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usbvision-core.c

/*
 * usbvision-core.c - driver for NT100x USB video capture devices
 *
 *
 * Copyright (c) 1999-2005 Joerg Heckenbach <joerg@heckenbach-aw.de>
 *                         Dwaine Garden <dwainegarden@rogers.com>
 *
 * This module is part of usbvision driver project.
 * Updates to driver completed by Dwaine P. Garden
 *
 * 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/kernel.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/utsname.h>
#include <linux/highmem.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <asm/io.h>
#include <linux/videodev2.h>
#include <linux/i2c.h>

#include <media/saa7115.h>
#include <media/v4l2-common.h>
#include <media/tuner.h>

#include <linux/workqueue.h>

#include "usbvision.h"

static unsigned int core_debug;
module_param(core_debug,int,0644);
MODULE_PARM_DESC(core_debug,"enable debug messages [core]");

static unsigned int force_testpattern;
module_param(force_testpattern,int,0644);
MODULE_PARM_DESC(force_testpattern,"enable test pattern display [core]");

static int adjustCompression = 1;   /* Set the compression to be adaptive */
module_param(adjustCompression, int, 0444);
MODULE_PARM_DESC(adjustCompression, " Set the ADPCM compression for the device.  Default: 1 (On)");

/* To help people with Black and White output with using s-video input.
 * Some cables and input device are wired differently. */
static int SwitchSVideoInput;
module_param(SwitchSVideoInput, int, 0444);
MODULE_PARM_DESC(SwitchSVideoInput, " Set the S-Video input.  Some cables and input device are wired differently. Default: 0 (Off)");

static unsigned int adjust_X_Offset = -1;
module_param(adjust_X_Offset, int, 0644);
MODULE_PARM_DESC(adjust_X_Offset, "adjust X offset display [core]");

static unsigned int adjust_Y_Offset = -1;
module_param(adjust_Y_Offset, int, 0644);
MODULE_PARM_DESC(adjust_Y_Offset, "adjust Y offset display [core]");


#define     ENABLE_HEXDUMP    0     /* Enable if you need it */


#ifdef USBVISION_DEBUG
      #define PDEBUG(level, fmt, args...) { \
            if (core_debug & (level)) \
                  printk(KERN_INFO KBUILD_MODNAME ":[%s:%d] " fmt, \
                        __func__, __LINE__ , ## args); \
      }
#else
      #define PDEBUG(level, fmt, args...) do {} while(0)
#endif

#define DBG_HEADER      1<<0
#define DBG_IRQ         1<<1
#define DBG_ISOC  1<<2
#define DBG_PARSE 1<<3
#define DBG_SCRATCH     1<<4
#define DBG_FUNC  1<<5

static const int max_imgwidth = MAX_FRAME_WIDTH;
static const int max_imgheight = MAX_FRAME_HEIGHT;
static const int min_imgwidth = MIN_FRAME_WIDTH;
static const int min_imgheight = MIN_FRAME_HEIGHT;

/* The value of 'scratch_buf_size' affects quality of the picture
 * in many ways. Shorter buffers may cause loss of data when client
 * is too slow. Larger buffers are memory-consuming and take longer
 * to work with. This setting can be adjusted, but the default value
 * should be OK for most desktop users.
 */
#define DEFAULT_SCRATCH_BUF_SIZE    (0x20000)         // 128kB memory scratch buffer
static const int scratch_buf_size = DEFAULT_SCRATCH_BUF_SIZE;

// Function prototypes
static int usbvision_request_intra (struct usb_usbvision *usbvision);
static int usbvision_unrequest_intra (struct usb_usbvision *usbvision);
static int usbvision_adjust_compression (struct usb_usbvision *usbvision);
static int usbvision_measure_bandwidth (struct usb_usbvision *usbvision);

/*******************************/
/* Memory management functions */
/*******************************/

/*
 * Here we want the physical address of the memory.
 * This is used when initializing the contents of the area.
 */

static void *usbvision_rvmalloc(unsigned long size)
{
      void *mem;
      unsigned long adr;

      size = PAGE_ALIGN(size);
      mem = vmalloc_32(size);
      if (!mem)
            return NULL;

      memset(mem, 0, size); /* Clear the ram out, no junk to the user */
      adr = (unsigned long) mem;
      while (size > 0) {
            SetPageReserved(vmalloc_to_page((void *)adr));
            adr += PAGE_SIZE;
            size -= PAGE_SIZE;
      }

      return mem;
}

static void usbvision_rvfree(void *mem, unsigned long size)
{
      unsigned long adr;

      if (!mem)
            return;

      size = PAGE_ALIGN(size);

      adr = (unsigned long) mem;
      while ((long) size > 0) {
            ClearPageReserved(vmalloc_to_page((void *)adr));
            adr += PAGE_SIZE;
            size -= PAGE_SIZE;
      }

      vfree(mem);
}


#if ENABLE_HEXDUMP
static void usbvision_hexdump(const unsigned char *data, int len)
{
      char tmp[80];
      int i, k;

      for (i = k = 0; len > 0; i++, len--) {
            if (i > 0 && (i % 16 == 0)) {
                  printk("%s\n", tmp);
                  k = 0;
            }
            k += sprintf(&tmp[k], "%02x ", data[i]);
      }
      if (k > 0)
            printk("%s\n", tmp);
}
#endif

/********************************
 * scratch ring buffer handling
 ********************************/
static int scratch_len(struct usb_usbvision *usbvision)    /*This returns the amount of data actually in the buffer */
{
      int len = usbvision->scratch_write_ptr - usbvision->scratch_read_ptr;
      if (len < 0) {
            len += scratch_buf_size;
      }
      PDEBUG(DBG_SCRATCH, "scratch_len() = %d\n", len);

      return len;
}


/* This returns the free space left in the buffer */
static int scratch_free(struct usb_usbvision *usbvision)
{
      int free = usbvision->scratch_read_ptr - usbvision->scratch_write_ptr;
      if (free <= 0) {
            free += scratch_buf_size;
      }
      if (free) {
            free -= 1;                                      /* at least one byte in the buffer must */
                                                            /* left blank, otherwise there is no chance to differ between full and empty */
      }
      PDEBUG(DBG_SCRATCH, "return %d\n", free);

      return free;
}


/* This puts data into the buffer */
static int scratch_put(struct usb_usbvision *usbvision, unsigned char *data,
                   int len)
{
      int len_part;

      if (usbvision->scratch_write_ptr + len < scratch_buf_size) {
            memcpy(usbvision->scratch + usbvision->scratch_write_ptr, data, len);
            usbvision->scratch_write_ptr += len;
      }
      else {
            len_part = scratch_buf_size - usbvision->scratch_write_ptr;
            memcpy(usbvision->scratch + usbvision->scratch_write_ptr, data, len_part);
            if (len == len_part) {
                  usbvision->scratch_write_ptr = 0;               /* just set write_ptr to zero */
            }
            else {
                  memcpy(usbvision->scratch, data + len_part, len - len_part);
                  usbvision->scratch_write_ptr = len - len_part;
            }
      }

      PDEBUG(DBG_SCRATCH, "len=%d, new write_ptr=%d\n", len, usbvision->scratch_write_ptr);

      return len;
}

/* This marks the write_ptr as position of new frame header */
static void scratch_mark_header(struct usb_usbvision *usbvision)
{
      PDEBUG(DBG_SCRATCH, "header at write_ptr=%d\n", usbvision->scratch_headermarker_write_ptr);

      usbvision->scratch_headermarker[usbvision->scratch_headermarker_write_ptr] =
                        usbvision->scratch_write_ptr;
      usbvision->scratch_headermarker_write_ptr += 1;
      usbvision->scratch_headermarker_write_ptr %= USBVISION_NUM_HEADERMARKER;
}

/* This gets data from the buffer at the given "ptr" position */
static int scratch_get_extra(struct usb_usbvision *usbvision,
                       unsigned char *data, int *ptr, int len)
{
      int len_part;
      if (*ptr + len < scratch_buf_size) {
            memcpy(data, usbvision->scratch + *ptr, len);
            *ptr += len;
      }
      else {
            len_part = scratch_buf_size - *ptr;
            memcpy(data, usbvision->scratch + *ptr, len_part);
            if (len == len_part) {
                  *ptr = 0;                                       /* just set the y_ptr to zero */
            }
            else {
                  memcpy(data + len_part, usbvision->scratch, len - len_part);
                  *ptr = len - len_part;
            }
      }

      PDEBUG(DBG_SCRATCH, "len=%d, new ptr=%d\n", len, *ptr);

      return len;
}


/* This sets the scratch extra read pointer */
static void scratch_set_extra_ptr(struct usb_usbvision *usbvision, int *ptr,
                          int len)
{
      *ptr = (usbvision->scratch_read_ptr + len)%scratch_buf_size;

      PDEBUG(DBG_SCRATCH, "ptr=%d\n", *ptr);
}


/*This increments the scratch extra read pointer */
static void scratch_inc_extra_ptr(int *ptr, int len)
{
      *ptr = (*ptr + len) % scratch_buf_size;

      PDEBUG(DBG_SCRATCH, "ptr=%d\n", *ptr);
}


/* This gets data from the buffer */
static int scratch_get(struct usb_usbvision *usbvision, unsigned char *data,
                   int len)
{
      int len_part;
      if (usbvision->scratch_read_ptr + len < scratch_buf_size) {
            memcpy(data, usbvision->scratch + usbvision->scratch_read_ptr, len);
            usbvision->scratch_read_ptr += len;
      }
      else {
            len_part = scratch_buf_size - usbvision->scratch_read_ptr;
            memcpy(data, usbvision->scratch + usbvision->scratch_read_ptr, len_part);
            if (len == len_part) {
                  usbvision->scratch_read_ptr = 0;                      /* just set the read_ptr to zero */
            }
            else {
                  memcpy(data + len_part, usbvision->scratch, len - len_part);
                  usbvision->scratch_read_ptr = len - len_part;
            }
      }

      PDEBUG(DBG_SCRATCH, "len=%d, new read_ptr=%d\n", len, usbvision->scratch_read_ptr);

      return len;
}


/* This sets read pointer to next header and returns it */
static int scratch_get_header(struct usb_usbvision *usbvision,
                        struct usbvision_frame_header *header)
{
      int errCode = 0;

      PDEBUG(DBG_SCRATCH, "from read_ptr=%d", usbvision->scratch_headermarker_read_ptr);

      while (usbvision->scratch_headermarker_write_ptr -
            usbvision->scratch_headermarker_read_ptr != 0) {
            usbvision->scratch_read_ptr =
                  usbvision->scratch_headermarker[usbvision->scratch_headermarker_read_ptr];
            usbvision->scratch_headermarker_read_ptr += 1;
            usbvision->scratch_headermarker_read_ptr %= USBVISION_NUM_HEADERMARKER;
            scratch_get(usbvision, (unsigned char *)header, USBVISION_HEADER_LENGTH);
            if ((header->magic_1 == USBVISION_MAGIC_1)
                   && (header->magic_2 == USBVISION_MAGIC_2)
                   && (header->headerLength == USBVISION_HEADER_LENGTH)) {
                  errCode = USBVISION_HEADER_LENGTH;
                  header->frameWidth  = header->frameWidthLo  + (header->frameWidthHi << 8);
                  header->frameHeight = header->frameHeightLo + (header->frameHeightHi << 8);
                  break;
            }
      }

      return errCode;
}


/*This removes len bytes of old data from the buffer */
static void scratch_rm_old(struct usb_usbvision *usbvision, int len)
{

      usbvision->scratch_read_ptr += len;
      usbvision->scratch_read_ptr %= scratch_buf_size;
      PDEBUG(DBG_SCRATCH, "read_ptr is now %d\n", usbvision->scratch_read_ptr);
}


/*This resets the buffer - kills all data in it too */
static void scratch_reset(struct usb_usbvision *usbvision)
{
      PDEBUG(DBG_SCRATCH, "\n");

      usbvision->scratch_read_ptr = 0;
      usbvision->scratch_write_ptr = 0;
      usbvision->scratch_headermarker_read_ptr = 0;
      usbvision->scratch_headermarker_write_ptr = 0;
      usbvision->isocstate = IsocState_NoFrame;
}

int usbvision_scratch_alloc(struct usb_usbvision *usbvision)
{
      usbvision->scratch = vmalloc_32(scratch_buf_size);
      scratch_reset(usbvision);
      if(usbvision->scratch == NULL) {
            dev_err(&usbvision->dev->dev,
                  "%s: unable to allocate %d bytes for scratch\n",
                        __func__, scratch_buf_size);
            return -ENOMEM;
      }
      return 0;
}

void usbvision_scratch_free(struct usb_usbvision *usbvision)
{
      vfree(usbvision->scratch);
      usbvision->scratch = NULL;

}

/*
 * usbvision_testpattern()
 *
 * Procedure forms a test pattern (yellow grid on blue background).
 *
 * Parameters:
 * fullframe:   if TRUE then entire frame is filled, otherwise the procedure
 *          continues from the current scanline.
 * pmode    0: fill the frame with solid blue color (like on VCR or TV)
 *          1: Draw a colored grid
 *
 */
static void usbvision_testpattern(struct usb_usbvision *usbvision,
                          int fullframe, int pmode)
{
      static const char proc[] = "usbvision_testpattern";
      struct usbvision_frame *frame;
      unsigned char *f;
      int num_cell = 0;
      int scan_length = 0;
      static int num_pass;

      if (usbvision == NULL) {
            printk(KERN_ERR "%s: usbvision == NULL\n", proc);
            return;
      }
      if (usbvision->curFrame == NULL) {
            printk(KERN_ERR "%s: usbvision->curFrame is NULL.\n", proc);
            return;
      }

      /* Grab the current frame */
      frame = usbvision->curFrame;

      /* Optionally start at the beginning */
      if (fullframe) {
            frame->curline = 0;
            frame->scanlength = 0;
      }

      /* Form every scan line */
      for (; frame->curline < frame->frmheight; frame->curline++) {
            int i;

            f = frame->data + (usbvision->curwidth * 3 * frame->curline);
            for (i = 0; i < usbvision->curwidth; i++) {
                  unsigned char cb = 0x80;
                  unsigned char cg = 0;
                  unsigned char cr = 0;

                  if (pmode == 1) {
                        if (frame->curline % 32 == 0)
                              cb = 0, cg = cr = 0xFF;
                        else if (i % 32 == 0) {
                              if (frame->curline % 32 == 1)
                                    num_cell++;
                              cb = 0, cg = cr = 0xFF;
                        } else {
                              cb =
                                  ((num_cell * 7) +
                                   num_pass) & 0xFF;
                              cg =
                                  ((num_cell * 5) +
                                   num_pass * 2) & 0xFF;
                              cr =
                                  ((num_cell * 3) +
                                   num_pass * 3) & 0xFF;
                        }
                  } else {
                        /* Just the blue screen */
                  }

                  *f++ = cb;
                  *f++ = cg;
                  *f++ = cr;
                  scan_length += 3;
            }
      }

      frame->grabstate = FrameState_Done;
      frame->scanlength += scan_length;
      ++num_pass;

}

/*
 * usbvision_decompress_alloc()
 *
 * allocates intermediate buffer for decompression
 */
int usbvision_decompress_alloc(struct usb_usbvision *usbvision)
{
      int IFB_size = MAX_FRAME_WIDTH * MAX_FRAME_HEIGHT * 3 / 2;
      usbvision->IntraFrameBuffer = vmalloc_32(IFB_size);
      if (usbvision->IntraFrameBuffer == NULL) {
            dev_err(&usbvision->dev->dev,
                  "%s: unable to allocate %d for compr. frame buffer\n",
                        __func__, IFB_size);
            return -ENOMEM;
      }
      return 0;
}

/*
 * usbvision_decompress_free()
 *
 * frees intermediate buffer for decompression
 */
void usbvision_decompress_free(struct usb_usbvision *usbvision)
{
      vfree(usbvision->IntraFrameBuffer);
      usbvision->IntraFrameBuffer = NULL;

}

/************************************************************
 * Here comes the data parsing stuff that is run as interrupt
 ************************************************************/
/*
 * usbvision_find_header()
 *
 * Locate one of supported header markers in the scratch buffer.
 */
static enum ParseState usbvision_find_header(struct usb_usbvision *usbvision)
{
      struct usbvision_frame *frame;
      int foundHeader = 0;

      frame = usbvision->curFrame;

      while (scratch_get_header(usbvision, &frame->isocHeader) == USBVISION_HEADER_LENGTH) {
            // found header in scratch
            PDEBUG(DBG_HEADER, "found header: 0x%02x%02x %d %d %d %d %#x 0x%02x %u %u",
                        frame->isocHeader.magic_2,
                        frame->isocHeader.magic_1,
                        frame->isocHeader.headerLength,
                        frame->isocHeader.frameNum,
                        frame->isocHeader.framePhase,
                        frame->isocHeader.frameLatency,
                        frame->isocHeader.dataFormat,
                        frame->isocHeader.formatParam,
                        frame->isocHeader.frameWidth,
                        frame->isocHeader.frameHeight);

            if (usbvision->requestIntra) {
                  if (frame->isocHeader.formatParam & 0x80) {
                        foundHeader = 1;
                        usbvision->lastIsocFrameNum = -1; // do not check for lost frames this time
                        usbvision_unrequest_intra(usbvision);
                        break;
                  }
            }
            else {
                  foundHeader = 1;
                  break;
            }
      }

      if (foundHeader) {
            frame->frmwidth = frame->isocHeader.frameWidth * usbvision->stretch_width;
            frame->frmheight = frame->isocHeader.frameHeight * usbvision->stretch_height;
            frame->v4l2_linesize = (frame->frmwidth * frame->v4l2_format.depth)>> 3;
      }
      else { // no header found
            PDEBUG(DBG_HEADER, "skipping scratch data, no header");
            scratch_reset(usbvision);
            return ParseState_EndParse;
      }

      // found header
      if (frame->isocHeader.dataFormat==ISOC_MODE_COMPRESS) {
            //check isocHeader.frameNum for lost frames
            if (usbvision->lastIsocFrameNum >= 0) {
                  if (((usbvision->lastIsocFrameNum + 1) % 32) != frame->isocHeader.frameNum) {
                        // unexpected frame drop: need to request new intra frame
                        PDEBUG(DBG_HEADER, "Lost frame before %d on USB", frame->isocHeader.frameNum);
                        usbvision_request_intra(usbvision);
                        return ParseState_NextFrame;
                  }
            }
            usbvision->lastIsocFrameNum = frame->isocHeader.frameNum;
      }
      usbvision->header_count++;
      frame->scanstate = ScanState_Lines;
      frame->curline = 0;

      if (force_testpattern) {
            usbvision_testpattern(usbvision, 1, 1);
            return ParseState_NextFrame;
      }
      return ParseState_Continue;
}

static enum ParseState usbvision_parse_lines_422(struct usb_usbvision *usbvision,
                                 long *pcopylen)
{
      volatile struct usbvision_frame *frame;
      unsigned char *f;
      int len;
      int i;
      unsigned char yuyv[4]={180, 128, 10, 128}; // YUV components
      unsigned char rv, gv, bv;     // RGB components
      int clipmask_index, bytes_per_pixel;
      int stretch_bytes, clipmask_add;

      frame  = usbvision->curFrame;
      f = frame->data + (frame->v4l2_linesize * frame->curline);

      /* Make sure there's enough data for the entire line */
      len = (frame->isocHeader.frameWidth * 2)+5;
      if (scratch_len(usbvision) < len) {
            PDEBUG(DBG_PARSE, "out of data in line %d, need %u.\n", frame->curline, len);
            return ParseState_Out;
      }

      if ((frame->curline + 1) >= frame->frmheight) {
            return ParseState_NextFrame;
      }

      bytes_per_pixel = frame->v4l2_format.bytes_per_pixel;
      stretch_bytes = (usbvision->stretch_width - 1) * bytes_per_pixel;
      clipmask_index = frame->curline * MAX_FRAME_WIDTH;
      clipmask_add = usbvision->stretch_width;

      for (i = 0; i < frame->frmwidth; i+=(2 * usbvision->stretch_width)) {

            scratch_get(usbvision, &yuyv[0], 4);

            if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
                  *f++ = yuyv[0]; // Y
                  *f++ = yuyv[3]; // U
            }
            else {

                  YUV_TO_RGB_BY_THE_BOOK(yuyv[0], yuyv[1], yuyv[3], rv, gv, bv);
                  switch (frame->v4l2_format.format) {
                  case V4L2_PIX_FMT_RGB565:
                        *f++ = (0x1F & rv) |
                              (0xE0 & (gv << 5));
                        *f++ = (0x07 & (gv >> 3)) |
                              (0xF8 &  bv);
                        break;
                  case V4L2_PIX_FMT_RGB24:
                        *f++ = rv;
                        *f++ = gv;
                        *f++ = bv;
                        break;
                  case V4L2_PIX_FMT_RGB32:
                        *f++ = rv;
                        *f++ = gv;
                        *f++ = bv;
                        f++;
                        break;
                  case V4L2_PIX_FMT_RGB555:
                        *f++ = (0x1F & rv) |
                              (0xE0 & (gv << 5));
                        *f++ = (0x03 & (gv >> 3)) |
                              (0x7C & (bv << 2));
                        break;
                  }
            }
            clipmask_index += clipmask_add;
            f += stretch_bytes;

            if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
                  *f++ = yuyv[2]; // Y
                  *f++ = yuyv[1]; // V
            }
            else {

                  YUV_TO_RGB_BY_THE_BOOK(yuyv[2], yuyv[1], yuyv[3], rv, gv, bv);
                  switch (frame->v4l2_format.format) {
                  case V4L2_PIX_FMT_RGB565:
                        *f++ = (0x1F & rv) |
                              (0xE0 & (gv << 5));
                        *f++ = (0x07 & (gv >> 3)) |
                              (0xF8 &  bv);
                        break;
                  case V4L2_PIX_FMT_RGB24:
                        *f++ = rv;
                        *f++ = gv;
                        *f++ = bv;
                        break;
                  case V4L2_PIX_FMT_RGB32:
                        *f++ = rv;
                        *f++ = gv;
                        *f++ = bv;
                        f++;
                        break;
                  case V4L2_PIX_FMT_RGB555:
                        *f++ = (0x1F & rv) |
                              (0xE0 & (gv << 5));
                        *f++ = (0x03 & (gv >> 3)) |
                              (0x7C & (bv << 2));
                        break;
                  }
            }
            clipmask_index += clipmask_add;
            f += stretch_bytes;
      }

      frame->curline += usbvision->stretch_height;
      *pcopylen += frame->v4l2_linesize * usbvision->stretch_height;

      if (frame->curline >= frame->frmheight) {
            return ParseState_NextFrame;
      }
      else {
            return ParseState_Continue;
      }
}

/* The decompression routine  */
static int usbvision_decompress(struct usb_usbvision *usbvision,unsigned char *Compressed,
                                                unsigned char *Decompressed, int *StartPos,
                                                int *BlockTypeStartPos, int Len)
{
      int RestPixel, Idx, MaxPos, Pos, ExtraPos, BlockLen, BlockTypePos, BlockTypeLen;
      unsigned char BlockByte, BlockCode, BlockType, BlockTypeByte, Integrator;

      Integrator = 0;
      Pos = *StartPos;
      BlockTypePos = *BlockTypeStartPos;
      MaxPos = 396; //Pos + Len;
      ExtraPos = Pos;
      BlockLen = 0;
      BlockByte = 0;
      BlockCode = 0;
      BlockType = 0;
      BlockTypeByte = 0;
      BlockTypeLen = 0;
      RestPixel = Len;

      for (Idx = 0; Idx < Len; Idx++) {

            if (BlockLen == 0) {
                  if (BlockTypeLen==0) {
                        BlockTypeByte = Compressed[BlockTypePos];
                        BlockTypePos++;
                        BlockTypeLen = 4;
                  }
                  BlockType = (BlockTypeByte & 0xC0) >> 6;

                  //statistic:
                  usbvision->ComprBlockTypes[BlockType]++;

                  Pos = ExtraPos;
                  if (BlockType == 0) {
                        if(RestPixel >= 24) {
                              Idx += 23;
                              RestPixel -= 24;
                              Integrator = Decompressed[Idx];
                        } else {
                              Idx += RestPixel - 1;
                              RestPixel = 0;
                        }
                  } else {
                        BlockCode = Compressed[Pos];
                        Pos++;
                        if (RestPixel >= 24) {
                              BlockLen  = 24;
                        } else {
                              BlockLen = RestPixel;
                        }
                        RestPixel -= BlockLen;
                        ExtraPos = Pos + (BlockLen / 4);
                  }
                  BlockTypeByte <<= 2;
                  BlockTypeLen -= 1;
            }
            if (BlockLen > 0) {
                  if ((BlockLen%4) == 0) {
                        BlockByte = Compressed[Pos];
                        Pos++;
                  }
                  if (BlockType == 1) { //inter Block
                        Integrator = Decompressed[Idx];
                  }
                  switch (BlockByte & 0xC0) {
                        case 0x03<<6:
                              Integrator += Compressed[ExtraPos];
                              ExtraPos++;
                              break;
                        case 0x02<<6:
                              Integrator += BlockCode;
                              break;
                        case 0x00:
                              Integrator -= BlockCode;
                              break;
                  }
                  Decompressed[Idx] = Integrator;
                  BlockByte <<= 2;
                  BlockLen -= 1;
            }
      }
      *StartPos = ExtraPos;
      *BlockTypeStartPos = BlockTypePos;
      return Idx;
}


/*
 * usbvision_parse_compress()
 *
 * Parse compressed frame from the scratch buffer, put
 * decoded RGB value into the current frame buffer and add the written
 * number of bytes (RGB) to the *pcopylen.
 *
 */
static enum ParseState usbvision_parse_compress(struct usb_usbvision *usbvision,
                                 long *pcopylen)
{
#define USBVISION_STRIP_MAGIC       0x5A
#define USBVISION_STRIP_LEN_MAX           400
#define USBVISION_STRIP_HEADER_LEN  3

      struct usbvision_frame *frame;
      unsigned char *f,*u = NULL ,*v = NULL;
      unsigned char StripData[USBVISION_STRIP_LEN_MAX];
      unsigned char StripHeader[USBVISION_STRIP_HEADER_LEN];
      int Idx, IdxEnd, StripLen, StripPtr, StartBlockPos, BlockPos, BlockTypePos;
      int clipmask_index, bytes_per_pixel, rc;
      int imageSize;
      unsigned char rv, gv, bv;
      static unsigned char *Y, *U, *V;

      frame  = usbvision->curFrame;
      imageSize = frame->frmwidth * frame->frmheight;
      if ( (frame->v4l2_format.format == V4L2_PIX_FMT_YUV422P) ||
           (frame->v4l2_format.format == V4L2_PIX_FMT_YVU420) ) {       // this is a planar format
            //... v4l2_linesize not used here.
            f = frame->data + (frame->width * frame->curline);
      } else
            f = frame->data + (frame->v4l2_linesize * frame->curline);

      if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV){ //initialise u and v pointers
            // get base of u and b planes add halfoffset

            u = frame->data
                  + imageSize
                  + (frame->frmwidth >>1) * frame->curline ;
            v = u + (imageSize >>1 );

      } else if (frame->v4l2_format.format == V4L2_PIX_FMT_YVU420){

            v = frame->data + imageSize + ((frame->curline* (frame->width))>>2) ;
            u = v + (imageSize >>2) ;
      }

      if (frame->curline == 0) {
            usbvision_adjust_compression(usbvision);
      }

      if (scratch_len(usbvision) < USBVISION_STRIP_HEADER_LEN) {
            return ParseState_Out;
      }

      //get strip header without changing the scratch_read_ptr
      scratch_set_extra_ptr(usbvision, &StripPtr, 0);
      scratch_get_extra(usbvision, &StripHeader[0], &StripPtr,
                        USBVISION_STRIP_HEADER_LEN);

      if (StripHeader[0] != USBVISION_STRIP_MAGIC) {
            // wrong strip magic
            usbvision->stripMagicErrors++;
            return ParseState_NextFrame;
      }

      if (frame->curline != (int)StripHeader[2]) {
            //line number missmatch error
            usbvision->stripLineNumberErrors++;
      }

      StripLen = 2 * (unsigned int)StripHeader[1];
      if (StripLen > USBVISION_STRIP_LEN_MAX) {
            // strip overrun
            // I think this never happens
            usbvision_request_intra(usbvision);
      }

      if (scratch_len(usbvision) < StripLen) {
            //there is not enough data for the strip
            return ParseState_Out;
      }

      if (usbvision->IntraFrameBuffer) {
            Y = usbvision->IntraFrameBuffer + frame->frmwidth * frame->curline;
            U = usbvision->IntraFrameBuffer + imageSize + (frame->frmwidth / 2) * (frame->curline / 2);
            V = usbvision->IntraFrameBuffer + imageSize / 4 * 5 + (frame->frmwidth / 2) * (frame->curline / 2);
      }
      else {
            return ParseState_NextFrame;
      }

      bytes_per_pixel = frame->v4l2_format.bytes_per_pixel;
      clipmask_index = frame->curline * MAX_FRAME_WIDTH;

      scratch_get(usbvision, StripData, StripLen);

      IdxEnd = frame->frmwidth;
      BlockTypePos = USBVISION_STRIP_HEADER_LEN;
      StartBlockPos = BlockTypePos + (IdxEnd - 1) / 96 + (IdxEnd / 2 - 1) / 96 + 2;
      BlockPos = StartBlockPos;

      usbvision->BlockPos = BlockPos;

      if ((rc = usbvision_decompress(usbvision, StripData, Y, &BlockPos, &BlockTypePos, IdxEnd)) != IdxEnd) {
            //return ParseState_Continue;
      }
      if (StripLen > usbvision->maxStripLen) {
            usbvision->maxStripLen = StripLen;
      }

      if (frame->curline%2) {
            if ((rc = usbvision_decompress(usbvision, StripData, V, &BlockPos, &BlockTypePos, IdxEnd/2)) != IdxEnd/2) {
            //return ParseState_Continue;
            }
      }
      else {
            if ((rc = usbvision_decompress(usbvision, StripData, U, &BlockPos, &BlockTypePos, IdxEnd/2)) != IdxEnd/2) {
                  //return ParseState_Continue;
            }
      }

      if (BlockPos > usbvision->comprBlockPos) {
            usbvision->comprBlockPos = BlockPos;
      }
      if (BlockPos > StripLen) {
            usbvision->stripLenErrors++;
      }

      for (Idx = 0; Idx < IdxEnd; Idx++) {
            if(frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
                  *f++ = Y[Idx];
                  *f++ = Idx & 0x01 ? U[Idx/2] : V[Idx/2];
            }
            else if(frame->v4l2_format.format == V4L2_PIX_FMT_YUV422P) {
                  *f++ = Y[Idx];
                  if ( Idx & 0x01)
                        *u++ = U[Idx>>1] ;
                  else
                        *v++ = V[Idx>>1];
            }
            else if (frame->v4l2_format.format == V4L2_PIX_FMT_YVU420) {
                  *f++ = Y [Idx];
                  if ( !((  Idx & 0x01  ) | (  frame->curline & 0x01  )) ){

/*                       only need do this for 1 in 4 pixels */
/*                       intraframe buffer is YUV420 format */

                        *u++ = U[Idx >>1];
                        *v++ = V[Idx >>1];
                  }

            }
            else {
                  YUV_TO_RGB_BY_THE_BOOK(Y[Idx], U[Idx/2], V[Idx/2], rv, gv, bv);
                  switch (frame->v4l2_format.format) {
                        case V4L2_PIX_FMT_GREY:
                              *f++ = Y[Idx];
                              break;
                        case V4L2_PIX_FMT_RGB555:
                              *f++ = (0x1F & rv) |
                                    (0xE0 & (gv << 5));
                              *f++ = (0x03 & (gv >> 3)) |
                                    (0x7C & (bv << 2));
                              break;
                        case V4L2_PIX_FMT_RGB565:
                              *f++ = (0x1F & rv) |
                                    (0xE0 & (gv << 5));
                              *f++ = (0x07 & (gv >> 3)) |
                                    (0xF8 &  bv);
                              break;
                        case V4L2_PIX_FMT_RGB24:
                              *f++ = rv;
                              *f++ = gv;
                              *f++ = bv;
                              break;
                        case V4L2_PIX_FMT_RGB32:
                              *f++ = rv;
                              *f++ = gv;
                              *f++ = bv;
                              f++;
                              break;
                  }
            }
            clipmask_index++;
      }
      /* Deal with non-integer no. of bytes for YUV420P */
      if (frame->v4l2_format.format != V4L2_PIX_FMT_YVU420 )
            *pcopylen += frame->v4l2_linesize;
      else
            *pcopylen += frame->curline & 0x01 ? frame->v4l2_linesize : frame->v4l2_linesize << 1;

      frame->curline += 1;

      if (frame->curline >= frame->frmheight) {
            return ParseState_NextFrame;
      }
      else {
            return ParseState_Continue;
      }

}


/*
 * usbvision_parse_lines_420()
 *
 * Parse two lines from the scratch buffer, put
 * decoded RGB value into the current frame buffer and add the written
 * number of bytes (RGB) to the *pcopylen.
 *
 */
static enum ParseState usbvision_parse_lines_420(struct usb_usbvision *usbvision,
                                 long *pcopylen)
{
      struct usbvision_frame *frame;
      unsigned char *f_even = NULL, *f_odd = NULL;
      unsigned int pixel_per_line, block;
      int pixel, block_split;
      int y_ptr, u_ptr, v_ptr, y_odd_offset;
      const int   y_block_size = 128;
      const int  uv_block_size = 64;
      const int sub_block_size = 32;
      const int y_step[] = { 0, 0, 0, 2 },  y_step_size = 4;
      const int uv_step[]= { 0, 0, 0, 4 }, uv_step_size = 4;
      unsigned char y[2], u, v;     /* YUV components */
      int y_, u_, v_, vb, uvg, ur;
      int r_, g_, b_;               /* RGB components */
      unsigned char g;
      int clipmask_even_index, clipmask_odd_index, bytes_per_pixel;
      int clipmask_add, stretch_bytes;

      frame  = usbvision->curFrame;
      f_even = frame->data + (frame->v4l2_linesize * frame->curline);
      f_odd  = f_even + frame->v4l2_linesize * usbvision->stretch_height;

      /* Make sure there's enough data for the entire line */
      /* In this mode usbvision transfer 3 bytes for every 2 pixels */
      /* I need two lines to decode the color */
      bytes_per_pixel = frame->v4l2_format.bytes_per_pixel;
      stretch_bytes = (usbvision->stretch_width - 1) * bytes_per_pixel;
      clipmask_even_index = frame->curline * MAX_FRAME_WIDTH;
      clipmask_odd_index  = clipmask_even_index + MAX_FRAME_WIDTH;
      clipmask_add = usbvision->stretch_width;
      pixel_per_line = frame->isocHeader.frameWidth;

      if (scratch_len(usbvision) < (int)pixel_per_line * 3) {
            //printk(KERN_DEBUG "out of data, need %d\n", len);
            return ParseState_Out;
      }

      if ((frame->curline + 1) >= frame->frmheight) {
            return ParseState_NextFrame;
      }

      block_split = (pixel_per_line%y_block_size) ? 1 : 0;  //are some blocks splitted into different lines?

      y_odd_offset = (pixel_per_line / y_block_size) * (y_block_size + uv_block_size)
                  + block_split * uv_block_size;

      scratch_set_extra_ptr(usbvision, &y_ptr, y_odd_offset);
      scratch_set_extra_ptr(usbvision, &u_ptr, y_block_size);
      scratch_set_extra_ptr(usbvision, &v_ptr, y_odd_offset
                  + (4 - block_split) * sub_block_size);

      for (block = 0; block < (pixel_per_line / sub_block_size);
           block++) {


            for (pixel = 0; pixel < sub_block_size; pixel +=2) {
                  scratch_get(usbvision, &y[0], 2);
                  scratch_get_extra(usbvision, &u, &u_ptr, 1);
                  scratch_get_extra(usbvision, &v, &v_ptr, 1);

                  //I don't use the YUV_TO_RGB macro for better performance
                  v_ = v - 128;
                  u_ = u - 128;
                  vb =              132252 * v_;
                  uvg= -53281 * u_ - 25625 * v_;
                  ur = 104595 * u_;

                  if(frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
                        *f_even++ = y[0];
                        *f_even++ = v;
                  }
                  else {
                        y_ = 76284 * (y[0] - 16);

                        b_ = (y_ + vb) >> 16;
                        g_ = (y_ + uvg)>> 16;
                        r_ = (y_ + ur) >> 16;

                        switch (frame->v4l2_format.format) {
                        case V4L2_PIX_FMT_RGB565:
                              g = LIMIT_RGB(g_);
                              *f_even++ =
                                    (0x1F & LIMIT_RGB(r_)) |
                                    (0xE0 & (g << 5));
                              *f_even++ =
                                    (0x07 & (g >> 3)) |
                                    (0xF8 &  LIMIT_RGB(b_));
                              break;
                        case V4L2_PIX_FMT_RGB24:
                              *f_even++ = LIMIT_RGB(r_);
                              *f_even++ = LIMIT_RGB(g_);
                              *f_even++ = LIMIT_RGB(b_);
                              break;
                        case V4L2_PIX_FMT_RGB32:
                              *f_even++ = LIMIT_RGB(r_);
                              *f_even++ = LIMIT_RGB(g_);
                              *f_even++ = LIMIT_RGB(b_);
                              f_even++;
                              break;
                        case V4L2_PIX_FMT_RGB555:
                              g = LIMIT_RGB(g_);
                              *f_even++ = (0x1F & LIMIT_RGB(r_)) |
                                    (0xE0 & (g << 5));
                              *f_even++ = (0x03 & (g >> 3)) |
                                    (0x7C & (LIMIT_RGB(b_) << 2));
                              break;
                        }
                  }
                  clipmask_even_index += clipmask_add;
                  f_even += stretch_bytes;

                  if(frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
                        *f_even++ = y[1];
                        *f_even++ = u;
                  }
                  else {
                        y_ = 76284 * (y[1] - 16);

                        b_ = (y_ + vb) >> 16;
                        g_ = (y_ + uvg)>> 16;
                        r_ = (y_ + ur) >> 16;

                        switch (frame->v4l2_format.format) {
                        case V4L2_PIX_FMT_RGB565:
                              g = LIMIT_RGB(g_);
                              *f_even++ =
                                    (0x1F & LIMIT_RGB(r_)) |
                                    (0xE0 & (g << 5));
                              *f_even++ =
                                    (0x07 & (g >> 3)) |
                                    (0xF8 &  LIMIT_RGB(b_));
                              break;
                        case V4L2_PIX_FMT_RGB24:
                              *f_even++ = LIMIT_RGB(r_);
                              *f_even++ = LIMIT_RGB(g_);
                              *f_even++ = LIMIT_RGB(b_);
                              break;
                        case V4L2_PIX_FMT_RGB32:
                              *f_even++ = LIMIT_RGB(r_);
                              *f_even++ = LIMIT_RGB(g_);
                              *f_even++ = LIMIT_RGB(b_);
                              f_even++;
                              break;
                        case V4L2_PIX_FMT_RGB555:
                              g = LIMIT_RGB(g_);
                              *f_even++ = (0x1F & LIMIT_RGB(r_)) |
                                    (0xE0 & (g << 5));
                              *f_even++ = (0x03 & (g >> 3)) |
                                    (0x7C & (LIMIT_RGB(b_) << 2));
                              break;
                        }
                  }
                  clipmask_even_index += clipmask_add;
                  f_even += stretch_bytes;

                  scratch_get_extra(usbvision, &y[0], &y_ptr, 2);

                  if(frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
                        *f_odd++ = y[0];
                        *f_odd++ = v;
                  }
                  else {
                        y_ = 76284 * (y[0] - 16);

                        b_ = (y_ + vb) >> 16;
                        g_ = (y_ + uvg)>> 16;
                        r_ = (y_ + ur) >> 16;

                        switch (frame->v4l2_format.format) {
                        case V4L2_PIX_FMT_RGB565:
                              g = LIMIT_RGB(g_);
                              *f_odd++ =
                                    (0x1F & LIMIT_RGB(r_)) |
                                    (0xE0 & (g << 5));
                              *f_odd++ =
                                    (0x07 & (g >> 3)) |
                                    (0xF8 &  LIMIT_RGB(b_));
                              break;
                        case V4L2_PIX_FMT_RGB24:
                              *f_odd++ = LIMIT_RGB(r_);
                              *f_odd++ = LIMIT_RGB(g_);
                              *f_odd++ = LIMIT_RGB(b_);
                              break;
                        case V4L2_PIX_FMT_RGB32:
                              *f_odd++ = LIMIT_RGB(r_);
                              *f_odd++ = LIMIT_RGB(g_);
                              *f_odd++ = LIMIT_RGB(b_);
                              f_odd++;
                              break;
                        case V4L2_PIX_FMT_RGB555:
                              g = LIMIT_RGB(g_);
                              *f_odd++ = (0x1F & LIMIT_RGB(r_)) |
                                    (0xE0 & (g << 5));
                              *f_odd++ = (0x03 & (g >> 3)) |
                                    (0x7C & (LIMIT_RGB(b_) << 2));
                              break;
                        }
                  }
                  clipmask_odd_index += clipmask_add;
                  f_odd += stretch_bytes;

                  if(frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
                        *f_odd++ = y[1];
                        *f_odd++ = u;
                  }
                  else {
                        y_ = 76284 * (y[1] - 16);

                        b_ = (y_ + vb) >> 16;
                        g_ = (y_ + uvg)>> 16;
                        r_ = (y_ + ur) >> 16;

                        switch (frame->v4l2_format.format) {
                        case V4L2_PIX_FMT_RGB565:
                              g = LIMIT_RGB(g_);
                              *f_odd++ =
                                    (0x1F & LIMIT_RGB(r_)) |
                                    (0xE0 & (g << 5));
                              *f_odd++ =
                                    (0x07 & (g >> 3)) |
                                    (0xF8 &  LIMIT_RGB(b_));
                              break;
                        case V4L2_PIX_FMT_RGB24:
                              *f_odd++ = LIMIT_RGB(r_);
                              *f_odd++ = LIMIT_RGB(g_);
                              *f_odd++ = LIMIT_RGB(b_);
                              break;
                        case V4L2_PIX_FMT_RGB32:
                              *f_odd++ = LIMIT_RGB(r_);
                              *f_odd++ = LIMIT_RGB(g_);
                              *f_odd++ = LIMIT_RGB(b_);
                              f_odd++;
                              break;
                        case V4L2_PIX_FMT_RGB555:
                              g = LIMIT_RGB(g_);
                              *f_odd++ = (0x1F & LIMIT_RGB(r_)) |
                                    (0xE0 & (g << 5));
                              *f_odd++ = (0x03 & (g >> 3)) |
                                    (0x7C & (LIMIT_RGB(b_) << 2));
                              break;
                        }
                  }
                  clipmask_odd_index += clipmask_add;
                  f_odd += stretch_bytes;
            }

            scratch_rm_old(usbvision,y_step[block % y_step_size] * sub_block_size);
            scratch_inc_extra_ptr(&y_ptr, y_step[(block + 2 * block_split) % y_step_size]
                        * sub_block_size);
            scratch_inc_extra_ptr(&u_ptr, uv_step[block % uv_step_size]
                        * sub_block_size);
            scratch_inc_extra_ptr(&v_ptr, uv_step[(block + 2 * block_split) % uv_step_size]
                        * sub_block_size);
      }

      scratch_rm_old(usbvision, pixel_per_line * 3 / 2
                  + block_split * sub_block_size);

      frame->curline += 2 * usbvision->stretch_height;
      *pcopylen += frame->v4l2_linesize * 2 * usbvision->stretch_height;

      if (frame->curline >= frame->frmheight)
            return ParseState_NextFrame;
      else
            return ParseState_Continue;
}

/*
 * usbvision_parse_data()
 *
 * Generic routine to parse the scratch buffer. It employs either
 * usbvision_find_header() or usbvision_parse_lines() to do most
 * of work.
 *
 */
static void usbvision_parse_data(struct usb_usbvision *usbvision)
{
      struct usbvision_frame *frame;
      enum ParseState newstate;
      long copylen = 0;
      unsigned long lock_flags;

      frame = usbvision->curFrame;

      PDEBUG(DBG_PARSE, "parsing len=%d\n", scratch_len(usbvision));

      while (1) {

            newstate = ParseState_Out;
            if (scratch_len(usbvision)) {
                  if (frame->scanstate == ScanState_Scanning) {
                        newstate = usbvision_find_header(usbvision);
                  }
                  else if (frame->scanstate == ScanState_Lines) {
                        if (usbvision->isocMode == ISOC_MODE_YUV420) {
                              newstate = usbvision_parse_lines_420(usbvision, &copylen);
                        }
                        else if (usbvision->isocMode == ISOC_MODE_YUV422) {
                              newstate = usbvision_parse_lines_422(usbvision, &copylen);
                        }
                        else if (usbvision->isocMode == ISOC_MODE_COMPRESS) {
                              newstate = usbvision_parse_compress(usbvision, &copylen);
                        }

                  }
            }
            if (newstate == ParseState_Continue) {
                  continue;
            }
            else if ((newstate == ParseState_NextFrame) || (newstate == ParseState_Out)) {
                  break;
            }
            else {
                  return;     /* ParseState_EndParse */
            }
      }

      if (newstate == ParseState_NextFrame) {
            frame->grabstate = FrameState_Done;
            do_gettimeofday(&(frame->timestamp));
            frame->sequence = usbvision->frame_num;

            spin_lock_irqsave(&usbvision->queue_lock, lock_flags);
            list_move_tail(&(frame->frame), &usbvision->outqueue);
            usbvision->curFrame = NULL;
            spin_unlock_irqrestore(&usbvision->queue_lock, lock_flags);

            usbvision->frame_num++;

            /* This will cause the process to request another frame. */
            if (waitqueue_active(&usbvision->wait_frame)) {
                  PDEBUG(DBG_PARSE, "Wake up !");
                  wake_up_interruptible(&usbvision->wait_frame);
            }
      }
      else
            frame->grabstate = FrameState_Grabbing;


      /* Update the frame's uncompressed length. */
      frame->scanlength += copylen;
}


/*
 * Make all of the blocks of data contiguous
 */
static int usbvision_compress_isochronous(struct usb_usbvision *usbvision,
                                struct urb *urb)
{
      unsigned char *packet_data;
      int i, totlen = 0;

      for (i = 0; i < urb->number_of_packets; i++) {
            int packet_len = urb->iso_frame_desc[i].actual_length;
            int packet_stat = urb->iso_frame_desc[i].status;

            packet_data = urb->transfer_buffer + urb->iso_frame_desc[i].offset;

            /* Detect and ignore errored packets */
            if (packet_stat) {      // packet_stat != 0 ?????????????
                  PDEBUG(DBG_ISOC, "data error: [%d] len=%d, status=%X", i, packet_len, packet_stat);
                  usbvision->isocErrCount++;
                  continue;
            }

            /* Detect and ignore empty packets */
            if (packet_len < 0) {
                  PDEBUG(DBG_ISOC, "error packet [%d]", i);
                  usbvision->isocSkipCount++;
                  continue;
            }
            else if (packet_len == 0) {   /* Frame end ????? */
                  PDEBUG(DBG_ISOC, "null packet [%d]", i);
                  usbvision->isocstate=IsocState_NoFrame;
                  usbvision->isocSkipCount++;
                  continue;
            }
            else if (packet_len > usbvision->isocPacketSize) {
                  PDEBUG(DBG_ISOC, "packet[%d] > isocPacketSize", i);
                  usbvision->isocSkipCount++;
                  continue;
            }

            PDEBUG(DBG_ISOC, "packet ok [%d] len=%d", i, packet_len);

            if (usbvision->isocstate==IsocState_NoFrame) { //new frame begins
                  usbvision->isocstate=IsocState_InFrame;
                  scratch_mark_header(usbvision);
                  usbvision_measure_bandwidth(usbvision);
                  PDEBUG(DBG_ISOC, "packet with header");
            }

            /*
             * If usbvision continues to feed us with data but there is no
             * consumption (if, for example, V4L client fell asleep) we
             * may overflow the buffer. We have to move old data over to
             * free room for new data. This is bad for old data. If we
             * just drop new data then it's bad for new data... choose
             * your favorite evil here.
             */
            if (scratch_free(usbvision) < packet_len) {

                  usbvision->scratch_ovf_count++;
                  PDEBUG(DBG_ISOC, "scratch buf overflow! scr_len: %d, n: %d",
                         scratch_len(usbvision), packet_len);
                  scratch_rm_old(usbvision, packet_len - scratch_free(usbvision));
            }

            /* Now we know that there is enough room in scratch buffer */
            scratch_put(usbvision, packet_data, packet_len);
            totlen += packet_len;
            usbvision->isocDataCount += packet_len;
            usbvision->isocPacketCount++;
      }
#if ENABLE_HEXDUMP
      if (totlen > 0) {
            static int foo;
            if (foo < 1) {
                  printk(KERN_DEBUG "+%d.\n", usbvision->scratchlen);
                  usbvision_hexdump(data0, (totlen > 64) ? 64 : totlen);
                  ++foo;
            }
      }
#endif
 return totlen;
}

static void usbvision_isocIrq(struct urb *urb)
{
      int errCode = 0;
      int len;
      struct usb_usbvision *usbvision = urb->context;
      int i;
      unsigned long startTime = jiffies;
      struct usbvision_frame **f;

      /* We don't want to do anything if we are about to be removed! */
      if (!USBVISION_IS_OPERATIONAL(usbvision))
            return;

      /* any urb with wrong status is ignored without acknowledgement */
      if (urb->status == -ENOENT) {
            return;
      }

      f = &usbvision->curFrame;

      /* Manage streaming interruption */
      if (usbvision->streaming == Stream_Interrupt) {
            usbvision->streaming = Stream_Idle;
            if ((*f)) {
                  (*f)->grabstate = FrameState_Ready;
                  (*f)->scanstate = ScanState_Scanning;
            }
            PDEBUG(DBG_IRQ, "stream interrupted");
            wake_up_interruptible(&usbvision->wait_stream);
      }

      /* Copy the data received into our scratch buffer */
      len = usbvision_compress_isochronous(usbvision, urb);

      usbvision->isocUrbCount++;
      usbvision->urb_length = len;

      if (usbvision->streaming == Stream_On) {

            /* If we collected enough data let's parse! */
            if ((scratch_len(usbvision) > USBVISION_HEADER_LENGTH) &&
                (!list_empty(&(usbvision->inqueue))) ) {
                  if (!(*f)) {
                        (*f) = list_entry(usbvision->inqueue.next,
                                      struct usbvision_frame,
                                      frame);
                  }
                  usbvision_parse_data(usbvision);
            }
            else {
                  /*If we don't have a frame
                    we're current working on, complain */
                  PDEBUG(DBG_IRQ,
                         "received data, but no one needs it");
                  scratch_reset(usbvision);
            }
      }
      else {
            PDEBUG(DBG_IRQ, "received data, but no one needs it");
            scratch_reset(usbvision);
      }

      usbvision->timeInIrq += jiffies - startTime;

      for (i = 0; i < USBVISION_URB_FRAMES; i++) {
            urb->iso_frame_desc[i].status = 0;
            urb->iso_frame_desc[i].actual_length = 0;
      }

      urb->status = 0;
      urb->dev = usbvision->dev;
      errCode = usb_submit_urb (urb, GFP_ATOMIC);

      if(errCode) {
            dev_err(&usbvision->dev->dev,
                  "%s: usb_submit_urb failed: error %d\n",
                        __func__, errCode);
      }

      return;
}

/*************************************/
/* Low level usbvision access functions */
/*************************************/

/*
 * usbvision_read_reg()
 *
 * return  < 0 -> Error
 *        >= 0 -> Data
 */

int usbvision_read_reg(struct usb_usbvision *usbvision, unsigned char reg)
{
      int errCode = 0;
      unsigned char buffer[1];

      if (!USBVISION_IS_OPERATIONAL(usbvision))
            return -1;

      errCode = usb_control_msg(usbvision->dev, usb_rcvctrlpipe(usbvision->dev, 1),
                        USBVISION_OP_CODE,
                        USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT,
                        0, (__u16) reg, buffer, 1, HZ);

      if (errCode < 0) {
            dev_err(&usbvision->dev->dev,
                  "%s: failed: error %d\n", __func__, errCode);
            return errCode;
      }
      return buffer[0];
}

/*
 * usbvision_write_reg()
 *
 * return 1 -> Reg written
 *        0 -> usbvision is not yet ready
 *       -1 -> Something went wrong
 */

int usbvision_write_reg(struct usb_usbvision *usbvision, unsigned char reg,
                      unsigned char value)
{
      int errCode = 0;

      if (!USBVISION_IS_OPERATIONAL(usbvision))
            return 0;

      errCode = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
                        USBVISION_OP_CODE,
                        USB_DIR_OUT | USB_TYPE_VENDOR |
                        USB_RECIP_ENDPOINT, 0, (__u16) reg, &value, 1, HZ);

      if (errCode < 0) {
            dev_err(&usbvision->dev->dev,
                  "%s: failed: error %d\n", __func__, errCode);
      }
      return errCode;
}


static void usbvision_ctrlUrb_complete(struct urb *urb)
{
      struct usb_usbvision *usbvision = (struct usb_usbvision *)urb->context;

      PDEBUG(DBG_IRQ, "");
      usbvision->ctrlUrbBusy = 0;
      if (waitqueue_active(&usbvision->ctrlUrb_wq)) {
            wake_up_interruptible(&usbvision->ctrlUrb_wq);
      }
}


static int usbvision_write_reg_irq(struct usb_usbvision *usbvision,int address,
                                                      unsigned char *data, int len)
{
      int errCode = 0;

      PDEBUG(DBG_IRQ, "");
      if (len > 8) {
            return -EFAULT;
      }
      if (usbvision->ctrlUrbBusy) {
            return -EBUSY;
      }
      usbvision->ctrlUrbBusy = 1;

      usbvision->ctrlUrbSetup.bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT;
      usbvision->ctrlUrbSetup.bRequest     = USBVISION_OP_CODE;
      usbvision->ctrlUrbSetup.wValue       = 0;
      usbvision->ctrlUrbSetup.wIndex       = cpu_to_le16(address);
      usbvision->ctrlUrbSetup.wLength      = cpu_to_le16(len);
      usb_fill_control_urb (usbvision->ctrlUrb, usbvision->dev,
                                          usb_sndctrlpipe(usbvision->dev, 1),
                                          (unsigned char *)&usbvision->ctrlUrbSetup,
                                          (void *)usbvision->ctrlUrbBuffer, len,
                                          usbvision_ctrlUrb_complete,
                                          (void *)usbvision);

      memcpy(usbvision->ctrlUrbBuffer, data, len);

      errCode = usb_submit_urb(usbvision->ctrlUrb, GFP_ATOMIC);
      if (errCode < 0) {
            // error in usb_submit_urb()
            usbvision->ctrlUrbBusy = 0;
      }
      PDEBUG(DBG_IRQ, "submit %d byte: error %d", len, errCode);
      return errCode;
}


static int usbvision_init_compression(struct usb_usbvision *usbvision)
{
      int errCode = 0;

      usbvision->lastIsocFrameNum = -1;
      usbvision->isocDataCount = 0;
      usbvision->isocPacketCount = 0;
      usbvision->isocSkipCount = 0;
      usbvision->comprLevel = 50;
      usbvision->lastComprLevel = -1;
      usbvision->isocUrbCount = 0;
      usbvision->requestIntra = 1;
      usbvision->isocMeasureBandwidthCount = 0;

      return errCode;
}

/* this function measures the used bandwidth since last call
 * return:    0 : no error
 * sets usedBandwidth to 1-100 : 1-100% of full bandwidth resp. to isocPacketSize
 */
static int usbvision_measure_bandwidth (struct usb_usbvision *usbvision)
{
      int errCode = 0;

      if (usbvision->isocMeasureBandwidthCount < 2) { // this gives an average bandwidth of 3 frames
            usbvision->isocMeasureBandwidthCount++;
            return errCode;
      }
      if ((usbvision->isocPacketSize > 0) && (usbvision->isocPacketCount > 0)) {
            usbvision->usedBandwidth = usbvision->isocDataCount /
                              (usbvision->isocPacketCount + usbvision->isocSkipCount) *
                              100 / usbvision->isocPacketSize;
      }
      usbvision->isocMeasureBandwidthCount = 0;
      usbvision->isocDataCount = 0;
      usbvision->isocPacketCount = 0;
      usbvision->isocSkipCount = 0;
      return errCode;
}

static int usbvision_adjust_compression (struct usb_usbvision *usbvision)
{
      int errCode = 0;
      unsigned char buffer[6];

      PDEBUG(DBG_IRQ, "");
      if ((adjustCompression) && (usbvision->usedBandwidth > 0)) {
            usbvision->comprLevel += (usbvision->usedBandwidth - 90) / 2;
            RESTRICT_TO_RANGE(usbvision->comprLevel, 0, 100);
            if (usbvision->comprLevel != usbvision->lastComprLevel) {
                  int distorsion;
                  if (usbvision->bridgeType == BRIDGE_NT1004 || usbvision->bridgeType == BRIDGE_NT1005) {
                        buffer[0] = (unsigned char)(4 + 16 * usbvision->comprLevel / 100);      // PCM Threshold 1
                        buffer[1] = (unsigned char)(4 + 8 * usbvision->comprLevel / 100); // PCM Threshold 2
                        distorsion = 7 + 248 * usbvision->comprLevel / 100;
                        buffer[2] = (unsigned char)(distorsion & 0xFF);                   // Average distorsion Threshold (inter)
                        buffer[3] = (unsigned char)(distorsion & 0xFF);                   // Average distorsion Threshold (intra)
                        distorsion = 1 + 42 * usbvision->comprLevel / 100;
                        buffer[4] = (unsigned char)(distorsion & 0xFF);                   // Maximum distorsion Threshold (inter)
                        buffer[5] = (unsigned char)(distorsion & 0xFF);                   // Maximum distorsion Threshold (intra)
                  }
                  else { //BRIDGE_NT1003
                        buffer[0] = (unsigned char)(4 + 16 * usbvision->comprLevel / 100);      // PCM threshold 1
                        buffer[1] = (unsigned char)(4 + 8 * usbvision->comprLevel / 100); // PCM threshold 2
                        distorsion = 2 + 253 * usbvision->comprLevel / 100;
                        buffer[2] = (unsigned char)(distorsion & 0xFF);                   // distorsion threshold bit0-7
                        buffer[3] = 0;    //(unsigned char)((distorsion >> 8) & 0x0F);          // distorsion threshold bit 8-11
                        distorsion = 0 + 43 * usbvision->comprLevel / 100;
                        buffer[4] = (unsigned char)(distorsion & 0xFF);                   // maximum distorsion bit0-7
                        buffer[5] = 0; //(unsigned char)((distorsion >> 8) & 0x01);       // maximum distorsion bit 8
                  }
                  errCode = usbvision_write_reg_irq(usbvision, USBVISION_PCM_THR1, buffer, 6);
                  if (errCode == 0){
                        PDEBUG(DBG_IRQ, "new compr params %#02x %#02x %#02x %#02x %#02x %#02x", buffer[0],
                                                buffer[1], buffer[2], buffer[3], buffer[4], buffer[5]);
                        usbvision->lastComprLevel = usbvision->comprLevel;
                  }
            }
      }
      return errCode;
}

static int usbvision_request_intra (struct usb_usbvision *usbvision)
{
      int errCode = 0;
      unsigned char buffer[1];

      PDEBUG(DBG_IRQ, "");
      usbvision->requestIntra = 1;
      buffer[0] = 1;
      usbvision_write_reg_irq(usbvision, USBVISION_FORCE_INTRA, buffer, 1);
      return errCode;
}

static int usbvision_unrequest_intra (struct usb_usbvision *usbvision)
{
      int errCode = 0;
      unsigned char buffer[1];

      PDEBUG(DBG_IRQ, "");
      usbvision->requestIntra = 0;
      buffer[0] = 0;
      usbvision_write_reg_irq(usbvision, USBVISION_FORCE_INTRA, buffer, 1);
      return errCode;
}

/*******************************
 * usbvision utility functions
 *******************************/

int usbvision_power_off(struct usb_usbvision *usbvision)
{
      int errCode = 0;

      PDEBUG(DBG_FUNC, "");

      errCode = usbvision_write_reg(usbvision, USBVISION_PWR_REG, USBVISION_SSPND_EN);
      if (errCode == 1) {
            usbvision->power = 0;
      }
      PDEBUG(DBG_FUNC, "%s: errCode %d", (errCode!=1)?"ERROR":"power is off", errCode);
      return errCode;
}

/*
 * usbvision_set_video_format()
 *
 */
static int usbvision_set_video_format(struct usb_usbvision *usbvision, int format)
{
      static const char proc[] = "usbvision_set_video_format";
      int rc;
      unsigned char value[2];

      if (!USBVISION_IS_OPERATIONAL(usbvision))
            return 0;

      PDEBUG(DBG_FUNC, "isocMode %#02x", format);

      if ((format != ISOC_MODE_YUV422)
          && (format != ISOC_MODE_YUV420)
          && (format != ISOC_MODE_COMPRESS)) {
            printk(KERN_ERR "usbvision: unknown video format %02x, using default YUV420",
                   format);
            format = ISOC_MODE_YUV420;
      }
      value[0] = 0x0A;  //TODO: See the effect of the filter
      value[1] = format; // Sets the VO_MODE register which follows FILT_CONT
      rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
                       USBVISION_OP_CODE,
                       USB_DIR_OUT | USB_TYPE_VENDOR |
                       USB_RECIP_ENDPOINT, 0,
                       (__u16) USBVISION_FILT_CONT, value, 2, HZ);

      if (rc < 0) {
            printk(KERN_ERR "%s: ERROR=%d. USBVISION stopped - "
                   "reconnect or reload driver.\n", proc, rc);
      }
      usbvision->isocMode = format;
      return rc;
}

/*
 * usbvision_set_output()
 *
 */

int usbvision_set_output(struct usb_usbvision *usbvision, int width,
                   int height)
{
      int errCode = 0;
      int UsbWidth, UsbHeight;
      unsigned int frameRate=0, frameDrop=0;
      unsigned char value[4];

      if (!USBVISION_IS_OPERATIONAL(usbvision)) {
            return 0;
      }

      if (width > MAX_USB_WIDTH) {
            UsbWidth = width / 2;
            usbvision->stretch_width = 2;
      }
      else {
            UsbWidth = width;
            usbvision->stretch_width = 1;
      }

      if (height > MAX_USB_HEIGHT) {
            UsbHeight = height / 2;
            usbvision->stretch_height = 2;
      }
      else {
            UsbHeight = height;
            usbvision->stretch_height = 1;
      }

      RESTRICT_TO_RANGE(UsbWidth, MIN_FRAME_WIDTH, MAX_USB_WIDTH);
      UsbWidth &= ~(MIN_FRAME_WIDTH-1);
      RESTRICT_TO_RANGE(UsbHeight, MIN_FRAME_HEIGHT, MAX_USB_HEIGHT);
      UsbHeight &= ~(1);

      PDEBUG(DBG_FUNC, "usb %dx%d; screen %dx%d; stretch %dx%d",
                                    UsbWidth, UsbHeight, width, height,
                                    usbvision->stretch_width, usbvision->stretch_height);

      /* I'll not rewrite the same values */
      if ((UsbWidth != usbvision->curwidth) || (UsbHeight != usbvision->curheight)) {
            value[0] = UsbWidth & 0xff;         //LSB
            value[1] = (UsbWidth >> 8) & 0x03;  //MSB
            value[2] = UsbHeight & 0xff;        //LSB
            value[3] = (UsbHeight >> 8) & 0x03; //MSB

            errCode = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
                       USBVISION_OP_CODE,
                       USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT,
                         0, (__u16) USBVISION_LXSIZE_O, value, 4, HZ);

            if (errCode < 0) {
                  dev_err(&usbvision->dev->dev,
                        "%s failed: error %d\n", __func__, errCode);
                  return errCode;
            }
            usbvision->curwidth = usbvision->stretch_width * UsbWidth;
            usbvision->curheight = usbvision->stretch_height * UsbHeight;
      }

      if (usbvision->isocMode == ISOC_MODE_YUV422) {
            frameRate = (usbvision->isocPacketSize * 1000) / (UsbWidth * UsbHeight * 2);
      }
      else if (usbvision->isocMode == ISOC_MODE_YUV420) {
            frameRate = (usbvision->isocPacketSize * 1000) / ((UsbWidth * UsbHeight * 12) / 8);
      }
      else {
            frameRate = FRAMERATE_MAX;
      }

      if (usbvision->tvnormId & V4L2_STD_625_50) {
            frameDrop = frameRate * 32 / 25 - 1;
      }
      else if (usbvision->tvnormId & V4L2_STD_525_60) {
            frameDrop = frameRate * 32 / 30 - 1;
      }

      RESTRICT_TO_RANGE(frameDrop, FRAMERATE_MIN, FRAMERATE_MAX);

      PDEBUG(DBG_FUNC, "frameRate %d fps, frameDrop %d", frameRate, frameDrop);

      frameDrop = FRAMERATE_MAX;    // We can allow the maximum here, because dropping is controlled

      /* frameDrop = 7; => framePhase = 1, 5, 9, 13, 17, 21, 25, 0, 4, 8, ...
            => frameSkip = 4;
            => frameRate = (7 + 1) * 25 / 32 = 200 / 32 = 6.25;

         frameDrop = 9; => framePhase = 1, 5, 8, 11, 14, 17, 21, 24, 27, 1, 4, 8, ...
          => frameSkip = 4, 3, 3, 3, 3, 4, 3, 3, 3, 3, 4, ...
            => frameRate = (9 + 1) * 25 / 32 = 250 / 32 = 7.8125;
      */
      errCode = usbvision_write_reg(usbvision, USBVISION_FRM_RATE, frameDrop);
      return errCode;
}


/*
 * usbvision_frames_alloc
 * allocate the required frames
 */
int usbvision_frames_alloc(struct usb_usbvision *usbvision, int number_of_frames)
{
      int i;

      /*needs to be page aligned cause the buffers can be mapped individually! */
      usbvision->max_frame_size =  PAGE_ALIGN(usbvision->curwidth *
                                    usbvision->curheight *
                                    usbvision->palette.bytes_per_pixel);

      /* Try to do my best to allocate the frames the user want in the remaining memory */
      usbvision->num_frames = number_of_frames;
      while (usbvision->num_frames > 0) {
            usbvision->fbuf_size = usbvision->num_frames * usbvision->max_frame_size;
            if((usbvision->fbuf = usbvision_rvmalloc(usbvision->fbuf_size))) {
                  break;
            }
            usbvision->num_frames--;
      }

      spin_lock_init(&usbvision->queue_lock);
      init_waitqueue_head(&usbvision->wait_frame);
      init_waitqueue_head(&usbvision->wait_stream);

      /* Allocate all buffers */
      for (i = 0; i < usbvision->num_frames; i++) {
            usbvision->frame[i].index = i;
            usbvision->frame[i].grabstate = FrameState_Unused;
            usbvision->frame[i].data = usbvision->fbuf +
                  i * usbvision->max_frame_size;
            /*
             * Set default sizes for read operation.
             */
            usbvision->stretch_width = 1;
            usbvision->stretch_height = 1;
            usbvision->frame[i].width = usbvision->curwidth;
            usbvision->frame[i].height = usbvision->curheight;
            usbvision->frame[i].bytes_read = 0;
      }
      PDEBUG(DBG_FUNC, "allocated %d frames (%d bytes per frame)",usbvision->num_frames,usbvision->max_frame_size);
      return usbvision->num_frames;
}

/*
 * usbvision_frames_free
 * frees memory allocated for the frames
 */
void usbvision_frames_free(struct usb_usbvision *usbvision)
{
      /* Have to free all that memory */
      PDEBUG(DBG_FUNC, "free %d frames",usbvision->num_frames);

      if (usbvision->fbuf != NULL) {
            usbvision_rvfree(usbvision->fbuf, usbvision->fbuf_size);
            usbvision->fbuf = NULL;

            usbvision->num_frames = 0;
      }
}
/*
 * usbvision_empty_framequeues()
 * prepare queues for incoming and outgoing frames
 */
void usbvision_empty_framequeues(struct usb_usbvision *usbvision)
{
      u32 i;

      INIT_LIST_HEAD(&(usbvision->inqueue));
      INIT_LIST_HEAD(&(usbvision->outqueue));

      for (i = 0; i < USBVISION_NUMFRAMES; i++) {
            usbvision->frame[i].grabstate = FrameState_Unused;
            usbvision->frame[i].bytes_read = 0;
      }
}

/*
 * usbvision_stream_interrupt()
 * stops streaming
 */
int usbvision_stream_interrupt(struct usb_usbvision *usbvision)
{
      int ret = 0;

      /* stop reading from the device */

      usbvision->streaming = Stream_Interrupt;
      ret = wait_event_timeout(usbvision->wait_stream,
                         (usbvision->streaming == Stream_Idle),
                         msecs_to_jiffies(USBVISION_NUMSBUF*USBVISION_URB_FRAMES));
      return ret;
}

/*
 * usbvision_set_compress_params()
 *
 */

static int usbvision_set_compress_params(struct usb_usbvision *usbvision)
{
      static const char proc[] = "usbvision_set_compresion_params: ";
      int rc;
      unsigned char value[6];

      value[0] = 0x0F;    // Intra-Compression cycle
      value[1] = 0x01;    // Reg.45 one line per strip
      value[2] = 0x00;    // Reg.46 Force intra mode on all new frames
      value[3] = 0x00;    // Reg.47 FORCE_UP <- 0 normal operation (not force)
      value[4] = 0xA2;    // Reg.48 BUF_THR I'm not sure if this does something in not compressed mode.
      value[5] = 0x00;    // Reg.49 DVI_YUV This has nothing to do with compression

      //catched values for NT1004
      // value[0] = 0xFF; // Never apply intra mode automatically
      // value[1] = 0xF1; // Use full frame height for virtual strip width; One line per strip
      // value[2] = 0x01; // Force intra mode on all new frames
      // value[3] = 0x00; // Strip size 400 Bytes; do not force up
      // value[4] = 0xA2; //
      if (!USBVISION_IS_OPERATIONAL(usbvision))
            return 0;

      rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
                       USBVISION_OP_CODE,
                       USB_DIR_OUT | USB_TYPE_VENDOR |
                       USB_RECIP_ENDPOINT, 0,
                       (__u16) USBVISION_INTRA_CYC, value, 5, HZ);

      if (rc < 0) {
            printk(KERN_ERR "%sERROR=%d. USBVISION stopped - "
                   "reconnect or reload driver.\n", proc, rc);
            return rc;
      }

      if (usbvision->bridgeType == BRIDGE_NT1004) {
            value[0] =  20; // PCM Threshold 1
            value[1] =  12; // PCM Threshold 2
            value[2] = 255; // Distorsion Threshold inter
            value[3] = 255; // Distorsion Threshold intra
            value[4] =  43; // Max Distorsion inter
            value[5] =  43; // Max Distorsion intra
      }
      else {
            value[0] =  20; // PCM Threshold 1
            value[1] =  12; // PCM Threshold 2
            value[2] = 255; // Distorsion Threshold d7-d0
            value[3] =   0; // Distorsion Threshold d11-d8
            value[4] =  43; // Max Distorsion d7-d0
            value[5] =   0; // Max Distorsion d8
      }

      if (!USBVISION_IS_OPERATIONAL(usbvision))
            return 0;

      rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
                       USBVISION_OP_CODE,
                       USB_DIR_OUT | USB_TYPE_VENDOR |
                       USB_RECIP_ENDPOINT, 0,
                       (__u16) USBVISION_PCM_THR1, value, 6, HZ);

      if (rc < 0) {
            printk(KERN_ERR "%sERROR=%d. USBVISION stopped - "
                   "reconnect or reload driver.\n", proc, rc);
            return rc;
      }


      return rc;
}


/*
 * usbvision_set_input()
 *
 * Set the input (saa711x, ...) size x y and other misc input params
 * I've no idea if this parameters are right
 *
 */
int usbvision_set_input(struct usb_usbvision *usbvision)
{
      static const char proc[] = "usbvision_set_input: ";
      int rc;
      unsigned char value[8];
      unsigned char dvi_yuv_value;

      if (!USBVISION_IS_OPERATIONAL(usbvision))
            return 0;

      /* Set input format expected from decoder*/
      if (usbvision_device_data[usbvision->DevModel].Vin_Reg1_override) {
            value[0] = usbvision_device_data[usbvision->DevModel].Vin_Reg1;
      } else if(usbvision_device_data[usbvision->DevModel].Codec == CODEC_SAA7113) {
            /* SAA7113 uses 8 bit output */
            value[0] = USBVISION_8_422_SYNC;
      } else {
            /* I'm sure only about d2-d0 [010] 16 bit 4:2:2 usin sync pulses
             * as that is how saa7111 is configured */
            value[0] = USBVISION_16_422_SYNC;
            /* | USBVISION_VSNC_POL | USBVISION_VCLK_POL);*/
      }

      rc = usbvision_write_reg(usbvision, USBVISION_VIN_REG1, value[0]);
      if (rc < 0) {
            printk(KERN_ERR "%sERROR=%d. USBVISION stopped - "
                   "reconnect or reload driver.\n", proc, rc);
            return rc;
      }


      if (usbvision->tvnormId & V4L2_STD_PAL) {
            value[0] = 0xC0;
            value[1] = 0x02;  //0x02C0 -> 704 Input video line length
            value[2] = 0x20;
            value[3] = 0x01;  //0x0120 -> 288 Input video n. of lines
            value[4] = 0x60;
            value[5] = 0x00;  //0x0060 -> 96 Input video h offset
            value[6] = 0x16;
            value[7] = 0x00;  //0x0016 -> 22 Input video v offset
      } else if (usbvision->tvnormId & V4L2_STD_SECAM) {
            value[0] = 0xC0;
            value[1] = 0x02;  //0x02C0 -> 704 Input video line length
            value[2] = 0x20;
            value[3] = 0x01;  //0x0120 -> 288 Input video n. of lines
            value[4] = 0x01;
            value[5] = 0x00;  //0x0001 -> 01 Input video h offset
            value[6] = 0x01;
            value[7] = 0x00;  //0x0001 -> 01 Input video v offset
      } else {    /* V4L2_STD_NTSC */
            value[0] = 0xD0;
            value[1] = 0x02;  //0x02D0 -> 720 Input video line length
            value[2] = 0xF0;
            value[3] = 0x00;  //0x00F0 -> 240 Input video number of lines
            value[4] = 0x50;
            value[5] = 0x00;  //0x0050 -> 80 Input video h offset
            value[6] = 0x10;
            value[7] = 0x00;  //0x0010 -> 16 Input video v offset
      }

      if (usbvision_device_data[usbvision->DevModel].X_Offset >= 0) {
            value[4]=usbvision_device_data[usbvision->DevModel].X_Offset & 0xff;
            value[5]=(usbvision_device_data[usbvision->DevModel].X_Offset & 0x0300) >> 8;
      }

      if (adjust_X_Offset != -1) {
            value[4] = adjust_X_Offset & 0xff;
            value[5] = (adjust_X_Offset & 0x0300) >> 8;
      }

      if (usbvision_device_data[usbvision->DevModel].Y_Offset >= 0) {
            value[6]=usbvision_device_data[usbvision->DevModel].Y_Offset & 0xff;
            value[7]=(usbvision_device_data[usbvision->DevModel].Y_Offset & 0x0300) >> 8;
      }

      if (adjust_Y_Offset != -1) {
            value[6] = adjust_Y_Offset & 0xff;
            value[7] = (adjust_Y_Offset & 0x0300) >> 8;
      }

      rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
                       USBVISION_OP_CODE, /* USBVISION specific code */
                       USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_ENDPOINT, 0,
                       (__u16) USBVISION_LXSIZE_I, value, 8, HZ);
      if (rc < 0) {
            printk(KERN_ERR "%sERROR=%d. USBVISION stopped - "
                   "reconnect or reload driver.\n", proc, rc);
            return rc;
      }


      dvi_yuv_value = 0x00;   /* U comes after V, Ya comes after U/V, Yb comes after Yb */

      if(usbvision_device_data[usbvision->DevModel].Dvi_yuv_override){
            dvi_yuv_value = usbvision_device_data[usbvision->DevModel].Dvi_yuv;
      }
      else if(usbvision_device_data[usbvision->DevModel].Codec == CODEC_SAA7113) {
      /* This changes as the fine sync control changes. Further investigation necessary */
            dvi_yuv_value = 0x06;
      }

      return (usbvision_write_reg(usbvision, USBVISION_DVI_YUV, dvi_yuv_value));
}


/*
 * usbvision_set_dram_settings()
 *
 * Set the buffer address needed by the usbvision dram to operate
 * This values has been taken with usbsnoop.
 *
 */

static int usbvision_set_dram_settings(struct usb_usbvision *usbvision)
{
      int rc;
      unsigned char value[8];

      if (usbvision->isocMode == ISOC_MODE_COMPRESS) {
            value[0] = 0x42;
            value[1] = 0x71;
            value[2] = 0xff;
            value[3] = 0x00;
            value[4] = 0x98;
            value[5] = 0xe0;
            value[6] = 0x71;
            value[7] = 0xff;
            // UR:  0x0E200-0x3FFFF = 204288 Words (1 Word = 2 Byte)
            // FDL: 0x00000-0x0E099 =  57498 Words
            // VDW: 0x0E3FF-0x3FFFF
      }
      else {
            value[0] = 0x42;
            value[1] = 0x00;
            value[2] = 0xff;
            value[3] = 0x00;
            value[4] = 0x00;
            value[5] = 0x00;
            value[6] = 0x00;
            value[7] = 0xff;
      }
      /* These are the values of the address of the video buffer,
       * they have to be loaded into the USBVISION_DRM_PRM1-8
       *
       * Start address of video output buffer for read:     drm_prm1-2 -> 0x00000
       * End address of video output buffer for read:       drm_prm1-3 -> 0x1ffff
       * Start address of video frame delay buffer:         drm_prm1-4 -> 0x20000
       *    Only used in compressed mode
       * End address of video frame delay buffer:           drm_prm1-5-6 -> 0x3ffff
       *    Only used in compressed mode
       * Start address of video output buffer for write:    drm_prm1-7 -> 0x00000
       * End address of video output buffer for write:      drm_prm1-8 -> 0x1ffff
       */

      if (!USBVISION_IS_OPERATIONAL(usbvision))
            return 0;

      rc = usb_control_msg(usbvision->dev, usb_sndctrlpipe(usbvision->dev, 1),
                       USBVISION_OP_CODE, /* USBVISION specific code */
                       USB_DIR_OUT | USB_TYPE_VENDOR |
                       USB_RECIP_ENDPOINT, 0,
                       (__u16) USBVISION_DRM_PRM1, value, 8, HZ);

      if (rc < 0) {
            dev_err(&usbvision->dev->dev, "%sERROR=%d\n", __func__, rc);
            return rc;
      }

      /* Restart the video buffer logic */
      if ((rc = usbvision_write_reg(usbvision, USBVISION_DRM_CONT, USBVISION_RES_UR |
                           USBVISION_RES_FDL | USBVISION_RES_VDW)) < 0)
            return rc;
      rc = usbvision_write_reg(usbvision, USBVISION_DRM_CONT, 0x00);

      return rc;
}

/*
 * ()
 *
 * Power on the device, enables suspend-resume logic
 * &  reset the isoc End-Point
 *
 */

int usbvision_power_on(struct usb_usbvision *usbvision)
{
      int errCode = 0;

      PDEBUG(DBG_FUNC, "");

      usbvision_write_reg(usbvision, USBVISION_PWR_REG, USBVISION_SSPND_EN);
      usbvision_write_reg(usbvision, USBVISION_PWR_REG,
                   USBVISION_SSPND_EN | USBVISION_RES2);

      usbvision_write_reg(usbvision, USBVISION_PWR_REG,
                   USBVISION_SSPND_EN | USBVISION_PWR_VID);
      errCode = usbvision_write_reg(usbvision, USBVISION_PWR_REG,
                                    USBVISION_SSPND_EN | USBVISION_PWR_VID | USBVISION_RES2);
      if (errCode == 1) {
            usbvision->power = 1;
      }
      PDEBUG(DBG_FUNC, "%s: errCode %d", (errCode<0)?"ERROR":"power is on", errCode);
      return errCode;
}


/*
 * usbvision timer stuff
 */

// to call usbvision_power_off from task queue
static void call_usbvision_power_off(struct work_struct *work)
{
      struct usb_usbvision *usbvision = container_of(work, struct usb_usbvision, powerOffWork);

      PDEBUG(DBG_FUNC, "");
      if(mutex_lock_interruptible(&usbvision->lock)) {
            return;
      }


      if(usbvision->user == 0) {
            usbvision_i2c_unregister(usbvision);

            usbvision_power_off(usbvision);
            usbvision->initialized = 0;
      }
      mutex_unlock(&usbvision->lock);
}

static void usbvision_powerOffTimer(unsigned long data)
{
      struct usb_usbvision *usbvision = (void *) data;

      PDEBUG(DBG_FUNC, "");
      del_timer(&usbvision->powerOffTimer);
      INIT_WORK(&usbvision->powerOffWork, call_usbvision_power_off);
      (void) schedule_work(&usbvision->powerOffWork);
}

void usbvision_init_powerOffTimer(struct usb_usbvision *usbvision)
{
      init_timer(&usbvision->powerOffTimer);
      usbvision->powerOffTimer.data = (long) usbvision;
      usbvision->powerOffTimer.function = usbvision_powerOffTimer;
}

void usbvision_set_powerOffTimer(struct usb_usbvision *usbvision)
{
      mod_timer(&usbvision->powerOffTimer, jiffies + USBVISION_POWEROFF_TIME);
}

void usbvision_reset_powerOffTimer(struct usb_usbvision *usbvision)
{
      if (timer_pending(&usbvision->powerOffTimer)) {
            del_timer(&usbvision->powerOffTimer);
      }
}

/*
 * usbvision_begin_streaming()
 * Sure you have to put bit 7 to 0, if not incoming frames are droped, but no
 * idea about the rest
 */
int usbvision_begin_streaming(struct usb_usbvision *usbvision)
{
      int errCode = 0;

      if (usbvision->isocMode == ISOC_MODE_COMPRESS) {
            usbvision_init_compression(usbvision);
      }
      errCode = usbvision_write_reg(usbvision, USBVISION_VIN_REG2, USBVISION_NOHVALID |
                                                            usbvision->Vin_Reg2_Preset);
      return errCode;
}

/*
 * usbvision_restart_isoc()
 * Not sure yet if touching here PWR_REG make loose the config
 */

int usbvision_restart_isoc(struct usb_usbvision *usbvision)
{
      int ret;

      if (
          (ret =
           usbvision_write_reg(usbvision, USBVISION_PWR_REG,
                        USBVISION_SSPND_EN | USBVISION_PWR_VID)) < 0)
            return ret;
      if (
          (ret =
           usbvision_write_reg(usbvision, USBVISION_PWR_REG,
                        USBVISION_SSPND_EN | USBVISION_PWR_VID |
                        USBVISION_RES2)) < 0)
            return ret;
      if (
          (ret =
           usbvision_write_reg(usbvision, USBVISION_VIN_REG2,
                        USBVISION_KEEP_BLANK | USBVISION_NOHVALID |
                          usbvision->Vin_Reg2_Preset)) < 0) return ret;

      /* TODO: schedule timeout */
      while ((usbvision_read_reg(usbvision, USBVISION_STATUS_REG) & 0x01) != 1);

      return 0;
}

int usbvision_audio_off(struct usb_usbvision *usbvision)
{
      if (usbvision_write_reg(usbvision, USBVISION_IOPIN_REG, USBVISION_AUDIO_MUTE) < 0) {
            printk(KERN_ERR "usbvision_audio_off: can't wirte reg\n");
            return -1;
      }
      usbvision->AudioMute = 0;
      usbvision->AudioChannel = USBVISION_AUDIO_MUTE;
      return 0;
}

int usbvision_set_audio(struct usb_usbvision *usbvision, int AudioChannel)
{
      if (!usbvision->AudioMute) {
            if (usbvision_write_reg(usbvision, USBVISION_IOPIN_REG, AudioChannel) < 0) {
                  printk(KERN_ERR "usbvision_set_audio: can't write iopin register for audio switching\n");
                  return -1;
            }
      }
      usbvision->AudioChannel = AudioChannel;
      return 0;
}

int usbvision_setup(struct usb_usbvision *usbvision,int format)
{
      usbvision_set_video_format(usbvision, format);
      usbvision_set_dram_settings(usbvision);
      usbvision_set_compress_params(usbvision);
      usbvision_set_input(usbvision);
      usbvision_set_output(usbvision, MAX_USB_WIDTH, MAX_USB_HEIGHT);
      usbvision_restart_isoc(usbvision);

      /* cosas del PCM */
      return USBVISION_IS_OPERATIONAL(usbvision);
}

int usbvision_set_alternate(struct usb_usbvision *dev)
{
      int errCode, prev_alt = dev->ifaceAlt;
      int i;

      dev->ifaceAlt=0;
      for(i=0;i< dev->num_alt; i++)
            if(dev->alt_max_pkt_size[i]>dev->alt_max_pkt_size[dev->ifaceAlt])
                  dev->ifaceAlt=i;

      if (dev->ifaceAlt != prev_alt) {
            dev->isocPacketSize = dev->alt_max_pkt_size[dev->ifaceAlt];
            PDEBUG(DBG_FUNC,"setting alternate %d with wMaxPacketSize=%u", dev->ifaceAlt,dev->isocPacketSize);
            errCode = usb_set_interface(dev->dev, dev->iface, dev->ifaceAlt);
            if (errCode < 0) {
                  dev_err(&dev->dev->dev,
                        "cannot change alternate number to %d (error=%i)\n",
                              dev->ifaceAlt, errCode);
                  return errCode;
            }
      }

      PDEBUG(DBG_ISOC, "ISO Packet Length:%d", dev->isocPacketSize);

      return 0;
}

/*
 * usbvision_init_isoc()
 *
 */
int usbvision_init_isoc(struct usb_usbvision *usbvision)
{
      struct usb_device *dev = usbvision->dev;
      int bufIdx, errCode, regValue;
      int sb_size;

      if (!USBVISION_IS_OPERATIONAL(usbvision))
            return -EFAULT;

      usbvision->curFrame = NULL;
      scratch_reset(usbvision);

      /* Alternate interface 1 is is the biggest frame size */
      errCode = usbvision_set_alternate(usbvision);
      if (errCode < 0) {
            usbvision->last_error = errCode;
            return -EBUSY;
      }
      sb_size = USBVISION_URB_FRAMES * usbvision->isocPacketSize;

      regValue = (16 - usbvision_read_reg(usbvision,
                                  USBVISION_ALTER_REG)) & 0x0F;

      usbvision->usb_bandwidth = regValue >> 1;
      PDEBUG(DBG_ISOC, "USB Bandwidth Usage: %dMbit/Sec",
             usbvision->usb_bandwidth);



      /* We double buffer the Iso lists */

      for (bufIdx = 0; bufIdx < USBVISION_NUMSBUF; bufIdx++) {
            int j, k;
            struct urb *urb;

            urb = usb_alloc_urb(USBVISION_URB_FRAMES, GFP_KERNEL);
            if (urb == NULL) {
                  dev_err(&usbvision->dev->dev,
                        "%s: usb_alloc_urb() failed\n", __func__);
                  return -ENOMEM;
            }
            usbvision->sbuf[bufIdx].urb = urb;
            usbvision->sbuf[bufIdx].data =
                  usb_buffer_alloc(usbvision->dev,
                               sb_size,
                               GFP_KERNEL,
                               &urb->transfer_dma);
            urb->dev = dev;
            urb->context = usbvision;
            urb->pipe = usb_rcvisocpipe(dev, usbvision->video_endp);
            urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
            urb->interval = 1;
            urb->transfer_buffer = usbvision->sbuf[bufIdx].data;
            urb->complete = usbvision_isocIrq;
            urb->number_of_packets = USBVISION_URB_FRAMES;
            urb->transfer_buffer_length =
                usbvision->isocPacketSize * USBVISION_URB_FRAMES;
            for (j = k = 0; j < USBVISION_URB_FRAMES; j++,
                 k += usbvision->isocPacketSize) {
                  urb->iso_frame_desc[j].offset = k;
                  urb->iso_frame_desc[j].length =
                        usbvision->isocPacketSize;
            }
      }

      /* Submit all URBs */
      for (bufIdx = 0; bufIdx < USBVISION_NUMSBUF; bufIdx++) {
                  errCode = usb_submit_urb(usbvision->sbuf[bufIdx].urb,
                                     GFP_KERNEL);
            if (errCode) {
                  dev_err(&usbvision->dev->dev,
                        "%s: usb_submit_urb(%d) failed: error %d\n",
                              __func__, bufIdx, errCode);
            }
      }

      usbvision->streaming = Stream_Idle;
      PDEBUG(DBG_ISOC, "%s: streaming=1 usbvision->video_endp=$%02x",
             __func__,
             usbvision->video_endp);
      return 0;
}

/*
 * usbvision_stop_isoc()
 *
 * This procedure stops streaming and deallocates URBs. Then it
 * activates zero-bandwidth alt. setting of the video interface.
 *
 */
void usbvision_stop_isoc(struct usb_usbvision *usbvision)
{
      int bufIdx, errCode, regValue;
      int sb_size = USBVISION_URB_FRAMES * usbvision->isocPacketSize;

      if ((usbvision->streaming == Stream_Off) || (usbvision->dev == NULL))
            return;

      /* Unschedule all of the iso td's */
      for (bufIdx = 0; bufIdx < USBVISION_NUMSBUF; bufIdx++) {
            usb_kill_urb(usbvision->sbuf[bufIdx].urb);
            if (usbvision->sbuf[bufIdx].data){
                  usb_buffer_free(usbvision->dev,
                              sb_size,
                              usbvision->sbuf[bufIdx].data,
                              usbvision->sbuf[bufIdx].urb->transfer_dma);
            }
            usb_free_urb(usbvision->sbuf[bufIdx].urb);
            usbvision->sbuf[bufIdx].urb = NULL;
      }

      PDEBUG(DBG_ISOC, "%s: streaming=Stream_Off\n", __func__);
      usbvision->streaming = Stream_Off;

      if (!usbvision->remove_pending) {

            /* Set packet size to 0 */
            usbvision->ifaceAlt=0;
            errCode = usb_set_interface(usbvision->dev, usbvision->iface,
                                  usbvision->ifaceAlt);
            if (errCode < 0) {
                  dev_err(&usbvision->dev->dev,
                        "%s: usb_set_interface() failed: error %d\n",
                              __func__, errCode);
                  usbvision->last_error = errCode;
            }
            regValue = (16-usbvision_read_reg(usbvision, USBVISION_ALTER_REG)) & 0x0F;
            usbvision->isocPacketSize =
                  (regValue == 0) ? 0 : (regValue * 64) - 1;
            PDEBUG(DBG_ISOC, "ISO Packet Length:%d",
                   usbvision->isocPacketSize);

            usbvision->usb_bandwidth = regValue >> 1;
            PDEBUG(DBG_ISOC, "USB Bandwidth Usage: %dMbit/Sec",
                   usbvision->usb_bandwidth);
      }
}

int usbvision_muxsel(struct usb_usbvision *usbvision, int channel)
{
      /* inputs #0 and #3 are constant for every SAA711x. */
      /* inputs #1 and #2 are variable for SAA7111 and SAA7113 */
      int mode[4]= {SAA7115_COMPOSITE0, 0, 0, SAA7115_COMPOSITE3};
      int audio[]= {1, 0, 0, 0};
      //channel 0 is TV with audiochannel 1 (tuner mono)
      //channel 1 is Composite with audio channel 0 (line in)
      //channel 2 is S-Video with audio channel 0 (line in)
      //channel 3 is additional video inputs to the device with audio channel 0 (line in)

      RESTRICT_TO_RANGE(channel, 0, usbvision->video_inputs);
      usbvision->ctl_input = channel;

      // set the new channel
      // Regular USB TV Tuners -> channel: 0 = Television, 1 = Composite, 2 = S-Video
      // Four video input devices -> channel: 0 = Chan White, 1 = Chan Green, 2 = Chan Yellow, 3 = Chan Red

      switch (usbvision_device_data[usbvision->DevModel].Codec) {
            case CODEC_SAA7113:
                  mode[1] = SAA7115_COMPOSITE2;
                  if (SwitchSVideoInput) {
                        /* To handle problems with S-Video Input for
                         * some devices.  Use SwitchSVideoInput
                         * parameter when loading the module.*/
                        mode[2] = SAA7115_COMPOSITE1;
                  }
                  else {
                        mode[2] = SAA7115_SVIDEO1;
                  }
                  break;
            case CODEC_SAA7111:
            default:
                  /* modes for saa7111 */
                  mode[1] = SAA7115_COMPOSITE1;
                  mode[2] = SAA7115_SVIDEO1;
                  break;
      }
      call_all(usbvision, video, s_routing, mode[channel], 0, 0);
      usbvision_set_audio(usbvision, audio[channel]);
      return 0;
}

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-basic-offset: 8
 * End:
 */

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