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osmo-msc/openbsc/src/input/dahdi.c

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/* OpenBSC Abis input driver for DAHDI */
/* (C) 2008-2011 by Harald Welte <laforge@gnumonks.org>
* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2010 by Digium and Matthew Fredrickson <creslin@digium.com>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include "../../bscconfig.h"
#ifdef HAVE_DAHDI_USER_H
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <sys/fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <dahdi/user.h>
#include <osmocore/select.h>
#include <osmocore/msgb.h>
#include <openbsc/debug.h>
#include <openbsc/gsm_data.h>
#include <openbsc/abis_nm.h>
#include <openbsc/abis_rsl.h>
#include <openbsc/subchan_demux.h>
#include <openbsc/e1_input.h>
#include <osmocore/talloc.h>
#include "lapd.h"
#define TS1_ALLOC_SIZE 300
static int handle_ts1_read(struct bsc_fd *bfd)
{
struct e1inp_line *line = bfd->data;
unsigned int ts_nr = bfd->priv_nr;
struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
struct e1inp_sign_link *link;
struct msgb *msg = msgb_alloc(TS1_ALLOC_SIZE, "DAHDI TS1");
lapd_mph_type prim;
unsigned int sapi, tei;
int ilen, ret;
if (!msg)
return -ENOMEM;
ret = read(bfd->fd, msg->data, TS1_ALLOC_SIZE - 16);
if (ret < 0) {
perror("read ");
}
msgb_put(msg, ret - 2);
if (ret <= 3) {
perror("read ");
}
sapi = msg->data[0] >> 2;
tei = msg->data[1] >> 1;
DEBUGP(DMI, "<= len = %d, sapi(%d) tei(%d)", ret, sapi, tei);
uint8_t *idata = lapd_receive(msg->data, msg->len, &ilen, &prim, bfd);
msgb_pull(msg, 2);
DEBUGP(DMI, "prim %08x\n", prim);
switch (prim) {
case 0:
break;
case LAPD_MPH_ACTIVATE_IND:
DEBUGP(DMI, "MPH_ACTIVATE_IND: sapi(%d) tei(%d)\n", sapi, tei);
ret = e1inp_event(e1i_ts, EVT_E1_TEI_UP, tei, sapi);
break;
case LAPD_MPH_DEACTIVATE_IND:
DEBUGP(DMI, "MPH_DEACTIVATE_IND: sapi(%d) tei(%d)\n", sapi, tei);
ret = e1inp_event(e1i_ts, EVT_E1_TEI_DN, tei, sapi);
break;
case LAPD_DL_DATA_IND:
case LAPD_DL_UNITDATA_IND:
if (prim == LAPD_DL_DATA_IND)
msg->l2h = msg->data + 2;
else
msg->l2h = msg->data + 1;
DEBUGP(DMI, "RX: %s\n", hexdump(msgb_l2(msg), ret));
ret = e1inp_rx_ts(e1i_ts, msg, tei, sapi);
break;
default:
printf("ERROR: unknown prim\n");
break;
}
DEBUGP(DMI, "Returned ok\n");
return ret;
}
static int ts_want_write(struct e1inp_ts *e1i_ts)
{
/* We never include the DAHDI B-Channel FD into the
* writeset, since it doesn't support poll() based
* write flow control */
if (e1i_ts->type == E1INP_TS_TYPE_TRAU) {
fprintf(stderr, "Trying to write TRAU ts\n");
return 0;
}
e1i_ts->driver.misdn.fd.when |= BSC_FD_WRITE;
return 0;
}
static void timeout_ts1_write(void *data)
{
struct e1inp_ts *e1i_ts = (struct e1inp_ts *)data;
/* trigger write of ts1, due to tx delay timer */
ts_want_write(e1i_ts);
}
static void dahdi_write_msg(uint8_t *data, int len, void *cbdata)
{
struct bsc_fd *bfd = cbdata;
int ret;
ret = write(bfd->fd, data, len + 2);
if (ret < 0)
fprintf(stderr, "%s write failed %d\n", __func__, ret);
}
static int handle_ts1_write(struct bsc_fd *bfd)
{
struct e1inp_line *line = bfd->data;
unsigned int ts_nr = bfd->priv_nr;
struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
struct e1inp_sign_link *sign_link;
struct msgb *msg;
bfd->when &= ~BSC_FD_WRITE;
/* get the next msg for this timeslot */
msg = e1inp_tx_ts(e1i_ts, &sign_link);
if (!msg) {
/* no message after tx delay timer */
return 0;
}
lapd_transmit(sign_link->tei, msg->data, msg->len, bfd);
msgb_free(msg);
/* set tx delay timer for next event */
e1i_ts->sign.tx_timer.cb = timeout_ts1_write;
e1i_ts->sign.tx_timer.data = e1i_ts;
bsc_schedule_timer(&e1i_ts->sign.tx_timer, 0, 50000);
return 0;
}
static int invertbits = 1;
static u_int8_t flip_table[256];
static void init_flip_bits(void)
{
int i,k;
for (i = 0 ; i < 256 ; i++) {
u_int8_t sample = 0 ;
for (k = 0; k<8; k++) {
if ( i & 1 << k ) sample |= 0x80 >> k;
}
flip_table[i] = sample;
}
}
static u_int8_t * flip_buf_bits ( u_int8_t * buf , int len)
{
int i;
u_int8_t * start = buf;
for (i = 0 ; i < len; i++) {
buf[i] = flip_table[(u_int8_t)buf[i]];
}
return start;
}
#define D_BCHAN_TX_GRAN 160
/* write to a B channel TS */
static int handle_tsX_write(struct bsc_fd *bfd)
{
struct e1inp_line *line = bfd->data;
unsigned int ts_nr = bfd->priv_nr;
struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
u_int8_t tx_buf[D_BCHAN_TX_GRAN];
struct subch_mux *mx = &e1i_ts->trau.mux;
int ret;
ret = subchan_mux_out(mx, tx_buf, D_BCHAN_TX_GRAN);
if (ret != D_BCHAN_TX_GRAN) {
fprintf(stderr, "Huh, got ret of %d\n", ret);
if (ret < 0)
return ret;
}
DEBUGP(DMIB, "BCHAN TX: %s\n",
hexdump(tx_buf, D_BCHAN_TX_GRAN));
if (invertbits) {
flip_buf_bits(tx_buf, ret);
}
ret = write(bfd->fd, tx_buf, ret);
if (ret < D_BCHAN_TX_GRAN)
fprintf(stderr, "send returns %d instead of %d\n", ret,
D_BCHAN_TX_GRAN);
return ret;
}
#define D_TSX_ALLOC_SIZE (D_BCHAN_TX_GRAN)
/* FIXME: read from a B channel TS */
static int handle_tsX_read(struct bsc_fd *bfd)
{
struct e1inp_line *line = bfd->data;
unsigned int ts_nr = bfd->priv_nr;
struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
struct msgb *msg = msgb_alloc(D_TSX_ALLOC_SIZE, "DAHDI TSx");
int ret;
if (!msg)
return -ENOMEM;
ret = read(bfd->fd, msg->data, D_TSX_ALLOC_SIZE);
if (ret < 0 || ret != D_TSX_ALLOC_SIZE) {
fprintf(stderr, "read error %d %s\n", ret, strerror(errno));
return ret;
}
if (invertbits) {
flip_buf_bits(msg->data, ret);
}
msgb_put(msg, ret);
msg->l2h = msg->data;
DEBUGP(DMIB, "BCHAN RX: %s\n",
hexdump(msgb_l2(msg), ret));
ret = e1inp_rx_ts(e1i_ts, msg, 0, 0);
/* physical layer indicates that data has been sent,
* we thus can send some more data */
ret = handle_tsX_write(bfd);
msgb_free(msg);
return ret;
}
/* callback from select.c in case one of the fd's can be read/written */
static int dahdi_fd_cb(struct bsc_fd *bfd, unsigned int what)
{
struct e1inp_line *line = bfd->data;
unsigned int ts_nr = bfd->priv_nr;
unsigned int idx = ts_nr-1;
struct e1inp_ts *e1i_ts = &line->ts[idx];
int rc = 0;
switch (e1i_ts->type) {
case E1INP_TS_TYPE_SIGN:
if (what & BSC_FD_READ)
rc = handle_ts1_read(bfd);
if (what & BSC_FD_WRITE)
rc = handle_ts1_write(bfd);
break;
case E1INP_TS_TYPE_TRAU:
if (what & BSC_FD_READ)
rc = handle_tsX_read(bfd);
if (what & BSC_FD_WRITE)
rc = handle_tsX_write(bfd);
/* We never include the DAHDI B-Channel FD into the
* writeset, since it doesn't support poll() based
* write flow control */
break;
default:
fprintf(stderr, "unknown E1 TS type %u\n", e1i_ts->type);
break;
}
return rc;
}
static int dahdi_e1_line_update(struct e1inp_line *line);
struct e1inp_driver dahdi_driver = {
.name = "DAHDI",
.want_write = ts_want_write,
.line_update = &dahdi_e1_line_update,
};
void dahdi_set_bufinfo(int fd, int as_sigchan)
{
struct dahdi_bufferinfo bi;
int x = 0;
if (ioctl(fd, DAHDI_GET_BUFINFO, &bi)) {
fprintf(stderr, "Error getting bufinfo\n");
exit(-1);
}
if (as_sigchan) {
bi.numbufs = 4;
bi.bufsize = 512;
} else {
bi.numbufs = 8;
bi.bufsize = D_BCHAN_TX_GRAN;
bi.txbufpolicy = DAHDI_POLICY_WHEN_FULL;
}
if (ioctl(fd, DAHDI_SET_BUFINFO, &bi)) {
fprintf(stderr, "Error setting bufinfo\n");
exit(-1);
}
if (!as_sigchan) {
if (ioctl(fd, DAHDI_AUDIOMODE, &x)) {
fprintf(stderr, "Error setting bufinfo\n");
exit(-1);
}
}
}
static int mi_e1_setup(struct e1inp_line *line, int release_l2)
{
int ts, ret;
/* TS0 is CRC4, don't need any fd for it */
for (ts = 1; ts < NUM_E1_TS; ts++) {
unsigned int idx = ts-1;
char openstr[128];
struct e1inp_ts *e1i_ts = &line->ts[idx];
struct bsc_fd *bfd = &e1i_ts->driver.misdn.fd;
bfd->data = line;
bfd->priv_nr = ts;
bfd->cb = dahdi_fd_cb;
snprintf(openstr, sizeof(openstr), "/dev/dahdi/%d", ts);
switch (e1i_ts->type) {
case E1INP_TS_TYPE_NONE:
continue;
break;
case E1INP_TS_TYPE_SIGN:
bfd->fd = open(openstr, O_RDWR | O_NONBLOCK);
if (bfd->fd == -1) {
fprintf(stderr, "%s could not open %s %s\n",
__func__, openstr, strerror(errno));
exit(-1);
}
bfd->when = BSC_FD_READ;
dahdi_set_bufinfo(bfd->fd, 1);
break;
case E1INP_TS_TYPE_TRAU:
bfd->fd = open(openstr, O_RDWR | O_NONBLOCK);
if (bfd->fd == -1) {
fprintf(stderr, "%s could not open %s %s\n",
__func__, openstr, strerror(errno));
exit(-1);
}
dahdi_set_bufinfo(bfd->fd, 0);
/* We never include the DAHDI B-Channel FD into the
* writeset, since it doesn't support poll() based
* write flow control */
bfd->when = BSC_FD_READ;// | BSC_FD_WRITE;
break;
}
if (bfd->fd < 0) {
fprintf(stderr, "%s could not open %s %s\n",
__func__, openstr, strerror(errno));
return bfd->fd;
}
ret = bsc_register_fd(bfd);
if (ret < 0) {
fprintf(stderr, "could not register FD: %s\n",
strerror(ret));
return ret;
}
}
return 0;
}
static int dahdi_e1_line_update(struct e1inp_line *line)
{
int ret;
if (!line->driver) {
/* this must be the first update */
line->driver = &dahdi_driver;
} else {
/* this is a subsequent update */
/* FIXME: first close all sockets */
fprintf(stderr, "incremental line updates not supported yet\n");
return 0;
}
if (line->driver != &dahdi_driver)
return -EINVAL;
init_flip_bits();
ret = mi_e1_setup(line, 1);
if (ret)
return ret;
lapd_transmit_cb = dahdi_write_msg;
return 0;
}
int e1inp_dahdi_init(void)
{
/* register the driver with the core */
e1inp_driver_register(&dahdi_driver);
}
#endif /* HAVE_DAHDI_USER_H */
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