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incubator-nuttx/drivers/ioexpander/gpio_lower_half.c

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/****************************************************************************
* drivers/ioexpander/gpio_lower_half.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 <sys/types.h>
#include <assert.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/kmalloc.h>
#include <nuttx/ioexpander/ioexpander.h>
#include <nuttx/ioexpander/gpio.h>
#ifdef CONFIG_GPIO_LOWER_HALF
/****************************************************************************
* Private Types
****************************************************************************/
/* GPIO lower half driver state */
struct gplh_dev_s
{
/* Publicly visible lower-half state */
struct gpio_dev_s gpio;
/* Private lower half data follows */
uint8_t pin; /* I/O expander pin ID */
FAR struct ioexpander_dev_s *ioe; /* Contain I/O expander interface */
#ifdef CONFIG_IOEXPANDER_INT_ENABLE
FAR void *handle; /* Interrupt attach handle */
pin_interrupt_t callback; /* Interrupt callback */
#endif
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
#ifdef CONFIG_IOEXPANDER_INT_ENABLE
static int gplh_handler(FAR struct ioexpander_dev_s *ioe,
ioe_pinset_t pinset, FAR void *arg);
#endif
/* GPIO lower half interface methods */
static int gplh_read(FAR struct gpio_dev_s *gpio, FAR bool *value);
static int gplh_write(FAR struct gpio_dev_s *gpio, bool value);
#ifdef CONFIG_IOEXPANDER_INT_ENABLE
static int gplh_attach(FAR struct gpio_dev_s *gpio,
pin_interrupt_t callback);
static int gplh_enable(FAR struct gpio_dev_s *gpio, bool enable);
#endif
static int gplh_setpintype(FAR struct gpio_dev_s *gpio,
enum gpio_pintype_e pintype);
/****************************************************************************
* Private Data
****************************************************************************/
/* GPIO Lower Half interface operations */
static const struct gpio_operations_s g_gplh_ops =
{
gplh_read, /* read */
gplh_write, /* write */
#ifdef CONFIG_IOEXPANDER_INT_ENABLE
gplh_attach, /* attach */
gplh_enable, /* enable */
#else
NULL, /* attach */
NULL, /* enable */
#endif
gplh_setpintype,
};
/* Identifies the type of the GPIO pin */
static const uint32_t g_gplh_inttype[GPIO_NPINTYPES] =
{
IOEXPANDER_VAL_DISABLE, /* GPIO_INPUT_PIN */
IOEXPANDER_VAL_DISABLE, /* GPIO_INPUT_PIN_PULLUP */
IOEXPANDER_VAL_DISABLE, /* GPIO_INPUT_PIN_PULLDOWN */
IOEXPANDER_VAL_DISABLE, /* GPIO_OUTPUT_PIN */
IOEXPANDER_VAL_DISABLE, /* GPIO_OUTPUT_PIN_OPENDRAIN */
CONFIG_GPIO_LOWER_HALF_INTTYPE, /* GPIO_INTERRUPT_PIN */
IOEXPANDER_VAL_HIGH, /* GPIO_INTERRUPT_HIGH_PIN */
IOEXPANDER_VAL_LOW, /* GPIO_INTERRUPT_LOW_PIN */
IOEXPANDER_VAL_RISING, /* GPIO_INTERRUPT_RISING_PIN */
IOEXPANDER_VAL_FALLING, /* GPIO_INTERRUPT_FALLING_PIN */
IOEXPANDER_VAL_BOTH, /* GPIO_INTERRUPT_BOTH_PIN */
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: gplh_handler
*
* Description:
* I/O expander interrupt callback function.
*
****************************************************************************/
#ifdef CONFIG_IOEXPANDER_INT_ENABLE
static int gplh_handler(FAR struct ioexpander_dev_s *ioe,
ioe_pinset_t pinset, FAR void *arg)
{
FAR struct gplh_dev_s *priv = (FAR struct gplh_dev_s *)arg;
DEBUGASSERT(priv != NULL && priv->callback != NULL);
gpioinfo("pin%u: pinset: %lx callback=%p\n",
priv->pin, (unsigned long)pinset, priv->callback);
/* We received the callback from the I/O expander, forward this to the
* upper half GPIO driver via its callback.
*/
return priv->callback(&priv->gpio, priv->pin);
}
#endif
/****************************************************************************
* Name: gplh_read
*
* Description:
* Read the value of the I/O expander pin.
*
****************************************************************************/
static int gplh_read(FAR struct gpio_dev_s *gpio, FAR bool *value)
{
FAR struct gplh_dev_s *priv = (FAR struct gplh_dev_s *)gpio;
DEBUGASSERT(priv != NULL && priv->ioe != NULL && value != NULL);
gpioinfo("pin%u: value=%p\n", priv->pin, value);
/* Return the value from the I/O expander */
return IOEXP_READPIN(priv->ioe, priv->pin, value);
}
/****************************************************************************
* Name: gplh_write
*
* Description:
* Set the value of an I/O expander output pin
*
****************************************************************************/
static int gplh_write(FAR struct gpio_dev_s *gpio, bool value)
{
FAR struct gplh_dev_s *priv = (FAR struct gplh_dev_s *)gpio;
DEBUGASSERT(priv != NULL && priv->ioe != NULL);
gpioinfo("pin%u: value=%u\n", priv->pin, value);
/* Write the value using the I/O expander */
return IOEXP_WRITEPIN(priv->ioe, priv->pin, value);
}
/****************************************************************************
* Name: gplh_attach
*
* Description:
* Detach and disable any current interrupt on the pin. Save the callback
* information for use when the pin interrupt is enabled.
*
****************************************************************************/
#ifdef CONFIG_IOEXPANDER_INT_ENABLE
static int gplh_attach(FAR struct gpio_dev_s *gpio, pin_interrupt_t callback)
{
FAR struct gplh_dev_s *priv = (FAR struct gplh_dev_s *)gpio;
DEBUGASSERT(priv != NULL && priv->ioe != NULL);
gpioinfo("pin%u: callback=%p\n", priv->pin, callback);
/* Detach and disable any current interrupt on the pin. */
if (priv->handle != NULL)
{
gpioinfo("pin%u: Detaching handle %p\n", priv->pin, priv->handle);
IOEP_DETACH(priv->ioe, priv->handle);
priv->handle = NULL;
}
/* Save the callback function pointer for use when the pin interrupt
* is enabled.
*/
priv->callback = callback;
return OK;
}
#endif
/****************************************************************************
* Name: gplh_enable
*
* Description:
* Enable or disable the I/O expander pin interrupt
*
****************************************************************************/
#ifdef CONFIG_IOEXPANDER_INT_ENABLE
static int gplh_enable(FAR struct gpio_dev_s *gpio, bool enable)
{
FAR struct gplh_dev_s *priv = (FAR struct gplh_dev_s *)gpio;
int ret = OK;
DEBUGASSERT(priv != NULL && priv->ioe != NULL);
gpioinfo("pin%u: %s callback=%p handle=%p\n",
priv->pin, enable ? "Enabling" : "Disabling",
priv->callback, priv->handle);
/* Are we enabling or disabling the pin interrupt? */
if (enable)
{
/* We are enabling the pin interrupt. Make certain that there is
* an interrupt handler already attached.
*/
if (priv->callback == NULL)
{
/* No callback has been attached */
gpiowarn("WARNING: pin%u: Attempt to enable before attaching\n",
priv->pin);
ret = -EPERM;
}
/* Check if the interrupt is already attached and enabled */
else if (priv->handle == NULL)
{
#if CONFIG_IOEXPANDER_NPINS <= 64
ioe_pinset_t pinset = ((ioe_pinset_t)1 << priv->pin);
#else
ioe_pinset_t pinset = ((ioe_pinset_t)priv->pin);
#endif
/* We have a callback and the callback is not yet attached.
* do it now.
*/
gpioinfo("pin%u: Attaching %p\n", priv->pin, priv->callback);
priv->handle = IOEP_ATTACH(priv->ioe, pinset, gplh_handler, priv);
if (priv->handle == NULL)
{
gpioerr("ERROR: pin%u: IOEP_ATTACH() failed\n", priv->pin);
ret = -EIO;
}
}
}
else
{
/* Check if we are already detached */
if (priv->handle == NULL)
{
gpiowarn("WARNING: pin%u: Already detached\n", priv->pin);
}
else
{
gpioinfo("pin%u: Detaching handle=%p\n", priv->pin, priv->handle);
ret = IOEP_DETACH(priv->ioe, priv->handle);
if (ret < 0)
{
gpioerr("ERROR: pin%u: IOEP_DETACH() failed %d\n",
priv->pin, ret);
}
/* We are no longer attached */
priv->handle = NULL;
}
}
return ret;
}
#endif
/****************************************************************************
* Name: gplh_setpintype
*
* Description:
* Set I/O expander pin to an appointed gpiopintype
*
****************************************************************************/
static int gplh_setpintype(FAR struct gpio_dev_s *gpio,
enum gpio_pintype_e pintype)
{
FAR struct gplh_dev_s *priv = (FAR struct gplh_dev_s *)gpio;
FAR struct ioexpander_dev_s *ioe = priv->ioe;
uint8_t pin = priv->pin;
if (pintype >= GPIO_NPINTYPES)
{
return -EINVAL;
}
else if (pintype == GPIO_OUTPUT_PIN)
{
IOEXP_SETDIRECTION(ioe, pin, IOEXPANDER_DIRECTION_OUT);
}
else if (pintype == GPIO_OUTPUT_PIN_OPENDRAIN)
{
IOEXP_SETDIRECTION(ioe, pin, IOEXPANDER_DIRECTION_OUT_OPENDRAIN);
}
else
{
if (pintype == GPIO_INPUT_PIN)
{
IOEXP_SETDIRECTION(ioe, pin, IOEXPANDER_DIRECTION_IN);
}
else if (pintype == GPIO_INPUT_PIN_PULLUP)
{
IOEXP_SETDIRECTION(ioe, pin, IOEXPANDER_DIRECTION_IN_PULLUP);
}
else
{
IOEXP_SETDIRECTION(ioe, pin, IOEXPANDER_DIRECTION_IN_PULLDOWN);
}
IOEXP_SETOPTION(ioe, pin, IOEXPANDER_OPTION_INTCFG,
(FAR void *)(uintptr_t)g_gplh_inttype[pintype]);
}
gpio->gp_pintype = pintype;
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: gpio_lower_half
*
* Description:
* Create a GPIO pin device driver instance for an I/O expander pin.
* The I/O expander pin must have already been configured by the caller
* for the particular pintype.
*
* Input Parameters:
* ioe - An instance of the I/O expander interface
* pin - The I/O expander pin number for the driver
* pintype - See enum gpio_pintype_e
* minor - The minor device number to use when registering the device
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int gpio_lower_half(FAR struct ioexpander_dev_s *ioe, unsigned int pin,
enum gpio_pintype_e pintype, int minor)
{
FAR struct gplh_dev_s *priv;
FAR struct gpio_dev_s *gpio;
int ret;
DEBUGASSERT(ioe != NULL && pin < CONFIG_IOEXPANDER_NPINS &&
(unsigned int)pintype < GPIO_NPINTYPES);
#ifndef CONFIG_IOEXPANDER_INT_ENABLE
/* If there is no I/O expander interrupt support, then we cannot handle
* interrupting pin types.
*/
DEBUGASSERT(pintype < GPIO_INTERRUPT_PIN);
#endif
/* Allocate an new instance of the GPIO lower half driver */
priv = (FAR struct gplh_dev_s *)kmm_zalloc(sizeof(struct gplh_dev_s));
if (priv == NULL)
{
gpioerr("ERROR: Failed to allocate driver state\n");
return -ENOMEM;
}
/* Initialize the non-zero elements of the newly allocated instance */
priv->pin = (uint8_t)pin;
priv->ioe = ioe;
gpio = &priv->gpio;
gpio->gp_ops = &g_gplh_ops;
/* Set pintype */
ret = gplh_setpintype(gpio, pintype);
if (ret < 0)
{
gpioerr("ERROR: gplh_setpintype() failed: %d\n", ret);
kmm_free(priv);
return ret;
}
/* Register the GPIO driver */
ret = gpio_pin_register(gpio, minor);
if (ret < 0)
{
gpioerr("ERROR: gpio_pin_register() failed: %d\n", ret);
kmm_free(priv);
}
return ret;
}
#endif /* CONFIG_GPIO_LOWER_HALF */
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