/*
 * This program 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Copyright (c) 2008 Andy Green <andy@openmoko.com>
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include "ts_filter.h"

static DEFINE_MUTEX(chain_mutex);

int ts_filter_create_chain(struct platform_device *pdev,
			   struct ts_filter_api **api, void **config,
			   struct ts_filter **arr, int count_coords)
{
	int count = 0;
	struct ts_filter *last = NULL;

	if (!api)
		return 0;

	mutex_lock(&chain_mutex);

	while (*api) {
		*arr = ((*api)->create)(pdev, *config++, count_coords);
		if (!*arr) {
			printk(KERN_ERR "Filter %d failed init\n", count);
			return count;
		}
		(*arr)->api = *api++;
		if (last)
			last->next = *arr;
		last = *arr;
		arr++;
		count++;
	}

	mutex_unlock(&chain_mutex);

	return count;
}
EXPORT_SYMBOL_GPL(ts_filter_create_chain);

void ts_filter_destroy_chain(struct platform_device *pdev,
			     struct ts_filter **arr)
{
	struct ts_filter **first = arr;

	mutex_lock(&chain_mutex);

	while (*arr) {
		((*arr)->api->destroy)(pdev, *arr);
		arr++;
	}
	*first = NULL;

	mutex_unlock(&chain_mutex);
}
EXPORT_SYMBOL_GPL(ts_filter_destroy_chain);