// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for RJ54N1CB0C CMOS Image Sensor from Sharp
 *
 * Copyright (C) 2018, Jacopo Mondi <jacopo@jmondi.org>
 *
 * Copyright (C) 2009, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/v4l2-mediabus.h>
#include <linux/videodev2.h>

#include <media/i2c/rj54n1cb0c.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-subdev.h>

#define RJ54N1_DEV_CODE                 0x0400
#define RJ54N1_DEV_CODE2                0x0401
#define RJ54N1_OUT_SEL                  0x0403
#define RJ54N1_XY_OUTPUT_SIZE_S_H       0x0404
#define RJ54N1_X_OUTPUT_SIZE_S_L        0x0405
#define RJ54N1_Y_OUTPUT_SIZE_S_L        0x0406
#define RJ54N1_XY_OUTPUT_SIZE_P_H       0x0407
#define RJ54N1_X_OUTPUT_SIZE_P_L        0x0408
#define RJ54N1_Y_OUTPUT_SIZE_P_L        0x0409
#define RJ54N1_LINE_LENGTH_PCK_S_H      0x040a
#define RJ54N1_LINE_LENGTH_PCK_S_L      0x040b
#define RJ54N1_LINE_LENGTH_PCK_P_H      0x040c
#define RJ54N1_LINE_LENGTH_PCK_P_L      0x040d
#define RJ54N1_RESIZE_N                 0x040e
#define RJ54N1_RESIZE_N_STEP            0x040f
#define RJ54N1_RESIZE_STEP              0x0410
#define RJ54N1_RESIZE_HOLD_H            0x0411
#define RJ54N1_RESIZE_HOLD_L            0x0412
#define RJ54N1_H_OBEN_OFS               0x0413
#define RJ54N1_V_OBEN_OFS               0x0414
#define RJ54N1_RESIZE_CONTROL           0x0415
#define RJ54N1_STILL_CONTROL            0x0417
#define RJ54N1_INC_USE_SEL_H            0x0425
#define RJ54N1_INC_USE_SEL_L            0x0426
#define RJ54N1_MIRROR_STILL_MODE        0x0427
#define RJ54N1_INIT_START               0x0428
#define RJ54N1_SCALE_1_2_LEV            0x0429
#define RJ54N1_SCALE_4_LEV              0x042a
#define RJ54N1_Y_GAIN                   0x04d8
#define RJ54N1_APT_GAIN_UP              0x04fa
#define RJ54N1_RA_SEL_UL                0x0530
#define RJ54N1_BYTE_SWAP                0x0531
#define RJ54N1_OUT_SIGPO                0x053b
#define RJ54N1_WB_SEL_WEIGHT_I          0x054e
#define RJ54N1_BIT8_WB                  0x0569
#define RJ54N1_HCAPS_WB                 0x056a
#define RJ54N1_VCAPS_WB                 0x056b
#define RJ54N1_HCAPE_WB                 0x056c
#define RJ54N1_VCAPE_WB                 0x056d
#define RJ54N1_EXPOSURE_CONTROL         0x058c
#define RJ54N1_FRAME_LENGTH_S_H         0x0595
#define RJ54N1_FRAME_LENGTH_S_L         0x0596
#define RJ54N1_FRAME_LENGTH_P_H         0x0597
#define RJ54N1_FRAME_LENGTH_P_L         0x0598
#define RJ54N1_PEAK_H                   0x05b7
#define RJ54N1_PEAK_50                  0x05b8
#define RJ54N1_PEAK_60                  0x05b9
#define RJ54N1_PEAK_DIFF                0x05ba
#define RJ54N1_IOC                      0x05ef
#define RJ54N1_TG_BYPASS                0x0700
#define RJ54N1_PLL_L                    0x0701
#define RJ54N1_PLL_N                    0x0702
#define RJ54N1_PLL_EN                   0x0704
#define RJ54N1_RATIO_TG                 0x0706
#define RJ54N1_RATIO_T                  0x0707
#define RJ54N1_RATIO_R                  0x0708
#define RJ54N1_RAMP_TGCLK_EN            0x0709
#define RJ54N1_OCLK_DSP                 0x0710
#define RJ54N1_RATIO_OP                 0x0711
#define RJ54N1_RATIO_O                  0x0712
#define RJ54N1_OCLK_SEL_EN              0x0713
#define RJ54N1_CLK_RST                  0x0717
#define RJ54N1_RESET_STANDBY            0x0718
#define RJ54N1_FWFLG                    0x07fe

#define E_EXCLK                         (1 << 7)
#define SOFT_STDBY                      (1 << 4)
#define SEN_RSTX                        (1 << 2)
#define TG_RSTX                         (1 << 1)
#define DSP_RSTX                        (1 << 0)

#define RESIZE_HOLD_SEL                 (1 << 2)
#define RESIZE_GO                       (1 << 1)

/*
 * When cropping, the camera automatically centers the cropped region, there
 * doesn't seem to be a way to specify an explicit location of the rectangle.
 */
#define RJ54N1_COLUMN_SKIP              0
#define RJ54N1_ROW_SKIP                 0
#define RJ54N1_MAX_WIDTH                1600
#define RJ54N1_MAX_HEIGHT               1200

#define PLL_L                           2
#define PLL_N                           0x31

/* I2C addresses: 0x50, 0x51, 0x60, 0x61 */

/* RJ54N1CB0C has only one fixed colorspace per pixelcode */
struct rj54n1_datafmt {
        u32     code;
        enum v4l2_colorspace            colorspace;
};

/* Find a data format by a pixel code in an array */
static const struct rj54n1_datafmt *rj54n1_find_datafmt(
        u32 code, const struct rj54n1_datafmt *fmt,
        int n)
{
        int i;
        for (i = 0; i < n; i++)
                if (fmt[i].code == code)
                        return fmt + i;

        return NULL;
}

static const struct rj54n1_datafmt rj54n1_colour_fmts[] = {
        {MEDIA_BUS_FMT_YUYV8_2X8, V4L2_COLORSPACE_JPEG},
        {MEDIA_BUS_FMT_YVYU8_2X8, V4L2_COLORSPACE_JPEG},
        {MEDIA_BUS_FMT_RGB565_2X8_LE, V4L2_COLORSPACE_SRGB},
        {MEDIA_BUS_FMT_RGB565_2X8_BE, V4L2_COLORSPACE_SRGB},
        {MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_LE, V4L2_COLORSPACE_SRGB},
        {MEDIA_BUS_FMT_SBGGR10_2X8_PADLO_LE, V4L2_COLORSPACE_SRGB},
        {MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_BE, V4L2_COLORSPACE_SRGB},
        {MEDIA_BUS_FMT_SBGGR10_2X8_PADLO_BE, V4L2_COLORSPACE_SRGB},
        {MEDIA_BUS_FMT_SBGGR10_1X10, V4L2_COLORSPACE_SRGB},
};

struct rj54n1_clock_div {
        u8 ratio_tg;    /* can be 0 or an odd number */
        u8 ratio_t;
        u8 ratio_r;
        u8 ratio_op;
        u8 ratio_o;
};

struct rj54n1 {
        struct v4l2_subdev subdev;
        struct v4l2_ctrl_handler hdl;
        struct clk *clk;
        struct gpio_desc *pwup_gpio;
        struct gpio_desc *enable_gpio;
        struct rj54n1_clock_div clk_div;
        const struct rj54n1_datafmt *fmt;
        struct v4l2_rect rect;  /* Sensor window */
        unsigned int tgclk_mhz;
        bool auto_wb;
        unsigned short width;   /* Output window */
        unsigned short height;
        unsigned short resize;  /* Sensor * 1024 / resize = Output */
        unsigned short scale;
        u8 bank;
};

struct rj54n1_reg_val {
        u16 reg;
        u8 val;
};

static const struct rj54n1_reg_val bank_4[] = {
        {0x417, 0},
        {0x42c, 0},
        {0x42d, 0xf0},
        {0x42e, 0},
        {0x42f, 0x50},
        {0x430, 0xf5},
        {0x431, 0x16},
        {0x432, 0x20},
        {0x433, 0},
        {0x434, 0xc8},
        {0x43c, 8},
        {0x43e, 0x90},
        {0x445, 0x83},
        {0x4ba, 0x58},
        {0x4bb, 4},
        {0x4bc, 0x20},
        {0x4db, 4},
        {0x4fe, 2},
};

static const struct rj54n1_reg_val bank_5[] = {
        {0x514, 0},
        {0x516, 0},
        {0x518, 0},
        {0x51a, 0},
        {0x51d, 0xff},
        {0x56f, 0x28},
        {0x575, 0x40},
        {0x5bc, 0x48},
        {0x5c1, 6},
        {0x5e5, 0x11},
        {0x5e6, 0x43},
        {0x5e7, 0x33},
        {0x5e8, 0x21},
        {0x5e9, 0x30},
        {0x5ea, 0x0},
        {0x5eb, 0xa5},
        {0x5ec, 0xff},
        {0x5fe, 2},
};

static const struct rj54n1_reg_val bank_7[] = {
        {0x70a, 0},
        {0x714, 0xff},
        {0x715, 0xff},
        {0x716, 0x1f},
        {0x7FE, 2},
};

static const struct rj54n1_reg_val bank_8[] = {
        {0x800, 0x00},
        {0x801, 0x01},
        {0x802, 0x61},
        {0x805, 0x00},
        {0x806, 0x00},
        {0x807, 0x00},
        {0x808, 0x00},
        {0x809, 0x01},
        {0x80A, 0x61},
        {0x80B, 0x00},
        {0x80C, 0x01},
        {0x80D, 0x00},
        {0x80E, 0x00},
        {0x80F, 0x00},
        {0x810, 0x00},
        {0x811, 0x01},
        {0x812, 0x61},
        {0x813, 0x00},
        {0x814, 0x11},
        {0x815, 0x00},
        {0x816, 0x41},
        {0x817, 0x00},
        {0x818, 0x51},
        {0x819, 0x01},
        {0x81A, 0x1F},
        {0x81B, 0x00},
        {0x81C, 0x01},
        {0x81D, 0x00},
        {0x81E, 0x11},
        {0x81F, 0x00},
        {0x820, 0x41},
        {0x821, 0x00},
        {0x822, 0x51},
        {0x823, 0x00},
        {0x824, 0x00},
        {0x825, 0x00},
        {0x826, 0x47},
        {0x827, 0x01},
        {0x828, 0x4F},
        {0x829, 0x00},
        {0x82A, 0x00},
        {0x82B, 0x00},
        {0x82C, 0x30},
        {0x82D, 0x00},
        {0x82E, 0x40},
        {0x82F, 0x00},
        {0x830, 0xB3},
        {0x831, 0x00},
        {0x832, 0xE3},
        {0x833, 0x00},
        {0x834, 0x00},
        {0x835, 0x00},
        {0x836, 0x00},
        {0x837, 0x00},
        {0x838, 0x00},
        {0x839, 0x01},
        {0x83A, 0x61},
        {0x83B, 0x00},
        {0x83C, 0x01},
        {0x83D, 0x00},
        {0x83E, 0x00},
        {0x83F, 0x00},
        {0x840, 0x00},
        {0x841, 0x01},
        {0x842, 0x61},
        {0x843, 0x00},
        {0x844, 0x1D},
        {0x845, 0x00},
        {0x846, 0x00},
        {0x847, 0x00},
        {0x848, 0x00},
        {0x849, 0x01},
        {0x84A, 0x1F},
        {0x84B, 0x00},
        {0x84C, 0x05},
        {0x84D, 0x00},
        {0x84E, 0x19},
        {0x84F, 0x01},
        {0x850, 0x21},
        {0x851, 0x01},
        {0x852, 0x5D},
        {0x853, 0x00},
        {0x854, 0x00},
        {0x855, 0x00},
        {0x856, 0x19},
        {0x857, 0x01},
        {0x858, 0x21},
        {0x859, 0x00},
        {0x85A, 0x00},
        {0x85B, 0x00},
        {0x85C, 0x00},
        {0x85D, 0x00},
        {0x85E, 0x00},
        {0x85F, 0x00},
        {0x860, 0xB3},
        {0x861, 0x00},
        {0x862, 0xE3},
        {0x863, 0x00},
        {0x864, 0x00},
        {0x865, 0x00},
        {0x866, 0x00},
        {0x867, 0x00},
        {0x868, 0x00},
        {0x869, 0xE2},
        {0x86A, 0x00},
        {0x86B, 0x01},
        {0x86C, 0x06},
        {0x86D, 0x00},
        {0x86E, 0x00},
        {0x86F, 0x00},
        {0x870, 0x60},
        {0x871, 0x8C},
        {0x872, 0x10},
        {0x873, 0x00},
        {0x874, 0xE0},
        {0x875, 0x00},
        {0x876, 0x27},
        {0x877, 0x01},
        {0x878, 0x00},
        {0x879, 0x00},
        {0x87A, 0x00},
        {0x87B, 0x03},
        {0x87C, 0x00},
        {0x87D, 0x00},
        {0x87E, 0x00},
        {0x87F, 0x00},
        {0x880, 0x00},
        {0x881, 0x00},
        {0x882, 0x00},
        {0x883, 0x00},
        {0x884, 0x00},
        {0x885, 0x00},
        {0x886, 0xF8},
        {0x887, 0x00},
        {0x888, 0x03},
        {0x889, 0x00},
        {0x88A, 0x64},
        {0x88B, 0x00},
        {0x88C, 0x03},
        {0x88D, 0x00},
        {0x88E, 0xB1},
        {0x88F, 0x00},
        {0x890, 0x03},
        {0x891, 0x01},
        {0x892, 0x1D},
        {0x893, 0x00},
        {0x894, 0x03},
        {0x895, 0x01},
        {0x896, 0x4B},
        {0x897, 0x00},
        {0x898, 0xE5},
        {0x899, 0x00},
        {0x89A, 0x01},
        {0x89B, 0x00},
        {0x89C, 0x01},
        {0x89D, 0x04},
        {0x89E, 0xC8},
        {0x89F, 0x00},
        {0x8A0, 0x01},
        {0x8A1, 0x01},
        {0x8A2, 0x61},
        {0x8A3, 0x00},
        {0x8A4, 0x01},
        {0x8A5, 0x00},
        {0x8A6, 0x00},
        {0x8A7, 0x00},
        {0x8A8, 0x00},
        {0x8A9, 0x00},
        {0x8AA, 0x7F},
        {0x8AB, 0x03},
        {0x8AC, 0x00},
        {0x8AD, 0x00},
        {0x8AE, 0x00},
        {0x8AF, 0x00},
        {0x8B0, 0x00},
        {0x8B1, 0x00},
        {0x8B6, 0x00},
        {0x8B7, 0x01},
        {0x8B8, 0x00},
        {0x8B9, 0x00},
        {0x8BA, 0x02},
        {0x8BB, 0x00},
        {0x8BC, 0xFF},
        {0x8BD, 0x00},
        {0x8FE, 2},
};

static const struct rj54n1_reg_val bank_10[] = {
        {0x10bf, 0x69}
};

/* Clock dividers - these are default register values, divider = register + 1 */
static const struct rj54n1_clock_div clk_div = {
        .ratio_tg       = 3 /* default: 5 */,
        .ratio_t        = 4 /* default: 1 */,
        .ratio_r        = 4 /* default: 0 */,
        .ratio_op       = 1 /* default: 5 */,
        .ratio_o        = 9 /* default: 0 */,
};

static struct rj54n1 *to_rj54n1(const struct i2c_client *client)
{
        return container_of(i2c_get_clientdata(client), struct rj54n1, subdev);
}

static int reg_read(struct i2c_client *client, const u16 reg)
{
        struct rj54n1 *rj54n1 = to_rj54n1(client);
        int ret;

        /* set bank */
        if (rj54n1->bank != reg >> 8) {
                dev_dbg(&client->dev, "[0x%x] = 0x%x\n", 0xff, reg >> 8);
                ret = i2c_smbus_write_byte_data(client, 0xff, reg >> 8);
                if (ret < 0)
                        return ret;
                rj54n1->bank = reg >> 8;
        }
        return i2c_smbus_read_byte_data(client, reg & 0xff);
}

static int reg_write(struct i2c_client *client, const u16 reg,
                     const u8 data)
{
        struct rj54n1 *rj54n1 = to_rj54n1(client);
        int ret;

        /* set bank */
        if (rj54n1->bank != reg >> 8) {
                dev_dbg(&client->dev, "[0x%x] = 0x%x\n", 0xff, reg >> 8);
                ret = i2c_smbus_write_byte_data(client, 0xff, reg >> 8);
                if (ret < 0)
                        return ret;
                rj54n1->bank = reg >> 8;
        }
        dev_dbg(&client->dev, "[0x%x] = 0x%x\n", reg & 0xff, data);
        return i2c_smbus_write_byte_data(client, reg & 0xff, data);
}

static int reg_set(struct i2c_client *client, const u16 reg,
                   const u8 data, const u8 mask)
{
        int ret;

        ret = reg_read(client, reg);
        if (ret < 0)
                return ret;
        return reg_write(client, reg, (ret & ~mask) | (data & mask));
}

static int reg_write_multiple(struct i2c_client *client,
                              const struct rj54n1_reg_val *rv, const int n)
{
        int i, ret;

        for (i = 0; i < n; i++) {
                ret = reg_write(client, rv->reg, rv->val);
                if (ret < 0)
                        return ret;
                rv++;
        }

        return 0;
}

static int rj54n1_enum_mbus_code(struct v4l2_subdev *sd,
                struct v4l2_subdev_state *sd_state,
                struct v4l2_subdev_mbus_code_enum *code)
{
        if (code->pad || code->index >= ARRAY_SIZE(rj54n1_colour_fmts))
                return -EINVAL;

        code->code = rj54n1_colour_fmts[code->index].code;
        return 0;
}

static int rj54n1_s_stream(struct v4l2_subdev *sd, int enable)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);

        /* Switch between preview and still shot modes */
        return reg_set(client, RJ54N1_STILL_CONTROL, (!enable) << 7, 0x80);
}

static int rj54n1_set_rect(struct i2c_client *client,
                           u16 reg_x, u16 reg_y, u16 reg_xy,
                           u32 width, u32 height)
{
        int ret;

        ret = reg_write(client, reg_xy,
                        ((width >> 4) & 0x70) |
                        ((height >> 8) & 7));

        if (!ret)
                ret = reg_write(client, reg_x, width & 0xff);
        if (!ret)
                ret = reg_write(client, reg_y, height & 0xff);

        return ret;
}

/*
 * Some commands, specifically certain initialisation sequences, require
 * a commit operation.
 */
static int rj54n1_commit(struct i2c_client *client)
{
        int ret = reg_write(client, RJ54N1_INIT_START, 1);
        msleep(10);
        if (!ret)
                ret = reg_write(client, RJ54N1_INIT_START, 0);
        return ret;
}

static int rj54n1_sensor_scale(struct v4l2_subdev *sd, s32 *in_w, s32 *in_h,
                               s32 *out_w, s32 *out_h);

static int rj54n1_set_selection(struct v4l2_subdev *sd,
                                struct v4l2_subdev_state *sd_state,
                                struct v4l2_subdev_selection *sel)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct rj54n1 *rj54n1 = to_rj54n1(client);
        const struct v4l2_rect *rect = &sel->r;
        int output_w, output_h, input_w = rect->width, input_h = rect->height;
        int ret;

        if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE ||
            sel->target != V4L2_SEL_TGT_CROP)
                return -EINVAL;

        /* arbitrary minimum width and height, edges unimportant */
        v4l_bound_align_image(&input_w, 8, RJ54N1_MAX_WIDTH, 0,
                              &input_h, 8, RJ54N1_MAX_HEIGHT, 0, 0);

        output_w = (input_w * 1024 + rj54n1->resize / 2) / rj54n1->resize;
        output_h = (input_h * 1024 + rj54n1->resize / 2) / rj54n1->resize;

        dev_dbg(&client->dev, "Scaling for %dx%d : %u = %dx%d\n",
                input_w, input_h, rj54n1->resize, output_w, output_h);

        ret = rj54n1_sensor_scale(sd, &input_w, &input_h, &output_w, &output_h);
        if (ret < 0)
                return ret;

        rj54n1->width           = output_w;
        rj54n1->height          = output_h;
        rj54n1->resize          = ret;
        rj54n1->rect.width      = input_w;
        rj54n1->rect.height     = input_h;

        return 0;
}

static int rj54n1_get_selection(struct v4l2_subdev *sd,
                                struct v4l2_subdev_state *sd_state,
                                struct v4l2_subdev_selection *sel)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct rj54n1 *rj54n1 = to_rj54n1(client);

        if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
                return -EINVAL;

        switch (sel->target) {
        case V4L2_SEL_TGT_CROP_BOUNDS:
                sel->r.left = RJ54N1_COLUMN_SKIP;
                sel->r.top = RJ54N1_ROW_SKIP;
                sel->r.width = RJ54N1_MAX_WIDTH;
                sel->r.height = RJ54N1_MAX_HEIGHT;
                return 0;
        case V4L2_SEL_TGT_CROP:
                sel->r = rj54n1->rect;
                return 0;
        default:
                return -EINVAL;
        }
}

static int rj54n1_get_fmt(struct v4l2_subdev *sd,
                struct v4l2_subdev_state *sd_state,
                struct v4l2_subdev_format *format)
{
        struct v4l2_mbus_framefmt *mf = &format->format;
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct rj54n1 *rj54n1 = to_rj54n1(client);

        if (format->pad)
                return -EINVAL;

        mf->code        = rj54n1->fmt->code;
        mf->colorspace  = rj54n1->fmt->colorspace;
        mf->ycbcr_enc   = V4L2_YCBCR_ENC_601;
        mf->xfer_func   = V4L2_XFER_FUNC_SRGB;
        mf->quantization = V4L2_QUANTIZATION_DEFAULT;
        mf->field       = V4L2_FIELD_NONE;
        mf->width       = rj54n1->width;
        mf->height      = rj54n1->height;

        return 0;
}

/*
 * The actual geometry configuration routine. It scales the input window into
 * the output one, updates the window sizes and returns an error or the resize
 * coefficient on success. Note: we only use the "Fixed Scaling" on this camera.
 */
static int rj54n1_sensor_scale(struct v4l2_subdev *sd, s32 *in_w, s32 *in_h,
                               s32 *out_w, s32 *out_h)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct rj54n1 *rj54n1 = to_rj54n1(client);
        unsigned int skip, resize, input_w = *in_w, input_h = *in_h,
                output_w = *out_w, output_h = *out_h;
        u16 inc_sel, wb_bit8, wb_left, wb_right, wb_top, wb_bottom;
        unsigned int peak, peak_50, peak_60;
        int ret;

        /*
         * We have a problem with crops, where the window is larger than 512x384
         * and output window is larger than a half of the input one. In this
         * case we have to either reduce the input window to equal or below
         * 512x384 or the output window to equal or below 1/2 of the input.
         */
        if (output_w > max(512U, input_w / 2)) {
                if (2 * output_w > RJ54N1_MAX_WIDTH) {
                        input_w = RJ54N1_MAX_WIDTH;
                        output_w = RJ54N1_MAX_WIDTH / 2;
                } else {
                        input_w = output_w * 2;
                }

                dev_dbg(&client->dev, "Adjusted output width: in %u, out %u\n",
                        input_w, output_w);
        }

        if (output_h > max(384U, input_h / 2)) {
                if (2 * output_h > RJ54N1_MAX_HEIGHT) {
                        input_h = RJ54N1_MAX_HEIGHT;
                        output_h = RJ54N1_MAX_HEIGHT / 2;
                } else {
                        input_h = output_h * 2;
                }

                dev_dbg(&client->dev, "Adjusted output height: in %u, out %u\n",
                        input_h, output_h);
        }

        /* Idea: use the read mode for snapshots, handle separate geometries */
        ret = rj54n1_set_rect(client, RJ54N1_X_OUTPUT_SIZE_S_L,
                              RJ54N1_Y_OUTPUT_SIZE_S_L,
                              RJ54N1_XY_OUTPUT_SIZE_S_H, output_w, output_h);
        if (!ret)
                ret = rj54n1_set_rect(client, RJ54N1_X_OUTPUT_SIZE_P_L,
                              RJ54N1_Y_OUTPUT_SIZE_P_L,
                              RJ54N1_XY_OUTPUT_SIZE_P_H, output_w, output_h);

        if (ret < 0)
                return ret;

        if (output_w > input_w && output_h > input_h) {
                input_w = output_w;
                input_h = output_h;

                resize = 1024;
        } else {
                unsigned int resize_x, resize_y;
                resize_x = (input_w * 1024 + output_w / 2) / output_w;
                resize_y = (input_h * 1024 + output_h / 2) / output_h;

                /* We want max(resize_x, resize_y), check if it still fits */
                if (resize_x > resize_y &&
                    (output_h * resize_x + 512) / 1024 > RJ54N1_MAX_HEIGHT)
                        resize = (RJ54N1_MAX_HEIGHT * 1024 + output_h / 2) /
                                output_h;
                else if (resize_y > resize_x &&
                         (output_w * resize_y + 512) / 1024 > RJ54N1_MAX_WIDTH)
                        resize = (RJ54N1_MAX_WIDTH * 1024 + output_w / 2) /
                                output_w;
                else
                        resize = max(resize_x, resize_y);

                /* Prohibited value ranges */
                switch (resize) {
                case 2040 ... 2047:
                        resize = 2039;
                        break;
                case 4080 ... 4095:
                        resize = 4079;
                        break;
                case 8160 ... 8191:
                        resize = 8159;
                        break;
                case 16320 ... 16384:
                        resize = 16319;
                }
        }

        /* Set scaling */
        ret = reg_write(client, RJ54N1_RESIZE_HOLD_L, resize & 0xff);
        if (!ret)
                ret = reg_write(client, RJ54N1_RESIZE_HOLD_H, resize >> 8);

        if (ret < 0)
                return ret;

        /*
         * Configure a skipping bitmask. The sensor will select a skipping value
         * among set bits automatically. This is very unclear in the datasheet
         * too. I was told, in this register one enables all skipping values,
         * that are required for a specific resize, and the camera selects
         * automatically, which ones to use. But it is unclear how to identify,
         * which cropping values are needed. Secondly, why don't we just set all
         * bits and let the camera choose? Would it increase processing time and
         * reduce the framerate? Using 0xfffc for INC_USE_SEL doesn't seem to
         * improve the image quality or stability for larger frames (see comment
         * above), but I didn't check the framerate.
         */
        skip = min(resize / 1024, 15U);

        inc_sel = 1 << skip;

        if (inc_sel <= 2)
                inc_sel = 0xc;
        else if (resize & 1023 && skip < 15)
                inc_sel |= 1 << (skip + 1);

        ret = reg_write(client, RJ54N1_INC_USE_SEL_L, inc_sel & 0xfc);
        if (!ret)
                ret = reg_write(client, RJ54N1_INC_USE_SEL_H, inc_sel >> 8);

        if (!rj54n1->auto_wb) {
                /* Auto white balance window */
                wb_left   = output_w / 16;
                wb_right  = (3 * output_w / 4 - 3) / 4;
                wb_top    = output_h / 16;
                wb_bottom = (3 * output_h / 4 - 3) / 4;
                wb_bit8   = ((wb_left >> 2) & 0x40) | ((wb_top >> 4) & 0x10) |
                        ((wb_right >> 6) & 4) | ((wb_bottom >> 8) & 1);

                if (!ret)
                        ret = reg_write(client, RJ54N1_BIT8_WB, wb_bit8);
                if (!ret)
                        ret = reg_write(client, RJ54N1_HCAPS_WB, wb_left);
                if (!ret)
                        ret = reg_write(client, RJ54N1_VCAPS_WB, wb_top);
                if (!ret)
                        ret = reg_write(client, RJ54N1_HCAPE_WB, wb_right);
                if (!ret)
                        ret = reg_write(client, RJ54N1_VCAPE_WB, wb_bottom);
        }

        /* Antiflicker */
        peak = 12 * RJ54N1_MAX_WIDTH * (1 << 14) * resize / rj54n1->tgclk_mhz /
                10000;
        peak_50 = peak / 6;
        peak_60 = peak / 5;

        if (!ret)
                ret = reg_write(client, RJ54N1_PEAK_H,
                                ((peak_50 >> 4) & 0xf0) | (peak_60 >> 8));
        if (!ret)
                ret = reg_write(client, RJ54N1_PEAK_50, peak_50);
        if (!ret)
                ret = reg_write(client, RJ54N1_PEAK_60, peak_60);
        if (!ret)
                ret = reg_write(client, RJ54N1_PEAK_DIFF, peak / 150);

        /* Start resizing */
        if (!ret)
                ret = reg_write(client, RJ54N1_RESIZE_CONTROL,
                                RESIZE_HOLD_SEL | RESIZE_GO | 1);

        if (ret < 0)
                return ret;

        /* Constant taken from manufacturer's example */
        msleep(230);

        ret = reg_write(client, RJ54N1_RESIZE_CONTROL, RESIZE_HOLD_SEL | 1);
        if (ret < 0)
                return ret;

        *in_w = (output_w * resize + 512) / 1024;
        *in_h = (output_h * resize + 512) / 1024;
        *out_w = output_w;
        *out_h = output_h;

        dev_dbg(&client->dev, "Scaled for %dx%d : %u = %ux%u, skip %u\n",
                *in_w, *in_h, resize, output_w, output_h, skip);

        return resize;
}

static int rj54n1_set_clock(struct i2c_client *client)
{
        struct rj54n1 *rj54n1 = to_rj54n1(client);
        int ret;

        /* Enable external clock */
        ret = reg_write(client, RJ54N1_RESET_STANDBY, E_EXCLK | SOFT_STDBY);
        /* Leave stand-by. Note: use this when implementing suspend / resume */
        if (!ret)
                ret = reg_write(client, RJ54N1_RESET_STANDBY, E_EXCLK);

        if (!ret)
                ret = reg_write(client, RJ54N1_PLL_L, PLL_L);
        if (!ret)
                ret = reg_write(client, RJ54N1_PLL_N, PLL_N);

        /* TGCLK dividers */
        if (!ret)
                ret = reg_write(client, RJ54N1_RATIO_TG,
                                rj54n1->clk_div.ratio_tg);
        if (!ret)
                ret = reg_write(client, RJ54N1_RATIO_T,
                                rj54n1->clk_div.ratio_t);
        if (!ret)
                ret = reg_write(client, RJ54N1_RATIO_R,
                                rj54n1->clk_div.ratio_r);

        /* Enable TGCLK & RAMP */
        if (!ret)
                ret = reg_write(client, RJ54N1_RAMP_TGCLK_EN, 3);

        /* Disable clock output */
        if (!ret)
                ret = reg_write(client, RJ54N1_OCLK_DSP, 0);

        /* Set divisors */
        if (!ret)
                ret = reg_write(client, RJ54N1_RATIO_OP,
                                rj54n1->clk_div.ratio_op);
        if (!ret)
                ret = reg_write(client, RJ54N1_RATIO_O,
                                rj54n1->clk_div.ratio_o);

        /* Enable OCLK */
        if (!ret)
                ret = reg_write(client, RJ54N1_OCLK_SEL_EN, 1);

        /* Use PLL for Timing Generator, write 2 to reserved bits */
        if (!ret)
                ret = reg_write(client, RJ54N1_TG_BYPASS, 2);

        /* Take sensor out of reset */
        if (!ret)
                ret = reg_write(client, RJ54N1_RESET_STANDBY,
                                E_EXCLK | SEN_RSTX);
        /* Enable PLL */
        if (!ret)
                ret = reg_write(client, RJ54N1_PLL_EN, 1);

        /* Wait for PLL to stabilise */
        msleep(10);

        /* Enable clock to frequency divider */
        if (!ret)
                ret = reg_write(client, RJ54N1_CLK_RST, 1);

        if (!ret)
                ret = reg_read(client, RJ54N1_CLK_RST);
        if (ret != 1) {
                dev_err(&client->dev,
                        "Resetting RJ54N1CB0C clock failed: %d!\n", ret);
                return -EIO;
        }

        /* Start the PLL */
        ret = reg_set(client, RJ54N1_OCLK_DSP, 1, 1);

        /* Enable OCLK */
        if (!ret)
                ret = reg_write(client, RJ54N1_OCLK_SEL_EN, 1);

        return ret;
}

static int rj54n1_reg_init(struct i2c_client *client)
{
        struct rj54n1 *rj54n1 = to_rj54n1(client);
        int ret = rj54n1_set_clock(client);

        if (!ret)
                ret = reg_write_multiple(client, bank_7, ARRAY_SIZE(bank_7));
        if (!ret)
                ret = reg_write_multiple(client, bank_10, ARRAY_SIZE(bank_10));

        /* Set binning divisors */
        if (!ret)
                ret = reg_write(client, RJ54N1_SCALE_1_2_LEV, 3 | (7 << 4));
        if (!ret)
                ret = reg_write(client, RJ54N1_SCALE_4_LEV, 0xf);

        /* Switch to fixed resize mode */
        if (!ret)
                ret = reg_write(client, RJ54N1_RESIZE_CONTROL,
                                RESIZE_HOLD_SEL | 1);

        /* Set gain */
        if (!ret)
                ret = reg_write(client, RJ54N1_Y_GAIN, 0x84);

        /*
         * Mirror the image back: default is upside down and left-to-right...
         * Set manual preview / still shot switching
         */
        if (!ret)
                ret = reg_write(client, RJ54N1_MIRROR_STILL_MODE, 0x27);

        if (!ret)
                ret = reg_write_multiple(client, bank_4, ARRAY_SIZE(bank_4));

        /* Auto exposure area */
        if (!ret)
                ret = reg_write(client, RJ54N1_EXPOSURE_CONTROL, 0x80);
        /* Check current auto WB config */
        if (!ret)
                ret = reg_read(client, RJ54N1_WB_SEL_WEIGHT_I);
        if (ret >= 0) {
                rj54n1->auto_wb = ret & 0x80;
                ret = reg_write_multiple(client, bank_5, ARRAY_SIZE(bank_5));
        }
        if (!ret)
                ret = reg_write_multiple(client, bank_8, ARRAY_SIZE(bank_8));

        if (!ret)
                ret = reg_write(client, RJ54N1_RESET_STANDBY,
                                E_EXCLK | DSP_RSTX | SEN_RSTX);

        /* Commit init */
        if (!ret)
                ret = rj54n1_commit(client);

        /* Take DSP, TG, sensor out of reset */
        if (!ret)
                ret = reg_write(client, RJ54N1_RESET_STANDBY,
                                E_EXCLK | DSP_RSTX | TG_RSTX | SEN_RSTX);

        /* Start register update? Same register as 0x?FE in many bank_* sets */
        if (!ret)
                ret = reg_write(client, RJ54N1_FWFLG, 2);

        /* Constant taken from manufacturer's example */
        msleep(700);

        return ret;
}

static int rj54n1_set_fmt(struct v4l2_subdev *sd,
                struct v4l2_subdev_state *sd_state,
                struct v4l2_subdev_format *format)
{
        struct v4l2_mbus_framefmt *mf = &format->format;
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct rj54n1 *rj54n1 = to_rj54n1(client);
        const struct rj54n1_datafmt *fmt;
        int output_w, output_h, max_w, max_h,
                input_w = rj54n1->rect.width, input_h = rj54n1->rect.height;
        int align = mf->code == MEDIA_BUS_FMT_SBGGR10_1X10 ||
                mf->code == MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_BE ||
                mf->code == MEDIA_BUS_FMT_SBGGR10_2X8_PADLO_BE ||
                mf->code == MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_LE ||
                mf->code == MEDIA_BUS_FMT_SBGGR10_2X8_PADLO_LE;
        int ret;

        if (format->pad)
                return -EINVAL;

        dev_dbg(&client->dev, "%s: code = %d, width = %u, height = %u\n",
                __func__, mf->code, mf->width, mf->height);

        fmt = rj54n1_find_datafmt(mf->code, rj54n1_colour_fmts,
                                  ARRAY_SIZE(rj54n1_colour_fmts));
        if (!fmt) {
                fmt = rj54n1->fmt;
                mf->code = fmt->code;
        }

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

        v4l_bound_align_image(&mf->width, 112, RJ54N1_MAX_WIDTH, align,
                              &mf->height, 84, RJ54N1_MAX_HEIGHT, align, 0);

        if (format->which == V4L2_SUBDEV_FORMAT_TRY)
                return 0;

        /*
         * Verify if the sensor has just been powered on. TODO: replace this
         * with proper PM, when a suitable API is available.
         */
        ret = reg_read(client, RJ54N1_RESET_STANDBY);
        if (ret < 0)
                return ret;

        if (!(ret & E_EXCLK)) {
                ret = rj54n1_reg_init(client);
                if (ret < 0)
                        return ret;
        }

        /* RA_SEL_UL is only relevant for raw modes, ignored otherwise. */
        switch (mf->code) {
        case MEDIA_BUS_FMT_YUYV8_2X8:
                ret = reg_write(client, RJ54N1_OUT_SEL, 0);
                if (!ret)
                        ret = reg_set(client, RJ54N1_BYTE_SWAP, 8, 8);
                break;
        case MEDIA_BUS_FMT_YVYU8_2X8:
                ret = reg_write(client, RJ54N1_OUT_SEL, 0);
                if (!ret)
                        ret = reg_set(client, RJ54N1_BYTE_SWAP, 0, 8);
                break;
        case MEDIA_BUS_FMT_RGB565_2X8_LE:
                ret = reg_write(client, RJ54N1_OUT_SEL, 0x11);
                if (!ret)
                        ret = reg_set(client, RJ54N1_BYTE_SWAP, 8, 8);
                break;
        case MEDIA_BUS_FMT_RGB565_2X8_BE:
                ret = reg_write(client, RJ54N1_OUT_SEL, 0x11);
                if (!ret)
                        ret = reg_set(client, RJ54N1_BYTE_SWAP, 0, 8);
                break;
        case MEDIA_BUS_FMT_SBGGR10_2X8_PADLO_LE:
                ret = reg_write(client, RJ54N1_OUT_SEL, 4);
                if (!ret)
                        ret = reg_set(client, RJ54N1_BYTE_SWAP, 8, 8);
                if (!ret)
                        ret = reg_write(client, RJ54N1_RA_SEL_UL, 0);
                break;
        case MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_LE:
                ret = reg_write(client, RJ54N1_OUT_SEL, 4);
                if (!ret)
                        ret = reg_set(client, RJ54N1_BYTE_SWAP, 8, 8);
                if (!ret)
                        ret = reg_write(client, RJ54N1_RA_SEL_UL, 8);
                break;
        case MEDIA_BUS_FMT_SBGGR10_2X8_PADLO_BE:
                ret = reg_write(client, RJ54N1_OUT_SEL, 4);
                if (!ret)
                        ret = reg_set(client, RJ54N1_BYTE_SWAP, 0, 8);
                if (!ret)
                        ret = reg_write(client, RJ54N1_RA_SEL_UL, 0);
                break;
        case MEDIA_BUS_FMT_SBGGR10_2X8_PADHI_BE:
                ret = reg_write(client, RJ54N1_OUT_SEL, 4);
                if (!ret)
                        ret = reg_set(client, RJ54N1_BYTE_SWAP, 0, 8);
                if (!ret)
                        ret = reg_write(client, RJ54N1_RA_SEL_UL, 8);
                break;
        case MEDIA_BUS_FMT_SBGGR10_1X10:
                ret = reg_write(client, RJ54N1_OUT_SEL, 5);
                break;
        default:
                ret = -EINVAL;
        }

        /* Special case: a raw mode with 10 bits of data per clock tick */
        if (!ret)
                ret = reg_set(client, RJ54N1_OCLK_SEL_EN,
                              (mf->code == MEDIA_BUS_FMT_SBGGR10_1X10) << 1, 2);

        if (ret < 0)
                return ret;

        /* Supported scales 1:1 >= scale > 1:16 */
        max_w = mf->width * (16 * 1024 - 1) / 1024;
        if (input_w > max_w)
                input_w = max_w;
        max_h = mf->height * (16 * 1024 - 1) / 1024;
        if (input_h > max_h)
                input_h = max_h;

        output_w = mf->width;
        output_h = mf->height;

        ret = rj54n1_sensor_scale(sd, &input_w, &input_h, &output_w, &output_h);
        if (ret < 0)
                return ret;

        fmt = rj54n1_find_datafmt(mf->code, rj54n1_colour_fmts,
                                  ARRAY_SIZE(rj54n1_colour_fmts));

        rj54n1->fmt             = fmt;
        rj54n1->resize          = ret;
        rj54n1->rect.width      = input_w;
        rj54n1->rect.height     = input_h;
        rj54n1->width           = output_w;
        rj54n1->height          = output_h;

        mf->width               = output_w;
        mf->height              = output_h;
        mf->field               = V4L2_FIELD_NONE;
        mf->colorspace          = fmt->colorspace;

        return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int rj54n1_g_register(struct v4l2_subdev *sd,
                             struct v4l2_dbg_register *reg)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);

        if (reg->reg < 0x400 || reg->reg > 0x1fff)
                /* Registers > 0x0800 are only available from Sharp support */
                return -EINVAL;

        reg->size = 1;
        reg->val = reg_read(client, reg->reg);

        if (reg->val > 0xff)
                return -EIO;

        return 0;
}

static int rj54n1_s_register(struct v4l2_subdev *sd,
                             const struct v4l2_dbg_register *reg)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);

        if (reg->reg < 0x400 || reg->reg > 0x1fff)
                /* Registers >= 0x0800 are only available from Sharp support */
                return -EINVAL;

        if (reg_write(client, reg->reg, reg->val) < 0)
                return -EIO;

        return 0;
}
#endif

static int rj54n1_s_power(struct v4l2_subdev *sd, int on)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct rj54n1 *rj54n1 = to_rj54n1(client);

        if (on) {
                if (rj54n1->pwup_gpio)
                        gpiod_set_value(rj54n1->pwup_gpio, 1);
                if (rj54n1->enable_gpio)
                        gpiod_set_value(rj54n1->enable_gpio, 1);

                msleep(1);

                return clk_prepare_enable(rj54n1->clk);
        }

        clk_disable_unprepare(rj54n1->clk);

        if (rj54n1->enable_gpio)
                gpiod_set_value(rj54n1->enable_gpio, 0);
        if (rj54n1->pwup_gpio)
                gpiod_set_value(rj54n1->pwup_gpio, 0);

        return 0;
}

static int rj54n1_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct rj54n1 *rj54n1 = container_of(ctrl->handler, struct rj54n1, hdl);
        struct v4l2_subdev *sd = &rj54n1->subdev;
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int data;

        switch (ctrl->id) {
        case V4L2_CID_VFLIP:
                if (ctrl->val)
                        data = reg_set(client, RJ54N1_MIRROR_STILL_MODE, 0, 1);
                else
                        data = reg_set(client, RJ54N1_MIRROR_STILL_MODE, 1, 1);
                if (data < 0)
                        return -EIO;
                return 0;
        case V4L2_CID_HFLIP:
                if (ctrl->val)
                        data = reg_set(client, RJ54N1_MIRROR_STILL_MODE, 0, 2);
                else
                        data = reg_set(client, RJ54N1_MIRROR_STILL_MODE, 2, 2);
                if (data < 0)
                        return -EIO;
                return 0;
        case V4L2_CID_GAIN:
                if (reg_write(client, RJ54N1_Y_GAIN, ctrl->val * 2) < 0)
                        return -EIO;
                return 0;
        case V4L2_CID_AUTO_WHITE_BALANCE:
                /* Auto WB area - whole image */
                if (reg_set(client, RJ54N1_WB_SEL_WEIGHT_I, ctrl->val << 7,
                            0x80) < 0)
                        return -EIO;
                rj54n1->auto_wb = ctrl->val;
                return 0;
        }

        return -EINVAL;
}

static const struct v4l2_ctrl_ops rj54n1_ctrl_ops = {
        .s_ctrl = rj54n1_s_ctrl,
};

static const struct v4l2_subdev_core_ops rj54n1_subdev_core_ops = {
#ifdef CONFIG_VIDEO_ADV_DEBUG
        .g_register     = rj54n1_g_register,
        .s_register     = rj54n1_s_register,
#endif
        .s_power        = rj54n1_s_power,
};

static const struct v4l2_subdev_video_ops rj54n1_subdev_video_ops = {
        .s_stream       = rj54n1_s_stream,
};

static const struct v4l2_subdev_pad_ops rj54n1_subdev_pad_ops = {
        .enum_mbus_code = rj54n1_enum_mbus_code,
        .get_selection  = rj54n1_get_selection,
        .set_selection  = rj54n1_set_selection,
        .get_fmt        = rj54n1_get_fmt,
        .set_fmt        = rj54n1_set_fmt,
};

static const struct v4l2_subdev_ops rj54n1_subdev_ops = {
        .core   = &rj54n1_subdev_core_ops,
        .video  = &rj54n1_subdev_video_ops,
        .pad    = &rj54n1_subdev_pad_ops,
};

/*
 * Interface active, can use i2c. If it fails, it can indeed mean, that
 * this wasn't our capture interface, so, we wait for the right one
 */
static int rj54n1_video_probe(struct i2c_client *client,
                              struct rj54n1_pdata *priv)
{
        struct rj54n1 *rj54n1 = to_rj54n1(client);
        int data1, data2;
        int ret;

        ret = rj54n1_s_power(&rj54n1->subdev, 1);
        if (ret < 0)
                return ret;

        /* Read out the chip version register */
        data1 = reg_read(client, RJ54N1_DEV_CODE);
        data2 = reg_read(client, RJ54N1_DEV_CODE2);

        if (data1 != 0x51 || data2 != 0x10) {
                ret = -ENODEV;
                dev_info(&client->dev, "No RJ54N1CB0C found, read 0x%x:0x%x\n",
                         data1, data2);
                goto done;
        }

        /* Configure IOCTL polarity from the platform data: 0 or 1 << 7. */
        ret = reg_write(client, RJ54N1_IOC, priv->ioctl_high << 7);
        if (ret < 0)
                goto done;

        dev_info(&client->dev, "Detected a RJ54N1CB0C chip ID 0x%x:0x%x\n",
                 data1, data2);

        ret = v4l2_ctrl_handler_setup(&rj54n1->hdl);

done:
        rj54n1_s_power(&rj54n1->subdev, 0);
        return ret;
}

static int rj54n1_probe(struct i2c_client *client)
{
        struct rj54n1 *rj54n1;
        struct i2c_adapter *adapter = client->adapter;
        struct rj54n1_pdata *rj54n1_priv;
        int ret;

        if (!client->dev.platform_data) {
                dev_err(&client->dev, "RJ54N1CB0C: missing platform data!\n");
                return -EINVAL;
        }

        rj54n1_priv = client->dev.platform_data;

        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
                dev_warn(&adapter->dev,
                         "I2C-Adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");
                return -EIO;
        }

        rj54n1 = devm_kzalloc(&client->dev, sizeof(struct rj54n1), GFP_KERNEL);
        if (!rj54n1)
                return -ENOMEM;

        v4l2_i2c_subdev_init(&rj54n1->subdev, client, &rj54n1_subdev_ops);
        v4l2_ctrl_handler_init(&rj54n1->hdl, 4);
        v4l2_ctrl_new_std(&rj54n1->hdl, &rj54n1_ctrl_ops,
                        V4L2_CID_VFLIP, 0, 1, 1, 0);
        v4l2_ctrl_new_std(&rj54n1->hdl, &rj54n1_ctrl_ops,
                        V4L2_CID_HFLIP, 0, 1, 1, 0);
        v4l2_ctrl_new_std(&rj54n1->hdl, &rj54n1_ctrl_ops,
                        V4L2_CID_GAIN, 0, 127, 1, 66);
        v4l2_ctrl_new_std(&rj54n1->hdl, &rj54n1_ctrl_ops,
                        V4L2_CID_AUTO_WHITE_BALANCE, 0, 1, 1, 1);

        if (rj54n1->hdl.error) {
                ret = rj54n1->hdl.error;
                goto err_free_ctrl;
        }

        rj54n1->subdev.ctrl_handler = &rj54n1->hdl;
        rj54n1->clk_div         = clk_div;
        rj54n1->rect.left       = RJ54N1_COLUMN_SKIP;
        rj54n1->rect.top        = RJ54N1_ROW_SKIP;
        rj54n1->rect.width      = RJ54N1_MAX_WIDTH;
        rj54n1->rect.height     = RJ54N1_MAX_HEIGHT;
        rj54n1->width           = RJ54N1_MAX_WIDTH;
        rj54n1->height          = RJ54N1_MAX_HEIGHT;
        rj54n1->fmt             = &rj54n1_colour_fmts[0];
        rj54n1->resize          = 1024;
        rj54n1->tgclk_mhz       = (rj54n1_priv->mclk_freq / PLL_L * PLL_N) /
                (clk_div.ratio_tg + 1) / (clk_div.ratio_t + 1);

        rj54n1->clk = clk_get(&client->dev, NULL);
        if (IS_ERR(rj54n1->clk)) {
                ret = PTR_ERR(rj54n1->clk);
                goto err_free_ctrl;
        }

        rj54n1->pwup_gpio = gpiod_get_optional(&client->dev, "powerup",
                                               GPIOD_OUT_LOW);
        if (IS_ERR(rj54n1->pwup_gpio)) {
                dev_info(&client->dev, "Unable to get GPIO \"powerup\": %pe\n",
                         rj54n1->pwup_gpio);
                ret = PTR_ERR(rj54n1->pwup_gpio);
                goto err_clk_put;
        }

        rj54n1->enable_gpio = gpiod_get_optional(&client->dev, "enable",
                                                 GPIOD_OUT_LOW);
        if (IS_ERR(rj54n1->enable_gpio)) {
                dev_info(&client->dev, "Unable to get GPIO \"enable\": %pe\n",
                         rj54n1->enable_gpio);
                ret = PTR_ERR(rj54n1->enable_gpio);
                goto err_gpio_put;
        }

        ret = rj54n1_video_probe(client, rj54n1_priv);
        if (ret < 0)
                goto err_gpio_put;

        ret = v4l2_async_register_subdev(&rj54n1->subdev);
        if (ret)
                goto err_gpio_put;

        return 0;

err_gpio_put:
        if (rj54n1->enable_gpio)
                gpiod_put(rj54n1->enable_gpio);

        if (rj54n1->pwup_gpio)
                gpiod_put(rj54n1->pwup_gpio);

err_clk_put:
        clk_put(rj54n1->clk);

err_free_ctrl:
        v4l2_ctrl_handler_free(&rj54n1->hdl);

        return ret;
}

static void rj54n1_remove(struct i2c_client *client)
{
        struct rj54n1 *rj54n1 = to_rj54n1(client);

        if (rj54n1->enable_gpio)
                gpiod_put(rj54n1->enable_gpio);
        if (rj54n1->pwup_gpio)
                gpiod_put(rj54n1->pwup_gpio);

        clk_put(rj54n1->clk);
        v4l2_ctrl_handler_free(&rj54n1->hdl);
        v4l2_async_unregister_subdev(&rj54n1->subdev);
}

static const struct i2c_device_id rj54n1_id[] = {
        { "rj54n1cb0c" },
        { }
};
MODULE_DEVICE_TABLE(i2c, rj54n1_id);

static struct i2c_driver rj54n1_i2c_driver = {
        .driver = {
                .name = "rj54n1cb0c",
        },
        .probe          = rj54n1_probe,
        .remove         = rj54n1_remove,
        .id_table       = rj54n1_id,
};

module_i2c_driver(rj54n1_i2c_driver);

MODULE_DESCRIPTION("Sharp RJ54N1CB0C Camera driver");
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_LICENSE("GPL v2");