kernel/2.6.29.6-aldebaran-rt/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_platform_info *info;
  25         struct soc_camera_device icd;
  26         struct soc_camera_data_format format;
  27 };
  28
  29 static struct soc_camera_platform_info *
  30 soc_camera_platform_get_info(struct soc_camera_device *icd)
  31 {
  32         struct soc_camera_platform_priv *priv;
  33         priv = container_of(icd, struct soc_camera_platform_priv, icd);
  34         return priv->info;
  35 }
  36
  37 static int soc_camera_platform_init(struct soc_camera_device *icd)
  38 {
  39         struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
  40
  41         if (p->power)
  42                 p->power(1);
  43
  44         return 0;
  45 }
  46
  47 static int soc_camera_platform_release(struct soc_camera_device *icd)
  48 {
  49         struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
  50
  51         if (p->power)
  52                 p->power(0);
  53
  54         return 0;
  55 }
  56
  57 static int soc_camera_platform_start_capture(struct soc_camera_device *icd)
  58 {
  59         struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
  60         return p->set_capture(p, 1);
  61 }
  62
  63 static int soc_camera_platform_stop_capture(struct soc_camera_device *icd)
  64 {
  65         struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
  66         return p->set_capture(p, 0);
  67 }
  68
  69 static int soc_camera_platform_set_bus_param(struct soc_camera_device *icd,
  70                                              unsigned long flags)
  71 {
  72         return 0;
  73 }
  74
  75 static unsigned long
  76 soc_camera_platform_query_bus_param(struct soc_camera_device *icd)
  77 {
  78         struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
  79         return p->bus_param;
  80 }
  81
  82 static int soc_camera_platform_set_fmt(struct soc_camera_device *icd,
  83                                        __u32 pixfmt, struct v4l2_rect *rect)
  84 {
  85         return 0;
  86 }
  87
  88 static int soc_camera_platform_try_fmt(struct soc_camera_device *icd,
  89                                        struct v4l2_format *f)
  90 {
  91         struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
  92         struct v4l2_pix_format *pix = &f->fmt.pix;
  93
  94         pix->width = p->format.width;
  95         pix->height = p->format.height;
  96         return 0;
  97 }
  98
  99 static int soc_camera_platform_video_probe(struct soc_camera_device *icd)
 100 {
 101         struct soc_camera_platform_priv *priv;
 102         priv = container_of(icd, struct soc_camera_platform_priv, icd);
 103
 104         priv->format.name = priv->info->format_name;
 105         priv->format.depth = priv->info->format_depth;
 106         priv->format.fourcc = priv->info->format.pixelformat;
 107         priv->format.colorspace = priv->info->format.colorspace;
 108
 109         icd->formats = &priv->format;
 110         icd->num_formats = 1;
 111
 112         return soc_camera_video_start(icd);
 113 }
 114
 115 static void soc_camera_platform_video_remove(struct soc_camera_device *icd)
 116 {
 117         soc_camera_video_stop(icd);
 118 }
 119
 120 static struct soc_camera_ops soc_camera_platform_ops = {
 121         .owner                  = THIS_MODULE,
 122         .probe                  = soc_camera_platform_video_probe,
 123         .remove                 = soc_camera_platform_video_remove,
 124         .init                   = soc_camera_platform_init,
 125         .release                = soc_camera_platform_release,
 126         .start_capture          = soc_camera_platform_start_capture,
 127         .stop_capture           = soc_camera_platform_stop_capture,
 128         .set_fmt                = soc_camera_platform_set_fmt,
 129         .try_fmt                = soc_camera_platform_try_fmt,
 130         .set_bus_param          = soc_camera_platform_set_bus_param,
 131         .query_bus_param        = soc_camera_platform_query_bus_param,
 132 };
 133
 134 static int soc_camera_platform_probe(struct platform_device *pdev)
 135 {
 136         struct soc_camera_platform_priv *priv;
 137         struct soc_camera_platform_info *p;
 138         struct soc_camera_device *icd;
 139         int ret;
 140
 141         p = pdev->dev.platform_data;
 142         if (!p)
 143                 return -EINVAL;
 144
 145         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 146         if (!priv)
 147                 return -ENOMEM;
 148
 149         priv->info = p;
 150         platform_set_drvdata(pdev, priv);
 151
 152         icd = &priv->icd;
 153         icd->ops        = &soc_camera_platform_ops;
 154         icd->control    = &pdev->dev;
 155         icd->width_min  = 0;
 156         icd->width_max  = priv->info->format.width;
 157         icd->height_min = 0;
 158         icd->height_max = priv->info->format.height;
 159         icd->y_skip_top = 0;
 160         icd->iface      = priv->info->iface;
 161
 162         ret = soc_camera_device_register(icd);
 163         if (ret)
 164                 kfree(priv);
 165
 166         return ret;
 167 }
 168
 169 static int soc_camera_platform_remove(struct platform_device *pdev)
 170 {
 171         struct soc_camera_platform_priv *priv = platform_get_drvdata(pdev);
 172
 173         soc_camera_device_unregister(&priv->icd);
 174         kfree(priv);
 175         return 0;
 176 }
 177
 178 static struct platform_driver soc_camera_platform_driver = {
 179         .driver         = {
 180                 .name   = "soc_camera_platform",
 181         },
 182         .probe          = soc_camera_platform_probe,
 183         .remove         = soc_camera_platform_remove,
 184 };
 185
 186 static int __init soc_camera_platform_module_init(void)
 187 {
 188         return platform_driver_register(&soc_camera_platform_driver);
 189 }
 190
 191 static void __exit soc_camera_platform_module_exit(void)
 192 {
 193         platform_driver_unregister(&soc_camera_platform_driver);
 194 }
 195
 196 module_init(soc_camera_platform_module_init);
 197 module_exit(soc_camera_platform_module_exit);
 198
 199 MODULE_DESCRIPTION("SoC Camera Platform driver");
 200 MODULE_AUTHOR("Magnus Damm");
 201 MODULE_LICENSE("GPL v2");