path: root/drivers/media/video/buz.c

/*
   buz - Iomega Buz driver version 1.0

   Copyright (C) 1999 Rainer Johanni <Rainer@Johanni.de>

   based on

   buz.0.0.3 Copyright (C) 1998 Dave Perks <dperks@ibm.net>

   and

   bttv - Bt848 frame grabber driver

   Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
   & Marcus Metzler (mocm@thp.uni-koeln.de)

   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/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/signal.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <linux/sched.h>
#include <asm/segment.h>
#include <linux/types.h>
#include <linux/wrapper.h>
#include <linux/spinlock.h>
#include <linux/vmalloc.h>

#include <linux/videodev.h>

#include <linux/version.h>
#include <asm/uaccess.h>

#include <linux/i2c-old.h>
#include "buz.h"
#include <linux/video_decoder.h>
#include <linux/video_encoder.h>

#define IRQ_MASK ( ZR36057_ISR_GIRQ0 | /* ZR36057_ISR_GIRQ1 | ZR36057_ISR_CodRepIRQ | */ ZR36057_ISR_JPEGRepIRQ )
#define GPIO_MASK 0xdf

/*
 
 BUZ
 
   GPIO0 = 1, take board out of reset
   GPIO1 = 1, take JPEG codec out of sleep mode
   GPIO3 = 1, deassert FRAME# to 36060
   

   GIRQ0 signals a vertical sync of the video signal
   GIRQ1 signals that ZR36060's DATERR# line is asserted.

   SAA7111A

   In their infinite wisdom, the Iomega engineers decided to
   use the same input line for composite and S-Video Color,
   although there are two entries not connected at all!
   Through this ingenious strike, it is not possible to
   keep two running video sources connected at the same time
   to Composite and S-VHS input!

   mode 0 - N/C
   mode 1 - S-Video Y
   mode 2 - noise or something I don't know
   mode 3 - Composite and S-Video C
   mode 4 - N/C
   mode 5 - S-Video (gain C independently selectable of gain Y)
   mode 6 - N/C
   mode 7 - S-Video (gain C adapted to gain Y)
 */

#define MAJOR_VERSION 1		/* driver major version */
#define MINOR_VERSION 0		/* driver minor version */

#define BUZ_NAME      "Iomega BUZ V-1.0"	/* name of the driver */

#define DEBUG(x)		/* Debug driver */
#define IDEBUG(x)		/* Debug interrupt handler */
#define IOCTL_DEBUG(x)


/* The parameters for this driver */

/*
   The video mem address of the video card.
   The driver has a little database for some videocards
   to determine it from there. If your video card is not in there
   you have either to give it to the driver as a parameter
   or set in in a VIDIOCSFBUF ioctl
 */

static unsigned long vidmem;	/* Video memory base address (default 0) */

/* Special purposes only: */

static int triton;		/* 0=no (default), 1=yes */
static int natoma;		/* 0=no (default), 1=yes */

/*
   Number and size of grab buffers for Video 4 Linux
   The vast majority of applications should not need more than 2,
   the very popular BTTV driver actually does ONLY have 2.
   Time sensitive applications might need more, the maximum
   is VIDEO_MAX_FRAME (defined in <linux/videodev.h>).

   The size is set so that the maximum possible request
   can be satisfied. Decrease  it, if bigphys_area alloc'd
   memory is low. If you don't have the bigphys_area patch,
   set it to 128 KB. Will you allow only to grab small
   images with V4L, but that's better than nothing.

   v4l_bufsize has to be given in KB !

 */

static int v4l_nbufs = 2;
static int v4l_bufsize = 128;	/* Everybody should be able to work with this setting */

/*
   Default input and video norm at startup of the driver.
 */

static int default_input;	/* 0=Composite (default), 1=S-VHS */
static int default_norm;	/* 0=PAL (default), 1=NTSC */

MODULE_PARM(vidmem, "i");
MODULE_PARM(triton, "i");
MODULE_PARM(natoma, "i");
MODULE_PARM(v4l_nbufs, "i");
MODULE_PARM(v4l_bufsize, "i");
MODULE_PARM(default_input, "i");
MODULE_PARM(default_norm, "i");

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

static int zoran_num;		/* number of Buzs in use */
static struct zoran zoran[BUZ_MAX];

/* forward references */

static void v4l_fbuffer_free(struct zoran *zr);
static void jpg_fbuffer_free(struct zoran *zr);
static void zoran_feed_stat_com(struct zoran *zr);



/*
 *   Allocate the V4L grab buffers
 *
 *   These have to be pysically contiguous.
 *   If v4l_bufsize <= KMALLOC_MAXSIZE we use kmalloc
 */

static int v4l_fbuffer_alloc(struct zoran *zr)
{
	int i, off;
	unsigned char *mem;

	for (i = 0; i < v4l_nbufs; i++) {
		if (zr->v4l_gbuf[i].fbuffer)
			printk(KERN_WARNING "%s: v4l_fbuffer_alloc: buffer %d allready allocated ?\n", zr->name, i);

		if (v4l_bufsize <= KMALLOC_MAXSIZE) {
			/* Use kmalloc */

			mem = (unsigned char *) kmalloc(v4l_bufsize, GFP_KERNEL);
			if (mem == 0) {
				printk(KERN_ERR "%s: kmalloc for V4L bufs failed\n", zr->name);
				v4l_fbuffer_free(zr);
				return -ENOBUFS;
			}
			zr->v4l_gbuf[i].fbuffer = mem;
			zr->v4l_gbuf[i].fbuffer_phys = virt_to_phys(mem);
			zr->v4l_gbuf[i].fbuffer_bus = virt_to_bus(mem);
			for (off = 0; off < v4l_bufsize; off += PAGE_SIZE)
				mem_map_reserve(virt_to_page(mem + off));
			DEBUG(printk(BUZ_INFO ": V4L frame %d mem 0x%x (bus: 0x%x=%d)\n", i, mem, virt_to_bus(mem), virt_to_bus(mem)));
		} else {
			v4l_fbuffer_free(zr);
			return -ENOBUFS;
		}
	}

	return 0;
}

/* free the V4L grab buffers */
static void v4l_fbuffer_free(struct zoran *zr)
{
	int i, off;
	unsigned char *mem;

	for (i = 0; i < v4l_nbufs; i++) {
		if (!zr->v4l_gbuf[i].fbuffer)
			continue;

		mem = zr->v4l_gbuf[i].fbuffer;
		for (off = 0; off < v4l_bufsize; off += PAGE_SIZE)
			mem_map_unreserve(virt_to_page(mem + off));
		kfree((void *) zr->v4l_gbuf[i].fbuffer);
		zr->v4l_gbuf[i].fbuffer = NULL;
	}
}

/*
 *   Allocate the MJPEG grab buffers.
 *
 *   If the requested buffer size is smaller than KMALLOC_MAXSIZE,
 *   kmalloc is used to request a physically contiguous area,
 *   else we allocate the memory in framgents with get_free_page.
 *
 *   If a Natoma chipset is present and this is a revision 1 zr36057,
 *   each MJPEG buffer needs to be physically contiguous.
 *   (RJ: This statement is from Dave Perks' original driver,
 *   I could never check it because I have a zr36067)
 *   The driver cares about this because it reduces the buffer
 *   size to KMALLOC_MAXSIZE in that case (which forces contiguous allocation).
 *
 *   RJ: The contents grab buffers needs never be accessed in the driver.
 *       Therefore there is no need to allocate them with vmalloc in order
 *       to get a contiguous virtual memory space.
 *       I don't understand why many other drivers first allocate them with
 *       vmalloc (which uses internally also get_free_page, but delivers you
 *       virtual addresses) and then again have to make a lot of efforts
 *       to get the physical address.
 *
 */

static int jpg_fbuffer_alloc(struct zoran *zr)
{
	int i, j, off, alloc_contig;
	unsigned long mem;

	/* Decide if we should alloc contiguous or fragmented memory */
	/* This has to be identical in jpg_fbuffer_alloc and jpg_fbuffer_free */

	alloc_contig = (zr->jpg_bufsize < KMALLOC_MAXSIZE);

	for (i = 0; i < zr->jpg_nbufs; i++) {
		if (zr->jpg_gbuf[i].frag_tab)
			printk(KERN_WARNING "%s: jpg_fbuffer_alloc: buffer %d allready allocated ???\n", zr->name, i);

		/* Allocate fragment table for this buffer */

		mem = get_free_page(GFP_KERNEL);
		if (mem == 0) {
			printk(KERN_ERR "%s: jpg_fbuffer_alloc: get_free_page (frag_tab) failed for buffer %d\n", zr->name, i);
			jpg_fbuffer_free(zr);
			return -ENOBUFS;
		}
		memset((void *) mem, 0, PAGE_SIZE);
		zr->jpg_gbuf[i].frag_tab = (u32 *) mem;
		zr->jpg_gbuf[i].frag_tab_bus = virt_to_bus((void *) mem);

		if (alloc_contig) {
			mem = (unsigned long) kmalloc(zr->jpg_bufsize, GFP_KERNEL);
			if (mem == 0) {
				jpg_fbuffer_free(zr);
				return -ENOBUFS;
			}
			zr->jpg_gbuf[i].frag_tab[0] = virt_to_bus((void *) mem);
			zr->jpg_gbuf[i].frag_tab[1] = ((zr->jpg_bufsize / 4) << 1) | 1;
			for (off = 0; off < zr->jpg_bufsize; off += PAGE_SIZE)
				mem_map_reserve(virt_to_page(mem + off));
		} else {
			/* jpg_bufsize is alreay page aligned */
			for (j = 0; j < zr->jpg_bufsize / PAGE_SIZE; j++) {
				mem = get_free_page(GFP_KERNEL);
				if (mem == 0) {
					jpg_fbuffer_free(zr);
					return -ENOBUFS;
				}
				zr->jpg_gbuf[i].frag_tab[2 * j] = virt_to_bus((void *) mem);
				zr->jpg_gbuf[i].frag_tab[2 * j + 1] = (PAGE_SIZE / 4) << 1;
				mem_map_reserve(virt_to_page(mem));
			}

			zr->jpg_gbuf[i].frag_tab[2 * j - 1] |= 1;
		}
	}

	DEBUG(printk("jpg_fbuffer_alloc: %d KB allocated\n",
		     (zr->jpg_nbufs * zr->jpg_bufsize) >> 10));
	zr->jpg_buffers_allocated = 1;
	return 0;
}

/* free the MJPEG grab buffers */
static void jpg_fbuffer_free(struct zoran *zr)
{
	int i, j, off, alloc_contig;
	unsigned char *mem;

	/* Decide if we should alloc contiguous or fragmented memory */
	/* This has to be identical in jpg_fbuffer_alloc and jpg_fbuffer_free */

	alloc_contig = (zr->jpg_bufsize < KMALLOC_MAXSIZE);

	for (i = 0; i < zr->jpg_nbufs; i++) {
		if (!zr->jpg_gbuf[i].frag_tab)
			continue;

		if (alloc_contig) {
			if (zr->jpg_gbuf[i].frag_tab[0]) {
				mem = (unsigned char *) bus_to_virt(zr->jpg_gbuf[i].frag_tab[0]);
				for (off = 0; off < zr->jpg_bufsize; off += PAGE_SIZE)
					mem_map_unreserve(virt_to_page(mem + off));
				kfree((void *) mem);
				zr->jpg_gbuf[i].frag_tab[0] = 0;
				zr->jpg_gbuf[i].frag_tab[1] = 0;
			}
		} else {
			for (j = 0; j < zr->jpg_bufsize / PAGE_SIZE; j++) {
				if (!zr->jpg_gbuf[i].frag_tab[2 * j])
					break;
				mem_map_unreserve(virt_to_page(bus_to_virt(zr->jpg_gbuf[i].frag_tab[2 * j])));
				free_page((unsigned long) bus_to_virt(zr->jpg_gbuf[i].frag_tab[2 * j]));
				zr->jpg_gbuf[i].frag_tab[2 * j] = 0;
				zr->jpg_gbuf[i].frag_tab[2 * j + 1] = 0;
			}
		}

		free_page((unsigned long) zr->jpg_gbuf[i].frag_tab);
		zr->jpg_gbuf[i].frag_tab = NULL;
	}
	zr->jpg_buffers_allocated = 0;
}


/* ----------------------------------------------------------------------- */

/* I2C functions                                                           */

#define I2C_DELAY   10


/* software I2C functions */

static void i2c_setlines(struct i2c_bus *bus, int ctrl, int data)
{
	struct zoran *zr = (struct zoran *) bus->data;
	btwrite((data << 1) | ctrl, ZR36057_I2CBR);
	btread(ZR36057_I2CBR);
	udelay(I2C_DELAY);
}

static int i2c_getdataline(struct i2c_bus *bus)
{
	struct zoran *zr = (struct zoran *) bus->data;
	return (btread(ZR36057_I2CBR) >> 1) & 1;
}

static void attach_inform(struct i2c_bus *bus, int id)
{
	DEBUG(struct zoran *zr = (struct zoran *) bus->data);
	DEBUG(printk(BUZ_DEBUG "-%u: i2c attach %02x\n", zr->id, id));
}

static void detach_inform(struct i2c_bus *bus, int id)
{
	DEBUG(struct zoran *zr = (struct zoran *) bus->data);
	DEBUG(printk(BUZ_DEBUG "-%u: i2c detach %02x\n", zr->id, id));
}

static struct i2c_bus zoran_i2c_bus_template = {
	name:			"zr36057",
	id:			I2C_BUSID_BT848,
	bus_lock:		SPIN_LOCK_UNLOCKED,

	attach_inform:		attach_inform,
	detach_inform:		detach_inform,

	i2c_setlines:		i2c_setlines,
	i2c_getdataline:	i2c_getdataline,
};


/* ----------------------------------------------------------------------- */

static void GPIO(struct zoran *zr, unsigned bit, unsigned value)
{
	u32 reg;
	u32 mask;

	mask = 1 << (24 + bit);
	reg = btread(ZR36057_GPPGCR1) & ~mask;
	if (value) {
		reg |= mask;
	}
	btwrite(reg, ZR36057_GPPGCR1);
	/* Stop any PCI posting on the GPIO bus */
	btread(ZR36057_I2CBR);
}


/*
 *   Set the registers for the size we have specified. Don't bother
 *   trying to understand this without the ZR36057 manual in front of
 *   you [AC].
 *
 *   PS: The manual is free for download in .pdf format from
 *   www.zoran.com - nicely done those folks.
 */

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

static struct tvnorm tvnorms[] =
{
   /* PAL-BDGHI */
	{864, 720, 625, 576, 31, 16},
   /* NTSC */
	{858, 720, 525, 480, 21, 8},
};
#define TVNORMS (sizeof(tvnorms) / sizeof(tvnorm))

static int format2bpp(int format)
{
	int bpp;

	/* Determine the number of bytes per pixel for the video format requested */

	switch (format) {

	case VIDEO_PALETTE_YUV422:
		bpp = 2;
		break;

	case VIDEO_PALETTE_RGB555:
		bpp = 2;
		break;

	case VIDEO_PALETTE_RGB565:
		bpp = 2;
		break;

	case VIDEO_PALETTE_RGB24:
		bpp = 3;
		break;

	case VIDEO_PALETTE_RGB32:
		bpp = 4;
		break;

	default:
		bpp = 0;
	}

	return bpp;
}

/*
 * set geometry
 */
static void zr36057_set_vfe(struct zoran *zr, int video_width, int video_height,
			    unsigned int video_format)
{
	struct tvnorm *tvn;
	unsigned HStart, HEnd, VStart, VEnd;
	unsigned DispMode;
	unsigned VidWinWid, VidWinHt;
	unsigned hcrop1, hcrop2, vcrop1, vcrop2;
	unsigned Wa, We, Ha, He;
	unsigned X, Y, HorDcm, VerDcm;
	u32 reg;
	unsigned mask_line_size;

	if (zr->params.norm < 0 || zr->params.norm > 1) {
		printk(KERN_ERR "%s: set_vfe: video_norm = %d not valid\n", zr->name,  zr->params.norm);
		return;
	}
	if (video_width < BUZ_MIN_WIDTH || video_height < BUZ_MIN_HEIGHT) {
		printk(KERN_ERR "%s: set_vfe: w=%d h=%d not valid\n", zr->name, video_width, video_height);
		return;
	}
	tvn = &tvnorms[zr->params.norm];

	Wa = tvn->Wa;
	Ha = tvn->Ha;

	/* if window has more than half of active height,
	   switch on interlacing - we want the full information */

	zr->video_interlace = (video_height > Ha / 2);

/**** zr36057 ****/

	/* horizontal */
	VidWinWid = video_width;
	X = (VidWinWid * 64 + tvn->Wa - 1) / tvn->Wa;
	We = (VidWinWid * 64) / X;
	HorDcm = 64 - X;
	hcrop1 = 2 * ((tvn->Wa - We) / 4);
	hcrop2 = tvn->Wa - We - hcrop1;
	HStart = tvn->HStart | 1;
	HEnd = HStart + tvn->Wa - 1;
	HStart += hcrop1;
	HEnd -= hcrop2;
	reg = ((HStart & ZR36057_VFEHCR_Hmask) << ZR36057_VFEHCR_HStart)
	    | ((HEnd & ZR36057_VFEHCR_Hmask) << ZR36057_VFEHCR_HEnd);
	reg |= ZR36057_VFEHCR_HSPol;
	btwrite(reg, ZR36057_VFEHCR);

	/* Vertical */
	DispMode = !zr->video_interlace;
	VidWinHt = DispMode ? video_height : video_height / 2;
	Y = (VidWinHt * 64 * 2 + tvn->Ha - 1) / tvn->Ha;
	He = (VidWinHt * 64) / Y;
	VerDcm = 64 - Y;
	vcrop1 = (tvn->Ha / 2 - He) / 2;
	vcrop2 = tvn->Ha / 2 - He - vcrop1;
	VStart = tvn->VStart;
	VEnd = VStart + tvn->Ha / 2 - 1;
	VStart += vcrop1;
	VEnd -= vcrop2;
	reg = ((VStart & ZR36057_VFEVCR_Vmask) << ZR36057_VFEVCR_VStart)
	    | ((VEnd & ZR36057_VFEVCR_Vmask) << ZR36057_VFEVCR_VEnd);
	reg |= ZR36057_VFEVCR_VSPol;
	btwrite(reg, ZR36057_VFEVCR);

	/* scaler and pixel format */
	reg = 0			// ZR36057_VFESPFR_ExtFl /* Trying to live without ExtFl */
	     | (HorDcm << ZR36057_VFESPFR_HorDcm)
	    | (VerDcm << ZR36057_VFESPFR_VerDcm)
	    | (DispMode << ZR36057_VFESPFR_DispMode)
	    | ZR36057_VFESPFR_LittleEndian;
	/* RJ: I don't know, why the following has to be the opposite
	   of the corresponding ZR36060 setting, but only this way
	   we get the correct colors when uncompressing to the screen  */
	reg |= ZR36057_VFESPFR_VCLKPol;
	/* RJ: Don't know if that is needed for NTSC also */
	reg |= ZR36057_VFESPFR_TopField;
	switch (video_format) {

	case VIDEO_PALETTE_YUV422:
		reg |= ZR36057_VFESPFR_YUV422;
		break;

	case VIDEO_PALETTE_RGB555:
		reg |= ZR36057_VFESPFR_RGB555 | ZR36057_VFESPFR_ErrDif;
		break;

	case VIDEO_PALETTE_RGB565:
		reg |= ZR36057_VFESPFR_RGB565 | ZR36057_VFESPFR_ErrDif;
		break;

	case VIDEO_PALETTE_RGB24:
		reg |= ZR36057_VFESPFR_RGB888 | ZR36057_VFESPFR_Pack24;
		break;

	case VIDEO_PALETTE_RGB32:
		reg |= ZR36057_VFESPFR_RGB888;
		break;

	default:
		printk(KERN_INFO "%s: Unknown color_fmt=%x\n", zr->name, video_format);
		return;

	}
	if (HorDcm >= 48) {
		reg |= 3 << ZR36057_VFESPFR_HFilter;	/* 5 tap filter */
	} else if (HorDcm >= 32) {
		reg |= 2 << ZR36057_VFESPFR_HFilter;	/* 4 tap filter */
	} else if (HorDcm >= 16) {
		reg |= 1 << ZR36057_VFESPFR_HFilter;	/* 3 tap filter */
	}
	btwrite(reg, ZR36057_VFESPFR);

	/* display configuration */

	reg = (16 << ZR36057_VDCR_MinPix)
	    | (VidWinHt << ZR36057_VDCR_VidWinHt)
	    | (VidWinWid << ZR36057_VDCR_VidWinWid);
	if (triton)
		reg &= ~ZR36057_VDCR_Triton;
	else
		reg |= ZR36057_VDCR_Triton;
	btwrite(reg, ZR36057_VDCR);

	/* Write overlay clipping mask data, but don't enable overlay clipping */
	/* RJ: since this makes only sense on the screen, we use 
	   zr->window.width instead of video_width */

	mask_line_size = (BUZ_MAX_WIDTH + 31) / 32;
	reg = virt_to_bus(zr->overlay_mask);
	btwrite(reg, ZR36057_MMTR);
	reg = virt_to_bus(zr->overlay_mask + mask_line_size);
	btwrite(reg, ZR36057_MMBR);
	reg = mask_line_size - (zr->window.width + 31) / 32;
	if (DispMode == 0)
		reg += mask_line_size;
	reg <<= ZR36057_OCR_MaskStride;
	btwrite(reg, ZR36057_OCR);

}

/*
 * Switch overlay on or off
 */

static void zr36057_overlay(struct zoran *zr, int on)
{
	int fmt, bpp;
	u32 reg;

	if (on) {
		/* do the necessary settings ... */

		btand(~ZR36057_VDCR_VidEn, ZR36057_VDCR);	/* switch it off first */

		switch (zr->buffer.depth) {
		case 15:
			fmt = VIDEO_PALETTE_RGB555;
			bpp = 2;
			break;
		case 16:
			fmt = VIDEO_PALETTE_RGB565;
			bpp = 2;
			break;
		case 24:
			fmt = VIDEO_PALETTE_RGB24;
			bpp = 3;
			break;
		case 32:
			fmt = VIDEO_PALETTE_RGB32;
			bpp = 4;
			break;
		default:
			fmt = 0;
			bpp = 0;
		}

		zr36057_set_vfe(zr, zr->window.width, zr->window.height, fmt);

		/* Start and length of each line MUST be 4-byte aligned.
		   This should be allready checked before the call to this routine.
		   All error messages are internal driver checking only! */

		/* video display top and bottom registers */

		reg = (u32) zr->buffer.base
		    + zr->window.x * bpp
		    + zr->window.y * zr->buffer.bytesperline;
		btwrite(reg, ZR36057_VDTR);
		if (reg & 3)
			printk(KERN_ERR "%s: zr36057_overlay: video_address not aligned\n", zr->name);
		if (zr->video_interlace)
			reg += zr->buffer.bytesperline;
		btwrite(reg, ZR36057_VDBR);

		/* video stride, status, and frame grab register */

		reg = zr->buffer.bytesperline - zr->window.width * bpp;
		if (zr->video_interlace)
			reg += zr->buffer.bytesperline;
		if (reg & 3)
			printk(KERN_ERR "%s: zr36057_overlay: video_stride not aligned\n", zr->name);
		reg = (reg << ZR36057_VSSFGR_DispStride);
		reg |= ZR36057_VSSFGR_VidOvf;	/* clear overflow status */
		btwrite(reg, ZR36057_VSSFGR);

		/* Set overlay clipping */

		if (zr->window.clipcount)
			btor(ZR36057_OCR_OvlEnable, ZR36057_OCR);

		/* ... and switch it on */

		btor(ZR36057_VDCR_VidEn, ZR36057_VDCR);
	} else {
		/* Switch it off */

		btand(~ZR36057_VDCR_VidEn, ZR36057_VDCR);
	}
}

/*
 * The overlay mask has one bit for each pixel on a scan line,
 *  and the maximum window size is BUZ_MAX_WIDTH * BUZ_MAX_HEIGHT pixels.
 */
static void write_overlay_mask(struct zoran *zr, struct video_clip *vp, int count)
{
	unsigned mask_line_size = (BUZ_MAX_WIDTH + 31) / 32;
	u32 *mask;
	int x, y, width, height;
	unsigned i, j, k;
	u32 reg;

	/* fill mask with one bits */
	memset(zr->overlay_mask, ~0, mask_line_size * 4 * BUZ_MAX_HEIGHT);
	reg = 0;

	for (i = 0; i < count; ++i) {
		/* pick up local copy of clip */
		x = vp[i].x;
		y = vp[i].y;
		width = vp[i].width;
		height = vp[i].height;

		/* trim clips that extend beyond the window */
		if (x < 0) {
			width += x;
			x = 0;
		}
		if (y < 0) {
			height += y;
			y = 0;
		}
		if (x + width > zr->window.width) {
			width = zr->window.width - x;
		}
		if (y + height > zr->window.height) {
			height = zr->window.height - y;
		}
		/* ignore degenerate clips */
		if (height <= 0) {
			continue;
		}
		if (width <= 0) {
			continue;
		}
		/* apply clip for each scan line */
		for (j = 0; j < height; ++j) {
			/* reset bit for each pixel */
			/* this can be optimized later if need be */
			mask = zr->overlay_mask + (y + j) * mask_line_size;
			for (k = 0; k < width; ++k) {
				mask[(x + k) / 32] &= ~((u32) 1 << (x + k) % 32);
			}
		}
	}
}

/* Enable/Disable uncompressed memory grabbing of the 36057 */

static void zr36057_set_memgrab(struct zoran *zr, int mode)
{
	if (mode) {
		if (btread(ZR36057_VSSFGR) & (ZR36057_VSSFGR_SnapShot | ZR36057_VSSFGR_FrameGrab))
			printk(KERN_WARNING "%s: zr36057_set_memgrab_on with SnapShot or FrameGrab on ???\n", zr->name);

		/* switch on VSync interrupts */

		btwrite(IRQ_MASK, ZR36057_ISR);		// Clear Interrupts

		btor(ZR36057_ICR_GIRQ0, ZR36057_ICR);

		/* enable SnapShot */

		btor(ZR36057_VSSFGR_SnapShot, ZR36057_VSSFGR);

		/* Set zr36057 video front end  and enable video */

#ifdef XAWTV_HACK
		zr36057_set_vfe(zr, zr->gwidth > 720 ? 720 : zr->gwidth, zr->gheight, zr->gformat);
#else
		zr36057_set_vfe(zr, zr->gwidth, zr->gheight, zr->gformat);
#endif

		zr->v4l_memgrab_active = 1;
	} else {
		zr->v4l_memgrab_active = 0;

		/* switch off VSync interrupts */

		btand(~ZR36057_ICR_GIRQ0, ZR36057_ICR);

		/* reenable grabbing to screen if it was running */

		if (zr->v4l_overlay_active) {
			zr36057_overlay(zr, 1);
		} else {
			btand(~ZR36057_VDCR_VidEn, ZR36057_VDCR);
			btand(~ZR36057_VSSFGR_SnapShot, ZR36057_VSSFGR);
		}
	}
}

static int wait_grab_pending(struct zoran *zr)
{
	unsigned long flags;

	/* wait until all pending grabs are finished */

	if (!zr->v4l_memgrab_active)
		return 0;

	while (zr->v4l_pend_tail != zr->v4l_pend_head) {
		interruptible_sleep_on(&zr->v4l_capq);
		if (signal_pending(current))
			return -ERESTARTSYS;
	}

	spin_lock_irqsave(&zr->lock, flags);
	zr36057_set_memgrab(zr, 0);
	spin_unlock_irqrestore(&zr->lock, flags);

	return 0;
}

/*
 *   V4L Buffer grabbing
 */

static int v4l_grab(struct zoran *zr, struct video_mmap *mp)
{
	unsigned long flags;
	int res, bpp;

	/*
	 * There is a long list of limitations to what is allowed to be grabbed
	 * We don't output error messages her, since some programs (e.g. xawtv)
	 * just try several settings to find out what is valid or not.
	 */

	/* No grabbing outside the buffer range! */

	if (mp->frame >= v4l_nbufs || mp->frame < 0)
		return -EINVAL;

	/* Check size and format of the grab wanted */

	if (mp->height < BUZ_MIN_HEIGHT || mp->width < BUZ_MIN_WIDTH)
		return -EINVAL;
	if (mp->height > BUZ_MAX_HEIGHT || mp->width > BUZ_MAX_WIDTH)
		return -EINVAL;

	bpp = format2bpp(mp->format);
	if (bpp == 0)
		return -EINVAL;

	/* Check against available buffer size */

	if (mp->height * mp->width * bpp > v4l_bufsize)
		return -EINVAL;

	/* The video front end needs 4-byte alinged line sizes */

	if ((bpp == 2 && (mp->width & 1)) || (bpp == 3 && (mp->width & 3)))
		return -EINVAL;

	/*
	 * To minimize the time spent in the IRQ routine, we avoid setting up
	 * the video front end there.
	 * If this grab has different parameters from a running streaming capture
	 * we stop the streaming capture and start it over again.
	 */

	if (zr->v4l_memgrab_active &&
	    (zr->gwidth != mp->width || zr->gheight != mp->height || zr->gformat != mp->format)) {
		res = wait_grab_pending(zr);
		if (res)
			return res;
	}
	zr->gwidth = mp->width;
	zr->gheight = mp->height;
	zr->gformat = mp->format;
	zr->gbpl = bpp * zr->gwidth;


	spin_lock_irqsave(&zr->lock, flags);

	/* make sure a grab isn't going on currently with this buffer */

	switch (zr->v4l_gbuf[mp->frame].state) {

	default:
	case BUZ_STATE_PEND:
		res = -EBUSY;	/* what are you doing? */
		break;

	case BUZ_STATE_USER:
	case BUZ_STATE_DONE:
		/* since there is at least one unused buffer there's room for at least one more pend[] entry */
		zr->v4l_pend[zr->v4l_pend_head++ & V4L_MASK_FRAME] = mp->frame;
		zr->v4l_gbuf[mp->frame].state = BUZ_STATE_PEND;
		res = 0;
		break;

	}

	/* put the 36057 into frame grabbing mode */

	if (!res && !zr->v4l_memgrab_active)
		zr36057_set_memgrab(zr, 1);

	spin_unlock_irqrestore(&zr->lock, flags);

	return res;
}

/*
 * Sync on a V4L buffer
 */

static int v4l_sync(struct zoran *zr, int frame)
{
	unsigned long flags;


	/* check passed-in frame number */
	if (frame >= v4l_nbufs || frame < 0) {
		printk(KERN_ERR "%s: v4l_sync: frame %d is invalid\n", zr->name, frame);
		return -EINVAL;
	}
	/* Check if is buffer was queued at all */

	if (zr->v4l_gbuf[frame].state == BUZ_STATE_USER) {
//		printk(KERN_ERR "%s: v4l_sync: Trying to sync on a buffer which was not queued?\n", zr->name);
		return -EINVAL;
	}
	/* wait on this buffer to get ready */

	while (zr->v4l_gbuf[frame].state == BUZ_STATE_PEND) {
		interruptible_sleep_on(&zr->v4l_capq);
		if (signal_pending(current))
			return -ERESTARTSYS;
	}

	/* buffer should now be in BUZ_STATE_DONE */

	if (zr->v4l_gbuf[frame].state != BUZ_STATE_DONE)
		printk(KERN_ERR "%s: v4l_sync - internal error\n", zr->name);

	/* Check if streaming capture has finished */

	spin_lock_irqsave(&zr->lock, flags);

	if (zr->v4l_pend_tail == zr->v4l_pend_head)
		zr36057_set_memgrab(zr, 0);

	spin_unlock_irqrestore(&zr->lock, flags);

	return 0;
}
/*****************************************************************************
 *                                                                           *
 *  Set up the Buz-specific MJPEG part                                       *
 *                                                                           *
 *****************************************************************************/

/*
 *	Wait til post office is no longer busy 
 */
 
static int post_office_wait(struct zoran *zr)
{
	u32 por;
	u32 ct=0;

	while (((por = btread(ZR36057_POR)) & (ZR36057_POR_POPen | ZR36057_POR_POTime)) == ZR36057_POR_POPen) {
		ct++;
		if(ct>100000)
		{
			printk(KERN_ERR "%s: timeout on post office.\n", zr->name);
			return -1;
		}
		/* wait for something to happen */
	}
	if ((por & ZR36057_POR_POPen) != 0) {
		printk(KERN_WARNING "%s: pop pending %08x\n", zr->name, por);
		return -1;
	}
	if ((por & (ZR36057_POR_POTime | ZR36057_POR_POPen)) != 0) {
		printk(KERN_WARNING "%s: pop timeout %08x\n", zr->name, por);
		return -1;
	}
	return 0;
}

static int post_office_write(struct zoran *zr, unsigned guest, unsigned reg, unsigned value)
{
	u32 por;

	post_office_wait(zr);
	por = ZR36057_POR_PODir | ZR36057_POR_POTime | ((guest & 7) << 20) | ((reg & 7) << 16) | (value & 0xFF);
	btwrite(por, ZR36057_POR);
	return post_office_wait(zr);
}

static int post_office_read(struct zoran *zr, unsigned guest, unsigned reg)
{
	u32 por;

	post_office_wait(zr);
	por = ZR36057_POR_POTime | ((guest & 7) << 20) | ((reg & 7) << 16);
	btwrite(por, ZR36057_POR);
	if (post_office_wait(zr) < 0) {
		return -1;
	}
	return btread(ZR36057_POR) & 0xFF;
}

static int zr36060_write_8(struct zoran *zr, unsigned reg, unsigned val)
{
	if (post_office_wait(zr)
	    || post_office_write(zr, 0, 1, reg >> 8)
	    || post_office_write(zr, 0, 2, reg)) {
		return -1;
	}
	return post_office_write(zr, 0, 3, val);
}

static int zr36060_write_16(struct zoran *zr, unsigned reg, unsigned val)
{
	if (zr36060_write_8(zr, reg + 0, val >> 8)) {
		return -1;
	}
	return zr36060_write_8(zr, reg + 1, val >> 0);
}

static int zr36060_write_24(struct zoran *zr, unsigned reg, unsigned val)
{
	if (zr36060_write_8(zr, reg + 0, val >> 16)) {
		return -1;
	}
	return zr36060_write_16(zr, reg + 1, val >> 0);
}

static int zr36060_write_32(struct zoran *zr, unsigned reg, unsigned val)
{
	if (zr36060_write_16(zr, reg + 0, val >> 16)) {
		return -1;
	}
	return zr36060_write_16(zr, reg + 2, val >> 0);
}

static u32 zr36060_read_8(struct zoran *zr, unsigned reg)
{
	if (post_office_wait(zr)
	    || post_office_write(zr, 0, 1, reg >> 8)
	    || post_office_write(zr, 0, 2, reg)) {
		return -1;
	}
	return post_office_read(zr, 0, 3) & 0xFF;
}

static int zr36060_reset(struct zoran *zr)
{
	return post_office_write(zr, 3, 0, 0);
}

static void zr36060_sleep(struct zoran *zr, int sleep)
{
	GPIO(zr, 1, !sleep);
}


static void zr36060_set_jpg(struct zoran *zr, enum zoran_codec_mode mode)
{
	struct tvnorm *tvn;
	u32 reg;
	int size;

	reg = (1 << 0)		/* CodeMstr */
	    |(0 << 2)		/* CFIS=0 */
	    |(0 << 6)		/* Endian=0 */
	    |(0 << 7);		/* Code16=0 */
	zr36060_write_8(zr, 0x002, reg);

	switch (mode) {

	case BUZ_MODE_MOTION_DECOMPRESS:
	case BUZ_MODE_STILL_DECOMPRESS:
		reg = 0x00;	/* Codec mode = decompression */
		break;

	case BUZ_MODE_MOTION_COMPRESS:
	case BUZ_MODE_STILL_COMPRESS:
	default:
		reg = 0xa4;	/* Codec mode = compression with variable scale factor */
		break;

	}
	zr36060_write_8(zr, 0x003, reg);

	reg = 0x00;		/* reserved, mbz */
	zr36060_write_8(zr, 0x004, reg);

	reg = 0xff;		/* 510 bits/block */
	zr36060_write_8(zr, 0x005, reg);

	/* JPEG markers */
	reg = (zr->params.jpeg_markers) & 0x38;	/* DRI, DQT, DHT */
	if (zr->params.COM_len)
		reg |= JPEG_MARKER_COM;
	if (zr->params.APP_len)
		reg |= JPEG_MARKER_APP;
	zr36060_write_8(zr, 0x006, reg);

	reg = (0 << 3)		/* DATERR=0 */
	    |(0 << 2)		/* END=0 */
	    |(0 << 1)		/* EOI=0 */
	    |(0 << 0);		/* EOAV=0 */
	zr36060_write_8(zr, 0x007, reg);

	/* code volume */

	/* Target field size in pixels: */
	tvn = &tvnorms[zr->params.norm];
	size = (tvn->Ha / 2) * (tvn->Wa) / (zr->params.HorDcm) / (zr->params.VerDcm);

	/* Target compressed field size in bits: */
	size = size * 16;	/* uncompressed size in bits */
	size = size * zr->params.quality / 400;	/* quality = 100 is a compression ratio 1:4 */

	/* Lower limit (arbitrary, 1 KB) */
	if (size < 8192)
		size = 8192;

	/* Upper limit: 7/8 of the code buffers */
	if (size * zr->params.field_per_buff > zr->jpg_bufsize * 7)
		size = zr->jpg_bufsize * 7 / zr->params.field_per_buff;

	reg = size;
	zr36060_write_32(zr, 0x009, reg);

	/* how do we set initial SF as a function of quality parameter? */
	reg = 0x0100;		/* SF=1.0 */
	zr36060_write_16(zr, 0x011, reg);

	reg = 0x00ffffff;	/* AF=max */
	zr36060_write_24(zr, 0x013, reg);

	reg = 0x0000;		/* test */
	zr36060_write_16(zr, 0x024, reg);
}

static void zr36060_set_video(struct zoran *zr, enum zoran_codec_mode mode)
{
	struct tvnorm *tvn;
	u32 reg;

	reg = (0 << 7)		/* Video8=0 */
	    |(0 << 6)		/* Range=0 */
	    |(0 << 3)		/* FlDet=0 */
	    |(1 << 2)		/* FlVedge=1 */
	    |(0 << 1)		/* FlExt=0 */
	    |(0 << 0);		/* SyncMstr=0 */

	/* According to ZR36067 documentation, FlDet should correspond
	   to the odd_even flag of the ZR36067 */
	if (zr->params.odd_even)
		reg |= (1 << 3);

	if (mode != BUZ_MODE_STILL_DECOMPRESS) {
		/* limit pixels to range 16..235 as per CCIR-601 */
		reg |= (1 << 6);	/* Range=1 */
	}
	zr36060_write_8(zr, 0x030, reg);

	reg = (0 << 7)		/* VCLKPol=0 */
	    |(0 << 6)		/* PValPol=0 */
	    |(1 << 5)		/* PoePol=1 */
	    |(0 << 4)		/* SImgPol=0 */
	    |(0 << 3)		/* BLPol=0 */
	    |(0 << 2)		/* FlPol=0 */
	    |(0 << 1)		/* HSPol=0, sync on falling edge */
	    |(1 << 0);		/* VSPol=1 */
	zr36060_write_8(zr, 0x031, reg);

	switch (zr->params.HorDcm) {
	default:
	case 1:
		reg = (0 << 0);
		break;		/* HScale = 0 */

	case 2:
		reg = (1 << 0);
		break;		/* HScale = 1 */

	case 4:
		reg = (2 << 0);
		break;		/* HScale = 2 */
	}
	if (zr->params.VerDcm == 2)
		reg |= (1 << 2);
	zr36060_write_8(zr, 0x032, reg);

	reg = 0x80;		/* BackY */
	zr36060_write_8(zr, 0x033, reg);

	reg = 0xe0;		/* BackU */
	zr36060_write_8(zr, 0x034, reg);

	reg = 0xe0;		/* BackV */
	zr36060_write_8(zr, 0x035, reg);

	/* sync generator */

	tvn = &tvnorms[zr->params.norm];

	reg = tvn->Ht - 1;	/* Vtotal */
	zr36060_write_16(zr, 0x036, reg);

	reg = tvn->Wt - 1;	/* Htotal */
	zr36060_write_16(zr, 0x038, reg);

	reg = 6 - 1;		/* VsyncSize */
	zr36060_write_8(zr, 0x03a, reg);

	reg = 100 - 1;		/* HsyncSize */
	zr36060_write_8(zr, 0x03b, reg);

	reg = tvn->VStart - 1;	/* BVstart */
	zr36060_write_8(zr, 0x03c, reg);

	reg += tvn->Ha / 2;	/* BVend */
	zr36060_write_16(zr, 0x03e, reg);

	reg = tvn->HStart - 1;	/* BHstart */
	zr36060_write_8(zr, 0x03d, reg);

	reg += tvn->Wa;		/* BHend */
	zr36060_write_16(zr, 0x040, reg);

	/* active area */
	reg = zr->params.img_y + tvn->VStart;	/* Vstart */
	zr36060_write_16(zr, 0x042, reg);

	reg += zr->params.img_height;	/* Vend */
	zr36060_write_16(zr, 0x044, reg);

	reg = zr->params.img_x + tvn->HStart;	/* Hstart */
	zr36060_write_16(zr, 0x046, reg);

	reg += zr->params.img_width;	/* Hend */
	zr36060_write_16(zr, 0x048, reg);

	/* subimage area */
	reg = zr->params.img_y + tvn->VStart;	/* SVstart */
	zr36060_write_16(zr, 0x04a, reg);

	reg += zr->params.img_height;	/* SVend */
	zr36060_write_16(zr, 0x04c, reg);

	reg = zr->params.img_x + tvn->HStart;	/* SHstart */
	zr36060_write_16(zr, 0x04e, reg);

	reg += zr->params.img_width;	/* SHend */
	zr36060_write_16(zr, 0x050, reg);
}

static void zr36060_set_jpg_SOF(struct zoran *zr)
{
	u32 reg;


	reg = 0xffc0;		/* SOF marker */
	zr36060_write_16(zr, 0x060, reg);

	reg = 17;		/* SOF length */
	zr36060_write_16(zr, 0x062, reg);

	reg = 8;		/* precision 8 bits */
	zr36060_write_8(zr, 0x064, reg);

	reg = zr->params.img_height / zr->params.VerDcm;	/* image height */
	zr36060_write_16(zr, 0x065, reg);

	reg = zr->params.img_width / zr->params.HorDcm;	/* image width */
	zr36060_write_16(zr, 0x067, reg);

	reg = 3;		/* 3 color components */
	zr36060_write_8(zr, 0x069, reg);

	reg = 0x002100;		/* Y component */
	zr36060_write_24(zr, 0x06a, reg);

	reg = 0x011101;		/* U component */
	zr36060_write_24(zr, 0x06d, reg);

	reg = 0x021101;		/* V component */
	zr36060_write_24(zr, 0x070, reg);
}

static void zr36060_set_jpg_SOS(struct zoran *zr)
{
	u32 reg;


	reg = 0xffda;		/* SOS marker */
	zr36060_write_16(zr, 0x07a, reg);

	reg = 12;		/* SOS length */
	zr36060_write_16(zr, 0x07c, reg);

	reg = 3;		/* 3 color components */
	zr36060_write_8(zr, 0x07e, reg);

	reg = 0x0000;		/* Y component */
	zr36060_write_16(zr, 0x07f, reg);

	reg = 0x0111;		/* U component */
	zr36060_write_16(zr, 0x081, reg);

	reg = 0x0211;		/* V component */
	zr36060_write_16(zr, 0x083, reg);

	reg = 0x003f00;		/* Start, end spectral scans */
	zr36060_write_24(zr, 0x085, reg);
}

static void zr36060_set_jpg_DRI(struct zoran *zr)
{
	u32 reg;


	reg = 0xffdd;		/* DRI marker */
	zr36060_write_16(zr, 0x0c0, reg);

	reg = 4;		/* DRI length */
	zr36060_write_16(zr, 0x0c2, reg);

	reg = 8;		/* length in MCUs */
	zr36060_write_16(zr, 0x0c4, reg);
}

static void zr36060_set_jpg_DQT(struct zoran *zr)
{
	unsigned i;
	unsigned adr;
	static const u8 dqt[] =
	{
		0xff, 0xdb,	/* DHT marker */
		0x00, 0x84,	/* DHT length */
		0x00,		/* table ID 0 */
		0x10, 0x0b, 0x0c, 0x0e, 0x0c, 0x0a, 0x10, 0x0e,
		0x0d, 0x0e, 0x12, 0x11, 0x10, 0x13, 0x18, 0x28,
		0x1a, 0x18, 0x16, 0x16, 0x18, 0x31, 0x23, 0x25,
		0x1d, 0x28, 0x3a, 0x33, 0x3d, 0x3c, 0x39, 0x33,
		0x38, 0x37, 0x40, 0x48, 0x5c, 0x4e, 0x40, 0x44,
		0x57, 0x45, 0x37, 0x38, 0x50, 0x6d, 0x51, 0x57,
		0x5f, 0x62, 0x67, 0x68, 0x67, 0x3e, 0x4d, 0x71,
		0x79, 0x70, 0x64, 0x78, 0x5c, 0x65, 0x67, 0x63,
		0x01,		/* table ID 1 */
		0x11, 0x12, 0x12, 0x18, 0x15, 0x18, 0x2f, 0x1a,
		0x1a, 0x2f, 0x63, 0x42, 0x38, 0x42, 0x63, 0x63,
		0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
		0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
		0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
		0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
		0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
		0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63
	};

	/* write fixed quantitization tables */
	adr = 0x0cc;
	for (i = 0; i < sizeof(dqt); ++i) {
		zr36060_write_8(zr, adr++, dqt[i]);
	}
}

static void zr36060_set_jpg_DHT(struct zoran *zr)
{
	unsigned i;
	unsigned adr;
	static const u8 dht[] =
	{
		0xff, 0xc4,	/* DHT marker */
		0x01, 0xa2,	/* DHT length */
		0x00,		/* table class 0, ID 0 */
		0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01,		/* # codes of length 1..8 */
		0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,		/* # codes of length 8..16 */
		0x00,		/* values for codes of length 2 */
		0x01, 0x02, 0x03, 0x04, 0x05,	/* values for codes of length 3 */
		0x06,		/* values for codes of length 4 */
		0x07,		/* values for codes of length 5 */
		0x08,		/* values for codes of length 6 */
		0x09,		/* values for codes of length 7 */
		0x0a,		/* values for codes of length 8 */
		0x0b,		/* values for codes of length 9 */
		0x01,		/* table class 0, ID 1 */
		0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,		/* # codes of length 1..8 */
		0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,		/* # codes of length 9..16 */
		0x00, 0x01, 0x02,	/* values for codes of length 2 */
		0x03,		/* values for codes of length 3 */
		0x04,		/* values for codes of length 4 */
		0x05,		/* values for codes of length 5 */
		0x06,		/* values for codes of length 6 */
		0x07,		/* values for codes of length 7 */
		0x08,		/* values for codes of length 8 */
		0x09,		/* values for codes of length 9 */
		0x0a,		/* values for codes of length 10 */
		0x0b,		/* values for codes of length 11 */
		0x10,
		0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03,
		0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7d,
		0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
		0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
		0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
		0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
		0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
		0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
		0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
		0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
		0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
		0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
		0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
		0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
		0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
		0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
		0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
		0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
		0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
		0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
		0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
		0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
		0xf9, 0xfa, 0x11, 0x00, 0x02, 0x01, 0x02, 0x04,
		0x04, 0x03, 0x04, 0x07, 0x05, 0x04, 0x04, 0x00,
		0x01, 0x02, 0x77, 0x00, 0x01, 0x02, 0x03, 0x11,
		0x04, 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51,
		0x07, 0x61, 0x71, 0x13, 0x22, 0x32, 0x81, 0x08,
		0x14, 0x42, 0x91, 0xa1, 0xb1, 0xc1, 0x09, 0x23,
		0x33, 0x52, 0xf0, 0x15, 0x62, 0x72, 0xd1, 0x0a,
		0x16, 0x24, 0x34, 0xe1, 0x25, 0xf1, 0x17, 0x18,
		0x19, 0x1a, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x35,
		0x36, 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45,
		0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55,
		0x56, 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65,
		0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75,
		0x76, 0x77, 0x78, 0x79, 0x7a, 0x82, 0x83, 0x84,
		0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93,
		0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2,
		0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa,
		0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9,
		0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8,
		0xc9, 0xca, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
		0xd8, 0xd9, 0xda, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6,
		0xe7, 0xe8, 0xe9, 0xea, 0xf2, 0xf3, 0xf4, 0xf5,
		0xf6, 0xf7, 0xf8, 0xf9, 0xfa
	};

	/* write fixed Huffman tables */
	adr = 0x1d4;
	for (i = 0; i < sizeof(dht); ++i) {
		zr36060_write_8(zr, adr++, dht[i]);
	}
}

static void zr36060_set_jpg_APP(struct zoran *zr)
{
	unsigned adr;
	int len, i;
	u32 reg;


	len = zr->params.APP_len;
	if (len < 0)
		len = 0;
	if (len > 60)
		len = 60;

	i = zr->params.APPn;
	if (i < 0)
		i = 0;
	if (i > 15)
		i = 15;

	reg = 0xffe0 + i;	/* APPn marker */
	zr36060_write_16(zr, 0x380, reg);

	reg = len + 2;		/* APPn len */
	zr36060_write_16(zr, 0x382, reg);

	/* write APPn data */
	adr = 0x384;
	for (i = 0; i < 60; i++) {
		zr36060_write_8(zr, adr++, (i < len ? zr->params.APP_data[i] : 0));
	}
}

static void zr36060_set_jpg_COM(struct zoran *zr)
{
	unsigned adr;
	int len, i;
	u32 reg;


	len = zr->params.COM_len;
	if (len < 0)
		len = 0;
	if (len > 60)
		len = 60;

	reg = 0xfffe;		/* COM marker */
	zr36060_write_16(zr, 0x3c0, reg);

	reg = len + 2;		/* COM len */
	zr36060_write_16(zr, 0x3c2, reg);

	/* write COM data */
	adr = 0x3c4;
	for (i = 0; i < 60; i++) {
		zr36060_write_8(zr, adr++, (i < len ? zr->params.COM_data[i] : 0));
	}
}

static void zr36060_set_cap(struct zoran *zr, enum zoran_codec_mode mode)
{
	unsigned i;
	u32 reg;

	zr36060_reset(zr);
	mdelay(10);

	reg = (0 << 7)		/* Load=0 */
	    |(1 << 0);		/* SynRst=1 */
	zr36060_write_8(zr, 0x000, reg);

	zr36060_set_jpg(zr, mode);
	zr36060_set_video(zr, mode);
	zr36060_set_jpg_SOF(zr);
	zr36060_set_jpg_SOS(zr);
	zr36060_set_jpg_DRI(zr);
	zr36060_set_jpg_DQT(zr);
	zr36060_set_jpg_DHT(zr);
	zr36060_set_jpg_APP(zr);
	zr36060_set_jpg_COM(zr);

	reg = (1 << 7)		/* Load=1 */
	    |(0 << 0);		/* SynRst=0 */
	zr36060_write_8(zr, 0x000, reg);

	/* wait for codec to unbusy */
	for (i = 0; i < 1000; ++i) {
		reg = zr36060_read_8(zr, 0x001);
		if ((reg & (1 << 7)) == 0) {
			DEBUG(printk(KERN_DEBUG "060: loaded, loops=%u\n", i));
			return;
		}
		udelay(1000);
	}
	printk(KERN_INFO "060: stuck busy, statux=%02x\n", reg);
}

static void zr36057_set_jpg(struct zoran *zr, enum zoran_codec_mode mode)
{
	struct tvnorm *tvn;
	u32 reg;
	int i;

	tvn = &tvnorms[zr->params.norm];

	/* assert P_Reset */
	btwrite(0, ZR36057_JPC);

	/* re-initialize DMA ring stuff */
	zr->jpg_que_head = 0;
	zr->jpg_dma_head = 0;
	zr->jpg_dma_tail = 0;
	zr->jpg_que_tail = 0;
	zr->jpg_seq_num = 0;
	for (i = 0; i < BUZ_NUM_STAT_COM; ++i) {
		zr->stat_com[i] = 1;	/* mark as unavailable to zr36057 */
	}
	for (i = 0; i < zr->jpg_nbufs; i++) {
		zr->jpg_gbuf[i].state = BUZ_STATE_USER;	/* nothing going on */
	}

	/* MJPEG compression mode */
	switch (mode) {

	case BUZ_MODE_MOTION_COMPRESS:
	default:
		reg = ZR36057_JMC_MJPGCmpMode;
		break;

	case BUZ_MODE_MOTION_DECOMPRESS:
		reg = ZR36057_JMC_MJPGExpMode;
		reg |= ZR36057_JMC_SyncMstr;
		/* RJ: The following is experimental - improves the output to screen */
		if (zr->params.VFIFO_FB)
			reg |= ZR36057_JMC_VFIFO_FB;
		break;

	case BUZ_MODE_STILL_COMPRESS:
		reg = ZR36057_JMC_JPGCmpMode;
		break;

	case BUZ_MODE_STILL_DECOMPRESS:
		reg = ZR36057_JMC_JPGExpMode;
		break;

	}
	reg |= ZR36057_JMC_JPG;
	if (zr->params.field_per_buff == 1)
		reg |= ZR36057_JMC_Fld_per_buff;
	btwrite(reg, ZR36057_JMC);

	/* vertical */
	btor(ZR36057_VFEVCR_VSPol, ZR36057_VFEVCR);
	reg = (6 << ZR36057_VSP_VsyncSize) | (tvn->Ht << ZR36057_VSP_FrmTot);
	btwrite(reg, ZR36057_VSP);
	reg = ((zr->params.img_y + tvn->VStart) << ZR36057_FVAP_NAY)
	    | (zr->params.img_height << ZR36057_FVAP_PAY);
	btwrite(reg, ZR36057_FVAP);

	/* horizontal */
	btor(ZR36057_VFEHCR_HSPol, ZR36057_VFEHCR);
	reg = ((tvn->Wt - 100) << ZR36057_HSP_HsyncStart) | (tvn->Wt << ZR36057_HSP_LineTot);
	btwrite(reg, ZR36057_HSP);
	reg = ((zr->params.img_x + tvn->HStart) << ZR36057_FHAP_NAX)
	    | (zr->params.img_width << ZR36057_FHAP_PAX);
	btwrite(reg, ZR36057_FHAP);

	/* field process parameters */
	if (zr->params.odd_even)
		reg = ZR36057_FPP_Odd_Even;
	else
		reg = 0;
	btwrite(reg, ZR36057_FPP);

	/* Set proper VCLK Polarity, else colors will be wrong during playback */
	btor(ZR36057_VFESPFR_VCLKPol, ZR36057_VFESPFR);

	/* code base address and FIFO threshold */
	reg = virt_to_bus(zr->stat_com);
	btwrite(reg, ZR36057_JCBA);
	reg = 0x50;
	btwrite(reg, ZR36057_JCFT);

	/* JPEG codec guest ID */
	reg = (1 << ZR36057_JCGI_JPEGuestID) | (0 << ZR36057_JCGI_JPEGuestReg);
	btwrite(reg, ZR36057_JCGI);

	/* Code transfer guest ID */
	reg = (0 << ZR36057_MCTCR_CodGuestID) | (3 << ZR36057_MCTCR_CodGuestReg);
	reg |= ZR36057_MCTCR_CFlush;
	btwrite(reg, ZR36057_MCTCR);

	/* deassert P_Reset */
	btwrite(ZR36057_JPC_P_Reset, ZR36057_JPC);
}

static void zr36057_enable_jpg(struct zoran *zr, enum zoran_codec_mode mode)
{
	static int zero = 0;
	static int one = 1;

	switch (mode) {

	case BUZ_MODE_MOTION_COMPRESS:
		zr36060_set_cap(zr, mode);
		zr36057_set_jpg(zr, mode);
		i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_ENABLE_OUTPUT, &one);
		i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEOENCODER, ENCODER_SET_INPUT, &zero);

		/* deassert P_Reset, assert Code transfer enable */
		btwrite(IRQ_MASK, ZR36057_ISR);
		btand(~ZR36057_MCTCR_CFlush, ZR36057_MCTCR);
		break;

	case BUZ_MODE_MOTION_DECOMPRESS:
		i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_ENABLE_OUTPUT, &zero);
		i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEOENCODER, ENCODER_SET_INPUT, &one);
		zr36060_set_cap(zr, mode);
		zr36057_set_jpg(zr, mode);

		/* deassert P_Reset, assert Code transfer enable */
		btwrite(IRQ_MASK, ZR36057_ISR);
		btand(~ZR36057_MCTCR_CFlush, ZR36057_MCTCR);
		break;

	case BUZ_MODE_IDLE:
	default:
		/* shut down processing */
		btor(ZR36057_MCTCR_CFlush, ZR36057_MCTCR);
		btwrite(ZR36057_JPC_P_Reset, ZR36057_JPC);
		btand(~ZR36057_JMC_VFIFO_FB, ZR36057_JMC);
		btand(~ZR36057_JMC_SyncMstr, ZR36057_JMC);
		btand(~ZR36057_JMC_Go_en, ZR36057_JMC);
		btwrite(0, ZR36057_ISR);
		zr36060_reset(zr);
		i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_ENABLE_OUTPUT, &one);
		i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEOENCODER, ENCODER_SET_INPUT, &zero);
		break;

	}
	zr->codec_mode = mode;
}

/*
 *   Queue a MJPEG buffer for capture/playback
 */

static int jpg_qbuf(struct zoran *zr, int frame, enum zoran_codec_mode mode)
{
	unsigned long flags;
	int res;

	/* Check if buffers are allocated */

	if (!zr->jpg_buffers_allocated) {
		printk(KERN_ERR "%s: jpg_qbuf: buffers not yet allocated\n", zr->name);
		return -ENOMEM;
	}
	/* Does the user want to stop streaming? */

	if (frame < 0) {
		if (zr->codec_mode == mode) {
			zr36057_enable_jpg(zr, BUZ_MODE_IDLE);
			return 0;
		} else {
			printk(KERN_ERR "%s: jpg_qbuf - stop streaming but not in streaming mode\n", zr->name);
			return -EINVAL;
		}
	}
	/* No grabbing outside the buffer range! */

	if (frame >= zr->jpg_nbufs) {
		printk(KERN_ERR "%s: jpg_qbuf: buffer %d out of range\n", zr->name, frame);
		return -EINVAL;
	}
	/* what is the codec mode right now? */

	if (zr->codec_mode == BUZ_MODE_IDLE) {
		/* Ok load up the zr36060 and go */
		zr36057_enable_jpg(zr, mode);
	} else if (zr->codec_mode != mode) {
		/* wrong codec mode active - invalid */
		printk(KERN_ERR "%s: jpg_qbuf - codec in wrong mode\n", zr->name);
		return -EINVAL;
	}
	spin_lock_irqsave(&zr->lock, flags);

	/* make sure a grab isn't going on currently with this buffer */

	switch (zr->jpg_gbuf[frame].state) {

	default:
	case BUZ_STATE_DMA:
	case BUZ_STATE_PEND:
	case BUZ_STATE_DONE:
		res = -EBUSY;	/* what are you doing? */
		break;

	case BUZ_STATE_USER:
		/* since there is at least one unused buffer there's room for at least one more pend[] entry */
		zr->jpg_pend[zr->jpg_que_head++ & BUZ_MASK_FRAME] = frame;
		zr->jpg_gbuf[frame].state = BUZ_STATE_PEND;
		zoran_feed_stat_com(zr);
		res = 0;
		break;

	}

	spin_unlock_irqrestore(&zr->lock, flags);

	/* Start the zr36060 when the first frame is queued  */
	if (zr->jpg_que_head == 1) {
		btor(ZR36057_JMC_Go_en, ZR36057_JMC);
		btwrite(ZR36057_JPC_P_Reset | ZR36057_JPC_CodTrnsEn | ZR36057_JPC_Active, ZR36057_JPC);
	}
	return res;
}

/*
 *   Sync on a MJPEG buffer
 */

static int jpg_sync(struct zoran *zr, struct zoran_sync *bs)
{
	unsigned long flags;
	int frame;

	if (zr->codec_mode != BUZ_MODE_MOTION_DECOMPRESS &&
	    zr->codec_mode != BUZ_MODE_MOTION_COMPRESS) {
		return -EINVAL;
	}
	while (zr->jpg_que_tail == zr->jpg_dma_tail) {
		interruptible_sleep_on(&zr->jpg_capq);
		if (signal_pending(current))
			return -ERESTARTSYS;
	}

	spin_lock_irqsave(&zr->lock, flags);

	frame = zr->jpg_pend[zr->jpg_que_tail++ & BUZ_MASK_FRAME];

	/* buffer should now be in BUZ_STATE_DONE */

	if (zr->jpg_gbuf[frame].state != BUZ_STATE_DONE)
		printk(KERN_ERR "%s: jpg_sync - internal error\n", zr->name);

	*bs = zr->jpg_gbuf[frame].bs;
	zr->jpg_gbuf[frame].state = BUZ_STATE_USER;

	spin_unlock_irqrestore(&zr->lock, flags);

	return 0;
}

/* when this is called the spinlock must be held */
static void zoran_feed_stat_com(struct zoran *zr)
{
	/* move frames from pending queue to DMA */

	int frame, i, max_stat_com;

	max_stat_com = (zr->params.TmpDcm == 1) ? BUZ_NUM_STAT_COM : (BUZ_NUM_STAT_COM >> 1);

	while ((zr->jpg_dma_head - zr->jpg_dma_tail) < max_stat_com
	       && zr->jpg_dma_head != zr->jpg_que_head) {

		frame = zr->jpg_pend[zr->jpg_dma_head & BUZ_MASK_FRAME];
		if (zr->params.TmpDcm == 1) {
			/* fill 1 stat_com entry */
			i = zr->jpg_dma_head & BUZ_MASK_STAT_COM;
			zr->stat_com[i] = zr->jpg_gbuf[frame].frag_tab_bus;
		} else {
			/* fill 2 stat_com entries */
			i = (zr->jpg_dma_head & 1) * 2;
			zr->stat_com[i] = zr->jpg_gbuf[frame].frag_tab_bus;
			zr->stat_com[i + 1] = zr->jpg_gbuf[frame].frag_tab_bus;
		}
		zr->jpg_gbuf[frame].state = BUZ_STATE_DMA;
		zr->jpg_dma_head++;

	}
}

/* when this is called the spinlock must be held */
static void zoran_reap_stat_com(struct zoran *zr)
{
	/* move frames from DMA queue to done queue */

	int i;
	u32 stat_com;
	unsigned int seq;
	unsigned int dif;
	int frame;
	struct zoran_gbuffer *gbuf;

	/* In motion decompress we don't have a hardware frame counter,
	   we just count the interrupts here */

	if (zr->codec_mode == BUZ_MODE_MOTION_DECOMPRESS)
		zr->jpg_seq_num++;

	while (zr->jpg_dma_tail != zr->jpg_dma_head) {
		if (zr->params.TmpDcm == 1)
			i = zr->jpg_dma_tail & BUZ_MASK_STAT_COM;
		else
			i = (zr->jpg_dma_tail & 1) * 2 + 1;

		stat_com = zr->stat_com[i];

		if ((stat_com & 1) == 0) {
			return;
		}
		frame = zr->jpg_pend[zr->jpg_dma_tail & BUZ_MASK_FRAME];
		gbuf = &zr->jpg_gbuf[frame];
		get_fast_time(&gbuf->bs.timestamp);

		if (zr->codec_mode == BUZ_MODE_MOTION_COMPRESS) {
			gbuf->bs.length = (stat_com & 0x7fffff) >> 1;

			/* update sequence number with the help of the counter in stat_com */

			seq = stat_com >> 24;
			dif = (seq - zr->jpg_seq_num) & 0xff;
			zr->jpg_seq_num += dif;
		} else {
			gbuf->bs.length = 0;
		}
		gbuf->bs.seq = zr->params.TmpDcm == 2 ? (zr->jpg_seq_num >> 1) : zr->jpg_seq_num;
		gbuf->state = BUZ_STATE_DONE;

		zr->jpg_dma_tail++;
	}
}

static void zoran_irq(int irq, void *dev_id, struct pt_regs *regs)
{
	u32 stat, astat;
	int count;
	struct zoran *zr;
	unsigned long flags;

	zr = (struct zoran *) dev_id;
	count = 0;

	spin_lock_irqsave(&zr->lock, flags);
	while (1) {
		/* get/clear interrupt status bits */
		stat = btread(ZR36057_ISR);
		astat = stat & IRQ_MASK;
		if (!astat) {
			break;
		}
		btwrite(astat, ZR36057_ISR);
		IDEBUG(printk(BUZ_DEBUG "-%u: astat %08x stat %08x\n", zr->id, astat, stat));

#if (IRQ_MASK & ZR36057_ISR_GIRQ0)
		if (astat & ZR36057_ISR_GIRQ0) {

			/* Interrupts may still happen when zr->v4l_memgrab_active is switched off.
			   We simply ignore them */

			if (zr->v4l_memgrab_active) {

/* A lot more checks should be here ... */
				if ((btread(ZR36057_VSSFGR) & ZR36057_VSSFGR_SnapShot) == 0)
					printk(KERN_WARNING "%s: BuzIRQ with SnapShot off ???\n", zr->name);

				if (zr->v4l_grab_frame != NO_GRAB_ACTIVE) {
					/* There is a grab on a frame going on, check if it has finished */

					if ((btread(ZR36057_VSSFGR) & ZR36057_VSSFGR_FrameGrab) == 0) {
						/* it is finished, notify the user */

						zr->v4l_gbuf[zr->v4l_grab_frame].state = BUZ_STATE_DONE;
						zr->v4l_grab_frame = NO_GRAB_ACTIVE;
						zr->v4l_grab_seq++;
						zr->v4l_pend_tail++;
					}
				}
				if (zr->v4l_grab_frame == NO_GRAB_ACTIVE)
					wake_up_interruptible(&zr->v4l_capq);

				/* Check if there is another grab queued */

				if (zr->v4l_grab_frame == NO_GRAB_ACTIVE &&
				    zr->v4l_pend_tail != zr->v4l_pend_head) {

					int frame = zr->v4l_pend[zr->v4l_pend_tail & V4L_MASK_FRAME];
					u32 reg;

					zr->v4l_grab_frame = frame;

					/* Set zr36057 video front end and enable video */

					/* Buffer address */

					reg = zr->v4l_gbuf[frame].fbuffer_bus;
					btwrite(reg, ZR36057_VDTR);
					if (zr->video_interlace)
						reg += zr->gbpl;
					btwrite(reg, ZR36057_VDBR);

					/* video stride, status, and frame grab register */

#ifdef XAWTV_HACK
					reg = (zr->gwidth > 720) ? ((zr->gwidth & ~3) - 720) * zr->gbpl / zr->gwidth : 0;
#else
					reg = 0;
#endif
					if (zr->video_interlace)
						reg += zr->gbpl;
					reg = (reg << ZR36057_VSSFGR_DispStride);
					reg |= ZR36057_VSSFGR_VidOvf;
					reg |= ZR36057_VSSFGR_SnapShot;
					reg |= ZR36057_VSSFGR_FrameGrab;
					btwrite(reg, ZR36057_VSSFGR);

					btor(ZR36057_VDCR_VidEn, ZR36057_VDCR);
				}
			}
		}
#endif				/* (IRQ_MASK & ZR36057_ISR_GIRQ0) */

#if (IRQ_MASK & ZR36057_ISR_GIRQ1)
		if (astat & ZR36057_ISR_GIRQ1) {
			unsigned csr = zr36060_read_8(zr, 0x001);
			unsigned isr = zr36060_read_8(zr, 0x008);

			IDEBUG(printk(KERN_DEBUG "%s: ZR36057_ISR_GIRQ1 60_code=%02x 60_intr=%02x\n",
				      zr->name, csr, isr));

			btand(~ZR36057_ICR_GIRQ1, ZR36057_ICR);
			zoran_reap_stat_com(zr);
			zoran_feed_stat_com(zr);
		}
#endif				/* (IRQ_MASK & ZR36057_ISR_GIRQ1) */

#if (IRQ_MASK & ZR36057_ISR_CodRepIRQ)
		if (astat & ZR36057_ISR_CodRepIRQ) {
			IDEBUG(printk(KERN_DEBUG "%s: ZR36057_ISR_CodRepIRQ\n", zr->name));
			btand(~ZR36057_ICR_CodRepIRQ, ZR36057_ICR);
		}
#endif				/* (IRQ_MASK & ZR36057_ISR_CodRepIRQ) */

#if (IRQ_MASK & ZR36057_ISR_JPEGRepIRQ)
		if ((astat & ZR36057_ISR_JPEGRepIRQ) &&
		    (zr->codec_mode == BUZ_MODE_MOTION_DECOMPRESS ||
		     zr->codec_mode == BUZ_MODE_MOTION_COMPRESS)) {
			zoran_reap_stat_com(zr);
			zoran_feed_stat_com(zr);
			wake_up_interruptible(&zr->jpg_capq);
		}
#endif				/* (IRQ_MASK & ZR36057_ISR_JPEGRepIRQ) */

		count++;
		if (count > 10) {
			printk(KERN_WARNING "%s: irq loop %d\n", zr->name, count);
			if (count > 20) {
				btwrite(0, ZR36057_ICR);
				printk(KERN_ERR  "%s: IRQ lockup, cleared int mask\n", zr->name);
				break;
			}
		}
	}
	spin_unlock_irqrestore(&zr->lock, flags);
}

/* Check a zoran_params struct for correctness, insert default params */

static int zoran_check_params(struct zoran *zr, struct zoran_params *params)
{
	int err = 0, err0 = 0;

	/* insert constant params */

	params->major_version = MAJOR_VERSION;
	params->minor_version = MINOR_VERSION;

	/* Check input and norm */

	if (params->input != 0 && params->input != 1) {
		err++;
	}
	if (params->norm != VIDEO_MODE_PAL && params->norm != VIDEO_MODE_NTSC) {
		err++;
	}
	/* Check decimation, set default values for decimation = 1, 2, 4 */

	switch (params->decimation) {
	case 1:

		params->HorDcm = 1;
		params->VerDcm = 1;
		params->TmpDcm = 1;
		params->field_per_buff = 2;

		params->img_x = 0;
		params->img_y = 0;
		params->img_width = 720;
		params->img_height = tvnorms[params->norm].Ha / 2;
		break;

	case 2:

		params->HorDcm = 2;
		params->VerDcm = 1;
		params->TmpDcm = 2;
		params->field_per_buff = 1;

		params->img_x = 8;
		params->img_y = 0;
		params->img_width = 704;
		params->img_height = tvnorms[params->norm].Ha / 2;
		break;

	case 4:

		params->HorDcm = 4;
		params->VerDcm = 2;
		params->TmpDcm = 2;
		params->field_per_buff = 1;

		params->img_x = 8;
		params->img_y = 0;
		params->img_width = 704;
		params->img_height = tvnorms[params->norm].Ha / 2;
		break;

	case 0:

		/* We have to check the data the user has set */

		if (params->HorDcm != 1 && params->HorDcm != 2 && params->HorDcm != 4)
			err0++;
		if (params->VerDcm != 1 && params->VerDcm != 2)
			err0++;
		if (params->TmpDcm != 1 && params->TmpDcm != 2)
			err0++;
		if (params->field_per_buff != 1 && params->field_per_buff != 2)
			err0++;

		if (params->img_x < 0)
			err0++;
		if (params->img_y < 0)
			err0++;
		if (params->img_width < 0)
			err0++;
		if (params->img_height < 0)
			err0++;
		if (params->img_x + params->img_width > 720)
			err0++;
		if (params->img_y + params->img_height > tvnorms[params->norm].Ha / 2)
			err0++;
		if (params->img_width % (16 * params->HorDcm) != 0)
			err0++;
		if (params->img_height % (8 * params->VerDcm) != 0)
			err0++;

		if (err0) {
			err++;
		}
		break;

	default:
		err++;
		break;
	}

	if (params->quality > 100)
		params->quality = 100;
	if (params->quality < 5)
		params->quality = 5;

	if (params->APPn < 0)
		params->APPn = 0;
	if (params->APPn > 15)
		params->APPn = 15;
	if (params->APP_len < 0)
		params->APP_len = 0;
	if (params->APP_len > 60)
		params->APP_len = 60;
	if (params->COM_len < 0)
		params->COM_len = 0;
	if (params->COM_len > 60)
		params->COM_len = 60;

	if (err)
		return -EINVAL;

	return 0;

}
static void zoran_open_init_params(struct zoran *zr)
{
	int i;

	/* Per default, map the V4L Buffers */

	zr->map_mjpeg_buffers = 0;

	/* User must explicitly set a window */

	zr->window_set = 0;

	zr->window.x = 0;
	zr->window.y = 0;
	zr->window.width = 0;
	zr->window.height = 0;
	zr->window.chromakey = 0;
	zr->window.flags = 0;
	zr->window.clips = NULL;
	zr->window.clipcount = 0;

	zr->video_interlace = 0;

	zr->v4l_memgrab_active = 0;
	zr->v4l_overlay_active = 0;

	zr->v4l_grab_frame = NO_GRAB_ACTIVE;
	zr->v4l_grab_seq = 0;

	zr->gwidth = 0;
	zr->gheight = 0;
	zr->gformat = 0;
	zr->gbpl = 0;

	/* DMA ring stuff for V4L */

	zr->v4l_pend_tail = 0;
	zr->v4l_pend_head = 0;
	for (i = 0; i < v4l_nbufs; i++) {
		zr->v4l_gbuf[i].state = BUZ_STATE_USER;	/* nothing going on */
	}

	/* Set necessary params and call zoran_check_params to set the defaults */

	zr->params.decimation = 1;

	zr->params.quality = 50;	/* default compression factor 8 */
	zr->params.odd_even = 1;

	zr->params.APPn = 0;
	zr->params.APP_len = 0;	/* No APPn marker */
	for (i = 0; i < 60; i++)
		zr->params.APP_data[i] = 0;

	zr->params.COM_len = 0;	/* No COM marker */
	for (i = 0; i < 60; i++)
		zr->params.COM_data[i] = 0;

	zr->params.VFIFO_FB = 0;

	memset(zr->params.reserved, 0, sizeof(zr->params.reserved));

	zr->params.jpeg_markers = JPEG_MARKER_DHT | JPEG_MARKER_DQT;

	i = zoran_check_params(zr, &zr->params);
	if (i)
		printk(KERN_ERR "%s: zoran_open_init_params internal error\n", zr->name);
}

/*
 *   Open a buz card. Right now the flags stuff is just playing
 */

static int zoran_open(struct video_device *dev, int flags)
{
	struct zoran *zr = (struct zoran *) dev;

	DEBUG(printk(KERN_INFO ": zoran_open\n"));

	switch (flags) {

	case 0:
		if (zr->user)
			return -EBUSY;
		zr->user++;

		if (v4l_fbuffer_alloc(zr) < 0) {
			zr->user--;
			return -ENOMEM;
		}
		/* default setup */

		zoran_open_init_params(zr);

		zr36057_enable_jpg(zr, BUZ_MODE_IDLE);

		btwrite(IRQ_MASK, ZR36057_ISR);		// Clears interrupts

		btor(ZR36057_ICR_IntPinEn, ZR36057_ICR);

		break;

	default:
		return -EBUSY;

	}
	return 0;
}

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

	DEBUG(printk(KERN_INFO ": zoran_close\n"));
	
	/* disable interrupts */
	btand(~ZR36057_ICR_IntPinEn, ZR36057_ICR);

	/* wake up sleeping beauties */
	wake_up_interruptible(&zr->v4l_capq);
	wake_up_interruptible(&zr->jpg_capq);

	zr36057_enable_jpg(zr, BUZ_MODE_IDLE);
	zr36057_set_memgrab(zr, 0);
	if (zr->v4l_overlay_active)
		zr36057_overlay(zr, 0);

	zr->user--;

	v4l_fbuffer_free(zr);
	jpg_fbuffer_free(zr);
	zr->jpg_nbufs = 0;

	DEBUG(printk(KERN_INFO ": zoran_close done\n"));
}


static long zoran_read(struct video_device *dev, char *buf, unsigned long count, int nonblock)
{
	return -EINVAL;
}

static long zoran_write(struct video_device *dev, const char *buf, unsigned long count, int nonblock)
{
	return -EINVAL;
}

/*
 *   ioctl routine
 */


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

	switch (cmd) {

	case VIDIOCGCAP:
		{
			struct video_capability b;
			IOCTL_DEBUG(printk("buz ioctl VIDIOCGCAP\n"));
			strncpy(b.name, zr->video_dev.name, sizeof(b.name));
			b.type = VID_TYPE_CAPTURE |
			    VID_TYPE_OVERLAY |
			    VID_TYPE_CLIPPING |
			    VID_TYPE_FRAMERAM |
			    VID_TYPE_SCALES;
			/* theoretically we could also flag VID_TYPE_SUBCAPTURE
			   but this is not even implemented in the BTTV driver */

			b.channels = 2;		/* composite, svhs */
			b.audios = 0;
			b.maxwidth = BUZ_MAX_WIDTH;
			b.maxheight = BUZ_MAX_HEIGHT;
			b.minwidth = BUZ_MIN_WIDTH;
			b.minheight = BUZ_MIN_HEIGHT;
			if (copy_to_user(arg, &b, sizeof(b))) {
				return -EFAULT;
			}
			return 0;
		}

	case VIDIOCGCHAN:
		{
			struct video_channel v;

			if (copy_from_user(&v, arg, sizeof(v))) {
				return -EFAULT;
			}
			IOCTL_DEBUG(printk("buz ioctl VIDIOCGCHAN for channel %d\n", v.channel));
			switch (v.channel) {
			case 0:
				strcpy(v.name, "Composite");
				break;
			case 1:
				strcpy(v.name, "SVHS");
				break;
			default:
				return -EINVAL;
			}
			v.tuners = 0;
			v.flags = 0;
			v.type = VIDEO_TYPE_CAMERA;
			v.norm = zr->params.norm;
			if (copy_to_user(arg, &v, sizeof(v))) {
				return -EFAULT;
			}
			return 0;
		}

		/* RJ: the documentation at http://roadrunner.swansea.linux.org.uk/v4lapi.shtml says:

		 * "The VIDIOCSCHAN ioctl takes an integer argument and switches the capture to this input."
		 *                                 ^^^^^^^
		 * The famos BTTV driver has it implemented with a struct video_channel argument
		 * and we follow it for compatibility reasons
		 *
		 * BTW: this is the only way the user can set the norm!
		 */

	case VIDIOCSCHAN:
		{
			struct video_channel v;
			int input;
			int on, res;

			if (copy_from_user(&v, arg, sizeof(v))) {
				return -EFAULT;
			}
			IOCTL_DEBUG(printk("buz ioctl VIDIOCSCHAN: channel=%d, norm=%d\n", v.channel, v.norm));
			switch (v.channel) {
			case 0:
				input = 3;
				break;
			case 1:
				input = 7;
				break;
			default:
				return -EINVAL;
			}

			if (v.norm != VIDEO_MODE_PAL
			    && v.norm != VIDEO_MODE_NTSC) {
				return -EINVAL;
			}
			zr->params.norm = v.norm;
			zr->params.input = v.channel;

			/* We switch overlay off and on since a change in the norm
			   needs different VFE settings */

			on = zr->v4l_overlay_active && !zr->v4l_memgrab_active;
			if (on)
				zr36057_overlay(zr, 0);

			i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_INPUT, &input);
			i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_NORM, &zr->params.norm);
			i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEOENCODER, ENCODER_SET_NORM, &zr->params.norm);

			if (on)
				zr36057_overlay(zr, 1);

			/* Make sure the changes come into effect */
			res = wait_grab_pending(zr);
			if (res)
				return res;

			return 0;
		}

	case VIDIOCGTUNER:
	case VIDIOCSTUNER:
			return -EINVAL;

	case VIDIOCGPICT:
		{
			struct video_picture p = zr->picture;

			IOCTL_DEBUG(printk("buz ioctl VIDIOCGPICT\n"));
			p.depth = zr->buffer.depth;
			switch (zr->buffer.depth) {
			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;
			}
			return 0;
		}

	case VIDIOCSPICT:
		{
			struct video_picture p;

			if (copy_from_user(&p, arg, sizeof(p))) {
				return -EFAULT;
			}
			i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_PICTURE, &p);
			IOCTL_DEBUG(printk("buz ioctl VIDIOCSPICT bri=%d hue=%d col=%d con=%d dep=%d pal=%d\n",
					   p.brightness, p.hue, p.colour, p.contrast, p.depth, p.palette));
			/* The depth and palette values have no meaning to us,
			   should we return  -EINVAL if they don't fit ? */
			zr->picture = p;
			return 0;
		}

	case VIDIOCCAPTURE:
		{
			int v, res;

			if (copy_from_user(&v, arg, sizeof(v))) {
				return -EFAULT;
			}
			IOCTL_DEBUG(printk("buz ioctl VIDIOCCAPTURE: %d\n", v));
			/* If there is nothing to do, return immediatly */

			if ((v && zr->v4l_overlay_active) || (!v && !zr->v4l_overlay_active))
				return 0;

			if (v == 0) {
				zr->v4l_overlay_active = 0;
				if (!zr->v4l_memgrab_active)
					zr36057_overlay(zr, 0);
				/* When a grab is running, the video simply won't be switched on any more */
			} else {
				if (!zr->buffer_set || !zr->window_set) {
					return -EINVAL;
				}
				zr->v4l_overlay_active = 1;
				if (!zr->v4l_memgrab_active)
					zr36057_overlay(zr, 1);
				/* When a grab is running, the video will be switched on when grab is finished */
			}
			/* Make sure the changes come into effect */
			res = wait_grab_pending(zr);
			if (res)
				return res;
			return 0;
		}

	case VIDIOCGWIN:
		{
			IOCTL_DEBUG(printk("buz ioctl VIDIOCGWIN\n"));
			if (copy_to_user(arg, &zr->window, sizeof(zr->window))) {
				return -EFAULT;
			}
			return 0;
		}

	case VIDIOCSWIN:
		{
			struct video_clip *vcp;
			struct video_window vw;
			int on, end, res;

			if (copy_from_user(&vw, arg, sizeof(vw))) {
				return -EFAULT;
			}
			IOCTL_DEBUG(printk("buz ioctl VIDIOCSWIN: x=%d y=%d w=%d h=%d clipcount=%d\n", vw.x, vw.y, vw.width, vw.height, vw.clipcount));
			if (!zr->buffer_set) {
				return -EINVAL;
			}
			/*
			 * The video front end needs 4-byte alinged line sizes, we correct that
			 * silently here if necessary
			 */

			if (zr->buffer.depth == 15 || zr->buffer.depth == 16) {
				end = (vw.x + vw.width) & ~1;	/* round down */
				vw.x = (vw.x + 1) & ~1;		/* round up */
				vw.width = end - vw.x;
			}
			if (zr->buffer.depth == 24) {
				end = (vw.x + vw.width) & ~3;	/* round down */
				vw.x = (vw.x + 3) & ~3;		/* round up */
				vw.width = end - vw.x;
			}
#if 0
			// At least xawtv seems to care about the following - just leave it away
			/*
			 * Also corrected silently (as long as window fits at all):
			 * video not fitting the screen
			 */
#if 0
			if (vw.x < 0 || vw.y < 0 || vw.x + vw.width > zr->buffer.width ||
			    vw.y + vw.height > zr->buffer.height) {
				printk(BUZ_ERR ": VIDIOCSWIN: window does not fit frame buffer: %dx%d+%d*%d\n",
				       vw.width, vw.height, vw.x, vw.y);
				return -EINVAL;
			}
#else
			if (vw.x < 0)
				vw.x = 0;
			if (vw.y < 0)
				vw.y = 0;
			if (vw.x + vw.width > zr->buffer.width)
				vw.width = zr->buffer.width - vw.x;
			if (vw.y + vw.height > zr->buffer.height)
				vw.height = zr->buffer.height - vw.y;
#endif
#endif

			/* Check for valid parameters */
			if (vw.width < BUZ_MIN_WIDTH || vw.height < BUZ_MIN_HEIGHT ||
			    vw.width > BUZ_MAX_WIDTH || vw.height > BUZ_MAX_HEIGHT) {
				return -EINVAL;
			}
#ifdef XAWTV_HACK
			if (vw.width > 720)
				vw.width = 720;
#endif

			zr->window.x = vw.x;
			zr->window.y = vw.y;
			zr->window.width = vw.width;
			zr->window.height = vw.height;
			zr->window.chromakey = 0;
			zr->window.flags = 0;	// RJ: Is this intended for interlace on/off ?

			zr->window.clips = NULL;
			zr->window.clipcount = vw.clipcount;

			/*
			 * If an overlay is running, we have to switch it off
			 * and switch it on again in order to get the new settings in effect.
			 *
			 * We also want to avoid that the overlay mask is written
			 * when an overlay is running.
			 */

			on = zr->v4l_overlay_active && !zr->v4l_memgrab_active;
			if (on)
				zr36057_overlay(zr, 0);

			/*
			 *   Write the overlay mask if clips are wanted.
			 */
			if (vw.clipcount) {
				vcp = vmalloc(sizeof(struct video_clip) * (vw.clipcount + 4));
				if (vcp == NULL) {
					return -ENOMEM;
				}
				if (copy_from_user(vcp, vw.clips, sizeof(struct video_clip) * vw.clipcount)) {
					vfree(vcp);
					return -EFAULT;
				}
				write_overlay_mask(zr, vcp, vw.clipcount);
				vfree(vcp);
			}
			if (on)
				zr36057_overlay(zr, 1);
			zr->window_set = 1;

			/* Make sure the changes come into effect */
			res = wait_grab_pending(zr);
			if (res)
				return res;

			return 0;
		}

	case VIDIOCGFBUF:
		{
			IOCTL_DEBUG(printk("buz ioctl VIDIOCGFBUF\n"));
			if (copy_to_user(arg, &zr->buffer, sizeof(zr->buffer))) {
				return -EFAULT;
			}
			return 0;
		}

	case VIDIOCSFBUF:
		{
			struct video_buffer v;

			if (!capable(CAP_SYS_ADMIN)
			|| !capable(CAP_SYS_RAWIO))
				return -EPERM;

			if (copy_from_user(&v, arg, sizeof(v)))
				return -EFAULT;
			
			IOCTL_DEBUG(printk("buz ioctl VIDIOCSFBUF: base=0x%x w=%d h=%d depth=%d bpl=%d\n", (u32) v.base, v.width, v.height, v.depth, v.bytesperline));
			if (zr->v4l_overlay_active) {
				/* Has the user gotten crazy ... ? */
				return -EINVAL;
			}
			if (v.depth != 15
			    && v.depth != 16
			    && v.depth != 24
			    && v.depth != 32) {
				return -EINVAL;
			}
			if (v.height <= 0 || v.width <= 0 || v.bytesperline <= 0) {
				return -EINVAL;
			}
			if (v.bytesperline & 3) {
				return -EINVAL;
			}
			if (v.base) {
				zr->buffer.base = (void *) ((unsigned long) v.base & ~3);
			}
			zr->buffer.height = v.height;
			zr->buffer.width = v.width;
			zr->buffer.depth = v.depth;
			zr->buffer.bytesperline = v.bytesperline;

			if (zr->buffer.base)
				zr->buffer_set = 1;
			zr->window_set = 0;	/* The user should set new window parameters */
			return 0;
		}

		/* RJ: what is VIDIOCKEY intended to do ??? */

	case VIDIOCGFREQ:
	case VIDIOCSFREQ:
	case VIDIOCGAUDIO:
	case VIDIOCSAUDIO:
		return -EINVAL;
		
	case VIDIOCSYNC:
		{
			int v;

			if (copy_from_user(&v, arg, sizeof(v))) {
				return -EFAULT;
			}
			IOCTL_DEBUG(printk("buz ioctl VIDIOCSYNC %d\n", v));
			return v4l_sync(zr, v);
		}

	case VIDIOCMCAPTURE:
		{
			struct video_mmap vm;

			if (copy_from_user((void *) &vm, (void *) arg, sizeof(vm))) {
				return -EFAULT;
			}
			IOCTL_DEBUG(printk("buz ioctl VIDIOCMCAPTURE frame=%d geom=%dx%d fmt=%d\n",
			       vm.frame, vm.height, vm.width, vm.format));
			return v4l_grab(zr, &vm);
		}

	case VIDIOCGMBUF:
		{
			struct video_mbuf vm;
			int i;

			IOCTL_DEBUG(printk("buz ioctl VIDIOCGMBUF\n"));
		
			vm.size = v4l_nbufs * v4l_bufsize;
			vm.frames = v4l_nbufs;
			for (i = 0; i < v4l_nbufs; i++) {
				vm.offsets[i] = i * v4l_bufsize;
			}

			/* The next mmap will map the V4L buffers */
			zr->map_mjpeg_buffers = 0;

			if (copy_to_user(arg, &vm, sizeof(vm))) {
				return -EFAULT;
			}
			return 0;
		}

	case VIDIOCGUNIT:
		{
			struct video_unit vu;

			IOCTL_DEBUG(printk("buz ioctl VIDIOCGUNIT\n"));
			vu.video = zr->video_dev.minor;
			vu.vbi = VIDEO_NO_UNIT;
			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;
			return 0;
		}

		/*
		 * RJ: In principal we could support subcaptures for V4L grabbing.
		 *     Not even the famous BTTV driver has them, however.
		 *     If there should be a strong demand, one could consider
		 *     to implement them.
		 */
	case VIDIOCGCAPTURE:
	case VIDIOCSCAPTURE:
			return -EINVAL;

	case BUZIOC_G_PARAMS:
		{
			IOCTL_DEBUG(printk("buz ioctl BUZIOC_G_PARAMS\n"));
			if (copy_to_user(arg, &(zr->params), sizeof(zr->params))) 
				return -EFAULT;
			return 0;
		}

	case BUZIOC_S_PARAMS:
		{
			struct zoran_params bp;
			int input, on;

			if (zr->codec_mode != BUZ_MODE_IDLE) {
				return -EINVAL;
			}
			if (copy_from_user(&bp, arg, sizeof(bp))) {
				return -EFAULT;
			}
			IOCTL_DEBUG(printk("buz ioctl BUZIOC_S_PARAMS\n"));
			
			/* Check the params first before overwriting our internal values */

			if (zoran_check_params(zr, &bp))
				return -EINVAL;

			zr->params = bp;

			/* Make changes of input and norm go into effect immediatly */

			/* We switch overlay off and on since a change in the norm
			   needs different VFE settings */

			on = zr->v4l_overlay_active && !zr->v4l_memgrab_active;
			if (on)
				zr36057_overlay(zr, 0);

			input = zr->params.input == 0 ? 3 : 7;
			i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_INPUT, &input);
			i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_NORM, &zr->params.norm);
			i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEOENCODER, ENCODER_SET_NORM, &zr->params.norm);

			if (on)
				zr36057_overlay(zr, 1);

			if (copy_to_user(arg, &bp, sizeof(bp))) {
				return -EFAULT;
			}
			return 0;
		}

	case BUZIOC_REQBUFS:
		{
			struct zoran_requestbuffers br;

			if (zr->jpg_buffers_allocated) {
				return -EINVAL;
			}
			if (copy_from_user(&br, arg, sizeof(br))) {
				return -EFAULT;
			}
			IOCTL_DEBUG(printk("buz ioctl BUZIOC_REQBUFS count = %lu size=%lu\n",
					   br.count, br.size));
			/* Enforce reasonable lower and upper limits */
			if (br.count < 4)
				br.count = 4;	/* Could be choosen smaller */
			if (br.count > BUZ_MAX_FRAME)
				br.count = BUZ_MAX_FRAME;
			br.size = PAGE_ALIGN(br.size);
			if (br.size < 8192)
				br.size = 8192;		/* Arbitrary */
			/* br.size is limited by 1 page for the stat_com tables to a Maximum of 2 MB */
			if (br.size > (512 * 1024))
				br.size = (512 * 1024);		/* 512 K should be enough */
			if (zr->need_contiguous && br.size > KMALLOC_MAXSIZE)
				br.size = KMALLOC_MAXSIZE;

			zr->jpg_nbufs = br.count;
			zr->jpg_bufsize = br.size;

			if (jpg_fbuffer_alloc(zr))
				return -ENOMEM;

			/* The next mmap will map the MJPEG buffers */
			zr->map_mjpeg_buffers = 1;

			if (copy_to_user(arg, &br, sizeof(br))) {
				return -EFAULT;
			}
			return 0;
		}

	case BUZIOC_QBUF_CAPT:
		{
			int nb;

			if (copy_from_user((void *) &nb, (void *) arg, sizeof(int))) {
				return -EFAULT;
			}
			IOCTL_DEBUG(printk("buz ioctl BUZIOC_QBUF_CAPT %d\n", nb));
			return jpg_qbuf(zr, nb, BUZ_MODE_MOTION_COMPRESS);
		}

	case BUZIOC_QBUF_PLAY:
		{
			int nb;

			if (copy_from_user((void *) &nb, (void *) arg, sizeof(int))) {
				return -EFAULT;
			}
			IOCTL_DEBUG(printk("buz ioctl BUZIOC_QBUF_PLAY %d\n", nb));
			return jpg_qbuf(zr, nb, BUZ_MODE_MOTION_DECOMPRESS);
		}

	case BUZIOC_SYNC:
		{
			struct zoran_sync bs;
			int res;

			IOCTL_DEBUG(printk("buz ioctl BUZIOC_SYNC\n"));
			res = jpg_sync(zr, &bs);
			if (copy_to_user(arg, &bs, sizeof(bs))) {
				return -EFAULT;
			}
			return res;
		}

	case BUZIOC_G_STATUS:
		{
			struct zoran_status bs;
			int norm, input, status;

			if (zr->codec_mode != BUZ_MODE_IDLE) {
				return -EINVAL;
			}
			if (copy_from_user(&bs, arg, sizeof(bs))) {
				return -EFAULT;
			}
			IOCTL_DEBUG(printk("buz ioctl BUZIOC_G_STATUS\n"));
			switch (bs.input) {
			case 0:
				input = 3;
				break;
			case 1:
				input = 7;
				break;
			default:
				return -EINVAL;
			}

			/* Set video norm to VIDEO_MODE_AUTO */

			norm = VIDEO_MODE_AUTO;
			i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_INPUT, &input);
			i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_NORM, &norm);

			/* sleep 1 second */

			schedule_timeout(HZ);
			
			/* Get status of video decoder */

			i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_GET_STATUS, &status);
			bs.signal = (status & DECODER_STATUS_GOOD) ? 1 : 0;
			bs.norm = (status & DECODER_STATUS_NTSC) ? VIDEO_MODE_NTSC : VIDEO_MODE_PAL;
			bs.color = (status & DECODER_STATUS_COLOR) ? 1 : 0;

			/* restore previous input and norm */
			input = zr->params.input == 0 ? 3 : 7;
			i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_INPUT, &input);
			i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_NORM, &zr->params.norm);

			if (copy_to_user(arg, &bs, sizeof(bs))) {
				return -EFAULT;
			}
			return 0;
		}

	default:
		    return -ENOIOCTLCMD;

	}
	return 0;
}


/*
 *   This maps the buffers to user space.
 *
 *   Depending on the state of zr->map_mjpeg_buffers
 *   the V4L or the MJPEG buffers are mapped
 *
 */

static int zoran_mmap(struct video_device *dev, const char *adr, unsigned long size)
{
	struct zoran *zr = (struct zoran *) dev;
	unsigned long start = (unsigned long) adr;
	unsigned long page, pos, todo, fraglen;
	int i, j;

	if (zr->map_mjpeg_buffers) {
		/* Map the MJPEG buffers */

		if (!zr->jpg_buffers_allocated) {
			return -ENOMEM;
		}
		if (size > zr->jpg_nbufs * zr->jpg_bufsize) {
			return -EINVAL;
		}

		for (i = 0; i < zr->jpg_nbufs; i++) {
			for (j = 0; j < zr->jpg_bufsize / PAGE_SIZE; j++) {
				fraglen = (zr->jpg_gbuf[i].frag_tab[2 * j + 1] & ~1) << 1;
				todo = size;
				if (todo > fraglen)
					todo = fraglen;
				pos = (unsigned long) zr->jpg_gbuf[i].frag_tab[2 * j];
				page = virt_to_phys(bus_to_virt(pos));	/* should just be pos on i386 */
				if (remap_page_range(start, page, todo, PAGE_SHARED)) {
					printk(KERN_ERR "%s: zoran_mmap(V4L): remap_page_range failed\n", zr->name);
					return -EAGAIN;
				}
				size -= todo;
				start += todo;
				if (size == 0)
					break;
				if (zr->jpg_gbuf[i].frag_tab[2 * j + 1] & 1)
					break;	/* was last fragment */
			}
			if (size == 0)
				break;
		}
	} else {
		/* Map the V4L buffers */

		if (size > v4l_nbufs * v4l_bufsize) {
			return -EINVAL;
		}

		for (i = 0; i < v4l_nbufs; i++) {
			todo = size;
			if (todo > v4l_bufsize)
				todo = v4l_bufsize;
			page = zr->v4l_gbuf[i].fbuffer_phys;
			DEBUG(printk("V4L remap page range %d 0x%x %d to 0x%x\n", i, page, todo, start));
			if (remap_page_range(start, page, todo, PAGE_SHARED)) {
				printk(KERN_ERR "%s: zoran_mmap(V4L): remap_page_range failed\n", zr->name);
				return -EAGAIN;
			}
			size -= todo;
			start += todo;
			if (size == 0)
				break;
		}
	}
	return 0;
}

static struct video_device zoran_template =
{
	owner:		THIS_MODULE,
	name:		BUZ_NAME,
	type:		VID_TYPE_CAPTURE | VID_TYPE_OVERLAY | VID_TYPE_CLIPPING | VID_TYPE_FRAMERAM |
			VID_TYPE_SCALES | VID_TYPE_SUBCAPTURE,
	hardware:	VID_HARDWARE_ZR36067,
	open:		zoran_open,
	close:		zoran_close,
	read:		zoran_read,
	write:		zoran_write,
	ioctl:		zoran_ioctl,
	mmap:		zoran_mmap,
};

static int zr36057_init(int i)
{
	struct zoran *zr = &zoran[i];
	unsigned long mem;
	unsigned mem_needed;
	int j;
	int rev;

	/* reset zr36057 */
	btwrite(0, ZR36057_SPGPPCR);
	mdelay(10);

	/* default setup of all parameters which will persist beetween opens */

	zr->user = 0;
	
	init_waitqueue_head(&zr->v4l_capq);
	init_waitqueue_head(&zr->jpg_capq);

	zr->map_mjpeg_buffers = 0;	/* Map V4L buffers by default */

	zr->jpg_nbufs = 0;
	zr->jpg_bufsize = 0;
	zr->jpg_buffers_allocated = 0;

	zr->buffer_set = 0;	/* Flag if frame buffer has been set */
	zr->buffer.base = (void *) vidmem;
	zr->buffer.width = 0;
	zr->buffer.height = 0;
	zr->buffer.depth = 0;
	zr->buffer.bytesperline = 0;

	zr->params.norm = default_norm ? 1 : 0;	/* Avoid nonsense settings from user */
	zr->params.input = default_input ? 1 : 0;	/* Avoid nonsense settings from user */
	zr->video_interlace = 0;

	/* Should the following be reset at every open ? */

	zr->picture.colour = 32768;
	zr->picture.brightness = 32768;
	zr->picture.hue = 32768;
	zr->picture.contrast = 32768;
	zr->picture.whiteness = 0;
	zr->picture.depth = 0;
	zr->picture.palette = 0;

	for (j = 0; j < VIDEO_MAX_FRAME; j++) {
		zr->v4l_gbuf[i].fbuffer = 0;
		zr->v4l_gbuf[i].fbuffer_phys = 0;
		zr->v4l_gbuf[i].fbuffer_bus = 0;
	}

	zr->stat_com = 0;

	/* default setup (will be repeated at every open) */

	zoran_open_init_params(zr);

	/* allocate memory *before* doing anything to the hardware in case allocation fails */

	/* STAT_COM table and overlay mask */

	mem_needed = (BUZ_NUM_STAT_COM + ((BUZ_MAX_WIDTH + 31) / 32) * BUZ_MAX_HEIGHT) * 4;
	mem = (unsigned long) kmalloc(mem_needed, GFP_KERNEL);
	if (!mem) {
		return -ENOMEM;
	}
	memset((void *) mem, 0, mem_needed);

	zr->stat_com = (u32 *) mem;
	for (j = 0; j < BUZ_NUM_STAT_COM; j++) {
		zr->stat_com[j] = 1;	/* mark as unavailable to zr36057 */
	}
	zr->overlay_mask = (u32 *) (mem + BUZ_NUM_STAT_COM * 4);

	/* Initialize zr->jpg_gbuf */

	for (j = 0; j < BUZ_MAX_FRAME; j++) {
		zr->jpg_gbuf[j].frag_tab = 0;
		zr->jpg_gbuf[j].frag_tab_bus = 0;
		zr->jpg_gbuf[j].state = BUZ_STATE_USER;
		zr->jpg_gbuf[j].bs.frame = j;
	}

	/* take zr36057 out of reset now */
	btwrite(ZR36057_SPGPPCR_SoftReset, ZR36057_SPGPPCR);
	mdelay(10);

	/* stop all DMA processes */
	btwrite(ZR36057_MCTCR_CFlush, ZR36057_MCTCR);
	btand(~ZR36057_VDCR_VidEn, ZR36057_VDCR);
	/* assert P_Reset */
	btwrite(0, ZR36057_JPC);

	switch(zr->board)
	{
		case BOARD_BUZ:
	
			/* set up GPIO direction */
			btwrite(ZR36057_SPGPPCR_SoftReset | 0, ZR36057_SPGPPCR);

			/* Set up guest bus timing - Guests 0..3 Tdur=12, Trec=3 */
			btwrite((GPIO_MASK << 24) | 0x8888, ZR36057_GPPGCR1);
			mdelay(10);

			/* reset video decoder */

			GPIO(zr, 0, 0);
			mdelay(10);
			GPIO(zr, 0, 1);
			mdelay(10);

			/* reset JPEG codec */
			zr36060_sleep(zr, 0);
			mdelay(10);
			zr36060_reset(zr);
			mdelay(10);
	
			/* display codec revision */
			if ((rev=zr36060_read_8(zr, 0x022)) == 0x33) {
				printk(KERN_INFO "%s: Zoran ZR36060 (rev %d)\n",
			       zr->name, zr36060_read_8(zr, 0x023));
			} else {
				printk(KERN_ERR "%s: Zoran ZR36060 not found (Rev=%d)\n", zr->name, rev);
				kfree((void *) zr->stat_com);
				return -1;
			}
			break;
			
		case BOARD_LML33:
//			btwrite(btread(ZR36057_SPGPPCR)&~ZR36057_SPGPPCR_SoftReset , ZR36057_SPGPPCR);
//			udelay(100);
//			btwrite(btread(ZR36057_SPGPPCR)|ZR36057_SPGPPCR_SoftReset , ZR36057_SPGPPCR);
//			udelay(1000);

			/*
			 *	Set up the GPIO direction
			 */
			btwrite(btread(ZR36057_SPGPPCR_SoftReset)|0 , ZR36057_SPGPPCR);
			/* Set up guest bus timing - Guests 0..2 Tdur=12, Trec=3 */
			btwrite(0xFF00F888, ZR36057_GPPGCR1);
			mdelay(10);
			GPIO(zr, 5, 0);		/* Analog video bypass */
			udelay(3000);
			GPIO(zr, 0, 0); 	/* Reset 819 */
			udelay(3000);
			GPIO(zr, 0, 1);		/* 819 back */
			udelay(3000);
			/* reset JPEG codec */
			zr36060_sleep(zr, 0);
			udelay(3000);
			zr36060_reset(zr);
			udelay(3000);

			/* display codec revision */
			if ((rev=zr36060_read_8(zr, 0x022)) == 0x33) {
				printk(KERN_INFO "%s: Zoran ZR36060 (rev %d)\n",
			       zr->name, zr36060_read_8(zr, 0x023));
			} else {
				printk(KERN_ERR "%s: Zoran ZR36060 not found (rev=%d)\n", zr->name, rev);
				kfree((void *) zr->stat_com);
				return -1;
			}
			break;
	}
	/* i2c */
	memcpy(&zr->i2c, &zoran_i2c_bus_template, sizeof(struct i2c_bus));
	sprintf(zr->i2c.name, "zoran%u", zr->id);
	zr->i2c.data = zr;
	if (i2c_register_bus(&zr->i2c) < 0) {
		kfree((void *) zr->stat_com);
		return -1;
	}
	/*
	 *   Now add the template and register the device unit.
	 */
	memcpy(&zr->video_dev, &zoran_template, sizeof(zoran_template));
	sprintf(zr->video_dev.name, "zoran%u", zr->id);
	if (video_register_device(&zr->video_dev, VFL_TYPE_GRABBER) < 0) {
		i2c_unregister_bus(&zr->i2c);
		kfree((void *) zr->stat_com);
		return -1;
	}
	/* toggle JPEG codec sleep to sync PLL */
	zr36060_sleep(zr, 1);
	mdelay(10);
	zr36060_sleep(zr, 0);
	mdelay(10);

	/* Enable bus-mastering */
	pci_set_master(zr->pci_dev);

	j = zr->params.input == 0 ? 3 : 7;
	i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_INPUT, &j);
	i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEODECODER, DECODER_SET_NORM, &zr->params.norm);
	i2c_control_device(&zr->i2c, I2C_DRIVERID_VIDEOENCODER, ENCODER_SET_NORM, &zr->params.norm);

	/* set individual interrupt enables (without GIRQ0)
	   but don't global enable until zoran_open() */

	btwrite(IRQ_MASK & ~ZR36057_ISR_GIRQ0, ZR36057_ICR);

	if(request_irq(zr->pci_dev->irq, zoran_irq,
	       SA_SHIRQ | SA_INTERRUPT, zr->name, (void *) zr)<0)
	{
		printk(KERN_ERR "%s: Can't assign irq.\n", zr->name);
		video_unregister_device(&zr->video_dev);
		i2c_unregister_bus(&zr->i2c);
		kfree((void *) zr->stat_com);
		return -1;
	}
	zr->initialized = 1;
	return 0;
}



static void release_zoran(void)
{
	u8 command;
	int i;
	struct zoran *zr;

	for (i = 0; i < zoran_num; i++) {
		zr = &zoran[i];

		if (!zr->initialized)
			continue;

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

		/* disable PCI bus-mastering */
		pci_read_config_byte(zr->pci_dev, PCI_COMMAND, &command);
		command &= ~PCI_COMMAND_MASTER;
		pci_write_config_byte(zr->pci_dev, PCI_COMMAND, command);

		/* put chip into reset */
		btwrite(0, ZR36057_SPGPPCR);

		free_irq(zr->pci_dev->irq, zr);

		/* unmap and free memory */

		kfree((void *) zr->stat_com);

		iounmap(zr->zr36057_mem);

		video_unregister_device(&zr->video_dev);
	}
}

/*
 *   Scan for a Buz card (actually for the PCI controller ZR36057),
 *   request the irq and map the io memory
 */

static int find_zr36057(void)
{
	unsigned char latency;
	struct zoran *zr;
	struct pci_dev *dev = NULL;

	zoran_num = 0;

	while (zoran_num < BUZ_MAX
	       && (dev = pci_find_device(PCI_VENDOR_ID_ZORAN, PCI_DEVICE_ID_ZORAN_36057, dev)) != NULL) {
		zr = &zoran[zoran_num];
		zr->pci_dev = dev;
		zr->zr36057_mem = NULL;
		zr->id = zoran_num;
		sprintf(zr->name, "zoran%u", zr->id);

		spin_lock_init(&zr->lock);

		if (pci_enable_device(dev))
			continue;

		zr->zr36057_adr = pci_resource_start(zr->pci_dev, 0);
		pci_read_config_byte(zr->pci_dev, PCI_CLASS_REVISION, &zr->revision);
		if (zr->revision < 2) {
			printk(KERN_INFO "%s: Zoran ZR36057 (rev %d) irq: %d, memory: 0x%08x.\n",
			       zr->name, zr->revision, zr->pci_dev->irq, zr->zr36057_adr);
		} else {
			unsigned short ss_vendor_id, ss_id;

			ss_vendor_id = zr->pci_dev->subsystem_vendor;
			ss_id = zr->pci_dev->subsystem_device;
			printk(KERN_INFO "%s: Zoran ZR36067 (rev %d) irq: %d, memory: 0x%08x\n",
			       zr->name, zr->revision, zr->pci_dev->irq, zr->zr36057_adr);
			printk(KERN_INFO "%s: subsystem vendor=0x%04x id=0x%04x\n",
			       zr->name, ss_vendor_id, ss_id);
			if(ss_vendor_id==0xFF10 && ss_id == 0xDE41)
			{
				zr->board = BOARD_LML33;
				printk(KERN_INFO "%s: LML33 detected.\n", zr->name);
			}
		}

		zr->zr36057_mem = ioremap(zr->zr36057_adr, 0x1000);
		if (!zr->zr36057_mem) {
			printk(KERN_ERR "%s: ioremap failed\n", zr->name);
			break;
		}

		/* set PCI latency timer */
		pci_read_config_byte(zr->pci_dev, PCI_LATENCY_TIMER, &latency);
		if (latency != 48) {
			printk(KERN_INFO "%s: Changing PCI latency from %d to 48.\n", zr->name, latency);
			latency = 48;
			pci_write_config_byte(zr->pci_dev, PCI_LATENCY_TIMER, latency);
		}
		zoran_num++;
	}
	if (zoran_num == 0)
		printk(KERN_INFO "zoran: no cards found.\n");

	return zoran_num;
}

static void handle_chipset(void)
{
	if(pci_pci_problems&PCIPCI_FAIL)
	{
		printk(KERN_WARNING "buz: This configuration is known to have PCI to PCI DMA problems\n");
		printk(KERN_WARNING "buz: You may not be able to use overlay mode.\n");
	}
			

	if(pci_pci_problems&PCIPCI_TRITON)
	{
		printk("buz: Enabling Triton support.\n");
		triton = 1;
	}
	
	if(pci_pci_problems&PCIPCI_NATOMA)
	{
		printk("buz: Enabling Natoma workaround.\n");
		natoma = 1;
	}
}

#ifdef MODULE
int init_module(void)
#else
int init_zoran_cards(struct video_init *unused)
#endif
{
	int i;


	printk(KERN_INFO "Zoran driver 1.00 (c) 1999 Rainer Johanni, Dave Perks.\n");

	/* Look for Buz cards */

	if (find_zr36057() <= 0) {
		return -EIO;
	}
	printk(KERN_INFO"zoran: %d zoran card(s) found\n", zoran_num);

	if (zoran_num == 0)
		return -ENXIO;

	
	/* check the parameters we have been given, adjust if necessary */

	if (v4l_nbufs < 0)
		v4l_nbufs = 0;
	if (v4l_nbufs > VIDEO_MAX_FRAME)
		v4l_nbufs = VIDEO_MAX_FRAME;
	/* The user specfies the in KB, we want them in byte (and page aligned) */
	v4l_bufsize = PAGE_ALIGN(v4l_bufsize * 1024);
	if (v4l_bufsize < 32768)
		v4l_bufsize = 32768;
	/* 2 MB is arbitrary but sufficient for the maximum possible images */
	if (v4l_bufsize > 2048 * 1024)
		v4l_bufsize = 2048 * 1024;

	printk(KERN_INFO "zoran: using %d V4L buffers of size %d KB\n", v4l_nbufs, v4l_bufsize >> 10);

	/* Use parameter for vidmem or try to find a video card */

	if (vidmem) {
		printk(KERN_INFO "zoran: Using supplied video memory base address @ 0x%lx\n", vidmem);
	}

	/* check if we have a Triton or Natome chipset */

	handle_chipset();

	/* take care of Natoma chipset and a revision 1 zr36057 */

	for (i = 0; i < zoran_num; i++) {
		if (natoma && zoran[i].revision <= 1) {
			zoran[i].need_contiguous = 1;
			printk(KERN_INFO "%s: ZR36057/Natome bug, max. buffer size is 128K\n", zoran[i].name);
		} else {
			zoran[i].need_contiguous = 0;
		}
	}

	/* initialize the Buzs */

	/* We have to know which ones must be released if an error occurs */
	for (i = 0; i < zoran_num; i++)
		zoran[i].initialized = 0;

	for (i = 0; i < zoran_num; i++) {
		if (zr36057_init(i) < 0) {
			release_zoran();
			return -EIO;
		}
	}

	return 0;
}



#ifdef MODULE

void cleanup_module(void)
{
	release_zoran();
}

#endif