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_crop(struct soc_camera_device *icd,
  83                                         struct v4l2_rect *rect)
  84 {
  85         return 0;
  86 }
  87
  88 static int soc_camera_platform_set_fmt(struct soc_camera_device *icd,
  89                                        struct v4l2_format *f)
  90 {
  91         return 0;
  92 }
  93
  94 static int soc_camera_platform_try_fmt(struct soc_camera_device *icd,
  95                                        struct v4l2_format *f)
  96 {
  97         struct soc_camera_platform_info *p = soc_camera_platform_get_info(icd);
  98         struct v4l2_pix_format *pix = &f->fmt.pix;
  99
 100         pix->width = p->format.width;
 101         pix->height = p->format.height;
 102         return 0;
 103 }
 104
 105 static int soc_camera_platform_video_probe(struct soc_camera_device *icd)
 106 {
 107         struct soc_camera_platform_priv *priv;
 108         priv = container_of(icd, struct soc_camera_platform_priv, icd);
 109
 110         priv->format.name = priv->info->format_name;
 111         priv->format.depth = priv->info->format_depth;
 112         priv->format.fourcc = priv->info->format.pixelformat;
 113         priv->format.colorspace = priv->info->format.colorspace;
 114
 115         icd->formats = &priv->format;
 116         icd->num_formats = 1;
 117
 118         return soc_camera_video_start(icd);
 119 }
 120
 121 static void soc_camera_platform_video_remove(struct soc_camera_device *icd)
 122 {
 123         soc_camera_video_stop(icd);
 124 }
 125
 126 static struct soc_camera_ops soc_camera_platform_ops = {
 127         .owner                  = THIS_MODULE,
 128         .probe                  = soc_camera_platform_video_probe,
 129         .remove                 = soc_camera_platform_video_remove,
 130         .init                   = soc_camera_platform_init,
 131         .release                = soc_camera_platform_release,
 132         .start_capture          = soc_camera_platform_start_capture,
 133         .stop_capture           = soc_camera_platform_stop_capture,
 134         .set_crop               = soc_camera_platform_set_crop,
 135         .set_fmt                = soc_camera_platform_set_fmt,
 136         .try_fmt                = soc_camera_platform_try_fmt,
 137         .set_bus_param          = soc_camera_platform_set_bus_param,
 138         .query_bus_param        = soc_camera_platform_query_bus_param,
 139 };
 140
 141 static int soc_camera_platform_probe(struct platform_device *pdev)
 142 {
 143         struct soc_camera_platform_priv *priv;
 144         struct soc_camera_platform_info *p;
 145         struct soc_camera_device *icd;
 146         int ret;
 147
 148         p = pdev->dev.platform_data;
 149         if (!p)
 150                 return -EINVAL;
 151
 152         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 153         if (!priv)
 154                 return -ENOMEM;
 155
 156         priv->info = p;
 157         platform_set_drvdata(pdev, priv);
 158
 159         icd = &priv->icd;
 160         icd->ops        = &soc_camera_platform_ops;
 161         icd->control    = &pdev->dev;
 162         icd->width_min  = 0;
 163         icd->width_max  = priv->info->format.width;
 164         icd->height_min = 0;
 165         icd->height_max = priv->info->format.height;
 166         icd->y_skip_top = 0;
 167         icd->iface      = priv->info->iface;
 168
 169         ret = soc_camera_device_register(icd);
 170         if (ret)
 171                 kfree(priv);
 172
 173         return ret;
 174 }
 175
 176 static int soc_camera_platform_remove(struct platform_device *pdev)
 177 {
 178         struct soc_camera_platform_priv *priv = platform_get_drvdata(pdev);
 179
 180         soc_camera_device_unregister(&priv->icd);
 181         kfree(priv);
 182         return 0;
 183 }
 184
 185 static struct platform_driver soc_camera_platform_driver = {
 186         .driver         = {
 187                 .name   = "soc_camera_platform",
 188         },
 189         .probe          = soc_camera_platform_probe,
 190         .remove         = soc_camera_platform_remove,
 191 };
 192
 193 static int __init soc_camera_platform_module_init(void)
 194 {
 195         return platform_driver_register(&soc_camera_platform_driver);
 196 }
 197
 198 static void __exit soc_camera_platform_module_exit(void)
 199 {
 200         platform_driver_unregister(&soc_camera_platform_driver);
 201 }
 202
 203 module_init(soc_camera_platform_module_init);
 204 module_exit(soc_camera_platform_module_exit);
 205
 206 MODULE_DESCRIPTION("SoC Camera Platform driver");
 207 MODULE_AUTHOR("Magnus Damm");
 208 MODULE_LICENSE("GPL v2");