[deliverable/linux.git] / drivers / media / video / soc_camera_platform.c

/*
 * Generic Platform Camera Driver
 *
 * Copyright (C) 2008 Magnus Damm
 * Based on mt9m001 driver,
 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/videodev2.h>
#include <media/v4l2-subdev.h>
#include <media/soc_camera.h>
#include <media/soc_camera_platform.h>

struct soc_camera_platform_priv {
	struct v4l2_subdev subdev;
};

static struct soc_camera_platform_priv *get_priv(struct platform_device *pdev)
{
	struct v4l2_subdev *subdev = platform_get_drvdata(pdev);
	return container_of(subdev, struct soc_camera_platform_priv, subdev);
}

static struct soc_camera_platform_info *get_info(struct soc_camera_device *icd)
{
	struct platform_device *pdev =
		to_platform_device(to_soc_camera_control(icd));
	return pdev->dev.platform_data;
}

static int soc_camera_platform_s_stream(struct v4l2_subdev *sd, int enable)
{
	struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
	return p->set_capture(p, enable);
}

static int soc_camera_platform_set_bus_param(struct soc_camera_device *icd,
					     unsigned long flags)
{
	return 0;
}

static unsigned long
soc_camera_platform_query_bus_param(struct soc_camera_device *icd)
{
	struct soc_camera_platform_info *p = get_info(icd);
	return p->bus_param;
}

static int soc_camera_platform_try_fmt(struct v4l2_subdev *sd,
				       struct v4l2_mbus_framefmt *mf)
{
	struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);

	mf->width	= p->format.width;
	mf->height	= p->format.height;
	mf->code	= p->format.code;
	mf->colorspace	= p->format.colorspace;

	return 0;
}

static struct v4l2_subdev_core_ops platform_subdev_core_ops;

static int soc_camera_platform_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
					enum v4l2_mbus_pixelcode *code)
{
	struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);

	if (index)
		return -EINVAL;

	*code = p->format.code;
	return 0;
}

static struct v4l2_subdev_video_ops platform_subdev_video_ops = {
	.s_stream	= soc_camera_platform_s_stream,
	.try_mbus_fmt	= soc_camera_platform_try_fmt,
	.enum_mbus_fmt	= soc_camera_platform_enum_fmt,
};

static struct v4l2_subdev_ops platform_subdev_ops = {
	.core	= &platform_subdev_core_ops,
	.video	= &platform_subdev_video_ops,
};

static struct soc_camera_ops soc_camera_platform_ops = {
	.set_bus_param		= soc_camera_platform_set_bus_param,
	.query_bus_param	= soc_camera_platform_query_bus_param,
};

static int soc_camera_platform_probe(struct platform_device *pdev)
{
	struct soc_camera_host *ici;
	struct soc_camera_platform_priv *priv;
	struct soc_camera_platform_info *p = pdev->dev.platform_data;
	struct soc_camera_device *icd;
	int ret;

	if (!p)
		return -EINVAL;

	if (!p->dev) {
		dev_err(&pdev->dev,
			"Platform has not set soc_camera_device pointer!\n");
		return -EINVAL;
	}

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	icd = to_soc_camera_dev(p->dev);

	/* soc-camera convention: control's drvdata points to the subdev */
	platform_set_drvdata(pdev, &priv->subdev);
	/* Set the control device reference */
	dev_set_drvdata(&icd->dev, &pdev->dev);

	icd->ops = &soc_camera_platform_ops;

	ici = to_soc_camera_host(icd->dev.parent);

	v4l2_subdev_init(&priv->subdev, &platform_subdev_ops);
	v4l2_set_subdevdata(&priv->subdev, p);
	strncpy(priv->subdev.name, dev_name(&pdev->dev), V4L2_SUBDEV_NAME_SIZE);

	ret = v4l2_device_register_subdev(&ici->v4l2_dev, &priv->subdev);
	if (ret)
		goto evdrs;

	return ret;

evdrs:
	icd->ops = NULL;
	platform_set_drvdata(pdev, NULL);
	kfree(priv);
	return ret;
}

static int soc_camera_platform_remove(struct platform_device *pdev)
{
	struct soc_camera_platform_priv *priv = get_priv(pdev);
	struct soc_camera_platform_info *p = pdev->dev.platform_data;
	struct soc_camera_device *icd = to_soc_camera_dev(p->dev);

	v4l2_device_unregister_subdev(&priv->subdev);
	icd->ops = NULL;
	platform_set_drvdata(pdev, NULL);
	kfree(priv);
	return 0;
}

static struct platform_driver soc_camera_platform_driver = {
	.driver 	= {
		.name	= "soc_camera_platform",
		.owner	= THIS_MODULE,
	},
	.probe		= soc_camera_platform_probe,
	.remove		= soc_camera_platform_remove,
};

static int __init soc_camera_platform_module_init(void)
{
	return platform_driver_register(&soc_camera_platform_driver);
}

static void __exit soc_camera_platform_module_exit(void)
{
	platform_driver_unregister(&soc_camera_platform_driver);
}

module_init(soc_camera_platform_module_init);
module_exit(soc_camera_platform_module_exit);

MODULE_DESCRIPTION("SoC Camera Platform driver");
MODULE_AUTHOR("Magnus Damm");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:soc_camera_platform");
Commit	Line	Data
	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 struct soc_camera_platform_info get_info(struct soc_camera_device icd)
	34	{
	35	struct platform_device *pdev =
	36	to_platform_device(to_soc_camera_control(icd));
	37	return pdev->dev.platform_data;
	38	}
	39
	40	static int soc_camera_platform_s_stream(struct v4l2_subdev *sd, int enable)
	41	{
	42	struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
	43	return p->set_capture(p, enable);
	44	}
	45
	46	static int soc_camera_platform_set_bus_param(struct soc_camera_device *icd,
	47	unsigned long flags)
	48	{
	49	return 0;
	50	}
	51
	52	static unsigned long
	53	soc_camera_platform_query_bus_param(struct soc_camera_device *icd)
	54	{
	55	struct soc_camera_platform_info *p = get_info(icd);
	56	return p->bus_param;
	57	}
	58
	59	static int soc_camera_platform_try_fmt(struct v4l2_subdev *sd,
	60	struct v4l2_mbus_framefmt *mf)
	61	{
	62	struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
	63
	64	mf->width = p->format.width;
	65	mf->height = p->format.height;
	66	mf->code = p->format.code;
	67	mf->colorspace = p->format.colorspace;
	68
	69	return 0;
	70	}
	71
	72	static struct v4l2_subdev_core_ops platform_subdev_core_ops;
	73
	74	static int soc_camera_platform_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
	75	enum v4l2_mbus_pixelcode *code)
	76	{
	77	struct soc_camera_platform_info *p = v4l2_get_subdevdata(sd);
	78
	79	if (index)
	80	return -EINVAL;
	81
	82	*code = p->format.code;
	83	return 0;
	84	}
	85
	86	static struct v4l2_subdev_video_ops platform_subdev_video_ops = {
	87	.s_stream = soc_camera_platform_s_stream,
	88	.try_mbus_fmt = soc_camera_platform_try_fmt,
	89	.enum_mbus_fmt = soc_camera_platform_enum_fmt,
	90	};
	91
	92	static struct v4l2_subdev_ops platform_subdev_ops = {
	93	.core = &platform_subdev_core_ops,
	94	.video = &platform_subdev_video_ops,
	95	};
	96
	97	static struct soc_camera_ops soc_camera_platform_ops = {
	98	.set_bus_param = soc_camera_platform_set_bus_param,
	99	.query_bus_param = soc_camera_platform_query_bus_param,
	100	};
	101
	102	static int soc_camera_platform_probe(struct platform_device *pdev)
	103	{
	104	struct soc_camera_host *ici;
	105	struct soc_camera_platform_priv *priv;
	106	struct soc_camera_platform_info *p = pdev->dev.platform_data;
	107	struct soc_camera_device *icd;
	108	int ret;
	109
	110	if (!p)
	111	return -EINVAL;
	112
	113	if (!p->dev) {
	114	dev_err(&pdev->dev,
	115	"Platform has not set soc_camera_device pointer!\n");
	116	return -EINVAL;
	117	}
	118
	119	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	120	if (!priv)
	121	return -ENOMEM;
	122
	123	icd = to_soc_camera_dev(p->dev);
	124
	125	/* soc-camera convention: control's drvdata points to the subdev */
	126	platform_set_drvdata(pdev, &priv->subdev);
	127	/* Set the control device reference */
	128	dev_set_drvdata(&icd->dev, &pdev->dev);
	129
	130	icd->ops = &soc_camera_platform_ops;
	131
	132	ici = to_soc_camera_host(icd->dev.parent);
	133
	134	v4l2_subdev_init(&priv->subdev, &platform_subdev_ops);
	135	v4l2_set_subdevdata(&priv->subdev, p);
	136	strncpy(priv->subdev.name, dev_name(&pdev->dev), V4L2_SUBDEV_NAME_SIZE);
	137
	138	ret = v4l2_device_register_subdev(&ici->v4l2_dev, &priv->subdev);
	139	if (ret)
	140	goto evdrs;
	141
	142	return ret;
	143
	144	evdrs:
	145	icd->ops = NULL;
	146	platform_set_drvdata(pdev, NULL);
	147	kfree(priv);
	148	return ret;
	149	}
	150
	151	static int soc_camera_platform_remove(struct platform_device *pdev)
	152	{
	153	struct soc_camera_platform_priv *priv = get_priv(pdev);
	154	struct soc_camera_platform_info *p = pdev->dev.platform_data;
	155	struct soc_camera_device *icd = to_soc_camera_dev(p->dev);
	156
	157	v4l2_device_unregister_subdev(&priv->subdev);
	158	icd->ops = NULL;
	159	platform_set_drvdata(pdev, NULL);
	160	kfree(priv);
	161	return 0;
	162	}
	163
	164	static struct platform_driver soc_camera_platform_driver = {
	165	.driver = {
	166	.name = "soc_camera_platform",
	167	.owner = THIS_MODULE,
	168	},
	169	.probe = soc_camera_platform_probe,
	170	.remove = soc_camera_platform_remove,
	171	};
	172
	173	static int __init soc_camera_platform_module_init(void)
	174	{
	175	return platform_driver_register(&soc_camera_platform_driver);
	176	}
	177
	178	static void __exit soc_camera_platform_module_exit(void)
	179	{
	180	platform_driver_unregister(&soc_camera_platform_driver);
	181	}
	182
	183	module_init(soc_camera_platform_module_init);
	184	module_exit(soc_camera_platform_module_exit);
	185
	186	MODULE_DESCRIPTION("SoC Camera Platform driver");
	187	MODULE_AUTHOR("Magnus Damm");
	188	MODULE_LICENSE("GPL v2");
	189	MODULE_ALIAS("platform:soc_camera_platform");