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-common.h>
  20 #include <media/soc_camera.h>
  21 #include <media/soc_camera_platform.h>
  22
  23 struct soc_camera_platform_priv {
  24         struct soc_camera_data_format format;
  25 };
  26
  27 static struct soc_camera_platform_info *
  28 soc_camera_platform_get_info(struct soc_camera_device *icd)
  29 {
  30         struct platform_device *pdev = to_platform_device(dev_get_drvdata(&icd->dev));
  31         return pdev->dev.platform_data;
  32 }
  33
  34 static int soc_camera_platform_init(struct soc_camera_device *icd)
  35 {
  36         struct soc_camera_link *icl = to_soc_camera_link(icd);
  37
  38         if (icl->power)
  39                 icl->power(dev_get_drvdata(&icd->dev), 1);
  40
  41         return 0;
  42 }
  43
  44 static int soc_camera_platform_release(struct soc_camera_device *icd)
  45 {
  46         struct soc_camera_link *icl = to_soc_camera_link(icd);
  47
  48         if (icl->power)
  49                 icl->power(dev_get_drvdata(&icd->dev), 0);
  50
  51         return 0;
  52 }
  53
  54 static int soc_camera_platform_start_capture(struct soc_camera_device *icd)
  55 {
  56         struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
  57         return p->set_capture(p, 1);
  58 }
  59
  60 static int soc_camera_platform_stop_capture(struct soc_camera_device *icd)
  61 {
  62         struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
  63         return p->set_capture(p, 0);
  64 }
  65
  66 static int soc_camera_platform_set_bus_param(struct soc_camera_device *icd,
  67                                              unsigned long flags)
  68 {
  69         return 0;
  70 }
  71
  72 static unsigned long
  73 soc_camera_platform_query_bus_param(struct soc_camera_device *icd)
  74 {
  75         struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
  76         return p->bus_param;
  77 }
  78
  79 static int soc_camera_platform_set_crop(struct soc_camera_device *icd,
  80                                         struct v4l2_rect *rect)
  81 {
  82         return 0;
  83 }
  84
  85 static int soc_camera_platform_set_fmt(struct soc_camera_device *icd,
  86                                        struct v4l2_format *f)
  87 {
  88         return 0;
  89 }
  90
  91 static int soc_camera_platform_try_fmt(struct soc_camera_device *icd,
  92                                        struct v4l2_format *f)
  93 {
  94         struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
  95         struct v4l2_pix_format *pix = &f->fmt.pix;
  96
  97         pix->width = p->format.width;
  98         pix->height = p->format.height;
  99         return 0;
 100 }
 101
 102 static int soc_camera_platform_video_probe(struct soc_camera_device *icd,
 103                                            struct platform_device *pdev)
 104 {
 105         struct soc_camera_platform_priv *priv = platform_get_drvdata(pdev);
 106         struct soc_camera_platform_info *p = pdev->dev.platform_data;
 107         int ret;
 108
 109         priv->format.name = p->format_name;
 110         priv->format.depth = p->format_depth;
 111         priv->format.fourcc = p->format.pixelformat;
 112         priv->format.colorspace = p->format.colorspace;
 113
 114         icd->formats = &priv->format;
 115         icd->num_formats = 1;
 116
 117         /* ..._video_start() does dev_set_drvdata(&icd->dev, &pdev->dev) */
 118         ret = soc_camera_video_start(icd, &pdev->dev);
 119         soc_camera_video_stop(icd);
 120         return ret;
 121 }
 122
 123 static struct soc_camera_ops soc_camera_platform_ops = {
 124         .owner                  = THIS_MODULE,
 125         .init                   = soc_camera_platform_init,
 126         .release                = soc_camera_platform_release,
 127         .start_capture          = soc_camera_platform_start_capture,
 128         .stop_capture           = soc_camera_platform_stop_capture,
 129         .set_crop               = soc_camera_platform_set_crop,
 130         .set_fmt                = soc_camera_platform_set_fmt,
 131         .try_fmt                = soc_camera_platform_try_fmt,
 132         .set_bus_param          = soc_camera_platform_set_bus_param,
 133         .query_bus_param        = soc_camera_platform_query_bus_param,
 134 };
 135
 136 static int soc_camera_platform_probe(struct platform_device *pdev)
 137 {
 138         struct soc_camera_platform_priv *priv;
 139         struct soc_camera_platform_info *p = pdev->dev.platform_data;
 140         struct soc_camera_device *icd;
 141         int ret;
 142
 143         if (!p)
 144                 return -EINVAL;
 145
 146         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 147         if (!priv)
 148                 return -ENOMEM;
 149
 150         platform_set_drvdata(pdev, priv);
 151
 152         icd = to_soc_camera_dev(p->dev);
 153         if (!icd)
 154                 goto enoicd;
 155
 156         icd->ops        = &soc_camera_platform_ops;
 157         dev_set_drvdata(&icd->dev, &pdev->dev);
 158         icd->width_min  = 0;
 159         icd->width_max  = p->format.width;
 160         icd->height_min = 0;
 161         icd->height_max = p->format.height;
 162         icd->y_skip_top = 0;
 163
 164         ret = soc_camera_platform_video_probe(icd, pdev);
 165         if (ret) {
 166                 icd->ops = NULL;
 167                 kfree(priv);
 168         }
 169
 170         return ret;
 171
 172 enoicd:
 173         kfree(priv);
 174         return -EINVAL;
 175 }
 176
 177 static int soc_camera_platform_remove(struct platform_device *pdev)
 178 {
 179         struct soc_camera_platform_priv *priv = platform_get_drvdata(pdev);
 180         struct soc_camera_platform_info *p = pdev->dev.platform_data;
 181         struct soc_camera_device *icd = to_soc_camera_dev(p->dev);
 182
 183         icd->ops = NULL;
 184         kfree(priv);
 185         return 0;
 186 }
 187
 188 static struct platform_driver soc_camera_platform_driver = {
 189         .driver         = {
 190                 .name   = "soc_camera_platform",
 191         },
 192         .probe          = soc_camera_platform_probe,
 193         .remove         = soc_camera_platform_remove,
 194 };
 195
 196 static int __init soc_camera_platform_module_init(void)
 197 {
 198         return platform_driver_register(&soc_camera_platform_driver);
 199 }
 200
 201 static void __exit soc_camera_platform_module_exit(void)
 202 {
 203         platform_driver_unregister(&soc_camera_platform_driver);
 204 }
 205
 206 module_init(soc_camera_platform_module_init);
 207 module_exit(soc_camera_platform_module_exit);
 208
 209 MODULE_DESCRIPTION("SoC Camera Platform driver");
 210 MODULE_AUTHOR("Magnus Damm");
 211 MODULE_LICENSE("GPL v2");
 212 MODULE_ALIAS("platform:soc_camera_platform");