// SPDX-License-Identifier: GPL-2.0
/*
 * Support for OmniVision OV5693 1080p HD camera sensor.
 *
 * Copyright (c) 2013 Intel Corporation. All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/moduleparam.h>
#include <media/v4l2-device.h>
#include <linux/io.h>
#include <linux/acpi.h>
#include "../../include/linux/atomisp_gmin_platform.h"

#include "ov5693.h"
#include "ad5823.h"

#define __cci_delay(t) \
        do { \
                if ((t) < 10) { \
                        usleep_range((t) * 1000, ((t) + 1) * 1000); \
                } else { \
                        msleep((t)); \
                } \
        } while (0)

/* Value 30ms reached through experimentation on byt ecs.
 * The DS specifies a much lower value but when using a smaller value
 * the I2C bus sometimes locks up permanently when starting the camera.
 * This issue could not be reproduced on cht, so we can reduce the
 * delay value to a lower value when insmod.
 */
static uint up_delay = 30;
module_param(up_delay, uint, 0644);
MODULE_PARM_DESC(up_delay,
                 "Delay prior to the first CCI transaction for ov5693");

static int vcm_ad_i2c_wr8(struct i2c_client *client, u8 reg, u8 val)
{
        int err;
        struct i2c_msg msg;
        u8 buf[2];

        buf[0] = reg;
        buf[1] = val;

        msg.addr = VCM_ADDR;
        msg.flags = 0;
        msg.len = 2;
        msg.buf = &buf[0];

        err = i2c_transfer(client->adapter, &msg, 1);
        if (err != 1) {
                dev_err(&client->dev, "%s: vcm i2c fail, err code = %d\n",
                        __func__, err);
                return -EIO;
        }
        return 0;
}

static int ad5823_i2c_write(struct i2c_client *client, u8 reg, u8 val)
{
        struct i2c_msg msg;
        u8 buf[2];

        buf[0] = reg;
        buf[1] = val;
        msg.addr = AD5823_VCM_ADDR;
        msg.flags = 0;
        msg.len = 0x02;
        msg.buf = &buf[0];

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

static int ad5823_i2c_read(struct i2c_client *client, u8 reg, u8 *val)
{
        struct i2c_msg msg[2];
        u8 buf[2];

        buf[0] = reg;
        buf[1] = 0;

        msg[0].addr = AD5823_VCM_ADDR;
        msg[0].flags = 0;
        msg[0].len = 0x01;
        msg[0].buf = &buf[0];

        msg[1].addr = 0x0c;
        msg[1].flags = I2C_M_RD;
        msg[1].len = 0x01;
        msg[1].buf = &buf[1];
        *val = 0;
        if (i2c_transfer(client->adapter, msg, 2) != 2)
                return -EIO;
        *val = buf[1];
        return 0;
}

static const u32 ov5693_embedded_effective_size = 28;

/* i2c read/write stuff */
static int ov5693_read_reg(struct i2c_client *client,
                           u16 data_length, u16 reg, u16 *val)
{
        int err;
        struct i2c_msg msg[2];
        unsigned char data[6];

        if (!client->adapter) {
                dev_err(&client->dev, "%s error, no client->adapter\n",
                        __func__);
                return -ENODEV;
        }

        if (data_length != OV5693_8BIT && data_length != OV5693_16BIT
            && data_length != OV5693_32BIT) {
                dev_err(&client->dev, "%s error, invalid data length\n",
                        __func__);
                return -EINVAL;
        }

        memset(msg, 0, sizeof(msg));

        msg[0].addr = client->addr;
        msg[0].flags = 0;
        msg[0].len = I2C_MSG_LENGTH;
        msg[0].buf = data;

        /* high byte goes out first */
        data[0] = (u8)(reg >> 8);
        data[1] = (u8)(reg & 0xff);

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

        err = i2c_transfer(client->adapter, msg, 2);
        if (err != 2) {
                if (err >= 0)
                        err = -EIO;
                dev_err(&client->dev,
                        "read from offset 0x%x error %d", reg, err);
                return err;
        }

        *val = 0;
        /* high byte comes first */
        if (data_length == OV5693_8BIT)
                *val = (u8)data[0];
        else if (data_length == OV5693_16BIT)
                *val = be16_to_cpu(*(__be16 *)&data[0]);
        else
                *val = be32_to_cpu(*(__be32 *)&data[0]);

        return 0;
}

static int ov5693_i2c_write(struct i2c_client *client, u16 len, u8 *data)
{
        struct i2c_msg msg;
        const int num_msg = 1;
        int ret;

        msg.addr = client->addr;
        msg.flags = 0;
        msg.len = len;
        msg.buf = data;
        ret = i2c_transfer(client->adapter, &msg, 1);

        return ret == num_msg ? 0 : -EIO;
}

static int vcm_dw_i2c_write(struct i2c_client *client, u16 data)
{
        struct i2c_msg msg;
        const int num_msg = 1;
        int ret;
        __be16 val;

        val = cpu_to_be16(data);
        msg.addr = VCM_ADDR;
        msg.flags = 0;
        msg.len = OV5693_16BIT;
        msg.buf = (void *)&val;

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

        return ret == num_msg ? 0 : -EIO;
}

/*
 * Theory: per datasheet, the two VCMs both allow for a 2-byte read.
 * The DW9714 doesn't actually specify what this does (it has a
 * two-byte write-only protocol, but specifies the read sequence as
 * legal), but it returns the same data (zeroes) always, after an
 * undocumented initial NAK.  The AD5823 has a one-byte address
 * register to which all writes go, and subsequent reads will cycle
 * through the 8 bytes of registers.  Notably, the default values (the
 * device is always power-cycled affirmatively, so we can rely on
 * these) in AD5823 are not pairwise repetitions of the same 16 bit
 * word.  So all we have to do is sequentially read two bytes at a
 * time and see if we detect a difference in any of the first four
 * pairs.
 */
static int vcm_detect(struct i2c_client *client)
{
        int i, ret;
        struct i2c_msg msg;
        u16 data0 = 0, data;

        for (i = 0; i < 4; i++) {
                msg.addr = VCM_ADDR;
                msg.flags = I2C_M_RD;
                msg.len = sizeof(data);
                msg.buf = (u8 *)&data;
                ret = i2c_transfer(client->adapter, &msg, 1);

                /*
                 * DW9714 always fails the first read and returns
                 * zeroes for subsequent ones
                 */
                if (i == 0 && ret == -EREMOTEIO) {
                        data0 = 0;
                        continue;
                }

                if (i == 0)
                        data0 = data;

                if (data != data0)
                        return VCM_AD5823;
        }
        return ret == 1 ? VCM_DW9714 : ret;
}

static int ov5693_write_reg(struct i2c_client *client, u16 data_length,
                            u16 reg, u16 val)
{
        int ret;
        unsigned char data[4] = {0};
        __be16 *wreg = (void *)data;
        const u16 len = data_length + sizeof(u16); /* 16-bit address + data */

        if (data_length != OV5693_8BIT && data_length != OV5693_16BIT) {
                dev_err(&client->dev,
                        "%s error, invalid data_length\n", __func__);
                return -EINVAL;
        }

        /* high byte goes out first */
        *wreg = cpu_to_be16(reg);

        if (data_length == OV5693_8BIT) {
                data[2] = (u8)(val);
        } else {
                /* OV5693_16BIT */
                __be16 *wdata = (void *)&data[2];

                *wdata = cpu_to_be16(val);
        }

        ret = ov5693_i2c_write(client, len, data);
        if (ret)
                dev_err(&client->dev,
                        "write error: wrote 0x%x to offset 0x%x error %d",
                        val, reg, ret);

        return ret;
}

/*
 * ov5693_write_reg_array - Initializes a list of OV5693 registers
 * @client: i2c driver client structure
 * @reglist: list of registers to be written
 *
 * This function initializes a list of registers. When consecutive addresses
 * are found in a row on the list, this function creates a buffer and sends
 * consecutive data in a single i2c_transfer().
 *
 * __ov5693_flush_reg_array, __ov5693_buf_reg_array() and
 * __ov5693_write_reg_is_consecutive() are internal functions to
 * ov5693_write_reg_array_fast() and should be not used anywhere else.
 *
 */

static int __ov5693_flush_reg_array(struct i2c_client *client,
                                    struct ov5693_write_ctrl *ctrl)
{
        u16 size;
        __be16 *reg = (void *)&ctrl->buffer.addr;

        if (ctrl->index == 0)
                return 0;

        size = sizeof(u16) + ctrl->index; /* 16-bit address + data */

        *reg = cpu_to_be16(ctrl->buffer.addr);
        ctrl->index = 0;

        return ov5693_i2c_write(client, size, (u8 *)reg);
}

static int __ov5693_buf_reg_array(struct i2c_client *client,
                                  struct ov5693_write_ctrl *ctrl,
                                  const struct ov5693_reg *next)
{
        int size;
        __be16 *data16;

        switch (next->type) {
        case OV5693_8BIT:
                size = 1;
                ctrl->buffer.data[ctrl->index] = (u8)next->val;
                break;
        case OV5693_16BIT:
                size = 2;

                data16 = (void *)&ctrl->buffer.data[ctrl->index];
                *data16 = cpu_to_be16((u16)next->val);
                break;
        default:
                return -EINVAL;
        }

        /* When first item is added, we need to store its starting address */
        if (ctrl->index == 0)
                ctrl->buffer.addr = next->reg;

        ctrl->index += size;

        /*
         * Buffer cannot guarantee free space for u32? Better flush it to avoid
         * possible lack of memory for next item.
         */
        if (ctrl->index + sizeof(u16) >= OV5693_MAX_WRITE_BUF_SIZE)
                return __ov5693_flush_reg_array(client, ctrl);

        return 0;
}

static int __ov5693_write_reg_is_consecutive(struct i2c_client *client,
        struct ov5693_write_ctrl *ctrl,
        const struct ov5693_reg *next)
{
        if (ctrl->index == 0)
                return 1;

        return ctrl->buffer.addr + ctrl->index == next->reg;
}

static int ov5693_write_reg_array(struct i2c_client *client,
                                  const struct ov5693_reg *reglist)
{
        const struct ov5693_reg *next = reglist;
        struct ov5693_write_ctrl ctrl;
        int err;

        ctrl.index = 0;
        for (; next->type != OV5693_TOK_TERM; next++) {
                switch (next->type & OV5693_TOK_MASK) {
                case OV5693_TOK_DELAY:
                        err = __ov5693_flush_reg_array(client, &ctrl);
                        if (err)
                                return err;
                        msleep(next->val);
                        break;
                default:
                        /*
                         * If next address is not consecutive, data needs to be
                         * flushed before proceed.
                         */
                        if (!__ov5693_write_reg_is_consecutive(client, &ctrl,
                                                               next)) {
                                err = __ov5693_flush_reg_array(client, &ctrl);
                                if (err)
                                        return err;
                        }
                        err = __ov5693_buf_reg_array(client, &ctrl, next);
                        if (err) {
                                dev_err(&client->dev,
                                        "%s: write error, aborted\n",
                                        __func__);
                                return err;
                        }
                        break;
                }
        }

        return __ov5693_flush_reg_array(client, &ctrl);
}

static int ov5693_g_focal(struct v4l2_subdev *sd, s32 *val)
{
        *val = (OV5693_FOCAL_LENGTH_NUM << 16) | OV5693_FOCAL_LENGTH_DEM;
        return 0;
}

static int ov5693_g_fnumber(struct v4l2_subdev *sd, s32 *val)
{
        /*const f number for imx*/
        *val = (OV5693_F_NUMBER_DEFAULT_NUM << 16) | OV5693_F_NUMBER_DEM;
        return 0;
}

static int ov5693_g_fnumber_range(struct v4l2_subdev *sd, s32 *val)
{
        *val = (OV5693_F_NUMBER_DEFAULT_NUM << 24) |
               (OV5693_F_NUMBER_DEM << 16) |
               (OV5693_F_NUMBER_DEFAULT_NUM << 8) | OV5693_F_NUMBER_DEM;
        return 0;
}

static int ov5693_g_bin_factor_x(struct v4l2_subdev *sd, s32 *val)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);

        *val = ov5693_res[dev->fmt_idx].bin_factor_x;

        return 0;
}

static int ov5693_g_bin_factor_y(struct v4l2_subdev *sd, s32 *val)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);

        *val = ov5693_res[dev->fmt_idx].bin_factor_y;

        return 0;
}

static int ov5693_get_intg_factor(struct i2c_client *client,
                                  struct camera_mipi_info *info,
                                  const struct ov5693_resolution *res)
{
        struct v4l2_subdev *sd = i2c_get_clientdata(client);
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        struct atomisp_sensor_mode_data *buf = &info->data;
        unsigned int pix_clk_freq_hz;
        u16 reg_val;
        int ret;

        if (!info)
                return -EINVAL;

        /* pixel clock */
        pix_clk_freq_hz = res->pix_clk_freq * 1000000;

        dev->vt_pix_clk_freq_mhz = pix_clk_freq_hz;
        buf->vt_pix_clk_freq_mhz = pix_clk_freq_hz;

        /* get integration time */
        buf->coarse_integration_time_min = OV5693_COARSE_INTG_TIME_MIN;
        buf->coarse_integration_time_max_margin =
            OV5693_COARSE_INTG_TIME_MAX_MARGIN;

        buf->fine_integration_time_min = OV5693_FINE_INTG_TIME_MIN;
        buf->fine_integration_time_max_margin =
            OV5693_FINE_INTG_TIME_MAX_MARGIN;

        buf->fine_integration_time_def = OV5693_FINE_INTG_TIME_MIN;
        buf->frame_length_lines = res->lines_per_frame;
        buf->line_length_pck = res->pixels_per_line;
        buf->read_mode = res->bin_mode;

        /* get the cropping and output resolution to ISP for this mode. */
        ret =  ov5693_read_reg(client, OV5693_16BIT,
                               OV5693_HORIZONTAL_START_H, &reg_val);
        if (ret)
                return ret;
        buf->crop_horizontal_start = reg_val;

        ret =  ov5693_read_reg(client, OV5693_16BIT,
                               OV5693_VERTICAL_START_H, &reg_val);
        if (ret)
                return ret;
        buf->crop_vertical_start = reg_val;

        ret = ov5693_read_reg(client, OV5693_16BIT,
                              OV5693_HORIZONTAL_END_H, &reg_val);
        if (ret)
                return ret;
        buf->crop_horizontal_end = reg_val;

        ret = ov5693_read_reg(client, OV5693_16BIT,
                              OV5693_VERTICAL_END_H, &reg_val);
        if (ret)
                return ret;
        buf->crop_vertical_end = reg_val;

        ret = ov5693_read_reg(client, OV5693_16BIT,
                              OV5693_HORIZONTAL_OUTPUT_SIZE_H, &reg_val);
        if (ret)
                return ret;
        buf->output_width = reg_val;

        ret = ov5693_read_reg(client, OV5693_16BIT,
                              OV5693_VERTICAL_OUTPUT_SIZE_H, &reg_val);
        if (ret)
                return ret;
        buf->output_height = reg_val;

        buf->binning_factor_x = res->bin_factor_x ?
                                res->bin_factor_x : 1;
        buf->binning_factor_y = res->bin_factor_y ?
                                res->bin_factor_y : 1;
        return 0;
}

static long __ov5693_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
                                  int gain, int digitgain)

{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        u16 vts, hts;
        int ret, exp_val;

        hts = ov5693_res[dev->fmt_idx].pixels_per_line;
        vts = ov5693_res[dev->fmt_idx].lines_per_frame;
        /*
         * If coarse_itg is larger than 1<<15, can not write to reg directly.
         * The way is to write coarse_itg/2 to the reg, meanwhile write 2*hts
         * to the reg.
         */
        if (coarse_itg > (1 << 15)) {
                hts = hts * 2;
                coarse_itg = (int)coarse_itg / 2;
        }
        /* group hold */
        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_GROUP_ACCESS, 0x00);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV5693_GROUP_ACCESS);
                return ret;
        }

        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_TIMING_HTS_H, (hts >> 8) & 0xFF);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV5693_TIMING_HTS_H);
                return ret;
        }

        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_TIMING_HTS_L, hts & 0xFF);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV5693_TIMING_HTS_L);
                return ret;
        }
        /* Increase the VTS to match exposure + MARGIN */
        if (coarse_itg > vts - OV5693_INTEGRATION_TIME_MARGIN)
                vts = (u16)coarse_itg + OV5693_INTEGRATION_TIME_MARGIN;

        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_TIMING_VTS_H, (vts >> 8) & 0xFF);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV5693_TIMING_VTS_H);
                return ret;
        }

        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_TIMING_VTS_L, vts & 0xFF);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV5693_TIMING_VTS_L);
                return ret;
        }

        /* set exposure */

        /* Lower four bit should be 0*/
        exp_val = coarse_itg << 4;
        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_EXPOSURE_L, exp_val & 0xFF);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV5693_EXPOSURE_L);
                return ret;
        }

        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_EXPOSURE_M, (exp_val >> 8) & 0xFF);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV5693_EXPOSURE_M);
                return ret;
        }

        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_EXPOSURE_H, (exp_val >> 16) & 0x0F);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV5693_EXPOSURE_H);
                return ret;
        }

        /* Analog gain */
        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_AGC_L, gain & 0xff);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV5693_AGC_L);
                return ret;
        }

        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_AGC_H, (gain >> 8) & 0xff);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV5693_AGC_H);
                return ret;
        }

        /* Digital gain */
        if (digitgain) {
                ret = ov5693_write_reg(client, OV5693_16BIT,
                                       OV5693_MWB_RED_GAIN_H, digitgain);
                if (ret) {
                        dev_err(&client->dev, "%s: write %x error, aborted\n",
                                __func__, OV5693_MWB_RED_GAIN_H);
                        return ret;
                }

                ret = ov5693_write_reg(client, OV5693_16BIT,
                                       OV5693_MWB_GREEN_GAIN_H, digitgain);
                if (ret) {
                        dev_err(&client->dev, "%s: write %x error, aborted\n",
                                __func__, OV5693_MWB_RED_GAIN_H);
                        return ret;
                }

                ret = ov5693_write_reg(client, OV5693_16BIT,
                                       OV5693_MWB_BLUE_GAIN_H, digitgain);
                if (ret) {
                        dev_err(&client->dev, "%s: write %x error, aborted\n",
                                __func__, OV5693_MWB_RED_GAIN_H);
                        return ret;
                }
        }

        /* End group */
        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_GROUP_ACCESS, 0x10);
        if (ret)
                return ret;

        /* Delay launch group */
        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_GROUP_ACCESS, 0xa0);
        if (ret)
                return ret;
        return ret;
}

static int ov5693_set_exposure(struct v4l2_subdev *sd, int exposure,
                               int gain, int digitgain)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        int ret;

        mutex_lock(&dev->input_lock);
        ret = __ov5693_set_exposure(sd, exposure, gain, digitgain);
        mutex_unlock(&dev->input_lock);

        return ret;
}

static long ov5693_s_exposure(struct v4l2_subdev *sd,
                              struct atomisp_exposure *exposure)
{
        u16 coarse_itg = exposure->integration_time[0];
        u16 analog_gain = exposure->gain[0];
        u16 digital_gain = exposure->gain[1];

        /* we should not accept the invalid value below */
        if (analog_gain == 0) {
                struct i2c_client *client = v4l2_get_subdevdata(sd);

                v4l2_err(client, "%s: invalid value\n", __func__);
                return -EINVAL;
        }
        return ov5693_set_exposure(sd, coarse_itg, analog_gain, digital_gain);
}

static int ov5693_read_otp_reg_array(struct i2c_client *client, u16 size,
                                     u16 addr, u8 *buf)
{
        u16 index;
        int ret;
        u16 *pVal = NULL;

        for (index = 0; index <= size; index++) {
                pVal = (u16 *)(buf + index);
                ret =
                    ov5693_read_reg(client, OV5693_8BIT, addr + index,
                                    pVal);
                if (ret)
                        return ret;
        }

        return 0;
}

static int __ov5693_otp_read(struct v4l2_subdev *sd, u8 *buf)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        int ret;
        int i;
        u8 *b = buf;

        dev->otp_size = 0;
        for (i = 1; i < OV5693_OTP_BANK_MAX; i++) {
                /*set bank NO and OTP read mode. */
                ret = ov5693_write_reg(client, OV5693_8BIT, OV5693_OTP_BANK_REG,
                                       (i | 0xc0));     //[7:6] 2'b11 [5:0] bank no
                if (ret) {
                        dev_err(&client->dev, "failed to prepare OTP page\n");
                        return ret;
                }
                //pr_debug("write 0x%x->0x%x\n",OV5693_OTP_BANK_REG,(i|0xc0));

                /*enable read */
                ret = ov5693_write_reg(client, OV5693_8BIT, OV5693_OTP_READ_REG,
                                       OV5693_OTP_MODE_READ);   // enable :1
                if (ret) {
                        dev_err(&client->dev,
                                "failed to set OTP reading mode page");
                        return ret;
                }
                //pr_debug("write 0x%x->0x%x\n",OV5693_OTP_READ_REG,OV5693_OTP_MODE_READ);

                /* Reading the OTP data array */
                ret = ov5693_read_otp_reg_array(client, OV5693_OTP_BANK_SIZE,
                                                OV5693_OTP_START_ADDR,
                                                b);
                if (ret) {
                        dev_err(&client->dev, "failed to read OTP data\n");
                        return ret;
                }

                //pr_debug("BANK[%2d] %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", i, *b, *(b+1), *(b+2), *(b+3), *(b+4), *(b+5), *(b+6), *(b+7), *(b+8), *(b+9), *(b+10), *(b+11), *(b+12), *(b+13), *(b+14), *(b+15));

                //Intel OTP map, try to read 320byts first.
                if (i == 21) {
                        if ((*b) == 0) {
                                dev->otp_size = 320;
                                break;
                        } else {
                                b = buf;
                                continue;
                        }
                } else if (i ==
                           24) {                //if the first 320bytes data doesn't not exist, try to read the next 32bytes data.
                        if ((*b) == 0) {
                                dev->otp_size = 32;
                                break;
                        } else {
                                b = buf;
                                continue;
                        }
                } else if (i ==
                           27) {                //if the prvious 32bytes data doesn't exist, try to read the next 32bytes data again.
                        if ((*b) == 0) {
                                dev->otp_size = 32;
                                break;
                        } else {
                                dev->otp_size = 0;      // no OTP data.
                                break;
                        }
                }

                b = b + OV5693_OTP_BANK_SIZE;
        }
        return 0;
}

/*
 * Read otp data and store it into a kmalloced buffer.
 * The caller must kfree the buffer when no more needed.
 * @size: set to the size of the returned otp data.
 */
static void *ov5693_otp_read(struct v4l2_subdev *sd)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        u8 *buf;
        int ret;

        buf = devm_kzalloc(&client->dev, (OV5693_OTP_DATA_SIZE + 16), GFP_KERNEL);
        if (!buf)
                return ERR_PTR(-ENOMEM);

        //otp valid after mipi on and sw stream on
        ret = ov5693_write_reg(client, OV5693_8BIT, OV5693_FRAME_OFF_NUM, 0x00);

        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_SW_STREAM, OV5693_START_STREAMING);

        ret = __ov5693_otp_read(sd, buf);

        //mipi off and sw stream off after otp read
        ret = ov5693_write_reg(client, OV5693_8BIT, OV5693_FRAME_OFF_NUM, 0x0f);

        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_SW_STREAM, OV5693_STOP_STREAMING);

        /* Driver has failed to find valid data */
        if (ret) {
                dev_err(&client->dev, "sensor found no valid OTP data\n");
                return ERR_PTR(ret);
        }

        return buf;
}

static int ov5693_g_priv_int_data(struct v4l2_subdev *sd,
                                  struct v4l2_private_int_data *priv)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        u8 __user *to = priv->data;
        u32 read_size = priv->size;
        int ret;

        /* No need to copy data if size is 0 */
        if (!read_size)
                goto out;

        if (IS_ERR(dev->otp_data)) {
                dev_err(&client->dev, "OTP data not available");
                return PTR_ERR(dev->otp_data);
        }

        /* Correct read_size value only if bigger than maximum */
        if (read_size > OV5693_OTP_DATA_SIZE)
                read_size = OV5693_OTP_DATA_SIZE;

        ret = copy_to_user(to, dev->otp_data, read_size);
        if (ret) {
                dev_err(&client->dev, "%s: failed to copy OTP data to user\n",
                        __func__);
                return -EFAULT;
        }

        pr_debug("%s read_size:%d\n", __func__, read_size);

out:
        /* Return correct size */
        priv->size = dev->otp_size;

        return 0;
}

static long ov5693_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
{
        switch (cmd) {
        case ATOMISP_IOC_S_EXPOSURE:
                return ov5693_s_exposure(sd, arg);
        case ATOMISP_IOC_G_SENSOR_PRIV_INT_DATA:
                return ov5693_g_priv_int_data(sd, arg);
        default:
                return -EINVAL;
        }
        return 0;
}

/*
 * This returns the exposure time being used. This should only be used
 * for filling in EXIF data, not for actual image processing.
 */
static int ov5693_q_exposure(struct v4l2_subdev *sd, s32 *value)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        u16 reg_v, reg_v2;
        int ret;

        /* get exposure */
        ret = ov5693_read_reg(client, OV5693_8BIT,
                              OV5693_EXPOSURE_L,
                              &reg_v);
        if (ret)
                goto err;

        ret = ov5693_read_reg(client, OV5693_8BIT,
                              OV5693_EXPOSURE_M,
                              &reg_v2);
        if (ret)
                goto err;

        reg_v += reg_v2 << 8;
        ret = ov5693_read_reg(client, OV5693_8BIT,
                              OV5693_EXPOSURE_H,
                              &reg_v2);
        if (ret)
                goto err;

        *value = reg_v + (((u32)reg_v2 << 16));
err:
        return ret;
}

static int ad5823_t_focus_vcm(struct v4l2_subdev *sd, u16 val)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret;
        u8 vcm_code;

        ret = ad5823_i2c_read(client, AD5823_REG_VCM_CODE_MSB, &vcm_code);
        if (ret)
                return ret;

        /* set reg VCM_CODE_MSB Bit[1:0] */
        vcm_code = (vcm_code & VCM_CODE_MSB_MASK) |
                   ((val >> 8) & ~VCM_CODE_MSB_MASK);
        ret = ad5823_i2c_write(client, AD5823_REG_VCM_CODE_MSB, vcm_code);
        if (ret)
                return ret;

        /* set reg VCM_CODE_LSB Bit[7:0] */
        ret = ad5823_i2c_write(client, AD5823_REG_VCM_CODE_LSB, (val & 0xff));
        if (ret)
                return ret;

        /* set required vcm move time */
        vcm_code = AD5823_RESONANCE_PERIOD / AD5823_RESONANCE_COEF
                   - AD5823_HIGH_FREQ_RANGE;
        ret = ad5823_i2c_write(client, AD5823_REG_VCM_MOVE_TIME, vcm_code);

        return ret;
}

static int ad5823_t_focus_abs(struct v4l2_subdev *sd, s32 value)
{
        value = min(value, AD5823_MAX_FOCUS_POS);
        return ad5823_t_focus_vcm(sd, value);
}

static int ov5693_t_focus_abs(struct v4l2_subdev *sd, s32 value)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret = 0;

        dev_dbg(&client->dev, "%s: FOCUS_POS: 0x%x\n", __func__, value);
        value = clamp(value, 0, OV5693_VCM_MAX_FOCUS_POS);
        if (dev->vcm == VCM_DW9714) {
                if (dev->vcm_update) {
                        ret = vcm_dw_i2c_write(client, VCM_PROTECTION_OFF);
                        if (ret)
                                return ret;
                        ret = vcm_dw_i2c_write(client, DIRECT_VCM);
                        if (ret)
                                return ret;
                        ret = vcm_dw_i2c_write(client, VCM_PROTECTION_ON);
                        if (ret)
                                return ret;
                        dev->vcm_update = false;
                }
                ret = vcm_dw_i2c_write(client,
                                       vcm_val(value, VCM_DEFAULT_S));
        } else if (dev->vcm == VCM_AD5823) {
                ad5823_t_focus_abs(sd, value);
        }
        if (ret == 0) {
                dev->number_of_steps = value - dev->focus;
                dev->focus = value;
                dev->timestamp_t_focus_abs = ktime_get();
        } else
                dev_err(&client->dev,
                        "%s: i2c failed. ret %d\n", __func__, ret);

        return ret;
}

static int ov5693_t_focus_rel(struct v4l2_subdev *sd, s32 value)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);

        return ov5693_t_focus_abs(sd, dev->focus + value);
}

#define DELAY_PER_STEP_NS       1000000
#define DELAY_MAX_PER_STEP_NS   (1000000 * 1023)
static int ov5693_q_focus_status(struct v4l2_subdev *sd, s32 *value)
{
        u32 status = 0;
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        ktime_t temptime;
        ktime_t timedelay = ns_to_ktime(min_t(u32,
                                              abs(dev->number_of_steps) * DELAY_PER_STEP_NS,
                                              DELAY_MAX_PER_STEP_NS));

        temptime = ktime_sub(ktime_get(), (dev->timestamp_t_focus_abs));
        if (ktime_compare(temptime, timedelay) <= 0) {
                status |= ATOMISP_FOCUS_STATUS_MOVING;
                status |= ATOMISP_FOCUS_HP_IN_PROGRESS;
        } else {
                status |= ATOMISP_FOCUS_STATUS_ACCEPTS_NEW_MOVE;
                status |= ATOMISP_FOCUS_HP_COMPLETE;
        }

        *value = status;

        return 0;
}

static int ov5693_q_focus_abs(struct v4l2_subdev *sd, s32 *value)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        s32 val;

        ov5693_q_focus_status(sd, &val);

        if (val & ATOMISP_FOCUS_STATUS_MOVING)
                *value  = dev->focus - dev->number_of_steps;
        else
                *value  = dev->focus;

        return 0;
}

static int ov5693_t_vcm_slew(struct v4l2_subdev *sd, s32 value)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);

        dev->number_of_steps = value;
        dev->vcm_update = true;
        return 0;
}

static int ov5693_t_vcm_timing(struct v4l2_subdev *sd, s32 value)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);

        dev->number_of_steps = value;
        dev->vcm_update = true;
        return 0;
}

static int ov5693_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct ov5693_device *dev =
            container_of(ctrl->handler, struct ov5693_device, ctrl_handler);
        struct i2c_client *client = v4l2_get_subdevdata(&dev->sd);
        int ret = 0;

        switch (ctrl->id) {
        case V4L2_CID_FOCUS_ABSOLUTE:
                dev_dbg(&client->dev, "%s: CID_FOCUS_ABSOLUTE:%d.\n",
                        __func__, ctrl->val);
                ret = ov5693_t_focus_abs(&dev->sd, ctrl->val);
                break;
        case V4L2_CID_FOCUS_RELATIVE:
                dev_dbg(&client->dev, "%s: CID_FOCUS_RELATIVE:%d.\n",
                        __func__, ctrl->val);
                ret = ov5693_t_focus_rel(&dev->sd, ctrl->val);
                break;
        case V4L2_CID_VCM_SLEW:
                ret = ov5693_t_vcm_slew(&dev->sd, ctrl->val);
                break;
        case V4L2_CID_VCM_TIMING:
                ret = ov5693_t_vcm_timing(&dev->sd, ctrl->val);
                break;
        default:
                ret = -EINVAL;
        }
        return ret;
}

static int ov5693_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
{
        struct ov5693_device *dev =
            container_of(ctrl->handler, struct ov5693_device, ctrl_handler);
        int ret = 0;

        switch (ctrl->id) {
        case V4L2_CID_EXPOSURE_ABSOLUTE:
                ret = ov5693_q_exposure(&dev->sd, &ctrl->val);
                break;
        case V4L2_CID_FOCAL_ABSOLUTE:
                ret = ov5693_g_focal(&dev->sd, &ctrl->val);
                break;
        case V4L2_CID_FNUMBER_ABSOLUTE:
                ret = ov5693_g_fnumber(&dev->sd, &ctrl->val);
                break;
        case V4L2_CID_FNUMBER_RANGE:
                ret = ov5693_g_fnumber_range(&dev->sd, &ctrl->val);
                break;
        case V4L2_CID_FOCUS_ABSOLUTE:
                ret = ov5693_q_focus_abs(&dev->sd, &ctrl->val);
                break;
        case V4L2_CID_FOCUS_STATUS:
                ret = ov5693_q_focus_status(&dev->sd, &ctrl->val);
                break;
        case V4L2_CID_BIN_FACTOR_HORZ:
                ret = ov5693_g_bin_factor_x(&dev->sd, &ctrl->val);
                break;
        case V4L2_CID_BIN_FACTOR_VERT:
                ret = ov5693_g_bin_factor_y(&dev->sd, &ctrl->val);
                break;
        default:
                ret = -EINVAL;
        }

        return ret;
}

static const struct v4l2_ctrl_ops ctrl_ops = {
        .s_ctrl = ov5693_s_ctrl,
        .g_volatile_ctrl = ov5693_g_volatile_ctrl
};

static const struct v4l2_ctrl_config ov5693_controls[] = {
        {
                .ops = &ctrl_ops,
                .id = V4L2_CID_EXPOSURE_ABSOLUTE,
                .type = V4L2_CTRL_TYPE_INTEGER,
                .name = "exposure",
                .min = 0x0,
                .max = 0xffff,
                .step = 0x01,
                .def = 0x00,
                .flags = 0,
        },
        {
                .ops = &ctrl_ops,
                .id = V4L2_CID_FOCAL_ABSOLUTE,
                .type = V4L2_CTRL_TYPE_INTEGER,
                .name = "focal length",
                .min = OV5693_FOCAL_LENGTH_DEFAULT,
                .max = OV5693_FOCAL_LENGTH_DEFAULT,
                .step = 0x01,
                .def = OV5693_FOCAL_LENGTH_DEFAULT,
                .flags = 0,
        },
        {
                .ops = &ctrl_ops,
                .id = V4L2_CID_FNUMBER_ABSOLUTE,
                .type = V4L2_CTRL_TYPE_INTEGER,
                .name = "f-number",
                .min = OV5693_F_NUMBER_DEFAULT,
                .max = OV5693_F_NUMBER_DEFAULT,
                .step = 0x01,
                .def = OV5693_F_NUMBER_DEFAULT,
                .flags = 0,
        },
        {
                .ops = &ctrl_ops,
                .id = V4L2_CID_FNUMBER_RANGE,
                .type = V4L2_CTRL_TYPE_INTEGER,
                .name = "f-number range",
                .min = OV5693_F_NUMBER_RANGE,
                .max = OV5693_F_NUMBER_RANGE,
                .step = 0x01,
                .def = OV5693_F_NUMBER_RANGE,
                .flags = 0,
        },
        {
                .ops = &ctrl_ops,
                .id = V4L2_CID_FOCUS_ABSOLUTE,
                .type = V4L2_CTRL_TYPE_INTEGER,
                .name = "focus move absolute",
                .min = 0,
                .max = OV5693_VCM_MAX_FOCUS_POS,
                .step = 1,
                .def = 0,
                .flags = 0,
        },
        {
                .ops = &ctrl_ops,
                .id = V4L2_CID_FOCUS_RELATIVE,
                .type = V4L2_CTRL_TYPE_INTEGER,
                .name = "focus move relative",
                .min = OV5693_VCM_MAX_FOCUS_NEG,
                .max = OV5693_VCM_MAX_FOCUS_POS,
                .step = 1,
                .def = 0,
                .flags = 0,
        },
        {
                .ops = &ctrl_ops,
                .id = V4L2_CID_FOCUS_STATUS,
                .type = V4L2_CTRL_TYPE_INTEGER,
                .name = "focus status",
                .min = 0,
                .max = 100,             /* allow enum to grow in the future */
                .step = 1,
                .def = 0,
                .flags = 0,
        },
        {
                .ops = &ctrl_ops,
                .id = V4L2_CID_VCM_SLEW,
                .type = V4L2_CTRL_TYPE_INTEGER,
                .name = "vcm slew",
                .min = 0,
                .max = OV5693_VCM_SLEW_STEP_MAX,
                .step = 1,
                .def = 0,
                .flags = 0,
        },
        {
                .ops = &ctrl_ops,
                .id = V4L2_CID_VCM_TIMING,
                .type = V4L2_CTRL_TYPE_INTEGER,
                .name = "vcm step time",
                .min = 0,
                .max = OV5693_VCM_SLEW_TIME_MAX,
                .step = 1,
                .def = 0,
                .flags = 0,
        },
        {
                .ops = &ctrl_ops,
                .id = V4L2_CID_BIN_FACTOR_HORZ,
                .type = V4L2_CTRL_TYPE_INTEGER,
                .name = "horizontal binning factor",
                .min = 0,
                .max = OV5693_BIN_FACTOR_MAX,
                .step = 1,
                .def = 0,
                .flags = 0,
        },
        {
                .ops = &ctrl_ops,
                .id = V4L2_CID_BIN_FACTOR_VERT,
                .type = V4L2_CTRL_TYPE_INTEGER,
                .name = "vertical binning factor",
                .min = 0,
                .max = OV5693_BIN_FACTOR_MAX,
                .step = 1,
                .def = 0,
                .flags = 0,
        },
};

static int ov5693_init(struct v4l2_subdev *sd)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret;

        pr_info("%s\n", __func__);
        mutex_lock(&dev->input_lock);
        dev->vcm_update = false;

        if (dev->vcm == VCM_AD5823) {
                ret = vcm_ad_i2c_wr8(client, 0x01, 0x01); /* vcm init test */
                if (ret)
                        dev_err(&client->dev,
                                "vcm reset failed\n");
                /*change the mode*/
                ret = ad5823_i2c_write(client, AD5823_REG_VCM_CODE_MSB,
                                       AD5823_RING_CTRL_ENABLE);
                if (ret)
                        dev_err(&client->dev,
                                "vcm enable ringing failed\n");
                ret = ad5823_i2c_write(client, AD5823_REG_MODE,
                                       AD5823_ARC_RES1);
                if (ret)
                        dev_err(&client->dev,
                                "vcm change mode failed\n");
        }

        /*change initial focus value for ad5823*/
        if (dev->vcm == VCM_AD5823) {
                dev->focus = AD5823_INIT_FOCUS_POS;
                ov5693_t_focus_abs(sd, AD5823_INIT_FOCUS_POS);
        } else {
                dev->focus = 0;
                ov5693_t_focus_abs(sd, 0);
        }

        mutex_unlock(&dev->input_lock);

        return 0;
}

static int power_ctrl(struct v4l2_subdev *sd, bool flag)
{
        int ret;
        struct ov5693_device *dev = to_ov5693_sensor(sd);

        if (!dev || !dev->platform_data)
                return -ENODEV;

        /*
         * This driver assumes "internal DVDD, PWDNB tied to DOVDD".
         * In this set up only gpio0 (XSHUTDN) should be available
         * but in some products (for example ECS) gpio1 (PWDNB) is
         * also available. If gpio1 is available we emulate it being
         * tied to DOVDD here.
         */
        if (flag) {
                ret = dev->platform_data->v2p8_ctrl(sd, 1);
                dev->platform_data->gpio1_ctrl(sd, 1);
                if (ret == 0) {
                        ret = dev->platform_data->v1p8_ctrl(sd, 1);
                        if (ret) {
                                dev->platform_data->gpio1_ctrl(sd, 0);
                                ret = dev->platform_data->v2p8_ctrl(sd, 0);
                        }
                }
        } else {
                dev->platform_data->gpio1_ctrl(sd, 0);
                ret = dev->platform_data->v1p8_ctrl(sd, 0);
                ret |= dev->platform_data->v2p8_ctrl(sd, 0);
        }

        return ret;
}

static int gpio_ctrl(struct v4l2_subdev *sd, bool flag)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);

        if (!dev || !dev->platform_data)
                return -ENODEV;

        return dev->platform_data->gpio0_ctrl(sd, flag);
}

static int __power_up(struct v4l2_subdev *sd)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret;

        if (!dev->platform_data) {
                dev_err(&client->dev,
                        "no camera_sensor_platform_data");
                return -ENODEV;
        }

        /* power control */
        ret = power_ctrl(sd, 1);
        if (ret)
                goto fail_power;

        /* according to DS, at least 5ms is needed between DOVDD and PWDN */
        /* add this delay time to 10~11ms*/
        usleep_range(10000, 11000);

        /* gpio ctrl */
        ret = gpio_ctrl(sd, 1);
        if (ret) {
                ret = gpio_ctrl(sd, 1);
                if (ret)
                        goto fail_power;
        }

        /* flis clock control */
        ret = dev->platform_data->flisclk_ctrl(sd, 1);
        if (ret)
                goto fail_clk;

        __cci_delay(up_delay);

        return 0;

fail_clk:
        gpio_ctrl(sd, 0);
fail_power:
        power_ctrl(sd, 0);
        dev_err(&client->dev, "sensor power-up failed\n");

        return ret;
}

static int power_down(struct v4l2_subdev *sd)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret = 0;

        dev->focus = OV5693_INVALID_CONFIG;
        if (!dev->platform_data) {
                dev_err(&client->dev,
                        "no camera_sensor_platform_data");
                return -ENODEV;
        }

        ret = dev->platform_data->flisclk_ctrl(sd, 0);
        if (ret)
                dev_err(&client->dev, "flisclk failed\n");

        /* gpio ctrl */
        ret = gpio_ctrl(sd, 0);
        if (ret) {
                ret = gpio_ctrl(sd, 0);
                if (ret)
                        dev_err(&client->dev, "gpio failed 2\n");
        }

        /* power control */
        ret = power_ctrl(sd, 0);
        if (ret)
                dev_err(&client->dev, "vprog failed.\n");

        return ret;
}

static int power_up(struct v4l2_subdev *sd)
{
        static const int retry_count = 4;
        int i, ret;

        for (i = 0; i < retry_count; i++) {
                ret = __power_up(sd);
                if (!ret)
                        return 0;

                power_down(sd);
        }
        return ret;
}

static int ov5693_s_power(struct v4l2_subdev *sd, int on)
{
        int ret;

        pr_info("%s: on %d\n", __func__, on);
        if (on == 0)
                return power_down(sd);
        else {
                ret = power_up(sd);
                if (!ret) {
                        ret = ov5693_init(sd);
                        /* restore settings */
                        ov5693_res = ov5693_res_preview;
                        N_RES = N_RES_PREVIEW;
                }
        }
        return ret;
}

/*
 * distance - calculate the distance
 * @res: resolution
 * @w: width
 * @h: height
 *
 * Get the gap between res_w/res_h and w/h.
 * distance = (res_w/res_h - w/h) / (w/h) * 8192
 * res->width/height smaller than w/h wouldn't be considered.
 * The gap of ratio larger than 1/8 wouldn't be considered.
 * Returns the value of gap or -1 if fail.
 */
#define LARGEST_ALLOWED_RATIO_MISMATCH 1024
static int distance(struct ov5693_resolution *res, u32 w, u32 h)
{
        int ratio;
        int distance;

        if (w == 0 || h == 0 ||
            res->width < w || res->height < h)
                return -1;

        ratio = res->width << 13;
        ratio /= w;
        ratio *= h;
        ratio /= res->height;

        distance = abs(ratio - 8192);

        if (distance > LARGEST_ALLOWED_RATIO_MISMATCH)
                return -1;

        return distance;
}

/* Return the nearest higher resolution index
 * Firstly try to find the approximate aspect ratio resolution
 * If we find multiple same AR resolutions, choose the
 * minimal size.
 */
static int nearest_resolution_index(int w, int h)
{
        int i;
        int idx = -1;
        int dist;
        int min_dist = INT_MAX;
        int min_res_w = INT_MAX;
        struct ov5693_resolution *tmp_res = NULL;

        for (i = 0; i < N_RES; i++) {
                tmp_res = &ov5693_res[i];
                dist = distance(tmp_res, w, h);
                if (dist == -1)
                        continue;
                if (dist < min_dist) {
                        min_dist = dist;
                        idx = i;
                        min_res_w = ov5693_res[i].width;
                        continue;
                }
                if (dist == min_dist && ov5693_res[i].width < min_res_w)
                        idx = i;
        }

        return idx;
}

static int get_resolution_index(int w, int h)
{
        int i;

        for (i = 0; i < N_RES; i++) {
                if (w != ov5693_res[i].width)
                        continue;
                if (h != ov5693_res[i].height)
                        continue;

                return i;
        }

        return -1;
}

/* TODO: remove it. */
static int startup(struct v4l2_subdev *sd)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret = 0;

        ret = ov5693_write_reg(client, OV5693_8BIT,
                               OV5693_SW_RESET, 0x01);
        if (ret) {
                dev_err(&client->dev, "ov5693 reset err.\n");
                return ret;
        }

        ret = ov5693_write_reg_array(client, ov5693_global_setting);
        if (ret) {
                dev_err(&client->dev, "ov5693 write register err.\n");
                return ret;
        }

        ret = ov5693_write_reg_array(client, ov5693_res[dev->fmt_idx].regs);
        if (ret) {
                dev_err(&client->dev, "ov5693 write register err.\n");
                return ret;
        }

        return ret;
}

static int ov5693_set_fmt(struct v4l2_subdev *sd,
                          struct v4l2_subdev_state *sd_state,
                          struct v4l2_subdev_format *format)
{
        struct v4l2_mbus_framefmt *fmt = &format->format;
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct camera_mipi_info *ov5693_info = NULL;
        int ret = 0;
        int idx;

        if (format->pad)
                return -EINVAL;
        if (!fmt)
                return -EINVAL;
        ov5693_info = v4l2_get_subdev_hostdata(sd);
        if (!ov5693_info)
                return -EINVAL;

        mutex_lock(&dev->input_lock);
        idx = nearest_resolution_index(fmt->width, fmt->height);
        if (idx == -1) {
                /* return the largest resolution */
                fmt->width = ov5693_res[N_RES - 1].width;
                fmt->height = ov5693_res[N_RES - 1].height;
        } else {
                fmt->width = ov5693_res[idx].width;
                fmt->height = ov5693_res[idx].height;
        }

        fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
        if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
                sd_state->pads->try_fmt = *fmt;
                mutex_unlock(&dev->input_lock);
                return 0;
        }

        dev->fmt_idx = get_resolution_index(fmt->width, fmt->height);
        if (dev->fmt_idx == -1) {
                dev_err(&client->dev, "get resolution fail\n");
                mutex_unlock(&dev->input_lock);
                return -EINVAL;
        }

        ret = startup(sd);
        if (ret) {
                int i = 0;

                dev_err(&client->dev, "ov5693 startup err, retry to power up\n");
                for (i = 0; i < OV5693_POWER_UP_RETRY_NUM; i++) {
                        dev_err(&client->dev,
                                "ov5693 retry to power up %d/%d times, result: ",
                                i + 1, OV5693_POWER_UP_RETRY_NUM);
                        power_down(sd);
                        ret = power_up(sd);
                        if (!ret) {
                                mutex_unlock(&dev->input_lock);
                                ov5693_init(sd);
                                mutex_lock(&dev->input_lock);
                        } else {
                                dev_err(&client->dev, "power up failed, continue\n");
                                continue;
                        }
                        ret = startup(sd);
                        if (ret) {
                                dev_err(&client->dev, " startup FAILED!\n");
                        } else {
                                dev_err(&client->dev, " startup SUCCESS!\n");
                                break;
                        }
                }
        }

        /*
         * After sensor settings are set to HW, sometimes stream is started.
         * This would cause ISP timeout because ISP is not ready to receive
         * data yet. So add stop streaming here.
         */
        ret = ov5693_write_reg(client, OV5693_8BIT, OV5693_SW_STREAM,
                               OV5693_STOP_STREAMING);
        if (ret)
                dev_warn(&client->dev, "ov5693 stream off err\n");

        ret = ov5693_get_intg_factor(client, ov5693_info,
                                     &ov5693_res[dev->fmt_idx]);
        if (ret) {
                dev_err(&client->dev, "failed to get integration_factor\n");
                goto err;
        }

        ov5693_info->metadata_width = fmt->width * 10 / 8;
        ov5693_info->metadata_height = 1;
        ov5693_info->metadata_effective_width = &ov5693_embedded_effective_size;

err:
        mutex_unlock(&dev->input_lock);
        return ret;
}

static int ov5693_get_fmt(struct v4l2_subdev *sd,
                          struct v4l2_subdev_state *sd_state,
                          struct v4l2_subdev_format *format)
{
        struct v4l2_mbus_framefmt *fmt = &format->format;
        struct ov5693_device *dev = to_ov5693_sensor(sd);

        if (format->pad)
                return -EINVAL;

        if (!fmt)
                return -EINVAL;

        fmt->width = ov5693_res[dev->fmt_idx].width;
        fmt->height = ov5693_res[dev->fmt_idx].height;
        fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;

        return 0;
}

static int ov5693_detect(struct i2c_client *client)
{
        struct i2c_adapter *adapter = client->adapter;
        u16 high, low;
        int ret;
        u16 id;
        u8 revision;

        if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
                return -ENODEV;

        ret = ov5693_read_reg(client, OV5693_8BIT,
                              OV5693_SC_CMMN_CHIP_ID_H, &high);
        if (ret) {
                dev_err(&client->dev, "sensor_id_high = 0x%x\n", high);
                return -ENODEV;
        }
        ret = ov5693_read_reg(client, OV5693_8BIT,
                              OV5693_SC_CMMN_CHIP_ID_L, &low);
        id = ((((u16)high) << 8) | (u16)low);

        if (id != OV5693_ID) {
                dev_err(&client->dev, "sensor ID error 0x%x\n", id);
                return -ENODEV;
        }

        ret = ov5693_read_reg(client, OV5693_8BIT,
                              OV5693_SC_CMMN_SUB_ID, &high);
        revision = (u8)high & 0x0f;

        dev_dbg(&client->dev, "sensor_revision = 0x%x\n", revision);
        dev_dbg(&client->dev, "detect ov5693 success\n");
        return 0;
}

static int ov5693_s_stream(struct v4l2_subdev *sd, int enable)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret;

        mutex_lock(&dev->input_lock);

        ret = ov5693_write_reg(client, OV5693_8BIT, OV5693_SW_STREAM,
                               enable ? OV5693_START_STREAMING :
                               OV5693_STOP_STREAMING);

        mutex_unlock(&dev->input_lock);

        return ret;
}

static int ov5693_s_config(struct v4l2_subdev *sd,
                           int irq, void *platform_data)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret = 0;

        if (!platform_data)
                return -ENODEV;

        dev->platform_data =
            (struct camera_sensor_platform_data *)platform_data;

        mutex_lock(&dev->input_lock);
        /* power off the module, then power on it in future
         * as first power on by board may not fulfill the
         * power on sequqence needed by the module
         */
        ret = power_down(sd);
        if (ret) {
                dev_err(&client->dev, "ov5693 power-off err.\n");
                goto fail_power_off;
        }

        ret = power_up(sd);
        if (ret) {
                dev_err(&client->dev, "ov5693 power-up err.\n");
                goto fail_power_on;
        }

        if (!dev->vcm)
                dev->vcm = vcm_detect(client);

        ret = dev->platform_data->csi_cfg(sd, 1);
        if (ret)
                goto fail_csi_cfg;

        /* config & detect sensor */
        ret = ov5693_detect(client);
        if (ret) {
                dev_err(&client->dev, "ov5693_detect err s_config.\n");
                goto fail_csi_cfg;
        }

        dev->otp_data = ov5693_otp_read(sd);

        /* turn off sensor, after probed */
        ret = power_down(sd);
        if (ret) {
                dev_err(&client->dev, "ov5693 power-off err.\n");
                goto fail_csi_cfg;
        }
        mutex_unlock(&dev->input_lock);

        return ret;

fail_csi_cfg:
        dev->platform_data->csi_cfg(sd, 0);
fail_power_on:
        power_down(sd);
        dev_err(&client->dev, "sensor power-gating failed\n");
fail_power_off:
        mutex_unlock(&dev->input_lock);
        return ret;
}

static int ov5693_g_frame_interval(struct v4l2_subdev *sd,
                                   struct v4l2_subdev_frame_interval *interval)
{
        struct ov5693_device *dev = to_ov5693_sensor(sd);

        interval->interval.numerator = 1;
        interval->interval.denominator = ov5693_res[dev->fmt_idx].fps;

        return 0;
}

static int ov5693_enum_mbus_code(struct v4l2_subdev *sd,
                                 struct v4l2_subdev_state *sd_state,
                                 struct v4l2_subdev_mbus_code_enum *code)
{
        if (code->index >= MAX_FMTS)
                return -EINVAL;

        code->code = MEDIA_BUS_FMT_SBGGR10_1X10;
        return 0;
}

static int ov5693_enum_frame_size(struct v4l2_subdev *sd,
                                  struct v4l2_subdev_state *sd_state,
                                  struct v4l2_subdev_frame_size_enum *fse)
{
        int index = fse->index;

        if (index >= N_RES)
                return -EINVAL;

        fse->min_width = ov5693_res[index].width;
        fse->min_height = ov5693_res[index].height;
        fse->max_width = ov5693_res[index].width;
        fse->max_height = ov5693_res[index].height;

        return 0;
}

static const struct v4l2_subdev_video_ops ov5693_video_ops = {
        .s_stream = ov5693_s_stream,
        .g_frame_interval = ov5693_g_frame_interval,
};

static const struct v4l2_subdev_core_ops ov5693_core_ops = {
        .s_power = ov5693_s_power,
        .ioctl = ov5693_ioctl,
};

static const struct v4l2_subdev_pad_ops ov5693_pad_ops = {
        .enum_mbus_code = ov5693_enum_mbus_code,
        .enum_frame_size = ov5693_enum_frame_size,
        .get_fmt = ov5693_get_fmt,
        .set_fmt = ov5693_set_fmt,
};

static const struct v4l2_subdev_ops ov5693_ops = {
        .core = &ov5693_core_ops,
        .video = &ov5693_video_ops,
        .pad = &ov5693_pad_ops,
};

static int ov5693_remove(struct i2c_client *client)
{
        struct v4l2_subdev *sd = i2c_get_clientdata(client);
        struct ov5693_device *dev = to_ov5693_sensor(sd);

        dev_dbg(&client->dev, "ov5693_remove...\n");

        dev->platform_data->csi_cfg(sd, 0);

        v4l2_device_unregister_subdev(sd);

        atomisp_gmin_remove_subdev(sd);

        media_entity_cleanup(&dev->sd.entity);
        v4l2_ctrl_handler_free(&dev->ctrl_handler);
        kfree(dev);

        return 0;
}

static int ov5693_probe(struct i2c_client *client)
{
        struct ov5693_device *dev;
        int i2c;
        int ret;
        void *pdata;
        unsigned int i;

        /*
         * Firmware workaround: Some modules use a "secondary default"
         * address of 0x10 which doesn't appear on schematics, and
         * some BIOS versions haven't gotten the memo.  Work around
         * via config.
         */
        i2c = gmin_get_var_int(&client->dev, false, "I2CAddr", -1);
        if (i2c != -1) {
                dev_info(&client->dev,
                         "Overriding firmware-provided I2C address (0x%x) with 0x%x\n",
                         client->addr, i2c);
                client->addr = i2c;
        }

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

        mutex_init(&dev->input_lock);

        dev->fmt_idx = 0;
        v4l2_i2c_subdev_init(&dev->sd, client, &ov5693_ops);

        pdata = gmin_camera_platform_data(&dev->sd,
                                          ATOMISP_INPUT_FORMAT_RAW_10,
                                          atomisp_bayer_order_bggr);
        if (!pdata) {
                ret = -EINVAL;
                goto out_free;
        }

        ret = ov5693_s_config(&dev->sd, client->irq, pdata);
        if (ret)
                goto out_free;

        ret = atomisp_register_i2c_module(&dev->sd, pdata, RAW_CAMERA);
        if (ret)
                goto out_free;

        dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
        dev->pad.flags = MEDIA_PAD_FL_SOURCE;
        dev->format.code = MEDIA_BUS_FMT_SBGGR10_1X10;
        dev->sd.entity.function = MEDIA_ENT_F_CAM_SENSOR;
        ret =
            v4l2_ctrl_handler_init(&dev->ctrl_handler,
                                   ARRAY_SIZE(ov5693_controls));
        if (ret) {
                ov5693_remove(client);
                return ret;
        }

        for (i = 0; i < ARRAY_SIZE(ov5693_controls); i++)
                v4l2_ctrl_new_custom(&dev->ctrl_handler, &ov5693_controls[i],
                                     NULL);

        if (dev->ctrl_handler.error) {
                ov5693_remove(client);
                return dev->ctrl_handler.error;
        }

        /* Use same lock for controls as for everything else. */
        dev->ctrl_handler.lock = &dev->input_lock;
        dev->sd.ctrl_handler = &dev->ctrl_handler;

        ret = media_entity_pads_init(&dev->sd.entity, 1, &dev->pad);
        if (ret)
                ov5693_remove(client);

        return ret;
out_free:
        v4l2_device_unregister_subdev(&dev->sd);
        kfree(dev);
        return ret;
}

static const struct acpi_device_id ov5693_acpi_match[] = {
        {"INT33BE"},
        {},
};
MODULE_DEVICE_TABLE(acpi, ov5693_acpi_match);

static struct i2c_driver ov5693_driver = {
        .driver = {
                .name = "ov5693",
                .acpi_match_table = ov5693_acpi_match,
        },
        .probe_new = ov5693_probe,
        .remove = ov5693_remove,
};
module_i2c_driver(ov5693_driver);

MODULE_DESCRIPTION("A low-level driver for OmniVision 5693 sensors");
MODULE_LICENSE("GPL");