[mirror_ubuntu-bionic-kernel.git] / drivers / staging / media / atomisp / i2c / atomisp-ov2680.c

/*
 * Support for OmniVision OV2680 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/gpio.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 "ov2680.h"

static int h_flag = 0;
static int v_flag = 0;
static enum atomisp_bayer_order ov2680_bayer_order_mapping[] = {
        atomisp_bayer_order_bggr,
        atomisp_bayer_order_grbg,
        atomisp_bayer_order_gbrg,
        atomisp_bayer_order_rggb,
};

/* i2c read/write stuff */
static int ov2680_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 != OV2680_8BIT && data_length != OV2680_16BIT
                                        && data_length != OV2680_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 == OV2680_8BIT)
                *val = (u8)data[0];
        else if (data_length == OV2680_16BIT)
                *val = be16_to_cpu(*(u16 *)&data[0]);
        else
                *val = be32_to_cpu(*(u32 *)&data[0]);
        //dev_dbg(&client->dev,  "++++i2c read adr%x = %x\n", reg,*val);
        return 0;
}

static int ov2680_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);
        //dev_dbg(&client->dev,  "+++i2c write reg=%x->%x\n", data[0]*256 +data[1],data[2]);
        return ret == num_msg ? 0 : -EIO;
}

static int ov2680_write_reg(struct i2c_client *client, u16 data_length,
                                                        u16 reg, u16 val)
{
        int ret;
        unsigned char data[4] = {0};
        u16 *wreg = (u16 *)data;
        const u16 len = data_length + sizeof(u16); /* 16-bit address + data */

        if (data_length != OV2680_8BIT && data_length != OV2680_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 == OV2680_8BIT) {
                data[2] = (u8)(val);
        } else {
                /* OV2680_16BIT */
                u16 *wdata = (u16 *)&data[2];
                *wdata = cpu_to_be16(val);
        }

        ret = ov2680_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;
}

/*
 * ov2680_write_reg_array - Initializes a list of OV2680 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().
 *
 * __ov2680_flush_reg_array, __ov2680_buf_reg_array() and
 * __ov2680_write_reg_is_consecutive() are internal functions to
 * ov2680_write_reg_array_fast() and should be not used anywhere else.
 *
 */

static int __ov2680_flush_reg_array(struct i2c_client *client,
                                    struct ov2680_write_ctrl *ctrl)
{
        u16 size;

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

        size = sizeof(u16) + ctrl->index; /* 16-bit address + data */
        ctrl->buffer.addr = cpu_to_be16(ctrl->buffer.addr);
        ctrl->index = 0;

        return ov2680_i2c_write(client, size, (u8 *)&ctrl->buffer);
}

static int __ov2680_buf_reg_array(struct i2c_client *client,
                                  struct ov2680_write_ctrl *ctrl,
                                  const struct ov2680_reg *next)
{
        int size;
        u16 *data16;

        switch (next->type) {
        case OV2680_8BIT:
                size = 1;
                ctrl->buffer.data[ctrl->index] = (u8)next->val;
                break;
        case OV2680_16BIT:
                size = 2;
                data16 = (u16 *)&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) >= OV2680_MAX_WRITE_BUF_SIZE)
                return __ov2680_flush_reg_array(client, ctrl);

        return 0;
}

static int __ov2680_write_reg_is_consecutive(struct i2c_client *client,
                                             struct ov2680_write_ctrl *ctrl,
                                             const struct ov2680_reg *next)
{
        if (ctrl->index == 0)
                return 1;

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

static int ov2680_write_reg_array(struct i2c_client *client,
                                  const struct ov2680_reg *reglist)
{
        const struct ov2680_reg *next = reglist;
        struct ov2680_write_ctrl ctrl;
        int err;
        dev_dbg(&client->dev,  "++++write reg array\n");
        ctrl.index = 0;
        for (; next->type != OV2680_TOK_TERM; next++) {
                switch (next->type & OV2680_TOK_MASK) {
                case OV2680_TOK_DELAY:
                        err = __ov2680_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.
                         */
                         dev_dbg(&client->dev,  "+++ov2680_write_reg_array reg=%x->%x\n", next->reg,next->val);
                        if (!__ov2680_write_reg_is_consecutive(client, &ctrl,
                                                                next)) {
                                err = __ov2680_flush_reg_array(client, &ctrl);
                        if (err)
                                return err;
                        }
                        err = __ov2680_buf_reg_array(client, &ctrl, next);
                        if (err) {
                                dev_err(&client->dev, "%s: write error, aborted\n",
                                         __func__);
                                return err;
                        }
                        break;
                }
        }

        return __ov2680_flush_reg_array(client, &ctrl);
}
static int ov2680_g_focal(struct v4l2_subdev *sd, s32 *val)
{

        *val = (OV2680_FOCAL_LENGTH_NUM << 16) | OV2680_FOCAL_LENGTH_DEM;
        return 0;
}

static int ov2680_g_fnumber(struct v4l2_subdev *sd, s32 *val)
{
        /*const f number for ov2680*/

        *val = (OV2680_F_NUMBER_DEFAULT_NUM << 16) | OV2680_F_NUMBER_DEM;
        return 0;
}

static int ov2680_g_fnumber_range(struct v4l2_subdev *sd, s32 *val)
{
        *val = (OV2680_F_NUMBER_DEFAULT_NUM << 24) |
                (OV2680_F_NUMBER_DEM << 16) |
                (OV2680_F_NUMBER_DEFAULT_NUM << 8) | OV2680_F_NUMBER_DEM;
        return 0;
}

static int ov2680_g_bin_factor_x(struct v4l2_subdev *sd, s32 *val)
{
        struct ov2680_device *dev = to_ov2680_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        dev_dbg(&client->dev,  "++++ov2680_g_bin_factor_x\n");
        *val = ov2680_res[dev->fmt_idx].bin_factor_x;

        return 0;
}

static int ov2680_g_bin_factor_y(struct v4l2_subdev *sd, s32 *val)
{
        struct ov2680_device *dev = to_ov2680_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);

        *val = ov2680_res[dev->fmt_idx].bin_factor_y;
        dev_dbg(&client->dev,  "++++ov2680_g_bin_factor_y\n");
        return 0;
}


static int ov2680_get_intg_factor(struct i2c_client *client,
                                struct camera_mipi_info *info,
                                const struct ov2680_resolution *res)
{
        struct v4l2_subdev *sd = i2c_get_clientdata(client);
        struct ov2680_device *dev = to_ov2680_sensor(sd);
        struct atomisp_sensor_mode_data *buf = &info->data;
        unsigned int pix_clk_freq_hz;
        u16 reg_val;
        int ret;
        dev_dbg(&client->dev,  "++++ov2680_get_intg_factor\n");
        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 = OV2680_COARSE_INTG_TIME_MIN;
        buf->coarse_integration_time_max_margin =
                                        OV2680_COARSE_INTG_TIME_MAX_MARGIN;

        buf->fine_integration_time_min = OV2680_FINE_INTG_TIME_MIN;
        buf->fine_integration_time_max_margin =
                                        OV2680_FINE_INTG_TIME_MAX_MARGIN;

        buf->fine_integration_time_def = OV2680_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 =  ov2680_read_reg(client, OV2680_16BIT,
                                        OV2680_HORIZONTAL_START_H, &reg_val);
        if (ret)
                return ret;
        buf->crop_horizontal_start = reg_val;

        ret =  ov2680_read_reg(client, OV2680_16BIT,
                                        OV2680_VERTICAL_START_H, &reg_val);
        if (ret)
                return ret;
        buf->crop_vertical_start = reg_val;

        ret = ov2680_read_reg(client, OV2680_16BIT,
                                        OV2680_HORIZONTAL_END_H, &reg_val);
        if (ret)
                return ret;
        buf->crop_horizontal_end = reg_val;

        ret = ov2680_read_reg(client, OV2680_16BIT,
                                        OV2680_VERTICAL_END_H, &reg_val);
        if (ret)
                return ret;
        buf->crop_vertical_end = reg_val;

        ret = ov2680_read_reg(client, OV2680_16BIT,
                                        OV2680_HORIZONTAL_OUTPUT_SIZE_H, &reg_val);
        if (ret)
                return ret;
        buf->output_width = reg_val;

        ret = ov2680_read_reg(client, OV2680_16BIT,
                                        OV2680_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 * 2) : 1;
        buf->binning_factor_y = res->bin_factor_y ?
                                        (res->bin_factor_y * 2) : 1;
        return 0;
}

static long __ov2680_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
                                 int gain, int digitgain)

{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct ov2680_device *dev = to_ov2680_sensor(sd);
        u16 vts,hts;
        int ret,exp_val;

       dev_dbg(&client->dev, "+++++++__ov2680_set_exposure coarse_itg %d, gain %d, digitgain %d++\n",coarse_itg, gain, digitgain);

        hts = ov2680_res[dev->fmt_idx].pixels_per_line;
        vts = ov2680_res[dev->fmt_idx].lines_per_frame;

        /* group hold */
        ret = ov2680_write_reg(client, OV2680_8BIT,
                                       OV2680_GROUP_ACCESS, 0x00);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV2680_GROUP_ACCESS);
                return ret;
        }

        /* Increase the VTS to match exposure + MARGIN */
        if (coarse_itg > vts - OV2680_INTEGRATION_TIME_MARGIN)
                vts = (u16) coarse_itg + OV2680_INTEGRATION_TIME_MARGIN;

        ret = ov2680_write_reg(client, OV2680_16BIT, OV2680_TIMING_VTS_H, vts);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV2680_TIMING_VTS_H);
                return ret;
        }

        /* set exposure */

        /* Lower four bit should be 0*/
        exp_val = coarse_itg << 4;
        ret = ov2680_write_reg(client, OV2680_8BIT,
                               OV2680_EXPOSURE_L, exp_val & 0xFF);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV2680_EXPOSURE_L);
                return ret;
        }

        ret = ov2680_write_reg(client, OV2680_8BIT,
                               OV2680_EXPOSURE_M, (exp_val >> 8) & 0xFF);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV2680_EXPOSURE_M);
                return ret;
        }

        ret = ov2680_write_reg(client, OV2680_8BIT,
                               OV2680_EXPOSURE_H, (exp_val >> 16) & 0x0F);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV2680_EXPOSURE_H);
                return ret;
        }

        /* Analog gain */
        ret = ov2680_write_reg(client, OV2680_16BIT, OV2680_AGC_H, gain);
        if (ret) {
                dev_err(&client->dev, "%s: write %x error, aborted\n",
                        __func__, OV2680_AGC_H);
                return ret;
        }
        /* Digital gain */
        if (digitgain) {
                ret = ov2680_write_reg(client, OV2680_16BIT,
                                OV2680_MWB_RED_GAIN_H, digitgain);
                if (ret) {
                        dev_err(&client->dev, "%s: write %x error, aborted\n",
                                __func__, OV2680_MWB_RED_GAIN_H);
                        return ret;
                }

                ret = ov2680_write_reg(client, OV2680_16BIT,
                                OV2680_MWB_GREEN_GAIN_H, digitgain);
                if (ret) {
                        dev_err(&client->dev, "%s: write %x error, aborted\n",
                                __func__, OV2680_MWB_RED_GAIN_H);
                        return ret;
                }

                ret = ov2680_write_reg(client, OV2680_16BIT,
                                OV2680_MWB_BLUE_GAIN_H, digitgain);
                if (ret) {
                        dev_err(&client->dev, "%s: write %x error, aborted\n",
                                __func__, OV2680_MWB_RED_GAIN_H);
                        return ret;
                }
        }

        /* End group */
        ret = ov2680_write_reg(client, OV2680_8BIT,
                               OV2680_GROUP_ACCESS, 0x10);
        if (ret)
                return ret;

        /* Delay launch group */
        ret = ov2680_write_reg(client, OV2680_8BIT,
                                           OV2680_GROUP_ACCESS, 0xa0);
        if (ret)
                return ret;
        return ret;
}

static int ov2680_set_exposure(struct v4l2_subdev *sd, int exposure,
        int gain, int digitgain)
{
        struct ov2680_device *dev = to_ov2680_sensor(sd);
        int ret;

        mutex_lock(&dev->input_lock);
        ret = __ov2680_set_exposure(sd, exposure, gain, digitgain);
        mutex_unlock(&dev->input_lock);

        return ret;
}

static long ov2680_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;
        }

        // EXPOSURE CONTROL DISABLED FOR INITIAL CHECKIN, TUNING DOESN'T WORK
        return ov2680_set_exposure(sd, coarse_itg, analog_gain, digital_gain);
}





static long ov2680_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
{

        switch (cmd) {
        case ATOMISP_IOC_S_EXPOSURE:
                return ov2680_s_exposure(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 ov2680_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 = ov2680_read_reg(client, OV2680_8BIT,
                                        OV2680_EXPOSURE_L,
                                        &reg_v);
        if (ret)
                goto err;

        ret = ov2680_read_reg(client, OV2680_8BIT,
                                        OV2680_EXPOSURE_M,
                                        &reg_v2);
        if (ret)
                goto err;

        reg_v += reg_v2 << 8;
        ret = ov2680_read_reg(client, OV2680_8BIT,
                                        OV2680_EXPOSURE_H,
                                        &reg_v2);
        if (ret)
                goto err;

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

static u32 ov2680_translate_bayer_order(enum atomisp_bayer_order code)
{
        switch (code) {
        case atomisp_bayer_order_rggb:
                return MEDIA_BUS_FMT_SRGGB10_1X10;
        case atomisp_bayer_order_grbg:
                return MEDIA_BUS_FMT_SGRBG10_1X10;
        case atomisp_bayer_order_bggr:
                return MEDIA_BUS_FMT_SBGGR10_1X10;
        case atomisp_bayer_order_gbrg:
                return MEDIA_BUS_FMT_SGBRG10_1X10;
        }
        return 0;
}

static int ov2680_v_flip(struct v4l2_subdev *sd, s32 value)
{
        struct ov2680_device *dev = to_ov2680_sensor(sd);
        struct camera_mipi_info *ov2680_info = NULL;
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret;
        u16 val;
        u8 index;
        dev_dbg(&client->dev, "@%s: value:%d\n", __func__, value);
        ret = ov2680_read_reg(client, OV2680_8BIT, OV2680_FLIP_REG, &val);
        if (ret)
                return ret;
        if (value) {
                val |= OV2680_FLIP_MIRROR_BIT_ENABLE;
        } else {
                val &= ~OV2680_FLIP_MIRROR_BIT_ENABLE;
        }
        ret = ov2680_write_reg(client, OV2680_8BIT,
                        OV2680_FLIP_REG, val);
        if (ret)
                return ret;
        index = (v_flag>0?OV2680_FLIP_BIT:0) | (h_flag>0?OV2680_MIRROR_BIT:0);
        ov2680_info = v4l2_get_subdev_hostdata(sd);
        if (ov2680_info) {
                ov2680_info->raw_bayer_order = ov2680_bayer_order_mapping[index];
                dev->format.code = ov2680_translate_bayer_order(
                        ov2680_info->raw_bayer_order);
        }
        return ret;
}

static int ov2680_h_flip(struct v4l2_subdev *sd, s32 value)
{
        struct ov2680_device *dev = to_ov2680_sensor(sd);
        struct camera_mipi_info *ov2680_info = NULL;
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret;
        u16 val;
        u8 index;
        dev_dbg(&client->dev, "@%s: value:%d\n", __func__, value);

        ret = ov2680_read_reg(client, OV2680_8BIT, OV2680_MIRROR_REG, &val);
        if (ret)
                return ret;
        if (value) {
                val |= OV2680_FLIP_MIRROR_BIT_ENABLE;
        } else {
                val &= ~OV2680_FLIP_MIRROR_BIT_ENABLE;
        }
        ret = ov2680_write_reg(client, OV2680_8BIT,
                        OV2680_MIRROR_REG, val);
        if (ret)
                return ret;
        index = (v_flag>0?OV2680_FLIP_BIT:0) | (h_flag>0?OV2680_MIRROR_BIT:0);
        ov2680_info = v4l2_get_subdev_hostdata(sd);
        if (ov2680_info) {
                ov2680_info->raw_bayer_order = ov2680_bayer_order_mapping[index];
                dev->format.code = ov2680_translate_bayer_order(
                        ov2680_info->raw_bayer_order);
        }
        return ret;
}

static int ov2680_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct ov2680_device *dev =
            container_of(ctrl->handler, struct ov2680_device, ctrl_handler);
        struct i2c_client *client = v4l2_get_subdevdata(&dev->sd);
        int ret = 0;

        switch (ctrl->id) {
        case V4L2_CID_VFLIP:
                dev_dbg(&client->dev, "%s: CID_VFLIP:%d.\n",
                        __func__, ctrl->val);
                ret = ov2680_v_flip(&dev->sd, ctrl->val);
                break;
        case V4L2_CID_HFLIP:
                dev_dbg(&client->dev, "%s: CID_HFLIP:%d.\n",
                        __func__, ctrl->val);
                ret = ov2680_h_flip(&dev->sd, ctrl->val);
                break;
        default:
                ret = -EINVAL;
        }
        return ret;
}

static int ov2680_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
{
        struct ov2680_device *dev =
            container_of(ctrl->handler, struct ov2680_device, ctrl_handler);
        int ret = 0;

        switch (ctrl->id) {
        case V4L2_CID_EXPOSURE_ABSOLUTE:
                ret = ov2680_q_exposure(&dev->sd, &ctrl->val);
                break;
        case V4L2_CID_FOCAL_ABSOLUTE:
                ret = ov2680_g_focal(&dev->sd, &ctrl->val);
                break;
        case V4L2_CID_FNUMBER_ABSOLUTE:
                ret = ov2680_g_fnumber(&dev->sd, &ctrl->val);
                break;
        case V4L2_CID_FNUMBER_RANGE:
                ret = ov2680_g_fnumber_range(&dev->sd, &ctrl->val);
                break;
        case V4L2_CID_BIN_FACTOR_HORZ:
                ret = ov2680_g_bin_factor_x(&dev->sd, &ctrl->val);
                break;
        case V4L2_CID_BIN_FACTOR_VERT:
                ret = ov2680_g_bin_factor_y(&dev->sd, &ctrl->val);
                break;
        default:
                ret = -EINVAL;
        }

        return ret;
}

static const struct v4l2_ctrl_ops ctrl_ops = {
        .s_ctrl = ov2680_s_ctrl,
        .g_volatile_ctrl = ov2680_g_volatile_ctrl
};

struct v4l2_ctrl_config ov2680_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 = OV2680_FOCAL_LENGTH_DEFAULT,
         .max = OV2680_FOCAL_LENGTH_DEFAULT,
         .step = 0x01,
         .def = OV2680_FOCAL_LENGTH_DEFAULT,
         .flags = 0,
         },
        {
         .ops = &ctrl_ops,
         .id = V4L2_CID_FNUMBER_ABSOLUTE,
         .type = V4L2_CTRL_TYPE_INTEGER,
         .name = "f-number",
         .min = OV2680_F_NUMBER_DEFAULT,
         .max = OV2680_F_NUMBER_DEFAULT,
         .step = 0x01,
         .def = OV2680_F_NUMBER_DEFAULT,
         .flags = 0,
         },
        {
         .ops = &ctrl_ops,
         .id = V4L2_CID_FNUMBER_RANGE,
         .type = V4L2_CTRL_TYPE_INTEGER,
         .name = "f-number range",
         .min = OV2680_F_NUMBER_RANGE,
         .max = OV2680_F_NUMBER_RANGE,
         .step = 0x01,
         .def = OV2680_F_NUMBER_RANGE,
         .flags = 0,
         },
        {
         .ops = &ctrl_ops,
         .id = V4L2_CID_BIN_FACTOR_HORZ,
         .type = V4L2_CTRL_TYPE_INTEGER,
         .name = "horizontal binning factor",
         .min = 0,
         .max = OV2680_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 = OV2680_BIN_FACTOR_MAX,
         .step = 1,
         .def = 0,
         .flags = 0,
         },
        {
         .ops = &ctrl_ops,
         .id = V4L2_CID_VFLIP,
         .type = V4L2_CTRL_TYPE_BOOLEAN,
         .name = "Flip",
         .min = 0,
         .max = 1,
         .step = 1,
         .def = 0,
         },
        {
         .ops = &ctrl_ops,
         .id = V4L2_CID_HFLIP,
         .type = V4L2_CTRL_TYPE_BOOLEAN,
         .name = "Mirror",
         .min = 0,
         .max = 1,
         .step = 1,
         .def = 0,
         },
};

static int ov2680_init_registers(struct v4l2_subdev *sd)
{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret;

        ret = ov2680_write_reg(client, OV2680_8BIT, OV2680_SW_RESET, 0x01);
        ret |= ov2680_write_reg_array(client, ov2680_global_setting);

        return ret;
}

static int ov2680_init(struct v4l2_subdev *sd)
{
        struct ov2680_device *dev = to_ov2680_sensor(sd);

        int ret;

        mutex_lock(&dev->input_lock);

        /* restore settings */
        ov2680_res = ov2680_res_preview;
        N_RES = N_RES_PREVIEW;

        ret = ov2680_init_registers(sd);

        mutex_unlock(&dev->input_lock);

        return ret;
}

static int power_ctrl(struct v4l2_subdev *sd, bool flag)
{
        int ret = 0;
        struct ov2680_device *dev = to_ov2680_sensor(sd);
        if (!dev || !dev->platform_data)
                return -ENODEV;

        /* Non-gmin platforms use the legacy callback */
        if (dev->platform_data->power_ctrl)
                return dev->platform_data->power_ctrl(sd, flag);

        if (flag) {
                ret |= dev->platform_data->v1p8_ctrl(sd, 1);
                ret |= dev->platform_data->v2p8_ctrl(sd, 1);
                usleep_range(10000, 15000);
        }

        if (!flag || ret) {
                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)
{
        int ret;
        struct ov2680_device *dev = to_ov2680_sensor(sd);

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

        /* Non-gmin platforms use the legacy callback */
        if (dev->platform_data->gpio_ctrl)
                return dev->platform_data->gpio_ctrl(sd, flag);

        /* The OV2680 documents only one GPIO input (#XSHUTDN), but
         * existing integrations often wire two (reset/power_down)
         * because that is the way other sensors work.  There is no
         * way to tell how it is wired internally, so existing
         * firmwares expose both and we drive them symmetrically. */
        if (flag) {
                ret = dev->platform_data->gpio0_ctrl(sd, 1);
                usleep_range(10000, 15000);
                /* Ignore return from second gpio, it may not be there */
                dev->platform_data->gpio1_ctrl(sd, 1);
                usleep_range(10000, 15000);
        } else {
                dev->platform_data->gpio1_ctrl(sd, 0);
                ret = dev->platform_data->gpio0_ctrl(sd, 0);
        }
        return ret;
}

static int power_up(struct v4l2_subdev *sd)
{
        struct ov2680_device *dev = to_ov2680_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 */
        usleep_range(5000, 6000);

        /* 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;

        /* according to DS, 20ms is needed between PWDN and i2c access */
        msleep(20);

        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 ov2680_device *dev = to_ov2680_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret = 0;

        h_flag = 0;
        v_flag = 0;
        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 ov2680_s_power(struct v4l2_subdev *sd, int on)
{
        int ret;

        if (on == 0){
                ret = power_down(sd);
        } else {
                ret = power_up(sd);
                if (!ret)
                        return ov2680_init(sd);
        }
        return ret;
}

/*
 * distance - calculate the distance
 * @res: resolution
 * @w: width
 * @h: height
 *
 * Get the gap between resolution and w/h.
 * res->width/height smaller than w/h wouldn't be considered.
 * Returns the value of gap or -1 if fail.
 */
#define LARGEST_ALLOWED_RATIO_MISMATCH 600
static int distance(struct ov2680_resolution *res, u32 w, u32 h)
{
        unsigned int w_ratio = (res->width << 13) / w;
        unsigned int h_ratio;
        int match;

        if (h == 0)
                return -1;
        h_ratio = (res->height << 13) / h;
        if (h_ratio == 0)
                return -1;
        match   = abs(((w_ratio << 13) / h_ratio) - ((int)8192));


        if ((w_ratio < (int)8192) || (h_ratio < (int)8192)  ||
                (match > LARGEST_ALLOWED_RATIO_MISMATCH))
                return -1;

        return w_ratio + h_ratio;
}

/* Return the nearest higher resolution index */
static int nearest_resolution_index(int w, int h)
{
        int i;
        int idx = -1;
        int dist;
        int min_dist = INT_MAX;
        struct ov2680_resolution *tmp_res = NULL;

        for (i = 0; i < N_RES; i++) {
                tmp_res = &ov2680_res[i];
                dist = distance(tmp_res, w, h);
                if (dist == -1)
                        continue;
                if (dist < min_dist) {
                        min_dist = dist;
                        idx = i;
                }
        }

        return idx;
}

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

        for (i = 0; i < N_RES; i++) {
                if (w != ov2680_res[i].width)
                        continue;
                if (h != ov2680_res[i].height)
                        continue;

                return i;
        }

        return -1;
}

static int ov2680_set_fmt(struct v4l2_subdev *sd,
                          struct v4l2_subdev_pad_config *cfg,
                          struct v4l2_subdev_format *format)
{
        struct v4l2_mbus_framefmt *fmt = &format->format;
        struct ov2680_device *dev = to_ov2680_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct camera_mipi_info *ov2680_info = NULL;
        int ret = 0;
        int idx = 0;
        dev_dbg(&client->dev, "+++++ov2680_s_mbus_fmt+++++l\n");
        if (format->pad)
                return -EINVAL;

        if (!fmt)
                return -EINVAL;

        ov2680_info = v4l2_get_subdev_hostdata(sd);
        if (!ov2680_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 = ov2680_res[N_RES - 1].width;
                fmt->height = ov2680_res[N_RES - 1].height;
        } else {
                fmt->width = ov2680_res[idx].width;
                fmt->height = ov2680_res[idx].height;
        }
        fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;
        if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
                cfg->try_fmt = *fmt;
                mutex_unlock(&dev->input_lock);
                return 0;
                }
        dev->fmt_idx = get_resolution_index(fmt->width, fmt->height);
        dev_dbg(&client->dev, "+++++get_resolution_index=%d+++++l\n",
                     dev->fmt_idx);
        if (dev->fmt_idx == -1) {
                dev_err(&client->dev, "get resolution fail\n");
                mutex_unlock(&dev->input_lock);
                return -EINVAL;
        }
        v4l2_info(client, "__s_mbus_fmt i=%d, w=%d, h=%d\n", dev->fmt_idx,
                  fmt->width, fmt->height);
        dev_dbg(&client->dev, "__s_mbus_fmt i=%d, w=%d, h=%d\n",
                     dev->fmt_idx, fmt->width, fmt->height);

        ret = ov2680_write_reg_array(client, ov2680_res[dev->fmt_idx].regs);
        if (ret)
                dev_err(&client->dev, "ov2680 write resolution register err\n");

        ret = ov2680_get_intg_factor(client, ov2680_info,
                                     &ov2680_res[dev->fmt_idx]);
        if (ret) {
                dev_err(&client->dev, "failed to get integration_factor\n");
                goto err;
        }

        /*recall flip functions to avoid flip registers
         * were overridden by default setting
         */
        if (h_flag)
                ov2680_h_flip(sd, h_flag);
        if (v_flag)
                ov2680_v_flip(sd, v_flag);

        v4l2_info(client, "\n%s idx %d \n", __func__, dev->fmt_idx);

        /*ret = startup(sd);
         * if (ret)
         * dev_err(&client->dev, "ov2680 startup err\n");
         */
err:
        mutex_unlock(&dev->input_lock);
        return ret;
}

static int ov2680_get_fmt(struct v4l2_subdev *sd,
                          struct v4l2_subdev_pad_config *cfg,
                          struct v4l2_subdev_format *format)
{
        struct v4l2_mbus_framefmt *fmt = &format->format;
        struct ov2680_device *dev = to_ov2680_sensor(sd);

        if (format->pad)
                return -EINVAL;

        if (!fmt)
                return -EINVAL;

        fmt->width = ov2680_res[dev->fmt_idx].width;
        fmt->height = ov2680_res[dev->fmt_idx].height;
        fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;

        return 0;
}

static int ov2680_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 = ov2680_read_reg(client, OV2680_8BIT,
                                        OV2680_SC_CMMN_CHIP_ID_H, &high);
        if (ret) {
                dev_err(&client->dev, "sensor_id_high = 0x%x\n", high);
                return -ENODEV;
        }
        ret = ov2680_read_reg(client, OV2680_8BIT,
                                        OV2680_SC_CMMN_CHIP_ID_L, &low);
        id = ((((u16) high) << 8) | (u16) low);

        if (id != OV2680_ID) {
                dev_err(&client->dev, "sensor ID error 0x%x\n", id);
                return -ENODEV;
        }

        ret = ov2680_read_reg(client, OV2680_8BIT,
                                        OV2680_SC_CMMN_SUB_ID, &high);
        revision = (u8) high & 0x0f;

        dev_info(&client->dev, "sensor_revision id = 0x%x\n", id);

        return 0;
}

static int ov2680_s_stream(struct v4l2_subdev *sd, int enable)
{
        struct ov2680_device *dev = to_ov2680_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret;

        mutex_lock(&dev->input_lock);
        if(enable )
                dev_dbg(&client->dev, "ov2680_s_stream one \n");
        else
                dev_dbg(&client->dev, "ov2680_s_stream off \n");

        ret = ov2680_write_reg(client, OV2680_8BIT, OV2680_SW_STREAM,
                                enable ? OV2680_START_STREAMING :
                                OV2680_STOP_STREAMING);
#if 0
        /* restore settings */
        ov2680_res = ov2680_res_preview;
        N_RES = N_RES_PREVIEW;
#endif

        //otp valid at stream on state
        //if(!dev->otp_data)
        //      dev->otp_data = ov2680_otp_read(sd);

        mutex_unlock(&dev->input_lock);

        return ret;
}


static int ov2680_s_config(struct v4l2_subdev *sd,
                           int irq, void *platform_data)
{
        struct ov2680_device *dev = to_ov2680_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, "ov2680 power-off err.\n");
                goto fail_power_off;
        }

        ret = power_up(sd);
        if (ret) {
                dev_err(&client->dev, "ov2680 power-up err.\n");
                goto fail_power_on;
        }

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

        /* config & detect sensor */
        ret = ov2680_detect(client);
        if (ret) {
                dev_err(&client->dev, "ov2680_detect err s_config.\n");
                goto fail_csi_cfg;
        }

        /* turn off sensor, after probed */
        ret = power_down(sd);
        if (ret) {
                dev_err(&client->dev, "ov2680 power-off err.\n");
                goto fail_csi_cfg;
        }
        mutex_unlock(&dev->input_lock);

        return 0;

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 ov2680_g_parm(struct v4l2_subdev *sd,
                        struct v4l2_streamparm *param)
{
        struct ov2680_device *dev = to_ov2680_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);

        if (!param)
                return -EINVAL;

        if (param->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
                dev_err(&client->dev,  "unsupported buffer type.\n");
                return -EINVAL;
        }

        memset(param, 0, sizeof(*param));
        param->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

        if (dev->fmt_idx >= 0 && dev->fmt_idx < N_RES) {
                param->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
                param->parm.capture.timeperframe.numerator = 1;
                param->parm.capture.capturemode = dev->run_mode;
                param->parm.capture.timeperframe.denominator =
                        ov2680_res[dev->fmt_idx].fps;
        }
        return 0;
}

static int ov2680_s_parm(struct v4l2_subdev *sd,
                        struct v4l2_streamparm *param)
{
        struct ov2680_device *dev = to_ov2680_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        dev->run_mode = param->parm.capture.capturemode;

        v4l2_info(client, "\n%s:run_mode :%x\n", __func__, dev->run_mode);

        mutex_lock(&dev->input_lock);
        switch (dev->run_mode) {
        case CI_MODE_VIDEO:
                ov2680_res = ov2680_res_video;
                N_RES = N_RES_VIDEO;
                break;
        case CI_MODE_STILL_CAPTURE:
                ov2680_res = ov2680_res_still;
                N_RES = N_RES_STILL;
                break;
        default:
                ov2680_res = ov2680_res_preview;
                N_RES = N_RES_PREVIEW;
        }
        mutex_unlock(&dev->input_lock);
        return 0;
}

static int ov2680_g_frame_interval(struct v4l2_subdev *sd,
                                   struct v4l2_subdev_frame_interval *interval)
{
        struct ov2680_device *dev = to_ov2680_sensor(sd);

        interval->interval.numerator = 1;
        interval->interval.denominator = ov2680_res[dev->fmt_idx].fps;

        return 0;
}

static int ov2680_enum_mbus_code(struct v4l2_subdev *sd,
                                 struct v4l2_subdev_pad_config *cfg,
                                 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 ov2680_enum_frame_size(struct v4l2_subdev *sd,
                                  struct v4l2_subdev_pad_config *cfg,
                                  struct v4l2_subdev_frame_size_enum *fse)
{
        int index = fse->index;

        if (index >= N_RES)
                return -EINVAL;

        fse->min_width = ov2680_res[index].width;
        fse->min_height = ov2680_res[index].height;
        fse->max_width = ov2680_res[index].width;
        fse->max_height = ov2680_res[index].height;

        return 0;

}

static int ov2680_g_skip_frames(struct v4l2_subdev *sd, u32 *frames)
{
        struct ov2680_device *dev = to_ov2680_sensor(sd);

        mutex_lock(&dev->input_lock);
        *frames = ov2680_res[dev->fmt_idx].skip_frames;
        mutex_unlock(&dev->input_lock);

        return 0;
}

static const struct v4l2_subdev_video_ops ov2680_video_ops = {
        .s_stream = ov2680_s_stream,
        .g_parm = ov2680_g_parm,
        .s_parm = ov2680_s_parm,
        .g_frame_interval = ov2680_g_frame_interval,
};

static const struct v4l2_subdev_sensor_ops ov2680_sensor_ops = {
                .g_skip_frames  = ov2680_g_skip_frames,
};

static const struct v4l2_subdev_core_ops ov2680_core_ops = {
        .s_power = ov2680_s_power,
        .ioctl = ov2680_ioctl,
};

static const struct v4l2_subdev_pad_ops ov2680_pad_ops = {
        .enum_mbus_code = ov2680_enum_mbus_code,
        .enum_frame_size = ov2680_enum_frame_size,
        .get_fmt = ov2680_get_fmt,
        .set_fmt = ov2680_set_fmt,
};

static const struct v4l2_subdev_ops ov2680_ops = {
        .core = &ov2680_core_ops,
        .video = &ov2680_video_ops,
        .pad = &ov2680_pad_ops,
        .sensor = &ov2680_sensor_ops,
};

static int ov2680_remove(struct i2c_client *client)
{
        struct v4l2_subdev *sd = i2c_get_clientdata(client);
        struct ov2680_device *dev = to_ov2680_sensor(sd);
        dev_dbg(&client->dev, "ov2680_remove...\n");

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

        v4l2_device_unregister_subdev(sd);
        media_entity_cleanup(&dev->sd.entity);
        v4l2_ctrl_handler_free(&dev->ctrl_handler);
        kfree(dev);

        return 0;
}

static int ov2680_probe(struct i2c_client *client,
                        const struct i2c_device_id *id)
{
        struct ov2680_device *dev;
        int ret;
        void *pdata;
        unsigned int i;

        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, &ov2680_ops);

        if (ACPI_COMPANION(&client->dev))
                pdata = gmin_camera_platform_data(&dev->sd,
                                                  ATOMISP_INPUT_FORMAT_RAW_10,
                                                  atomisp_bayer_order_bggr);
        else
                pdata = client->dev.platform_data;

        if (!pdata) {
                ret = -EINVAL;
                goto out_free;
        }

        ret = ov2680_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(ov2680_controls));
        if (ret) {
                ov2680_remove(client);
                return ret;
        }

        for (i = 0; i < ARRAY_SIZE(ov2680_controls); i++)
                v4l2_ctrl_new_custom(&dev->ctrl_handler, &ov2680_controls[i],
                                     NULL);

        if (dev->ctrl_handler.error) {
                ov2680_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)
        {
                ov2680_remove(client);
                dev_dbg(&client->dev, "+++ remove ov2680 \n");
        }
        return ret;
out_free:
        dev_dbg(&client->dev, "+++ out free \n");
        v4l2_device_unregister_subdev(&dev->sd);
        kfree(dev);
        return ret;
}

static const struct acpi_device_id ov2680_acpi_match[] = {
        {"XXOV2680"},
        {"OVTI2680"},
        {},
};
MODULE_DEVICE_TABLE(acpi, ov2680_acpi_match);


MODULE_DEVICE_TABLE(i2c, ov2680_id);
static struct i2c_driver ov2680_driver = {
        .driver = {
                .owner = THIS_MODULE,
                .name = OV2680_NAME,
                .acpi_match_table = ACPI_PTR(ov2680_acpi_match),

        },
        .probe = ov2680_probe,
        .remove = ov2680_remove,
        .id_table = ov2680_id,
};

static int init_ov2680(void)
{
        return i2c_add_driver(&ov2680_driver);
}

static void exit_ov2680(void)
{

        i2c_del_driver(&ov2680_driver);
}

module_init(init_ov2680);
module_exit(exit_ov2680);

MODULE_AUTHOR("Jacky Wang <Jacky_wang@ovt.com>");
MODULE_DESCRIPTION("A low-level driver for OmniVision 2680 sensors");
MODULE_LICENSE("GPL");