// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2020 Bootlin
 * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/videodev2.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-image-sizes.h>
#include <media/v4l2-mediabus.h>

/* Clock rate */

#define OV5648_XVCLK_RATE			24000000

/* Register definitions */

/* System */

#define OV5648_SW_STANDBY_REG			0x100
#define OV5648_SW_STANDBY_STREAM_ON		BIT(0)

#define OV5648_SW_RESET_REG			0x103
#define OV5648_SW_RESET_RESET			BIT(0)

#define OV5648_PAD_OEN0_REG			0x3000
#define OV5648_PAD_OEN1_REG			0x3001
#define OV5648_PAD_OEN2_REG			0x3002
#define OV5648_PAD_OUT0_REG			0x3008
#define OV5648_PAD_OUT1_REG			0x3009

#define OV5648_CHIP_ID_H_REG			0x300a
#define OV5648_CHIP_ID_H_VALUE			0x56
#define OV5648_CHIP_ID_L_REG			0x300b
#define OV5648_CHIP_ID_L_VALUE			0x48

#define OV5648_PAD_OUT2_REG			0x300d
#define OV5648_PAD_SEL0_REG			0x300e
#define OV5648_PAD_SEL1_REG			0x300f
#define OV5648_PAD_SEL2_REG			0x3010
#define OV5648_PAD_PK_REG			0x3011
#define OV5648_PAD_PK_PD_DATO_EN		BIT(7)
#define OV5648_PAD_PK_DRIVE_STRENGTH_1X		(0 << 5)
#define OV5648_PAD_PK_DRIVE_STRENGTH_2X		(2 << 5)
#define OV5648_PAD_PK_FREX_N			BIT(1)

#define OV5648_A_PWC_PK_O0_REG			0x3013
#define OV5648_A_PWC_PK_O0_BP_REGULATOR_N	BIT(3)
#define OV5648_A_PWC_PK_O1_REG			0x3014

#define OV5648_MIPI_PHY0_REG			0x3016
#define OV5648_MIPI_PHY1_REG			0x3017
#define OV5648_MIPI_SC_CTRL0_REG		0x3018
#define OV5648_MIPI_SC_CTRL0_MIPI_LANES(v)	(((v) << 5) & GENMASK(7, 5))
#define OV5648_MIPI_SC_CTRL0_PHY_HS_TX_PD	BIT(4)
#define OV5648_MIPI_SC_CTRL0_PHY_LP_RX_PD	BIT(3)
#define OV5648_MIPI_SC_CTRL0_MIPI_EN		BIT(2)
#define OV5648_MIPI_SC_CTRL0_MIPI_SUSP		BIT(1)
#define OV5648_MIPI_SC_CTRL0_LANE_DIS_OP	BIT(0)
#define OV5648_MIPI_SC_CTRL1_REG		0x3019
#define OV5648_MISC_CTRL0_REG			0x3021
#define OV5648_MIPI_SC_CTRL2_REG		0x3022
#define OV5648_SUB_ID_REG			0x302a

#define OV5648_PLL_CTRL0_REG			0x3034
#define OV5648_PLL_CTRL0_PLL_CHARGE_PUMP(v)	(((v) << 4) & GENMASK(6, 4))
#define OV5648_PLL_CTRL0_BITS(v)		((v) & GENMASK(3, 0))
#define OV5648_PLL_CTRL1_REG			0x3035
#define OV5648_PLL_CTRL1_SYS_DIV(v)		(((v) << 4) & GENMASK(7, 4))
#define OV5648_PLL_CTRL1_MIPI_DIV(v)		((v) & GENMASK(3, 0))
#define OV5648_PLL_MUL_REG			0x3036
#define OV5648_PLL_MUL(v)			((v) & GENMASK(7, 0))
#define OV5648_PLL_DIV_REG			0x3037
#define OV5648_PLL_DIV_ROOT_DIV(v)		((((v) - 1) << 4) & BIT(4))
#define OV5648_PLL_DIV_PLL_PRE_DIV(v)		((v) & GENMASK(3, 0))
#define OV5648_PLL_DEBUG_REG			0x3038
#define OV5648_PLL_BYPASS_REG			0x3039

#define OV5648_PLLS_BYPASS_REG			0x303a
#define OV5648_PLLS_MUL_REG			0x303b
#define OV5648_PLLS_MUL(v)			((v) & GENMASK(4, 0))
#define OV5648_PLLS_CTRL_REG			0x303c
#define OV5648_PLLS_CTRL_PLL_CHARGE_PUMP(v)	(((v) << 4) & GENMASK(6, 4))
#define OV5648_PLLS_CTRL_SYS_DIV(v)		((v) & GENMASK(3, 0))
#define OV5648_PLLS_DIV_REG			0x303d
#define OV5648_PLLS_DIV_PLLS_PRE_DIV(v)		(((v) << 4) & GENMASK(5, 4))
#define OV5648_PLLS_DIV_PLLS_DIV_R(v)		((((v) - 1) << 2) & BIT(2))
#define OV5648_PLLS_DIV_PLLS_SEL_DIV(v)		((v) & GENMASK(1, 0))

#define OV5648_SRB_CTRL_REG			0x3106
#define OV5648_SRB_CTRL_SCLK_DIV(v)		(((v) << 2) & GENMASK(3, 2))
#define OV5648_SRB_CTRL_RESET_ARBITER_EN	BIT(1)
#define OV5648_SRB_CTRL_SCLK_ARBITER_EN		BIT(0)

/* Group Hold */

#define OV5648_GROUP_ADR0_REG			0x3200
#define OV5648_GROUP_ADR1_REG			0x3201
#define OV5648_GROUP_ADR2_REG			0x3202
#define OV5648_GROUP_ADR3_REG			0x3203
#define OV5648_GROUP_LEN0_REG			0x3204
#define OV5648_GROUP_LEN1_REG			0x3205
#define OV5648_GROUP_LEN2_REG			0x3206
#define OV5648_GROUP_LEN3_REG			0x3207
#define OV5648_GROUP_ACCESS_REG			0x3208

/* Exposure/gain/banding */

#define OV5648_EXPOSURE_CTRL_HH_REG		0x3500
#define OV5648_EXPOSURE_CTRL_HH(v)		(((v) & GENMASK(19, 16)) >> 16)
#define OV5648_EXPOSURE_CTRL_HH_VALUE(v)	(((v) << 16) & GENMASK(19, 16))
#define OV5648_EXPOSURE_CTRL_H_REG		0x3501
#define OV5648_EXPOSURE_CTRL_H(v)		(((v) & GENMASK(15, 8)) >> 8)
#define OV5648_EXPOSURE_CTRL_H_VALUE(v)		(((v) << 8) & GENMASK(15, 8))
#define OV5648_EXPOSURE_CTRL_L_REG		0x3502
#define OV5648_EXPOSURE_CTRL_L(v)		((v) & GENMASK(7, 0))
#define OV5648_EXPOSURE_CTRL_L_VALUE(v)		((v) & GENMASK(7, 0))
#define OV5648_MANUAL_CTRL_REG			0x3503
#define OV5648_MANUAL_CTRL_FRAME_DELAY(v)	(((v) << 4) & GENMASK(5, 4))
#define OV5648_MANUAL_CTRL_AGC_MANUAL_EN	BIT(1)
#define OV5648_MANUAL_CTRL_AEC_MANUAL_EN	BIT(0)
#define OV5648_GAIN_CTRL_H_REG			0x350a
#define OV5648_GAIN_CTRL_H(v)			(((v) & GENMASK(9, 8)) >> 8)
#define OV5648_GAIN_CTRL_H_VALUE(v)		(((v) << 8) & GENMASK(9, 8))
#define OV5648_GAIN_CTRL_L_REG			0x350b
#define OV5648_GAIN_CTRL_L(v)			((v) & GENMASK(7, 0))
#define OV5648_GAIN_CTRL_L_VALUE(v)		((v) & GENMASK(7, 0))

#define OV5648_ANALOG_CTRL0_REG_BASE		0x3600
#define OV5648_ANALOG_CTRL1_REG_BASE		0x3700

#define OV5648_AEC_CTRL0_REG			0x3a00
#define OV5648_AEC_CTRL0_DEBUG			BIT(6)
#define OV5648_AEC_CTRL0_DEBAND_EN		BIT(5)
#define OV5648_AEC_CTRL0_DEBAND_LOW_LIMIT_EN	BIT(4)
#define OV5648_AEC_CTRL0_START_SEL_EN		BIT(3)
#define OV5648_AEC_CTRL0_NIGHT_MODE_EN		BIT(2)
#define OV5648_AEC_CTRL0_FREEZE_EN		BIT(0)
#define OV5648_EXPOSURE_MIN_REG			0x3a01
#define OV5648_EXPOSURE_MAX_60_H_REG		0x3a02
#define OV5648_EXPOSURE_MAX_60_L_REG		0x3a03
#define OV5648_AEC_CTRL5_REG			0x3a05
#define OV5648_AEC_CTRL6_REG			0x3a06
#define OV5648_AEC_CTRL7_REG			0x3a07
#define OV5648_BANDING_STEP_50_H_REG		0x3a08
#define OV5648_BANDING_STEP_50_L_REG		0x3a09
#define OV5648_BANDING_STEP_60_H_REG		0x3a0a
#define OV5648_BANDING_STEP_60_L_REG		0x3a0b
#define OV5648_AEC_CTRLC_REG			0x3a0c
#define OV5648_BANDING_MAX_60_REG		0x3a0d
#define OV5648_BANDING_MAX_50_REG		0x3a0e
#define OV5648_WPT_REG				0x3a0f
#define OV5648_BPT_REG				0x3a10
#define OV5648_VPT_HIGH_REG			0x3a11
#define OV5648_AVG_MANUAL_REG			0x3a12
#define OV5648_PRE_GAIN_REG			0x3a13
#define OV5648_EXPOSURE_MAX_50_H_REG		0x3a14
#define OV5648_EXPOSURE_MAX_50_L_REG		0x3a15
#define OV5648_GAIN_BASE_NIGHT_REG		0x3a17
#define OV5648_AEC_GAIN_CEILING_H_REG		0x3a18
#define OV5648_AEC_GAIN_CEILING_L_REG		0x3a19
#define OV5648_DIFF_MAX_REG			0x3a1a
#define OV5648_WPT2_REG				0x3a1b
#define OV5648_LED_ADD_ROW_H_REG		0x3a1c
#define OV5648_LED_ADD_ROW_L_REG		0x3a1d
#define OV5648_BPT2_REG				0x3a1e
#define OV5648_VPT_LOW_REG			0x3a1f
#define OV5648_AEC_CTRL20_REG			0x3a20
#define OV5648_AEC_CTRL21_REG			0x3a21

#define OV5648_AVG_START_X_H_REG		0x5680
#define OV5648_AVG_START_X_L_REG		0x5681
#define OV5648_AVG_START_Y_H_REG		0x5682
#define OV5648_AVG_START_Y_L_REG		0x5683
#define OV5648_AVG_WINDOW_X_H_REG		0x5684
#define OV5648_AVG_WINDOW_X_L_REG		0x5685
#define OV5648_AVG_WINDOW_Y_H_REG		0x5686
#define OV5648_AVG_WINDOW_Y_L_REG		0x5687
#define OV5648_AVG_WEIGHT00_REG			0x5688
#define OV5648_AVG_WEIGHT01_REG			0x5689
#define OV5648_AVG_WEIGHT02_REG			0x568a
#define OV5648_AVG_WEIGHT03_REG			0x568b
#define OV5648_AVG_WEIGHT04_REG			0x568c
#define OV5648_AVG_WEIGHT05_REG			0x568d
#define OV5648_AVG_WEIGHT06_REG			0x568e
#define OV5648_AVG_WEIGHT07_REG			0x568f
#define OV5648_AVG_CTRL10_REG			0x5690
#define OV5648_AVG_WEIGHT_SUM_REG		0x5691
#define OV5648_AVG_READOUT_REG			0x5693

#define OV5648_DIG_CTRL0_REG			0x5a00
#define OV5648_DIG_COMP_MAN_H_REG		0x5a02
#define OV5648_DIG_COMP_MAN_L_REG		0x5a03

#define OV5648_GAINC_MAN_H_REG			0x5a20
#define OV5648_GAINC_MAN_L_REG			0x5a21
#define OV5648_GAINC_DGC_MAN_H_REG		0x5a22
#define OV5648_GAINC_DGC_MAN_L_REG		0x5a23
#define OV5648_GAINC_CTRL0_REG			0x5a24

#define OV5648_GAINF_ANA_NUM_REG		0x5a40
#define OV5648_GAINF_DIG_GAIN_REG		0x5a41

/* Timing */

#define OV5648_CROP_START_X_H_REG		0x3800
#define OV5648_CROP_START_X_H(v)		(((v) & GENMASK(11, 8)) >> 8)
#define OV5648_CROP_START_X_L_REG		0x3801
#define OV5648_CROP_START_X_L(v)		((v) & GENMASK(7, 0))
#define OV5648_CROP_START_Y_H_REG		0x3802
#define OV5648_CROP_START_Y_H(v)		(((v) & GENMASK(11, 8)) >> 8)
#define OV5648_CROP_START_Y_L_REG		0x3803
#define OV5648_CROP_START_Y_L(v)		((v) & GENMASK(7, 0))
#define OV5648_CROP_END_X_H_REG			0x3804
#define OV5648_CROP_END_X_H(v)			(((v) & GENMASK(11, 8)) >> 8)
#define OV5648_CROP_END_X_L_REG			0x3805
#define OV5648_CROP_END_X_L(v)			((v) & GENMASK(7, 0))
#define OV5648_CROP_END_Y_H_REG			0x3806
#define OV5648_CROP_END_Y_H(v)			(((v) & GENMASK(11, 8)) >> 8)
#define OV5648_CROP_END_Y_L_REG			0x3807
#define OV5648_CROP_END_Y_L(v)			((v) & GENMASK(7, 0))
#define OV5648_OUTPUT_SIZE_X_H_REG		0x3808
#define OV5648_OUTPUT_SIZE_X_H(v)		(((v) & GENMASK(11, 8)) >> 8)
#define OV5648_OUTPUT_SIZE_X_L_REG		0x3809
#define OV5648_OUTPUT_SIZE_X_L(v)		((v) & GENMASK(7, 0))
#define OV5648_OUTPUT_SIZE_Y_H_REG		0x380a
#define OV5648_OUTPUT_SIZE_Y_H(v)		(((v) & GENMASK(11, 8)) >> 8)
#define OV5648_OUTPUT_SIZE_Y_L_REG		0x380b
#define OV5648_OUTPUT_SIZE_Y_L(v)		((v) & GENMASK(7, 0))
#define OV5648_HTS_H_REG			0x380c
#define OV5648_HTS_H(v)				(((v) & GENMASK(12, 8)) >> 8)
#define OV5648_HTS_L_REG			0x380d
#define OV5648_HTS_L(v)				((v) & GENMASK(7, 0))
#define OV5648_VTS_H_REG			0x380e
#define OV5648_VTS_H(v)				(((v) & GENMASK(15, 8)) >> 8)
#define OV5648_VTS_L_REG			0x380f
#define OV5648_VTS_L(v)				((v) & GENMASK(7, 0))
#define OV5648_OFFSET_X_H_REG			0x3810
#define OV5648_OFFSET_X_H(v)			(((v) & GENMASK(11, 8)) >> 8)
#define OV5648_OFFSET_X_L_REG			0x3811
#define OV5648_OFFSET_X_L(v)			((v) & GENMASK(7, 0))
#define OV5648_OFFSET_Y_H_REG			0x3812
#define OV5648_OFFSET_Y_H(v)			(((v) & GENMASK(11, 8)) >> 8)
#define OV5648_OFFSET_Y_L_REG			0x3813
#define OV5648_OFFSET_Y_L(v)			((v) & GENMASK(7, 0))
#define OV5648_SUB_INC_X_REG			0x3814
#define OV5648_SUB_INC_X_ODD(v)			(((v) << 4) & GENMASK(7, 4))
#define OV5648_SUB_INC_X_EVEN(v)		((v) & GENMASK(3, 0))
#define OV5648_SUB_INC_Y_REG			0x3815
#define OV5648_SUB_INC_Y_ODD(v)			(((v) << 4) & GENMASK(7, 4))
#define OV5648_SUB_INC_Y_EVEN(v)		((v) & GENMASK(3, 0))
#define OV5648_HSYNCST_H_REG			0x3816
#define OV5648_HSYNCST_H(v)			(((v) >> 8) & 0xf)
#define OV5648_HSYNCST_L_REG			0x3817
#define OV5648_HSYNCST_L(v)			((v) & GENMASK(7, 0))
#define OV5648_HSYNCW_H_REG			0x3818
#define OV5648_HSYNCW_H(v)			(((v) >> 8) & 0xf)
#define OV5648_HSYNCW_L_REG			0x3819
#define OV5648_HSYNCW_L(v)			((v) & GENMASK(7, 0))

#define OV5648_TC20_REG				0x3820
#define OV5648_TC20_DEBUG			BIT(6)
#define OV5648_TC20_FLIP_VERT_ISP_EN		BIT(2)
#define OV5648_TC20_FLIP_VERT_SENSOR_EN		BIT(1)
#define OV5648_TC20_BINNING_VERT_EN		BIT(0)
#define OV5648_TC21_REG				0x3821
#define OV5648_TC21_FLIP_HORZ_ISP_EN		BIT(2)
#define OV5648_TC21_FLIP_HORZ_SENSOR_EN		BIT(1)
#define OV5648_TC21_BINNING_HORZ_EN		BIT(0)

/* Strobe/exposure */

#define OV5648_STROBE_REG			0x3b00
#define OV5648_FREX_EXP_HH_REG			0x3b01
#define OV5648_SHUTTER_DLY_H_REG		0x3b02
#define OV5648_SHUTTER_DLY_L_REG		0x3b03
#define OV5648_FREX_EXP_H_REG			0x3b04
#define OV5648_FREX_EXP_L_REG			0x3b05
#define OV5648_FREX_CTRL_REG			0x3b06
#define OV5648_FREX_MODE_SEL_REG		0x3b07
#define OV5648_FREX_MODE_SEL_FREX_SA1		BIT(4)
#define OV5648_FREX_MODE_SEL_FX1_FM_EN		BIT(3)
#define OV5648_FREX_MODE_SEL_FREX_INV		BIT(2)
#define OV5648_FREX_MODE_SEL_MODE1		0x0
#define OV5648_FREX_MODE_SEL_MODE2		0x1
#define OV5648_FREX_MODE_SEL_ROLLING		0x2
#define OV5648_FREX_EXP_REQ_REG			0x3b08
#define OV5648_FREX_SHUTTER_DLY_REG		0x3b09
#define OV5648_FREX_RST_LEN_REG			0x3b0a
#define OV5648_STROBE_WIDTH_HH_REG		0x3b0b
#define OV5648_STROBE_WIDTH_H_REG		0x3b0c

/* OTP */

#define OV5648_OTP_DATA_REG_BASE		0x3d00
#define OV5648_OTP_PROGRAM_CTRL_REG		0x3d80
#define OV5648_OTP_LOAD_CTRL_REG		0x3d81

/* PSRAM */

#define OV5648_PSRAM_CTRL1_REG			0x3f01
#define OV5648_PSRAM_CTRLF_REG			0x3f0f

/* Black Level */

#define OV5648_BLC_CTRL0_REG			0x4000
#define OV5648_BLC_CTRL1_REG			0x4001
#define OV5648_BLC_CTRL1_START_LINE(v)		((v) & GENMASK(5, 0))
#define OV5648_BLC_CTRL2_REG			0x4002
#define OV5648_BLC_CTRL2_AUTO_EN		BIT(6)
#define OV5648_BLC_CTRL2_RESET_FRAME_NUM(v)	((v) & GENMASK(5, 0))
#define OV5648_BLC_CTRL3_REG			0x4003
#define OV5648_BLC_LINE_NUM_REG			0x4004
#define OV5648_BLC_LINE_NUM(v)			((v) & GENMASK(7, 0))
#define OV5648_BLC_CTRL5_REG			0x4005
#define OV5648_BLC_CTRL5_UPDATE_EN		BIT(1)
#define OV5648_BLC_LEVEL_REG			0x4009

/* Frame */

#define OV5648_FRAME_CTRL_REG			0x4200
#define OV5648_FRAME_ON_NUM_REG			0x4201
#define OV5648_FRAME_OFF_NUM_REG		0x4202

/* MIPI CSI-2 */

#define OV5648_MIPI_CTRL0_REG			0x4800
#define OV5648_MIPI_CTRL0_CLK_LANE_AUTOGATE	BIT(5)
#define OV5648_MIPI_CTRL0_LANE_SYNC_EN		BIT(4)
#define OV5648_MIPI_CTRL0_LANE_SELECT_LANE1	0
#define OV5648_MIPI_CTRL0_LANE_SELECT_LANE2	BIT(3)
#define OV5648_MIPI_CTRL0_IDLE_LP00		0
#define OV5648_MIPI_CTRL0_IDLE_LP11		BIT(2)

#define OV5648_MIPI_CTRL1_REG			0x4801
#define OV5648_MIPI_CTRL2_REG			0x4802
#define OV5648_MIPI_CTRL3_REG			0x4803
#define OV5648_MIPI_CTRL4_REG			0x4804
#define OV5648_MIPI_CTRL5_REG			0x4805
#define OV5648_MIPI_MAX_FRAME_COUNT_H_REG	0x4810
#define OV5648_MIPI_MAX_FRAME_COUNT_L_REG	0x4811
#define OV5648_MIPI_CTRL14_REG			0x4814
#define OV5648_MIPI_DT_SPKT_REG			0x4815
#define OV5648_MIPI_HS_ZERO_MIN_H_REG		0x4818
#define OV5648_MIPI_HS_ZERO_MIN_L_REG		0x4819
#define OV5648_MIPI_HS_TRAIN_MIN_H_REG		0x481a
#define OV5648_MIPI_HS_TRAIN_MIN_L_REG		0x481b
#define OV5648_MIPI_CLK_ZERO_MIN_H_REG		0x481c
#define OV5648_MIPI_CLK_ZERO_MIN_L_REG		0x481d
#define OV5648_MIPI_CLK_PREPARE_MIN_H_REG	0x481e
#define OV5648_MIPI_CLK_PREPARE_MIN_L_REG	0x481f
#define OV5648_MIPI_CLK_POST_MIN_H_REG		0x4820
#define OV5648_MIPI_CLK_POST_MIN_L_REG		0x4821
#define OV5648_MIPI_CLK_TRAIL_MIN_H_REG		0x4822
#define OV5648_MIPI_CLK_TRAIL_MIN_L_REG		0x4823
#define OV5648_MIPI_LPX_P_MIN_H_REG		0x4824
#define OV5648_MIPI_LPX_P_MIN_L_REG		0x4825
#define OV5648_MIPI_HS_PREPARE_MIN_H_REG	0x4826
#define OV5648_MIPI_HS_PREPARE_MIN_L_REG	0x4827
#define OV5648_MIPI_HS_EXIT_MIN_H_REG		0x4828
#define OV5648_MIPI_HS_EXIT_MIN_L_REG		0x4829
#define OV5648_MIPI_HS_ZERO_MIN_UI_REG		0x482a
#define OV5648_MIPI_HS_TRAIL_MIN_UI_REG		0x482b
#define OV5648_MIPI_CLK_ZERO_MIN_UI_REG		0x482c
#define OV5648_MIPI_CLK_PREPARE_MIN_UI_REG	0x482d
#define OV5648_MIPI_CLK_POST_MIN_UI_REG		0x482e
#define OV5648_MIPI_CLK_TRAIL_MIN_UI_REG	0x482f
#define OV5648_MIPI_LPX_P_MIN_UI_REG		0x4830
#define OV5648_MIPI_HS_PREPARE_MIN_UI_REG	0x4831
#define OV5648_MIPI_HS_EXIT_MIN_UI_REG		0x4832
#define OV5648_MIPI_REG_MIN_H_REG		0x4833
#define OV5648_MIPI_REG_MIN_L_REG		0x4834
#define OV5648_MIPI_REG_MAX_H_REG		0x4835
#define OV5648_MIPI_REG_MAX_L_REG		0x4836
#define OV5648_MIPI_PCLK_PERIOD_REG		0x4837
#define OV5648_MIPI_WKUP_DLY_REG		0x4838
#define OV5648_MIPI_LP_GPIO_REG			0x483b
#define OV5648_MIPI_SNR_PCLK_DIV_REG		0x4843

/* ISP */

#define OV5648_ISP_CTRL0_REG			0x5000
#define OV5648_ISP_CTRL0_BLACK_CORRECT_EN	BIT(2)
#define OV5648_ISP_CTRL0_WHITE_CORRECT_EN	BIT(1)
#define OV5648_ISP_CTRL1_REG			0x5001
#define OV5648_ISP_CTRL1_AWB_EN			BIT(0)
#define OV5648_ISP_CTRL2_REG			0x5002
#define OV5648_ISP_CTRL2_WIN_EN			BIT(6)
#define OV5648_ISP_CTRL2_OTP_EN			BIT(1)
#define OV5648_ISP_CTRL2_AWB_GAIN_EN		BIT(0)
#define OV5648_ISP_CTRL3_REG			0x5003
#define OV5648_ISP_CTRL3_BUF_EN			BIT(3)
#define OV5648_ISP_CTRL3_BIN_MAN_SET		BIT(2)
#define OV5648_ISP_CTRL3_BIN_AUTO_EN		BIT(1)
#define OV5648_ISP_CTRL4_REG			0x5004
#define OV5648_ISP_CTRL5_REG			0x5005
#define OV5648_ISP_CTRL6_REG			0x5006
#define OV5648_ISP_CTRL7_REG			0x5007
#define OV5648_ISP_MAN_OFFSET_X_H_REG		0x5008
#define OV5648_ISP_MAN_OFFSET_X_L_REG		0x5009
#define OV5648_ISP_MAN_OFFSET_Y_H_REG		0x500a
#define OV5648_ISP_MAN_OFFSET_Y_L_REG		0x500b
#define OV5648_ISP_MAN_WIN_OFFSET_X_H_REG	0x500c
#define OV5648_ISP_MAN_WIN_OFFSET_X_L_REG	0x500d
#define OV5648_ISP_MAN_WIN_OFFSET_Y_H_REG	0x500e
#define OV5648_ISP_MAN_WIN_OFFSET_Y_L_REG	0x500f
#define OV5648_ISP_MAN_WIN_OUTPUT_X_H_REG	0x5010
#define OV5648_ISP_MAN_WIN_OUTPUT_X_L_REG	0x5011
#define OV5648_ISP_MAN_WIN_OUTPUT_Y_H_REG	0x5012
#define OV5648_ISP_MAN_WIN_OUTPUT_Y_L_REG	0x5013
#define OV5648_ISP_MAN_INPUT_X_H_REG		0x5014
#define OV5648_ISP_MAN_INPUT_X_L_REG		0x5015
#define OV5648_ISP_MAN_INPUT_Y_H_REG		0x5016
#define OV5648_ISP_MAN_INPUT_Y_L_REG		0x5017
#define OV5648_ISP_CTRL18_REG			0x5018
#define OV5648_ISP_CTRL19_REG			0x5019
#define OV5648_ISP_CTRL1A_REG			0x501a
#define OV5648_ISP_CTRL1D_REG			0x501d
#define OV5648_ISP_CTRL1F_REG			0x501f
#define OV5648_ISP_CTRL1F_OUTPUT_EN		3
#define OV5648_ISP_CTRL25_REG			0x5025

#define OV5648_ISP_CTRL3D_REG			0x503d
#define OV5648_ISP_CTRL3D_PATTERN_EN		BIT(7)
#define OV5648_ISP_CTRL3D_ROLLING_BAR_EN	BIT(6)
#define OV5648_ISP_CTRL3D_TRANSPARENT_MODE	BIT(5)
#define OV5648_ISP_CTRL3D_SQUARES_BW_MODE	BIT(4)
#define OV5648_ISP_CTRL3D_PATTERN_COLOR_BARS	0
#define OV5648_ISP_CTRL3D_PATTERN_RANDOM_DATA	1
#define OV5648_ISP_CTRL3D_PATTERN_COLOR_SQUARES	2
#define OV5648_ISP_CTRL3D_PATTERN_INPUT		3

#define OV5648_ISP_CTRL3E_REG			0x503e
#define OV5648_ISP_CTRL4B_REG			0x504b
#define OV5648_ISP_CTRL4B_POST_BIN_H_EN		BIT(5)
#define OV5648_ISP_CTRL4B_POST_BIN_V_EN		BIT(4)
#define OV5648_ISP_CTRL4C_REG			0x504c
#define OV5648_ISP_CTRL57_REG			0x5057
#define OV5648_ISP_CTRL58_REG			0x5058
#define OV5648_ISP_CTRL59_REG			0x5059

#define OV5648_ISP_WINDOW_START_X_H_REG		0x5980
#define OV5648_ISP_WINDOW_START_X_L_REG		0x5981
#define OV5648_ISP_WINDOW_START_Y_H_REG		0x5982
#define OV5648_ISP_WINDOW_START_Y_L_REG		0x5983
#define OV5648_ISP_WINDOW_WIN_X_H_REG		0x5984
#define OV5648_ISP_WINDOW_WIN_X_L_REG		0x5985
#define OV5648_ISP_WINDOW_WIN_Y_H_REG		0x5986
#define OV5648_ISP_WINDOW_WIN_Y_L_REG		0x5987
#define OV5648_ISP_WINDOW_MAN_REG		0x5988

/* White Balance */

#define OV5648_AWB_CTRL_REG			0x5180
#define OV5648_AWB_CTRL_FAST_AWB		BIT(6)
#define OV5648_AWB_CTRL_GAIN_FREEZE_EN		BIT(5)
#define OV5648_AWB_CTRL_SUM_FREEZE_EN		BIT(4)
#define OV5648_AWB_CTRL_GAIN_MANUAL_EN		BIT(3)

#define OV5648_AWB_DELTA_REG			0x5181
#define OV5648_AWB_STABLE_RANGE_REG		0x5182
#define OV5648_AWB_STABLE_RANGE_WIDE_REG	0x5183
#define OV5648_HSIZE_MAN_REG			0x5185

#define OV5648_GAIN_RED_MAN_H_REG		0x5186
#define OV5648_GAIN_RED_MAN_H(v)		(((v) & GENMASK(11, 8)) >> 8)
#define OV5648_GAIN_RED_MAN_L_REG		0x5187
#define OV5648_GAIN_RED_MAN_L(v)		((v) & GENMASK(7, 0))
#define OV5648_GAIN_GREEN_MAN_H_REG		0x5188
#define OV5648_GAIN_GREEN_MAN_H(v)		(((v) & GENMASK(11, 8)) >> 8)
#define OV5648_GAIN_GREEN_MAN_L_REG		0x5189
#define OV5648_GAIN_GREEN_MAN_L(v)		((v) & GENMASK(7, 0))
#define OV5648_GAIN_BLUE_MAN_H_REG		0x518a
#define OV5648_GAIN_BLUE_MAN_H(v)		(((v) & GENMASK(11, 8)) >> 8)
#define OV5648_GAIN_BLUE_MAN_L_REG		0x518b
#define OV5648_GAIN_BLUE_MAN_L(v)		((v) & GENMASK(7, 0))
#define OV5648_GAIN_RED_LIMIT_REG		0x518c
#define OV5648_GAIN_GREEN_LIMIT_REG		0x518d
#define OV5648_GAIN_BLUE_LIMIT_REG		0x518e
#define OV5648_AWB_FRAME_COUNT_REG		0x518f
#define OV5648_AWB_BASE_MAN_REG			0x51df

/* Macros */

#define ov5648_subdev_sensor(s) \
	container_of(s, struct ov5648_sensor, subdev)

#define ov5648_ctrl_subdev(c) \
	(&container_of((c)->handler, struct ov5648_sensor, \
		       ctrls.handler)->subdev)

/* Data structures */

struct ov5648_register_value {
	u16 address;
	u8 value;
	unsigned int delay_ms;
};

/*
 * PLL1 Clock Tree:
 *
 * +-< XVCLK
 * |
 * +-+ pll_pre_div (0x3037 [3:0], special values: 5: 1.5, 7: 2.5)
 *   |
 *   +-+ pll_mul (0x3036 [7:0])
 *     |
 *     +-+ sys_div (0x3035 [7:4])
 *       |
 *       +-+ mipi_div (0x3035 [3:0])
 *       | |
 *       | +-> MIPI_SCLK
 *       | |
 *       | +-+ mipi_phy_div (2)
 *       |   |
 *       |   +-> MIPI_CLK
 *       |
 *       +-+ root_div (0x3037 [4])
 *         |
 *         +-+ bit_div (0x3034 [3:0], 8 bits: 2, 10 bits: 2.5, other: 1)
 *           |
 *           +-+ sclk_div (0x3106 [3:2])
 *             |
 *             +-> SCLK
 *             |
 *             +-+ mipi_div (0x3035, 1: PCLK = SCLK)
 *               |
 *               +-> PCLK
 */

struct ov5648_pll1_config {
	unsigned int pll_pre_div;
	unsigned int pll_mul;
	unsigned int sys_div;
	unsigned int root_div;
	unsigned int sclk_div;
	unsigned int mipi_div;
};

/*
 * PLL2 Clock Tree:
 *
 * +-< XVCLK
 * |
 * +-+ plls_pre_div (0x303d [5:4], special values: 0: 1, 1: 1.5)
 *   |
 *   +-+ plls_div_r (0x303d [2])
 *     |
 *     +-+ plls_mul (0x303b [4:0])
 *       |
 *       +-+ sys_div (0x303c [3:0])
 *         |
 *         +-+ sel_div (0x303d [1:0], special values: 0: 1, 3: 2.5)
 *           |
 *           +-> ADCLK
 */

struct ov5648_pll2_config {
	unsigned int plls_pre_div;
	unsigned int plls_div_r;
	unsigned int plls_mul;
	unsigned int sys_div;
	unsigned int sel_div;
};

/*
 * General formulas for (array-centered) mode calculation:
 * - photo_array_width = 2624
 * - crop_start_x = (photo_array_width - output_size_x) / 2
 * - crop_end_x = crop_start_x + offset_x + output_size_x - 1
 *
 * - photo_array_height = 1956
 * - crop_start_y = (photo_array_height - output_size_y) / 2
 * - crop_end_y = crop_start_y + offset_y + output_size_y - 1
 */

struct ov5648_mode {
	unsigned int crop_start_x;
	unsigned int offset_x;
	unsigned int output_size_x;
	unsigned int crop_end_x;
	unsigned int hts;

	unsigned int crop_start_y;
	unsigned int offset_y;
	unsigned int output_size_y;
	unsigned int crop_end_y;
	unsigned int vts;

	bool binning_x;
	bool binning_y;

	unsigned int inc_x_odd;
	unsigned int inc_x_even;
	unsigned int inc_y_odd;
	unsigned int inc_y_even;

	/* 8-bit frame interval followed by 10-bit frame interval. */
	struct v4l2_fract frame_interval[2];

	/* 8-bit config followed by 10-bit config. */
	const struct ov5648_pll1_config *pll1_config[2];
	const struct ov5648_pll2_config *pll2_config;

	const struct ov5648_register_value *register_values;
	unsigned int register_values_count;
};

struct ov5648_state {
	const struct ov5648_mode *mode;
	u32 mbus_code;

	bool streaming;
};

struct ov5648_ctrls {
	struct v4l2_ctrl *exposure_auto;
	struct v4l2_ctrl *exposure;

	struct v4l2_ctrl *gain_auto;
	struct v4l2_ctrl *gain;

	struct v4l2_ctrl *white_balance_auto;
	struct v4l2_ctrl *red_balance;
	struct v4l2_ctrl *blue_balance;

	struct v4l2_ctrl *link_freq;
	struct v4l2_ctrl *pixel_rate;

	struct v4l2_ctrl_handler handler;
};

struct ov5648_sensor {
	struct device *dev;
	struct i2c_client *i2c_client;
	struct gpio_desc *reset;
	struct gpio_desc *powerdown;
	struct regulator *avdd;
	struct regulator *dvdd;
	struct regulator *dovdd;
	struct clk *xvclk;

	struct v4l2_fwnode_endpoint endpoint;
	struct v4l2_subdev subdev;
	struct media_pad pad;

	struct mutex mutex;

	struct ov5648_state state;
	struct ov5648_ctrls ctrls;
};

/* Static definitions */

/*
 * XVCLK = 24 MHz
 * SCLK  = 84 MHz
 * PCLK  = 84 MHz
 */
static const struct ov5648_pll1_config ov5648_pll1_config_native_8_bits = {
	.pll_pre_div	= 3,
	.pll_mul	= 84,
	.sys_div	= 2,
	.root_div	= 1,
	.sclk_div	= 1,
	.mipi_div	= 1,
};

/*
 * XVCLK = 24 MHz
 * SCLK  = 84 MHz
 * PCLK  = 84 MHz
 */
static const struct ov5648_pll1_config ov5648_pll1_config_native_10_bits = {
	.pll_pre_div	= 3,
	.pll_mul	= 105,
	.sys_div	= 2,
	.root_div	= 1,
	.sclk_div	= 1,
	.mipi_div	= 1,
};

/*
 * XVCLK = 24 MHz
 * ADCLK = 200 MHz
 */
static const struct ov5648_pll2_config ov5648_pll2_config_native = {
	.plls_pre_div	= 3,
	.plls_div_r	= 1,
	.plls_mul	= 25,
	.sys_div	= 1,
	.sel_div	= 1,
};

static const struct ov5648_mode ov5648_modes[] = {
	/* 2592x1944 */
	{
		/* Horizontal */
		.crop_start_x	= 16,
		.offset_x	= 0,
		.output_size_x	= 2592,
		.crop_end_x	= 2607,
		.hts		= 2816,

		/* Vertical */
		.crop_start_y	= 6,
		.offset_y	= 0,
		.output_size_y	= 1944,
		.crop_end_y	= 1949,
		.vts		= 1984,

		/* Subsample increase */
		.inc_x_odd	= 1,
		.inc_x_even	= 1,
		.inc_y_odd	= 1,
		.inc_y_even	= 1,

		/* Frame Interval */
		.frame_interval	= {
			{ 1,	15 },
			{ 1,	15 },
		},

		/* PLL */
		.pll1_config	= {
			&ov5648_pll1_config_native_8_bits,
			&ov5648_pll1_config_native_10_bits,
		},
		.pll2_config	= &ov5648_pll2_config_native,
	},
	/* 1600x1200 (UXGA) */
	{
		/* Horizontal */
		.crop_start_x	= 512,
		.offset_x	= 0,
		.output_size_x	= 1600,
		.crop_end_x	= 2111,
		.hts		= 2816,

		/* Vertical */
		.crop_start_y	= 378,
		.offset_y	= 0,
		.output_size_y	= 1200,
		.crop_end_y	= 1577,
		.vts		= 1984,

		/* Subsample increase */
		.inc_x_odd	= 1,
		.inc_x_even	= 1,
		.inc_y_odd	= 1,
		.inc_y_even	= 1,

		/* Frame Interval */
		.frame_interval	= {
			{ 1,	15 },
			{ 1,	15 },
		},

		/* PLL */
		.pll1_config	= {
			&ov5648_pll1_config_native_8_bits,
			&ov5648_pll1_config_native_10_bits,
		},
		.pll2_config	= &ov5648_pll2_config_native,
	},
	/* 1920x1080 (Full HD) */
	{
		/* Horizontal */
		.crop_start_x	= 352,
		.offset_x	= 0,
		.output_size_x	= 1920,
		.crop_end_x	= 2271,
		.hts		= 2816,

		/* Vertical */
		.crop_start_y	= 438,
		.offset_y	= 0,
		.output_size_y	= 1080,
		.crop_end_y	= 1517,
		.vts		= 1984,

		/* Subsample increase */
		.inc_x_odd	= 1,
		.inc_x_even	= 1,
		.inc_y_odd	= 1,
		.inc_y_even	= 1,

		/* Frame Interval */
		.frame_interval	= {
			{ 1,	15 },
			{ 1,	15 },
		},

		/* PLL */
		.pll1_config	= {
			&ov5648_pll1_config_native_8_bits,
			&ov5648_pll1_config_native_10_bits,
		},
		.pll2_config	= &ov5648_pll2_config_native,
	},
	/* 1280x960 */
	{
		/* Horizontal */
		.crop_start_x	= 16,
		.offset_x	= 8,
		.output_size_x	= 1280,
		.crop_end_x	= 2607,
		.hts		= 1912,

		/* Vertical */
		.crop_start_y	= 6,
		.offset_y	= 6,
		.output_size_y	= 960,
		.crop_end_y	= 1949,
		.vts		= 1496,

		/* Binning */
		.binning_x	= true,

		/* Subsample increase */
		.inc_x_odd	= 3,
		.inc_x_even	= 1,
		.inc_y_odd	= 3,
		.inc_y_even	= 1,

		/* Frame Interval */
		.frame_interval	= {
			{ 1,	30 },
			{ 1,	30 },
		},

		/* PLL */
		.pll1_config	= {
			&ov5648_pll1_config_native_8_bits,
			&ov5648_pll1_config_native_10_bits,
		},
		.pll2_config	= &ov5648_pll2_config_native,
	},
	/* 1280x720 (HD) */
	{
		/* Horizontal */
		.crop_start_x	= 16,
		.offset_x	= 8,
		.output_size_x	= 1280,
		.crop_end_x	= 2607,
		.hts		= 1912,

		/* Vertical */
		.crop_start_y	= 254,
		.offset_y	= 2,
		.output_size_y	= 720,
		.crop_end_y	= 1701,
		.vts		= 1496,

		/* Binning */
		.binning_x	= true,

		/* Subsample increase */
		.inc_x_odd	= 3,
		.inc_x_even	= 1,
		.inc_y_odd	= 3,
		.inc_y_even	= 1,

		/* Frame Interval */
		.frame_interval	= {
			{ 1,	30 },
			{ 1,	30 },
		},

		/* PLL */
		.pll1_config	= {
			&ov5648_pll1_config_native_8_bits,
			&ov5648_pll1_config_native_10_bits,
		},
		.pll2_config	= &ov5648_pll2_config_native,
	},
	/* 640x480 (VGA) */
	{
		/* Horizontal */
		.crop_start_x	= 0,
		.offset_x	= 8,
		.output_size_x	= 640,
		.crop_end_x	= 2623,
		.hts		= 1896,

		/* Vertical */
		.crop_start_y	= 0,
		.offset_y	= 2,
		.output_size_y	= 480,
		.crop_end_y	= 1953,
		.vts		= 984,

		/* Binning */
		.binning_x	= true,

		/* Subsample increase */
		.inc_x_odd	= 7,
		.inc_x_even	= 1,
		.inc_y_odd	= 7,
		.inc_y_even	= 1,

		/* Frame Interval */
		.frame_interval	= {
			{ 1,	30 },
			{ 1,	30 },
		},

		/* PLL */
		.pll1_config	= {
			&ov5648_pll1_config_native_8_bits,
			&ov5648_pll1_config_native_10_bits,
		},
		.pll2_config	= &ov5648_pll2_config_native,
	},
};

static const u32 ov5648_mbus_codes[] = {
	MEDIA_BUS_FMT_SBGGR8_1X8,
	MEDIA_BUS_FMT_SBGGR10_1X10,
};

static const struct ov5648_register_value ov5648_init_sequence[] = {
	/* PSRAM */
	{ OV5648_PSRAM_CTRL1_REG, 0x0d },
	{ OV5648_PSRAM_CTRLF_REG, 0xf5 },
};

static const s64 ov5648_link_freq_menu[] = {
	210000000,
	168000000,
};

static const char *const ov5648_test_pattern_menu[] = {
	"Disabled",
	"Random data",
	"Color bars",
	"Color bars with rolling bar",
	"Color squares",
	"Color squares with rolling bar"
};

static const u8 ov5648_test_pattern_bits[] = {
	0,
	OV5648_ISP_CTRL3D_PATTERN_EN | OV5648_ISP_CTRL3D_PATTERN_RANDOM_DATA,
	OV5648_ISP_CTRL3D_PATTERN_EN | OV5648_ISP_CTRL3D_PATTERN_COLOR_BARS,
	OV5648_ISP_CTRL3D_PATTERN_EN | OV5648_ISP_CTRL3D_ROLLING_BAR_EN |
	OV5648_ISP_CTRL3D_PATTERN_COLOR_BARS,
	OV5648_ISP_CTRL3D_PATTERN_EN | OV5648_ISP_CTRL3D_PATTERN_COLOR_SQUARES,
	OV5648_ISP_CTRL3D_PATTERN_EN | OV5648_ISP_CTRL3D_ROLLING_BAR_EN |
	OV5648_ISP_CTRL3D_PATTERN_COLOR_SQUARES,
};

/* Input/Output */

static int ov5648_read(struct ov5648_sensor *sensor, u16 address, u8 *value)
{
	unsigned char data[2] = { address >> 8, address & 0xff };
	struct i2c_client *client = sensor->i2c_client;
	int ret;

	ret = i2c_master_send(client, data, sizeof(data));
	if (ret < 0) {
		dev_dbg(&client->dev, "i2c send error at address %#04x\n",
			address);
		return ret;
	}

	ret = i2c_master_recv(client, value, 1);
	if (ret < 0) {
		dev_dbg(&client->dev, "i2c recv error at address %#04x\n",
			address);
		return ret;
	}

	return 0;
}

static int ov5648_write(struct ov5648_sensor *sensor, u16 address, u8 value)
{
	unsigned char data[3] = { address >> 8, address & 0xff, value };
	struct i2c_client *client = sensor->i2c_client;
	int ret;

	ret = i2c_master_send(client, data, sizeof(data));
	if (ret < 0) {
		dev_dbg(&client->dev, "i2c send error at address %#04x\n",
			address);
		return ret;
	}

	return 0;
}

static int ov5648_write_sequence(struct ov5648_sensor *sensor,
				 const struct ov5648_register_value *sequence,
				 unsigned int sequence_count)
{
	unsigned int i;
	int ret = 0;

	for (i = 0; i < sequence_count; i++) {
		ret = ov5648_write(sensor, sequence[i].address,
				   sequence[i].value);
		if (ret)
			break;

		if (sequence[i].delay_ms)
			msleep(sequence[i].delay_ms);
	}

	return ret;
}

static int ov5648_update_bits(struct ov5648_sensor *sensor, u16 address,
			      u8 mask, u8 bits)
{
	u8 value = 0;
	int ret;

	ret = ov5648_read(sensor, address, &value);
	if (ret)
		return ret;

	value &= ~mask;
	value |= bits;

	ret = ov5648_write(sensor, address, value);
	if (ret)
		return ret;

	return 0;
}

/* Sensor */

static int ov5648_sw_reset(struct ov5648_sensor *sensor)
{
	return ov5648_write(sensor, OV5648_SW_RESET_REG, OV5648_SW_RESET_RESET);
}

static int ov5648_sw_standby(struct ov5648_sensor *sensor, int standby)
{
	u8 value = 0;

	if (!standby)
		value = OV5648_SW_STANDBY_STREAM_ON;

	return ov5648_write(sensor, OV5648_SW_STANDBY_REG, value);
}

static int ov5648_chip_id_check(struct ov5648_sensor *sensor)
{
	u16 regs[] = { OV5648_CHIP_ID_H_REG, OV5648_CHIP_ID_L_REG };
	u8 values[] = { OV5648_CHIP_ID_H_VALUE, OV5648_CHIP_ID_L_VALUE };
	unsigned int i;
	u8 value;
	int ret;

	for (i = 0; i < ARRAY_SIZE(regs); i++) {
		ret = ov5648_read(sensor, regs[i], &value);
		if (ret < 0)
			return ret;

		if (value != values[i]) {
			dev_err(sensor->dev,
				"chip id value mismatch: %#x instead of %#x\n",
				value, values[i]);
			return -EINVAL;
		}
	}

	return 0;
}

static int ov5648_avdd_internal_power(struct ov5648_sensor *sensor, int on)
{
	return ov5648_write(sensor, OV5648_A_PWC_PK_O0_REG,
			    on ? 0 : OV5648_A_PWC_PK_O0_BP_REGULATOR_N);
}

static int ov5648_pad_configure(struct ov5648_sensor *sensor)
{
	int ret;

	/* Configure pads as input. */

	ret = ov5648_write(sensor, OV5648_PAD_OEN1_REG, 0);
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_PAD_OEN2_REG, 0);
	if (ret)
		return ret;

	/* Disable FREX pin. */

	return ov5648_write(sensor, OV5648_PAD_PK_REG,
			    OV5648_PAD_PK_DRIVE_STRENGTH_1X |
			    OV5648_PAD_PK_FREX_N);
}

static int ov5648_mipi_configure(struct ov5648_sensor *sensor)
{
	struct v4l2_mbus_config_mipi_csi2 *bus_mipi_csi2 =
		&sensor->endpoint.bus.mipi_csi2;
	unsigned int lanes_count = bus_mipi_csi2->num_data_lanes;
	int ret;

	ret = ov5648_write(sensor, OV5648_MIPI_CTRL0_REG,
			   OV5648_MIPI_CTRL0_CLK_LANE_AUTOGATE |
			   OV5648_MIPI_CTRL0_LANE_SELECT_LANE1 |
			   OV5648_MIPI_CTRL0_IDLE_LP11);
	if (ret)
		return ret;

	return ov5648_write(sensor, OV5648_MIPI_SC_CTRL0_REG,
			    OV5648_MIPI_SC_CTRL0_MIPI_LANES(lanes_count) |
			    OV5648_MIPI_SC_CTRL0_PHY_LP_RX_PD |
			    OV5648_MIPI_SC_CTRL0_MIPI_EN);
}

static int ov5648_black_level_configure(struct ov5648_sensor *sensor)
{
	int ret;

	/* Up to 6 lines are available for black level calibration. */

	ret = ov5648_write(sensor, OV5648_BLC_CTRL1_REG,
			   OV5648_BLC_CTRL1_START_LINE(2));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_BLC_CTRL2_REG,
			   OV5648_BLC_CTRL2_AUTO_EN |
			   OV5648_BLC_CTRL2_RESET_FRAME_NUM(5));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_BLC_LINE_NUM_REG,
			   OV5648_BLC_LINE_NUM(4));
	if (ret)
		return ret;

	return ov5648_update_bits(sensor, OV5648_BLC_CTRL5_REG,
				  OV5648_BLC_CTRL5_UPDATE_EN,
				  OV5648_BLC_CTRL5_UPDATE_EN);
}

static int ov5648_isp_configure(struct ov5648_sensor *sensor)
{
	u8 bits;
	int ret;

	/* Enable black and white level correction. */
	bits = OV5648_ISP_CTRL0_BLACK_CORRECT_EN |
	       OV5648_ISP_CTRL0_WHITE_CORRECT_EN;

	ret = ov5648_update_bits(sensor, OV5648_ISP_CTRL0_REG, bits, bits);
	if (ret)
		return ret;

	/* Enable AWB. */
	ret = ov5648_write(sensor, OV5648_ISP_CTRL1_REG,
			   OV5648_ISP_CTRL1_AWB_EN);
	if (ret)
		return ret;

	/* Enable AWB gain and windowing. */
	ret = ov5648_write(sensor, OV5648_ISP_CTRL2_REG,
			   OV5648_ISP_CTRL2_WIN_EN |
			   OV5648_ISP_CTRL2_AWB_GAIN_EN);
	if (ret)
		return ret;

	/* Enable buffering and auto-binning. */
	ret = ov5648_write(sensor, OV5648_ISP_CTRL3_REG,
			   OV5648_ISP_CTRL3_BUF_EN |
			   OV5648_ISP_CTRL3_BIN_AUTO_EN);
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_ISP_CTRL4_REG, 0);
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_ISP_CTRL1F_REG,
			   OV5648_ISP_CTRL1F_OUTPUT_EN);
	if (ret)
		return ret;

	/* Enable post-binning filters. */
	ret = ov5648_write(sensor, OV5648_ISP_CTRL4B_REG,
			   OV5648_ISP_CTRL4B_POST_BIN_H_EN |
			   OV5648_ISP_CTRL4B_POST_BIN_V_EN);
	if (ret)
		return ret;

	/* Disable debanding and night mode. Debug bit seems necessary. */
	ret = ov5648_write(sensor, OV5648_AEC_CTRL0_REG,
			   OV5648_AEC_CTRL0_DEBUG |
			   OV5648_AEC_CTRL0_START_SEL_EN);
	if (ret)
		return ret;

	return ov5648_write(sensor, OV5648_MANUAL_CTRL_REG,
			    OV5648_MANUAL_CTRL_FRAME_DELAY(1));
}

static unsigned long ov5648_mode_pll1_rate(struct ov5648_sensor *sensor,
					   const struct ov5648_pll1_config *config)
{
	unsigned long xvclk_rate;
	unsigned long pll1_rate;

	xvclk_rate = clk_get_rate(sensor->xvclk);
	pll1_rate = xvclk_rate * config->pll_mul;

	switch (config->pll_pre_div) {
	case 5:
		pll1_rate *= 3;
		pll1_rate /= 2;
		break;
	case 7:
		pll1_rate *= 5;
		pll1_rate /= 2;
		break;
	default:
		pll1_rate /= config->pll_pre_div;
		break;
	}

	return pll1_rate;
}

static int ov5648_mode_pll1_configure(struct ov5648_sensor *sensor,
				      const struct ov5648_mode *mode,
				      u32 mbus_code)
{
	const struct ov5648_pll1_config *config;
	u8 value;
	int ret;

	value = OV5648_PLL_CTRL0_PLL_CHARGE_PUMP(1);

	switch (mbus_code) {
	case MEDIA_BUS_FMT_SBGGR8_1X8:
		config = mode->pll1_config[0];
		value |= OV5648_PLL_CTRL0_BITS(8);
		break;
	case MEDIA_BUS_FMT_SBGGR10_1X10:
		config = mode->pll1_config[1];
		value |= OV5648_PLL_CTRL0_BITS(10);
		break;
	default:
		return -EINVAL;
	}

	ret = ov5648_write(sensor, OV5648_PLL_CTRL0_REG, value);
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_PLL_DIV_REG,
			   OV5648_PLL_DIV_ROOT_DIV(config->root_div) |
			   OV5648_PLL_DIV_PLL_PRE_DIV(config->pll_pre_div));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_PLL_MUL_REG,
			   OV5648_PLL_MUL(config->pll_mul));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_PLL_CTRL1_REG,
			   OV5648_PLL_CTRL1_SYS_DIV(config->sys_div) |
			   OV5648_PLL_CTRL1_MIPI_DIV(config->mipi_div));
	if (ret)
		return ret;

	return ov5648_write(sensor, OV5648_SRB_CTRL_REG,
			    OV5648_SRB_CTRL_SCLK_DIV(config->sclk_div) |
			    OV5648_SRB_CTRL_SCLK_ARBITER_EN);
}

static int ov5648_mode_pll2_configure(struct ov5648_sensor *sensor,
				      const struct ov5648_mode *mode)
{
	const struct ov5648_pll2_config *config = mode->pll2_config;
	int ret;

	ret = ov5648_write(sensor, OV5648_PLLS_DIV_REG,
			   OV5648_PLLS_DIV_PLLS_PRE_DIV(config->plls_pre_div) |
			   OV5648_PLLS_DIV_PLLS_DIV_R(config->plls_div_r) |
			   OV5648_PLLS_DIV_PLLS_SEL_DIV(config->sel_div));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_PLLS_MUL_REG,
			   OV5648_PLLS_MUL(config->plls_mul));
	if (ret)
		return ret;

	return ov5648_write(sensor, OV5648_PLLS_CTRL_REG,
			    OV5648_PLLS_CTRL_PLL_CHARGE_PUMP(1) |
			    OV5648_PLLS_CTRL_SYS_DIV(config->sys_div));
}

static int ov5648_mode_configure(struct ov5648_sensor *sensor,
				 const struct ov5648_mode *mode, u32 mbus_code)
{
	int ret;

	/* Crop Start X */

	ret = ov5648_write(sensor, OV5648_CROP_START_X_H_REG,
			   OV5648_CROP_START_X_H(mode->crop_start_x));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_CROP_START_X_L_REG,
			   OV5648_CROP_START_X_L(mode->crop_start_x));
	if (ret)
		return ret;

	/* Offset X */

	ret = ov5648_write(sensor, OV5648_OFFSET_X_H_REG,
			   OV5648_OFFSET_X_H(mode->offset_x));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_OFFSET_X_L_REG,
			   OV5648_OFFSET_X_L(mode->offset_x));
	if (ret)
		return ret;

	/* Output Size X */

	ret = ov5648_write(sensor, OV5648_OUTPUT_SIZE_X_H_REG,
			   OV5648_OUTPUT_SIZE_X_H(mode->output_size_x));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_OUTPUT_SIZE_X_L_REG,
			   OV5648_OUTPUT_SIZE_X_L(mode->output_size_x));
	if (ret)
		return ret;

	/* Crop End X */

	ret = ov5648_write(sensor, OV5648_CROP_END_X_H_REG,
			   OV5648_CROP_END_X_H(mode->crop_end_x));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_CROP_END_X_L_REG,
			   OV5648_CROP_END_X_L(mode->crop_end_x));
	if (ret)
		return ret;

	/* Horizontal Total Size */

	ret = ov5648_write(sensor, OV5648_HTS_H_REG, OV5648_HTS_H(mode->hts));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_HTS_L_REG, OV5648_HTS_L(mode->hts));
	if (ret)
		return ret;

	/* Crop Start Y */

	ret = ov5648_write(sensor, OV5648_CROP_START_Y_H_REG,
			   OV5648_CROP_START_Y_H(mode->crop_start_y));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_CROP_START_Y_L_REG,
			   OV5648_CROP_START_Y_L(mode->crop_start_y));
	if (ret)
		return ret;

	/* Offset Y */

	ret = ov5648_write(sensor, OV5648_OFFSET_Y_H_REG,
			   OV5648_OFFSET_Y_H(mode->offset_y));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_OFFSET_Y_L_REG,
			   OV5648_OFFSET_Y_L(mode->offset_y));
	if (ret)
		return ret;

	/* Output Size Y */

	ret = ov5648_write(sensor, OV5648_OUTPUT_SIZE_Y_H_REG,
			   OV5648_OUTPUT_SIZE_Y_H(mode->output_size_y));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_OUTPUT_SIZE_Y_L_REG,
			   OV5648_OUTPUT_SIZE_Y_L(mode->output_size_y));
	if (ret)
		return ret;

	/* Crop End Y */

	ret = ov5648_write(sensor, OV5648_CROP_END_Y_H_REG,
			   OV5648_CROP_END_Y_H(mode->crop_end_y));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_CROP_END_Y_L_REG,
			   OV5648_CROP_END_Y_L(mode->crop_end_y));
	if (ret)
		return ret;

	/* Vertical Total Size */

	ret = ov5648_write(sensor, OV5648_VTS_H_REG, OV5648_VTS_H(mode->vts));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_VTS_L_REG, OV5648_VTS_L(mode->vts));
	if (ret)
		return ret;

	/* Flip/Mirror/Binning */

	/*
	 * A debug bit is enabled by default and needs to be cleared for
	 * subsampling to work.
	 */
	ret = ov5648_update_bits(sensor, OV5648_TC20_REG,
				 OV5648_TC20_DEBUG |
				 OV5648_TC20_BINNING_VERT_EN,
				 mode->binning_y ? OV5648_TC20_BINNING_VERT_EN :
				 0);
	if (ret)
		return ret;

	ret = ov5648_update_bits(sensor, OV5648_TC21_REG,
				 OV5648_TC21_BINNING_HORZ_EN,
				 mode->binning_x ? OV5648_TC21_BINNING_HORZ_EN :
				 0);
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_SUB_INC_X_REG,
			   OV5648_SUB_INC_X_ODD(mode->inc_x_odd) |
			   OV5648_SUB_INC_X_EVEN(mode->inc_x_even));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_SUB_INC_Y_REG,
			   OV5648_SUB_INC_Y_ODD(mode->inc_y_odd) |
			   OV5648_SUB_INC_Y_EVEN(mode->inc_y_even));
	if (ret)
		return ret;

	/* PLLs */

	ret = ov5648_mode_pll1_configure(sensor, mode, mbus_code);
	if (ret)
		return ret;

	ret = ov5648_mode_pll2_configure(sensor, mode);
	if (ret)
		return ret;

	/* Extra registers */

	if (mode->register_values) {
		ret = ov5648_write_sequence(sensor, mode->register_values,
					    mode->register_values_count);
		if (ret)
			return ret;
	}

	return 0;
}

static unsigned long ov5648_mode_mipi_clk_rate(struct ov5648_sensor *sensor,
					       const struct ov5648_mode *mode,
					       u32 mbus_code)
{
	const struct ov5648_pll1_config *config;
	unsigned long pll1_rate;

	switch (mbus_code) {
	case MEDIA_BUS_FMT_SBGGR8_1X8:
		config = mode->pll1_config[0];
		break;
	case MEDIA_BUS_FMT_SBGGR10_1X10:
		config = mode->pll1_config[1];
		break;
	default:
		return 0;
	}

	pll1_rate = ov5648_mode_pll1_rate(sensor, config);

	return pll1_rate / config->sys_div / config->mipi_div / 2;
}

/* Exposure */

static int ov5648_exposure_auto_configure(struct ov5648_sensor *sensor,
					  bool enable)
{
	return ov5648_update_bits(sensor, OV5648_MANUAL_CTRL_REG,
				  OV5648_MANUAL_CTRL_AEC_MANUAL_EN,
				  enable ? 0 : OV5648_MANUAL_CTRL_AEC_MANUAL_EN);
}

static int ov5648_exposure_configure(struct ov5648_sensor *sensor, u32 exposure)
{
	struct ov5648_ctrls *ctrls = &sensor->ctrls;
	int ret;

	if (ctrls->exposure_auto->val != V4L2_EXPOSURE_MANUAL)
		return -EINVAL;

	ret = ov5648_write(sensor, OV5648_EXPOSURE_CTRL_HH_REG,
			   OV5648_EXPOSURE_CTRL_HH(exposure));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_EXPOSURE_CTRL_H_REG,
			   OV5648_EXPOSURE_CTRL_H(exposure));
	if (ret)
		return ret;

	return ov5648_write(sensor, OV5648_EXPOSURE_CTRL_L_REG,
			    OV5648_EXPOSURE_CTRL_L(exposure));
}

static int ov5648_exposure_value(struct ov5648_sensor *sensor,
				 u32 *exposure)
{
	u8 exposure_hh = 0, exposure_h = 0, exposure_l = 0;
	int ret;

	ret = ov5648_read(sensor, OV5648_EXPOSURE_CTRL_HH_REG, &exposure_hh);
	if (ret)
		return ret;

	ret = ov5648_read(sensor, OV5648_EXPOSURE_CTRL_H_REG, &exposure_h);
	if (ret)
		return ret;

	ret = ov5648_read(sensor, OV5648_EXPOSURE_CTRL_L_REG, &exposure_l);
	if (ret)
		return ret;

	*exposure = OV5648_EXPOSURE_CTRL_HH_VALUE((u32)exposure_hh) |
		    OV5648_EXPOSURE_CTRL_H_VALUE((u32)exposure_h) |
		    OV5648_EXPOSURE_CTRL_L_VALUE((u32)exposure_l);

	return 0;
}

/* Gain */

static int ov5648_gain_auto_configure(struct ov5648_sensor *sensor, bool enable)
{
	return ov5648_update_bits(sensor, OV5648_MANUAL_CTRL_REG,
				  OV5648_MANUAL_CTRL_AGC_MANUAL_EN,
				  enable ? 0 : OV5648_MANUAL_CTRL_AGC_MANUAL_EN);
}

static int ov5648_gain_configure(struct ov5648_sensor *sensor, u32 gain)
{
	struct ov5648_ctrls *ctrls = &sensor->ctrls;
	int ret;

	if (ctrls->gain_auto->val)
		return -EINVAL;

	ret = ov5648_write(sensor, OV5648_GAIN_CTRL_H_REG,
			   OV5648_GAIN_CTRL_H(gain));
	if (ret)
		return ret;

	return ov5648_write(sensor, OV5648_GAIN_CTRL_L_REG,
			    OV5648_GAIN_CTRL_L(gain));
}

static int ov5648_gain_value(struct ov5648_sensor *sensor, u32 *gain)
{
	u8 gain_h = 0, gain_l = 0;
	int ret;

	ret = ov5648_read(sensor, OV5648_GAIN_CTRL_H_REG, &gain_h);
	if (ret)
		return ret;

	ret = ov5648_read(sensor, OV5648_GAIN_CTRL_L_REG, &gain_l);
	if (ret)
		return ret;

	*gain = OV5648_GAIN_CTRL_H_VALUE((u32)gain_h) |
		OV5648_GAIN_CTRL_L_VALUE((u32)gain_l);

	return 0;
}

/* White Balance */

static int ov5648_white_balance_auto_configure(struct ov5648_sensor *sensor,
					       bool enable)
{
	return ov5648_write(sensor, OV5648_AWB_CTRL_REG,
			    enable ? 0 : OV5648_AWB_CTRL_GAIN_MANUAL_EN);
}

static int ov5648_white_balance_configure(struct ov5648_sensor *sensor,
					  u32 red_balance, u32 blue_balance)
{
	struct ov5648_ctrls *ctrls = &sensor->ctrls;
	int ret;

	if (ctrls->white_balance_auto->val)
		return -EINVAL;

	ret = ov5648_write(sensor, OV5648_GAIN_RED_MAN_H_REG,
			   OV5648_GAIN_RED_MAN_H(red_balance));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_GAIN_RED_MAN_L_REG,
			   OV5648_GAIN_RED_MAN_L(red_balance));
	if (ret)
		return ret;

	ret = ov5648_write(sensor, OV5648_GAIN_BLUE_MAN_H_REG,
			   OV5648_GAIN_BLUE_MAN_H(blue_balance));
	if (ret)
		return ret;

	return ov5648_write(sensor, OV5648_GAIN_BLUE_MAN_L_REG,
			    OV5648_GAIN_BLUE_MAN_L(blue_balance));
}

/* Flip */

static int ov5648_flip_vert_configure(struct ov5648_sensor *sensor, bool enable)
{
	u8 bits = OV5648_TC20_FLIP_VERT_ISP_EN |
		  OV5648_TC20_FLIP_VERT_SENSOR_EN;

	return ov5648_update_bits(sensor, OV5648_TC20_REG, bits,
				  enable ? bits : 0);
}

static int ov5648_flip_horz_configure(struct ov5648_sensor *sensor, bool enable)
{
	u8 bits = OV5648_TC21_FLIP_HORZ_ISP_EN |
		  OV5648_TC21_FLIP_HORZ_SENSOR_EN;

	return ov5648_update_bits(sensor, OV5648_TC21_REG, bits,
				  enable ? bits : 0);
}

/* Test Pattern */

static int ov5648_test_pattern_configure(struct ov5648_sensor *sensor,
					 unsigned int index)
{
	if (index >= ARRAY_SIZE(ov5648_test_pattern_bits))
		return -EINVAL;

	return ov5648_write(sensor, OV5648_ISP_CTRL3D_REG,
			    ov5648_test_pattern_bits[index]);
}

/* State */

static int ov5648_state_mipi_configure(struct ov5648_sensor *sensor,
				       const struct ov5648_mode *mode,
				       u32 mbus_code)
{
	struct ov5648_ctrls *ctrls = &sensor->ctrls;
	struct v4l2_mbus_config_mipi_csi2 *bus_mipi_csi2 =
		&sensor->endpoint.bus.mipi_csi2;
	unsigned long mipi_clk_rate;
	unsigned int bits_per_sample;
	unsigned int lanes_count;
	unsigned int i, j;
	s64 mipi_pixel_rate;

	mipi_clk_rate = ov5648_mode_mipi_clk_rate(sensor, mode, mbus_code);
	if (!mipi_clk_rate)
		return -EINVAL;

	for (i = 0; i < ARRAY_SIZE(ov5648_link_freq_menu); i++) {
		s64 freq = ov5648_link_freq_menu[i];

		if (freq == mipi_clk_rate)
			break;
	}

	for (j = 0; j < sensor->endpoint.nr_of_link_frequencies; j++) {
		u64 freq = sensor->endpoint.link_frequencies[j];

		if (freq == mipi_clk_rate)
			break;
	}

	if (i == ARRAY_SIZE(ov5648_link_freq_menu)) {
		dev_err(sensor->dev,
			"failed to find %lu clk rate in link freq\n",
			mipi_clk_rate);
	} else if (j == sensor->endpoint.nr_of_link_frequencies) {
		dev_err(sensor->dev,
			"failed to find %lu clk rate in endpoint link-frequencies\n",
			mipi_clk_rate);
	} else {
		__v4l2_ctrl_s_ctrl(ctrls->link_freq, i);
	}

	switch (mbus_code) {
	case MEDIA_BUS_FMT_SBGGR8_1X8:
		bits_per_sample = 8;
		break;
	case MEDIA_BUS_FMT_SBGGR10_1X10:
		bits_per_sample = 10;
		break;
	default:
		return -EINVAL;
	}

	lanes_count = bus_mipi_csi2->num_data_lanes;
	mipi_pixel_rate = mipi_clk_rate * 2 * lanes_count / bits_per_sample;

	__v4l2_ctrl_s_ctrl_int64(ctrls->pixel_rate, mipi_pixel_rate);

	return 0;
}

static int ov5648_state_configure(struct ov5648_sensor *sensor,
				  const struct ov5648_mode *mode,
				  u32 mbus_code)
{
	int ret;

	if (sensor->state.streaming)
		return -EBUSY;

	/* State will be configured at first power on otherwise. */
	if (pm_runtime_enabled(sensor->dev) &&
	    !pm_runtime_suspended(sensor->dev)) {
		ret = ov5648_mode_configure(sensor, mode, mbus_code);
		if (ret)
			return ret;
	}

	ret = ov5648_state_mipi_configure(sensor, mode, mbus_code);
	if (ret)
		return ret;

	sensor->state.mode = mode;
	sensor->state.mbus_code = mbus_code;

	return 0;
}

static int ov5648_state_init(struct ov5648_sensor *sensor)
{
	int ret;

	mutex_lock(&sensor->mutex);
	ret = ov5648_state_configure(sensor, &ov5648_modes[0],
				     ov5648_mbus_codes[0]);
	mutex_unlock(&sensor->mutex);

	return ret;
}

/* Sensor Base */

static int ov5648_sensor_init(struct ov5648_sensor *sensor)
{
	int ret;

	ret = ov5648_sw_reset(sensor);
	if (ret) {
		dev_err(sensor->dev, "failed to perform sw reset\n");
		return ret;
	}

	ret = ov5648_sw_standby(sensor, 1);
	if (ret) {
		dev_err(sensor->dev, "failed to set sensor standby\n");
		return ret;
	}

	ret = ov5648_chip_id_check(sensor);
	if (ret) {
		dev_err(sensor->dev, "failed to check sensor chip id\n");
		return ret;
	}

	ret = ov5648_avdd_internal_power(sensor, !sensor->avdd);
	if (ret) {
		dev_err(sensor->dev, "failed to set internal avdd power\n");
		return ret;
	}

	ret = ov5648_write_sequence(sensor, ov5648_init_sequence,
				    ARRAY_SIZE(ov5648_init_sequence));
	if (ret) {
		dev_err(sensor->dev, "failed to write init sequence\n");
		return ret;
	}

	ret = ov5648_pad_configure(sensor);
	if (ret) {
		dev_err(sensor->dev, "failed to configure pad\n");
		return ret;
	}

	ret = ov5648_mipi_configure(sensor);
	if (ret) {
		dev_err(sensor->dev, "failed to configure MIPI\n");
		return ret;
	}

	ret = ov5648_isp_configure(sensor);
	if (ret) {
		dev_err(sensor->dev, "failed to configure ISP\n");
		return ret;
	}

	ret = ov5648_black_level_configure(sensor);
	if (ret) {
		dev_err(sensor->dev, "failed to configure black level\n");
		return ret;
	}

	/* Configure current mode. */
	ret = ov5648_state_configure(sensor, sensor->state.mode,
				     sensor->state.mbus_code);
	if (ret) {
		dev_err(sensor->dev, "failed to configure state\n");
		return ret;
	}

	return 0;
}

static int ov5648_sensor_power(struct ov5648_sensor *sensor, bool on)
{
	/* Keep initialized to zero for disable label. */
	int ret = 0;

	/*
	 * General notes about the power sequence:
	 * - power-down GPIO must be active (low) during power-on;
	 * - reset GPIO state does not matter during power-on;
	 * - XVCLK must be provided 1 ms before register access;
	 * - 10 ms are needed between power-down deassert and register access.
	 */

	/* Note that regulator-and-GPIO-based power is untested. */
	if (on) {
		gpiod_set_value_cansleep(sensor->reset, 1);
		gpiod_set_value_cansleep(sensor->powerdown, 1);

		ret = regulator_enable(sensor->dovdd);
		if (ret) {
			dev_err(sensor->dev,
				"failed to enable DOVDD regulator\n");
			goto disable;
		}

		if (sensor->avdd) {
			ret = regulator_enable(sensor->avdd);
			if (ret) {
				dev_err(sensor->dev,
					"failed to enable AVDD regulator\n");
				goto disable;
			}
		}

		ret = regulator_enable(sensor->dvdd);
		if (ret) {
			dev_err(sensor->dev,
				"failed to enable DVDD regulator\n");
			goto disable;
		}

		/* According to OV5648 power up diagram. */
		usleep_range(5000, 10000);

		ret = clk_prepare_enable(sensor->xvclk);
		if (ret) {
			dev_err(sensor->dev, "failed to enable XVCLK clock\n");
			goto disable;
		}

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

		usleep_range(20000, 25000);
	} else {
disable:
		gpiod_set_value_cansleep(sensor->powerdown, 1);
		gpiod_set_value_cansleep(sensor->reset, 1);

		clk_disable_unprepare(sensor->xvclk);

		regulator_disable(sensor->dvdd);

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

		regulator_disable(sensor->dovdd);
	}

	return ret;
}

/* Controls */

static int ov5648_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
{
	struct v4l2_subdev *subdev = ov5648_ctrl_subdev(ctrl);
	struct ov5648_sensor *sensor = ov5648_subdev_sensor(subdev);
	struct ov5648_ctrls *ctrls = &sensor->ctrls;
	int ret;

	switch (ctrl->id) {
	case V4L2_CID_EXPOSURE_AUTO:
		ret = ov5648_exposure_value(sensor, &ctrls->exposure->val);
		if (ret)
			return ret;
		break;
	case V4L2_CID_AUTOGAIN:
		ret = ov5648_gain_value(sensor, &ctrls->gain->val);
		if (ret)
			return ret;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int ov5648_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct v4l2_subdev *subdev = ov5648_ctrl_subdev(ctrl);
	struct ov5648_sensor *sensor = ov5648_subdev_sensor(subdev);
	struct ov5648_ctrls *ctrls = &sensor->ctrls;
	unsigned int index;
	bool enable;
	int ret;

	/* Wait for the sensor to be on before setting controls. */
	if (pm_runtime_suspended(sensor->dev))
		return 0;

	switch (ctrl->id) {
	case V4L2_CID_EXPOSURE_AUTO:
		enable = ctrl->val == V4L2_EXPOSURE_AUTO;

		ret = ov5648_exposure_auto_configure(sensor, enable);
		if (ret)
			return ret;

		if (!enable && ctrls->exposure->is_new) {
			ret = ov5648_exposure_configure(sensor,
							ctrls->exposure->val);
			if (ret)
				return ret;
		}
		break;
	case V4L2_CID_AUTOGAIN:
		enable = !!ctrl->val;

		ret = ov5648_gain_auto_configure(sensor, enable);
		if (ret)
			return ret;

		if (!enable) {
			ret = ov5648_gain_configure(sensor, ctrls->gain->val);
			if (ret)
				return ret;
		}
		break;
	case V4L2_CID_AUTO_WHITE_BALANCE:
		enable = !!ctrl->val;

		ret = ov5648_white_balance_auto_configure(sensor, enable);
		if (ret)
			return ret;

		if (!enable) {
			ret = ov5648_white_balance_configure(sensor,
							     ctrls->red_balance->val,
							     ctrls->blue_balance->val);
			if (ret)
				return ret;
		}
		break;
	case V4L2_CID_HFLIP:
		enable = !!ctrl->val;
		return ov5648_flip_horz_configure(sensor, enable);
	case V4L2_CID_VFLIP:
		enable = !!ctrl->val;
		return ov5648_flip_vert_configure(sensor, enable);
	case V4L2_CID_TEST_PATTERN:
		index = (unsigned int)ctrl->val;
		return ov5648_test_pattern_configure(sensor, index);
	default:
		return -EINVAL;
	}

	return 0;
}

static const struct v4l2_ctrl_ops ov5648_ctrl_ops = {
	.g_volatile_ctrl	= ov5648_g_volatile_ctrl,
	.s_ctrl			= ov5648_s_ctrl,
};

static int ov5648_ctrls_init(struct ov5648_sensor *sensor)
{
	struct ov5648_ctrls *ctrls = &sensor->ctrls;
	struct v4l2_ctrl_handler *handler = &ctrls->handler;
	const struct v4l2_ctrl_ops *ops = &ov5648_ctrl_ops;
	int ret;

	v4l2_ctrl_handler_init(handler, 32);

	/* Use our mutex for ctrl locking. */
	handler->lock = &sensor->mutex;

	/* Exposure */

	ctrls->exposure_auto = v4l2_ctrl_new_std_menu(handler, ops,
						      V4L2_CID_EXPOSURE_AUTO,
						      V4L2_EXPOSURE_MANUAL, 0,
						      V4L2_EXPOSURE_AUTO);

	ctrls->exposure = v4l2_ctrl_new_std(handler, ops, V4L2_CID_EXPOSURE,
					    16, 1048575, 16, 512);

	v4l2_ctrl_auto_cluster(2, &ctrls->exposure_auto, 1, true);

	/* Gain */

	ctrls->gain_auto =
		v4l2_ctrl_new_std(handler, ops, V4L2_CID_AUTOGAIN, 0, 1, 1, 1);

	ctrls->gain = v4l2_ctrl_new_std(handler, ops, V4L2_CID_GAIN, 16, 1023,
					16, 16);

	v4l2_ctrl_auto_cluster(2, &ctrls->gain_auto, 0, true);

	/* White Balance */

	ctrls->white_balance_auto =
		v4l2_ctrl_new_std(handler, ops, V4L2_CID_AUTO_WHITE_BALANCE, 0,
				  1, 1, 1);

	ctrls->red_balance = v4l2_ctrl_new_std(handler, ops,
					       V4L2_CID_RED_BALANCE, 0, 4095,
					       1, 1024);

	ctrls->blue_balance = v4l2_ctrl_new_std(handler, ops,
						V4L2_CID_BLUE_BALANCE, 0, 4095,
						1, 1024);

	v4l2_ctrl_auto_cluster(3, &ctrls->white_balance_auto, 0, false);

	/* Flip */

	v4l2_ctrl_new_std(handler, ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
	v4l2_ctrl_new_std(handler, ops, V4L2_CID_VFLIP, 0, 1, 1, 0);

	/* Test Pattern */

	v4l2_ctrl_new_std_menu_items(handler, ops, V4L2_CID_TEST_PATTERN,
				     ARRAY_SIZE(ov5648_test_pattern_menu) - 1,
				     0, 0, ov5648_test_pattern_menu);

	/* MIPI CSI-2 */

	ctrls->link_freq =
		v4l2_ctrl_new_int_menu(handler, NULL, V4L2_CID_LINK_FREQ,
				       ARRAY_SIZE(ov5648_link_freq_menu) - 1,
				       0, ov5648_link_freq_menu);

	ctrls->pixel_rate =
		v4l2_ctrl_new_std(handler, NULL, V4L2_CID_PIXEL_RATE, 1,
				  INT_MAX, 1, 1);

	if (handler->error) {
		ret = handler->error;
		goto error_ctrls;
	}

	ctrls->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE;
	ctrls->gain->flags |= V4L2_CTRL_FLAG_VOLATILE;

	ctrls->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY;
	ctrls->pixel_rate->flags |= V4L2_CTRL_FLAG_READ_ONLY;

	sensor->subdev.ctrl_handler = handler;

	return 0;

error_ctrls:
	v4l2_ctrl_handler_free(handler);

	return ret;
}

/* Subdev Video Operations */

static int ov5648_s_stream(struct v4l2_subdev *subdev, int enable)
{
	struct ov5648_sensor *sensor = ov5648_subdev_sensor(subdev);
	struct ov5648_state *state = &sensor->state;
	int ret;

	if (enable) {
		ret = pm_runtime_resume_and_get(sensor->dev);
		if (ret < 0)
			return ret;
	}

	mutex_lock(&sensor->mutex);
	ret = ov5648_sw_standby(sensor, !enable);
	mutex_unlock(&sensor->mutex);

	if (ret)
		return ret;

	state->streaming = !!enable;

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

	return 0;
}

static int ov5648_g_frame_interval(struct v4l2_subdev *subdev,
				   struct v4l2_subdev_frame_interval *interval)
{
	struct ov5648_sensor *sensor = ov5648_subdev_sensor(subdev);
	const struct ov5648_mode *mode;
	int ret = 0;

	mutex_lock(&sensor->mutex);

	mode = sensor->state.mode;

	switch (sensor->state.mbus_code) {
	case MEDIA_BUS_FMT_SBGGR8_1X8:
		interval->interval = mode->frame_interval[0];
		break;
	case MEDIA_BUS_FMT_SBGGR10_1X10:
		interval->interval = mode->frame_interval[1];
		break;
	default:
		ret = -EINVAL;
	}

	mutex_unlock(&sensor->mutex);

	return ret;
}

static const struct v4l2_subdev_video_ops ov5648_subdev_video_ops = {
	.s_stream		= ov5648_s_stream,
	.g_frame_interval	= ov5648_g_frame_interval,
	.s_frame_interval	= ov5648_g_frame_interval,
};

/* Subdev Pad Operations */

static int ov5648_enum_mbus_code(struct v4l2_subdev *subdev,
				 struct v4l2_subdev_state *sd_state,
				 struct v4l2_subdev_mbus_code_enum *code_enum)
{
	if (code_enum->index >= ARRAY_SIZE(ov5648_mbus_codes))
		return -EINVAL;

	code_enum->code = ov5648_mbus_codes[code_enum->index];

	return 0;
}

static void ov5648_mbus_format_fill(struct v4l2_mbus_framefmt *mbus_format,
				    u32 mbus_code,
				    const struct ov5648_mode *mode)
{
	mbus_format->width = mode->output_size_x;
	mbus_format->height = mode->output_size_y;
	mbus_format->code = mbus_code;

	mbus_format->field = V4L2_FIELD_NONE;
	mbus_format->colorspace = V4L2_COLORSPACE_RAW;
	mbus_format->ycbcr_enc =
		V4L2_MAP_YCBCR_ENC_DEFAULT(mbus_format->colorspace);
	mbus_format->quantization = V4L2_QUANTIZATION_FULL_RANGE;
	mbus_format->xfer_func =
		V4L2_MAP_XFER_FUNC_DEFAULT(mbus_format->colorspace);
}

static int ov5648_get_fmt(struct v4l2_subdev *subdev,
			  struct v4l2_subdev_state *sd_state,
			  struct v4l2_subdev_format *format)
{
	struct ov5648_sensor *sensor = ov5648_subdev_sensor(subdev);
	struct v4l2_mbus_framefmt *mbus_format = &format->format;

	mutex_lock(&sensor->mutex);

	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
		*mbus_format = *v4l2_subdev_get_try_format(subdev, sd_state,
							   format->pad);
	else
		ov5648_mbus_format_fill(mbus_format, sensor->state.mbus_code,
					sensor->state.mode);

	mutex_unlock(&sensor->mutex);

	return 0;
}

static int ov5648_set_fmt(struct v4l2_subdev *subdev,
			  struct v4l2_subdev_state *sd_state,
			  struct v4l2_subdev_format *format)
{
	struct ov5648_sensor *sensor = ov5648_subdev_sensor(subdev);
	struct v4l2_mbus_framefmt *mbus_format = &format->format;
	const struct ov5648_mode *mode;
	u32 mbus_code = 0;
	unsigned int index;
	int ret = 0;

	mutex_lock(&sensor->mutex);

	if (sensor->state.streaming) {
		ret = -EBUSY;
		goto complete;
	}

	/* Try to find requested mbus code. */
	for (index = 0; index < ARRAY_SIZE(ov5648_mbus_codes); index++) {
		if (ov5648_mbus_codes[index] == mbus_format->code) {
			mbus_code = mbus_format->code;
			break;
		}
	}

	/* Fallback to default. */
	if (!mbus_code)
		mbus_code = ov5648_mbus_codes[0];

	/* Find the mode with nearest dimensions. */
	mode = v4l2_find_nearest_size(ov5648_modes, ARRAY_SIZE(ov5648_modes),
				      output_size_x, output_size_y,
				      mbus_format->width, mbus_format->height);
	if (!mode) {
		ret = -EINVAL;
		goto complete;
	}

	ov5648_mbus_format_fill(mbus_format, mbus_code, mode);

	if (format->which == V4L2_SUBDEV_FORMAT_TRY)
		*v4l2_subdev_get_try_format(subdev, sd_state, format->pad) =
			*mbus_format;
	else if (sensor->state.mode != mode ||
		 sensor->state.mbus_code != mbus_code)
		ret = ov5648_state_configure(sensor, mode, mbus_code);

complete:
	mutex_unlock(&sensor->mutex);

	return ret;
}

static int ov5648_enum_frame_size(struct v4l2_subdev *subdev,
				  struct v4l2_subdev_state *sd_state,
				  struct v4l2_subdev_frame_size_enum *size_enum)
{
	const struct ov5648_mode *mode;

	if (size_enum->index >= ARRAY_SIZE(ov5648_modes))
		return -EINVAL;

	mode = &ov5648_modes[size_enum->index];

	size_enum->min_width = size_enum->max_width = mode->output_size_x;
	size_enum->min_height = size_enum->max_height = mode->output_size_y;

	return 0;
}

static int ov5648_enum_frame_interval(struct v4l2_subdev *subdev,
				      struct v4l2_subdev_state *sd_state,
				      struct v4l2_subdev_frame_interval_enum *interval_enum)
{
	const struct ov5648_mode *mode = NULL;
	unsigned int mode_index;
	unsigned int interval_index;

	if (interval_enum->index > 0)
		return -EINVAL;

	/*
	 * Multiple modes with the same dimensions may have different frame
	 * intervals, so look up each relevant mode.
	 */
	for (mode_index = 0, interval_index = 0;
	     mode_index < ARRAY_SIZE(ov5648_modes); mode_index++) {
		mode = &ov5648_modes[mode_index];

		if (mode->output_size_x == interval_enum->width &&
		    mode->output_size_y == interval_enum->height) {
			if (interval_index == interval_enum->index)
				break;

			interval_index++;
		}
	}

	if (mode_index == ARRAY_SIZE(ov5648_modes))
		return -EINVAL;

	switch (interval_enum->code) {
	case MEDIA_BUS_FMT_SBGGR8_1X8:
		interval_enum->interval = mode->frame_interval[0];
		break;
	case MEDIA_BUS_FMT_SBGGR10_1X10:
		interval_enum->interval = mode->frame_interval[1];
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static const struct v4l2_subdev_pad_ops ov5648_subdev_pad_ops = {
	.enum_mbus_code		= ov5648_enum_mbus_code,
	.get_fmt		= ov5648_get_fmt,
	.set_fmt		= ov5648_set_fmt,
	.enum_frame_size	= ov5648_enum_frame_size,
	.enum_frame_interval	= ov5648_enum_frame_interval,
};

static const struct v4l2_subdev_ops ov5648_subdev_ops = {
	.video		= &ov5648_subdev_video_ops,
	.pad		= &ov5648_subdev_pad_ops,
};

static int ov5648_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct ov5648_sensor *sensor = ov5648_subdev_sensor(subdev);
	struct ov5648_state *state = &sensor->state;
	int ret = 0;

	mutex_lock(&sensor->mutex);

	if (state->streaming) {
		ret = ov5648_sw_standby(sensor, true);
		if (ret)
			goto complete;
	}

	ret = ov5648_sensor_power(sensor, false);
	if (ret)
		ov5648_sw_standby(sensor, false);

complete:
	mutex_unlock(&sensor->mutex);

	return ret;
}

static int ov5648_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct ov5648_sensor *sensor = ov5648_subdev_sensor(subdev);
	struct ov5648_state *state = &sensor->state;
	int ret = 0;

	mutex_lock(&sensor->mutex);

	ret = ov5648_sensor_power(sensor, true);
	if (ret)
		goto complete;

	ret = ov5648_sensor_init(sensor);
	if (ret)
		goto error_power;

	ret = __v4l2_ctrl_handler_setup(&sensor->ctrls.handler);
	if (ret)
		goto error_power;

	if (state->streaming) {
		ret = ov5648_sw_standby(sensor, false);
		if (ret)
			goto error_power;
	}

	goto complete;

error_power:
	ov5648_sensor_power(sensor, false);

complete:
	mutex_unlock(&sensor->mutex);

	return ret;
}

static int ov5648_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct fwnode_handle *handle;
	struct ov5648_sensor *sensor;
	struct v4l2_subdev *subdev;
	struct media_pad *pad;
	unsigned long rate;
	int ret;

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

	sensor->dev = dev;
	sensor->i2c_client = client;

	/* Graph Endpoint */

	handle = fwnode_graph_get_next_endpoint(dev_fwnode(dev), NULL);
	if (!handle) {
		dev_err(dev, "unable to find endpoint node\n");
		return -EINVAL;
	}

	sensor->endpoint.bus_type = V4L2_MBUS_CSI2_DPHY;

	ret = v4l2_fwnode_endpoint_alloc_parse(handle, &sensor->endpoint);
	fwnode_handle_put(handle);
	if (ret) {
		dev_err(dev, "failed to parse endpoint node\n");
		return ret;
	}

	/* GPIOs */

	sensor->powerdown = devm_gpiod_get_optional(dev, "powerdown",
						    GPIOD_OUT_HIGH);
	if (IS_ERR(sensor->powerdown)) {
		ret = PTR_ERR(sensor->powerdown);
		goto error_endpoint;
	}

	sensor->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(sensor->reset)) {
		ret = PTR_ERR(sensor->reset);
		goto error_endpoint;
	}

	/* Regulators */

	/* DVDD: digital core */
	sensor->dvdd = devm_regulator_get(dev, "dvdd");
	if (IS_ERR(sensor->dvdd)) {
		dev_err(dev, "cannot get DVDD (digital core) regulator\n");
		ret = PTR_ERR(sensor->dvdd);
		goto error_endpoint;
	}

	/* DOVDD: digital I/O */
	sensor->dovdd = devm_regulator_get(dev, "dovdd");
	if (IS_ERR(sensor->dovdd)) {
		dev_err(dev, "cannot get DOVDD (digital I/O) regulator\n");
		ret = PTR_ERR(sensor->dovdd);
		goto error_endpoint;
	}

	/* AVDD: analog */
	sensor->avdd = devm_regulator_get_optional(dev, "avdd");
	if (IS_ERR(sensor->avdd)) {
		dev_info(dev, "no AVDD regulator provided, using internal\n");
		sensor->avdd = NULL;
	}

	/* External Clock */

	sensor->xvclk = devm_clk_get(dev, NULL);
	if (IS_ERR(sensor->xvclk)) {
		dev_err(dev, "failed to get external clock\n");
		ret = PTR_ERR(sensor->xvclk);
		goto error_endpoint;
	}

	rate = clk_get_rate(sensor->xvclk);
	if (rate != OV5648_XVCLK_RATE) {
		dev_err(dev, "clock rate %lu Hz is unsupported\n", rate);
		ret = -EINVAL;
		goto error_endpoint;
	}

	/* Subdev, entity and pad */

	subdev = &sensor->subdev;
	v4l2_i2c_subdev_init(subdev, client, &ov5648_subdev_ops);

	subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
	subdev->entity.function = MEDIA_ENT_F_CAM_SENSOR;

	pad = &sensor->pad;
	pad->flags = MEDIA_PAD_FL_SOURCE;

	ret = media_entity_pads_init(&subdev->entity, 1, pad);
	if (ret)
		goto error_entity;

	/* Mutex */

	mutex_init(&sensor->mutex);

	/* Sensor */

	ret = ov5648_ctrls_init(sensor);
	if (ret)
		goto error_mutex;

	ret = ov5648_state_init(sensor);
	if (ret)
		goto error_ctrls;

	/* Runtime PM */

	pm_runtime_enable(sensor->dev);
	pm_runtime_set_suspended(sensor->dev);

	/* V4L2 subdev register */

	ret = v4l2_async_register_subdev_sensor(subdev);
	if (ret)
		goto error_pm;

	return 0;

error_pm:
	pm_runtime_disable(sensor->dev);

error_ctrls:
	v4l2_ctrl_handler_free(&sensor->ctrls.handler);

error_mutex:
	mutex_destroy(&sensor->mutex);

error_entity:
	media_entity_cleanup(&sensor->subdev.entity);

error_endpoint:
	v4l2_fwnode_endpoint_free(&sensor->endpoint);

	return ret;
}

static void ov5648_remove(struct i2c_client *client)
{
	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
	struct ov5648_sensor *sensor = ov5648_subdev_sensor(subdev);

	v4l2_async_unregister_subdev(subdev);
	pm_runtime_disable(sensor->dev);
	v4l2_ctrl_handler_free(&sensor->ctrls.handler);
	mutex_destroy(&sensor->mutex);
	media_entity_cleanup(&subdev->entity);
	v4l2_fwnode_endpoint_free(&sensor->endpoint);
}

static const struct dev_pm_ops ov5648_pm_ops = {
	SET_RUNTIME_PM_OPS(ov5648_suspend, ov5648_resume, NULL)
};

static const struct of_device_id ov5648_of_match[] = {
	{ .compatible = "ovti,ov5648" },
	{ }
};
MODULE_DEVICE_TABLE(of, ov5648_of_match);

static struct i2c_driver ov5648_driver = {
	.driver = {
		.name = "ov5648",
		.of_match_table = ov5648_of_match,
		.pm = &ov5648_pm_ops,
	},
	.probe_new = ov5648_probe,
	.remove	 = ov5648_remove,
};

module_i2c_driver(ov5648_driver);

MODULE_AUTHOR("Paul Kocialkowski <paul.kocialkowski@bootlin.com>");
MODULE_DESCRIPTION("V4L2 driver for the OmniVision OV5648 image sensor");
MODULE_LICENSE("GPL v2");