drivers/media/video/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 <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_mbus_framefmt *mf)
  41 {
  42         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  43
  44         mf->width       = p->format.width;
  45         mf->height      = p->format.height;
  46         mf->code        = p->format.code;
  47         mf->colorspace  = p->format.colorspace;
  48         mf->field       = p->format.field;
  49
  50         return 0;
  51 }
  52
  53 static struct v4l2_subdev_core_ops platform_subdev_core_ops;
  54
  55 static int soc_camera_platform_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
  56                                         enum v4l2_mbus_pixelcode *code)
  57 {
  58         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  59
  60         if (index)
  61                 return -EINVAL;
  62
  63         *code = p->format.code;
  64         return 0;
  65 }
  66
  67 static int soc_camera_platform_g_crop(struct v4l2_subdev *sd,
  68                                       struct v4l2_crop *a)
  69 {
  70         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  71
  72         a->c.left       = 0;
  73         a->c.top        = 0;
  74         a->c.width      = p->format.width;
  75         a->c.height     = p->format.height;
  76         a->type         = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  77
  78         return 0;
  79 }
  80
  81 static int soc_camera_platform_cropcap(struct v4l2_subdev *sd,
  82                                        struct v4l2_cropcap *a)
  83 {
  84         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  85
  86         a->bounds.left                  = 0;
  87         a->bounds.top                   = 0;
  88         a->bounds.width                 = p->format.width;
  89         a->bounds.height                = p->format.height;
  90         a->defrect                      = a->bounds;
  91         a->type                         = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  92         a->pixelaspect.numerator        = 1;
  93         a->pixelaspect.denominator      = 1;
  94
  95         return 0;
  96 }
  97
  98 static int soc_camera_platform_g_mbus_config(struct v4l2_subdev *sd,
  99                                              struct v4l2_mbus_config *cfg)
 100 {
 101         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
 102
 103         cfg->flags = p->mbus_param;
 104         cfg->type = p->mbus_type;
 105
 106         return 0;
 107 }
 108
 109 static struct v4l2_subdev_video_ops platform_subdev_video_ops = {
 110         .s_stream       = soc_camera_platform_s_stream,
 111         .enum_mbus_fmt  = soc_camera_platform_enum_fmt,
 112         .cropcap        = soc_camera_platform_cropcap,
 113         .g_crop         = soc_camera_platform_g_crop,
 114         .try_mbus_fmt   = soc_camera_platform_fill_fmt,
 115         .g_mbus_fmt     = soc_camera_platform_fill_fmt,
 116         .s_mbus_fmt     = soc_camera_platform_fill_fmt,
 117         .g_mbus_config  = soc_camera_platform_g_mbus_config,
 118 };
 119
 120 static struct v4l2_subdev_ops platform_subdev_ops = {
 121         .core   = &platform_subdev_core_ops,
 122         .video  = &platform_subdev_video_ops,
 123 };
 124
 125 static int soc_camera_platform_probe(struct platform_device *pdev)
 126 {
 127         struct soc_camera_host *ici;
 128         struct soc_camera_platform_priv *priv;
 129         struct soc_camera_platform_info *p = pdev->dev.platform_data;
 130         struct soc_camera_device *icd;
 131         int ret;
 132
 133         if (!p)
 134                 return -EINVAL;
 135
 136         if (!p->icd) {
 137                 dev_err(&pdev->dev,
 138                         "Platform has not set soc_camera_device pointer!\n");
 139                 return -EINVAL;
 140         }
 141
 142         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 143         if (!priv)
 144                 return -ENOMEM;
 145
 146         icd = p->icd;
 147
 148         /* soc-camera convention: control's drvdata points to the subdev */
 149         platform_set_drvdata(pdev, &priv->subdev);
 150         /* Set the control device reference */
 151         icd->control = &pdev->dev;
 152
 153         ici = to_soc_camera_host(icd->parent);
 154
 155         v4l2_subdev_init(&priv->subdev, &platform_subdev_ops);
 156         v4l2_set_subdevdata(&priv->subdev, p);
 157         strncpy(priv->subdev.name, dev_name(&pdev->dev), V4L2_SUBDEV_NAME_SIZE);
 158
 159         ret = v4l2_device_register_subdev(&ici->v4l2_dev, &priv->subdev);
 160         if (ret)
 161                 goto evdrs;
 162
 163         return ret;
 164
 165 evdrs:
 166         platform_set_drvdata(pdev, NULL);
 167         kfree(priv);
 168         return ret;
 169 }
 170
 171 static int soc_camera_platform_remove(struct platform_device *pdev)
 172 {
 173         struct soc_camera_platform_priv *priv = get_priv(pdev);
 174         struct soc_camera_platform_info *p = v4l2_get_subdevdata(&priv->subdev);
 175
 176         p->icd->control = NULL;
 177         v4l2_device_unregister_subdev(&priv->subdev);
 178         platform_set_drvdata(pdev, NULL);
 179         kfree(priv);
 180         return 0;
 181 }
 182
 183 static struct platform_driver soc_camera_platform_driver = {
 184         .driver         = {
 185                 .name   = "soc_camera_platform",
 186                 .owner  = THIS_MODULE,
 187         },
 188         .probe          = soc_camera_platform_probe,
 189         .remove         = soc_camera_platform_remove,
 190 };
 191
 192 module_platform_driver(soc_camera_platform_driver);
 193
 194 MODULE_DESCRIPTION("SoC Camera Platform driver");
 195 MODULE_AUTHOR("Magnus Damm");
 196 MODULE_LICENSE("GPL v2");
 197 MODULE_ALIAS("platform:soc_camera_platform");