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-rw-r--r--src/libabis/input/dahdi.c494
1 files changed, 494 insertions, 0 deletions
diff --git a/src/libabis/input/dahdi.c b/src/libabis/input/dahdi.c
new file mode 100644
index 00000000..572bb5ae
--- /dev/null
+++ b/src/libabis/input/dahdi.c
@@ -0,0 +1,494 @@
+/* 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 <openbsc/signal.h>
+#include <osmocore/talloc.h>
+
+#include "lapd.h"
+
+#define TS1_ALLOC_SIZE 300
+
+/* Corresponds to dahdi/user.h, only PRI related events */
+static const struct value_string dahdi_evt_names[] = {
+ { DAHDI_EVENT_NONE, "NONE" },
+ { DAHDI_EVENT_ALARM, "ALARM" },
+ { DAHDI_EVENT_NOALARM, "NOALARM" },
+ { DAHDI_EVENT_ABORT, "HDLC ABORT" },
+ { DAHDI_EVENT_OVERRUN, "HDLC OVERRUN" },
+ { DAHDI_EVENT_BADFCS, "HDLC BAD FCS" },
+ { DAHDI_EVENT_REMOVED, "REMOVED" },
+ { 0, NULL }
+};
+
+static void handle_dahdi_exception(struct e1inp_ts *ts)
+{
+ int rc, evt;
+ struct input_signal_data isd;
+
+ rc = ioctl(ts->driver.dahdi.fd.fd, DAHDI_GETEVENT, &evt);
+ if (rc < 0)
+ return;
+
+ LOGP(DMI, LOGL_NOTICE, "Line %u(%s) / TS %u DAHDI EVENT %s\n",
+ ts->line->num, ts->line->name, ts->num,
+ get_value_string(dahdi_evt_names, evt));
+
+ isd.line = ts->line;
+
+ switch (evt) {
+ case DAHDI_EVENT_ALARM:
+ /* we should notify the code that the line is gone */
+ dispatch_signal(SS_INPUT, S_INP_LINE_ALARM, &isd);
+ break;
+ case DAHDI_EVENT_NOALARM:
+ /* alarm has gone, we should re-start the SABM requests */
+ dispatch_signal(SS_INPUT, S_INP_LINE_NOALARM, &isd);
+ break;
+ }
+}
+
+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 msgb *msg = msgb_alloc(TS1_ALLOC_SIZE, "DAHDI TS1");
+ lapd_mph_type prim;
+ unsigned int sapi, tei;
+ int ilen, ret;
+ uint8_t *idata;
+
+ if (!msg)
+ return -ENOMEM;
+
+ ret = read(bfd->fd, msg->data, TS1_ALLOC_SIZE - 16);
+ if (ret == -1)
+ handle_dahdi_exception(e1i_ts);
+ else 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);
+
+ idata = lapd_receive(e1i_ts->driver.dahdi.lapd, msg->data, msg->len, &ilen, &prim);
+ if (!idata && prim == 0)
+ return -EIO;
+
+ 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, S_INP_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, S_INP_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.dahdi.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;
+ struct e1inp_line *line = bfd->data;
+ unsigned int ts_nr = bfd->priv_nr;
+ struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
+ int ret;
+
+ ret = write(bfd->fd, data, len + 2);
+ if (ret == -1)
+ handle_dahdi_exception(e1i_ts);
+ else if (ret < 0)
+ LOGP(DMI, LOGL_NOTICE, "%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;
+ }
+
+ DEBUGP(DMI, "TX: %s\n", hexdump(msg->data, msg->len));
+ lapd_transmit(e1i_ts->driver.dahdi.lapd, sign_link->tei,
+ sign_link->sapi, msg->data, msg->len);
+ 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_EXCEPT)
+ handle_dahdi_exception(e1i_ts);
+ 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_EXCEPT)
+ handle_dahdi_exception(e1i_ts);
+ 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);
+ }
+ } else {
+ int one = 1;
+ ioctl(fd, DAHDI_HDLCFCSMODE, &one);
+ /* we cannot reliably check for the ioctl return value here
+ * as this command will fail if the slot _already_ was a
+ * signalling slot before :( */
+ }
+}
+
+static int dahdi_e1_setup(struct e1inp_line *line)
+{
+ 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.dahdi.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 | BSC_FD_EXCEPT;
+ dahdi_set_bufinfo(bfd->fd, 1);
+ e1i_ts->driver.dahdi.lapd = lapd_instance_alloc(1, dahdi_write_msg, bfd);
+ 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_EXCEPT;// | 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)
+{
+ 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 */