/*
 * Zoran zr36057/zr36067 PCI controller driver, for the
 * Pinnacle/Miro DC10/DC10+/DC30/DC30+, Iomega Buz, Linux
 * Media Labs LML33/LML33R10.
 *
 * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
 *
 * Changes for BUZ by Wolfgang Scherr <scherr@net4you.net>
 *
 * Changes for DC10/DC30 by Laurent Pinchart <laurent.pinchart@skynet.be>
 *
 * Changes for LML33R10 by Maxim Yevtyushkin <max@linuxmedialabs.com>
 *
 * Changes for videodev2/v4l2 by Ronald Bultje <rbultje@ronald.bitfreak.net>
 *
 * Based on
 *
 * Miro DC10 driver
 * Copyright (C) 1999 Wolfgang Scherr <scherr@net4you.net>
 *
 * Iomega Buz driver version 1.0
 * Copyright (C) 1999 Rainer Johanni <Rainer@Johanni.de>
 *
 * buz.0.0.3
 * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
 *
 * 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/config.h>
#include <linux/version.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/vmalloc.h>

#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>

#include <linux/spinlock.h>
#define     MAP_NR(x)       virt_to_page(x)
#define     ZORAN_HARDWARE  VID_HARDWARE_ZR36067
#define     ZORAN_VID_TYPE  ( \
				VID_TYPE_CAPTURE | \
				VID_TYPE_OVERLAY | \
				VID_TYPE_CLIPPING | \
				VID_TYPE_FRAMERAM | \
				VID_TYPE_SCALES | \
				VID_TYPE_MJPEG_DECODER | \
				VID_TYPE_MJPEG_ENCODER \
			     )

#include <linux/videodev.h>
#include "videocodec.h"

#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/proc_fs.h>

#include <linux/video_decoder.h>
#include <linux/video_encoder.h>
#include "zoran.h"
#include "zoran_device.h"
#include "zoran_card.h"

#ifdef HAVE_V4L2
	/* we declare some card type definitions here, they mean
	 * the same as the v4l1 ZORAN_VID_TYPE above, except it's v4l2 */
#define ZORAN_V4L2_VID_FLAGS ( \
				V4L2_CAP_STREAMING |\
				V4L2_CAP_VIDEO_CAPTURE |\
				V4L2_CAP_VIDEO_OUTPUT |\
				V4L2_CAP_VIDEO_OVERLAY \
                              )
#endif

#include <asm/byteorder.h>

const struct zoran_format zoran_formats[] = {
	{
		.name = "15-bit RGB",
		.palette = VIDEO_PALETTE_RGB555,
#ifdef HAVE_V4L2
#ifdef __LITTLE_ENDIAN
		.fourcc = V4L2_PIX_FMT_RGB555,
#else
		.fourcc = V4L2_PIX_FMT_RGB555X,
#endif
		.colorspace = V4L2_COLORSPACE_SRGB,
#endif
		.depth = 15,
		.flags = ZORAN_FORMAT_CAPTURE |
			 ZORAN_FORMAT_OVERLAY,
	}, {
		.name = "16-bit RGB",
		.palette = VIDEO_PALETTE_RGB565,
#ifdef HAVE_V4L2
#ifdef __LITTLE_ENDIAN
		.fourcc = V4L2_PIX_FMT_RGB565,
#else
		.fourcc = V4L2_PIX_FMT_RGB565X,
#endif
		.colorspace = V4L2_COLORSPACE_SRGB,
#endif
		.depth = 16,
		.flags = ZORAN_FORMAT_CAPTURE |
			 ZORAN_FORMAT_OVERLAY,
	}, {
		.name = "24-bit RGB",
		.palette = VIDEO_PALETTE_RGB24,
#ifdef HAVE_V4L2
#ifdef __LITTLE_ENDIAN
		.fourcc = V4L2_PIX_FMT_BGR24,
#else
		.fourcc = V4L2_PIX_FMT_RGB24,
#endif
		.colorspace = V4L2_COLORSPACE_SRGB,
#endif
		.depth = 24,
		.flags = ZORAN_FORMAT_CAPTURE |
			 ZORAN_FORMAT_OVERLAY,
	}, {
		.name = "32-bit RGB",
		.palette = VIDEO_PALETTE_RGB32,
#ifdef HAVE_V4L2
#ifdef __LITTLE_ENDIAN
		.fourcc = V4L2_PIX_FMT_BGR32,
#else
		.fourcc = V4L2_PIX_FMT_RGB32,
#endif
		.colorspace = V4L2_COLORSPACE_SRGB,
#endif
		.depth = 32,
		.flags = ZORAN_FORMAT_CAPTURE |
			 ZORAN_FORMAT_OVERLAY,
	}, {
		.name = "4:2:2, packed, YUYV",
		.palette = VIDEO_PALETTE_YUV422,
#ifdef HAVE_V4L2
		.fourcc = V4L2_PIX_FMT_YUYV,
		.colorspace = V4L2_COLORSPACE_SMPTE170M,
#endif
		.depth = 16,
		.flags = ZORAN_FORMAT_CAPTURE |
		         ZORAN_FORMAT_OVERLAY,
	}, {
		.name = "Hardware-encoded Motion-JPEG",
		.palette = -1,
#ifdef HAVE_V4L2
		.fourcc = V4L2_PIX_FMT_MJPEG,
		.colorspace = V4L2_COLORSPACE_SMPTE170M,
#endif
		.depth = 0,
		.flags = ZORAN_FORMAT_CAPTURE |
			 ZORAN_FORMAT_PLAYBACK |
			 ZORAN_FORMAT_COMPRESSED,
	}
};
const int zoran_num_formats =
    (sizeof(zoran_formats) / sizeof(struct zoran_format));

// RJ: Test only - want to test BUZ_USE_HIMEM even when CONFIG_BIGPHYS_AREA is defined
#if !defined(CONFIG_BIGPHYS_AREA)
//#undef CONFIG_BIGPHYS_AREA
#define BUZ_USE_HIMEM
#endif

#if defined(CONFIG_BIGPHYS_AREA)
#   include <linux/bigphysarea.h>
#endif

extern int *zr_debug;

#define dprintk(num, format, args...) \
	do { \
		if (*zr_debug >= num) \
			printk(format, ##args);	\
	} while (0)

extern int v4l_nbufs;
extern int v4l_bufsize;
extern int jpg_nbufs;
extern int jpg_bufsize;
extern int pass_through;

static int lock_norm = 0;	/* 1=Don't change TV standard (norm) */
MODULE_PARM(lock_norm, "i");
MODULE_PARM_DESC(lock_norm, "Users can't change norm");

#ifdef HAVE_V4L2
	/* small helper function for calculating buffersizes for v4l2
	 * we calculate the nearest higher power-of-two, which
	 * will be the recommended buffersize */
static __u32
zoran_v4l2_calc_bufsize (struct zoran_jpg_settings *settings)
{
	__u8 div = settings->VerDcm * settings->HorDcm * settings->TmpDcm;
	__u32 num = (1024 * 512) / (div);
	__u32 result = 2;

	num--;
	while (num) {
		num >>= 1;
		result <<= 1;
	}

	if (result > jpg_bufsize)
		return jpg_bufsize;
	if (result < 8192)
		return 8192;
	return result;
}
#endif

/* forward references */
static void v4l_fbuffer_free(struct file *file);
static void jpg_fbuffer_free(struct file *file);

/*
 *   Allocate the V4L grab buffers
 *
 *   These have to be pysically contiguous.
 *   If v4l_bufsize <= MAX_KMALLOC_MEM we use kmalloc
 *   else we try to allocate them with bigphysarea_alloc_pages
 *   if the bigphysarea patch is present in the kernel,
 *   else we try to use high memory (if the user has bootet
 *   Linux with the necessary memory left over).
 */

#if defined(BUZ_USE_HIMEM) && !defined(CONFIG_BIGPHYS_AREA)
static unsigned long
get_high_mem (unsigned long size)
{
/*
 * Check if there is usable memory at the end of Linux memory
 * of at least size. Return the physical address of this memory,
 * return 0 on failure.
 *
 * The idea is from Alexandro Rubini's book "Linux device drivers".
 * The driver from him which is downloadable from O'Reilly's
 * web site misses the "virt_to_phys(high_memory)" part
 * (and therefore doesn't work at all - at least with 2.2.x kernels).
 *
 * It should be unnecessary to mention that THIS IS DANGEROUS,
 * if more than one driver at a time has the idea to use this memory!!!!
 */

	volatile unsigned char *mem;
	unsigned char c;
	unsigned long hi_mem_ph;
	unsigned long i;

	/* Map the high memory to user space */

	hi_mem_ph = virt_to_phys(high_memory);

	mem = ioremap(hi_mem_ph, size);
	if (!mem) {
		dprintk(1,
			KERN_ERR "%s: get_high_mem() - ioremap failed\n",
			ZORAN_NAME);
		return 0;
	}

	for (i = 0; i < size; i++) {
		/* Check if it is memory */
		c = i & 0xff;
		mem[i] = c;
		if (mem[i] != c)
			break;
		c = 255 - c;
		mem[i] = c;
		if (mem[i] != c)
			break;
		mem[i] = 0;	/* zero out memory */

		/* give the kernel air to breath */
		if ((i & 0x3ffff) == 0x3ffff)
			schedule();
	}

	iounmap((void *) mem);

	if (i != size) {
		dprintk(1,
			KERN_ERR
			"%s: get_high_mem() - requested %lu, avail %lu\n",
			ZORAN_NAME, size, i);
		return 0;
	}

	return hi_mem_ph;
}
#endif

static int
v4l_fbuffer_alloc (struct file *file)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;
	int i, off;
	unsigned char *mem;
#if defined(BUZ_USE_HIMEM) && !defined(CONFIG_BIGPHYS_AREA)
	unsigned long pmem = 0;
#endif

	/* we might have old buffers lying around... */
	if (fh->v4l_buffers.ready_to_be_freed) {
		v4l_fbuffer_free(file);
	}

	for (i = 0; i < fh->v4l_buffers.num_buffers; i++) {
		if (fh->v4l_buffers.buffer[i].fbuffer)
			dprintk(2,
				KERN_WARNING
				"%s: v4l_fbuffer_alloc() - buffer %d allready allocated!?\n",
				ZR_DEVNAME(zr), i);

		//udelay(20);
		if (fh->v4l_buffers.buffer_size <= MAX_KMALLOC_MEM) {
			/* Use kmalloc */

			mem =
			    (unsigned char *) kmalloc(fh->v4l_buffers.
						      buffer_size,
						      GFP_KERNEL);
			if (mem == 0) {
				dprintk(1,
					KERN_ERR
					"%s: v4l_fbuffer_alloc() - kmalloc for V4L buf %d failed\n",
					ZR_DEVNAME(zr), i);
				v4l_fbuffer_free(file);
				return -ENOBUFS;
			}
			fh->v4l_buffers.buffer[i].fbuffer = mem;
			fh->v4l_buffers.buffer[i].fbuffer_phys =
			    virt_to_phys(mem);
			fh->v4l_buffers.buffer[i].fbuffer_bus =
			    virt_to_bus(mem);
			for (off = 0; off < fh->v4l_buffers.buffer_size;
			     off += PAGE_SIZE)
				SetPageReserved(MAP_NR(mem + off));
			dprintk(4,
				KERN_INFO
				"%s: v4l_fbuffer_alloc() - V4L frame %d mem 0x%lx (bus: 0x%lx)\n",
				ZR_DEVNAME(zr), i, (unsigned long) mem,
				virt_to_bus(mem));
		} else {
#if defined(CONFIG_BIGPHYS_AREA)
			/* Use bigphysarea_alloc_pages */

			int n =
			    (fh->v4l_buffers.buffer_size + PAGE_SIZE -
			     1) / PAGE_SIZE;

			mem =
			    (unsigned char *) bigphysarea_alloc_pages(n, 0,
								      GFP_KERNEL);
			if (mem == 0) {
				dprintk(1,
					KERN_ERR
					"%s: v4l_fbuffer_alloc() - bigphysarea_alloc_pages for V4L buf %d failed\n",
					ZR_DEVNAME(zr), i);
				v4l_fbuffer_free(file);
				return -ENOBUFS;
			}
			fh->v4l_buffers.buffer[i].fbuffer = mem;
			fh->v4l_buffers.buffer[i].fbuffer_phys =
			    virt_to_phys(mem);
			fh->v4l_buffers.buffer[i].fbuffer_bus =
			    virt_to_bus(mem);
			dprintk(4,
				KERN_INFO
				"%s: Bigphysarea frame %d mem 0x%x (bus: 0x%x)\n",
				ZR_DEVNAME(zr), i, (unsigned) mem,
				(unsigned) virt_to_bus(mem));

			/* Zero out the allocated memory */
			memset(fh->v4l_buffers.buffer[i].fbuffer, 0,
			       fh->v4l_buffers.buffer_size);
#elif defined(BUZ_USE_HIMEM)

			/* Use high memory which has been left at boot time */

			/* Ok., Ok. this is an evil hack - we make
			 * the assumption that physical addresses are
			 * the same as bus addresses (true at least
			 * for Intel processors). The whole method of
			 * obtaining and using this memory is not very
			 * nice - but I hope it saves some poor users
			 * from kernel hacking, which might have even
			 * more evil results */

			if (i == 0) {
				int size =
				    fh->v4l_buffers.num_buffers *
				    fh->v4l_buffers.buffer_size;

				pmem = get_high_mem(size);
				if (pmem == 0) {
					dprintk(1,
						KERN_ERR
						"%s: v4l_fbuffer_alloc() - get_high_mem (size = %d KB) for V4L bufs failed\n",
						ZR_DEVNAME(zr), size >> 10);
					return -ENOBUFS;
				}
				fh->v4l_buffers.buffer[0].fbuffer = 0;
				fh->v4l_buffers.buffer[0].fbuffer_phys =
				    pmem;
				fh->v4l_buffers.buffer[0].fbuffer_bus =
				    pmem;
				dprintk(4,
					KERN_INFO
					"%s: v4l_fbuffer_alloc() - using %d KB high memory\n",
					ZR_DEVNAME(zr), size >> 10);
			} else {
				fh->v4l_buffers.buffer[i].fbuffer = 0;
				fh->v4l_buffers.buffer[i].fbuffer_phys =
				    pmem + i * fh->v4l_buffers.buffer_size;
				fh->v4l_buffers.buffer[i].fbuffer_bus =
				    pmem + i * fh->v4l_buffers.buffer_size;
			}
#else
			/* No bigphysarea present, usage of high memory disabled,
			 * but user wants buffers of more than MAX_KMALLOC_MEM */
			dprintk(1,
				KERN_ERR
				"%s: v4l_fbuffer_alloc() - no bigphysarea_patch present, usage of high memory disabled,\n",
				ZR_DEVNAME(zr));
			dprintk(1,
				KERN_ERR
				"%s: v4l_fbuffer_alloc() - sorry, could not allocate %d V4L buffers of size %d KB.\n",
				ZR_DEVNAME(zr), fh->v4l_buffers.num_buffers,
				fh->v4l_buffers.buffer_size >> 10);
			return -ENOBUFS;
#endif
		}
	}

	fh->v4l_buffers.allocated = 1;

	return 0;
}

/* free the V4L grab buffers */
static void
v4l_fbuffer_free (struct file *file)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;
	int i, off;
	unsigned char *mem;

	dprintk(4, KERN_INFO "%s: v4l_fbuffer_free()\n", ZR_DEVNAME(zr));

	for (i = 0; i < fh->v4l_buffers.num_buffers; i++) {
		if (!fh->v4l_buffers.buffer[i].fbuffer)
			continue;

		if (fh->v4l_buffers.buffer_size <= MAX_KMALLOC_MEM) {
			mem = fh->v4l_buffers.buffer[i].fbuffer;
			for (off = 0; off < fh->v4l_buffers.buffer_size;
			     off += PAGE_SIZE)
				ClearPageReserved(MAP_NR(mem + off));
			kfree((void *) fh->v4l_buffers.buffer[i].fbuffer);
		}
#if defined(CONFIG_BIGPHYS_AREA)
		else
			bigphysarea_free_pages((void *) fh->v4l_buffers.
					       buffer[i].fbuffer);
#endif
		fh->v4l_buffers.buffer[i].fbuffer = NULL;
	}

	fh->v4l_buffers.allocated = 0;
	fh->v4l_buffers.ready_to_be_freed = 0;
}

/*
 *   Allocate the MJPEG grab buffers.
 *
 *   If the requested buffer size is smaller than MAX_KMALLOC_MEM,
 *   kmalloc is used to request a physically contiguous area,
 *   else we allocate the memory in framgents with get_zeroed_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 MAX_KMALLOC_MEM 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_zeroed_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 file *file)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;
	int i, j, off;
	unsigned long mem;

	/* we might have old buffers lying around */
	if (fh->jpg_buffers.ready_to_be_freed) {
		jpg_fbuffer_free(file);
	}

	for (i = 0; i < fh->jpg_buffers.num_buffers; i++) {
		if (fh->jpg_buffers.buffer[i].frag_tab)
			dprintk(2,
				KERN_WARNING
				"%s: jpg_fbuffer_alloc() - buffer %d allready allocated!?\n",
				ZR_DEVNAME(zr), i);

		/* Allocate fragment table for this buffer */

		mem = get_zeroed_page(GFP_KERNEL);
		if (mem == 0) {
			dprintk(1,
				KERN_ERR
				"%s: jpg_fbuffer_alloc() - get_zeroed_page (frag_tab) failed for buffer %d\n",
				ZR_DEVNAME(zr), i);
			jpg_fbuffer_free(file);
			return -ENOBUFS;
		}
		memset((void *) mem, 0, PAGE_SIZE);
		fh->jpg_buffers.buffer[i].frag_tab = (u32 *) mem;
		fh->jpg_buffers.buffer[i].frag_tab_bus =
		    virt_to_bus((void *) mem);

		//if (alloc_contig) {
		if (fh->jpg_buffers.need_contiguous) {
			mem =
			    (unsigned long) kmalloc(fh->jpg_buffers.
						    buffer_size,
						    GFP_KERNEL);
			if (mem == 0) {
				dprintk(1,
					KERN_ERR
					"%s: jpg_fbuffer_alloc() - kmalloc failed for buffer %d\n",
					ZR_DEVNAME(zr), i);
				jpg_fbuffer_free(file);
				return -ENOBUFS;
			}
			fh->jpg_buffers.buffer[i].frag_tab[0] =
			    virt_to_bus((void *) mem);
			fh->jpg_buffers.buffer[i].frag_tab[1] =
			    ((fh->jpg_buffers.buffer_size / 4) << 1) | 1;
			for (off = 0; off < fh->jpg_buffers.buffer_size;
			     off += PAGE_SIZE)
				SetPageReserved(MAP_NR(mem + off));
		} else {
			/* jpg_bufsize is allreay page aligned */
			for (j = 0;
			     j < fh->jpg_buffers.buffer_size / PAGE_SIZE;
			     j++) {
				mem = get_zeroed_page(GFP_KERNEL);
				if (mem == 0) {
					dprintk(1,
						KERN_ERR
						"%s: jpg_fbuffer_alloc() - get_zeroed_page failed for buffer %d\n",
						ZR_DEVNAME(zr), i);
					jpg_fbuffer_free(file);
					return -ENOBUFS;
				}

				fh->jpg_buffers.buffer[i].frag_tab[2 * j] =
				    virt_to_bus((void *) mem);
				fh->jpg_buffers.buffer[i].frag_tab[2 * j +
								   1] =
				    (PAGE_SIZE / 4) << 1;
				SetPageReserved(MAP_NR(mem));
			}

			fh->jpg_buffers.buffer[i].frag_tab[2 * j - 1] |= 1;
		}
	}

	dprintk(4,
		KERN_DEBUG "%s: jpg_fbuffer_alloc() - %d KB allocated\n",
		ZR_DEVNAME(zr),
		(fh->jpg_buffers.num_buffers *
		 fh->jpg_buffers.buffer_size) >> 10);

	fh->jpg_buffers.allocated = 1;

	return 0;
}

/* free the MJPEG grab buffers */
static void
jpg_fbuffer_free (struct file *file)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;
	int i, j, off;
	unsigned char *mem;

	dprintk(4, KERN_DEBUG "%s: jpg_fbuffer_free()\n", ZR_DEVNAME(zr));

	for (i = 0; i < fh->jpg_buffers.num_buffers; i++) {
		if (!fh->jpg_buffers.buffer[i].frag_tab)
			continue;

		//if (alloc_contig) {
		if (fh->jpg_buffers.need_contiguous) {
			if (fh->jpg_buffers.buffer[i].frag_tab[0]) {
				mem =
				    (unsigned char *) bus_to_virt(fh->
								  jpg_buffers.
								  buffer
								  [i].
								  frag_tab
								  [0]);
				for (off = 0;
				     off < fh->jpg_buffers.buffer_size;
				     off += PAGE_SIZE)
					ClearPageReserved(MAP_NR
							  (mem + off));
				kfree((void *) mem);
				fh->jpg_buffers.buffer[i].frag_tab[0] = 0;
				fh->jpg_buffers.buffer[i].frag_tab[1] = 0;
			}
		} else {
			for (j = 0;
			     j < fh->jpg_buffers.buffer_size / PAGE_SIZE;
			     j++) {
				if (!fh->jpg_buffers.buffer[i].
				    frag_tab[2 * j])
					break;
				ClearPageReserved(MAP_NR
						  (bus_to_virt
						   (fh->jpg_buffers.
						    buffer[i].frag_tab[2 *
								       j])));
				free_page((unsigned long)
					  bus_to_virt(fh->jpg_buffers.
						      buffer[i].
						      frag_tab[2 * j]));
				fh->jpg_buffers.buffer[i].frag_tab[2 * j] =
				    0;
				fh->jpg_buffers.buffer[i].frag_tab[2 * j +
								   1] = 0;
			}
		}

		free_page((unsigned long) fh->jpg_buffers.buffer[i].
			  frag_tab);
		fh->jpg_buffers.buffer[i].frag_tab = NULL;
	}

	fh->jpg_buffers.allocated = 0;
	fh->jpg_buffers.ready_to_be_freed = 0;
}

/*
 *   V4L Buffer grabbing
 */

static int
zoran_v4l_set_format (struct file               *file,
		      int                        width,
		      int                        height,
		      const struct zoran_format *format)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;
	int bpp;

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

	if (height < BUZ_MIN_HEIGHT || width < BUZ_MIN_WIDTH ||
	    height > BUZ_MAX_HEIGHT || width > BUZ_MAX_WIDTH) {
		dprintk(1,
			KERN_ERR
			"%s: v4l_set_format() - wrong frame size (%dx%d)\n",
			ZR_DEVNAME(zr), width, height);
		return -EINVAL;
	}

	bpp = (format->depth + 7) / 8;

	/* Check against available buffer size */
	if (height * width * bpp > fh->v4l_buffers.buffer_size) {
		dprintk(1,
			KERN_ERR
			"%s: v4l_set_format() - video buffer size (%d kB) is too small\n",
			ZR_DEVNAME(zr), fh->v4l_buffers.buffer_size >> 10);
		return -EINVAL;
	}

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

	if ((bpp == 2 && (width & 1)) || (bpp == 3 && (width & 3))) {
		dprintk(1,
			KERN_ERR
			"%s: v4l_set_format() - wrong frame alingment\n",
			ZR_DEVNAME(zr));
		return -EINVAL;
	}

	fh->v4l_settings.width = width;
	fh->v4l_settings.height = height;
	fh->v4l_settings.format = format;
	fh->v4l_settings.bytesperline = bpp * fh->v4l_settings.width;

	return 0;
}

static int
zoran_v4l_queue_frame (struct file *file,
		       int          num)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;
	unsigned long flags;
	int res = 0;

	if (!fh->v4l_buffers.allocated) {
		dprintk(1,
			KERN_ERR
			"%s: v4l_queue_frame() - buffers not yet allocated\n",
			ZR_DEVNAME(zr));
		res = -ENOMEM;
	}

	/* No grabbing outside the buffer range! */
	if (num >= fh->v4l_buffers.num_buffers || num < 0) {
		dprintk(1,
			KERN_ERR
			"%s: v4l_queue_frame() - buffer %d is out of range\n",
			ZR_DEVNAME(zr), num);
		res = -EINVAL;
	}

	spin_lock_irqsave(&zr->spinlock, flags);

	if (fh->v4l_buffers.active == ZORAN_FREE) {
		if (zr->v4l_buffers.active == ZORAN_FREE) {
			zr->v4l_buffers = fh->v4l_buffers;
			fh->v4l_buffers.active = ZORAN_ACTIVE;
		} else {
			dprintk(1,
				KERN_ERR
				"%s: v4l_queue_frame() - another session is already capturing\n",
				ZR_DEVNAME(zr));
			res = -EBUSY;
		}
	}

	/* make sure a grab isn't going on currently with this buffer */
	if (!res) {
		switch (zr->v4l_buffers.buffer[num].state) {
		default:
		case BUZ_STATE_PEND:
			if (zr->v4l_buffers.active == ZORAN_FREE) {
				fh->v4l_buffers.active = ZORAN_FREE;
				zr->v4l_buffers.allocated = 0;
			}
			res = -EBUSY;	/* what are you doing? */
			break;
		case BUZ_STATE_DONE:
			dprintk(2,
				KERN_WARNING
				"%s: v4l_queue_frame() - queueing buffer %d in state DONE!?\n",
				ZR_DEVNAME(zr), num);
		case BUZ_STATE_USER:
			/* 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] = num;
			zr->v4l_buffers.buffer[num].state = BUZ_STATE_PEND;
			zr->v4l_buffers.buffer[num].bs.length =
			    fh->v4l_settings.bytesperline *
			    zr->v4l_settings.height;
			fh->v4l_buffers.buffer[num] =
			    zr->v4l_buffers.buffer[num];
			break;
		}
	}

	spin_unlock_irqrestore(&zr->spinlock, flags);

	if (!res && zr->v4l_buffers.active == ZORAN_FREE)
		zr->v4l_buffers.active = fh->v4l_buffers.active;

	return res;
}

static int
v4l_grab (struct file       *file,
	  struct video_mmap *mp)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;
	int res = 0, i;

	for (i = 0; i < zoran_num_formats; i++) {
		if (zoran_formats[i].palette == mp->format &&
		    zoran_formats[i].flags & ZORAN_FORMAT_CAPTURE &&
		    !(zoran_formats[i].flags & ZORAN_FORMAT_COMPRESSED))
			break;
	}
	if (i == zoran_num_formats || zoran_formats[i].depth == 0) {
		dprintk(1,
			KERN_ERR
			"%s: v4l_grab() - wrong bytes-per-pixel format\n",
			ZR_DEVNAME(zr));
		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->v4l_settings.width != mp->width ||
	     zr->v4l_settings.height != mp->height ||
	     zr->v4l_settings.format->palette != mp->format)) {
		res = wait_grab_pending(zr);
		if (res)
			return res;
	}
	if ((res = zoran_v4l_set_format(file,
					mp->width,
					mp->height,
					&zoran_formats[i])))
		return res;
	zr->v4l_settings = fh->v4l_settings;

	/* queue the frame in the pending queue */
	if ((res = zoran_v4l_queue_frame(file, mp->frame))) {
		fh->v4l_buffers.active = ZORAN_FREE;
		return res;
	}

	/* put the 36057 into frame grabbing mode */
	if (!res && !zr->v4l_memgrab_active)
		zr36057_set_memgrab(zr, 1);

	//dprintk(4, KERN_INFO "%s: Frame grab 3...\n", ZR_DEVNAME(zr));

	return res;
}

/*
 * Sync on a V4L buffer
 */

static int
v4l_sync (struct file *file,
	  int          frame)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;
	unsigned long flags;

	if (fh->v4l_buffers.active == ZORAN_FREE) {
		dprintk(1,
			KERN_ERR
			"%s: v4l_sync() - no grab active for this session\n",
			ZR_DEVNAME(zr));
		return -EINVAL;
	}

	/* check passed-in frame number */
	if (frame >= fh->v4l_buffers.num_buffers || frame < 0) {
		dprintk(1,
			KERN_ERR "%s: v4l_sync() - frame %d is invalid\n",
			ZR_DEVNAME(zr), frame);
		return -EINVAL;
	}

	/* Check if is buffer was queued at all */
	if (zr->v4l_buffers.buffer[frame].state == BUZ_STATE_USER) {
		dprintk(1,
			KERN_ERR
			"%s: v4l_sync() - attempt to sync on a buffer which was not queued?\n",
			ZR_DEVNAME(zr));
		return -EPROTO;
	}

	/* wait on this buffer to get ready */
	while (zr->v4l_buffers.buffer[frame].state == BUZ_STATE_PEND) {
		if (!interruptible_sleep_on_timeout(&zr->v4l_capq, 10 * HZ))
			return -ETIME;
		else if (signal_pending(current))
			return -ERESTARTSYS;
	}

	/* buffer should now be in BUZ_STATE_DONE */
	if (zr->v4l_buffers.buffer[frame].state != BUZ_STATE_DONE)
		dprintk(2,
			KERN_ERR "%s: v4l_sync() - internal state error\n",
			ZR_DEVNAME(zr));

	zr->v4l_buffers.buffer[frame].state = BUZ_STATE_USER;
	fh->v4l_buffers.buffer[frame] = zr->v4l_buffers.buffer[frame];

	spin_lock_irqsave(&zr->spinlock, flags);

	/* Check if streaming capture has finished */
	if (zr->v4l_pend_tail == zr->v4l_pend_head) {
		zr36057_set_memgrab(zr, 0);
		if (zr->v4l_buffers.active == ZORAN_ACTIVE) {
			fh->v4l_buffers.active = zr->v4l_buffers.active =
			    ZORAN_FREE;
			zr->v4l_buffers.allocated = 0;
		}
	}

	spin_unlock_irqrestore(&zr->spinlock, flags);

	return 0;
}

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

static int
zoran_jpg_queue_frame (struct file          *file,
		       int                   num,
		       enum zoran_codec_mode mode)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;
	unsigned long flags;
	int res = 0;

	/* Check if buffers are allocated */
	if (!fh->jpg_buffers.allocated) {
		dprintk(1,
			KERN_ERR
			"%s: jpg_queue_frame() - buffers not yet allocated\n",
			ZR_DEVNAME(zr));
		return -ENOMEM;
	}

	/* No grabbing outside the buffer range! */
	if (num >= fh->jpg_buffers.num_buffers || num < 0) {
		dprintk(1,
			KERN_ERR
			"%s: jpg_queue_frame() - buffer %d out of range\n",
			ZR_DEVNAME(zr), num);
		return -EINVAL;
	}

	/* what is the codec mode right now? */
	if (zr->codec_mode == BUZ_MODE_IDLE) {
		zr->jpg_settings = fh->jpg_settings;
	} else if (zr->codec_mode != mode) {
		/* wrong codec mode active - invalid */
		dprintk(1,
			KERN_ERR
			"%s: jpg_queue_frame() - codec in wrong mode\n",
			ZR_DEVNAME(zr));
		return -EINVAL;
	}

	spin_lock_irqsave(&zr->spinlock, flags);

	if (fh->jpg_buffers.active == ZORAN_FREE) {
		if (zr->jpg_buffers.active == ZORAN_FREE) {
			zr->jpg_buffers = fh->jpg_buffers;
			fh->jpg_buffers.active = ZORAN_ACTIVE;
		} else {
			dprintk(1,
				KERN_ERR
				"%s: jpg_queue_frame() - another session is already capturing\n",
				ZR_DEVNAME(zr));
			res = -EBUSY;
		}
	}

	if (!res && zr->codec_mode == BUZ_MODE_IDLE) {
		/* Ok load up the jpeg codec */
		zr36057_enable_jpg(zr, mode);
	}

	if (!res) {
		switch (zr->jpg_buffers.buffer[num].state) {
		case BUZ_STATE_DONE:
			dprintk(2,
				KERN_WARNING
				"%s: jpg_queue_frame() - queing frame in BUZ_STATE_DONE state!?\n",
				ZR_DEVNAME(zr));
		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] =
			    num;
			zr->jpg_buffers.buffer[num].state = BUZ_STATE_PEND;
			fh->jpg_buffers.buffer[num] =
			    zr->jpg_buffers.buffer[num];
			zoran_feed_stat_com(zr);
			break;
		default:
		case BUZ_STATE_DMA:
		case BUZ_STATE_PEND:
			if (zr->jpg_buffers.active == ZORAN_FREE) {
				fh->jpg_buffers.active = ZORAN_FREE;
				zr->jpg_buffers.allocated = 0;
			}
			res = -EBUSY;	/* what are you doing? */
			break;
		}
	}

	spin_unlock_irqrestore(&zr->spinlock, flags);

	if (!res && zr->jpg_buffers.active == ZORAN_FREE) {
		zr->jpg_buffers.active = fh->jpg_buffers.active;
	}

	return res;
}

static int
jpg_qbuf (struct file          *file,
	  int                   frame,
	  enum zoran_codec_mode mode)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;
	int res = 0;

	/* Does the user want to stop streaming? */
	if (frame < 0) {
		if (zr->codec_mode == mode) {
			if (fh->jpg_buffers.active == ZORAN_FREE) {
				dprintk(1,
					KERN_ERR
					"%s: jpg_qbuf(-1) - session not active\n",
					ZR_DEVNAME(zr));
				return -EINVAL;
			}
			fh->jpg_buffers.active = zr->jpg_buffers.active =
			    ZORAN_FREE;
			zr->jpg_buffers.allocated = 0;
			zr36057_enable_jpg(zr, BUZ_MODE_IDLE);
			return 0;
		} else {
			dprintk(1,
				KERN_ERR
				"%s: jpg_qbuf() - stop streaming but not in streaming mode\n",
				ZR_DEVNAME(zr));
			return -EINVAL;
		}
	}

	if ((res = zoran_jpg_queue_frame(file, frame, mode)))
		return res;

	/* Start the jpeg codec when the first frame is queued  */
	if (!res && zr->jpg_que_head == 1)
		jpeg_start(zr);

	return res;
}

/*
 *   Sync on a MJPEG buffer
 */

static int
jpg_sync (struct file       *file,
	  struct zoran_sync *bs)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;
	unsigned long flags;
	int frame, timeout;

	if (fh->jpg_buffers.active == ZORAN_FREE) {
		dprintk(1,
			KERN_ERR
			"%s: jpg_sync() - capture is not currently active\n",
			ZR_DEVNAME(zr));
		return -EINVAL;
	}
	if (zr->codec_mode != BUZ_MODE_MOTION_DECOMPRESS &&
	    zr->codec_mode != BUZ_MODE_MOTION_COMPRESS) {
		dprintk(1,
			KERN_ERR
			"%s: jpg_sync() - codec not in streaming mode\n",
			ZR_DEVNAME(zr));
		return -EINVAL;
	}
	while (zr->jpg_que_tail == zr->jpg_dma_tail) {
		if (zr->jpg_dma_tail == zr->jpg_dma_head)
			break;

		timeout =
		    interruptible_sleep_on_timeout(&zr->jpg_capq, 10 * HZ);
		if (!timeout) {
			int isr;

			btand(~ZR36057_JMC_Go_en, ZR36057_JMC);
			udelay(1);
			zr->codec->control(zr->codec, CODEC_G_STATUS,
					   sizeof(isr), &isr);
			dprintk(1,
				KERN_ERR
				"%s: jpg_sync() - timeout: codec isr=0x%02x\n",
				ZR_DEVNAME(zr), isr);

			return -ETIME;

		} else if (signal_pending(current))
			return -ERESTARTSYS;
	}

	spin_lock_irqsave(&zr->spinlock, flags);

	if (zr->jpg_dma_tail != zr->jpg_dma_head)
		frame = zr->jpg_pend[zr->jpg_que_tail++ & BUZ_MASK_FRAME];
	else
		frame = zr->jpg_pend[zr->jpg_que_tail & BUZ_MASK_FRAME];

	/* buffer should now be in BUZ_STATE_DONE */
	if (*zr_debug > 0)
		if (zr->jpg_buffers.buffer[frame].state != BUZ_STATE_DONE)
			dprintk(2,
				KERN_ERR
				"%s: jpg_sync() - internal state error\n",
				ZR_DEVNAME(zr));

	*bs = zr->jpg_buffers.buffer[frame].bs;
	bs->frame = frame;
	zr->jpg_buffers.buffer[frame].state = BUZ_STATE_USER;
	fh->jpg_buffers.buffer[frame] = zr->jpg_buffers.buffer[frame];

	spin_unlock_irqrestore(&zr->spinlock, flags);

	return 0;
}

static void
zoran_open_init_session (struct file *file)
{
	int i;
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;

	/* Per default, map the V4L Buffers */
	fh->map_mode = ZORAN_MAP_MODE_RAW;

	/* take over the card's current settings */
	fh->overlay_settings = zr->overlay_settings;
	fh->overlay_settings.is_set = 0;
	fh->overlay_settings.format = zr->overlay_settings.format;
	fh->overlay_active = ZORAN_FREE;

	/* v4l settings */
	fh->v4l_settings = zr->v4l_settings;

	/* v4l_buffers */
	memset(&fh->v4l_buffers, 0, sizeof(struct zoran_v4l_struct));
	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
		fh->v4l_buffers.buffer[i].state = BUZ_STATE_USER;	/* nothing going on */
		fh->v4l_buffers.buffer[i].bs.frame = i;
	}
	fh->v4l_buffers.allocated = 0;
	fh->v4l_buffers.ready_to_be_freed = 0;
	fh->v4l_buffers.active = ZORAN_FREE;
	fh->v4l_buffers.buffer_size = v4l_bufsize;
	fh->v4l_buffers.num_buffers = v4l_nbufs;

	/* jpg settings */
	fh->jpg_settings = zr->jpg_settings;

	/* jpg_buffers */
	memset(&fh->jpg_buffers, 0, sizeof(struct zoran_jpg_struct));
	for (i = 0; i < BUZ_MAX_FRAME; i++) {
		fh->jpg_buffers.buffer[i].state = BUZ_STATE_USER;	/* nothing going on */
		fh->jpg_buffers.buffer[i].bs.frame = i;
	}
	fh->jpg_buffers.need_contiguous = zr->jpg_buffers.need_contiguous;
	fh->jpg_buffers.allocated = 0;
	fh->jpg_buffers.ready_to_be_freed = 0;
	fh->jpg_buffers.active = ZORAN_FREE;
	fh->jpg_buffers.buffer_size = jpg_bufsize;
	fh->jpg_buffers.num_buffers = jpg_nbufs;
}

static void
zoran_close_end_session (struct file *file)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;

	/* overlay */
	if (fh->overlay_active != ZORAN_FREE) {
		fh->overlay_active = zr->overlay_active = ZORAN_FREE;
		zr->v4l_overlay_active = 0;
		if (!zr->v4l_memgrab_active)
			zr36057_overlay(zr, 0);
		zr->overlay_mask = NULL;
	}

	/* v4l capture */
	if (fh->v4l_buffers.active != ZORAN_FREE) {
		zr36057_set_memgrab(zr, 0);
		zr->v4l_buffers.allocated = 0;
		zr->v4l_buffers.active = fh->v4l_buffers.active =
		    ZORAN_FREE;
	}

	/* v4l buffers */
	if (fh->v4l_buffers.allocated ||
	    fh->v4l_buffers.ready_to_be_freed) {
		v4l_fbuffer_free(file);
	}

	/* jpg capture */
	if (fh->jpg_buffers.active != ZORAN_FREE) {
		zr36057_enable_jpg(zr, BUZ_MODE_IDLE);
		zr->jpg_buffers.allocated = 0;
		zr->jpg_buffers.active = fh->jpg_buffers.active =
		    ZORAN_FREE;
	}

	/* jpg buffers */
	if (fh->jpg_buffers.allocated ||
	    fh->jpg_buffers.ready_to_be_freed) {
		jpg_fbuffer_free(file);
	}
}

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

static int
zoran_open (struct inode *inode,
	    struct file  *file)
{
	unsigned int minor = iminor(inode);
	struct zoran *zr = NULL;
	struct zoran_fh *fh;
	int i, res, first_open = 0, have_module_locks = 0;

	/* find the device */
	for (i = 0; i < zoran_num; i++) {
		if (zoran[i].video_dev->minor == minor) {
			zr = &zoran[i];
			break;
		}
	}

	if (!zr) {
		dprintk(1, KERN_ERR "%s: device not found!\n", ZORAN_NAME);
		res = -ENODEV;
		goto open_unlock_and_return;
	}

	/* see fs/device.c - the kernel already locks during open(),
	 * so locking ourselves only causes deadlocks */
	/*down(&zr->resource_lock);*/

	if (!zr->decoder) {
		dprintk(1,
			KERN_ERR "%s: no TV decoder loaded for device!\n",
			ZR_DEVNAME(zr));
		res = -EIO;
		goto open_unlock_and_return;
	}

	/* try to grab a module lock */
	if (!try_module_get(THIS_MODULE)) {
		dprintk(1,
			KERN_ERR
			"%s: failed to acquire my own lock! PANIC!\n",
			ZR_DEVNAME(zr));
		res = -ENODEV;
		goto open_unlock_and_return;
	}
	if (!try_module_get(zr->decoder->driver->owner)) {
		dprintk(1,
			KERN_ERR
			"%s: failed to grab ownership of i2c decoder\n",
			ZR_DEVNAME(zr));
		res = -EIO;
		module_put(THIS_MODULE);
		goto open_unlock_and_return;
	}
	if (zr->encoder &&
	    !try_module_get(zr->encoder->driver->owner)) {
		dprintk(1,
			KERN_ERR
			"%s: failed to grab ownership of i2c encoder\n",
			ZR_DEVNAME(zr));
		res = -EIO;
		module_put(zr->decoder->driver->owner);
		module_put(THIS_MODULE);
		goto open_unlock_and_return;
	}

	have_module_locks = 1;

	if (zr->user >= 2048) {
		dprintk(1, KERN_ERR "%s: too many users (%d) on device\n",
			ZR_DEVNAME(zr), zr->user);
		res = -EBUSY;
		goto open_unlock_and_return;
	}

	dprintk(1, KERN_INFO "%s: zoran_open(%s, pid=[%d]), users(-)=%d\n",
		ZR_DEVNAME(zr), current->comm, current->pid, zr->user);

	/* now, create the open()-specific file_ops struct */
	fh = kmalloc(sizeof(struct zoran_fh), GFP_KERNEL);
	if (!fh) {
		dprintk(1,
			KERN_ERR
			"%s: zoran_open() - allocation of zoran_fh failed\n",
			ZR_DEVNAME(zr));
		res = -ENOMEM;
		goto open_unlock_and_return;
	}
	memset(fh, 0, sizeof(struct zoran_fh));
	/* used to be BUZ_MAX_WIDTH/HEIGHT, but that gives overflows
	 * on norm-change! */
	fh->overlay_mask =
	    kmalloc(((768 + 31) / 32) * 576 * 4, GFP_KERNEL);
	if (!fh->overlay_mask) {
		dprintk(1,
			KERN_ERR
			"%s: zoran_open() - allocation of overlay_mask failed\n",
			ZR_DEVNAME(zr));
		kfree(fh);
		res = -ENOMEM;
		goto open_unlock_and_return;
	}

	if (zr->user++ == 0)
		first_open = 1;

	/*up(&zr->resource_lock);*/

	/* default setup - TODO: look at flags */
	if (first_open) {	/* First device open */
		zr36057_restart(zr);
		zoran_open_init_params(zr);
		zoran_init_hardware(zr);

		btor(ZR36057_ICR_IntPinEn, ZR36057_ICR);
	}

	/* set file_ops stuff */
	file->private_data = fh;
	fh->zr = zr;
	zoran_open_init_session(file);

	return 0;

open_unlock_and_return:
	/* if we grabbed locks, release them accordingly */
	if (have_module_locks) {
		module_put(zr->decoder->driver->owner);
		if (zr->encoder) {
			module_put(zr->encoder->driver->owner);
		}
		module_put(THIS_MODULE);
	}

	/* if there's no device found, we didn't obtain the lock either */
	if (zr) {
		/*up(&zr->resource_lock);*/
	}

	return res;
}

static int
zoran_close (struct inode *inode,
	     struct file  *file)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;

	dprintk(1, KERN_INFO "%s: zoran_close(%s, pid=[%d]), users(+)=%d\n",
		ZR_DEVNAME(zr), current->comm, current->pid, zr->user);

	/* kernel locks (fs/device.c), so don't do that ourselves
	 * (prevents deadlocks) */
	/*down(&zr->resource_lock);*/

	zoran_close_end_session(file);

	if (zr->user-- == 1) {	/* Last process */
		/* Clean up JPEG process */
		wake_up_interruptible(&zr->jpg_capq);
		zr36057_enable_jpg(zr, BUZ_MODE_IDLE);
		zr->jpg_buffers.allocated = 0;
		zr->jpg_buffers.active = ZORAN_FREE;

		/* disable interrupts */
		btand(~ZR36057_ICR_IntPinEn, ZR36057_ICR);

		if (*zr_debug > 1)
			print_interrupts(zr);

		/* Overlay off */
		zr->v4l_overlay_active = 0;
		zr36057_overlay(zr, 0);
		zr->overlay_mask = NULL;

		/* capture off */
		wake_up_interruptible(&zr->v4l_capq);
		zr36057_set_memgrab(zr, 0);
		zr->v4l_buffers.allocated = 0;
		zr->v4l_buffers.active = ZORAN_FREE;
		zoran_set_pci_master(zr, 0);

		if (!pass_through) {	/* Switch to color bar */
			int zero = 0, two = 2;
			decoder_command(zr, DECODER_ENABLE_OUTPUT, &zero);
			encoder_command(zr, ENCODER_SET_INPUT, &two);
		}
	}

	file->private_data = NULL;
	kfree(fh->overlay_mask);
	kfree(fh);

	/* release locks on the i2c modules */
	module_put(zr->decoder->driver->owner);
	if (zr->encoder) {
		 module_put(zr->encoder->driver->owner);
	}
	module_put(THIS_MODULE);

	/*up(&zr->resource_lock);*/

	dprintk(4, KERN_INFO "%s: zoran_close() done\n", ZR_DEVNAME(zr));

	return 0;
}


static ssize_t
zoran_read (struct file *file,
	    char        *data,
	    size_t       count,
	    loff_t      *ppos)
{
	/* we simply don't support read() (yet)... */

	return -EINVAL;
}

static ssize_t
zoran_write (struct file *file,
	     const char  *data,
	     size_t       count,
	     loff_t      *ppos)
{
	/* ...and the same goes for write() */

	return -EINVAL;
}

static int
setup_fbuffer (struct file               *file,
	       void                      *base,
	       const struct zoran_format *fmt,
	       int                        width,
	       int                        height,
	       int                        bytesperline)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;

	/* (Ronald) v4l/v4l2 guidelines */
	if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
		return -EPERM;

	/* we need a bytesperline value, even if not given */
	if (!bytesperline)
		bytesperline = width * ((fmt->depth + 7) & ~7) / 8;

#if 0
	if (zr->overlay_active) {
		/* dzjee... stupid users... don't even bother to turn off
		 * overlay before changing the memory location...
		 * normally, we would return errors here. However, one of
		 * the tools that does this is... xawtv! and since xawtv
		 * is used by +/- 99% of the users, we'd rather be user-
		 * friendly and silently do as if nothing went wrong */
		dprintk(3,
			KERN_ERR
			"%s: setup_fbuffer() - forced overlay turnoff because framebuffer changed\n",
			ZR_DEVNAME(zr));
		zr36057_overlay(zr, 0);
	}
#endif

	if (!(fmt->flags & ZORAN_FORMAT_OVERLAY)) {
		dprintk(1,
			KERN_ERR
			"%s: setup_fbuffer() - no valid overlay format given\n",
			ZR_DEVNAME(zr));
		return -EINVAL;
	}
	if (height <= 0 || width <= 0 || bytesperline <= 0) {
		dprintk(1,
			KERN_ERR
			"%s: setup_fbuffer() - invalid height/width/bpl value (%d|%d|%d)\n",
			ZR_DEVNAME(zr), width, height, bytesperline);
		return -EINVAL;
	}
	if (bytesperline & 3) {
		dprintk(1,
			KERN_ERR
			"%s: setup_fbuffer() - bytesperline (%d) must be 4-byte aligned\n",
			ZR_DEVNAME(zr), bytesperline);
		return -EINVAL;
	}

	zr->buffer.base = (void *) ((unsigned long) base & ~3);
	zr->buffer.height = height;
	zr->buffer.width = width;
	zr->buffer.depth = fmt->depth;
	zr->overlay_settings.format = fmt;
	zr->buffer.bytesperline = bytesperline;

	/* The user should set new window parameters */
	zr->overlay_settings.is_set = 0;

	return 0;
}


static int
setup_window (struct file       *file,
	      int                x,
	      int                y,
	      int                width,
	      int                height,
	      struct video_clip *clips,
	      int                clipcount,
	      void              *bitmap)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;
	struct video_clip *vcp = NULL;
	int on, end;


	if (!zr->buffer.base) {
		dprintk(1,
			KERN_ERR
			"%s: setup_window() - frame buffer has to be set first\n",
			ZR_DEVNAME(zr));
		return -EINVAL;
	}

	if (!fh->overlay_settings.format) {
		dprintk(1,
			KERN_ERR
			"%s: setup_window() - no overlay format set\n",
			ZR_DEVNAME(zr));
		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 = (x + width) & ~1;	/* round down */
		x = (x + 1) & ~1;	/* round up */
		width = end - x;
	}

	if (zr->buffer.depth == 24) {
		end = (x + width) & ~3;	/* round down */
		x = (x + 3) & ~3;	/* round up */
		width = end - x;
	}

	if (width > BUZ_MAX_WIDTH)
		width = BUZ_MAX_WIDTH;
	if (height > BUZ_MAX_HEIGHT)
		height = BUZ_MAX_HEIGHT;

	/* Check for vaild parameters */
	if (width < BUZ_MIN_WIDTH || height < BUZ_MIN_HEIGHT ||
	    width > BUZ_MAX_WIDTH || height > BUZ_MAX_HEIGHT) {
		dprintk(1,
			KERN_ERR
			"%s: setup_window() - width = %d or height = %d invalid\n",
			ZR_DEVNAME(zr), width, height);
		return -EINVAL;
	}

	fh->overlay_settings.x = x;
	fh->overlay_settings.y = y;
	fh->overlay_settings.width = width;
	fh->overlay_settings.height = height;
	fh->overlay_settings.clipcount = 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 &&
	    zr->overlay_active != ZORAN_FREE &&
	    fh->overlay_active != ZORAN_FREE;
	if (on)
		zr36057_overlay(zr, 0);

	/*
	 *   Write the overlay mask if clips are wanted.
	 *   We prefer a bitmap.
	 */
	if (bitmap) {
		/* fake value - it just means we want clips */
		fh->overlay_settings.clipcount = 1;

		if (copy_from_user(fh->overlay_mask, bitmap,
				   (width * height + 7) / 8)) {
			return -EFAULT;
		}
	} else if (clipcount > 0) {
		/* write our own bitmap from the clips */
		vcp = vmalloc(sizeof(struct video_clip) * (clipcount + 4));
		if (vcp == NULL) {
			dprintk(1,
				KERN_ERR
				"%s: setup_window() - Alloc of clip mask failed\n",
				ZR_DEVNAME(zr));
			return -ENOMEM;
		}
		if (copy_from_user
		    (vcp, clips, sizeof(struct video_clip) * clipcount)) {
			vfree(vcp);
			return -EFAULT;
		}
		write_overlay_mask(file, vcp, clipcount);
		vfree(vcp);
	}

	fh->overlay_settings.is_set = 1;
	if (fh->overlay_active != ZORAN_FREE &&
	    zr->overlay_active != ZORAN_FREE)
		zr->overlay_settings = fh->overlay_settings;

	if (on)
		zr36057_overlay(zr, 1);

	/* Make sure the changes come into effect */
	return wait_grab_pending(zr);
}

static int
setup_overlay (struct file *file,
	       int          on)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;

	/* If there is nothing to do, return immediatly */
	if ((on && fh->overlay_active != ZORAN_FREE) ||
	    (!on && fh->overlay_active == ZORAN_FREE))
		return 0;

	/* check whether we're touching someone else's overlay */
	if (on && zr->overlay_active != ZORAN_FREE &&
	    fh->overlay_active == ZORAN_FREE) {
		dprintk(1,
			KERN_ERR
			"%s: setup_overlay() - overlay is already active for another session\n",
			ZR_DEVNAME(zr));
		return -EBUSY;
	}
	if (!on && zr->overlay_active != ZORAN_FREE &&
	    fh->overlay_active == ZORAN_FREE) {
		dprintk(1,
			KERN_ERR
			"%s: setup_overlay() - you cannot cancel someone else's session\n",
			ZR_DEVNAME(zr));
		return -EPERM;
	}

	if (on == 0) {
		zr->overlay_active = fh->overlay_active = ZORAN_FREE;
		zr->v4l_overlay_active = 0;
		/* When a grab is running, the video simply
		 * won't be switched on any more */
		if (!zr->v4l_memgrab_active)
			zr36057_overlay(zr, 0);
		zr->overlay_mask = NULL;
	} else {
		if (!zr->buffer.base || !fh->overlay_settings.is_set) {
			dprintk(1,
				KERN_ERR
				"%s: setup_overlay() - buffer or window not set\n",
				ZR_DEVNAME(zr));
			return -EINVAL;
		}
		if (!fh->overlay_settings.format) {
			dprintk(1,
				KERN_ERR
				"%s: setup_overlay() - no overlay format set\n",
				ZR_DEVNAME(zr));
			return -EINVAL;
		}
		zr->overlay_active = fh->overlay_active = ZORAN_LOCKED;
		zr->v4l_overlay_active = 1;
		zr->overlay_mask = fh->overlay_mask;
		zr->overlay_settings = fh->overlay_settings;
		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 */
	return wait_grab_pending(zr);
}

#ifdef HAVE_V4L2
	/* get the status of a buffer in the clients buffer queue */
static int
zoran_v4l2_buffer_status (struct file        *file,
			  struct v4l2_buffer *buf,
			  int                 num)
{
	struct zoran_fh *fh = file->private_data;
	struct zoran *zr = fh->zr;

	buf->flags = V4L2_BUF_FLAG_MAPPED;

	switch (fh->map_mode) {
	case ZORAN_MAP_MODE_RAW:

		/* check range */
		if (num < 0 || num >= fh->v4l_buffers.num_buffers ||
		    !fh->v4l_buffers.allocated) {
			dprintk(1,
				KERN_ERR
				"%s: v4l2_buffer_status() - wrong number or buffers not allocated\n",
				ZR_DEVNAME(zr));
			return -EINVAL;
		}

		buf->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
		buf->length = fh->v4l_buffers.buffer_size;

		/* get buffer */
		buf->bytesused = fh->v4l_buffers.buffer[num].bs.length;
		if (fh->v4l_buffers.buffer[num].state == BUZ_STATE_DONE ||
		    fh->v4l_buffers.buffer[num].state == BUZ_STATE_USER) {
			buf->sequence = fh->v4l_buffers.buffer[num].bs.seq;
			buf->flags |= V4L2_BUF_FLAG_DONE;
			buf->timestamp =
			    fh->v4l_buffers.buffer[num].bs.timestamp;
		} else {
			buf->flags |= V4L2_BUF_FLAG_QUEUED;
		}

		if (fh->v4l_settings.height <= BUZ_MAX_HEIGHT / 2)
			buf->field = V4L2_FIELD_TOP;
		else
			buf->field = V4L2_FIELD_INTERLACED;

		break;

	case ZORAN_MAP_MODE_JPG_REC:
	case ZORAN_MAP_MODE_JPG_PLAY:

		/* check range */
		if (num < 0 || num >= fh->jpg_buffers.num_buffers ||
		    !fh->jpg_buffers.allocated) {
			dprintk(1,
				KERN_ERR
				"%s: v4l2_buffer_status() - wrong number or buffers not allocated\n",
				ZR_DEVNAME(zr));
			return -EINVAL;
		}

		buf->type = (fh->map_mode == ZORAN_MAP_MODE_JPG_REC) ?
			      V4L2_BUF_TYPE_VIDEO_CAPTURE :
			      V4L2_BUF_TYPE_VIDEO_OUTPUT;
		buf->length = fh->jpg_buffers.buffer_size;

		/* these variables are only written after frame has been captured */
		if (fh->jpg_buffers.buffer[num].state == BUZ_STATE_DONE ||
		    fh->jpg_buffers.buffer[num].state == BUZ_STATE_USER) {
			buf->sequence = fh->jpg_buffers.buffer[num].bs.seq;
			buf->timestamp =
			    fh->jpg_buffers.buffer[num].bs.timestamp;
			buf->bytesused =
			    fh->jpg_buffers.buffer[num].bs.length;
			buf->flags |= V4L2_BUF_FLAG_DONE;
		} else {
			buf->flags |= V4L2_BUF_FLAG_QUEUED;
		}

		/* which fields are these? */
		if (fh->jpg_settings.TmpDcm != 1)
			buf->field =
			    fh->jpg_settings.
			    odd_even ? V4L2_FIELD_TOP : V4L2_FIELD_BOTTOM;
		else
			buf->field =
			    fh->jpg_settings.
			    odd_even ? V4L2_FIELD_SEQ_TB :
			    V4L2_FIELD_SEQ_BT;

		break;

	default:

		dprintk(5,
			KERN_ERR
			"%s: v4l2_buffer_status() - invalid buffer type|map_mode (%d|%d)\n",
			ZR_DEVNAME(zr), buf->type, fh->map_mode);
		return -EINVAL;
	}

	buf->memory = V4L2_MEMORY_MMAP;
	buf->index = num;
	buf->m.offset = buf->length * num;

	return 0;
}
#endif

static int
zoran_set_norm (struct zoran *zr,
	        int           norm) /* VIDEO_MODE_* */
{
	int norm_encoder, on;

	if (zr->v4l_buffers.active != ZORAN_FREE ||
	    zr->jpg_buffers.active != ZORAN_FREE) {
		dprintk(1,
			KERN_WARNING
			"%s: set_norm() called while in playback/capture mode\n",
			ZR_DEVNAME(zr));
		return -EBUSY;
	}

	if (lock_norm && norm != zr->norm) {
		if (lock_norm > 1) {
			dprintk(1,
				KERN_WARNING
				"%s: set_norm() - TV standard is locked, can not switch norm\n",
				ZR_DEVNAME(zr));
			return -EPERM;
		} else {
			dprintk(1,
				KERN_WARNING
				"%s: set_norm() - TV standard is locked, norm was not changed\n",
				ZR_DEVNAME(zr));
			norm = zr->norm;
		}
	}

	if (norm != VIDEO_MODE_AUTO &&
	    (norm < 0 || norm >= zr->card.norms ||
	     !zr->card.tvn[norm])) {
		dprintk(1,
			KERN_ERR "%s: set_norm() - unsupported norm %d\n",
			ZR_DEVNAME(zr), norm);
		return -EINVAL;
	}

	if (norm == VIDEO_MODE_AUTO) {
		int status;

		/* if we have autodetect, ... */
		struct video_decoder_capability caps;
		decoder_command(zr, DECODER_GET_CAPABILITIES, &caps);
		if (!(caps.flags & VIDEO_DECODER_AUTO)) {
			dprintk(1, KERN_ERR "%s: norm=auto unsupported\n",
				ZR_DEVNAME(zr));
			return -EINVAL;
		}

		decoder_command(zr, DECODER_SET_NORM, &norm);

		/* let changes come into effect */
		current->state = TASK_UNINTERRUPTIBLE;
		schedule_timeout(2 * HZ);

		decoder_command(zr, DECODER_GET_STATUS, &status);
		if (!(status & DECODER_STATUS_GOOD)) {
			dprintk(1,
				KERN_ERR
				"%s: set_norm() - no norm detected\n",
				ZR_DEVNAME(zr));
			/* reset norm */
			decoder_command(zr, DECODER_SET_NORM, &zr->norm);
			return -EIO;
		}

		if (status & DECODER_STATUS_NTSC)
			norm = VIDEO_MODE_NTSC;
		else if (status & DECODER_STATUS_SECAM)
			norm = VIDEO_MODE_SECAM;
		else
			norm = VIDEO_MODE_PAL;
	}
	zr->timing = zr->card.tvn[norm];
	norm_encoder = norm;

	/* We switch overlay…