512 lines
12 KiB
C
512 lines
12 KiB
C
/* OpenBSC Abis input driver for DAHDI */
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/* (C) 2008-2011 by Harald Welte <laforge@gnumonks.org>
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* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2010 by Digium and Matthew Fredrickson <creslin@digium.com>
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*
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* All Rights Reserved
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include "../../../bscconfig.h"
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#ifdef HAVE_DAHDI_USER_H
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <time.h>
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#include <sys/fcntl.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <arpa/inet.h>
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#include <dahdi/user.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/msgb.h>
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#include <openbsc/debug.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/abis_nm.h>
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#include <openbsc/abis_rsl.h>
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#include <openbsc/subchan_demux.h>
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#include <openbsc/e1_input.h>
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#include <openbsc/signal.h>
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#include <osmocom/core/talloc.h>
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#include "lapd.h"
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#define TS1_ALLOC_SIZE 300
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/* Corresponds to dahdi/user.h, only PRI related events */
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static const struct value_string dahdi_evt_names[] = {
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{ DAHDI_EVENT_NONE, "NONE" },
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{ DAHDI_EVENT_ALARM, "ALARM" },
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{ DAHDI_EVENT_NOALARM, "NOALARM" },
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{ DAHDI_EVENT_ABORT, "HDLC ABORT" },
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{ DAHDI_EVENT_OVERRUN, "HDLC OVERRUN" },
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{ DAHDI_EVENT_BADFCS, "HDLC BAD FCS" },
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{ DAHDI_EVENT_REMOVED, "REMOVED" },
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{ 0, NULL }
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};
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static void handle_dahdi_exception(struct e1inp_ts *ts)
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{
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int rc, evt;
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struct input_signal_data isd;
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rc = ioctl(ts->driver.dahdi.fd.fd, DAHDI_GETEVENT, &evt);
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if (rc < 0)
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return;
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LOGP(DMI, LOGL_NOTICE, "Line %u(%s) / TS %u DAHDI EVENT %s\n",
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ts->line->num, ts->line->name, ts->num,
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get_value_string(dahdi_evt_names, evt));
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isd.line = ts->line;
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switch (evt) {
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case DAHDI_EVENT_ALARM:
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/* we should notify the code that the line is gone */
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osmo_signal_dispatch(SS_INPUT, S_INP_LINE_ALARM, &isd);
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break;
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case DAHDI_EVENT_NOALARM:
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/* alarm has gone, we should re-start the SABM requests */
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osmo_signal_dispatch(SS_INPUT, S_INP_LINE_NOALARM, &isd);
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break;
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}
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}
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static int handle_ts1_read(struct osmo_fd *bfd)
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{
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struct e1inp_line *line = bfd->data;
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unsigned int ts_nr = bfd->priv_nr;
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struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
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struct msgb *msg = msgb_alloc(TS1_ALLOC_SIZE, "DAHDI TS1");
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lapd_mph_type prim;
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unsigned int sapi, tei;
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int ilen, ret, error = 0;
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uint8_t *idata;
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if (!msg)
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return -ENOMEM;
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ret = read(bfd->fd, msg->data, TS1_ALLOC_SIZE - 16);
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if (ret == -1)
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handle_dahdi_exception(e1i_ts);
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else if (ret < 0) {
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perror("read ");
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}
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msgb_put(msg, ret - 2);
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if (ret <= 3) {
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perror("read ");
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}
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sapi = msg->data[0] >> 2;
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tei = msg->data[1] >> 1;
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DEBUGP(DMI, "<= len = %d, sapi(%d) tei(%d)", ret, sapi, tei);
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idata = lapd_receive(e1i_ts->driver.dahdi.lapd, msg->data, msg->len, &ilen, &prim, &error);
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if (!idata) {
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switch(error) {
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case LAPD_ERR_UNKNOWN_TEI:
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/* We don't know about this TEI, probably the BSC
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* lost local states (it crashed or it was stopped),
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* notify the driver to see if it can do anything to
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* recover the existing signalling links with the BTS.
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*/
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e1inp_event(e1i_ts, S_INP_TEI_UNKNOWN, tei, sapi);
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return -EIO;
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}
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if (prim == 0)
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return -EIO;
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}
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msgb_pull(msg, 2);
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DEBUGP(DMI, "prim %08x\n", prim);
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switch (prim) {
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case 0:
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break;
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case LAPD_MPH_ACTIVATE_IND:
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DEBUGP(DMI, "MPH_ACTIVATE_IND: sapi(%d) tei(%d)\n", sapi, tei);
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ret = e1inp_event(e1i_ts, S_INP_TEI_UP, tei, sapi);
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break;
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case LAPD_MPH_DEACTIVATE_IND:
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DEBUGP(DMI, "MPH_DEACTIVATE_IND: sapi(%d) tei(%d)\n", sapi, tei);
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ret = e1inp_event(e1i_ts, S_INP_TEI_DN, tei, sapi);
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break;
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case LAPD_DL_DATA_IND:
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case LAPD_DL_UNITDATA_IND:
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if (prim == LAPD_DL_DATA_IND)
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msg->l2h = msg->data + 2;
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else
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msg->l2h = msg->data + 1;
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DEBUGP(DMI, "RX: %s\n", osmo_hexdump(msgb_l2(msg), ret));
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ret = e1inp_rx_ts(e1i_ts, msg, tei, sapi);
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break;
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default:
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printf("ERROR: unknown prim\n");
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break;
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}
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DEBUGP(DMI, "Returned ok\n");
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return ret;
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}
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static int ts_want_write(struct e1inp_ts *e1i_ts)
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{
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/* We never include the DAHDI B-Channel FD into the
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* writeset, since it doesn't support poll() based
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* write flow control */
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if (e1i_ts->type == E1INP_TS_TYPE_TRAU) {
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fprintf(stderr, "Trying to write TRAU ts\n");
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return 0;
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}
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e1i_ts->driver.dahdi.fd.when |= BSC_FD_WRITE;
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return 0;
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}
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static void timeout_ts1_write(void *data)
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{
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struct e1inp_ts *e1i_ts = (struct e1inp_ts *)data;
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/* trigger write of ts1, due to tx delay timer */
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ts_want_write(e1i_ts);
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}
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static void dahdi_write_msg(uint8_t *data, int len, void *cbdata)
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{
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struct osmo_fd *bfd = cbdata;
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struct e1inp_line *line = bfd->data;
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unsigned int ts_nr = bfd->priv_nr;
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struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
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int ret;
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ret = write(bfd->fd, data, len + 2);
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if (ret == -1)
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handle_dahdi_exception(e1i_ts);
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else if (ret < 0)
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LOGP(DMI, LOGL_NOTICE, "%s write failed %d\n", __func__, ret);
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}
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static int handle_ts1_write(struct osmo_fd *bfd)
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{
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struct e1inp_line *line = bfd->data;
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unsigned int ts_nr = bfd->priv_nr;
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struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
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struct e1inp_sign_link *sign_link;
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struct msgb *msg;
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bfd->when &= ~BSC_FD_WRITE;
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/* get the next msg for this timeslot */
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msg = e1inp_tx_ts(e1i_ts, &sign_link);
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if (!msg) {
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/* no message after tx delay timer */
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return 0;
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}
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DEBUGP(DMI, "TX: %s\n", osmo_hexdump(msg->data, msg->len));
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lapd_transmit(e1i_ts->driver.dahdi.lapd, sign_link->tei,
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sign_link->sapi, msg->data, msg->len);
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msgb_free(msg);
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/* set tx delay timer for next event */
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e1i_ts->sign.tx_timer.cb = timeout_ts1_write;
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e1i_ts->sign.tx_timer.data = e1i_ts;
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osmo_timer_schedule(&e1i_ts->sign.tx_timer, 0, 50000);
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return 0;
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}
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static int invertbits = 1;
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static uint8_t flip_table[256];
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static void init_flip_bits(void)
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{
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int i,k;
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for (i = 0 ; i < 256 ; i++) {
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uint8_t sample = 0 ;
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for (k = 0; k<8; k++) {
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if ( i & 1 << k ) sample |= 0x80 >> k;
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}
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flip_table[i] = sample;
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}
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}
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static uint8_t * flip_buf_bits ( uint8_t * buf , int len)
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{
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int i;
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uint8_t * start = buf;
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for (i = 0 ; i < len; i++) {
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buf[i] = flip_table[(uint8_t)buf[i]];
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}
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return start;
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}
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#define D_BCHAN_TX_GRAN 160
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/* write to a B channel TS */
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static int handle_tsX_write(struct osmo_fd *bfd)
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{
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struct e1inp_line *line = bfd->data;
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unsigned int ts_nr = bfd->priv_nr;
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struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
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uint8_t tx_buf[D_BCHAN_TX_GRAN];
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struct subch_mux *mx = &e1i_ts->trau.mux;
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int ret;
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ret = subchan_mux_out(mx, tx_buf, D_BCHAN_TX_GRAN);
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if (ret != D_BCHAN_TX_GRAN) {
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fprintf(stderr, "Huh, got ret of %d\n", ret);
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if (ret < 0)
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return ret;
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}
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DEBUGP(DMIB, "BCHAN TX: %s\n",
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osmo_hexdump(tx_buf, D_BCHAN_TX_GRAN));
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if (invertbits) {
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flip_buf_bits(tx_buf, ret);
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}
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ret = write(bfd->fd, tx_buf, ret);
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if (ret < D_BCHAN_TX_GRAN)
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fprintf(stderr, "send returns %d instead of %d\n", ret,
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D_BCHAN_TX_GRAN);
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return ret;
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}
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#define D_TSX_ALLOC_SIZE (D_BCHAN_TX_GRAN)
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/* FIXME: read from a B channel TS */
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static int handle_tsX_read(struct osmo_fd *bfd)
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{
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struct e1inp_line *line = bfd->data;
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unsigned int ts_nr = bfd->priv_nr;
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struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
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struct msgb *msg = msgb_alloc(D_TSX_ALLOC_SIZE, "DAHDI TSx");
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int ret;
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if (!msg)
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return -ENOMEM;
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ret = read(bfd->fd, msg->data, D_TSX_ALLOC_SIZE);
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if (ret < 0 || ret != D_TSX_ALLOC_SIZE) {
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fprintf(stderr, "read error %d %s\n", ret, strerror(errno));
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return ret;
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}
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if (invertbits) {
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flip_buf_bits(msg->data, ret);
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}
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msgb_put(msg, ret);
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msg->l2h = msg->data;
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DEBUGP(DMIB, "BCHAN RX: %s\n",
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osmo_hexdump(msgb_l2(msg), ret));
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ret = e1inp_rx_ts(e1i_ts, msg, 0, 0);
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/* physical layer indicates that data has been sent,
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* we thus can send some more data */
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ret = handle_tsX_write(bfd);
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msgb_free(msg);
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return ret;
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}
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/* callback from select.c in case one of the fd's can be read/written */
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static int dahdi_fd_cb(struct osmo_fd *bfd, unsigned int what)
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{
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struct e1inp_line *line = bfd->data;
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unsigned int ts_nr = bfd->priv_nr;
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unsigned int idx = ts_nr-1;
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struct e1inp_ts *e1i_ts = &line->ts[idx];
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int rc = 0;
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switch (e1i_ts->type) {
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case E1INP_TS_TYPE_SIGN:
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if (what & BSC_FD_EXCEPT)
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handle_dahdi_exception(e1i_ts);
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if (what & BSC_FD_READ)
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rc = handle_ts1_read(bfd);
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if (what & BSC_FD_WRITE)
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rc = handle_ts1_write(bfd);
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break;
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case E1INP_TS_TYPE_TRAU:
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if (what & BSC_FD_EXCEPT)
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handle_dahdi_exception(e1i_ts);
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if (what & BSC_FD_READ)
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rc = handle_tsX_read(bfd);
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if (what & BSC_FD_WRITE)
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rc = handle_tsX_write(bfd);
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/* We never include the DAHDI B-Channel FD into the
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* writeset, since it doesn't support poll() based
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* write flow control */
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break;
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default:
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fprintf(stderr, "unknown E1 TS type %u\n", e1i_ts->type);
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break;
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}
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return rc;
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}
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static int dahdi_e1_line_update(struct e1inp_line *line);
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struct e1inp_driver dahdi_driver = {
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.name = "dahdi",
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.want_write = ts_want_write,
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.line_update = &dahdi_e1_line_update,
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};
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void dahdi_set_bufinfo(int fd, int as_sigchan)
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{
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struct dahdi_bufferinfo bi;
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int x = 0;
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if (ioctl(fd, DAHDI_GET_BUFINFO, &bi)) {
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fprintf(stderr, "Error getting bufinfo\n");
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exit(-1);
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}
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if (as_sigchan) {
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bi.numbufs = 4;
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bi.bufsize = 512;
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} else {
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bi.numbufs = 8;
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bi.bufsize = D_BCHAN_TX_GRAN;
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bi.txbufpolicy = DAHDI_POLICY_WHEN_FULL;
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}
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if (ioctl(fd, DAHDI_SET_BUFINFO, &bi)) {
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fprintf(stderr, "Error setting bufinfo\n");
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exit(-1);
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}
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if (!as_sigchan) {
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if (ioctl(fd, DAHDI_AUDIOMODE, &x)) {
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fprintf(stderr, "Error setting bufinfo\n");
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exit(-1);
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}
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} else {
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int one = 1;
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ioctl(fd, DAHDI_HDLCFCSMODE, &one);
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/* we cannot reliably check for the ioctl return value here
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* as this command will fail if the slot _already_ was a
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* signalling slot before :( */
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}
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}
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static int dahdi_e1_setup(struct e1inp_line *line)
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{
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int ts, ret;
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/* TS0 is CRC4, don't need any fd for it */
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for (ts = 1; ts < NUM_E1_TS; ts++) {
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unsigned int idx = ts-1;
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char openstr[128];
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struct e1inp_ts *e1i_ts = &line->ts[idx];
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struct osmo_fd *bfd = &e1i_ts->driver.dahdi.fd;
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int dev_nr;
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/* DAHDI device names/numbers just keep incrementing
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* even over multiple boards. So TS1 of the second
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* board will be 32 */
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dev_nr = line->num * (NUM_E1_TS-1) + ts;
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bfd->data = line;
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bfd->priv_nr = ts;
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bfd->cb = dahdi_fd_cb;
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snprintf(openstr, sizeof(openstr), "/dev/dahdi/%d", dev_nr);
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switch (e1i_ts->type) {
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case E1INP_TS_TYPE_NONE:
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continue;
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break;
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case E1INP_TS_TYPE_SIGN:
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bfd->fd = open(openstr, O_RDWR | O_NONBLOCK);
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if (bfd->fd == -1) {
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fprintf(stderr, "%s could not open %s %s\n",
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__func__, openstr, strerror(errno));
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exit(-1);
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}
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bfd->when = BSC_FD_READ | BSC_FD_EXCEPT;
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dahdi_set_bufinfo(bfd->fd, 1);
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e1i_ts->driver.dahdi.lapd = lapd_instance_alloc(1, dahdi_write_msg, bfd);
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break;
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case E1INP_TS_TYPE_TRAU:
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bfd->fd = open(openstr, O_RDWR | O_NONBLOCK);
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if (bfd->fd == -1) {
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fprintf(stderr, "%s could not open %s %s\n",
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__func__, openstr, strerror(errno));
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exit(-1);
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}
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dahdi_set_bufinfo(bfd->fd, 0);
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/* We never include the DAHDI B-Channel FD into the
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* writeset, since it doesn't support poll() based
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* write flow control */
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bfd->when = BSC_FD_READ | BSC_FD_EXCEPT;// | BSC_FD_WRITE;
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break;
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}
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if (bfd->fd < 0) {
|
|
fprintf(stderr, "%s could not open %s %s\n",
|
|
__func__, openstr, strerror(errno));
|
|
return bfd->fd;
|
|
}
|
|
|
|
ret = osmo_fd_register(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)
|
|
{
|
|
if (line->driver != &dahdi_driver)
|
|
return -EINVAL;
|
|
|
|
return dahdi_e1_setup(line);
|
|
}
|
|
|
|
int e1inp_dahdi_init(void)
|
|
{
|
|
init_flip_bits();
|
|
|
|
/* register the driver with the core */
|
|
return e1inp_driver_register(&dahdi_driver);
|
|
}
|
|
|
|
#endif /* HAVE_DAHDI_USER_H */
|