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/*
* Zapata Telephony Interface to Digium High-Performance Echo Canceller
*
* Copyright (C) 2006 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 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.
*/
#if !defined(_HPEC_ZAPTEL_H)
#define _HPEC_ZAPTEL_H
#define ZT_EC_ARRAY_UPDATE
#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(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_init(void)
{
printk("Zaptel Echo Canceller: Digium High-Performance Echo Canceller\n");
hpec_init(logger, debug, ZT_CHUNKSIZE, memalloc, memfree);
}
static void echo_can_identify(char *buf, size_t len)
{
strncpy(buf, "HPEC", len);
}
static void echo_can_shutdown(void)
{
hpec_shutdown();
}
static inline void echo_can_free(struct echo_can_state *ec)
{
hpec_channel_free(ec);
}
static inline void echo_can_array_update(struct echo_can_state *ec, short *iref, short *isig)
{
hpec_channel_update(ec, iref, isig);
}
DECLARE_MUTEX(alloc_lock);
static int echo_can_create(struct zt_echocanparams *ecp, struct zt_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 ZT_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 ZT_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;
}
}
#endif /* !defined(_HPEC_ZAPTEL_H) */
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