From 3e319499913bc1d12d93b5ff4b9d909db5a793ff Mon Sep 17 00:00:00 2001
From: Tzafrir Cohen <tzafrir.cohen@xorcom.com>
Date: Tue, 21 Oct 2008 17:34:12 +0000
Subject: An experimental OSLEC echocan module.

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@5111 a0bf4364-ded3-4de4-8d8a-66a801d63aff
---
 drivers/dahdi/dahdi_echocan_oslec.c | 103 ++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 drivers/dahdi/dahdi_echocan_oslec.c

(limited to 'drivers/dahdi/dahdi_echocan_oslec.c')

diff --git a/drivers/dahdi/dahdi_echocan_oslec.c b/drivers/dahdi/dahdi_echocan_oslec.c
new file mode 100644
index 0000000..b0c7779
--- /dev/null
+++ b/drivers/dahdi/dahdi_echocan_oslec.c
@@ -0,0 +1,103 @@
+/*
+ * DAHDI Telephony Interface to the Open Source Line Echo Canceller (OSLEC)
+ *
+ * Written by Tzafrir Cohen <tzafrir.cohen@xorcom.com>
+ * Copyright (C) 2008 Xorcom, Inc.
+ *
+ * All rights reserved.
+ *
+ * Based on dahdi_echocan_hpec.c, Copyright (C) 2006-2008 Digium, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ * 
+ * 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. 
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/ctype.h>
+#include <linux/moduleparam.h>
+
+/* Fix this if OSLEC is elsewhere */
+#include "../staging/echo/oslec.h"
+//#include <linux/oslec.h>
+/* "provide" struct echo_can_state */
+//#define oslec_state echo_can_state
+
+#include <dahdi/kernel.h>
+
+#define module_printk(level, fmt, args...) printk(level "%s: " fmt, THIS_MODULE->name, ## args)
+
+static void echo_can_free(struct echo_can_state *ec)
+{
+	oslec_free((struct oslec_state *)ec);
+}
+
+static void echo_can_update(struct echo_can_state *ec, short *iref, short *isig)
+{
+	oslec_update((struct oslec_state *)ec, *iref, *isig);
+}
+
+static int echo_can_create(struct dahdi_echocanparams *ecp, struct dahdi_echocanparam *p,
+			   struct echo_can_state **ec)
+{
+	if (ecp->param_count > 0) {
+		printk(KERN_WARNING "OSLEC does not support parameters; failing request\n");
+		return -EINVAL;
+	}
+
+	/* TODO: get adaption mode from EC parameters? */
+	*ec = (struct echo_can_state *)oslec_create(ecp->tap_length, 0);
+
+	return *ec ? 0 : -ENOTTY;
+}
+
+static inline int echo_can_traintap(struct echo_can_state *ec, int pos, short val)
+{
+	return 1;
+}
+
+static const struct dahdi_echocan me = {
+	.name = "OSLEC",
+	.owner = THIS_MODULE,
+	.echo_can_create = echo_can_create,
+	.echo_can_free = echo_can_free,
+	.echo_can_array_update = echo_can_update,
+	.echo_can_traintap = echo_can_traintap,
+};
+
+static int __init mod_init(void)
+{
+	if (dahdi_register_echocan(&me)) {
+		module_printk(KERN_ERR, "could not register with DAHDI core\n");
+
+		return -EPERM;
+	}
+
+	module_printk(KERN_INFO, "Registered echo canceler '%s'\n", me.name);
+
+	return 0;
+}
+
+static void __exit mod_exit(void)
+{
+	dahdi_unregister_echocan(&me);
+}
+
+MODULE_DESCRIPTION("DAHDI OSLEC wrapper");
+MODULE_AUTHOR("Tzafrir Cohen <tzafrir.cohen@xorcom.com>");
+MODULE_LICENSE("GPL");
+
+module_init(mod_init);
+module_exit(mod_exit);
-- 
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