mISDN: Implement MISDN_CTRL_FILL_EMPTY for more drivers

MISDN_CTRL_FILL_EMPTY is a meachanism to send a fixed value (normally silence)
as long no data from upper layers is available. It can be used when recording
voice messages or with unidirectional protocols.

Signed-off-by: Karsten Keil <kkeil@linux-pingi.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/linux/mISDNhw.h b/include/linux/mISDNhw.h
index 226886cf31e7..621184216566 100644
--- a/include/linux/mISDNhw.h
+++ b/include/linux/mISDNhw.h
@@ -72,7 +72,7 @@
 #define FLG_LL_OK               24
 #define FLG_LL_CONN             25
 #define FLG_DTMFSEND            26
-
+#define FLG_TX_EMPTY            27
 /* workq events */
 #define FLG_RECVQUEUE           30
 #define FLG_PHCHANGE            31
@@ -142,6 +142,7 @@ extern int	create_l1(struct dchannel *, dchannel_l1callback *);
 struct layer1;
 extern int      l1_event(struct layer1 *, u_int);
 
+#define MISDN_BCH_FILL_SIZE     4
 
 struct bchannel {
         struct mISDNchannel     ch;
@@ -153,6 +154,7 @@ struct bchannel {
         int                     slot;   /* multiport card channel slot */
         struct timer_list       timer;
         /* receive data */
+        u8                      fill[MISDN_BCH_FILL_SIZE];
         struct sk_buff          *rx_skb;
         unsigned short          maxlen;
         unsigned short          init_maxlen; /* initial value */