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>
diff --git a/drivers/isdn/hardware/mISDN/mISDNisar.c b/drivers/isdn/hardware/mISDN/mISDNisar.c
index e74ad38..901be32 100644
--- a/drivers/isdn/hardware/mISDN/mISDNisar.c
+++ b/drivers/isdn/hardware/mISDN/mISDNisar.c
@@ -585,16 +585,25 @@
u8 msb;
u8 *ptr;
- pr_debug("%s: ch%d tx_skb %p tx_idx %d\n",
- ch->is->name, ch->bch.nr, ch->bch.tx_skb, ch->bch.tx_idx);
- if (!ch->bch.tx_skb)
- return;
- count = ch->bch.tx_skb->len - ch->bch.tx_idx;
- if (count <= 0)
- return;
+ pr_debug("%s: ch%d tx_skb %d tx_idx %d\n", ch->is->name, ch->bch.nr,
+ ch->bch.tx_skb ? ch->bch.tx_skb->len : -1, ch->bch.tx_idx);
if (!(ch->is->bstat &
(ch->dpath == 1 ? BSTAT_RDM1 : BSTAT_RDM2)))
return;
+ if (!ch->bch.tx_skb) {
+ if (!test_bit(FLG_TX_EMPTY, &ch->bch.Flags) ||
+ (ch->bch.state != ISDN_P_B_RAW))
+ return;
+ count = ch->mml;
+ /* use the card buffer */
+ memset(ch->is->buf, ch->bch.fill[0], count);
+ send_mbox(ch->is, SET_DPS(ch->dpath) | ISAR_HIS_SDATA,
+ 0, count, ch->is->buf);
+ return;
+ }
+ count = ch->bch.tx_skb->len - ch->bch.tx_idx;
+ if (count <= 0)
+ return;
if (count > ch->mml) {
msb = 0;
count = ch->mml;
@@ -673,9 +682,9 @@
static void
send_next(struct isar_ch *ch)
{
- pr_debug("%s: %s ch%d tx_skb %p tx_idx %d\n",
- ch->is->name, __func__, ch->bch.nr,
- ch->bch.tx_skb, ch->bch.tx_idx);
+ pr_debug("%s: %s ch%d tx_skb %d tx_idx %d\n", ch->is->name, __func__,
+ ch->bch.nr, ch->bch.tx_skb ? ch->bch.tx_skb->len : -1,
+ ch->bch.tx_idx);
if (ch->bch.state == ISDN_P_B_T30_FAX) {
if (ch->cmd == PCTRL_CMD_FTH) {
if (test_bit(FLG_LASTDATA, &ch->bch.Flags)) {
@@ -693,6 +702,9 @@
dev_kfree_skb(ch->bch.tx_skb);
if (get_next_bframe(&ch->bch)) {
isar_fill_fifo(ch);
+ test_and_clear_bit(FLG_TX_EMPTY, &ch->bch.Flags);
+ } else if (test_bit(FLG_TX_EMPTY, &ch->bch.Flags)) {
+ isar_fill_fifo(ch);
} else {
if (test_and_clear_bit(FLG_DLEETX, &ch->bch.Flags)) {
if (test_and_clear_bit(FLG_LASTDATA,
@@ -707,6 +719,8 @@
} else {
deliver_status(ch, HW_MOD_CONNECT);
}
+ } else if (test_bit(FLG_FILLEMPTY, &ch->bch.Flags)) {
+ test_and_set_bit(FLG_TX_EMPTY, &ch->bch.Flags);
}
}
}
@@ -1638,7 +1652,6 @@
bch = &isar->ch[rq->adr.channel - 1].bch;
if (test_and_set_bit(FLG_OPEN, &bch->Flags))
return -EBUSY; /* b-channel can be only open once */
- test_and_clear_bit(FLG_FILLEMPTY, &bch->Flags);
bch->ch.protocol = rq->protocol;
rq->ch = &bch->ch;
return 0;