linux/drivers/media/video/soc_camera_platform.c
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   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
  23struct soc_camera_platform_priv {
  24        struct v4l2_subdev subdev;
  25};
  26
  27static 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
  33static 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
  40static 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
  46static int soc_camera_platform_set_bus_param(struct soc_camera_device *icd,
  47                                             unsigned long flags)
  48{
  49        return 0;
  50}
  51
  52static unsigned long
  53soc_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
  59static int soc_camera_platform_try_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
  69        return 0;
  70}
  71
  72static struct v4l2_subdev_core_ops platform_subdev_core_ops;
  73
  74static int soc_camera_platform_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
  75                                        enum v4l2_mbus_pixelcode *code)
  76{
  77        struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
  78
  79        if (index)
  80                return -EINVAL;
  81
  82        *code = p->format.code;
  83        return 0;
  84}
  85
  86static struct v4l2_subdev_video_ops platform_subdev_video_ops = {
  87        .s_stream       = soc_camera_platform_s_stream,
  88        .try_mbus_fmt   = soc_camera_platform_try_fmt,
  89        .enum_mbus_fmt  = soc_camera_platform_enum_fmt,
  90};
  91
  92static struct v4l2_subdev_ops platform_subdev_ops = {
  93        .core   = &platform_subdev_core_ops,
  94        .video  = &platform_subdev_video_ops,
  95};
  96
  97static struct soc_camera_ops soc_camera_platform_ops = {
  98        .set_bus_param          = soc_camera_platform_set_bus_param,
  99        .query_bus_param        = soc_camera_platform_query_bus_param,
 100};
 101
 102static int soc_camera_platform_probe(struct platform_device *pdev)
 103{
 104        struct soc_camera_host *ici;
 105        struct soc_camera_platform_priv *priv;
 106        struct soc_camera_platform_info *p = pdev->dev.platform_data;
 107        struct soc_camera_device *icd;
 108        int ret;
 109
 110        if (!p)
 111                return -EINVAL;
 112
 113        if (!p->dev) {
 114                dev_err(&pdev->dev,
 115                        "Platform has not set soc_camera_device pointer!\n");
 116                return -EINVAL;
 117        }
 118
 119        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 120        if (!priv)
 121                return -ENOMEM;
 122
 123        icd = to_soc_camera_dev(p->dev);
 124
 125        /* soc-camera convention: control's drvdata points to the subdev */
 126        platform_set_drvdata(pdev, &priv->subdev);
 127        /* Set the control device reference */
 128        dev_set_drvdata(&icd->dev, &pdev->dev);
 129
 130        icd->ops = &soc_camera_platform_ops;
 131
 132        ici = to_soc_camera_host(icd->dev.parent);
 133
 134        v4l2_subdev_init(&priv->subdev, &platform_subdev_ops);
 135        v4l2_set_subdevdata(&priv->subdev, p);
 136        strncpy(priv->subdev.name, dev_name(&pdev->dev), V4L2_SUBDEV_NAME_SIZE);
 137
 138        ret = v4l2_device_register_subdev(&ici->v4l2_dev, &priv->subdev);
 139        if (ret)
 140                goto evdrs;
 141
 142        return ret;
 143
 144evdrs:
 145        icd->ops = NULL;
 146        platform_set_drvdata(pdev, NULL);
 147        kfree(priv);
 148        return ret;
 149}
 150
 151static int soc_camera_platform_remove(struct platform_device *pdev)
 152{
 153        struct soc_camera_platform_priv *priv = get_priv(pdev);
 154        struct soc_camera_platform_info *p = pdev->dev.platform_data;
 155        struct soc_camera_device *icd = to_soc_camera_dev(p->dev);
 156
 157        v4l2_device_unregister_subdev(&priv->subdev);
 158        icd->ops = NULL;
 159        platform_set_drvdata(pdev, NULL);
 160        kfree(priv);
 161        return 0;
 162}
 163
 164static struct platform_driver soc_camera_platform_driver = {
 165        .driver         = {
 166                .name   = "soc_camera_platform",
 167                .owner  = THIS_MODULE,
 168        },
 169        .probe          = soc_camera_platform_probe,
 170        .remove         = soc_camera_platform_remove,
 171};
 172
 173static int __init soc_camera_platform_module_init(void)
 174{
 175        return platform_driver_register(&soc_camera_platform_driver);
 176}
 177
 178static void __exit soc_camera_platform_module_exit(void)
 179{
 180        platform_driver_unregister(&soc_camera_platform_driver);
 181}
 182
 183module_init(soc_camera_platform_module_init);
 184module_exit(soc_camera_platform_module_exit);
 185
 186MODULE_DESCRIPTION("SoC Camera Platform driver");
 187MODULE_AUTHOR("Magnus Damm");
 188MODULE_LICENSE("GPL v2");
 189MODULE_ALIAS("platform:soc_camera_platform");
 190