linux/drivers/mxc/ipu/pf/mxc_pf.c File Reference

MXC IPU MPEG4/H.264 Post-filtering driver. More...

Functions
static int	mxc_pf_init (pf_init_params *pf_init)
static int	mxc_pf_uninit (void)
static int	mxc_pf_reqbufs (pf_reqbufs_params *reqbufs)
static int	mxc_pf_start (pf_buf *in, pf_buf *out, int qp_buf)
static int	mxc_pf_open (struct inode *inode, struct file *filp)
static int	mxc_pf_release (struct inode *inode, struct file *filp)
static int	mxc_pf_ioctl (struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
static int	mxc_pf_mmap (struct file *file, struct vm_area_struct *vma)
int	mxc_pf_fsync (struct file *filp, struct dentry *dentry, int datasync)
static unsigned int	mxc_pf_poll (struct file *file, poll_table *wait)
int	mxc_pf_dev_init (void)
static void	mxc_pf_exit (void)
Variables
static struct file_operations	mxc_pf_fops

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Detailed Description

MXC IPU MPEG4/H.264 Post-filtering driver.

User-level API for IPU Hardware MPEG4/H.264 Post-filtering.

---

Function Documentation

int mxc_pf_dev_init

(

void

)

Post Filter driver module initialization function.

static void mxc_pf_exit

(

void

)

[static]

Post Filter driver module exit function.

int mxc_pf_fsync	(	struct file *	filp,
		struct dentry *	dentry,
		int	datasync
	)

Post Filter driver fsync function. This function implements the Linux file_operations.fsync() API function.

The user must call fsync() before reading an output buffer. This call flushes the L1 and L2 caches

Parameters:

	filp	structure file *
	dentry	struct dentry *
	datasync	unused

Returns:

status POLLIN | POLLRDNORM

static int mxc_pf_init

(

pf_init_params *

pf_init

)

[static]

This function handles PF_IOCTL_INIT calls. It initializes the PF channels, interrupt handlers, and channel buffers.

Returns:

This function returns 0 on success or negative error code on error.

References pf_init_params::height, pf_init_params::pf_mode, pf_init_params::stride, and pf_init_params::width.

Referenced by mxc_pf_ioctl().

static int mxc_pf_ioctl	(	struct inode *	inode,
		struct file *	filp,
		unsigned int	cmd,
		unsigned long	arg
	)			[static]

Post Filter driver ioctl function. This function implements the Linux file_operations.ioctl() API function.

Parameters:

	inode	struct inode *
	filp	struct file *
	cmd	IOCTL command to handle
	arg	Pointer to arguments for IOCTL

Returns:

This function returns 0 on success or negative error code on error.

References pf_start_params::h264_pause_row, pf_start_params::in, mxc_pf_init(), mxc_pf_reqbufs(), mxc_pf_start(), mxc_pf_uninit(), pf_buf::offset, and pf_start_params::out.

static int mxc_pf_mmap	(	struct file *	file,
		struct vm_area_struct *	vma
	)			[static]

Post Filter driver mmap function. This function implements the Linux file_operations.mmap() API function for mapping driver buffers to user space.

Parameters:

	file	struct file *
	vma	structure vm_area_struct *

Returns:

0 Success, EINTR busy lock error, ENOBUFS remap_page error.

static int mxc_pf_open	(	struct inode *	inode,
		struct file *	filp
	)			[static]

Post Filter driver open function. This function implements the Linux file_operations.open() API function.

Parameters:

	inode	struct inode *
	filp	struct file *

Returns:

This function returns 0 on success or negative error code on error.

static unsigned int mxc_pf_poll	(	struct file *	file,
		poll_table *	wait
	)			[static]

Post Filter driver poll function. This function implements the Linux file_operations.poll() API function.

Parameters:

	file	structure file *
	wait	structure poll_table *

Returns:

status POLLIN | POLLRDNORM

static int mxc_pf_release	(	struct inode *	inode,
		struct file *	filp
	)			[static]

Post Filter driver release function. This function implements the Linux file_operations.release() API function.

Parameters:

	inode	struct inode *
	filp	struct file *

Returns:

This function returns 0 on success or negative error code on error.

References pf_reqbufs_params::count, mxc_pf_reqbufs(), and mxc_pf_uninit().

static int mxc_pf_reqbufs

(

pf_reqbufs_params *

reqbufs

)

[static]

This function handles PF_IOCTL_REQBUFS calls. It initializes the PF channels and channel buffers.

Parameters:

reqbufs

Input/Output Structure containing buffer mode, type, offset, and size. The offset and size of the buffer are returned for PF_MEMORY_MMAP mode.

Returns:

This function returns 0 on success or negative error code on error.

References pf_reqbufs_params::count, pf_buf::offset, and pf_buf::size.

Referenced by mxc_pf_ioctl(), and mxc_pf_release().

static int mxc_pf_start	(	pf_buf *	in,
		pf_buf *	out,
		int	qp_buf
	)			[static]

This function handles PF_IOCTL_START calls. It sets the PF channel buffers addresses and starts the channels

Returns:

This function returns 0 on success or negative error code on error.

References pf_buf::offset, pf_buf::u_offset, pf_buf::v_offset, and pf_buf::y_offset.

Referenced by mxc_pf_ioctl().

static int mxc_pf_uninit

(

void

)

[static]

This function handles PF_IOCTL_UNINIT calls. It uninitializes the PF channels and interrupt handlers.

Returns:

This function returns 0 on success or negative error code on error.

Referenced by mxc_pf_ioctl(), and mxc_pf_release().

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Variable Documentation

struct file_operations mxc_pf_fops [static]

Initial value:

 {
        .owner = THIS_MODULE,
        .open = mxc_pf_open,
        .release = mxc_pf_release,
        .ioctl = mxc_pf_ioctl,
        .poll = mxc_pf_poll,
        .mmap = mxc_pf_mmap,
        .fsync = mxc_pf_fsync,
}

File operation structure functions pointers.