Subject: [RFC PATCH 5/8] Add support for the MT9V022 camera
From: Guennadi Liakhovetski <[email-masked]>
To: [email-masked]
Date: Wed, 23 Jan 2008 18:41:55 +0100 (CET)
Newsgroups: gmane.comp.video.video4linux
List-Id: Linux and Kernel Video <video4linux-list.redhat.com>

This driver supports Micron MT9V022 colour camera.

Signed-off-by: Guennadi Liakhovetski <[email-masked]>
---
 drivers/media/video/Kconfig   |   14 +
 drivers/media/video/Makefile  |    1 +
 drivers/media/video/mt9v022.c |  751 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 766 insertions(+), 0 deletions(-)
 create mode 100644 drivers/media/video/mt9v022.c

diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index def5246..1359f8f 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -818,6 +818,20 @@ config MT9M001_PCA9536_SWITCH
 	  Select this if your MT9M001 camera uses a PCA9536 I2C GPIO
 	  extender to switch between 8 and 10 bit datawidth modes
 
+config SOC_CAMERA_MT9V022
+	tristate "mt9v022 support"
+	depends on SOC_CAMERA
+	select SENSORS_PCA9536 if MT9V022_PCA9536_SWITCH
+	help
+	  This driver supports MT9V022 cameras from Micron
+
+config MT9V022_PCA9536_SWITCH
+	bool "pca9536 datawidth switch for mt9v022"
+	depends on SOC_CAMERA_MT9V022
+	help
+	  Select this if your MT9V022 camera uses a PCA9536 I2C GPIO
+	  extender to switch between 8 and 10 bit datawidth modes
+
 config VIDEO_PXA27X
 	tristate "PXA27x Quick Capture Interface driver"
 	depends on VIDEO_DEV && PXA27x
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index c56bfdb..6eaf0ad 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -119,5 +119,6 @@ obj-$(CONFIG_VIDEO_VIVI) += vivi.o
 obj-$(CONFIG_VIDEO_PXA27X)	+= pxa_camera.o
 obj-$(CONFIG_SOC_CAMERA)	+= soc_camera.o
 obj-$(CONFIG_SOC_CAMERA_MT9M001)	+= mt9m001.o
+obj-$(CONFIG_SOC_CAMERA_MT9V022)	+= mt9v022.o
 
 EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core
diff --git a/drivers/media/video/mt9v022.c b/drivers/media/video/mt9v022.c
new file mode 100644
index 0000000..d13b965
--- /dev/null
+++ b/drivers/media/video/mt9v022.c
@@ -0,0 +1,751 @@
+/*
+ * Driver for MT9V022 CMOS Image Sensor from Micron
+ *
+ * Copyright (C) 2008, Guennadi Liakhovetski <[email-masked]>
+ *
+ * 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/videodev.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/log2.h>
+
+#include <media/v4l2-common.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/soc_camera.h>
+
+/* mt9v022 i2c address 0x48, 0x4c, 0x58, 0x5c
+ * The platform has to define i2c_board_info
+ * and call i2c_register_board_info() */
+
+static char *sensor_type;
+module_param(sensor_type, charp, S_IRUGO);
+MODULE_PARM_DESC(sensor_type, "Sensor type: \"colour\" or \"monochrome\"\n");
+
+/* mt9v022 selected register addresses */
+#define MT9V022_CHIP_VERSION		0x00
+#define MT9V022_COLUMN_START		0x01
+#define MT9V022_ROW_START		0x02
+#define MT9V022_WINDOW_HEIGHT		0x03
+#define MT9V022_WINDOW_WIDTH		0x04
+#define MT9V022_HORIZONTAL_BLANKING	0x05
+#define MT9V022_VERTICAL_BLANKING	0x06
+#define MT9V022_CHIP_CONTROL		0x07
+#define MT9V022_SHUTTER_WIDTH1		0x08
+#define MT9V022_SHUTTER_WIDTH2		0x09
+#define MT9V022_SHUTTER_WIDTH_CTRL	0x0a
+#define MT9V022_TOTAL_SHUTTER_WIDTH	0x0b
+#define MT9V022_RESET			0x0c
+#define MT9V022_READ_MODE		0x0d
+#define MT9V022_MONITOR_MODE		0x0e
+#define MT9V022_PIXEL_OPERATION_MODE	0x0f
+#define MT9V022_LED_OUT_CONTROL		0x1b
+#define MT9V022_ADC_MODE_CONTROL	0x1c
+#define MT9V022_ANALOG_GAIN		0x34
+#define MT9V022_BLACK_LEVEL_CALIB_CTRL	0x47
+#define MT9V022_PIXCLK_FV_LV		0x74
+#define MT9V022_DIGITAL_TEST_PATTERN	0x7f
+#define MT9V022_AEC_AGC_ENABLE		0xAF
+#define MT9V022_MAX_TOTAL_SHUTTER_WIDTH	0xBD
+
+/* Progressive scan, master, defaults */
+#define MT9V022_CHIP_CONTROL_DEFAULT	0x188
+
+/* must be 32 bit, bitwise coded by reg_to_int and int_to_reg below */
+struct reg_access {
+	u16	value;
+	u8	address;
+	u8	rw;
+} __attribute__ ((packed));
+
+union reg_access_32 {
+	struct reg_access	reg;
+	u32			ctrl;
+};
+
+enum reg_rw { REG_READ = 0, REG_WRITE = 1, };
+
+/*
+#define reg_to_int(rw, address, value) ({			\
+	union reg_access_32 u = {.reg = {value, address, rw}};	\
+	u.i32;							\
+})
+*/
+
+/* rw has to be numerically most significant, because
+ * maximum, minimum and value are signed */
+#ifdef __LITTLE_ENDIAN
+#define reg_to_int(rw, address, value) (((value) & 0xffff) | (((address) & 0xff) << 16) | (((rw) & 0x7f) << 24))
+#else
+#define reg_to_int(rw, address, value) ((((value) & 0xffff) << 16) | (((address) & 0xff) << 8) | ((rw) & 0x7f))
+#endif
+
+static const struct soc_camera_data_format mt9v022_formats[]= {
+	{
+		.name		= "RGB Bayer (sRGB)",
+		.depth		= 8,
+		.fourcc		= V4L2_PIX_FMT_SBGGR8,
+		.colorspace	= V4L2_COLORSPACE_SRGB,
+	}, {
+		.name		= "RGB Bayer (sRGB)",
+		.depth		= 10,
+		.fourcc		= V4L2_PIX_FMT_SBGGR16,
+		.colorspace	= V4L2_COLORSPACE_SRGB,
+	}, {
+		.name		= "Monochrome 10 bit",
+		.depth		= 10,
+		.fourcc		= V4L2_PIX_FMT_Y16,
+	}, {
+		.name		= "Monochrome 8 bit",
+		.depth		= 8,
+		.fourcc		= V4L2_PIX_FMT_GREY,
+	},
+};
+
+enum mt9v022_sensor {
+	MT9V022_SENSOR_MONOCHROME,
+	MT9V022_SENSOR_COLOUR,
+};
+
+struct mt9v022 {
+	struct i2c_client *client;
+	struct soc_camera_device icd;
+	enum mt9v022_sensor sensor;
+	struct i2c_client *data_switch;
+	u16 chip_control;
+	unsigned char datawidth;
+};
+
+static int reg_read(struct soc_camera_device *icd, const u8 reg)
+{
+	struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+	struct i2c_client *client = mt9v022->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 mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+	return i2c_smbus_write_word_data(mt9v022->client, reg, swab16(data));
+}
+
+static int reg_set(struct soc_camera_device *icd, const u8 reg,
+		   const u16 data)
+{
+	int ret;
+
+	if ((ret = reg_read(icd, reg)) < 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;
+
+	if ((ret = reg_read(icd, reg)) < 0)
+		return ret;
+	return reg_write(icd, reg, ret & ~data);
+}
+
+static int mt9v022_init(struct soc_camera_device *icd)
+{
+	struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+	int ret;
+
+	/* Almost the default mode: master, parallel, simultaneous, and an
+	 * undocumented bit 0x200, which is present in table 7, but not in 8,
+	 * plus snapshot mode to disable scan for now */
+//	mt9v022->chip_control |= 0x10;
+	ret = reg_write(icd, MT9V022_CHIP_CONTROL, mt9v022->chip_control);
+	if (ret >= 0)
+		reg_write(icd, MT9V022_READ_MODE, 0x300);
+
+	/* All defaults */
+	if (ret >= 0)
+		ret = reg_set(icd, MT9V022_AEC_AGC_ENABLE, 0x3); /* AEC, AGC on */
+	if (ret >= 0)
+		ret = reg_write(icd, MT9V022_MAX_TOTAL_SHUTTER_WIDTH, 480);
+	if (ret >= 0)
+		ret = reg_clear(icd, MT9V022_BLACK_LEVEL_CALIB_CTRL, 1); /* default - auto */
+	if (ret >= 0)
+		ret = reg_write(icd, MT9V022_DIGITAL_TEST_PATTERN, 0);
+
+	return ret < 0 ? ret :0;
+}
+
+static int mt9v022_release(struct soc_camera_device *icd)
+{
+	/* Nothing? */
+	return 0;
+}
+
+static int mt9v022_start_capture(struct soc_camera_device *icd)
+{
+	struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+	/* Switch to master "normal" mode */
+	mt9v022->chip_control &= ~0x10;
+	if (reg_write(icd, MT9V022_CHIP_CONTROL,
+		      mt9v022->chip_control) < 0)
+		return -EIO;
+	return 0;
+}
+
+static int mt9v022_stop_capture(struct soc_camera_device *icd)
+{
+	struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+	/* Switch to snapshot mode */
+//	mt9v022->chip_control |= 0x10;
+	if (reg_write(icd, MT9V022_CHIP_CONTROL,
+		      mt9v022->chip_control) < 0)
+		return -EIO;
+	return 0;
+}
+
+extern int pca9536_set_level(struct i2c_client *client, u8 pin, u8 level);
+
+static int external_bus_switch(struct i2c_client *extender, int go8bit)
+{
+	if (! extender)
+		return -ENODEV;
+
+#ifdef CONFIG_MT9V022_PCA9536_SWITCH
+	return pca9536_set_level(extender, 0, go8bit);
+#else
+	return -ENODEV;
+#endif
+}
+
+static int mt9v022_set_capture_format(struct soc_camera_device *icd, __u32 pixfmt,
+				      struct v4l2_rect *rect, unsigned int flags)
+{
+	struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+	unsigned int width_flag = flags & (IS_DATAWIDTH_10 | IS_DATAWIDTH_9 |
+					   IS_DATAWIDTH_8);
+	u16 pixclk = 0;
+	int ret;
+
+	/* Only one width bit may be set */
+	if (!is_power_of_2(width_flag))
+		return -EINVAL;
+
+	/* The caller provides a supported format, as verified per call to
+	 * icd->try_fmt_cap(), datawidth is from our supported format list */
+	switch (pixfmt) {
+	case V4L2_PIX_FMT_GREY:
+	case V4L2_PIX_FMT_Y16:
+		if (mt9v022->sensor != MT9V022_SENSOR_MONOCHROME)
+			return -EINVAL;
+		break;
+	case V4L2_PIX_FMT_SBGGR8:
+	case V4L2_PIX_FMT_SBGGR16:
+		if (mt9v022->sensor != MT9V022_SENSOR_COLOUR)
+			return -EINVAL;
+		break;
+	case 0:
+		/* No format change, only geometry */
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* Like in example app. Contradicts the datasheet though */
+	ret = reg_read(icd, MT9V022_AEC_AGC_ENABLE);
+	if (ret >= 0) {
+		if (ret & 1) /* Autoexposure */
+			ret = reg_write(icd, MT9V022_MAX_TOTAL_SHUTTER_WIDTH,
+					rect->height + icd->y_skip_top + 43);
+		else
+			ret = reg_write(icd, MT9V022_TOTAL_SHUTTER_WIDTH,
+					rect->height + icd->y_skip_top + 43);
+	}
+	/* Setup frame format: defaults apart from width and height */
+	if (ret >= 0)
+		ret = reg_write(icd, MT9V022_COLUMN_START, rect->left);
+	if (ret >= 0)
+		ret = reg_write(icd, MT9V022_ROW_START, rect->top);
+	if (ret >= 0)
+		/* Default 94, Phytec driver says: "width + horizontal blank >= 660" */
+		ret = reg_write(icd, MT9V022_HORIZONTAL_BLANKING,
+				rect->width > 660 - 43 ? 43 : 660 - rect->width);
+	if (ret >= 0)
+		ret = reg_write(icd, MT9V022_VERTICAL_BLANKING, 45);
+	if (ret >= 0)
+		ret = reg_write(icd, MT9V022_WINDOW_WIDTH, rect->width);
+	if (ret >= 0)
+		ret = reg_write(icd, MT9V022_WINDOW_HEIGHT, rect->height + icd->y_skip_top);
+
+	if (ret < 0)
+		return ret;
+
+	dev_dbg(&icd->dev, "Frame %ux%u pixel\n", rect->width, rect->height);
+
+	if ((mt9v022->datawidth != 10 && (width_flag == IS_DATAWIDTH_10)) ||
+	    (mt9v022->datawidth != 9  && (width_flag == IS_DATAWIDTH_9)) ||
+	    (mt9v022->datawidth != 8  && (width_flag == IS_DATAWIDTH_8))) {
+		/* data width switch requested */
+		if (! mt9v022->data_switch)
+			return -EINVAL;
+
+		/* Well, we actually only can do 10 or 8 bits... */
+		if (width_flag == IS_DATAWIDTH_9)
+			return -EINVAL;
+
+		ret = external_bus_switch(mt9v022->data_switch,
+					  width_flag == IS_DATAWIDTH_8);
+		if (ret < 0)
+			return ret;
+
+		mt9v022->datawidth = width_flag == IS_DATAWIDTH_8 ? 8 : 10;
+	}
+
+	if (flags & IS_PCLK_SAMPLE_RISING)
+		pixclk |= 0x10;
+
+	if (! (flags & IS_HSYNC_ACTIVE_HIGH))
+		pixclk |= 0x1;
+
+	if (! (flags & IS_VSYNC_ACTIVE_HIGH))
+		pixclk |= 0x2;
+
+	if ((ret = reg_write(icd, MT9V022_PIXCLK_FV_LV, pixclk)) < 0)
+		return ret;
+
+	if (! (flags & IS_MASTER))
+		mt9v022->chip_control &= ~0x8;
+
+	if ((ret = reg_write(icd, MT9V022_CHIP_CONTROL, mt9v022->chip_control)) < 0)
+		return ret;
+
+	dev_dbg(&icd->dev, "Calculated pixclk 0x%x, chip control 0x%x\n",
+		pixclk, mt9v022->chip_control);
+
+	return 0;
+}
+
+static int mt9v022_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 > 480 + icd->y_skip_top)
+		f->fmt.pix.height = 480 + icd->y_skip_top;
+	if (f->fmt.pix.width < 48)
+		f->fmt.pix.width = 48;
+	if (f->fmt.pix.width > 752)
+		f->fmt.pix.width = 752;
+	f->fmt.pix.width &= ~0x03; /* ? */
+
+	return 0;
+}
+
+static unsigned int mt9v022_get_datawidth(struct soc_camera_device *icd)
+{
+	struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+	return mt9v022->datawidth;
+}
+
+const struct v4l2_queryctrl mt9v022_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_HFLIP,
+		.type		= V4L2_CTRL_TYPE_BOOLEAN,
+		.name		= "Flip Horizontally",
+		.minimum	= 0,
+		.maximum	= 1,
+		.step		= 1,
+		.default_value	= 0,
+	}, {
+		.id		= V4L2_CID_GAIN,
+		.type		= V4L2_CTRL_TYPE_INTEGER,
+		.name		= "Analog Gain",
+		.minimum	= 64,
+		.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_AUTOGAIN,
+		.type		= V4L2_CTRL_TYPE_BOOLEAN,
+		.name		= "Automatic Gain",
+		.minimum	= 0,
+		.maximum	= 1,
+		.step		= 1,
+		.default_value	= 1,
+	}, {
+		.id		= V4L2_CID_AUTOEXPOSURE,
+		.type		= V4L2_CTRL_TYPE_BOOLEAN,
+		.name		= "Automatic Exposure",
+		.minimum	= 0,
+		.maximum	= 1,
+		.step		= 1,
+		.default_value	= 1,
+	}, {
+		.id		= V4L2_CID_PRIVATE_BASE,
+		.type		= V4L2_CTRL_TYPE_INTEGER,
+		.name		= "Register access",
+		.minimum	= reg_to_int(REG_READ, 0, 0),
+		.maximum	= reg_to_int(REG_WRITE, 0xff, (1 << 16) - 1),
+		.step		= 1,
+		.default_value	= 1,
+	}
+};
+
+static int mt9v022_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl);
+static int mt9v022_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl);
+
+static struct soc_camera_ops mt9v022_ops = {
+	.owner			= THIS_MODULE,
+	.init			= mt9v022_init,
+	.release		= mt9v022_release,
+	.start_capture		= mt9v022_start_capture,
+	.stop_capture		= mt9v022_stop_capture,
+	.set_capture_format	= mt9v022_set_capture_format,
+	.try_fmt_cap		= mt9v022_try_fmt_cap,
+	.formats		= mt9v022_formats,
+	.num_formats		= ARRAY_SIZE(mt9v022_formats),
+	.get_datawidth		= mt9v022_get_datawidth,
+	.controls		= mt9v022_controls,
+	.num_controls		= ARRAY_SIZE(mt9v022_controls),
+	.get_control		= mt9v022_get_control,
+	.set_control		= mt9v022_set_control,
+};
+
+static int mt9v022_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
+{
+	int data;
+
+	switch (ctrl->id) {
+	case V4L2_CID_VFLIP:
+		data = reg_read(icd, MT9V022_READ_MODE);
+		if (data < 0)
+			return -EIO;
+		ctrl->value = !!(data & 0x10);
+		break;
+	case V4L2_CID_HFLIP:
+		data = reg_read(icd, MT9V022_READ_MODE);
+		if (data < 0)
+			return -EIO;
+		ctrl->value = !!(data & 0x20);
+		break;
+	case V4L2_CID_AUTOEXPOSURE:
+		data = reg_read(icd, MT9V022_AEC_AGC_ENABLE);
+		if (data < 0)
+			return -EIO;
+		ctrl->value = !!(data & 0x1);
+		break;
+	case V4L2_CID_AUTOGAIN:
+		data = reg_read(icd, MT9V022_AEC_AGC_ENABLE);
+		if (data < 0)
+			return -EIO;
+		ctrl->value = !!(data & 0x2);
+		break;
+	case V4L2_CID_PRIVATE_BASE:
+		if (1) {
+			union reg_access_32 u;
+
+			u.ctrl = ctrl->value;
+			if (u.reg.rw != REG_READ)
+				return -EINVAL;
+			data = reg_read(icd, u.reg.address);
+			if (data < 0)
+				return -EIO;
+			u.reg.value = data;
+			ctrl->value = u.ctrl;
+		}
+	}
+	return 0;
+}
+
+static int mt9v022_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
+{
+	int data;
+	const struct v4l2_queryctrl *qctrl;
+
+	qctrl = soc_camera_find_qctrl(&mt9v022_ops, ctrl->id);
+
+	if (!qctrl)
+		return -EINVAL;
+
+	switch (ctrl->id) {
+	case V4L2_CID_VFLIP:
+		if (ctrl->value)
+			data = reg_set(icd, MT9V022_READ_MODE, 0x10);
+		else
+			data = reg_clear(icd, MT9V022_READ_MODE, 0x10);
+		if (data < 0)
+			return -EIO;
+		break;
+	case V4L2_CID_HFLIP:
+		if (ctrl->value)
+			data = reg_set(icd, MT9V022_READ_MODE, 0x20);
+		else
+			data = reg_clear(icd, MT9V022_READ_MODE, 0x20);
+		if (data < 0)
+			return -EIO;
+		break;
+	case V4L2_CID_GAIN:
+		/* mt9v022 has minimum == default */
+		if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
+			return -EINVAL;
+		else {
+			unsigned long range = qctrl->maximum - qctrl->minimum;
+			/* Datasheet says 16 to 64. autogain only works properly
+			 * after setting gain to maximum 14. Larger values
+			 * produce "white fly" noise effect. On the whole,
+			 * manually setting analog gain does no good. */
+			unsigned long gain = ((ctrl->value - qctrl->minimum) * 10 +
+					      range / 2) / range + 4;
+			if (gain >= 32)
+				gain &= ~1;
+			/* The user wants to set gain manually, hope, she
+			 * knows, what she's doing... Switch AGC off. */
+
+			if (reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x2) < 0)
+				return -EIO;
+
+			dev_info(&icd->dev, "Setting gain from %d to %lu\n",
+				 reg_read(icd, MT9V022_ANALOG_GAIN), gain);
+			if (reg_write(icd, MT9V022_ANALOG_GAIN, gain) < 0)
+				return -EIO;
+			icd->gain = ctrl->value;
+		}
+		break;
+	case V4L2_CID_EXPOSURE:
+		/* mt9v022 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) * 479 +
+						 range / 2) / range + 1;
+			/* The user wants to set shutter width manually, hope, she
+			 * knows, what she's doing... Switch AEC off. */
+
+			if (reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x1) < 0)
+				return -EIO;
+
+			dev_info(&icd->dev, "Setting shutter width from %d to %lu\n",
+				 reg_read(icd, MT9V022_TOTAL_SHUTTER_WIDTH), shutter);
+			if (reg_write(icd, MT9V022_TOTAL_SHUTTER_WIDTH, shutter) < 0)
+				return -EIO;
+			icd->exposure = ctrl->value;
+		}
+		break;
+	case V4L2_CID_AUTOGAIN:
+		if (ctrl->value)
+			data = reg_set(icd, MT9V022_AEC_AGC_ENABLE, 0x2);
+		else
+			data = reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x2);
+		if (data < 0)
+			return -EIO;
+		break;
+	case V4L2_CID_AUTOEXPOSURE:
+		if (ctrl->value)
+			data = reg_set(icd, MT9V022_AEC_AGC_ENABLE, 0x1);
+		else
+			data = reg_clear(icd, MT9V022_AEC_AGC_ENABLE, 0x1);
+		if (data < 0)
+			return -EIO;
+		break;
+	case V4L2_CID_PRIVATE_BASE:
+		if (1) {
+			union reg_access_32 u;
+
+			u.ctrl = ctrl->value;
+			if (u.reg.rw != REG_WRITE)
+				return -EINVAL;
+			data = reg_write(icd, u.reg.address, u.reg.value);
+			if (data < 0)
+				return -EIO;
+		}
+	}
+	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 mt9v022_video_probe(struct soc_camera_device *icd)
+{
+	struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+	s32 data;
+	int ret;
+
+	if (!icd->dev.parent ||
+	    to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
+		return -ENODEV;
+
+	/* Read out the chip version register */
+	data = reg_read(icd, MT9V022_CHIP_VERSION);
+
+	/* must be 0x1311 or 0x1313 */
+	if (data != 0x1311 && data != 0x1313) {
+		ret = -ENODEV;
+		dev_info(&icd->dev, "No MT9V022 detected, ID register 0x%x\n",
+			 data);
+		goto ei2c;
+	}
+
+	/* Soft reset */
+	ret = reg_write(icd, MT9V022_RESET, 1);
+	if (ret < 0)
+		goto ei2c;
+	/* 15 clock cycles */
+	udelay(200);
+	if (reg_read(icd, MT9V022_RESET)) {
+		dev_err(&icd->dev, "Resetting MT9V022 failed!\n");
+		goto ei2c;
+	}
+
+	/* Set monochrome or colour sensor type */
+	if (sensor_type && (!strcmp("colour", sensor_type) ||
+			    !strcmp("color", sensor_type))) {
+		ret = reg_write(icd, MT9V022_PIXEL_OPERATION_MODE, 4 | 0x11);
+		mt9v022->sensor = MT9V022_SENSOR_COLOUR;
+	} else {
+		ret = reg_write(icd, MT9V022_PIXEL_OPERATION_MODE, 0x11);
+		mt9v022->sensor = MT9V022_SENSOR_MONOCHROME;
+	}
+
+	if (ret >= 0)
+		ret = soc_camera_video_start(icd);
+	if (ret < 0)
+		goto eisis;
+
+	dev_info(&icd->dev, "Detected a MT9V022 chip ID %x, %s sensor\n",
+		 data, mt9v022->sensor == MT9V022_SENSOR_MONOCHROME ?
+		 "monochrome" : "colour");
+
+	return 0;
+
+eisis:
+ei2c:
+	return ret;
+}
+
+static void mt9v022_video_remove(struct soc_camera_device *icd)
+{
+	struct mt9v022 *mt9v022 = container_of(icd, struct mt9v022, icd);
+
+	dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9v022->client->addr,
+		mt9v022->icd.dev.parent, mt9v022->icd.vdev);
+	soc_camera_video_stop(&mt9v022->icd);
+}
+
+static int mt9v022_probe(struct i2c_client *client)
+{
+	struct mt9v022		*mt9v022;
+	struct i2c_adapter	*adapter = to_i2c_adapter(client->dev.parent);
+	int ret;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
+		pr_debug("%s: I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n", __FUNCTION__);
+		return -EIO;
+	}
+
+	if (!(mt9v022 = kzalloc(sizeof(struct mt9v022), GFP_KERNEL)))
+		return -ENOMEM;
+
+	mt9v022->chip_control = MT9V022_CHIP_CONTROL_DEFAULT;
+	mt9v022->client = client;
+	i2c_set_clientdata(client, mt9v022);
+
+	mt9v022->icd.probe	= mt9v022_video_probe;
+	mt9v022->icd.remove	= mt9v022_video_remove;
+	mt9v022->icd.ops	= &mt9v022_ops;
+	mt9v022->icd.control	= &client->dev;
+	mt9v022->icd.x_min	= 1;
+	mt9v022->icd.y_min	= 4;
+	mt9v022->icd.x_current	= 1;
+	mt9v022->icd.y_current	= 4;
+	mt9v022->icd.width_min	= 48;
+	mt9v022->icd.width_max	= 752;
+	mt9v022->icd.height_min	= 32;
+	mt9v022->icd.height_max	= 480;
+	mt9v022->icd.y_skip_top	= 1;
+	/* 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. */
+	mt9v022->datawidth = 10;
+
+	if (client->dev.platform_data) {
+		struct soc_camera_link *icl = client->dev.platform_data;
+		/* We have a data bus switch. We call pca9536 functions
+		 * explicitly by name so the driver will not be unloaded,
+		 * and we'll check mt9v022->data_switch anyway every time
+		 * before calling. The only concern is that the driver
+		 * doesn't detach itself from the device, but so far it is
+		 * not supported by the I2C layer */
+		if (icl->extender)
+			mt9v022->data_switch	= *icl->extender;
+		mt9v022->icd.iface	= icl->bus_id;
+	}
+
+	ret = soc_camera_device_register(&mt9v022->icd);
+	if (ret)
+		goto eisdr;
+
+	return 0;
+
+eisdr:
+	kfree(mt9v022);
+	return ret;
+}
+
+static int mt9v022_remove(struct i2c_client *client)
+{
+	struct mt9v022 *mt9v022 = i2c_get_clientdata(client);
+
+	soc_camera_device_unregister(&mt9v022->icd);
+	kfree(mt9v022);
+
+	return 0;
+}
+
+static struct i2c_driver mt9v022_i2c_driver = {
+	.driver = {
+		.name = "mt9v022",
+	},
+	.probe		= mt9v022_probe,
+	.remove		= mt9v022_remove,
+};
+
+static int __init mt9v022_mod_init(void)
+{
+	return i2c_add_driver(&mt9v022_i2c_driver);
+}
+
+static void __exit mt9v022_mod_exit(void)
+{
+	i2c_del_driver(&mt9v022_i2c_driver);
+}
+
+module_init(mt9v022_mod_init);
+module_exit(mt9v022_mod_exit);
+
+MODULE_DESCRIPTION("Micron MT9V022 Camera driver");
+MODULE_AUTHOR("Guennadi Liakhovetski <[email-masked]>");
+MODULE_LICENSE("GPL");
-- 
1.5.3.4

--
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