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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 <linux/platform_data/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_subdev_pad_config *cfg,
 41                 struct v4l2_subdev_format *format)
 42 {
 43         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
 44         struct v4l2_mbus_framefmt *mf = &format->format;
 45 
 46         mf->width       = p->format.width;
 47         mf->height      = p->format.height;
 48         mf->code        = p->format.code;
 49         mf->colorspace  = p->format.colorspace;
 50         mf->field       = p->format.field;
 51 
 52         return 0;
 53 }
 54 
 55 static int soc_camera_platform_s_power(struct v4l2_subdev *sd, int on)
 56 {
 57         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
 58 
 59         return soc_camera_set_power(p->icd->control, &p->icd->sdesc->subdev_desc, NULL, on);
 60 }
 61 
 62 static struct v4l2_subdev_core_ops platform_subdev_core_ops = {
 63         .s_power = soc_camera_platform_s_power,
 64 };
 65 
 66 static int soc_camera_platform_enum_mbus_code(struct v4l2_subdev *sd,
 67                 struct v4l2_subdev_pad_config *cfg,
 68                 struct v4l2_subdev_mbus_code_enum *code)
 69 {
 70         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
 71 
 72         if (code->pad || code->index)
 73                 return -EINVAL;
 74 
 75         code->code = p->format.code;
 76         return 0;
 77 }
 78 
 79 static int soc_camera_platform_get_selection(struct v4l2_subdev *sd,
 80                 struct v4l2_subdev_pad_config *cfg,
 81                 struct v4l2_subdev_selection *sel)
 82 {
 83         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
 84 
 85         if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
 86                 return -EINVAL;
 87 
 88         switch (sel->target) {
 89         case V4L2_SEL_TGT_CROP_BOUNDS:
 90         case V4L2_SEL_TGT_CROP_DEFAULT:
 91         case V4L2_SEL_TGT_CROP:
 92                 sel->r.left = 0;
 93                 sel->r.top = 0;
 94                 sel->r.width = p->format.width;
 95                 sel->r.height = p->format.height;
 96                 return 0;
 97         default:
 98                 return -EINVAL;
 99         }
100 }
101 
102 static int soc_camera_platform_g_mbus_config(struct v4l2_subdev *sd,
103                                              struct v4l2_mbus_config *cfg)
104 {
105         struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
106 
107         cfg->flags = p->mbus_param;
108         cfg->type = p->mbus_type;
109 
110         return 0;
111 }
112 
113 static struct v4l2_subdev_video_ops platform_subdev_video_ops = {
114         .s_stream       = soc_camera_platform_s_stream,
115         .g_mbus_config  = soc_camera_platform_g_mbus_config,
116 };
117 
118 static const struct v4l2_subdev_pad_ops platform_subdev_pad_ops = {
119         .enum_mbus_code = soc_camera_platform_enum_mbus_code,
120         .get_selection  = soc_camera_platform_get_selection,
121         .get_fmt        = soc_camera_platform_fill_fmt,
122         .set_fmt        = soc_camera_platform_fill_fmt,
123 };
124 
125 static struct v4l2_subdev_ops platform_subdev_ops = {
126         .core   = &platform_subdev_core_ops,
127         .video  = &platform_subdev_video_ops,
128         .pad    = &platform_subdev_pad_ops,
129 };
130 
131 static int soc_camera_platform_probe(struct platform_device *pdev)
132 {
133         struct soc_camera_host *ici;
134         struct soc_camera_platform_priv *priv;
135         struct soc_camera_platform_info *p = pdev->dev.platform_data;
136         struct soc_camera_device *icd;
137 
138         if (!p)
139                 return -EINVAL;
140 
141         if (!p->icd) {
142                 dev_err(&pdev->dev,
143                         "Platform has not set soc_camera_device pointer!\n");
144                 return -EINVAL;
145         }
146 
147         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
148         if (!priv)
149                 return -ENOMEM;
150 
151         icd = p->icd;
152 
153         /* soc-camera convention: control's drvdata points to the subdev */
154         platform_set_drvdata(pdev, &priv->subdev);
155         /* Set the control device reference */
156         icd->control = &pdev->dev;
157 
158         ici = to_soc_camera_host(icd->parent);
159 
160         v4l2_subdev_init(&priv->subdev, &platform_subdev_ops);
161         v4l2_set_subdevdata(&priv->subdev, p);
162         strncpy(priv->subdev.name, dev_name(&pdev->dev), V4L2_SUBDEV_NAME_SIZE);
163 
164         return v4l2_device_register_subdev(&ici->v4l2_dev, &priv->subdev);
165 }
166 
167 static int soc_camera_platform_remove(struct platform_device *pdev)
168 {
169         struct soc_camera_platform_priv *priv = get_priv(pdev);
170         struct soc_camera_platform_info *p = v4l2_get_subdevdata(&priv->subdev);
171 
172         p->icd->control = NULL;
173         v4l2_device_unregister_subdev(&priv->subdev);
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 module_platform_driver(soc_camera_platform_driver);
186 
187 MODULE_DESCRIPTION("SoC Camera Platform driver");
188 MODULE_AUTHOR("Magnus Damm");
189 MODULE_LICENSE("GPL v2");
190 MODULE_ALIAS("platform:soc_camera_platform");
191 

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