[PATCH] isdn4linux: Siemens Gigaset drivers - isdn4linux interface

And: Tilman Schmidt <tilman@imap.cc>

This patch adds the isdn4linux subsystem interface to the gigaset module.  The
isdn4linux subsystem interface handles requests from and notifications to the
isdn4linux subsystem.

Signed-off-by: Hansjoerg Lipp <hjlipp@web.de>
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Cc: Karsten Keil <kkeil@suse.de>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 567 insertions, 0 deletions

diff --git a/drivers/isdn/gigaset/i4l.c b/drivers/isdn/gigaset/i4l.c
new file mode 100644
index 000000000000..731a675f21b0
--- /dev/null
+++ b/drivers/isdn/gigaset/i4l.c
@@ -0,0 +1,567 @@
+/*
+ * Stuff used by all variants of the driver
+ *
+ * Copyright (c) 2001 by Stefan Eilers (Eilers.Stefan@epost.de),
+ *                       Hansjoerg Lipp (hjlipp@web.de),
+ *                       Tilman Schmidt (tilman@imap.cc).
+ *
+ * =====================================================================
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License as
+ *      published by the Free Software Foundation; either version 2 of
+ *      the License, or (at your option) any later version.
+ * =====================================================================
+ * ToDo: ...
+ * =====================================================================
+ * Version: $Id: i4l.c,v 1.3.2.9 2006/02/04 18:28:16 hjlipp Exp $
+ * =====================================================================
+ */
+
+#include "gigaset.h"
+
+/* == Handling of I4L IO ============================================================================*/
+
+/* writebuf_from_LL
+ * called by LL to transmit data on an open channel
+ * inserts the buffer data into the send queue and starts the transmission
+ * Note that this operation must not sleep!
+ * When the buffer is processed completely, gigaset_skb_sent() should be called.
+ * parameters:
+ *      driverID        driver ID as assigned by LL
+ *      channel         channel number
+ *      ack             if != 0 LL wants to be notified on completion via statcallb(ISDN_STAT_BSENT)
+ *      skb             skb containing data to send
+ * return value:
+ *      number of accepted bytes
+ *      0 if temporarily unable to accept data (out of buffer space)
+ *      <0 on error (eg. -EINVAL)
+ */
+static int writebuf_from_LL(int driverID, int channel, int ack, struct sk_buff *skb)
+{
+        struct cardstate *cs;
+        struct bc_state *bcs;
+        unsigned len;
+        unsigned skblen;
+
+        if (!(cs = gigaset_get_cs_by_id(driverID))) {
+                err("%s: invalid driver ID (%d)", __func__, driverID);
+                return -ENODEV;
+        }
+        if (channel < 0 || channel >= cs->channels) {
+                err("%s: invalid channel ID (%d)", __func__, channel);
+                return -ENODEV;
+        }
+        bcs = &cs->bcs[channel];
+        len = skb->len;
+
+        dbg(DEBUG_LLDATA,
+            "Receiving data from LL (id: %d, channel: %d, ack: %d, size: %d)",
+            driverID, channel, ack, len);
+
+        if (!len) {
+                if (ack)
+                        warn("not ACKing empty packet from LL");
+                return 0;
+        }
+        if (len > MAX_BUF_SIZE) {
+                err("%s: packet too large (%d bytes)", __func__, channel);
+                return -EINVAL;
+        }
+
+        if (!atomic_read(&cs->connected))
+                return -ENODEV;
+
+        skblen = ack ? len : 0;
+        skb->head[0] = skblen & 0xff;
+        skb->head[1] = skblen >> 8;
+        dbg(DEBUG_MCMD, "skb: len=%u, skblen=%u: %02x %02x", len, skblen,
+             (unsigned) skb->head[0], (unsigned) skb->head[1]);
+
+        /* pass to device-specific module */
+        return cs->ops->send_skb(bcs, skb);
+}
+
+void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb)
+{
+        unsigned len;
+        isdn_ctrl response;
+
+        ++bcs->trans_up;
+
+        if (skb->len)
+                warn("%s: skb->len==%d", __func__, skb->len);
+
+        len = (unsigned char) skb->head[0] |
+              (unsigned) (unsigned char) skb->head[1] << 8;
+        if (len) {
+                dbg(DEBUG_MCMD,
+                    "Acknowledge sending to LL (id: %d, channel: %d size: %u)",
+                    bcs->cs->myid, bcs->channel, len);
+
+                response.driver = bcs->cs->myid;
+                response.command = ISDN_STAT_BSENT;
+                response.arg = bcs->channel;
+                response.parm.length = len;
+                bcs->cs->iif.statcallb(&response);
+        }
+}
+EXPORT_SYMBOL_GPL(gigaset_skb_sent);
+
+/* This function will be called by LL to send commands
+ * NOTE: LL ignores the returned value, for commands other than ISDN_CMD_IOCTL,
+ * so don't put too much effort into it.
+ */
+static int command_from_LL(isdn_ctrl *cntrl)
+{
+        struct cardstate *cs = gigaset_get_cs_by_id(cntrl->driver);
+        //isdn_ctrl response;
+        //unsigned long flags;
+        struct bc_state *bcs;
+        int retval = 0;
+        struct setup_parm *sp;
+
+        //dbg(DEBUG_ANY, "Gigaset_HW: Receiving command");
+        gigaset_debugdrivers();
+
+        /* Terminate this call if no device is present. Bt if the command is "ISDN_CMD_LOCK" or
+         * "ISDN_CMD_UNLOCK" then execute it due to the fact that they are device independent !
+         */
+        //FIXME "remove test for &connected"
+        if ((!cs || !atomic_read(&cs->connected))) {
+                warn("LL tried to access unknown device with nr. %d",
+                     cntrl->driver);
+                return -ENODEV;
+        }
+
+        switch (cntrl->command) {
+        case ISDN_CMD_IOCTL:
+
+                dbg(DEBUG_ANY, "ISDN_CMD_IOCTL (driver:%d,arg: %ld)",
+                    cntrl->driver, cntrl->arg);
+
+                warn("ISDN_CMD_IOCTL is not supported.");
+                return -EINVAL;
+
+        case ISDN_CMD_DIAL:
+                dbg(DEBUG_ANY, "ISDN_CMD_DIAL (driver: %d, channel: %ld, "
+                    "phone: %s,ownmsn: %s, si1: %d, si2: %d)",
+                    cntrl->driver, cntrl->arg,
+                    cntrl->parm.setup.phone, cntrl->parm.setup.eazmsn,
+                    cntrl->parm.setup.si1, cntrl->parm.setup.si2);
+
+                if (cntrl->arg >= cs->channels) {
+                        err("invalid channel (%d)", (int) cntrl->arg);
+                        return -EINVAL;
+                }
+
+                bcs = cs->bcs + cntrl->arg;
+
+                if (!gigaset_get_channel(bcs)) {
+                        err("channel not free");
+                        return -EBUSY;
+                }
+
+                sp = kmalloc(sizeof *sp, GFP_ATOMIC);
+                if (!sp) {
+                        gigaset_free_channel(bcs);
+                        err("ISDN_CMD_DIAL: out of memory");
+                        return -ENOMEM;
+                }
+                *sp = cntrl->parm.setup;
+
+                if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, sp,
+                                       atomic_read(&bcs->at_state.seq_index),
+                                       NULL)) {
+                        //FIXME what should we do?
+                        kfree(sp);
+                        gigaset_free_channel(bcs);
+                        return -ENOMEM;
+                }
+
+                dbg(DEBUG_CMD, "scheduling DIAL");
+                gigaset_schedule_event(cs);
+                break;
+        case ISDN_CMD_ACCEPTD: //FIXME
+                dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTD");
+
+                if (cntrl->arg >= cs->channels) {
+                        err("invalid channel (%d)", (int) cntrl->arg);
+                        return -EINVAL;
+                }
+
+                if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg].at_state,
+                                       EV_ACCEPT, NULL, 0, NULL)) {
+                        //FIXME what should we do?