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path: root/drivers/isdn/mISDN/dsp_hwec.c
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Diffstat (limited to 'drivers/isdn/mISDN/dsp_hwec.c')
-rw-r--r--drivers/isdn/mISDN/dsp_hwec.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/drivers/isdn/mISDN/dsp_hwec.c b/drivers/isdn/mISDN/dsp_hwec.c
new file mode 100644
index 0000000000..0b3f291953
--- /dev/null
+++ b/drivers/isdn/mISDN/dsp_hwec.c
@@ -0,0 +1,122 @@
+// 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);
+}