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