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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
*
* @File ctimap.c
*
* @Brief
* This file contains the implementation of generic input mapper operations
* for input mapper management.
*
* @Author Liu Chun
* @Date May 23 2008
*/
#include "ctimap.h"
#include <linux/slab.h>
int input_mapper_add(struct list_head *mappers, struct imapper *entry,
int (*map_op)(void *, struct imapper *), void *data)
{
struct list_head *pos, *pre, *head;
struct imapper *pre_ent, *pos_ent;
head = mappers;
if (list_empty(head)) {
entry->next = entry->addr;
map_op(data, entry);
list_add(&entry->list, head);
return 0;
}
list_for_each(pos, head) {
pos_ent = list_entry(pos, struct imapper, list);
if (pos_ent->slot > entry->slot) {
/* found a position in list */
break;
}
}
if (pos != head) {
pre = pos->prev;
if (pre == head)
pre = head->prev;
__list_add(&entry->list, pos->prev, pos);
} else {
pre = head->prev;
pos = head->next;
list_add_tail(&entry->list, head);
}
pre_ent = list_entry(pre, struct imapper, list);
pos_ent = list_entry(pos, struct imapper, list);
entry->next = pos_ent->addr;
map_op(data, entry);
pre_ent->next = entry->addr;
map_op(data, pre_ent);
return 0;
}
int input_mapper_delete(struct list_head *mappers, struct imapper *entry,
int (*map_op)(void *, struct imapper *), void *data)
{
struct list_head *next, *pre, *head;
struct imapper *pre_ent, *next_ent;
head = mappers;
if (list_empty(head))
return 0;
pre = (entry->list.prev == head) ? head->prev : entry->list.prev;
next = (entry->list.next == head) ? head->next : entry->list.next;
if (pre == &entry->list) {
/* entry is the only one node in mappers list */
entry->next = entry->addr = entry->user = entry->slot = 0;
map_op(data, entry);
list_del(&entry->list);
return 0;
}
pre_ent = list_entry(pre, struct imapper, list);
next_ent = list_entry(next, struct imapper, list);
pre_ent->next = next_ent->addr;
map_op(data, pre_ent);
list_del(&entry->list);
return 0;
}
void free_input_mapper_list(struct list_head *head)
{
struct imapper *entry;
struct list_head *pos;
while (!list_empty(head)) {
pos = head->next;
list_del(pos);
entry = list_entry(pos, struct imapper, list);
kfree(entry);
}
}
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