mirror of https://gitee.com/openkylin/linux.git
139 lines
3.0 KiB
C
139 lines
3.0 KiB
C
/*
|
|
* dsp_hwec.c:
|
|
* builtin mISDN dsp pipeline element for enabling the hw echocanceller
|
|
*
|
|
* Copyright (C) 2007, Nadi Sarrar
|
|
*
|
|
* Nadi Sarrar <nadi@beronet.com>
|
|
*
|
|
* 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.
|
|
*
|
|
* The full GNU General Public License is included in this distribution in the
|
|
* file called LICENSE.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mISDNdsp.h>
|
|
#include <linux/mISDNif.h>
|
|
#include "core.h"
|
|
#include "dsp.h"
|
|
#include "dsp_hwec.h"
|
|
|
|
static struct mISDN_dsp_element_arg args[] = {
|
|
{ "deftaps", "128", "Set the number of taps of cancellation." },
|
|
};
|
|
|
|
static struct mISDN_dsp_element dsp_hwec_p = {
|
|
.name = "hwec",
|
|
.new = NULL,
|
|
.free = NULL,
|
|
.process_tx = NULL,
|
|
.process_rx = NULL,
|
|
.num_args = ARRAY_SIZE(args),
|
|
.args = args,
|
|
};
|
|
struct mISDN_dsp_element *dsp_hwec = &dsp_hwec_p;
|
|
|
|
void dsp_hwec_enable(struct dsp *dsp, const char *arg)
|
|
{
|
|
int deftaps = 128,
|
|
len;
|
|
struct mISDN_ctrl_req cq;
|
|
|
|
if (!dsp) {
|
|
printk(KERN_ERR "%s: failed to enable hwec: dsp is NULL\n",
|
|
__func__);
|
|
return;
|
|
}
|
|
|
|
if (!arg)
|
|
goto _do;
|
|
|
|
len = strlen(arg);
|
|
if (!len)
|
|
goto _do;
|
|
|
|
{
|
|
char _dup[len + 1];
|
|
char *dup, *tok, *name, *val;
|
|
int tmp;
|
|
|
|
strcpy(_dup, arg);
|
|
dup = _dup;
|
|
|
|
while ((tok = strsep(&dup, ","))) {
|
|
if (!strlen(tok))
|
|
continue;
|
|
name = strsep(&tok, "=");
|
|
val = tok;
|
|
|
|
if (!val)
|
|
continue;
|
|
|
|
if (!strcmp(name, "deftaps")) {
|
|
if (sscanf(val, "%d", &tmp) == 1)
|
|
deftaps = tmp;
|
|
}
|
|
}
|
|
}
|
|
|
|
_do:
|
|
printk(KERN_DEBUG "%s: enabling hwec with deftaps=%d\n",
|
|
__func__, deftaps);
|
|
memset(&cq, 0, sizeof(cq));
|
|
cq.op = MISDN_CTRL_HFC_ECHOCAN_ON;
|
|
cq.p1 = deftaps;
|
|
if (!dsp->ch.peer->ctrl(&dsp->ch, CONTROL_CHANNEL, &cq)) {
|
|
printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
|
|
__func__);
|
|
return;
|
|
}
|
|
}
|
|
|
|
void dsp_hwec_disable(struct dsp *dsp)
|
|
{
|
|
struct mISDN_ctrl_req cq;
|
|
|
|
if (!dsp) {
|
|
printk(KERN_ERR "%s: failed to disable hwec: dsp is NULL\n",
|
|
__func__);
|
|
return;
|
|
}
|
|
|
|
printk(KERN_DEBUG "%s: disabling hwec\n", __func__);
|
|
memset(&cq, 0, sizeof(cq));
|
|
cq.op = MISDN_CTRL_HFC_ECHOCAN_OFF;
|
|
if (!dsp->ch.peer->ctrl(&dsp->ch, CONTROL_CHANNEL, &cq)) {
|
|
printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
|
|
__func__);
|
|
return;
|
|
}
|
|
}
|
|
|
|
int dsp_hwec_init(void)
|
|
{
|
|
mISDN_dsp_element_register(dsp_hwec);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void dsp_hwec_exit(void)
|
|
{
|
|
mISDN_dsp_element_unregister(dsp_hwec);
|
|
}
|
|
|