[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / media / video / sh_mobile_csi2.c

/*
 * Driver for the SH-Mobile MIPI CSI-2 unit
 *
 * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.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/delay.h>
#include <linux/i2c.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/videodev2.h>

#include <media/sh_mobile_csi2.h>
#include <media/soc_camera.h>
#include <media/v4l2-common.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-device.h>
#include <media/v4l2-mediabus.h>
#include <media/v4l2-subdev.h>

#define SH_CSI2_TREF	0x00
#define SH_CSI2_SRST	0x04
#define SH_CSI2_PHYCNT	0x08
#define SH_CSI2_CHKSUM	0x0C
#define SH_CSI2_VCDT	0x10

struct sh_csi2 {
	struct v4l2_subdev		subdev;
	struct list_head		list;
	struct notifier_block		notifier;
	unsigned int			irq;
	void __iomem			*base;
	struct platform_device		*pdev;
	struct sh_csi2_client_config	*client;
	unsigned long (*query_bus_param)(struct soc_camera_device *);
	int (*set_bus_param)(struct soc_camera_device *, unsigned long);
};

static int sh_csi2_try_fmt(struct v4l2_subdev *sd,
			   struct v4l2_mbus_framefmt *mf)
{
	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;

	if (mf->width > 8188)
		mf->width = 8188;
	else if (mf->width & 1)
		mf->width &= ~1;

	switch (pdata->type) {
	case SH_CSI2C:
		switch (mf->code) {
		case V4L2_MBUS_FMT_UYVY8_2X8:		/* YUV422 */
		case V4L2_MBUS_FMT_YUYV8_1_5X8:		/* YUV420 */
		case V4L2_MBUS_FMT_Y8_1X8:		/* RAW8 */
		case V4L2_MBUS_FMT_SBGGR8_1X8:
		case V4L2_MBUS_FMT_SGRBG8_1X8:
			break;
		default:
			/* All MIPI CSI-2 devices must support one of primary formats */
			mf->code = V4L2_MBUS_FMT_YUYV8_2X8;
		}
		break;
	case SH_CSI2I:
		switch (mf->code) {
		case V4L2_MBUS_FMT_Y8_1X8:		/* RAW8 */
		case V4L2_MBUS_FMT_SBGGR8_1X8:
		case V4L2_MBUS_FMT_SGRBG8_1X8:
		case V4L2_MBUS_FMT_SBGGR10_1X10:	/* RAW10 */
		case V4L2_MBUS_FMT_SBGGR12_1X12:	/* RAW12 */
			break;
		default:
			/* All MIPI CSI-2 devices must support one of primary formats */
			mf->code = V4L2_MBUS_FMT_SBGGR8_1X8;
		}
		break;
	}

	return 0;
}

/*
 * We have done our best in try_fmt to try and tell the sensor, which formats
 * we support. If now the configuration is unsuitable for us we can only
 * error out.
 */
static int sh_csi2_s_fmt(struct v4l2_subdev *sd,
			 struct v4l2_mbus_framefmt *mf)
{
	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
	u32 tmp = (priv->client->channel & 3) << 8;

	dev_dbg(sd->v4l2_dev->dev, "%s(%u)\n", __func__, mf->code);
	if (mf->width > 8188 || mf->width & 1)
		return -EINVAL;

	switch (mf->code) {
	case V4L2_MBUS_FMT_UYVY8_2X8:
		tmp |= 0x1e;	/* YUV422 8 bit */
		break;
	case V4L2_MBUS_FMT_YUYV8_1_5X8:
		tmp |= 0x18;	/* YUV420 8 bit */
		break;
	case V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE:
		tmp |= 0x21;	/* RGB555 */
		break;
	case V4L2_MBUS_FMT_RGB565_2X8_BE:
		tmp |= 0x22;	/* RGB565 */
		break;
	case V4L2_MBUS_FMT_Y8_1X8:
	case V4L2_MBUS_FMT_SBGGR8_1X8:
	case V4L2_MBUS_FMT_SGRBG8_1X8:
		tmp |= 0x2a;	/* RAW8 */
		break;
	default:
		return -EINVAL;
	}

	iowrite32(tmp, priv->base + SH_CSI2_VCDT);

	return 0;
}

static struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = {
	.s_mbus_fmt	= sh_csi2_s_fmt,
	.try_mbus_fmt	= sh_csi2_try_fmt,
};

static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops;

static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
	.core	= &sh_csi2_subdev_core_ops,
	.video	= &sh_csi2_subdev_video_ops,
};

static void sh_csi2_hwinit(struct sh_csi2 *priv)
{
	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
	__u32 tmp = 0x10; /* Enable MIPI CSI clock lane */

	/* Reflect registers immediately */
	iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
	/* reset CSI2 harware */
	iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
	udelay(5);
	iowrite32(0x00000000, priv->base + SH_CSI2_SRST);

	if (priv->client->lanes & 3)
		tmp |= priv->client->lanes & 3;
	else
		/* Default - both lanes */
		tmp |= 3;

	if (priv->client->phy == SH_CSI2_PHY_MAIN)
		tmp |= 0x8000;

	iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);

	tmp = 0;
	if (pdata->flags & SH_CSI2_ECC)
		tmp |= 2;
	if (pdata->flags & SH_CSI2_CRC)
		tmp |= 1;
	iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
}

static int sh_csi2_set_bus_param(struct soc_camera_device *icd,
				 unsigned long flags)
{
	return 0;
}

static unsigned long sh_csi2_query_bus_param(struct soc_camera_device *icd)
{
	struct soc_camera_link *icl = to_soc_camera_link(icd);
	const unsigned long flags = SOCAM_PCLK_SAMPLE_RISING |
		SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_HIGH |
		SOCAM_MASTER | SOCAM_DATAWIDTH_8 | SOCAM_DATA_ACTIVE_HIGH;

	return soc_camera_apply_sensor_flags(icl, flags);
}

static int sh_csi2_notify(struct notifier_block *nb,
			  unsigned long action, void *data)
{
	struct device *dev = data;
	struct soc_camera_device *icd = to_soc_camera_dev(dev);
	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev->parent);
	struct sh_csi2 *priv =
		container_of(nb, struct sh_csi2, notifier);
	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
	int ret, i;

	for (i = 0; i < pdata->num_clients; i++)
		if (&pdata->clients[i].pdev->dev == icd->pdev)
			break;

	dev_dbg(dev, "%s(%p): action = %lu, found #%d\n", __func__, dev, action, i);

	if (i == pdata->num_clients)
		return NOTIFY_DONE;

	switch (action) {
	case BUS_NOTIFY_BOUND_DRIVER:
		snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s%s",
			 dev_name(v4l2_dev->dev), ".mipi-csi");
		priv->subdev.grp_id = (long)icd;
		ret = v4l2_device_register_subdev(v4l2_dev, &priv->subdev);
		dev_dbg(dev, "%s(%p): ret(register_subdev) = %d\n", __func__, priv, ret);
		if (ret < 0)
			return NOTIFY_DONE;

		priv->client = pdata->clients + i;

		priv->set_bus_param		= icd->ops->set_bus_param;
		priv->query_bus_param		= icd->ops->query_bus_param;
		icd->ops->set_bus_param		= sh_csi2_set_bus_param;
		icd->ops->query_bus_param	= sh_csi2_query_bus_param;

		pm_runtime_get_sync(v4l2_get_subdevdata(&priv->subdev));

		sh_csi2_hwinit(priv);
		break;
	case BUS_NOTIFY_UNBIND_DRIVER:
		priv->client = NULL;

		/* Driver is about to be unbound */
		icd->ops->set_bus_param		= priv->set_bus_param;
		icd->ops->query_bus_param	= priv->query_bus_param;
		priv->set_bus_param		= NULL;
		priv->query_bus_param		= NULL;

		v4l2_device_unregister_subdev(&priv->subdev);

		pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
		break;
	}

	return NOTIFY_OK;
}

static __devinit int sh_csi2_probe(struct platform_device *pdev)
{
	struct resource *res;
	unsigned int irq;
	int ret;
	struct sh_csi2 *priv;
	/* Platform data specify the PHY, lanes, ECC, CRC */
	struct sh_csi2_pdata *pdata = pdev->dev.platform_data;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	/* Interrupt unused so far */
	irq = platform_get_irq(pdev, 0);

	if (!res || (int)irq <= 0 || !pdata) {
		dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
		return -ENODEV;
	}

	/* TODO: Add support for CSI2I. Careful: different register layout! */
	if (pdata->type != SH_CSI2C) {
		dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
		return -EINVAL;
	}

	priv = kzalloc(sizeof(struct sh_csi2), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->irq = irq;
	priv->notifier.notifier_call = sh_csi2_notify;

	/* We MUST attach after the MIPI sensor */
	ret = bus_register_notifier(&soc_camera_bus_type, &priv->notifier);
	if (ret < 0) {
		dev_err(&pdev->dev, "CSI2 cannot register notifier\n");
		goto ernotify;
	}

	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
		dev_err(&pdev->dev, "CSI2 register region already claimed\n");
		ret = -EBUSY;
		goto ereqreg;
	}

	priv->base = ioremap(res->start, resource_size(res));
	if (!priv->base) {
		ret = -ENXIO;
		dev_err(&pdev->dev, "Unable to ioremap CSI2 registers.\n");
		goto eremap;
	}

	priv->pdev = pdev;

	v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
	v4l2_set_subdevdata(&priv->subdev, &pdev->dev);

	platform_set_drvdata(pdev, priv);

	pm_runtime_enable(&pdev->dev);

	dev_dbg(&pdev->dev, "CSI2 probed.\n");

	return 0;

eremap:
	release_mem_region(res->start, resource_size(res));
ereqreg:
	bus_unregister_notifier(&soc_camera_bus_type, &priv->notifier);
ernotify:
	kfree(priv);

	return ret;
}

static __devexit int sh_csi2_remove(struct platform_device *pdev)
{
	struct sh_csi2 *priv = platform_get_drvdata(pdev);
	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	bus_unregister_notifier(&soc_camera_bus_type, &priv->notifier);
	pm_runtime_disable(&pdev->dev);
	iounmap(priv->base);
	release_mem_region(res->start, resource_size(res));
	platform_set_drvdata(pdev, NULL);
	kfree(priv);

	return 0;
}

static struct platform_driver __refdata sh_csi2_pdrv = {
	.remove  = __devexit_p(sh_csi2_remove),
	.driver  = {
		.name	= "sh-mobile-csi2",
		.owner	= THIS_MODULE,
	},
};

static int __init sh_csi2_init(void)
{
	return platform_driver_probe(&sh_csi2_pdrv, sh_csi2_probe);
}

static void __exit sh_csi2_exit(void)
{
	platform_driver_unregister(&sh_csi2_pdrv);
}

module_init(sh_csi2_init);
module_exit(sh_csi2_exit);

MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:sh-mobile-csi2");
Commit	Line	Data
077e2c10 GL	1	/*
	2	* Driver for the SH-Mobile MIPI CSI-2 unit
	3	*
	4	* Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/delay.h>
	12	#include <linux/i2c.h>
	13	#include <linux/io.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/pm_runtime.h>
	16	#include <linux/slab.h>
	17	#include <linux/videodev2.h>
	18
	19	#include <media/sh_mobile_csi2.h>
	20	#include <media/soc_camera.h>
	21	#include <media/v4l2-common.h>
	22	#include <media/v4l2-dev.h>
	23	#include <media/v4l2-device.h>
	24	#include <media/v4l2-mediabus.h>
	25	#include <media/v4l2-subdev.h>
	26
	27	#define SH_CSI2_TREF 0x00
	28	#define SH_CSI2_SRST 0x04
	29	#define SH_CSI2_PHYCNT 0x08
	30	#define SH_CSI2_CHKSUM 0x0C
	31	#define SH_CSI2_VCDT 0x10
	32
	33	struct sh_csi2 {
	34	struct v4l2_subdev subdev;
	35	struct list_head list;
	36	struct notifier_block notifier;
	37	unsigned int irq;
	38	void __iomem *base;
	39	struct platform_device *pdev;
	40	struct sh_csi2_client_config *client;
cb743930 GL	41	unsigned long (query_bus_param)(struct soc_camera_device );
cb743930 GL	42	int (set_bus_param)(struct soc_camera_device , unsigned long);
077e2c10 GL	43	};
	44
	45	static int sh_csi2_try_fmt(struct v4l2_subdev *sd,
	46	struct v4l2_mbus_framefmt *mf)
	47	{
	48	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
	49	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
	50
	51	if (mf->width > 8188)
	52	mf->width = 8188;
	53	else if (mf->width & 1)
	54	mf->width &= ~1;
	55
	56	switch (pdata->type) {
	57	case SH_CSI2C:
	58	switch (mf->code) {
	59	case V4L2_MBUS_FMT_UYVY8_2X8: /* YUV422 */
	60	case V4L2_MBUS_FMT_YUYV8_1_5X8: /* YUV420 */
07670433	61	case V4L2_MBUS_FMT_Y8_1X8: /* RAW8 */
077e2c10 GL	62	case V4L2_MBUS_FMT_SBGGR8_1X8:
	63	case V4L2_MBUS_FMT_SGRBG8_1X8:
	64	break;
	65	default:
	66	/* All MIPI CSI-2 devices must support one of primary formats */
	67	mf->code = V4L2_MBUS_FMT_YUYV8_2X8;
	68	}
	69	break;
	70	case SH_CSI2I:
	71	switch (mf->code) {
07670433	72	case V4L2_MBUS_FMT_Y8_1X8: /* RAW8 */
077e2c10 GL	73	case V4L2_MBUS_FMT_SBGGR8_1X8:
	74	case V4L2_MBUS_FMT_SGRBG8_1X8:
	75	case V4L2_MBUS_FMT_SBGGR10_1X10: /* RAW10 */
	76	case V4L2_MBUS_FMT_SBGGR12_1X12: /* RAW12 */
	77	break;
	78	default:
	79	/* All MIPI CSI-2 devices must support one of primary formats */
	80	mf->code = V4L2_MBUS_FMT_SBGGR8_1X8;
	81	}
	82	break;
	83	}
	84
	85	return 0;
	86	}
	87
	88	/*
	89	* We have done our best in try_fmt to try and tell the sensor, which formats
	90	* we support. If now the configuration is unsuitable for us we can only
	91	* error out.
	92	*/
	93	static int sh_csi2_s_fmt(struct v4l2_subdev *sd,
	94	struct v4l2_mbus_framefmt *mf)
	95	{
	96	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
	97	u32 tmp = (priv->client->channel & 3) << 8;
	98
	99	dev_dbg(sd->v4l2_dev->dev, "%s(%u)\n", __func__, mf->code);
	100	if (mf->width > 8188 \|\| mf->width & 1)
	101	return -EINVAL;
	102
	103	switch (mf->code) {
	104	case V4L2_MBUS_FMT_UYVY8_2X8:
	105	tmp \|= 0x1e; /* YUV422 8 bit */
	106	break;
	107	case V4L2_MBUS_FMT_YUYV8_1_5X8:
	108	tmp \|= 0x18; /* YUV420 8 bit */
	109	break;
	110	case V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE:
	111	tmp \|= 0x21; /* RGB555 */
	112	break;
	113	case V4L2_MBUS_FMT_RGB565_2X8_BE:
	114	tmp \|= 0x22; /* RGB565 */
	115	break;
07670433	116	case V4L2_MBUS_FMT_Y8_1X8:
077e2c10 GL	117	case V4L2_MBUS_FMT_SBGGR8_1X8:
	118	case V4L2_MBUS_FMT_SGRBG8_1X8:
	119	tmp \|= 0x2a; /* RAW8 */
	120	break;
	121	default:
	122	return -EINVAL;
	123	}
	124
	125	iowrite32(tmp, priv->base + SH_CSI2_VCDT);
	126
	127	return 0;
	128	}
	129
	130	static struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = {
	131	.s_mbus_fmt = sh_csi2_s_fmt,
	132	.try_mbus_fmt = sh_csi2_try_fmt,
	133	};
	134
	135	static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops;
	136
	137	static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
	138	.core = &sh_csi2_subdev_core_ops,
	139	.video = &sh_csi2_subdev_video_ops,
	140	};
	141
	142	static void sh_csi2_hwinit(struct sh_csi2 *priv)
	143	{
	144	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
	145	__u32 tmp = 0x10; /* Enable MIPI CSI clock lane */
	146
	147	/* Reflect registers immediately */
	148	iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
	149	/* reset CSI2 harware */
	150	iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
	151	udelay(5);
	152	iowrite32(0x00000000, priv->base + SH_CSI2_SRST);
	153
	154	if (priv->client->lanes & 3)
	155	tmp \|= priv->client->lanes & 3;
	156	else
	157	/* Default - both lanes */
	158	tmp \|= 3;
	159
	160	if (priv->client->phy == SH_CSI2_PHY_MAIN)
	161	tmp \|= 0x8000;
	162
	163	iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);
	164
	165	tmp = 0;
	166	if (pdata->flags & SH_CSI2_ECC)
	167	tmp \|= 2;
	168	if (pdata->flags & SH_CSI2_CRC)
	169	tmp \|= 1;
	170	iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
	171	}
	172
	173	static int sh_csi2_set_bus_param(struct soc_camera_device *icd,
	174	unsigned long flags)
	175	{
	176	return 0;
	177	}
	178
	179	static unsigned long sh_csi2_query_bus_param(struct soc_camera_device *icd)
	180	{
181	struct soc_camera_link *icl = to_soc_camera_link(icd);
182	const unsigned long flags = SOCAM_PCLK_SAMPLE_RISING \|
183	SOCAM_HSYNC_ACTIVE_HIGH \| SOCAM_VSYNC_ACTIVE_HIGH \|
184	SOCAM_MASTER \| SOCAM_DATAWIDTH_8 \| SOCAM_DATA_ACTIVE_HIGH;
185
186	return soc_camera_apply_sensor_flags(icl, flags);
187	}
188
189	static int sh_csi2_notify(struct notifier_block *nb,
190	unsigned long action, void *data)
191	{
192	struct device *dev = data;
193	struct soc_camera_device *icd = to_soc_camera_dev(dev);
194	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev->parent);
195	struct sh_csi2 *priv =
196	container_of(nb, struct sh_csi2, notifier);
197	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
198	int ret, i;
199
200	for (i = 0; i < pdata->num_clients; i++)
201	if (&pdata->clients[i].pdev->dev == icd->pdev)
202	break;
203
204	dev_dbg(dev, "%s(%p): action = %lu, found #%d\n", __func__, dev, action, i);
205
206	if (i == pdata->num_clients)
207	return NOTIFY_DONE;
208
209	switch (action) {
210	case BUS_NOTIFY_BOUND_DRIVER:
211	snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s%s",
212	dev_name(v4l2_dev->dev), ".mipi-csi");
24105ebc	213	priv->subdev.grp_id = (long)icd;
077e2c10 GL	214	ret = v4l2_device_register_subdev(v4l2_dev, &priv->subdev);
	215	dev_dbg(dev, "%s(%p): ret(register_subdev) = %d\n", __func__, priv, ret);
	216	if (ret < 0)
	217	return NOTIFY_DONE;
	218
	219	priv->client = pdata->clients + i;
	220
cb743930 GL	221	priv->set_bus_param = icd->ops->set_bus_param;
cb743930 GL	222	priv->query_bus_param = icd->ops->query_bus_param;
077e2c10 GL	223	icd->ops->set_bus_param = sh_csi2_set_bus_param;
	224	icd->ops->query_bus_param = sh_csi2_query_bus_param;
	225
	226	pm_runtime_get_sync(v4l2_get_subdevdata(&priv->subdev));
	227
	228	sh_csi2_hwinit(priv);
	229	break;
	230	case BUS_NOTIFY_UNBIND_DRIVER:
	231	priv->client = NULL;
	232
	233	/* Driver is about to be unbound */
cb743930 GL	234	icd->ops->set_bus_param = priv->set_bus_param;
	235	icd->ops->query_bus_param = priv->query_bus_param;
	236	priv->set_bus_param = NULL;
	237	priv->query_bus_param = NULL;
077e2c10 GL	238
	239	v4l2_device_unregister_subdev(&priv->subdev);
	240
	241	pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
	242	break;
	243	}
	244
	245	return NOTIFY_OK;
	246	}
	247
	248	static __devinit int sh_csi2_probe(struct platform_device *pdev)
	249	{
	250	struct resource *res;
	251	unsigned int irq;
	252	int ret;
	253	struct sh_csi2 *priv;
	254	/* Platform data specify the PHY, lanes, ECC, CRC */
	255	struct sh_csi2_pdata *pdata = pdev->dev.platform_data;
	256
	257	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	258	/* Interrupt unused so far */
	259	irq = platform_get_irq(pdev, 0);
	260
	261	if (!res \|\| (int)irq <= 0 \|\| !pdata) {
	262	dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
	263	return -ENODEV;
	264	}
	265
	266	/* TODO: Add support for CSI2I. Careful: different register layout! */
	267	if (pdata->type != SH_CSI2C) {
	268	dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
	269	return -EINVAL;
	270	}
	271
	272	priv = kzalloc(sizeof(struct sh_csi2), GFP_KERNEL);
	273	if (!priv)
	274	return -ENOMEM;
	275
	276	priv->irq = irq;
	277	priv->notifier.notifier_call = sh_csi2_notify;
	278
	279	/* We MUST attach after the MIPI sensor */
	280	ret = bus_register_notifier(&soc_camera_bus_type, &priv->notifier);
	281	if (ret < 0) {
	282	dev_err(&pdev->dev, "CSI2 cannot register notifier\n");
	283	goto ernotify;
	284	}
	285
	286	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
	287	dev_err(&pdev->dev, "CSI2 register region already claimed\n");
	288	ret = -EBUSY;
	289	goto ereqreg;
	290	}
	291
	292	priv->base = ioremap(res->start, resource_size(res));
	293	if (!priv->base) {
	294	ret = -ENXIO;
	295	dev_err(&pdev->dev, "Unable to ioremap CSI2 registers.\n");
	296	goto eremap;
	297	}
	298
	299	priv->pdev = pdev;
	300
	301	v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
302	v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
303
304	platform_set_drvdata(pdev, priv);
305
306	pm_runtime_enable(&pdev->dev);
307
308	dev_dbg(&pdev->dev, "CSI2 probed.\n");
309
310	return 0;
311
312	eremap:
313	release_mem_region(res->start, resource_size(res));
314	ereqreg:
315	bus_unregister_notifier(&soc_camera_bus_type, &priv->notifier);
316	ernotify:
317	kfree(priv);
318
319	return ret;
320	}
321
322	static __devexit int sh_csi2_remove(struct platform_device *pdev)
323	{
324	struct sh_csi2 *priv = platform_get_drvdata(pdev);
325	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
326
327	bus_unregister_notifier(&soc_camera_bus_type, &priv->notifier);
328	pm_runtime_disable(&pdev->dev);
329	iounmap(priv->base);
330	release_mem_region(res->start, resource_size(res));
331	platform_set_drvdata(pdev, NULL);
332	kfree(priv);
333
334	return 0;
335	}
336
337	static struct platform_driver __refdata sh_csi2_pdrv = {
338	.remove = __devexit_p(sh_csi2_remove),
339	.driver = {
340	.name = "sh-mobile-csi2",
341	.owner = THIS_MODULE,
342	},
343	};
344
345	static int __init sh_csi2_init(void)
346	{
347	return platform_driver_probe(&sh_csi2_pdrv, sh_csi2_probe);
348	}
349
350	static void __exit sh_csi2_exit(void)
351	{
352	platform_driver_unregister(&sh_csi2_pdrv);
353	}
354
355	module_init(sh_csi2_init);
356	module_exit(sh_csi2_exit);
357
358	MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
359	MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
360	MODULE_LICENSE("GPL v2");
361	MODULE_ALIAS("platform:sh-mobile-csi2");