:
* spi - Reference to the SPI driver structure
*
* Returned Value:
* None
*
****************************************************************************/
static void iso1h812g_deselect(FAR struct spi_dev_s *spi,
FAR struct iso1h812g_config_s *config)
{
/* De-select ISO1H812G chip and relinquish the SPI bus. */
SPI_SELECT(spi, SPIDEV_EXPANDER(config->id), false);
SPI_LOCK(spi, false);
}
/****************************************************************************
* Name: iso1h812g_direction
*
* Description:
* ISO1H812G is only input pin. However interface is provided in order
* to avoid system falls if called.
*
* Input Parameters:
* dev - Device-specific state data
* pin - The index of the pin to alter in this call
* dir - One of the IOEXPANDER_DIRECTION_ macros
*
* Returned Value:
* 0 on success, else a negative error code
*
****************************************************************************/
static int iso1h812g_direction(FAR struct ioexpander_dev_s *dev,
uint8_t pin, int direction)
{
FAR struct iso1h812g_dev_s *priv = (FAR struct iso1h812g_dev_s *)dev;
DEBUGASSERT(priv != NULL && priv->config != NULL);
gpiowarn("WARNING: ISO1H812G is only input expander!\n");
return OK;
}
/****************************************************************************
* Name: iso1h812g_option
*
* Description:
* Set pin options. Required.
* Since all IO expanders have various pin options, this API allows setting
* pin options in a flexible way.
*
* Input Parameters:
* dev - Device-specific state data
* pin - The index of the pin to alter in this call
* opt - One of the IOEXPANDER_OPTION_ macros
* val - The option's value
*
* Returned Value:
* 0 on success, else a negative error code
*
****************************************************************************/
static int iso1h812g_option(FAR struct ioexpander_dev_s *dev, uint8_t pin,
int opt, FAR void *value)
{
gpiowarn("WARNING: ISO1H812G does not have options!\n");
return OK;
}
/****************************************************************************
* Name: iso1h812g_writepin
*
* Description:
* Set the pin level. Required.
*
* Input Parameters:
* dev - Device-specific state data
* pin - The index of the pin to alter in this call
* val - The pin level. Usually TRUE will set the pin high,
* except if OPTION_INVERT has been set on this pin.
*
* Returned Value:
* 0 on success, else a negative error code
*
****************************************************************************/
static int iso1h812g_writepin(FAR struct ioexpander_dev_s *dev, uint8_t pin,
bool value)
{
FAR struct iso1h812g_dev_s *priv = (FAR struct iso1h812g_dev_s *)dev;
int ret;
if (pin > 7)
{
return -ENXIO;
}
DEBUGASSERT(priv != NULL && priv->config != NULL);
gpioinfo("Expander id=%02x, pin=%u\n", priv->config->id, pin);
/* Get exclusive access to the I/O Expander */
ret = nxmutex_lock(&priv->lock);
if (ret < 0)
{
return ret;
}
/* Set/clear a bit in outstate. */
if (value)
{
priv->outstate |= (1 << pin);
}
else
{
priv->outstate &= ~(1 << pin);
}
iso1h812g_select(priv->spi, priv->config, 8);
SPI_SEND(priv->spi, priv->outstate);
iso1h812g_deselect(priv->spi, priv->config);
nxmutex_unlock(&priv->lock);
return ret;
}
/****************************************************************************
* Name: iso1h812g_readpin
*
* Description:
* Read the actual PIN level. This can be different from the last value
* written to this pin. Required.
*
* Input Parameters:
* dev - Device-specific state data
* pin - The index of the pin
* valptr - Pointer to a buffer where the pin level is stored. Usually TRUE
* if the pin is high, except if OPTION_INVERT has been set on
* this pin.
*
* Returned Value:
* 0 on success, else a negative error code
*
****************************************************************************/
static int iso1h812g_readpin(FAR struct ioexpander_dev_s *dev, uint8_t pin,
FAR bool *value)
{
gpiowarn("WARNING: ISO1H812G is only output expander!\n");
return OK;
}
/****************************************************************************
* Name: iso1h812g_multiwritepin
*
* Description:
* Set the pin level for multiple pins. This routine may be faster than
* individual pin accesses. Optional.
*
* Input Parameters:
* dev - Device-specific state data
* pins - The list of pin indexes to alter in this call
* val - The list of pin levels.
*
* Returned Value:
* 0 on success, else a negative error code
*
****************************************************************************/
#ifdef CONFIG_IOEXPANDER_MULTIPIN
static int iso1h812g_multiwritepin(FAR struct ioexpander_dev_s *dev,
FAR const uint8_t *pins,
FAR const bool *values, int count)
{
FAR struct iso1h812g_dev_s *priv = (FAR struct iso1h812g_dev_s *)dev;
int ret;
uint8_t pin;
int i;
DEBUGASSERT(priv != NULL && priv->config != NULL && values != NULL);
/* Get exclusive access to the I/O Expander */
ret = nxmutex_lock(&priv->lock);
if (ret < 0)
{
return ret;
}
/* Set/clear a bit in outstate. */
for (i = 0; i < count; i++)
{
pin = pins[i];
gpioinfo("Expander id=%02x, pin=%u\n", priv->config->id, pin);
if (pin > 7)
{
return -ENXIO;
}
if (values[i])
{
priv->outstate |= (1 << pin);
}
else
{
priv->outstate &= ~(1 << pin);
}
}
iso1h812g_select(priv->spi, priv->config, 8);
SPI_SEND(priv->spi, priv->outstate);
iso1h812g_deselect(priv->spi, priv->config);
nxmutex_unlock(&priv->lock);
return ret;
}
/****************************************************************************
* Name: iso1h812g_multireadpin
*
* Description:
* Read the actual level for multiple pins. This routine may be faster than
* individual pin accesses. Optional.
*
* Input Parameters:
* dev - Device-specific state data
* pin - The list of pin indexes to read
* valptr - Pointer to a buffer where the pin levels are stored.
*
* Returned Value:
* 0 on success, else a negative error code
*
****************************************************************************/
static int iso1h812g_multireadpin(FAR struct ioexpander_dev_s *dev,
FAR const uint8_t *pins, FAR bool *values,
int count)
{
gpiowarn("WARNING: ISO1H812G is only output expander!\n");
return OK;
}
#endif /* CONFIG_IOEXPANDER_MULTIPIN */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: iso1h812g_initialize
*
* Description:
* Instantiate and configure the ISO1H812Gxx device driver to use the
* provided SPI device instance.
*
* Input Parameters:
* spi - A SPI driver instance
* config - Persistent board configuration data
*
* Returned Value:
* an ioexpander_dev_s instance on success, NULL on failure.
*
****************************************************************************/
FAR struct ioexpander_dev_s *iso1h812g_initialize(FAR struct spi_dev_s *spi,
FAR struct iso1h812g_config_s *config)
{
FAR struct iso1h812g_dev_s *priv;
#ifdef CONFIG_ISO1H812G_MULTIPLE
/* Allocate the device state structure */
priv = kmm_zalloc(sizeof(struct iso1h812g_dev_s));
if (!priv)
{
gpioerr("ERROR: Failed to allocate driver instance\n");
return NULL;
}
#else
/* Use the one-and-only I/O Expander driver instance */
priv = &g_iso1h812g;
#endif
/* Initialize the device state structure */
priv->dev.ops = &g_iso1h812g_ops;
priv->spi = spi;
priv->config = config;
priv->outstate = 0;
nxmutex_init(&priv->lock);
return &priv->dev;
}
#endif /* CONFIG_IOEXPANDER_ISO1H812G */
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