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# Translate the D channels to a standard channel data.
# The HFC chipset provides us the D channel as data, but
# Zaptel expects it as a standard channel with 1000 samples
# per second.
Index: dahdi-linux-2.5.0/include/dahdi/kernel.h
===================================================================
--- dahdi-linux-2.5.0.orig/include/dahdi/kernel.h 2011-06-29 18:32:40.000000000 +0300
+++ dahdi-linux-2.5.0/include/dahdi/kernel.h 2011-08-15 14:14:26.000000000 +0300
@@ -413,6 +413,13 @@
int statcount;
int lastnumbufs;
#endif
+#ifdef CONFIG_DAHDI_BRI_DCHANS
+ int bytes2receive;
+ int maxbytes2transmit; /* size of the tx buffer in the card driver */
+ int bytes2transmit;
+ int eofrx;
+ int eoftx;
+#endif
spinlock_t lock;
char name[40];
/* Specified by DAHDI */
@@ -723,6 +730,9 @@
DAHDI_FLAGBIT_TXUNDERRUN = 22, /*!< Transmit underrun condition */
DAHDI_FLAGBIT_RXOVERRUN = 23, /*!< Receive overrun condition */
DAHDI_FLAGBIT_DEVFILE = 25, /*!< Channel has a sysfs dev file */
+#if defined(CONFIG_DAHDI_BRI_DCHANS)
+ DAHDI_FLAGBIT_BRIDCHAN = 26, /*!< hardhdlc-like handling of the D channel */
+#endif
};
#ifdef CONFIG_DAHDI_NET
@@ -789,6 +799,7 @@
#define DAHDI_FLAG_BUFEVENTS DAHDI_FLAG(BUFEVENTS)
#define DAHDI_FLAG_TXUNDERRUN DAHDI_FLAG(TXUNDERRUN)
#define DAHDI_FLAG_RXOVERRUN DAHDI_FLAG(RXOVERRUN)
+#define DAHDI_FLAG_BRIDCHAN DAHDI_FLAG(BRIDCHAN)
struct file;
Index: dahdi-linux-2.5.0/include/dahdi/dahdi_config.h
===================================================================
--- dahdi-linux-2.5.0.orig/include/dahdi/dahdi_config.h 2011-01-05 17:52:03.000000000 +0200
+++ dahdi-linux-2.5.0/include/dahdi/dahdi_config.h 2011-08-15 14:13:01.000000000 +0300
@@ -195,4 +195,10 @@
*/
/* #define CONFIG_DAHDI_MIRROR */
+/*
+ * Uncomment the following for BRI D channels
+ *
+ */
+#define CONFIG_DAHDI_BRI_DCHANS
+
#endif
Index: dahdi-linux-2.5.0/drivers/dahdi/dahdi-base.c
===================================================================
--- dahdi-linux-2.5.0.orig/drivers/dahdi/dahdi-base.c 2011-07-21 19:26:31.000000000 +0300
+++ dahdi-linux-2.5.0/drivers/dahdi/dahdi-base.c 2011-08-15 14:13:01.000000000 +0300
@@ -7224,11 +7224,40 @@
*(txb++) = fasthdlc_tx_run_nocheck(&ms->txhdlc);
}
bytes -= left;
+#ifdef CONFIG_DAHDI_BRI_DCHANS
+ } else if (test_bit(DAHDI_FLAGBIT_BRIDCHAN, &ms->flags)) {
+ /*
+ * Let's get this right, we want to transmit complete frames only.
+ * The card driver will do the dirty HDLC work for us.
+ * txb (transmit buffer) is supposed to be big enough to store one frame
+ * we will make this as big as the D fifo (1KB or 2KB)
+ */
+
+ /* there are 'left' bytes in the user buffer left to transmit */
+ left = ms->writen[ms->outwritebuf] - ms->writeidx[ms->outwritebuf] - 2;
+ if (left > ms->maxbytes2transmit) {
+ memcpy(txb, buf + ms->writeidx[ms->outwritebuf], ms->maxbytes2transmit);
+ ms->writeidx[ms->outwritebuf] += ms->maxbytes2transmit;
+ txb += ms->maxbytes2transmit;
+ ms->bytes2transmit = ms->maxbytes2transmit;
+ ms->eoftx = 0;
+ } else {
+ memcpy(txb, buf + ms->writeidx[ms->outwritebuf], left);
+ ms->writeidx[ms->outwritebuf] += left + 2;
+ txb += left + 2;
+ ms->bytes2transmit = left;
+ ms->eoftx = 1;
+ }
+ bytes = 0;
+#endif
} else {
memcpy(txb, buf + ms->writeidx[ms->outwritebuf], left);
ms->writeidx[ms->outwritebuf]+=left;
txb += left;
bytes -= left;
+#if defined(CONFIG_DAHDI_BRI_DCHANS)
+ ms->bytes2transmit=DAHDI_CHUNKSIZE;
+#endif
}
/* Check buffer status */
if (ms->writeidx[ms->outwritebuf] >= ms->writen[ms->outwritebuf]) {
@@ -7285,6 +7314,17 @@
/* Transmit a flag if this is an HDLC channel */
if (ms->flags & DAHDI_FLAG_HDLC)
fasthdlc_tx_frame_nocheck(&ms->txhdlc);
+#if defined(CONFIG_DAHDI_BRI_DCHANS)
+ if (test_bit(DAHDI_FLAGBIT_BRIDCHAN, &ms->flags)) {
+ // if (ms->bytes2transmit > 0) {
+ // txb += 2;
+ // ms->bytes2transmit -= 2;
+ bytes=0;
+ ms->eoftx = 1;
+// printk(KERN_CRIT "zaptel EOF(%d) bytes2transmit %d\n",ms->eoftx,ms->bytes2transmit);
+ // }
+ }
+#endif
#ifdef CONFIG_DAHDI_NET
if (dahdi_have_netdev(ms))
netif_wake_queue(chan_to_netdev(ms));
@@ -7346,6 +7386,12 @@
}
needtxunderrun += bytes;
bytes = 0;
+#if defined(CONFIG_DAHDI_BRI_DCHANS)
+ } else if (test_bit(DAHDI_FLAGBIT_BRIDCHAN, &ms->flags)) {
+ ms->bytes2transmit = 0;
+ ms->eoftx = 0;
+ bytes = 0;
+#endif
} else {
memset(txb, DAHDI_LIN2X(0, ms), bytes); /* Lastly we use silence on telephony channels */
needtxunderrun += bytes;
@@ -8267,6 +8313,14 @@
int res;
int left, x;
+#if defined(CONFIG_DAHDI_BRI_DCHANS)
+ if (test_bit(DAHDI_FLAGBIT_BRIDCHAN, &ms->flags)) {
+ bytes = ms->bytes2receive;
+ if (bytes < 1) return;
+// printk(KERN_CRIT "bytes2receive %d\n",ms->bytes2receive);
+ }
+#endif
+
while(bytes) {
#if defined(CONFIG_DAHDI_NET) || defined(CONFIG_DAHDI_PPP)
skb = NULL;
@@ -8324,6 +8378,19 @@
}
}
}
+#ifdef CONFIG_DAHDI_BRI_DCHANS
+ } else if (test_bit(DAHDI_FLAGBIT_BRIDCHAN, &ms->flags)) {
+ memcpy(buf + ms->readidx[ms->inreadbuf], rxb, left);
+ rxb += left;
+ ms->readidx[ms->inreadbuf] += left;
+ bytes -= left;
+ if (ms->eofrx == 1) {
+ eof=1;
+ }
+// printk(KERN_CRIT "receiving %d bytes\n",ms->bytes2receive);
+ ms->bytes2receive = 0;
+ ms->eofrx = 0;
+#endif
} else {
/* Not HDLC */
memcpy(buf + ms->readidx[ms->inreadbuf], rxb, left);
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