drivers/staging/meilhaus/medlist.h

   1 /**
   2  * @file me_dlist.h
   3  *
   4  * @brief Provides the device list class.
   5  * @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
   6  * @author Guenter Gebhardt
   7  */
   8
   9 #ifndef _ME_DLIST_H_
  10 #define _ME_DLIST_H_
  11
  12 #include <linux/list.h>
  13
  14 #include "medevice.h"
  15
  16 #ifdef __KERNEL__
  17
  18 /**
  19  * @brief The device list container.
  20  */
  21 typedef struct me_dlist {
  22         struct list_head head;          /**< The head of the internal list. */
  23         unsigned int n;                 /**< The number of devices in the list. */
  24 } me_dlist_t;
  25
  26 /**
  27  * @brief Queries the number of devices currently inside the list.
  28  *
  29  * @param dlist The device list to query.
  30  * @param[out] number The number of devices.
  31  *
  32  * @return ME-iDS error code.
  33  */
  34 int me_dlist_query_number_devices(struct me_dlist *dlist, int *number);
  35
  36 /**
  37  * @brief Returns the number of devices currently inside the list.
  38  *
  39  * @param dlist The device list to query.
  40  *
  41  * @return The number of devices in the list.
  42  */
  43 unsigned int me_dlist_get_number_devices(struct me_dlist *dlist);
  44
  45 /**
  46  * @brief Get a device by index.
  47  *
  48  * @param dlist The device list to query.
  49  * @param index The index of the device to get in the list.
  50  *
  51  * @return The device at index if available.\n
  52  *         NULL if the index is out of range.
  53  */
  54 me_device_t *me_dlist_get_device(struct me_dlist *dlist, unsigned int index);
  55
  56 /**
  57  * @brief Adds a device to the tail of the list.
  58  *
  59  * @param dlist The device list to add a device to.
  60  * @param device The device to add to the list.
  61  */
  62 void me_dlist_add_device_tail(struct me_dlist *dlist, me_device_t * device);
  63
  64 /**
  65  * @brief Removes a device from the tail of the list.
  66  *
  67  * @param dlist The device list.
  68  *
  69  * @return Pointer to the removed subdeivce.\n
  70  *         NULL in cases where the list was empty.
  71  */
  72 me_device_t *me_dlist_del_device_tail(struct me_dlist *dlist);
  73
  74 /**
  75  * @brief Initializes a device list structure.
  76  *
  77  * @param lock The device list structure to initialize.
  78  * @return 0 on success.
  79  */
  80 int me_dlist_init(me_dlist_t * dlist);
  81
  82 /**
  83  * @brief Deinitializes a device list structure and destructs every device in it.
  84  *
  85  * @param dlist The device list structure to deinitialize.
  86  * @return 0 on success.
  87  */
  88 void me_dlist_deinit(me_dlist_t * dlist);
  89
  90 #endif
  91 #endif