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/*!***************************************************************************
*! FILE NAME  : circbuf.c
*! DESCRIPTION: drivers to manipulate large circular buffer that holds compressed
*! images/video. Buffer frame data is filled in by the FPGA, frame pointers and
*! essential frames metadata filled during servicing of the interruptsl
*! This code is based on the code from cxdma.c
*! TODO: Add buffer reset, JPEG header generation here
*!
*! Copyright (C) 2002-2007 Elphel, Inc
*! -----------------------------------------------------------------------------**
*!
*!  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 3 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, see <http://www.gnu.org/licenses/>.
*! -----------------------------------------------------------------------------**
*!  $Log: circbuf.c,v $
*!  Revision 1.3  2010/08/08 21:14:04  elphel
*!  8.0.8.38
*!
*!  Revision 1.2  2008/11/28 08:17:09  elphel
*!  keeping Doxygen a little happier
*!
*!  Revision 1.1.1.1  2008/11/27 20:04:00  elphel
*!
*!
*!  Revision 1.20  2008/11/20 07:06:24  elphel
*!  started more poll options
*!
*!  Revision 1.19  2008/11/03 20:51:49  elphel
*!  minor bug fix
*!
*!  Revision 1.18  2008/10/29 04:18:28  elphel
*!  v.8.0.alpha10 made a separate structure for global parameters (not related to particular frames in a frame queue)
*!
*!  Revision 1.17  2008/10/25 19:59:48  elphel
*!  added lseek() calls to enable/disable daemons at events (compressed frame available, any frame available, histogram-Y and histograms-C available)
*!
*!  Revision 1.16  2008/10/23 08:01:30  elphel
*!  comments
*!
*!  Revision 1.15  2008/10/19 06:50:03  elphel
*!  removed couple # if 0
*!
*!  Revision 1.14  2008/10/13 16:55:53  elphel
*!  removed (some) obsolete P_* parameters, renamed CIRCLSEEK to LSEEK_CIRC constants (same as other similar)
*!
*!  Revision 1.13  2008/10/12 16:46:22  elphel
*!  snapshot
*!
*!  Revision 1.12  2008/10/06 08:31:08  elphel
*!  snapshot, first images
*!
*!  Revision 1.11  2008/09/22 22:55:47  elphel
*!  snapshot
*!
*!  Revision 1.10  2008/09/20 00:29:49  elphel
*!  moved driver major/minor numbers to a single file - include/asm-cris/elphel/driver_numbers.h
*!
*!  Revision 1.9  2008/09/12 20:40:11  elphel
*!  snapshot
*!
*!  Revision 1.8  2008/09/12 00:23:58  elphel
*!  removed cc353.c, cc353.h
*!
*!  Revision 1.7  2008/09/11 01:05:29  elphel
*!  snapshot
*!
*!  Revision 1.6  2008/09/07 19:48:08  elphel
*!  snapshot
*!
*!  Revision 1.5  2008/09/05 23:20:26  elphel
*!  just a snapshot
*!
*!  Revision 1.4  2008/05/26 23:32:59  elphel
*!  Added driver to handle multi-frame parameters
*!
*!  Revision 1.3  2008/05/24 05:31:02  elphel
*!  removed seek to current hardware write pointer after opening file, so now ftp-ing circbuf file works correctly
*!
*!  Revision 1.2  2008/05/16 06:06:27  elphel
*!  adjusting drivers to the fpga code (03533020)
*!
*!  Revision 1.10  2008/04/11 23:16:51  elphel
*!  removed unneeded local_irq_disable() after local_irq_save_flags()
*!
*!  Revision 1.8  2007/12/03 08:28:46  elphel
*!  Multiple changes, mostly cleanup
*!
*!  Revision 1.7  2007/11/16 08:56:19  elphel
*!  Added support for 2 additional commands to check circbuf usage
*!
*!  Revision 1.6  2007/11/05 06:08:25  elphel
*!  fixed "first/second" bug introduced while fixing the previous one
*!
*!  Revision 1.5  2007/11/05 01:40:51  elphel
*!  fixed wrong count of frames available, "second" frame
*!
*!  Revision 1.4  2007/11/04 05:46:06  elphel
*!  removed debug, rearranged code to avoid a warning
*!
*!  Revision 1.3  2007/11/01 18:59:37  elphel
*!  debugging mmap/caching problems
*!
*!  Revision 1.2  2007/10/27 00:55:32  elphel
*!  untested revision - need to go
*!
*!  Revision 1.1.1.1  2007/10/02 23:54:58  elphel
*!  This is a fresh tree based on elphel353-2.10
*!
*!  Revision 1.6  2007/10/02 23:54:58  elphel
*!  LSEEK_CIRC_LAST will now return just write pointer, not an error if there are no frames yet available. Moving to previous will still generate error.
*!
*!  Revision 1.5  2007/10/02 22:29:38  elphel
*!  made that only 0,SEEK_END can move beyond circbuf, fro SEEK_CUR and SEET_SET it will roll over to 0
*!
*!  Revision 1.4  2007/10/02 19:35:15  elphel
*!  minor circbuf interface changes, bug fixes
*!
*!  Revision 1.3  2007/09/30 07:07:08  elphel
*!  minor bug fix, disabled debug output
*!
*!  Revision 1.2  2007/09/30 03:19:56  elphel
*!  Cleanup, fixed broken acquisition of individual JPEG images into circbuf (in mode 7)
*!
*!  Revision 1.1  2007/09/29 18:33:29  elphel
*!  Split cxdma.c - /dev/circbuf is now in a separate circbuf.c file. New device driver does not support ioctl, so some curernt applications are updated to use other drivers to control the camera
*!
*/

/****************** INCLUDE FILES SECTION ***********************************/


#include <linux/module.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/wait.h>
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#include <linux/dma-mapping.h>
#include <linux/errno.h>
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//#include <asm/system.h>
//#include <asm/arch/memmap.h>
//#include <asm/svinto.h> obsolete
#include <asm/io.h>

/*#include <asm/arch/dma.h>
#include <asm/arch/hwregs/dma_defs.h>
#include <asm/arch/hwregs/dma.h>
#include <asm/arch/hwregs/reg_map.h>
#include <asm/arch/hwregs/bif_dma_defs.h>
*/

#include <asm/irq.h>
#include <asm/atomic.h>


#include <asm/delay.h>
#include <asm/uaccess.h>
#include <elphel/driver_numbers.h>
#include <elphel/c313a.h>

#include "framepars.h" // just for ELPHEL_DEBUG bit mask

#include "sensor_common.h"
#include "jpeghead.h"
#include "circbuf.h"
#include "exif.h"
#if ELPHEL_DEBUG
  #define MDF(x) {printk("%s:%d:%s ",__FILE__,__LINE__,__FUNCTION__);x ;}
  #define   D19(x) { if (GLOBALPARS(G_DEBUG) & (1 <<19)) {x; } ; }
  #define MDF19(x) { if (GLOBALPARS(G_DEBUG) & (1 <<19)) {printk("%s:%d:%s ",__FILE__,__LINE__,__FUNCTION__ );x ;} }
  #define   D20(x) { if (GLOBALPARS(G_DEBUG) & (1 <<20)) {x; } ; }
  #define MDF20(x) { if (GLOBALPARS(G_DEBUG) & (1 <<20)) {printk("%s:%d:%s ",__FILE__,__LINE__,__FUNCTION__ );x ;} }
#else
  #define MDF(x)
  #define   D19(x)
  #define MDF19(x)
  #define   D20(x)
  #define MDF20(x)

#endif

#define MD12(x)
#define D(x)

//#define MD7(x) printk("%s:%d:",__FILE__,__LINE__);x
#define MD7(x)

//#define MD10(x) printk("%s:%d:",__FILE__,__LINE__);x
#define MD10(x)
//#define MD11(x) printk("%s:%d:",__FILE__,__LINE__);x
#define MD11(x)

/* really huge static DMA buffer (1288+8)*1032/3=445824 long-s */
// DMA_SIZE - in 32-bit words, not bytes
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//static unsigned long ccam_dma_buf[CCAM_DMA_SIZE + (PAGE_SIZE>>2)] __attribute__ ((aligned (PAGE_SIZE)));
static unsigned long *ccam_dma_buf = NULL;
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//!Without "static" system hangs after "Uncompressing Linux...
unsigned long  * ccam_dma_buf_ptr = NULL;
unsigned long * ccam_dma =         NULL; //! still used in autoexposure or something - why is in needed there?

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int init_ccam_dma_buf_ptr(void) {
	dma_addr_t *dma_handle;
    //ccam_dma_buf_ptr = ccam_dma_buf;
    //ccam_dma =         ccam_dma_buf; //&ccam_dma_buf[0]; Use in autoexposure

    ccam_dma_buf_ptr = dma_alloc_coherent(NULL, (CCAM_DMA_SIZE + (PAGE_SIZE >> 2)), dma_handle, GFP_KERNEL);
    if (!ccam_dma_buf_ptr) {
    	return -ENOMEM;
    } else {
    	printk(KERN_DEBUG "%s: dma memory allocated at 0x%08x", __func__, dma_handle);
    }
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}
extern struct interframe_params_t frame_params; // cc353.c
/*!======================================================================================
 *! Wait queue for the processes waiting for a new frame to appear in the circular buffer
 *!======================================================================================*/
wait_queue_head_t circbuf_wait_queue;
/*!=========================================================================================================
 *! circbuf top level device drivers. Minors are the same as before
 *! CMOSCAM_MINOR_CIRCBUF, CMOSCAM_MINOR_JPEAGHEAD - just a new major
 *!========================================================================================================*/
#define CIRCBUF_DRIVER_NAME "Elphel (R) Model 353 video buffer device driver"
static struct file_operations circbuf_fops = {
   owner:    THIS_MODULE,
   llseek:   circbuf_all_lseek,
   read:     circbuf_all_read,
   write:    circbuf_all_write,
   //ioctl:    circbuf_all_ioctl,
   open:     circbuf_all_open,
   mmap:     circbuf_all_mmap,
   poll:     circbuf_all_poll,
   release:  circbuf_all_release
};

// Read/write to circular buffer.  Needed to find out what Axis DMA is doing
// also - jpeg header
struct circbuf_pd {
    int       minor;        /// should be the first, same as in jpeghead_pd
    int       daemon_bit;   /// poll() will produce POLLHUP if this bit is >=0 (set through lseek (, LSEEK_DAEMON_CIRCBUF,SEEK_END)
                            /// and the corresponding bit in P_DAEMON_EN goes 0
    int       imageWidth;   /// image width to compare to current. G_SKIP_DIFF_FRAME
    int       imageHeight;  /// image height to compare to current. G_SKIP_DIFF_FRAME
    int       tolerated;    /// number of frames with different size tolerated
    struct wait_queue *circbuf_wait_queue; ///NOTE: not used at all?
// something else to be added here?
};
// CMOSCAM_MINOR_HUFFMAN // huffman tables R/W
int circbuf_all_open(struct inode *inode, struct file *filp) {
   int res;
 MD10(printk("circbuf_all_open, minor=0x%x\n",MINOR(inode->i_rdev)));
  switch (MINOR(inode->i_rdev)) {
    case  CMOSCAM_MINOR_CIRCBUF :
        res=circbuf_open(inode,filp);
        break;
    case  CMOSCAM_MINOR_JPEAGHEAD :
        res=jpeghead_open(inode,filp);
        break;
    case  CMOSCAM_MINOR_HUFFMAN :
        res=huffman_open(inode,filp);
        break;
    default:
//       kfree(filp->private_data); // already allocated
       return -EINVAL;
  }
  return res;
}
int circbuf_all_release(struct inode *inode, struct file *filp) {
  int res=0;
  int p = MINOR(inode->i_rdev);
 MD10(printk("circbuf_all_release, minor=0x%x\n",p));
  switch ( p ) {
    case  CMOSCAM_MINOR_CIRCBUF :
//        res=circbuf_release(inode,filp);
        break;
    case  CMOSCAM_MINOR_JPEAGHEAD :
//        res=jpeghead_release(inode,filp);
        break;
    case  CMOSCAM_MINOR_HUFFMAN :
//        res=huffman_release(inode,filp);
        break;
    default:
        return -EINVAL; //! do not need to free anything - "wrong number"
    }
  if (filp->private_data) kfree(filp->private_data);
  return res;
}

loff_t circbuf_all_lseek(struct file * file, loff_t offset, int orig) {
     struct circbuf_pd * privData;
     privData = (struct circbuf_pd *) file->private_data;
 MD10(printk("circbuf_all_lseek, minor=0x%x\n",privData-> minor));
     switch (privData->minor) {
       case CMOSCAM_MINOR_CIRCBUF :    return  circbuf_lseek  (file, offset, orig);
       case CMOSCAM_MINOR_JPEAGHEAD :  return  jpeghead_lseek (file, offset, orig);
       case CMOSCAM_MINOR_HUFFMAN :    return  huffman_lseek  (file, offset, orig);
       default:                        return -EINVAL;
     }
}

ssize_t circbuf_all_read(struct file * file, char * buf, size_t count, loff_t *off) {
     struct circbuf_pd * privData;
     privData = (struct circbuf_pd *) file->private_data;
 MD10(printk("circbuf_all_read, minor=0x%x\n",privData-> minor));
     switch (privData->minor) {
       case CMOSCAM_MINOR_CIRCBUF :      return  circbuf_read   (file, buf, count, off);
       case CMOSCAM_MINOR_JPEAGHEAD :    return  jpeghead_read  (file, buf, count, off);
       case CMOSCAM_MINOR_HUFFMAN :      return  huffman_read  (file, buf, count, off);
       default:                          return -EINVAL;
    }
}
ssize_t circbuf_all_write(struct file * file, const char * buf, size_t count, loff_t *off) {
     struct circbuf_pd * privData;
     privData = (struct circbuf_pd *) file->private_data;
 MD10(printk("circbuf_all_write, minor=0x%x, count=%d, off=%d\n",privData-> minor, (int) count,(int)*off));
     switch (privData->minor) {
       case CMOSCAM_MINOR_CIRCBUF :       return  circbuf_write  (file, buf, count, off);
//       case CMOSCAM_MINOR_JPEAGHEAD :     return  jpeghead_write (file, buf, count, off); // same as other - write header
       case CMOSCAM_MINOR_HUFFMAN :       return  huffman_write  (file, buf, count, off);
       default:                           return -EINVAL;
    }
}


int circbuf_all_mmap (struct file *file, struct vm_area_struct *vma) {
     struct circbuf_pd * privData;
     privData = (struct circbuf_pd *) file->private_data;
 MD10(printk("circbuf_all_mmap, minor=0x%x\n",privData-> minor));
     switch (privData->minor) {
       case  CMOSCAM_MINOR_CIRCBUF :   return  circbuf_mmap   (file, vma);
       default: return -EINVAL;
    }
}

unsigned int circbuf_all_poll (struct file *file, poll_table *wait) {
     struct circbuf_pd * privData;
     privData = (struct circbuf_pd *) file->private_data;
 MD10(printk("circbuf_all_poll, minor=0x%x\n",privData-> minor));
     switch (privData->minor) {
       case  CMOSCAM_MINOR_CIRCBUF :
          return circbuf_poll (file, wait);
       default:                           return -EINVAL;
    }
}

int circbuf_all_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) {
     struct circbuf_pd * privData;
     privData = (struct circbuf_pd *) filp->private_data;
     printk("\n========== IOCTL is not implemented in circbuf_all_ioctl, minor=0x%x, cmd=0x%x, _IOC_NR(cmd)=0x%x, arg=0x%x\n",privData-> minor, (int) cmd, _IOC_NR(cmd), (int) arg);
     return -EINVAL;
}




int circbuf_open(struct inode *inode, struct file *filp) { // set filesize
   struct circbuf_pd * privData;
   privData= (struct circbuf_pd *) kmalloc(sizeof(struct circbuf_pd),GFP_KERNEL);
   if (!privData) return -ENOMEM;
   filp->private_data = privData;
   privData-> minor=MINOR(inode->i_rdev);

   inode->i_size = ((CCAM_DMA_SIZE) << 2);
 MD10(printk("circbuf_open, inode->i_size=0x%x\n", (int)inode->i_size));

//!should be removed (or else you can not ftp file - it will start from WP)
//   circbuf_lseek(filp, LSEEK_CIRC_LAST, SEEK_END); //! position at last acquired frame, ignore result
   return 0;
}

/*!=============================================================================================
 *! Overloading lseek with additional functionality (to avoid ioctls)
 *! with orig==SEEK_END lseek will treat (offset>0) as a command
 *! to manipulate frame pointer(s) or wait for the image to be ready
 *! using these commands
 *!  LSEEK_CIRC_TORP .- set filepointer to global (shared) read pointer
 *!  LSEEK_CIRC_TOWP  - set filepointer to FPGA write pointer (next frame to be acquired)
 *!  LSEEK_CIRC_PREV  - move pointer to the previous frame, return -EOVERFLOW if there are none
 *!  LSEEK_CIRC_NEXT  - advance pointer to the next frame, return -EOVERFLOW if was already
 *!      at the last
 *!  LSEEK_CIRC_LAST  - move pointer to the last acquired frame (default after open)
 *!      (it is combination of 2+3)
 *!  LSEEK_CIRC_FIRST - move pointer to the first acquired frame. It s not safe to rely
 *!                    on this pointer if more frames are expected - next incoming frame
 *!                    can overwrite this one.
 *!  LSEEK_CIRC_SCND -  move pointer to the second oldest acquired frame. A slightly safer
 *!                    to use instead of LSEEK_CIRC_FIRST when constant acquisition is on
 *!                    and sensor provides new frames - this frame will likely survive longer
 *!  LSEEK_CIRC_SETP -  save current pointer to global read pointer
 *!  LSEEK_CIRC_VALID - verify that the frame at current location is valid (not overrun in the buffer)
 *!                    Returns file pointer if valid, else - -1
 *!  LSEEK_CIRC_READY - verify frame at current loacation is available (valid and acquired)
 *!                    Returns file pointer if ready, else - -1
 *!  LSEEK_CIRC_WAIT - sleep until next frame is acquired 
 *! All commands but (LSEEK_CIRC_TOWP,LSEEK_CIRC_LAST,LSEEK_CIRC_FIRST) will return -EINVAL if read 
 *! pointer is not valid  (i.e buffer was overrun and data pointed is lost). if success they return
 *! the current (byte *) to the start of the frame data (parameters are at
 *! offsett =-32 from it)
 *! (0, SEEK_CUR) also verifies that the header is not overwritten. It can be used
 *! after buffering frame data to verify you got it all correctly
 *! SEEK_CUR also supports the circular nature of the buffer and rolls over if needed
 *! Additional commands for SEEK_END (they _DO_ modify the current file pointer !)
 *!  LSEEK_CIRC_FREE - returnes remaining memory in circbuf from the current file pointer,
 *!                   or -EINVAL if the pointer is invalid. As this command uses the buffer write pointer
 *!                   that is updated only when the complete frame is in the buffer, the actual
 *!                   free memory may be less by a whole frame if compressor is running.
 *!  LSEEK_CIRC_USED - returnes memory used in the in circbuf from the current file pointer,
 *!                   or -EINVAL if the pointer is invalid
 *!=============================================================================================*/
//!returns 0 if rp is a valid read ponter
//! returns 1 if there is a frame at this address
//! returns 0 if the pointer is for the frame yet to be acquired
//! returns -1 if there is no frame at this index
//! returns -2 if the rp is not 32-bytes aligned
//!sets *fpp to the frame header, including signature and length
int circbufValidPointer(int rp, struct interframe_params_t ** fpp) {
  if (rp & 0x1f) {  //!rp is not 32-bytes aligned
       MD10(printk("circbufValidPointer: misaligned pointer\n"));
       return -2;
  }
  int wp=camSeqGetJPEG_wp();
  int p= rp >> 2; // index inccam_dma_buf
  struct interframe_params_t * fp;
  fp = (struct interframe_params_t *) &ccam_dma_buf[X313_BUFFSUB(p, 8)]; //! 32 bytes before the frame pointer, may roll-over to the end of ccam_dma_buf

 MD10(printk("rp=0x%x (0x%x), offset=0x%x\n",rp,p,(int)&ccam_dma_buf[p]-(int)fp); dumpFrameParams(fp, "in circbufValidPointer:"));

  *fpp=fp;
 MD11(printk("p=0x%x , wp==0x%x\n",p,wp));
 if (p == wp) {
     return 0; // frame not yet acquired, fp - not valid
  }
  if (fp->signffff != 0xffff) { //! signature is overwritten
     MD10(printk("circbufValidPointer: signanure overwritten\n"));
     return -1;
  }
  if ((fp->timestamp_sec) & X313_LENGTH_MASK) {
     MDF(printk ("Should not get here - fp->timestamp_sec=0x%x\n",(int) fp->timestamp_sec));
     return 0; //! should not get here - should be caught by (p==wp)
  }
  return 1;
   
}

loff_t circbuf_lseek(struct file * file, loff_t offset, int orig) {
 //  orig 0: position from begning
 //  orig 1: relative from current
 //  orig 2: position from last  address
   int l = (CCAM_DMA_SIZE << 2);
   int fl=0;// frame length
   struct interframe_params_t * fp;
   int fvld=-1;
   int rp, bp, prev_p, preprev_p; //, p;
   int nf;   //! number of frames;
   int nz=1; //! number of crossing of start of the circular buffer (counter to prevent looping forever)
MD12(int dbg_i);
//   int pf; // previous frame
 MD11(printk("circbuf_lseek, offset=0x%x, orig=0x%x\n",(int) offset, (int) orig));
   switch(orig) {
   case SEEK_SET:
     file->f_pos = offset;
     break;
   case SEEK_CUR:
     if (offset) file->f_pos += offset;
     else if (circbufValidPointer(file->f_pos, &fp) <0 ) return -EINVAL; //!no frames at the specified location or pointer is not 32-byte aligned
     break;
   case SEEK_END:
     if (offset <= 0) {
        file->f_pos = l + offset;
     } else { //! New functionality
//!verify the frame pointer
        switch (offset) {
          case LSEEK_CIRC_TORP:
              file->f_pos=camSeqGetJPEG_rp()<<2; //! set file pointer to global read pointer, and proceed
          case LSEEK_CIRC_PREV:
          case LSEEK_CIRC_NEXT:
          case LSEEK_CIRC_SETP:
          case LSEEK_CIRC_VALID:
          case LSEEK_CIRC_READY:
          case LSEEK_CIRC_FREE:
          case LSEEK_CIRC_USED:
             if (((fvld=circbufValidPointer(file->f_pos, &fp))) <0 )
                return -EINVAL; //!no frames at the specified location
        }
        switch (offset) {
          case LSEEK_CIRC_FREE:
             bp=(file->f_pos - (camSeqGetJPEG_wp()<<2));
//             return (bp>0)?bp:(bp+l); //!will return full buffer size if current pointer is a write pointer (waiting for the next frame)
             return (file->f_pos=(bp>0)?bp:(bp+l)); //!Has a side effect of moving a file pointer!
          case LSEEK_CIRC_USED:
             bp=((camSeqGetJPEG_wp()<<2) - file->f_pos);
//             return (bp>=0)?bp:(bp+l); //!will return 0 if current pointer is a write pointer (waiting for the next frame)
             return (file->f_pos=(bp>0)?bp:(bp+l)); //!Has a side effect of moving a file pointer!
          case LSEEK_CIRC_TORP:
             break;
          case LSEEK_CIRC_TOWP:
             file->f_pos=camSeqGetJPEG_wp()<<2; // no checking if it is valid
             break;
          case LSEEK_CIRC_LAST:
             file->f_pos=camSeqGetJPEG_wp()<<2;
             fvld=circbufValidPointer(file->f_pos, &fp); //!set fp
          case LSEEK_CIRC_PREV:
             rp= file->f_pos >> 2;
             fl=ccam_dma_buf[X313_BUFFSUB(rp, 9)] ^ X313_LENGTH_MASK;
 MD11(printk("LSEEK_CIRC_PREV: rp=0x%x, fvld=%d, fl=0x%x\n", rp, fvld,fl));
             if (fl & X313_LENGTH_MASK) {
                if (offset==LSEEK_CIRC_LAST) break; // just don't move pointer, leave it at write pointer and return no error
                return -EOVERFLOW; //! no frames before current
             }
             bp = (X313_BUFFSUB(rp, X313_PADDED_FRAME(fl))<<2); // in bytes
 MD11(printk("LSEEK_CIRC_PREV: bp=0x%x (0x%x), circbufValidPointer=%d\n", bp, bp>>2,circbufValidPointer(rp>>2, &fp)));
             if (circbufValidPointer(bp, &fp) < 0 ) { //! no valid frames before current
                if (offset==LSEEK_CIRC_LAST) break; // just don't move pointer, leave it at write pointer and return no error
                return -EOVERFLOW; //! no frames before current
             }
 //! move frame pointer only if there is a valid frame there
             file->f_pos=bp;
             break;
          case LSEEK_CIRC_NEXT:
 MD11(printk("LSEEK_CIRC_NEXT: rp=0x%x, fvld=%d, fp->timestamp_sec=0x%x\n", file->f_pos >> 2, fvld, fp->timestamp_sec));
             if (fvld <=0) 
                return -EOVERFLOW; //! no frames after current
             file->f_pos = X313_BUFFADD(file->f_pos >> 2, X313_PADDED_FRAME(fp->timestamp_sec)) <<2 ;// do it even if the next frame does not yet exist
             break;
          case LSEEK_CIRC_FIRST:
          case LSEEK_CIRC_SCND:
//! Starting from the write pointer do be able to count all the frames in the buffer
             rp=camSeqGetJPEG_wp();
             prev_p=rp;
             preprev_p=prev_p; // for second
             nf=0;
             nz=1;
             file->f_pos=rp<<2;
             while ((((fvld=circbufValidPointer(rp<<2, &fp))) >= 0) & (nz>=0)) {
               nf++;
//               file->f_pos=rp<<2;
               preprev_p=prev_p; //! second known good (at least first one)
               prev_p=rp;        //!now - current, known good
               fl=ccam_dma_buf[X313_BUFFSUB(rp, 9)] ^ X313_LENGTH_MASK;
 MD11(printk("\nf=%d, rp=0x%x, fvld=%d, fl=0x%x\n",nf, rp, fvld, fl));
               if (fl & X313_LENGTH_MASK) break;  //! no frames before rp (==prev_p)
//! move rp to the previous frame
               rp= X313_BUFFSUB(rp, X313_PADDED_FRAME(fl));
               if (rp > prev_p) nz-- ; // rolled through zero - make sure we'll not stuck in this loop forever
             }

 MD11(printk("after while{}: nf=%d, rp=0x%x, fvld=%d, fl=0x%x\n",nf, rp, fvld, fl));
             file->f_pos=((offset==LSEEK_CIRC_SCND)?preprev_p:prev_p) << 2;
             break;
          case LSEEK_CIRC_SETP:
             camSeqSetJPEG_rp(file->f_pos>>2);
             break;
          case LSEEK_CIRC_VALID:
             break;
          case LSEEK_CIRC_READY:
             if (fvld <=0) return -EINVAL; //! no frame is available better code?
             break;
          case LSEEK_CIRC_WAIT:
              while (((fvld=circbufValidPointer(file->f_pos, &fp)))==0) { //! only while not ready, ready or BAD - return
                wait_event_interruptible(circbuf_wait_queue,(camSeqGetJPEG_wp()<<2)!=file->f_pos);
              }
              if (fvld < 0) return -ESPIPE;      //!invalid seek - have better code?
              return file->f_pos ; //! data already available, return file pointer
          default:
            if ((offset & ~0x1f)==LSEEK_DAEMON_CIRCBUF) {
              wait_event_interruptible(circbuf_wait_queue, get_imageParamsThis(P_DAEMON_EN) & (1<<(offset & 0x1f)));
            }
        }
        return ( file->f_pos ); //! file position >=0
     }
     break;
   default:
      return -EINVAL;
   }
   // roll-over position
   while (file->f_pos < 0) file->f_pos+=l;
   while (file->f_pos > l) file->f_pos-=l;
   if ((orig !=SEEK_END) && (file->f_pos == l)) file->f_pos=0; //!only for lseek (fd,0,SEEK_END) the result will be file size, others will roll to 0
   return  file->f_pos ;
}

ssize_t circbuf_write(struct file * file, const char * buf, size_t count, loff_t *off) {
   unsigned long p;
   char *char_pb = (char *)ccam_dma_buf;
   D(printk("circbuf_write\n"));
/// ************* NOTE: Never use file->f_pos in write() and read() !!!
   p = *off;
   if(p >= (CCAM_DMA_SIZE << 2))
     p = (CCAM_DMA_SIZE << 2);
   if((p + count) > (CCAM_DMA_SIZE << 2)) { // truncate count
     count = (CCAM_DMA_SIZE << 2) - p;
   }
   if(count) {
     if(copy_from_user(&char_pb[p], buf, count))
        return -EFAULT;
     *off += count;
   }
   return count;
}

ssize_t circbuf_read(struct file * file, char * buf, size_t count, loff_t *off) {
  unsigned long p;
  char * char_pb = (char *) ccam_dma_buf;
  p = *off;
  D(printk("circbuf_read pos=%d,count=%d, off=%d\r\n",p,count,off ));
  if (p >= (CCAM_DMA_SIZE<<2))  p = (CCAM_DMA_SIZE<<2);
  if( (p + count) > (CCAM_DMA_SIZE<<2)) { // truncate count
    count = (CCAM_DMA_SIZE<<2) - p;
  }
  if (count) {
    if (copy_to_user(buf, &char_pb[p], count)) return -EFAULT;
//    file->f_pos+=count;
    *off+=count;
  }
  return count;
}

int   circbuf_mmap   (struct file *file, struct vm_area_struct *vma) {

     int rslt;

     MD7(printk("vm_start=%lx\r\n",vma->vm_start));
     MD7(printk("vm_end=%lx\r\n",vma->vm_end));
     MD7(printk("vm_pgoff=%lx\r\n",vma->vm_pgoff));
     MD7(printk("vm_file=%lx\r\n",(unsigned long) (vma->vm_file)));
     MD7(printk("ccam_dma_buf=%lx\r\n",(unsigned long) (virt_to_phys (&ccam_dma_buf[0]))));
   /* Remap-pfn-range will mark the range VM_IO and VM_RESERVED */
     rslt=remap_pfn_range(vma,
             vma->vm_start,
//             ((unsigned long)(&ccam_dma_buf[0])) >> PAGE_SHIFT, // Should be page-aligned
             ((unsigned long) virt_to_phys(&ccam_dma_buf[0])) >> PAGE_SHIFT, // Should be page-aligned
             vma->vm_end-vma->vm_start,
             vma->vm_page_prot);

     MD7(printk("remap_pfn_range returned=%x\r\n",rslt));
     if (rslt) return -EAGAIN;
//   vma->vm_ops = &simple_remap_vm_ops;
//   simple_vma_open(vma);
     return 0;
}
/*!===========================================================================
 *! If the current read pointer is invalid, circbuf_poll returns POLLHUP
 *! as no data will be ever available until file poinetr is reset.
 *! if it is valid, wait is setup and the blocking condition occurs 
 *! ifthe current file pointer is equal to the FPGA write pointer
 *!===========================================================================*/
unsigned int circbuf_poll (struct file *file, poll_table *wait) {
     struct interframe_params_t * fp;
     struct circbuf_pd * privData;
     privData = (struct circbuf_pd *) file->private_data;
     int rslt; //!result of testing read poinetr
 MD10(printk("circbuf_poll\n"));
     rslt= circbufValidPointer(file->f_pos, &fp);
     if        (rslt < 0) { //! not a valid read pointer, probable buffer overrun 
 MD10(printk("circbuf_poll:invalid pointer\n"));
       return  POLLHUP ;
     } else if (rslt > 0) {
       return POLLIN | POLLRDNORM; //! there was frame already available
     } else { //! pointer valid, no frame yet
       poll_wait(file, &circbuf_wait_queue, wait);
//! Frame might become available during call to poll_wait so nobody will wake us up.
//! Let's see if there is stillno frame
	    if ((camSeqGetJPEG_wp()<<2)!=file->f_pos) return POLLIN | POLLRDNORM; //! we are lucky - got it
    }
    return 0; // nothing ready
}


static int __init circbuf_all_init(void) {
   int res;
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   printk(KERN_DEBUG "Loading %s", __func__);
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   MDF19(printk("\n"));
   res = register_chrdev(CIRCBUF_MAJOR, "circbuf_operations", &circbuf_fops);
   if(res < 0) {
     printk(KERN_ERR "\ncircbuf_all_init: couldn't get a major number %d.\n",CIRCBUF_MAJOR);
     return res;
   }

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   res = init_ccam_dma_buf_ptr();
   if (res < 0) {
	   printk(KERN_ERR "%s: ERROR allocating coherent DMA buffer\n", __func__);
	   return -ENOMEM;
   }

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   MDF19(printk("init_waitqueue_head()\n"));
   init_waitqueue_head(&circbuf_wait_queue);
   MDF19(printk("jpeg_htable_init()\n"));
   jpeg_htable_init ();         /// set default Huffman table, encode it for the FPGA
   printk(CIRCBUF_DRIVER_NAME"- %d\n",CIRCBUF_MAJOR);
   return 0;
}


module_init(circbuf_all_init);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Andrey Filippov <andrey@elphel.com>.");
MODULE_DESCRIPTION(CIRCBUF_DRIVER_NAME);