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path: root/drivers/isdn/hysdn/hysdn_sched.c
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Diffstat (limited to 'drivers/isdn/hysdn/hysdn_sched.c')
-rw-r--r--drivers/isdn/hysdn/hysdn_sched.c197
1 files changed, 197 insertions, 0 deletions
diff --git a/drivers/isdn/hysdn/hysdn_sched.c b/drivers/isdn/hysdn/hysdn_sched.c
new file mode 100644
index 000000000..31d7c1415
--- /dev/null
+++ b/drivers/isdn/hysdn/hysdn_sched.c
@@ -0,0 +1,197 @@
+/* $Id: hysdn_sched.c,v 1.5.6.4 2001/11/06 21:58:19 kai Exp $
+ *
+ * Linux driver for HYSDN cards
+ * scheduler routines for handling exchange card <-> pc.
+ *
+ * Author Werner Cornelius (werner@titro.de) for Hypercope GmbH
+ * Copyright 1999 by Werner Cornelius (werner@titro.de)
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ */
+
+#include <linux/signal.h>
+#include <linux/kernel.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <asm/io.h>
+
+#include "hysdn_defs.h"
+
+/*****************************************************************************/
+/* hysdn_sched_rx is called from the cards handler to announce new data is */
+/* available from the card. The routine has to handle the data and return */
+/* with a nonzero code if the data could be worked (or even thrown away), if */
+/* no room to buffer the data is available a zero return tells the card */
+/* to keep the data until later. */
+/*****************************************************************************/
+int
+hysdn_sched_rx(hysdn_card *card, unsigned char *buf, unsigned short len,
+ unsigned short chan)
+{
+
+ switch (chan) {
+ case CHAN_NDIS_DATA:
+ if (hynet_enable & (1 << card->myid)) {
+ /* give packet to network handler */
+ hysdn_rx_netpkt(card, buf, len);
+ }
+ break;
+
+ case CHAN_ERRLOG:
+ hysdn_card_errlog(card, (tErrLogEntry *) buf, len);
+ if (card->err_log_state == ERRLOG_STATE_ON)
+ card->err_log_state = ERRLOG_STATE_START; /* start new fetch */
+ break;
+#ifdef CONFIG_HYSDN_CAPI
+ case CHAN_CAPI:
+/* give packet to CAPI handler */
+ if (hycapi_enable & (1 << card->myid)) {
+ hycapi_rx_capipkt(card, buf, len);
+ }
+ break;
+#endif /* CONFIG_HYSDN_CAPI */
+ default:
+ printk(KERN_INFO "irq message channel %d len %d unhandled \n", chan, len);
+ break;
+
+ } /* switch rx channel */
+
+ return (1); /* always handled */
+} /* hysdn_sched_rx */
+
+/*****************************************************************************/
+/* hysdn_sched_tx is called from the cards handler to announce that there is */
+/* room in the tx-buffer to the card and data may be sent if needed. */
+/* If the routine wants to send data it must fill buf, len and chan with the */
+/* appropriate data and return a nonzero value. With a zero return no new */
+/* data to send is assumed. maxlen specifies the buffer size available for */
+/* sending. */
+/*****************************************************************************/
+int
+hysdn_sched_tx(hysdn_card *card, unsigned char *buf,
+ unsigned short volatile *len, unsigned short volatile *chan,
+ unsigned short maxlen)
+{
+ struct sk_buff *skb;
+
+ if (card->net_tx_busy) {
+ card->net_tx_busy = 0; /* reset flag */
+ hysdn_tx_netack(card); /* acknowledge packet send */
+ } /* a network packet has completely been transferred */
+ /* first of all async requests are handled */
+ if (card->async_busy) {
+ if (card->async_len <= maxlen) {
+ memcpy(buf, card->async_data, card->async_len);
+ *len = card->async_len;
+ *chan = card->async_channel;
+ card->async_busy = 0; /* reset request */
+ return (1);
+ }
+ card->async_busy = 0; /* in case of length error */
+ } /* async request */
+ if ((card->err_log_state == ERRLOG_STATE_START) &&
+ (maxlen >= ERRLOG_CMD_REQ_SIZE)) {
+ strcpy(buf, ERRLOG_CMD_REQ); /* copy the command */
+ *len = ERRLOG_CMD_REQ_SIZE; /* buffer length */
+ *chan = CHAN_ERRLOG; /* and channel */
+ card->err_log_state = ERRLOG_STATE_ON; /* new state is on */
+ return (1); /* tell that data should be send */
+ } /* error log start and able to send */
+ if ((card->err_log_state == ERRLOG_STATE_STOP) &&
+ (maxlen >= ERRLOG_CMD_STOP_SIZE)) {
+ strcpy(buf, ERRLOG_CMD_STOP); /* copy the command */
+ *len = ERRLOG_CMD_STOP_SIZE; /* buffer length */
+ *chan = CHAN_ERRLOG; /* and channel */
+ card->err_log_state = ERRLOG_STATE_OFF; /* new state is off */
+ return (1); /* tell that data should be send */
+ } /* error log start and able to send */
+ /* now handle network interface packets */
+ if ((hynet_enable & (1 << card->myid)) &&
+ (skb = hysdn_tx_netget(card)) != NULL)
+ {
+ if (skb->len <= maxlen) {
+ /* copy the packet to the buffer */
+ skb_copy_from_linear_data(skb, buf, skb->len);
+ *len = skb->len;
+ *chan = CHAN_NDIS_DATA;
+ card->net_tx_busy = 1; /* we are busy sending network data */
+ return (1); /* go and send the data */
+ } else
+ hysdn_tx_netack(card); /* aknowledge packet -> throw away */
+ } /* send a network packet if available */
+#ifdef CONFIG_HYSDN_CAPI
+ if (((hycapi_enable & (1 << card->myid))) &&
+ ((skb = hycapi_tx_capiget(card)) != NULL))
+ {
+ if (skb->len <= maxlen) {
+ skb_copy_from_linear_data(skb, buf, skb->len);
+ *len = skb->len;
+ *chan = CHAN_CAPI;
+ hycapi_tx_capiack(card);
+ return (1); /* go and send the data */
+ }
+ }
+#endif /* CONFIG_HYSDN_CAPI */
+ return (0); /* nothing to send */
+} /* hysdn_sched_tx */
+
+
+/*****************************************************************************/
+/* send one config line to the card and return 0 if successful, otherwise a */
+/* negative error code. */
+/* The function works with timeouts perhaps not giving the greatest speed */
+/* sending the line, but this should be meaningless because only some lines */
+/* are to be sent and this happens very seldom. */
+/*****************************************************************************/
+int
+hysdn_tx_cfgline(hysdn_card *card, unsigned char *line, unsigned short chan)
+{
+ int cnt = 50; /* timeout intervalls */
+ unsigned long flags;
+
+ if (card->debug_flags & LOG_SCHED_ASYN)
+ hysdn_addlog(card, "async tx-cfg chan=%d len=%d", chan, strlen(line) + 1);
+
+ while (card->async_busy) {
+
+ if (card->debug_flags & LOG_SCHED_ASYN)
+ hysdn_addlog(card, "async tx-cfg delayed");
+
+ msleep_interruptible(20); /* Timeout 20ms */
+ if (!--cnt)
+ return (-ERR_ASYNC_TIME); /* timed out */
+ } /* wait for buffer to become free */
+
+ spin_lock_irqsave(&card->hysdn_lock, flags);
+ strcpy(card->async_data, line);
+ card->async_len = strlen(line) + 1;
+ card->async_channel = chan;
+ card->async_busy = 1; /* request transfer */
+
+ /* now queue the task */
+ schedule_work(&card->irq_queue);
+ spin_unlock_irqrestore(&card->hysdn_lock, flags);
+
+ if (card->debug_flags & LOG_SCHED_ASYN)
+ hysdn_addlog(card, "async tx-cfg data queued");
+
+ cnt++; /* short delay */
+
+ while (card->async_busy) {
+
+ if (card->debug_flags & LOG_SCHED_ASYN)
+ hysdn_addlog(card, "async tx-cfg waiting for tx-ready");
+
+ msleep_interruptible(20); /* Timeout 20ms */
+ if (!--cnt)
+ return (-ERR_ASYNC_TIME); /* timed out */
+ } /* wait for buffer to become free again */
+
+ if (card->debug_flags & LOG_SCHED_ASYN)
+ hysdn_addlog(card, "async tx-cfg data send");
+
+ return (0); /* line send correctly */
+} /* hysdn_tx_cfgline */
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