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Linux/include/media/v4l2-fh.h

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  1 /*
  2  * v4l2-fh.h
  3  *
  4  * V4L2 file handle. Store per file handle data for the V4L2
  5  * framework. Using file handles is optional for the drivers.
  6  *
  7  * Copyright (C) 2009--2010 Nokia Corporation.
  8  *
  9  * Contact: Sakari Ailus <sakari.ailus@iki.fi>
 10  *
 11  * This program is free software; you can redistribute it and/or
 12  * modify it under the terms of the GNU General Public License
 13  * version 2 as published by the Free Software Foundation.
 14  *
 15  * This program is distributed in the hope that it will be useful, but
 16  * WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18  * General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public License
 21  * along with this program; if not, write to the Free Software
 22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 23  * 02110-1301 USA
 24  */
 25 
 26 #ifndef V4L2_FH_H
 27 #define V4L2_FH_H
 28 
 29 #include <linux/fs.h>
 30 #include <linux/list.h>
 31 #include <linux/videodev2.h>
 32 
 33 struct video_device;
 34 struct v4l2_ctrl_handler;
 35 
 36 struct v4l2_fh {
 37         struct list_head        list;
 38         struct video_device     *vdev;
 39         struct v4l2_ctrl_handler *ctrl_handler;
 40         enum v4l2_priority      prio;
 41 
 42         /* Events */
 43         wait_queue_head_t       wait;
 44         struct list_head        subscribed; /* Subscribed events */
 45         struct list_head        available; /* Dequeueable event */
 46         unsigned int            navailable;
 47         u32                     sequence;
 48 
 49 #if IS_ENABLED(CONFIG_V4L2_MEM2MEM_DEV)
 50         struct v4l2_m2m_ctx     *m2m_ctx;
 51 #endif
 52 };
 53 
 54 /*
 55  * Initialise the file handle. Parts of the V4L2 framework using the
 56  * file handles should be initialised in this function. Must be called
 57  * from driver's v4l2_file_operations->open() handler if the driver
 58  * uses v4l2_fh.
 59  */
 60 void v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev);
 61 /*
 62  * Add the fh to the list of file handles on a video_device. The file
 63  * handle must be initialised first.
 64  */
 65 void v4l2_fh_add(struct v4l2_fh *fh);
 66 /*
 67  * Can be used as the open() op of v4l2_file_operations.
 68  * It allocates a v4l2_fh and inits and adds it to the video_device associated
 69  * with the file pointer.
 70  */
 71 int v4l2_fh_open(struct file *filp);
 72 /*
 73  * Remove file handle from the list of file handles. Must be called in
 74  * v4l2_file_operations->release() handler if the driver uses v4l2_fh.
 75  * On error filp->private_data will be NULL, otherwise it will point to
 76  * the v4l2_fh struct.
 77  */
 78 void v4l2_fh_del(struct v4l2_fh *fh);
 79 /*
 80  * Release resources related to a file handle. Parts of the V4L2
 81  * framework using the v4l2_fh must release their resources here, too.
 82  * Must be called in v4l2_file_operations->release() handler if the
 83  * driver uses v4l2_fh.
 84  */
 85 void v4l2_fh_exit(struct v4l2_fh *fh);
 86 /*
 87  * Can be used as the release() op of v4l2_file_operations.
 88  * It deletes and exits the v4l2_fh associated with the file pointer and
 89  * frees it. It will do nothing if filp->private_data (the pointer to the
 90  * v4l2_fh struct) is NULL. This function always returns 0.
 91  */
 92 int v4l2_fh_release(struct file *filp);
 93 /*
 94  * Returns 1 if this filehandle is the only filehandle opened for the
 95  * associated video_device. If fh is NULL, then it returns 0.
 96  */
 97 int v4l2_fh_is_singular(struct v4l2_fh *fh);
 98 /*
 99  * Helper function with struct file as argument. If filp->private_data is
100  * NULL, then it will return 0.
101  */
102 static inline int v4l2_fh_is_singular_file(struct file *filp)
103 {
104         return v4l2_fh_is_singular(filp->private_data);
105 }
106 
107 #endif /* V4L2_EVENT_H */
108 

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