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    Subject[PATCH 4/9] isdn4linux: Siemens Gigaset drivers - isdn4linux interface
    From: Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>

    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>
    ---

    drivers/isdn/gigaset/i4l.c | 567 +++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 567 insertions(+)

    --- linux-2.6.16-rc2/drivers/isdn/gigaset/i4l.c 1970-01-01 01:00:00.000000000 +0100
    +++ linux-2.6.16-rc2-gig/drivers/isdn/gigaset/i4l.c 2006-02-11 15:20:26.000000000 +0100
    @@ -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;
    +}
    -
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