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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 | // 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); } |