// SPDX-License-Identifier: GPL-2.0-only
/*
 * Sony imx335 Camera Sensor Driver
 *
 * Copyright (C) 2021 Intel Corporation
 */
#include <linux/unaligned.h>

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>

#include <media/v4l2-cci.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-subdev.h>

/* Streaming Mode */
#define IMX335_REG_MODE_SELECT          CCI_REG8(0x3000)
#define IMX335_MODE_STANDBY             0x01
#define IMX335_MODE_STREAMING           0x00

/* Group hold register */
#define IMX335_REG_HOLD                 CCI_REG8(0x3001)

#define IMX335_REG_MASTER_MODE          CCI_REG8(0x3002)
#define IMX335_REG_BCWAIT_TIME          CCI_REG8(0x300c)
#define IMX335_REG_CPWAIT_TIME          CCI_REG8(0x300d)
#define IMX335_REG_WINMODE              CCI_REG8(0x3018)
#define IMX335_REG_HTRIMMING_START      CCI_REG16_LE(0x302c)
#define IMX335_REG_HNUM                 CCI_REG16_LE(0x302e)

/* Lines per frame */
#define IMX335_REG_VMAX                 CCI_REG24_LE(0x3030)
#define IMX335_REG_HMAX                 CCI_REG16_LE(0x3034)

#define IMX335_REG_OPB_SIZE_V           CCI_REG8(0x304c)
#define IMX335_REG_ADBIT                CCI_REG8(0x3050)
#define IMX335_REG_Y_OUT_SIZE           CCI_REG16_LE(0x3056)

#define IMX335_REG_SHUTTER              CCI_REG24_LE(0x3058)
#define IMX335_EXPOSURE_MIN             1
#define IMX335_SHUTTER_MIN              9
#define IMX335_SHUTTER_MIN_BINNED       17
#define IMX335_EXPOSURE_STEP            1
#define IMX335_EXPOSURE_DEFAULT         0x0648

#define IMX335_REG_AREA2_WIDTH_1        CCI_REG16_LE(0x3072)

#define IMX335_REG_AREA3_ST_ADR_1       CCI_REG16_LE(0x3074)
#define IMX335_REG_AREA3_WIDTH_1        CCI_REG16_LE(0x3076)

/* Analog and Digital gain control */
#define IMX335_REG_GAIN                 CCI_REG8(0x30e8)
#define IMX335_AGAIN_MIN                0
#define IMX335_AGAIN_MAX                100
#define IMX335_AGAIN_STEP               1
#define IMX335_AGAIN_DEFAULT            0

/* Vertical flip */
#define IMX335_REG_VREVERSE             CCI_REG8(0x304f)

#define IMX335_REG_TPG_TESTCLKEN        CCI_REG8(0x3148)

#define IMX335_REG_INCLKSEL1            CCI_REG16_LE(0x314c)
#define IMX335_REG_INCLKSEL2            CCI_REG8(0x315a)
#define IMX335_REG_INCLKSEL3            CCI_REG8(0x3168)
#define IMX335_REG_INCLKSEL4            CCI_REG8(0x316a)

#define IMX335_REG_MDBIT                CCI_REG8(0x319d)
#define IMX335_REG_SYSMODE              CCI_REG8(0x319e)

#define IMX335_REG_XVS_XHS_DRV          CCI_REG8(0x31a1)

/* Test pattern generator */
#define IMX335_REG_TPG_DIG_CLP_MODE     CCI_REG8(0x3280)
#define IMX335_REG_TPG_EN_DUOUT         CCI_REG8(0x329c)
#define IMX335_REG_TPG                  CCI_REG8(0x329e)
#define IMX335_TPG_ALL_000              0
#define IMX335_TPG_ALL_FFF              1
#define IMX335_TPG_ALL_555              2
#define IMX335_TPG_ALL_AAA              3
#define IMX335_TPG_TOG_555_AAA          4
#define IMX335_TPG_TOG_AAA_555          5
#define IMX335_TPG_TOG_000_555          6
#define IMX335_TPG_TOG_555_000          7
#define IMX335_TPG_TOG_000_FFF          8
#define IMX335_TPG_TOG_FFF_000          9
#define IMX335_TPG_H_COLOR_BARS         10
#define IMX335_TPG_V_COLOR_BARS         11
#define IMX335_REG_TPG_COLORWIDTH       CCI_REG8(0x32a0)

#define IMX335_REG_BLKLEVEL             CCI_REG16_LE(0x3302)

#define IMX335_REG_WRJ_OPEN             CCI_REG8(0x336c)

#define IMX335_REG_ADBIT1               CCI_REG16_LE(0x341c)

/* Chip ID */
#define IMX335_REG_ID                   CCI_REG8(0x3912)
#define IMX335_ID                       0x00

/* Data Lanes */
#define IMX335_REG_LANEMODE             CCI_REG8(0x3a01)
#define IMX335_2LANE                    1
#define IMX335_4LANE                    3

#define IMX335_REG_TCLKPOST             CCI_REG16_LE(0x3a18)
#define IMX335_REG_TCLKPREPARE          CCI_REG16_LE(0x3a1a)
#define IMX335_REG_TCLK_TRAIL           CCI_REG16_LE(0x3a1c)
#define IMX335_REG_TCLK_ZERO            CCI_REG16_LE(0x3a1e)
#define IMX335_REG_THS_PREPARE          CCI_REG16_LE(0x3a20)
#define IMX335_REG_THS_ZERO             CCI_REG16_LE(0x3a22)
#define IMX335_REG_THS_TRAIL            CCI_REG16_LE(0x3a24)
#define IMX335_REG_THS_EXIT             CCI_REG16_LE(0x3a26)
#define IMX335_REG_TPLX                 CCI_REG16_LE(0x3a28)

/* Input clock rate */
#define IMX335_INCLK_RATE               24000000

/* CSI2 HW configuration */
#define IMX335_LINK_FREQ_594MHz         594000000LL
#define IMX335_LINK_FREQ_445MHz         445500000LL

#define IMX335_NUM_DATA_LANES   4

/* IMX335 native and active pixel array size. */
static const struct v4l2_rect imx335_native_area = {
        .top = 0,
        .left = 0,
        .width = 2696,
        .height = 2044,
};

static const struct v4l2_rect imx335_active_area = {
        .top = 50,
        .left = 36,
        .width = 2624,
        .height = 1944,
};

/**
 * struct imx335_reg_list - imx335 sensor register list
 * @num_of_regs: Number of registers in the list
 * @regs: Pointer to register list
 */
struct imx335_reg_list {
        u32 num_of_regs;
        const struct cci_reg_sequence *regs;
};

static const char * const imx335_supply_name[] = {
        "avdd", /* Analog (2.9V) supply */
        "ovdd", /* Digital I/O (1.8V) supply */
        "dvdd", /* Digital Core (1.2V) supply */
};

enum imx335_scan_mode {
        IMX335_ALL_PIXEL,
        IMX335_2_2_BINNING,
};

/**
 * struct imx335_mode - imx335 sensor mode structure
 * @scan_mode: Configuration scan mode (All pixel / 2x2Binning)
 * @width: Frame width
 * @height: Frame height
 * @code: Format code
 * @hblank: Horizontal blanking in lines
 * @vblank: Vertical blanking in lines
 * @vblank_min: Minimum vertical blanking in lines
 * @vblank_max: Maximum vertical blanking in lines
 * @pclk: Sensor pixel clock
 * @reg_list: Register list for sensor mode
 * @vflip_normal: Register list vflip (normal readout)
 * @vflip_inverted: Register list vflip (inverted readout)
 */
struct imx335_mode {
        enum imx335_scan_mode scan_mode;
        u32 width;
        u32 height;
        u32 code;
        u32 hblank;
        u32 vblank;
        u32 vblank_min;
        u32 vblank_max;
        u64 pclk;
        struct imx335_reg_list reg_list;
        struct imx335_reg_list vflip_normal;
        struct imx335_reg_list vflip_inverted;
};

/**
 * struct imx335 - imx335 sensor device structure
 * @dev: Pointer to generic device
 * @client: Pointer to i2c client
 * @sd: V4L2 sub-device
 * @pad: Media pad. Only one pad supported
 * @reset_gpio: Sensor reset gpio
 * @supplies: Regulator supplies to handle power control
 * @cci: CCI register map
 * @inclk: Sensor input clock
 * @ctrl_handler: V4L2 control handler
 * @link_freq_ctrl: Pointer to link frequency control
 * @pclk_ctrl: Pointer to pixel clock control
 * @hblank_ctrl: Pointer to horizontal blanking control
 * @vblank_ctrl: Pointer to vertical blanking control
 * @vflip: Pointer to vertical flip control
 * @exp_ctrl: Pointer to exposure control
 * @again_ctrl: Pointer to analog gain control
 * @vblank: Vertical blanking in lines
 * @lane_mode: Mode for number of connected data lanes
 * @cur_mode: Pointer to current selected sensor mode
 * @link_freq_bitmap: Menu bitmap for link_freq_ctrl
 * @cur_mbus_code: Currently selected media bus format code
 */
struct imx335 {
        struct device *dev;
        struct i2c_client *client;
        struct v4l2_subdev sd;
        struct media_pad pad;
        struct gpio_desc *reset_gpio;
        struct regulator_bulk_data supplies[ARRAY_SIZE(imx335_supply_name)];
        struct regmap *cci;

        struct clk *inclk;
        struct v4l2_ctrl_handler ctrl_handler;
        struct v4l2_ctrl *link_freq_ctrl;
        struct v4l2_ctrl *pclk_ctrl;
        struct v4l2_ctrl *hblank_ctrl;
        struct v4l2_ctrl *vblank_ctrl;
        struct v4l2_ctrl *vflip;
        struct {
                struct v4l2_ctrl *exp_ctrl;
                struct v4l2_ctrl *again_ctrl;
        };
        u32 vblank;
        u32 lane_mode;
        const struct imx335_mode *cur_mode;
        unsigned long link_freq_bitmap;
        u32 cur_mbus_code;
};

static const char * const imx335_tpg_menu[] = {
        "Disabled",
        "All 000h",
        "All FFFh",
        "All 555h",
        "All AAAh",
        "Toggle 555/AAAh",
        "Toggle AAA/555h",
        "Toggle 000/555h",
        "Toggle 555/000h",
        "Toggle 000/FFFh",
        "Toggle FFF/000h",
        "Horizontal color bars",
        "Vertical color bars",
};

static const int imx335_tpg_val[] = {
        IMX335_TPG_ALL_000,
        IMX335_TPG_ALL_000,
        IMX335_TPG_ALL_FFF,
        IMX335_TPG_ALL_555,
        IMX335_TPG_ALL_AAA,
        IMX335_TPG_TOG_555_AAA,
        IMX335_TPG_TOG_AAA_555,
        IMX335_TPG_TOG_000_555,
        IMX335_TPG_TOG_555_000,
        IMX335_TPG_TOG_000_FFF,
        IMX335_TPG_TOG_FFF_000,
        IMX335_TPG_H_COLOR_BARS,
        IMX335_TPG_V_COLOR_BARS,
};

/* Sensor mode registers */
static const struct cci_reg_sequence mode_2592x1944_regs[] = {
        { IMX335_REG_MODE_SELECT, IMX335_MODE_STANDBY },
        { IMX335_REG_MASTER_MODE, 0x00 },
        { IMX335_REG_WINMODE, 0x04 },
        { IMX335_REG_HMAX, 550 },
        { IMX335_REG_HTRIMMING_START, 48 },
        { IMX335_REG_HNUM, 2592 },
        { IMX335_REG_Y_OUT_SIZE, 1944 },
        { IMX335_REG_AREA2_WIDTH_1, 40 },
        { IMX335_REG_AREA3_WIDTH_1, 3928 },
        { IMX335_REG_OPB_SIZE_V, 0 },
        { IMX335_REG_XVS_XHS_DRV, 0x00 },
};

static const struct cci_reg_sequence mode_1312x972_regs[] = {
        { IMX335_REG_MODE_SELECT, IMX335_MODE_STANDBY },
        { IMX335_REG_MASTER_MODE, 0x00 },
        { IMX335_REG_WINMODE, 0x01 },
        { IMX335_REG_HMAX, 275 },
        { IMX335_REG_HTRIMMING_START, 48 },
        { IMX335_REG_HNUM, 2600 },
        { IMX335_REG_Y_OUT_SIZE, 972 },
        { IMX335_REG_AREA2_WIDTH_1, 48 },
        { IMX335_REG_AREA3_WIDTH_1, 3936 },
        { IMX335_REG_OPB_SIZE_V, 0 },
        { IMX335_REG_XVS_XHS_DRV, 0x00 },
        { CCI_REG8(0x3300), 1 }, /* TCYCLE */
        { CCI_REG8(0x3199), 0x30 }, /* HADD/VADD */
};

static const struct cci_reg_sequence imx335_common_regs[] = {
        { CCI_REG8(0x3288), 0x21 },
        { CCI_REG8(0x328a), 0x02 },
        { CCI_REG8(0x3414), 0x05 },
        { CCI_REG8(0x3416), 0x18 },
        { CCI_REG8(0x3648), 0x01 },
        { CCI_REG8(0x364a), 0x04 },
        { CCI_REG8(0x364c), 0x04 },
        { CCI_REG8(0x3678), 0x01 },
        { CCI_REG8(0x367c), 0x31 },
        { CCI_REG8(0x367e), 0x31 },
        { CCI_REG8(0x3706), 0x10 },
        { CCI_REG8(0x3708), 0x03 },
        { CCI_REG8(0x3714), 0x02 },
        { CCI_REG8(0x3715), 0x02 },
        { CCI_REG8(0x3716), 0x01 },
        { CCI_REG8(0x3717), 0x03 },
        { CCI_REG8(0x371c), 0x3d },
        { CCI_REG8(0x371d), 0x3f },
        { CCI_REG8(0x372c), 0x00 },
        { CCI_REG8(0x372d), 0x00 },
        { CCI_REG8(0x372e), 0x46 },
        { CCI_REG8(0x372f), 0x00 },
        { CCI_REG8(0x3730), 0x89 },
        { CCI_REG8(0x3731), 0x00 },
        { CCI_REG8(0x3732), 0x08 },
        { CCI_REG8(0x3733), 0x01 },
        { CCI_REG8(0x3734), 0xfe },
        { CCI_REG8(0x3735), 0x05 },
        { CCI_REG8(0x3740), 0x02 },
        { CCI_REG8(0x375d), 0x00 },
        { CCI_REG8(0x375e), 0x00 },
        { CCI_REG8(0x375f), 0x11 },
        { CCI_REG8(0x3760), 0x01 },
        { CCI_REG8(0x3768), 0x1b },
        { CCI_REG8(0x3769), 0x1b },
        { CCI_REG8(0x376a), 0x1b },
        { CCI_REG8(0x376b), 0x1b },
        { CCI_REG8(0x376c), 0x1a },
        { CCI_REG8(0x376d), 0x17 },
        { CCI_REG8(0x376e), 0x0f },
        { CCI_REG8(0x3776), 0x00 },
        { CCI_REG8(0x3777), 0x00 },
        { CCI_REG8(0x3778), 0x46 },
        { CCI_REG8(0x3779), 0x00 },
        { CCI_REG8(0x377a), 0x89 },
        { CCI_REG8(0x377b), 0x00 },
        { CCI_REG8(0x377c), 0x08 },
        { CCI_REG8(0x377d), 0x01 },
        { CCI_REG8(0x377e), 0x23 },
        { CCI_REG8(0x377f), 0x02 },
        { CCI_REG8(0x3780), 0xd9 },
        { CCI_REG8(0x3781), 0x03 },
        { CCI_REG8(0x3782), 0xf5 },
        { CCI_REG8(0x3783), 0x06 },
        { CCI_REG8(0x3784), 0xa5 },
        { CCI_REG8(0x3788), 0x0f },
        { CCI_REG8(0x378a), 0xd9 },
        { CCI_REG8(0x378b), 0x03 },
        { CCI_REG8(0x378c), 0xeb },
        { CCI_REG8(0x378d), 0x05 },
        { CCI_REG8(0x378e), 0x87 },
        { CCI_REG8(0x378f), 0x06 },
        { CCI_REG8(0x3790), 0xf5 },
        { CCI_REG8(0x3792), 0x43 },
        { CCI_REG8(0x3794), 0x7a },
        { CCI_REG8(0x3796), 0xa1 },
        { CCI_REG8(0x37b0), 0x36 },
        { CCI_REG8(0x3a00), 0x00 },
};

static const struct cci_reg_sequence mode_2592x1944_vflip_normal[] = {
        { IMX335_REG_AREA3_ST_ADR_1, 176 },

        /* Undocumented V-Flip related registers on Page 55 of datasheet. */
        { CCI_REG8(0x3081), 0x02, },
        { CCI_REG8(0x3083), 0x02, },
        { CCI_REG16_LE(0x30b6), 0x00 },
        { CCI_REG16_LE(0x3116), 0x08 },
};

static const struct cci_reg_sequence mode_2592x1944_vflip_inverted[] = {
        { IMX335_REG_AREA3_ST_ADR_1, 4112 },

        /* Undocumented V-Flip related registers on Page 55 of datasheet. */
        { CCI_REG8(0x3081), 0xfe, },
        { CCI_REG8(0x3083), 0xfe, },
        { CCI_REG16_LE(0x30b6), 0x1fa },
        { CCI_REG16_LE(0x3116), 0x002 },
};

static const struct cci_reg_sequence mode_1312x972_vflip_normal[] = {
        { IMX335_REG_AREA3_ST_ADR_1, 176 },

        /* Undocumented */
        { CCI_REG8(0x3078), 0x04 },
        { CCI_REG8(0x3079), 0xfd },
        { CCI_REG8(0x307a), 0x04 },
        { CCI_REG8(0x307b), 0xfe },
        { CCI_REG8(0x307c), 0x04 },
        { CCI_REG8(0x307d), 0xfb },
        { CCI_REG8(0x307e), 0x04 },
        { CCI_REG8(0x307f), 0x02 },
        { CCI_REG8(0x3080), 0x04 },
        { CCI_REG8(0x3081), 0xfd },
        { CCI_REG8(0x3082), 0x04 },
        { CCI_REG8(0x3083), 0xfe },
        { CCI_REG8(0x3084), 0x04 },
        { CCI_REG8(0x3085), 0xfb },
        { CCI_REG8(0x3086), 0x04 },
        { CCI_REG8(0x3087), 0x02 },
        { CCI_REG8(0x30a4), 0x77 },
        { CCI_REG8(0x30a8), 0x20 },
        { CCI_REG8(0x30a9), 0x00 },
        { CCI_REG8(0x30ac), 0x08 },
        { CCI_REG8(0x30ad), 0x08 },
        { CCI_REG8(0x30b0), 0x20 },
        { CCI_REG8(0x30b1), 0x00 },
        { CCI_REG8(0x30b4), 0x10 },
        { CCI_REG8(0x30b5), 0x10 },
        { CCI_REG16_LE(0x30b6), 0x00 },
        { CCI_REG16_LE(0x3112), 0x10 },
        { CCI_REG16_LE(0x3116), 0x10 },
};

static const struct cci_reg_sequence mode_1312x972_vflip_inverted[] = {
        { IMX335_REG_AREA3_ST_ADR_1, 4112 },

        /* Undocumented */
        { CCI_REG8(0x3078), 0x04 },
        { CCI_REG8(0x3079), 0xfd },
        { CCI_REG8(0x307a), 0x04 },
        { CCI_REG8(0x307b), 0xfe },
        { CCI_REG8(0x307c), 0x04 },
        { CCI_REG8(0x307d), 0xfb },
        { CCI_REG8(0x307e), 0x04 },
        { CCI_REG8(0x307f), 0x02 },
        { CCI_REG8(0x3080), 0xfc },
        { CCI_REG8(0x3081), 0x05 },
        { CCI_REG8(0x3082), 0xfc },
        { CCI_REG8(0x3083), 0x02 },
        { CCI_REG8(0x3084), 0xfc },
        { CCI_REG8(0x3085), 0x03 },
        { CCI_REG8(0x3086), 0xfc },
        { CCI_REG8(0x3087), 0xfe },
        { CCI_REG8(0x30a4), 0x77 },
        { CCI_REG8(0x30a8), 0x20 },
        { CCI_REG8(0x30a9), 0x00 },
        { CCI_REG8(0x30ac), 0x08 },
        { CCI_REG8(0x30ad), 0x78 },
        { CCI_REG8(0x30b0), 0x20 },
        { CCI_REG8(0x30b1), 0x00 },
        { CCI_REG8(0x30b4), 0x10 },
        { CCI_REG8(0x30b5), 0x70 },
        { CCI_REG16_LE(0x30b6), 0x01f2 },
        { CCI_REG16_LE(0x3112), 0x10 },
        { CCI_REG16_LE(0x3116), 0x02 },
};

static const struct cci_reg_sequence mipi_data_rate_1188Mbps[] = {
        { IMX335_REG_BCWAIT_TIME, 0x3b },
        { IMX335_REG_CPWAIT_TIME, 0x2a },
        { IMX335_REG_INCLKSEL1, 0x00c6 },
        { IMX335_REG_INCLKSEL2, 0x02 },
        { IMX335_REG_INCLKSEL3, 0xa0 },
        { IMX335_REG_INCLKSEL4, 0x7e },
        { IMX335_REG_SYSMODE, 0x01 },
        { IMX335_REG_TCLKPOST, 0x8f },
        { IMX335_REG_TCLKPREPARE, 0x4f },
        { IMX335_REG_TCLK_TRAIL, 0x47 },
        { IMX335_REG_TCLK_ZERO, 0x0137 },
        { IMX335_REG_THS_PREPARE, 0x4f },
        { IMX335_REG_THS_ZERO,  0x87 },
        { IMX335_REG_THS_TRAIL, 0x4f },
        { IMX335_REG_THS_EXIT, 0x7f },
        { IMX335_REG_TPLX, 0x3f },
};

static const struct cci_reg_sequence mipi_data_rate_891Mbps[] = {
        { IMX335_REG_BCWAIT_TIME, 0x3b },
        { IMX335_REG_CPWAIT_TIME, 0x2a },
        { IMX335_REG_INCLKSEL1, 0x0129 },
        { IMX335_REG_INCLKSEL2, 0x06 },
        { IMX335_REG_INCLKSEL3, 0xa0 },
        { IMX335_REG_INCLKSEL4, 0x7e },
        { IMX335_REG_SYSMODE, 0x02 },
        { IMX335_REG_TCLKPOST, 0x7f },
        { IMX335_REG_TCLKPREPARE, 0x37 },
        { IMX335_REG_TCLK_TRAIL, 0x37 },
        { IMX335_REG_TCLK_ZERO, 0xf7 },
        { IMX335_REG_THS_PREPARE, 0x3f },
        { IMX335_REG_THS_ZERO, 0x6f },
        { IMX335_REG_THS_TRAIL, 0x3f },
        { IMX335_REG_THS_EXIT, 0x5f },
        { IMX335_REG_TPLX, 0x2f },
};

static const s64 link_freq[] = {
        /* Corresponds to 1188Mbps data lane rate */
        IMX335_LINK_FREQ_594MHz,
        /* Corresponds to 891Mbps data lane rate */
        IMX335_LINK_FREQ_445MHz,
};

static const struct imx335_reg_list link_freq_reglist[] = {
        {
                .num_of_regs = ARRAY_SIZE(mipi_data_rate_1188Mbps),
                .regs = mipi_data_rate_1188Mbps,
        },
        {
                .num_of_regs = ARRAY_SIZE(mipi_data_rate_891Mbps),
                .regs = mipi_data_rate_891Mbps,
        },
};

static const u32 imx335_mbus_codes[] = {
        MEDIA_BUS_FMT_SRGGB12_1X12,
        MEDIA_BUS_FMT_SRGGB10_1X10,
};

/* Supported sensor mode configurations */
static const struct imx335_mode supported_modes[] = {
        {
                .scan_mode = IMX335_ALL_PIXEL,
                .width = 2592,
                .height = 1944,
                .hblank = 342,
                .vblank = 2556,
                .vblank_min = 2556,
                .vblank_max = 133060,
                .pclk = 396000000,
                .reg_list = {
                        .num_of_regs = ARRAY_SIZE(mode_2592x1944_regs),
                        .regs = mode_2592x1944_regs,
                },
                .vflip_normal = {
                        .num_of_regs = ARRAY_SIZE(mode_2592x1944_vflip_normal),
                        .regs = mode_2592x1944_vflip_normal,
                },
                .vflip_inverted = {
                        .num_of_regs = ARRAY_SIZE(mode_2592x1944_vflip_inverted),
                        .regs = mode_2592x1944_vflip_inverted,
                }
        }, {
                .scan_mode = IMX335_2_2_BINNING,
                .width = 1312,
                .height = 972,
                .hblank = 155,
                .vblank = 3528,
                .vblank_min = 3528,
                .vblank_max = 133060,
                .pclk = 396000000,
                .reg_list = {
                        .num_of_regs = ARRAY_SIZE(mode_1312x972_regs),
                        .regs = mode_1312x972_regs,
                },
                .vflip_normal = {
                        .num_of_regs = ARRAY_SIZE(mode_1312x972_vflip_normal),
                        .regs = mode_1312x972_vflip_normal,
                },
                .vflip_inverted = {
                        .num_of_regs = ARRAY_SIZE(mode_1312x972_vflip_inverted),
                        .regs = mode_1312x972_vflip_inverted,
                },
        },
};

/**
 * to_imx335() - imx335 V4L2 sub-device to imx335 device.
 * @subdev: pointer to imx335 V4L2 sub-device
 *
 * Return: pointer to imx335 device
 */
static inline struct imx335 *to_imx335(struct v4l2_subdev *subdev)
{
        return container_of(subdev, struct imx335, sd);
}

/**
 * imx335_update_controls() - Update control ranges based on streaming mode
 * @imx335: pointer to imx335 device
 * @mode: pointer to imx335_mode sensor mode
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_update_controls(struct imx335 *imx335,
                                  const struct imx335_mode *mode)
{
        int ret;

        ret = __v4l2_ctrl_s_ctrl(imx335->link_freq_ctrl,
                                 __ffs(imx335->link_freq_bitmap));
        if (ret)
                return ret;

        ret = __v4l2_ctrl_modify_range(imx335->hblank_ctrl, mode->hblank,
                                       mode->hblank, 1, mode->hblank);
        if (ret)
                return ret;

        return __v4l2_ctrl_modify_range(imx335->vblank_ctrl, mode->vblank_min,
                                        mode->vblank_max, 1, mode->vblank);
}

/**
 * imx335_update_exp_gain() - Set updated exposure and gain
 * @imx335: pointer to imx335 device
 * @exposure: updated exposure value
 * @gain: updated analog gain value
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_update_exp_gain(struct imx335 *imx335, u32 exposure, u32 gain)
{
        u32 lpfr, shutter;
        int ret_hold;
        int ret = 0;

        lpfr = imx335->vblank + imx335->cur_mode->height;
        shutter = lpfr - exposure;

        dev_dbg(imx335->dev, "Set exp %u, analog gain %u, shutter %u, lpfr %u\n",
                exposure, gain, shutter, lpfr);

        cci_write(imx335->cci, IMX335_REG_HOLD, 1, &ret);
        cci_write(imx335->cci, IMX335_REG_VMAX, lpfr, &ret);
        cci_write(imx335->cci, IMX335_REG_SHUTTER, shutter, &ret);
        cci_write(imx335->cci, IMX335_REG_GAIN, gain, &ret);
        /*
         * Unconditionally attempt to release the hold, but track the
         * error if the unhold itself fails.
         */
        ret_hold = cci_write(imx335->cci, IMX335_REG_HOLD, 0, NULL);
        if (ret_hold)
                ret = ret_hold;

        return ret;
}

static int imx335_update_vertical_flip(struct imx335 *imx335, u32 vflip)
{
        const struct imx335_reg_list * const vflip_regs =
                vflip ? &imx335->cur_mode->vflip_inverted :
                        &imx335->cur_mode->vflip_normal;
        int ret = 0;

        cci_multi_reg_write(imx335->cci, vflip_regs->regs,
                            vflip_regs->num_of_regs, &ret);

        return cci_write(imx335->cci, IMX335_REG_VREVERSE, vflip, &ret);
}

static int imx335_update_test_pattern(struct imx335 *imx335, u32 pattern_index)
{
        int ret = 0;

        if (pattern_index >= ARRAY_SIZE(imx335_tpg_val))
                return -EINVAL;

        if (pattern_index) {
                const struct cci_reg_sequence tpg_enable_regs[] = {
                        { IMX335_REG_TPG_TESTCLKEN, 0x10 },
                        { IMX335_REG_TPG_DIG_CLP_MODE, 0x00 },
                        { IMX335_REG_TPG_EN_DUOUT, 0x01 },
                        { IMX335_REG_TPG_COLORWIDTH, 0x11 },
                        { IMX335_REG_BLKLEVEL, 0x00 },
                        { IMX335_REG_WRJ_OPEN, 0x00 },
                };

                cci_write(imx335->cci, IMX335_REG_TPG,
                          imx335_tpg_val[pattern_index], &ret);

                cci_multi_reg_write(imx335->cci, tpg_enable_regs,
                                    ARRAY_SIZE(tpg_enable_regs), &ret);
        } else {
                const struct cci_reg_sequence tpg_disable_regs[] = {
                        { IMX335_REG_TPG_TESTCLKEN, 0x00 },
                        { IMX335_REG_TPG_DIG_CLP_MODE, 0x01 },
                        { IMX335_REG_TPG_EN_DUOUT, 0x00 },
                        { IMX335_REG_TPG_COLORWIDTH, 0x10 },
                        { IMX335_REG_BLKLEVEL, 0x32 },
                        { IMX335_REG_WRJ_OPEN, 0x01 },
                };

                cci_multi_reg_write(imx335->cci, tpg_disable_regs,
                                    ARRAY_SIZE(tpg_disable_regs), &ret);
        }

        return ret;
}

/**
 * imx335_set_ctrl() - Set subdevice control
 * @ctrl: pointer to v4l2_ctrl structure
 *
 * Supported controls:
 * - V4L2_CID_VBLANK
 * - cluster controls:
 *   - V4L2_CID_ANALOGUE_GAIN
 *   - V4L2_CID_EXPOSURE
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_set_ctrl(struct v4l2_ctrl *ctrl)
{
        struct imx335 *imx335 =
                container_of(ctrl->handler, struct imx335, ctrl_handler);
        u32 analog_gain;
        u32 exposure;
        int ret;

        /* Propagate change of current control to all related controls */
        if (ctrl->id == V4L2_CID_VBLANK) {
                u32 shutter_min = IMX335_SHUTTER_MIN;
                u32 lpfr;

                imx335->vblank = imx335->vblank_ctrl->val;
                lpfr = imx335->vblank + imx335->cur_mode->height;

                dev_dbg(imx335->dev, "Received vblank %u, new lpfr %u\n",
                        imx335->vblank, lpfr);

                if (imx335->cur_mode->scan_mode == IMX335_2_2_BINNING)
                        shutter_min = IMX335_SHUTTER_MIN_BINNED;

                ret = __v4l2_ctrl_modify_range(imx335->exp_ctrl,
                                               IMX335_EXPOSURE_MIN,
                                               lpfr - shutter_min, 1,
                                               IMX335_EXPOSURE_DEFAULT);
                if (ret)
                        return ret;
        }

        /*
         * Applying V4L2 control value only happens
         * when power is up for streaming.
         */
        if (pm_runtime_get_if_in_use(imx335->dev) == 0)
                return 0;

        switch (ctrl->id) {
        case V4L2_CID_VBLANK:
                exposure = imx335->exp_ctrl->val;
                analog_gain = imx335->again_ctrl->val;

                ret = imx335_update_exp_gain(imx335, exposure, analog_gain);

                break;
        case V4L2_CID_EXPOSURE:
                exposure = ctrl->val;
                analog_gain = imx335->again_ctrl->val;

                dev_dbg(imx335->dev, "Received exp %u, analog gain %u\n",
                        exposure, analog_gain);

                ret = imx335_update_exp_gain(imx335, exposure, analog_gain);

                break;
        case V4L2_CID_VFLIP:
                ret = imx335_update_vertical_flip(imx335, ctrl->val);

                break;
        case V4L2_CID_TEST_PATTERN:
                ret = imx335_update_test_pattern(imx335, ctrl->val);

                break;
        default:
                dev_err(imx335->dev, "Invalid control %d\n", ctrl->id);
                ret = -EINVAL;
        }

        pm_runtime_put(imx335->dev);

        return ret;
}

/* V4l2 subdevice control ops*/
static const struct v4l2_ctrl_ops imx335_ctrl_ops = {
        .s_ctrl = imx335_set_ctrl,
};

static int imx335_get_format_code(struct imx335 *imx335, u32 code)
{
        unsigned int i;

        for (i = 0; i < ARRAY_SIZE(imx335_mbus_codes); i++) {
                if (imx335_mbus_codes[i] == code)
                        return imx335_mbus_codes[i];
        }

        return imx335_mbus_codes[0];
}

/**
 * imx335_enum_mbus_code() - Enumerate V4L2 sub-device mbus codes
 * @sd: pointer to imx335 V4L2 sub-device structure
 * @sd_state: V4L2 sub-device configuration
 * @code: V4L2 sub-device code enumeration need to be filled
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_enum_mbus_code(struct v4l2_subdev *sd,
                                 struct v4l2_subdev_state *sd_state,
                                 struct v4l2_subdev_mbus_code_enum *code)
{
        if (code->index >= ARRAY_SIZE(imx335_mbus_codes))
                return -EINVAL;

        code->code = imx335_mbus_codes[code->index];

        return 0;
}

/**
 * imx335_enum_frame_size() - Enumerate V4L2 sub-device frame sizes
 * @sd: pointer to imx335 V4L2 sub-device structure
 * @sd_state: V4L2 sub-device configuration
 * @fsize: V4L2 sub-device size enumeration need to be filled
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_enum_frame_size(struct v4l2_subdev *sd,
                                  struct v4l2_subdev_state *sd_state,
                                  struct v4l2_subdev_frame_size_enum *fsize)
{
        struct imx335 *imx335 = to_imx335(sd);
        u32 code;

        if (fsize->index >= ARRAY_SIZE(supported_modes))
                return -EINVAL;

        code = imx335_get_format_code(imx335, fsize->code);
        if (fsize->code != code)
                return -EINVAL;

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

        return 0;
}

/**
 * imx335_fill_pad_format() - Fill subdevice pad format
 *                            from selected sensor mode
 * @imx335: pointer to imx335 device
 * @mode: pointer to imx335_mode sensor mode
 * @fmt: V4L2 sub-device format need to be filled
 */
static void imx335_fill_pad_format(struct imx335 *imx335,
                                   const struct imx335_mode *mode,
                                   struct v4l2_subdev_format *fmt)
{
        fmt->format.width = mode->width;
        fmt->format.height = mode->height;
        fmt->format.code = imx335->cur_mbus_code;
        fmt->format.field = V4L2_FIELD_NONE;
        fmt->format.colorspace = V4L2_COLORSPACE_RAW;
        fmt->format.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
        fmt->format.quantization = V4L2_QUANTIZATION_DEFAULT;
        fmt->format.xfer_func = V4L2_XFER_FUNC_NONE;
}

/**
 * imx335_set_pad_format() - Set subdevice pad format
 * @sd: pointer to imx335 V4L2 sub-device structure
 * @sd_state: V4L2 sub-device configuration
 * @fmt: V4L2 sub-device format need to be set
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_set_pad_format(struct v4l2_subdev *sd,
                                 struct v4l2_subdev_state *sd_state,
                                 struct v4l2_subdev_format *fmt)
{
        struct imx335 *imx335 = to_imx335(sd);
        struct v4l2_mbus_framefmt *format;
        const struct imx335_mode *mode;
        struct v4l2_rect *crop;
        int i, ret = 0;

        mode = v4l2_find_nearest_size(supported_modes,
                                      ARRAY_SIZE(supported_modes),
                                      width, height,
                                      fmt->format.width, fmt->format.height);

        for (i = 0; i < ARRAY_SIZE(imx335_mbus_codes); i++) {
                if (imx335_mbus_codes[i] == fmt->format.code)
                        imx335->cur_mbus_code = imx335_mbus_codes[i];
        }

        imx335_fill_pad_format(imx335, mode, fmt);

        format = v4l2_subdev_state_get_format(sd_state, fmt->pad);
        *format = fmt->format;

        crop = v4l2_subdev_state_get_crop(sd_state, fmt->pad);
        crop->width = fmt->format.width;
        crop->height = fmt->format.height;
        if (mode->scan_mode == IMX335_2_2_BINNING) {
                crop->width *= 2;
                crop->height *= 2;
        }
        crop->left = (imx335_native_area.width - crop->width) / 2;
        crop->top = (imx335_native_area.height - crop->height) / 2;

        if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
                ret = imx335_update_controls(imx335, mode);
                if (!ret)
                        imx335->cur_mode = mode;
        }

        return ret;
}

/**
 * imx335_init_state() - Initialize sub-device state
 * @sd: pointer to imx335 V4L2 sub-device structure
 * @sd_state: V4L2 sub-device configuration
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_init_state(struct v4l2_subdev *sd,
                             struct v4l2_subdev_state *sd_state)
{
        struct imx335 *imx335 = to_imx335(sd);
        struct v4l2_subdev_format fmt = { 0 };

        fmt.which = sd_state ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
        imx335_fill_pad_format(imx335, &supported_modes[0], &fmt);

        __v4l2_ctrl_modify_range(imx335->link_freq_ctrl, 0,
                                 __fls(imx335->link_freq_bitmap),
                                 ~(imx335->link_freq_bitmap),
                                 __ffs(imx335->link_freq_bitmap));

        return imx335_set_pad_format(sd, sd_state, &fmt);
}

/**
 * imx335_get_selection() - Selection API
 * @sd: pointer to imx335 V4L2 sub-device structure
 * @sd_state: V4L2 sub-device configuration
 * @sel: V4L2 selection info
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_get_selection(struct v4l2_subdev *sd,
                                struct v4l2_subdev_state *sd_state,
                                struct v4l2_subdev_selection *sel)
{
        switch (sel->target) {
        case V4L2_SEL_TGT_CROP:
                sel->r = *v4l2_subdev_state_get_crop(sd_state, 0);

                return 0;

        case V4L2_SEL_TGT_NATIVE_SIZE:
                sel->r = imx335_native_area;
                return 0;

        case V4L2_SEL_TGT_CROP_DEFAULT:
        case V4L2_SEL_TGT_CROP_BOUNDS:
                sel->r = imx335_active_area;
                return 0;
        }

        return -EINVAL;
}

static int imx335_set_framefmt(struct imx335 *imx335)
{
        /*
         * In the all-pixel scan mode the AD conversion shall match the output
         * bit width requested.
         *
         * However, when 2/2 binning is enabled, the AD conversion is always
         * 10-bit, so we ensure ADBIT is clear and ADBIT1 is assigned 0x1ff.
         * That's as much as the documentation gives us...
         */
        int ret = 0;
        u8 bpp = imx335->cur_mbus_code == MEDIA_BUS_FMT_SRGGB10_1X10 ? 10 : 12;
        u8 ad_conv = bpp;

        /* Start with the output mode */
        cci_write(imx335->cci, IMX335_REG_MDBIT, bpp == 12, &ret);

        /* Enforce 10 bit AD on binning modes */
        if (imx335->cur_mode->scan_mode == IMX335_2_2_BINNING)
                ad_conv = 10;

        /* AD Conversion configuration */
        if (ad_conv == 10) {
                cci_write(imx335->cci, IMX335_REG_ADBIT, 0x00, &ret);
                cci_write(imx335->cci, IMX335_REG_ADBIT1, 0x1ff, &ret);
        } else { /* 12 bit AD Conversion */
                cci_write(imx335->cci, IMX335_REG_ADBIT, 0x01, &ret);
                cci_write(imx335->cci, IMX335_REG_ADBIT1, 0x47, &ret);
        }

        return ret;
}

/**
 * imx335_enable_streams() - Enable sensor streams
 * @sd: V4L2 subdevice
 * @state: V4L2 subdevice state
 * @pad: The pad to enable
 * @streams_mask: Bitmask of streams to enable
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_enable_streams(struct v4l2_subdev *sd,
                                 struct v4l2_subdev_state *state, u32 pad,
                                 u64 streams_mask)
{
        struct imx335 *imx335 = to_imx335(sd);
        const struct imx335_reg_list *reg_list;
        int ret;

        ret = pm_runtime_resume_and_get(imx335->dev);
        if (ret < 0)
                return ret;

        /* Setup PLL */
        reg_list = &link_freq_reglist[__ffs(imx335->link_freq_bitmap)];
        ret = cci_multi_reg_write(imx335->cci, reg_list->regs,
                                  reg_list->num_of_regs, NULL);
        if (ret) {
                dev_err(imx335->dev, "%s failed to set plls\n", __func__);
                goto err_rpm_put;
        }

        /* Write sensor mode registers */
        reg_list = &imx335->cur_mode->reg_list;
        ret = cci_multi_reg_write(imx335->cci, reg_list->regs,
                                  reg_list->num_of_regs, NULL);
        if (ret) {
                dev_err(imx335->dev, "fail to write initial registers\n");
                goto err_rpm_put;
        }

        /* Write sensor common registers */
        ret = cci_multi_reg_write(imx335->cci, imx335_common_regs,
                                  ARRAY_SIZE(imx335_common_regs), NULL);
        if (ret) {
                dev_err(imx335->dev, "fail to write initial registers\n");
                goto err_rpm_put;
        }

        ret = imx335_set_framefmt(imx335);
        if (ret) {
                dev_err(imx335->dev, "%s failed to set frame format: %d\n",
                        __func__, ret);
                goto err_rpm_put;
        }

        /* Configure lanes */
        ret = cci_write(imx335->cci, IMX335_REG_LANEMODE,
                        imx335->lane_mode, NULL);
        if (ret)
                goto err_rpm_put;

        /* Setup handler will write actual exposure and gain */
        ret =  __v4l2_ctrl_handler_setup(imx335->sd.ctrl_handler);
        if (ret) {
                dev_err(imx335->dev, "fail to setup handler\n");
                goto err_rpm_put;
        }

        /* Start streaming */
        ret = cci_write(imx335->cci, IMX335_REG_MODE_SELECT,
                        IMX335_MODE_STREAMING, NULL);
        if (ret) {
                dev_err(imx335->dev, "fail to start streaming\n");
                goto err_rpm_put;
        }

        /* Initial regulator stabilization period */
        usleep_range(18000, 20000);

        return 0;

err_rpm_put:
        pm_runtime_put(imx335->dev);

        return ret;
}

/**
 * imx335_disable_streams() - Disable sensor streams
 * @sd: V4L2 subdevice
 * @state: V4L2 subdevice state
 * @pad: The pad to disable
 * @streams_mask: Bitmask of streams to disable
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_disable_streams(struct v4l2_subdev *sd,
                                  struct v4l2_subdev_state *state, u32 pad,
                                  u64 streams_mask)
{
        struct imx335 *imx335 = to_imx335(sd);
        int ret;

        ret = cci_write(imx335->cci, IMX335_REG_MODE_SELECT,
                        IMX335_MODE_STANDBY, NULL);
        pm_runtime_put(imx335->dev);

        return ret;
}

/**
 * imx335_detect() - Detect imx335 sensor
 * @imx335: pointer to imx335 device
 *
 * Return: 0 if successful, -EIO if sensor id does not match
 */
static int imx335_detect(struct imx335 *imx335)
{
        int ret;
        u64 val;

        ret = cci_read(imx335->cci, IMX335_REG_ID, &val, NULL);
        if (ret)
                return ret;

        if (val != IMX335_ID) {
                dev_err(imx335->dev, "chip id mismatch: %x!=%llx\n",
                        IMX335_ID, val);
                return -ENXIO;
        }

        return 0;
}

/**
 * imx335_parse_hw_config() - Parse HW configuration and check if supported
 * @imx335: pointer to imx335 device
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_parse_hw_config(struct imx335 *imx335)
{
        struct fwnode_handle *fwnode = dev_fwnode(imx335->dev);
        struct v4l2_fwnode_endpoint bus_cfg = {
                .bus_type = V4L2_MBUS_CSI2_DPHY
        };
        struct fwnode_handle *ep;
        unsigned long rate;
        unsigned int i;
        int ret;

        if (!fwnode)
                return -ENXIO;

        /* Request optional reset pin */
        imx335->reset_gpio = devm_gpiod_get_optional(imx335->dev, "reset",
                                                     GPIOD_OUT_HIGH);
        if (IS_ERR(imx335->reset_gpio)) {
                dev_err(imx335->dev, "failed to get reset gpio %pe\n",
                        imx335->reset_gpio);
                return PTR_ERR(imx335->reset_gpio);
        }

        for (i = 0; i < ARRAY_SIZE(imx335_supply_name); i++)
                imx335->supplies[i].supply = imx335_supply_name[i];

        ret = devm_regulator_bulk_get(imx335->dev,
                                      ARRAY_SIZE(imx335_supply_name),
                                      imx335->supplies);
        if (ret) {
                dev_err(imx335->dev, "Failed to get regulators\n");
                return ret;
        }

        /* Get sensor input clock */
        imx335->inclk = devm_v4l2_sensor_clk_get(imx335->dev, NULL);
        if (IS_ERR(imx335->inclk))
                return dev_err_probe(imx335->dev, PTR_ERR(imx335->inclk),
                                     "could not get inclk\n");

        rate = clk_get_rate(imx335->inclk);
        if (rate != IMX335_INCLK_RATE) {
                dev_err(imx335->dev, "inclk frequency mismatch\n");
                return -EINVAL;
        }

        ep = fwnode_graph_get_next_endpoint(fwnode, NULL);
        if (!ep) {
                dev_err(imx335->dev, "Failed to get next endpoint\n");
                return -ENXIO;
        }

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

        switch (bus_cfg.bus.mipi_csi2.num_data_lanes) {
        case 2:
                imx335->lane_mode = IMX335_2LANE;
                break;
        case 4:
                imx335->lane_mode = IMX335_4LANE;
                break;
        default:
                dev_err(imx335->dev,
                        "number of CSI2 data lanes %d is not supported\n",
                        bus_cfg.bus.mipi_csi2.num_data_lanes);
                ret = -EINVAL;
                goto done_endpoint_free;
        }

        ret = v4l2_link_freq_to_bitmap(imx335->dev, bus_cfg.link_frequencies,
                                       bus_cfg.nr_of_link_frequencies,
                                       link_freq, ARRAY_SIZE(link_freq),
                                       &imx335->link_freq_bitmap);

done_endpoint_free:
        v4l2_fwnode_endpoint_free(&bus_cfg);

        return ret;
}

/* V4l2 subdevice ops */
static const struct v4l2_subdev_video_ops imx335_video_ops = {
        .s_stream = v4l2_subdev_s_stream_helper,
};

static const struct v4l2_subdev_pad_ops imx335_pad_ops = {
        .enum_mbus_code = imx335_enum_mbus_code,
        .enum_frame_size = imx335_enum_frame_size,
        .get_selection = imx335_get_selection,
        .set_selection = imx335_get_selection,
        .get_fmt = v4l2_subdev_get_fmt,
        .set_fmt = imx335_set_pad_format,
        .enable_streams = imx335_enable_streams,
        .disable_streams = imx335_disable_streams,
};

static const struct v4l2_subdev_ops imx335_subdev_ops = {
        .video = &imx335_video_ops,
        .pad = &imx335_pad_ops,
};

static const struct v4l2_subdev_internal_ops imx335_internal_ops = {
        .init_state = imx335_init_state,
};

/**
 * imx335_power_on() - Sensor power on sequence
 * @dev: pointer to i2c device
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_power_on(struct device *dev)
{
        struct v4l2_subdev *sd = dev_get_drvdata(dev);
        struct imx335 *imx335 = to_imx335(sd);
        int ret;

        ret = regulator_bulk_enable(ARRAY_SIZE(imx335_supply_name),
                                    imx335->supplies);
        if (ret) {
                dev_err(dev, "%s: failed to enable regulators\n",
                        __func__);
                return ret;
        }

        usleep_range(500, 550); /* Tlow */

        gpiod_set_value_cansleep(imx335->reset_gpio, 0);

        ret = clk_prepare_enable(imx335->inclk);
        if (ret) {
                dev_err(imx335->dev, "fail to enable inclk\n");
                goto error_reset;
        }

        usleep_range(20, 22); /* T4 */

        return 0;

error_reset:
        gpiod_set_value_cansleep(imx335->reset_gpio, 1);
        regulator_bulk_disable(ARRAY_SIZE(imx335_supply_name), imx335->supplies);

        return ret;
}

/**
 * imx335_power_off() - Sensor power off sequence
 * @dev: pointer to i2c device
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_power_off(struct device *dev)
{
        struct v4l2_subdev *sd = dev_get_drvdata(dev);
        struct imx335 *imx335 = to_imx335(sd);

        gpiod_set_value_cansleep(imx335->reset_gpio, 1);
        clk_disable_unprepare(imx335->inclk);
        regulator_bulk_disable(ARRAY_SIZE(imx335_supply_name), imx335->supplies);

        return 0;
}

/**
 * imx335_init_controls() - Initialize sensor subdevice controls
 * @imx335: pointer to imx335 device
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_init_controls(struct imx335 *imx335)
{
        struct v4l2_ctrl_handler *ctrl_hdlr = &imx335->ctrl_handler;
        const struct imx335_mode *mode = imx335->cur_mode;
        struct v4l2_fwnode_device_properties props;
        u32 lpfr, shutter_min;
        int ret;

        ret = v4l2_fwnode_device_parse(imx335->dev, &props);
        if (ret)
                return ret;

        /* v4l2_fwnode_device_properties can add two more controls */
        ret = v4l2_ctrl_handler_init(ctrl_hdlr, 10);
        if (ret)
                return ret;

        /* Initialize exposure and gain */
        lpfr = mode->vblank + mode->height;
        shutter_min = IMX335_SHUTTER_MIN;
        if (mode->scan_mode == IMX335_2_2_BINNING)
                shutter_min = IMX335_SHUTTER_MIN_BINNED;
        imx335->exp_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
                                             &imx335_ctrl_ops,
                                             V4L2_CID_EXPOSURE,
                                             IMX335_EXPOSURE_MIN,
                                             lpfr - shutter_min,
                                             IMX335_EXPOSURE_STEP,
                                             IMX335_EXPOSURE_DEFAULT);

        /*
         * The sensor has an analog gain and a digital gain, both controlled
         * through a single gain value, expressed in 0.3dB increments. Values
         * from 0.0dB (0) to 30.0dB (100) apply analog gain only, higher values
         * up to 72.0dB (240) add further digital gain. Limit the range to
         * analog gain only, support for digital gain can be added separately
         * if needed.
         */
        imx335->again_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
                                               &imx335_ctrl_ops,
                                               V4L2_CID_ANALOGUE_GAIN,
                                               IMX335_AGAIN_MIN,
                                               IMX335_AGAIN_MAX,
                                               IMX335_AGAIN_STEP,
                                               IMX335_AGAIN_DEFAULT);

        v4l2_ctrl_cluster(2, &imx335->exp_ctrl);

        imx335->vflip = v4l2_ctrl_new_std(ctrl_hdlr,
                                          &imx335_ctrl_ops,
                                          V4L2_CID_VFLIP,
                                          0, 1, 1, 0);
        if (imx335->vflip)
                imx335->vflip->flags |= V4L2_CTRL_FLAG_MODIFY_LAYOUT;

        imx335->vblank_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
                                                &imx335_ctrl_ops,
                                                V4L2_CID_VBLANK,
                                                mode->vblank_min,
                                                mode->vblank_max,
                                                1, mode->vblank);

        v4l2_ctrl_new_std_menu_items(ctrl_hdlr,
                                     &imx335_ctrl_ops,
                                     V4L2_CID_TEST_PATTERN,
                                     ARRAY_SIZE(imx335_tpg_menu) - 1,
                                     0, 0, imx335_tpg_menu);

        /* Read only controls */
        imx335->pclk_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
                                              &imx335_ctrl_ops,
                                              V4L2_CID_PIXEL_RATE,
                                              mode->pclk, mode->pclk,
                                              1, mode->pclk);

        imx335->link_freq_ctrl = v4l2_ctrl_new_int_menu(ctrl_hdlr,
                                                        &imx335_ctrl_ops,
                                                        V4L2_CID_LINK_FREQ,
                                                        __fls(imx335->link_freq_bitmap),
                                                        __ffs(imx335->link_freq_bitmap),
                                                        link_freq);
        if (imx335->link_freq_ctrl)
                imx335->link_freq_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;

        imx335->hblank_ctrl = v4l2_ctrl_new_std(ctrl_hdlr,
                                                &imx335_ctrl_ops,
                                                V4L2_CID_HBLANK,
                                                mode->hblank,
                                                mode->hblank,
                                                1, mode->hblank);
        if (imx335->hblank_ctrl)
                imx335->hblank_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;

        v4l2_ctrl_new_fwnode_properties(ctrl_hdlr, &imx335_ctrl_ops, &props);

        if (ctrl_hdlr->error) {
                dev_err(imx335->dev, "control init failed: %d\n",
                        ctrl_hdlr->error);
                v4l2_ctrl_handler_free(ctrl_hdlr);
                return ctrl_hdlr->error;
        }

        imx335->sd.ctrl_handler = ctrl_hdlr;

        return 0;
}

/**
 * imx335_probe() - I2C client device binding
 * @client: pointer to i2c client device
 *
 * Return: 0 if successful, error code otherwise.
 */
static int imx335_probe(struct i2c_client *client)
{
        struct imx335 *imx335;
        int ret;

        imx335 = devm_kzalloc(&client->dev, sizeof(*imx335), GFP_KERNEL);
        if (!imx335)
                return -ENOMEM;

        imx335->dev = &client->dev;
        imx335->cci = devm_cci_regmap_init_i2c(client, 16);
        if (IS_ERR(imx335->cci)) {
                dev_err(imx335->dev, "Unable to initialize I2C\n");
                return -ENODEV;
        }

        /* Initialize subdev */
        v4l2_i2c_subdev_init(&imx335->sd, client, &imx335_subdev_ops);
        imx335->sd.internal_ops = &imx335_internal_ops;

        ret = imx335_parse_hw_config(imx335);
        if (ret) {
                dev_err(imx335->dev, "HW configuration is not supported\n");
                return ret;
        }

        ret = imx335_power_on(imx335->dev);
        if (ret) {
                dev_err(imx335->dev, "failed to power-on the sensor\n");
                return ret;
        }

        /* Check module identity */
        ret = imx335_detect(imx335);
        if (ret) {
                dev_err(imx335->dev, "failed to find sensor: %d\n", ret);
                goto error_power_off;
        }

        /* Set default mode to max resolution */
        imx335->cur_mode = &supported_modes[0];
        imx335->cur_mbus_code = imx335_mbus_codes[0];
        imx335->vblank = imx335->cur_mode->vblank;

        ret = imx335_init_controls(imx335);
        if (ret) {
                dev_err(imx335->dev, "failed to init controls: %d\n", ret);
                goto error_power_off;
        }

        /* Initialize subdev */
        imx335->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
        imx335->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;

        /* Initialize source pad */
        imx335->pad.flags = MEDIA_PAD_FL_SOURCE;
        ret = media_entity_pads_init(&imx335->sd.entity, 1, &imx335->pad);
        if (ret) {
                dev_err(imx335->dev, "failed to init entity pads: %d\n", ret);
                goto error_handler_free;
        }

        imx335->sd.state_lock = imx335->ctrl_handler.lock;
        ret = v4l2_subdev_init_finalize(&imx335->sd);
        if (ret < 0) {
                dev_err(imx335->dev, "subdev init error\n");
                goto error_media_entity;
        }

        ret = v4l2_async_register_subdev_sensor(&imx335->sd);
        if (ret < 0) {
                dev_err(imx335->dev,
                        "failed to register async subdev: %d\n", ret);
                goto error_subdev_cleanup;
        }

        pm_runtime_set_active(imx335->dev);
        pm_runtime_enable(imx335->dev);
        pm_runtime_idle(imx335->dev);

        return 0;

error_subdev_cleanup:
        v4l2_subdev_cleanup(&imx335->sd);
error_media_entity:
        media_entity_cleanup(&imx335->sd.entity);
error_handler_free:
        v4l2_ctrl_handler_free(imx335->sd.ctrl_handler);
error_power_off:
        imx335_power_off(imx335->dev);

        return ret;
}

/**
 * imx335_remove() - I2C client device unbinding
 * @client: pointer to I2C client device
 *
 * Return: 0 if successful, error code otherwise.
 */
static void imx335_remove(struct i2c_client *client)
{
        struct v4l2_subdev *sd = i2c_get_clientdata(client);

        v4l2_async_unregister_subdev(sd);
        v4l2_subdev_cleanup(sd);
        media_entity_cleanup(&sd->entity);
        v4l2_ctrl_handler_free(sd->ctrl_handler);

        pm_runtime_disable(&client->dev);
        if (!pm_runtime_status_suspended(&client->dev))
                imx335_power_off(&client->dev);
        pm_runtime_set_suspended(&client->dev);
}

static const struct dev_pm_ops imx335_pm_ops = {
        SET_RUNTIME_PM_OPS(imx335_power_off, imx335_power_on, NULL)
};

static const struct of_device_id imx335_of_match[] = {
        { .compatible = "sony,imx335" },
        { }
};

MODULE_DEVICE_TABLE(of, imx335_of_match);

static struct i2c_driver imx335_driver = {
        .probe = imx335_probe,
        .remove = imx335_remove,
        .driver = {
                .name = "imx335",
                .pm = &imx335_pm_ops,
                .of_match_table = imx335_of_match,
        },
};

module_i2c_driver(imx335_driver);

MODULE_DESCRIPTION("Sony imx335 sensor driver");
MODULE_LICENSE("GPL");