drivers/media/platform/vsp1/vsp1_entity.c

   1 /*
   2  * vsp1_entity.c  --  R-Car VSP1 Base Entity
   3  *
   4  * Copyright (C) 2013 Renesas Corporation
   5  *
   6  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/device.h>
  15 #include <linux/gfp.h>
  16
  17 #include <media/media-entity.h>
  18 #include <media/v4l2-subdev.h>
  19
  20 #include "vsp1.h"
  21 #include "vsp1_entity.h"
  22
  23 /* -----------------------------------------------------------------------------
  24  * V4L2 Subdevice Operations
  25  */
  26
  27 struct v4l2_mbus_framefmt *
  28 vsp1_entity_get_pad_format(struct vsp1_entity *entity,
  29                            struct v4l2_subdev_fh *fh,
  30                            unsigned int pad, u32 which)
  31 {
  32         switch (which) {
  33         case V4L2_SUBDEV_FORMAT_TRY:
  34                 return v4l2_subdev_get_try_format(fh, pad);
  35         case V4L2_SUBDEV_FORMAT_ACTIVE:
  36                 return &entity->formats[pad];
  37         default:
  38                 return NULL;
  39         }
  40 }
  41
  42 /*
  43  * vsp1_entity_init_formats - Initialize formats on all pads
  44  * @subdev: V4L2 subdevice
  45  * @fh: V4L2 subdev file handle
  46  *
  47  * Initialize all pad formats with default values. If fh is not NULL, try
  48  * formats are initialized on the file handle. Otherwise active formats are
  49  * initialized on the device.
  50  */
  51 void vsp1_entity_init_formats(struct v4l2_subdev *subdev,
  52                             struct v4l2_subdev_fh *fh)
  53 {
  54         struct v4l2_subdev_format format;
  55         unsigned int pad;
  56
  57         for (pad = 0; pad < subdev->entity.num_pads - 1; ++pad) {
  58                 memset(&format, 0, sizeof(format));
  59
  60                 format.pad = pad;
  61                 format.which = fh ? V4L2_SUBDEV_FORMAT_TRY
  62                              : V4L2_SUBDEV_FORMAT_ACTIVE;
  63
  64                 v4l2_subdev_call(subdev, pad, set_fmt, fh, &format);
  65         }
  66 }
  67
  68 static int vsp1_entity_open(struct v4l2_subdev *subdev,
  69                             struct v4l2_subdev_fh *fh)
  70 {
  71         vsp1_entity_init_formats(subdev, fh);
  72
  73         return 0;
  74 }
  75
  76 const struct v4l2_subdev_internal_ops vsp1_subdev_internal_ops = {
  77         .open = vsp1_entity_open,
  78 };
  79
  80 /* -----------------------------------------------------------------------------
  81  * Media Operations
  82  */
  83
  84 static int vsp1_entity_link_setup(struct media_entity *entity,
  85                                   const struct media_pad *local,
  86                                   const struct media_pad *remote, u32 flags)
  87 {
  88         struct vsp1_entity *source;
  89
  90         if (!(local->flags & MEDIA_PAD_FL_SOURCE))
  91                 return 0;
  92
  93         source = container_of(local->entity, struct vsp1_entity, subdev.entity);
  94
  95         if (!source->route)
  96                 return 0;
  97
  98         if (flags & MEDIA_LNK_FL_ENABLED) {
  99                 if (source->sink)
 100                         return -EBUSY;
 101                 source->sink = remote->entity;
 102         } else {
 103                 source->sink = NULL;
 104         }
 105
 106         return 0;
 107 }
 108
 109 const struct media_entity_operations vsp1_media_ops = {
 110         .link_setup = vsp1_entity_link_setup,
 111         .link_validate = v4l2_subdev_link_validate,
 112 };
 113
 114 /* -----------------------------------------------------------------------------
 115  * Initialization
 116  */
 117
 118 int vsp1_entity_init(struct vsp1_device *vsp1, struct vsp1_entity *entity,
 119                      unsigned int num_pads)
 120 {
 121         static const struct {
 122                 unsigned int id;
 123                 unsigned int reg;
 124         } routes[] = {
 125                 { VI6_DPR_NODE_LIF, 0 },
 126                 { VI6_DPR_NODE_RPF(0), VI6_DPR_RPF_ROUTE(0) },
 127                 { VI6_DPR_NODE_RPF(1), VI6_DPR_RPF_ROUTE(1) },
 128                 { VI6_DPR_NODE_RPF(2), VI6_DPR_RPF_ROUTE(2) },
 129                 { VI6_DPR_NODE_RPF(3), VI6_DPR_RPF_ROUTE(3) },
 130                 { VI6_DPR_NODE_RPF(4), VI6_DPR_RPF_ROUTE(4) },
 131                 { VI6_DPR_NODE_UDS(0), VI6_DPR_UDS_ROUTE(0) },
 132                 { VI6_DPR_NODE_UDS(1), VI6_DPR_UDS_ROUTE(1) },
 133                 { VI6_DPR_NODE_UDS(2), VI6_DPR_UDS_ROUTE(2) },
 134                 { VI6_DPR_NODE_WPF(0), 0 },
 135                 { VI6_DPR_NODE_WPF(1), 0 },
 136                 { VI6_DPR_NODE_WPF(2), 0 },
 137                 { VI6_DPR_NODE_WPF(3), 0 },
 138         };
 139
 140         unsigned int i;
 141
 142         for (i = 0; i < ARRAY_SIZE(routes); ++i) {
 143                 if (routes[i].id == entity->id) {
 144                         entity->route = routes[i].reg;
 145                         break;
 146                 }
 147         }
 148
 149         if (i == ARRAY_SIZE(routes))
 150                 return -EINVAL;
 151
 152         entity->vsp1 = vsp1;
 153         entity->source_pad = num_pads - 1;
 154
 155         /* Allocate formats and pads. */
 156         entity->formats = devm_kzalloc(vsp1->dev,
 157                                        num_pads * sizeof(*entity->formats),
 158                                        GFP_KERNEL);
 159         if (entity->formats == NULL)
 160                 return -ENOMEM;
 161
 162         entity->pads = devm_kzalloc(vsp1->dev, num_pads * sizeof(*entity->pads),
 163                                     GFP_KERNEL);
 164         if (entity->pads == NULL)
 165                 return -ENOMEM;
 166
 167         /* Initialize pads. */
 168         for (i = 0; i < num_pads - 1; ++i)
 169                 entity->pads[i].flags = MEDIA_PAD_FL_SINK;
 170
 171         entity->pads[num_pads - 1].flags = MEDIA_PAD_FL_SOURCE;
 172
 173         /* Initialize the media entity. */
 174         return media_entity_init(&entity->subdev.entity, num_pads,
 175                                  entity->pads, 0);
 176 }
 177
 178 void vsp1_entity_destroy(struct vsp1_entity *entity)
 179 {
 180         media_entity_cleanup(&entity->subdev.entity);
 181 }