[deliverable/linux.git] / drivers / media / video / mt9m001.c

/*
 * Driver for MT9M001 CMOS Image Sensor from Micron
 *
 * 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/videodev2.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/log2.h>

#include <media/v4l2-common.h>
#include <media/v4l2-chip-ident.h>
#include <media/soc_camera.h>

#ifdef CONFIG_MT9M001_PCA9536_SWITCH
#include <asm/gpio.h>
#endif

/* mt9m001 i2c address 0x5d
 * The platform has to define i2c_board_info
 * and call i2c_register_board_info() */

/* mt9m001 selected register addresses */
#define MT9M001_CHIP_VERSION		0x00
#define MT9M001_ROW_START		0x01
#define MT9M001_COLUMN_START		0x02
#define MT9M001_WINDOW_HEIGHT		0x03
#define MT9M001_WINDOW_WIDTH		0x04
#define MT9M001_HORIZONTAL_BLANKING	0x05
#define MT9M001_VERTICAL_BLANKING	0x06
#define MT9M001_OUTPUT_CONTROL		0x07
#define MT9M001_SHUTTER_WIDTH		0x09
#define MT9M001_FRAME_RESTART		0x0b
#define MT9M001_SHUTTER_DELAY		0x0c
#define MT9M001_RESET			0x0d
#define MT9M001_READ_OPTIONS1		0x1e
#define MT9M001_READ_OPTIONS2		0x20
#define MT9M001_GLOBAL_GAIN		0x35
#define MT9M001_CHIP_ENABLE		0xF1

static const struct soc_camera_data_format mt9m001_colour_formats[] = {
	{
		.name		= "RGB Bayer (sRGB)",
		.depth		= 16,
		.fourcc		= V4L2_PIX_FMT_SBGGR8,
		.colorspace	= V4L2_COLORSPACE_SRGB,
	}
};

static const struct soc_camera_data_format mt9m001_monochrome_formats[] = {
	{
		.name		= "Monochrome 10 bit",
		.depth		= 10,
		.fourcc		= V4L2_PIX_FMT_Y16,
	}, {
		.name		= "Monochrome 8 bit",
		.depth		= 8,
		.fourcc		= V4L2_PIX_FMT_GREY,
	},
};

struct mt9m001 {
	struct i2c_client *client;
	struct soc_camera_device icd;
	int model;	/* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
	int switch_gpio;
	unsigned char autoexposure;
	unsigned char datawidth;
};

static int reg_read(struct soc_camera_device *icd, const u8 reg)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	struct i2c_client *client = mt9m001->client;
	s32 data = i2c_smbus_read_word_data(client, reg);
	return data < 0 ? data : swab16(data);
}

static int reg_write(struct soc_camera_device *icd, const u8 reg,
		     const u16 data)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	return i2c_smbus_write_word_data(mt9m001->client, reg, swab16(data));
}

static int reg_set(struct soc_camera_device *icd, const u8 reg,
		   const u16 data)
{
	int ret;

	ret = reg_read(icd, reg);
	if (ret < 0)
		return ret;
	return reg_write(icd, reg, ret | data);
}

static int reg_clear(struct soc_camera_device *icd, const u8 reg,
		     const u16 data)
{
	int ret;

	ret = reg_read(icd, reg);
	if (ret < 0)
		return ret;
	return reg_write(icd, reg, ret & ~data);
}

static int mt9m001_init(struct soc_camera_device *icd)
{
	int ret;

	/* Disable chip, synchronous option update */
	dev_dbg(icd->vdev->dev, "%s\n", __FUNCTION__);

	ret = reg_write(icd, MT9M001_RESET, 1);
	if (ret >= 0)
		ret = reg_write(icd, MT9M001_RESET, 0);
	if (ret >= 0)
		ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);

	return ret >= 0 ? 0 : -EIO;
}

static int mt9m001_release(struct soc_camera_device *icd)
{
	/* Disable the chip */
	reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
	return 0;
}

static int mt9m001_start_capture(struct soc_camera_device *icd)
{
	/* Switch to master "normal" mode */
	if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0)
		return -EIO;
	return 0;
}

static int mt9m001_stop_capture(struct soc_camera_device *icd)
{
	/* Stop sensor readout */
	if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0)
		return -EIO;
	return 0;
}

static int bus_switch_request(struct mt9m001 *mt9m001,
			      struct soc_camera_link *icl)
{
#ifdef CONFIG_MT9M001_PCA9536_SWITCH
	int ret;
	unsigned int gpio = icl->gpio;

	if (gpio_is_valid(gpio)) {
		/* We have a data bus switch. */
		ret = gpio_request(gpio, "mt9m001");
		if (ret < 0) {
			dev_err(&mt9m001->client->dev, "Cannot get GPIO %u\n",
				gpio);
			return ret;
		}

		ret = gpio_direction_output(gpio, 0);
		if (ret < 0) {
			dev_err(&mt9m001->client->dev,
				"Cannot set GPIO %u to output\n", gpio);
			gpio_free(gpio);
			return ret;
		}
	}

	mt9m001->switch_gpio = gpio;
#else
	mt9m001->switch_gpio = -EINVAL;
#endif
	return 0;
}

static void bus_switch_release(struct mt9m001 *mt9m001)
{
#ifdef CONFIG_MT9M001_PCA9536_SWITCH
	if (gpio_is_valid(mt9m001->switch_gpio))
		gpio_free(mt9m001->switch_gpio);
#endif
}

static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit)
{
#ifdef CONFIG_MT9M001_PCA9536_SWITCH
	if (!gpio_is_valid(mt9m001->switch_gpio))
		return -ENODEV;

	gpio_set_value_cansleep(mt9m001->switch_gpio, go8bit);
	return 0;
#else
	return -ENODEV;
#endif
}

static int mt9m001_set_capture_format(struct soc_camera_device *icd,
		__u32 pixfmt, struct v4l2_rect *rect, unsigned int flags)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	unsigned int width_flag = flags & (IS_DATAWIDTH_10 | IS_DATAWIDTH_9 |
					   IS_DATAWIDTH_8);
	int ret;
	const u16 hblank = 9, vblank = 25;

	/* MT9M001 has all capture_format parameters fixed */
	if (!(flags & IS_MASTER) ||
	    !(flags & IS_PCLK_SAMPLE_RISING) ||
	    !(flags & IS_HSYNC_ACTIVE_HIGH) ||
	    !(flags & IS_VSYNC_ACTIVE_HIGH))
		return -EINVAL;

	/* Only one width bit may be set */
	if (!is_power_of_2(width_flag))
		return -EINVAL;

	if ((mt9m001->datawidth != 10 && (width_flag == IS_DATAWIDTH_10)) ||
	    (mt9m001->datawidth != 9  && (width_flag == IS_DATAWIDTH_9)) ||
	    (mt9m001->datawidth != 8  && (width_flag == IS_DATAWIDTH_8))) {
		/* Well, we actually only can do 10 or 8 bits... */
		if (width_flag == IS_DATAWIDTH_9)
			return -EINVAL;
		ret = bus_switch_act(mt9m001,
				     width_flag == IS_DATAWIDTH_8);
		if (ret < 0)
			return ret;

		mt9m001->datawidth = width_flag == IS_DATAWIDTH_8 ? 8 : 10;
	}

	/* Blanking and start values - default... */
	ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank);
	if (ret >= 0)
		ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank);

	/* The caller provides a supported format, as verified per
	 * call to icd->try_fmt_cap() */
	if (ret >= 0)
		ret = reg_write(icd, MT9M001_COLUMN_START, rect->left);
	if (ret >= 0)
		ret = reg_write(icd, MT9M001_ROW_START, rect->top);
	if (ret >= 0)
		ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1);
	if (ret >= 0)
		ret = reg_write(icd, MT9M001_WINDOW_HEIGHT,
				rect->height + icd->y_skip_top - 1);
	if (ret >= 0 && mt9m001->autoexposure) {
		ret = reg_write(icd, MT9M001_SHUTTER_WIDTH,
				rect->height + icd->y_skip_top + vblank);
		if (ret >= 0) {
			const struct v4l2_queryctrl *qctrl =
				soc_camera_find_qctrl(icd->ops,
						      V4L2_CID_EXPOSURE);
			icd->exposure = (524 + (rect->height + icd->y_skip_top +
						vblank - 1) *
					 (qctrl->maximum - qctrl->minimum)) /
				1048 + qctrl->minimum;
		}
	}

	return ret < 0 ? ret : 0;
}

static int mt9m001_try_fmt_cap(struct soc_camera_device *icd,
			       struct v4l2_format *f)
{
	if (f->fmt.pix.height < 32 + icd->y_skip_top)
		f->fmt.pix.height = 32 + icd->y_skip_top;
	if (f->fmt.pix.height > 1024 + icd->y_skip_top)
		f->fmt.pix.height = 1024 + icd->y_skip_top;
	if (f->fmt.pix.width < 48)
		f->fmt.pix.width = 48;
	if (f->fmt.pix.width > 1280)
		f->fmt.pix.width = 1280;
	f->fmt.pix.width &= ~0x01; /* has to be even, unsure why was ~3 */

	return 0;
}

static int mt9m001_get_chip_id(struct soc_camera_device *icd,
			       struct v4l2_chip_ident *id)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);

	if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR)
		return -EINVAL;

	if (id->match_chip != mt9m001->client->addr)
		return -ENODEV;

	id->ident	= mt9m001->model;
	id->revision	= 0;

	return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int mt9m001_get_register(struct soc_camera_device *icd,
				struct v4l2_register *reg)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);

	if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
		return -EINVAL;

	if (reg->match_chip != mt9m001->client->addr)
		return -ENODEV;

	reg->val = reg_read(icd, reg->reg);

	if (reg->val > 0xffff)
		return -EIO;

	return 0;
}

static int mt9m001_set_register(struct soc_camera_device *icd,
				struct v4l2_register *reg)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);

	if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR || reg->reg > 0xff)
		return -EINVAL;

	if (reg->match_chip != mt9m001->client->addr)
		return -ENODEV;

	if (reg_write(icd, reg->reg, reg->val) < 0)
		return -EIO;

	return 0;
}
#endif

static unsigned int mt9m001_get_datawidth(struct soc_camera_device *icd)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	return mt9m001->datawidth;
}

const struct v4l2_queryctrl mt9m001_controls[] = {
	{
		.id		= V4L2_CID_VFLIP,
		.type		= V4L2_CTRL_TYPE_BOOLEAN,
		.name		= "Flip Vertically",
		.minimum	= 0,
		.maximum	= 1,
		.step		= 1,
		.default_value	= 0,
	}, {
		.id		= V4L2_CID_GAIN,
		.type		= V4L2_CTRL_TYPE_INTEGER,
		.name		= "Gain",
		.minimum	= 0,
		.maximum	= 127,
		.step		= 1,
		.default_value	= 64,
		.flags		= V4L2_CTRL_FLAG_SLIDER,
	}, {
		.id		= V4L2_CID_EXPOSURE,
		.type		= V4L2_CTRL_TYPE_INTEGER,
		.name		= "Exposure",
		.minimum	= 1,
		.maximum	= 255,
		.step		= 1,
		.default_value	= 255,
		.flags		= V4L2_CTRL_FLAG_SLIDER,
	}, {
		.id		= V4L2_CID_EXPOSURE_AUTO,
		.type		= V4L2_CTRL_TYPE_BOOLEAN,
		.name		= "Automatic Exposure",
		.minimum	= 0,
		.maximum	= 1,
		.step		= 1,
		.default_value	= 1,
	}
};

static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl);
static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl);

static struct soc_camera_ops mt9m001_ops = {
	.owner			= THIS_MODULE,
	.init			= mt9m001_init,
	.release		= mt9m001_release,
	.start_capture		= mt9m001_start_capture,
	.stop_capture		= mt9m001_stop_capture,
	.set_capture_format	= mt9m001_set_capture_format,
	.try_fmt_cap		= mt9m001_try_fmt_cap,
	.formats		= NULL, /* Filled in later depending on the */
	.num_formats		= 0,	/* camera type and data widths */
	.get_datawidth		= mt9m001_get_datawidth,
	.controls		= mt9m001_controls,
	.num_controls		= ARRAY_SIZE(mt9m001_controls),
	.get_control		= mt9m001_get_control,
	.set_control		= mt9m001_set_control,
	.get_chip_id		= mt9m001_get_chip_id,
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.get_register		= mt9m001_get_register,
	.set_register		= mt9m001_set_register,
#endif
};

static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	int data;

	switch (ctrl->id) {
	case V4L2_CID_VFLIP:
		data = reg_read(icd, MT9M001_READ_OPTIONS2);
		if (data < 0)
			return -EIO;
		ctrl->value = !!(data & 0x8000);
		break;
	case V4L2_CID_EXPOSURE_AUTO:
		ctrl->value = mt9m001->autoexposure;
		break;
	}
	return 0;
}

static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	const struct v4l2_queryctrl *qctrl;
	int data;

	qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id);

	if (!qctrl)
		return -EINVAL;

	switch (ctrl->id) {
	case V4L2_CID_VFLIP:
		if (ctrl->value)
			data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000);
		else
			data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000);
		if (data < 0)
			return -EIO;
		break;
	case V4L2_CID_GAIN:
		if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
			return -EINVAL;
		/* See Datasheet Table 7, Gain settings. */
		if (ctrl->value <= qctrl->default_value) {
			/* Pack it into 0..1 step 0.125, register values 0..8 */
			unsigned long range = qctrl->default_value - qctrl->minimum;
			data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;

			dev_dbg(&icd->dev, "Setting gain %d\n", data);
			data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
			if (data < 0)
				return -EIO;
		} else {
			/* Pack it into 1.125..15 variable step, register values 9..67 */
			/* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
			unsigned long range = qctrl->maximum - qctrl->default_value - 1;
			unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
					       111 + range / 2) / range + 9;

			if (gain <= 32)
				data = gain;
			else if (gain <= 64)
				data = ((gain - 32) * 16 + 16) / 32 + 80;
			else
				data = ((gain - 64) * 7 + 28) / 56 + 96;

			dev_dbg(&icd->dev, "Setting gain from %d to %d\n",
				 reg_read(icd, MT9M001_GLOBAL_GAIN), data);
			data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
			if (data < 0)
				return -EIO;
		}

		/* Success */
		icd->gain = ctrl->value;
		break;
	case V4L2_CID_EXPOSURE:
		/* mt9m001 has maximum == default */
		if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
			return -EINVAL;
		else {
			unsigned long range = qctrl->maximum - qctrl->minimum;
			unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 +
						 range / 2) / range + 1;

			dev_dbg(&icd->dev, "Setting shutter width from %d to %lu\n",
				 reg_read(icd, MT9M001_SHUTTER_WIDTH), shutter);
			if (reg_write(icd, MT9M001_SHUTTER_WIDTH, shutter) < 0)
				return -EIO;
			icd->exposure = ctrl->value;
			mt9m001->autoexposure = 0;
		}
		break;
	case V4L2_CID_EXPOSURE_AUTO:
		if (ctrl->value) {
			const u16 vblank = 25;
			if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height +
				      icd->y_skip_top + vblank) < 0)
				return -EIO;
			qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
			icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) *
					 (qctrl->maximum - qctrl->minimum)) /
				1048 + qctrl->minimum;
			mt9m001->autoexposure = 1;
		} else
			mt9m001->autoexposure = 0;
		break;
	}
	return 0;
}

/* Interface active, can use i2c. If it fails, it can indeed mean, that
 * this wasn't our capture interface, so, we wait for the right one */
static int mt9m001_video_probe(struct soc_camera_device *icd)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	s32 data;
	int ret;

	/* We must have a parent by now. And it cannot be a wrong one.
	 * So this entire test is completely redundant. */
	if (!icd->dev.parent ||
	    to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
		return -ENODEV;

	/* Enable the chip */
	data = reg_write(&mt9m001->icd, MT9M001_CHIP_ENABLE, 1);
	dev_dbg(&icd->dev, "write: %d\n", data);

	/* Read out the chip version register */
	data = reg_read(icd, MT9M001_CHIP_VERSION);

	/* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
	switch (data) {
	case 0x8411:
	case 0x8421:
		mt9m001->model = V4L2_IDENT_MT9M001C12ST;
		mt9m001_ops.formats = mt9m001_colour_formats;
		mt9m001_ops.num_formats = ARRAY_SIZE(mt9m001_colour_formats);
		break;
	case 0x8431:
		mt9m001->model = V4L2_IDENT_MT9M001C12STM;
		mt9m001_ops.formats = mt9m001_monochrome_formats;
		if (mt9m001->client->dev.platform_data)
			mt9m001_ops.num_formats = ARRAY_SIZE(mt9m001_monochrome_formats);
		else
			mt9m001_ops.num_formats = 1;
		break;
	default:
		ret = -ENODEV;
		dev_err(&icd->dev,
			"No MT9M001 chip detected, register read %x\n", data);
		goto ei2c;
	}

	dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
		 data == 0x8431 ? "C12STM" : "C12ST");

	/* Now that we know the model, we can start video */
	ret = soc_camera_video_start(icd);
	if (ret)
		goto eisis;

	return 0;

eisis:
ei2c:
	return ret;
}

static void mt9m001_video_remove(struct soc_camera_device *icd)
{
	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);

	dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr,
		mt9m001->icd.dev.parent, mt9m001->icd.vdev);
	soc_camera_video_stop(&mt9m001->icd);
}

static int mt9m001_probe(struct i2c_client *client)
{
	struct mt9m001 *mt9m001;
	struct soc_camera_device *icd;
	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
	struct soc_camera_link *icl = client->dev.platform_data;
	int ret;

	if (!icl) {
		dev_err(&client->dev, "MT9M001 driver needs platform data\n");
		return -EINVAL;
	}

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
		dev_warn(&adapter->dev,
			 "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
		return -EIO;
	}

	mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL);
	if (!mt9m001)
		return -ENOMEM;

	mt9m001->client = client;
	i2c_set_clientdata(client, mt9m001);

	/* Second stage probe - when a capture adapter is there */
	icd = &mt9m001->icd;
	icd->probe	= mt9m001_video_probe;
	icd->remove	= mt9m001_video_remove;
	icd->ops	= &mt9m001_ops;
	icd->control	= &client->dev;
	icd->x_min	= 20;
	icd->y_min	= 12;
	icd->x_current	= 20;
	icd->y_current	= 12;
	icd->width_min	= 48;
	icd->width_max	= 1280;
	icd->height_min	= 32;
	icd->height_max	= 1024;
	icd->y_skip_top	= 1;
	icd->iface	= icl->bus_id;
	/* Default datawidth - this is the only width this camera (normally)
	 * supports. It is only with extra logic that it can support
	 * other widths. Therefore it seems to be a sensible default. */
	mt9m001->datawidth = 10;
	/* Simulated autoexposure. If enabled, we calculate shutter width
	 * ourselves in the driver based on vertical blanking and frame width */
	mt9m001->autoexposure = 1;

	ret = bus_switch_request(mt9m001, icl);
	if (ret)
		goto eswinit;

	ret = soc_camera_device_register(icd);
	if (ret)
		goto eisdr;

	return 0;

eisdr:
	bus_switch_release(mt9m001);
eswinit:
	kfree(mt9m001);
	return ret;
}

static int mt9m001_remove(struct i2c_client *client)
{
	struct mt9m001 *mt9m001 = i2c_get_clientdata(client);

	soc_camera_device_unregister(&mt9m001->icd);
	bus_switch_release(mt9m001);
	kfree(mt9m001);

	return 0;
}

static struct i2c_driver mt9m001_i2c_driver = {
	.driver = {
		.name = "mt9m001",
	},
	.probe		= mt9m001_probe,
	.remove		= mt9m001_remove,
};

static int __init mt9m001_mod_init(void)
{
	return i2c_add_driver(&mt9m001_i2c_driver);
}

static void __exit mt9m001_mod_exit(void)
{
	i2c_del_driver(&mt9m001_i2c_driver);
}

module_init(mt9m001_mod_init);
module_exit(mt9m001_mod_exit);

MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
MODULE_LICENSE("GPL");
Commit	Line	Data
f523dd0d GL	1	/*
	2	* Driver for MT9M001 CMOS Image Sensor from Micron
	3	*
	4	* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.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/videodev2.h>
	12	#include <linux/slab.h>
	13	#include <linux/i2c.h>
	14	#include <linux/log2.h>
	15
	16	#include <media/v4l2-common.h>
	17	#include <media/v4l2-chip-ident.h>
	18	#include <media/soc_camera.h>
	19
ef6ad5c3	20	#ifdef CONFIG_MT9M001_PCA9536_SWITCH
f523dd0d	21	#include <asm/gpio.h>
ef6ad5c3	22	#endif
f523dd0d GL	23
	24	/* mt9m001 i2c address 0x5d
	25	* The platform has to define i2c_board_info
	26	* and call i2c_register_board_info() */
	27
	28	/* mt9m001 selected register addresses */
	29	#define MT9M001_CHIP_VERSION 0x00
	30	#define MT9M001_ROW_START 0x01
	31	#define MT9M001_COLUMN_START 0x02
	32	#define MT9M001_WINDOW_HEIGHT 0x03
	33	#define MT9M001_WINDOW_WIDTH 0x04
	34	#define MT9M001_HORIZONTAL_BLANKING 0x05
	35	#define MT9M001_VERTICAL_BLANKING 0x06
	36	#define MT9M001_OUTPUT_CONTROL 0x07
	37	#define MT9M001_SHUTTER_WIDTH 0x09
	38	#define MT9M001_FRAME_RESTART 0x0b
	39	#define MT9M001_SHUTTER_DELAY 0x0c
	40	#define MT9M001_RESET 0x0d
	41	#define MT9M001_READ_OPTIONS1 0x1e
	42	#define MT9M001_READ_OPTIONS2 0x20
	43	#define MT9M001_GLOBAL_GAIN 0x35
	44	#define MT9M001_CHIP_ENABLE 0xF1
	45
	46	static const struct soc_camera_data_format mt9m001_colour_formats[] = {
	47	{
	48	.name = "RGB Bayer (sRGB)",
	49	.depth = 16,
	50	.fourcc = V4L2_PIX_FMT_SBGGR8,
	51	.colorspace = V4L2_COLORSPACE_SRGB,
	52	}
	53	};
	54
	55	static const struct soc_camera_data_format mt9m001_monochrome_formats[] = {
	56	{
	57	.name = "Monochrome 10 bit",
	58	.depth = 10,
	59	.fourcc = V4L2_PIX_FMT_Y16,
	60	}, {
	61	.name = "Monochrome 8 bit",
	62	.depth = 8,
	63	.fourcc = V4L2_PIX_FMT_GREY,
	64	},
	65	};
	66
	67	struct mt9m001 {
	68	struct i2c_client *client;
	69	struct soc_camera_device icd;
	70	int model; /* V4L2_IDENT_MT9M001* codes from v4l2-chip-ident.h */
	71	int switch_gpio;
	72	unsigned char autoexposure;
	73	unsigned char datawidth;
	74	};
	75
	76	static int reg_read(struct soc_camera_device *icd, const u8 reg)
	77	{
	78	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	79	struct i2c_client *client = mt9m001->client;
	80	s32 data = i2c_smbus_read_word_data(client, reg);
	81	return data < 0 ? data : swab16(data);
	82	}
	83
	84	static int reg_write(struct soc_camera_device *icd, const u8 reg,
	85	const u16 data)
	86	{
87	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
88	return i2c_smbus_write_word_data(mt9m001->client, reg, swab16(data));
89	}
90
91	static int reg_set(struct soc_camera_device *icd, const u8 reg,
92	const u16 data)
93	{
94	int ret;
95
96	ret = reg_read(icd, reg);
97	if (ret < 0)
98	return ret;
99	return reg_write(icd, reg, ret \| data);
100	}
101
102	static int reg_clear(struct soc_camera_device *icd, const u8 reg,
103	const u16 data)
104	{
105	int ret;
106
107	ret = reg_read(icd, reg);
108	if (ret < 0)
109	return ret;
110	return reg_write(icd, reg, ret & ~data);
111	}
112
113	static int mt9m001_init(struct soc_camera_device *icd)
114	{
115	int ret;
116
117	/* Disable chip, synchronous option update */
118	dev_dbg(icd->vdev->dev, "%s\n", __FUNCTION__);
119
120	ret = reg_write(icd, MT9M001_RESET, 1);
121	if (ret >= 0)
122	ret = reg_write(icd, MT9M001_RESET, 0);
123	if (ret >= 0)
124	ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
125
126	return ret >= 0 ? 0 : -EIO;
127	}
128
129	static int mt9m001_release(struct soc_camera_device *icd)
130	{
131	/* Disable the chip */
132	reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
133	return 0;
134	}
135
136	static int mt9m001_start_capture(struct soc_camera_device *icd)
137	{
138	/* Switch to master "normal" mode */
139	if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0)
140	return -EIO;
141	return 0;
142	}
143
144	static int mt9m001_stop_capture(struct soc_camera_device *icd)
145	{
146	/* Stop sensor readout */
147	if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0)
148	return -EIO;
149	return 0;
150	}
151
152	static int bus_switch_request(struct mt9m001 *mt9m001,
153	struct soc_camera_link *icl)
154	{
155	#ifdef CONFIG_MT9M001_PCA9536_SWITCH
156	int ret;
157	unsigned int gpio = icl->gpio;
158
b4333a3b	159	if (gpio_is_valid(gpio)) {
f523dd0d GL	160	/* We have a data bus switch. */
	161	ret = gpio_request(gpio, "mt9m001");
	162	if (ret < 0) {
	163	dev_err(&mt9m001->client->dev, "Cannot get GPIO %u\n",
	164	gpio);
	165	return ret;
	166	}
	167
	168	ret = gpio_direction_output(gpio, 0);
	169	if (ret < 0) {
	170	dev_err(&mt9m001->client->dev,
	171	"Cannot set GPIO %u to output\n", gpio);
	172	gpio_free(gpio);
	173	return ret;
	174	}
	175	}
	176
	177	mt9m001->switch_gpio = gpio;
	178	#else
b4333a3b	179	mt9m001->switch_gpio = -EINVAL;
f523dd0d GL	180	#endif
	181	return 0;
	182	}
	183
	184	static void bus_switch_release(struct mt9m001 *mt9m001)
	185	{
	186	#ifdef CONFIG_MT9M001_PCA9536_SWITCH
b4333a3b	187	if (gpio_is_valid(mt9m001->switch_gpio))
f523dd0d GL	188	gpio_free(mt9m001->switch_gpio);
	189	#endif
	190	}
	191
	192	static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit)
	193	{
	194	#ifdef CONFIG_MT9M001_PCA9536_SWITCH
b4333a3b	195	if (!gpio_is_valid(mt9m001->switch_gpio))
f523dd0d GL	196	return -ENODEV;
	197
	198	gpio_set_value_cansleep(mt9m001->switch_gpio, go8bit);
	199	return 0;
	200	#else
	201	return -ENODEV;
	202	#endif
	203	}
	204
	205	static int mt9m001_set_capture_format(struct soc_camera_device *icd,
	206	__u32 pixfmt, struct v4l2_rect *rect, unsigned int flags)
	207	{
	208	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
	209	unsigned int width_flag = flags & (IS_DATAWIDTH_10 \| IS_DATAWIDTH_9 \|
	210	IS_DATAWIDTH_8);
	211	int ret;
	212	const u16 hblank = 9, vblank = 25;
	213
	214	/* MT9M001 has all capture_format parameters fixed */
	215	if (!(flags & IS_MASTER) \|\|
	216	!(flags & IS_PCLK_SAMPLE_RISING) \|\|
	217	!(flags & IS_HSYNC_ACTIVE_HIGH) \|\|
	218	!(flags & IS_VSYNC_ACTIVE_HIGH))
	219	return -EINVAL;
	220
	221	/* Only one width bit may be set */
	222	if (!is_power_of_2(width_flag))
	223	return -EINVAL;
	224
	225	if ((mt9m001->datawidth != 10 && (width_flag == IS_DATAWIDTH_10)) \|\|
	226	(mt9m001->datawidth != 9 && (width_flag == IS_DATAWIDTH_9)) \|\|
	227	(mt9m001->datawidth != 8 && (width_flag == IS_DATAWIDTH_8))) {
f523dd0d GL	228	/* Well, we actually only can do 10 or 8 bits... */
	229	if (width_flag == IS_DATAWIDTH_9)
	230	return -EINVAL;
	231	ret = bus_switch_act(mt9m001,
	232	width_flag == IS_DATAWIDTH_8);
	233	if (ret < 0)
	234	return ret;
	235
	236	mt9m001->datawidth = width_flag == IS_DATAWIDTH_8 ? 8 : 10;
	237	}
	238
	239	/* Blanking and start values - default... */
	240	ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank);
	241	if (ret >= 0)
	242	ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank);
	243
	244	/* The caller provides a supported format, as verified per
	245	* call to icd->try_fmt_cap() */
	246	if (ret >= 0)
	247	ret = reg_write(icd, MT9M001_COLUMN_START, rect->left);
	248	if (ret >= 0)
	249	ret = reg_write(icd, MT9M001_ROW_START, rect->top);
	250	if (ret >= 0)
	251	ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1);
	252	if (ret >= 0)
	253	ret = reg_write(icd, MT9M001_WINDOW_HEIGHT,
	254	rect->height + icd->y_skip_top - 1);
	255	if (ret >= 0 && mt9m001->autoexposure) {
	256	ret = reg_write(icd, MT9M001_SHUTTER_WIDTH,
	257	rect->height + icd->y_skip_top + vblank);
	258	if (ret >= 0) {
	259	const struct v4l2_queryctrl *qctrl =
	260	soc_camera_find_qctrl(icd->ops,
	261	V4L2_CID_EXPOSURE);
	262	icd->exposure = (524 + (rect->height + icd->y_skip_top +
	263	vblank - 1) *
	264	(qctrl->maximum - qctrl->minimum)) /
	265	1048 + qctrl->minimum;
	266	}
	267	}
	268
	269	return ret < 0 ? ret : 0;
	270	}
	271
	272	static int mt9m001_try_fmt_cap(struct soc_camera_device *icd,
	273	struct v4l2_format *f)
	274	{
	275	if (f->fmt.pix.height < 32 + icd->y_skip_top)
	276	f->fmt.pix.height = 32 + icd->y_skip_top;
	277	if (f->fmt.pix.height > 1024 + icd->y_skip_top)
	278	f->fmt.pix.height = 1024 + icd->y_skip_top;
	279	if (f->fmt.pix.width < 48)
	280	f->fmt.pix.width = 48;
	281	if (f->fmt.pix.width > 1280)
	282	f->fmt.pix.width = 1280;
	283	f->fmt.pix.width &= ~0x01; /* has to be even, unsure why was ~3 */
	284
	285	return 0;
	286	}
	287
	288	static int mt9m001_get_chip_id(struct soc_camera_device *icd,
	289	struct v4l2_chip_ident *id)
	290	{
	291	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
292
293	if (id->match_type != V4L2_CHIP_MATCH_I2C_ADDR)
294	return -EINVAL;
295
296	if (id->match_chip != mt9m001->client->addr)
297	return -ENODEV;
298
299	id->ident = mt9m001->model;
300	id->revision = 0;
301
302	return 0;
303	}
304
305	#ifdef CONFIG_VIDEO_ADV_DEBUG
306	static int mt9m001_get_register(struct soc_camera_device *icd,
307	struct v4l2_register *reg)
308	{
309	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
310
311	if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR \|\| reg->reg > 0xff)
312	return -EINVAL;
313
314	if (reg->match_chip != mt9m001->client->addr)
315	return -ENODEV;
316
317	reg->val = reg_read(icd, reg->reg);
318
319	if (reg->val > 0xffff)
320	return -EIO;
321
322	return 0;
323	}
324
325	static int mt9m001_set_register(struct soc_camera_device *icd,
326	struct v4l2_register *reg)
327	{
328	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
329
330	if (reg->match_type != V4L2_CHIP_MATCH_I2C_ADDR \|\| reg->reg > 0xff)
331	return -EINVAL;
332
333	if (reg->match_chip != mt9m001->client->addr)
334	return -ENODEV;
335
336	if (reg_write(icd, reg->reg, reg->val) < 0)
337	return -EIO;
338
339	return 0;
340	}
341	#endif
342
343	static unsigned int mt9m001_get_datawidth(struct soc_camera_device *icd)
344	{
345	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
346	return mt9m001->datawidth;
347	}
348
349	const struct v4l2_queryctrl mt9m001_controls[] = {
350	{
351	.id = V4L2_CID_VFLIP,
352	.type = V4L2_CTRL_TYPE_BOOLEAN,
353	.name = "Flip Vertically",
354	.minimum = 0,
355	.maximum = 1,
356	.step = 1,
357	.default_value = 0,
358	}, {
359	.id = V4L2_CID_GAIN,
360	.type = V4L2_CTRL_TYPE_INTEGER,
361	.name = "Gain",
362	.minimum = 0,
363	.maximum = 127,
364	.step = 1,
365	.default_value = 64,
366	.flags = V4L2_CTRL_FLAG_SLIDER,
367	}, {
368	.id = V4L2_CID_EXPOSURE,
369	.type = V4L2_CTRL_TYPE_INTEGER,
370	.name = "Exposure",
371	.minimum = 1,
372	.maximum = 255,
373	.step = 1,
374	.default_value = 255,
375	.flags = V4L2_CTRL_FLAG_SLIDER,
376	}, {
377	.id = V4L2_CID_EXPOSURE_AUTO,
378	.type = V4L2_CTRL_TYPE_BOOLEAN,
379	.name = "Automatic Exposure",
380	.minimum = 0,
381	.maximum = 1,
382	.step = 1,
383	.default_value = 1,
384	}
385	};
386
387	static int mt9m001_get_control(struct soc_camera_device icd, struct v4l2_control ctrl);
388	static int mt9m001_set_control(struct soc_camera_device icd, struct v4l2_control ctrl);
389
390	static struct soc_camera_ops mt9m001_ops = {
391	.owner = THIS_MODULE,
392	.init = mt9m001_init,
393	.release = mt9m001_release,
394	.start_capture = mt9m001_start_capture,
395	.stop_capture = mt9m001_stop_capture,
396	.set_capture_format = mt9m001_set_capture_format,
397	.try_fmt_cap = mt9m001_try_fmt_cap,
398	.formats = NULL, /* Filled in later depending on the */
399	.num_formats = 0, /* camera type and data widths */
400	.get_datawidth = mt9m001_get_datawidth,
401	.controls = mt9m001_controls,
402	.num_controls = ARRAY_SIZE(mt9m001_controls),
403	.get_control = mt9m001_get_control,
404	.set_control = mt9m001_set_control,
405	.get_chip_id = mt9m001_get_chip_id,
406	#ifdef CONFIG_VIDEO_ADV_DEBUG
407	.get_register = mt9m001_get_register,
408	.set_register = mt9m001_set_register,
409	#endif
410	};
411
412	static int mt9m001_get_control(struct soc_camera_device icd, struct v4l2_control ctrl)
413	{
414	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
415	int data;
416
417	switch (ctrl->id) {
418	case V4L2_CID_VFLIP:
419	data = reg_read(icd, MT9M001_READ_OPTIONS2);
420	if (data < 0)
421	return -EIO;
422	ctrl->value = !!(data & 0x8000);
423	break;
424	case V4L2_CID_EXPOSURE_AUTO:
425	ctrl->value = mt9m001->autoexposure;
426	break;
427	}
428	return 0;
429	}
430
431	static int mt9m001_set_control(struct soc_camera_device icd, struct v4l2_control ctrl)
432	{
433	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
434	const struct v4l2_queryctrl *qctrl;
435	int data;
436
437	qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id);
438
439	if (!qctrl)
440	return -EINVAL;
441
442	switch (ctrl->id) {
443	case V4L2_CID_VFLIP:
444	if (ctrl->value)
445	data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000);
446	else
447	data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000);
448	if (data < 0)
449	return -EIO;
450	break;
451	case V4L2_CID_GAIN:
452	if (ctrl->value > qctrl->maximum \|\| ctrl->value < qctrl->minimum)
453	return -EINVAL;
454	/* See Datasheet Table 7, Gain settings. */
455	if (ctrl->value <= qctrl->default_value) {
456	/* Pack it into 0..1 step 0.125, register values 0..8 */
457	unsigned long range = qctrl->default_value - qctrl->minimum;
458	data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
459
460	dev_dbg(&icd->dev, "Setting gain %d\n", data);
461	data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
462	if (data < 0)
463	return -EIO;
464	} else {
465	/* Pack it into 1.125..15 variable step, register values 9..67 */
466	/* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
467	unsigned long range = qctrl->maximum - qctrl->default_value - 1;
468	unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
469	111 + range / 2) / range + 9;
470
471	if (gain <= 32)
472	data = gain;
473	else if (gain <= 64)
474	data = ((gain - 32) * 16 + 16) / 32 + 80;
475	else
476	data = ((gain - 64) * 7 + 28) / 56 + 96;
477
478	dev_dbg(&icd->dev, "Setting gain from %d to %d\n",
479	reg_read(icd, MT9M001_GLOBAL_GAIN), data);
480	data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
481	if (data < 0)
482	return -EIO;
483	}
484
485	/* Success */
486	icd->gain = ctrl->value;
487	break;
488	case V4L2_CID_EXPOSURE:
489	/* mt9m001 has maximum == default */
490	if (ctrl->value > qctrl->maximum \|\| ctrl->value < qctrl->minimum)
491	return -EINVAL;
492	else {
493	unsigned long range = qctrl->maximum - qctrl->minimum;
494	unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 +
495	range / 2) / range + 1;
496
497	dev_dbg(&icd->dev, "Setting shutter width from %d to %lu\n",
498	reg_read(icd, MT9M001_SHUTTER_WIDTH), shutter);
499	if (reg_write(icd, MT9M001_SHUTTER_WIDTH, shutter) < 0)
500	return -EIO;
501	icd->exposure = ctrl->value;
502	mt9m001->autoexposure = 0;
503	}
504	break;
505	case V4L2_CID_EXPOSURE_AUTO:
506	if (ctrl->value) {
507	const u16 vblank = 25;
508	if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height +
509	icd->y_skip_top + vblank) < 0)
510	return -EIO;
511	qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
512	icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) *
513	(qctrl->maximum - qctrl->minimum)) /
514	1048 + qctrl->minimum;
515	mt9m001->autoexposure = 1;
516	} else
517	mt9m001->autoexposure = 0;
518	break;
519	}
520	return 0;
521	}
522
523	/* Interface active, can use i2c. If it fails, it can indeed mean, that
524	* this wasn't our capture interface, so, we wait for the right one */
525	static int mt9m001_video_probe(struct soc_camera_device *icd)
526	{
527	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
528	s32 data;
529	int ret;
530
531	/* We must have a parent by now. And it cannot be a wrong one.
532	* So this entire test is completely redundant. */
533	if (!icd->dev.parent \|\|
534	to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
535	return -ENODEV;
536
537	/* Enable the chip */
538	data = reg_write(&mt9m001->icd, MT9M001_CHIP_ENABLE, 1);
539	dev_dbg(&icd->dev, "write: %d\n", data);
540
541	/* Read out the chip version register */
542	data = reg_read(icd, MT9M001_CHIP_VERSION);
543
544	/* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
545	switch (data) {
546	case 0x8411:
547	case 0x8421:
548	mt9m001->model = V4L2_IDENT_MT9M001C12ST;
549	mt9m001_ops.formats = mt9m001_colour_formats;
550	mt9m001_ops.num_formats = ARRAY_SIZE(mt9m001_colour_formats);
551	break;
552	case 0x8431:
553	mt9m001->model = V4L2_IDENT_MT9M001C12STM;
554	mt9m001_ops.formats = mt9m001_monochrome_formats;
555	if (mt9m001->client->dev.platform_data)
556	mt9m001_ops.num_formats = ARRAY_SIZE(mt9m001_monochrome_formats);
557	else
558	mt9m001_ops.num_formats = 1;
559	break;
560	default:
561	ret = -ENODEV;
562	dev_err(&icd->dev,
563	"No MT9M001 chip detected, register read %x\n", data);
564	goto ei2c;
565	}
566
567	dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
568	data == 0x8431 ? "C12STM" : "C12ST");
569
570	/* Now that we know the model, we can start video */
571	ret = soc_camera_video_start(icd);
572	if (ret)
573	goto eisis;
574
575	return 0;
576
577	eisis:
578	ei2c:
579	return ret;
580	}
581
582	static void mt9m001_video_remove(struct soc_camera_device *icd)
583	{
584	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
585
586	dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr,
587	mt9m001->icd.dev.parent, mt9m001->icd.vdev);
588	soc_camera_video_stop(&mt9m001->icd);
589	}
590
591	static int mt9m001_probe(struct i2c_client *client)
592	{
593	struct mt9m001 *mt9m001;
594	struct soc_camera_device *icd;
595	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
596	struct soc_camera_link *icl = client->dev.platform_data;
597	int ret;
598
599	if (!icl) {
600	dev_err(&client->dev, "MT9M001 driver needs platform data\n");
601	return -EINVAL;
602	}
603
604	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
605	dev_warn(&adapter->dev,
606	"I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
607	return -EIO;
608	}
609
610	mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL);
611	if (!mt9m001)
612	return -ENOMEM;
613
614	mt9m001->client = client;
615	i2c_set_clientdata(client, mt9m001);
616
617	/* Second stage probe - when a capture adapter is there */
618	icd = &mt9m001->icd;
619	icd->probe = mt9m001_video_probe;
620	icd->remove = mt9m001_video_remove;
621	icd->ops = &mt9m001_ops;
622	icd->control = &client->dev;
623	icd->x_min = 20;
624	icd->y_min = 12;
625	icd->x_current = 20;
626	icd->y_current = 12;
627	icd->width_min = 48;
628	icd->width_max = 1280;
629	icd->height_min = 32;
630	icd->height_max = 1024;
631	icd->y_skip_top = 1;
632	icd->iface = icl->bus_id;
633	/* Default datawidth - this is the only width this camera (normally)
634	* supports. It is only with extra logic that it can support
635	* other widths. Therefore it seems to be a sensible default. */
636	mt9m001->datawidth = 10;
637	/* Simulated autoexposure. If enabled, we calculate shutter width
638	* ourselves in the driver based on vertical blanking and frame width */
639	mt9m001->autoexposure = 1;
640
641	ret = bus_switch_request(mt9m001, icl);
642	if (ret)
643	goto eswinit;
644
645	ret = soc_camera_device_register(icd);
646	if (ret)
647	goto eisdr;
648
649	return 0;
650
651	eisdr:
652	bus_switch_release(mt9m001);
653	eswinit:
654	kfree(mt9m001);
655	return ret;
656	}
657
658	static int mt9m001_remove(struct i2c_client *client)
659	{
660	struct mt9m001 *mt9m001 = i2c_get_clientdata(client);
661
662	soc_camera_device_unregister(&mt9m001->icd);
663	bus_switch_release(mt9m001);
664	kfree(mt9m001);
665
666	return 0;
667	}
668
669	static struct i2c_driver mt9m001_i2c_driver = {
670	.driver = {
671	.name = "mt9m001",
672	},
673	.probe = mt9m001_probe,
674	.remove = mt9m001_remove,
675	};
676
677	static int __init mt9m001_mod_init(void)
678	{
679	return i2c_add_driver(&mt9m001_i2c_driver);
680	}
681
682	static void __exit mt9m001_mod_exit(void)
683	{
684	i2c_del_driver(&mt9m001_i2c_driver);
685	}
686
687	module_init(mt9m001_mod_init);
688	module_exit(mt9m001_mod_exit);
689
690	MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
691	MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
692	MODULE_LICENSE("GPL");