chan_ss7 HWDTMF patch

diff -u -r chan_ss7-1.1/l4isup.c chan_ss7-1.1-hwdtmf/l4isup.c
--- chan_ss7-1.1/l4isup.c	2008-12-05 13:50:47.000000000 +0100
+++ chan_ss7-1.1-hwdtmf/l4isup.c	2009-05-21 23:34:59.000000000 +0200
@@ -58,6 +58,12 @@
 #include "asterisk/alaw.h"
 #include "asterisk/ulaw.h"
 
+#ifndef DAHDI_TONEDETECT
+/* Work around older code with no tone detect */
+#define DAHDI_EVENT_DTMFDOWN 0
+#define DAHDI_EVENT_DTMFUP 0
+#endif
+
 #ifdef DAHDI
 #include <dahdi/user.h>
 #else
@@ -69,6 +75,12 @@
 #define DAHDI_LAW_MULAW ZT_LAW_MULAW
 #define DAHDI_SETGAINS ZT_SETGAINS
 #define dahdi_gains zt_gains
+#define DAHDI_TONEDETECT ZT_TONEDETECT
+#define DAHDI_TONEDETECT_ON ZT_TONEDETECT_ON
+#define DAHDI_TONEDETECT_MUTE ZT_TONEDETECT_MUTE
+#define DAHDI_EVENT_DTMFDOWN ZT_EVENT_DTMFDOWN 
+#define DAHDI_EVENT_DTMFDUP ZT_EVENT_DTMFUP 
+
 #endif
 
 #include "astversion.h"
@@ -169,6 +181,8 @@
   int law;
   char context[AST_MAX_CONTEXT];
   char language[MAX_LANGUAGE];
+  unsigned int hardwaredtmf:1;
+
 };
 
 /*   Locking order (deadlock avoidance): global lock, chan->lock, pvt->lock
@@ -2164,6 +2178,22 @@
 static void ss7_handle_event(struct ss7_chan *pvt, int event) {
   int res, doing_dtmf;
 
+       if(event & DAHDI_EVENT_DTMFDOWN ) {
+			pvt->frame.frametype = AST_FRAME_DTMF_BEGIN;
+			pvt->frame.sub & 0xff;
+			return ;
+       
+       }
+       
+       if(event &  DAHDI_EVENT_DTMFUP ) {
+		pvt->frame.frametype = AST_FRAME_DTMF_END;
+		pvt->frame.sub & 0xff;
+		return;
+		
+       }
+
+
+
   switch(event) {
   case DAHDI_EVENT_DIALCOMPLETE:
     /* Chech if still doing DTMF sending. If not, set flag to start
@@ -2305,7 +2335,13 @@
 #endif
   pvt->frame.datalen = sofar;
   pvt->frame.samples = sofar;
-  processed_frame = ast_dsp_process(chan, pvt->dsp, &pvt->frame);
+
+   if(pvt->dsp){
+	  	processed_frame = ast_dsp_process(chan, pvt->dsp, &pvt->frame);
+   } else {
+		/*Incase of HWDTF */
+		processed_frame = &pvt->frame;
+	}
 
   ast_mutex_unlock(&pvt->lock);
 
@@ -4463,6 +4499,7 @@
   int cic = link->first_cic + channel;
   char* lang = link->linkset->language;
   char* ctxt = link->linkset->context;
+  int features,x;
   struct ss7_chan *pvt;
 
   pvt = malloc(sizeof(*pvt));
@@ -4473,6 +4510,7 @@
   init_pvt(pvt, cic);
   pvt->link = link;
   pvt->equipped = 1;
+  features=0;
   if(ctxt != NULL) {
     ast_copy_string(pvt->context, ctxt, sizeof(pvt->context));
   }
@@ -4486,14 +4524,28 @@
   pvt->zaptel_fd = openchannel(link, channel);
   if (pvt->zaptel_fd < 0)
     return pvt->zaptel_fd < 0;
-  pvt->dsp = ast_dsp_new();
-  if(pvt->dsp == NULL) {
-    ast_log(LOG_WARNING, "Failed to allocate DSP for CIC=%d.\n", pvt->cic);
-    return -1;
-  }
-  ast_dsp_set_features(pvt->dsp, DSP_FEATURE_DTMF_DETECT);
-  ast_dsp_digitmode(pvt->dsp, DSP_DIGITMODE_DTMF | (link->relaxdtmf ? DSP_DIGITMODE_RELAXDTMF : 0));
+#ifdef DAHDI_TONEDETECT
+	x = DAHDI_TONEDETECT_ON | DAHDI_TONEDETECT_MUTE;
+	if (ioctl(pvt->zaptel_fd, DAHDI_TONEDETECT, &x)) {
+#endif		
+		pvt->hardwaredtmf = 0;
+		features |= DSP_FEATURE_DTMF_DETECT;
+#ifdef DAHDI_TONEDETECT
+	} else if (0) {
+		pvt->hardwaredtmf = 1;
+		features |= DSP_FEATURE_DTMF_DETECT;
+	}
+#endif
 
+  if(features){
+	pvt->dsp = ast_dsp_new();
+	if(pvt->dsp == NULL) {
+		ast_log(LOG_WARNING, "Failed to allocate DSP for CIC=%d.\n", pvt->cic);
+		return -1;
+	}
+	ast_dsp_set_features(pvt->dsp, DSP_FEATURE_DTMF_DETECT);
+	ast_dsp_digitmode(pvt->dsp, DSP_DIGITMODE_DTMF | (link->relaxdtmf ? DSP_DIGITMODE_RELAXDTMF : 0));
+  }
   /* Set gain - Channel must be in audiomode when setting gain */
   set_audiomode(pvt->zaptel_fd);
   set_gain(pvt, link->rxgain, link->txgain);