// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* dsp_hwec.c:
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* builtin mISDN dsp pipeline element for enabling the hw echocanceller
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*
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* Copyright (C) 2007, Nadi Sarrar
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*
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* Nadi Sarrar <nadi@beronet.com>
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/mISDNdsp.h>
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#include <linux/mISDNif.h>
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#include "core.h"
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#include "dsp.h"
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#include "dsp_hwec.h"
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static struct mISDN_dsp_element_arg args[] = {
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{ "deftaps", "128", "Set the number of taps of cancellation." },
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};
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static struct mISDN_dsp_element dsp_hwec_p = {
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.name = "hwec",
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.new = NULL,
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.free = NULL,
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.process_tx = NULL,
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.process_rx = NULL,
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.num_args = ARRAY_SIZE(args),
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.args = args,
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};
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struct mISDN_dsp_element *dsp_hwec = &dsp_hwec_p;
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void dsp_hwec_enable(struct dsp *dsp, const char *arg)
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{
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int deftaps = 128,
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len;
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struct mISDN_ctrl_req cq;
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if (!dsp) {
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printk(KERN_ERR "%s: failed to enable hwec: dsp is NULL\n",
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__func__);
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return;
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}
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if (!arg)
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goto _do;
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len = strlen(arg);
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if (!len)
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goto _do;
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{
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char *dup, *tok, *name, *val;
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int tmp;
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dup = kstrdup(arg, GFP_ATOMIC);
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if (!dup)
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return;
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while ((tok = strsep(&dup, ","))) {
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if (!strlen(tok))
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continue;
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name = strsep(&tok, "=");
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val = tok;
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if (!val)
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continue;
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if (!strcmp(name, "deftaps")) {
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if (sscanf(val, "%d", &tmp) == 1)
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deftaps = tmp;
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}
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}
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kfree(dup);
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}
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_do:
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printk(KERN_DEBUG "%s: enabling hwec with deftaps=%d\n",
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__func__, deftaps);
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memset(&cq, 0, sizeof(cq));
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cq.op = MISDN_CTRL_HFC_ECHOCAN_ON;
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cq.p1 = deftaps;
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if (!dsp->ch.peer->ctrl(&dsp->ch, CONTROL_CHANNEL, &cq)) {
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printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
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__func__);
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return;
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}
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}
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void dsp_hwec_disable(struct dsp *dsp)
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{
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struct mISDN_ctrl_req cq;
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if (!dsp) {
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printk(KERN_ERR "%s: failed to disable hwec: dsp is NULL\n",
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__func__);
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return;
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}
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printk(KERN_DEBUG "%s: disabling hwec\n", __func__);
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memset(&cq, 0, sizeof(cq));
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cq.op = MISDN_CTRL_HFC_ECHOCAN_OFF;
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if (!dsp->ch.peer->ctrl(&dsp->ch, CONTROL_CHANNEL, &cq)) {
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printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
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__func__);
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return;
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}
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}
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int dsp_hwec_init(void)
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{
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mISDN_dsp_element_register(dsp_hwec);
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return 0;
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}
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void dsp_hwec_exit(void)
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{
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mISDN_dsp_element_unregister(dsp_hwec);
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}
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