[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?
+                        return -ENOMEM;
+                }
+
+                dbg(DEBUG_CMD, "scheduling ACCEPT");
+                gigaset_schedule_event(cs);
+
+                break;
+        case ISDN_CMD_ACCEPTB:
+                dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTB");
+                break;
+        case ISDN_CMD_HANGUP:
+                dbg(DEBUG_ANY,
+                    "ISDN_CMD_HANGUP (channel: %d)", (int) cntrl->arg);
+
+                if (cntrl->arg >= cs->channels) {
+                        err("ISDN_CMD_HANGUP: invalid channel (%u)",
+                            (unsigned) cntrl->arg);
+                        return -EINVAL;
+                }
+
+                if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg].at_state,
+                                       EV_HUP, NULL, 0, NULL)) {
+                        //FIXME what should we do?
+                        return -ENOMEM;
+                }
+
+                dbg(DEBUG_CMD, "scheduling HUP");
+                gigaset_schedule_event(cs);
+
+                break;
+        case ISDN_CMD_CLREAZ:               /* Do not signal incoming signals */ //FIXME
+                dbg(DEBUG_ANY, "ISDN_CMD_CLREAZ");
+                break;
+        case ISDN_CMD_SETEAZ:               /* Signal incoming calls for given MSN */ //FIXME
+                dbg(DEBUG_ANY,
+                    "ISDN_CMD_SETEAZ (id:%d, channel: %ld, number: %s)",
+                    cntrl->driver, cntrl->arg, cntrl->parm.num);
+                break;
+        case ISDN_CMD_SETL2:                /* Set L2 to given protocol */
+                dbg(DEBUG_ANY, "ISDN_CMD_SETL2 (Channel: %ld, Proto: %lx)",
+                     cntrl->arg & 0xff, (cntrl->arg >> 8));
+
+                if ((cntrl->arg & 0xff) >= cs->channels) {
+                        err("invalid channel (%u)",
+                            (unsigned) cntrl->arg & 0xff);
+                        return -EINVAL;
+                }
+
+                if (!gigaset_add_event(cs, &cs->bcs[cntrl->arg & 0xff].at_state,
+                                       EV_PROTO_L2, NULL, cntrl->arg >> 8,
+                                       NULL)) {
+                        //FIXME what should we do?
+                        return -ENOMEM;
+                }
+
+                dbg(DEBUG_CMD, "scheduling PROTO_L2");
+                gigaset_schedule_event(cs);
+                break;
+        case ISDN_CMD_SETL3:              /* Set L3 to given protocol */
+                dbg(DEBUG_ANY, "ISDN_CMD_SETL3 (Channel: %ld, Proto: %lx)",
+                     cntrl->arg & 0xff, (cntrl->arg >> 8));
+
+                if ((cntrl->arg & 0xff) >= cs->channels) {
+                        err("invalid channel (%u)",
+                            (unsigned) cntrl->arg & 0xff);
+                        return -EINVAL;
+                }
+
+                if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) {
+                        err("invalid protocol %lu", cntrl->arg >> 8);
+                        return -EINVAL;
+                }
+
+                break;
+        case ISDN_CMD_PROCEED:
+                dbg(DEBUG_ANY, "ISDN_CMD_PROCEED"); //FIXME
+                break;
+        case ISDN_CMD_ALERT:
+                dbg(DEBUG_ANY, "ISDN_CMD_ALERT"); //FIXME
+                if (cntrl->arg >= cs->channels) {
+                        err("invalid channel (%d)", (int) cntrl->arg);
+                        return -EINVAL;
+                }
+                //bcs = cs->bcs + cntrl->arg;
+                //bcs->proto2 = -1;
+                // FIXME
+                break;
+        case ISDN_CMD_REDIR:
+                dbg(DEBUG_ANY, "ISDN_CMD_REDIR"); //FIXME
+                break;
+        case ISDN_CMD_PROT_IO:
+                dbg(DEBUG_ANY, "ISDN_CMD_PROT_IO");
+                break;
+        case ISDN_CMD_FAXCMD:
+                dbg(DEBUG_ANY, "ISDN_CMD_FAXCMD");
+                break;
+        case ISDN_CMD_GETL2:
+                dbg(DEBUG_ANY, "ISDN_CMD_GETL2");
+                break;
+        case ISDN_CMD_GETL3:
+                dbg(DEBUG_ANY, "ISDN_CMD_GETL3");
+                break;
+        case ISDN_CMD_GETEAZ:
+                dbg(DEBUG_ANY, "ISDN_CMD_GETEAZ");
+                break;
+        case ISDN_CMD_SETSIL:
+                dbg(DEBUG_ANY, "ISDN_CMD_SETSIL");
+                break;
+        case ISDN_CMD_GETSIL:
+                dbg(DEBUG_ANY, "ISDN_CMD_GETSIL");
+                break;
+        default:
+                err("unknown command %d from LL",
+                     cntrl->command);
+                return -EINVAL;
+        }
+
+        return retval;
+}
+
+void gigaset_i4l_cmd(struct cardstate *cs, int cmd)
+{
+        isdn_ctrl command;
+
+        command.driver = cs->myid;
+        command.command = cmd;
+        command.arg = 0;
+        cs->iif.statcallb(&command);
+}
+
+void gigaset_i4l_channel_cmd(struct bc_state *bcs, int cmd)
+{
+        isdn_ctrl command;
+
+        command.driver = bcs->cs->myid;
+        command.command = cmd;
+        command.arg = bcs->channel;
+        bcs->cs->iif.statcallb(&command);
+}
+
+int gigaset_isdn_setup_dial(struct at_state_t *at_state, void *data)
+{
+        struct bc_state *bcs = at_state->bcs;
+        unsigned proto;
+        const char *bc;
+        size_t length[AT_NUM];
+        size_t l;
+        int i;
+        struct setup_parm *sp = data;
+
+        switch (bcs->proto2) {
+        case ISDN_PROTO_L2_HDLC:
+                proto = 1; /* 0: Bitsynchron, 1: HDLC, 2: voice */
+                break;
+        case ISDN_PROTO_L2_TRANS:
+                proto = 2; /* 0: Bitsynchron, 1: HDLC, 2: voice */
+                break;
+        default:
+                err("invalid protocol: %u", bcs->proto2);
+                return -EINVAL;
+        }
+
+        switch (sp->si1) {
+        case 1:         /* audio */
+                bc = "9090A3";  /* 3.1 kHz audio, A-law */
+                break;
+        case 7:         /* data */
+        default:        /* hope the app knows what it is doing */
+                bc = "8890";    /* unrestricted digital information */
+        }
+        //FIXME add missing si1 values from 1TR6, inspect si2, set HLC/LLC
+
+        length[AT_DIAL ] = 1 + strlen(sp->phone) + 1 + 1;
+        l = strlen(sp->eazmsn);
+        length[AT_MSN  ] = l ? 6 + l + 1 + 1 : 0;
+        length[AT_BC   ] = 5 + strlen(bc) + 1 + 1;
+        length[AT_PROTO] = 6 + 1 + 1 + 1; /* proto: 1 character */
+        length[AT_ISO  ] = 6 + 1 + 1 + 1; /* channel: 1 character */
+        length[AT_TYPE ] = 6 + 1 + 1 + 1; /* call type: 1 character */
+        length[AT_HLC  ] = 0;
+
+        for (i = 0; i < AT_NUM; ++i) {
+                kfree(bcs->commands[i]);
+                bcs->commands[i] = NULL;
+                if (length[i] &&
+                    !(bcs->commands[i] = kmalloc(length[i], GFP_ATOMIC))) {
+                        err("out of memory");
+                        return -ENOMEM;
+                }
+        }
+
+        /* type = 1: extern, 0: intern, 2: recall, 3: door, 4: centrex */
+        if (sp->phone[0] == '*' && sp->phone[1] == '*') {
+                /* internal call: translate ** prefix to CTP value */
+                snprintf(bcs->commands[AT_DIAL], length[AT_DIAL],
+                         "D%s\r", sp->phone+2);
+                strncpy(bcs->commands[AT_TYPE], "^SCTP=0\r", length[AT_TYPE]);
+        } else {
+                snprintf(bcs->commands[AT_DIAL], length[AT_DIAL],
+                         "D%s\r", sp->phone);
+                strncpy(bcs->commands[AT_TYPE], "^SCTP=1\r", length[AT_TYPE]);
+        }
+
+        if (bcs->commands[AT_MSN])
+                snprintf(bcs->commands[AT_MSN], length[AT_MSN], "^SMSN=%s\r", sp->eazmsn);
+        snprintf(bcs->commands[AT_BC   ], length[AT_BC   ], "^SBC=%s\r", bc);
+        snprintf(bcs->commands[AT_PROTO], length[AT_PROTO], "^SBPR=%u\r", proto);
+        snprintf(bcs->commands[AT_ISO  ], length[AT_ISO  ], "^SISO=%u\r", (unsigned)bcs->channel + 1);
+
+        return 0;
+}
+
+int gigaset_isdn_setup_accept(struct at_state_t *at_state)
+{
+        unsigned proto;
+        size_t length[AT_NUM];
+        int i;
+        struct bc_state *bcs = at_state->bcs;
+
+        switch (bcs->proto2) {
+        case ISDN_PROTO_L2_HDLC:
+                proto = 1; /* 0: Bitsynchron, 1: HDLC, 2: voice */
+                break;
+        case ISDN_PROTO_L2_TRANS:
+                proto = 2; /* 0: Bitsynchron, 1: HDLC, 2: voice */
+                break;
+        default:
+                err("invalid protocol: %u", bcs->proto2);
+                return -EINVAL;
+        }
+
+        length[AT_DIAL ] = 0;
+        length[AT_MSN  ] = 0;
+        length[AT_BC   ] = 0;
+        length[AT_PROTO] = 6 + 1 + 1 + 1; /* proto: 1 character */
+        length[AT_ISO  ] = 6 + 1 + 1 + 1; /* channel: 1 character */
+        length[AT_TYPE ] = 0;
+        length[AT_HLC  ] = 0;
+
+        for (i = 0; i < AT_NUM; ++i) {
+                kfree(bcs->commands[i]);
+                bcs->commands[i] = NULL;
+                if (length[i] &&
+                    !(bcs->commands[i] = kmalloc(length[i], GFP_ATOMIC))) {
+                        err("out of memory");
+                        return -ENOMEM;
+                }
+        }
+
+        snprintf(bcs->commands[AT_PROTO], length[AT_PROTO], "^SBPR=%u\r", proto);
+        snprintf(bcs->commands[AT_ISO  ], length[AT_ISO  ], "^SISO=%u\r", (unsigned) bcs->channel + 1);
+
+        return 0;
+}
+
+int gigaset_isdn_icall(struct at_state_t *at_state)
+{
+        struct cardstate *cs = at_state->cs;
+        struct bc_state *bcs = at_state->bcs;
+        isdn_ctrl response;
+        int retval;
+
+        /* fill ICALL structure */
+        response.parm.setup.si1 = 0;    /* default: unknown */
+        response.parm.setup.si2 = 0;
+        response.parm.setup.screen = 0; //FIXME how to set these?
+        response.parm.setup.plan = 0;
+        if (!at_state->str_var[STR_ZBC]) {
+                /* no BC (internal call): assume speech, A-law */
+                response.parm.setup.si1 = 1;
+        } else if (!strcmp(at_state->str_var[STR_ZBC], "8890")) {
+                /* unrestricted digital information */
+                response.parm.setup.si1 = 7;
+        } else if (!strcmp(at_state->str_var[STR_ZBC], "8090A3")) {
+                /* speech, A-law */
+                response.parm.setup.si1 = 1;
+        } else if (!strcmp(at_state->str_var[STR_ZBC], "9090A3")) {
+                /* 3,1 kHz audio, A-law */
+                response.parm.setup.si1 = 1;
+                response.parm.setup.si2 = 2;
+        } else {
+                warn("RING ignored - unsupported BC %s",
+                     at_state->str_var[STR_ZBC]);
+                return ICALL_IGNORE;
+        }
+        if (at_state->str_var[STR_NMBR]) {
+                strncpy(response.parm.setup.phone, at_state->str_var[STR_NMBR],
+                        sizeof response.parm.setup.phone - 1);
+                response.parm.setup.phone[sizeof response.parm.setup.phone - 1] = 0;
+        } else
+                response.parm.setup.phone[0] = 0;
+        if (at_state->str_var[STR_ZCPN]) {
+                strncpy(response.parm.setup.eazmsn, at_state->str_var[STR_ZCPN],
+                        sizeof response.parm.setup.eazmsn - 1);
+                response.parm.setup.eazmsn[sizeof response.parm.setup.eazmsn - 1] = 0;
+        } else
+                response.parm.setup.eazmsn[0] = 0;
+
+        if (!bcs) {
+                notice("no channel for incoming call");
+                dbg(DEBUG_CMD, "Sending ICALLW");
+                response.command = ISDN_STAT_ICALLW;
+                response.arg = 0; //FIXME
+        } else {
+                dbg(DEBUG_CMD, "Sending ICALL");
+                response.command = ISDN_STAT_ICALL;
+                response.arg = bcs->channel; //FIXME
+        }
+        response.driver = cs->myid;
+        retval = cs->iif.statcallb(&response);
+        dbg(DEBUG_CMD, "Response: %d", retval);
+        switch (retval) {
+        case 0: /* no takers */
+                return ICALL_IGNORE;
+        case 1: /* alerting */
+                bcs->chstate |= CHS_NOTIFY_LL;
+                return ICALL_ACCEPT;
+        case 2: /* reject */
+                return ICALL_REJECT;
+        case 3: /* incomplete */
+                warn("LL requested unsupported feature: Incomplete Number");
+                return ICALL_IGNORE;
+        case 4: /* proceeding */
+                /* Gigaset will send ALERTING anyway.
+                 * There doesn't seem to be a way to avoid this.
+                 */
+                return ICALL_ACCEPT;
+        case 5: /* deflect */
+                warn("LL requested unsupported feature: Call Deflection");
+                return ICALL_IGNORE;
+        default:
+                err("LL error %d on ICALL", retval);
+                return ICALL_IGNORE;
+        }
+}
+
+/* Set Callback function pointer */
+int gigaset_register_to_LL(struct cardstate *cs, const char *isdnid)
+{
+        isdn_if *iif = &cs->iif;
+
+        dbg(DEBUG_ANY, "Register driver capabilities to LL");
+
+        //iif->id[sizeof(iif->id) - 1]=0;
+        //strncpy(iif->id, isdnid, sizeof(iif->id) - 1);
+        if (snprintf(iif->id, sizeof iif->id, "%s_%u", isdnid, cs->minor_index)
+            >= sizeof iif->id)
+                return -ENOMEM; //FIXME EINVAL/...??
+
+        iif->owner = THIS_MODULE;
+        iif->channels = cs->channels;                        /* I am supporting just one channel *//* I was supporting...*/
+        iif->maxbufsize = MAX_BUF_SIZE;
+        iif->features = ISDN_FEATURE_L2_TRANS |   /* Our device is very advanced, therefore */
+                ISDN_FEATURE_L2_HDLC |
+#ifdef GIG_X75
+                ISDN_FEATURE_L2_X75I |
+#endif
+                ISDN_FEATURE_L3_TRANS |
+                ISDN_FEATURE_P_EURO;
+        iif->hl_hdrlen = HW_HDR_LEN;              /* Area for storing ack */
+        iif->command = command_from_LL;
+        iif->writebuf_skb = writebuf_from_LL;
+        iif->writecmd = NULL;                     /* Don't support isdnctrl */
+        iif->readstat = NULL;                     /* Don't support isdnctrl */
+        iif->rcvcallb_skb = NULL;                 /* Will be set by LL */
+        iif->statcallb = NULL;                    /* Will be set by LL */
+
+        if (!register_isdn(iif))
+                return 0;
+
+        cs->myid = iif->channels;                 /* Set my device id */
+        return 1;
+}