/* $Id: idifunc.c,v 1.14.4.4 2004/08/28 20:03:53 armin Exp $
 *
 * Driver for Eicon DIVA Server ISDN cards.
 * User Mode IDI Interface
 *
 * Copyright 2000-2003 by Armin Schindler (mac@melware.de)
 * Copyright 2000-2003 Cytronics & Melware (info@melware.de)
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 */

#include "platform.h"
#include "di_defs.h"
#include "divasync.h"
#include "um_xdi.h"
#include "um_idi.h"

#define DBG_MINIMUM  (DL_LOG + DL_FTL + DL_ERR)
#define DBG_DEFAULT  (DBG_MINIMUM + DL_XLOG + DL_REG)

extern char *DRIVERRELEASE_IDI;

extern void DIVA_DIDD_Read(void *, int);
extern int diva_user_mode_idi_create_adapter(const DESCRIPTOR *, int);
extern void diva_user_mode_idi_remove_adapter(int);

static dword notify_handle;
static DESCRIPTOR DAdapter;
static DESCRIPTOR MAdapter;

static void no_printf(unsigned char *x, ...)
{
        /* dummy debug function */
}

#include "debuglib.c"

/*
 * stop debug
 */
static void stop_dbg(void)
{
        DbgDeregister();
        memset(&MAdapter, 0, sizeof(MAdapter));
        dprintf = no_printf;
}

typedef struct _udiva_card {
        struct list_head list;
        int Id;
        DESCRIPTOR d;
} udiva_card;

static LIST_HEAD(cards);
static diva_os_spin_lock_t ll_lock;

/*
 * find card in list
 */
static udiva_card *find_card_in_list(DESCRIPTOR *d)
{
        udiva_card *card;
        struct list_head *tmp;
        diva_os_spin_lock_magic_t old_irql;

        diva_os_enter_spin_lock(&ll_lock, &old_irql, "find card");
        list_for_each(tmp, &cards) {
                card = list_entry(tmp, udiva_card, list);
                if (card->d.request == d->request) {
                        diva_os_leave_spin_lock(&ll_lock, &old_irql,
                                                "find card");
                        return (card);
                }
        }
        diva_os_leave_spin_lock(&ll_lock, &old_irql, "find card");
        return ((udiva_card *) NULL);
}

/*
 * new card
 */
static void um_new_card(DESCRIPTOR *d)
{
        int adapter_nr = 0;
        udiva_card *card = NULL;
        IDI_SYNC_REQ sync_req;
        diva_os_spin_lock_magic_t old_irql;

        if (!(card = diva_os_malloc(0, sizeof(udiva_card)))) {
                DBG_ERR(("cannot get buffer for card"));
                return;
        }
        memcpy(&card->d, d, sizeof(DESCRIPTOR));
        sync_req.xdi_logical_adapter_number.Req = 0;
        sync_req.xdi_logical_adapter_number.Rc =
                IDI_SYNC_REQ_XDI_GET_LOGICAL_ADAPTER_NUMBER;
        card->d.request((ENTITY *)&sync_req);
        adapter_nr =
                sync_req.xdi_logical_adapter_number.info.logical_adapter_number;
        card->Id = adapter_nr;
        if (!(diva_user_mode_idi_create_adapter(d, adapter_nr))) {
                diva_os_enter_spin_lock(&ll_lock, &old_irql, "add card");
                list_add_tail(&card->list, &cards);
                diva_os_leave_spin_lock(&ll_lock, &old_irql, "add card");
        } else {
                DBG_ERR(("could not create user mode idi card %d",
                         adapter_nr));
                diva_os_free(0, card);
        }
}

/*
 * remove card
 */
static void um_remove_card(DESCRIPTOR *d)
{
        diva_os_spin_lock_magic_t old_irql;
        udiva_card *card = NULL;

        if (!(card = find_card_in_list(d))) {
                DBG_ERR(("cannot find card to remove"));
                return;
        }
        diva_user_mode_idi_remove_adapter(card->Id);
        diva_os_enter_spin_lock(&ll_lock, &old_irql, "remove card");
        list_del(&card->list);
        diva_os_leave_spin_lock(&ll_lock, &old_irql, "remove card");
        DBG_LOG(("idi proc entry removed for card %d", card->Id));
        diva_os_free(0, card);
}

/*
 * remove all adapter
 */
static void __exit remove_all_idi_proc(void)
{
        udiva_card *card;
        diva_os_spin_lock_magic_t old_irql;

rescan:
        diva_os_enter_spin_lock(&ll_lock, &old_irql, "remove all");
        if (!list_empty(&cards)) {
                card = list_entry(cards.next, udiva_card, list);
                list_del(&card->list);
                diva_os_leave_spin_lock(&ll_lock, &old_irql, "remove all");
                diva_user_mode_idi_remove_adapter(card->Id);
                diva_os_free(0, card);
                goto rescan;
        }
        diva_os_leave_spin_lock(&ll_lock, &old_irql, "remove all");
}

/*
 * DIDD notify callback
 */
static void *didd_callback(void *context, DESCRIPTOR *adapter,
                           int removal)
{
        if (adapter->type == IDI_DADAPTER) {
                DBG_ERR(("Notification about IDI_DADAPTER change ! Oops."));
                return (NULL);
        } else if (adapter->type == IDI_DIMAINT) {
                if (removal) {
                        stop_dbg();
                } else {
                        memcpy(&MAdapter, adapter, sizeof(MAdapter));
                        dprintf = (DIVA_DI_PRINTF) MAdapter.request;
                        DbgRegister("User IDI", DRIVERRELEASE_IDI, DBG_DEFAULT);
                }
        } else if ((adapter->type > 0) && (adapter->type < 16)) {       /* IDI Adapter */
                if (removal) {
                        um_remove_card(adapter);
                } else {
                        um_new_card(adapter);
                }
        }
        return (NULL);
}

/*
 * connect DIDD
 */
static int __init connect_didd(void)
{
        int x = 0;
        int dadapter = 0;
        IDI_SYNC_REQ req;
        DESCRIPTOR DIDD_Table[MAX_DESCRIPTORS];

        DIVA_DIDD_Read(DIDD_Table, sizeof(DIDD_Table));

        for (x = 0; x < MAX_DESCRIPTORS; x++) {
                if (DIDD_Table[x].type == IDI_DADAPTER) {       /* DADAPTER found */
                        dadapter = 1;
                        memcpy(&DAdapter, &DIDD_Table[x], sizeof(DAdapter));
                        req.didd_notify.e.Req = 0;
                        req.didd_notify.e.Rc =
                                IDI_SYNC_REQ_DIDD_REGISTER_ADAPTER_NOTIFY;
                        req.didd_notify.info.callback = (void *)didd_callback;
                        req.didd_notify.info.context = NULL;
                        DAdapter.request((ENTITY *)&req);
                        if (req.didd_notify.e.Rc != 0xff) {
                                stop_dbg();
                                return (0);
                        }
                        notify_handle = req.didd_notify.info.handle;
                } else if (DIDD_Table[x].type == IDI_DIMAINT) { /* MAINT found */
                        memcpy(&MAdapter, &DIDD_Table[x], sizeof(DAdapter));
                        dprintf = (DIVA_DI_PRINTF) MAdapter.request;
                        DbgRegister("User IDI", DRIVERRELEASE_IDI, DBG_DEFAULT);
                } else if ((DIDD_Table[x].type > 0)
                           && (DIDD_Table[x].type < 16)) {      /* IDI Adapter found */
                        um_new_card(&DIDD_Table[x]);
                }
        }

        if (!dadapter) {
                stop_dbg();
        }

        return (dadapter);
}

/*
 *  Disconnect from DIDD
 */
static void __exit disconnect_didd(void)
{
        IDI_SYNC_REQ req;

        stop_dbg();

        req.didd_notify.e.Req = 0;
        req.didd_notify.e.Rc = IDI_SYNC_REQ_DIDD_REMOVE_ADAPTER_NOTIFY;
        req.didd_notify.info.handle = notify_handle;
        DAdapter.request((ENTITY *)&req);
}

/*
 * init
 */
int __init idifunc_init(void)
{
        diva_os_initialize_spin_lock(&ll_lock, "idifunc");

        if (diva_user_mode_idi_init()) {
                DBG_ERR(("init: init failed."));
                return (0);
        }

        if (!connect_didd()) {
                diva_user_mode_idi_finit();
                DBG_ERR(("init: failed to connect to DIDD."));
                return (0);
        }
        return (1);
}

/*
 * finit
 */
void __exit idifunc_finit(void)
{
        diva_user_mode_idi_finit();
        disconnect_didd();
        remove_all_idi_proc();
}