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hycapi.c

/* $Id: hycapi.c,v 1.8.6.4 2001/09/23 22:24:54 kai Exp $
 *
 * Linux driver for HYSDN cards, CAPI2.0-Interface.
 *
 * Author    Ulrich Albrecht <u.albrecht@hypercope.de> for Hypercope GmbH
 * Copyright 2000 by Hypercope GmbH
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/module.h>
#include <linux/signal.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>

#define     VER_DRIVER  0
#define     VER_CARDTYPE      1
#define     VER_HWID    2
#define     VER_SERIAL  3
#define     VER_OPTION  4
#define     VER_PROTO   5
#define     VER_PROFILE 6
#define     VER_CAPI    7

#include "hysdn_defs.h"
#include <linux/kernelcapi.h>

static char hycapi_revision[]="$Revision: 1.8.6.4 $";

unsigned int hycapi_enable = 0xffffffff; 
module_param(hycapi_enable, uint, 0);

typedef struct _hycapi_appl {
      unsigned int ctrl_mask;
      capi_register_params rp;
      struct sk_buff *listen_req[CAPI_MAXCONTR];
} hycapi_appl;

static hycapi_appl hycapi_applications[CAPI_MAXAPPL];

static u16 hycapi_send_message(struct capi_ctr *ctrl, struct sk_buff *skb);

static inline int _hycapi_appCheck(int app_id, int ctrl_no)
{
      if((ctrl_no <= 0) || (ctrl_no > CAPI_MAXCONTR) || (app_id <= 0) ||
         (app_id > CAPI_MAXAPPL))
      {
            printk(KERN_ERR "HYCAPI: Invalid request app_id %d for controller %d", app_id, ctrl_no);
            return -1;
      }
      return ((hycapi_applications[app_id-1].ctrl_mask & (1 << (ctrl_no-1))) != 0);
}

/******************************
Kernel-Capi callback reset_ctr
******************************/     

static void
hycapi_reset_ctr(struct capi_ctr *ctrl)
{
      hycapictrl_info *cinfo = ctrl->driverdata;

#ifdef HYCAPI_PRINTFNAMES
      printk(KERN_NOTICE "HYCAPI hycapi_reset_ctr\n");
#endif
      capilib_release(&cinfo->ncci_head);
      capi_ctr_reseted(ctrl);
}

/******************************
Kernel-Capi callback remove_ctr
******************************/     

static void
hycapi_remove_ctr(struct capi_ctr *ctrl)
{
      int i;
      hycapictrl_info *cinfo = NULL;
      hysdn_card *card = NULL;
#ifdef HYCAPI_PRINTFNAMES
      printk(KERN_NOTICE "HYCAPI hycapi_remove_ctr\n");
#endif 
      cinfo = (hycapictrl_info *)(ctrl->driverdata);
      if(!cinfo) {
            printk(KERN_ERR "No hycapictrl_info set!");
            return;
      }    
      card = cinfo->card;
      capi_ctr_suspend_output(ctrl);
      for(i=0; i<CAPI_MAXAPPL;i++) {
            if(hycapi_applications[i].listen_req[ctrl->cnr-1]) {
                  kfree_skb(hycapi_applications[i].listen_req[ctrl->cnr-1]);
                  hycapi_applications[i].listen_req[ctrl->cnr-1] = NULL;
            }
      }
      detach_capi_ctr(ctrl);
      ctrl->driverdata = NULL;
      kfree(card->hyctrlinfo);

            
      card->hyctrlinfo = NULL;
}

/***********************************************************

Queue a CAPI-message to the controller.

***********************************************************/

static void
hycapi_sendmsg_internal(struct capi_ctr *ctrl, struct sk_buff *skb)
{
      hycapictrl_info *cinfo = (hycapictrl_info *)(ctrl->driverdata);
      hysdn_card *card = cinfo->card;

      spin_lock_irq(&cinfo->lock);
#ifdef HYCAPI_PRINTFNAMES
      printk(KERN_NOTICE "hycapi_send_message\n");    
#endif
      cinfo->skbs[cinfo->in_idx++] = skb; /* add to buffer list */
      if (cinfo->in_idx >= HYSDN_MAX_CAPI_SKB)
            cinfo->in_idx = 0;      /* wrap around */
      cinfo->sk_count++;            /* adjust counter */
      if (cinfo->sk_count >= HYSDN_MAX_CAPI_SKB) {
            /* inform upper layers we're full */
            printk(KERN_ERR "HYSDN Card%d: CAPI-buffer overrun!\n",
                   card->myid);     
            capi_ctr_suspend_output(ctrl);
      }
      cinfo->tx_skb = skb;
      spin_unlock_irq(&cinfo->lock);
      schedule_work(&card->irq_queue);
}

/***********************************************************
hycapi_register_internal

Send down the CAPI_REGISTER-Command to the controller.
This functions will also be used if the adapter has been rebooted to
re-register any applications in the private list.

************************************************************/

static void 
hycapi_register_internal(struct capi_ctr *ctrl, __u16 appl,
                   capi_register_params *rp)
{
      char ExtFeatureDefaults[] = "49  /0/0/0/0,*/1,*/2,*/3,*/4,*/5,*/6,*/7,*/8,*/9,*";
      hycapictrl_info *cinfo = (hycapictrl_info *)(ctrl->driverdata);
      hysdn_card *card = cinfo->card;
      struct sk_buff *skb;
      __u16 len;
      __u8 _command = 0xa0, _subcommand = 0x80;
      __u16 MessageNumber = 0x0000;
      __u16 MessageBufferSize = 0;
      int slen = strlen(ExtFeatureDefaults);
#ifdef HYCAPI_PRINTFNAMES
      printk(KERN_NOTICE "hycapi_register_appl\n"); 
#endif
      MessageBufferSize = rp->level3cnt * rp->datablkcnt * rp->datablklen; 

      len = CAPI_MSG_BASELEN + 8 + slen + 1;
      if (!(skb = alloc_skb(len, GFP_ATOMIC))) {
            printk(KERN_ERR "HYSDN card%d: memory squeeze in hycapi_register_appl\n",
                   card->myid);
            return;
      }
      memcpy(skb_put(skb,sizeof(__u16)), &len, sizeof(__u16));
      memcpy(skb_put(skb,sizeof(__u16)), &appl, sizeof(__u16));
      memcpy(skb_put(skb,sizeof(__u8)), &_command, sizeof(_command));
      memcpy(skb_put(skb,sizeof(__u8)), &_subcommand, sizeof(_subcommand));
      memcpy(skb_put(skb,sizeof(__u16)), &MessageNumber, sizeof(__u16));
      memcpy(skb_put(skb,sizeof(__u16)), &MessageBufferSize, sizeof(__u16)); 
      memcpy(skb_put(skb,sizeof(__u16)), &(rp->level3cnt), sizeof(__u16));
      memcpy(skb_put(skb,sizeof(__u16)), &(rp->datablkcnt), sizeof(__u16));
      memcpy(skb_put(skb,sizeof(__u16)), &(rp->datablklen), sizeof(__u16));
      memcpy(skb_put(skb,slen), ExtFeatureDefaults, slen);
      hycapi_applications[appl-1].ctrl_mask |= (1 << (ctrl->cnr-1));    
      hycapi_send_message(ctrl, skb);    
}

/************************************************************
hycapi_restart_internal

After an adapter has been rebootet, re-register all applications and
send a LISTEN_REQ (if there has been such a thing )

*************************************************************/

static void hycapi_restart_internal(struct capi_ctr *ctrl)
{
      int i;
      struct sk_buff *skb;
#ifdef HYCAPI_PRINTFNAMES
      printk(KERN_WARNING "HYSDN: hycapi_restart_internal");
#endif
      for(i=0; i<CAPI_MAXAPPL; i++) {
            if(_hycapi_appCheck(i+1, ctrl->cnr) == 1) {
                  hycapi_register_internal(ctrl, i+1, 
                                     &hycapi_applications[i].rp);
                  if(hycapi_applications[i].listen_req[ctrl->cnr-1]) {
                        skb = skb_copy(hycapi_applications[i].listen_req[ctrl->cnr-1], GFP_ATOMIC);
                        hycapi_sendmsg_internal(ctrl, skb);
                  }
            }
      }
}

/*************************************************************
Register an application.
Error-checking is done for CAPI-compliance.

The application is recorded in the internal list.
*************************************************************/

static void
hycapi_register_appl(struct capi_ctr *ctrl, __u16 appl, 
                 capi_register_params *rp)
{
      int MaxLogicalConnections = 0, MaxBDataBlocks = 0, MaxBDataLen = 0;
      hycapictrl_info *cinfo = (hycapictrl_info *)(ctrl->driverdata);
      hysdn_card *card = cinfo->card;
      int chk = _hycapi_appCheck(appl, ctrl->cnr);
      if(chk < 0) {
            return;
      }
      if(chk == 1) {
            printk(KERN_INFO "HYSDN: apl %d already registered\n", appl);
            return;
      }
      MaxBDataBlocks = rp->datablkcnt > CAPI_MAXDATAWINDOW ? CAPI_MAXDATAWINDOW : rp->datablkcnt;
      rp->datablkcnt = MaxBDataBlocks;
      MaxBDataLen = rp->datablklen < 1024 ? 1024 : rp->datablklen ;
      rp->datablklen = MaxBDataLen;
      
      MaxLogicalConnections = rp->level3cnt;
      if (MaxLogicalConnections < 0) {
            MaxLogicalConnections = card->bchans * -MaxLogicalConnections; 
      }
      if (MaxLogicalConnections == 0) {
            MaxLogicalConnections = card->bchans;
      }
      
      rp->level3cnt = MaxLogicalConnections;
      memcpy(&hycapi_applications[appl-1].rp, 
             rp, sizeof(capi_register_params));
}

/*********************************************************************

hycapi_release_internal

Send down a CAPI_RELEASE to the controller.
*********************************************************************/

static void hycapi_release_internal(struct capi_ctr *ctrl, __u16 appl)
{
      hycapictrl_info *cinfo = (hycapictrl_info *)(ctrl->driverdata);
      hysdn_card *card = cinfo->card;
      struct sk_buff *skb;
      __u16 len;
      __u8 _command = 0xa1, _subcommand = 0x80;
      __u16 MessageNumber = 0x0000;

      capilib_release_appl(&cinfo->ncci_head, appl);

#ifdef HYCAPI_PRINTFNAMES
      printk(KERN_NOTICE "hycapi_release_appl\n");
#endif
      len = CAPI_MSG_BASELEN;
      if (!(skb = alloc_skb(len, GFP_ATOMIC))) {
            printk(KERN_ERR "HYSDN card%d: memory squeeze in hycapi_register_appl\n",
                   card->myid);
            return;
      }
      memcpy(skb_put(skb,sizeof(__u16)), &len, sizeof(__u16));
      memcpy(skb_put(skb,sizeof(__u16)), &appl, sizeof(__u16));
      memcpy(skb_put(skb,sizeof(__u8)), &_command, sizeof(_command));
      memcpy(skb_put(skb,sizeof(__u8)), &_subcommand, sizeof(_subcommand));
      memcpy(skb_put(skb,sizeof(__u16)), &MessageNumber, sizeof(__u16));    
      hycapi_send_message(ctrl, skb);    
      hycapi_applications[appl-1].ctrl_mask &= ~(1 << (ctrl->cnr-1));    
}

/******************************************************************
hycapi_release_appl

Release the application from the internal list an remove it's 
registration at controller-level
******************************************************************/

static void
hycapi_release_appl(struct capi_ctr *ctrl, __u16 appl)
{
      int chk;

      chk = _hycapi_appCheck(appl, ctrl->cnr);
      if(chk<0) {
            printk(KERN_ERR "HYCAPI: Releasing invalid appl %d on controller %d\n", appl, ctrl->cnr);
            return;
      }
      if(hycapi_applications[appl-1].listen_req[ctrl->cnr-1]) {
            kfree_skb(hycapi_applications[appl-1].listen_req[ctrl->cnr-1]);
            hycapi_applications[appl-1].listen_req[ctrl->cnr-1] = NULL;
      }
      if(chk == 1)
      {
            hycapi_release_internal(ctrl, appl);
      }
}


/**************************************************************
Kill a single controller.
**************************************************************/

int hycapi_capi_release(hysdn_card *card)
{
      hycapictrl_info *cinfo = card->hyctrlinfo;
      struct capi_ctr *ctrl;
#ifdef HYCAPI_PRINTFNAMES
      printk(KERN_NOTICE "hycapi_capi_release\n");
#endif
      if(cinfo) {
            ctrl = &cinfo->capi_ctrl;
            hycapi_remove_ctr(ctrl);
      }
      return 0;
}

/**************************************************************
hycapi_capi_stop

Stop CAPI-Output on a card. (e.g. during reboot)
***************************************************************/

int hycapi_capi_stop(hysdn_card *card)
{
      hycapictrl_info *cinfo = card->hyctrlinfo;
      struct capi_ctr *ctrl;
#ifdef HYCAPI_PRINTFNAMES
      printk(KERN_NOTICE "hycapi_capi_stop\n");
#endif
      if(cinfo) {
            ctrl = &cinfo->capi_ctrl;
/*          ctrl->suspend_output(ctrl); */
            capi_ctr_reseted(ctrl);
      }
      return 0;
}

/***************************************************************
hycapi_send_message

Send a message to the controller.

Messages are parsed for their Command/Subcommand-type, and appropriate
action's are performed.

Note that we have to muck around with a 64Bit-DATA_REQ as there are
firmware-releases that do not check the MsgLen-Indication!

***************************************************************/

static u16 hycapi_send_message(struct capi_ctr *ctrl, struct sk_buff *skb)
{
      __u16 appl_id;
      int _len, _len2;
      __u8 msghead[64];
      hycapictrl_info *cinfo = ctrl->driverdata;
      u16 retval = CAPI_NOERROR;

      appl_id = CAPIMSG_APPID(skb->data);
      switch(_hycapi_appCheck(appl_id, ctrl->cnr))
      {
            case 0:
/*                printk(KERN_INFO "Need to register\n"); */
                  hycapi_register_internal(ctrl, 
                                     appl_id,
                                     &(hycapi_applications[appl_id-1].rp));
                  break;
            case 1:
                  break;
            default:
                  printk(KERN_ERR "HYCAPI: Controller mixup!\n");
                  retval = CAPI_ILLAPPNR;
                  goto out;
      }
      switch(CAPIMSG_CMD(skb->data)) {          
            case CAPI_DISCONNECT_B3_RESP:
                  capilib_free_ncci(&cinfo->ncci_head, appl_id, 
                                CAPIMSG_NCCI(skb->data));
                  break;
            case CAPI_DATA_B3_REQ:
                  _len = CAPIMSG_LEN(skb->data);
                  if (_len > 22) {
                        _len2 = _len - 22;
                        skb_copy_from_linear_data(skb, msghead, 22);
                        skb_copy_to_linear_data_offset(skb, _len2,
                                                 msghead, 22);
                        skb_pull(skb, _len2);
                        CAPIMSG_SETLEN(skb->data, 22);
                        retval = capilib_data_b3_req(&cinfo->ncci_head,
                                               CAPIMSG_APPID(skb->data),
                                               CAPIMSG_NCCI(skb->data),
                                               CAPIMSG_MSGID(skb->data));
                  }
                  break;
            case CAPI_LISTEN_REQ:
                  if(hycapi_applications[appl_id-1].listen_req[ctrl->cnr-1])
                  {
                        kfree_skb(hycapi_applications[appl_id-1].listen_req[ctrl->cnr-1]);
                        hycapi_applications[appl_id-1].listen_req[ctrl->cnr-1] = NULL;
                  }
                  if (!(hycapi_applications[appl_id-1].listen_req[ctrl->cnr-1] = skb_copy(skb, GFP_ATOMIC))) 
                  {
                        printk(KERN_ERR "HYSDN: memory squeeze in private_listen\n");
                  } 
                  break;
            default:
                  break;
      }
 out:
      if (retval == CAPI_NOERROR)
            hycapi_sendmsg_internal(ctrl, skb);
      else 
            dev_kfree_skb_any(skb);

      return retval;
}

/*********************************************************************
hycapi_read_proc

Informations provided in the /proc/capi-entries.

*********************************************************************/

static int hycapi_read_proc(char *page, char **start, off_t off,
                      int count, int *eof, struct capi_ctr *ctrl)
{
      hycapictrl_info *cinfo = (hycapictrl_info *)(ctrl->driverdata);
      hysdn_card *card = cinfo->card;
      int len = 0;
      char *s;
#ifdef HYCAPI_PRINTFNAMES
      printk(KERN_NOTICE "hycapi_read_proc\n");    
#endif
      len += sprintf(page+len, "%-16s %s\n", "name", cinfo->cardname);
      len += sprintf(page+len, "%-16s 0x%x\n", "io", card->iobase);
      len += sprintf(page+len, "%-16s %d\n", "irq", card->irq);
    
      switch (card->brdtype) {
            case BD_PCCARD:  s = "HYSDN Hycard"; break;
            case BD_ERGO: s = "HYSDN Ergo2"; break;
            case BD_METRO: s = "HYSDN Metro4"; break;
            case BD_CHAMP2: s = "HYSDN Champ2"; break;
            case BD_PLEXUS: s = "HYSDN Plexus30"; break;
            default: s = "???"; break;
      }
      len += sprintf(page+len, "%-16s %s\n", "type", s);
      if ((s = cinfo->version[VER_DRIVER]) != 0)
            len += sprintf(page+len, "%-16s %s\n", "ver_driver", s);
      if ((s = cinfo->version[VER_CARDTYPE]) != 0)
            len += sprintf(page+len, "%-16s %s\n", "ver_cardtype", s);
      if ((s = cinfo->version[VER_SERIAL]) != 0)
            len += sprintf(page+len, "%-16s %s\n", "ver_serial", s);
    
      len += sprintf(page+len, "%-16s %s\n", "cardname", cinfo->cardname);
    
      if (off+count >= len)
            *eof = 1;
      if (len < off)
            return 0;
      *start = page + off;
      return ((count < len-off) ? count : len-off);
}

/**************************************************************
hycapi_load_firmware

This does NOT load any firmware, but the callback somehow is needed
on capi-interface registration.

**************************************************************/

static int hycapi_load_firmware(struct capi_ctr *ctrl, capiloaddata *data)
{
#ifdef HYCAPI_PRINTFNAMES
      printk(KERN_NOTICE "hycapi_load_firmware\n");    
#endif
      return 0;
}


static char *hycapi_procinfo(struct capi_ctr *ctrl)
{
      hycapictrl_info *cinfo = (hycapictrl_info *)(ctrl->driverdata);
#ifdef HYCAPI_PRINTFNAMES
      printk(KERN_NOTICE "hycapi_proc_info\n");    
#endif
      if (!cinfo)
            return "";
      sprintf(cinfo->infobuf, "%s %s 0x%x %d %s",
            cinfo->cardname[0] ? cinfo->cardname : "-",
            cinfo->version[VER_DRIVER] ? cinfo->version[VER_DRIVER] : "-",
            cinfo->card ? cinfo->card->iobase : 0x0,
            cinfo->card ? cinfo->card->irq : 0,
            hycapi_revision
            );
      return cinfo->infobuf;
}

/******************************************************************
hycapi_rx_capipkt

Receive a capi-message.

All B3_DATA_IND are converted to 64K-extension compatible format.
New nccis are created if necessary.
*******************************************************************/

void
hycapi_rx_capipkt(hysdn_card * card, unsigned char *buf, unsigned short len)
{
      struct sk_buff *skb;
      hycapictrl_info *cinfo = card->hyctrlinfo;
      struct capi_ctr *ctrl;
      __u16 ApplId;
      __u16 MsgLen, info;
      __u16 len2, CapiCmd;
      __u32 CP64[2] = {0,0};
#ifdef HYCAPI_PRINTFNAMES
      printk(KERN_NOTICE "hycapi_rx_capipkt\n");    
#endif
      if(!cinfo) {
            return;
      }
      ctrl = &cinfo->capi_ctrl;
      if(len < CAPI_MSG_BASELEN) {
            printk(KERN_ERR "HYSDN Card%d: invalid CAPI-message, lenght %d!\n",
                   card->myid, len);
            return;
      }     
      MsgLen = CAPIMSG_LEN(buf);
      ApplId = CAPIMSG_APPID(buf);
      CapiCmd = CAPIMSG_CMD(buf);
      
      if((CapiCmd == CAPI_DATA_B3_IND) && (MsgLen < 30)) {
            len2 = len + (30 - MsgLen);
            if (!(skb = alloc_skb(len2, GFP_ATOMIC))) {
                  printk(KERN_ERR "HYSDN Card%d: incoming packet dropped\n",
                         card->myid);
                  return;
            }
            memcpy(skb_put(skb, MsgLen), buf, MsgLen);
            memcpy(skb_put(skb, 2*sizeof(__u32)), CP64, 2* sizeof(__u32));
            memcpy(skb_put(skb, len - MsgLen), buf + MsgLen,
                   len - MsgLen);
            CAPIMSG_SETLEN(skb->data, 30);
      } else {
            if (!(skb = alloc_skb(len, GFP_ATOMIC))) {
                  printk(KERN_ERR "HYSDN Card%d: incoming packet dropped\n",
                         card->myid);
                  return;
            }
            memcpy(skb_put(skb, len), buf, len);
      }
      switch(CAPIMSG_CMD(skb->data)) 
      {
            case CAPI_CONNECT_B3_CONF:
/* Check info-field for error-indication: */
                  info = CAPIMSG_U16(skb->data, 12);
                  switch(info)
                  {
                        case 0:
                              capilib_new_ncci(&cinfo->ncci_head, ApplId, CAPIMSG_NCCI(skb->data), 
                                           hycapi_applications[ApplId-1].rp.datablkcnt); 
                              
                              break;
                        case 0x0001:
                              printk(KERN_ERR "HYSDN Card%d: NCPI not supported by current "
                                     "protocol. NCPI ignored.\n", card->myid);
                              break;
                        case 0x2001:
                              printk(KERN_ERR "HYSDN Card%d: Message not supported in"
                                     " current state\n", card->myid);
                              break;
                        case 0x2002:
                              printk(KERN_ERR "HYSDN Card%d: invalid PLCI\n", card->myid);
                              break;            
                        case 0x2004:
                              printk(KERN_ERR "HYSDN Card%d: out of NCCI\n", card->myid);
                              break;                        
                        case 0x3008:
                              printk(KERN_ERR "HYSDN Card%d: NCPI not supported\n", 
                                     card->myid);
                              break;      
                        default:
                              printk(KERN_ERR "HYSDN Card%d: Info in CONNECT_B3_CONF: %d\n", 
                                     card->myid, info);
                              break;                  
                  }
                  break;
            case CAPI_CONNECT_B3_IND:
                  capilib_new_ncci(&cinfo->ncci_head, ApplId, 
                               CAPIMSG_NCCI(skb->data), 
                               hycapi_applications[ApplId-1].rp.datablkcnt);
                  break;
              case CAPI_DATA_B3_CONF:
                  capilib_data_b3_conf(&cinfo->ncci_head, ApplId,
                                   CAPIMSG_NCCI(skb->data),
                                   CAPIMSG_MSGID(skb->data));
                  break;
            default:
                  break;
      }
      capi_ctr_handle_message(ctrl, ApplId, skb);
}

/******************************************************************
hycapi_tx_capiack

Internally acknowledge a msg sent. This will remove the msg from the
internal queue.

*******************************************************************/

void hycapi_tx_capiack(hysdn_card * card)
{
      hycapictrl_info *cinfo = card->hyctrlinfo;
#ifdef HYCAPI_PRINTFNAMES
      printk(KERN_NOTICE "hycapi_tx_capiack\n");    
#endif
      if(!cinfo) {
            return;
      }
      spin_lock_irq(&cinfo->lock);
      kfree_skb(cinfo->skbs[cinfo->out_idx]);         /* free skb */
      cinfo->skbs[cinfo->out_idx++] = NULL;
      if (cinfo->out_idx >= HYSDN_MAX_CAPI_SKB)
            cinfo->out_idx = 0;     /* wrap around */

      if (cinfo->sk_count-- == HYSDN_MAX_CAPI_SKB)    /* dec usage count */
            capi_ctr_resume_output(&cinfo->capi_ctrl);
      spin_unlock_irq(&cinfo->lock);
}

/***************************************************************
hycapi_tx_capiget(hysdn_card *card)

This is called when polling for messages to SEND.

****************************************************************/

struct sk_buff *
hycapi_tx_capiget(hysdn_card *card)
{
      hycapictrl_info *cinfo = card->hyctrlinfo;
      if(!cinfo) {
            return (struct sk_buff *)NULL;
      }
      if (!cinfo->sk_count)
            return (struct sk_buff *)NULL;      /* nothing available */

      return (cinfo->skbs[cinfo->out_idx]);           /* next packet to send */
}


/**********************************************************
int hycapi_init()

attach the capi-driver to the kernel-capi.

***********************************************************/

int hycapi_init(void)
{
      int i;
      for(i=0;i<CAPI_MAXAPPL;i++) {
            memset(&(hycapi_applications[i]), 0, sizeof(hycapi_appl));
      }
      return(0);
}

/**************************************************************
hycapi_cleanup(void)

detach the capi-driver to the kernel-capi. Actually this should
free some more ressources. Do that later.
**************************************************************/

void 
hycapi_cleanup(void)
{
}

/********************************************************************
hycapi_capi_create(hysdn_card *card)

Attach the card with its capi-ctrl.
*********************************************************************/

static void hycapi_fill_profile(hysdn_card *card)
{
      hycapictrl_info *cinfo = NULL;
      struct capi_ctr *ctrl = NULL;
      cinfo = card->hyctrlinfo;
      if(!cinfo) return;
      ctrl = &cinfo->capi_ctrl;
      strcpy(ctrl->manu, "Hypercope");    
      ctrl->version.majorversion = 2;
      ctrl->version.minorversion = 0;
      ctrl->version.majormanuversion = 3;
      ctrl->version.minormanuversion = 2;
      ctrl->profile.ncontroller = card->myid;
      ctrl->profile.nbchannel = card->bchans;
      ctrl->profile.goptions = GLOBAL_OPTION_INTERNAL_CONTROLLER |
            GLOBAL_OPTION_B_CHANNEL_OPERATION;
      ctrl->profile.support1 =  B1_PROT_64KBIT_HDLC |
            (card->faxchans ? B1_PROT_T30 : 0) |
            B1_PROT_64KBIT_TRANSPARENT;
      ctrl->profile.support2 = B2_PROT_ISO7776 |
            (card->faxchans ? B2_PROT_T30 : 0) |
            B2_PROT_TRANSPARENT;
      ctrl->profile.support3 = B3_PROT_TRANSPARENT |
            B3_PROT_T90NL |
            (card->faxchans ? B3_PROT_T30 : 0) |
            (card->faxchans ? B3_PROT_T30EXT : 0) |
            B3_PROT_ISO8208;
}     

int 
hycapi_capi_create(hysdn_card *card)
{
      hycapictrl_info *cinfo = NULL;
      struct capi_ctr *ctrl = NULL;
      int retval;
#ifdef HYCAPI_PRINTFNAMES
      printk(KERN_NOTICE "hycapi_capi_create\n");        
#endif
      if((hycapi_enable & (1 << card->myid)) == 0) {
            return 1;
      }
      if (!card->hyctrlinfo) {
            cinfo = kzalloc(sizeof(hycapictrl_info), GFP_ATOMIC);
            if (!cinfo) {
                  printk(KERN_WARNING "HYSDN: no memory for capi-ctrl.\n");
                  return -ENOMEM;
            }
            card->hyctrlinfo = cinfo;
            cinfo->card = card;
            spin_lock_init(&cinfo->lock);
            INIT_LIST_HEAD(&cinfo->ncci_head);

            switch (card->brdtype) {
                  case BD_PCCARD:  strcpy(cinfo->cardname,"HYSDN Hycard"); break;
                  case BD_ERGO: strcpy(cinfo->cardname,"HYSDN Ergo2"); break;
                  case BD_METRO: strcpy(cinfo->cardname,"HYSDN Metro4"); break;
                  case BD_CHAMP2: strcpy(cinfo->cardname,"HYSDN Champ2"); break;
                  case BD_PLEXUS: strcpy(cinfo->cardname,"HYSDN Plexus30"); break;
                  default: strcpy(cinfo->cardname,"HYSDN ???"); break;
            }

            ctrl = &cinfo->capi_ctrl;
            ctrl->driver_name   = "hycapi";
            ctrl->driverdata    = cinfo;
            ctrl->register_appl = hycapi_register_appl;
            ctrl->release_appl  = hycapi_release_appl;
            ctrl->send_message  = hycapi_send_message;
            ctrl->load_firmware = hycapi_load_firmware;
            ctrl->reset_ctr     = hycapi_reset_ctr;
            ctrl->procinfo      = hycapi_procinfo;
            ctrl->ctr_read_proc = hycapi_read_proc;
            strcpy(ctrl->name, cinfo->cardname);
            ctrl->owner = THIS_MODULE;

            retval = attach_capi_ctr(ctrl);
            if (retval) {
                  printk(KERN_ERR "hycapi: attach controller failed.\n");
                  return -EBUSY;
            }
            /* fill in the blanks: */
            hycapi_fill_profile(card);
            capi_ctr_ready(ctrl);
      } else {
            /* resume output on stopped ctrl */
            ctrl = &card->hyctrlinfo->capi_ctrl;
            hycapi_fill_profile(card);
            capi_ctr_ready(ctrl);
            hycapi_restart_internal(ctrl); 
/*          ctrl->resume_output(ctrl); */
      }
      return 0;
}

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