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i4l.c

/*
 * Stuff used by all variants of the driver
 *
 * Copyright (c) 2001 by Stefan Eilers,
 *                       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.
 * =====================================================================
 */

#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;

      gig_dbg(DEBUG_LLDATA,
            "Receiving data from LL (id: %d, ch: %d, ack: %d, sz: %d)",
            driverID, channel, ack, len);

      if (!len) {
            if (ack)
                  notice("%s: not ACKing empty packet", __func__);
            return 0;
      }
      if (len > MAX_BUF_SIZE) {
            err("%s: packet too large (%d bytes)", __func__, len);
            return -EINVAL;
      }

      skblen = ack ? len : 0;
      skb->head[0] = skblen & 0xff;
      skb->head[1] = skblen >> 8;
      gig_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)
            dev_warn(bcs->cs->dev, "%s: skb->len==%d\n",
                   __func__, skb->len);

      len = (unsigned char) skb->head[0] |
            (unsigned) (unsigned char) skb->head[1] << 8;
      if (len) {
            gig_dbg(DEBUG_MCMD, "ACKing to LL (id: %d, ch: %d, sz: %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);
      struct bc_state *bcs;
      int retval = 0;
      struct setup_parm *sp;

      gigaset_debugdrivers();

      if (!cs) {
            warn("LL tried to access unknown device with nr. %d",
                 cntrl->driver);
            return -ENODEV;
      }

      switch (cntrl->command) {
      case ISDN_CMD_IOCTL:
            gig_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:
            gig_dbg(DEBUG_ANY,
                  "ISDN_CMD_DIAL (driver: %d, ch: %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("ISDN_CMD_DIAL: invalid channel (%d)",
                      (int) cntrl->arg);
                  return -EINVAL;
            }

            bcs = cs->bcs + cntrl->arg;

            if (!gigaset_get_channel(bcs)) {
                  err("ISDN_CMD_DIAL: 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,
                               bcs->at_state.seq_index, NULL)) {
                  //FIXME what should we do?
                  kfree(sp);
                  gigaset_free_channel(bcs);
                  return -ENOMEM;
            }

            gig_dbg(DEBUG_CMD, "scheduling DIAL");
            gigaset_schedule_event(cs);
            break;
      case ISDN_CMD_ACCEPTD: //FIXME
            gig_dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTD");

            if (cntrl->arg >= cs->channels) {
                  err("ISDN_CMD_ACCEPTD: 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;
            }

            gig_dbg(DEBUG_CMD, "scheduling ACCEPT");
            gigaset_schedule_event(cs);

            break;
      case ISDN_CMD_ACCEPTB:
            gig_dbg(DEBUG_ANY, "ISDN_CMD_ACCEPTB");
            break;
      case ISDN_CMD_HANGUP:
            gig_dbg(DEBUG_ANY, "ISDN_CMD_HANGUP (ch: %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;
            }

            gig_dbg(DEBUG_CMD, "scheduling HUP");
            gigaset_schedule_event(cs);

            break;
      case ISDN_CMD_CLREAZ: /* Do not signal incoming signals */ //FIXME
            gig_dbg(DEBUG_ANY, "ISDN_CMD_CLREAZ");
            break;
      case ISDN_CMD_SETEAZ: /* Signal incoming calls for given MSN */ //FIXME
            gig_dbg(DEBUG_ANY,
                  "ISDN_CMD_SETEAZ (id: %d, ch: %ld, number: %s)",
                  cntrl->driver, cntrl->arg, cntrl->parm.num);
            break;
      case ISDN_CMD_SETL2: /* Set L2 to given protocol */
            gig_dbg(DEBUG_ANY, "ISDN_CMD_SETL2 (ch: %ld, proto: %lx)",
                  cntrl->arg & 0xff, (cntrl->arg >> 8));

            if ((cntrl->arg & 0xff) >= cs->channels) {
                  err("ISDN_CMD_SETL2: 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;
            }

            gig_dbg(DEBUG_CMD, "scheduling PROTO_L2");
            gigaset_schedule_event(cs);
            break;
      case ISDN_CMD_SETL3: /* Set L3 to given protocol */
            gig_dbg(DEBUG_ANY, "ISDN_CMD_SETL3 (ch: %ld, proto: %lx)",
                  cntrl->arg & 0xff, (cntrl->arg >> 8));

            if ((cntrl->arg & 0xff) >= cs->channels) {
                  err("ISDN_CMD_SETL3: invalid channel (%u)",
                      (unsigned) cntrl->arg & 0xff);
                  return -EINVAL;
            }

            if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) {
                  err("ISDN_CMD_SETL3: invalid protocol %lu",
                      cntrl->arg >> 8);
                  return -EINVAL;
            }

            break;
      case ISDN_CMD_PROCEED:
            gig_dbg(DEBUG_ANY, "ISDN_CMD_PROCEED"); //FIXME
            break;
      case ISDN_CMD_ALERT:
            gig_dbg(DEBUG_ANY, "ISDN_CMD_ALERT"); //FIXME
            if (cntrl->arg >= cs->channels) {
                  err("ISDN_CMD_ALERT: invalid channel (%d)",
                      (int) cntrl->arg);
                  return -EINVAL;
            }
            //bcs = cs->bcs + cntrl->arg;
            //bcs->proto2 = -1;
            // FIXME
            break;
      case ISDN_CMD_REDIR:
            gig_dbg(DEBUG_ANY, "ISDN_CMD_REDIR"); //FIXME
            break;
      case ISDN_CMD_PROT_IO:
            gig_dbg(DEBUG_ANY, "ISDN_CMD_PROT_IO");
            break;
      case ISDN_CMD_FAXCMD:
            gig_dbg(DEBUG_ANY, "ISDN_CMD_FAXCMD");
            break;
      case ISDN_CMD_GETL2:
            gig_dbg(DEBUG_ANY, "ISDN_CMD_GETL2");
            break;
      case ISDN_CMD_GETL3:
            gig_dbg(DEBUG_ANY, "ISDN_CMD_GETL3");
            break;
      case ISDN_CMD_GETEAZ:
            gig_dbg(DEBUG_ANY, "ISDN_CMD_GETEAZ");
            break;
      case ISDN_CMD_SETSIL:
            gig_dbg(DEBUG_ANY, "ISDN_CMD_SETSIL");
            break;
      case ISDN_CMD_GETSIL:
            gig_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:
            dev_err(bcs->cs->dev, "%s: invalid L2 protocol: %u\n",
                  __func__, 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))) {
                  dev_err(bcs->cs->dev, "out of memory\n");
                  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:
            dev_err(at_state->cs->dev, "%s: invalid protocol: %u\n",
                  __func__, 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))) {
                  dev_err(at_state->cs->dev, "out of memory\n");
                  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 {
            dev_warn(cs->dev, "RING ignored - unsupported BC %s\n",
                 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) {
            dev_notice(cs->dev, "no channel for incoming call\n");
            response.command = ISDN_STAT_ICALLW;
            response.arg = 0; //FIXME
      } else {
            gig_dbg(DEBUG_CMD, "Sending ICALL");
            response.command = ISDN_STAT_ICALL;
            response.arg = bcs->channel; //FIXME
      }
      response.driver = cs->myid;
      retval = cs->iif.statcallb(&response);
      gig_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 */
            dev_warn(cs->dev,
                   "LL requested unsupported feature: Incomplete Number\n");
            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 */
            dev_warn(cs->dev,
                   "LL requested unsupported feature: Call Deflection\n");
            return ICALL_IGNORE;
      default:
            dev_err(cs->dev, "LL error %d on ICALL\n", retval);
            return ICALL_IGNORE;
      }
}

/* Set Callback function pointer */
int gigaset_register_to_LL(struct cardstate *cs, const char *isdnid)
{
      isdn_if *iif = &cs->iif;

      gig_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;
      iif->maxbufsize = MAX_BUF_SIZE;
      iif->features = ISDN_FEATURE_L2_TRANS |
            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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