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/*
* Copyright (c) 2015-2016 Intel Corporation.
*
* Licensed 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.
*/
/**
* @file
* @brief Public APIs for GPIO drivers
*/
#ifndef __GPIO_H__
#define __GPIO_H__
#include <misc/__assert.h>
#include <misc/slist.h>
#include <stdint.h>
#include <stddef.h>
#include <device.h>
/**
* @brief GPIO Driver APIs
* @defgroup gpio_interface GPIO Driver APIs
* @ingroup io_interfaces
* @{
*/
#ifdef __cplusplus
extern "C" {
#endif
/** @cond INTERNAL_HIDDEN */
#define GPIO_ACCESS_BY_PIN 0
#define GPIO_ACCESS_BY_PORT 1
/** @endcond */
/** GPIO pin to be input. */
#define GPIO_DIR_IN (0 << 0)
/** GPIO pin to be output. */
#define GPIO_DIR_OUT (1 << 0)
/** @cond INTERNAL_HIDDEN */
#define GPIO_DIR_MASK 0x1
/** @endcond */
/** GPIO pin to trigger interrupt. */
#define GPIO_INT (1 << 1)
/** GPIO pin trigger on level low or falling edge. */
#define GPIO_INT_ACTIVE_LOW (0 << 2)
/** GPIO pin trigger on level high or rising edge. */
#define GPIO_INT_ACTIVE_HIGH (1 << 2)
/** GPIO pin trggier to be synchronized to clock pulses. */
#define GPIO_INT_CLOCK_SYNC (1 << 3)
/** Enable GPIO pin debounce. */
#define GPIO_INT_DEBOUNCE (1 << 4)
/** Do Level trigger. */
#define GPIO_INT_LEVEL (0 << 5)
/** Do Edge trigger. */
#define GPIO_INT_EDGE (1 << 5)
/** Interrupt triggers on both rising and falling edge. */
#define GPIO_INT_DOUBLE_EDGE (1 << 6)
/*
* GPIO_POL_* define the polarity of the GPIO (1 bit).
*/
/** @cond INTERNAL_HIDDEN */
#define GPIO_POL_POS 7
/** @endcond */
/** GPIO pin polarity is normal. */
#define GPIO_POL_NORMAL (0 << GPIO_POL_POS)
/** GPIO pin polarity is inverted. */
#define GPIO_POL_INV (1 << GPIO_POL_POS)
/** @cond INTERNAL_HIDDEN */
#define GPIO_POL_MASK (1 << GPIO_POL_POS)
/** @endcond */
/*
* GPIO_PUD_* are related to pull-up/pull-down.
*/
/** @cond INTERNAL_HIDDEN */
#define GPIO_PUD_POS 8
/** @endcond */
/** GPIO pin to have no pull-up or pull-down. */
#define GPIO_PUD_NORMAL (0 << GPIO_PUD_POS)
/** Enable GPIO pin pull-up. */
#define GPIO_PUD_PULL_UP (1 << GPIO_PUD_POS)
/** Enable GPIO pin pull-down. */
#define GPIO_PUD_PULL_DOWN (2 << GPIO_PUD_POS)
/** @cond INTERNAL_HIDDEN */
#define GPIO_PUD_MASK (3 << GPIO_PUD_POS)
/** @endcond */
/*
* GPIO_PIN_(EN-/DIS-)ABLE are for pin enable / disable.
*
* Individual pins can be enabled or disabled
* if the controller supports this operation.
*/
/** Enable GPIO pin. */
#define GPIO_PIN_ENABLE (1 << 10)
/** Disable GPIO pin. */
#define GPIO_PIN_DISABLE (1 << 11)
struct gpio_callback;
/**
* @typedef gpio_callback_handler_t
* @brief Define the application callback handler function signature
*
* @param "struct device *port" Device struct for the GPIO device.
* @param "struct gpio_callback *cb" Original struct gpio_callback
* owning this handler
* @param "uint32_t pins" Mask of pins that triggers the callback handler
*
* Note: cb pointer can be used to retrieve private data through
* CONTAINER_OF() if original struct gpio_callback is stored in
* another private structure.
*/
typedef void (*gpio_callback_handler_t)(struct device *port,
struct gpio_callback *cb,
uint32_t pins);
/**
* @brief GPIO callback structure
*
* Used to register a callback in the driver instance callback list.
* As many callbacks as needed can be added as long as each of them
* are unique pointers of struct gpio_callback.
* Beware such structure should not be allocated on stack.
*
* Note: To help setting it, see gpio_init_callback() below
*/
struct gpio_callback {
/** This is meant to be used in the driver and the user should not
* mess with it (see drivers/gpio/gpio_utils.h)
*/
sys_snode_t node;
/** Actual callback function being called when relevant. */
gpio_callback_handler_t handler;
/** A mask of pins the callback is interested in, if 0 the callback
* will never be called. Such pin_mask can be modified whenever
* necessary by the owner, and thus will affect the handler being
* called or not. The selected pins must be configured to trigger
* an interrupt.
*/
uint32_t pin_mask;
};
/**
* @cond INTERNAL_HIDDEN
*
* GPIO driver API definition.
*
* (Internal use only.)
*/
typedef int (*gpio_config_t)(struct device *port, int access_op,
uint32_t pin, int flags);
typedef int (*gpio_write_t)(struct device *port, int access_op,
uint32_t pin, uint32_t value);
typedef int (*gpio_read_t)(struct device *port, int access_op,
uint32_t pin, uint32_t *value);
typedef int (*gpio_manage_callback_t)(struct device *port,
struct gpio_callback *callback,
bool set);
typedef int (*gpio_enable_callback_t)(struct device *port,
int access_op,
uint32_t pin);
typedef int (*gpio_disable_callback_t)(struct device *port,
int access_op,
uint32_t pin);
typedef uint32_t (*gpio_api_get_pending_int)(struct device *dev);
struct gpio_driver_api {
gpio_config_t config;
gpio_write_t write;
gpio_read_t read;
gpio_manage_callback_t manage_callback;
gpio_enable_callback_t enable_callback;
gpio_disable_callback_t disable_callback;
gpio_api_get_pending_int get_pending_int;
};
/**
* @endcond
*/
/**
* @brief Configure a single pin.
* @param port Pointer to device structure for the driver instance.
* @param pin Pin number to configure.
* @param flags Flags for pin configuration. IN/OUT, interrupt ...
* @return 0 if successful, negative errno code on failure.
*/
static inline int gpio_pin_configure(struct device *port, uint8_t pin,
int flags)
{
const struct gpio_driver_api *api = port->driver_api;
return api->config(port, GPIO_ACCESS_BY_PIN, pin, flags);
}
/**
* @brief Write the data value to a single pin.
* @param port Pointer to the device structure for the driver instance.
* @param pin Pin number where the data is written.
* @param value Value set on the pin.
* @return 0 if successful, negative errno code on failure.
*/
static inline int gpio_pin_write(struct device *port, uint32_t pin,
uint32_t value)
{
const struct gpio_driver_api *api = port->driver_api;
return api->write(port, GPIO_ACCESS_BY_PIN, pin, value);
}
/**
* @brief Read the data value of a single pin.
* @param port Pointer to the device structure for the driver instance.
* @param pin Pin number where data is read.
* @param value Integer pointer to receive the data values from the pin.
* @return 0 if successful, negative errno code on failure.
*/
static inline int gpio_pin_read(struct device *port, uint32_t pin,
uint32_t *value)
{
const struct gpio_driver_api *api = port->driver_api;
return api->read(port, GPIO_ACCESS_BY_PIN, pin, value);
}
/**
* @brief Helper to initialize a struct gpio_callback properly
* @param callback A valid Application's callback structure pointer.
* @param handler A valid handler function pointer.
* @param pin_mask A bit mask of relevant pins for the handler
*/
static inline void gpio_init_callback(struct gpio_callback *callback,
gpio_callback_handler_t handler,
uint32_t pin_mask)
{
__ASSERT(callback, "Callback pointer should not be NULL");
__ASSERT(handler, "Callback handler pointer should not be NULL");
callback->handler = handler;
callback->pin_mask = pin_mask;
}
/**
* @brief Add an application callback.
* @param port Pointer to the device structure for the driver instance.
* @param callback A valid Application's callback structure pointer.
* @return 0 if successful, negative errno code on failure.
*
* Note: enables to add as many callback as needed on the same port.
*/
static inline int gpio_add_callback(struct device *port,
struct gpio_callback *callback)
{
const struct gpio_driver_api *api = port->driver_api;
__ASSERT(callback, "Callback pointer should not be NULL");
return api->manage_callback(port, callback, true);
}
/**
* @brief Remove an application callback.
* @param port Pointer to the device structure for the driver instance.
* @param callback A valid application's callback structure pointer.
* @return 0 if successful, negative errno code on failure.
*
* Note: enables to remove as many callbacks as added through
* gpio_add_callback().
*/
static inline int gpio_remove_callback(struct device *port,
struct gpio_callback *callback)
{
const struct gpio_driver_api *api = port->driver_api;
__ASSERT(callback, "Callback pointer should not be NULL");
return api->manage_callback(port, callback, false);
}
/**
* @brief Enable callback(s) for a single pin.
* @param port Pointer to the device structure for the driver instance.
* @param pin Pin number where the callback function is enabled.
* @return 0 if successful, negative errno code on failure.
*
* Note: Depending on the driver implementation, this function will enable
* the pin to trigger an interruption. So as a semantic detail, if no
* callback is registered, of course none will be called.
*/
static inline int gpio_pin_enable_callback(struct device *port, uint32_t pin)
{
const struct gpio_driver_api *api = port->driver_api;
return api->enable_callback(port, GPIO_ACCESS_BY_PIN, pin);
}
/**
* @brief Disable callback(s) for a single pin.
* @param port Pointer to the device structure for the driver instance.
* @param pin Pin number where the callback function is disabled.
* @return 0 if successful, negative errno code on failure.
*/
static inline int gpio_pin_disable_callback(struct device *port, uint32_t pin)
{
const struct gpio_driver_api *api = port->driver_api;
return api->disable_callback(port, GPIO_ACCESS_BY_PIN, pin);
}
/**
* @brief Configure all the pins the same way in the port.
* List out all flags on the detailed description.
*
* @param port Pointer to the device structure for the driver instance.
* @param flags Flags for the port configuration. IN/OUT, interrupt ...
* @return 0 if successful, negative errno code on failure.
*/
static inline int gpio_port_configure(struct device *port, int flags)
{
const struct gpio_driver_api *api = port->driver_api;
return api->config(port, GPIO_ACCESS_BY_PORT, 0, flags);
}
/**
* @brief Write a data value to the port.
* @param port Pointer to the device structure for the driver instance.
* @param value Value to set on the port.
* @return 0 if successful, negative errno code on failure.
*/
static inline int gpio_port_write(struct device *port, uint32_t value)
{
const struct gpio_driver_api *api = port->driver_api;
return api->write(port, GPIO_ACCESS_BY_PORT, 0, value);
}
/**
* @brief Read data value from the port.
* @param port Pointer to the device structure for the driver instance.
* @param value Integer pointer to receive the data value from the port.
* @return 0 if successful, negative errno code on failure.
*/
static inline int gpio_port_read(struct device *port, uint32_t *value)
{
const struct gpio_driver_api *api = port->driver_api;
return api->read(port, GPIO_ACCESS_BY_PORT, 0, value);
}
/**
* @brief Enable callback(s) for the port.
* @param port Pointer to the device structure for the driver instance.
* @return 0 if successful, negative errno code on failure.
*
* Note: Depending on the driver implementation, this function will enable
* the port to trigger an interruption on all pins, as long as these
* are configured properly. So as a semantic detail, if no callback
* is registered, of course none will be called.
*/
static inline int gpio_port_enable_callback(struct device *port)
{
const struct gpio_driver_api *api = port->driver_api;
return api->enable_callback(port, GPIO_ACCESS_BY_PORT, 0);
}
/**
* @brief Disable callback(s) for the port.
* @param port Pointer to the device structure for the driver instance.
* @return 0 if successful, negative errno code on failure.
*/
static inline int gpio_port_disable_callback(struct device *port)
{
const struct gpio_driver_api *api = port->driver_api;
return api->disable_callback(port, GPIO_ACCESS_BY_PORT, 0);
}
/**
* @brief Function to get pending interrupts
*
* The purpose of this function is to return the interrupt
* status register for the device.
* This is especially useful when waking up from
* low power states to check the wake up source.
*
* @param dev Pointer to the device structure for the driver instance.
*
* @retval status != 0 if at least one gpio interrupt is pending.
* @retval 0 if no gpio interrupt is pending.
*/
static inline int gpio_get_pending_int(struct device *dev)
{
struct gpio_driver_api *api;
api = (struct gpio_driver_api *)dev->driver_api;
return api->get_pending_int(dev);
}
struct gpio_pin_config {
char *gpio_controller;
uint32_t gpio_pin;
};
#define GPIO_DECLARE_PIN_CONFIG_IDX(_idx) \
struct gpio_pin_config gpio_pin_ ##_idx
#define GPIO_DECLARE_PIN_CONFIG \
GPIO_DECLARE_PIN_CONFIG_IDX()
#define GPIO_PIN_IDX(_idx, _controller, _pin) \
.gpio_pin_ ##_idx = { \
.gpio_controller = (_controller),\
.gpio_pin = (_pin), \
}
#define GPIO_PIN(_controller, _pin) \
GPIO_PIN_IDX(, _controller, _pin)
#define GPIO_GET_CONTROLLER_IDX(_idx, _conf) \
((_conf)->gpio_pin_ ##_idx.gpio_controller)
#define GPIO_GET_PIN_IDX(_idx, _conf) \
((_conf)->gpio_pin_ ##_idx.gpio_pin)
#define GPIO_GET_CONTROLLER(_conf) GPIO_GET_CONTROLLER_IDX(, _conf)
#define GPIO_GET_PIN(_conf) GPIO_GET_PIN_IDX(, _conf)
#ifdef __cplusplus
}
#endif
/**
* @}
*/
#endif /* __GPIO_H__ */