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Linux/drivers/media/platform/soc_camera/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-subdev.h>
 20 #include <media/soc_camera.h>
 21 #include <media/soc_camera_platform.h>
 22 
 23 struct soc_camera_platform_priv {
 24         struct v4l2_subdev subdev;
 25 };
 26 
 27 static 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 
 33 static int soc_camera_platform_s_stream(struct v4l2_subdev *sd, int enable)
 34 {
 35         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
 36         return p->set_capture(p, enable);
 37 }
 38 
 39 static int soc_camera_platform_fill_fmt(struct v4l2_subdev *sd,
 40                                         struct v4l2_mbus_framefmt *mf)
 41 {
 42         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
 43 
 44         mf->width       = p->format.width;
 45         mf->height      = p->format.height;
 46         mf->code        = p->format.code;
 47         mf->colorspace  = p->format.colorspace;
 48         mf->field       = p->format.field;
 49 
 50         return 0;
 51 }
 52 
 53 static int soc_camera_platform_s_power(struct v4l2_subdev *sd, int on)
 54 {
 55         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
 56 
 57         return soc_camera_set_power(p->icd->control, &p->icd->sdesc->subdev_desc, NULL, on);
 58 }
 59 
 60 static struct v4l2_subdev_core_ops platform_subdev_core_ops = {
 61         .s_power = soc_camera_platform_s_power,
 62 };
 63 
 64 static int soc_camera_platform_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
 65                                         enum v4l2_mbus_pixelcode *code)
 66 {
 67         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
 68 
 69         if (index)
 70                 return -EINVAL;
 71 
 72         *code = p->format.code;
 73         return 0;
 74 }
 75 
 76 static int soc_camera_platform_g_crop(struct v4l2_subdev *sd,
 77                                       struct v4l2_crop *a)
 78 {
 79         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
 80 
 81         a->c.left       = 0;
 82         a->c.top        = 0;
 83         a->c.width      = p->format.width;
 84         a->c.height     = p->format.height;
 85         a->type         = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 86 
 87         return 0;
 88 }
 89 
 90 static int soc_camera_platform_cropcap(struct v4l2_subdev *sd,
 91                                        struct v4l2_cropcap *a)
 92 {
 93         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
 94 
 95         a->bounds.left                  = 0;
 96         a->bounds.top                   = 0;
 97         a->bounds.width                 = p->format.width;
 98         a->bounds.height                = p->format.height;
 99         a->defrect                      = a->bounds;
100         a->type                         = V4L2_BUF_TYPE_VIDEO_CAPTURE;
101         a->pixelaspect.numerator        = 1;
102         a->pixelaspect.denominator      = 1;
103 
104         return 0;
105 }
106 
107 static int soc_camera_platform_g_mbus_config(struct v4l2_subdev *sd,
108                                              struct v4l2_mbus_config *cfg)
109 {
110         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
111 
112         cfg->flags = p->mbus_param;
113         cfg->type = p->mbus_type;
114 
115         return 0;
116 }
117 
118 static struct v4l2_subdev_video_ops platform_subdev_video_ops = {
119         .s_stream       = soc_camera_platform_s_stream,
120         .enum_mbus_fmt  = soc_camera_platform_enum_fmt,
121         .cropcap        = soc_camera_platform_cropcap,
122         .g_crop         = soc_camera_platform_g_crop,
123         .try_mbus_fmt   = soc_camera_platform_fill_fmt,
124         .g_mbus_fmt     = soc_camera_platform_fill_fmt,
125         .s_mbus_fmt     = soc_camera_platform_fill_fmt,
126         .g_mbus_config  = soc_camera_platform_g_mbus_config,
127 };
128 
129 static struct v4l2_subdev_ops platform_subdev_ops = {
130         .core   = &platform_subdev_core_ops,
131         .video  = &platform_subdev_video_ops,
132 };
133 
134 static int soc_camera_platform_probe(struct platform_device *pdev)
135 {
136         struct soc_camera_host *ici;
137         struct soc_camera_platform_priv *priv;
138         struct soc_camera_platform_info *p = pdev->dev.platform_data;
139         struct soc_camera_device *icd;
140 
141         if (!p)
142                 return -EINVAL;
143 
144         if (!p->icd) {
145                 dev_err(&pdev->dev,
146                         "Platform has not set soc_camera_device pointer!\n");
147                 return -EINVAL;
148         }
149 
150         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
151         if (!priv)
152                 return -ENOMEM;
153 
154         icd = p->icd;
155 
156         /* soc-camera convention: control's drvdata points to the subdev */
157         platform_set_drvdata(pdev, &priv->subdev);
158         /* Set the control device reference */
159         icd->control = &pdev->dev;
160 
161         ici = to_soc_camera_host(icd->parent);
162 
163         v4l2_subdev_init(&priv->subdev, &platform_subdev_ops);
164         v4l2_set_subdevdata(&priv->subdev, p);
165         strncpy(priv->subdev.name, dev_name(&pdev->dev), V4L2_SUBDEV_NAME_SIZE);
166 
167         return v4l2_device_register_subdev(&ici->v4l2_dev, &priv->subdev);
168 }
169 
170 static int soc_camera_platform_remove(struct platform_device *pdev)
171 {
172         struct soc_camera_platform_priv *priv = get_priv(pdev);
173         struct soc_camera_platform_info *p = v4l2_get_subdevdata(&priv->subdev);
174 
175         p->icd->control = NULL;
176         v4l2_device_unregister_subdev(&priv->subdev);
177         return 0;
178 }
179 
180 static struct platform_driver soc_camera_platform_driver = {
181         .driver         = {
182                 .name   = "soc_camera_platform",
183                 .owner  = THIS_MODULE,
184         },
185         .probe          = soc_camera_platform_probe,
186         .remove         = soc_camera_platform_remove,
187 };
188 
189 module_platform_driver(soc_camera_platform_driver);
190 
191 MODULE_DESCRIPTION("SoC Camera Platform driver");
192 MODULE_AUTHOR("Magnus Damm");
193 MODULE_LICENSE("GPL v2");
194 MODULE_ALIAS("platform:soc_camera_platform");
195 

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