start copying kernel bits

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@4315 a0bf4364-ded3-4de4-8d8a-66a801d63aff

1 files changed, 68 insertions, 0 deletions

diff --git a/drivers/dahdi/adt_lec.c b/drivers/dahdi/adt_lec.c
new file mode 100644
index 0000000..d191e2b
--- /dev/null
+++ b/drivers/dahdi/adt_lec.c
@@ -0,0 +1,68 @@
+/*
+ * ADT Line Echo Canceller Parameter Parsing
+ *
+ * Copyright (C) 2008 Digium, Inc.
+ *
+ * Kevin P. Fleming <kpfleming@digium.com>
+ *
+ * All rights reserved.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA. 
+ */
+
+#ifndef _ADT_LEC_C
+#define _ADT_LEC_C
+
+#include <linux/ctype.h>
+
+static inline void adt_lec_init_defaults(struct adt_lec_params *params, __u32 tap_length)
+{
+	memset(params, 0, sizeof(*params));
+	params->tap_length = tap_length;
+}
+
+static int adt_lec_parse_params(struct adt_lec_params *params, struct zt_echocanparams *ecp, struct zt_echocanparam *p)
+{
+	unsigned int x;
+	char *c;
+
+	for (x = 0; x < ecp->param_count; x++) {
+		for (c = p[x].name; *c; c++)
+			*c = tolower(*c);
+		if (!strcmp(p[x].name, "nlp_type")) {
+			switch (p[x].value) {
+			case ADT_LEC_NLP_OFF:
+			case ADT_LEC_NLP_MUTE:
+			case ADT_LEC_RANDOM_NOISE:
+			case ADT_LEC_HOTH_NOISE:
+			case ADT_LEC_SUPPRESS:
+				params->nlp_type = p[x].value;
+				break;
+			default:
+				return -EINVAL;
+			}
+		} else if (!strcmp(p[x].name, "nlp_thresh")) {
+			params->nlp_threshold = p[x].value;
+		} else if (!strcmp(p[x].name, "nlp_suppress")) {
+			params->nlp_max_suppress = p[x].value;
+		} else {
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+#endif /* _ADT_LEC_C */