os/linux-2.6-tag--devboard-R2_10-4/arch/cris/arch-v32/drivers/elphel/circbuf.h File Reference

#include <linux/poll.h>

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Defines

#define X313_CHAIN_SIGNATURE   0xffffffff
#define X313_CHAIN_SIGNATURE4   0xffff0000
#define X313_LENGTH_MASK   0xff000000
#define X313_PADDED_FRAME(x)   ((((x)+67+CCAM_MMAP_META ) >>2) & 0xfffffff8)
#define X313_BUFFSUB(x, y)   (((x)>=(y))? ((x)-(y)) : ((x)+ (CCAM_DMA_SIZE-(y))))
#define X313_BUFFADD(x, y)   ((((x) + (y))<=CCAM_DMA_SIZE)? ((x) + (y)) : ((x) - (CCAM_DMA_SIZE-(y))))

Functions

int circbuf_all_open (struct inode *inode, struct file *filp)
int circbuf_all_release (struct inode *inode, struct file *filp)
loff_t circbuf_all_lseek (struct file *file, loff_t offset, int orig)
ssize_t circbuf_all_write (struct file *file, const char *buf, size_t count, loff_t *off)
ssize_t circbuf_all_read (struct file *file, char *buf, size_t count, loff_t *off)
int circbuf_all_mmap (struct file *file, struct vm_area_struct *vma)
unsigned int circbuf_all_poll (struct file *file, poll_table *wait)
int circbuf_all_ioctl (struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
 just to notify it is not implemented
int circbuf_open (struct inode *inode, struct file *filp)
loff_t circbuf_lseek (struct file *file, loff_t offset, int orig)
ssize_t circbuf_write (struct file *file, const char *buf, size_t count, loff_t *off)
ssize_t circbuf_read (struct file *file, char *buf, size_t count, loff_t *off)
int circbuf_mmap (struct file *file, struct vm_area_struct *vma)
unsigned int circbuf_poll (struct file *file, poll_table *wait)
int jpeghead_open (struct inode *inode, struct file *filp)
loff_t jpeghead_lseek (struct file *file, loff_t offset, int orig)
ssize_t jpeghead_read (struct file *file, char *buf, size_t count, loff_t *off)
ssize_t jpeghead_write (struct file *file, const char *buf, size_t count, loff_t *off)
void init_ccam_dma_buf_ptr (void)
 still used in autoexposure or something - why is in needed there?

Variables

unsigned long * ccam_dma_buf_ptr
 Without "static" system hangs after "Uncompressing Linux...
wait_queue_head_t circbuf_wait_queue

Define Documentation

#define X313_BUFFADD ( x,
y   )     ((((x) + (y))<=CCAM_DMA_SIZE)? ((x) + (y)) : ((x) - (CCAM_DMA_SIZE-(y))))

Definition at line 45 of file circbuf.h.

Referenced by circbuf_lseek(), ext_fill_jpeg_mmap_desc(), x313_dma_forget_jpeg(), and x313_dma_read().

#define X313_BUFFSUB ( x,
y   )     (((x)>=(y))? ((x)-(y)) : ((x)+ (CCAM_DMA_SIZE-(y))))

Definition at line 44 of file circbuf.h.

Referenced by circbuf_lseek(), circbufValidPointer(), jpeghead_lseek(), x313_dma_restore_jpeg(), and X313_dma_update().

#define X313_CHAIN_SIGNATURE   0xffffffff

Definition at line 38 of file circbuf.h.

Referenced by x313_dma_forget_jpeg(), x313_dma_reset_chain(), x313_DMA_size(), and X313_dma_update().

#define X313_CHAIN_SIGNATURE4   0xffff0000

Definition at line 39 of file circbuf.h.

Referenced by x313_dma_forget_jpeg(), x313_dma_reset_chain(), x313_DMA_size(), and X313_dma_update().

#define X313_LENGTH_MASK   0xff000000

Definition at line 41 of file circbuf.h.

Referenced by circbuf_lseek(), circbufValidPointer(), jpeghead_lseek(), and X313_dma_update().

#define X313_PADDED_FRAME ( x   )     ((((x)+67+CCAM_MMAP_META ) >>2) & 0xfffffff8)

Definition at line 43 of file circbuf.h.

Referenced by circbuf_lseek(), x313_dma_forget_jpeg(), and X313_dma_update().

Function Documentation

int circbuf_all_ioctl ( struct inode *  inode,
struct file *  filp,
unsigned int  cmd,
unsigned long  arg 
)

just to notify it is not implemented

Definition at line 295 of file circbuf.c.

References circbuf_pd::minor, and printk.

loff_t circbuf_all_lseek ( struct file *  file,
loff_t  offset,
int  orig 
)

Definition at line 241 of file circbuf.c.

References circbuf_lseek(), CMOSCAM_MINOR_CIRCBUF, CMOSCAM_MINOR_JPEAGHEAD, jpeghead_lseek(), MD10, circbuf_pd::minor, and printk.

int circbuf_all_mmap ( struct file *  file,
struct vm_area_struct *  vma 
)

Definition at line 274 of file circbuf.c.

References circbuf_mmap(), CMOSCAM_MINOR_CIRCBUF, MD10, circbuf_pd::minor, and printk.

int circbuf_all_open ( struct inode *  inode,
struct file *  filp 
)

Definition at line 202 of file circbuf.c.

References circbuf_open(), CMOSCAM_MINOR_CIRCBUF, CMOSCAM_MINOR_JPEAGHEAD, GFP_KERNEL, jpeghead_open(), kfree, kmalloc, MD10, circbuf_pd::minor, and printk.

unsigned int circbuf_all_poll ( struct file *  file,
poll_table *  wait 
)

Definition at line 284 of file circbuf.c.

References circbuf_poll(), CMOSCAM_MINOR_CIRCBUF, MD10, circbuf_pd::minor, and printk.

ssize_t circbuf_all_read ( struct file *  file,
char *  buf,
size_t  count,
loff_t *  off 
)

Definition at line 252 of file circbuf.c.

References circbuf_read(), CMOSCAM_MINOR_CIRCBUF, CMOSCAM_MINOR_JPEAGHEAD, jpeghead_read(), MD10, circbuf_pd::minor, and printk.

int circbuf_all_release ( struct inode *  inode,
struct file *  filp 
)

Definition at line 223 of file circbuf.c.

References CMOSCAM_MINOR_CIRCBUF, CMOSCAM_MINOR_JPEAGHEAD, kfree, MD10, and printk.

ssize_t circbuf_all_write ( struct file *  file,
const char *  buf,
size_t  count,
loff_t *  off 
)

Definition at line 262 of file circbuf.c.

References circbuf_write(), CMOSCAM_MINOR_CIRCBUF, CMOSCAM_MINOR_JPEAGHEAD, jpeghead_write(), MD10, circbuf_pd::minor, and printk.

loff_t circbuf_lseek ( struct file *  file,
loff_t  offset,
int  orig 
)

Definition at line 386 of file circbuf.c.

References camSeqGetJPEG_rp(), camSeqGetJPEG_wp(), camSeqSetJPEG_rp(), ccam_dma_buf, CCAM_DMA_SIZE, circbufValidPointer(), CIRCLSEEK_FIRST, CIRCLSEEK_FREE, CIRCLSEEK_LAST, CIRCLSEEK_NEXT, CIRCLSEEK_PREV, CIRCLSEEK_READY, CIRCLSEEK_SCND, CIRCLSEEK_SETP, CIRCLSEEK_TORP, CIRCLSEEK_TOWP, CIRCLSEEK_USED, CIRCLSEEK_VALID, CIRCLSEEK_WAIT, MD11, MD12, printk, rp, frame_params_t::timestamp_sec, X313_BUFFADD, X313_BUFFSUB, X313_LENGTH_MASK, and X313_PADDED_FRAME.

Referenced by circbuf_all_lseek(), and circbuf_open().

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

Definition at line 573 of file circbuf.c.

References ccam_dma_buf, MD7, and printk.

Referenced by circbuf_all_mmap().

int circbuf_open ( struct inode *  inode,
struct file *  filp 
)

Definition at line 305 of file circbuf.c.

References CCAM_DMA_SIZE, circbuf_lseek(), CIRCLSEEK_LAST, MD10, and printk.

Referenced by circbuf_all_open().

unsigned int circbuf_poll ( struct file *  file,
poll_table *  wait 
)

=========================================================================== ! 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 !===========================================================================

result of testing read poinetr

not a valid read pointer, probable buffer overrun

there was frame already available

pointer valid, no frame yet

Frame might become available during call to poll_wait so nobody will wake us up. Let's see if there is stillno frame

we are lucky - got it

Definition at line 602 of file circbuf.c.

References camSeqGetJPEG_wp(), circbufValidPointer(), MD10, and printk.

Referenced by circbuf_all_poll().

ssize_t circbuf_read ( struct file *  file,
char *  buf,
size_t  count,
loff_t *  off 
)

Definition at line 556 of file circbuf.c.

References ccam_dma_buf, CCAM_DMA_SIZE, D, and printk.

Referenced by circbuf_all_read().

ssize_t circbuf_write ( struct file *  file,
const char *  buf,
size_t  count,
loff_t *  off 
)

Definition at line 536 of file circbuf.c.

References ccam_dma_buf, CCAM_DMA_SIZE, D, and printk.

Referenced by circbuf_all_write().

void init_ccam_dma_buf_ptr ( void   ) 

still used in autoexposure or something - why is in needed there?

Definition at line 159 of file circbuf.c.

References ccam_dma_buf.

Referenced by cmoscam_init().

loff_t jpeghead_lseek ( struct file *  file,
loff_t  offset,
int  orig 
)

================================================================= ! Overloading lseek with additional functionality (to avoid ioctls) ! with orig==SEEK_END lseek will treat (offset>0) as a byte pointer ! in (char *)ccam_dma_buf of a frame pointer and use quality, ! width and height to regenerate header. ! frame pointers are 32-bytes aligned, so adding 1 to offest ! will make sure it is always >0 (as offset=0, orig=SEEK_END ! will just move pointer to the end and return file length. ! ! When called with orig==SEEK_END, offset>0 lseek will position ! file at the very beginning and return 0 if OK, -EINVAL if ! frame header is not found for the specified offset !================================================================

New functionality

32 bytes before the frame pointer, may roll-over to the end of ccam_dma_buf

signature is overwritten

acquisition of this frame is not done yet - length word high byte is non-zero

it is 0

Definition at line 650 of file circbuf.c.

References ccam_dma_buf, frame_params_t::height, JPEG_HEADER_SIZE, frame_params_t::quality, rp, setJPEGHeader(), frame_params_t::signffff, frame_params_t::timestamp_sec, frame_params_t::width, X313_BUFFSUB, and X313_LENGTH_MASK.

Referenced by circbuf_all_lseek().

int jpeghead_open ( struct inode *  inode,
struct file *  filp 
)

make it blocking to use shared resource - jpeg header that may need re-calculation for different requests? or use individual header arrays?

Definition at line 629 of file circbuf.c.

References JPEG_HEADER_SIZE.

Referenced by circbuf_all_open().

ssize_t jpeghead_read ( struct file *  file,
char *  buf,
size_t  count,
loff_t *  off 
)

Definition at line 697 of file circbuf.c.

References D, jpeg_header_sbuffer_ptr, JPEG_HEADER_SIZE, and printk.

Referenced by circbuf_all_read().

ssize_t jpeghead_write ( struct file *  file,
const char *  buf,
size_t  count,
loff_t *  off 
)

Definition at line 717 of file circbuf.c.

References D, jpeg_header_sbuffer_ptr, JPEG_HEADER_SIZE, and printk.

Referenced by circbuf_all_write().

Variable Documentation

unsigned long* ccam_dma_buf_ptr

Without "static" system hangs after "Uncompressing Linux...

Definition at line 157 of file circbuf.c.

Referenced by add_frame_params(), ext_fill_jpeg_mmap_desc_(), flush_par_cache(), x313_dma_forget_jpeg(), x313_dma_init(), x313_dma_reset_chain(), x313_DMA_size(), x313_dma_start(), X313_dma_update(), x313_JPEG_dump(), and x313_setDMABuffer().

wait_queue_head_t circbuf_wait_queue

====================================================================================== ! Wait queue for the processes waiting for a new frame to appear in the circular buffer !======================================================================================

Definition at line 167 of file circbuf.c.

Referenced by add_frame_params().

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