// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2013 Intel Corporation. All Rights Reserved.
 *
 * Adapted from the atomisp-ov5693 driver, with contributions from:
 *
 * Daniel Scally
 * Jean-Michel Hautbois
 * Fabian Wuthrich
 * Tsuchiya Yuto
 * Jordan Hand
 * Jake Day
 */

#include <asm/unaligned.h>
#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>

#define OV5693_REG_8BIT(n)			((1 << 16) | (n))
#define OV5693_REG_16BIT(n)			((2 << 16) | (n))
#define OV5693_REG_24BIT(n)			((3 << 16) | (n))
#define OV5693_REG_SIZE_SHIFT			16
#define OV5693_REG_ADDR_MASK			0xffff

/* System Control */
#define OV5693_SW_RESET_REG			OV5693_REG_8BIT(0x0103)
#define OV5693_SW_STREAM_REG			OV5693_REG_8BIT(0x0100)
#define OV5693_START_STREAMING			0x01
#define OV5693_STOP_STREAMING			0x00
#define OV5693_SW_RESET				0x01

#define OV5693_REG_CHIP_ID			OV5693_REG_16BIT(0x300a)
/* Yes, this is right. The datasheet for the OV5693 gives its ID as 0x5690 */
#define OV5693_CHIP_ID				0x5690

/* Exposure */
#define OV5693_EXPOSURE_CTRL_REG		OV5693_REG_24BIT(0x3500)
#define OV5693_EXPOSURE_CTRL_MASK		GENMASK(19, 4)
#define OV5693_INTEGRATION_TIME_MARGIN		8
#define OV5693_EXPOSURE_MIN			1
#define OV5693_EXPOSURE_STEP			1

/* Analogue Gain */
#define OV5693_GAIN_CTRL_REG			OV5693_REG_16BIT(0x350a)
#define OV5693_GAIN_CTRL_MASK			GENMASK(10, 4)
#define OV5693_GAIN_MIN				1
#define OV5693_GAIN_MAX				127
#define OV5693_GAIN_DEF				8
#define OV5693_GAIN_STEP			1

/* Digital Gain */
#define OV5693_MWB_RED_GAIN_REG			OV5693_REG_16BIT(0x3400)
#define OV5693_MWB_GREEN_GAIN_REG		OV5693_REG_16BIT(0x3402)
#define OV5693_MWB_BLUE_GAIN_REG		OV5693_REG_16BIT(0x3404)
#define OV5693_MWB_GAIN_MASK			GENMASK(11, 0)
#define OV5693_MWB_GAIN_MAX			0x0fff
#define OV5693_DIGITAL_GAIN_MIN			1
#define OV5693_DIGITAL_GAIN_MAX			4095
#define OV5693_DIGITAL_GAIN_DEF			1024
#define OV5693_DIGITAL_GAIN_STEP		1

/* Timing and Format */
#define OV5693_CROP_START_X_REG			OV5693_REG_16BIT(0x3800)
#define OV5693_CROP_START_Y_REG			OV5693_REG_16BIT(0x3802)
#define OV5693_CROP_END_X_REG			OV5693_REG_16BIT(0x3804)
#define OV5693_CROP_END_Y_REG			OV5693_REG_16BIT(0x3806)
#define OV5693_OUTPUT_SIZE_X_REG		OV5693_REG_16BIT(0x3808)
#define OV5693_OUTPUT_SIZE_Y_REG		OV5693_REG_16BIT(0x380a)

#define OV5693_TIMING_HTS_REG			OV5693_REG_16BIT(0x380c)
#define OV5693_FIXED_PPL			2688U
#define OV5693_TIMING_VTS_REG			OV5693_REG_16BIT(0x380e)
#define OV5693_TIMING_MAX_VTS			0xffff
#define OV5693_TIMING_MIN_VTS			0x04

#define OV5693_OFFSET_START_X_REG		OV5693_REG_16BIT(0x3810)
#define OV5693_OFFSET_START_Y_REG		OV5693_REG_16BIT(0x3812)

#define OV5693_SUB_INC_X_REG			OV5693_REG_8BIT(0x3814)
#define OV5693_SUB_INC_Y_REG			OV5693_REG_8BIT(0x3815)

#define OV5693_FORMAT1_REG			OV5693_REG_8BIT(0x3820)
#define OV5693_FORMAT1_FLIP_VERT_ISP_EN		BIT(6)
#define OV5693_FORMAT1_FLIP_VERT_SENSOR_EN	BIT(1)
#define OV5693_FORMAT1_VBIN_EN			BIT(0)
#define OV5693_FORMAT2_REG			OV5693_REG_8BIT(0x3821)
#define OV5693_FORMAT2_HDR_EN			BIT(7)
#define OV5693_FORMAT2_FLIP_HORZ_ISP_EN		BIT(2)
#define OV5693_FORMAT2_FLIP_HORZ_SENSOR_EN	BIT(1)
#define OV5693_FORMAT2_HBIN_EN			BIT(0)

#define OV5693_ISP_CTRL2_REG			OV5693_REG_8BIT(0x5002)
#define OV5693_ISP_SCALE_ENABLE			BIT(7)

/* Pixel Array */
#define OV5693_NATIVE_WIDTH			2624
#define OV5693_NATIVE_HEIGHT			1956
#define OV5693_NATIVE_START_LEFT		0
#define OV5693_NATIVE_START_TOP			0
#define OV5693_ACTIVE_WIDTH			2592
#define OV5693_ACTIVE_HEIGHT			1944
#define OV5693_ACTIVE_START_LEFT		16
#define OV5693_ACTIVE_START_TOP			6
#define OV5693_MIN_CROP_WIDTH			2
#define OV5693_MIN_CROP_HEIGHT			2

/* Test Pattern */
#define OV5693_TEST_PATTERN_REG			OV5693_REG_8BIT(0x5e00)
#define OV5693_TEST_PATTERN_ENABLE		BIT(7)
#define OV5693_TEST_PATTERN_ROLLING		BIT(6)
#define OV5693_TEST_PATTERN_RANDOM		0x01
#define OV5693_TEST_PATTERN_BARS		0x00

/* System Frequencies */
#define OV5693_XVCLK_FREQ			19200000
#define OV5693_LINK_FREQ_419_2MHZ		419200000
#define OV5693_PIXEL_RATE			167680000

/* Miscellaneous */
#define OV5693_NUM_SUPPLIES			2

#define to_ov5693_sensor(x) container_of(x, struct ov5693_device, sd)

struct ov5693_reg {
	u32 reg;
	u8 val;
};

struct ov5693_reg_list {
	u32 num_regs;
	const struct ov5693_reg *regs;
};

struct ov5693_device {
	struct i2c_client *client;
	struct device *dev;

	/* Protect against concurrent changes to controls */
	struct mutex lock;

	struct gpio_desc *reset;
	struct gpio_desc *powerdown;
	struct regulator_bulk_data supplies[OV5693_NUM_SUPPLIES];
	struct clk *clk;

	struct ov5693_mode {
		struct v4l2_rect crop;
		struct v4l2_mbus_framefmt format;
		bool binning_x;
		bool binning_y;
		unsigned int inc_x_odd;
		unsigned int inc_y_odd;
		unsigned int vts;
	} mode;
	bool streaming;

	struct v4l2_subdev sd;
	struct media_pad pad;

	struct ov5693_v4l2_ctrls {
		struct v4l2_ctrl_handler handler;
		struct v4l2_ctrl *link_freq;
		struct v4l2_ctrl *pixel_rate;
		struct v4l2_ctrl *exposure;
		struct v4l2_ctrl *analogue_gain;
		struct v4l2_ctrl *digital_gain;
		struct v4l2_ctrl *hflip;
		struct v4l2_ctrl *vflip;
		struct v4l2_ctrl *hblank;
		struct v4l2_ctrl *vblank;
		struct v4l2_ctrl *test_pattern;
	} ctrls;
};

static const struct ov5693_reg ov5693_global_regs[] = {
	{OV5693_REG_8BIT(0x3016), 0xf0},
	{OV5693_REG_8BIT(0x3017), 0xf0},
	{OV5693_REG_8BIT(0x3018), 0xf0},
	{OV5693_REG_8BIT(0x3022), 0x01},
	{OV5693_REG_8BIT(0x3028), 0x44},
	{OV5693_REG_8BIT(0x3098), 0x02},
	{OV5693_REG_8BIT(0x3099), 0x19},
	{OV5693_REG_8BIT(0x309a), 0x02},
	{OV5693_REG_8BIT(0x309b), 0x01},
	{OV5693_REG_8BIT(0x309c), 0x00},
	{OV5693_REG_8BIT(0x30a0), 0xd2},
	{OV5693_REG_8BIT(0x30a2), 0x01},
	{OV5693_REG_8BIT(0x30b2), 0x00},
	{OV5693_REG_8BIT(0x30b3), 0x83},
	{OV5693_REG_8BIT(0x30b4), 0x03},
	{OV5693_REG_8BIT(0x30b5), 0x04},
	{OV5693_REG_8BIT(0x30b6), 0x01},
	{OV5693_REG_8BIT(0x3080), 0x01},
	{OV5693_REG_8BIT(0x3104), 0x21},
	{OV5693_REG_8BIT(0x3106), 0x00},
	{OV5693_REG_8BIT(0x3406), 0x01},
	{OV5693_REG_8BIT(0x3503), 0x07},
	{OV5693_REG_8BIT(0x350b), 0x40},
	{OV5693_REG_8BIT(0x3601), 0x0a},
	{OV5693_REG_8BIT(0x3602), 0x38},
	{OV5693_REG_8BIT(0x3612), 0x80},
	{OV5693_REG_8BIT(0x3620), 0x54},
	{OV5693_REG_8BIT(0x3621), 0xc7},
	{OV5693_REG_8BIT(0x3622), 0x0f},
	{OV5693_REG_8BIT(0x3625), 0x10},
	{OV5693_REG_8BIT(0x3630), 0x55},
	{OV5693_REG_8BIT(0x3631), 0xf4},
	{OV5693_REG_8BIT(0x3632), 0x00},
	{OV5693_REG_8BIT(0x3633), 0x34},
	{OV5693_REG_8BIT(0x3634), 0x02},
	{OV5693_REG_8BIT(0x364d), 0x0d},
	{OV5693_REG_8BIT(0x364f), 0xdd},
	{OV5693_REG_8BIT(0x3660), 0x04},
	{OV5693_REG_8BIT(0x3662), 0x10},
	{OV5693_REG_8BIT(0x3663), 0xf1},
	{OV5693_REG_8BIT(0x3665), 0x00},
	{OV5693_REG_8BIT(0x3666), 0x20},
	{OV5693_REG_8BIT(0x3667), 0x00},
	{OV5693_REG_8BIT(0x366a), 0x80},
	{OV5693_REG_8BIT(0x3680), 0xe0},
	{OV5693_REG_8BIT(0x3681), 0x00},
	{OV5693_REG_8BIT(0x3700), 0x42},
	{OV5693_REG_8BIT(0x3701), 0x14},
	{OV5693_REG_8BIT(0x3702), 0xa0},
	{OV5693_REG_8BIT(0x3703), 0xd8},
	{OV5693_REG_8BIT(0x3704), 0x78},
	{OV5693_REG_8BIT(0x3705), 0x02},
	{OV5693_REG_8BIT(0x370a), 0x00},
	{OV5693_REG_8BIT(0x370b), 0x20},
	{OV5693_REG_8BIT(0x370c), 0x0c},
	{OV5693_REG_8BIT(0x370d), 0x11},
	{OV5693_REG_8BIT(0x370e), 0x00},
	{OV5693_REG_8BIT(0x370f), 0x40},
	{OV5693_REG_8BIT(0x3710), 0x00},
	{OV5693_REG_8BIT(0x371a), 0x1c},
	{OV5693_REG_8BIT(0x371b), 0x05},
	{OV5693_REG_8BIT(0x371c), 0x01},
	{OV5693_REG_8BIT(0x371e), 0xa1},
	{OV5693_REG_8BIT(0x371f), 0x0c},
	{OV5693_REG_8BIT(0x3721), 0x00},
	{OV5693_REG_8BIT(0x3724), 0x10},
	{OV5693_REG_8BIT(0x3726), 0x00},
	{OV5693_REG_8BIT(0x372a), 0x01},
	{OV5693_REG_8BIT(0x3730), 0x10},
	{OV5693_REG_8BIT(0x3738), 0x22},
	{OV5693_REG_8BIT(0x3739), 0xe5},
	{OV5693_REG_8BIT(0x373a), 0x50},
	{OV5693_REG_8BIT(0x373b), 0x02},
	{OV5693_REG_8BIT(0x373c), 0x41},
	{OV5693_REG_8BIT(0x373f), 0x02},
	{OV5693_REG_8BIT(0x3740), 0x42},
	{OV5693_REG_8BIT(0x3741), 0x02},
	{OV5693_REG_8BIT(0x3742), 0x18},
	{OV5693_REG_8BIT(0x3743), 0x01},
	{OV5693_REG_8BIT(0x3744), 0x02},
	{OV5693_REG_8BIT(0x3747), 0x10},
	{OV5693_REG_8BIT(0x374c), 0x04},
	{OV5693_REG_8BIT(0x3751), 0xf0},
	{OV5693_REG_8BIT(0x3752), 0x00},
	{OV5693_REG_8BIT(0x3753), 0x00},
	{OV5693_REG_8BIT(0x3754), 0xc0},
	{OV5693_REG_8BIT(0x3755), 0x00},
	{OV5693_REG_8BIT(0x3756), 0x1a},
	{OV5693_REG_8BIT(0x3758), 0x00},
	{OV5693_REG_8BIT(0x3759), 0x0f},
	{OV5693_REG_8BIT(0x376b), 0x44},
	{OV5693_REG_8BIT(0x375c), 0x04},
	{OV5693_REG_8BIT(0x3774), 0x10},
	{OV5693_REG_8BIT(0x3776), 0x00},
	{OV5693_REG_8BIT(0x377f), 0x08},
	{OV5693_REG_8BIT(0x3780), 0x22},
	{OV5693_REG_8BIT(0x3781), 0x0c},
	{OV5693_REG_8BIT(0x3784), 0x2c},
	{OV5693_REG_8BIT(0x3785), 0x1e},
	{OV5693_REG_8BIT(0x378f), 0xf5},
	{OV5693_REG_8BIT(0x3791), 0xb0},
	{OV5693_REG_8BIT(0x3795), 0x00},
	{OV5693_REG_8BIT(0x3796), 0x64},
	{OV5693_REG_8BIT(0x3797), 0x11},
	{OV5693_REG_8BIT(0x3798), 0x30},
	{OV5693_REG_8BIT(0x3799), 0x41},
	{OV5693_REG_8BIT(0x379a), 0x07},
	{OV5693_REG_8BIT(0x379b), 0xb0},
	{OV5693_REG_8BIT(0x379c), 0x0c},
	{OV5693_REG_8BIT(0x3a04), 0x06},
	{OV5693_REG_8BIT(0x3a05), 0x14},
	{OV5693_REG_8BIT(0x3e07), 0x20},
	{OV5693_REG_8BIT(0x4000), 0x08},
	{OV5693_REG_8BIT(0x4001), 0x04},
	{OV5693_REG_8BIT(0x4004), 0x08},
	{OV5693_REG_8BIT(0x4006), 0x20},
	{OV5693_REG_8BIT(0x4008), 0x24},
	{OV5693_REG_8BIT(0x4009), 0x10},
	{OV5693_REG_8BIT(0x4058), 0x00},
	{OV5693_REG_8BIT(0x4101), 0xb2},
	{OV5693_REG_8BIT(0x4307), 0x31},
	{OV5693_REG_8BIT(0x4511), 0x05},
	{OV5693_REG_8BIT(0x4512), 0x01},
	{OV5693_REG_8BIT(0x481f), 0x30},
	{OV5693_REG_8BIT(0x4826), 0x2c},
	{OV5693_REG_8BIT(0x4d02), 0xfd},
	{OV5693_REG_8BIT(0x4d03), 0xf5},
	{OV5693_REG_8BIT(0x4d04), 0x0c},
	{OV5693_REG_8BIT(0x4d05), 0xcc},
	{OV5693_REG_8BIT(0x4837), 0x0a},
	{OV5693_REG_8BIT(0x5003), 0x20},
	{OV5693_REG_8BIT(0x5013), 0x00},
	{OV5693_REG_8BIT(0x5842), 0x01},
	{OV5693_REG_8BIT(0x5843), 0x2b},
	{OV5693_REG_8BIT(0x5844), 0x01},
	{OV5693_REG_8BIT(0x5845), 0x92},
	{OV5693_REG_8BIT(0x5846), 0x01},
	{OV5693_REG_8BIT(0x5847), 0x8f},
	{OV5693_REG_8BIT(0x5848), 0x01},
	{OV5693_REG_8BIT(0x5849), 0x0c},
	{OV5693_REG_8BIT(0x5e10), 0x0c},
	{OV5693_REG_8BIT(0x3820), 0x00},
	{OV5693_REG_8BIT(0x3821), 0x1e},
	{OV5693_REG_8BIT(0x5041), 0x14}
};

static const struct ov5693_reg_list ov5693_global_setting = {
	.num_regs = ARRAY_SIZE(ov5693_global_regs),
	.regs = ov5693_global_regs,
};

static const struct v4l2_rect ov5693_default_crop = {
	.left = OV5693_ACTIVE_START_LEFT,
	.top = OV5693_ACTIVE_START_TOP,
	.width = OV5693_ACTIVE_WIDTH,
	.height = OV5693_ACTIVE_HEIGHT,
};

static const struct v4l2_mbus_framefmt ov5693_default_fmt = {
	.width = OV5693_ACTIVE_WIDTH,
	.height = OV5693_ACTIVE_HEIGHT,
	.code = MEDIA_BUS_FMT_SBGGR10_1X10,
};

static const s64 link_freq_menu_items[] = {
	OV5693_LINK_FREQ_419_2MHZ
};

static const char * const ov5693_supply_names[] = {
	"avdd",
	"dovdd",
};

static const char * const ov5693_test_pattern_menu[] = {
	"Disabled",
	"Random Data",
	"Colour Bars",
	"Colour Bars with Rolling Bar"
};

static const u8 ov5693_test_pattern_bits[] = {
	0,
	OV5693_TEST_PATTERN_ENABLE | OV5693_TEST_PATTERN_RANDOM,
	OV5693_TEST_PATTERN_ENABLE | OV5693_TEST_PATTERN_BARS,
	OV5693_TEST_PATTERN_ENABLE | OV5693_TEST_PATTERN_BARS |
	OV5693_TEST_PATTERN_ROLLING,
};

/* I2C I/O Operations */

static int ov5693_read_reg(struct ov5693_device *ov5693, u32 addr, u32 *value)
{
	struct i2c_client *client = ov5693->client;
	__be16 reg;
	u8 val[4];
	struct i2c_msg msg[] = {
		{
			.addr	= client->addr,
			.flags	= 0,
			.len	= 2,
			.buf	= (u8 *)&reg,
		},
		{
			.addr	= client->addr,
			.flags	= I2C_M_RD,
			.buf	= (u8 *)&val,
		},
	};
	unsigned int len = ((addr >> OV5693_REG_SIZE_SHIFT) & 3);
	unsigned int i;
	int ret;

	reg = cpu_to_be16(addr & OV5693_REG_ADDR_MASK);

	msg[1].len = len;

	ret = i2c_transfer(client->adapter, msg, 2);
	if (ret < 0)
		return dev_err_probe(&client->dev, ret,
				     "Failed to read register 0x%04x: %d\n",
				     addr & OV5693_REG_ADDR_MASK, ret);

	*value = 0;
	for (i = 0; i < len; ++i) {
		*value <<= 8;
		*value |= val[i];
	}

	return 0;
}

static void ov5693_write_reg(struct ov5693_device *ov5693, u32 addr, u32 value,
			     int *error)
{
	struct i2c_client *client = ov5693->client;
	struct {
		__be16 reg;
		u8 val[4];
	} __packed buf;
	struct i2c_msg msg = {
		.addr	= client->addr,
		.buf	= (u8 *)&buf,
	};
	unsigned int len = ((addr >> OV5693_REG_SIZE_SHIFT) & 3);
	unsigned int i;
	int ret;

	if (*error < 0)
		return;

	buf.reg = cpu_to_be16(addr & OV5693_REG_ADDR_MASK);
	for (i = 0; i < len; ++i) {
		buf.val[len - i - 1] = value & 0xff;
		value >>= 8;
	}

	msg.len	= len + 2;

	ret = i2c_transfer(client->adapter, &msg, 1);
	if (ret < 0) {
		dev_err(&client->dev, "Failed to write register 0x%04x: %d\n",
			addr & OV5693_REG_ADDR_MASK, ret);
		*error = ret;
	}
}

static int ov5693_write_reg_array(struct ov5693_device *ov5693,
				  const struct ov5693_reg_list *reglist)
{
	unsigned int i;
	int ret = 0;

	for (i = 0; i < reglist->num_regs; i++)
		ov5693_write_reg(ov5693, reglist->regs[i].reg,
				 reglist->regs[i].val, &ret);

	return ret;
}

static int ov5693_update_bits(struct ov5693_device *ov5693, u32 address,
			      u32 mask, u32 bits)
{
	u32 value = 0;
	int ret;

	ret = ov5693_read_reg(ov5693, address, &value);
	if (ret)
		return ret;

	value &= ~mask;
	value |= bits;

	ov5693_write_reg(ov5693, address, value, &ret);

	return ret;
}

/* V4L2 Controls Functions */

static int ov5693_flip_vert_configure(struct ov5693_device *ov5693,
				      bool enable)
{
	u8 bits = OV5693_FORMAT1_FLIP_VERT_ISP_EN |
		  OV5693_FORMAT1_FLIP_VERT_SENSOR_EN;
	int ret;

	ret = ov5693_update_bits(ov5693, OV5693_FORMAT1_REG, bits,
				 enable ? bits : 0);
	if (ret)
		return ret;

	return 0;
}

static int ov5693_flip_horz_configure(struct ov5693_device *ov5693,
				      bool enable)
{
	u8 bits = OV5693_FORMAT2_FLIP_HORZ_ISP_EN |
		  OV5693_FORMAT2_FLIP_HORZ_SENSOR_EN;
	int ret;

	ret = ov5693_update_bits(ov5693, OV5693_FORMAT2_REG, bits,
				 enable ? bits : 0);
	if (ret)
		return ret;

	return 0;
}

static int ov5693_get_exposure(struct ov5693_device *ov5693, s32 *value)
{
	u32 exposure;
	int ret;

	ret = ov5693_read_reg(ov5693, OV5693_EXPOSURE_CTRL_REG, &exposure);
	if (ret)
		return ret;

	/* The lowest 4 bits are unsupported fractional bits */
	*value = exposure >> 4;

	return 0;
}

static int ov5693_exposure_configure(struct ov5693_device *ov5693,
				     u32 exposure)
{
	int ret = 0;

	exposure = (exposure << 4) & OV5693_EXPOSURE_CTRL_MASK;

	ov5693_write_reg(ov5693, OV5693_EXPOSURE_CTRL_REG, exposure, &ret);

	return ret;
}

static int ov5693_get_gain(struct ov5693_device *ov5693, u32 *gain)
{
	u32 value;
	int ret;

	ret = ov5693_read_reg(ov5693, OV5693_GAIN_CTRL_REG, &value);
	if (ret)
		return ret;

	/* As with exposure, the lowest 4 bits are fractional bits. */
	*gain = value >> 4;

	return ret;
}

static int ov5693_digital_gain_configure(struct ov5693_device *ov5693,
					 u32 gain)
{
	int ret = 0;

	gain &= OV5693_MWB_GAIN_MASK;

	ov5693_write_reg(ov5693, OV5693_MWB_RED_GAIN_REG, gain, &ret);
	ov5693_write_reg(ov5693, OV5693_MWB_GREEN_GAIN_REG, gain, &ret);
	ov5693_write_reg(ov5693, OV5693_MWB_BLUE_GAIN_REG, gain, &ret);

	return ret;
}

static int ov5693_analog_gain_configure(struct ov5693_device *ov5693, u32 gain)
{
	int ret = 0;

	gain = (gain << 4) & OV5693_GAIN_CTRL_MASK;

	ov5693_write_reg(ov5693, OV5693_GAIN_CTRL_REG, gain, &ret);

	return ret;
}

static int ov5693_vts_configure(struct ov5693_device *ov5693, u32 vblank)
{
	u16 vts = ov5693->mode.format.height + vblank;
	int ret = 0;

	ov5693_write_reg(ov5693, OV5693_TIMING_VTS_REG, vts, &ret);

	return ret;
}

static int ov5693_test_pattern_configure(struct ov5693_device *ov5693, u32 idx)
{
	int ret = 0;

	ov5693_write_reg(ov5693, OV5693_TEST_PATTERN_REG,
			 ov5693_test_pattern_bits[idx], &ret);

	return ret;
}

static int ov5693_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct ov5693_device *ov5693 =
	    container_of(ctrl->handler, struct ov5693_device, ctrls.handler);
	int ret = 0;

	/* If VBLANK is altered we need to update exposure to compensate */
	if (ctrl->id == V4L2_CID_VBLANK) {
		int exposure_max;

		exposure_max = ov5693->mode.format.height + ctrl->val -
			       OV5693_INTEGRATION_TIME_MARGIN;
		__v4l2_ctrl_modify_range(ov5693->ctrls.exposure,
					 ov5693->ctrls.exposure->minimum,
					 exposure_max,
					 ov5693->ctrls.exposure->step,
					 min(ov5693->ctrls.exposure->val,
					     exposure_max));
	}

	/* Only apply changes to the controls if the device is powered up */
	if (!pm_runtime_get_if_in_use(ov5693->dev))
		return 0;

	switch (ctrl->id) {
	case V4L2_CID_EXPOSURE:
		ret = ov5693_exposure_configure(ov5693, ctrl->val);
		break;
	case V4L2_CID_ANALOGUE_GAIN:
		ret = ov5693_analog_gain_configure(ov5693, ctrl->val);
		break;
	case V4L2_CID_DIGITAL_GAIN:
		ret = ov5693_digital_gain_configure(ov5693, ctrl->val);
		break;
	case V4L2_CID_HFLIP:
		ret = ov5693_flip_horz_configure(ov5693, !!ctrl->val);
		break;
	case V4L2_CID_VFLIP:
		ret = ov5693_flip_vert_configure(ov5693, !!ctrl->val);
		break;
	case V4L2_CID_VBLANK:
		ret = ov5693_vts_configure(ov5693, ctrl->val);
		break;
	case V4L2_CID_TEST_PATTERN:
		ret = ov5693_test_pattern_configure(ov5693, ctrl->val);
		break;
	default:
		ret = -EINVAL;
	}

	pm_runtime_put(ov5693->dev);

	return ret;
}

static int ov5693_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
{
	struct ov5693_device *ov5693 = container_of(ctrl->handler,
						    struct ov5693_device,
						    ctrls.handler);

	switch (ctrl->id) {
	case V4L2_CID_EXPOSURE_ABSOLUTE:
		return ov5693_get_exposure(ov5693, &ctrl->val);
	case V4L2_CID_AUTOGAIN:
		return ov5693_get_gain(ov5693, &ctrl->val);
	default:
		return -EINVAL;
	}
}

static const struct v4l2_ctrl_ops ov5693_ctrl_ops = {
	.s_ctrl = ov5693_s_ctrl,
	.g_volatile_ctrl = ov5693_g_volatile_ctrl
};

/* System Control Functions */

static int ov5693_mode_configure(struct ov5693_device *ov5693)
{
	const struct ov5693_mode *mode = &ov5693->mode;
	int ret = 0;

	/* Crop Start X */
	ov5693_write_reg(ov5693, OV5693_CROP_START_X_REG, mode->crop.left,
			 &ret);

	/* Offset X */
	ov5693_write_reg(ov5693, OV5693_OFFSET_START_X_REG, 0, &ret);

	/* Output Size X */
	ov5693_write_reg(ov5693, OV5693_OUTPUT_SIZE_X_REG, mode->format.width,
			 &ret);

	/* Crop End X */
	ov5693_write_reg(ov5693, OV5693_CROP_END_X_REG,
			 mode->crop.left + mode->crop.width, &ret);

	/* Horizontal Total Size */
	ov5693_write_reg(ov5693, OV5693_TIMING_HTS_REG, OV5693_FIXED_PPL,
			 &ret);

	/* Crop Start Y */
	ov5693_write_reg(ov5693, OV5693_CROP_START_Y_REG, mode->crop.top,
			 &ret);

	/* Offset Y */
	ov5693_write_reg(ov5693, OV5693_OFFSET_START_Y_REG, 0, &ret);

	/* Output Size Y */
	ov5693_write_reg(ov5693, OV5693_OUTPUT_SIZE_Y_REG, mode->format.height,
			 &ret);

	/* Crop End Y */
	ov5693_write_reg(ov5693, OV5693_CROP_END_Y_REG,
			 mode->crop.top + mode->crop.height, &ret);

	/* Subsample X increase */
	ov5693_write_reg(ov5693, OV5693_SUB_INC_X_REG,
			 ((mode->inc_x_odd << 4) & 0xf0) | 0x01, &ret);
	/* Subsample Y increase */
	ov5693_write_reg(ov5693, OV5693_SUB_INC_Y_REG,
			 ((mode->inc_y_odd << 4) & 0xf0) | 0x01, &ret);

	if (ret)
		return ret;

	/* Binning */
	ret = ov5693_update_bits(ov5693, OV5693_FORMAT1_REG,
				 OV5693_FORMAT1_VBIN_EN,
				 mode->binning_y ? OV5693_FORMAT1_VBIN_EN : 0);
	if (ret)
		return ret;

	ret = ov5693_update_bits(ov5693, OV5693_FORMAT2_REG,
				 OV5693_FORMAT2_HBIN_EN,
				 mode->binning_x ? OV5693_FORMAT2_HBIN_EN : 0);

	return ret;
}

static int ov5693_enable_streaming(struct ov5693_device *ov5693, bool enable)
{
	int ret = 0;

	ov5693_write_reg(ov5693, OV5693_SW_STREAM_REG,
			 enable ? OV5693_START_STREAMING :
				  OV5693_STOP_STREAMING, &ret);

	return ret;
}

static int ov5693_sw_reset(struct ov5693_device *ov5693)
{
	int ret = 0;

	ov5693_write_reg(ov5693, OV5693_SW_RESET_REG, OV5693_SW_RESET, &ret);

	return ret;
}

static int ov5693_sensor_init(struct ov5693_device *ov5693)
{
	int ret;

	ret = ov5693_sw_reset(ov5693);
	if (ret)
		return dev_err_probe(ov5693->dev, ret,
				     "software reset error\n");

	ret = ov5693_write_reg_array(ov5693, &ov5693_global_setting);
	if (ret)
		return dev_err_probe(ov5693->dev, ret,
				     "global settings error\n");

	ret = ov5693_mode_configure(ov5693);
	if (ret)
		return dev_err_probe(ov5693->dev, ret,
				     "mode configure error\n");

	ret = ov5693_enable_streaming(ov5693, false);
	if (ret)
		dev_err(ov5693->dev, "stop streaming error\n");

	return ret;
}

static void ov5693_sensor_powerdown(struct ov5693_device *ov5693)
{
	gpiod_set_value_cansleep(ov5693->reset, 1);
	gpiod_set_value_cansleep(ov5693->powerdown, 1);

	regulator_bulk_disable(OV5693_NUM_SUPPLIES, ov5693->supplies);

	clk_disable_unprepare(ov5693->clk);
}

static int ov5693_sensor_powerup(struct ov5693_device *ov5693)
{
	int ret;

	gpiod_set_value_cansleep(ov5693->reset, 1);
	gpiod_set_value_cansleep(ov5693->powerdown, 1);

	ret = clk_prepare_enable(ov5693->clk);
	if (ret) {
		dev_err(ov5693->dev, "Failed to enable clk\n");
		goto fail_power;
	}

	ret = regulator_bulk_enable(OV5693_NUM_SUPPLIES, ov5693->supplies);
	if (ret) {
		dev_err(ov5693->dev, "Failed to enable regulators\n");
		goto fail_power;
	}

	gpiod_set_value_cansleep(ov5693->powerdown, 0);
	gpiod_set_value_cansleep(ov5693->reset, 0);

	usleep_range(5000, 7500);

	return 0;

fail_power:
	ov5693_sensor_powerdown(ov5693);
	return ret;
}

static int __maybe_unused ov5693_sensor_suspend(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct ov5693_device *ov5693 = to_ov5693_sensor(sd);

	ov5693_sensor_powerdown(ov5693);

	return 0;
}

static int __maybe_unused ov5693_sensor_resume(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct ov5693_device *ov5693 = to_ov5693_sensor(sd);
	int ret;

	mutex_lock(&ov5693->lock);

	ret = ov5693_sensor_powerup(ov5693);
	if (ret)
		goto out_unlock;

	ret = ov5693_sensor_init(ov5693);
	if (ret) {
		dev_err(dev, "ov5693 sensor init failure\n");
		goto err_power;
	}

	goto out_unlock;

err_power:
	ov5693_sensor_powerdown(ov5693);
out_unlock:
	mutex_unlock(&ov5693->lock);
	return ret;
}

static int ov5693_detect(struct ov5693_device *ov5693)
{
	int ret;
	u32 id;

	ret = ov5693_read_reg(ov5693, OV5693_REG_CHIP_ID, &id);
	if (ret)
		return ret;

	if (id != OV5693_CHIP_ID)
		return dev_err_probe(ov5693->dev, -ENODEV,
				     "sensor ID mismatch. Found 0x%04x\n", id);

	return 0;
}

/* V4L2 Framework callbacks */

static unsigned int __ov5693_calc_vts(u32 height)
{
	/*
	 * We need to set a sensible default VTS for whatever format height we
	 * happen to be given from set_fmt(). This function just targets
	 * an even multiple of 30fps.
	 */

	unsigned int tgt_fps;

	tgt_fps = rounddown(OV5693_PIXEL_RATE / OV5693_FIXED_PPL / height, 30);

	return ALIGN_DOWN(OV5693_PIXEL_RATE / OV5693_FIXED_PPL / tgt_fps, 2);
}

static struct v4l2_mbus_framefmt *
__ov5693_get_pad_format(struct ov5693_device *ov5693,
			struct v4l2_subdev_state *state,
			unsigned int pad, enum v4l2_subdev_format_whence which)
{
	switch (which) {
	case V4L2_SUBDEV_FORMAT_TRY:
		return v4l2_subdev_get_try_format(&ov5693->sd, state, pad);
	case V4L2_SUBDEV_FORMAT_ACTIVE:
		return &ov5693->mode.format;
	default:
		return NULL;
	}
}

static struct v4l2_rect *
__ov5693_get_pad_crop(struct ov5693_device *ov5693,
		      struct v4l2_subdev_state *state,
		      unsigned int pad, enum v4l2_subdev_format_whence which)
{
	switch (which) {
	case V4L2_SUBDEV_FORMAT_TRY:
		return v4l2_subdev_get_try_crop(&ov5693->sd, state, pad);
	case V4L2_SUBDEV_FORMAT_ACTIVE:
		return &ov5693->mode.crop;
	}

	return NULL;
}

static int ov5693_get_fmt(struct v4l2_subdev *sd,
			  struct v4l2_subdev_state *state,
			  struct v4l2_subdev_format *format)
{
	struct ov5693_device *ov5693 = to_ov5693_sensor(sd);

	format->format = ov5693->mode.format;

	return 0;
}

static int ov5693_set_fmt(struct v4l2_subdev *sd,
			  struct v4l2_subdev_state *state,
			  struct v4l2_subdev_format *format)
{
	struct ov5693_device *ov5693 = to_ov5693_sensor(sd);
	const struct v4l2_rect *crop;
	struct v4l2_mbus_framefmt *fmt;
	unsigned int hratio, vratio;
	unsigned int width, height;
	unsigned int hblank;
	int exposure_max;
	int ret = 0;

	crop = __ov5693_get_pad_crop(ov5693, state, format->pad, format->which);

	/*
	 * Align to two to simplify the binning calculations below, and clamp
	 * the requested format at the crop rectangle
	 */
	width = clamp_t(unsigned int, ALIGN(format->format.width, 2),
			OV5693_MIN_CROP_WIDTH, crop->width);
	height = clamp_t(unsigned int, ALIGN(format->format.height, 2),
			 OV5693_MIN_CROP_HEIGHT, crop->height);

	/*
	 * We can only support setting either the dimensions of the crop rect
	 * or those dimensions binned (separately) by a factor of two.
	 */
	hratio = clamp_t(unsigned int,
			 DIV_ROUND_CLOSEST(crop->width, width), 1, 2);
	vratio = clamp_t(unsigned int,
			 DIV_ROUND_CLOSEST(crop->height, height), 1, 2);

	fmt = __ov5693_get_pad_format(ov5693, state, format->pad,
				      format->which);

	fmt->width = crop->width / hratio;
	fmt->height = crop->height / vratio;
	fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;

	format->format = *fmt;

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

	mutex_lock(&ov5693->lock);

	ov5693->mode.binning_x = hratio > 1 ? true : false;
	ov5693->mode.inc_x_odd = hratio > 1 ? 3 : 1;
	ov5693->mode.binning_y = vratio > 1 ? true : false;
	ov5693->mode.inc_y_odd = vratio > 1 ? 3 : 1;

	ov5693->mode.vts = __ov5693_calc_vts(fmt->height);

	__v4l2_ctrl_modify_range(ov5693->ctrls.vblank,
				 OV5693_TIMING_MIN_VTS,
				 OV5693_TIMING_MAX_VTS - fmt->height,
				 1, ov5693->mode.vts - fmt->height);
	__v4l2_ctrl_s_ctrl(ov5693->ctrls.vblank,
			   ov5693->mode.vts - fmt->height);

	hblank = OV5693_FIXED_PPL - fmt->width;
	__v4l2_ctrl_modify_range(ov5693->ctrls.hblank, hblank, hblank, 1,
				 hblank);

	exposure_max = ov5693->mode.vts - OV5693_INTEGRATION_TIME_MARGIN;
	__v4l2_ctrl_modify_range(ov5693->ctrls.exposure,
				 ov5693->ctrls.exposure->minimum, exposure_max,
				 ov5693->ctrls.exposure->step,
				 min(ov5693->ctrls.exposure->val,
				     exposure_max));

	mutex_unlock(&ov5693->lock);
	return ret;
}

static int ov5693_get_selection(struct v4l2_subdev *sd,
				struct v4l2_subdev_state *state,
				struct v4l2_subdev_selection *sel)
{
	struct ov5693_device *ov5693 = to_ov5693_sensor(sd);

	switch (sel->target) {
	case V4L2_SEL_TGT_CROP:
		mutex_lock(&ov5693->lock);
		sel->r = *__ov5693_get_pad_crop(ov5693, state, sel->pad,
						sel->which);
		mutex_unlock(&ov5693->lock);
		break;
	case V4L2_SEL_TGT_NATIVE_SIZE:
		sel->r.top = 0;
		sel->r.left = 0;
		sel->r.width = OV5693_NATIVE_WIDTH;
		sel->r.height = OV5693_NATIVE_HEIGHT;
		break;
	case V4L2_SEL_TGT_CROP_BOUNDS:
	case V4L2_SEL_TGT_CROP_DEFAULT:
		sel->r.top = OV5693_ACTIVE_START_TOP;
		sel->r.left = OV5693_ACTIVE_START_LEFT;
		sel->r.width = OV5693_ACTIVE_WIDTH;
		sel->r.height = OV5693_ACTIVE_HEIGHT;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int ov5693_set_selection(struct v4l2_subdev *sd,
				struct v4l2_subdev_state *state,
				struct v4l2_subdev_selection *sel)
{
	struct ov5693_device *ov5693 = to_ov5693_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(ALIGN(sel->r.left, 2), OV5693_NATIVE_START_LEFT,
			  OV5693_NATIVE_WIDTH);
	rect.top = clamp(ALIGN(sel->r.top, 2), OV5693_NATIVE_START_TOP,
			 OV5693_NATIVE_HEIGHT);
	rect.width = clamp_t(unsigned int, ALIGN(sel->r.width, 2),
			     OV5693_MIN_CROP_WIDTH, OV5693_NATIVE_WIDTH);
	rect.height = clamp_t(unsigned int, ALIGN(sel->r.height, 2),
			      OV5693_MIN_CROP_HEIGHT, OV5693_NATIVE_HEIGHT);

	/* Make sure the crop rectangle isn't outside the bounds of the array */
	rect.width = min_t(unsigned int, rect.width,
			   OV5693_NATIVE_WIDTH - rect.left);
	rect.height = min_t(unsigned int, rect.height,
			    OV5693_NATIVE_HEIGHT - rect.top);

	__crop = __ov5693_get_pad_crop(ov5693, state, sel->pad, sel->which);

	if (rect.width != __crop->width || rect.height != __crop->height) {
		/*
		 * Reset the output image size if the crop rectangle size has
		 * been modified.
		 */
		format = __ov5693_get_pad_format(ov5693, state, sel->pad,
						 sel->which);
		format->width = rect.width;
		format->height = rect.height;
	}

	*__crop = rect;
	sel->r = rect;

	return 0;
}

static int ov5693_s_stream(struct v4l2_subdev *sd, int enable)
{
	struct ov5693_device *ov5693 = to_ov5693_sensor(sd);
	int ret;

	if (enable) {
		ret = pm_runtime_get_sync(ov5693->dev);
		if (ret < 0)
			goto err_power_down;

		mutex_lock(&ov5693->lock);
		ret = __v4l2_ctrl_handler_setup(&ov5693->ctrls.handler);
		if (ret) {
			mutex_unlock(&ov5693->lock);
			goto err_power_down;
		}

		ret = ov5693_enable_streaming(ov5693, true);
		mutex_unlock(&ov5693->lock);
	} else {
		mutex_lock(&ov5693->lock);
		ret = ov5693_enable_streaming(ov5693, false);
		mutex_unlock(&ov5693->lock);
	}
	if (ret)
		goto err_power_down;

	ov5693->streaming = !!enable;

	if (!enable)
		pm_runtime_put(ov5693->dev);

	return 0;
err_power_down:
	pm_runtime_put_noidle(ov5693->dev);
	return ret;
}

static int ov5693_g_frame_interval(struct v4l2_subdev *sd,
				   struct v4l2_subdev_frame_interval *interval)
{
	struct ov5693_device *ov5693 = to_ov5693_sensor(sd);
	unsigned int framesize = OV5693_FIXED_PPL * (ov5693->mode.format.height +
				 ov5693->ctrls.vblank->val);
	unsigned int fps = DIV_ROUND_CLOSEST(OV5693_PIXEL_RATE, framesize);

	interval->interval.numerator = 1;
	interval->interval.denominator = fps;

	return 0;
}

static int ov5693_enum_mbus_code(struct v4l2_subdev *sd,
				 struct v4l2_subdev_state *state,
				 struct v4l2_subdev_mbus_code_enum *code)
{
	/* Only a single mbus format is supported */
	if (code->index > 0)
		return -EINVAL;

	code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
	return 0;
}

static int ov5693_enum_frame_size(struct v4l2_subdev *sd,
				  struct v4l2_subdev_state *state,
				  struct v4l2_subdev_frame_size_enum *fse)
{
	struct ov5693_device *ov5693 = to_ov5693_sensor(sd);
	struct v4l2_rect *__crop;

	if (fse->index > 1 || fse->code != MEDIA_BUS_FMT_SBGGR10_1X10)
		return -EINVAL;

	__crop = __ov5693_get_pad_crop(ov5693, state, fse->pad, fse->which);
	if (!__crop)
		return -EINVAL;

	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 const struct v4l2_subdev_video_ops ov5693_video_ops = {
	.s_stream = ov5693_s_stream,
	.g_frame_interval = ov5693_g_frame_interval,
};

static const struct v4l2_subdev_pad_ops ov5693_pad_ops = {
	.enum_mbus_code = ov5693_enum_mbus_code,
	.enum_frame_size = ov5693_enum_frame_size,
	.get_fmt = ov5693_get_fmt,
	.set_fmt = ov5693_set_fmt,
	.get_selection = ov5693_get_selection,
	.set_selection = ov5693_set_selection,
};

static const struct v4l2_subdev_ops ov5693_ops = {
	.video = &ov5693_video_ops,
	.pad = &ov5693_pad_ops,
};

/* Sensor and Driver Configuration Functions */

static int ov5693_init_controls(struct ov5693_device *ov5693)
{
	const struct v4l2_ctrl_ops *ops = &ov5693_ctrl_ops;
	struct ov5693_v4l2_ctrls *ctrls = &ov5693->ctrls;
	struct v4l2_fwnode_device_properties props;
	int vblank_max, vblank_def;
	int exposure_max;
	int hblank;
	int ret;

	ret = v4l2_ctrl_handler_init(&ctrls->handler, 12);
	if (ret)
		return ret;

	/* link freq */
	ctrls->link_freq = v4l2_ctrl_new_int_menu(&ctrls->handler,
						  NULL, V4L2_CID_LINK_FREQ,
						  0, 0, link_freq_menu_items);
	if (ctrls->link_freq)
		ctrls->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	/* pixel rate */
	ctrls->pixel_rate = v4l2_ctrl_new_std(&ctrls->handler, NULL,
					      V4L2_CID_PIXEL_RATE, 0,
					      OV5693_PIXEL_RATE, 1,
					      OV5693_PIXEL_RATE);

	/* Exposure */
	exposure_max = ov5693->mode.vts - OV5693_INTEGRATION_TIME_MARGIN;
	ctrls->exposure = v4l2_ctrl_new_std(&ctrls->handler, ops,
					    V4L2_CID_EXPOSURE,
					    OV5693_EXPOSURE_MIN, exposure_max,
					    OV5693_EXPOSURE_STEP, exposure_max);

	/* Gain */
	ctrls->analogue_gain = v4l2_ctrl_new_std(&ctrls->handler,
						 ops, V4L2_CID_ANALOGUE_GAIN,
						 OV5693_GAIN_MIN,
						 OV5693_GAIN_MAX,
						 OV5693_GAIN_STEP,
						 OV5693_GAIN_DEF);

	ctrls->digital_gain = v4l2_ctrl_new_std(&ctrls->handler, ops,
						V4L2_CID_DIGITAL_GAIN,
						OV5693_DIGITAL_GAIN_MIN,
						OV5693_DIGITAL_GAIN_MAX,
						OV5693_DIGITAL_GAIN_STEP,
						OV5693_DIGITAL_GAIN_DEF);

	/* Flip */
	ctrls->hflip = v4l2_ctrl_new_std(&ctrls->handler, ops,
					 V4L2_CID_HFLIP, 0, 1, 1, 0);

	ctrls->vflip = v4l2_ctrl_new_std(&ctrls->handler, ops,
					 V4L2_CID_VFLIP, 0, 1, 1, 0);

	hblank = OV5693_FIXED_PPL - ov5693->mode.format.width;
	ctrls->hblank = v4l2_ctrl_new_std(&ctrls->handler, ops,
					  V4L2_CID_HBLANK, hblank,
					  hblank, 1, hblank);

	if (ctrls->hblank)
		ctrls->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	vblank_max = OV5693_TIMING_MAX_VTS - ov5693->mode.format.height;
	vblank_def = ov5693->mode.vts - ov5693->mode.format.height;
	ctrls->vblank = v4l2_ctrl_new_std(&ctrls->handler, ops,
					  V4L2_CID_VBLANK,
					  OV5693_TIMING_MIN_VTS,
					  vblank_max, 1, vblank_def);

	ctrls->test_pattern = v4l2_ctrl_new_std_menu_items(
					&ctrls->handler, ops,
					V4L2_CID_TEST_PATTERN,
					ARRAY_SIZE(ov5693_test_pattern_menu) - 1,
					0, 0, ov5693_test_pattern_menu);

	if (ctrls->handler.error) {
		dev_err(ov5693->dev, "Error initialising v4l2 ctrls\n");
		ret = ctrls->handler.error;
		goto err_free_handler;
	}

	/* set properties from fwnode (e.g. rotation, orientation) */
	ret = v4l2_fwnode_device_parse(ov5693->dev, &props);
	if (ret)
		goto err_free_handler;

	ret = v4l2_ctrl_new_fwnode_properties(&ctrls->handler, ops,
					      &props);
	if (ret)
		goto err_free_handler;

	/* Use same lock for controls as for everything else. */
	ctrls->handler.lock = &ov5693->lock;
	ov5693->sd.ctrl_handler = &ctrls->handler;

	return 0;

err_free_handler:
	v4l2_ctrl_handler_free(&ctrls->handler);
	return ret;
}

static int ov5693_configure_gpios(struct ov5693_device *ov5693)
{
	ov5693->reset = devm_gpiod_get_optional(ov5693->dev, "reset",
						GPIOD_OUT_HIGH);
	if (IS_ERR(ov5693->reset)) {
		dev_err(ov5693->dev, "Error fetching reset GPIO\n");
		return PTR_ERR(ov5693->reset);
	}

	ov5693->powerdown = devm_gpiod_get_optional(ov5693->dev, "powerdown",
						    GPIOD_OUT_HIGH);
	if (IS_ERR(ov5693->powerdown)) {
		dev_err(ov5693->dev, "Error fetching powerdown GPIO\n");
		return PTR_ERR(ov5693->powerdown);
	}

	return 0;
}

static int ov5693_get_regulators(struct ov5693_device *ov5693)
{
	unsigned int i;

	for (i = 0; i < OV5693_NUM_SUPPLIES; i++)
		ov5693->supplies[i].supply = ov5693_supply_names[i];

	return devm_regulator_bulk_get(ov5693->dev, OV5693_NUM_SUPPLIES,
				       ov5693->supplies);
}

static int ov5693_check_hwcfg(struct ov5693_device *ov5693)
{
	struct fwnode_handle *fwnode = dev_fwnode(ov5693->dev);
	struct v4l2_fwnode_endpoint bus_cfg = {
		.bus_type = V4L2_MBUS_CSI2_DPHY,
	};
	struct fwnode_handle *endpoint;
	unsigned int i;
	int ret;

	endpoint = fwnode_graph_get_next_endpoint(fwnode, NULL);
	if (!endpoint)
		return -EPROBE_DEFER; /* Could be provided by cio2-bridge */

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

	if (bus_cfg.bus.mipi_csi2.num_data_lanes != 2) {
		dev_err(ov5693->dev, "only a 2-lane CSI2 config is supported");
		ret = -EINVAL;
		goto out_free_bus_cfg;
	}

	if (!bus_cfg.nr_of_link_frequencies) {
		dev_err(ov5693->dev, "no link frequencies defined\n");
		ret = -EINVAL;
		goto out_free_bus_cfg;
	}

	for (i = 0; i < bus_cfg.nr_of_link_frequencies; i++)
		if (bus_cfg.link_frequencies[i] == OV5693_LINK_FREQ_419_2MHZ)
			break;

	if (i == bus_cfg.nr_of_link_frequencies) {
		dev_err(ov5693->dev, "supported link freq %ull not found\n",
			OV5693_LINK_FREQ_419_2MHZ);
		ret = -EINVAL;
		goto out_free_bus_cfg;
	}

out_free_bus_cfg:
	v4l2_fwnode_endpoint_free(&bus_cfg);

	return ret;
}

static int ov5693_probe(struct i2c_client *client)
{
	struct ov5693_device *ov5693;
	u32 clk_rate;
	int ret = 0;

	ov5693 = devm_kzalloc(&client->dev, sizeof(*ov5693), GFP_KERNEL);
	if (!ov5693)
		return -ENOMEM;

	ov5693->client = client;
	ov5693->dev = &client->dev;

	ret = ov5693_check_hwcfg(ov5693);
	if (ret)
		return ret;

	mutex_init(&ov5693->lock);

	v4l2_i2c_subdev_init(&ov5693->sd, client, &ov5693_ops);

	ov5693->clk = devm_clk_get(&client->dev, "xvclk");
	if (IS_ERR(ov5693->clk)) {
		dev_err(&client->dev, "Error getting clock\n");
		return PTR_ERR(ov5693->clk);
	}

	clk_rate = clk_get_rate(ov5693->clk);
	if (clk_rate != OV5693_XVCLK_FREQ)
		dev_warn(&client->dev, "Found clk freq %u, expected %u\n",
			 clk_rate, OV5693_XVCLK_FREQ);

	ret = ov5693_configure_gpios(ov5693);
	if (ret)
		return ret;

	ret = ov5693_get_regulators(ov5693);
	if (ret)
		return dev_err_probe(&client->dev, ret,
				     "Error fetching regulators\n");

	ov5693->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	ov5693->pad.flags = MEDIA_PAD_FL_SOURCE;
	ov5693->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;

	ov5693->mode.crop = ov5693_default_crop;
	ov5693->mode.format = ov5693_default_fmt;
	ov5693->mode.vts = __ov5693_calc_vts(ov5693->mode.format.height);

	ret = ov5693_init_controls(ov5693);
	if (ret)
		return ret;

	ret = media_entity_pads_init(&ov5693->sd.entity, 1, &ov5693->pad);
	if (ret)
		goto err_ctrl_handler_free;

	/*
	 * We need the driver to work in the event that pm runtime is disable in
	 * the kernel, so power up and verify the chip now. In the event that
	 * runtime pm is disabled this will leave the chip on, so that streaming
	 * will work.
	 */

	ret = ov5693_sensor_powerup(ov5693);
	if (ret)
		goto err_media_entity_cleanup;

	ret = ov5693_detect(ov5693);
	if (ret)
		goto err_powerdown;

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

	ret = v4l2_async_register_subdev_sensor(&ov5693->sd);
	if (ret) {
		dev_err(&client->dev, "failed to register V4L2 subdev: %d",
			ret);
		goto err_pm_runtime;
	}

	pm_runtime_set_autosuspend_delay(&client->dev, 1000);
	pm_runtime_use_autosuspend(&client->dev);
	pm_runtime_put_autosuspend(&client->dev);

	return ret;

err_pm_runtime:
	pm_runtime_disable(&client->dev);
	pm_runtime_put_noidle(&client->dev);
err_powerdown:
	ov5693_sensor_powerdown(ov5693);
err_media_entity_cleanup:
	media_entity_cleanup(&ov5693->sd.entity);
err_ctrl_handler_free:
	v4l2_ctrl_handler_free(&ov5693->ctrls.handler);

	return ret;
}

static int ov5693_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov5693_device *ov5693 = to_ov5693_sensor(sd);

	v4l2_async_unregister_subdev(sd);
	media_entity_cleanup(&ov5693->sd.entity);
	v4l2_ctrl_handler_free(&ov5693->ctrls.handler);
	mutex_destroy(&ov5693->lock);

	/*
	 * 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))
		ov5693_sensor_powerdown(ov5693);
	pm_runtime_set_suspended(&client->dev);

	return 0;
}

static const struct dev_pm_ops ov5693_pm_ops = {
	SET_RUNTIME_PM_OPS(ov5693_sensor_suspend, ov5693_sensor_resume, NULL)
};

static const struct acpi_device_id ov5693_acpi_match[] = {
	{"INT33BE"},
	{},
};
MODULE_DEVICE_TABLE(acpi, ov5693_acpi_match);

static struct i2c_driver ov5693_driver = {
	.driver = {
		.name = "ov5693",
		.acpi_match_table = ov5693_acpi_match,
		.pm = &ov5693_pm_ops,
	},
	.probe_new = ov5693_probe,
	.remove = ov5693_remove,
};
module_i2c_driver(ov5693_driver);

MODULE_DESCRIPTION("A low-level driver for OmniVision 5693 sensors");
MODULE_LICENSE("GPL");