1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * dsp_hwec.c:
4*4882a593Smuzhiyun * builtin mISDN dsp pipeline element for enabling the hw echocanceller
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Copyright (C) 2007, Nadi Sarrar
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * Nadi Sarrar <nadi@beronet.com>
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/kernel.h>
12*4882a593Smuzhiyun #include <linux/string.h>
13*4882a593Smuzhiyun #include <linux/mISDNdsp.h>
14*4882a593Smuzhiyun #include <linux/mISDNif.h>
15*4882a593Smuzhiyun #include "core.h"
16*4882a593Smuzhiyun #include "dsp.h"
17*4882a593Smuzhiyun #include "dsp_hwec.h"
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun static struct mISDN_dsp_element_arg args[] = {
20*4882a593Smuzhiyun { "deftaps", "128", "Set the number of taps of cancellation." },
21*4882a593Smuzhiyun };
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun static struct mISDN_dsp_element dsp_hwec_p = {
24*4882a593Smuzhiyun .name = "hwec",
25*4882a593Smuzhiyun .new = NULL,
26*4882a593Smuzhiyun .free = NULL,
27*4882a593Smuzhiyun .process_tx = NULL,
28*4882a593Smuzhiyun .process_rx = NULL,
29*4882a593Smuzhiyun .num_args = ARRAY_SIZE(args),
30*4882a593Smuzhiyun .args = args,
31*4882a593Smuzhiyun };
32*4882a593Smuzhiyun struct mISDN_dsp_element *dsp_hwec = &dsp_hwec_p;
33*4882a593Smuzhiyun
dsp_hwec_enable(struct dsp * dsp,const char * arg)34*4882a593Smuzhiyun void dsp_hwec_enable(struct dsp *dsp, const char *arg)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun int deftaps = 128,
37*4882a593Smuzhiyun len;
38*4882a593Smuzhiyun struct mISDN_ctrl_req cq;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun if (!dsp) {
41*4882a593Smuzhiyun printk(KERN_ERR "%s: failed to enable hwec: dsp is NULL\n",
42*4882a593Smuzhiyun __func__);
43*4882a593Smuzhiyun return;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun if (!arg)
47*4882a593Smuzhiyun goto _do;
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun len = strlen(arg);
50*4882a593Smuzhiyun if (!len)
51*4882a593Smuzhiyun goto _do;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun char *dup, *tok, *name, *val;
55*4882a593Smuzhiyun int tmp;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun dup = kstrdup(arg, GFP_ATOMIC);
58*4882a593Smuzhiyun if (!dup)
59*4882a593Smuzhiyun return;
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun while ((tok = strsep(&dup, ","))) {
62*4882a593Smuzhiyun if (!strlen(tok))
63*4882a593Smuzhiyun continue;
64*4882a593Smuzhiyun name = strsep(&tok, "=");
65*4882a593Smuzhiyun val = tok;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun if (!val)
68*4882a593Smuzhiyun continue;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun if (!strcmp(name, "deftaps")) {
71*4882a593Smuzhiyun if (sscanf(val, "%d", &tmp) == 1)
72*4882a593Smuzhiyun deftaps = tmp;
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun kfree(dup);
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun _do:
80*4882a593Smuzhiyun printk(KERN_DEBUG "%s: enabling hwec with deftaps=%d\n",
81*4882a593Smuzhiyun __func__, deftaps);
82*4882a593Smuzhiyun memset(&cq, 0, sizeof(cq));
83*4882a593Smuzhiyun cq.op = MISDN_CTRL_HFC_ECHOCAN_ON;
84*4882a593Smuzhiyun cq.p1 = deftaps;
85*4882a593Smuzhiyun if (!dsp->ch.peer->ctrl(&dsp->ch, CONTROL_CHANNEL, &cq)) {
86*4882a593Smuzhiyun printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
87*4882a593Smuzhiyun __func__);
88*4882a593Smuzhiyun return;
89*4882a593Smuzhiyun }
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
dsp_hwec_disable(struct dsp * dsp)92*4882a593Smuzhiyun void dsp_hwec_disable(struct dsp *dsp)
93*4882a593Smuzhiyun {
94*4882a593Smuzhiyun struct mISDN_ctrl_req cq;
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun if (!dsp) {
97*4882a593Smuzhiyun printk(KERN_ERR "%s: failed to disable hwec: dsp is NULL\n",
98*4882a593Smuzhiyun __func__);
99*4882a593Smuzhiyun return;
100*4882a593Smuzhiyun }
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun printk(KERN_DEBUG "%s: disabling hwec\n", __func__);
103*4882a593Smuzhiyun memset(&cq, 0, sizeof(cq));
104*4882a593Smuzhiyun cq.op = MISDN_CTRL_HFC_ECHOCAN_OFF;
105*4882a593Smuzhiyun if (!dsp->ch.peer->ctrl(&dsp->ch, CONTROL_CHANNEL, &cq)) {
106*4882a593Smuzhiyun printk(KERN_DEBUG "%s: CONTROL_CHANNEL failed\n",
107*4882a593Smuzhiyun __func__);
108*4882a593Smuzhiyun return;
109*4882a593Smuzhiyun }
110*4882a593Smuzhiyun }
111*4882a593Smuzhiyun
dsp_hwec_init(void)112*4882a593Smuzhiyun int dsp_hwec_init(void)
113*4882a593Smuzhiyun {
114*4882a593Smuzhiyun mISDN_dsp_element_register(dsp_hwec);
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun return 0;
117*4882a593Smuzhiyun }
118*4882a593Smuzhiyun
dsp_hwec_exit(void)119*4882a593Smuzhiyun void dsp_hwec_exit(void)
120*4882a593Smuzhiyun {
121*4882a593Smuzhiyun mISDN_dsp_element_unregister(dsp_hwec);
122*4882a593Smuzhiyun }
123