rt-thread-official/bsp/imxrt/libraries/MIMXRT1170/MIMXRT1176/utilities/fsl_notifier.h

238 lines
11 KiB
C

/*
* Copyright (c) 2015, Freescale Semiconductor, Inc.
* Copyright 2016-2017 NXP
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef _FSL_NOTIFIER_H_
#define _FSL_NOTIFIER_H_
#include "fsl_common.h"
/*!
* @addtogroup notifier
* @{
*/
/*******************************************************************************
* Definitions
******************************************************************************/
/*!
* @brief Notifier error codes.
*
* Used as return value of Notifier functions.
*/
enum _notifier_status
{
kStatus_NOTIFIER_ErrorNotificationBefore =
MAKE_STATUS(kStatusGroup_NOTIFIER, 0), /*!< An error occurs during send "BEFORE" notification. */
kStatus_NOTIFIER_ErrorNotificationAfter =
MAKE_STATUS(kStatusGroup_NOTIFIER, 1), /*!< An error occurs during send "AFTER" notification. */
};
/*!
* @brief Notifier policies.
*
* Defines whether the user function execution is forced or not.
* For kNOTIFIER_PolicyForcible, the user function is executed regardless of the callback results,
* while kNOTIFIER_PolicyAgreement policy is used to exit NOTIFIER_SwitchConfig()
* when any of the callbacks returns error code.
* See also NOTIFIER_SwitchConfig() description.
*/
typedef enum _notifier_policy
{
kNOTIFIER_PolicyAgreement, /*!< NOTIFIER_SwitchConfig() method is exited when any of the callbacks returns error
code. */
kNOTIFIER_PolicyForcible, /*!< The user function is executed regardless of the results. */
} notifier_policy_t;
/*! @brief Notification type. Used to notify registered callbacks */
typedef enum _notifier_notification_type
{
kNOTIFIER_NotifyRecover = 0x00U, /*!< Notify IP to recover to previous work state. */
kNOTIFIER_NotifyBefore = 0x01U, /*!< Notify IP that configuration setting is going to change. */
kNOTIFIER_NotifyAfter = 0x02U, /*!< Notify IP that configuration setting has been changed. */
} notifier_notification_type_t;
/*!
* @brief The callback type, which indicates kinds of notification the callback handles.
*
* Used in the callback configuration structure (notifier_callback_config_t)
* to specify when the registered callback is called during configuration switch initiated by the
* NOTIFIER_SwitchConfig().
* Callback can be invoked in following situations.
* - Before the configuration switch (Callback return value can affect NOTIFIER_SwitchConfig()
* execution. See the NOTIFIER_SwitchConfig() and notifier_policy_t documentation).
* - After an unsuccessful attempt to switch configuration
* - After a successful configuration switch
*/
typedef enum _notifier_callback_type
{
kNOTIFIER_CallbackBefore = 0x01U, /*!< Callback handles BEFORE notification. */
kNOTIFIER_CallbackAfter = 0x02U, /*!< Callback handles AFTER notification. */
kNOTIFIER_CallbackBeforeAfter = 0x03U, /*!< Callback handles BEFORE and AFTER notification. */
} notifier_callback_type_t;
/*! @brief Notifier user configuration type.
*
* Reference of the user defined configuration is stored in an array; the notifier switches between these configurations
* based on this array.
*/
typedef void notifier_user_config_t;
/*! @brief Notifier user function prototype
* Use this function to execute specific operations in configuration switch.
* Before and after this function execution, different notification is sent to registered callbacks.
* If this function returns any error code, NOTIFIER_SwitchConfig() exits.
*
* @param targetConfig target Configuration.
* @param userData Refers to other specific data passed to user function.
* @return An error code or kStatus_Success.
*/
typedef status_t (*notifier_user_function_t)(notifier_user_config_t *targetConfig, void *userData);
/*! @brief notification block passed to the registered callback function. */
typedef struct _notifier_notification_block
{
notifier_user_config_t *targetConfig; /*!< Pointer to target configuration. */
notifier_policy_t policy; /*!< Configure transition policy. */
notifier_notification_type_t notifyType; /*!< Configure notification type. */
} notifier_notification_block_t;
/*!
* @brief Callback prototype.
*
* Declaration of a callback. It is common for registered callbacks.
* Reference to function of this type is part of the notifier_callback_config_t callback configuration structure.
* Depending on callback type, function of this prototype is called (see NOTIFIER_SwitchConfig())
* before configuration switch, after it or in both use cases to notify about
* the switch progress (see notifier_callback_type_t). When called, the type of the notification
* is passed as a parameter along with the reference to the target configuration structure (see
* notifier_notification_block_t) and any data passed during the callback registration. When notified before the
* configuration switch, depending on the configuration switch policy (see notifier_policy_t), the callback may deny the
* execution of the user function by returning an error code different than kStatus_Success (see
* NOTIFIER_SwitchConfig()).
*
* @param notify Notification block.
* @param data Callback data. Refers to the data passed during callback registration. Intended to
* pass any driver or application data such as internal state information.
* @return An error code or kStatus_Success.
*/
typedef status_t (*notifier_callback_t)(notifier_notification_block_t *notify, void *data);
/*!
* @brief Callback configuration structure.
*
* This structure holds the configuration of callbacks.
* Callbacks of this type are expected to be statically allocated.
* This structure contains the following application-defined data.
* callback - pointer to the callback function
* callbackType - specifies when the callback is called
* callbackData - pointer to the data passed to the callback.
*/
typedef struct _notifier_callback_config
{
notifier_callback_t callback; /*!< Pointer to the callback function. */
notifier_callback_type_t callbackType; /*!< Callback type. */
void *callbackData; /*!< Pointer to the data passed to the callback. */
} notifier_callback_config_t;
/*!
* @brief Notifier handle structure.
*
* Notifier handle structure. Contains data necessary for the Notifier proper function.
* Stores references to registered configurations, callbacks, information about their numbers,
* user function, user data, and other internal data.
* NOTIFIER_CreateHandle() must be called to initialize this handle.
*/
typedef struct _notifier_handle
{
notifier_user_config_t **configsTable; /*!< Pointer to configure table. */
uint8_t configsNumber; /*!< Number of configurations. */
notifier_callback_config_t *callbacksTable; /*!< Pointer to callback table. */
uint8_t callbacksNumber; /*!< Maximum number of callback configurations. */
uint8_t errorCallbackIndex; /*!< Index of callback returns error. */
uint8_t currentConfigIndex; /*!< Index of current configuration. */
notifier_user_function_t userFunction; /*!< User function. */
void *userData; /*!< User data passed to user function. */
} notifier_handle_t;
/*******************************************************************************
* API
******************************************************************************/
#if defined(__cplusplus)
extern "C" {
#endif
/*!
* @brief Creates a Notifier handle.
*
* @param notifierHandle A pointer to the notifier handle.
* @param configs A pointer to an array with references to all configurations which is handled by the Notifier.
* @param configsNumber Number of configurations. Size of the configuration array.
* @param callbacks A pointer to an array of callback configurations.
* If there are no callbacks to register during Notifier initialization, use NULL value.
* @param callbacksNumber Number of registered callbacks. Size of the callbacks array.
* @param userFunction User function.
* @param userData User data passed to user function.
* @return An error Code or kStatus_Success.
*/
status_t NOTIFIER_CreateHandle(notifier_handle_t *notifierHandle,
notifier_user_config_t **configs,
uint8_t configsNumber,
notifier_callback_config_t *callbacks,
uint8_t callbacksNumber,
notifier_user_function_t userFunction,
void *userData);
/*!
* @brief Switches the configuration according to a pre-defined structure.
*
* This function sets the system to the target configuration. Before transition,
* the Notifier sends notifications to all callbacks registered to the callback table.
* Callbacks are invoked in the following order: All registered callbacks are notified
* ordered by index in the callbacks array. The same order is used for before and after switch notifications.
* The notifications before the configuration switch can be used to obtain confirmation about
* the change from registered callbacks. If any registered callback denies the
* configuration change, further execution of this function depends on the notifier policy: the
* configuration change is either forced (kNOTIFIER_PolicyForcible) or exited (kNOTIFIER_PolicyAgreement).
* When configuration change is forced, the result of the before switch notifications are ignored. If an
* agreement is required, if any callback returns an error code, further notifications
* before switch notifications are cancelled and all already notified callbacks are re-invoked.
* The index of the callback which returned error code during pre-switch notifications is stored
* (any error codes during callbacks re-invocation are ignored) and NOTIFIER_GetErrorCallback() can be used to get it.
* Regardless of the policies, if any callback returns an error code, an error code indicating in which phase
* the error occurred is returned when NOTIFIER_SwitchConfig() exits.
* @param notifierHandle pointer to notifier handle
* @param configIndex Index of the target configuration.
* @param policy Transaction policy, kNOTIFIER_PolicyAgreement or kNOTIFIER_PolicyForcible.
*
* @return An error code or kStatus_Success.
*
*/
status_t NOTIFIER_SwitchConfig(notifier_handle_t *notifierHandle, uint8_t configIndex, notifier_policy_t policy);
/*!
* @brief This function returns the last failed notification callback.
*
* This function returns an index of the last callback that failed during the configuration switch while
* the last NOTIFIER_SwitchConfig() was called. If the last NOTIFIER_SwitchConfig() call ended successfully
* value equal to callbacks number is returned. The returned value represents an index in the array of
* static call-backs.
*
* @param notifierHandle Pointer to the notifier handle
* @return Callback Index of the last failed callback or value equal to callbacks count.
*/
uint8_t NOTIFIER_GetErrorCallbackIndex(notifier_handle_t *notifierHandle);
#if defined(__cplusplus)
}
#endif /* __cplusplus */
/*! @}*/
#endif /* _FSL_NOTIFIER_H_ */