mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 23:53:55 +08:00
8c5dff9057
Update contact information to correspond my e-mail address changes. Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
/*
|
|
* v4l2-fh.h
|
|
*
|
|
* V4L2 file handle. Store per file handle data for the V4L2
|
|
* framework. Using file handles is optional for the drivers.
|
|
*
|
|
* Copyright (C) 2009--2010 Nokia Corporation.
|
|
*
|
|
* Contact: Sakari Ailus <sakari.ailus@iki.fi>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* version 2 as published by the Free Software Foundation.
|
|
*
|
|
* 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., 51 Franklin St, Fifth Floor, Boston, MA
|
|
* 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef V4L2_FH_H
|
|
#define V4L2_FH_H
|
|
|
|
#include <linux/list.h>
|
|
|
|
struct video_device;
|
|
struct v4l2_ctrl_handler;
|
|
|
|
struct v4l2_fh {
|
|
struct list_head list;
|
|
struct video_device *vdev;
|
|
struct v4l2_ctrl_handler *ctrl_handler;
|
|
enum v4l2_priority prio;
|
|
|
|
/* Events */
|
|
wait_queue_head_t wait;
|
|
struct list_head subscribed; /* Subscribed events */
|
|
struct list_head available; /* Dequeueable event */
|
|
unsigned int navailable;
|
|
u32 sequence;
|
|
};
|
|
|
|
/*
|
|
* Initialise the file handle. Parts of the V4L2 framework using the
|
|
* file handles should be initialised in this function. Must be called
|
|
* from driver's v4l2_file_operations->open() handler if the driver
|
|
* uses v4l2_fh.
|
|
*/
|
|
void v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev);
|
|
/*
|
|
* Add the fh to the list of file handles on a video_device. The file
|
|
* handle must be initialised first.
|
|
*/
|
|
void v4l2_fh_add(struct v4l2_fh *fh);
|
|
/*
|
|
* Can be used as the open() op of v4l2_file_operations.
|
|
* It allocates a v4l2_fh and inits and adds it to the video_device associated
|
|
* with the file pointer.
|
|
*/
|
|
int v4l2_fh_open(struct file *filp);
|
|
/*
|
|
* Remove file handle from the list of file handles. Must be called in
|
|
* v4l2_file_operations->release() handler if the driver uses v4l2_fh.
|
|
* On error filp->private_data will be NULL, otherwise it will point to
|
|
* the v4l2_fh struct.
|
|
*/
|
|
void v4l2_fh_del(struct v4l2_fh *fh);
|
|
/*
|
|
* Release resources related to a file handle. Parts of the V4L2
|
|
* framework using the v4l2_fh must release their resources here, too.
|
|
* Must be called in v4l2_file_operations->release() handler if the
|
|
* driver uses v4l2_fh.
|
|
*/
|
|
void v4l2_fh_exit(struct v4l2_fh *fh);
|
|
/*
|
|
* Can be used as the release() op of v4l2_file_operations.
|
|
* It deletes and exits the v4l2_fh associated with the file pointer and
|
|
* frees it. It will do nothing if filp->private_data (the pointer to the
|
|
* v4l2_fh struct) is NULL. This function always returns 0.
|
|
*/
|
|
int v4l2_fh_release(struct file *filp);
|
|
/*
|
|
* Returns 1 if this filehandle is the only filehandle opened for the
|
|
* associated video_device. If fh is NULL, then it returns 0.
|
|
*/
|
|
int v4l2_fh_is_singular(struct v4l2_fh *fh);
|
|
/*
|
|
* Helper function with struct file as argument. If filp->private_data is
|
|
* NULL, then it will return 0.
|
|
*/
|
|
static inline int v4l2_fh_is_singular_file(struct file *filp)
|
|
{
|
|
return v4l2_fh_is_singular(filp->private_data);
|
|
}
|
|
|
|
#endif /* V4L2_EVENT_H */
|