drivers/media/platform/vsp1/vsp1_histo.h

   1 /*
   2  * vsp1_histo.h  --  R-Car VSP1 Histogram API
   3  *
   4  * Copyright (C) 2016 Renesas Electronics Corporation
   5  * Copyright (C) 2016 Laurent Pinchart
   6  *
   7  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  */
  14 #ifndef __VSP1_HISTO_H__
  15 #define __VSP1_HISTO_H__
  16
  17 #include <linux/list.h>
  18 #include <linux/mutex.h>
  19 #include <linux/spinlock.h>
  20
  21 #include <media/media-entity.h>
  22 #include <media/v4l2-dev.h>
  23 #include <media/videobuf2-v4l2.h>
  24
  25 #include "vsp1_entity.h"
  26
  27 struct vsp1_device;
  28 struct vsp1_pipeline;
  29
  30 #define HISTO_PAD_SINK                          0
  31 #define HISTO_PAD_SOURCE                        1
  32
  33 struct vsp1_histogram_buffer {
  34         struct vb2_v4l2_buffer buf;
  35         struct list_head queue;
  36         void *addr;
  37 };
  38
  39 struct vsp1_histogram {
  40         struct vsp1_pipeline *pipe;
  41
  42         struct vsp1_entity entity;
  43         struct video_device video;
  44         struct media_pad pad;
  45
  46         const u32 *formats;
  47         unsigned int num_formats;
  48         size_t data_size;
  49         u32 meta_format;
  50
  51         struct mutex lock;
  52         struct vb2_queue queue;
  53
  54         spinlock_t irqlock;
  55         struct list_head irqqueue;
  56
  57         wait_queue_head_t wait_queue;
  58         bool readout;
  59 };
  60
  61 static inline struct vsp1_histogram *vdev_to_histo(struct video_device *vdev)
  62 {
  63         return container_of(vdev, struct vsp1_histogram, video);
  64 }
  65
  66 static inline struct vsp1_histogram *subdev_to_histo(struct v4l2_subdev *subdev)
  67 {
  68         return container_of(subdev, struct vsp1_histogram, entity.subdev);
  69 }
  70
  71 int vsp1_histogram_init(struct vsp1_device *vsp1, struct vsp1_histogram *histo,
  72                         enum vsp1_entity_type type, const char *name,
  73                         const struct vsp1_entity_operations *ops,
  74                         const unsigned int *formats, unsigned int num_formats,
  75                         size_t data_size, u32 meta_format);
  76 void vsp1_histogram_destroy(struct vsp1_entity *entity);
  77
  78 struct vsp1_histogram_buffer *
  79 vsp1_histogram_buffer_get(struct vsp1_histogram *histo);
  80 void vsp1_histogram_buffer_complete(struct vsp1_histogram *histo,
  81                                     struct vsp1_histogram_buffer *buf,
  82                                     size_t size);
  83
  84 #endif /* __VSP1_HISTO_H__ */