// SPDX-License-Identifier: GPL-2.0
/*
 * ov5695 driver
 *
 * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd.
 */

#include <linux/clk.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/sysfs.h>
#include <media/media-entity.h>
#include <media/v4l2-async.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-subdev.h>

#ifndef V4L2_CID_DIGITAL_GAIN
#define V4L2_CID_DIGITAL_GAIN		V4L2_CID_GAIN
#endif

/* 45Mhz * 4 Binning */
#define OV5695_PIXEL_RATE		(45 * 1000 * 1000 * 4)
#define OV5695_XVCLK_FREQ		24000000

#define CHIP_ID				0x005695
#define OV5695_REG_CHIP_ID		0x300a

#define OV5695_REG_CTRL_MODE		0x0100
#define OV5695_MODE_SW_STANDBY		0x0
#define OV5695_MODE_STREAMING		BIT(0)

#define OV5695_REG_EXPOSURE		0x3500
#define	OV5695_EXPOSURE_MIN		4
#define	OV5695_EXPOSURE_STEP		1
#define OV5695_VTS_MAX			0x7fff

#define OV5695_REG_ANALOG_GAIN		0x3509
#define	ANALOG_GAIN_MIN			0x10
#define	ANALOG_GAIN_MAX			0xf8
#define	ANALOG_GAIN_STEP		1
#define	ANALOG_GAIN_DEFAULT		0xf8

#define OV5695_REG_DIGI_GAIN_H		0x350a
#define OV5695_REG_DIGI_GAIN_L		0x350b
#define OV5695_DIGI_GAIN_L_MASK		0x3f
#define OV5695_DIGI_GAIN_H_SHIFT	6
#define OV5695_DIGI_GAIN_MIN		0
#define OV5695_DIGI_GAIN_MAX		(0x4000 - 1)
#define OV5695_DIGI_GAIN_STEP		1
#define OV5695_DIGI_GAIN_DEFAULT	1024

#define OV5695_REG_TEST_PATTERN		0x4503
#define	OV5695_TEST_PATTERN_ENABLE	0x80
#define	OV5695_TEST_PATTERN_DISABLE	0x0

#define OV5695_REG_VTS			0x380e

#define REG_NULL			0xFFFF

#define OV5695_REG_VALUE_08BIT		1
#define OV5695_REG_VALUE_16BIT		2
#define OV5695_REG_VALUE_24BIT		3

#define OV5695_LANES			2
#define OV5695_BITS_PER_SAMPLE		10

static const char * const ov5695_supply_names[] = {
	"avdd",		/* Analog power */
	"dovdd",	/* Digital I/O power */
	"dvdd",		/* Digital core power */
};

#define OV5695_NUM_SUPPLIES ARRAY_SIZE(ov5695_supply_names)

struct regval {
	u16 addr;
	u8 val;
};

struct ov5695_mode {
	u32 width;
	u32 height;
	u32 max_fps;
	u32 hts_def;
	u32 vts_def;
	u32 exp_def;
	const struct regval *reg_list;
};

struct ov5695 {
	struct i2c_client	*client;
	struct clk		*xvclk;
	struct gpio_desc	*reset_gpio;
	struct regulator_bulk_data supplies[OV5695_NUM_SUPPLIES];

	struct v4l2_subdev	subdev;
	struct media_pad	pad;
	struct v4l2_ctrl_handler ctrl_handler;
	struct v4l2_ctrl	*exposure;
	struct v4l2_ctrl	*anal_gain;
	struct v4l2_ctrl	*digi_gain;
	struct v4l2_ctrl	*hblank;
	struct v4l2_ctrl	*vblank;
	struct v4l2_ctrl	*test_pattern;
	struct mutex		mutex;
	const struct ov5695_mode *cur_mode;
};

#define to_ov5695(sd) container_of(sd, struct ov5695, subdev)

/*
 * Xclk 24Mhz
 * Pclk 45Mhz
 * linelength 672(0x2a0)
 * framelength 2232(0x8b8)
 * grabwindow_width 1296
 * grabwindow_height 972
 * max_framerate 30fps
 * mipi_datarate per lane 840Mbps
 */
static const struct regval ov5695_global_regs[] = {
	{0x0103, 0x01},
	{0x0100, 0x00},
	{0x0300, 0x04},
	{0x0301, 0x00},
	{0x0302, 0x69},
	{0x0303, 0x00},
	{0x0304, 0x00},
	{0x0305, 0x01},
	{0x0307, 0x00},
	{0x030b, 0x00},
	{0x030c, 0x00},
	{0x030d, 0x1e},
	{0x030e, 0x04},
	{0x030f, 0x03},
	{0x0312, 0x01},
	{0x3000, 0x00},
	{0x3002, 0xa1},
	{0x3008, 0x00},
	{0x3010, 0x00},
	{0x3022, 0x51},
	{0x3106, 0x15},
	{0x3107, 0x01},
	{0x3108, 0x05},
	{0x3500, 0x00},
	{0x3501, 0x45},
	{0x3502, 0x00},
	{0x3503, 0x08},
	{0x3504, 0x03},
	{0x3505, 0x8c},
	{0x3507, 0x03},
	{0x3508, 0x00},
	{0x3509, 0x10},
	{0x350c, 0x00},
	{0x350d, 0x80},
	{0x3510, 0x00},
	{0x3511, 0x02},
	{0x3512, 0x00},
	{0x3601, 0x55},
	{0x3602, 0x58},
	{0x3614, 0x30},
	{0x3615, 0x77},
	{0x3621, 0x08},
	{0x3624, 0x40},
	{0x3633, 0x0c},
	{0x3634, 0x0c},
	{0x3635, 0x0c},
	{0x3636, 0x0c},
	{0x3638, 0x00},
	{0x3639, 0x00},
	{0x363a, 0x00},
	{0x363b, 0x00},
	{0x363c, 0xff},
	{0x363d, 0xfa},
	{0x3650, 0x44},
	{0x3651, 0x44},
	{0x3652, 0x44},
	{0x3653, 0x44},
	{0x3654, 0x44},
	{0x3655, 0x44},
	{0x3656, 0x44},
	{0x3657, 0x44},
	{0x3660, 0x00},
	{0x3661, 0x00},
	{0x3662, 0x00},
	{0x366a, 0x00},
	{0x366e, 0x0c},
	{0x3673, 0x04},
	{0x3700, 0x14},
	{0x3703, 0x0c},
	{0x3715, 0x01},
	{0x3733, 0x10},
	{0x3734, 0x40},
	{0x373f, 0xa0},
	{0x3765, 0x20},
	{0x37a1, 0x1d},
	{0x37a8, 0x26},
	{0x37ab, 0x14},
	{0x37c2, 0x04},
	{0x37cb, 0x09},
	{0x37cc, 0x13},
	{0x37cd, 0x1f},
	{0x37ce, 0x1f},
	{0x3800, 0x00},
	{0x3801, 0x00},
	{0x3802, 0x00},
	{0x3803, 0x00},
	{0x3804, 0x0a},
	{0x3805, 0x3f},
	{0x3806, 0x07},
	{0x3807, 0xaf},
	{0x3808, 0x05},
	{0x3809, 0x10},
	{0x380a, 0x03},
	{0x380b, 0xcc},
	{0x380c, 0x02},
	{0x380d, 0xa0},
	{0x380e, 0x08},
	{0x380f, 0xb8},
	{0x3810, 0x00},
	{0x3811, 0x06},
	{0x3812, 0x00},
	{0x3813, 0x06},
	{0x3814, 0x03},
	{0x3815, 0x01},
	{0x3816, 0x03},
	{0x3817, 0x01},
	{0x3818, 0x00},
	{0x3819, 0x00},
	{0x381a, 0x00},
	{0x381b, 0x01},
	{0x3820, 0x8b},
	{0x3821, 0x01},
	{0x3c80, 0x08},
	{0x3c82, 0x00},
	{0x3c83, 0x00},
	{0x3c88, 0x00},
	{0x3d85, 0x14},
	{0x3f02, 0x08},
	{0x3f03, 0x10},
	{0x4008, 0x02},
	{0x4009, 0x09},
	{0x404e, 0x20},
	{0x4501, 0x00},
	{0x4502, 0x10},
	{0x4800, 0x00},
	{0x481f, 0x2a},
	{0x4837, 0x13},
	{0x5000, 0x17},
	{0x5780, 0x3e},
	{0x5781, 0x0f},
	{0x5782, 0x44},
	{0x5783, 0x02},
	{0x5784, 0x01},
	{0x5785, 0x01},
	{0x5786, 0x00},
	{0x5787, 0x04},
	{0x5788, 0x02},
	{0x5789, 0x0f},
	{0x578a, 0xfd},
	{0x578b, 0xf5},
	{0x578c, 0xf5},
	{0x578d, 0x03},
	{0x578e, 0x08},
	{0x578f, 0x0c},
	{0x5790, 0x08},
	{0x5791, 0x06},
	{0x5792, 0x00},
	{0x5793, 0x52},
	{0x5794, 0xa3},
	{0x5b00, 0x00},
	{0x5b01, 0x1c},
	{0x5b02, 0x00},
	{0x5b03, 0x7f},
	{0x5b05, 0x6c},
	{0x5e10, 0xfc},
	{0x4010, 0xf1},
	{0x3503, 0x08},
	{0x3505, 0x8c},
	{0x3507, 0x03},
	{0x3508, 0x00},
	{0x3509, 0xf8},
	{REG_NULL, 0x00},
};

/*
 * Xclk 24Mhz
 * Pclk 45Mhz
 * linelength 740(0x2e4)
 * framelength 2024(0x7e8)
 * grabwindow_width 2592
 * grabwindow_height 1944
 * max_framerate 30fps
 * mipi_datarate per lane 840Mbps
 */
static const struct regval ov5695_2592x1944_regs[] = {
	{0x3501, 0x7e},
	{0x366e, 0x18},
	{0x3800, 0x00},
	{0x3801, 0x00},
	{0x3802, 0x00},
	{0x3803, 0x04},
	{0x3804, 0x0a},
	{0x3805, 0x3f},
	{0x3806, 0x07},
	{0x3807, 0xab},
	{0x3808, 0x0a},
	{0x3809, 0x20},
	{0x380a, 0x07},
	{0x380b, 0x98},
	{0x380c, 0x02},
	{0x380d, 0xe4},
	{0x380e, 0x07},
	{0x380f, 0xe8},
	{0x3811, 0x06},
	{0x3813, 0x08},
	{0x3814, 0x01},
	{0x3816, 0x01},
	{0x3817, 0x01},
	{0x3820, 0x88},
	{0x3821, 0x00},
	{0x4501, 0x00},
	{0x4008, 0x04},
	{0x4009, 0x13},
	{REG_NULL, 0x00},
};

/*
 * Xclk 24Mhz
 * Pclk 45Mhz
 * linelength 672(0x2a0)
 * framelength 2232(0x8b8)
 * grabwindow_width 1920
 * grabwindow_height 1080
 * max_framerate 30fps
 * mipi_datarate per lane 840Mbps
 */
static const struct regval ov5695_1920x1080_regs[] = {
	{0x3501, 0x45},
	{0x366e, 0x18},
	{0x3800, 0x01},
	{0x3801, 0x50},
	{0x3802, 0x01},
	{0x3803, 0xb8},
	{0x3804, 0x08},
	{0x3805, 0xef},
	{0x3806, 0x05},
	{0x3807, 0xf7},
	{0x3808, 0x07},
	{0x3809, 0x80},
	{0x380a, 0x04},
	{0x380b, 0x38},
	{0x380c, 0x02},
	{0x380d, 0xa0},
	{0x380e, 0x08},
	{0x380f, 0xb8},
	{0x3811, 0x06},
	{0x3813, 0x04},
	{0x3814, 0x01},
	{0x3816, 0x01},
	{0x3817, 0x01},
	{0x3820, 0x88},
	{0x3821, 0x00},
	{0x4501, 0x00},
	{0x4008, 0x04},
	{0x4009, 0x13},
	{REG_NULL, 0x00}
};

/*
 * Xclk 24Mhz
 * Pclk 45Mhz
 * linelength 740(0x02e4)
 * framelength 1012(0x03f4)
 * grabwindow_width 1296
 * grabwindow_height 972
 * max_framerate 60fps
 * mipi_datarate per lane 840Mbps
 */
static const struct regval ov5695_1296x972_regs[] = {
	{0x0103, 0x01},
	{0x0100, 0x00},
	{0x0300, 0x04},
	{0x0301, 0x00},
	{0x0302, 0x69},
	{0x0303, 0x00},
	{0x0304, 0x00},
	{0x0305, 0x01},
	{0x0307, 0x00},
	{0x030b, 0x00},
	{0x030c, 0x00},
	{0x030d, 0x1e},
	{0x030e, 0x04},
	{0x030f, 0x03},
	{0x0312, 0x01},
	{0x3000, 0x00},
	{0x3002, 0xa1},
	{0x3008, 0x00},
	{0x3010, 0x00},
	{0x3016, 0x32},
	{0x3022, 0x51},
	{0x3106, 0x15},
	{0x3107, 0x01},
	{0x3108, 0x05},
	{0x3500, 0x00},
	{0x3501, 0x3e},
	{0x3502, 0x00},
	{0x3503, 0x08},
	{0x3504, 0x03},
	{0x3505, 0x8c},
	{0x3507, 0x03},
	{0x3508, 0x00},
	{0x3509, 0x10},
	{0x350c, 0x00},
	{0x350d, 0x80},
	{0x3510, 0x00},
	{0x3511, 0x02},
	{0x3512, 0x00},
	{0x3601, 0x55},
	{0x3602, 0x58},
	{0x3611, 0x58},
	{0x3614, 0x30},
	{0x3615, 0x77},
	{0x3621, 0x08},
	{0x3624, 0x40},
	{0x3633, 0x0c},
	{0x3634, 0x0c},
	{0x3635, 0x0c},
	{0x3636, 0x0c},
	{0x3638, 0x00},
	{0x3639, 0x00},
	{0x363a, 0x00},
	{0x363b, 0x00},
	{0x363c, 0xff},
	{0x363d, 0xfa},
	{0x3650, 0x44},
	{0x3651, 0x44},
	{0x3652, 0x44},
	{0x3653, 0x44},
	{0x3654, 0x44},
	{0x3655, 0x44},
	{0x3656, 0x44},
	{0x3657, 0x44},
	{0x3660, 0x00},
	{0x3661, 0x00},
	{0x3662, 0x00},
	{0x366a, 0x00},
	{0x366e, 0x0c},
	{0x3673, 0x04},
	{0x3700, 0x14},
	{0x3703, 0x0c},
	{0x3706, 0x24},
	{0x3714, 0x27},
	{0x3715, 0x01},
	{0x3716, 0x00},
	{0x3717, 0x02},
	{0x3733, 0x10},
	{0x3734, 0x40},
	{0x373f, 0xa0},
	{0x3765, 0x20},
	{0x37a1, 0x1d},
	{0x37a8, 0x26},
	{0x37ab, 0x14},
	{0x37c2, 0x04},
	{0x37c3, 0xf0},
	{0x37cb, 0x09},
	{0x37cc, 0x13},
	{0x37cd, 0x1f},
	{0x37ce, 0x1f},
	{0x3800, 0x00},
	{0x3801, 0x00},
	{0x3802, 0x00},
	{0x3803, 0x00},
	{0x3804, 0x0a},
	{0x3805, 0x3f},
	{0x3806, 0x07},
	{0x3807, 0xaf},
	{0x3808, 0x05},
	{0x3809, 0x10},
	{0x380a, 0x03},
	{0x380b, 0xcc},
	{0x380c, 0x02},
	{0x380d, 0xe4},
	{0x380e, 0x03},
	{0x380f, 0xf4},
	{0x3810, 0x00},
	{0x3811, 0x00},
	{0x3812, 0x00},
	{0x3813, 0x06},
	{0x3814, 0x03},
	{0x3815, 0x01},
	{0x3816, 0x03},
	{0x3817, 0x01},
	{0x3818, 0x00},
	{0x3819, 0x00},
	{0x381a, 0x00},
	{0x381b, 0x01},
	{0x3820, 0x8b},
	{0x3821, 0x01},
	{0x3c80, 0x08},
	{0x3c82, 0x00},
	{0x3c83, 0x00},
	{0x3c88, 0x00},
	{0x3d85, 0x14},
	{0x3f02, 0x08},
	{0x3f03, 0x10},
	{0x4008, 0x02},
	{0x4009, 0x09},
	{0x404e, 0x20},
	{0x4501, 0x00},
	{0x4502, 0x10},
	{0x4800, 0x00},
	{0x481f, 0x2a},
	{0x4837, 0x13},
	{0x5000, 0x13},
	{0x5780, 0x3e},
	{0x5781, 0x0f},
	{0x5782, 0x44},
	{0x5783, 0x02},
	{0x5784, 0x01},
	{0x5785, 0x01},
	{0x5786, 0x00},
	{0x5787, 0x04},
	{0x5788, 0x02},
	{0x5789, 0x0f},
	{0x578a, 0xfd},
	{0x578b, 0xf5},
	{0x578c, 0xf5},
	{0x578d, 0x03},
	{0x578e, 0x08},
	{0x578f, 0x0c},
	{0x5790, 0x08},
	{0x5791, 0x06},
	{0x5792, 0x00},
	{0x5793, 0x52},
	{0x5794, 0xa3},
	{0x5b00, 0x00},
	{0x5b01, 0x1c},
	{0x5b02, 0x00},
	{0x5b03, 0x7f},
	{0x5b05, 0x6c},
	{0x5e10, 0xfc},
	{0x4010, 0xf1},
	{0x3503, 0x08},
	{0x3505, 0x8c},
	{0x3507, 0x03},
	{0x3508, 0x00},
	{0x3509, 0xf8},
	{0x0100, 0x01},
	{REG_NULL, 0x00}
};

/*
 * Xclk 24Mhz
 * Pclk 45Mhz
 * linelength 672(0x2a0)
 * framelength 2232(0x8b8)
 * grabwindow_width 1280
 * grabwindow_height 720
 * max_framerate 30fps
 * mipi_datarate per lane 840Mbps
 */
static const struct regval ov5695_1280x720_regs[] = {
	{0x3501, 0x45},
	{0x366e, 0x0c},
	{0x3800, 0x00},
	{0x3801, 0x00},
	{0x3802, 0x01},
	{0x3803, 0x00},
	{0x3804, 0x0a},
	{0x3805, 0x3f},
	{0x3806, 0x06},
	{0x3807, 0xaf},
	{0x3808, 0x05},
	{0x3809, 0x00},
	{0x380a, 0x02},
	{0x380b, 0xd0},
	{0x380c, 0x02},
	{0x380d, 0xa0},
	{0x380e, 0x08},
	{0x380f, 0xb8},
	{0x3811, 0x06},
	{0x3813, 0x02},
	{0x3814, 0x03},
	{0x3816, 0x03},
	{0x3817, 0x01},
	{0x3820, 0x8b},
	{0x3821, 0x01},
	{0x4501, 0x00},
	{0x4008, 0x02},
	{0x4009, 0x09},
	{REG_NULL, 0x00}
};

/*
 * Xclk 24Mhz
 * Pclk 45Mhz
 * linelength 672(0x2a0)
 * framelength 558(0x22e)
 * grabwindow_width 640
 * grabwindow_height 480
 * max_framerate 120fps
 * mipi_datarate per lane 840Mbps
 */
static const struct regval ov5695_640x480_regs[] = {
	{0x3501, 0x22},
	{0x366e, 0x0c},
	{0x3800, 0x00},
	{0x3801, 0x00},
	{0x3802, 0x00},
	{0x3803, 0x08},
	{0x3804, 0x0a},
	{0x3805, 0x3f},
	{0x3806, 0x07},
	{0x3807, 0xa7},
	{0x3808, 0x02},
	{0x3809, 0x80},
	{0x380a, 0x01},
	{0x380b, 0xe0},
	{0x380c, 0x02},
	{0x380d, 0xa0},
	{0x380e, 0x02},
	{0x380f, 0x2e},
	{0x3811, 0x06},
	{0x3813, 0x04},
	{0x3814, 0x07},
	{0x3816, 0x05},
	{0x3817, 0x03},
	{0x3820, 0x8d},
	{0x3821, 0x01},
	{0x4501, 0x00},
	{0x4008, 0x02},
	{0x4009, 0x09},
	{REG_NULL, 0x00}
};

static const struct ov5695_mode supported_modes[] = {
	{
		.width = 2592,
		.height = 1944,
		.max_fps = 30,
		.exp_def = 0x0450,
		.hts_def = 0x02e4 * 4,
		.vts_def = 0x07e8,
		.reg_list = ov5695_2592x1944_regs,
	},
	{
		.width = 1920,
		.height = 1080,
		.max_fps = 30,
		.exp_def = 0x0450,
		.hts_def = 0x02a0 * 4,
		.vts_def = 0x08b8,
		.reg_list = ov5695_1920x1080_regs,
	},
	{
		.width = 1296,
		.height = 972,
		.max_fps = 60,
		.exp_def = 0x03e0,
		.hts_def = 0x02e4 * 4,
		.vts_def = 0x03f4,
		.reg_list = ov5695_1296x972_regs,
	},
	{
		.width = 1280,
		.height = 720,
		.max_fps = 30,
		.exp_def = 0x0450,
		.hts_def = 0x02a0 * 4,
		.vts_def = 0x08b8,
		.reg_list = ov5695_1280x720_regs,
	},
	{
		.width = 640,
		.height = 480,
		.max_fps = 120,
		.exp_def = 0x0450,
		.hts_def = 0x02a0 * 4,
		.vts_def = 0x022e,
		.reg_list = ov5695_640x480_regs,
	},
};

#define OV5695_LINK_FREQ_420MHZ		420000000
static const s64 link_freq_menu_items[] = {
	OV5695_LINK_FREQ_420MHZ
};

static const char * const ov5695_test_pattern_menu[] = {
	"Disabled",
	"Vertical Color Bar Type 1",
	"Vertical Color Bar Type 2",
	"Vertical Color Bar Type 3",
	"Vertical Color Bar Type 4"
};

/* Write registers up to 4 at a time */
static int ov5695_write_reg(struct i2c_client *client, u16 reg,
			    u32 len, u32 val)
{
	u32 buf_i, val_i;
	u8 buf[6];
	u8 *val_p;
	__be32 val_be;

	if (len > 4)
		return -EINVAL;

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

	val_be = cpu_to_be32(val);
	val_p = (u8 *)&val_be;
	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;
}

static int ov5695_write_array(struct i2c_client *client,
			      const struct regval *regs)
{
	u32 i;
	int ret = 0;

	for (i = 0; ret == 0 && regs[i].addr != REG_NULL; i++)
		ret = ov5695_write_reg(client, regs[i].addr,
				       OV5695_REG_VALUE_08BIT, regs[i].val);

	return ret;
}

/* Read registers up to 4 at a time */
static int ov5695_read_reg(struct i2c_client *client, u16 reg, unsigned int len,
			   u32 *val)
{
	struct i2c_msg msgs[2];
	u8 *data_be_p;
	__be32 data_be = 0;
	__be16 reg_addr_be = cpu_to_be16(reg);
	int ret;

	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;
}

static int ov5695_get_reso_dist(const struct ov5695_mode *mode,
				struct v4l2_mbus_framefmt *framefmt)
{
	return abs(mode->width - framefmt->width) +
	       abs(mode->height - framefmt->height);
}

static const struct ov5695_mode *
ov5695_find_best_fit(struct v4l2_subdev_format *fmt)
{
	struct v4l2_mbus_framefmt *framefmt = &fmt->format;
	int dist;
	int cur_best_fit = 0;
	int cur_best_fit_dist = -1;
	int i;

	for (i = 0; i < ARRAY_SIZE(supported_modes); i++) {
		dist = ov5695_get_reso_dist(&supported_modes[i], framefmt);
		if (cur_best_fit_dist == -1 || dist < cur_best_fit_dist) {
			cur_best_fit_dist = dist;
			cur_best_fit = i;
		}
	}

	return &supported_modes[cur_best_fit];
}

static int ov5695_set_fmt(struct v4l2_subdev *sd,
			  struct v4l2_subdev_state *sd_state,
			  struct v4l2_subdev_format *fmt)
{
	struct ov5695 *ov5695 = to_ov5695(sd);
	const struct ov5695_mode *mode;
	s64 h_blank, vblank_def;

	mutex_lock(&ov5695->mutex);

	mode = ov5695_find_best_fit(fmt);
	fmt->format.code = MEDIA_BUS_FMT_SBGGR10_1X10;
	fmt->format.width = mode->width;
	fmt->format.height = mode->height;
	fmt->format.field = V4L2_FIELD_NONE;
	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
		*v4l2_subdev_state_get_format(sd_state, fmt->pad) = fmt->format;
	} else {
		ov5695->cur_mode = mode;
		h_blank = mode->hts_def - mode->width;
		__v4l2_ctrl_modify_range(ov5695->hblank, h_blank,
					 h_blank, 1, h_blank);
		vblank_def = mode->vts_def - mode->height;
		__v4l2_ctrl_modify_range(ov5695->vblank, vblank_def,
					 OV5695_VTS_MAX - mode->height,
					 1, vblank_def);
	}

	mutex_unlock(&ov5695->mutex);

	return 0;
}

static int ov5695_get_fmt(struct v4l2_subdev *sd,
			  struct v4l2_subdev_state *sd_state,
			  struct v4l2_subdev_format *fmt)
{
	struct ov5695 *ov5695 = to_ov5695(sd);
	const struct ov5695_mode *mode = ov5695->cur_mode;

	mutex_lock(&ov5695->mutex);
	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
		fmt->format = *v4l2_subdev_state_get_format(sd_state,
							    fmt->pad);
	} else {
		fmt->format.width = mode->width;
		fmt->format.height = mode->height;
		fmt->format.code = MEDIA_BUS_FMT_SBGGR10_1X10;
		fmt->format.field = V4L2_FIELD_NONE;
	}
	mutex_unlock(&ov5695->mutex);

	return 0;
}

static int ov5695_enum_mbus_code(struct v4l2_subdev *sd,
				 struct v4l2_subdev_state *sd_state,
				 struct v4l2_subdev_mbus_code_enum *code)
{
	if (code->index != 0)
		return -EINVAL;
	code->code = MEDIA_BUS_FMT_SBGGR10_1X10;

	return 0;
}

static int ov5695_enum_frame_sizes(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_SBGGR10_1X10)
		return -EINVAL;

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

	return 0;
}

static int ov5695_enable_test_pattern(struct ov5695 *ov5695, u32 pattern)
{
	u32 val;

	if (pattern)
		val = (pattern - 1) | OV5695_TEST_PATTERN_ENABLE;
	else
		val = OV5695_TEST_PATTERN_DISABLE;

	return ov5695_write_reg(ov5695->client, OV5695_REG_TEST_PATTERN,
				OV5695_REG_VALUE_08BIT, val);
}

static int __ov5695_start_stream(struct ov5695 *ov5695)
{
	int ret;

	ret = ov5695_write_array(ov5695->client, ov5695_global_regs);
	if (ret)
		return ret;
	ret = ov5695_write_array(ov5695->client, ov5695->cur_mode->reg_list);
	if (ret)
		return ret;

	/* In case these controls are set before streaming */
	ret = __v4l2_ctrl_handler_setup(&ov5695->ctrl_handler);
	if (ret)
		return ret;

	return ov5695_write_reg(ov5695->client, OV5695_REG_CTRL_MODE,
				OV5695_REG_VALUE_08BIT, OV5695_MODE_STREAMING);
}

static int __ov5695_stop_stream(struct ov5695 *ov5695)
{
	return ov5695_write_reg(ov5695->client, OV5695_REG_CTRL_MODE,
				OV5695_REG_VALUE_08BIT, OV5695_MODE_SW_STANDBY);
}

static int ov5695_s_stream(struct v4l2_subdev *sd, int on)
{
	struct ov5695 *ov5695 = to_ov5695(sd);
	struct i2c_client *client = ov5695->client;
	int ret = 0;

	mutex_lock(&ov5695->mutex);

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

		ret = __ov5695_start_stream(ov5695);
		if (ret) {
			v4l2_err(sd, "start stream failed while write regs\n");
			pm_runtime_put(&client->dev);
			goto unlock_and_return;
		}
	} else {
		__ov5695_stop_stream(ov5695);
		pm_runtime_put(&client->dev);
	}

unlock_and_return:
	mutex_unlock(&ov5695->mutex);

	return ret;
}

static int __ov5695_power_on(struct ov5695 *ov5695)
{
	int i, ret;
	struct device *dev = &ov5695->client->dev;

	ret = clk_prepare_enable(ov5695->xvclk);
	if (ret < 0) {
		dev_err(dev, "Failed to enable xvclk\n");
		return ret;
	}

	gpiod_set_value_cansleep(ov5695->reset_gpio, 1);

	/*
	 * The hardware requires the regulators to be powered on in order,
	 * so enable them one by one.
	 */
	for (i = 0; i < OV5695_NUM_SUPPLIES; i++) {
		ret = regulator_enable(ov5695->supplies[i].consumer);
		if (ret) {
			dev_err(dev, "Failed to enable %s: %d\n",
				ov5695->supplies[i].supply, ret);
			goto disable_reg_clk;
		}
	}

	gpiod_set_value_cansleep(ov5695->reset_gpio, 0);

	usleep_range(1000, 1200);

	return 0;

disable_reg_clk:
	for (--i; i >= 0; i--)
		regulator_disable(ov5695->supplies[i].consumer);
	clk_disable_unprepare(ov5695->xvclk);

	return ret;
}

static void __ov5695_power_off(struct ov5695 *ov5695)
{
	struct device *dev = &ov5695->client->dev;
	int i, ret;

	clk_disable_unprepare(ov5695->xvclk);
	gpiod_set_value_cansleep(ov5695->reset_gpio, 1);

	/*
	 * The hardware requires the regulators to be powered off in order,
	 * so disable them one by one.
	 */
	for (i = OV5695_NUM_SUPPLIES - 1; i >= 0; i--) {
		ret = regulator_disable(ov5695->supplies[i].consumer);
		if (ret)
			dev_err(dev, "Failed to disable %s: %d\n",
				ov5695->supplies[i].supply, ret);
	}
}

static int __maybe_unused ov5695_runtime_resume(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct ov5695 *ov5695 = to_ov5695(sd);

	return __ov5695_power_on(ov5695);
}

static int __maybe_unused ov5695_runtime_suspend(struct device *dev)
{
	struct v4l2_subdev *sd = dev_get_drvdata(dev);
	struct ov5695 *ov5695 = to_ov5695(sd);

	__ov5695_power_off(ov5695);

	return 0;
}

static int ov5695_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	struct ov5695 *ov5695 = to_ov5695(sd);
	struct v4l2_mbus_framefmt *try_fmt =
				v4l2_subdev_state_get_format(fh->state, 0);
	const struct ov5695_mode *def_mode = &supported_modes[0];

	mutex_lock(&ov5695->mutex);
	/* Initialize try_fmt */
	try_fmt->width = def_mode->width;
	try_fmt->height = def_mode->height;
	try_fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
	try_fmt->field = V4L2_FIELD_NONE;

	mutex_unlock(&ov5695->mutex);
	/* No crop or compose */

	return 0;
}

static const struct dev_pm_ops ov5695_pm_ops = {
	SET_RUNTIME_PM_OPS(ov5695_runtime_suspend,
			   ov5695_runtime_resume, NULL)
};

static const struct v4l2_subdev_internal_ops ov5695_internal_ops = {
	.open = ov5695_open,
};

static const struct v4l2_subdev_video_ops ov5695_video_ops = {
	.s_stream = ov5695_s_stream,
};

static const struct v4l2_subdev_pad_ops ov5695_pad_ops = {
	.enum_mbus_code = ov5695_enum_mbus_code,
	.enum_frame_size = ov5695_enum_frame_sizes,
	.get_fmt = ov5695_get_fmt,
	.set_fmt = ov5695_set_fmt,
};

static const struct v4l2_subdev_ops ov5695_subdev_ops = {
	.video	= &ov5695_video_ops,
	.pad	= &ov5695_pad_ops,
};

static int ov5695_set_ctrl(struct v4l2_ctrl *ctrl)
{
	struct ov5695 *ov5695 = container_of(ctrl->handler,
					     struct ov5695, ctrl_handler);
	struct i2c_client *client = ov5695->client;
	s64 max;
	int ret = 0;

	/* Propagate change of current control to all related controls */
	switch (ctrl->id) {
	case V4L2_CID_VBLANK:
		/* Update max exposure while meeting expected vblanking */
		max = ov5695->cur_mode->height + ctrl->val - 4;
		__v4l2_ctrl_modify_range(ov5695->exposure,
					 ov5695->exposure->minimum, max,
					 ov5695->exposure->step,
					 ov5695->exposure->default_value);
		break;
	}

	if (!pm_runtime_get_if_in_use(&client->dev))
		return 0;

	switch (ctrl->id) {
	case V4L2_CID_EXPOSURE:
		/* 4 least significant bits of exposure are fractional part */
		ret = ov5695_write_reg(ov5695->client, OV5695_REG_EXPOSURE,
				       OV5695_REG_VALUE_24BIT, ctrl->val << 4);
		break;
	case V4L2_CID_ANALOGUE_GAIN:
		ret = ov5695_write_reg(ov5695->client, OV5695_REG_ANALOG_GAIN,
				       OV5695_REG_VALUE_08BIT, ctrl->val);
		break;
	case V4L2_CID_DIGITAL_GAIN:
		ret = ov5695_write_reg(ov5695->client, OV5695_REG_DIGI_GAIN_L,
				       OV5695_REG_VALUE_08BIT,
				       ctrl->val & OV5695_DIGI_GAIN_L_MASK);
		ret = ov5695_write_reg(ov5695->client, OV5695_REG_DIGI_GAIN_H,
				       OV5695_REG_VALUE_08BIT,
				       ctrl->val >> OV5695_DIGI_GAIN_H_SHIFT);
		break;
	case V4L2_CID_VBLANK:
		ret = ov5695_write_reg(ov5695->client, OV5695_REG_VTS,
				       OV5695_REG_VALUE_16BIT,
				       ctrl->val + ov5695->cur_mode->height);
		break;
	case V4L2_CID_TEST_PATTERN:
		ret = ov5695_enable_test_pattern(ov5695, ctrl->val);
		break;
	default:
		dev_warn(&client->dev, "%s Unhandled id:0x%x, val:0x%x\n",
			 __func__, ctrl->id, ctrl->val);
		break;
	}

	pm_runtime_put(&client->dev);

	return ret;
}

static const struct v4l2_ctrl_ops ov5695_ctrl_ops = {
	.s_ctrl = ov5695_set_ctrl,
};

static int ov5695_initialize_controls(struct ov5695 *ov5695)
{
	const struct ov5695_mode *mode;
	struct v4l2_ctrl_handler *handler;
	struct v4l2_ctrl *ctrl;
	s64 exposure_max, vblank_def;
	u32 h_blank;
	int ret;

	handler = &ov5695->ctrl_handler;
	mode = ov5695->cur_mode;
	ret = v4l2_ctrl_handler_init(handler, 8);
	if (ret)
		return ret;
	handler->lock = &ov5695->mutex;

	ctrl = v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
				      0, 0, link_freq_menu_items);
	if (ctrl)
		ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE,
			  0, OV5695_PIXEL_RATE, 1, OV5695_PIXEL_RATE);

	h_blank = mode->hts_def - mode->width;
	ov5695->hblank = v4l2_ctrl_new_std(handler, NULL, V4L2_CID_HBLANK,
				h_blank, h_blank, 1, h_blank);
	if (ov5695->hblank)
		ov5695->hblank->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	vblank_def = mode->vts_def - mode->height;
	ov5695->vblank = v4l2_ctrl_new_std(handler, &ov5695_ctrl_ops,
				V4L2_CID_VBLANK, vblank_def,
				OV5695_VTS_MAX - mode->height,
				1, vblank_def);

	exposure_max = mode->vts_def - 4;
	ov5695->exposure = v4l2_ctrl_new_std(handler, &ov5695_ctrl_ops,
				V4L2_CID_EXPOSURE, OV5695_EXPOSURE_MIN,
				exposure_max, OV5695_EXPOSURE_STEP,
				mode->exp_def);

	ov5695->anal_gain = v4l2_ctrl_new_std(handler, &ov5695_ctrl_ops,
				V4L2_CID_ANALOGUE_GAIN, ANALOG_GAIN_MIN,
				ANALOG_GAIN_MAX, ANALOG_GAIN_STEP,
				ANALOG_GAIN_DEFAULT);

	/* Digital gain */
	ov5695->digi_gain = v4l2_ctrl_new_std(handler, &ov5695_ctrl_ops,
				V4L2_CID_DIGITAL_GAIN, OV5695_DIGI_GAIN_MIN,
				OV5695_DIGI_GAIN_MAX, OV5695_DIGI_GAIN_STEP,
				OV5695_DIGI_GAIN_DEFAULT);

	ov5695->test_pattern = v4l2_ctrl_new_std_menu_items(handler,
				&ov5695_ctrl_ops, V4L2_CID_TEST_PATTERN,
				ARRAY_SIZE(ov5695_test_pattern_menu) - 1,
				0, 0, ov5695_test_pattern_menu);

	if (handler->error) {
		ret = handler->error;
		dev_err(&ov5695->client->dev,
			"Failed to init controls(%d)\n", ret);
		goto err_free_handler;
	}

	ov5695->subdev.ctrl_handler = handler;

	return 0;

err_free_handler:
	v4l2_ctrl_handler_free(handler);

	return ret;
}

static int ov5695_check_sensor_id(struct ov5695 *ov5695,
				  struct i2c_client *client)
{
	struct device *dev = &ov5695->client->dev;
	u32 id = 0;
	int ret;

	ret = ov5695_read_reg(client, OV5695_REG_CHIP_ID,
			      OV5695_REG_VALUE_24BIT, &id);
	if (id != CHIP_ID) {
		dev_err(dev, "Unexpected sensor id(%06x), ret(%d)\n", id, ret);
		return ret;
	}

	dev_info(dev, "Detected OV%06x sensor\n", CHIP_ID);

	return 0;
}

static int ov5695_configure_regulators(struct ov5695 *ov5695)
{
	int i;

	for (i = 0; i < OV5695_NUM_SUPPLIES; i++)
		ov5695->supplies[i].supply = ov5695_supply_names[i];

	return devm_regulator_bulk_get(&ov5695->client->dev,
				       OV5695_NUM_SUPPLIES,
				       ov5695->supplies);
}

static int ov5695_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct ov5695 *ov5695;
	struct v4l2_subdev *sd;
	int ret;

	ov5695 = devm_kzalloc(dev, sizeof(*ov5695), GFP_KERNEL);
	if (!ov5695)
		return -ENOMEM;

	ov5695->client = client;
	ov5695->cur_mode = &supported_modes[0];

	ov5695->xvclk = devm_clk_get(dev, "xvclk");
	if (IS_ERR(ov5695->xvclk)) {
		dev_err(dev, "Failed to get xvclk\n");
		return -EINVAL;
	}
	ret = clk_set_rate(ov5695->xvclk, OV5695_XVCLK_FREQ);
	if (ret < 0) {
		dev_err(dev, "Failed to set xvclk rate (24MHz)\n");
		return ret;
	}
	if (clk_get_rate(ov5695->xvclk) != OV5695_XVCLK_FREQ)
		dev_warn(dev, "xvclk mismatched, modes are based on 24MHz\n");

	ov5695->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(ov5695->reset_gpio)) {
		dev_err(dev, "Failed to get reset-gpios\n");
		return -EINVAL;
	}

	ret = ov5695_configure_regulators(ov5695);
	if (ret) {
		dev_err(dev, "Failed to get power regulators\n");
		return ret;
	}

	mutex_init(&ov5695->mutex);

	sd = &ov5695->subdev;
	v4l2_i2c_subdev_init(sd, client, &ov5695_subdev_ops);
	ret = ov5695_initialize_controls(ov5695);
	if (ret)
		goto err_destroy_mutex;

	ret = __ov5695_power_on(ov5695);
	if (ret)
		goto err_free_handler;

	ret = ov5695_check_sensor_id(ov5695, client);
	if (ret)
		goto err_power_off;

	sd->internal_ops = &ov5695_internal_ops;
	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	ov5695->pad.flags = MEDIA_PAD_FL_SOURCE;
	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
	ret = media_entity_pads_init(&sd->entity, 1, &ov5695->pad);
	if (ret < 0)
		goto err_power_off;

	ret = v4l2_async_register_subdev_sensor(sd);
	if (ret) {
		dev_err(dev, "v4l2 async register subdev failed\n");
		goto err_clean_entity;
	}

	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);
	pm_runtime_idle(dev);

	return 0;

err_clean_entity:
	media_entity_cleanup(&sd->entity);
err_power_off:
	__ov5695_power_off(ov5695);
err_free_handler:
	v4l2_ctrl_handler_free(&ov5695->ctrl_handler);
err_destroy_mutex:
	mutex_destroy(&ov5695->mutex);

	return ret;
}

static void ov5695_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov5695 *ov5695 = to_ov5695(sd);

	v4l2_async_unregister_subdev(sd);
	media_entity_cleanup(&sd->entity);
	v4l2_ctrl_handler_free(&ov5695->ctrl_handler);
	mutex_destroy(&ov5695->mutex);

	pm_runtime_disable(&client->dev);
	if (!pm_runtime_status_suspended(&client->dev))
		__ov5695_power_off(ov5695);
	pm_runtime_set_suspended(&client->dev);
}

#if IS_ENABLED(CONFIG_OF)
static const struct of_device_id ov5695_of_match[] = {
	{ .compatible = "ovti,ov5695" },
	{},
};
MODULE_DEVICE_TABLE(of, ov5695_of_match);
#endif

static struct i2c_driver ov5695_i2c_driver = {
	.driver = {
		.name = "ov5695",
		.pm = &ov5695_pm_ops,
		.of_match_table = of_match_ptr(ov5695_of_match),
	},
	.probe		= ov5695_probe,
	.remove		= ov5695_remove,
};

module_i2c_driver(ov5695_i2c_driver);

MODULE_DESCRIPTION("OmniVision ov5695 sensor driver");
MODULE_LICENSE("GPL v2");