198 lines
5.2 KiB
C
198 lines
5.2 KiB
C
/*
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* Generic Platform Camera Driver
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*
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* Copyright (C) 2008 Magnus Damm
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* Based on mt9m001 driver,
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* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-subdev.h>
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#include <media/soc_camera.h>
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#include <media/soc_camera_platform.h>
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struct soc_camera_platform_priv {
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struct v4l2_subdev subdev;
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struct soc_camera_data_format format;
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};
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static struct soc_camera_platform_priv *get_priv(struct platform_device *pdev)
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{
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struct v4l2_subdev *subdev = platform_get_drvdata(pdev);
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return container_of(subdev, struct soc_camera_platform_priv, subdev);
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}
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static struct soc_camera_platform_info *get_info(struct soc_camera_device *icd)
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{
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struct platform_device *pdev = to_platform_device(to_soc_camera_control(icd));
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return pdev->dev.platform_data;
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}
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static int soc_camera_platform_s_stream(struct v4l2_subdev *sd, int enable)
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{
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struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
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return p->set_capture(p, enable);
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}
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static int soc_camera_platform_set_bus_param(struct soc_camera_device *icd,
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unsigned long flags)
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{
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return 0;
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}
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static unsigned long
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soc_camera_platform_query_bus_param(struct soc_camera_device *icd)
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{
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struct soc_camera_platform_info *p = get_info(icd);
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return p->bus_param;
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}
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static int soc_camera_platform_try_fmt(struct v4l2_subdev *sd,
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struct v4l2_format *f)
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{
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struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
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struct v4l2_pix_format *pix = &f->fmt.pix;
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pix->width = p->format.width;
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pix->height = p->format.height;
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return 0;
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}
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static void soc_camera_platform_video_probe(struct soc_camera_device *icd,
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struct platform_device *pdev)
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{
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struct soc_camera_platform_priv *priv = get_priv(pdev);
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struct soc_camera_platform_info *p = pdev->dev.platform_data;
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priv->format.name = p->format_name;
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priv->format.depth = p->format_depth;
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priv->format.fourcc = p->format.pixelformat;
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priv->format.colorspace = p->format.colorspace;
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icd->formats = &priv->format;
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icd->num_formats = 1;
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}
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static struct v4l2_subdev_core_ops platform_subdev_core_ops;
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static struct v4l2_subdev_video_ops platform_subdev_video_ops = {
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.s_stream = soc_camera_platform_s_stream,
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.try_fmt = soc_camera_platform_try_fmt,
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};
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static struct v4l2_subdev_ops platform_subdev_ops = {
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.core = &platform_subdev_core_ops,
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.video = &platform_subdev_video_ops,
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};
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static struct soc_camera_ops soc_camera_platform_ops = {
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.set_bus_param = soc_camera_platform_set_bus_param,
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.query_bus_param = soc_camera_platform_query_bus_param,
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};
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static int soc_camera_platform_probe(struct platform_device *pdev)
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{
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struct soc_camera_host *ici;
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struct soc_camera_platform_priv *priv;
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struct soc_camera_platform_info *p = pdev->dev.platform_data;
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struct soc_camera_device *icd;
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int ret;
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if (!p)
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return -EINVAL;
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if (!p->dev) {
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dev_err(&pdev->dev,
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"Platform has not set soc_camera_device pointer!\n");
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return -EINVAL;
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}
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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icd = to_soc_camera_dev(p->dev);
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/* soc-camera convention: control's drvdata points to the subdev */
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platform_set_drvdata(pdev, &priv->subdev);
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/* Set the control device reference */
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dev_set_drvdata(&icd->dev, &pdev->dev);
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icd->width_min = 0;
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icd->rect_max.width = p->format.width;
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icd->height_min = 0;
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icd->rect_max.height = p->format.height;
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icd->y_skip_top = 0;
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icd->ops = &soc_camera_platform_ops;
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ici = to_soc_camera_host(icd->dev.parent);
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soc_camera_platform_video_probe(icd, pdev);
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v4l2_subdev_init(&priv->subdev, &platform_subdev_ops);
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v4l2_set_subdevdata(&priv->subdev, p);
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priv->subdev.grp_id = (__u32)icd;
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strncpy(priv->subdev.name, dev_name(&pdev->dev), V4L2_SUBDEV_NAME_SIZE);
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ret = v4l2_device_register_subdev(&ici->v4l2_dev, &priv->subdev);
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if (ret)
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goto evdrs;
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return ret;
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evdrs:
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icd->ops = NULL;
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platform_set_drvdata(pdev, NULL);
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kfree(priv);
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return ret;
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}
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static int soc_camera_platform_remove(struct platform_device *pdev)
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{
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struct soc_camera_platform_priv *priv = get_priv(pdev);
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struct soc_camera_platform_info *p = pdev->dev.platform_data;
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struct soc_camera_device *icd = to_soc_camera_dev(p->dev);
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v4l2_device_unregister_subdev(&priv->subdev);
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icd->ops = NULL;
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platform_set_drvdata(pdev, NULL);
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kfree(priv);
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return 0;
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}
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static struct platform_driver soc_camera_platform_driver = {
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.driver = {
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.name = "soc_camera_platform",
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.owner = THIS_MODULE,
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},
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.probe = soc_camera_platform_probe,
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.remove = soc_camera_platform_remove,
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};
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static int __init soc_camera_platform_module_init(void)
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{
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return platform_driver_register(&soc_camera_platform_driver);
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}
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static void __exit soc_camera_platform_module_exit(void)
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{
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platform_driver_unregister(&soc_camera_platform_driver);
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}
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module_init(soc_camera_platform_module_init);
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module_exit(soc_camera_platform_module_exit);
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MODULE_DESCRIPTION("SoC Camera Platform driver");
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MODULE_AUTHOR("Magnus Damm");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:soc_camera_platform");
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