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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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78
drivers/isdn/hardware/mISDN/netjet.c
View File

@@ -533,22 +533,31 @@ static void
fill_dma(struct tiger_ch *bc)
{
struct tiger_hw *card = bc->bch.hw;
int count, i;
u32 m, v;
int count, i, fillempty = 0;
u32 m, v, n = 0;
u8 *p;
if (bc->free == 0)
return;
count = bc->bch.tx_skb->len - bc->bch.tx_idx;
if (count <= 0)
return;
pr_debug("%s: %s B%1d %d/%d/%d/%d state %x idx %d/%d\n", card->name,
__func__, bc->bch.nr, count, bc->free, bc->bch.tx_idx,
bc->bch.tx_skb->len, bc->txstate, bc->idx, card->send.idx);
if (!bc->bch.tx_skb) {
if (!test_bit(FLG_TX_EMPTY, &bc->bch.Flags))
return;
fillempty = 1;
count = card->send.size >> 1;
p = bc->bch.fill;
} else {
count = bc->bch.tx_skb->len - bc->bch.tx_idx;
if (count <= 0)
return;
pr_debug("%s: %s B%1d %d/%d/%d/%d state %x idx %d/%d\n",
card->name, __func__, bc->bch.nr, count, bc->free,
bc->bch.tx_idx, bc->bch.tx_skb->len, bc->txstate,
bc->idx, card->send.idx);
p = bc->bch.tx_skb->data + bc->bch.tx_idx;
}
if (bc->txstate & (TX_IDLE | TX_INIT | TX_UNDERRUN))
resync(bc, card);
p = bc->bch.tx_skb->data + bc->bch.tx_idx;
if (test_bit(FLG_HDLC, &bc->bch.Flags)) {
if (test_bit(FLG_HDLC, &bc->bch.Flags) && !fillempty) {
count = isdnhdlc_encode(&bc->hsend, p, count, &i,
bc->hsbuf, bc->free);
pr_debug("%s: B%1d hdlc encoded %d in %d\n", card->name,
@@ -559,17 +568,33 @@ fill_dma(struct tiger_ch *bc)
} else {
if (count > bc->free)
count = bc->free;
bc->bch.tx_idx += count;
if (!fillempty)
bc->bch.tx_idx += count;
bc->free -= count;
}
m = (bc->bch.nr & 1) ? 0xffffff00 : 0xffff00ff;
for (i = 0; i < count; i++) {
if (bc->idx >= card->send.size)
bc->idx = 0;
v = card->send.start[bc->idx];
v &= m;
v |= (bc->bch.nr & 1) ? (u32)(p[i]) : ((u32)(p[i])) << 8;
card->send.start[bc->idx++] = v;
if (fillempty) {
n = p[0];
if (!(bc->bch.nr & 1))
n <<= 8;
for (i = 0; i < count; i++) {
if (bc->idx >= card->send.size)
bc->idx = 0;
v = card->send.start[bc->idx];
v &= m;
v |= n;
card->send.start[bc->idx++] = v;
}
} else {
for (i = 0; i < count; i++) {
if (bc->idx >= card->send.size)
bc->idx = 0;
v = card->send.start[bc->idx];
v &= m;
n = p[i];
v |= (bc->bch.nr & 1) ? n : n << 8;
card->send.start[bc->idx++] = v;
}
}
if (debug & DEBUG_HW_BFIFO) {
snprintf(card->log, LOG_SIZE, "B%1d-send %s %d ",
@@ -584,17 +609,26 @@ fill_dma(struct tiger_ch *bc)
static int
bc_next_frame(struct tiger_ch *bc)
{
int ret = 1;
if (bc->bch.tx_skb && bc->bch.tx_idx < bc->bch.tx_skb->len) {
fill_dma(bc);
} else {
if (bc->bch.tx_skb)
dev_kfree_skb(bc->bch.tx_skb);
if (get_next_bframe(&bc->bch))
if (get_next_bframe(&bc->bch)) {
fill_dma(bc);
else
return 0;
test_and_clear_bit(FLG_TX_EMPTY, &bc->bch.Flags);
} else if (test_bit(FLG_TX_EMPTY, &bc->bch.Flags)) {
fill_dma(bc);
} else if (test_bit(FLG_FILLEMPTY, &bc->bch.Flags)) {
test_and_set_bit(FLG_TX_EMPTY, &bc->bch.Flags);
ret = 0;
} else {
ret = 0;
}
}
return 1;
return ret;
}
static void