// SPDX-License-Identifier: GPL-2.0
/*
 * Support for OmniVision OV2722 1080p HD camera sensor.
 *
 * Copyright (c) 2013 Intel Corporation. All Rights Reserved.
 */

#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 "../include/linux/atomisp_gmin_platform.h"
#include <linux/acpi.h>
#include <linux/io.h>

#include "ov2722.h"

/* i2c read/write stuff */
static int ov2722_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 != OV2722_8BIT && data_length != OV2722_16BIT &&
            data_length != OV2722_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 == OV2722_8BIT)
                *val = (u8)data[0];
        else if (data_length == OV2722_16BIT)
                *val = be16_to_cpu(*(__be16 *)&data[0]);
        else
                *val = be32_to_cpu(*(__be32 *)&data[0]);

        return 0;
}

static int ov2722_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 ov2722_write_reg(struct i2c_client *client, u16 data_length,
                            u16 reg, u16 val)
{
        int ret;
        unsigned char data[4] = {0};
        __be16 *wreg = (__be16 *)data;
        const u16 len = data_length + sizeof(u16); /* 16-bit address + data */

        if (data_length != OV2722_8BIT && data_length != OV2722_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 == OV2722_8BIT) {
                data[2] = (u8)(val);
        } else {
                /* OV2722_16BIT */
                __be16 *wdata = (__be16 *)&data[2];

                *wdata = cpu_to_be16(val);
        }

        ret = ov2722_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;
}

/*
 * ov2722_write_reg_array - Initializes a list of OV2722 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().
 *
 * __ov2722_flush_reg_array, __ov2722_buf_reg_array() and
 * __ov2722_write_reg_is_consecutive() are internal functions to
 * ov2722_write_reg_array_fast() and should be not used anywhere else.
 *
 */

static int __ov2722_flush_reg_array(struct i2c_client *client,
                                    struct ov2722_write_ctrl *ctrl)
{
        u16 size;
        __be16 *data16 = (void *)&ctrl->buffer.addr;

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

        size = sizeof(u16) + ctrl->index; /* 16-bit address + data */
        *data16 = cpu_to_be16(ctrl->buffer.addr);
        ctrl->index = 0;

        return ov2722_i2c_write(client, size, (u8 *)&ctrl->buffer);
}

static int __ov2722_buf_reg_array(struct i2c_client *client,
                                  struct ov2722_write_ctrl *ctrl,
                                  const struct ov2722_reg *next)
{
        int size;
        __be16 *data16;

        switch (next->type) {
        case OV2722_8BIT:
                size = 1;
                ctrl->buffer.data[ctrl->index] = (u8)next->val;
                break;
        case OV2722_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) >= OV2722_MAX_WRITE_BUF_SIZE)
                return __ov2722_flush_reg_array(client, ctrl);

        return 0;
}

static int __ov2722_write_reg_is_consecutive(struct i2c_client *client,
                                             struct ov2722_write_ctrl *ctrl,
                                             const struct ov2722_reg *next)
{
        if (ctrl->index == 0)
                return 1;

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

static int ov2722_write_reg_array(struct i2c_client *client,
                                  const struct ov2722_reg *reglist)
{
        const struct ov2722_reg *next = reglist;
        struct ov2722_write_ctrl ctrl;
        int err;

        ctrl.index = 0;
        for (; next->type != OV2722_TOK_TERM; next++) {
                switch (next->type & OV2722_TOK_MASK) {
                case OV2722_TOK_DELAY:
                        err = __ov2722_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 (!__ov2722_write_reg_is_consecutive(client, &ctrl,
                                                               next)) {
                                err = __ov2722_flush_reg_array(client, &ctrl);
                                if (err)
                                        return err;
                        }
                        err = __ov2722_buf_reg_array(client, &ctrl, next);
                        if (err) {
                                dev_err(&client->dev, "%s: write error, aborted\n",
                                        __func__);
                                return err;
                        }
                        break;
                }
        }

        return __ov2722_flush_reg_array(client, &ctrl);
}

static long __ov2722_set_exposure(struct v4l2_subdev *sd, int coarse_itg,
                                  int gain, int digitgain)

{
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct ov2722_device *dev = to_ov2722_sensor(sd);
        u16 hts, vts;
        int ret;

        dev_dbg(&client->dev, "set_exposure without group hold\n");

        /* clear VTS_DIFF on manual mode */
        ret = ov2722_write_reg(client, OV2722_16BIT, OV2722_VTS_DIFF_H, 0);
        if (ret)
                return ret;

        hts = dev->pixels_per_line;
        vts = dev->lines_per_frame;

        if ((coarse_itg + OV2722_COARSE_INTG_TIME_MAX_MARGIN) > vts)
                vts = coarse_itg + OV2722_COARSE_INTG_TIME_MAX_MARGIN;

        coarse_itg <<= 4;
        digitgain <<= 2;

        ret = ov2722_write_reg(client, OV2722_16BIT,
                               OV2722_VTS_H, vts);
        if (ret)
                return ret;

        ret = ov2722_write_reg(client, OV2722_16BIT,
                               OV2722_HTS_H, hts);
        if (ret)
                return ret;

        /* set exposure */
        ret = ov2722_write_reg(client, OV2722_8BIT,
                               OV2722_AEC_PK_EXPO_L,
                               coarse_itg & 0xff);
        if (ret)
                return ret;

        ret = ov2722_write_reg(client, OV2722_16BIT,
                               OV2722_AEC_PK_EXPO_H,
                               (coarse_itg >> 8) & 0xfff);
        if (ret)
                return ret;

        /* set analog gain */
        ret = ov2722_write_reg(client, OV2722_16BIT,
                               OV2722_AGC_ADJ_H, gain);
        if (ret)
                return ret;

        /* set digital gain */
        ret = ov2722_write_reg(client, OV2722_16BIT,
                               OV2722_MWB_GAIN_R_H, digitgain);
        if (ret)
                return ret;

        ret = ov2722_write_reg(client, OV2722_16BIT,
                               OV2722_MWB_GAIN_G_H, digitgain);
        if (ret)
                return ret;

        ret = ov2722_write_reg(client, OV2722_16BIT,
                               OV2722_MWB_GAIN_B_H, digitgain);

        return ret;
}

static int ov2722_set_exposure(struct v4l2_subdev *sd, int exposure,
                               int gain, int digitgain)
{
        struct ov2722_device *dev = to_ov2722_sensor(sd);
        int ret;

        mutex_lock(&dev->input_lock);
        ret = __ov2722_set_exposure(sd, exposure, gain, digitgain);
        mutex_unlock(&dev->input_lock);

        return ret;
}

static long ov2722_s_exposure(struct v4l2_subdev *sd,
                              struct atomisp_exposure *exposure)
{
        int exp = exposure->integration_time[0];
        int gain = exposure->gain[0];
        int digitgain = exposure->gain[1];

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

                v4l2_err(client, "%s: invalid value\n", __func__);
                return -EINVAL;
        }

        return ov2722_set_exposure(sd, exp, gain, digitgain);
}

static long ov2722_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
{
        switch (cmd) {
        case ATOMISP_IOC_S_EXPOSURE:
                return ov2722_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 ov2722_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 = ov2722_read_reg(client, OV2722_8BIT,
                              OV2722_AEC_PK_EXPO_L,
                              &reg_v);
        if (ret)
                goto err;

        ret = ov2722_read_reg(client, OV2722_8BIT,
                              OV2722_AEC_PK_EXPO_M,
                              &reg_v2);
        if (ret)
                goto err;

        reg_v += reg_v2 << 8;
        ret = ov2722_read_reg(client, OV2722_8BIT,
                              OV2722_AEC_PK_EXPO_H,
                              &reg_v2);
        if (ret)
                goto err;

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

static int ov2722_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
{
        struct ov2722_device *dev =
            container_of(ctrl->handler, struct ov2722_device, ctrl_handler);
        int ret = 0;
        unsigned int val;

        switch (ctrl->id) {
        case V4L2_CID_EXPOSURE_ABSOLUTE:
                ret = ov2722_q_exposure(&dev->sd, &ctrl->val);
                break;
        case V4L2_CID_LINK_FREQ:
                val = dev->res->mipi_freq;
                if (val == 0)
                        return -EINVAL;

                ctrl->val = val * 1000; /* To Hz */
                break;
        default:
                ret = -EINVAL;
        }

        return ret;
}

static const struct v4l2_ctrl_ops ctrl_ops = {
        .g_volatile_ctrl = ov2722_g_volatile_ctrl
};

static const struct v4l2_ctrl_config ov2722_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_LINK_FREQ,
                .name = "Link Frequency",
                .type = V4L2_CTRL_TYPE_INTEGER,
                .min = 1,
                .max = 1500000 * 1000,
                .step = 1,
                .def = 1,
                .flags = V4L2_CTRL_FLAG_VOLATILE | V4L2_CTRL_FLAG_READ_ONLY,
        },
};

static int ov2722_init(struct v4l2_subdev *sd)
{
        struct ov2722_device *dev = to_ov2722_sensor(sd);

        mutex_lock(&dev->input_lock);

        /* restore settings */
        ov2722_res = ov2722_res_preview;
        N_RES = N_RES_PREVIEW;

        mutex_unlock(&dev->input_lock);

        return 0;
}

static int power_ctrl(struct v4l2_subdev *sd, bool flag)
{
        int ret = -1;
        struct ov2722_device *dev = to_ov2722_sensor(sd);

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

        if (flag) {
                ret = dev->platform_data->v1p8_ctrl(sd, 1);
                if (ret == 0) {
                        ret = dev->platform_data->v2p8_ctrl(sd, 1);
                        if (ret)
                                dev->platform_data->v1p8_ctrl(sd, 0);
                }
        } else {
                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 ov2722_device *dev = to_ov2722_sensor(sd);
        int ret = -1;

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

        /* Note: the GPIO order is asymmetric: always RESET#
         * before PWDN# when turning it on or off.
         */
        ret = dev->platform_data->gpio0_ctrl(sd, flag);
        ret |= dev->platform_data->gpio1_ctrl(sd, flag);
        return ret;
}

static int power_up(struct v4l2_subdev *sd)
{
        struct ov2722_device *dev = to_ov2722_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, 0);
                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 ov2722_device *dev = to_ov2722_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret = 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 ov2722_s_power(struct v4l2_subdev *sd, int on)
{
        int ret;

        if (on == 0)
                return power_down(sd);

        ret = power_up(sd);
        if (!ret)
                return ov2722_init(sd);

        return ret;
}

/* TODO: remove it. */
static int ov2722_startup(struct v4l2_subdev *sd)
{
        struct ov2722_device *dev = to_ov2722_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret = 0;

        ret = ov2722_write_reg(client, OV2722_8BIT,
                               OV2722_SW_RESET, 0x01);
        if (ret) {
                dev_err(&client->dev, "ov2722 reset err.\n");
                return ret;
        }

        ret = ov2722_write_reg_array(client, dev->res->regs);
        if (ret) {
                dev_err(&client->dev, "ov2722 write register err.\n");
                return ret;
        }

        return ret;
}

static int ov2722_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 ov2722_device *dev = to_ov2722_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        struct ov2722_resolution *res;
        struct camera_mipi_info *ov2722_info = NULL;
        int ret = 0;

        if (format->pad)
                return -EINVAL;
        if (!fmt)
                return -EINVAL;
        ov2722_info = v4l2_get_subdev_hostdata(sd);
        if (!ov2722_info)
                return -EINVAL;

        res = v4l2_find_nearest_size(ov2722_res_preview,
                                     ARRAY_SIZE(ov2722_res_preview), width,
                                     height, fmt->width, fmt->height);
        if (!res)
                res = &ov2722_res_preview[N_RES - 1];

        fmt->width = res->width;
        fmt->height = res->height;
        dev->res = res;

        fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;
        if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
                *v4l2_subdev_state_get_format(sd_state, 0) = *fmt;
                return 0;
        }

        mutex_lock(&dev->input_lock);

        dev->pixels_per_line = dev->res->pixels_per_line;
        dev->lines_per_frame = dev->res->lines_per_frame;

        ret = ov2722_startup(sd);
        if (ret) {
                int i = 0;

                dev_err(&client->dev, "ov2722 startup err, retry to power up\n");
                for (i = 0; i < OV2722_POWER_UP_RETRY_NUM; i++) {
                        dev_err(&client->dev,
                                "ov2722 retry to power up %d/%d times, result: ",
                                i + 1, OV2722_POWER_UP_RETRY_NUM);
                        power_down(sd);
                        ret = power_up(sd);
                        if (ret) {
                                dev_err(&client->dev, "power up failed, continue\n");
                                continue;
                        }
                        ret = ov2722_startup(sd);
                        if (ret) {
                                dev_err(&client->dev, " startup FAILED!\n");
                        } else {
                                dev_err(&client->dev, " startup SUCCESS!\n");
                                break;
                        }
                }
                if (ret) {
                        dev_err(&client->dev, "ov2722 startup err\n");
                        goto err;
                }
        }

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

static int ov2722_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 ov2722_device *dev = to_ov2722_sensor(sd);

        if (format->pad)
                return -EINVAL;
        if (!fmt)
                return -EINVAL;

        fmt->width = dev->res->width;
        fmt->height = dev->res->height;
        fmt->code = MEDIA_BUS_FMT_SBGGR10_1X10;

        return 0;
}

static int ov2722_detect(struct i2c_client *client)
{
        struct i2c_adapter *adapter = client->adapter;
        u16 high = 0, low = 0;
        u16 id;
        u8 revision;

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

        ov2722_read_reg(client, OV2722_8BIT,
                        OV2722_SC_CMMN_CHIP_ID_H, &high);
        ov2722_read_reg(client, OV2722_8BIT,
                        OV2722_SC_CMMN_CHIP_ID_L, &low);
        id = (high << 8) | low;

        if ((id != OV2722_ID) && (id != OV2720_ID)) {
                dev_err(&client->dev, "sensor ID error\n");
                return -ENODEV;
        }

        high = 0;
        ov2722_read_reg(client, OV2722_8BIT,
                        OV2722_SC_CMMN_SUB_ID, &high);
        revision = (u8)high & 0x0f;

        dev_dbg(&client->dev, "sensor_revision = 0x%x\n", revision);
        dev_dbg(&client->dev, "detect ov2722 success\n");
        return 0;
}

static int ov2722_s_stream(struct v4l2_subdev *sd, int enable)
{
        struct ov2722_device *dev = to_ov2722_sensor(sd);
        struct i2c_client *client = v4l2_get_subdevdata(sd);
        int ret;

        mutex_lock(&dev->input_lock);

        ret = ov2722_write_reg(client, OV2722_8BIT, OV2722_SW_STREAM,
                               enable ? OV2722_START_STREAMING :
                               OV2722_STOP_STREAMING);

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

static int ov2722_s_config(struct v4l2_subdev *sd,
                           int irq, void *platform_data)
{
        struct ov2722_device *dev = to_ov2722_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, "ov2722 power-off err.\n");
                goto fail_power_off;
        }

        ret = power_up(sd);
        if (ret) {
                dev_err(&client->dev, "ov2722 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 = ov2722_detect(client);
        if (ret) {
                dev_err(&client->dev, "ov2722_detect err s_config.\n");
                goto fail_csi_cfg;
        }

        /* turn off sensor, after probed */
        ret = power_down(sd);
        if (ret) {
                dev_err(&client->dev, "ov2722 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 ov2722_get_frame_interval(struct v4l2_subdev *sd,
                                     struct v4l2_subdev_state *sd_state,
                                     struct v4l2_subdev_frame_interval *interval)
{
        struct ov2722_device *dev = to_ov2722_sensor(sd);

        /*
         * FIXME: Implement support for V4L2_SUBDEV_FORMAT_TRY, using the V4L2
         * subdev active state API.
         */
        if (interval->which != V4L2_SUBDEV_FORMAT_ACTIVE)
                return -EINVAL;

        interval->interval.numerator = 1;
        interval->interval.denominator = dev->res->fps;

        return 0;
}

static int ov2722_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 ov2722_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 = ov2722_res[index].width;
        fse->min_height = ov2722_res[index].height;
        fse->max_width = ov2722_res[index].width;
        fse->max_height = ov2722_res[index].height;

        return 0;
}

static int ov2722_g_skip_frames(struct v4l2_subdev *sd, u32 *frames)
{
        struct ov2722_device *dev = to_ov2722_sensor(sd);

        mutex_lock(&dev->input_lock);
        *frames = dev->res->skip_frames;
        mutex_unlock(&dev->input_lock);

        return 0;
}

static const struct v4l2_subdev_sensor_ops ov2722_sensor_ops = {
        .g_skip_frames  = ov2722_g_skip_frames,
};

static const struct v4l2_subdev_video_ops ov2722_video_ops = {
        .s_stream = ov2722_s_stream,
};

static const struct v4l2_subdev_core_ops ov2722_core_ops = {
        .s_power = ov2722_s_power,
        .ioctl = ov2722_ioctl,
};

static const struct v4l2_subdev_pad_ops ov2722_pad_ops = {
        .enum_mbus_code = ov2722_enum_mbus_code,
        .enum_frame_size = ov2722_enum_frame_size,
        .get_fmt = ov2722_get_fmt,
        .set_fmt = ov2722_set_fmt,
        .get_frame_interval = ov2722_get_frame_interval,
};

static const struct v4l2_subdev_ops ov2722_ops = {
        .core = &ov2722_core_ops,
        .video = &ov2722_video_ops,
        .pad = &ov2722_pad_ops,
        .sensor = &ov2722_sensor_ops,
};

static void ov2722_remove(struct i2c_client *client)
{
        struct v4l2_subdev *sd = i2c_get_clientdata(client);
        struct ov2722_device *dev = to_ov2722_sensor(sd);

        dev->platform_data->csi_cfg(sd, 0);
        v4l2_ctrl_handler_free(&dev->ctrl_handler);
        v4l2_device_unregister_subdev(sd);

        atomisp_gmin_remove_subdev(sd);

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

static int __ov2722_init_ctrl_handler(struct ov2722_device *dev)
{
        struct v4l2_ctrl_handler *hdl;
        unsigned int i;

        hdl = &dev->ctrl_handler;
        v4l2_ctrl_handler_init(&dev->ctrl_handler, ARRAY_SIZE(ov2722_controls));
        for (i = 0; i < ARRAY_SIZE(ov2722_controls); i++)
                v4l2_ctrl_new_custom(&dev->ctrl_handler, &ov2722_controls[i],
                                     NULL);

        dev->link_freq = v4l2_ctrl_find(&dev->ctrl_handler, V4L2_CID_LINK_FREQ);

        if (dev->ctrl_handler.error || !dev->link_freq)
                return dev->ctrl_handler.error;

        dev->sd.ctrl_handler = hdl;

        return 0;
}

static int ov2722_probe(struct i2c_client *client)
{
        struct ov2722_device *dev;
        void *ovpdev;
        int ret;

        dev = kzalloc_obj(*dev);
        if (!dev)
                return -ENOMEM;

        mutex_init(&dev->input_lock);

        dev->res = &ov2722_res_preview[0];
        v4l2_i2c_subdev_init(&dev->sd, client, &ov2722_ops);

        ovpdev = gmin_camera_platform_data(&dev->sd,
                                           ATOMISP_INPUT_FORMAT_RAW_10,
                                           atomisp_bayer_order_grbg);

        ret = ov2722_s_config(&dev->sd, client->irq, ovpdev);
        if (ret)
                goto out_free;

        ret = __ov2722_init_ctrl_handler(dev);
        if (ret)
                goto out_ctrl_handler_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 = media_entity_pads_init(&dev->sd.entity, 1, &dev->pad);
        if (ret)
                ov2722_remove(client);

        return atomisp_register_i2c_module(&dev->sd, ovpdev);

out_ctrl_handler_free:
        v4l2_ctrl_handler_free(&dev->ctrl_handler);

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

static const struct acpi_device_id ov2722_acpi_match[] = {
        { "INT33FB" },
        {},
};
MODULE_DEVICE_TABLE(acpi, ov2722_acpi_match);

static struct i2c_driver ov2722_driver = {
        .driver = {
                .name = "ov2722",
                .acpi_match_table = ov2722_acpi_match,
        },
        .probe = ov2722_probe,
        .remove = ov2722_remove,
};
module_i2c_driver(ov2722_driver);

MODULE_AUTHOR("Wei Liu <wei.liu@intel.com>");
MODULE_DESCRIPTION("A low-level driver for OmniVision 2722 sensors");
MODULE_LICENSE("GPL");