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         struct soc_camera_data_format format;
  26 };
  27
  28 static struct soc_camera_platform_priv *get_priv(struct platform_device *pdev)
  29 {
  30         struct v4l2_subdev *subdev = platform_get_drvdata(pdev);
  31         return container_of(subdev, struct soc_camera_platform_priv, subdev);
  32 }
  33
  34 static struct soc_camera_platform_info *get_info(struct soc_camera_device *icd)
  35 {
  36         struct platform_device *pdev =
  37                 to_platform_device(to_soc_camera_control(icd));
  38         return pdev->dev.platform_data;
  39 }
  40
  41 static int soc_camera_platform_s_stream(struct v4l2_subdev *sd, int enable)
  42 {
  43         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  44         return p->set_capture(p, enable);
  45 }
  46
  47 static int soc_camera_platform_set_bus_param(struct soc_camera_device *icd,
  48                                              unsigned long flags)
  49 {
  50         return 0;
  51 }
  52
  53 static unsigned long
  54 soc_camera_platform_query_bus_param(struct soc_camera_device *icd)
  55 {
  56         struct soc_camera_platform_info *p = get_info(icd);
  57         return p->bus_param;
  58 }
  59
  60 static int soc_camera_platform_try_fmt(struct v4l2_subdev *sd,
  61                                        struct v4l2_format *f)
  62 {
  63         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  64         struct v4l2_pix_format *pix = &f->fmt.pix;
  65
  66         pix->width = p->format.width;
  67         pix->height = p->format.height;
  68         return 0;
  69 }
  70
  71 static void soc_camera_platform_video_probe(struct soc_camera_device *icd,
  72                                             struct platform_device *pdev)
  73 {
  74         struct soc_camera_platform_priv *priv = get_priv(pdev);
  75         struct soc_camera_platform_info *p = pdev->dev.platform_data;
  76
  77         priv->format.name = p->format_name;
  78         priv->format.depth = p->format_depth;
  79         priv->format.fourcc = p->format.pixelformat;
  80         priv->format.colorspace = p->format.colorspace;
  81
  82         icd->formats = &priv->format;
  83         icd->num_formats = 1;
  84 }
  85
  86 static struct v4l2_subdev_core_ops platform_subdev_core_ops;
  87
  88 static struct v4l2_subdev_video_ops platform_subdev_video_ops = {
  89         .s_stream       = soc_camera_platform_s_stream,
  90         .try_fmt        = soc_camera_platform_try_fmt,
  91 };
  92
  93 static struct v4l2_subdev_ops platform_subdev_ops = {
  94         .core   = &platform_subdev_core_ops,
  95         .video  = &platform_subdev_video_ops,
  96 };
  97
  98 static struct soc_camera_ops soc_camera_platform_ops = {
  99         .set_bus_param          = soc_camera_platform_set_bus_param,
 100         .query_bus_param        = soc_camera_platform_query_bus_param,
 101 };
 102
 103 static int soc_camera_platform_probe(struct platform_device *pdev)
 104 {
 105         struct soc_camera_host *ici;
 106         struct soc_camera_platform_priv *priv;
 107         struct soc_camera_platform_info *p = pdev->dev.platform_data;
 108         struct soc_camera_device *icd;
 109         int ret;
 110
 111         if (!p)
 112                 return -EINVAL;
 113
 114         if (!p->dev) {
 115                 dev_err(&pdev->dev,
 116                         "Platform has not set soc_camera_device pointer!\n");
 117                 return -EINVAL;
 118         }
 119
 120         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 121         if (!priv)
 122                 return -ENOMEM;
 123
 124         icd = to_soc_camera_dev(p->dev);
 125
 126         /* soc-camera convention: control's drvdata points to the subdev */
 127         platform_set_drvdata(pdev, &priv->subdev);
 128         /* Set the control device reference */
 129         dev_set_drvdata(&icd->dev, &pdev->dev);
 130
 131         icd->y_skip_top         = 0;
 132         icd->ops                = &soc_camera_platform_ops;
 133
 134         ici = to_soc_camera_host(icd->dev.parent);
 135
 136         soc_camera_platform_video_probe(icd, pdev);
 137
 138         v4l2_subdev_init(&priv->subdev, &platform_subdev_ops);
 139         v4l2_set_subdevdata(&priv->subdev, p);
 140         strncpy(priv->subdev.name, dev_name(&pdev->dev), V4L2_SUBDEV_NAME_SIZE);
 141
 142         ret = v4l2_device_register_subdev(&ici->v4l2_dev, &priv->subdev);
 143         if (ret)
 144                 goto evdrs;
 145
 146         return ret;
 147
 148 evdrs:
 149         icd->ops = NULL;
 150         platform_set_drvdata(pdev, NULL);
 151         kfree(priv);
 152         return ret;
 153 }
 154
 155 static int soc_camera_platform_remove(struct platform_device *pdev)
 156 {
 157         struct soc_camera_platform_priv *priv = get_priv(pdev);
 158         struct soc_camera_platform_info *p = pdev->dev.platform_data;
 159         struct soc_camera_device *icd = to_soc_camera_dev(p->dev);
 160
 161         v4l2_device_unregister_subdev(&priv->subdev);
 162         icd->ops = NULL;
 163         platform_set_drvdata(pdev, NULL);
 164         kfree(priv);
 165         return 0;
 166 }
 167
 168 static struct platform_driver soc_camera_platform_driver = {
 169         .driver         = {
 170                 .name   = "soc_camera_platform",
 171                 .owner  = THIS_MODULE,
 172         },
 173         .probe          = soc_camera_platform_probe,
 174         .remove         = soc_camera_platform_remove,
 175 };
 176
 177 static int __init soc_camera_platform_module_init(void)
 178 {
 179         return platform_driver_register(&soc_camera_platform_driver);
 180 }
 181
 182 static void __exit soc_camera_platform_module_exit(void)
 183 {
 184         platform_driver_unregister(&soc_camera_platform_driver);
 185 }
 186
 187 module_init(soc_camera_platform_module_init);
 188 module_exit(soc_camera_platform_module_exit);
 189
 190 MODULE_DESCRIPTION("SoC Camera Platform driver");
 191 MODULE_AUTHOR("Magnus Damm");
 192 MODULE_LICENSE("GPL v2");
 193 MODULE_ALIAS("platform:soc_camera_platform");