linux/drivers/isdn/mISDN/dsp_hwec.c
Thomas Gleixner 9e567af4f0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 90
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 4 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520075211.959886972@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-24 17:37:53 +02:00

123 lines
2.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* dsp_hwec.c:
* builtin mISDN dsp pipeline element for enabling the hw echocanceller
*
* Copyright (C) 2007, Nadi Sarrar
*
* Nadi Sarrar <nadi@beronet.com>
*/
#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, *tok, *name, *val;
int tmp;
dup = kstrdup(arg, GFP_ATOMIC);
if (!dup)
return;
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;
}
}
kfree(dup);
}
_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);
}