bf3fe05dfb
This needs some more testing before it's on by default. If the card is otherwise functioning, these messages may be confusing to the user. If the card is not functioning, the driver can be reloaded with debug to check for this condition. Signed-off-by: Shaun Ruffell <sruffell@digium.com> git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9205 a0bf4364-ded3-4de4-8d8a-66a801d63aff
145 lines
3.9 KiB
C
145 lines
3.9 KiB
C
/*
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* DAHDI Telephony Interface to the Open Source Line Echo Canceller (OSLEC)
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*
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* Written by Tzafrir Cohen <tzafrir.cohen@xorcom.com>
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* Copyright (C) 2008 Xorcom, Inc.
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*
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* All rights reserved.
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*
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* Based on dahdi_echocan_hpec.c, Copyright (C) 2006-2008 Digium, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/ctype.h>
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#include <linux/moduleparam.h>
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/* Fix this if OSLEC is elsewhere */
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#include "../staging/echo/oslec.h"
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//#include <linux/oslec.h>
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#include <dahdi/kernel.h>
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#define module_printk(level, fmt, args...) printk(level "%s: " fmt, THIS_MODULE->name, ## args)
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static int echo_can_create(struct dahdi_chan *chan, struct dahdi_echocanparams *ecp,
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struct dahdi_echocanparam *p, struct dahdi_echocan_state **ec);
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static void echo_can_free(struct dahdi_chan *chan, struct dahdi_echocan_state *ec);
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static void echo_can_process(struct dahdi_echocan_state *ec, short *isig, const short *iref, u32 size);
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static int echo_can_traintap(struct dahdi_echocan_state *ec, int pos, short val);
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static const struct dahdi_echocan_factory my_factory = {
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.name = "OSLEC",
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.owner = THIS_MODULE,
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.echocan_create = echo_can_create,
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};
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static const struct dahdi_echocan_ops my_ops = {
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.name = "OSLEC",
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.echocan_free = echo_can_free,
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.echocan_process = echo_can_process,
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.echocan_traintap = echo_can_traintap,
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};
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struct ec_pvt {
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struct oslec_state *oslec;
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struct dahdi_echocan_state dahdi;
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};
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#define dahdi_to_pvt(a) container_of(a, struct ec_pvt, dahdi)
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static void echo_can_free(struct dahdi_chan *chan, struct dahdi_echocan_state *ec)
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{
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struct ec_pvt *pvt = dahdi_to_pvt(ec);
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oslec_free(pvt->oslec);
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kfree(pvt);
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}
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static void echo_can_process(struct dahdi_echocan_state *ec, short *isig, const short *iref, u32 size)
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{
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struct ec_pvt *pvt = dahdi_to_pvt(ec);
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u32 SampleNum;
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for (SampleNum = 0; SampleNum < size; SampleNum++, iref++) {
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short iCleanSample;
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iCleanSample = oslec_update(pvt->oslec, *iref, *isig);
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*isig++ = iCleanSample;
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}
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}
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static int echo_can_create(struct dahdi_chan *chan, struct dahdi_echocanparams *ecp,
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struct dahdi_echocanparam *p, struct dahdi_echocan_state **ec)
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{
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struct ec_pvt *pvt;
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if (ecp->param_count > 0) {
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printk(KERN_WARNING "OSLEC does not support parameters; failing request\n");
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return -EINVAL;
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}
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pvt = kzalloc(sizeof(*pvt), GFP_KERNEL);
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if (!pvt)
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return -ENOMEM;
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pvt->dahdi.ops = &my_ops;
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pvt->oslec = oslec_create(ecp->tap_length, ECHO_CAN_USE_ADAPTION | ECHO_CAN_USE_NLP | ECHO_CAN_USE_CLIP | ECHO_CAN_USE_TX_HPF | ECHO_CAN_USE_RX_HPF);
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if (!pvt->oslec) {
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kfree(pvt);
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*ec = NULL;
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return -ENOTTY;
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} else {
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*ec = &pvt->dahdi;
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return 0;
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}
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}
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static int echo_can_traintap(struct dahdi_echocan_state *ec, int pos, short val)
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{
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return 1;
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}
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static int __init mod_init(void)
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{
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if (dahdi_register_echocan_factory(&my_factory)) {
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module_printk(KERN_ERR, "could not register with DAHDI core\n");
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return -EPERM;
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}
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module_printk(KERN_INFO, "Registered echo canceler '%s'\n", my_factory.name);
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return 0;
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}
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static void __exit mod_exit(void)
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{
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dahdi_unregister_echocan_factory(&my_factory);
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}
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MODULE_DESCRIPTION("DAHDI OSLEC wrapper");
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MODULE_AUTHOR("Tzafrir Cohen <tzafrir.cohen@xorcom.com>");
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MODULE_LICENSE("GPL");
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module_init(mod_init);
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module_exit(mod_exit);
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