// SPDX-License-Identifier: GPL-2.0-only
/*
 * Omnivision OV2659 CMOS Image Sensor driver
 *
 * Copyright (C) 2015 Texas Instruments, Inc.
 *
 * Benoit Parrot <bparrot@ti.com>
 * Lad, Prabhakar <prabhakar.csengg@gmail.com>
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/pm_runtime.h>

#include <media/i2c/ov2659.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-image-sizes.h>
#include <media/v4l2-subdev.h>

#define DRIVER_NAME "ov2659"

/*
 * OV2659 register definitions
 */
#define REG_SOFTWARE_STANDBY		0x0100
#define REG_SOFTWARE_RESET		0x0103
#define REG_IO_CTRL00			0x3000
#define REG_IO_CTRL01			0x3001
#define REG_IO_CTRL02			0x3002
#define REG_OUTPUT_VALUE00		0x3008
#define REG_OUTPUT_VALUE01		0x3009
#define REG_OUTPUT_VALUE02		0x300d
#define REG_OUTPUT_SELECT00		0x300e
#define REG_OUTPUT_SELECT01		0x300f
#define REG_OUTPUT_SELECT02		0x3010
#define REG_OUTPUT_DRIVE		0x3011
#define REG_INPUT_READOUT00		0x302d
#define REG_INPUT_READOUT01		0x302e
#define REG_INPUT_READOUT02		0x302f

#define REG_SC_PLL_CTRL0		0x3003
#define REG_SC_PLL_CTRL1		0x3004
#define REG_SC_PLL_CTRL2		0x3005
#define REG_SC_PLL_CTRL3		0x3006
#define REG_SC_CHIP_ID_H		0x300a
#define REG_SC_CHIP_ID_L		0x300b
#define REG_SC_PWC			0x3014
#define REG_SC_CLKRST0			0x301a
#define REG_SC_CLKRST1			0x301b
#define REG_SC_CLKRST2			0x301c
#define REG_SC_CLKRST3			0x301d
#define REG_SC_SUB_ID			0x302a
#define REG_SC_SCCB_ID			0x302b

#define REG_GROUP_ADDRESS_00		0x3200
#define REG_GROUP_ADDRESS_01		0x3201
#define REG_GROUP_ADDRESS_02		0x3202
#define REG_GROUP_ADDRESS_03		0x3203
#define REG_GROUP_ACCESS		0x3208

#define REG_AWB_R_GAIN_H		0x3400
#define REG_AWB_R_GAIN_L		0x3401
#define REG_AWB_G_GAIN_H		0x3402
#define REG_AWB_G_GAIN_L		0x3403
#define REG_AWB_B_GAIN_H		0x3404
#define REG_AWB_B_GAIN_L		0x3405
#define REG_AWB_MANUAL_CONTROL		0x3406

#define REG_TIMING_HS_H			0x3800
#define REG_TIMING_HS_L			0x3801
#define REG_TIMING_VS_H			0x3802
#define REG_TIMING_VS_L			0x3803
#define REG_TIMING_HW_H			0x3804
#define REG_TIMING_HW_L			0x3805
#define REG_TIMING_VH_H			0x3806
#define REG_TIMING_VH_L			0x3807
#define REG_TIMING_DVPHO_H		0x3808
#define REG_TIMING_DVPHO_L		0x3809
#define REG_TIMING_DVPVO_H		0x380a
#define REG_TIMING_DVPVO_L		0x380b
#define REG_TIMING_HTS_H		0x380c
#define REG_TIMING_HTS_L		0x380d
#define REG_TIMING_VTS_H		0x380e
#define REG_TIMING_VTS_L		0x380f
#define REG_TIMING_HOFFS_H		0x3810
#define REG_TIMING_HOFFS_L		0x3811
#define REG_TIMING_VOFFS_H		0x3812
#define REG_TIMING_VOFFS_L		0x3813
#define REG_TIMING_XINC			0x3814
#define REG_TIMING_YINC			0x3815
#define REG_TIMING_VERT_FORMAT		0x3820
#define REG_TIMING_HORIZ_FORMAT		0x3821

#define REG_FORMAT_CTRL00		0x4300

#define REG_VFIFO_READ_START_H		0x4608
#define REG_VFIFO_READ_START_L		0x4609

#define REG_DVP_CTRL02			0x4708

#define REG_ISP_CTRL00			0x5000
#define REG_ISP_CTRL01			0x5001
#define REG_ISP_CTRL02			0x5002

#define REG_LENC_RED_X0_H		0x500c
#define REG_LENC_RED_X0_L		0x500d
#define REG_LENC_RED_Y0_H		0x500e
#define REG_LENC_RED_Y0_L		0x500f
#define REG_LENC_RED_A1			0x5010
#define REG_LENC_RED_B1			0x5011
#define REG_LENC_RED_A2_B2		0x5012
#define REG_LENC_GREEN_X0_H		0x5013
#define REG_LENC_GREEN_X0_L		0x5014
#define REG_LENC_GREEN_Y0_H		0x5015
#define REG_LENC_GREEN_Y0_L		0x5016
#define REG_LENC_GREEN_A1		0x5017
#define REG_LENC_GREEN_B1		0x5018
#define REG_LENC_GREEN_A2_B2		0x5019
#define REG_LENC_BLUE_X0_H		0x501a
#define REG_LENC_BLUE_X0_L		0x501b
#define REG_LENC_BLUE_Y0_H		0x501c
#define REG_LENC_BLUE_Y0_L		0x501d
#define REG_LENC_BLUE_A1		0x501e
#define REG_LENC_BLUE_B1		0x501f
#define REG_LENC_BLUE_A2_B2		0x5020

#define REG_AWB_CTRL00			0x5035
#define REG_AWB_CTRL01			0x5036
#define REG_AWB_CTRL02			0x5037
#define REG_AWB_CTRL03			0x5038
#define REG_AWB_CTRL04			0x5039
#define REG_AWB_LOCAL_LIMIT		0x503a
#define REG_AWB_CTRL12			0x5049
#define REG_AWB_CTRL13			0x504a
#define REG_AWB_CTRL14			0x504b

#define REG_SHARPENMT_THRESH1		0x5064
#define REG_SHARPENMT_THRESH2		0x5065
#define REG_SHARPENMT_OFFSET1		0x5066
#define REG_SHARPENMT_OFFSET2		0x5067
#define REG_DENOISE_THRESH1		0x5068
#define REG_DENOISE_THRESH2		0x5069
#define REG_DENOISE_OFFSET1		0x506a
#define REG_DENOISE_OFFSET2		0x506b
#define REG_SHARPEN_THRESH1		0x506c
#define REG_SHARPEN_THRESH2		0x506d
#define REG_CIP_CTRL00			0x506e
#define REG_CIP_CTRL01			0x506f

#define REG_CMX_SIGN			0x5079
#define REG_CMX_MISC_CTRL		0x507a

#define REG_PRE_ISP_CTRL00		0x50a0
#define TEST_PATTERN_ENABLE		BIT(7)
#define VERTICAL_COLOR_BAR_MASK		0x53

#define REG_NULL			0x0000	/* Array end token */

#define OV265X_ID(_msb, _lsb)		((_msb) << 8 | (_lsb))
#define OV2659_ID			0x2656

struct sensor_register {
	u16 addr;
	u8 value;
};

struct ov2659_framesize {
	u16 width;
	u16 height;
	u16 max_exp_lines;
	const struct sensor_register *regs;
};

struct ov2659_pll_ctrl {
	u8 ctrl1;
	u8 ctrl2;
	u8 ctrl3;
};

struct ov2659_pixfmt {
	u32 code;
	/* Output format Register Value (REG_FORMAT_CTRL00) */
	struct sensor_register *format_ctrl_regs;
};

struct pll_ctrl_reg {
	unsigned int div;
	unsigned char reg;
};

struct ov2659 {
	struct v4l2_subdev sd;
	struct media_pad pad;
	struct v4l2_mbus_framefmt format;
	unsigned int xvclk_frequency;
	const struct ov2659_platform_data *pdata;
	struct mutex lock;
	struct i2c_client *client;
	struct v4l2_ctrl_handler ctrls;
	struct v4l2_ctrl *link_frequency;
	struct clk *clk;
	const struct ov2659_framesize *frame_size;
	struct sensor_register *format_ctrl_regs;
	struct ov2659_pll_ctrl pll;
	int streaming;
	/* used to control the sensor PWDN pin */
	struct gpio_desc *pwdn_gpio;
	/* used to control the sensor RESETB pin */
	struct gpio_desc *resetb_gpio;
};

static const struct sensor_register ov2659_init_regs[] = {
	{ REG_IO_CTRL00, 0x03 },
	{ REG_IO_CTRL01, 0xff },
	{ REG_IO_CTRL02, 0xe0 },
	{ 0x3633, 0x3d },
	{ 0x3620, 0x02 },
	{ 0x3631, 0x11 },
	{ 0x3612, 0x04 },
	{ 0x3630, 0x20 },
	{ 0x4702, 0x02 },
	{ 0x370c, 0x34 },
	{ REG_TIMING_HS_H, 0x00 },
	{ REG_TIMING_HS_L, 0x00 },
	{ REG_TIMING_VS_H, 0x00 },
	{ REG_TIMING_VS_L, 0x00 },
	{ REG_TIMING_HW_H, 0x06 },
	{ REG_TIMING_HW_L, 0x5f },
	{ REG_TIMING_VH_H, 0x04 },
	{ REG_TIMING_VH_L, 0xb7 },
	{ REG_TIMING_DVPHO_H, 0x03 },
	{ REG_TIMING_DVPHO_L, 0x20 },
	{ REG_TIMING_DVPVO_H, 0x02 },
	{ REG_TIMING_DVPVO_L, 0x58 },
	{ REG_TIMING_HTS_H, 0x05 },
	{ REG_TIMING_HTS_L, 0x14 },
	{ REG_TIMING_VTS_H, 0x02 },
	{ REG_TIMING_VTS_L, 0x68 },
	{ REG_TIMING_HOFFS_L, 0x08 },
	{ REG_TIMING_VOFFS_L, 0x02 },
	{ REG_TIMING_XINC, 0x31 },
	{ REG_TIMING_YINC, 0x31 },
	{ 0x3a02, 0x02 },
	{ 0x3a03, 0x68 },
	{ 0x3a08, 0x00 },
	{ 0x3a09, 0x5c },
	{ 0x3a0a, 0x00 },
	{ 0x3a0b, 0x4d },
	{ 0x3a0d, 0x08 },
	{ 0x3a0e, 0x06 },
	{ 0x3a14, 0x02 },
	{ 0x3a15, 0x28 },
	{ REG_DVP_CTRL02, 0x01 },
	{ 0x3623, 0x00 },
	{ 0x3634, 0x76 },
	{ 0x3701, 0x44 },
	{ 0x3702, 0x18 },
	{ 0x3703, 0x24 },
	{ 0x3704, 0x24 },
	{ 0x3705, 0x0c },
	{ REG_TIMING_VERT_FORMAT, 0x81 },
	{ REG_TIMING_HORIZ_FORMAT, 0x01 },
	{ 0x370a, 0x52 },
	{ REG_VFIFO_READ_START_H, 0x00 },
	{ REG_VFIFO_READ_START_L, 0x80 },
	{ REG_FORMAT_CTRL00, 0x30 },
	{ 0x5086, 0x02 },
	{ REG_ISP_CTRL00, 0xfb },
	{ REG_ISP_CTRL01, 0x1f },
	{ REG_ISP_CTRL02, 0x00 },
	{ 0x5025, 0x0e },
	{ 0x5026, 0x18 },
	{ 0x5027, 0x34 },
	{ 0x5028, 0x4c },
	{ 0x5029, 0x62 },
	{ 0x502a, 0x74 },
	{ 0x502b, 0x85 },
	{ 0x502c, 0x92 },
	{ 0x502d, 0x9e },
	{ 0x502e, 0xb2 },
	{ 0x502f, 0xc0 },
	{ 0x5030, 0xcc },
	{ 0x5031, 0xe0 },
	{ 0x5032, 0xee },
	{ 0x5033, 0xf6 },
	{ 0x5034, 0x11 },
	{ 0x5070, 0x1c },
	{ 0x5071, 0x5b },
	{ 0x5072, 0x05 },
	{ 0x5073, 0x20 },
	{ 0x5074, 0x94 },
	{ 0x5075, 0xb4 },
	{ 0x5076, 0xb4 },
	{ 0x5077, 0xaf },
	{ 0x5078, 0x05 },
	{ REG_CMX_SIGN, 0x98 },
	{ REG_CMX_MISC_CTRL, 0x21 },
	{ REG_AWB_CTRL00, 0x6a },
	{ REG_AWB_CTRL01, 0x11 },
	{ REG_AWB_CTRL02, 0x92 },
	{ REG_AWB_CTRL03, 0x21 },
	{ REG_AWB_CTRL04, 0xe1 },
	{ REG_AWB_LOCAL_LIMIT, 0x01 },
	{ 0x503c, 0x05 },
	{ 0x503d, 0x08 },
	{ 0x503e, 0x08 },
	{ 0x503f, 0x64 },
	{ 0x5040, 0x58 },
	{ 0x5041, 0x2a },
	{ 0x5042, 0xc5 },
	{ 0x5043, 0x2e },
	{ 0x5044, 0x3a },
	{ 0x5045, 0x3c },
	{ 0x5046, 0x44 },
	{ 0x5047, 0xf8 },
	{ 0x5048, 0x08 },
	{ REG_AWB_CTRL12, 0x70 },
	{ REG_AWB_CTRL13, 0xf0 },
	{ REG_AWB_CTRL14, 0xf0 },
	{ REG_LENC_RED_X0_H, 0x03 },
	{ REG_LENC_RED_X0_L, 0x20 },
	{ REG_LENC_RED_Y0_H, 0x02 },
	{ REG_LENC_RED_Y0_L, 0x5c },
	{ REG_LENC_RED_A1, 0x48 },
	{ REG_LENC_RED_B1, 0x00 },
	{ REG_LENC_RED_A2_B2, 0x66 },
	{ REG_LENC_GREEN_X0_H, 0x03 },
	{ REG_LENC_GREEN_X0_L, 0x30 },
	{ REG_LENC_GREEN_Y0_H, 0x02 },
	{ REG_LENC_GREEN_Y0_L, 0x7c },
	{ REG_LENC_GREEN_A1, 0x40 },
	{ REG_LENC_GREEN_B1, 0x00 },
	{ REG_LENC_GREEN_A2_B2, 0x66 },
	{ REG_LENC_BLUE_X0_H, 0x03 },
	{ REG_LENC_BLUE_X0_L, 0x10 },
	{ REG_LENC_BLUE_Y0_H, 0x02 },
	{ REG_LENC_BLUE_Y0_L, 0x7c },
	{ REG_LENC_BLUE_A1, 0x3a },
	{ REG_LENC_BLUE_B1, 0x00 },
	{ REG_LENC_BLUE_A2_B2, 0x66 },
	{ REG_CIP_CTRL00, 0x44 },
	{ REG_SHARPENMT_THRESH1, 0x08 },
	{ REG_SHARPENMT_THRESH2, 0x10 },
	{ REG_SHARPENMT_OFFSET1, 0x12 },
	{ REG_SHARPENMT_OFFSET2, 0x02 },
	{ REG_SHARPEN_THRESH1, 0x08 },
	{ REG_SHARPEN_THRESH2, 0x10 },
	{ REG_CIP_CTRL01, 0xa6 },
	{ REG_DENOISE_THRESH1, 0x08 },
	{ REG_DENOISE_THRESH2, 0x10 },
	{ REG_DENOISE_OFFSET1, 0x04 },
	{ REG_DENOISE_OFFSET2, 0x12 },
	{ 0x507e, 0x40 },
	{ 0x507f, 0x20 },
	{ 0x507b, 0x02 },
	{ REG_CMX_MISC_CTRL, 0x01 },
	{ 0x5084, 0x0c },
	{ 0x5085, 0x3e },
	{ 0x5005, 0x80 },
	{ 0x3a0f, 0x30 },
	{ 0x3a10, 0x28 },
	{ 0x3a1b, 0x32 },
	{ 0x3a1e, 0x26 },
	{ 0x3a11, 0x60 },
	{ 0x3a1f, 0x14 },
	{ 0x5060, 0x69 },
	{ 0x5061, 0x7d },
	{ 0x5062, 0x7d },
	{ 0x5063, 0x69 },
	{ REG_NULL, 0x00 },
};

/* 1280X720 720p */
static struct sensor_register ov2659_720p[] = {
	{ REG_TIMING_HS_H, 0x00 },
	{ REG_TIMING_HS_L, 0xa0 },
	{ REG_TIMING_VS_H, 0x00 },
	{ REG_TIMING_VS_L, 0xf0 },
	{ REG_TIMING_HW_H, 0x05 },
	{ REG_TIMING_HW_L, 0xbf },
	{ REG_TIMING_VH_H, 0x03 },
	{ REG_TIMING_VH_L, 0xcb },
	{ REG_TIMING_DVPHO_H, 0x05 },
	{ REG_TIMING_DVPHO_L, 0x00 },
	{ REG_TIMING_DVPVO_H, 0x02 },
	{ REG_TIMING_DVPVO_L, 0xd0 },
	{ REG_TIMING_HTS_H, 0x06 },
	{ REG_TIMING_HTS_L, 0x4c },
	{ REG_TIMING_VTS_H, 0x02 },
	{ REG_TIMING_VTS_L, 0xe8 },
	{ REG_TIMING_HOFFS_L, 0x10 },
	{ REG_TIMING_VOFFS_L, 0x06 },
	{ REG_TIMING_XINC, 0x11 },
	{ REG_TIMING_YINC, 0x11 },
	{ REG_TIMING_VERT_FORMAT, 0x80 },
	{ REG_TIMING_HORIZ_FORMAT, 0x00 },
	{ 0x370a, 0x12 },
	{ 0x3a03, 0xe8 },
	{ 0x3a09, 0x6f },
	{ 0x3a0b, 0x5d },
	{ 0x3a15, 0x9a },
	{ REG_VFIFO_READ_START_H, 0x00 },
	{ REG_VFIFO_READ_START_L, 0x80 },
	{ REG_ISP_CTRL02, 0x00 },
	{ REG_NULL, 0x00 },
};

/* 1600X1200 UXGA */
static struct sensor_register ov2659_uxga[] = {
	{ REG_TIMING_HS_H, 0x00 },
	{ REG_TIMING_HS_L, 0x00 },
	{ REG_TIMING_VS_H, 0x00 },
	{ REG_TIMING_VS_L, 0x00 },
	{ REG_TIMING_HW_H, 0x06 },
	{ REG_TIMING_HW_L, 0x5f },
	{ REG_TIMING_VH_H, 0x04 },
	{ REG_TIMING_VH_L, 0xbb },
	{ REG_TIMING_DVPHO_H, 0x06 },
	{ REG_TIMING_DVPHO_L, 0x40 },
	{ REG_TIMING_DVPVO_H, 0x04 },
	{ REG_TIMING_DVPVO_L, 0xb0 },
	{ REG_TIMING_HTS_H, 0x07 },
	{ REG_TIMING_HTS_L, 0x9f },
	{ REG_TIMING_VTS_H, 0x04 },
	{ REG_TIMING_VTS_L, 0xd0 },
	{ REG_TIMING_HOFFS_L, 0x10 },
	{ REG_TIMING_VOFFS_L, 0x06 },
	{ REG_TIMING_XINC, 0x11 },
	{ REG_TIMING_YINC, 0x11 },
	{ 0x3a02, 0x04 },
	{ 0x3a03, 0xd0 },
	{ 0x3a08, 0x00 },
	{ 0x3a09, 0xb8 },
	{ 0x3a0a, 0x00 },
	{ 0x3a0b, 0x9a },
	{ 0x3a0d, 0x08 },
	{ 0x3a0e, 0x06 },
	{ 0x3a14, 0x04 },
	{ 0x3a15, 0x50 },
	{ 0x3623, 0x00 },
	{ 0x3634, 0x44 },
	{ 0x3701, 0x44 },
	{ 0x3702, 0x30 },
	{ 0x3703, 0x48 },
	{ 0x3704, 0x48 },
	{ 0x3705, 0x18 },
	{ REG_TIMING_VERT_FORMAT, 0x80 },
	{ REG_TIMING_HORIZ_FORMAT, 0x00 },
	{ 0x370a, 0x12 },
	{ REG_VFIFO_READ_START_H, 0x00 },
	{ REG_VFIFO_READ_START_L, 0x80 },
	{ REG_ISP_CTRL02, 0x00 },
	{ REG_NULL, 0x00 },
};

/* 1280X1024 SXGA */
static struct sensor_register ov2659_sxga[] = {
	{ REG_TIMING_HS_H, 0x00 },
	{ REG_TIMING_HS_L, 0x00 },
	{ REG_TIMING_VS_H, 0x00 },
	{ REG_TIMING_VS_L, 0x00 },
	{ REG_TIMING_HW_H, 0x06 },
	{ REG_TIMING_HW_L, 0x5f },
	{ REG_TIMING_VH_H, 0x04 },
	{ REG_TIMING_VH_L, 0xb7 },
	{ REG_TIMING_DVPHO_H, 0x05 },
	{ REG_TIMING_DVPHO_L, 0x00 },
	{ REG_TIMING_DVPVO_H, 0x04 },
	{ REG_TIMING_DVPVO_L, 0x00 },
	{ REG_TIMING_HTS_H, 0x07 },
	{ REG_TIMING_HTS_L, 0x9c },
	{ REG_TIMING_VTS_H, 0x04 },
	{ REG_TIMING_VTS_L, 0xd0 },
	{ REG_TIMING_HOFFS_L, 0x10 },
	{ REG_TIMING_VOFFS_L, 0x06 },
	{ REG_TIMING_XINC, 0x11 },
	{ REG_TIMING_YINC, 0x11 },
	{ 0x3a02, 0x02 },
	{ 0x3a03, 0x68 },
	{ 0x3a08, 0x00 },
	{ 0x3a09, 0x5c },
	{ 0x3a0a, 0x00 },
	{ 0x3a0b, 0x4d },
	{ 0x3a0d, 0x08 },
	{ 0x3a0e, 0x06 },
	{ 0x3a14, 0x02 },
	{ 0x3a15, 0x28 },
	{ 0x3623, 0x00 },
	{ 0x3634, 0x76 },
	{ 0x3701, 0x44 },
	{ 0x3702, 0x18 },
	{ 0x3703, 0x24 },
	{ 0x3704, 0x24 },
	{ 0x3705, 0x0c },
	{ REG_TIMING_VERT_FORMAT, 0x80 },
	{ REG_TIMING_HORIZ_FORMAT, 0x00 },
	{ 0x370a, 0x52 },
	{ REG_VFIFO_READ_START_H, 0x00 },
	{ REG_VFIFO_READ_START_L, 0x80 },
	{ REG_ISP_CTRL02, 0x00 },
	{ REG_NULL, 0x00 },
};

/* 1024X768 SXGA */
static struct sensor_register ov2659_xga[] = {
	{ REG_TIMING_HS_H, 0x00 },
	{ REG_TIMING_HS_L, 0x00 },
	{ REG_TIMING_VS_H, 0x00 },
	{ REG_TIMING_VS_L, 0x00 },
	{ REG_TIMING_HW_H, 0x06 },
	{ REG_TIMING_HW_L, 0x5f },
	{ REG_TIMING_VH_H, 0x04 },
	{ REG_TIMING_VH_L, 0xb7 },
	{ REG_TIMING_DVPHO_H, 0x04 },
	{ REG_TIMING_DVPHO_L, 0x00 },
	{ REG_TIMING_DVPVO_H, 0x03 },
	{ REG_TIMING_DVPVO_L, 0x00 },
	{ REG_TIMING_HTS_H, 0x07 },
	{ REG_TIMING_HTS_L, 0x9c },
	{ REG_TIMING_VTS_H, 0x04 },
	{ REG_TIMING_VTS_L, 0xd0 },
	{ REG_TIMING_HOFFS_L, 0x10 },
	{ REG_TIMING_VOFFS_L, 0x06 },
	{ REG_TIMING_XINC, 0x11 },
	{ REG_TIMING_YINC, 0x11 },
	{ 0x3a02, 0x02 },
	{ 0x3a03, 0x68 },
	{ 0x3a08, 0x00 },
	{ 0x3a09, 0x5c },
	{ 0x3a0a, 0x00 },
	{ 0x3a0b, 0x4d },
	{ 0x3a0d, 0x08 },
	{ 0x3a0e, 0x06 },
	{ 0x3a14, 0x02 },
	{ 0x3a15, 0x28 },
	{ 0x3623, 0x00 },
	{ 0x3634, 0x76 },
	{ 0x3701, 0x44 },
	{ 0x3702, 0x18 },
	{ 0x3703, 0x24 },
	{ 0x3704, 0x24 },
	{ 0x3705, 0x0c },
	{ REG_TIMING_VERT_FORMAT, 0x80 },
	{ REG_TIMING_HORIZ_FORMAT, 0x00 },
	{ 0x370a, 0x52 },
	{ REG_VFIFO_READ_START_H, 0x00 },
	{ REG_VFIFO_READ_START_L, 0x80 },
	{ REG_ISP_CTRL02, 0x00 },
	{ REG_NULL, 0x00 },
};

/* 800X600 SVGA */
static struct sensor_register ov2659_svga[] = {
	{ REG_TIMING_HS_H, 0x00 },
	{ REG_TIMING_HS_L, 0x00 },
	{ REG_TIMING_VS_H, 0x00 },
	{ REG_TIMING_VS_L, 0x00 },
	{ REG_TIMING_HW_H, 0x06 },
	{ REG_TIMING_HW_L, 0x5f },
	{ REG_TIMING_VH_H, 0x04 },
	{ REG_TIMING_VH_L, 0xb7 },
	{ REG_TIMING_DVPHO_H, 0x03 },
	{ REG_TIMING_DVPHO_L, 0x20 },
	{ REG_TIMING_DVPVO_H, 0x02 },
	{ REG_TIMING_DVPVO_L, 0x58 },
	{ REG_TIMING_HTS_H, 0x05 },
	{ REG_TIMING_HTS_L, 0x14 },
	{ REG_TIMING_VTS_H, 0x02 },
	{ REG_TIMING_VTS_L, 0x68 },
	{ REG_TIMING_HOFFS_L, 0x08 },
	{ REG_TIMING_VOFFS_L, 0x02 },
	{ REG_TIMING_XINC, 0x31 },
	{ REG_TIMING_YINC, 0x31 },
	{ 0x3a02, 0x02 },
	{ 0x3a03, 0x68 },
	{ 0x3a08, 0x00 },
	{ 0x3a09, 0x5c },
	{ 0x3a0a, 0x00 },
	{ 0x3a0b, 0x4d },
	{ 0x3a0d, 0x08 },
	{ 0x3a0e, 0x06 },
	{ 0x3a14, 0x02 },
	{ 0x3a15, 0x28 },
	{ 0x3623, 0x00 },
	{ 0x3634, 0x76 },
	{ 0x3701, 0x44 },
	{ 0x3702, 0x18 },
	{ 0x3703, 0x24 },
	{ 0x3704, 0x24 },
	{ 0x3705, 0x0c },
	{ REG_TIMING_VERT_FORMAT, 0x81 },
	{ REG_TIMING_HORIZ_FORMAT, 0x01 },
	{ 0x370a, 0x52 },
	{ REG_VFIFO_READ_START_H, 0x00 },
	{ REG_VFIFO_READ_START_L, 0x80 },
	{ REG_ISP_CTRL02, 0x00 },
	{ REG_NULL, 0x00 },
};

/* 640X480 VGA */
static struct sensor_register ov2659_vga[] = {
	{ REG_TIMING_HS_H, 0x00 },
	{ REG_TIMING_HS_L, 0x00 },
	{ REG_TIMING_VS_H, 0x00 },
	{ REG_TIMING_VS_L, 0x00 },
	{ REG_TIMING_HW_H, 0x06 },
	{ REG_TIMING_HW_L, 0x5f },
	{ REG_TIMING_VH_H, 0x04 },
	{ REG_TIMING_VH_L, 0xb7 },
	{ REG_TIMING_DVPHO_H, 0x02 },
	{ REG_TIMING_DVPHO_L, 0x80 },
	{ REG_TIMING_DVPVO_H, 0x01 },
	{ REG_TIMING_DVPVO_L, 0xe0 },
	{ REG_TIMING_HTS_H, 0x05 },
	{ REG_TIMING_HTS_L, 0x14 },
	{ REG_TIMING_VTS_H, 0x02 },
	{ REG_TIMING_VTS_L, 0x68 },
	{ REG_TIMING_HOFFS_L, 0x08 },
	{ REG_TIMING_VOFFS_L, 0x02 },
	{ REG_TIMING_XINC, 0x31 },
	{ REG_TIMING_YINC, 0x31 },
	{ 0x3a02, 0x02 },
	{ 0x3a03, 0x68 },
	{ 0x3a08, 0x00 },
	{ 0x3a09, 0x5c },
	{ 0x3a0a, 0x00 },
	{ 0x3a0b, 0x4d },
	{ 0x3a0d, 0x08 },
	{ 0x3a0e, 0x06 },
	{ 0x3a14, 0x02 },
	{ 0x3a15, 0x28 },
	{ 0x3623, 0x00 },
	{ 0x3634, 0x76 },
	{ 0x3701, 0x44 },
	{ 0x3702, 0x18 },
	{ 0x3703, 0x24 },
	{ 0x3704, 0x24 },
	{ 0x3705, 0x0c },
	{ REG_TIMING_VERT_FORMAT, 0x81 },
	{ REG_TIMING_HORIZ_FORMAT, 0x01 },
	{ 0x370a, 0x52 },
	{ REG_VFIFO_READ_START_H, 0x00 },
	{ REG_VFIFO_READ_START_L, 0xa0 },
	{ REG_ISP_CTRL02, 0x10 },
	{ REG_NULL, 0x00 },
};

/* 320X240 QVGA */
static  struct sensor_register ov2659_qvga[] = {
	{ REG_TIMING_HS_H, 0x00 },
	{ REG_TIMING_HS_L, 0x00 },
	{ REG_TIMING_VS_H, 0x00 },
	{ REG_TIMING_VS_L, 0x00 },
	{ REG_TIMING_HW_H, 0x06 },
	{ REG_TIMING_HW_L, 0x5f },
	{ REG_TIMING_VH_H, 0x04 },
	{ REG_TIMING_VH_L, 0xb7 },
	{ REG_TIMING_DVPHO_H, 0x01 },
	{ REG_TIMING_DVPHO_L, 0x40 },
	{ REG_TIMING_DVPVO_H, 0x00 },
	{ REG_TIMING_DVPVO_L, 0xf0 },
	{ REG_TIMING_HTS_H, 0x05 },
	{ REG_TIMING_HTS_L, 0x14 },
	{ REG_TIMING_VTS_H, 0x02 },
	{ REG_TIMING_VTS_L, 0x68 },
	{ REG_TIMING_HOFFS_L, 0x08 },
	{ REG_TIMING_VOFFS_L, 0x02 },
	{ REG_TIMING_XINC, 0x31 },
	{ REG_TIMING_YINC, 0x31 },
	{ 0x3a02, 0x02 },
	{ 0x3a03, 0x68 },
	{ 0x3a08, 0x00 },
	{ 0x3a09, 0x5c },
	{ 0x3a0a, 0x00 },
	{ 0x3a0b, 0x4d },
	{ 0x3a0d, 0x08 },
	{ 0x3a0e, 0x06 },
	{ 0x3a14, 0x02 },
	{ 0x3a15, 0x28 },
	{ 0x3623, 0x00 },
	{ 0x3634, 0x76 },
	{ 0x3701, 0x44 },
	{ 0x3702, 0x18 },
	{ 0x3703, 0x24 },
	{ 0x3704, 0x24 },
	{ 0x3705, 0x0c },
	{ REG_TIMING_VERT_FORMAT, 0x81 },
	{ REG_TIMING_HORIZ_FORMAT, 0x01 },
	{ 0x370a, 0x52 },
	{ REG_VFIFO_READ_START_H, 0x00 },
	{ REG_VFIFO_READ_START_L, 0xa0 },
	{ REG_ISP_CTRL02, 0x10 },
	{ REG_NULL, 0x00 },
};

static const struct pll_ctrl_reg ctrl3[] = {
	{ 1, 0x00 },
	{ 2, 0x02 },
	{ 3, 0x03 },
	{ 4, 0x06 },
	{ 6, 0x0d },
	{ 8, 0x0e },
	{ 12, 0x0f },
	{ 16, 0x12 },
	{ 24, 0x13 },
	{ 32, 0x16 },
	{ 48, 0x1b },
	{ 64, 0x1e },
	{ 96, 0x1f },
	{ 0, 0x00 },
};

static const struct pll_ctrl_reg ctrl1[] = {
	{ 2, 0x10 },
	{ 4, 0x20 },
	{ 6, 0x30 },
	{ 8, 0x40 },
	{ 10, 0x50 },
	{ 12, 0x60 },
	{ 14, 0x70 },
	{ 16, 0x80 },
	{ 18, 0x90 },
	{ 20, 0xa0 },
	{ 22, 0xb0 },
	{ 24, 0xc0 },
	{ 26, 0xd0 },
	{ 28, 0xe0 },
	{ 30, 0xf0 },
	{ 0, 0x00 },
};

static const struct ov2659_framesize ov2659_framesizes[] = {
	{ /* QVGA */
		.width		= 320,
		.height		= 240,
		.regs		= ov2659_qvga,
		.max_exp_lines	= 248,
	}, { /* VGA */
		.width		= 640,
		.height		= 480,
		.regs		= ov2659_vga,
		.max_exp_lines	= 498,
	}, { /* SVGA */
		.width		= 800,
		.height		= 600,
		.regs		= ov2659_svga,
		.max_exp_lines	= 498,
	}, { /* XGA */
		.width		= 1024,
		.height		= 768,
		.regs		= ov2659_xga,
		.max_exp_lines	= 498,
	}, { /* 720P */
		.width		= 1280,
		.height		= 720,
		.regs		= ov2659_720p,
		.max_exp_lines	= 498,
	}, { /* SXGA */
		.width		= 1280,
		.height		= 1024,
		.regs		= ov2659_sxga,
		.max_exp_lines	= 1048,
	}, { /* UXGA */
		.width		= 1600,
		.height		= 1200,
		.regs		= ov2659_uxga,
		.max_exp_lines	= 498,
	},
};

/* YUV422 YUYV*/
static struct sensor_register ov2659_format_yuyv[] = {
	{ REG_FORMAT_CTRL00, 0x30 },
	{ REG_NULL, 0x0 },
};

/* YUV422 UYVY  */
static struct sensor_register ov2659_format_uyvy[] = {
	{ REG_FORMAT_CTRL00, 0x32 },
	{ REG_NULL, 0x0 },
};

/* Raw Bayer BGGR */
static struct sensor_register ov2659_format_bggr[] = {
	{ REG_FORMAT_CTRL00, 0x00 },
	{ REG_NULL, 0x0 },
};

/* RGB565 */
static struct sensor_register ov2659_format_rgb565[] = {
	{ REG_FORMAT_CTRL00, 0x60 },
	{ REG_NULL, 0x0 },
};

static const struct ov2659_pixfmt ov2659_formats[] = {
	{
		.code = MEDIA_BUS_FMT_YUYV8_2X8,
		.format_ctrl_regs = ov2659_format_yuyv,
	}, {
		.code = MEDIA_BUS_FMT_UYVY8_2X8,
		.format_ctrl_regs = ov2659_format_uyvy,
	}, {
		.code = MEDIA_BUS_FMT_RGB565_2X8_BE,
		.format_ctrl_regs = ov2659_format_rgb565,
	}, {
		.code = MEDIA_BUS_FMT_SBGGR8_1X8,
		.format_ctrl_regs = ov2659_format_bggr,
	},
};

static inline struct ov2659 *to_ov2659(struct v4l2_subdev *sd)
{
	return container_of(sd, struct ov2659, sd);
}

/* sensor register write */
static int ov2659_write(struct i2c_client *client, u16 reg, u8 val)
{
	struct i2c_msg msg;
	u8 buf[3];
	int ret;

	buf[0] = reg >> 8;
	buf[1] = reg & 0xFF;
	buf[2] = val;

	msg.addr = client->addr;
	msg.flags = client->flags;
	msg.buf = buf;
	msg.len = sizeof(buf);

	ret = i2c_transfer(client->adapter, &msg, 1);
	if (ret >= 0)
		return 0;

	dev_dbg(&client->dev,
		"ov2659 write reg(0x%x val:0x%x) failed !\n", reg, val);

	return ret;
}

/* sensor register read */
static int ov2659_read(struct i2c_client *client, u16 reg, u8 *val)
{
	struct i2c_msg msg[2];
	u8 buf[2];
	int ret;

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

	msg[0].addr = client->addr;
	msg[0].flags = client->flags;
	msg[0].buf = buf;
	msg[0].len = sizeof(buf);

	msg[1].addr = client->addr;
	msg[1].flags = client->flags | I2C_M_RD;
	msg[1].buf = buf;
	msg[1].len = 1;

	ret = i2c_transfer(client->adapter, msg, 2);
	if (ret >= 0) {
		*val = buf[0];
		return 0;
	}

	dev_dbg(&client->dev,
		"ov2659 read reg(0x%x val:0x%x) failed !\n", reg, *val);

	return ret;
}

static int ov2659_write_array(struct i2c_client *client,
			      const struct sensor_register *regs)
{
	int i, ret = 0;

	for (i = 0; ret == 0 && regs[i].addr; i++)
		ret = ov2659_write(client, regs[i].addr, regs[i].value);

	return ret;
}

static void ov2659_pll_calc_params(struct ov2659 *ov2659)
{
	const struct ov2659_platform_data *pdata = ov2659->pdata;
	u8 ctrl1_reg = 0, ctrl2_reg = 0, ctrl3_reg = 0;
	struct i2c_client *client = ov2659->client;
	unsigned int desired = pdata->link_frequency;
	u32 prediv, postdiv, mult;
	u32 bestdelta = -1;
	u32 delta, actual;
	int i, j;

	for (i = 0; ctrl1[i].div != 0; i++) {
		postdiv = ctrl1[i].div;
		for (j = 0; ctrl3[j].div != 0; j++) {
			prediv = ctrl3[j].div;
			for (mult = 1; mult <= 63; mult++) {
				actual  = ov2659->xvclk_frequency;
				actual *= mult;
				actual /= prediv;
				actual /= postdiv;
				delta = actual - desired;
				delta = abs(delta);

				if ((delta < bestdelta) || (bestdelta == -1)) {
					bestdelta = delta;
					ctrl1_reg = ctrl1[i].reg;
					ctrl2_reg = mult;
					ctrl3_reg = ctrl3[j].reg;
				}
			}
		}
	}

	ov2659->pll.ctrl1 = ctrl1_reg;
	ov2659->pll.ctrl2 = ctrl2_reg;
	ov2659->pll.ctrl3 = ctrl3_reg;

	dev_dbg(&client->dev,
		"Actual reg config: ctrl1_reg: %02x ctrl2_reg: %02x ctrl3_reg: %02x\n",
		ctrl1_reg, ctrl2_reg, ctrl3_reg);
}

static int ov2659_set_pixel_clock(struct ov2659 *ov2659)
{
	struct i2c_client *client = ov2659->client;
	struct sensor_register pll_regs[] = {
		{REG_SC_PLL_CTRL1, ov2659->pll.ctrl1},
		{REG_SC_PLL_CTRL2, ov2659->pll.ctrl2},
		{REG_SC_PLL_CTRL3, ov2659->pll.ctrl3},
		{REG_NULL, 0x00},
	};

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

	return ov2659_write_array(client, pll_regs);
};

static void ov2659_get_default_format(struct v4l2_mbus_framefmt *format)
{
	format->width = ov2659_framesizes[2].width;
	format->height = ov2659_framesizes[2].height;
	format->colorspace = V4L2_COLORSPACE_SRGB;
	format->code = ov2659_formats[0].code;
	format->field = V4L2_FIELD_NONE;
}

static void ov2659_set_streaming(struct ov2659 *ov2659, int on)
{
	struct i2c_client *client = ov2659->client;
	int ret;

	on = !!on;

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

	ret = ov2659_write(client, REG_SOFTWARE_STANDBY, on);
	if (ret)
		dev_err(&client->dev, "ov2659 soft standby failed\n");
}

static int ov2659_init(struct v4l2_subdev *sd, u32 val)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	return ov2659_write_array(client, ov2659_init_regs);
}

/*
 * V4L2 subdev video and pad level operations
 */

static int ov2659_enum_mbus_code(struct v4l2_subdev *sd,
				 struct v4l2_subdev_state *sd_state,
				 struct v4l2_subdev_mbus_code_enum *code)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

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

	if (code->index >= ARRAY_SIZE(ov2659_formats))
		return -EINVAL;

	code->code = ov2659_formats[code->index].code;

	return 0;
}

static int ov2659_enum_frame_sizes(struct v4l2_subdev *sd,
				   struct v4l2_subdev_state *sd_state,
				   struct v4l2_subdev_frame_size_enum *fse)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int i = ARRAY_SIZE(ov2659_formats);

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

	if (fse->index >= ARRAY_SIZE(ov2659_framesizes))
		return -EINVAL;

	while (--i)
		if (fse->code == ov2659_formats[i].code)
			break;

	fse->code = ov2659_formats[i].code;

	fse->min_width  = ov2659_framesizes[fse->index].width;
	fse->max_width  = fse->min_width;
	fse->max_height = ov2659_framesizes[fse->index].height;
	fse->min_height = fse->max_height;

	return 0;
}

static int ov2659_get_fmt(struct v4l2_subdev *sd,
			  struct v4l2_subdev_state *sd_state,
			  struct v4l2_subdev_format *fmt)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct ov2659 *ov2659 = to_ov2659(sd);

	dev_dbg(&client->dev, "ov2659_get_fmt\n");

	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
		struct v4l2_mbus_framefmt *mf;

		mf = v4l2_subdev_state_get_format(sd_state, 0);
		mutex_lock(&ov2659->lock);
		fmt->format = *mf;
		mutex_unlock(&ov2659->lock);
		return 0;
	}

	mutex_lock(&ov2659->lock);
	fmt->format = ov2659->format;
	mutex_unlock(&ov2659->lock);

	dev_dbg(&client->dev, "ov2659_get_fmt: %x %dx%d\n",
		ov2659->format.code, ov2659->format.width,
		ov2659->format.height);

	return 0;
}

static void __ov2659_try_frame_size(struct v4l2_mbus_framefmt *mf,
				    const struct ov2659_framesize **size)
{
	const struct ov2659_framesize *fsize = &ov2659_framesizes[0];
	const struct ov2659_framesize *match = NULL;
	int i = ARRAY_SIZE(ov2659_framesizes);
	unsigned int min_err = UINT_MAX;

	while (i--) {
		int err = abs(fsize->width - mf->width)
				+ abs(fsize->height - mf->height);
		if ((err < min_err) && (fsize->regs[0].addr)) {
			min_err = err;
			match = fsize;
		}
		fsize++;
	}

	if (!match)
		match = &ov2659_framesizes[2];

	mf->width  = match->width;
	mf->height = match->height;

	if (size)
		*size = match;
}

static int ov2659_set_fmt(struct v4l2_subdev *sd,
			  struct v4l2_subdev_state *sd_state,
			  struct v4l2_subdev_format *fmt)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int index = ARRAY_SIZE(ov2659_formats);
	struct v4l2_mbus_framefmt *mf = &fmt->format;
	const struct ov2659_framesize *size = NULL;
	struct ov2659 *ov2659 = to_ov2659(sd);
	int ret = 0;

	dev_dbg(&client->dev, "ov2659_set_fmt\n");

	__ov2659_try_frame_size(mf, &size);

	while (--index >= 0)
		if (ov2659_formats[index].code == mf->code)
			break;

	if (index < 0) {
		index = 0;
		mf->code = ov2659_formats[index].code;
	}

	mf->colorspace = V4L2_COLORSPACE_SRGB;
	mf->field = V4L2_FIELD_NONE;

	mutex_lock(&ov2659->lock);

	if (fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
		mf = v4l2_subdev_state_get_format(sd_state, fmt->pad);
		*mf = fmt->format;
	} else {
		s64 val;

		if (ov2659->streaming) {
			mutex_unlock(&ov2659->lock);
			return -EBUSY;
		}

		ov2659->frame_size = size;
		ov2659->format = fmt->format;
		ov2659->format_ctrl_regs =
			ov2659_formats[index].format_ctrl_regs;

		if (ov2659->format.code != MEDIA_BUS_FMT_SBGGR8_1X8)
			val = ov2659->pdata->link_frequency / 2;
		else
			val = ov2659->pdata->link_frequency;

		ret = v4l2_ctrl_s_ctrl_int64(ov2659->link_frequency, val);
		if (ret < 0)
			dev_warn(&client->dev,
				 "failed to set link_frequency rate (%d)\n",
				 ret);
	}

	mutex_unlock(&ov2659->lock);
	return ret;
}

static int ov2659_set_frame_size(struct ov2659 *ov2659)
{
	struct i2c_client *client = ov2659->client;

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

	return ov2659_write_array(ov2659->client, ov2659->frame_size->regs);
}

static int ov2659_set_format(struct ov2659 *ov2659)
{
	struct i2c_client *client = ov2659->client;

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

	return ov2659_write_array(ov2659->client, ov2659->format_ctrl_regs);
}

static int ov2659_s_stream(struct v4l2_subdev *sd, int on)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct ov2659 *ov2659 = to_ov2659(sd);
	int ret = 0;

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

	mutex_lock(&ov2659->lock);

	on = !!on;

	if (ov2659->streaming == on)
		goto unlock;

	if (!on) {
		/* Stop Streaming Sequence */
		ov2659_set_streaming(ov2659, 0);
		ov2659->streaming = on;
		pm_runtime_put(&client->dev);
		goto unlock;
	}

	ret = pm_runtime_resume_and_get(&client->dev);
	if (ret < 0)
		goto unlock;

	ret = ov2659_init(sd, 0);
	if (!ret)
		ret = ov2659_set_pixel_clock(ov2659);
	if (!ret)
		ret = ov2659_set_frame_size(ov2659);
	if (!ret)
		ret = ov2659_set_format(ov2659);
	if (!ret) {
		ov2659_set_streaming(ov2659, 1);
		ov2659->streaming = on;
	}

unlock:
	mutex_unlock(&ov2659->lock);
	return ret;
}

static int ov2659_set_test_pattern(struct ov2659 *ov2659, int value)
{
	struct i2c_client *client = v4l2_get_subdevdata(&ov2659->sd);
	int ret;
	u8 val;

	ret = ov2659_read(client, REG_PRE_ISP_CTRL00, &val);
	if (ret < 0)
		return ret;

	switch (value) {
	case 0:
		val &= ~TEST_PATTERN_ENABLE;
		break;
	case 1:
		val &= VERTICAL_COLOR_BAR_MASK;
		val |= TEST_PATTERN_ENABLE;
		break;
	}

	return ov2659_write(client, REG_PRE_ISP_CTRL00, val);
}

static int ov2659_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct ov2659 *ov2659 =
			container_of(ctrl->handler, struct ov2659, ctrls);
	struct i2c_client *client = ov2659->client;

	/* V4L2 controls values will be applied only when power is already up */
	if (!pm_runtime_get_if_in_use(&client->dev))
		return 0;

	switch (ctrl->id) {
	case V4L2_CID_TEST_PATTERN:
		return ov2659_set_test_pattern(ov2659, ctrl->val);
	}

	pm_runtime_put(&client->dev);
	return 0;
}

static const struct v4l2_ctrl_ops ov2659_ctrl_ops = {
	.s_ctrl = ov2659_s_ctrl,
};

static const char * const ov2659_test_pattern_menu[] = {
	"Disabled",
	"Vertical Color Bars",
};

static int ov2659_power_off(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov2659 *ov2659 = to_ov2659(sd);

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

	gpiod_set_value(ov2659->pwdn_gpio, 1);

	clk_disable_unprepare(ov2659->clk);

	return 0;
}

static int ov2659_power_on(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov2659 *ov2659 = to_ov2659(sd);
	int ret;

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

	ret = clk_prepare_enable(ov2659->clk);
	if (ret) {
		dev_err(&client->dev, "%s: failed to enable clock\n",
			__func__);
		return ret;
	}

	gpiod_set_value(ov2659->pwdn_gpio, 0);

	if (ov2659->resetb_gpio) {
		gpiod_set_value(ov2659->resetb_gpio, 1);
		usleep_range(500, 1000);
		gpiod_set_value(ov2659->resetb_gpio, 0);
		usleep_range(3000, 5000);
	}

	return 0;
}

/* -----------------------------------------------------------------------------
 * V4L2 subdev internal operations
 */

static int ov2659_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct v4l2_mbus_framefmt *format =
				v4l2_subdev_state_get_format(fh->state, 0);

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

	ov2659_get_default_format(format);

	return 0;
}

static const struct v4l2_subdev_core_ops ov2659_subdev_core_ops = {
	.log_status = v4l2_ctrl_subdev_log_status,
	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
};

static const struct v4l2_subdev_video_ops ov2659_subdev_video_ops = {
	.s_stream = ov2659_s_stream,
};

static const struct v4l2_subdev_pad_ops ov2659_subdev_pad_ops = {
	.enum_mbus_code = ov2659_enum_mbus_code,
	.enum_frame_size = ov2659_enum_frame_sizes,
	.get_fmt = ov2659_get_fmt,
	.set_fmt = ov2659_set_fmt,
};

static const struct v4l2_subdev_ops ov2659_subdev_ops = {
	.core  = &ov2659_subdev_core_ops,
	.video = &ov2659_subdev_video_ops,
	.pad   = &ov2659_subdev_pad_ops,
};

static const struct v4l2_subdev_internal_ops ov2659_subdev_internal_ops = {
	.open = ov2659_open,
};

static int ov2659_detect(struct v4l2_subdev *sd)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	u8 pid = 0;
	u8 ver = 0;
	int ret;

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

	ret = ov2659_write(client, REG_SOFTWARE_RESET, 0x01);
	if (ret != 0) {
		dev_err(&client->dev, "Sensor soft reset failed\n");
		return -ENODEV;
	}
	usleep_range(1000, 2000);

	/* Check sensor revision */
	ret = ov2659_read(client, REG_SC_CHIP_ID_H, &pid);
	if (!ret)
		ret = ov2659_read(client, REG_SC_CHIP_ID_L, &ver);

	if (!ret) {
		unsigned short id;

		id = OV265X_ID(pid, ver);
		if (id != OV2659_ID) {
			dev_err(&client->dev,
				"Sensor detection failed (%04X)\n", id);
			ret = -ENODEV;
		} else {
			dev_info(&client->dev, "Found OV%04X sensor\n", id);
		}
	}

	return ret;
}

static struct ov2659_platform_data *
ov2659_get_pdata(struct i2c_client *client)
{
	struct ov2659_platform_data *pdata;
	struct v4l2_fwnode_endpoint bus_cfg = { .bus_type = 0 };
	struct device_node *endpoint;
	int ret;

	if (!IS_ENABLED(CONFIG_OF) || !client->dev.of_node)
		return client->dev.platform_data;

	endpoint = of_graph_get_endpoint_by_regs(client->dev.of_node, 0, -1);
	if (!endpoint)
		return NULL;

	ret = v4l2_fwnode_endpoint_alloc_parse(of_fwnode_handle(endpoint),
					       &bus_cfg);
	if (ret) {
		pdata = NULL;
		goto done;
	}

	pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		goto done;

	if (!bus_cfg.nr_of_link_frequencies) {
		dev_err(&client->dev,
			"link-frequencies property not found or too many\n");
		pdata = NULL;
		goto done;
	}

	pdata->link_frequency = bus_cfg.link_frequencies[0];

done:
	v4l2_fwnode_endpoint_free(&bus_cfg);
	of_node_put(endpoint);
	return pdata;
}

static int ov2659_probe(struct i2c_client *client)
{
	const struct ov2659_platform_data *pdata = ov2659_get_pdata(client);
	struct v4l2_subdev *sd;
	struct ov2659 *ov2659;
	int ret;

	if (!pdata) {
		dev_err(&client->dev, "platform data not specified\n");
		return -EINVAL;
	}

	ov2659 = devm_kzalloc(&client->dev, sizeof(*ov2659), GFP_KERNEL);
	if (!ov2659)
		return -ENOMEM;

	ov2659->pdata = pdata;
	ov2659->client = client;

	ov2659->clk = devm_clk_get(&client->dev, "xvclk");
	if (IS_ERR(ov2659->clk))
		return PTR_ERR(ov2659->clk);

	ov2659->xvclk_frequency = clk_get_rate(ov2659->clk);
	if (ov2659->xvclk_frequency < 6000000 ||
	    ov2659->xvclk_frequency > 27000000)
		return -EINVAL;

	/* Optional gpio don't fail if not present */
	ov2659->pwdn_gpio = devm_gpiod_get_optional(&client->dev, "powerdown",
						    GPIOD_OUT_LOW);
	if (IS_ERR(ov2659->pwdn_gpio))
		return PTR_ERR(ov2659->pwdn_gpio);

	/* Optional gpio don't fail if not present */
	ov2659->resetb_gpio = devm_gpiod_get_optional(&client->dev, "reset",
						      GPIOD_OUT_HIGH);
	if (IS_ERR(ov2659->resetb_gpio))
		return PTR_ERR(ov2659->resetb_gpio);

	v4l2_ctrl_handler_init(&ov2659->ctrls, 2);
	ov2659->link_frequency =
			v4l2_ctrl_new_std(&ov2659->ctrls, &ov2659_ctrl_ops,
					  V4L2_CID_PIXEL_RATE,
					  pdata->link_frequency / 2,
					  pdata->link_frequency, 1,
					  pdata->link_frequency);
	v4l2_ctrl_new_std_menu_items(&ov2659->ctrls, &ov2659_ctrl_ops,
				     V4L2_CID_TEST_PATTERN,
				     ARRAY_SIZE(ov2659_test_pattern_menu) - 1,
				     0, 0, ov2659_test_pattern_menu);

	if (ov2659->ctrls.error) {
		dev_err(&client->dev, "%s: control initialization error %d\n",
			__func__, ov2659->ctrls.error);
		v4l2_ctrl_handler_free(&ov2659->ctrls);
		return  ov2659->ctrls.error;
	}

	ov2659->sd.ctrl_handler = &ov2659->ctrls;
	sd = &ov2659->sd;
	client->flags |= I2C_CLIENT_SCCB;

	v4l2_i2c_subdev_init(sd, client, &ov2659_subdev_ops);
	sd->internal_ops = &ov2659_subdev_internal_ops;
	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
		     V4L2_SUBDEV_FL_HAS_EVENTS;

	ov2659->pad.flags = MEDIA_PAD_FL_SOURCE;
	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
	ret = media_entity_pads_init(&sd->entity, 1, &ov2659->pad);
	if (ret < 0) {
		v4l2_ctrl_handler_free(&ov2659->ctrls);
		return ret;
	}

	mutex_init(&ov2659->lock);

	ov2659_get_default_format(&ov2659->format);
	ov2659->frame_size = &ov2659_framesizes[2];
	ov2659->format_ctrl_regs = ov2659_formats[0].format_ctrl_regs;

	ret = ov2659_power_on(&client->dev);
	if (ret < 0)
		goto error;

	ret = ov2659_detect(sd);
	if (ret < 0)
		goto error;

	/* Calculate the PLL register value needed */
	ov2659_pll_calc_params(ov2659);

	ret = v4l2_async_register_subdev(&ov2659->sd);
	if (ret)
		goto error;

	dev_info(&client->dev, "%s sensor driver registered !!\n", sd->name);

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

	return 0;

error:
	v4l2_ctrl_handler_free(&ov2659->ctrls);
	ov2659_power_off(&client->dev);
	media_entity_cleanup(&sd->entity);
	mutex_destroy(&ov2659->lock);
	return ret;
}

static void ov2659_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct ov2659 *ov2659 = to_ov2659(sd);

	v4l2_ctrl_handler_free(&ov2659->ctrls);
	v4l2_async_unregister_subdev(sd);
	media_entity_cleanup(&sd->entity);
	mutex_destroy(&ov2659->lock);

	pm_runtime_disable(&client->dev);
	if (!pm_runtime_status_suspended(&client->dev))
		ov2659_power_off(&client->dev);
	pm_runtime_set_suspended(&client->dev);
}

static const struct dev_pm_ops ov2659_pm_ops = {
	SET_RUNTIME_PM_OPS(ov2659_power_off, ov2659_power_on, NULL)
};

static const struct i2c_device_id ov2659_id[] = {
	{ "ov2659" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, ov2659_id);

#if IS_ENABLED(CONFIG_OF)
static const struct of_device_id ov2659_of_match[] = {
	{ .compatible = "ovti,ov2659", },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ov2659_of_match);
#endif

static struct i2c_driver ov2659_i2c_driver = {
	.driver = {
		.name	= DRIVER_NAME,
		.pm	= &ov2659_pm_ops,
		.of_match_table = of_match_ptr(ov2659_of_match),
	},
	.probe		= ov2659_probe,
	.remove		= ov2659_remove,
	.id_table	= ov2659_id,
};

module_i2c_driver(ov2659_i2c_driver);

MODULE_AUTHOR("Benoit Parrot <bparrot@ti.com>");
MODULE_DESCRIPTION("OV2659 CMOS Image Sensor driver");
MODULE_LICENSE("GPL v2");
