diff options
Diffstat (limited to 'include/media/v4l2-fh.h')
| -rw-r--r-- | include/media/v4l2-fh.h | 50 |
1 files changed, 46 insertions, 4 deletions
diff --git a/include/media/v4l2-fh.h b/include/media/v4l2-fh.h index 1d72dde320b..80351677516 100644 --- a/include/media/v4l2-fh.h +++ b/include/media/v4l2-fh.h @@ -6,7 +6,7 @@ * * Copyright (C) 2009--2010 Nokia Corporation. * - * Contact: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com> + * 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 @@ -26,15 +26,29 @@ #ifndef V4L2_FH_H #define V4L2_FH_H +#include <linux/fs.h> #include <linux/list.h> +#include <linux/videodev2.h> struct video_device; -struct v4l2_events; +struct v4l2_ctrl_handler; struct v4l2_fh { struct list_head list; struct video_device *vdev; - struct v4l2_events *events; /* events, pending and subscribed */ + 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; + +#if IS_ENABLED(CONFIG_V4L2_MEM2MEM_DEV) + struct v4l2_m2m_ctx *m2m_ctx; +#endif }; /* @@ -43,15 +57,23 @@ struct v4l2_fh { * from driver's v4l2_file_operations->open() handler if the driver * uses v4l2_fh. */ -int v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev); +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); /* @@ -61,5 +83,25 @@ void v4l2_fh_del(struct v4l2_fh *fh); * 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 */ |