isdn_common.c

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/* $Id: isdn_common.c,v 1.1.2.3 2004/02/10 01:07:13 keil Exp $
 *
 * Linux ISDN subsystem, common used functions (linklevel).
 *
 * Copyright 1994-1999  by Fritz Elfert ([email protected])
 * Copyright 1995,96    Thinking Objects Software GmbH Wuerzburg
 * Copyright 1995,96    by Michael Hipp ([email protected])
 *
 * 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/init.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/isdn.h>
#include <linux/mutex.h>
#include "isdn_common.h"
#include "isdn_tty.h"
#include "isdn_net.h"
#include "isdn_ppp.h"
#ifdef CONFIG_ISDN_AUDIO
#include "isdn_audio.h"
#endif
#ifdef CONFIG_ISDN_DIVERSION_MODULE
#define CONFIG_ISDN_DIVERSION
#endif
#ifdef CONFIG_ISDN_DIVERSION
#include <linux/isdn_divertif.h>
#endif /* CONFIG_ISDN_DIVERSION */
#include "isdn_v110.h"

/* Debugflags */
#undef ISDN_DEBUG_STATCALLB

MODULE_DESCRIPTION("ISDN4Linux: link layer");
MODULE_AUTHOR("Fritz Elfert");
MODULE_LICENSE("GPL");

isdn_dev *dev;

static DEFINE_MUTEX(isdn_mutex);
static char *isdn_revision = "$Revision: 1.1.2.3 $";

extern char *isdn_net_revision;
#ifdef CONFIG_ISDN_PPP
extern char *isdn_ppp_revision;
#else
static char *isdn_ppp_revision = ": none $";
#endif
#ifdef CONFIG_ISDN_AUDIO
extern char *isdn_audio_revision;
#else
static char *isdn_audio_revision = ": none $";
#endif
extern char *isdn_v110_revision;

#ifdef CONFIG_ISDN_DIVERSION
static isdn_divert_if *divert_if; /* = NULL */
#endif /* CONFIG_ISDN_DIVERSION */


static int isdn_writebuf_stub(int, int, const u_char __user *, int);
static void set_global_features(void);
static int isdn_wildmat(char *s, char *p);
static int isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding);

static inline void
isdn_lock_driver(isdn_driver_t *drv)
{
    try_module_get(drv->interface->owner);
    drv->locks++;
}

void
isdn_lock_drivers(void)
{
    int i;

    for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
        if (!dev->drv[i])
            continue;
        isdn_lock_driver(dev->drv[i]);
    }
}

static inline void
isdn_unlock_driver(isdn_driver_t *drv)
{
    if (drv->locks > 0) {
        drv->locks--;
        module_put(drv->interface->owner);
    }
}

void
isdn_unlock_drivers(void)
{
    int i;

    for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
        if (!dev->drv[i])
            continue;
        isdn_unlock_driver(dev->drv[i]);
    }
}

#if defined(ISDN_DEBUG_NET_DUMP) || defined(ISDN_DEBUG_MODEM_DUMP)
void
isdn_dumppkt(char *s, u_char *p, int len, int dumplen)
{
    int dumpc;

    printk(KERN_DEBUG "%s(%d) ", s, len);
    for (dumpc = 0; (dumpc < dumplen) && (len); len--, dumpc++)
        printk(" %02x", *p++);
    printk("\n");
}
#endif

/*
 * I picked the pattern-matching-functions from an old GNU-tar version (1.10)
 * It was originally written and put to PD by [email protected] (Rich Salz)
 */
static int
isdn_star(char *s, char *p)
{
    while (isdn_wildmat(s, p)) {
        if (*++s == '\0')
            return (2);
    }
    return (0);
}

/*
 * Shell-type Pattern-matching for incoming caller-Ids
 * This function gets a string in s and checks, if it matches the pattern
 * given in p.
 *
 * Return:
 *   0 = match.
 *   1 = no match.
 *   2 = no match. Would eventually match, if s would be longer.
 *
 * Possible Patterns:
 *
 * '?'     matches one character
 * '*'     matches zero or more characters
 * [xyz]   matches the set of characters in brackets.
 * [^xyz]  matches any single character not in the set of characters
 */

static int
isdn_wildmat(char *s, char *p)
{
    register int last;
    register int matched;
    register int reverse;
    register int nostar = 1;

    if (!(*s) && !(*p))
        return (1);
    for (; *p; s++, p++)
        switch (*p) {
        case '\\':
            /*
             * Literal match with following character,
             * fall through.
             */
            p++;
        default:
            if (*s != *p)
                return (*s == '\0') ? 2 : 1;
                    continue;
        case '?':
            /* Match anything. */
            if (*s == '\0')
                return (2);
            continue;
        case '*':
            nostar = 0;
            /* Trailing star matches everything. */
            return (*++p ? isdn_star(s, p) : 0);
        case '[':
            /* [^....] means inverse character class. */
            if ((reverse = (p[1] == '^')))
                p++;
            for (last = 0, matched = 0; *++p && (*p != ']'); last = *p)
                /* This next line requires a good C compiler. */
                if (*p == '-' ? *s <= *++p && *s >= last : *s == *p)
                    matched = 1;
            if (matched == reverse)
                return (1);
            continue;
        }
    return (*s == '\0') ? 0 : nostar;
}

int isdn_msncmp(const char *msn1, const char *msn2)
{
    char TmpMsn1[ISDN_MSNLEN];
    char TmpMsn2[ISDN_MSNLEN];
    char *p;

    for (p = TmpMsn1; *msn1 && *msn1 != ':';)  // Strip off a SPID
        *p++ = *msn1++;
    *p = '\0';

    for (p = TmpMsn2; *msn2 && *msn2 != ':';)  // Strip off a SPID
        *p++ = *msn2++;
    *p = '\0';

    return isdn_wildmat(TmpMsn1, TmpMsn2);
}

int
isdn_dc2minor(int di, int ch)
{
    int i;
    for (i = 0; i < ISDN_MAX_CHANNELS; i++)
        if (dev->chanmap[i] == ch && dev->drvmap[i] == di)
            return i;
    return -1;
}

static int isdn_timer_cnt1 = 0;
static int isdn_timer_cnt2 = 0;
static int isdn_timer_cnt3 = 0;

static void
isdn_timer_funct(ulong dummy)
{
    int tf = dev->tflags;
    if (tf & ISDN_TIMER_FAST) {
        if (tf & ISDN_TIMER_MODEMREAD)
            isdn_tty_readmodem();
        if (tf & ISDN_TIMER_MODEMPLUS)
            isdn_tty_modem_escape();
        if (tf & ISDN_TIMER_MODEMXMIT)
            isdn_tty_modem_xmit();
    }
    if (tf & ISDN_TIMER_SLOW) {
        if (++isdn_timer_cnt1 >= ISDN_TIMER_02SEC) {
            isdn_timer_cnt1 = 0;
            if (tf & ISDN_TIMER_NETDIAL)
                isdn_net_dial();
        }
        if (++isdn_timer_cnt2 >= ISDN_TIMER_1SEC) {
            isdn_timer_cnt2 = 0;
            if (tf & ISDN_TIMER_NETHANGUP)
                isdn_net_autohup();
            if (++isdn_timer_cnt3 >= ISDN_TIMER_RINGING) {
                isdn_timer_cnt3 = 0;
                if (tf & ISDN_TIMER_MODEMRING)
                    isdn_tty_modem_ring();
            }
            if (tf & ISDN_TIMER_CARRIER)
                isdn_tty_carrier_timeout();
        }
    }
    if (tf)
        mod_timer(&dev->timer, jiffies + ISDN_TIMER_RES);
}

void
isdn_timer_ctrl(int tf, int onoff)
{
    unsigned long flags;
    int old_tflags;

    spin_lock_irqsave(&dev->timerlock, flags);
    if ((tf & ISDN_TIMER_SLOW) && (!(dev->tflags & ISDN_TIMER_SLOW))) {
        /* If the slow-timer wasn't activated until now */
        isdn_timer_cnt1 = 0;
        isdn_timer_cnt2 = 0;
    }
    old_tflags = dev->tflags;
    if (onoff)
        dev->tflags |= tf;
    else
        dev->tflags &= ~tf;
    if (dev->tflags && !old_tflags)
        mod_timer(&dev->timer, jiffies + ISDN_TIMER_RES);
    spin_unlock_irqrestore(&dev->timerlock, flags);
}

/*
 * Receive a packet from B-Channel. (Called from low-level-module)
 */
static void
isdn_receive_skb_callback(int di, int channel, struct sk_buff *skb)
{
    int i;

    if ((i = isdn_dc2minor(di, channel)) == -1) {
        dev_kfree_skb(skb);
        return;
    }
    /* Update statistics */
    dev->ibytes[i] += skb->len;

    /* First, try to deliver data to network-device */
    if (isdn_net_rcv_skb(i, skb))
        return;

    /* V.110 handling
     * makes sense for async streams only, so it is
     * called after possible net-device delivery.
     */
    if (dev->v110[i]) {
        atomic_inc(&dev->v110use[i]);
        skb = isdn_v110_decode(dev->v110[i], skb);
        atomic_dec(&dev->v110use[i]);
        if (!skb)
            return;
    }

    /* No network-device found, deliver to tty or raw-channel */
    if (skb->len) {
        if (isdn_tty_rcv_skb(i, di, channel, skb))
            return;
        wake_up_interruptible(&dev->drv[di]->rcv_waitq[channel]);
    } else
        dev_kfree_skb(skb);
}

/*
 * Intercept command from Linklevel to Lowlevel.
 * If layer 2 protocol is V.110 and this is not supported by current
 * lowlevel-driver, use driver's transparent mode and handle V.110 in
 * linklevel instead.
 */
int
isdn_command(isdn_ctrl *cmd)
{
    if (cmd->driver == -1) {
        printk(KERN_WARNING "isdn_command command(%x) driver -1\n", cmd->command);
        return (1);
    }
    if (!dev->drv[cmd->driver]) {
        printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d] NULL\n",
               cmd->command, cmd->driver);
        return (1);
    }
    if (!dev->drv[cmd->driver]->interface) {
        printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d]->interface NULL\n",
               cmd->command, cmd->driver);
        return (1);
    }
    if (cmd->command == ISDN_CMD_SETL2) {
        int idx = isdn_dc2minor(cmd->driver, cmd->arg & 255);
        unsigned long l2prot = (cmd->arg >> 8) & 255;
        unsigned long features = (dev->drv[cmd->driver]->interface->features
                      >> ISDN_FEATURE_L2_SHIFT) &
            ISDN_FEATURE_L2_MASK;
        unsigned long l2_feature = (1 << l2prot);

        switch (l2prot) {
        case ISDN_PROTO_L2_V11096:
        case ISDN_PROTO_L2_V11019:
        case ISDN_PROTO_L2_V11038:
            /* If V.110 requested, but not supported by
             * HL-driver, set emulator-flag and change
             * Layer-2 to transparent
             */
            if (!(features & l2_feature)) {
                dev->v110emu[idx] = l2prot;
                cmd->arg = (cmd->arg & 255) |
                    (ISDN_PROTO_L2_TRANS << 8);
            } else
                dev->v110emu[idx] = 0;
        }
    }
    return dev->drv[cmd->driver]->interface->command(cmd);
}

void
isdn_all_eaz(int di, int ch)
{
    isdn_ctrl cmd;

    if (di < 0)
        return;
    cmd.driver = di;
    cmd.arg = ch;
    cmd.command = ISDN_CMD_SETEAZ;
    cmd.parm.num[0] = '\0';
    isdn_command(&cmd);
}

/*
 * Begin of a CAPI like LL<->HL interface, currently used only for
 * supplementary service (CAPI 2.0 part III)
 */
#include <linux/isdn/capicmd.h>

static int
isdn_capi_rec_hl_msg(capi_msg *cm)
{
    switch (cm->Command) {
    case CAPI_FACILITY:
        /* in the moment only handled in tty */
        return (isdn_tty_capi_facility(cm));
    default:
        return (-1);
    }
}

static int
isdn_status_callback(isdn_ctrl *c)
{
    int di;
    u_long flags;
    int i;
    int r;
    int retval = 0;
    isdn_ctrl cmd;
    isdn_net_dev *p;

    di = c->driver;
    i = isdn_dc2minor(di, c->arg);
    switch (c->command) {
    case ISDN_STAT_BSENT:
        if (i < 0)
            return -1;
        if (dev->global_flags & ISDN_GLOBAL_STOPPED)
            return 0;
        if (isdn_net_stat_callback(i, c))
            return 0;
        if (isdn_v110_stat_callback(i, c))
            return 0;
        if (isdn_tty_stat_callback(i, c))
            return 0;
        wake_up_interruptible(&dev->drv[di]->snd_waitq[c->arg]);
        break;
    case ISDN_STAT_STAVAIL:
        dev->drv[di]->stavail += c->arg;
        wake_up_interruptible(&dev->drv[di]->st_waitq);
        break;
    case ISDN_STAT_RUN:
        dev->drv[di]->flags |= DRV_FLAG_RUNNING;
        for (i = 0; i < ISDN_MAX_CHANNELS; i++)
            if (dev->drvmap[i] == di)
                isdn_all_eaz(di, dev->chanmap[i]);
        set_global_features();
        break;
    case ISDN_STAT_STOP:
        dev->drv[di]->flags &= ~DRV_FLAG_RUNNING;
        break;
    case ISDN_STAT_ICALL:
        if (i < 0)
            return -1;
#ifdef ISDN_DEBUG_STATCALLB
        printk(KERN_DEBUG "ICALL (net): %d %ld %s\n", di, c->arg, c->parm.num);
#endif
        if (dev->global_flags & ISDN_GLOBAL_STOPPED) {
            cmd.driver = di;
            cmd.arg = c->arg;
            cmd.command = ISDN_CMD_HANGUP;
            isdn_command(&cmd);
            return 0;
        }
        /* Try to find a network-interface which will accept incoming call */
        r = ((c->command == ISDN_STAT_ICALLW) ? 0 : isdn_net_find_icall(di, c->arg, i, &c->parm.setup));
        switch (r) {
        case 0:
            /* No network-device replies.
             * Try ttyI's.
             * These return 0 on no match, 1 on match and
             * 3 on eventually match, if CID is longer.
             */
            if (c->command == ISDN_STAT_ICALL)
                if ((retval = isdn_tty_find_icall(di, c->arg, &c->parm.setup))) return (retval);
#ifdef CONFIG_ISDN_DIVERSION
            if (divert_if)
                if ((retval = divert_if->stat_callback(c)))
                    return (retval); /* processed */
#endif /* CONFIG_ISDN_DIVERSION */
            if ((!retval) && (dev->drv[di]->flags & DRV_FLAG_REJBUS)) {
                /* No tty responding */
                cmd.driver = di;
                cmd.arg = c->arg;
                cmd.command = ISDN_CMD_HANGUP;
                isdn_command(&cmd);
                retval = 2;
            }
            break;
        case 1:
            /* Schedule connection-setup */
            isdn_net_dial();
            cmd.driver = di;
            cmd.arg = c->arg;
            cmd.command = ISDN_CMD_ACCEPTD;
            for (p = dev->netdev; p; p = p->next)
                if (p->local->isdn_channel == cmd.arg)
                {
                    strcpy(cmd.parm.setup.eazmsn, p->local->msn);
                    isdn_command(&cmd);
                    retval = 1;
                    break;
                }
            break;

        case 2: /* For calling back, first reject incoming call ... */
        case 3: /* Interface found, but down, reject call actively  */
            retval = 2;
            printk(KERN_INFO "isdn: Rejecting Call\n");
            cmd.driver = di;
            cmd.arg = c->arg;
            cmd.command = ISDN_CMD_HANGUP;
            isdn_command(&cmd);
            if (r == 3)
                break;
            /* Fall through */
        case 4:
            /* ... then start callback. */
            isdn_net_dial();
            break;
        case 5:
            /* Number would eventually match, if longer */
            retval = 3;
            break;
        }
#ifdef ISDN_DEBUG_STATCALLB
        printk(KERN_DEBUG "ICALL: ret=%d\n", retval);
#endif
        return retval;
        break;
    case ISDN_STAT_CINF:
        if (i < 0)
            return -1;
#ifdef ISDN_DEBUG_STATCALLB
        printk(KERN_DEBUG "CINF: %ld %s\n", c->arg, c->parm.num);
#endif
        if (dev->global_flags & ISDN_GLOBAL_STOPPED)
            return 0;
        if (strcmp(c->parm.num, "0"))
            isdn_net_stat_callback(i, c);
        isdn_tty_stat_callback(i, c);
        break;
    case ISDN_STAT_CAUSE:
#ifdef ISDN_DEBUG_STATCALLB
        printk(KERN_DEBUG "CAUSE: %ld %s\n", c->arg, c->parm.num);
#endif
        printk(KERN_INFO "isdn: %s,ch%ld cause: %s\n",
               dev->drvid[di], c->arg, c->parm.num);
        isdn_tty_stat_callback(i, c);
#ifdef CONFIG_ISDN_DIVERSION
        if (divert_if)
            divert_if->stat_callback(c);
#endif /* CONFIG_ISDN_DIVERSION */
        break;
    case ISDN_STAT_DISPLAY:
#ifdef ISDN_DEBUG_STATCALLB
        printk(KERN_DEBUG "DISPLAY: %ld %s\n", c->arg, c->parm.display);
#endif
        isdn_tty_stat_callback(i, c);
#ifdef CONFIG_ISDN_DIVERSION
        if (divert_if)
            divert_if->stat_callback(c);
#endif /* CONFIG_ISDN_DIVERSION */
        break;
    case ISDN_STAT_DCONN:
        if (i < 0)
            return -1;
#ifdef ISDN_DEBUG_STATCALLB
        printk(KERN_DEBUG "DCONN: %ld\n", c->arg);
#endif
        if (dev->global_flags & ISDN_GLOBAL_STOPPED)
            return 0;
        /* Find any net-device, waiting for D-channel setup */
        if (isdn_net_stat_callback(i, c))
            break;
        isdn_v110_stat_callback(i, c);
        /* Find any ttyI, waiting for D-channel setup */
        if (isdn_tty_stat_callback(i, c)) {
            cmd.driver = di;
            cmd.arg = c->arg;
            cmd.command = ISDN_CMD_ACCEPTB;
            isdn_command(&cmd);
            break;
        }
        break;
    case ISDN_STAT_DHUP:
        if (i < 0)
            return -1;
#ifdef ISDN_DEBUG_STATCALLB
        printk(KERN_DEBUG "DHUP: %ld\n", c->arg);
#endif
        if (dev->global_flags & ISDN_GLOBAL_STOPPED)
            return 0;
        dev->drv[di]->online &= ~(1 << (c->arg));
        isdn_info_update();
        /* Signal hangup to network-devices */
        if (isdn_net_stat_callback(i, c))
            break;
        isdn_v110_stat_callback(i, c);
        if (isdn_tty_stat_callback(i, c))
            break;
#ifdef CONFIG_ISDN_DIVERSION
        if (divert_if)
            divert_if->stat_callback(c);
#endif /* CONFIG_ISDN_DIVERSION */
        break;
        break;
    case ISDN_STAT_BCONN:
        if (i < 0)
            return -1;
#ifdef ISDN_DEBUG_STATCALLB
        printk(KERN_DEBUG "BCONN: %ld\n", c->arg);
#endif
        /* Signal B-channel-connect to network-devices */
        if (dev->global_flags & ISDN_GLOBAL_STOPPED)
            return 0;
        dev->drv[di]->online |= (1 << (c->arg));
        isdn_info_update();
        if (isdn_net_stat_callback(i, c))
            break;
        isdn_v110_stat_callback(i, c);
        if (isdn_tty_stat_callback(i, c))
            break;
        break;
    case ISDN_STAT_BHUP:
        if (i < 0)
            return -1;
#ifdef ISDN_DEBUG_STATCALLB
        printk(KERN_DEBUG "BHUP: %ld\n", c->arg);
#endif
        if (dev->global_flags & ISDN_GLOBAL_STOPPED)
            return 0;
        dev->drv[di]->online &= ~(1 << (c->arg));
        isdn_info_update();
#ifdef CONFIG_ISDN_X25
        /* Signal hangup to network-devices */
        if (isdn_net_stat_callback(i, c))
            break;
#endif
        isdn_v110_stat_callback(i, c);
        if (isdn_tty_stat_callback(i, c))
            break;
        break;
    case ISDN_STAT_NODCH:
        if (i < 0)
            return -1;
#ifdef ISDN_DEBUG_STATCALLB
        printk(KERN_DEBUG "NODCH: %ld\n", c->arg);
#endif
        if (dev->global_flags & ISDN_GLOBAL_STOPPED)
            return 0;
        if (isdn_net_stat_callback(i, c))
            break;
        if (isdn_tty_stat_callback(i, c))
            break;
        break;
    case ISDN_STAT_ADDCH:
        spin_lock_irqsave(&dev->lock, flags);
        if (isdn_add_channels(dev->drv[di], di, c->arg, 1)) {
            spin_unlock_irqrestore(&dev->lock, flags);
            return -1;
        }
        spin_unlock_irqrestore(&dev->lock, flags);
        isdn_info_update();
        break;
    case ISDN_STAT_DISCH:
        spin_lock_irqsave(&dev->lock, flags);
        for (i = 0; i < ISDN_MAX_CHANNELS; i++)
            if ((dev->drvmap[i] == di) &&
                (dev->chanmap[i] == c->arg)) {
                if (c->parm.num[0])
                    dev->usage[i] &= ~ISDN_USAGE_DISABLED;
                else
                    if (USG_NONE(dev->usage[i])) {
                        dev->usage[i] |= ISDN_USAGE_DISABLED;
                    }
                    else
                        retval = -1;
                break;
            }
        spin_unlock_irqrestore(&dev->lock, flags);
        isdn_info_update();
        break;
    case ISDN_STAT_UNLOAD:
        while (dev->drv[di]->locks > 0) {
            isdn_unlock_driver(dev->drv[di]);
        }
        spin_lock_irqsave(&dev->lock, flags);
        isdn_tty_stat_callback(i, c);
        for (i = 0; i < ISDN_MAX_CHANNELS; i++)
            if (dev->drvmap[i] == di) {
                dev->drvmap[i] = -1;
                dev->chanmap[i] = -1;
                dev->usage[i] &= ~ISDN_USAGE_DISABLED;
            }
        dev->drivers--;
        dev->channels -= dev->drv[di]->channels;
        kfree(dev->drv[di]->rcverr);
        kfree(dev->drv[di]->rcvcount);
        for (i = 0; i < dev->drv[di]->channels; i++)
            skb_queue_purge(&dev->drv[di]->rpqueue[i]);
        kfree(dev->drv[di]->rpqueue);
        kfree(dev->drv[di]->rcv_waitq);
        kfree(dev->drv[di]);
        dev->drv[di] = NULL;
        dev->drvid[di][0] = '\0';
        isdn_info_update();
        set_global_features();
        spin_unlock_irqrestore(&dev->lock, flags);
        return 0;
    case ISDN_STAT_L1ERR:
        break;
    case CAPI_PUT_MESSAGE:
        return (isdn_capi_rec_hl_msg(&c->parm.cmsg));
#ifdef CONFIG_ISDN_TTY_FAX
    case ISDN_STAT_FAXIND:
        isdn_tty_stat_callback(i, c);
        break;
#endif
#ifdef CONFIG_ISDN_AUDIO
    case ISDN_STAT_AUDIO:
        isdn_tty_stat_callback(i, c);
        break;
#endif
#ifdef CONFIG_ISDN_DIVERSION
    case ISDN_STAT_PROT:
    case ISDN_STAT_REDIR:
        if (divert_if)
            return (divert_if->stat_callback(c));
#endif /* CONFIG_ISDN_DIVERSION */
    default:
        return -1;
    }
    return 0;
}

/*
 * Get integer from char-pointer, set pointer to end of number
 */
int
isdn_getnum(char **p)
{
    int v = -1;

    while (*p[0] >= '0' && *p[0] <= '9')
        v = ((v < 0) ? 0 : (v * 10)) + (int) ((*p[0]++) - '0');
    return v;
}

#define DLE 0x10

/*
 * isdn_readbchan() tries to get data from the read-queue.
 * It MUST be called with interrupts off.
 *
 * Be aware that this is not an atomic operation when sleep != 0, even though
 * interrupts are turned off! Well, like that we are currently only called
 * on behalf of a read system call on raw device files (which are documented
 * to be dangerous and for debugging purpose only). The inode semaphore
 * takes care that this is not called for the same minor device number while
 * we are sleeping, but access is not serialized against simultaneous read()
 * from the corresponding ttyI device. Can other ugly events, like changes
 * of the mapping (di,ch)<->minor, happen during the sleep? --he
 */
int
isdn_readbchan(int di, int channel, u_char *buf, u_char *fp, int len, wait_queue_head_t *sleep)
{
    int count;
    int count_pull;
    int count_put;
    int dflag;
    struct sk_buff *skb;
    u_char *cp;

    if (!dev->drv[di])
        return 0;
    if (skb_queue_empty(&dev->drv[di]->rpqueue[channel])) {
        if (sleep)
            interruptible_sleep_on(sleep);
        else
            return 0;
    }
    if (len > dev->drv[di]->rcvcount[channel])
        len = dev->drv[di]->rcvcount[channel];
    cp = buf;
    count = 0;
    while (len) {
        if (!(skb = skb_peek(&dev->drv[di]->rpqueue[channel])))
            break;
#ifdef CONFIG_ISDN_AUDIO
        if (ISDN_AUDIO_SKB_LOCK(skb))
            break;
        ISDN_AUDIO_SKB_LOCK(skb) = 1;
        if ((ISDN_AUDIO_SKB_DLECOUNT(skb)) || (dev->drv[di]->DLEflag & (1 << channel))) {
            char *p = skb->data;
            unsigned long DLEmask = (1 << channel);

            dflag = 0;
            count_pull = count_put = 0;
            while ((count_pull < skb->len) && (len > 0)) {
                len--;
                if (dev->drv[di]->DLEflag & DLEmask) {
                    *cp++ = DLE;
                    dev->drv[di]->DLEflag &= ~DLEmask;
                } else {
                    *cp++ = *p;
                    if (*p == DLE) {
                        dev->drv[di]->DLEflag |= DLEmask;
                        (ISDN_AUDIO_SKB_DLECOUNT(skb))--;
                    }
                    p++;
                    count_pull++;
                }
                count_put++;
            }
            if (count_pull >= skb->len)
                dflag = 1;
        } else {
#endif
            /* No DLE's in buff, so simply copy it */
            dflag = 1;
            if ((count_pull = skb->len) > len) {
                count_pull = len;
                dflag = 0;
            }
            count_put = count_pull;
            skb_copy_from_linear_data(skb, cp, count_put);
            cp += count_put;
            len -= count_put;
#ifdef CONFIG_ISDN_AUDIO
        }
#endif
        count += count_put;
        if (fp) {
            memset(fp, 0, count_put);
            fp += count_put;
        }
        if (dflag) {
            /* We got all the data in this buff.
             * Now we can dequeue it.
             */
            if (fp)
                *(fp - 1) = 0xff;
#ifdef CONFIG_ISDN_AUDIO
            ISDN_AUDIO_SKB_LOCK(skb) = 0;
#endif
            skb = skb_dequeue(&dev->drv[di]->rpqueue[channel]);
            dev_kfree_skb(skb);
        } else {
            /* Not yet emptied this buff, so it
             * must stay in the queue, for further calls
             * but we pull off the data we got until now.
             */
            skb_pull(skb, count_pull);
#ifdef CONFIG_ISDN_AUDIO
            ISDN_AUDIO_SKB_LOCK(skb) = 0;
#endif
        }
        dev->drv[di]->rcvcount[channel] -= count_put;
    }
    return count;
}

/*
 * isdn_readbchan_tty() tries to get data from the read-queue.
 * It MUST be called with interrupts off.
 *
 * Be aware that this is not an atomic operation when sleep != 0, even though
 * interrupts are turned off! Well, like that we are currently only called
 * on behalf of a read system call on raw device files (which are documented
 * to be dangerous and for debugging purpose only). The inode semaphore
 * takes care that this is not called for the same minor device number while
 * we are sleeping, but access is not serialized against simultaneous read()
 * from the corresponding ttyI device. Can other ugly events, like changes
 * of the mapping (di,ch)<->minor, happen during the sleep? --he
 */
int
isdn_readbchan_tty(int di, int channel, struct tty_struct *tty, int cisco_hack)
{
    int count;
    int count_pull;
    int count_put;
    int dflag;
    struct sk_buff *skb;
    char last = 0;
    int len;

    if (!dev->drv[di])
        return 0;
    if (skb_queue_empty(&dev->drv[di]->rpqueue[channel]))
        return 0;

    len = tty_buffer_request_room(tty, dev->drv[di]->rcvcount[channel]);
    if (len == 0)
        return len;

    count = 0;
    while (len) {
        if (!(skb = skb_peek(&dev->drv[di]->rpqueue[channel])))
            break;
#ifdef CONFIG_ISDN_AUDIO
        if (ISDN_AUDIO_SKB_LOCK(skb))
            break;
        ISDN_AUDIO_SKB_LOCK(skb) = 1;
        if ((ISDN_AUDIO_SKB_DLECOUNT(skb)) || (dev->drv[di]->DLEflag & (1 << channel))) {
            char *p = skb->data;
            unsigned long DLEmask = (1 << channel);

            dflag = 0;
            count_pull = count_put = 0;
            while ((count_pull < skb->len) && (len > 0)) {
                /* push every character but the last to the tty buffer directly */
                if (count_put)
                    tty_insert_flip_char(tty, last, TTY_NORMAL);
                len--;
                if (dev->drv[di]->DLEflag & DLEmask) {
                    last = DLE;
                    dev->drv[di]->DLEflag &= ~DLEmask;
                } else {
                    last = *p;
                    if (last == DLE) {
                        dev->drv[di]->DLEflag |= DLEmask;
                        (ISDN_AUDIO_SKB_DLECOUNT(skb))--;
                    }
                    p++;
                    count_pull++;
                }
                count_put++;
            }
            if (count_pull >= skb->len)
                dflag = 1;
        } else {
#endif
            /* No DLE's in buff, so simply copy it */
            dflag = 1;
            if ((count_pull = skb->len) > len) {
                count_pull = len;
                dflag = 0;
            }
            count_put = count_pull;
            if (count_put > 1)
                tty_insert_flip_string(tty, skb->data, count_put - 1);
            last = skb->data[count_put - 1];
            len -= count_put;
#ifdef CONFIG_ISDN_AUDIO
        }
#endif
        count += count_put;
        if (dflag) {
            /* We got all the data in this buff.
             * Now we can dequeue it.
             */
            if (cisco_hack)
                tty_insert_flip_char(tty, last, 0xFF);
            else
                tty_insert_flip_char(tty, last, TTY_NORMAL);
#ifdef CONFIG_ISDN_AUDIO
            ISDN_AUDIO_SKB_LOCK(skb) = 0;
#endif
            skb = skb_dequeue(&dev->drv[di]->rpqueue[channel]);
            dev_kfree_skb(skb);
        } else {
            tty_insert_flip_char(tty, last, TTY_NORMAL);
            /* Not yet emptied this buff, so it
             * must stay in the queue, for further calls
             * but we pull off the data we got until now.
             */
            skb_pull(skb, count_pull);
#ifdef CONFIG_ISDN_AUDIO
            ISDN_AUDIO_SKB_LOCK(skb) = 0;
#endif
        }
        dev->drv[di]->rcvcount[channel] -= count_put;
    }
    return count;
}


static inline int
isdn_minor2drv(int minor)
{
    return (dev->drvmap[minor]);
}

static inline int
isdn_minor2chan(int minor)
{
    return (dev->chanmap[minor]);
}

static char *
isdn_statstr(void)
{
    static char istatbuf[2048];
    char *p;
    int i;

    sprintf(istatbuf, "idmap:\t");
    p = istatbuf + strlen(istatbuf);
    for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
        sprintf(p, "%s ", (dev->drvmap[i] < 0) ? "-" : dev->drvid[dev->drvmap[i]]);
        p = istatbuf + strlen(istatbuf);
    }
    sprintf(p, "\nchmap:\t");
    p = istatbuf + strlen(istatbuf);
    for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
        sprintf(p, "%d ", dev->chanmap[i]);
        p = istatbuf + strlen(istatbuf);
    }
    sprintf(p, "\ndrmap:\t");
    p = istatbuf + strlen(istatbuf);
    for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
        sprintf(p, "%d ", dev->drvmap[i]);
        p = istatbuf + strlen(istatbuf);
    }
    sprintf(p, "\nusage:\t");
    p = istatbuf + strlen(istatbuf);
    for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
        sprintf(p, "%d ", dev->usage[i]);
        p = istatbuf + strlen(istatbuf);
    }
    sprintf(p, "\nflags:\t");
    p = istatbuf + strlen(istatbuf);
    for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
        if (dev->drv[i]) {
            sprintf(p, "%ld ", dev->drv[i]->online);
            p = istatbuf + strlen(istatbuf);
        } else {
            sprintf(p, "? ");
            p = istatbuf + strlen(istatbuf);
        }
    }
    sprintf(p, "\nphone:\t");
    p = istatbuf + strlen(istatbuf);
    for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
        sprintf(p, "%s ", dev->num[i]);
        p = istatbuf + strlen(istatbuf);
    }
    sprintf(p, "\n");
    return istatbuf;
}

/* Module interface-code */

void
isdn_info_update(void)
{
    infostruct *p = dev->infochain;

    while (p) {
        *(p->private) = 1;
        p = (infostruct *) p->next;
    }
    wake_up_interruptible(&(dev->info_waitq));
}

static ssize_t
isdn_read(struct file *file, char __user *buf, size_t count, loff_t *off)
{
    uint minor = iminor(file->f_path.dentry->d_inode);
    int len = 0;
    int drvidx;
    int chidx;
    int retval;
    char *p;

    mutex_lock(&isdn_mutex);
    if (minor == ISDN_MINOR_STATUS) {
        if (!file->private_data) {
            if (file->f_flags & O_NONBLOCK) {
                retval = -EAGAIN;
                goto out;
            }
            interruptible_sleep_on(&(dev->info_waitq));
        }
        p = isdn_statstr();
        file->private_data = NULL;
        if ((len = strlen(p)) <= count) {
            if (copy_to_user(buf, p, len)) {
                retval = -EFAULT;
                goto out;
            }
            *off += len;
            retval = len;
            goto out;
        }
        retval = 0;
        goto out;
    }
    if (!dev->drivers) {
        retval = -ENODEV;
        goto out;
    }
    if (minor <= ISDN_MINOR_BMAX) {
        printk(KERN_WARNING "isdn_read minor %d obsolete!\n", minor);
        drvidx = isdn_minor2drv(minor);
        if (drvidx < 0) {
            retval = -ENODEV;
            goto out;
        }
        if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
            retval = -ENODEV;
            goto out;
        }
        chidx = isdn_minor2chan(minor);
        if (!(p = kmalloc(count, GFP_KERNEL))) {
            retval = -ENOMEM;
            goto out;
        }
        len = isdn_readbchan(drvidx, chidx, p, NULL, count,
                     &dev->drv[drvidx]->rcv_waitq[chidx]);
        *off += len;
        if (copy_to_user(buf, p, len))
            len = -EFAULT;
        kfree(p);
        retval = len;
        goto out;
    }
    if (minor <= ISDN_MINOR_CTRLMAX) {
        drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
        if (drvidx < 0) {
            retval = -ENODEV;
            goto out;
        }
        if (!dev->drv[drvidx]->stavail) {
            if (file->f_flags & O_NONBLOCK) {
                retval = -EAGAIN;
                goto out;
            }
            interruptible_sleep_on(&(dev->drv[drvidx]->st_waitq));
        }
        if (dev->drv[drvidx]->interface->readstat) {
            if (count > dev->drv[drvidx]->stavail)
                count = dev->drv[drvidx]->stavail;
            len = dev->drv[drvidx]->interface->readstat(buf, count,
                                    drvidx, isdn_minor2chan(minor - ISDN_MINOR_CTRL));
            if (len < 0) {
                retval = len;
                goto out;
            }
        } else {
            len = 0;
        }
        if (len)
            dev->drv[drvidx]->stavail -= len;
        else
            dev->drv[drvidx]->stavail = 0;
        *off += len;
        retval = len;
        goto out;
    }
#ifdef CONFIG_ISDN_PPP
    if (minor <= ISDN_MINOR_PPPMAX) {
        retval = isdn_ppp_read(minor - ISDN_MINOR_PPP, file, buf, count);
        goto out;
    }
#endif
    retval = -ENODEV;
out:
    mutex_unlock(&isdn_mutex);
    return retval;
}

static ssize_t
isdn_write(struct file *file, const char __user *buf, size_t count, loff_t *off)
{
    uint minor = iminor(file->f_path.dentry->d_inode);
    int drvidx;
    int chidx;
    int retval;

    if (minor == ISDN_MINOR_STATUS)
        return -EPERM;
    if (!dev->drivers)
        return -ENODEV;

    mutex_lock(&isdn_mutex);
    if (minor <= ISDN_MINOR_BMAX) {
        printk(KERN_WARNING "isdn_write minor %d obsolete!\n", minor);
        drvidx = isdn_minor2drv(minor);
        if (drvidx < 0) {
            retval = -ENODEV;
            goto out;
        }
        if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
            retval = -ENODEV;
            goto out;
        }
        chidx = isdn_minor2chan(minor);
        while ((retval = isdn_writebuf_stub(drvidx, chidx, buf, count)) == 0)
            interruptible_sleep_on(&dev->drv[drvidx]->snd_waitq[chidx]);
        goto out;
    }
    if (minor <= ISDN_MINOR_CTRLMAX) {
        drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
        if (drvidx < 0) {
            retval = -ENODEV;
            goto out;
        }
        /*
         * We want to use the isdnctrl device to load the firmware
         *
         if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
         return -ENODEV;
        */
        if (dev->drv[drvidx]->interface->writecmd)
            retval = dev->drv[drvidx]->interface->
                writecmd(buf, count, drvidx,
                     isdn_minor2chan(minor - ISDN_MINOR_CTRL));
        else
            retval = count;
        goto out;
    }
#ifdef CONFIG_ISDN_PPP
    if (minor <= ISDN_MINOR_PPPMAX) {
        retval = isdn_ppp_write(minor - ISDN_MINOR_PPP, file, buf, count);
        goto out;
    }
#endif
    retval = -ENODEV;
out:
    mutex_unlock(&isdn_mutex);
    return retval;
}

static unsigned int
isdn_poll(struct file *file, poll_table *wait)
{
    unsigned int mask = 0;
    unsigned int minor = iminor(file->f_path.dentry->d_inode);
    int drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);

    mutex_lock(&isdn_mutex);
    if (minor == ISDN_MINOR_STATUS) {
        poll_wait(file, &(dev->info_waitq), wait);
        /* mask = POLLOUT | POLLWRNORM; */
        if (file->private_data) {
            mask |= POLLIN | POLLRDNORM;
        }
        goto out;
    }
    if (minor >= ISDN_MINOR_CTRL && minor <= ISDN_MINOR_CTRLMAX) {
        if (drvidx < 0) {
            /* driver deregistered while file open */
            mask = POLLHUP;
            goto out;
        }
        poll_wait(file, &(dev->drv[drvidx]->st_waitq), wait);
        mask = POLLOUT | POLLWRNORM;
        if (dev->drv[drvidx]->stavail) {
            mask |= POLLIN | POLLRDNORM;
        }
        goto out;
    }
#ifdef CONFIG_ISDN_PPP
    if (minor <= ISDN_MINOR_PPPMAX) {
        mask = isdn_ppp_poll(file, wait);
        goto out;
    }
#endif
    mask = POLLERR;
out:
    mutex_unlock(&isdn_mutex);
    return mask;
}


static int
isdn_ioctl(struct file *file, uint cmd, ulong arg)
{
    uint minor = iminor(file->f_path.dentry->d_inode);
    isdn_ctrl c;
    int drvidx;
    int ret;
    int i;
    char __user *p;
    char *s;
    union iocpar {
        char name[10];
        char bname[22];
        isdn_ioctl_struct iocts;
        isdn_net_ioctl_phone phone;
        isdn_net_ioctl_cfg cfg;
    } iocpar;
    void __user *argp = (void __user *)arg;

#define name  iocpar.name
#define bname iocpar.bname
#define iocts iocpar.iocts
#define phone iocpar.phone
#define cfg   iocpar.cfg

    if (minor == ISDN_MINOR_STATUS) {
        switch (cmd) {
        case IIOCGETDVR:
            return (TTY_DV +
                (NET_DV << 8) +
                (INF_DV << 16));
        case IIOCGETCPS:
            if (arg) {
                ulong __user *p = argp;
                int i;
                if (!access_ok(VERIFY_WRITE, p,
                           sizeof(ulong) * ISDN_MAX_CHANNELS * 2))
                    return -EFAULT;
                for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
                    put_user(dev->ibytes[i], p++);
                    put_user(dev->obytes[i], p++);
                }
                return 0;
            } else
                return -EINVAL;
            break;
        case IIOCNETGPN:
            /* Get peer phone number of a connected
             * isdn network interface */
            if (arg) {
                if (copy_from_user(&phone, argp, sizeof(phone)))
                    return -EFAULT;
                return isdn_net_getpeer(&phone, argp);
            } else
                return -EINVAL;
        default:
            return -EINVAL;
        }
    }
    if (!dev->drivers)
        return -ENODEV;
    if (minor <= ISDN_MINOR_BMAX) {
        drvidx = isdn_minor2drv(minor);
        if (drvidx < 0)
            return -ENODEV;
        if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
            return -ENODEV;
        return 0;
    }
    if (minor <= ISDN_MINOR_CTRLMAX) {
/*
 * isdn net devices manage lots of configuration variables as linked lists.
 * Those lists must only be manipulated from user space. Some of the ioctl's
 * service routines access user space and are not atomic. Therefore, ioctl's
 * manipulating the lists and ioctl's sleeping while accessing the lists
 * are serialized by means of a semaphore.
 */
        switch (cmd) {
        case IIOCNETDWRSET:
            printk(KERN_INFO "INFO: ISDN_DW_ABC_EXTENSION not enabled\n");
            return (-EINVAL);
        case IIOCNETLCR:
            printk(KERN_INFO "INFO: ISDN_ABC_LCR_SUPPORT not enabled\n");
            return -ENODEV;
        case IIOCNETAIF:
            /* Add a network-interface */
            if (arg) {
                if (copy_from_user(name, argp, sizeof(name)))
                    return -EFAULT;
                s = name;
            } else {
                s = NULL;
            }
            ret = mutex_lock_interruptible(&dev->mtx);
            if (ret) return ret;
            if ((s = isdn_net_new(s, NULL))) {
                if (copy_to_user(argp, s, strlen(s) + 1)) {
                    ret = -EFAULT;
                } else {
                    ret = 0;
                }
            } else
                ret = -ENODEV;
            mutex_unlock(&dev->mtx);
            return ret;
        case IIOCNETASL:
            /* Add a slave to a network-interface */
            if (arg) {
                if (copy_from_user(bname, argp, sizeof(bname) - 1))
                    return -EFAULT;
            } else
                return -EINVAL;
            ret = mutex_lock_interruptible(&dev->mtx);
            if (ret) return ret;
            if ((s = isdn_net_newslave(bname))) {
                if (copy_to_user(argp, s, strlen(s) + 1)) {
                    ret = -EFAULT;
                } else {
                    ret = 0;
                }
            } else
                ret = -ENODEV;
            mutex_unlock(&dev->mtx);
            return ret;
        case IIOCNETDIF:
            /* Delete a network-interface */
            if (arg) {
                if (copy_from_user(name, argp, sizeof(name)))
                    return -EFAULT;
                ret = mutex_lock_interruptible(&dev->mtx);
                if (ret) return ret;
                ret = isdn_net_rm(name);
                mutex_unlock(&dev->mtx);
                return ret;
            } else
                return -EINVAL;
        case IIOCNETSCF:
            /* Set configurable parameters of a network-interface */
            if (arg) {
                if (copy_from_user(&cfg, argp, sizeof(cfg)))
                    return -EFAULT;
                return isdn_net_setcfg(&cfg);
            } else
                return -EINVAL;
        case IIOCNETGCF:
            /* Get configurable parameters of a network-interface */
            if (arg) {
                if (copy_from_user(&cfg, argp, sizeof(cfg)))
                    return -EFAULT;
                if (!(ret = isdn_net_getcfg(&cfg))) {
                    if (copy_to_user(argp, &cfg, sizeof(cfg)))
                        return -EFAULT;
                }
                return ret;
            } else
                return -EINVAL;
        case IIOCNETANM:
            /* Add a phone-number to a network-interface */
            if (arg) {
                if (copy_from_user(&phone, argp, sizeof(phone)))
                    return -EFAULT;
                ret = mutex_lock_interruptible(&dev->mtx);
                if (ret) return ret;
                ret = isdn_net_addphone(&phone);
                mutex_unlock(&dev->mtx);
                return ret;
            } else
                return -EINVAL;
        case IIOCNETGNM:
            /* Get list of phone-numbers of a network-interface */
            if (arg) {
                if (copy_from_user(&phone, argp, sizeof(phone)))
                    return -EFAULT;
                ret = mutex_lock_interruptible(&dev->mtx);
                if (ret) return ret;
                ret = isdn_net_getphones(&phone, argp);
                mutex_unlock(&dev->mtx);
                return ret;
            } else
                return -EINVAL;
        case IIOCNETDNM:
            /* Delete a phone-number of a network-interface */
            if (arg) {
                if (copy_from_user(&phone, argp, sizeof(phone)))
                    return -EFAULT;
                ret = mutex_lock_interruptible(&dev->mtx);
                if (ret) return ret;
                ret = isdn_net_delphone(&phone);
                mutex_unlock(&dev->mtx);
                return ret;
            } else
                return -EINVAL;
        case IIOCNETDIL:
            /* Force dialing of a network-interface */
            if (arg) {
                if (copy_from_user(name, argp, sizeof(name)))
                    return -EFAULT;
                return isdn_net_force_dial(name);
            } else
                return -EINVAL;
#ifdef CONFIG_ISDN_PPP
        case IIOCNETALN:
            if (!arg)
                return -EINVAL;
            if (copy_from_user(name, argp, sizeof(name)))
                return -EFAULT;
            return isdn_ppp_dial_slave(name);
        case IIOCNETDLN:
            if (!arg)
                return -EINVAL;
            if (copy_from_user(name, argp, sizeof(name)))
                return -EFAULT;
            return isdn_ppp_hangup_slave(name);
#endif
        case IIOCNETHUP:
            /* Force hangup of a network-interface */
            if (!arg)
                return -EINVAL;
            if (copy_from_user(name, argp, sizeof(name)))
                return -EFAULT;
            return isdn_net_force_hangup(name);
            break;
        case IIOCSETVER:
            dev->net_verbose = arg;
            printk(KERN_INFO "isdn: Verbose-Level is %d\n", dev->net_verbose);
            return 0;
        case IIOCSETGST:
            if (arg)
                dev->global_flags |= ISDN_GLOBAL_STOPPED;
            else
                dev->global_flags &= ~ISDN_GLOBAL_STOPPED;
            printk(KERN_INFO "isdn: Global Mode %s\n",
                   (dev->global_flags & ISDN_GLOBAL_STOPPED) ? "stopped" : "running");
            return 0;
        case IIOCSETBRJ:
            drvidx = -1;
            if (arg) {
                int i;
                char *p;
                if (copy_from_user(&iocts, argp,
                           sizeof(isdn_ioctl_struct)))
                    return -EFAULT;
                iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
                if (strlen(iocts.drvid)) {
                    if ((p = strchr(iocts.drvid, ',')))
                        *p = 0;
                    drvidx = -1;
                    for (i = 0; i < ISDN_MAX_DRIVERS; i++)
                        if (!(strcmp(dev->drvid[i], iocts.drvid))) {
                            drvidx = i;
                            break;
                        }
                }
            }
            if (drvidx == -1)
                return -ENODEV;
            if (iocts.arg)
                dev->drv[drvidx]->flags |= DRV_FLAG_REJBUS;
            else
                dev->drv[drvidx]->flags &= ~DRV_FLAG_REJBUS;
            return 0;
        case IIOCSIGPRF:
            dev->profd = current;
            return 0;
            break;
        case IIOCGETPRF:
            /* Get all Modem-Profiles */
            if (arg) {
                char __user *p = argp;
                int i;

                if (!access_ok(VERIFY_WRITE, argp,
                           (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
                           * ISDN_MAX_CHANNELS))
                    return -EFAULT;

                for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
                    if (copy_to_user(p, dev->mdm.info[i].emu.profile,
                             ISDN_MODEM_NUMREG))
                        return -EFAULT;
                    p += ISDN_MODEM_NUMREG;
                    if (copy_to_user(p, dev->mdm.info[i].emu.pmsn, ISDN_MSNLEN))
                        return -EFAULT;
                    p += ISDN_MSNLEN;
                    if (copy_to_user(p, dev->mdm.info[i].emu.plmsn, ISDN_LMSNLEN))
                        return -EFAULT;
                    p += ISDN_LMSNLEN;
                }
                return (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN) * ISDN_MAX_CHANNELS;
            } else
                return -EINVAL;
            break;
        case IIOCSETPRF:
            /* Set all Modem-Profiles */
            if (arg) {
                char __user *p = argp;
                int i;

                if (!access_ok(VERIFY_READ, argp,
                           (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
                           * ISDN_MAX_CHANNELS))
                    return -EFAULT;

                for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
                    if (copy_from_user(dev->mdm.info[i].emu.profile, p,
                               ISDN_MODEM_NUMREG))
                        return -EFAULT;
                    p += ISDN_MODEM_NUMREG;
                    if (copy_from_user(dev->mdm.info[i].emu.plmsn, p, ISDN_LMSNLEN))
                        return -EFAULT;
                    p += ISDN_LMSNLEN;
                    if (copy_from_user(dev->mdm.info[i].emu.pmsn, p, ISDN_MSNLEN))
                        return -EFAULT;
                    p += ISDN_MSNLEN;
                }
                return 0;
            } else
                return -EINVAL;
            break;
        case IIOCSETMAP:
        case IIOCGETMAP:
            /* Set/Get MSN->EAZ-Mapping for a driver */
            if (arg) {

                if (copy_from_user(&iocts, argp,
                           sizeof(isdn_ioctl_struct)))
                    return -EFAULT;
                iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
                if (strlen(iocts.drvid)) {
                    drvidx = -1;
                    for (i = 0; i < ISDN_MAX_DRIVERS; i++)
                        if (!(strcmp(dev->drvid[i], iocts.drvid))) {
                            drvidx = i;
                            break;
                        }
                } else
                    drvidx = 0;
                if (drvidx == -1)
                    return -ENODEV;
                if (cmd == IIOCSETMAP) {
                    int loop = 1;

                    p = (char __user *) iocts.arg;
                    i = 0;
                    while (loop) {
                        int j = 0;

                        while (1) {
                            if (!access_ok(VERIFY_READ, p, 1))
                                return -EFAULT;
                            get_user(bname[j], p++);
                            switch (bname[j]) {
                            case '\0':
                                loop = 0;
                                /* Fall through */
                            case ',':
                                bname[j] = '\0';
                                strcpy(dev->drv[drvidx]->msn2eaz[i], bname);
                                j = ISDN_MSNLEN;
                                break;
                            default:
                                j++;
                            }
                            if (j >= ISDN_MSNLEN)
                                break;
                        }
                        if (++i > 9)
                            break;
                    }
                } else {
                    p = (char __user *) iocts.arg;
                    for (i = 0; i < 10; i++) {
                        snprintf(bname, sizeof(bname), "%s%s",
                             strlen(dev->drv[drvidx]->msn2eaz[i]) ?
                             dev->drv[drvidx]->msn2eaz[i] : "_",
                             (i < 9) ? "," : "\0");
                        if (copy_to_user(p, bname, strlen(bname) + 1))
                            return -EFAULT;
                        p += strlen(bname);
                    }
                }
                return 0;
            } else
                return -EINVAL;
        case IIOCDBGVAR:
            if (arg) {
                if (copy_to_user(argp, &dev, sizeof(ulong)))
                    return -EFAULT;
                return 0;
            } else
                return -EINVAL;
            break;
        default:
            if ((cmd & IIOCDRVCTL) == IIOCDRVCTL)
                cmd = ((cmd >> _IOC_NRSHIFT) & _IOC_NRMASK) & ISDN_DRVIOCTL_MASK;
            else
                return -EINVAL;
            if (arg) {
                int i;
                char *p;
                if (copy_from_user(&iocts, argp, sizeof(isdn_ioctl_struct)))
                    return -EFAULT;
                iocts.drvid[sizeof(iocts.drvid) - 1] = 0;
                if (strlen(iocts.drvid)) {
                    if ((p = strchr(iocts.drvid, ',')))
                        *p = 0;
                    drvidx = -1;
                    for (i = 0; i < ISDN_MAX_DRIVERS; i++)
                        if (!(strcmp(dev->drvid[i], iocts.drvid))) {
                            drvidx = i;
                            break;
                        }
                } else
                    drvidx = 0;
                if (drvidx == -1)
                    return -ENODEV;
                if (!access_ok(VERIFY_WRITE, argp,
                           sizeof(isdn_ioctl_struct)))
                    return -EFAULT;
                c.driver = drvidx;
                c.command = ISDN_CMD_IOCTL;
                c.arg = cmd;
                memcpy(c.parm.num, &iocts.arg, sizeof(ulong));
                ret = isdn_command(&c);
                memcpy(&iocts.arg, c.parm.num, sizeof(ulong));
                if (copy_to_user(argp, &iocts, sizeof(isdn_ioctl_struct)))
                    return -EFAULT;
                return ret;
            } else
                return -EINVAL;
        }
    }
#ifdef CONFIG_ISDN_PPP
    if (minor <= ISDN_MINOR_PPPMAX)
        return (isdn_ppp_ioctl(minor - ISDN_MINOR_PPP, file, cmd, arg));
#endif
    return -ENODEV;

#undef name
#undef bname
#undef iocts
#undef phone
#undef cfg
}

static long
isdn_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
    int ret;

    mutex_lock(&isdn_mutex);
    ret = isdn_ioctl(file, cmd, arg);
    mutex_unlock(&isdn_mutex);

    return ret;
}

/*
 * Open the device code.
 */
static int
isdn_open(struct inode *ino, struct file *filep)
{
    uint minor = iminor(ino);
    int drvidx;
    int chidx;
    int retval = -ENODEV;

    mutex_lock(&isdn_mutex);
    if (minor == ISDN_MINOR_STATUS) {
        infostruct *p;

        if ((p = kmalloc(sizeof(infostruct), GFP_KERNEL))) {
            p->next = (char *) dev->infochain;
            p->private = (char *) &(filep->private_data);
            dev->infochain = p;
            /* At opening we allow a single update */
            filep->private_data = (char *) 1;
            retval = 0;
            goto out;
        } else {
            retval = -ENOMEM;
            goto out;
        }
    }
    if (!dev->channels)
        goto out;
    if (minor <= ISDN_MINOR_BMAX) {
        printk(KERN_WARNING "isdn_open minor %d obsolete!\n", minor);
        drvidx = isdn_minor2drv(minor);
        if (drvidx < 0)
            goto out;
        chidx = isdn_minor2chan(minor);
        if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
            goto out;
        if (!(dev->drv[drvidx]->online & (1 << chidx)))
            goto out;
        isdn_lock_drivers();
        retval = 0;
        goto out;
    }
    if (minor <= ISDN_MINOR_CTRLMAX) {
        drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
        if (drvidx < 0)
            goto out;
        isdn_lock_drivers();
        retval = 0;
        goto out;
    }
#ifdef CONFIG_ISDN_PPP
    if (minor <= ISDN_MINOR_PPPMAX) {
        retval = isdn_ppp_open(minor - ISDN_MINOR_PPP, filep);
        if (retval == 0)
            isdn_lock_drivers();
        goto out;
    }
#endif
out:
    nonseekable_open(ino, filep);
    mutex_unlock(&isdn_mutex);
    return retval;
}

static int
isdn_close(struct inode *ino, struct file *filep)
{
    uint minor = iminor(ino);

    mutex_lock(&isdn_mutex);
    if (minor == ISDN_MINOR_STATUS) {
        infostruct *p = dev->infochain;
        infostruct *q = NULL;

        while (p) {
            if (p->private == (char *) &(filep->private_data)) {
                if (q)
                    q->next = p->next;
                else
                    dev->infochain = (infostruct *) (p->next);
                kfree(p);
                goto out;
            }
            q = p;
            p = (infostruct *) (p->next);
        }
        printk(KERN_WARNING "isdn: No private data while closing isdnctrl\n");
        goto out;
    }
    isdn_unlock_drivers();
    if (minor <= ISDN_MINOR_BMAX)
        goto out;
    if (minor <= ISDN_MINOR_CTRLMAX) {
        if (dev->profd == current)
            dev->profd = NULL;
        goto out;
    }
#ifdef CONFIG_ISDN_PPP
    if (minor <= ISDN_MINOR_PPPMAX)
        isdn_ppp_release(minor - ISDN_MINOR_PPP, filep);
#endif

out:
    mutex_unlock(&isdn_mutex);
    return 0;
}

static const struct file_operations isdn_fops =
{
    .owner      = THIS_MODULE,
    .llseek     = no_llseek,
    .read       = isdn_read,
    .write      = isdn_write,
    .poll       = isdn_poll,
    .unlocked_ioctl = isdn_unlocked_ioctl,
    .open       = isdn_open,
    .release    = isdn_close,
};

char *
isdn_map_eaz2msn(char *msn, int di)
{
    isdn_driver_t *this = dev->drv[di];
    int i;

    if (strlen(msn) == 1) {
        i = msn[0] - '0';
        if ((i >= 0) && (i <= 9))
            if (strlen(this->msn2eaz[i]))
                return (this->msn2eaz[i]);
    }
    return (msn);
}

/*
 * Find an unused ISDN-channel, whose feature-flags match the
 * given L2- and L3-protocols.
 */
#define L2V (~(ISDN_FEATURE_L2_V11096 | ISDN_FEATURE_L2_V11019 | ISDN_FEATURE_L2_V11038))

/*
 * This function must be called with holding the dev->lock.
 */
int
isdn_get_free_channel(int usage, int l2_proto, int l3_proto, int pre_dev
              , int pre_chan, char *msn)
{
    int i;
    ulong features;
    ulong vfeatures;

    features = ((1 << l2_proto) | (0x10000 << l3_proto));
    vfeatures = (((1 << l2_proto) | (0x10000 << l3_proto)) &
             ~(ISDN_FEATURE_L2_V11096 | ISDN_FEATURE_L2_V11019 | ISDN_FEATURE_L2_V11038));
    /* If Layer-2 protocol is V.110, accept drivers with
     * transparent feature even if these don't support V.110
     * because we can emulate this in linklevel.
     */
    for (i = 0; i < ISDN_MAX_CHANNELS; i++)
        if (USG_NONE(dev->usage[i]) &&
            (dev->drvmap[i] != -1)) {
            int d = dev->drvmap[i];
            if ((dev->usage[i] & ISDN_USAGE_EXCLUSIVE) &&
                ((pre_dev != d) || (pre_chan != dev->chanmap[i])))
                continue;
            if (!strcmp(isdn_map_eaz2msn(msn, d), "-"))
                continue;
            if (dev->usage[i] & ISDN_USAGE_DISABLED)
                continue; /* usage not allowed */
            if (dev->drv[d]->flags & DRV_FLAG_RUNNING) {
                if (((dev->drv[d]->interface->features & features) == features) ||
                    (((dev->drv[d]->interface->features & vfeatures) == vfeatures) &&
                     (dev->drv[d]->interface->features & ISDN_FEATURE_L2_TRANS))) {
                    if ((pre_dev < 0) || (pre_chan < 0)) {
                        dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
                        dev->usage[i] |= usage;
                        isdn_info_update();
                        return i;
                    } else {
                        if ((pre_dev == d) && (pre_chan == dev->chanmap[i])) {
                            dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
                            dev->usage[i] |= usage;
                            isdn_info_update();
                            return i;
                        }
                    }
                }
            }
        }
    return -1;
}

/*
 * Set state of ISDN-channel to 'unused'
 */
void
isdn_free_channel(int di, int ch, int usage)
{
    int i;

    if ((di < 0) || (ch < 0)) {
        printk(KERN_WARNING "%s: called with invalid drv(%d) or channel(%d)\n",
               __func__, di, ch);
        return;
    }
    for (i = 0; i < ISDN_MAX_CHANNELS; i++)
        if (((!usage) || ((dev->usage[i] & ISDN_USAGE_MASK) == usage)) &&
            (dev->drvmap[i] == di) &&
            (dev->chanmap[i] == ch)) {
            dev->usage[i] &= (ISDN_USAGE_NONE | ISDN_USAGE_EXCLUSIVE);
            strcpy(dev->num[i], "???");
            dev->ibytes[i] = 0;
            dev->obytes[i] = 0;
// 20.10.99 JIM, try to reinitialize v110 !
            dev->v110emu[i] = 0;
            atomic_set(&(dev->v110use[i]), 0);
            isdn_v110_close(dev->v110[i]);
            dev->v110[i] = NULL;
// 20.10.99 JIM, try to reinitialize v110 !
            isdn_info_update();
            if (dev->drv[di])
                skb_queue_purge(&dev->drv[di]->rpqueue[ch]);
        }
}

/*
 * Cancel Exclusive-Flag for ISDN-channel
 */
void
isdn_unexclusive_channel(int di, int ch)
{
    int i;

    for (i = 0; i < ISDN_MAX_CHANNELS; i++)
        if ((dev->drvmap[i] == di) &&
            (dev->chanmap[i] == ch)) {
            dev->usage[i] &= ~ISDN_USAGE_EXCLUSIVE;
            isdn_info_update();
            return;
        }
}

/*
 *  writebuf replacement for SKB_ABLE drivers
 */
static int
isdn_writebuf_stub(int drvidx, int chan, const u_char __user *buf, int len)
{
    int ret;
    int hl = dev->drv[drvidx]->interface->hl_hdrlen;
    struct sk_buff *skb = alloc_skb(hl + len, GFP_ATOMIC);

    if (!skb)
        return -ENOMEM;
    skb_reserve(skb, hl);
    if (copy_from_user(skb_put(skb, len), buf, len)) {
        dev_kfree_skb(skb);
        return -EFAULT;
    }
    ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, 1, skb);
    if (ret <= 0)
        dev_kfree_skb(skb);
    if (ret > 0)
        dev->obytes[isdn_dc2minor(drvidx, chan)] += ret;
    return ret;
}

/*
 * Return: length of data on success, -ERRcode on failure.
 */
int
isdn_writebuf_skb_stub(int drvidx, int chan, int ack, struct sk_buff *skb)
{
    int ret;
    struct sk_buff *nskb = NULL;
    int v110_ret = skb->len;
    int idx = isdn_dc2minor(drvidx, chan);

    if (dev->v110[idx]) {
        atomic_inc(&dev->v110use[idx]);
        nskb = isdn_v110_encode(dev->v110[idx], skb);
        atomic_dec(&dev->v110use[idx]);
        if (!nskb)
            return 0;
        v110_ret = *((int *)nskb->data);
        skb_pull(nskb, sizeof(int));
        if (!nskb->len) {
            dev_kfree_skb(nskb);
            return v110_ret;
        }
        /* V.110 must always be acknowledged */
        ack = 1;
        ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, nskb);
    } else {
        int hl = dev->drv[drvidx]->interface->hl_hdrlen;

        if (skb_headroom(skb) < hl) {
            /*
             * This should only occur when new HL driver with
             * increased hl_hdrlen was loaded after netdevice
             * was created and connected to the new driver.
             *
             * The V.110 branch (re-allocates on its own) does
             * not need this
             */
            struct sk_buff *skb_tmp;

            skb_tmp = skb_realloc_headroom(skb, hl);
            printk(KERN_DEBUG "isdn_writebuf_skb_stub: reallocating headroom%s\n", skb_tmp ? "" : " failed");
            if (!skb_tmp) return -ENOMEM; /* 0 better? */
            ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb_tmp);
            if (ret > 0) {
                dev_kfree_skb(skb);
            } else {
                dev_kfree_skb(skb_tmp);
            }
        } else {
            ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb);
        }
    }
    if (ret > 0) {
        dev->obytes[idx] += ret;
        if (dev->v110[idx]) {
            atomic_inc(&dev->v110use[idx]);
            dev->v110[idx]->skbuser++;
            atomic_dec(&dev->v110use[idx]);
            /* For V.110 return unencoded data length */
            ret = v110_ret;
            /* if the complete frame was send we free the skb;
               if not upper function will requeue the skb */
            if (ret == skb->len)
                dev_kfree_skb(skb);
        }
    } else
        if (dev->v110[idx])
            dev_kfree_skb(nskb);
    return ret;
}

static int
isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding)
{
    int j, k, m;

    init_waitqueue_head(&d->st_waitq);
    if (d->flags & DRV_FLAG_RUNNING)
        return -1;
    if (n < 1) return 0;

    m = (adding) ? d->channels + n : n;

    if (dev->channels + n > ISDN_MAX_CHANNELS) {
        printk(KERN_WARNING "register_isdn: Max. %d channels supported\n",
               ISDN_MAX_CHANNELS);
        return -1;
    }

    if ((adding) && (d->rcverr))
        kfree(d->rcverr);
    if (!(d->rcverr = kzalloc(sizeof(int) * m, GFP_ATOMIC))) {
        printk(KERN_WARNING "register_isdn: Could not alloc rcverr\n");
        return -1;
    }

    if ((adding) && (d->rcvcount))
        kfree(d->rcvcount);
    if (!(d->rcvcount = kzalloc(sizeof(int) * m, GFP_ATOMIC))) {
        printk(KERN_WARNING "register_isdn: Could not alloc rcvcount\n");
        if (!adding)
            kfree(d->rcverr);
        return -1;
    }

    if ((adding) && (d->rpqueue)) {
        for (j = 0; j < d->channels; j++)
            skb_queue_purge(&d->rpqueue[j]);
        kfree(d->rpqueue);
    }
    if (!(d->rpqueue = kmalloc(sizeof(struct sk_buff_head) * m, GFP_ATOMIC))) {
        printk(KERN_WARNING "register_isdn: Could not alloc rpqueue\n");
        if (!adding) {
            kfree(d->rcvcount);
            kfree(d->rcverr);
        }
        return -1;
    }
    for (j = 0; j < m; j++) {
        skb_queue_head_init(&d->rpqueue[j]);
    }

    if ((adding) && (d->rcv_waitq))
        kfree(d->rcv_waitq);
    d->rcv_waitq = kmalloc(sizeof(wait_queue_head_t) * 2 * m, GFP_ATOMIC);
    if (!d->rcv_waitq) {
        printk(KERN_WARNING "register_isdn: Could not alloc rcv_waitq\n");
        if (!adding) {
            kfree(d->rpqueue);
            kfree(d->rcvcount);
            kfree(d->rcverr);
        }
        return -1;
    }
    d->snd_waitq = d->rcv_waitq + m;
    for (j = 0; j < m; j++) {
        init_waitqueue_head(&d->rcv_waitq[j]);
        init_waitqueue_head(&d->snd_waitq[j]);
    }

    dev->channels += n;
    for (j = d->channels; j < m; j++)
        for (k = 0; k < ISDN_MAX_CHANNELS; k++)
            if (dev->chanmap[k] < 0) {
                dev->chanmap[k] = j;
                dev->drvmap[k] = drvidx;
                break;
            }
    d->channels = m;
    return 0;
}

/*
 * Low-level-driver registration
 */

static void
set_global_features(void)
{
    int drvidx;

    dev->global_features = 0;
    for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++) {
        if (!dev->drv[drvidx])
            continue;
        if (dev->drv[drvidx]->interface)
            dev->global_features |= dev->drv[drvidx]->interface->features;
    }
}

#ifdef CONFIG_ISDN_DIVERSION

static char *map_drvname(int di)
{
    if ((di < 0) || (di >= ISDN_MAX_DRIVERS))
        return (NULL);
    return (dev->drvid[di]); /* driver name */
} /* map_drvname */

static int map_namedrv(char *id)
{  int i;

    for (i = 0; i < ISDN_MAX_DRIVERS; i++)
    { if (!strcmp(dev->drvid[i], id))
            return (i);
    }
    return (-1);
} /* map_namedrv */

int DIVERT_REG_NAME(isdn_divert_if *i_div)
{
    if (i_div->if_magic != DIVERT_IF_MAGIC)
        return (DIVERT_VER_ERR);
    switch (i_div->cmd)
    {
    case DIVERT_CMD_REL:
        if (divert_if != i_div)
            return (DIVERT_REL_ERR);
        divert_if = NULL; /* free interface */
        return (DIVERT_NO_ERR);

    case DIVERT_CMD_REG:
        if (divert_if)
            return (DIVERT_REG_ERR);
        i_div->ll_cmd = isdn_command; /* set command function */
        i_div->drv_to_name = map_drvname;
        i_div->name_to_drv = map_namedrv;
        divert_if = i_div; /* remember interface */
        return (DIVERT_NO_ERR);

    default:
        return (DIVERT_CMD_ERR);
    }
} /* DIVERT_REG_NAME */

EXPORT_SYMBOL(DIVERT_REG_NAME);

#endif /* CONFIG_ISDN_DIVERSION */


EXPORT_SYMBOL(register_isdn);
#ifdef CONFIG_ISDN_PPP
EXPORT_SYMBOL(isdn_ppp_register_compressor);
EXPORT_SYMBOL(isdn_ppp_unregister_compressor);
#endif

int
register_isdn(isdn_if *i)
{
    isdn_driver_t *d;
    int j;
    ulong flags;
    int drvidx;

    if (dev->drivers >= ISDN_MAX_DRIVERS) {
        printk(KERN_WARNING "register_isdn: Max. %d drivers supported\n",
               ISDN_MAX_DRIVERS);
        return 0;
    }
    if (!i->writebuf_skb) {
        printk(KERN_WARNING "register_isdn: No write routine given.\n");
        return 0;
    }
    if (!(d = kzalloc(sizeof(isdn_driver_t), GFP_KERNEL))) {
        printk(KERN_WARNING "register_isdn: Could not alloc driver-struct\n");
        return 0;
    }

    d->maxbufsize = i->maxbufsize;
    d->pktcount = 0;
    d->stavail = 0;
    d->flags = DRV_FLAG_LOADED;
    d->online = 0;
    d->interface = i;
    d->channels = 0;
    spin_lock_irqsave(&dev->lock, flags);
    for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++)
        if (!dev->drv[drvidx])
            break;
    if (isdn_add_channels(d, drvidx, i->channels, 0)) {
        spin_unlock_irqrestore(&dev->lock, flags);
        kfree(d);
        return 0;
    }
    i->channels = drvidx;
    i->rcvcallb_skb = isdn_receive_skb_callback;
    i->statcallb = isdn_status_callback;
    if (!strlen(i->id))
        sprintf(i->id, "line%d", drvidx);
    for (j = 0; j < drvidx; j++)
        if (!strcmp(i->id, dev->drvid[j]))
            sprintf(i->id, "line%d", drvidx);
    dev->drv[drvidx] = d;
    strcpy(dev->drvid[drvidx], i->id);
    isdn_info_update();
    dev->drivers++;
    set_global_features();
    spin_unlock_irqrestore(&dev->lock, flags);
    return 1;
}

/*
*****************************************************************************
* And now the modules code.
*****************************************************************************
*/

static char *
isdn_getrev(const char *revision)
{
    char *rev;
    char *p;

    if ((p = strchr(revision, ':'))) {
        rev = p + 2;
        p = strchr(rev, '$');
        *--p = 0;
    } else
        rev = "???";
    return rev;
}

/*
 * Allocate and initialize all data, register modem-devices
 */
static int __init isdn_init(void)
{
    int i;
    char tmprev[50];

    dev = vzalloc(sizeof(isdn_dev));
    if (!dev) {
        printk(KERN_WARNING "isdn: Could not allocate device-struct.\n");
        return -EIO;
    }
    init_timer(&dev->timer);
    dev->timer.function = isdn_timer_funct;
    spin_lock_init(&dev->lock);
    spin_lock_init(&dev->timerlock);
#ifdef MODULE
    dev->owner = THIS_MODULE;
#endif
    mutex_init(&dev->mtx);
    init_waitqueue_head(&dev->info_waitq);
    for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
        dev->drvmap[i] = -1;
        dev->chanmap[i] = -1;
        dev->m_idx[i] = -1;
        strcpy(dev->num[i], "???");
    }
    if (register_chrdev(ISDN_MAJOR, "isdn", &isdn_fops)) {
        printk(KERN_WARNING "isdn: Could not register control devices\n");
        vfree(dev);
        return -EIO;
    }
    if ((isdn_tty_modem_init()) < 0) {
        printk(KERN_WARNING "isdn: Could not register tty devices\n");
        vfree(dev);
        unregister_chrdev(ISDN_MAJOR, "isdn");
        return -EIO;
    }
#ifdef CONFIG_ISDN_PPP
    if (isdn_ppp_init() < 0) {
        printk(KERN_WARNING "isdn: Could not create PPP-device-structs\n");
        isdn_tty_exit();
        unregister_chrdev(ISDN_MAJOR, "isdn");
        vfree(dev);
        return -EIO;
    }
#endif                          /* CONFIG_ISDN_PPP */

    strcpy(tmprev, isdn_revision);
    printk(KERN_NOTICE "ISDN subsystem Rev: %s/", isdn_getrev(tmprev));
    strcpy(tmprev, isdn_net_revision);
    printk("%s/", isdn_getrev(tmprev));
    strcpy(tmprev, isdn_ppp_revision);
    printk("%s/", isdn_getrev(tmprev));
    strcpy(tmprev, isdn_audio_revision);
    printk("%s/", isdn_getrev(tmprev));
    strcpy(tmprev, isdn_v110_revision);
    printk("%s", isdn_getrev(tmprev));

#ifdef MODULE
    printk(" loaded\n");
#else
    printk("\n");
#endif
    isdn_info_update();
    return 0;
}

/*
 * Unload module
 */
static void __exit isdn_exit(void)
{
#ifdef CONFIG_ISDN_PPP
    isdn_ppp_cleanup();
#endif
    if (isdn_net_rmall() < 0) {
        printk(KERN_WARNING "isdn: net-device busy, remove cancelled\n");
        return;
    }
    isdn_tty_exit();
    unregister_chrdev(ISDN_MAJOR, "isdn");
    del_timer(&dev->timer);
    /* call vfree with interrupts enabled, else it will hang */
    vfree(dev);
    printk(KERN_NOTICE "ISDN-subsystem unloaded\n");
}

module_init(isdn_init);
module_exit(isdn_exit);