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/**
* @file me_dlist.h
*
* @brief Provides the device list class.
* @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
* @author Guenter Gebhardt
*/
#ifndef _ME_DLIST_H_
#define _ME_DLIST_H_
#include <linux/list.h>
#include "medevice.h"
#ifdef __KERNEL__
/**
* @brief The device list container.
*/
typedef struct me_dlist {
struct list_head head; /**< The head of the internal list. */
unsigned int n; /**< The number of devices in the list. */
} me_dlist_t;
/**
* @brief Queries the number of devices currently inside the list.
*
* @param dlist The device list to query.
* @param[out] number The number of devices.
*
* @return ME-iDS error code.
*/
int me_dlist_query_number_devices(struct me_dlist *dlist, int *number);
/**
* @brief Returns the number of devices currently inside the list.
*
* @param dlist The device list to query.
*
* @return The number of devices in the list.
*/
unsigned int me_dlist_get_number_devices(struct me_dlist *dlist);
/**
* @brief Get a device by index.
*
* @param dlist The device list to query.
* @param index The index of the device to get in the list.
*
* @return The device at index if available.\n
* NULL if the index is out of range.
*/
me_device_t *me_dlist_get_device(struct me_dlist *dlist, unsigned int index);
/**
* @brief Adds a device to the tail of the list.
*
* @param dlist The device list to add a device to.
* @param device The device to add to the list.
*/
void me_dlist_add_device_tail(struct me_dlist *dlist, me_device_t * device);
/**
* @brief Removes a device from the tail of the list.
*
* @param dlist The device list.
*
* @return Pointer to the removed subdeivce.\n
* NULL in cases where the list was empty.
*/
me_device_t *me_dlist_del_device_tail(struct me_dlist *dlist);
/**
* @brief Initializes a device list structure.
*
* @param lock The device list structure to initialize.
* @return 0 on success.
*/
int me_dlist_init(me_dlist_t * dlist);
/**
* @brief Deinitializes a device list structure and destructs every device in it.
*
* @param dlist The device list structure to deinitialize.
* @return 0 on success.
*/
void me_dlist_deinit(me_dlist_t * dlist);
#endif
#endif
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