drivers/media/platform/soc_camera/soc_camera_platform.c

   1 /*
   2  * Generic Platform Camera Driver
   3  *
   4  * Copyright (C) 2008 Magnus Damm
   5  * Based on mt9m001 driver,
   6  * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
   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 version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/delay.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/videodev2.h>
  19 #include <media/v4l2-subdev.h>
  20 #include <media/soc_camera.h>
  21 #include <linux/platform_data/media/soc_camera_platform.h>
  22
  23 struct soc_camera_platform_priv {
  24         struct v4l2_subdev subdev;
  25 };
  26
  27 static struct soc_camera_platform_priv *get_priv(struct platform_device *pdev)
  28 {
  29         struct v4l2_subdev *subdev = platform_get_drvdata(pdev);
  30         return container_of(subdev, struct soc_camera_platform_priv, subdev);
  31 }
  32
  33 static int soc_camera_platform_s_stream(struct v4l2_subdev *sd, int enable)
  34 {
  35         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  36         return p->set_capture(p, enable);
  37 }
  38
  39 static int soc_camera_platform_fill_fmt(struct v4l2_subdev *sd,
  40                 struct v4l2_subdev_pad_config *cfg,
  41                 struct v4l2_subdev_format *format)
  42 {
  43         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  44         struct v4l2_mbus_framefmt *mf = &format->format;
  45
  46         mf->width       = p->format.width;
  47         mf->height      = p->format.height;
  48         mf->code        = p->format.code;
  49         mf->colorspace  = p->format.colorspace;
  50         mf->field       = p->format.field;
  51
  52         return 0;
  53 }
  54
  55 static int soc_camera_platform_s_power(struct v4l2_subdev *sd, int on)
  56 {
  57         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  58
  59         return soc_camera_set_power(p->icd->control, &p->icd->sdesc->subdev_desc, NULL, on);
  60 }
  61
  62 static const struct v4l2_subdev_core_ops platform_subdev_core_ops = {
  63         .s_power = soc_camera_platform_s_power,
  64 };
  65
  66 static int soc_camera_platform_enum_mbus_code(struct v4l2_subdev *sd,
  67                 struct v4l2_subdev_pad_config *cfg,
  68                 struct v4l2_subdev_mbus_code_enum *code)
  69 {
  70         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  71
  72         if (code->pad || code->index)
  73                 return -EINVAL;
  74
  75         code->code = p->format.code;
  76         return 0;
  77 }
  78
  79 static int soc_camera_platform_get_selection(struct v4l2_subdev *sd,
  80                 struct v4l2_subdev_pad_config *cfg,
  81                 struct v4l2_subdev_selection *sel)
  82 {
  83         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  84
  85         if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
  86                 return -EINVAL;
  87
  88         switch (sel->target) {
  89         case V4L2_SEL_TGT_CROP_BOUNDS:
  90         case V4L2_SEL_TGT_CROP_DEFAULT:
  91         case V4L2_SEL_TGT_CROP:
  92                 sel->r.left = 0;
  93                 sel->r.top = 0;
  94                 sel->r.width = p->format.width;
  95                 sel->r.height = p->format.height;
  96                 return 0;
  97         default:
  98                 return -EINVAL;
  99         }
 100 }
 101
 102 static int soc_camera_platform_g_mbus_config(struct v4l2_subdev *sd,
 103                                              struct v4l2_mbus_config *cfg)
 104 {
 105         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
 106
 107         cfg->flags = p->mbus_param;
 108         cfg->type = p->mbus_type;
 109
 110         return 0;
 111 }
 112
 113 static const struct v4l2_subdev_video_ops platform_subdev_video_ops = {
 114         .s_stream       = soc_camera_platform_s_stream,
 115         .g_mbus_config  = soc_camera_platform_g_mbus_config,
 116 };
 117
 118 static const struct v4l2_subdev_pad_ops platform_subdev_pad_ops = {
 119         .enum_mbus_code = soc_camera_platform_enum_mbus_code,
 120         .get_selection  = soc_camera_platform_get_selection,
 121         .get_fmt        = soc_camera_platform_fill_fmt,
 122         .set_fmt        = soc_camera_platform_fill_fmt,
 123 };
 124
 125 static const struct v4l2_subdev_ops platform_subdev_ops = {
 126         .core   = &platform_subdev_core_ops,
 127         .video  = &platform_subdev_video_ops,
 128         .pad    = &platform_subdev_pad_ops,
 129 };
 130
 131 static int soc_camera_platform_probe(struct platform_device *pdev)
 132 {
 133         struct soc_camera_host *ici;
 134         struct soc_camera_platform_priv *priv;
 135         struct soc_camera_platform_info *p = pdev->dev.platform_data;
 136         struct soc_camera_device *icd;
 137
 138         if (!p)
 139                 return -EINVAL;
 140
 141         if (!p->icd) {
 142                 dev_err(&pdev->dev,
 143                         "Platform has not set soc_camera_device pointer!\n");
 144                 return -EINVAL;
 145         }
 146
 147         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 148         if (!priv)
 149                 return -ENOMEM;
 150
 151         icd = p->icd;
 152
 153         /* soc-camera convention: control's drvdata points to the subdev */
 154         platform_set_drvdata(pdev, &priv->subdev);
 155         /* Set the control device reference */
 156         icd->control = &pdev->dev;
 157
 158         ici = to_soc_camera_host(icd->parent);
 159
 160         v4l2_subdev_init(&priv->subdev, &platform_subdev_ops);
 161         v4l2_set_subdevdata(&priv->subdev, p);
 162         strncpy(priv->subdev.name, dev_name(&pdev->dev), V4L2_SUBDEV_NAME_SIZE);
 163
 164         return v4l2_device_register_subdev(&ici->v4l2_dev, &priv->subdev);
 165 }
 166
 167 static int soc_camera_platform_remove(struct platform_device *pdev)
 168 {
 169         struct soc_camera_platform_priv *priv = get_priv(pdev);
 170         struct soc_camera_platform_info *p = v4l2_get_subdevdata(&priv->subdev);
 171
 172         p->icd->control = NULL;
 173         v4l2_device_unregister_subdev(&priv->subdev);
 174         return 0;
 175 }
 176
 177 static struct platform_driver soc_camera_platform_driver = {
 178         .driver         = {
 179                 .name   = "soc_camera_platform",
 180         },
 181         .probe          = soc_camera_platform_probe,
 182         .remove         = soc_camera_platform_remove,
 183 };
 184
 185 module_platform_driver(soc_camera_platform_driver);
 186
 187 MODULE_DESCRIPTION("SoC Camera Platform driver");
 188 MODULE_AUTHOR("Magnus Damm");
 189 MODULE_LICENSE("GPL v2");
 190 MODULE_ALIAS("platform:soc_camera_platform");