[linux-2.6-block.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>

#include <asm/gpio.h>

/* 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 != NO_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 = NO_GPIO;
#endif
	return 0;
}

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

static int bus_switch_act(struct mt9m001 *mt9m001, int go8bit)
{
#ifdef CONFIG_MT9M001_PCA9536_SWITCH
	if (mt9m001->switch_gpio == NO_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))) {
		/* data width switch requested */
		if (mt9m001->switch_gpio == NO_GPIO)
			return -EINVAL;

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