1 files changed, 138 insertions, 0 deletions

diff --git a/drivers/isdn/mISDN/dsp_hwec.c b/drivers/isdn/mISDN/dsp_hwec.c
new file mode 100644
index 000000000000..eb892d9dd5c6
--- /dev/null
+++ b/drivers/isdn/mISDN/dsp_hwec.c
@@ -0,0 +1,138 @@
+/*
+ * dsp_hwec.c:
+ * builtin mISDN dsp pipeline element for enabling the hw echocanceller
+ *
+ * Copyright (C) 2007, Nadi Sarrar
+ *
+ * Nadi Sarrar <nadi@beronet.com>
+ *
+ * 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.
+ *
+ */
+
+#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 = sizeof(args) / sizeof(struct mISDN_dsp_element_arg),
+        .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[len + 1];
+                char *dup, *tok, *name, *val;
+                int tmp;
+
+                strcpy(_dup, arg);
+                dup = _dup;
+
+                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;
+                        }
+                }
+        }
+
+_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);
+}
+