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mISDN: Implement MISDN_CTRL_FILL_EMPTY for more drivers

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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
parent 034005a011
commit 6d1ee48fd0
11 changed files with 244 additions and 162 deletions
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drivers/isdn/mISDN/hwchannel.c
+11 -1
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@@ -140,6 +140,8 @@ mISDN_clear_bchannel(struct bchannel *ch)
test_and_clear_bit(FLG_TX_BUSY, &ch->Flags);
test_and_clear_bit(FLG_TX_NEXT, &ch->Flags);
test_and_clear_bit(FLG_ACTIVE, &ch->Flags);
test_and_clear_bit(FLG_FILLEMPTY, &ch->Flags);
test_and_clear_bit(FLG_TX_EMPTY, &ch->Flags);
ch->minlen = ch->init_minlen;
ch->next_minlen = ch->init_minlen;
ch->maxlen = ch->init_maxlen;
@@ -165,7 +167,15 @@ mISDN_ctrl_bchannel(struct bchannel *bch, struct mISDN_ctrl_req *cq)
switch (cq->op) {
case MISDN_CTRL_GETOP:
cq->op = MISDN_CTRL_RX_BUFFER;
cq->op = MISDN_CTRL_RX_BUFFER | MISDN_CTRL_FILL_EMPTY;
break;
case MISDN_CTRL_FILL_EMPTY:
if (cq->p1) {
memset(bch->fill, cq->p2 & 0xff, MISDN_BCH_FILL_SIZE);
test_and_set_bit(FLG_FILLEMPTY, &bch->Flags);
} else {
test_and_clear_bit(FLG_FILLEMPTY, &bch->Flags);
}
break;
case MISDN_CTRL_RX_BUFFER:
if (cq->p2 > MISDN_CTRL_RX_SIZE_IGNORE)