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/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c
index 2774375..1bd8bc7 100644
--- a/drivers/isdn/hardware/mISDN/hfcpci.c
+++ b/drivers/isdn/hardware/mISDN/hfcpci.c
@@ -565,11 +565,6 @@
if (new_z2 >= (B_FIFO_SIZE + B_SUB_VAL))
new_z2 -= B_FIFO_SIZE; /* buffer wrap */
- if (fcnt_rx > MAX_DATA_SIZE) { /* flush, if oversized */
- *z2r = cpu_to_le16(new_z2); /* new position */
- return;
- }
-
fcnt_tx = le16_to_cpu(*z2t) - le16_to_cpu(*z1t);
if (fcnt_tx <= 0)
fcnt_tx += B_FIFO_SIZE;
@@ -761,9 +756,14 @@
if ((bch->debug & DEBUG_HW_BCHANNEL) && !(bch->debug & DEBUG_HW_BFIFO))
printk(KERN_DEBUG "%s\n", __func__);
- if ((!bch->tx_skb) || bch->tx_skb->len <= 0)
- return;
- count = bch->tx_skb->len - bch->tx_idx;
+ if ((!bch->tx_skb) || bch->tx_skb->len == 0) {
+ if (!test_bit(FLG_FILLEMPTY, &bch->Flags) &&
+ !test_bit(FLG_TRANSPARENT, &bch->Flags))
+ return;
+ count = HFCPCI_FILLEMPTY;
+ } else {
+ count = bch->tx_skb->len - bch->tx_idx;
+ }
if ((bch->nr & 2) && (!hc->hw.bswapped)) {
bz = &((union fifo_area *)(hc->hw.fifos))->b_chans.txbz_b2;
bdata = ((union fifo_area *)(hc->hw.fifos))->b_chans.txdat_b2;
@@ -782,16 +782,10 @@
fcnt = le16_to_cpu(*z2t) - le16_to_cpu(*z1t);
if (fcnt <= 0)
fcnt += B_FIFO_SIZE;
- /* fcnt contains available bytes in fifo */
- fcnt = B_FIFO_SIZE - fcnt;
- /* remaining bytes to send (bytes in fifo) */
-
- /* "fill fifo if empty" feature */
- if (test_bit(FLG_FILLEMPTY, &bch->Flags) && !fcnt) {
- /* printk(KERN_DEBUG "%s: buffer empty, so we have "
- "underrun\n", __func__); */
- /* fill buffer, to prevent future underrun */
- count = HFCPCI_FILLEMPTY;
+ if (test_bit(FLG_FILLEMPTY, &bch->Flags)) {
+ /* fcnt contains available bytes in fifo */
+ if (count > fcnt)
+ count = fcnt;
new_z1 = le16_to_cpu(*z1t) + count;
/* new buffer Position */
if (new_z1 >= (B_FIFO_SIZE + B_SUB_VAL))
@@ -803,17 +797,20 @@
printk(KERN_DEBUG "hfcpci_FFt fillempty "
"fcnt(%d) maxl(%d) nz1(%x) dst(%p)\n",
fcnt, maxlen, new_z1, dst);
- fcnt += count;
if (maxlen > count)
maxlen = count; /* limit size */
- memset(dst, 0x2a, maxlen); /* first copy */
+ memset(dst, bch->fill[0], maxlen); /* first copy */
count -= maxlen; /* remaining bytes */
if (count) {
dst = bdata; /* start of buffer */
- memset(dst, 0x2a, count);
+ memset(dst, bch->fill[0], count);
}
*z1t = cpu_to_le16(new_z1); /* now send data */
+ return;
}
+ /* fcnt contains available bytes in fifo */
+ fcnt = B_FIFO_SIZE - fcnt;
+ /* remaining bytes to send (bytes in fifo) */
next_t_frame:
count = bch->tx_skb->len - bch->tx_idx;
@@ -1531,24 +1528,7 @@
static int
channel_bctrl(struct bchannel *bch, struct mISDN_ctrl_req *cq)
{
- int ret = 0;
-
- switch (cq->op) {
- case MISDN_CTRL_GETOP:
- ret = mISDN_ctrl_bchannel(bch, cq);
- cq->op |= MISDN_CTRL_FILL_EMPTY;
- break;
- case MISDN_CTRL_FILL_EMPTY: /* fill fifo, if empty */
- test_and_set_bit(FLG_FILLEMPTY, &bch->Flags);
- if (debug & DEBUG_HW_OPEN)
- printk(KERN_DEBUG "%s: FILL_EMPTY request (nr=%d "
- "off=%d)\n", __func__, bch->nr, !!cq->p1);
- break;
- default:
- ret = mISDN_ctrl_bchannel(bch, cq);
- break;
- }
- return ret;
+ return mISDN_ctrl_bchannel(bch, cq);
}
static int
hfc_bctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
@@ -1964,7 +1944,6 @@
bch = &hc->bch[rq->adr.channel - 1];
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; /* TODO: E-channel */
if (!try_module_get(THIS_MODULE))