113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
/**
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* Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
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*
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* This source file is released under GPL v2 license (no other versions).
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* See the COPYING file included in the main directory of this source
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* distribution for the license terms and conditions.
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*
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* @File ctimap.c
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*
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* @Brief
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* This file contains the implementation of generic input mapper operations
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* for input mapper management.
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*
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* @Author Liu Chun
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* @Date May 23 2008
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*
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*/
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#include "ctimap.h"
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#include <linux/slab.h>
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int input_mapper_add(struct list_head *mappers, struct imapper *entry,
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int (*map_op)(void *, struct imapper *), void *data)
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{
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struct list_head *pos, *pre, *head;
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struct imapper *pre_ent, *pos_ent;
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head = mappers;
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if (list_empty(head)) {
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entry->next = entry->addr;
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map_op(data, entry);
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list_add(&entry->list, head);
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return 0;
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}
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list_for_each(pos, head) {
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pos_ent = list_entry(pos, struct imapper, list);
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if (pos_ent->slot > entry->slot) {
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/* found a position in list */
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break;
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}
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}
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if (pos != head) {
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pre = pos->prev;
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if (pre == head)
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pre = head->prev;
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__list_add(&entry->list, pos->prev, pos);
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} else {
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pre = head->prev;
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pos = head->next;
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list_add_tail(&entry->list, head);
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}
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pre_ent = list_entry(pre, struct imapper, list);
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pos_ent = list_entry(pos, struct imapper, list);
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entry->next = pos_ent->addr;
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map_op(data, entry);
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pre_ent->next = entry->addr;
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map_op(data, pre_ent);
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return 0;
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}
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int input_mapper_delete(struct list_head *mappers, struct imapper *entry,
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int (*map_op)(void *, struct imapper *), void *data)
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{
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struct list_head *next, *pre, *head;
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struct imapper *pre_ent, *next_ent;
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head = mappers;
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if (list_empty(head))
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return 0;
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pre = (entry->list.prev == head) ? head->prev : entry->list.prev;
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next = (entry->list.next == head) ? head->next : entry->list.next;
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if (pre == &entry->list) {
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/* entry is the only one node in mappers list */
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entry->next = entry->addr = entry->user = entry->slot = 0;
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map_op(data, entry);
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list_del(&entry->list);
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return 0;
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}
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pre_ent = list_entry(pre, struct imapper, list);
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next_ent = list_entry(next, struct imapper, list);
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pre_ent->next = next_ent->addr;
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map_op(data, pre_ent);
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list_del(&entry->list);
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return 0;
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}
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void free_input_mapper_list(struct list_head *head)
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{
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struct imapper *entry;
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struct list_head *pos;
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while (!list_empty(head)) {
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pos = head->next;
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list_del(pos);
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entry = list_entry(pos, struct imapper, list);
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kfree(entry);
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}
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}
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