openslx/kernel-qcow2-linux.git - In-kernel qcow2 (Kernel part)

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// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for MT9M001 CMOS Image Sensor from Micron
 *
 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/log2.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/videodev2.h>

#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-event.h>
#include <media/v4l2-subdev.h>

/*
 * mt9m001 i2c address 0x5d
 */

/* 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

#define MT9M001_MAX_WIDTH		1280
#define MT9M001_MAX_HEIGHT		1024
#define MT9M001_MIN_WIDTH		48
#define MT9M001_MIN_HEIGHT		32
#define MT9M001_COLUMN_SKIP		20
#define MT9M001_ROW_SKIP		12
#define MT9M001_DEFAULT_HBLANK		9
#define MT9M001_DEFAULT_VBLANK		25

/* MT9M001 has only one fixed colorspace per pixelcode */
struct mt9m001_datafmt {
	u32	code;
	enum v4l2_colorspace		colorspace;
};

/* Find a data format by a pixel code in an array */
static const struct mt9m001_datafmt *mt9m001_find_datafmt(
	u32 code, const struct mt9m001_datafmt *fmt,
	int n)
{
	int i;
	for (i = 0; i < n; i++)
		if (fmt[i].code == code)
			return fmt + i;

	return NULL;
}

static const struct mt9m001_datafmt mt9m001_colour_fmts[] = {
	/*
	 * Order important: first natively supported,
	 * second supported with a GPIO extender
	 */
	{MEDIA_BUS_FMT_SBGGR10_1X10, V4L2_COLORSPACE_SRGB},
	{MEDIA_BUS_FMT_SBGGR8_1X8, V4L2_COLORSPACE_SRGB},
};

static const struct mt9m001_datafmt mt9m001_monochrome_fmts[] = {
	/* Order important - see above */
	{MEDIA_BUS_FMT_Y10_1X10, V4L2_COLORSPACE_JPEG},
	{MEDIA_BUS_FMT_Y8_1X8, V4L2_COLORSPACE_JPEG},
};

struct mt9m001 {
	struct v4l2_subdev subdev;
	struct v4l2_ctrl_handler hdl;
	struct {
		/* exposure/auto-exposure cluster */
		struct v4l2_ctrl *autoexposure;
		struct v4l2_ctrl *exposure;
	};
	bool streaming;
	struct mutex mutex;
	struct v4l2_rect rect;	/* Sensor window */
	struct clk *clk;
	struct gpio_desc *standby_gpio;
	struct gpio_desc *reset_gpio;
	const struct mt9m001_datafmt *fmt;
	const struct mt9m001_datafmt *fmts;
	int num_fmts;
	unsigned int total_h;
	unsigned short y_skip_top;	/* Lines to skip at the top */
	struct media_pad pad;
};

static struct mt9m001 *to_mt9m001(const struct i2c_client *client)
{
	return container_of(i2c_get_clientdata(client), struct mt9m001, subdev);
}

static int reg_read(struct i2c_client *client, const u8 reg)
{
	return i2c_smbus_read_word_swapped(client, reg);
}

static int reg_write(struct i2c_client *client, const u8 reg,
		     const u16 data)
{
	return i2c_smbus_write_word_swapped(client, reg, data);
}

static int reg_set(struct i2c_client *client, const u8 reg,
		   const u16 data)
{
	int ret;

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

static int reg_clear(struct i2c_client *client, const u8 reg,
		     const u16 data)
{
	int ret;

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

struct mt9m001_reg {
	u8 reg;
	u16 data;
};

static int multi_reg_write(struct i2c_client *client,
			   const struct mt9m001_reg *regs, int num)
{
	int i;

	for (i = 0; i < num; i++) {
		int ret = reg_write(client, regs[i].reg, regs[i].data);

		if (ret)
			return ret;
	}

	return 0;
}

static int mt9m001_init(struct i2c_client *client)
{
	const struct mt9m001_reg init_regs[] = {
		/*
		 * Issue a soft reset. This returns all registers to their
		 * default values.
		 */
		{ MT9M001_RESET, 1 },
		{ MT9M001_RESET, 0 },
		/* Disable chip, synchronous option update */
		{ MT9M001_OUTPUT_CONTROL, 0 }
	};

	dev_dbg(&client->dev, "%s\n", __func__);

	return multi_reg_write(client, init_regs, ARRAY_SIZE(init_regs));
}

static int mt9m001_apply_selection(struct v4l2_subdev *sd)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9m001 *mt9m001 = to_mt9m001(client);
	const struct mt9m001_reg regs[] = {
		/* Blanking and start values - default... */
		{ MT9M001_HORIZONTAL_BLANKING, MT9M001_DEFAULT_HBLANK },
		{ MT9M001_VERTICAL_BLANKING, MT9M001_DEFAULT_VBLANK },
		/*
		 * The caller provides a supported format, as verified per
		 * call to .set_fmt(FORMAT_TRY).
		 */
		{ MT9M001_COLUMN_START, mt9m001->rect.left },
		{ MT9M001_ROW_START, mt9m001->rect.top },
		{ MT9M001_WINDOW_WIDTH, mt9m001->rect.width - 1 },
		{ MT9M001_WINDOW_HEIGHT,
			mt9m001->rect.height + mt9m001->y_skip_top - 1 },
	};

	return multi_reg_write(client, regs, ARRAY_SIZE(regs));
}

static int mt9m001_s_stream(struct v4l2_subdev *sd, int enable)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9m001 *mt9m001 = to_mt9m001(client);
	int ret = 0;

	mutex_lock(&mt9m001->mutex);

	if (mt9m001->streaming == enable)
		goto done;

	if (enable) {
		ret = pm_runtime_get_sync(&client->dev);
		if (ret < 0)
			goto put_unlock;

		ret = mt9m001_apply_selection(sd);
		if (ret)
			goto put_unlock;

		ret = __v4l2_ctrl_handler_setup(&mt9m001->hdl);
		if (ret)
			goto put_unlock;

		/* Switch to master "normal" mode */
		ret = reg_write(client, MT9M001_OUTPUT_CONTROL, 2);
		if (ret < 0)
			goto put_unlock;
	} else {
		/* Switch to master stop sensor readout */
		reg_write(client, MT9M001_OUTPUT_CONTROL, 0);
		pm_runtime_put(&client->dev);
	}

	mt9m001->streaming = enable;
done:
	mutex_unlock(&mt9m001->mutex);

	return 0;

put_unlock:
	pm_runtime_put(&client->dev);
	mutex_unlock(&mt9m001->mutex);

	return ret;
}

static int mt9m001_set_selection(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_selection *sel)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9m001 *mt9m001 = to_mt9m001(client);
	struct v4l2_rect rect = sel->r;

	if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE ||
	    sel->target != V4L2_SEL_TGT_CROP)
		return -EINVAL;

	if (mt9m001->fmts == mt9m001_colour_fmts)
		/*
		 * Bayer format - even number of rows for simplicity,
		 * but let the user play with the top row.
		 */
		rect.height = ALIGN(rect.height, 2);

	/* Datasheet requirement: see register description */
	rect.width = ALIGN(rect.width, 2);
	rect.left = ALIGN(rect.left, 2);

	rect.width = clamp_t(u32, rect.width, MT9M001_MIN_WIDTH,
			MT9M001_MAX_WIDTH);
	rect.left = clamp_t(u32, rect.left, MT9M001_COLUMN_SKIP,
			MT9M001_COLUMN_SKIP + MT9M001_MAX_WIDTH - rect.width);

	rect.height = clamp_t(u32, rect.height, MT9M001_MIN_HEIGHT,
			MT9M001_MAX_HEIGHT);
	rect.top = clamp_t(u32, rect.top, MT9M001_ROW_SKIP,
			MT9M001_ROW_SKIP + MT9M001_MAX_HEIGHT - rect.height);

	mt9m001->total_h = rect.height + mt9m001->y_skip_top +
			   MT9M001_DEFAULT_VBLANK;

	mt9m001->rect = rect;

	return 0;
}

static int mt9m001_get_selection(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_selection *sel)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9m001 *mt9m001 = to_mt9m001(client);

	if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
		return -EINVAL;

	switch (sel->target) {
	case V4L2_SEL_TGT_CROP_BOUNDS:
		sel->r.left = MT9M001_COLUMN_SKIP;
		sel->r.top = MT9M001_ROW_SKIP;
		sel->r.width = MT9M001_MAX_WIDTH;
		sel->r.height = MT9M001_MAX_HEIGHT;
		return 0;
	case V4L2_SEL_TGT_CROP:
		sel->r = mt9m001->rect;
		return 0;
	default:
		return -EINVAL;
	}
}

static int mt9m001_get_fmt(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_format *format)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9m001 *mt9m001 = to_mt9m001(client);
	struct v4l2_mbus_framefmt *mf = &format->format;

	if (format->pad)
		return -EINVAL;

	mf->width	= mt9m001->rect.width;
	mf->height	= mt9m001->rect.height;
	mf->code	= mt9m001->fmt->code;
	mf->colorspace	= mt9m001->fmt->colorspace;
	mf->field	= V4L2_FIELD_NONE;

	return 0;
}

static int mt9m001_s_fmt(struct v4l2_subdev *sd,
			 const struct mt9m001_datafmt *fmt,
			 struct v4l2_mbus_framefmt *mf)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9m001 *mt9m001 = to_mt9m001(client);
	struct v4l2_subdev_selection sel = {
		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
		.target = V4L2_SEL_TGT_CROP,
		.r.left = mt9m001->rect.left,
		.r.top = mt9m001->rect.top,
		.r.width = mf->width,
		.r.height = mf->height,
	};
	int ret;

	/* No support for scaling so far, just crop. TODO: use skipping */
	ret = mt9m001_set_selection(sd, NULL, &sel);
	if (!ret) {
		mf->width	= mt9m001->rect.width;
		mf->height	= mt9m001->rect.height;
		mt9m001->fmt	= fmt;
		mf->colorspace	= fmt->colorspace;
	}

	return ret;
}

static int mt9m001_set_fmt(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_format *format)
{
	struct v4l2_mbus_framefmt *mf = &format->format;
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct mt9m001 *mt9m001 = to_mt9m001(client);
	const struct mt9m001_datafmt *fmt;

	if (format->pad)
		return -EINVAL;

	v4l_bound_align_image(&mf->width, MT9M001_MIN_WIDTH,
		MT9M001_MAX_WIDTH, 1,
		&mf->height, MT9M001_MIN_HEIGHT + mt9m001->y_skip_top,
		MT9M001_MAX_HEIGHT + mt9m001->y_skip_top, 0, 0);

	if (mt9m001->fmts == mt9m001_colour_fmts)
		mf->height = ALIGN(mf->height - 1, 2);

	fmt = mt9m001_find_datafmt(mf->code, mt9m001->fmts,
				   mt9m001->num_fmts);
	if (!fmt) {
		fmt = mt9m001->fmt;
		mf->code = fmt->code;
	}

	mf->colorspace	= fmt->colorspace;

	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
		return mt9m001_s_fmt(sd, fmt, mf);
	cfg->try_fmt = *mf;
	return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int mt9m001_g_register(struct v4l2_subdev *sd,
			      struct v4l2_dbg_register *reg)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	if (reg->reg > 0xff)
		return -EINVAL;

	reg->size = 2;
	reg->val = reg_read(client, reg->reg);

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

	return 0;
}

static int mt9m001_s_register(struct v4l2_subdev *sd,
			      const struct v4l2_dbg_register *reg)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	if (reg->reg > 0xff)
		return -EINVAL;

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

	return 0;
}
#endif

static int mt9m001_power_on(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct mt9m001 *mt9m001 = to_mt9m001(client);
	int ret;

	ret = clk_prepare_enable(mt9m001->clk);
	if (ret)
		return ret;

	if (mt9m001->standby_gpio) {
		gpiod_set_value_cansleep(mt9m001->standby_gpio, 0);
		usleep_range(1000, 2000);
	}

	if (mt9m001->reset_gpio) {
		gpiod_set_value_cansleep(mt9m001->reset_gpio, 1);
		usleep_range(1000, 2000);


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