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