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/**
* @file me_slist.c
*
* @brief Implements the subdevice list class.
* @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
* @author Guenter Gebhardt
*/
/*
* Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "meerror.h"
#include "medefines.h"
#include "meslist.h"
#include "medebug.h"
int me_slist_query_number_subdevices(struct me_slist *slist, int *number)
{
PDEBUG_LOCKS("called.\n");
*number = slist->n;
return ME_ERRNO_SUCCESS;
}
unsigned int me_slist_get_number_subdevices(struct me_slist *slist)
{
PDEBUG_LOCKS("called.\n");
return slist->n;
}
me_subdevice_t *me_slist_get_subdevice(struct me_slist * slist,
unsigned int index)
{
struct list_head *pos;
me_subdevice_t *subdevice = NULL;
unsigned int i = 0;
PDEBUG_LOCKS("called.\n");
if (index >= slist->n) {
PERROR("Index out of range.\n");
return NULL;
}
list_for_each(pos, &slist->head) {
if (i == index) {
subdevice = list_entry(pos, me_subdevice_t, list);
break;
}
++i;
}
return subdevice;
}
int me_slist_get_subdevice_by_type(struct me_slist *slist,
unsigned int start_subdevice,
int type, int subtype, int *subdevice)
{
me_subdevice_t *pos;
int s_type, s_subtype;
unsigned int index = 0;
PDEBUG_LOCKS("called.\n");
if (start_subdevice >= slist->n) {
PERROR("Start index out of range.\n");
return ME_ERRNO_NOMORE_SUBDEVICE_TYPE;
}
list_for_each_entry(pos, &slist->head, list) {
if (index < start_subdevice) { // Go forward to start subdevice.
++index;
continue;
}
pos->me_subdevice_query_subdevice_type(pos,
&s_type, &s_subtype);
if (subtype == ME_SUBTYPE_ANY) {
if (s_type == type)
break;
} else {
if ((s_type == type) && (s_subtype == subtype))
break;
}
++index;
}
if (index >= slist->n) {
return ME_ERRNO_NOMORE_SUBDEVICE_TYPE;
}
*subdevice = index;
return ME_ERRNO_SUCCESS;
}
void me_slist_add_subdevice_tail(struct me_slist *slist,
me_subdevice_t * subdevice)
{
PDEBUG_LOCKS("called.\n");
list_add_tail(&subdevice->list, &slist->head);
++slist->n;
}
me_subdevice_t *me_slist_del_subdevice_tail(struct me_slist *slist)
{
struct list_head *last;
me_subdevice_t *subdevice;
PDEBUG_LOCKS("called.\n");
if (list_empty(&slist->head))
return NULL;
last = slist->head.prev;
subdevice = list_entry(last, me_subdevice_t, list);
list_del(last);
--slist->n;
return subdevice;
}
int me_slist_init(me_slist_t * slist)
{
PDEBUG_LOCKS("called.\n");
INIT_LIST_HEAD(&slist->head);
slist->n = 0;
return 0;
}
void me_slist_deinit(me_slist_t * slist)
{
struct list_head *s;
me_subdevice_t *subdevice;
PDEBUG_LOCKS("called.\n");
while (!list_empty(&slist->head)) {
s = slist->head.next;
list_del(s);
subdevice = list_entry(s, me_subdevice_t, list);
subdevice->me_subdevice_destructor(subdevice);
}
slist->n = 0;
}
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