DriverUtils

Overview

Defines common macros and interfaces of the driver module.

This module provides interfaces such as log printing, doubly linked list operations, and work queues.

Since:

1.0

Version:

1.0

Summary

Files

File Name	Description
hdf_base.h	Declares driver common types, including the enumerated values returned by the function and the macro for obtaining the array size.
hdf_dlist.h	Declares doubly linked list structures and interfaces.
hdf_log.h	Declares log printing functions of the driver module. This module provides functions for printing logs at the verbose, debug, information, warning, and error levels.
hdf_workqueue.h	Declares work queue structures and interfaces.

Data Structures

Data Structure Name	Description
DListHead	Describes a doubly linked list.
HdfWork	Describes a work item and a delayed work item. This structure defines the work and delayed work items, and then calls the initialization function HdfWorkInit or HdfDelayedWorkInit to perform initialization. The HdfAddWork() function is to add a work item to a work queue immediately, and the HdfAddDelayedWork() function is to add a work item to a work queue after the configured delayed time.
HdfWorkQueue	Describes a work queue.

Macros

Macro Name and Value	Description
HDF_WAIT_FOREVER 0xFFFFFFFF	Indicates that the function keeps waiting to obtain a semaphore or mutex.
HDF_ARRAY_SIZE (a) (sizeof(a) / sizeof((a)[0]))	Defines the array size.
HDF_KILO_UNIT 1000	Defines a time conversion unit, for example, the unit for converting from second to millisecond.
CONTAINER_OF(ptr, type, member) (type )((char )(ptr) - (char )&((type )0)->member)	Obtains the address of a structure variable from its member address.
DLIST_FIRST_ENTRY(ptr, type, member) CONTAINER_OF((ptr)->next, type, member)	Obtains the first node of a doubly linked list.
DLIST_LAST_ENTRY(ptr, type, member) CONTAINER_OF((ptr)->prev, type, member)	Obtains the last node of a doubly linked list.
DLIST_FOR_EACH_ENTRY(pos, head, type, member)	Traverses all nodes in a doubly linked list.
DLIST_FOR_EACH_ENTRY_SAFE(pos, tmp, head, type, member)	Traverses all nodes in a doubly linked list. This function is used to delete the nodes pointed to by pos during traversal.
LOG_TAG_MARK_EXTEND(HDF_TAG) #HDF_TAG
HDF_LOGV(fmt, arg…) printf(“[HDF:V/“ LOG_TAG “]” fmt “\r\n”, ##arg)	Prints logs at the verbose level.
HDF_LOGD(fmt, arg…) printf(“[HDF:D/“ LOG_TAG “]” fmt “\r\n”, ##arg)	Prints logs at the debug level.
HDF_LOGI(fmt, arg…) printf(“[HDF:I/“ LOG_TAG “]” fmt “\r\n”, ##arg)	Prints logs at the information level.
HDF_LOGW(fmt, arg…) printf(“[HDF:W/“ LOG_TAG “]” fmt “\r\n”, ##arg)	Prints logs at the warning level.
HDF_LOGE(fmt, arg…) printf(“[HDF:E/“ LOG_TAG “]” fmt “\r\n”, ##arg)	Prints logs at the error level.

Typedefs

Typedef Name	Description
HdfWorkFunc) (void )	typedef void( Describes a work execution function type.

Enumerations

Enumeration Name	Description
HDF_STATUS { HDF_SUCCESS = 0, HDF_FAILURE = -1, HDF_ERR_NOT_SUPPORT = -2, HDF_ERR_INVALID_PARAM = -3, HDF_ERR_INVALID_OBJECT = -4, HDF_ERR_MALLOC_FAIL = -6, HDF_ERR_TIMEOUT = -7, HDF_ERR_THREAD_CREATE_FAIL = -10, HDF_ERR_QUEUE_FULL = -15, HDF_ERR_DEVICE_BUSY = -16, HDF_ERR_IO = -17, HDF_ERR_BAD_FD = -18, HDF_BSP_ERR_OP = HDF_BSP_ERR_NUM(-1), HDF_ERR_BSP_PLT_API_ERR = HDF_BSP_ERR_NUM(-2), HDF_PAL_ERR_DEV_CREATE = HDF_BSP_ERR_NUM(-3), HDF_PAL_ERR_INNER = HDF_BSP_ERR_NUM(-4), HDF_DEV_ERR_NO_MEMORY = HDF_DEV_ERR_NUM(-1), HDF_DEV_ERR_NO_DEVICE = HDF_DEV_ERR_NUM(-2), HDF_DEV_ERR_NO_DEVICE_SERVICE = HDF_DEV_ERR_NUM(-3), HDF_DEV_ERR_DEV_INIT_FAIL = HDF_DEV_ERR_NUM(-4), HDF_DEV_ERR_PUBLISH_FAIL = HDF_DEV_ERR_NUM(-5), HDF_DEV_ERR_ATTACHDEV_FAIL = HDF_DEV_ERR_NUM(-6), HDF_DEV_ERR_NODATA = HDF_DEV_ERR_NUM(-7), HDF_DEV_ERR_NORANGE = HDF_DEV_ERR_NUM(-8), HDF_DEV_ERR_OP = HDF_DEV_ERR_NUM(-10) }	Enumerates HDF return value types.
{ HDF_WORK_BUSY_PENDING = 1 << 0, HDF_WORK_BUSY_RUNNING = 1 << 1 }	Enumerates statuses of a work item or a delayed work item.

Enumeration Name

Description

HDF_STATUS { HDF_SUCCESS = 0, HDF_FAILURE = -1, HDF_ERR_NOT_SUPPORT = -2, HDF_ERR_INVALID_PARAM = -3, HDF_ERR_INVALID_OBJECT = -4, HDF_ERR_MALLOC_FAIL = -6, HDF_ERR_TIMEOUT = -7, HDF_ERR_THREAD_CREATE_FAIL = -10, HDF_ERR_QUEUE_FULL = -15, HDF_ERR_DEVICE_BUSY = -16, HDF_ERR_IO = -17, HDF_ERR_BAD_FD = -18, HDF_BSP_ERR_OP = HDF_BSP_ERR_NUM(-1), HDF_ERR_BSP_PLT_API_ERR = HDF_BSP_ERR_NUM(-2), HDF_PAL_ERR_DEV_CREATE = HDF_BSP_ERR_NUM(-3), HDF_PAL_ERR_INNER = HDF_BSP_ERR_NUM(-4), HDF_DEV_ERR_NO_MEMORY = HDF_DEV_ERR_NUM(-1), HDF_DEV_ERR_NO_DEVICE = HDF_DEV_ERR_NUM(-2), HDF_DEV_ERR_NO_DEVICE_SERVICE = HDF_DEV_ERR_NUM(-3), HDF_DEV_ERR_DEV_INIT_FAIL = HDF_DEV_ERR_NUM(-4), HDF_DEV_ERR_PUBLISH_FAIL = HDF_DEV_ERR_NUM(-5), HDF_DEV_ERR_ATTACHDEV_FAIL = HDF_DEV_ERR_NUM(-6), HDF_DEV_ERR_NODATA = HDF_DEV_ERR_NUM(-7), HDF_DEV_ERR_NORANGE = HDF_DEV_ERR_NUM(-8), HDF_DEV_ERR_OP = HDF_DEV_ERR_NUM(-10) }

Enumerates HDF return value types.

{ HDF_WORK_BUSY_PENDING = 1 << 0, HDF_WORK_BUSY_RUNNING = 1 << 1 }

Enumerates statuses of a work item or a delayed work item.

Functions

Function Name	Description
DListHeadInit (struct DListHead head)	static void Initializes a doubly linked list.
DListIsEmpty (const struct DListHead head)	static bool Checks whether a doubly linked list is empty.
DListRemove (struct DListHead entry)	static void Removes a node from a doubly linked list.
DListInsertHead (struct DListHead entry, struct DListHead head)	static void Inserts a node from the head of a doubly linked list.
DListInsertTail (struct DListHead entry, struct DListHead head)	static void Inserts a node from the tail of a doubly linked list.
DListMerge (struct DListHead list, struct DListHead head)	static void Merges two linked lists by adding the list specified by list to the head of the list specified by head and initializes the merged list.
HdfWorkQueueInit (HdfWorkQueue queue, char name)	int32_t Initializes a work queue.
HdfWorkInit (HdfWork work, HdfWorkFunc func, void arg)	int32_t Initializes a work item.
HdfDelayedWorkInit (HdfWork work, HdfWorkFunc func, void arg)	int32_t Initializes a delayed work item.
HdfWorkDestroy (HdfWork work)	void Destroys a work item.
HdfWorkQueueDestroy (HdfWorkQueue queue)	void Destroys a work queue.
HdfDelayedWorkDestroy (HdfWork work)	void Destroys a delayed work item.
HdfAddWork (HdfWorkQueue queue, HdfWork work)	bool Adds a work item to a work queue.
HdfAddDelayedWork (HdfWorkQueue queue, HdfWork work, unsigned long ms)	bool Adds a delayed work item to a work queue.
HdfWorkBusy (HdfWork work)	unsigned int Obtains the status of a work item or delayed work item.
HdfCancelWorkSync (HdfWork work)	bool Cancels a work item. This function waits until the work item is complete.
HdfCancelDelayedWorkSync (HdfWork *work)	bool Cancels a delayed work item.

Details

Macro Definition Documentation

CONTAINER_OF


1. #define CONTAINER_OF( ptr,  type,  member )   (type *)((char *)(ptr) - (char *)&((type *)0)->member)

Description:

Obtains the address of a structure variable from its member address.

Parameters:

Name	Description
ptr	Indicates the structure member address.
type	Indicates the structure type.
member	Indicates the structure member.

DLIST_FIRST_ENTRY


1. #define DLIST_FIRST_ENTRY( ptr,  type,  member )   [CONTAINER_OF]($api-api-SmartVision-Devices-DriverUtils.md#ga818b9cca761fe7bc18e4e417da772976)((ptr)->next, type, member)

Description:

Obtains the first node of a doubly linked list.

Parameters:

Name	Description
ptr	Indicates the structure member address.
type	Indicates the structure type.
member	Indicates the structure member.

DLIST_FOR_EACH_ENTRY


1. #define DLIST_FOR_EACH_ENTRY( pos,  head,  type,  member )


1. Values: for ((pos) = [CONTAINER_OF]($api-api-SmartVision-Devices-DriverUtils.md#ga818b9cca761fe7bc18e4e417da772976)((head)->next, type, member); \

3. &(pos)->member != (head); \

5. (pos) = [CONTAINER_OF]($api-api-SmartVision-Devices-DriverUtils.md#ga818b9cca761fe7bc18e4e417da772976)((pos)->member.next, type, member))

Description:

Traverses all nodes in a doubly linked list.

Parameters:

Name	Description
pos	Indicates the pointer to the structure variable.
head	Indicates the pointer to the linked list head.
type	Indicates the structure type.
member	Indicates the member type of the structure.

DLIST_FOR_EACH_ENTRY_SAFE


1. #define DLIST_FOR_EACH_ENTRY_SAFE( pos,  tmp,  head,  type,  member )


1. Values: for ((pos) = [CONTAINER_OF]($api-api-SmartVision-Devices-DriverUtils.md#ga818b9cca761fe7bc18e4e417da772976)((head)->next, type, member), \

3. (tmp) = [CONTAINER_OF]($api-api-SmartVision-Devices-DriverUtils.md#ga818b9cca761fe7bc18e4e417da772976)((pos)->member.next, type, member); \

5. &(pos)->member != (head); \

7. (pos) = (tmp), (tmp) = [CONTAINER_OF]($api-api-SmartVision-Devices-DriverUtils.md#ga818b9cca761fe7bc18e4e417da772976)((pos)->member.next, type, member))

Description:

Traverses all nodes in a doubly linked list. This function is used to delete the nodes pointed to by pos during traversal.

Parameters:

Name	Description
pos	Indicates the pointer to the structure variable.
tmp	Indicates the pointer to the structure variable, pointing to the next node of pos.
head	Indicates the pointer to the linked list head.
type	Indicates the structure type.
member	Indicates the member type of the structure.

DLIST_LAST_ENTRY


1. #define DLIST_LAST_ENTRY( ptr,  type,  member )   [CONTAINER_OF]($api-api-SmartVision-Devices-DriverUtils.md#ga818b9cca761fe7bc18e4e417da772976)((ptr)->prev, type, member)

Description:

Obtains the last node of a doubly linked list.

Parameters:

Name	Description
ptr	Indicates the structure member address.
type	Indicates the structure type.
member	Indicates the structure member.