// SPDX-License-Identifier: GPL-2.0
/*
 * Support for T4KA3 8M camera sensor.
 *
 * Copyright (C) 2015 Intel Corporation. All Rights Reserved.
 * Copyright (C) 2016 XiaoMi, Inc.
 * Copyright (C) 2024 Hans de Goede <hansg@kernel.org>
 * Copyright (C) 2026 Kate Hsuan <hpa@redhat.com>
 */

#include <linux/acpi.h>
#include <linux/bits.h>
#include <linux/delay.h>
#include <linux/dev_printk.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/types.h>

#include <media/media-entity.h>
#include <media/v4l2-async.h>
#include <media/v4l2-cci.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-subdev.h>

#define T4KA3_NATIVE_WIDTH			3280
#define T4KA3_NATIVE_HEIGHT			2464
#define T4KA3_NATIVE_START_LEFT			0
#define T4KA3_NATIVE_START_TOP			0
#define T4KA3_ACTIVE_WIDTH			3280
#define T4KA3_ACTIVE_HEIGHT			2460
#define T4KA3_ACTIVE_START_LEFT			0
#define T4KA3_ACTIVE_START_TOP			2
#define T4KA3_MIN_CROP_WIDTH			2
#define T4KA3_MIN_CROP_HEIGHT			2

#define T4KA3_PIXELS_PER_LINE			3440
#define T4KA3_LINES_PER_FRAME_30FPS		2492
#define T4KA3_FPS				30
#define T4KA3_PIXEL_RATE \
	(T4KA3_PIXELS_PER_LINE * T4KA3_LINES_PER_FRAME_30FPS * T4KA3_FPS)

/*
 * TODO this really should be derived from the 19.2 MHz xvclk combined
 * with the PLL settings. But without a datasheet this is the closest
 * approximation possible.
 *
 * link-freq = pixel_rate * bpp / (lanes * 2)
 * (lanes * 2) because CSI lanes use double-data-rate (DDR) signalling.
 * bpp = 10 and lanes = 4
 */
#define T4KA3_LINK_FREQ				((u64)T4KA3_PIXEL_RATE * 10 / 8)

/* For enum_frame_size() full-size + binned-/quarter-size */
#define T4KA3_FRAME_SIZES			2

#define T4KA3_REG_PRODUCT_ID_HIGH		CCI_REG8(0x0000)
#define T4KA3_REG_PRODUCT_ID_LOW		CCI_REG8(0x0001)
#define T4KA3_PRODUCT_ID			0x1490

#define T4KA3_REG_STREAM			CCI_REG8(0x0100)
#define T4KA3_REG_IMG_ORIENTATION		CCI_REG8(0x0101)
#define T4KA3_HFLIP_BIT				BIT(0)
#define T4KA3_VFLIP_BIT				BIT(1)
#define T4KA3_REG_PARAM_HOLD			CCI_REG8(0x0104)
#define T4KA3_REG_COARSE_INTEGRATION_TIME	CCI_REG16(0x0202)
#define T4KA3_COARSE_INTEGRATION_TIME_MARGIN	6
#define T4KA3_REG_DIGGAIN_GREEN_R		CCI_REG16(0x020e)
#define T4KA3_REG_DIGGAIN_RED			CCI_REG16(0x0210)
#define T4KA3_REG_DIGGAIN_BLUE			CCI_REG16(0x0212)
#define T4KA3_REG_DIGGAIN_GREEN_B		CCI_REG16(0x0214)
#define T4KA3_REG_GLOBAL_GAIN			CCI_REG16(0x0234)
#define T4KA3_MIN_GLOBAL_GAIN_SUPPORTED		0x0080
#define T4KA3_MAX_GLOBAL_GAIN_SUPPORTED		0x07ff
#define T4KA3_REG_FRAME_LENGTH_LINES		CCI_REG16(0x0340) /* aka VTS */
/* FIXME: need a datasheet to verify the min + max vblank values */
#define T4KA3_MIN_VBLANK			4
#define T4KA3_MAX_VBLANK			0xffff
#define T4KA3_REG_PIXELS_PER_LINE		CCI_REG16(0x0342) /* aka HTS */
/* These 2 being horz/vert start is a guess (no datasheet), always 0 */
#define T4KA3_REG_HORZ_START			CCI_REG16(0x0344)
#define T4KA3_REG_VERT_START			CCI_REG16(0x0346)
/* Always 3279 (T4KA3_NATIVE_WIDTH - 1, window is used to crop */
#define T4KA3_REG_HORZ_END			CCI_REG16(0x0348)
/* Always 2463 (T4KA3_NATIVE_HEIGHT - 1, window is used to crop */
#define T4KA3_REG_VERT_END			CCI_REG16(0x034a)
/* Output size (after cropping/window) */
#define T4KA3_REG_HORZ_OUTPUT_SIZE		CCI_REG16(0x034c)
#define T4KA3_REG_VERT_OUTPUT_SIZE		CCI_REG16(0x034e)
/* Window/crop start + size *after* binning */
#define T4KA3_REG_WIN_START_X			CCI_REG16(0x0408)
#define T4KA3_REG_WIN_START_Y			CCI_REG16(0x040a)
#define T4KA3_REG_WIN_WIDTH			CCI_REG16(0x040c)
#define T4KA3_REG_WIN_HEIGHT			CCI_REG16(0x040e)
#define T4KA3_REG_TEST_PATTERN_MODE		CCI_REG8(0x0601)
/* Unknown register at address 0x0900 */
#define T4KA3_REG_0900				CCI_REG8(0x0900)
#define T4KA3_REG_BINNING			CCI_REG8(0x0901)
#define T4KA3_BINNING_VAL(_bin) \
({ \
	typeof(_bin) (b) = (_bin); \
	((b) << 4) | (b); \
})

#define to_t4ka3_sensor(_sd) container_of_const(_sd, \
						struct t4ka3_data, sd)
#define ctrl_to_t4ka3(_ctrl) container_of_const((_ctrl)->handler, \
						struct t4ka3_data, \
						ctrls.handler)

struct t4ka3_ctrls {
	struct v4l2_ctrl_handler handler;
	struct v4l2_ctrl *hflip;
	struct v4l2_ctrl *vflip;
	struct v4l2_ctrl *vblank;
	struct v4l2_ctrl *hblank;
	struct v4l2_ctrl *exposure;
	struct v4l2_ctrl *gain;
	struct v4l2_ctrl *test_pattern;
	struct v4l2_ctrl *link_freq;
	struct v4l2_ctrl *pixel_rate;
};

struct t4ka3_mode {
	int binning;
	u16 win_x;
	u16 win_y;
};

struct t4ka3_data {
	struct v4l2_subdev sd;
	struct media_pad pad;
	struct mutex lock; /* serialize sensor's ioctl */
	struct t4ka3_ctrls ctrls;
	struct t4ka3_mode mode;
	struct device *dev;
	struct regmap *regmap;
	struct gpio_desc *powerdown_gpio;
	struct gpio_desc *reset_gpio;
	int streaming;

	/* MIPI lane info */
	u32 link_freq_index;
	u8 mipi_lanes;
};

/* init settings */
static const struct cci_reg_sequence t4ka3_init_config[] = {
	{ CCI_REG8(0x4136), 0x13 },
	{ CCI_REG8(0x4137), 0x33 },
	{ CCI_REG8(0x3094), 0x01 },
	{ CCI_REG8(0x0233), 0x01 },
	{ CCI_REG8(0x4B06), 0x01 },
	{ CCI_REG8(0x4B07), 0x01 },
	{ CCI_REG8(0x3028), 0x01 },
	{ CCI_REG8(0x3032), 0x14 },
	{ CCI_REG8(0x305C), 0x0C },
	{ CCI_REG8(0x306D), 0x0A },
	{ CCI_REG8(0x3071), 0xFA },
	{ CCI_REG8(0x307E), 0x0A },
	{ CCI_REG8(0x307F), 0xFC },
	{ CCI_REG8(0x3091), 0x04 },
	{ CCI_REG8(0x3092), 0x60 },
	{ CCI_REG8(0x3096), 0xC0 },
	{ CCI_REG8(0x3100), 0x07 },
	{ CCI_REG8(0x3101), 0x4C },
	{ CCI_REG8(0x3118), 0xCC },
	{ CCI_REG8(0x3139), 0x06 },
	{ CCI_REG8(0x313A), 0x06 },
	{ CCI_REG8(0x313B), 0x04 },
	{ CCI_REG8(0x3143), 0x02 },
	{ CCI_REG8(0x314F), 0x0E },
	{ CCI_REG8(0x3169), 0x99 },
	{ CCI_REG8(0x316A), 0x99 },
	{ CCI_REG8(0x3171), 0x05 },
	{ CCI_REG8(0x31A1), 0xA7 },
	{ CCI_REG8(0x31A2), 0x9C },
	{ CCI_REG8(0x31A3), 0x8F },
	{ CCI_REG8(0x31A4), 0x75 },
	{ CCI_REG8(0x31A5), 0xEE },
	{ CCI_REG8(0x31A6), 0xEA },
	{ CCI_REG8(0x31A7), 0xE4 },
	{ CCI_REG8(0x31A8), 0xE4 },
	{ CCI_REG8(0x31DF), 0x05 },
	{ CCI_REG8(0x31EC), 0x1B },
	{ CCI_REG8(0x31ED), 0x1B },
	{ CCI_REG8(0x31EE), 0x1B },
	{ CCI_REG8(0x31F0), 0x1B },
	{ CCI_REG8(0x31F1), 0x1B },
	{ CCI_REG8(0x31F2), 0x1B },
	{ CCI_REG8(0x3204), 0x3F },
	{ CCI_REG8(0x3205), 0x03 },
	{ CCI_REG8(0x3210), 0x01 },
	{ CCI_REG8(0x3216), 0x68 },
	{ CCI_REG8(0x3217), 0x58 },
	{ CCI_REG8(0x3218), 0x58 },
	{ CCI_REG8(0x321A), 0x68 },
	{ CCI_REG8(0x321B), 0x60 },
	{ CCI_REG8(0x3238), 0x03 },
	{ CCI_REG8(0x3239), 0x03 },
	{ CCI_REG8(0x323A), 0x05 },
	{ CCI_REG8(0x323B), 0x06 },
	{ CCI_REG8(0x3243), 0x03 },
	{ CCI_REG8(0x3244), 0x08 },
	{ CCI_REG8(0x3245), 0x01 },
	{ CCI_REG8(0x3307), 0x19 },
	{ CCI_REG8(0x3308), 0x19 },
	{ CCI_REG8(0x3320), 0x01 },
	{ CCI_REG8(0x3326), 0x15 },
	{ CCI_REG8(0x3327), 0x0D },
	{ CCI_REG8(0x3328), 0x01 },
	{ CCI_REG8(0x3380), 0x01 },
	{ CCI_REG8(0x339E), 0x07 },
	{ CCI_REG8(0x3424), 0x00 },
	{ CCI_REG8(0x343C), 0x01 },
	{ CCI_REG8(0x3398), 0x04 },
	{ CCI_REG8(0x343A), 0x10 },
	{ CCI_REG8(0x339A), 0x22 },
	{ CCI_REG8(0x33B4), 0x00 },
	{ CCI_REG8(0x3393), 0x01 },
	{ CCI_REG8(0x33B3), 0x6E },
	{ CCI_REG8(0x3433), 0x06 },
	{ CCI_REG8(0x3433), 0x00 },
	{ CCI_REG8(0x33B3), 0x00 },
	{ CCI_REG8(0x3393), 0x03 },
	{ CCI_REG8(0x33B4), 0x03 },
	{ CCI_REG8(0x343A), 0x00 },
	{ CCI_REG8(0x339A), 0x00 },
	{ CCI_REG8(0x3398), 0x00 }
};

static const struct cci_reg_sequence t4ka3_pre_mode_set_regs[] = {
	{ CCI_REG8(0x0112), 0x0A },
	{ CCI_REG8(0x0113), 0x0A },
	{ CCI_REG8(0x0114), 0x03 },
	{ CCI_REG8(0x4136), 0x13 },
	{ CCI_REG8(0x4137), 0x33 },
	{ CCI_REG8(0x0820), 0x0A },
	{ CCI_REG8(0x0821), 0x0D },
	{ CCI_REG8(0x0822), 0x00 },
	{ CCI_REG8(0x0823), 0x00 },
	{ CCI_REG8(0x0301), 0x0A },
	{ CCI_REG8(0x0303), 0x01 },
	{ CCI_REG8(0x0305), 0x04 },
	{ CCI_REG8(0x0306), 0x02 },
	{ CCI_REG8(0x0307), 0x18 },
	{ CCI_REG8(0x030B), 0x01 },
};

static const struct cci_reg_sequence t4ka3_post_mode_set_regs[] = {
	{ CCI_REG8(0x0902), 0x00 },
	{ CCI_REG8(0x4220), 0x00 },
	{ CCI_REG8(0x4222), 0x01 },
	{ CCI_REG8(0x3380), 0x01 },
	{ CCI_REG8(0x3090), 0x88 },
	{ CCI_REG8(0x3394), 0x20 },
	{ CCI_REG8(0x3090), 0x08 },
	{ CCI_REG8(0x3394), 0x10 }
};

static const s64 link_freq_menu_items[] = {
	T4KA3_LINK_FREQ,
};

/* T4KA3 default GRBG */
static const int t4ka3_hv_flip_bayer_order[] = {
	MEDIA_BUS_FMT_SGRBG10_1X10,
	MEDIA_BUS_FMT_SBGGR10_1X10,
	MEDIA_BUS_FMT_SRGGB10_1X10,
	MEDIA_BUS_FMT_SGBRG10_1X10,
};

static const struct v4l2_rect t4ka3_default_crop = {
	.left = T4KA3_ACTIVE_START_LEFT,
	.top = T4KA3_ACTIVE_START_TOP,
	.width = T4KA3_ACTIVE_WIDTH,
	.height = T4KA3_ACTIVE_HEIGHT,
};

static void t4ka3_set_bayer_order(struct t4ka3_data *sensor,
				  struct v4l2_mbus_framefmt *fmt)
{
	unsigned int hv_flip = 0;

	if (sensor->ctrls.vflip && sensor->ctrls.vflip->val)
		hv_flip += 1;

	if (sensor->ctrls.hflip && sensor->ctrls.hflip->val)
		hv_flip += 2;

	fmt->code = t4ka3_hv_flip_bayer_order[hv_flip];
}

static int t4ka3_update_exposure_range(struct t4ka3_data *sensor,
				       struct v4l2_mbus_framefmt *fmt)
{
	int exp_max = fmt->height + sensor->ctrls.vblank->val -
		      T4KA3_COARSE_INTEGRATION_TIME_MARGIN;

	return __v4l2_ctrl_modify_range(sensor->ctrls.exposure, 0, exp_max,
					1, exp_max);
}

static void t4ka3_fill_format(struct t4ka3_data *sensor,
			      struct v4l2_mbus_framefmt *fmt,
			      unsigned int width, unsigned int height)
{
	memset(fmt, 0, sizeof(*fmt));
	fmt->width = width;
	fmt->height = height;
	fmt->field = V4L2_FIELD_NONE;
	fmt->colorspace = V4L2_COLORSPACE_RAW;
	t4ka3_set_bayer_order(sensor, fmt);
}

static void t4ka3_calc_mode(struct t4ka3_data *sensor,
			    struct v4l2_mbus_framefmt *fmt,
			    struct v4l2_rect *crop)
{
	int width;
	int height;
	int binning;

	width = fmt->width;
	height = fmt->height;

	if (width <= (crop->width / 2) && height <= (crop->height / 2))
		binning = 2;
	else
		binning = 1;

	width *= binning;
	height *= binning;

	sensor->mode.binning = binning;
	sensor->mode.win_x = (crop->left + (crop->width - width) / 2) & ~1;
	sensor->mode.win_y = (crop->top + (crop->height - height) / 2) & ~1;
	/*
	 * t4ka3's window is done after binning, but must still be a
	 * multiple of 2 ?
	 * Round up to avoid top 2 black lines in 1640x1230 (quarter res) case.
	 */
	sensor->mode.win_x = DIV_ROUND_UP(sensor->mode.win_x, binning);
	sensor->mode.win_y = DIV_ROUND_UP(sensor->mode.win_y, binning);
}

static void t4ka3_get_vblank_limits(struct t4ka3_data *sensor,
				    struct v4l2_subdev_state *state,
				    int *min, int *max, int *def)
{
	struct v4l2_mbus_framefmt *fmt = v4l2_subdev_state_get_format(state, 0);

	*min = T4KA3_MIN_VBLANK + (sensor->mode.binning - 1) * fmt->height;
	*max = T4KA3_MAX_VBLANK - fmt->height;
	*def = T4KA3_LINES_PER_FRAME_30FPS - fmt->height;
}

static int t4ka3_set_pad_format(struct v4l2_subdev *sd,
				struct v4l2_subdev_state *sd_state,
				struct v4l2_subdev_format *format)
{
	struct t4ka3_data *sensor = to_t4ka3_sensor(sd);
	struct v4l2_mbus_framefmt *fmt = &format->format;
	struct v4l2_rect *crop =
		v4l2_subdev_state_get_crop(sd_state, format->pad);
	unsigned int width, height;
	int min, max, def, ret = 0;

	/* Limit set_fmt max size to crop width / height */
	width = clamp_val(ALIGN(format->format.width, 2),
			  T4KA3_MIN_CROP_WIDTH, crop->width);
	height = clamp_val(ALIGN(format->format.height, 2),
			   T4KA3_MIN_CROP_HEIGHT, crop->height);
	t4ka3_fill_format(sensor, &format->format, width, height);

	if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE && sensor->streaming)
		return -EBUSY;

	*v4l2_subdev_state_get_format(sd_state, 0) = format->format;

	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
		return 0;

	t4ka3_calc_mode(sensor, fmt, crop);

	/* vblank range is height dependent adjust and reset to default */
	t4ka3_get_vblank_limits(sensor, sd_state, &min, &max, &def);
	ret = __v4l2_ctrl_modify_range(sensor->ctrls.vblank, min, max, 1, def);
	if (ret)
		return ret;

	ret = __v4l2_ctrl_s_ctrl(sensor->ctrls.vblank, def);
	if (ret)
		return ret;

	def = T4KA3_PIXELS_PER_LINE - fmt->width;
	ret = __v4l2_ctrl_modify_range(sensor->ctrls.hblank, def, def, 1, def);
	if (ret)
		return ret;

	return  __v4l2_ctrl_s_ctrl(sensor->ctrls.hblank, def);
}

/* Horizontal or vertically flip the image */
static int t4ka3_update_flip(struct v4l2_subdev *sd,
			     struct v4l2_mbus_framefmt *fmt,
			     int value, u8 flip_bit)
{
	struct t4ka3_data *sensor = to_t4ka3_sensor(sd);
	int ret;
	u64 val;

	if (sensor->streaming)
		return -EBUSY;

	val = value ? flip_bit : 0;

	ret = cci_update_bits(sensor->regmap, T4KA3_REG_IMG_ORIENTATION,
			      flip_bit, val, NULL);
	if (ret)
		return ret;

	t4ka3_set_bayer_order(sensor, fmt);

	return 0;
}

static int t4ka3_test_pattern(struct t4ka3_data *sensor, s32 value)
{
	return cci_write(sensor->regmap, T4KA3_REG_TEST_PATTERN_MODE,
			 value, NULL);
}

static int t4ka3_detect(struct t4ka3_data *sensor, u16 *id)
{
	struct i2c_client *client = v4l2_get_subdevdata(&sensor->sd);
	struct i2c_adapter *adapter = client->adapter;
	u64 high, low;
	int ret = 0;

	/* i2c check */
	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
		return -ENODEV;

	/* check sensor chip ID	 */
	cci_read(sensor->regmap, T4KA3_REG_PRODUCT_ID_HIGH, &high, &ret);
	cci_read(sensor->regmap, T4KA3_REG_PRODUCT_ID_LOW, &low, &ret);
	if (ret)
		return ret;

	*id = (((u8)high) << 8) | (u8)low;
	if (*id != T4KA3_PRODUCT_ID) {
		dev_err(sensor->dev, "main sensor t4ka3 ID error\n");
		return -ENODEV;
	}

	return 0;
}

static int t4ka3_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct t4ka3_data *sensor = ctrl_to_t4ka3(ctrl);
	struct v4l2_subdev_state *state =
			v4l2_subdev_get_locked_active_state(&sensor->sd);
	struct v4l2_mbus_framefmt *fmt =
			v4l2_subdev_state_get_format(state, 0);
	int ret;

	/* Update exposure range on vblank changes */
	if (ctrl->id == V4L2_CID_VBLANK) {
		ret = t4ka3_update_exposure_range(sensor, fmt);
		if (ret)
			return ret;
	}

	/* Only apply changes to the controls if the device is powered up */
	if (!pm_runtime_get_if_in_use(sensor->sd.dev))
		return 0;

	switch (ctrl->id) {
	case V4L2_CID_TEST_PATTERN:
		ret = t4ka3_test_pattern(sensor, ctrl->val);
		break;
	case V4L2_CID_VFLIP:
		ret = t4ka3_update_flip(&sensor->sd, fmt,
					ctrl->val, T4KA3_VFLIP_BIT);
		break;
	case V4L2_CID_HFLIP:
		ret = t4ka3_update_flip(&sensor->sd, fmt,
					ctrl->val, T4KA3_HFLIP_BIT);
		break;
	case V4L2_CID_VBLANK:
		ret = cci_write(sensor->regmap, T4KA3_REG_FRAME_LENGTH_LINES,
				fmt->height + ctrl->val, NULL);
		break;
	case V4L2_CID_EXPOSURE:
		ret = cci_write(sensor->regmap,
				T4KA3_REG_COARSE_INTEGRATION_TIME,
				ctrl->val, NULL);
		break;
	case V4L2_CID_ANALOGUE_GAIN:
		ret = cci_write(sensor->regmap, T4KA3_REG_GLOBAL_GAIN,
				ctrl->val, NULL);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	pm_runtime_put(sensor->sd.dev);

	return ret;
}

static int t4ka3_set_mode(struct t4ka3_data *sensor,
			  struct v4l2_subdev_state *state)
{
	struct v4l2_mbus_framefmt *fmt = v4l2_subdev_state_get_format(state, 0);
	int ret = 0;

	cci_write(sensor->regmap, T4KA3_REG_HORZ_OUTPUT_SIZE, fmt->width, &ret);
	/* Write mode-height - 2 otherwise things don't work, hw-bug ? */
	cci_write(sensor->regmap, T4KA3_REG_VERT_OUTPUT_SIZE,
		  fmt->height - 2, &ret);

	cci_write(sensor->regmap, T4KA3_REG_PIXELS_PER_LINE,
		  T4KA3_PIXELS_PER_LINE, &ret);
	/* Always use the full sensor, using window to crop */
	cci_write(sensor->regmap, T4KA3_REG_HORZ_START, 0, &ret);
	cci_write(sensor->regmap, T4KA3_REG_VERT_START, 0, &ret);
	cci_write(sensor->regmap, T4KA3_REG_HORZ_END,
		  T4KA3_NATIVE_WIDTH - 1, &ret);
	cci_write(sensor->regmap, T4KA3_REG_VERT_END,
		  T4KA3_NATIVE_HEIGHT - 1, &ret);
	/* Set window */
	cci_write(sensor->regmap, T4KA3_REG_WIN_START_X,
		  sensor->mode.win_x, &ret);
	cci_write(sensor->regmap, T4KA3_REG_WIN_START_Y,
		  sensor->mode.win_y, &ret);
	cci_write(sensor->regmap, T4KA3_REG_WIN_WIDTH, fmt->width, &ret);
	cci_write(sensor->regmap, T4KA3_REG_WIN_HEIGHT, fmt->height, &ret);
	/* Write 1 to unknown register 0x0900 */
	cci_write(sensor->regmap, T4KA3_REG_0900, 1, &ret);
	cci_write(sensor->regmap, T4KA3_REG_BINNING,
		  T4KA3_BINNING_VAL(sensor->mode.binning), &ret);

	return ret;
}

static int t4ka3_enable_stream(struct v4l2_subdev *sd,
			       struct v4l2_subdev_state *state,
			       u32 pad, u64 streams_mask)
{
	struct t4ka3_data *sensor = to_t4ka3_sensor(sd);
	int ret;

	ret = pm_runtime_get_sync(sensor->sd.dev);
	if (ret < 0) {
		dev_err(sensor->dev, "power-up err.\n");
		goto error_powerdown;
	}

	cci_multi_reg_write(sensor->regmap, t4ka3_init_config,
			    ARRAY_SIZE(t4ka3_init_config), &ret);
	/* enable group hold */
	cci_write(sensor->regmap, T4KA3_REG_PARAM_HOLD, 1, &ret);
	cci_multi_reg_write(sensor->regmap, t4ka3_pre_mode_set_regs,
			    ARRAY_SIZE(t4ka3_pre_mode_set_regs), &ret);
	if (ret)
		goto error_powerdown;

	ret = t4ka3_set_mode(sensor, state);
	if (ret)
		goto error_powerdown;

	ret = cci_multi_reg_write(sensor->regmap, t4ka3_post_mode_set_regs,
				  ARRAY_SIZE(t4ka3_post_mode_set_regs), NULL);
	if (ret)
		goto error_powerdown;

	/* Restore value of all ctrls */
	ret = __v4l2_ctrl_handler_setup(&sensor->ctrls.handler);
	if (ret)
		goto error_powerdown;

	/* disable group hold */
	cci_write(sensor->regmap, T4KA3_REG_PARAM_HOLD, 0, &ret);
	cci_write(sensor->regmap, T4KA3_REG_STREAM, 1, &ret);
	if (ret)
		goto error_powerdown;

	sensor->streaming = 1;

	return ret;

error_powerdown:
	pm_runtime_put(sensor->sd.dev);

	return ret;
}

static int t4ka3_disable_stream(struct v4l2_subdev *sd,
				struct v4l2_subdev_state *state,
				u32 pad, u64 streams_mask)
{
	struct t4ka3_data *sensor = to_t4ka3_sensor(sd);
	int ret;

	ret = cci_write(sensor->regmap, T4KA3_REG_STREAM, 0, NULL);
	pm_runtime_put(sensor->sd.dev);
	sensor->streaming = 0;

	if (ret)
		dev_err(sensor->dev,
			"failed to disable stream with return value: %d\n",
			ret);

	return 0;
}

static int t4ka3_get_selection(struct v4l2_subdev *sd,
			       struct v4l2_subdev_state *state,
			       struct v4l2_subdev_selection *sel)
{
	switch (sel->target) {
	case V4L2_SEL_TGT_CROP:
		sel->r = *v4l2_subdev_state_get_crop(state, sel->pad);
		break;
	case V4L2_SEL_TGT_NATIVE_SIZE:
	case V4L2_SEL_TGT_CROP_BOUNDS:
		sel->r.top = 0;
		sel->r.left = 0;
		sel->r.width = T4KA3_NATIVE_WIDTH;
		sel->r.height = T4KA3_NATIVE_HEIGHT;
		break;
	case V4L2_SEL_TGT_CROP_DEFAULT:
		sel->r = t4ka3_default_crop;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int t4ka3_set_selection(struct v4l2_subdev *sd,
			       struct v4l2_subdev_state *state,
			       struct v4l2_subdev_selection *sel)
{
	struct t4ka3_data *sensor = to_t4ka3_sensor(sd);
	struct v4l2_mbus_framefmt *format;
	struct v4l2_rect *crop;
	struct v4l2_rect rect;

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

	/*
	 * Clamp the boundaries of the crop rectangle to the size of the sensor
	 * pixel array. Align to multiples of 2 to ensure Bayer pattern isn't
	 * disrupted.
	 */
	rect.left = clamp_val(ALIGN(sel->r.left, 2),
			      T4KA3_NATIVE_START_LEFT, T4KA3_NATIVE_WIDTH);
	rect.top = clamp_val(ALIGN(sel->r.top, 2),
			     T4KA3_NATIVE_START_TOP, T4KA3_NATIVE_HEIGHT);
	rect.width = clamp_val(ALIGN(sel->r.width, 2), T4KA3_MIN_CROP_WIDTH,
			       T4KA3_NATIVE_WIDTH - rect.left);
	rect.height = clamp_val(ALIGN(sel->r.height, 2), T4KA3_MIN_CROP_HEIGHT,
				T4KA3_NATIVE_HEIGHT - rect.top);

	crop = v4l2_subdev_state_get_crop(state, sel->pad);

	if (rect.width != crop->width || rect.height != crop->height) {
		/*
		 * Reset the output image size if the crop rectangle size has
		 * been modified.
		 */
		format = v4l2_subdev_state_get_format(state, sel->pad);
		format->width = rect.width;
		format->height = rect.height;
		if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE)
			t4ka3_calc_mode(sensor, format, crop);
	}

	sel->r = *crop = rect;

	return 0;
}

static int
t4ka3_enum_mbus_code(struct v4l2_subdev *sd,
		     struct v4l2_subdev_state *sd_state,
		     struct v4l2_subdev_mbus_code_enum *code)
{
	if (code->index)
		return -EINVAL;

	code->code = MEDIA_BUS_FMT_SGRBG10_1X10;

	return 0;
}

static int t4ka3_enum_frame_size(struct v4l2_subdev *sd,
				 struct v4l2_subdev_state *sd_state,
				 struct v4l2_subdev_frame_size_enum *fse)
{
	struct v4l2_rect *crop;

	if (fse->index >= T4KA3_FRAME_SIZES)
		return -EINVAL;

	crop = v4l2_subdev_state_get_crop(sd_state, fse->pad);

	fse->min_width = crop->width / (fse->index + 1);
	fse->min_height = crop->height / (fse->index + 1);
	fse->max_width = fse->min_width;
	fse->max_height = fse->min_height;

	return 0;
}

static int t4ka3_check_hwcfg(struct t4ka3_data *sensor)
{
	struct fwnode_handle *fwnode = dev_fwnode(sensor->dev);
	struct v4l2_fwnode_endpoint bus_cfg = {
		.bus_type = V4L2_MBUS_CSI2_DPHY,
	};
	struct fwnode_handle *endpoint;
	unsigned long link_freq_bitmap;
	int ret;

	endpoint = fwnode_graph_get_next_endpoint(fwnode, NULL);

	ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &bus_cfg);
	fwnode_handle_put(endpoint);
	if (ret)
		return ret;

	ret = v4l2_link_freq_to_bitmap(sensor->dev, bus_cfg.link_frequencies,
				       bus_cfg.nr_of_link_frequencies,
				       link_freq_menu_items,
				       ARRAY_SIZE(link_freq_menu_items),
				       &link_freq_bitmap);

	if (ret < 0)
		goto out_free_bus_cfg;

	sensor->link_freq_index = ffs(link_freq_bitmap) - 1;

	/* 4 MIPI lanes */
	if (bus_cfg.bus.mipi_csi2.num_data_lanes != 4) {
		ret = dev_err_probe(sensor->dev, -EINVAL,
				    "number of CSI2 data lanes %u is not supported\n",
				    bus_cfg.bus.mipi_csi2.num_data_lanes);
		goto out_free_bus_cfg;
	}

	sensor->mipi_lanes = bus_cfg.bus.mipi_csi2.num_data_lanes;

out_free_bus_cfg:
	v4l2_fwnode_endpoint_free(&bus_cfg);

	return ret;
}

static int t4ka3_init_state(struct v4l2_subdev *sd,
			    struct v4l2_subdev_state *sd_state)
{
	struct t4ka3_data *sensor = to_t4ka3_sensor(sd);

	*v4l2_subdev_state_get_crop(sd_state, 0) = t4ka3_default_crop;

	t4ka3_fill_format(sensor, v4l2_subdev_state_get_format(sd_state, 0),
			  T4KA3_ACTIVE_WIDTH, T4KA3_ACTIVE_HEIGHT);
	return 0;
}

static const struct v4l2_ctrl_ops t4ka3_ctrl_ops = {
	.s_ctrl = t4ka3_s_ctrl,
};

static const struct v4l2_subdev_video_ops t4ka3_video_ops = {
	.s_stream = v4l2_subdev_s_stream_helper,
};

static const struct v4l2_subdev_pad_ops t4ka3_pad_ops = {
	.enum_mbus_code = t4ka3_enum_mbus_code,
	.enum_frame_size = t4ka3_enum_frame_size,
	.get_fmt = v4l2_subdev_get_fmt,
	.set_fmt = t4ka3_set_pad_format,
	.get_selection = t4ka3_get_selection,
	.set_selection = t4ka3_set_selection,
	.enable_streams = t4ka3_enable_stream,
	.disable_streams = t4ka3_disable_stream,
};

static const struct v4l2_subdev_ops t4ka3_ops = {
	.video = &t4ka3_video_ops,
	.pad = &t4ka3_pad_ops,
};

static const struct v4l2_subdev_internal_ops t4ka3_internal_ops = {
	.init_state = t4ka3_init_state,
};

static int t4ka3_init_controls(struct t4ka3_data *sensor)
{
	const struct v4l2_ctrl_ops *ops = &t4ka3_ctrl_ops;
	struct t4ka3_ctrls *ctrls = &sensor->ctrls;
	struct v4l2_subdev_state *state;
	struct v4l2_mbus_framefmt *fmt;
	struct v4l2_rect *crop;
	struct v4l2_ctrl_handler *hdl = &ctrls->handler;
	struct v4l2_fwnode_device_properties props;
	int ret, min, max, def;
	static const char * const test_pattern_menu[] = {
		"Disabled",
		"Solid White",
		"Color Bars",
		"Gradient",
		"Random Data",
	};

	v4l2_ctrl_handler_init(hdl, 11);

	hdl->lock = &sensor->lock;

	ctrls->vflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
	ctrls->hflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HFLIP, 0, 1, 1, 0);

	ctrls->test_pattern =
		v4l2_ctrl_new_std_menu_items(hdl, ops,
					     V4L2_CID_TEST_PATTERN,
					     ARRAY_SIZE(test_pattern_menu) - 1,
					     0, 0, test_pattern_menu);
	ctrls->link_freq = v4l2_ctrl_new_int_menu(hdl, NULL,
						  V4L2_CID_LINK_FREQ,
						  0, 0, link_freq_menu_items);
	ctrls->pixel_rate = v4l2_ctrl_new_std(hdl, NULL, V4L2_CID_PIXEL_RATE,
					      0, T4KA3_PIXEL_RATE,
					      1, T4KA3_PIXEL_RATE);

	state = v4l2_subdev_lock_and_get_active_state(&sensor->sd);
	fmt = v4l2_subdev_state_get_format(state, 0);
	crop = v4l2_subdev_state_get_crop(state, 0);

	t4ka3_calc_mode(sensor, fmt, crop);
	t4ka3_get_vblank_limits(sensor, state, &min, &max, &def);

	v4l2_subdev_unlock_state(state);

	ctrls->vblank = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VBLANK,
					  min, max, 1, def);

	def = T4KA3_PIXELS_PER_LINE - T4KA3_ACTIVE_WIDTH;
	ctrls->hblank = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HBLANK,
					  def, def, 1, def);

	max = T4KA3_LINES_PER_FRAME_30FPS -
	      T4KA3_COARSE_INTEGRATION_TIME_MARGIN;
	ctrls->exposure = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_EXPOSURE,
					    0, max, 1, max);

	ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_ANALOGUE_GAIN,
					T4KA3_MIN_GLOBAL_GAIN_SUPPORTED,
					T4KA3_MAX_GLOBAL_GAIN_SUPPORTED,
					1, T4KA3_MIN_GLOBAL_GAIN_SUPPORTED);

	ret = v4l2_fwnode_device_parse(sensor->dev, &props);
	if (ret)
		return ret;

	v4l2_ctrl_new_fwnode_properties(hdl, ops, &props);

	if (hdl->error)
		return hdl->error;

	ctrls->vflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
	ctrls->hflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;
	ctrls->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
	ctrls->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	sensor->sd.ctrl_handler = hdl;

	return 0;
}

static int t4ka3_pm_suspend(struct device *dev)
{
	struct t4ka3_data *sensor = dev_get_drvdata(dev);

	gpiod_set_value_cansleep(sensor->powerdown_gpio, 1);
	gpiod_set_value_cansleep(sensor->reset_gpio, 1);

	return 0;
}

static int t4ka3_pm_resume(struct device *dev)
{
	struct t4ka3_data *sensor = dev_get_drvdata(dev);
	u16 sensor_id;
	int ret;

	usleep_range(5000, 6000);

	gpiod_set_value_cansleep(sensor->powerdown_gpio, 0);
	gpiod_set_value_cansleep(sensor->reset_gpio, 0);

	/* waiting for the sensor after powering up */
	fsleep(20000);

	ret = t4ka3_detect(sensor, &sensor_id);
	if (ret) {
		dev_err(sensor->dev, "sensor detect failed\n");
		gpiod_set_value_cansleep(sensor->powerdown_gpio, 1);
		gpiod_set_value_cansleep(sensor->reset_gpio, 1);

		return ret;
	}

	return 0;
}

static DEFINE_RUNTIME_DEV_PM_OPS(t4ka3_pm_ops, t4ka3_pm_suspend,
				 t4ka3_pm_resume, NULL);

static void t4ka3_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct t4ka3_data *sensor = to_t4ka3_sensor(sd);

	v4l2_async_unregister_subdev(&sensor->sd);
	v4l2_ctrl_handler_free(&sensor->ctrls.handler);
	v4l2_subdev_cleanup(sd);
	media_entity_cleanup(&sensor->sd.entity);

	/*
	 * Disable runtime PM. In case runtime PM is disabled in the kernel,
	 * make sure to turn power off manually.
	 */
	pm_runtime_disable(&client->dev);
	if (!pm_runtime_status_suspended(&client->dev))
		t4ka3_pm_suspend(&client->dev);
	pm_runtime_set_suspended(&client->dev);
}

static int t4ka3_probe(struct i2c_client *client)
{
	struct t4ka3_data *sensor;
	int ret;

	/* allocate sensor device & init sub device */
	sensor = devm_kzalloc(&client->dev, sizeof(*sensor), GFP_KERNEL);
	if (!sensor)
		return -ENOMEM;

	sensor->dev = &client->dev;

	ret = t4ka3_check_hwcfg(sensor);
	if (ret)
		return ret;

	mutex_init(&sensor->lock);

	v4l2_i2c_subdev_init(&sensor->sd, client, &t4ka3_ops);
	sensor->sd.internal_ops = &t4ka3_internal_ops;

	sensor->powerdown_gpio = devm_gpiod_get(&client->dev, "powerdown",
						GPIOD_OUT_HIGH);
	if (IS_ERR(sensor->powerdown_gpio))
		return dev_err_probe(&client->dev,
				     PTR_ERR(sensor->powerdown_gpio),
				     "getting powerdown GPIO\n");

	sensor->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
						     GPIOD_OUT_HIGH);
	if (IS_ERR(sensor->reset_gpio))
		return dev_err_probe(&client->dev, PTR_ERR(sensor->reset_gpio),
				     "getting reset GPIO\n");

	sensor->regmap = devm_cci_regmap_init_i2c(client, 16);
	if (IS_ERR(sensor->regmap))
		return PTR_ERR(sensor->regmap);

	ret = t4ka3_pm_resume(sensor->dev);
	if (ret)
		return ret;

	pm_runtime_set_active(&client->dev);
	pm_runtime_enable(&client->dev);

	sensor->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
	sensor->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;

	ret = media_entity_pads_init(&sensor->sd.entity, 1, &sensor->pad);
	if (ret)
		goto err_pm_disable;

	sensor->sd.state_lock = sensor->ctrls.handler.lock;
	ret = v4l2_subdev_init_finalize(&sensor->sd);
	if (ret < 0) {
		dev_err(&client->dev, "failed to init subdev: %d", ret);
		goto err_media_entity;
	}

	ret = t4ka3_init_controls(sensor);
	if (ret)
		goto err_controls;

	ret = v4l2_async_register_subdev_sensor(&sensor->sd);
	if (ret)
		goto err_controls;

	pm_runtime_set_autosuspend_delay(&client->dev, 1000);
	pm_runtime_idle(&client->dev);

	return 0;

err_controls:
	v4l2_ctrl_handler_free(&sensor->ctrls.handler);
	v4l2_subdev_cleanup(&sensor->sd);

err_media_entity:
	media_entity_cleanup(&sensor->sd.entity);

err_pm_disable:
	pm_runtime_disable(&client->dev);
	pm_runtime_put_noidle(&client->dev);
	t4ka3_pm_suspend(&client->dev);

	return ret;
}

static const struct acpi_device_id t4ka3_acpi_match[] = {
	{ "XMCC0003" },
	{}
};
MODULE_DEVICE_TABLE(acpi, t4ka3_acpi_match);

static struct i2c_driver t4ka3_driver = {
	.driver = {
		.name = "t4ka3",
		.acpi_match_table = ACPI_PTR(t4ka3_acpi_match),
		.pm = pm_sleep_ptr(&t4ka3_pm_ops),
	},
	.probe = t4ka3_probe,
	.remove = t4ka3_remove,
};
module_i2c_driver(t4ka3_driver)

MODULE_DESCRIPTION("A low-level driver for T4KA3 sensor");
MODULE_AUTHOR("HARVEY LV <harvey.lv@intel.com>");
MODULE_AUTHOR("Kate Hsuan <hpa@redhat.com>");
MODULE_LICENSE("GPL");