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/*
* ECHO_CAN_JPAH
*
* by Jason Parker
*
* Based upon mg2ec.h - sort of.
* This "echo can" will completely hose your audio.
* Don't use it unless you're absolutely sure you know what you're doing.
*
* Copyright (C) 2007-2008, Digium, Inc.
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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 <linux/kernel.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/ctype.h>
#include <linux/moduleparam.h>
#include <dahdi/kernel.h>
static int debug;
#define module_printk(level, fmt, args...) printk(level "%s: " fmt, THIS_MODULE->name, ## args)
#define debug_printk(level, fmt, args...) if (debug >= level) printk("%s (%s): " fmt, THIS_MODULE->name, __FUNCTION__, ## args)
struct echo_can_state {
int blah;
};
static int echo_can_create(struct dahdi_echocanparams *ecp, struct dahdi_echocanparam *p,
struct echo_can_state **ec)
{
unsigned int x;
char *c;
if ((*ec = kmalloc(sizeof(**ec), GFP_KERNEL))) {
memset(ec, 0, sizeof(**ec));
}
for (x = 0; x < ecp->param_count; x++) {
for (c = p[x].name; *c; c++)
*c = tolower(*c);
printk(KERN_WARNING "Unknown parameter supplied to JPAH echo canceler: '%s'\n", p[x].name);
kfree(*ec);
return -EINVAL;
}
return 0;
}
static void echo_can_free(struct echo_can_state *ec)
{
kfree(ec);
}
static void echo_can_update(struct echo_can_state *ec, short *iref, short *isig)
{
unsigned int x;
for (x = 0; x < DAHDI_CHUNKSIZE; x++) {
if (ec->blah < 2) {
ec->blah++;
*isig++ = 0;
} else {
ec->blah = 0;
isig++;
}
}
}
static int echo_can_traintap(struct echo_can_state *ec, int pos, short val)
{
return 0;
}
static const struct dahdi_echocan me = {
.name = "JPAH",
.owner = THIS_MODULE,
.echo_can_create = echo_can_create,
.echo_can_free = echo_can_free,
.echo_can_array_update = echo_can_update,
.echo_can_traintap = echo_can_traintap,
};
static int __init mod_init(void)
{
if (dahdi_register_echocan(&me)) {
module_printk(KERN_ERR, "could not register with DAHDI core\n");
return -EPERM;
}
module_printk(KERN_NOTICE, "Registered echo canceler '%s'\n", me.name);
return 0;
}
static void __exit mod_exit(void)
{
dahdi_unregister_echocan(&me);
}
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_DESCRIPTION("DAHDI Jason Parker Audio Hoser");
MODULE_AUTHOR("Jason Parker <jparker@digium.com>");
MODULE_LICENSE("GPL v2");
module_init(mod_init);
module_exit(mod_exit);
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