// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2021 Intel Corporation.

#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>

#define OV13B10_REG_VALUE_08BIT		1
#define OV13B10_REG_VALUE_16BIT		2
#define OV13B10_REG_VALUE_24BIT		3

#define OV13B10_REG_MODE_SELECT		0x0100
#define OV13B10_MODE_STANDBY		0x00
#define OV13B10_MODE_STREAMING		0x01

#define OV13B10_REG_SOFTWARE_RST	0x0103
#define OV13B10_SOFTWARE_RST		0x01

/* Chip ID */
#define OV13B10_REG_CHIP_ID		0x300a
#define OV13B10_CHIP_ID			0x560d42

/* V_TIMING internal */
#define OV13B10_REG_VTS			0x380e
#define OV13B10_VTS_30FPS		0x0c7c
#define OV13B10_VTS_60FPS		0x063e
#define OV13B10_VTS_120FPS		0x0320
#define OV13B10_VTS_MAX			0x7fff

/* HBLANK control - read only */
#define OV13B10_PPL_560MHZ		4704

/* Exposure control */
#define OV13B10_REG_EXPOSURE		0x3500
#define OV13B10_EXPOSURE_MIN		4
#define OV13B10_EXPOSURE_STEP		1
#define OV13B10_EXPOSURE_DEFAULT	0x40

/* Analog gain control */
#define OV13B10_REG_ANALOG_GAIN		0x3508
#define OV13B10_ANA_GAIN_MIN		0x80
#define OV13B10_ANA_GAIN_MAX		0x07c0
#define OV13B10_ANA_GAIN_STEP		1
#define OV13B10_ANA_GAIN_DEFAULT	0x80

/* Digital gain control */
#define OV13B10_REG_DGTL_GAIN_H		0x350a
#define OV13B10_REG_DGTL_GAIN_M		0x350b
#define OV13B10_REG_DGTL_GAIN_L		0x350c

#define OV13B10_DGTL_GAIN_MIN		1024	     /* Min = 1 X */
#define OV13B10_DGTL_GAIN_MAX		(4096 - 1)   /* Max = 4 X */
#define OV13B10_DGTL_GAIN_DEFAULT	2560	     /* Default gain = 2.5 X */
#define OV13B10_DGTL_GAIN_STEP		1	     /* Each step = 1/1024 */

#define OV13B10_DGTL_GAIN_L_SHIFT	6
#define OV13B10_DGTL_GAIN_L_MASK	0x3
#define OV13B10_DGTL_GAIN_M_SHIFT	2
#define OV13B10_DGTL_GAIN_M_MASK	0xff
#define OV13B10_DGTL_GAIN_H_SHIFT	10
#define OV13B10_DGTL_GAIN_H_MASK	0x3

/* Test Pattern Control */
#define OV13B10_REG_TEST_PATTERN	0x5080
#define OV13B10_TEST_PATTERN_ENABLE	BIT(7)
#define OV13B10_TEST_PATTERN_MASK	0xf3
#define OV13B10_TEST_PATTERN_BAR_SHIFT	2

/* Flip Control */
#define OV13B10_REG_FORMAT1		0x3820
#define OV13B10_REG_FORMAT2		0x3821

/* Horizontal Window Offset */
#define OV13B10_REG_H_WIN_OFFSET	0x3811

/* Vertical Window Offset */
#define OV13B10_REG_V_WIN_OFFSET	0x3813

struct ov13b10_reg {
	u16 address;
	u8 val;
};

struct ov13b10_reg_list {
	u32 num_of_regs;
	const struct ov13b10_reg *regs;
};

/* Link frequency config */
struct ov13b10_link_freq_config {
	u32 pixels_per_line;

	/* registers for this link frequency */
	struct ov13b10_reg_list reg_list;
};

/* Mode : resolution and related config&values */
struct ov13b10_mode {
	/* Frame width */
	u32 width;
	/* Frame height */
	u32 height;

	/* V-timing */
	u32 vts_def;
	u32 vts_min;

	/* Index of Link frequency config to be used */
	u32 link_freq_index;
	/* Default register values */
	struct ov13b10_reg_list reg_list;
};

/* 4208x3120 needs 1120Mbps/lane, 4 lanes */
static const struct ov13b10_reg mipi_data_rate_1120mbps[] = {
	{0x0103, 0x01},
	{0x0303, 0x04},
	{0x0305, 0xaf},
	{0x0321, 0x00},
	{0x0323, 0x04},
	{0x0324, 0x01},
	{0x0325, 0xa4},
	{0x0326, 0x81},
	{0x0327, 0x04},
	{0x3012, 0x07},
	{0x3013, 0x32},
	{0x3107, 0x23},
	{0x3501, 0x0c},
	{0x3502, 0x10},
	{0x3504, 0x08},
	{0x3508, 0x07},
	{0x3509, 0xc0},
	{0x3600, 0x16},
	{0x3601, 0x54},
	{0x3612, 0x4e},
	{0x3620, 0x00},
	{0x3621, 0x68},
	{0x3622, 0x66},
	{0x3623, 0x03},
	{0x3662, 0x92},
	{0x3666, 0xbb},
	{0x3667, 0x44},
	{0x366e, 0xff},
	{0x366f, 0xf3},
	{0x3675, 0x44},
	{0x3676, 0x00},
	{0x367f, 0xe9},
	{0x3681, 0x32},
	{0x3682, 0x1f},
	{0x3683, 0x0b},
	{0x3684, 0x0b},
	{0x3704, 0x0f},
	{0x3706, 0x40},
	{0x3708, 0x3b},
	{0x3709, 0x72},
	{0x370b, 0xa2},
	{0x3714, 0x24},
	{0x371a, 0x3e},
	{0x3725, 0x42},
	{0x3739, 0x12},
	{0x3767, 0x00},
	{0x377a, 0x0d},
	{0x3789, 0x18},
	{0x3790, 0x40},
	{0x3791, 0xa2},
	{0x37c2, 0x04},
	{0x37c3, 0xf1},
	{0x37d9, 0x0c},
	{0x37da, 0x02},
	{0x37dc, 0x02},
	{0x37e1, 0x04},
	{0x37e2, 0x0a},
	{0x3800, 0x00},
	{0x3801, 0x00},
	{0x3802, 0x00},
	{0x3803, 0x08},
	{0x3804, 0x10},
	{0x3805, 0x8f},
	{0x3806, 0x0c},
	{0x3807, 0x47},
	{0x3808, 0x10},
	{0x3809, 0x70},
	{0x380a, 0x0c},
	{0x380b, 0x30},
	{0x380c, 0x04},
	{0x380d, 0x98},
	{0x380e, 0x0c},
	{0x380f, 0x7c},
	{0x3811, 0x0f},
	{0x3813, 0x09},
	{0x3814, 0x01},
	{0x3815, 0x01},
	{0x3816, 0x01},
	{0x3817, 0x01},
	{0x381f, 0x08},
	{0x3820, 0x88},
	{0x3821, 0x00},
	{0x3822, 0x14},
	{0x382e, 0xe6},
	{0x3c80, 0x00},
	{0x3c87, 0x01},
	{0x3c8c, 0x19},
	{0x3c8d, 0x1c},
	{0x3ca0, 0x00},
	{0x3ca1, 0x00},
	{0x3ca2, 0x00},
	{0x3ca3, 0x00},
	{0x3ca4, 0x50},
	{0x3ca5, 0x11},
	{0x3ca6, 0x01},
	{0x3ca7, 0x00},
	{0x3ca8, 0x00},
	{0x4008, 0x02},
	{0x4009, 0x0f},
	{0x400a, 0x01},
	{0x400b, 0x19},
	{0x4011, 0x21},
	{0x4017, 0x08},
	{0x4019, 0x04},
	{0x401a, 0x58},
	{0x4032, 0x1e},
	{0x4050, 0x02},
	{0x4051, 0x09},
	{0x405e, 0x00},
	{0x4066, 0x02},
	{0x4501, 0x00},
	{0x4502, 0x10},
	{0x4505, 0x00},
	{0x4800, 0x64},
	{0x481b, 0x3e},
	{0x481f, 0x30},
	{0x4825, 0x34},
	{0x4837, 0x0e},
	{0x484b, 0x01},
	{0x4883, 0x02},
	{0x5000, 0xff},
	{0x5001, 0x0f},
	{0x5045, 0x20},
	{0x5046, 0x20},
	{0x5047, 0xa4},
	{0x5048, 0x20},
	{0x5049, 0xa4},
};

static const struct ov13b10_reg mode_4208x3120_regs[] = {
	{0x0305, 0xaf},
	{0x3501, 0x0c},
	{0x3662, 0x92},
	{0x3714, 0x24},
	{0x3739, 0x12},
	{0x37c2, 0x04},
	{0x37d9, 0x0c},
	{0x37e2, 0x0a},
	{0x3800, 0x00},
	{0x3801, 0x00},
	{0x3802, 0x00},
	{0x3803, 0x08},
	{0x3804, 0x10},
	{0x3805, 0x8f},
	{0x3806, 0x0c},
	{0x3807, 0x47},
	{0x3808, 0x10},
	{0x3809, 0x70},
	{0x380a, 0x0c},
	{0x380b, 0x30},
	{0x380c, 0x04},
	{0x380d, 0x98},
	{0x380e, 0x0c},
	{0x380f, 0x7c},
	{0x3810, 0x00},
	{0x3811, 0x0f},
	{0x3812, 0x00},
	{0x3813, 0x09},
	{0x3814, 0x01},
	{0x3816, 0x01},
	{0x3820, 0x88},
	{0x3c8c, 0x19},
	{0x4008, 0x02},
	{0x4009, 0x0f},
	{0x4050, 0x02},
	{0x4051, 0x09},
	{0x4501, 0x00},
	{0x4505, 0x00},
	{0x4837, 0x0e},
	{0x5000, 0xff},
	{0x5001, 0x0f},
};

static const struct ov13b10_reg mode_4160x3120_regs[] = {
	{0x0305, 0xaf},
	{0x3501, 0x0c},
	{0x3662, 0x92},
	{0x3714, 0x24},
	{0x3739, 0x12},
	{0x37c2, 0x04},
	{0x37d9, 0x0c},
	{0x37e2, 0x0a},
	{0x3800, 0x00},
	{0x3801, 0x00},
	{0x3802, 0x00},
	{0x3803, 0x08},
	{0x3804, 0x10},
	{0x3805, 0x8f},
	{0x3806, 0x0c},
	{0x3807, 0x47},
	{0x3808, 0x10},
	{0x3809, 0x40},
	{0x380a, 0x0c},
	{0x380b, 0x30},
	{0x380c, 0x04},
	{0x380d, 0x98},
	{0x380e, 0x0c},
	{0x380f, 0x7c},
	{0x3810, 0x00},
	{0x3811, 0x27},
	{0x3812, 0x00},
	{0x3813, 0x09},
	{0x3814, 0x01},
	{0x3816, 0x01},
	{0x3820, 0x88},
	{0x3c8c, 0x19},
	{0x4008, 0x02},
	{0x4009, 0x0f},
	{0x4050, 0x02},
	{0x4051, 0x09},
	{0x4501, 0x00},
	{0x4505, 0x00},
	{0x4837, 0x0e},
	{0x5000, 0xff},
	{0x5001, 0x0f},
};

static const struct ov13b10_reg mode_4160x2340_regs[] = {
	{0x0305, 0xaf},
	{0x3501, 0x0c},
	{0x3662, 0x92},
	{0x3714, 0x24},
	{0x3739, 0x12},
	{0x37c2, 0x04},
	{0x37d9, 0x0c},
	{0x37e2, 0x0a},
	{0x3800, 0x00},
	{0x3801, 0x00},
	{0x3802, 0x00},
	{0x3803, 0x08},
	{0x3804, 0x10},
	{0x3805, 0x8f},
	{0x3806, 0x0c},
	{0x3807, 0x47},
	{0x3808, 0x10},
	{0x3809, 0x40},
	{0x380a, 0x09},
	{0x380b, 0x24},
	{0x380c, 0x04},
	{0x380d, 0x98},
	{0x380e, 0x0c},
	{0x380f, 0x7c},
	{0x3810, 0x00},
	{0x3811, 0x27},
	{0x3812, 0x01},
	{0x3813, 0x8f},
	{0x3814, 0x01},
	{0x3816, 0x01},
	{0x3820, 0x88},
	{0x3c8c, 0x19},
	{0x4008, 0x02},
	{0x4009, 0x0f},
	{0x4050, 0x02},
	{0x4051, 0x09},
	{0x4501, 0x00},
	{0x4505, 0x00},
	{0x4837, 0x0e},
	{0x5000, 0xff},
	{0x5001, 0x0f},
};

static const struct ov13b10_reg mode_2104x1560_regs[] = {
	{0x0305, 0xaf},
	{0x3501, 0x06},
	{0x3662, 0x88},
	{0x3714, 0x28},
	{0x3739, 0x10},
	{0x37c2, 0x14},
	{0x37d9, 0x06},
	{0x37e2, 0x0c},
	{0x3800, 0x00},
	{0x3801, 0x00},
	{0x3802, 0x00},
	{0x3803, 0x08},
	{0x3804, 0x10},
	{0x3805, 0x8f},
	{0x3806, 0x0c},
	{0x3807, 0x47},
	{0x3808, 0x08},
	{0x3809, 0x38},
	{0x380a, 0x06},
	{0x380b, 0x18},
	{0x380c, 0x04},
	{0x380d, 0x98},
	{0x380e, 0x06},
	{0x380f, 0x3e},
	{0x3810, 0x00},
	{0x3811, 0x07},
	{0x3812, 0x00},
	{0x3813, 0x05},
	{0x3814, 0x03},
	{0x3816, 0x03},
	{0x3820, 0x8b},
	{0x3c8c, 0x18},
	{0x4008, 0x00},
	{0x4009, 0x05},
	{0x4050, 0x00},
	{0x4051, 0x05},
	{0x4501, 0x08},
	{0x4505, 0x00},
	{0x4837, 0x0e},
	{0x5000, 0xfd},
	{0x5001, 0x0d},
};

static const struct ov13b10_reg mode_2080x1170_regs[] = {
	{0x0305, 0xaf},
	{0x3501, 0x06},
	{0x3662, 0x88},
	{0x3714, 0x28},
	{0x3739, 0x10},
	{0x37c2, 0x14},
	{0x37d9, 0x06},
	{0x37e2, 0x0c},
	{0x3800, 0x00},
	{0x3801, 0x00},
	{0x3802, 0x00},
	{0x3803, 0x08},
	{0x3804, 0x10},
	{0x3805, 0x8f},
	{0x3806, 0x0c},
	{0x3807, 0x47},
	{0x3808, 0x08},
	{0x3809, 0x20},
	{0x380a, 0x04},
	{0x380b, 0x92},
	{0x380c, 0x04},
	{0x380d, 0x98},
	{0x380e, 0x06},
	{0x380f, 0x3e},
	{0x3810, 0x00},
	{0x3811, 0x13},
	{0x3812, 0x00},
	{0x3813, 0xc9},
	{0x3814, 0x03},
	{0x3816, 0x03},
	{0x3820, 0x8b},
	{0x3c8c, 0x18},
	{0x4008, 0x00},
	{0x4009, 0x05},
	{0x4050, 0x00},
	{0x4051, 0x05},
	{0x4501, 0x08},
	{0x4505, 0x00},
	{0x4837, 0x0e},
	{0x5000, 0xfd},
	{0x5001, 0x0d},
};

static const struct ov13b10_reg mode_1364x768_120fps_regs[] = {
	{0x0305, 0xaf},
	{0x3011, 0x7c},
	{0x3501, 0x03},
	{0x3502, 0x00},
	{0x3662, 0x88},
	{0x3714, 0x28},
	{0x3739, 0x10},
	{0x37c2, 0x14},
	{0x37d9, 0x06},
	{0x37e2, 0x0c},
	{0x37e4, 0x00},
	{0x3800, 0x02},
	{0x3801, 0xe4},
	{0x3802, 0x03},
	{0x3803, 0x48},
	{0x3804, 0x0d},
	{0x3805, 0xab},
	{0x3806, 0x09},
	{0x3807, 0x60},
	{0x3808, 0x05},
	{0x3809, 0x54},
	{0x380a, 0x03},
	{0x380b, 0x00},
	{0x380c, 0x04},
	{0x380d, 0x8e},
	{0x380e, 0x03},
	{0x380f, 0x20},
	{0x3811, 0x07},
	{0x3813, 0x07},
	{0x3814, 0x03},
	{0x3816, 0x03},
	{0x3820, 0x8b},
	{0x3c8c, 0x18},
	{0x4008, 0x00},
	{0x4009, 0x05},
	{0x4050, 0x00},
	{0x4051, 0x05},
	{0x4501, 0x08},
	{0x4505, 0x04},
	{0x5000, 0xfd},
	{0x5001, 0x0d},
};

static const char * const ov13b10_test_pattern_menu[] = {
	"Disabled",
	"Vertical Color Bar Type 1",
	"Vertical Color Bar Type 2",
	"Vertical Color Bar Type 3",
	"Vertical Color Bar Type 4"
};

/* Configurations for supported link frequencies */
#define OV13B10_LINK_FREQ_560MHZ	560000000ULL
#define OV13B10_LINK_FREQ_INDEX_0	0

#define OV13B10_EXT_CLK			19200000
#define OV13B10_DATA_LANES		4

/*
 * pixel_rate = link_freq * data-rate * nr_of_lanes / bits_per_sample
 * data rate => double data rate; number of lanes => 4; bits per pixel => 10
 */
static u64 link_freq_to_pixel_rate(u64 f)
{
	f *= 2 * OV13B10_DATA_LANES;
	do_div(f, 10);

	return f;
}

/* Menu items for LINK_FREQ V4L2 control */
static const s64 link_freq_menu_items[] = {
	OV13B10_LINK_FREQ_560MHZ
};

/* Link frequency configs */
static const struct ov13b10_link_freq_config
			link_freq_configs[] = {
	{
		.pixels_per_line = OV13B10_PPL_560MHZ,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mipi_data_rate_1120mbps),
			.regs = mipi_data_rate_1120mbps,
		}
	}
};

/* Mode configs */
static const struct ov13b10_mode supported_modes[] = {
	{
		.width = 4208,
		.height = 3120,
		.vts_def = OV13B10_VTS_30FPS,
		.vts_min = OV13B10_VTS_30FPS,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mode_4208x3120_regs),
			.regs = mode_4208x3120_regs,
		},
		.link_freq_index = OV13B10_LINK_FREQ_INDEX_0,
	},
	{
		.width = 4160,
		.height = 3120,
		.vts_def = OV13B10_VTS_30FPS,
		.vts_min = OV13B10_VTS_30FPS,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mode_4160x3120_regs),
			.regs = mode_4160x3120_regs,
		},
		.link_freq_index = OV13B10_LINK_FREQ_INDEX_0,
	},
	{
		.width = 4160,
		.height = 2340,
		.vts_def = OV13B10_VTS_30FPS,
		.vts_min = OV13B10_VTS_30FPS,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mode_4160x2340_regs),
			.regs = mode_4160x2340_regs,
		},
		.link_freq_index = OV13B10_LINK_FREQ_INDEX_0,
	},
	{
		.width = 2104,
		.height = 1560,
		.vts_def = OV13B10_VTS_60FPS,
		.vts_min = OV13B10_VTS_60FPS,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mode_2104x1560_regs),
			.regs = mode_2104x1560_regs,
		},
		.link_freq_index = OV13B10_LINK_FREQ_INDEX_0,
	},
	{
		.width = 2080,
		.height = 1170,
		.vts_def = OV13B10_VTS_60FPS,
		.vts_min = OV13B10_VTS_60FPS,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mode_2080x1170_regs),
			.regs = mode_2080x1170_regs,
		},
		.link_freq_index = OV13B10_LINK_FREQ_INDEX_0,
	},
	{
		.width = 1364,
		.height = 768,
		.vts_def = OV13B10_VTS_120FPS,
		.vts_min = OV13B10_VTS_120FPS,
		.link_freq_index = OV13B10_LINK_FREQ_INDEX_0,
		.reg_list = {
			.num_of_regs = ARRAY_SIZE(mode_1364x768_120fps_regs),
			.regs = mode_1364x768_120fps_regs,
		},
	},
};

struct ov13b10 {
	struct v4l2_subdev sd;
	struct media_pad pad;

	struct v4l2_ctrl_handler ctrl_handler;

	struct clk *img_clk;
	struct regulator *avdd;
	struct gpio_desc *reset;

	/* V4L2 Controls */
	struct v4l2_ctrl *link_freq;
	struct v4l2_ctrl *pixel_rate;
	struct v4l2_ctrl *vblank;
	struct v4l2_ctrl *hblank;
	struct v4l2_ctrl *exposure;

	/* Current mode */
	const struct ov13b10_mode *cur_mode;

	/* Mutex for serialized access */
	struct mutex mutex;

	/* True if the device has been identified */
	bool identified;
};

#define to_ov13b10(_sd)	container_of(_sd, struct ov13b10, sd)

/* Read registers up to 4 at a time */
static int ov13b10_read_reg(struct ov13b10 *ov13b,
			    u16 reg, u32 len, u32 *val)
{
	struct i2c_client *client = v4l2_get_subdevdata(&ov13b->sd);
	struct i2c_msg msgs[2];
	u8 *data_be_p;
	int ret;
	__be32 data_be = 0;
	__be16 reg_addr_be = cpu_to_be16(reg);

	if (len > 4)
		return -EINVAL;

	data_be_p = (u8 *)&data_be;
	/* Write register address */
	msgs[0].addr = client->addr;
	msgs[0].flags = 0;
	msgs[0].len = 2;
	msgs[0].buf = (u8 *)&reg_addr_be;

	/* Read data from register */
	msgs[1].addr = client->addr;
	msgs[1].flags = I2C_M_RD;
	msgs[1].len = len;
	msgs[1].buf = &data_be_p[4 - len];

	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
	if (ret != ARRAY_SIZE(msgs))
		return -EIO;

	*val = be32_to_cpu(data_be);

	return 0;
}

/* Write registers up to 4 at a time */
static int ov13b10_write_reg(struct ov13b10 *ov13b,
			     u16 reg, u32 len, u32 __val)
{
	struct i2c_client *client = v4l2_get_subdevdata(&ov13b->sd);
	int buf_i, val_i;
	u8 buf[6], *val_p;
	__be32 val;

	if (len > 4)
		return -EINVAL;

	buf[0] = reg >> 8;
	buf[1] = reg & 0xff;

	val = cpu_to_be32(__val);
	val_p = (u8 *)&val;
	buf_i = 2;
	val_i = 4 - len;

	while (val_i < 4)
		buf[buf_i++] = val_p[val_i++];

	if (i2c_master_send(client, buf, len + 2) != len + 2)
		return -EIO;

	return 0;
}

/* Write a list of registers */
static int ov13b10_write_regs(struct ov13b10 *ov13b,
			      const struct ov13b10_reg *regs, u32 len)
{
	struct i2c_client *client = v4l2_get_subdevdata(&ov13b->sd);
	int ret;
	u32 i;

	for (i = 0; i < len; i++) {
		ret = ov13b10_write_reg(ov13b, regs[i].address, 1,
					regs[i].val);
		if (ret) {
			dev_err_ratelimited(&client->dev,
					    "Failed to write reg 0x%4.4x. error = %d\n",
					    regs[i].address, ret);

			return ret;
		}
	}

	return 0;
}

static int ov13b10_write_reg_list(struct ov13b10 *ov13b,
				  const struct ov13b10_reg_list *r_list)
{
	return ov13b10_write_regs(ov13b, r_list->regs, r_list->num_of_regs);
}

/* Open sub-device */
static int ov13b10_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	const struct ov13b10_mode *default_mode = &supported_modes[0];
	struct ov13b10 *ov13b = to_ov13b10(sd);
	struct v4l2_mbus_framefmt *try_fmt = v4l2_subdev_state_get_format(fh->state,
									  0);

	mutex_lock(&ov13b->mutex);

	/* Initialize try_fmt */
	try_fmt->width = default_mode->width;
	try_fmt->height = default_mode->height;
	try_fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
	try_fmt->field = V4L2_FIELD_NONE;

	/* No crop or compose */
	mutex_unlock(&ov13b->mutex);

	return 0;
}

static int ov13b10_update_digital_gain(struct ov13b10 *ov13b, u32 d_gain)
{
	int ret;
	u32 val;

	/*
	 * 0x350C[7:6], 0x350B[7:0], 0x350A[1:0]
	 */

	val = (d_gain & OV13B10_DGTL_GAIN_L_MASK) << OV13B10_DGTL_GAIN_L_SHIFT;
	ret = ov13b10_write_reg(ov13b, OV13B10_REG_DGTL_GAIN_L,
				OV13B10_REG_VALUE_08BIT, val);
	if (ret)
		return ret;

	val = (d_gain >> OV13B10_DGTL_GAIN_M_SHIFT) & OV13B10_DGTL_GAIN_M_MASK;
	ret = ov13b10_write_reg(ov13b, OV13B10_REG_DGTL_GAIN_M,
				OV13B10_REG_VALUE_08BIT, val);
	if (ret)
		return ret;

	val = (d_gain >> OV13B10_DGTL_GAIN_H_SHIFT) & OV13B10_DGTL_GAIN_H_MASK;
	ret = ov13b10_write_reg(ov13b, OV13B10_REG_DGTL_GAIN_H,
				OV13B10_REG_VALUE_08BIT, val);

	return ret;
}

static int ov13b10_enable_test_pattern(struct ov13b10 *ov13b, u32 pattern)
{
	int ret;
	u32 val;

	ret = ov13b10_read_reg(ov13b, OV13B10_REG_TEST_PATTERN,
			       OV13B10_REG_VALUE_08BIT, &val);
	if (ret)
		return ret;

	if (pattern) {
		val &= OV13B10_TEST_PATTERN_MASK;
		val |= ((pattern - 1) << OV13B10_TEST_PATTERN_BAR_SHIFT) |
		     OV13B10_TEST_PATTERN_ENABLE;
	} else {
		val &= ~OV13B10_TEST_PATTERN_ENABLE;
	}

	return ov13b10_write_reg(ov13b, OV13B10_REG_TEST_PATTERN,
				 OV13B10_REG_VALUE_08BIT, val);
}

static int ov13b10_set_ctrl_hflip(struct ov13b10 *ov13b, u32 ctrl_val)
{
	int ret;
	u32 val;

	ret = ov13b10_read_reg(ov13b, OV13B10_REG_FORMAT1,
			       OV13B10_REG_VALUE_08BIT, &val);
	if (ret)
		return ret;

	ret = ov13b10_write_reg(ov13b, OV13B10_REG_FORMAT1,
				OV13B10_REG_VALUE_08BIT,
				ctrl_val ? val & ~BIT(3) : val);

	if (ret)
		return ret;

	ret = ov13b10_read_reg(ov13b, OV13B10_REG_H_WIN_OFFSET,
			       OV13B10_REG_VALUE_08BIT, &val);
	if (ret)
		return ret;

	/*
	 * Applying cropping offset to reverse the change of Bayer order
	 * after mirroring image
	 */
	return ov13b10_write_reg(ov13b, OV13B10_REG_H_WIN_OFFSET,
				 OV13B10_REG_VALUE_08BIT,
				 ctrl_val ? ++val : val);
}

static int ov13b10_set_ctrl_vflip(struct ov13b10 *ov13b, u32 ctrl_val)
{
	int ret;
	u32 val;

	ret = ov13b10_read_reg(ov13b, OV13B10_REG_FORMAT1,
			       OV13B10_REG_VALUE_08BIT, &val);
	if (ret)
		return ret;

	ret = ov13b10_write_reg(ov13b, OV13B10_REG_FORMAT1,
				OV13B10_REG_VALUE_08BIT,
				ctrl_val ? val | BIT(4) | BIT(5)  : val);

	if (ret)
		return ret;

	ret = ov13b10_read_reg(ov13b, OV13B10_REG_V_WIN_OFFSET,
			       OV13B10_REG_VALUE_08BIT, &val);
	if (ret)
		return ret;

	/*
	 * Applying cropping offset to reverse the change of Bayer order
	 * after flipping image
	 */
	return ov13b10_write_reg(ov13b, OV13B10_REG_V_WIN_OFFSET,
				 OV13B10_REG_VALUE_08BIT,
				 ctrl_val ? --val : val);
}

static int ov13b10_set_ctrl(struct v4l2_ctrl *ctrl)
{
	struct ov13b10 *ov13b = container_of(ctrl->handler,
					     struct ov13b10, ctrl_handler);
	struct i2c_client *client = v4l2_get_subdevdata(&ov13b->sd);
	s64 max;
	int ret;

	/* Propagate change of current control to all related controls */
	switch (ctrl->id) {
	case V4L2_CID_VBLANK:
		/* Update max exposure while meeting expected vblanking */
		max = ov13b->cur_mode->height + ctrl->val - 8;
		__v4l2_ctrl_modify_range(ov13b->exposure,
					 ov13b->exposure->minimum,
					 max, ov13b->exposure->step, max);
		break;
	}

	/*
	 * Applying V4L2 control value only happens
	 * when power is up for streaming
	 */
	if (!pm_runtime_get_if_in_use(&client->dev))
		return 0;

	ret = 0;
	switch (ctrl->id) {
	case V4L2_CID_ANALOGUE_GAIN:
		ret = ov13b10_write_reg(ov13b, OV13B10_REG_ANALOG_GAIN,
					OV13B10_REG_VALUE_16BIT,
					ctrl->val << 1);
		break;
	case V4L2_CID_DIGITAL_GAIN:
		ret = ov13b10_update_digital_gain(ov13b, ctrl->val);
		break;
	case V4L2_CID_EXPOSURE:
		ret = ov13b10_write_reg(ov13b, OV13B10_REG_EXPOSURE,
					OV13B10_REG_VALUE_24BIT,
					ctrl->val);
		break;
	case V4L2_CID_VBLANK:
		ret = ov13b10_write_reg(ov13b, OV13B10_REG_VTS,
					OV13B10_REG_VALUE_16BIT,
					ov13b->cur_mode->height
					+ ctrl->val);
		break;
	case V4L2_CID_TEST_PATTERN:
		ret = ov13b10_enable_test_pattern(ov13b, ctrl->val);
		break;
	case V4L2_CID_HFLIP:
		ov13b10_set_ctrl_hflip(ov13b, ctrl->val);
		break;
	case V4L2_CID_VFLIP:
		ov13b10_set_ctrl_vflip(ov13b, ctrl->val);
		break;
	default:
		dev_info(&client->dev,
			 "ctrl(id:0x%x,val:0x%x) is not handled\n",
			 ctrl->id, ctrl->val);
		break;
	}

	pm_runtime_put(&client->dev);

	return ret;
}

static const struct v4l2_ctrl_ops ov13b10_ctrl_ops = {
	.s_ctrl = ov13b10_set_ctrl,
};

static int ov13b10_enum_mbus_code(struct v4l2_subdev *sd,
				  struct v4l2_subdev_state *sd_state,
				  struct v4l2_subdev_mbus_code_enum *code)
{
	/* Only one bayer order(GRBG) is supported */
	if (code->index > 0)
		return -EINVAL;

	code->code = MEDIA_BUS_FMT_SGRBG10_1X10;

	return 0;
}

static int ov13b10_enum_frame_size(struct v4l2_subdev *sd,
				   struct v4l2_subdev_state *sd_state,
				   struct v4l2_subdev_frame_size_enum *fse)
{
	if (fse->index >= ARRAY_SIZE(supported_modes))
		return -EINVAL;

	if (fse->code != MEDIA_BUS_FMT_SGRBG10_1X10)
		return -EINVAL;

	fse->min_width = supported_modes[fse->index].width;
	fse->max_width = fse->min_width;
	fse->min_height = supported_modes[fse->index].height;
	fse->max_height = fse->min_height;

	return 0;
}

static void ov13b10_update_pad_format(const struct ov13b10_mode *mode,
				      struct v4l2_subdev_format *fmt)
{
	fmt->format.width = mode->width;
	fmt->format.height = mode->height;
	fmt->format.code = MEDIA_BUS_FMT_SGRBG10_1X10;
	fmt->format.field = V4L2_FIELD_NONE;
}

static int ov13b10_do_get_pad_format(struct ov13b10 *ov13b,
				     struct v4l2_subdev_state *sd_state,
				     struct v4l2_subdev_format *fmt)
{
	struct v4l2_mbus_framefmt *framefmt;

	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
		framefmt = v4l2_subdev_state_get_format(sd_state, fmt->pad);
		fmt->format = *framefmt;
	} else {
		ov13b10_update_pad_format(ov13b->cur_mode, fmt);
	}

	return 0;
}

static int ov13b10_get_pad_format(struct v4l2_subdev *sd,
				  struct v4l2_subdev_state *sd_state,
				  struct v4l2_subdev_format *fmt)
{
	struct ov13b10 *ov13b = to_ov13b10(sd);
	int ret;

	mutex_lock(&ov13b->mutex);
	ret = ov13b10_do_get_pad_format(ov13b, sd_state, fmt);
	mutex_unlock(&ov13b->mutex);

	return ret;
}

static int
ov13b10_set_pad_format(struct v4l2_subdev *sd,
		       struct v4l2_subdev_state *sd_state,
		       struct v4l2_subdev_format *fmt)
{
	struct ov13b10 *ov13b = to_ov13b10(sd);
	const struct ov13b10_mode *mode;
	struct v4l2_mbus_framefmt *framefmt;
	s32 vblank_def;
	s32 vblank_min;
	s64 h_blank;
	s64 pixel_rate;
	s64 link_freq;

	mutex_lock(&ov13b->mutex);

	/* Only one raw bayer(GRBG) order is supported */
	if (fmt->format.code != MEDIA_BUS_FMT_SGRBG10_1X10)
		fmt->format.code = MEDIA_BUS_FMT_SGRBG10_1X10;

	mode = v4l2_find_nearest_size(supported_modes,
				      ARRAY_SIZE(supported_modes),
				      width, height,
				      fmt->format.width, fmt->format.height);
	ov13b10_update_pad_format(mode, fmt);
	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
		framefmt = v4l2_subdev_state_get_format(sd_state, fmt->pad);
		*framefmt = fmt->format;
	} else {
		ov13b->cur_mode = mode;
		__v4l2_ctrl_s_ctrl(ov13b->link_freq, mode->link_freq_index);
		link_freq = link_freq_menu_items[mode->link_freq_index];
		pixel_rate = link_freq_to_pixel_rate(link_freq);
		__v4l2_ctrl_s_ctrl_int64(ov13b->pixel_rate, pixel_rate);

		/* Update limits and set FPS to default */
		vblank_def = ov13b->cur_mode->vts_def -
			     ov13b->cur_mode->height;
		vblank_min = ov13b->cur_mode->vts_min -
			     ov13b->cur_mode->height;
		__v4l2_ctrl_modify_range(ov13b->vblank, vblank_min,
					 OV13B10_VTS_MAX
					 - ov13b->cur_mode->height,
					 1,
					 vblank_def);
		__v4l2_ctrl_s_ctrl(ov13b->vblank, vblank_def);
		h_blank =
			link_freq_configs[mode->link_freq_index].pixels_per_line
			 - ov13b->cur_mode->width;
		__v4l2_ctrl_modify_range(ov13b->hblank, h_blank,
					 h_blank, 1, h_blank);
	}

	mutex_unlock(&ov13b->mutex);

	return 0;
}

/* Verify chip ID */
static int ov13b10_identify_module(struct ov13b10 *ov13b)
{
	struct i2c_client *client = v4l2_get_subdevdata(&ov13b->sd);
	int ret;
	u32 val;

	if (ov13b->identified)
		return 0;

	ret = ov13b10_read_reg(ov13b, OV13B10_REG_CHIP_ID,
			       OV13B10_REG_VALUE_24BIT, &val);
	if (ret)
		return ret;

	if (val != OV13B10_CHIP_ID) {
		dev_err(&client->dev, "chip id mismatch: %x!=%x\n",
			OV13B10_CHIP_ID, val);
		return -EIO;
	}

	ov13b->identified = true;

	return 0;
}

static int ov13b10_power_off(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct ov13b10 *ov13b10 = to_ov13b10(sd);

	gpiod_set_value_cansleep(ov13b10->reset, 1);

	if (ov13b10->avdd)
		regulator_disable(ov13b10->avdd);

	clk_disable_unprepare(ov13b10->img_clk);

	return 0;
}

static int ov13b10_power_on(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct ov13b10 *ov13b10 = to_ov13b10(sd);
	int ret;

	ret = clk_prepare_enable(ov13b10->img_clk);
	if (ret < 0) {
		dev_err(dev, "failed to enable imaging clock: %d", ret);
		return ret;
	}

	if (ov13b10->avdd) {
		ret = regulator_enable(ov13b10->avdd);
		if (ret < 0) {
			dev_err(dev, "failed to enable avdd: %d", ret);
			clk_disable_unprepare(ov13b10->img_clk);
			return ret;
		}
	}

	gpiod_set_value_cansleep(ov13b10->reset, 0);
	/* 5ms to wait ready after XSHUTDN assert */
	usleep_range(5000, 5500);

	return 0;
}

static int ov13b10_start_streaming(struct ov13b10 *ov13b)
{
	struct i2c_client *client = v4l2_get_subdevdata(&ov13b->sd);
	const struct ov13b10_reg_list *reg_list;
	int ret, link_freq_index;

	ret = ov13b10_identify_module(ov13b);
	if (ret)
		return ret;

	/* Get out of from software reset */
	ret = ov13b10_write_reg(ov13b, OV13B10_REG_SOFTWARE_RST,
				OV13B10_REG_VALUE_08BIT, OV13B10_SOFTWARE_RST);
	if (ret) {
		dev_err(&client->dev, "%s failed to set powerup registers\n",
			__func__);
		return ret;
	}

	link_freq_index = ov13b->cur_mode->link_freq_index;
	reg_list = &link_freq_configs[link_freq_index].reg_list;
	ret = ov13b10_write_reg_list(ov13b, reg_list);
	if (ret) {
		dev_err(&client->dev, "%s failed to set plls\n", __func__);
		return ret;
	}

	/* Apply default values of current mode */
	reg_list = &ov13b->cur_mode->reg_list;
	ret = ov13b10_write_reg_list(ov13b, reg_list);
	if (ret) {
		dev_err(&client->dev, "%s failed to set mode\n", __func__);
		return ret;
	}

	/* Apply customized values from user */
	ret =  __v4l2_ctrl_handler_setup(ov13b->sd.ctrl_handler);
	if (ret)
		return ret;

	return ov13b10_write_reg(ov13b, OV13B10_REG_MODE_SELECT,
				 OV13B10_REG_VALUE_08BIT,
				 OV13B10_MODE_STREAMING);
}

/* Stop streaming */
static int ov13b10_stop_streaming(struct ov13b10 *ov13b)
{
	return ov13b10_write_reg(ov13b, OV13B10_REG_MODE_SELECT,
				 OV13B10_REG_VALUE_08BIT, OV13B10_MODE_STANDBY);
}

static int ov13b10_set_stream(struct v4l2_subdev *sd, int enable)
{
	struct ov13b10 *ov13b = to_ov13b10(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int ret = 0;

	mutex_lock(&ov13b->mutex);

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

		/*
		 * Apply default & customized values
		 * and then start streaming.
		 */
		ret = ov13b10_start_streaming(ov13b);
		if (ret)
			goto err_rpm_put;
	} else {
		ov13b10_stop_streaming(ov13b);
		pm_runtime_put(&client->dev);
	}

	mutex_unlock(&ov13b->mutex);

	return ret;

err_rpm_put:
	pm_runtime_put(&client->dev);
err_unlock:
	mutex_unlock(&ov13b->mutex);

	return ret;
}

static int ov13b10_suspend(struct device *dev)
{
	ov13b10_power_off(dev);

	return 0;
}

static int ov13b10_resume(struct device *dev)
{
	return ov13b10_power_on(dev);
}

static const struct v4l2_subdev_video_ops ov13b10_video_ops = {
	.s_stream = ov13b10_set_stream,
};

static const struct v4l2_subdev_pad_ops ov13b10_pad_ops = {
	.enum_mbus_code = ov13b10_enum_mbus_code,
	.get_fmt = ov13b10_get_pad_format,
	.set_fmt = ov13b10_set_pad_format,
	.enum_frame_size = ov13b10_enum_frame_size,
};

static const struct v4l2_subdev_ops ov13b10_subdev_ops = {
	.video = &ov13b10_video_ops,
	.pad = &ov13b10_pad_ops,
};

static const struct media_entity_operations ov13b10_subdev_entity_ops = {
	.link_validate = v4l2_subdev_link_validate,
};

static const struct v4l2_subdev_internal_ops ov13b10_internal_ops = {
	.open = ov13b10_open,
};

/* Initialize control handlers */
static int ov13b10_init_controls(struct ov13b10 *ov13b)
{
	struct i2c_client *client = v4l2_get_subdevdata(&ov13b->sd);
	struct v4l2_fwnode_device_properties props;
	struct v4l2_ctrl_handler *ctrl_hdlr;
	s64 exposure_max;
	s64 vblank_def;
	s64 vblank_min;
	s64 hblank;
	s64 pixel_rate_min;
	s64 pixel_rate_max;
	const struct ov13b10_mode *mode;
	u32 max;
	int ret;

	ctrl_hdlr = &ov13b->ctrl_handler;
	ret = v4l2_ctrl_handler_init(ctrl_hdlr, 10);
	if (ret)
		return ret;

	mutex_init(&ov13b->mutex);
	ctrl_hdlr->lock = &ov13b->mutex;
	max = ARRAY_SIZE(link_freq_menu_items) - 1;
	ov13b->link_freq = v4l2_ctrl_new_int_menu(ctrl_hdlr,
						  &ov13b10_ctrl_ops,
						  V4L2_CID_LINK_FREQ,
						  max,
						  0,
						  link_freq_menu_items);
	if (ov13b->link_freq)
		ov13b->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	pixel_rate_max = link_freq_to_pixel_rate(link_freq_menu_items[0]);
	pixel_rate_min = 0;
	/* By default, PIXEL_RATE is read only */
	ov13b->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, &ov13b10_ctrl_ops,
					      V4L2_CID_PIXEL_RATE,
					      pixel_rate_min, pixel_rate_max,
					      1, pixel_rate_max);

	mode = ov13b->cur_mode;
	vblank_def = mode->vts_def - mode->height;
	vblank_min = mode->vts_min - mode->height;
	ov13b->vblank = v4l2_ctrl_new_std(ctrl_hdlr, &ov13b10_ctrl_ops,
					  V4L2_CID_VBLANK,
					  vblank_min,
					  OV13B10_VTS_MAX - mode->height, 1,
					  vblank_def);

	hblank = link_freq_configs[mode->link_freq_index].pixels_per_line -
		 mode->width;
	ov13b->hblank = v4l2_ctrl_new_std(ctrl_hdlr, &ov13b10_ctrl_ops,
					  V4L2_CID_HBLANK,
					  hblank, hblank, 1, hblank);
	if (ov13b->hblank)
		ov13b->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	exposure_max = mode->vts_def - 8;
	ov13b->exposure = v4l2_ctrl_new_std(ctrl_hdlr, &ov13b10_ctrl_ops,
					    V4L2_CID_EXPOSURE,
					    OV13B10_EXPOSURE_MIN,
					    exposure_max, OV13B10_EXPOSURE_STEP,
					    exposure_max);

	v4l2_ctrl_new_std(ctrl_hdlr, &ov13b10_ctrl_ops, V4L2_CID_ANALOGUE_GAIN,
			  OV13B10_ANA_GAIN_MIN, OV13B10_ANA_GAIN_MAX,
			  OV13B10_ANA_GAIN_STEP, OV13B10_ANA_GAIN_DEFAULT);

	/* Digital gain */
	v4l2_ctrl_new_std(ctrl_hdlr, &ov13b10_ctrl_ops, V4L2_CID_DIGITAL_GAIN,
			  OV13B10_DGTL_GAIN_MIN, OV13B10_DGTL_GAIN_MAX,
			  OV13B10_DGTL_GAIN_STEP, OV13B10_DGTL_GAIN_DEFAULT);

	v4l2_ctrl_new_std_menu_items(ctrl_hdlr, &ov13b10_ctrl_ops,
				     V4L2_CID_TEST_PATTERN,
				     ARRAY_SIZE(ov13b10_test_pattern_menu) - 1,
				     0, 0, ov13b10_test_pattern_menu);

	v4l2_ctrl_new_std(ctrl_hdlr, &ov13b10_ctrl_ops,
			  V4L2_CID_HFLIP, 0, 1, 1, 0);
	v4l2_ctrl_new_std(ctrl_hdlr, &ov13b10_ctrl_ops,
			  V4L2_CID_VFLIP, 0, 1, 1, 0);

	if (ctrl_hdlr->error) {
		ret = ctrl_hdlr->error;
		dev_err(&client->dev, "%s control init failed (%d)\n",
			__func__, ret);
		goto error;
	}

	ret = v4l2_fwnode_device_parse(&client->dev, &props);
	if (ret)
		goto error;

	ret = v4l2_ctrl_new_fwnode_properties(ctrl_hdlr, &ov13b10_ctrl_ops,
					      &props);
	if (ret)
		goto error;

	ov13b->sd.ctrl_handler = ctrl_hdlr;

	return 0;

error:
	v4l2_ctrl_handler_free(ctrl_hdlr);
	mutex_destroy(&ov13b->mutex);

	return ret;
}

static void ov13b10_free_controls(struct ov13b10 *ov13b)
{
	v4l2_ctrl_handler_free(ov13b->sd.ctrl_handler);
	mutex_destroy(&ov13b->mutex);
}

static int ov13b10_get_pm_resources(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct ov13b10 *ov13b = to_ov13b10(sd);
	int ret;

	ov13b->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
	if (IS_ERR(ov13b->reset))
		return dev_err_probe(dev, PTR_ERR(ov13b->reset),
				     "failed to get reset gpio\n");

	ov13b->img_clk = devm_clk_get_optional(dev, NULL);
	if (IS_ERR(ov13b->img_clk))
		return dev_err_probe(dev, PTR_ERR(ov13b->img_clk),
				     "failed to get imaging clock\n");

	ov13b->avdd = devm_regulator_get_optional(dev, "avdd");
	if (IS_ERR(ov13b->avdd)) {
		ret = PTR_ERR(ov13b->avdd);
		ov13b->avdd = NULL;
		if (ret != -ENODEV)
			return dev_err_probe(dev, ret,
					     "failed to get avdd regulator\n");
	}

	return 0;
}

static int ov13b10_check_hwcfg(struct device *dev)
{
	struct v4l2_fwnode_endpoint bus_cfg = {
		.bus_type = V4L2_MBUS_CSI2_DPHY
	};
	struct fwnode_handle *ep;
	struct fwnode_handle *fwnode = dev_fwnode(dev);
	unsigned int i, j;
	int ret;
	u32 ext_clk;

	if (!fwnode)
		return -ENXIO;

	ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
	if (!ep)
		return -EPROBE_DEFER;

	ret = fwnode_property_read_u32(dev_fwnode(dev), "clock-frequency",
				       &ext_clk);
	if (ret) {
		dev_err(dev, "can't get clock frequency");
		return ret;
	}

	if (ext_clk != OV13B10_EXT_CLK) {
		dev_err(dev, "external clock %d is not supported",
			ext_clk);
		return -EINVAL;
	}

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

	if (bus_cfg.bus.mipi_csi2.num_data_lanes != OV13B10_DATA_LANES) {
		dev_err(dev, "number of CSI2 data lanes %d is not supported",
			bus_cfg.bus.mipi_csi2.num_data_lanes);
		ret = -EINVAL;
		goto out_err;
	}

	if (!bus_cfg.nr_of_link_frequencies) {
		dev_err(dev, "no link frequencies defined");
		ret = -EINVAL;
		goto out_err;
	}

	for (i = 0; i < ARRAY_SIZE(link_freq_menu_items); i++) {
		for (j = 0; j < bus_cfg.nr_of_link_frequencies; j++) {
			if (link_freq_menu_items[i] ==
				bus_cfg.link_frequencies[j])
				break;
		}

		if (j == bus_cfg.nr_of_link_frequencies) {
			dev_err(dev, "no link frequency %lld supported",
				link_freq_menu_items[i]);
			ret = -EINVAL;
			goto out_err;
		}
	}

out_err:
	v4l2_fwnode_endpoint_free(&bus_cfg);

	return ret;
}

static int ov13b10_probe(struct i2c_client *client)
{
	struct ov13b10 *ov13b;
	bool full_power;
	int ret;

	/* Check HW config */
	ret = ov13b10_check_hwcfg(&client->dev);
	if (ret) {
		dev_err(&client->dev, "failed to check hwcfg: %d", ret);
		return ret;
	}

	ov13b = devm_kzalloc(&client->dev, sizeof(*ov13b), GFP_KERNEL);
	if (!ov13b)
		return -ENOMEM;

	/* Initialize subdev */
	v4l2_i2c_subdev_init(&ov13b->sd, client, &ov13b10_subdev_ops);

	ret = ov13b10_get_pm_resources(&client->dev);
	if (ret)
		return ret;

	full_power = acpi_dev_state_d0(&client->dev);
	if (full_power) {
		ret = ov13b10_power_on(&client->dev);
		if (ret) {
			dev_err(&client->dev, "failed to power on\n");
			return ret;
		}

		/* Check module identity */
		ret = ov13b10_identify_module(ov13b);
		if (ret) {
			dev_err(&client->dev, "failed to find sensor: %d\n", ret);
			goto error_power_off;
		}
	}

	/* Set default mode to max resolution */
	ov13b->cur_mode = &supported_modes[0];

	ret = ov13b10_init_controls(ov13b);
	if (ret)
		goto error_power_off;

	/* Initialize subdev */
	ov13b->sd.internal_ops = &ov13b10_internal_ops;
	ov13b->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	ov13b->sd.entity.ops = &ov13b10_subdev_entity_ops;
	ov13b->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;

	/* Initialize source pad */
	ov13b->pad.flags = MEDIA_PAD_FL_SOURCE;
	ret = media_entity_pads_init(&ov13b->sd.entity, 1, &ov13b->pad);
	if (ret) {
		dev_err(&client->dev, "%s failed:%d\n", __func__, ret);
		goto error_handler_free;
	}


	/*
	 * Device is already turned on by i2c-core with ACPI domain PM.
	 * Enable runtime PM and turn off the device.
	 */
	/* Set the device's state to active if it's in D0 state. */
	if (full_power)
		pm_runtime_set_active(&client->dev);
	pm_runtime_enable(&client->dev);
	pm_runtime_idle(&client->dev);

	ret = v4l2_async_register_subdev_sensor(&ov13b->sd);
	if (ret < 0)
		goto error_media_entity_runtime_pm;

	return 0;

error_media_entity_runtime_pm:
	pm_runtime_disable(&client->dev);
	if (full_power)
		pm_runtime_set_suspended(&client->dev);
	media_entity_cleanup(&ov13b->sd.entity);

error_handler_free:
	ov13b10_free_controls(ov13b);
	dev_err(&client->dev, "%s failed:%d\n", __func__, ret);

error_power_off:
	ov13b10_power_off(&client->dev);

	return ret;
}

static void ov13b10_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov13b10 *ov13b = to_ov13b10(sd);

	v4l2_async_unregister_subdev(sd);
	media_entity_cleanup(&sd->entity);
	ov13b10_free_controls(ov13b);

	pm_runtime_disable(&client->dev);
	pm_runtime_set_suspended(&client->dev);
}

static DEFINE_RUNTIME_DEV_PM_OPS(ov13b10_pm_ops, ov13b10_suspend,
				 ov13b10_resume, NULL);

#ifdef CONFIG_ACPI
static const struct acpi_device_id ov13b10_acpi_ids[] = {
	{"OVTIDB10"},
	{"OVTI13B1"},
	{ /* sentinel */ }
};

MODULE_DEVICE_TABLE(acpi, ov13b10_acpi_ids);
#endif

static struct i2c_driver ov13b10_i2c_driver = {
	.driver = {
		.name = "ov13b10",
		.pm = pm_ptr(&ov13b10_pm_ops),
		.acpi_match_table = ACPI_PTR(ov13b10_acpi_ids),
	},
	.probe = ov13b10_probe,
	.remove = ov13b10_remove,
	.flags = I2C_DRV_ACPI_WAIVE_D0_PROBE,
};

module_i2c_driver(ov13b10_i2c_driver);

MODULE_AUTHOR("Kao, Arec <arec.kao@intel.com>");
MODULE_DESCRIPTION("Omnivision ov13b10 sensor driver");
MODULE_LICENSE("GPL v2");