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107 lines
3.4 KiB
107 lines
3.4 KiB
/* |
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* v4l2-fh.h |
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* |
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* V4L2 file handle. Store per file handle data for the V4L2 |
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* framework. Using file handles is optional for the drivers. |
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* |
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* Copyright (C) 2009--2010 Nokia Corporation. |
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* |
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* Contact: Sakari Ailus <sakari.ailus@iki.fi> |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* version 2 as published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
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* 02110-1301 USA |
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*/ |
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#ifndef V4L2_FH_H |
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#define V4L2_FH_H |
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#include <linux/fs.h> |
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#include <linux/list.h> |
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#include <linux/videodev2.h> |
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struct video_device; |
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struct v4l2_ctrl_handler; |
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struct v4l2_fh { |
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struct list_head list; |
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struct video_device *vdev; |
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struct v4l2_ctrl_handler *ctrl_handler; |
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enum v4l2_priority prio; |
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/* Events */ |
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wait_queue_head_t wait; |
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struct list_head subscribed; /* Subscribed events */ |
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struct list_head available; /* Dequeueable event */ |
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unsigned int navailable; |
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u32 sequence; |
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#if IS_ENABLED(CONFIG_V4L2_MEM2MEM_DEV) |
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struct v4l2_m2m_ctx *m2m_ctx; |
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#endif |
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}; |
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/* |
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* Initialise the file handle. Parts of the V4L2 framework using the |
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* file handles should be initialised in this function. Must be called |
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* from driver's v4l2_file_operations->open() handler if the driver |
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* uses v4l2_fh. |
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*/ |
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void v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev); |
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/* |
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* Add the fh to the list of file handles on a video_device. The file |
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* handle must be initialised first. |
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*/ |
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void v4l2_fh_add(struct v4l2_fh *fh); |
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/* |
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* Can be used as the open() op of v4l2_file_operations. |
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* It allocates a v4l2_fh and inits and adds it to the video_device associated |
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* with the file pointer. |
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*/ |
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int v4l2_fh_open(struct file *filp); |
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/* |
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* Remove file handle from the list of file handles. Must be called in |
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* v4l2_file_operations->release() handler if the driver uses v4l2_fh. |
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* On error filp->private_data will be NULL, otherwise it will point to |
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* the v4l2_fh struct. |
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*/ |
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void v4l2_fh_del(struct v4l2_fh *fh); |
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/* |
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* Release resources related to a file handle. Parts of the V4L2 |
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* framework using the v4l2_fh must release their resources here, too. |
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* Must be called in v4l2_file_operations->release() handler if the |
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* driver uses v4l2_fh. |
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*/ |
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void v4l2_fh_exit(struct v4l2_fh *fh); |
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/* |
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* Can be used as the release() op of v4l2_file_operations. |
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* It deletes and exits the v4l2_fh associated with the file pointer and |
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* frees it. It will do nothing if filp->private_data (the pointer to the |
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* v4l2_fh struct) is NULL. This function always returns 0. |
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*/ |
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int v4l2_fh_release(struct file *filp); |
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/* |
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* Returns 1 if this filehandle is the only filehandle opened for the |
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* associated video_device. If fh is NULL, then it returns 0. |
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*/ |
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int v4l2_fh_is_singular(struct v4l2_fh *fh); |
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/* |
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* Helper function with struct file as argument. If filp->private_data is |
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* NULL, then it will return 0. |
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*/ |
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static inline int v4l2_fh_is_singular_file(struct file *filp) |
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{ |
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return v4l2_fh_is_singular(filp->private_data); |
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} |
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#endif /* V4L2_EVENT_H */
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