dahdi: sysfs: add channel attributes

Signed-off-by: Oron Peled <oron.peled@xorcom.com>

include/dahdi/kernel.h

@@ -1230,6 +1230,12 @@ void dahdi_init_tone_state(struct dahdi_tone_state *ts, struct dahdi_tone *zt);
 /*! \brief Get a given MF tone struct, suitable for dahdi_tone_nextsample. */
 struct dahdi_tone *dahdi_mf_tone(const struct dahdi_chan *chan, char digit, int digitmode);
 
+/*! \brief Convert signalling bits to human readable string */
+const char *sigstr(int sig);
+
+/*! \brief Convert alarm bits to human readable string */
+int fill_alarm_string(char *buf, int count, int alarms);
+
 /* Echo cancel a receive and transmit chunk for a given channel.  This
    should be called by the low-level driver as close to the interface
    as possible.  ECHO CANCELLATION IS NO LONGER AUTOMATICALLY DONE