drivers/media/platform/soc_camera/soc_camera_platform.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Generic Platform Camera Driver
   4  *
   5  * Copyright (C) 2008 Magnus Damm
   6  * Based on mt9m001 driver,
   7  * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/slab.h>
  13 #include <linux/delay.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/videodev2.h>
  16 #include <media/v4l2-subdev.h>
  17 #include <media/soc_camera.h>
  18 #include <linux/platform_data/media/soc_camera_platform.h>
  19
  20 struct soc_camera_platform_priv {
  21         struct v4l2_subdev subdev;
  22 };
  23
  24 static struct soc_camera_platform_priv *get_priv(struct platform_device *pdev)
  25 {
  26         struct v4l2_subdev *subdev = platform_get_drvdata(pdev);
  27         return container_of(subdev, struct soc_camera_platform_priv, subdev);
  28 }
  29
  30 static int soc_camera_platform_s_stream(struct v4l2_subdev *sd, int enable)
  31 {
  32         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  33         return p->set_capture(p, enable);
  34 }
  35
  36 static int soc_camera_platform_fill_fmt(struct v4l2_subdev *sd,
  37                 struct v4l2_subdev_pad_config *cfg,
  38                 struct v4l2_subdev_format *format)
  39 {
  40         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  41         struct v4l2_mbus_framefmt *mf = &format->format;
  42
  43         mf->width       = p->format.width;
  44         mf->height      = p->format.height;
  45         mf->code        = p->format.code;
  46         mf->colorspace  = p->format.colorspace;
  47         mf->field       = p->format.field;
  48
  49         return 0;
  50 }
  51
  52 static int soc_camera_platform_s_power(struct v4l2_subdev *sd, int on)
  53 {
  54         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  55
  56         return soc_camera_set_power(p->icd->control, &p->icd->sdesc->subdev_desc, NULL, on);
  57 }
  58
  59 static const struct v4l2_subdev_core_ops platform_subdev_core_ops = {
  60         .s_power = soc_camera_platform_s_power,
  61 };
  62
  63 static int soc_camera_platform_enum_mbus_code(struct v4l2_subdev *sd,
  64                 struct v4l2_subdev_pad_config *cfg,
  65                 struct v4l2_subdev_mbus_code_enum *code)
  66 {
  67         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  68
  69         if (code->pad || code->index)
  70                 return -EINVAL;
  71
  72         code->code = p->format.code;
  73         return 0;
  74 }
  75
  76 static int soc_camera_platform_get_selection(struct v4l2_subdev *sd,
  77                 struct v4l2_subdev_pad_config *cfg,
  78                 struct v4l2_subdev_selection *sel)
  79 {
  80         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  81
  82         if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
  83                 return -EINVAL;
  84
  85         switch (sel->target) {
  86         case V4L2_SEL_TGT_CROP_BOUNDS:
  87         case V4L2_SEL_TGT_CROP_DEFAULT:
  88         case V4L2_SEL_TGT_CROP:
  89                 sel->r.left = 0;
  90                 sel->r.top = 0;
  91                 sel->r.width = p->format.width;
  92                 sel->r.height = p->format.height;
  93                 return 0;
  94         default:
  95                 return -EINVAL;
  96         }
  97 }
  98
  99 static int soc_camera_platform_g_mbus_config(struct v4l2_subdev *sd,
 100                                              struct v4l2_mbus_config *cfg)
 101 {
 102         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
 103
 104         cfg->flags = p->mbus_param;
 105         cfg->type = p->mbus_type;
 106
 107         return 0;
 108 }
 109
 110 static const struct v4l2_subdev_video_ops platform_subdev_video_ops = {
 111         .s_stream       = soc_camera_platform_s_stream,
 112         .g_mbus_config  = soc_camera_platform_g_mbus_config,
 113 };
 114
 115 static const struct v4l2_subdev_pad_ops platform_subdev_pad_ops = {
 116         .enum_mbus_code = soc_camera_platform_enum_mbus_code,
 117         .get_selection  = soc_camera_platform_get_selection,
 118         .get_fmt        = soc_camera_platform_fill_fmt,
 119         .set_fmt        = soc_camera_platform_fill_fmt,
 120 };
 121
 122 static const struct v4l2_subdev_ops platform_subdev_ops = {
 123         .core   = &platform_subdev_core_ops,
 124         .video  = &platform_subdev_video_ops,
 125         .pad    = &platform_subdev_pad_ops,
 126 };
 127
 128 static int soc_camera_platform_probe(struct platform_device *pdev)
 129 {
 130         struct soc_camera_host *ici;
 131         struct soc_camera_platform_priv *priv;
 132         struct soc_camera_platform_info *p = pdev->dev.platform_data;
 133         struct soc_camera_device *icd;
 134
 135         if (!p)
 136                 return -EINVAL;
 137
 138         if (!p->icd) {
 139                 dev_err(&pdev->dev,
 140                         "Platform has not set soc_camera_device pointer!\n");
 141                 return -EINVAL;
 142         }
 143
 144         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 145         if (!priv)
 146                 return -ENOMEM;
 147
 148         icd = p->icd;
 149
 150         /* soc-camera convention: control's drvdata points to the subdev */
 151         platform_set_drvdata(pdev, &priv->subdev);
 152         /* Set the control device reference */
 153         icd->control = &pdev->dev;
 154
 155         ici = to_soc_camera_host(icd->parent);
 156
 157         v4l2_subdev_init(&priv->subdev, &platform_subdev_ops);
 158         v4l2_set_subdevdata(&priv->subdev, p);
 159         strlcpy(priv->subdev.name, dev_name(&pdev->dev),
 160                 sizeof(priv->subdev.name));
 161
 162         return v4l2_device_register_subdev(&ici->v4l2_dev, &priv->subdev);
 163 }
 164
 165 static int soc_camera_platform_remove(struct platform_device *pdev)
 166 {
 167         struct soc_camera_platform_priv *priv = get_priv(pdev);
 168         struct soc_camera_platform_info *p = v4l2_get_subdevdata(&priv->subdev);
 169
 170         p->icd->control = NULL;
 171         v4l2_device_unregister_subdev(&priv->subdev);
 172         return 0;
 173 }
 174
 175 static struct platform_driver soc_camera_platform_driver = {
 176         .driver         = {
 177                 .name   = "soc_camera_platform",
 178         },
 179         .probe          = soc_camera_platform_probe,
 180         .remove         = soc_camera_platform_remove,
 181 };
 182
 183 module_platform_driver(soc_camera_platform_driver);
 184
 185 MODULE_DESCRIPTION("SoC Camera Platform driver");
 186 MODULE_AUTHOR("Magnus Damm");
 187 MODULE_LICENSE("GPL v2");
 188 MODULE_ALIAS("platform:soc_camera_platform");