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mISDN: Implement MISDN_CTRL_FILL_EMPTY for more drivers

Browse source 
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>
This commit is contained in:
Karsten Keil 2012-05-15 23:51:07 +00:00 • committed by David S. Miller
commit 6d1ee48fd0
11 changed files with 243 additions and 161 deletions
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4
include/linux/mISDNhw.h
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@ -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 */