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zr36120.c

/*
    zr36120.c - Zoran 36120/36125 based framegrabbers

    Copyright (C) 1998-1999 Pauline Middelink <middelin@polyware.nl>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/signal.h>
#include <linux/wait.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <linux/sched.h>
#include <linux/video_decoder.h>

#include <asm/uaccess.h>

#include "tuner.h"
#include "zr36120.h"
#include "zr36120_mem.h"

/* mark an required function argument unused - lintism */
#define     UNUSED(x)   (void)(x)

/* sensible default */
#ifndef CARDTYPE
#define CARDTYPE 0
#endif

/* Anybody who uses more than four? */
#define ZORAN_MAX 4

static unsigned int triton1=0;                  /* triton1 chipset? */
static unsigned int cardtype[ZORAN_MAX]={ [ 0 ... ZORAN_MAX-1 ] = CARDTYPE };
static int video_nr = -1;
static int vbi_nr = -1;

static struct pci_device_id zr36120_pci_tbl[] = {
      { PCI_VENDOR_ID_ZORAN,PCI_DEVICE_ID_ZORAN_36120,
        PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
      { 0 }
};
MODULE_DEVICE_TABLE(pci, zr36120_pci_tbl);

MODULE_AUTHOR("Pauline Middelink <middelin@polyware.nl>");
MODULE_DESCRIPTION("Zoran ZR36120 based framegrabber");
MODULE_LICENSE("GPL");

module_param(triton1, uint, 0);
module_param_array(cardtype, uint, NULL, 0);
module_param(video_nr, int, 0);
module_param(vbi_nr, int, 0);

static int zoran_cards;
static struct zoran zorans[ZORAN_MAX];

/*
 * the meaning of each element can be found in zr36120.h
 * Determining the value of gpdir/gpval can be tricky. The
 * best way is to run the card under the original software
 * and read the values from the general purpose registers
 * 0x28 and 0x2C. How you do that is left as an exercise
 * to the impatient reader :)
 */
#define T 1 /* to separate the bools from the ints */
#define F 0
static struct tvcard tvcards[] = {
      /* reported working by <middelin@polyware.nl> */
/*0*/ { "Trust Victor II",
        2, 0, T, T, T, T, 0x7F, 0x80, { 1, SVHS(6) }, { 0 } },
      /* reported working by <Michael.Paxton@aihw.gov.au>  */
/*1*/   { "Aitech WaveWatcher TV-PCI",
        3, 0, T, F, T, T, 0x7F, 0x80, { 1, TUNER(3), SVHS(6) }, { 0 } },
      /* reported working by ? */
/*2*/ { "Genius Video Wonder PCI Video Capture Card",
        2, 0, T, T, T, T, 0x7F, 0x80, { 1, SVHS(6) }, { 0 } },
      /* reported working by <Pascal.Gabriel@wanadoo.fr> */
/*3*/ { "Guillemot Maxi-TV PCI",
        2, 0, T, T, T, T, 0x7F, 0x80, { 1, SVHS(6) }, { 0 } },
      /* reported working by "Craig Whitmore <lennon@igrin.co.nz> */
/*4*/ { "Quadrant Buster",
        3, 3, T, F, T, T, 0x7F, 0x80, { SVHS(1), TUNER(2), 3 }, { 1, 2, 3 } },
      /* a debug entry which has all inputs mapped */
/*5*/ { "ZR36120 based framegrabber (all inputs enabled)",
        6, 0, T, T, T, T, 0x7F, 0x80, { 1, 2, 3, 4, 5, 6 }, { 0 } }
};
#undef T
#undef F
#define NRTVCARDS (sizeof(tvcards)/sizeof(tvcards[0]))

#ifdef __sparc__
#define     ENDIANESS   0
#else
#define     ENDIANESS   ZORAN_VFEC_LE
#endif

static struct { const char name[8]; uint mode; uint bpp; } palette2fmt[] = {
/* n/a     */     { "n/a",     0, 0 },
/* GREY    */     { "GRAY",    0, 0 },
/* HI240   */     { "HI240",   0, 0 },
/* RGB565  */     { "RGB565",  ZORAN_VFEC_RGB_RGB565|ENDIANESS, 2 },
/* RGB24   */     { "RGB24",   ZORAN_VFEC_RGB_RGB888|ENDIANESS|ZORAN_VFEC_PACK24, 3 },
/* RGB32   */     { "RGB32",   ZORAN_VFEC_RGB_RGB888|ENDIANESS, 4 },
/* RGB555  */     { "RGB555",  ZORAN_VFEC_RGB_RGB555|ENDIANESS, 2 },
/* YUV422  */     { "YUV422",  ZORAN_VFEC_RGB_YUV422|ENDIANESS, 2 },
/* YUYV    */     { "YUYV",    0, 0 },
/* UYVY    */     { "UYVY",    0, 0 },
/* YUV420  */     { "YUV420",  0, 0 },
/* YUV411  */     { "YUV411",  0, 0 },
/* RAW     */     { "RAW",     0, 0 },
/* YUV422P */     { "YUV422P", 0, 0 },
/* YUV411P */     { "YUV411P", 0, 0 }};
#define NRPALETTES (sizeof(palette2fmt)/sizeof(palette2fmt[0]))
#undef ENDIANESS

/* ----------------------------------------------------------------------- */
/* ZORAN chipset detector                                                 */
/* shamelessly stolen from bttv.c                                         */
/* Reason for beeing here: we need to detect if we are running on a        */
/* Triton based chipset, and if so, enable a certain bit                   */
/* ----------------------------------------------------------------------- */
static
void __init handle_chipset(void)
{
      /* Just in case some nut set this to something dangerous */
      if (triton1)
            triton1 = ZORAN_VDC_TRICOM;

      if (pci_pci_problems & PCIPCI_TRITON) {
            printk(KERN_INFO "zoran: Host bridge 82437FX Triton PIIX\n");
            triton1 = ZORAN_VDC_TRICOM;
      }
}

/* ----------------------------------------------------------------------- */
/* ZORAN functions                                             */
/* ----------------------------------------------------------------------- */

static void zoran_set_geo(struct zoran* ztv, struct vidinfo* i);

#if 0 /* unused */
static
void zoran_dump(struct zoran *ztv)
{
      char  str[256];
      char  *p=str; /* shut up, gcc! */
      int   i;

      for (i=0; i<0x60; i+=4) {
            if ((i % 16) == 0) {
                  if (i) printk("%s\n",str);
                  p = str;
                  p+= sprintf(str, KERN_DEBUG "       %04x: ",i);
            }
            p += sprintf(p, "%08x ",zrread(i));
      }
}
#endif /* unused */

static
void reap_states(struct zoran* ztv)
{
      /* count frames */
      ztv->fieldnr++;

      /*
       * Are we busy at all?
       * This depends on if there is a workqueue AND the
       * videotransfer is enabled on the chip...
       */
      if (ztv->workqueue && (zrread(ZORAN_VDC) & ZORAN_VDC_VIDEN))
      {
            struct vidinfo* newitem;

            /* did we get a complete frame? */
            if (zrread(ZORAN_VSTR) & ZORAN_VSTR_GRAB)
                  return;

DEBUG(printk(CARD_DEBUG "completed %s at %p\n",CARD,ztv->workqueue->kindof==FBUFFER_GRAB?"grab":"read",ztv->workqueue));

            /* we are done with this buffer, tell everyone */
            ztv->workqueue->status = FBUFFER_DONE;
            ztv->workqueue->fieldnr = ztv->fieldnr;
            /* not good, here for BTTV_FIELDNR reasons */
            ztv->lastfieldnr = ztv->fieldnr;

            switch (ztv->workqueue->kindof) {
             case FBUFFER_GRAB:
                  wake_up_interruptible(&ztv->grabq);
                  break;
             case FBUFFER_VBI:
                  wake_up_interruptible(&ztv->vbiq);
                  break;
             default:
                  printk(CARD_INFO "somebody killed the workqueue (kindof=%d)!\n",CARD,ztv->workqueue->kindof);
            }

            /* item completed, skip to next item in queue */
            write_lock(&ztv->lock);
            newitem = ztv->workqueue->next;
            ztv->workqueue->next = 0;     /* mark completed */
            ztv->workqueue = newitem;
            write_unlock(&ztv->lock);
      }

      /*
       * ok, so it seems we have nothing in progress right now.
       * Lets see if we can find some work.
       */
      if (ztv->workqueue)
      {
            struct vidinfo* newitem;
again:

DEBUG(printk(CARD_DEBUG "starting %s at %p\n",CARD,ztv->workqueue->kindof==FBUFFER_GRAB?"grab":"read",ztv->workqueue));

            /* loadup the frame settings */
            read_lock(&ztv->lock);
            zoran_set_geo(ztv,ztv->workqueue);
            read_unlock(&ztv->lock);

            switch (ztv->workqueue->kindof) {
             case FBUFFER_GRAB:
             case FBUFFER_VBI:
                  zrand(~ZORAN_OCR_OVLEN, ZORAN_OCR);
                  zror(ZORAN_VSTR_SNAPSHOT,ZORAN_VSTR);
                  zror(ZORAN_VDC_VIDEN,ZORAN_VDC);

                  /* start single-shot grab */
                  zror(ZORAN_VSTR_GRAB, ZORAN_VSTR);
                  break;
             default:
                  printk(CARD_INFO "what is this doing on the queue? (kindof=%d)\n",CARD,ztv->workqueue->kindof);
                  write_lock(&ztv->lock);
                  newitem = ztv->workqueue->next;
                  ztv->workqueue->next = 0;
                  ztv->workqueue = newitem;
                  write_unlock(&ztv->lock);
                  if (newitem)
                        goto again; /* yeah, sure.. */
            }
            /* bye for now */
            return;
      }
DEBUG(printk(CARD_DEBUG "nothing in queue\n",CARD));

      /*
       * What? Even the workqueue is empty? Am i really here
       * for nothing? Did i come all that way to... do nothing?
       */

      /* do we need to overlay? */
      if (test_bit(STATE_OVERLAY, &ztv->state))
      {
            /* are we already overlaying? */
            if (!(zrread(ZORAN_OCR) & ZORAN_OCR_OVLEN) ||
                !(zrread(ZORAN_VDC) & ZORAN_VDC_VIDEN))
            {
DEBUG(printk(CARD_DEBUG "starting overlay\n",CARD));

                  read_lock(&ztv->lock);
                  zoran_set_geo(ztv,&ztv->overinfo);
                  read_unlock(&ztv->lock);

                  zror(ZORAN_OCR_OVLEN, ZORAN_OCR);
                  zrand(~ZORAN_VSTR_SNAPSHOT,ZORAN_VSTR);
                  zror(ZORAN_VDC_VIDEN,ZORAN_VDC);
            }

            /*
             * leave overlaying on, but turn interrupts off.
             */
            zrand(~ZORAN_ICR_EN,ZORAN_ICR);
            return;
      }

      /* do we have any VBI idle time processing? */
      if (test_bit(STATE_VBI, &ztv->state))
      {
            struct vidinfo* item;
            struct vidinfo* lastitem;

            /* protect the workqueue */
            write_lock(&ztv->lock);
            lastitem = ztv->workqueue;
            if (lastitem)
                  while (lastitem->next) lastitem = lastitem->next;
            for (item=ztv->readinfo; item!=ztv->readinfo+ZORAN_VBI_BUFFERS; item++)
                  if (item->next == 0 && item->status == FBUFFER_FREE)
                  {
DEBUG(printk(CARD_DEBUG "%p added to queue\n",CARD,item));
                        item->status = FBUFFER_BUSY;
                        if (!lastitem)
                              ztv->workqueue = item;
                        else
                              lastitem->next = item;
                        lastitem = item;
                  }
            write_unlock(&ztv->lock);
            if (ztv->workqueue)
                  goto again; /* hey, _i_ graduated :) */
      }

      /*
       * Then we must be realy IDLE
       */
DEBUG(printk(CARD_DEBUG "turning off\n",CARD));
      /* nothing further to do, disable DMA and further IRQs */
      zrand(~ZORAN_VDC_VIDEN,ZORAN_VDC);
      zrand(~ZORAN_ICR_EN,ZORAN_ICR);
}

static
void zoran_irq(int irq, void *dev_id, struct pt_regs * regs)
{
      u32 stat,estat;
      int count = 0;
      struct zoran *ztv = dev_id;

      UNUSED(irq); UNUSED(regs);
      for (;;) {
            /* get/clear interrupt status bits */
            stat=zrread(ZORAN_ISR);
            estat=stat & zrread(ZORAN_ICR);
            if (!estat)
                  return;
            zrwrite(estat,ZORAN_ISR);
            IDEBUG(printk(CARD_DEBUG "estat %08x\n",CARD,estat));
            IDEBUG(printk(CARD_DEBUG " stat %08x\n",CARD,stat));

            if (estat & ZORAN_ISR_CODE)
            {
                  IDEBUG(printk(CARD_DEBUG "CodReplIRQ\n",CARD));
            }
            if (estat & ZORAN_ISR_GIRQ0)
            {
                  IDEBUG(printk(CARD_DEBUG "GIRQ0\n",CARD));
                  if (!ztv->card->usegirq1)
                        reap_states(ztv);
            }
            if (estat & ZORAN_ISR_GIRQ1)
            {
                  IDEBUG(printk(CARD_DEBUG "GIRQ1\n",CARD));
                  if (ztv->card->usegirq1)
                        reap_states(ztv);
            }

            count++;
            if (count > 10)
                  printk(CARD_ERR "irq loop %d (%x)\n",CARD,count,estat);
            if (count > 20)
            {
                  zrwrite(0, ZORAN_ICR);
                  printk(CARD_ERR "IRQ lockup, cleared int mask\n",CARD);
            }
      }
}

static
int zoran_muxsel(struct zoran* ztv, int channel, int norm)
{
      int   rv;

      /* set the new video norm */
      rv = i2c_control_device(&(ztv->i2c), I2C_DRIVERID_VIDEODECODER, DECODER_SET_NORM, &norm);
      if (rv)
            return rv;
      ztv->norm = norm;

      /* map the given channel to the cards decoder's channel */
      channel = ztv->card->video_mux[channel] & CHANNEL_MASK;

      /* set the new channel */
      rv = i2c_control_device(&(ztv->i2c), I2C_DRIVERID_VIDEODECODER, DECODER_SET_INPUT, &channel);
      return rv;
}

/* Tell the interrupt handler what to to.  */
static
void zoran_cap(struct zoran* ztv, int on)
{
DEBUG(printk(CARD_DEBUG "zoran_cap(%d) state=%x\n",CARD,on,ztv->state));

      if (on) {
            ztv->running = 1;

            /*
             * turn interrupts (back) on. The DMA will be enabled
             * inside the irq handler when it detects a restart.
             */
            zror(ZORAN_ICR_EN,ZORAN_ICR);
      }
      else {
            /*
             * turn both interrupts and DMA off
             */
            zrand(~ZORAN_VDC_VIDEN,ZORAN_VDC);
            zrand(~ZORAN_ICR_EN,ZORAN_ICR);

            ztv->running = 0;
      }
}

static ulong dmask[] = {
      0xFFFFFFFF, 0xFFFFFFFE, 0xFFFFFFFC, 0xFFFFFFF8,
      0xFFFFFFF0, 0xFFFFFFE0, 0xFFFFFFC0, 0xFFFFFF80,
      0xFFFFFF00, 0xFFFFFE00, 0xFFFFFC00, 0xFFFFF800,
      0xFFFFF000, 0xFFFFE000, 0xFFFFC000, 0xFFFF8000,
      0xFFFF0000, 0xFFFE0000, 0xFFFC0000, 0xFFF80000,
      0xFFF00000, 0xFFE00000, 0xFFC00000, 0xFF800000,
      0xFF000000, 0xFE000000, 0xFC000000, 0xF8000000,
      0xF0000000, 0xE0000000, 0xC0000000, 0x80000000
};

static
void zoran_built_overlay(struct zoran* ztv, int count, struct video_clip *vcp)
{
      ulong*      mtop;
      int   ystep = (ztv->vidXshift + ztv->vidWidth+31)/32; /* next DWORD */
      int   i;

DEBUG(printk(KERN_DEBUG "       overlay at %p, ystep=%d, clips=%d\n",ztv->overinfo.overlay,ystep,count));

      for (i=0; i<count; i++) {
            struct video_clip *vp = vcp+i;
            UNUSED(vp);
DEBUG(printk(KERN_DEBUG "       %d: clip(%d,%d,%d,%d)\n", i,vp->x,vp->y,vp->width,vp->height));
      }

      /*
       * activate the visible portion of the screen
       * Note we take some shortcuts here, because we
       * know the width can never be < 32. (I.e. a DWORD)
       * We also assume the overlay starts somewhere in
       * the FIRST dword.
       */
      {
            int start = ztv->vidXshift;
            ulong firstd = dmask[start];
            ulong lastd = ~dmask[(start + ztv->overinfo.w) & 31];
            mtop = ztv->overinfo.overlay;
            for (i=0; i<ztv->overinfo.h; i++) {
                  int w = ztv->vidWidth;
                  ulong* line = mtop;
                  if (start & 31) {
                        *line++ = firstd;
                        w -= 32-(start&31);
                  }
                  memset(line, ~0, w/8);
                  if (w & 31)
                        line[w/32] = lastd;
                  mtop += ystep;
            }
      }

      /* process clipping regions */
      for (i=0; i<count; i++) {
            int h;
            if (vcp->x < 0 || (uint)vcp->x > ztv->overinfo.w ||
                vcp->y < 0 || vcp->y > ztv->overinfo.h ||
                vcp->width < 0 || (uint)(vcp->x+vcp->width) > ztv->overinfo.w ||
                vcp->height < 0 || (vcp->y+vcp->height) > ztv->overinfo.h)
            {
                  DEBUG(printk(CARD_DEBUG "invalid clipzone (%d,%d,%d,%d) not in (0,0,%d,%d), adapting\n",CARD,vcp->x,vcp->y,vcp->width,vcp->height,ztv->overinfo.w,ztv->overinfo.h));
                  if (vcp->x < 0) vcp->x = 0;
                  if ((uint)vcp->x > ztv->overinfo.w) vcp->x = ztv->overinfo.w;
                  if (vcp->y < 0) vcp->y = 0;
                  if (vcp->y > ztv->overinfo.h) vcp->y = ztv->overinfo.h;
                  if (vcp->width < 0) vcp->width = 0;
                  if ((uint)(vcp->x+vcp->width) > ztv->overinfo.w) vcp->width = ztv->overinfo.w - vcp->x;
                  if (vcp->height < 0) vcp->height = 0;
                  if (vcp->y+vcp->height > ztv->overinfo.h) vcp->height = ztv->overinfo.h - vcp->y;
//                continue;
            }

            mtop = &ztv->overinfo.overlay[vcp->y*ystep];
            for (h=0; h<=vcp->height; h++) {
                  int w;
                  int x = ztv->vidXshift + vcp->x;
                  for (w=0; w<=vcp->width; w++) {
                        clear_bit(x&31, &mtop[x/32]);
                        x++;
                  }
                  mtop += ystep;
            }
            ++vcp;
      }

      mtop = ztv->overinfo.overlay;
      zrwrite(virt_to_bus(mtop), ZORAN_MTOP);
      zrwrite(virt_to_bus(mtop+ystep), ZORAN_MBOT);
      zraor((ztv->vidInterlace*ystep)<<0,~ZORAN_OCR_MASKSTRIDE,ZORAN_OCR);
}

struct tvnorm
{
      u16 Wt, Wa, Ht, Ha, HStart, VStart;
};

static struct tvnorm tvnorms[] = {
      /* PAL-BDGHI */
/*    { 864, 720, 625, 576, 131, 21 },*/
/*00*/      { 864, 768, 625, 576, 81, 17 },
      /* NTSC */
/*01*/      { 858, 720, 525, 480, 121, 10 },
      /* SECAM */
/*02*/      { 864, 720, 625, 576, 131, 21 },
      /* BW50 */
/*03*/      { 864, 720, 625, 576, 131, 21 },
      /* BW60 */
/*04*/      { 858, 720, 525, 480, 121, 10 }
};
#define TVNORMS (sizeof(tvnorms)/sizeof(tvnorm))

/*
 * Program the chip for a setup as described in the vidinfo struct.
 *
 * Side-effects: calculates vidXshift, vidInterlace,
 * vidHeight, vidWidth which are used in a later stage
 * to calculate the overlay mask
 *
 * This is an internal function, as such it does not check the
 * validity of the struct members... Spectaculair crashes will
 * follow /very/ quick when you're wrong and the chip right :)
 */
static
void zoran_set_geo(struct zoran* ztv, struct vidinfo* i)
{
      ulong top, bot;
      int   stride;
      int   winWidth, winHeight;
      int   maxWidth, maxHeight, maxXOffset, maxYOffset;
      long  vfec;

DEBUG(printk(CARD_DEBUG "set_geo(rect=(%d,%d,%d,%d), norm=%d, format=%d, bpp=%d, bpl=%d, busadr=%lx, overlay=%p)\n",CARD,i->x,i->y,i->w,i->h,ztv->norm,i->format,i->bpp,i->bpl,i->busadr,i->overlay));

      /*
       * make sure the DMA transfers are inhibited during our
       * reprogramming of the chip
       */
      zrand(~ZORAN_VDC_VIDEN,ZORAN_VDC);

      maxWidth = tvnorms[ztv->norm].Wa;
      maxHeight = tvnorms[ztv->norm].Ha/2;
      maxXOffset = tvnorms[ztv->norm].HStart;
      maxYOffset = tvnorms[ztv->norm].VStart;

      /* setup vfec register (keep ExtFl,TopField and VCLKPol settings) */
      vfec = (zrread(ZORAN_VFEC) & (ZORAN_VFEC_EXTFL|ZORAN_VFEC_TOPFIELD|ZORAN_VFEC_VCLKPOL)) |
             (palette2fmt[i->format].mode & (ZORAN_VFEC_RGB|ZORAN_VFEC_ERRDIF|ZORAN_VFEC_LE|ZORAN_VFEC_PACK24));

      /*
       * Set top, bottom ptrs. Since these must be DWORD aligned,
       * possible adjust the x and the width of the window.
       * so the endposition stay the same. The vidXshift will make
       * sure we are not writing pixels before the requested x.
       */
      ztv->vidXshift = 0;
      winWidth = i->w;
      if (winWidth < 0)
            winWidth = -winWidth;
      top = i->busadr + i->x*i->bpp + i->y*i->bpl;
      if (top & 3) {
            ztv->vidXshift = (top & 3) / i->bpp;
            winWidth += ztv->vidXshift;
            DEBUG(printk(KERN_DEBUG "       window-x shifted %d pixels left\n",ztv->vidXshift));
            top &= ~3;
      }

      /*
       * bottom points to next frame but in interleaved mode we want
       * to 'mix' the 2 frames to one capture, so 'bot' points to one
       * (physical) line below the top line.
       */
      bot = top + i->bpl;
      zrwrite(top,ZORAN_VTOP);
      zrwrite(bot,ZORAN_VBOT);

      /*
       * Make sure the winWidth is DWORD aligned too,
       * thereby automaticly making sure the stride to the
       * next line is DWORD aligned too (as required by spec).
       */
      if ((winWidth*i->bpp) & 3) {
DEBUG(printk(KERN_DEBUG "       window-width enlarged by %d pixels\n",(winWidth*i->bpp) & 3));
            winWidth += (winWidth*i->bpp) & 3;
      }

      /* determine the DispMode and stride */
      if (i->h >= 0 && i->h <= maxHeight) {
            /* single frame grab suffices for this height. */
            vfec |= ZORAN_VFEC_DISPMOD;
            ztv->vidInterlace = 0;
            stride = i->bpl - (winWidth*i->bpp);
            winHeight = i->h;
      }
      else {
            /* interleaving needed for this height */
            ztv->vidInterlace = 1;
            stride = i->bpl*2 - (winWidth*i->bpp);
            winHeight = i->h/2;
      }
      if (winHeight < 0)      /* can happen for VBI! */
            winHeight = -winHeight;

      /* safety net, sometimes bpl is too short??? */
      if (stride<0) {
DEBUG(printk(CARD_DEBUG "WARNING stride = %d\n",CARD,stride));
            stride = 0;
      }

      zraor((winHeight<<12)|(winWidth<<0),~(ZORAN_VDC_VIDWINHT|ZORAN_VDC_VIDWINWID), ZORAN_VDC);
      zraor(stride<<16,~ZORAN_VSTR_DISPSTRIDE,ZORAN_VSTR);

      /* remember vidWidth, vidHeight for overlay calculations */
      ztv->vidWidth = winWidth;
      ztv->vidHeight = winHeight;
DEBUG(printk(KERN_DEBUG "       top=%08lx, bottom=%08lx\n",top,bot));
DEBUG(printk(KERN_DEBUG "       winWidth=%d, winHeight=%d\n",winWidth,winHeight));
DEBUG(printk(KERN_DEBUG "       maxWidth=%d, maxHeight=%d\n",maxWidth,maxHeight));
DEBUG(printk(KERN_DEBUG "       stride=%d\n",stride));

      /*
       * determine horizontal scales and crops
       */
      if (i->w < 0) {
            int Hstart = 1;
            int Hend = Hstart + winWidth;
DEBUG(printk(KERN_DEBUG "       Y: scale=0, start=%d, end=%d\n", Hstart, Hend));
            zraor((Hstart<<10)|(Hend<<0),~(ZORAN_VFEH_HSTART|ZORAN_VFEH_HEND),ZORAN_VFEH);
      }
      else {
            int Wa = maxWidth;
            int X = (winWidth*64+Wa-1)/Wa;
            int We = winWidth*64/X;
            int HorDcm = 64-X;
            int hcrop1 = 2*(Wa-We)/4;
            /*
             * BUGFIX: Juha Nurmela <junki@qn-lpr2-165.quicknet.inet.fi>
             * found the solution to the color phase shift.
             * See ChangeLog for the full explanation)
             */
            int Hstart = (maxXOffset + hcrop1) | 1;
            int Hend = Hstart + We - 1;

DEBUG(printk(KERN_DEBUG "       X: scale=%d, start=%d, end=%d\n", HorDcm, Hstart, Hend));

            zraor((Hstart<<10)|(Hend<<0),~(ZORAN_VFEH_HSTART|ZORAN_VFEH_HEND),ZORAN_VFEH);
            vfec |= HorDcm<<14;

            if (HorDcm<16)
                  vfec |= ZORAN_VFEC_HFILTER_1; /* no filter */
            else if (HorDcm<32)
                  vfec |= ZORAN_VFEC_HFILTER_3; /* 3 tap filter */
            else if (HorDcm<48)
                  vfec |= ZORAN_VFEC_HFILTER_4; /* 4 tap filter */
            else  vfec |= ZORAN_VFEC_HFILTER_5; /* 5 tap filter */
      }

      /*
       * Determine vertical scales and crops
       *
       * when height is negative, we want to read starting at line 0
       * One day someone might need access to these lines...
       */
      if (i->h < 0) {
            int Vstart = 0;
            int Vend = Vstart + winHeight;
DEBUG(printk(KERN_DEBUG "       Y: scale=0, start=%d, end=%d\n", Vstart, Vend));
            zraor((Vstart<<10)|(Vend<<0),~(ZORAN_VFEV_VSTART|ZORAN_VFEV_VEND),ZORAN_VFEV);
      }
      else {
            int Ha = maxHeight;
            int Y = (winHeight*64+Ha-1)/Ha;
            int He = winHeight*64/Y;
            int VerDcm = 64-Y;
            int vcrop1 = 2*(Ha-He)/4;
            int Vstart = maxYOffset + vcrop1;
            int Vend = Vstart + He - 1;

DEBUG(printk(KERN_DEBUG "       Y: scale=%d, start=%d, end=%d\n", VerDcm, Vstart, Vend));
            zraor((Vstart<<10)|(Vend<<0),~(ZORAN_VFEV_VSTART|ZORAN_VFEV_VEND),ZORAN_VFEV);
            vfec |= VerDcm<<8;
      }

DEBUG(printk(KERN_DEBUG "       F: format=%d(=%s)\n",i->format,palette2fmt[i->format].name));

      /* setup the requested format */
      zrwrite(vfec, ZORAN_VFEC);
}

static
void zoran_common_open(struct zoran* ztv, int flags)
{
      UNUSED(flags);

      /* already opened? */
      if (ztv->users++ != 0)
            return;

      /* unmute audio */
      /* /what/ audio? */

      ztv->state = 0;

      /* setup the encoder to the initial values */
      ztv->picture.colour=254<<7;
      ztv->picture.brightness=128<<8;
      ztv->picture.hue=128<<8;
      ztv->picture.contrast=216<<7;
      i2c_control_device(&ztv->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_PICTURE, &ztv->picture);

      /* default to the composite input since my camera is there */
      zoran_muxsel(ztv, 0, VIDEO_MODE_PAL);
}

static
void zoran_common_close(struct zoran* ztv)
{
      if (--ztv->users != 0)
            return;

      /* mute audio */
      /* /what/ audio? */

      /* stop the chip */
      zoran_cap(ztv, 0);
}

/*
 * Open a zoran card. Right now the flags are just a hack
 */
static int zoran_open(struct video_device *dev, int flags)
{
      struct zoran *ztv = (struct zoran*)dev;
      struct vidinfo* item;
      char* pos;

      DEBUG(printk(CARD_DEBUG "open(dev,%d)\n",CARD,flags));

      /*********************************************
       * We really should be doing lazy allocing...
       *********************************************/
      /* allocate a frame buffer */
      if (!ztv->fbuffer)
            ztv->fbuffer = bmalloc(ZORAN_MAX_FBUFSIZE);
      if (!ztv->fbuffer) {
            /* could not get a buffer, bail out */
            return -ENOBUFS;
      }
      /* at this time we _always_ have a framebuffer */
      memset(ztv->fbuffer,0,ZORAN_MAX_FBUFSIZE);

      if (!ztv->overinfo.overlay)
            ztv->overinfo.overlay = kmalloc(1024*1024/8, GFP_KERNEL);
      if (!ztv->overinfo.overlay) {
            /* could not get an overlay buffer, bail out */
            bfree(ztv->fbuffer, ZORAN_MAX_FBUFSIZE);
            return -ENOBUFS;
      }
      /* at this time we _always_ have a overlay */

      /* clear buffer status, and give them a DMAable address */
      pos = ztv->fbuffer;
      for (item=ztv->grabinfo; item!=ztv->grabinfo+ZORAN_MAX_FBUFFERS; item++)
      {
            item->status = FBUFFER_FREE;
            item->memadr = pos;
            item->busadr = virt_to_bus(pos);
            pos += ZORAN_MAX_FBUFFER;
      }

      /* do the common part of all open's */
      zoran_common_open(ztv, flags);

      return 0;
}

static
void zoran_close(struct video_device* dev)
{
      struct zoran *ztv = (struct zoran*)dev;

      DEBUG(printk(CARD_DEBUG "close(dev)\n",CARD));

      /* driver specific closure */
      clear_bit(STATE_OVERLAY, &ztv->state);

      zoran_common_close(ztv);

      /*
       *      This is sucky but right now I can't find a good way to
       *      be sure its safe to free the buffer. We wait 5-6 fields
       *      which is more than sufficient to be sure.
       */
      msleep(100);                  /* Wait 1/10th of a second */

      /* free the allocated framebuffer */
      bfree(ztv->fbuffer, ZORAN_MAX_FBUFSIZE);
      ztv->fbuffer = 0;
      kfree(ztv->overinfo.overlay);
      ztv->overinfo.overlay = 0;

}

/*
 * This read function could be used reentrant in a SMP situation.
 *
 * This is made possible by the spinlock which is kept till we
 * found and marked a buffer for our own use. The lock must
 * be released as soon as possible to prevent lock contention.
 */
static
long zoran_read(struct video_device* dev, char* buf, unsigned long count, int nonblock)
{
      struct zoran *ztv = (struct zoran*)dev;
      unsigned long max;
      struct vidinfo* unused = 0;
      struct vidinfo* done = 0;

      DEBUG(printk(CARD_DEBUG "zoran_read(%p,%ld,%d)\n",CARD,buf,count,nonblock));

      /* find ourself a free or completed buffer */
      for (;;) {
            struct vidinfo* item;

            write_lock_irq(&ztv->lock);
            for (item=ztv->grabinfo; item!=ztv->grabinfo+ZORAN_MAX_FBUFFERS; item++)
            {
                  if (!unused && item->status == FBUFFER_FREE)
                        unused = item;
                  if (!done && item->status == FBUFFER_DONE)
                        done = item;
            }
            if (done || unused)
                  break;

            /* no more free buffers, wait for them. */
            write_unlock_irq(&ztv->lock);
            if (nonblock)
                  return -EWOULDBLOCK;
            interruptible_sleep_on(&ztv->grabq);
            if (signal_pending(current))
                  return -EINTR;
      }

      /* Do we have 'ready' data? */
      if (!done) {
            /* no? than this will take a while... */
            if (nonblock) {
                  write_unlock_irq(&ztv->lock);
                  return -EWOULDBLOCK;
            }

            /* mark the unused buffer as wanted */
            unused->status = FBUFFER_BUSY;
            unused->w = 320;
            unused->h = 240;
            unused->format = VIDEO_PALETTE_RGB24;
            unused->bpp = palette2fmt[unused->format].bpp;
            unused->bpl = unused->w * unused->bpp;
            unused->next = 0;
            { /* add to tail of queue */
              struct vidinfo* oldframe = ztv->workqueue;
              if (!oldframe) ztv->workqueue = unused;
              else {
                while (oldframe->next) oldframe = oldframe->next;
                oldframe->next = unused;
              }
            }
            write_unlock_irq(&ztv->lock);

            /* tell the state machine we want it filled /NOW/ */
            zoran_cap(ztv, 1);

            /* wait till this buffer gets grabbed */
            wait_event_interruptible(ztv->grabq,
                        (unused->status != FBUFFER_BUSY));
            /* see if a signal did it */
            if (signal_pending(current))
                  return -EINTR;
            done = unused;
      }
      else
            write_unlock_irq(&ztv->lock);

      /* Yes! we got data! */
      max = done->bpl * done->h;
      if (count > max)
            count = max;
      if (copy_to_user((void*)buf, done->memadr, count))
            count = -EFAULT;

      /* keep the engine running */
      done->status = FBUFFER_FREE;
//    zoran_cap(ztv,1);

      /* tell listeners this buffer became free */
      wake_up_interruptible(&ztv->grabq);

      /* goodbye */
      DEBUG(printk(CARD_DEBUG "zoran_read() returns %lu\n",CARD,count));
      return count;
}

static
long zoran_write(struct video_device* dev, const char* buf, unsigned long count, int nonblock)
{
      struct zoran *ztv = (struct zoran *)dev;
      UNUSED(ztv); UNUSED(dev); UNUSED(buf); UNUSED(count); UNUSED(nonblock);
      DEBUG(printk(CARD_DEBUG "zoran_write\n",CARD));
      return -EINVAL;
}

static
unsigned int zoran_poll(struct video_device *dev, struct file *file, poll_table *wait)
{
      struct zoran *ztv = (struct zoran *)dev;
      struct vidinfo* item;
      unsigned int mask = 0;

      poll_wait(file, &ztv->grabq, wait);

      for (item=ztv->grabinfo; item!=ztv->grabinfo+ZORAN_MAX_FBUFFERS; item++)
            if (item->status == FBUFFER_DONE)
            {
                  mask |= (POLLIN | POLLRDNORM);
                  break;
            }

      DEBUG(printk(CARD_DEBUG "zoran_poll()=%x\n",CARD,mask));

      return mask;
}

/* append a new clipregion to the vector of video_clips */
static
void new_clip(struct video_window* vw, struct video_clip* vcp, int x, int y, int w, int h)
{
      vcp[vw->clipcount].x = x;
      vcp[vw->clipcount].y = y;
      vcp[vw->clipcount].width = w;
      vcp[vw->clipcount].height = h;
      vw->clipcount++;
}

static
int zoran_ioctl(struct video_device* dev, unsigned int cmd, void *arg)
{
      struct zoran* ztv = (struct zoran*)dev;

      switch (cmd) {
       case VIDIOCGCAP:
       {
            struct video_capability c;
            DEBUG(printk(CARD_DEBUG "VIDIOCGCAP\n",CARD));

            strcpy(c.name,ztv->video_dev.name);
            c.type = VID_TYPE_CAPTURE|
                   VID_TYPE_OVERLAY|
                   VID_TYPE_CLIPPING|
                   VID_TYPE_FRAMERAM|
                   VID_TYPE_SCALES;
            if (ztv->have_tuner)
                  c.type |= VID_TYPE_TUNER;
            if (ztv->have_decoder) {
                  c.channels = ztv->card->video_inputs;
                  c.audios = ztv->card->audio_inputs;
            } else
                  /* no decoder -> no channels */
                  c.channels = c.audios = 0;
            c.maxwidth = 768;
            c.maxheight = 576;
            c.minwidth = 32;
            c.minheight = 32;
            if (copy_to_user(arg,&c,sizeof(c)))
                  return -EFAULT;
            break;
       }

       case VIDIOCGCHAN:
       {
            struct video_channel v;
            int mux;
            if (copy_from_user(&v, arg,sizeof(v)))
                  return -EFAULT;
            DEBUG(printk(CARD_DEBUG "VIDIOCGCHAN(%d)\n",CARD,v.channel));
            v.flags=VIDEO_VC_AUDIO
#ifdef VIDEO_VC_NORM
                  |VIDEO_VC_NORM
#endif
                  ;
            v.tuners=0;
            v.type=VIDEO_TYPE_CAMERA;
#ifdef I_EXPECT_POSSIBLE_NORMS_IN_THE_API
            v.norm=VIDEO_MODE_PAL|
                   VIDEO_MODE_NTSC|
                   VIDEO_MODE_SECAM;
#else
            v.norm=VIDEO_MODE_PAL;
#endif
            /* too many inputs? no decoder -> no channels */
            if (!ztv->have_decoder || v.channel < 0 ||  v.channel >= ztv->card->video_inputs)
                  return -EINVAL;

            /* now determine the name of the channel */
            mux = ztv->card->video_mux[v.channel];
            if (mux & IS_TUNER) {
                  /* lets assume only one tuner, yes? */
                  strcpy(v.name,"Television");
                  v.type = VIDEO_TYPE_TV;
                  if (ztv->have_tuner) {
                        v.flags |= VIDEO_VC_TUNER;
                        v.tuners = 1;
                  }
            }
            else if (mux & IS_SVHS)
                  sprintf(v.name,"S-Video-%d",v.channel);
            else
                  sprintf(v.name,"CVBS-%d",v.channel);

            if (copy_to_user(arg,&v,sizeof(v)))
                  return -EFAULT;
            break;
       }
       case VIDIOCSCHAN:
       {    /* set video channel */
            struct video_channel v;
            if (copy_from_user(&v, arg,sizeof(v)))
                  return -EFAULT;
            DEBUG(printk(CARD_DEBUG "VIDIOCSCHAN(%d,%d)\n",CARD,v.channel,v.norm));

            /* too many inputs? no decoder -> no channels */
            if (!ztv->have_decoder || v.channel >= ztv->card->video_inputs || v.channel < 0)
                  return -EINVAL;

            if (v.norm != VIDEO_MODE_PAL &&
                v.norm != VIDEO_MODE_NTSC &&
                v.norm != VIDEO_MODE_SECAM &&
                v.norm != VIDEO_MODE_AUTO)
                  return -EOPNOTSUPP;

            /* make it happen, nr1! */
            return zoran_muxsel(ztv,v.channel,v.norm);
       }

       case VIDIOCGTUNER:
       {
            struct video_tuner v;
            if (copy_from_user(&v, arg,sizeof(v)))
                  return -EFAULT;
            DEBUG(printk(CARD_DEBUG "VIDIOCGTUNER(%d)\n",CARD,v.tuner));

            /* Only no or one tuner for now */
            if (!ztv->have_tuner || v.tuner)
                  return -EINVAL;

            strcpy(v.name,"Television");
            v.rangelow  = 0;
            v.rangehigh = ~0;
            v.flags     = VIDEO_TUNER_PAL|VIDEO_TUNER_NTSC|VIDEO_TUNER_SECAM;
            v.mode      = ztv->norm;
            v.signal    = 0xFFFF; /* unknown */

            if (copy_to_user(arg,&v,sizeof(v)))
                  return -EFAULT;
            break;
       }
       case VIDIOCSTUNER:
       {
            struct video_tuner v;
            if (copy_from_user(&v, arg, sizeof(v)))
                  return -EFAULT;
            DEBUG(printk(CARD_DEBUG "VIDIOCSTUNER(%d,%d)\n",CARD,v.tuner,v.mode));

            /* Only no or one tuner for now */
            if (!ztv->have_tuner || v.tuner)
                  return -EINVAL;

            /* and it only has certain valid modes */
            if( v.mode != VIDEO_MODE_PAL &&
                v.mode != VIDEO_MODE_NTSC &&
                v.mode != VIDEO_MODE_SECAM)
                  return -EOPNOTSUPP;

            /* engage! */
            return zoran_muxsel(ztv,v.tuner,v.mode);
       }

       case VIDIOCGPICT:
       {
            struct video_picture p = ztv->picture;
            DEBUG(printk(CARD_DEBUG "VIDIOCGPICT\n",CARD));
            p.depth = ztv->depth;
            switch (p.depth) {
             case  8: p.palette=VIDEO_PALETTE_YUV422;
                    break;
             case 15: p.palette=VIDEO_PALETTE_RGB555;
                    break;
             case 16: p.palette=VIDEO_PALETTE_RGB565;
                    break;
             case 24: p.palette=VIDEO_PALETTE_RGB24;
                    break;
             case 32: p.palette=VIDEO_PALETTE_RGB32;
                    break;
            }
            if (copy_to_user(arg, &p, sizeof(p)))
                  return -EFAULT;
            break;
       }
       case VIDIOCSPICT:
       {
            struct video_picture p;
            if (copy_from_user(&p, arg,sizeof(p)))
                  return -EFAULT;
            DEBUG(printk(CARD_DEBUG "VIDIOCSPICT(%d,%d,%d,%d,%d,%d,%d)\n",CARD,p.brightness,p.hue,p.colour,p.contrast,p.whiteness,p.depth,p.palette));

            /* depth must match with framebuffer */
            if (p.depth != ztv->depth)
                  return -EINVAL;

            /* check if palette matches this bpp */
            if (p.palette>NRPALETTES ||
                palette2fmt[p.palette].bpp != ztv->overinfo.bpp)
                  return -EINVAL;

            write_lock_irq(&ztv->lock);
            ztv->overinfo.format = p.palette;
            ztv->picture = p;
            write_unlock_irq(&ztv->lock);

            /* tell the decoder */
            i2c_control_device(&ztv->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_PICTURE, &p);
            break;
       }

       case VIDIOCGWIN:
       {
            struct video_window vw;
            DEBUG(printk(CARD_DEBUG "VIDIOCGWIN\n",CARD));
            read_lock(&ztv->lock);
            vw.x      = ztv->overinfo.x;
            vw.y      = ztv->overinfo.y;
            vw.width  = ztv->overinfo.w;
            vw.height = ztv->overinfo.h;
            vw.chromakey= 0;
            vw.flags  = 0;
            if (ztv->vidInterlace)
                  vw.flags|=VIDEO_WINDOW_INTERLACE;
            read_unlock(&ztv->lock);
            if (copy_to_user(arg,&vw,sizeof(vw)))
                  return -EFAULT;
            break;
       }
       case VIDIOCSWIN:
       {
            struct video_window vw;
            struct video_clip *vcp;
            int on;
            if (copy_from_user(&vw,arg,sizeof(vw)))
                  return -EFAULT;
            DEBUG(printk(CARD_DEBUG "VIDIOCSWIN(%d,%d,%d,%d,%x,%d)\n",CARD,vw.x,vw.y,vw.width,vw.height,vw.flags,vw.clipcount));

            if (vw.flags)
                  return -EINVAL;

            if (vw.clipcount <0 || vw.clipcount>256)
                  return -EDOM;   /* Too many! */

            /*
             *      Do any clips.
             */
            vcp = vmalloc(sizeof(struct video_clip)*(vw.clipcount+4));
            if (vcp==NULL)
                  return -ENOMEM;
            if (vw.clipcount && copy_from_user(vcp,vw.clips,sizeof(struct video_clip)*vw.clipcount)) {
                  vfree(vcp);
                  return -EFAULT;
            }

            on = ztv->running;
            if (on)
                  zoran_cap(ztv, 0);

            /*
             * strange, it seems xawtv sometimes calls us with 0
             * width and/or height. Ignore these values
             */
            if (vw.x == 0)
                  vw.x = ztv->overinfo.x;
            if (vw.y == 0)
                  vw.y = ztv->overinfo.y;

            /* by now we are committed to the new data... */
            write_lock_irq(&ztv->lock);
            ztv->overinfo.x = vw.x;
            ztv->overinfo.y = vw.y;
            ztv->overinfo.w = vw.width;
            ztv->overinfo.h = vw.height;
            write_unlock_irq(&ztv->lock);

            /*
             *      Impose display clips
             */
            if (vw.x+vw.width > ztv->swidth)
                  new_clip(&vw, vcp, ztv->swidth-vw.x, 0, vw.width-1, vw.height-1);
            if (vw.y+vw.height > ztv->sheight)
                  new_clip(&vw, vcp, 0, ztv->sheight-vw.y, vw.width-1, vw.height-1);

            /* built the requested clipping zones */
            zoran_set_geo(ztv, &ztv->overinfo);
            zoran_built_overlay(ztv, vw.clipcount, vcp);
            vfree(vcp);

            /* if we were on, restart the video engine */
            if (on)
                  zoran_cap(ztv, 1);
            break;
       }

       case VIDIOCCAPTURE:
       {
            int v;
            if (get_user(v, (int *)arg))
                  return -EFAULT;
            DEBUG(printk(CARD_DEBUG "VIDIOCCAPTURE(%d)\n",CARD,v));

            if (v==0) {
                  clear_bit(STATE_OVERLAY, &ztv->state);
                  zoran_cap(ztv, 1);
            }
            else {
                  /* is VIDIOCSFBUF, VIDIOCSWIN done? */
                  if (ztv->overinfo.busadr==0 || ztv->overinfo.w==0 || ztv->overinfo.h==0)
                        return -EINVAL;

                  set_bit(STATE_OVERLAY, &ztv->state);
                  zoran_cap(ztv, 1);
            }
            break;
       }

       case VIDIOCGFBUF:
       {
            struct video_buffer v;
            DEBUG(printk(CARD_DEBUG "VIDIOCGFBUF\n",CARD));
            read_lock(&ztv->lock);
            v.base   = (void *)ztv->overinfo.busadr;
            v.height = ztv->sheight;
            v.width  = ztv->swidth;
            v.depth  = ztv->depth;
            v.bytesperline = ztv->overinfo.bpl;
            read_unlock(&ztv->lock);
            if(copy_to_user(arg, &v,sizeof(v)))
                  return -EFAULT;
            break;
       }
       case VIDIOCSFBUF:
       {
            struct video_buffer v;
            if(!capable(CAP_SYS_ADMIN))
                  return -EPERM;
            if (copy_from_user(&v, arg,sizeof(v)))
                  return -EFAULT;
            DEBUG(printk(CARD_DEBUG "VIDIOCSFBUF(%p,%d,%d,%d,%d)\n",CARD,v.base, v.width,v.height,v.depth,v.bytesperline));

            if (v.depth!=15 && v.depth!=16 && v.depth!=24 && v.depth!=32)
                  return -EINVAL;
            if (v.bytesperline<1)
                  return -EINVAL;
            if (ztv->running)
                  return -EBUSY;
            write_lock_irq(&ztv->lock);
            ztv->overinfo.busadr  = (ulong)v.base;
            ztv->sheight      = v.height;
            ztv->swidth       = v.width;
            ztv->depth        = v.depth;        /* bits per pixel */
            ztv->overinfo.bpp = ((v.depth+1)&0x38)/8;/* bytes per pixel */
            ztv->overinfo.bpl = v.bytesperline; /* bytes per line */
            write_unlock_irq(&ztv->lock);
            break;
       }

       case VIDIOCKEY:
       {
            /* Will be handled higher up .. */
            break;
       }

       case VIDIOCSYNC:
       {
            int i;
            if (get_user(i, (int *) arg))
                  return -EFAULT;
            DEBUG(printk(CARD_DEBUG "VIDEOCSYNC(%d)\n",CARD,i));
            if (i<0 || i>ZORAN_MAX_FBUFFERS)
                  return -EINVAL;
            switch (ztv->grabinfo[i].status) {
             case FBUFFER_FREE:
                  return -EINVAL;
             case FBUFFER_BUSY:
                  /* wait till this buffer gets grabbed */
                  wait_event_interruptible(ztv->grabq,
                              (ztv->grabinfo[i].status != FBUFFER_BUSY));
                  /* see if a signal did it */
                  if (signal_pending(current))
                        return -EINTR;
                  /* don't fall through; a DONE buffer is not UNUSED */
                  break;
             case FBUFFER_DONE:
                  ztv->grabinfo[i].status = FBUFFER_FREE;
                  /* tell ppl we have a spare buffer */
                  wake_up_interruptible(&ztv->grabq);
                  break;
            }
            DEBUG(printk(CARD_DEBUG "VIDEOCSYNC(%d) returns\n",CARD,i));
            break;
       }

       case VIDIOCMCAPTURE:
       {
            struct video_mmap vm;
            struct vidinfo* frame;
            if (copy_from_user(&vm,arg,sizeof(vm)))
                  return -EFAULT;
            DEBUG(printk(CARD_DEBUG "VIDIOCMCAPTURE(%d,(%d,%d),%d)\n",CARD,vm.frame,vm.width,vm.height,vm.format));
            if (vm.frame<0 || vm.frame>ZORAN_MAX_FBUFFERS ||
                vm.width<32 || vm.width>768 ||
                vm.height<32 || vm.height>576 ||
                vm.format>NRPALETTES ||
                palette2fmt[vm.format].mode == 0)
                  return -EINVAL;

            /* we are allowed to take over UNUSED and DONE buffers */
            frame = &ztv->grabinfo[vm.frame];
            if (frame->status == FBUFFER_BUSY)
                  return -EBUSY;

            /* setup the other parameters if they are given */
            write_lock_irq(&ztv->lock);
            frame->w = vm.width;
            frame->h = vm.height;
            frame->format = vm.format;
            frame->bpp = palette2fmt[frame->format].bpp;
            frame->bpl = frame->w*frame->bpp;
            frame->status = FBUFFER_BUSY;
            frame->next = 0;
            { /* add to tail of queue */
              struct vidinfo* oldframe = ztv->workqueue;
              if (!oldframe) ztv->workqueue = frame;
              else {
                while (oldframe->next) oldframe = oldframe->next;
                oldframe->next = frame;
              }
            }
            write_unlock_irq(&ztv->lock);
            zoran_cap(ztv, 1);
            break;
       }

       case VIDIOCGMBUF:
       {
            struct video_mbuf mb;
            int i;
            DEBUG(printk(CARD_DEBUG "VIDIOCGMBUF\n",CARD));
            mb.size = ZORAN_MAX_FBUFSIZE;
            mb.frames = ZORAN_MAX_FBUFFERS;
            for (i=0; i<ZORAN_MAX_FBUFFERS; i++)
                  mb.offsets[i] = i*ZORAN_MAX_FBUFFER;
            if(copy_to_user(arg, &mb,sizeof(mb)))
                  return -EFAULT;
            break;
       }

       case VIDIOCGUNIT:
       {
            struct video_unit vu;
            DEBUG(printk(CARD_DEBUG "VIDIOCGUNIT\n",CARD));
            vu.video = ztv->video_dev.minor;
            vu.vbi = ztv->vbi_dev.minor;
            vu.radio = VIDEO_NO_UNIT;
            vu.audio = VIDEO_NO_UNIT;
            vu.teletext = VIDEO_NO_UNIT;
            if(copy_to_user(arg, &vu,sizeof(vu)))
                  return -EFAULT;
            break;
       }

       case VIDIOCGFREQ:
       {
            unsigned long v = ztv->tuner_freq;
            if (copy_to_user(arg,&v,sizeof(v)))
                  return -EFAULT;
            DEBUG(printk(CARD_DEBUG "VIDIOCGFREQ\n",CARD));
            break;
       }
       case VIDIOCSFREQ:
       {
            unsigned long v;
            if (copy_from_user(&v, arg, sizeof(v)))
                  return -EFAULT;
            DEBUG(printk(CARD_DEBUG "VIDIOCSFREQ\n",CARD));

            if (ztv->have_tuner) {
                  int fixme = v;
                  if (i2c_control_device(&(ztv->i2c), I2C_DRIVERID_TUNER, TUNER_SET_TVFREQ, &fixme) < 0)
                        return -EAGAIN;
            }
            ztv->tuner_freq = v;
            break;
       }

       /* Why isn't this in the API?
        * And why doesn't it take a buffer number?
       case BTTV_FIELDNR:
       {
            unsigned long v = ztv->lastfieldnr;
            if (copy_to_user(arg,&v,sizeof(v)))
                  return -EFAULT;
            DEBUG(printk(CARD_DEBUG "BTTV_FIELDNR\n",CARD));
            break;
       }
       */

       default:
            return -ENOIOCTLCMD;
      }
      return 0;
}

static
int zoran_mmap(struct vm_area_struct *vma, struct video_device* dev, const char* adr, unsigned long size)
{
      struct zoran* ztv = (struct zoran*)dev;
      unsigned long start = (unsigned long)adr;
      unsigned long pos;

      DEBUG(printk(CARD_DEBUG "zoran_mmap(0x%p,%ld)\n",CARD,adr,size));

      /* sanity checks */
      if (size > ZORAN_MAX_FBUFSIZE || !ztv->fbuffer)
            return -EINVAL;

      /* start mapping the whole shabang to user memory */
      pos = (unsigned long)ztv->fbuffer;
      while (size>0) {
            unsigned long pfn = virt_to_phys((void*)pos) >> PAGE_SHIFT;
            if (remap_pfn_range(vma, start, pfn, PAGE_SIZE, PAGE_SHARED))
                  return -EAGAIN;
            start += PAGE_SIZE;
            pos += PAGE_SIZE;
            size -= PAGE_SIZE;
      }
      return 0;
}

static struct video_device zr36120_template=
{
      .owner            = THIS_MODULE,
      .name       = "UNSET",
      .type       = VID_TYPE_TUNER|VID_TYPE_CAPTURE|VID_TYPE_OVERLAY,
      .hardware   = VID_HARDWARE_ZR36120,
      .open       = zoran_open,
      .close            = zoran_close,
      .read       = zoran_read,
      .write            = zoran_write,
      .poll       = zoran_poll,
      .ioctl            = zoran_ioctl,
      .compat_ioctl     = v4l_compat_ioctl32,
      .mmap       = zoran_mmap,
      .minor            = -1,
};

static
int vbi_open(struct video_device *dev, int flags)
{
      struct zoran *ztv = dev->priv;
      struct vidinfo* item;

      DEBUG(printk(CARD_DEBUG "vbi_open(dev,%d)\n",CARD,flags));

      /*
       * During VBI device open, we continiously grab VBI-like
       * data in the vbi buffer when we have nothing to do.
       * Only when there is an explicit request for VBI data
       * (read call) we /force/ a read.
       */

      /* allocate buffers */
      for (item=ztv->readinfo; item!=ztv->readinfo+ZORAN_VBI_BUFFERS; item++)
      {
            item->status = FBUFFER_FREE;

            /* alloc */
            if (!item->memadr) {
                  item->memadr = bmalloc(ZORAN_VBI_BUFSIZE);
                  if (!item->memadr) {
                        /* could not get a buffer, bail out */
                        while (item != ztv->readinfo) {
                              item--;
                              bfree(item->memadr, ZORAN_VBI_BUFSIZE);
                              item->memadr = 0;
                              item->busadr = 0;
                        }
                        return -ENOBUFS;
                  }
            }

            /* determine the DMAable address */
            item->busadr = virt_to_bus(item->memadr);
      }

      /* do the common part of all open's */
      zoran_common_open(ztv, flags);

      set_bit(STATE_VBI, &ztv->state);
      /* start read-ahead */
      zoran_cap(ztv, 1);

      return 0;
}

static
void vbi_close(struct video_device *dev)
{
      struct zoran *ztv = dev->priv;
      struct vidinfo* item;

      DEBUG(printk(CARD_DEBUG "vbi_close(dev)\n",CARD));

      /* driver specific closure */
      clear_bit(STATE_VBI, &ztv->state);

      zoran_common_close(ztv);

      /*
       *      This is sucky but right now I can't find a good way to
       *      be sure its safe to free the buffer. We wait 5-6 fields
       *      which is more than sufficient to be sure.
       */
      msleep(100);                  /* Wait 1/10th of a second */

      for (item=ztv->readinfo; item!=ztv->readinfo+ZORAN_VBI_BUFFERS; item++)
      {
            if (item->memadr)
                  bfree(item->memadr, ZORAN_VBI_BUFSIZE);
            item->memadr = 0;
      }

}

/*
 * This read function could be used reentrant in a SMP situation.
 *
 * This is made possible by the spinlock which is kept till we
 * found and marked a buffer for our own use. The lock must
 * be released as soon as possible to prevent lock contention.
 */
static
long vbi_read(struct video_device* dev, char* buf, unsigned long count, int nonblock)
{
      struct zoran *ztv = dev->priv;
      unsigned long max;
      struct vidinfo* unused = 0;
      struct vidinfo* done = 0;

      DEBUG(printk(CARD_DEBUG "vbi_read(0x%p,%ld,%d)\n",CARD,buf,count,nonblock));

      /* find ourself a free or completed buffer */
      for (;;) {
            struct vidinfo* item;

            write_lock_irq(&ztv->lock);
            for (item=ztv->readinfo; item!=ztv->readinfo+ZORAN_VBI_BUFFERS; item++) {
                  if (!unused && item->status == FBUFFER_FREE)
                        unused = item;
                  if (!done && item->status == FBUFFER_DONE)
                        done = item;
            }
            if (done || unused)
                  break;

            /* no more free buffers, wait for them. */
            write_unlock_irq(&ztv->lock);
            if (nonblock)
                  return -EWOULDBLOCK;
            interruptible_sleep_on(&ztv->vbiq);
            if (signal_pending(current))
                  return -EINTR;
      }

      /* Do we have 'ready' data? */
      if (!done) {
            /* no? than this will take a while... */
            if (nonblock) {
                  write_unlock_irq(&ztv->lock);
                  return -EWOULDBLOCK;
            }

            /* mark the unused buffer as wanted */
            unused->status = FBUFFER_BUSY;
            unused->next = 0;
            { /* add to tail of queue */
              struct vidinfo* oldframe = ztv->workqueue;
              if (!oldframe) ztv->workqueue = unused;
              else {
                while (oldframe->next) oldframe = oldframe->next;
                oldframe->next = unused;
              }
            }
            write_unlock_irq(&ztv->lock);

            /* tell the state machine we want it filled /NOW/ */
            zoran_cap(ztv, 1);

            /* wait till this buffer gets grabbed */
            wait_event_interruptible(ztv->vbiq,
                        (unused->status != FBUFFER_BUSY));
            /* see if a signal did it */
            if (signal_pending(current))
                  return -EINTR;
            done = unused;
      }
      else
            write_unlock_irq(&ztv->lock);

      /* Yes! we got data! */
      max = done->bpl * -done->h;
      if (count > max)
            count = max;

      /* check if the user gave us enough room to write the data */
      if (!access_ok(VERIFY_WRITE, buf, count)) {
            count = -EFAULT;
            goto out;
      }

      /*
       * Now transform/strip the data from YUV to Y-only
       * NB. Assume the Y is in the LSB of the YUV data.
       */
      {
      unsigned char* optr = buf;
      unsigned char* eptr = buf+count;

      /* are we beeing accessed from an old driver? */
      if (count == 2*19*2048) {
            /*
             * Extreme HACK, old VBI programs expect 2048 points
             * of data, and we only got 864 orso. Double each
             * datapoint and clear the rest of the line.
             * This way we have appear to have a
             * sample_frequency of 29.5 Mc.
             */
            int x,y;
            unsigned char* iptr = done->memadr+1;
            for (y=done->h; optr<eptr && y<0; y++)
            {
                  /* copy to doubled data to userland */
                  for (x=0; optr+1<eptr && x<-done->w; x++)
                  {
                        unsigned char a = iptr[x*2];
                        __put_user(a, optr++);
                        __put_user(a, optr++);
                  }
                  /* and clear the rest of the line */
                  for (x*=2; optr<eptr && x<done->bpl; x++)
                        __put_user(0, optr++);
                  /* next line */
                  iptr += done->bpl;
            }
      }
      else {
            /*
             * Other (probably newer) programs asked
             * us what geometry we are using, and are
             * reading the correct size.
             */
            int x,y;
            unsigned char* iptr = done->memadr+1;
            for (y=done->h; optr<eptr && y<0; y++)
            {
                  /* copy to doubled data to userland */
                  for (x=0; optr<eptr && x<-done->w; x++)
                        __put_user(iptr[x*2], optr++);
                  /* and clear the rest of the line */
                  for (;optr<eptr && x<done->bpl; x++)
                        __put_user(0, optr++);
                  /* next line */
                  iptr += done->bpl;
            }
      }

      /* API compliance:
       * place the framenumber (half fieldnr) in the last long
       */
      __put_user(done->fieldnr/2, ((ulong*)eptr)[-1]);
      }

      /* keep the engine running */
      done->status = FBUFFER_FREE;
      zoran_cap(ztv, 1);

      /* tell listeners this buffer just became free */
      wake_up_interruptible(&ztv->vbiq);

      /* goodbye */
out:
      DEBUG(printk(CARD_DEBUG "vbi_read() returns %lu\n",CARD,count));
      return count;
}

static
unsigned int vbi_poll(struct video_device *dev, struct file *file, poll_table *wait)
{
      struct zoran *ztv = dev->priv;
      struct vidinfo* item;
      unsigned int mask = 0;

      poll_wait(file, &ztv->vbiq, wait);

      for (item=ztv->readinfo; item!=ztv->readinfo+ZORAN_VBI_BUFFERS; item++)
            if (item->status == FBUFFER_DONE)
            {
                  mask |= (POLLIN | POLLRDNORM);
                  break;
            }

      DEBUG(printk(CARD_DEBUG "vbi_poll()=%x\n",CARD,mask));

      return mask;
}

static
int vbi_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
{
      struct zoran* ztv = dev->priv;

      switch (cmd) {
       case VIDIOCGVBIFMT:
       {
            struct vbi_format f;
            DEBUG(printk(CARD_DEBUG "VIDIOCGVBIINFO\n",CARD));
            f.sampling_rate = 14750000UL;
            f.samples_per_line = -ztv->readinfo[0].w;
            f.sample_format = VIDEO_PALETTE_RAW;
            f.start[0] = f.start[1] = ztv->readinfo[0].y;
            f.start[1] += 312;
            f.count[0] = f.count[1] = -ztv->readinfo[0].h;
            f.flags = VBI_INTERLACED;
            if (copy_to_user(arg,&f,sizeof(f)))
                  return -EFAULT;
            break;
       }
       case VIDIOCSVBIFMT:
       {
            struct vbi_format f;
            int i;
            if (copy_from_user(&f, arg,sizeof(f)))
                  return -EFAULT;
            DEBUG(printk(CARD_DEBUG "VIDIOCSVBIINFO(%d,%d,%d,%d,%d,%d,%d,%x)\n",CARD,f.sampling_rate,f.samples_per_line,f.sample_format,f.start[0],f.start[1],f.count[0],f.count[1],f.flags));

            /* lots of parameters are fixed... (PAL) */
            if (f.sampling_rate != 14750000UL ||
                f.samples_per_line > 864 ||
                f.sample_format != VIDEO_PALETTE_RAW ||
                f.start[0] < 0 ||
                f.start[0] != f.start[1]-312 ||
                f.count[0] != f.count[1] ||
                f.start[0]+f.count[0] >= 288 ||
                f.flags != VBI_INTERLACED)
                  return -EINVAL;

            write_lock_irq(&ztv->lock);
            ztv->readinfo[0].y = f.start[0];
            ztv->readinfo[0].w = -f.samples_per_line;
            ztv->readinfo[0].h = -f.count[0];
            ztv->readinfo[0].bpl = f.samples_per_line*ztv->readinfo[0].bpp;
            for (i=1; i<ZORAN_VBI_BUFFERS; i++)
                  ztv->readinfo[i] = ztv->readinfo[i];
            write_unlock_irq(&ztv->lock);
            break;
       }
       default:
            return -ENOIOCTLCMD;
      }
      return 0;
}

static struct video_device vbi_template=
{
      .owner            = THIS_MODULE,
      .name       = "UNSET",
      .type       = VID_TYPE_CAPTURE|VID_TYPE_TELETEXT,
      .hardware   = VID_HARDWARE_ZR36120,
      .open       = vbi_open,
      .close            = vbi_close,
      .read       = vbi_read,
      .write            = zoran_write,
      .poll       = vbi_poll,
      .ioctl            = vbi_ioctl,
      .minor            = -1,
};

/*
 *      Scan for a Zoran chip, request the irq and map the io memory
 */
static
int __init find_zoran(void)
{
      int result;
      struct zoran *ztv;
      struct pci_dev *dev = NULL;
      unsigned char revision;
      int zoran_num=0;

      while ((dev = pci_find_device(PCI_VENDOR_ID_ZORAN,PCI_DEVICE_ID_ZORAN_36120, dev)))
      {
            /* Ok, a ZR36120/ZR36125 found! */
            ztv = &zorans[zoran_num];
            ztv->dev = dev;

            if (pci_enable_device(dev))
                  return -EIO;

            pci_read_config_byte(dev, PCI_CLASS_REVISION, &revision);
            printk(KERN_INFO "zoran: Zoran %x (rev %d) ",
                  dev->device, revision);
            printk("bus: %d, devfn: %d, irq: %d, ",
                  dev->bus->number, dev->devfn, dev->irq);
            printk("memory: 0x%08lx.\n", ztv->zoran_adr);

            ztv->zoran_mem = ioremap(ztv->zoran_adr, 0x1000);
            DEBUG(printk(KERN_DEBUG "zoran: mapped-memory at 0x%p\n",ztv->zoran_mem));

            result = request_irq(dev->irq, zoran_irq,
                  IRQF_SHARED|IRQF_DISABLED,"zoran", ztv);
            if (result==-EINVAL)
            {
                  iounmap(ztv->zoran_mem);
                  printk(KERN_ERR "zoran: Bad irq number or handler\n");
                  return -EINVAL;
            }
            if (result==-EBUSY)
                  printk(KERN_ERR "zoran: IRQ %d busy, change your PnP config in BIOS\n",dev->irq);
            if (result < 0) {
                  iounmap(ztv->zoran_mem);
                  return result;
            }
            /* Enable bus-mastering */
            pci_set_master(dev);

            zoran_num++;
      }
      if(zoran_num)
            printk(KERN_INFO "zoran: %d Zoran card(s) found.\n",zoran_num);
      return zoran_num;
}

static
int __init init_zoran(int card)
{
      struct zoran *ztv = &zorans[card];
      int   i;

      /* if the given cardtype valid? */
      if (cardtype[card]>=NRTVCARDS) {
            printk(KERN_INFO "invalid cardtype(%d) detected\n",cardtype[card]);
            return -1;
      }

      /* reset the zoran */
      zrand(~ZORAN_PCI_SOFTRESET,ZORAN_PCI);
      udelay(10);
      zror(ZORAN_PCI_SOFTRESET,ZORAN_PCI);
      udelay(10);

      /* zoran chip specific details */
      ztv->card = tvcards+cardtype[card]; /* point to the selected card */
      ztv->norm = 0;                      /* PAL */
      ztv->tuner_freq = 0;

      /* videocard details */
      ztv->swidth = 800;
      ztv->sheight = 600;
      ztv->depth = 16;

      /* State details */
      ztv->fbuffer = 0;
      ztv->overinfo.kindof = FBUFFER_OVERLAY;
      ztv->overinfo.status = FBUFFER_FREE;
      ztv->overinfo.x = 0;
      ztv->overinfo.y = 0;
      ztv->overinfo.w = 768; /* 640 */
      ztv->overinfo.h = 576; /* 480 */
      ztv->overinfo.format = VIDEO_PALETTE_RGB565;
      ztv->overinfo.bpp = palette2fmt[ztv->overinfo.format].bpp;
      ztv->overinfo.bpl = ztv->overinfo.bpp*ztv->swidth;
      ztv->overinfo.busadr = 0;
      ztv->overinfo.memadr = 0;
      ztv->overinfo.overlay = 0;
      for (i=0; i<ZORAN_MAX_FBUFFERS; i++) {
            ztv->grabinfo[i] = ztv->overinfo;
            ztv->grabinfo[i].kindof = FBUFFER_GRAB;
      }
      init_waitqueue_head(&ztv->grabq);

      /* VBI details */
      ztv->readinfo[0] = ztv->overinfo;
      ztv->readinfo[0].kindof = FBUFFER_VBI;
      ztv->readinfo[0].w = -864;
      ztv->readinfo[0].h = -38;
      ztv->readinfo[0].format = VIDEO_PALETTE_YUV422;
      ztv->readinfo[0].bpp = palette2fmt[ztv->readinfo[0].format].bpp;
      ztv->readinfo[0].bpl = 1024*ztv->readinfo[0].bpp;
      for (i=1; i<ZORAN_VBI_BUFFERS; i++)
            ztv->readinfo[i] = ztv->readinfo[0];
      init_waitqueue_head(&ztv->vbiq);

      /* maintenance data */
      ztv->have_decoder = 0;
      ztv->have_tuner = 0;
      ztv->tuner_type = 0;
      ztv->running = 0;
      ztv->users = 0;
      rwlock_init(&ztv->lock);
      ztv->workqueue = 0;
      ztv->fieldnr = 0;
      ztv->lastfieldnr = 0;

      if (triton1)
            zrand(~ZORAN_VDC_TRICOM, ZORAN_VDC);

      /* external FL determines TOP frame */
      zror(ZORAN_VFEC_EXTFL, ZORAN_VFEC);

      /* set HSpol */
      if (ztv->card->hsync_pos)
            zrwrite(ZORAN_VFEH_HSPOL, ZORAN_VFEH);
      /* set VSpol */
      if (ztv->card->vsync_pos)
            zrwrite(ZORAN_VFEV_VSPOL, ZORAN_VFEV);

      /* Set the proper General Purpuse register bits */
      /* implicit: no softreset, 0 waitstates */
      zrwrite(ZORAN_PCI_SOFTRESET|(ztv->card->gpdir<<0),ZORAN_PCI);
      /* implicit: 3 duration and recovery PCI clocks on guest 0-3 */
      zrwrite(ztv->card->gpval<<24,ZORAN_GUEST);

      /* clear interrupt status */
      zrwrite(~0, ZORAN_ISR);

      /*
       * i2c template
       */
      ztv->i2c = zoran_i2c_bus_template;
      sprintf(ztv->i2c.name,"zoran-%d",card);
      ztv->i2c.data = ztv;

      /*
       * Now add the template and register the device unit
       */
      ztv->video_dev = zr36120_template;
      strcpy(ztv->video_dev.name, ztv->i2c.name);
      ztv->video_dev.priv = ztv;
      if (video_register_device(&ztv->video_dev, VFL_TYPE_GRABBER, video_nr) < 0)
            return -1;

      ztv->vbi_dev = vbi_template;
      strcpy(ztv->vbi_dev.name, ztv->i2c.name);
      ztv->vbi_dev.priv = ztv;
      if (video_register_device(&ztv->vbi_dev, VFL_TYPE_VBI, vbi_nr) < 0) {
            video_unregister_device(&ztv->video_dev);
            return -1;
      }
      i2c_register_bus(&ztv->i2c);

      /* set interrupt mask - the PIN enable will be set later */
      zrwrite(ZORAN_ICR_GIRQ0|ZORAN_ICR_GIRQ1|ZORAN_ICR_CODE, ZORAN_ICR);

      printk(KERN_INFO "%s: installed %s\n",ztv->i2c.name,ztv->card->name);
      return 0;
}

static
void release_zoran(int max)
{
      struct zoran *ztv;
      int i;

      for (i=0;i<max; i++)
      {
            ztv = &zorans[i];

            /* turn off all capturing, DMA and IRQs */
            /* reset the zoran */
            zrand(~ZORAN_PCI_SOFTRESET,ZORAN_PCI);
            udelay(10);
            zror(ZORAN_PCI_SOFTRESET,ZORAN_PCI);
            udelay(10);

            /* first disable interrupts before unmapping the memory! */
            zrwrite(0, ZORAN_ICR);
            zrwrite(0xffffffffUL,ZORAN_ISR);

            /* free it */
            free_irq(ztv->dev->irq,ztv);

            /* unregister i2c_bus */
            i2c_unregister_bus((&ztv->i2c));

            /* unmap and free memory */
            if (ztv->zoran_mem)
                  iounmap(ztv->zoran_mem);

            video_unregister_device(&ztv->video_dev);
            video_unregister_device(&ztv->vbi_dev);
      }
}

void __exit zr36120_exit(void)
{
      release_zoran(zoran_cards);
}

int __init zr36120_init(void)
{
      int   card;

      handle_chipset();
      zoran_cards = find_zoran();
      if (zoran_cards<0)
            /* no cards found, no need for a driver */
            return -EIO;

      /* initialize Zorans */
      for (card=0; card<zoran_cards; card++) {
            if (init_zoran(card)<0) {
                  /* only release the zorans we have registered */
                  release_zoran(card);
                  return -EIO;
            }
      }
      return 0;
}

module_init(zr36120_init);
module_exit(zr36120_exit);

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