D-Modem/slmodemd/dp_dummy.c
2021-10-29 14:41:03 -04:00

153 lines
3.7 KiB
C

/*
*
* Copyright (c) 2002, Smart Link Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* 3. Neither the name of the Smart Link Ltd. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*
*
* dp_dummy.c -- dummy data pump (very stupid simulator).
*
* Author: Sasha K (sashak@smlink.com)
*
*
*/
#include <modem.h>
#include <modem_debug.h>
#define DUMMY_SKIP 100
#define DUMMY_TIMEOUT 300
#define DUMMY_A1 0xff
struct dummy_dp {
struct dp dp;
unsigned long count;
unsigned long linked;
u8 buf[1024];
void *dcr;
};
static struct dp *dummy_create(struct modem *m, enum DP_ID id,
int caller, int srate, int max_frag,
struct dp_operations *op)
{
struct dummy_dp *d;
dprintf("dummy_create...\n");
d = malloc(sizeof(*d));
memset(d,0,sizeof(*d));
d->dp.id = id;
d->dp.modem = m;
d->dp.op = op;
d->dp.dp_data = d;
d->dcr = m->dcr;
m->dcr = NULL;
return (struct dp *)d;
}
static int dummy_delete(struct dp *dp)
{
struct dummy_dp *d = (struct dummy_dp *)dp;
dprintf("dummy_delete...\n");
dp->modem->dcr = d->dcr;
free(d);
return 0;
}
static int dummy_process(struct dp *dp, void *in, void *out, int cnt)
{
struct dummy_dp *d = (struct dummy_dp *)dp;
int n = cnt << MFMT_SHIFT(dp->modem->format);
s16 *s;
int i;
d->count++;
if (!d->linked) {
if (d->count < DUMMY_SKIP) {
memset(out,0,n);
return DPSTAT_OK;
}
else if(d->count > DUMMY_TIMEOUT)
return DPSTAT_ERROR;
s = out;
for(i = 0 ; i < cnt ; i++) {
*s = (1-2*(i&1))*('A');
s++;
}
s = in;
for(i = 0 ; i < cnt ; i++) {
if(abs(*s) == 'A') {
d->linked = 1;
return DPSTAT_CONNECT;
}
s++;
}
}
else {
s = in;
for(i = 0 ; i < cnt ; i++) {
d->buf[i] = *s&0x1;
s++;
}
modem_put_bits(dp->modem,1,d->buf,cnt);
s = out;
modem_get_bits(dp->modem,1,d->buf,cnt);
for(i = 0 ; i < cnt ; i++) {
*s = d->buf[i]&1 ;
s++;
}
}
return DPSTAT_OK;
}
static struct dp_operations dummy_operations = {
name : "Dummy DataPump driver",
create: dummy_create,
delete: dummy_delete,
process:dummy_process
};
int dp_dummy_init(void)
{
return modem_dp_register(DP_DUMMY,&dummy_operations);
}
void dp_dummy_exit(void)
{
modem_dp_deregister(DP_DUMMY,&dummy_operations);
}