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/*
* DAHDI Telephony Interface to Digium High-Performance Echo Canceller
*
* Copyright (C) 2006-2008 Digium, Inc.
*
* 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 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>
#include <dahdi/kernel.h>
static int debug;
#define module_printk(level, fmt, args...) printk(level "%s: " fmt, THIS_MODULE->name, ## args)
#define debug_printk(level, fmt, args...) if (debug >= level) printk(KERN_DEBUG "%s (%s): " fmt, THIS_MODULE->name, __FUNCTION__, ## args)
#include "hpec_user.h"
#include "hpec.h"
static int __attribute__((regparm(0))) __attribute__((format (printf, 1, 2))) logger(const char *format, ...)
{
int res;
va_list args;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,9)
va_start(args, format);
res = vprintk(format, args);
va_end(args);
#else
char buf[256];
va_start(args, format);
res = vsnprintf(buf, sizeof(buf), format, args);
va_end(args);
printk(KERN_INFO "%s" buf);
#endif
return res;
}
static void *memalloc(size_t len)
{
return kmalloc(len, GFP_KERNEL);
}
static void memfree(void *ptr)
{
kfree(ptr);
}
static void echo_can_free(struct echo_can_state *ec)
{
hpec_channel_free(ec);
}
static void echo_can_array_update(struct echo_can_state *ec, short *isig, short *iref)
{
hpec_channel_update(ec, isig, iref);
}
DECLARE_MUTEX(alloc_lock);
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 "HPEC does not support parameters; failing request\n");
return -EINVAL;
}
if (down_interruptible(&alloc_lock))
return -ENOTTY;
*ec = hpec_channel_alloc(ecp->tap_length);
up(&alloc_lock);
return *ec ? 0 : -ENOTTY;
}
static inline int echo_can_traintap(struct echo_can_state *ec, int pos, short val)
{
return 1;
}
DECLARE_MUTEX(license_lock);
static int hpec_license_ioctl(unsigned int cmd, unsigned long data)
{
struct hpec_challenge challenge;
struct hpec_license license;
int result = 0;
switch (cmd) {
case DAHDI_EC_LICENSE_CHALLENGE:
if (down_interruptible(&license_lock))
return -EINTR;
memset(&challenge, 0, sizeof(challenge));
if (hpec_license_challenge(&challenge))
result = -ENODEV;
if (!result && copy_to_user((unsigned char *) data, &challenge, sizeof(challenge)))
result = -EFAULT;
up(&license_lock);
return result;
case DAHDI_EC_LICENSE_RESPONSE:
if (down_interruptible(&license_lock))
return -EINTR;
if (copy_from_user(&license, (unsigned char *) data, sizeof(license)))
result = -EFAULT;
if (!result && hpec_license_check(&license))
result = -EACCES;
up(&license_lock);
return result;
default:
return -ENOSYS;
}
}
static const struct dahdi_echocan me = {
.name = "HPEC",
.owner = THIS_MODULE,
.echo_can_create = echo_can_create,
.echo_can_free = echo_can_free,
.echo_can_array_update = echo_can_array_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_NOTICE, "Registered echo canceler '%s'\n", me.name);
hpec_init(logger, debug, DAHDI_CHUNKSIZE, memalloc, memfree);
dahdi_set_hpec_ioctl(hpec_license_ioctl);
return 0;
}
static void __exit mod_exit(void)
{
dahdi_unregister_echocan(&me);
dahdi_set_hpec_ioctl(NULL);
hpec_shutdown();
}
module_param(debug, int, S_IRUGO | S_IWUSR);
MODULE_DESCRIPTION("DAHDI High Performance Echo Canceller");
MODULE_AUTHOR("Kevin P. Fleming <kpfleming@digium.com>");
MODULE_LICENSE("Digium Commercial");
module_init(mod_init);
module_exit(mod_exit);
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