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 struct soc_camera_platform_info *get_info(struct soc_camera_device *icd)
  34 {
  35         struct platform_device *pdev =
  36                 to_platform_device(to_soc_camera_control(icd));
  37         return pdev->dev.platform_data;
  38 }
  39
  40 static int soc_camera_platform_s_stream(struct v4l2_subdev *sd, int enable)
  41 {
  42         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  43         return p->set_capture(p, enable);
  44 }
  45
  46 static int soc_camera_platform_set_bus_param(struct soc_camera_device *icd,
  47                                              unsigned long flags)
  48 {
  49         return 0;
  50 }
  51
  52 static unsigned long
  53 soc_camera_platform_query_bus_param(struct soc_camera_device *icd)
  54 {
  55         struct soc_camera_platform_info *p = get_info(icd);
  56         return p->bus_param;
  57 }
  58
  59 static int soc_camera_platform_fill_fmt(struct v4l2_subdev *sd,
  60                                         struct v4l2_mbus_framefmt *mf)
  61 {
  62         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  63
  64         mf->width       = p->format.width;
  65         mf->height      = p->format.height;
  66         mf->code        = p->format.code;
  67         mf->colorspace  = p->format.colorspace;
  68         mf->field       = p->format.field;
  69
  70         return 0;
  71 }
  72
  73 static struct v4l2_subdev_core_ops platform_subdev_core_ops;
  74
  75 static int soc_camera_platform_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
  76                                         enum v4l2_mbus_pixelcode *code)
  77 {
  78         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  79
  80         if (index)
  81                 return -EINVAL;
  82
  83         *code = p->format.code;
  84         return 0;
  85 }
  86
  87 static int soc_camera_platform_g_crop(struct v4l2_subdev *sd,
  88                                       struct v4l2_crop *a)
  89 {
  90         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  91
  92         a->c.left       = 0;
  93         a->c.top        = 0;
  94         a->c.width      = p->format.width;
  95         a->c.height     = p->format.height;
  96         a->type         = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  97
  98         return 0;
  99 }
 100
 101 static int soc_camera_platform_cropcap(struct v4l2_subdev *sd,
 102                                        struct v4l2_cropcap *a)
 103 {
 104         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
 105
 106         a->bounds.left                  = 0;
 107         a->bounds.top                   = 0;
 108         a->bounds.width                 = p->format.width;
 109         a->bounds.height                = p->format.height;
 110         a->defrect                      = a->bounds;
 111         a->type                         = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 112         a->pixelaspect.numerator        = 1;
 113         a->pixelaspect.denominator      = 1;
 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 };
 127
 128 static struct v4l2_subdev_ops platform_subdev_ops = {
 129         .core   = &platform_subdev_core_ops,
 130         .video  = &platform_subdev_video_ops,
 131 };
 132
 133 static struct soc_camera_ops soc_camera_platform_ops = {
 134         .set_bus_param          = soc_camera_platform_set_bus_param,
 135         .query_bus_param        = soc_camera_platform_query_bus_param,
 136 };
 137
 138 static int soc_camera_platform_probe(struct platform_device *pdev)
 139 {
 140         struct soc_camera_host *ici;
 141         struct soc_camera_platform_priv *priv;
 142         struct soc_camera_platform_info *p = pdev->dev.platform_data;
 143         struct soc_camera_device *icd;
 144         int ret;
 145
 146         if (!p)
 147                 return -EINVAL;
 148
 149         if (!p->icd) {
 150                 dev_err(&pdev->dev,
 151                         "Platform has not set soc_camera_device pointer!\n");
 152                 return -EINVAL;
 153         }
 154
 155         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 156         if (!priv)
 157                 return -ENOMEM;
 158
 159         icd = p->icd;
 160
 161         /* soc-camera convention: control's drvdata points to the subdev */
 162         platform_set_drvdata(pdev, &priv->subdev);
 163         /* Set the control device reference */
 164         icd->control = &pdev->dev;
 165
 166         icd->ops = &soc_camera_platform_ops;
 167
 168         ici = to_soc_camera_host(icd->parent);
 169
 170         v4l2_subdev_init(&priv->subdev, &platform_subdev_ops);
 171         v4l2_set_subdevdata(&priv->subdev, p);
 172         strncpy(priv->subdev.name, dev_name(&pdev->dev), V4L2_SUBDEV_NAME_SIZE);
 173
 174         ret = v4l2_device_register_subdev(&ici->v4l2_dev, &priv->subdev);
 175         if (ret)
 176                 goto evdrs;
 177
 178         return ret;
 179
 180 evdrs:
 181         icd->ops = NULL;
 182         platform_set_drvdata(pdev, NULL);
 183         kfree(priv);
 184         return ret;
 185 }
 186
 187 static int soc_camera_platform_remove(struct platform_device *pdev)
 188 {
 189         struct soc_camera_platform_priv *priv = get_priv(pdev);
 190         struct soc_camera_platform_info *p = pdev->dev.platform_data;
 191         struct soc_camera_device *icd = p->icd;
 192
 193         v4l2_device_unregister_subdev(&priv->subdev);
 194         icd->ops = NULL;
 195         platform_set_drvdata(pdev, NULL);
 196         kfree(priv);
 197         return 0;
 198 }
 199
 200 static struct platform_driver soc_camera_platform_driver = {
 201         .driver         = {
 202                 .name   = "soc_camera_platform",
 203                 .owner  = THIS_MODULE,
 204         },
 205         .probe          = soc_camera_platform_probe,
 206         .remove         = soc_camera_platform_remove,
 207 };
 208
 209 static int __init soc_camera_platform_module_init(void)
 210 {
 211         return platform_driver_register(&soc_camera_platform_driver);
 212 }
 213
 214 static void __exit soc_camera_platform_module_exit(void)
 215 {
 216         platform_driver_unregister(&soc_camera_platform_driver);
 217 }
 218
 219 module_init(soc_camera_platform_module_init);
 220 module_exit(soc_camera_platform_module_exit);
 221
 222 MODULE_DESCRIPTION("SoC Camera Platform driver");
 223 MODULE_AUTHOR("Magnus Damm");
 224 MODULE_LICENSE("GPL v2");
 225 MODULE_ALIAS("platform:soc_camera_platform");