// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2011-2013 Freescale Semiconductor, Inc. All Rights Reserved.
 * Copyright (C) 2014-2017 Mentor Graphics Inc.
 */

#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <media/v4l2-async.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-event.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-subdev.h>

/* min/typical/max system clock (xclk) frequencies */
#define OV5640_XCLK_MIN  6000000
#define OV5640_XCLK_MAX 54000000

#define OV5640_DEFAULT_SLAVE_ID 0x3c

#define OV5640_REG_SYS_RESET02          0x3002
#define OV5640_REG_SYS_CLOCK_ENABLE02   0x3006
#define OV5640_REG_SYS_CTRL0            0x3008
#define OV5640_REG_SYS_CTRL0_SW_PWDN    0x42
#define OV5640_REG_SYS_CTRL0_SW_PWUP    0x02
#define OV5640_REG_CHIP_ID              0x300a
#define OV5640_REG_IO_MIPI_CTRL00       0x300e
#define OV5640_REG_PAD_OUTPUT_ENABLE01  0x3017
#define OV5640_REG_PAD_OUTPUT_ENABLE02  0x3018
#define OV5640_REG_PAD_OUTPUT00         0x3019
#define OV5640_REG_SYSTEM_CONTROL1      0x302e
#define OV5640_REG_SC_PLL_CTRL0         0x3034
#define OV5640_REG_SC_PLL_CTRL1         0x3035
#define OV5640_REG_SC_PLL_CTRL2         0x3036
#define OV5640_REG_SC_PLL_CTRL3         0x3037
#define OV5640_REG_SLAVE_ID             0x3100
#define OV5640_REG_SCCB_SYS_CTRL1       0x3103
#define OV5640_REG_SYS_ROOT_DIVIDER     0x3108
#define OV5640_REG_AWB_R_GAIN           0x3400
#define OV5640_REG_AWB_G_GAIN           0x3402
#define OV5640_REG_AWB_B_GAIN           0x3404
#define OV5640_REG_AWB_MANUAL_CTRL      0x3406
#define OV5640_REG_AEC_PK_EXPOSURE_HI   0x3500
#define OV5640_REG_AEC_PK_EXPOSURE_MED  0x3501
#define OV5640_REG_AEC_PK_EXPOSURE_LO   0x3502
#define OV5640_REG_AEC_PK_MANUAL        0x3503
#define OV5640_REG_AEC_PK_REAL_GAIN     0x350a
#define OV5640_REG_AEC_PK_VTS           0x350c
#define OV5640_REG_TIMING_DVPHO         0x3808
#define OV5640_REG_TIMING_DVPVO         0x380a
#define OV5640_REG_TIMING_HTS           0x380c
#define OV5640_REG_TIMING_VTS           0x380e
#define OV5640_REG_TIMING_TC_REG20      0x3820
#define OV5640_REG_TIMING_TC_REG21      0x3821
#define OV5640_REG_AEC_CTRL00           0x3a00
#define OV5640_REG_AEC_B50_STEP         0x3a08
#define OV5640_REG_AEC_B60_STEP         0x3a0a
#define OV5640_REG_AEC_CTRL0D           0x3a0d
#define OV5640_REG_AEC_CTRL0E           0x3a0e
#define OV5640_REG_AEC_CTRL0F           0x3a0f
#define OV5640_REG_AEC_CTRL10           0x3a10
#define OV5640_REG_AEC_CTRL11           0x3a11
#define OV5640_REG_AEC_CTRL1B           0x3a1b
#define OV5640_REG_AEC_CTRL1E           0x3a1e
#define OV5640_REG_AEC_CTRL1F           0x3a1f
#define OV5640_REG_HZ5060_CTRL00        0x3c00
#define OV5640_REG_HZ5060_CTRL01        0x3c01
#define OV5640_REG_SIGMADELTA_CTRL0C    0x3c0c
#define OV5640_REG_FRAME_CTRL01         0x4202
#define OV5640_REG_FORMAT_CONTROL00     0x4300
#define OV5640_REG_VFIFO_HSIZE          0x4602
#define OV5640_REG_VFIFO_VSIZE          0x4604
#define OV5640_REG_JPG_MODE_SELECT      0x4713
#define OV5640_REG_CCIR656_CTRL00       0x4730
#define OV5640_REG_POLARITY_CTRL00      0x4740
#define OV5640_REG_MIPI_CTRL00          0x4800
#define OV5640_REG_DEBUG_MODE           0x4814
#define OV5640_REG_ISP_FORMAT_MUX_CTRL  0x501f
#define OV5640_REG_PRE_ISP_TEST_SET1    0x503d
#define OV5640_REG_SDE_CTRL0            0x5580
#define OV5640_REG_SDE_CTRL1            0x5581
#define OV5640_REG_SDE_CTRL3            0x5583
#define OV5640_REG_SDE_CTRL4            0x5584
#define OV5640_REG_SDE_CTRL5            0x5585
#define OV5640_REG_AVG_READOUT          0x56a1

enum ov5640_mode_id {
        OV5640_MODE_QQVGA_160_120 = 0,
        OV5640_MODE_QCIF_176_144,
        OV5640_MODE_QVGA_320_240,
        OV5640_MODE_VGA_640_480,
        OV5640_MODE_NTSC_720_480,
        OV5640_MODE_PAL_720_576,
        OV5640_MODE_XGA_1024_768,
        OV5640_MODE_720P_1280_720,
        OV5640_MODE_1080P_1920_1080,
        OV5640_MODE_QSXGA_2592_1944,
        OV5640_NUM_MODES,
};

enum ov5640_frame_rate {
        OV5640_15_FPS = 0,
        OV5640_30_FPS,
        OV5640_60_FPS,
        OV5640_NUM_FRAMERATES,
};

enum ov5640_format_mux {
        OV5640_FMT_MUX_YUV422 = 0,
        OV5640_FMT_MUX_RGB,
        OV5640_FMT_MUX_DITHER,
        OV5640_FMT_MUX_RAW_DPC,
        OV5640_FMT_MUX_SNR_RAW,
        OV5640_FMT_MUX_RAW_CIP,
};

struct ov5640_pixfmt {
        u32 code;
        u32 colorspace;
};

static const struct ov5640_pixfmt ov5640_formats[] = {
        { MEDIA_BUS_FMT_JPEG_1X8, V4L2_COLORSPACE_JPEG, },
        { MEDIA_BUS_FMT_UYVY8_2X8, V4L2_COLORSPACE_SRGB, },
        { MEDIA_BUS_FMT_YUYV8_2X8, V4L2_COLORSPACE_SRGB, },
        { MEDIA_BUS_FMT_RGB565_2X8_LE, V4L2_COLORSPACE_SRGB, },
        { MEDIA_BUS_FMT_RGB565_2X8_BE, V4L2_COLORSPACE_SRGB, },
        { MEDIA_BUS_FMT_SBGGR8_1X8, V4L2_COLORSPACE_SRGB, },
        { MEDIA_BUS_FMT_SGBRG8_1X8, V4L2_COLORSPACE_SRGB, },
        { MEDIA_BUS_FMT_SGRBG8_1X8, V4L2_COLORSPACE_SRGB, },
        { MEDIA_BUS_FMT_SRGGB8_1X8, V4L2_COLORSPACE_SRGB, },
};

/*
 * FIXME: remove this when a subdev API becomes available
 * to set the MIPI CSI-2 virtual channel.
 */
static unsigned int virtual_channel;
module_param(virtual_channel, uint, 0444);
MODULE_PARM_DESC(virtual_channel,
                 "MIPI CSI-2 virtual channel (0..3), default 0");

static const int ov5640_framerates[] = {
        [OV5640_15_FPS] = 15,
        [OV5640_30_FPS] = 30,
        [OV5640_60_FPS] = 60,
};

/* regulator supplies */
static const char * const ov5640_supply_name[] = {
        "DOVDD", /* Digital I/O (1.8V) supply */
        "AVDD",  /* Analog (2.8V) supply */
        "DVDD",  /* Digital Core (1.5V) supply */
};

#define OV5640_NUM_SUPPLIES ARRAY_SIZE(ov5640_supply_name)

/*
 * Image size under 1280 * 960 are SUBSAMPLING
 * Image size upper 1280 * 960 are SCALING
 */
enum ov5640_downsize_mode {
        SUBSAMPLING,
        SCALING,
};

struct reg_value {
        u16 reg_addr;
        u8 val;
        u8 mask;
        u32 delay_ms;
};

struct ov5640_mode_info {
        enum ov5640_mode_id id;
        enum ov5640_downsize_mode dn_mode;
        u32 hact;
        u32 htot;
        u32 vact;
        u32 vtot;
        const struct reg_value *reg_data;
        u32 reg_data_size;
        u32 max_fps;
};

struct ov5640_ctrls {
        struct v4l2_ctrl_handler handler;
        struct v4l2_ctrl *pixel_rate;
        struct {
                struct v4l2_ctrl *auto_exp;
                struct v4l2_ctrl *exposure;
        };
        struct {
                struct v4l2_ctrl *auto_wb;
                struct v4l2_ctrl *blue_balance;
                struct v4l2_ctrl *red_balance;
        };
        struct {
                struct v4l2_ctrl *auto_gain;
                struct v4l2_ctrl *gain;
        };
        struct v4l2_ctrl *brightness;
        struct v4l2_ctrl *light_freq;
        struct v4l2_ctrl *saturation;
        struct v4l2_ctrl *contrast;
        struct v4l2_ctrl *hue;
        struct v4l2_ctrl *test_pattern;
        struct v4l2_ctrl *hflip;
        struct v4l2_ctrl *vflip;
};

struct ov5640_dev {
        struct i2c_client *i2c_client;
        struct v4l2_subdev sd;
        struct media_pad pad;
        struct v4l2_fwnode_endpoint ep; /* the parsed DT endpoint info */
        struct clk *xclk; /* system clock to OV5640 */
        u32 xclk_freq;

        struct regulator_bulk_data supplies[OV5640_NUM_SUPPLIES];
        struct gpio_desc *reset_gpio;
        struct gpio_desc *pwdn_gpio;
        bool   upside_down;

        /* lock to protect all members below */
        struct mutex lock;

        int power_count;

        struct v4l2_mbus_framefmt fmt;
        bool pending_fmt_change;

        const struct ov5640_mode_info *current_mode;
        const struct ov5640_mode_info *last_mode;
        enum ov5640_frame_rate current_fr;
        struct v4l2_fract frame_interval;

        struct ov5640_ctrls ctrls;

        u32 prev_sysclk, prev_hts;
        u32 ae_low, ae_high, ae_target;

        bool pending_mode_change;
        bool streaming;
};

static inline struct ov5640_dev *to_ov5640_dev(struct v4l2_subdev *sd)
{
        return container_of(sd, struct ov5640_dev, sd);
}

static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl)
{
        return &container_of(ctrl->handler, struct ov5640_dev,
                             ctrls.handler)->sd;
}

/*
 * FIXME: all of these register tables are likely filled with
 * entries that set the register to their power-on default values,
 * and which are otherwise not touched by this driver. Those entries
 * should be identified and removed to speed register load time
 * over i2c.
 */
/* YUV422 UYVY VGA@30fps */
static const struct reg_value ov5640_init_setting_30fps_VGA[] = {
        {0x3103, 0x11, 0, 0}, {0x3008, 0x82, 0, 5}, {0x3008, 0x42, 0, 0},
        {0x3103, 0x03, 0, 0}, {0x3630, 0x36, 0, 0},
        {0x3631, 0x0e, 0, 0}, {0x3632, 0xe2, 0, 0}, {0x3633, 0x12, 0, 0},
        {0x3621, 0xe0, 0, 0}, {0x3704, 0xa0, 0, 0}, {0x3703, 0x5a, 0, 0},
        {0x3715, 0x78, 0, 0}, {0x3717, 0x01, 0, 0}, {0x370b, 0x60, 0, 0},
        {0x3705, 0x1a, 0, 0}, {0x3905, 0x02, 0, 0}, {0x3906, 0x10, 0, 0},
        {0x3901, 0x0a, 0, 0}, {0x3731, 0x12, 0, 0}, {0x3600, 0x08, 0, 0},
        {0x3601, 0x33, 0, 0}, {0x302d, 0x60, 0, 0}, {0x3620, 0x52, 0, 0},
        {0x371b, 0x20, 0, 0}, {0x471c, 0x50, 0, 0}, {0x3a13, 0x43, 0, 0},
        {0x3a18, 0x00, 0, 0}, {0x3a19, 0xf8, 0, 0}, {0x3635, 0x13, 0, 0},
        {0x3636, 0x03, 0, 0}, {0x3634, 0x40, 0, 0}, {0x3622, 0x01, 0, 0},
        {0x3c01, 0xa4, 0, 0}, {0x3c04, 0x28, 0, 0}, {0x3c05, 0x98, 0, 0},
        {0x3c06, 0x00, 0, 0}, {0x3c07, 0x08, 0, 0}, {0x3c08, 0x00, 0, 0},
        {0x3c09, 0x1c, 0, 0}, {0x3c0a, 0x9c, 0, 0}, {0x3c0b, 0x40, 0, 0},
        {0x3820, 0x41, 0, 0}, {0x3821, 0x07, 0, 0}, {0x3814, 0x31, 0, 0},
        {0x3815, 0x31, 0, 0}, {0x3800, 0x00, 0, 0}, {0x3801, 0x00, 0, 0},
        {0x3802, 0x00, 0, 0}, {0x3803, 0x04, 0, 0}, {0x3804, 0x0a, 0, 0},
        {0x3805, 0x3f, 0, 0}, {0x3806, 0x07, 0, 0}, {0x3807, 0x9b, 0, 0},
        {0x3810, 0x00, 0, 0},
        {0x3811, 0x10, 0, 0}, {0x3812, 0x00, 0, 0}, {0x3813, 0x06, 0, 0},
        {0x3618, 0x00, 0, 0}, {0x3612, 0x29, 0, 0}, {0x3708, 0x64, 0, 0},
        {0x3709, 0x52, 0, 0}, {0x370c, 0x03, 0, 0}, {0x3a02, 0x03, 0, 0},
        {0x3a03, 0xd8, 0, 0}, {0x3a08, 0x01, 0, 0}, {0x3a09, 0x27, 0, 0},
        {0x3a0a, 0x00, 0, 0}, {0x3a0b, 0xf6, 0, 0}, {0x3a0e, 0x03, 0, 0},
        {0x3a0d, 0x04, 0, 0}, {0x3a14, 0x03, 0, 0}, {0x3a15, 0xd8, 0, 0},
        {0x4001, 0x02, 0, 0}, {0x4004, 0x02, 0, 0}, {0x3000, 0x00, 0, 0},
        {0x3002, 0x1c, 0, 0}, {0x3004, 0xff, 0, 0}, {0x3006, 0xc3, 0, 0},
        {0x302e, 0x08, 0, 0}, {0x4300, 0x3f, 0, 0},
        {0x501f, 0x00, 0, 0}, {0x4407, 0x04, 0, 0},
        {0x440e, 0x00, 0, 0}, {0x460b, 0x35, 0, 0}, {0x460c, 0x22, 0, 0},
        {0x4837, 0x0a, 0, 0}, {0x3824, 0x02, 0, 0},
        {0x5000, 0xa7, 0, 0}, {0x5001, 0xa3, 0, 0}, {0x5180, 0xff, 0, 0},
        {0x5181, 0xf2, 0, 0}, {0x5182, 0x00, 0, 0}, {0x5183, 0x14, 0, 0},
        {0x5184, 0x25, 0, 0}, {0x5185, 0x24, 0, 0}, {0x5186, 0x09, 0, 0},
        {0x5187, 0x09, 0, 0}, {0x5188, 0x09, 0, 0}, {0x5189, 0x88, 0, 0},
        {0x518a, 0x54, 0, 0}, {0x518b, 0xee, 0, 0}, {0x518c, 0xb2, 0, 0},
        {0x518d, 0x50, 0, 0}, {0x518e, 0x34, 0, 0}, {0x518f, 0x6b, 0, 0},
        {0x5190, 0x46, 0, 0}, {0x5191, 0xf8, 0, 0}, {0x5192, 0x04, 0, 0},
        {0x5193, 0x70, 0, 0}, {0x5194, 0xf0, 0, 0}, {0x5195, 0xf0, 0, 0},
        {0x5196, 0x03, 0, 0}, {0x5197, 0x01, 0, 0}, {0x5198, 0x04, 0, 0},
        {0x5199, 0x6c, 0, 0}, {0x519a, 0x04, 0, 0}, {0x519b, 0x00, 0, 0},
        {0x519c, 0x09, 0, 0}, {0x519d, 0x2b, 0, 0}, {0x519e, 0x38, 0, 0},
        {0x5381, 0x1e, 0, 0}, {0x5382, 0x5b, 0, 0}, {0x5383, 0x08, 0, 0},
        {0x5384, 0x0a, 0, 0}, {0x5385, 0x7e, 0, 0}, {0x5386, 0x88, 0, 0},
        {0x5387, 0x7c, 0, 0}, {0x5388, 0x6c, 0, 0}, {0x5389, 0x10, 0, 0},
        {0x538a, 0x01, 0, 0}, {0x538b, 0x98, 0, 0}, {0x5300, 0x08, 0, 0},
        {0x5301, 0x30, 0, 0}, {0x5302, 0x10, 0, 0}, {0x5303, 0x00, 0, 0},
        {0x5304, 0x08, 0, 0}, {0x5305, 0x30, 0, 0}, {0x5306, 0x08, 0, 0},
        {0x5307, 0x16, 0, 0}, {0x5309, 0x08, 0, 0}, {0x530a, 0x30, 0, 0},
        {0x530b, 0x04, 0, 0}, {0x530c, 0x06, 0, 0}, {0x5480, 0x01, 0, 0},
        {0x5481, 0x08, 0, 0}, {0x5482, 0x14, 0, 0}, {0x5483, 0x28, 0, 0},
        {0x5484, 0x51, 0, 0}, {0x5485, 0x65, 0, 0}, {0x5486, 0x71, 0, 0},
        {0x5487, 0x7d, 0, 0}, {0x5488, 0x87, 0, 0}, {0x5489, 0x91, 0, 0},
        {0x548a, 0x9a, 0, 0}, {0x548b, 0xaa, 0, 0}, {0x548c, 0xb8, 0, 0},
        {0x548d, 0xcd, 0, 0}, {0x548e, 0xdd, 0, 0}, {0x548f, 0xea, 0, 0},
        {0x5490, 0x1d, 0, 0}, {0x5580, 0x02, 0, 0}, {0x5583, 0x40, 0, 0},
        {0x5584, 0x10, 0, 0}, {0x5589, 0x10, 0, 0}, {0x558a, 0x00, 0, 0},
        {0x558b, 0xf8, 0, 0}, {0x5800, 0x23, 0, 0}, {0x5801, 0x14, 0, 0},
        {0x5802, 0x0f, 0, 0}, {0x5803, 0x0f, 0, 0}, {0x5804, 0x12, 0, 0},
        {0x5805, 0x26, 0, 0}, {0x5806, 0x0c, 0, 0}, {0x5807, 0x08, 0, 0},
        {0x5808, 0x05, 0, 0}, {0x5809, 0x05, 0, 0}, {0x580a, 0x08, 0, 0},
        {0x580b, 0x0d, 0, 0}, {0x580c, 0x08, 0, 0}, {0x580d, 0x03, 0, 0},
        {0x580e, 0x00, 0, 0}, {0x580f, 0x00, 0, 0}, {0x5810, 0x03, 0, 0},
        {0x5811, 0x09, 0, 0}, {0x5812, 0x07, 0, 0}, {0x5813, 0x03, 0, 0},
        {0x5814, 0x00, 0, 0}, {0x5815, 0x01, 0, 0}, {0x5816, 0x03, 0, 0},
        {0x5817, 0x08, 0, 0}, {0x5818, 0x0d, 0, 0}, {0x5819, 0x08, 0, 0},
        {0x581a, 0x05, 0, 0}, {0x581b, 0x06, 0, 0}, {0x581c, 0x08, 0, 0},
        {0x581d, 0x0e, 0, 0}, {0x581e, 0x29, 0, 0}, {0x581f, 0x17, 0, 0},
        {0x5820, 0x11, 0, 0}, {0x5821, 0x11, 0, 0}, {0x5822, 0x15, 0, 0},
        {0x5823, 0x28, 0, 0}, {0x5824, 0x46, 0, 0}, {0x5825, 0x26, 0, 0},
        {0x5826, 0x08, 0, 0}, {0x5827, 0x26, 0, 0}, {0x5828, 0x64, 0, 0},
        {0x5829, 0x26, 0, 0}, {0x582a, 0x24, 0, 0}, {0x582b, 0x22, 0, 0},
        {0x582c, 0x24, 0, 0}, {0x582d, 0x24, 0, 0}, {0x582e, 0x06, 0, 0},
        {0x582f, 0x22, 0, 0}, {0x5830, 0x40, 0, 0}, {0x5831, 0x42, 0, 0},
        {0x5832, 0x24, 0, 0}, {0x5833, 0x26, 0, 0}, {0x5834, 0x24, 0, 0},
        {0x5835, 0x22, 0, 0}, {0x5836, 0x22, 0, 0}, {0x5837, 0x26, 0, 0},
        {0x5838, 0x44, 0, 0}, {0x5839, 0x24, 0, 0}, {0x583a, 0x26, 0, 0},
        {0x583b, 0x28, 0, 0}, {0x583c, 0x42, 0, 0}, {0x583d, 0xce, 0, 0},
        {0x5025, 0x00, 0, 0}, {0x3a0f, 0x30, 0, 0}, {0x3a10, 0x28, 0, 0},
        {0x3a1b, 0x30, 0, 0}, {0x3a1e, 0x26, 0, 0}, {0x3a11, 0x60, 0, 0},
        {0x3a1f, 0x14, 0, 0}, {0x3008, 0x02, 0, 0}, {0x3c00, 0x04, 0, 300},
};

static const struct reg_value ov5640_setting_VGA_640_480[] = {
        {0x3c07, 0x08, 0, 0},
        {0x3c09, 0x1c, 0, 0}, {0x3c0a, 0x9c, 0, 0}, {0x3c0b, 0x40, 0, 0},
        {0x3814, 0x31, 0, 0},
        {0x3815, 0x31, 0, 0}, {0x3800, 0x00, 0, 0}, {0x3801, 0x00, 0, 0},
        {0x3802, 0x00, 0, 0}, {0x3803, 0x04, 0, 0}, {0x3804, 0x0a, 0, 0},
        {0x3805, 0x3f, 0, 0}, {0x3806, 0x07, 0, 0}, {0x3807, 0x9b, 0, 0},
        {0x3810, 0x00, 0, 0},
        {0x3811, 0x10, 0, 0}, {0x3812, 0x00, 0, 0}, {0x3813, 0x06, 0, 0},
        {0x3618, 0x00, 0, 0}, {0x3612, 0x29, 0, 0}, {0x3708, 0x64, 0, 0},
        {0x3709, 0x52, 0, 0}, {0x370c, 0x03, 0, 0}, {0x3a02, 0x03, 0, 0},
        {0x3a03, 0xd8, 0, 0}, {0x3a08, 0x01, 0, 0}, {0x3a09, 0x27, 0, 0},
        {0x3a0a, 0x00, 0, 0}, {0x3a0b, 0xf6, 0, 0}, {0x3a0e, 0x03, 0, 0},
        {0x3a0d, 0x04, 0, 0}, {0x3a14, 0x03, 0, 0}, {0x3a15, 0xd8, 0, 0},
        {0x4001, 0x02, 0, 0}, {0x4004, 0x02, 0, 0},
        {0x4407, 0x04, 0, 0}, {0x460b, 0x35, 0, 0}, {0x460c, 0x22, 0, 0},
        {0x3824, 0x02, 0, 0}, {0x5001, 0xa3, 0, 0},
};

static const struct reg_value ov5640_setting_XGA_1024_768[] = {
        {0x3c07, 0x08, 0, 0},
        {0x3c09, 0x1c, 0, 0}, {0x3c0a, 0x9c, 0, 0}, {0x3c0b, 0x40, 0, 0},
        {0x3814, 0x31, 0, 0},
        {0x3815, 0x31, 0, 0}, {0x3800, 0x00, 0, 0}, {0x3801, 0x00, 0, 0},
        {0x3802, 0x00, 0, 0}, {0x3803, 0x04, 0, 0}, {0x3804, 0x0a, 0, 0},
        {0x3805, 0x3f, 0, 0}, {0x3806, 0x07, 0, 0}, {0x3807, 0x9b, 0, 0},
        {0x3810, 0x00, 0, 0},
        {0x3811, 0x10, 0, 0}, {0x3812, 0x00, 0, 0}, {0x3813, 0x06, 0, 0},
        {0x3618, 0x00, 0, 0}, {0x3612, 0x29, 0, 0}, {0x3708, 0x64, 0, 0},
        {0x3709, 0x52, 0, 0}, {0x370c, 0x03, 0, 0}, {0x3a02, 0x03, 0, 0},
        {0x3a03, 0xd8, 0, 0}, {0x3a08, 0x01, 0, 0}, {0x3a09, 0x27, 0, 0},
        {0x3a0a, 0x00, 0, 0}, {0x3a0b, 0xf6, 0, 0}, {0x3a0e, 0x03, 0, 0},
        {0x3a0d, 0x04, 0, 0}, {0x3a14, 0x03, 0, 0}, {0x3a15, 0xd8, 0, 0},
        {0x4001, 0x02, 0, 0}, {0x4004, 0x02, 0, 0},
        {0x4407, 0x04, 0, 0}, {0x460b, 0x35, 0, 0}, {0x460c, 0x22, 0, 0},
        {0x3824, 0x02, 0, 0}, {0x5001, 0xa3, 0, 0},
};

static const struct reg_value ov5640_setting_QVGA_320_240[] = {
        {0x3c07, 0x08, 0, 0},
        {0x3c09, 0x1c, 0, 0}, {0x3c0a, 0x9c, 0, 0}, {0x3c0b, 0x40, 0, 0},
        {0x3814, 0x31, 0, 0},
        {0x3815, 0x31, 0, 0}, {0x3800, 0x00, 0, 0}, {0x3801, 0x00, 0, 0},
        {0x3802, 0x00, 0, 0}, {0x3803, 0x04, 0, 0}, {0x3804, 0x0a, 0, 0},
        {0x3805, 0x3f, 0, 0}, {0x3806, 0x07, 0, 0}, {0x3807, 0x9b, 0, 0},
        {0x3810, 0x00, 0, 0},
        {0x3811, 0x10, 0, 0}, {0x3812, 0x00, 0, 0}, {0x3813, 0x06, 0, 0},
        {0x3618, 0x00, 0, 0}, {0x3612, 0x29, 0, 0}, {0x3708, 0x64, 0, 0},
        {0x3709, 0x52, 0, 0}, {0x370c, 0x03, 0, 0}, {0x3a02, 0x03, 0, 0},
        {0x3a03, 0xd8, 0, 0}, {0x3a08, 0x01, 0, 0}, {0x3a09, 0x27, 0, 0},
        {0x3a0a, 0x00, 0, 0}, {0x3a0b, 0xf6, 0, 0}, {0x3a0e, 0x03, 0, 0},
        {0x3a0d, 0x04, 0, 0}, {0x3a14, 0x03, 0, 0}, {0x3a15, 0xd8, 0, 0},
        {0x4001, 0x02, 0, 0}, {0x4004, 0x02, 0, 0},
        {0x4407, 0x04, 0, 0}, {0x460b, 0x35, 0, 0}, {0x460c, 0x22, 0, 0},
        {0x3824, 0x02, 0, 0}, {0x5001, 0xa3, 0, 0},
};

static const struct reg_value ov5640_setting_QQVGA_160_120[] = {
        {0x3c07, 0x08, 0, 0},
        {0x3c09, 0x1c, 0, 0}, {0x3c0a, 0x9c, 0, 0}, {0x3c0b, 0x40, 0, 0},
        {0x3814, 0x31, 0, 0},
        {0x3815, 0x31, 0, 0}, {0x3800, 0x00, 0, 0}, {0x3801, 0x00, 0, 0},
        {0x3802, 0x00, 0, 0}, {0x3803, 0x04, 0, 0}, {0x3804, 0x0a, 0, 0},
        {0x3805, 0x3f, 0, 0}, {0x3806, 0x07, 0, 0}, {0x3807, 0x9b, 0, 0},
        {0x3810, 0x00, 0, 0},
        {0x3811, 0x10, 0, 0}, {0x3812, 0x00, 0, 0}, {0x3813, 0x06, 0, 0},
        {0x3618, 0x00, 0, 0}, {0x3612, 0x29, 0, 0}, {0x3708, 0x64, 0, 0},
        {0x3709, 0x52, 0, 0}, {0x370c, 0x03, 0, 0}, {0x3a02, 0x03, 0, 0},
        {0x3a03, 0xd8, 0, 0}, {0x3a08, 0x01, 0, 0}, {0x3a09, 0x27, 0, 0},
        {0x3a0a, 0x00, 0, 0}, {0x3a0b, 0xf6, 0, 0}, {0x3a0e, 0x03, 0, 0},
        {0x3a0d, 0x04, 0, 0}, {0x3a14, 0x03, 0, 0}, {0x3a15, 0xd8, 0, 0},
        {0x4001, 0x02, 0, 0}, {0x4004, 0x02, 0, 0},
        {0x4407, 0x04, 0, 0}, {0x5001, 0xa3, 0, 0},
};

static const struct reg_value ov5640_setting_QCIF_176_144[] = {
        {0x3c07, 0x08, 0, 0},
        {0x3c09, 0x1c, 0, 0}, {0x3c0a, 0x9c, 0, 0}, {0x3c0b, 0x40, 0, 0},
        {0x3814, 0x31, 0, 0},
        {0x3815, 0x31, 0, 0}, {0x3800, 0x00, 0, 0}, {0x3801, 0x00, 0, 0},
        {0x3802, 0x00, 0, 0}, {0x3803, 0x04, 0, 0}, {0x3804, 0x0a, 0, 0},
        {0x3805, 0x3f, 0, 0}, {0x3806, 0x07, 0, 0}, {0x3807, 0x9b, 0, 0},
        {0x3810, 0x00, 0, 0},
        {0x3811, 0x10, 0, 0}, {0x3812, 0x00, 0, 0}, {0x3813, 0x06, 0, 0},
        {0x3618, 0x00, 0, 0}, {0x3612, 0x29, 0, 0}, {0x3708, 0x64, 0, 0},
        {0x3709, 0x52, 0, 0}, {0x370c, 0x03, 0, 0}, {0x3a02, 0x03, 0, 0},
        {0x3a03, 0xd8, 0, 0}, {0x3a08, 0x01, 0, 0}, {0x3a09, 0x27, 0, 0},
        {0x3a0a, 0x00, 0, 0}, {0x3a0b, 0xf6, 0, 0}, {0x3a0e, 0x03, 0, 0},
        {0x3a0d, 0x04, 0, 0}, {0x3a14, 0x03, 0, 0}, {0x3a15, 0xd8, 0, 0},
        {0x4001, 0x02, 0, 0}, {0x4004, 0x02, 0, 0},
        {0x4407, 0x04, 0, 0}, {0x460b, 0x35, 0, 0}, {0x460c, 0x22, 0, 0},
        {0x3824, 0x02, 0, 0}, {0x5001, 0xa3, 0, 0},
};

static const struct reg_value ov5640_setting_NTSC_720_480[] = {
        {0x3c07, 0x08, 0, 0},
        {0x3c09, 0x1c, 0, 0}, {0x3c0a, 0x9c, 0, 0}, {0x3c0b, 0x40, 0, 0},
        {0x3814, 0x31, 0, 0},
        {0x3815, 0x31, 0, 0}, {0x3800, 0x00, 0, 0}, {0x3801, 0x00, 0, 0},
        {0x3802, 0x00, 0, 0}, {0x3803, 0x04, 0, 0}, {0x3804, 0x0a, 0, 0},
        {0x3805, 0x3f, 0, 0}, {0x3806, 0x07, 0, 0}, {0x3807, 0x9b, 0, 0},
        {0x3810, 0x00, 0, 0},
        {0x3811, 0x10, 0, 0}, {0x3812, 0x00, 0, 0}, {0x3813, 0x3c, 0, 0},
        {0x3618, 0x00, 0, 0}, {0x3612, 0x29, 0, 0}, {0x3708, 0x64, 0, 0},
        {0x3709, 0x52, 0, 0}, {0x370c, 0x03, 0, 0}, {0x3a02, 0x03, 0, 0},
        {0x3a03, 0xd8, 0, 0}, {0x3a08, 0x01, 0, 0}, {0x3a09, 0x27, 0, 0},
        {0x3a0a, 0x00, 0, 0}, {0x3a0b, 0xf6, 0, 0}, {0x3a0e, 0x03, 0, 0},
        {0x3a0d, 0x04, 0, 0}, {0x3a14, 0x03, 0, 0}, {0x3a15, 0xd8, 0, 0},
        {0x4001, 0x02, 0, 0}, {0x4004, 0x02, 0, 0},
        {0x4407, 0x04, 0, 0}, {0x460b, 0x35, 0, 0}, {0x460c, 0x22, 0, 0},
        {0x3824, 0x02, 0, 0}, {0x5001, 0xa3, 0, 0},
};

static const struct reg_value ov5640_setting_PAL_720_576[] = {
        {0x3c07, 0x08, 0, 0},
        {0x3c09, 0x1c, 0, 0}, {0x3c0a, 0x9c, 0, 0}, {0x3c0b, 0x40, 0, 0},
        {0x3814, 0x31, 0, 0},
        {0x3815, 0x31, 0, 0}, {0x3800, 0x00, 0, 0}, {0x3801, 0x00, 0, 0},
        {0x3802, 0x00, 0, 0}, {0x3803, 0x04, 0, 0}, {0x3804, 0x0a, 0, 0},
        {0x3805, 0x3f, 0, 0}, {0x3806, 0x07, 0, 0}, {0x3807, 0x9b, 0, 0},
        {0x3810, 0x00, 0, 0},
        {0x3811, 0x38, 0, 0}, {0x3812, 0x00, 0, 0}, {0x3813, 0x06, 0, 0},
        {0x3618, 0x00, 0, 0}, {0x3612, 0x29, 0, 0}, {0x3708, 0x64, 0, 0},
        {0x3709, 0x52, 0, 0}, {0x370c, 0x03, 0, 0}, {0x3a02, 0x03, 0, 0},
        {0x3a03, 0xd8, 0, 0}, {0x3a08, 0x01, 0, 0}, {0x3a09, 0x27, 0, 0},
        {0x3a0a, 0x00, 0, 0}, {0x3a0b, 0xf6, 0, 0}, {0x3a0e, 0x03, 0, 0},
        {0x3a0d, 0x04, 0, 0}, {0x3a14, 0x03, 0, 0}, {0x3a15, 0xd8, 0, 0},
        {0x4001, 0x02, 0, 0}, {0x4004, 0x02, 0, 0},
        {0x4407, 0x04, 0, 0}, {0x460b, 0x35, 0, 0}, {0x460c, 0x22, 0, 0},
        {0x3824, 0x02, 0, 0}, {0x5001, 0xa3, 0, 0},
};

static const struct reg_value ov5640_setting_720P_1280_720[] = {
        {0x3c07, 0x07, 0, 0},
        {0x3c09, 0x1c, 0, 0}, {0x3c0a, 0x9c, 0, 0}, {0x3c0b, 0x40, 0, 0},
        {0x3814, 0x31, 0, 0},
        {0x3815, 0x31, 0, 0}, {0x3800, 0x00, 0, 0}, {0x3801, 0x00, 0, 0},
        {0x3802, 0x00, 0, 0}, {0x3803, 0xfa, 0, 0}, {0x3804, 0x0a, 0, 0},
        {0x3805, 0x3f, 0, 0}, {0x3806, 0x06, 0, 0}, {0x3807, 0xa9, 0, 0},
        {0x3810, 0x00, 0, 0},
        {0x3811, 0x10, 0, 0}, {0x3812, 0x00, 0, 0}, {0x3813, 0x04, 0, 0},
        {0x3618, 0x00, 0, 0}, {0x3612, 0x29, 0, 0}, {0x3708, 0x64, 0, 0},
        {0x3709, 0x52, 0, 0}, {0x370c, 0x03, 0, 0}, {0x3a02, 0x02, 0, 0},
        {0x3a03, 0xe4, 0, 0}, {0x3a08, 0x01, 0, 0}, {0x3a09, 0xbc, 0, 0},
        {0x3a0a, 0x01, 0, 0}, {0x3a0b, 0x72, 0, 0}, {0x3a0e, 0x01, 0, 0},
        {0x3a0d, 0x02, 0, 0}, {0x3a14, 0x02, 0, 0}, {0x3a15, 0xe4, 0, 0},
        {0x4001, 0x02, 0, 0}, {0x4004, 0x02, 0, 0},
        {0x4407, 0x04, 0, 0}, {0x460b, 0x37, 0, 0}, {0x460c, 0x20, 0, 0},
        {0x3824, 0x04, 0, 0}, {0x5001, 0x83, 0, 0},
};

static const struct reg_value ov5640_setting_1080P_1920_1080[] = {
        {0x3c07, 0x08, 0, 0},
        {0x3c09, 0x1c, 0, 0}, {0x3c0a, 0x9c, 0, 0}, {0x3c0b, 0x40, 0, 0},
        {0x3814, 0x11, 0, 0},
        {0x3815, 0x11, 0, 0}, {0x3800, 0x00, 0, 0}, {0x3801, 0x00, 0, 0},
        {0x3802, 0x00, 0, 0}, {0x3803, 0x00, 0, 0}, {0x3804, 0x0a, 0, 0},
        {0x3805, 0x3f, 0, 0}, {0x3806, 0x07, 0, 0}, {0x3807, 0x9f, 0, 0},
        {0x3810, 0x00, 0, 0},
        {0x3811, 0x10, 0, 0}, {0x3812, 0x00, 0, 0}, {0x3813, 0x04, 0, 0},
        {0x3618, 0x04, 0, 0}, {0x3612, 0x29, 0, 0}, {0x3708, 0x21, 0, 0},
        {0x3709, 0x12, 0, 0}, {0x370c, 0x00, 0, 0}, {0x3a02, 0x03, 0, 0},
        {0x3a03, 0xd8, 0, 0}, {0x3a08, 0x01, 0, 0}, {0x3a09, 0x27, 0, 0},
        {0x3a0a, 0x00, 0, 0}, {0x3a0b, 0xf6, 0, 0}, {0x3a0e, 0x03, 0, 0},
        {0x3a0d, 0x04, 0, 0}, {0x3a14, 0x03, 0, 0}, {0x3a15, 0xd8, 0, 0},
        {0x4001, 0x02, 0, 0}, {0x4004, 0x06, 0, 0},
        {0x4407, 0x04, 0, 0}, {0x460b, 0x35, 0, 0}, {0x460c, 0x22, 0, 0},
        {0x3824, 0x02, 0, 0}, {0x5001, 0x83, 0, 0},
        {0x3c07, 0x07, 0, 0}, {0x3c08, 0x00, 0, 0},
        {0x3c09, 0x1c, 0, 0}, {0x3c0a, 0x9c, 0, 0}, {0x3c0b, 0x40, 0, 0},
        {0x3800, 0x01, 0, 0}, {0x3801, 0x50, 0, 0}, {0x3802, 0x01, 0, 0},
        {0x3803, 0xb2, 0, 0}, {0x3804, 0x08, 0, 0}, {0x3805, 0xef, 0, 0},
        {0x3806, 0x05, 0, 0}, {0x3807, 0xf1, 0, 0},
        {0x3612, 0x2b, 0, 0}, {0x3708, 0x64, 0, 0},
        {0x3a02, 0x04, 0, 0}, {0x3a03, 0x60, 0, 0}, {0x3a08, 0x01, 0, 0},
        {0x3a09, 0x50, 0, 0}, {0x3a0a, 0x01, 0, 0}, {0x3a0b, 0x18, 0, 0},
        {0x3a0e, 0x03, 0, 0}, {0x3a0d, 0x04, 0, 0}, {0x3a14, 0x04, 0, 0},
        {0x3a15, 0x60, 0, 0}, {0x4407, 0x04, 0, 0},
        {0x460b, 0x37, 0, 0}, {0x460c, 0x20, 0, 0}, {0x3824, 0x04, 0, 0},
        {0x4005, 0x1a, 0, 0},
};

static const struct reg_value ov5640_setting_QSXGA_2592_1944[] = {
        {0x3c07, 0x08, 0, 0},
        {0x3c09, 0x1c, 0, 0}, {0x3c0a, 0x9c, 0, 0}, {0x3c0b, 0x40, 0, 0},
        {0x3814, 0x11, 0, 0},
        {0x3815, 0x11, 0, 0}, {0x3800, 0x00, 0, 0}, {0x3801, 0x00, 0, 0},
        {0x3802, 0x00, 0, 0}, {0x3803, 0x00, 0, 0}, {0x3804, 0x0a, 0, 0},
        {0x3805, 0x3f, 0, 0}, {0x3806, 0x07, 0, 0}, {0x3807, 0x9f, 0, 0},
        {0x3810, 0x00, 0, 0},
        {0x3811, 0x10, 0, 0}, {0x3812, 0x00, 0, 0}, {0x3813, 0x04, 0, 0},
        {0x3618, 0x04, 0, 0}, {0x3612, 0x29, 0, 0}, {0x3708, 0x21, 0, 0},
        {0x3709, 0x12, 0, 0}, {0x370c, 0x00, 0, 0}, {0x3a02, 0x03, 0, 0},
        {0x3a03, 0xd8, 0, 0}, {0x3a08, 0x01, 0, 0}, {0x3a09, 0x27, 0, 0},
        {0x3a0a, 0x00, 0, 0}, {0x3a0b, 0xf6, 0, 0}, {0x3a0e, 0x03, 0, 0},
        {0x3a0d, 0x04, 0, 0}, {0x3a14, 0x03, 0, 0}, {0x3a15, 0xd8, 0, 0},
        {0x4001, 0x02, 0, 0}, {0x4004, 0x06, 0, 0},
        {0x4407, 0x04, 0, 0}, {0x460b, 0x35, 0, 0}, {0x460c, 0x22, 0, 0},
        {0x3824, 0x02, 0, 0}, {0x5001, 0x83, 0, 70},
};

/* power-on sensor init reg table */
static const struct ov5640_mode_info ov5640_mode_init_data = {
        0, SUBSAMPLING, 640, 1896, 480, 984,
        ov5640_init_setting_30fps_VGA,
        ARRAY_SIZE(ov5640_init_setting_30fps_VGA),
        OV5640_30_FPS,
};

static const struct ov5640_mode_info
ov5640_mode_data[OV5640_NUM_MODES] = {
        {OV5640_MODE_QQVGA_160_120, SUBSAMPLING,
         160, 1896, 120, 984,
         ov5640_setting_QQVGA_160_120,
         ARRAY_SIZE(ov5640_setting_QQVGA_160_120),
         OV5640_30_FPS},
        {OV5640_MODE_QCIF_176_144, SUBSAMPLING,
         176, 1896, 144, 984,
         ov5640_setting_QCIF_176_144,
         ARRAY_SIZE(ov5640_setting_QCIF_176_144),
         OV5640_30_FPS},
        {OV5640_MODE_QVGA_320_240, SUBSAMPLING,
         320, 1896, 240, 984,
         ov5640_setting_QVGA_320_240,
         ARRAY_SIZE(ov5640_setting_QVGA_320_240),
         OV5640_30_FPS},
        {OV5640_MODE_VGA_640_480, SUBSAMPLING,
         640, 1896, 480, 1080,
         ov5640_setting_VGA_640_480,
         ARRAY_SIZE(ov5640_setting_VGA_640_480),
         OV5640_60_FPS},
        {OV5640_MODE_NTSC_720_480, SUBSAMPLING,
         720, 1896, 480, 984,
         ov5640_setting_NTSC_720_480,
         ARRAY_SIZE(ov5640_setting_NTSC_720_480),
        OV5640_30_FPS},
        {OV5640_MODE_PAL_720_576, SUBSAMPLING,
         720, 1896, 576, 984,
         ov5640_setting_PAL_720_576,
         ARRAY_SIZE(ov5640_setting_PAL_720_576),
         OV5640_30_FPS},
        {OV5640_MODE_XGA_1024_768, SUBSAMPLING,
         1024, 1896, 768, 1080,
         ov5640_setting_XGA_1024_768,
         ARRAY_SIZE(ov5640_setting_XGA_1024_768),
         OV5640_30_FPS},
        {OV5640_MODE_720P_1280_720, SUBSAMPLING,
         1280, 1892, 720, 740,
         ov5640_setting_720P_1280_720,
         ARRAY_SIZE(ov5640_setting_720P_1280_720),
         OV5640_30_FPS},
        {OV5640_MODE_1080P_1920_1080, SCALING,
         1920, 2500, 1080, 1120,
         ov5640_setting_1080P_1920_1080,
         ARRAY_SIZE(ov5640_setting_1080P_1920_1080),
         OV5640_30_FPS},
        {OV5640_MODE_QSXGA_2592_1944, SCALING,
         2592, 2844, 1944, 1968,
         ov5640_setting_QSXGA_2592_1944,
         ARRAY_SIZE(ov5640_setting_QSXGA_2592_1944),
         OV5640_15_FPS},
};

static int ov5640_init_slave_id(struct ov5640_dev *sensor)
{
        struct i2c_client *client = sensor->i2c_client;
        struct i2c_msg msg;
        u8 buf[3];
        int ret;

        if (client->addr == OV5640_DEFAULT_SLAVE_ID)
                return 0;

        buf[0] = OV5640_REG_SLAVE_ID >> 8;
        buf[1] = OV5640_REG_SLAVE_ID & 0xff;
        buf[2] = client->addr << 1;

        msg.addr = OV5640_DEFAULT_SLAVE_ID;
        msg.flags = 0;
        msg.buf = buf;
        msg.len = sizeof(buf);

        ret = i2c_transfer(client->adapter, &msg, 1);
        if (ret < 0) {
                dev_err(&client->dev, "%s: failed with %d\n", __func__, ret);
                return ret;
        }

        return 0;
}

static int ov5640_write_reg(struct ov5640_dev *sensor, u16 reg, u8 val)
{
        struct i2c_client *client = sensor->i2c_client;
        struct i2c_msg msg;
        u8 buf[3];
        int ret;

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

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

        ret = i2c_transfer(client->adapter, &msg, 1);
        if (ret < 0) {
                dev_err(&client->dev, "%s: error: reg=%x, val=%x\n",
                        __func__, reg, val);
                return ret;
        }

        return 0;
}

static int ov5640_read_reg(struct ov5640_dev *sensor, u16 reg, u8 *val)
{
        struct i2c_client *client = sensor->i2c_client;
        struct i2c_msg msg[2];
        u8 buf[2];
        int ret;

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

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

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

        ret = i2c_transfer(client->adapter, msg, 2);
        if (ret < 0) {
                dev_err(&client->dev, "%s: error: reg=%x\n",
                        __func__, reg);
                return ret;
        }

        *val = buf[0];
        return 0;
}

static int ov5640_read_reg16(struct ov5640_dev *sensor, u16 reg, u16 *val)
{
        u8 hi, lo;
        int ret;

        ret = ov5640_read_reg(sensor, reg, &hi);
        if (ret)
                return ret;
        ret = ov5640_read_reg(sensor, reg + 1, &lo);
        if (ret)
                return ret;

        *val = ((u16)hi << 8) | (u16)lo;
        return 0;
}

static int ov5640_write_reg16(struct ov5640_dev *sensor, u16 reg, u16 val)
{
        int ret;

        ret = ov5640_write_reg(sensor, reg, val >> 8);
        if (ret)
                return ret;

        return ov5640_write_reg(sensor, reg + 1, val & 0xff);
}

static int ov5640_mod_reg(struct ov5640_dev *sensor, u16 reg,
                          u8 mask, u8 val)
{
        u8 readval;
        int ret;

        ret = ov5640_read_reg(sensor, reg, &readval);
        if (ret)
                return ret;

        readval &= ~mask;
        val &= mask;
        val |= readval;

        return ov5640_write_reg(sensor, reg, val);
}

/*
 * After trying the various combinations, reading various
 * documentations spread around the net, and from the various
 * feedback, the clock tree is probably as follows:
 *
 *   +--------------+
 *   |  Ext. Clock  |
 *   +-+------------+
 *     |  +----------+
 *     +->|   PLL1   | - reg 0x3036, for the multiplier
 *        +-+--------+ - reg 0x3037, bits 0-3 for the pre-divider
 *          |  +--------------+
 *          +->| System Clock |  - reg 0x3035, bits 4-7
 *             +-+------------+
 *               |  +--------------+
 *               +->| MIPI Divider | - reg 0x3035, bits 0-3
 *               |  +-+------------+
 *               |    +----------------> MIPI SCLK
 *               |    +  +-----+
 *               |    +->| / 2 |-------> MIPI BIT CLK
 *               |       +-----+
 *               |  +--------------+
 *               +->| PLL Root Div | - reg 0x3037, bit 4
 *                  +-+------------+
 *                    |  +---------+
 *                    +->| Bit Div | - reg 0x3034, bits 0-3
 *                       +-+-------+
 *                         |  +-------------+
 *                         +->| SCLK Div    | - reg 0x3108, bits 0-1
 *                         |  +-+-----------+
 *                         |    +---------------> SCLK
 *                         |  +-------------+
 *                         +->| SCLK 2X Div | - reg 0x3108, bits 2-3
 *                         |  +-+-----------+
 *                         |    +---------------> SCLK 2X
 *                         |  +-------------+
 *                         +->| PCLK Div    | - reg 0x3108, bits 4-5
 *                            ++------------+
 *                             +  +-----------+
 *                             +->|   P_DIV   | - reg 0x3035, bits 0-3
 *                                +-----+-----+
 *                                       +------------> PCLK
 *
 * This is deviating from the datasheet at least for the register
 * 0x3108, since it's said here that the PCLK would be clocked from
 * the PLL.
 *
 * There seems to be also (unverified) constraints:
 *  - the PLL pre-divider output rate should be in the 4-27MHz range
 *  - the PLL multiplier output rate should be in the 500-1000MHz range
 *  - PCLK >= SCLK * 2 in YUV, >= SCLK in Raw or JPEG
 *
 * In the two latter cases, these constraints are met since our
 * factors are hardcoded. If we were to change that, we would need to
 * take this into account. The only varying parts are the PLL
 * multiplier and the system clock divider, which are shared between
 * all these clocks so won't cause any issue.
 */

/*
 * This is supposed to be ranging from 1 to 8, but the value is always
 * set to 3 in the vendor kernels.
 */
#define OV5640_PLL_PREDIV       3

#define OV5640_PLL_MULT_MIN     4
#define OV5640_PLL_MULT_MAX     252

/*
 * This is supposed to be ranging from 1 to 16, but the value is
 * always set to either 1 or 2 in the vendor kernels.
 */
#define OV5640_SYSDIV_MIN       1
#define OV5640_SYSDIV_MAX       16

/*
 * Hardcode these values for scaler and non-scaler modes.
 * FIXME: to be re-calcualted for 1 data lanes setups
 */
#define OV5640_MIPI_DIV_PCLK    2
#define OV5640_MIPI_DIV_SCLK    1

/*
 * This is supposed to be ranging from 1 to 2, but the value is always
 * set to 2 in the vendor kernels.
 */
#define OV5640_PLL_ROOT_DIV                     2
#define OV5640_PLL_CTRL3_PLL_ROOT_DIV_2         BIT(4)

/*
 * We only supports 8-bit formats at the moment
 */
#define OV5640_BIT_DIV                          2
#define OV5640_PLL_CTRL0_MIPI_MODE_8BIT         0x08

/*
 * This is supposed to be ranging from 1 to 8, but the value is always
 * set to 2 in the vendor kernels.
 */
#define OV5640_SCLK_ROOT_DIV    2

/*
 * This is hardcoded so that the consistency is maintained between SCLK and
 * SCLK 2x.
 */
#define OV5640_SCLK2X_ROOT_DIV (OV5640_SCLK_ROOT_DIV / 2)

/*
 * This is supposed to be ranging from 1 to 8, but the value is always
 * set to 1 in the vendor kernels.
 */
#define OV5640_PCLK_ROOT_DIV                    1
#define OV5640_PLL_SYS_ROOT_DIVIDER_BYPASS      0x00

static unsigned long ov5640_compute_sys_clk(struct ov5640_dev *sensor,
                                            u8 pll_prediv, u8 pll_mult,
                                            u8 sysdiv)
{
        unsigned long sysclk = sensor->xclk_freq / pll_prediv * pll_mult;

        /* PLL1 output cannot exceed 1GHz. */
        if (sysclk / 1000000 > 1000)
                return 0;

        return sysclk / sysdiv;
}

static unsigned long ov5640_calc_sys_clk(struct ov5640_dev *sensor,
                                         unsigned long rate,
                                         u8 *pll_prediv, u8 *pll_mult,
                                         u8 *sysdiv)
{
        unsigned long best = ~0;
        u8 best_sysdiv = 1, best_mult = 1;
        u8 _sysdiv, _pll_mult;

        for (_sysdiv = OV5640_SYSDIV_MIN;
             _sysdiv <= OV5640_SYSDIV_MAX;
             _sysdiv++) {
                for (_pll_mult = OV5640_PLL_MULT_MIN;
                     _pll_mult <= OV5640_PLL_MULT_MAX;
                     _pll_mult++) {
                        unsigned long _rate;

                        /*
                         * The PLL multiplier cannot be odd if above
                         * 127.
                         */
                        if (_pll_mult > 127 && (_pll_mult % 2))
                                continue;

                        _rate = ov5640_compute_sys_clk(sensor,
                                                       OV5640_PLL_PREDIV,
                                                       _pll_mult, _sysdiv);

                        /*
                         * We have reached the maximum allowed PLL1 output,
                         * increase sysdiv.
                         */
                        if (!_rate)
                                break;

                        /*
                         * Prefer rates above the expected clock rate than
                         * below, even if that means being less precise.
                         */
                        if (_rate < rate)
                                continue;

                        if (abs(rate - _rate) < abs(rate - best)) {
                                best = _rate;
                                best_sysdiv = _sysdiv;
                                best_mult = _pll_mult;
                        }

                        if (_rate == rate)
                                goto out;
                }
        }

out:
        *sysdiv = best_sysdiv;
        *pll_prediv = OV5640_PLL_PREDIV;
        *pll_mult = best_mult;

        return best;
}

/*
 * ov5640_set_mipi_pclk() - Calculate the clock tree configuration values
 *                          for the MIPI CSI-2 output.
 *
 * @rate: The requested bandwidth per lane in bytes per second.
 *        'Bandwidth Per Lane' is calculated as:
 *        bpl = HTOT * VTOT * FPS * bpp / num_lanes;
 *
 * This function use the requested bandwidth to calculate:
 * - sample_rate = bpl / (bpp / num_lanes);
 *               = bpl / (PLL_RDIV * BIT_DIV * PCLK_DIV * MIPI_DIV / num_lanes);
 *
 * - mipi_sclk   = bpl / MIPI_DIV / 2; ( / 2 is for CSI-2 DDR)
 *
 * with these fixed parameters:
 *      PLL_RDIV        = 2;
 *      BIT_DIVIDER     = 2; (MIPI_BIT_MODE == 8 ? 2 : 2,5);
 *      PCLK_DIV        = 1;
 *
 * The MIPI clock generation differs for modes that use the scaler and modes
 * that do not. In case the scaler is in use, the MIPI_SCLK generates the MIPI
 * BIT CLk, and thus:
 *
 * - mipi_sclk = bpl / MIPI_DIV / 2;
 *   MIPI_DIV = 1;
 *
 * For modes that do not go through the scaler, the MIPI BIT CLOCK is generated
 * from the pixel clock, and thus:
 *
 * - sample_rate = bpl / (bpp / num_lanes);
 *               = bpl / (2 * 2 * 1 * MIPI_DIV / num_lanes);
 *               = bpl / (4 * MIPI_DIV / num_lanes);
 * - MIPI_DIV    = bpp / (4 * num_lanes);
 *
 * FIXME: this have been tested with 16bpp and 2 lanes setup only.
 * MIPI_DIV is fixed to value 2, but it -might- be changed according to the
 * above formula for setups with 1 lane or image formats with different bpp.
 *
 * FIXME: this deviates from the sensor manual documentation which is quite
 * thin on the MIPI clock tree generation part.
 */
static int ov5640_set_mipi_pclk(struct ov5640_dev *sensor,
                                unsigned long rate)
{
        const struct ov5640_mode_info *mode = sensor->current_mode;
        u8 prediv, mult, sysdiv;
        u8 mipi_div;
        int ret;

        /*
         * 1280x720 is reported to use 'SUBSAMPLING' only,
         * but according to the sensor manual it goes through the
         * scaler before subsampling.
         */
        if (mode->dn_mode == SCALING ||
           (mode->id == OV5640_MODE_720P_1280_720))
                mipi_div = OV5640_MIPI_DIV_SCLK;
        else

                mipi_div = OV5640_MIPI_DIV_PCLK;

        ov5640_calc_sys_clk(sensor, rate, &prediv, &mult, &sysdiv);

        ret = ov5640_mod_reg(sensor, OV5640_REG_SC_PLL_CTRL0,
                             0x0f, OV5640_PLL_CTRL0_MIPI_MODE_8BIT);

        ret = ov5640_mod_reg(sensor, OV5640_REG_SC_PLL_CTRL1,
                             0xff, sysdiv << 4 | mipi_div);
        if (ret)
                return ret;

        ret = ov5640_mod_reg(sensor, OV5640_REG_SC_PLL_CTRL2, 0xff, mult);
        if (ret)
                return ret;

        ret = ov5640_mod_reg(sensor, OV5640_REG_SC_PLL_CTRL3,
                             0x1f, OV5640_PLL_CTRL3_PLL_ROOT_DIV_2 | prediv);
        if (ret)
                return ret;

        return ov5640_mod_reg(sensor, OV5640_REG_SYS_ROOT_DIVIDER,
                              0x30, OV5640_PLL_SYS_ROOT_DIVIDER_BYPASS);
}

static unsigned long ov5640_calc_pclk(struct ov5640_dev *sensor,
                                      unsigned long rate,
                                      u8 *pll_prediv, u8 *pll_mult, u8 *sysdiv,
                                      u8 *pll_rdiv, u8 *bit_div, u8 *pclk_div)
{
        unsigned long _rate = rate * OV5640_PLL_ROOT_DIV * OV5640_BIT_DIV *
                                OV5640_PCLK_ROOT_DIV;

        _rate = ov5640_calc_sys_clk(sensor, _rate, pll_prediv, pll_mult,
                                    sysdiv);
        *pll_rdiv = OV5640_PLL_ROOT_DIV;
        *bit_div = OV5640_BIT_DIV;
        *pclk_div = OV5640_PCLK_ROOT_DIV;

        return _rate / *pll_rdiv / *bit_div / *pclk_div;
}

static int ov5640_set_dvp_pclk(struct ov5640_dev *sensor, unsigned long rate)
{
        u8 prediv, mult, sysdiv, pll_rdiv, bit_div, pclk_div;
        int ret;

        ov5640_calc_pclk(sensor, rate, &prediv, &mult, &sysdiv, &pll_rdiv,
                         &bit_div, &pclk_div);

        if (bit_div == 2)
                bit_div = 8;

        ret = ov5640_mod_reg(sensor, OV5640_REG_SC_PLL_CTRL0,
                             0x0f, bit_div);
        if (ret)
                return ret;

        /*
         * We need to set sysdiv according to the clock, and to clear
         * the MIPI divider.
         */
        ret = ov5640_mod_reg(sensor, OV5640_REG_SC_PLL_CTRL1,
                             0xff, sysdiv << 4);
        if (ret)
                return ret;

        ret = ov5640_mod_reg(sensor, OV5640_REG_SC_PLL_CTRL2,
                             0xff, mult);
        if (ret)
                return ret;

        ret = ov5640_mod_reg(sensor, OV5640_REG_SC_PLL_CTRL3,
                             0x1f, prediv | ((pll_rdiv - 1) << 4));
        if (ret)
                return ret;

        return ov5640_mod_reg(sensor, OV5640_REG_SYS_ROOT_DIVIDER, 0x30,
                              (ilog2(pclk_div) << 4));
}

/* set JPEG framing sizes */
static int ov5640_set_jpeg_timings(struct ov5640_dev *sensor,
                                   const struct ov5640_mode_info *mode)
{
        int ret;

        /*
         * compression mode 3 timing
         *
         * Data is transmitted with programmable width (VFIFO_HSIZE).
         * No padding done. Last line may have less data. Varying
         * number of lines per frame, depending on amount of data.
         */
        ret = ov5640_mod_reg(sensor, OV5640_REG_JPG_MODE_SELECT, 0x7, 0x3);
        if (ret < 0)
                return ret;

        ret = ov5640_write_reg16(sensor, OV5640_REG_VFIFO_HSIZE, mode->hact);
        if (ret < 0)
                return ret;

        return ov5640_write_reg16(sensor, OV5640_REG_VFIFO_VSIZE, mode->vact);
}

/* download ov5640 settings to sensor through i2c */
static int ov5640_set_timings(struct ov5640_dev *sensor,
                              const struct ov5640_mode_info *mode)
{
        int ret;

        if (sensor->fmt.code == MEDIA_BUS_FMT_JPEG_1X8) {
                ret = ov5640_set_jpeg_timings(sensor, mode);
                if (ret < 0)
                        return ret;
        }

        ret = ov5640_write_reg16(sensor, OV5640_REG_TIMING_DVPHO, mode->hact);
        if (ret < 0)
                return ret;

        ret = ov5640_write_reg16(sensor, OV5640_REG_TIMING_DVPVO, mode->vact);
        if (ret < 0)
                return ret;

        ret = ov5640_write_reg16(sensor, OV5640_REG_TIMING_HTS, mode->htot);
        if (ret < 0)
                return ret;

        return ov5640_write_reg16(sensor, OV5640_REG_TIMING_VTS, mode->vtot);
}

static int ov5640_load_regs(struct ov5640_dev *sensor,
                            const struct ov5640_mode_info *mode)
{
        const struct reg_value *regs = mode->reg_data;
        unsigned int i;
        u32 delay_ms;
        u16 reg_addr;
        u8 mask, val;
        int ret = 0;

        for (i = 0; i < mode->reg_data_size; ++i, ++regs) {
                delay_ms = regs->delay_ms;
                reg_addr = regs->reg_addr;
                val = regs->val;
                mask = regs->mask;

                /* remain in power down mode for DVP */
                if (regs->reg_addr == OV5640_REG_SYS_CTRL0 &&
                    val == OV5640_REG_SYS_CTRL0_SW_PWUP &&
                    sensor->ep.bus_type != V4L2_MBUS_CSI2_DPHY)
                        continue;

                if (mask)
                        ret = ov5640_mod_reg(sensor, reg_addr, mask, val);
                else
                        ret = ov5640_write_reg(sensor, reg_addr, val);
                if (ret)
                        break;

                if (delay_ms)
                        usleep_range(1000 * delay_ms, 1000 * delay_ms + 100);
        }

        return ov5640_set_timings(sensor, mode);
}

static int ov5640_set_autoexposure(struct ov5640_dev *sensor, bool on)
{
        return ov5640_mod_reg(sensor, OV5640_REG_AEC_PK_MANUAL,
                              BIT(0), on ? 0 : BIT(0));
}

/* read exposure, in number of line periods */
static int ov5640_get_exposure(struct ov5640_dev *sensor)
{
        int exp, ret;
        u8 temp;

        ret = ov5640_read_reg(sensor, OV5640_REG_AEC_PK_EXPOSURE_HI, &temp);
        if (ret)
                return ret;
        exp = ((int)temp & 0x0f) << 16;
        ret = ov5640_read_reg(sensor, OV5640_REG_AEC_PK_EXPOSURE_MED, &temp);
        if (ret)
                return ret;
        exp |= ((int)temp << 8);
        ret = ov5640_read_reg(sensor, OV5640_REG_AEC_PK_EXPOSURE_LO, &temp);
        if (ret)
                return ret;
        exp |= (int)temp;

        return exp >> 4;
}

/* write exposure, given number of line periods */
static int ov5640_set_exposure(struct ov5640_dev *sensor, u32 exposure)
{
        int ret;

        exposure <<= 4;

        ret = ov5640_write_reg(sensor,
                               OV5640_REG_AEC_PK_EXPOSURE_LO,
                               exposure & 0xff);
        if (ret)
                return ret;
        ret = ov5640_write_reg(sensor,
                               OV5640_REG_AEC_PK_EXPOSURE_MED,
                               (exposure >> 8) & 0xff);
        if (ret)
                return ret;
        return ov5640_write_reg(sensor,
                                OV5640_REG_AEC_PK_EXPOSURE_HI,
                                (exposure >> 16) & 0x0f);
}

static int ov5640_get_gain(struct ov5640_dev *sensor)
{
        u16 gain;
        int ret;

        ret = ov5640_read_reg16(sensor, OV5640_REG_AEC_PK_REAL_GAIN, &gain);
        if (ret)
                return ret;

        return gain & 0x3ff;
}

static int ov5640_set_gain(struct ov5640_dev *sensor, int gain)
{
        return ov5640_write_reg16(sensor, OV5640_REG_AEC_PK_REAL_GAIN,
                                  (u16)gain & 0x3ff);
}

static int ov5640_set_autogain(struct ov5640_dev *sensor, bool on)
{
        return ov5640_mod_reg(sensor, OV5640_REG_AEC_PK_MANUAL,
                              BIT(1), on ? 0 : BIT(1));
}

static int ov5640_set_stream_dvp(struct ov5640_dev *sensor, bool on)
{
        return ov5640_write_reg(sensor, OV5640_REG_SYS_CTRL0, on ?
                                OV5640_REG_SYS_CTRL0_SW_PWUP :
                                OV5640_REG_SYS_CTRL0_SW_PWDN);
}

static int ov5640_set_stream_mipi(struct ov5640_dev *sensor, bool on)
{
        int ret;

        /*
         * Enable/disable the MIPI interface
         *
         * 0x300e = on ? 0x45 : 0x40
         *
         * FIXME: the sensor manual (version 2.03) reports
         * [7:5] = 000  : 1 data lane mode
         * [7:5] = 001  : 2 data lanes mode
         * But this settings do not work, while the following ones
         * have been validated for 2 data lanes mode.
         *
         * [7:5] = 010  : 2 data lanes mode
         * [4] = 0      : Power up MIPI HS Tx
         * [3] = 0      : Power up MIPI LS Rx
         * [2] = 1/0    : MIPI interface enable/disable
         * [1:0] = 01/00: FIXME: 'debug'
         */
        ret = ov5640_write_reg(sensor, OV5640_REG_IO_MIPI_CTRL00,
                               on ? 0x45 : 0x40);
        if (ret)
                return ret;

        return ov5640_write_reg(sensor, OV5640_REG_FRAME_CTRL01,
                                on ? 0x00 : 0x0f);
}

static int ov5640_get_sysclk(struct ov5640_dev *sensor)
{
         /* calculate sysclk */
        u32 xvclk = sensor->xclk_freq / 10000;
        u32 multiplier, prediv, VCO, sysdiv, pll_rdiv;
        u32 sclk_rdiv_map[] = {1, 2, 4, 8};
        u32 bit_div2x = 1, sclk_rdiv, sysclk;
        u8 temp1, temp2;
        int ret;

        ret = ov5640_read_reg(sensor, OV5640_REG_SC_PLL_CTRL0, &temp1);
        if (ret)
                return ret;
        temp2 = temp1 & 0x0f;
        if (temp2 == 8 || temp2 == 10)
                bit_div2x = temp2 / 2;

        ret = ov5640_read_reg(sensor, OV5640_REG_SC_PLL_CTRL1, &temp1);
        if (ret)
                return ret;
        sysdiv = temp1 >> 4;
        if (sysdiv == 0)
                sysdiv = 16;

        ret = ov5640_read_reg(sensor, OV5640_REG_SC_PLL_CTRL2, &temp1);
        if (ret)
                return ret;
        multiplier = temp1;

        ret = ov5640_read_reg(sensor, OV5640_REG_SC_PLL_CTRL3, &temp1);
        if (ret)
                return ret;
        prediv = temp1 & 0x0f;
        pll_rdiv = ((temp1 >> 4) & 0x01) + 1;

        ret = ov5640_read_reg(sensor, OV5640_REG_SYS_ROOT_DIVIDER, &temp1);
        if (ret)
                return ret;
        temp2 = temp1 & 0x03;
        sclk_rdiv = sclk_rdiv_map[temp2];

        if (!prediv || !sysdiv || !pll_rdiv || !bit_div2x)
                return -EINVAL;

        VCO = xvclk * multiplier / prediv;

        sysclk = VCO / sysdiv / pll_rdiv * 2 / bit_div2x / sclk_rdiv;

        return sysclk;
}

static int ov5640_set_night_mode(struct ov5640_dev *sensor)
{
         /* read HTS from register settings */
        u8 mode;
        int ret;

        ret = ov5640_read_reg(sensor, OV5640_REG_AEC_CTRL00, &mode);
        if (ret)
                return ret;
        mode &= 0xfb;
        return ov5640_write_reg(sensor, OV5640_REG_AEC_CTRL00, mode);
}

static int ov5640_get_hts(struct ov5640_dev *sensor)
{
        /* read HTS from register settings */
        u16 hts;
        int ret;

        ret = ov5640_read_reg16(sensor, OV5640_REG_TIMING_HTS, &hts);
        if (ret)
                return ret;
        return hts;
}

static int ov5640_get_vts(struct ov5640_dev *sensor)
{
        u16 vts;
        int ret;

        ret = ov5640_read_reg16(sensor, OV5640_REG_TIMING_VTS, &vts);
        if (ret)
                return ret;
        return vts;
}

static int ov5640_set_vts(struct ov5640_dev *sensor, int vts)
{
        return ov5640_write_reg16(sensor, OV5640_REG_TIMING_VTS, vts);
}

static int ov5640_get_light_freq(struct ov5640_dev *sensor)
{
        /* get banding filter value */
        int ret, light_freq = 0;
        u8 temp, temp1;

        ret = ov5640_read_reg(sensor, OV5640_REG_HZ5060_CTRL01, &temp);
        if (ret)
                return ret;

        if (temp & 0x80) {
                /* manual */
                ret = ov5640_read_reg(sensor, OV5640_REG_HZ5060_CTRL00,
                                      &temp1);
                if (ret)
                        return ret;
                if (temp1 & 0x04) {
                        /* 50Hz */
                        light_freq = 50;
                } else {
                        /* 60Hz */
                        light_freq = 60;
                }
        } else {
                /* auto */
                ret = ov5640_read_reg(sensor, OV5640_REG_SIGMADELTA_CTRL0C,
                                      &temp1);
                if (ret)
                        return ret;

                if (temp1 & 0x01) {
                        /* 50Hz */
                        light_freq = 50;
                } else {
                        /* 60Hz */
                }
        }

        return light_freq;
}

static int ov5640_set_bandingfilter(struct ov5640_dev *sensor)
{
        u32 band_step60, max_band60, band_step50, max_band50, prev_vts;
        int ret;

        /* read preview PCLK */
        ret = ov5640_get_sysclk(sensor);
        if (ret < 0)
                return ret;
        if (ret == 0)
                return -EINVAL;
        sensor->prev_sysclk = ret;
        /* read preview HTS */
        ret = ov5640_get_hts(sensor);
        if (ret < 0)
                return ret;
        if (ret == 0)
                return -EINVAL;
        sensor->prev_hts = ret;

        /* read preview VTS */
        ret = ov5640_get_vts(sensor);
        if (ret < 0)
                return ret;
        prev_vts = ret;

        /* calculate banding filter */
        /* 60Hz */
        band_step60 = sensor->prev_sysclk * 100 / sensor->prev_hts * 100 / 120;
        ret = ov5640_write_reg16(sensor, OV5640_REG_AEC_B60_STEP, band_step60);
        if (ret)
                return ret;
        if (!band_step60)
                return -EINVAL;
        max_band60 = (int)((prev_vts - 4) / band_step60);
        ret = ov5640_write_reg(sensor, OV5640_REG_AEC_CTRL0D, max_band60);
        if (ret)
                return ret;

        /* 50Hz */
        band_step50 = sensor->prev_sysclk * 100 / sensor->prev_hts;
        ret = ov5640_write_reg16(sensor, OV5640_REG_AEC_B50_STEP, band_step50);
        if (ret)
                return ret;
        if (!band_step50)
                return -EINVAL;
        max_band50 = (int)((prev_vts - 4) / band_step50);
        return ov5640_write_reg(sensor, OV5640_REG_AEC_CTRL0E, max_band50);
}

static int ov5640_set_ae_target(struct ov5640_dev *sensor, int target)
{
        /* stable in high */
        u32 fast_high, fast_low;
        int ret;

        sensor->ae_low = target * 23 / 25;      /* 0.92 */
        sensor->ae_high = target * 27 / 25;     /* 1.08 */

        fast_high = sensor->ae_high << 1;
        if (fast_high > 255)
                fast_high = 255;

        fast_low = sensor->ae_low >> 1;

        ret = ov5640_write_reg(sensor, OV5640_REG_AEC_CTRL0F, sensor->ae_high);
        if (ret)
                return ret;
        ret = ov5640_write_reg(sensor, OV5640_REG_AEC_CTRL10, sensor->ae_low);
        if (ret)
                return ret;
        ret = ov5640_write_reg(sensor, OV5640_REG_AEC_CTRL1B, sensor->ae_high);
        if (ret)
                return ret;
        ret = ov5640_write_reg(sensor, OV5640_REG_AEC_CTRL1E, sensor->ae_low);
        if (ret)
                return ret;
        ret = ov5640_write_reg(sensor, OV5640_REG_AEC_CTRL11, fast_high);
        if (ret)
                return ret;
        return ov5640_write_reg(sensor, OV5640_REG_AEC_CTRL1F, fast_low);
}

static int ov5640_get_binning(struct ov5640_dev *sensor)
{
        u8 temp;
        int ret;

        ret = ov5640_read_reg(sensor, OV5640_REG_TIMING_TC_REG21, &temp);
        if (ret)
                return ret;

        return temp & BIT(0);
}

static int ov5640_set_binning(struct ov5640_dev *sensor, bool enable)
{
        int ret;

        /*
         * TIMING TC REG21:
         * - [0]:       Horizontal binning enable
         */
        ret = ov5640_mod_reg(sensor, OV5640_REG_TIMING_TC_REG21,
                             BIT(0), enable ? BIT(0) : 0);
        if (ret)
                return ret;
        /*
         * TIMING TC REG20:
         * - [0]:       Undocumented, but hardcoded init sequences
         *              are always setting REG21/REG20 bit 0 to same value...
         */
        return ov5640_mod_reg(sensor, OV5640_REG_TIMING_TC_REG20,
                              BIT(0), enable ? BIT(0) : 0);
}

static int ov5640_set_virtual_channel(struct ov5640_dev *sensor)
{
        struct i2c_client *client = sensor->i2c_client;
        u8 temp, channel = virtual_channel;
        int ret;

        if (channel > 3) {
                dev_err(&client->dev,
                        "%s: wrong virtual_channel parameter, expected (0..3), got %d\n",
                        __func__, channel);
                return -EINVAL;
        }

        ret = ov5640_read_reg(sensor, OV5640_REG_DEBUG_MODE, &temp);
        if (ret)
                return ret;
        temp &= ~(3 << 6);
        temp |= (channel << 6);
        return ov5640_write_reg(sensor, OV5640_REG_DEBUG_MODE, temp);
}

static const struct ov5640_mode_info *
ov5640_find_mode(struct ov5640_dev *sensor, enum ov5640_frame_rate fr,
                 int width, int height, bool nearest)
{
        const struct ov5640_mode_info *mode;

        mode = v4l2_find_nearest_size(ov5640_mode_data,
                                      ARRAY_SIZE(ov5640_mode_data),
                                      hact, vact,
                                      width, height);

        if (!mode ||
            (!nearest && (mode->hact != width || mode->vact != height)))
                return NULL;

        /* Check to see if the current mode exceeds the max frame rate */
        if (ov5640_framerates[fr] > ov5640_framerates[mode->max_fps])
                return NULL;

        return mode;
}

static u64 ov5640_calc_pixel_rate(struct ov5640_dev *sensor)
{
        u64 rate;

        rate = sensor->current_mode->vtot * sensor->current_mode->htot;
        rate *= ov5640_framerates[sensor->current_fr];

        return rate;
}

/*
 * sensor changes between scaling and subsampling, go through
 * exposure calculation
 */
static int ov5640_set_mode_exposure_calc(struct ov5640_dev *sensor,
                                         const struct ov5640_mode_info *mode)
{
        u32 prev_shutter, prev_gain16;
        u32 cap_shutter, cap_gain16;
        u32 cap_sysclk, cap_hts, cap_vts;
        u32 light_freq, cap_bandfilt, cap_maxband;
        u32 cap_gain16_shutter;
        u8 average;
        int ret;

        if (!mode->reg_data)
                return -EINVAL;

        /* read preview shutter */
        ret = ov5640_get_exposure(sensor);
        if (ret < 0)
                return ret;
        prev_shutter = ret;
        ret = ov5640_get_binning(sensor);
        if (ret < 0)
                return ret;
        if (ret && mode->id != OV5640_MODE_720P_1280_720 &&
            mode->id != OV5640_MODE_1080P_1920_1080)
                prev_shutter *= 2;

        /* read preview gain */
        ret = ov5640_get_gain(sensor);
        if (ret < 0)
                return ret;
        prev_gain16 = ret;

        /* get average */
        ret = ov5640_read_reg(sensor, OV5640_REG_AVG_READOUT, &average);
        if (ret)
                return ret;

        /* turn off night mode for capture */
        ret = ov5640_set_night_mode(sensor);
        if (ret < 0)
                return ret;

        /* Write capture setting */
        ret = ov5640_load_regs(sensor, mode);
        if (ret < 0)
                return ret;

        /* read capture VTS */
        ret = ov5640_get_vts(sensor);
        if (ret < 0)
                return ret;
        cap_vts = ret;
        ret = ov5640_get_hts(sensor);
        if (ret < 0)
                return ret;
        if (ret == 0)
                return -EINVAL;
        cap_hts = ret;

        ret = ov5640_get_sysclk(sensor);
        if (ret < 0)
                return ret;
        if (ret == 0)
                return -EINVAL;
        cap_sysclk = ret;

        /* calculate capture banding filter */
        ret = ov5640_get_light_freq(sensor);
        if (ret < 0)
                return ret;
        light_freq = ret;

        if (light_freq == 60) {
                /* 60Hz */
                cap_bandfilt = cap_sysclk * 100 / cap_hts * 100 / 120;
        } else {
                /* 50Hz */
                cap_bandfilt = cap_sysclk * 100 / cap_hts;
        }

        if (!sensor->prev_sysclk) {
                ret = ov5640_get_sysclk(sensor);
                if (ret < 0)
                        return ret;
                if (ret == 0)
                        return -EINVAL;
                sensor->prev_sysclk = ret;
        }

        if (!cap_bandfilt)
                return -EINVAL;

        cap_maxband = (int)((cap_vts - 4) / cap_bandfilt);

        /* calculate capture shutter/gain16 */
        if (average > sensor->ae_low && average < sensor->ae_high) {
                /* in stable range */
                cap_gain16_shutter =
                        prev_gain16 * prev_shutter *
                        cap_sysclk / sensor->prev_sysclk *
                        sensor->prev_hts / cap_hts *
                        sensor->ae_target / average;
        } else {
                cap_gain16_shutter =
                        prev_gain16 * prev_shutter *
                        cap_sysclk / sensor->prev_sysclk *
                        sensor->prev_hts / cap_hts;
        }

        /* gain to shutter */
        if (cap_gain16_shutter < (cap_bandfilt * 16)) {
                /* shutter < 1/100 */
                cap_shutter = cap_gain16_shutter / 16;
                if (cap_shutter < 1)
                        cap_shutter = 1;

                cap_gain16 = cap_gain16_shutter / cap_shutter;
                if (cap_gain16 < 16)
                        cap_gain16 = 16;
        } else {
                if (cap_gain16_shutter > (cap_bandfilt * cap_maxband * 16)) {
                        /* exposure reach max */
                        cap_shutter = cap_bandfilt * cap_maxband;
                        if (!cap_shutter)
                                return -EINVAL;

                        cap_gain16 = cap_gain16_shutter / cap_shutter;
                } else {
                        /* 1/100 < (cap_shutter = n/100) =< max */
                        cap_shutter =
                                ((int)(cap_gain16_shutter / 16 / cap_bandfilt))
                                * cap_bandfilt;
                        if (!cap_shutter)
                                return -EINVAL;

                        cap_gain16 = cap_gain16_shutter / cap_shutter;
                }
        }

        /* set capture gain */
        ret = ov5640_set_gain(sensor, cap_gain16);
        if (ret)
                return ret;

        /* write capture shutter */
        if (cap_shutter > (cap_vts - 4)) {
                cap_vts = cap_shutter + 4;
                ret = ov5640_set_vts(sensor, cap_vts);
                if (ret < 0)
                        return ret;
        }

        /* set exposure */
        return ov5640_set_exposure(sensor, cap_shutter);
}

/*
 * if sensor changes inside scaling or subsampling
 * change mode directly
 */
static int ov5640_set_mode_direct(struct ov5640_dev *sensor,
                                  const struct ov5640_mode_info *mode)
{
        if (!mode->reg_data)
                return -EINVAL;

        /* Write capture setting */
        return ov5640_load_regs(sensor, mode);
}

static int ov5640_set_mode(struct ov5640_dev *sensor)
{
        const struct ov5640_mode_info *mode = sensor->current_mode;
        const struct ov5640_mode_info *orig_mode = sensor->last_mode;
        enum ov5640_downsize_mode dn_mode, orig_dn_mode;
        bool auto_gain = sensor->ctrls.auto_gain->val == 1;
        bool auto_exp =  sensor->ctrls.auto_exp->val == V4L2_EXPOSURE_AUTO;
        unsigned long rate;
        int ret;

        dn_mode = mode->dn_mode;
        orig_dn_mode = orig_mode->dn_mode;

        /* auto gain and exposure must be turned off when changing modes */
        if (auto_gain) {
                ret = ov5640_set_autogain(sensor, false);
                if (ret)
                        return ret;
        }

        if (auto_exp) {
                ret = ov5640_set_autoexposure(sensor, false);
                if (ret)
                        goto restore_auto_gain;
        }

        /*
         * All the formats we support have 16 bits per pixel, seems to require
         * the same rate than YUV, so we can just use 16 bpp all the time.
         */
        rate = ov5640_calc_pixel_rate(sensor) * 16;
        if (sensor->ep.bus_type == V4L2_MBUS_CSI2_DPHY) {
                rate = rate / sensor->ep.bus.mipi_csi2.num_data_lanes;
                ret = ov5640_set_mipi_pclk(sensor, rate);
        } else {
                rate = rate / sensor->ep.bus.parallel.bus_width;
                ret = ov5640_set_dvp_pclk(sensor, rate);
        }

        if (ret < 0)
                return 0;

        if ((dn_mode == SUBSAMPLING && orig_dn_mode == SCALING) ||
            (dn_mode == SCALING && orig_dn_mode == SUBSAMPLING)) {
                /*
                 * change between subsampling and scaling
                 * go through exposure calculation
                 */
                ret = ov5640_set_mode_exposure_calc(sensor, mode);
        } else {
                /*
                 * change inside subsampling or scaling
                 * download firmware directly
                 */
                ret = ov5640_set_mode_direct(sensor, mode);
        }
        if (ret < 0)
                goto restore_auto_exp_gain;

        /* restore auto gain and exposure */
        if (auto_gain)
                ov5640_set_autogain(sensor, true);
        if (auto_exp)
                ov5640_set_autoexposure(sensor, true);

        ret = ov5640_set_binning(sensor, dn_mode != SCALING);
        if (ret < 0)
                return ret;
        ret = ov5640_set_ae_target(sensor, sensor->ae_target);
        if (ret < 0)
                return ret;
        ret = ov5640_get_light_freq(sensor);
        if (ret < 0)
                return ret;
        ret = ov5640_set_bandingfilter(sensor);
        if (ret < 0)
                return ret;
        ret = ov5640_set_virtual_channel(sensor);
        if (ret < 0)
                return ret;

        sensor->pending_mode_change = false;
        sensor->last_mode = mode;

        return 0;

restore_auto_exp_gain:
        if (auto_exp)
                ov5640_set_autoexposure(sensor, true);
restore_auto_gain:
        if (auto_gain)
                ov5640_set_autogain(sensor, true);

        return ret;
}

static int ov5640_set_framefmt(struct ov5640_dev *sensor,
                               struct v4l2_mbus_framefmt *format);

/* restore the last set video mode after chip power-on */
static int ov5640_restore_mode(struct ov5640_dev *sensor)
{
        int ret;

        /* first load the initial register values */
        ret = ov5640_load_regs(sensor, &ov5640_mode_init_data);
        if (ret < 0)
                return ret;
        sensor->last_mode = &ov5640_mode_init_data;

        ret = ov5640_mod_reg(sensor, OV5640_REG_SYS_ROOT_DIVIDER, 0x3f,
                             (ilog2(OV5640_SCLK2X_ROOT_DIV) << 2) |
                             ilog2(OV5640_SCLK_ROOT_DIV));
        if (ret)
                return ret;

        /* now restore the last capture mode */
        ret = ov5640_set_mode(sensor);
        if (ret < 0)
                return ret;

        return ov5640_set_framefmt(sensor, &sensor->fmt);
}

static void ov5640_power(struct ov5640_dev *sensor, bool enable)
{
        gpiod_set_value_cansleep(sensor->pwdn_gpio, enable ? 0 : 1);
}

static void ov5640_reset(struct ov5640_dev *sensor)
{
        if (!sensor->reset_gpio)
                return;

        gpiod_set_value_cansleep(sensor->reset_gpio, 0);

        /* camera power cycle */
        ov5640_power(sensor, false);
        usleep_range(5000, 10000);
        ov5640_power(sensor, true);
        usleep_range(5000, 10000);

        gpiod_set_value_cansleep(sensor->reset_gpio, 1);
        usleep_range(1000, 2000);

        gpiod_set_value_cansleep(sensor->reset_gpio, 0);
        usleep_range(20000, 25000);
}

static int ov5640_set_power_on(struct ov5640_dev *sensor)
{
        struct i2c_client *client = sensor->i2c_client;
        int ret;

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

        ret = regulator_bulk_enable(OV5640_NUM_SUPPLIES,
                                    sensor->supplies);
        if (ret) {
                dev_err(&client->dev, "%s: failed to enable regulators\n",
                        __func__);
                goto xclk_off;
        }

        ov5640_reset(sensor);
        ov5640_power(sensor, true);

        ret = ov5640_init_slave_id(sensor);
        if (ret)
                goto power_off;

        return 0;

power_off:
        ov5640_power(sensor, false);
        regulator_bulk_disable(OV5640_NUM_SUPPLIES, sensor->supplies);
xclk_off:
        clk_disable_unprepare(sensor->xclk);
        return ret;
}

static void ov5640_set_power_off(struct ov5640_dev *sensor)
{
        ov5640_power(sensor, false);
        regulator_bulk_disable(OV5640_NUM_SUPPLIES, sensor->supplies);
        clk_disable_unprepare(sensor->xclk);
}

static int ov5640_set_power_mipi(struct ov5640_dev *sensor, bool on)
{
        int ret;

        if (!on) {
                /* Reset MIPI bus settings to their default values. */
                ov5640_write_reg(sensor, OV5640_REG_IO_MIPI_CTRL00, 0x58);
                ov5640_write_reg(sensor, OV5640_REG_MIPI_CTRL00, 0x04);
                ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT00, 0x00);
                return 0;
        }

        /*
         * Power up MIPI HS Tx and LS Rx; 2 data lanes mode
         *
         * 0x300e = 0x40
         * [7:5] = 010  : 2 data lanes mode (see FIXME note in
         *                "ov5640_set_stream_mipi()")
         * [4] = 0      : Power up MIPI HS Tx
         * [3] = 0      : Power up MIPI LS Rx
         * [2] = 0      : MIPI interface disabled
         */
        ret = ov5640_write_reg(sensor, OV5640_REG_IO_MIPI_CTRL00, 0x40);
        if (ret)
                return ret;

        /*
         * Gate clock and set LP11 in 'no packets mode' (idle)
         *
         * 0x4800 = 0x24
         * [5] = 1      : Gate clock when 'no packets'
         * [2] = 1      : MIPI bus in LP11 when 'no packets'
         */
        ret = ov5640_write_reg(sensor, OV5640_REG_MIPI_CTRL00, 0x24);
        if (ret)
                return ret;

        /*
         * Set data lanes and clock in LP11 when 'sleeping'
         *
         * 0x3019 = 0x70
         * [6] = 1      : MIPI data lane 2 in LP11 when 'sleeping'
         * [5] = 1      : MIPI data lane 1 in LP11 when 'sleeping'
         * [4] = 1      : MIPI clock lane in LP11 when 'sleeping'
         */
        ret = ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT00, 0x70);
        if (ret)
                return ret;

        /* Give lanes some time to coax into LP11 state. */
        usleep_range(500, 1000);

        return 0;
}

static int ov5640_set_power_dvp(struct ov5640_dev *sensor, bool on)
{
        unsigned int flags = sensor->ep.bus.parallel.flags;
        bool bt656 = sensor->ep.bus_type == V4L2_MBUS_BT656;
        u8 polarities = 0;
        int ret;

        if (!on) {
                /* Reset settings to their default values. */
                ov5640_write_reg(sensor, OV5640_REG_CCIR656_CTRL00, 0x00);
                ov5640_write_reg(sensor, OV5640_REG_IO_MIPI_CTRL00, 0x58);
                ov5640_write_reg(sensor, OV5640_REG_POLARITY_CTRL00, 0x20);
                ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT_ENABLE01, 0x00);
                ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT_ENABLE02, 0x00);
                return 0;
        }

        /*
         * Note about parallel port configuration.
         *
         * When configured in parallel mode, the OV5640 will
         * output 10 bits data on DVP data lines [9:0].
         * If only 8 bits data are wanted, the 8 bits data lines
         * of the camera interface must be physically connected
         * on the DVP data lines [9:2].
         *
         * Control lines polarity can be configured through
         * devicetree endpoint control lines properties.
         * If no endpoint control lines properties are set,
         * polarity will be as below:
         * - VSYNC:     active high
         * - HREF:      active low
         * - PCLK:      active low
         *
         * VSYNC & HREF are not configured if BT656 bus mode is selected
         */

        /*
         * BT656 embedded synchronization configuration
         *
         * CCIR656 CTRL00
         * - [7]:       SYNC code selection (0: auto generate sync code,
         *              1: sync code from regs 0x4732-0x4735)
         * - [6]:       f value in CCIR656 SYNC code when fixed f value
         * - [5]:       Fixed f value
         * - [4:3]:     Blank toggle data options (00: data=1'h040/1'h200,
         *              01: data from regs 0x4736-0x4738, 10: always keep 0)
         * - [1]:       Clip data disable
         * - [0]:       CCIR656 mode enable
         *
         * Default CCIR656 SAV/EAV mode with default codes
         * SAV=0xff000080 & EAV=0xff00009d is enabled here with settings:
         * - CCIR656 mode enable
         * - auto generation of sync codes
         * - blank toggle data 1'h040/1'h200
         * - clip reserved data (0x00 & 0xff changed to 0x01 & 0xfe)
         */
        ret = ov5640_write_reg(sensor, OV5640_REG_CCIR656_CTRL00,
                               bt656 ? 0x01 : 0x00);
        if (ret)
                return ret;

        /*
         * configure parallel port control lines polarity
         *
         * POLARITY CTRL0
         * - [5]:       PCLK polarity (0: active low, 1: active high)
         * - [1]:       HREF polarity (0: active low, 1: active high)
         * - [0]:       VSYNC polarity (mismatch here between
         *              datasheet and hardware, 0 is active high
         *              and 1 is active low...)
         */
        if (!bt656) {
                if (flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
                        polarities |= BIT(1);
                if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
                        polarities |= BIT(0);
        }
        if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
                polarities |= BIT(5);

        ret = ov5640_write_reg(sensor, OV5640_REG_POLARITY_CTRL00, polarities);
        if (ret)
                return ret;

        /*
         * powerdown MIPI TX/RX PHY & enable DVP
         *
         * MIPI CONTROL 00
         * [4] = 1      : Power down MIPI HS Tx
         * [3] = 1      : Power down MIPI LS Rx
         * [2] = 0      : DVP enable (MIPI disable)
         */
        ret = ov5640_write_reg(sensor, OV5640_REG_IO_MIPI_CTRL00, 0x18);
        if (ret)
                return ret;

        /*
         * enable VSYNC/HREF/PCLK DVP control lines
         * & D[9:6] DVP data lines
         *
         * PAD OUTPUT ENABLE 01
         * - 6:         VSYNC output enable
         * - 5:         HREF output enable
         * - 4:         PCLK output enable
         * - [3:0]:     D[9:6] output enable
         */
        ret = ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT_ENABLE01,
                               bt656 ? 0x1f : 0x7f);
        if (ret)
                return ret;

        /*
         * enable D[5:0] DVP data lines
         *
         * PAD OUTPUT ENABLE 02
         * - [7:2]:     D[5:0] output enable
         */
        return ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT_ENABLE02, 0xfc);
}

static int ov5640_set_power(struct ov5640_dev *sensor, bool on)
{
        int ret = 0;

        if (on) {
                ret = ov5640_set_power_on(sensor);
                if (ret)
                        return ret;

                ret = ov5640_restore_mode(sensor);
                if (ret)
                        goto power_off;
        }

        if (sensor->ep.bus_type == V4L2_MBUS_CSI2_DPHY)
                ret = ov5640_set_power_mipi(sensor, on);
        else
                ret = ov5640_set_power_dvp(sensor, on);
        if (ret)
                goto power_off;

        if (!on)
                ov5640_set_power_off(sensor);

        return 0;

power_off:
        ov5640_set_power_off(sensor);
        return ret;
}

/* --------------- Subdev Operations --------------- */

static int ov5640_s_power(struct v4l2_subdev *sd, int on)
{
        struct ov5640_dev *sensor = to_ov5640_dev(sd);
        int ret = 0;

        mutex_lock(&sensor->lock);

        /*
         * If the power count is modified from 0 to != 0 or from != 0 to 0,
         * update the power state.
         */
        if (sensor->power_count == !on) {
                ret = ov5640_set_power(sensor, !!on);
                if (ret)
                        goto out;
        }

        /* Update the power count. */
        sensor->power_count += on ? 1 : -1;
        WARN_ON(sensor->power_count < 0);
out:
        mutex_unlock(&sensor->lock);

        if (on && !ret && sensor->power_count == 1) {
                /* restore controls */
                ret = v4l2_ctrl_handler_setup(&sensor->ctrls.handler);
        }

        return ret;
}

static int ov5640_try_frame_interval(struct ov5640_dev *sensor,
                                     struct v4l2_fract *fi,
                                     u32 width, u32 height)
{
        const struct ov5640_mode_info *mode;
        enum ov5640_frame_rate rate = OV5640_15_FPS;
        int minfps, maxfps, best_fps, fps;
        int i;

        minfps = ov5640_framerates[OV5640_15_FPS];
        maxfps = ov5640_framerates[OV5640_60_FPS];

        if (fi->numerator == 0) {
                fi->denominator = maxfps;
                fi->numerator = 1;
                rate = OV5640_60_FPS;
                goto find_mode;
        }

        fps = clamp_val(DIV_ROUND_CLOSEST(fi->denominator, fi->numerator),
                        minfps, maxfps);

        best_fps = minfps;
        for (i = 0; i < ARRAY_SIZE(ov5640_framerates); i++) {
                int curr_fps = ov5640_framerates[i];

                if (abs(curr_fps - fps) < abs(best_fps - fps)) {
                        best_fps = curr_fps;
                        rate = i;
                }
        }

        fi->numerator = 1;
        fi->denominator = best_fps;

find_mode:
        mode = ov5640_find_mode(sensor, rate, width, height, false);
        return mode ? rate : -EINVAL;
}

static int ov5640_get_fmt(struct v4l2_subdev *sd,
                          struct v4l2_subdev_pad_config *cfg,
                          struct v4l2_subdev_format *format)
{
        struct ov5640_dev *sensor = to_ov5640_dev(sd);
        struct v4l2_mbus_framefmt *fmt;

        if (format->pad != 0)
                return -EINVAL;

        mutex_lock(&sensor->lock);

        if (format->which == V4L2_SUBDEV_FORMAT_TRY)
                fmt = v4l2_subdev_get_try_format(&sensor->sd, cfg,
                                                 format->pad);
        else
                fmt = &sensor->fmt;

        format->format = *fmt;

        mutex_unlock(&sensor->lock);

        return 0;
}

static int ov5640_try_fmt_internal(struct v4l2_subdev *sd,
                                   struct v4l2_mbus_framefmt *fmt,
                                   enum ov5640_frame_rate fr,
                                   const struct ov5640_mode_info **new_mode)
{
        struct ov5640_dev *sensor = to_ov5640_dev(sd);
        const struct ov5640_mode_info *mode;
        int i;

        mode = ov5640_find_mode(sensor, fr, fmt->width, fmt->height, true);
        if (!mode)
                return -EINVAL;
        fmt->width = mode->hact;
        fmt->height = mode->vact;

        if (new_mode)
                *new_mode = mode;

        for (i = 0; i < ARRAY_SIZE(ov5640_formats); i++)
                if (ov5640_formats[i].code == fmt->code)
                        break;
        if (i >= ARRAY_SIZE(ov5640_formats))
                i = 0;

        fmt->code = ov5640_formats[i].code;
        fmt->colorspace = ov5640_formats[i].colorspace;
        fmt->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(fmt->colorspace);
        fmt->quantization = V4L2_QUANTIZATION_FULL_RANGE;
        fmt->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(fmt->colorspace);

        return 0;
}

static int ov5640_set_fmt(struct v4l2_subdev *sd,
                          struct v4l2_subdev_pad_config *cfg,
                          struct v4l2_subdev_format *format)
{
        struct ov5640_dev *sensor = to_ov5640_dev(sd);
        const struct ov5640_mode_info *new_mode;
        struct v4l2_mbus_framefmt *mbus_fmt = &format->format;
        struct v4l2_mbus_framefmt *fmt;
        int ret;

        if (format->pad != 0)
                return -EINVAL;

        mutex_lock(&sensor->lock);

        if (sensor->streaming) {
                ret = -EBUSY;
                goto out;
        }

        ret = ov5640_try_fmt_internal(sd, mbus_fmt,
                                      sensor->current_fr, &new_mode);
        if (ret)
                goto out;

        if (format->which == V4L2_SUBDEV_FORMAT_TRY)
                fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
        else
                fmt = &sensor->fmt;

        *fmt = *mbus_fmt;

        if (new_mode != sensor->current_mode) {
                sensor->current_mode = new_mode;
                sensor->pending_mode_change = true;
        }
        if (mbus_fmt->code != sensor->fmt.code)
                sensor->pending_fmt_change = true;

        __v4l2_ctrl_s_ctrl_int64(sensor->ctrls.pixel_rate,
                                 ov5640_calc_pixel_rate(sensor));
out:
        mutex_unlock(&sensor->lock);
        return ret;
}

static int ov5640_set_framefmt(struct ov5640_dev *sensor,
                               struct v4l2_mbus_framefmt *format)
{
        int ret = 0;
        bool is_jpeg = false;
        u8 fmt, mux;

        switch (format->code) {
        case MEDIA_BUS_FMT_UYVY8_2X8:
                /* YUV422, UYVY */
                fmt = 0x3f;
                mux = OV5640_FMT_MUX_YUV422;
                break;
        case MEDIA_BUS_FMT_YUYV8_2X8:
                /* YUV422, YUYV */
                fmt = 0x30;
                mux = OV5640_FMT_MUX_YUV422;
                break;
        case MEDIA_BUS_FMT_RGB565_2X8_LE:
                /* RGB565 {g[2:0],b[4:0]},{r[4:0],g[5:3]} */
                fmt = 0x6F;
                mux = OV5640_FMT_MUX_RGB;
                break;
        case MEDIA_BUS_FMT_RGB565_2X8_BE:
                /* RGB565 {r[4:0],g[5:3]},{g[2:0],b[4:0]} */
                fmt = 0x61;
                mux = OV5640_FMT_MUX_RGB;
                break;
        case MEDIA_BUS_FMT_JPEG_1X8:
                /* YUV422, YUYV */
                fmt = 0x30;
                mux = OV5640_FMT_MUX_YUV422;
                is_jpeg = true;
                break;
        case MEDIA_BUS_FMT_SBGGR8_1X8:
                /* Raw, BGBG... / GRGR... */
                fmt = 0x00;
                mux = OV5640_FMT_MUX_RAW_DPC;
                break;
        case MEDIA_BUS_FMT_SGBRG8_1X8:
                /* Raw bayer, GBGB... / RGRG... */
                fmt = 0x01;
                mux = OV5640_FMT_MUX_RAW_DPC;
                break;
        case MEDIA_BUS_FMT_SGRBG8_1X8:
                /* Raw bayer, GRGR... / BGBG... */
                fmt = 0x02;
                mux = OV5640_FMT_MUX_RAW_DPC;
                break;
        case MEDIA_BUS_FMT_SRGGB8_1X8:
                /* Raw bayer, RGRG... / GBGB... */
                fmt = 0x03;
                mux = OV5640_FMT_MUX_RAW_DPC;
                break;
        default:
                return -EINVAL;
        }

        /* FORMAT CONTROL00: YUV and RGB formatting */
        ret = ov5640_write_reg(sensor, OV5640_REG_FORMAT_CONTROL00, fmt);
        if (ret)
                return ret;

        /* FORMAT MUX CONTROL: ISP YUV or RGB */
        ret = ov5640_write_reg(sensor, OV5640_REG_ISP_FORMAT_MUX_CTRL, mux);
        if (ret)
                return ret;

        /*
         * TIMING TC REG21:
         * - [5]:       JPEG enable
         */
        ret = ov5640_mod_reg(sensor, OV5640_REG_TIMING_TC_REG21,
                             BIT(5), is_jpeg ? BIT(5) : 0);
        if (ret)
                return ret;

        /*
         * SYSTEM RESET02:
         * - [4]:       Reset JFIFO
         * - [3]:       Reset SFIFO
         * - [2]:       Reset JPEG
         */
        ret = ov5640_mod_reg(sensor, OV5640_REG_SYS_RESET02,
                             BIT(4) | BIT(3) | BIT(2),
                             is_jpeg ? 0 : (BIT(4) | BIT(3) | BIT(2)));
        if (ret)
                return ret;

        /*
         * CLOCK ENABLE02:
         * - [5]:       Enable JPEG 2x clock
         * - [3]:       Enable JPEG clock
         */
        return ov5640_mod_reg(sensor, OV5640_REG_SYS_CLOCK_ENABLE02,
                              BIT(5) | BIT(3),
                              is_jpeg ? (BIT(5) | BIT(3)) : 0);
}

/*
 * Sensor Controls.
 */

static int ov5640_set_ctrl_hue(struct ov5640_dev *sensor, int value)
{
        int ret;

        if (value) {
                ret = ov5640_mod_reg(sensor, OV5640_REG_SDE_CTRL0,
                                     BIT(0), BIT(0));
                if (ret)
                        return ret;
                ret = ov5640_write_reg16(sensor, OV5640_REG_SDE_CTRL1, value);
        } else {
                ret = ov5640_mod_reg(sensor, OV5640_REG_SDE_CTRL0, BIT(0), 0);
        }

        return ret;
}

static int ov5640_set_ctrl_contrast(struct ov5640_dev *sensor, int value)
{
        int ret;

        if (value) {
                ret = ov5640_mod_reg(sensor, OV5640_REG_SDE_CTRL0,
                                     BIT(2), BIT(2));
                if (ret)
                        return ret;
                ret = ov5640_write_reg(sensor, OV5640_REG_SDE_CTRL5,
                                       value & 0xff);
        } else {
                ret = ov5640_mod_reg(sensor, OV5640_REG_SDE_CTRL0, BIT(2), 0);
        }

        return ret;
}

static int ov5640_set_ctrl_saturation(struct ov5640_dev *sensor, int value)
{
        int ret;

        if (value) {
                ret = ov5640_mod_reg(sensor, OV5640_REG_SDE_CTRL0,
                                     BIT(1), BIT(1));
                if (ret)
                        return ret;
                ret = ov5640_write_reg(sensor, OV5640_REG_SDE_CTRL3,
                                       value & 0xff);
                if (ret)
                        return ret;
                ret = ov5640_write_reg(sensor, OV5640_REG_SDE_CTRL4,
                                       value & 0xff);
        } else {
                ret = ov5640_mod_reg(sensor, OV5640_REG_SDE_CTRL0, BIT(1), 0);
        }

        return ret;
}

static int ov5640_set_ctrl_white_balance(struct ov5640_dev *sensor, int awb)
{
        int ret;

        ret = ov5640_mod_reg(sensor, OV5640_REG_AWB_MANUAL_CTRL,
                             BIT(0), awb ? 0 : 1);
        if (ret)
                return ret;

        if (!awb) {
                u16 red = (u16)sensor->ctrls.red_balance->val;
                u16 blue = (u16)sensor->ctrls.blue_balance->val;

                ret = ov5640_write_reg16(sensor, OV5640_REG_AWB_R_GAIN, red);
                if (ret)
                        return ret;
                ret = ov5640_write_reg16(sensor, OV5640_REG_AWB_B_GAIN, blue);
        }

        return ret;
}

static int ov5640_set_ctrl_exposure(struct ov5640_dev *sensor,
                                    enum v4l2_exposure_auto_type auto_exposure)
{
        struct ov5640_ctrls *ctrls = &sensor->ctrls;
        bool auto_exp = (auto_exposure == V4L2_EXPOSURE_AUTO);
        int ret = 0;

        if (ctrls->auto_exp->is_new) {
                ret = ov5640_set_autoexposure(sensor, auto_exp);
                if (ret)
                        return ret;
        }

        if (!auto_exp && ctrls->exposure->is_new) {
                u16 max_exp;

                ret = ov5640_read_reg16(sensor, OV5640_REG_AEC_PK_VTS,
                                        &max_exp);
                if (ret)
                        return ret;
                ret = ov5640_get_vts(sensor);
                if (ret < 0)
                        return ret;
                max_exp += ret;
                ret = 0;

                if (ctrls->exposure->val < max_exp)
                        ret = ov5640_set_exposure(sensor, ctrls->exposure->val);
        }

        return ret;
}

static int ov5640_set_ctrl_gain(struct ov5640_dev *sensor, bool auto_gain)
{
        struct ov5640_ctrls *ctrls = &sensor->ctrls;
        int ret = 0;

        if (ctrls->auto_gain->is_new) {
                ret = ov5640_set_autogain(sensor, auto_gain);
                if (ret)
                        return ret;
        }

        if (!auto_gain && ctrls->gain->is_new)
                ret = ov5640_set_gain(sensor, ctrls->gain->val);

        return ret;
}

static const char * const test_pattern_menu[] = {
        "Disabled",
        "Color bars",
        "Color bars w/ rolling bar",
        "Color squares",
        "Color squares w/ rolling bar",
};

#define OV5640_TEST_ENABLE              BIT(7)
#define OV5640_TEST_ROLLING             BIT(6)  /* rolling horizontal bar */
#define OV5640_TEST_TRANSPARENT         BIT(5)
#define OV5640_TEST_SQUARE_BW           BIT(4)  /* black & white squares */
#define OV5640_TEST_BAR_STANDARD        (0 << 2)
#define OV5640_TEST_BAR_VERT_CHANGE_1   (1 << 2)
#define OV5640_TEST_BAR_HOR_CHANGE      (2 << 2)
#define OV5640_TEST_BAR_VERT_CHANGE_2   (3 << 2)
#define OV5640_TEST_BAR                 (0 << 0)
#define OV5640_TEST_RANDOM              (1 << 0)
#define OV5640_TEST_SQUARE              (2 << 0)
#define OV5640_TEST_BLACK               (3 << 0)

static const u8 test_pattern_val[] = {
        0,
        OV5640_TEST_ENABLE | OV5640_TEST_BAR_VERT_CHANGE_1 |
                OV5640_TEST_BAR,
        OV5640_TEST_ENABLE | OV5640_TEST_ROLLING |
                OV5640_TEST_BAR_VERT_CHANGE_1 | OV5640_TEST_BAR,
        OV5640_TEST_ENABLE | OV5640_TEST_SQUARE,
        OV5640_TEST_ENABLE | OV5640_TEST_ROLLING | OV5640_TEST_SQUARE,
};

static int ov5640_set_ctrl_test_pattern(struct ov5640_dev *sensor, int value)
{
        return ov5640_write_reg(sensor, OV5640_REG_PRE_ISP_TEST_SET1,
                                test_pattern_val[value]);
}

static int ov5640_set_ctrl_light_freq(struct ov5640_dev *sensor, int value)
{
        int ret;

        ret = ov5640_mod_reg(sensor, OV5640_REG_HZ5060_CTRL01, BIT(7),
                             (value == V4L2_CID_POWER_LINE_FREQUENCY_AUTO) ?
                             0 : BIT(7));
        if (ret)
                return ret;

        return ov5640_mod_reg(sensor, OV5640_REG_HZ5060_CTRL00, BIT(2),
                              (value == V4L2_CID_POWER_LINE_FREQUENCY_50HZ) ?
                              BIT(2) : 0);
}

static int ov5640_set_ctrl_hflip(struct ov5640_dev *sensor, int value)
{
        /*
         * If sensor is mounted upside down, mirror logic is inversed.
         *
         * Sensor is a BSI (Back Side Illuminated) one,
         * so image captured is physically mirrored.
         * This is why mirror logic is inversed in
         * order to cancel this mirror effect.
         */

        /*
         * TIMING TC REG21:
         * - [2]:       ISP mirror
         * - [1]:       Sensor mirror
         */
        return ov5640_mod_reg(sensor, OV5640_REG_TIMING_TC_REG21,
                              BIT(2) | BIT(1),
                              (!(value ^ sensor->upside_down)) ?
                              (BIT(2) | BIT(1)) : 0);
}

static int ov5640_set_ctrl_vflip(struct ov5640_dev *sensor, int value)
{
        /* If sensor is mounted upside down, flip logic is inversed */

        /*
         * TIMING TC REG20:
         * - [2]:       ISP vflip
         * - [1]:       Sensor vflip
         */
        return ov5640_mod_reg(sensor, OV5640_REG_TIMING_TC_REG20,
                              BIT(2) | BIT(1),
                              (value ^ sensor->upside_down) ?
                              (BIT(2) | BIT(1)) : 0);
}

static int ov5640_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
{
        struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
        struct ov5640_dev *sensor = to_ov5640_dev(sd);
        int val;

        /* v4l2_ctrl_lock() locks our own mutex */

        switch (ctrl->id) {
        case V4L2_CID_AUTOGAIN:
                val = ov5640_get_gain(sensor);
                if (val < 0)
                        return val;
                sensor->ctrls.gain->val = val;
                break;
        case V4L2_CID_EXPOSURE_AUTO:
                val = ov5640_get_exposure(sensor);
                if (val < 0)
                        return val;
                sensor->ctrls.exposure->val = val;
                break;
        }

        return 0;
}

static int ov5640_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct v4l2_subdev *sd = ctrl_to_sd(ctrl);
        struct ov5640_dev *sensor = to_ov5640_dev(sd);
        int ret;

        /* v4l2_ctrl_lock() locks our own mutex */

        /*
         * If the device is not powered up by the host driver do
         * not apply any controls to H/W at this time. Instead
         * the controls will be restored right after power-up.
         */
        if (sensor->power_count == 0)
                return 0;

        switch (ctrl->id) {
        case V4L2_CID_AUTOGAIN:
                ret = ov5640_set_ctrl_gain(sensor, ctrl->val);
                break;
        case V4L2_CID_EXPOSURE_AUTO:
                ret = ov5640_set_ctrl_exposure(sensor, ctrl->val);
                break;
        case V4L2_CID_AUTO_WHITE_BALANCE:
                ret = ov5640_set_ctrl_white_balance(sensor, ctrl->val);
                break;
        case V4L2_CID_HUE:
                ret = ov5640_set_ctrl_hue(sensor, ctrl->val);
                break;
        case V4L2_CID_CONTRAST:
                ret = ov5640_set_ctrl_contrast(sensor, ctrl->val);
                break;
        case V4L2_CID_SATURATION:
                ret = ov5640_set_ctrl_saturation(sensor, ctrl->val);
                break;
        case V4L2_CID_TEST_PATTERN:
                ret = ov5640_set_ctrl_test_pattern(sensor, ctrl->val);
                break;
        case V4L2_CID_POWER_LINE_FREQUENCY:
                ret = ov5640_set_ctrl_light_freq(sensor, ctrl->val);
                break;
        case V4L2_CID_HFLIP:
                ret = ov5640_set_ctrl_hflip(sensor, ctrl->val);
                break;
        case V4L2_CID_VFLIP:
                ret = ov5640_set_ctrl_vflip(sensor, ctrl->val);
                break;
        default:
                ret = -EINVAL;
                break;
        }

        return ret;
}

static const struct v4l2_ctrl_ops ov5640_ctrl_ops = {
        .g_volatile_ctrl = ov5640_g_volatile_ctrl,
        .s_ctrl = ov5640_s_ctrl,
};

static int ov5640_init_controls(struct ov5640_dev *sensor)
{
        const struct v4l2_ctrl_ops *ops = &ov5640_ctrl_ops;
        struct ov5640_ctrls *ctrls = &sensor->ctrls;
        struct v4l2_ctrl_handler *hdl = &ctrls->handler;
        int ret;

        v4l2_ctrl_handler_init(hdl, 32);

        /* we can use our own mutex for the ctrl lock */
        hdl->lock = &sensor->lock;

        /* Clock related controls */
        ctrls->pixel_rate = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_PIXEL_RATE,
                                              0, INT_MAX, 1,
                                              ov5640_calc_pixel_rate(sensor));

        /* Auto/manual white balance */
        ctrls->auto_wb = v4l2_ctrl_new_std(hdl, ops,
                                           V4L2_CID_AUTO_WHITE_BALANCE,
                                           0, 1, 1, 1);
        ctrls->blue_balance = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_BLUE_BALANCE,
                                                0, 4095, 1, 0);
        ctrls->red_balance = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_RED_BALANCE,
                                               0, 4095, 1, 0);
        /* Auto/manual exposure */
        ctrls->auto_exp = v4l2_ctrl_new_std_menu(hdl, ops,
                                                 V4L2_CID_EXPOSURE_AUTO,
                                                 V4L2_EXPOSURE_MANUAL, 0,
                                                 V4L2_EXPOSURE_AUTO);
        ctrls->exposure = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_EXPOSURE,
                                            0, 65535, 1, 0);
        /* Auto/manual gain */
        ctrls->auto_gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_AUTOGAIN,
                                             0, 1, 1, 1);
        ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAIN,
                                        0, 1023, 1, 0);

        ctrls->saturation = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_SATURATION,
                                              0, 255, 1, 64);
        ctrls->hue = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HUE,
                                       0, 359, 1, 0);
        ctrls->contrast = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_CONTRAST,
                                            0, 255, 1, 0);
        ctrls->test_pattern =
                v4l2_ctrl_new_std_menu_items(hdl, ops, V4L2_CID_TEST_PATTERN,
                                             ARRAY_SIZE(test_pattern_menu) - 1,
                                             0, 0, test_pattern_menu);
        ctrls->hflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HFLIP,
                                         0, 1, 1, 0);
        ctrls->vflip = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_VFLIP,
                                         0, 1, 1, 0);

        ctrls->light_freq =
                v4l2_ctrl_new_std_menu(hdl, ops,
                                       V4L2_CID_POWER_LINE_FREQUENCY,
                                       V4L2_CID_POWER_LINE_FREQUENCY_AUTO, 0,
                                       V4L2_CID_POWER_LINE_FREQUENCY_50HZ);

        if (hdl->error) {
                ret = hdl->error;
                goto free_ctrls;
        }

        ctrls->pixel_rate->flags |= V4L2_CTRL_FLAG_READ_ONLY;
        ctrls->gain->flags |= V4L2_CTRL_FLAG_VOLATILE;
        ctrls->exposure->flags |= V4L2_CTRL_FLAG_VOLATILE;

        v4l2_ctrl_auto_cluster(3, &ctrls->auto_wb, 0, false);
        v4l2_ctrl_auto_cluster(2, &ctrls->auto_gain, 0, true);
        v4l2_ctrl_auto_cluster(2, &ctrls->auto_exp, 1, true);

        sensor->sd.ctrl_handler = hdl;
        return 0;

free_ctrls:
        v4l2_ctrl_handler_free(hdl);
        return ret;
}

static int ov5640_enum_frame_size(struct v4l2_subdev *sd,
                                  struct v4l2_subdev_pad_config *cfg,
                                  struct v4l2_subdev_frame_size_enum *fse)
{
        if (fse->pad != 0)
                return -EINVAL;
        if (fse->index >= OV5640_NUM_MODES)
                return -EINVAL;

        fse->min_width =
                ov5640_mode_data[fse->index].hact;
        fse->max_width = fse->min_width;
        fse->min_height =
                ov5640_mode_data[fse->index].vact;
        fse->max_height = fse->min_height;

        return 0;
}

static int ov5640_enum_frame_interval(
        struct v4l2_subdev *sd,
        struct v4l2_subdev_pad_config *cfg,
        struct v4l2_subdev_frame_interval_enum *fie)
{
        struct ov5640_dev *sensor = to_ov5640_dev(sd);
        struct v4l2_fract tpf;
        int ret;

        if (fie->pad != 0)
                return -EINVAL;
        if (fie->index >= OV5640_NUM_FRAMERATES)
                return -EINVAL;

        tpf.numerator = 1;
        tpf.denominator = ov5640_framerates[fie->index];

        ret = ov5640_try_frame_interval(sensor, &tpf,
                                        fie->width, fie->height);
        if (ret < 0)
                return -EINVAL;

        fie->interval = tpf;
        return 0;
}

static int ov5640_g_frame_interval(struct v4l2_subdev *sd,
                                   struct v4l2_subdev_frame_interval *fi)
{
        struct ov5640_dev *sensor = to_ov5640_dev(sd);

        mutex_lock(&sensor->lock);
        fi->interval = sensor->frame_interval;
        mutex_unlock(&sensor->lock);

        return 0;
}

static int ov5640_s_frame_interval(struct v4l2_subdev *sd,
                                   struct v4l2_subdev_frame_interval *fi)
{
        struct ov5640_dev *sensor = to_ov5640_dev(sd);
        const struct ov5640_mode_info *mode;
        int frame_rate, ret = 0;

        if (fi->pad != 0)
                return -EINVAL;

        mutex_lock(&sensor->lock);

        if (sensor->streaming) {
                ret = -EBUSY;
                goto out;
        }

        mode = sensor->current_mode;

        frame_rate = ov5640_try_frame_interval(sensor, &fi->interval,
                                               mode->hact, mode->vact);
        if (frame_rate < 0) {
                /* Always return a valid frame interval value */
                fi->interval = sensor->frame_interval;
                goto out;
        }

        mode = ov5640_find_mode(sensor, frame_rate, mode->hact,
                                mode->vact, true);
        if (!mode) {
                ret = -EINVAL;
                goto out;
        }

        if (mode != sensor->current_mode ||
            frame_rate != sensor->current_fr) {
                sensor->current_fr = frame_rate;
                sensor->frame_interval = fi->interval;
                sensor->current_mode = mode;
                sensor->pending_mode_change = true;

                __v4l2_ctrl_s_ctrl_int64(sensor->ctrls.pixel_rate,
                                         ov5640_calc_pixel_rate(sensor));
        }
out:
        mutex_unlock(&sensor->lock);
        return ret;
}

static int ov5640_enum_mbus_code(struct v4l2_subdev *sd,
                                 struct v4l2_subdev_pad_config *cfg,
                                 struct v4l2_subdev_mbus_code_enum *code)
{
        if (code->pad != 0)
                return -EINVAL;
        if (code->index >= ARRAY_SIZE(ov5640_formats))
                return -EINVAL;

        code->code = ov5640_formats[code->index].code;
        return 0;
}

static int ov5640_s_stream(struct v4l2_subdev *sd, int enable)
{
        struct ov5640_dev *sensor = to_ov5640_dev(sd);
        int ret = 0;

        mutex_lock(&sensor->lock);

        if (sensor->streaming == !enable) {
                if (enable && sensor->pending_mode_change) {
                        ret = ov5640_set_mode(sensor);
                        if (ret)
                                goto out;
                }

                if (enable && sensor->pending_fmt_change) {
                        ret = ov5640_set_framefmt(sensor, &sensor->fmt);
                        if (ret)
                                goto out;
                        sensor->pending_fmt_change = false;
                }

                if (sensor->ep.bus_type == V4L2_MBUS_CSI2_DPHY)
                        ret = ov5640_set_stream_mipi(sensor, enable);
                else
                        ret = ov5640_set_stream_dvp(sensor, enable);

                if (!ret)
                        sensor->streaming = enable;
        }
out:
        mutex_unlock(&sensor->lock);
        return ret;
}

static const struct v4l2_subdev_core_ops ov5640_core_ops = {
        .s_power = ov5640_s_power,
        .log_status = v4l2_ctrl_subdev_log_status,
        .subscribe_event = v4l2_ctrl_subdev_subscribe_event,
        .unsubscribe_event = v4l2_event_subdev_unsubscribe,
};

static const struct v4l2_subdev_video_ops ov5640_video_ops = {
        .g_frame_interval = ov5640_g_frame_interval,
        .s_frame_interval = ov5640_s_frame_interval,
        .s_stream = ov5640_s_stream,
};

static const struct v4l2_subdev_pad_ops ov5640_pad_ops = {
        .enum_mbus_code = ov5640_enum_mbus_code,
        .get_fmt = ov5640_get_fmt,
        .set_fmt = ov5640_set_fmt,
        .enum_frame_size = ov5640_enum_frame_size,
        .enum_frame_interval = ov5640_enum_frame_interval,
};

static const struct v4l2_subdev_ops ov5640_subdev_ops = {
        .core = &ov5640_core_ops,
        .video = &ov5640_video_ops,
        .pad = &ov5640_pad_ops,
};

static int ov5640_get_regulators(struct ov5640_dev *sensor)

{
        int i;

        for (i = 0; i < OV5640_NUM_SUPPLIES; i++)
                sensor->supplies[i].supply = ov5640_supply_name[i];

        return devm_regulator_bulk_get(&sensor->i2c_client->dev,
                                       OV5640_NUM_SUPPLIES,
                                       sensor->supplies);
}

static int ov5640_check_chip_id(struct ov5640_dev *sensor)
{
        struct i2c_client *client = sensor->i2c_client;
        int ret = 0;
        u16 chip_id;

        ret = ov5640_set_power_on(sensor);
        if (ret)
                return ret;

        ret = ov5640_read_reg16(sensor, OV5640_REG_CHIP_ID, &chip_id);
        if (ret) {
                dev_err(&client->dev, "%s: failed to read chip identifier\n",
                        __func__);
                goto power_off;
        }

        if (chip_id != 0x5640) {
                dev_err(&client->dev, "%s: wrong chip identifier, expected 0x5640, got 0x%x\n",
                        __func__, chip_id);
                ret = -ENXIO;
        }

power_off:
        ov5640_set_power_off(sensor);
        return ret;
}

static int ov5640_probe(struct i2c_client *client)
{
        struct device *dev = &client->dev;
        struct fwnode_handle *endpoint;
        struct ov5640_dev *sensor;
        struct v4l2_mbus_framefmt *fmt;
        u32 rotation;
        int ret;

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

        sensor->i2c_client = client;

        /*
         * default init sequence initialize sensor to
         * YUV422 UYVY VGA@30fps
         */
        fmt = &sensor->fmt;
        fmt->code = MEDIA_BUS_FMT_UYVY8_2X8;
        fmt->colorspace = V4L2_COLORSPACE_SRGB;
        fmt->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(fmt->colorspace);
        fmt->quantization = V4L2_QUANTIZATION_FULL_RANGE;
        fmt->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(fmt->colorspace);
        fmt->width = 640;
        fmt->height = 480;
        fmt->field = V4L2_FIELD_NONE;
        sensor->frame_interval.numerator = 1;
        sensor->frame_interval.denominator = ov5640_framerates[OV5640_30_FPS];
        sensor->current_fr = OV5640_30_FPS;
        sensor->current_mode =
                &ov5640_mode_data[OV5640_MODE_VGA_640_480];
        sensor->last_mode = sensor->current_mode;

        sensor->ae_target = 52;

        /* optional indication of physical rotation of sensor */
        ret = fwnode_property_read_u32(dev_fwnode(&client->dev), "rotation",
                                       &rotation);
        if (!ret) {
                switch (rotation) {
                case 180:
                        sensor->upside_down = true;
                        fallthrough;
                case 0:
                        break;
                default:
                        dev_warn(dev, "%u degrees rotation is not supported, ignoring...\n",
                                 rotation);
                }
        }

        endpoint = fwnode_graph_get_next_endpoint(dev_fwnode(&client->dev),
                                                  NULL);
        if (!endpoint) {
                dev_err(dev, "endpoint node not found\n");
                return -EINVAL;
        }

        ret = v4l2_fwnode_endpoint_parse(endpoint, &sensor->ep);
        fwnode_handle_put(endpoint);
        if (ret) {
                dev_err(dev, "Could not parse endpoint\n");
                return ret;
        }

        if (sensor->ep.bus_type != V4L2_MBUS_PARALLEL &&
            sensor->ep.bus_type != V4L2_MBUS_CSI2_DPHY &&
            sensor->ep.bus_type != V4L2_MBUS_BT656) {
                dev_err(dev, "Unsupported bus type %d\n", sensor->ep.bus_type);
                return -EINVAL;
        }

        /* get system clock (xclk) */
        sensor->xclk = devm_clk_get(dev, "xclk");
        if (IS_ERR(sensor->xclk)) {
                dev_err(dev, "failed to get xclk\n");
                return PTR_ERR(sensor->xclk);
        }

        sensor->xclk_freq = clk_get_rate(sensor->xclk);
        if (sensor->xclk_freq < OV5640_XCLK_MIN ||
            sensor->xclk_freq > OV5640_XCLK_MAX) {
                dev_err(dev, "xclk frequency out of range: %d Hz\n",
                        sensor->xclk_freq);
                return -EINVAL;
        }

        /* request optional power down pin */
        sensor->pwdn_gpio = devm_gpiod_get_optional(dev, "powerdown",
                                                    GPIOD_OUT_HIGH);
        if (IS_ERR(sensor->pwdn_gpio))
                return PTR_ERR(sensor->pwdn_gpio);

        /* request optional reset pin */
        sensor->reset_gpio = devm_gpiod_get_optional(dev, "reset",
                                                     GPIOD_OUT_HIGH);
        if (IS_ERR(sensor->reset_gpio))
                return PTR_ERR(sensor->reset_gpio);

        v4l2_i2c_subdev_init(&sensor->sd, client, &ov5640_subdev_ops);

        sensor->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
                            V4L2_SUBDEV_FL_HAS_EVENTS;
        sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
        sensor->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
        ret = media_entity_pads_init(&sensor->sd.entity, 1, &sensor->pad);
        if (ret)
                return ret;

        ret = ov5640_get_regulators(sensor);
        if (ret)
                return ret;

        mutex_init(&sensor->lock);

        ret = ov5640_check_chip_id(sensor);
        if (ret)
                goto entity_cleanup;

        ret = ov5640_init_controls(sensor);
        if (ret)
                goto entity_cleanup;

        ret = v4l2_async_register_subdev_sensor(&sensor->sd);
        if (ret)
                goto free_ctrls;

        return 0;

free_ctrls:
        v4l2_ctrl_handler_free(&sensor->ctrls.handler);
entity_cleanup:
        media_entity_cleanup(&sensor->sd.entity);
        mutex_destroy(&sensor->lock);
        return ret;
}

static int ov5640_remove(struct i2c_client *client)
{
        struct v4l2_subdev *sd = i2c_get_clientdata(client);
        struct ov5640_dev *sensor = to_ov5640_dev(sd);

        v4l2_async_unregister_subdev(&sensor->sd);
        media_entity_cleanup(&sensor->sd.entity);
        v4l2_ctrl_handler_free(&sensor->ctrls.handler);
        mutex_destroy(&sensor->lock);

        return 0;
}

static const struct i2c_device_id ov5640_id[] = {
        {"ov5640", 0},
        {},
};
MODULE_DEVICE_TABLE(i2c, ov5640_id);

static const struct of_device_id ov5640_dt_ids[] = {
        { .compatible = "ovti,ov5640" },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ov5640_dt_ids);

static struct i2c_driver ov5640_i2c_driver = {
        .driver = {
                .name  = "ov5640",
                .of_match_table = ov5640_dt_ids,
        },
        .id_table = ov5640_id,
        .probe_new = ov5640_probe,
        .remove   = ov5640_remove,
};

module_i2c_driver(ov5640_i2c_driver);

MODULE_DESCRIPTION("OV5640 MIPI Camera Subdev Driver");
MODULE_LICENSE("GPL");