V4L/DVB (10099): soc-camera: add support for MT9T031 CMOS camera sensor from Micron (4e96fd08) · Commits · 戴 / test

drivers/media/video/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -741,6 +741,12 @@ config SOC_CAMERA_MT9M111
		help
		This driver supports MT9M111 and MT9M112 cameras from Micron

		config SOC_CAMERA_MT9T031
		tristate "mt9t031 support"
		depends on SOC_CAMERA && I2C
		help
		This driver supports MT9T031 cameras from Micron.

		config SOC_CAMERA_MT9V022
		tristate "mt9v022 support"
		depends on SOC_CAMERA && I2C

drivers/media/video/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -137,6 +137,7 @@ obj-$(CONFIG_VIDEO_OMAP2) += omap2cam.o
		obj-$(CONFIG_SOC_CAMERA) += soc_camera.o
		obj-$(CONFIG_SOC_CAMERA_MT9M001) += mt9m001.o
		obj-$(CONFIG_SOC_CAMERA_MT9M111) += mt9m111.o
		obj-$(CONFIG_SOC_CAMERA_MT9T031) += mt9t031.o
		obj-$(CONFIG_SOC_CAMERA_MT9V022) += mt9v022.o
		obj-$(CONFIG_SOC_CAMERA_OV772X) += ov772x.o
		obj-$(CONFIG_SOC_CAMERA_PLATFORM) += soc_camera_platform.o

drivers/media/video/mt9t031.c

0 → 100644

+736 −0

Original line number	Diff line number	Diff line
		/*
		* Driver for MT9T031 CMOS Image Sensor from Micron
		*
		* Copyright (C) 2008, Guennadi Liakhovetski, DENX Software Engineering <lg@denx.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>

		/* mt9t031 i2c address 0x5d
		* The platform has to define i2c_board_info
		* and call i2c_register_board_info() */

		/* mt9t031 selected register addresses */
		#define MT9T031_CHIP_VERSION 0x00
		#define MT9T031_ROW_START 0x01
		#define MT9T031_COLUMN_START 0x02
		#define MT9T031_WINDOW_HEIGHT 0x03
		#define MT9T031_WINDOW_WIDTH 0x04
		#define MT9T031_HORIZONTAL_BLANKING 0x05
		#define MT9T031_VERTICAL_BLANKING 0x06
		#define MT9T031_OUTPUT_CONTROL 0x07
		#define MT9T031_SHUTTER_WIDTH_UPPER 0x08
		#define MT9T031_SHUTTER_WIDTH 0x09
		#define MT9T031_PIXEL_CLOCK_CONTROL 0x0a
		#define MT9T031_FRAME_RESTART 0x0b
		#define MT9T031_SHUTTER_DELAY 0x0c
		#define MT9T031_RESET 0x0d
		#define MT9T031_READ_MODE_1 0x1e
		#define MT9T031_READ_MODE_2 0x20
		#define MT9T031_READ_MODE_3 0x21
		#define MT9T031_ROW_ADDRESS_MODE 0x22
		#define MT9T031_COLUMN_ADDRESS_MODE 0x23
		#define MT9T031_GLOBAL_GAIN 0x35
		#define MT9T031_CHIP_ENABLE 0xF8

		#define MT9T031_MAX_HEIGHT 1536
		#define MT9T031_MAX_WIDTH 2048
		#define MT9T031_MIN_HEIGHT 2
		#define MT9T031_MIN_WIDTH 2
		#define MT9T031_HORIZONTAL_BLANK 142
		#define MT9T031_VERTICAL_BLANK 25
		#define MT9T031_COLUMN_SKIP 32
		#define MT9T031_ROW_SKIP 20

		#define MT9T031_BUS_PARAM (SOCAM_PCLK_SAMPLE_RISING \| \
		SOCAM_PCLK_SAMPLE_FALLING \| SOCAM_HSYNC_ACTIVE_HIGH \| \
		SOCAM_VSYNC_ACTIVE_HIGH \| SOCAM_DATA_ACTIVE_HIGH \| \
		SOCAM_MASTER \| SOCAM_DATAWIDTH_10)

		static const struct soc_camera_data_format mt9t031_colour_formats[] = {
		{
		.name = "Bayer (sRGB) 10 bit",
		.depth = 10,
		.fourcc = V4L2_PIX_FMT_SGRBG10,
		.colorspace = V4L2_COLORSPACE_SRGB,
		}
		};

		struct mt9t031 {
		struct i2c_client *client;
		struct soc_camera_device icd;
		int model; /* V4L2_IDENT_MT9T031* codes from v4l2-chip-ident.h */
		unsigned char autoexposure;
		u16 xskip;
		u16 yskip;
		};

		static int reg_read(struct soc_camera_device *icd, const u8 reg)
		{
		struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
		struct i2c_client *client = mt9t031->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 mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
		return i2c_smbus_write_word_data(mt9t031->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 set_shutter(struct soc_camera_device *icd, const u32 data)
		{
		int ret;

		ret = reg_write(icd, MT9T031_SHUTTER_WIDTH_UPPER, data >> 16);

		if (ret >= 0)
		ret = reg_write(icd, MT9T031_SHUTTER_WIDTH, data & 0xffff);

		return ret;
		}

		static int get_shutter(struct soc_camera_device icd, u32 data)
		{
		int ret;

		ret = reg_read(icd, MT9T031_SHUTTER_WIDTH_UPPER);
		*data = ret << 16;

		if (ret >= 0)
		ret = reg_read(icd, MT9T031_SHUTTER_WIDTH);
		*data \|= ret & 0xffff;

		return ret < 0 ? ret : 0;
		}

		static int mt9t031_init(struct soc_camera_device *icd)
		{
		int ret;

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

		ret = reg_write(icd, MT9T031_RESET, 1);
		if (ret >= 0)
		ret = reg_write(icd, MT9T031_RESET, 0);
		if (ret >= 0)
		ret = reg_clear(icd, MT9T031_OUTPUT_CONTROL, 3);

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

		static int mt9t031_release(struct soc_camera_device *icd)
		{
		/* Disable the chip */
		reg_clear(icd, MT9T031_OUTPUT_CONTROL, 3);
		return 0;
		}

		static int mt9t031_start_capture(struct soc_camera_device *icd)
		{
		/* Switch to master "normal" mode */
		if (reg_set(icd, MT9T031_OUTPUT_CONTROL, 3) < 0)
		return -EIO;
		return 0;
		}

		static int mt9t031_stop_capture(struct soc_camera_device *icd)
		{
		/* Stop sensor readout */
		if (reg_clear(icd, MT9T031_OUTPUT_CONTROL, 3) < 0)
		return -EIO;
		return 0;
		}

		static int mt9t031_set_bus_param(struct soc_camera_device *icd,
		unsigned long flags)
		{
		/* The caller should have queried our parameters, check anyway */
		if (flags & ~MT9T031_BUS_PARAM)
		return -EINVAL;

		if (flags & SOCAM_PCLK_SAMPLE_FALLING)
		reg_set(icd, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);
		else
		reg_clear(icd, MT9T031_PIXEL_CLOCK_CONTROL, 0x8000);

		return 0;
		}

		static unsigned long mt9t031_query_bus_param(struct soc_camera_device *icd)
		{
		struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
		struct soc_camera_link *icl = mt9t031->client->dev.platform_data;

		return soc_camera_apply_sensor_flags(icl, MT9T031_BUS_PARAM);
		}

		static int mt9t031_set_fmt(struct soc_camera_device *icd,
		__u32 pixfmt, struct v4l2_rect *rect)
		{
		struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
		int ret;
		const u16 hblank = MT9T031_HORIZONTAL_BLANK,
		vblank = MT9T031_VERTICAL_BLANK;
		u16 xbin, xskip = mt9t031->xskip, ybin, yskip = mt9t031->yskip,
		width = rect->width * xskip, height = rect->height * yskip;

		if (pixfmt) {
		/* S_FMT - use binning and skipping for scaling, recalculate */
		/* Is this more optimal than just a division? */
		for (xskip = 8; xskip > 1; xskip--)
		if (rect->width * xskip <= icd->width_max)
		break;

		for (yskip = 8; yskip > 1; yskip--)
		if (rect->height * yskip <= icd->height_max)
		break;

		width = rect->width * xskip;
		height = rect->height * yskip;

		dev_dbg(&icd->dev, "xskip %u, width %u, yskip %u, height %u\n",
		xskip, width, yskip, height);
		}

		xbin = min(xskip, (u16)3);
		ybin = min(yskip, (u16)3);

		/* Make sure we don't exceed frame limits */
		if (rect->left + width > icd->width_max)
		rect->left = (icd->width_max - width) / 2;

		if (rect->top + height > icd->height_max)
		rect->top = (icd->height_max - height) / 2;

		/* Could just do roundup(rect->left, [xy]bin); but this is cheaper */
		switch (xbin) {
		case 2:
		rect->left = (rect->left + 1) & ~1;
		break;
		case 3:
		rect->left = roundup(rect->left, 3);
		}

		switch (ybin) {
		case 2:
		rect->top = (rect->top + 1) & ~1;
		break;
		case 3:
		rect->top = roundup(rect->top, 3);
		}

		/* Blanking and start values - default... */
		ret = reg_write(icd, MT9T031_HORIZONTAL_BLANKING, hblank);
		if (ret >= 0)
		ret = reg_write(icd, MT9T031_VERTICAL_BLANKING, vblank);

		if (pixfmt) {
		/* Binning, skipping */
		if (ret >= 0)
		ret = reg_write(icd, MT9T031_COLUMN_ADDRESS_MODE,
		((xbin - 1) << 4) \| (xskip - 1));
		if (ret >= 0)
		ret = reg_write(icd, MT9T031_ROW_ADDRESS_MODE,
		((ybin - 1) << 4) \| (yskip - 1));
		}
		dev_dbg(&icd->dev, "new left %u, top %u\n", rect->left, rect->top);

		/* The caller provides a supported format, as guaranteed by
		* icd->try_fmt_cap(), soc_camera_s_crop() and soc_camera_cropcap() */
		if (ret >= 0)
		ret = reg_write(icd, MT9T031_COLUMN_START, rect->left);
		if (ret >= 0)
		ret = reg_write(icd, MT9T031_ROW_START, rect->top);
		if (ret >= 0)
		ret = reg_write(icd, MT9T031_WINDOW_WIDTH, width - 1);
		if (ret >= 0)
		ret = reg_write(icd, MT9T031_WINDOW_HEIGHT,
		height + icd->y_skip_top - 1);
		if (ret >= 0 && mt9t031->autoexposure) {
		ret = set_shutter(icd, height + icd->y_skip_top + vblank);
		if (ret >= 0) {
		const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
		const struct v4l2_queryctrl *qctrl =
		soc_camera_find_qctrl(icd->ops,
		V4L2_CID_EXPOSURE);
		icd->exposure = (shutter_max / 2 + (height +
		icd->y_skip_top + vblank - 1) *
		(qctrl->maximum - qctrl->minimum)) /
		shutter_max + qctrl->minimum;
		}
		}

		if (!ret && pixfmt) {
		mt9t031->xskip = xskip;
		mt9t031->yskip = yskip;
		}

		return ret < 0 ? ret : 0;
		}

		static int mt9t031_try_fmt(struct soc_camera_device *icd,
		struct v4l2_format *f)
		{
		struct v4l2_pix_format *pix = &f->fmt.pix;

		if (pix->height < icd->height_min)
		pix->height = icd->height_min;
		if (pix->height > icd->height_max)
		pix->height = icd->height_max;
		if (pix->width < icd->width_min)
		pix->width = icd->width_min;
		if (pix->width > icd->width_max)
		pix->width = icd->width_max;

		pix->width &= ~0x01; /* has to be even */
		pix->height &= ~0x01; /* has to be even */

		return 0;
		}

		static int mt9t031_get_chip_id(struct soc_camera_device *icd,
		struct v4l2_chip_ident *id)
		{
		struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);

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

		if (id->match_chip != mt9t031->client->addr)
		return -ENODEV;

		id->ident = mt9t031->model;
		id->revision = 0;

		return 0;
		}

		#ifdef CONFIG_VIDEO_ADV_DEBUG
		static int mt9t031_get_register(struct soc_camera_device *icd,
		struct v4l2_register *reg)
		{
		struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);

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

		if (reg->match_chip != mt9t031->client->addr)
		return -ENODEV;

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

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

		return 0;
		}

		static int mt9t031_set_register(struct soc_camera_device *icd,
		struct v4l2_register *reg)
		{
		struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);

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

		if (reg->match_chip != mt9t031->client->addr)
		return -ENODEV;

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

		return 0;
		}
		#endif

		static const struct v4l2_queryctrl mt9t031_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 mt9t031_video_probe(struct soc_camera_device *);
		static void mt9t031_video_remove(struct soc_camera_device *);
		static int mt9t031_get_control(struct soc_camera_device , struct v4l2_control );
		static int mt9t031_set_control(struct soc_camera_device , struct v4l2_control );

		static struct soc_camera_ops mt9t031_ops = {
		.owner = THIS_MODULE,
		.probe = mt9t031_video_probe,
		.remove = mt9t031_video_remove,
		.init = mt9t031_init,
		.release = mt9t031_release,
		.start_capture = mt9t031_start_capture,
		.stop_capture = mt9t031_stop_capture,
		.set_fmt = mt9t031_set_fmt,
		.try_fmt = mt9t031_try_fmt,
		.set_bus_param = mt9t031_set_bus_param,
		.query_bus_param = mt9t031_query_bus_param,
		.controls = mt9t031_controls,
		.num_controls = ARRAY_SIZE(mt9t031_controls),
		.get_control = mt9t031_get_control,
		.set_control = mt9t031_set_control,
		.get_chip_id = mt9t031_get_chip_id,
		#ifdef CONFIG_VIDEO_ADV_DEBUG
		.get_register = mt9t031_get_register,
		.set_register = mt9t031_set_register,
		#endif
		};

		static int mt9t031_get_control(struct soc_camera_device icd, struct v4l2_control ctrl)
		{
		struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
		int data;

		switch (ctrl->id) {
		case V4L2_CID_VFLIP:
		data = reg_read(icd, MT9T031_READ_MODE_2);
		if (data < 0)
		return -EIO;
		ctrl->value = !!(data & 0x8000);
		break;
		case V4L2_CID_HFLIP:
		data = reg_read(icd, MT9T031_READ_MODE_2);
		if (data < 0)
		return -EIO;
		ctrl->value = !!(data & 0x4000);
		break;
		case V4L2_CID_EXPOSURE_AUTO:
		ctrl->value = mt9t031->autoexposure;
		break;
		}
		return 0;
		}

		static int mt9t031_set_control(struct soc_camera_device icd, struct v4l2_control ctrl)
		{
		struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);
		const struct v4l2_queryctrl *qctrl;
		int data;

		qctrl = soc_camera_find_qctrl(&mt9t031_ops, ctrl->id);

		if (!qctrl)
		return -EINVAL;

		switch (ctrl->id) {
		case V4L2_CID_VFLIP:
		if (ctrl->value)
		data = reg_set(icd, MT9T031_READ_MODE_2, 0x8000);
		else
		data = reg_clear(icd, MT9T031_READ_MODE_2, 0x8000);
		if (data < 0)
		return -EIO;
		break;
		case V4L2_CID_HFLIP:
		if (ctrl->value)
		data = reg_set(icd, MT9T031_READ_MODE_2, 0x4000);
		else
		data = reg_clear(icd, MT9T031_READ_MODE_2, 0x4000);
		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, MT9T031_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, MT9T031_GLOBAL_GAIN), data);
		data = reg_write(icd, MT9T031_GLOBAL_GAIN, data);
		if (data < 0)
		return -EIO;
		}

		/* Success */
		icd->gain = ctrl->value;
		break;
		case V4L2_CID_EXPOSURE:
		/* mt9t031 has maximum == default */
		if (ctrl->value > qctrl->maximum \|\| ctrl->value < qctrl->minimum)
		return -EINVAL;
		else {
		const unsigned long range = qctrl->maximum - qctrl->minimum;
		const u32 shutter = ((ctrl->value - qctrl->minimum) * 1048 +
		range / 2) / range + 1;
		u32 old;

		get_shutter(icd, &old);
		dev_dbg(&icd->dev, "Setting shutter width from %u to %u\n",
		old, shutter);
		if (set_shutter(icd, shutter) < 0)
		return -EIO;
		icd->exposure = ctrl->value;
		mt9t031->autoexposure = 0;
		}
		break;
		case V4L2_CID_EXPOSURE_AUTO:
		if (ctrl->value) {
		const u16 vblank = MT9T031_VERTICAL_BLANK;
		const u32 shutter_max = MT9T031_MAX_HEIGHT + vblank;
		if (set_shutter(icd, icd->height +
		icd->y_skip_top + vblank) < 0)
		return -EIO;
		qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
		icd->exposure = (shutter_max / 2 + (icd->height +
		icd->y_skip_top + vblank - 1) *
		(qctrl->maximum - qctrl->minimum)) /
		shutter_max + qctrl->minimum;
		mt9t031->autoexposure = 1;
		} else
		mt9t031->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 mt9t031_video_probe(struct soc_camera_device *icd)
		{
		struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, 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(icd, MT9T031_CHIP_ENABLE, 1);
		dev_dbg(&icd->dev, "write: %d\n", data);

		/* Read out the chip version register */
		data = reg_read(icd, MT9T031_CHIP_VERSION);

		switch (data) {
		case 0x1621:
		mt9t031->model = V4L2_IDENT_MT9T031;
		icd->formats = mt9t031_colour_formats;
		icd->num_formats = ARRAY_SIZE(mt9t031_colour_formats);
		break;
		default:
		ret = -ENODEV;
		dev_err(&icd->dev,
		"No MT9T031 chip detected, register read %x\n", data);
		goto ei2c;
		}

		dev_info(&icd->dev, "Detected a MT9T031 chip ID %x\n", data);

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

		return 0;

		evstart:
		ei2c:
		return ret;
		}

		static void mt9t031_video_remove(struct soc_camera_device *icd)
		{
		struct mt9t031 *mt9t031 = container_of(icd, struct mt9t031, icd);

		dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9t031->client->addr,
		icd->dev.parent, icd->vdev);
		soc_camera_video_stop(icd);
		}

		static int mt9t031_probe(struct i2c_client *client,
		const struct i2c_device_id *did)
		{
		struct mt9t031 *mt9t031;
		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, "MT9T031 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;
		}

		mt9t031 = kzalloc(sizeof(struct mt9t031), GFP_KERNEL);
		if (!mt9t031)
		return -ENOMEM;

		mt9t031->client = client;
		i2c_set_clientdata(client, mt9t031);

		/* Second stage probe - when a capture adapter is there */
		icd = &mt9t031->icd;
		icd->ops = &mt9t031_ops;
		icd->control = &client->dev;
		icd->x_min = MT9T031_COLUMN_SKIP;
		icd->y_min = MT9T031_ROW_SKIP;
		icd->x_current = icd->x_min;
		icd->y_current = icd->y_min;
		icd->width_min = MT9T031_MIN_WIDTH;
		icd->width_max = MT9T031_MAX_WIDTH;
		icd->height_min = MT9T031_MIN_HEIGHT;
		icd->height_max = MT9T031_MAX_HEIGHT;
		icd->y_skip_top = 0;
		icd->iface = icl->bus_id;
		/* Simulated autoexposure. If enabled, we calculate shutter width
		* ourselves in the driver based on vertical blanking and frame width */
		mt9t031->autoexposure = 1;

		mt9t031->xskip = 1;
		mt9t031->yskip = 1;

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

		return 0;

		eisdr:
		i2c_set_clientdata(client, NULL);
		kfree(mt9t031);
		return ret;
		}

		static int mt9t031_remove(struct i2c_client *client)
		{
		struct mt9t031 *mt9t031 = i2c_get_clientdata(client);

		soc_camera_device_unregister(&mt9t031->icd);
		i2c_set_clientdata(client, NULL);
		kfree(mt9t031);

		return 0;
		}

		static const struct i2c_device_id mt9t031_id[] = {
		{ "mt9t031", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, mt9t031_id);

		static struct i2c_driver mt9t031_i2c_driver = {
		.driver = {
		.name = "mt9t031",
		},
		.probe = mt9t031_probe,
		.remove = mt9t031_remove,
		.id_table = mt9t031_id,
		};

		static int __init mt9t031_mod_init(void)
		{
		return i2c_add_driver(&mt9t031_i2c_driver);
		}

		static void __exit mt9t031_mod_exit(void)
		{
		i2c_del_driver(&mt9t031_i2c_driver);
		}

		module_init(mt9t031_mod_init);
		module_exit(mt9t031_mod_exit);

		MODULE_DESCRIPTION("Micron MT9T031 Camera driver");
		MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
		MODULE_LICENSE("GPL v2");

include/media/v4l2-chip-ident.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -177,6 +177,7 @@ enum {
		V4L2_IDENT_MT9M112 = 45008,
		V4L2_IDENT_MT9V022IX7ATC = 45010, /* No way to detect "normal" I77ATx */
		V4L2_IDENT_MT9V022IX7ATM = 45015, /* and "lead free" IA7ATx chips */
		V4L2_IDENT_MT9T031 = 45020,
		};

		#endif

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